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 (gfc_is_proc_ptr_comp (e, &comp))
1242 if (e->value.compcall.actual == NULL)
1243 e->expr_type = EXPR_VARIABLE;
1246 if (comp->as != NULL)
1247 e->rank = comp->as->rank;
1248 e->expr_type = EXPR_FUNCTION;
1253 if (e->expr_type == EXPR_VARIABLE
1254 && e->symtree->n.sym->attr.generic
1256 && count_specific_procs (e) != 1)
1259 if (e->ts.type != BT_PROCEDURE)
1261 save_need_full_assumed_size = need_full_assumed_size;
1262 if (e->expr_type != EXPR_VARIABLE)
1263 need_full_assumed_size = 0;
1264 if (gfc_resolve_expr (e) != SUCCESS)
1266 need_full_assumed_size = save_need_full_assumed_size;
1270 /* See if the expression node should really be a variable reference. */
1272 sym = e->symtree->n.sym;
1274 if (sym->attr.flavor == FL_PROCEDURE
1275 || sym->attr.intrinsic
1276 || sym->attr.external)
1280 /* If a procedure is not already determined to be something else
1281 check if it is intrinsic. */
1282 if (!sym->attr.intrinsic
1283 && !(sym->attr.external || sym->attr.use_assoc
1284 || sym->attr.if_source == IFSRC_IFBODY)
1285 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1286 sym->attr.intrinsic = 1;
1288 if (sym->attr.proc == PROC_ST_FUNCTION)
1290 gfc_error ("Statement function '%s' at %L is not allowed as an "
1291 "actual argument", sym->name, &e->where);
1294 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1295 sym->attr.subroutine);
1296 if (sym->attr.intrinsic && actual_ok == 0)
1298 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1299 "actual argument", sym->name, &e->where);
1302 if (sym->attr.contained && !sym->attr.use_assoc
1303 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1305 gfc_error ("Internal procedure '%s' is not allowed as an "
1306 "actual argument at %L", sym->name, &e->where);
1309 if (sym->attr.elemental && !sym->attr.intrinsic)
1311 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1312 "allowed as an actual argument at %L", sym->name,
1316 /* Check if a generic interface has a specific procedure
1317 with the same name before emitting an error. */
1318 if (sym->attr.generic && count_specific_procs (e) != 1)
1321 /* Just in case a specific was found for the expression. */
1322 sym = e->symtree->n.sym;
1324 /* If the symbol is the function that names the current (or
1325 parent) scope, then we really have a variable reference. */
1327 if (sym->attr.function && sym->result == sym
1328 && (sym->ns->proc_name == sym
1329 || (sym->ns->parent != NULL
1330 && sym->ns->parent->proc_name == sym)))
1333 /* If all else fails, see if we have a specific intrinsic. */
1334 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1336 gfc_intrinsic_sym *isym;
1338 isym = gfc_find_function (sym->name);
1339 if (isym == NULL || !isym->specific)
1341 gfc_error ("Unable to find a specific INTRINSIC procedure "
1342 "for the reference '%s' at %L", sym->name,
1347 sym->attr.intrinsic = 1;
1348 sym->attr.function = 1;
1351 if (gfc_resolve_expr (e) == FAILURE)
1356 /* See if the name is a module procedure in a parent unit. */
1358 if (was_declared (sym) || sym->ns->parent == NULL)
1361 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1363 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1367 if (parent_st == NULL)
1370 sym = parent_st->n.sym;
1371 e->symtree = parent_st; /* Point to the right thing. */
1373 if (sym->attr.flavor == FL_PROCEDURE
1374 || sym->attr.intrinsic
1375 || sym->attr.external)
1377 if (gfc_resolve_expr (e) == FAILURE)
1383 e->expr_type = EXPR_VARIABLE;
1385 if (sym->as != NULL)
1387 e->rank = sym->as->rank;
1388 e->ref = gfc_get_ref ();
1389 e->ref->type = REF_ARRAY;
1390 e->ref->u.ar.type = AR_FULL;
1391 e->ref->u.ar.as = sym->as;
1394 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1395 primary.c (match_actual_arg). If above code determines that it
1396 is a variable instead, it needs to be resolved as it was not
1397 done at the beginning of this function. */
1398 save_need_full_assumed_size = need_full_assumed_size;
1399 if (e->expr_type != EXPR_VARIABLE)
1400 need_full_assumed_size = 0;
1401 if (gfc_resolve_expr (e) != SUCCESS)
1403 need_full_assumed_size = save_need_full_assumed_size;
1406 /* Check argument list functions %VAL, %LOC and %REF. There is
1407 nothing to do for %REF. */
1408 if (arg->name && arg->name[0] == '%')
1410 if (strncmp ("%VAL", arg->name, 4) == 0)
1412 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1414 gfc_error ("By-value argument at %L is not of numeric "
1421 gfc_error ("By-value argument at %L cannot be an array or "
1422 "an array section", &e->where);
1426 /* Intrinsics are still PROC_UNKNOWN here. However,
1427 since same file external procedures are not resolvable
1428 in gfortran, it is a good deal easier to leave them to
1430 if (ptype != PROC_UNKNOWN
1431 && ptype != PROC_DUMMY
1432 && ptype != PROC_EXTERNAL
1433 && ptype != PROC_MODULE)
1435 gfc_error ("By-value argument at %L is not allowed "
1436 "in this context", &e->where);
1441 /* Statement functions have already been excluded above. */
1442 else if (strncmp ("%LOC", arg->name, 4) == 0
1443 && e->ts.type == BT_PROCEDURE)
1445 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1447 gfc_error ("Passing internal procedure at %L by location "
1448 "not allowed", &e->where);
1459 /* Do the checks of the actual argument list that are specific to elemental
1460 procedures. If called with c == NULL, we have a function, otherwise if
1461 expr == NULL, we have a subroutine. */
1464 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1466 gfc_actual_arglist *arg0;
1467 gfc_actual_arglist *arg;
1468 gfc_symbol *esym = NULL;
1469 gfc_intrinsic_sym *isym = NULL;
1471 gfc_intrinsic_arg *iformal = NULL;
1472 gfc_formal_arglist *eformal = NULL;
1473 bool formal_optional = false;
1474 bool set_by_optional = false;
1478 /* Is this an elemental procedure? */
1479 if (expr && expr->value.function.actual != NULL)
1481 if (expr->value.function.esym != NULL
1482 && expr->value.function.esym->attr.elemental)
1484 arg0 = expr->value.function.actual;
1485 esym = expr->value.function.esym;
1487 else if (expr->value.function.isym != NULL
1488 && expr->value.function.isym->elemental)
1490 arg0 = expr->value.function.actual;
1491 isym = expr->value.function.isym;
1496 else if (c && c->ext.actual != NULL)
1498 arg0 = c->ext.actual;
1500 if (c->resolved_sym)
1501 esym = c->resolved_sym;
1503 esym = c->symtree->n.sym;
1506 if (!esym->attr.elemental)
1512 /* The rank of an elemental is the rank of its array argument(s). */
1513 for (arg = arg0; arg; arg = arg->next)
1515 if (arg->expr != NULL && arg->expr->rank > 0)
1517 rank = arg->expr->rank;
1518 if (arg->expr->expr_type == EXPR_VARIABLE
1519 && arg->expr->symtree->n.sym->attr.optional)
1520 set_by_optional = true;
1522 /* Function specific; set the result rank and shape. */
1526 if (!expr->shape && arg->expr->shape)
1528 expr->shape = gfc_get_shape (rank);
1529 for (i = 0; i < rank; i++)
1530 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1537 /* If it is an array, it shall not be supplied as an actual argument
1538 to an elemental procedure unless an array of the same rank is supplied
1539 as an actual argument corresponding to a nonoptional dummy argument of
1540 that elemental procedure(12.4.1.5). */
1541 formal_optional = false;
1543 iformal = isym->formal;
1545 eformal = esym->formal;
1547 for (arg = arg0; arg; arg = arg->next)
1551 if (eformal->sym && eformal->sym->attr.optional)
1552 formal_optional = true;
1553 eformal = eformal->next;
1555 else if (isym && iformal)
1557 if (iformal->optional)
1558 formal_optional = true;
1559 iformal = iformal->next;
1562 formal_optional = true;
1564 if (pedantic && arg->expr != NULL
1565 && arg->expr->expr_type == EXPR_VARIABLE
1566 && arg->expr->symtree->n.sym->attr.optional
1569 && (set_by_optional || arg->expr->rank != rank)
1570 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1572 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1573 "MISSING, it cannot be the actual argument of an "
1574 "ELEMENTAL procedure unless there is a non-optional "
1575 "argument with the same rank (12.4.1.5)",
1576 arg->expr->symtree->n.sym->name, &arg->expr->where);
1581 for (arg = arg0; arg; arg = arg->next)
1583 if (arg->expr == NULL || arg->expr->rank == 0)
1586 /* Being elemental, the last upper bound of an assumed size array
1587 argument must be present. */
1588 if (resolve_assumed_size_actual (arg->expr))
1591 /* Elemental procedure's array actual arguments must conform. */
1594 if (gfc_check_conformance (arg->expr, e,
1595 "elemental procedure") == FAILURE)
1602 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1603 is an array, the intent inout/out variable needs to be also an array. */
1604 if (rank > 0 && esym && expr == NULL)
1605 for (eformal = esym->formal, arg = arg0; arg && eformal;
1606 arg = arg->next, eformal = eformal->next)
1607 if ((eformal->sym->attr.intent == INTENT_OUT
1608 || eformal->sym->attr.intent == INTENT_INOUT)
1609 && arg->expr && arg->expr->rank == 0)
1611 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1612 "ELEMENTAL subroutine '%s' is a scalar, but another "
1613 "actual argument is an array", &arg->expr->where,
1614 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1615 : "INOUT", eformal->sym->name, esym->name);
1622 /* Go through each actual argument in ACTUAL and see if it can be
1623 implemented as an inlined, non-copying intrinsic. FNSYM is the
1624 function being called, or NULL if not known. */
1627 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1629 gfc_actual_arglist *ap;
1632 for (ap = actual; ap; ap = ap->next)
1634 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1635 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1637 ap->expr->inline_noncopying_intrinsic = 1;
1641 /* This function does the checking of references to global procedures
1642 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1643 77 and 95 standards. It checks for a gsymbol for the name, making
1644 one if it does not already exist. If it already exists, then the
1645 reference being resolved must correspond to the type of gsymbol.
1646 Otherwise, the new symbol is equipped with the attributes of the
1647 reference. The corresponding code that is called in creating
1648 global entities is parse.c.
1650 In addition, for all but -std=legacy, the gsymbols are used to
1651 check the interfaces of external procedures from the same file.
1652 The namespace of the gsymbol is resolved and then, once this is
1653 done the interface is checked. */
1657 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1659 if (!gsym_ns->proc_name->attr.recursive)
1662 if (sym->ns == gsym_ns)
1665 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1672 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1674 if (gsym_ns->entries)
1676 gfc_entry_list *entry = gsym_ns->entries;
1678 for (; entry; entry = entry->next)
1680 if (strcmp (sym->name, entry->sym->name) == 0)
1682 if (strcmp (gsym_ns->proc_name->name,
1683 sym->ns->proc_name->name) == 0)
1687 && strcmp (gsym_ns->proc_name->name,
1688 sym->ns->parent->proc_name->name) == 0)
1697 resolve_global_procedure (gfc_symbol *sym, locus *where,
1698 gfc_actual_arglist **actual, int sub)
1702 enum gfc_symbol_type type;
1704 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1706 gsym = gfc_get_gsymbol (sym->name);
1708 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1709 gfc_global_used (gsym, where);
1711 if (gfc_option.flag_whole_file
1712 && sym->attr.if_source == IFSRC_UNKNOWN
1713 && gsym->type != GSYM_UNKNOWN
1715 && gsym->ns->resolved != -1
1716 && gsym->ns->proc_name
1717 && not_in_recursive (sym, gsym->ns)
1718 && not_entry_self_reference (sym, gsym->ns))
1720 /* Make sure that translation for the gsymbol occurs before
1721 the procedure currently being resolved. */
1722 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1723 for (; ns && ns != gsym->ns; ns = ns->sibling)
1725 if (ns->sibling == gsym->ns)
1727 ns->sibling = gsym->ns->sibling;
1728 gsym->ns->sibling = gfc_global_ns_list;
1729 gfc_global_ns_list = gsym->ns;
1734 if (!gsym->ns->resolved)
1736 gfc_dt_list *old_dt_list;
1738 /* Stash away derived types so that the backend_decls do not
1740 old_dt_list = gfc_derived_types;
1741 gfc_derived_types = NULL;
1743 gfc_resolve (gsym->ns);
1745 /* Store the new derived types with the global namespace. */
1746 if (gfc_derived_types)
1747 gsym->ns->derived_types = gfc_derived_types;
1749 /* Restore the derived types of this namespace. */
1750 gfc_derived_types = old_dt_list;
1753 if (gsym->ns->proc_name->attr.function
1754 && gsym->ns->proc_name->as
1755 && gsym->ns->proc_name->as->rank
1756 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1757 gfc_error ("The reference to function '%s' at %L either needs an "
1758 "explicit INTERFACE or the rank is incorrect", sym->name,
1761 if (gfc_option.flag_whole_file == 1
1762 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1764 !(gfc_option.warn_std & GFC_STD_GNU)))
1765 gfc_errors_to_warnings (1);
1767 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1769 gfc_errors_to_warnings (0);
1772 if (gsym->type == GSYM_UNKNOWN)
1775 gsym->where = *where;
1782 /************* Function resolution *************/
1784 /* Resolve a function call known to be generic.
1785 Section 14.1.2.4.1. */
1788 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1792 if (sym->attr.generic)
1794 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1797 expr->value.function.name = s->name;
1798 expr->value.function.esym = s;
1800 if (s->ts.type != BT_UNKNOWN)
1802 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1803 expr->ts = s->result->ts;
1806 expr->rank = s->as->rank;
1807 else if (s->result != NULL && s->result->as != NULL)
1808 expr->rank = s->result->as->rank;
1810 gfc_set_sym_referenced (expr->value.function.esym);
1815 /* TODO: Need to search for elemental references in generic
1819 if (sym->attr.intrinsic)
1820 return gfc_intrinsic_func_interface (expr, 0);
1827 resolve_generic_f (gfc_expr *expr)
1832 sym = expr->symtree->n.sym;
1836 m = resolve_generic_f0 (expr, sym);
1839 else if (m == MATCH_ERROR)
1843 if (sym->ns->parent == NULL)
1845 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1849 if (!generic_sym (sym))
1853 /* Last ditch attempt. See if the reference is to an intrinsic
1854 that possesses a matching interface. 14.1.2.4 */
1855 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1857 gfc_error ("There is no specific function for the generic '%s' at %L",
1858 expr->symtree->n.sym->name, &expr->where);
1862 m = gfc_intrinsic_func_interface (expr, 0);
1866 gfc_error ("Generic function '%s' at %L is not consistent with a "
1867 "specific intrinsic interface", expr->symtree->n.sym->name,
1874 /* Resolve a function call known to be specific. */
1877 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1881 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1883 if (sym->attr.dummy)
1885 sym->attr.proc = PROC_DUMMY;
1889 sym->attr.proc = PROC_EXTERNAL;
1893 if (sym->attr.proc == PROC_MODULE
1894 || sym->attr.proc == PROC_ST_FUNCTION
1895 || sym->attr.proc == PROC_INTERNAL)
1898 if (sym->attr.intrinsic)
1900 m = gfc_intrinsic_func_interface (expr, 1);
1904 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1905 "with an intrinsic", sym->name, &expr->where);
1913 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1916 expr->ts = sym->result->ts;
1919 expr->value.function.name = sym->name;
1920 expr->value.function.esym = sym;
1921 if (sym->as != NULL)
1922 expr->rank = sym->as->rank;
1929 resolve_specific_f (gfc_expr *expr)
1934 sym = expr->symtree->n.sym;
1938 m = resolve_specific_f0 (sym, expr);
1941 if (m == MATCH_ERROR)
1944 if (sym->ns->parent == NULL)
1947 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1953 gfc_error ("Unable to resolve the specific function '%s' at %L",
1954 expr->symtree->n.sym->name, &expr->where);
1960 /* Resolve a procedure call not known to be generic nor specific. */
1963 resolve_unknown_f (gfc_expr *expr)
1968 sym = expr->symtree->n.sym;
1970 if (sym->attr.dummy)
1972 sym->attr.proc = PROC_DUMMY;
1973 expr->value.function.name = sym->name;
1977 /* See if we have an intrinsic function reference. */
1979 if (gfc_is_intrinsic (sym, 0, expr->where))
1981 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
1986 /* The reference is to an external name. */
1988 sym->attr.proc = PROC_EXTERNAL;
1989 expr->value.function.name = sym->name;
1990 expr->value.function.esym = expr->symtree->n.sym;
1992 if (sym->as != NULL)
1993 expr->rank = sym->as->rank;
1995 /* Type of the expression is either the type of the symbol or the
1996 default type of the symbol. */
1999 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2001 if (sym->ts.type != BT_UNKNOWN)
2005 ts = gfc_get_default_type (sym->name, sym->ns);
2007 if (ts->type == BT_UNKNOWN)
2009 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2010 sym->name, &expr->where);
2021 /* Return true, if the symbol is an external procedure. */
2023 is_external_proc (gfc_symbol *sym)
2025 if (!sym->attr.dummy && !sym->attr.contained
2026 && !(sym->attr.intrinsic
2027 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2028 && sym->attr.proc != PROC_ST_FUNCTION
2029 && !sym->attr.use_assoc
2037 /* Figure out if a function reference is pure or not. Also set the name
2038 of the function for a potential error message. Return nonzero if the
2039 function is PURE, zero if not. */
2041 pure_stmt_function (gfc_expr *, gfc_symbol *);
2044 pure_function (gfc_expr *e, const char **name)
2050 if (e->symtree != NULL
2051 && e->symtree->n.sym != NULL
2052 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2053 return pure_stmt_function (e, e->symtree->n.sym);
2055 if (e->value.function.esym)
2057 pure = gfc_pure (e->value.function.esym);
2058 *name = e->value.function.esym->name;
2060 else if (e->value.function.isym)
2062 pure = e->value.function.isym->pure
2063 || e->value.function.isym->elemental;
2064 *name = e->value.function.isym->name;
2068 /* Implicit functions are not pure. */
2070 *name = e->value.function.name;
2078 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2079 int *f ATTRIBUTE_UNUSED)
2083 /* Don't bother recursing into other statement functions
2084 since they will be checked individually for purity. */
2085 if (e->expr_type != EXPR_FUNCTION
2087 || e->symtree->n.sym == sym
2088 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2091 return pure_function (e, &name) ? false : true;
2096 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2098 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2103 is_scalar_expr_ptr (gfc_expr *expr)
2105 gfc_try retval = SUCCESS;
2110 /* See if we have a gfc_ref, which means we have a substring, array
2111 reference, or a component. */
2112 if (expr->ref != NULL)
2115 while (ref->next != NULL)
2121 if (ref->u.ss.length != NULL
2122 && ref->u.ss.length->length != NULL
2124 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2126 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2128 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2129 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2130 if (end - start + 1 != 1)
2137 if (ref->u.ar.type == AR_ELEMENT)
2139 else if (ref->u.ar.type == AR_FULL)
2141 /* The user can give a full array if the array is of size 1. */
2142 if (ref->u.ar.as != NULL
2143 && ref->u.ar.as->rank == 1
2144 && ref->u.ar.as->type == AS_EXPLICIT
2145 && ref->u.ar.as->lower[0] != NULL
2146 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2147 && ref->u.ar.as->upper[0] != NULL
2148 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2150 /* If we have a character string, we need to check if
2151 its length is one. */
2152 if (expr->ts.type == BT_CHARACTER)
2154 if (expr->ts.cl == NULL
2155 || expr->ts.cl->length == NULL
2156 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1)
2162 /* We have constant lower and upper bounds. If the
2163 difference between is 1, it can be considered a
2165 start = (int) mpz_get_si
2166 (ref->u.ar.as->lower[0]->value.integer);
2167 end = (int) mpz_get_si
2168 (ref->u.ar.as->upper[0]->value.integer);
2169 if (end - start + 1 != 1)
2184 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2186 /* Character string. Make sure it's of length 1. */
2187 if (expr->ts.cl == NULL
2188 || expr->ts.cl->length == NULL
2189 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1) != 0)
2192 else if (expr->rank != 0)
2199 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2200 and, in the case of c_associated, set the binding label based on
2204 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2205 gfc_symbol **new_sym)
2207 char name[GFC_MAX_SYMBOL_LEN + 1];
2208 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2209 int optional_arg = 0, is_pointer = 0;
2210 gfc_try retval = SUCCESS;
2211 gfc_symbol *args_sym;
2212 gfc_typespec *arg_ts;
2214 if (args->expr->expr_type == EXPR_CONSTANT
2215 || args->expr->expr_type == EXPR_OP
2216 || args->expr->expr_type == EXPR_NULL)
2218 gfc_error ("Argument to '%s' at %L is not a variable",
2219 sym->name, &(args->expr->where));
2223 args_sym = args->expr->symtree->n.sym;
2225 /* The typespec for the actual arg should be that stored in the expr
2226 and not necessarily that of the expr symbol (args_sym), because
2227 the actual expression could be a part-ref of the expr symbol. */
2228 arg_ts = &(args->expr->ts);
2230 is_pointer = gfc_is_data_pointer (args->expr);
2232 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2234 /* If the user gave two args then they are providing something for
2235 the optional arg (the second cptr). Therefore, set the name and
2236 binding label to the c_associated for two cptrs. Otherwise,
2237 set c_associated to expect one cptr. */
2241 sprintf (name, "%s_2", sym->name);
2242 sprintf (binding_label, "%s_2", sym->binding_label);
2248 sprintf (name, "%s_1", sym->name);
2249 sprintf (binding_label, "%s_1", sym->binding_label);
2253 /* Get a new symbol for the version of c_associated that
2255 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2257 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2258 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2260 sprintf (name, "%s", sym->name);
2261 sprintf (binding_label, "%s", sym->binding_label);
2263 /* Error check the call. */
2264 if (args->next != NULL)
2266 gfc_error_now ("More actual than formal arguments in '%s' "
2267 "call at %L", name, &(args->expr->where));
2270 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2272 /* Make sure we have either the target or pointer attribute. */
2273 if (!args_sym->attr.target && !is_pointer)
2275 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2276 "a TARGET or an associated pointer",
2278 sym->name, &(args->expr->where));
2282 /* See if we have interoperable type and type param. */
2283 if (verify_c_interop (arg_ts) == SUCCESS
2284 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2286 if (args_sym->attr.target == 1)
2288 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2289 has the target attribute and is interoperable. */
2290 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2291 allocatable variable that has the TARGET attribute and
2292 is not an array of zero size. */
2293 if (args_sym->attr.allocatable == 1)
2295 if (args_sym->attr.dimension != 0
2296 && (args_sym->as && args_sym->as->rank == 0))
2298 gfc_error_now ("Allocatable variable '%s' used as a "
2299 "parameter to '%s' at %L must not be "
2300 "an array of zero size",
2301 args_sym->name, sym->name,
2302 &(args->expr->where));
2308 /* A non-allocatable target variable with C
2309 interoperable type and type parameters must be
2311 if (args_sym && args_sym->attr.dimension)
2313 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2315 gfc_error ("Assumed-shape array '%s' at %L "
2316 "cannot be an argument to the "
2317 "procedure '%s' because "
2318 "it is not C interoperable",
2320 &(args->expr->where), sym->name);
2323 else if (args_sym->as->type == AS_DEFERRED)
2325 gfc_error ("Deferred-shape array '%s' at %L "
2326 "cannot be an argument to the "
2327 "procedure '%s' because "
2328 "it is not C interoperable",
2330 &(args->expr->where), sym->name);
2335 /* Make sure it's not a character string. Arrays of
2336 any type should be ok if the variable is of a C
2337 interoperable type. */
2338 if (arg_ts->type == BT_CHARACTER)
2339 if (arg_ts->cl != NULL
2340 && (arg_ts->cl->length == NULL
2341 || arg_ts->cl->length->expr_type
2344 (arg_ts->cl->length->value.integer, 1)
2346 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2348 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2349 "at %L must have a length of 1",
2350 args_sym->name, sym->name,
2351 &(args->expr->where));
2357 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2359 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2361 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2362 "associated scalar POINTER", args_sym->name,
2363 sym->name, &(args->expr->where));
2369 /* The parameter is not required to be C interoperable. If it
2370 is not C interoperable, it must be a nonpolymorphic scalar
2371 with no length type parameters. It still must have either
2372 the pointer or target attribute, and it can be
2373 allocatable (but must be allocated when c_loc is called). */
2374 if (args->expr->rank != 0
2375 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2377 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2378 "scalar", args_sym->name, sym->name,
2379 &(args->expr->where));
2382 else if (arg_ts->type == BT_CHARACTER
2383 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2385 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2386 "%L must have a length of 1",
2387 args_sym->name, sym->name,
2388 &(args->expr->where));
2393 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2395 if (args_sym->attr.flavor != FL_PROCEDURE)
2397 /* TODO: Update this error message to allow for procedure
2398 pointers once they are implemented. */
2399 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2401 args_sym->name, sym->name,
2402 &(args->expr->where));
2405 else if (args_sym->attr.is_bind_c != 1)
2407 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2409 args_sym->name, sym->name,
2410 &(args->expr->where));
2415 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2420 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2421 "iso_c_binding function: '%s'!\n", sym->name);
2428 /* Resolve a function call, which means resolving the arguments, then figuring
2429 out which entity the name refers to. */
2430 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2431 to INTENT(OUT) or INTENT(INOUT). */
2434 resolve_function (gfc_expr *expr)
2436 gfc_actual_arglist *arg;
2441 procedure_type p = PROC_INTRINSIC;
2442 bool no_formal_args;
2446 sym = expr->symtree->n.sym;
2448 if (sym && sym->attr.intrinsic
2449 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2452 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2454 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2458 if (sym && sym->attr.abstract)
2460 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2461 sym->name, &expr->where);
2465 /* Switch off assumed size checking and do this again for certain kinds
2466 of procedure, once the procedure itself is resolved. */
2467 need_full_assumed_size++;
2469 if (expr->symtree && expr->symtree->n.sym)
2470 p = expr->symtree->n.sym->attr.proc;
2472 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2473 if (resolve_actual_arglist (expr->value.function.actual,
2474 p, no_formal_args) == FAILURE)
2477 /* Need to setup the call to the correct c_associated, depending on
2478 the number of cptrs to user gives to compare. */
2479 if (sym && sym->attr.is_iso_c == 1)
2481 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2485 /* Get the symtree for the new symbol (resolved func).
2486 the old one will be freed later, when it's no longer used. */
2487 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2490 /* Resume assumed_size checking. */
2491 need_full_assumed_size--;
2493 /* If the procedure is external, check for usage. */
2494 if (sym && is_external_proc (sym))
2495 resolve_global_procedure (sym, &expr->where,
2496 &expr->value.function.actual, 0);
2498 if (sym && sym->ts.type == BT_CHARACTER
2500 && sym->ts.cl->length == NULL
2502 && expr->value.function.esym == NULL
2503 && !sym->attr.contained)
2505 /* Internal procedures are taken care of in resolve_contained_fntype. */
2506 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2507 "be used at %L since it is not a dummy argument",
2508 sym->name, &expr->where);
2512 /* See if function is already resolved. */
2514 if (expr->value.function.name != NULL)
2516 if (expr->ts.type == BT_UNKNOWN)
2522 /* Apply the rules of section 14.1.2. */
2524 switch (procedure_kind (sym))
2527 t = resolve_generic_f (expr);
2530 case PTYPE_SPECIFIC:
2531 t = resolve_specific_f (expr);
2535 t = resolve_unknown_f (expr);
2539 gfc_internal_error ("resolve_function(): bad function type");
2543 /* If the expression is still a function (it might have simplified),
2544 then we check to see if we are calling an elemental function. */
2546 if (expr->expr_type != EXPR_FUNCTION)
2549 temp = need_full_assumed_size;
2550 need_full_assumed_size = 0;
2552 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2555 if (omp_workshare_flag
2556 && expr->value.function.esym
2557 && ! gfc_elemental (expr->value.function.esym))
2559 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2560 "in WORKSHARE construct", expr->value.function.esym->name,
2565 #define GENERIC_ID expr->value.function.isym->id
2566 else if (expr->value.function.actual != NULL
2567 && expr->value.function.isym != NULL
2568 && GENERIC_ID != GFC_ISYM_LBOUND
2569 && GENERIC_ID != GFC_ISYM_LEN
2570 && GENERIC_ID != GFC_ISYM_LOC
2571 && GENERIC_ID != GFC_ISYM_PRESENT)
2573 /* Array intrinsics must also have the last upper bound of an
2574 assumed size array argument. UBOUND and SIZE have to be
2575 excluded from the check if the second argument is anything
2578 for (arg = expr->value.function.actual; arg; arg = arg->next)
2580 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2581 && arg->next != NULL && arg->next->expr)
2583 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2586 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2589 if ((int)mpz_get_si (arg->next->expr->value.integer)
2594 if (arg->expr != NULL
2595 && arg->expr->rank > 0
2596 && resolve_assumed_size_actual (arg->expr))
2602 need_full_assumed_size = temp;
2605 if (!pure_function (expr, &name) && name)
2609 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2610 "FORALL %s", name, &expr->where,
2611 forall_flag == 2 ? "mask" : "block");
2614 else if (gfc_pure (NULL))
2616 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2617 "procedure within a PURE procedure", name, &expr->where);
2622 /* Functions without the RECURSIVE attribution are not allowed to
2623 * call themselves. */
2624 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2627 esym = expr->value.function.esym;
2629 if (is_illegal_recursion (esym, gfc_current_ns))
2631 if (esym->attr.entry && esym->ns->entries)
2632 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2633 " function '%s' is not RECURSIVE",
2634 esym->name, &expr->where, esym->ns->entries->sym->name);
2636 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2637 " is not RECURSIVE", esym->name, &expr->where);
2643 /* Character lengths of use associated functions may contains references to
2644 symbols not referenced from the current program unit otherwise. Make sure
2645 those symbols are marked as referenced. */
2647 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2648 && expr->value.function.esym->attr.use_assoc)
2650 gfc_expr_set_symbols_referenced (expr->ts.cl->length);
2654 && !((expr->value.function.esym
2655 && expr->value.function.esym->attr.elemental)
2657 (expr->value.function.isym
2658 && expr->value.function.isym->elemental)))
2659 find_noncopying_intrinsics (expr->value.function.esym,
2660 expr->value.function.actual);
2662 /* Make sure that the expression has a typespec that works. */
2663 if (expr->ts.type == BT_UNKNOWN)
2665 if (expr->symtree->n.sym->result
2666 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2667 && !expr->symtree->n.sym->result->attr.proc_pointer)
2668 expr->ts = expr->symtree->n.sym->result->ts;
2675 /************* Subroutine resolution *************/
2678 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2684 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2685 sym->name, &c->loc);
2686 else if (gfc_pure (NULL))
2687 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2693 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2697 if (sym->attr.generic)
2699 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2702 c->resolved_sym = s;
2703 pure_subroutine (c, s);
2707 /* TODO: Need to search for elemental references in generic interface. */
2710 if (sym->attr.intrinsic)
2711 return gfc_intrinsic_sub_interface (c, 0);
2718 resolve_generic_s (gfc_code *c)
2723 sym = c->symtree->n.sym;
2727 m = resolve_generic_s0 (c, sym);
2730 else if (m == MATCH_ERROR)
2734 if (sym->ns->parent == NULL)
2736 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2740 if (!generic_sym (sym))
2744 /* Last ditch attempt. See if the reference is to an intrinsic
2745 that possesses a matching interface. 14.1.2.4 */
2746 sym = c->symtree->n.sym;
2748 if (!gfc_is_intrinsic (sym, 1, c->loc))
2750 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2751 sym->name, &c->loc);
2755 m = gfc_intrinsic_sub_interface (c, 0);
2759 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2760 "intrinsic subroutine interface", sym->name, &c->loc);
2766 /* Set the name and binding label of the subroutine symbol in the call
2767 expression represented by 'c' to include the type and kind of the
2768 second parameter. This function is for resolving the appropriate
2769 version of c_f_pointer() and c_f_procpointer(). For example, a
2770 call to c_f_pointer() for a default integer pointer could have a
2771 name of c_f_pointer_i4. If no second arg exists, which is an error
2772 for these two functions, it defaults to the generic symbol's name
2773 and binding label. */
2776 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2777 char *name, char *binding_label)
2779 gfc_expr *arg = NULL;
2783 /* The second arg of c_f_pointer and c_f_procpointer determines
2784 the type and kind for the procedure name. */
2785 arg = c->ext.actual->next->expr;
2789 /* Set up the name to have the given symbol's name,
2790 plus the type and kind. */
2791 /* a derived type is marked with the type letter 'u' */
2792 if (arg->ts.type == BT_DERIVED)
2795 kind = 0; /* set the kind as 0 for now */
2799 type = gfc_type_letter (arg->ts.type);
2800 kind = arg->ts.kind;
2803 if (arg->ts.type == BT_CHARACTER)
2804 /* Kind info for character strings not needed. */
2807 sprintf (name, "%s_%c%d", sym->name, type, kind);
2808 /* Set up the binding label as the given symbol's label plus
2809 the type and kind. */
2810 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2814 /* If the second arg is missing, set the name and label as
2815 was, cause it should at least be found, and the missing
2816 arg error will be caught by compare_parameters(). */
2817 sprintf (name, "%s", sym->name);
2818 sprintf (binding_label, "%s", sym->binding_label);
2825 /* Resolve a generic version of the iso_c_binding procedure given
2826 (sym) to the specific one based on the type and kind of the
2827 argument(s). Currently, this function resolves c_f_pointer() and
2828 c_f_procpointer based on the type and kind of the second argument
2829 (FPTR). Other iso_c_binding procedures aren't specially handled.
2830 Upon successfully exiting, c->resolved_sym will hold the resolved
2831 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2835 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2837 gfc_symbol *new_sym;
2838 /* this is fine, since we know the names won't use the max */
2839 char name[GFC_MAX_SYMBOL_LEN + 1];
2840 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2841 /* default to success; will override if find error */
2842 match m = MATCH_YES;
2844 /* Make sure the actual arguments are in the necessary order (based on the
2845 formal args) before resolving. */
2846 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2848 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2849 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2851 set_name_and_label (c, sym, name, binding_label);
2853 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2855 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2857 /* Make sure we got a third arg if the second arg has non-zero
2858 rank. We must also check that the type and rank are
2859 correct since we short-circuit this check in
2860 gfc_procedure_use() (called above to sort actual args). */
2861 if (c->ext.actual->next->expr->rank != 0)
2863 if(c->ext.actual->next->next == NULL
2864 || c->ext.actual->next->next->expr == NULL)
2867 gfc_error ("Missing SHAPE parameter for call to %s "
2868 "at %L", sym->name, &(c->loc));
2870 else if (c->ext.actual->next->next->expr->ts.type
2872 || c->ext.actual->next->next->expr->rank != 1)
2875 gfc_error ("SHAPE parameter for call to %s at %L must "
2876 "be a rank 1 INTEGER array", sym->name,
2883 if (m != MATCH_ERROR)
2885 /* the 1 means to add the optional arg to formal list */
2886 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2888 /* for error reporting, say it's declared where the original was */
2889 new_sym->declared_at = sym->declared_at;
2894 /* no differences for c_loc or c_funloc */
2898 /* set the resolved symbol */
2899 if (m != MATCH_ERROR)
2900 c->resolved_sym = new_sym;
2902 c->resolved_sym = sym;
2908 /* Resolve a subroutine call known to be specific. */
2911 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2915 if(sym->attr.is_iso_c)
2917 m = gfc_iso_c_sub_interface (c,sym);
2921 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2923 if (sym->attr.dummy)
2925 sym->attr.proc = PROC_DUMMY;
2929 sym->attr.proc = PROC_EXTERNAL;
2933 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2936 if (sym->attr.intrinsic)
2938 m = gfc_intrinsic_sub_interface (c, 1);
2942 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2943 "with an intrinsic", sym->name, &c->loc);
2951 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2953 c->resolved_sym = sym;
2954 pure_subroutine (c, sym);
2961 resolve_specific_s (gfc_code *c)
2966 sym = c->symtree->n.sym;
2970 m = resolve_specific_s0 (c, sym);
2973 if (m == MATCH_ERROR)
2976 if (sym->ns->parent == NULL)
2979 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2985 sym = c->symtree->n.sym;
2986 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
2987 sym->name, &c->loc);
2993 /* Resolve a subroutine call not known to be generic nor specific. */
2996 resolve_unknown_s (gfc_code *c)
3000 sym = c->symtree->n.sym;
3002 if (sym->attr.dummy)
3004 sym->attr.proc = PROC_DUMMY;
3008 /* See if we have an intrinsic function reference. */
3010 if (gfc_is_intrinsic (sym, 1, c->loc))
3012 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3017 /* The reference is to an external name. */
3020 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3022 c->resolved_sym = sym;
3024 pure_subroutine (c, sym);
3030 /* Resolve a subroutine call. Although it was tempting to use the same code
3031 for functions, subroutines and functions are stored differently and this
3032 makes things awkward. */
3035 resolve_call (gfc_code *c)
3038 procedure_type ptype = PROC_INTRINSIC;
3039 gfc_symbol *csym, *sym;
3040 bool no_formal_args;
3042 csym = c->symtree ? c->symtree->n.sym : NULL;
3044 if (csym && csym->ts.type != BT_UNKNOWN)
3046 gfc_error ("'%s' at %L has a type, which is not consistent with "
3047 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3051 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3054 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3055 sym = st ? st->n.sym : NULL;
3056 if (sym && csym != sym
3057 && sym->ns == gfc_current_ns
3058 && sym->attr.flavor == FL_PROCEDURE
3059 && sym->attr.contained)
3062 if (csym->attr.generic)
3063 c->symtree->n.sym = sym;
3066 csym = c->symtree->n.sym;
3070 /* Subroutines without the RECURSIVE attribution are not allowed to
3071 * call themselves. */
3072 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3074 if (csym->attr.entry && csym->ns->entries)
3075 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3076 " subroutine '%s' is not RECURSIVE",
3077 csym->name, &c->loc, csym->ns->entries->sym->name);
3079 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3080 " is not RECURSIVE", csym->name, &c->loc);
3085 /* Switch off assumed size checking and do this again for certain kinds
3086 of procedure, once the procedure itself is resolved. */
3087 need_full_assumed_size++;
3090 ptype = csym->attr.proc;
3092 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3093 if (resolve_actual_arglist (c->ext.actual, ptype,
3094 no_formal_args) == FAILURE)
3097 /* Resume assumed_size checking. */
3098 need_full_assumed_size--;
3100 /* If external, check for usage. */
3101 if (csym && is_external_proc (csym))
3102 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3105 if (c->resolved_sym == NULL)
3107 c->resolved_isym = NULL;
3108 switch (procedure_kind (csym))
3111 t = resolve_generic_s (c);
3114 case PTYPE_SPECIFIC:
3115 t = resolve_specific_s (c);
3119 t = resolve_unknown_s (c);
3123 gfc_internal_error ("resolve_subroutine(): bad function type");
3127 /* Some checks of elemental subroutine actual arguments. */
3128 if (resolve_elemental_actual (NULL, c) == FAILURE)
3131 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3132 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3137 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3138 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3139 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3140 if their shapes do not match. If either op1->shape or op2->shape is
3141 NULL, return SUCCESS. */
3144 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3151 if (op1->shape != NULL && op2->shape != NULL)
3153 for (i = 0; i < op1->rank; i++)
3155 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3157 gfc_error ("Shapes for operands at %L and %L are not conformable",
3158 &op1->where, &op2->where);
3169 /* Resolve an operator expression node. This can involve replacing the
3170 operation with a user defined function call. */
3173 resolve_operator (gfc_expr *e)
3175 gfc_expr *op1, *op2;
3177 bool dual_locus_error;
3180 /* Resolve all subnodes-- give them types. */
3182 switch (e->value.op.op)
3185 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3188 /* Fall through... */
3191 case INTRINSIC_UPLUS:
3192 case INTRINSIC_UMINUS:
3193 case INTRINSIC_PARENTHESES:
3194 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3199 /* Typecheck the new node. */
3201 op1 = e->value.op.op1;
3202 op2 = e->value.op.op2;
3203 dual_locus_error = false;
3205 if ((op1 && op1->expr_type == EXPR_NULL)
3206 || (op2 && op2->expr_type == EXPR_NULL))
3208 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3212 switch (e->value.op.op)
3214 case INTRINSIC_UPLUS:
3215 case INTRINSIC_UMINUS:
3216 if (op1->ts.type == BT_INTEGER
3217 || op1->ts.type == BT_REAL
3218 || op1->ts.type == BT_COMPLEX)
3224 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3225 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3228 case INTRINSIC_PLUS:
3229 case INTRINSIC_MINUS:
3230 case INTRINSIC_TIMES:
3231 case INTRINSIC_DIVIDE:
3232 case INTRINSIC_POWER:
3233 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3235 gfc_type_convert_binary (e);
3240 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3241 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3242 gfc_typename (&op2->ts));
3245 case INTRINSIC_CONCAT:
3246 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3247 && op1->ts.kind == op2->ts.kind)
3249 e->ts.type = BT_CHARACTER;
3250 e->ts.kind = op1->ts.kind;
3255 _("Operands of string concatenation operator at %%L are %s/%s"),
3256 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3262 case INTRINSIC_NEQV:
3263 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3265 e->ts.type = BT_LOGICAL;
3266 e->ts.kind = gfc_kind_max (op1, op2);
3267 if (op1->ts.kind < e->ts.kind)
3268 gfc_convert_type (op1, &e->ts, 2);
3269 else if (op2->ts.kind < e->ts.kind)
3270 gfc_convert_type (op2, &e->ts, 2);
3274 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3275 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3276 gfc_typename (&op2->ts));
3281 if (op1->ts.type == BT_LOGICAL)
3283 e->ts.type = BT_LOGICAL;
3284 e->ts.kind = op1->ts.kind;
3288 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3289 gfc_typename (&op1->ts));
3293 case INTRINSIC_GT_OS:
3295 case INTRINSIC_GE_OS:
3297 case INTRINSIC_LT_OS:
3299 case INTRINSIC_LE_OS:
3300 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3302 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3306 /* Fall through... */
3309 case INTRINSIC_EQ_OS:
3311 case INTRINSIC_NE_OS:
3312 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3313 && op1->ts.kind == op2->ts.kind)
3315 e->ts.type = BT_LOGICAL;
3316 e->ts.kind = gfc_default_logical_kind;
3320 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3322 gfc_type_convert_binary (e);
3324 e->ts.type = BT_LOGICAL;
3325 e->ts.kind = gfc_default_logical_kind;
3329 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3331 _("Logicals at %%L must be compared with %s instead of %s"),
3332 (e->value.op.op == INTRINSIC_EQ
3333 || e->value.op.op == INTRINSIC_EQ_OS)
3334 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3337 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3338 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3339 gfc_typename (&op2->ts));
3343 case INTRINSIC_USER:
3344 if (e->value.op.uop->op == NULL)
3345 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3346 else if (op2 == NULL)
3347 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3348 e->value.op.uop->name, gfc_typename (&op1->ts));
3350 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3351 e->value.op.uop->name, gfc_typename (&op1->ts),
3352 gfc_typename (&op2->ts));
3356 case INTRINSIC_PARENTHESES:
3358 if (e->ts.type == BT_CHARACTER)
3359 e->ts.cl = op1->ts.cl;
3363 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3366 /* Deal with arrayness of an operand through an operator. */
3370 switch (e->value.op.op)
3372 case INTRINSIC_PLUS:
3373 case INTRINSIC_MINUS:
3374 case INTRINSIC_TIMES:
3375 case INTRINSIC_DIVIDE:
3376 case INTRINSIC_POWER:
3377 case INTRINSIC_CONCAT:
3381 case INTRINSIC_NEQV:
3383 case INTRINSIC_EQ_OS:
3385 case INTRINSIC_NE_OS:
3387 case INTRINSIC_GT_OS:
3389 case INTRINSIC_GE_OS:
3391 case INTRINSIC_LT_OS:
3393 case INTRINSIC_LE_OS:
3395 if (op1->rank == 0 && op2->rank == 0)
3398 if (op1->rank == 0 && op2->rank != 0)
3400 e->rank = op2->rank;
3402 if (e->shape == NULL)
3403 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3406 if (op1->rank != 0 && op2->rank == 0)
3408 e->rank = op1->rank;
3410 if (e->shape == NULL)
3411 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3414 if (op1->rank != 0 && op2->rank != 0)
3416 if (op1->rank == op2->rank)
3418 e->rank = op1->rank;
3419 if (e->shape == NULL)
3421 t = compare_shapes(op1, op2);
3425 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3430 /* Allow higher level expressions to work. */
3433 /* Try user-defined operators, and otherwise throw an error. */
3434 dual_locus_error = true;
3436 _("Inconsistent ranks for operator at %%L and %%L"));
3443 case INTRINSIC_PARENTHESES:
3445 case INTRINSIC_UPLUS:
3446 case INTRINSIC_UMINUS:
3447 /* Simply copy arrayness attribute */
3448 e->rank = op1->rank;
3450 if (e->shape == NULL)
3451 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3459 /* Attempt to simplify the expression. */
3462 t = gfc_simplify_expr (e, 0);
3463 /* Some calls do not succeed in simplification and return FAILURE
3464 even though there is no error; e.g. variable references to
3465 PARAMETER arrays. */
3466 if (!gfc_is_constant_expr (e))
3473 if (gfc_extend_expr (e) == SUCCESS)
3476 if (dual_locus_error)
3477 gfc_error (msg, &op1->where, &op2->where);
3479 gfc_error (msg, &e->where);
3485 /************** Array resolution subroutines **************/
3488 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3491 /* Compare two integer expressions. */
3494 compare_bound (gfc_expr *a, gfc_expr *b)
3498 if (a == NULL || a->expr_type != EXPR_CONSTANT
3499 || b == NULL || b->expr_type != EXPR_CONSTANT)
3502 /* If either of the types isn't INTEGER, we must have
3503 raised an error earlier. */
3505 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3508 i = mpz_cmp (a->value.integer, b->value.integer);
3518 /* Compare an integer expression with an integer. */
3521 compare_bound_int (gfc_expr *a, int b)
3525 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3528 if (a->ts.type != BT_INTEGER)
3529 gfc_internal_error ("compare_bound_int(): Bad expression");
3531 i = mpz_cmp_si (a->value.integer, b);
3541 /* Compare an integer expression with a mpz_t. */
3544 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3548 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3551 if (a->ts.type != BT_INTEGER)
3552 gfc_internal_error ("compare_bound_int(): Bad expression");
3554 i = mpz_cmp (a->value.integer, b);
3564 /* Compute the last value of a sequence given by a triplet.
3565 Return 0 if it wasn't able to compute the last value, or if the
3566 sequence if empty, and 1 otherwise. */
3569 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3570 gfc_expr *stride, mpz_t last)
3574 if (start == NULL || start->expr_type != EXPR_CONSTANT
3575 || end == NULL || end->expr_type != EXPR_CONSTANT
3576 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3579 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3580 || (stride != NULL && stride->ts.type != BT_INTEGER))
3583 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3585 if (compare_bound (start, end) == CMP_GT)
3587 mpz_set (last, end->value.integer);
3591 if (compare_bound_int (stride, 0) == CMP_GT)
3593 /* Stride is positive */
3594 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3599 /* Stride is negative */
3600 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3605 mpz_sub (rem, end->value.integer, start->value.integer);
3606 mpz_tdiv_r (rem, rem, stride->value.integer);
3607 mpz_sub (last, end->value.integer, rem);
3614 /* Compare a single dimension of an array reference to the array
3618 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3622 /* Given start, end and stride values, calculate the minimum and
3623 maximum referenced indexes. */
3625 switch (ar->dimen_type[i])
3631 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3633 gfc_warning ("Array reference at %L is out of bounds "
3634 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3635 mpz_get_si (ar->start[i]->value.integer),
3636 mpz_get_si (as->lower[i]->value.integer), i+1);
3639 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3641 gfc_warning ("Array reference at %L is out of bounds "
3642 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3643 mpz_get_si (ar->start[i]->value.integer),
3644 mpz_get_si (as->upper[i]->value.integer), i+1);
3652 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3653 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3655 comparison comp_start_end = compare_bound (AR_START, AR_END);
3657 /* Check for zero stride, which is not allowed. */
3658 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3660 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3664 /* if start == len || (stride > 0 && start < len)
3665 || (stride < 0 && start > len),
3666 then the array section contains at least one element. In this
3667 case, there is an out-of-bounds access if
3668 (start < lower || start > upper). */
3669 if (compare_bound (AR_START, AR_END) == CMP_EQ
3670 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3671 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3672 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3673 && comp_start_end == CMP_GT))
3675 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3677 gfc_warning ("Lower array reference at %L is out of bounds "
3678 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3679 mpz_get_si (AR_START->value.integer),
3680 mpz_get_si (as->lower[i]->value.integer), i+1);
3683 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3685 gfc_warning ("Lower array reference at %L is out of bounds "
3686 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3687 mpz_get_si (AR_START->value.integer),
3688 mpz_get_si (as->upper[i]->value.integer), i+1);
3693 /* If we can compute the highest index of the array section,
3694 then it also has to be between lower and upper. */
3695 mpz_init (last_value);
3696 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3699 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3701 gfc_warning ("Upper array reference at %L is out of bounds "
3702 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3703 mpz_get_si (last_value),
3704 mpz_get_si (as->lower[i]->value.integer), i+1);
3705 mpz_clear (last_value);
3708 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3710 gfc_warning ("Upper array reference at %L is out of bounds "
3711 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3712 mpz_get_si (last_value),
3713 mpz_get_si (as->upper[i]->value.integer), i+1);
3714 mpz_clear (last_value);
3718 mpz_clear (last_value);
3726 gfc_internal_error ("check_dimension(): Bad array reference");
3733 /* Compare an array reference with an array specification. */
3736 compare_spec_to_ref (gfc_array_ref *ar)
3743 /* TODO: Full array sections are only allowed as actual parameters. */
3744 if (as->type == AS_ASSUMED_SIZE
3745 && (/*ar->type == AR_FULL
3746 ||*/ (ar->type == AR_SECTION
3747 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3749 gfc_error ("Rightmost upper bound of assumed size array section "
3750 "not specified at %L", &ar->where);
3754 if (ar->type == AR_FULL)
3757 if (as->rank != ar->dimen)
3759 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3760 &ar->where, ar->dimen, as->rank);
3764 for (i = 0; i < as->rank; i++)
3765 if (check_dimension (i, ar, as) == FAILURE)
3772 /* Resolve one part of an array index. */
3775 gfc_resolve_index (gfc_expr *index, int check_scalar)
3782 if (gfc_resolve_expr (index) == FAILURE)
3785 if (check_scalar && index->rank != 0)
3787 gfc_error ("Array index at %L must be scalar", &index->where);
3791 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3793 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3794 &index->where, gfc_basic_typename (index->ts.type));
3798 if (index->ts.type == BT_REAL)
3799 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3800 &index->where) == FAILURE)
3803 if (index->ts.kind != gfc_index_integer_kind
3804 || index->ts.type != BT_INTEGER)
3807 ts.type = BT_INTEGER;
3808 ts.kind = gfc_index_integer_kind;
3810 gfc_convert_type_warn (index, &ts, 2, 0);
3816 /* Resolve a dim argument to an intrinsic function. */
3819 gfc_resolve_dim_arg (gfc_expr *dim)
3824 if (gfc_resolve_expr (dim) == FAILURE)
3829 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3834 if (dim->ts.type != BT_INTEGER)
3836 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3840 if (dim->ts.kind != gfc_index_integer_kind)
3844 ts.type = BT_INTEGER;
3845 ts.kind = gfc_index_integer_kind;
3847 gfc_convert_type_warn (dim, &ts, 2, 0);
3853 /* Given an expression that contains array references, update those array
3854 references to point to the right array specifications. While this is
3855 filled in during matching, this information is difficult to save and load
3856 in a module, so we take care of it here.
3858 The idea here is that the original array reference comes from the
3859 base symbol. We traverse the list of reference structures, setting
3860 the stored reference to references. Component references can
3861 provide an additional array specification. */
3864 find_array_spec (gfc_expr *e)
3868 gfc_symbol *derived;
3871 as = e->symtree->n.sym->as;
3874 for (ref = e->ref; ref; ref = ref->next)
3879 gfc_internal_error ("find_array_spec(): Missing spec");
3886 if (derived == NULL)
3887 derived = e->symtree->n.sym->ts.derived;
3889 c = derived->components;
3891 for (; c; c = c->next)
3892 if (c == ref->u.c.component)
3894 /* Track the sequence of component references. */
3895 if (c->ts.type == BT_DERIVED)
3896 derived = c->ts.derived;
3901 gfc_internal_error ("find_array_spec(): Component not found");
3903 if (c->attr.dimension)
3906 gfc_internal_error ("find_array_spec(): unused as(1)");
3917 gfc_internal_error ("find_array_spec(): unused as(2)");
3921 /* Resolve an array reference. */
3924 resolve_array_ref (gfc_array_ref *ar)
3926 int i, check_scalar;
3929 for (i = 0; i < ar->dimen; i++)
3931 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3933 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3935 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3937 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3942 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3946 ar->dimen_type[i] = DIMEN_ELEMENT;
3950 ar->dimen_type[i] = DIMEN_VECTOR;
3951 if (e->expr_type == EXPR_VARIABLE
3952 && e->symtree->n.sym->ts.type == BT_DERIVED)
3953 ar->start[i] = gfc_get_parentheses (e);
3957 gfc_error ("Array index at %L is an array of rank %d",
3958 &ar->c_where[i], e->rank);
3963 /* If the reference type is unknown, figure out what kind it is. */
3965 if (ar->type == AR_UNKNOWN)
3967 ar->type = AR_ELEMENT;
3968 for (i = 0; i < ar->dimen; i++)
3969 if (ar->dimen_type[i] == DIMEN_RANGE
3970 || ar->dimen_type[i] == DIMEN_VECTOR)
3972 ar->type = AR_SECTION;
3977 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
3985 resolve_substring (gfc_ref *ref)
3987 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
3989 if (ref->u.ss.start != NULL)
3991 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
3994 if (ref->u.ss.start->ts.type != BT_INTEGER)
3996 gfc_error ("Substring start index at %L must be of type INTEGER",
3997 &ref->u.ss.start->where);
4001 if (ref->u.ss.start->rank != 0)
4003 gfc_error ("Substring start index at %L must be scalar",
4004 &ref->u.ss.start->where);
4008 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4009 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4010 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4012 gfc_error ("Substring start index at %L is less than one",
4013 &ref->u.ss.start->where);
4018 if (ref->u.ss.end != NULL)
4020 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4023 if (ref->u.ss.end->ts.type != BT_INTEGER)
4025 gfc_error ("Substring end index at %L must be of type INTEGER",
4026 &ref->u.ss.end->where);
4030 if (ref->u.ss.end->rank != 0)
4032 gfc_error ("Substring end index at %L must be scalar",
4033 &ref->u.ss.end->where);
4037 if (ref->u.ss.length != NULL
4038 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4039 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4040 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4042 gfc_error ("Substring end index at %L exceeds the string length",
4043 &ref->u.ss.start->where);
4047 if (compare_bound_mpz_t (ref->u.ss.end,
4048 gfc_integer_kinds[k].huge) == CMP_GT
4049 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4050 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4052 gfc_error ("Substring end index at %L is too large",
4053 &ref->u.ss.end->where);
4062 /* This function supplies missing substring charlens. */
4065 gfc_resolve_substring_charlen (gfc_expr *e)
4068 gfc_expr *start, *end;
4070 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4071 if (char_ref->type == REF_SUBSTRING)
4077 gcc_assert (char_ref->next == NULL);
4081 if (e->ts.cl->length)
4082 gfc_free_expr (e->ts.cl->length);
4083 else if (e->expr_type == EXPR_VARIABLE
4084 && e->symtree->n.sym->attr.dummy)
4088 e->ts.type = BT_CHARACTER;
4089 e->ts.kind = gfc_default_character_kind;
4092 e->ts.cl = gfc_new_charlen (gfc_current_ns);
4094 if (char_ref->u.ss.start)
4095 start = gfc_copy_expr (char_ref->u.ss.start);
4097 start = gfc_int_expr (1);
4099 if (char_ref->u.ss.end)
4100 end = gfc_copy_expr (char_ref->u.ss.end);
4101 else if (e->expr_type == EXPR_VARIABLE)
4102 end = gfc_copy_expr (e->symtree->n.sym->ts.cl->length);
4109 /* Length = (end - start +1). */
4110 e->ts.cl->length = gfc_subtract (end, start);
4111 e->ts.cl->length = gfc_add (e->ts.cl->length, gfc_int_expr (1));
4113 e->ts.cl->length->ts.type = BT_INTEGER;
4114 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4116 /* Make sure that the length is simplified. */
4117 gfc_simplify_expr (e->ts.cl->length, 1);
4118 gfc_resolve_expr (e->ts.cl->length);
4122 /* Resolve subtype references. */
4125 resolve_ref (gfc_expr *expr)
4127 int current_part_dimension, n_components, seen_part_dimension;
4130 for (ref = expr->ref; ref; ref = ref->next)
4131 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4133 find_array_spec (expr);
4137 for (ref = expr->ref; ref; ref = ref->next)
4141 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4149 resolve_substring (ref);
4153 /* Check constraints on part references. */
4155 current_part_dimension = 0;
4156 seen_part_dimension = 0;
4159 for (ref = expr->ref; ref; ref = ref->next)
4164 switch (ref->u.ar.type)
4168 current_part_dimension = 1;
4172 current_part_dimension = 0;
4176 gfc_internal_error ("resolve_ref(): Bad array reference");
4182 if (current_part_dimension || seen_part_dimension)
4184 if (ref->u.c.component->attr.pointer)
4186 gfc_error ("Component to the right of a part reference "
4187 "with nonzero rank must not have the POINTER "
4188 "attribute at %L", &expr->where);
4191 else if (ref->u.c.component->attr.allocatable)
4193 gfc_error ("Component to the right of a part reference "
4194 "with nonzero rank must not have the ALLOCATABLE "
4195 "attribute at %L", &expr->where);
4207 if (((ref->type == REF_COMPONENT && n_components > 1)
4208 || ref->next == NULL)
4209 && current_part_dimension
4210 && seen_part_dimension)
4212 gfc_error ("Two or more part references with nonzero rank must "
4213 "not be specified at %L", &expr->where);
4217 if (ref->type == REF_COMPONENT)
4219 if (current_part_dimension)
4220 seen_part_dimension = 1;
4222 /* reset to make sure */
4223 current_part_dimension = 0;
4231 /* Given an expression, determine its shape. This is easier than it sounds.
4232 Leaves the shape array NULL if it is not possible to determine the shape. */
4235 expression_shape (gfc_expr *e)
4237 mpz_t array[GFC_MAX_DIMENSIONS];
4240 if (e->rank == 0 || e->shape != NULL)
4243 for (i = 0; i < e->rank; i++)
4244 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4247 e->shape = gfc_get_shape (e->rank);
4249 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4254 for (i--; i >= 0; i--)
4255 mpz_clear (array[i]);
4259 /* Given a variable expression node, compute the rank of the expression by
4260 examining the base symbol and any reference structures it may have. */
4263 expression_rank (gfc_expr *e)
4268 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4269 could lead to serious confusion... */
4270 gcc_assert (e->expr_type != EXPR_COMPCALL);
4274 if (e->expr_type == EXPR_ARRAY)
4276 /* Constructors can have a rank different from one via RESHAPE(). */
4278 if (e->symtree == NULL)
4284 e->rank = (e->symtree->n.sym->as == NULL)
4285 ? 0 : e->symtree->n.sym->as->rank;
4291 for (ref = e->ref; ref; ref = ref->next)
4293 if (ref->type != REF_ARRAY)
4296 if (ref->u.ar.type == AR_FULL)
4298 rank = ref->u.ar.as->rank;
4302 if (ref->u.ar.type == AR_SECTION)
4304 /* Figure out the rank of the section. */
4306 gfc_internal_error ("expression_rank(): Two array specs");
4308 for (i = 0; i < ref->u.ar.dimen; i++)
4309 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4310 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4320 expression_shape (e);
4324 /* Resolve a variable expression. */
4327 resolve_variable (gfc_expr *e)
4334 if (e->symtree == NULL)
4337 if (e->ref && resolve_ref (e) == FAILURE)
4340 sym = e->symtree->n.sym;
4341 if (sym->attr.flavor == FL_PROCEDURE
4342 && (!sym->attr.function
4343 || (sym->attr.function && sym->result
4344 && sym->result->attr.proc_pointer
4345 && !sym->result->attr.function)))
4347 e->ts.type = BT_PROCEDURE;
4348 goto resolve_procedure;
4351 if (sym->ts.type != BT_UNKNOWN)
4352 gfc_variable_attr (e, &e->ts);
4355 /* Must be a simple variable reference. */
4356 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4361 if (check_assumed_size_reference (sym, e))
4364 /* Deal with forward references to entries during resolve_code, to
4365 satisfy, at least partially, 12.5.2.5. */
4366 if (gfc_current_ns->entries
4367 && current_entry_id == sym->entry_id
4370 && cs_base->current->op != EXEC_ENTRY)
4372 gfc_entry_list *entry;
4373 gfc_formal_arglist *formal;
4377 /* If the symbol is a dummy... */
4378 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4380 entry = gfc_current_ns->entries;
4383 /* ...test if the symbol is a parameter of previous entries. */
4384 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4385 for (formal = entry->sym->formal; formal; formal = formal->next)
4387 if (formal->sym && sym->name == formal->sym->name)
4391 /* If it has not been seen as a dummy, this is an error. */
4394 if (specification_expr)
4395 gfc_error ("Variable '%s', used in a specification expression"
4396 ", is referenced at %L before the ENTRY statement "
4397 "in which it is a parameter",
4398 sym->name, &cs_base->current->loc);
4400 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4401 "statement in which it is a parameter",
4402 sym->name, &cs_base->current->loc);
4407 /* Now do the same check on the specification expressions. */
4408 specification_expr = 1;
4409 if (sym->ts.type == BT_CHARACTER
4410 && gfc_resolve_expr (sym->ts.cl->length) == FAILURE)
4414 for (n = 0; n < sym->as->rank; n++)
4416 specification_expr = 1;
4417 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4419 specification_expr = 1;
4420 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4423 specification_expr = 0;
4426 /* Update the symbol's entry level. */
4427 sym->entry_id = current_entry_id + 1;
4431 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4438 /* Checks to see that the correct symbol has been host associated.
4439 The only situation where this arises is that in which a twice
4440 contained function is parsed after the host association is made.
4441 Therefore, on detecting this, change the symbol in the expression
4442 and convert the array reference into an actual arglist if the old
4443 symbol is a variable. */
4445 check_host_association (gfc_expr *e)
4447 gfc_symbol *sym, *old_sym;
4451 gfc_actual_arglist *arg, *tail = NULL;
4452 bool retval = e->expr_type == EXPR_FUNCTION;
4454 /* If the expression is the result of substitution in
4455 interface.c(gfc_extend_expr) because there is no way in
4456 which the host association can be wrong. */
4457 if (e->symtree == NULL
4458 || e->symtree->n.sym == NULL
4459 || e->user_operator)
4462 old_sym = e->symtree->n.sym;
4464 if (gfc_current_ns->parent
4465 && old_sym->ns != gfc_current_ns)
4467 /* Use the 'USE' name so that renamed module symbols are
4468 correctly handled. */
4469 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4471 if (sym && old_sym != sym
4472 && sym->ts.type == old_sym->ts.type
4473 && sym->attr.flavor == FL_PROCEDURE
4474 && sym->attr.contained)
4476 /* Clear the shape, since it might not be valid. */
4477 if (e->shape != NULL)
4479 for (n = 0; n < e->rank; n++)
4480 mpz_clear (e->shape[n]);
4482 gfc_free (e->shape);
4485 /* Give the expression the right symtree! */
4486 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4487 gcc_assert (st != NULL);
4489 if (old_sym->attr.flavor == FL_PROCEDURE
4490 || e->expr_type == EXPR_FUNCTION)
4492 /* Original was function so point to the new symbol, since
4493 the actual argument list is already attached to the
4495 e->value.function.esym = NULL;
4500 /* Original was variable so convert array references into
4501 an actual arglist. This does not need any checking now
4502 since gfc_resolve_function will take care of it. */
4503 e->value.function.actual = NULL;
4504 e->expr_type = EXPR_FUNCTION;
4507 /* Ambiguity will not arise if the array reference is not
4508 the last reference. */
4509 for (ref = e->ref; ref; ref = ref->next)
4510 if (ref->type == REF_ARRAY && ref->next == NULL)
4513 gcc_assert (ref->type == REF_ARRAY);
4515 /* Grab the start expressions from the array ref and
4516 copy them into actual arguments. */
4517 for (n = 0; n < ref->u.ar.dimen; n++)
4519 arg = gfc_get_actual_arglist ();
4520 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4521 if (e->value.function.actual == NULL)
4522 tail = e->value.function.actual = arg;
4530 /* Dump the reference list and set the rank. */
4531 gfc_free_ref_list (e->ref);
4533 e->rank = sym->as ? sym->as->rank : 0;
4536 gfc_resolve_expr (e);
4540 /* This might have changed! */
4541 return e->expr_type == EXPR_FUNCTION;
4546 gfc_resolve_character_operator (gfc_expr *e)
4548 gfc_expr *op1 = e->value.op.op1;
4549 gfc_expr *op2 = e->value.op.op2;
4550 gfc_expr *e1 = NULL;
4551 gfc_expr *e2 = NULL;
4553 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4555 if (op1->ts.cl && op1->ts.cl->length)
4556 e1 = gfc_copy_expr (op1->ts.cl->length);
4557 else if (op1->expr_type == EXPR_CONSTANT)
4558 e1 = gfc_int_expr (op1->value.character.length);
4560 if (op2->ts.cl && op2->ts.cl->length)
4561 e2 = gfc_copy_expr (op2->ts.cl->length);
4562 else if (op2->expr_type == EXPR_CONSTANT)
4563 e2 = gfc_int_expr (op2->value.character.length);
4565 e->ts.cl = gfc_new_charlen (gfc_current_ns);
4570 e->ts.cl->length = gfc_add (e1, e2);
4571 e->ts.cl->length->ts.type = BT_INTEGER;
4572 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;
4573 gfc_simplify_expr (e->ts.cl->length, 0);
4574 gfc_resolve_expr (e->ts.cl->length);
4580 /* Ensure that an character expression has a charlen and, if possible, a
4581 length expression. */
4584 fixup_charlen (gfc_expr *e)
4586 /* The cases fall through so that changes in expression type and the need
4587 for multiple fixes are picked up. In all circumstances, a charlen should
4588 be available for the middle end to hang a backend_decl on. */
4589 switch (e->expr_type)
4592 gfc_resolve_character_operator (e);
4595 if (e->expr_type == EXPR_ARRAY)
4596 gfc_resolve_character_array_constructor (e);
4598 case EXPR_SUBSTRING:
4599 if (!e->ts.cl && e->ref)
4600 gfc_resolve_substring_charlen (e);
4604 e->ts.cl = gfc_new_charlen (gfc_current_ns);
4611 /* Update an actual argument to include the passed-object for type-bound
4612 procedures at the right position. */
4614 static gfc_actual_arglist*
4615 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4618 gcc_assert (argpos > 0);
4622 gfc_actual_arglist* result;
4624 result = gfc_get_actual_arglist ();
4628 result->name = name;
4634 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4636 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4641 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4644 extract_compcall_passed_object (gfc_expr* e)
4648 gcc_assert (e->expr_type == EXPR_COMPCALL);
4650 po = gfc_get_expr ();
4651 po->expr_type = EXPR_VARIABLE;
4652 po->symtree = e->symtree;
4653 po->ref = gfc_copy_ref (e->ref);
4655 if (gfc_resolve_expr (po) == FAILURE)
4662 /* Update the arglist of an EXPR_COMPCALL expression to include the
4666 update_compcall_arglist (gfc_expr* e)
4669 gfc_typebound_proc* tbp;
4671 tbp = e->value.compcall.tbp;
4676 po = extract_compcall_passed_object (e);
4682 gfc_error ("Passed-object at %L must be scalar", &e->where);
4692 gcc_assert (tbp->pass_arg_num > 0);
4693 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4701 /* Extract the passed object from a PPC call (a copy of it). */
4704 extract_ppc_passed_object (gfc_expr *e)
4709 po = gfc_get_expr ();
4710 po->expr_type = EXPR_VARIABLE;
4711 po->symtree = e->symtree;
4712 po->ref = gfc_copy_ref (e->ref);
4714 /* Remove PPC reference. */
4716 while ((*ref)->next)
4717 (*ref) = (*ref)->next;
4718 gfc_free_ref_list (*ref);
4721 if (gfc_resolve_expr (po) == FAILURE)
4728 /* Update the actual arglist of a procedure pointer component to include the
4732 update_ppc_arglist (gfc_expr* e)
4736 gfc_typebound_proc* tb;
4738 if (!gfc_is_proc_ptr_comp (e, &ppc))
4745 else if (tb->nopass)
4748 po = extract_ppc_passed_object (e);
4754 gfc_error ("Passed-object at %L must be scalar", &e->where);
4758 gcc_assert (tb->pass_arg_num > 0);
4759 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4767 /* Check that the object a TBP is called on is valid, i.e. it must not be
4768 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4771 check_typebound_baseobject (gfc_expr* e)
4775 base = extract_compcall_passed_object (e);
4779 gcc_assert (base->ts.type == BT_DERIVED);
4780 if (base->ts.derived->attr.abstract)
4782 gfc_error ("Base object for type-bound procedure call at %L is of"
4783 " ABSTRACT type '%s'", &e->where, base->ts.derived->name);
4791 /* Resolve a call to a type-bound procedure, either function or subroutine,
4792 statically from the data in an EXPR_COMPCALL expression. The adapted
4793 arglist and the target-procedure symtree are returned. */
4796 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4797 gfc_actual_arglist** actual)
4799 gcc_assert (e->expr_type == EXPR_COMPCALL);
4800 gcc_assert (!e->value.compcall.tbp->is_generic);
4802 /* Update the actual arglist for PASS. */
4803 if (update_compcall_arglist (e) == FAILURE)
4806 *actual = e->value.compcall.actual;
4807 *target = e->value.compcall.tbp->u.specific;
4809 gfc_free_ref_list (e->ref);
4811 e->value.compcall.actual = NULL;
4817 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4818 which of the specific bindings (if any) matches the arglist and transform
4819 the expression into a call of that binding. */
4822 resolve_typebound_generic_call (gfc_expr* e)
4824 gfc_typebound_proc* genproc;
4825 const char* genname;
4827 gcc_assert (e->expr_type == EXPR_COMPCALL);
4828 genname = e->value.compcall.name;
4829 genproc = e->value.compcall.tbp;
4831 if (!genproc->is_generic)
4834 /* Try the bindings on this type and in the inheritance hierarchy. */
4835 for (; genproc; genproc = genproc->overridden)
4839 gcc_assert (genproc->is_generic);
4840 for (g = genproc->u.generic; g; g = g->next)
4843 gfc_actual_arglist* args;
4846 gcc_assert (g->specific);
4848 if (g->specific->error)
4851 target = g->specific->u.specific->n.sym;
4853 /* Get the right arglist by handling PASS/NOPASS. */
4854 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4855 if (!g->specific->nopass)
4858 po = extract_compcall_passed_object (e);
4862 gcc_assert (g->specific->pass_arg_num > 0);
4863 gcc_assert (!g->specific->error);
4864 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
4865 g->specific->pass_arg);
4867 resolve_actual_arglist (args, target->attr.proc,
4868 is_external_proc (target) && !target->formal);
4870 /* Check if this arglist matches the formal. */
4871 matches = gfc_arglist_matches_symbol (&args, target);
4873 /* Clean up and break out of the loop if we've found it. */
4874 gfc_free_actual_arglist (args);
4877 e->value.compcall.tbp = g->specific;
4883 /* Nothing matching found! */
4884 gfc_error ("Found no matching specific binding for the call to the GENERIC"
4885 " '%s' at %L", genname, &e->where);
4893 /* Resolve a call to a type-bound subroutine. */
4896 resolve_typebound_call (gfc_code* c)
4898 gfc_actual_arglist* newactual;
4899 gfc_symtree* target;
4901 /* Check that's really a SUBROUTINE. */
4902 if (!c->expr1->value.compcall.tbp->subroutine)
4904 gfc_error ("'%s' at %L should be a SUBROUTINE",
4905 c->expr1->value.compcall.name, &c->loc);
4909 if (check_typebound_baseobject (c->expr1) == FAILURE)
4912 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
4915 /* Transform into an ordinary EXEC_CALL for now. */
4917 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
4920 c->ext.actual = newactual;
4921 c->symtree = target;
4924 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
4925 gfc_free_expr (c->expr1);
4928 return resolve_call (c);
4932 /* Resolve a component-call expression. */
4935 resolve_compcall (gfc_expr* e)
4937 gfc_actual_arglist* newactual;
4938 gfc_symtree* target;
4940 /* Check that's really a FUNCTION. */
4941 if (!e->value.compcall.tbp->function)
4943 gfc_error ("'%s' at %L should be a FUNCTION",
4944 e->value.compcall.name, &e->where);
4948 if (check_typebound_baseobject (e) == FAILURE)
4951 if (resolve_typebound_generic_call (e) == FAILURE)
4953 gcc_assert (!e->value.compcall.tbp->is_generic);
4955 /* Take the rank from the function's symbol. */
4956 if (e->value.compcall.tbp->u.specific->n.sym->as)
4957 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
4959 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
4960 arglist to the TBP's binding target. */
4962 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
4965 e->value.function.actual = newactual;
4966 e->value.function.name = e->value.compcall.name;
4967 e->value.function.esym = target->n.sym;
4968 e->value.function.isym = NULL;
4969 e->symtree = target;
4970 e->ts = target->n.sym->ts;
4971 e->expr_type = EXPR_FUNCTION;
4973 return gfc_resolve_expr (e);
4977 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
4980 resolve_ppc_call (gfc_code* c)
4982 gfc_component *comp;
4983 gcc_assert (gfc_is_proc_ptr_comp (c->expr1, &comp));
4985 c->resolved_sym = c->expr1->symtree->n.sym;
4986 c->expr1->expr_type = EXPR_VARIABLE;
4988 if (!comp->attr.subroutine)
4989 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
4991 if (resolve_ref (c->expr1) == FAILURE)
4994 if (update_ppc_arglist (c->expr1) == FAILURE)
4997 c->ext.actual = c->expr1->value.compcall.actual;
4999 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5000 comp->formal == NULL) == FAILURE)
5003 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5009 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5012 resolve_expr_ppc (gfc_expr* e)
5014 gfc_component *comp;
5015 gcc_assert (gfc_is_proc_ptr_comp (e, &comp));
5017 /* Convert to EXPR_FUNCTION. */
5018 e->expr_type = EXPR_FUNCTION;
5019 e->value.function.isym = NULL;
5020 e->value.function.actual = e->value.compcall.actual;
5022 if (comp->as != NULL)
5023 e->rank = comp->as->rank;
5025 if (!comp->attr.function)
5026 gfc_add_function (&comp->attr, comp->name, &e->where);
5028 if (resolve_ref (e) == FAILURE)
5031 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5032 comp->formal == NULL) == FAILURE)
5035 if (update_ppc_arglist (e) == FAILURE)
5038 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5044 /* Resolve an expression. That is, make sure that types of operands agree
5045 with their operators, intrinsic operators are converted to function calls
5046 for overloaded types and unresolved function references are resolved. */
5049 gfc_resolve_expr (gfc_expr *e)
5056 switch (e->expr_type)
5059 t = resolve_operator (e);
5065 if (check_host_association (e))
5066 t = resolve_function (e);
5069 t = resolve_variable (e);
5071 expression_rank (e);
5074 if (e->ts.type == BT_CHARACTER && e->ts.cl == NULL && e->ref
5075 && e->ref->type != REF_SUBSTRING)
5076 gfc_resolve_substring_charlen (e);
5081 t = resolve_compcall (e);
5084 case EXPR_SUBSTRING:
5085 t = resolve_ref (e);
5094 t = resolve_expr_ppc (e);
5099 if (resolve_ref (e) == FAILURE)
5102 t = gfc_resolve_array_constructor (e);
5103 /* Also try to expand a constructor. */
5106 expression_rank (e);
5107 gfc_expand_constructor (e);
5110 /* This provides the opportunity for the length of constructors with
5111 character valued function elements to propagate the string length
5112 to the expression. */
5113 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5114 t = gfc_resolve_character_array_constructor (e);
5118 case EXPR_STRUCTURE:
5119 t = resolve_ref (e);
5123 t = resolve_structure_cons (e);
5127 t = gfc_simplify_expr (e, 0);
5131 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5134 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.cl)
5141 /* Resolve an expression from an iterator. They must be scalar and have
5142 INTEGER or (optionally) REAL type. */
5145 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5146 const char *name_msgid)
5148 if (gfc_resolve_expr (expr) == FAILURE)
5151 if (expr->rank != 0)
5153 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5157 if (expr->ts.type != BT_INTEGER)
5159 if (expr->ts.type == BT_REAL)
5162 return gfc_notify_std (GFC_STD_F95_DEL,
5163 "Deleted feature: %s at %L must be integer",
5164 _(name_msgid), &expr->where);
5167 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5174 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5182 /* Resolve the expressions in an iterator structure. If REAL_OK is
5183 false allow only INTEGER type iterators, otherwise allow REAL types. */
5186 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5188 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5192 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5194 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5199 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5200 "Start expression in DO loop") == FAILURE)
5203 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5204 "End expression in DO loop") == FAILURE)
5207 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5208 "Step expression in DO loop") == FAILURE)
5211 if (iter->step->expr_type == EXPR_CONSTANT)
5213 if ((iter->step->ts.type == BT_INTEGER
5214 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5215 || (iter->step->ts.type == BT_REAL
5216 && mpfr_sgn (iter->step->value.real) == 0))
5218 gfc_error ("Step expression in DO loop at %L cannot be zero",
5219 &iter->step->where);
5224 /* Convert start, end, and step to the same type as var. */
5225 if (iter->start->ts.kind != iter->var->ts.kind
5226 || iter->start->ts.type != iter->var->ts.type)
5227 gfc_convert_type (iter->start, &iter->var->ts, 2);
5229 if (iter->end->ts.kind != iter->var->ts.kind
5230 || iter->end->ts.type != iter->var->ts.type)
5231 gfc_convert_type (iter->end, &iter->var->ts, 2);
5233 if (iter->step->ts.kind != iter->var->ts.kind
5234 || iter->step->ts.type != iter->var->ts.type)
5235 gfc_convert_type (iter->step, &iter->var->ts, 2);
5237 if (iter->start->expr_type == EXPR_CONSTANT
5238 && iter->end->expr_type == EXPR_CONSTANT
5239 && iter->step->expr_type == EXPR_CONSTANT)
5242 if (iter->start->ts.type == BT_INTEGER)
5244 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5245 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5249 sgn = mpfr_sgn (iter->step->value.real);
5250 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5252 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5253 gfc_warning ("DO loop at %L will be executed zero times",
5254 &iter->step->where);
5261 /* Traversal function for find_forall_index. f == 2 signals that
5262 that variable itself is not to be checked - only the references. */
5265 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5267 if (expr->expr_type != EXPR_VARIABLE)
5270 /* A scalar assignment */
5271 if (!expr->ref || *f == 1)
5273 if (expr->symtree->n.sym == sym)
5285 /* Check whether the FORALL index appears in the expression or not.
5286 Returns SUCCESS if SYM is found in EXPR. */
5289 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5291 if (gfc_traverse_expr (expr, sym, forall_index, f))
5298 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5299 to be a scalar INTEGER variable. The subscripts and stride are scalar
5300 INTEGERs, and if stride is a constant it must be nonzero.
5301 Furthermore "A subscript or stride in a forall-triplet-spec shall
5302 not contain a reference to any index-name in the
5303 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5306 resolve_forall_iterators (gfc_forall_iterator *it)
5308 gfc_forall_iterator *iter, *iter2;
5310 for (iter = it; iter; iter = iter->next)
5312 if (gfc_resolve_expr (iter->var) == SUCCESS
5313 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5314 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5317 if (gfc_resolve_expr (iter->start) == SUCCESS
5318 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5319 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5320 &iter->start->where);
5321 if (iter->var->ts.kind != iter->start->ts.kind)
5322 gfc_convert_type (iter->start, &iter->var->ts, 2);
5324 if (gfc_resolve_expr (iter->end) == SUCCESS
5325 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5326 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5328 if (iter->var->ts.kind != iter->end->ts.kind)
5329 gfc_convert_type (iter->end, &iter->var->ts, 2);
5331 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5333 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5334 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5335 &iter->stride->where, "INTEGER");
5337 if (iter->stride->expr_type == EXPR_CONSTANT
5338 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5339 gfc_error ("FORALL stride expression at %L cannot be zero",
5340 &iter->stride->where);
5342 if (iter->var->ts.kind != iter->stride->ts.kind)
5343 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5346 for (iter = it; iter; iter = iter->next)
5347 for (iter2 = iter; iter2; iter2 = iter2->next)
5349 if (find_forall_index (iter2->start,
5350 iter->var->symtree->n.sym, 0) == SUCCESS
5351 || find_forall_index (iter2->end,
5352 iter->var->symtree->n.sym, 0) == SUCCESS
5353 || find_forall_index (iter2->stride,
5354 iter->var->symtree->n.sym, 0) == SUCCESS)
5355 gfc_error ("FORALL index '%s' may not appear in triplet "
5356 "specification at %L", iter->var->symtree->name,
5357 &iter2->start->where);
5362 /* Given a pointer to a symbol that is a derived type, see if it's
5363 inaccessible, i.e. if it's defined in another module and the components are
5364 PRIVATE. The search is recursive if necessary. Returns zero if no
5365 inaccessible components are found, nonzero otherwise. */
5368 derived_inaccessible (gfc_symbol *sym)
5372 if (sym->attr.use_assoc && sym->attr.private_comp)
5375 for (c = sym->components; c; c = c->next)
5377 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.derived))
5385 /* Resolve the argument of a deallocate expression. The expression must be
5386 a pointer or a full array. */
5389 resolve_deallocate_expr (gfc_expr *e)
5391 symbol_attribute attr;
5392 int allocatable, pointer, check_intent_in;
5395 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5396 check_intent_in = 1;
5398 if (gfc_resolve_expr (e) == FAILURE)
5401 if (e->expr_type != EXPR_VARIABLE)
5404 allocatable = e->symtree->n.sym->attr.allocatable;
5405 pointer = e->symtree->n.sym->attr.pointer;
5406 for (ref = e->ref; ref; ref = ref->next)
5409 check_intent_in = 0;
5414 if (ref->u.ar.type != AR_FULL)
5419 allocatable = (ref->u.c.component->as != NULL
5420 && ref->u.c.component->as->type == AS_DEFERRED);
5421 pointer = ref->u.c.component->attr.pointer;
5430 attr = gfc_expr_attr (e);
5432 if (allocatable == 0 && attr.pointer == 0)
5435 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5440 && e->symtree->n.sym->attr.intent == INTENT_IN)
5442 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5443 e->symtree->n.sym->name, &e->where);
5451 /* Returns true if the expression e contains a reference to the symbol sym. */
5453 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5455 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5462 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5464 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5468 /* Given the expression node e for an allocatable/pointer of derived type to be
5469 allocated, get the expression node to be initialized afterwards (needed for
5470 derived types with default initializers, and derived types with allocatable
5471 components that need nullification.) */
5474 expr_to_initialize (gfc_expr *e)
5480 result = gfc_copy_expr (e);
5482 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5483 for (ref = result->ref; ref; ref = ref->next)
5484 if (ref->type == REF_ARRAY && ref->next == NULL)
5486 ref->u.ar.type = AR_FULL;
5488 for (i = 0; i < ref->u.ar.dimen; i++)
5489 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5491 result->rank = ref->u.ar.dimen;
5499 /* Resolve the expression in an ALLOCATE statement, doing the additional
5500 checks to see whether the expression is OK or not. The expression must
5501 have a trailing array reference that gives the size of the array. */
5504 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
5506 int i, pointer, allocatable, dimension, check_intent_in;
5507 symbol_attribute attr;
5508 gfc_ref *ref, *ref2;
5515 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5516 check_intent_in = 1;
5518 if (gfc_resolve_expr (e) == FAILURE)
5521 /* Make sure the expression is allocatable or a pointer. If it is
5522 pointer, the next-to-last reference must be a pointer. */
5526 if (e->expr_type != EXPR_VARIABLE)
5529 attr = gfc_expr_attr (e);
5530 pointer = attr.pointer;
5531 dimension = attr.dimension;
5535 allocatable = e->symtree->n.sym->attr.allocatable;
5536 pointer = e->symtree->n.sym->attr.pointer;
5537 dimension = e->symtree->n.sym->attr.dimension;
5539 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
5542 check_intent_in = 0;
5547 if (ref->next != NULL)
5552 allocatable = (ref->u.c.component->as != NULL
5553 && ref->u.c.component->as->type == AS_DEFERRED);
5555 pointer = ref->u.c.component->attr.pointer;
5556 dimension = ref->u.c.component->attr.dimension;
5567 if (allocatable == 0 && pointer == 0)
5569 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5575 && e->symtree->n.sym->attr.intent == INTENT_IN)
5577 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
5578 e->symtree->n.sym->name, &e->where);
5582 /* Add default initializer for those derived types that need them. */
5583 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
5585 init_st = gfc_get_code ();
5586 init_st->loc = code->loc;
5587 init_st->op = EXEC_INIT_ASSIGN;
5588 init_st->expr1 = expr_to_initialize (e);
5589 init_st->expr2 = init_e;
5590 init_st->next = code->next;
5591 code->next = init_st;
5594 if (pointer && dimension == 0)
5597 /* Make sure the next-to-last reference node is an array specification. */
5599 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
5601 gfc_error ("Array specification required in ALLOCATE statement "
5602 "at %L", &e->where);
5606 /* Make sure that the array section reference makes sense in the
5607 context of an ALLOCATE specification. */
5611 for (i = 0; i < ar->dimen; i++)
5613 if (ref2->u.ar.type == AR_ELEMENT)
5616 switch (ar->dimen_type[i])
5622 if (ar->start[i] != NULL
5623 && ar->end[i] != NULL
5624 && ar->stride[i] == NULL)
5627 /* Fall Through... */
5631 gfc_error ("Bad array specification in ALLOCATE statement at %L",
5638 for (a = code->ext.alloc_list; a; a = a->next)
5640 sym = a->expr->symtree->n.sym;
5642 /* TODO - check derived type components. */
5643 if (sym->ts.type == BT_DERIVED)
5646 if ((ar->start[i] != NULL
5647 && gfc_find_sym_in_expr (sym, ar->start[i]))
5648 || (ar->end[i] != NULL
5649 && gfc_find_sym_in_expr (sym, ar->end[i])))
5651 gfc_error ("'%s' must not appear in the array specification at "
5652 "%L in the same ALLOCATE statement where it is "
5653 "itself allocated", sym->name, &ar->where);
5663 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
5665 gfc_expr *stat, *errmsg, *pe, *qe;
5666 gfc_alloc *a, *p, *q;
5668 stat = code->expr1 ? code->expr1 : NULL;
5670 errmsg = code->expr2 ? code->expr2 : NULL;
5672 /* Check the stat variable. */
5675 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
5676 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
5677 stat->symtree->n.sym->name, &stat->where);
5679 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
5680 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
5683 if (stat->ts.type != BT_INTEGER
5684 && !(stat->ref && (stat->ref->type == REF_ARRAY
5685 || stat->ref->type == REF_COMPONENT)))
5686 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
5687 "variable", &stat->where);
5689 for (p = code->ext.alloc_list; p; p = p->next)
5690 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
5691 gfc_error ("Stat-variable at %L shall not be %sd within "
5692 "the same %s statement", &stat->where, fcn, fcn);
5695 /* Check the errmsg variable. */
5699 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
5702 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
5703 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
5704 errmsg->symtree->n.sym->name, &errmsg->where);
5706 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
5707 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
5710 if (errmsg->ts.type != BT_CHARACTER
5712 && (errmsg->ref->type == REF_ARRAY
5713 || errmsg->ref->type == REF_COMPONENT)))
5714 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
5715 "variable", &errmsg->where);
5717 for (p = code->ext.alloc_list; p; p = p->next)
5718 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
5719 gfc_error ("Errmsg-variable at %L shall not be %sd within "
5720 "the same %s statement", &errmsg->where, fcn, fcn);
5723 /* Check that an allocate-object appears only once in the statement.
5724 FIXME: Checking derived types is disabled. */
5725 for (p = code->ext.alloc_list; p; p = p->next)
5728 if ((pe->ref && pe->ref->type != REF_COMPONENT)
5729 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
5731 for (q = p->next; q; q = q->next)
5734 if ((qe->ref && qe->ref->type != REF_COMPONENT)
5735 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
5736 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
5737 gfc_error ("Allocate-object at %L also appears at %L",
5738 &pe->where, &qe->where);
5743 if (strcmp (fcn, "ALLOCATE") == 0)
5745 for (a = code->ext.alloc_list; a; a = a->next)
5746 resolve_allocate_expr (a->expr, code);
5750 for (a = code->ext.alloc_list; a; a = a->next)
5751 resolve_deallocate_expr (a->expr);
5756 /************ SELECT CASE resolution subroutines ************/
5758 /* Callback function for our mergesort variant. Determines interval
5759 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
5760 op1 > op2. Assumes we're not dealing with the default case.
5761 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
5762 There are nine situations to check. */
5765 compare_cases (const gfc_case *op1, const gfc_case *op2)
5769 if (op1->low == NULL) /* op1 = (:L) */
5771 /* op2 = (:N), so overlap. */
5773 /* op2 = (M:) or (M:N), L < M */
5774 if (op2->low != NULL
5775 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5778 else if (op1->high == NULL) /* op1 = (K:) */
5780 /* op2 = (M:), so overlap. */
5782 /* op2 = (:N) or (M:N), K > N */
5783 if (op2->high != NULL
5784 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5787 else /* op1 = (K:L) */
5789 if (op2->low == NULL) /* op2 = (:N), K > N */
5790 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5792 else if (op2->high == NULL) /* op2 = (M:), L < M */
5793 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5795 else /* op2 = (M:N) */
5799 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
5802 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
5811 /* Merge-sort a double linked case list, detecting overlap in the
5812 process. LIST is the head of the double linked case list before it
5813 is sorted. Returns the head of the sorted list if we don't see any
5814 overlap, or NULL otherwise. */
5817 check_case_overlap (gfc_case *list)
5819 gfc_case *p, *q, *e, *tail;
5820 int insize, nmerges, psize, qsize, cmp, overlap_seen;
5822 /* If the passed list was empty, return immediately. */
5829 /* Loop unconditionally. The only exit from this loop is a return
5830 statement, when we've finished sorting the case list. */
5837 /* Count the number of merges we do in this pass. */
5840 /* Loop while there exists a merge to be done. */
5845 /* Count this merge. */
5848 /* Cut the list in two pieces by stepping INSIZE places
5849 forward in the list, starting from P. */
5852 for (i = 0; i < insize; i++)
5861 /* Now we have two lists. Merge them! */
5862 while (psize > 0 || (qsize > 0 && q != NULL))
5864 /* See from which the next case to merge comes from. */
5867 /* P is empty so the next case must come from Q. */
5872 else if (qsize == 0 || q == NULL)
5881 cmp = compare_cases (p, q);
5884 /* The whole case range for P is less than the
5892 /* The whole case range for Q is greater than
5893 the case range for P. */
5900 /* The cases overlap, or they are the same
5901 element in the list. Either way, we must
5902 issue an error and get the next case from P. */
5903 /* FIXME: Sort P and Q by line number. */
5904 gfc_error ("CASE label at %L overlaps with CASE "
5905 "label at %L", &p->where, &q->where);
5913 /* Add the next element to the merged list. */
5922 /* P has now stepped INSIZE places along, and so has Q. So
5923 they're the same. */
5928 /* If we have done only one merge or none at all, we've
5929 finished sorting the cases. */
5938 /* Otherwise repeat, merging lists twice the size. */
5944 /* Check to see if an expression is suitable for use in a CASE statement.
5945 Makes sure that all case expressions are scalar constants of the same
5946 type. Return FAILURE if anything is wrong. */
5949 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
5951 if (e == NULL) return SUCCESS;
5953 if (e->ts.type != case_expr->ts.type)
5955 gfc_error ("Expression in CASE statement at %L must be of type %s",
5956 &e->where, gfc_basic_typename (case_expr->ts.type));
5960 /* C805 (R808) For a given case-construct, each case-value shall be of
5961 the same type as case-expr. For character type, length differences
5962 are allowed, but the kind type parameters shall be the same. */
5964 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
5966 gfc_error ("Expression in CASE statement at %L must be of kind %d",
5967 &e->where, case_expr->ts.kind);
5971 /* Convert the case value kind to that of case expression kind, if needed.
5972 FIXME: Should a warning be issued? */
5973 if (e->ts.kind != case_expr->ts.kind)
5974 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
5978 gfc_error ("Expression in CASE statement at %L must be scalar",
5987 /* Given a completely parsed select statement, we:
5989 - Validate all expressions and code within the SELECT.
5990 - Make sure that the selection expression is not of the wrong type.
5991 - Make sure that no case ranges overlap.
5992 - Eliminate unreachable cases and unreachable code resulting from
5993 removing case labels.
5995 The standard does allow unreachable cases, e.g. CASE (5:3). But
5996 they are a hassle for code generation, and to prevent that, we just
5997 cut them out here. This is not necessary for overlapping cases
5998 because they are illegal and we never even try to generate code.
6000 We have the additional caveat that a SELECT construct could have
6001 been a computed GOTO in the source code. Fortunately we can fairly
6002 easily work around that here: The case_expr for a "real" SELECT CASE
6003 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6004 we have to do is make sure that the case_expr is a scalar integer
6008 resolve_select (gfc_code *code)
6011 gfc_expr *case_expr;
6012 gfc_case *cp, *default_case, *tail, *head;
6013 int seen_unreachable;
6019 if (code->expr1 == NULL)
6021 /* This was actually a computed GOTO statement. */
6022 case_expr = code->expr2;
6023 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6024 gfc_error ("Selection expression in computed GOTO statement "
6025 "at %L must be a scalar integer expression",
6028 /* Further checking is not necessary because this SELECT was built
6029 by the compiler, so it should always be OK. Just move the
6030 case_expr from expr2 to expr so that we can handle computed
6031 GOTOs as normal SELECTs from here on. */
6032 code->expr1 = code->expr2;
6037 case_expr = code->expr1;
6039 type = case_expr->ts.type;
6040 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6042 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6043 &case_expr->where, gfc_typename (&case_expr->ts));
6045 /* Punt. Going on here just produce more garbage error messages. */
6049 if (case_expr->rank != 0)
6051 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6052 "expression", &case_expr->where);
6058 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6059 of the SELECT CASE expression and its CASE values. Walk the lists
6060 of case values, and if we find a mismatch, promote case_expr to
6061 the appropriate kind. */
6063 if (type == BT_LOGICAL || type == BT_INTEGER)
6065 for (body = code->block; body; body = body->block)
6067 /* Walk the case label list. */
6068 for (cp = body->ext.case_list; cp; cp = cp->next)
6070 /* Intercept the DEFAULT case. It does not have a kind. */
6071 if (cp->low == NULL && cp->high == NULL)
6074 /* Unreachable case ranges are discarded, so ignore. */
6075 if (cp->low != NULL && cp->high != NULL
6076 && cp->low != cp->high
6077 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6080 /* FIXME: Should a warning be issued? */
6082 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6083 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6085 if (cp->high != NULL
6086 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6087 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6092 /* Assume there is no DEFAULT case. */
6093 default_case = NULL;
6098 for (body = code->block; body; body = body->block)
6100 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6102 seen_unreachable = 0;
6104 /* Walk the case label list, making sure that all case labels
6106 for (cp = body->ext.case_list; cp; cp = cp->next)
6108 /* Count the number of cases in the whole construct. */
6111 /* Intercept the DEFAULT case. */
6112 if (cp->low == NULL && cp->high == NULL)
6114 if (default_case != NULL)
6116 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6117 "by a second DEFAULT CASE at %L",
6118 &default_case->where, &cp->where);
6129 /* Deal with single value cases and case ranges. Errors are
6130 issued from the validation function. */
6131 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6132 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6138 if (type == BT_LOGICAL
6139 && ((cp->low == NULL || cp->high == NULL)
6140 || cp->low != cp->high))
6142 gfc_error ("Logical range in CASE statement at %L is not "
6143 "allowed", &cp->low->where);
6148 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6151 value = cp->low->value.logical == 0 ? 2 : 1;
6152 if (value & seen_logical)
6154 gfc_error ("constant logical value in CASE statement "
6155 "is repeated at %L",
6160 seen_logical |= value;
6163 if (cp->low != NULL && cp->high != NULL
6164 && cp->low != cp->high
6165 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6167 if (gfc_option.warn_surprising)
6168 gfc_warning ("Range specification at %L can never "
6169 "be matched", &cp->where);
6171 cp->unreachable = 1;
6172 seen_unreachable = 1;
6176 /* If the case range can be matched, it can also overlap with
6177 other cases. To make sure it does not, we put it in a
6178 double linked list here. We sort that with a merge sort
6179 later on to detect any overlapping cases. */
6183 head->right = head->left = NULL;
6188 tail->right->left = tail;
6195 /* It there was a failure in the previous case label, give up
6196 for this case label list. Continue with the next block. */
6200 /* See if any case labels that are unreachable have been seen.
6201 If so, we eliminate them. This is a bit of a kludge because
6202 the case lists for a single case statement (label) is a
6203 single forward linked lists. */
6204 if (seen_unreachable)
6206 /* Advance until the first case in the list is reachable. */
6207 while (body->ext.case_list != NULL
6208 && body->ext.case_list->unreachable)
6210 gfc_case *n = body->ext.case_list;
6211 body->ext.case_list = body->ext.case_list->next;
6213 gfc_free_case_list (n);
6216 /* Strip all other unreachable cases. */
6217 if (body->ext.case_list)
6219 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6221 if (cp->next->unreachable)
6223 gfc_case *n = cp->next;
6224 cp->next = cp->next->next;
6226 gfc_free_case_list (n);
6233 /* See if there were overlapping cases. If the check returns NULL,
6234 there was overlap. In that case we don't do anything. If head
6235 is non-NULL, we prepend the DEFAULT case. The sorted list can
6236 then used during code generation for SELECT CASE constructs with
6237 a case expression of a CHARACTER type. */
6240 head = check_case_overlap (head);
6242 /* Prepend the default_case if it is there. */
6243 if (head != NULL && default_case)
6245 default_case->left = NULL;
6246 default_case->right = head;
6247 head->left = default_case;
6251 /* Eliminate dead blocks that may be the result if we've seen
6252 unreachable case labels for a block. */
6253 for (body = code; body && body->block; body = body->block)
6255 if (body->block->ext.case_list == NULL)
6257 /* Cut the unreachable block from the code chain. */
6258 gfc_code *c = body->block;
6259 body->block = c->block;
6261 /* Kill the dead block, but not the blocks below it. */
6263 gfc_free_statements (c);
6267 /* More than two cases is legal but insane for logical selects.
6268 Issue a warning for it. */
6269 if (gfc_option.warn_surprising && type == BT_LOGICAL
6271 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6276 /* Resolve a transfer statement. This is making sure that:
6277 -- a derived type being transferred has only non-pointer components
6278 -- a derived type being transferred doesn't have private components, unless
6279 it's being transferred from the module where the type was defined
6280 -- we're not trying to transfer a whole assumed size array. */
6283 resolve_transfer (gfc_code *code)
6292 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
6295 sym = exp->symtree->n.sym;
6298 /* Go to actual component transferred. */
6299 for (ref = code->expr1->ref; ref; ref = ref->next)
6300 if (ref->type == REF_COMPONENT)
6301 ts = &ref->u.c.component->ts;
6303 if (ts->type == BT_DERIVED)
6305 /* Check that transferred derived type doesn't contain POINTER
6307 if (ts->derived->attr.pointer_comp)
6309 gfc_error ("Data transfer element at %L cannot have "
6310 "POINTER components", &code->loc);
6314 if (ts->derived->attr.alloc_comp)
6316 gfc_error ("Data transfer element at %L cannot have "
6317 "ALLOCATABLE components", &code->loc);
6321 if (derived_inaccessible (ts->derived))
6323 gfc_error ("Data transfer element at %L cannot have "
6324 "PRIVATE components",&code->loc);
6329 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
6330 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
6332 gfc_error ("Data transfer element at %L cannot be a full reference to "
6333 "an assumed-size array", &code->loc);
6339 /*********** Toplevel code resolution subroutines ***********/
6341 /* Find the set of labels that are reachable from this block. We also
6342 record the last statement in each block. */
6345 find_reachable_labels (gfc_code *block)
6352 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
6354 /* Collect labels in this block. We don't keep those corresponding
6355 to END {IF|SELECT}, these are checked in resolve_branch by going
6356 up through the code_stack. */
6357 for (c = block; c; c = c->next)
6359 if (c->here && c->op != EXEC_END_BLOCK)
6360 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
6363 /* Merge with labels from parent block. */
6366 gcc_assert (cs_base->prev->reachable_labels);
6367 bitmap_ior_into (cs_base->reachable_labels,
6368 cs_base->prev->reachable_labels);
6372 /* Given a branch to a label, see if the branch is conforming.
6373 The code node describes where the branch is located. */
6376 resolve_branch (gfc_st_label *label, gfc_code *code)
6383 /* Step one: is this a valid branching target? */
6385 if (label->defined == ST_LABEL_UNKNOWN)
6387 gfc_error ("Label %d referenced at %L is never defined", label->value,
6392 if (label->defined != ST_LABEL_TARGET)
6394 gfc_error ("Statement at %L is not a valid branch target statement "
6395 "for the branch statement at %L", &label->where, &code->loc);
6399 /* Step two: make sure this branch is not a branch to itself ;-) */
6401 if (code->here == label)
6403 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
6407 /* Step three: See if the label is in the same block as the
6408 branching statement. The hard work has been done by setting up
6409 the bitmap reachable_labels. */
6411 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
6414 /* Step four: If we haven't found the label in the bitmap, it may
6415 still be the label of the END of the enclosing block, in which
6416 case we find it by going up the code_stack. */
6418 for (stack = cs_base; stack; stack = stack->prev)
6419 if (stack->current->next && stack->current->next->here == label)
6424 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
6428 /* The label is not in an enclosing block, so illegal. This was
6429 allowed in Fortran 66, so we allow it as extension. No
6430 further checks are necessary in this case. */
6431 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
6432 "as the GOTO statement at %L", &label->where,
6438 /* Check whether EXPR1 has the same shape as EXPR2. */
6441 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
6443 mpz_t shape[GFC_MAX_DIMENSIONS];
6444 mpz_t shape2[GFC_MAX_DIMENSIONS];
6445 gfc_try result = FAILURE;
6448 /* Compare the rank. */
6449 if (expr1->rank != expr2->rank)
6452 /* Compare the size of each dimension. */
6453 for (i=0; i<expr1->rank; i++)
6455 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
6458 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
6461 if (mpz_cmp (shape[i], shape2[i]))
6465 /* When either of the two expression is an assumed size array, we
6466 ignore the comparison of dimension sizes. */
6471 for (i--; i >= 0; i--)
6473 mpz_clear (shape[i]);
6474 mpz_clear (shape2[i]);
6480 /* Check whether a WHERE assignment target or a WHERE mask expression
6481 has the same shape as the outmost WHERE mask expression. */
6484 resolve_where (gfc_code *code, gfc_expr *mask)
6490 cblock = code->block;
6492 /* Store the first WHERE mask-expr of the WHERE statement or construct.
6493 In case of nested WHERE, only the outmost one is stored. */
6494 if (mask == NULL) /* outmost WHERE */
6496 else /* inner WHERE */
6503 /* Check if the mask-expr has a consistent shape with the
6504 outmost WHERE mask-expr. */
6505 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
6506 gfc_error ("WHERE mask at %L has inconsistent shape",
6507 &cblock->expr1->where);
6510 /* the assignment statement of a WHERE statement, or the first
6511 statement in where-body-construct of a WHERE construct */
6512 cnext = cblock->next;
6517 /* WHERE assignment statement */
6520 /* Check shape consistent for WHERE assignment target. */
6521 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
6522 gfc_error ("WHERE assignment target at %L has "
6523 "inconsistent shape", &cnext->expr1->where);
6527 case EXEC_ASSIGN_CALL:
6528 resolve_call (cnext);
6529 if (!cnext->resolved_sym->attr.elemental)
6530 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6531 &cnext->ext.actual->expr->where);
6534 /* WHERE or WHERE construct is part of a where-body-construct */
6536 resolve_where (cnext, e);
6540 gfc_error ("Unsupported statement inside WHERE at %L",
6543 /* the next statement within the same where-body-construct */
6544 cnext = cnext->next;
6546 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6547 cblock = cblock->block;
6552 /* Resolve assignment in FORALL construct.
6553 NVAR is the number of FORALL index variables, and VAR_EXPR records the
6554 FORALL index variables. */
6557 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
6561 for (n = 0; n < nvar; n++)
6563 gfc_symbol *forall_index;
6565 forall_index = var_expr[n]->symtree->n.sym;
6567 /* Check whether the assignment target is one of the FORALL index
6569 if ((code->expr1->expr_type == EXPR_VARIABLE)
6570 && (code->expr1->symtree->n.sym == forall_index))
6571 gfc_error ("Assignment to a FORALL index variable at %L",
6572 &code->expr1->where);
6575 /* If one of the FORALL index variables doesn't appear in the
6576 assignment variable, then there could be a many-to-one
6577 assignment. Emit a warning rather than an error because the
6578 mask could be resolving this problem. */
6579 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
6580 gfc_warning ("The FORALL with index '%s' is not used on the "
6581 "left side of the assignment at %L and so might "
6582 "cause multiple assignment to this object",
6583 var_expr[n]->symtree->name, &code->expr1->where);
6589 /* Resolve WHERE statement in FORALL construct. */
6592 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
6593 gfc_expr **var_expr)
6598 cblock = code->block;
6601 /* the assignment statement of a WHERE statement, or the first
6602 statement in where-body-construct of a WHERE construct */
6603 cnext = cblock->next;
6608 /* WHERE assignment statement */
6610 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
6613 /* WHERE operator assignment statement */
6614 case EXEC_ASSIGN_CALL:
6615 resolve_call (cnext);
6616 if (!cnext->resolved_sym->attr.elemental)
6617 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
6618 &cnext->ext.actual->expr->where);
6621 /* WHERE or WHERE construct is part of a where-body-construct */
6623 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
6627 gfc_error ("Unsupported statement inside WHERE at %L",
6630 /* the next statement within the same where-body-construct */
6631 cnext = cnext->next;
6633 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
6634 cblock = cblock->block;
6639 /* Traverse the FORALL body to check whether the following errors exist:
6640 1. For assignment, check if a many-to-one assignment happens.
6641 2. For WHERE statement, check the WHERE body to see if there is any
6642 many-to-one assignment. */
6645 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
6649 c = code->block->next;
6655 case EXEC_POINTER_ASSIGN:
6656 gfc_resolve_assign_in_forall (c, nvar, var_expr);
6659 case EXEC_ASSIGN_CALL:
6663 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
6664 there is no need to handle it here. */
6668 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
6673 /* The next statement in the FORALL body. */
6679 /* Counts the number of iterators needed inside a forall construct, including
6680 nested forall constructs. This is used to allocate the needed memory
6681 in gfc_resolve_forall. */
6684 gfc_count_forall_iterators (gfc_code *code)
6686 int max_iters, sub_iters, current_iters;
6687 gfc_forall_iterator *fa;
6689 gcc_assert(code->op == EXEC_FORALL);
6693 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6696 code = code->block->next;
6700 if (code->op == EXEC_FORALL)
6702 sub_iters = gfc_count_forall_iterators (code);
6703 if (sub_iters > max_iters)
6704 max_iters = sub_iters;
6709 return current_iters + max_iters;
6713 /* Given a FORALL construct, first resolve the FORALL iterator, then call
6714 gfc_resolve_forall_body to resolve the FORALL body. */
6717 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
6719 static gfc_expr **var_expr;
6720 static int total_var = 0;
6721 static int nvar = 0;
6723 gfc_forall_iterator *fa;
6728 /* Start to resolve a FORALL construct */
6729 if (forall_save == 0)
6731 /* Count the total number of FORALL index in the nested FORALL
6732 construct in order to allocate the VAR_EXPR with proper size. */
6733 total_var = gfc_count_forall_iterators (code);
6735 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
6736 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
6739 /* The information about FORALL iterator, including FORALL index start, end
6740 and stride. The FORALL index can not appear in start, end or stride. */
6741 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
6743 /* Check if any outer FORALL index name is the same as the current
6745 for (i = 0; i < nvar; i++)
6747 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
6749 gfc_error ("An outer FORALL construct already has an index "
6750 "with this name %L", &fa->var->where);
6754 /* Record the current FORALL index. */
6755 var_expr[nvar] = gfc_copy_expr (fa->var);
6759 /* No memory leak. */
6760 gcc_assert (nvar <= total_var);
6763 /* Resolve the FORALL body. */
6764 gfc_resolve_forall_body (code, nvar, var_expr);
6766 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
6767 gfc_resolve_blocks (code->block, ns);
6771 /* Free only the VAR_EXPRs allocated in this frame. */
6772 for (i = nvar; i < tmp; i++)
6773 gfc_free_expr (var_expr[i]);
6777 /* We are in the outermost FORALL construct. */
6778 gcc_assert (forall_save == 0);
6780 /* VAR_EXPR is not needed any more. */
6781 gfc_free (var_expr);
6787 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
6790 static void resolve_code (gfc_code *, gfc_namespace *);
6793 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
6797 for (; b; b = b->block)
6799 t = gfc_resolve_expr (b->expr1);
6800 if (gfc_resolve_expr (b->expr2) == FAILURE)
6806 if (t == SUCCESS && b->expr1 != NULL
6807 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
6808 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6815 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
6816 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
6821 resolve_branch (b->label1, b);
6834 case EXEC_OMP_ATOMIC:
6835 case EXEC_OMP_CRITICAL:
6837 case EXEC_OMP_MASTER:
6838 case EXEC_OMP_ORDERED:
6839 case EXEC_OMP_PARALLEL:
6840 case EXEC_OMP_PARALLEL_DO:
6841 case EXEC_OMP_PARALLEL_SECTIONS:
6842 case EXEC_OMP_PARALLEL_WORKSHARE:
6843 case EXEC_OMP_SECTIONS:
6844 case EXEC_OMP_SINGLE:
6846 case EXEC_OMP_TASKWAIT:
6847 case EXEC_OMP_WORKSHARE:
6851 gfc_internal_error ("resolve_block(): Bad block type");
6854 resolve_code (b->next, ns);
6859 /* Does everything to resolve an ordinary assignment. Returns true
6860 if this is an interface assignment. */
6862 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
6872 if (gfc_extend_assign (code, ns) == SUCCESS)
6874 lhs = code->ext.actual->expr;
6875 rhs = code->ext.actual->next->expr;
6876 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6878 gfc_error ("Subroutine '%s' called instead of assignment at "
6879 "%L must be PURE", code->symtree->n.sym->name,
6884 /* Make a temporary rhs when there is a default initializer
6885 and rhs is the same symbol as the lhs. */
6886 if (rhs->expr_type == EXPR_VARIABLE
6887 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6888 && has_default_initializer (rhs->symtree->n.sym->ts.derived)
6889 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6890 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6899 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
6900 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
6901 &code->loc) == FAILURE)
6904 /* Handle the case of a BOZ literal on the RHS. */
6905 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
6908 if (gfc_option.warn_surprising)
6909 gfc_warning ("BOZ literal at %L is bitwise transferred "
6910 "non-integer symbol '%s'", &code->loc,
6911 lhs->symtree->n.sym->name);
6913 if (!gfc_convert_boz (rhs, &lhs->ts))
6915 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
6917 if (rc == ARITH_UNDERFLOW)
6918 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
6919 ". This check can be disabled with the option "
6920 "-fno-range-check", &rhs->where);
6921 else if (rc == ARITH_OVERFLOW)
6922 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
6923 ". This check can be disabled with the option "
6924 "-fno-range-check", &rhs->where);
6925 else if (rc == ARITH_NAN)
6926 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
6927 ". This check can be disabled with the option "
6928 "-fno-range-check", &rhs->where);
6934 if (lhs->ts.type == BT_CHARACTER
6935 && gfc_option.warn_character_truncation)
6937 if (lhs->ts.cl != NULL
6938 && lhs->ts.cl->length != NULL
6939 && lhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6940 llen = mpz_get_si (lhs->ts.cl->length->value.integer);
6942 if (rhs->expr_type == EXPR_CONSTANT)
6943 rlen = rhs->value.character.length;
6945 else if (rhs->ts.cl != NULL
6946 && rhs->ts.cl->length != NULL
6947 && rhs->ts.cl->length->expr_type == EXPR_CONSTANT)
6948 rlen = mpz_get_si (rhs->ts.cl->length->value.integer);
6950 if (rlen && llen && rlen > llen)
6951 gfc_warning_now ("CHARACTER expression will be truncated "
6952 "in assignment (%d/%d) at %L",
6953 llen, rlen, &code->loc);
6956 /* Ensure that a vector index expression for the lvalue is evaluated
6957 to a temporary if the lvalue symbol is referenced in it. */
6960 for (ref = lhs->ref; ref; ref= ref->next)
6961 if (ref->type == REF_ARRAY)
6963 for (n = 0; n < ref->u.ar.dimen; n++)
6964 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
6965 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
6966 ref->u.ar.start[n]))
6968 = gfc_get_parentheses (ref->u.ar.start[n]);
6972 if (gfc_pure (NULL))
6974 if (gfc_impure_variable (lhs->symtree->n.sym))
6976 gfc_error ("Cannot assign to variable '%s' in PURE "
6978 lhs->symtree->n.sym->name,
6983 if (lhs->ts.type == BT_DERIVED
6984 && lhs->expr_type == EXPR_VARIABLE
6985 && lhs->ts.derived->attr.pointer_comp
6986 && gfc_impure_variable (rhs->symtree->n.sym))
6988 gfc_error ("The impure variable at %L is assigned to "
6989 "a derived type variable with a POINTER "
6990 "component in a PURE procedure (12.6)",
6996 gfc_check_assign (lhs, rhs, 1);
7000 /* Given a block of code, recursively resolve everything pointed to by this
7004 resolve_code (gfc_code *code, gfc_namespace *ns)
7006 int omp_workshare_save;
7011 frame.prev = cs_base;
7015 find_reachable_labels (code);
7017 for (; code; code = code->next)
7019 frame.current = code;
7020 forall_save = forall_flag;
7022 if (code->op == EXEC_FORALL)
7025 gfc_resolve_forall (code, ns, forall_save);
7028 else if (code->block)
7030 omp_workshare_save = -1;
7033 case EXEC_OMP_PARALLEL_WORKSHARE:
7034 omp_workshare_save = omp_workshare_flag;
7035 omp_workshare_flag = 1;
7036 gfc_resolve_omp_parallel_blocks (code, ns);
7038 case EXEC_OMP_PARALLEL:
7039 case EXEC_OMP_PARALLEL_DO:
7040 case EXEC_OMP_PARALLEL_SECTIONS:
7042 omp_workshare_save = omp_workshare_flag;
7043 omp_workshare_flag = 0;
7044 gfc_resolve_omp_parallel_blocks (code, ns);
7047 gfc_resolve_omp_do_blocks (code, ns);
7049 case EXEC_OMP_WORKSHARE:
7050 omp_workshare_save = omp_workshare_flag;
7051 omp_workshare_flag = 1;
7054 gfc_resolve_blocks (code->block, ns);
7058 if (omp_workshare_save != -1)
7059 omp_workshare_flag = omp_workshare_save;
7063 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
7064 t = gfc_resolve_expr (code->expr1);
7065 forall_flag = forall_save;
7067 if (gfc_resolve_expr (code->expr2) == FAILURE)
7073 case EXEC_END_BLOCK:
7083 /* Keep track of which entry we are up to. */
7084 current_entry_id = code->ext.entry->id;
7088 resolve_where (code, NULL);
7092 if (code->expr1 != NULL)
7094 if (code->expr1->ts.type != BT_INTEGER)
7095 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7096 "INTEGER variable", &code->expr1->where);
7097 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7098 gfc_error ("Variable '%s' has not been assigned a target "
7099 "label at %L", code->expr1->symtree->n.sym->name,
7100 &code->expr1->where);
7103 resolve_branch (code->label1, code);
7107 if (code->expr1 != NULL
7108 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
7109 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
7110 "INTEGER return specifier", &code->expr1->where);
7113 case EXEC_INIT_ASSIGN:
7114 case EXEC_END_PROCEDURE:
7121 if (resolve_ordinary_assign (code, ns))
7126 case EXEC_LABEL_ASSIGN:
7127 if (code->label1->defined == ST_LABEL_UNKNOWN)
7128 gfc_error ("Label %d referenced at %L is never defined",
7129 code->label1->value, &code->label1->where);
7131 && (code->expr1->expr_type != EXPR_VARIABLE
7132 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
7133 || code->expr1->symtree->n.sym->ts.kind
7134 != gfc_default_integer_kind
7135 || code->expr1->symtree->n.sym->as != NULL))
7136 gfc_error ("ASSIGN statement at %L requires a scalar "
7137 "default INTEGER variable", &code->expr1->where);
7140 case EXEC_POINTER_ASSIGN:
7144 gfc_check_pointer_assign (code->expr1, code->expr2);
7147 case EXEC_ARITHMETIC_IF:
7149 && code->expr1->ts.type != BT_INTEGER
7150 && code->expr1->ts.type != BT_REAL)
7151 gfc_error ("Arithmetic IF statement at %L requires a numeric "
7152 "expression", &code->expr1->where);
7154 resolve_branch (code->label1, code);
7155 resolve_branch (code->label2, code);
7156 resolve_branch (code->label3, code);
7160 if (t == SUCCESS && code->expr1 != NULL
7161 && (code->expr1->ts.type != BT_LOGICAL
7162 || code->expr1->rank != 0))
7163 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7164 &code->expr1->where);
7169 resolve_call (code);
7173 resolve_typebound_call (code);
7177 resolve_ppc_call (code);
7181 /* Select is complicated. Also, a SELECT construct could be
7182 a transformed computed GOTO. */
7183 resolve_select (code);
7187 if (code->ext.iterator != NULL)
7189 gfc_iterator *iter = code->ext.iterator;
7190 if (gfc_resolve_iterator (iter, true) != FAILURE)
7191 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
7196 if (code->expr1 == NULL)
7197 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
7199 && (code->expr1->rank != 0
7200 || code->expr1->ts.type != BT_LOGICAL))
7201 gfc_error ("Exit condition of DO WHILE loop at %L must be "
7202 "a scalar LOGICAL expression", &code->expr1->where);
7207 resolve_allocate_deallocate (code, "ALLOCATE");
7211 case EXEC_DEALLOCATE:
7213 resolve_allocate_deallocate (code, "DEALLOCATE");
7218 if (gfc_resolve_open (code->ext.open) == FAILURE)
7221 resolve_branch (code->ext.open->err, code);
7225 if (gfc_resolve_close (code->ext.close) == FAILURE)
7228 resolve_branch (code->ext.close->err, code);
7231 case EXEC_BACKSPACE:
7235 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
7238 resolve_branch (code->ext.filepos->err, code);
7242 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7245 resolve_branch (code->ext.inquire->err, code);
7249 gcc_assert (code->ext.inquire != NULL);
7250 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
7253 resolve_branch (code->ext.inquire->err, code);
7257 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
7260 resolve_branch (code->ext.wait->err, code);
7261 resolve_branch (code->ext.wait->end, code);
7262 resolve_branch (code->ext.wait->eor, code);
7267 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
7270 resolve_branch (code->ext.dt->err, code);
7271 resolve_branch (code->ext.dt->end, code);
7272 resolve_branch (code->ext.dt->eor, code);
7276 resolve_transfer (code);
7280 resolve_forall_iterators (code->ext.forall_iterator);
7282 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
7283 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
7284 "expression", &code->expr1->where);
7287 case EXEC_OMP_ATOMIC:
7288 case EXEC_OMP_BARRIER:
7289 case EXEC_OMP_CRITICAL:
7290 case EXEC_OMP_FLUSH:
7292 case EXEC_OMP_MASTER:
7293 case EXEC_OMP_ORDERED:
7294 case EXEC_OMP_SECTIONS:
7295 case EXEC_OMP_SINGLE:
7296 case EXEC_OMP_TASKWAIT:
7297 case EXEC_OMP_WORKSHARE:
7298 gfc_resolve_omp_directive (code, ns);
7301 case EXEC_OMP_PARALLEL:
7302 case EXEC_OMP_PARALLEL_DO:
7303 case EXEC_OMP_PARALLEL_SECTIONS:
7304 case EXEC_OMP_PARALLEL_WORKSHARE:
7306 omp_workshare_save = omp_workshare_flag;
7307 omp_workshare_flag = 0;
7308 gfc_resolve_omp_directive (code, ns);
7309 omp_workshare_flag = omp_workshare_save;
7313 gfc_internal_error ("resolve_code(): Bad statement code");
7317 cs_base = frame.prev;
7321 /* Resolve initial values and make sure they are compatible with
7325 resolve_values (gfc_symbol *sym)
7327 if (sym->value == NULL)
7330 if (gfc_resolve_expr (sym->value) == FAILURE)
7333 gfc_check_assign_symbol (sym, sym->value);
7337 /* Verify the binding labels for common blocks that are BIND(C). The label
7338 for a BIND(C) common block must be identical in all scoping units in which
7339 the common block is declared. Further, the binding label can not collide
7340 with any other global entity in the program. */
7343 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
7345 if (comm_block_tree->n.common->is_bind_c == 1)
7347 gfc_gsymbol *binding_label_gsym;
7348 gfc_gsymbol *comm_name_gsym;
7350 /* See if a global symbol exists by the common block's name. It may
7351 be NULL if the common block is use-associated. */
7352 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
7353 comm_block_tree->n.common->name);
7354 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
7355 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
7356 "with the global entity '%s' at %L",
7357 comm_block_tree->n.common->binding_label,
7358 comm_block_tree->n.common->name,
7359 &(comm_block_tree->n.common->where),
7360 comm_name_gsym->name, &(comm_name_gsym->where));
7361 else if (comm_name_gsym != NULL
7362 && strcmp (comm_name_gsym->name,
7363 comm_block_tree->n.common->name) == 0)
7365 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
7367 if (comm_name_gsym->binding_label == NULL)
7368 /* No binding label for common block stored yet; save this one. */
7369 comm_name_gsym->binding_label =
7370 comm_block_tree->n.common->binding_label;
7372 if (strcmp (comm_name_gsym->binding_label,
7373 comm_block_tree->n.common->binding_label) != 0)
7375 /* Common block names match but binding labels do not. */
7376 gfc_error ("Binding label '%s' for common block '%s' at %L "
7377 "does not match the binding label '%s' for common "
7379 comm_block_tree->n.common->binding_label,
7380 comm_block_tree->n.common->name,
7381 &(comm_block_tree->n.common->where),
7382 comm_name_gsym->binding_label,
7383 comm_name_gsym->name,
7384 &(comm_name_gsym->where));
7389 /* There is no binding label (NAME="") so we have nothing further to
7390 check and nothing to add as a global symbol for the label. */
7391 if (comm_block_tree->n.common->binding_label[0] == '\0' )
7394 binding_label_gsym =
7395 gfc_find_gsymbol (gfc_gsym_root,
7396 comm_block_tree->n.common->binding_label);
7397 if (binding_label_gsym == NULL)
7399 /* Need to make a global symbol for the binding label to prevent
7400 it from colliding with another. */
7401 binding_label_gsym =
7402 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
7403 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
7404 binding_label_gsym->type = GSYM_COMMON;
7408 /* If comm_name_gsym is NULL, the name common block is use
7409 associated and the name could be colliding. */
7410 if (binding_label_gsym->type != GSYM_COMMON)
7411 gfc_error ("Binding label '%s' for common block '%s' at %L "
7412 "collides with the global entity '%s' at %L",
7413 comm_block_tree->n.common->binding_label,
7414 comm_block_tree->n.common->name,
7415 &(comm_block_tree->n.common->where),
7416 binding_label_gsym->name,
7417 &(binding_label_gsym->where));
7418 else if (comm_name_gsym != NULL
7419 && (strcmp (binding_label_gsym->name,
7420 comm_name_gsym->binding_label) != 0)
7421 && (strcmp (binding_label_gsym->sym_name,
7422 comm_name_gsym->name) != 0))
7423 gfc_error ("Binding label '%s' for common block '%s' at %L "
7424 "collides with global entity '%s' at %L",
7425 binding_label_gsym->name, binding_label_gsym->sym_name,
7426 &(comm_block_tree->n.common->where),
7427 comm_name_gsym->name, &(comm_name_gsym->where));
7435 /* Verify any BIND(C) derived types in the namespace so we can report errors
7436 for them once, rather than for each variable declared of that type. */
7439 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
7441 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
7442 && derived_sym->attr.is_bind_c == 1)
7443 verify_bind_c_derived_type (derived_sym);
7449 /* Verify that any binding labels used in a given namespace do not collide
7450 with the names or binding labels of any global symbols. */
7453 gfc_verify_binding_labels (gfc_symbol *sym)
7457 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
7458 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
7460 gfc_gsymbol *bind_c_sym;
7462 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
7463 if (bind_c_sym != NULL
7464 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
7466 if (sym->attr.if_source == IFSRC_DECL
7467 && (bind_c_sym->type != GSYM_SUBROUTINE
7468 && bind_c_sym->type != GSYM_FUNCTION)
7469 && ((sym->attr.contained == 1
7470 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
7471 || (sym->attr.use_assoc == 1
7472 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
7474 /* Make sure global procedures don't collide with anything. */
7475 gfc_error ("Binding label '%s' at %L collides with the global "
7476 "entity '%s' at %L", sym->binding_label,
7477 &(sym->declared_at), bind_c_sym->name,
7478 &(bind_c_sym->where));
7481 else if (sym->attr.contained == 0
7482 && (sym->attr.if_source == IFSRC_IFBODY
7483 && sym->attr.flavor == FL_PROCEDURE)
7484 && (bind_c_sym->sym_name != NULL
7485 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
7487 /* Make sure procedures in interface bodies don't collide. */
7488 gfc_error ("Binding label '%s' in interface body at %L collides "
7489 "with the global entity '%s' at %L",
7491 &(sym->declared_at), bind_c_sym->name,
7492 &(bind_c_sym->where));
7495 else if (sym->attr.contained == 0
7496 && sym->attr.if_source == IFSRC_UNKNOWN)
7497 if ((sym->attr.use_assoc && bind_c_sym->mod_name
7498 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
7499 || sym->attr.use_assoc == 0)
7501 gfc_error ("Binding label '%s' at %L collides with global "
7502 "entity '%s' at %L", sym->binding_label,
7503 &(sym->declared_at), bind_c_sym->name,
7504 &(bind_c_sym->where));
7509 /* Clear the binding label to prevent checking multiple times. */
7510 sym->binding_label[0] = '\0';
7512 else if (bind_c_sym == NULL)
7514 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
7515 bind_c_sym->where = sym->declared_at;
7516 bind_c_sym->sym_name = sym->name;
7518 if (sym->attr.use_assoc == 1)
7519 bind_c_sym->mod_name = sym->module;
7521 if (sym->ns->proc_name != NULL)
7522 bind_c_sym->mod_name = sym->ns->proc_name->name;
7524 if (sym->attr.contained == 0)
7526 if (sym->attr.subroutine)
7527 bind_c_sym->type = GSYM_SUBROUTINE;
7528 else if (sym->attr.function)
7529 bind_c_sym->type = GSYM_FUNCTION;
7537 /* Resolve an index expression. */
7540 resolve_index_expr (gfc_expr *e)
7542 if (gfc_resolve_expr (e) == FAILURE)
7545 if (gfc_simplify_expr (e, 0) == FAILURE)
7548 if (gfc_specification_expr (e) == FAILURE)
7554 /* Resolve a charlen structure. */
7557 resolve_charlen (gfc_charlen *cl)
7566 specification_expr = 1;
7568 if (resolve_index_expr (cl->length) == FAILURE)
7570 specification_expr = 0;
7574 /* "If the character length parameter value evaluates to a negative
7575 value, the length of character entities declared is zero." */
7576 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
7578 gfc_warning_now ("CHARACTER variable has zero length at %L",
7579 &cl->length->where);
7580 gfc_replace_expr (cl->length, gfc_int_expr (0));
7583 /* Check that the character length is not too large. */
7584 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
7585 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
7586 && cl->length->ts.type == BT_INTEGER
7587 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
7589 gfc_error ("String length at %L is too large", &cl->length->where);
7597 /* Test for non-constant shape arrays. */
7600 is_non_constant_shape_array (gfc_symbol *sym)
7606 not_constant = false;
7607 if (sym->as != NULL)
7609 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
7610 has not been simplified; parameter array references. Do the
7611 simplification now. */
7612 for (i = 0; i < sym->as->rank; i++)
7614 e = sym->as->lower[i];
7615 if (e && (resolve_index_expr (e) == FAILURE
7616 || !gfc_is_constant_expr (e)))
7617 not_constant = true;
7619 e = sym->as->upper[i];
7620 if (e && (resolve_index_expr (e) == FAILURE
7621 || !gfc_is_constant_expr (e)))
7622 not_constant = true;
7625 return not_constant;
7628 /* Given a symbol and an initialization expression, add code to initialize
7629 the symbol to the function entry. */
7631 build_init_assign (gfc_symbol *sym, gfc_expr *init)
7635 gfc_namespace *ns = sym->ns;
7637 /* Search for the function namespace if this is a contained
7638 function without an explicit result. */
7639 if (sym->attr.function && sym == sym->result
7640 && sym->name != sym->ns->proc_name->name)
7643 for (;ns; ns = ns->sibling)
7644 if (strcmp (ns->proc_name->name, sym->name) == 0)
7650 gfc_free_expr (init);
7654 /* Build an l-value expression for the result. */
7655 lval = gfc_lval_expr_from_sym (sym);
7657 /* Add the code at scope entry. */
7658 init_st = gfc_get_code ();
7659 init_st->next = ns->code;
7662 /* Assign the default initializer to the l-value. */
7663 init_st->loc = sym->declared_at;
7664 init_st->op = EXEC_INIT_ASSIGN;
7665 init_st->expr1 = lval;
7666 init_st->expr2 = init;
7669 /* Assign the default initializer to a derived type variable or result. */
7672 apply_default_init (gfc_symbol *sym)
7674 gfc_expr *init = NULL;
7676 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7679 if (sym->ts.type == BT_DERIVED && sym->ts.derived)
7680 init = gfc_default_initializer (&sym->ts);
7685 build_init_assign (sym, init);
7688 /* Build an initializer for a local integer, real, complex, logical, or
7689 character variable, based on the command line flags finit-local-zero,
7690 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
7691 null if the symbol should not have a default initialization. */
7693 build_default_init_expr (gfc_symbol *sym)
7696 gfc_expr *init_expr;
7699 /* These symbols should never have a default initialization. */
7700 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
7701 || sym->attr.external
7703 || sym->attr.pointer
7704 || sym->attr.in_equivalence
7705 || sym->attr.in_common
7708 || sym->attr.cray_pointee
7709 || sym->attr.cray_pointer)
7712 /* Now we'll try to build an initializer expression. */
7713 init_expr = gfc_get_expr ();
7714 init_expr->expr_type = EXPR_CONSTANT;
7715 init_expr->ts.type = sym->ts.type;
7716 init_expr->ts.kind = sym->ts.kind;
7717 init_expr->where = sym->declared_at;
7719 /* We will only initialize integers, reals, complex, logicals, and
7720 characters, and only if the corresponding command-line flags
7721 were set. Otherwise, we free init_expr and return null. */
7722 switch (sym->ts.type)
7725 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
7726 mpz_init_set_si (init_expr->value.integer,
7727 gfc_option.flag_init_integer_value);
7730 gfc_free_expr (init_expr);
7736 mpfr_init (init_expr->value.real);
7737 switch (gfc_option.flag_init_real)
7739 case GFC_INIT_REAL_SNAN:
7740 init_expr->is_snan = 1;
7742 case GFC_INIT_REAL_NAN:
7743 mpfr_set_nan (init_expr->value.real);
7746 case GFC_INIT_REAL_INF:
7747 mpfr_set_inf (init_expr->value.real, 1);
7750 case GFC_INIT_REAL_NEG_INF:
7751 mpfr_set_inf (init_expr->value.real, -1);
7754 case GFC_INIT_REAL_ZERO:
7755 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
7759 gfc_free_expr (init_expr);
7767 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
7769 mpfr_init (init_expr->value.complex.r);
7770 mpfr_init (init_expr->value.complex.i);
7772 switch (gfc_option.flag_init_real)
7774 case GFC_INIT_REAL_SNAN:
7775 init_expr->is_snan = 1;
7777 case GFC_INIT_REAL_NAN:
7778 mpfr_set_nan (mpc_realref (init_expr->value.complex));
7779 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
7782 case GFC_INIT_REAL_INF:
7783 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
7784 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
7787 case GFC_INIT_REAL_NEG_INF:
7788 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
7789 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
7792 case GFC_INIT_REAL_ZERO:
7794 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
7796 mpfr_set_ui (init_expr->value.complex.r, 0.0, GFC_RND_MODE);
7797 mpfr_set_ui (init_expr->value.complex.i, 0.0, GFC_RND_MODE);
7802 gfc_free_expr (init_expr);
7809 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
7810 init_expr->value.logical = 0;
7811 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
7812 init_expr->value.logical = 1;
7815 gfc_free_expr (init_expr);
7821 /* For characters, the length must be constant in order to
7822 create a default initializer. */
7823 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
7824 && sym->ts.cl->length
7825 && sym->ts.cl->length->expr_type == EXPR_CONSTANT)
7827 char_len = mpz_get_si (sym->ts.cl->length->value.integer);
7828 init_expr->value.character.length = char_len;
7829 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
7830 for (i = 0; i < char_len; i++)
7831 init_expr->value.character.string[i]
7832 = (unsigned char) gfc_option.flag_init_character_value;
7836 gfc_free_expr (init_expr);
7842 gfc_free_expr (init_expr);
7848 /* Add an initialization expression to a local variable. */
7850 apply_default_init_local (gfc_symbol *sym)
7852 gfc_expr *init = NULL;
7854 /* The symbol should be a variable or a function return value. */
7855 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
7856 || (sym->attr.function && sym->result != sym))
7859 /* Try to build the initializer expression. If we can't initialize
7860 this symbol, then init will be NULL. */
7861 init = build_default_init_expr (sym);
7865 /* For saved variables, we don't want to add an initializer at
7866 function entry, so we just add a static initializer. */
7867 if (sym->attr.save || sym->ns->save_all)
7869 /* Don't clobber an existing initializer! */
7870 gcc_assert (sym->value == NULL);
7875 build_init_assign (sym, init);
7878 /* Resolution of common features of flavors variable and procedure. */
7881 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
7883 /* Constraints on deferred shape variable. */
7884 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
7886 if (sym->attr.allocatable)
7888 if (sym->attr.dimension)
7889 gfc_error ("Allocatable array '%s' at %L must have "
7890 "a deferred shape", sym->name, &sym->declared_at);
7892 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
7893 sym->name, &sym->declared_at);
7897 if (sym->attr.pointer && sym->attr.dimension)
7899 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
7900 sym->name, &sym->declared_at);
7907 if (!mp_flag && !sym->attr.allocatable
7908 && !sym->attr.pointer && !sym->attr.dummy)
7910 gfc_error ("Array '%s' at %L cannot have a deferred shape",
7911 sym->name, &sym->declared_at);
7919 /* Check if a derived type is extensible. */
7922 type_is_extensible (gfc_symbol *sym)
7924 return !(sym->attr.is_bind_c || sym->attr.sequence);
7928 /* Additional checks for symbols with flavor variable and derived
7929 type. To be called from resolve_fl_variable. */
7932 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
7934 gcc_assert (sym->ts.type == BT_DERIVED);
7936 /* Check to see if a derived type is blocked from being host
7937 associated by the presence of another class I symbol in the same
7938 namespace. 14.6.1.3 of the standard and the discussion on
7939 comp.lang.fortran. */
7940 if (sym->ns != sym->ts.derived->ns
7941 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
7944 gfc_find_symbol (sym->ts.derived->name, sym->ns, 0, &s);
7945 if (s && s->attr.flavor != FL_DERIVED)
7947 gfc_error ("The type '%s' cannot be host associated at %L "
7948 "because it is blocked by an incompatible object "
7949 "of the same name declared at %L",
7950 sym->ts.derived->name, &sym->declared_at,
7956 /* 4th constraint in section 11.3: "If an object of a type for which
7957 component-initialization is specified (R429) appears in the
7958 specification-part of a module and does not have the ALLOCATABLE
7959 or POINTER attribute, the object shall have the SAVE attribute."
7961 The check for initializers is performed with
7962 has_default_initializer because gfc_default_initializer generates
7963 a hidden default for allocatable components. */
7964 if (!(sym->value || no_init_flag) && sym->ns->proc_name
7965 && sym->ns->proc_name->attr.flavor == FL_MODULE
7966 && !sym->ns->save_all && !sym->attr.save
7967 && !sym->attr.pointer && !sym->attr.allocatable
7968 && has_default_initializer (sym->ts.derived))
7970 gfc_error("Object '%s' at %L must have the SAVE attribute for "
7971 "default initialization of a component",
7972 sym->name, &sym->declared_at);
7976 if (sym->ts.is_class)
7979 if (!type_is_extensible (sym->ts.derived))
7981 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
7982 sym->ts.derived->name, sym->name, &sym->declared_at);
7987 if (!(sym->attr.dummy || sym->attr.allocatable || sym->attr.pointer))
7989 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
7990 "or pointer", sym->name, &sym->declared_at);
7995 /* Assign default initializer. */
7996 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
7997 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
7999 sym->value = gfc_default_initializer (&sym->ts);
8006 /* Resolve symbols with flavor variable. */
8009 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8011 int no_init_flag, automatic_flag;
8013 const char *auto_save_msg;
8015 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8018 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8021 /* Set this flag to check that variables are parameters of all entries.
8022 This check is effected by the call to gfc_resolve_expr through
8023 is_non_constant_shape_array. */
8024 specification_expr = 1;
8026 if (sym->ns->proc_name
8027 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8028 || sym->ns->proc_name->attr.is_main_program)
8029 && !sym->attr.use_assoc
8030 && !sym->attr.allocatable
8031 && !sym->attr.pointer
8032 && is_non_constant_shape_array (sym))
8034 /* The shape of a main program or module array needs to be
8036 gfc_error ("The module or main program array '%s' at %L must "
8037 "have constant shape", sym->name, &sym->declared_at);
8038 specification_expr = 0;
8042 if (sym->ts.type == BT_CHARACTER)
8044 /* Make sure that character string variables with assumed length are
8046 e = sym->ts.cl->length;
8047 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
8049 gfc_error ("Entity with assumed character length at %L must be a "
8050 "dummy argument or a PARAMETER", &sym->declared_at);
8054 if (e && sym->attr.save && !gfc_is_constant_expr (e))
8056 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8060 if (!gfc_is_constant_expr (e)
8061 && !(e->expr_type == EXPR_VARIABLE
8062 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
8063 && sym->ns->proc_name
8064 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8065 || sym->ns->proc_name->attr.is_main_program)
8066 && !sym->attr.use_assoc)
8068 gfc_error ("'%s' at %L must have constant character length "
8069 "in this context", sym->name, &sym->declared_at);
8074 if (sym->value == NULL && sym->attr.referenced)
8075 apply_default_init_local (sym); /* Try to apply a default initialization. */
8077 /* Determine if the symbol may not have an initializer. */
8078 no_init_flag = automatic_flag = 0;
8079 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
8080 || sym->attr.intrinsic || sym->attr.result)
8082 else if (sym->attr.dimension && !sym->attr.pointer
8083 && is_non_constant_shape_array (sym))
8085 no_init_flag = automatic_flag = 1;
8087 /* Also, they must not have the SAVE attribute.
8088 SAVE_IMPLICIT is checked below. */
8089 if (sym->attr.save == SAVE_EXPLICIT)
8091 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8096 /* Ensure that any initializer is simplified. */
8098 gfc_simplify_expr (sym->value, 1);
8100 /* Reject illegal initializers. */
8101 if (!sym->mark && sym->value)
8103 if (sym->attr.allocatable)
8104 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
8105 sym->name, &sym->declared_at);
8106 else if (sym->attr.external)
8107 gfc_error ("External '%s' at %L cannot have an initializer",
8108 sym->name, &sym->declared_at);
8109 else if (sym->attr.dummy
8110 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
8111 gfc_error ("Dummy '%s' at %L cannot have an initializer",
8112 sym->name, &sym->declared_at);
8113 else if (sym->attr.intrinsic)
8114 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
8115 sym->name, &sym->declared_at);
8116 else if (sym->attr.result)
8117 gfc_error ("Function result '%s' at %L cannot have an initializer",
8118 sym->name, &sym->declared_at);
8119 else if (automatic_flag)
8120 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
8121 sym->name, &sym->declared_at);
8128 if (sym->ts.type == BT_DERIVED)
8129 return resolve_fl_variable_derived (sym, no_init_flag);
8135 /* Resolve a procedure. */
8138 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
8140 gfc_formal_arglist *arg;
8142 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
8143 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
8144 "interfaces", sym->name, &sym->declared_at);
8146 if (sym->attr.function
8147 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8150 if (sym->ts.type == BT_CHARACTER)
8152 gfc_charlen *cl = sym->ts.cl;
8154 if (cl && cl->length && gfc_is_constant_expr (cl->length)
8155 && resolve_charlen (cl) == FAILURE)
8158 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
8160 if (sym->attr.proc == PROC_ST_FUNCTION)
8162 gfc_error ("Character-valued statement function '%s' at %L must "
8163 "have constant length", sym->name, &sym->declared_at);
8167 if (sym->attr.external && sym->formal == NULL
8168 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
8170 gfc_error ("Automatic character length function '%s' at %L must "
8171 "have an explicit interface", sym->name,
8178 /* Ensure that derived type for are not of a private type. Internal
8179 module procedures are excluded by 2.2.3.3 - i.e., they are not
8180 externally accessible and can access all the objects accessible in
8182 if (!(sym->ns->parent
8183 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
8184 && gfc_check_access(sym->attr.access, sym->ns->default_access))
8186 gfc_interface *iface;
8188 for (arg = sym->formal; arg; arg = arg->next)
8191 && arg->sym->ts.type == BT_DERIVED
8192 && !arg->sym->ts.derived->attr.use_assoc
8193 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8194 arg->sym->ts.derived->ns->default_access)
8195 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
8196 "PRIVATE type and cannot be a dummy argument"
8197 " of '%s', which is PUBLIC at %L",
8198 arg->sym->name, sym->name, &sym->declared_at)
8201 /* Stop this message from recurring. */
8202 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8207 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8208 PRIVATE to the containing module. */
8209 for (iface = sym->generic; iface; iface = iface->next)
8211 for (arg = iface->sym->formal; arg; arg = arg->next)
8214 && arg->sym->ts.type == BT_DERIVED
8215 && !arg->sym->ts.derived->attr.use_assoc
8216 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8217 arg->sym->ts.derived->ns->default_access)
8218 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8219 "'%s' in PUBLIC interface '%s' at %L "
8220 "takes dummy arguments of '%s' which is "
8221 "PRIVATE", iface->sym->name, sym->name,
8222 &iface->sym->declared_at,
8223 gfc_typename (&arg->sym->ts)) == FAILURE)
8225 /* Stop this message from recurring. */
8226 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8232 /* PUBLIC interfaces may expose PRIVATE procedures that take types
8233 PRIVATE to the containing module. */
8234 for (iface = sym->generic; iface; iface = iface->next)
8236 for (arg = iface->sym->formal; arg; arg = arg->next)
8239 && arg->sym->ts.type == BT_DERIVED
8240 && !arg->sym->ts.derived->attr.use_assoc
8241 && !gfc_check_access (arg->sym->ts.derived->attr.access,
8242 arg->sym->ts.derived->ns->default_access)
8243 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
8244 "'%s' in PUBLIC interface '%s' at %L "
8245 "takes dummy arguments of '%s' which is "
8246 "PRIVATE", iface->sym->name, sym->name,
8247 &iface->sym->declared_at,
8248 gfc_typename (&arg->sym->ts)) == FAILURE)
8250 /* Stop this message from recurring. */
8251 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
8258 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
8259 && !sym->attr.proc_pointer)
8261 gfc_error ("Function '%s' at %L cannot have an initializer",
8262 sym->name, &sym->declared_at);
8266 /* An external symbol may not have an initializer because it is taken to be
8267 a procedure. Exception: Procedure Pointers. */
8268 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
8270 gfc_error ("External object '%s' at %L may not have an initializer",
8271 sym->name, &sym->declared_at);
8275 /* An elemental function is required to return a scalar 12.7.1 */
8276 if (sym->attr.elemental && sym->attr.function && sym->as)
8278 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
8279 "result", sym->name, &sym->declared_at);
8280 /* Reset so that the error only occurs once. */
8281 sym->attr.elemental = 0;
8285 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
8286 char-len-param shall not be array-valued, pointer-valued, recursive
8287 or pure. ....snip... A character value of * may only be used in the
8288 following ways: (i) Dummy arg of procedure - dummy associates with
8289 actual length; (ii) To declare a named constant; or (iii) External
8290 function - but length must be declared in calling scoping unit. */
8291 if (sym->attr.function
8292 && sym->ts.type == BT_CHARACTER
8293 && sym->ts.cl && sym->ts.cl->length == NULL)
8295 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
8296 || (sym->attr.recursive) || (sym->attr.pure))
8298 if (sym->as && sym->as->rank)
8299 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8300 "array-valued", sym->name, &sym->declared_at);
8302 if (sym->attr.pointer)
8303 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8304 "pointer-valued", sym->name, &sym->declared_at);
8307 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8308 "pure", sym->name, &sym->declared_at);
8310 if (sym->attr.recursive)
8311 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
8312 "recursive", sym->name, &sym->declared_at);
8317 /* Appendix B.2 of the standard. Contained functions give an
8318 error anyway. Fixed-form is likely to be F77/legacy. */
8319 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
8320 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
8321 "CHARACTER(*) function '%s' at %L",
8322 sym->name, &sym->declared_at);
8325 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
8327 gfc_formal_arglist *curr_arg;
8328 int has_non_interop_arg = 0;
8330 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
8331 sym->common_block) == FAILURE)
8333 /* Clear these to prevent looking at them again if there was an
8335 sym->attr.is_bind_c = 0;
8336 sym->attr.is_c_interop = 0;
8337 sym->ts.is_c_interop = 0;
8341 /* So far, no errors have been found. */
8342 sym->attr.is_c_interop = 1;
8343 sym->ts.is_c_interop = 1;
8346 curr_arg = sym->formal;
8347 while (curr_arg != NULL)
8349 /* Skip implicitly typed dummy args here. */
8350 if (curr_arg->sym->attr.implicit_type == 0)
8351 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
8352 /* If something is found to fail, record the fact so we
8353 can mark the symbol for the procedure as not being
8354 BIND(C) to try and prevent multiple errors being
8356 has_non_interop_arg = 1;
8358 curr_arg = curr_arg->next;
8361 /* See if any of the arguments were not interoperable and if so, clear
8362 the procedure symbol to prevent duplicate error messages. */
8363 if (has_non_interop_arg != 0)
8365 sym->attr.is_c_interop = 0;
8366 sym->ts.is_c_interop = 0;
8367 sym->attr.is_bind_c = 0;
8371 if (!sym->attr.proc_pointer)
8373 if (sym->attr.save == SAVE_EXPLICIT)
8375 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
8376 "in '%s' at %L", sym->name, &sym->declared_at);
8379 if (sym->attr.intent)
8381 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
8382 "in '%s' at %L", sym->name, &sym->declared_at);
8385 if (sym->attr.subroutine && sym->attr.result)
8387 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
8388 "in '%s' at %L", sym->name, &sym->declared_at);
8391 if (sym->attr.external && sym->attr.function
8392 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
8393 || sym->attr.contained))
8395 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
8396 "in '%s' at %L", sym->name, &sym->declared_at);
8399 if (strcmp ("ppr@", sym->name) == 0)
8401 gfc_error ("Procedure pointer result '%s' at %L "
8402 "is missing the pointer attribute",
8403 sym->ns->proc_name->name, &sym->declared_at);
8412 /* Resolve a list of finalizer procedures. That is, after they have hopefully
8413 been defined and we now know their defined arguments, check that they fulfill
8414 the requirements of the standard for procedures used as finalizers. */
8417 gfc_resolve_finalizers (gfc_symbol* derived)
8419 gfc_finalizer* list;
8420 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
8421 gfc_try result = SUCCESS;
8422 bool seen_scalar = false;
8424 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
8427 /* Walk over the list of finalizer-procedures, check them, and if any one
8428 does not fit in with the standard's definition, print an error and remove
8429 it from the list. */
8430 prev_link = &derived->f2k_derived->finalizers;
8431 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
8437 /* Skip this finalizer if we already resolved it. */
8438 if (list->proc_tree)
8440 prev_link = &(list->next);
8444 /* Check this exists and is a SUBROUTINE. */
8445 if (!list->proc_sym->attr.subroutine)
8447 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
8448 list->proc_sym->name, &list->where);
8452 /* We should have exactly one argument. */
8453 if (!list->proc_sym->formal || list->proc_sym->formal->next)
8455 gfc_error ("FINAL procedure at %L must have exactly one argument",
8459 arg = list->proc_sym->formal->sym;
8461 /* This argument must be of our type. */
8462 if (arg->ts.type != BT_DERIVED || arg->ts.derived != derived)
8464 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
8465 &arg->declared_at, derived->name);
8469 /* It must neither be a pointer nor allocatable nor optional. */
8470 if (arg->attr.pointer)
8472 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
8476 if (arg->attr.allocatable)
8478 gfc_error ("Argument of FINAL procedure at %L must not be"
8479 " ALLOCATABLE", &arg->declared_at);
8482 if (arg->attr.optional)
8484 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
8489 /* It must not be INTENT(OUT). */
8490 if (arg->attr.intent == INTENT_OUT)
8492 gfc_error ("Argument of FINAL procedure at %L must not be"
8493 " INTENT(OUT)", &arg->declared_at);
8497 /* Warn if the procedure is non-scalar and not assumed shape. */
8498 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
8499 && arg->as->type != AS_ASSUMED_SHAPE)
8500 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
8501 " shape argument", &arg->declared_at);
8503 /* Check that it does not match in kind and rank with a FINAL procedure
8504 defined earlier. To really loop over the *earlier* declarations,
8505 we need to walk the tail of the list as new ones were pushed at the
8507 /* TODO: Handle kind parameters once they are implemented. */
8508 my_rank = (arg->as ? arg->as->rank : 0);
8509 for (i = list->next; i; i = i->next)
8511 /* Argument list might be empty; that is an error signalled earlier,
8512 but we nevertheless continued resolving. */
8513 if (i->proc_sym->formal)
8515 gfc_symbol* i_arg = i->proc_sym->formal->sym;
8516 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
8517 if (i_rank == my_rank)
8519 gfc_error ("FINAL procedure '%s' declared at %L has the same"
8520 " rank (%d) as '%s'",
8521 list->proc_sym->name, &list->where, my_rank,
8528 /* Is this the/a scalar finalizer procedure? */
8529 if (!arg->as || arg->as->rank == 0)
8532 /* Find the symtree for this procedure. */
8533 gcc_assert (!list->proc_tree);
8534 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
8536 prev_link = &list->next;
8539 /* Remove wrong nodes immediately from the list so we don't risk any
8540 troubles in the future when they might fail later expectations. */
8544 *prev_link = list->next;
8545 gfc_free_finalizer (i);
8548 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
8549 were nodes in the list, must have been for arrays. It is surely a good
8550 idea to have a scalar version there if there's something to finalize. */
8551 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
8552 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
8553 " defined at %L, suggest also scalar one",
8554 derived->name, &derived->declared_at);
8556 /* TODO: Remove this error when finalization is finished. */
8557 gfc_error ("Finalization at %L is not yet implemented",
8558 &derived->declared_at);
8564 /* Check that it is ok for the typebound procedure proc to override the
8568 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
8571 const gfc_symbol* proc_target;
8572 const gfc_symbol* old_target;
8573 unsigned proc_pass_arg, old_pass_arg, argpos;
8574 gfc_formal_arglist* proc_formal;
8575 gfc_formal_arglist* old_formal;
8577 /* This procedure should only be called for non-GENERIC proc. */
8578 gcc_assert (!proc->n.tb->is_generic);
8580 /* If the overwritten procedure is GENERIC, this is an error. */
8581 if (old->n.tb->is_generic)
8583 gfc_error ("Can't overwrite GENERIC '%s' at %L",
8584 old->name, &proc->n.tb->where);
8588 where = proc->n.tb->where;
8589 proc_target = proc->n.tb->u.specific->n.sym;
8590 old_target = old->n.tb->u.specific->n.sym;
8592 /* Check that overridden binding is not NON_OVERRIDABLE. */
8593 if (old->n.tb->non_overridable)
8595 gfc_error ("'%s' at %L overrides a procedure binding declared"
8596 " NON_OVERRIDABLE", proc->name, &where);
8600 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
8601 if (!old->n.tb->deferred && proc->n.tb->deferred)
8603 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
8604 " non-DEFERRED binding", proc->name, &where);
8608 /* If the overridden binding is PURE, the overriding must be, too. */
8609 if (old_target->attr.pure && !proc_target->attr.pure)
8611 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
8612 proc->name, &where);
8616 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
8617 is not, the overriding must not be either. */
8618 if (old_target->attr.elemental && !proc_target->attr.elemental)
8620 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
8621 " ELEMENTAL", proc->name, &where);
8624 if (!old_target->attr.elemental && proc_target->attr.elemental)
8626 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
8627 " be ELEMENTAL, either", proc->name, &where);
8631 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
8633 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
8635 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
8636 " SUBROUTINE", proc->name, &where);
8640 /* If the overridden binding is a FUNCTION, the overriding must also be a
8641 FUNCTION and have the same characteristics. */
8642 if (old_target->attr.function)
8644 if (!proc_target->attr.function)
8646 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
8647 " FUNCTION", proc->name, &where);
8651 /* FIXME: Do more comprehensive checking (including, for instance, the
8652 rank and array-shape). */
8653 gcc_assert (proc_target->result && old_target->result);
8654 if (!gfc_compare_types (&proc_target->result->ts,
8655 &old_target->result->ts))
8657 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
8658 " matching result types", proc->name, &where);
8663 /* If the overridden binding is PUBLIC, the overriding one must not be
8665 if (old->n.tb->access == ACCESS_PUBLIC
8666 && proc->n.tb->access == ACCESS_PRIVATE)
8668 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
8669 " PRIVATE", proc->name, &where);
8673 /* Compare the formal argument lists of both procedures. This is also abused
8674 to find the position of the passed-object dummy arguments of both
8675 bindings as at least the overridden one might not yet be resolved and we
8676 need those positions in the check below. */
8677 proc_pass_arg = old_pass_arg = 0;
8678 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
8680 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
8683 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
8684 proc_formal && old_formal;
8685 proc_formal = proc_formal->next, old_formal = old_formal->next)
8687 if (proc->n.tb->pass_arg
8688 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
8689 proc_pass_arg = argpos;
8690 if (old->n.tb->pass_arg
8691 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
8692 old_pass_arg = argpos;
8694 /* Check that the names correspond. */
8695 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
8697 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
8698 " to match the corresponding argument of the overridden"
8699 " procedure", proc_formal->sym->name, proc->name, &where,
8700 old_formal->sym->name);
8704 /* Check that the types correspond if neither is the passed-object
8706 /* FIXME: Do more comprehensive testing here. */
8707 if (proc_pass_arg != argpos && old_pass_arg != argpos
8708 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
8710 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L in"
8711 " in respect to the overridden procedure",
8712 proc_formal->sym->name, proc->name, &where);
8718 if (proc_formal || old_formal)
8720 gfc_error ("'%s' at %L must have the same number of formal arguments as"
8721 " the overridden procedure", proc->name, &where);
8725 /* If the overridden binding is NOPASS, the overriding one must also be
8727 if (old->n.tb->nopass && !proc->n.tb->nopass)
8729 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
8730 " NOPASS", proc->name, &where);
8734 /* If the overridden binding is PASS(x), the overriding one must also be
8735 PASS and the passed-object dummy arguments must correspond. */
8736 if (!old->n.tb->nopass)
8738 if (proc->n.tb->nopass)
8740 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
8741 " PASS", proc->name, &where);
8745 if (proc_pass_arg != old_pass_arg)
8747 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
8748 " the same position as the passed-object dummy argument of"
8749 " the overridden procedure", proc->name, &where);
8758 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
8761 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
8762 const char* generic_name, locus where)
8767 gcc_assert (t1->specific && t2->specific);
8768 gcc_assert (!t1->specific->is_generic);
8769 gcc_assert (!t2->specific->is_generic);
8771 sym1 = t1->specific->u.specific->n.sym;
8772 sym2 = t2->specific->u.specific->n.sym;
8774 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
8775 if (sym1->attr.subroutine != sym2->attr.subroutine
8776 || sym1->attr.function != sym2->attr.function)
8778 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
8779 " GENERIC '%s' at %L",
8780 sym1->name, sym2->name, generic_name, &where);
8784 /* Compare the interfaces. */
8785 if (gfc_compare_interfaces (sym1, sym2, 1, 0, NULL, 0))
8787 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
8788 sym1->name, sym2->name, generic_name, &where);
8796 /* Worker function for resolving a generic procedure binding; this is used to
8797 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
8799 The difference between those cases is finding possible inherited bindings
8800 that are overridden, as one has to look for them in tb_sym_root,
8801 tb_uop_root or tb_op, respectively. Thus the caller must already find
8802 the super-type and set p->overridden correctly. */
8805 resolve_tb_generic_targets (gfc_symbol* super_type,
8806 gfc_typebound_proc* p, const char* name)
8808 gfc_tbp_generic* target;
8809 gfc_symtree* first_target;
8810 gfc_symtree* inherited;
8812 gcc_assert (p && p->is_generic);
8814 /* Try to find the specific bindings for the symtrees in our target-list. */
8815 gcc_assert (p->u.generic);
8816 for (target = p->u.generic; target; target = target->next)
8817 if (!target->specific)
8819 gfc_typebound_proc* overridden_tbp;
8821 const char* target_name;
8823 target_name = target->specific_st->name;
8825 /* Defined for this type directly. */
8826 if (target->specific_st->n.tb)
8828 target->specific = target->specific_st->n.tb;
8829 goto specific_found;
8832 /* Look for an inherited specific binding. */
8835 inherited = gfc_find_typebound_proc (super_type, NULL,
8840 gcc_assert (inherited->n.tb);
8841 target->specific = inherited->n.tb;
8842 goto specific_found;
8846 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
8847 " at %L", target_name, name, &p->where);
8850 /* Once we've found the specific binding, check it is not ambiguous with
8851 other specifics already found or inherited for the same GENERIC. */
8853 gcc_assert (target->specific);
8855 /* This must really be a specific binding! */
8856 if (target->specific->is_generic)
8858 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
8859 " '%s' is GENERIC, too", name, &p->where, target_name);
8863 /* Check those already resolved on this type directly. */
8864 for (g = p->u.generic; g; g = g->next)
8865 if (g != target && g->specific
8866 && check_generic_tbp_ambiguity (target, g, name, p->where)
8870 /* Check for ambiguity with inherited specific targets. */
8871 for (overridden_tbp = p->overridden; overridden_tbp;
8872 overridden_tbp = overridden_tbp->overridden)
8873 if (overridden_tbp->is_generic)
8875 for (g = overridden_tbp->u.generic; g; g = g->next)
8877 gcc_assert (g->specific);
8878 if (check_generic_tbp_ambiguity (target, g,
8879 name, p->where) == FAILURE)
8885 /* If we attempt to "overwrite" a specific binding, this is an error. */
8886 if (p->overridden && !p->overridden->is_generic)
8888 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
8889 " the same name", name, &p->where);
8893 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
8894 all must have the same attributes here. */
8895 first_target = p->u.generic->specific->u.specific;
8896 gcc_assert (first_target);
8897 p->subroutine = first_target->n.sym->attr.subroutine;
8898 p->function = first_target->n.sym->attr.function;
8904 /* Resolve a GENERIC procedure binding for a derived type. */
8907 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
8909 gfc_symbol* super_type;
8911 /* Find the overridden binding if any. */
8912 st->n.tb->overridden = NULL;
8913 super_type = gfc_get_derived_super_type (derived);
8916 gfc_symtree* overridden;
8917 overridden = gfc_find_typebound_proc (super_type, NULL, st->name, true);
8919 if (overridden && overridden->n.tb)
8920 st->n.tb->overridden = overridden->n.tb;
8923 /* Resolve using worker function. */
8924 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
8928 /* Resolve a type-bound intrinsic operator. */
8931 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
8932 gfc_typebound_proc* p)
8934 gfc_symbol* super_type;
8935 gfc_tbp_generic* target;
8937 /* If there's already an error here, do nothing (but don't fail again). */
8941 /* Operators should always be GENERIC bindings. */
8942 gcc_assert (p->is_generic);
8944 /* Look for an overridden binding. */
8945 super_type = gfc_get_derived_super_type (derived);
8946 if (super_type && super_type->f2k_derived)
8947 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
8950 p->overridden = NULL;
8952 /* Resolve general GENERIC properties using worker function. */
8953 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
8956 /* Check the targets to be procedures of correct interface. */
8957 for (target = p->u.generic; target; target = target->next)
8959 gfc_symbol* target_proc;
8961 gcc_assert (target->specific && !target->specific->is_generic);
8962 target_proc = target->specific->u.specific->n.sym;
8963 gcc_assert (target_proc);
8965 if (!gfc_check_operator_interface (target_proc, op, p->where))
8977 /* Resolve a type-bound user operator (tree-walker callback). */
8979 static gfc_symbol* resolve_bindings_derived;
8980 static gfc_try resolve_bindings_result;
8982 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
8985 resolve_typebound_user_op (gfc_symtree* stree)
8987 gfc_symbol* super_type;
8988 gfc_tbp_generic* target;
8990 gcc_assert (stree && stree->n.tb);
8992 if (stree->n.tb->error)
8995 /* Operators should always be GENERIC bindings. */
8996 gcc_assert (stree->n.tb->is_generic);
8998 /* Find overridden procedure, if any. */
8999 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9000 if (super_type && super_type->f2k_derived)
9002 gfc_symtree* overridden;
9003 overridden = gfc_find_typebound_user_op (super_type, NULL,
9006 if (overridden && overridden->n.tb)
9007 stree->n.tb->overridden = overridden->n.tb;
9010 stree->n.tb->overridden = NULL;
9012 /* Resolve basically using worker function. */
9013 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
9017 /* Check the targets to be functions of correct interface. */
9018 for (target = stree->n.tb->u.generic; target; target = target->next)
9020 gfc_symbol* target_proc;
9022 gcc_assert (target->specific && !target->specific->is_generic);
9023 target_proc = target->specific->u.specific->n.sym;
9024 gcc_assert (target_proc);
9026 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
9033 resolve_bindings_result = FAILURE;
9034 stree->n.tb->error = 1;
9038 /* Resolve the type-bound procedures for a derived type. */
9041 resolve_typebound_procedure (gfc_symtree* stree)
9046 gfc_symbol* super_type;
9047 gfc_component* comp;
9051 /* Undefined specific symbol from GENERIC target definition. */
9055 if (stree->n.tb->error)
9058 /* If this is a GENERIC binding, use that routine. */
9059 if (stree->n.tb->is_generic)
9061 if (resolve_typebound_generic (resolve_bindings_derived, stree)
9067 /* Get the target-procedure to check it. */
9068 gcc_assert (!stree->n.tb->is_generic);
9069 gcc_assert (stree->n.tb->u.specific);
9070 proc = stree->n.tb->u.specific->n.sym;
9071 where = stree->n.tb->where;
9073 /* Default access should already be resolved from the parser. */
9074 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
9076 /* It should be a module procedure or an external procedure with explicit
9077 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
9078 if ((!proc->attr.subroutine && !proc->attr.function)
9079 || (proc->attr.proc != PROC_MODULE
9080 && proc->attr.if_source != IFSRC_IFBODY)
9081 || (proc->attr.abstract && !stree->n.tb->deferred))
9083 gfc_error ("'%s' must be a module procedure or an external procedure with"
9084 " an explicit interface at %L", proc->name, &where);
9087 stree->n.tb->subroutine = proc->attr.subroutine;
9088 stree->n.tb->function = proc->attr.function;
9090 /* Find the super-type of the current derived type. We could do this once and
9091 store in a global if speed is needed, but as long as not I believe this is
9092 more readable and clearer. */
9093 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9095 /* If PASS, resolve and check arguments if not already resolved / loaded
9096 from a .mod file. */
9097 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
9099 if (stree->n.tb->pass_arg)
9101 gfc_formal_arglist* i;
9103 /* If an explicit passing argument name is given, walk the arg-list
9107 stree->n.tb->pass_arg_num = 1;
9108 for (i = proc->formal; i; i = i->next)
9110 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
9115 ++stree->n.tb->pass_arg_num;
9120 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
9122 proc->name, stree->n.tb->pass_arg, &where,
9123 stree->n.tb->pass_arg);
9129 /* Otherwise, take the first one; there should in fact be at least
9131 stree->n.tb->pass_arg_num = 1;
9134 gfc_error ("Procedure '%s' with PASS at %L must have at"
9135 " least one argument", proc->name, &where);
9138 me_arg = proc->formal->sym;
9141 /* Now check that the argument-type matches. */
9142 gcc_assert (me_arg);
9143 if (me_arg->ts.type != BT_DERIVED
9144 || me_arg->ts.derived != resolve_bindings_derived)
9146 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9147 " the derived-type '%s'", me_arg->name, proc->name,
9148 me_arg->name, &where, resolve_bindings_derived->name);
9152 if (!me_arg->ts.is_class)
9154 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9155 " at %L", proc->name, &where);
9160 /* If we are extending some type, check that we don't override a procedure
9161 flagged NON_OVERRIDABLE. */
9162 stree->n.tb->overridden = NULL;
9165 gfc_symtree* overridden;
9166 overridden = gfc_find_typebound_proc (super_type, NULL,
9169 if (overridden && overridden->n.tb)
9170 stree->n.tb->overridden = overridden->n.tb;
9172 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
9176 /* See if there's a name collision with a component directly in this type. */
9177 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
9178 if (!strcmp (comp->name, stree->name))
9180 gfc_error ("Procedure '%s' at %L has the same name as a component of"
9182 stree->name, &where, resolve_bindings_derived->name);
9186 /* Try to find a name collision with an inherited component. */
9187 if (super_type && gfc_find_component (super_type, stree->name, true, true))
9189 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
9190 " component of '%s'",
9191 stree->name, &where, resolve_bindings_derived->name);
9195 stree->n.tb->error = 0;
9199 resolve_bindings_result = FAILURE;
9200 stree->n.tb->error = 1;
9204 resolve_typebound_procedures (gfc_symbol* derived)
9209 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
9212 resolve_bindings_derived = derived;
9213 resolve_bindings_result = SUCCESS;
9215 if (derived->f2k_derived->tb_sym_root)
9216 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
9217 &resolve_typebound_procedure);
9219 found_op = (derived->f2k_derived->tb_uop_root != NULL);
9220 if (derived->f2k_derived->tb_uop_root)
9221 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
9222 &resolve_typebound_user_op);
9224 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
9226 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
9227 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
9229 resolve_bindings_result = FAILURE;
9234 /* FIXME: Remove this (and found_op) once calls are fully implemented. */
9237 gfc_error ("Derived type '%s' at %L contains type-bound OPERATOR's,"
9238 " they are not yet implemented.",
9239 derived->name, &derived->declared_at);
9240 resolve_bindings_result = FAILURE;
9243 return resolve_bindings_result;
9247 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
9248 to give all identical derived types the same backend_decl. */
9250 add_dt_to_dt_list (gfc_symbol *derived)
9252 gfc_dt_list *dt_list;
9254 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
9255 if (derived == dt_list->derived)
9258 if (dt_list == NULL)
9260 dt_list = gfc_get_dt_list ();
9261 dt_list->next = gfc_derived_types;
9262 dt_list->derived = derived;
9263 gfc_derived_types = dt_list;
9268 /* Ensure that a derived-type is really not abstract, meaning that every
9269 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
9272 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
9277 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
9279 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
9282 if (st->n.tb && st->n.tb->deferred)
9284 gfc_symtree* overriding;
9285 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true);
9286 gcc_assert (overriding && overriding->n.tb);
9287 if (overriding->n.tb->deferred)
9289 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
9290 " '%s' is DEFERRED and not overridden",
9291 sub->name, &sub->declared_at, st->name);
9300 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
9302 /* The algorithm used here is to recursively travel up the ancestry of sub
9303 and for each ancestor-type, check all bindings. If any of them is
9304 DEFERRED, look it up starting from sub and see if the found (overriding)
9305 binding is not DEFERRED.
9306 This is not the most efficient way to do this, but it should be ok and is
9307 clearer than something sophisticated. */
9309 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
9311 /* Walk bindings of this ancestor. */
9312 if (ancestor->f2k_derived)
9315 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
9320 /* Find next ancestor type and recurse on it. */
9321 ancestor = gfc_get_derived_super_type (ancestor);
9323 return ensure_not_abstract (sub, ancestor);
9329 static void resolve_symbol (gfc_symbol *sym);
9332 /* Resolve the components of a derived type. */
9335 resolve_fl_derived (gfc_symbol *sym)
9337 gfc_symbol* super_type;
9341 super_type = gfc_get_derived_super_type (sym);
9343 /* Ensure the extended type gets resolved before we do. */
9344 if (super_type && resolve_fl_derived (super_type) == FAILURE)
9347 /* An ABSTRACT type must be extensible. */
9348 if (sym->attr.abstract && !type_is_extensible (sym))
9350 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
9351 sym->name, &sym->declared_at);
9355 for (c = sym->components; c != NULL; c = c->next)
9357 if (c->attr.proc_pointer && c->ts.interface)
9359 if (c->ts.interface->attr.procedure)
9360 gfc_error ("Interface '%s', used by procedure pointer component "
9361 "'%s' at %L, is declared in a later PROCEDURE statement",
9362 c->ts.interface->name, c->name, &c->loc);
9364 /* Get the attributes from the interface (now resolved). */
9365 if (c->ts.interface->attr.if_source
9366 || c->ts.interface->attr.intrinsic)
9368 gfc_symbol *ifc = c->ts.interface;
9370 if (ifc->formal && !ifc->formal_ns)
9371 resolve_symbol (ifc);
9373 if (ifc->attr.intrinsic)
9374 resolve_intrinsic (ifc, &ifc->declared_at);
9378 c->ts = ifc->result->ts;
9379 c->attr.allocatable = ifc->result->attr.allocatable;
9380 c->attr.pointer = ifc->result->attr.pointer;
9381 c->attr.dimension = ifc->result->attr.dimension;
9382 c->as = gfc_copy_array_spec (ifc->result->as);
9387 c->attr.allocatable = ifc->attr.allocatable;
9388 c->attr.pointer = ifc->attr.pointer;
9389 c->attr.dimension = ifc->attr.dimension;
9390 c->as = gfc_copy_array_spec (ifc->as);
9392 c->ts.interface = ifc;
9393 c->attr.function = ifc->attr.function;
9394 c->attr.subroutine = ifc->attr.subroutine;
9395 gfc_copy_formal_args_ppc (c, ifc);
9397 c->attr.pure = ifc->attr.pure;
9398 c->attr.elemental = ifc->attr.elemental;
9399 c->attr.recursive = ifc->attr.recursive;
9400 c->attr.always_explicit = ifc->attr.always_explicit;
9401 c->attr.ext_attr |= ifc->attr.ext_attr;
9402 /* Replace symbols in array spec. */
9406 for (i = 0; i < c->as->rank; i++)
9408 gfc_expr_replace_comp (c->as->lower[i], c);
9409 gfc_expr_replace_comp (c->as->upper[i], c);
9412 /* Copy char length. */
9415 c->ts.cl = gfc_new_charlen (sym->ns);
9416 c->ts.cl->resolved = ifc->ts.cl->resolved;
9417 c->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9418 /* TODO: gfc_expr_replace_symbols (c->ts.cl->length, c);*/
9421 else if (c->ts.interface->name[0] != '\0')
9423 gfc_error ("Interface '%s' of procedure pointer component "
9424 "'%s' at %L must be explicit", c->ts.interface->name,
9429 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
9431 c->ts = *gfc_get_default_type (c->name, NULL);
9432 c->attr.implicit_type = 1;
9435 /* Procedure pointer components: Check PASS arg. */
9436 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
9440 if (c->tb->pass_arg)
9442 gfc_formal_arglist* i;
9444 /* If an explicit passing argument name is given, walk the arg-list
9448 c->tb->pass_arg_num = 1;
9449 for (i = c->formal; i; i = i->next)
9451 if (!strcmp (i->sym->name, c->tb->pass_arg))
9456 c->tb->pass_arg_num++;
9461 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
9462 "at %L has no argument '%s'", c->name,
9463 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
9470 /* Otherwise, take the first one; there should in fact be at least
9472 c->tb->pass_arg_num = 1;
9475 gfc_error ("Procedure pointer component '%s' with PASS at %L "
9476 "must have at least one argument",
9481 me_arg = c->formal->sym;
9484 /* Now check that the argument-type matches. */
9485 gcc_assert (me_arg);
9486 if (me_arg->ts.type != BT_DERIVED
9487 || me_arg->ts.derived != sym)
9489 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
9490 " the derived type '%s'", me_arg->name, c->name,
9491 me_arg->name, &c->loc, sym->name);
9496 /* Check for C453. */
9497 if (me_arg->attr.dimension)
9499 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9500 "must be scalar", me_arg->name, c->name, me_arg->name,
9506 if (me_arg->attr.pointer)
9508 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9509 "may not have the POINTER attribute", me_arg->name,
9510 c->name, me_arg->name, &c->loc);
9515 if (me_arg->attr.allocatable)
9517 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
9518 "may not be ALLOCATABLE", me_arg->name, c->name,
9519 me_arg->name, &c->loc);
9524 if (type_is_extensible (sym) && !me_arg->ts.is_class)
9525 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
9526 " at %L", c->name, &c->loc);
9530 /* Check type-spec if this is not the parent-type component. */
9531 if ((!sym->attr.extension || c != sym->components)
9532 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
9535 /* If this type is an extension, see if this component has the same name
9536 as an inherited type-bound procedure. */
9538 && gfc_find_typebound_proc (super_type, NULL, c->name, true))
9540 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
9541 " inherited type-bound procedure",
9542 c->name, sym->name, &c->loc);
9546 if (c->ts.type == BT_CHARACTER)
9548 if (c->ts.cl->length == NULL
9549 || (resolve_charlen (c->ts.cl) == FAILURE)
9550 || !gfc_is_constant_expr (c->ts.cl->length))
9552 gfc_error ("Character length of component '%s' needs to "
9553 "be a constant specification expression at %L",
9555 c->ts.cl->length ? &c->ts.cl->length->where : &c->loc);
9560 if (c->ts.type == BT_DERIVED
9561 && sym->component_access != ACCESS_PRIVATE
9562 && gfc_check_access (sym->attr.access, sym->ns->default_access)
9563 && !is_sym_host_assoc (c->ts.derived, sym->ns)
9564 && !c->ts.derived->attr.use_assoc
9565 && !gfc_check_access (c->ts.derived->attr.access,
9566 c->ts.derived->ns->default_access)
9567 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
9568 "is a PRIVATE type and cannot be a component of "
9569 "'%s', which is PUBLIC at %L", c->name,
9570 sym->name, &sym->declared_at) == FAILURE)
9573 if (sym->attr.sequence)
9575 if (c->ts.type == BT_DERIVED && c->ts.derived->attr.sequence == 0)
9577 gfc_error ("Component %s of SEQUENCE type declared at %L does "
9578 "not have the SEQUENCE attribute",
9579 c->ts.derived->name, &sym->declared_at);
9584 if (c->ts.type == BT_DERIVED && c->attr.pointer
9585 && c->ts.derived->components == NULL
9586 && !c->ts.derived->attr.zero_comp)
9588 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
9589 "that has not been declared", c->name, sym->name,
9595 if (c->ts.type == BT_DERIVED && c->ts.is_class
9596 && !(c->attr.pointer || c->attr.allocatable))
9598 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
9599 "or pointer", c->name, &c->loc);
9603 /* Ensure that all the derived type components are put on the
9604 derived type list; even in formal namespaces, where derived type
9605 pointer components might not have been declared. */
9606 if (c->ts.type == BT_DERIVED
9608 && c->ts.derived->components
9610 && sym != c->ts.derived)
9611 add_dt_to_dt_list (c->ts.derived);
9613 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
9617 for (i = 0; i < c->as->rank; i++)
9619 if (c->as->lower[i] == NULL
9620 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
9621 || !gfc_is_constant_expr (c->as->lower[i])
9622 || c->as->upper[i] == NULL
9623 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
9624 || !gfc_is_constant_expr (c->as->upper[i]))
9626 gfc_error ("Component '%s' of '%s' at %L must have "
9627 "constant array bounds",
9628 c->name, sym->name, &c->loc);
9634 /* Resolve the type-bound procedures. */
9635 if (resolve_typebound_procedures (sym) == FAILURE)
9638 /* Resolve the finalizer procedures. */
9639 if (gfc_resolve_finalizers (sym) == FAILURE)
9642 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
9643 all DEFERRED bindings are overridden. */
9644 if (super_type && super_type->attr.abstract && !sym->attr.abstract
9645 && ensure_not_abstract (sym, super_type) == FAILURE)
9648 /* Add derived type to the derived type list. */
9649 add_dt_to_dt_list (sym);
9656 resolve_fl_namelist (gfc_symbol *sym)
9661 /* Reject PRIVATE objects in a PUBLIC namelist. */
9662 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
9664 for (nl = sym->namelist; nl; nl = nl->next)
9666 if (!nl->sym->attr.use_assoc
9667 && !is_sym_host_assoc (nl->sym, sym->ns)
9668 && !gfc_check_access(nl->sym->attr.access,
9669 nl->sym->ns->default_access))
9671 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
9672 "cannot be member of PUBLIC namelist '%s' at %L",
9673 nl->sym->name, sym->name, &sym->declared_at);
9677 /* Types with private components that came here by USE-association. */
9678 if (nl->sym->ts.type == BT_DERIVED
9679 && derived_inaccessible (nl->sym->ts.derived))
9681 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
9682 "components and cannot be member of namelist '%s' at %L",
9683 nl->sym->name, sym->name, &sym->declared_at);
9687 /* Types with private components that are defined in the same module. */
9688 if (nl->sym->ts.type == BT_DERIVED
9689 && !is_sym_host_assoc (nl->sym->ts.derived, sym->ns)
9690 && !gfc_check_access (nl->sym->ts.derived->attr.private_comp
9691 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
9692 nl->sym->ns->default_access))
9694 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
9695 "cannot be a member of PUBLIC namelist '%s' at %L",
9696 nl->sym->name, sym->name, &sym->declared_at);
9702 for (nl = sym->namelist; nl; nl = nl->next)
9704 /* Reject namelist arrays of assumed shape. */
9705 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
9706 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
9707 "must not have assumed shape in namelist "
9708 "'%s' at %L", nl->sym->name, sym->name,
9709 &sym->declared_at) == FAILURE)
9712 /* Reject namelist arrays that are not constant shape. */
9713 if (is_non_constant_shape_array (nl->sym))
9715 gfc_error ("NAMELIST array object '%s' must have constant "
9716 "shape in namelist '%s' at %L", nl->sym->name,
9717 sym->name, &sym->declared_at);
9721 /* Namelist objects cannot have allocatable or pointer components. */
9722 if (nl->sym->ts.type != BT_DERIVED)
9725 if (nl->sym->ts.derived->attr.alloc_comp)
9727 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9728 "have ALLOCATABLE components",
9729 nl->sym->name, sym->name, &sym->declared_at);
9733 if (nl->sym->ts.derived->attr.pointer_comp)
9735 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
9736 "have POINTER components",
9737 nl->sym->name, sym->name, &sym->declared_at);
9743 /* 14.1.2 A module or internal procedure represent local entities
9744 of the same type as a namelist member and so are not allowed. */
9745 for (nl = sym->namelist; nl; nl = nl->next)
9747 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
9750 if (nl->sym->attr.function && nl->sym == nl->sym->result)
9751 if ((nl->sym == sym->ns->proc_name)
9753 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
9757 if (nl->sym && nl->sym->name)
9758 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
9759 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
9761 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
9762 "attribute in '%s' at %L", nlsym->name,
9773 resolve_fl_parameter (gfc_symbol *sym)
9775 /* A parameter array's shape needs to be constant. */
9777 && (sym->as->type == AS_DEFERRED
9778 || is_non_constant_shape_array (sym)))
9780 gfc_error ("Parameter array '%s' at %L cannot be automatic "
9781 "or of deferred shape", sym->name, &sym->declared_at);
9785 /* Make sure a parameter that has been implicitly typed still
9786 matches the implicit type, since PARAMETER statements can precede
9787 IMPLICIT statements. */
9788 if (sym->attr.implicit_type
9789 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
9792 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
9793 "later IMPLICIT type", sym->name, &sym->declared_at);
9797 /* Make sure the types of derived parameters are consistent. This
9798 type checking is deferred until resolution because the type may
9799 refer to a derived type from the host. */
9800 if (sym->ts.type == BT_DERIVED
9801 && !gfc_compare_types (&sym->ts, &sym->value->ts))
9803 gfc_error ("Incompatible derived type in PARAMETER at %L",
9804 &sym->value->where);
9811 /* Do anything necessary to resolve a symbol. Right now, we just
9812 assume that an otherwise unknown symbol is a variable. This sort
9813 of thing commonly happens for symbols in module. */
9816 resolve_symbol (gfc_symbol *sym)
9818 int check_constant, mp_flag;
9819 gfc_symtree *symtree;
9820 gfc_symtree *this_symtree;
9824 if (sym->attr.flavor == FL_UNKNOWN)
9827 /* If we find that a flavorless symbol is an interface in one of the
9828 parent namespaces, find its symtree in this namespace, free the
9829 symbol and set the symtree to point to the interface symbol. */
9830 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
9832 symtree = gfc_find_symtree (ns->sym_root, sym->name);
9833 if (symtree && symtree->n.sym->generic)
9835 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
9839 gfc_free_symbol (sym);
9840 symtree->n.sym->refs++;
9841 this_symtree->n.sym = symtree->n.sym;
9846 /* Otherwise give it a flavor according to such attributes as
9848 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
9849 sym->attr.flavor = FL_VARIABLE;
9852 sym->attr.flavor = FL_PROCEDURE;
9853 if (sym->attr.dimension)
9854 sym->attr.function = 1;
9858 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
9859 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
9861 if (sym->attr.procedure && sym->ts.interface
9862 && sym->attr.if_source != IFSRC_DECL)
9864 if (sym->ts.interface == sym)
9866 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
9867 "interface", sym->name, &sym->declared_at);
9870 if (sym->ts.interface->attr.procedure)
9872 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
9873 " in a later PROCEDURE statement", sym->ts.interface->name,
9874 sym->name,&sym->declared_at);
9878 /* Get the attributes from the interface (now resolved). */
9879 if (sym->ts.interface->attr.if_source
9880 || sym->ts.interface->attr.intrinsic)
9882 gfc_symbol *ifc = sym->ts.interface;
9883 resolve_symbol (ifc);
9885 if (ifc->attr.intrinsic)
9886 resolve_intrinsic (ifc, &ifc->declared_at);
9889 sym->ts = ifc->result->ts;
9892 sym->ts.interface = ifc;
9893 sym->attr.function = ifc->attr.function;
9894 sym->attr.subroutine = ifc->attr.subroutine;
9895 gfc_copy_formal_args (sym, ifc);
9897 sym->attr.allocatable = ifc->attr.allocatable;
9898 sym->attr.pointer = ifc->attr.pointer;
9899 sym->attr.pure = ifc->attr.pure;
9900 sym->attr.elemental = ifc->attr.elemental;
9901 sym->attr.dimension = ifc->attr.dimension;
9902 sym->attr.recursive = ifc->attr.recursive;
9903 sym->attr.always_explicit = ifc->attr.always_explicit;
9904 sym->attr.ext_attr |= ifc->attr.ext_attr;
9905 /* Copy array spec. */
9906 sym->as = gfc_copy_array_spec (ifc->as);
9910 for (i = 0; i < sym->as->rank; i++)
9912 gfc_expr_replace_symbols (sym->as->lower[i], sym);
9913 gfc_expr_replace_symbols (sym->as->upper[i], sym);
9916 /* Copy char length. */
9919 sym->ts.cl = gfc_new_charlen (sym->ns);
9920 sym->ts.cl->resolved = ifc->ts.cl->resolved;
9921 sym->ts.cl->length = gfc_copy_expr (ifc->ts.cl->length);
9922 gfc_expr_replace_symbols (sym->ts.cl->length, sym);
9925 else if (sym->ts.interface->name[0] != '\0')
9927 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
9928 sym->ts.interface->name, sym->name, &sym->declared_at);
9933 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
9936 /* Symbols that are module procedures with results (functions) have
9937 the types and array specification copied for type checking in
9938 procedures that call them, as well as for saving to a module
9939 file. These symbols can't stand the scrutiny that their results
9941 mp_flag = (sym->result != NULL && sym->result != sym);
9944 /* Make sure that the intrinsic is consistent with its internal
9945 representation. This needs to be done before assigning a default
9946 type to avoid spurious warnings. */
9947 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic)
9949 gfc_intrinsic_sym* isym;
9952 /* We already know this one is an intrinsic, so we don't call
9953 gfc_is_intrinsic for full checking but rather use gfc_find_function and
9954 gfc_find_subroutine directly to check whether it is a function or
9957 if ((isym = gfc_find_function (sym->name)))
9959 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
9960 && !sym->attr.implicit_type)
9961 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
9962 " ignored", sym->name, &sym->declared_at);
9964 else if ((isym = gfc_find_subroutine (sym->name)))
9966 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
9968 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
9969 " specifier", sym->name, &sym->declared_at);
9975 gfc_error ("'%s' declared INTRINSIC at %L does not exist",
9976 sym->name, &sym->declared_at);
9980 /* Check it is actually available in the standard settings. */
9981 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
9984 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
9985 " available in the current standard settings but %s. Use"
9986 " an appropriate -std=* option or enable -fall-intrinsics"
9987 " in order to use it.",
9988 sym->name, &sym->declared_at, symstd);
9993 /* Assign default type to symbols that need one and don't have one. */
9994 if (sym->ts.type == BT_UNKNOWN)
9996 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
9997 gfc_set_default_type (sym, 1, NULL);
9999 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10000 && !sym->attr.function && !sym->attr.subroutine
10001 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10002 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10004 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10006 /* The specific case of an external procedure should emit an error
10007 in the case that there is no implicit type. */
10009 gfc_set_default_type (sym, sym->attr.external, NULL);
10012 /* Result may be in another namespace. */
10013 resolve_symbol (sym->result);
10015 if (!sym->result->attr.proc_pointer)
10017 sym->ts = sym->result->ts;
10018 sym->as = gfc_copy_array_spec (sym->result->as);
10019 sym->attr.dimension = sym->result->attr.dimension;
10020 sym->attr.pointer = sym->result->attr.pointer;
10021 sym->attr.allocatable = sym->result->attr.allocatable;
10027 /* Assumed size arrays and assumed shape arrays must be dummy
10030 if (sym->as != NULL
10031 && (sym->as->type == AS_ASSUMED_SIZE
10032 || sym->as->type == AS_ASSUMED_SHAPE)
10033 && sym->attr.dummy == 0)
10035 if (sym->as->type == AS_ASSUMED_SIZE)
10036 gfc_error ("Assumed size array at %L must be a dummy argument",
10037 &sym->declared_at);
10039 gfc_error ("Assumed shape array at %L must be a dummy argument",
10040 &sym->declared_at);
10044 /* Make sure symbols with known intent or optional are really dummy
10045 variable. Because of ENTRY statement, this has to be deferred
10046 until resolution time. */
10048 if (!sym->attr.dummy
10049 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
10051 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
10055 if (sym->attr.value && !sym->attr.dummy)
10057 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
10058 "it is not a dummy argument", sym->name, &sym->declared_at);
10062 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
10064 gfc_charlen *cl = sym->ts.cl;
10065 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10067 gfc_error ("Character dummy variable '%s' at %L with VALUE "
10068 "attribute must have constant length",
10069 sym->name, &sym->declared_at);
10073 if (sym->ts.is_c_interop
10074 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
10076 gfc_error ("C interoperable character dummy variable '%s' at %L "
10077 "with VALUE attribute must have length one",
10078 sym->name, &sym->declared_at);
10083 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
10084 do this for something that was implicitly typed because that is handled
10085 in gfc_set_default_type. Handle dummy arguments and procedure
10086 definitions separately. Also, anything that is use associated is not
10087 handled here but instead is handled in the module it is declared in.
10088 Finally, derived type definitions are allowed to be BIND(C) since that
10089 only implies that they're interoperable, and they are checked fully for
10090 interoperability when a variable is declared of that type. */
10091 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
10092 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
10093 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
10095 gfc_try t = SUCCESS;
10097 /* First, make sure the variable is declared at the
10098 module-level scope (J3/04-007, Section 15.3). */
10099 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
10100 sym->attr.in_common == 0)
10102 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
10103 "is neither a COMMON block nor declared at the "
10104 "module level scope", sym->name, &(sym->declared_at));
10107 else if (sym->common_head != NULL)
10109 t = verify_com_block_vars_c_interop (sym->common_head);
10113 /* If type() declaration, we need to verify that the components
10114 of the given type are all C interoperable, etc. */
10115 if (sym->ts.type == BT_DERIVED &&
10116 sym->ts.derived->attr.is_c_interop != 1)
10118 /* Make sure the user marked the derived type as BIND(C). If
10119 not, call the verify routine. This could print an error
10120 for the derived type more than once if multiple variables
10121 of that type are declared. */
10122 if (sym->ts.derived->attr.is_bind_c != 1)
10123 verify_bind_c_derived_type (sym->ts.derived);
10127 /* Verify the variable itself as C interoperable if it
10128 is BIND(C). It is not possible for this to succeed if
10129 the verify_bind_c_derived_type failed, so don't have to handle
10130 any error returned by verify_bind_c_derived_type. */
10131 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10132 sym->common_block);
10137 /* clear the is_bind_c flag to prevent reporting errors more than
10138 once if something failed. */
10139 sym->attr.is_bind_c = 0;
10144 /* If a derived type symbol has reached this point, without its
10145 type being declared, we have an error. Notice that most
10146 conditions that produce undefined derived types have already
10147 been dealt with. However, the likes of:
10148 implicit type(t) (t) ..... call foo (t) will get us here if
10149 the type is not declared in the scope of the implicit
10150 statement. Change the type to BT_UNKNOWN, both because it is so
10151 and to prevent an ICE. */
10152 if (sym->ts.type == BT_DERIVED && sym->ts.derived->components == NULL
10153 && !sym->ts.derived->attr.zero_comp)
10155 gfc_error ("The derived type '%s' at %L is of type '%s', "
10156 "which has not been defined", sym->name,
10157 &sym->declared_at, sym->ts.derived->name);
10158 sym->ts.type = BT_UNKNOWN;
10162 /* Make sure that the derived type has been resolved and that the
10163 derived type is visible in the symbol's namespace, if it is a
10164 module function and is not PRIVATE. */
10165 if (sym->ts.type == BT_DERIVED
10166 && sym->ts.derived->attr.use_assoc
10167 && sym->ns->proc_name
10168 && sym->ns->proc_name->attr.flavor == FL_MODULE)
10172 if (resolve_fl_derived (sym->ts.derived) == FAILURE)
10175 gfc_find_symbol (sym->ts.derived->name, sym->ns, 1, &ds);
10176 if (!ds && sym->attr.function
10177 && gfc_check_access (sym->attr.access, sym->ns->default_access))
10179 symtree = gfc_new_symtree (&sym->ns->sym_root,
10180 sym->ts.derived->name);
10181 symtree->n.sym = sym->ts.derived;
10182 sym->ts.derived->refs++;
10186 /* Unless the derived-type declaration is use associated, Fortran 95
10187 does not allow public entries of private derived types.
10188 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
10189 161 in 95-006r3. */
10190 if (sym->ts.type == BT_DERIVED
10191 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
10192 && !sym->ts.derived->attr.use_assoc
10193 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10194 && !gfc_check_access (sym->ts.derived->attr.access,
10195 sym->ts.derived->ns->default_access)
10196 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
10197 "of PRIVATE derived type '%s'",
10198 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
10199 : "variable", sym->name, &sym->declared_at,
10200 sym->ts.derived->name) == FAILURE)
10203 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
10204 default initialization is defined (5.1.2.4.4). */
10205 if (sym->ts.type == BT_DERIVED
10207 && sym->attr.intent == INTENT_OUT
10209 && sym->as->type == AS_ASSUMED_SIZE)
10211 for (c = sym->ts.derived->components; c; c = c->next)
10213 if (c->initializer)
10215 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
10216 "ASSUMED SIZE and so cannot have a default initializer",
10217 sym->name, &sym->declared_at);
10223 switch (sym->attr.flavor)
10226 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
10231 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
10236 if (resolve_fl_namelist (sym) == FAILURE)
10241 if (resolve_fl_parameter (sym) == FAILURE)
10249 /* Resolve array specifier. Check as well some constraints
10250 on COMMON blocks. */
10252 check_constant = sym->attr.in_common && !sym->attr.pointer;
10254 /* Set the formal_arg_flag so that check_conflict will not throw
10255 an error for host associated variables in the specification
10256 expression for an array_valued function. */
10257 if (sym->attr.function && sym->as)
10258 formal_arg_flag = 1;
10260 gfc_resolve_array_spec (sym->as, check_constant);
10262 formal_arg_flag = 0;
10264 /* Resolve formal namespaces. */
10265 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
10266 && !sym->attr.contained)
10267 gfc_resolve (sym->formal_ns);
10269 /* Make sure the formal namespace is present. */
10270 if (sym->formal && !sym->formal_ns)
10272 gfc_formal_arglist *formal = sym->formal;
10273 while (formal && !formal->sym)
10274 formal = formal->next;
10278 sym->formal_ns = formal->sym->ns;
10279 sym->formal_ns->refs++;
10283 /* Check threadprivate restrictions. */
10284 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
10285 && (!sym->attr.in_common
10286 && sym->module == NULL
10287 && (sym->ns->proc_name == NULL
10288 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
10289 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
10291 /* If we have come this far we can apply default-initializers, as
10292 described in 14.7.5, to those variables that have not already
10293 been assigned one. */
10294 if (sym->ts.type == BT_DERIVED
10295 && sym->attr.referenced
10296 && sym->ns == gfc_current_ns
10298 && !sym->attr.allocatable
10299 && !sym->attr.alloc_comp)
10301 symbol_attribute *a = &sym->attr;
10303 if ((!a->save && !a->dummy && !a->pointer
10304 && !a->in_common && !a->use_assoc
10305 && !(a->function && sym != sym->result))
10306 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
10307 apply_default_init (sym);
10310 /* If this symbol has a type-spec, check it. */
10311 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
10312 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
10313 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
10319 /************* Resolve DATA statements *************/
10323 gfc_data_value *vnode;
10329 /* Advance the values structure to point to the next value in the data list. */
10332 next_data_value (void)
10334 while (mpz_cmp_ui (values.left, 0) == 0)
10336 if (!gfc_is_constant_expr (values.vnode->expr))
10337 gfc_error ("non-constant DATA value at %L",
10338 &values.vnode->expr->where);
10340 if (values.vnode->next == NULL)
10343 values.vnode = values.vnode->next;
10344 mpz_set (values.left, values.vnode->repeat);
10352 check_data_variable (gfc_data_variable *var, locus *where)
10358 ar_type mark = AR_UNKNOWN;
10360 mpz_t section_index[GFC_MAX_DIMENSIONS];
10366 if (gfc_resolve_expr (var->expr) == FAILURE)
10370 mpz_init_set_si (offset, 0);
10373 if (e->expr_type != EXPR_VARIABLE)
10374 gfc_internal_error ("check_data_variable(): Bad expression");
10376 sym = e->symtree->n.sym;
10378 if (sym->ns->is_block_data && !sym->attr.in_common)
10380 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
10381 sym->name, &sym->declared_at);
10384 if (e->ref == NULL && sym->as)
10386 gfc_error ("DATA array '%s' at %L must be specified in a previous"
10387 " declaration", sym->name, where);
10391 has_pointer = sym->attr.pointer;
10393 for (ref = e->ref; ref; ref = ref->next)
10395 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
10399 && ref->type == REF_ARRAY
10400 && ref->u.ar.type != AR_FULL)
10402 gfc_error ("DATA element '%s' at %L is a pointer and so must "
10403 "be a full array", sym->name, where);
10408 if (e->rank == 0 || has_pointer)
10410 mpz_init_set_ui (size, 1);
10417 /* Find the array section reference. */
10418 for (ref = e->ref; ref; ref = ref->next)
10420 if (ref->type != REF_ARRAY)
10422 if (ref->u.ar.type == AR_ELEMENT)
10428 /* Set marks according to the reference pattern. */
10429 switch (ref->u.ar.type)
10437 /* Get the start position of array section. */
10438 gfc_get_section_index (ar, section_index, &offset);
10443 gcc_unreachable ();
10446 if (gfc_array_size (e, &size) == FAILURE)
10448 gfc_error ("Nonconstant array section at %L in DATA statement",
10450 mpz_clear (offset);
10457 while (mpz_cmp_ui (size, 0) > 0)
10459 if (next_data_value () == FAILURE)
10461 gfc_error ("DATA statement at %L has more variables than values",
10467 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
10471 /* If we have more than one element left in the repeat count,
10472 and we have more than one element left in the target variable,
10473 then create a range assignment. */
10474 /* FIXME: Only done for full arrays for now, since array sections
10476 if (mark == AR_FULL && ref && ref->next == NULL
10477 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
10481 if (mpz_cmp (size, values.left) >= 0)
10483 mpz_init_set (range, values.left);
10484 mpz_sub (size, size, values.left);
10485 mpz_set_ui (values.left, 0);
10489 mpz_init_set (range, size);
10490 mpz_sub (values.left, values.left, size);
10491 mpz_set_ui (size, 0);
10494 gfc_assign_data_value_range (var->expr, values.vnode->expr,
10497 mpz_add (offset, offset, range);
10501 /* Assign initial value to symbol. */
10504 mpz_sub_ui (values.left, values.left, 1);
10505 mpz_sub_ui (size, size, 1);
10507 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
10511 if (mark == AR_FULL)
10512 mpz_add_ui (offset, offset, 1);
10514 /* Modify the array section indexes and recalculate the offset
10515 for next element. */
10516 else if (mark == AR_SECTION)
10517 gfc_advance_section (section_index, ar, &offset);
10521 if (mark == AR_SECTION)
10523 for (i = 0; i < ar->dimen; i++)
10524 mpz_clear (section_index[i]);
10528 mpz_clear (offset);
10534 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
10536 /* Iterate over a list of elements in a DATA statement. */
10539 traverse_data_list (gfc_data_variable *var, locus *where)
10542 iterator_stack frame;
10543 gfc_expr *e, *start, *end, *step;
10544 gfc_try retval = SUCCESS;
10546 mpz_init (frame.value);
10548 start = gfc_copy_expr (var->iter.start);
10549 end = gfc_copy_expr (var->iter.end);
10550 step = gfc_copy_expr (var->iter.step);
10552 if (gfc_simplify_expr (start, 1) == FAILURE
10553 || start->expr_type != EXPR_CONSTANT)
10555 gfc_error ("iterator start at %L does not simplify", &start->where);
10559 if (gfc_simplify_expr (end, 1) == FAILURE
10560 || end->expr_type != EXPR_CONSTANT)
10562 gfc_error ("iterator end at %L does not simplify", &end->where);
10566 if (gfc_simplify_expr (step, 1) == FAILURE
10567 || step->expr_type != EXPR_CONSTANT)
10569 gfc_error ("iterator step at %L does not simplify", &step->where);
10574 mpz_init_set (trip, end->value.integer);
10575 mpz_sub (trip, trip, start->value.integer);
10576 mpz_add (trip, trip, step->value.integer);
10578 mpz_div (trip, trip, step->value.integer);
10580 mpz_set (frame.value, start->value.integer);
10582 frame.prev = iter_stack;
10583 frame.variable = var->iter.var->symtree;
10584 iter_stack = &frame;
10586 while (mpz_cmp_ui (trip, 0) > 0)
10588 if (traverse_data_var (var->list, where) == FAILURE)
10595 e = gfc_copy_expr (var->expr);
10596 if (gfc_simplify_expr (e, 1) == FAILURE)
10604 mpz_add (frame.value, frame.value, step->value.integer);
10606 mpz_sub_ui (trip, trip, 1);
10611 mpz_clear (frame.value);
10613 gfc_free_expr (start);
10614 gfc_free_expr (end);
10615 gfc_free_expr (step);
10617 iter_stack = frame.prev;
10622 /* Type resolve variables in the variable list of a DATA statement. */
10625 traverse_data_var (gfc_data_variable *var, locus *where)
10629 for (; var; var = var->next)
10631 if (var->expr == NULL)
10632 t = traverse_data_list (var, where);
10634 t = check_data_variable (var, where);
10644 /* Resolve the expressions and iterators associated with a data statement.
10645 This is separate from the assignment checking because data lists should
10646 only be resolved once. */
10649 resolve_data_variables (gfc_data_variable *d)
10651 for (; d; d = d->next)
10653 if (d->list == NULL)
10655 if (gfc_resolve_expr (d->expr) == FAILURE)
10660 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
10663 if (resolve_data_variables (d->list) == FAILURE)
10672 /* Resolve a single DATA statement. We implement this by storing a pointer to
10673 the value list into static variables, and then recursively traversing the
10674 variables list, expanding iterators and such. */
10677 resolve_data (gfc_data *d)
10680 if (resolve_data_variables (d->var) == FAILURE)
10683 values.vnode = d->value;
10684 if (d->value == NULL)
10685 mpz_set_ui (values.left, 0);
10687 mpz_set (values.left, d->value->repeat);
10689 if (traverse_data_var (d->var, &d->where) == FAILURE)
10692 /* At this point, we better not have any values left. */
10694 if (next_data_value () == SUCCESS)
10695 gfc_error ("DATA statement at %L has more values than variables",
10700 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
10701 accessed by host or use association, is a dummy argument to a pure function,
10702 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
10703 is storage associated with any such variable, shall not be used in the
10704 following contexts: (clients of this function). */
10706 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
10707 procedure. Returns zero if assignment is OK, nonzero if there is a
10710 gfc_impure_variable (gfc_symbol *sym)
10714 if (sym->attr.use_assoc || sym->attr.in_common)
10717 if (sym->ns != gfc_current_ns)
10718 return !sym->attr.function;
10720 proc = sym->ns->proc_name;
10721 if (sym->attr.dummy && gfc_pure (proc)
10722 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
10724 proc->attr.function))
10727 /* TODO: Sort out what can be storage associated, if anything, and include
10728 it here. In principle equivalences should be scanned but it does not
10729 seem to be possible to storage associate an impure variable this way. */
10734 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
10735 symbol of the current procedure. */
10738 gfc_pure (gfc_symbol *sym)
10740 symbol_attribute attr;
10743 sym = gfc_current_ns->proc_name;
10749 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
10753 /* Test whether the current procedure is elemental or not. */
10756 gfc_elemental (gfc_symbol *sym)
10758 symbol_attribute attr;
10761 sym = gfc_current_ns->proc_name;
10766 return attr.flavor == FL_PROCEDURE && attr.elemental;
10770 /* Warn about unused labels. */
10773 warn_unused_fortran_label (gfc_st_label *label)
10778 warn_unused_fortran_label (label->left);
10780 if (label->defined == ST_LABEL_UNKNOWN)
10783 switch (label->referenced)
10785 case ST_LABEL_UNKNOWN:
10786 gfc_warning ("Label %d at %L defined but not used", label->value,
10790 case ST_LABEL_BAD_TARGET:
10791 gfc_warning ("Label %d at %L defined but cannot be used",
10792 label->value, &label->where);
10799 warn_unused_fortran_label (label->right);
10803 /* Returns the sequence type of a symbol or sequence. */
10806 sequence_type (gfc_typespec ts)
10815 if (ts.derived->components == NULL)
10816 return SEQ_NONDEFAULT;
10818 result = sequence_type (ts.derived->components->ts);
10819 for (c = ts.derived->components->next; c; c = c->next)
10820 if (sequence_type (c->ts) != result)
10826 if (ts.kind != gfc_default_character_kind)
10827 return SEQ_NONDEFAULT;
10829 return SEQ_CHARACTER;
10832 if (ts.kind != gfc_default_integer_kind)
10833 return SEQ_NONDEFAULT;
10835 return SEQ_NUMERIC;
10838 if (!(ts.kind == gfc_default_real_kind
10839 || ts.kind == gfc_default_double_kind))
10840 return SEQ_NONDEFAULT;
10842 return SEQ_NUMERIC;
10845 if (ts.kind != gfc_default_complex_kind)
10846 return SEQ_NONDEFAULT;
10848 return SEQ_NUMERIC;
10851 if (ts.kind != gfc_default_logical_kind)
10852 return SEQ_NONDEFAULT;
10854 return SEQ_NUMERIC;
10857 return SEQ_NONDEFAULT;
10862 /* Resolve derived type EQUIVALENCE object. */
10865 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
10868 gfc_component *c = derived->components;
10873 /* Shall not be an object of nonsequence derived type. */
10874 if (!derived->attr.sequence)
10876 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
10877 "attribute to be an EQUIVALENCE object", sym->name,
10882 /* Shall not have allocatable components. */
10883 if (derived->attr.alloc_comp)
10885 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
10886 "components to be an EQUIVALENCE object",sym->name,
10891 if (sym->attr.in_common && has_default_initializer (sym->ts.derived))
10893 gfc_error ("Derived type variable '%s' at %L with default "
10894 "initialization cannot be in EQUIVALENCE with a variable "
10895 "in COMMON", sym->name, &e->where);
10899 for (; c ; c = c->next)
10903 && (resolve_equivalence_derived (c->ts.derived, sym, e) == FAILURE))
10906 /* Shall not be an object of sequence derived type containing a pointer
10907 in the structure. */
10908 if (c->attr.pointer)
10910 gfc_error ("Derived type variable '%s' at %L with pointer "
10911 "component(s) cannot be an EQUIVALENCE object",
10912 sym->name, &e->where);
10920 /* Resolve equivalence object.
10921 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
10922 an allocatable array, an object of nonsequence derived type, an object of
10923 sequence derived type containing a pointer at any level of component
10924 selection, an automatic object, a function name, an entry name, a result
10925 name, a named constant, a structure component, or a subobject of any of
10926 the preceding objects. A substring shall not have length zero. A
10927 derived type shall not have components with default initialization nor
10928 shall two objects of an equivalence group be initialized.
10929 Either all or none of the objects shall have an protected attribute.
10930 The simple constraints are done in symbol.c(check_conflict) and the rest
10931 are implemented here. */
10934 resolve_equivalence (gfc_equiv *eq)
10937 gfc_symbol *derived;
10938 gfc_symbol *first_sym;
10941 locus *last_where = NULL;
10942 seq_type eq_type, last_eq_type;
10943 gfc_typespec *last_ts;
10944 int object, cnt_protected;
10945 const char *value_name;
10949 last_ts = &eq->expr->symtree->n.sym->ts;
10951 first_sym = eq->expr->symtree->n.sym;
10955 for (object = 1; eq; eq = eq->eq, object++)
10959 e->ts = e->symtree->n.sym->ts;
10960 /* match_varspec might not know yet if it is seeing
10961 array reference or substring reference, as it doesn't
10963 if (e->ref && e->ref->type == REF_ARRAY)
10965 gfc_ref *ref = e->ref;
10966 sym = e->symtree->n.sym;
10968 if (sym->attr.dimension)
10970 ref->u.ar.as = sym->as;
10974 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
10975 if (e->ts.type == BT_CHARACTER
10977 && ref->type == REF_ARRAY
10978 && ref->u.ar.dimen == 1
10979 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
10980 && ref->u.ar.stride[0] == NULL)
10982 gfc_expr *start = ref->u.ar.start[0];
10983 gfc_expr *end = ref->u.ar.end[0];
10986 /* Optimize away the (:) reference. */
10987 if (start == NULL && end == NULL)
10990 e->ref = ref->next;
10992 e->ref->next = ref->next;
10997 ref->type = REF_SUBSTRING;
10999 start = gfc_int_expr (1);
11000 ref->u.ss.start = start;
11001 if (end == NULL && e->ts.cl)
11002 end = gfc_copy_expr (e->ts.cl->length);
11003 ref->u.ss.end = end;
11004 ref->u.ss.length = e->ts.cl;
11011 /* Any further ref is an error. */
11014 gcc_assert (ref->type == REF_ARRAY);
11015 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11021 if (gfc_resolve_expr (e) == FAILURE)
11024 sym = e->symtree->n.sym;
11026 if (sym->attr.is_protected)
11028 if (cnt_protected > 0 && cnt_protected != object)
11030 gfc_error ("Either all or none of the objects in the "
11031 "EQUIVALENCE set at %L shall have the "
11032 "PROTECTED attribute",
11037 /* Shall not equivalence common block variables in a PURE procedure. */
11038 if (sym->ns->proc_name
11039 && sym->ns->proc_name->attr.pure
11040 && sym->attr.in_common)
11042 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11043 "object in the pure procedure '%s'",
11044 sym->name, &e->where, sym->ns->proc_name->name);
11048 /* Shall not be a named constant. */
11049 if (e->expr_type == EXPR_CONSTANT)
11051 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
11052 "object", sym->name, &e->where);
11056 derived = e->ts.derived;
11057 if (derived && resolve_equivalence_derived (derived, sym, e) == FAILURE)
11060 /* Check that the types correspond correctly:
11062 A numeric sequence structure may be equivalenced to another sequence
11063 structure, an object of default integer type, default real type, double
11064 precision real type, default logical type such that components of the
11065 structure ultimately only become associated to objects of the same
11066 kind. A character sequence structure may be equivalenced to an object
11067 of default character kind or another character sequence structure.
11068 Other objects may be equivalenced only to objects of the same type and
11069 kind parameters. */
11071 /* Identical types are unconditionally OK. */
11072 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
11073 goto identical_types;
11075 last_eq_type = sequence_type (*last_ts);
11076 eq_type = sequence_type (sym->ts);
11078 /* Since the pair of objects is not of the same type, mixed or
11079 non-default sequences can be rejected. */
11081 msg = "Sequence %s with mixed components in EQUIVALENCE "
11082 "statement at %L with different type objects";
11084 && last_eq_type == SEQ_MIXED
11085 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
11087 || (eq_type == SEQ_MIXED
11088 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11089 &e->where) == FAILURE))
11092 msg = "Non-default type object or sequence %s in EQUIVALENCE "
11093 "statement at %L with objects of different type";
11095 && last_eq_type == SEQ_NONDEFAULT
11096 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
11097 last_where) == FAILURE)
11098 || (eq_type == SEQ_NONDEFAULT
11099 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11100 &e->where) == FAILURE))
11103 msg ="Non-CHARACTER object '%s' in default CHARACTER "
11104 "EQUIVALENCE statement at %L";
11105 if (last_eq_type == SEQ_CHARACTER
11106 && eq_type != SEQ_CHARACTER
11107 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11108 &e->where) == FAILURE)
11111 msg ="Non-NUMERIC object '%s' in default NUMERIC "
11112 "EQUIVALENCE statement at %L";
11113 if (last_eq_type == SEQ_NUMERIC
11114 && eq_type != SEQ_NUMERIC
11115 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11116 &e->where) == FAILURE)
11121 last_where = &e->where;
11126 /* Shall not be an automatic array. */
11127 if (e->ref->type == REF_ARRAY
11128 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
11130 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
11131 "an EQUIVALENCE object", sym->name, &e->where);
11138 /* Shall not be a structure component. */
11139 if (r->type == REF_COMPONENT)
11141 gfc_error ("Structure component '%s' at %L cannot be an "
11142 "EQUIVALENCE object",
11143 r->u.c.component->name, &e->where);
11147 /* A substring shall not have length zero. */
11148 if (r->type == REF_SUBSTRING)
11150 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
11152 gfc_error ("Substring at %L has length zero",
11153 &r->u.ss.start->where);
11163 /* Resolve function and ENTRY types, issue diagnostics if needed. */
11166 resolve_fntype (gfc_namespace *ns)
11168 gfc_entry_list *el;
11171 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
11174 /* If there are any entries, ns->proc_name is the entry master
11175 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
11177 sym = ns->entries->sym;
11179 sym = ns->proc_name;
11180 if (sym->result == sym
11181 && sym->ts.type == BT_UNKNOWN
11182 && gfc_set_default_type (sym, 0, NULL) == FAILURE
11183 && !sym->attr.untyped)
11185 gfc_error ("Function '%s' at %L has no IMPLICIT type",
11186 sym->name, &sym->declared_at);
11187 sym->attr.untyped = 1;
11190 if (sym->ts.type == BT_DERIVED && !sym->ts.derived->attr.use_assoc
11191 && !sym->attr.contained
11192 && !gfc_check_access (sym->ts.derived->attr.access,
11193 sym->ts.derived->ns->default_access)
11194 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11196 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
11197 "%L of PRIVATE type '%s'", sym->name,
11198 &sym->declared_at, sym->ts.derived->name);
11202 for (el = ns->entries->next; el; el = el->next)
11204 if (el->sym->result == el->sym
11205 && el->sym->ts.type == BT_UNKNOWN
11206 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
11207 && !el->sym->attr.untyped)
11209 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
11210 el->sym->name, &el->sym->declared_at);
11211 el->sym->attr.untyped = 1;
11217 /* 12.3.2.1.1 Defined operators. */
11220 check_uop_procedure (gfc_symbol *sym, locus where)
11222 gfc_formal_arglist *formal;
11224 if (!sym->attr.function)
11226 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
11227 sym->name, &where);
11231 if (sym->ts.type == BT_CHARACTER
11232 && !(sym->ts.cl && sym->ts.cl->length)
11233 && !(sym->result && sym->result->ts.cl
11234 && sym->result->ts.cl->length))
11236 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
11237 "character length", sym->name, &where);
11241 formal = sym->formal;
11242 if (!formal || !formal->sym)
11244 gfc_error ("User operator procedure '%s' at %L must have at least "
11245 "one argument", sym->name, &where);
11249 if (formal->sym->attr.intent != INTENT_IN)
11251 gfc_error ("First argument of operator interface at %L must be "
11252 "INTENT(IN)", &where);
11256 if (formal->sym->attr.optional)
11258 gfc_error ("First argument of operator interface at %L cannot be "
11259 "optional", &where);
11263 formal = formal->next;
11264 if (!formal || !formal->sym)
11267 if (formal->sym->attr.intent != INTENT_IN)
11269 gfc_error ("Second argument of operator interface at %L must be "
11270 "INTENT(IN)", &where);
11274 if (formal->sym->attr.optional)
11276 gfc_error ("Second argument of operator interface at %L cannot be "
11277 "optional", &where);
11283 gfc_error ("Operator interface at %L must have, at most, two "
11284 "arguments", &where);
11292 gfc_resolve_uops (gfc_symtree *symtree)
11294 gfc_interface *itr;
11296 if (symtree == NULL)
11299 gfc_resolve_uops (symtree->left);
11300 gfc_resolve_uops (symtree->right);
11302 for (itr = symtree->n.uop->op; itr; itr = itr->next)
11303 check_uop_procedure (itr->sym, itr->sym->declared_at);
11307 /* Examine all of the expressions associated with a program unit,
11308 assign types to all intermediate expressions, make sure that all
11309 assignments are to compatible types and figure out which names
11310 refer to which functions or subroutines. It doesn't check code
11311 block, which is handled by resolve_code. */
11314 resolve_types (gfc_namespace *ns)
11320 gfc_namespace* old_ns = gfc_current_ns;
11322 /* Check that all IMPLICIT types are ok. */
11323 if (!ns->seen_implicit_none)
11326 for (letter = 0; letter != GFC_LETTERS; ++letter)
11327 if (ns->set_flag[letter]
11328 && resolve_typespec_used (&ns->default_type[letter],
11329 &ns->implicit_loc[letter],
11334 gfc_current_ns = ns;
11336 resolve_entries (ns);
11338 resolve_common_vars (ns->blank_common.head, false);
11339 resolve_common_blocks (ns->common_root);
11341 resolve_contained_functions (ns);
11343 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
11345 for (cl = ns->cl_list; cl; cl = cl->next)
11346 resolve_charlen (cl);
11348 gfc_traverse_ns (ns, resolve_symbol);
11350 resolve_fntype (ns);
11352 for (n = ns->contained; n; n = n->sibling)
11354 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
11355 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
11356 "also be PURE", n->proc_name->name,
11357 &n->proc_name->declared_at);
11363 gfc_check_interfaces (ns);
11365 gfc_traverse_ns (ns, resolve_values);
11371 for (d = ns->data; d; d = d->next)
11375 gfc_traverse_ns (ns, gfc_formalize_init_value);
11377 gfc_traverse_ns (ns, gfc_verify_binding_labels);
11379 if (ns->common_root != NULL)
11380 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
11382 for (eq = ns->equiv; eq; eq = eq->next)
11383 resolve_equivalence (eq);
11385 /* Warn about unused labels. */
11386 if (warn_unused_label)
11387 warn_unused_fortran_label (ns->st_labels);
11389 gfc_resolve_uops (ns->uop_root);
11391 gfc_current_ns = old_ns;
11395 /* Call resolve_code recursively. */
11398 resolve_codes (gfc_namespace *ns)
11401 bitmap_obstack old_obstack;
11403 for (n = ns->contained; n; n = n->sibling)
11406 gfc_current_ns = ns;
11408 /* Set to an out of range value. */
11409 current_entry_id = -1;
11411 old_obstack = labels_obstack;
11412 bitmap_obstack_initialize (&labels_obstack);
11414 resolve_code (ns->code, ns);
11416 bitmap_obstack_release (&labels_obstack);
11417 labels_obstack = old_obstack;
11421 /* This function is called after a complete program unit has been compiled.
11422 Its purpose is to examine all of the expressions associated with a program
11423 unit, assign types to all intermediate expressions, make sure that all
11424 assignments are to compatible types and figure out which names refer to
11425 which functions or subroutines. */
11428 gfc_resolve (gfc_namespace *ns)
11430 gfc_namespace *old_ns;
11431 code_stack *old_cs_base;
11437 old_ns = gfc_current_ns;
11438 old_cs_base = cs_base;
11440 resolve_types (ns);
11441 resolve_codes (ns);
11443 gfc_current_ns = old_ns;
11444 cs_base = old_cs_base;