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->derived->attr.abstract)
111 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
112 name, where, ts->derived->name);
114 gfc_error ("ABSTRACT type '%s' used at %L",
115 ts->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.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 are not on that list;
371 ergo, not permitted. */
373 if (sym->result->ts.type == BT_CHARACTER)
375 gfc_charlen *cl = sym->result->ts.cl;
376 if (!cl || !cl->length)
377 gfc_error ("Character-valued internal function '%s' at %L must "
378 "not be assumed length", sym->name, &sym->declared_at);
383 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
384 introduce duplicates. */
387 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
389 gfc_formal_arglist *f, *new_arglist;
392 for (; new_args != NULL; new_args = new_args->next)
394 new_sym = new_args->sym;
395 /* See if this arg is already in the formal argument list. */
396 for (f = proc->formal; f; f = f->next)
398 if (new_sym == f->sym)
405 /* Add a new argument. Argument order is not important. */
406 new_arglist = gfc_get_formal_arglist ();
407 new_arglist->sym = new_sym;
408 new_arglist->next = proc->formal;
409 proc->formal = new_arglist;
414 /* Flag the arguments that are not present in all entries. */
417 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
419 gfc_formal_arglist *f, *head;
422 for (f = proc->formal; f; f = f->next)
427 for (new_args = head; new_args; new_args = new_args->next)
429 if (new_args->sym == f->sym)
436 f->sym->attr.not_always_present = 1;
441 /* Resolve alternate entry points. If a symbol has multiple entry points we
442 create a new master symbol for the main routine, and turn the existing
443 symbol into an entry point. */
446 resolve_entries (gfc_namespace *ns)
448 gfc_namespace *old_ns;
452 char name[GFC_MAX_SYMBOL_LEN + 1];
453 static int master_count = 0;
455 if (ns->proc_name == NULL)
458 /* No need to do anything if this procedure doesn't have alternate entry
463 /* We may already have resolved alternate entry points. */
464 if (ns->proc_name->attr.entry_master)
467 /* If this isn't a procedure something has gone horribly wrong. */
468 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
470 /* Remember the current namespace. */
471 old_ns = gfc_current_ns;
475 /* Add the main entry point to the list of entry points. */
476 el = gfc_get_entry_list ();
477 el->sym = ns->proc_name;
479 el->next = ns->entries;
481 ns->proc_name->attr.entry = 1;
483 /* If it is a module function, it needs to be in the right namespace
484 so that gfc_get_fake_result_decl can gather up the results. The
485 need for this arose in get_proc_name, where these beasts were
486 left in their own namespace, to keep prior references linked to
487 the entry declaration.*/
488 if (ns->proc_name->attr.function
489 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
492 /* Do the same for entries where the master is not a module
493 procedure. These are retained in the module namespace because
494 of the module procedure declaration. */
495 for (el = el->next; el; el = el->next)
496 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
497 && el->sym->attr.mod_proc)
501 /* Add an entry statement for it. */
508 /* Create a new symbol for the master function. */
509 /* Give the internal function a unique name (within this file).
510 Also include the function name so the user has some hope of figuring
511 out what is going on. */
512 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
513 master_count++, ns->proc_name->name);
514 gfc_get_ha_symbol (name, &proc);
515 gcc_assert (proc != NULL);
517 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
518 if (ns->proc_name->attr.subroutine)
519 gfc_add_subroutine (&proc->attr, proc->name, NULL);
523 gfc_typespec *ts, *fts;
524 gfc_array_spec *as, *fas;
525 gfc_add_function (&proc->attr, proc->name, NULL);
527 fas = ns->entries->sym->as;
528 fas = fas ? fas : ns->entries->sym->result->as;
529 fts = &ns->entries->sym->result->ts;
530 if (fts->type == BT_UNKNOWN)
531 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
532 for (el = ns->entries->next; el; el = el->next)
534 ts = &el->sym->result->ts;
536 as = as ? as : el->sym->result->as;
537 if (ts->type == BT_UNKNOWN)
538 ts = gfc_get_default_type (el->sym->result->name, NULL);
540 if (! gfc_compare_types (ts, fts)
541 || (el->sym->result->attr.dimension
542 != ns->entries->sym->result->attr.dimension)
543 || (el->sym->result->attr.pointer
544 != ns->entries->sym->result->attr.pointer))
546 else if (as && fas && ns->entries->sym->result != el->sym->result
547 && gfc_compare_array_spec (as, fas) == 0)
548 gfc_error ("Function %s at %L has entries with mismatched "
549 "array specifications", ns->entries->sym->name,
550 &ns->entries->sym->declared_at);
551 /* The characteristics need to match and thus both need to have
552 the same string length, i.e. both len=*, or both len=4.
553 Having both len=<variable> is also possible, but difficult to
554 check at compile time. */
555 else if (ts->type == BT_CHARACTER && ts->cl && fts->cl
556 && (((ts->cl->length && !fts->cl->length)
557 ||(!ts->cl->length && fts->cl->length))
559 && ts->cl->length->expr_type
560 != fts->cl->length->expr_type)
562 && ts->cl->length->expr_type == EXPR_CONSTANT
563 && mpz_cmp (ts->cl->length->value.integer,
564 fts->cl->length->value.integer) != 0)))
565 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
566 "entries returning variables of different "
567 "string lengths", ns->entries->sym->name,
568 &ns->entries->sym->declared_at);
573 sym = ns->entries->sym->result;
574 /* All result types the same. */
576 if (sym->attr.dimension)
577 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
578 if (sym->attr.pointer)
579 gfc_add_pointer (&proc->attr, NULL);
583 /* Otherwise the result will be passed through a union by
585 proc->attr.mixed_entry_master = 1;
586 for (el = ns->entries; el; el = el->next)
588 sym = el->sym->result;
589 if (sym->attr.dimension)
591 if (el == ns->entries)
592 gfc_error ("FUNCTION result %s can't be an array in "
593 "FUNCTION %s at %L", sym->name,
594 ns->entries->sym->name, &sym->declared_at);
596 gfc_error ("ENTRY result %s can't be an array in "
597 "FUNCTION %s at %L", sym->name,
598 ns->entries->sym->name, &sym->declared_at);
600 else if (sym->attr.pointer)
602 if (el == ns->entries)
603 gfc_error ("FUNCTION result %s can't be a POINTER 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 a POINTER in "
608 "FUNCTION %s at %L", sym->name,
609 ns->entries->sym->name, &sym->declared_at);
614 if (ts->type == BT_UNKNOWN)
615 ts = gfc_get_default_type (sym->name, NULL);
619 if (ts->kind == gfc_default_integer_kind)
623 if (ts->kind == gfc_default_real_kind
624 || ts->kind == gfc_default_double_kind)
628 if (ts->kind == gfc_default_complex_kind)
632 if (ts->kind == gfc_default_logical_kind)
636 /* We will issue error elsewhere. */
644 if (el == ns->entries)
645 gfc_error ("FUNCTION result %s can't be of type %s "
646 "in FUNCTION %s at %L", sym->name,
647 gfc_typename (ts), ns->entries->sym->name,
650 gfc_error ("ENTRY result %s can't be of type %s "
651 "in FUNCTION %s at %L", sym->name,
652 gfc_typename (ts), ns->entries->sym->name,
659 proc->attr.access = ACCESS_PRIVATE;
660 proc->attr.entry_master = 1;
662 /* Merge all the entry point arguments. */
663 for (el = ns->entries; el; el = el->next)
664 merge_argument_lists (proc, el->sym->formal);
666 /* Check the master formal arguments for any that are not
667 present in all entry points. */
668 for (el = ns->entries; el; el = el->next)
669 check_argument_lists (proc, el->sym->formal);
671 /* Use the master function for the function body. */
672 ns->proc_name = proc;
674 /* Finalize the new symbols. */
675 gfc_commit_symbols ();
677 /* Restore the original namespace. */
678 gfc_current_ns = old_ns;
683 has_default_initializer (gfc_symbol *der)
687 gcc_assert (der->attr.flavor == FL_DERIVED);
688 for (c = der->components; c; c = c->next)
689 if ((c->ts.type != BT_DERIVED && c->initializer)
690 || (c->ts.type == BT_DERIVED
691 && (!c->attr.pointer && has_default_initializer (c->ts.derived))))
697 /* Resolve common variables. */
699 resolve_common_vars (gfc_symbol *sym, bool named_common)
701 gfc_symbol *csym = sym;
703 for (; csym; csym = csym->common_next)
705 if (csym->value || csym->attr.data)
707 if (!csym->ns->is_block_data)
708 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
709 "but only in BLOCK DATA initialization is "
710 "allowed", csym->name, &csym->declared_at);
711 else if (!named_common)
712 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
713 "in a blank COMMON but initialization is only "
714 "allowed in named common blocks", csym->name,
718 if (csym->ts.type != BT_DERIVED)
721 if (!(csym->ts.derived->attr.sequence
722 || csym->ts.derived->attr.is_bind_c))
723 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
724 "has neither the SEQUENCE nor the BIND(C) "
725 "attribute", csym->name, &csym->declared_at);
726 if (csym->ts.derived->attr.alloc_comp)
727 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
728 "has an ultimate component that is "
729 "allocatable", csym->name, &csym->declared_at);
730 if (has_default_initializer (csym->ts.derived))
731 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
732 "may not have default initializer", csym->name,
735 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
736 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
740 /* Resolve common blocks. */
742 resolve_common_blocks (gfc_symtree *common_root)
746 if (common_root == NULL)
749 if (common_root->left)
750 resolve_common_blocks (common_root->left);
751 if (common_root->right)
752 resolve_common_blocks (common_root->right);
754 resolve_common_vars (common_root->n.common->head, true);
756 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
760 if (sym->attr.flavor == FL_PARAMETER)
761 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
762 sym->name, &common_root->n.common->where, &sym->declared_at);
764 if (sym->attr.intrinsic)
765 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
766 sym->name, &common_root->n.common->where);
767 else if (sym->attr.result
768 ||(sym->attr.function && gfc_current_ns->proc_name == sym))
769 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
770 "that is also a function result", sym->name,
771 &common_root->n.common->where);
772 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
773 && sym->attr.proc != PROC_ST_FUNCTION)
774 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
775 "that is also a global procedure", sym->name,
776 &common_root->n.common->where);
780 /* Resolve contained function types. Because contained functions can call one
781 another, they have to be worked out before any of the contained procedures
784 The good news is that if a function doesn't already have a type, the only
785 way it can get one is through an IMPLICIT type or a RESULT variable, because
786 by definition contained functions are contained namespace they're contained
787 in, not in a sibling or parent namespace. */
790 resolve_contained_functions (gfc_namespace *ns)
792 gfc_namespace *child;
795 resolve_formal_arglists (ns);
797 for (child = ns->contained; child; child = child->sibling)
799 /* Resolve alternate entry points first. */
800 resolve_entries (child);
802 /* Then check function return types. */
803 resolve_contained_fntype (child->proc_name, child);
804 for (el = child->entries; el; el = el->next)
805 resolve_contained_fntype (el->sym, child);
810 /* Resolve all of the elements of a structure constructor and make sure that
811 the types are correct. */
814 resolve_structure_cons (gfc_expr *expr)
816 gfc_constructor *cons;
822 cons = expr->value.constructor;
823 /* A constructor may have references if it is the result of substituting a
824 parameter variable. In this case we just pull out the component we
827 comp = expr->ref->u.c.sym->components;
829 comp = expr->ts.derived->components;
831 /* See if the user is trying to invoke a structure constructor for one of
832 the iso_c_binding derived types. */
833 if (expr->ts.derived && expr->ts.derived->ts.is_iso_c && cons
834 && cons->expr != NULL)
836 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
837 expr->ts.derived->name, &(expr->where));
841 for (; comp; comp = comp->next, cons = cons->next)
848 if (gfc_resolve_expr (cons->expr) == FAILURE)
854 rank = comp->as ? comp->as->rank : 0;
855 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
856 && (comp->attr.allocatable || cons->expr->rank))
858 gfc_error ("The rank of the element in the derived type "
859 "constructor at %L does not match that of the "
860 "component (%d/%d)", &cons->expr->where,
861 cons->expr->rank, rank);
865 /* If we don't have the right type, try to convert it. */
867 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
870 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
871 gfc_error ("The element in the derived type constructor at %L, "
872 "for pointer component '%s', is %s but should be %s",
873 &cons->expr->where, comp->name,
874 gfc_basic_typename (cons->expr->ts.type),
875 gfc_basic_typename (comp->ts.type));
877 t = gfc_convert_type (cons->expr, &comp->ts, 1);
880 if (cons->expr->expr_type == EXPR_NULL
881 && !(comp->attr.pointer || comp->attr.allocatable
882 || comp->attr.proc_pointer))
885 gfc_error ("The NULL in the derived type constructor at %L is "
886 "being applied to component '%s', which is neither "
887 "a POINTER nor ALLOCATABLE", &cons->expr->where,
891 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
894 a = gfc_expr_attr (cons->expr);
896 if (!a.pointer && !a.target)
899 gfc_error ("The element in the derived type constructor at %L, "
900 "for pointer component '%s' should be a POINTER or "
901 "a TARGET", &cons->expr->where, comp->name);
909 /****************** Expression name resolution ******************/
911 /* Returns 0 if a symbol was not declared with a type or
912 attribute declaration statement, nonzero otherwise. */
915 was_declared (gfc_symbol *sym)
921 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
924 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
925 || a.optional || a.pointer || a.save || a.target || a.volatile_
926 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN)
933 /* Determine if a symbol is generic or not. */
936 generic_sym (gfc_symbol *sym)
940 if (sym->attr.generic ||
941 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
944 if (was_declared (sym) || sym->ns->parent == NULL)
947 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
954 return generic_sym (s);
961 /* Determine if a symbol is specific or not. */
964 specific_sym (gfc_symbol *sym)
968 if (sym->attr.if_source == IFSRC_IFBODY
969 || sym->attr.proc == PROC_MODULE
970 || sym->attr.proc == PROC_INTERNAL
971 || sym->attr.proc == PROC_ST_FUNCTION
972 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
973 || sym->attr.external)
976 if (was_declared (sym) || sym->ns->parent == NULL)
979 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
981 return (s == NULL) ? 0 : specific_sym (s);
985 /* Figure out if the procedure is specific, generic or unknown. */
988 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
992 procedure_kind (gfc_symbol *sym)
994 if (generic_sym (sym))
995 return PTYPE_GENERIC;
997 if (specific_sym (sym))
998 return PTYPE_SPECIFIC;
1000 return PTYPE_UNKNOWN;
1003 /* Check references to assumed size arrays. The flag need_full_assumed_size
1004 is nonzero when matching actual arguments. */
1006 static int need_full_assumed_size = 0;
1009 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1011 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1014 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1015 What should it be? */
1016 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1017 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1018 && (e->ref->u.ar.type == AR_FULL))
1020 gfc_error ("The upper bound in the last dimension must "
1021 "appear in the reference to the assumed size "
1022 "array '%s' at %L", sym->name, &e->where);
1029 /* Look for bad assumed size array references in argument expressions
1030 of elemental and array valued intrinsic procedures. Since this is
1031 called from procedure resolution functions, it only recurses at
1035 resolve_assumed_size_actual (gfc_expr *e)
1040 switch (e->expr_type)
1043 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1048 if (resolve_assumed_size_actual (e->value.op.op1)
1049 || resolve_assumed_size_actual (e->value.op.op2))
1060 /* Check a generic procedure, passed as an actual argument, to see if
1061 there is a matching specific name. If none, it is an error, and if
1062 more than one, the reference is ambiguous. */
1064 count_specific_procs (gfc_expr *e)
1071 sym = e->symtree->n.sym;
1073 for (p = sym->generic; p; p = p->next)
1074 if (strcmp (sym->name, p->sym->name) == 0)
1076 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1082 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1086 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1087 "argument at %L", sym->name, &e->where);
1093 /* See if a call to sym could possibly be a not allowed RECURSION because of
1094 a missing RECURIVE declaration. This means that either sym is the current
1095 context itself, or sym is the parent of a contained procedure calling its
1096 non-RECURSIVE containing procedure.
1097 This also works if sym is an ENTRY. */
1100 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1102 gfc_symbol* proc_sym;
1103 gfc_symbol* context_proc;
1105 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1107 /* If we've got an ENTRY, find real procedure. */
1108 if (sym->attr.entry && sym->ns->entries)
1109 proc_sym = sym->ns->entries->sym;
1113 /* If sym is RECURSIVE, all is well of course. */
1114 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1117 /* Find the context procdure's "real" symbol if it has entries. */
1118 context_proc = (context->entries ? context->entries->sym
1119 : context->proc_name);
1123 /* A call from sym's body to itself is recursion, of course. */
1124 if (context_proc == proc_sym)
1127 /* The same is true if context is a contained procedure and sym the
1129 if (context_proc->attr.contained)
1131 gfc_symbol* parent_proc;
1133 gcc_assert (context->parent);
1134 parent_proc = (context->parent->entries ? context->parent->entries->sym
1135 : context->parent->proc_name);
1137 if (parent_proc == proc_sym)
1145 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1146 its typespec and formal argument list. */
1149 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1151 gfc_intrinsic_sym *isym = gfc_find_function (sym->name);
1154 if (!sym->attr.function &&
1155 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1161 isym = gfc_find_subroutine (sym->name);
1163 if (!sym->attr.subroutine &&
1164 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1168 gfc_copy_formal_args_intr (sym, isym);
1173 /* Resolve a procedure expression, like passing it to a called procedure or as
1174 RHS for a procedure pointer assignment. */
1177 resolve_procedure_expression (gfc_expr* expr)
1181 if (expr->expr_type != EXPR_VARIABLE)
1183 gcc_assert (expr->symtree);
1185 sym = expr->symtree->n.sym;
1187 if (sym->attr.intrinsic)
1188 resolve_intrinsic (sym, &expr->where);
1190 if (sym->attr.flavor != FL_PROCEDURE
1191 || (sym->attr.function && sym->result == sym))
1194 /* A non-RECURSIVE procedure that is used as procedure expression within its
1195 own body is in danger of being called recursively. */
1196 if (is_illegal_recursion (sym, gfc_current_ns))
1197 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1198 " itself recursively. Declare it RECURSIVE or use"
1199 " -frecursive", sym->name, &expr->where);
1205 /* Resolve an actual argument list. Most of the time, this is just
1206 resolving the expressions in the list.
1207 The exception is that we sometimes have to decide whether arguments
1208 that look like procedure arguments are really simple variable
1212 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1213 bool no_formal_args)
1216 gfc_symtree *parent_st;
1218 int save_need_full_assumed_size;
1219 gfc_component *comp;
1221 for (; arg; arg = arg->next)
1226 /* Check the label is a valid branching target. */
1229 if (arg->label->defined == ST_LABEL_UNKNOWN)
1231 gfc_error ("Label %d referenced at %L is never defined",
1232 arg->label->value, &arg->label->where);
1239 if (is_proc_ptr_comp (e, &comp))
1242 e->expr_type = EXPR_VARIABLE;
1246 if (e->expr_type == EXPR_VARIABLE
1247 && e->symtree->n.sym->attr.generic
1249 && count_specific_procs (e) != 1)
1252 if (e->ts.type != BT_PROCEDURE)
1254 save_need_full_assumed_size = need_full_assumed_size;
1255 if (e->expr_type != EXPR_VARIABLE)
1256 need_full_assumed_size = 0;
1257 if (gfc_resolve_expr (e) != SUCCESS)
1259 need_full_assumed_size = save_need_full_assumed_size;
1263 /* See if the expression node should really be a variable reference. */
1265 sym = e->symtree->n.sym;
1267 if (sym->attr.flavor == FL_PROCEDURE
1268 || sym->attr.intrinsic
1269 || sym->attr.external)
1273 /* If a procedure is not already determined to be something else
1274 check if it is intrinsic. */
1275 if (!sym->attr.intrinsic
1276 && !(sym->attr.external || sym->attr.use_assoc
1277 || sym->attr.if_source == IFSRC_IFBODY)
1278 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1279 sym->attr.intrinsic = 1;
1281 if (sym->attr.proc == PROC_ST_FUNCTION)
1283 gfc_error ("Statement function '%s' at %L is not allowed as an "
1284 "actual argument", sym->name, &e->where);
1287 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1288 sym->attr.subroutine);
1289 if (sym->attr.intrinsic && actual_ok == 0)
1291 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1292 "actual argument", sym->name, &e->where);
1295 if (sym->attr.contained && !sym->attr.use_assoc
1296 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1298 gfc_error ("Internal procedure '%s' is not allowed as an "
1299 "actual argument at %L", sym->name, &e->where);
1302 if (sym->attr.elemental && !sym->attr.intrinsic)
1304 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1305 "allowed as an actual argument at %L", sym->name,
1309 /* Check if a generic interface has a specific procedure
1310 with the same name before emitting an error. */
1311 if (sym->attr.generic && count_specific_procs (e) != 1)
1314 /* Just in case a specific was found for the expression. */
1315 sym = e->symtree->n.sym;
1317 /* If the symbol is the function that names the current (or
1318 parent) scope, then we really have a variable reference. */
1320 if (sym->attr.function && sym->result == sym
1321 && (sym->ns->proc_name == sym
1322 || (sym->ns->parent != NULL
1323 && sym->ns->parent->proc_name == sym)))
1326 /* If all else fails, see if we have a specific intrinsic. */
1327 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1329 gfc_intrinsic_sym *isym;
1331 isym = gfc_find_function (sym->name);
1332 if (isym == NULL || !isym->specific)
1334 gfc_error ("Unable to find a specific INTRINSIC procedure "
1335 "for the reference '%s' at %L", sym->name,
1340 sym->attr.intrinsic = 1;
1341 sym->attr.function = 1;
1344 if (gfc_resolve_expr (e) == FAILURE)
1349 /* See if the name is a module procedure in a parent unit. */
1351 if (was_declared (sym) || sym->ns->parent == NULL)
1354 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1356 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1360 if (parent_st == NULL)
1363 sym = parent_st->n.sym;
1364 e->symtree = parent_st; /* Point to the right thing. */
1366 if (sym->attr.flavor == FL_PROCEDURE
1367 || sym->attr.intrinsic
1368 || sym->attr.external)
1370 if (gfc_resolve_expr (e) == FAILURE)
1376 e->expr_type = EXPR_VARIABLE;
1378 if (sym->as != NULL)
1380 e->rank = sym->as->rank;
1381 e->ref = gfc_get_ref ();
1382 e->ref->type = REF_ARRAY;
1383 e->ref->u.ar.type = AR_FULL;
1384 e->ref->u.ar.as = sym->as;
1387 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1388 primary.c (match_actual_arg). If above code determines that it
1389 is a variable instead, it needs to be resolved as it was not
1390 done at the beginning of this function. */
1391 save_need_full_assumed_size = need_full_assumed_size;
1392 if (e->expr_type != EXPR_VARIABLE)
1393 need_full_assumed_size = 0;
1394 if (gfc_resolve_expr (e) != SUCCESS)
1396 need_full_assumed_size = save_need_full_assumed_size;
1399 /* Check argument list functions %VAL, %LOC and %REF. There is
1400 nothing to do for %REF. */
1401 if (arg->name && arg->name[0] == '%')
1403 if (strncmp ("%VAL", arg->name, 4) == 0)
1405 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1407 gfc_error ("By-value argument at %L is not of numeric "
1414 gfc_error ("By-value argument at %L cannot be an array or "
1415 "an array section", &e->where);
1419 /* Intrinsics are still PROC_UNKNOWN here. However,
1420 since same file external procedures are not resolvable
1421 in gfortran, it is a good deal easier to leave them to
1423 if (ptype != PROC_UNKNOWN
1424 && ptype != PROC_DUMMY
1425 && ptype != PROC_EXTERNAL
1426 && ptype != PROC_MODULE)
1428 gfc_error ("By-value argument at %L is not allowed "
1429 "in this context", &e->where);
1434 /* Statement functions have already been excluded above. */
1435 else if (strncmp ("%LOC", arg->name, 4) == 0
1436 && e->ts.type == BT_PROCEDURE)
1438 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1440 gfc_error ("Passing internal procedure at %L by location "
1441 "not allowed", &e->where);
1452 /* Do the checks of the actual argument list that are specific to elemental
1453 procedures. If called with c == NULL, we have a function, otherwise if
1454 expr == NULL, we have a subroutine. */
1457 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1459 gfc_actual_arglist *arg0;
1460 gfc_actual_arglist *arg;
1461 gfc_symbol *esym = NULL;
1462 gfc_intrinsic_sym *isym = NULL;
1464 gfc_intrinsic_arg *iformal = NULL;
1465 gfc_formal_arglist *eformal = NULL;
1466 bool formal_optional = false;
1467 bool set_by_optional = false;
1471 /* Is this an elemental procedure? */
1472 if (expr && expr->value.function.actual != NULL)
1474 if (expr->value.function.esym != NULL
1475 && expr->value.function.esym->attr.elemental)
1477 arg0 = expr->value.function.actual;
1478 esym = expr->value.function.esym;
1480 else if (expr->value.function.isym != NULL
1481 && expr->value.function.isym->elemental)
1483 arg0 = expr->value.function.actual;
1484 isym = expr->value.function.isym;
1489 else if (c && c->ext.actual != NULL)
1491 arg0 = c->ext.actual;
1493 if (c->resolved_sym)
1494 esym = c->resolved_sym;
1496 esym = c->symtree->n.sym;
1499 if (!esym->attr.elemental)
1505 /* The rank of an elemental is the rank of its array argument(s). */
1506 for (arg = arg0; arg; arg = arg->next)
1508 if (arg->expr != NULL && arg->expr->rank > 0)
1510 rank = arg->expr->rank;
1511 if (arg->expr->expr_type == EXPR_VARIABLE
1512 && arg->expr->symtree->n.sym->attr.optional)
1513 set_by_optional = true;
1515 /* Function specific; set the result rank and shape. */
1519 if (!expr->shape && arg->expr->shape)
1521 expr->shape = gfc_get_shape (rank);
1522 for (i = 0; i < rank; i++)
1523 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1530 /* If it is an array, it shall not be supplied as an actual argument
1531 to an elemental procedure unless an array of the same rank is supplied
1532 as an actual argument corresponding to a nonoptional dummy argument of
1533 that elemental procedure(12.4.1.5). */
1534 formal_optional = false;
1536 iformal = isym->formal;
1538 eformal = esym->formal;
1540 for (arg = arg0; arg; arg = arg->next)
1544 if (eformal->sym && eformal->sym->attr.optional)
1545 formal_optional = true;
1546 eformal = eformal->next;
1548 else if (isym && iformal)
1550 if (iformal->optional)
1551 formal_optional = true;
1552 iformal = iformal->next;
1555 formal_optional = true;
1557 if (pedantic && arg->expr != NULL
1558 && arg->expr->expr_type == EXPR_VARIABLE
1559 && arg->expr->symtree->n.sym->attr.optional
1562 && (set_by_optional || arg->expr->rank != rank)
1563 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1565 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1566 "MISSING, it cannot be the actual argument of an "
1567 "ELEMENTAL procedure unless there is a non-optional "
1568 "argument with the same rank (12.4.1.5)",
1569 arg->expr->symtree->n.sym->name, &arg->expr->where);
1574 for (arg = arg0; arg; arg = arg->next)
1576 if (arg->expr == NULL || arg->expr->rank == 0)
1579 /* Being elemental, the last upper bound of an assumed size array
1580 argument must be present. */
1581 if (resolve_assumed_size_actual (arg->expr))
1584 /* Elemental procedure's array actual arguments must conform. */
1587 if (gfc_check_conformance (arg->expr, e,
1588 "elemental procedure") == FAILURE)
1595 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1596 is an array, the intent inout/out variable needs to be also an array. */
1597 if (rank > 0 && esym && expr == NULL)
1598 for (eformal = esym->formal, arg = arg0; arg && eformal;
1599 arg = arg->next, eformal = eformal->next)
1600 if ((eformal->sym->attr.intent == INTENT_OUT
1601 || eformal->sym->attr.intent == INTENT_INOUT)
1602 && arg->expr && arg->expr->rank == 0)
1604 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1605 "ELEMENTAL subroutine '%s' is a scalar, but another "
1606 "actual argument is an array", &arg->expr->where,
1607 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1608 : "INOUT", eformal->sym->name, esym->name);
1615 /* Go through each actual argument in ACTUAL and see if it can be
1616 implemented as an inlined, non-copying intrinsic. FNSYM is the
1617 function being called, or NULL if not known. */
1620 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1622 gfc_actual_arglist *ap;
1625 for (ap = actual; ap; ap = ap->next)
1627 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1628 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1630 ap->expr->inline_noncopying_intrinsic = 1;
1634 /* This function does the checking of references to global procedures
1635 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1636 77 and 95 standards. It checks for a gsymbol for the name, making
1637 one if it does not already exist. If it already exists, then the
1638 reference being resolved must correspond to the type of gsymbol.
1639 Otherwise, the new symbol is equipped with the attributes of the
1640 reference. The corresponding code that is called in creating
1641 global entities is parse.c.
1643 In addition, for all but -std=legacy, the gsymbols are used to
1644 check the interfaces of external procedures from the same file.
1645 The namespace of the gsymbol is resolved and then, once this is
1646 done the interface is checked. */
1649 resolve_global_procedure (gfc_symbol *sym, locus *where,
1650 gfc_actual_arglist **actual, int sub)
1654 enum gfc_symbol_type type;
1656 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1658 gsym = gfc_get_gsymbol (sym->name);
1660 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1661 gfc_global_used (gsym, where);
1663 if (gfc_option.flag_whole_file
1664 && gsym->type != GSYM_UNKNOWN
1666 && gsym->ns->proc_name)
1668 /* Make sure that translation for the gsymbol occurs before
1669 the procedure currently being resolved. */
1670 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1671 for (; ns && ns != gsym->ns; ns = ns->sibling)
1673 if (ns->sibling == gsym->ns)
1675 ns->sibling = gsym->ns->sibling;
1676 gsym->ns->sibling = gfc_global_ns_list;
1677 gfc_global_ns_list = gsym->ns;
1682 if (!gsym->ns->resolved)
1683 gfc_resolve (gsym->ns);
1685 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1688 if (gsym->type == GSYM_UNKNOWN)
1691 gsym->where = *where;
1698 /************* Function resolution *************/
1700 /* Resolve a function call known to be generic.
1701 Section 14.1.2.4.1. */
1704 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1708 if (sym->attr.generic)
1710 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1713 expr->value.function.name = s->name;
1714 expr->value.function.esym = s;
1716 if (s->ts.type != BT_UNKNOWN)
1718 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1719 expr->ts = s->result->ts;
1722 expr->rank = s->as->rank;
1723 else if (s->result != NULL && s->result->as != NULL)
1724 expr->rank = s->result->as->rank;
1726 gfc_set_sym_referenced (expr->value.function.esym);
1731 /* TODO: Need to search for elemental references in generic
1735 if (sym->attr.intrinsic)
1736 return gfc_intrinsic_func_interface (expr, 0);
1743 resolve_generic_f (gfc_expr *expr)
1748 sym = expr->symtree->n.sym;
1752 m = resolve_generic_f0 (expr, sym);
1755 else if (m == MATCH_ERROR)
1759 if (sym->ns->parent == NULL)
1761 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1765 if (!generic_sym (sym))
1769 /* Last ditch attempt. See if the reference is to an intrinsic
1770 that possesses a matching interface. 14.1.2.4 */
1771 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1773 gfc_error ("There is no specific function for the generic '%s' at %L",
1774 expr->symtree->n.sym->name, &expr->where);
1778 m = gfc_intrinsic_func_interface (expr, 0);
1782 gfc_error ("Generic function '%s' at %L is not consistent with a "
1783 "specific intrinsic interface", expr->symtree->n.sym->name,
1790 /* Resolve a function call known to be specific. */
1793 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1797 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1799 if (sym->attr.dummy)
1801 sym->attr.proc = PROC_DUMMY;
1805 sym->attr.proc = PROC_EXTERNAL;
1809 if (sym->attr.proc == PROC_MODULE
1810 || sym->attr.proc == PROC_ST_FUNCTION
1811 || sym->attr.proc == PROC_INTERNAL)
1814 if (sym->attr.intrinsic)
1816 m = gfc_intrinsic_func_interface (expr, 1);
1820 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1821 "with an intrinsic", sym->name, &expr->where);
1829 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1832 expr->value.function.name = sym->name;
1833 expr->value.function.esym = sym;
1834 if (sym->as != NULL)
1835 expr->rank = sym->as->rank;
1842 resolve_specific_f (gfc_expr *expr)
1847 sym = expr->symtree->n.sym;
1851 m = resolve_specific_f0 (sym, expr);
1854 if (m == MATCH_ERROR)
1857 if (sym->ns->parent == NULL)
1860 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1866 gfc_error ("Unable to resolve the specific function '%s' at %L",
1867 expr->symtree->n.sym->name, &expr->where);
1873 /* Resolve a procedure call not known to be generic nor specific. */
1876 resolve_unknown_f (gfc_expr *expr)
1881 sym = expr->symtree->n.sym;
1883 if (sym->attr.dummy)
1885 sym->attr.proc = PROC_DUMMY;
1886 expr->value.function.name = sym->name;
1890 /* See if we have an intrinsic function reference. */
1892 if (gfc_is_intrinsic (sym, 0, expr->where))
1894 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
1899 /* The reference is to an external name. */
1901 sym->attr.proc = PROC_EXTERNAL;
1902 expr->value.function.name = sym->name;
1903 expr->value.function.esym = expr->symtree->n.sym;
1905 if (sym->as != NULL)
1906 expr->rank = sym->as->rank;
1908 /* Type of the expression is either the type of the symbol or the
1909 default type of the symbol. */
1912 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1914 if (sym->ts.type != BT_UNKNOWN)
1918 ts = gfc_get_default_type (sym->name, sym->ns);
1920 if (ts->type == BT_UNKNOWN)
1922 gfc_error ("Function '%s' at %L has no IMPLICIT type",
1923 sym->name, &expr->where);
1934 /* Return true, if the symbol is an external procedure. */
1936 is_external_proc (gfc_symbol *sym)
1938 if (!sym->attr.dummy && !sym->attr.contained
1939 && !(sym->attr.intrinsic
1940 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
1941 && sym->attr.proc != PROC_ST_FUNCTION
1942 && !sym->attr.use_assoc
1950 /* Figure out if a function reference is pure or not. Also set the name
1951 of the function for a potential error message. Return nonzero if the
1952 function is PURE, zero if not. */
1954 pure_stmt_function (gfc_expr *, gfc_symbol *);
1957 pure_function (gfc_expr *e, const char **name)
1963 if (e->symtree != NULL
1964 && e->symtree->n.sym != NULL
1965 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
1966 return pure_stmt_function (e, e->symtree->n.sym);
1968 if (e->value.function.esym)
1970 pure = gfc_pure (e->value.function.esym);
1971 *name = e->value.function.esym->name;
1973 else if (e->value.function.isym)
1975 pure = e->value.function.isym->pure
1976 || e->value.function.isym->elemental;
1977 *name = e->value.function.isym->name;
1981 /* Implicit functions are not pure. */
1983 *name = e->value.function.name;
1991 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
1992 int *f ATTRIBUTE_UNUSED)
1996 /* Don't bother recursing into other statement functions
1997 since they will be checked individually for purity. */
1998 if (e->expr_type != EXPR_FUNCTION
2000 || e->symtree->n.sym == sym
2001 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2004 return pure_function (e, &name) ? false : true;
2009 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2011 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2016 is_scalar_expr_ptr (gfc_expr *expr)
2018 gfc_try retval = SUCCESS;
2023 /* See if we have a gfc_ref, which means we have a substring, array
2024 reference, or a component. */
2025 if (expr->ref != NULL)
2028 while (ref->next != NULL)
2034 if (ref->u.ss.length != NULL
2035 && ref->u.ss.length->length != NULL
2037 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2039 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2041 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2042 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2043 if (end - start + 1 != 1)
2050 if (ref->u.ar.type == AR_ELEMENT)
2052 else if (ref->u.ar.type == AR_FULL)
2054 /* The user can give a full array if the array is of size 1. */
2055 if (ref->u.ar.as != NULL
2056 && ref->u.ar.as->rank == 1
2057 && ref->u.ar.as->type == AS_EXPLICIT
2058 && ref->u.ar.as->lower[0] != NULL
2059 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2060 && ref->u.ar.as->upper[0] != NULL
2061 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2063 /* If we have a character string, we need to check if
2064 its length is one. */
2065 if (expr->ts.type == BT_CHARACTER)
2067 if (expr->ts.cl == NULL
2068 || expr->ts.cl->length == NULL
2069 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1)
2075 /* We have constant lower and upper bounds. If the
2076 difference between is 1, it can be considered a
2078 start = (int) mpz_get_si
2079 (ref->u.ar.as->lower[0]->value.integer);
2080 end = (int) mpz_get_si
2081 (ref->u.ar.as->upper[0]->value.integer);
2082 if (end - start + 1 != 1)
2097 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2099 /* Character string. Make sure it's of length 1. */
2100 if (expr->ts.cl == NULL
2101 || expr->ts.cl->length == NULL
2102 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1) != 0)
2105 else if (expr->rank != 0)
2112 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2113 and, in the case of c_associated, set the binding label based on
2117 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2118 gfc_symbol **new_sym)
2120 char name[GFC_MAX_SYMBOL_LEN + 1];
2121 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2122 int optional_arg = 0, is_pointer = 0;
2123 gfc_try retval = SUCCESS;
2124 gfc_symbol *args_sym;
2125 gfc_typespec *arg_ts;
2127 if (args->expr->expr_type == EXPR_CONSTANT
2128 || args->expr->expr_type == EXPR_OP
2129 || args->expr->expr_type == EXPR_NULL)
2131 gfc_error ("Argument to '%s' at %L is not a variable",
2132 sym->name, &(args->expr->where));
2136 args_sym = args->expr->symtree->n.sym;
2138 /* The typespec for the actual arg should be that stored in the expr
2139 and not necessarily that of the expr symbol (args_sym), because
2140 the actual expression could be a part-ref of the expr symbol. */
2141 arg_ts = &(args->expr->ts);
2143 is_pointer = gfc_is_data_pointer (args->expr);
2145 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2147 /* If the user gave two args then they are providing something for
2148 the optional arg (the second cptr). Therefore, set the name and
2149 binding label to the c_associated for two cptrs. Otherwise,
2150 set c_associated to expect one cptr. */
2154 sprintf (name, "%s_2", sym->name);
2155 sprintf (binding_label, "%s_2", sym->binding_label);
2161 sprintf (name, "%s_1", sym->name);
2162 sprintf (binding_label, "%s_1", sym->binding_label);
2166 /* Get a new symbol for the version of c_associated that
2168 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2170 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2171 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2173 sprintf (name, "%s", sym->name);
2174 sprintf (binding_label, "%s", sym->binding_label);
2176 /* Error check the call. */
2177 if (args->next != NULL)
2179 gfc_error_now ("More actual than formal arguments in '%s' "
2180 "call at %L", name, &(args->expr->where));
2183 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2185 /* Make sure we have either the target or pointer attribute. */
2186 if (!args_sym->attr.target && !is_pointer)
2188 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2189 "a TARGET or an associated pointer",
2191 sym->name, &(args->expr->where));
2195 /* See if we have interoperable type and type param. */
2196 if (verify_c_interop (arg_ts) == SUCCESS
2197 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2199 if (args_sym->attr.target == 1)
2201 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2202 has the target attribute and is interoperable. */
2203 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2204 allocatable variable that has the TARGET attribute and
2205 is not an array of zero size. */
2206 if (args_sym->attr.allocatable == 1)
2208 if (args_sym->attr.dimension != 0
2209 && (args_sym->as && args_sym->as->rank == 0))
2211 gfc_error_now ("Allocatable variable '%s' used as a "
2212 "parameter to '%s' at %L must not be "
2213 "an array of zero size",
2214 args_sym->name, sym->name,
2215 &(args->expr->where));
2221 /* A non-allocatable target variable with C
2222 interoperable type and type parameters must be
2224 if (args_sym && args_sym->attr.dimension)
2226 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2228 gfc_error ("Assumed-shape array '%s' at %L "
2229 "cannot be an argument to the "
2230 "procedure '%s' because "
2231 "it is not C interoperable",
2233 &(args->expr->where), sym->name);
2236 else if (args_sym->as->type == AS_DEFERRED)
2238 gfc_error ("Deferred-shape array '%s' at %L "
2239 "cannot be an argument to the "
2240 "procedure '%s' because "
2241 "it is not C interoperable",
2243 &(args->expr->where), sym->name);
2248 /* Make sure it's not a character string. Arrays of
2249 any type should be ok if the variable is of a C
2250 interoperable type. */
2251 if (arg_ts->type == BT_CHARACTER)
2252 if (arg_ts->cl != NULL
2253 && (arg_ts->cl->length == NULL
2254 || arg_ts->cl->length->expr_type
2257 (arg_ts->cl->length->value.integer, 1)
2259 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2261 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2262 "at %L must have a length of 1",
2263 args_sym->name, sym->name,
2264 &(args->expr->where));
2270 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2272 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2274 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2275 "associated scalar POINTER", args_sym->name,
2276 sym->name, &(args->expr->where));
2282 /* The parameter is not required to be C interoperable. If it
2283 is not C interoperable, it must be a nonpolymorphic scalar
2284 with no length type parameters. It still must have either
2285 the pointer or target attribute, and it can be
2286 allocatable (but must be allocated when c_loc is called). */
2287 if (args->expr->rank != 0
2288 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2290 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2291 "scalar", args_sym->name, sym->name,
2292 &(args->expr->where));
2295 else if (arg_ts->type == BT_CHARACTER
2296 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2298 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2299 "%L must have a length of 1",
2300 args_sym->name, sym->name,
2301 &(args->expr->where));
2306 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2308 if (args_sym->attr.flavor != FL_PROCEDURE)
2310 /* TODO: Update this error message to allow for procedure
2311 pointers once they are implemented. */
2312 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2314 args_sym->name, sym->name,
2315 &(args->expr->where));
2318 else if (args_sym->attr.is_bind_c != 1)
2320 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2322 args_sym->name, sym->name,
2323 &(args->expr->where));
2328 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2333 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2334 "iso_c_binding function: '%s'!\n", sym->name);
2341 /* Resolve a function call, which means resolving the arguments, then figuring
2342 out which entity the name refers to. */
2343 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2344 to INTENT(OUT) or INTENT(INOUT). */
2347 resolve_function (gfc_expr *expr)
2349 gfc_actual_arglist *arg;
2354 procedure_type p = PROC_INTRINSIC;
2355 bool no_formal_args;
2359 sym = expr->symtree->n.sym;
2361 if (sym && sym->attr.intrinsic
2362 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2365 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2367 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2371 if (sym && sym->attr.abstract)
2373 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2374 sym->name, &expr->where);
2378 /* Switch off assumed size checking and do this again for certain kinds
2379 of procedure, once the procedure itself is resolved. */
2380 need_full_assumed_size++;
2382 if (expr->symtree && expr->symtree->n.sym)
2383 p = expr->symtree->n.sym->attr.proc;
2385 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2386 if (resolve_actual_arglist (expr->value.function.actual,
2387 p, no_formal_args) == FAILURE)
2390 /* Need to setup the call to the correct c_associated, depending on
2391 the number of cptrs to user gives to compare. */
2392 if (sym && sym->attr.is_iso_c == 1)
2394 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2398 /* Get the symtree for the new symbol (resolved func).
2399 the old one will be freed later, when it's no longer used. */
2400 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2403 /* Resume assumed_size checking. */
2404 need_full_assumed_size--;
2406 /* If the procedure is external, check for usage. */
2407 if (sym && is_external_proc (sym))
2408 resolve_global_procedure (sym, &expr->where,
2409 &expr->value.function.actual, 0);
2411 if (sym && sym->ts.type == BT_CHARACTER
2413 && sym->ts.cl->length == NULL
2415 && expr->value.function.esym == NULL
2416 && !sym->attr.contained)
2418 /* Internal procedures are taken care of in resolve_contained_fntype. */
2419 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2420 "be used at %L since it is not a dummy argument",
2421 sym->name, &expr->where);
2425 /* See if function is already resolved. */
2427 if (expr->value.function.name != NULL)
2429 if (expr->ts.type == BT_UNKNOWN)
2435 /* Apply the rules of section 14.1.2. */
2437 switch (procedure_kind (sym))
2440 t = resolve_generic_f (expr);
2443 case PTYPE_SPECIFIC:
2444 t = resolve_specific_f (expr);
2448 t = resolve_unknown_f (expr);
2452 gfc_internal_error ("resolve_function(): bad function type");
2456 /* If the expression is still a function (it might have simplified),
2457 then we check to see if we are calling an elemental function. */
2459 if (expr->expr_type != EXPR_FUNCTION)
2462 temp = need_full_assumed_size;
2463 need_full_assumed_size = 0;
2465 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2468 if (omp_workshare_flag
2469 && expr->value.function.esym
2470 && ! gfc_elemental (expr->value.function.esym))
2472 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2473 "in WORKSHARE construct", expr->value.function.esym->name,
2478 #define GENERIC_ID expr->value.function.isym->id
2479 else if (expr->value.function.actual != NULL
2480 && expr->value.function.isym != NULL
2481 && GENERIC_ID != GFC_ISYM_LBOUND
2482 && GENERIC_ID != GFC_ISYM_LEN
2483 && GENERIC_ID != GFC_ISYM_LOC
2484 && GENERIC_ID != GFC_ISYM_PRESENT)
2486 /* Array intrinsics must also have the last upper bound of an
2487 assumed size array argument. UBOUND and SIZE have to be
2488 excluded from the check if the second argument is anything
2491 for (arg = expr->value.function.actual; arg; arg = arg->next)
2493 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2494 && arg->next != NULL && arg->next->expr)
2496 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2499 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2502 if ((int)mpz_get_si (arg->next->expr->value.integer)
2507 if (arg->expr != NULL
2508 && arg->expr->rank > 0
2509 && resolve_assumed_size_actual (arg->expr))
2515 need_full_assumed_size = temp;
2518 if (!pure_function (expr, &name) && name)
2522 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2523 "FORALL %s", name, &expr->where,
2524 forall_flag == 2 ? "mask" : "block");
2527 else if (gfc_pure (NULL))
2529 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2530 "procedure within a PURE procedure", name, &expr->where);
2535 /* Functions without the RECURSIVE attribution are not allowed to
2536 * call themselves. */
2537 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2540 esym = expr->value.function.esym;
2542 if (is_illegal_recursion (esym, gfc_current_ns))
2544 if (esym->attr.entry && esym->ns->entries)
2545 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2546 " function '%s' is not RECURSIVE",
2547 esym->name, &expr->where, esym->ns->entries->sym->name);
2549 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2550 " is not RECURSIVE", esym->name, &expr->where);
2556 /* Character lengths of use associated functions may contains references to
2557 symbols not referenced from the current program unit otherwise. Make sure
2558 those symbols are marked as referenced. */
2560 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2561 && expr->value.function.esym->attr.use_assoc)
2563 gfc_expr_set_symbols_referenced (expr->ts.cl->length);
2567 && !((expr->value.function.esym
2568 && expr->value.function.esym->attr.elemental)
2570 (expr->value.function.isym
2571 && expr->value.function.isym->elemental)))
2572 find_noncopying_intrinsics (expr->value.function.esym,
2573 expr->value.function.actual);
2575 /* Make sure that the expression has a typespec that works. */
2576 if (expr->ts.type == BT_UNKNOWN)
2578 if (expr->symtree->n.sym->result
2579 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2580 && !expr->symtree->n.sym->result->attr.proc_pointer)
2581 expr->ts = expr->symtree->n.sym->result->ts;
2588 /************* Subroutine resolution *************/
2591 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2597 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2598 sym->name, &c->loc);
2599 else if (gfc_pure (NULL))
2600 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2606 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2610 if (sym->attr.generic)
2612 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2615 c->resolved_sym = s;
2616 pure_subroutine (c, s);
2620 /* TODO: Need to search for elemental references in generic interface. */
2623 if (sym->attr.intrinsic)
2624 return gfc_intrinsic_sub_interface (c, 0);
2631 resolve_generic_s (gfc_code *c)
2636 sym = c->symtree->n.sym;
2640 m = resolve_generic_s0 (c, sym);
2643 else if (m == MATCH_ERROR)
2647 if (sym->ns->parent == NULL)
2649 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2653 if (!generic_sym (sym))
2657 /* Last ditch attempt. See if the reference is to an intrinsic
2658 that possesses a matching interface. 14.1.2.4 */
2659 sym = c->symtree->n.sym;
2661 if (!gfc_is_intrinsic (sym, 1, c->loc))
2663 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2664 sym->name, &c->loc);
2668 m = gfc_intrinsic_sub_interface (c, 0);
2672 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2673 "intrinsic subroutine interface", sym->name, &c->loc);
2679 /* Set the name and binding label of the subroutine symbol in the call
2680 expression represented by 'c' to include the type and kind of the
2681 second parameter. This function is for resolving the appropriate
2682 version of c_f_pointer() and c_f_procpointer(). For example, a
2683 call to c_f_pointer() for a default integer pointer could have a
2684 name of c_f_pointer_i4. If no second arg exists, which is an error
2685 for these two functions, it defaults to the generic symbol's name
2686 and binding label. */
2689 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2690 char *name, char *binding_label)
2692 gfc_expr *arg = NULL;
2696 /* The second arg of c_f_pointer and c_f_procpointer determines
2697 the type and kind for the procedure name. */
2698 arg = c->ext.actual->next->expr;
2702 /* Set up the name to have the given symbol's name,
2703 plus the type and kind. */
2704 /* a derived type is marked with the type letter 'u' */
2705 if (arg->ts.type == BT_DERIVED)
2708 kind = 0; /* set the kind as 0 for now */
2712 type = gfc_type_letter (arg->ts.type);
2713 kind = arg->ts.kind;
2716 if (arg->ts.type == BT_CHARACTER)
2717 /* Kind info for character strings not needed. */
2720 sprintf (name, "%s_%c%d", sym->name, type, kind);
2721 /* Set up the binding label as the given symbol's label plus
2722 the type and kind. */
2723 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2727 /* If the second arg is missing, set the name and label as
2728 was, cause it should at least be found, and the missing
2729 arg error will be caught by compare_parameters(). */
2730 sprintf (name, "%s", sym->name);
2731 sprintf (binding_label, "%s", sym->binding_label);
2738 /* Resolve a generic version of the iso_c_binding procedure given
2739 (sym) to the specific one based on the type and kind of the
2740 argument(s). Currently, this function resolves c_f_pointer() and
2741 c_f_procpointer based on the type and kind of the second argument
2742 (FPTR). Other iso_c_binding procedures aren't specially handled.
2743 Upon successfully exiting, c->resolved_sym will hold the resolved
2744 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2748 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2750 gfc_symbol *new_sym;
2751 /* this is fine, since we know the names won't use the max */
2752 char name[GFC_MAX_SYMBOL_LEN + 1];
2753 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2754 /* default to success; will override if find error */
2755 match m = MATCH_YES;
2757 /* Make sure the actual arguments are in the necessary order (based on the
2758 formal args) before resolving. */
2759 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2761 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2762 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2764 set_name_and_label (c, sym, name, binding_label);
2766 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2768 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2770 /* Make sure we got a third arg if the second arg has non-zero
2771 rank. We must also check that the type and rank are
2772 correct since we short-circuit this check in
2773 gfc_procedure_use() (called above to sort actual args). */
2774 if (c->ext.actual->next->expr->rank != 0)
2776 if(c->ext.actual->next->next == NULL
2777 || c->ext.actual->next->next->expr == NULL)
2780 gfc_error ("Missing SHAPE parameter for call to %s "
2781 "at %L", sym->name, &(c->loc));
2783 else if (c->ext.actual->next->next->expr->ts.type
2785 || c->ext.actual->next->next->expr->rank != 1)
2788 gfc_error ("SHAPE parameter for call to %s at %L must "
2789 "be a rank 1 INTEGER array", sym->name,
2796 if (m != MATCH_ERROR)
2798 /* the 1 means to add the optional arg to formal list */
2799 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2801 /* for error reporting, say it's declared where the original was */
2802 new_sym->declared_at = sym->declared_at;
2807 /* no differences for c_loc or c_funloc */
2811 /* set the resolved symbol */
2812 if (m != MATCH_ERROR)
2813 c->resolved_sym = new_sym;
2815 c->resolved_sym = sym;
2821 /* Resolve a subroutine call known to be specific. */
2824 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2828 if(sym->attr.is_iso_c)
2830 m = gfc_iso_c_sub_interface (c,sym);
2834 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2836 if (sym->attr.dummy)
2838 sym->attr.proc = PROC_DUMMY;
2842 sym->attr.proc = PROC_EXTERNAL;
2846 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2849 if (sym->attr.intrinsic)
2851 m = gfc_intrinsic_sub_interface (c, 1);
2855 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2856 "with an intrinsic", sym->name, &c->loc);
2864 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2866 c->resolved_sym = sym;
2867 pure_subroutine (c, sym);
2874 resolve_specific_s (gfc_code *c)
2879 sym = c->symtree->n.sym;
2883 m = resolve_specific_s0 (c, sym);
2886 if (m == MATCH_ERROR)
2889 if (sym->ns->parent == NULL)
2892 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2898 sym = c->symtree->n.sym;
2899 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
2900 sym->name, &c->loc);
2906 /* Resolve a subroutine call not known to be generic nor specific. */
2909 resolve_unknown_s (gfc_code *c)
2913 sym = c->symtree->n.sym;
2915 if (sym->attr.dummy)
2917 sym->attr.proc = PROC_DUMMY;
2921 /* See if we have an intrinsic function reference. */
2923 if (gfc_is_intrinsic (sym, 1, c->loc))
2925 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
2930 /* The reference is to an external name. */
2933 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2935 c->resolved_sym = sym;
2937 pure_subroutine (c, sym);
2943 /* Resolve a subroutine call. Although it was tempting to use the same code
2944 for functions, subroutines and functions are stored differently and this
2945 makes things awkward. */
2948 resolve_call (gfc_code *c)
2951 procedure_type ptype = PROC_INTRINSIC;
2952 gfc_symbol *csym, *sym;
2953 bool no_formal_args;
2955 csym = c->symtree ? c->symtree->n.sym : NULL;
2957 if (csym && csym->ts.type != BT_UNKNOWN)
2959 gfc_error ("'%s' at %L has a type, which is not consistent with "
2960 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
2964 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
2967 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
2968 sym = st ? st->n.sym : NULL;
2969 if (sym && csym != sym
2970 && sym->ns == gfc_current_ns
2971 && sym->attr.flavor == FL_PROCEDURE
2972 && sym->attr.contained)
2975 if (csym->attr.generic)
2976 c->symtree->n.sym = sym;
2979 csym = c->symtree->n.sym;
2983 /* Subroutines without the RECURSIVE attribution are not allowed to
2984 * call themselves. */
2985 if (csym && is_illegal_recursion (csym, gfc_current_ns))
2987 if (csym->attr.entry && csym->ns->entries)
2988 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2989 " subroutine '%s' is not RECURSIVE",
2990 csym->name, &c->loc, csym->ns->entries->sym->name);
2992 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
2993 " is not RECURSIVE", csym->name, &c->loc);
2998 /* Switch off assumed size checking and do this again for certain kinds
2999 of procedure, once the procedure itself is resolved. */
3000 need_full_assumed_size++;
3003 ptype = csym->attr.proc;
3005 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3006 if (resolve_actual_arglist (c->ext.actual, ptype,
3007 no_formal_args) == FAILURE)
3010 /* Resume assumed_size checking. */
3011 need_full_assumed_size--;
3013 /* If external, check for usage. */
3014 if (csym && is_external_proc (csym))
3015 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3018 if (c->resolved_sym == NULL)
3020 c->resolved_isym = NULL;
3021 switch (procedure_kind (csym))
3024 t = resolve_generic_s (c);
3027 case PTYPE_SPECIFIC:
3028 t = resolve_specific_s (c);
3032 t = resolve_unknown_s (c);
3036 gfc_internal_error ("resolve_subroutine(): bad function type");
3040 /* Some checks of elemental subroutine actual arguments. */
3041 if (resolve_elemental_actual (NULL, c) == FAILURE)
3044 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3045 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3050 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3051 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3052 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3053 if their shapes do not match. If either op1->shape or op2->shape is
3054 NULL, return SUCCESS. */
3057 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3064 if (op1->shape != NULL && op2->shape != NULL)
3066 for (i = 0; i < op1->rank; i++)
3068 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3070 gfc_error ("Shapes for operands at %L and %L are not conformable",
3071 &op1->where, &op2->where);
3082 /* Resolve an operator expression node. This can involve replacing the
3083 operation with a user defined function call. */
3086 resolve_operator (gfc_expr *e)
3088 gfc_expr *op1, *op2;
3090 bool dual_locus_error;
3093 /* Resolve all subnodes-- give them types. */
3095 switch (e->value.op.op)
3098 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3101 /* Fall through... */
3104 case INTRINSIC_UPLUS:
3105 case INTRINSIC_UMINUS:
3106 case INTRINSIC_PARENTHESES:
3107 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3112 /* Typecheck the new node. */
3114 op1 = e->value.op.op1;
3115 op2 = e->value.op.op2;
3116 dual_locus_error = false;
3118 if ((op1 && op1->expr_type == EXPR_NULL)
3119 || (op2 && op2->expr_type == EXPR_NULL))
3121 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3125 switch (e->value.op.op)
3127 case INTRINSIC_UPLUS:
3128 case INTRINSIC_UMINUS:
3129 if (op1->ts.type == BT_INTEGER
3130 || op1->ts.type == BT_REAL
3131 || op1->ts.type == BT_COMPLEX)
3137 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3138 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3141 case INTRINSIC_PLUS:
3142 case INTRINSIC_MINUS:
3143 case INTRINSIC_TIMES:
3144 case INTRINSIC_DIVIDE:
3145 case INTRINSIC_POWER:
3146 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3148 gfc_type_convert_binary (e);
3153 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3154 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3155 gfc_typename (&op2->ts));
3158 case INTRINSIC_CONCAT:
3159 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3160 && op1->ts.kind == op2->ts.kind)
3162 e->ts.type = BT_CHARACTER;
3163 e->ts.kind = op1->ts.kind;
3168 _("Operands of string concatenation operator at %%L are %s/%s"),
3169 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3175 case INTRINSIC_NEQV:
3176 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3178 e->ts.type = BT_LOGICAL;
3179 e->ts.kind = gfc_kind_max (op1, op2);
3180 if (op1->ts.kind < e->ts.kind)
3181 gfc_convert_type (op1, &e->ts, 2);
3182 else if (op2->ts.kind < e->ts.kind)
3183 gfc_convert_type (op2, &e->ts, 2);
3187 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3188 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3189 gfc_typename (&op2->ts));
3194 if (op1->ts.type == BT_LOGICAL)
3196 e->ts.type = BT_LOGICAL;
3197 e->ts.kind = op1->ts.kind;
3201 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3202 gfc_typename (&op1->ts));
3206 case INTRINSIC_GT_OS:
3208 case INTRINSIC_GE_OS:
3210 case INTRINSIC_LT_OS:
3212 case INTRINSIC_LE_OS:
3213 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3215 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3219 /* Fall through... */
3222 case INTRINSIC_EQ_OS:
3224 case INTRINSIC_NE_OS:
3225 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3226 && op1->ts.kind == op2->ts.kind)
3228 e->ts.type = BT_LOGICAL;
3229 e->ts.kind = gfc_default_logical_kind;
3233 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3235 gfc_type_convert_binary (e);
3237 e->ts.type = BT_LOGICAL;
3238 e->ts.kind = gfc_default_logical_kind;
3242 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3244 _("Logicals at %%L must be compared with %s instead of %s"),
3245 (e->value.op.op == INTRINSIC_EQ
3246 || e->value.op.op == INTRINSIC_EQ_OS)
3247 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3250 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3251 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3252 gfc_typename (&op2->ts));
3256 case INTRINSIC_USER:
3257 if (e->value.op.uop->op == NULL)
3258 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3259 else if (op2 == NULL)
3260 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3261 e->value.op.uop->name, gfc_typename (&op1->ts));
3263 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3264 e->value.op.uop->name, gfc_typename (&op1->ts),
3265 gfc_typename (&op2->ts));
3269 case INTRINSIC_PARENTHESES:
3271 if (e->ts.type == BT_CHARACTER)
3272 e->ts.cl = op1->ts.cl;
3276 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3279 /* Deal with arrayness of an operand through an operator. */
3283 switch (e->value.op.op)
3285 case INTRINSIC_PLUS:
3286 case INTRINSIC_MINUS:
3287 case INTRINSIC_TIMES:
3288 case INTRINSIC_DIVIDE:
3289 case INTRINSIC_POWER:
3290 case INTRINSIC_CONCAT:
3294 case INTRINSIC_NEQV:
3296 case INTRINSIC_EQ_OS:
3298 case INTRINSIC_NE_OS:
3300 case INTRINSIC_GT_OS:
3302 case INTRINSIC_GE_OS:
3304 case INTRINSIC_LT_OS:
3306 case INTRINSIC_LE_OS:
3308 if (op1->rank == 0 && op2->rank == 0)
3311 if (op1->rank == 0 && op2->rank != 0)
3313 e->rank = op2->rank;
3315 if (e->shape == NULL)
3316 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3319 if (op1->rank != 0 && op2->rank == 0)
3321 e->rank = op1->rank;
3323 if (e->shape == NULL)
3324 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3327 if (op1->rank != 0 && op2->rank != 0)
3329 if (op1->rank == op2->rank)
3331 e->rank = op1->rank;
3332 if (e->shape == NULL)
3334 t = compare_shapes(op1, op2);
3338 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3343 /* Allow higher level expressions to work. */
3346 /* Try user-defined operators, and otherwise throw an error. */
3347 dual_locus_error = true;
3349 _("Inconsistent ranks for operator at %%L and %%L"));
3356 case INTRINSIC_PARENTHESES:
3358 case INTRINSIC_UPLUS:
3359 case INTRINSIC_UMINUS:
3360 /* Simply copy arrayness attribute */
3361 e->rank = op1->rank;
3363 if (e->shape == NULL)
3364 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3372 /* Attempt to simplify the expression. */
3375 t = gfc_simplify_expr (e, 0);
3376 /* Some calls do not succeed in simplification and return FAILURE
3377 even though there is no error; e.g. variable references to
3378 PARAMETER arrays. */
3379 if (!gfc_is_constant_expr (e))
3386 if (gfc_extend_expr (e) == SUCCESS)
3389 if (dual_locus_error)
3390 gfc_error (msg, &op1->where, &op2->where);
3392 gfc_error (msg, &e->where);
3398 /************** Array resolution subroutines **************/
3401 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3404 /* Compare two integer expressions. */
3407 compare_bound (gfc_expr *a, gfc_expr *b)
3411 if (a == NULL || a->expr_type != EXPR_CONSTANT
3412 || b == NULL || b->expr_type != EXPR_CONSTANT)
3415 /* If either of the types isn't INTEGER, we must have
3416 raised an error earlier. */
3418 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3421 i = mpz_cmp (a->value.integer, b->value.integer);
3431 /* Compare an integer expression with an integer. */
3434 compare_bound_int (gfc_expr *a, int b)
3438 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3441 if (a->ts.type != BT_INTEGER)
3442 gfc_internal_error ("compare_bound_int(): Bad expression");
3444 i = mpz_cmp_si (a->value.integer, b);
3454 /* Compare an integer expression with a mpz_t. */
3457 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3461 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3464 if (a->ts.type != BT_INTEGER)
3465 gfc_internal_error ("compare_bound_int(): Bad expression");
3467 i = mpz_cmp (a->value.integer, b);
3477 /* Compute the last value of a sequence given by a triplet.
3478 Return 0 if it wasn't able to compute the last value, or if the
3479 sequence if empty, and 1 otherwise. */
3482 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3483 gfc_expr *stride, mpz_t last)
3487 if (start == NULL || start->expr_type != EXPR_CONSTANT
3488 || end == NULL || end->expr_type != EXPR_CONSTANT
3489 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3492 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3493 || (stride != NULL && stride->ts.type != BT_INTEGER))
3496 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3498 if (compare_bound (start, end) == CMP_GT)
3500 mpz_set (last, end->value.integer);
3504 if (compare_bound_int (stride, 0) == CMP_GT)
3506 /* Stride is positive */
3507 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3512 /* Stride is negative */
3513 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3518 mpz_sub (rem, end->value.integer, start->value.integer);
3519 mpz_tdiv_r (rem, rem, stride->value.integer);
3520 mpz_sub (last, end->value.integer, rem);
3527 /* Compare a single dimension of an array reference to the array
3531 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3535 /* Given start, end and stride values, calculate the minimum and
3536 maximum referenced indexes. */
3538 switch (ar->dimen_type[i])
3544 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3546 gfc_warning ("Array reference at %L is out of bounds "
3547 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3548 mpz_get_si (ar->start[i]->value.integer),
3549 mpz_get_si (as->lower[i]->value.integer), i+1);
3552 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3554 gfc_warning ("Array reference at %L is out of bounds "
3555 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3556 mpz_get_si (ar->start[i]->value.integer),
3557 mpz_get_si (as->upper[i]->value.integer), i+1);
3565 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3566 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3568 comparison comp_start_end = compare_bound (AR_START, AR_END);
3570 /* Check for zero stride, which is not allowed. */
3571 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3573 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3577 /* if start == len || (stride > 0 && start < len)
3578 || (stride < 0 && start > len),
3579 then the array section contains at least one element. In this
3580 case, there is an out-of-bounds access if
3581 (start < lower || start > upper). */
3582 if (compare_bound (AR_START, AR_END) == CMP_EQ
3583 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3584 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3585 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3586 && comp_start_end == CMP_GT))
3588 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3590 gfc_warning ("Lower array reference at %L is out of bounds "
3591 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3592 mpz_get_si (AR_START->value.integer),
3593 mpz_get_si (as->lower[i]->value.integer), i+1);
3596 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3598 gfc_warning ("Lower array reference at %L is out of bounds "
3599 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3600 mpz_get_si (AR_START->value.integer),
3601 mpz_get_si (as->upper[i]->value.integer), i+1);
3606 /* If we can compute the highest index of the array section,
3607 then it also has to be between lower and upper. */
3608 mpz_init (last_value);
3609 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3612 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3614 gfc_warning ("Upper array reference at %L is out of bounds "
3615 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3616 mpz_get_si (last_value),
3617 mpz_get_si (as->lower[i]->value.integer), i+1);
3618 mpz_clear (last_value);
3621 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3623 gfc_warning ("Upper array reference at %L is out of bounds "
3624 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3625 mpz_get_si (last_value),
3626 mpz_get_si (as->upper[i]->value.integer), i+1);
3627 mpz_clear (last_value);
3631 mpz_clear (last_value);
3639 gfc_internal_error ("check_dimension(): Bad array reference");
3646 /* Compare an array reference with an array specification. */
3649 compare_spec_to_ref (gfc_array_ref *ar)
3656 /* TODO: Full array sections are only allowed as actual parameters. */
3657 if (as->type == AS_ASSUMED_SIZE
3658 && (/*ar->type == AR_FULL
3659 ||*/ (ar->type == AR_SECTION
3660 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3662 gfc_error ("Rightmost upper bound of assumed size array section "
3663 "not specified at %L", &ar->where);
3667 if (ar->type == AR_FULL)
3670 if (as->rank != ar->dimen)
3672 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3673 &ar->where, ar->dimen, as->rank);
3677 for (i = 0; i < as->rank; i++)
3678 if (check_dimension (i, ar, as) == FAILURE)
3685 /* Resolve one part of an array index. */
3688 gfc_resolve_index (gfc_expr *index, int check_scalar)
3695 if (gfc_resolve_expr (index) == FAILURE)
3698 if (check_scalar && index->rank != 0)
3700 gfc_error ("Array index at %L must be scalar", &index->where);
3704 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3706 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3707 &index->where, gfc_basic_typename (index->ts.type));
3711 if (index->ts.type == BT_REAL)
3712 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3713 &index->where) == FAILURE)
3716 if (index->ts.kind != gfc_index_integer_kind
3717 || index->ts.type != BT_INTEGER)
3720 ts.type = BT_INTEGER;
3721 ts.kind = gfc_index_integer_kind;
3723 gfc_convert_type_warn (index, &ts, 2, 0);
3729 /* Resolve a dim argument to an intrinsic function. */
3732 gfc_resolve_dim_arg (gfc_expr *dim)
3737 if (gfc_resolve_expr (dim) == FAILURE)
3742 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3747 if (dim->ts.type != BT_INTEGER)
3749 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3753 if (dim->ts.kind != gfc_index_integer_kind)
3757 ts.type = BT_INTEGER;
3758 ts.kind = gfc_index_integer_kind;
3760 gfc_convert_type_warn (dim, &ts, 2, 0);
3766 /* Given an expression that contains array references, update those array
3767 references to point to the right array specifications. While this is
3768 filled in during matching, this information is difficult to save and load
3769 in a module, so we take care of it here.
3771 The idea here is that the original array reference comes from the
3772 base symbol. We traverse the list of reference structures, setting
3773 the stored reference to references. Component references can
3774 provide an additional array specification. */
3777 find_array_spec (gfc_expr *e)
3781 gfc_symbol *derived;
3784 as = e->symtree->n.sym->as;
3787 for (ref = e->ref; ref; ref = ref->next)
3792 gfc_internal_error ("find_array_spec(): Missing spec");
3799 if (derived == NULL)
3800 derived = e->symtree->n.sym->ts.derived;
3802 c = derived->components;
3804 for (; c; c = c->next)
3805 if (c == ref->u.c.component)
3807 /* Track the sequence of component references. */
3808 if (c->ts.type == BT_DERIVED)
3809 derived = c->ts.derived;
3814 gfc_internal_error ("find_array_spec(): Component not found");
3816 if (c->attr.dimension)
3819 gfc_internal_error ("find_array_spec(): unused as(1)");
3830 gfc_internal_error ("find_array_spec(): unused as(2)");
3834 /* Resolve an array reference. */
3837 resolve_array_ref (gfc_array_ref *ar)
3839 int i, check_scalar;
3842 for (i = 0; i < ar->dimen; i++)
3844 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3846 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3848 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3850 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3855 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3859 ar->dimen_type[i] = DIMEN_ELEMENT;
3863 ar->dimen_type[i] = DIMEN_VECTOR;
3864 if (e->expr_type == EXPR_VARIABLE
3865 && e->symtree->n.sym->ts.type == BT_DERIVED)
3866 ar->start[i] = gfc_get_parentheses (e);
3870 gfc_error ("Array index at %L is an array of rank %d",
3871 &ar->c_where[i], e->rank);
3876 /* If the reference type is unknown, figure out what kind it is. */
3878 if (ar->type == AR_UNKNOWN)
3880 ar->type = AR_ELEMENT;
3881 for (i = 0; i < ar->dimen; i++)
3882 if (ar->dimen_type[i] == DIMEN_RANGE
3883 || ar->dimen_type[i] == DIMEN_VECTOR)
3885 ar->type = AR_SECTION;
3890 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
3898 resolve_substring (gfc_ref *ref)
3900 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
3902 if (ref->u.ss.start != NULL)
3904 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
3907 if (ref->u.ss.start->ts.type != BT_INTEGER)
3909 gfc_error ("Substring start index at %L must be of type INTEGER",
3910 &ref->u.ss.start->where);
3914 if (ref->u.ss.start->rank != 0)
3916 gfc_error ("Substring start index at %L must be scalar",
3917 &ref->u.ss.start->where);
3921 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
3922 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3923 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3925 gfc_error ("Substring start index at %L is less than one",
3926 &ref->u.ss.start->where);
3931 if (ref->u.ss.end != NULL)
3933 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
3936 if (ref->u.ss.end->ts.type != BT_INTEGER)
3938 gfc_error ("Substring end index at %L must be of type INTEGER",
3939 &ref->u.ss.end->where);
3943 if (ref->u.ss.end->rank != 0)
3945 gfc_error ("Substring end index at %L must be scalar",
3946 &ref->u.ss.end->where);
3950 if (ref->u.ss.length != NULL
3951 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
3952 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3953 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3955 gfc_error ("Substring end index at %L exceeds the string length",
3956 &ref->u.ss.start->where);
3960 if (compare_bound_mpz_t (ref->u.ss.end,
3961 gfc_integer_kinds[k].huge) == CMP_GT
3962 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3963 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3965 gfc_error ("Substring end index at %L is too large",
3966 &ref->u.ss.end->where);
3975 /* This function supplies missing substring charlens. */
3978 gfc_resolve_substring_charlen (gfc_expr *e)
3981 gfc_expr *start, *end;
3983 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
3984 if (char_ref->type == REF_SUBSTRING)
3990 gcc_assert (char_ref->next == NULL);
3994 if (e->ts.cl->length)
3995 gfc_free_expr (e->ts.cl->length);
3996 else if (e->expr_type == EXPR_VARIABLE
3997 && e->symtree->n.sym->attr.dummy)
4001 e->ts.type = BT_CHARACTER;
4002 e->ts.kind = gfc_default_character_kind;
4006 e->ts.cl = gfc_get_charlen ();
4007 e->ts.cl->next = gfc_current_ns->cl_list;
4008 gfc_current_ns->cl_list = e->ts.cl;
4011 if (char_ref->u.ss.start)
4012 start = gfc_copy_expr (char_ref->u.ss.start);
4014 start = gfc_int_expr (1);
4016 if (char_ref->u.ss.end)
4017 end = gfc_copy_expr (char_ref->u.ss.end);
4018 else if (e->expr_type == EXPR_VARIABLE)
4019 end = gfc_copy_expr (e->symtree->n.sym->ts.cl->length);
4026 /* Length = (end - start +1). */
4027 e->ts.cl->length = gfc_subtract (end, start);
4028 e->ts.cl->length = gfc_add (e->ts.cl->length, gfc_int_expr (1));
4030 e->ts.cl->length->ts.type = BT_INTEGER;
4031 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4033 /* Make sure that the length is simplified. */
4034 gfc_simplify_expr (e->ts.cl->length, 1);
4035 gfc_resolve_expr (e->ts.cl->length);
4039 /* Resolve subtype references. */
4042 resolve_ref (gfc_expr *expr)
4044 int current_part_dimension, n_components, seen_part_dimension;
4047 for (ref = expr->ref; ref; ref = ref->next)
4048 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4050 find_array_spec (expr);
4054 for (ref = expr->ref; ref; ref = ref->next)
4058 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4066 resolve_substring (ref);
4070 /* Check constraints on part references. */
4072 current_part_dimension = 0;
4073 seen_part_dimension = 0;
4076 for (ref = expr->ref; ref; ref = ref->next)
4081 switch (ref->u.ar.type)
4085 current_part_dimension = 1;
4089 current_part_dimension = 0;
4093 gfc_internal_error ("resolve_ref(): Bad array reference");
4099 if (current_part_dimension || seen_part_dimension)
4101 if (ref->u.c.component->attr.pointer)
4103 gfc_error ("Component to the right of a part reference "
4104 "with nonzero rank must not have the POINTER "
4105 "attribute at %L", &expr->where);
4108 else if (ref->u.c.component->attr.allocatable)
4110 gfc_error ("Component to the right of a part reference "
4111 "with nonzero rank must not have the ALLOCATABLE "
4112 "attribute at %L", &expr->where);
4124 if (((ref->type == REF_COMPONENT && n_components > 1)
4125 || ref->next == NULL)
4126 && current_part_dimension
4127 && seen_part_dimension)
4129 gfc_error ("Two or more part references with nonzero rank must "
4130 "not be specified at %L", &expr->where);
4134 if (ref->type == REF_COMPONENT)
4136 if (current_part_dimension)
4137 seen_part_dimension = 1;
4139 /* reset to make sure */
4140 current_part_dimension = 0;
4148 /* Given an expression, determine its shape. This is easier than it sounds.
4149 Leaves the shape array NULL if it is not possible to determine the shape. */
4152 expression_shape (gfc_expr *e)
4154 mpz_t array[GFC_MAX_DIMENSIONS];
4157 if (e->rank == 0 || e->shape != NULL)
4160 for (i = 0; i < e->rank; i++)
4161 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4164 e->shape = gfc_get_shape (e->rank);
4166 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4171 for (i--; i >= 0; i--)
4172 mpz_clear (array[i]);
4176 /* Given a variable expression node, compute the rank of the expression by
4177 examining the base symbol and any reference structures it may have. */
4180 expression_rank (gfc_expr *e)
4185 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4186 could lead to serious confusion... */
4187 gcc_assert (e->expr_type != EXPR_COMPCALL);
4191 if (e->expr_type == EXPR_ARRAY)
4193 /* Constructors can have a rank different from one via RESHAPE(). */
4195 if (e->symtree == NULL)
4201 e->rank = (e->symtree->n.sym->as == NULL)
4202 ? 0 : e->symtree->n.sym->as->rank;
4208 for (ref = e->ref; ref; ref = ref->next)
4210 if (ref->type != REF_ARRAY)
4213 if (ref->u.ar.type == AR_FULL)
4215 rank = ref->u.ar.as->rank;
4219 if (ref->u.ar.type == AR_SECTION)
4221 /* Figure out the rank of the section. */
4223 gfc_internal_error ("expression_rank(): Two array specs");
4225 for (i = 0; i < ref->u.ar.dimen; i++)
4226 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4227 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4237 expression_shape (e);
4241 /* Resolve a variable expression. */
4244 resolve_variable (gfc_expr *e)
4251 if (e->symtree == NULL)
4254 if (e->ref && resolve_ref (e) == FAILURE)
4257 sym = e->symtree->n.sym;
4258 if (sym->attr.flavor == FL_PROCEDURE
4259 && (!sym->attr.function
4260 || (sym->attr.function && sym->result
4261 && sym->result->attr.proc_pointer
4262 && !sym->result->attr.function)))
4264 e->ts.type = BT_PROCEDURE;
4265 goto resolve_procedure;
4268 if (sym->ts.type != BT_UNKNOWN)
4269 gfc_variable_attr (e, &e->ts);
4272 /* Must be a simple variable reference. */
4273 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4278 if (check_assumed_size_reference (sym, e))
4281 /* Deal with forward references to entries during resolve_code, to
4282 satisfy, at least partially, 12.5.2.5. */
4283 if (gfc_current_ns->entries
4284 && current_entry_id == sym->entry_id
4287 && cs_base->current->op != EXEC_ENTRY)
4289 gfc_entry_list *entry;
4290 gfc_formal_arglist *formal;
4294 /* If the symbol is a dummy... */
4295 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4297 entry = gfc_current_ns->entries;
4300 /* ...test if the symbol is a parameter of previous entries. */
4301 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4302 for (formal = entry->sym->formal; formal; formal = formal->next)
4304 if (formal->sym && sym->name == formal->sym->name)
4308 /* If it has not been seen as a dummy, this is an error. */
4311 if (specification_expr)
4312 gfc_error ("Variable '%s', used in a specification expression"
4313 ", is referenced at %L before the ENTRY statement "
4314 "in which it is a parameter",
4315 sym->name, &cs_base->current->loc);
4317 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4318 "statement in which it is a parameter",
4319 sym->name, &cs_base->current->loc);
4324 /* Now do the same check on the specification expressions. */
4325 specification_expr = 1;
4326 if (sym->ts.type == BT_CHARACTER
4327 && gfc_resolve_expr (sym->ts.cl->length) == FAILURE)
4331 for (n = 0; n < sym->as->rank; n++)
4333 specification_expr = 1;
4334 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4336 specification_expr = 1;
4337 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4340 specification_expr = 0;
4343 /* Update the symbol's entry level. */
4344 sym->entry_id = current_entry_id + 1;
4348 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4355 /* Checks to see that the correct symbol has been host associated.
4356 The only situation where this arises is that in which a twice
4357 contained function is parsed after the host association is made.
4358 Therefore, on detecting this, change the symbol in the expression
4359 and convert the array reference into an actual arglist if the old
4360 symbol is a variable. */
4362 check_host_association (gfc_expr *e)
4364 gfc_symbol *sym, *old_sym;
4368 gfc_actual_arglist *arg, *tail = NULL;
4369 bool retval = e->expr_type == EXPR_FUNCTION;
4371 /* If the expression is the result of substitution in
4372 interface.c(gfc_extend_expr) because there is no way in
4373 which the host association can be wrong. */
4374 if (e->symtree == NULL
4375 || e->symtree->n.sym == NULL
4376 || e->user_operator)
4379 old_sym = e->symtree->n.sym;
4381 if (gfc_current_ns->parent
4382 && old_sym->ns != gfc_current_ns)
4384 /* Use the 'USE' name so that renamed module symbols are
4385 correctly handled. */
4386 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4388 if (sym && old_sym != sym
4389 && sym->ts.type == old_sym->ts.type
4390 && sym->attr.flavor == FL_PROCEDURE
4391 && sym->attr.contained)
4393 /* Clear the shape, since it might not be valid. */
4394 if (e->shape != NULL)
4396 for (n = 0; n < e->rank; n++)
4397 mpz_clear (e->shape[n]);
4399 gfc_free (e->shape);
4402 /* Give the symbol a symtree in the right place! */
4403 gfc_get_sym_tree (sym->name, gfc_current_ns, &st);
4406 if (old_sym->attr.flavor == FL_PROCEDURE)
4408 /* Original was function so point to the new symbol, since
4409 the actual argument list is already attached to the
4411 e->value.function.esym = NULL;
4416 /* Original was variable so convert array references into
4417 an actual arglist. This does not need any checking now
4418 since gfc_resolve_function will take care of it. */
4419 e->value.function.actual = NULL;
4420 e->expr_type = EXPR_FUNCTION;
4423 /* Ambiguity will not arise if the array reference is not
4424 the last reference. */
4425 for (ref = e->ref; ref; ref = ref->next)
4426 if (ref->type == REF_ARRAY && ref->next == NULL)
4429 gcc_assert (ref->type == REF_ARRAY);
4431 /* Grab the start expressions from the array ref and
4432 copy them into actual arguments. */
4433 for (n = 0; n < ref->u.ar.dimen; n++)
4435 arg = gfc_get_actual_arglist ();
4436 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4437 if (e->value.function.actual == NULL)
4438 tail = e->value.function.actual = arg;
4446 /* Dump the reference list and set the rank. */
4447 gfc_free_ref_list (e->ref);
4449 e->rank = sym->as ? sym->as->rank : 0;
4452 gfc_resolve_expr (e);
4456 /* This might have changed! */
4457 return e->expr_type == EXPR_FUNCTION;
4462 gfc_resolve_character_operator (gfc_expr *e)
4464 gfc_expr *op1 = e->value.op.op1;
4465 gfc_expr *op2 = e->value.op.op2;
4466 gfc_expr *e1 = NULL;
4467 gfc_expr *e2 = NULL;
4469 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4471 if (op1->ts.cl && op1->ts.cl->length)
4472 e1 = gfc_copy_expr (op1->ts.cl->length);
4473 else if (op1->expr_type == EXPR_CONSTANT)
4474 e1 = gfc_int_expr (op1->value.character.length);
4476 if (op2->ts.cl && op2->ts.cl->length)
4477 e2 = gfc_copy_expr (op2->ts.cl->length);
4478 else if (op2->expr_type == EXPR_CONSTANT)
4479 e2 = gfc_int_expr (op2->value.character.length);
4481 e->ts.cl = gfc_get_charlen ();
4482 e->ts.cl->next = gfc_current_ns->cl_list;
4483 gfc_current_ns->cl_list = e->ts.cl;
4488 e->ts.cl->length = gfc_add (e1, e2);
4489 e->ts.cl->length->ts.type = BT_INTEGER;
4490 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4491 gfc_simplify_expr (e->ts.cl->length, 0);
4492 gfc_resolve_expr (e->ts.cl->length);
4498 /* Ensure that an character expression has a charlen and, if possible, a
4499 length expression. */
4502 fixup_charlen (gfc_expr *e)
4504 /* The cases fall through so that changes in expression type and the need
4505 for multiple fixes are picked up. In all circumstances, a charlen should
4506 be available for the middle end to hang a backend_decl on. */
4507 switch (e->expr_type)
4510 gfc_resolve_character_operator (e);
4513 if (e->expr_type == EXPR_ARRAY)
4514 gfc_resolve_character_array_constructor (e);
4516 case EXPR_SUBSTRING:
4517 if (!e->ts.cl && e->ref)
4518 gfc_resolve_substring_charlen (e);
4523 e->ts.cl = gfc_get_charlen ();
4524 e->ts.cl->next = gfc_current_ns->cl_list;
4525 gfc_current_ns->cl_list = e->ts.cl;
4533 /* Update an actual argument to include the passed-object for type-bound
4534 procedures at the right position. */
4536 static gfc_actual_arglist*
4537 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos)
4539 gcc_assert (argpos > 0);
4543 gfc_actual_arglist* result;
4545 result = gfc_get_actual_arglist ();
4553 gcc_assert (argpos > 1);
4555 lst->next = update_arglist_pass (lst->next, po, argpos - 1);
4560 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4563 extract_compcall_passed_object (gfc_expr* e)
4567 gcc_assert (e->expr_type == EXPR_COMPCALL);
4569 po = gfc_get_expr ();
4570 po->expr_type = EXPR_VARIABLE;
4571 po->symtree = e->symtree;
4572 po->ref = gfc_copy_ref (e->ref);
4574 if (gfc_resolve_expr (po) == FAILURE)
4581 /* Update the arglist of an EXPR_COMPCALL expression to include the
4585 update_compcall_arglist (gfc_expr* e)
4588 gfc_typebound_proc* tbp;
4590 tbp = e->value.compcall.tbp;
4595 po = extract_compcall_passed_object (e);
4601 gfc_error ("Passed-object at %L must be scalar", &e->where);
4611 gcc_assert (tbp->pass_arg_num > 0);
4612 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4619 /* Check that the object a TBP is called on is valid, i.e. it must not be
4620 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4623 check_typebound_baseobject (gfc_expr* e)
4627 base = extract_compcall_passed_object (e);
4631 gcc_assert (base->ts.type == BT_DERIVED);
4632 if (base->ts.derived->attr.abstract)
4634 gfc_error ("Base object for type-bound procedure call at %L is of"
4635 " ABSTRACT type '%s'", &e->where, base->ts.derived->name);
4643 /* Resolve a call to a type-bound procedure, either function or subroutine,
4644 statically from the data in an EXPR_COMPCALL expression. The adapted
4645 arglist and the target-procedure symtree are returned. */
4648 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4649 gfc_actual_arglist** actual)
4651 gcc_assert (e->expr_type == EXPR_COMPCALL);
4652 gcc_assert (!e->value.compcall.tbp->is_generic);
4654 /* Update the actual arglist for PASS. */
4655 if (update_compcall_arglist (e) == FAILURE)
4658 *actual = e->value.compcall.actual;
4659 *target = e->value.compcall.tbp->u.specific;
4661 gfc_free_ref_list (e->ref);
4663 e->value.compcall.actual = NULL;
4669 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4670 which of the specific bindings (if any) matches the arglist and transform
4671 the expression into a call of that binding. */
4674 resolve_typebound_generic_call (gfc_expr* e)
4676 gfc_typebound_proc* genproc;
4677 const char* genname;
4679 gcc_assert (e->expr_type == EXPR_COMPCALL);
4680 genname = e->value.compcall.name;
4681 genproc = e->value.compcall.tbp;
4683 if (!genproc->is_generic)
4686 /* Try the bindings on this type and in the inheritance hierarchy. */
4687 for (; genproc; genproc = genproc->overridden)
4691 gcc_assert (genproc->is_generic);
4692 for (g = genproc->u.generic; g; g = g->next)
4695 gfc_actual_arglist* args;
4698 gcc_assert (g->specific);
4700 if (g->specific->error)
4703 target = g->specific->u.specific->n.sym;
4705 /* Get the right arglist by handling PASS/NOPASS. */
4706 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4707 if (!g->specific->nopass)
4710 po = extract_compcall_passed_object (e);
4714 gcc_assert (g->specific->pass_arg_num > 0);
4715 gcc_assert (!g->specific->error);
4716 args = update_arglist_pass (args, po, g->specific->pass_arg_num);
4718 resolve_actual_arglist (args, target->attr.proc,
4719 is_external_proc (target) && !target->formal);
4721 /* Check if this arglist matches the formal. */
4722 matches = gfc_arglist_matches_symbol (&args, target);
4724 /* Clean up and break out of the loop if we've found it. */
4725 gfc_free_actual_arglist (args);
4728 e->value.compcall.tbp = g->specific;
4734 /* Nothing matching found! */
4735 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4736 " '%s' at %L", genname, &e->where);
4744 /* Resolve a call to a type-bound subroutine. */
4747 resolve_typebound_call (gfc_code* c)
4749 gfc_actual_arglist* newactual;
4750 gfc_symtree* target;
4752 /* Check that's really a SUBROUTINE. */
4753 if (!c->expr1->value.compcall.tbp->subroutine)
4755 gfc_error ("'%s' at %L should be a SUBROUTINE",
4756 c->expr1->value.compcall.name, &c->loc);
4760 if (check_typebound_baseobject (c->expr1) == FAILURE)
4763 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
4766 /* Transform into an ordinary EXEC_CALL for now. */
4768 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
4771 c->ext.actual = newactual;
4772 c->symtree = target;
4775 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
4776 gfc_free_expr (c->expr1);
4779 return resolve_call (c);
4783 /* Resolve a component-call expression. */
4786 resolve_compcall (gfc_expr* e)
4788 gfc_actual_arglist* newactual;
4789 gfc_symtree* target;
4791 /* Check that's really a FUNCTION. */
4792 if (!e->value.compcall.tbp->function)
4794 gfc_error ("'%s' at %L should be a FUNCTION",
4795 e->value.compcall.name, &e->where);
4799 if (check_typebound_baseobject (e) == FAILURE)
4802 if (resolve_typebound_generic_call (e) == FAILURE)
4804 gcc_assert (!e->value.compcall.tbp->is_generic);
4806 /* Take the rank from the function's symbol. */
4807 if (e->value.compcall.tbp->u.specific->n.sym->as)
4808 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
4810 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
4811 arglist to the TBP's binding target. */
4813 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
4816 e->value.function.actual = newactual;
4817 e->value.function.name = e->value.compcall.name;
4818 e->value.function.isym = NULL;
4819 e->value.function.esym = NULL;
4820 e->symtree = target;
4821 e->ts = target->n.sym->ts;
4822 e->expr_type = EXPR_FUNCTION;
4824 return gfc_resolve_expr (e);
4828 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
4831 resolve_ppc_call (gfc_code* c)
4833 gfc_component *comp;
4834 gcc_assert (is_proc_ptr_comp (c->expr1, &comp));
4836 c->resolved_sym = c->expr1->symtree->n.sym;
4837 c->expr1->expr_type = EXPR_VARIABLE;
4838 c->ext.actual = c->expr1->value.compcall.actual;
4840 if (!comp->attr.subroutine)
4841 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
4843 if (resolve_ref (c->expr1) == FAILURE)
4846 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
4847 comp->formal == NULL) == FAILURE)
4850 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
4856 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
4859 resolve_expr_ppc (gfc_expr* e)
4861 gfc_component *comp;
4862 gcc_assert (is_proc_ptr_comp (e, &comp));
4864 /* Convert to EXPR_FUNCTION. */
4865 e->expr_type = EXPR_FUNCTION;
4866 e->value.function.isym = NULL;
4867 e->value.function.actual = e->value.compcall.actual;
4869 if (comp->as != NULL)
4870 e->rank = comp->as->rank;
4872 if (!comp->attr.function)
4873 gfc_add_function (&comp->attr, comp->name, &e->where);
4875 if (resolve_ref (e) == FAILURE)
4878 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
4879 comp->formal == NULL) == FAILURE)
4882 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
4888 /* Resolve an expression. That is, make sure that types of operands agree
4889 with their operators, intrinsic operators are converted to function calls
4890 for overloaded types and unresolved function references are resolved. */
4893 gfc_resolve_expr (gfc_expr *e)
4900 switch (e->expr_type)
4903 t = resolve_operator (e);
4909 if (check_host_association (e))
4910 t = resolve_function (e);
4913 t = resolve_variable (e);
4915 expression_rank (e);
4918 if (e->ts.type == BT_CHARACTER && e->ts.cl == NULL && e->ref
4919 && e->ref->type != REF_SUBSTRING)
4920 gfc_resolve_substring_charlen (e);
4925 t = resolve_compcall (e);
4928 case EXPR_SUBSTRING:
4929 t = resolve_ref (e);
4938 t = resolve_expr_ppc (e);
4943 if (resolve_ref (e) == FAILURE)
4946 t = gfc_resolve_array_constructor (e);
4947 /* Also try to expand a constructor. */
4950 expression_rank (e);
4951 gfc_expand_constructor (e);
4954 /* This provides the opportunity for the length of constructors with
4955 character valued function elements to propagate the string length
4956 to the expression. */
4957 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
4958 t = gfc_resolve_character_array_constructor (e);
4962 case EXPR_STRUCTURE:
4963 t = resolve_ref (e);
4967 t = resolve_structure_cons (e);
4971 t = gfc_simplify_expr (e, 0);
4975 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
4978 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.cl)
4985 /* Resolve an expression from an iterator. They must be scalar and have
4986 INTEGER or (optionally) REAL type. */
4989 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
4990 const char *name_msgid)
4992 if (gfc_resolve_expr (expr) == FAILURE)
4995 if (expr->rank != 0)
4997 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5001 if (expr->ts.type != BT_INTEGER)
5003 if (expr->ts.type == BT_REAL)
5006 return gfc_notify_std (GFC_STD_F95_DEL,
5007 "Deleted feature: %s at %L must be integer",
5008 _(name_msgid), &expr->where);
5011 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5018 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5026 /* Resolve the expressions in an iterator structure. If REAL_OK is
5027 false allow only INTEGER type iterators, otherwise allow REAL types. */
5030 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5032 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5036 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5038 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5043 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5044 "Start expression in DO loop") == FAILURE)
5047 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5048 "End expression in DO loop") == FAILURE)
5051 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5052 "Step expression in DO loop") == FAILURE)
5055 if (iter->step->expr_type == EXPR_CONSTANT)
5057 if ((iter->step->ts.type == BT_INTEGER
5058 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5059 || (iter->step->ts.type == BT_REAL
5060 && mpfr_sgn (iter->step->value.real) == 0))
5062 gfc_error ("Step expression in DO loop at %L cannot be zero",
5063 &iter->step->where);
5068 /* Convert start, end, and step to the same type as var. */
5069 if (iter->start->ts.kind != iter->var->ts.kind
5070 || iter->start->ts.type != iter->var->ts.type)
5071 gfc_convert_type (iter->start, &iter->var->ts, 2);
5073 if (iter->end->ts.kind != iter->var->ts.kind
5074 || iter->end->ts.type != iter->var->ts.type)
5075 gfc_convert_type (iter->end, &iter->var->ts, 2);
5077 if (iter->step->ts.kind != iter->var->ts.kind
5078 || iter->step->ts.type != iter->var->ts.type)
5079 gfc_convert_type (iter->step, &iter->var->ts, 2);
5081 if (iter->start->expr_type == EXPR_CONSTANT
5082 && iter->end->expr_type == EXPR_CONSTANT
5083 && iter->step->expr_type == EXPR_CONSTANT)
5086 if (iter->start->ts.type == BT_INTEGER)
5088 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5089 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5093 sgn = mpfr_sgn (iter->step->value.real);
5094 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5096 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5097 gfc_warning ("DO loop at %L will be executed zero times",
5098 &iter->step->where);
5105 /* Traversal function for find_forall_index. f == 2 signals that
5106 that variable itself is not to be checked - only the references. */
5109 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5111 if (expr->expr_type != EXPR_VARIABLE)
5114 /* A scalar assignment */
5115 if (!expr->ref || *f == 1)
5117 if (expr->symtree->n.sym == sym)
5129 /* Check whether the FORALL index appears in the expression or not.
5130 Returns SUCCESS if SYM is found in EXPR. */
5133 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5135 if (gfc_traverse_expr (expr, sym, forall_index, f))
5142 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5143 to be a scalar INTEGER variable. The subscripts and stride are scalar
5144 INTEGERs, and if stride is a constant it must be nonzero.
5145 Furthermore "A subscript or stride in a forall-triplet-spec shall
5146 not contain a reference to any index-name in the
5147 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5150 resolve_forall_iterators (gfc_forall_iterator *it)
5152 gfc_forall_iterator *iter, *iter2;
5154 for (iter = it; iter; iter = iter->next)
5156 if (gfc_resolve_expr (iter->var) == SUCCESS
5157 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5158 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5161 if (gfc_resolve_expr (iter->start) == SUCCESS
5162 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5163 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5164 &iter->start->where);
5165 if (iter->var->ts.kind != iter->start->ts.kind)
5166 gfc_convert_type (iter->start, &iter->var->ts, 2);
5168 if (gfc_resolve_expr (iter->end) == SUCCESS
5169 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5170 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5172 if (iter->var->ts.kind != iter->end->ts.kind)
5173 gfc_convert_type (iter->end, &iter->var->ts, 2);
5175 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5177 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5178 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5179 &iter->stride->where, "INTEGER");
5181 if (iter->stride->expr_type == EXPR_CONSTANT
5182 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5183 gfc_error ("FORALL stride expression at %L cannot be zero",
5184 &iter->stride->where);
5186 if (iter->var->ts.kind != iter->stride->ts.kind)
5187 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5190 for (iter = it; iter; iter = iter->next)
5191 for (iter2 = iter; iter2; iter2 = iter2->next)
5193 if (find_forall_index (iter2->start,
5194 iter->var->symtree->n.sym, 0) == SUCCESS
5195 || find_forall_index (iter2->end,
5196 iter->var->symtree->n.sym, 0) == SUCCESS
5197 || find_forall_index (iter2->stride,
5198 iter->var->symtree->n.sym, 0) == SUCCESS)
5199 gfc_error ("FORALL index '%s' may not appear in triplet "
5200 "specification at %L", iter->var->symtree->name,
5201 &iter2->start->where);
5206 /* Given a pointer to a symbol that is a derived type, see if it's
5207 inaccessible, i.e. if it's defined in another module and the components are
5208 PRIVATE. The search is recursive if necessary. Returns zero if no
5209 inaccessible components are found, nonzero otherwise. */
5212 derived_inaccessible (gfc_symbol *sym)
5216 if (sym->attr.use_assoc && sym->attr.private_comp)
5219 for (c = sym->components; c; c = c->next)
5221 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.derived))
5229 /* Resolve the argument of a deallocate expression. The expression must be
5230 a pointer or a full array. */
5233 resolve_deallocate_expr (gfc_expr *e)
5235 symbol_attribute attr;
5236 int allocatable, pointer, check_intent_in;
5239 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5240 check_intent_in = 1;
5242 if (gfc_resolve_expr (e) == FAILURE)
5245 if (e->expr_type != EXPR_VARIABLE)
5248 allocatable = e->symtree->n.sym->attr.allocatable;
5249 pointer = e->symtree->n.sym->attr.pointer;
5250 for (ref = e->ref; ref; ref = ref->next)
5253 check_intent_in = 0;
5258 if (ref->u.ar.type != AR_FULL)
5263 allocatable = (ref->u.c.component->as != NULL
5264 && ref->u.c.component->as->type == AS_DEFERRED);
5265 pointer = ref->u.c.component->attr.pointer;
5274 attr = gfc_expr_attr (e);
5276 if (allocatable == 0 && attr.pointer == 0)
5279 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5284 && e->symtree->n.sym->attr.intent == INTENT_IN)
5286 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5287 e->symtree->n.sym->name, &e->where);
5295 /* Returns true if the expression e contains a reference to the symbol sym. */
5297 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5299 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5306 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5308 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5312 /* Given the expression node e for an allocatable/pointer of derived type to be
5313 allocated, get the expression node to be initialized afterwards (needed for
5314 derived types with default initializers, and derived types with allocatable
5315 components that need nullification.) */
5318 expr_to_initialize (gfc_expr *e)
5324 result = gfc_copy_expr (e);
5326 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5327 for (ref = result->ref; ref; ref = ref->next)
5328 if (ref->type == REF_ARRAY && ref->next == NULL)
5330 ref->u.ar.type = AR_FULL;
5332 for (i = 0; i < ref->u.ar.dimen; i++)
5333 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5335 result->rank = ref->u.ar.dimen;
5343 /* Resolve the expression in an ALLOCATE statement, doing the additional
5344 checks to see whether the expression is OK or not. The expression must
5345 have a trailing array reference that gives the size of the array. */
5348 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5350 int i, pointer, allocatable, dimension, check_intent_in;
5351 symbol_attribute attr;
5352 gfc_ref *ref, *ref2;
5359 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5360 check_intent_in = 1;
5362 if (gfc_resolve_expr (e) == FAILURE)
5365 /* Make sure the expression is allocatable or a pointer. If it is
5366 pointer, the next-to-last reference must be a pointer. */
5370 if (e->expr_type != EXPR_VARIABLE)
5373 attr = gfc_expr_attr (e);
5374 pointer = attr.pointer;
5375 dimension = attr.dimension;
5379 allocatable = e->symtree->n.sym->attr.allocatable;
5380 pointer = e->symtree->n.sym->attr.pointer;
5381 dimension = e->symtree->n.sym->attr.dimension;
5383 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5386 check_intent_in = 0;
5391 if (ref->next != NULL)
5396 allocatable = (ref->u.c.component->as != NULL
5397 && ref->u.c.component->as->type == AS_DEFERRED);
5399 pointer = ref->u.c.component->attr.pointer;
5400 dimension = ref->u.c.component->attr.dimension;
5411 if (allocatable == 0 && pointer == 0)
5413 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5419 && e->symtree->n.sym->attr.intent == INTENT_IN)
5421 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5422 e->symtree->n.sym->name, &e->where);
5426 /* Add default initializer for those derived types that need them. */
5427 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
5429 init_st = gfc_get_code ();
5430 init_st->loc = code->loc;
5431 init_st->op = EXEC_INIT_ASSIGN;
5432 init_st->expr1 = expr_to_initialize (e);
5433 init_st->expr2 = init_e;
5434 init_st->next = code->next;
5435 code->next = init_st;
5438 if (pointer && dimension == 0)
5441 /* Make sure the next-to-last reference node is an array specification. */
5443 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5445 gfc_error ("Array specification required in ALLOCATE statement "
5446 "at %L", &e->where);
5450 /* Make sure that the array section reference makes sense in the
5451 context of an ALLOCATE specification. */
5455 for (i = 0; i < ar->dimen; i++)
5457 if (ref2->u.ar.type == AR_ELEMENT)
5460 switch (ar->dimen_type[i])
5466 if (ar->start[i] != NULL
5467 && ar->end[i] != NULL
5468 && ar->stride[i] == NULL)
5471 /* Fall Through... */
5475 gfc_error ("Bad array specification in ALLOCATE statement at %L",
5482 for (a = code->ext.alloc_list; a; a = a->next)
5484 sym = a->expr->symtree->n.sym;
5486 /* TODO - check derived type components. */
5487 if (sym->ts.type == BT_DERIVED)
5490 if ((ar->start[i] != NULL
5491 && gfc_find_sym_in_expr (sym, ar->start[i]))
5492 || (ar->end[i] != NULL
5493 && gfc_find_sym_in_expr (sym, ar->end[i])))
5495 gfc_error ("'%s' must not appear in the array specification at "
5496 "%L in the same ALLOCATE statement where it is "
5497 "itself allocated", sym->name, &ar->where);
5507 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
5509 gfc_expr *stat, *errmsg, *pe, *qe;
5510 gfc_alloc *a, *p, *q;
5512 stat = code->expr1 ? code->expr1 : NULL;
5514 errmsg = code->expr2 ? code->expr2 : NULL;
5516 /* Check the stat variable. */
5519 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
5520 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
5521 stat->symtree->n.sym->name, &stat->where);
5523 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
5524 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
5527 if (stat->ts.type != BT_INTEGER
5528 && !(stat->ref && (stat->ref->type == REF_ARRAY
5529 || stat->ref->type == REF_COMPONENT)))
5530 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
5531 "variable", &stat->where);
5533 for (p = code->ext.alloc_list; p; p = p->next)
5534 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
5535 gfc_error ("Stat-variable at %L shall not be %sd within "
5536 "the same %s statement", &stat->where, fcn, fcn);
5539 /* Check the errmsg variable. */
5543 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
5546 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
5547 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
5548 errmsg->symtree->n.sym->name, &errmsg->where);
5550 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
5551 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
5554 if (errmsg->ts.type != BT_CHARACTER
5556 && (errmsg->ref->type == REF_ARRAY
5557 || errmsg->ref->type == REF_COMPONENT)))
5558 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
5559 "variable", &errmsg->where);
5561 for (p = code->ext.alloc_list; p; p = p->next)
5562 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
5563 gfc_error ("Errmsg-variable at %L shall not be %sd within "
5564 "the same %s statement", &errmsg->where, fcn, fcn);
5567 /* Check that an allocate-object appears only once in the statement.
5568 FIXME: Checking derived types is disabled. */
5569 for (p = code->ext.alloc_list; p; p = p->next)
5572 if ((pe->ref && pe->ref->type != REF_COMPONENT)
5573 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
5575 for (q = p->next; q; q = q->next)
5578 if ((qe->ref && qe->ref->type != REF_COMPONENT)
5579 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
5580 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
5581 gfc_error ("Allocate-object at %L also appears at %L",
5582 &pe->where, &qe->where);
5587 if (strcmp (fcn, "ALLOCATE") == 0)
5589 for (a = code->ext.alloc_list; a; a = a->next)
5590 resolve_allocate_expr (a->expr, code);
5594 for (a = code->ext.alloc_list; a; a = a->next)
5595 resolve_deallocate_expr (a->expr);
5600 /************ SELECT CASE resolution subroutines ************/
5602 /* Callback function for our mergesort variant. Determines interval
5603 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
5604 op1 > op2. Assumes we're not dealing with the default case.
5605 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
5606 There are nine situations to check. */
5609 compare_cases (const gfc_case *op1, const gfc_case *op2)
5613 if (op1->low == NULL) /* op1 = (:L) */
5615 /* op2 = (:N), so overlap. */
5617 /* op2 = (M:) or (M:N), L < M */
5618 if (op2->low != NULL
5619 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5622 else if (op1->high == NULL) /* op1 = (K:) */
5624 /* op2 = (M:), so overlap. */
5626 /* op2 = (:N) or (M:N), K > N */
5627 if (op2->high != NULL
5628 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5631 else /* op1 = (K:L) */
5633 if (op2->low == NULL) /* op2 = (:N), K > N */
5634 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5636 else if (op2->high == NULL) /* op2 = (M:), L < M */
5637 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5639 else /* op2 = (M:N) */
5643 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5646 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5655 /* Merge-sort a double linked case list, detecting overlap in the
5656 process. LIST is the head of the double linked case list before it
5657 is sorted. Returns the head of the sorted list if we don't see any
5658 overlap, or NULL otherwise. */
5661 check_case_overlap (gfc_case *list)
5663 gfc_case *p, *q, *e, *tail;
5664 int insize, nmerges, psize, qsize, cmp, overlap_seen;
5666 /* If the passed list was empty, return immediately. */
5673 /* Loop unconditionally. The only exit from this loop is a return
5674 statement, when we've finished sorting the case list. */
5681 /* Count the number of merges we do in this pass. */
5684 /* Loop while there exists a merge to be done. */
5689 /* Count this merge. */
5692 /* Cut the list in two pieces by stepping INSIZE places
5693 forward in the list, starting from P. */
5696 for (i = 0; i < insize; i++)
5705 /* Now we have two lists. Merge them! */
5706 while (psize > 0 || (qsize > 0 && q != NULL))
5708 /* See from which the next case to merge comes from. */
5711 /* P is empty so the next case must come from Q. */
5716 else if (qsize == 0 || q == NULL)
5725 cmp = compare_cases (p, q);
5728 /* The whole case range for P is less than the
5736 /* The whole case range for Q is greater than
5737 the case range for P. */
5744 /* The cases overlap, or they are the same
5745 element in the list. Either way, we must
5746 issue an error and get the next case from P. */
5747 /* FIXME: Sort P and Q by line number. */
5748 gfc_error ("CASE label at %L overlaps with CASE "
5749 "label at %L", &p->where, &q->where);
5757 /* Add the next element to the merged list. */
5766 /* P has now stepped INSIZE places along, and so has Q. So
5767 they're the same. */
5772 /* If we have done only one merge or none at all, we've
5773 finished sorting the cases. */
5782 /* Otherwise repeat, merging lists twice the size. */
5788 /* Check to see if an expression is suitable for use in a CASE statement.
5789 Makes sure that all case expressions are scalar constants of the same
5790 type. Return FAILURE if anything is wrong. */
5793 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
5795 if (e == NULL) return SUCCESS;
5797 if (e->ts.type != case_expr->ts.type)
5799 gfc_error ("Expression in CASE statement at %L must be of type %s",
5800 &e->where, gfc_basic_typename (case_expr->ts.type));
5804 /* C805 (R808) For a given case-construct, each case-value shall be of
5805 the same type as case-expr. For character type, length differences
5806 are allowed, but the kind type parameters shall be the same. */
5808 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
5810 gfc_error ("Expression in CASE statement at %L must be of kind %d",
5811 &e->where, case_expr->ts.kind);
5815 /* Convert the case value kind to that of case expression kind, if needed.
5816 FIXME: Should a warning be issued? */
5817 if (e->ts.kind != case_expr->ts.kind)
5818 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
5822 gfc_error ("Expression in CASE statement at %L must be scalar",
5831 /* Given a completely parsed select statement, we:
5833 - Validate all expressions and code within the SELECT.
5834 - Make sure that the selection expression is not of the wrong type.
5835 - Make sure that no case ranges overlap.
5836 - Eliminate unreachable cases and unreachable code resulting from
5837 removing case labels.
5839 The standard does allow unreachable cases, e.g. CASE (5:3). But
5840 they are a hassle for code generation, and to prevent that, we just
5841 cut them out here. This is not necessary for overlapping cases
5842 because they are illegal and we never even try to generate code.
5844 We have the additional caveat that a SELECT construct could have
5845 been a computed GOTO in the source code. Fortunately we can fairly
5846 easily work around that here: The case_expr for a "real" SELECT CASE
5847 is in code->expr1, but for a computed GOTO it is in code->expr2. All
5848 we have to do is make sure that the case_expr is a scalar integer
5852 resolve_select (gfc_code *code)
5855 gfc_expr *case_expr;
5856 gfc_case *cp, *default_case, *tail, *head;
5857 int seen_unreachable;
5863 if (code->expr1 == NULL)
5865 /* This was actually a computed GOTO statement. */
5866 case_expr = code->expr2;
5867 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
5868 gfc_error ("Selection expression in computed GOTO statement "
5869 "at %L must be a scalar integer expression",
5872 /* Further checking is not necessary because this SELECT was built
5873 by the compiler, so it should always be OK. Just move the
5874 case_expr from expr2 to expr so that we can handle computed
5875 GOTOs as normal SELECTs from here on. */
5876 code->expr1 = code->expr2;
5881 case_expr = code->expr1;
5883 type = case_expr->ts.type;
5884 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
5886 gfc_error ("Argument of SELECT statement at %L cannot be %s",
5887 &case_expr->where, gfc_typename (&case_expr->ts));
5889 /* Punt. Going on here just produce more garbage error messages. */
5893 if (case_expr->rank != 0)
5895 gfc_error ("Argument of SELECT statement at %L must be a scalar "
5896 "expression", &case_expr->where);
5902 /* PR 19168 has a long discussion concerning a mismatch of the kinds
5903 of the SELECT CASE expression and its CASE values. Walk the lists
5904 of case values, and if we find a mismatch, promote case_expr to
5905 the appropriate kind. */
5907 if (type == BT_LOGICAL || type == BT_INTEGER)
5909 for (body = code->block; body; body = body->block)
5911 /* Walk the case label list. */
5912 for (cp = body->ext.case_list; cp; cp = cp->next)
5914 /* Intercept the DEFAULT case. It does not have a kind. */
5915 if (cp->low == NULL && cp->high == NULL)
5918 /* Unreachable case ranges are discarded, so ignore. */
5919 if (cp->low != NULL && cp->high != NULL
5920 && cp->low != cp->high
5921 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
5924 /* FIXME: Should a warning be issued? */
5926 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
5927 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
5929 if (cp->high != NULL
5930 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
5931 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
5936 /* Assume there is no DEFAULT case. */
5937 default_case = NULL;
5942 for (body = code->block; body; body = body->block)
5944 /* Assume the CASE list is OK, and all CASE labels can be matched. */
5946 seen_unreachable = 0;
5948 /* Walk the case label list, making sure that all case labels
5950 for (cp = body->ext.case_list; cp; cp = cp->next)
5952 /* Count the number of cases in the whole construct. */
5955 /* Intercept the DEFAULT case. */
5956 if (cp->low == NULL && cp->high == NULL)
5958 if (default_case != NULL)
5960 gfc_error ("The DEFAULT CASE at %L cannot be followed "
5961 "by a second DEFAULT CASE at %L",
5962 &default_case->where, &cp->where);
5973 /* Deal with single value cases and case ranges. Errors are
5974 issued from the validation function. */
5975 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
5976 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
5982 if (type == BT_LOGICAL
5983 && ((cp->low == NULL || cp->high == NULL)
5984 || cp->low != cp->high))
5986 gfc_error ("Logical range in CASE statement at %L is not "
5987 "allowed", &cp->low->where);
5992 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
5995 value = cp->low->value.logical == 0 ? 2 : 1;
5996 if (value & seen_logical)
5998 gfc_error ("constant logical value in CASE statement "
5999 "is repeated at %L",
6004 seen_logical |= value;
6007 if (cp->low != NULL && cp->high != NULL
6008 && cp->low != cp->high
6009 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6011 if (gfc_option.warn_surprising)
6012 gfc_warning ("Range specification at %L can never "
6013 "be matched", &cp->where);
6015 cp->unreachable = 1;
6016 seen_unreachable = 1;
6020 /* If the case range can be matched, it can also overlap with
6021 other cases. To make sure it does not, we put it in a
6022 double linked list here. We sort that with a merge sort
6023 later on to detect any overlapping cases. */
6027 head->right = head->left = NULL;
6032 tail->right->left = tail;
6039 /* It there was a failure in the previous case label, give up
6040 for this case label list. Continue with the next block. */
6044 /* See if any case labels that are unreachable have been seen.
6045 If so, we eliminate them. This is a bit of a kludge because
6046 the case lists for a single case statement (label) is a
6047 single forward linked lists. */
6048 if (seen_unreachable)
6050 /* Advance until the first case in the list is reachable. */
6051 while (body->ext.case_list != NULL
6052 && body->ext.case_list->unreachable)
6054 gfc_case *n = body->ext.case_list;
6055 body->ext.case_list = body->ext.case_list->next;
6057 gfc_free_case_list (n);
6060 /* Strip all other unreachable cases. */
6061 if (body->ext.case_list)
6063 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6065 if (cp->next->unreachable)
6067 gfc_case *n = cp->next;
6068 cp->next = cp->next->next;
6070 gfc_free_case_list (n);
6077 /* See if there were overlapping cases. If the check returns NULL,
6078 there was overlap. In that case we don't do anything. If head
6079 is non-NULL, we prepend the DEFAULT case. The sorted list can
6080 then used during code generation for SELECT CASE constructs with
6081 a case expression of a CHARACTER type. */
6084 head = check_case_overlap (head);
6086 /* Prepend the default_case if it is there. */
6087 if (head != NULL && default_case)
6089 default_case->left = NULL;
6090 default_case->right = head;
6091 head->left = default_case;
6095 /* Eliminate dead blocks that may be the result if we've seen
6096 unreachable case labels for a block. */
6097 for (body = code; body && body->block; body = body->block)
6099 if (body->block->ext.case_list == NULL)
6101 /* Cut the unreachable block from the code chain. */
6102 gfc_code *c = body->block;
6103 body->block = c->block;
6105 /* Kill the dead block, but not the blocks below it. */
6107 gfc_free_statements (c);
6111 /* More than two cases is legal but insane for logical selects.
6112 Issue a warning for it. */
6113 if (gfc_option.warn_surprising && type == BT_LOGICAL
6115 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6120 /* Resolve a transfer statement. This is making sure that:
6121 -- a derived type being transferred has only non-pointer components
6122 -- a derived type being transferred doesn't have private components, unless
6123 it's being transferred from the module where the type was defined
6124 -- we're not trying to transfer a whole assumed size array. */
6127 resolve_transfer (gfc_code *code)
6136 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6139 sym = exp->symtree->n.sym;
6142 /* Go to actual component transferred. */
6143 for (ref = code->expr1->ref; ref; ref = ref->next)
6144 if (ref->type == REF_COMPONENT)
6145 ts = &ref->u.c.component->ts;
6147 if (ts->type == BT_DERIVED)
6149 /* Check that transferred derived type doesn't contain POINTER
6151 if (ts->derived->attr.pointer_comp)
6153 gfc_error ("Data transfer element at %L cannot have "
6154 "POINTER components", &code->loc);
6158 if (ts->derived->attr.alloc_comp)
6160 gfc_error ("Data transfer element at %L cannot have "
6161 "ALLOCATABLE components", &code->loc);
6165 if (derived_inaccessible (ts->derived))
6167 gfc_error ("Data transfer element at %L cannot have "
6168 "PRIVATE components",&code->loc);
6173 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6174 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6176 gfc_error ("Data transfer element at %L cannot be a full reference to "
6177 "an assumed-size array", &code->loc);
6183 /*********** Toplevel code resolution subroutines ***********/
6185 /* Find the set of labels that are reachable from this block. We also
6186 record the last statement in each block. */
6189 find_reachable_labels (gfc_code *block)
6196 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6198 /* Collect labels in this block. We don't keep those corresponding
6199 to END {IF|SELECT}, these are checked in resolve_branch by going
6200 up through the code_stack. */
6201 for (c = block; c; c = c->next)
6203 if (c->here && c->op != EXEC_END_BLOCK)
6204 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6207 /* Merge with labels from parent block. */
6210 gcc_assert (cs_base->prev->reachable_labels);
6211 bitmap_ior_into (cs_base->reachable_labels,
6212 cs_base->prev->reachable_labels);
6216 /* Given a branch to a label, see if the branch is conforming.
6217 The code node describes where the branch is located. */
6220 resolve_branch (gfc_st_label *label, gfc_code *code)
6227 /* Step one: is this a valid branching target? */
6229 if (label->defined == ST_LABEL_UNKNOWN)
6231 gfc_error ("Label %d referenced at %L is never defined", label->value,
6236 if (label->defined != ST_LABEL_TARGET)
6238 gfc_error ("Statement at %L is not a valid branch target statement "
6239 "for the branch statement at %L", &label->where, &code->loc);
6243 /* Step two: make sure this branch is not a branch to itself ;-) */
6245 if (code->here == label)
6247 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6251 /* Step three: See if the label is in the same block as the
6252 branching statement. The hard work has been done by setting up
6253 the bitmap reachable_labels. */
6255 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6258 /* Step four: If we haven't found the label in the bitmap, it may
6259 still be the label of the END of the enclosing block, in which
6260 case we find it by going up the code_stack. */
6262 for (stack = cs_base; stack; stack = stack->prev)
6263 if (stack->current->next && stack->current->next->here == label)
6268 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6272 /* The label is not in an enclosing block, so illegal. This was
6273 allowed in Fortran 66, so we allow it as extension. No
6274 further checks are necessary in this case. */
6275 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6276 "as the GOTO statement at %L", &label->where,
6282 /* Check whether EXPR1 has the same shape as EXPR2. */
6285 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6287 mpz_t shape[GFC_MAX_DIMENSIONS];
6288 mpz_t shape2[GFC_MAX_DIMENSIONS];
6289 gfc_try result = FAILURE;
6292 /* Compare the rank. */
6293 if (expr1->rank != expr2->rank)
6296 /* Compare the size of each dimension. */
6297 for (i=0; i<expr1->rank; i++)
6299 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6302 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6305 if (mpz_cmp (shape[i], shape2[i]))
6309 /* When either of the two expression is an assumed size array, we
6310 ignore the comparison of dimension sizes. */
6315 for (i--; i >= 0; i--)
6317 mpz_clear (shape[i]);
6318 mpz_clear (shape2[i]);
6324 /* Check whether a WHERE assignment target or a WHERE mask expression
6325 has the same shape as the outmost WHERE mask expression. */
6328 resolve_where (gfc_code *code, gfc_expr *mask)
6334 cblock = code->block;
6336 /* Store the first WHERE mask-expr of the WHERE statement or construct.
6337 In case of nested WHERE, only the outmost one is stored. */
6338 if (mask == NULL) /* outmost WHERE */
6340 else /* inner WHERE */
6347 /* Check if the mask-expr has a consistent shape with the
6348 outmost WHERE mask-expr. */
6349 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
6350 gfc_error ("WHERE mask at %L has inconsistent shape",
6351 &cblock->expr1->where);
6354 /* the assignment statement of a WHERE statement, or the first
6355 statement in where-body-construct of a WHERE construct */
6356 cnext = cblock->next;
6361 /* WHERE assignment statement */
6364 /* Check shape consistent for WHERE assignment target. */
6365 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
6366 gfc_error ("WHERE assignment target at %L has "
6367 "inconsistent shape", &cnext->expr1->where);
6371 case EXEC_ASSIGN_CALL:
6372 resolve_call (cnext);
6373 if (!cnext->resolved_sym->attr.elemental)
6374 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6375 &cnext->ext.actual->expr->where);
6378 /* WHERE or WHERE construct is part of a where-body-construct */
6380 resolve_where (cnext, e);
6384 gfc_error ("Unsupported statement inside WHERE at %L",
6387 /* the next statement within the same where-body-construct */
6388 cnext = cnext->next;
6390 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6391 cblock = cblock->block;
6396 /* Resolve assignment in FORALL construct.
6397 NVAR is the number of FORALL index variables, and VAR_EXPR records the
6398 FORALL index variables. */
6401 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
6405 for (n = 0; n < nvar; n++)
6407 gfc_symbol *forall_index;
6409 forall_index = var_expr[n]->symtree->n.sym;
6411 /* Check whether the assignment target is one of the FORALL index
6413 if ((code->expr1->expr_type == EXPR_VARIABLE)
6414 && (code->expr1->symtree->n.sym == forall_index))
6415 gfc_error ("Assignment to a FORALL index variable at %L",
6416 &code->expr1->where);
6419 /* If one of the FORALL index variables doesn't appear in the
6420 assignment variable, then there could be a many-to-one
6421 assignment. Emit a warning rather than an error because the
6422 mask could be resolving this problem. */
6423 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
6424 gfc_warning ("The FORALL with index '%s' is not used on the "
6425 "left side of the assignment at %L and so might "
6426 "cause multiple assignment to this object",
6427 var_expr[n]->symtree->name, &code->expr1->where);
6433 /* Resolve WHERE statement in FORALL construct. */
6436 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
6437 gfc_expr **var_expr)
6442 cblock = code->block;
6445 /* the assignment statement of a WHERE statement, or the first
6446 statement in where-body-construct of a WHERE construct */
6447 cnext = cblock->next;
6452 /* WHERE assignment statement */
6454 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
6457 /* WHERE operator assignment statement */
6458 case EXEC_ASSIGN_CALL:
6459 resolve_call (cnext);
6460 if (!cnext->resolved_sym->attr.elemental)
6461 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6462 &cnext->ext.actual->expr->where);
6465 /* WHERE or WHERE construct is part of a where-body-construct */
6467 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
6471 gfc_error ("Unsupported statement inside WHERE at %L",
6474 /* the next statement within the same where-body-construct */
6475 cnext = cnext->next;
6477 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6478 cblock = cblock->block;
6483 /* Traverse the FORALL body to check whether the following errors exist:
6484 1. For assignment, check if a many-to-one assignment happens.
6485 2. For WHERE statement, check the WHERE body to see if there is any
6486 many-to-one assignment. */
6489 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
6493 c = code->block->next;
6499 case EXEC_POINTER_ASSIGN:
6500 gfc_resolve_assign_in_forall (c, nvar, var_expr);
6503 case EXEC_ASSIGN_CALL:
6507 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
6508 there is no need to handle it here. */
6512 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
6517 /* The next statement in the FORALL body. */
6523 /* Counts the number of iterators needed inside a forall construct, including
6524 nested forall constructs. This is used to allocate the needed memory
6525 in gfc_resolve_forall. */
6528 gfc_count_forall_iterators (gfc_code *code)
6530 int max_iters, sub_iters, current_iters;
6531 gfc_forall_iterator *fa;
6533 gcc_assert(code->op == EXEC_FORALL);
6537 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6540 code = code->block->next;
6544 if (code->op == EXEC_FORALL)
6546 sub_iters = gfc_count_forall_iterators (code);
6547 if (sub_iters > max_iters)
6548 max_iters = sub_iters;
6553 return current_iters + max_iters;
6557 /* Given a FORALL construct, first resolve the FORALL iterator, then call
6558 gfc_resolve_forall_body to resolve the FORALL body. */
6561 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
6563 static gfc_expr **var_expr;
6564 static int total_var = 0;
6565 static int nvar = 0;
6567 gfc_forall_iterator *fa;
6572 /* Start to resolve a FORALL construct */
6573 if (forall_save == 0)
6575 /* Count the total number of FORALL index in the nested FORALL
6576 construct in order to allocate the VAR_EXPR with proper size. */
6577 total_var = gfc_count_forall_iterators (code);
6579 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
6580 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
6583 /* The information about FORALL iterator, including FORALL index start, end
6584 and stride. The FORALL index can not appear in start, end or stride. */
6585 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6587 /* Check if any outer FORALL index name is the same as the current
6589 for (i = 0; i < nvar; i++)
6591 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
6593 gfc_error ("An outer FORALL construct already has an index "
6594 "with this name %L", &fa->var->where);
6598 /* Record the current FORALL index. */
6599 var_expr[nvar] = gfc_copy_expr (fa->var);
6603 /* No memory leak. */
6604 gcc_assert (nvar <= total_var);
6607 /* Resolve the FORALL body. */
6608 gfc_resolve_forall_body (code, nvar, var_expr);
6610 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
6611 gfc_resolve_blocks (code->block, ns);
6615 /* Free only the VAR_EXPRs allocated in this frame. */
6616 for (i = nvar; i < tmp; i++)
6617 gfc_free_expr (var_expr[i]);
6621 /* We are in the outermost FORALL construct. */
6622 gcc_assert (forall_save == 0);
6624 /* VAR_EXPR is not needed any more. */
6625 gfc_free (var_expr);
6631 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
6634 static void resolve_code (gfc_code *, gfc_namespace *);
6637 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
6641 for (; b; b = b->block)
6643 t = gfc_resolve_expr (b->expr1);
6644 if (gfc_resolve_expr (b->expr2) == FAILURE)
6650 if (t == SUCCESS && b->expr1 != NULL
6651 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
6652 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6659 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
6660 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
6665 resolve_branch (b->label1, b);
6678 case EXEC_OMP_ATOMIC:
6679 case EXEC_OMP_CRITICAL:
6681 case EXEC_OMP_MASTER:
6682 case EXEC_OMP_ORDERED:
6683 case EXEC_OMP_PARALLEL:
6684 case EXEC_OMP_PARALLEL_DO:
6685 case EXEC_OMP_PARALLEL_SECTIONS:
6686 case EXEC_OMP_PARALLEL_WORKSHARE:
6687 case EXEC_OMP_SECTIONS:
6688 case EXEC_OMP_SINGLE:
6690 case EXEC_OMP_TASKWAIT:
6691 case EXEC_OMP_WORKSHARE:
6695 gfc_internal_error ("resolve_block(): Bad block type");
6698 resolve_code (b->next, ns);
6703 /* Does everything to resolve an ordinary assignment. Returns true
6704 if this is an interface assignment. */
6706 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
6716 if (gfc_extend_assign (code, ns) == SUCCESS)
6718 lhs = code->ext.actual->expr;
6719 rhs = code->ext.actual->next->expr;
6720 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6722 gfc_error ("Subroutine '%s' called instead of assignment at "
6723 "%L must be PURE", code->symtree->n.sym->name,
6728 /* Make a temporary rhs when there is a default initializer
6729 and rhs is the same symbol as the lhs. */
6730 if (rhs->expr_type == EXPR_VARIABLE
6731 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6732 && has_default_initializer (rhs->symtree->n.sym->ts.derived)
6733 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6734 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6743 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
6744 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
6745 &code->loc) == FAILURE)
6748 /* Handle the case of a BOZ literal on the RHS. */
6749 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
6752 if (gfc_option.warn_surprising)
6753 gfc_warning ("BOZ literal at %L is bitwise transferred "
6754 "non-integer symbol '%s'", &code->loc,
6755 lhs->symtree->n.sym->name);
6757 if (!gfc_convert_boz (rhs, &lhs->ts))
6759 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
6761 if (rc == ARITH_UNDERFLOW)
6762 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
6763 ". This check can be disabled with the option "
6764 "-fno-range-check", &rhs->where);
6765 else if (rc == ARITH_OVERFLOW)
6766 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
6767 ". This check can be disabled with the option "
6768 "-fno-range-check", &rhs->where);
6769 else if (rc == ARITH_NAN)
6770 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
6771 ". This check can be disabled with the option "
6772 "-fno-range-check", &rhs->where);
6778 if (lhs->ts.type == BT_CHARACTER
6779 && gfc_option.warn_character_truncation)
6781 if (lhs->ts.cl != NULL
6782 && lhs->ts.cl->length != NULL
6783 && lhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6784 llen = mpz_get_si (lhs->ts.cl->length->value.integer);
6786 if (rhs->expr_type == EXPR_CONSTANT)
6787 rlen = rhs->value.character.length;
6789 else if (rhs->ts.cl != NULL
6790 && rhs->ts.cl->length != NULL
6791 && rhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6792 rlen = mpz_get_si (rhs->ts.cl->length->value.integer);
6794 if (rlen && llen && rlen > llen)
6795 gfc_warning_now ("CHARACTER expression will be truncated "
6796 "in assignment (%d/%d) at %L",
6797 llen, rlen, &code->loc);
6800 /* Ensure that a vector index expression for the lvalue is evaluated
6801 to a temporary if the lvalue symbol is referenced in it. */
6804 for (ref = lhs->ref; ref; ref= ref->next)
6805 if (ref->type == REF_ARRAY)
6807 for (n = 0; n < ref->u.ar.dimen; n++)
6808 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
6809 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
6810 ref->u.ar.start[n]))
6812 = gfc_get_parentheses (ref->u.ar.start[n]);
6816 if (gfc_pure (NULL))
6818 if (gfc_impure_variable (lhs->symtree->n.sym))
6820 gfc_error ("Cannot assign to variable '%s' in PURE "
6822 lhs->symtree->n.sym->name,
6827 if (lhs->ts.type == BT_DERIVED
6828 && lhs->expr_type == EXPR_VARIABLE
6829 && lhs->ts.derived->attr.pointer_comp
6830 && gfc_impure_variable (rhs->symtree->n.sym))
6832 gfc_error ("The impure variable at %L is assigned to "
6833 "a derived type variable with a POINTER "
6834 "component in a PURE procedure (12.6)",
6840 gfc_check_assign (lhs, rhs, 1);
6844 /* Given a block of code, recursively resolve everything pointed to by this
6848 resolve_code (gfc_code *code, gfc_namespace *ns)
6850 int omp_workshare_save;
6855 frame.prev = cs_base;
6859 find_reachable_labels (code);
6861 for (; code; code = code->next)
6863 frame.current = code;
6864 forall_save = forall_flag;
6866 if (code->op == EXEC_FORALL)
6869 gfc_resolve_forall (code, ns, forall_save);
6872 else if (code->block)
6874 omp_workshare_save = -1;
6877 case EXEC_OMP_PARALLEL_WORKSHARE:
6878 omp_workshare_save = omp_workshare_flag;
6879 omp_workshare_flag = 1;
6880 gfc_resolve_omp_parallel_blocks (code, ns);
6882 case EXEC_OMP_PARALLEL:
6883 case EXEC_OMP_PARALLEL_DO:
6884 case EXEC_OMP_PARALLEL_SECTIONS:
6886 omp_workshare_save = omp_workshare_flag;
6887 omp_workshare_flag = 0;
6888 gfc_resolve_omp_parallel_blocks (code, ns);
6891 gfc_resolve_omp_do_blocks (code, ns);
6893 case EXEC_OMP_WORKSHARE:
6894 omp_workshare_save = omp_workshare_flag;
6895 omp_workshare_flag = 1;
6898 gfc_resolve_blocks (code->block, ns);
6902 if (omp_workshare_save != -1)
6903 omp_workshare_flag = omp_workshare_save;
6907 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
6908 t = gfc_resolve_expr (code->expr1);
6909 forall_flag = forall_save;
6911 if (gfc_resolve_expr (code->expr2) == FAILURE)
6917 case EXEC_END_BLOCK:
6927 /* Keep track of which entry we are up to. */
6928 current_entry_id = code->ext.entry->id;
6932 resolve_where (code, NULL);
6936 if (code->expr1 != NULL)
6938 if (code->expr1->ts.type != BT_INTEGER)
6939 gfc_error ("ASSIGNED GOTO statement at %L requires an "
6940 "INTEGER variable", &code->expr1->where);
6941 else if (code->expr1->symtree->n.sym->attr.assign != 1)
6942 gfc_error ("Variable '%s' has not been assigned a target "
6943 "label at %L", code->expr1->symtree->n.sym->name,
6944 &code->expr1->where);
6947 resolve_branch (code->label1, code);
6951 if (code->expr1 != NULL
6952 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
6953 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
6954 "INTEGER return specifier", &code->expr1->where);
6957 case EXEC_INIT_ASSIGN:
6958 case EXEC_END_PROCEDURE:
6965 if (resolve_ordinary_assign (code, ns))
6970 case EXEC_LABEL_ASSIGN:
6971 if (code->label1->defined == ST_LABEL_UNKNOWN)
6972 gfc_error ("Label %d referenced at %L is never defined",
6973 code->label1->value, &code->label1->where);
6975 && (code->expr1->expr_type != EXPR_VARIABLE
6976 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
6977 || code->expr1->symtree->n.sym->ts.kind
6978 != gfc_default_integer_kind
6979 || code->expr1->symtree->n.sym->as != NULL))
6980 gfc_error ("ASSIGN statement at %L requires a scalar "
6981 "default INTEGER variable", &code->expr1->where);
6984 case EXEC_POINTER_ASSIGN:
6988 gfc_check_pointer_assign (code->expr1, code->expr2);
6991 case EXEC_ARITHMETIC_IF:
6993 && code->expr1->ts.type != BT_INTEGER
6994 && code->expr1->ts.type != BT_REAL)
6995 gfc_error ("Arithmetic IF statement at %L requires a numeric "
6996 "expression", &code->expr1->where);
6998 resolve_branch (code->label1, code);
6999 resolve_branch (code->label2, code);
7000 resolve_branch (code->label3, code);
7004 if (t == SUCCESS && code->expr1 != NULL
7005 && (code->expr1->ts.type != BT_LOGICAL
7006 || code->expr1->rank != 0))
7007 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7008 &code->expr1->where);
7013 resolve_call (code);
7017 resolve_typebound_call (code);
7021 resolve_ppc_call (code);
7025 /* Select is complicated. Also, a SELECT construct could be
7026 a transformed computed GOTO. */
7027 resolve_select (code);
7031 if (code->ext.iterator != NULL)
7033 gfc_iterator *iter = code->ext.iterator;
7034 if (gfc_resolve_iterator (iter, true) != FAILURE)
7035 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7040 if (code->expr1 == NULL)
7041 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7043 && (code->expr1->rank != 0
7044 || code->expr1->ts.type != BT_LOGICAL))
7045 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7046 "a scalar LOGICAL expression", &code->expr1->where);
7051 resolve_allocate_deallocate (code, "ALLOCATE");
7055 case EXEC_DEALLOCATE:
7057 resolve_allocate_deallocate (code, "DEALLOCATE");
7062 if (gfc_resolve_open (code->ext.open) == FAILURE)
7065 resolve_branch (code->ext.open->err, code);
7069 if (gfc_resolve_close (code->ext.close) == FAILURE)
7072 resolve_branch (code->ext.close->err, code);
7075 case EXEC_BACKSPACE:
7079 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7082 resolve_branch (code->ext.filepos->err, code);
7086 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7089 resolve_branch (code->ext.inquire->err, code);
7093 gcc_assert (code->ext.inquire != NULL);
7094 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7097 resolve_branch (code->ext.inquire->err, code);
7101 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7104 resolve_branch (code->ext.wait->err, code);
7105 resolve_branch (code->ext.wait->end, code);
7106 resolve_branch (code->ext.wait->eor, code);
7111 if (gfc_resolve_dt (code->ext.dt) == FAILURE)
7114 resolve_branch (code->ext.dt->err, code);
7115 resolve_branch (code->ext.dt->end, code);
7116 resolve_branch (code->ext.dt->eor, code);
7120 resolve_transfer (code);
7124 resolve_forall_iterators (code->ext.forall_iterator);
7126 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7127 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7128 "expression", &code->expr1->where);
7131 case EXEC_OMP_ATOMIC:
7132 case EXEC_OMP_BARRIER:
7133 case EXEC_OMP_CRITICAL:
7134 case EXEC_OMP_FLUSH:
7136 case EXEC_OMP_MASTER:
7137 case EXEC_OMP_ORDERED:
7138 case EXEC_OMP_SECTIONS:
7139 case EXEC_OMP_SINGLE:
7140 case EXEC_OMP_TASKWAIT:
7141 case EXEC_OMP_WORKSHARE:
7142 gfc_resolve_omp_directive (code, ns);
7145 case EXEC_OMP_PARALLEL:
7146 case EXEC_OMP_PARALLEL_DO:
7147 case EXEC_OMP_PARALLEL_SECTIONS:
7148 case EXEC_OMP_PARALLEL_WORKSHARE:
7150 omp_workshare_save = omp_workshare_flag;
7151 omp_workshare_flag = 0;
7152 gfc_resolve_omp_directive (code, ns);
7153 omp_workshare_flag = omp_workshare_save;
7157 gfc_internal_error ("resolve_code(): Bad statement code");
7161 cs_base = frame.prev;
7165 /* Resolve initial values and make sure they are compatible with
7169 resolve_values (gfc_symbol *sym)
7171 if (sym->value == NULL)
7174 if (gfc_resolve_expr (sym->value) == FAILURE)
7177 gfc_check_assign_symbol (sym, sym->value);
7181 /* Verify the binding labels for common blocks that are BIND(C). The label
7182 for a BIND(C) common block must be identical in all scoping units in which
7183 the common block is declared. Further, the binding label can not collide
7184 with any other global entity in the program. */
7187 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7189 if (comm_block_tree->n.common->is_bind_c == 1)
7191 gfc_gsymbol *binding_label_gsym;
7192 gfc_gsymbol *comm_name_gsym;
7194 /* See if a global symbol exists by the common block's name. It may
7195 be NULL if the common block is use-associated. */
7196 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7197 comm_block_tree->n.common->name);
7198 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7199 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7200 "with the global entity '%s' at %L",
7201 comm_block_tree->n.common->binding_label,
7202 comm_block_tree->n.common->name,
7203 &(comm_block_tree->n.common->where),
7204 comm_name_gsym->name, &(comm_name_gsym->where));
7205 else if (comm_name_gsym != NULL
7206 && strcmp (comm_name_gsym->name,
7207 comm_block_tree->n.common->name) == 0)
7209 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7211 if (comm_name_gsym->binding_label == NULL)
7212 /* No binding label for common block stored yet; save this one. */
7213 comm_name_gsym->binding_label =
7214 comm_block_tree->n.common->binding_label;
7216 if (strcmp (comm_name_gsym->binding_label,
7217 comm_block_tree->n.common->binding_label) != 0)
7219 /* Common block names match but binding labels do not. */
7220 gfc_error ("Binding label '%s' for common block '%s' at %L "
7221 "does not match the binding label '%s' for common "
7223 comm_block_tree->n.common->binding_label,
7224 comm_block_tree->n.common->name,
7225 &(comm_block_tree->n.common->where),
7226 comm_name_gsym->binding_label,
7227 comm_name_gsym->name,
7228 &(comm_name_gsym->where));
7233 /* There is no binding label (NAME="") so we have nothing further to
7234 check and nothing to add as a global symbol for the label. */
7235 if (comm_block_tree->n.common->binding_label[0] == '\0' )
7238 binding_label_gsym =
7239 gfc_find_gsymbol (gfc_gsym_root,
7240 comm_block_tree->n.common->binding_label);
7241 if (binding_label_gsym == NULL)
7243 /* Need to make a global symbol for the binding label to prevent
7244 it from colliding with another. */
7245 binding_label_gsym =
7246 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
7247 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
7248 binding_label_gsym->type = GSYM_COMMON;
7252 /* If comm_name_gsym is NULL, the name common block is use
7253 associated and the name could be colliding. */
7254 if (binding_label_gsym->type != GSYM_COMMON)
7255 gfc_error ("Binding label '%s' for common block '%s' at %L "
7256 "collides with the global entity '%s' at %L",
7257 comm_block_tree->n.common->binding_label,
7258 comm_block_tree->n.common->name,
7259 &(comm_block_tree->n.common->where),
7260 binding_label_gsym->name,
7261 &(binding_label_gsym->where));
7262 else if (comm_name_gsym != NULL
7263 && (strcmp (binding_label_gsym->name,
7264 comm_name_gsym->binding_label) != 0)
7265 && (strcmp (binding_label_gsym->sym_name,
7266 comm_name_gsym->name) != 0))
7267 gfc_error ("Binding label '%s' for common block '%s' at %L "
7268 "collides with global entity '%s' at %L",
7269 binding_label_gsym->name, binding_label_gsym->sym_name,
7270 &(comm_block_tree->n.common->where),
7271 comm_name_gsym->name, &(comm_name_gsym->where));
7279 /* Verify any BIND(C) derived types in the namespace so we can report errors
7280 for them once, rather than for each variable declared of that type. */
7283 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
7285 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
7286 && derived_sym->attr.is_bind_c == 1)
7287 verify_bind_c_derived_type (derived_sym);
7293 /* Verify that any binding labels used in a given namespace do not collide
7294 with the names or binding labels of any global symbols. */
7297 gfc_verify_binding_labels (gfc_symbol *sym)
7301 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
7302 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
7304 gfc_gsymbol *bind_c_sym;
7306 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
7307 if (bind_c_sym != NULL
7308 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
7310 if (sym->attr.if_source == IFSRC_DECL
7311 && (bind_c_sym->type != GSYM_SUBROUTINE
7312 && bind_c_sym->type != GSYM_FUNCTION)
7313 && ((sym->attr.contained == 1
7314 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
7315 || (sym->attr.use_assoc == 1
7316 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
7318 /* Make sure global procedures don't collide with anything. */
7319 gfc_error ("Binding label '%s' at %L collides with the global "
7320 "entity '%s' at %L", sym->binding_label,
7321 &(sym->declared_at), bind_c_sym->name,
7322 &(bind_c_sym->where));
7325 else if (sym->attr.contained == 0
7326 && (sym->attr.if_source == IFSRC_IFBODY
7327 && sym->attr.flavor == FL_PROCEDURE)
7328 && (bind_c_sym->sym_name != NULL
7329 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
7331 /* Make sure procedures in interface bodies don't collide. */
7332 gfc_error ("Binding label '%s' in interface body at %L collides "
7333 "with the global entity '%s' at %L",
7335 &(sym->declared_at), bind_c_sym->name,
7336 &(bind_c_sym->where));
7339 else if (sym->attr.contained == 0
7340 && sym->attr.if_source == IFSRC_UNKNOWN)
7341 if ((sym->attr.use_assoc && bind_c_sym->mod_name
7342 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
7343 || sym->attr.use_assoc == 0)
7345 gfc_error ("Binding label '%s' at %L collides with global "
7346 "entity '%s' at %L", sym->binding_label,
7347 &(sym->declared_at), bind_c_sym->name,
7348 &(bind_c_sym->where));
7353 /* Clear the binding label to prevent checking multiple times. */
7354 sym->binding_label[0] = '\0';
7356 else if (bind_c_sym == NULL)
7358 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
7359 bind_c_sym->where = sym->declared_at;
7360 bind_c_sym->sym_name = sym->name;
7362 if (sym->attr.use_assoc == 1)
7363 bind_c_sym->mod_name = sym->module;
7365 if (sym->ns->proc_name != NULL)
7366 bind_c_sym->mod_name = sym->ns->proc_name->name;
7368 if (sym->attr.contained == 0)
7370 if (sym->attr.subroutine)
7371 bind_c_sym->type = GSYM_SUBROUTINE;
7372 else if (sym->attr.function)
7373 bind_c_sym->type = GSYM_FUNCTION;
7381 /* Resolve an index expression. */
7384 resolve_index_expr (gfc_expr *e)
7386 if (gfc_resolve_expr (e) == FAILURE)
7389 if (gfc_simplify_expr (e, 0) == FAILURE)
7392 if (gfc_specification_expr (e) == FAILURE)
7398 /* Resolve a charlen structure. */
7401 resolve_charlen (gfc_charlen *cl)
7410 specification_expr = 1;
7412 if (resolve_index_expr (cl->length) == FAILURE)
7414 specification_expr = 0;
7418 /* "If the character length parameter value evaluates to a negative
7419 value, the length of character entities declared is zero." */
7420 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
7422 gfc_warning_now ("CHARACTER variable has zero length at %L",
7423 &cl->length->where);
7424 gfc_replace_expr (cl->length, gfc_int_expr (0));
7427 /* Check that the character length is not too large. */
7428 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
7429 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
7430 && cl->length->ts.type == BT_INTEGER
7431 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
7433 gfc_error ("String length at %L is too large", &cl->length->where);
7441 /* Test for non-constant shape arrays. */
7444 is_non_constant_shape_array (gfc_symbol *sym)
7450 not_constant = false;
7451 if (sym->as != NULL)
7453 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
7454 has not been simplified; parameter array references. Do the
7455 simplification now. */
7456 for (i = 0; i < sym->as->rank; i++)
7458 e = sym->as->lower[i];
7459 if (e && (resolve_index_expr (e) == FAILURE
7460 || !gfc_is_constant_expr (e)))
7461 not_constant = true;
7463 e = sym->as->upper[i];
7464 if (e && (resolve_index_expr (e) == FAILURE
7465 || !gfc_is_constant_expr (e)))
7466 not_constant = true;
7469 return not_constant;
7472 /* Given a symbol and an initialization expression, add code to initialize
7473 the symbol to the function entry. */
7475 build_init_assign (gfc_symbol *sym, gfc_expr *init)
7479 gfc_namespace *ns = sym->ns;
7481 /* Search for the function namespace if this is a contained
7482 function without an explicit result. */
7483 if (sym->attr.function && sym == sym->result
7484 && sym->name != sym->ns->proc_name->name)
7487 for (;ns; ns = ns->sibling)
7488 if (strcmp (ns->proc_name->name, sym->name) == 0)
7494 gfc_free_expr (init);
7498 /* Build an l-value expression for the result. */
7499 lval = gfc_lval_expr_from_sym (sym);
7501 /* Add the code at scope entry. */
7502 init_st = gfc_get_code ();
7503 init_st->next = ns->code;
7506 /* Assign the default initializer to the l-value. */
7507 init_st->loc = sym->declared_at;
7508 init_st->op = EXEC_INIT_ASSIGN;
7509 init_st->expr1 = lval;
7510 init_st->expr2 = init;
7513 /* Assign the default initializer to a derived type variable or result. */
7516 apply_default_init (gfc_symbol *sym)
7518 gfc_expr *init = NULL;
7520 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7523 if (sym->ts.type == BT_DERIVED && sym->ts.derived)
7524 init = gfc_default_initializer (&sym->ts);
7529 build_init_assign (sym, init);
7532 /* Build an initializer for a local integer, real, complex, logical, or
7533 character variable, based on the command line flags finit-local-zero,
7534 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
7535 null if the symbol should not have a default initialization. */
7537 build_default_init_expr (gfc_symbol *sym)
7540 gfc_expr *init_expr;
7543 /* These symbols should never have a default initialization. */
7544 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
7545 || sym->attr.external
7547 || sym->attr.pointer
7548 || sym->attr.in_equivalence
7549 || sym->attr.in_common
7552 || sym->attr.cray_pointee
7553 || sym->attr.cray_pointer)
7556 /* Now we'll try to build an initializer expression. */
7557 init_expr = gfc_get_expr ();
7558 init_expr->expr_type = EXPR_CONSTANT;
7559 init_expr->ts.type = sym->ts.type;
7560 init_expr->ts.kind = sym->ts.kind;
7561 init_expr->where = sym->declared_at;
7563 /* We will only initialize integers, reals, complex, logicals, and
7564 characters, and only if the corresponding command-line flags
7565 were set. Otherwise, we free init_expr and return null. */
7566 switch (sym->ts.type)
7569 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
7570 mpz_init_set_si (init_expr->value.integer,
7571 gfc_option.flag_init_integer_value);
7574 gfc_free_expr (init_expr);
7580 mpfr_init (init_expr->value.real);
7581 switch (gfc_option.flag_init_real)
7583 case GFC_INIT_REAL_SNAN:
7584 init_expr->is_snan = 1;
7586 case GFC_INIT_REAL_NAN:
7587 mpfr_set_nan (init_expr->value.real);
7590 case GFC_INIT_REAL_INF:
7591 mpfr_set_inf (init_expr->value.real, 1);
7594 case GFC_INIT_REAL_NEG_INF:
7595 mpfr_set_inf (init_expr->value.real, -1);
7598 case GFC_INIT_REAL_ZERO:
7599 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
7603 gfc_free_expr (init_expr);
7611 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
7613 mpfr_init (init_expr->value.complex.r);
7614 mpfr_init (init_expr->value.complex.i);
7616 switch (gfc_option.flag_init_real)
7618 case GFC_INIT_REAL_SNAN:
7619 init_expr->is_snan = 1;
7621 case GFC_INIT_REAL_NAN:
7622 mpfr_set_nan (mpc_realref (init_expr->value.complex));
7623 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
7626 case GFC_INIT_REAL_INF:
7627 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
7628 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
7631 case GFC_INIT_REAL_NEG_INF:
7632 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
7633 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
7636 case GFC_INIT_REAL_ZERO:
7638 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
7640 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
7641 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
7646 gfc_free_expr (init_expr);
7653 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
7654 init_expr->value.logical = 0;
7655 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
7656 init_expr->value.logical = 1;
7659 gfc_free_expr (init_expr);
7665 /* For characters, the length must be constant in order to
7666 create a default initializer. */
7667 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
7668 && sym->ts.cl->length
7669 && sym->ts.cl->length->expr_type == EXPR_CONSTANT)
7671 char_len = mpz_get_si (sym->ts.cl->length->value.integer);
7672 init_expr->value.character.length = char_len;
7673 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
7674 for (i = 0; i < char_len; i++)
7675 init_expr->value.character.string[i]
7676 = (unsigned char) gfc_option.flag_init_character_value;
7680 gfc_free_expr (init_expr);
7686 gfc_free_expr (init_expr);
7692 /* Add an initialization expression to a local variable. */
7694 apply_default_init_local (gfc_symbol *sym)
7696 gfc_expr *init = NULL;
7698 /* The symbol should be a variable or a function return value. */
7699 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7700 || (sym->attr.function && sym->result != sym))
7703 /* Try to build the initializer expression. If we can't initialize
7704 this symbol, then init will be NULL. */
7705 init = build_default_init_expr (sym);
7709 /* For saved variables, we don't want to add an initializer at
7710 function entry, so we just add a static initializer. */
7711 if (sym->attr.save || sym->ns->save_all)
7713 /* Don't clobber an existing initializer! */
7714 gcc_assert (sym->value == NULL);
7719 build_init_assign (sym, init);
7722 /* Resolution of common features of flavors variable and procedure. */
7725 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
7727 /* Constraints on deferred shape variable. */
7728 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
7730 if (sym->attr.allocatable)
7732 if (sym->attr.dimension)
7733 gfc_error ("Allocatable array '%s' at %L must have "
7734 "a deferred shape", sym->name, &sym->declared_at);
7736 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
7737 sym->name, &sym->declared_at);
7741 if (sym->attr.pointer && sym->attr.dimension)
7743 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
7744 sym->name, &sym->declared_at);
7751 if (!mp_flag && !sym->attr.allocatable
7752 && !sym->attr.pointer && !sym->attr.dummy)
7754 gfc_error ("Array '%s' at %L cannot have a deferred shape",
7755 sym->name, &sym->declared_at);
7763 /* Additional checks for symbols with flavor variable and derived
7764 type. To be called from resolve_fl_variable. */
7767 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
7769 gcc_assert (sym->ts.type == BT_DERIVED);
7771 /* Check to see if a derived type is blocked from being host
7772 associated by the presence of another class I symbol in the same
7773 namespace. 14.6.1.3 of the standard and the discussion on
7774 comp.lang.fortran. */
7775 if (sym->ns != sym->ts.derived->ns
7776 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
7779 gfc_find_symbol (sym->ts.derived->name, sym->ns, 0, &s);
7780 if (s && s->attr.flavor != FL_DERIVED)
7782 gfc_error ("The type '%s' cannot be host associated at %L "
7783 "because it is blocked by an incompatible object "
7784 "of the same name declared at %L",
7785 sym->ts.derived->name, &sym->declared_at,
7791 /* 4th constraint in section 11.3: "If an object of a type for which
7792 component-initialization is specified (R429) appears in the
7793 specification-part of a module and does not have the ALLOCATABLE
7794 or POINTER attribute, the object shall have the SAVE attribute."
7796 The check for initializers is performed with
7797 has_default_initializer because gfc_default_initializer generates
7798 a hidden default for allocatable components. */
7799 if (!(sym->value || no_init_flag) && sym->ns->proc_name
7800 && sym->ns->proc_name->attr.flavor == FL_MODULE
7801 && !sym->ns->save_all && !sym->attr.save
7802 && !sym->attr.pointer && !sym->attr.allocatable
7803 && has_default_initializer (sym->ts.derived))
7805 gfc_error("Object '%s' at %L must have the SAVE attribute for "
7806 "default initialization of a component",
7807 sym->name, &sym->declared_at);
7811 /* Assign default initializer. */
7812 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
7813 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
7815 sym->value = gfc_default_initializer (&sym->ts);
7822 /* Resolve symbols with flavor variable. */
7825 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
7827 int no_init_flag, automatic_flag;
7829 const char *auto_save_msg;
7831 auto_save_msg = "Automatic object '%s' at %L cannot have the "
7834 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7837 /* Set this flag to check that variables are parameters of all entries.
7838 This check is effected by the call to gfc_resolve_expr through
7839 is_non_constant_shape_array. */
7840 specification_expr = 1;
7842 if (sym->ns->proc_name
7843 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7844 || sym->ns->proc_name->attr.is_main_program)
7845 && !sym->attr.use_assoc
7846 && !sym->attr.allocatable
7847 && !sym->attr.pointer
7848 && is_non_constant_shape_array (sym))
7850 /* The shape of a main program or module array needs to be
7852 gfc_error ("The module or main program array '%s' at %L must "
7853 "have constant shape", sym->name, &sym->declared_at);
7854 specification_expr = 0;
7858 if (sym->ts.type == BT_CHARACTER)
7860 /* Make sure that character string variables with assumed length are
7862 e = sym->ts.cl->length;
7863 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
7865 gfc_error ("Entity with assumed character length at %L must be a "
7866 "dummy argument or a PARAMETER", &sym->declared_at);
7870 if (e && sym->attr.save && !gfc_is_constant_expr (e))
7872 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7876 if (!gfc_is_constant_expr (e)
7877 && !(e->expr_type == EXPR_VARIABLE
7878 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
7879 && sym->ns->proc_name
7880 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7881 || sym->ns->proc_name->attr.is_main_program)
7882 && !sym->attr.use_assoc)
7884 gfc_error ("'%s' at %L must have constant character length "
7885 "in this context", sym->name, &sym->declared_at);
7890 if (sym->value == NULL && sym->attr.referenced)
7891 apply_default_init_local (sym); /* Try to apply a default initialization. */
7893 /* Determine if the symbol may not have an initializer. */
7894 no_init_flag = automatic_flag = 0;
7895 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
7896 || sym->attr.intrinsic || sym->attr.result)
7898 else if (sym->attr.dimension && !sym->attr.pointer
7899 && is_non_constant_shape_array (sym))
7901 no_init_flag = automatic_flag = 1;
7903 /* Also, they must not have the SAVE attribute.
7904 SAVE_IMPLICIT is checked below. */
7905 if (sym->attr.save == SAVE_EXPLICIT)
7907 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7912 /* Ensure that any initializer is simplified. */
7914 gfc_simplify_expr (sym->value, 1);
7916 /* Reject illegal initializers. */
7917 if (!sym->mark && sym->value)
7919 if (sym->attr.allocatable)
7920 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
7921 sym->name, &sym->declared_at);
7922 else if (sym->attr.external)
7923 gfc_error ("External '%s' at %L cannot have an initializer",
7924 sym->name, &sym->declared_at);
7925 else if (sym->attr.dummy
7926 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
7927 gfc_error ("Dummy '%s' at %L cannot have an initializer",
7928 sym->name, &sym->declared_at);
7929 else if (sym->attr.intrinsic)
7930 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
7931 sym->name, &sym->declared_at);
7932 else if (sym->attr.result)
7933 gfc_error ("Function result '%s' at %L cannot have an initializer",
7934 sym->name, &sym->declared_at);
7935 else if (automatic_flag)
7936 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
7937 sym->name, &sym->declared_at);
7944 if (sym->ts.type == BT_DERIVED)
7945 return resolve_fl_variable_derived (sym, no_init_flag);
7951 /* Resolve a procedure. */
7954 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
7956 gfc_formal_arglist *arg;
7958 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
7959 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
7960 "interfaces", sym->name, &sym->declared_at);
7962 if (sym->attr.function
7963 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7966 if (sym->ts.type == BT_CHARACTER)
7968 gfc_charlen *cl = sym->ts.cl;
7970 if (cl && cl->length && gfc_is_constant_expr (cl->length)
7971 && resolve_charlen (cl) == FAILURE)
7974 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
7976 if (sym->attr.proc == PROC_ST_FUNCTION)
7978 gfc_error ("Character-valued statement function '%s' at %L must "
7979 "have constant length", sym->name, &sym->declared_at);
7983 if (sym->attr.external && sym->formal == NULL
7984 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
7986 gfc_error ("Automatic character length function '%s' at %L must "
7987 "have an explicit interface", sym->name,
7994 /* Ensure that derived type for are not of a private type. Internal
7995 module procedures are excluded by 2.2.3.3 - i.e., they are not
7996 externally accessible and can access all the objects accessible in
7998 if (!(sym->ns->parent
7999 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8000 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8002 gfc_interface *iface;
8004 for (arg = sym->formal; arg; arg = arg->next)
8007 && arg->sym->ts.type == BT_DERIVED
8008 && !arg->sym->ts.derived->attr.use_assoc
8009 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8010 arg->sym->ts.derived->ns->default_access)
8011 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8012 "PRIVATE type and cannot be a dummy argument"
8013 " of '%s', which is PUBLIC at %L",
8014 arg->sym->name, sym->name, &sym->declared_at)
8017 /* Stop this message from recurring. */
8018 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8023 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8024 PRIVATE to the containing module. */
8025 for (iface = sym->generic; iface; iface = iface->next)
8027 for (arg = iface->sym->formal; arg; arg = arg->next)
8030 && arg->sym->ts.type == BT_DERIVED
8031 && !arg->sym->ts.derived->attr.use_assoc
8032 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8033 arg->sym->ts.derived->ns->default_access)
8034 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8035 "'%s' in PUBLIC interface '%s' at %L "
8036 "takes dummy arguments of '%s' which is "
8037 "PRIVATE", iface->sym->name, sym->name,
8038 &iface->sym->declared_at,
8039 gfc_typename (&arg->sym->ts)) == FAILURE)
8041 /* Stop this message from recurring. */
8042 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8048 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8049 PRIVATE to the containing module. */
8050 for (iface = sym->generic; iface; iface = iface->next)
8052 for (arg = iface->sym->formal; arg; arg = arg->next)
8055 && arg->sym->ts.type == BT_DERIVED
8056 && !arg->sym->ts.derived->attr.use_assoc
8057 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8058 arg->sym->ts.derived->ns->default_access)
8059 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8060 "'%s' in PUBLIC interface '%s' at %L "
8061 "takes dummy arguments of '%s' which is "
8062 "PRIVATE", iface->sym->name, sym->name,
8063 &iface->sym->declared_at,
8064 gfc_typename (&arg->sym->ts)) == FAILURE)
8066 /* Stop this message from recurring. */
8067 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8074 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8075 && !sym->attr.proc_pointer)
8077 gfc_error ("Function '%s' at %L cannot have an initializer",
8078 sym->name, &sym->declared_at);
8082 /* An external symbol may not have an initializer because it is taken to be
8083 a procedure. Exception: Procedure Pointers. */
8084 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8086 gfc_error ("External object '%s' at %L may not have an initializer",
8087 sym->name, &sym->declared_at);
8091 /* An elemental function is required to return a scalar 12.7.1 */
8092 if (sym->attr.elemental && sym->attr.function && sym->as)
8094 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8095 "result", sym->name, &sym->declared_at);
8096 /* Reset so that the error only occurs once. */
8097 sym->attr.elemental = 0;
8101 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8102 char-len-param shall not be array-valued, pointer-valued, recursive
8103 or pure. ....snip... A character value of * may only be used in the
8104 following ways: (i) Dummy arg of procedure - dummy associates with
8105 actual length; (ii) To declare a named constant; or (iii) External
8106 function - but length must be declared in calling scoping unit. */
8107 if (sym->attr.function
8108 && sym->ts.type == BT_CHARACTER
8109 && sym->ts.cl && sym->ts.cl->length == NULL)
8111 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8112 || (sym->attr.recursive) || (sym->attr.pure))
8114 if (sym->as && sym->as->rank)
8115 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8116 "array-valued", sym->name, &sym->declared_at);
8118 if (sym->attr.pointer)
8119 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8120 "pointer-valued", sym->name, &sym->declared_at);
8123 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8124 "pure", sym->name, &sym->declared_at);
8126 if (sym->attr.recursive)
8127 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8128 "recursive", sym->name, &sym->declared_at);
8133 /* Appendix B.2 of the standard. Contained functions give an
8134 error anyway. Fixed-form is likely to be F77/legacy. */
8135 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8136 gfc_notify_std (GFC_STD_F95_OBS, "CHARACTER(*) function "
8137 "'%s' at %L is obsolescent in fortran 95",
8138 sym->name, &sym->declared_at);
8141 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8143 gfc_formal_arglist *curr_arg;
8144 int has_non_interop_arg = 0;
8146 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8147 sym->common_block) == FAILURE)
8149 /* Clear these to prevent looking at them again if there was an
8151 sym->attr.is_bind_c = 0;
8152 sym->attr.is_c_interop = 0;
8153 sym->ts.is_c_interop = 0;
8157 /* So far, no errors have been found. */
8158 sym->attr.is_c_interop = 1;
8159 sym->ts.is_c_interop = 1;
8162 curr_arg = sym->formal;
8163 while (curr_arg != NULL)
8165 /* Skip implicitly typed dummy args here. */
8166 if (curr_arg->sym->attr.implicit_type == 0)
8167 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8168 /* If something is found to fail, record the fact so we
8169 can mark the symbol for the procedure as not being
8170 BIND(C) to try and prevent multiple errors being
8172 has_non_interop_arg = 1;
8174 curr_arg = curr_arg->next;
8177 /* See if any of the arguments were not interoperable and if so, clear
8178 the procedure symbol to prevent duplicate error messages. */
8179 if (has_non_interop_arg != 0)
8181 sym->attr.is_c_interop = 0;
8182 sym->ts.is_c_interop = 0;
8183 sym->attr.is_bind_c = 0;
8187 if (!sym->attr.proc_pointer)
8189 if (sym->attr.save == SAVE_EXPLICIT)
8191 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8192 "in '%s' at %L", sym->name, &sym->declared_at);
8195 if (sym->attr.intent)
8197 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8198 "in '%s' at %L", sym->name, &sym->declared_at);
8201 if (sym->attr.subroutine && sym->attr.result)
8203 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
8204 "in '%s' at %L", sym->name, &sym->declared_at);
8207 if (sym->attr.external && sym->attr.function
8208 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
8209 || sym->attr.contained))
8211 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
8212 "in '%s' at %L", sym->name, &sym->declared_at);
8215 if (strcmp ("ppr@", sym->name) == 0)
8217 gfc_error ("Procedure pointer result '%s' at %L "
8218 "is missing the pointer attribute",
8219 sym->ns->proc_name->name, &sym->declared_at);
8228 /* Resolve a list of finalizer procedures. That is, after they have hopefully
8229 been defined and we now know their defined arguments, check that they fulfill
8230 the requirements of the standard for procedures used as finalizers. */
8233 gfc_resolve_finalizers (gfc_symbol* derived)
8235 gfc_finalizer* list;
8236 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
8237 gfc_try result = SUCCESS;
8238 bool seen_scalar = false;
8240 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
8243 /* Walk over the list of finalizer-procedures, check them, and if any one
8244 does not fit in with the standard's definition, print an error and remove
8245 it from the list. */
8246 prev_link = &derived->f2k_derived->finalizers;
8247 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
8253 /* Skip this finalizer if we already resolved it. */
8254 if (list->proc_tree)
8256 prev_link = &(list->next);
8260 /* Check this exists and is a SUBROUTINE. */
8261 if (!list->proc_sym->attr.subroutine)
8263 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
8264 list->proc_sym->name, &list->where);
8268 /* We should have exactly one argument. */
8269 if (!list->proc_sym->formal || list->proc_sym->formal->next)
8271 gfc_error ("FINAL procedure at %L must have exactly one argument",
8275 arg = list->proc_sym->formal->sym;
8277 /* This argument must be of our type. */
8278 if (arg->ts.type != BT_DERIVED || arg->ts.derived != derived)
8280 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
8281 &arg->declared_at, derived->name);
8285 /* It must neither be a pointer nor allocatable nor optional. */
8286 if (arg->attr.pointer)
8288 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
8292 if (arg->attr.allocatable)
8294 gfc_error ("Argument of FINAL procedure at %L must not be"
8295 " ALLOCATABLE", &arg->declared_at);
8298 if (arg->attr.optional)
8300 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
8305 /* It must not be INTENT(OUT). */
8306 if (arg->attr.intent == INTENT_OUT)
8308 gfc_error ("Argument of FINAL procedure at %L must not be"
8309 " INTENT(OUT)", &arg->declared_at);
8313 /* Warn if the procedure is non-scalar and not assumed shape. */
8314 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
8315 && arg->as->type != AS_ASSUMED_SHAPE)
8316 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
8317 " shape argument", &arg->declared_at);
8319 /* Check that it does not match in kind and rank with a FINAL procedure
8320 defined earlier. To really loop over the *earlier* declarations,
8321 we need to walk the tail of the list as new ones were pushed at the
8323 /* TODO: Handle kind parameters once they are implemented. */
8324 my_rank = (arg->as ? arg->as->rank : 0);
8325 for (i = list->next; i; i = i->next)
8327 /* Argument list might be empty; that is an error signalled earlier,
8328 but we nevertheless continued resolving. */
8329 if (i->proc_sym->formal)
8331 gfc_symbol* i_arg = i->proc_sym->formal->sym;
8332 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
8333 if (i_rank == my_rank)
8335 gfc_error ("FINAL procedure '%s' declared at %L has the same"
8336 " rank (%d) as '%s'",
8337 list->proc_sym->name, &list->where, my_rank,
8344 /* Is this the/a scalar finalizer procedure? */
8345 if (!arg->as || arg->as->rank == 0)
8348 /* Find the symtree for this procedure. */
8349 gcc_assert (!list->proc_tree);
8350 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
8352 prev_link = &list->next;
8355 /* Remove wrong nodes immediately from the list so we don't risk any
8356 troubles in the future when they might fail later expectations. */
8360 *prev_link = list->next;
8361 gfc_free_finalizer (i);
8364 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
8365 were nodes in the list, must have been for arrays. It is surely a good
8366 idea to have a scalar version there if there's something to finalize. */
8367 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
8368 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
8369 " defined at %L, suggest also scalar one",
8370 derived->name, &derived->declared_at);
8372 /* TODO: Remove this error when finalization is finished. */
8373 gfc_error ("Finalization at %L is not yet implemented",
8374 &derived->declared_at);
8380 /* Check that it is ok for the typebound procedure proc to override the
8384 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
8387 const gfc_symbol* proc_target;
8388 const gfc_symbol* old_target;
8389 unsigned proc_pass_arg, old_pass_arg, argpos;
8390 gfc_formal_arglist* proc_formal;
8391 gfc_formal_arglist* old_formal;
8393 /* This procedure should only be called for non-GENERIC proc. */
8394 gcc_assert (!proc->n.tb->is_generic);
8396 /* If the overwritten procedure is GENERIC, this is an error. */
8397 if (old->n.tb->is_generic)
8399 gfc_error ("Can't overwrite GENERIC '%s' at %L",
8400 old->name, &proc->n.tb->where);
8404 where = proc->n.tb->where;
8405 proc_target = proc->n.tb->u.specific->n.sym;
8406 old_target = old->n.tb->u.specific->n.sym;
8408 /* Check that overridden binding is not NON_OVERRIDABLE. */
8409 if (old->n.tb->non_overridable)
8411 gfc_error ("'%s' at %L overrides a procedure binding declared"
8412 " NON_OVERRIDABLE", proc->name, &where);
8416 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
8417 if (!old->n.tb->deferred && proc->n.tb->deferred)
8419 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
8420 " non-DEFERRED binding", proc->name, &where);
8424 /* If the overridden binding is PURE, the overriding must be, too. */
8425 if (old_target->attr.pure && !proc_target->attr.pure)
8427 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
8428 proc->name, &where);
8432 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
8433 is not, the overriding must not be either. */
8434 if (old_target->attr.elemental && !proc_target->attr.elemental)
8436 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
8437 " ELEMENTAL", proc->name, &where);
8440 if (!old_target->attr.elemental && proc_target->attr.elemental)
8442 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
8443 " be ELEMENTAL, either", proc->name, &where);
8447 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
8449 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
8451 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
8452 " SUBROUTINE", proc->name, &where);
8456 /* If the overridden binding is a FUNCTION, the overriding must also be a
8457 FUNCTION and have the same characteristics. */
8458 if (old_target->attr.function)
8460 if (!proc_target->attr.function)
8462 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
8463 " FUNCTION", proc->name, &where);
8467 /* FIXME: Do more comprehensive checking (including, for instance, the
8468 rank and array-shape). */
8469 gcc_assert (proc_target->result && old_target->result);
8470 if (!gfc_compare_types (&proc_target->result->ts,
8471 &old_target->result->ts))
8473 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
8474 " matching result types", proc->name, &where);
8479 /* If the overridden binding is PUBLIC, the overriding one must not be
8481 if (old->n.tb->access == ACCESS_PUBLIC
8482 && proc->n.tb->access == ACCESS_PRIVATE)
8484 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
8485 " PRIVATE", proc->name, &where);
8489 /* Compare the formal argument lists of both procedures. This is also abused
8490 to find the position of the passed-object dummy arguments of both
8491 bindings as at least the overridden one might not yet be resolved and we
8492 need those positions in the check below. */
8493 proc_pass_arg = old_pass_arg = 0;
8494 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
8496 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
8499 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
8500 proc_formal && old_formal;
8501 proc_formal = proc_formal->next, old_formal = old_formal->next)
8503 if (proc->n.tb->pass_arg
8504 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
8505 proc_pass_arg = argpos;
8506 if (old->n.tb->pass_arg
8507 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
8508 old_pass_arg = argpos;
8510 /* Check that the names correspond. */
8511 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
8513 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
8514 " to match the corresponding argument of the overridden"
8515 " procedure", proc_formal->sym->name, proc->name, &where,
8516 old_formal->sym->name);
8520 /* Check that the types correspond if neither is the passed-object
8522 /* FIXME: Do more comprehensive testing here. */
8523 if (proc_pass_arg != argpos && old_pass_arg != argpos
8524 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
8526 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
8527 " in respect to the overridden procedure",
8528 proc_formal->sym->name, proc->name, &where);
8534 if (proc_formal || old_formal)
8536 gfc_error ("'%s' at %L must have the same number of formal arguments as"
8537 " the overridden procedure", proc->name, &where);
8541 /* If the overridden binding is NOPASS, the overriding one must also be
8543 if (old->n.tb->nopass && !proc->n.tb->nopass)
8545 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
8546 " NOPASS", proc->name, &where);
8550 /* If the overridden binding is PASS(x), the overriding one must also be
8551 PASS and the passed-object dummy arguments must correspond. */
8552 if (!old->n.tb->nopass)
8554 if (proc->n.tb->nopass)
8556 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
8557 " PASS", proc->name, &where);
8561 if (proc_pass_arg != old_pass_arg)
8563 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
8564 " the same position as the passed-object dummy argument of"
8565 " the overridden procedure", proc->name, &where);
8574 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
8577 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
8578 const char* generic_name, locus where)
8583 gcc_assert (t1->specific && t2->specific);
8584 gcc_assert (!t1->specific->is_generic);
8585 gcc_assert (!t2->specific->is_generic);
8587 sym1 = t1->specific->u.specific->n.sym;
8588 sym2 = t2->specific->u.specific->n.sym;
8590 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
8591 if (sym1->attr.subroutine != sym2->attr.subroutine
8592 || sym1->attr.function != sym2->attr.function)
8594 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
8595 " GENERIC '%s' at %L",
8596 sym1->name, sym2->name, generic_name, &where);
8600 /* Compare the interfaces. */
8601 if (gfc_compare_interfaces (sym1, sym2, 1, 0, NULL, 0))
8603 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
8604 sym1->name, sym2->name, generic_name, &where);
8612 /* Resolve a GENERIC procedure binding for a derived type. */
8615 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
8617 gfc_tbp_generic* target;
8618 gfc_symtree* first_target;
8619 gfc_symbol* super_type;
8620 gfc_symtree* inherited;
8623 gcc_assert (st->n.tb);
8624 gcc_assert (st->n.tb->is_generic);
8626 where = st->n.tb->where;
8627 super_type = gfc_get_derived_super_type (derived);
8629 /* Find the overridden binding if any. */
8630 st->n.tb->overridden = NULL;
8633 gfc_symtree* overridden;
8634 overridden = gfc_find_typebound_proc (super_type, NULL, st->name, true);
8636 if (overridden && overridden->n.tb)
8637 st->n.tb->overridden = overridden->n.tb;
8640 /* Try to find the specific bindings for the symtrees in our target-list. */
8641 gcc_assert (st->n.tb->u.generic);
8642 for (target = st->n.tb->u.generic; target; target = target->next)
8643 if (!target->specific)
8645 gfc_typebound_proc* overridden_tbp;
8647 const char* target_name;
8649 target_name = target->specific_st->name;
8651 /* Defined for this type directly. */
8652 if (target->specific_st->n.tb)
8654 target->specific = target->specific_st->n.tb;
8655 goto specific_found;
8658 /* Look for an inherited specific binding. */
8661 inherited = gfc_find_typebound_proc (super_type, NULL,
8666 gcc_assert (inherited->n.tb);
8667 target->specific = inherited->n.tb;
8668 goto specific_found;
8672 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
8673 " at %L", target_name, st->name, &where);
8676 /* Once we've found the specific binding, check it is not ambiguous with
8677 other specifics already found or inherited for the same GENERIC. */
8679 gcc_assert (target->specific);
8681 /* This must really be a specific binding! */
8682 if (target->specific->is_generic)
8684 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
8685 " '%s' is GENERIC, too", st->name, &where, target_name);
8689 /* Check those already resolved on this type directly. */
8690 for (g = st->n.tb->u.generic; g; g = g->next)
8691 if (g != target && g->specific
8692 && check_generic_tbp_ambiguity (target, g, st->name, where)
8696 /* Check for ambiguity with inherited specific targets. */
8697 for (overridden_tbp = st->n.tb->overridden; overridden_tbp;
8698 overridden_tbp = overridden_tbp->overridden)
8699 if (overridden_tbp->is_generic)
8701 for (g = overridden_tbp->u.generic; g; g = g->next)
8703 gcc_assert (g->specific);
8704 if (check_generic_tbp_ambiguity (target, g,
8705 st->name, where) == FAILURE)
8711 /* If we attempt to "overwrite" a specific binding, this is an error. */
8712 if (st->n.tb->overridden && !st->n.tb->overridden->is_generic)
8714 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
8715 " the same name", st->name, &where);
8719 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
8720 all must have the same attributes here. */
8721 first_target = st->n.tb->u.generic->specific->u.specific;
8722 gcc_assert (first_target);
8723 st->n.tb->subroutine = first_target->n.sym->attr.subroutine;
8724 st->n.tb->function = first_target->n.sym->attr.function;
8730 /* Resolve the type-bound procedures for a derived type. */
8732 static gfc_symbol* resolve_bindings_derived;
8733 static gfc_try resolve_bindings_result;
8736 resolve_typebound_procedure (gfc_symtree* stree)
8741 gfc_symbol* super_type;
8742 gfc_component* comp;
8746 /* Undefined specific symbol from GENERIC target definition. */
8750 if (stree->n.tb->error)
8753 /* If this is a GENERIC binding, use that routine. */
8754 if (stree->n.tb->is_generic)
8756 if (resolve_typebound_generic (resolve_bindings_derived, stree)
8762 /* Get the target-procedure to check it. */
8763 gcc_assert (!stree->n.tb->is_generic);
8764 gcc_assert (stree->n.tb->u.specific);
8765 proc = stree->n.tb->u.specific->n.sym;
8766 where = stree->n.tb->where;
8768 /* Default access should already be resolved from the parser. */
8769 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
8771 /* It should be a module procedure or an external procedure with explicit
8772 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
8773 if ((!proc->attr.subroutine && !proc->attr.function)
8774 || (proc->attr.proc != PROC_MODULE
8775 && proc->attr.if_source != IFSRC_IFBODY)
8776 || (proc->attr.abstract && !stree->n.tb->deferred))
8778 gfc_error ("'%s' must be a module procedure or an external procedure with"
8779 " an explicit interface at %L", proc->name, &where);
8782 stree->n.tb->subroutine = proc->attr.subroutine;
8783 stree->n.tb->function = proc->attr.function;
8785 /* Find the super-type of the current derived type. We could do this once and
8786 store in a global if speed is needed, but as long as not I believe this is
8787 more readable and clearer. */
8788 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
8790 /* If PASS, resolve and check arguments if not already resolved / loaded
8791 from a .mod file. */
8792 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
8794 if (stree->n.tb->pass_arg)
8796 gfc_formal_arglist* i;
8798 /* If an explicit passing argument name is given, walk the arg-list
8802 stree->n.tb->pass_arg_num = 1;
8803 for (i = proc->formal; i; i = i->next)
8805 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
8810 ++stree->n.tb->pass_arg_num;
8815 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
8817 proc->name, stree->n.tb->pass_arg, &where,
8818 stree->n.tb->pass_arg);
8824 /* Otherwise, take the first one; there should in fact be at least
8826 stree->n.tb->pass_arg_num = 1;
8829 gfc_error ("Procedure '%s' with PASS at %L must have at"
8830 " least one argument", proc->name, &where);
8833 me_arg = proc->formal->sym;
8836 /* Now check that the argument-type matches. */
8837 gcc_assert (me_arg);
8838 if (me_arg->ts.type != BT_DERIVED
8839 || me_arg->ts.derived != resolve_bindings_derived)
8841 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
8842 " the derived-type '%s'", me_arg->name, proc->name,
8843 me_arg->name, &where, resolve_bindings_derived->name);
8847 gfc_warning ("Polymorphic entities are not yet implemented,"
8848 " non-polymorphic passed-object dummy argument of '%s'"
8849 " at %L accepted", proc->name, &where);
8852 /* If we are extending some type, check that we don't override a procedure
8853 flagged NON_OVERRIDABLE. */
8854 stree->n.tb->overridden = NULL;
8857 gfc_symtree* overridden;
8858 overridden = gfc_find_typebound_proc (super_type, NULL,
8861 if (overridden && overridden->n.tb)
8862 stree->n.tb->overridden = overridden->n.tb;
8864 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
8868 /* See if there's a name collision with a component directly in this type. */
8869 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
8870 if (!strcmp (comp->name, stree->name))
8872 gfc_error ("Procedure '%s' at %L has the same name as a component of"
8874 stree->name, &where, resolve_bindings_derived->name);
8878 /* Try to find a name collision with an inherited component. */
8879 if (super_type && gfc_find_component (super_type, stree->name, true, true))
8881 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
8882 " component of '%s'",
8883 stree->name, &where, resolve_bindings_derived->name);
8887 stree->n.tb->error = 0;
8891 resolve_bindings_result = FAILURE;
8892 stree->n.tb->error = 1;
8896 resolve_typebound_procedures (gfc_symbol* derived)
8898 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
8901 resolve_bindings_derived = derived;
8902 resolve_bindings_result = SUCCESS;
8903 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
8904 &resolve_typebound_procedure);
8906 return resolve_bindings_result;
8910 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
8911 to give all identical derived types the same backend_decl. */
8913 add_dt_to_dt_list (gfc_symbol *derived)
8915 gfc_dt_list *dt_list;
8917 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
8918 if (derived == dt_list->derived)
8921 if (dt_list == NULL)
8923 dt_list = gfc_get_dt_list ();
8924 dt_list->next = gfc_derived_types;
8925 dt_list->derived = derived;
8926 gfc_derived_types = dt_list;
8931 /* Ensure that a derived-type is really not abstract, meaning that every
8932 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
8935 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
8940 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
8942 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
8945 if (st->n.tb && st->n.tb->deferred)
8947 gfc_symtree* overriding;
8948 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true);
8949 gcc_assert (overriding && overriding->n.tb);
8950 if (overriding->n.tb->deferred)
8952 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
8953 " '%s' is DEFERRED and not overridden",
8954 sub->name, &sub->declared_at, st->name);
8963 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
8965 /* The algorithm used here is to recursively travel up the ancestry of sub
8966 and for each ancestor-type, check all bindings. If any of them is
8967 DEFERRED, look it up starting from sub and see if the found (overriding)
8968 binding is not DEFERRED.
8969 This is not the most efficient way to do this, but it should be ok and is
8970 clearer than something sophisticated. */
8972 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
8974 /* Walk bindings of this ancestor. */
8975 if (ancestor->f2k_derived)
8978 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
8983 /* Find next ancestor type and recurse on it. */
8984 ancestor = gfc_get_derived_super_type (ancestor);
8986 return ensure_not_abstract (sub, ancestor);
8992 /* Resolve the components of a derived type. */
8995 resolve_fl_derived (gfc_symbol *sym)
8997 gfc_symbol* super_type;
9001 super_type = gfc_get_derived_super_type (sym);
9003 /* Ensure the extended type gets resolved before we do. */
9004 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9007 /* An ABSTRACT type must be extensible. */
9008 if (sym->attr.abstract && (sym->attr.is_bind_c || sym->attr.sequence))
9010 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9011 sym->name, &sym->declared_at);
9015 for (c = sym->components; c != NULL; c = c->next)
9017 if (c->attr.proc_pointer && c->ts.interface)
9019 if (c->ts.interface->attr.procedure)
9020 gfc_error ("Interface '%s', used by procedure pointer component "
9021 "'%s' at %L, is declared in a later PROCEDURE statement",
9022 c->ts.interface->name, c->name, &c->loc);
9024 /* Get the attributes from the interface (now resolved). */
9025 if (c->ts.interface->attr.if_source
9026 || c->ts.interface->attr.intrinsic)
9028 gfc_symbol *ifc = c->ts.interface;
9030 if (ifc->attr.intrinsic)
9031 resolve_intrinsic (ifc, &ifc->declared_at);
9034 c->ts = ifc->result->ts;
9037 c->ts.interface = ifc;
9038 c->attr.function = ifc->attr.function;
9039 c->attr.subroutine = ifc->attr.subroutine;
9040 gfc_copy_formal_args_ppc (c, ifc);
9042 c->attr.allocatable = ifc->attr.allocatable;
9043 c->attr.pointer = ifc->attr.pointer;
9044 c->attr.pure = ifc->attr.pure;
9045 c->attr.elemental = ifc->attr.elemental;
9046 c->attr.dimension = ifc->attr.dimension;
9047 c->attr.recursive = ifc->attr.recursive;
9048 c->attr.always_explicit = ifc->attr.always_explicit;
9049 /* Copy array spec. */
9050 c->as = gfc_copy_array_spec (ifc->as);
9054 for (i = 0; i < c->as->rank; i++)
9056 gfc_expr_replace_symbols (c->as->lower[i], c);
9057 gfc_expr_replace_symbols (c->as->upper[i], c);
9060 /* Copy char length. */
9063 c->ts.cl = gfc_get_charlen();
9064 c->ts.cl->resolved = ifc->ts.cl->resolved;
9065 c->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9066 /* TODO: gfc_expr_replace_symbols (c->ts.cl->length, c);*/
9067 /* Add charlen to namespace. */
9070 c->ts.cl->next = c->formal_ns->cl_list;
9071 c->formal_ns->cl_list = c->ts.cl;
9075 else if (c->ts.interface->name[0] != '\0')
9077 gfc_error ("Interface '%s' of procedure pointer component "
9078 "'%s' at %L must be explicit", c->ts.interface->name,
9083 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
9085 c->ts = *gfc_get_default_type (c->name, NULL);
9086 c->attr.implicit_type = 1;
9089 /* Check type-spec if this is not the parent-type component. */
9090 if ((!sym->attr.extension || c != sym->components)
9091 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
9094 /* If this type is an extension, see if this component has the same name
9095 as an inherited type-bound procedure. */
9097 && gfc_find_typebound_proc (super_type, NULL, c->name, true))
9099 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
9100 " inherited type-bound procedure",
9101 c->name, sym->name, &c->loc);
9105 if (c->ts.type == BT_CHARACTER)
9107 if (c->ts.cl->length == NULL
9108 || (resolve_charlen (c->ts.cl) == FAILURE)
9109 || !gfc_is_constant_expr (c->ts.cl->length))
9111 gfc_error ("Character length of component '%s' needs to "
9112 "be a constant specification expression at %L",
9114 c->ts.cl->length ? &c->ts.cl->length->where : &c->loc);
9119 if (c->ts.type == BT_DERIVED
9120 && sym->component_access != ACCESS_PRIVATE
9121 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9122 && !is_sym_host_assoc (c->ts.derived, sym->ns)
9123 && !c->ts.derived->attr.use_assoc
9124 && !gfc_check_access (c->ts.derived->attr.access,
9125 c->ts.derived->ns->default_access)
9126 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
9127 "is a PRIVATE type and cannot be a component of "
9128 "'%s', which is PUBLIC at %L", c->name,
9129 sym->name, &sym->declared_at) == FAILURE)
9132 if (sym->attr.sequence)
9134 if (c->ts.type == BT_DERIVED && c->ts.derived->attr.sequence == 0)
9136 gfc_error ("Component %s of SEQUENCE type declared at %L does "
9137 "not have the SEQUENCE attribute",
9138 c->ts.derived->name, &sym->declared_at);
9143 if (c->ts.type == BT_DERIVED && c->attr.pointer
9144 && c->ts.derived->components == NULL
9145 && !c->ts.derived->attr.zero_comp)
9147 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
9148 "that has not been declared", c->name, sym->name,
9153 /* Ensure that all the derived type components are put on the
9154 derived type list; even in formal namespaces, where derived type
9155 pointer components might not have been declared. */
9156 if (c->ts.type == BT_DERIVED
9158 && c->ts.derived->components
9160 && sym != c->ts.derived)
9161 add_dt_to_dt_list (c->ts.derived);
9163 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
9167 for (i = 0; i < c->as->rank; i++)
9169 if (c->as->lower[i] == NULL
9170 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
9171 || !gfc_is_constant_expr (c->as->lower[i])
9172 || c->as->upper[i] == NULL
9173 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
9174 || !gfc_is_constant_expr (c->as->upper[i]))
9176 gfc_error ("Component '%s' of '%s' at %L must have "
9177 "constant array bounds",
9178 c->name, sym->name, &c->loc);
9184 /* Resolve the type-bound procedures. */
9185 if (resolve_typebound_procedures (sym) == FAILURE)
9188 /* Resolve the finalizer procedures. */
9189 if (gfc_resolve_finalizers (sym) == FAILURE)
9192 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
9193 all DEFERRED bindings are overridden. */
9194 if (super_type && super_type->attr.abstract && !sym->attr.abstract
9195 && ensure_not_abstract (sym, super_type) == FAILURE)
9198 /* Add derived type to the derived type list. */
9199 add_dt_to_dt_list (sym);
9206 resolve_fl_namelist (gfc_symbol *sym)
9211 /* Reject PRIVATE objects in a PUBLIC namelist. */
9212 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
9214 for (nl = sym->namelist; nl; nl = nl->next)
9216 if (!nl->sym->attr.use_assoc
9217 && !is_sym_host_assoc (nl->sym, sym->ns)
9218 && !gfc_check_access(nl->sym->attr.access,
9219 nl->sym->ns->default_access))
9221 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
9222 "cannot be member of PUBLIC namelist '%s' at %L",
9223 nl->sym->name, sym->name, &sym->declared_at);
9227 /* Types with private components that came here by USE-association. */
9228 if (nl->sym->ts.type == BT_DERIVED
9229 && derived_inaccessible (nl->sym->ts.derived))
9231 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
9232 "components and cannot be member of namelist '%s' at %L",
9233 nl->sym->name, sym->name, &sym->declared_at);
9237 /* Types with private components that are defined in the same module. */
9238 if (nl->sym->ts.type == BT_DERIVED
9239 && !is_sym_host_assoc (nl->sym->ts.derived, sym->ns)
9240 && !gfc_check_access (nl->sym->ts.derived->attr.private_comp
9241 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
9242 nl->sym->ns->default_access))
9244 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
9245 "cannot be a member of PUBLIC namelist '%s' at %L",
9246 nl->sym->name, sym->name, &sym->declared_at);
9252 for (nl = sym->namelist; nl; nl = nl->next)
9254 /* Reject namelist arrays of assumed shape. */
9255 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
9256 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
9257 "must not have assumed shape in namelist "
9258 "'%s' at %L", nl->sym->name, sym->name,
9259 &sym->declared_at) == FAILURE)
9262 /* Reject namelist arrays that are not constant shape. */
9263 if (is_non_constant_shape_array (nl->sym))
9265 gfc_error ("NAMELIST array object '%s' must have constant "
9266 "shape in namelist '%s' at %L", nl->sym->name,
9267 sym->name, &sym->declared_at);
9271 /* Namelist objects cannot have allocatable or pointer components. */
9272 if (nl->sym->ts.type != BT_DERIVED)
9275 if (nl->sym->ts.derived->attr.alloc_comp)
9277 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9278 "have ALLOCATABLE components",
9279 nl->sym->name, sym->name, &sym->declared_at);
9283 if (nl->sym->ts.derived->attr.pointer_comp)
9285 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9286 "have POINTER components",
9287 nl->sym->name, sym->name, &sym->declared_at);
9293 /* 14.1.2 A module or internal procedure represent local entities
9294 of the same type as a namelist member and so are not allowed. */
9295 for (nl = sym->namelist; nl; nl = nl->next)
9297 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
9300 if (nl->sym->attr.function && nl->sym == nl->sym->result)
9301 if ((nl->sym == sym->ns->proc_name)
9303 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
9307 if (nl->sym && nl->sym->name)
9308 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
9309 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
9311 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
9312 "attribute in '%s' at %L", nlsym->name,
9323 resolve_fl_parameter (gfc_symbol *sym)
9325 /* A parameter array's shape needs to be constant. */
9327 && (sym->as->type == AS_DEFERRED
9328 || is_non_constant_shape_array (sym)))
9330 gfc_error ("Parameter array '%s' at %L cannot be automatic "
9331 "or of deferred shape", sym->name, &sym->declared_at);
9335 /* Make sure a parameter that has been implicitly typed still
9336 matches the implicit type, since PARAMETER statements can precede
9337 IMPLICIT statements. */
9338 if (sym->attr.implicit_type
9339 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
9342 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
9343 "later IMPLICIT type", sym->name, &sym->declared_at);
9347 /* Make sure the types of derived parameters are consistent. This
9348 type checking is deferred until resolution because the type may
9349 refer to a derived type from the host. */
9350 if (sym->ts.type == BT_DERIVED
9351 && !gfc_compare_types (&sym->ts, &sym->value->ts))
9353 gfc_error ("Incompatible derived type in PARAMETER at %L",
9354 &sym->value->where);
9361 /* Do anything necessary to resolve a symbol. Right now, we just
9362 assume that an otherwise unknown symbol is a variable. This sort
9363 of thing commonly happens for symbols in module. */
9366 resolve_symbol (gfc_symbol *sym)
9368 int check_constant, mp_flag;
9369 gfc_symtree *symtree;
9370 gfc_symtree *this_symtree;
9374 if (sym->attr.flavor == FL_UNKNOWN)
9377 /* If we find that a flavorless symbol is an interface in one of the
9378 parent namespaces, find its symtree in this namespace, free the
9379 symbol and set the symtree to point to the interface symbol. */
9380 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
9382 symtree = gfc_find_symtree (ns->sym_root, sym->name);
9383 if (symtree && symtree->n.sym->generic)
9385 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
9389 gfc_free_symbol (sym);
9390 symtree->n.sym->refs++;
9391 this_symtree->n.sym = symtree->n.sym;
9396 /* Otherwise give it a flavor according to such attributes as
9398 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
9399 sym->attr.flavor = FL_VARIABLE;
9402 sym->attr.flavor = FL_PROCEDURE;
9403 if (sym->attr.dimension)
9404 sym->attr.function = 1;
9408 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
9409 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
9411 if (sym->attr.procedure && sym->ts.interface
9412 && sym->attr.if_source != IFSRC_DECL)
9414 if (sym->ts.interface == sym)
9416 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
9417 "interface", sym->name, &sym->declared_at);
9420 if (sym->ts.interface->attr.procedure)
9422 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
9423 " in a later PROCEDURE statement", sym->ts.interface->name,
9424 sym->name,&sym->declared_at);
9428 /* Get the attributes from the interface (now resolved). */
9429 if (sym->ts.interface->attr.if_source
9430 || sym->ts.interface->attr.intrinsic)
9432 gfc_symbol *ifc = sym->ts.interface;
9433 resolve_symbol (ifc);
9435 if (ifc->attr.intrinsic)
9436 resolve_intrinsic (ifc, &ifc->declared_at);
9439 sym->ts = ifc->result->ts;
9442 sym->ts.interface = ifc;
9443 sym->attr.function = ifc->attr.function;
9444 sym->attr.subroutine = ifc->attr.subroutine;
9445 gfc_copy_formal_args (sym, ifc);
9447 sym->attr.allocatable = ifc->attr.allocatable;
9448 sym->attr.pointer = ifc->attr.pointer;
9449 sym->attr.pure = ifc->attr.pure;
9450 sym->attr.elemental = ifc->attr.elemental;
9451 sym->attr.dimension = ifc->attr.dimension;
9452 sym->attr.recursive = ifc->attr.recursive;
9453 sym->attr.always_explicit = ifc->attr.always_explicit;
9454 /* Copy array spec. */
9455 sym->as = gfc_copy_array_spec (ifc->as);
9459 for (i = 0; i < sym->as->rank; i++)
9461 gfc_expr_replace_symbols (sym->as->lower[i], sym);
9462 gfc_expr_replace_symbols (sym->as->upper[i], sym);
9465 /* Copy char length. */
9468 sym->ts.cl = gfc_get_charlen();
9469 sym->ts.cl->resolved = ifc->ts.cl->resolved;
9470 sym->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9471 gfc_expr_replace_symbols (sym->ts.cl->length, sym);
9472 /* Add charlen to namespace. */
9475 sym->ts.cl->next = sym->formal_ns->cl_list;
9476 sym->formal_ns->cl_list = sym->ts.cl;
9480 else if (sym->ts.interface->name[0] != '\0')
9482 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
9483 sym->ts.interface->name, sym->name, &sym->declared_at);
9488 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
9491 /* Symbols that are module procedures with results (functions) have
9492 the types and array specification copied for type checking in
9493 procedures that call them, as well as for saving to a module
9494 file. These symbols can't stand the scrutiny that their results
9496 mp_flag = (sym->result != NULL && sym->result != sym);
9499 /* Make sure that the intrinsic is consistent with its internal
9500 representation. This needs to be done before assigning a default
9501 type to avoid spurious warnings. */
9502 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic)
9504 gfc_intrinsic_sym* isym;
9507 /* We already know this one is an intrinsic, so we don't call
9508 gfc_is_intrinsic for full checking but rather use gfc_find_function and
9509 gfc_find_subroutine directly to check whether it is a function or
9512 if ((isym = gfc_find_function (sym->name)))
9514 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
9515 && !sym->attr.implicit_type)
9516 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
9517 " ignored", sym->name, &sym->declared_at);
9519 else if ((isym = gfc_find_subroutine (sym->name)))
9521 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
9523 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
9524 " specifier", sym->name, &sym->declared_at);
9530 gfc_error ("'%s' declared INTRINSIC at %L does not exist",
9531 sym->name, &sym->declared_at);
9535 /* Check it is actually available in the standard settings. */
9536 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
9539 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
9540 " available in the current standard settings but %s. Use"
9541 " an appropriate -std=* option or enable -fall-intrinsics"
9542 " in order to use it.",
9543 sym->name, &sym->declared_at, symstd);
9548 /* Assign default type to symbols that need one and don't have one. */
9549 if (sym->ts.type == BT_UNKNOWN)
9551 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
9552 gfc_set_default_type (sym, 1, NULL);
9554 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
9556 /* The specific case of an external procedure should emit an error
9557 in the case that there is no implicit type. */
9559 gfc_set_default_type (sym, sym->attr.external, NULL);
9562 /* Result may be in another namespace. */
9563 resolve_symbol (sym->result);
9565 if (!sym->result->attr.proc_pointer)
9567 sym->ts = sym->result->ts;
9568 sym->as = gfc_copy_array_spec (sym->result->as);
9569 sym->attr.dimension = sym->result->attr.dimension;
9570 sym->attr.pointer = sym->result->attr.pointer;
9571 sym->attr.allocatable = sym->result->attr.allocatable;
9577 /* Assumed size arrays and assumed shape arrays must be dummy
9581 && (sym->as->type == AS_ASSUMED_SIZE
9582 || sym->as->type == AS_ASSUMED_SHAPE)
9583 && sym->attr.dummy == 0)
9585 if (sym->as->type == AS_ASSUMED_SIZE)
9586 gfc_error ("Assumed size array at %L must be a dummy argument",
9589 gfc_error ("Assumed shape array at %L must be a dummy argument",
9594 /* Make sure symbols with known intent or optional are really dummy
9595 variable. Because of ENTRY statement, this has to be deferred
9596 until resolution time. */
9598 if (!sym->attr.dummy
9599 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
9601 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
9605 if (sym->attr.value && !sym->attr.dummy)
9607 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
9608 "it is not a dummy argument", sym->name, &sym->declared_at);
9612 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
9614 gfc_charlen *cl = sym->ts.cl;
9615 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9617 gfc_error ("Character dummy variable '%s' at %L with VALUE "
9618 "attribute must have constant length",
9619 sym->name, &sym->declared_at);
9623 if (sym->ts.is_c_interop
9624 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
9626 gfc_error ("C interoperable character dummy variable '%s' at %L "
9627 "with VALUE attribute must have length one",
9628 sym->name, &sym->declared_at);
9633 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
9634 do this for something that was implicitly typed because that is handled
9635 in gfc_set_default_type. Handle dummy arguments and procedure
9636 definitions separately. Also, anything that is use associated is not
9637 handled here but instead is handled in the module it is declared in.
9638 Finally, derived type definitions are allowed to be BIND(C) since that
9639 only implies that they're interoperable, and they are checked fully for
9640 interoperability when a variable is declared of that type. */
9641 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
9642 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
9643 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
9645 gfc_try t = SUCCESS;
9647 /* First, make sure the variable is declared at the
9648 module-level scope (J3/04-007, Section 15.3). */
9649 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
9650 sym->attr.in_common == 0)
9652 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
9653 "is neither a COMMON block nor declared at the "
9654 "module level scope", sym->name, &(sym->declared_at));
9657 else if (sym->common_head != NULL)
9659 t = verify_com_block_vars_c_interop (sym->common_head);
9663 /* If type() declaration, we need to verify that the components
9664 of the given type are all C interoperable, etc. */
9665 if (sym->ts.type == BT_DERIVED &&
9666 sym->ts.derived->attr.is_c_interop != 1)
9668 /* Make sure the user marked the derived type as BIND(C). If
9669 not, call the verify routine. This could print an error
9670 for the derived type more than once if multiple variables
9671 of that type are declared. */
9672 if (sym->ts.derived->attr.is_bind_c != 1)
9673 verify_bind_c_derived_type (sym->ts.derived);
9677 /* Verify the variable itself as C interoperable if it
9678 is BIND(C). It is not possible for this to succeed if
9679 the verify_bind_c_derived_type failed, so don't have to handle
9680 any error returned by verify_bind_c_derived_type. */
9681 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9687 /* clear the is_bind_c flag to prevent reporting errors more than
9688 once if something failed. */
9689 sym->attr.is_bind_c = 0;
9694 /* If a derived type symbol has reached this point, without its
9695 type being declared, we have an error. Notice that most
9696 conditions that produce undefined derived types have already
9697 been dealt with. However, the likes of:
9698 implicit type(t) (t) ..... call foo (t) will get us here if
9699 the type is not declared in the scope of the implicit
9700 statement. Change the type to BT_UNKNOWN, both because it is so
9701 and to prevent an ICE. */
9702 if (sym->ts.type == BT_DERIVED && sym->ts.derived->components == NULL
9703 && !sym->ts.derived->attr.zero_comp)
9705 gfc_error ("The derived type '%s' at %L is of type '%s', "
9706 "which has not been defined", sym->name,
9707 &sym->declared_at, sym->ts.derived->name);
9708 sym->ts.type = BT_UNKNOWN;
9712 /* Make sure that the derived type has been resolved and that the
9713 derived type is visible in the symbol's namespace, if it is a
9714 module function and is not PRIVATE. */
9715 if (sym->ts.type == BT_DERIVED
9716 && sym->ts.derived->attr.use_assoc
9717 && sym->ns->proc_name
9718 && sym->ns->proc_name->attr.flavor == FL_MODULE)
9722 if (resolve_fl_derived (sym->ts.derived) == FAILURE)
9725 gfc_find_symbol (sym->ts.derived->name, sym->ns, 1, &ds);
9726 if (!ds && sym->attr.function
9727 && gfc_check_access (sym->attr.access, sym->ns->default_access))
9729 symtree = gfc_new_symtree (&sym->ns->sym_root,
9730 sym->ts.derived->name);
9731 symtree->n.sym = sym->ts.derived;
9732 sym->ts.derived->refs++;
9736 /* Unless the derived-type declaration is use associated, Fortran 95
9737 does not allow public entries of private derived types.
9738 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
9740 if (sym->ts.type == BT_DERIVED
9741 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
9742 && !sym->ts.derived->attr.use_assoc
9743 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9744 && !gfc_check_access (sym->ts.derived->attr.access,
9745 sym->ts.derived->ns->default_access)
9746 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
9747 "of PRIVATE derived type '%s'",
9748 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
9749 : "variable", sym->name, &sym->declared_at,
9750 sym->ts.derived->name) == FAILURE)
9753 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
9754 default initialization is defined (5.1.2.4.4). */
9755 if (sym->ts.type == BT_DERIVED
9757 && sym->attr.intent == INTENT_OUT
9759 && sym->as->type == AS_ASSUMED_SIZE)
9761 for (c = sym->ts.derived->components; c; c = c->next)
9765 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
9766 "ASSUMED SIZE and so cannot have a default initializer",
9767 sym->name, &sym->declared_at);
9773 switch (sym->attr.flavor)
9776 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
9781 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
9786 if (resolve_fl_namelist (sym) == FAILURE)
9791 if (resolve_fl_parameter (sym) == FAILURE)
9799 /* Resolve array specifier. Check as well some constraints
9800 on COMMON blocks. */
9802 check_constant = sym->attr.in_common && !sym->attr.pointer;
9804 /* Set the formal_arg_flag so that check_conflict will not throw
9805 an error for host associated variables in the specification
9806 expression for an array_valued function. */
9807 if (sym->attr.function && sym->as)
9808 formal_arg_flag = 1;
9810 gfc_resolve_array_spec (sym->as, check_constant);
9812 formal_arg_flag = 0;
9814 /* Resolve formal namespaces. */
9815 if (sym->formal_ns && sym->formal_ns != gfc_current_ns)
9816 gfc_resolve (sym->formal_ns);
9818 /* Check threadprivate restrictions. */
9819 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
9820 && (!sym->attr.in_common
9821 && sym->module == NULL
9822 && (sym->ns->proc_name == NULL
9823 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
9824 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
9826 /* If we have come this far we can apply default-initializers, as
9827 described in 14.7.5, to those variables that have not already
9828 been assigned one. */
9829 if (sym->ts.type == BT_DERIVED
9830 && sym->attr.referenced
9831 && sym->ns == gfc_current_ns
9833 && !sym->attr.allocatable
9834 && !sym->attr.alloc_comp)
9836 symbol_attribute *a = &sym->attr;
9838 if ((!a->save && !a->dummy && !a->pointer
9839 && !a->in_common && !a->use_assoc
9840 && !(a->function && sym != sym->result))
9841 || (a->dummy && a->intent == INTENT_OUT))
9842 apply_default_init (sym);
9845 /* If this symbol has a type-spec, check it. */
9846 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
9847 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
9848 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
9854 /************* Resolve DATA statements *************/
9858 gfc_data_value *vnode;
9864 /* Advance the values structure to point to the next value in the data list. */
9867 next_data_value (void)
9869 while (mpz_cmp_ui (values.left, 0) == 0)
9871 if (!gfc_is_constant_expr (values.vnode->expr))
9872 gfc_error ("non-constant DATA value at %L",
9873 &values.vnode->expr->where);
9875 if (values.vnode->next == NULL)
9878 values.vnode = values.vnode->next;
9879 mpz_set (values.left, values.vnode->repeat);
9887 check_data_variable (gfc_data_variable *var, locus *where)
9893 ar_type mark = AR_UNKNOWN;
9895 mpz_t section_index[GFC_MAX_DIMENSIONS];
9901 if (gfc_resolve_expr (var->expr) == FAILURE)
9905 mpz_init_set_si (offset, 0);
9908 if (e->expr_type != EXPR_VARIABLE)
9909 gfc_internal_error ("check_data_variable(): Bad expression");
9911 sym = e->symtree->n.sym;
9913 if (sym->ns->is_block_data && !sym->attr.in_common)
9915 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
9916 sym->name, &sym->declared_at);
9919 if (e->ref == NULL && sym->as)
9921 gfc_error ("DATA array '%s' at %L must be specified in a previous"
9922 " declaration", sym->name, where);
9926 has_pointer = sym->attr.pointer;
9928 for (ref = e->ref; ref; ref = ref->next)
9930 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
9934 && ref->type == REF_ARRAY
9935 && ref->u.ar.type != AR_FULL)
9937 gfc_error ("DATA element '%s' at %L is a pointer and so must "
9938 "be a full array", sym->name, where);
9943 if (e->rank == 0 || has_pointer)
9945 mpz_init_set_ui (size, 1);
9952 /* Find the array section reference. */
9953 for (ref = e->ref; ref; ref = ref->next)
9955 if (ref->type != REF_ARRAY)
9957 if (ref->u.ar.type == AR_ELEMENT)
9963 /* Set marks according to the reference pattern. */
9964 switch (ref->u.ar.type)
9972 /* Get the start position of array section. */
9973 gfc_get_section_index (ar, section_index, &offset);
9981 if (gfc_array_size (e, &size) == FAILURE)
9983 gfc_error ("Nonconstant array section at %L in DATA statement",
9992 while (mpz_cmp_ui (size, 0) > 0)
9994 if (next_data_value () == FAILURE)
9996 gfc_error ("DATA statement at %L has more variables than values",
10002 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
10006 /* If we have more than one element left in the repeat count,
10007 and we have more than one element left in the target variable,
10008 then create a range assignment. */
10009 /* FIXME: Only done for full arrays for now, since array sections
10011 if (mark == AR_FULL && ref && ref->next == NULL
10012 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
10016 if (mpz_cmp (size, values.left) >= 0)
10018 mpz_init_set (range, values.left);
10019 mpz_sub (size, size, values.left);
10020 mpz_set_ui (values.left, 0);
10024 mpz_init_set (range, size);
10025 mpz_sub (values.left, values.left, size);
10026 mpz_set_ui (size, 0);
10029 gfc_assign_data_value_range (var->expr, values.vnode->expr,
10032 mpz_add (offset, offset, range);
10036 /* Assign initial value to symbol. */
10039 mpz_sub_ui (values.left, values.left, 1);
10040 mpz_sub_ui (size, size, 1);
10042 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
10046 if (mark == AR_FULL)
10047 mpz_add_ui (offset, offset, 1);
10049 /* Modify the array section indexes and recalculate the offset
10050 for next element. */
10051 else if (mark == AR_SECTION)
10052 gfc_advance_section (section_index, ar, &offset);
10056 if (mark == AR_SECTION)
10058 for (i = 0; i < ar->dimen; i++)
10059 mpz_clear (section_index[i]);
10063 mpz_clear (offset);
10069 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
10071 /* Iterate over a list of elements in a DATA statement. */
10074 traverse_data_list (gfc_data_variable *var, locus *where)
10077 iterator_stack frame;
10078 gfc_expr *e, *start, *end, *step;
10079 gfc_try retval = SUCCESS;
10081 mpz_init (frame.value);
10083 start = gfc_copy_expr (var->iter.start);
10084 end = gfc_copy_expr (var->iter.end);
10085 step = gfc_copy_expr (var->iter.step);
10087 if (gfc_simplify_expr (start, 1) == FAILURE
10088 || start->expr_type != EXPR_CONSTANT)
10090 gfc_error ("iterator start at %L does not simplify", &start->where);
10094 if (gfc_simplify_expr (end, 1) == FAILURE
10095 || end->expr_type != EXPR_CONSTANT)
10097 gfc_error ("iterator end at %L does not simplify", &end->where);
10101 if (gfc_simplify_expr (step, 1) == FAILURE
10102 || step->expr_type != EXPR_CONSTANT)
10104 gfc_error ("iterator step at %L does not simplify", &step->where);
10109 mpz_init_set (trip, end->value.integer);
10110 mpz_sub (trip, trip, start->value.integer);
10111 mpz_add (trip, trip, step->value.integer);
10113 mpz_div (trip, trip, step->value.integer);
10115 mpz_set (frame.value, start->value.integer);
10117 frame.prev = iter_stack;
10118 frame.variable = var->iter.var->symtree;
10119 iter_stack = &frame;
10121 while (mpz_cmp_ui (trip, 0) > 0)
10123 if (traverse_data_var (var->list, where) == FAILURE)
10130 e = gfc_copy_expr (var->expr);
10131 if (gfc_simplify_expr (e, 1) == FAILURE)
10139 mpz_add (frame.value, frame.value, step->value.integer);
10141 mpz_sub_ui (trip, trip, 1);
10146 mpz_clear (frame.value);
10148 gfc_free_expr (start);
10149 gfc_free_expr (end);
10150 gfc_free_expr (step);
10152 iter_stack = frame.prev;
10157 /* Type resolve variables in the variable list of a DATA statement. */
10160 traverse_data_var (gfc_data_variable *var, locus *where)
10164 for (; var; var = var->next)
10166 if (var->expr == NULL)
10167 t = traverse_data_list (var, where);
10169 t = check_data_variable (var, where);
10179 /* Resolve the expressions and iterators associated with a data statement.
10180 This is separate from the assignment checking because data lists should
10181 only be resolved once. */
10184 resolve_data_variables (gfc_data_variable *d)
10186 for (; d; d = d->next)
10188 if (d->list == NULL)
10190 if (gfc_resolve_expr (d->expr) == FAILURE)
10195 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
10198 if (resolve_data_variables (d->list) == FAILURE)
10207 /* Resolve a single DATA statement. We implement this by storing a pointer to
10208 the value list into static variables, and then recursively traversing the
10209 variables list, expanding iterators and such. */
10212 resolve_data (gfc_data *d)
10215 if (resolve_data_variables (d->var) == FAILURE)
10218 values.vnode = d->value;
10219 if (d->value == NULL)
10220 mpz_set_ui (values.left, 0);
10222 mpz_set (values.left, d->value->repeat);
10224 if (traverse_data_var (d->var, &d->where) == FAILURE)
10227 /* At this point, we better not have any values left. */
10229 if (next_data_value () == SUCCESS)
10230 gfc_error ("DATA statement at %L has more values than variables",
10235 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
10236 accessed by host or use association, is a dummy argument to a pure function,
10237 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
10238 is storage associated with any such variable, shall not be used in the
10239 following contexts: (clients of this function). */
10241 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
10242 procedure. Returns zero if assignment is OK, nonzero if there is a
10245 gfc_impure_variable (gfc_symbol *sym)
10249 if (sym->attr.use_assoc || sym->attr.in_common)
10252 if (sym->ns != gfc_current_ns)
10253 return !sym->attr.function;
10255 proc = sym->ns->proc_name;
10256 if (sym->attr.dummy && gfc_pure (proc)
10257 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
10259 proc->attr.function))
10262 /* TODO: Sort out what can be storage associated, if anything, and include
10263 it here. In principle equivalences should be scanned but it does not
10264 seem to be possible to storage associate an impure variable this way. */
10269 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
10270 symbol of the current procedure. */
10273 gfc_pure (gfc_symbol *sym)
10275 symbol_attribute attr;
10278 sym = gfc_current_ns->proc_name;
10284 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
10288 /* Test whether the current procedure is elemental or not. */
10291 gfc_elemental (gfc_symbol *sym)
10293 symbol_attribute attr;
10296 sym = gfc_current_ns->proc_name;
10301 return attr.flavor == FL_PROCEDURE && attr.elemental;
10305 /* Warn about unused labels. */
10308 warn_unused_fortran_label (gfc_st_label *label)
10313 warn_unused_fortran_label (label->left);
10315 if (label->defined == ST_LABEL_UNKNOWN)
10318 switch (label->referenced)
10320 case ST_LABEL_UNKNOWN:
10321 gfc_warning ("Label %d at %L defined but not used", label->value,
10325 case ST_LABEL_BAD_TARGET:
10326 gfc_warning ("Label %d at %L defined but cannot be used",
10327 label->value, &label->where);
10334 warn_unused_fortran_label (label->right);
10338 /* Returns the sequence type of a symbol or sequence. */
10341 sequence_type (gfc_typespec ts)
10350 if (ts.derived->components == NULL)
10351 return SEQ_NONDEFAULT;
10353 result = sequence_type (ts.derived->components->ts);
10354 for (c = ts.derived->components->next; c; c = c->next)
10355 if (sequence_type (c->ts) != result)
10361 if (ts.kind != gfc_default_character_kind)
10362 return SEQ_NONDEFAULT;
10364 return SEQ_CHARACTER;
10367 if (ts.kind != gfc_default_integer_kind)
10368 return SEQ_NONDEFAULT;
10370 return SEQ_NUMERIC;
10373 if (!(ts.kind == gfc_default_real_kind
10374 || ts.kind == gfc_default_double_kind))
10375 return SEQ_NONDEFAULT;
10377 return SEQ_NUMERIC;
10380 if (ts.kind != gfc_default_complex_kind)
10381 return SEQ_NONDEFAULT;
10383 return SEQ_NUMERIC;
10386 if (ts.kind != gfc_default_logical_kind)
10387 return SEQ_NONDEFAULT;
10389 return SEQ_NUMERIC;
10392 return SEQ_NONDEFAULT;
10397 /* Resolve derived type EQUIVALENCE object. */
10400 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
10403 gfc_component *c = derived->components;
10408 /* Shall not be an object of nonsequence derived type. */
10409 if (!derived->attr.sequence)
10411 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
10412 "attribute to be an EQUIVALENCE object", sym->name,
10417 /* Shall not have allocatable components. */
10418 if (derived->attr.alloc_comp)
10420 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
10421 "components to be an EQUIVALENCE object",sym->name,
10426 if (sym->attr.in_common && has_default_initializer (sym->ts.derived))
10428 gfc_error ("Derived type variable '%s' at %L with default "
10429 "initialization cannot be in EQUIVALENCE with a variable "
10430 "in COMMON", sym->name, &e->where);
10434 for (; c ; c = c->next)
10438 && (resolve_equivalence_derived (c->ts.derived, sym, e) == FAILURE))
10441 /* Shall not be an object of sequence derived type containing a pointer
10442 in the structure. */
10443 if (c->attr.pointer)
10445 gfc_error ("Derived type variable '%s' at %L with pointer "
10446 "component(s) cannot be an EQUIVALENCE object",
10447 sym->name, &e->where);
10455 /* Resolve equivalence object.
10456 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
10457 an allocatable array, an object of nonsequence derived type, an object of
10458 sequence derived type containing a pointer at any level of component
10459 selection, an automatic object, a function name, an entry name, a result
10460 name, a named constant, a structure component, or a subobject of any of
10461 the preceding objects. A substring shall not have length zero. A
10462 derived type shall not have components with default initialization nor
10463 shall two objects of an equivalence group be initialized.
10464 Either all or none of the objects shall have an protected attribute.
10465 The simple constraints are done in symbol.c(check_conflict) and the rest
10466 are implemented here. */
10469 resolve_equivalence (gfc_equiv *eq)
10472 gfc_symbol *derived;
10473 gfc_symbol *first_sym;
10476 locus *last_where = NULL;
10477 seq_type eq_type, last_eq_type;
10478 gfc_typespec *last_ts;
10479 int object, cnt_protected;
10480 const char *value_name;
10484 last_ts = &eq->expr->symtree->n.sym->ts;
10486 first_sym = eq->expr->symtree->n.sym;
10490 for (object = 1; eq; eq = eq->eq, object++)
10494 e->ts = e->symtree->n.sym->ts;
10495 /* match_varspec might not know yet if it is seeing
10496 array reference or substring reference, as it doesn't
10498 if (e->ref && e->ref->type == REF_ARRAY)
10500 gfc_ref *ref = e->ref;
10501 sym = e->symtree->n.sym;
10503 if (sym->attr.dimension)
10505 ref->u.ar.as = sym->as;
10509 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
10510 if (e->ts.type == BT_CHARACTER
10512 && ref->type == REF_ARRAY
10513 && ref->u.ar.dimen == 1
10514 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
10515 && ref->u.ar.stride[0] == NULL)
10517 gfc_expr *start = ref->u.ar.start[0];
10518 gfc_expr *end = ref->u.ar.end[0];
10521 /* Optimize away the (:) reference. */
10522 if (start == NULL && end == NULL)
10525 e->ref = ref->next;
10527 e->ref->next = ref->next;
10532 ref->type = REF_SUBSTRING;
10534 start = gfc_int_expr (1);
10535 ref->u.ss.start = start;
10536 if (end == NULL && e->ts.cl)
10537 end = gfc_copy_expr (e->ts.cl->length);
10538 ref->u.ss.end = end;
10539 ref->u.ss.length = e->ts.cl;
10546 /* Any further ref is an error. */
10549 gcc_assert (ref->type == REF_ARRAY);
10550 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
10556 if (gfc_resolve_expr (e) == FAILURE)
10559 sym = e->symtree->n.sym;
10561 if (sym->attr.is_protected)
10563 if (cnt_protected > 0 && cnt_protected != object)
10565 gfc_error ("Either all or none of the objects in the "
10566 "EQUIVALENCE set at %L shall have the "
10567 "PROTECTED attribute",
10572 /* Shall not equivalence common block variables in a PURE procedure. */
10573 if (sym->ns->proc_name
10574 && sym->ns->proc_name->attr.pure
10575 && sym->attr.in_common)
10577 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
10578 "object in the pure procedure '%s'",
10579 sym->name, &e->where, sym->ns->proc_name->name);
10583 /* Shall not be a named constant. */
10584 if (e->expr_type == EXPR_CONSTANT)
10586 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
10587 "object", sym->name, &e->where);
10591 derived = e->ts.derived;
10592 if (derived && resolve_equivalence_derived (derived, sym, e) == FAILURE)
10595 /* Check that the types correspond correctly:
10597 A numeric sequence structure may be equivalenced to another sequence
10598 structure, an object of default integer type, default real type, double
10599 precision real type, default logical type such that components of the
10600 structure ultimately only become associated to objects of the same
10601 kind. A character sequence structure may be equivalenced to an object
10602 of default character kind or another character sequence structure.
10603 Other objects may be equivalenced only to objects of the same type and
10604 kind parameters. */
10606 /* Identical types are unconditionally OK. */
10607 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
10608 goto identical_types;
10610 last_eq_type = sequence_type (*last_ts);
10611 eq_type = sequence_type (sym->ts);
10613 /* Since the pair of objects is not of the same type, mixed or
10614 non-default sequences can be rejected. */
10616 msg = "Sequence %s with mixed components in EQUIVALENCE "
10617 "statement at %L with different type objects";
10619 && last_eq_type == SEQ_MIXED
10620 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
10622 || (eq_type == SEQ_MIXED
10623 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10624 &e->where) == FAILURE))
10627 msg = "Non-default type object or sequence %s in EQUIVALENCE "
10628 "statement at %L with objects of different type";
10630 && last_eq_type == SEQ_NONDEFAULT
10631 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
10632 last_where) == FAILURE)
10633 || (eq_type == SEQ_NONDEFAULT
10634 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10635 &e->where) == FAILURE))
10638 msg ="Non-CHARACTER object '%s' in default CHARACTER "
10639 "EQUIVALENCE statement at %L";
10640 if (last_eq_type == SEQ_CHARACTER
10641 && eq_type != SEQ_CHARACTER
10642 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10643 &e->where) == FAILURE)
10646 msg ="Non-NUMERIC object '%s' in default NUMERIC "
10647 "EQUIVALENCE statement at %L";
10648 if (last_eq_type == SEQ_NUMERIC
10649 && eq_type != SEQ_NUMERIC
10650 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10651 &e->where) == FAILURE)
10656 last_where = &e->where;
10661 /* Shall not be an automatic array. */
10662 if (e->ref->type == REF_ARRAY
10663 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
10665 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
10666 "an EQUIVALENCE object", sym->name, &e->where);
10673 /* Shall not be a structure component. */
10674 if (r->type == REF_COMPONENT)
10676 gfc_error ("Structure component '%s' at %L cannot be an "
10677 "EQUIVALENCE object",
10678 r->u.c.component->name, &e->where);
10682 /* A substring shall not have length zero. */
10683 if (r->type == REF_SUBSTRING)
10685 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
10687 gfc_error ("Substring at %L has length zero",
10688 &r->u.ss.start->where);
10698 /* Resolve function and ENTRY types, issue diagnostics if needed. */
10701 resolve_fntype (gfc_namespace *ns)
10703 gfc_entry_list *el;
10706 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
10709 /* If there are any entries, ns->proc_name is the entry master
10710 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
10712 sym = ns->entries->sym;
10714 sym = ns->proc_name;
10715 if (sym->result == sym
10716 && sym->ts.type == BT_UNKNOWN
10717 && gfc_set_default_type (sym, 0, NULL) == FAILURE
10718 && !sym->attr.untyped)
10720 gfc_error ("Function '%s' at %L has no IMPLICIT type",
10721 sym->name, &sym->declared_at);
10722 sym->attr.untyped = 1;
10725 if (sym->ts.type == BT_DERIVED && !sym->ts.derived->attr.use_assoc
10726 && !sym->attr.contained
10727 && !gfc_check_access (sym->ts.derived->attr.access,
10728 sym->ts.derived->ns->default_access)
10729 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10731 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
10732 "%L of PRIVATE type '%s'", sym->name,
10733 &sym->declared_at, sym->ts.derived->name);
10737 for (el = ns->entries->next; el; el = el->next)
10739 if (el->sym->result == el->sym
10740 && el->sym->ts.type == BT_UNKNOWN
10741 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
10742 && !el->sym->attr.untyped)
10744 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
10745 el->sym->name, &el->sym->declared_at);
10746 el->sym->attr.untyped = 1;
10751 /* 12.3.2.1.1 Defined operators. */
10754 gfc_resolve_uops (gfc_symtree *symtree)
10756 gfc_interface *itr;
10758 gfc_formal_arglist *formal;
10760 if (symtree == NULL)
10763 gfc_resolve_uops (symtree->left);
10764 gfc_resolve_uops (symtree->right);
10766 for (itr = symtree->n.uop->op; itr; itr = itr->next)
10769 if (!sym->attr.function)
10770 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
10771 sym->name, &sym->declared_at);
10773 if (sym->ts.type == BT_CHARACTER
10774 && !(sym->ts.cl && sym->ts.cl->length)
10775 && !(sym->result && sym->result->ts.cl
10776 && sym->result->ts.cl->length))
10777 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
10778 "character length", sym->name, &sym->declared_at);
10780 formal = sym->formal;
10781 if (!formal || !formal->sym)
10783 gfc_error ("User operator procedure '%s' at %L must have at least "
10784 "one argument", sym->name, &sym->declared_at);
10788 if (formal->sym->attr.intent != INTENT_IN)
10789 gfc_error ("First argument of operator interface at %L must be "
10790 "INTENT(IN)", &sym->declared_at);
10792 if (formal->sym->attr.optional)
10793 gfc_error ("First argument of operator interface at %L cannot be "
10794 "optional", &sym->declared_at);
10796 formal = formal->next;
10797 if (!formal || !formal->sym)
10800 if (formal->sym->attr.intent != INTENT_IN)
10801 gfc_error ("Second argument of operator interface at %L must be "
10802 "INTENT(IN)", &sym->declared_at);
10804 if (formal->sym->attr.optional)
10805 gfc_error ("Second argument of operator interface at %L cannot be "
10806 "optional", &sym->declared_at);
10809 gfc_error ("Operator interface at %L must have, at most, two "
10810 "arguments", &sym->declared_at);
10815 /* Examine all of the expressions associated with a program unit,
10816 assign types to all intermediate expressions, make sure that all
10817 assignments are to compatible types and figure out which names
10818 refer to which functions or subroutines. It doesn't check code
10819 block, which is handled by resolve_code. */
10822 resolve_types (gfc_namespace *ns)
10828 gfc_namespace* old_ns = gfc_current_ns;
10830 /* Check that all IMPLICIT types are ok. */
10831 if (!ns->seen_implicit_none)
10834 for (letter = 0; letter != GFC_LETTERS; ++letter)
10835 if (ns->set_flag[letter]
10836 && resolve_typespec_used (&ns->default_type[letter],
10837 &ns->implicit_loc[letter],
10842 gfc_current_ns = ns;
10844 resolve_entries (ns);
10846 resolve_common_vars (ns->blank_common.head, false);
10847 resolve_common_blocks (ns->common_root);
10849 resolve_contained_functions (ns);
10851 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
10853 for (cl = ns->cl_list; cl; cl = cl->next)
10854 resolve_charlen (cl);
10856 gfc_traverse_ns (ns, resolve_symbol);
10858 resolve_fntype (ns);
10860 for (n = ns->contained; n; n = n->sibling)
10862 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
10863 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
10864 "also be PURE", n->proc_name->name,
10865 &n->proc_name->declared_at);
10871 gfc_check_interfaces (ns);
10873 gfc_traverse_ns (ns, resolve_values);
10879 for (d = ns->data; d; d = d->next)
10883 gfc_traverse_ns (ns, gfc_formalize_init_value);
10885 gfc_traverse_ns (ns, gfc_verify_binding_labels);
10887 if (ns->common_root != NULL)
10888 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
10890 for (eq = ns->equiv; eq; eq = eq->next)
10891 resolve_equivalence (eq);
10893 /* Warn about unused labels. */
10894 if (warn_unused_label)
10895 warn_unused_fortran_label (ns->st_labels);
10897 gfc_resolve_uops (ns->uop_root);
10899 gfc_current_ns = old_ns;
10903 /* Call resolve_code recursively. */
10906 resolve_codes (gfc_namespace *ns)
10909 bitmap_obstack old_obstack;
10911 for (n = ns->contained; n; n = n->sibling)
10914 gfc_current_ns = ns;
10916 /* Set to an out of range value. */
10917 current_entry_id = -1;
10919 old_obstack = labels_obstack;
10920 bitmap_obstack_initialize (&labels_obstack);
10922 resolve_code (ns->code, ns);
10924 bitmap_obstack_release (&labels_obstack);
10925 labels_obstack = old_obstack;
10929 /* This function is called after a complete program unit has been compiled.
10930 Its purpose is to examine all of the expressions associated with a program
10931 unit, assign types to all intermediate expressions, make sure that all
10932 assignments are to compatible types and figure out which names refer to
10933 which functions or subroutines. */
10936 gfc_resolve (gfc_namespace *ns)
10938 gfc_namespace *old_ns;
10943 old_ns = gfc_current_ns;
10945 resolve_types (ns);
10946 resolve_codes (ns);
10948 gfc_current_ns = old_ns;