1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
28 #include "arith.h" /* For gfc_compare_expr(). */
29 #include "dependency.h"
31 #include "target-memory.h" /* for gfc_simplify_transfer */
33 /* Types used in equivalence statements. */
37 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
41 /* Stack to keep track of the nesting of blocks as we move through the
42 code. See resolve_branch() and resolve_code(). */
44 typedef struct code_stack
46 struct gfc_code *head, *current;
47 struct code_stack *prev;
49 /* This bitmap keeps track of the targets valid for a branch from
50 inside this block except for END {IF|SELECT}s of enclosing
52 bitmap reachable_labels;
56 static code_stack *cs_base = NULL;
59 /* Nonzero if we're inside a FORALL block. */
61 static int forall_flag;
63 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
65 static int omp_workshare_flag;
67 /* Nonzero if we are processing a formal arglist. The corresponding function
68 resets the flag each time that it is read. */
69 static int formal_arg_flag = 0;
71 /* True if we are resolving a specification expression. */
72 static int specification_expr = 0;
74 /* The id of the last entry seen. */
75 static int current_entry_id;
77 /* We use bitmaps to determine if a branch target is valid. */
78 static bitmap_obstack labels_obstack;
81 gfc_is_formal_arg (void)
83 return formal_arg_flag;
86 /* Is the symbol host associated? */
88 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
90 for (ns = ns->parent; ns; ns = ns->parent)
99 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
100 an ABSTRACT derived-type. If where is not NULL, an error message with that
101 locus is printed, optionally using name. */
104 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
106 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
111 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
112 name, where, ts->u.derived->name);
114 gfc_error ("ABSTRACT type '%s' used at %L",
115 ts->u.derived->name, where);
125 /* Resolve types of formal argument lists. These have to be done early so that
126 the formal argument lists of module procedures can be copied to the
127 containing module before the individual procedures are resolved
128 individually. We also resolve argument lists of procedures in interface
129 blocks because they are self-contained scoping units.
131 Since a dummy argument cannot be a non-dummy procedure, the only
132 resort left for untyped names are the IMPLICIT types. */
135 resolve_formal_arglist (gfc_symbol *proc)
137 gfc_formal_arglist *f;
141 if (proc->result != NULL)
146 if (gfc_elemental (proc)
147 || sym->attr.pointer || sym->attr.allocatable
148 || (sym->as && sym->as->rank > 0))
150 proc->attr.always_explicit = 1;
151 sym->attr.always_explicit = 1;
156 for (f = proc->formal; f; f = f->next)
162 /* Alternate return placeholder. */
163 if (gfc_elemental (proc))
164 gfc_error ("Alternate return specifier in elemental subroutine "
165 "'%s' at %L is not allowed", proc->name,
167 if (proc->attr.function)
168 gfc_error ("Alternate return specifier in function "
169 "'%s' at %L is not allowed", proc->name,
174 if (sym->attr.if_source != IFSRC_UNKNOWN)
175 resolve_formal_arglist (sym);
177 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
179 if (gfc_pure (proc) && !gfc_pure (sym))
181 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
182 "also be PURE", sym->name, &sym->declared_at);
186 if (gfc_elemental (proc))
188 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
189 "procedure", &sym->declared_at);
193 if (sym->attr.function
194 && sym->ts.type == BT_UNKNOWN
195 && sym->attr.intrinsic)
197 gfc_intrinsic_sym *isym;
198 isym = gfc_find_function (sym->name);
199 if (isym == NULL || !isym->specific)
201 gfc_error ("Unable to find a specific INTRINSIC procedure "
202 "for the reference '%s' at %L", sym->name,
211 if (sym->ts.type == BT_UNKNOWN)
213 if (!sym->attr.function || sym->result == sym)
214 gfc_set_default_type (sym, 1, sym->ns);
217 gfc_resolve_array_spec (sym->as, 0);
219 /* We can't tell if an array with dimension (:) is assumed or deferred
220 shape until we know if it has the pointer or allocatable attributes.
222 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
223 && !(sym->attr.pointer || sym->attr.allocatable))
225 sym->as->type = AS_ASSUMED_SHAPE;
226 for (i = 0; i < sym->as->rank; i++)
227 sym->as->lower[i] = gfc_int_expr (1);
230 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
231 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
232 || sym->attr.optional)
234 proc->attr.always_explicit = 1;
236 proc->result->attr.always_explicit = 1;
239 /* If the flavor is unknown at this point, it has to be a variable.
240 A procedure specification would have already set the type. */
242 if (sym->attr.flavor == FL_UNKNOWN)
243 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
245 if (gfc_pure (proc) && !sym->attr.pointer
246 && sym->attr.flavor != FL_PROCEDURE)
248 if (proc->attr.function && sym->attr.intent != INTENT_IN)
249 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
250 "INTENT(IN)", sym->name, proc->name,
253 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
254 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
255 "have its INTENT specified", sym->name, proc->name,
259 if (gfc_elemental (proc))
263 gfc_error ("Argument '%s' of elemental procedure at %L must "
264 "be scalar", sym->name, &sym->declared_at);
268 if (sym->attr.pointer)
270 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
271 "have the POINTER attribute", sym->name,
276 if (sym->attr.flavor == FL_PROCEDURE)
278 gfc_error ("Dummy procedure '%s' not allowed in elemental "
279 "procedure '%s' at %L", sym->name, proc->name,
285 /* Each dummy shall be specified to be scalar. */
286 if (proc->attr.proc == PROC_ST_FUNCTION)
290 gfc_error ("Argument '%s' of statement function at %L must "
291 "be scalar", sym->name, &sym->declared_at);
295 if (sym->ts.type == BT_CHARACTER)
297 gfc_charlen *cl = sym->ts.u.cl;
298 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
300 gfc_error ("Character-valued argument '%s' of statement "
301 "function at %L must have constant length",
302 sym->name, &sym->declared_at);
312 /* Work function called when searching for symbols that have argument lists
313 associated with them. */
316 find_arglists (gfc_symbol *sym)
318 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
321 resolve_formal_arglist (sym);
325 /* Given a namespace, resolve all formal argument lists within the namespace.
329 resolve_formal_arglists (gfc_namespace *ns)
334 gfc_traverse_ns (ns, find_arglists);
339 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
343 /* If this namespace is not a function or an entry master function,
345 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
346 || sym->attr.entry_master)
349 /* Try to find out of what the return type is. */
350 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
352 t = gfc_set_default_type (sym->result, 0, ns);
354 if (t == FAILURE && !sym->result->attr.untyped)
356 if (sym->result == sym)
357 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
358 sym->name, &sym->declared_at);
359 else if (!sym->result->attr.proc_pointer)
360 gfc_error ("Result '%s' of contained function '%s' at %L has "
361 "no IMPLICIT type", sym->result->name, sym->name,
362 &sym->result->declared_at);
363 sym->result->attr.untyped = 1;
367 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
368 type, lists the only ways a character length value of * can be used:
369 dummy arguments of procedures, named constants, and function results
370 in external functions. Internal function results and results of module
371 procedures are not on this list, ergo, not permitted. */
373 if (sym->result->ts.type == BT_CHARACTER)
375 gfc_charlen *cl = sym->result->ts.u.cl;
376 if (!cl || !cl->length)
378 /* See if this is a module-procedure and adapt error message
381 gcc_assert (ns->parent && ns->parent->proc_name);
382 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
384 gfc_error ("Character-valued %s '%s' at %L must not be"
386 module_proc ? _("module procedure")
387 : _("internal function"),
388 sym->name, &sym->declared_at);
394 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
395 introduce duplicates. */
398 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
400 gfc_formal_arglist *f, *new_arglist;
403 for (; new_args != NULL; new_args = new_args->next)
405 new_sym = new_args->sym;
406 /* See if this arg is already in the formal argument list. */
407 for (f = proc->formal; f; f = f->next)
409 if (new_sym == f->sym)
416 /* Add a new argument. Argument order is not important. */
417 new_arglist = gfc_get_formal_arglist ();
418 new_arglist->sym = new_sym;
419 new_arglist->next = proc->formal;
420 proc->formal = new_arglist;
425 /* Flag the arguments that are not present in all entries. */
428 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
430 gfc_formal_arglist *f, *head;
433 for (f = proc->formal; f; f = f->next)
438 for (new_args = head; new_args; new_args = new_args->next)
440 if (new_args->sym == f->sym)
447 f->sym->attr.not_always_present = 1;
452 /* Resolve alternate entry points. If a symbol has multiple entry points we
453 create a new master symbol for the main routine, and turn the existing
454 symbol into an entry point. */
457 resolve_entries (gfc_namespace *ns)
459 gfc_namespace *old_ns;
463 char name[GFC_MAX_SYMBOL_LEN + 1];
464 static int master_count = 0;
466 if (ns->proc_name == NULL)
469 /* No need to do anything if this procedure doesn't have alternate entry
474 /* We may already have resolved alternate entry points. */
475 if (ns->proc_name->attr.entry_master)
478 /* If this isn't a procedure something has gone horribly wrong. */
479 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
481 /* Remember the current namespace. */
482 old_ns = gfc_current_ns;
486 /* Add the main entry point to the list of entry points. */
487 el = gfc_get_entry_list ();
488 el->sym = ns->proc_name;
490 el->next = ns->entries;
492 ns->proc_name->attr.entry = 1;
494 /* If it is a module function, it needs to be in the right namespace
495 so that gfc_get_fake_result_decl can gather up the results. The
496 need for this arose in get_proc_name, where these beasts were
497 left in their own namespace, to keep prior references linked to
498 the entry declaration.*/
499 if (ns->proc_name->attr.function
500 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
503 /* Do the same for entries where the master is not a module
504 procedure. These are retained in the module namespace because
505 of the module procedure declaration. */
506 for (el = el->next; el; el = el->next)
507 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
508 && el->sym->attr.mod_proc)
512 /* Add an entry statement for it. */
519 /* Create a new symbol for the master function. */
520 /* Give the internal function a unique name (within this file).
521 Also include the function name so the user has some hope of figuring
522 out what is going on. */
523 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
524 master_count++, ns->proc_name->name);
525 gfc_get_ha_symbol (name, &proc);
526 gcc_assert (proc != NULL);
528 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
529 if (ns->proc_name->attr.subroutine)
530 gfc_add_subroutine (&proc->attr, proc->name, NULL);
534 gfc_typespec *ts, *fts;
535 gfc_array_spec *as, *fas;
536 gfc_add_function (&proc->attr, proc->name, NULL);
538 fas = ns->entries->sym->as;
539 fas = fas ? fas : ns->entries->sym->result->as;
540 fts = &ns->entries->sym->result->ts;
541 if (fts->type == BT_UNKNOWN)
542 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
543 for (el = ns->entries->next; el; el = el->next)
545 ts = &el->sym->result->ts;
547 as = as ? as : el->sym->result->as;
548 if (ts->type == BT_UNKNOWN)
549 ts = gfc_get_default_type (el->sym->result->name, NULL);
551 if (! gfc_compare_types (ts, fts)
552 || (el->sym->result->attr.dimension
553 != ns->entries->sym->result->attr.dimension)
554 || (el->sym->result->attr.pointer
555 != ns->entries->sym->result->attr.pointer))
557 else if (as && fas && ns->entries->sym->result != el->sym->result
558 && gfc_compare_array_spec (as, fas) == 0)
559 gfc_error ("Function %s at %L has entries with mismatched "
560 "array specifications", ns->entries->sym->name,
561 &ns->entries->sym->declared_at);
562 /* The characteristics need to match and thus both need to have
563 the same string length, i.e. both len=*, or both len=4.
564 Having both len=<variable> is also possible, but difficult to
565 check at compile time. */
566 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
567 && (((ts->u.cl->length && !fts->u.cl->length)
568 ||(!ts->u.cl->length && fts->u.cl->length))
570 && ts->u.cl->length->expr_type
571 != fts->u.cl->length->expr_type)
573 && ts->u.cl->length->expr_type == EXPR_CONSTANT
574 && mpz_cmp (ts->u.cl->length->value.integer,
575 fts->u.cl->length->value.integer) != 0)))
576 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
577 "entries returning variables of different "
578 "string lengths", ns->entries->sym->name,
579 &ns->entries->sym->declared_at);
584 sym = ns->entries->sym->result;
585 /* All result types the same. */
587 if (sym->attr.dimension)
588 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
589 if (sym->attr.pointer)
590 gfc_add_pointer (&proc->attr, NULL);
594 /* Otherwise the result will be passed through a union by
596 proc->attr.mixed_entry_master = 1;
597 for (el = ns->entries; el; el = el->next)
599 sym = el->sym->result;
600 if (sym->attr.dimension)
602 if (el == ns->entries)
603 gfc_error ("FUNCTION result %s can't be an array in "
604 "FUNCTION %s at %L", sym->name,
605 ns->entries->sym->name, &sym->declared_at);
607 gfc_error ("ENTRY result %s can't be an array in "
608 "FUNCTION %s at %L", sym->name,
609 ns->entries->sym->name, &sym->declared_at);
611 else if (sym->attr.pointer)
613 if (el == ns->entries)
614 gfc_error ("FUNCTION result %s can't be a POINTER in "
615 "FUNCTION %s at %L", sym->name,
616 ns->entries->sym->name, &sym->declared_at);
618 gfc_error ("ENTRY result %s can't be a POINTER in "
619 "FUNCTION %s at %L", sym->name,
620 ns->entries->sym->name, &sym->declared_at);
625 if (ts->type == BT_UNKNOWN)
626 ts = gfc_get_default_type (sym->name, NULL);
630 if (ts->kind == gfc_default_integer_kind)
634 if (ts->kind == gfc_default_real_kind
635 || ts->kind == gfc_default_double_kind)
639 if (ts->kind == gfc_default_complex_kind)
643 if (ts->kind == gfc_default_logical_kind)
647 /* We will issue error elsewhere. */
655 if (el == ns->entries)
656 gfc_error ("FUNCTION result %s can't be of type %s "
657 "in FUNCTION %s at %L", sym->name,
658 gfc_typename (ts), ns->entries->sym->name,
661 gfc_error ("ENTRY result %s can't be of type %s "
662 "in FUNCTION %s at %L", sym->name,
663 gfc_typename (ts), ns->entries->sym->name,
670 proc->attr.access = ACCESS_PRIVATE;
671 proc->attr.entry_master = 1;
673 /* Merge all the entry point arguments. */
674 for (el = ns->entries; el; el = el->next)
675 merge_argument_lists (proc, el->sym->formal);
677 /* Check the master formal arguments for any that are not
678 present in all entry points. */
679 for (el = ns->entries; el; el = el->next)
680 check_argument_lists (proc, el->sym->formal);
682 /* Use the master function for the function body. */
683 ns->proc_name = proc;
685 /* Finalize the new symbols. */
686 gfc_commit_symbols ();
688 /* Restore the original namespace. */
689 gfc_current_ns = old_ns;
694 has_default_initializer (gfc_symbol *der)
698 gcc_assert (der->attr.flavor == FL_DERIVED);
699 for (c = der->components; c; c = c->next)
700 if ((c->ts.type != BT_DERIVED && c->initializer)
701 || (c->ts.type == BT_DERIVED
702 && (!c->attr.pointer && has_default_initializer (c->ts.u.derived))))
708 /* Resolve common variables. */
710 resolve_common_vars (gfc_symbol *sym, bool named_common)
712 gfc_symbol *csym = sym;
714 for (; csym; csym = csym->common_next)
716 if (csym->value || csym->attr.data)
718 if (!csym->ns->is_block_data)
719 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
720 "but only in BLOCK DATA initialization is "
721 "allowed", csym->name, &csym->declared_at);
722 else if (!named_common)
723 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
724 "in a blank COMMON but initialization is only "
725 "allowed in named common blocks", csym->name,
729 if (csym->ts.type != BT_DERIVED)
732 if (!(csym->ts.u.derived->attr.sequence
733 || csym->ts.u.derived->attr.is_bind_c))
734 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
735 "has neither the SEQUENCE nor the BIND(C) "
736 "attribute", csym->name, &csym->declared_at);
737 if (csym->ts.u.derived->attr.alloc_comp)
738 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
739 "has an ultimate component that is "
740 "allocatable", csym->name, &csym->declared_at);
741 if (has_default_initializer (csym->ts.u.derived))
742 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
743 "may not have default initializer", csym->name,
746 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
747 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
751 /* Resolve common blocks. */
753 resolve_common_blocks (gfc_symtree *common_root)
757 if (common_root == NULL)
760 if (common_root->left)
761 resolve_common_blocks (common_root->left);
762 if (common_root->right)
763 resolve_common_blocks (common_root->right);
765 resolve_common_vars (common_root->n.common->head, true);
767 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
771 if (sym->attr.flavor == FL_PARAMETER)
772 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
773 sym->name, &common_root->n.common->where, &sym->declared_at);
775 if (sym->attr.intrinsic)
776 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
777 sym->name, &common_root->n.common->where);
778 else if (sym->attr.result
779 || gfc_is_function_return_value (sym, gfc_current_ns))
780 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
781 "that is also a function result", sym->name,
782 &common_root->n.common->where);
783 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
784 && sym->attr.proc != PROC_ST_FUNCTION)
785 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
786 "that is also a global procedure", sym->name,
787 &common_root->n.common->where);
791 /* Resolve contained function types. Because contained functions can call one
792 another, they have to be worked out before any of the contained procedures
795 The good news is that if a function doesn't already have a type, the only
796 way it can get one is through an IMPLICIT type or a RESULT variable, because
797 by definition contained functions are contained namespace they're contained
798 in, not in a sibling or parent namespace. */
801 resolve_contained_functions (gfc_namespace *ns)
803 gfc_namespace *child;
806 resolve_formal_arglists (ns);
808 for (child = ns->contained; child; child = child->sibling)
810 /* Resolve alternate entry points first. */
811 resolve_entries (child);
813 /* Then check function return types. */
814 resolve_contained_fntype (child->proc_name, child);
815 for (el = child->entries; el; el = el->next)
816 resolve_contained_fntype (el->sym, child);
821 /* Resolve all of the elements of a structure constructor and make sure that
822 the types are correct. */
825 resolve_structure_cons (gfc_expr *expr)
827 gfc_constructor *cons;
833 cons = expr->value.constructor;
834 /* A constructor may have references if it is the result of substituting a
835 parameter variable. In this case we just pull out the component we
838 comp = expr->ref->u.c.sym->components;
840 comp = expr->ts.u.derived->components;
842 /* See if the user is trying to invoke a structure constructor for one of
843 the iso_c_binding derived types. */
844 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
845 && expr->ts.u.derived->ts.is_iso_c && cons && cons->expr != NULL)
847 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
848 expr->ts.u.derived->name, &(expr->where));
852 for (; comp; comp = comp->next, cons = cons->next)
859 if (gfc_resolve_expr (cons->expr) == FAILURE)
865 rank = comp->as ? comp->as->rank : 0;
866 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
867 && (comp->attr.allocatable || cons->expr->rank))
869 gfc_error ("The rank of the element in the derived type "
870 "constructor at %L does not match that of the "
871 "component (%d/%d)", &cons->expr->where,
872 cons->expr->rank, rank);
876 /* If we don't have the right type, try to convert it. */
878 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
881 if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
882 gfc_error ("The element in the derived type constructor at %L, "
883 "for pointer component '%s', is %s but should be %s",
884 &cons->expr->where, comp->name,
885 gfc_basic_typename (cons->expr->ts.type),
886 gfc_basic_typename (comp->ts.type));
888 t = gfc_convert_type (cons->expr, &comp->ts, 1);
891 if (cons->expr->expr_type == EXPR_NULL
892 && !(comp->attr.pointer || comp->attr.allocatable
893 || comp->attr.proc_pointer
894 || (comp->ts.type == BT_CLASS
895 && (comp->ts.u.derived->components->attr.pointer
896 || comp->ts.u.derived->components->attr.allocatable))))
899 gfc_error ("The NULL in the derived type constructor at %L is "
900 "being applied to component '%s', which is neither "
901 "a POINTER nor ALLOCATABLE", &cons->expr->where,
905 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
908 a = gfc_expr_attr (cons->expr);
910 if (!a.pointer && !a.target)
913 gfc_error ("The element in the derived type constructor at %L, "
914 "for pointer component '%s' should be a POINTER or "
915 "a TARGET", &cons->expr->where, comp->name);
923 /****************** Expression name resolution ******************/
925 /* Returns 0 if a symbol was not declared with a type or
926 attribute declaration statement, nonzero otherwise. */
929 was_declared (gfc_symbol *sym)
935 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
938 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
939 || a.optional || a.pointer || a.save || a.target || a.volatile_
940 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
948 /* Determine if a symbol is generic or not. */
951 generic_sym (gfc_symbol *sym)
955 if (sym->attr.generic ||
956 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
959 if (was_declared (sym) || sym->ns->parent == NULL)
962 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
969 return generic_sym (s);
976 /* Determine if a symbol is specific or not. */
979 specific_sym (gfc_symbol *sym)
983 if (sym->attr.if_source == IFSRC_IFBODY
984 || sym->attr.proc == PROC_MODULE
985 || sym->attr.proc == PROC_INTERNAL
986 || sym->attr.proc == PROC_ST_FUNCTION
987 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
988 || sym->attr.external)
991 if (was_declared (sym) || sym->ns->parent == NULL)
994 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
996 return (s == NULL) ? 0 : specific_sym (s);
1000 /* Figure out if the procedure is specific, generic or unknown. */
1003 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1007 procedure_kind (gfc_symbol *sym)
1009 if (generic_sym (sym))
1010 return PTYPE_GENERIC;
1012 if (specific_sym (sym))
1013 return PTYPE_SPECIFIC;
1015 return PTYPE_UNKNOWN;
1018 /* Check references to assumed size arrays. The flag need_full_assumed_size
1019 is nonzero when matching actual arguments. */
1021 static int need_full_assumed_size = 0;
1024 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1026 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1029 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1030 What should it be? */
1031 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1032 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1033 && (e->ref->u.ar.type == AR_FULL))
1035 gfc_error ("The upper bound in the last dimension must "
1036 "appear in the reference to the assumed size "
1037 "array '%s' at %L", sym->name, &e->where);
1044 /* Look for bad assumed size array references in argument expressions
1045 of elemental and array valued intrinsic procedures. Since this is
1046 called from procedure resolution functions, it only recurses at
1050 resolve_assumed_size_actual (gfc_expr *e)
1055 switch (e->expr_type)
1058 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1063 if (resolve_assumed_size_actual (e->value.op.op1)
1064 || resolve_assumed_size_actual (e->value.op.op2))
1075 /* Check a generic procedure, passed as an actual argument, to see if
1076 there is a matching specific name. If none, it is an error, and if
1077 more than one, the reference is ambiguous. */
1079 count_specific_procs (gfc_expr *e)
1086 sym = e->symtree->n.sym;
1088 for (p = sym->generic; p; p = p->next)
1089 if (strcmp (sym->name, p->sym->name) == 0)
1091 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1097 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1101 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1102 "argument at %L", sym->name, &e->where);
1108 /* See if a call to sym could possibly be a not allowed RECURSION because of
1109 a missing RECURIVE declaration. This means that either sym is the current
1110 context itself, or sym is the parent of a contained procedure calling its
1111 non-RECURSIVE containing procedure.
1112 This also works if sym is an ENTRY. */
1115 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1117 gfc_symbol* proc_sym;
1118 gfc_symbol* context_proc;
1119 gfc_namespace* real_context;
1121 if (sym->attr.flavor == FL_PROGRAM)
1124 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1126 /* If we've got an ENTRY, find real procedure. */
1127 if (sym->attr.entry && sym->ns->entries)
1128 proc_sym = sym->ns->entries->sym;
1132 /* If sym is RECURSIVE, all is well of course. */
1133 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1136 /* Find the context procedure's "real" symbol if it has entries.
1137 We look for a procedure symbol, so recurse on the parents if we don't
1138 find one (like in case of a BLOCK construct). */
1139 for (real_context = context; ; real_context = real_context->parent)
1141 /* We should find something, eventually! */
1142 gcc_assert (real_context);
1144 context_proc = (real_context->entries ? real_context->entries->sym
1145 : real_context->proc_name);
1147 /* In some special cases, there may not be a proc_name, like for this
1149 real(bad_kind()) function foo () ...
1150 when checking the call to bad_kind ().
1151 In these cases, we simply return here and assume that the
1156 if (context_proc->attr.flavor != FL_LABEL)
1160 /* A call from sym's body to itself is recursion, of course. */
1161 if (context_proc == proc_sym)
1164 /* The same is true if context is a contained procedure and sym the
1166 if (context_proc->attr.contained)
1168 gfc_symbol* parent_proc;
1170 gcc_assert (context->parent);
1171 parent_proc = (context->parent->entries ? context->parent->entries->sym
1172 : context->parent->proc_name);
1174 if (parent_proc == proc_sym)
1182 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1183 its typespec and formal argument list. */
1186 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1188 gfc_intrinsic_sym* isym;
1194 /* We already know this one is an intrinsic, so we don't call
1195 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1196 gfc_find_subroutine directly to check whether it is a function or
1199 if ((isym = gfc_find_function (sym->name)))
1201 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1202 && !sym->attr.implicit_type)
1203 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1204 " ignored", sym->name, &sym->declared_at);
1206 if (!sym->attr.function &&
1207 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1212 else if ((isym = gfc_find_subroutine (sym->name)))
1214 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1216 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1217 " specifier", sym->name, &sym->declared_at);
1221 if (!sym->attr.subroutine &&
1222 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1227 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1232 gfc_copy_formal_args_intr (sym, isym);
1234 /* Check it is actually available in the standard settings. */
1235 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1238 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1239 " available in the current standard settings but %s. Use"
1240 " an appropriate -std=* option or enable -fall-intrinsics"
1241 " in order to use it.",
1242 sym->name, &sym->declared_at, symstd);
1250 /* Resolve a procedure expression, like passing it to a called procedure or as
1251 RHS for a procedure pointer assignment. */
1254 resolve_procedure_expression (gfc_expr* expr)
1258 if (expr->expr_type != EXPR_VARIABLE)
1260 gcc_assert (expr->symtree);
1262 sym = expr->symtree->n.sym;
1264 if (sym->attr.intrinsic)
1265 resolve_intrinsic (sym, &expr->where);
1267 if (sym->attr.flavor != FL_PROCEDURE
1268 || (sym->attr.function && sym->result == sym))
1271 /* A non-RECURSIVE procedure that is used as procedure expression within its
1272 own body is in danger of being called recursively. */
1273 if (is_illegal_recursion (sym, gfc_current_ns))
1274 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1275 " itself recursively. Declare it RECURSIVE or use"
1276 " -frecursive", sym->name, &expr->where);
1282 /* Resolve an actual argument list. Most of the time, this is just
1283 resolving the expressions in the list.
1284 The exception is that we sometimes have to decide whether arguments
1285 that look like procedure arguments are really simple variable
1289 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1290 bool no_formal_args)
1293 gfc_symtree *parent_st;
1295 int save_need_full_assumed_size;
1296 gfc_component *comp;
1298 for (; arg; arg = arg->next)
1303 /* Check the label is a valid branching target. */
1306 if (arg->label->defined == ST_LABEL_UNKNOWN)
1308 gfc_error ("Label %d referenced at %L is never defined",
1309 arg->label->value, &arg->label->where);
1316 if (gfc_is_proc_ptr_comp (e, &comp))
1319 if (e->expr_type == EXPR_PPC)
1321 if (comp->as != NULL)
1322 e->rank = comp->as->rank;
1323 e->expr_type = EXPR_FUNCTION;
1325 if (gfc_resolve_expr (e) == FAILURE)
1330 if (e->expr_type == EXPR_VARIABLE
1331 && e->symtree->n.sym->attr.generic
1333 && count_specific_procs (e) != 1)
1336 if (e->ts.type != BT_PROCEDURE)
1338 save_need_full_assumed_size = need_full_assumed_size;
1339 if (e->expr_type != EXPR_VARIABLE)
1340 need_full_assumed_size = 0;
1341 if (gfc_resolve_expr (e) != SUCCESS)
1343 need_full_assumed_size = save_need_full_assumed_size;
1347 /* See if the expression node should really be a variable reference. */
1349 sym = e->symtree->n.sym;
1351 if (sym->attr.flavor == FL_PROCEDURE
1352 || sym->attr.intrinsic
1353 || sym->attr.external)
1357 /* If a procedure is not already determined to be something else
1358 check if it is intrinsic. */
1359 if (!sym->attr.intrinsic
1360 && !(sym->attr.external || sym->attr.use_assoc
1361 || sym->attr.if_source == IFSRC_IFBODY)
1362 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1363 sym->attr.intrinsic = 1;
1365 if (sym->attr.proc == PROC_ST_FUNCTION)
1367 gfc_error ("Statement function '%s' at %L is not allowed as an "
1368 "actual argument", sym->name, &e->where);
1371 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1372 sym->attr.subroutine);
1373 if (sym->attr.intrinsic && actual_ok == 0)
1375 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1376 "actual argument", sym->name, &e->where);
1379 if (sym->attr.contained && !sym->attr.use_assoc
1380 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1382 gfc_error ("Internal procedure '%s' is not allowed as an "
1383 "actual argument at %L", sym->name, &e->where);
1386 if (sym->attr.elemental && !sym->attr.intrinsic)
1388 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1389 "allowed as an actual argument at %L", sym->name,
1393 /* Check if a generic interface has a specific procedure
1394 with the same name before emitting an error. */
1395 if (sym->attr.generic && count_specific_procs (e) != 1)
1398 /* Just in case a specific was found for the expression. */
1399 sym = e->symtree->n.sym;
1401 /* If the symbol is the function that names the current (or
1402 parent) scope, then we really have a variable reference. */
1404 if (gfc_is_function_return_value (sym, sym->ns))
1407 /* If all else fails, see if we have a specific intrinsic. */
1408 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1410 gfc_intrinsic_sym *isym;
1412 isym = gfc_find_function (sym->name);
1413 if (isym == NULL || !isym->specific)
1415 gfc_error ("Unable to find a specific INTRINSIC procedure "
1416 "for the reference '%s' at %L", sym->name,
1421 sym->attr.intrinsic = 1;
1422 sym->attr.function = 1;
1425 if (gfc_resolve_expr (e) == FAILURE)
1430 /* See if the name is a module procedure in a parent unit. */
1432 if (was_declared (sym) || sym->ns->parent == NULL)
1435 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1437 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1441 if (parent_st == NULL)
1444 sym = parent_st->n.sym;
1445 e->symtree = parent_st; /* Point to the right thing. */
1447 if (sym->attr.flavor == FL_PROCEDURE
1448 || sym->attr.intrinsic
1449 || sym->attr.external)
1451 if (gfc_resolve_expr (e) == FAILURE)
1457 e->expr_type = EXPR_VARIABLE;
1459 if (sym->as != NULL)
1461 e->rank = sym->as->rank;
1462 e->ref = gfc_get_ref ();
1463 e->ref->type = REF_ARRAY;
1464 e->ref->u.ar.type = AR_FULL;
1465 e->ref->u.ar.as = sym->as;
1468 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1469 primary.c (match_actual_arg). If above code determines that it
1470 is a variable instead, it needs to be resolved as it was not
1471 done at the beginning of this function. */
1472 save_need_full_assumed_size = need_full_assumed_size;
1473 if (e->expr_type != EXPR_VARIABLE)
1474 need_full_assumed_size = 0;
1475 if (gfc_resolve_expr (e) != SUCCESS)
1477 need_full_assumed_size = save_need_full_assumed_size;
1480 /* Check argument list functions %VAL, %LOC and %REF. There is
1481 nothing to do for %REF. */
1482 if (arg->name && arg->name[0] == '%')
1484 if (strncmp ("%VAL", arg->name, 4) == 0)
1486 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1488 gfc_error ("By-value argument at %L is not of numeric "
1495 gfc_error ("By-value argument at %L cannot be an array or "
1496 "an array section", &e->where);
1500 /* Intrinsics are still PROC_UNKNOWN here. However,
1501 since same file external procedures are not resolvable
1502 in gfortran, it is a good deal easier to leave them to
1504 if (ptype != PROC_UNKNOWN
1505 && ptype != PROC_DUMMY
1506 && ptype != PROC_EXTERNAL
1507 && ptype != PROC_MODULE)
1509 gfc_error ("By-value argument at %L is not allowed "
1510 "in this context", &e->where);
1515 /* Statement functions have already been excluded above. */
1516 else if (strncmp ("%LOC", arg->name, 4) == 0
1517 && e->ts.type == BT_PROCEDURE)
1519 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1521 gfc_error ("Passing internal procedure at %L by location "
1522 "not allowed", &e->where);
1533 /* Do the checks of the actual argument list that are specific to elemental
1534 procedures. If called with c == NULL, we have a function, otherwise if
1535 expr == NULL, we have a subroutine. */
1538 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1540 gfc_actual_arglist *arg0;
1541 gfc_actual_arglist *arg;
1542 gfc_symbol *esym = NULL;
1543 gfc_intrinsic_sym *isym = NULL;
1545 gfc_intrinsic_arg *iformal = NULL;
1546 gfc_formal_arglist *eformal = NULL;
1547 bool formal_optional = false;
1548 bool set_by_optional = false;
1552 /* Is this an elemental procedure? */
1553 if (expr && expr->value.function.actual != NULL)
1555 if (expr->value.function.esym != NULL
1556 && expr->value.function.esym->attr.elemental)
1558 arg0 = expr->value.function.actual;
1559 esym = expr->value.function.esym;
1561 else if (expr->value.function.isym != NULL
1562 && expr->value.function.isym->elemental)
1564 arg0 = expr->value.function.actual;
1565 isym = expr->value.function.isym;
1570 else if (c && c->ext.actual != NULL)
1572 arg0 = c->ext.actual;
1574 if (c->resolved_sym)
1575 esym = c->resolved_sym;
1577 esym = c->symtree->n.sym;
1580 if (!esym->attr.elemental)
1586 /* The rank of an elemental is the rank of its array argument(s). */
1587 for (arg = arg0; arg; arg = arg->next)
1589 if (arg->expr != NULL && arg->expr->rank > 0)
1591 rank = arg->expr->rank;
1592 if (arg->expr->expr_type == EXPR_VARIABLE
1593 && arg->expr->symtree->n.sym->attr.optional)
1594 set_by_optional = true;
1596 /* Function specific; set the result rank and shape. */
1600 if (!expr->shape && arg->expr->shape)
1602 expr->shape = gfc_get_shape (rank);
1603 for (i = 0; i < rank; i++)
1604 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1611 /* If it is an array, it shall not be supplied as an actual argument
1612 to an elemental procedure unless an array of the same rank is supplied
1613 as an actual argument corresponding to a nonoptional dummy argument of
1614 that elemental procedure(12.4.1.5). */
1615 formal_optional = false;
1617 iformal = isym->formal;
1619 eformal = esym->formal;
1621 for (arg = arg0; arg; arg = arg->next)
1625 if (eformal->sym && eformal->sym->attr.optional)
1626 formal_optional = true;
1627 eformal = eformal->next;
1629 else if (isym && iformal)
1631 if (iformal->optional)
1632 formal_optional = true;
1633 iformal = iformal->next;
1636 formal_optional = true;
1638 if (pedantic && arg->expr != NULL
1639 && arg->expr->expr_type == EXPR_VARIABLE
1640 && arg->expr->symtree->n.sym->attr.optional
1643 && (set_by_optional || arg->expr->rank != rank)
1644 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1646 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1647 "MISSING, it cannot be the actual argument of an "
1648 "ELEMENTAL procedure unless there is a non-optional "
1649 "argument with the same rank (12.4.1.5)",
1650 arg->expr->symtree->n.sym->name, &arg->expr->where);
1655 for (arg = arg0; arg; arg = arg->next)
1657 if (arg->expr == NULL || arg->expr->rank == 0)
1660 /* Being elemental, the last upper bound of an assumed size array
1661 argument must be present. */
1662 if (resolve_assumed_size_actual (arg->expr))
1665 /* Elemental procedure's array actual arguments must conform. */
1668 if (gfc_check_conformance (arg->expr, e,
1669 "elemental procedure") == FAILURE)
1676 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1677 is an array, the intent inout/out variable needs to be also an array. */
1678 if (rank > 0 && esym && expr == NULL)
1679 for (eformal = esym->formal, arg = arg0; arg && eformal;
1680 arg = arg->next, eformal = eformal->next)
1681 if ((eformal->sym->attr.intent == INTENT_OUT
1682 || eformal->sym->attr.intent == INTENT_INOUT)
1683 && arg->expr && arg->expr->rank == 0)
1685 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1686 "ELEMENTAL subroutine '%s' is a scalar, but another "
1687 "actual argument is an array", &arg->expr->where,
1688 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1689 : "INOUT", eformal->sym->name, esym->name);
1696 /* Go through each actual argument in ACTUAL and see if it can be
1697 implemented as an inlined, non-copying intrinsic. FNSYM is the
1698 function being called, or NULL if not known. */
1701 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1703 gfc_actual_arglist *ap;
1706 for (ap = actual; ap; ap = ap->next)
1708 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1709 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1711 ap->expr->inline_noncopying_intrinsic = 1;
1715 /* This function does the checking of references to global procedures
1716 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1717 77 and 95 standards. It checks for a gsymbol for the name, making
1718 one if it does not already exist. If it already exists, then the
1719 reference being resolved must correspond to the type of gsymbol.
1720 Otherwise, the new symbol is equipped with the attributes of the
1721 reference. The corresponding code that is called in creating
1722 global entities is parse.c.
1724 In addition, for all but -std=legacy, the gsymbols are used to
1725 check the interfaces of external procedures from the same file.
1726 The namespace of the gsymbol is resolved and then, once this is
1727 done the interface is checked. */
1731 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1733 if (!gsym_ns->proc_name->attr.recursive)
1736 if (sym->ns == gsym_ns)
1739 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1746 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1748 if (gsym_ns->entries)
1750 gfc_entry_list *entry = gsym_ns->entries;
1752 for (; entry; entry = entry->next)
1754 if (strcmp (sym->name, entry->sym->name) == 0)
1756 if (strcmp (gsym_ns->proc_name->name,
1757 sym->ns->proc_name->name) == 0)
1761 && strcmp (gsym_ns->proc_name->name,
1762 sym->ns->parent->proc_name->name) == 0)
1771 resolve_global_procedure (gfc_symbol *sym, locus *where,
1772 gfc_actual_arglist **actual, int sub)
1776 enum gfc_symbol_type type;
1778 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1780 gsym = gfc_get_gsymbol (sym->name);
1782 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1783 gfc_global_used (gsym, where);
1785 if (gfc_option.flag_whole_file
1786 && sym->attr.if_source == IFSRC_UNKNOWN
1787 && gsym->type != GSYM_UNKNOWN
1789 && gsym->ns->resolved != -1
1790 && gsym->ns->proc_name
1791 && not_in_recursive (sym, gsym->ns)
1792 && not_entry_self_reference (sym, gsym->ns))
1794 /* Make sure that translation for the gsymbol occurs before
1795 the procedure currently being resolved. */
1796 ns = gsym->ns->resolved ? NULL : gfc_global_ns_list;
1797 for (; ns && ns != gsym->ns; ns = ns->sibling)
1799 if (ns->sibling == gsym->ns)
1801 ns->sibling = gsym->ns->sibling;
1802 gsym->ns->sibling = gfc_global_ns_list;
1803 gfc_global_ns_list = gsym->ns;
1808 if (!gsym->ns->resolved)
1810 gfc_dt_list *old_dt_list;
1812 /* Stash away derived types so that the backend_decls do not
1814 old_dt_list = gfc_derived_types;
1815 gfc_derived_types = NULL;
1817 gfc_resolve (gsym->ns);
1819 /* Store the new derived types with the global namespace. */
1820 if (gfc_derived_types)
1821 gsym->ns->derived_types = gfc_derived_types;
1823 /* Restore the derived types of this namespace. */
1824 gfc_derived_types = old_dt_list;
1827 if (gsym->ns->proc_name->attr.function
1828 && gsym->ns->proc_name->as
1829 && gsym->ns->proc_name->as->rank
1830 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1831 gfc_error ("The reference to function '%s' at %L either needs an "
1832 "explicit INTERFACE or the rank is incorrect", sym->name,
1835 /* Non-assumed length character functions. */
1836 if (sym->attr.function && sym->ts.type == BT_CHARACTER
1837 && gsym->ns->proc_name->ts.u.cl->length != NULL)
1839 gfc_charlen *cl = sym->ts.u.cl;
1841 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1842 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1844 gfc_error ("Nonconstant character-length function '%s' at %L "
1845 "must have an explicit interface", sym->name,
1850 if (gfc_option.flag_whole_file == 1
1851 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1853 !(gfc_option.warn_std & GFC_STD_GNU)))
1854 gfc_errors_to_warnings (1);
1856 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1858 gfc_errors_to_warnings (0);
1861 if (gsym->type == GSYM_UNKNOWN)
1864 gsym->where = *where;
1871 /************* Function resolution *************/
1873 /* Resolve a function call known to be generic.
1874 Section 14.1.2.4.1. */
1877 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1881 if (sym->attr.generic)
1883 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1886 expr->value.function.name = s->name;
1887 expr->value.function.esym = s;
1889 if (s->ts.type != BT_UNKNOWN)
1891 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1892 expr->ts = s->result->ts;
1895 expr->rank = s->as->rank;
1896 else if (s->result != NULL && s->result->as != NULL)
1897 expr->rank = s->result->as->rank;
1899 gfc_set_sym_referenced (expr->value.function.esym);
1904 /* TODO: Need to search for elemental references in generic
1908 if (sym->attr.intrinsic)
1909 return gfc_intrinsic_func_interface (expr, 0);
1916 resolve_generic_f (gfc_expr *expr)
1921 sym = expr->symtree->n.sym;
1925 m = resolve_generic_f0 (expr, sym);
1928 else if (m == MATCH_ERROR)
1932 if (sym->ns->parent == NULL)
1934 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1938 if (!generic_sym (sym))
1942 /* Last ditch attempt. See if the reference is to an intrinsic
1943 that possesses a matching interface. 14.1.2.4 */
1944 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
1946 gfc_error ("There is no specific function for the generic '%s' at %L",
1947 expr->symtree->n.sym->name, &expr->where);
1951 m = gfc_intrinsic_func_interface (expr, 0);
1955 gfc_error ("Generic function '%s' at %L is not consistent with a "
1956 "specific intrinsic interface", expr->symtree->n.sym->name,
1963 /* Resolve a function call known to be specific. */
1966 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1970 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1972 if (sym->attr.dummy)
1974 sym->attr.proc = PROC_DUMMY;
1978 sym->attr.proc = PROC_EXTERNAL;
1982 if (sym->attr.proc == PROC_MODULE
1983 || sym->attr.proc == PROC_ST_FUNCTION
1984 || sym->attr.proc == PROC_INTERNAL)
1987 if (sym->attr.intrinsic)
1989 m = gfc_intrinsic_func_interface (expr, 1);
1993 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1994 "with an intrinsic", sym->name, &expr->where);
2002 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2005 expr->ts = sym->result->ts;
2008 expr->value.function.name = sym->name;
2009 expr->value.function.esym = sym;
2010 if (sym->as != NULL)
2011 expr->rank = sym->as->rank;
2018 resolve_specific_f (gfc_expr *expr)
2023 sym = expr->symtree->n.sym;
2027 m = resolve_specific_f0 (sym, expr);
2030 if (m == MATCH_ERROR)
2033 if (sym->ns->parent == NULL)
2036 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2042 gfc_error ("Unable to resolve the specific function '%s' at %L",
2043 expr->symtree->n.sym->name, &expr->where);
2049 /* Resolve a procedure call not known to be generic nor specific. */
2052 resolve_unknown_f (gfc_expr *expr)
2057 sym = expr->symtree->n.sym;
2059 if (sym->attr.dummy)
2061 sym->attr.proc = PROC_DUMMY;
2062 expr->value.function.name = sym->name;
2066 /* See if we have an intrinsic function reference. */
2068 if (gfc_is_intrinsic (sym, 0, expr->where))
2070 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2075 /* The reference is to an external name. */
2077 sym->attr.proc = PROC_EXTERNAL;
2078 expr->value.function.name = sym->name;
2079 expr->value.function.esym = expr->symtree->n.sym;
2081 if (sym->as != NULL)
2082 expr->rank = sym->as->rank;
2084 /* Type of the expression is either the type of the symbol or the
2085 default type of the symbol. */
2088 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2090 if (sym->ts.type != BT_UNKNOWN)
2094 ts = gfc_get_default_type (sym->name, sym->ns);
2096 if (ts->type == BT_UNKNOWN)
2098 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2099 sym->name, &expr->where);
2110 /* Return true, if the symbol is an external procedure. */
2112 is_external_proc (gfc_symbol *sym)
2114 if (!sym->attr.dummy && !sym->attr.contained
2115 && !(sym->attr.intrinsic
2116 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2117 && sym->attr.proc != PROC_ST_FUNCTION
2118 && !sym->attr.use_assoc
2126 /* Figure out if a function reference is pure or not. Also set the name
2127 of the function for a potential error message. Return nonzero if the
2128 function is PURE, zero if not. */
2130 pure_stmt_function (gfc_expr *, gfc_symbol *);
2133 pure_function (gfc_expr *e, const char **name)
2139 if (e->symtree != NULL
2140 && e->symtree->n.sym != NULL
2141 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2142 return pure_stmt_function (e, e->symtree->n.sym);
2144 if (e->value.function.esym)
2146 pure = gfc_pure (e->value.function.esym);
2147 *name = e->value.function.esym->name;
2149 else if (e->value.function.isym)
2151 pure = e->value.function.isym->pure
2152 || e->value.function.isym->elemental;
2153 *name = e->value.function.isym->name;
2157 /* Implicit functions are not pure. */
2159 *name = e->value.function.name;
2167 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2168 int *f ATTRIBUTE_UNUSED)
2172 /* Don't bother recursing into other statement functions
2173 since they will be checked individually for purity. */
2174 if (e->expr_type != EXPR_FUNCTION
2176 || e->symtree->n.sym == sym
2177 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2180 return pure_function (e, &name) ? false : true;
2185 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2187 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2192 is_scalar_expr_ptr (gfc_expr *expr)
2194 gfc_try retval = SUCCESS;
2199 /* See if we have a gfc_ref, which means we have a substring, array
2200 reference, or a component. */
2201 if (expr->ref != NULL)
2204 while (ref->next != NULL)
2210 if (ref->u.ss.length != NULL
2211 && ref->u.ss.length->length != NULL
2213 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2215 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2217 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2218 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2219 if (end - start + 1 != 1)
2226 if (ref->u.ar.type == AR_ELEMENT)
2228 else if (ref->u.ar.type == AR_FULL)
2230 /* The user can give a full array if the array is of size 1. */
2231 if (ref->u.ar.as != NULL
2232 && ref->u.ar.as->rank == 1
2233 && ref->u.ar.as->type == AS_EXPLICIT
2234 && ref->u.ar.as->lower[0] != NULL
2235 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2236 && ref->u.ar.as->upper[0] != NULL
2237 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2239 /* If we have a character string, we need to check if
2240 its length is one. */
2241 if (expr->ts.type == BT_CHARACTER)
2243 if (expr->ts.u.cl == NULL
2244 || expr->ts.u.cl->length == NULL
2245 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2251 /* We have constant lower and upper bounds. If the
2252 difference between is 1, it can be considered a
2254 start = (int) mpz_get_si
2255 (ref->u.ar.as->lower[0]->value.integer);
2256 end = (int) mpz_get_si
2257 (ref->u.ar.as->upper[0]->value.integer);
2258 if (end - start + 1 != 1)
2273 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2275 /* Character string. Make sure it's of length 1. */
2276 if (expr->ts.u.cl == NULL
2277 || expr->ts.u.cl->length == NULL
2278 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2281 else if (expr->rank != 0)
2288 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2289 and, in the case of c_associated, set the binding label based on
2293 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2294 gfc_symbol **new_sym)
2296 char name[GFC_MAX_SYMBOL_LEN + 1];
2297 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2298 int optional_arg = 0, is_pointer = 0;
2299 gfc_try retval = SUCCESS;
2300 gfc_symbol *args_sym;
2301 gfc_typespec *arg_ts;
2303 if (args->expr->expr_type == EXPR_CONSTANT
2304 || args->expr->expr_type == EXPR_OP
2305 || args->expr->expr_type == EXPR_NULL)
2307 gfc_error ("Argument to '%s' at %L is not a variable",
2308 sym->name, &(args->expr->where));
2312 args_sym = args->expr->symtree->n.sym;
2314 /* The typespec for the actual arg should be that stored in the expr
2315 and not necessarily that of the expr symbol (args_sym), because
2316 the actual expression could be a part-ref of the expr symbol. */
2317 arg_ts = &(args->expr->ts);
2319 is_pointer = gfc_is_data_pointer (args->expr);
2321 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2323 /* If the user gave two args then they are providing something for
2324 the optional arg (the second cptr). Therefore, set the name and
2325 binding label to the c_associated for two cptrs. Otherwise,
2326 set c_associated to expect one cptr. */
2330 sprintf (name, "%s_2", sym->name);
2331 sprintf (binding_label, "%s_2", sym->binding_label);
2337 sprintf (name, "%s_1", sym->name);
2338 sprintf (binding_label, "%s_1", sym->binding_label);
2342 /* Get a new symbol for the version of c_associated that
2344 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2346 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2347 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2349 sprintf (name, "%s", sym->name);
2350 sprintf (binding_label, "%s", sym->binding_label);
2352 /* Error check the call. */
2353 if (args->next != NULL)
2355 gfc_error_now ("More actual than formal arguments in '%s' "
2356 "call at %L", name, &(args->expr->where));
2359 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2361 /* Make sure we have either the target or pointer attribute. */
2362 if (!args_sym->attr.target && !is_pointer)
2364 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2365 "a TARGET or an associated pointer",
2367 sym->name, &(args->expr->where));
2371 /* See if we have interoperable type and type param. */
2372 if (verify_c_interop (arg_ts) == SUCCESS
2373 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2375 if (args_sym->attr.target == 1)
2377 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2378 has the target attribute and is interoperable. */
2379 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2380 allocatable variable that has the TARGET attribute and
2381 is not an array of zero size. */
2382 if (args_sym->attr.allocatable == 1)
2384 if (args_sym->attr.dimension != 0
2385 && (args_sym->as && args_sym->as->rank == 0))
2387 gfc_error_now ("Allocatable variable '%s' used as a "
2388 "parameter to '%s' at %L must not be "
2389 "an array of zero size",
2390 args_sym->name, sym->name,
2391 &(args->expr->where));
2397 /* A non-allocatable target variable with C
2398 interoperable type and type parameters must be
2400 if (args_sym && args_sym->attr.dimension)
2402 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2404 gfc_error ("Assumed-shape array '%s' at %L "
2405 "cannot be an argument to the "
2406 "procedure '%s' because "
2407 "it is not C interoperable",
2409 &(args->expr->where), sym->name);
2412 else if (args_sym->as->type == AS_DEFERRED)
2414 gfc_error ("Deferred-shape array '%s' at %L "
2415 "cannot be an argument to the "
2416 "procedure '%s' because "
2417 "it is not C interoperable",
2419 &(args->expr->where), sym->name);
2424 /* Make sure it's not a character string. Arrays of
2425 any type should be ok if the variable is of a C
2426 interoperable type. */
2427 if (arg_ts->type == BT_CHARACTER)
2428 if (arg_ts->u.cl != NULL
2429 && (arg_ts->u.cl->length == NULL
2430 || arg_ts->u.cl->length->expr_type
2433 (arg_ts->u.cl->length->value.integer, 1)
2435 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2437 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2438 "at %L must have a length of 1",
2439 args_sym->name, sym->name,
2440 &(args->expr->where));
2446 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2448 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2450 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2451 "associated scalar POINTER", args_sym->name,
2452 sym->name, &(args->expr->where));
2458 /* The parameter is not required to be C interoperable. If it
2459 is not C interoperable, it must be a nonpolymorphic scalar
2460 with no length type parameters. It still must have either
2461 the pointer or target attribute, and it can be
2462 allocatable (but must be allocated when c_loc is called). */
2463 if (args->expr->rank != 0
2464 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2466 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2467 "scalar", args_sym->name, sym->name,
2468 &(args->expr->where));
2471 else if (arg_ts->type == BT_CHARACTER
2472 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2474 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2475 "%L must have a length of 1",
2476 args_sym->name, sym->name,
2477 &(args->expr->where));
2482 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2484 if (args_sym->attr.flavor != FL_PROCEDURE)
2486 /* TODO: Update this error message to allow for procedure
2487 pointers once they are implemented. */
2488 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2490 args_sym->name, sym->name,
2491 &(args->expr->where));
2494 else if (args_sym->attr.is_bind_c != 1)
2496 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2498 args_sym->name, sym->name,
2499 &(args->expr->where));
2504 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2509 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2510 "iso_c_binding function: '%s'!\n", sym->name);
2517 /* Resolve a function call, which means resolving the arguments, then figuring
2518 out which entity the name refers to. */
2519 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2520 to INTENT(OUT) or INTENT(INOUT). */
2523 resolve_function (gfc_expr *expr)
2525 gfc_actual_arglist *arg;
2530 procedure_type p = PROC_INTRINSIC;
2531 bool no_formal_args;
2535 sym = expr->symtree->n.sym;
2537 /* If this is a procedure pointer component, it has already been resolved. */
2538 if (gfc_is_proc_ptr_comp (expr, NULL))
2541 if (sym && sym->attr.intrinsic
2542 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2545 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2547 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2551 /* If this ia a deferred TBP with an abstract interface (which may
2552 of course be referenced), expr->value.function.name will be set. */
2553 if (sym && sym->attr.abstract && !expr->value.function.name)
2555 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2556 sym->name, &expr->where);
2560 /* Switch off assumed size checking and do this again for certain kinds
2561 of procedure, once the procedure itself is resolved. */
2562 need_full_assumed_size++;
2564 if (expr->symtree && expr->symtree->n.sym)
2565 p = expr->symtree->n.sym->attr.proc;
2567 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2568 if (resolve_actual_arglist (expr->value.function.actual,
2569 p, no_formal_args) == FAILURE)
2572 /* Need to setup the call to the correct c_associated, depending on
2573 the number of cptrs to user gives to compare. */
2574 if (sym && sym->attr.is_iso_c == 1)
2576 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2580 /* Get the symtree for the new symbol (resolved func).
2581 the old one will be freed later, when it's no longer used. */
2582 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2585 /* Resume assumed_size checking. */
2586 need_full_assumed_size--;
2588 /* If the procedure is external, check for usage. */
2589 if (sym && is_external_proc (sym))
2590 resolve_global_procedure (sym, &expr->where,
2591 &expr->value.function.actual, 0);
2593 if (sym && sym->ts.type == BT_CHARACTER
2595 && sym->ts.u.cl->length == NULL
2597 && expr->value.function.esym == NULL
2598 && !sym->attr.contained)
2600 /* Internal procedures are taken care of in resolve_contained_fntype. */
2601 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2602 "be used at %L since it is not a dummy argument",
2603 sym->name, &expr->where);
2607 /* See if function is already resolved. */
2609 if (expr->value.function.name != NULL)
2611 if (expr->ts.type == BT_UNKNOWN)
2617 /* Apply the rules of section 14.1.2. */
2619 switch (procedure_kind (sym))
2622 t = resolve_generic_f (expr);
2625 case PTYPE_SPECIFIC:
2626 t = resolve_specific_f (expr);
2630 t = resolve_unknown_f (expr);
2634 gfc_internal_error ("resolve_function(): bad function type");
2638 /* If the expression is still a function (it might have simplified),
2639 then we check to see if we are calling an elemental function. */
2641 if (expr->expr_type != EXPR_FUNCTION)
2644 temp = need_full_assumed_size;
2645 need_full_assumed_size = 0;
2647 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2650 if (omp_workshare_flag
2651 && expr->value.function.esym
2652 && ! gfc_elemental (expr->value.function.esym))
2654 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2655 "in WORKSHARE construct", expr->value.function.esym->name,
2660 #define GENERIC_ID expr->value.function.isym->id
2661 else if (expr->value.function.actual != NULL
2662 && expr->value.function.isym != NULL
2663 && GENERIC_ID != GFC_ISYM_LBOUND
2664 && GENERIC_ID != GFC_ISYM_LEN
2665 && GENERIC_ID != GFC_ISYM_LOC
2666 && GENERIC_ID != GFC_ISYM_PRESENT)
2668 /* Array intrinsics must also have the last upper bound of an
2669 assumed size array argument. UBOUND and SIZE have to be
2670 excluded from the check if the second argument is anything
2673 for (arg = expr->value.function.actual; arg; arg = arg->next)
2675 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2676 && arg->next != NULL && arg->next->expr)
2678 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2681 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2684 if ((int)mpz_get_si (arg->next->expr->value.integer)
2689 if (arg->expr != NULL
2690 && arg->expr->rank > 0
2691 && resolve_assumed_size_actual (arg->expr))
2697 need_full_assumed_size = temp;
2700 if (!pure_function (expr, &name) && name)
2704 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2705 "FORALL %s", name, &expr->where,
2706 forall_flag == 2 ? "mask" : "block");
2709 else if (gfc_pure (NULL))
2711 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2712 "procedure within a PURE procedure", name, &expr->where);
2717 /* Functions without the RECURSIVE attribution are not allowed to
2718 * call themselves. */
2719 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2722 esym = expr->value.function.esym;
2724 if (is_illegal_recursion (esym, gfc_current_ns))
2726 if (esym->attr.entry && esym->ns->entries)
2727 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2728 " function '%s' is not RECURSIVE",
2729 esym->name, &expr->where, esym->ns->entries->sym->name);
2731 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2732 " is not RECURSIVE", esym->name, &expr->where);
2738 /* Character lengths of use associated functions may contains references to
2739 symbols not referenced from the current program unit otherwise. Make sure
2740 those symbols are marked as referenced. */
2742 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2743 && expr->value.function.esym->attr.use_assoc)
2745 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2749 && !((expr->value.function.esym
2750 && expr->value.function.esym->attr.elemental)
2752 (expr->value.function.isym
2753 && expr->value.function.isym->elemental)))
2754 find_noncopying_intrinsics (expr->value.function.esym,
2755 expr->value.function.actual);
2757 /* Make sure that the expression has a typespec that works. */
2758 if (expr->ts.type == BT_UNKNOWN)
2760 if (expr->symtree->n.sym->result
2761 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2762 && !expr->symtree->n.sym->result->attr.proc_pointer)
2763 expr->ts = expr->symtree->n.sym->result->ts;
2770 /************* Subroutine resolution *************/
2773 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2779 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2780 sym->name, &c->loc);
2781 else if (gfc_pure (NULL))
2782 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2788 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2792 if (sym->attr.generic)
2794 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2797 c->resolved_sym = s;
2798 pure_subroutine (c, s);
2802 /* TODO: Need to search for elemental references in generic interface. */
2805 if (sym->attr.intrinsic)
2806 return gfc_intrinsic_sub_interface (c, 0);
2813 resolve_generic_s (gfc_code *c)
2818 sym = c->symtree->n.sym;
2822 m = resolve_generic_s0 (c, sym);
2825 else if (m == MATCH_ERROR)
2829 if (sym->ns->parent == NULL)
2831 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2835 if (!generic_sym (sym))
2839 /* Last ditch attempt. See if the reference is to an intrinsic
2840 that possesses a matching interface. 14.1.2.4 */
2841 sym = c->symtree->n.sym;
2843 if (!gfc_is_intrinsic (sym, 1, c->loc))
2845 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2846 sym->name, &c->loc);
2850 m = gfc_intrinsic_sub_interface (c, 0);
2854 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2855 "intrinsic subroutine interface", sym->name, &c->loc);
2861 /* Set the name and binding label of the subroutine symbol in the call
2862 expression represented by 'c' to include the type and kind of the
2863 second parameter. This function is for resolving the appropriate
2864 version of c_f_pointer() and c_f_procpointer(). For example, a
2865 call to c_f_pointer() for a default integer pointer could have a
2866 name of c_f_pointer_i4. If no second arg exists, which is an error
2867 for these two functions, it defaults to the generic symbol's name
2868 and binding label. */
2871 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2872 char *name, char *binding_label)
2874 gfc_expr *arg = NULL;
2878 /* The second arg of c_f_pointer and c_f_procpointer determines
2879 the type and kind for the procedure name. */
2880 arg = c->ext.actual->next->expr;
2884 /* Set up the name to have the given symbol's name,
2885 plus the type and kind. */
2886 /* a derived type is marked with the type letter 'u' */
2887 if (arg->ts.type == BT_DERIVED)
2890 kind = 0; /* set the kind as 0 for now */
2894 type = gfc_type_letter (arg->ts.type);
2895 kind = arg->ts.kind;
2898 if (arg->ts.type == BT_CHARACTER)
2899 /* Kind info for character strings not needed. */
2902 sprintf (name, "%s_%c%d", sym->name, type, kind);
2903 /* Set up the binding label as the given symbol's label plus
2904 the type and kind. */
2905 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2909 /* If the second arg is missing, set the name and label as
2910 was, cause it should at least be found, and the missing
2911 arg error will be caught by compare_parameters(). */
2912 sprintf (name, "%s", sym->name);
2913 sprintf (binding_label, "%s", sym->binding_label);
2920 /* Resolve a generic version of the iso_c_binding procedure given
2921 (sym) to the specific one based on the type and kind of the
2922 argument(s). Currently, this function resolves c_f_pointer() and
2923 c_f_procpointer based on the type and kind of the second argument
2924 (FPTR). Other iso_c_binding procedures aren't specially handled.
2925 Upon successfully exiting, c->resolved_sym will hold the resolved
2926 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2930 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2932 gfc_symbol *new_sym;
2933 /* this is fine, since we know the names won't use the max */
2934 char name[GFC_MAX_SYMBOL_LEN + 1];
2935 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2936 /* default to success; will override if find error */
2937 match m = MATCH_YES;
2939 /* Make sure the actual arguments are in the necessary order (based on the
2940 formal args) before resolving. */
2941 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2943 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2944 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2946 set_name_and_label (c, sym, name, binding_label);
2948 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2950 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2952 /* Make sure we got a third arg if the second arg has non-zero
2953 rank. We must also check that the type and rank are
2954 correct since we short-circuit this check in
2955 gfc_procedure_use() (called above to sort actual args). */
2956 if (c->ext.actual->next->expr->rank != 0)
2958 if(c->ext.actual->next->next == NULL
2959 || c->ext.actual->next->next->expr == NULL)
2962 gfc_error ("Missing SHAPE parameter for call to %s "
2963 "at %L", sym->name, &(c->loc));
2965 else if (c->ext.actual->next->next->expr->ts.type
2967 || c->ext.actual->next->next->expr->rank != 1)
2970 gfc_error ("SHAPE parameter for call to %s at %L must "
2971 "be a rank 1 INTEGER array", sym->name,
2978 if (m != MATCH_ERROR)
2980 /* the 1 means to add the optional arg to formal list */
2981 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2983 /* for error reporting, say it's declared where the original was */
2984 new_sym->declared_at = sym->declared_at;
2989 /* no differences for c_loc or c_funloc */
2993 /* set the resolved symbol */
2994 if (m != MATCH_ERROR)
2995 c->resolved_sym = new_sym;
2997 c->resolved_sym = sym;
3003 /* Resolve a subroutine call known to be specific. */
3006 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3010 if(sym->attr.is_iso_c)
3012 m = gfc_iso_c_sub_interface (c,sym);
3016 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3018 if (sym->attr.dummy)
3020 sym->attr.proc = PROC_DUMMY;
3024 sym->attr.proc = PROC_EXTERNAL;
3028 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3031 if (sym->attr.intrinsic)
3033 m = gfc_intrinsic_sub_interface (c, 1);
3037 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3038 "with an intrinsic", sym->name, &c->loc);
3046 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3048 c->resolved_sym = sym;
3049 pure_subroutine (c, sym);
3056 resolve_specific_s (gfc_code *c)
3061 sym = c->symtree->n.sym;
3065 m = resolve_specific_s0 (c, sym);
3068 if (m == MATCH_ERROR)
3071 if (sym->ns->parent == NULL)
3074 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3080 sym = c->symtree->n.sym;
3081 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3082 sym->name, &c->loc);
3088 /* Resolve a subroutine call not known to be generic nor specific. */
3091 resolve_unknown_s (gfc_code *c)
3095 sym = c->symtree->n.sym;
3097 if (sym->attr.dummy)
3099 sym->attr.proc = PROC_DUMMY;
3103 /* See if we have an intrinsic function reference. */
3105 if (gfc_is_intrinsic (sym, 1, c->loc))
3107 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3112 /* The reference is to an external name. */
3115 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3117 c->resolved_sym = sym;
3119 pure_subroutine (c, sym);
3125 /* Resolve a subroutine call. Although it was tempting to use the same code
3126 for functions, subroutines and functions are stored differently and this
3127 makes things awkward. */
3130 resolve_call (gfc_code *c)
3133 procedure_type ptype = PROC_INTRINSIC;
3134 gfc_symbol *csym, *sym;
3135 bool no_formal_args;
3137 csym = c->symtree ? c->symtree->n.sym : NULL;
3139 if (csym && csym->ts.type != BT_UNKNOWN)
3141 gfc_error ("'%s' at %L has a type, which is not consistent with "
3142 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3146 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3149 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3150 sym = st ? st->n.sym : NULL;
3151 if (sym && csym != sym
3152 && sym->ns == gfc_current_ns
3153 && sym->attr.flavor == FL_PROCEDURE
3154 && sym->attr.contained)
3157 if (csym->attr.generic)
3158 c->symtree->n.sym = sym;
3161 csym = c->symtree->n.sym;
3165 /* If this ia a deferred TBP with an abstract interface
3166 (which may of course be referenced), c->expr1 will be set. */
3167 if (csym && csym->attr.abstract && !c->expr1)
3169 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3170 csym->name, &c->loc);
3174 /* Subroutines without the RECURSIVE attribution are not allowed to
3175 * call themselves. */
3176 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3178 if (csym->attr.entry && csym->ns->entries)
3179 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3180 " subroutine '%s' is not RECURSIVE",
3181 csym->name, &c->loc, csym->ns->entries->sym->name);
3183 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3184 " is not RECURSIVE", csym->name, &c->loc);
3189 /* Switch off assumed size checking and do this again for certain kinds
3190 of procedure, once the procedure itself is resolved. */
3191 need_full_assumed_size++;
3194 ptype = csym->attr.proc;
3196 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3197 if (resolve_actual_arglist (c->ext.actual, ptype,
3198 no_formal_args) == FAILURE)
3201 /* Resume assumed_size checking. */
3202 need_full_assumed_size--;
3204 /* If external, check for usage. */
3205 if (csym && is_external_proc (csym))
3206 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3209 if (c->resolved_sym == NULL)
3211 c->resolved_isym = NULL;
3212 switch (procedure_kind (csym))
3215 t = resolve_generic_s (c);
3218 case PTYPE_SPECIFIC:
3219 t = resolve_specific_s (c);
3223 t = resolve_unknown_s (c);
3227 gfc_internal_error ("resolve_subroutine(): bad function type");
3231 /* Some checks of elemental subroutine actual arguments. */
3232 if (resolve_elemental_actual (NULL, c) == FAILURE)
3235 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3236 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3241 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3242 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3243 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3244 if their shapes do not match. If either op1->shape or op2->shape is
3245 NULL, return SUCCESS. */
3248 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3255 if (op1->shape != NULL && op2->shape != NULL)
3257 for (i = 0; i < op1->rank; i++)
3259 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3261 gfc_error ("Shapes for operands at %L and %L are not conformable",
3262 &op1->where, &op2->where);
3273 /* Resolve an operator expression node. This can involve replacing the
3274 operation with a user defined function call. */
3277 resolve_operator (gfc_expr *e)
3279 gfc_expr *op1, *op2;
3281 bool dual_locus_error;
3284 /* Resolve all subnodes-- give them types. */
3286 switch (e->value.op.op)
3289 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3292 /* Fall through... */
3295 case INTRINSIC_UPLUS:
3296 case INTRINSIC_UMINUS:
3297 case INTRINSIC_PARENTHESES:
3298 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3303 /* Typecheck the new node. */
3305 op1 = e->value.op.op1;
3306 op2 = e->value.op.op2;
3307 dual_locus_error = false;
3309 if ((op1 && op1->expr_type == EXPR_NULL)
3310 || (op2 && op2->expr_type == EXPR_NULL))
3312 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3316 switch (e->value.op.op)
3318 case INTRINSIC_UPLUS:
3319 case INTRINSIC_UMINUS:
3320 if (op1->ts.type == BT_INTEGER
3321 || op1->ts.type == BT_REAL
3322 || op1->ts.type == BT_COMPLEX)
3328 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3329 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3332 case INTRINSIC_PLUS:
3333 case INTRINSIC_MINUS:
3334 case INTRINSIC_TIMES:
3335 case INTRINSIC_DIVIDE:
3336 case INTRINSIC_POWER:
3337 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3339 gfc_type_convert_binary (e, 1);
3344 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3345 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3346 gfc_typename (&op2->ts));
3349 case INTRINSIC_CONCAT:
3350 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3351 && op1->ts.kind == op2->ts.kind)
3353 e->ts.type = BT_CHARACTER;
3354 e->ts.kind = op1->ts.kind;
3359 _("Operands of string concatenation operator at %%L are %s/%s"),
3360 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3366 case INTRINSIC_NEQV:
3367 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3369 e->ts.type = BT_LOGICAL;
3370 e->ts.kind = gfc_kind_max (op1, op2);
3371 if (op1->ts.kind < e->ts.kind)
3372 gfc_convert_type (op1, &e->ts, 2);
3373 else if (op2->ts.kind < e->ts.kind)
3374 gfc_convert_type (op2, &e->ts, 2);
3378 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3379 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3380 gfc_typename (&op2->ts));
3385 if (op1->ts.type == BT_LOGICAL)
3387 e->ts.type = BT_LOGICAL;
3388 e->ts.kind = op1->ts.kind;
3392 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3393 gfc_typename (&op1->ts));
3397 case INTRINSIC_GT_OS:
3399 case INTRINSIC_GE_OS:
3401 case INTRINSIC_LT_OS:
3403 case INTRINSIC_LE_OS:
3404 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3406 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3410 /* Fall through... */
3413 case INTRINSIC_EQ_OS:
3415 case INTRINSIC_NE_OS:
3416 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3417 && op1->ts.kind == op2->ts.kind)
3419 e->ts.type = BT_LOGICAL;
3420 e->ts.kind = gfc_default_logical_kind;
3424 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3426 gfc_type_convert_binary (e, 1);
3428 e->ts.type = BT_LOGICAL;
3429 e->ts.kind = gfc_default_logical_kind;
3433 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3435 _("Logicals at %%L must be compared with %s instead of %s"),
3436 (e->value.op.op == INTRINSIC_EQ
3437 || e->value.op.op == INTRINSIC_EQ_OS)
3438 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3441 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3442 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3443 gfc_typename (&op2->ts));
3447 case INTRINSIC_USER:
3448 if (e->value.op.uop->op == NULL)
3449 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3450 else if (op2 == NULL)
3451 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3452 e->value.op.uop->name, gfc_typename (&op1->ts));
3454 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3455 e->value.op.uop->name, gfc_typename (&op1->ts),
3456 gfc_typename (&op2->ts));
3460 case INTRINSIC_PARENTHESES:
3462 if (e->ts.type == BT_CHARACTER)
3463 e->ts.u.cl = op1->ts.u.cl;
3467 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3470 /* Deal with arrayness of an operand through an operator. */
3474 switch (e->value.op.op)
3476 case INTRINSIC_PLUS:
3477 case INTRINSIC_MINUS:
3478 case INTRINSIC_TIMES:
3479 case INTRINSIC_DIVIDE:
3480 case INTRINSIC_POWER:
3481 case INTRINSIC_CONCAT:
3485 case INTRINSIC_NEQV:
3487 case INTRINSIC_EQ_OS:
3489 case INTRINSIC_NE_OS:
3491 case INTRINSIC_GT_OS:
3493 case INTRINSIC_GE_OS:
3495 case INTRINSIC_LT_OS:
3497 case INTRINSIC_LE_OS:
3499 if (op1->rank == 0 && op2->rank == 0)
3502 if (op1->rank == 0 && op2->rank != 0)
3504 e->rank = op2->rank;
3506 if (e->shape == NULL)
3507 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3510 if (op1->rank != 0 && op2->rank == 0)
3512 e->rank = op1->rank;
3514 if (e->shape == NULL)
3515 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3518 if (op1->rank != 0 && op2->rank != 0)
3520 if (op1->rank == op2->rank)
3522 e->rank = op1->rank;
3523 if (e->shape == NULL)
3525 t = compare_shapes(op1, op2);
3529 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3534 /* Allow higher level expressions to work. */
3537 /* Try user-defined operators, and otherwise throw an error. */
3538 dual_locus_error = true;
3540 _("Inconsistent ranks for operator at %%L and %%L"));
3547 case INTRINSIC_PARENTHESES:
3549 case INTRINSIC_UPLUS:
3550 case INTRINSIC_UMINUS:
3551 /* Simply copy arrayness attribute */
3552 e->rank = op1->rank;
3554 if (e->shape == NULL)
3555 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3563 /* Attempt to simplify the expression. */
3566 t = gfc_simplify_expr (e, 0);
3567 /* Some calls do not succeed in simplification and return FAILURE
3568 even though there is no error; e.g. variable references to
3569 PARAMETER arrays. */
3570 if (!gfc_is_constant_expr (e))
3579 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3586 if (dual_locus_error)
3587 gfc_error (msg, &op1->where, &op2->where);
3589 gfc_error (msg, &e->where);
3595 /************** Array resolution subroutines **************/
3598 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3601 /* Compare two integer expressions. */
3604 compare_bound (gfc_expr *a, gfc_expr *b)
3608 if (a == NULL || a->expr_type != EXPR_CONSTANT
3609 || b == NULL || b->expr_type != EXPR_CONSTANT)
3612 /* If either of the types isn't INTEGER, we must have
3613 raised an error earlier. */
3615 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3618 i = mpz_cmp (a->value.integer, b->value.integer);
3628 /* Compare an integer expression with an integer. */
3631 compare_bound_int (gfc_expr *a, int b)
3635 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3638 if (a->ts.type != BT_INTEGER)
3639 gfc_internal_error ("compare_bound_int(): Bad expression");
3641 i = mpz_cmp_si (a->value.integer, b);
3651 /* Compare an integer expression with a mpz_t. */
3654 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3658 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3661 if (a->ts.type != BT_INTEGER)
3662 gfc_internal_error ("compare_bound_int(): Bad expression");
3664 i = mpz_cmp (a->value.integer, b);
3674 /* Compute the last value of a sequence given by a triplet.
3675 Return 0 if it wasn't able to compute the last value, or if the
3676 sequence if empty, and 1 otherwise. */
3679 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3680 gfc_expr *stride, mpz_t last)
3684 if (start == NULL || start->expr_type != EXPR_CONSTANT
3685 || end == NULL || end->expr_type != EXPR_CONSTANT
3686 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3689 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3690 || (stride != NULL && stride->ts.type != BT_INTEGER))
3693 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3695 if (compare_bound (start, end) == CMP_GT)
3697 mpz_set (last, end->value.integer);
3701 if (compare_bound_int (stride, 0) == CMP_GT)
3703 /* Stride is positive */
3704 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3709 /* Stride is negative */
3710 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3715 mpz_sub (rem, end->value.integer, start->value.integer);
3716 mpz_tdiv_r (rem, rem, stride->value.integer);
3717 mpz_sub (last, end->value.integer, rem);
3724 /* Compare a single dimension of an array reference to the array
3728 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3732 /* Given start, end and stride values, calculate the minimum and
3733 maximum referenced indexes. */
3735 switch (ar->dimen_type[i])
3741 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3743 gfc_warning ("Array reference at %L is out of bounds "
3744 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3745 mpz_get_si (ar->start[i]->value.integer),
3746 mpz_get_si (as->lower[i]->value.integer), i+1);
3749 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3751 gfc_warning ("Array reference at %L is out of bounds "
3752 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3753 mpz_get_si (ar->start[i]->value.integer),
3754 mpz_get_si (as->upper[i]->value.integer), i+1);
3762 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3763 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3765 comparison comp_start_end = compare_bound (AR_START, AR_END);
3767 /* Check for zero stride, which is not allowed. */
3768 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3770 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3774 /* if start == len || (stride > 0 && start < len)
3775 || (stride < 0 && start > len),
3776 then the array section contains at least one element. In this
3777 case, there is an out-of-bounds access if
3778 (start < lower || start > upper). */
3779 if (compare_bound (AR_START, AR_END) == CMP_EQ
3780 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3781 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3782 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3783 && comp_start_end == CMP_GT))
3785 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3787 gfc_warning ("Lower array reference at %L is out of bounds "
3788 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3789 mpz_get_si (AR_START->value.integer),
3790 mpz_get_si (as->lower[i]->value.integer), i+1);
3793 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3795 gfc_warning ("Lower array reference at %L is out of bounds "
3796 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3797 mpz_get_si (AR_START->value.integer),
3798 mpz_get_si (as->upper[i]->value.integer), i+1);
3803 /* If we can compute the highest index of the array section,
3804 then it also has to be between lower and upper. */
3805 mpz_init (last_value);
3806 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3809 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3811 gfc_warning ("Upper array reference at %L is out of bounds "
3812 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3813 mpz_get_si (last_value),
3814 mpz_get_si (as->lower[i]->value.integer), i+1);
3815 mpz_clear (last_value);
3818 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3820 gfc_warning ("Upper array reference at %L is out of bounds "
3821 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3822 mpz_get_si (last_value),
3823 mpz_get_si (as->upper[i]->value.integer), i+1);
3824 mpz_clear (last_value);
3828 mpz_clear (last_value);
3836 gfc_internal_error ("check_dimension(): Bad array reference");
3843 /* Compare an array reference with an array specification. */
3846 compare_spec_to_ref (gfc_array_ref *ar)
3853 /* TODO: Full array sections are only allowed as actual parameters. */
3854 if (as->type == AS_ASSUMED_SIZE
3855 && (/*ar->type == AR_FULL
3856 ||*/ (ar->type == AR_SECTION
3857 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3859 gfc_error ("Rightmost upper bound of assumed size array section "
3860 "not specified at %L", &ar->where);
3864 if (ar->type == AR_FULL)
3867 if (as->rank != ar->dimen)
3869 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3870 &ar->where, ar->dimen, as->rank);
3874 for (i = 0; i < as->rank; i++)
3875 if (check_dimension (i, ar, as) == FAILURE)
3882 /* Resolve one part of an array index. */
3885 gfc_resolve_index (gfc_expr *index, int check_scalar)
3892 if (gfc_resolve_expr (index) == FAILURE)
3895 if (check_scalar && index->rank != 0)
3897 gfc_error ("Array index at %L must be scalar", &index->where);
3901 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3903 gfc_error ("Array index at %L must be of INTEGER type, found %s",
3904 &index->where, gfc_basic_typename (index->ts.type));
3908 if (index->ts.type == BT_REAL)
3909 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3910 &index->where) == FAILURE)
3913 if (index->ts.kind != gfc_index_integer_kind
3914 || index->ts.type != BT_INTEGER)
3917 ts.type = BT_INTEGER;
3918 ts.kind = gfc_index_integer_kind;
3920 gfc_convert_type_warn (index, &ts, 2, 0);
3926 /* Resolve a dim argument to an intrinsic function. */
3929 gfc_resolve_dim_arg (gfc_expr *dim)
3934 if (gfc_resolve_expr (dim) == FAILURE)
3939 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3944 if (dim->ts.type != BT_INTEGER)
3946 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3950 if (dim->ts.kind != gfc_index_integer_kind)
3954 ts.type = BT_INTEGER;
3955 ts.kind = gfc_index_integer_kind;
3957 gfc_convert_type_warn (dim, &ts, 2, 0);
3963 /* Given an expression that contains array references, update those array
3964 references to point to the right array specifications. While this is
3965 filled in during matching, this information is difficult to save and load
3966 in a module, so we take care of it here.
3968 The idea here is that the original array reference comes from the
3969 base symbol. We traverse the list of reference structures, setting
3970 the stored reference to references. Component references can
3971 provide an additional array specification. */
3974 find_array_spec (gfc_expr *e)
3978 gfc_symbol *derived;
3981 if (e->symtree->n.sym->ts.type == BT_CLASS)
3982 as = e->symtree->n.sym->ts.u.derived->components->as;
3984 as = e->symtree->n.sym->as;
3987 for (ref = e->ref; ref; ref = ref->next)
3992 gfc_internal_error ("find_array_spec(): Missing spec");
3999 if (derived == NULL)
4000 derived = e->symtree->n.sym->ts.u.derived;
4002 c = derived->components;
4004 for (; c; c = c->next)
4005 if (c == ref->u.c.component)
4007 /* Track the sequence of component references. */
4008 if (c->ts.type == BT_DERIVED)
4009 derived = c->ts.u.derived;
4014 gfc_internal_error ("find_array_spec(): Component not found");
4016 if (c->attr.dimension)
4019 gfc_internal_error ("find_array_spec(): unused as(1)");
4030 gfc_internal_error ("find_array_spec(): unused as(2)");
4034 /* Resolve an array reference. */
4037 resolve_array_ref (gfc_array_ref *ar)
4039 int i, check_scalar;
4042 for (i = 0; i < ar->dimen; i++)
4044 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4046 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
4048 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4050 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4055 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4059 ar->dimen_type[i] = DIMEN_ELEMENT;
4063 ar->dimen_type[i] = DIMEN_VECTOR;
4064 if (e->expr_type == EXPR_VARIABLE
4065 && e->symtree->n.sym->ts.type == BT_DERIVED)
4066 ar->start[i] = gfc_get_parentheses (e);
4070 gfc_error ("Array index at %L is an array of rank %d",
4071 &ar->c_where[i], e->rank);
4076 /* If the reference type is unknown, figure out what kind it is. */
4078 if (ar->type == AR_UNKNOWN)
4080 ar->type = AR_ELEMENT;
4081 for (i = 0; i < ar->dimen; i++)
4082 if (ar->dimen_type[i] == DIMEN_RANGE
4083 || ar->dimen_type[i] == DIMEN_VECTOR)
4085 ar->type = AR_SECTION;
4090 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4098 resolve_substring (gfc_ref *ref)
4100 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4102 if (ref->u.ss.start != NULL)
4104 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4107 if (ref->u.ss.start->ts.type != BT_INTEGER)
4109 gfc_error ("Substring start index at %L must be of type INTEGER",
4110 &ref->u.ss.start->where);
4114 if (ref->u.ss.start->rank != 0)
4116 gfc_error ("Substring start index at %L must be scalar",
4117 &ref->u.ss.start->where);
4121 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4122 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4123 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4125 gfc_error ("Substring start index at %L is less than one",
4126 &ref->u.ss.start->where);
4131 if (ref->u.ss.end != NULL)
4133 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4136 if (ref->u.ss.end->ts.type != BT_INTEGER)
4138 gfc_error ("Substring end index at %L must be of type INTEGER",
4139 &ref->u.ss.end->where);
4143 if (ref->u.ss.end->rank != 0)
4145 gfc_error ("Substring end index at %L must be scalar",
4146 &ref->u.ss.end->where);
4150 if (ref->u.ss.length != NULL
4151 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4152 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4153 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4155 gfc_error ("Substring end index at %L exceeds the string length",
4156 &ref->u.ss.start->where);
4160 if (compare_bound_mpz_t (ref->u.ss.end,
4161 gfc_integer_kinds[k].huge) == CMP_GT
4162 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4163 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4165 gfc_error ("Substring end index at %L is too large",
4166 &ref->u.ss.end->where);
4175 /* This function supplies missing substring charlens. */
4178 gfc_resolve_substring_charlen (gfc_expr *e)
4181 gfc_expr *start, *end;
4183 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4184 if (char_ref->type == REF_SUBSTRING)
4190 gcc_assert (char_ref->next == NULL);
4194 if (e->ts.u.cl->length)
4195 gfc_free_expr (e->ts.u.cl->length);
4196 else if (e->expr_type == EXPR_VARIABLE
4197 && e->symtree->n.sym->attr.dummy)
4201 e->ts.type = BT_CHARACTER;
4202 e->ts.kind = gfc_default_character_kind;
4205 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4207 if (char_ref->u.ss.start)
4208 start = gfc_copy_expr (char_ref->u.ss.start);
4210 start = gfc_int_expr (1);
4212 if (char_ref->u.ss.end)
4213 end = gfc_copy_expr (char_ref->u.ss.end);
4214 else if (e->expr_type == EXPR_VARIABLE)
4215 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4222 /* Length = (end - start +1). */
4223 e->ts.u.cl->length = gfc_subtract (end, start);
4224 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length, gfc_int_expr (1));
4226 e->ts.u.cl->length->ts.type = BT_INTEGER;
4227 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4229 /* Make sure that the length is simplified. */
4230 gfc_simplify_expr (e->ts.u.cl->length, 1);
4231 gfc_resolve_expr (e->ts.u.cl->length);
4235 /* Resolve subtype references. */
4238 resolve_ref (gfc_expr *expr)
4240 int current_part_dimension, n_components, seen_part_dimension;
4243 for (ref = expr->ref; ref; ref = ref->next)
4244 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4246 find_array_spec (expr);
4250 for (ref = expr->ref; ref; ref = ref->next)
4254 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4262 resolve_substring (ref);
4266 /* Check constraints on part references. */
4268 current_part_dimension = 0;
4269 seen_part_dimension = 0;
4272 for (ref = expr->ref; ref; ref = ref->next)
4277 switch (ref->u.ar.type)
4281 current_part_dimension = 1;
4285 current_part_dimension = 0;
4289 gfc_internal_error ("resolve_ref(): Bad array reference");
4295 if (current_part_dimension || seen_part_dimension)
4298 if (ref->u.c.component->attr.pointer
4299 || ref->u.c.component->attr.proc_pointer)
4301 gfc_error ("Component to the right of a part reference "
4302 "with nonzero rank must not have the POINTER "
4303 "attribute at %L", &expr->where);
4306 else if (ref->u.c.component->attr.allocatable)
4308 gfc_error ("Component to the right of a part reference "
4309 "with nonzero rank must not have the ALLOCATABLE "
4310 "attribute at %L", &expr->where);
4322 if (((ref->type == REF_COMPONENT && n_components > 1)
4323 || ref->next == NULL)
4324 && current_part_dimension
4325 && seen_part_dimension)
4327 gfc_error ("Two or more part references with nonzero rank must "
4328 "not be specified at %L", &expr->where);
4332 if (ref->type == REF_COMPONENT)
4334 if (current_part_dimension)
4335 seen_part_dimension = 1;
4337 /* reset to make sure */
4338 current_part_dimension = 0;
4346 /* Given an expression, determine its shape. This is easier than it sounds.
4347 Leaves the shape array NULL if it is not possible to determine the shape. */
4350 expression_shape (gfc_expr *e)
4352 mpz_t array[GFC_MAX_DIMENSIONS];
4355 if (e->rank == 0 || e->shape != NULL)
4358 for (i = 0; i < e->rank; i++)
4359 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4362 e->shape = gfc_get_shape (e->rank);
4364 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4369 for (i--; i >= 0; i--)
4370 mpz_clear (array[i]);
4374 /* Given a variable expression node, compute the rank of the expression by
4375 examining the base symbol and any reference structures it may have. */
4378 expression_rank (gfc_expr *e)
4383 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4384 could lead to serious confusion... */
4385 gcc_assert (e->expr_type != EXPR_COMPCALL);
4389 if (e->expr_type == EXPR_ARRAY)
4391 /* Constructors can have a rank different from one via RESHAPE(). */
4393 if (e->symtree == NULL)
4399 e->rank = (e->symtree->n.sym->as == NULL)
4400 ? 0 : e->symtree->n.sym->as->rank;
4406 for (ref = e->ref; ref; ref = ref->next)
4408 if (ref->type != REF_ARRAY)
4411 if (ref->u.ar.type == AR_FULL)
4413 rank = ref->u.ar.as->rank;
4417 if (ref->u.ar.type == AR_SECTION)
4419 /* Figure out the rank of the section. */
4421 gfc_internal_error ("expression_rank(): Two array specs");
4423 for (i = 0; i < ref->u.ar.dimen; i++)
4424 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4425 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4435 expression_shape (e);
4439 /* Resolve a variable expression. */
4442 resolve_variable (gfc_expr *e)
4449 if (e->symtree == NULL)
4452 if (e->ref && resolve_ref (e) == FAILURE)
4455 sym = e->symtree->n.sym;
4456 if (sym->attr.flavor == FL_PROCEDURE
4457 && (!sym->attr.function
4458 || (sym->attr.function && sym->result
4459 && sym->result->attr.proc_pointer
4460 && !sym->result->attr.function)))
4462 e->ts.type = BT_PROCEDURE;
4463 goto resolve_procedure;
4466 if (sym->ts.type != BT_UNKNOWN)
4467 gfc_variable_attr (e, &e->ts);
4470 /* Must be a simple variable reference. */
4471 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4476 if (check_assumed_size_reference (sym, e))
4479 /* Deal with forward references to entries during resolve_code, to
4480 satisfy, at least partially, 12.5.2.5. */
4481 if (gfc_current_ns->entries
4482 && current_entry_id == sym->entry_id
4485 && cs_base->current->op != EXEC_ENTRY)
4487 gfc_entry_list *entry;
4488 gfc_formal_arglist *formal;
4492 /* If the symbol is a dummy... */
4493 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4495 entry = gfc_current_ns->entries;
4498 /* ...test if the symbol is a parameter of previous entries. */
4499 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4500 for (formal = entry->sym->formal; formal; formal = formal->next)
4502 if (formal->sym && sym->name == formal->sym->name)
4506 /* If it has not been seen as a dummy, this is an error. */
4509 if (specification_expr)
4510 gfc_error ("Variable '%s', used in a specification expression"
4511 ", is referenced at %L before the ENTRY statement "
4512 "in which it is a parameter",
4513 sym->name, &cs_base->current->loc);
4515 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4516 "statement in which it is a parameter",
4517 sym->name, &cs_base->current->loc);
4522 /* Now do the same check on the specification expressions. */
4523 specification_expr = 1;
4524 if (sym->ts.type == BT_CHARACTER
4525 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4529 for (n = 0; n < sym->as->rank; n++)
4531 specification_expr = 1;
4532 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4534 specification_expr = 1;
4535 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4538 specification_expr = 0;
4541 /* Update the symbol's entry level. */
4542 sym->entry_id = current_entry_id + 1;
4546 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4553 /* Checks to see that the correct symbol has been host associated.
4554 The only situation where this arises is that in which a twice
4555 contained function is parsed after the host association is made.
4556 Therefore, on detecting this, change the symbol in the expression
4557 and convert the array reference into an actual arglist if the old
4558 symbol is a variable. */
4560 check_host_association (gfc_expr *e)
4562 gfc_symbol *sym, *old_sym;
4566 gfc_actual_arglist *arg, *tail = NULL;
4567 bool retval = e->expr_type == EXPR_FUNCTION;
4569 /* If the expression is the result of substitution in
4570 interface.c(gfc_extend_expr) because there is no way in
4571 which the host association can be wrong. */
4572 if (e->symtree == NULL
4573 || e->symtree->n.sym == NULL
4574 || e->user_operator)
4577 old_sym = e->symtree->n.sym;
4579 if (gfc_current_ns->parent
4580 && old_sym->ns != gfc_current_ns)
4582 /* Use the 'USE' name so that renamed module symbols are
4583 correctly handled. */
4584 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4586 if (sym && old_sym != sym
4587 && sym->ts.type == old_sym->ts.type
4588 && sym->attr.flavor == FL_PROCEDURE
4589 && sym->attr.contained)
4591 /* Clear the shape, since it might not be valid. */
4592 if (e->shape != NULL)
4594 for (n = 0; n < e->rank; n++)
4595 mpz_clear (e->shape[n]);
4597 gfc_free (e->shape);
4600 /* Give the expression the right symtree! */
4601 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4602 gcc_assert (st != NULL);
4604 if (old_sym->attr.flavor == FL_PROCEDURE
4605 || e->expr_type == EXPR_FUNCTION)
4607 /* Original was function so point to the new symbol, since
4608 the actual argument list is already attached to the
4610 e->value.function.esym = NULL;
4615 /* Original was variable so convert array references into
4616 an actual arglist. This does not need any checking now
4617 since gfc_resolve_function will take care of it. */
4618 e->value.function.actual = NULL;
4619 e->expr_type = EXPR_FUNCTION;
4622 /* Ambiguity will not arise if the array reference is not
4623 the last reference. */
4624 for (ref = e->ref; ref; ref = ref->next)
4625 if (ref->type == REF_ARRAY && ref->next == NULL)
4628 gcc_assert (ref->type == REF_ARRAY);
4630 /* Grab the start expressions from the array ref and
4631 copy them into actual arguments. */
4632 for (n = 0; n < ref->u.ar.dimen; n++)
4634 arg = gfc_get_actual_arglist ();
4635 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4636 if (e->value.function.actual == NULL)
4637 tail = e->value.function.actual = arg;
4645 /* Dump the reference list and set the rank. */
4646 gfc_free_ref_list (e->ref);
4648 e->rank = sym->as ? sym->as->rank : 0;
4651 gfc_resolve_expr (e);
4655 /* This might have changed! */
4656 return e->expr_type == EXPR_FUNCTION;
4661 gfc_resolve_character_operator (gfc_expr *e)
4663 gfc_expr *op1 = e->value.op.op1;
4664 gfc_expr *op2 = e->value.op.op2;
4665 gfc_expr *e1 = NULL;
4666 gfc_expr *e2 = NULL;
4668 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4670 if (op1->ts.u.cl && op1->ts.u.cl->length)
4671 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4672 else if (op1->expr_type == EXPR_CONSTANT)
4673 e1 = gfc_int_expr (op1->value.character.length);
4675 if (op2->ts.u.cl && op2->ts.u.cl->length)
4676 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4677 else if (op2->expr_type == EXPR_CONSTANT)
4678 e2 = gfc_int_expr (op2->value.character.length);
4680 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4685 e->ts.u.cl->length = gfc_add (e1, e2);
4686 e->ts.u.cl->length->ts.type = BT_INTEGER;
4687 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4688 gfc_simplify_expr (e->ts.u.cl->length, 0);
4689 gfc_resolve_expr (e->ts.u.cl->length);
4695 /* Ensure that an character expression has a charlen and, if possible, a
4696 length expression. */
4699 fixup_charlen (gfc_expr *e)
4701 /* The cases fall through so that changes in expression type and the need
4702 for multiple fixes are picked up. In all circumstances, a charlen should
4703 be available for the middle end to hang a backend_decl on. */
4704 switch (e->expr_type)
4707 gfc_resolve_character_operator (e);
4710 if (e->expr_type == EXPR_ARRAY)
4711 gfc_resolve_character_array_constructor (e);
4713 case EXPR_SUBSTRING:
4714 if (!e->ts.u.cl && e->ref)
4715 gfc_resolve_substring_charlen (e);
4719 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4726 /* Update an actual argument to include the passed-object for type-bound
4727 procedures at the right position. */
4729 static gfc_actual_arglist*
4730 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4733 gcc_assert (argpos > 0);
4737 gfc_actual_arglist* result;
4739 result = gfc_get_actual_arglist ();
4743 result->name = name;
4749 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4751 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4756 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4759 extract_compcall_passed_object (gfc_expr* e)
4763 gcc_assert (e->expr_type == EXPR_COMPCALL);
4765 if (e->value.compcall.base_object)
4766 po = gfc_copy_expr (e->value.compcall.base_object);
4769 po = gfc_get_expr ();
4770 po->expr_type = EXPR_VARIABLE;
4771 po->symtree = e->symtree;
4772 po->ref = gfc_copy_ref (e->ref);
4775 if (gfc_resolve_expr (po) == FAILURE)
4782 /* Update the arglist of an EXPR_COMPCALL expression to include the
4786 update_compcall_arglist (gfc_expr* e)
4789 gfc_typebound_proc* tbp;
4791 tbp = e->value.compcall.tbp;
4796 po = extract_compcall_passed_object (e);
4800 if (tbp->nopass || e->value.compcall.ignore_pass)
4806 gcc_assert (tbp->pass_arg_num > 0);
4807 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4815 /* Extract the passed object from a PPC call (a copy of it). */
4818 extract_ppc_passed_object (gfc_expr *e)
4823 po = gfc_get_expr ();
4824 po->expr_type = EXPR_VARIABLE;
4825 po->symtree = e->symtree;
4826 po->ref = gfc_copy_ref (e->ref);
4828 /* Remove PPC reference. */
4830 while ((*ref)->next)
4831 (*ref) = (*ref)->next;
4832 gfc_free_ref_list (*ref);
4835 if (gfc_resolve_expr (po) == FAILURE)
4842 /* Update the actual arglist of a procedure pointer component to include the
4846 update_ppc_arglist (gfc_expr* e)
4850 gfc_typebound_proc* tb;
4852 if (!gfc_is_proc_ptr_comp (e, &ppc))
4859 else if (tb->nopass)
4862 po = extract_ppc_passed_object (e);
4868 gfc_error ("Passed-object at %L must be scalar", &e->where);
4872 gcc_assert (tb->pass_arg_num > 0);
4873 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
4881 /* Check that the object a TBP is called on is valid, i.e. it must not be
4882 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
4885 check_typebound_baseobject (gfc_expr* e)
4889 base = extract_compcall_passed_object (e);
4893 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
4895 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
4897 gfc_error ("Base object for type-bound procedure call at %L is of"
4898 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
4902 /* If the procedure called is NOPASS, the base object must be scalar. */
4903 if (e->value.compcall.tbp->nopass && base->rank > 0)
4905 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
4906 " be scalar", &e->where);
4910 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
4913 gfc_error ("Non-scalar base object at %L currently not implemented",
4922 /* Resolve a call to a type-bound procedure, either function or subroutine,
4923 statically from the data in an EXPR_COMPCALL expression. The adapted
4924 arglist and the target-procedure symtree are returned. */
4927 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
4928 gfc_actual_arglist** actual)
4930 gcc_assert (e->expr_type == EXPR_COMPCALL);
4931 gcc_assert (!e->value.compcall.tbp->is_generic);
4933 /* Update the actual arglist for PASS. */
4934 if (update_compcall_arglist (e) == FAILURE)
4937 *actual = e->value.compcall.actual;
4938 *target = e->value.compcall.tbp->u.specific;
4940 gfc_free_ref_list (e->ref);
4942 e->value.compcall.actual = NULL;
4948 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
4949 which of the specific bindings (if any) matches the arglist and transform
4950 the expression into a call of that binding. */
4953 resolve_typebound_generic_call (gfc_expr* e)
4955 gfc_typebound_proc* genproc;
4956 const char* genname;
4958 gcc_assert (e->expr_type == EXPR_COMPCALL);
4959 genname = e->value.compcall.name;
4960 genproc = e->value.compcall.tbp;
4962 if (!genproc->is_generic)
4965 /* Try the bindings on this type and in the inheritance hierarchy. */
4966 for (; genproc; genproc = genproc->overridden)
4970 gcc_assert (genproc->is_generic);
4971 for (g = genproc->u.generic; g; g = g->next)
4974 gfc_actual_arglist* args;
4977 gcc_assert (g->specific);
4979 if (g->specific->error)
4982 target = g->specific->u.specific->n.sym;
4984 /* Get the right arglist by handling PASS/NOPASS. */
4985 args = gfc_copy_actual_arglist (e->value.compcall.actual);
4986 if (!g->specific->nopass)
4989 po = extract_compcall_passed_object (e);
4993 gcc_assert (g->specific->pass_arg_num > 0);
4994 gcc_assert (!g->specific->error);
4995 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
4996 g->specific->pass_arg);
4998 resolve_actual_arglist (args, target->attr.proc,
4999 is_external_proc (target) && !target->formal);
5001 /* Check if this arglist matches the formal. */
5002 matches = gfc_arglist_matches_symbol (&args, target);
5004 /* Clean up and break out of the loop if we've found it. */
5005 gfc_free_actual_arglist (args);
5008 e->value.compcall.tbp = g->specific;
5014 /* Nothing matching found! */
5015 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5016 " '%s' at %L", genname, &e->where);
5024 /* Resolve a call to a type-bound subroutine. */
5027 resolve_typebound_call (gfc_code* c)
5029 gfc_actual_arglist* newactual;
5030 gfc_symtree* target;
5032 /* Check that's really a SUBROUTINE. */
5033 if (!c->expr1->value.compcall.tbp->subroutine)
5035 gfc_error ("'%s' at %L should be a SUBROUTINE",
5036 c->expr1->value.compcall.name, &c->loc);
5040 if (check_typebound_baseobject (c->expr1) == FAILURE)
5043 if (resolve_typebound_generic_call (c->expr1) == FAILURE)
5046 /* Transform into an ordinary EXEC_CALL for now. */
5048 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5051 c->ext.actual = newactual;
5052 c->symtree = target;
5053 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5055 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5057 gfc_free_expr (c->expr1);
5058 c->expr1 = gfc_get_expr ();
5059 c->expr1->expr_type = EXPR_FUNCTION;
5060 c->expr1->symtree = target;
5061 c->expr1->where = c->loc;
5063 return resolve_call (c);
5067 /* Resolve a component-call expression. This originally was intended
5068 only to see functions. However, it is convenient to use it in
5069 resolving subroutine class methods, since we do not have to add a
5070 gfc_code each time. */
5072 resolve_compcall (gfc_expr* e, bool fcn)
5074 gfc_actual_arglist* newactual;
5075 gfc_symtree* target;
5077 /* Check that's really a FUNCTION. */
5078 if (fcn && !e->value.compcall.tbp->function)
5080 gfc_error ("'%s' at %L should be a FUNCTION",
5081 e->value.compcall.name, &e->where);
5084 else if (!fcn && !e->value.compcall.tbp->subroutine)
5086 /* To resolve class member calls, we borrow this bit
5087 of code to select the specific procedures. */
5088 gfc_error ("'%s' at %L should be a SUBROUTINE",
5089 e->value.compcall.name, &e->where);
5093 /* These must not be assign-calls! */
5094 gcc_assert (!e->value.compcall.assign);
5096 if (check_typebound_baseobject (e) == FAILURE)
5099 if (resolve_typebound_generic_call (e) == FAILURE)
5101 gcc_assert (!e->value.compcall.tbp->is_generic);
5103 /* Take the rank from the function's symbol. */
5104 if (e->value.compcall.tbp->u.specific->n.sym->as)
5105 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5107 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5108 arglist to the TBP's binding target. */
5110 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5113 e->value.function.actual = newactual;
5114 e->value.function.name = e->value.compcall.name;
5115 e->value.function.esym = target->n.sym;
5116 e->value.function.class_esym = NULL;
5117 e->value.function.isym = NULL;
5118 e->symtree = target;
5119 e->ts = target->n.sym->ts;
5120 e->expr_type = EXPR_FUNCTION;
5122 /* Resolution is not necessary if this is a class subroutine; this
5123 function only has to identify the specific proc. Resolution of
5124 the call will be done next in resolve_typebound_call. */
5125 return fcn ? gfc_resolve_expr (e) : SUCCESS;
5129 /* Resolve a typebound call for the members in a class. This group of
5130 functions implements dynamic dispatch in the provisional version
5131 of f03 OOP. As soon as vtables are in place and contain pointers
5132 to methods, this will no longer be necessary. */
5133 static gfc_expr *list_e;
5134 static void check_class_members (gfc_symbol *);
5135 static gfc_try class_try;
5136 static bool fcn_flag;
5137 static gfc_symbol *class_object;
5141 check_members (gfc_symbol *derived)
5143 if (derived->attr.flavor == FL_DERIVED)
5144 check_class_members (derived);
5149 check_class_members (gfc_symbol *derived)
5153 gfc_class_esym_list *etmp;
5155 e = gfc_copy_expr (list_e);
5157 tbp = gfc_find_typebound_proc (derived, &class_try,
5158 e->value.compcall.name,
5163 gfc_error ("no typebound available procedure named '%s' at %L",
5164 e->value.compcall.name, &e->where);
5168 if (tbp->n.tb->is_generic)
5170 /* If we have to match a passed class member, force the actual
5171 expression to have the correct type. */
5172 if (!tbp->n.tb->nopass)
5174 if (e->value.compcall.base_object == NULL)
5175 e->value.compcall.base_object =
5176 extract_compcall_passed_object (e);
5178 e->value.compcall.base_object->ts.type = BT_DERIVED;
5179 e->value.compcall.base_object->ts.u.derived = derived;
5183 e->value.compcall.tbp = tbp->n.tb;
5184 e->value.compcall.name = tbp->name;
5186 /* Let the original expresssion catch the assertion in
5187 resolve_compcall, since this flag does not appear to be reset or
5188 copied in some systems. */
5189 e->value.compcall.assign = 0;
5191 /* Do the renaming, PASSing, generic => specific and other
5192 good things for each class member. */
5193 class_try = (resolve_compcall (e, fcn_flag) == SUCCESS)
5194 ? class_try : FAILURE;
5196 /* Now transfer the found symbol to the esym list. */
5197 if (class_try == SUCCESS)
5199 etmp = list_e->value.function.class_esym;
5200 list_e->value.function.class_esym
5201 = gfc_get_class_esym_list();
5202 list_e->value.function.class_esym->next = etmp;
5203 list_e->value.function.class_esym->derived = derived;
5204 list_e->value.function.class_esym->esym
5205 = e->value.function.esym;
5210 /* Burrow down into grandchildren types. */
5211 if (derived->f2k_derived)
5212 gfc_traverse_ns (derived->f2k_derived, check_members);
5216 /* Eliminate esym_lists where all the members point to the
5217 typebound procedure of the declared type; ie. one where
5218 type selection has no effect.. */
5220 resolve_class_esym (gfc_expr *e)
5222 gfc_class_esym_list *p, *q;
5225 gcc_assert (e && e->expr_type == EXPR_FUNCTION);
5227 p = e->value.function.class_esym;
5231 for (; p; p = p->next)
5232 empty = empty && (e->value.function.esym == p->esym);
5236 p = e->value.function.class_esym;
5242 e->value.function.class_esym = NULL;
5247 /* Generate an expression for the hash value, given the reference to
5248 the class of the final expression (class_ref), the base of the
5249 full reference list (new_ref), the declared type and the class
5252 hash_value_expr (gfc_ref *class_ref, gfc_ref *new_ref, gfc_symtree *st)
5254 gfc_expr *hash_value;
5256 /* Build an expression for the correct hash_value; ie. that of the last
5260 class_ref->next = NULL;
5264 gfc_free_ref_list (new_ref);
5267 hash_value = gfc_get_expr ();
5268 hash_value->expr_type = EXPR_VARIABLE;
5269 hash_value->symtree = st;
5270 hash_value->symtree->n.sym->refs++;
5271 hash_value->ref = new_ref;
5272 gfc_add_component_ref (hash_value, "$vptr");
5273 gfc_add_component_ref (hash_value, "$hash");
5279 /* Get the ultimate declared type from an expression. In addition,
5280 return the last class/derived type reference and the copy of the
5283 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5286 gfc_symbol *declared;
5291 *new_ref = gfc_copy_ref (e->ref);
5292 for (ref = *new_ref; ref; ref = ref->next)
5294 if (ref->type != REF_COMPONENT)
5297 if (ref->u.c.component->ts.type == BT_CLASS
5298 || ref->u.c.component->ts.type == BT_DERIVED)
5300 declared = ref->u.c.component->ts.u.derived;
5305 if (declared == NULL)
5306 declared = e->symtree->n.sym->ts.u.derived;
5312 /* Resolve the argument expressions so that any arguments expressions
5313 that include class methods are resolved before the current call.
5314 This is necessary because of the static variables used in CLASS
5315 method resolution. */
5317 resolve_arg_exprs (gfc_actual_arglist *arg)
5319 /* Resolve the actual arglist expressions. */
5320 for (; arg; arg = arg->next)
5323 gfc_resolve_expr (arg->expr);
5328 /* Resolve a CLASS typebound function, or 'method'. */
5330 resolve_class_compcall (gfc_expr* e)
5332 gfc_symbol *derived, *declared;
5338 class_object = st->n.sym;
5340 /* Get the CLASS declared type. */
5341 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5343 /* Weed out cases of the ultimate component being a derived type. */
5344 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5346 gfc_free_ref_list (new_ref);
5347 return resolve_compcall (e, true);
5350 /* Resolve the argument expressions, */
5351 resolve_arg_exprs (e->value.function.actual);
5353 /* Get the data component, which is of the declared type. */
5354 derived = declared->components->ts.u.derived;
5356 /* Resolve the function call for each member of the class. */
5357 class_try = SUCCESS;
5359 list_e = gfc_copy_expr (e);
5360 check_class_members (derived);
5362 class_try = (resolve_compcall (e, true) == SUCCESS)
5363 ? class_try : FAILURE;
5365 /* Transfer the class list to the original expression. Note that
5366 the class_esym list is cleaned up in trans-expr.c, as the calls
5368 e->value.function.class_esym = list_e->value.function.class_esym;
5369 list_e->value.function.class_esym = NULL;
5370 gfc_free_expr (list_e);
5372 resolve_class_esym (e);
5374 /* More than one typebound procedure so transmit an expression for
5375 the hash_value as the selector. */
5376 if (e->value.function.class_esym != NULL)
5377 e->value.function.class_esym->hash_value
5378 = hash_value_expr (class_ref, new_ref, st);
5383 /* Resolve a CLASS typebound subroutine, or 'method'. */
5385 resolve_class_typebound_call (gfc_code *code)
5387 gfc_symbol *derived, *declared;
5392 st = code->expr1->symtree;
5393 class_object = st->n.sym;
5395 /* Get the CLASS declared type. */
5396 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5398 /* Weed out cases of the ultimate component being a derived type. */
5399 if (class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5401 gfc_free_ref_list (new_ref);
5402 return resolve_typebound_call (code);
5405 /* Resolve the argument expressions, */
5406 resolve_arg_exprs (code->expr1->value.compcall.actual);
5408 /* Get the data component, which is of the declared type. */
5409 derived = declared->components->ts.u.derived;
5411 class_try = SUCCESS;
5413 list_e = gfc_copy_expr (code->expr1);
5414 check_class_members (derived);
5416 class_try = (resolve_typebound_call (code) == SUCCESS)
5417 ? class_try : FAILURE;
5419 /* Transfer the class list to the original expression. Note that
5420 the class_esym list is cleaned up in trans-expr.c, as the calls
5422 code->expr1->value.function.class_esym
5423 = list_e->value.function.class_esym;
5424 list_e->value.function.class_esym = NULL;
5425 gfc_free_expr (list_e);
5427 resolve_class_esym (code->expr1);
5429 /* More than one typebound procedure so transmit an expression for
5430 the hash_value as the selector. */
5431 if (code->expr1->value.function.class_esym != NULL)
5432 code->expr1->value.function.class_esym->hash_value
5433 = hash_value_expr (class_ref, new_ref, st);
5439 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5442 resolve_ppc_call (gfc_code* c)
5444 gfc_component *comp;
5447 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5450 c->resolved_sym = c->expr1->symtree->n.sym;
5451 c->expr1->expr_type = EXPR_VARIABLE;
5453 if (!comp->attr.subroutine)
5454 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5456 if (resolve_ref (c->expr1) == FAILURE)
5459 if (update_ppc_arglist (c->expr1) == FAILURE)
5462 c->ext.actual = c->expr1->value.compcall.actual;
5464 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5465 comp->formal == NULL) == FAILURE)
5468 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5474 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5477 resolve_expr_ppc (gfc_expr* e)
5479 gfc_component *comp;
5482 b = gfc_is_proc_ptr_comp (e, &comp);
5485 /* Convert to EXPR_FUNCTION. */
5486 e->expr_type = EXPR_FUNCTION;
5487 e->value.function.isym = NULL;
5488 e->value.function.actual = e->value.compcall.actual;
5490 if (comp->as != NULL)
5491 e->rank = comp->as->rank;
5493 if (!comp->attr.function)
5494 gfc_add_function (&comp->attr, comp->name, &e->where);
5496 if (resolve_ref (e) == FAILURE)
5499 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5500 comp->formal == NULL) == FAILURE)
5503 if (update_ppc_arglist (e) == FAILURE)
5506 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5512 /* Resolve an expression. That is, make sure that types of operands agree
5513 with their operators, intrinsic operators are converted to function calls
5514 for overloaded types and unresolved function references are resolved. */
5517 gfc_resolve_expr (gfc_expr *e)
5524 switch (e->expr_type)
5527 t = resolve_operator (e);
5533 if (check_host_association (e))
5534 t = resolve_function (e);
5537 t = resolve_variable (e);
5539 expression_rank (e);
5542 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5543 && e->ref->type != REF_SUBSTRING)
5544 gfc_resolve_substring_charlen (e);
5549 if (e->symtree && e->symtree->n.sym->ts.type == BT_CLASS)
5550 t = resolve_class_compcall (e);
5552 t = resolve_compcall (e, true);
5555 case EXPR_SUBSTRING:
5556 t = resolve_ref (e);
5565 t = resolve_expr_ppc (e);
5570 if (resolve_ref (e) == FAILURE)
5573 t = gfc_resolve_array_constructor (e);
5574 /* Also try to expand a constructor. */
5577 expression_rank (e);
5578 gfc_expand_constructor (e);
5581 /* This provides the opportunity for the length of constructors with
5582 character valued function elements to propagate the string length
5583 to the expression. */
5584 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5585 t = gfc_resolve_character_array_constructor (e);
5589 case EXPR_STRUCTURE:
5590 t = resolve_ref (e);
5594 t = resolve_structure_cons (e);
5598 t = gfc_simplify_expr (e, 0);
5602 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5605 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5612 /* Resolve an expression from an iterator. They must be scalar and have
5613 INTEGER or (optionally) REAL type. */
5616 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5617 const char *name_msgid)
5619 if (gfc_resolve_expr (expr) == FAILURE)
5622 if (expr->rank != 0)
5624 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5628 if (expr->ts.type != BT_INTEGER)
5630 if (expr->ts.type == BT_REAL)
5633 return gfc_notify_std (GFC_STD_F95_DEL,
5634 "Deleted feature: %s at %L must be integer",
5635 _(name_msgid), &expr->where);
5638 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5645 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5653 /* Resolve the expressions in an iterator structure. If REAL_OK is
5654 false allow only INTEGER type iterators, otherwise allow REAL types. */
5657 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5659 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5663 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5665 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5670 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5671 "Start expression in DO loop") == FAILURE)
5674 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5675 "End expression in DO loop") == FAILURE)
5678 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5679 "Step expression in DO loop") == FAILURE)
5682 if (iter->step->expr_type == EXPR_CONSTANT)
5684 if ((iter->step->ts.type == BT_INTEGER
5685 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5686 || (iter->step->ts.type == BT_REAL
5687 && mpfr_sgn (iter->step->value.real) == 0))
5689 gfc_error ("Step expression in DO loop at %L cannot be zero",
5690 &iter->step->where);
5695 /* Convert start, end, and step to the same type as var. */
5696 if (iter->start->ts.kind != iter->var->ts.kind
5697 || iter->start->ts.type != iter->var->ts.type)
5698 gfc_convert_type (iter->start, &iter->var->ts, 2);
5700 if (iter->end->ts.kind != iter->var->ts.kind
5701 || iter->end->ts.type != iter->var->ts.type)
5702 gfc_convert_type (iter->end, &iter->var->ts, 2);
5704 if (iter->step->ts.kind != iter->var->ts.kind
5705 || iter->step->ts.type != iter->var->ts.type)
5706 gfc_convert_type (iter->step, &iter->var->ts, 2);
5708 if (iter->start->expr_type == EXPR_CONSTANT
5709 && iter->end->expr_type == EXPR_CONSTANT
5710 && iter->step->expr_type == EXPR_CONSTANT)
5713 if (iter->start->ts.type == BT_INTEGER)
5715 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5716 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5720 sgn = mpfr_sgn (iter->step->value.real);
5721 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5723 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5724 gfc_warning ("DO loop at %L will be executed zero times",
5725 &iter->step->where);
5732 /* Traversal function for find_forall_index. f == 2 signals that
5733 that variable itself is not to be checked - only the references. */
5736 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5738 if (expr->expr_type != EXPR_VARIABLE)
5741 /* A scalar assignment */
5742 if (!expr->ref || *f == 1)
5744 if (expr->symtree->n.sym == sym)
5756 /* Check whether the FORALL index appears in the expression or not.
5757 Returns SUCCESS if SYM is found in EXPR. */
5760 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5762 if (gfc_traverse_expr (expr, sym, forall_index, f))
5769 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5770 to be a scalar INTEGER variable. The subscripts and stride are scalar
5771 INTEGERs, and if stride is a constant it must be nonzero.
5772 Furthermore "A subscript or stride in a forall-triplet-spec shall
5773 not contain a reference to any index-name in the
5774 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5777 resolve_forall_iterators (gfc_forall_iterator *it)
5779 gfc_forall_iterator *iter, *iter2;
5781 for (iter = it; iter; iter = iter->next)
5783 if (gfc_resolve_expr (iter->var) == SUCCESS
5784 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5785 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5788 if (gfc_resolve_expr (iter->start) == SUCCESS
5789 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5790 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5791 &iter->start->where);
5792 if (iter->var->ts.kind != iter->start->ts.kind)
5793 gfc_convert_type (iter->start, &iter->var->ts, 2);
5795 if (gfc_resolve_expr (iter->end) == SUCCESS
5796 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5797 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5799 if (iter->var->ts.kind != iter->end->ts.kind)
5800 gfc_convert_type (iter->end, &iter->var->ts, 2);
5802 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5804 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5805 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5806 &iter->stride->where, "INTEGER");
5808 if (iter->stride->expr_type == EXPR_CONSTANT
5809 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5810 gfc_error ("FORALL stride expression at %L cannot be zero",
5811 &iter->stride->where);
5813 if (iter->var->ts.kind != iter->stride->ts.kind)
5814 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5817 for (iter = it; iter; iter = iter->next)
5818 for (iter2 = iter; iter2; iter2 = iter2->next)
5820 if (find_forall_index (iter2->start,
5821 iter->var->symtree->n.sym, 0) == SUCCESS
5822 || find_forall_index (iter2->end,
5823 iter->var->symtree->n.sym, 0) == SUCCESS
5824 || find_forall_index (iter2->stride,
5825 iter->var->symtree->n.sym, 0) == SUCCESS)
5826 gfc_error ("FORALL index '%s' may not appear in triplet "
5827 "specification at %L", iter->var->symtree->name,
5828 &iter2->start->where);
5833 /* Given a pointer to a symbol that is a derived type, see if it's
5834 inaccessible, i.e. if it's defined in another module and the components are
5835 PRIVATE. The search is recursive if necessary. Returns zero if no
5836 inaccessible components are found, nonzero otherwise. */
5839 derived_inaccessible (gfc_symbol *sym)
5843 if (sym->attr.use_assoc && sym->attr.private_comp)
5846 for (c = sym->components; c; c = c->next)
5848 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
5856 /* Resolve the argument of a deallocate expression. The expression must be
5857 a pointer or a full array. */
5860 resolve_deallocate_expr (gfc_expr *e)
5862 symbol_attribute attr;
5863 int allocatable, pointer, check_intent_in;
5868 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
5869 check_intent_in = 1;
5871 if (gfc_resolve_expr (e) == FAILURE)
5874 if (e->expr_type != EXPR_VARIABLE)
5877 sym = e->symtree->n.sym;
5879 if (sym->ts.type == BT_CLASS)
5881 allocatable = sym->ts.u.derived->components->attr.allocatable;
5882 pointer = sym->ts.u.derived->components->attr.pointer;
5886 allocatable = sym->attr.allocatable;
5887 pointer = sym->attr.pointer;
5889 for (ref = e->ref; ref; ref = ref->next)
5892 check_intent_in = 0;
5897 if (ref->u.ar.type != AR_FULL)
5902 c = ref->u.c.component;
5903 if (c->ts.type == BT_CLASS)
5905 allocatable = c->ts.u.derived->components->attr.allocatable;
5906 pointer = c->ts.u.derived->components->attr.pointer;
5910 allocatable = c->attr.allocatable;
5911 pointer = c->attr.pointer;
5921 attr = gfc_expr_attr (e);
5923 if (allocatable == 0 && attr.pointer == 0)
5926 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
5930 if (check_intent_in && sym->attr.intent == INTENT_IN)
5932 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
5933 sym->name, &e->where);
5937 if (e->ts.type == BT_CLASS)
5939 /* Only deallocate the DATA component. */
5940 gfc_add_component_ref (e, "$data");
5947 /* Returns true if the expression e contains a reference to the symbol sym. */
5949 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
5951 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
5958 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
5960 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
5964 /* Given the expression node e for an allocatable/pointer of derived type to be
5965 allocated, get the expression node to be initialized afterwards (needed for
5966 derived types with default initializers, and derived types with allocatable
5967 components that need nullification.) */
5970 gfc_expr_to_initialize (gfc_expr *e)
5976 result = gfc_copy_expr (e);
5978 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
5979 for (ref = result->ref; ref; ref = ref->next)
5980 if (ref->type == REF_ARRAY && ref->next == NULL)
5982 ref->u.ar.type = AR_FULL;
5984 for (i = 0; i < ref->u.ar.dimen; i++)
5985 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
5987 result->rank = ref->u.ar.dimen;
5995 /* Used in resolve_allocate_expr to check that a allocation-object and
5996 a source-expr are conformable. This does not catch all possible
5997 cases; in particular a runtime checking is needed. */
6000 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6002 /* First compare rank. */
6003 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6005 gfc_error ("Source-expr at %L must be scalar or have the "
6006 "same rank as the allocate-object at %L",
6007 &e1->where, &e2->where);
6018 for (i = 0; i < e1->rank; i++)
6020 if (e2->ref->u.ar.end[i])
6022 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6023 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6024 mpz_add_ui (s, s, 1);
6028 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6031 if (mpz_cmp (e1->shape[i], s) != 0)
6033 gfc_error ("Source-expr at %L and allocate-object at %L must "
6034 "have the same shape", &e1->where, &e2->where);
6047 /* Resolve the expression in an ALLOCATE statement, doing the additional
6048 checks to see whether the expression is OK or not. The expression must
6049 have a trailing array reference that gives the size of the array. */
6052 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6054 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6055 symbol_attribute attr;
6056 gfc_ref *ref, *ref2;
6062 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6063 check_intent_in = 1;
6065 if (gfc_resolve_expr (e) == FAILURE)
6068 /* Make sure the expression is allocatable or a pointer. If it is
6069 pointer, the next-to-last reference must be a pointer. */
6073 sym = e->symtree->n.sym;
6075 /* Check whether ultimate component is abstract and CLASS. */
6078 if (e->expr_type != EXPR_VARIABLE)
6081 attr = gfc_expr_attr (e);
6082 pointer = attr.pointer;
6083 dimension = attr.dimension;
6087 if (sym->ts.type == BT_CLASS)
6089 allocatable = sym->ts.u.derived->components->attr.allocatable;
6090 pointer = sym->ts.u.derived->components->attr.pointer;
6091 dimension = sym->ts.u.derived->components->attr.dimension;
6092 is_abstract = sym->ts.u.derived->components->attr.abstract;
6096 allocatable = sym->attr.allocatable;
6097 pointer = sym->attr.pointer;
6098 dimension = sym->attr.dimension;
6101 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6104 check_intent_in = 0;
6109 if (ref->next != NULL)
6114 c = ref->u.c.component;
6115 if (c->ts.type == BT_CLASS)
6117 allocatable = c->ts.u.derived->components->attr.allocatable;
6118 pointer = c->ts.u.derived->components->attr.pointer;
6119 dimension = c->ts.u.derived->components->attr.dimension;
6120 is_abstract = c->ts.u.derived->components->attr.abstract;
6124 allocatable = c->attr.allocatable;
6125 pointer = c->attr.pointer;
6126 dimension = c->attr.dimension;
6127 is_abstract = c->attr.abstract;
6139 if (allocatable == 0 && pointer == 0)
6141 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6146 /* Some checks for the SOURCE tag. */
6149 /* Check F03:C631. */
6150 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6152 gfc_error ("Type of entity at %L is type incompatible with "
6153 "source-expr at %L", &e->where, &code->expr3->where);
6157 /* Check F03:C632 and restriction following Note 6.18. */
6158 if (code->expr3->rank > 0
6159 && conformable_arrays (code->expr3, e) == FAILURE)
6162 /* Check F03:C633. */
6163 if (code->expr3->ts.kind != e->ts.kind)
6165 gfc_error ("The allocate-object at %L and the source-expr at %L "
6166 "shall have the same kind type parameter",
6167 &e->where, &code->expr3->where);
6171 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6173 gcc_assert (e->ts.type == BT_CLASS);
6174 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6175 "type-spec or SOURCE=", sym->name, &e->where);
6179 if (check_intent_in && sym->attr.intent == INTENT_IN)
6181 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6182 sym->name, &e->where);
6186 if (pointer || dimension == 0)
6189 /* Make sure the next-to-last reference node is an array specification. */
6191 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
6193 gfc_error ("Array specification required in ALLOCATE statement "
6194 "at %L", &e->where);
6198 /* Make sure that the array section reference makes sense in the
6199 context of an ALLOCATE specification. */
6203 for (i = 0; i < ar->dimen; i++)
6205 if (ref2->u.ar.type == AR_ELEMENT)
6208 switch (ar->dimen_type[i])
6214 if (ar->start[i] != NULL
6215 && ar->end[i] != NULL
6216 && ar->stride[i] == NULL)
6219 /* Fall Through... */
6223 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6230 for (a = code->ext.alloc.list; a; a = a->next)
6232 sym = a->expr->symtree->n.sym;
6234 /* TODO - check derived type components. */
6235 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6238 if ((ar->start[i] != NULL
6239 && gfc_find_sym_in_expr (sym, ar->start[i]))
6240 || (ar->end[i] != NULL
6241 && gfc_find_sym_in_expr (sym, ar->end[i])))
6243 gfc_error ("'%s' must not appear in the array specification at "
6244 "%L in the same ALLOCATE statement where it is "
6245 "itself allocated", sym->name, &ar->where);
6255 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6257 gfc_expr *stat, *errmsg, *pe, *qe;
6258 gfc_alloc *a, *p, *q;
6260 stat = code->expr1 ? code->expr1 : NULL;
6262 errmsg = code->expr2 ? code->expr2 : NULL;
6264 /* Check the stat variable. */
6267 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6268 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6269 stat->symtree->n.sym->name, &stat->where);
6271 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6272 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6275 if ((stat->ts.type != BT_INTEGER
6276 && !(stat->ref && (stat->ref->type == REF_ARRAY
6277 || stat->ref->type == REF_COMPONENT)))
6279 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6280 "variable", &stat->where);
6282 for (p = code->ext.alloc.list; p; p = p->next)
6283 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6284 gfc_error ("Stat-variable at %L shall not be %sd within "
6285 "the same %s statement", &stat->where, fcn, fcn);
6288 /* Check the errmsg variable. */
6292 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6295 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6296 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6297 errmsg->symtree->n.sym->name, &errmsg->where);
6299 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6300 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6303 if ((errmsg->ts.type != BT_CHARACTER
6305 && (errmsg->ref->type == REF_ARRAY
6306 || errmsg->ref->type == REF_COMPONENT)))
6307 || errmsg->rank > 0 )
6308 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6309 "variable", &errmsg->where);
6311 for (p = code->ext.alloc.list; p; p = p->next)
6312 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6313 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6314 "the same %s statement", &errmsg->where, fcn, fcn);
6317 /* Check that an allocate-object appears only once in the statement.
6318 FIXME: Checking derived types is disabled. */
6319 for (p = code->ext.alloc.list; p; p = p->next)
6322 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6323 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6325 for (q = p->next; q; q = q->next)
6328 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6329 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6330 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6331 gfc_error ("Allocate-object at %L also appears at %L",
6332 &pe->where, &qe->where);
6337 if (strcmp (fcn, "ALLOCATE") == 0)
6339 for (a = code->ext.alloc.list; a; a = a->next)
6340 resolve_allocate_expr (a->expr, code);
6344 for (a = code->ext.alloc.list; a; a = a->next)
6345 resolve_deallocate_expr (a->expr);
6350 /************ SELECT CASE resolution subroutines ************/
6352 /* Callback function for our mergesort variant. Determines interval
6353 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6354 op1 > op2. Assumes we're not dealing with the default case.
6355 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6356 There are nine situations to check. */
6359 compare_cases (const gfc_case *op1, const gfc_case *op2)
6363 if (op1->low == NULL) /* op1 = (:L) */
6365 /* op2 = (:N), so overlap. */
6367 /* op2 = (M:) or (M:N), L < M */
6368 if (op2->low != NULL
6369 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6372 else if (op1->high == NULL) /* op1 = (K:) */
6374 /* op2 = (M:), so overlap. */
6376 /* op2 = (:N) or (M:N), K > N */
6377 if (op2->high != NULL
6378 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6381 else /* op1 = (K:L) */
6383 if (op2->low == NULL) /* op2 = (:N), K > N */
6384 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6386 else if (op2->high == NULL) /* op2 = (M:), L < M */
6387 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6389 else /* op2 = (M:N) */
6393 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6396 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6405 /* Merge-sort a double linked case list, detecting overlap in the
6406 process. LIST is the head of the double linked case list before it
6407 is sorted. Returns the head of the sorted list if we don't see any
6408 overlap, or NULL otherwise. */
6411 check_case_overlap (gfc_case *list)
6413 gfc_case *p, *q, *e, *tail;
6414 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6416 /* If the passed list was empty, return immediately. */
6423 /* Loop unconditionally. The only exit from this loop is a return
6424 statement, when we've finished sorting the case list. */
6431 /* Count the number of merges we do in this pass. */
6434 /* Loop while there exists a merge to be done. */
6439 /* Count this merge. */
6442 /* Cut the list in two pieces by stepping INSIZE places
6443 forward in the list, starting from P. */
6446 for (i = 0; i < insize; i++)
6455 /* Now we have two lists. Merge them! */
6456 while (psize > 0 || (qsize > 0 && q != NULL))
6458 /* See from which the next case to merge comes from. */
6461 /* P is empty so the next case must come from Q. */
6466 else if (qsize == 0 || q == NULL)
6475 cmp = compare_cases (p, q);
6478 /* The whole case range for P is less than the
6486 /* The whole case range for Q is greater than
6487 the case range for P. */
6494 /* The cases overlap, or they are the same
6495 element in the list. Either way, we must
6496 issue an error and get the next case from P. */
6497 /* FIXME: Sort P and Q by line number. */
6498 gfc_error ("CASE label at %L overlaps with CASE "
6499 "label at %L", &p->where, &q->where);
6507 /* Add the next element to the merged list. */
6516 /* P has now stepped INSIZE places along, and so has Q. So
6517 they're the same. */
6522 /* If we have done only one merge or none at all, we've
6523 finished sorting the cases. */
6532 /* Otherwise repeat, merging lists twice the size. */
6538 /* Check to see if an expression is suitable for use in a CASE statement.
6539 Makes sure that all case expressions are scalar constants of the same
6540 type. Return FAILURE if anything is wrong. */
6543 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6545 if (e == NULL) return SUCCESS;
6547 if (e->ts.type != case_expr->ts.type)
6549 gfc_error ("Expression in CASE statement at %L must be of type %s",
6550 &e->where, gfc_basic_typename (case_expr->ts.type));
6554 /* C805 (R808) For a given case-construct, each case-value shall be of
6555 the same type as case-expr. For character type, length differences
6556 are allowed, but the kind type parameters shall be the same. */
6558 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6560 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6561 &e->where, case_expr->ts.kind);
6565 /* Convert the case value kind to that of case expression kind, if needed.
6566 FIXME: Should a warning be issued? */
6567 if (e->ts.kind != case_expr->ts.kind)
6568 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6572 gfc_error ("Expression in CASE statement at %L must be scalar",
6581 /* Given a completely parsed select statement, we:
6583 - Validate all expressions and code within the SELECT.
6584 - Make sure that the selection expression is not of the wrong type.
6585 - Make sure that no case ranges overlap.
6586 - Eliminate unreachable cases and unreachable code resulting from
6587 removing case labels.
6589 The standard does allow unreachable cases, e.g. CASE (5:3). But
6590 they are a hassle for code generation, and to prevent that, we just
6591 cut them out here. This is not necessary for overlapping cases
6592 because they are illegal and we never even try to generate code.
6594 We have the additional caveat that a SELECT construct could have
6595 been a computed GOTO in the source code. Fortunately we can fairly
6596 easily work around that here: The case_expr for a "real" SELECT CASE
6597 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6598 we have to do is make sure that the case_expr is a scalar integer
6602 resolve_select (gfc_code *code)
6605 gfc_expr *case_expr;
6606 gfc_case *cp, *default_case, *tail, *head;
6607 int seen_unreachable;
6613 if (code->expr1 == NULL)
6615 /* This was actually a computed GOTO statement. */
6616 case_expr = code->expr2;
6617 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6618 gfc_error ("Selection expression in computed GOTO statement "
6619 "at %L must be a scalar integer expression",
6622 /* Further checking is not necessary because this SELECT was built
6623 by the compiler, so it should always be OK. Just move the
6624 case_expr from expr2 to expr so that we can handle computed
6625 GOTOs as normal SELECTs from here on. */
6626 code->expr1 = code->expr2;
6631 case_expr = code->expr1;
6633 type = case_expr->ts.type;
6634 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6636 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6637 &case_expr->where, gfc_typename (&case_expr->ts));
6639 /* Punt. Going on here just produce more garbage error messages. */
6643 if (case_expr->rank != 0)
6645 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6646 "expression", &case_expr->where);
6652 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6653 of the SELECT CASE expression and its CASE values. Walk the lists
6654 of case values, and if we find a mismatch, promote case_expr to
6655 the appropriate kind. */
6657 if (type == BT_LOGICAL || type == BT_INTEGER)
6659 for (body = code->block; body; body = body->block)
6661 /* Walk the case label list. */
6662 for (cp = body->ext.case_list; cp; cp = cp->next)
6664 /* Intercept the DEFAULT case. It does not have a kind. */
6665 if (cp->low == NULL && cp->high == NULL)
6668 /* Unreachable case ranges are discarded, so ignore. */
6669 if (cp->low != NULL && cp->high != NULL
6670 && cp->low != cp->high
6671 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6674 /* FIXME: Should a warning be issued? */
6676 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6677 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6679 if (cp->high != NULL
6680 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6681 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6686 /* Assume there is no DEFAULT case. */
6687 default_case = NULL;
6692 for (body = code->block; body; body = body->block)
6694 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6696 seen_unreachable = 0;
6698 /* Walk the case label list, making sure that all case labels
6700 for (cp = body->ext.case_list; cp; cp = cp->next)
6702 /* Count the number of cases in the whole construct. */
6705 /* Intercept the DEFAULT case. */
6706 if (cp->low == NULL && cp->high == NULL)
6708 if (default_case != NULL)
6710 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6711 "by a second DEFAULT CASE at %L",
6712 &default_case->where, &cp->where);
6723 /* Deal with single value cases and case ranges. Errors are
6724 issued from the validation function. */
6725 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
6726 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
6732 if (type == BT_LOGICAL
6733 && ((cp->low == NULL || cp->high == NULL)
6734 || cp->low != cp->high))
6736 gfc_error ("Logical range in CASE statement at %L is not "
6737 "allowed", &cp->low->where);
6742 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
6745 value = cp->low->value.logical == 0 ? 2 : 1;
6746 if (value & seen_logical)
6748 gfc_error ("constant logical value in CASE statement "
6749 "is repeated at %L",
6754 seen_logical |= value;
6757 if (cp->low != NULL && cp->high != NULL
6758 && cp->low != cp->high
6759 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6761 if (gfc_option.warn_surprising)
6762 gfc_warning ("Range specification at %L can never "
6763 "be matched", &cp->where);
6765 cp->unreachable = 1;
6766 seen_unreachable = 1;
6770 /* If the case range can be matched, it can also overlap with
6771 other cases. To make sure it does not, we put it in a
6772 double linked list here. We sort that with a merge sort
6773 later on to detect any overlapping cases. */
6777 head->right = head->left = NULL;
6782 tail->right->left = tail;
6789 /* It there was a failure in the previous case label, give up
6790 for this case label list. Continue with the next block. */
6794 /* See if any case labels that are unreachable have been seen.
6795 If so, we eliminate them. This is a bit of a kludge because
6796 the case lists for a single case statement (label) is a
6797 single forward linked lists. */
6798 if (seen_unreachable)
6800 /* Advance until the first case in the list is reachable. */
6801 while (body->ext.case_list != NULL
6802 && body->ext.case_list->unreachable)
6804 gfc_case *n = body->ext.case_list;
6805 body->ext.case_list = body->ext.case_list->next;
6807 gfc_free_case_list (n);
6810 /* Strip all other unreachable cases. */
6811 if (body->ext.case_list)
6813 for (cp = body->ext.case_list; cp->next; cp = cp->next)
6815 if (cp->next->unreachable)
6817 gfc_case *n = cp->next;
6818 cp->next = cp->next->next;
6820 gfc_free_case_list (n);
6827 /* See if there were overlapping cases. If the check returns NULL,
6828 there was overlap. In that case we don't do anything. If head
6829 is non-NULL, we prepend the DEFAULT case. The sorted list can
6830 then used during code generation for SELECT CASE constructs with
6831 a case expression of a CHARACTER type. */
6834 head = check_case_overlap (head);
6836 /* Prepend the default_case if it is there. */
6837 if (head != NULL && default_case)
6839 default_case->left = NULL;
6840 default_case->right = head;
6841 head->left = default_case;
6845 /* Eliminate dead blocks that may be the result if we've seen
6846 unreachable case labels for a block. */
6847 for (body = code; body && body->block; body = body->block)
6849 if (body->block->ext.case_list == NULL)
6851 /* Cut the unreachable block from the code chain. */
6852 gfc_code *c = body->block;
6853 body->block = c->block;
6855 /* Kill the dead block, but not the blocks below it. */
6857 gfc_free_statements (c);
6861 /* More than two cases is legal but insane for logical selects.
6862 Issue a warning for it. */
6863 if (gfc_option.warn_surprising && type == BT_LOGICAL
6865 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
6870 /* Check if a derived type is extensible. */
6873 gfc_type_is_extensible (gfc_symbol *sym)
6875 return !(sym->attr.is_bind_c || sym->attr.sequence);
6879 /* Resolve a SELECT TYPE statement. */
6882 resolve_select_type (gfc_code *code)
6884 gfc_symbol *selector_type;
6885 gfc_code *body, *new_st, *if_st, *tail;
6886 gfc_code *class_is = NULL, *default_case = NULL;
6889 char name[GFC_MAX_SYMBOL_LEN];
6897 selector_type = code->expr2->ts.u.derived->components->ts.u.derived;
6899 selector_type = code->expr1->ts.u.derived->components->ts.u.derived;
6901 /* Loop over TYPE IS / CLASS IS cases. */
6902 for (body = code->block; body; body = body->block)
6904 c = body->ext.case_list;
6906 /* Check F03:C815. */
6907 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6908 && !gfc_type_is_extensible (c->ts.u.derived))
6910 gfc_error ("Derived type '%s' at %L must be extensible",
6911 c->ts.u.derived->name, &c->where);
6916 /* Check F03:C816. */
6917 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
6918 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
6920 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
6921 c->ts.u.derived->name, &c->where, selector_type->name);
6926 /* Intercept the DEFAULT case. */
6927 if (c->ts.type == BT_UNKNOWN)
6929 /* Check F03:C818. */
6932 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6933 "by a second DEFAULT CASE at %L",
6934 &default_case->ext.case_list->where, &c->where);
6939 default_case = body;
6948 /* Insert assignment for selector variable. */
6949 new_st = gfc_get_code ();
6950 new_st->op = EXEC_ASSIGN;
6951 new_st->expr1 = gfc_copy_expr (code->expr1);
6952 new_st->expr2 = gfc_copy_expr (code->expr2);
6956 /* Put SELECT TYPE statement inside a BLOCK. */
6957 new_st = gfc_get_code ();
6958 new_st->op = code->op;
6959 new_st->expr1 = code->expr1;
6960 new_st->expr2 = code->expr2;
6961 new_st->block = code->block;
6965 ns->code->next = new_st;
6966 code->op = EXEC_BLOCK;
6967 code->expr1 = code->expr2 = NULL;
6972 /* Transform to EXEC_SELECT. */
6973 code->op = EXEC_SELECT;
6974 gfc_add_component_ref (code->expr1, "$vptr");
6975 gfc_add_component_ref (code->expr1, "$hash");
6977 /* Loop over TYPE IS / CLASS IS cases. */
6978 for (body = code->block; body; body = body->block)
6980 c = body->ext.case_list;
6982 if (c->ts.type == BT_DERIVED)
6983 c->low = c->high = gfc_int_expr (c->ts.u.derived->hash_value);
6984 else if (c->ts.type == BT_UNKNOWN)
6987 /* Assign temporary to selector. */
6988 if (c->ts.type == BT_CLASS)
6989 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
6991 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
6992 st = gfc_find_symtree (ns->sym_root, name);
6993 new_st = gfc_get_code ();
6994 new_st->expr1 = gfc_get_variable_expr (st);
6995 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
6996 if (c->ts.type == BT_DERIVED)
6998 new_st->op = EXEC_POINTER_ASSIGN;
6999 gfc_add_component_ref (new_st->expr2, "$data");
7002 new_st->op = EXEC_POINTER_ASSIGN;
7003 new_st->next = body->next;
7004 body->next = new_st;
7007 /* Take out CLASS IS cases for separate treatment. */
7009 while (body && body->block)
7011 if (body->block->ext.case_list->ts.type == BT_CLASS)
7013 /* Add to class_is list. */
7014 if (class_is == NULL)
7016 class_is = body->block;
7021 for (tail = class_is; tail->block; tail = tail->block) ;
7022 tail->block = body->block;
7025 /* Remove from EXEC_SELECT list. */
7026 body->block = body->block->block;
7039 /* Add a default case to hold the CLASS IS cases. */
7040 for (tail = code; tail->block; tail = tail->block) ;
7041 tail->block = gfc_get_code ();
7043 tail->op = EXEC_SELECT_TYPE;
7044 tail->ext.case_list = gfc_get_case ();
7045 tail->ext.case_list->ts.type = BT_UNKNOWN;
7047 default_case = tail;
7050 /* More than one CLASS IS block? */
7051 if (class_is->block)
7055 /* Sort CLASS IS blocks by extension level. */
7059 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7062 /* F03:C817 (check for doubles). */
7063 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7064 == c2->ext.case_list->ts.u.derived->hash_value)
7066 gfc_error ("Double CLASS IS block in SELECT TYPE "
7067 "statement at %L", &c2->ext.case_list->where);
7070 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7071 < c2->ext.case_list->ts.u.derived->attr.extension)
7074 (*c1)->block = c2->block;
7084 /* Generate IF chain. */
7085 if_st = gfc_get_code ();
7086 if_st->op = EXEC_IF;
7088 for (body = class_is; body; body = body->block)
7090 new_st->block = gfc_get_code ();
7091 new_st = new_st->block;
7092 new_st->op = EXEC_IF;
7093 /* Set up IF condition: Call _gfortran_is_extension_of. */
7094 new_st->expr1 = gfc_get_expr ();
7095 new_st->expr1->expr_type = EXPR_FUNCTION;
7096 new_st->expr1->ts.type = BT_LOGICAL;
7097 new_st->expr1->ts.kind = 4;
7098 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7099 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7100 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7101 /* Set up arguments. */
7102 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7103 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7104 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7105 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived);
7106 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7107 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7108 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7109 new_st->next = body->next;
7111 if (default_case->next)
7113 new_st->block = gfc_get_code ();
7114 new_st = new_st->block;
7115 new_st->op = EXEC_IF;
7116 new_st->next = default_case->next;
7119 /* Replace CLASS DEFAULT code by the IF chain. */
7120 default_case->next = if_st;
7123 resolve_select (code);
7128 /* Resolve a transfer statement. This is making sure that:
7129 -- a derived type being transferred has only non-pointer components
7130 -- a derived type being transferred doesn't have private components, unless
7131 it's being transferred from the module where the type was defined
7132 -- we're not trying to transfer a whole assumed size array. */
7135 resolve_transfer (gfc_code *code)
7144 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7147 sym = exp->symtree->n.sym;
7150 /* Go to actual component transferred. */
7151 for (ref = code->expr1->ref; ref; ref = ref->next)
7152 if (ref->type == REF_COMPONENT)
7153 ts = &ref->u.c.component->ts;
7155 if (ts->type == BT_DERIVED)
7157 /* Check that transferred derived type doesn't contain POINTER
7159 if (ts->u.derived->attr.pointer_comp)
7161 gfc_error ("Data transfer element at %L cannot have "
7162 "POINTER components", &code->loc);
7166 if (ts->u.derived->attr.alloc_comp)
7168 gfc_error ("Data transfer element at %L cannot have "
7169 "ALLOCATABLE components", &code->loc);
7173 if (derived_inaccessible (ts->u.derived))
7175 gfc_error ("Data transfer element at %L cannot have "
7176 "PRIVATE components",&code->loc);
7181 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7182 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7184 gfc_error ("Data transfer element at %L cannot be a full reference to "
7185 "an assumed-size array", &code->loc);
7191 /*********** Toplevel code resolution subroutines ***********/
7193 /* Find the set of labels that are reachable from this block. We also
7194 record the last statement in each block. */
7197 find_reachable_labels (gfc_code *block)
7204 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7206 /* Collect labels in this block. We don't keep those corresponding
7207 to END {IF|SELECT}, these are checked in resolve_branch by going
7208 up through the code_stack. */
7209 for (c = block; c; c = c->next)
7211 if (c->here && c->op != EXEC_END_BLOCK)
7212 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7215 /* Merge with labels from parent block. */
7218 gcc_assert (cs_base->prev->reachable_labels);
7219 bitmap_ior_into (cs_base->reachable_labels,
7220 cs_base->prev->reachable_labels);
7224 /* Given a branch to a label, see if the branch is conforming.
7225 The code node describes where the branch is located. */
7228 resolve_branch (gfc_st_label *label, gfc_code *code)
7235 /* Step one: is this a valid branching target? */
7237 if (label->defined == ST_LABEL_UNKNOWN)
7239 gfc_error ("Label %d referenced at %L is never defined", label->value,
7244 if (label->defined != ST_LABEL_TARGET)
7246 gfc_error ("Statement at %L is not a valid branch target statement "
7247 "for the branch statement at %L", &label->where, &code->loc);
7251 /* Step two: make sure this branch is not a branch to itself ;-) */
7253 if (code->here == label)
7255 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7259 /* Step three: See if the label is in the same block as the
7260 branching statement. The hard work has been done by setting up
7261 the bitmap reachable_labels. */
7263 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7266 /* Step four: If we haven't found the label in the bitmap, it may
7267 still be the label of the END of the enclosing block, in which
7268 case we find it by going up the code_stack. */
7270 for (stack = cs_base; stack; stack = stack->prev)
7271 if (stack->current->next && stack->current->next->here == label)
7276 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7280 /* The label is not in an enclosing block, so illegal. This was
7281 allowed in Fortran 66, so we allow it as extension. No
7282 further checks are necessary in this case. */
7283 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7284 "as the GOTO statement at %L", &label->where,
7290 /* Check whether EXPR1 has the same shape as EXPR2. */
7293 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7295 mpz_t shape[GFC_MAX_DIMENSIONS];
7296 mpz_t shape2[GFC_MAX_DIMENSIONS];
7297 gfc_try result = FAILURE;
7300 /* Compare the rank. */
7301 if (expr1->rank != expr2->rank)
7304 /* Compare the size of each dimension. */
7305 for (i=0; i<expr1->rank; i++)
7307 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7310 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7313 if (mpz_cmp (shape[i], shape2[i]))
7317 /* When either of the two expression is an assumed size array, we
7318 ignore the comparison of dimension sizes. */
7323 for (i--; i >= 0; i--)
7325 mpz_clear (shape[i]);
7326 mpz_clear (shape2[i]);
7332 /* Check whether a WHERE assignment target or a WHERE mask expression
7333 has the same shape as the outmost WHERE mask expression. */
7336 resolve_where (gfc_code *code, gfc_expr *mask)
7342 cblock = code->block;
7344 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7345 In case of nested WHERE, only the outmost one is stored. */
7346 if (mask == NULL) /* outmost WHERE */
7348 else /* inner WHERE */
7355 /* Check if the mask-expr has a consistent shape with the
7356 outmost WHERE mask-expr. */
7357 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7358 gfc_error ("WHERE mask at %L has inconsistent shape",
7359 &cblock->expr1->where);
7362 /* the assignment statement of a WHERE statement, or the first
7363 statement in where-body-construct of a WHERE construct */
7364 cnext = cblock->next;
7369 /* WHERE assignment statement */
7372 /* Check shape consistent for WHERE assignment target. */
7373 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7374 gfc_error ("WHERE assignment target at %L has "
7375 "inconsistent shape", &cnext->expr1->where);
7379 case EXEC_ASSIGN_CALL:
7380 resolve_call (cnext);
7381 if (!cnext->resolved_sym->attr.elemental)
7382 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7383 &cnext->ext.actual->expr->where);
7386 /* WHERE or WHERE construct is part of a where-body-construct */
7388 resolve_where (cnext, e);
7392 gfc_error ("Unsupported statement inside WHERE at %L",
7395 /* the next statement within the same where-body-construct */
7396 cnext = cnext->next;
7398 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7399 cblock = cblock->block;
7404 /* Resolve assignment in FORALL construct.
7405 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7406 FORALL index variables. */
7409 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7413 for (n = 0; n < nvar; n++)
7415 gfc_symbol *forall_index;
7417 forall_index = var_expr[n]->symtree->n.sym;
7419 /* Check whether the assignment target is one of the FORALL index
7421 if ((code->expr1->expr_type == EXPR_VARIABLE)
7422 && (code->expr1->symtree->n.sym == forall_index))
7423 gfc_error ("Assignment to a FORALL index variable at %L",
7424 &code->expr1->where);
7427 /* If one of the FORALL index variables doesn't appear in the
7428 assignment variable, then there could be a many-to-one
7429 assignment. Emit a warning rather than an error because the
7430 mask could be resolving this problem. */
7431 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7432 gfc_warning ("The FORALL with index '%s' is not used on the "
7433 "left side of the assignment at %L and so might "
7434 "cause multiple assignment to this object",
7435 var_expr[n]->symtree->name, &code->expr1->where);
7441 /* Resolve WHERE statement in FORALL construct. */
7444 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7445 gfc_expr **var_expr)
7450 cblock = code->block;
7453 /* the assignment statement of a WHERE statement, or the first
7454 statement in where-body-construct of a WHERE construct */
7455 cnext = cblock->next;
7460 /* WHERE assignment statement */
7462 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7465 /* WHERE operator assignment statement */
7466 case EXEC_ASSIGN_CALL:
7467 resolve_call (cnext);
7468 if (!cnext->resolved_sym->attr.elemental)
7469 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7470 &cnext->ext.actual->expr->where);
7473 /* WHERE or WHERE construct is part of a where-body-construct */
7475 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7479 gfc_error ("Unsupported statement inside WHERE at %L",
7482 /* the next statement within the same where-body-construct */
7483 cnext = cnext->next;
7485 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7486 cblock = cblock->block;
7491 /* Traverse the FORALL body to check whether the following errors exist:
7492 1. For assignment, check if a many-to-one assignment happens.
7493 2. For WHERE statement, check the WHERE body to see if there is any
7494 many-to-one assignment. */
7497 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7501 c = code->block->next;
7507 case EXEC_POINTER_ASSIGN:
7508 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7511 case EXEC_ASSIGN_CALL:
7515 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7516 there is no need to handle it here. */
7520 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7525 /* The next statement in the FORALL body. */
7531 /* Counts the number of iterators needed inside a forall construct, including
7532 nested forall constructs. This is used to allocate the needed memory
7533 in gfc_resolve_forall. */
7536 gfc_count_forall_iterators (gfc_code *code)
7538 int max_iters, sub_iters, current_iters;
7539 gfc_forall_iterator *fa;
7541 gcc_assert(code->op == EXEC_FORALL);
7545 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7548 code = code->block->next;
7552 if (code->op == EXEC_FORALL)
7554 sub_iters = gfc_count_forall_iterators (code);
7555 if (sub_iters > max_iters)
7556 max_iters = sub_iters;
7561 return current_iters + max_iters;
7565 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7566 gfc_resolve_forall_body to resolve the FORALL body. */
7569 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7571 static gfc_expr **var_expr;
7572 static int total_var = 0;
7573 static int nvar = 0;
7575 gfc_forall_iterator *fa;
7580 /* Start to resolve a FORALL construct */
7581 if (forall_save == 0)
7583 /* Count the total number of FORALL index in the nested FORALL
7584 construct in order to allocate the VAR_EXPR with proper size. */
7585 total_var = gfc_count_forall_iterators (code);
7587 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7588 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7591 /* The information about FORALL iterator, including FORALL index start, end
7592 and stride. The FORALL index can not appear in start, end or stride. */
7593 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7595 /* Check if any outer FORALL index name is the same as the current
7597 for (i = 0; i < nvar; i++)
7599 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7601 gfc_error ("An outer FORALL construct already has an index "
7602 "with this name %L", &fa->var->where);
7606 /* Record the current FORALL index. */
7607 var_expr[nvar] = gfc_copy_expr (fa->var);
7611 /* No memory leak. */
7612 gcc_assert (nvar <= total_var);
7615 /* Resolve the FORALL body. */
7616 gfc_resolve_forall_body (code, nvar, var_expr);
7618 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7619 gfc_resolve_blocks (code->block, ns);
7623 /* Free only the VAR_EXPRs allocated in this frame. */
7624 for (i = nvar; i < tmp; i++)
7625 gfc_free_expr (var_expr[i]);
7629 /* We are in the outermost FORALL construct. */
7630 gcc_assert (forall_save == 0);
7632 /* VAR_EXPR is not needed any more. */
7633 gfc_free (var_expr);
7639 /* Resolve a BLOCK construct statement. */
7642 resolve_block_construct (gfc_code* code)
7644 /* Eventually, we may want to do some checks here or handle special stuff.
7645 But so far the only thing we can do is resolving the local namespace. */
7647 gfc_resolve (code->ext.ns);
7651 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
7654 static void resolve_code (gfc_code *, gfc_namespace *);
7657 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
7661 for (; b; b = b->block)
7663 t = gfc_resolve_expr (b->expr1);
7664 if (gfc_resolve_expr (b->expr2) == FAILURE)
7670 if (t == SUCCESS && b->expr1 != NULL
7671 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
7672 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
7679 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
7680 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
7685 resolve_branch (b->label1, b);
7689 resolve_block_construct (b);
7693 case EXEC_SELECT_TYPE:
7703 case EXEC_OMP_ATOMIC:
7704 case EXEC_OMP_CRITICAL:
7706 case EXEC_OMP_MASTER:
7707 case EXEC_OMP_ORDERED:
7708 case EXEC_OMP_PARALLEL:
7709 case EXEC_OMP_PARALLEL_DO:
7710 case EXEC_OMP_PARALLEL_SECTIONS:
7711 case EXEC_OMP_PARALLEL_WORKSHARE:
7712 case EXEC_OMP_SECTIONS:
7713 case EXEC_OMP_SINGLE:
7715 case EXEC_OMP_TASKWAIT:
7716 case EXEC_OMP_WORKSHARE:
7720 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
7723 resolve_code (b->next, ns);
7728 /* Does everything to resolve an ordinary assignment. Returns true
7729 if this is an interface assignment. */
7731 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
7741 if (gfc_extend_assign (code, ns) == SUCCESS)
7745 if (code->op == EXEC_ASSIGN_CALL)
7747 lhs = code->ext.actual->expr;
7748 rhsptr = &code->ext.actual->next->expr;
7752 gfc_actual_arglist* args;
7753 gfc_typebound_proc* tbp;
7755 gcc_assert (code->op == EXEC_COMPCALL);
7757 args = code->expr1->value.compcall.actual;
7759 rhsptr = &args->next->expr;
7761 tbp = code->expr1->value.compcall.tbp;
7762 gcc_assert (!tbp->is_generic);
7765 /* Make a temporary rhs when there is a default initializer
7766 and rhs is the same symbol as the lhs. */
7767 if ((*rhsptr)->expr_type == EXPR_VARIABLE
7768 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
7769 && has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
7770 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
7771 *rhsptr = gfc_get_parentheses (*rhsptr);
7780 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
7781 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
7782 &code->loc) == FAILURE)
7785 /* Handle the case of a BOZ literal on the RHS. */
7786 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
7789 if (gfc_option.warn_surprising)
7790 gfc_warning ("BOZ literal at %L is bitwise transferred "
7791 "non-integer symbol '%s'", &code->loc,
7792 lhs->symtree->n.sym->name);
7794 if (!gfc_convert_boz (rhs, &lhs->ts))
7796 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
7798 if (rc == ARITH_UNDERFLOW)
7799 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
7800 ". This check can be disabled with the option "
7801 "-fno-range-check", &rhs->where);
7802 else if (rc == ARITH_OVERFLOW)
7803 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
7804 ". This check can be disabled with the option "
7805 "-fno-range-check", &rhs->where);
7806 else if (rc == ARITH_NAN)
7807 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
7808 ". This check can be disabled with the option "
7809 "-fno-range-check", &rhs->where);
7815 if (lhs->ts.type == BT_CHARACTER
7816 && gfc_option.warn_character_truncation)
7818 if (lhs->ts.u.cl != NULL
7819 && lhs->ts.u.cl->length != NULL
7820 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7821 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
7823 if (rhs->expr_type == EXPR_CONSTANT)
7824 rlen = rhs->value.character.length;
7826 else if (rhs->ts.u.cl != NULL
7827 && rhs->ts.u.cl->length != NULL
7828 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
7829 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
7831 if (rlen && llen && rlen > llen)
7832 gfc_warning_now ("CHARACTER expression will be truncated "
7833 "in assignment (%d/%d) at %L",
7834 llen, rlen, &code->loc);
7837 /* Ensure that a vector index expression for the lvalue is evaluated
7838 to a temporary if the lvalue symbol is referenced in it. */
7841 for (ref = lhs->ref; ref; ref= ref->next)
7842 if (ref->type == REF_ARRAY)
7844 for (n = 0; n < ref->u.ar.dimen; n++)
7845 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
7846 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
7847 ref->u.ar.start[n]))
7849 = gfc_get_parentheses (ref->u.ar.start[n]);
7853 if (gfc_pure (NULL))
7855 if (gfc_impure_variable (lhs->symtree->n.sym))
7857 gfc_error ("Cannot assign to variable '%s' in PURE "
7859 lhs->symtree->n.sym->name,
7864 if (lhs->ts.type == BT_DERIVED
7865 && lhs->expr_type == EXPR_VARIABLE
7866 && lhs->ts.u.derived->attr.pointer_comp
7867 && gfc_impure_variable (rhs->symtree->n.sym))
7869 gfc_error ("The impure variable at %L is assigned to "
7870 "a derived type variable with a POINTER "
7871 "component in a PURE procedure (12.6)",
7878 if (lhs->ts.type == BT_CLASS)
7880 gfc_error ("Variable must not be polymorphic in assignment at %L",
7885 gfc_check_assign (lhs, rhs, 1);
7890 /* Given a block of code, recursively resolve everything pointed to by this
7894 resolve_code (gfc_code *code, gfc_namespace *ns)
7896 int omp_workshare_save;
7901 frame.prev = cs_base;
7905 find_reachable_labels (code);
7907 for (; code; code = code->next)
7909 frame.current = code;
7910 forall_save = forall_flag;
7912 if (code->op == EXEC_FORALL)
7915 gfc_resolve_forall (code, ns, forall_save);
7918 else if (code->block)
7920 omp_workshare_save = -1;
7923 case EXEC_OMP_PARALLEL_WORKSHARE:
7924 omp_workshare_save = omp_workshare_flag;
7925 omp_workshare_flag = 1;
7926 gfc_resolve_omp_parallel_blocks (code, ns);
7928 case EXEC_OMP_PARALLEL:
7929 case EXEC_OMP_PARALLEL_DO:
7930 case EXEC_OMP_PARALLEL_SECTIONS:
7932 omp_workshare_save = omp_workshare_flag;
7933 omp_workshare_flag = 0;
7934 gfc_resolve_omp_parallel_blocks (code, ns);
7937 gfc_resolve_omp_do_blocks (code, ns);
7939 case EXEC_OMP_WORKSHARE:
7940 omp_workshare_save = omp_workshare_flag;
7941 omp_workshare_flag = 1;
7944 gfc_resolve_blocks (code->block, ns);
7948 if (omp_workshare_save != -1)
7949 omp_workshare_flag = omp_workshare_save;
7953 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
7954 t = gfc_resolve_expr (code->expr1);
7955 forall_flag = forall_save;
7957 if (gfc_resolve_expr (code->expr2) == FAILURE)
7960 if (code->op == EXEC_ALLOCATE
7961 && gfc_resolve_expr (code->expr3) == FAILURE)
7967 case EXEC_END_BLOCK:
7974 case EXEC_ASSIGN_CALL:
7978 /* Keep track of which entry we are up to. */
7979 current_entry_id = code->ext.entry->id;
7983 resolve_where (code, NULL);
7987 if (code->expr1 != NULL)
7989 if (code->expr1->ts.type != BT_INTEGER)
7990 gfc_error ("ASSIGNED GOTO statement at %L requires an "
7991 "INTEGER variable", &code->expr1->where);
7992 else if (code->expr1->symtree->n.sym->attr.assign != 1)
7993 gfc_error ("Variable '%s' has not been assigned a target "
7994 "label at %L", code->expr1->symtree->n.sym->name,
7995 &code->expr1->where);
7998 resolve_branch (code->label1, code);
8002 if (code->expr1 != NULL
8003 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8004 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8005 "INTEGER return specifier", &code->expr1->where);
8008 case EXEC_INIT_ASSIGN:
8009 case EXEC_END_PROCEDURE:
8016 if (resolve_ordinary_assign (code, ns))
8018 if (code->op == EXEC_COMPCALL)
8025 case EXEC_LABEL_ASSIGN:
8026 if (code->label1->defined == ST_LABEL_UNKNOWN)
8027 gfc_error ("Label %d referenced at %L is never defined",
8028 code->label1->value, &code->label1->where);
8030 && (code->expr1->expr_type != EXPR_VARIABLE
8031 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8032 || code->expr1->symtree->n.sym->ts.kind
8033 != gfc_default_integer_kind
8034 || code->expr1->symtree->n.sym->as != NULL))
8035 gfc_error ("ASSIGN statement at %L requires a scalar "
8036 "default INTEGER variable", &code->expr1->where);
8039 case EXEC_POINTER_ASSIGN:
8043 gfc_check_pointer_assign (code->expr1, code->expr2);
8046 case EXEC_ARITHMETIC_IF:
8048 && code->expr1->ts.type != BT_INTEGER
8049 && code->expr1->ts.type != BT_REAL)
8050 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8051 "expression", &code->expr1->where);
8053 resolve_branch (code->label1, code);
8054 resolve_branch (code->label2, code);
8055 resolve_branch (code->label3, code);
8059 if (t == SUCCESS && code->expr1 != NULL
8060 && (code->expr1->ts.type != BT_LOGICAL
8061 || code->expr1->rank != 0))
8062 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8063 &code->expr1->where);
8068 resolve_call (code);
8073 if (code->expr1->symtree
8074 && code->expr1->symtree->n.sym->ts.type == BT_CLASS)
8075 resolve_class_typebound_call (code);
8077 resolve_typebound_call (code);
8081 resolve_ppc_call (code);
8085 /* Select is complicated. Also, a SELECT construct could be
8086 a transformed computed GOTO. */
8087 resolve_select (code);
8090 case EXEC_SELECT_TYPE:
8091 resolve_select_type (code);
8095 gfc_resolve (code->ext.ns);
8099 if (code->ext.iterator != NULL)
8101 gfc_iterator *iter = code->ext.iterator;
8102 if (gfc_resolve_iterator (iter, true) != FAILURE)
8103 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8108 if (code->expr1 == NULL)
8109 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8111 && (code->expr1->rank != 0
8112 || code->expr1->ts.type != BT_LOGICAL))
8113 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8114 "a scalar LOGICAL expression", &code->expr1->where);
8119 resolve_allocate_deallocate (code, "ALLOCATE");
8123 case EXEC_DEALLOCATE:
8125 resolve_allocate_deallocate (code, "DEALLOCATE");
8130 if (gfc_resolve_open (code->ext.open) == FAILURE)
8133 resolve_branch (code->ext.open->err, code);
8137 if (gfc_resolve_close (code->ext.close) == FAILURE)
8140 resolve_branch (code->ext.close->err, code);
8143 case EXEC_BACKSPACE:
8147 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8150 resolve_branch (code->ext.filepos->err, code);
8154 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8157 resolve_branch (code->ext.inquire->err, code);
8161 gcc_assert (code->ext.inquire != NULL);
8162 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8165 resolve_branch (code->ext.inquire->err, code);
8169 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8172 resolve_branch (code->ext.wait->err, code);
8173 resolve_branch (code->ext.wait->end, code);
8174 resolve_branch (code->ext.wait->eor, code);
8179 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8182 resolve_branch (code->ext.dt->err, code);
8183 resolve_branch (code->ext.dt->end, code);
8184 resolve_branch (code->ext.dt->eor, code);
8188 resolve_transfer (code);
8192 resolve_forall_iterators (code->ext.forall_iterator);
8194 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8195 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8196 "expression", &code->expr1->where);
8199 case EXEC_OMP_ATOMIC:
8200 case EXEC_OMP_BARRIER:
8201 case EXEC_OMP_CRITICAL:
8202 case EXEC_OMP_FLUSH:
8204 case EXEC_OMP_MASTER:
8205 case EXEC_OMP_ORDERED:
8206 case EXEC_OMP_SECTIONS:
8207 case EXEC_OMP_SINGLE:
8208 case EXEC_OMP_TASKWAIT:
8209 case EXEC_OMP_WORKSHARE:
8210 gfc_resolve_omp_directive (code, ns);
8213 case EXEC_OMP_PARALLEL:
8214 case EXEC_OMP_PARALLEL_DO:
8215 case EXEC_OMP_PARALLEL_SECTIONS:
8216 case EXEC_OMP_PARALLEL_WORKSHARE:
8218 omp_workshare_save = omp_workshare_flag;
8219 omp_workshare_flag = 0;
8220 gfc_resolve_omp_directive (code, ns);
8221 omp_workshare_flag = omp_workshare_save;
8225 gfc_internal_error ("resolve_code(): Bad statement code");
8229 cs_base = frame.prev;
8233 /* Resolve initial values and make sure they are compatible with
8237 resolve_values (gfc_symbol *sym)
8239 if (sym->value == NULL)
8242 if (gfc_resolve_expr (sym->value) == FAILURE)
8245 gfc_check_assign_symbol (sym, sym->value);
8249 /* Verify the binding labels for common blocks that are BIND(C). The label
8250 for a BIND(C) common block must be identical in all scoping units in which
8251 the common block is declared. Further, the binding label can not collide
8252 with any other global entity in the program. */
8255 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8257 if (comm_block_tree->n.common->is_bind_c == 1)
8259 gfc_gsymbol *binding_label_gsym;
8260 gfc_gsymbol *comm_name_gsym;
8262 /* See if a global symbol exists by the common block's name. It may
8263 be NULL if the common block is use-associated. */
8264 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8265 comm_block_tree->n.common->name);
8266 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8267 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8268 "with the global entity '%s' at %L",
8269 comm_block_tree->n.common->binding_label,
8270 comm_block_tree->n.common->name,
8271 &(comm_block_tree->n.common->where),
8272 comm_name_gsym->name, &(comm_name_gsym->where));
8273 else if (comm_name_gsym != NULL
8274 && strcmp (comm_name_gsym->name,
8275 comm_block_tree->n.common->name) == 0)
8277 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8279 if (comm_name_gsym->binding_label == NULL)
8280 /* No binding label for common block stored yet; save this one. */
8281 comm_name_gsym->binding_label =
8282 comm_block_tree->n.common->binding_label;
8284 if (strcmp (comm_name_gsym->binding_label,
8285 comm_block_tree->n.common->binding_label) != 0)
8287 /* Common block names match but binding labels do not. */
8288 gfc_error ("Binding label '%s' for common block '%s' at %L "
8289 "does not match the binding label '%s' for common "
8291 comm_block_tree->n.common->binding_label,
8292 comm_block_tree->n.common->name,
8293 &(comm_block_tree->n.common->where),
8294 comm_name_gsym->binding_label,
8295 comm_name_gsym->name,
8296 &(comm_name_gsym->where));
8301 /* There is no binding label (NAME="") so we have nothing further to
8302 check and nothing to add as a global symbol for the label. */
8303 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8306 binding_label_gsym =
8307 gfc_find_gsymbol (gfc_gsym_root,
8308 comm_block_tree->n.common->binding_label);
8309 if (binding_label_gsym == NULL)
8311 /* Need to make a global symbol for the binding label to prevent
8312 it from colliding with another. */
8313 binding_label_gsym =
8314 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8315 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8316 binding_label_gsym->type = GSYM_COMMON;
8320 /* If comm_name_gsym is NULL, the name common block is use
8321 associated and the name could be colliding. */
8322 if (binding_label_gsym->type != GSYM_COMMON)
8323 gfc_error ("Binding label '%s' for common block '%s' at %L "
8324 "collides with the global entity '%s' at %L",
8325 comm_block_tree->n.common->binding_label,
8326 comm_block_tree->n.common->name,
8327 &(comm_block_tree->n.common->where),
8328 binding_label_gsym->name,
8329 &(binding_label_gsym->where));
8330 else if (comm_name_gsym != NULL
8331 && (strcmp (binding_label_gsym->name,
8332 comm_name_gsym->binding_label) != 0)
8333 && (strcmp (binding_label_gsym->sym_name,
8334 comm_name_gsym->name) != 0))
8335 gfc_error ("Binding label '%s' for common block '%s' at %L "
8336 "collides with global entity '%s' at %L",
8337 binding_label_gsym->name, binding_label_gsym->sym_name,
8338 &(comm_block_tree->n.common->where),
8339 comm_name_gsym->name, &(comm_name_gsym->where));
8347 /* Verify any BIND(C) derived types in the namespace so we can report errors
8348 for them once, rather than for each variable declared of that type. */
8351 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8353 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8354 && derived_sym->attr.is_bind_c == 1)
8355 verify_bind_c_derived_type (derived_sym);
8361 /* Verify that any binding labels used in a given namespace do not collide
8362 with the names or binding labels of any global symbols. */
8365 gfc_verify_binding_labels (gfc_symbol *sym)
8369 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8370 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8372 gfc_gsymbol *bind_c_sym;
8374 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8375 if (bind_c_sym != NULL
8376 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8378 if (sym->attr.if_source == IFSRC_DECL
8379 && (bind_c_sym->type != GSYM_SUBROUTINE
8380 && bind_c_sym->type != GSYM_FUNCTION)
8381 && ((sym->attr.contained == 1
8382 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8383 || (sym->attr.use_assoc == 1
8384 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8386 /* Make sure global procedures don't collide with anything. */
8387 gfc_error ("Binding label '%s' at %L collides with the global "
8388 "entity '%s' at %L", sym->binding_label,
8389 &(sym->declared_at), bind_c_sym->name,
8390 &(bind_c_sym->where));
8393 else if (sym->attr.contained == 0
8394 && (sym->attr.if_source == IFSRC_IFBODY
8395 && sym->attr.flavor == FL_PROCEDURE)
8396 && (bind_c_sym->sym_name != NULL
8397 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8399 /* Make sure procedures in interface bodies don't collide. */
8400 gfc_error ("Binding label '%s' in interface body at %L collides "
8401 "with the global entity '%s' at %L",
8403 &(sym->declared_at), bind_c_sym->name,
8404 &(bind_c_sym->where));
8407 else if (sym->attr.contained == 0
8408 && sym->attr.if_source == IFSRC_UNKNOWN)
8409 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8410 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8411 || sym->attr.use_assoc == 0)
8413 gfc_error ("Binding label '%s' at %L collides with global "
8414 "entity '%s' at %L", sym->binding_label,
8415 &(sym->declared_at), bind_c_sym->name,
8416 &(bind_c_sym->where));
8421 /* Clear the binding label to prevent checking multiple times. */
8422 sym->binding_label[0] = '\0';
8424 else if (bind_c_sym == NULL)
8426 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8427 bind_c_sym->where = sym->declared_at;
8428 bind_c_sym->sym_name = sym->name;
8430 if (sym->attr.use_assoc == 1)
8431 bind_c_sym->mod_name = sym->module;
8433 if (sym->ns->proc_name != NULL)
8434 bind_c_sym->mod_name = sym->ns->proc_name->name;
8436 if (sym->attr.contained == 0)
8438 if (sym->attr.subroutine)
8439 bind_c_sym->type = GSYM_SUBROUTINE;
8440 else if (sym->attr.function)
8441 bind_c_sym->type = GSYM_FUNCTION;
8449 /* Resolve an index expression. */
8452 resolve_index_expr (gfc_expr *e)
8454 if (gfc_resolve_expr (e) == FAILURE)
8457 if (gfc_simplify_expr (e, 0) == FAILURE)
8460 if (gfc_specification_expr (e) == FAILURE)
8466 /* Resolve a charlen structure. */
8469 resolve_charlen (gfc_charlen *cl)
8478 specification_expr = 1;
8480 if (resolve_index_expr (cl->length) == FAILURE)
8482 specification_expr = 0;
8486 /* "If the character length parameter value evaluates to a negative
8487 value, the length of character entities declared is zero." */
8488 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8490 gfc_warning_now ("CHARACTER variable has zero length at %L",
8491 &cl->length->where);
8492 gfc_replace_expr (cl->length, gfc_int_expr (0));
8495 /* Check that the character length is not too large. */
8496 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8497 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8498 && cl->length->ts.type == BT_INTEGER
8499 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8501 gfc_error ("String length at %L is too large", &cl->length->where);
8509 /* Test for non-constant shape arrays. */
8512 is_non_constant_shape_array (gfc_symbol *sym)
8518 not_constant = false;
8519 if (sym->as != NULL)
8521 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8522 has not been simplified; parameter array references. Do the
8523 simplification now. */
8524 for (i = 0; i < sym->as->rank; i++)
8526 e = sym->as->lower[i];
8527 if (e && (resolve_index_expr (e) == FAILURE
8528 || !gfc_is_constant_expr (e)))
8529 not_constant = true;
8531 e = sym->as->upper[i];
8532 if (e && (resolve_index_expr (e) == FAILURE
8533 || !gfc_is_constant_expr (e)))
8534 not_constant = true;
8537 return not_constant;
8540 /* Given a symbol and an initialization expression, add code to initialize
8541 the symbol to the function entry. */
8543 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8547 gfc_namespace *ns = sym->ns;
8549 /* Search for the function namespace if this is a contained
8550 function without an explicit result. */
8551 if (sym->attr.function && sym == sym->result
8552 && sym->name != sym->ns->proc_name->name)
8555 for (;ns; ns = ns->sibling)
8556 if (strcmp (ns->proc_name->name, sym->name) == 0)
8562 gfc_free_expr (init);
8566 /* Build an l-value expression for the result. */
8567 lval = gfc_lval_expr_from_sym (sym);
8569 /* Add the code at scope entry. */
8570 init_st = gfc_get_code ();
8571 init_st->next = ns->code;
8574 /* Assign the default initializer to the l-value. */
8575 init_st->loc = sym->declared_at;
8576 init_st->op = EXEC_INIT_ASSIGN;
8577 init_st->expr1 = lval;
8578 init_st->expr2 = init;
8581 /* Assign the default initializer to a derived type variable or result. */
8584 apply_default_init (gfc_symbol *sym)
8586 gfc_expr *init = NULL;
8588 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8591 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8592 init = gfc_default_initializer (&sym->ts);
8597 build_init_assign (sym, init);
8600 /* Build an initializer for a local integer, real, complex, logical, or
8601 character variable, based on the command line flags finit-local-zero,
8602 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8603 null if the symbol should not have a default initialization. */
8605 build_default_init_expr (gfc_symbol *sym)
8608 gfc_expr *init_expr;
8611 /* These symbols should never have a default initialization. */
8612 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8613 || sym->attr.external
8615 || sym->attr.pointer
8616 || sym->attr.in_equivalence
8617 || sym->attr.in_common
8620 || sym->attr.cray_pointee
8621 || sym->attr.cray_pointer)
8624 /* Now we'll try to build an initializer expression. */
8625 init_expr = gfc_get_expr ();
8626 init_expr->expr_type = EXPR_CONSTANT;
8627 init_expr->ts.type = sym->ts.type;
8628 init_expr->ts.kind = sym->ts.kind;
8629 init_expr->where = sym->declared_at;
8631 /* We will only initialize integers, reals, complex, logicals, and
8632 characters, and only if the corresponding command-line flags
8633 were set. Otherwise, we free init_expr and return null. */
8634 switch (sym->ts.type)
8637 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
8638 mpz_init_set_si (init_expr->value.integer,
8639 gfc_option.flag_init_integer_value);
8642 gfc_free_expr (init_expr);
8648 mpfr_init (init_expr->value.real);
8649 switch (gfc_option.flag_init_real)
8651 case GFC_INIT_REAL_SNAN:
8652 init_expr->is_snan = 1;
8654 case GFC_INIT_REAL_NAN:
8655 mpfr_set_nan (init_expr->value.real);
8658 case GFC_INIT_REAL_INF:
8659 mpfr_set_inf (init_expr->value.real, 1);
8662 case GFC_INIT_REAL_NEG_INF:
8663 mpfr_set_inf (init_expr->value.real, -1);
8666 case GFC_INIT_REAL_ZERO:
8667 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
8671 gfc_free_expr (init_expr);
8678 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
8679 switch (gfc_option.flag_init_real)
8681 case GFC_INIT_REAL_SNAN:
8682 init_expr->is_snan = 1;
8684 case GFC_INIT_REAL_NAN:
8685 mpfr_set_nan (mpc_realref (init_expr->value.complex));
8686 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
8689 case GFC_INIT_REAL_INF:
8690 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
8691 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
8694 case GFC_INIT_REAL_NEG_INF:
8695 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
8696 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
8699 case GFC_INIT_REAL_ZERO:
8700 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
8704 gfc_free_expr (init_expr);
8711 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
8712 init_expr->value.logical = 0;
8713 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
8714 init_expr->value.logical = 1;
8717 gfc_free_expr (init_expr);
8723 /* For characters, the length must be constant in order to
8724 create a default initializer. */
8725 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
8726 && sym->ts.u.cl->length
8727 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8729 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
8730 init_expr->value.character.length = char_len;
8731 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
8732 for (i = 0; i < char_len; i++)
8733 init_expr->value.character.string[i]
8734 = (unsigned char) gfc_option.flag_init_character_value;
8738 gfc_free_expr (init_expr);
8744 gfc_free_expr (init_expr);
8750 /* Add an initialization expression to a local variable. */
8752 apply_default_init_local (gfc_symbol *sym)
8754 gfc_expr *init = NULL;
8756 /* The symbol should be a variable or a function return value. */
8757 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8758 || (sym->attr.function && sym->result != sym))
8761 /* Try to build the initializer expression. If we can't initialize
8762 this symbol, then init will be NULL. */
8763 init = build_default_init_expr (sym);
8767 /* For saved variables, we don't want to add an initializer at
8768 function entry, so we just add a static initializer. */
8769 if (sym->attr.save || sym->ns->save_all
8770 || gfc_option.flag_max_stack_var_size == 0)
8772 /* Don't clobber an existing initializer! */
8773 gcc_assert (sym->value == NULL);
8778 build_init_assign (sym, init);
8781 /* Resolution of common features of flavors variable and procedure. */
8784 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
8786 /* Constraints on deferred shape variable. */
8787 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
8789 if (sym->attr.allocatable)
8791 if (sym->attr.dimension)
8793 gfc_error ("Allocatable array '%s' at %L must have "
8794 "a deferred shape", sym->name, &sym->declared_at);
8797 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
8798 "may not be ALLOCATABLE", sym->name,
8799 &sym->declared_at) == FAILURE)
8803 if (sym->attr.pointer && sym->attr.dimension)
8805 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
8806 sym->name, &sym->declared_at);
8813 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
8814 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
8816 gfc_error ("Array '%s' at %L cannot have a deferred shape",
8817 sym->name, &sym->declared_at);
8825 /* Additional checks for symbols with flavor variable and derived
8826 type. To be called from resolve_fl_variable. */
8829 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
8831 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
8833 /* Check to see if a derived type is blocked from being host
8834 associated by the presence of another class I symbol in the same
8835 namespace. 14.6.1.3 of the standard and the discussion on
8836 comp.lang.fortran. */
8837 if (sym->ns != sym->ts.u.derived->ns
8838 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
8841 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
8842 if (s && s->attr.flavor != FL_DERIVED)
8844 gfc_error ("The type '%s' cannot be host associated at %L "
8845 "because it is blocked by an incompatible object "
8846 "of the same name declared at %L",
8847 sym->ts.u.derived->name, &sym->declared_at,
8853 /* 4th constraint in section 11.3: "If an object of a type for which
8854 component-initialization is specified (R429) appears in the
8855 specification-part of a module and does not have the ALLOCATABLE
8856 or POINTER attribute, the object shall have the SAVE attribute."
8858 The check for initializers is performed with
8859 has_default_initializer because gfc_default_initializer generates
8860 a hidden default for allocatable components. */
8861 if (!(sym->value || no_init_flag) && sym->ns->proc_name
8862 && sym->ns->proc_name->attr.flavor == FL_MODULE
8863 && !sym->ns->save_all && !sym->attr.save
8864 && !sym->attr.pointer && !sym->attr.allocatable
8865 && has_default_initializer (sym->ts.u.derived))
8867 gfc_error("Object '%s' at %L must have the SAVE attribute for "
8868 "default initialization of a component",
8869 sym->name, &sym->declared_at);
8873 if (sym->ts.type == BT_CLASS)
8876 if (!gfc_type_is_extensible (sym->ts.u.derived->components->ts.u.derived))
8878 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
8879 sym->ts.u.derived->components->ts.u.derived->name,
8880 sym->name, &sym->declared_at);
8885 /* Assume that use associated symbols were checked in the module ns. */
8886 if (!sym->attr.class_ok && !sym->attr.use_assoc)
8888 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
8889 "or pointer", sym->name, &sym->declared_at);
8894 /* Assign default initializer. */
8895 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
8896 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
8898 sym->value = gfc_default_initializer (&sym->ts);
8905 /* Resolve symbols with flavor variable. */
8908 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
8910 int no_init_flag, automatic_flag;
8912 const char *auto_save_msg;
8914 auto_save_msg = "Automatic object '%s' at %L cannot have the "
8917 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
8920 /* Set this flag to check that variables are parameters of all entries.
8921 This check is effected by the call to gfc_resolve_expr through
8922 is_non_constant_shape_array. */
8923 specification_expr = 1;
8925 if (sym->ns->proc_name
8926 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8927 || sym->ns->proc_name->attr.is_main_program)
8928 && !sym->attr.use_assoc
8929 && !sym->attr.allocatable
8930 && !sym->attr.pointer
8931 && is_non_constant_shape_array (sym))
8933 /* The shape of a main program or module array needs to be
8935 gfc_error ("The module or main program array '%s' at %L must "
8936 "have constant shape", sym->name, &sym->declared_at);
8937 specification_expr = 0;
8941 if (sym->ts.type == BT_CHARACTER)
8943 /* Make sure that character string variables with assumed length are
8945 e = sym->ts.u.cl->length;
8946 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
8948 gfc_error ("Entity with assumed character length at %L must be a "
8949 "dummy argument or a PARAMETER", &sym->declared_at);
8953 if (e && sym->attr.save && !gfc_is_constant_expr (e))
8955 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8959 if (!gfc_is_constant_expr (e)
8960 && !(e->expr_type == EXPR_VARIABLE
8961 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
8962 && sym->ns->proc_name
8963 && (sym->ns->proc_name->attr.flavor == FL_MODULE
8964 || sym->ns->proc_name->attr.is_main_program)
8965 && !sym->attr.use_assoc)
8967 gfc_error ("'%s' at %L must have constant character length "
8968 "in this context", sym->name, &sym->declared_at);
8973 if (sym->value == NULL && sym->attr.referenced)
8974 apply_default_init_local (sym); /* Try to apply a default initialization. */
8976 /* Determine if the symbol may not have an initializer. */
8977 no_init_flag = automatic_flag = 0;
8978 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
8979 || sym->attr.intrinsic || sym->attr.result)
8981 else if (sym->attr.dimension && !sym->attr.pointer
8982 && is_non_constant_shape_array (sym))
8984 no_init_flag = automatic_flag = 1;
8986 /* Also, they must not have the SAVE attribute.
8987 SAVE_IMPLICIT is checked below. */
8988 if (sym->attr.save == SAVE_EXPLICIT)
8990 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
8995 /* Ensure that any initializer is simplified. */
8997 gfc_simplify_expr (sym->value, 1);
8999 /* Reject illegal initializers. */
9000 if (!sym->mark && sym->value)
9002 if (sym->attr.allocatable)
9003 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9004 sym->name, &sym->declared_at);
9005 else if (sym->attr.external)
9006 gfc_error ("External '%s' at %L cannot have an initializer",
9007 sym->name, &sym->declared_at);
9008 else if (sym->attr.dummy
9009 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9010 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9011 sym->name, &sym->declared_at);
9012 else if (sym->attr.intrinsic)
9013 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9014 sym->name, &sym->declared_at);
9015 else if (sym->attr.result)
9016 gfc_error ("Function result '%s' at %L cannot have an initializer",
9017 sym->name, &sym->declared_at);
9018 else if (automatic_flag)
9019 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9020 sym->name, &sym->declared_at);
9027 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9028 return resolve_fl_variable_derived (sym, no_init_flag);
9034 /* Resolve a procedure. */
9037 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9039 gfc_formal_arglist *arg;
9041 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
9042 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
9043 "interfaces", sym->name, &sym->declared_at);
9045 if (sym->attr.function
9046 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9049 if (sym->ts.type == BT_CHARACTER)
9051 gfc_charlen *cl = sym->ts.u.cl;
9053 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9054 && resolve_charlen (cl) == FAILURE)
9057 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9058 && sym->attr.proc == PROC_ST_FUNCTION)
9060 gfc_error ("Character-valued statement function '%s' at %L must "
9061 "have constant length", sym->name, &sym->declared_at);
9066 /* Ensure that derived type for are not of a private type. Internal
9067 module procedures are excluded by 2.2.3.3 - i.e., they are not
9068 externally accessible and can access all the objects accessible in
9070 if (!(sym->ns->parent
9071 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9072 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9074 gfc_interface *iface;
9076 for (arg = sym->formal; arg; arg = arg->next)
9079 && arg->sym->ts.type == BT_DERIVED
9080 && !arg->sym->ts.u.derived->attr.use_assoc
9081 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9082 arg->sym->ts.u.derived->ns->default_access)
9083 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9084 "PRIVATE type and cannot be a dummy argument"
9085 " of '%s', which is PUBLIC at %L",
9086 arg->sym->name, sym->name, &sym->declared_at)
9089 /* Stop this message from recurring. */
9090 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9095 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9096 PRIVATE to the containing module. */
9097 for (iface = sym->generic; iface; iface = iface->next)
9099 for (arg = iface->sym->formal; arg; arg = arg->next)
9102 && arg->sym->ts.type == BT_DERIVED
9103 && !arg->sym->ts.u.derived->attr.use_assoc
9104 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9105 arg->sym->ts.u.derived->ns->default_access)
9106 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9107 "'%s' in PUBLIC interface '%s' at %L "
9108 "takes dummy arguments of '%s' which is "
9109 "PRIVATE", iface->sym->name, sym->name,
9110 &iface->sym->declared_at,
9111 gfc_typename (&arg->sym->ts)) == FAILURE)
9113 /* Stop this message from recurring. */
9114 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9120 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9121 PRIVATE to the containing module. */
9122 for (iface = sym->generic; iface; iface = iface->next)
9124 for (arg = iface->sym->formal; arg; arg = arg->next)
9127 && arg->sym->ts.type == BT_DERIVED
9128 && !arg->sym->ts.u.derived->attr.use_assoc
9129 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9130 arg->sym->ts.u.derived->ns->default_access)
9131 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9132 "'%s' in PUBLIC interface '%s' at %L "
9133 "takes dummy arguments of '%s' which is "
9134 "PRIVATE", iface->sym->name, sym->name,
9135 &iface->sym->declared_at,
9136 gfc_typename (&arg->sym->ts)) == FAILURE)
9138 /* Stop this message from recurring. */
9139 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9146 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9147 && !sym->attr.proc_pointer)
9149 gfc_error ("Function '%s' at %L cannot have an initializer",
9150 sym->name, &sym->declared_at);
9154 /* An external symbol may not have an initializer because it is taken to be
9155 a procedure. Exception: Procedure Pointers. */
9156 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9158 gfc_error ("External object '%s' at %L may not have an initializer",
9159 sym->name, &sym->declared_at);
9163 /* An elemental function is required to return a scalar 12.7.1 */
9164 if (sym->attr.elemental && sym->attr.function && sym->as)
9166 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9167 "result", sym->name, &sym->declared_at);
9168 /* Reset so that the error only occurs once. */
9169 sym->attr.elemental = 0;
9173 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9174 char-len-param shall not be array-valued, pointer-valued, recursive
9175 or pure. ....snip... A character value of * may only be used in the
9176 following ways: (i) Dummy arg of procedure - dummy associates with
9177 actual length; (ii) To declare a named constant; or (iii) External
9178 function - but length must be declared in calling scoping unit. */
9179 if (sym->attr.function
9180 && sym->ts.type == BT_CHARACTER
9181 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9183 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9184 || (sym->attr.recursive) || (sym->attr.pure))
9186 if (sym->as && sym->as->rank)
9187 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9188 "array-valued", sym->name, &sym->declared_at);
9190 if (sym->attr.pointer)
9191 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9192 "pointer-valued", sym->name, &sym->declared_at);
9195 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9196 "pure", sym->name, &sym->declared_at);
9198 if (sym->attr.recursive)
9199 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9200 "recursive", sym->name, &sym->declared_at);
9205 /* Appendix B.2 of the standard. Contained functions give an
9206 error anyway. Fixed-form is likely to be F77/legacy. */
9207 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9208 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9209 "CHARACTER(*) function '%s' at %L",
9210 sym->name, &sym->declared_at);
9213 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9215 gfc_formal_arglist *curr_arg;
9216 int has_non_interop_arg = 0;
9218 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9219 sym->common_block) == FAILURE)
9221 /* Clear these to prevent looking at them again if there was an
9223 sym->attr.is_bind_c = 0;
9224 sym->attr.is_c_interop = 0;
9225 sym->ts.is_c_interop = 0;
9229 /* So far, no errors have been found. */
9230 sym->attr.is_c_interop = 1;
9231 sym->ts.is_c_interop = 1;
9234 curr_arg = sym->formal;
9235 while (curr_arg != NULL)
9237 /* Skip implicitly typed dummy args here. */
9238 if (curr_arg->sym->attr.implicit_type == 0)
9239 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9240 /* If something is found to fail, record the fact so we
9241 can mark the symbol for the procedure as not being
9242 BIND(C) to try and prevent multiple errors being
9244 has_non_interop_arg = 1;
9246 curr_arg = curr_arg->next;
9249 /* See if any of the arguments were not interoperable and if so, clear
9250 the procedure symbol to prevent duplicate error messages. */
9251 if (has_non_interop_arg != 0)
9253 sym->attr.is_c_interop = 0;
9254 sym->ts.is_c_interop = 0;
9255 sym->attr.is_bind_c = 0;
9259 if (!sym->attr.proc_pointer)
9261 if (sym->attr.save == SAVE_EXPLICIT)
9263 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9264 "in '%s' at %L", sym->name, &sym->declared_at);
9267 if (sym->attr.intent)
9269 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9270 "in '%s' at %L", sym->name, &sym->declared_at);
9273 if (sym->attr.subroutine && sym->attr.result)
9275 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9276 "in '%s' at %L", sym->name, &sym->declared_at);
9279 if (sym->attr.external && sym->attr.function
9280 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9281 || sym->attr.contained))
9283 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9284 "in '%s' at %L", sym->name, &sym->declared_at);
9287 if (strcmp ("ppr@", sym->name) == 0)
9289 gfc_error ("Procedure pointer result '%s' at %L "
9290 "is missing the pointer attribute",
9291 sym->ns->proc_name->name, &sym->declared_at);
9300 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9301 been defined and we now know their defined arguments, check that they fulfill
9302 the requirements of the standard for procedures used as finalizers. */
9305 gfc_resolve_finalizers (gfc_symbol* derived)
9307 gfc_finalizer* list;
9308 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9309 gfc_try result = SUCCESS;
9310 bool seen_scalar = false;
9312 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9315 /* Walk over the list of finalizer-procedures, check them, and if any one
9316 does not fit in with the standard's definition, print an error and remove
9317 it from the list. */
9318 prev_link = &derived->f2k_derived->finalizers;
9319 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9325 /* Skip this finalizer if we already resolved it. */
9326 if (list->proc_tree)
9328 prev_link = &(list->next);
9332 /* Check this exists and is a SUBROUTINE. */
9333 if (!list->proc_sym->attr.subroutine)
9335 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9336 list->proc_sym->name, &list->where);
9340 /* We should have exactly one argument. */
9341 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9343 gfc_error ("FINAL procedure at %L must have exactly one argument",
9347 arg = list->proc_sym->formal->sym;
9349 /* This argument must be of our type. */
9350 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9352 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9353 &arg->declared_at, derived->name);
9357 /* It must neither be a pointer nor allocatable nor optional. */
9358 if (arg->attr.pointer)
9360 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9364 if (arg->attr.allocatable)
9366 gfc_error ("Argument of FINAL procedure at %L must not be"
9367 " ALLOCATABLE", &arg->declared_at);
9370 if (arg->attr.optional)
9372 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9377 /* It must not be INTENT(OUT). */
9378 if (arg->attr.intent == INTENT_OUT)
9380 gfc_error ("Argument of FINAL procedure at %L must not be"
9381 " INTENT(OUT)", &arg->declared_at);
9385 /* Warn if the procedure is non-scalar and not assumed shape. */
9386 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9387 && arg->as->type != AS_ASSUMED_SHAPE)
9388 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9389 " shape argument", &arg->declared_at);
9391 /* Check that it does not match in kind and rank with a FINAL procedure
9392 defined earlier. To really loop over the *earlier* declarations,
9393 we need to walk the tail of the list as new ones were pushed at the
9395 /* TODO: Handle kind parameters once they are implemented. */
9396 my_rank = (arg->as ? arg->as->rank : 0);
9397 for (i = list->next; i; i = i->next)
9399 /* Argument list might be empty; that is an error signalled earlier,
9400 but we nevertheless continued resolving. */
9401 if (i->proc_sym->formal)
9403 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9404 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9405 if (i_rank == my_rank)
9407 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9408 " rank (%d) as '%s'",
9409 list->proc_sym->name, &list->where, my_rank,
9416 /* Is this the/a scalar finalizer procedure? */
9417 if (!arg->as || arg->as->rank == 0)
9420 /* Find the symtree for this procedure. */
9421 gcc_assert (!list->proc_tree);
9422 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9424 prev_link = &list->next;
9427 /* Remove wrong nodes immediately from the list so we don't risk any
9428 troubles in the future when they might fail later expectations. */
9432 *prev_link = list->next;
9433 gfc_free_finalizer (i);
9436 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9437 were nodes in the list, must have been for arrays. It is surely a good
9438 idea to have a scalar version there if there's something to finalize. */
9439 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9440 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9441 " defined at %L, suggest also scalar one",
9442 derived->name, &derived->declared_at);
9444 /* TODO: Remove this error when finalization is finished. */
9445 gfc_error ("Finalization at %L is not yet implemented",
9446 &derived->declared_at);
9452 /* Check that it is ok for the typebound procedure proc to override the
9456 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9459 const gfc_symbol* proc_target;
9460 const gfc_symbol* old_target;
9461 unsigned proc_pass_arg, old_pass_arg, argpos;
9462 gfc_formal_arglist* proc_formal;
9463 gfc_formal_arglist* old_formal;
9465 /* This procedure should only be called for non-GENERIC proc. */
9466 gcc_assert (!proc->n.tb->is_generic);
9468 /* If the overwritten procedure is GENERIC, this is an error. */
9469 if (old->n.tb->is_generic)
9471 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9472 old->name, &proc->n.tb->where);
9476 where = proc->n.tb->where;
9477 proc_target = proc->n.tb->u.specific->n.sym;
9478 old_target = old->n.tb->u.specific->n.sym;
9480 /* Check that overridden binding is not NON_OVERRIDABLE. */
9481 if (old->n.tb->non_overridable)
9483 gfc_error ("'%s' at %L overrides a procedure binding declared"
9484 " NON_OVERRIDABLE", proc->name, &where);
9488 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9489 if (!old->n.tb->deferred && proc->n.tb->deferred)
9491 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9492 " non-DEFERRED binding", proc->name, &where);
9496 /* If the overridden binding is PURE, the overriding must be, too. */
9497 if (old_target->attr.pure && !proc_target->attr.pure)
9499 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9500 proc->name, &where);
9504 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9505 is not, the overriding must not be either. */
9506 if (old_target->attr.elemental && !proc_target->attr.elemental)
9508 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9509 " ELEMENTAL", proc->name, &where);
9512 if (!old_target->attr.elemental && proc_target->attr.elemental)
9514 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9515 " be ELEMENTAL, either", proc->name, &where);
9519 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9521 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9523 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9524 " SUBROUTINE", proc->name, &where);
9528 /* If the overridden binding is a FUNCTION, the overriding must also be a
9529 FUNCTION and have the same characteristics. */
9530 if (old_target->attr.function)
9532 if (!proc_target->attr.function)
9534 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9535 " FUNCTION", proc->name, &where);
9539 /* FIXME: Do more comprehensive checking (including, for instance, the
9540 rank and array-shape). */
9541 gcc_assert (proc_target->result && old_target->result);
9542 if (!gfc_compare_types (&proc_target->result->ts,
9543 &old_target->result->ts))
9545 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9546 " matching result types", proc->name, &where);
9551 /* If the overridden binding is PUBLIC, the overriding one must not be
9553 if (old->n.tb->access == ACCESS_PUBLIC
9554 && proc->n.tb->access == ACCESS_PRIVATE)
9556 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9557 " PRIVATE", proc->name, &where);
9561 /* Compare the formal argument lists of both procedures. This is also abused
9562 to find the position of the passed-object dummy arguments of both
9563 bindings as at least the overridden one might not yet be resolved and we
9564 need those positions in the check below. */
9565 proc_pass_arg = old_pass_arg = 0;
9566 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9568 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9571 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9572 proc_formal && old_formal;
9573 proc_formal = proc_formal->next, old_formal = old_formal->next)
9575 if (proc->n.tb->pass_arg
9576 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9577 proc_pass_arg = argpos;
9578 if (old->n.tb->pass_arg
9579 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9580 old_pass_arg = argpos;
9582 /* Check that the names correspond. */
9583 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9585 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9586 " to match the corresponding argument of the overridden"
9587 " procedure", proc_formal->sym->name, proc->name, &where,
9588 old_formal->sym->name);
9592 /* Check that the types correspond if neither is the passed-object
9594 /* FIXME: Do more comprehensive testing here. */
9595 if (proc_pass_arg != argpos && old_pass_arg != argpos
9596 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9598 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9599 "in respect to the overridden procedure",
9600 proc_formal->sym->name, proc->name, &where);
9606 if (proc_formal || old_formal)
9608 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9609 " the overridden procedure", proc->name, &where);
9613 /* If the overridden binding is NOPASS, the overriding one must also be
9615 if (old->n.tb->nopass && !proc->n.tb->nopass)
9617 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9618 " NOPASS", proc->name, &where);
9622 /* If the overridden binding is PASS(x), the overriding one must also be
9623 PASS and the passed-object dummy arguments must correspond. */
9624 if (!old->n.tb->nopass)
9626 if (proc->n.tb->nopass)
9628 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
9629 " PASS", proc->name, &where);
9633 if (proc_pass_arg != old_pass_arg)
9635 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
9636 " the same position as the passed-object dummy argument of"
9637 " the overridden procedure", proc->name, &where);
9646 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
9649 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
9650 const char* generic_name, locus where)
9655 gcc_assert (t1->specific && t2->specific);
9656 gcc_assert (!t1->specific->is_generic);
9657 gcc_assert (!t2->specific->is_generic);
9659 sym1 = t1->specific->u.specific->n.sym;
9660 sym2 = t2->specific->u.specific->n.sym;
9665 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
9666 if (sym1->attr.subroutine != sym2->attr.subroutine
9667 || sym1->attr.function != sym2->attr.function)
9669 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
9670 " GENERIC '%s' at %L",
9671 sym1->name, sym2->name, generic_name, &where);
9675 /* Compare the interfaces. */
9676 if (gfc_compare_interfaces (sym1, sym2, NULL, 1, 0, NULL, 0))
9678 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
9679 sym1->name, sym2->name, generic_name, &where);
9687 /* Worker function for resolving a generic procedure binding; this is used to
9688 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
9690 The difference between those cases is finding possible inherited bindings
9691 that are overridden, as one has to look for them in tb_sym_root,
9692 tb_uop_root or tb_op, respectively. Thus the caller must already find
9693 the super-type and set p->overridden correctly. */
9696 resolve_tb_generic_targets (gfc_symbol* super_type,
9697 gfc_typebound_proc* p, const char* name)
9699 gfc_tbp_generic* target;
9700 gfc_symtree* first_target;
9701 gfc_symtree* inherited;
9703 gcc_assert (p && p->is_generic);
9705 /* Try to find the specific bindings for the symtrees in our target-list. */
9706 gcc_assert (p->u.generic);
9707 for (target = p->u.generic; target; target = target->next)
9708 if (!target->specific)
9710 gfc_typebound_proc* overridden_tbp;
9712 const char* target_name;
9714 target_name = target->specific_st->name;
9716 /* Defined for this type directly. */
9717 if (target->specific_st->n.tb)
9719 target->specific = target->specific_st->n.tb;
9720 goto specific_found;
9723 /* Look for an inherited specific binding. */
9726 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
9731 gcc_assert (inherited->n.tb);
9732 target->specific = inherited->n.tb;
9733 goto specific_found;
9737 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
9738 " at %L", target_name, name, &p->where);
9741 /* Once we've found the specific binding, check it is not ambiguous with
9742 other specifics already found or inherited for the same GENERIC. */
9744 gcc_assert (target->specific);
9746 /* This must really be a specific binding! */
9747 if (target->specific->is_generic)
9749 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
9750 " '%s' is GENERIC, too", name, &p->where, target_name);
9754 /* Check those already resolved on this type directly. */
9755 for (g = p->u.generic; g; g = g->next)
9756 if (g != target && g->specific
9757 && check_generic_tbp_ambiguity (target, g, name, p->where)
9761 /* Check for ambiguity with inherited specific targets. */
9762 for (overridden_tbp = p->overridden; overridden_tbp;
9763 overridden_tbp = overridden_tbp->overridden)
9764 if (overridden_tbp->is_generic)
9766 for (g = overridden_tbp->u.generic; g; g = g->next)
9768 gcc_assert (g->specific);
9769 if (check_generic_tbp_ambiguity (target, g,
9770 name, p->where) == FAILURE)
9776 /* If we attempt to "overwrite" a specific binding, this is an error. */
9777 if (p->overridden && !p->overridden->is_generic)
9779 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
9780 " the same name", name, &p->where);
9784 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
9785 all must have the same attributes here. */
9786 first_target = p->u.generic->specific->u.specific;
9787 gcc_assert (first_target);
9788 p->subroutine = first_target->n.sym->attr.subroutine;
9789 p->function = first_target->n.sym->attr.function;
9795 /* Resolve a GENERIC procedure binding for a derived type. */
9798 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
9800 gfc_symbol* super_type;
9802 /* Find the overridden binding if any. */
9803 st->n.tb->overridden = NULL;
9804 super_type = gfc_get_derived_super_type (derived);
9807 gfc_symtree* overridden;
9808 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
9811 if (overridden && overridden->n.tb)
9812 st->n.tb->overridden = overridden->n.tb;
9815 /* Resolve using worker function. */
9816 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
9820 /* Retrieve the target-procedure of an operator binding and do some checks in
9821 common for intrinsic and user-defined type-bound operators. */
9824 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
9826 gfc_symbol* target_proc;
9828 gcc_assert (target->specific && !target->specific->is_generic);
9829 target_proc = target->specific->u.specific->n.sym;
9830 gcc_assert (target_proc);
9832 /* All operator bindings must have a passed-object dummy argument. */
9833 if (target->specific->nopass)
9835 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
9843 /* Resolve a type-bound intrinsic operator. */
9846 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
9847 gfc_typebound_proc* p)
9849 gfc_symbol* super_type;
9850 gfc_tbp_generic* target;
9852 /* If there's already an error here, do nothing (but don't fail again). */
9856 /* Operators should always be GENERIC bindings. */
9857 gcc_assert (p->is_generic);
9859 /* Look for an overridden binding. */
9860 super_type = gfc_get_derived_super_type (derived);
9861 if (super_type && super_type->f2k_derived)
9862 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
9865 p->overridden = NULL;
9867 /* Resolve general GENERIC properties using worker function. */
9868 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
9871 /* Check the targets to be procedures of correct interface. */
9872 for (target = p->u.generic; target; target = target->next)
9874 gfc_symbol* target_proc;
9876 target_proc = get_checked_tb_operator_target (target, p->where);
9880 if (!gfc_check_operator_interface (target_proc, op, p->where))
9892 /* Resolve a type-bound user operator (tree-walker callback). */
9894 static gfc_symbol* resolve_bindings_derived;
9895 static gfc_try resolve_bindings_result;
9897 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
9900 resolve_typebound_user_op (gfc_symtree* stree)
9902 gfc_symbol* super_type;
9903 gfc_tbp_generic* target;
9905 gcc_assert (stree && stree->n.tb);
9907 if (stree->n.tb->error)
9910 /* Operators should always be GENERIC bindings. */
9911 gcc_assert (stree->n.tb->is_generic);
9913 /* Find overridden procedure, if any. */
9914 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
9915 if (super_type && super_type->f2k_derived)
9917 gfc_symtree* overridden;
9918 overridden = gfc_find_typebound_user_op (super_type, NULL,
9919 stree->name, true, NULL);
9921 if (overridden && overridden->n.tb)
9922 stree->n.tb->overridden = overridden->n.tb;
9925 stree->n.tb->overridden = NULL;
9927 /* Resolve basically using worker function. */
9928 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
9932 /* Check the targets to be functions of correct interface. */
9933 for (target = stree->n.tb->u.generic; target; target = target->next)
9935 gfc_symbol* target_proc;
9937 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
9941 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
9948 resolve_bindings_result = FAILURE;
9949 stree->n.tb->error = 1;
9953 /* Resolve the type-bound procedures for a derived type. */
9956 resolve_typebound_procedure (gfc_symtree* stree)
9961 gfc_symbol* super_type;
9962 gfc_component* comp;
9966 /* Undefined specific symbol from GENERIC target definition. */
9970 if (stree->n.tb->error)
9973 /* If this is a GENERIC binding, use that routine. */
9974 if (stree->n.tb->is_generic)
9976 if (resolve_typebound_generic (resolve_bindings_derived, stree)
9982 /* Get the target-procedure to check it. */
9983 gcc_assert (!stree->n.tb->is_generic);
9984 gcc_assert (stree->n.tb->u.specific);
9985 proc = stree->n.tb->u.specific->n.sym;
9986 where = stree->n.tb->where;
9988 /* Default access should already be resolved from the parser. */
9989 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
9991 /* It should be a module procedure or an external procedure with explicit
9992 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
9993 if ((!proc->attr.subroutine && !proc->attr.function)
9994 || (proc->attr.proc != PROC_MODULE
9995 && proc->attr.if_source != IFSRC_IFBODY)
9996 || (proc->attr.abstract && !stree->n.tb->deferred))
9998 gfc_error ("'%s' must be a module procedure or an external procedure with"
9999 " an explicit interface at %L", proc->name, &where);
10002 stree->n.tb->subroutine = proc->attr.subroutine;
10003 stree->n.tb->function = proc->attr.function;
10005 /* Find the super-type of the current derived type. We could do this once and
10006 store in a global if speed is needed, but as long as not I believe this is
10007 more readable and clearer. */
10008 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10010 /* If PASS, resolve and check arguments if not already resolved / loaded
10011 from a .mod file. */
10012 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10014 if (stree->n.tb->pass_arg)
10016 gfc_formal_arglist* i;
10018 /* If an explicit passing argument name is given, walk the arg-list
10019 and look for it. */
10022 stree->n.tb->pass_arg_num = 1;
10023 for (i = proc->formal; i; i = i->next)
10025 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10030 ++stree->n.tb->pass_arg_num;
10035 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10037 proc->name, stree->n.tb->pass_arg, &where,
10038 stree->n.tb->pass_arg);
10044 /* Otherwise, take the first one; there should in fact be at least
10046 stree->n.tb->pass_arg_num = 1;
10049 gfc_error ("Procedure '%s' with PASS at %L must have at"
10050 " least one argument", proc->name, &where);
10053 me_arg = proc->formal->sym;
10056 /* Now check that the argument-type matches and the passed-object
10057 dummy argument is generally fine. */
10059 gcc_assert (me_arg);
10061 if (me_arg->ts.type != BT_CLASS)
10063 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10064 " at %L", proc->name, &where);
10068 if (me_arg->ts.u.derived->components->ts.u.derived
10069 != resolve_bindings_derived)
10071 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10072 " the derived-type '%s'", me_arg->name, proc->name,
10073 me_arg->name, &where, resolve_bindings_derived->name);
10077 gcc_assert (me_arg->ts.type == BT_CLASS);
10078 if (me_arg->ts.u.derived->components->as
10079 && me_arg->ts.u.derived->components->as->rank > 0)
10081 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10082 " scalar", proc->name, &where);
10085 if (me_arg->ts.u.derived->components->attr.allocatable)
10087 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10088 " be ALLOCATABLE", proc->name, &where);
10091 if (me_arg->ts.u.derived->components->attr.class_pointer)
10093 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10094 " be POINTER", proc->name, &where);
10099 /* If we are extending some type, check that we don't override a procedure
10100 flagged NON_OVERRIDABLE. */
10101 stree->n.tb->overridden = NULL;
10104 gfc_symtree* overridden;
10105 overridden = gfc_find_typebound_proc (super_type, NULL,
10106 stree->name, true, NULL);
10108 if (overridden && overridden->n.tb)
10109 stree->n.tb->overridden = overridden->n.tb;
10111 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10115 /* See if there's a name collision with a component directly in this type. */
10116 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10117 if (!strcmp (comp->name, stree->name))
10119 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10121 stree->name, &where, resolve_bindings_derived->name);
10125 /* Try to find a name collision with an inherited component. */
10126 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10128 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10129 " component of '%s'",
10130 stree->name, &where, resolve_bindings_derived->name);
10134 stree->n.tb->error = 0;
10138 resolve_bindings_result = FAILURE;
10139 stree->n.tb->error = 1;
10143 resolve_typebound_procedures (gfc_symbol* derived)
10147 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10150 resolve_bindings_derived = derived;
10151 resolve_bindings_result = SUCCESS;
10153 if (derived->f2k_derived->tb_sym_root)
10154 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10155 &resolve_typebound_procedure);
10157 if (derived->f2k_derived->tb_uop_root)
10158 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10159 &resolve_typebound_user_op);
10161 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10163 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10164 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10166 resolve_bindings_result = FAILURE;
10169 return resolve_bindings_result;
10173 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10174 to give all identical derived types the same backend_decl. */
10176 add_dt_to_dt_list (gfc_symbol *derived)
10178 gfc_dt_list *dt_list;
10180 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10181 if (derived == dt_list->derived)
10184 if (dt_list == NULL)
10186 dt_list = gfc_get_dt_list ();
10187 dt_list->next = gfc_derived_types;
10188 dt_list->derived = derived;
10189 gfc_derived_types = dt_list;
10194 /* Ensure that a derived-type is really not abstract, meaning that every
10195 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10198 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10203 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10205 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10208 if (st->n.tb && st->n.tb->deferred)
10210 gfc_symtree* overriding;
10211 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10212 gcc_assert (overriding && overriding->n.tb);
10213 if (overriding->n.tb->deferred)
10215 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10216 " '%s' is DEFERRED and not overridden",
10217 sub->name, &sub->declared_at, st->name);
10226 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10228 /* The algorithm used here is to recursively travel up the ancestry of sub
10229 and for each ancestor-type, check all bindings. If any of them is
10230 DEFERRED, look it up starting from sub and see if the found (overriding)
10231 binding is not DEFERRED.
10232 This is not the most efficient way to do this, but it should be ok and is
10233 clearer than something sophisticated. */
10235 gcc_assert (ancestor && ancestor->attr.abstract && !sub->attr.abstract);
10237 /* Walk bindings of this ancestor. */
10238 if (ancestor->f2k_derived)
10241 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10246 /* Find next ancestor type and recurse on it. */
10247 ancestor = gfc_get_derived_super_type (ancestor);
10249 return ensure_not_abstract (sub, ancestor);
10255 static void resolve_symbol (gfc_symbol *sym);
10258 /* Resolve the components of a derived type. */
10261 resolve_fl_derived (gfc_symbol *sym)
10263 gfc_symbol* super_type;
10267 super_type = gfc_get_derived_super_type (sym);
10269 /* Ensure the extended type gets resolved before we do. */
10270 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10273 /* An ABSTRACT type must be extensible. */
10274 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10276 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10277 sym->name, &sym->declared_at);
10281 for (c = sym->components; c != NULL; c = c->next)
10283 if (c->attr.proc_pointer && c->ts.interface)
10285 if (c->ts.interface->attr.procedure)
10286 gfc_error ("Interface '%s', used by procedure pointer component "
10287 "'%s' at %L, is declared in a later PROCEDURE statement",
10288 c->ts.interface->name, c->name, &c->loc);
10290 /* Get the attributes from the interface (now resolved). */
10291 if (c->ts.interface->attr.if_source
10292 || c->ts.interface->attr.intrinsic)
10294 gfc_symbol *ifc = c->ts.interface;
10296 if (ifc->formal && !ifc->formal_ns)
10297 resolve_symbol (ifc);
10299 if (ifc->attr.intrinsic)
10300 resolve_intrinsic (ifc, &ifc->declared_at);
10304 c->ts = ifc->result->ts;
10305 c->attr.allocatable = ifc->result->attr.allocatable;
10306 c->attr.pointer = ifc->result->attr.pointer;
10307 c->attr.dimension = ifc->result->attr.dimension;
10308 c->as = gfc_copy_array_spec (ifc->result->as);
10313 c->attr.allocatable = ifc->attr.allocatable;
10314 c->attr.pointer = ifc->attr.pointer;
10315 c->attr.dimension = ifc->attr.dimension;
10316 c->as = gfc_copy_array_spec (ifc->as);
10318 c->ts.interface = ifc;
10319 c->attr.function = ifc->attr.function;
10320 c->attr.subroutine = ifc->attr.subroutine;
10321 gfc_copy_formal_args_ppc (c, ifc);
10323 c->attr.pure = ifc->attr.pure;
10324 c->attr.elemental = ifc->attr.elemental;
10325 c->attr.recursive = ifc->attr.recursive;
10326 c->attr.always_explicit = ifc->attr.always_explicit;
10327 c->attr.ext_attr |= ifc->attr.ext_attr;
10328 /* Replace symbols in array spec. */
10332 for (i = 0; i < c->as->rank; i++)
10334 gfc_expr_replace_comp (c->as->lower[i], c);
10335 gfc_expr_replace_comp (c->as->upper[i], c);
10338 /* Copy char length. */
10339 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10341 c->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10342 gfc_expr_replace_comp (c->ts.u.cl->length, c);
10345 else if (c->ts.interface->name[0] != '\0')
10347 gfc_error ("Interface '%s' of procedure pointer component "
10348 "'%s' at %L must be explicit", c->ts.interface->name,
10353 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10355 /* Since PPCs are not implicitly typed, a PPC without an explicit
10356 interface must be a subroutine. */
10357 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10360 /* Procedure pointer components: Check PASS arg. */
10361 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0)
10363 gfc_symbol* me_arg;
10365 if (c->tb->pass_arg)
10367 gfc_formal_arglist* i;
10369 /* If an explicit passing argument name is given, walk the arg-list
10370 and look for it. */
10373 c->tb->pass_arg_num = 1;
10374 for (i = c->formal; i; i = i->next)
10376 if (!strcmp (i->sym->name, c->tb->pass_arg))
10381 c->tb->pass_arg_num++;
10386 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10387 "at %L has no argument '%s'", c->name,
10388 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10395 /* Otherwise, take the first one; there should in fact be at least
10397 c->tb->pass_arg_num = 1;
10400 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10401 "must have at least one argument",
10406 me_arg = c->formal->sym;
10409 /* Now check that the argument-type matches. */
10410 gcc_assert (me_arg);
10411 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10412 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10413 || (me_arg->ts.type == BT_CLASS
10414 && me_arg->ts.u.derived->components->ts.u.derived != sym))
10416 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10417 " the derived type '%s'", me_arg->name, c->name,
10418 me_arg->name, &c->loc, sym->name);
10423 /* Check for C453. */
10424 if (me_arg->attr.dimension)
10426 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10427 "must be scalar", me_arg->name, c->name, me_arg->name,
10433 if (me_arg->attr.pointer)
10435 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10436 "may not have the POINTER attribute", me_arg->name,
10437 c->name, me_arg->name, &c->loc);
10442 if (me_arg->attr.allocatable)
10444 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10445 "may not be ALLOCATABLE", me_arg->name, c->name,
10446 me_arg->name, &c->loc);
10451 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10452 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10453 " at %L", c->name, &c->loc);
10457 /* Check type-spec if this is not the parent-type component. */
10458 if ((!sym->attr.extension || c != sym->components)
10459 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10462 /* If this type is an extension, see if this component has the same name
10463 as an inherited type-bound procedure. */
10465 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10467 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10468 " inherited type-bound procedure",
10469 c->name, sym->name, &c->loc);
10473 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10475 if (c->ts.u.cl->length == NULL
10476 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10477 || !gfc_is_constant_expr (c->ts.u.cl->length))
10479 gfc_error ("Character length of component '%s' needs to "
10480 "be a constant specification expression at %L",
10482 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10487 if (c->ts.type == BT_DERIVED
10488 && sym->component_access != ACCESS_PRIVATE
10489 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10490 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10491 && !c->ts.u.derived->attr.use_assoc
10492 && !gfc_check_access (c->ts.u.derived->attr.access,
10493 c->ts.u.derived->ns->default_access)
10494 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10495 "is a PRIVATE type and cannot be a component of "
10496 "'%s', which is PUBLIC at %L", c->name,
10497 sym->name, &sym->declared_at) == FAILURE)
10500 if (sym->attr.sequence)
10502 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10504 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10505 "not have the SEQUENCE attribute",
10506 c->ts.u.derived->name, &sym->declared_at);
10511 if (c->ts.type == BT_DERIVED && c->attr.pointer
10512 && c->ts.u.derived->components == NULL
10513 && !c->ts.u.derived->attr.zero_comp)
10515 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10516 "that has not been declared", c->name, sym->name,
10522 if (c->ts.type == BT_CLASS
10523 && !(c->ts.u.derived->components->attr.pointer
10524 || c->ts.u.derived->components->attr.allocatable))
10526 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10527 "or pointer", c->name, &c->loc);
10531 /* Ensure that all the derived type components are put on the
10532 derived type list; even in formal namespaces, where derived type
10533 pointer components might not have been declared. */
10534 if (c->ts.type == BT_DERIVED
10536 && c->ts.u.derived->components
10538 && sym != c->ts.u.derived)
10539 add_dt_to_dt_list (c->ts.u.derived);
10541 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
10545 for (i = 0; i < c->as->rank; i++)
10547 if (c->as->lower[i] == NULL
10548 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
10549 || !gfc_is_constant_expr (c->as->lower[i])
10550 || c->as->upper[i] == NULL
10551 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
10552 || !gfc_is_constant_expr (c->as->upper[i]))
10554 gfc_error ("Component '%s' of '%s' at %L must have "
10555 "constant array bounds",
10556 c->name, sym->name, &c->loc);
10562 /* Resolve the type-bound procedures. */
10563 if (resolve_typebound_procedures (sym) == FAILURE)
10566 /* Resolve the finalizer procedures. */
10567 if (gfc_resolve_finalizers (sym) == FAILURE)
10570 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
10571 all DEFERRED bindings are overridden. */
10572 if (super_type && super_type->attr.abstract && !sym->attr.abstract
10573 && ensure_not_abstract (sym, super_type) == FAILURE)
10576 /* Add derived type to the derived type list. */
10577 add_dt_to_dt_list (sym);
10584 resolve_fl_namelist (gfc_symbol *sym)
10589 /* Reject PRIVATE objects in a PUBLIC namelist. */
10590 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
10592 for (nl = sym->namelist; nl; nl = nl->next)
10594 if (!nl->sym->attr.use_assoc
10595 && !is_sym_host_assoc (nl->sym, sym->ns)
10596 && !gfc_check_access(nl->sym->attr.access,
10597 nl->sym->ns->default_access))
10599 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
10600 "cannot be member of PUBLIC namelist '%s' at %L",
10601 nl->sym->name, sym->name, &sym->declared_at);
10605 /* Types with private components that came here by USE-association. */
10606 if (nl->sym->ts.type == BT_DERIVED
10607 && derived_inaccessible (nl->sym->ts.u.derived))
10609 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
10610 "components and cannot be member of namelist '%s' at %L",
10611 nl->sym->name, sym->name, &sym->declared_at);
10615 /* Types with private components that are defined in the same module. */
10616 if (nl->sym->ts.type == BT_DERIVED
10617 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
10618 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
10619 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
10620 nl->sym->ns->default_access))
10622 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
10623 "cannot be a member of PUBLIC namelist '%s' at %L",
10624 nl->sym->name, sym->name, &sym->declared_at);
10630 for (nl = sym->namelist; nl; nl = nl->next)
10632 /* Reject namelist arrays of assumed shape. */
10633 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
10634 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
10635 "must not have assumed shape in namelist "
10636 "'%s' at %L", nl->sym->name, sym->name,
10637 &sym->declared_at) == FAILURE)
10640 /* Reject namelist arrays that are not constant shape. */
10641 if (is_non_constant_shape_array (nl->sym))
10643 gfc_error ("NAMELIST array object '%s' must have constant "
10644 "shape in namelist '%s' at %L", nl->sym->name,
10645 sym->name, &sym->declared_at);
10649 /* Namelist objects cannot have allocatable or pointer components. */
10650 if (nl->sym->ts.type != BT_DERIVED)
10653 if (nl->sym->ts.u.derived->attr.alloc_comp)
10655 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10656 "have ALLOCATABLE components",
10657 nl->sym->name, sym->name, &sym->declared_at);
10661 if (nl->sym->ts.u.derived->attr.pointer_comp)
10663 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
10664 "have POINTER components",
10665 nl->sym->name, sym->name, &sym->declared_at);
10671 /* 14.1.2 A module or internal procedure represent local entities
10672 of the same type as a namelist member and so are not allowed. */
10673 for (nl = sym->namelist; nl; nl = nl->next)
10675 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
10678 if (nl->sym->attr.function && nl->sym == nl->sym->result)
10679 if ((nl->sym == sym->ns->proc_name)
10681 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
10685 if (nl->sym && nl->sym->name)
10686 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
10687 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
10689 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
10690 "attribute in '%s' at %L", nlsym->name,
10691 &sym->declared_at);
10701 resolve_fl_parameter (gfc_symbol *sym)
10703 /* A parameter array's shape needs to be constant. */
10704 if (sym->as != NULL
10705 && (sym->as->type == AS_DEFERRED
10706 || is_non_constant_shape_array (sym)))
10708 gfc_error ("Parameter array '%s' at %L cannot be automatic "
10709 "or of deferred shape", sym->name, &sym->declared_at);
10713 /* Make sure a parameter that has been implicitly typed still
10714 matches the implicit type, since PARAMETER statements can precede
10715 IMPLICIT statements. */
10716 if (sym->attr.implicit_type
10717 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
10720 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
10721 "later IMPLICIT type", sym->name, &sym->declared_at);
10725 /* Make sure the types of derived parameters are consistent. This
10726 type checking is deferred until resolution because the type may
10727 refer to a derived type from the host. */
10728 if (sym->ts.type == BT_DERIVED
10729 && !gfc_compare_types (&sym->ts, &sym->value->ts))
10731 gfc_error ("Incompatible derived type in PARAMETER at %L",
10732 &sym->value->where);
10739 /* Do anything necessary to resolve a symbol. Right now, we just
10740 assume that an otherwise unknown symbol is a variable. This sort
10741 of thing commonly happens for symbols in module. */
10744 resolve_symbol (gfc_symbol *sym)
10746 int check_constant, mp_flag;
10747 gfc_symtree *symtree;
10748 gfc_symtree *this_symtree;
10752 if (sym->attr.flavor == FL_UNKNOWN)
10755 /* If we find that a flavorless symbol is an interface in one of the
10756 parent namespaces, find its symtree in this namespace, free the
10757 symbol and set the symtree to point to the interface symbol. */
10758 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
10760 symtree = gfc_find_symtree (ns->sym_root, sym->name);
10761 if (symtree && symtree->n.sym->generic)
10763 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
10767 gfc_free_symbol (sym);
10768 symtree->n.sym->refs++;
10769 this_symtree->n.sym = symtree->n.sym;
10774 /* Otherwise give it a flavor according to such attributes as
10776 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
10777 sym->attr.flavor = FL_VARIABLE;
10780 sym->attr.flavor = FL_PROCEDURE;
10781 if (sym->attr.dimension)
10782 sym->attr.function = 1;
10786 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
10787 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
10789 if (sym->attr.procedure && sym->ts.interface
10790 && sym->attr.if_source != IFSRC_DECL)
10792 if (sym->ts.interface == sym)
10794 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
10795 "interface", sym->name, &sym->declared_at);
10798 if (sym->ts.interface->attr.procedure)
10800 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
10801 " in a later PROCEDURE statement", sym->ts.interface->name,
10802 sym->name,&sym->declared_at);
10806 /* Get the attributes from the interface (now resolved). */
10807 if (sym->ts.interface->attr.if_source
10808 || sym->ts.interface->attr.intrinsic)
10810 gfc_symbol *ifc = sym->ts.interface;
10811 resolve_symbol (ifc);
10813 if (ifc->attr.intrinsic)
10814 resolve_intrinsic (ifc, &ifc->declared_at);
10817 sym->ts = ifc->result->ts;
10820 sym->ts.interface = ifc;
10821 sym->attr.function = ifc->attr.function;
10822 sym->attr.subroutine = ifc->attr.subroutine;
10823 gfc_copy_formal_args (sym, ifc);
10825 sym->attr.allocatable = ifc->attr.allocatable;
10826 sym->attr.pointer = ifc->attr.pointer;
10827 sym->attr.pure = ifc->attr.pure;
10828 sym->attr.elemental = ifc->attr.elemental;
10829 sym->attr.dimension = ifc->attr.dimension;
10830 sym->attr.recursive = ifc->attr.recursive;
10831 sym->attr.always_explicit = ifc->attr.always_explicit;
10832 sym->attr.ext_attr |= ifc->attr.ext_attr;
10833 /* Copy array spec. */
10834 sym->as = gfc_copy_array_spec (ifc->as);
10838 for (i = 0; i < sym->as->rank; i++)
10840 gfc_expr_replace_symbols (sym->as->lower[i], sym);
10841 gfc_expr_replace_symbols (sym->as->upper[i], sym);
10844 /* Copy char length. */
10845 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10847 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10848 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
10851 else if (sym->ts.interface->name[0] != '\0')
10853 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
10854 sym->ts.interface->name, sym->name, &sym->declared_at);
10859 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
10862 /* Symbols that are module procedures with results (functions) have
10863 the types and array specification copied for type checking in
10864 procedures that call them, as well as for saving to a module
10865 file. These symbols can't stand the scrutiny that their results
10867 mp_flag = (sym->result != NULL && sym->result != sym);
10870 /* Make sure that the intrinsic is consistent with its internal
10871 representation. This needs to be done before assigning a default
10872 type to avoid spurious warnings. */
10873 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
10874 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
10877 /* Assign default type to symbols that need one and don't have one. */
10878 if (sym->ts.type == BT_UNKNOWN)
10880 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
10881 gfc_set_default_type (sym, 1, NULL);
10883 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
10884 && !sym->attr.function && !sym->attr.subroutine
10885 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
10886 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
10888 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
10890 /* The specific case of an external procedure should emit an error
10891 in the case that there is no implicit type. */
10893 gfc_set_default_type (sym, sym->attr.external, NULL);
10896 /* Result may be in another namespace. */
10897 resolve_symbol (sym->result);
10899 if (!sym->result->attr.proc_pointer)
10901 sym->ts = sym->result->ts;
10902 sym->as = gfc_copy_array_spec (sym->result->as);
10903 sym->attr.dimension = sym->result->attr.dimension;
10904 sym->attr.pointer = sym->result->attr.pointer;
10905 sym->attr.allocatable = sym->result->attr.allocatable;
10911 /* Assumed size arrays and assumed shape arrays must be dummy
10914 if (sym->as != NULL
10915 && (sym->as->type == AS_ASSUMED_SIZE
10916 || sym->as->type == AS_ASSUMED_SHAPE)
10917 && sym->attr.dummy == 0)
10919 if (sym->as->type == AS_ASSUMED_SIZE)
10920 gfc_error ("Assumed size array at %L must be a dummy argument",
10921 &sym->declared_at);
10923 gfc_error ("Assumed shape array at %L must be a dummy argument",
10924 &sym->declared_at);
10928 /* Make sure symbols with known intent or optional are really dummy
10929 variable. Because of ENTRY statement, this has to be deferred
10930 until resolution time. */
10932 if (!sym->attr.dummy
10933 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
10935 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
10939 if (sym->attr.value && !sym->attr.dummy)
10941 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
10942 "it is not a dummy argument", sym->name, &sym->declared_at);
10946 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
10948 gfc_charlen *cl = sym->ts.u.cl;
10949 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10951 gfc_error ("Character dummy variable '%s' at %L with VALUE "
10952 "attribute must have constant length",
10953 sym->name, &sym->declared_at);
10957 if (sym->ts.is_c_interop
10958 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
10960 gfc_error ("C interoperable character dummy variable '%s' at %L "
10961 "with VALUE attribute must have length one",
10962 sym->name, &sym->declared_at);
10967 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
10968 do this for something that was implicitly typed because that is handled
10969 in gfc_set_default_type. Handle dummy arguments and procedure
10970 definitions separately. Also, anything that is use associated is not
10971 handled here but instead is handled in the module it is declared in.
10972 Finally, derived type definitions are allowed to be BIND(C) since that
10973 only implies that they're interoperable, and they are checked fully for
10974 interoperability when a variable is declared of that type. */
10975 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
10976 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
10977 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
10979 gfc_try t = SUCCESS;
10981 /* First, make sure the variable is declared at the
10982 module-level scope (J3/04-007, Section 15.3). */
10983 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
10984 sym->attr.in_common == 0)
10986 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
10987 "is neither a COMMON block nor declared at the "
10988 "module level scope", sym->name, &(sym->declared_at));
10991 else if (sym->common_head != NULL)
10993 t = verify_com_block_vars_c_interop (sym->common_head);
10997 /* If type() declaration, we need to verify that the components
10998 of the given type are all C interoperable, etc. */
10999 if (sym->ts.type == BT_DERIVED &&
11000 sym->ts.u.derived->attr.is_c_interop != 1)
11002 /* Make sure the user marked the derived type as BIND(C). If
11003 not, call the verify routine. This could print an error
11004 for the derived type more than once if multiple variables
11005 of that type are declared. */
11006 if (sym->ts.u.derived->attr.is_bind_c != 1)
11007 verify_bind_c_derived_type (sym->ts.u.derived);
11011 /* Verify the variable itself as C interoperable if it
11012 is BIND(C). It is not possible for this to succeed if
11013 the verify_bind_c_derived_type failed, so don't have to handle
11014 any error returned by verify_bind_c_derived_type. */
11015 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11016 sym->common_block);
11021 /* clear the is_bind_c flag to prevent reporting errors more than
11022 once if something failed. */
11023 sym->attr.is_bind_c = 0;
11028 /* If a derived type symbol has reached this point, without its
11029 type being declared, we have an error. Notice that most
11030 conditions that produce undefined derived types have already
11031 been dealt with. However, the likes of:
11032 implicit type(t) (t) ..... call foo (t) will get us here if
11033 the type is not declared in the scope of the implicit
11034 statement. Change the type to BT_UNKNOWN, both because it is so
11035 and to prevent an ICE. */
11036 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11037 && !sym->ts.u.derived->attr.zero_comp)
11039 gfc_error ("The derived type '%s' at %L is of type '%s', "
11040 "which has not been defined", sym->name,
11041 &sym->declared_at, sym->ts.u.derived->name);
11042 sym->ts.type = BT_UNKNOWN;
11046 /* Make sure that the derived type has been resolved and that the
11047 derived type is visible in the symbol's namespace, if it is a
11048 module function and is not PRIVATE. */
11049 if (sym->ts.type == BT_DERIVED
11050 && sym->ts.u.derived->attr.use_assoc
11051 && sym->ns->proc_name
11052 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11056 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11059 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11060 if (!ds && sym->attr.function
11061 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11063 symtree = gfc_new_symtree (&sym->ns->sym_root,
11064 sym->ts.u.derived->name);
11065 symtree->n.sym = sym->ts.u.derived;
11066 sym->ts.u.derived->refs++;
11070 /* Unless the derived-type declaration is use associated, Fortran 95
11071 does not allow public entries of private derived types.
11072 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11073 161 in 95-006r3. */
11074 if (sym->ts.type == BT_DERIVED
11075 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11076 && !sym->ts.u.derived->attr.use_assoc
11077 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11078 && !gfc_check_access (sym->ts.u.derived->attr.access,
11079 sym->ts.u.derived->ns->default_access)
11080 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11081 "of PRIVATE derived type '%s'",
11082 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11083 : "variable", sym->name, &sym->declared_at,
11084 sym->ts.u.derived->name) == FAILURE)
11087 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11088 default initialization is defined (5.1.2.4.4). */
11089 if (sym->ts.type == BT_DERIVED
11091 && sym->attr.intent == INTENT_OUT
11093 && sym->as->type == AS_ASSUMED_SIZE)
11095 for (c = sym->ts.u.derived->components; c; c = c->next)
11097 if (c->initializer)
11099 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11100 "ASSUMED SIZE and so cannot have a default initializer",
11101 sym->name, &sym->declared_at);
11107 switch (sym->attr.flavor)
11110 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11115 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11120 if (resolve_fl_namelist (sym) == FAILURE)
11125 if (resolve_fl_parameter (sym) == FAILURE)
11133 /* Resolve array specifier. Check as well some constraints
11134 on COMMON blocks. */
11136 check_constant = sym->attr.in_common && !sym->attr.pointer;
11138 /* Set the formal_arg_flag so that check_conflict will not throw
11139 an error for host associated variables in the specification
11140 expression for an array_valued function. */
11141 if (sym->attr.function && sym->as)
11142 formal_arg_flag = 1;
11144 gfc_resolve_array_spec (sym->as, check_constant);
11146 formal_arg_flag = 0;
11148 /* Resolve formal namespaces. */
11149 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11150 && !sym->attr.contained && !sym->attr.intrinsic)
11151 gfc_resolve (sym->formal_ns);
11153 /* Make sure the formal namespace is present. */
11154 if (sym->formal && !sym->formal_ns)
11156 gfc_formal_arglist *formal = sym->formal;
11157 while (formal && !formal->sym)
11158 formal = formal->next;
11162 sym->formal_ns = formal->sym->ns;
11163 sym->formal_ns->refs++;
11167 /* Check threadprivate restrictions. */
11168 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11169 && (!sym->attr.in_common
11170 && sym->module == NULL
11171 && (sym->ns->proc_name == NULL
11172 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11173 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11175 /* If we have come this far we can apply default-initializers, as
11176 described in 14.7.5, to those variables that have not already
11177 been assigned one. */
11178 if (sym->ts.type == BT_DERIVED
11179 && sym->attr.referenced
11180 && sym->ns == gfc_current_ns
11182 && !sym->attr.allocatable
11183 && !sym->attr.alloc_comp)
11185 symbol_attribute *a = &sym->attr;
11187 if ((!a->save && !a->dummy && !a->pointer
11188 && !a->in_common && !a->use_assoc
11189 && !(a->function && sym != sym->result))
11190 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11191 apply_default_init (sym);
11194 /* If this symbol has a type-spec, check it. */
11195 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11196 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11197 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11203 /************* Resolve DATA statements *************/
11207 gfc_data_value *vnode;
11213 /* Advance the values structure to point to the next value in the data list. */
11216 next_data_value (void)
11218 while (mpz_cmp_ui (values.left, 0) == 0)
11221 if (values.vnode->next == NULL)
11224 values.vnode = values.vnode->next;
11225 mpz_set (values.left, values.vnode->repeat);
11233 check_data_variable (gfc_data_variable *var, locus *where)
11239 ar_type mark = AR_UNKNOWN;
11241 mpz_t section_index[GFC_MAX_DIMENSIONS];
11247 if (gfc_resolve_expr (var->expr) == FAILURE)
11251 mpz_init_set_si (offset, 0);
11254 if (e->expr_type != EXPR_VARIABLE)
11255 gfc_internal_error ("check_data_variable(): Bad expression");
11257 sym = e->symtree->n.sym;
11259 if (sym->ns->is_block_data && !sym->attr.in_common)
11261 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11262 sym->name, &sym->declared_at);
11265 if (e->ref == NULL && sym->as)
11267 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11268 " declaration", sym->name, where);
11272 has_pointer = sym->attr.pointer;
11274 for (ref = e->ref; ref; ref = ref->next)
11276 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11280 && ref->type == REF_ARRAY
11281 && ref->u.ar.type != AR_FULL)
11283 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11284 "be a full array", sym->name, where);
11289 if (e->rank == 0 || has_pointer)
11291 mpz_init_set_ui (size, 1);
11298 /* Find the array section reference. */
11299 for (ref = e->ref; ref; ref = ref->next)
11301 if (ref->type != REF_ARRAY)
11303 if (ref->u.ar.type == AR_ELEMENT)
11309 /* Set marks according to the reference pattern. */
11310 switch (ref->u.ar.type)
11318 /* Get the start position of array section. */
11319 gfc_get_section_index (ar, section_index, &offset);
11324 gcc_unreachable ();
11327 if (gfc_array_size (e, &size) == FAILURE)
11329 gfc_error ("Nonconstant array section at %L in DATA statement",
11331 mpz_clear (offset);
11338 while (mpz_cmp_ui (size, 0) > 0)
11340 if (next_data_value () == FAILURE)
11342 gfc_error ("DATA statement at %L has more variables than values",
11348 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11352 /* If we have more than one element left in the repeat count,
11353 and we have more than one element left in the target variable,
11354 then create a range assignment. */
11355 /* FIXME: Only done for full arrays for now, since array sections
11357 if (mark == AR_FULL && ref && ref->next == NULL
11358 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11362 if (mpz_cmp (size, values.left) >= 0)
11364 mpz_init_set (range, values.left);
11365 mpz_sub (size, size, values.left);
11366 mpz_set_ui (values.left, 0);
11370 mpz_init_set (range, size);
11371 mpz_sub (values.left, values.left, size);
11372 mpz_set_ui (size, 0);
11375 gfc_assign_data_value_range (var->expr, values.vnode->expr,
11378 mpz_add (offset, offset, range);
11382 /* Assign initial value to symbol. */
11385 mpz_sub_ui (values.left, values.left, 1);
11386 mpz_sub_ui (size, size, 1);
11388 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11392 if (mark == AR_FULL)
11393 mpz_add_ui (offset, offset, 1);
11395 /* Modify the array section indexes and recalculate the offset
11396 for next element. */
11397 else if (mark == AR_SECTION)
11398 gfc_advance_section (section_index, ar, &offset);
11402 if (mark == AR_SECTION)
11404 for (i = 0; i < ar->dimen; i++)
11405 mpz_clear (section_index[i]);
11409 mpz_clear (offset);
11415 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11417 /* Iterate over a list of elements in a DATA statement. */
11420 traverse_data_list (gfc_data_variable *var, locus *where)
11423 iterator_stack frame;
11424 gfc_expr *e, *start, *end, *step;
11425 gfc_try retval = SUCCESS;
11427 mpz_init (frame.value);
11429 start = gfc_copy_expr (var->iter.start);
11430 end = gfc_copy_expr (var->iter.end);
11431 step = gfc_copy_expr (var->iter.step);
11433 if (gfc_simplify_expr (start, 1) == FAILURE
11434 || start->expr_type != EXPR_CONSTANT)
11436 gfc_error ("iterator start at %L does not simplify", &start->where);
11440 if (gfc_simplify_expr (end, 1) == FAILURE
11441 || end->expr_type != EXPR_CONSTANT)
11443 gfc_error ("iterator end at %L does not simplify", &end->where);
11447 if (gfc_simplify_expr (step, 1) == FAILURE
11448 || step->expr_type != EXPR_CONSTANT)
11450 gfc_error ("iterator step at %L does not simplify", &step->where);
11455 mpz_init_set (trip, end->value.integer);
11456 mpz_sub (trip, trip, start->value.integer);
11457 mpz_add (trip, trip, step->value.integer);
11459 mpz_div (trip, trip, step->value.integer);
11461 mpz_set (frame.value, start->value.integer);
11463 frame.prev = iter_stack;
11464 frame.variable = var->iter.var->symtree;
11465 iter_stack = &frame;
11467 while (mpz_cmp_ui (trip, 0) > 0)
11469 if (traverse_data_var (var->list, where) == FAILURE)
11476 e = gfc_copy_expr (var->expr);
11477 if (gfc_simplify_expr (e, 1) == FAILURE)
11485 mpz_add (frame.value, frame.value, step->value.integer);
11487 mpz_sub_ui (trip, trip, 1);
11492 mpz_clear (frame.value);
11494 gfc_free_expr (start);
11495 gfc_free_expr (end);
11496 gfc_free_expr (step);
11498 iter_stack = frame.prev;
11503 /* Type resolve variables in the variable list of a DATA statement. */
11506 traverse_data_var (gfc_data_variable *var, locus *where)
11510 for (; var; var = var->next)
11512 if (var->expr == NULL)
11513 t = traverse_data_list (var, where);
11515 t = check_data_variable (var, where);
11525 /* Resolve the expressions and iterators associated with a data statement.
11526 This is separate from the assignment checking because data lists should
11527 only be resolved once. */
11530 resolve_data_variables (gfc_data_variable *d)
11532 for (; d; d = d->next)
11534 if (d->list == NULL)
11536 if (gfc_resolve_expr (d->expr) == FAILURE)
11541 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
11544 if (resolve_data_variables (d->list) == FAILURE)
11553 /* Resolve a single DATA statement. We implement this by storing a pointer to
11554 the value list into static variables, and then recursively traversing the
11555 variables list, expanding iterators and such. */
11558 resolve_data (gfc_data *d)
11561 if (resolve_data_variables (d->var) == FAILURE)
11564 values.vnode = d->value;
11565 if (d->value == NULL)
11566 mpz_set_ui (values.left, 0);
11568 mpz_set (values.left, d->value->repeat);
11570 if (traverse_data_var (d->var, &d->where) == FAILURE)
11573 /* At this point, we better not have any values left. */
11575 if (next_data_value () == SUCCESS)
11576 gfc_error ("DATA statement at %L has more values than variables",
11581 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
11582 accessed by host or use association, is a dummy argument to a pure function,
11583 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
11584 is storage associated with any such variable, shall not be used in the
11585 following contexts: (clients of this function). */
11587 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
11588 procedure. Returns zero if assignment is OK, nonzero if there is a
11591 gfc_impure_variable (gfc_symbol *sym)
11595 if (sym->attr.use_assoc || sym->attr.in_common)
11598 if (sym->ns != gfc_current_ns)
11599 return !sym->attr.function;
11601 proc = sym->ns->proc_name;
11602 if (sym->attr.dummy && gfc_pure (proc)
11603 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
11605 proc->attr.function))
11608 /* TODO: Sort out what can be storage associated, if anything, and include
11609 it here. In principle equivalences should be scanned but it does not
11610 seem to be possible to storage associate an impure variable this way. */
11615 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
11616 symbol of the current procedure. */
11619 gfc_pure (gfc_symbol *sym)
11621 symbol_attribute attr;
11624 sym = gfc_current_ns->proc_name;
11630 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
11634 /* Test whether the current procedure is elemental or not. */
11637 gfc_elemental (gfc_symbol *sym)
11639 symbol_attribute attr;
11642 sym = gfc_current_ns->proc_name;
11647 return attr.flavor == FL_PROCEDURE && attr.elemental;
11651 /* Warn about unused labels. */
11654 warn_unused_fortran_label (gfc_st_label *label)
11659 warn_unused_fortran_label (label->left);
11661 if (label->defined == ST_LABEL_UNKNOWN)
11664 switch (label->referenced)
11666 case ST_LABEL_UNKNOWN:
11667 gfc_warning ("Label %d at %L defined but not used", label->value,
11671 case ST_LABEL_BAD_TARGET:
11672 gfc_warning ("Label %d at %L defined but cannot be used",
11673 label->value, &label->where);
11680 warn_unused_fortran_label (label->right);
11684 /* Returns the sequence type of a symbol or sequence. */
11687 sequence_type (gfc_typespec ts)
11696 if (ts.u.derived->components == NULL)
11697 return SEQ_NONDEFAULT;
11699 result = sequence_type (ts.u.derived->components->ts);
11700 for (c = ts.u.derived->components->next; c; c = c->next)
11701 if (sequence_type (c->ts) != result)
11707 if (ts.kind != gfc_default_character_kind)
11708 return SEQ_NONDEFAULT;
11710 return SEQ_CHARACTER;
11713 if (ts.kind != gfc_default_integer_kind)
11714 return SEQ_NONDEFAULT;
11716 return SEQ_NUMERIC;
11719 if (!(ts.kind == gfc_default_real_kind
11720 || ts.kind == gfc_default_double_kind))
11721 return SEQ_NONDEFAULT;
11723 return SEQ_NUMERIC;
11726 if (ts.kind != gfc_default_complex_kind)
11727 return SEQ_NONDEFAULT;
11729 return SEQ_NUMERIC;
11732 if (ts.kind != gfc_default_logical_kind)
11733 return SEQ_NONDEFAULT;
11735 return SEQ_NUMERIC;
11738 return SEQ_NONDEFAULT;
11743 /* Resolve derived type EQUIVALENCE object. */
11746 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
11748 gfc_component *c = derived->components;
11753 /* Shall not be an object of nonsequence derived type. */
11754 if (!derived->attr.sequence)
11756 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
11757 "attribute to be an EQUIVALENCE object", sym->name,
11762 /* Shall not have allocatable components. */
11763 if (derived->attr.alloc_comp)
11765 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
11766 "components to be an EQUIVALENCE object",sym->name,
11771 if (sym->attr.in_common && has_default_initializer (sym->ts.u.derived))
11773 gfc_error ("Derived type variable '%s' at %L with default "
11774 "initialization cannot be in EQUIVALENCE with a variable "
11775 "in COMMON", sym->name, &e->where);
11779 for (; c ; c = c->next)
11781 if (c->ts.type == BT_DERIVED
11782 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
11785 /* Shall not be an object of sequence derived type containing a pointer
11786 in the structure. */
11787 if (c->attr.pointer)
11789 gfc_error ("Derived type variable '%s' at %L with pointer "
11790 "component(s) cannot be an EQUIVALENCE object",
11791 sym->name, &e->where);
11799 /* Resolve equivalence object.
11800 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
11801 an allocatable array, an object of nonsequence derived type, an object of
11802 sequence derived type containing a pointer at any level of component
11803 selection, an automatic object, a function name, an entry name, a result
11804 name, a named constant, a structure component, or a subobject of any of
11805 the preceding objects. A substring shall not have length zero. A
11806 derived type shall not have components with default initialization nor
11807 shall two objects of an equivalence group be initialized.
11808 Either all or none of the objects shall have an protected attribute.
11809 The simple constraints are done in symbol.c(check_conflict) and the rest
11810 are implemented here. */
11813 resolve_equivalence (gfc_equiv *eq)
11816 gfc_symbol *first_sym;
11819 locus *last_where = NULL;
11820 seq_type eq_type, last_eq_type;
11821 gfc_typespec *last_ts;
11822 int object, cnt_protected;
11825 last_ts = &eq->expr->symtree->n.sym->ts;
11827 first_sym = eq->expr->symtree->n.sym;
11831 for (object = 1; eq; eq = eq->eq, object++)
11835 e->ts = e->symtree->n.sym->ts;
11836 /* match_varspec might not know yet if it is seeing
11837 array reference or substring reference, as it doesn't
11839 if (e->ref && e->ref->type == REF_ARRAY)
11841 gfc_ref *ref = e->ref;
11842 sym = e->symtree->n.sym;
11844 if (sym->attr.dimension)
11846 ref->u.ar.as = sym->as;
11850 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
11851 if (e->ts.type == BT_CHARACTER
11853 && ref->type == REF_ARRAY
11854 && ref->u.ar.dimen == 1
11855 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
11856 && ref->u.ar.stride[0] == NULL)
11858 gfc_expr *start = ref->u.ar.start[0];
11859 gfc_expr *end = ref->u.ar.end[0];
11862 /* Optimize away the (:) reference. */
11863 if (start == NULL && end == NULL)
11866 e->ref = ref->next;
11868 e->ref->next = ref->next;
11873 ref->type = REF_SUBSTRING;
11875 start = gfc_int_expr (1);
11876 ref->u.ss.start = start;
11877 if (end == NULL && e->ts.u.cl)
11878 end = gfc_copy_expr (e->ts.u.cl->length);
11879 ref->u.ss.end = end;
11880 ref->u.ss.length = e->ts.u.cl;
11887 /* Any further ref is an error. */
11890 gcc_assert (ref->type == REF_ARRAY);
11891 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
11897 if (gfc_resolve_expr (e) == FAILURE)
11900 sym = e->symtree->n.sym;
11902 if (sym->attr.is_protected)
11904 if (cnt_protected > 0 && cnt_protected != object)
11906 gfc_error ("Either all or none of the objects in the "
11907 "EQUIVALENCE set at %L shall have the "
11908 "PROTECTED attribute",
11913 /* Shall not equivalence common block variables in a PURE procedure. */
11914 if (sym->ns->proc_name
11915 && sym->ns->proc_name->attr.pure
11916 && sym->attr.in_common)
11918 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
11919 "object in the pure procedure '%s'",
11920 sym->name, &e->where, sym->ns->proc_name->name);
11924 /* Shall not be a named constant. */
11925 if (e->expr_type == EXPR_CONSTANT)
11927 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
11928 "object", sym->name, &e->where);
11932 if (e->ts.type == BT_DERIVED
11933 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
11936 /* Check that the types correspond correctly:
11938 A numeric sequence structure may be equivalenced to another sequence
11939 structure, an object of default integer type, default real type, double
11940 precision real type, default logical type such that components of the
11941 structure ultimately only become associated to objects of the same
11942 kind. A character sequence structure may be equivalenced to an object
11943 of default character kind or another character sequence structure.
11944 Other objects may be equivalenced only to objects of the same type and
11945 kind parameters. */
11947 /* Identical types are unconditionally OK. */
11948 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
11949 goto identical_types;
11951 last_eq_type = sequence_type (*last_ts);
11952 eq_type = sequence_type (sym->ts);
11954 /* Since the pair of objects is not of the same type, mixed or
11955 non-default sequences can be rejected. */
11957 msg = "Sequence %s with mixed components in EQUIVALENCE "
11958 "statement at %L with different type objects";
11960 && last_eq_type == SEQ_MIXED
11961 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
11963 || (eq_type == SEQ_MIXED
11964 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11965 &e->where) == FAILURE))
11968 msg = "Non-default type object or sequence %s in EQUIVALENCE "
11969 "statement at %L with objects of different type";
11971 && last_eq_type == SEQ_NONDEFAULT
11972 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
11973 last_where) == FAILURE)
11974 || (eq_type == SEQ_NONDEFAULT
11975 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11976 &e->where) == FAILURE))
11979 msg ="Non-CHARACTER object '%s' in default CHARACTER "
11980 "EQUIVALENCE statement at %L";
11981 if (last_eq_type == SEQ_CHARACTER
11982 && eq_type != SEQ_CHARACTER
11983 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11984 &e->where) == FAILURE)
11987 msg ="Non-NUMERIC object '%s' in default NUMERIC "
11988 "EQUIVALENCE statement at %L";
11989 if (last_eq_type == SEQ_NUMERIC
11990 && eq_type != SEQ_NUMERIC
11991 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
11992 &e->where) == FAILURE)
11997 last_where = &e->where;
12002 /* Shall not be an automatic array. */
12003 if (e->ref->type == REF_ARRAY
12004 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12006 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12007 "an EQUIVALENCE object", sym->name, &e->where);
12014 /* Shall not be a structure component. */
12015 if (r->type == REF_COMPONENT)
12017 gfc_error ("Structure component '%s' at %L cannot be an "
12018 "EQUIVALENCE object",
12019 r->u.c.component->name, &e->where);
12023 /* A substring shall not have length zero. */
12024 if (r->type == REF_SUBSTRING)
12026 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12028 gfc_error ("Substring at %L has length zero",
12029 &r->u.ss.start->where);
12039 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12042 resolve_fntype (gfc_namespace *ns)
12044 gfc_entry_list *el;
12047 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12050 /* If there are any entries, ns->proc_name is the entry master
12051 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12053 sym = ns->entries->sym;
12055 sym = ns->proc_name;
12056 if (sym->result == sym
12057 && sym->ts.type == BT_UNKNOWN
12058 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12059 && !sym->attr.untyped)
12061 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12062 sym->name, &sym->declared_at);
12063 sym->attr.untyped = 1;
12066 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12067 && !sym->attr.contained
12068 && !gfc_check_access (sym->ts.u.derived->attr.access,
12069 sym->ts.u.derived->ns->default_access)
12070 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12072 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12073 "%L of PRIVATE type '%s'", sym->name,
12074 &sym->declared_at, sym->ts.u.derived->name);
12078 for (el = ns->entries->next; el; el = el->next)
12080 if (el->sym->result == el->sym
12081 && el->sym->ts.type == BT_UNKNOWN
12082 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12083 && !el->sym->attr.untyped)
12085 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12086 el->sym->name, &el->sym->declared_at);
12087 el->sym->attr.untyped = 1;
12093 /* 12.3.2.1.1 Defined operators. */
12096 check_uop_procedure (gfc_symbol *sym, locus where)
12098 gfc_formal_arglist *formal;
12100 if (!sym->attr.function)
12102 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12103 sym->name, &where);
12107 if (sym->ts.type == BT_CHARACTER
12108 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12109 && !(sym->result && sym->result->ts.u.cl
12110 && sym->result->ts.u.cl->length))
12112 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12113 "character length", sym->name, &where);
12117 formal = sym->formal;
12118 if (!formal || !formal->sym)
12120 gfc_error ("User operator procedure '%s' at %L must have at least "
12121 "one argument", sym->name, &where);
12125 if (formal->sym->attr.intent != INTENT_IN)
12127 gfc_error ("First argument of operator interface at %L must be "
12128 "INTENT(IN)", &where);
12132 if (formal->sym->attr.optional)
12134 gfc_error ("First argument of operator interface at %L cannot be "
12135 "optional", &where);
12139 formal = formal->next;
12140 if (!formal || !formal->sym)
12143 if (formal->sym->attr.intent != INTENT_IN)
12145 gfc_error ("Second argument of operator interface at %L must be "
12146 "INTENT(IN)", &where);
12150 if (formal->sym->attr.optional)
12152 gfc_error ("Second argument of operator interface at %L cannot be "
12153 "optional", &where);
12159 gfc_error ("Operator interface at %L must have, at most, two "
12160 "arguments", &where);
12168 gfc_resolve_uops (gfc_symtree *symtree)
12170 gfc_interface *itr;
12172 if (symtree == NULL)
12175 gfc_resolve_uops (symtree->left);
12176 gfc_resolve_uops (symtree->right);
12178 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12179 check_uop_procedure (itr->sym, itr->sym->declared_at);
12183 /* Examine all of the expressions associated with a program unit,
12184 assign types to all intermediate expressions, make sure that all
12185 assignments are to compatible types and figure out which names
12186 refer to which functions or subroutines. It doesn't check code
12187 block, which is handled by resolve_code. */
12190 resolve_types (gfc_namespace *ns)
12196 gfc_namespace* old_ns = gfc_current_ns;
12198 /* Check that all IMPLICIT types are ok. */
12199 if (!ns->seen_implicit_none)
12202 for (letter = 0; letter != GFC_LETTERS; ++letter)
12203 if (ns->set_flag[letter]
12204 && resolve_typespec_used (&ns->default_type[letter],
12205 &ns->implicit_loc[letter],
12210 gfc_current_ns = ns;
12212 resolve_entries (ns);
12214 resolve_common_vars (ns->blank_common.head, false);
12215 resolve_common_blocks (ns->common_root);
12217 resolve_contained_functions (ns);
12219 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12221 for (cl = ns->cl_list; cl; cl = cl->next)
12222 resolve_charlen (cl);
12224 gfc_traverse_ns (ns, resolve_symbol);
12226 resolve_fntype (ns);
12228 for (n = ns->contained; n; n = n->sibling)
12230 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12231 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12232 "also be PURE", n->proc_name->name,
12233 &n->proc_name->declared_at);
12239 gfc_check_interfaces (ns);
12241 gfc_traverse_ns (ns, resolve_values);
12247 for (d = ns->data; d; d = d->next)
12251 gfc_traverse_ns (ns, gfc_formalize_init_value);
12253 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12255 if (ns->common_root != NULL)
12256 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12258 for (eq = ns->equiv; eq; eq = eq->next)
12259 resolve_equivalence (eq);
12261 /* Warn about unused labels. */
12262 if (warn_unused_label)
12263 warn_unused_fortran_label (ns->st_labels);
12265 gfc_resolve_uops (ns->uop_root);
12267 gfc_current_ns = old_ns;
12271 /* Call resolve_code recursively. */
12274 resolve_codes (gfc_namespace *ns)
12277 bitmap_obstack old_obstack;
12279 for (n = ns->contained; n; n = n->sibling)
12282 gfc_current_ns = ns;
12284 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12285 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12288 /* Set to an out of range value. */
12289 current_entry_id = -1;
12291 old_obstack = labels_obstack;
12292 bitmap_obstack_initialize (&labels_obstack);
12294 resolve_code (ns->code, ns);
12296 bitmap_obstack_release (&labels_obstack);
12297 labels_obstack = old_obstack;
12301 /* This function is called after a complete program unit has been compiled.
12302 Its purpose is to examine all of the expressions associated with a program
12303 unit, assign types to all intermediate expressions, make sure that all
12304 assignments are to compatible types and figure out which names refer to
12305 which functions or subroutines. */
12308 gfc_resolve (gfc_namespace *ns)
12310 gfc_namespace *old_ns;
12311 code_stack *old_cs_base;
12317 old_ns = gfc_current_ns;
12318 old_cs_base = cs_base;
12320 resolve_types (ns);
12321 resolve_codes (ns);
12323 gfc_current_ns = old_ns;
12324 cs_base = old_cs_base;