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->ts = sym->result->ts;
1835 expr->value.function.name = sym->name;
1836 expr->value.function.esym = sym;
1837 if (sym->as != NULL)
1838 expr->rank = sym->as->rank;
1845 resolve_specific_f (gfc_expr *expr)
1850 sym = expr->symtree->n.sym;
1854 m = resolve_specific_f0 (sym, expr);
1857 if (m == MATCH_ERROR)
1860 if (sym->ns->parent == NULL)
1863 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1869 gfc_error ("Unable to resolve the specific function '%s' at %L",
1870 expr->symtree->n.sym->name, &expr->where);
1876 /* Resolve a procedure call not known to be generic nor specific. */
1879 resolve_unknown_f (gfc_expr *expr)
1884 sym = expr->symtree->n.sym;
1886 if (sym->attr.dummy)
1888 sym->attr.proc = PROC_DUMMY;
1889 expr->value.function.name = sym->name;
1893 /* See if we have an intrinsic function reference. */
1895 if (gfc_is_intrinsic (sym, 0, expr->where))
1897 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
1902 /* The reference is to an external name. */
1904 sym->attr.proc = PROC_EXTERNAL;
1905 expr->value.function.name = sym->name;
1906 expr->value.function.esym = expr->symtree->n.sym;
1908 if (sym->as != NULL)
1909 expr->rank = sym->as->rank;
1911 /* Type of the expression is either the type of the symbol or the
1912 default type of the symbol. */
1915 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1917 if (sym->ts.type != BT_UNKNOWN)
1921 ts = gfc_get_default_type (sym->name, sym->ns);
1923 if (ts->type == BT_UNKNOWN)
1925 gfc_error ("Function '%s' at %L has no IMPLICIT type",
1926 sym->name, &expr->where);
1937 /* Return true, if the symbol is an external procedure. */
1939 is_external_proc (gfc_symbol *sym)
1941 if (!sym->attr.dummy && !sym->attr.contained
1942 && !(sym->attr.intrinsic
1943 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
1944 && sym->attr.proc != PROC_ST_FUNCTION
1945 && !sym->attr.use_assoc
1953 /* Figure out if a function reference is pure or not. Also set the name
1954 of the function for a potential error message. Return nonzero if the
1955 function is PURE, zero if not. */
1957 pure_stmt_function (gfc_expr *, gfc_symbol *);
1960 pure_function (gfc_expr *e, const char **name)
1966 if (e->symtree != NULL
1967 && e->symtree->n.sym != NULL
1968 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
1969 return pure_stmt_function (e, e->symtree->n.sym);
1971 if (e->value.function.esym)
1973 pure = gfc_pure (e->value.function.esym);
1974 *name = e->value.function.esym->name;
1976 else if (e->value.function.isym)
1978 pure = e->value.function.isym->pure
1979 || e->value.function.isym->elemental;
1980 *name = e->value.function.isym->name;
1984 /* Implicit functions are not pure. */
1986 *name = e->value.function.name;
1994 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
1995 int *f ATTRIBUTE_UNUSED)
1999 /* Don't bother recursing into other statement functions
2000 since they will be checked individually for purity. */
2001 if (e->expr_type != EXPR_FUNCTION
2003 || e->symtree->n.sym == sym
2004 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2007 return pure_function (e, &name) ? false : true;
2012 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2014 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2019 is_scalar_expr_ptr (gfc_expr *expr)
2021 gfc_try retval = SUCCESS;
2026 /* See if we have a gfc_ref, which means we have a substring, array
2027 reference, or a component. */
2028 if (expr->ref != NULL)
2031 while (ref->next != NULL)
2037 if (ref->u.ss.length != NULL
2038 && ref->u.ss.length->length != NULL
2040 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2042 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2044 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2045 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2046 if (end - start + 1 != 1)
2053 if (ref->u.ar.type == AR_ELEMENT)
2055 else if (ref->u.ar.type == AR_FULL)
2057 /* The user can give a full array if the array is of size 1. */
2058 if (ref->u.ar.as != NULL
2059 && ref->u.ar.as->rank == 1
2060 && ref->u.ar.as->type == AS_EXPLICIT
2061 && ref->u.ar.as->lower[0] != NULL
2062 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2063 && ref->u.ar.as->upper[0] != NULL
2064 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2066 /* If we have a character string, we need to check if
2067 its length is one. */
2068 if (expr->ts.type == BT_CHARACTER)
2070 if (expr->ts.cl == NULL
2071 || expr->ts.cl->length == NULL
2072 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1)
2078 /* We have constant lower and upper bounds. If the
2079 difference between is 1, it can be considered a
2081 start = (int) mpz_get_si
2082 (ref->u.ar.as->lower[0]->value.integer);
2083 end = (int) mpz_get_si
2084 (ref->u.ar.as->upper[0]->value.integer);
2085 if (end - start + 1 != 1)
2100 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2102 /* Character string. Make sure it's of length 1. */
2103 if (expr->ts.cl == NULL
2104 || expr->ts.cl->length == NULL
2105 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1) != 0)
2108 else if (expr->rank != 0)
2115 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2116 and, in the case of c_associated, set the binding label based on
2120 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2121 gfc_symbol **new_sym)
2123 char name[GFC_MAX_SYMBOL_LEN + 1];
2124 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2125 int optional_arg = 0, is_pointer = 0;
2126 gfc_try retval = SUCCESS;
2127 gfc_symbol *args_sym;
2128 gfc_typespec *arg_ts;
2130 if (args->expr->expr_type == EXPR_CONSTANT
2131 || args->expr->expr_type == EXPR_OP
2132 || args->expr->expr_type == EXPR_NULL)
2134 gfc_error ("Argument to '%s' at %L is not a variable",
2135 sym->name, &(args->expr->where));
2139 args_sym = args->expr->symtree->n.sym;
2141 /* The typespec for the actual arg should be that stored in the expr
2142 and not necessarily that of the expr symbol (args_sym), because
2143 the actual expression could be a part-ref of the expr symbol. */
2144 arg_ts = &(args->expr->ts);
2146 is_pointer = gfc_is_data_pointer (args->expr);
2148 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2150 /* If the user gave two args then they are providing something for
2151 the optional arg (the second cptr). Therefore, set the name and
2152 binding label to the c_associated for two cptrs. Otherwise,
2153 set c_associated to expect one cptr. */
2157 sprintf (name, "%s_2", sym->name);
2158 sprintf (binding_label, "%s_2", sym->binding_label);
2164 sprintf (name, "%s_1", sym->name);
2165 sprintf (binding_label, "%s_1", sym->binding_label);
2169 /* Get a new symbol for the version of c_associated that
2171 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2173 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2174 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2176 sprintf (name, "%s", sym->name);
2177 sprintf (binding_label, "%s", sym->binding_label);
2179 /* Error check the call. */
2180 if (args->next != NULL)
2182 gfc_error_now ("More actual than formal arguments in '%s' "
2183 "call at %L", name, &(args->expr->where));
2186 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2188 /* Make sure we have either the target or pointer attribute. */
2189 if (!args_sym->attr.target && !is_pointer)
2191 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2192 "a TARGET or an associated pointer",
2194 sym->name, &(args->expr->where));
2198 /* See if we have interoperable type and type param. */
2199 if (verify_c_interop (arg_ts) == SUCCESS
2200 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2202 if (args_sym->attr.target == 1)
2204 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2205 has the target attribute and is interoperable. */
2206 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2207 allocatable variable that has the TARGET attribute and
2208 is not an array of zero size. */
2209 if (args_sym->attr.allocatable == 1)
2211 if (args_sym->attr.dimension != 0
2212 && (args_sym->as && args_sym->as->rank == 0))
2214 gfc_error_now ("Allocatable variable '%s' used as a "
2215 "parameter to '%s' at %L must not be "
2216 "an array of zero size",
2217 args_sym->name, sym->name,
2218 &(args->expr->where));
2224 /* A non-allocatable target variable with C
2225 interoperable type and type parameters must be
2227 if (args_sym && args_sym->attr.dimension)
2229 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2231 gfc_error ("Assumed-shape array '%s' at %L "
2232 "cannot be an argument to the "
2233 "procedure '%s' because "
2234 "it is not C interoperable",
2236 &(args->expr->where), sym->name);
2239 else if (args_sym->as->type == AS_DEFERRED)
2241 gfc_error ("Deferred-shape array '%s' at %L "
2242 "cannot be an argument to the "
2243 "procedure '%s' because "
2244 "it is not C interoperable",
2246 &(args->expr->where), sym->name);
2251 /* Make sure it's not a character string. Arrays of
2252 any type should be ok if the variable is of a C
2253 interoperable type. */
2254 if (arg_ts->type == BT_CHARACTER)
2255 if (arg_ts->cl != NULL
2256 && (arg_ts->cl->length == NULL
2257 || arg_ts->cl->length->expr_type
2260 (arg_ts->cl->length->value.integer, 1)
2262 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2264 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2265 "at %L must have a length of 1",
2266 args_sym->name, sym->name,
2267 &(args->expr->where));
2273 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2275 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2277 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2278 "associated scalar POINTER", args_sym->name,
2279 sym->name, &(args->expr->where));
2285 /* The parameter is not required to be C interoperable. If it
2286 is not C interoperable, it must be a nonpolymorphic scalar
2287 with no length type parameters. It still must have either
2288 the pointer or target attribute, and it can be
2289 allocatable (but must be allocated when c_loc is called). */
2290 if (args->expr->rank != 0
2291 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2293 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2294 "scalar", args_sym->name, sym->name,
2295 &(args->expr->where));
2298 else if (arg_ts->type == BT_CHARACTER
2299 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2301 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2302 "%L must have a length of 1",
2303 args_sym->name, sym->name,
2304 &(args->expr->where));
2309 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2311 if (args_sym->attr.flavor != FL_PROCEDURE)
2313 /* TODO: Update this error message to allow for procedure
2314 pointers once they are implemented. */
2315 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2317 args_sym->name, sym->name,
2318 &(args->expr->where));
2321 else if (args_sym->attr.is_bind_c != 1)
2323 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2325 args_sym->name, sym->name,
2326 &(args->expr->where));
2331 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2336 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2337 "iso_c_binding function: '%s'!\n", sym->name);
2344 /* Resolve a function call, which means resolving the arguments, then figuring
2345 out which entity the name refers to. */
2346 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2347 to INTENT(OUT) or INTENT(INOUT). */
2350 resolve_function (gfc_expr *expr)
2352 gfc_actual_arglist *arg;
2357 procedure_type p = PROC_INTRINSIC;
2358 bool no_formal_args;
2362 sym = expr->symtree->n.sym;
2364 if (sym && sym->attr.intrinsic
2365 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2368 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2370 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2374 if (sym && sym->attr.abstract)
2376 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2377 sym->name, &expr->where);
2381 /* Switch off assumed size checking and do this again for certain kinds
2382 of procedure, once the procedure itself is resolved. */
2383 need_full_assumed_size++;
2385 if (expr->symtree && expr->symtree->n.sym)
2386 p = expr->symtree->n.sym->attr.proc;
2388 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2389 if (resolve_actual_arglist (expr->value.function.actual,
2390 p, no_formal_args) == FAILURE)
2393 /* Need to setup the call to the correct c_associated, depending on
2394 the number of cptrs to user gives to compare. */
2395 if (sym && sym->attr.is_iso_c == 1)
2397 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2401 /* Get the symtree for the new symbol (resolved func).
2402 the old one will be freed later, when it's no longer used. */
2403 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2406 /* Resume assumed_size checking. */
2407 need_full_assumed_size--;
2409 /* If the procedure is external, check for usage. */
2410 if (sym && is_external_proc (sym))
2411 resolve_global_procedure (sym, &expr->where,
2412 &expr->value.function.actual, 0);
2414 if (sym && sym->ts.type == BT_CHARACTER
2416 && sym->ts.cl->length == NULL
2418 && expr->value.function.esym == NULL
2419 && !sym->attr.contained)
2421 /* Internal procedures are taken care of in resolve_contained_fntype. */
2422 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2423 "be used at %L since it is not a dummy argument",
2424 sym->name, &expr->where);
2428 /* See if function is already resolved. */
2430 if (expr->value.function.name != NULL)
2432 if (expr->ts.type == BT_UNKNOWN)
2438 /* Apply the rules of section 14.1.2. */
2440 switch (procedure_kind (sym))
2443 t = resolve_generic_f (expr);
2446 case PTYPE_SPECIFIC:
2447 t = resolve_specific_f (expr);
2451 t = resolve_unknown_f (expr);
2455 gfc_internal_error ("resolve_function(): bad function type");
2459 /* If the expression is still a function (it might have simplified),
2460 then we check to see if we are calling an elemental function. */
2462 if (expr->expr_type != EXPR_FUNCTION)
2465 temp = need_full_assumed_size;
2466 need_full_assumed_size = 0;
2468 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2471 if (omp_workshare_flag
2472 && expr->value.function.esym
2473 && ! gfc_elemental (expr->value.function.esym))
2475 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2476 "in WORKSHARE construct", expr->value.function.esym->name,
2481 #define GENERIC_ID expr->value.function.isym->id
2482 else if (expr->value.function.actual != NULL
2483 && expr->value.function.isym != NULL
2484 && GENERIC_ID != GFC_ISYM_LBOUND
2485 && GENERIC_ID != GFC_ISYM_LEN
2486 && GENERIC_ID != GFC_ISYM_LOC
2487 && GENERIC_ID != GFC_ISYM_PRESENT)
2489 /* Array intrinsics must also have the last upper bound of an
2490 assumed size array argument. UBOUND and SIZE have to be
2491 excluded from the check if the second argument is anything
2494 for (arg = expr->value.function.actual; arg; arg = arg->next)
2496 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2497 && arg->next != NULL && arg->next->expr)
2499 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2502 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2505 if ((int)mpz_get_si (arg->next->expr->value.integer)
2510 if (arg->expr != NULL
2511 && arg->expr->rank > 0
2512 && resolve_assumed_size_actual (arg->expr))
2518 need_full_assumed_size = temp;
2521 if (!pure_function (expr, &name) && name)
2525 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2526 "FORALL %s", name, &expr->where,
2527 forall_flag == 2 ? "mask" : "block");
2530 else if (gfc_pure (NULL))
2532 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2533 "procedure within a PURE procedure", name, &expr->where);
2538 /* Functions without the RECURSIVE attribution are not allowed to
2539 * call themselves. */
2540 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2543 esym = expr->value.function.esym;
2545 if (is_illegal_recursion (esym, gfc_current_ns))
2547 if (esym->attr.entry && esym->ns->entries)
2548 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2549 " function '%s' is not RECURSIVE",
2550 esym->name, &expr->where, esym->ns->entries->sym->name);
2552 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2553 " is not RECURSIVE", esym->name, &expr->where);
2559 /* Character lengths of use associated functions may contains references to
2560 symbols not referenced from the current program unit otherwise. Make sure
2561 those symbols are marked as referenced. */
2563 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2564 && expr->value.function.esym->attr.use_assoc)
2566 gfc_expr_set_symbols_referenced (expr->ts.cl->length);
2570 && !((expr->value.function.esym
2571 && expr->value.function.esym->attr.elemental)
2573 (expr->value.function.isym
2574 && expr->value.function.isym->elemental)))
2575 find_noncopying_intrinsics (expr->value.function.esym,
2576 expr->value.function.actual);
2578 /* Make sure that the expression has a typespec that works. */
2579 if (expr->ts.type == BT_UNKNOWN)
2581 if (expr->symtree->n.sym->result
2582 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2583 && !expr->symtree->n.sym->result->attr.proc_pointer)
2584 expr->ts = expr->symtree->n.sym->result->ts;
2591 /************* Subroutine resolution *************/
2594 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2600 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2601 sym->name, &c->loc);
2602 else if (gfc_pure (NULL))
2603 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2609 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2613 if (sym->attr.generic)
2615 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2618 c->resolved_sym = s;
2619 pure_subroutine (c, s);
2623 /* TODO: Need to search for elemental references in generic interface. */
2626 if (sym->attr.intrinsic)
2627 return gfc_intrinsic_sub_interface (c, 0);
2634 resolve_generic_s (gfc_code *c)
2639 sym = c->symtree->n.sym;
2643 m = resolve_generic_s0 (c, sym);
2646 else if (m == MATCH_ERROR)
2650 if (sym->ns->parent == NULL)
2652 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2656 if (!generic_sym (sym))
2660 /* Last ditch attempt. See if the reference is to an intrinsic
2661 that possesses a matching interface. 14.1.2.4 */
2662 sym = c->symtree->n.sym;
2664 if (!gfc_is_intrinsic (sym, 1, c->loc))
2666 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2667 sym->name, &c->loc);
2671 m = gfc_intrinsic_sub_interface (c, 0);
2675 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2676 "intrinsic subroutine interface", sym->name, &c->loc);
2682 /* Set the name and binding label of the subroutine symbol in the call
2683 expression represented by 'c' to include the type and kind of the
2684 second parameter. This function is for resolving the appropriate
2685 version of c_f_pointer() and c_f_procpointer(). For example, a
2686 call to c_f_pointer() for a default integer pointer could have a
2687 name of c_f_pointer_i4. If no second arg exists, which is an error
2688 for these two functions, it defaults to the generic symbol's name
2689 and binding label. */
2692 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2693 char *name, char *binding_label)
2695 gfc_expr *arg = NULL;
2699 /* The second arg of c_f_pointer and c_f_procpointer determines
2700 the type and kind for the procedure name. */
2701 arg = c->ext.actual->next->expr;
2705 /* Set up the name to have the given symbol's name,
2706 plus the type and kind. */
2707 /* a derived type is marked with the type letter 'u' */
2708 if (arg->ts.type == BT_DERIVED)
2711 kind = 0; /* set the kind as 0 for now */
2715 type = gfc_type_letter (arg->ts.type);
2716 kind = arg->ts.kind;
2719 if (arg->ts.type == BT_CHARACTER)
2720 /* Kind info for character strings not needed. */
2723 sprintf (name, "%s_%c%d", sym->name, type, kind);
2724 /* Set up the binding label as the given symbol's label plus
2725 the type and kind. */
2726 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2730 /* If the second arg is missing, set the name and label as
2731 was, cause it should at least be found, and the missing
2732 arg error will be caught by compare_parameters(). */
2733 sprintf (name, "%s", sym->name);
2734 sprintf (binding_label, "%s", sym->binding_label);
2741 /* Resolve a generic version of the iso_c_binding procedure given
2742 (sym) to the specific one based on the type and kind of the
2743 argument(s). Currently, this function resolves c_f_pointer() and
2744 c_f_procpointer based on the type and kind of the second argument
2745 (FPTR). Other iso_c_binding procedures aren't specially handled.
2746 Upon successfully exiting, c->resolved_sym will hold the resolved
2747 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2751 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2753 gfc_symbol *new_sym;
2754 /* this is fine, since we know the names won't use the max */
2755 char name[GFC_MAX_SYMBOL_LEN + 1];
2756 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2757 /* default to success; will override if find error */
2758 match m = MATCH_YES;
2760 /* Make sure the actual arguments are in the necessary order (based on the
2761 formal args) before resolving. */
2762 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2764 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2765 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2767 set_name_and_label (c, sym, name, binding_label);
2769 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2771 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2773 /* Make sure we got a third arg if the second arg has non-zero
2774 rank. We must also check that the type and rank are
2775 correct since we short-circuit this check in
2776 gfc_procedure_use() (called above to sort actual args). */
2777 if (c->ext.actual->next->expr->rank != 0)
2779 if(c->ext.actual->next->next == NULL
2780 || c->ext.actual->next->next->expr == NULL)
2783 gfc_error ("Missing SHAPE parameter for call to %s "
2784 "at %L", sym->name, &(c->loc));
2786 else if (c->ext.actual->next->next->expr->ts.type
2788 || c->ext.actual->next->next->expr->rank != 1)
2791 gfc_error ("SHAPE parameter for call to %s at %L must "
2792 "be a rank 1 INTEGER array", sym->name,
2799 if (m != MATCH_ERROR)
2801 /* the 1 means to add the optional arg to formal list */
2802 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2804 /* for error reporting, say it's declared where the original was */
2805 new_sym->declared_at = sym->declared_at;
2810 /* no differences for c_loc or c_funloc */
2814 /* set the resolved symbol */
2815 if (m != MATCH_ERROR)
2816 c->resolved_sym = new_sym;
2818 c->resolved_sym = sym;
2824 /* Resolve a subroutine call known to be specific. */
2827 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2831 if(sym->attr.is_iso_c)
2833 m = gfc_iso_c_sub_interface (c,sym);
2837 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2839 if (sym->attr.dummy)
2841 sym->attr.proc = PROC_DUMMY;
2845 sym->attr.proc = PROC_EXTERNAL;
2849 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2852 if (sym->attr.intrinsic)
2854 m = gfc_intrinsic_sub_interface (c, 1);
2858 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2859 "with an intrinsic", sym->name, &c->loc);
2867 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2869 c->resolved_sym = sym;
2870 pure_subroutine (c, sym);
2877 resolve_specific_s (gfc_code *c)
2882 sym = c->symtree->n.sym;
2886 m = resolve_specific_s0 (c, sym);
2889 if (m == MATCH_ERROR)
2892 if (sym->ns->parent == NULL)
2895 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2901 sym = c->symtree->n.sym;
2902 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
2903 sym->name, &c->loc);
2909 /* Resolve a subroutine call not known to be generic nor specific. */
2912 resolve_unknown_s (gfc_code *c)
2916 sym = c->symtree->n.sym;
2918 if (sym->attr.dummy)
2920 sym->attr.proc = PROC_DUMMY;
2924 /* See if we have an intrinsic function reference. */
2926 if (gfc_is_intrinsic (sym, 1, c->loc))
2928 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
2933 /* The reference is to an external name. */
2936 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2938 c->resolved_sym = sym;
2940 pure_subroutine (c, sym);
2946 /* Resolve a subroutine call. Although it was tempting to use the same code
2947 for functions, subroutines and functions are stored differently and this
2948 makes things awkward. */
2951 resolve_call (gfc_code *c)
2954 procedure_type ptype = PROC_INTRINSIC;
2955 gfc_symbol *csym, *sym;
2956 bool no_formal_args;
2958 csym = c->symtree ? c->symtree->n.sym : NULL;
2960 if (csym && csym->ts.type != BT_UNKNOWN)
2962 gfc_error ("'%s' at %L has a type, which is not consistent with "
2963 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
2967 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
2970 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
2971 sym = st ? st->n.sym : NULL;
2972 if (sym && csym != sym
2973 && sym->ns == gfc_current_ns
2974 && sym->attr.flavor == FL_PROCEDURE
2975 && sym->attr.contained)
2978 if (csym->attr.generic)
2979 c->symtree->n.sym = sym;
2982 csym = c->symtree->n.sym;
2986 /* Subroutines without the RECURSIVE attribution are not allowed to
2987 * call themselves. */
2988 if (csym && is_illegal_recursion (csym, gfc_current_ns))
2990 if (csym->attr.entry && csym->ns->entries)
2991 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2992 " subroutine '%s' is not RECURSIVE",
2993 csym->name, &c->loc, csym->ns->entries->sym->name);
2995 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
2996 " is not RECURSIVE", csym->name, &c->loc);
3001 /* Switch off assumed size checking and do this again for certain kinds
3002 of procedure, once the procedure itself is resolved. */
3003 need_full_assumed_size++;
3006 ptype = csym->attr.proc;
3008 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3009 if (resolve_actual_arglist (c->ext.actual, ptype,
3010 no_formal_args) == FAILURE)
3013 /* Resume assumed_size checking. */
3014 need_full_assumed_size--;
3016 /* If external, check for usage. */
3017 if (csym && is_external_proc (csym))
3018 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3021 if (c->resolved_sym == NULL)
3023 c->resolved_isym = NULL;
3024 switch (procedure_kind (csym))
3027 t = resolve_generic_s (c);
3030 case PTYPE_SPECIFIC:
3031 t = resolve_specific_s (c);
3035 t = resolve_unknown_s (c);
3039 gfc_internal_error ("resolve_subroutine(): bad function type");
3043 /* Some checks of elemental subroutine actual arguments. */
3044 if (resolve_elemental_actual (NULL, c) == FAILURE)
3047 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3048 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3053 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3054 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3055 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3056 if their shapes do not match. If either op1->shape or op2->shape is
3057 NULL, return SUCCESS. */
3060 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3067 if (op1->shape != NULL && op2->shape != NULL)
3069 for (i = 0; i < op1->rank; i++)
3071 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3073 gfc_error ("Shapes for operands at %L and %L are not conformable",
3074 &op1->where, &op2->where);
3085 /* Resolve an operator expression node. This can involve replacing the
3086 operation with a user defined function call. */
3089 resolve_operator (gfc_expr *e)
3091 gfc_expr *op1, *op2;
3093 bool dual_locus_error;
3096 /* Resolve all subnodes-- give them types. */
3098 switch (e->value.op.op)
3101 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3104 /* Fall through... */
3107 case INTRINSIC_UPLUS:
3108 case INTRINSIC_UMINUS:
3109 case INTRINSIC_PARENTHESES:
3110 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3115 /* Typecheck the new node. */
3117 op1 = e->value.op.op1;
3118 op2 = e->value.op.op2;
3119 dual_locus_error = false;
3121 if ((op1 && op1->expr_type == EXPR_NULL)
3122 || (op2 && op2->expr_type == EXPR_NULL))
3124 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3128 switch (e->value.op.op)
3130 case INTRINSIC_UPLUS:
3131 case INTRINSIC_UMINUS:
3132 if (op1->ts.type == BT_INTEGER
3133 || op1->ts.type == BT_REAL
3134 || op1->ts.type == BT_COMPLEX)
3140 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3141 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3144 case INTRINSIC_PLUS:
3145 case INTRINSIC_MINUS:
3146 case INTRINSIC_TIMES:
3147 case INTRINSIC_DIVIDE:
3148 case INTRINSIC_POWER:
3149 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3151 gfc_type_convert_binary (e);
3156 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3157 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3158 gfc_typename (&op2->ts));
3161 case INTRINSIC_CONCAT:
3162 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3163 && op1->ts.kind == op2->ts.kind)
3165 e->ts.type = BT_CHARACTER;
3166 e->ts.kind = op1->ts.kind;
3171 _("Operands of string concatenation operator at %%L are %s/%s"),
3172 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3178 case INTRINSIC_NEQV:
3179 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3181 e->ts.type = BT_LOGICAL;
3182 e->ts.kind = gfc_kind_max (op1, op2);
3183 if (op1->ts.kind < e->ts.kind)
3184 gfc_convert_type (op1, &e->ts, 2);
3185 else if (op2->ts.kind < e->ts.kind)
3186 gfc_convert_type (op2, &e->ts, 2);
3190 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3191 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3192 gfc_typename (&op2->ts));
3197 if (op1->ts.type == BT_LOGICAL)
3199 e->ts.type = BT_LOGICAL;
3200 e->ts.kind = op1->ts.kind;
3204 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3205 gfc_typename (&op1->ts));
3209 case INTRINSIC_GT_OS:
3211 case INTRINSIC_GE_OS:
3213 case INTRINSIC_LT_OS:
3215 case INTRINSIC_LE_OS:
3216 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3218 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3222 /* Fall through... */
3225 case INTRINSIC_EQ_OS:
3227 case INTRINSIC_NE_OS:
3228 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3229 && op1->ts.kind == op2->ts.kind)
3231 e->ts.type = BT_LOGICAL;
3232 e->ts.kind = gfc_default_logical_kind;
3236 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3238 gfc_type_convert_binary (e);
3240 e->ts.type = BT_LOGICAL;
3241 e->ts.kind = gfc_default_logical_kind;
3245 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3247 _("Logicals at %%L must be compared with %s instead of %s"),
3248 (e->value.op.op == INTRINSIC_EQ
3249 || e->value.op.op == INTRINSIC_EQ_OS)
3250 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3253 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3254 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3255 gfc_typename (&op2->ts));
3259 case INTRINSIC_USER:
3260 if (e->value.op.uop->op == NULL)
3261 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3262 else if (op2 == NULL)
3263 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3264 e->value.op.uop->name, gfc_typename (&op1->ts));
3266 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3267 e->value.op.uop->name, gfc_typename (&op1->ts),
3268 gfc_typename (&op2->ts));
3272 case INTRINSIC_PARENTHESES:
3274 if (e->ts.type == BT_CHARACTER)
3275 e->ts.cl = op1->ts.cl;
3279 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3282 /* Deal with arrayness of an operand through an operator. */
3286 switch (e->value.op.op)
3288 case INTRINSIC_PLUS:
3289 case INTRINSIC_MINUS:
3290 case INTRINSIC_TIMES:
3291 case INTRINSIC_DIVIDE:
3292 case INTRINSIC_POWER:
3293 case INTRINSIC_CONCAT:
3297 case INTRINSIC_NEQV:
3299 case INTRINSIC_EQ_OS:
3301 case INTRINSIC_NE_OS:
3303 case INTRINSIC_GT_OS:
3305 case INTRINSIC_GE_OS:
3307 case INTRINSIC_LT_OS:
3309 case INTRINSIC_LE_OS:
3311 if (op1->rank == 0 && op2->rank == 0)
3314 if (op1->rank == 0 && op2->rank != 0)
3316 e->rank = op2->rank;
3318 if (e->shape == NULL)
3319 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3322 if (op1->rank != 0 && op2->rank == 0)
3324 e->rank = op1->rank;
3326 if (e->shape == NULL)
3327 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3330 if (op1->rank != 0 && op2->rank != 0)
3332 if (op1->rank == op2->rank)
3334 e->rank = op1->rank;
3335 if (e->shape == NULL)
3337 t = compare_shapes(op1, op2);
3341 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3346 /* Allow higher level expressions to work. */
3349 /* Try user-defined operators, and otherwise throw an error. */
3350 dual_locus_error = true;
3352 _("Inconsistent ranks for operator at %%L and %%L"));
3359 case INTRINSIC_PARENTHESES:
3361 case INTRINSIC_UPLUS:
3362 case INTRINSIC_UMINUS:
3363 /* Simply copy arrayness attribute */
3364 e->rank = op1->rank;
3366 if (e->shape == NULL)
3367 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3375 /* Attempt to simplify the expression. */
3378 t = gfc_simplify_expr (e, 0);
3379 /* Some calls do not succeed in simplification and return FAILURE
3380 even though there is no error; e.g. variable references to
3381 PARAMETER arrays. */
3382 if (!gfc_is_constant_expr (e))
3389 if (gfc_extend_expr (e) == SUCCESS)
3392 if (dual_locus_error)
3393 gfc_error (msg, &op1->where, &op2->where);
3395 gfc_error (msg, &e->where);
3401 /************** Array resolution subroutines **************/
3404 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3407 /* Compare two integer expressions. */
3410 compare_bound (gfc_expr *a, gfc_expr *b)
3414 if (a == NULL || a->expr_type != EXPR_CONSTANT
3415 || b == NULL || b->expr_type != EXPR_CONSTANT)
3418 /* If either of the types isn't INTEGER, we must have
3419 raised an error earlier. */
3421 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3424 i = mpz_cmp (a->value.integer, b->value.integer);
3434 /* Compare an integer expression with an integer. */
3437 compare_bound_int (gfc_expr *a, int b)
3441 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3444 if (a->ts.type != BT_INTEGER)
3445 gfc_internal_error ("compare_bound_int(): Bad expression");
3447 i = mpz_cmp_si (a->value.integer, b);
3457 /* Compare an integer expression with a mpz_t. */
3460 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3464 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3467 if (a->ts.type != BT_INTEGER)
3468 gfc_internal_error ("compare_bound_int(): Bad expression");
3470 i = mpz_cmp (a->value.integer, b);
3480 /* Compute the last value of a sequence given by a triplet.
3481 Return 0 if it wasn't able to compute the last value, or if the
3482 sequence if empty, and 1 otherwise. */
3485 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3486 gfc_expr *stride, mpz_t last)
3490 if (start == NULL || start->expr_type != EXPR_CONSTANT
3491 || end == NULL || end->expr_type != EXPR_CONSTANT
3492 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3495 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3496 || (stride != NULL && stride->ts.type != BT_INTEGER))
3499 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3501 if (compare_bound (start, end) == CMP_GT)
3503 mpz_set (last, end->value.integer);
3507 if (compare_bound_int (stride, 0) == CMP_GT)
3509 /* Stride is positive */
3510 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3515 /* Stride is negative */
3516 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3521 mpz_sub (rem, end->value.integer, start->value.integer);
3522 mpz_tdiv_r (rem, rem, stride->value.integer);
3523 mpz_sub (last, end->value.integer, rem);
3530 /* Compare a single dimension of an array reference to the array
3534 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3538 /* Given start, end and stride values, calculate the minimum and
3539 maximum referenced indexes. */
3541 switch (ar->dimen_type[i])
3547 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3549 gfc_warning ("Array reference at %L is out of bounds "
3550 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3551 mpz_get_si (ar->start[i]->value.integer),
3552 mpz_get_si (as->lower[i]->value.integer), i+1);
3555 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3557 gfc_warning ("Array reference at %L is out of bounds "
3558 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3559 mpz_get_si (ar->start[i]->value.integer),
3560 mpz_get_si (as->upper[i]->value.integer), i+1);
3568 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3569 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3571 comparison comp_start_end = compare_bound (AR_START, AR_END);
3573 /* Check for zero stride, which is not allowed. */
3574 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3576 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3580 /* if start == len || (stride > 0 && start < len)
3581 || (stride < 0 && start > len),
3582 then the array section contains at least one element. In this
3583 case, there is an out-of-bounds access if
3584 (start < lower || start > upper). */
3585 if (compare_bound (AR_START, AR_END) == CMP_EQ
3586 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3587 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3588 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3589 && comp_start_end == CMP_GT))
3591 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3593 gfc_warning ("Lower array reference at %L is out of bounds "
3594 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3595 mpz_get_si (AR_START->value.integer),
3596 mpz_get_si (as->lower[i]->value.integer), i+1);
3599 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3601 gfc_warning ("Lower array reference at %L is out of bounds "
3602 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3603 mpz_get_si (AR_START->value.integer),
3604 mpz_get_si (as->upper[i]->value.integer), i+1);
3609 /* If we can compute the highest index of the array section,
3610 then it also has to be between lower and upper. */
3611 mpz_init (last_value);
3612 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3615 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3617 gfc_warning ("Upper array reference at %L is out of bounds "
3618 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3619 mpz_get_si (last_value),
3620 mpz_get_si (as->lower[i]->value.integer), i+1);
3621 mpz_clear (last_value);
3624 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3626 gfc_warning ("Upper array reference at %L is out of bounds "
3627 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3628 mpz_get_si (last_value),
3629 mpz_get_si (as->upper[i]->value.integer), i+1);
3630 mpz_clear (last_value);
3634 mpz_clear (last_value);
3642 gfc_internal_error ("check_dimension(): Bad array reference");
3649 /* Compare an array reference with an array specification. */
3652 compare_spec_to_ref (gfc_array_ref *ar)
3659 /* TODO: Full array sections are only allowed as actual parameters. */
3660 if (as->type == AS_ASSUMED_SIZE
3661 && (/*ar->type == AR_FULL
3662 ||*/ (ar->type == AR_SECTION
3663 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3665 gfc_error ("Rightmost upper bound of assumed size array section "
3666 "not specified at %L", &ar->where);
3670 if (ar->type == AR_FULL)
3673 if (as->rank != ar->dimen)
3675 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3676 &ar->where, ar->dimen, as->rank);
3680 for (i = 0; i < as->rank; i++)
3681 if (check_dimension (i, ar, as) == FAILURE)
3688 /* Resolve one part of an array index. */
3691 gfc_resolve_index (gfc_expr *index, int check_scalar)
3698 if (gfc_resolve_expr (index) == FAILURE)
3701 if (check_scalar && index->rank != 0)
3703 gfc_error ("Array index at %L must be scalar", &index->where);
3707 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3709 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3710 &index->where, gfc_basic_typename (index->ts.type));
3714 if (index->ts.type == BT_REAL)
3715 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3716 &index->where) == FAILURE)
3719 if (index->ts.kind != gfc_index_integer_kind
3720 || index->ts.type != BT_INTEGER)
3723 ts.type = BT_INTEGER;
3724 ts.kind = gfc_index_integer_kind;
3726 gfc_convert_type_warn (index, &ts, 2, 0);
3732 /* Resolve a dim argument to an intrinsic function. */
3735 gfc_resolve_dim_arg (gfc_expr *dim)
3740 if (gfc_resolve_expr (dim) == FAILURE)
3745 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3750 if (dim->ts.type != BT_INTEGER)
3752 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3756 if (dim->ts.kind != gfc_index_integer_kind)
3760 ts.type = BT_INTEGER;
3761 ts.kind = gfc_index_integer_kind;
3763 gfc_convert_type_warn (dim, &ts, 2, 0);
3769 /* Given an expression that contains array references, update those array
3770 references to point to the right array specifications. While this is
3771 filled in during matching, this information is difficult to save and load
3772 in a module, so we take care of it here.
3774 The idea here is that the original array reference comes from the
3775 base symbol. We traverse the list of reference structures, setting
3776 the stored reference to references. Component references can
3777 provide an additional array specification. */
3780 find_array_spec (gfc_expr *e)
3784 gfc_symbol *derived;
3787 as = e->symtree->n.sym->as;
3790 for (ref = e->ref; ref; ref = ref->next)
3795 gfc_internal_error ("find_array_spec(): Missing spec");
3802 if (derived == NULL)
3803 derived = e->symtree->n.sym->ts.derived;
3805 c = derived->components;
3807 for (; c; c = c->next)
3808 if (c == ref->u.c.component)
3810 /* Track the sequence of component references. */
3811 if (c->ts.type == BT_DERIVED)
3812 derived = c->ts.derived;
3817 gfc_internal_error ("find_array_spec(): Component not found");
3819 if (c->attr.dimension)
3822 gfc_internal_error ("find_array_spec(): unused as(1)");
3833 gfc_internal_error ("find_array_spec(): unused as(2)");
3837 /* Resolve an array reference. */
3840 resolve_array_ref (gfc_array_ref *ar)
3842 int i, check_scalar;
3845 for (i = 0; i < ar->dimen; i++)
3847 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3849 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3851 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3853 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3858 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3862 ar->dimen_type[i] = DIMEN_ELEMENT;
3866 ar->dimen_type[i] = DIMEN_VECTOR;
3867 if (e->expr_type == EXPR_VARIABLE
3868 && e->symtree->n.sym->ts.type == BT_DERIVED)
3869 ar->start[i] = gfc_get_parentheses (e);
3873 gfc_error ("Array index at %L is an array of rank %d",
3874 &ar->c_where[i], e->rank);
3879 /* If the reference type is unknown, figure out what kind it is. */
3881 if (ar->type == AR_UNKNOWN)
3883 ar->type = AR_ELEMENT;
3884 for (i = 0; i < ar->dimen; i++)
3885 if (ar->dimen_type[i] == DIMEN_RANGE
3886 || ar->dimen_type[i] == DIMEN_VECTOR)
3888 ar->type = AR_SECTION;
3893 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
3901 resolve_substring (gfc_ref *ref)
3903 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
3905 if (ref->u.ss.start != NULL)
3907 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
3910 if (ref->u.ss.start->ts.type != BT_INTEGER)
3912 gfc_error ("Substring start index at %L must be of type INTEGER",
3913 &ref->u.ss.start->where);
3917 if (ref->u.ss.start->rank != 0)
3919 gfc_error ("Substring start index at %L must be scalar",
3920 &ref->u.ss.start->where);
3924 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
3925 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3926 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3928 gfc_error ("Substring start index at %L is less than one",
3929 &ref->u.ss.start->where);
3934 if (ref->u.ss.end != NULL)
3936 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
3939 if (ref->u.ss.end->ts.type != BT_INTEGER)
3941 gfc_error ("Substring end index at %L must be of type INTEGER",
3942 &ref->u.ss.end->where);
3946 if (ref->u.ss.end->rank != 0)
3948 gfc_error ("Substring end index at %L must be scalar",
3949 &ref->u.ss.end->where);
3953 if (ref->u.ss.length != NULL
3954 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
3955 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3956 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3958 gfc_error ("Substring end index at %L exceeds the string length",
3959 &ref->u.ss.start->where);
3963 if (compare_bound_mpz_t (ref->u.ss.end,
3964 gfc_integer_kinds[k].huge) == CMP_GT
3965 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3966 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3968 gfc_error ("Substring end index at %L is too large",
3969 &ref->u.ss.end->where);
3978 /* This function supplies missing substring charlens. */
3981 gfc_resolve_substring_charlen (gfc_expr *e)
3984 gfc_expr *start, *end;
3986 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
3987 if (char_ref->type == REF_SUBSTRING)
3993 gcc_assert (char_ref->next == NULL);
3997 if (e->ts.cl->length)
3998 gfc_free_expr (e->ts.cl->length);
3999 else if (e->expr_type == EXPR_VARIABLE
4000 && e->symtree->n.sym->attr.dummy)
4004 e->ts.type = BT_CHARACTER;
4005 e->ts.kind = gfc_default_character_kind;
4009 e->ts.cl = gfc_get_charlen ();
4010 e->ts.cl->next = gfc_current_ns->cl_list;
4011 gfc_current_ns->cl_list = e->ts.cl;
4014 if (char_ref->u.ss.start)
4015 start = gfc_copy_expr (char_ref->u.ss.start);
4017 start = gfc_int_expr (1);
4019 if (char_ref->u.ss.end)
4020 end = gfc_copy_expr (char_ref->u.ss.end);
4021 else if (e->expr_type == EXPR_VARIABLE)
4022 end = gfc_copy_expr (e->symtree->n.sym->ts.cl->length);
4029 /* Length = (end - start +1). */
4030 e->ts.cl->length = gfc_subtract (end, start);
4031 e->ts.cl->length = gfc_add (e->ts.cl->length, gfc_int_expr (1));
4033 e->ts.cl->length->ts.type = BT_INTEGER;
4034 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4036 /* Make sure that the length is simplified. */
4037 gfc_simplify_expr (e->ts.cl->length, 1);
4038 gfc_resolve_expr (e->ts.cl->length);
4042 /* Resolve subtype references. */
4045 resolve_ref (gfc_expr *expr)
4047 int current_part_dimension, n_components, seen_part_dimension;
4050 for (ref = expr->ref; ref; ref = ref->next)
4051 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4053 find_array_spec (expr);
4057 for (ref = expr->ref; ref; ref = ref->next)
4061 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4069 resolve_substring (ref);
4073 /* Check constraints on part references. */
4075 current_part_dimension = 0;
4076 seen_part_dimension = 0;
4079 for (ref = expr->ref; ref; ref = ref->next)
4084 switch (ref->u.ar.type)
4088 current_part_dimension = 1;
4092 current_part_dimension = 0;
4096 gfc_internal_error ("resolve_ref(): Bad array reference");
4102 if (current_part_dimension || seen_part_dimension)
4104 if (ref->u.c.component->attr.pointer)
4106 gfc_error ("Component to the right of a part reference "
4107 "with nonzero rank must not have the POINTER "
4108 "attribute at %L", &expr->where);
4111 else if (ref->u.c.component->attr.allocatable)
4113 gfc_error ("Component to the right of a part reference "
4114 "with nonzero rank must not have the ALLOCATABLE "
4115 "attribute at %L", &expr->where);
4127 if (((ref->type == REF_COMPONENT && n_components > 1)
4128 || ref->next == NULL)
4129 && current_part_dimension
4130 && seen_part_dimension)
4132 gfc_error ("Two or more part references with nonzero rank must "
4133 "not be specified at %L", &expr->where);
4137 if (ref->type == REF_COMPONENT)
4139 if (current_part_dimension)
4140 seen_part_dimension = 1;
4142 /* reset to make sure */
4143 current_part_dimension = 0;
4151 /* Given an expression, determine its shape. This is easier than it sounds.
4152 Leaves the shape array NULL if it is not possible to determine the shape. */
4155 expression_shape (gfc_expr *e)
4157 mpz_t array[GFC_MAX_DIMENSIONS];
4160 if (e->rank == 0 || e->shape != NULL)
4163 for (i = 0; i < e->rank; i++)
4164 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4167 e->shape = gfc_get_shape (e->rank);
4169 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4174 for (i--; i >= 0; i--)
4175 mpz_clear (array[i]);
4179 /* Given a variable expression node, compute the rank of the expression by
4180 examining the base symbol and any reference structures it may have. */
4183 expression_rank (gfc_expr *e)
4188 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4189 could lead to serious confusion... */
4190 gcc_assert (e->expr_type != EXPR_COMPCALL);
4194 if (e->expr_type == EXPR_ARRAY)
4196 /* Constructors can have a rank different from one via RESHAPE(). */
4198 if (e->symtree == NULL)
4204 e->rank = (e->symtree->n.sym->as == NULL)
4205 ? 0 : e->symtree->n.sym->as->rank;
4211 for (ref = e->ref; ref; ref = ref->next)
4213 if (ref->type != REF_ARRAY)
4216 if (ref->u.ar.type == AR_FULL)
4218 rank = ref->u.ar.as->rank;
4222 if (ref->u.ar.type == AR_SECTION)
4224 /* Figure out the rank of the section. */
4226 gfc_internal_error ("expression_rank(): Two array specs");
4228 for (i = 0; i < ref->u.ar.dimen; i++)
4229 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4230 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4240 expression_shape (e);
4244 /* Resolve a variable expression. */
4247 resolve_variable (gfc_expr *e)
4254 if (e->symtree == NULL)
4257 if (e->ref && resolve_ref (e) == FAILURE)
4260 sym = e->symtree->n.sym;
4261 if (sym->attr.flavor == FL_PROCEDURE
4262 && (!sym->attr.function
4263 || (sym->attr.function && sym->result
4264 && sym->result->attr.proc_pointer
4265 && !sym->result->attr.function)))
4267 e->ts.type = BT_PROCEDURE;
4268 goto resolve_procedure;
4271 if (sym->ts.type != BT_UNKNOWN)
4272 gfc_variable_attr (e, &e->ts);
4275 /* Must be a simple variable reference. */
4276 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4281 if (check_assumed_size_reference (sym, e))
4284 /* Deal with forward references to entries during resolve_code, to
4285 satisfy, at least partially, 12.5.2.5. */
4286 if (gfc_current_ns->entries
4287 && current_entry_id == sym->entry_id
4290 && cs_base->current->op != EXEC_ENTRY)
4292 gfc_entry_list *entry;
4293 gfc_formal_arglist *formal;
4297 /* If the symbol is a dummy... */
4298 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4300 entry = gfc_current_ns->entries;
4303 /* ...test if the symbol is a parameter of previous entries. */
4304 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4305 for (formal = entry->sym->formal; formal; formal = formal->next)
4307 if (formal->sym && sym->name == formal->sym->name)
4311 /* If it has not been seen as a dummy, this is an error. */
4314 if (specification_expr)
4315 gfc_error ("Variable '%s', used in a specification expression"
4316 ", is referenced at %L before the ENTRY statement "
4317 "in which it is a parameter",
4318 sym->name, &cs_base->current->loc);
4320 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4321 "statement in which it is a parameter",
4322 sym->name, &cs_base->current->loc);
4327 /* Now do the same check on the specification expressions. */
4328 specification_expr = 1;
4329 if (sym->ts.type == BT_CHARACTER
4330 && gfc_resolve_expr (sym->ts.cl->length) == FAILURE)
4334 for (n = 0; n < sym->as->rank; n++)
4336 specification_expr = 1;
4337 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4339 specification_expr = 1;
4340 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4343 specification_expr = 0;
4346 /* Update the symbol's entry level. */
4347 sym->entry_id = current_entry_id + 1;
4351 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4358 /* Checks to see that the correct symbol has been host associated.
4359 The only situation where this arises is that in which a twice
4360 contained function is parsed after the host association is made.
4361 Therefore, on detecting this, change the symbol in the expression
4362 and convert the array reference into an actual arglist if the old
4363 symbol is a variable. */
4365 check_host_association (gfc_expr *e)
4367 gfc_symbol *sym, *old_sym;
4371 gfc_actual_arglist *arg, *tail = NULL;
4372 bool retval = e->expr_type == EXPR_FUNCTION;
4374 /* If the expression is the result of substitution in
4375 interface.c(gfc_extend_expr) because there is no way in
4376 which the host association can be wrong. */
4377 if (e->symtree == NULL
4378 || e->symtree->n.sym == NULL
4379 || e->user_operator)
4382 old_sym = e->symtree->n.sym;
4384 if (gfc_current_ns->parent
4385 && old_sym->ns != gfc_current_ns)
4387 /* Use the 'USE' name so that renamed module symbols are
4388 correctly handled. */
4389 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4391 if (sym && old_sym != sym
4392 && sym->ts.type == old_sym->ts.type
4393 && sym->attr.flavor == FL_PROCEDURE
4394 && sym->attr.contained)
4396 /* Clear the shape, since it might not be valid. */
4397 if (e->shape != NULL)
4399 for (n = 0; n < e->rank; n++)
4400 mpz_clear (e->shape[n]);
4402 gfc_free (e->shape);
4405 /* Give the symbol a symtree in the right place! */
4406 gfc_get_sym_tree (sym->name, gfc_current_ns, &st, false);
4409 if (old_sym->attr.flavor == FL_PROCEDURE)
4411 /* Original was function so point to the new symbol, since
4412 the actual argument list is already attached to the
4414 e->value.function.esym = NULL;
4419 /* Original was variable so convert array references into
4420 an actual arglist. This does not need any checking now
4421 since gfc_resolve_function will take care of it. */
4422 e->value.function.actual = NULL;
4423 e->expr_type = EXPR_FUNCTION;
4426 /* Ambiguity will not arise if the array reference is not
4427 the last reference. */
4428 for (ref = e->ref; ref; ref = ref->next)
4429 if (ref->type == REF_ARRAY && ref->next == NULL)
4432 gcc_assert (ref->type == REF_ARRAY);
4434 /* Grab the start expressions from the array ref and
4435 copy them into actual arguments. */
4436 for (n = 0; n < ref->u.ar.dimen; n++)
4438 arg = gfc_get_actual_arglist ();
4439 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4440 if (e->value.function.actual == NULL)
4441 tail = e->value.function.actual = arg;
4449 /* Dump the reference list and set the rank. */
4450 gfc_free_ref_list (e->ref);
4452 e->rank = sym->as ? sym->as->rank : 0;
4455 gfc_resolve_expr (e);
4459 /* This might have changed! */
4460 return e->expr_type == EXPR_FUNCTION;
4465 gfc_resolve_character_operator (gfc_expr *e)
4467 gfc_expr *op1 = e->value.op.op1;
4468 gfc_expr *op2 = e->value.op.op2;
4469 gfc_expr *e1 = NULL;
4470 gfc_expr *e2 = NULL;
4472 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4474 if (op1->ts.cl && op1->ts.cl->length)
4475 e1 = gfc_copy_expr (op1->ts.cl->length);
4476 else if (op1->expr_type == EXPR_CONSTANT)
4477 e1 = gfc_int_expr (op1->value.character.length);
4479 if (op2->ts.cl && op2->ts.cl->length)
4480 e2 = gfc_copy_expr (op2->ts.cl->length);
4481 else if (op2->expr_type == EXPR_CONSTANT)
4482 e2 = gfc_int_expr (op2->value.character.length);
4484 e->ts.cl = gfc_get_charlen ();
4485 e->ts.cl->next = gfc_current_ns->cl_list;
4486 gfc_current_ns->cl_list = e->ts.cl;
4491 e->ts.cl->length = gfc_add (e1, e2);
4492 e->ts.cl->length->ts.type = BT_INTEGER;
4493 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4494 gfc_simplify_expr (e->ts.cl->length, 0);
4495 gfc_resolve_expr (e->ts.cl->length);
4501 /* Ensure that an character expression has a charlen and, if possible, a
4502 length expression. */
4505 fixup_charlen (gfc_expr *e)
4507 /* The cases fall through so that changes in expression type and the need
4508 for multiple fixes are picked up. In all circumstances, a charlen should
4509 be available for the middle end to hang a backend_decl on. */
4510 switch (e->expr_type)
4513 gfc_resolve_character_operator (e);
4516 if (e->expr_type == EXPR_ARRAY)
4517 gfc_resolve_character_array_constructor (e);
4519 case EXPR_SUBSTRING:
4520 if (!e->ts.cl && e->ref)
4521 gfc_resolve_substring_charlen (e);
4526 e->ts.cl = gfc_get_charlen ();
4527 e->ts.cl->next = gfc_current_ns->cl_list;
4528 gfc_current_ns->cl_list = e->ts.cl;
4536 /* Update an actual argument to include the passed-object for type-bound
4537 procedures at the right position. */
4539 static gfc_actual_arglist*
4540 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos)
4542 gcc_assert (argpos > 0);
4546 gfc_actual_arglist* result;
4548 result = gfc_get_actual_arglist ();
4556 gcc_assert (argpos > 1);
4558 lst->next = update_arglist_pass (lst->next, po, argpos - 1);
4563 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4566 extract_compcall_passed_object (gfc_expr* e)
4570 gcc_assert (e->expr_type == EXPR_COMPCALL);
4572 po = gfc_get_expr ();
4573 po->expr_type = EXPR_VARIABLE;
4574 po->symtree = e->symtree;
4575 po->ref = gfc_copy_ref (e->ref);
4577 if (gfc_resolve_expr (po) == FAILURE)
4584 /* Update the arglist of an EXPR_COMPCALL expression to include the
4588 update_compcall_arglist (gfc_expr* e)
4591 gfc_typebound_proc* tbp;
4593 tbp = e->value.compcall.tbp;
4598 po = extract_compcall_passed_object (e);
4604 gfc_error ("Passed-object at %L must be scalar", &e->where);
4614 gcc_assert (tbp->pass_arg_num > 0);
4615 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4622 /* Check that the object a TBP is called on is valid, i.e. it must not be
4623 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4626 check_typebound_baseobject (gfc_expr* e)
4630 base = extract_compcall_passed_object (e);
4634 gcc_assert (base->ts.type == BT_DERIVED);
4635 if (base->ts.derived->attr.abstract)
4637 gfc_error ("Base object for type-bound procedure call at %L is of"
4638 " ABSTRACT type '%s'", &e->where, base->ts.derived->name);
4646 /* Resolve a call to a type-bound procedure, either function or subroutine,
4647 statically from the data in an EXPR_COMPCALL expression. The adapted
4648 arglist and the target-procedure symtree are returned. */
4651 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4652 gfc_actual_arglist** actual)
4654 gcc_assert (e->expr_type == EXPR_COMPCALL);
4655 gcc_assert (!e->value.compcall.tbp->is_generic);
4657 /* Update the actual arglist for PASS. */
4658 if (update_compcall_arglist (e) == FAILURE)
4661 *actual = e->value.compcall.actual;
4662 *target = e->value.compcall.tbp->u.specific;
4664 gfc_free_ref_list (e->ref);
4666 e->value.compcall.actual = NULL;
4672 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4673 which of the specific bindings (if any) matches the arglist and transform
4674 the expression into a call of that binding. */
4677 resolve_typebound_generic_call (gfc_expr* e)
4679 gfc_typebound_proc* genproc;
4680 const char* genname;
4682 gcc_assert (e->expr_type == EXPR_COMPCALL);
4683 genname = e->value.compcall.name;
4684 genproc = e->value.compcall.tbp;
4686 if (!genproc->is_generic)
4689 /* Try the bindings on this type and in the inheritance hierarchy. */
4690 for (; genproc; genproc = genproc->overridden)
4694 gcc_assert (genproc->is_generic);
4695 for (g = genproc->u.generic; g; g = g->next)
4698 gfc_actual_arglist* args;
4701 gcc_assert (g->specific);
4703 if (g->specific->error)
4706 target = g->specific->u.specific->n.sym;
4708 /* Get the right arglist by handling PASS/NOPASS. */
4709 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4710 if (!g->specific->nopass)
4713 po = extract_compcall_passed_object (e);
4717 gcc_assert (g->specific->pass_arg_num > 0);
4718 gcc_assert (!g->specific->error);
4719 args = update_arglist_pass (args, po, g->specific->pass_arg_num);
4721 resolve_actual_arglist (args, target->attr.proc,
4722 is_external_proc (target) && !target->formal);
4724 /* Check if this arglist matches the formal. */
4725 matches = gfc_arglist_matches_symbol (&args, target);
4727 /* Clean up and break out of the loop if we've found it. */
4728 gfc_free_actual_arglist (args);
4731 e->value.compcall.tbp = g->specific;
4737 /* Nothing matching found! */
4738 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4739 " '%s' at %L", genname, &e->where);
4747 /* Resolve a call to a type-bound subroutine. */
4750 resolve_typebound_call (gfc_code* c)
4752 gfc_actual_arglist* newactual;
4753 gfc_symtree* target;
4755 /* Check that's really a SUBROUTINE. */
4756 if (!c->expr1->value.compcall.tbp->subroutine)
4758 gfc_error ("'%s' at %L should be a SUBROUTINE",
4759 c->expr1->value.compcall.name, &c->loc);
4763 if (check_typebound_baseobject (c->expr1) == FAILURE)
4766 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
4769 /* Transform into an ordinary EXEC_CALL for now. */
4771 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
4774 c->ext.actual = newactual;
4775 c->symtree = target;
4778 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
4779 gfc_free_expr (c->expr1);
4782 return resolve_call (c);
4786 /* Resolve a component-call expression. */
4789 resolve_compcall (gfc_expr* e)
4791 gfc_actual_arglist* newactual;
4792 gfc_symtree* target;
4794 /* Check that's really a FUNCTION. */
4795 if (!e->value.compcall.tbp->function)
4797 gfc_error ("'%s' at %L should be a FUNCTION",
4798 e->value.compcall.name, &e->where);
4802 if (check_typebound_baseobject (e) == FAILURE)
4805 if (resolve_typebound_generic_call (e) == FAILURE)
4807 gcc_assert (!e->value.compcall.tbp->is_generic);
4809 /* Take the rank from the function's symbol. */
4810 if (e->value.compcall.tbp->u.specific->n.sym->as)
4811 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
4813 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
4814 arglist to the TBP's binding target. */
4816 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
4819 e->value.function.actual = newactual;
4820 e->value.function.name = e->value.compcall.name;
4821 e->value.function.esym = target->n.sym;
4822 e->value.function.isym = NULL;
4823 e->symtree = target;
4824 e->ts = target->n.sym->ts;
4825 e->expr_type = EXPR_FUNCTION;
4827 return gfc_resolve_expr (e);
4831 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
4834 resolve_ppc_call (gfc_code* c)
4836 gfc_component *comp;
4837 gcc_assert (is_proc_ptr_comp (c->expr1, &comp));
4839 c->resolved_sym = c->expr1->symtree->n.sym;
4840 c->expr1->expr_type = EXPR_VARIABLE;
4841 c->ext.actual = c->expr1->value.compcall.actual;
4843 if (!comp->attr.subroutine)
4844 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
4846 if (resolve_ref (c->expr1) == FAILURE)
4849 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
4850 comp->formal == NULL) == FAILURE)
4853 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
4859 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
4862 resolve_expr_ppc (gfc_expr* e)
4864 gfc_component *comp;
4865 gcc_assert (is_proc_ptr_comp (e, &comp));
4867 /* Convert to EXPR_FUNCTION. */
4868 e->expr_type = EXPR_FUNCTION;
4869 e->value.function.isym = NULL;
4870 e->value.function.actual = e->value.compcall.actual;
4872 if (comp->as != NULL)
4873 e->rank = comp->as->rank;
4875 if (!comp->attr.function)
4876 gfc_add_function (&comp->attr, comp->name, &e->where);
4878 if (resolve_ref (e) == FAILURE)
4881 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
4882 comp->formal == NULL) == FAILURE)
4885 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
4891 /* Resolve an expression. That is, make sure that types of operands agree
4892 with their operators, intrinsic operators are converted to function calls
4893 for overloaded types and unresolved function references are resolved. */
4896 gfc_resolve_expr (gfc_expr *e)
4903 switch (e->expr_type)
4906 t = resolve_operator (e);
4912 if (check_host_association (e))
4913 t = resolve_function (e);
4916 t = resolve_variable (e);
4918 expression_rank (e);
4921 if (e->ts.type == BT_CHARACTER && e->ts.cl == NULL && e->ref
4922 && e->ref->type != REF_SUBSTRING)
4923 gfc_resolve_substring_charlen (e);
4928 t = resolve_compcall (e);
4931 case EXPR_SUBSTRING:
4932 t = resolve_ref (e);
4941 t = resolve_expr_ppc (e);
4946 if (resolve_ref (e) == FAILURE)
4949 t = gfc_resolve_array_constructor (e);
4950 /* Also try to expand a constructor. */
4953 expression_rank (e);
4954 gfc_expand_constructor (e);
4957 /* This provides the opportunity for the length of constructors with
4958 character valued function elements to propagate the string length
4959 to the expression. */
4960 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
4961 t = gfc_resolve_character_array_constructor (e);
4965 case EXPR_STRUCTURE:
4966 t = resolve_ref (e);
4970 t = resolve_structure_cons (e);
4974 t = gfc_simplify_expr (e, 0);
4978 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
4981 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.cl)
4988 /* Resolve an expression from an iterator. They must be scalar and have
4989 INTEGER or (optionally) REAL type. */
4992 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
4993 const char *name_msgid)
4995 if (gfc_resolve_expr (expr) == FAILURE)
4998 if (expr->rank != 0)
5000 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5004 if (expr->ts.type != BT_INTEGER)
5006 if (expr->ts.type == BT_REAL)
5009 return gfc_notify_std (GFC_STD_F95_DEL,
5010 "Deleted feature: %s at %L must be integer",
5011 _(name_msgid), &expr->where);
5014 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5021 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5029 /* Resolve the expressions in an iterator structure. If REAL_OK is
5030 false allow only INTEGER type iterators, otherwise allow REAL types. */
5033 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5035 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5039 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5041 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5046 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5047 "Start expression in DO loop") == FAILURE)
5050 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5051 "End expression in DO loop") == FAILURE)
5054 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5055 "Step expression in DO loop") == FAILURE)
5058 if (iter->step->expr_type == EXPR_CONSTANT)
5060 if ((iter->step->ts.type == BT_INTEGER
5061 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5062 || (iter->step->ts.type == BT_REAL
5063 && mpfr_sgn (iter->step->value.real) == 0))
5065 gfc_error ("Step expression in DO loop at %L cannot be zero",
5066 &iter->step->where);
5071 /* Convert start, end, and step to the same type as var. */
5072 if (iter->start->ts.kind != iter->var->ts.kind
5073 || iter->start->ts.type != iter->var->ts.type)
5074 gfc_convert_type (iter->start, &iter->var->ts, 2);
5076 if (iter->end->ts.kind != iter->var->ts.kind
5077 || iter->end->ts.type != iter->var->ts.type)
5078 gfc_convert_type (iter->end, &iter->var->ts, 2);
5080 if (iter->step->ts.kind != iter->var->ts.kind
5081 || iter->step->ts.type != iter->var->ts.type)
5082 gfc_convert_type (iter->step, &iter->var->ts, 2);
5084 if (iter->start->expr_type == EXPR_CONSTANT
5085 && iter->end->expr_type == EXPR_CONSTANT
5086 && iter->step->expr_type == EXPR_CONSTANT)
5089 if (iter->start->ts.type == BT_INTEGER)
5091 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5092 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5096 sgn = mpfr_sgn (iter->step->value.real);
5097 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5099 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5100 gfc_warning ("DO loop at %L will be executed zero times",
5101 &iter->step->where);
5108 /* Traversal function for find_forall_index. f == 2 signals that
5109 that variable itself is not to be checked - only the references. */
5112 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5114 if (expr->expr_type != EXPR_VARIABLE)
5117 /* A scalar assignment */
5118 if (!expr->ref || *f == 1)
5120 if (expr->symtree->n.sym == sym)
5132 /* Check whether the FORALL index appears in the expression or not.
5133 Returns SUCCESS if SYM is found in EXPR. */
5136 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5138 if (gfc_traverse_expr (expr, sym, forall_index, f))
5145 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5146 to be a scalar INTEGER variable. The subscripts and stride are scalar
5147 INTEGERs, and if stride is a constant it must be nonzero.
5148 Furthermore "A subscript or stride in a forall-triplet-spec shall
5149 not contain a reference to any index-name in the
5150 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5153 resolve_forall_iterators (gfc_forall_iterator *it)
5155 gfc_forall_iterator *iter, *iter2;
5157 for (iter = it; iter; iter = iter->next)
5159 if (gfc_resolve_expr (iter->var) == SUCCESS
5160 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5161 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5164 if (gfc_resolve_expr (iter->start) == SUCCESS
5165 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5166 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5167 &iter->start->where);
5168 if (iter->var->ts.kind != iter->start->ts.kind)
5169 gfc_convert_type (iter->start, &iter->var->ts, 2);
5171 if (gfc_resolve_expr (iter->end) == SUCCESS
5172 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5173 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5175 if (iter->var->ts.kind != iter->end->ts.kind)
5176 gfc_convert_type (iter->end, &iter->var->ts, 2);
5178 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5180 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5181 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5182 &iter->stride->where, "INTEGER");
5184 if (iter->stride->expr_type == EXPR_CONSTANT
5185 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5186 gfc_error ("FORALL stride expression at %L cannot be zero",
5187 &iter->stride->where);
5189 if (iter->var->ts.kind != iter->stride->ts.kind)
5190 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5193 for (iter = it; iter; iter = iter->next)
5194 for (iter2 = iter; iter2; iter2 = iter2->next)
5196 if (find_forall_index (iter2->start,
5197 iter->var->symtree->n.sym, 0) == SUCCESS
5198 || find_forall_index (iter2->end,
5199 iter->var->symtree->n.sym, 0) == SUCCESS
5200 || find_forall_index (iter2->stride,
5201 iter->var->symtree->n.sym, 0) == SUCCESS)
5202 gfc_error ("FORALL index '%s' may not appear in triplet "
5203 "specification at %L", iter->var->symtree->name,
5204 &iter2->start->where);
5209 /* Given a pointer to a symbol that is a derived type, see if it's
5210 inaccessible, i.e. if it's defined in another module and the components are
5211 PRIVATE. The search is recursive if necessary. Returns zero if no
5212 inaccessible components are found, nonzero otherwise. */
5215 derived_inaccessible (gfc_symbol *sym)
5219 if (sym->attr.use_assoc && sym->attr.private_comp)
5222 for (c = sym->components; c; c = c->next)
5224 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.derived))
5232 /* Resolve the argument of a deallocate expression. The expression must be
5233 a pointer or a full array. */
5236 resolve_deallocate_expr (gfc_expr *e)
5238 symbol_attribute attr;
5239 int allocatable, pointer, check_intent_in;
5242 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5243 check_intent_in = 1;
5245 if (gfc_resolve_expr (e) == FAILURE)
5248 if (e->expr_type != EXPR_VARIABLE)
5251 allocatable = e->symtree->n.sym->attr.allocatable;
5252 pointer = e->symtree->n.sym->attr.pointer;
5253 for (ref = e->ref; ref; ref = ref->next)
5256 check_intent_in = 0;
5261 if (ref->u.ar.type != AR_FULL)
5266 allocatable = (ref->u.c.component->as != NULL
5267 && ref->u.c.component->as->type == AS_DEFERRED);
5268 pointer = ref->u.c.component->attr.pointer;
5277 attr = gfc_expr_attr (e);
5279 if (allocatable == 0 && attr.pointer == 0)
5282 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5287 && e->symtree->n.sym->attr.intent == INTENT_IN)
5289 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5290 e->symtree->n.sym->name, &e->where);
5298 /* Returns true if the expression e contains a reference to the symbol sym. */
5300 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5302 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5309 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5311 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5315 /* Given the expression node e for an allocatable/pointer of derived type to be
5316 allocated, get the expression node to be initialized afterwards (needed for
5317 derived types with default initializers, and derived types with allocatable
5318 components that need nullification.) */
5321 expr_to_initialize (gfc_expr *e)
5327 result = gfc_copy_expr (e);
5329 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5330 for (ref = result->ref; ref; ref = ref->next)
5331 if (ref->type == REF_ARRAY && ref->next == NULL)
5333 ref->u.ar.type = AR_FULL;
5335 for (i = 0; i < ref->u.ar.dimen; i++)
5336 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5338 result->rank = ref->u.ar.dimen;
5346 /* Resolve the expression in an ALLOCATE statement, doing the additional
5347 checks to see whether the expression is OK or not. The expression must
5348 have a trailing array reference that gives the size of the array. */
5351 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5353 int i, pointer, allocatable, dimension, check_intent_in;
5354 symbol_attribute attr;
5355 gfc_ref *ref, *ref2;
5362 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5363 check_intent_in = 1;
5365 if (gfc_resolve_expr (e) == FAILURE)
5368 /* Make sure the expression is allocatable or a pointer. If it is
5369 pointer, the next-to-last reference must be a pointer. */
5373 if (e->expr_type != EXPR_VARIABLE)
5376 attr = gfc_expr_attr (e);
5377 pointer = attr.pointer;
5378 dimension = attr.dimension;
5382 allocatable = e->symtree->n.sym->attr.allocatable;
5383 pointer = e->symtree->n.sym->attr.pointer;
5384 dimension = e->symtree->n.sym->attr.dimension;
5386 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5389 check_intent_in = 0;
5394 if (ref->next != NULL)
5399 allocatable = (ref->u.c.component->as != NULL
5400 && ref->u.c.component->as->type == AS_DEFERRED);
5402 pointer = ref->u.c.component->attr.pointer;
5403 dimension = ref->u.c.component->attr.dimension;
5414 if (allocatable == 0 && pointer == 0)
5416 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5422 && e->symtree->n.sym->attr.intent == INTENT_IN)
5424 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5425 e->symtree->n.sym->name, &e->where);
5429 /* Add default initializer for those derived types that need them. */
5430 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
5432 init_st = gfc_get_code ();
5433 init_st->loc = code->loc;
5434 init_st->op = EXEC_INIT_ASSIGN;
5435 init_st->expr1 = expr_to_initialize (e);
5436 init_st->expr2 = init_e;
5437 init_st->next = code->next;
5438 code->next = init_st;
5441 if (pointer && dimension == 0)
5444 /* Make sure the next-to-last reference node is an array specification. */
5446 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5448 gfc_error ("Array specification required in ALLOCATE statement "
5449 "at %L", &e->where);
5453 /* Make sure that the array section reference makes sense in the
5454 context of an ALLOCATE specification. */
5458 for (i = 0; i < ar->dimen; i++)
5460 if (ref2->u.ar.type == AR_ELEMENT)
5463 switch (ar->dimen_type[i])
5469 if (ar->start[i] != NULL
5470 && ar->end[i] != NULL
5471 && ar->stride[i] == NULL)
5474 /* Fall Through... */
5478 gfc_error ("Bad array specification in ALLOCATE statement at %L",
5485 for (a = code->ext.alloc_list; a; a = a->next)
5487 sym = a->expr->symtree->n.sym;
5489 /* TODO - check derived type components. */
5490 if (sym->ts.type == BT_DERIVED)
5493 if ((ar->start[i] != NULL
5494 && gfc_find_sym_in_expr (sym, ar->start[i]))
5495 || (ar->end[i] != NULL
5496 && gfc_find_sym_in_expr (sym, ar->end[i])))
5498 gfc_error ("'%s' must not appear in the array specification at "
5499 "%L in the same ALLOCATE statement where it is "
5500 "itself allocated", sym->name, &ar->where);
5510 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
5512 gfc_expr *stat, *errmsg, *pe, *qe;
5513 gfc_alloc *a, *p, *q;
5515 stat = code->expr1 ? code->expr1 : NULL;
5517 errmsg = code->expr2 ? code->expr2 : NULL;
5519 /* Check the stat variable. */
5522 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
5523 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
5524 stat->symtree->n.sym->name, &stat->where);
5526 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
5527 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
5530 if (stat->ts.type != BT_INTEGER
5531 && !(stat->ref && (stat->ref->type == REF_ARRAY
5532 || stat->ref->type == REF_COMPONENT)))
5533 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
5534 "variable", &stat->where);
5536 for (p = code->ext.alloc_list; p; p = p->next)
5537 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
5538 gfc_error ("Stat-variable at %L shall not be %sd within "
5539 "the same %s statement", &stat->where, fcn, fcn);
5542 /* Check the errmsg variable. */
5546 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
5549 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
5550 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
5551 errmsg->symtree->n.sym->name, &errmsg->where);
5553 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
5554 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
5557 if (errmsg->ts.type != BT_CHARACTER
5559 && (errmsg->ref->type == REF_ARRAY
5560 || errmsg->ref->type == REF_COMPONENT)))
5561 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
5562 "variable", &errmsg->where);
5564 for (p = code->ext.alloc_list; p; p = p->next)
5565 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
5566 gfc_error ("Errmsg-variable at %L shall not be %sd within "
5567 "the same %s statement", &errmsg->where, fcn, fcn);
5570 /* Check that an allocate-object appears only once in the statement.
5571 FIXME: Checking derived types is disabled. */
5572 for (p = code->ext.alloc_list; p; p = p->next)
5575 if ((pe->ref && pe->ref->type != REF_COMPONENT)
5576 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
5578 for (q = p->next; q; q = q->next)
5581 if ((qe->ref && qe->ref->type != REF_COMPONENT)
5582 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
5583 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
5584 gfc_error ("Allocate-object at %L also appears at %L",
5585 &pe->where, &qe->where);
5590 if (strcmp (fcn, "ALLOCATE") == 0)
5592 for (a = code->ext.alloc_list; a; a = a->next)
5593 resolve_allocate_expr (a->expr, code);
5597 for (a = code->ext.alloc_list; a; a = a->next)
5598 resolve_deallocate_expr (a->expr);
5603 /************ SELECT CASE resolution subroutines ************/
5605 /* Callback function for our mergesort variant. Determines interval
5606 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
5607 op1 > op2. Assumes we're not dealing with the default case.
5608 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
5609 There are nine situations to check. */
5612 compare_cases (const gfc_case *op1, const gfc_case *op2)
5616 if (op1->low == NULL) /* op1 = (:L) */
5618 /* op2 = (:N), so overlap. */
5620 /* op2 = (M:) or (M:N), L < M */
5621 if (op2->low != NULL
5622 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5625 else if (op1->high == NULL) /* op1 = (K:) */
5627 /* op2 = (M:), so overlap. */
5629 /* op2 = (:N) or (M:N), K > N */
5630 if (op2->high != NULL
5631 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5634 else /* op1 = (K:L) */
5636 if (op2->low == NULL) /* op2 = (:N), K > N */
5637 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5639 else if (op2->high == NULL) /* op2 = (M:), L < M */
5640 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5642 else /* op2 = (M:N) */
5646 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5649 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5658 /* Merge-sort a double linked case list, detecting overlap in the
5659 process. LIST is the head of the double linked case list before it
5660 is sorted. Returns the head of the sorted list if we don't see any
5661 overlap, or NULL otherwise. */
5664 check_case_overlap (gfc_case *list)
5666 gfc_case *p, *q, *e, *tail;
5667 int insize, nmerges, psize, qsize, cmp, overlap_seen;
5669 /* If the passed list was empty, return immediately. */
5676 /* Loop unconditionally. The only exit from this loop is a return
5677 statement, when we've finished sorting the case list. */
5684 /* Count the number of merges we do in this pass. */
5687 /* Loop while there exists a merge to be done. */
5692 /* Count this merge. */
5695 /* Cut the list in two pieces by stepping INSIZE places
5696 forward in the list, starting from P. */
5699 for (i = 0; i < insize; i++)
5708 /* Now we have two lists. Merge them! */
5709 while (psize > 0 || (qsize > 0 && q != NULL))
5711 /* See from which the next case to merge comes from. */
5714 /* P is empty so the next case must come from Q. */
5719 else if (qsize == 0 || q == NULL)
5728 cmp = compare_cases (p, q);
5731 /* The whole case range for P is less than the
5739 /* The whole case range for Q is greater than
5740 the case range for P. */
5747 /* The cases overlap, or they are the same
5748 element in the list. Either way, we must
5749 issue an error and get the next case from P. */
5750 /* FIXME: Sort P and Q by line number. */
5751 gfc_error ("CASE label at %L overlaps with CASE "
5752 "label at %L", &p->where, &q->where);
5760 /* Add the next element to the merged list. */
5769 /* P has now stepped INSIZE places along, and so has Q. So
5770 they're the same. */
5775 /* If we have done only one merge or none at all, we've
5776 finished sorting the cases. */
5785 /* Otherwise repeat, merging lists twice the size. */
5791 /* Check to see if an expression is suitable for use in a CASE statement.
5792 Makes sure that all case expressions are scalar constants of the same
5793 type. Return FAILURE if anything is wrong. */
5796 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
5798 if (e == NULL) return SUCCESS;
5800 if (e->ts.type != case_expr->ts.type)
5802 gfc_error ("Expression in CASE statement at %L must be of type %s",
5803 &e->where, gfc_basic_typename (case_expr->ts.type));
5807 /* C805 (R808) For a given case-construct, each case-value shall be of
5808 the same type as case-expr. For character type, length differences
5809 are allowed, but the kind type parameters shall be the same. */
5811 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
5813 gfc_error ("Expression in CASE statement at %L must be of kind %d",
5814 &e->where, case_expr->ts.kind);
5818 /* Convert the case value kind to that of case expression kind, if needed.
5819 FIXME: Should a warning be issued? */
5820 if (e->ts.kind != case_expr->ts.kind)
5821 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
5825 gfc_error ("Expression in CASE statement at %L must be scalar",
5834 /* Given a completely parsed select statement, we:
5836 - Validate all expressions and code within the SELECT.
5837 - Make sure that the selection expression is not of the wrong type.
5838 - Make sure that no case ranges overlap.
5839 - Eliminate unreachable cases and unreachable code resulting from
5840 removing case labels.
5842 The standard does allow unreachable cases, e.g. CASE (5:3). But
5843 they are a hassle for code generation, and to prevent that, we just
5844 cut them out here. This is not necessary for overlapping cases
5845 because they are illegal and we never even try to generate code.
5847 We have the additional caveat that a SELECT construct could have
5848 been a computed GOTO in the source code. Fortunately we can fairly
5849 easily work around that here: The case_expr for a "real" SELECT CASE
5850 is in code->expr1, but for a computed GOTO it is in code->expr2. All
5851 we have to do is make sure that the case_expr is a scalar integer
5855 resolve_select (gfc_code *code)
5858 gfc_expr *case_expr;
5859 gfc_case *cp, *default_case, *tail, *head;
5860 int seen_unreachable;
5866 if (code->expr1 == NULL)
5868 /* This was actually a computed GOTO statement. */
5869 case_expr = code->expr2;
5870 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
5871 gfc_error ("Selection expression in computed GOTO statement "
5872 "at %L must be a scalar integer expression",
5875 /* Further checking is not necessary because this SELECT was built
5876 by the compiler, so it should always be OK. Just move the
5877 case_expr from expr2 to expr so that we can handle computed
5878 GOTOs as normal SELECTs from here on. */
5879 code->expr1 = code->expr2;
5884 case_expr = code->expr1;
5886 type = case_expr->ts.type;
5887 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
5889 gfc_error ("Argument of SELECT statement at %L cannot be %s",
5890 &case_expr->where, gfc_typename (&case_expr->ts));
5892 /* Punt. Going on here just produce more garbage error messages. */
5896 if (case_expr->rank != 0)
5898 gfc_error ("Argument of SELECT statement at %L must be a scalar "
5899 "expression", &case_expr->where);
5905 /* PR 19168 has a long discussion concerning a mismatch of the kinds
5906 of the SELECT CASE expression and its CASE values. Walk the lists
5907 of case values, and if we find a mismatch, promote case_expr to
5908 the appropriate kind. */
5910 if (type == BT_LOGICAL || type == BT_INTEGER)
5912 for (body = code->block; body; body = body->block)
5914 /* Walk the case label list. */
5915 for (cp = body->ext.case_list; cp; cp = cp->next)
5917 /* Intercept the DEFAULT case. It does not have a kind. */
5918 if (cp->low == NULL && cp->high == NULL)
5921 /* Unreachable case ranges are discarded, so ignore. */
5922 if (cp->low != NULL && cp->high != NULL
5923 && cp->low != cp->high
5924 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
5927 /* FIXME: Should a warning be issued? */
5929 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
5930 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
5932 if (cp->high != NULL
5933 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
5934 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
5939 /* Assume there is no DEFAULT case. */
5940 default_case = NULL;
5945 for (body = code->block; body; body = body->block)
5947 /* Assume the CASE list is OK, and all CASE labels can be matched. */
5949 seen_unreachable = 0;
5951 /* Walk the case label list, making sure that all case labels
5953 for (cp = body->ext.case_list; cp; cp = cp->next)
5955 /* Count the number of cases in the whole construct. */
5958 /* Intercept the DEFAULT case. */
5959 if (cp->low == NULL && cp->high == NULL)
5961 if (default_case != NULL)
5963 gfc_error ("The DEFAULT CASE at %L cannot be followed "
5964 "by a second DEFAULT CASE at %L",
5965 &default_case->where, &cp->where);
5976 /* Deal with single value cases and case ranges. Errors are
5977 issued from the validation function. */
5978 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
5979 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
5985 if (type == BT_LOGICAL
5986 && ((cp->low == NULL || cp->high == NULL)
5987 || cp->low != cp->high))
5989 gfc_error ("Logical range in CASE statement at %L is not "
5990 "allowed", &cp->low->where);
5995 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
5998 value = cp->low->value.logical == 0 ? 2 : 1;
5999 if (value & seen_logical)
6001 gfc_error ("constant logical value in CASE statement "
6002 "is repeated at %L",
6007 seen_logical |= value;
6010 if (cp->low != NULL && cp->high != NULL
6011 && cp->low != cp->high
6012 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6014 if (gfc_option.warn_surprising)
6015 gfc_warning ("Range specification at %L can never "
6016 "be matched", &cp->where);
6018 cp->unreachable = 1;
6019 seen_unreachable = 1;
6023 /* If the case range can be matched, it can also overlap with
6024 other cases. To make sure it does not, we put it in a
6025 double linked list here. We sort that with a merge sort
6026 later on to detect any overlapping cases. */
6030 head->right = head->left = NULL;
6035 tail->right->left = tail;
6042 /* It there was a failure in the previous case label, give up
6043 for this case label list. Continue with the next block. */
6047 /* See if any case labels that are unreachable have been seen.
6048 If so, we eliminate them. This is a bit of a kludge because
6049 the case lists for a single case statement (label) is a
6050 single forward linked lists. */
6051 if (seen_unreachable)
6053 /* Advance until the first case in the list is reachable. */
6054 while (body->ext.case_list != NULL
6055 && body->ext.case_list->unreachable)
6057 gfc_case *n = body->ext.case_list;
6058 body->ext.case_list = body->ext.case_list->next;
6060 gfc_free_case_list (n);
6063 /* Strip all other unreachable cases. */
6064 if (body->ext.case_list)
6066 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6068 if (cp->next->unreachable)
6070 gfc_case *n = cp->next;
6071 cp->next = cp->next->next;
6073 gfc_free_case_list (n);
6080 /* See if there were overlapping cases. If the check returns NULL,
6081 there was overlap. In that case we don't do anything. If head
6082 is non-NULL, we prepend the DEFAULT case. The sorted list can
6083 then used during code generation for SELECT CASE constructs with
6084 a case expression of a CHARACTER type. */
6087 head = check_case_overlap (head);
6089 /* Prepend the default_case if it is there. */
6090 if (head != NULL && default_case)
6092 default_case->left = NULL;
6093 default_case->right = head;
6094 head->left = default_case;
6098 /* Eliminate dead blocks that may be the result if we've seen
6099 unreachable case labels for a block. */
6100 for (body = code; body && body->block; body = body->block)
6102 if (body->block->ext.case_list == NULL)
6104 /* Cut the unreachable block from the code chain. */
6105 gfc_code *c = body->block;
6106 body->block = c->block;
6108 /* Kill the dead block, but not the blocks below it. */
6110 gfc_free_statements (c);
6114 /* More than two cases is legal but insane for logical selects.
6115 Issue a warning for it. */
6116 if (gfc_option.warn_surprising && type == BT_LOGICAL
6118 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6123 /* Resolve a transfer statement. This is making sure that:
6124 -- a derived type being transferred has only non-pointer components
6125 -- a derived type being transferred doesn't have private components, unless
6126 it's being transferred from the module where the type was defined
6127 -- we're not trying to transfer a whole assumed size array. */
6130 resolve_transfer (gfc_code *code)
6139 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6142 sym = exp->symtree->n.sym;
6145 /* Go to actual component transferred. */
6146 for (ref = code->expr1->ref; ref; ref = ref->next)
6147 if (ref->type == REF_COMPONENT)
6148 ts = &ref->u.c.component->ts;
6150 if (ts->type == BT_DERIVED)
6152 /* Check that transferred derived type doesn't contain POINTER
6154 if (ts->derived->attr.pointer_comp)
6156 gfc_error ("Data transfer element at %L cannot have "
6157 "POINTER components", &code->loc);
6161 if (ts->derived->attr.alloc_comp)
6163 gfc_error ("Data transfer element at %L cannot have "
6164 "ALLOCATABLE components", &code->loc);
6168 if (derived_inaccessible (ts->derived))
6170 gfc_error ("Data transfer element at %L cannot have "
6171 "PRIVATE components",&code->loc);
6176 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6177 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6179 gfc_error ("Data transfer element at %L cannot be a full reference to "
6180 "an assumed-size array", &code->loc);
6186 /*********** Toplevel code resolution subroutines ***********/
6188 /* Find the set of labels that are reachable from this block. We also
6189 record the last statement in each block. */
6192 find_reachable_labels (gfc_code *block)
6199 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6201 /* Collect labels in this block. We don't keep those corresponding
6202 to END {IF|SELECT}, these are checked in resolve_branch by going
6203 up through the code_stack. */
6204 for (c = block; c; c = c->next)
6206 if (c->here && c->op != EXEC_END_BLOCK)
6207 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6210 /* Merge with labels from parent block. */
6213 gcc_assert (cs_base->prev->reachable_labels);
6214 bitmap_ior_into (cs_base->reachable_labels,
6215 cs_base->prev->reachable_labels);
6219 /* Given a branch to a label, see if the branch is conforming.
6220 The code node describes where the branch is located. */
6223 resolve_branch (gfc_st_label *label, gfc_code *code)
6230 /* Step one: is this a valid branching target? */
6232 if (label->defined == ST_LABEL_UNKNOWN)
6234 gfc_error ("Label %d referenced at %L is never defined", label->value,
6239 if (label->defined != ST_LABEL_TARGET)
6241 gfc_error ("Statement at %L is not a valid branch target statement "
6242 "for the branch statement at %L", &label->where, &code->loc);
6246 /* Step two: make sure this branch is not a branch to itself ;-) */
6248 if (code->here == label)
6250 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6254 /* Step three: See if the label is in the same block as the
6255 branching statement. The hard work has been done by setting up
6256 the bitmap reachable_labels. */
6258 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6261 /* Step four: If we haven't found the label in the bitmap, it may
6262 still be the label of the END of the enclosing block, in which
6263 case we find it by going up the code_stack. */
6265 for (stack = cs_base; stack; stack = stack->prev)
6266 if (stack->current->next && stack->current->next->here == label)
6271 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6275 /* The label is not in an enclosing block, so illegal. This was
6276 allowed in Fortran 66, so we allow it as extension. No
6277 further checks are necessary in this case. */
6278 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6279 "as the GOTO statement at %L", &label->where,
6285 /* Check whether EXPR1 has the same shape as EXPR2. */
6288 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6290 mpz_t shape[GFC_MAX_DIMENSIONS];
6291 mpz_t shape2[GFC_MAX_DIMENSIONS];
6292 gfc_try result = FAILURE;
6295 /* Compare the rank. */
6296 if (expr1->rank != expr2->rank)
6299 /* Compare the size of each dimension. */
6300 for (i=0; i<expr1->rank; i++)
6302 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6305 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6308 if (mpz_cmp (shape[i], shape2[i]))
6312 /* When either of the two expression is an assumed size array, we
6313 ignore the comparison of dimension sizes. */
6318 for (i--; i >= 0; i--)
6320 mpz_clear (shape[i]);
6321 mpz_clear (shape2[i]);
6327 /* Check whether a WHERE assignment target or a WHERE mask expression
6328 has the same shape as the outmost WHERE mask expression. */
6331 resolve_where (gfc_code *code, gfc_expr *mask)
6337 cblock = code->block;
6339 /* Store the first WHERE mask-expr of the WHERE statement or construct.
6340 In case of nested WHERE, only the outmost one is stored. */
6341 if (mask == NULL) /* outmost WHERE */
6343 else /* inner WHERE */
6350 /* Check if the mask-expr has a consistent shape with the
6351 outmost WHERE mask-expr. */
6352 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
6353 gfc_error ("WHERE mask at %L has inconsistent shape",
6354 &cblock->expr1->where);
6357 /* the assignment statement of a WHERE statement, or the first
6358 statement in where-body-construct of a WHERE construct */
6359 cnext = cblock->next;
6364 /* WHERE assignment statement */
6367 /* Check shape consistent for WHERE assignment target. */
6368 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
6369 gfc_error ("WHERE assignment target at %L has "
6370 "inconsistent shape", &cnext->expr1->where);
6374 case EXEC_ASSIGN_CALL:
6375 resolve_call (cnext);
6376 if (!cnext->resolved_sym->attr.elemental)
6377 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6378 &cnext->ext.actual->expr->where);
6381 /* WHERE or WHERE construct is part of a where-body-construct */
6383 resolve_where (cnext, e);
6387 gfc_error ("Unsupported statement inside WHERE at %L",
6390 /* the next statement within the same where-body-construct */
6391 cnext = cnext->next;
6393 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6394 cblock = cblock->block;
6399 /* Resolve assignment in FORALL construct.
6400 NVAR is the number of FORALL index variables, and VAR_EXPR records the
6401 FORALL index variables. */
6404 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
6408 for (n = 0; n < nvar; n++)
6410 gfc_symbol *forall_index;
6412 forall_index = var_expr[n]->symtree->n.sym;
6414 /* Check whether the assignment target is one of the FORALL index
6416 if ((code->expr1->expr_type == EXPR_VARIABLE)
6417 && (code->expr1->symtree->n.sym == forall_index))
6418 gfc_error ("Assignment to a FORALL index variable at %L",
6419 &code->expr1->where);
6422 /* If one of the FORALL index variables doesn't appear in the
6423 assignment variable, then there could be a many-to-one
6424 assignment. Emit a warning rather than an error because the
6425 mask could be resolving this problem. */
6426 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
6427 gfc_warning ("The FORALL with index '%s' is not used on the "
6428 "left side of the assignment at %L and so might "
6429 "cause multiple assignment to this object",
6430 var_expr[n]->symtree->name, &code->expr1->where);
6436 /* Resolve WHERE statement in FORALL construct. */
6439 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
6440 gfc_expr **var_expr)
6445 cblock = code->block;
6448 /* the assignment statement of a WHERE statement, or the first
6449 statement in where-body-construct of a WHERE construct */
6450 cnext = cblock->next;
6455 /* WHERE assignment statement */
6457 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
6460 /* WHERE operator assignment statement */
6461 case EXEC_ASSIGN_CALL:
6462 resolve_call (cnext);
6463 if (!cnext->resolved_sym->attr.elemental)
6464 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6465 &cnext->ext.actual->expr->where);
6468 /* WHERE or WHERE construct is part of a where-body-construct */
6470 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
6474 gfc_error ("Unsupported statement inside WHERE at %L",
6477 /* the next statement within the same where-body-construct */
6478 cnext = cnext->next;
6480 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6481 cblock = cblock->block;
6486 /* Traverse the FORALL body to check whether the following errors exist:
6487 1. For assignment, check if a many-to-one assignment happens.
6488 2. For WHERE statement, check the WHERE body to see if there is any
6489 many-to-one assignment. */
6492 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
6496 c = code->block->next;
6502 case EXEC_POINTER_ASSIGN:
6503 gfc_resolve_assign_in_forall (c, nvar, var_expr);
6506 case EXEC_ASSIGN_CALL:
6510 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
6511 there is no need to handle it here. */
6515 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
6520 /* The next statement in the FORALL body. */
6526 /* Counts the number of iterators needed inside a forall construct, including
6527 nested forall constructs. This is used to allocate the needed memory
6528 in gfc_resolve_forall. */
6531 gfc_count_forall_iterators (gfc_code *code)
6533 int max_iters, sub_iters, current_iters;
6534 gfc_forall_iterator *fa;
6536 gcc_assert(code->op == EXEC_FORALL);
6540 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6543 code = code->block->next;
6547 if (code->op == EXEC_FORALL)
6549 sub_iters = gfc_count_forall_iterators (code);
6550 if (sub_iters > max_iters)
6551 max_iters = sub_iters;
6556 return current_iters + max_iters;
6560 /* Given a FORALL construct, first resolve the FORALL iterator, then call
6561 gfc_resolve_forall_body to resolve the FORALL body. */
6564 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
6566 static gfc_expr **var_expr;
6567 static int total_var = 0;
6568 static int nvar = 0;
6570 gfc_forall_iterator *fa;
6575 /* Start to resolve a FORALL construct */
6576 if (forall_save == 0)
6578 /* Count the total number of FORALL index in the nested FORALL
6579 construct in order to allocate the VAR_EXPR with proper size. */
6580 total_var = gfc_count_forall_iterators (code);
6582 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
6583 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
6586 /* The information about FORALL iterator, including FORALL index start, end
6587 and stride. The FORALL index can not appear in start, end or stride. */
6588 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6590 /* Check if any outer FORALL index name is the same as the current
6592 for (i = 0; i < nvar; i++)
6594 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
6596 gfc_error ("An outer FORALL construct already has an index "
6597 "with this name %L", &fa->var->where);
6601 /* Record the current FORALL index. */
6602 var_expr[nvar] = gfc_copy_expr (fa->var);
6606 /* No memory leak. */
6607 gcc_assert (nvar <= total_var);
6610 /* Resolve the FORALL body. */
6611 gfc_resolve_forall_body (code, nvar, var_expr);
6613 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
6614 gfc_resolve_blocks (code->block, ns);
6618 /* Free only the VAR_EXPRs allocated in this frame. */
6619 for (i = nvar; i < tmp; i++)
6620 gfc_free_expr (var_expr[i]);
6624 /* We are in the outermost FORALL construct. */
6625 gcc_assert (forall_save == 0);
6627 /* VAR_EXPR is not needed any more. */
6628 gfc_free (var_expr);
6634 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
6637 static void resolve_code (gfc_code *, gfc_namespace *);
6640 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
6644 for (; b; b = b->block)
6646 t = gfc_resolve_expr (b->expr1);
6647 if (gfc_resolve_expr (b->expr2) == FAILURE)
6653 if (t == SUCCESS && b->expr1 != NULL
6654 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
6655 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6662 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
6663 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
6668 resolve_branch (b->label1, b);
6681 case EXEC_OMP_ATOMIC:
6682 case EXEC_OMP_CRITICAL:
6684 case EXEC_OMP_MASTER:
6685 case EXEC_OMP_ORDERED:
6686 case EXEC_OMP_PARALLEL:
6687 case EXEC_OMP_PARALLEL_DO:
6688 case EXEC_OMP_PARALLEL_SECTIONS:
6689 case EXEC_OMP_PARALLEL_WORKSHARE:
6690 case EXEC_OMP_SECTIONS:
6691 case EXEC_OMP_SINGLE:
6693 case EXEC_OMP_TASKWAIT:
6694 case EXEC_OMP_WORKSHARE:
6698 gfc_internal_error ("resolve_block(): Bad block type");
6701 resolve_code (b->next, ns);
6706 /* Does everything to resolve an ordinary assignment. Returns true
6707 if this is an interface assignment. */
6709 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
6719 if (gfc_extend_assign (code, ns) == SUCCESS)
6721 lhs = code->ext.actual->expr;
6722 rhs = code->ext.actual->next->expr;
6723 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6725 gfc_error ("Subroutine '%s' called instead of assignment at "
6726 "%L must be PURE", code->symtree->n.sym->name,
6731 /* Make a temporary rhs when there is a default initializer
6732 and rhs is the same symbol as the lhs. */
6733 if (rhs->expr_type == EXPR_VARIABLE
6734 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6735 && has_default_initializer (rhs->symtree->n.sym->ts.derived)
6736 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6737 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6746 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
6747 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
6748 &code->loc) == FAILURE)
6751 /* Handle the case of a BOZ literal on the RHS. */
6752 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
6755 if (gfc_option.warn_surprising)
6756 gfc_warning ("BOZ literal at %L is bitwise transferred "
6757 "non-integer symbol '%s'", &code->loc,
6758 lhs->symtree->n.sym->name);
6760 if (!gfc_convert_boz (rhs, &lhs->ts))
6762 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
6764 if (rc == ARITH_UNDERFLOW)
6765 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
6766 ". This check can be disabled with the option "
6767 "-fno-range-check", &rhs->where);
6768 else if (rc == ARITH_OVERFLOW)
6769 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
6770 ". This check can be disabled with the option "
6771 "-fno-range-check", &rhs->where);
6772 else if (rc == ARITH_NAN)
6773 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
6774 ". This check can be disabled with the option "
6775 "-fno-range-check", &rhs->where);
6781 if (lhs->ts.type == BT_CHARACTER
6782 && gfc_option.warn_character_truncation)
6784 if (lhs->ts.cl != NULL
6785 && lhs->ts.cl->length != NULL
6786 && lhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6787 llen = mpz_get_si (lhs->ts.cl->length->value.integer);
6789 if (rhs->expr_type == EXPR_CONSTANT)
6790 rlen = rhs->value.character.length;
6792 else if (rhs->ts.cl != NULL
6793 && rhs->ts.cl->length != NULL
6794 && rhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6795 rlen = mpz_get_si (rhs->ts.cl->length->value.integer);
6797 if (rlen && llen && rlen > llen)
6798 gfc_warning_now ("CHARACTER expression will be truncated "
6799 "in assignment (%d/%d) at %L",
6800 llen, rlen, &code->loc);
6803 /* Ensure that a vector index expression for the lvalue is evaluated
6804 to a temporary if the lvalue symbol is referenced in it. */
6807 for (ref = lhs->ref; ref; ref= ref->next)
6808 if (ref->type == REF_ARRAY)
6810 for (n = 0; n < ref->u.ar.dimen; n++)
6811 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
6812 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
6813 ref->u.ar.start[n]))
6815 = gfc_get_parentheses (ref->u.ar.start[n]);
6819 if (gfc_pure (NULL))
6821 if (gfc_impure_variable (lhs->symtree->n.sym))
6823 gfc_error ("Cannot assign to variable '%s' in PURE "
6825 lhs->symtree->n.sym->name,
6830 if (lhs->ts.type == BT_DERIVED
6831 && lhs->expr_type == EXPR_VARIABLE
6832 && lhs->ts.derived->attr.pointer_comp
6833 && gfc_impure_variable (rhs->symtree->n.sym))
6835 gfc_error ("The impure variable at %L is assigned to "
6836 "a derived type variable with a POINTER "
6837 "component in a PURE procedure (12.6)",
6843 gfc_check_assign (lhs, rhs, 1);
6847 /* Given a block of code, recursively resolve everything pointed to by this
6851 resolve_code (gfc_code *code, gfc_namespace *ns)
6853 int omp_workshare_save;
6858 frame.prev = cs_base;
6862 find_reachable_labels (code);
6864 for (; code; code = code->next)
6866 frame.current = code;
6867 forall_save = forall_flag;
6869 if (code->op == EXEC_FORALL)
6872 gfc_resolve_forall (code, ns, forall_save);
6875 else if (code->block)
6877 omp_workshare_save = -1;
6880 case EXEC_OMP_PARALLEL_WORKSHARE:
6881 omp_workshare_save = omp_workshare_flag;
6882 omp_workshare_flag = 1;
6883 gfc_resolve_omp_parallel_blocks (code, ns);
6885 case EXEC_OMP_PARALLEL:
6886 case EXEC_OMP_PARALLEL_DO:
6887 case EXEC_OMP_PARALLEL_SECTIONS:
6889 omp_workshare_save = omp_workshare_flag;
6890 omp_workshare_flag = 0;
6891 gfc_resolve_omp_parallel_blocks (code, ns);
6894 gfc_resolve_omp_do_blocks (code, ns);
6896 case EXEC_OMP_WORKSHARE:
6897 omp_workshare_save = omp_workshare_flag;
6898 omp_workshare_flag = 1;
6901 gfc_resolve_blocks (code->block, ns);
6905 if (omp_workshare_save != -1)
6906 omp_workshare_flag = omp_workshare_save;
6910 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
6911 t = gfc_resolve_expr (code->expr1);
6912 forall_flag = forall_save;
6914 if (gfc_resolve_expr (code->expr2) == FAILURE)
6920 case EXEC_END_BLOCK:
6930 /* Keep track of which entry we are up to. */
6931 current_entry_id = code->ext.entry->id;
6935 resolve_where (code, NULL);
6939 if (code->expr1 != NULL)
6941 if (code->expr1->ts.type != BT_INTEGER)
6942 gfc_error ("ASSIGNED GOTO statement at %L requires an "
6943 "INTEGER variable", &code->expr1->where);
6944 else if (code->expr1->symtree->n.sym->attr.assign != 1)
6945 gfc_error ("Variable '%s' has not been assigned a target "
6946 "label at %L", code->expr1->symtree->n.sym->name,
6947 &code->expr1->where);
6950 resolve_branch (code->label1, code);
6954 if (code->expr1 != NULL
6955 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
6956 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
6957 "INTEGER return specifier", &code->expr1->where);
6960 case EXEC_INIT_ASSIGN:
6961 case EXEC_END_PROCEDURE:
6968 if (resolve_ordinary_assign (code, ns))
6973 case EXEC_LABEL_ASSIGN:
6974 if (code->label1->defined == ST_LABEL_UNKNOWN)
6975 gfc_error ("Label %d referenced at %L is never defined",
6976 code->label1->value, &code->label1->where);
6978 && (code->expr1->expr_type != EXPR_VARIABLE
6979 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
6980 || code->expr1->symtree->n.sym->ts.kind
6981 != gfc_default_integer_kind
6982 || code->expr1->symtree->n.sym->as != NULL))
6983 gfc_error ("ASSIGN statement at %L requires a scalar "
6984 "default INTEGER variable", &code->expr1->where);
6987 case EXEC_POINTER_ASSIGN:
6991 gfc_check_pointer_assign (code->expr1, code->expr2);
6994 case EXEC_ARITHMETIC_IF:
6996 && code->expr1->ts.type != BT_INTEGER
6997 && code->expr1->ts.type != BT_REAL)
6998 gfc_error ("Arithmetic IF statement at %L requires a numeric "
6999 "expression", &code->expr1->where);
7001 resolve_branch (code->label1, code);
7002 resolve_branch (code->label2, code);
7003 resolve_branch (code->label3, code);
7007 if (t == SUCCESS && code->expr1 != NULL
7008 && (code->expr1->ts.type != BT_LOGICAL
7009 || code->expr1->rank != 0))
7010 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7011 &code->expr1->where);
7016 resolve_call (code);
7020 resolve_typebound_call (code);
7024 resolve_ppc_call (code);
7028 /* Select is complicated. Also, a SELECT construct could be
7029 a transformed computed GOTO. */
7030 resolve_select (code);
7034 if (code->ext.iterator != NULL)
7036 gfc_iterator *iter = code->ext.iterator;
7037 if (gfc_resolve_iterator (iter, true) != FAILURE)
7038 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7043 if (code->expr1 == NULL)
7044 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7046 && (code->expr1->rank != 0
7047 || code->expr1->ts.type != BT_LOGICAL))
7048 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7049 "a scalar LOGICAL expression", &code->expr1->where);
7054 resolve_allocate_deallocate (code, "ALLOCATE");
7058 case EXEC_DEALLOCATE:
7060 resolve_allocate_deallocate (code, "DEALLOCATE");
7065 if (gfc_resolve_open (code->ext.open) == FAILURE)
7068 resolve_branch (code->ext.open->err, code);
7072 if (gfc_resolve_close (code->ext.close) == FAILURE)
7075 resolve_branch (code->ext.close->err, code);
7078 case EXEC_BACKSPACE:
7082 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7085 resolve_branch (code->ext.filepos->err, code);
7089 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7092 resolve_branch (code->ext.inquire->err, code);
7096 gcc_assert (code->ext.inquire != NULL);
7097 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7100 resolve_branch (code->ext.inquire->err, code);
7104 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7107 resolve_branch (code->ext.wait->err, code);
7108 resolve_branch (code->ext.wait->end, code);
7109 resolve_branch (code->ext.wait->eor, code);
7114 if (gfc_resolve_dt (code->ext.dt) == FAILURE)
7117 resolve_branch (code->ext.dt->err, code);
7118 resolve_branch (code->ext.dt->end, code);
7119 resolve_branch (code->ext.dt->eor, code);
7123 resolve_transfer (code);
7127 resolve_forall_iterators (code->ext.forall_iterator);
7129 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7130 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7131 "expression", &code->expr1->where);
7134 case EXEC_OMP_ATOMIC:
7135 case EXEC_OMP_BARRIER:
7136 case EXEC_OMP_CRITICAL:
7137 case EXEC_OMP_FLUSH:
7139 case EXEC_OMP_MASTER:
7140 case EXEC_OMP_ORDERED:
7141 case EXEC_OMP_SECTIONS:
7142 case EXEC_OMP_SINGLE:
7143 case EXEC_OMP_TASKWAIT:
7144 case EXEC_OMP_WORKSHARE:
7145 gfc_resolve_omp_directive (code, ns);
7148 case EXEC_OMP_PARALLEL:
7149 case EXEC_OMP_PARALLEL_DO:
7150 case EXEC_OMP_PARALLEL_SECTIONS:
7151 case EXEC_OMP_PARALLEL_WORKSHARE:
7153 omp_workshare_save = omp_workshare_flag;
7154 omp_workshare_flag = 0;
7155 gfc_resolve_omp_directive (code, ns);
7156 omp_workshare_flag = omp_workshare_save;
7160 gfc_internal_error ("resolve_code(): Bad statement code");
7164 cs_base = frame.prev;
7168 /* Resolve initial values and make sure they are compatible with
7172 resolve_values (gfc_symbol *sym)
7174 if (sym->value == NULL)
7177 if (gfc_resolve_expr (sym->value) == FAILURE)
7180 gfc_check_assign_symbol (sym, sym->value);
7184 /* Verify the binding labels for common blocks that are BIND(C). The label
7185 for a BIND(C) common block must be identical in all scoping units in which
7186 the common block is declared. Further, the binding label can not collide
7187 with any other global entity in the program. */
7190 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7192 if (comm_block_tree->n.common->is_bind_c == 1)
7194 gfc_gsymbol *binding_label_gsym;
7195 gfc_gsymbol *comm_name_gsym;
7197 /* See if a global symbol exists by the common block's name. It may
7198 be NULL if the common block is use-associated. */
7199 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7200 comm_block_tree->n.common->name);
7201 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7202 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7203 "with the global entity '%s' at %L",
7204 comm_block_tree->n.common->binding_label,
7205 comm_block_tree->n.common->name,
7206 &(comm_block_tree->n.common->where),
7207 comm_name_gsym->name, &(comm_name_gsym->where));
7208 else if (comm_name_gsym != NULL
7209 && strcmp (comm_name_gsym->name,
7210 comm_block_tree->n.common->name) == 0)
7212 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7214 if (comm_name_gsym->binding_label == NULL)
7215 /* No binding label for common block stored yet; save this one. */
7216 comm_name_gsym->binding_label =
7217 comm_block_tree->n.common->binding_label;
7219 if (strcmp (comm_name_gsym->binding_label,
7220 comm_block_tree->n.common->binding_label) != 0)
7222 /* Common block names match but binding labels do not. */
7223 gfc_error ("Binding label '%s' for common block '%s' at %L "
7224 "does not match the binding label '%s' for common "
7226 comm_block_tree->n.common->binding_label,
7227 comm_block_tree->n.common->name,
7228 &(comm_block_tree->n.common->where),
7229 comm_name_gsym->binding_label,
7230 comm_name_gsym->name,
7231 &(comm_name_gsym->where));
7236 /* There is no binding label (NAME="") so we have nothing further to
7237 check and nothing to add as a global symbol for the label. */
7238 if (comm_block_tree->n.common->binding_label[0] == '\0' )
7241 binding_label_gsym =
7242 gfc_find_gsymbol (gfc_gsym_root,
7243 comm_block_tree->n.common->binding_label);
7244 if (binding_label_gsym == NULL)
7246 /* Need to make a global symbol for the binding label to prevent
7247 it from colliding with another. */
7248 binding_label_gsym =
7249 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
7250 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
7251 binding_label_gsym->type = GSYM_COMMON;
7255 /* If comm_name_gsym is NULL, the name common block is use
7256 associated and the name could be colliding. */
7257 if (binding_label_gsym->type != GSYM_COMMON)
7258 gfc_error ("Binding label '%s' for common block '%s' at %L "
7259 "collides with the global entity '%s' at %L",
7260 comm_block_tree->n.common->binding_label,
7261 comm_block_tree->n.common->name,
7262 &(comm_block_tree->n.common->where),
7263 binding_label_gsym->name,
7264 &(binding_label_gsym->where));
7265 else if (comm_name_gsym != NULL
7266 && (strcmp (binding_label_gsym->name,
7267 comm_name_gsym->binding_label) != 0)
7268 && (strcmp (binding_label_gsym->sym_name,
7269 comm_name_gsym->name) != 0))
7270 gfc_error ("Binding label '%s' for common block '%s' at %L "
7271 "collides with global entity '%s' at %L",
7272 binding_label_gsym->name, binding_label_gsym->sym_name,
7273 &(comm_block_tree->n.common->where),
7274 comm_name_gsym->name, &(comm_name_gsym->where));
7282 /* Verify any BIND(C) derived types in the namespace so we can report errors
7283 for them once, rather than for each variable declared of that type. */
7286 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
7288 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
7289 && derived_sym->attr.is_bind_c == 1)
7290 verify_bind_c_derived_type (derived_sym);
7296 /* Verify that any binding labels used in a given namespace do not collide
7297 with the names or binding labels of any global symbols. */
7300 gfc_verify_binding_labels (gfc_symbol *sym)
7304 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
7305 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
7307 gfc_gsymbol *bind_c_sym;
7309 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
7310 if (bind_c_sym != NULL
7311 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
7313 if (sym->attr.if_source == IFSRC_DECL
7314 && (bind_c_sym->type != GSYM_SUBROUTINE
7315 && bind_c_sym->type != GSYM_FUNCTION)
7316 && ((sym->attr.contained == 1
7317 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
7318 || (sym->attr.use_assoc == 1
7319 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
7321 /* Make sure global procedures don't collide with anything. */
7322 gfc_error ("Binding label '%s' at %L collides with the global "
7323 "entity '%s' at %L", sym->binding_label,
7324 &(sym->declared_at), bind_c_sym->name,
7325 &(bind_c_sym->where));
7328 else if (sym->attr.contained == 0
7329 && (sym->attr.if_source == IFSRC_IFBODY
7330 && sym->attr.flavor == FL_PROCEDURE)
7331 && (bind_c_sym->sym_name != NULL
7332 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
7334 /* Make sure procedures in interface bodies don't collide. */
7335 gfc_error ("Binding label '%s' in interface body at %L collides "
7336 "with the global entity '%s' at %L",
7338 &(sym->declared_at), bind_c_sym->name,
7339 &(bind_c_sym->where));
7342 else if (sym->attr.contained == 0
7343 && sym->attr.if_source == IFSRC_UNKNOWN)
7344 if ((sym->attr.use_assoc && bind_c_sym->mod_name
7345 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
7346 || sym->attr.use_assoc == 0)
7348 gfc_error ("Binding label '%s' at %L collides with global "
7349 "entity '%s' at %L", sym->binding_label,
7350 &(sym->declared_at), bind_c_sym->name,
7351 &(bind_c_sym->where));
7356 /* Clear the binding label to prevent checking multiple times. */
7357 sym->binding_label[0] = '\0';
7359 else if (bind_c_sym == NULL)
7361 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
7362 bind_c_sym->where = sym->declared_at;
7363 bind_c_sym->sym_name = sym->name;
7365 if (sym->attr.use_assoc == 1)
7366 bind_c_sym->mod_name = sym->module;
7368 if (sym->ns->proc_name != NULL)
7369 bind_c_sym->mod_name = sym->ns->proc_name->name;
7371 if (sym->attr.contained == 0)
7373 if (sym->attr.subroutine)
7374 bind_c_sym->type = GSYM_SUBROUTINE;
7375 else if (sym->attr.function)
7376 bind_c_sym->type = GSYM_FUNCTION;
7384 /* Resolve an index expression. */
7387 resolve_index_expr (gfc_expr *e)
7389 if (gfc_resolve_expr (e) == FAILURE)
7392 if (gfc_simplify_expr (e, 0) == FAILURE)
7395 if (gfc_specification_expr (e) == FAILURE)
7401 /* Resolve a charlen structure. */
7404 resolve_charlen (gfc_charlen *cl)
7413 specification_expr = 1;
7415 if (resolve_index_expr (cl->length) == FAILURE)
7417 specification_expr = 0;
7421 /* "If the character length parameter value evaluates to a negative
7422 value, the length of character entities declared is zero." */
7423 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
7425 gfc_warning_now ("CHARACTER variable has zero length at %L",
7426 &cl->length->where);
7427 gfc_replace_expr (cl->length, gfc_int_expr (0));
7430 /* Check that the character length is not too large. */
7431 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
7432 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
7433 && cl->length->ts.type == BT_INTEGER
7434 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
7436 gfc_error ("String length at %L is too large", &cl->length->where);
7444 /* Test for non-constant shape arrays. */
7447 is_non_constant_shape_array (gfc_symbol *sym)
7453 not_constant = false;
7454 if (sym->as != NULL)
7456 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
7457 has not been simplified; parameter array references. Do the
7458 simplification now. */
7459 for (i = 0; i < sym->as->rank; i++)
7461 e = sym->as->lower[i];
7462 if (e && (resolve_index_expr (e) == FAILURE
7463 || !gfc_is_constant_expr (e)))
7464 not_constant = true;
7466 e = sym->as->upper[i];
7467 if (e && (resolve_index_expr (e) == FAILURE
7468 || !gfc_is_constant_expr (e)))
7469 not_constant = true;
7472 return not_constant;
7475 /* Given a symbol and an initialization expression, add code to initialize
7476 the symbol to the function entry. */
7478 build_init_assign (gfc_symbol *sym, gfc_expr *init)
7482 gfc_namespace *ns = sym->ns;
7484 /* Search for the function namespace if this is a contained
7485 function without an explicit result. */
7486 if (sym->attr.function && sym == sym->result
7487 && sym->name != sym->ns->proc_name->name)
7490 for (;ns; ns = ns->sibling)
7491 if (strcmp (ns->proc_name->name, sym->name) == 0)
7497 gfc_free_expr (init);
7501 /* Build an l-value expression for the result. */
7502 lval = gfc_lval_expr_from_sym (sym);
7504 /* Add the code at scope entry. */
7505 init_st = gfc_get_code ();
7506 init_st->next = ns->code;
7509 /* Assign the default initializer to the l-value. */
7510 init_st->loc = sym->declared_at;
7511 init_st->op = EXEC_INIT_ASSIGN;
7512 init_st->expr1 = lval;
7513 init_st->expr2 = init;
7516 /* Assign the default initializer to a derived type variable or result. */
7519 apply_default_init (gfc_symbol *sym)
7521 gfc_expr *init = NULL;
7523 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7526 if (sym->ts.type == BT_DERIVED && sym->ts.derived)
7527 init = gfc_default_initializer (&sym->ts);
7532 build_init_assign (sym, init);
7535 /* Build an initializer for a local integer, real, complex, logical, or
7536 character variable, based on the command line flags finit-local-zero,
7537 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
7538 null if the symbol should not have a default initialization. */
7540 build_default_init_expr (gfc_symbol *sym)
7543 gfc_expr *init_expr;
7546 /* These symbols should never have a default initialization. */
7547 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
7548 || sym->attr.external
7550 || sym->attr.pointer
7551 || sym->attr.in_equivalence
7552 || sym->attr.in_common
7555 || sym->attr.cray_pointee
7556 || sym->attr.cray_pointer)
7559 /* Now we'll try to build an initializer expression. */
7560 init_expr = gfc_get_expr ();
7561 init_expr->expr_type = EXPR_CONSTANT;
7562 init_expr->ts.type = sym->ts.type;
7563 init_expr->ts.kind = sym->ts.kind;
7564 init_expr->where = sym->declared_at;
7566 /* We will only initialize integers, reals, complex, logicals, and
7567 characters, and only if the corresponding command-line flags
7568 were set. Otherwise, we free init_expr and return null. */
7569 switch (sym->ts.type)
7572 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
7573 mpz_init_set_si (init_expr->value.integer,
7574 gfc_option.flag_init_integer_value);
7577 gfc_free_expr (init_expr);
7583 mpfr_init (init_expr->value.real);
7584 switch (gfc_option.flag_init_real)
7586 case GFC_INIT_REAL_SNAN:
7587 init_expr->is_snan = 1;
7589 case GFC_INIT_REAL_NAN:
7590 mpfr_set_nan (init_expr->value.real);
7593 case GFC_INIT_REAL_INF:
7594 mpfr_set_inf (init_expr->value.real, 1);
7597 case GFC_INIT_REAL_NEG_INF:
7598 mpfr_set_inf (init_expr->value.real, -1);
7601 case GFC_INIT_REAL_ZERO:
7602 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
7606 gfc_free_expr (init_expr);
7614 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
7616 mpfr_init (init_expr->value.complex.r);
7617 mpfr_init (init_expr->value.complex.i);
7619 switch (gfc_option.flag_init_real)
7621 case GFC_INIT_REAL_SNAN:
7622 init_expr->is_snan = 1;
7624 case GFC_INIT_REAL_NAN:
7625 mpfr_set_nan (mpc_realref (init_expr->value.complex));
7626 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
7629 case GFC_INIT_REAL_INF:
7630 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
7631 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
7634 case GFC_INIT_REAL_NEG_INF:
7635 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
7636 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
7639 case GFC_INIT_REAL_ZERO:
7641 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
7643 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
7644 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
7649 gfc_free_expr (init_expr);
7656 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
7657 init_expr->value.logical = 0;
7658 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
7659 init_expr->value.logical = 1;
7662 gfc_free_expr (init_expr);
7668 /* For characters, the length must be constant in order to
7669 create a default initializer. */
7670 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
7671 && sym->ts.cl->length
7672 && sym->ts.cl->length->expr_type == EXPR_CONSTANT)
7674 char_len = mpz_get_si (sym->ts.cl->length->value.integer);
7675 init_expr->value.character.length = char_len;
7676 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
7677 for (i = 0; i < char_len; i++)
7678 init_expr->value.character.string[i]
7679 = (unsigned char) gfc_option.flag_init_character_value;
7683 gfc_free_expr (init_expr);
7689 gfc_free_expr (init_expr);
7695 /* Add an initialization expression to a local variable. */
7697 apply_default_init_local (gfc_symbol *sym)
7699 gfc_expr *init = NULL;
7701 /* The symbol should be a variable or a function return value. */
7702 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7703 || (sym->attr.function && sym->result != sym))
7706 /* Try to build the initializer expression. If we can't initialize
7707 this symbol, then init will be NULL. */
7708 init = build_default_init_expr (sym);
7712 /* For saved variables, we don't want to add an initializer at
7713 function entry, so we just add a static initializer. */
7714 if (sym->attr.save || sym->ns->save_all)
7716 /* Don't clobber an existing initializer! */
7717 gcc_assert (sym->value == NULL);
7722 build_init_assign (sym, init);
7725 /* Resolution of common features of flavors variable and procedure. */
7728 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
7730 /* Constraints on deferred shape variable. */
7731 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
7733 if (sym->attr.allocatable)
7735 if (sym->attr.dimension)
7736 gfc_error ("Allocatable array '%s' at %L must have "
7737 "a deferred shape", sym->name, &sym->declared_at);
7739 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
7740 sym->name, &sym->declared_at);
7744 if (sym->attr.pointer && sym->attr.dimension)
7746 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
7747 sym->name, &sym->declared_at);
7754 if (!mp_flag && !sym->attr.allocatable
7755 && !sym->attr.pointer && !sym->attr.dummy)
7757 gfc_error ("Array '%s' at %L cannot have a deferred shape",
7758 sym->name, &sym->declared_at);
7766 /* Additional checks for symbols with flavor variable and derived
7767 type. To be called from resolve_fl_variable. */
7770 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
7772 gcc_assert (sym->ts.type == BT_DERIVED);
7774 /* Check to see if a derived type is blocked from being host
7775 associated by the presence of another class I symbol in the same
7776 namespace. 14.6.1.3 of the standard and the discussion on
7777 comp.lang.fortran. */
7778 if (sym->ns != sym->ts.derived->ns
7779 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
7782 gfc_find_symbol (sym->ts.derived->name, sym->ns, 0, &s);
7783 if (s && s->attr.flavor != FL_DERIVED)
7785 gfc_error ("The type '%s' cannot be host associated at %L "
7786 "because it is blocked by an incompatible object "
7787 "of the same name declared at %L",
7788 sym->ts.derived->name, &sym->declared_at,
7794 /* 4th constraint in section 11.3: "If an object of a type for which
7795 component-initialization is specified (R429) appears in the
7796 specification-part of a module and does not have the ALLOCATABLE
7797 or POINTER attribute, the object shall have the SAVE attribute."
7799 The check for initializers is performed with
7800 has_default_initializer because gfc_default_initializer generates
7801 a hidden default for allocatable components. */
7802 if (!(sym->value || no_init_flag) && sym->ns->proc_name
7803 && sym->ns->proc_name->attr.flavor == FL_MODULE
7804 && !sym->ns->save_all && !sym->attr.save
7805 && !sym->attr.pointer && !sym->attr.allocatable
7806 && has_default_initializer (sym->ts.derived))
7808 gfc_error("Object '%s' at %L must have the SAVE attribute for "
7809 "default initialization of a component",
7810 sym->name, &sym->declared_at);
7814 /* Assign default initializer. */
7815 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
7816 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
7818 sym->value = gfc_default_initializer (&sym->ts);
7825 /* Resolve symbols with flavor variable. */
7828 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
7830 int no_init_flag, automatic_flag;
7832 const char *auto_save_msg;
7834 auto_save_msg = "Automatic object '%s' at %L cannot have the "
7837 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7840 /* Set this flag to check that variables are parameters of all entries.
7841 This check is effected by the call to gfc_resolve_expr through
7842 is_non_constant_shape_array. */
7843 specification_expr = 1;
7845 if (sym->ns->proc_name
7846 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7847 || sym->ns->proc_name->attr.is_main_program)
7848 && !sym->attr.use_assoc
7849 && !sym->attr.allocatable
7850 && !sym->attr.pointer
7851 && is_non_constant_shape_array (sym))
7853 /* The shape of a main program or module array needs to be
7855 gfc_error ("The module or main program array '%s' at %L must "
7856 "have constant shape", sym->name, &sym->declared_at);
7857 specification_expr = 0;
7861 if (sym->ts.type == BT_CHARACTER)
7863 /* Make sure that character string variables with assumed length are
7865 e = sym->ts.cl->length;
7866 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
7868 gfc_error ("Entity with assumed character length at %L must be a "
7869 "dummy argument or a PARAMETER", &sym->declared_at);
7873 if (e && sym->attr.save && !gfc_is_constant_expr (e))
7875 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7879 if (!gfc_is_constant_expr (e)
7880 && !(e->expr_type == EXPR_VARIABLE
7881 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
7882 && sym->ns->proc_name
7883 && (sym->ns->proc_name->attr.flavor == FL_MODULE
7884 || sym->ns->proc_name->attr.is_main_program)
7885 && !sym->attr.use_assoc)
7887 gfc_error ("'%s' at %L must have constant character length "
7888 "in this context", sym->name, &sym->declared_at);
7893 if (sym->value == NULL && sym->attr.referenced)
7894 apply_default_init_local (sym); /* Try to apply a default initialization. */
7896 /* Determine if the symbol may not have an initializer. */
7897 no_init_flag = automatic_flag = 0;
7898 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
7899 || sym->attr.intrinsic || sym->attr.result)
7901 else if (sym->attr.dimension && !sym->attr.pointer
7902 && is_non_constant_shape_array (sym))
7904 no_init_flag = automatic_flag = 1;
7906 /* Also, they must not have the SAVE attribute.
7907 SAVE_IMPLICIT is checked below. */
7908 if (sym->attr.save == SAVE_EXPLICIT)
7910 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
7915 /* Ensure that any initializer is simplified. */
7917 gfc_simplify_expr (sym->value, 1);
7919 /* Reject illegal initializers. */
7920 if (!sym->mark && sym->value)
7922 if (sym->attr.allocatable)
7923 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
7924 sym->name, &sym->declared_at);
7925 else if (sym->attr.external)
7926 gfc_error ("External '%s' at %L cannot have an initializer",
7927 sym->name, &sym->declared_at);
7928 else if (sym->attr.dummy
7929 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
7930 gfc_error ("Dummy '%s' at %L cannot have an initializer",
7931 sym->name, &sym->declared_at);
7932 else if (sym->attr.intrinsic)
7933 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
7934 sym->name, &sym->declared_at);
7935 else if (sym->attr.result)
7936 gfc_error ("Function result '%s' at %L cannot have an initializer",
7937 sym->name, &sym->declared_at);
7938 else if (automatic_flag)
7939 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
7940 sym->name, &sym->declared_at);
7947 if (sym->ts.type == BT_DERIVED)
7948 return resolve_fl_variable_derived (sym, no_init_flag);
7954 /* Resolve a procedure. */
7957 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
7959 gfc_formal_arglist *arg;
7961 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
7962 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
7963 "interfaces", sym->name, &sym->declared_at);
7965 if (sym->attr.function
7966 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
7969 if (sym->ts.type == BT_CHARACTER)
7971 gfc_charlen *cl = sym->ts.cl;
7973 if (cl && cl->length && gfc_is_constant_expr (cl->length)
7974 && resolve_charlen (cl) == FAILURE)
7977 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
7979 if (sym->attr.proc == PROC_ST_FUNCTION)
7981 gfc_error ("Character-valued statement function '%s' at %L must "
7982 "have constant length", sym->name, &sym->declared_at);
7986 if (sym->attr.external && sym->formal == NULL
7987 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
7989 gfc_error ("Automatic character length function '%s' at %L must "
7990 "have an explicit interface", sym->name,
7997 /* Ensure that derived type for are not of a private type. Internal
7998 module procedures are excluded by 2.2.3.3 - i.e., they are not
7999 externally accessible and can access all the objects accessible in
8001 if (!(sym->ns->parent
8002 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8003 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8005 gfc_interface *iface;
8007 for (arg = sym->formal; arg; arg = arg->next)
8010 && arg->sym->ts.type == BT_DERIVED
8011 && !arg->sym->ts.derived->attr.use_assoc
8012 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8013 arg->sym->ts.derived->ns->default_access)
8014 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8015 "PRIVATE type and cannot be a dummy argument"
8016 " of '%s', which is PUBLIC at %L",
8017 arg->sym->name, sym->name, &sym->declared_at)
8020 /* Stop this message from recurring. */
8021 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8026 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8027 PRIVATE to the containing module. */
8028 for (iface = sym->generic; iface; iface = iface->next)
8030 for (arg = iface->sym->formal; arg; arg = arg->next)
8033 && arg->sym->ts.type == BT_DERIVED
8034 && !arg->sym->ts.derived->attr.use_assoc
8035 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8036 arg->sym->ts.derived->ns->default_access)
8037 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8038 "'%s' in PUBLIC interface '%s' at %L "
8039 "takes dummy arguments of '%s' which is "
8040 "PRIVATE", iface->sym->name, sym->name,
8041 &iface->sym->declared_at,
8042 gfc_typename (&arg->sym->ts)) == FAILURE)
8044 /* Stop this message from recurring. */
8045 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8051 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8052 PRIVATE to the containing module. */
8053 for (iface = sym->generic; iface; iface = iface->next)
8055 for (arg = iface->sym->formal; arg; arg = arg->next)
8058 && arg->sym->ts.type == BT_DERIVED
8059 && !arg->sym->ts.derived->attr.use_assoc
8060 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8061 arg->sym->ts.derived->ns->default_access)
8062 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8063 "'%s' in PUBLIC interface '%s' at %L "
8064 "takes dummy arguments of '%s' which is "
8065 "PRIVATE", iface->sym->name, sym->name,
8066 &iface->sym->declared_at,
8067 gfc_typename (&arg->sym->ts)) == FAILURE)
8069 /* Stop this message from recurring. */
8070 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8077 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8078 && !sym->attr.proc_pointer)
8080 gfc_error ("Function '%s' at %L cannot have an initializer",
8081 sym->name, &sym->declared_at);
8085 /* An external symbol may not have an initializer because it is taken to be
8086 a procedure. Exception: Procedure Pointers. */
8087 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8089 gfc_error ("External object '%s' at %L may not have an initializer",
8090 sym->name, &sym->declared_at);
8094 /* An elemental function is required to return a scalar 12.7.1 */
8095 if (sym->attr.elemental && sym->attr.function && sym->as)
8097 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8098 "result", sym->name, &sym->declared_at);
8099 /* Reset so that the error only occurs once. */
8100 sym->attr.elemental = 0;
8104 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8105 char-len-param shall not be array-valued, pointer-valued, recursive
8106 or pure. ....snip... A character value of * may only be used in the
8107 following ways: (i) Dummy arg of procedure - dummy associates with
8108 actual length; (ii) To declare a named constant; or (iii) External
8109 function - but length must be declared in calling scoping unit. */
8110 if (sym->attr.function
8111 && sym->ts.type == BT_CHARACTER
8112 && sym->ts.cl && sym->ts.cl->length == NULL)
8114 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8115 || (sym->attr.recursive) || (sym->attr.pure))
8117 if (sym->as && sym->as->rank)
8118 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8119 "array-valued", sym->name, &sym->declared_at);
8121 if (sym->attr.pointer)
8122 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8123 "pointer-valued", sym->name, &sym->declared_at);
8126 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8127 "pure", sym->name, &sym->declared_at);
8129 if (sym->attr.recursive)
8130 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8131 "recursive", sym->name, &sym->declared_at);
8136 /* Appendix B.2 of the standard. Contained functions give an
8137 error anyway. Fixed-form is likely to be F77/legacy. */
8138 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8139 gfc_notify_std (GFC_STD_F95_OBS, "CHARACTER(*) function "
8140 "'%s' at %L is obsolescent in fortran 95",
8141 sym->name, &sym->declared_at);
8144 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8146 gfc_formal_arglist *curr_arg;
8147 int has_non_interop_arg = 0;
8149 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8150 sym->common_block) == FAILURE)
8152 /* Clear these to prevent looking at them again if there was an
8154 sym->attr.is_bind_c = 0;
8155 sym->attr.is_c_interop = 0;
8156 sym->ts.is_c_interop = 0;
8160 /* So far, no errors have been found. */
8161 sym->attr.is_c_interop = 1;
8162 sym->ts.is_c_interop = 1;
8165 curr_arg = sym->formal;
8166 while (curr_arg != NULL)
8168 /* Skip implicitly typed dummy args here. */
8169 if (curr_arg->sym->attr.implicit_type == 0)
8170 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8171 /* If something is found to fail, record the fact so we
8172 can mark the symbol for the procedure as not being
8173 BIND(C) to try and prevent multiple errors being
8175 has_non_interop_arg = 1;
8177 curr_arg = curr_arg->next;
8180 /* See if any of the arguments were not interoperable and if so, clear
8181 the procedure symbol to prevent duplicate error messages. */
8182 if (has_non_interop_arg != 0)
8184 sym->attr.is_c_interop = 0;
8185 sym->ts.is_c_interop = 0;
8186 sym->attr.is_bind_c = 0;
8190 if (!sym->attr.proc_pointer)
8192 if (sym->attr.save == SAVE_EXPLICIT)
8194 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8195 "in '%s' at %L", sym->name, &sym->declared_at);
8198 if (sym->attr.intent)
8200 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8201 "in '%s' at %L", sym->name, &sym->declared_at);
8204 if (sym->attr.subroutine && sym->attr.result)
8206 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
8207 "in '%s' at %L", sym->name, &sym->declared_at);
8210 if (sym->attr.external && sym->attr.function
8211 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
8212 || sym->attr.contained))
8214 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
8215 "in '%s' at %L", sym->name, &sym->declared_at);
8218 if (strcmp ("ppr@", sym->name) == 0)
8220 gfc_error ("Procedure pointer result '%s' at %L "
8221 "is missing the pointer attribute",
8222 sym->ns->proc_name->name, &sym->declared_at);
8231 /* Resolve a list of finalizer procedures. That is, after they have hopefully
8232 been defined and we now know their defined arguments, check that they fulfill
8233 the requirements of the standard for procedures used as finalizers. */
8236 gfc_resolve_finalizers (gfc_symbol* derived)
8238 gfc_finalizer* list;
8239 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
8240 gfc_try result = SUCCESS;
8241 bool seen_scalar = false;
8243 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
8246 /* Walk over the list of finalizer-procedures, check them, and if any one
8247 does not fit in with the standard's definition, print an error and remove
8248 it from the list. */
8249 prev_link = &derived->f2k_derived->finalizers;
8250 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
8256 /* Skip this finalizer if we already resolved it. */
8257 if (list->proc_tree)
8259 prev_link = &(list->next);
8263 /* Check this exists and is a SUBROUTINE. */
8264 if (!list->proc_sym->attr.subroutine)
8266 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
8267 list->proc_sym->name, &list->where);
8271 /* We should have exactly one argument. */
8272 if (!list->proc_sym->formal || list->proc_sym->formal->next)
8274 gfc_error ("FINAL procedure at %L must have exactly one argument",
8278 arg = list->proc_sym->formal->sym;
8280 /* This argument must be of our type. */
8281 if (arg->ts.type != BT_DERIVED || arg->ts.derived != derived)
8283 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
8284 &arg->declared_at, derived->name);
8288 /* It must neither be a pointer nor allocatable nor optional. */
8289 if (arg->attr.pointer)
8291 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
8295 if (arg->attr.allocatable)
8297 gfc_error ("Argument of FINAL procedure at %L must not be"
8298 " ALLOCATABLE", &arg->declared_at);
8301 if (arg->attr.optional)
8303 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
8308 /* It must not be INTENT(OUT). */
8309 if (arg->attr.intent == INTENT_OUT)
8311 gfc_error ("Argument of FINAL procedure at %L must not be"
8312 " INTENT(OUT)", &arg->declared_at);
8316 /* Warn if the procedure is non-scalar and not assumed shape. */
8317 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
8318 && arg->as->type != AS_ASSUMED_SHAPE)
8319 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
8320 " shape argument", &arg->declared_at);
8322 /* Check that it does not match in kind and rank with a FINAL procedure
8323 defined earlier. To really loop over the *earlier* declarations,
8324 we need to walk the tail of the list as new ones were pushed at the
8326 /* TODO: Handle kind parameters once they are implemented. */
8327 my_rank = (arg->as ? arg->as->rank : 0);
8328 for (i = list->next; i; i = i->next)
8330 /* Argument list might be empty; that is an error signalled earlier,
8331 but we nevertheless continued resolving. */
8332 if (i->proc_sym->formal)
8334 gfc_symbol* i_arg = i->proc_sym->formal->sym;
8335 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
8336 if (i_rank == my_rank)
8338 gfc_error ("FINAL procedure '%s' declared at %L has the same"
8339 " rank (%d) as '%s'",
8340 list->proc_sym->name, &list->where, my_rank,
8347 /* Is this the/a scalar finalizer procedure? */
8348 if (!arg->as || arg->as->rank == 0)
8351 /* Find the symtree for this procedure. */
8352 gcc_assert (!list->proc_tree);
8353 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
8355 prev_link = &list->next;
8358 /* Remove wrong nodes immediately from the list so we don't risk any
8359 troubles in the future when they might fail later expectations. */
8363 *prev_link = list->next;
8364 gfc_free_finalizer (i);
8367 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
8368 were nodes in the list, must have been for arrays. It is surely a good
8369 idea to have a scalar version there if there's something to finalize. */
8370 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
8371 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
8372 " defined at %L, suggest also scalar one",
8373 derived->name, &derived->declared_at);
8375 /* TODO: Remove this error when finalization is finished. */
8376 gfc_error ("Finalization at %L is not yet implemented",
8377 &derived->declared_at);
8383 /* Check that it is ok for the typebound procedure proc to override the
8387 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
8390 const gfc_symbol* proc_target;
8391 const gfc_symbol* old_target;
8392 unsigned proc_pass_arg, old_pass_arg, argpos;
8393 gfc_formal_arglist* proc_formal;
8394 gfc_formal_arglist* old_formal;
8396 /* This procedure should only be called for non-GENERIC proc. */
8397 gcc_assert (!proc->n.tb->is_generic);
8399 /* If the overwritten procedure is GENERIC, this is an error. */
8400 if (old->n.tb->is_generic)
8402 gfc_error ("Can't overwrite GENERIC '%s' at %L",
8403 old->name, &proc->n.tb->where);
8407 where = proc->n.tb->where;
8408 proc_target = proc->n.tb->u.specific->n.sym;
8409 old_target = old->n.tb->u.specific->n.sym;
8411 /* Check that overridden binding is not NON_OVERRIDABLE. */
8412 if (old->n.tb->non_overridable)
8414 gfc_error ("'%s' at %L overrides a procedure binding declared"
8415 " NON_OVERRIDABLE", proc->name, &where);
8419 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
8420 if (!old->n.tb->deferred && proc->n.tb->deferred)
8422 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
8423 " non-DEFERRED binding", proc->name, &where);
8427 /* If the overridden binding is PURE, the overriding must be, too. */
8428 if (old_target->attr.pure && !proc_target->attr.pure)
8430 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
8431 proc->name, &where);
8435 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
8436 is not, the overriding must not be either. */
8437 if (old_target->attr.elemental && !proc_target->attr.elemental)
8439 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
8440 " ELEMENTAL", proc->name, &where);
8443 if (!old_target->attr.elemental && proc_target->attr.elemental)
8445 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
8446 " be ELEMENTAL, either", proc->name, &where);
8450 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
8452 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
8454 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
8455 " SUBROUTINE", proc->name, &where);
8459 /* If the overridden binding is a FUNCTION, the overriding must also be a
8460 FUNCTION and have the same characteristics. */
8461 if (old_target->attr.function)
8463 if (!proc_target->attr.function)
8465 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
8466 " FUNCTION", proc->name, &where);
8470 /* FIXME: Do more comprehensive checking (including, for instance, the
8471 rank and array-shape). */
8472 gcc_assert (proc_target->result && old_target->result);
8473 if (!gfc_compare_types (&proc_target->result->ts,
8474 &old_target->result->ts))
8476 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
8477 " matching result types", proc->name, &where);
8482 /* If the overridden binding is PUBLIC, the overriding one must not be
8484 if (old->n.tb->access == ACCESS_PUBLIC
8485 && proc->n.tb->access == ACCESS_PRIVATE)
8487 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
8488 " PRIVATE", proc->name, &where);
8492 /* Compare the formal argument lists of both procedures. This is also abused
8493 to find the position of the passed-object dummy arguments of both
8494 bindings as at least the overridden one might not yet be resolved and we
8495 need those positions in the check below. */
8496 proc_pass_arg = old_pass_arg = 0;
8497 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
8499 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
8502 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
8503 proc_formal && old_formal;
8504 proc_formal = proc_formal->next, old_formal = old_formal->next)
8506 if (proc->n.tb->pass_arg
8507 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
8508 proc_pass_arg = argpos;
8509 if (old->n.tb->pass_arg
8510 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
8511 old_pass_arg = argpos;
8513 /* Check that the names correspond. */
8514 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
8516 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
8517 " to match the corresponding argument of the overridden"
8518 " procedure", proc_formal->sym->name, proc->name, &where,
8519 old_formal->sym->name);
8523 /* Check that the types correspond if neither is the passed-object
8525 /* FIXME: Do more comprehensive testing here. */
8526 if (proc_pass_arg != argpos && old_pass_arg != argpos
8527 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
8529 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
8530 " in respect to the overridden procedure",
8531 proc_formal->sym->name, proc->name, &where);
8537 if (proc_formal || old_formal)
8539 gfc_error ("'%s' at %L must have the same number of formal arguments as"
8540 " the overridden procedure", proc->name, &where);
8544 /* If the overridden binding is NOPASS, the overriding one must also be
8546 if (old->n.tb->nopass && !proc->n.tb->nopass)
8548 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
8549 " NOPASS", proc->name, &where);
8553 /* If the overridden binding is PASS(x), the overriding one must also be
8554 PASS and the passed-object dummy arguments must correspond. */
8555 if (!old->n.tb->nopass)
8557 if (proc->n.tb->nopass)
8559 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
8560 " PASS", proc->name, &where);
8564 if (proc_pass_arg != old_pass_arg)
8566 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
8567 " the same position as the passed-object dummy argument of"
8568 " the overridden procedure", proc->name, &where);
8577 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
8580 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
8581 const char* generic_name, locus where)
8586 gcc_assert (t1->specific && t2->specific);
8587 gcc_assert (!t1->specific->is_generic);
8588 gcc_assert (!t2->specific->is_generic);
8590 sym1 = t1->specific->u.specific->n.sym;
8591 sym2 = t2->specific->u.specific->n.sym;
8593 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
8594 if (sym1->attr.subroutine != sym2->attr.subroutine
8595 || sym1->attr.function != sym2->attr.function)
8597 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
8598 " GENERIC '%s' at %L",
8599 sym1->name, sym2->name, generic_name, &where);
8603 /* Compare the interfaces. */
8604 if (gfc_compare_interfaces (sym1, sym2, 1, 0, NULL, 0))
8606 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
8607 sym1->name, sym2->name, generic_name, &where);
8615 /* Resolve a GENERIC procedure binding for a derived type. */
8618 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
8620 gfc_tbp_generic* target;
8621 gfc_symtree* first_target;
8622 gfc_symbol* super_type;
8623 gfc_symtree* inherited;
8626 gcc_assert (st->n.tb);
8627 gcc_assert (st->n.tb->is_generic);
8629 where = st->n.tb->where;
8630 super_type = gfc_get_derived_super_type (derived);
8632 /* Find the overridden binding if any. */
8633 st->n.tb->overridden = NULL;
8636 gfc_symtree* overridden;
8637 overridden = gfc_find_typebound_proc (super_type, NULL, st->name, true);
8639 if (overridden && overridden->n.tb)
8640 st->n.tb->overridden = overridden->n.tb;
8643 /* Try to find the specific bindings for the symtrees in our target-list. */
8644 gcc_assert (st->n.tb->u.generic);
8645 for (target = st->n.tb->u.generic; target; target = target->next)
8646 if (!target->specific)
8648 gfc_typebound_proc* overridden_tbp;
8650 const char* target_name;
8652 target_name = target->specific_st->name;
8654 /* Defined for this type directly. */
8655 if (target->specific_st->n.tb)
8657 target->specific = target->specific_st->n.tb;
8658 goto specific_found;
8661 /* Look for an inherited specific binding. */
8664 inherited = gfc_find_typebound_proc (super_type, NULL,
8669 gcc_assert (inherited->n.tb);
8670 target->specific = inherited->n.tb;
8671 goto specific_found;
8675 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
8676 " at %L", target_name, st->name, &where);
8679 /* Once we've found the specific binding, check it is not ambiguous with
8680 other specifics already found or inherited for the same GENERIC. */
8682 gcc_assert (target->specific);
8684 /* This must really be a specific binding! */
8685 if (target->specific->is_generic)
8687 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
8688 " '%s' is GENERIC, too", st->name, &where, target_name);
8692 /* Check those already resolved on this type directly. */
8693 for (g = st->n.tb->u.generic; g; g = g->next)
8694 if (g != target && g->specific
8695 && check_generic_tbp_ambiguity (target, g, st->name, where)
8699 /* Check for ambiguity with inherited specific targets. */
8700 for (overridden_tbp = st->n.tb->overridden; overridden_tbp;
8701 overridden_tbp = overridden_tbp->overridden)
8702 if (overridden_tbp->is_generic)
8704 for (g = overridden_tbp->u.generic; g; g = g->next)
8706 gcc_assert (g->specific);
8707 if (check_generic_tbp_ambiguity (target, g,
8708 st->name, where) == FAILURE)
8714 /* If we attempt to "overwrite" a specific binding, this is an error. */
8715 if (st->n.tb->overridden && !st->n.tb->overridden->is_generic)
8717 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
8718 " the same name", st->name, &where);
8722 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
8723 all must have the same attributes here. */
8724 first_target = st->n.tb->u.generic->specific->u.specific;
8725 gcc_assert (first_target);
8726 st->n.tb->subroutine = first_target->n.sym->attr.subroutine;
8727 st->n.tb->function = first_target->n.sym->attr.function;
8733 /* Resolve the type-bound procedures for a derived type. */
8735 static gfc_symbol* resolve_bindings_derived;
8736 static gfc_try resolve_bindings_result;
8739 resolve_typebound_procedure (gfc_symtree* stree)
8744 gfc_symbol* super_type;
8745 gfc_component* comp;
8749 /* Undefined specific symbol from GENERIC target definition. */
8753 if (stree->n.tb->error)
8756 /* If this is a GENERIC binding, use that routine. */
8757 if (stree->n.tb->is_generic)
8759 if (resolve_typebound_generic (resolve_bindings_derived, stree)
8765 /* Get the target-procedure to check it. */
8766 gcc_assert (!stree->n.tb->is_generic);
8767 gcc_assert (stree->n.tb->u.specific);
8768 proc = stree->n.tb->u.specific->n.sym;
8769 where = stree->n.tb->where;
8771 /* Default access should already be resolved from the parser. */
8772 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
8774 /* It should be a module procedure or an external procedure with explicit
8775 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
8776 if ((!proc->attr.subroutine && !proc->attr.function)
8777 || (proc->attr.proc != PROC_MODULE
8778 && proc->attr.if_source != IFSRC_IFBODY)
8779 || (proc->attr.abstract && !stree->n.tb->deferred))
8781 gfc_error ("'%s' must be a module procedure or an external procedure with"
8782 " an explicit interface at %L", proc->name, &where);
8785 stree->n.tb->subroutine = proc->attr.subroutine;
8786 stree->n.tb->function = proc->attr.function;
8788 /* Find the super-type of the current derived type. We could do this once and
8789 store in a global if speed is needed, but as long as not I believe this is
8790 more readable and clearer. */
8791 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
8793 /* If PASS, resolve and check arguments if not already resolved / loaded
8794 from a .mod file. */
8795 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
8797 if (stree->n.tb->pass_arg)
8799 gfc_formal_arglist* i;
8801 /* If an explicit passing argument name is given, walk the arg-list
8805 stree->n.tb->pass_arg_num = 1;
8806 for (i = proc->formal; i; i = i->next)
8808 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
8813 ++stree->n.tb->pass_arg_num;
8818 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
8820 proc->name, stree->n.tb->pass_arg, &where,
8821 stree->n.tb->pass_arg);
8827 /* Otherwise, take the first one; there should in fact be at least
8829 stree->n.tb->pass_arg_num = 1;
8832 gfc_error ("Procedure '%s' with PASS at %L must have at"
8833 " least one argument", proc->name, &where);
8836 me_arg = proc->formal->sym;
8839 /* Now check that the argument-type matches. */
8840 gcc_assert (me_arg);
8841 if (me_arg->ts.type != BT_DERIVED
8842 || me_arg->ts.derived != resolve_bindings_derived)
8844 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
8845 " the derived-type '%s'", me_arg->name, proc->name,
8846 me_arg->name, &where, resolve_bindings_derived->name);
8850 gfc_warning ("Polymorphic entities are not yet implemented,"
8851 " non-polymorphic passed-object dummy argument of '%s'"
8852 " at %L accepted", proc->name, &where);
8855 /* If we are extending some type, check that we don't override a procedure
8856 flagged NON_OVERRIDABLE. */
8857 stree->n.tb->overridden = NULL;
8860 gfc_symtree* overridden;
8861 overridden = gfc_find_typebound_proc (super_type, NULL,
8864 if (overridden && overridden->n.tb)
8865 stree->n.tb->overridden = overridden->n.tb;
8867 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
8871 /* See if there's a name collision with a component directly in this type. */
8872 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
8873 if (!strcmp (comp->name, stree->name))
8875 gfc_error ("Procedure '%s' at %L has the same name as a component of"
8877 stree->name, &where, resolve_bindings_derived->name);
8881 /* Try to find a name collision with an inherited component. */
8882 if (super_type && gfc_find_component (super_type, stree->name, true, true))
8884 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
8885 " component of '%s'",
8886 stree->name, &where, resolve_bindings_derived->name);
8890 stree->n.tb->error = 0;
8894 resolve_bindings_result = FAILURE;
8895 stree->n.tb->error = 1;
8899 resolve_typebound_procedures (gfc_symbol* derived)
8901 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
8904 resolve_bindings_derived = derived;
8905 resolve_bindings_result = SUCCESS;
8906 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
8907 &resolve_typebound_procedure);
8909 return resolve_bindings_result;
8913 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
8914 to give all identical derived types the same backend_decl. */
8916 add_dt_to_dt_list (gfc_symbol *derived)
8918 gfc_dt_list *dt_list;
8920 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
8921 if (derived == dt_list->derived)
8924 if (dt_list == NULL)
8926 dt_list = gfc_get_dt_list ();
8927 dt_list->next = gfc_derived_types;
8928 dt_list->derived = derived;
8929 gfc_derived_types = dt_list;
8934 /* Ensure that a derived-type is really not abstract, meaning that every
8935 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
8938 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
8943 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
8945 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
8948 if (st->n.tb && st->n.tb->deferred)
8950 gfc_symtree* overriding;
8951 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true);
8952 gcc_assert (overriding && overriding->n.tb);
8953 if (overriding->n.tb->deferred)
8955 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
8956 " '%s' is DEFERRED and not overridden",
8957 sub->name, &sub->declared_at, st->name);
8966 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
8968 /* The algorithm used here is to recursively travel up the ancestry of sub
8969 and for each ancestor-type, check all bindings. If any of them is
8970 DEFERRED, look it up starting from sub and see if the found (overriding)
8971 binding is not DEFERRED.
8972 This is not the most efficient way to do this, but it should be ok and is
8973 clearer than something sophisticated. */
8975 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
8977 /* Walk bindings of this ancestor. */
8978 if (ancestor->f2k_derived)
8981 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
8986 /* Find next ancestor type and recurse on it. */
8987 ancestor = gfc_get_derived_super_type (ancestor);
8989 return ensure_not_abstract (sub, ancestor);
8995 /* Resolve the components of a derived type. */
8998 resolve_fl_derived (gfc_symbol *sym)
9000 gfc_symbol* super_type;
9004 super_type = gfc_get_derived_super_type (sym);
9006 /* Ensure the extended type gets resolved before we do. */
9007 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9010 /* An ABSTRACT type must be extensible. */
9011 if (sym->attr.abstract && (sym->attr.is_bind_c || sym->attr.sequence))
9013 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9014 sym->name, &sym->declared_at);
9018 for (c = sym->components; c != NULL; c = c->next)
9020 if (c->attr.proc_pointer && c->ts.interface)
9022 if (c->ts.interface->attr.procedure)
9023 gfc_error ("Interface '%s', used by procedure pointer component "
9024 "'%s' at %L, is declared in a later PROCEDURE statement",
9025 c->ts.interface->name, c->name, &c->loc);
9027 /* Get the attributes from the interface (now resolved). */
9028 if (c->ts.interface->attr.if_source
9029 || c->ts.interface->attr.intrinsic)
9031 gfc_symbol *ifc = c->ts.interface;
9033 if (ifc->attr.intrinsic)
9034 resolve_intrinsic (ifc, &ifc->declared_at);
9037 c->ts = ifc->result->ts;
9040 c->ts.interface = ifc;
9041 c->attr.function = ifc->attr.function;
9042 c->attr.subroutine = ifc->attr.subroutine;
9043 gfc_copy_formal_args_ppc (c, ifc);
9045 c->attr.allocatable = ifc->attr.allocatable;
9046 c->attr.pointer = ifc->attr.pointer;
9047 c->attr.pure = ifc->attr.pure;
9048 c->attr.elemental = ifc->attr.elemental;
9049 c->attr.dimension = ifc->attr.dimension;
9050 c->attr.recursive = ifc->attr.recursive;
9051 c->attr.always_explicit = ifc->attr.always_explicit;
9052 /* Copy array spec. */
9053 c->as = gfc_copy_array_spec (ifc->as);
9057 for (i = 0; i < c->as->rank; i++)
9059 gfc_expr_replace_symbols (c->as->lower[i], c);
9060 gfc_expr_replace_symbols (c->as->upper[i], c);
9063 /* Copy char length. */
9066 c->ts.cl = gfc_get_charlen();
9067 c->ts.cl->resolved = ifc->ts.cl->resolved;
9068 c->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9069 /* TODO: gfc_expr_replace_symbols (c->ts.cl->length, c);*/
9070 /* Add charlen to namespace. */
9073 c->ts.cl->next = c->formal_ns->cl_list;
9074 c->formal_ns->cl_list = c->ts.cl;
9078 else if (c->ts.interface->name[0] != '\0')
9080 gfc_error ("Interface '%s' of procedure pointer component "
9081 "'%s' at %L must be explicit", c->ts.interface->name,
9086 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
9088 c->ts = *gfc_get_default_type (c->name, NULL);
9089 c->attr.implicit_type = 1;
9092 /* Check type-spec if this is not the parent-type component. */
9093 if ((!sym->attr.extension || c != sym->components)
9094 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
9097 /* If this type is an extension, see if this component has the same name
9098 as an inherited type-bound procedure. */
9100 && gfc_find_typebound_proc (super_type, NULL, c->name, true))
9102 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
9103 " inherited type-bound procedure",
9104 c->name, sym->name, &c->loc);
9108 if (c->ts.type == BT_CHARACTER)
9110 if (c->ts.cl->length == NULL
9111 || (resolve_charlen (c->ts.cl) == FAILURE)
9112 || !gfc_is_constant_expr (c->ts.cl->length))
9114 gfc_error ("Character length of component '%s' needs to "
9115 "be a constant specification expression at %L",
9117 c->ts.cl->length ? &c->ts.cl->length->where : &c->loc);
9122 if (c->ts.type == BT_DERIVED
9123 && sym->component_access != ACCESS_PRIVATE
9124 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9125 && !is_sym_host_assoc (c->ts.derived, sym->ns)
9126 && !c->ts.derived->attr.use_assoc
9127 && !gfc_check_access (c->ts.derived->attr.access,
9128 c->ts.derived->ns->default_access)
9129 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
9130 "is a PRIVATE type and cannot be a component of "
9131 "'%s', which is PUBLIC at %L", c->name,
9132 sym->name, &sym->declared_at) == FAILURE)
9135 if (sym->attr.sequence)
9137 if (c->ts.type == BT_DERIVED && c->ts.derived->attr.sequence == 0)
9139 gfc_error ("Component %s of SEQUENCE type declared at %L does "
9140 "not have the SEQUENCE attribute",
9141 c->ts.derived->name, &sym->declared_at);
9146 if (c->ts.type == BT_DERIVED && c->attr.pointer
9147 && c->ts.derived->components == NULL
9148 && !c->ts.derived->attr.zero_comp)
9150 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
9151 "that has not been declared", c->name, sym->name,
9156 /* Ensure that all the derived type components are put on the
9157 derived type list; even in formal namespaces, where derived type
9158 pointer components might not have been declared. */
9159 if (c->ts.type == BT_DERIVED
9161 && c->ts.derived->components
9163 && sym != c->ts.derived)
9164 add_dt_to_dt_list (c->ts.derived);
9166 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
9170 for (i = 0; i < c->as->rank; i++)
9172 if (c->as->lower[i] == NULL
9173 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
9174 || !gfc_is_constant_expr (c->as->lower[i])
9175 || c->as->upper[i] == NULL
9176 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
9177 || !gfc_is_constant_expr (c->as->upper[i]))
9179 gfc_error ("Component '%s' of '%s' at %L must have "
9180 "constant array bounds",
9181 c->name, sym->name, &c->loc);
9187 /* Resolve the type-bound procedures. */
9188 if (resolve_typebound_procedures (sym) == FAILURE)
9191 /* Resolve the finalizer procedures. */
9192 if (gfc_resolve_finalizers (sym) == FAILURE)
9195 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
9196 all DEFERRED bindings are overridden. */
9197 if (super_type && super_type->attr.abstract && !sym->attr.abstract
9198 && ensure_not_abstract (sym, super_type) == FAILURE)
9201 /* Add derived type to the derived type list. */
9202 add_dt_to_dt_list (sym);
9209 resolve_fl_namelist (gfc_symbol *sym)
9214 /* Reject PRIVATE objects in a PUBLIC namelist. */
9215 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
9217 for (nl = sym->namelist; nl; nl = nl->next)
9219 if (!nl->sym->attr.use_assoc
9220 && !is_sym_host_assoc (nl->sym, sym->ns)
9221 && !gfc_check_access(nl->sym->attr.access,
9222 nl->sym->ns->default_access))
9224 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
9225 "cannot be member of PUBLIC namelist '%s' at %L",
9226 nl->sym->name, sym->name, &sym->declared_at);
9230 /* Types with private components that came here by USE-association. */
9231 if (nl->sym->ts.type == BT_DERIVED
9232 && derived_inaccessible (nl->sym->ts.derived))
9234 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
9235 "components and cannot be member of namelist '%s' at %L",
9236 nl->sym->name, sym->name, &sym->declared_at);
9240 /* Types with private components that are defined in the same module. */
9241 if (nl->sym->ts.type == BT_DERIVED
9242 && !is_sym_host_assoc (nl->sym->ts.derived, sym->ns)
9243 && !gfc_check_access (nl->sym->ts.derived->attr.private_comp
9244 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
9245 nl->sym->ns->default_access))
9247 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
9248 "cannot be a member of PUBLIC namelist '%s' at %L",
9249 nl->sym->name, sym->name, &sym->declared_at);
9255 for (nl = sym->namelist; nl; nl = nl->next)
9257 /* Reject namelist arrays of assumed shape. */
9258 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
9259 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
9260 "must not have assumed shape in namelist "
9261 "'%s' at %L", nl->sym->name, sym->name,
9262 &sym->declared_at) == FAILURE)
9265 /* Reject namelist arrays that are not constant shape. */
9266 if (is_non_constant_shape_array (nl->sym))
9268 gfc_error ("NAMELIST array object '%s' must have constant "
9269 "shape in namelist '%s' at %L", nl->sym->name,
9270 sym->name, &sym->declared_at);
9274 /* Namelist objects cannot have allocatable or pointer components. */
9275 if (nl->sym->ts.type != BT_DERIVED)
9278 if (nl->sym->ts.derived->attr.alloc_comp)
9280 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9281 "have ALLOCATABLE components",
9282 nl->sym->name, sym->name, &sym->declared_at);
9286 if (nl->sym->ts.derived->attr.pointer_comp)
9288 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9289 "have POINTER components",
9290 nl->sym->name, sym->name, &sym->declared_at);
9296 /* 14.1.2 A module or internal procedure represent local entities
9297 of the same type as a namelist member and so are not allowed. */
9298 for (nl = sym->namelist; nl; nl = nl->next)
9300 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
9303 if (nl->sym->attr.function && nl->sym == nl->sym->result)
9304 if ((nl->sym == sym->ns->proc_name)
9306 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
9310 if (nl->sym && nl->sym->name)
9311 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
9312 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
9314 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
9315 "attribute in '%s' at %L", nlsym->name,
9326 resolve_fl_parameter (gfc_symbol *sym)
9328 /* A parameter array's shape needs to be constant. */
9330 && (sym->as->type == AS_DEFERRED
9331 || is_non_constant_shape_array (sym)))
9333 gfc_error ("Parameter array '%s' at %L cannot be automatic "
9334 "or of deferred shape", sym->name, &sym->declared_at);
9338 /* Make sure a parameter that has been implicitly typed still
9339 matches the implicit type, since PARAMETER statements can precede
9340 IMPLICIT statements. */
9341 if (sym->attr.implicit_type
9342 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
9345 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
9346 "later IMPLICIT type", sym->name, &sym->declared_at);
9350 /* Make sure the types of derived parameters are consistent. This
9351 type checking is deferred until resolution because the type may
9352 refer to a derived type from the host. */
9353 if (sym->ts.type == BT_DERIVED
9354 && !gfc_compare_types (&sym->ts, &sym->value->ts))
9356 gfc_error ("Incompatible derived type in PARAMETER at %L",
9357 &sym->value->where);
9364 /* Do anything necessary to resolve a symbol. Right now, we just
9365 assume that an otherwise unknown symbol is a variable. This sort
9366 of thing commonly happens for symbols in module. */
9369 resolve_symbol (gfc_symbol *sym)
9371 int check_constant, mp_flag;
9372 gfc_symtree *symtree;
9373 gfc_symtree *this_symtree;
9377 if (sym->attr.flavor == FL_UNKNOWN)
9380 /* If we find that a flavorless symbol is an interface in one of the
9381 parent namespaces, find its symtree in this namespace, free the
9382 symbol and set the symtree to point to the interface symbol. */
9383 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
9385 symtree = gfc_find_symtree (ns->sym_root, sym->name);
9386 if (symtree && symtree->n.sym->generic)
9388 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
9392 gfc_free_symbol (sym);
9393 symtree->n.sym->refs++;
9394 this_symtree->n.sym = symtree->n.sym;
9399 /* Otherwise give it a flavor according to such attributes as
9401 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
9402 sym->attr.flavor = FL_VARIABLE;
9405 sym->attr.flavor = FL_PROCEDURE;
9406 if (sym->attr.dimension)
9407 sym->attr.function = 1;
9411 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
9412 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
9414 if (sym->attr.procedure && sym->ts.interface
9415 && sym->attr.if_source != IFSRC_DECL)
9417 if (sym->ts.interface == sym)
9419 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
9420 "interface", sym->name, &sym->declared_at);
9423 if (sym->ts.interface->attr.procedure)
9425 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
9426 " in a later PROCEDURE statement", sym->ts.interface->name,
9427 sym->name,&sym->declared_at);
9431 /* Get the attributes from the interface (now resolved). */
9432 if (sym->ts.interface->attr.if_source
9433 || sym->ts.interface->attr.intrinsic)
9435 gfc_symbol *ifc = sym->ts.interface;
9436 resolve_symbol (ifc);
9438 if (ifc->attr.intrinsic)
9439 resolve_intrinsic (ifc, &ifc->declared_at);
9442 sym->ts = ifc->result->ts;
9445 sym->ts.interface = ifc;
9446 sym->attr.function = ifc->attr.function;
9447 sym->attr.subroutine = ifc->attr.subroutine;
9448 gfc_copy_formal_args (sym, ifc);
9450 sym->attr.allocatable = ifc->attr.allocatable;
9451 sym->attr.pointer = ifc->attr.pointer;
9452 sym->attr.pure = ifc->attr.pure;
9453 sym->attr.elemental = ifc->attr.elemental;
9454 sym->attr.dimension = ifc->attr.dimension;
9455 sym->attr.recursive = ifc->attr.recursive;
9456 sym->attr.always_explicit = ifc->attr.always_explicit;
9457 /* Copy array spec. */
9458 sym->as = gfc_copy_array_spec (ifc->as);
9462 for (i = 0; i < sym->as->rank; i++)
9464 gfc_expr_replace_symbols (sym->as->lower[i], sym);
9465 gfc_expr_replace_symbols (sym->as->upper[i], sym);
9468 /* Copy char length. */
9471 sym->ts.cl = gfc_get_charlen();
9472 sym->ts.cl->resolved = ifc->ts.cl->resolved;
9473 sym->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9474 gfc_expr_replace_symbols (sym->ts.cl->length, sym);
9475 /* Add charlen to namespace. */
9478 sym->ts.cl->next = sym->formal_ns->cl_list;
9479 sym->formal_ns->cl_list = sym->ts.cl;
9483 else if (sym->ts.interface->name[0] != '\0')
9485 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
9486 sym->ts.interface->name, sym->name, &sym->declared_at);
9491 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
9494 /* Symbols that are module procedures with results (functions) have
9495 the types and array specification copied for type checking in
9496 procedures that call them, as well as for saving to a module
9497 file. These symbols can't stand the scrutiny that their results
9499 mp_flag = (sym->result != NULL && sym->result != sym);
9502 /* Make sure that the intrinsic is consistent with its internal
9503 representation. This needs to be done before assigning a default
9504 type to avoid spurious warnings. */
9505 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic)
9507 gfc_intrinsic_sym* isym;
9510 /* We already know this one is an intrinsic, so we don't call
9511 gfc_is_intrinsic for full checking but rather use gfc_find_function and
9512 gfc_find_subroutine directly to check whether it is a function or
9515 if ((isym = gfc_find_function (sym->name)))
9517 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
9518 && !sym->attr.implicit_type)
9519 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
9520 " ignored", sym->name, &sym->declared_at);
9522 else if ((isym = gfc_find_subroutine (sym->name)))
9524 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
9526 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
9527 " specifier", sym->name, &sym->declared_at);
9533 gfc_error ("'%s' declared INTRINSIC at %L does not exist",
9534 sym->name, &sym->declared_at);
9538 /* Check it is actually available in the standard settings. */
9539 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
9542 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
9543 " available in the current standard settings but %s. Use"
9544 " an appropriate -std=* option or enable -fall-intrinsics"
9545 " in order to use it.",
9546 sym->name, &sym->declared_at, symstd);
9551 /* Assign default type to symbols that need one and don't have one. */
9552 if (sym->ts.type == BT_UNKNOWN)
9554 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
9555 gfc_set_default_type (sym, 1, NULL);
9557 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
9558 && !sym->attr.function && !sym->attr.subroutine
9559 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
9560 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
9562 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
9564 /* The specific case of an external procedure should emit an error
9565 in the case that there is no implicit type. */
9567 gfc_set_default_type (sym, sym->attr.external, NULL);
9570 /* Result may be in another namespace. */
9571 resolve_symbol (sym->result);
9573 if (!sym->result->attr.proc_pointer)
9575 sym->ts = sym->result->ts;
9576 sym->as = gfc_copy_array_spec (sym->result->as);
9577 sym->attr.dimension = sym->result->attr.dimension;
9578 sym->attr.pointer = sym->result->attr.pointer;
9579 sym->attr.allocatable = sym->result->attr.allocatable;
9585 /* Assumed size arrays and assumed shape arrays must be dummy
9589 && (sym->as->type == AS_ASSUMED_SIZE
9590 || sym->as->type == AS_ASSUMED_SHAPE)
9591 && sym->attr.dummy == 0)
9593 if (sym->as->type == AS_ASSUMED_SIZE)
9594 gfc_error ("Assumed size array at %L must be a dummy argument",
9597 gfc_error ("Assumed shape array at %L must be a dummy argument",
9602 /* Make sure symbols with known intent or optional are really dummy
9603 variable. Because of ENTRY statement, this has to be deferred
9604 until resolution time. */
9606 if (!sym->attr.dummy
9607 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
9609 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
9613 if (sym->attr.value && !sym->attr.dummy)
9615 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
9616 "it is not a dummy argument", sym->name, &sym->declared_at);
9620 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
9622 gfc_charlen *cl = sym->ts.cl;
9623 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9625 gfc_error ("Character dummy variable '%s' at %L with VALUE "
9626 "attribute must have constant length",
9627 sym->name, &sym->declared_at);
9631 if (sym->ts.is_c_interop
9632 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
9634 gfc_error ("C interoperable character dummy variable '%s' at %L "
9635 "with VALUE attribute must have length one",
9636 sym->name, &sym->declared_at);
9641 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
9642 do this for something that was implicitly typed because that is handled
9643 in gfc_set_default_type. Handle dummy arguments and procedure
9644 definitions separately. Also, anything that is use associated is not
9645 handled here but instead is handled in the module it is declared in.
9646 Finally, derived type definitions are allowed to be BIND(C) since that
9647 only implies that they're interoperable, and they are checked fully for
9648 interoperability when a variable is declared of that type. */
9649 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
9650 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
9651 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
9653 gfc_try t = SUCCESS;
9655 /* First, make sure the variable is declared at the
9656 module-level scope (J3/04-007, Section 15.3). */
9657 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
9658 sym->attr.in_common == 0)
9660 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
9661 "is neither a COMMON block nor declared at the "
9662 "module level scope", sym->name, &(sym->declared_at));
9665 else if (sym->common_head != NULL)
9667 t = verify_com_block_vars_c_interop (sym->common_head);
9671 /* If type() declaration, we need to verify that the components
9672 of the given type are all C interoperable, etc. */
9673 if (sym->ts.type == BT_DERIVED &&
9674 sym->ts.derived->attr.is_c_interop != 1)
9676 /* Make sure the user marked the derived type as BIND(C). If
9677 not, call the verify routine. This could print an error
9678 for the derived type more than once if multiple variables
9679 of that type are declared. */
9680 if (sym->ts.derived->attr.is_bind_c != 1)
9681 verify_bind_c_derived_type (sym->ts.derived);
9685 /* Verify the variable itself as C interoperable if it
9686 is BIND(C). It is not possible for this to succeed if
9687 the verify_bind_c_derived_type failed, so don't have to handle
9688 any error returned by verify_bind_c_derived_type. */
9689 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9695 /* clear the is_bind_c flag to prevent reporting errors more than
9696 once if something failed. */
9697 sym->attr.is_bind_c = 0;
9702 /* If a derived type symbol has reached this point, without its
9703 type being declared, we have an error. Notice that most
9704 conditions that produce undefined derived types have already
9705 been dealt with. However, the likes of:
9706 implicit type(t) (t) ..... call foo (t) will get us here if
9707 the type is not declared in the scope of the implicit
9708 statement. Change the type to BT_UNKNOWN, both because it is so
9709 and to prevent an ICE. */
9710 if (sym->ts.type == BT_DERIVED && sym->ts.derived->components == NULL
9711 && !sym->ts.derived->attr.zero_comp)
9713 gfc_error ("The derived type '%s' at %L is of type '%s', "
9714 "which has not been defined", sym->name,
9715 &sym->declared_at, sym->ts.derived->name);
9716 sym->ts.type = BT_UNKNOWN;
9720 /* Make sure that the derived type has been resolved and that the
9721 derived type is visible in the symbol's namespace, if it is a
9722 module function and is not PRIVATE. */
9723 if (sym->ts.type == BT_DERIVED
9724 && sym->ts.derived->attr.use_assoc
9725 && sym->ns->proc_name
9726 && sym->ns->proc_name->attr.flavor == FL_MODULE)
9730 if (resolve_fl_derived (sym->ts.derived) == FAILURE)
9733 gfc_find_symbol (sym->ts.derived->name, sym->ns, 1, &ds);
9734 if (!ds && sym->attr.function
9735 && gfc_check_access (sym->attr.access, sym->ns->default_access))
9737 symtree = gfc_new_symtree (&sym->ns->sym_root,
9738 sym->ts.derived->name);
9739 symtree->n.sym = sym->ts.derived;
9740 sym->ts.derived->refs++;
9744 /* Unless the derived-type declaration is use associated, Fortran 95
9745 does not allow public entries of private derived types.
9746 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
9748 if (sym->ts.type == BT_DERIVED
9749 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
9750 && !sym->ts.derived->attr.use_assoc
9751 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9752 && !gfc_check_access (sym->ts.derived->attr.access,
9753 sym->ts.derived->ns->default_access)
9754 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
9755 "of PRIVATE derived type '%s'",
9756 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
9757 : "variable", sym->name, &sym->declared_at,
9758 sym->ts.derived->name) == FAILURE)
9761 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
9762 default initialization is defined (5.1.2.4.4). */
9763 if (sym->ts.type == BT_DERIVED
9765 && sym->attr.intent == INTENT_OUT
9767 && sym->as->type == AS_ASSUMED_SIZE)
9769 for (c = sym->ts.derived->components; c; c = c->next)
9773 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
9774 "ASSUMED SIZE and so cannot have a default initializer",
9775 sym->name, &sym->declared_at);
9781 switch (sym->attr.flavor)
9784 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
9789 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
9794 if (resolve_fl_namelist (sym) == FAILURE)
9799 if (resolve_fl_parameter (sym) == FAILURE)
9807 /* Resolve array specifier. Check as well some constraints
9808 on COMMON blocks. */
9810 check_constant = sym->attr.in_common && !sym->attr.pointer;
9812 /* Set the formal_arg_flag so that check_conflict will not throw
9813 an error for host associated variables in the specification
9814 expression for an array_valued function. */
9815 if (sym->attr.function && sym->as)
9816 formal_arg_flag = 1;
9818 gfc_resolve_array_spec (sym->as, check_constant);
9820 formal_arg_flag = 0;
9822 /* Resolve formal namespaces. */
9823 if (sym->formal_ns && sym->formal_ns != gfc_current_ns)
9824 gfc_resolve (sym->formal_ns);
9826 /* Check threadprivate restrictions. */
9827 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
9828 && (!sym->attr.in_common
9829 && sym->module == NULL
9830 && (sym->ns->proc_name == NULL
9831 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
9832 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
9834 /* If we have come this far we can apply default-initializers, as
9835 described in 14.7.5, to those variables that have not already
9836 been assigned one. */
9837 if (sym->ts.type == BT_DERIVED
9838 && sym->attr.referenced
9839 && sym->ns == gfc_current_ns
9841 && !sym->attr.allocatable
9842 && !sym->attr.alloc_comp)
9844 symbol_attribute *a = &sym->attr;
9846 if ((!a->save && !a->dummy && !a->pointer
9847 && !a->in_common && !a->use_assoc
9848 && !(a->function && sym != sym->result))
9849 || (a->dummy && a->intent == INTENT_OUT))
9850 apply_default_init (sym);
9853 /* If this symbol has a type-spec, check it. */
9854 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
9855 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
9856 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
9862 /************* Resolve DATA statements *************/
9866 gfc_data_value *vnode;
9872 /* Advance the values structure to point to the next value in the data list. */
9875 next_data_value (void)
9877 while (mpz_cmp_ui (values.left, 0) == 0)
9879 if (!gfc_is_constant_expr (values.vnode->expr))
9880 gfc_error ("non-constant DATA value at %L",
9881 &values.vnode->expr->where);
9883 if (values.vnode->next == NULL)
9886 values.vnode = values.vnode->next;
9887 mpz_set (values.left, values.vnode->repeat);
9895 check_data_variable (gfc_data_variable *var, locus *where)
9901 ar_type mark = AR_UNKNOWN;
9903 mpz_t section_index[GFC_MAX_DIMENSIONS];
9909 if (gfc_resolve_expr (var->expr) == FAILURE)
9913 mpz_init_set_si (offset, 0);
9916 if (e->expr_type != EXPR_VARIABLE)
9917 gfc_internal_error ("check_data_variable(): Bad expression");
9919 sym = e->symtree->n.sym;
9921 if (sym->ns->is_block_data && !sym->attr.in_common)
9923 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
9924 sym->name, &sym->declared_at);
9927 if (e->ref == NULL && sym->as)
9929 gfc_error ("DATA array '%s' at %L must be specified in a previous"
9930 " declaration", sym->name, where);
9934 has_pointer = sym->attr.pointer;
9936 for (ref = e->ref; ref; ref = ref->next)
9938 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
9942 && ref->type == REF_ARRAY
9943 && ref->u.ar.type != AR_FULL)
9945 gfc_error ("DATA element '%s' at %L is a pointer and so must "
9946 "be a full array", sym->name, where);
9951 if (e->rank == 0 || has_pointer)
9953 mpz_init_set_ui (size, 1);
9960 /* Find the array section reference. */
9961 for (ref = e->ref; ref; ref = ref->next)
9963 if (ref->type != REF_ARRAY)
9965 if (ref->u.ar.type == AR_ELEMENT)
9971 /* Set marks according to the reference pattern. */
9972 switch (ref->u.ar.type)
9980 /* Get the start position of array section. */
9981 gfc_get_section_index (ar, section_index, &offset);
9989 if (gfc_array_size (e, &size) == FAILURE)
9991 gfc_error ("Nonconstant array section at %L in DATA statement",
10000 while (mpz_cmp_ui (size, 0) > 0)
10002 if (next_data_value () == FAILURE)
10004 gfc_error ("DATA statement at %L has more variables than values",
10010 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
10014 /* If we have more than one element left in the repeat count,
10015 and we have more than one element left in the target variable,
10016 then create a range assignment. */
10017 /* FIXME: Only done for full arrays for now, since array sections
10019 if (mark == AR_FULL && ref && ref->next == NULL
10020 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
10024 if (mpz_cmp (size, values.left) >= 0)
10026 mpz_init_set (range, values.left);
10027 mpz_sub (size, size, values.left);
10028 mpz_set_ui (values.left, 0);
10032 mpz_init_set (range, size);
10033 mpz_sub (values.left, values.left, size);
10034 mpz_set_ui (size, 0);
10037 gfc_assign_data_value_range (var->expr, values.vnode->expr,
10040 mpz_add (offset, offset, range);
10044 /* Assign initial value to symbol. */
10047 mpz_sub_ui (values.left, values.left, 1);
10048 mpz_sub_ui (size, size, 1);
10050 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
10054 if (mark == AR_FULL)
10055 mpz_add_ui (offset, offset, 1);
10057 /* Modify the array section indexes and recalculate the offset
10058 for next element. */
10059 else if (mark == AR_SECTION)
10060 gfc_advance_section (section_index, ar, &offset);
10064 if (mark == AR_SECTION)
10066 for (i = 0; i < ar->dimen; i++)
10067 mpz_clear (section_index[i]);
10071 mpz_clear (offset);
10077 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
10079 /* Iterate over a list of elements in a DATA statement. */
10082 traverse_data_list (gfc_data_variable *var, locus *where)
10085 iterator_stack frame;
10086 gfc_expr *e, *start, *end, *step;
10087 gfc_try retval = SUCCESS;
10089 mpz_init (frame.value);
10091 start = gfc_copy_expr (var->iter.start);
10092 end = gfc_copy_expr (var->iter.end);
10093 step = gfc_copy_expr (var->iter.step);
10095 if (gfc_simplify_expr (start, 1) == FAILURE
10096 || start->expr_type != EXPR_CONSTANT)
10098 gfc_error ("iterator start at %L does not simplify", &start->where);
10102 if (gfc_simplify_expr (end, 1) == FAILURE
10103 || end->expr_type != EXPR_CONSTANT)
10105 gfc_error ("iterator end at %L does not simplify", &end->where);
10109 if (gfc_simplify_expr (step, 1) == FAILURE
10110 || step->expr_type != EXPR_CONSTANT)
10112 gfc_error ("iterator step at %L does not simplify", &step->where);
10117 mpz_init_set (trip, end->value.integer);
10118 mpz_sub (trip, trip, start->value.integer);
10119 mpz_add (trip, trip, step->value.integer);
10121 mpz_div (trip, trip, step->value.integer);
10123 mpz_set (frame.value, start->value.integer);
10125 frame.prev = iter_stack;
10126 frame.variable = var->iter.var->symtree;
10127 iter_stack = &frame;
10129 while (mpz_cmp_ui (trip, 0) > 0)
10131 if (traverse_data_var (var->list, where) == FAILURE)
10138 e = gfc_copy_expr (var->expr);
10139 if (gfc_simplify_expr (e, 1) == FAILURE)
10147 mpz_add (frame.value, frame.value, step->value.integer);
10149 mpz_sub_ui (trip, trip, 1);
10154 mpz_clear (frame.value);
10156 gfc_free_expr (start);
10157 gfc_free_expr (end);
10158 gfc_free_expr (step);
10160 iter_stack = frame.prev;
10165 /* Type resolve variables in the variable list of a DATA statement. */
10168 traverse_data_var (gfc_data_variable *var, locus *where)
10172 for (; var; var = var->next)
10174 if (var->expr == NULL)
10175 t = traverse_data_list (var, where);
10177 t = check_data_variable (var, where);
10187 /* Resolve the expressions and iterators associated with a data statement.
10188 This is separate from the assignment checking because data lists should
10189 only be resolved once. */
10192 resolve_data_variables (gfc_data_variable *d)
10194 for (; d; d = d->next)
10196 if (d->list == NULL)
10198 if (gfc_resolve_expr (d->expr) == FAILURE)
10203 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
10206 if (resolve_data_variables (d->list) == FAILURE)
10215 /* Resolve a single DATA statement. We implement this by storing a pointer to
10216 the value list into static variables, and then recursively traversing the
10217 variables list, expanding iterators and such. */
10220 resolve_data (gfc_data *d)
10223 if (resolve_data_variables (d->var) == FAILURE)
10226 values.vnode = d->value;
10227 if (d->value == NULL)
10228 mpz_set_ui (values.left, 0);
10230 mpz_set (values.left, d->value->repeat);
10232 if (traverse_data_var (d->var, &d->where) == FAILURE)
10235 /* At this point, we better not have any values left. */
10237 if (next_data_value () == SUCCESS)
10238 gfc_error ("DATA statement at %L has more values than variables",
10243 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
10244 accessed by host or use association, is a dummy argument to a pure function,
10245 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
10246 is storage associated with any such variable, shall not be used in the
10247 following contexts: (clients of this function). */
10249 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
10250 procedure. Returns zero if assignment is OK, nonzero if there is a
10253 gfc_impure_variable (gfc_symbol *sym)
10257 if (sym->attr.use_assoc || sym->attr.in_common)
10260 if (sym->ns != gfc_current_ns)
10261 return !sym->attr.function;
10263 proc = sym->ns->proc_name;
10264 if (sym->attr.dummy && gfc_pure (proc)
10265 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
10267 proc->attr.function))
10270 /* TODO: Sort out what can be storage associated, if anything, and include
10271 it here. In principle equivalences should be scanned but it does not
10272 seem to be possible to storage associate an impure variable this way. */
10277 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
10278 symbol of the current procedure. */
10281 gfc_pure (gfc_symbol *sym)
10283 symbol_attribute attr;
10286 sym = gfc_current_ns->proc_name;
10292 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
10296 /* Test whether the current procedure is elemental or not. */
10299 gfc_elemental (gfc_symbol *sym)
10301 symbol_attribute attr;
10304 sym = gfc_current_ns->proc_name;
10309 return attr.flavor == FL_PROCEDURE && attr.elemental;
10313 /* Warn about unused labels. */
10316 warn_unused_fortran_label (gfc_st_label *label)
10321 warn_unused_fortran_label (label->left);
10323 if (label->defined == ST_LABEL_UNKNOWN)
10326 switch (label->referenced)
10328 case ST_LABEL_UNKNOWN:
10329 gfc_warning ("Label %d at %L defined but not used", label->value,
10333 case ST_LABEL_BAD_TARGET:
10334 gfc_warning ("Label %d at %L defined but cannot be used",
10335 label->value, &label->where);
10342 warn_unused_fortran_label (label->right);
10346 /* Returns the sequence type of a symbol or sequence. */
10349 sequence_type (gfc_typespec ts)
10358 if (ts.derived->components == NULL)
10359 return SEQ_NONDEFAULT;
10361 result = sequence_type (ts.derived->components->ts);
10362 for (c = ts.derived->components->next; c; c = c->next)
10363 if (sequence_type (c->ts) != result)
10369 if (ts.kind != gfc_default_character_kind)
10370 return SEQ_NONDEFAULT;
10372 return SEQ_CHARACTER;
10375 if (ts.kind != gfc_default_integer_kind)
10376 return SEQ_NONDEFAULT;
10378 return SEQ_NUMERIC;
10381 if (!(ts.kind == gfc_default_real_kind
10382 || ts.kind == gfc_default_double_kind))
10383 return SEQ_NONDEFAULT;
10385 return SEQ_NUMERIC;
10388 if (ts.kind != gfc_default_complex_kind)
10389 return SEQ_NONDEFAULT;
10391 return SEQ_NUMERIC;
10394 if (ts.kind != gfc_default_logical_kind)
10395 return SEQ_NONDEFAULT;
10397 return SEQ_NUMERIC;
10400 return SEQ_NONDEFAULT;
10405 /* Resolve derived type EQUIVALENCE object. */
10408 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
10411 gfc_component *c = derived->components;
10416 /* Shall not be an object of nonsequence derived type. */
10417 if (!derived->attr.sequence)
10419 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
10420 "attribute to be an EQUIVALENCE object", sym->name,
10425 /* Shall not have allocatable components. */
10426 if (derived->attr.alloc_comp)
10428 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
10429 "components to be an EQUIVALENCE object",sym->name,
10434 if (sym->attr.in_common && has_default_initializer (sym->ts.derived))
10436 gfc_error ("Derived type variable '%s' at %L with default "
10437 "initialization cannot be in EQUIVALENCE with a variable "
10438 "in COMMON", sym->name, &e->where);
10442 for (; c ; c = c->next)
10446 && (resolve_equivalence_derived (c->ts.derived, sym, e) == FAILURE))
10449 /* Shall not be an object of sequence derived type containing a pointer
10450 in the structure. */
10451 if (c->attr.pointer)
10453 gfc_error ("Derived type variable '%s' at %L with pointer "
10454 "component(s) cannot be an EQUIVALENCE object",
10455 sym->name, &e->where);
10463 /* Resolve equivalence object.
10464 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
10465 an allocatable array, an object of nonsequence derived type, an object of
10466 sequence derived type containing a pointer at any level of component
10467 selection, an automatic object, a function name, an entry name, a result
10468 name, a named constant, a structure component, or a subobject of any of
10469 the preceding objects. A substring shall not have length zero. A
10470 derived type shall not have components with default initialization nor
10471 shall two objects of an equivalence group be initialized.
10472 Either all or none of the objects shall have an protected attribute.
10473 The simple constraints are done in symbol.c(check_conflict) and the rest
10474 are implemented here. */
10477 resolve_equivalence (gfc_equiv *eq)
10480 gfc_symbol *derived;
10481 gfc_symbol *first_sym;
10484 locus *last_where = NULL;
10485 seq_type eq_type, last_eq_type;
10486 gfc_typespec *last_ts;
10487 int object, cnt_protected;
10488 const char *value_name;
10492 last_ts = &eq->expr->symtree->n.sym->ts;
10494 first_sym = eq->expr->symtree->n.sym;
10498 for (object = 1; eq; eq = eq->eq, object++)
10502 e->ts = e->symtree->n.sym->ts;
10503 /* match_varspec might not know yet if it is seeing
10504 array reference or substring reference, as it doesn't
10506 if (e->ref && e->ref->type == REF_ARRAY)
10508 gfc_ref *ref = e->ref;
10509 sym = e->symtree->n.sym;
10511 if (sym->attr.dimension)
10513 ref->u.ar.as = sym->as;
10517 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
10518 if (e->ts.type == BT_CHARACTER
10520 && ref->type == REF_ARRAY
10521 && ref->u.ar.dimen == 1
10522 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
10523 && ref->u.ar.stride[0] == NULL)
10525 gfc_expr *start = ref->u.ar.start[0];
10526 gfc_expr *end = ref->u.ar.end[0];
10529 /* Optimize away the (:) reference. */
10530 if (start == NULL && end == NULL)
10533 e->ref = ref->next;
10535 e->ref->next = ref->next;
10540 ref->type = REF_SUBSTRING;
10542 start = gfc_int_expr (1);
10543 ref->u.ss.start = start;
10544 if (end == NULL && e->ts.cl)
10545 end = gfc_copy_expr (e->ts.cl->length);
10546 ref->u.ss.end = end;
10547 ref->u.ss.length = e->ts.cl;
10554 /* Any further ref is an error. */
10557 gcc_assert (ref->type == REF_ARRAY);
10558 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
10564 if (gfc_resolve_expr (e) == FAILURE)
10567 sym = e->symtree->n.sym;
10569 if (sym->attr.is_protected)
10571 if (cnt_protected > 0 && cnt_protected != object)
10573 gfc_error ("Either all or none of the objects in the "
10574 "EQUIVALENCE set at %L shall have the "
10575 "PROTECTED attribute",
10580 /* Shall not equivalence common block variables in a PURE procedure. */
10581 if (sym->ns->proc_name
10582 && sym->ns->proc_name->attr.pure
10583 && sym->attr.in_common)
10585 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
10586 "object in the pure procedure '%s'",
10587 sym->name, &e->where, sym->ns->proc_name->name);
10591 /* Shall not be a named constant. */
10592 if (e->expr_type == EXPR_CONSTANT)
10594 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
10595 "object", sym->name, &e->where);
10599 derived = e->ts.derived;
10600 if (derived && resolve_equivalence_derived (derived, sym, e) == FAILURE)
10603 /* Check that the types correspond correctly:
10605 A numeric sequence structure may be equivalenced to another sequence
10606 structure, an object of default integer type, default real type, double
10607 precision real type, default logical type such that components of the
10608 structure ultimately only become associated to objects of the same
10609 kind. A character sequence structure may be equivalenced to an object
10610 of default character kind or another character sequence structure.
10611 Other objects may be equivalenced only to objects of the same type and
10612 kind parameters. */
10614 /* Identical types are unconditionally OK. */
10615 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
10616 goto identical_types;
10618 last_eq_type = sequence_type (*last_ts);
10619 eq_type = sequence_type (sym->ts);
10621 /* Since the pair of objects is not of the same type, mixed or
10622 non-default sequences can be rejected. */
10624 msg = "Sequence %s with mixed components in EQUIVALENCE "
10625 "statement at %L with different type objects";
10627 && last_eq_type == SEQ_MIXED
10628 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
10630 || (eq_type == SEQ_MIXED
10631 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10632 &e->where) == FAILURE))
10635 msg = "Non-default type object or sequence %s in EQUIVALENCE "
10636 "statement at %L with objects of different type";
10638 && last_eq_type == SEQ_NONDEFAULT
10639 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
10640 last_where) == FAILURE)
10641 || (eq_type == SEQ_NONDEFAULT
10642 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10643 &e->where) == FAILURE))
10646 msg ="Non-CHARACTER object '%s' in default CHARACTER "
10647 "EQUIVALENCE statement at %L";
10648 if (last_eq_type == SEQ_CHARACTER
10649 && eq_type != SEQ_CHARACTER
10650 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10651 &e->where) == FAILURE)
10654 msg ="Non-NUMERIC object '%s' in default NUMERIC "
10655 "EQUIVALENCE statement at %L";
10656 if (last_eq_type == SEQ_NUMERIC
10657 && eq_type != SEQ_NUMERIC
10658 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
10659 &e->where) == FAILURE)
10664 last_where = &e->where;
10669 /* Shall not be an automatic array. */
10670 if (e->ref->type == REF_ARRAY
10671 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
10673 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
10674 "an EQUIVALENCE object", sym->name, &e->where);
10681 /* Shall not be a structure component. */
10682 if (r->type == REF_COMPONENT)
10684 gfc_error ("Structure component '%s' at %L cannot be an "
10685 "EQUIVALENCE object",
10686 r->u.c.component->name, &e->where);
10690 /* A substring shall not have length zero. */
10691 if (r->type == REF_SUBSTRING)
10693 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
10695 gfc_error ("Substring at %L has length zero",
10696 &r->u.ss.start->where);
10706 /* Resolve function and ENTRY types, issue diagnostics if needed. */
10709 resolve_fntype (gfc_namespace *ns)
10711 gfc_entry_list *el;
10714 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
10717 /* If there are any entries, ns->proc_name is the entry master
10718 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
10720 sym = ns->entries->sym;
10722 sym = ns->proc_name;
10723 if (sym->result == sym
10724 && sym->ts.type == BT_UNKNOWN
10725 && gfc_set_default_type (sym, 0, NULL) == FAILURE
10726 && !sym->attr.untyped)
10728 gfc_error ("Function '%s' at %L has no IMPLICIT type",
10729 sym->name, &sym->declared_at);
10730 sym->attr.untyped = 1;
10733 if (sym->ts.type == BT_DERIVED && !sym->ts.derived->attr.use_assoc
10734 && !sym->attr.contained
10735 && !gfc_check_access (sym->ts.derived->attr.access,
10736 sym->ts.derived->ns->default_access)
10737 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10739 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
10740 "%L of PRIVATE type '%s'", sym->name,
10741 &sym->declared_at, sym->ts.derived->name);
10745 for (el = ns->entries->next; el; el = el->next)
10747 if (el->sym->result == el->sym
10748 && el->sym->ts.type == BT_UNKNOWN
10749 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
10750 && !el->sym->attr.untyped)
10752 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
10753 el->sym->name, &el->sym->declared_at);
10754 el->sym->attr.untyped = 1;
10759 /* 12.3.2.1.1 Defined operators. */
10762 gfc_resolve_uops (gfc_symtree *symtree)
10764 gfc_interface *itr;
10766 gfc_formal_arglist *formal;
10768 if (symtree == NULL)
10771 gfc_resolve_uops (symtree->left);
10772 gfc_resolve_uops (symtree->right);
10774 for (itr = symtree->n.uop->op; itr; itr = itr->next)
10777 if (!sym->attr.function)
10778 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
10779 sym->name, &sym->declared_at);
10781 if (sym->ts.type == BT_CHARACTER
10782 && !(sym->ts.cl && sym->ts.cl->length)
10783 && !(sym->result && sym->result->ts.cl
10784 && sym->result->ts.cl->length))
10785 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
10786 "character length", sym->name, &sym->declared_at);
10788 formal = sym->formal;
10789 if (!formal || !formal->sym)
10791 gfc_error ("User operator procedure '%s' at %L must have at least "
10792 "one argument", sym->name, &sym->declared_at);
10796 if (formal->sym->attr.intent != INTENT_IN)
10797 gfc_error ("First argument of operator interface at %L must be "
10798 "INTENT(IN)", &sym->declared_at);
10800 if (formal->sym->attr.optional)
10801 gfc_error ("First argument of operator interface at %L cannot be "
10802 "optional", &sym->declared_at);
10804 formal = formal->next;
10805 if (!formal || !formal->sym)
10808 if (formal->sym->attr.intent != INTENT_IN)
10809 gfc_error ("Second argument of operator interface at %L must be "
10810 "INTENT(IN)", &sym->declared_at);
10812 if (formal->sym->attr.optional)
10813 gfc_error ("Second argument of operator interface at %L cannot be "
10814 "optional", &sym->declared_at);
10817 gfc_error ("Operator interface at %L must have, at most, two "
10818 "arguments", &sym->declared_at);
10823 /* Examine all of the expressions associated with a program unit,
10824 assign types to all intermediate expressions, make sure that all
10825 assignments are to compatible types and figure out which names
10826 refer to which functions or subroutines. It doesn't check code
10827 block, which is handled by resolve_code. */
10830 resolve_types (gfc_namespace *ns)
10836 gfc_namespace* old_ns = gfc_current_ns;
10838 /* Check that all IMPLICIT types are ok. */
10839 if (!ns->seen_implicit_none)
10842 for (letter = 0; letter != GFC_LETTERS; ++letter)
10843 if (ns->set_flag[letter]
10844 && resolve_typespec_used (&ns->default_type[letter],
10845 &ns->implicit_loc[letter],
10850 gfc_current_ns = ns;
10852 resolve_entries (ns);
10854 resolve_common_vars (ns->blank_common.head, false);
10855 resolve_common_blocks (ns->common_root);
10857 resolve_contained_functions (ns);
10859 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
10861 for (cl = ns->cl_list; cl; cl = cl->next)
10862 resolve_charlen (cl);
10864 gfc_traverse_ns (ns, resolve_symbol);
10866 resolve_fntype (ns);
10868 for (n = ns->contained; n; n = n->sibling)
10870 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
10871 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
10872 "also be PURE", n->proc_name->name,
10873 &n->proc_name->declared_at);
10879 gfc_check_interfaces (ns);
10881 gfc_traverse_ns (ns, resolve_values);
10887 for (d = ns->data; d; d = d->next)
10891 gfc_traverse_ns (ns, gfc_formalize_init_value);
10893 gfc_traverse_ns (ns, gfc_verify_binding_labels);
10895 if (ns->common_root != NULL)
10896 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
10898 for (eq = ns->equiv; eq; eq = eq->next)
10899 resolve_equivalence (eq);
10901 /* Warn about unused labels. */
10902 if (warn_unused_label)
10903 warn_unused_fortran_label (ns->st_labels);
10905 gfc_resolve_uops (ns->uop_root);
10907 gfc_current_ns = old_ns;
10911 /* Call resolve_code recursively. */
10914 resolve_codes (gfc_namespace *ns)
10917 bitmap_obstack old_obstack;
10919 for (n = ns->contained; n; n = n->sibling)
10922 gfc_current_ns = ns;
10924 /* Set to an out of range value. */
10925 current_entry_id = -1;
10927 old_obstack = labels_obstack;
10928 bitmap_obstack_initialize (&labels_obstack);
10930 resolve_code (ns->code, ns);
10932 bitmap_obstack_release (&labels_obstack);
10933 labels_obstack = old_obstack;
10937 /* This function is called after a complete program unit has been compiled.
10938 Its purpose is to examine all of the expressions associated with a program
10939 unit, assign types to all intermediate expressions, make sure that all
10940 assignments are to compatible types and figure out which names refer to
10941 which functions or subroutines. */
10944 gfc_resolve (gfc_namespace *ns)
10946 gfc_namespace *old_ns;
10951 old_ns = gfc_current_ns;
10953 resolve_types (ns);
10954 resolve_codes (ns);
10956 gfc_current_ns = old_ns;