1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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 */
32 #include "constructor.h"
34 /* Types used in equivalence statements. */
38 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
42 /* Stack to keep track of the nesting of blocks as we move through the
43 code. See resolve_branch() and resolve_code(). */
45 typedef struct code_stack
47 struct gfc_code *head, *current;
48 struct code_stack *prev;
50 /* This bitmap keeps track of the targets valid for a branch from
51 inside this block except for END {IF|SELECT}s of enclosing
53 bitmap reachable_labels;
57 static code_stack *cs_base = NULL;
60 /* Nonzero if we're inside a FORALL block. */
62 static int forall_flag;
64 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
66 static int omp_workshare_flag;
68 /* Nonzero if we are processing a formal arglist. The corresponding function
69 resets the flag each time that it is read. */
70 static int formal_arg_flag = 0;
72 /* True if we are resolving a specification expression. */
73 static int specification_expr = 0;
75 /* The id of the last entry seen. */
76 static int current_entry_id;
78 /* We use bitmaps to determine if a branch target is valid. */
79 static bitmap_obstack labels_obstack;
81 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
82 static bool inquiry_argument = false;
85 gfc_is_formal_arg (void)
87 return formal_arg_flag;
90 /* Is the symbol host associated? */
92 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
94 for (ns = ns->parent; ns; ns = ns->parent)
103 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
104 an ABSTRACT derived-type. If where is not NULL, an error message with that
105 locus is printed, optionally using name. */
108 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
110 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
115 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
116 name, where, ts->u.derived->name);
118 gfc_error ("ABSTRACT type '%s' used at %L",
119 ts->u.derived->name, where);
129 /* Resolve types of formal argument lists. These have to be done early so that
130 the formal argument lists of module procedures can be copied to the
131 containing module before the individual procedures are resolved
132 individually. We also resolve argument lists of procedures in interface
133 blocks because they are self-contained scoping units.
135 Since a dummy argument cannot be a non-dummy procedure, the only
136 resort left for untyped names are the IMPLICIT types. */
139 resolve_formal_arglist (gfc_symbol *proc)
141 gfc_formal_arglist *f;
145 if (proc->result != NULL)
150 if (gfc_elemental (proc)
151 || sym->attr.pointer || sym->attr.allocatable
152 || (sym->as && sym->as->rank > 0))
154 proc->attr.always_explicit = 1;
155 sym->attr.always_explicit = 1;
160 for (f = proc->formal; f; f = f->next)
166 /* Alternate return placeholder. */
167 if (gfc_elemental (proc))
168 gfc_error ("Alternate return specifier in elemental subroutine "
169 "'%s' at %L is not allowed", proc->name,
171 if (proc->attr.function)
172 gfc_error ("Alternate return specifier in function "
173 "'%s' at %L is not allowed", proc->name,
178 if (sym->attr.if_source != IFSRC_UNKNOWN)
179 resolve_formal_arglist (sym);
181 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
183 if (gfc_pure (proc) && !gfc_pure (sym))
185 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
186 "also be PURE", sym->name, &sym->declared_at);
190 if (gfc_elemental (proc))
192 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
193 "procedure", &sym->declared_at);
197 if (sym->attr.function
198 && sym->ts.type == BT_UNKNOWN
199 && sym->attr.intrinsic)
201 gfc_intrinsic_sym *isym;
202 isym = gfc_find_function (sym->name);
203 if (isym == NULL || !isym->specific)
205 gfc_error ("Unable to find a specific INTRINSIC procedure "
206 "for the reference '%s' at %L", sym->name,
215 if (sym->ts.type == BT_UNKNOWN)
217 if (!sym->attr.function || sym->result == sym)
218 gfc_set_default_type (sym, 1, sym->ns);
221 gfc_resolve_array_spec (sym->as, 0);
223 /* We can't tell if an array with dimension (:) is assumed or deferred
224 shape until we know if it has the pointer or allocatable attributes.
226 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
227 && !(sym->attr.pointer || sym->attr.allocatable))
229 sym->as->type = AS_ASSUMED_SHAPE;
230 for (i = 0; i < sym->as->rank; i++)
231 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
235 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
236 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
237 || sym->attr.optional)
239 proc->attr.always_explicit = 1;
241 proc->result->attr.always_explicit = 1;
244 /* If the flavor is unknown at this point, it has to be a variable.
245 A procedure specification would have already set the type. */
247 if (sym->attr.flavor == FL_UNKNOWN)
248 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
250 if (gfc_pure (proc) && !sym->attr.pointer
251 && sym->attr.flavor != FL_PROCEDURE)
253 if (proc->attr.function && sym->attr.intent != INTENT_IN)
254 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
255 "INTENT(IN)", sym->name, proc->name,
258 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
259 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
260 "have its INTENT specified", sym->name, proc->name,
264 if (gfc_elemental (proc))
267 if (sym->attr.codimension)
269 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
270 "procedure", sym->name, &sym->declared_at);
276 gfc_error ("Argument '%s' of elemental procedure at %L must "
277 "be scalar", sym->name, &sym->declared_at);
281 if (sym->attr.pointer)
283 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
284 "have the POINTER attribute", sym->name,
289 if (sym->attr.flavor == FL_PROCEDURE)
291 gfc_error ("Dummy procedure '%s' not allowed in elemental "
292 "procedure '%s' at %L", sym->name, proc->name,
298 /* Each dummy shall be specified to be scalar. */
299 if (proc->attr.proc == PROC_ST_FUNCTION)
303 gfc_error ("Argument '%s' of statement function at %L must "
304 "be scalar", sym->name, &sym->declared_at);
308 if (sym->ts.type == BT_CHARACTER)
310 gfc_charlen *cl = sym->ts.u.cl;
311 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
313 gfc_error ("Character-valued argument '%s' of statement "
314 "function at %L must have constant length",
315 sym->name, &sym->declared_at);
325 /* Work function called when searching for symbols that have argument lists
326 associated with them. */
329 find_arglists (gfc_symbol *sym)
331 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
334 resolve_formal_arglist (sym);
338 /* Given a namespace, resolve all formal argument lists within the namespace.
342 resolve_formal_arglists (gfc_namespace *ns)
347 gfc_traverse_ns (ns, find_arglists);
352 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
356 /* If this namespace is not a function or an entry master function,
358 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
359 || sym->attr.entry_master)
362 /* Try to find out of what the return type is. */
363 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
365 t = gfc_set_default_type (sym->result, 0, ns);
367 if (t == FAILURE && !sym->result->attr.untyped)
369 if (sym->result == sym)
370 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
371 sym->name, &sym->declared_at);
372 else if (!sym->result->attr.proc_pointer)
373 gfc_error ("Result '%s' of contained function '%s' at %L has "
374 "no IMPLICIT type", sym->result->name, sym->name,
375 &sym->result->declared_at);
376 sym->result->attr.untyped = 1;
380 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
381 type, lists the only ways a character length value of * can be used:
382 dummy arguments of procedures, named constants, and function results
383 in external functions. Internal function results and results of module
384 procedures are not on this list, ergo, not permitted. */
386 if (sym->result->ts.type == BT_CHARACTER)
388 gfc_charlen *cl = sym->result->ts.u.cl;
389 if (!cl || !cl->length)
391 /* See if this is a module-procedure and adapt error message
394 gcc_assert (ns->parent && ns->parent->proc_name);
395 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
397 gfc_error ("Character-valued %s '%s' at %L must not be"
399 module_proc ? _("module procedure")
400 : _("internal function"),
401 sym->name, &sym->declared_at);
407 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
408 introduce duplicates. */
411 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
413 gfc_formal_arglist *f, *new_arglist;
416 for (; new_args != NULL; new_args = new_args->next)
418 new_sym = new_args->sym;
419 /* See if this arg is already in the formal argument list. */
420 for (f = proc->formal; f; f = f->next)
422 if (new_sym == f->sym)
429 /* Add a new argument. Argument order is not important. */
430 new_arglist = gfc_get_formal_arglist ();
431 new_arglist->sym = new_sym;
432 new_arglist->next = proc->formal;
433 proc->formal = new_arglist;
438 /* Flag the arguments that are not present in all entries. */
441 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
443 gfc_formal_arglist *f, *head;
446 for (f = proc->formal; f; f = f->next)
451 for (new_args = head; new_args; new_args = new_args->next)
453 if (new_args->sym == f->sym)
460 f->sym->attr.not_always_present = 1;
465 /* Resolve alternate entry points. If a symbol has multiple entry points we
466 create a new master symbol for the main routine, and turn the existing
467 symbol into an entry point. */
470 resolve_entries (gfc_namespace *ns)
472 gfc_namespace *old_ns;
476 char name[GFC_MAX_SYMBOL_LEN + 1];
477 static int master_count = 0;
479 if (ns->proc_name == NULL)
482 /* No need to do anything if this procedure doesn't have alternate entry
487 /* We may already have resolved alternate entry points. */
488 if (ns->proc_name->attr.entry_master)
491 /* If this isn't a procedure something has gone horribly wrong. */
492 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
494 /* Remember the current namespace. */
495 old_ns = gfc_current_ns;
499 /* Add the main entry point to the list of entry points. */
500 el = gfc_get_entry_list ();
501 el->sym = ns->proc_name;
503 el->next = ns->entries;
505 ns->proc_name->attr.entry = 1;
507 /* If it is a module function, it needs to be in the right namespace
508 so that gfc_get_fake_result_decl can gather up the results. The
509 need for this arose in get_proc_name, where these beasts were
510 left in their own namespace, to keep prior references linked to
511 the entry declaration.*/
512 if (ns->proc_name->attr.function
513 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
516 /* Do the same for entries where the master is not a module
517 procedure. These are retained in the module namespace because
518 of the module procedure declaration. */
519 for (el = el->next; el; el = el->next)
520 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
521 && el->sym->attr.mod_proc)
525 /* Add an entry statement for it. */
532 /* Create a new symbol for the master function. */
533 /* Give the internal function a unique name (within this file).
534 Also include the function name so the user has some hope of figuring
535 out what is going on. */
536 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
537 master_count++, ns->proc_name->name);
538 gfc_get_ha_symbol (name, &proc);
539 gcc_assert (proc != NULL);
541 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
542 if (ns->proc_name->attr.subroutine)
543 gfc_add_subroutine (&proc->attr, proc->name, NULL);
547 gfc_typespec *ts, *fts;
548 gfc_array_spec *as, *fas;
549 gfc_add_function (&proc->attr, proc->name, NULL);
551 fas = ns->entries->sym->as;
552 fas = fas ? fas : ns->entries->sym->result->as;
553 fts = &ns->entries->sym->result->ts;
554 if (fts->type == BT_UNKNOWN)
555 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
556 for (el = ns->entries->next; el; el = el->next)
558 ts = &el->sym->result->ts;
560 as = as ? as : el->sym->result->as;
561 if (ts->type == BT_UNKNOWN)
562 ts = gfc_get_default_type (el->sym->result->name, NULL);
564 if (! gfc_compare_types (ts, fts)
565 || (el->sym->result->attr.dimension
566 != ns->entries->sym->result->attr.dimension)
567 || (el->sym->result->attr.pointer
568 != ns->entries->sym->result->attr.pointer))
570 else if (as && fas && ns->entries->sym->result != el->sym->result
571 && gfc_compare_array_spec (as, fas) == 0)
572 gfc_error ("Function %s at %L has entries with mismatched "
573 "array specifications", ns->entries->sym->name,
574 &ns->entries->sym->declared_at);
575 /* The characteristics need to match and thus both need to have
576 the same string length, i.e. both len=*, or both len=4.
577 Having both len=<variable> is also possible, but difficult to
578 check at compile time. */
579 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
580 && (((ts->u.cl->length && !fts->u.cl->length)
581 ||(!ts->u.cl->length && fts->u.cl->length))
583 && ts->u.cl->length->expr_type
584 != fts->u.cl->length->expr_type)
586 && ts->u.cl->length->expr_type == EXPR_CONSTANT
587 && mpz_cmp (ts->u.cl->length->value.integer,
588 fts->u.cl->length->value.integer) != 0)))
589 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
590 "entries returning variables of different "
591 "string lengths", ns->entries->sym->name,
592 &ns->entries->sym->declared_at);
597 sym = ns->entries->sym->result;
598 /* All result types the same. */
600 if (sym->attr.dimension)
601 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
602 if (sym->attr.pointer)
603 gfc_add_pointer (&proc->attr, NULL);
607 /* Otherwise the result will be passed through a union by
609 proc->attr.mixed_entry_master = 1;
610 for (el = ns->entries; el; el = el->next)
612 sym = el->sym->result;
613 if (sym->attr.dimension)
615 if (el == ns->entries)
616 gfc_error ("FUNCTION result %s can't be an array in "
617 "FUNCTION %s at %L", sym->name,
618 ns->entries->sym->name, &sym->declared_at);
620 gfc_error ("ENTRY result %s can't be an array in "
621 "FUNCTION %s at %L", sym->name,
622 ns->entries->sym->name, &sym->declared_at);
624 else if (sym->attr.pointer)
626 if (el == ns->entries)
627 gfc_error ("FUNCTION result %s can't be a POINTER in "
628 "FUNCTION %s at %L", sym->name,
629 ns->entries->sym->name, &sym->declared_at);
631 gfc_error ("ENTRY result %s can't be a POINTER in "
632 "FUNCTION %s at %L", sym->name,
633 ns->entries->sym->name, &sym->declared_at);
638 if (ts->type == BT_UNKNOWN)
639 ts = gfc_get_default_type (sym->name, NULL);
643 if (ts->kind == gfc_default_integer_kind)
647 if (ts->kind == gfc_default_real_kind
648 || ts->kind == gfc_default_double_kind)
652 if (ts->kind == gfc_default_complex_kind)
656 if (ts->kind == gfc_default_logical_kind)
660 /* We will issue error elsewhere. */
668 if (el == ns->entries)
669 gfc_error ("FUNCTION result %s can't be of type %s "
670 "in FUNCTION %s at %L", sym->name,
671 gfc_typename (ts), ns->entries->sym->name,
674 gfc_error ("ENTRY result %s can't be of type %s "
675 "in FUNCTION %s at %L", sym->name,
676 gfc_typename (ts), ns->entries->sym->name,
683 proc->attr.access = ACCESS_PRIVATE;
684 proc->attr.entry_master = 1;
686 /* Merge all the entry point arguments. */
687 for (el = ns->entries; el; el = el->next)
688 merge_argument_lists (proc, el->sym->formal);
690 /* Check the master formal arguments for any that are not
691 present in all entry points. */
692 for (el = ns->entries; el; el = el->next)
693 check_argument_lists (proc, el->sym->formal);
695 /* Use the master function for the function body. */
696 ns->proc_name = proc;
698 /* Finalize the new symbols. */
699 gfc_commit_symbols ();
701 /* Restore the original namespace. */
702 gfc_current_ns = old_ns;
706 /* Resolve common variables. */
708 resolve_common_vars (gfc_symbol *sym, bool named_common)
710 gfc_symbol *csym = sym;
712 for (; csym; csym = csym->common_next)
714 if (csym->value || csym->attr.data)
716 if (!csym->ns->is_block_data)
717 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
718 "but only in BLOCK DATA initialization is "
719 "allowed", csym->name, &csym->declared_at);
720 else if (!named_common)
721 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
722 "in a blank COMMON but initialization is only "
723 "allowed in named common blocks", csym->name,
727 if (csym->ts.type != BT_DERIVED)
730 if (!(csym->ts.u.derived->attr.sequence
731 || csym->ts.u.derived->attr.is_bind_c))
732 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
733 "has neither the SEQUENCE nor the BIND(C) "
734 "attribute", csym->name, &csym->declared_at);
735 if (csym->ts.u.derived->attr.alloc_comp)
736 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
737 "has an ultimate component that is "
738 "allocatable", csym->name, &csym->declared_at);
739 if (gfc_has_default_initializer (csym->ts.u.derived))
740 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
741 "may not have default initializer", csym->name,
744 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
745 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
749 /* Resolve common blocks. */
751 resolve_common_blocks (gfc_symtree *common_root)
755 if (common_root == NULL)
758 if (common_root->left)
759 resolve_common_blocks (common_root->left);
760 if (common_root->right)
761 resolve_common_blocks (common_root->right);
763 resolve_common_vars (common_root->n.common->head, true);
765 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
769 if (sym->attr.flavor == FL_PARAMETER)
770 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
771 sym->name, &common_root->n.common->where, &sym->declared_at);
773 if (sym->attr.intrinsic)
774 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
775 sym->name, &common_root->n.common->where);
776 else if (sym->attr.result
777 || gfc_is_function_return_value (sym, gfc_current_ns))
778 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
779 "that is also a function result", sym->name,
780 &common_root->n.common->where);
781 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
782 && sym->attr.proc != PROC_ST_FUNCTION)
783 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
784 "that is also a global procedure", sym->name,
785 &common_root->n.common->where);
789 /* Resolve contained function types. Because contained functions can call one
790 another, they have to be worked out before any of the contained procedures
793 The good news is that if a function doesn't already have a type, the only
794 way it can get one is through an IMPLICIT type or a RESULT variable, because
795 by definition contained functions are contained namespace they're contained
796 in, not in a sibling or parent namespace. */
799 resolve_contained_functions (gfc_namespace *ns)
801 gfc_namespace *child;
804 resolve_formal_arglists (ns);
806 for (child = ns->contained; child; child = child->sibling)
808 /* Resolve alternate entry points first. */
809 resolve_entries (child);
811 /* Then check function return types. */
812 resolve_contained_fntype (child->proc_name, child);
813 for (el = child->entries; el; el = el->next)
814 resolve_contained_fntype (el->sym, child);
819 /* Resolve all of the elements of a structure constructor and make sure that
820 the types are correct. */
823 resolve_structure_cons (gfc_expr *expr)
825 gfc_constructor *cons;
831 cons = gfc_constructor_first (expr->value.constructor);
832 /* A constructor may have references if it is the result of substituting a
833 parameter variable. In this case we just pull out the component we
836 comp = expr->ref->u.c.sym->components;
838 comp = expr->ts.u.derived->components;
840 /* See if the user is trying to invoke a structure constructor for one of
841 the iso_c_binding derived types. */
842 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
843 && expr->ts.u.derived->ts.is_iso_c && cons
844 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
846 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
847 expr->ts.u.derived->name, &(expr->where));
851 /* Return if structure constructor is c_null_(fun)prt. */
852 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
853 && expr->ts.u.derived->ts.is_iso_c && cons
854 && cons->expr && cons->expr->expr_type == EXPR_NULL)
857 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
864 if (gfc_resolve_expr (cons->expr) == FAILURE)
870 rank = comp->as ? comp->as->rank : 0;
871 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
872 && (comp->attr.allocatable || cons->expr->rank))
874 gfc_error ("The rank of the element in the derived type "
875 "constructor at %L does not match that of the "
876 "component (%d/%d)", &cons->expr->where,
877 cons->expr->rank, rank);
881 /* If we don't have the right type, try to convert it. */
883 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
886 if (strcmp (comp->name, "$extends") == 0)
888 /* Can afford to be brutal with the $extends initializer.
889 The derived type can get lost because it is PRIVATE
890 but it is not usage constrained by the standard. */
891 cons->expr->ts = comp->ts;
894 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
895 gfc_error ("The element in the derived type constructor at %L, "
896 "for pointer component '%s', is %s but should be %s",
897 &cons->expr->where, comp->name,
898 gfc_basic_typename (cons->expr->ts.type),
899 gfc_basic_typename (comp->ts.type));
901 t = gfc_convert_type (cons->expr, &comp->ts, 1);
904 if (cons->expr->expr_type == EXPR_NULL
905 && !(comp->attr.pointer || comp->attr.allocatable
906 || comp->attr.proc_pointer
907 || (comp->ts.type == BT_CLASS
908 && (CLASS_DATA (comp)->attr.pointer
909 || CLASS_DATA (comp)->attr.allocatable))))
912 gfc_error ("The NULL in the derived type constructor at %L is "
913 "being applied to component '%s', which is neither "
914 "a POINTER nor ALLOCATABLE", &cons->expr->where,
918 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
921 a = gfc_expr_attr (cons->expr);
923 if (!a.pointer && !a.target)
926 gfc_error ("The element in the derived type constructor at %L, "
927 "for pointer component '%s' should be a POINTER or "
928 "a TARGET", &cons->expr->where, comp->name);
931 /* F2003, C1272 (3). */
932 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
933 && (gfc_impure_variable (cons->expr->symtree->n.sym)
934 || gfc_is_coindexed (cons->expr)))
937 gfc_error ("Invalid expression in the derived type constructor for "
938 "pointer component '%s' at %L in PURE procedure",
939 comp->name, &cons->expr->where);
947 /****************** Expression name resolution ******************/
949 /* Returns 0 if a symbol was not declared with a type or
950 attribute declaration statement, nonzero otherwise. */
953 was_declared (gfc_symbol *sym)
959 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
962 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
963 || a.optional || a.pointer || a.save || a.target || a.volatile_
964 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
965 || a.asynchronous || a.codimension)
972 /* Determine if a symbol is generic or not. */
975 generic_sym (gfc_symbol *sym)
979 if (sym->attr.generic ||
980 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
983 if (was_declared (sym) || sym->ns->parent == NULL)
986 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
993 return generic_sym (s);
1000 /* Determine if a symbol is specific or not. */
1003 specific_sym (gfc_symbol *sym)
1007 if (sym->attr.if_source == IFSRC_IFBODY
1008 || sym->attr.proc == PROC_MODULE
1009 || sym->attr.proc == PROC_INTERNAL
1010 || sym->attr.proc == PROC_ST_FUNCTION
1011 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1012 || sym->attr.external)
1015 if (was_declared (sym) || sym->ns->parent == NULL)
1018 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1020 return (s == NULL) ? 0 : specific_sym (s);
1024 /* Figure out if the procedure is specific, generic or unknown. */
1027 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1031 procedure_kind (gfc_symbol *sym)
1033 if (generic_sym (sym))
1034 return PTYPE_GENERIC;
1036 if (specific_sym (sym))
1037 return PTYPE_SPECIFIC;
1039 return PTYPE_UNKNOWN;
1042 /* Check references to assumed size arrays. The flag need_full_assumed_size
1043 is nonzero when matching actual arguments. */
1045 static int need_full_assumed_size = 0;
1048 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1050 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1053 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1054 What should it be? */
1055 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1056 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1057 && (e->ref->u.ar.type == AR_FULL))
1059 gfc_error ("The upper bound in the last dimension must "
1060 "appear in the reference to the assumed size "
1061 "array '%s' at %L", sym->name, &e->where);
1068 /* Look for bad assumed size array references in argument expressions
1069 of elemental and array valued intrinsic procedures. Since this is
1070 called from procedure resolution functions, it only recurses at
1074 resolve_assumed_size_actual (gfc_expr *e)
1079 switch (e->expr_type)
1082 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1087 if (resolve_assumed_size_actual (e->value.op.op1)
1088 || resolve_assumed_size_actual (e->value.op.op2))
1099 /* Check a generic procedure, passed as an actual argument, to see if
1100 there is a matching specific name. If none, it is an error, and if
1101 more than one, the reference is ambiguous. */
1103 count_specific_procs (gfc_expr *e)
1110 sym = e->symtree->n.sym;
1112 for (p = sym->generic; p; p = p->next)
1113 if (strcmp (sym->name, p->sym->name) == 0)
1115 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1121 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1125 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1126 "argument at %L", sym->name, &e->where);
1132 /* See if a call to sym could possibly be a not allowed RECURSION because of
1133 a missing RECURIVE declaration. This means that either sym is the current
1134 context itself, or sym is the parent of a contained procedure calling its
1135 non-RECURSIVE containing procedure.
1136 This also works if sym is an ENTRY. */
1139 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1141 gfc_symbol* proc_sym;
1142 gfc_symbol* context_proc;
1143 gfc_namespace* real_context;
1145 if (sym->attr.flavor == FL_PROGRAM)
1148 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1150 /* If we've got an ENTRY, find real procedure. */
1151 if (sym->attr.entry && sym->ns->entries)
1152 proc_sym = sym->ns->entries->sym;
1156 /* If sym is RECURSIVE, all is well of course. */
1157 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1160 /* Find the context procedure's "real" symbol if it has entries.
1161 We look for a procedure symbol, so recurse on the parents if we don't
1162 find one (like in case of a BLOCK construct). */
1163 for (real_context = context; ; real_context = real_context->parent)
1165 /* We should find something, eventually! */
1166 gcc_assert (real_context);
1168 context_proc = (real_context->entries ? real_context->entries->sym
1169 : real_context->proc_name);
1171 /* In some special cases, there may not be a proc_name, like for this
1173 real(bad_kind()) function foo () ...
1174 when checking the call to bad_kind ().
1175 In these cases, we simply return here and assume that the
1180 if (context_proc->attr.flavor != FL_LABEL)
1184 /* A call from sym's body to itself is recursion, of course. */
1185 if (context_proc == proc_sym)
1188 /* The same is true if context is a contained procedure and sym the
1190 if (context_proc->attr.contained)
1192 gfc_symbol* parent_proc;
1194 gcc_assert (context->parent);
1195 parent_proc = (context->parent->entries ? context->parent->entries->sym
1196 : context->parent->proc_name);
1198 if (parent_proc == proc_sym)
1206 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1207 its typespec and formal argument list. */
1210 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1212 gfc_intrinsic_sym* isym;
1218 /* We already know this one is an intrinsic, so we don't call
1219 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1220 gfc_find_subroutine directly to check whether it is a function or
1223 if ((isym = gfc_find_function (sym->name)))
1225 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1226 && !sym->attr.implicit_type)
1227 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1228 " ignored", sym->name, &sym->declared_at);
1230 if (!sym->attr.function &&
1231 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1236 else if ((isym = gfc_find_subroutine (sym->name)))
1238 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1240 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1241 " specifier", sym->name, &sym->declared_at);
1245 if (!sym->attr.subroutine &&
1246 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1251 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1256 gfc_copy_formal_args_intr (sym, isym);
1258 /* Check it is actually available in the standard settings. */
1259 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1262 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1263 " available in the current standard settings but %s. Use"
1264 " an appropriate -std=* option or enable -fall-intrinsics"
1265 " in order to use it.",
1266 sym->name, &sym->declared_at, symstd);
1274 /* Resolve a procedure expression, like passing it to a called procedure or as
1275 RHS for a procedure pointer assignment. */
1278 resolve_procedure_expression (gfc_expr* expr)
1282 if (expr->expr_type != EXPR_VARIABLE)
1284 gcc_assert (expr->symtree);
1286 sym = expr->symtree->n.sym;
1288 if (sym->attr.intrinsic)
1289 resolve_intrinsic (sym, &expr->where);
1291 if (sym->attr.flavor != FL_PROCEDURE
1292 || (sym->attr.function && sym->result == sym))
1295 /* A non-RECURSIVE procedure that is used as procedure expression within its
1296 own body is in danger of being called recursively. */
1297 if (is_illegal_recursion (sym, gfc_current_ns))
1298 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1299 " itself recursively. Declare it RECURSIVE or use"
1300 " -frecursive", sym->name, &expr->where);
1306 /* Resolve an actual argument list. Most of the time, this is just
1307 resolving the expressions in the list.
1308 The exception is that we sometimes have to decide whether arguments
1309 that look like procedure arguments are really simple variable
1313 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1314 bool no_formal_args)
1317 gfc_symtree *parent_st;
1319 int save_need_full_assumed_size;
1320 gfc_component *comp;
1322 for (; arg; arg = arg->next)
1327 /* Check the label is a valid branching target. */
1330 if (arg->label->defined == ST_LABEL_UNKNOWN)
1332 gfc_error ("Label %d referenced at %L is never defined",
1333 arg->label->value, &arg->label->where);
1340 if (gfc_is_proc_ptr_comp (e, &comp))
1343 if (e->expr_type == EXPR_PPC)
1345 if (comp->as != NULL)
1346 e->rank = comp->as->rank;
1347 e->expr_type = EXPR_FUNCTION;
1349 if (gfc_resolve_expr (e) == FAILURE)
1354 if (e->expr_type == EXPR_VARIABLE
1355 && e->symtree->n.sym->attr.generic
1357 && count_specific_procs (e) != 1)
1360 if (e->ts.type != BT_PROCEDURE)
1362 save_need_full_assumed_size = need_full_assumed_size;
1363 if (e->expr_type != EXPR_VARIABLE)
1364 need_full_assumed_size = 0;
1365 if (gfc_resolve_expr (e) != SUCCESS)
1367 need_full_assumed_size = save_need_full_assumed_size;
1371 /* See if the expression node should really be a variable reference. */
1373 sym = e->symtree->n.sym;
1375 if (sym->attr.flavor == FL_PROCEDURE
1376 || sym->attr.intrinsic
1377 || sym->attr.external)
1381 /* If a procedure is not already determined to be something else
1382 check if it is intrinsic. */
1383 if (!sym->attr.intrinsic
1384 && !(sym->attr.external || sym->attr.use_assoc
1385 || sym->attr.if_source == IFSRC_IFBODY)
1386 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1387 sym->attr.intrinsic = 1;
1389 if (sym->attr.proc == PROC_ST_FUNCTION)
1391 gfc_error ("Statement function '%s' at %L is not allowed as an "
1392 "actual argument", sym->name, &e->where);
1395 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1396 sym->attr.subroutine);
1397 if (sym->attr.intrinsic && actual_ok == 0)
1399 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1400 "actual argument", sym->name, &e->where);
1403 if (sym->attr.contained && !sym->attr.use_assoc
1404 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1406 gfc_error ("Internal procedure '%s' is not allowed as an "
1407 "actual argument at %L", sym->name, &e->where);
1410 if (sym->attr.elemental && !sym->attr.intrinsic)
1412 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1413 "allowed as an actual argument at %L", sym->name,
1417 /* Check if a generic interface has a specific procedure
1418 with the same name before emitting an error. */
1419 if (sym->attr.generic && count_specific_procs (e) != 1)
1422 /* Just in case a specific was found for the expression. */
1423 sym = e->symtree->n.sym;
1425 /* If the symbol is the function that names the current (or
1426 parent) scope, then we really have a variable reference. */
1428 if (gfc_is_function_return_value (sym, sym->ns))
1431 /* If all else fails, see if we have a specific intrinsic. */
1432 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1434 gfc_intrinsic_sym *isym;
1436 isym = gfc_find_function (sym->name);
1437 if (isym == NULL || !isym->specific)
1439 gfc_error ("Unable to find a specific INTRINSIC procedure "
1440 "for the reference '%s' at %L", sym->name,
1445 sym->attr.intrinsic = 1;
1446 sym->attr.function = 1;
1449 if (gfc_resolve_expr (e) == FAILURE)
1454 /* See if the name is a module procedure in a parent unit. */
1456 if (was_declared (sym) || sym->ns->parent == NULL)
1459 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1461 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1465 if (parent_st == NULL)
1468 sym = parent_st->n.sym;
1469 e->symtree = parent_st; /* Point to the right thing. */
1471 if (sym->attr.flavor == FL_PROCEDURE
1472 || sym->attr.intrinsic
1473 || sym->attr.external)
1475 if (gfc_resolve_expr (e) == FAILURE)
1481 e->expr_type = EXPR_VARIABLE;
1483 if (sym->as != NULL)
1485 e->rank = sym->as->rank;
1486 e->ref = gfc_get_ref ();
1487 e->ref->type = REF_ARRAY;
1488 e->ref->u.ar.type = AR_FULL;
1489 e->ref->u.ar.as = sym->as;
1492 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1493 primary.c (match_actual_arg). If above code determines that it
1494 is a variable instead, it needs to be resolved as it was not
1495 done at the beginning of this function. */
1496 save_need_full_assumed_size = need_full_assumed_size;
1497 if (e->expr_type != EXPR_VARIABLE)
1498 need_full_assumed_size = 0;
1499 if (gfc_resolve_expr (e) != SUCCESS)
1501 need_full_assumed_size = save_need_full_assumed_size;
1504 /* Check argument list functions %VAL, %LOC and %REF. There is
1505 nothing to do for %REF. */
1506 if (arg->name && arg->name[0] == '%')
1508 if (strncmp ("%VAL", arg->name, 4) == 0)
1510 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1512 gfc_error ("By-value argument at %L is not of numeric "
1519 gfc_error ("By-value argument at %L cannot be an array or "
1520 "an array section", &e->where);
1524 /* Intrinsics are still PROC_UNKNOWN here. However,
1525 since same file external procedures are not resolvable
1526 in gfortran, it is a good deal easier to leave them to
1528 if (ptype != PROC_UNKNOWN
1529 && ptype != PROC_DUMMY
1530 && ptype != PROC_EXTERNAL
1531 && ptype != PROC_MODULE)
1533 gfc_error ("By-value argument at %L is not allowed "
1534 "in this context", &e->where);
1539 /* Statement functions have already been excluded above. */
1540 else if (strncmp ("%LOC", arg->name, 4) == 0
1541 && e->ts.type == BT_PROCEDURE)
1543 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1545 gfc_error ("Passing internal procedure at %L by location "
1546 "not allowed", &e->where);
1552 /* Fortran 2008, C1237. */
1553 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1554 && gfc_has_ultimate_pointer (e))
1556 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1557 "component", &e->where);
1566 /* Do the checks of the actual argument list that are specific to elemental
1567 procedures. If called with c == NULL, we have a function, otherwise if
1568 expr == NULL, we have a subroutine. */
1571 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1573 gfc_actual_arglist *arg0;
1574 gfc_actual_arglist *arg;
1575 gfc_symbol *esym = NULL;
1576 gfc_intrinsic_sym *isym = NULL;
1578 gfc_intrinsic_arg *iformal = NULL;
1579 gfc_formal_arglist *eformal = NULL;
1580 bool formal_optional = false;
1581 bool set_by_optional = false;
1585 /* Is this an elemental procedure? */
1586 if (expr && expr->value.function.actual != NULL)
1588 if (expr->value.function.esym != NULL
1589 && expr->value.function.esym->attr.elemental)
1591 arg0 = expr->value.function.actual;
1592 esym = expr->value.function.esym;
1594 else if (expr->value.function.isym != NULL
1595 && expr->value.function.isym->elemental)
1597 arg0 = expr->value.function.actual;
1598 isym = expr->value.function.isym;
1603 else if (c && c->ext.actual != NULL)
1605 arg0 = c->ext.actual;
1607 if (c->resolved_sym)
1608 esym = c->resolved_sym;
1610 esym = c->symtree->n.sym;
1613 if (!esym->attr.elemental)
1619 /* The rank of an elemental is the rank of its array argument(s). */
1620 for (arg = arg0; arg; arg = arg->next)
1622 if (arg->expr != NULL && arg->expr->rank > 0)
1624 rank = arg->expr->rank;
1625 if (arg->expr->expr_type == EXPR_VARIABLE
1626 && arg->expr->symtree->n.sym->attr.optional)
1627 set_by_optional = true;
1629 /* Function specific; set the result rank and shape. */
1633 if (!expr->shape && arg->expr->shape)
1635 expr->shape = gfc_get_shape (rank);
1636 for (i = 0; i < rank; i++)
1637 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1644 /* If it is an array, it shall not be supplied as an actual argument
1645 to an elemental procedure unless an array of the same rank is supplied
1646 as an actual argument corresponding to a nonoptional dummy argument of
1647 that elemental procedure(12.4.1.5). */
1648 formal_optional = false;
1650 iformal = isym->formal;
1652 eformal = esym->formal;
1654 for (arg = arg0; arg; arg = arg->next)
1658 if (eformal->sym && eformal->sym->attr.optional)
1659 formal_optional = true;
1660 eformal = eformal->next;
1662 else if (isym && iformal)
1664 if (iformal->optional)
1665 formal_optional = true;
1666 iformal = iformal->next;
1669 formal_optional = true;
1671 if (pedantic && arg->expr != NULL
1672 && arg->expr->expr_type == EXPR_VARIABLE
1673 && arg->expr->symtree->n.sym->attr.optional
1676 && (set_by_optional || arg->expr->rank != rank)
1677 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1679 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1680 "MISSING, it cannot be the actual argument of an "
1681 "ELEMENTAL procedure unless there is a non-optional "
1682 "argument with the same rank (12.4.1.5)",
1683 arg->expr->symtree->n.sym->name, &arg->expr->where);
1688 for (arg = arg0; arg; arg = arg->next)
1690 if (arg->expr == NULL || arg->expr->rank == 0)
1693 /* Being elemental, the last upper bound of an assumed size array
1694 argument must be present. */
1695 if (resolve_assumed_size_actual (arg->expr))
1698 /* Elemental procedure's array actual arguments must conform. */
1701 if (gfc_check_conformance (arg->expr, e,
1702 "elemental procedure") == FAILURE)
1709 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1710 is an array, the intent inout/out variable needs to be also an array. */
1711 if (rank > 0 && esym && expr == NULL)
1712 for (eformal = esym->formal, arg = arg0; arg && eformal;
1713 arg = arg->next, eformal = eformal->next)
1714 if ((eformal->sym->attr.intent == INTENT_OUT
1715 || eformal->sym->attr.intent == INTENT_INOUT)
1716 && arg->expr && arg->expr->rank == 0)
1718 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1719 "ELEMENTAL subroutine '%s' is a scalar, but another "
1720 "actual argument is an array", &arg->expr->where,
1721 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1722 : "INOUT", eformal->sym->name, esym->name);
1729 /* Go through each actual argument in ACTUAL and see if it can be
1730 implemented as an inlined, non-copying intrinsic. FNSYM is the
1731 function being called, or NULL if not known. */
1734 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1736 gfc_actual_arglist *ap;
1739 for (ap = actual; ap; ap = ap->next)
1741 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1742 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1744 ap->expr->inline_noncopying_intrinsic = 1;
1748 /* This function does the checking of references to global procedures
1749 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1750 77 and 95 standards. It checks for a gsymbol for the name, making
1751 one if it does not already exist. If it already exists, then the
1752 reference being resolved must correspond to the type of gsymbol.
1753 Otherwise, the new symbol is equipped with the attributes of the
1754 reference. The corresponding code that is called in creating
1755 global entities is parse.c.
1757 In addition, for all but -std=legacy, the gsymbols are used to
1758 check the interfaces of external procedures from the same file.
1759 The namespace of the gsymbol is resolved and then, once this is
1760 done the interface is checked. */
1764 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1766 if (!gsym_ns->proc_name->attr.recursive)
1769 if (sym->ns == gsym_ns)
1772 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1779 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1781 if (gsym_ns->entries)
1783 gfc_entry_list *entry = gsym_ns->entries;
1785 for (; entry; entry = entry->next)
1787 if (strcmp (sym->name, entry->sym->name) == 0)
1789 if (strcmp (gsym_ns->proc_name->name,
1790 sym->ns->proc_name->name) == 0)
1794 && strcmp (gsym_ns->proc_name->name,
1795 sym->ns->parent->proc_name->name) == 0)
1804 resolve_global_procedure (gfc_symbol *sym, locus *where,
1805 gfc_actual_arglist **actual, int sub)
1809 enum gfc_symbol_type type;
1811 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1813 gsym = gfc_get_gsymbol (sym->name);
1815 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1816 gfc_global_used (gsym, where);
1818 if (gfc_option.flag_whole_file
1819 && sym->attr.if_source == IFSRC_UNKNOWN
1820 && gsym->type != GSYM_UNKNOWN
1822 && gsym->ns->resolved != -1
1823 && gsym->ns->proc_name
1824 && not_in_recursive (sym, gsym->ns)
1825 && not_entry_self_reference (sym, gsym->ns))
1827 /* Resolve the gsymbol namespace if needed. */
1828 if (!gsym->ns->resolved)
1830 gfc_dt_list *old_dt_list;
1832 /* Stash away derived types so that the backend_decls do not
1834 old_dt_list = gfc_derived_types;
1835 gfc_derived_types = NULL;
1837 gfc_resolve (gsym->ns);
1839 /* Store the new derived types with the global namespace. */
1840 if (gfc_derived_types)
1841 gsym->ns->derived_types = gfc_derived_types;
1843 /* Restore the derived types of this namespace. */
1844 gfc_derived_types = old_dt_list;
1847 /* Make sure that translation for the gsymbol occurs before
1848 the procedure currently being resolved. */
1849 ns = gfc_global_ns_list;
1850 for (; ns && ns != gsym->ns; ns = ns->sibling)
1852 if (ns->sibling == gsym->ns)
1854 ns->sibling = gsym->ns->sibling;
1855 gsym->ns->sibling = gfc_global_ns_list;
1856 gfc_global_ns_list = gsym->ns;
1861 if (gsym->ns->proc_name->attr.function
1862 && gsym->ns->proc_name->as
1863 && gsym->ns->proc_name->as->rank
1864 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1865 gfc_error ("The reference to function '%s' at %L either needs an "
1866 "explicit INTERFACE or the rank is incorrect", sym->name,
1869 /* Non-assumed length character functions. */
1870 if (sym->attr.function && sym->ts.type == BT_CHARACTER
1871 && gsym->ns->proc_name->ts.u.cl->length != NULL)
1873 gfc_charlen *cl = sym->ts.u.cl;
1875 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1876 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1878 gfc_error ("Nonconstant character-length function '%s' at %L "
1879 "must have an explicit interface", sym->name,
1884 /* Differences in constant character lengths. */
1885 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
1887 long int l1 = 0, l2 = 0;
1888 gfc_charlen *cl1 = sym->ts.u.cl;
1889 gfc_charlen *cl2 = gsym->ns->proc_name->ts.u.cl;
1892 && cl1->length != NULL
1893 && cl1->length->expr_type == EXPR_CONSTANT)
1894 l1 = mpz_get_si (cl1->length->value.integer);
1897 && cl2->length != NULL
1898 && cl2->length->expr_type == EXPR_CONSTANT)
1899 l2 = mpz_get_si (cl2->length->value.integer);
1901 if (l1 && l2 && l1 != l2)
1902 gfc_error ("Character length mismatch in return type of "
1903 "function '%s' at %L (%ld/%ld)", sym->name,
1904 &sym->declared_at, l1, l2);
1907 /* Type mismatch of function return type and expected type. */
1908 if (sym->attr.function
1909 && !gfc_compare_types (&sym->ts, &gsym->ns->proc_name->ts))
1910 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
1911 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
1912 gfc_typename (&gsym->ns->proc_name->ts));
1914 /* Assumed shape arrays as dummy arguments. */
1915 if (gsym->ns->proc_name->formal)
1917 gfc_formal_arglist *arg = gsym->ns->proc_name->formal;
1918 for ( ; arg; arg = arg->next)
1919 if (arg->sym && arg->sym->as
1920 && arg->sym->as->type == AS_ASSUMED_SHAPE)
1922 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
1923 "'%s' argument must have an explicit interface",
1924 sym->name, &sym->declared_at, arg->sym->name);
1927 else if (arg->sym && arg->sym->attr.optional)
1929 gfc_error ("Procedure '%s' at %L with optional dummy argument "
1930 "'%s' must have an explicit interface",
1931 sym->name, &sym->declared_at, arg->sym->name);
1936 if (gfc_option.flag_whole_file == 1
1937 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1938 && !(gfc_option.warn_std & GFC_STD_GNU)))
1939 gfc_errors_to_warnings (1);
1941 gfc_procedure_use (gsym->ns->proc_name, actual, where);
1943 gfc_errors_to_warnings (0);
1946 if (gsym->type == GSYM_UNKNOWN)
1949 gsym->where = *where;
1956 /************* Function resolution *************/
1958 /* Resolve a function call known to be generic.
1959 Section 14.1.2.4.1. */
1962 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1966 if (sym->attr.generic)
1968 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1971 expr->value.function.name = s->name;
1972 expr->value.function.esym = s;
1974 if (s->ts.type != BT_UNKNOWN)
1976 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1977 expr->ts = s->result->ts;
1980 expr->rank = s->as->rank;
1981 else if (s->result != NULL && s->result->as != NULL)
1982 expr->rank = s->result->as->rank;
1984 gfc_set_sym_referenced (expr->value.function.esym);
1989 /* TODO: Need to search for elemental references in generic
1993 if (sym->attr.intrinsic)
1994 return gfc_intrinsic_func_interface (expr, 0);
2001 resolve_generic_f (gfc_expr *expr)
2006 sym = expr->symtree->n.sym;
2010 m = resolve_generic_f0 (expr, sym);
2013 else if (m == MATCH_ERROR)
2017 if (sym->ns->parent == NULL)
2019 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2023 if (!generic_sym (sym))
2027 /* Last ditch attempt. See if the reference is to an intrinsic
2028 that possesses a matching interface. 14.1.2.4 */
2029 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2031 gfc_error ("There is no specific function for the generic '%s' at %L",
2032 expr->symtree->n.sym->name, &expr->where);
2036 m = gfc_intrinsic_func_interface (expr, 0);
2040 gfc_error ("Generic function '%s' at %L is not consistent with a "
2041 "specific intrinsic interface", expr->symtree->n.sym->name,
2048 /* Resolve a function call known to be specific. */
2051 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2055 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2057 if (sym->attr.dummy)
2059 sym->attr.proc = PROC_DUMMY;
2063 sym->attr.proc = PROC_EXTERNAL;
2067 if (sym->attr.proc == PROC_MODULE
2068 || sym->attr.proc == PROC_ST_FUNCTION
2069 || sym->attr.proc == PROC_INTERNAL)
2072 if (sym->attr.intrinsic)
2074 m = gfc_intrinsic_func_interface (expr, 1);
2078 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2079 "with an intrinsic", sym->name, &expr->where);
2087 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2090 expr->ts = sym->result->ts;
2093 expr->value.function.name = sym->name;
2094 expr->value.function.esym = sym;
2095 if (sym->as != NULL)
2096 expr->rank = sym->as->rank;
2103 resolve_specific_f (gfc_expr *expr)
2108 sym = expr->symtree->n.sym;
2112 m = resolve_specific_f0 (sym, expr);
2115 if (m == MATCH_ERROR)
2118 if (sym->ns->parent == NULL)
2121 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2127 gfc_error ("Unable to resolve the specific function '%s' at %L",
2128 expr->symtree->n.sym->name, &expr->where);
2134 /* Resolve a procedure call not known to be generic nor specific. */
2137 resolve_unknown_f (gfc_expr *expr)
2142 sym = expr->symtree->n.sym;
2144 if (sym->attr.dummy)
2146 sym->attr.proc = PROC_DUMMY;
2147 expr->value.function.name = sym->name;
2151 /* See if we have an intrinsic function reference. */
2153 if (gfc_is_intrinsic (sym, 0, expr->where))
2155 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2160 /* The reference is to an external name. */
2162 sym->attr.proc = PROC_EXTERNAL;
2163 expr->value.function.name = sym->name;
2164 expr->value.function.esym = expr->symtree->n.sym;
2166 if (sym->as != NULL)
2167 expr->rank = sym->as->rank;
2169 /* Type of the expression is either the type of the symbol or the
2170 default type of the symbol. */
2173 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2175 if (sym->ts.type != BT_UNKNOWN)
2179 ts = gfc_get_default_type (sym->name, sym->ns);
2181 if (ts->type == BT_UNKNOWN)
2183 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2184 sym->name, &expr->where);
2195 /* Return true, if the symbol is an external procedure. */
2197 is_external_proc (gfc_symbol *sym)
2199 if (!sym->attr.dummy && !sym->attr.contained
2200 && !(sym->attr.intrinsic
2201 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2202 && sym->attr.proc != PROC_ST_FUNCTION
2203 && !sym->attr.use_assoc
2211 /* Figure out if a function reference is pure or not. Also set the name
2212 of the function for a potential error message. Return nonzero if the
2213 function is PURE, zero if not. */
2215 pure_stmt_function (gfc_expr *, gfc_symbol *);
2218 pure_function (gfc_expr *e, const char **name)
2224 if (e->symtree != NULL
2225 && e->symtree->n.sym != NULL
2226 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2227 return pure_stmt_function (e, e->symtree->n.sym);
2229 if (e->value.function.esym)
2231 pure = gfc_pure (e->value.function.esym);
2232 *name = e->value.function.esym->name;
2234 else if (e->value.function.isym)
2236 pure = e->value.function.isym->pure
2237 || e->value.function.isym->elemental;
2238 *name = e->value.function.isym->name;
2242 /* Implicit functions are not pure. */
2244 *name = e->value.function.name;
2252 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2253 int *f ATTRIBUTE_UNUSED)
2257 /* Don't bother recursing into other statement functions
2258 since they will be checked individually for purity. */
2259 if (e->expr_type != EXPR_FUNCTION
2261 || e->symtree->n.sym == sym
2262 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2265 return pure_function (e, &name) ? false : true;
2270 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2272 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2277 is_scalar_expr_ptr (gfc_expr *expr)
2279 gfc_try retval = SUCCESS;
2284 /* See if we have a gfc_ref, which means we have a substring, array
2285 reference, or a component. */
2286 if (expr->ref != NULL)
2289 while (ref->next != NULL)
2295 if (ref->u.ss.length != NULL
2296 && ref->u.ss.length->length != NULL
2298 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2300 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2302 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2303 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2304 if (end - start + 1 != 1)
2311 if (ref->u.ar.type == AR_ELEMENT)
2313 else if (ref->u.ar.type == AR_FULL)
2315 /* The user can give a full array if the array is of size 1. */
2316 if (ref->u.ar.as != NULL
2317 && ref->u.ar.as->rank == 1
2318 && ref->u.ar.as->type == AS_EXPLICIT
2319 && ref->u.ar.as->lower[0] != NULL
2320 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2321 && ref->u.ar.as->upper[0] != NULL
2322 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2324 /* If we have a character string, we need to check if
2325 its length is one. */
2326 if (expr->ts.type == BT_CHARACTER)
2328 if (expr->ts.u.cl == NULL
2329 || expr->ts.u.cl->length == NULL
2330 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2336 /* We have constant lower and upper bounds. If the
2337 difference between is 1, it can be considered a
2339 start = (int) mpz_get_si
2340 (ref->u.ar.as->lower[0]->value.integer);
2341 end = (int) mpz_get_si
2342 (ref->u.ar.as->upper[0]->value.integer);
2343 if (end - start + 1 != 1)
2358 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2360 /* Character string. Make sure it's of length 1. */
2361 if (expr->ts.u.cl == NULL
2362 || expr->ts.u.cl->length == NULL
2363 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2366 else if (expr->rank != 0)
2373 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2374 and, in the case of c_associated, set the binding label based on
2378 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2379 gfc_symbol **new_sym)
2381 char name[GFC_MAX_SYMBOL_LEN + 1];
2382 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2383 int optional_arg = 0, is_pointer = 0;
2384 gfc_try retval = SUCCESS;
2385 gfc_symbol *args_sym;
2386 gfc_typespec *arg_ts;
2388 if (args->expr->expr_type == EXPR_CONSTANT
2389 || args->expr->expr_type == EXPR_OP
2390 || args->expr->expr_type == EXPR_NULL)
2392 gfc_error ("Argument to '%s' at %L is not a variable",
2393 sym->name, &(args->expr->where));
2397 args_sym = args->expr->symtree->n.sym;
2399 /* The typespec for the actual arg should be that stored in the expr
2400 and not necessarily that of the expr symbol (args_sym), because
2401 the actual expression could be a part-ref of the expr symbol. */
2402 arg_ts = &(args->expr->ts);
2404 is_pointer = gfc_is_data_pointer (args->expr);
2406 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2408 /* If the user gave two args then they are providing something for
2409 the optional arg (the second cptr). Therefore, set the name and
2410 binding label to the c_associated for two cptrs. Otherwise,
2411 set c_associated to expect one cptr. */
2415 sprintf (name, "%s_2", sym->name);
2416 sprintf (binding_label, "%s_2", sym->binding_label);
2422 sprintf (name, "%s_1", sym->name);
2423 sprintf (binding_label, "%s_1", sym->binding_label);
2427 /* Get a new symbol for the version of c_associated that
2429 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2431 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2432 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2434 sprintf (name, "%s", sym->name);
2435 sprintf (binding_label, "%s", sym->binding_label);
2437 /* Error check the call. */
2438 if (args->next != NULL)
2440 gfc_error_now ("More actual than formal arguments in '%s' "
2441 "call at %L", name, &(args->expr->where));
2444 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2446 /* Make sure we have either the target or pointer attribute. */
2447 if (!args_sym->attr.target && !is_pointer)
2449 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2450 "a TARGET or an associated pointer",
2452 sym->name, &(args->expr->where));
2456 /* See if we have interoperable type and type param. */
2457 if (verify_c_interop (arg_ts) == SUCCESS
2458 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2460 if (args_sym->attr.target == 1)
2462 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2463 has the target attribute and is interoperable. */
2464 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2465 allocatable variable that has the TARGET attribute and
2466 is not an array of zero size. */
2467 if (args_sym->attr.allocatable == 1)
2469 if (args_sym->attr.dimension != 0
2470 && (args_sym->as && args_sym->as->rank == 0))
2472 gfc_error_now ("Allocatable variable '%s' used as a "
2473 "parameter to '%s' at %L must not be "
2474 "an array of zero size",
2475 args_sym->name, sym->name,
2476 &(args->expr->where));
2482 /* A non-allocatable target variable with C
2483 interoperable type and type parameters must be
2485 if (args_sym && args_sym->attr.dimension)
2487 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2489 gfc_error ("Assumed-shape array '%s' at %L "
2490 "cannot be an argument to the "
2491 "procedure '%s' because "
2492 "it is not C interoperable",
2494 &(args->expr->where), sym->name);
2497 else if (args_sym->as->type == AS_DEFERRED)
2499 gfc_error ("Deferred-shape array '%s' at %L "
2500 "cannot be an argument to the "
2501 "procedure '%s' because "
2502 "it is not C interoperable",
2504 &(args->expr->where), sym->name);
2509 /* Make sure it's not a character string. Arrays of
2510 any type should be ok if the variable is of a C
2511 interoperable type. */
2512 if (arg_ts->type == BT_CHARACTER)
2513 if (arg_ts->u.cl != NULL
2514 && (arg_ts->u.cl->length == NULL
2515 || arg_ts->u.cl->length->expr_type
2518 (arg_ts->u.cl->length->value.integer, 1)
2520 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2522 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2523 "at %L must have a length of 1",
2524 args_sym->name, sym->name,
2525 &(args->expr->where));
2531 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2533 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2535 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2536 "associated scalar POINTER", args_sym->name,
2537 sym->name, &(args->expr->where));
2543 /* The parameter is not required to be C interoperable. If it
2544 is not C interoperable, it must be a nonpolymorphic scalar
2545 with no length type parameters. It still must have either
2546 the pointer or target attribute, and it can be
2547 allocatable (but must be allocated when c_loc is called). */
2548 if (args->expr->rank != 0
2549 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2551 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2552 "scalar", args_sym->name, sym->name,
2553 &(args->expr->where));
2556 else if (arg_ts->type == BT_CHARACTER
2557 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2559 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2560 "%L must have a length of 1",
2561 args_sym->name, sym->name,
2562 &(args->expr->where));
2567 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2569 if (args_sym->attr.flavor != FL_PROCEDURE)
2571 /* TODO: Update this error message to allow for procedure
2572 pointers once they are implemented. */
2573 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2575 args_sym->name, sym->name,
2576 &(args->expr->where));
2579 else if (args_sym->attr.is_bind_c != 1)
2581 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2583 args_sym->name, sym->name,
2584 &(args->expr->where));
2589 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2594 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2595 "iso_c_binding function: '%s'!\n", sym->name);
2602 /* Resolve a function call, which means resolving the arguments, then figuring
2603 out which entity the name refers to. */
2604 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2605 to INTENT(OUT) or INTENT(INOUT). */
2608 resolve_function (gfc_expr *expr)
2610 gfc_actual_arglist *arg;
2615 procedure_type p = PROC_INTRINSIC;
2616 bool no_formal_args;
2620 sym = expr->symtree->n.sym;
2622 /* If this is a procedure pointer component, it has already been resolved. */
2623 if (gfc_is_proc_ptr_comp (expr, NULL))
2626 if (sym && sym->attr.intrinsic
2627 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2630 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2632 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2636 /* If this ia a deferred TBP with an abstract interface (which may
2637 of course be referenced), expr->value.function.esym will be set. */
2638 if (sym && sym->attr.abstract && !expr->value.function.esym)
2640 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2641 sym->name, &expr->where);
2645 /* Switch off assumed size checking and do this again for certain kinds
2646 of procedure, once the procedure itself is resolved. */
2647 need_full_assumed_size++;
2649 if (expr->symtree && expr->symtree->n.sym)
2650 p = expr->symtree->n.sym->attr.proc;
2652 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2653 inquiry_argument = true;
2654 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2656 if (resolve_actual_arglist (expr->value.function.actual,
2657 p, no_formal_args) == FAILURE)
2659 inquiry_argument = false;
2663 inquiry_argument = false;
2665 /* Need to setup the call to the correct c_associated, depending on
2666 the number of cptrs to user gives to compare. */
2667 if (sym && sym->attr.is_iso_c == 1)
2669 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2673 /* Get the symtree for the new symbol (resolved func).
2674 the old one will be freed later, when it's no longer used. */
2675 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2678 /* Resume assumed_size checking. */
2679 need_full_assumed_size--;
2681 /* If the procedure is external, check for usage. */
2682 if (sym && is_external_proc (sym))
2683 resolve_global_procedure (sym, &expr->where,
2684 &expr->value.function.actual, 0);
2686 if (sym && sym->ts.type == BT_CHARACTER
2688 && sym->ts.u.cl->length == NULL
2690 && expr->value.function.esym == NULL
2691 && !sym->attr.contained)
2693 /* Internal procedures are taken care of in resolve_contained_fntype. */
2694 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2695 "be used at %L since it is not a dummy argument",
2696 sym->name, &expr->where);
2700 /* See if function is already resolved. */
2702 if (expr->value.function.name != NULL)
2704 if (expr->ts.type == BT_UNKNOWN)
2710 /* Apply the rules of section 14.1.2. */
2712 switch (procedure_kind (sym))
2715 t = resolve_generic_f (expr);
2718 case PTYPE_SPECIFIC:
2719 t = resolve_specific_f (expr);
2723 t = resolve_unknown_f (expr);
2727 gfc_internal_error ("resolve_function(): bad function type");
2731 /* If the expression is still a function (it might have simplified),
2732 then we check to see if we are calling an elemental function. */
2734 if (expr->expr_type != EXPR_FUNCTION)
2737 temp = need_full_assumed_size;
2738 need_full_assumed_size = 0;
2740 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2743 if (omp_workshare_flag
2744 && expr->value.function.esym
2745 && ! gfc_elemental (expr->value.function.esym))
2747 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2748 "in WORKSHARE construct", expr->value.function.esym->name,
2753 #define GENERIC_ID expr->value.function.isym->id
2754 else if (expr->value.function.actual != NULL
2755 && expr->value.function.isym != NULL
2756 && GENERIC_ID != GFC_ISYM_LBOUND
2757 && GENERIC_ID != GFC_ISYM_LEN
2758 && GENERIC_ID != GFC_ISYM_LOC
2759 && GENERIC_ID != GFC_ISYM_PRESENT)
2761 /* Array intrinsics must also have the last upper bound of an
2762 assumed size array argument. UBOUND and SIZE have to be
2763 excluded from the check if the second argument is anything
2766 for (arg = expr->value.function.actual; arg; arg = arg->next)
2768 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2769 && arg->next != NULL && arg->next->expr)
2771 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2774 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2777 if ((int)mpz_get_si (arg->next->expr->value.integer)
2782 if (arg->expr != NULL
2783 && arg->expr->rank > 0
2784 && resolve_assumed_size_actual (arg->expr))
2790 need_full_assumed_size = temp;
2793 if (!pure_function (expr, &name) && name)
2797 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2798 "FORALL %s", name, &expr->where,
2799 forall_flag == 2 ? "mask" : "block");
2802 else if (gfc_pure (NULL))
2804 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2805 "procedure within a PURE procedure", name, &expr->where);
2810 /* Functions without the RECURSIVE attribution are not allowed to
2811 * call themselves. */
2812 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2815 esym = expr->value.function.esym;
2817 if (is_illegal_recursion (esym, gfc_current_ns))
2819 if (esym->attr.entry && esym->ns->entries)
2820 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2821 " function '%s' is not RECURSIVE",
2822 esym->name, &expr->where, esym->ns->entries->sym->name);
2824 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2825 " is not RECURSIVE", esym->name, &expr->where);
2831 /* Character lengths of use associated functions may contains references to
2832 symbols not referenced from the current program unit otherwise. Make sure
2833 those symbols are marked as referenced. */
2835 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2836 && expr->value.function.esym->attr.use_assoc)
2838 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2842 && !((expr->value.function.esym
2843 && expr->value.function.esym->attr.elemental)
2845 (expr->value.function.isym
2846 && expr->value.function.isym->elemental)))
2847 find_noncopying_intrinsics (expr->value.function.esym,
2848 expr->value.function.actual);
2850 /* Make sure that the expression has a typespec that works. */
2851 if (expr->ts.type == BT_UNKNOWN)
2853 if (expr->symtree->n.sym->result
2854 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2855 && !expr->symtree->n.sym->result->attr.proc_pointer)
2856 expr->ts = expr->symtree->n.sym->result->ts;
2863 /************* Subroutine resolution *************/
2866 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2872 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2873 sym->name, &c->loc);
2874 else if (gfc_pure (NULL))
2875 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2881 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2885 if (sym->attr.generic)
2887 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2890 c->resolved_sym = s;
2891 pure_subroutine (c, s);
2895 /* TODO: Need to search for elemental references in generic interface. */
2898 if (sym->attr.intrinsic)
2899 return gfc_intrinsic_sub_interface (c, 0);
2906 resolve_generic_s (gfc_code *c)
2911 sym = c->symtree->n.sym;
2915 m = resolve_generic_s0 (c, sym);
2918 else if (m == MATCH_ERROR)
2922 if (sym->ns->parent == NULL)
2924 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2928 if (!generic_sym (sym))
2932 /* Last ditch attempt. See if the reference is to an intrinsic
2933 that possesses a matching interface. 14.1.2.4 */
2934 sym = c->symtree->n.sym;
2936 if (!gfc_is_intrinsic (sym, 1, c->loc))
2938 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2939 sym->name, &c->loc);
2943 m = gfc_intrinsic_sub_interface (c, 0);
2947 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2948 "intrinsic subroutine interface", sym->name, &c->loc);
2954 /* Set the name and binding label of the subroutine symbol in the call
2955 expression represented by 'c' to include the type and kind of the
2956 second parameter. This function is for resolving the appropriate
2957 version of c_f_pointer() and c_f_procpointer(). For example, a
2958 call to c_f_pointer() for a default integer pointer could have a
2959 name of c_f_pointer_i4. If no second arg exists, which is an error
2960 for these two functions, it defaults to the generic symbol's name
2961 and binding label. */
2964 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2965 char *name, char *binding_label)
2967 gfc_expr *arg = NULL;
2971 /* The second arg of c_f_pointer and c_f_procpointer determines
2972 the type and kind for the procedure name. */
2973 arg = c->ext.actual->next->expr;
2977 /* Set up the name to have the given symbol's name,
2978 plus the type and kind. */
2979 /* a derived type is marked with the type letter 'u' */
2980 if (arg->ts.type == BT_DERIVED)
2983 kind = 0; /* set the kind as 0 for now */
2987 type = gfc_type_letter (arg->ts.type);
2988 kind = arg->ts.kind;
2991 if (arg->ts.type == BT_CHARACTER)
2992 /* Kind info for character strings not needed. */
2995 sprintf (name, "%s_%c%d", sym->name, type, kind);
2996 /* Set up the binding label as the given symbol's label plus
2997 the type and kind. */
2998 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3002 /* If the second arg is missing, set the name and label as
3003 was, cause it should at least be found, and the missing
3004 arg error will be caught by compare_parameters(). */
3005 sprintf (name, "%s", sym->name);
3006 sprintf (binding_label, "%s", sym->binding_label);
3013 /* Resolve a generic version of the iso_c_binding procedure given
3014 (sym) to the specific one based on the type and kind of the
3015 argument(s). Currently, this function resolves c_f_pointer() and
3016 c_f_procpointer based on the type and kind of the second argument
3017 (FPTR). Other iso_c_binding procedures aren't specially handled.
3018 Upon successfully exiting, c->resolved_sym will hold the resolved
3019 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3023 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3025 gfc_symbol *new_sym;
3026 /* this is fine, since we know the names won't use the max */
3027 char name[GFC_MAX_SYMBOL_LEN + 1];
3028 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3029 /* default to success; will override if find error */
3030 match m = MATCH_YES;
3032 /* Make sure the actual arguments are in the necessary order (based on the
3033 formal args) before resolving. */
3034 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3036 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3037 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3039 set_name_and_label (c, sym, name, binding_label);
3041 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3043 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3045 /* Make sure we got a third arg if the second arg has non-zero
3046 rank. We must also check that the type and rank are
3047 correct since we short-circuit this check in
3048 gfc_procedure_use() (called above to sort actual args). */
3049 if (c->ext.actual->next->expr->rank != 0)
3051 if(c->ext.actual->next->next == NULL
3052 || c->ext.actual->next->next->expr == NULL)
3055 gfc_error ("Missing SHAPE parameter for call to %s "
3056 "at %L", sym->name, &(c->loc));
3058 else if (c->ext.actual->next->next->expr->ts.type
3060 || c->ext.actual->next->next->expr->rank != 1)
3063 gfc_error ("SHAPE parameter for call to %s at %L must "
3064 "be a rank 1 INTEGER array", sym->name,
3071 if (m != MATCH_ERROR)
3073 /* the 1 means to add the optional arg to formal list */
3074 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3076 /* for error reporting, say it's declared where the original was */
3077 new_sym->declared_at = sym->declared_at;
3082 /* no differences for c_loc or c_funloc */
3086 /* set the resolved symbol */
3087 if (m != MATCH_ERROR)
3088 c->resolved_sym = new_sym;
3090 c->resolved_sym = sym;
3096 /* Resolve a subroutine call known to be specific. */
3099 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3103 if(sym->attr.is_iso_c)
3105 m = gfc_iso_c_sub_interface (c,sym);
3109 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3111 if (sym->attr.dummy)
3113 sym->attr.proc = PROC_DUMMY;
3117 sym->attr.proc = PROC_EXTERNAL;
3121 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3124 if (sym->attr.intrinsic)
3126 m = gfc_intrinsic_sub_interface (c, 1);
3130 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3131 "with an intrinsic", sym->name, &c->loc);
3139 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3141 c->resolved_sym = sym;
3142 pure_subroutine (c, sym);
3149 resolve_specific_s (gfc_code *c)
3154 sym = c->symtree->n.sym;
3158 m = resolve_specific_s0 (c, sym);
3161 if (m == MATCH_ERROR)
3164 if (sym->ns->parent == NULL)
3167 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3173 sym = c->symtree->n.sym;
3174 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3175 sym->name, &c->loc);
3181 /* Resolve a subroutine call not known to be generic nor specific. */
3184 resolve_unknown_s (gfc_code *c)
3188 sym = c->symtree->n.sym;
3190 if (sym->attr.dummy)
3192 sym->attr.proc = PROC_DUMMY;
3196 /* See if we have an intrinsic function reference. */
3198 if (gfc_is_intrinsic (sym, 1, c->loc))
3200 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3205 /* The reference is to an external name. */
3208 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3210 c->resolved_sym = sym;
3212 pure_subroutine (c, sym);
3218 /* Resolve a subroutine call. Although it was tempting to use the same code
3219 for functions, subroutines and functions are stored differently and this
3220 makes things awkward. */
3223 resolve_call (gfc_code *c)
3226 procedure_type ptype = PROC_INTRINSIC;
3227 gfc_symbol *csym, *sym;
3228 bool no_formal_args;
3230 csym = c->symtree ? c->symtree->n.sym : NULL;
3232 if (csym && csym->ts.type != BT_UNKNOWN)
3234 gfc_error ("'%s' at %L has a type, which is not consistent with "
3235 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3239 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3242 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3243 sym = st ? st->n.sym : NULL;
3244 if (sym && csym != sym
3245 && sym->ns == gfc_current_ns
3246 && sym->attr.flavor == FL_PROCEDURE
3247 && sym->attr.contained)
3250 if (csym->attr.generic)
3251 c->symtree->n.sym = sym;
3254 csym = c->symtree->n.sym;
3258 /* If this ia a deferred TBP with an abstract interface
3259 (which may of course be referenced), c->expr1 will be set. */
3260 if (csym && csym->attr.abstract && !c->expr1)
3262 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3263 csym->name, &c->loc);
3267 /* Subroutines without the RECURSIVE attribution are not allowed to
3268 * call themselves. */
3269 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3271 if (csym->attr.entry && csym->ns->entries)
3272 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3273 " subroutine '%s' is not RECURSIVE",
3274 csym->name, &c->loc, csym->ns->entries->sym->name);
3276 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3277 " is not RECURSIVE", csym->name, &c->loc);
3282 /* Switch off assumed size checking and do this again for certain kinds
3283 of procedure, once the procedure itself is resolved. */
3284 need_full_assumed_size++;
3287 ptype = csym->attr.proc;
3289 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3290 if (resolve_actual_arglist (c->ext.actual, ptype,
3291 no_formal_args) == FAILURE)
3294 /* Resume assumed_size checking. */
3295 need_full_assumed_size--;
3297 /* If external, check for usage. */
3298 if (csym && is_external_proc (csym))
3299 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3302 if (c->resolved_sym == NULL)
3304 c->resolved_isym = NULL;
3305 switch (procedure_kind (csym))
3308 t = resolve_generic_s (c);
3311 case PTYPE_SPECIFIC:
3312 t = resolve_specific_s (c);
3316 t = resolve_unknown_s (c);
3320 gfc_internal_error ("resolve_subroutine(): bad function type");
3324 /* Some checks of elemental subroutine actual arguments. */
3325 if (resolve_elemental_actual (NULL, c) == FAILURE)
3328 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3329 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3334 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3335 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3336 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3337 if their shapes do not match. If either op1->shape or op2->shape is
3338 NULL, return SUCCESS. */
3341 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3348 if (op1->shape != NULL && op2->shape != NULL)
3350 for (i = 0; i < op1->rank; i++)
3352 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3354 gfc_error ("Shapes for operands at %L and %L are not conformable",
3355 &op1->where, &op2->where);
3366 /* Resolve an operator expression node. This can involve replacing the
3367 operation with a user defined function call. */
3370 resolve_operator (gfc_expr *e)
3372 gfc_expr *op1, *op2;
3374 bool dual_locus_error;
3377 /* Resolve all subnodes-- give them types. */
3379 switch (e->value.op.op)
3382 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3385 /* Fall through... */
3388 case INTRINSIC_UPLUS:
3389 case INTRINSIC_UMINUS:
3390 case INTRINSIC_PARENTHESES:
3391 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3396 /* Typecheck the new node. */
3398 op1 = e->value.op.op1;
3399 op2 = e->value.op.op2;
3400 dual_locus_error = false;
3402 if ((op1 && op1->expr_type == EXPR_NULL)
3403 || (op2 && op2->expr_type == EXPR_NULL))
3405 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3409 switch (e->value.op.op)
3411 case INTRINSIC_UPLUS:
3412 case INTRINSIC_UMINUS:
3413 if (op1->ts.type == BT_INTEGER
3414 || op1->ts.type == BT_REAL
3415 || op1->ts.type == BT_COMPLEX)
3421 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3422 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3425 case INTRINSIC_PLUS:
3426 case INTRINSIC_MINUS:
3427 case INTRINSIC_TIMES:
3428 case INTRINSIC_DIVIDE:
3429 case INTRINSIC_POWER:
3430 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3432 gfc_type_convert_binary (e, 1);
3437 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3438 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3439 gfc_typename (&op2->ts));
3442 case INTRINSIC_CONCAT:
3443 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3444 && op1->ts.kind == op2->ts.kind)
3446 e->ts.type = BT_CHARACTER;
3447 e->ts.kind = op1->ts.kind;
3452 _("Operands of string concatenation operator at %%L are %s/%s"),
3453 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3459 case INTRINSIC_NEQV:
3460 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3462 e->ts.type = BT_LOGICAL;
3463 e->ts.kind = gfc_kind_max (op1, op2);
3464 if (op1->ts.kind < e->ts.kind)
3465 gfc_convert_type (op1, &e->ts, 2);
3466 else if (op2->ts.kind < e->ts.kind)
3467 gfc_convert_type (op2, &e->ts, 2);
3471 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3472 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3473 gfc_typename (&op2->ts));
3478 if (op1->ts.type == BT_LOGICAL)
3480 e->ts.type = BT_LOGICAL;
3481 e->ts.kind = op1->ts.kind;
3485 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3486 gfc_typename (&op1->ts));
3490 case INTRINSIC_GT_OS:
3492 case INTRINSIC_GE_OS:
3494 case INTRINSIC_LT_OS:
3496 case INTRINSIC_LE_OS:
3497 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3499 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3503 /* Fall through... */
3506 case INTRINSIC_EQ_OS:
3508 case INTRINSIC_NE_OS:
3509 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3510 && op1->ts.kind == op2->ts.kind)
3512 e->ts.type = BT_LOGICAL;
3513 e->ts.kind = gfc_default_logical_kind;
3517 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3519 gfc_type_convert_binary (e, 1);
3521 e->ts.type = BT_LOGICAL;
3522 e->ts.kind = gfc_default_logical_kind;
3526 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3528 _("Logicals at %%L must be compared with %s instead of %s"),
3529 (e->value.op.op == INTRINSIC_EQ
3530 || e->value.op.op == INTRINSIC_EQ_OS)
3531 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3534 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3535 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3536 gfc_typename (&op2->ts));
3540 case INTRINSIC_USER:
3541 if (e->value.op.uop->op == NULL)
3542 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3543 else if (op2 == NULL)
3544 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3545 e->value.op.uop->name, gfc_typename (&op1->ts));
3547 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3548 e->value.op.uop->name, gfc_typename (&op1->ts),
3549 gfc_typename (&op2->ts));
3553 case INTRINSIC_PARENTHESES:
3555 if (e->ts.type == BT_CHARACTER)
3556 e->ts.u.cl = op1->ts.u.cl;
3560 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3563 /* Deal with arrayness of an operand through an operator. */
3567 switch (e->value.op.op)
3569 case INTRINSIC_PLUS:
3570 case INTRINSIC_MINUS:
3571 case INTRINSIC_TIMES:
3572 case INTRINSIC_DIVIDE:
3573 case INTRINSIC_POWER:
3574 case INTRINSIC_CONCAT:
3578 case INTRINSIC_NEQV:
3580 case INTRINSIC_EQ_OS:
3582 case INTRINSIC_NE_OS:
3584 case INTRINSIC_GT_OS:
3586 case INTRINSIC_GE_OS:
3588 case INTRINSIC_LT_OS:
3590 case INTRINSIC_LE_OS:
3592 if (op1->rank == 0 && op2->rank == 0)
3595 if (op1->rank == 0 && op2->rank != 0)
3597 e->rank = op2->rank;
3599 if (e->shape == NULL)
3600 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3603 if (op1->rank != 0 && op2->rank == 0)
3605 e->rank = op1->rank;
3607 if (e->shape == NULL)
3608 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3611 if (op1->rank != 0 && op2->rank != 0)
3613 if (op1->rank == op2->rank)
3615 e->rank = op1->rank;
3616 if (e->shape == NULL)
3618 t = compare_shapes(op1, op2);
3622 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3627 /* Allow higher level expressions to work. */
3630 /* Try user-defined operators, and otherwise throw an error. */
3631 dual_locus_error = true;
3633 _("Inconsistent ranks for operator at %%L and %%L"));
3640 case INTRINSIC_PARENTHESES:
3642 case INTRINSIC_UPLUS:
3643 case INTRINSIC_UMINUS:
3644 /* Simply copy arrayness attribute */
3645 e->rank = op1->rank;
3647 if (e->shape == NULL)
3648 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3656 /* Attempt to simplify the expression. */
3659 t = gfc_simplify_expr (e, 0);
3660 /* Some calls do not succeed in simplification and return FAILURE
3661 even though there is no error; e.g. variable references to
3662 PARAMETER arrays. */
3663 if (!gfc_is_constant_expr (e))
3672 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3679 if (dual_locus_error)
3680 gfc_error (msg, &op1->where, &op2->where);
3682 gfc_error (msg, &e->where);
3688 /************** Array resolution subroutines **************/
3691 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3694 /* Compare two integer expressions. */
3697 compare_bound (gfc_expr *a, gfc_expr *b)
3701 if (a == NULL || a->expr_type != EXPR_CONSTANT
3702 || b == NULL || b->expr_type != EXPR_CONSTANT)
3705 /* If either of the types isn't INTEGER, we must have
3706 raised an error earlier. */
3708 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3711 i = mpz_cmp (a->value.integer, b->value.integer);
3721 /* Compare an integer expression with an integer. */
3724 compare_bound_int (gfc_expr *a, int b)
3728 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3731 if (a->ts.type != BT_INTEGER)
3732 gfc_internal_error ("compare_bound_int(): Bad expression");
3734 i = mpz_cmp_si (a->value.integer, b);
3744 /* Compare an integer expression with a mpz_t. */
3747 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3751 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3754 if (a->ts.type != BT_INTEGER)
3755 gfc_internal_error ("compare_bound_int(): Bad expression");
3757 i = mpz_cmp (a->value.integer, b);
3767 /* Compute the last value of a sequence given by a triplet.
3768 Return 0 if it wasn't able to compute the last value, or if the
3769 sequence if empty, and 1 otherwise. */
3772 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3773 gfc_expr *stride, mpz_t last)
3777 if (start == NULL || start->expr_type != EXPR_CONSTANT
3778 || end == NULL || end->expr_type != EXPR_CONSTANT
3779 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3782 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3783 || (stride != NULL && stride->ts.type != BT_INTEGER))
3786 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3788 if (compare_bound (start, end) == CMP_GT)
3790 mpz_set (last, end->value.integer);
3794 if (compare_bound_int (stride, 0) == CMP_GT)
3796 /* Stride is positive */
3797 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3802 /* Stride is negative */
3803 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3808 mpz_sub (rem, end->value.integer, start->value.integer);
3809 mpz_tdiv_r (rem, rem, stride->value.integer);
3810 mpz_sub (last, end->value.integer, rem);
3817 /* Compare a single dimension of an array reference to the array
3821 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3825 if (ar->dimen_type[i] == DIMEN_STAR)
3827 gcc_assert (ar->stride[i] == NULL);
3828 /* This implies [*] as [*:] and [*:3] are not possible. */
3829 if (ar->start[i] == NULL)
3831 gcc_assert (ar->end[i] == NULL);
3836 /* Given start, end and stride values, calculate the minimum and
3837 maximum referenced indexes. */
3839 switch (ar->dimen_type[i])
3846 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3849 gfc_warning ("Array reference at %L is out of bounds "
3850 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3851 mpz_get_si (ar->start[i]->value.integer),
3852 mpz_get_si (as->lower[i]->value.integer), i+1);
3854 gfc_warning ("Array reference at %L is out of bounds "
3855 "(%ld < %ld) in codimension %d", &ar->c_where[i],
3856 mpz_get_si (ar->start[i]->value.integer),
3857 mpz_get_si (as->lower[i]->value.integer),
3861 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3864 gfc_warning ("Array reference at %L is out of bounds "
3865 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3866 mpz_get_si (ar->start[i]->value.integer),
3867 mpz_get_si (as->upper[i]->value.integer), i+1);
3869 gfc_warning ("Array reference at %L is out of bounds "
3870 "(%ld > %ld) in codimension %d", &ar->c_where[i],
3871 mpz_get_si (ar->start[i]->value.integer),
3872 mpz_get_si (as->upper[i]->value.integer),
3881 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3882 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3884 comparison comp_start_end = compare_bound (AR_START, AR_END);
3886 /* Check for zero stride, which is not allowed. */
3887 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3889 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3893 /* if start == len || (stride > 0 && start < len)
3894 || (stride < 0 && start > len),
3895 then the array section contains at least one element. In this
3896 case, there is an out-of-bounds access if
3897 (start < lower || start > upper). */
3898 if (compare_bound (AR_START, AR_END) == CMP_EQ
3899 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3900 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3901 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3902 && comp_start_end == CMP_GT))
3904 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3906 gfc_warning ("Lower array reference at %L is out of bounds "
3907 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3908 mpz_get_si (AR_START->value.integer),
3909 mpz_get_si (as->lower[i]->value.integer), i+1);
3912 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3914 gfc_warning ("Lower array reference at %L is out of bounds "
3915 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3916 mpz_get_si (AR_START->value.integer),
3917 mpz_get_si (as->upper[i]->value.integer), i+1);
3922 /* If we can compute the highest index of the array section,
3923 then it also has to be between lower and upper. */
3924 mpz_init (last_value);
3925 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3928 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3930 gfc_warning ("Upper array reference at %L is out of bounds "
3931 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3932 mpz_get_si (last_value),
3933 mpz_get_si (as->lower[i]->value.integer), i+1);
3934 mpz_clear (last_value);
3937 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3939 gfc_warning ("Upper array reference at %L is out of bounds "
3940 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3941 mpz_get_si (last_value),
3942 mpz_get_si (as->upper[i]->value.integer), i+1);
3943 mpz_clear (last_value);
3947 mpz_clear (last_value);
3955 gfc_internal_error ("check_dimension(): Bad array reference");
3962 /* Compare an array reference with an array specification. */
3965 compare_spec_to_ref (gfc_array_ref *ar)
3972 /* TODO: Full array sections are only allowed as actual parameters. */
3973 if (as->type == AS_ASSUMED_SIZE
3974 && (/*ar->type == AR_FULL
3975 ||*/ (ar->type == AR_SECTION
3976 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3978 gfc_error ("Rightmost upper bound of assumed size array section "
3979 "not specified at %L", &ar->where);
3983 if (ar->type == AR_FULL)
3986 if (as->rank != ar->dimen)
3988 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3989 &ar->where, ar->dimen, as->rank);
3993 /* ar->codimen == 0 is a local array. */
3994 if (as->corank != ar->codimen && ar->codimen != 0)
3996 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
3997 &ar->where, ar->codimen, as->corank);
4001 for (i = 0; i < as->rank; i++)
4002 if (check_dimension (i, ar, as) == FAILURE)
4005 /* Local access has no coarray spec. */
4006 if (ar->codimen != 0)
4007 for (i = as->rank; i < as->rank + as->corank; i++)
4009 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate)
4011 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4012 i + 1 - as->rank, &ar->where);
4015 if (check_dimension (i, ar, as) == FAILURE)
4023 /* Resolve one part of an array index. */
4026 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4027 int force_index_integer_kind)
4034 if (gfc_resolve_expr (index) == FAILURE)
4037 if (check_scalar && index->rank != 0)
4039 gfc_error ("Array index at %L must be scalar", &index->where);
4043 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4045 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4046 &index->where, gfc_basic_typename (index->ts.type));
4050 if (index->ts.type == BT_REAL)
4051 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4052 &index->where) == FAILURE)
4055 if ((index->ts.kind != gfc_index_integer_kind
4056 && force_index_integer_kind)
4057 || index->ts.type != BT_INTEGER)
4060 ts.type = BT_INTEGER;
4061 ts.kind = gfc_index_integer_kind;
4063 gfc_convert_type_warn (index, &ts, 2, 0);
4069 /* Resolve one part of an array index. */
4072 gfc_resolve_index (gfc_expr *index, int check_scalar)
4074 return gfc_resolve_index_1 (index, check_scalar, 1);
4077 /* Resolve a dim argument to an intrinsic function. */
4080 gfc_resolve_dim_arg (gfc_expr *dim)
4085 if (gfc_resolve_expr (dim) == FAILURE)
4090 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4095 if (dim->ts.type != BT_INTEGER)
4097 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4101 if (dim->ts.kind != gfc_index_integer_kind)
4106 ts.type = BT_INTEGER;
4107 ts.kind = gfc_index_integer_kind;
4109 gfc_convert_type_warn (dim, &ts, 2, 0);
4115 /* Given an expression that contains array references, update those array
4116 references to point to the right array specifications. While this is
4117 filled in during matching, this information is difficult to save and load
4118 in a module, so we take care of it here.
4120 The idea here is that the original array reference comes from the
4121 base symbol. We traverse the list of reference structures, setting
4122 the stored reference to references. Component references can
4123 provide an additional array specification. */
4126 find_array_spec (gfc_expr *e)
4130 gfc_symbol *derived;
4133 if (e->symtree->n.sym->ts.type == BT_CLASS)
4134 as = CLASS_DATA (e->symtree->n.sym)->as;
4136 as = e->symtree->n.sym->as;
4139 for (ref = e->ref; ref; ref = ref->next)
4144 gfc_internal_error ("find_array_spec(): Missing spec");
4151 if (derived == NULL)
4152 derived = e->symtree->n.sym->ts.u.derived;
4154 if (derived->attr.is_class)
4155 derived = derived->components->ts.u.derived;
4157 c = derived->components;
4159 for (; c; c = c->next)
4160 if (c == ref->u.c.component)
4162 /* Track the sequence of component references. */
4163 if (c->ts.type == BT_DERIVED)
4164 derived = c->ts.u.derived;
4169 gfc_internal_error ("find_array_spec(): Component not found");
4171 if (c->attr.dimension)
4174 gfc_internal_error ("find_array_spec(): unused as(1)");
4185 gfc_internal_error ("find_array_spec(): unused as(2)");
4189 /* Resolve an array reference. */
4192 resolve_array_ref (gfc_array_ref *ar)
4194 int i, check_scalar;
4197 for (i = 0; i < ar->dimen + ar->codimen; i++)
4199 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4201 /* Do not force gfc_index_integer_kind for the start. We can
4202 do fine with any integer kind. This avoids temporary arrays
4203 created for indexing with a vector. */
4204 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4206 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4208 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4213 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4217 ar->dimen_type[i] = DIMEN_ELEMENT;
4221 ar->dimen_type[i] = DIMEN_VECTOR;
4222 if (e->expr_type == EXPR_VARIABLE
4223 && e->symtree->n.sym->ts.type == BT_DERIVED)
4224 ar->start[i] = gfc_get_parentheses (e);
4228 gfc_error ("Array index at %L is an array of rank %d",
4229 &ar->c_where[i], e->rank);
4234 if (ar->type == AR_FULL && ar->as->rank == 0)
4235 ar->type = AR_ELEMENT;
4237 /* If the reference type is unknown, figure out what kind it is. */
4239 if (ar->type == AR_UNKNOWN)
4241 ar->type = AR_ELEMENT;
4242 for (i = 0; i < ar->dimen; i++)
4243 if (ar->dimen_type[i] == DIMEN_RANGE
4244 || ar->dimen_type[i] == DIMEN_VECTOR)
4246 ar->type = AR_SECTION;
4251 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4259 resolve_substring (gfc_ref *ref)
4261 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4263 if (ref->u.ss.start != NULL)
4265 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4268 if (ref->u.ss.start->ts.type != BT_INTEGER)
4270 gfc_error ("Substring start index at %L must be of type INTEGER",
4271 &ref->u.ss.start->where);
4275 if (ref->u.ss.start->rank != 0)
4277 gfc_error ("Substring start index at %L must be scalar",
4278 &ref->u.ss.start->where);
4282 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4283 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4284 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4286 gfc_error ("Substring start index at %L is less than one",
4287 &ref->u.ss.start->where);
4292 if (ref->u.ss.end != NULL)
4294 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4297 if (ref->u.ss.end->ts.type != BT_INTEGER)
4299 gfc_error ("Substring end index at %L must be of type INTEGER",
4300 &ref->u.ss.end->where);
4304 if (ref->u.ss.end->rank != 0)
4306 gfc_error ("Substring end index at %L must be scalar",
4307 &ref->u.ss.end->where);
4311 if (ref->u.ss.length != NULL
4312 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4313 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4314 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4316 gfc_error ("Substring end index at %L exceeds the string length",
4317 &ref->u.ss.start->where);
4321 if (compare_bound_mpz_t (ref->u.ss.end,
4322 gfc_integer_kinds[k].huge) == CMP_GT
4323 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4324 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4326 gfc_error ("Substring end index at %L is too large",
4327 &ref->u.ss.end->where);
4336 /* This function supplies missing substring charlens. */
4339 gfc_resolve_substring_charlen (gfc_expr *e)
4342 gfc_expr *start, *end;
4344 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4345 if (char_ref->type == REF_SUBSTRING)
4351 gcc_assert (char_ref->next == NULL);
4355 if (e->ts.u.cl->length)
4356 gfc_free_expr (e->ts.u.cl->length);
4357 else if (e->expr_type == EXPR_VARIABLE
4358 && e->symtree->n.sym->attr.dummy)
4362 e->ts.type = BT_CHARACTER;
4363 e->ts.kind = gfc_default_character_kind;
4366 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4368 if (char_ref->u.ss.start)
4369 start = gfc_copy_expr (char_ref->u.ss.start);
4371 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4373 if (char_ref->u.ss.end)
4374 end = gfc_copy_expr (char_ref->u.ss.end);
4375 else if (e->expr_type == EXPR_VARIABLE)
4376 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4383 /* Length = (end - start +1). */
4384 e->ts.u.cl->length = gfc_subtract (end, start);
4385 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4386 gfc_get_int_expr (gfc_default_integer_kind,
4389 e->ts.u.cl->length->ts.type = BT_INTEGER;
4390 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4392 /* Make sure that the length is simplified. */
4393 gfc_simplify_expr (e->ts.u.cl->length, 1);
4394 gfc_resolve_expr (e->ts.u.cl->length);
4398 /* Resolve subtype references. */
4401 resolve_ref (gfc_expr *expr)
4403 int current_part_dimension, n_components, seen_part_dimension;
4406 for (ref = expr->ref; ref; ref = ref->next)
4407 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4409 find_array_spec (expr);
4413 for (ref = expr->ref; ref; ref = ref->next)
4417 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4425 resolve_substring (ref);
4429 /* Check constraints on part references. */
4431 current_part_dimension = 0;
4432 seen_part_dimension = 0;
4435 for (ref = expr->ref; ref; ref = ref->next)
4440 switch (ref->u.ar.type)
4443 /* Coarray scalar. */
4444 if (ref->u.ar.as->rank == 0)
4446 current_part_dimension = 0;
4451 current_part_dimension = 1;
4455 current_part_dimension = 0;
4459 gfc_internal_error ("resolve_ref(): Bad array reference");
4465 if (current_part_dimension || seen_part_dimension)
4468 if (ref->u.c.component->attr.pointer
4469 || ref->u.c.component->attr.proc_pointer)
4471 gfc_error ("Component to the right of a part reference "
4472 "with nonzero rank must not have the POINTER "
4473 "attribute at %L", &expr->where);
4476 else if (ref->u.c.component->attr.allocatable)
4478 gfc_error ("Component to the right of a part reference "
4479 "with nonzero rank must not have the ALLOCATABLE "
4480 "attribute at %L", &expr->where);
4492 if (((ref->type == REF_COMPONENT && n_components > 1)
4493 || ref->next == NULL)
4494 && current_part_dimension
4495 && seen_part_dimension)
4497 gfc_error ("Two or more part references with nonzero rank must "
4498 "not be specified at %L", &expr->where);
4502 if (ref->type == REF_COMPONENT)
4504 if (current_part_dimension)
4505 seen_part_dimension = 1;
4507 /* reset to make sure */
4508 current_part_dimension = 0;
4516 /* Given an expression, determine its shape. This is easier than it sounds.
4517 Leaves the shape array NULL if it is not possible to determine the shape. */
4520 expression_shape (gfc_expr *e)
4522 mpz_t array[GFC_MAX_DIMENSIONS];
4525 if (e->rank == 0 || e->shape != NULL)
4528 for (i = 0; i < e->rank; i++)
4529 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4532 e->shape = gfc_get_shape (e->rank);
4534 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4539 for (i--; i >= 0; i--)
4540 mpz_clear (array[i]);
4544 /* Given a variable expression node, compute the rank of the expression by
4545 examining the base symbol and any reference structures it may have. */
4548 expression_rank (gfc_expr *e)
4553 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4554 could lead to serious confusion... */
4555 gcc_assert (e->expr_type != EXPR_COMPCALL);
4559 if (e->expr_type == EXPR_ARRAY)
4561 /* Constructors can have a rank different from one via RESHAPE(). */
4563 if (e->symtree == NULL)
4569 e->rank = (e->symtree->n.sym->as == NULL)
4570 ? 0 : e->symtree->n.sym->as->rank;
4576 for (ref = e->ref; ref; ref = ref->next)
4578 if (ref->type != REF_ARRAY)
4581 if (ref->u.ar.type == AR_FULL)
4583 rank = ref->u.ar.as->rank;
4587 if (ref->u.ar.type == AR_SECTION)
4589 /* Figure out the rank of the section. */
4591 gfc_internal_error ("expression_rank(): Two array specs");
4593 for (i = 0; i < ref->u.ar.dimen; i++)
4594 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4595 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4605 expression_shape (e);
4609 /* Resolve a variable expression. */
4612 resolve_variable (gfc_expr *e)
4619 if (e->symtree == NULL)
4622 if (e->ref && resolve_ref (e) == FAILURE)
4625 sym = e->symtree->n.sym;
4626 if (sym->attr.flavor == FL_PROCEDURE
4627 && (!sym->attr.function
4628 || (sym->attr.function && sym->result
4629 && sym->result->attr.proc_pointer
4630 && !sym->result->attr.function)))
4632 e->ts.type = BT_PROCEDURE;
4633 goto resolve_procedure;
4636 if (sym->ts.type != BT_UNKNOWN)
4637 gfc_variable_attr (e, &e->ts);
4640 /* Must be a simple variable reference. */
4641 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4646 if (check_assumed_size_reference (sym, e))
4649 /* Deal with forward references to entries during resolve_code, to
4650 satisfy, at least partially, 12.5.2.5. */
4651 if (gfc_current_ns->entries
4652 && current_entry_id == sym->entry_id
4655 && cs_base->current->op != EXEC_ENTRY)
4657 gfc_entry_list *entry;
4658 gfc_formal_arglist *formal;
4662 /* If the symbol is a dummy... */
4663 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4665 entry = gfc_current_ns->entries;
4668 /* ...test if the symbol is a parameter of previous entries. */
4669 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4670 for (formal = entry->sym->formal; formal; formal = formal->next)
4672 if (formal->sym && sym->name == formal->sym->name)
4676 /* If it has not been seen as a dummy, this is an error. */
4679 if (specification_expr)
4680 gfc_error ("Variable '%s', used in a specification expression"
4681 ", is referenced at %L before the ENTRY statement "
4682 "in which it is a parameter",
4683 sym->name, &cs_base->current->loc);
4685 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4686 "statement in which it is a parameter",
4687 sym->name, &cs_base->current->loc);
4692 /* Now do the same check on the specification expressions. */
4693 specification_expr = 1;
4694 if (sym->ts.type == BT_CHARACTER
4695 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4699 for (n = 0; n < sym->as->rank; n++)
4701 specification_expr = 1;
4702 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4704 specification_expr = 1;
4705 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4708 specification_expr = 0;
4711 /* Update the symbol's entry level. */
4712 sym->entry_id = current_entry_id + 1;
4716 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4719 /* F2008, C617 and C1229. */
4720 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
4721 && gfc_is_coindexed (e))
4723 gfc_ref *ref, *ref2 = NULL;
4725 if (e->ts.type == BT_CLASS)
4727 gfc_error ("Polymorphic subobject of coindexed object at %L",
4732 for (ref = e->ref; ref; ref = ref->next)
4734 if (ref->type == REF_COMPONENT)
4736 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4740 for ( ; ref; ref = ref->next)
4741 if (ref->type == REF_COMPONENT)
4744 /* Expression itself is coindexed object. */
4748 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
4749 for ( ; c; c = c->next)
4750 if (c->attr.allocatable && c->ts.type == BT_CLASS)
4752 gfc_error ("Coindexed object with polymorphic allocatable "
4753 "subcomponent at %L", &e->where);
4764 /* Checks to see that the correct symbol has been host associated.
4765 The only situation where this arises is that in which a twice
4766 contained function is parsed after the host association is made.
4767 Therefore, on detecting this, change the symbol in the expression
4768 and convert the array reference into an actual arglist if the old
4769 symbol is a variable. */
4771 check_host_association (gfc_expr *e)
4773 gfc_symbol *sym, *old_sym;
4777 gfc_actual_arglist *arg, *tail = NULL;
4778 bool retval = e->expr_type == EXPR_FUNCTION;
4780 /* If the expression is the result of substitution in
4781 interface.c(gfc_extend_expr) because there is no way in
4782 which the host association can be wrong. */
4783 if (e->symtree == NULL
4784 || e->symtree->n.sym == NULL
4785 || e->user_operator)
4788 old_sym = e->symtree->n.sym;
4790 if (gfc_current_ns->parent
4791 && old_sym->ns != gfc_current_ns)
4793 /* Use the 'USE' name so that renamed module symbols are
4794 correctly handled. */
4795 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4797 if (sym && old_sym != sym
4798 && sym->ts.type == old_sym->ts.type
4799 && sym->attr.flavor == FL_PROCEDURE
4800 && sym->attr.contained)
4802 /* Clear the shape, since it might not be valid. */
4803 if (e->shape != NULL)
4805 for (n = 0; n < e->rank; n++)
4806 mpz_clear (e->shape[n]);
4808 gfc_free (e->shape);
4811 /* Give the expression the right symtree! */
4812 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4813 gcc_assert (st != NULL);
4815 if (old_sym->attr.flavor == FL_PROCEDURE
4816 || e->expr_type == EXPR_FUNCTION)
4818 /* Original was function so point to the new symbol, since
4819 the actual argument list is already attached to the
4821 e->value.function.esym = NULL;
4826 /* Original was variable so convert array references into
4827 an actual arglist. This does not need any checking now
4828 since gfc_resolve_function will take care of it. */
4829 e->value.function.actual = NULL;
4830 e->expr_type = EXPR_FUNCTION;
4833 /* Ambiguity will not arise if the array reference is not
4834 the last reference. */
4835 for (ref = e->ref; ref; ref = ref->next)
4836 if (ref->type == REF_ARRAY && ref->next == NULL)
4839 gcc_assert (ref->type == REF_ARRAY);
4841 /* Grab the start expressions from the array ref and
4842 copy them into actual arguments. */
4843 for (n = 0; n < ref->u.ar.dimen; n++)
4845 arg = gfc_get_actual_arglist ();
4846 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4847 if (e->value.function.actual == NULL)
4848 tail = e->value.function.actual = arg;
4856 /* Dump the reference list and set the rank. */
4857 gfc_free_ref_list (e->ref);
4859 e->rank = sym->as ? sym->as->rank : 0;
4862 gfc_resolve_expr (e);
4866 /* This might have changed! */
4867 return e->expr_type == EXPR_FUNCTION;
4872 gfc_resolve_character_operator (gfc_expr *e)
4874 gfc_expr *op1 = e->value.op.op1;
4875 gfc_expr *op2 = e->value.op.op2;
4876 gfc_expr *e1 = NULL;
4877 gfc_expr *e2 = NULL;
4879 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4881 if (op1->ts.u.cl && op1->ts.u.cl->length)
4882 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4883 else if (op1->expr_type == EXPR_CONSTANT)
4884 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4885 op1->value.character.length);
4887 if (op2->ts.u.cl && op2->ts.u.cl->length)
4888 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4889 else if (op2->expr_type == EXPR_CONSTANT)
4890 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4891 op2->value.character.length);
4893 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4898 e->ts.u.cl->length = gfc_add (e1, e2);
4899 e->ts.u.cl->length->ts.type = BT_INTEGER;
4900 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4901 gfc_simplify_expr (e->ts.u.cl->length, 0);
4902 gfc_resolve_expr (e->ts.u.cl->length);
4908 /* Ensure that an character expression has a charlen and, if possible, a
4909 length expression. */
4912 fixup_charlen (gfc_expr *e)
4914 /* The cases fall through so that changes in expression type and the need
4915 for multiple fixes are picked up. In all circumstances, a charlen should
4916 be available for the middle end to hang a backend_decl on. */
4917 switch (e->expr_type)
4920 gfc_resolve_character_operator (e);
4923 if (e->expr_type == EXPR_ARRAY)
4924 gfc_resolve_character_array_constructor (e);
4926 case EXPR_SUBSTRING:
4927 if (!e->ts.u.cl && e->ref)
4928 gfc_resolve_substring_charlen (e);
4932 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4939 /* Update an actual argument to include the passed-object for type-bound
4940 procedures at the right position. */
4942 static gfc_actual_arglist*
4943 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
4946 gcc_assert (argpos > 0);
4950 gfc_actual_arglist* result;
4952 result = gfc_get_actual_arglist ();
4956 result->name = name;
4962 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
4964 lst = update_arglist_pass (NULL, po, argpos - 1, name);
4969 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
4972 extract_compcall_passed_object (gfc_expr* e)
4976 gcc_assert (e->expr_type == EXPR_COMPCALL);
4978 if (e->value.compcall.base_object)
4979 po = gfc_copy_expr (e->value.compcall.base_object);
4982 po = gfc_get_expr ();
4983 po->expr_type = EXPR_VARIABLE;
4984 po->symtree = e->symtree;
4985 po->ref = gfc_copy_ref (e->ref);
4986 po->where = e->where;
4989 if (gfc_resolve_expr (po) == FAILURE)
4996 /* Update the arglist of an EXPR_COMPCALL expression to include the
5000 update_compcall_arglist (gfc_expr* e)
5003 gfc_typebound_proc* tbp;
5005 tbp = e->value.compcall.tbp;
5010 po = extract_compcall_passed_object (e);
5014 if (tbp->nopass || e->value.compcall.ignore_pass)
5020 gcc_assert (tbp->pass_arg_num > 0);
5021 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5029 /* Extract the passed object from a PPC call (a copy of it). */
5032 extract_ppc_passed_object (gfc_expr *e)
5037 po = gfc_get_expr ();
5038 po->expr_type = EXPR_VARIABLE;
5039 po->symtree = e->symtree;
5040 po->ref = gfc_copy_ref (e->ref);
5041 po->where = e->where;
5043 /* Remove PPC reference. */
5045 while ((*ref)->next)
5046 ref = &(*ref)->next;
5047 gfc_free_ref_list (*ref);
5050 if (gfc_resolve_expr (po) == FAILURE)
5057 /* Update the actual arglist of a procedure pointer component to include the
5061 update_ppc_arglist (gfc_expr* e)
5065 gfc_typebound_proc* tb;
5067 if (!gfc_is_proc_ptr_comp (e, &ppc))
5074 else if (tb->nopass)
5077 po = extract_ppc_passed_object (e);
5083 gfc_error ("Passed-object at %L must be scalar", &e->where);
5087 gcc_assert (tb->pass_arg_num > 0);
5088 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5096 /* Check that the object a TBP is called on is valid, i.e. it must not be
5097 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5100 check_typebound_baseobject (gfc_expr* e)
5104 base = extract_compcall_passed_object (e);
5108 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5110 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5112 gfc_error ("Base object for type-bound procedure call at %L is of"
5113 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5117 /* If the procedure called is NOPASS, the base object must be scalar. */
5118 if (e->value.compcall.tbp->nopass && base->rank > 0)
5120 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5121 " be scalar", &e->where);
5125 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
5128 gfc_error ("Non-scalar base object at %L currently not implemented",
5137 /* Resolve a call to a type-bound procedure, either function or subroutine,
5138 statically from the data in an EXPR_COMPCALL expression. The adapted
5139 arglist and the target-procedure symtree are returned. */
5142 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5143 gfc_actual_arglist** actual)
5145 gcc_assert (e->expr_type == EXPR_COMPCALL);
5146 gcc_assert (!e->value.compcall.tbp->is_generic);
5148 /* Update the actual arglist for PASS. */
5149 if (update_compcall_arglist (e) == FAILURE)
5152 *actual = e->value.compcall.actual;
5153 *target = e->value.compcall.tbp->u.specific;
5155 gfc_free_ref_list (e->ref);
5157 e->value.compcall.actual = NULL;
5163 /* Get the ultimate declared type from an expression. In addition,
5164 return the last class/derived type reference and the copy of the
5167 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5170 gfc_symbol *declared;
5177 *new_ref = gfc_copy_ref (e->ref);
5179 for (ref = e->ref; ref; ref = ref->next)
5181 if (ref->type != REF_COMPONENT)
5184 if (ref->u.c.component->ts.type == BT_CLASS
5185 || ref->u.c.component->ts.type == BT_DERIVED)
5187 declared = ref->u.c.component->ts.u.derived;
5193 if (declared == NULL)
5194 declared = e->symtree->n.sym->ts.u.derived;
5200 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5201 which of the specific bindings (if any) matches the arglist and transform
5202 the expression into a call of that binding. */
5205 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5207 gfc_typebound_proc* genproc;
5208 const char* genname;
5210 gfc_symbol *derived;
5212 gcc_assert (e->expr_type == EXPR_COMPCALL);
5213 genname = e->value.compcall.name;
5214 genproc = e->value.compcall.tbp;
5216 if (!genproc->is_generic)
5219 /* Try the bindings on this type and in the inheritance hierarchy. */
5220 for (; genproc; genproc = genproc->overridden)
5224 gcc_assert (genproc->is_generic);
5225 for (g = genproc->u.generic; g; g = g->next)
5228 gfc_actual_arglist* args;
5231 gcc_assert (g->specific);
5233 if (g->specific->error)
5236 target = g->specific->u.specific->n.sym;
5238 /* Get the right arglist by handling PASS/NOPASS. */
5239 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5240 if (!g->specific->nopass)
5243 po = extract_compcall_passed_object (e);
5247 gcc_assert (g->specific->pass_arg_num > 0);
5248 gcc_assert (!g->specific->error);
5249 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5250 g->specific->pass_arg);
5252 resolve_actual_arglist (args, target->attr.proc,
5253 is_external_proc (target) && !target->formal);
5255 /* Check if this arglist matches the formal. */
5256 matches = gfc_arglist_matches_symbol (&args, target);
5258 /* Clean up and break out of the loop if we've found it. */
5259 gfc_free_actual_arglist (args);
5262 e->value.compcall.tbp = g->specific;
5263 /* Pass along the name for CLASS methods, where the vtab
5264 procedure pointer component has to be referenced. */
5266 *name = g->specific_st->name;
5272 /* Nothing matching found! */
5273 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5274 " '%s' at %L", genname, &e->where);
5278 /* Make sure that we have the right specific instance for the name. */
5279 genname = e->value.compcall.tbp->u.specific->name;
5281 /* Is the symtree name a "unique name". */
5282 if (*genname == '@')
5283 genname = e->value.compcall.tbp->u.specific->n.sym->name;
5285 derived = get_declared_from_expr (NULL, NULL, e);
5287 st = gfc_find_typebound_proc (derived, NULL, genname, false, &e->where);
5289 e->value.compcall.tbp = st->n.tb;
5295 /* Resolve a call to a type-bound subroutine. */
5298 resolve_typebound_call (gfc_code* c, const char **name)
5300 gfc_actual_arglist* newactual;
5301 gfc_symtree* target;
5303 /* Check that's really a SUBROUTINE. */
5304 if (!c->expr1->value.compcall.tbp->subroutine)
5306 gfc_error ("'%s' at %L should be a SUBROUTINE",
5307 c->expr1->value.compcall.name, &c->loc);
5311 if (check_typebound_baseobject (c->expr1) == FAILURE)
5314 /* Pass along the name for CLASS methods, where the vtab
5315 procedure pointer component has to be referenced. */
5317 *name = c->expr1->value.compcall.name;
5319 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5322 /* Transform into an ordinary EXEC_CALL for now. */
5324 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5327 c->ext.actual = newactual;
5328 c->symtree = target;
5329 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5331 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5333 gfc_free_expr (c->expr1);
5334 c->expr1 = gfc_get_expr ();
5335 c->expr1->expr_type = EXPR_FUNCTION;
5336 c->expr1->symtree = target;
5337 c->expr1->where = c->loc;
5339 return resolve_call (c);
5343 /* Resolve a component-call expression. */
5345 resolve_compcall (gfc_expr* e, const char **name)
5347 gfc_actual_arglist* newactual;
5348 gfc_symtree* target;
5350 /* Check that's really a FUNCTION. */
5351 if (!e->value.compcall.tbp->function)
5353 gfc_error ("'%s' at %L should be a FUNCTION",
5354 e->value.compcall.name, &e->where);
5358 /* These must not be assign-calls! */
5359 gcc_assert (!e->value.compcall.assign);
5361 if (check_typebound_baseobject (e) == FAILURE)
5364 /* Pass along the name for CLASS methods, where the vtab
5365 procedure pointer component has to be referenced. */
5367 *name = e->value.compcall.name;
5369 if (resolve_typebound_generic_call (e, name) == FAILURE)
5371 gcc_assert (!e->value.compcall.tbp->is_generic);
5373 /* Take the rank from the function's symbol. */
5374 if (e->value.compcall.tbp->u.specific->n.sym->as)
5375 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5377 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5378 arglist to the TBP's binding target. */
5380 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5383 e->value.function.actual = newactual;
5384 e->value.function.name = NULL;
5385 e->value.function.esym = target->n.sym;
5386 e->value.function.isym = NULL;
5387 e->symtree = target;
5388 e->ts = target->n.sym->ts;
5389 e->expr_type = EXPR_FUNCTION;
5391 /* Resolution is not necessary if this is a class subroutine; this
5392 function only has to identify the specific proc. Resolution of
5393 the call will be done next in resolve_typebound_call. */
5394 return gfc_resolve_expr (e);
5399 /* Resolve a typebound function, or 'method'. First separate all
5400 the non-CLASS references by calling resolve_compcall directly. */
5403 resolve_typebound_function (gfc_expr* e)
5405 gfc_symbol *declared;
5411 const char *genname;
5416 return resolve_compcall (e, NULL);
5418 if (resolve_ref (e) == FAILURE)
5421 /* Get the CLASS declared type. */
5422 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5424 /* Weed out cases of the ultimate component being a derived type. */
5425 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5426 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5428 gfc_free_ref_list (new_ref);
5429 return resolve_compcall (e, NULL);
5432 c = gfc_find_component (declared, "$data", true, true);
5433 declared = c->ts.u.derived;
5435 /* Keep the generic name so that the vtab reference can be made. */
5437 if (e->value.compcall.tbp->is_generic)
5438 genname = e->value.compcall.name;
5440 /* Treat the call as if it is a typebound procedure, in order to roll
5441 out the correct name for the specific function. */
5442 resolve_compcall (e, &name);
5445 /* Then convert the expression to a procedure pointer component call. */
5446 e->value.function.esym = NULL;
5452 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5453 gfc_add_component_ref (e, "$vptr");
5456 /* A generic procedure needs the subsidiary vtabs and vtypes for
5457 the specific procedures to have been build. */
5459 vtab = gfc_find_derived_vtab (declared, true);
5461 gfc_add_component_ref (e, genname);
5463 gfc_add_component_ref (e, name);
5465 /* Recover the typespec for the expression. This is really only
5466 necessary for generic procedures, where the additional call
5467 to gfc_add_component_ref seems to throw the collection of the
5468 correct typespec. */
5473 /* Resolve a typebound subroutine, or 'method'. First separate all
5474 the non-CLASS references by calling resolve_typebound_call
5478 resolve_typebound_subroutine (gfc_code *code)
5480 gfc_symbol *declared;
5485 const char *genname;
5489 st = code->expr1->symtree;
5491 return resolve_typebound_call (code, NULL);
5493 if (resolve_ref (code->expr1) == FAILURE)
5496 /* Get the CLASS declared type. */
5497 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5499 /* Weed out cases of the ultimate component being a derived type. */
5500 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5501 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5503 gfc_free_ref_list (new_ref);
5504 return resolve_typebound_call (code, NULL);
5507 c = gfc_find_component (declared, "$data", true, true);
5508 declared = c->ts.u.derived;
5510 /* Keep the generic name so that the vtab reference can be made. */
5512 if (code->expr1->value.compcall.tbp->is_generic)
5513 genname = code->expr1->value.compcall.name;
5515 resolve_typebound_call (code, &name);
5516 ts = code->expr1->ts;
5518 /* Then convert the expression to a procedure pointer component call. */
5519 code->expr1->value.function.esym = NULL;
5520 code->expr1->symtree = st;
5523 code->expr1->ref = new_ref;
5525 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5526 gfc_add_component_ref (code->expr1, "$vptr");
5529 /* A generic procedure needs the subsidiary vtabs and vtypes for
5530 the specific procedures to have been build. */
5532 vtab = gfc_find_derived_vtab (declared, true);
5534 gfc_add_component_ref (code->expr1, genname);
5536 gfc_add_component_ref (code->expr1, name);
5538 /* Recover the typespec for the expression. This is really only
5539 necessary for generic procedures, where the additional call
5540 to gfc_add_component_ref seems to throw the collection of the
5541 correct typespec. */
5542 code->expr1->ts = ts;
5547 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5550 resolve_ppc_call (gfc_code* c)
5552 gfc_component *comp;
5555 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5558 c->resolved_sym = c->expr1->symtree->n.sym;
5559 c->expr1->expr_type = EXPR_VARIABLE;
5561 if (!comp->attr.subroutine)
5562 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5564 if (resolve_ref (c->expr1) == FAILURE)
5567 if (update_ppc_arglist (c->expr1) == FAILURE)
5570 c->ext.actual = c->expr1->value.compcall.actual;
5572 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5573 comp->formal == NULL) == FAILURE)
5576 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5582 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5585 resolve_expr_ppc (gfc_expr* e)
5587 gfc_component *comp;
5590 b = gfc_is_proc_ptr_comp (e, &comp);
5593 /* Convert to EXPR_FUNCTION. */
5594 e->expr_type = EXPR_FUNCTION;
5595 e->value.function.isym = NULL;
5596 e->value.function.actual = e->value.compcall.actual;
5598 if (comp->as != NULL)
5599 e->rank = comp->as->rank;
5601 if (!comp->attr.function)
5602 gfc_add_function (&comp->attr, comp->name, &e->where);
5604 if (resolve_ref (e) == FAILURE)
5607 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5608 comp->formal == NULL) == FAILURE)
5611 if (update_ppc_arglist (e) == FAILURE)
5614 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5621 gfc_is_expandable_expr (gfc_expr *e)
5623 gfc_constructor *con;
5625 if (e->expr_type == EXPR_ARRAY)
5627 /* Traverse the constructor looking for variables that are flavor
5628 parameter. Parameters must be expanded since they are fully used at
5630 con = gfc_constructor_first (e->value.constructor);
5631 for (; con; con = gfc_constructor_next (con))
5633 if (con->expr->expr_type == EXPR_VARIABLE
5634 && con->expr->symtree
5635 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5636 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5638 if (con->expr->expr_type == EXPR_ARRAY
5639 && gfc_is_expandable_expr (con->expr))
5647 /* Resolve an expression. That is, make sure that types of operands agree
5648 with their operators, intrinsic operators are converted to function calls
5649 for overloaded types and unresolved function references are resolved. */
5652 gfc_resolve_expr (gfc_expr *e)
5660 /* inquiry_argument only applies to variables. */
5661 inquiry_save = inquiry_argument;
5662 if (e->expr_type != EXPR_VARIABLE)
5663 inquiry_argument = false;
5665 switch (e->expr_type)
5668 t = resolve_operator (e);
5674 if (check_host_association (e))
5675 t = resolve_function (e);
5678 t = resolve_variable (e);
5680 expression_rank (e);
5683 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5684 && e->ref->type != REF_SUBSTRING)
5685 gfc_resolve_substring_charlen (e);
5690 t = resolve_typebound_function (e);
5693 case EXPR_SUBSTRING:
5694 t = resolve_ref (e);
5703 t = resolve_expr_ppc (e);
5708 if (resolve_ref (e) == FAILURE)
5711 t = gfc_resolve_array_constructor (e);
5712 /* Also try to expand a constructor. */
5715 expression_rank (e);
5716 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5717 gfc_expand_constructor (e);
5720 /* This provides the opportunity for the length of constructors with
5721 character valued function elements to propagate the string length
5722 to the expression. */
5723 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5725 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5726 here rather then add a duplicate test for it above. */
5727 gfc_expand_constructor (e);
5728 t = gfc_resolve_character_array_constructor (e);
5733 case EXPR_STRUCTURE:
5734 t = resolve_ref (e);
5738 t = resolve_structure_cons (e);
5742 t = gfc_simplify_expr (e, 0);
5746 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5749 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5752 inquiry_argument = inquiry_save;
5758 /* Resolve an expression from an iterator. They must be scalar and have
5759 INTEGER or (optionally) REAL type. */
5762 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5763 const char *name_msgid)
5765 if (gfc_resolve_expr (expr) == FAILURE)
5768 if (expr->rank != 0)
5770 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5774 if (expr->ts.type != BT_INTEGER)
5776 if (expr->ts.type == BT_REAL)
5779 return gfc_notify_std (GFC_STD_F95_DEL,
5780 "Deleted feature: %s at %L must be integer",
5781 _(name_msgid), &expr->where);
5784 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5791 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5799 /* Resolve the expressions in an iterator structure. If REAL_OK is
5800 false allow only INTEGER type iterators, otherwise allow REAL types. */
5803 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5805 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5809 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5811 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5816 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5817 "Start expression in DO loop") == FAILURE)
5820 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5821 "End expression in DO loop") == FAILURE)
5824 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5825 "Step expression in DO loop") == FAILURE)
5828 if (iter->step->expr_type == EXPR_CONSTANT)
5830 if ((iter->step->ts.type == BT_INTEGER
5831 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5832 || (iter->step->ts.type == BT_REAL
5833 && mpfr_sgn (iter->step->value.real) == 0))
5835 gfc_error ("Step expression in DO loop at %L cannot be zero",
5836 &iter->step->where);
5841 /* Convert start, end, and step to the same type as var. */
5842 if (iter->start->ts.kind != iter->var->ts.kind
5843 || iter->start->ts.type != iter->var->ts.type)
5844 gfc_convert_type (iter->start, &iter->var->ts, 2);
5846 if (iter->end->ts.kind != iter->var->ts.kind
5847 || iter->end->ts.type != iter->var->ts.type)
5848 gfc_convert_type (iter->end, &iter->var->ts, 2);
5850 if (iter->step->ts.kind != iter->var->ts.kind
5851 || iter->step->ts.type != iter->var->ts.type)
5852 gfc_convert_type (iter->step, &iter->var->ts, 2);
5854 if (iter->start->expr_type == EXPR_CONSTANT
5855 && iter->end->expr_type == EXPR_CONSTANT
5856 && iter->step->expr_type == EXPR_CONSTANT)
5859 if (iter->start->ts.type == BT_INTEGER)
5861 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5862 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5866 sgn = mpfr_sgn (iter->step->value.real);
5867 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5869 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5870 gfc_warning ("DO loop at %L will be executed zero times",
5871 &iter->step->where);
5878 /* Traversal function for find_forall_index. f == 2 signals that
5879 that variable itself is not to be checked - only the references. */
5882 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5884 if (expr->expr_type != EXPR_VARIABLE)
5887 /* A scalar assignment */
5888 if (!expr->ref || *f == 1)
5890 if (expr->symtree->n.sym == sym)
5902 /* Check whether the FORALL index appears in the expression or not.
5903 Returns SUCCESS if SYM is found in EXPR. */
5906 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5908 if (gfc_traverse_expr (expr, sym, forall_index, f))
5915 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5916 to be a scalar INTEGER variable. The subscripts and stride are scalar
5917 INTEGERs, and if stride is a constant it must be nonzero.
5918 Furthermore "A subscript or stride in a forall-triplet-spec shall
5919 not contain a reference to any index-name in the
5920 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5923 resolve_forall_iterators (gfc_forall_iterator *it)
5925 gfc_forall_iterator *iter, *iter2;
5927 for (iter = it; iter; iter = iter->next)
5929 if (gfc_resolve_expr (iter->var) == SUCCESS
5930 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5931 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5934 if (gfc_resolve_expr (iter->start) == SUCCESS
5935 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5936 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5937 &iter->start->where);
5938 if (iter->var->ts.kind != iter->start->ts.kind)
5939 gfc_convert_type (iter->start, &iter->var->ts, 2);
5941 if (gfc_resolve_expr (iter->end) == SUCCESS
5942 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
5943 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
5945 if (iter->var->ts.kind != iter->end->ts.kind)
5946 gfc_convert_type (iter->end, &iter->var->ts, 2);
5948 if (gfc_resolve_expr (iter->stride) == SUCCESS)
5950 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
5951 gfc_error ("FORALL stride expression at %L must be a scalar %s",
5952 &iter->stride->where, "INTEGER");
5954 if (iter->stride->expr_type == EXPR_CONSTANT
5955 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
5956 gfc_error ("FORALL stride expression at %L cannot be zero",
5957 &iter->stride->where);
5959 if (iter->var->ts.kind != iter->stride->ts.kind)
5960 gfc_convert_type (iter->stride, &iter->var->ts, 2);
5963 for (iter = it; iter; iter = iter->next)
5964 for (iter2 = iter; iter2; iter2 = iter2->next)
5966 if (find_forall_index (iter2->start,
5967 iter->var->symtree->n.sym, 0) == SUCCESS
5968 || find_forall_index (iter2->end,
5969 iter->var->symtree->n.sym, 0) == SUCCESS
5970 || find_forall_index (iter2->stride,
5971 iter->var->symtree->n.sym, 0) == SUCCESS)
5972 gfc_error ("FORALL index '%s' may not appear in triplet "
5973 "specification at %L", iter->var->symtree->name,
5974 &iter2->start->where);
5979 /* Given a pointer to a symbol that is a derived type, see if it's
5980 inaccessible, i.e. if it's defined in another module and the components are
5981 PRIVATE. The search is recursive if necessary. Returns zero if no
5982 inaccessible components are found, nonzero otherwise. */
5985 derived_inaccessible (gfc_symbol *sym)
5989 if (sym->attr.use_assoc && sym->attr.private_comp)
5992 for (c = sym->components; c; c = c->next)
5994 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6002 /* Resolve the argument of a deallocate expression. The expression must be
6003 a pointer or a full array. */
6006 resolve_deallocate_expr (gfc_expr *e)
6008 symbol_attribute attr;
6009 int allocatable, pointer, check_intent_in;
6014 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6015 check_intent_in = 1;
6017 if (gfc_resolve_expr (e) == FAILURE)
6020 if (e->expr_type != EXPR_VARIABLE)
6023 sym = e->symtree->n.sym;
6025 if (sym->ts.type == BT_CLASS)
6027 allocatable = CLASS_DATA (sym)->attr.allocatable;
6028 pointer = CLASS_DATA (sym)->attr.pointer;
6032 allocatable = sym->attr.allocatable;
6033 pointer = sym->attr.pointer;
6035 for (ref = e->ref; ref; ref = ref->next)
6038 check_intent_in = 0;
6043 if (ref->u.ar.type != AR_FULL)
6048 c = ref->u.c.component;
6049 if (c->ts.type == BT_CLASS)
6051 allocatable = CLASS_DATA (c)->attr.allocatable;
6052 pointer = CLASS_DATA (c)->attr.pointer;
6056 allocatable = c->attr.allocatable;
6057 pointer = c->attr.pointer;
6067 attr = gfc_expr_attr (e);
6069 if (allocatable == 0 && attr.pointer == 0)
6072 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6077 if (check_intent_in && sym->attr.intent == INTENT_IN)
6079 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
6080 sym->name, &e->where);
6084 if (e->ts.type == BT_CLASS)
6086 /* Only deallocate the DATA component. */
6087 gfc_add_component_ref (e, "$data");
6094 /* Returns true if the expression e contains a reference to the symbol sym. */
6096 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6098 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6105 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6107 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6111 /* Given the expression node e for an allocatable/pointer of derived type to be
6112 allocated, get the expression node to be initialized afterwards (needed for
6113 derived types with default initializers, and derived types with allocatable
6114 components that need nullification.) */
6117 gfc_expr_to_initialize (gfc_expr *e)
6123 result = gfc_copy_expr (e);
6125 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6126 for (ref = result->ref; ref; ref = ref->next)
6127 if (ref->type == REF_ARRAY && ref->next == NULL)
6129 ref->u.ar.type = AR_FULL;
6131 for (i = 0; i < ref->u.ar.dimen; i++)
6132 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6134 result->rank = ref->u.ar.dimen;
6142 /* Used in resolve_allocate_expr to check that a allocation-object and
6143 a source-expr are conformable. This does not catch all possible
6144 cases; in particular a runtime checking is needed. */
6147 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6149 /* First compare rank. */
6150 if (e2->ref && e1->rank != e2->ref->u.ar.as->rank)
6152 gfc_error ("Source-expr at %L must be scalar or have the "
6153 "same rank as the allocate-object at %L",
6154 &e1->where, &e2->where);
6165 for (i = 0; i < e1->rank; i++)
6167 if (e2->ref->u.ar.end[i])
6169 mpz_set (s, e2->ref->u.ar.end[i]->value.integer);
6170 mpz_sub (s, s, e2->ref->u.ar.start[i]->value.integer);
6171 mpz_add_ui (s, s, 1);
6175 mpz_set (s, e2->ref->u.ar.start[i]->value.integer);
6178 if (mpz_cmp (e1->shape[i], s) != 0)
6180 gfc_error ("Source-expr at %L and allocate-object at %L must "
6181 "have the same shape", &e1->where, &e2->where);
6194 /* Resolve the expression in an ALLOCATE statement, doing the additional
6195 checks to see whether the expression is OK or not. The expression must
6196 have a trailing array reference that gives the size of the array. */
6199 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6201 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6203 symbol_attribute attr;
6204 gfc_ref *ref, *ref2;
6206 gfc_symbol *sym = NULL;
6211 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6212 check_intent_in = 1;
6214 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6215 checking of coarrays. */
6216 for (ref = e->ref; ref; ref = ref->next)
6217 if (ref->next == NULL)
6220 if (ref && ref->type == REF_ARRAY)
6221 ref->u.ar.in_allocate = true;
6223 if (gfc_resolve_expr (e) == FAILURE)
6226 /* Make sure the expression is allocatable or a pointer. If it is
6227 pointer, the next-to-last reference must be a pointer. */
6231 sym = e->symtree->n.sym;
6233 /* Check whether ultimate component is abstract and CLASS. */
6236 if (e->expr_type != EXPR_VARIABLE)
6239 attr = gfc_expr_attr (e);
6240 pointer = attr.pointer;
6241 dimension = attr.dimension;
6242 codimension = attr.codimension;
6246 if (sym->ts.type == BT_CLASS)
6248 allocatable = CLASS_DATA (sym)->attr.allocatable;
6249 pointer = CLASS_DATA (sym)->attr.pointer;
6250 dimension = CLASS_DATA (sym)->attr.dimension;
6251 codimension = CLASS_DATA (sym)->attr.codimension;
6252 is_abstract = CLASS_DATA (sym)->attr.abstract;
6256 allocatable = sym->attr.allocatable;
6257 pointer = sym->attr.pointer;
6258 dimension = sym->attr.dimension;
6259 codimension = sym->attr.codimension;
6262 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6265 check_intent_in = 0;
6270 if (ref->next != NULL)
6276 if (gfc_is_coindexed (e))
6278 gfc_error ("Coindexed allocatable object at %L",
6283 c = ref->u.c.component;
6284 if (c->ts.type == BT_CLASS)
6286 allocatable = CLASS_DATA (c)->attr.allocatable;
6287 pointer = CLASS_DATA (c)->attr.pointer;
6288 dimension = CLASS_DATA (c)->attr.dimension;
6289 codimension = CLASS_DATA (c)->attr.codimension;
6290 is_abstract = CLASS_DATA (c)->attr.abstract;
6294 allocatable = c->attr.allocatable;
6295 pointer = c->attr.pointer;
6296 dimension = c->attr.dimension;
6297 codimension = c->attr.codimension;
6298 is_abstract = c->attr.abstract;
6310 if (allocatable == 0 && pointer == 0)
6312 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6317 /* Some checks for the SOURCE tag. */
6320 /* Check F03:C631. */
6321 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6323 gfc_error ("Type of entity at %L is type incompatible with "
6324 "source-expr at %L", &e->where, &code->expr3->where);
6328 /* Check F03:C632 and restriction following Note 6.18. */
6329 if (code->expr3->rank > 0
6330 && conformable_arrays (code->expr3, e) == FAILURE)
6333 /* Check F03:C633. */
6334 if (code->expr3->ts.kind != e->ts.kind)
6336 gfc_error ("The allocate-object at %L and the source-expr at %L "
6337 "shall have the same kind type parameter",
6338 &e->where, &code->expr3->where);
6342 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6344 gcc_assert (e->ts.type == BT_CLASS);
6345 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6346 "type-spec or SOURCE=", sym->name, &e->where);
6350 if (check_intent_in && sym->attr.intent == INTENT_IN)
6352 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6353 sym->name, &e->where);
6359 /* Add default initializer for those derived types that need them. */
6360 if (e->ts.type == BT_DERIVED
6361 && (init_e = gfc_default_initializer (&e->ts)))
6363 gfc_code *init_st = gfc_get_code ();
6364 init_st->loc = code->loc;
6365 init_st->op = EXEC_INIT_ASSIGN;
6366 init_st->expr1 = gfc_expr_to_initialize (e);
6367 init_st->expr2 = init_e;
6368 init_st->next = code->next;
6369 code->next = init_st;
6371 else if (e->ts.type == BT_CLASS
6372 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6373 && (init_e = gfc_default_initializer (&CLASS_DATA (e)->ts)))
6374 || (code->ext.alloc.ts.type == BT_DERIVED
6375 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6377 gfc_code *init_st = gfc_get_code ();
6378 init_st->loc = code->loc;
6379 init_st->op = EXEC_INIT_ASSIGN;
6380 init_st->expr1 = gfc_expr_to_initialize (e);
6381 init_st->expr2 = init_e;
6382 init_st->next = code->next;
6383 code->next = init_st;
6387 if (pointer || (dimension == 0 && codimension == 0))
6390 /* Make sure the next-to-last reference node is an array specification. */
6392 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6393 || (dimension && ref2->u.ar.dimen == 0))
6395 gfc_error ("Array specification required in ALLOCATE statement "
6396 "at %L", &e->where);
6400 /* Make sure that the array section reference makes sense in the
6401 context of an ALLOCATE specification. */
6405 if (codimension && ar->codimen == 0)
6407 gfc_error ("Coarray specification required in ALLOCATE statement "
6408 "at %L", &e->where);
6412 for (i = 0; i < ar->dimen; i++)
6414 if (ref2->u.ar.type == AR_ELEMENT)
6417 switch (ar->dimen_type[i])
6423 if (ar->start[i] != NULL
6424 && ar->end[i] != NULL
6425 && ar->stride[i] == NULL)
6428 /* Fall Through... */
6433 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6439 for (a = code->ext.alloc.list; a; a = a->next)
6441 sym = a->expr->symtree->n.sym;
6443 /* TODO - check derived type components. */
6444 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6447 if ((ar->start[i] != NULL
6448 && gfc_find_sym_in_expr (sym, ar->start[i]))
6449 || (ar->end[i] != NULL
6450 && gfc_find_sym_in_expr (sym, ar->end[i])))
6452 gfc_error ("'%s' must not appear in the array specification at "
6453 "%L in the same ALLOCATE statement where it is "
6454 "itself allocated", sym->name, &ar->where);
6460 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6462 if (ar->dimen_type[i] == DIMEN_ELEMENT
6463 || ar->dimen_type[i] == DIMEN_RANGE)
6465 if (i == (ar->dimen + ar->codimen - 1))
6467 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6468 "statement at %L", &e->where);
6474 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6475 && ar->stride[i] == NULL)
6478 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6483 if (codimension && ar->as->rank == 0)
6485 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6486 "at %L", &e->where);
6498 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6500 gfc_expr *stat, *errmsg, *pe, *qe;
6501 gfc_alloc *a, *p, *q;
6503 stat = code->expr1 ? code->expr1 : NULL;
6505 errmsg = code->expr2 ? code->expr2 : NULL;
6507 /* Check the stat variable. */
6510 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6511 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6512 stat->symtree->n.sym->name, &stat->where);
6514 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6515 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6518 if ((stat->ts.type != BT_INTEGER
6519 && !(stat->ref && (stat->ref->type == REF_ARRAY
6520 || stat->ref->type == REF_COMPONENT)))
6522 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6523 "variable", &stat->where);
6525 for (p = code->ext.alloc.list; p; p = p->next)
6526 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6527 gfc_error ("Stat-variable at %L shall not be %sd within "
6528 "the same %s statement", &stat->where, fcn, fcn);
6531 /* Check the errmsg variable. */
6535 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6538 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6539 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6540 errmsg->symtree->n.sym->name, &errmsg->where);
6542 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6543 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6546 if ((errmsg->ts.type != BT_CHARACTER
6548 && (errmsg->ref->type == REF_ARRAY
6549 || errmsg->ref->type == REF_COMPONENT)))
6550 || errmsg->rank > 0 )
6551 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6552 "variable", &errmsg->where);
6554 for (p = code->ext.alloc.list; p; p = p->next)
6555 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6556 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6557 "the same %s statement", &errmsg->where, fcn, fcn);
6560 /* Check that an allocate-object appears only once in the statement.
6561 FIXME: Checking derived types is disabled. */
6562 for (p = code->ext.alloc.list; p; p = p->next)
6565 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6566 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6568 for (q = p->next; q; q = q->next)
6571 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6572 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6573 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6574 gfc_error ("Allocate-object at %L also appears at %L",
6575 &pe->where, &qe->where);
6580 if (strcmp (fcn, "ALLOCATE") == 0)
6582 for (a = code->ext.alloc.list; a; a = a->next)
6583 resolve_allocate_expr (a->expr, code);
6587 for (a = code->ext.alloc.list; a; a = a->next)
6588 resolve_deallocate_expr (a->expr);
6593 /************ SELECT CASE resolution subroutines ************/
6595 /* Callback function for our mergesort variant. Determines interval
6596 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6597 op1 > op2. Assumes we're not dealing with the default case.
6598 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6599 There are nine situations to check. */
6602 compare_cases (const gfc_case *op1, const gfc_case *op2)
6606 if (op1->low == NULL) /* op1 = (:L) */
6608 /* op2 = (:N), so overlap. */
6610 /* op2 = (M:) or (M:N), L < M */
6611 if (op2->low != NULL
6612 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6615 else if (op1->high == NULL) /* op1 = (K:) */
6617 /* op2 = (M:), so overlap. */
6619 /* op2 = (:N) or (M:N), K > N */
6620 if (op2->high != NULL
6621 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6624 else /* op1 = (K:L) */
6626 if (op2->low == NULL) /* op2 = (:N), K > N */
6627 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6629 else if (op2->high == NULL) /* op2 = (M:), L < M */
6630 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6632 else /* op2 = (M:N) */
6636 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6639 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6648 /* Merge-sort a double linked case list, detecting overlap in the
6649 process. LIST is the head of the double linked case list before it
6650 is sorted. Returns the head of the sorted list if we don't see any
6651 overlap, or NULL otherwise. */
6654 check_case_overlap (gfc_case *list)
6656 gfc_case *p, *q, *e, *tail;
6657 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6659 /* If the passed list was empty, return immediately. */
6666 /* Loop unconditionally. The only exit from this loop is a return
6667 statement, when we've finished sorting the case list. */
6674 /* Count the number of merges we do in this pass. */
6677 /* Loop while there exists a merge to be done. */
6682 /* Count this merge. */
6685 /* Cut the list in two pieces by stepping INSIZE places
6686 forward in the list, starting from P. */
6689 for (i = 0; i < insize; i++)
6698 /* Now we have two lists. Merge them! */
6699 while (psize > 0 || (qsize > 0 && q != NULL))
6701 /* See from which the next case to merge comes from. */
6704 /* P is empty so the next case must come from Q. */
6709 else if (qsize == 0 || q == NULL)
6718 cmp = compare_cases (p, q);
6721 /* The whole case range for P is less than the
6729 /* The whole case range for Q is greater than
6730 the case range for P. */
6737 /* The cases overlap, or they are the same
6738 element in the list. Either way, we must
6739 issue an error and get the next case from P. */
6740 /* FIXME: Sort P and Q by line number. */
6741 gfc_error ("CASE label at %L overlaps with CASE "
6742 "label at %L", &p->where, &q->where);
6750 /* Add the next element to the merged list. */
6759 /* P has now stepped INSIZE places along, and so has Q. So
6760 they're the same. */
6765 /* If we have done only one merge or none at all, we've
6766 finished sorting the cases. */
6775 /* Otherwise repeat, merging lists twice the size. */
6781 /* Check to see if an expression is suitable for use in a CASE statement.
6782 Makes sure that all case expressions are scalar constants of the same
6783 type. Return FAILURE if anything is wrong. */
6786 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6788 if (e == NULL) return SUCCESS;
6790 if (e->ts.type != case_expr->ts.type)
6792 gfc_error ("Expression in CASE statement at %L must be of type %s",
6793 &e->where, gfc_basic_typename (case_expr->ts.type));
6797 /* C805 (R808) For a given case-construct, each case-value shall be of
6798 the same type as case-expr. For character type, length differences
6799 are allowed, but the kind type parameters shall be the same. */
6801 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6803 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6804 &e->where, case_expr->ts.kind);
6808 /* Convert the case value kind to that of case expression kind,
6811 if (e->ts.kind != case_expr->ts.kind)
6812 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6816 gfc_error ("Expression in CASE statement at %L must be scalar",
6825 /* Given a completely parsed select statement, we:
6827 - Validate all expressions and code within the SELECT.
6828 - Make sure that the selection expression is not of the wrong type.
6829 - Make sure that no case ranges overlap.
6830 - Eliminate unreachable cases and unreachable code resulting from
6831 removing case labels.
6833 The standard does allow unreachable cases, e.g. CASE (5:3). But
6834 they are a hassle for code generation, and to prevent that, we just
6835 cut them out here. This is not necessary for overlapping cases
6836 because they are illegal and we never even try to generate code.
6838 We have the additional caveat that a SELECT construct could have
6839 been a computed GOTO in the source code. Fortunately we can fairly
6840 easily work around that here: The case_expr for a "real" SELECT CASE
6841 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6842 we have to do is make sure that the case_expr is a scalar integer
6846 resolve_select (gfc_code *code)
6849 gfc_expr *case_expr;
6850 gfc_case *cp, *default_case, *tail, *head;
6851 int seen_unreachable;
6857 if (code->expr1 == NULL)
6859 /* This was actually a computed GOTO statement. */
6860 case_expr = code->expr2;
6861 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6862 gfc_error ("Selection expression in computed GOTO statement "
6863 "at %L must be a scalar integer expression",
6866 /* Further checking is not necessary because this SELECT was built
6867 by the compiler, so it should always be OK. Just move the
6868 case_expr from expr2 to expr so that we can handle computed
6869 GOTOs as normal SELECTs from here on. */
6870 code->expr1 = code->expr2;
6875 case_expr = code->expr1;
6877 type = case_expr->ts.type;
6878 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6880 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6881 &case_expr->where, gfc_typename (&case_expr->ts));
6883 /* Punt. Going on here just produce more garbage error messages. */
6887 if (case_expr->rank != 0)
6889 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6890 "expression", &case_expr->where);
6897 /* Raise a warning if an INTEGER case value exceeds the range of
6898 the case-expr. Later, all expressions will be promoted to the
6899 largest kind of all case-labels. */
6901 if (type == BT_INTEGER)
6902 for (body = code->block; body; body = body->block)
6903 for (cp = body->ext.case_list; cp; cp = cp->next)
6906 && gfc_check_integer_range (cp->low->value.integer,
6907 case_expr->ts.kind) != ARITH_OK)
6908 gfc_warning ("Expression in CASE statement at %L is "
6909 "not in the range of %s", &cp->low->where,
6910 gfc_typename (&case_expr->ts));
6913 && cp->low != cp->high
6914 && gfc_check_integer_range (cp->high->value.integer,
6915 case_expr->ts.kind) != ARITH_OK)
6916 gfc_warning ("Expression in CASE statement at %L is "
6917 "not in the range of %s", &cp->high->where,
6918 gfc_typename (&case_expr->ts));
6921 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6922 of the SELECT CASE expression and its CASE values. Walk the lists
6923 of case values, and if we find a mismatch, promote case_expr to
6924 the appropriate kind. */
6926 if (type == BT_LOGICAL || type == BT_INTEGER)
6928 for (body = code->block; body; body = body->block)
6930 /* Walk the case label list. */
6931 for (cp = body->ext.case_list; cp; cp = cp->next)
6933 /* Intercept the DEFAULT case. It does not have a kind. */
6934 if (cp->low == NULL && cp->high == NULL)
6937 /* Unreachable case ranges are discarded, so ignore. */
6938 if (cp->low != NULL && cp->high != NULL
6939 && cp->low != cp->high
6940 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6944 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6945 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6947 if (cp->high != NULL
6948 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6949 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6954 /* Assume there is no DEFAULT case. */
6955 default_case = NULL;
6960 for (body = code->block; body; body = body->block)
6962 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6964 seen_unreachable = 0;
6966 /* Walk the case label list, making sure that all case labels
6968 for (cp = body->ext.case_list; cp; cp = cp->next)
6970 /* Count the number of cases in the whole construct. */
6973 /* Intercept the DEFAULT case. */
6974 if (cp->low == NULL && cp->high == NULL)
6976 if (default_case != NULL)
6978 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6979 "by a second DEFAULT CASE at %L",
6980 &default_case->where, &cp->where);
6991 /* Deal with single value cases and case ranges. Errors are
6992 issued from the validation function. */
6993 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
6994 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7000 if (type == BT_LOGICAL
7001 && ((cp->low == NULL || cp->high == NULL)
7002 || cp->low != cp->high))
7004 gfc_error ("Logical range in CASE statement at %L is not "
7005 "allowed", &cp->low->where);
7010 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7013 value = cp->low->value.logical == 0 ? 2 : 1;
7014 if (value & seen_logical)
7016 gfc_error ("Constant logical value in CASE statement "
7017 "is repeated at %L",
7022 seen_logical |= value;
7025 if (cp->low != NULL && cp->high != NULL
7026 && cp->low != cp->high
7027 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7029 if (gfc_option.warn_surprising)
7030 gfc_warning ("Range specification at %L can never "
7031 "be matched", &cp->where);
7033 cp->unreachable = 1;
7034 seen_unreachable = 1;
7038 /* If the case range can be matched, it can also overlap with
7039 other cases. To make sure it does not, we put it in a
7040 double linked list here. We sort that with a merge sort
7041 later on to detect any overlapping cases. */
7045 head->right = head->left = NULL;
7050 tail->right->left = tail;
7057 /* It there was a failure in the previous case label, give up
7058 for this case label list. Continue with the next block. */
7062 /* See if any case labels that are unreachable have been seen.
7063 If so, we eliminate them. This is a bit of a kludge because
7064 the case lists for a single case statement (label) is a
7065 single forward linked lists. */
7066 if (seen_unreachable)
7068 /* Advance until the first case in the list is reachable. */
7069 while (body->ext.case_list != NULL
7070 && body->ext.case_list->unreachable)
7072 gfc_case *n = body->ext.case_list;
7073 body->ext.case_list = body->ext.case_list->next;
7075 gfc_free_case_list (n);
7078 /* Strip all other unreachable cases. */
7079 if (body->ext.case_list)
7081 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7083 if (cp->next->unreachable)
7085 gfc_case *n = cp->next;
7086 cp->next = cp->next->next;
7088 gfc_free_case_list (n);
7095 /* See if there were overlapping cases. If the check returns NULL,
7096 there was overlap. In that case we don't do anything. If head
7097 is non-NULL, we prepend the DEFAULT case. The sorted list can
7098 then used during code generation for SELECT CASE constructs with
7099 a case expression of a CHARACTER type. */
7102 head = check_case_overlap (head);
7104 /* Prepend the default_case if it is there. */
7105 if (head != NULL && default_case)
7107 default_case->left = NULL;
7108 default_case->right = head;
7109 head->left = default_case;
7113 /* Eliminate dead blocks that may be the result if we've seen
7114 unreachable case labels for a block. */
7115 for (body = code; body && body->block; body = body->block)
7117 if (body->block->ext.case_list == NULL)
7119 /* Cut the unreachable block from the code chain. */
7120 gfc_code *c = body->block;
7121 body->block = c->block;
7123 /* Kill the dead block, but not the blocks below it. */
7125 gfc_free_statements (c);
7129 /* More than two cases is legal but insane for logical selects.
7130 Issue a warning for it. */
7131 if (gfc_option.warn_surprising && type == BT_LOGICAL
7133 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7138 /* Check if a derived type is extensible. */
7141 gfc_type_is_extensible (gfc_symbol *sym)
7143 return !(sym->attr.is_bind_c || sym->attr.sequence);
7147 /* Resolve a SELECT TYPE statement. */
7150 resolve_select_type (gfc_code *code)
7152 gfc_symbol *selector_type;
7153 gfc_code *body, *new_st, *if_st, *tail;
7154 gfc_code *class_is = NULL, *default_case = NULL;
7157 char name[GFC_MAX_SYMBOL_LEN];
7164 /* Check for F03:C813. */
7165 if (code->expr1->ts.type != BT_CLASS
7166 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7168 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7169 "at %L", &code->loc);
7175 if (code->expr1->symtree->n.sym->attr.untyped)
7176 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7177 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7180 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7182 /* Loop over TYPE IS / CLASS IS cases. */
7183 for (body = code->block; body; body = body->block)
7185 c = body->ext.case_list;
7187 /* Check F03:C815. */
7188 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7189 && !gfc_type_is_extensible (c->ts.u.derived))
7191 gfc_error ("Derived type '%s' at %L must be extensible",
7192 c->ts.u.derived->name, &c->where);
7197 /* Check F03:C816. */
7198 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7199 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7201 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7202 c->ts.u.derived->name, &c->where, selector_type->name);
7207 /* Intercept the DEFAULT case. */
7208 if (c->ts.type == BT_UNKNOWN)
7210 /* Check F03:C818. */
7213 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7214 "by a second DEFAULT CASE at %L",
7215 &default_case->ext.case_list->where, &c->where);
7220 default_case = body;
7229 /* Insert assignment for selector variable. */
7230 new_st = gfc_get_code ();
7231 new_st->op = EXEC_ASSIGN;
7232 new_st->expr1 = gfc_copy_expr (code->expr1);
7233 new_st->expr2 = gfc_copy_expr (code->expr2);
7237 /* Put SELECT TYPE statement inside a BLOCK. */
7238 new_st = gfc_get_code ();
7239 new_st->op = code->op;
7240 new_st->expr1 = code->expr1;
7241 new_st->expr2 = code->expr2;
7242 new_st->block = code->block;
7246 ns->code->next = new_st;
7247 code->op = EXEC_BLOCK;
7248 code->expr1 = code->expr2 = NULL;
7253 /* Transform to EXEC_SELECT. */
7254 code->op = EXEC_SELECT;
7255 gfc_add_component_ref (code->expr1, "$vptr");
7256 gfc_add_component_ref (code->expr1, "$hash");
7258 /* Loop over TYPE IS / CLASS IS cases. */
7259 for (body = code->block; body; body = body->block)
7261 c = body->ext.case_list;
7263 if (c->ts.type == BT_DERIVED)
7264 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7265 c->ts.u.derived->hash_value);
7267 else if (c->ts.type == BT_UNKNOWN)
7270 /* Assign temporary to selector. */
7271 if (c->ts.type == BT_CLASS)
7272 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7274 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7275 st = gfc_find_symtree (ns->sym_root, name);
7276 new_st = gfc_get_code ();
7277 new_st->expr1 = gfc_get_variable_expr (st);
7278 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7279 if (c->ts.type == BT_DERIVED)
7281 new_st->op = EXEC_POINTER_ASSIGN;
7282 gfc_add_component_ref (new_st->expr2, "$data");
7285 new_st->op = EXEC_POINTER_ASSIGN;
7286 new_st->next = body->next;
7287 body->next = new_st;
7290 /* Take out CLASS IS cases for separate treatment. */
7292 while (body && body->block)
7294 if (body->block->ext.case_list->ts.type == BT_CLASS)
7296 /* Add to class_is list. */
7297 if (class_is == NULL)
7299 class_is = body->block;
7304 for (tail = class_is; tail->block; tail = tail->block) ;
7305 tail->block = body->block;
7308 /* Remove from EXEC_SELECT list. */
7309 body->block = body->block->block;
7322 /* Add a default case to hold the CLASS IS cases. */
7323 for (tail = code; tail->block; tail = tail->block) ;
7324 tail->block = gfc_get_code ();
7326 tail->op = EXEC_SELECT_TYPE;
7327 tail->ext.case_list = gfc_get_case ();
7328 tail->ext.case_list->ts.type = BT_UNKNOWN;
7330 default_case = tail;
7333 /* More than one CLASS IS block? */
7334 if (class_is->block)
7338 /* Sort CLASS IS blocks by extension level. */
7342 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7345 /* F03:C817 (check for doubles). */
7346 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7347 == c2->ext.case_list->ts.u.derived->hash_value)
7349 gfc_error ("Double CLASS IS block in SELECT TYPE "
7350 "statement at %L", &c2->ext.case_list->where);
7353 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7354 < c2->ext.case_list->ts.u.derived->attr.extension)
7357 (*c1)->block = c2->block;
7367 /* Generate IF chain. */
7368 if_st = gfc_get_code ();
7369 if_st->op = EXEC_IF;
7371 for (body = class_is; body; body = body->block)
7373 new_st->block = gfc_get_code ();
7374 new_st = new_st->block;
7375 new_st->op = EXEC_IF;
7376 /* Set up IF condition: Call _gfortran_is_extension_of. */
7377 new_st->expr1 = gfc_get_expr ();
7378 new_st->expr1->expr_type = EXPR_FUNCTION;
7379 new_st->expr1->ts.type = BT_LOGICAL;
7380 new_st->expr1->ts.kind = 4;
7381 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7382 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7383 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7384 /* Set up arguments. */
7385 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7386 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7387 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7388 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived, true);
7389 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7390 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7391 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7392 new_st->next = body->next;
7394 if (default_case->next)
7396 new_st->block = gfc_get_code ();
7397 new_st = new_st->block;
7398 new_st->op = EXEC_IF;
7399 new_st->next = default_case->next;
7402 /* Replace CLASS DEFAULT code by the IF chain. */
7403 default_case->next = if_st;
7406 resolve_select (code);
7411 /* Resolve a transfer statement. This is making sure that:
7412 -- a derived type being transferred has only non-pointer components
7413 -- a derived type being transferred doesn't have private components, unless
7414 it's being transferred from the module where the type was defined
7415 -- we're not trying to transfer a whole assumed size array. */
7418 resolve_transfer (gfc_code *code)
7427 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7430 sym = exp->symtree->n.sym;
7433 /* Go to actual component transferred. */
7434 for (ref = code->expr1->ref; ref; ref = ref->next)
7435 if (ref->type == REF_COMPONENT)
7436 ts = &ref->u.c.component->ts;
7438 if (ts->type == BT_DERIVED)
7440 /* Check that transferred derived type doesn't contain POINTER
7442 if (ts->u.derived->attr.pointer_comp)
7444 gfc_error ("Data transfer element at %L cannot have "
7445 "POINTER components", &code->loc);
7449 if (ts->u.derived->attr.alloc_comp)
7451 gfc_error ("Data transfer element at %L cannot have "
7452 "ALLOCATABLE components", &code->loc);
7456 if (derived_inaccessible (ts->u.derived))
7458 gfc_error ("Data transfer element at %L cannot have "
7459 "PRIVATE components",&code->loc);
7464 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7465 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7467 gfc_error ("Data transfer element at %L cannot be a full reference to "
7468 "an assumed-size array", &code->loc);
7474 /*********** Toplevel code resolution subroutines ***********/
7476 /* Find the set of labels that are reachable from this block. We also
7477 record the last statement in each block. */
7480 find_reachable_labels (gfc_code *block)
7487 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7489 /* Collect labels in this block. We don't keep those corresponding
7490 to END {IF|SELECT}, these are checked in resolve_branch by going
7491 up through the code_stack. */
7492 for (c = block; c; c = c->next)
7494 if (c->here && c->op != EXEC_END_BLOCK)
7495 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7498 /* Merge with labels from parent block. */
7501 gcc_assert (cs_base->prev->reachable_labels);
7502 bitmap_ior_into (cs_base->reachable_labels,
7503 cs_base->prev->reachable_labels);
7509 resolve_sync (gfc_code *code)
7511 /* Check imageset. The * case matches expr1 == NULL. */
7514 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7515 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7516 "INTEGER expression", &code->expr1->where);
7517 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7518 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7519 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7520 &code->expr1->where);
7521 else if (code->expr1->expr_type == EXPR_ARRAY
7522 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7524 gfc_constructor *cons;
7525 cons = gfc_constructor_first (code->expr1->value.constructor);
7526 for (; cons; cons = gfc_constructor_next (cons))
7527 if (cons->expr->expr_type == EXPR_CONSTANT
7528 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7529 gfc_error ("Imageset argument at %L must between 1 and "
7530 "num_images()", &cons->expr->where);
7536 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7537 || code->expr2->expr_type != EXPR_VARIABLE))
7538 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7539 &code->expr2->where);
7543 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7544 || code->expr3->expr_type != EXPR_VARIABLE))
7545 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7546 &code->expr3->where);
7550 /* Given a branch to a label, see if the branch is conforming.
7551 The code node describes where the branch is located. */
7554 resolve_branch (gfc_st_label *label, gfc_code *code)
7561 /* Step one: is this a valid branching target? */
7563 if (label->defined == ST_LABEL_UNKNOWN)
7565 gfc_error ("Label %d referenced at %L is never defined", label->value,
7570 if (label->defined != ST_LABEL_TARGET)
7572 gfc_error ("Statement at %L is not a valid branch target statement "
7573 "for the branch statement at %L", &label->where, &code->loc);
7577 /* Step two: make sure this branch is not a branch to itself ;-) */
7579 if (code->here == label)
7581 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7585 /* Step three: See if the label is in the same block as the
7586 branching statement. The hard work has been done by setting up
7587 the bitmap reachable_labels. */
7589 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7591 /* Check now whether there is a CRITICAL construct; if so, check
7592 whether the label is still visible outside of the CRITICAL block,
7593 which is invalid. */
7594 for (stack = cs_base; stack; stack = stack->prev)
7595 if (stack->current->op == EXEC_CRITICAL
7596 && bitmap_bit_p (stack->reachable_labels, label->value))
7597 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7598 " at %L", &code->loc, &label->where);
7603 /* Step four: If we haven't found the label in the bitmap, it may
7604 still be the label of the END of the enclosing block, in which
7605 case we find it by going up the code_stack. */
7607 for (stack = cs_base; stack; stack = stack->prev)
7609 if (stack->current->next && stack->current->next->here == label)
7611 if (stack->current->op == EXEC_CRITICAL)
7613 /* Note: A label at END CRITICAL does not leave the CRITICAL
7614 construct as END CRITICAL is still part of it. */
7615 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7616 " at %L", &code->loc, &label->where);
7623 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7627 /* The label is not in an enclosing block, so illegal. This was
7628 allowed in Fortran 66, so we allow it as extension. No
7629 further checks are necessary in this case. */
7630 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7631 "as the GOTO statement at %L", &label->where,
7637 /* Check whether EXPR1 has the same shape as EXPR2. */
7640 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7642 mpz_t shape[GFC_MAX_DIMENSIONS];
7643 mpz_t shape2[GFC_MAX_DIMENSIONS];
7644 gfc_try result = FAILURE;
7647 /* Compare the rank. */
7648 if (expr1->rank != expr2->rank)
7651 /* Compare the size of each dimension. */
7652 for (i=0; i<expr1->rank; i++)
7654 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7657 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7660 if (mpz_cmp (shape[i], shape2[i]))
7664 /* When either of the two expression is an assumed size array, we
7665 ignore the comparison of dimension sizes. */
7670 for (i--; i >= 0; i--)
7672 mpz_clear (shape[i]);
7673 mpz_clear (shape2[i]);
7679 /* Check whether a WHERE assignment target or a WHERE mask expression
7680 has the same shape as the outmost WHERE mask expression. */
7683 resolve_where (gfc_code *code, gfc_expr *mask)
7689 cblock = code->block;
7691 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7692 In case of nested WHERE, only the outmost one is stored. */
7693 if (mask == NULL) /* outmost WHERE */
7695 else /* inner WHERE */
7702 /* Check if the mask-expr has a consistent shape with the
7703 outmost WHERE mask-expr. */
7704 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7705 gfc_error ("WHERE mask at %L has inconsistent shape",
7706 &cblock->expr1->where);
7709 /* the assignment statement of a WHERE statement, or the first
7710 statement in where-body-construct of a WHERE construct */
7711 cnext = cblock->next;
7716 /* WHERE assignment statement */
7719 /* Check shape consistent for WHERE assignment target. */
7720 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7721 gfc_error ("WHERE assignment target at %L has "
7722 "inconsistent shape", &cnext->expr1->where);
7726 case EXEC_ASSIGN_CALL:
7727 resolve_call (cnext);
7728 if (!cnext->resolved_sym->attr.elemental)
7729 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7730 &cnext->ext.actual->expr->where);
7733 /* WHERE or WHERE construct is part of a where-body-construct */
7735 resolve_where (cnext, e);
7739 gfc_error ("Unsupported statement inside WHERE at %L",
7742 /* the next statement within the same where-body-construct */
7743 cnext = cnext->next;
7745 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7746 cblock = cblock->block;
7751 /* Resolve assignment in FORALL construct.
7752 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7753 FORALL index variables. */
7756 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7760 for (n = 0; n < nvar; n++)
7762 gfc_symbol *forall_index;
7764 forall_index = var_expr[n]->symtree->n.sym;
7766 /* Check whether the assignment target is one of the FORALL index
7768 if ((code->expr1->expr_type == EXPR_VARIABLE)
7769 && (code->expr1->symtree->n.sym == forall_index))
7770 gfc_error ("Assignment to a FORALL index variable at %L",
7771 &code->expr1->where);
7774 /* If one of the FORALL index variables doesn't appear in the
7775 assignment variable, then there could be a many-to-one
7776 assignment. Emit a warning rather than an error because the
7777 mask could be resolving this problem. */
7778 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7779 gfc_warning ("The FORALL with index '%s' is not used on the "
7780 "left side of the assignment at %L and so might "
7781 "cause multiple assignment to this object",
7782 var_expr[n]->symtree->name, &code->expr1->where);
7788 /* Resolve WHERE statement in FORALL construct. */
7791 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7792 gfc_expr **var_expr)
7797 cblock = code->block;
7800 /* the assignment statement of a WHERE statement, or the first
7801 statement in where-body-construct of a WHERE construct */
7802 cnext = cblock->next;
7807 /* WHERE assignment statement */
7809 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7812 /* WHERE operator assignment statement */
7813 case EXEC_ASSIGN_CALL:
7814 resolve_call (cnext);
7815 if (!cnext->resolved_sym->attr.elemental)
7816 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7817 &cnext->ext.actual->expr->where);
7820 /* WHERE or WHERE construct is part of a where-body-construct */
7822 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7826 gfc_error ("Unsupported statement inside WHERE at %L",
7829 /* the next statement within the same where-body-construct */
7830 cnext = cnext->next;
7832 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7833 cblock = cblock->block;
7838 /* Traverse the FORALL body to check whether the following errors exist:
7839 1. For assignment, check if a many-to-one assignment happens.
7840 2. For WHERE statement, check the WHERE body to see if there is any
7841 many-to-one assignment. */
7844 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7848 c = code->block->next;
7854 case EXEC_POINTER_ASSIGN:
7855 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7858 case EXEC_ASSIGN_CALL:
7862 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7863 there is no need to handle it here. */
7867 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7872 /* The next statement in the FORALL body. */
7878 /* Counts the number of iterators needed inside a forall construct, including
7879 nested forall constructs. This is used to allocate the needed memory
7880 in gfc_resolve_forall. */
7883 gfc_count_forall_iterators (gfc_code *code)
7885 int max_iters, sub_iters, current_iters;
7886 gfc_forall_iterator *fa;
7888 gcc_assert(code->op == EXEC_FORALL);
7892 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7895 code = code->block->next;
7899 if (code->op == EXEC_FORALL)
7901 sub_iters = gfc_count_forall_iterators (code);
7902 if (sub_iters > max_iters)
7903 max_iters = sub_iters;
7908 return current_iters + max_iters;
7912 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7913 gfc_resolve_forall_body to resolve the FORALL body. */
7916 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7918 static gfc_expr **var_expr;
7919 static int total_var = 0;
7920 static int nvar = 0;
7922 gfc_forall_iterator *fa;
7927 /* Start to resolve a FORALL construct */
7928 if (forall_save == 0)
7930 /* Count the total number of FORALL index in the nested FORALL
7931 construct in order to allocate the VAR_EXPR with proper size. */
7932 total_var = gfc_count_forall_iterators (code);
7934 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7935 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7938 /* The information about FORALL iterator, including FORALL index start, end
7939 and stride. The FORALL index can not appear in start, end or stride. */
7940 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7942 /* Check if any outer FORALL index name is the same as the current
7944 for (i = 0; i < nvar; i++)
7946 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7948 gfc_error ("An outer FORALL construct already has an index "
7949 "with this name %L", &fa->var->where);
7953 /* Record the current FORALL index. */
7954 var_expr[nvar] = gfc_copy_expr (fa->var);
7958 /* No memory leak. */
7959 gcc_assert (nvar <= total_var);
7962 /* Resolve the FORALL body. */
7963 gfc_resolve_forall_body (code, nvar, var_expr);
7965 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7966 gfc_resolve_blocks (code->block, ns);
7970 /* Free only the VAR_EXPRs allocated in this frame. */
7971 for (i = nvar; i < tmp; i++)
7972 gfc_free_expr (var_expr[i]);
7976 /* We are in the outermost FORALL construct. */
7977 gcc_assert (forall_save == 0);
7979 /* VAR_EXPR is not needed any more. */
7980 gfc_free (var_expr);
7986 /* Resolve a BLOCK construct statement. */
7989 resolve_block_construct (gfc_code* code)
7991 /* Eventually, we may want to do some checks here or handle special stuff.
7992 But so far the only thing we can do is resolving the local namespace. */
7994 gfc_resolve (code->ext.ns);
7998 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8001 static void resolve_code (gfc_code *, gfc_namespace *);
8004 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8008 for (; b; b = b->block)
8010 t = gfc_resolve_expr (b->expr1);
8011 if (gfc_resolve_expr (b->expr2) == FAILURE)
8017 if (t == SUCCESS && b->expr1 != NULL
8018 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8019 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8026 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8027 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8032 resolve_branch (b->label1, b);
8036 resolve_block_construct (b);
8040 case EXEC_SELECT_TYPE:
8051 case EXEC_OMP_ATOMIC:
8052 case EXEC_OMP_CRITICAL:
8054 case EXEC_OMP_MASTER:
8055 case EXEC_OMP_ORDERED:
8056 case EXEC_OMP_PARALLEL:
8057 case EXEC_OMP_PARALLEL_DO:
8058 case EXEC_OMP_PARALLEL_SECTIONS:
8059 case EXEC_OMP_PARALLEL_WORKSHARE:
8060 case EXEC_OMP_SECTIONS:
8061 case EXEC_OMP_SINGLE:
8063 case EXEC_OMP_TASKWAIT:
8064 case EXEC_OMP_WORKSHARE:
8068 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8071 resolve_code (b->next, ns);
8076 /* Does everything to resolve an ordinary assignment. Returns true
8077 if this is an interface assignment. */
8079 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8089 if (gfc_extend_assign (code, ns) == SUCCESS)
8093 if (code->op == EXEC_ASSIGN_CALL)
8095 lhs = code->ext.actual->expr;
8096 rhsptr = &code->ext.actual->next->expr;
8100 gfc_actual_arglist* args;
8101 gfc_typebound_proc* tbp;
8103 gcc_assert (code->op == EXEC_COMPCALL);
8105 args = code->expr1->value.compcall.actual;
8107 rhsptr = &args->next->expr;
8109 tbp = code->expr1->value.compcall.tbp;
8110 gcc_assert (!tbp->is_generic);
8113 /* Make a temporary rhs when there is a default initializer
8114 and rhs is the same symbol as the lhs. */
8115 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8116 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8117 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8118 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8119 *rhsptr = gfc_get_parentheses (*rhsptr);
8128 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8129 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8130 &code->loc) == FAILURE)
8133 /* Handle the case of a BOZ literal on the RHS. */
8134 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8137 if (gfc_option.warn_surprising)
8138 gfc_warning ("BOZ literal at %L is bitwise transferred "
8139 "non-integer symbol '%s'", &code->loc,
8140 lhs->symtree->n.sym->name);
8142 if (!gfc_convert_boz (rhs, &lhs->ts))
8144 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8146 if (rc == ARITH_UNDERFLOW)
8147 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8148 ". This check can be disabled with the option "
8149 "-fno-range-check", &rhs->where);
8150 else if (rc == ARITH_OVERFLOW)
8151 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8152 ". This check can be disabled with the option "
8153 "-fno-range-check", &rhs->where);
8154 else if (rc == ARITH_NAN)
8155 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8156 ". This check can be disabled with the option "
8157 "-fno-range-check", &rhs->where);
8163 if (lhs->ts.type == BT_CHARACTER
8164 && gfc_option.warn_character_truncation)
8166 if (lhs->ts.u.cl != NULL
8167 && lhs->ts.u.cl->length != NULL
8168 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8169 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8171 if (rhs->expr_type == EXPR_CONSTANT)
8172 rlen = rhs->value.character.length;
8174 else if (rhs->ts.u.cl != NULL
8175 && rhs->ts.u.cl->length != NULL
8176 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8177 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8179 if (rlen && llen && rlen > llen)
8180 gfc_warning_now ("CHARACTER expression will be truncated "
8181 "in assignment (%d/%d) at %L",
8182 llen, rlen, &code->loc);
8185 /* Ensure that a vector index expression for the lvalue is evaluated
8186 to a temporary if the lvalue symbol is referenced in it. */
8189 for (ref = lhs->ref; ref; ref= ref->next)
8190 if (ref->type == REF_ARRAY)
8192 for (n = 0; n < ref->u.ar.dimen; n++)
8193 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8194 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8195 ref->u.ar.start[n]))
8197 = gfc_get_parentheses (ref->u.ar.start[n]);
8201 if (gfc_pure (NULL))
8203 if (gfc_impure_variable (lhs->symtree->n.sym))
8205 gfc_error ("Cannot assign to variable '%s' in PURE "
8207 lhs->symtree->n.sym->name,
8212 if (lhs->ts.type == BT_DERIVED
8213 && lhs->expr_type == EXPR_VARIABLE
8214 && lhs->ts.u.derived->attr.pointer_comp
8215 && rhs->expr_type == EXPR_VARIABLE
8216 && (gfc_impure_variable (rhs->symtree->n.sym)
8217 || gfc_is_coindexed (rhs)))
8220 if (gfc_is_coindexed (rhs))
8221 gfc_error ("Coindexed expression at %L is assigned to "
8222 "a derived type variable with a POINTER "
8223 "component in a PURE procedure",
8226 gfc_error ("The impure variable at %L is assigned to "
8227 "a derived type variable with a POINTER "
8228 "component in a PURE procedure (12.6)",
8233 /* Fortran 2008, C1283. */
8234 if (gfc_is_coindexed (lhs))
8236 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8237 "procedure", &rhs->where);
8243 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8244 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8245 if (lhs->ts.type == BT_CLASS)
8247 gfc_error ("Variable must not be polymorphic in assignment at %L",
8252 /* F2008, Section 7.2.1.2. */
8253 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8255 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8256 "component in assignment at %L", &lhs->where);
8260 gfc_check_assign (lhs, rhs, 1);
8265 /* Given a block of code, recursively resolve everything pointed to by this
8269 resolve_code (gfc_code *code, gfc_namespace *ns)
8271 int omp_workshare_save;
8276 frame.prev = cs_base;
8280 find_reachable_labels (code);
8282 for (; code; code = code->next)
8284 frame.current = code;
8285 forall_save = forall_flag;
8287 if (code->op == EXEC_FORALL)
8290 gfc_resolve_forall (code, ns, forall_save);
8293 else if (code->block)
8295 omp_workshare_save = -1;
8298 case EXEC_OMP_PARALLEL_WORKSHARE:
8299 omp_workshare_save = omp_workshare_flag;
8300 omp_workshare_flag = 1;
8301 gfc_resolve_omp_parallel_blocks (code, ns);
8303 case EXEC_OMP_PARALLEL:
8304 case EXEC_OMP_PARALLEL_DO:
8305 case EXEC_OMP_PARALLEL_SECTIONS:
8307 omp_workshare_save = omp_workshare_flag;
8308 omp_workshare_flag = 0;
8309 gfc_resolve_omp_parallel_blocks (code, ns);
8312 gfc_resolve_omp_do_blocks (code, ns);
8314 case EXEC_SELECT_TYPE:
8315 gfc_current_ns = code->ext.ns;
8316 gfc_resolve_blocks (code->block, gfc_current_ns);
8317 gfc_current_ns = ns;
8319 case EXEC_OMP_WORKSHARE:
8320 omp_workshare_save = omp_workshare_flag;
8321 omp_workshare_flag = 1;
8324 gfc_resolve_blocks (code->block, ns);
8328 if (omp_workshare_save != -1)
8329 omp_workshare_flag = omp_workshare_save;
8333 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8334 t = gfc_resolve_expr (code->expr1);
8335 forall_flag = forall_save;
8337 if (gfc_resolve_expr (code->expr2) == FAILURE)
8340 if (code->op == EXEC_ALLOCATE
8341 && gfc_resolve_expr (code->expr3) == FAILURE)
8347 case EXEC_END_BLOCK:
8351 case EXEC_ERROR_STOP:
8355 case EXEC_ASSIGN_CALL:
8360 case EXEC_SYNC_IMAGES:
8361 case EXEC_SYNC_MEMORY:
8362 resolve_sync (code);
8366 /* Keep track of which entry we are up to. */
8367 current_entry_id = code->ext.entry->id;
8371 resolve_where (code, NULL);
8375 if (code->expr1 != NULL)
8377 if (code->expr1->ts.type != BT_INTEGER)
8378 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8379 "INTEGER variable", &code->expr1->where);
8380 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8381 gfc_error ("Variable '%s' has not been assigned a target "
8382 "label at %L", code->expr1->symtree->n.sym->name,
8383 &code->expr1->where);
8386 resolve_branch (code->label1, code);
8390 if (code->expr1 != NULL
8391 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8392 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8393 "INTEGER return specifier", &code->expr1->where);
8396 case EXEC_INIT_ASSIGN:
8397 case EXEC_END_PROCEDURE:
8404 if (resolve_ordinary_assign (code, ns))
8406 if (code->op == EXEC_COMPCALL)
8413 case EXEC_LABEL_ASSIGN:
8414 if (code->label1->defined == ST_LABEL_UNKNOWN)
8415 gfc_error ("Label %d referenced at %L is never defined",
8416 code->label1->value, &code->label1->where);
8418 && (code->expr1->expr_type != EXPR_VARIABLE
8419 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8420 || code->expr1->symtree->n.sym->ts.kind
8421 != gfc_default_integer_kind
8422 || code->expr1->symtree->n.sym->as != NULL))
8423 gfc_error ("ASSIGN statement at %L requires a scalar "
8424 "default INTEGER variable", &code->expr1->where);
8427 case EXEC_POINTER_ASSIGN:
8431 gfc_check_pointer_assign (code->expr1, code->expr2);
8434 case EXEC_ARITHMETIC_IF:
8436 && code->expr1->ts.type != BT_INTEGER
8437 && code->expr1->ts.type != BT_REAL)
8438 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8439 "expression", &code->expr1->where);
8441 resolve_branch (code->label1, code);
8442 resolve_branch (code->label2, code);
8443 resolve_branch (code->label3, code);
8447 if (t == SUCCESS && code->expr1 != NULL
8448 && (code->expr1->ts.type != BT_LOGICAL
8449 || code->expr1->rank != 0))
8450 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8451 &code->expr1->where);
8456 resolve_call (code);
8461 resolve_typebound_subroutine (code);
8465 resolve_ppc_call (code);
8469 /* Select is complicated. Also, a SELECT construct could be
8470 a transformed computed GOTO. */
8471 resolve_select (code);
8474 case EXEC_SELECT_TYPE:
8475 resolve_select_type (code);
8479 gfc_resolve (code->ext.ns);
8483 if (code->ext.iterator != NULL)
8485 gfc_iterator *iter = code->ext.iterator;
8486 if (gfc_resolve_iterator (iter, true) != FAILURE)
8487 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8492 if (code->expr1 == NULL)
8493 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8495 && (code->expr1->rank != 0
8496 || code->expr1->ts.type != BT_LOGICAL))
8497 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8498 "a scalar LOGICAL expression", &code->expr1->where);
8503 resolve_allocate_deallocate (code, "ALLOCATE");
8507 case EXEC_DEALLOCATE:
8509 resolve_allocate_deallocate (code, "DEALLOCATE");
8514 if (gfc_resolve_open (code->ext.open) == FAILURE)
8517 resolve_branch (code->ext.open->err, code);
8521 if (gfc_resolve_close (code->ext.close) == FAILURE)
8524 resolve_branch (code->ext.close->err, code);
8527 case EXEC_BACKSPACE:
8531 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8534 resolve_branch (code->ext.filepos->err, code);
8538 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8541 resolve_branch (code->ext.inquire->err, code);
8545 gcc_assert (code->ext.inquire != NULL);
8546 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8549 resolve_branch (code->ext.inquire->err, code);
8553 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8556 resolve_branch (code->ext.wait->err, code);
8557 resolve_branch (code->ext.wait->end, code);
8558 resolve_branch (code->ext.wait->eor, code);
8563 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8566 resolve_branch (code->ext.dt->err, code);
8567 resolve_branch (code->ext.dt->end, code);
8568 resolve_branch (code->ext.dt->eor, code);
8572 resolve_transfer (code);
8576 resolve_forall_iterators (code->ext.forall_iterator);
8578 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8579 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8580 "expression", &code->expr1->where);
8583 case EXEC_OMP_ATOMIC:
8584 case EXEC_OMP_BARRIER:
8585 case EXEC_OMP_CRITICAL:
8586 case EXEC_OMP_FLUSH:
8588 case EXEC_OMP_MASTER:
8589 case EXEC_OMP_ORDERED:
8590 case EXEC_OMP_SECTIONS:
8591 case EXEC_OMP_SINGLE:
8592 case EXEC_OMP_TASKWAIT:
8593 case EXEC_OMP_WORKSHARE:
8594 gfc_resolve_omp_directive (code, ns);
8597 case EXEC_OMP_PARALLEL:
8598 case EXEC_OMP_PARALLEL_DO:
8599 case EXEC_OMP_PARALLEL_SECTIONS:
8600 case EXEC_OMP_PARALLEL_WORKSHARE:
8602 omp_workshare_save = omp_workshare_flag;
8603 omp_workshare_flag = 0;
8604 gfc_resolve_omp_directive (code, ns);
8605 omp_workshare_flag = omp_workshare_save;
8609 gfc_internal_error ("resolve_code(): Bad statement code");
8613 cs_base = frame.prev;
8617 /* Resolve initial values and make sure they are compatible with
8621 resolve_values (gfc_symbol *sym)
8623 if (sym->value == NULL)
8626 if (gfc_resolve_expr (sym->value) == FAILURE)
8629 gfc_check_assign_symbol (sym, sym->value);
8633 /* Verify the binding labels for common blocks that are BIND(C). The label
8634 for a BIND(C) common block must be identical in all scoping units in which
8635 the common block is declared. Further, the binding label can not collide
8636 with any other global entity in the program. */
8639 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8641 if (comm_block_tree->n.common->is_bind_c == 1)
8643 gfc_gsymbol *binding_label_gsym;
8644 gfc_gsymbol *comm_name_gsym;
8646 /* See if a global symbol exists by the common block's name. It may
8647 be NULL if the common block is use-associated. */
8648 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8649 comm_block_tree->n.common->name);
8650 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8651 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8652 "with the global entity '%s' at %L",
8653 comm_block_tree->n.common->binding_label,
8654 comm_block_tree->n.common->name,
8655 &(comm_block_tree->n.common->where),
8656 comm_name_gsym->name, &(comm_name_gsym->where));
8657 else if (comm_name_gsym != NULL
8658 && strcmp (comm_name_gsym->name,
8659 comm_block_tree->n.common->name) == 0)
8661 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8663 if (comm_name_gsym->binding_label == NULL)
8664 /* No binding label for common block stored yet; save this one. */
8665 comm_name_gsym->binding_label =
8666 comm_block_tree->n.common->binding_label;
8668 if (strcmp (comm_name_gsym->binding_label,
8669 comm_block_tree->n.common->binding_label) != 0)
8671 /* Common block names match but binding labels do not. */
8672 gfc_error ("Binding label '%s' for common block '%s' at %L "
8673 "does not match the binding label '%s' for common "
8675 comm_block_tree->n.common->binding_label,
8676 comm_block_tree->n.common->name,
8677 &(comm_block_tree->n.common->where),
8678 comm_name_gsym->binding_label,
8679 comm_name_gsym->name,
8680 &(comm_name_gsym->where));
8685 /* There is no binding label (NAME="") so we have nothing further to
8686 check and nothing to add as a global symbol for the label. */
8687 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8690 binding_label_gsym =
8691 gfc_find_gsymbol (gfc_gsym_root,
8692 comm_block_tree->n.common->binding_label);
8693 if (binding_label_gsym == NULL)
8695 /* Need to make a global symbol for the binding label to prevent
8696 it from colliding with another. */
8697 binding_label_gsym =
8698 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8699 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8700 binding_label_gsym->type = GSYM_COMMON;
8704 /* If comm_name_gsym is NULL, the name common block is use
8705 associated and the name could be colliding. */
8706 if (binding_label_gsym->type != GSYM_COMMON)
8707 gfc_error ("Binding label '%s' for common block '%s' at %L "
8708 "collides with the global entity '%s' at %L",
8709 comm_block_tree->n.common->binding_label,
8710 comm_block_tree->n.common->name,
8711 &(comm_block_tree->n.common->where),
8712 binding_label_gsym->name,
8713 &(binding_label_gsym->where));
8714 else if (comm_name_gsym != NULL
8715 && (strcmp (binding_label_gsym->name,
8716 comm_name_gsym->binding_label) != 0)
8717 && (strcmp (binding_label_gsym->sym_name,
8718 comm_name_gsym->name) != 0))
8719 gfc_error ("Binding label '%s' for common block '%s' at %L "
8720 "collides with global entity '%s' at %L",
8721 binding_label_gsym->name, binding_label_gsym->sym_name,
8722 &(comm_block_tree->n.common->where),
8723 comm_name_gsym->name, &(comm_name_gsym->where));
8731 /* Verify any BIND(C) derived types in the namespace so we can report errors
8732 for them once, rather than for each variable declared of that type. */
8735 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8737 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8738 && derived_sym->attr.is_bind_c == 1)
8739 verify_bind_c_derived_type (derived_sym);
8745 /* Verify that any binding labels used in a given namespace do not collide
8746 with the names or binding labels of any global symbols. */
8749 gfc_verify_binding_labels (gfc_symbol *sym)
8753 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8754 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8756 gfc_gsymbol *bind_c_sym;
8758 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8759 if (bind_c_sym != NULL
8760 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8762 if (sym->attr.if_source == IFSRC_DECL
8763 && (bind_c_sym->type != GSYM_SUBROUTINE
8764 && bind_c_sym->type != GSYM_FUNCTION)
8765 && ((sym->attr.contained == 1
8766 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8767 || (sym->attr.use_assoc == 1
8768 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8770 /* Make sure global procedures don't collide with anything. */
8771 gfc_error ("Binding label '%s' at %L collides with the global "
8772 "entity '%s' at %L", sym->binding_label,
8773 &(sym->declared_at), bind_c_sym->name,
8774 &(bind_c_sym->where));
8777 else if (sym->attr.contained == 0
8778 && (sym->attr.if_source == IFSRC_IFBODY
8779 && sym->attr.flavor == FL_PROCEDURE)
8780 && (bind_c_sym->sym_name != NULL
8781 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8783 /* Make sure procedures in interface bodies don't collide. */
8784 gfc_error ("Binding label '%s' in interface body at %L collides "
8785 "with the global entity '%s' at %L",
8787 &(sym->declared_at), bind_c_sym->name,
8788 &(bind_c_sym->where));
8791 else if (sym->attr.contained == 0
8792 && sym->attr.if_source == IFSRC_UNKNOWN)
8793 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8794 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8795 || sym->attr.use_assoc == 0)
8797 gfc_error ("Binding label '%s' at %L collides with global "
8798 "entity '%s' at %L", sym->binding_label,
8799 &(sym->declared_at), bind_c_sym->name,
8800 &(bind_c_sym->where));
8805 /* Clear the binding label to prevent checking multiple times. */
8806 sym->binding_label[0] = '\0';
8808 else if (bind_c_sym == NULL)
8810 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8811 bind_c_sym->where = sym->declared_at;
8812 bind_c_sym->sym_name = sym->name;
8814 if (sym->attr.use_assoc == 1)
8815 bind_c_sym->mod_name = sym->module;
8817 if (sym->ns->proc_name != NULL)
8818 bind_c_sym->mod_name = sym->ns->proc_name->name;
8820 if (sym->attr.contained == 0)
8822 if (sym->attr.subroutine)
8823 bind_c_sym->type = GSYM_SUBROUTINE;
8824 else if (sym->attr.function)
8825 bind_c_sym->type = GSYM_FUNCTION;
8833 /* Resolve an index expression. */
8836 resolve_index_expr (gfc_expr *e)
8838 if (gfc_resolve_expr (e) == FAILURE)
8841 if (gfc_simplify_expr (e, 0) == FAILURE)
8844 if (gfc_specification_expr (e) == FAILURE)
8850 /* Resolve a charlen structure. */
8853 resolve_charlen (gfc_charlen *cl)
8862 specification_expr = 1;
8864 if (resolve_index_expr (cl->length) == FAILURE)
8866 specification_expr = 0;
8870 /* "If the character length parameter value evaluates to a negative
8871 value, the length of character entities declared is zero." */
8872 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8874 if (gfc_option.warn_surprising)
8875 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8876 " the length has been set to zero",
8877 &cl->length->where, i);
8878 gfc_replace_expr (cl->length,
8879 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
8882 /* Check that the character length is not too large. */
8883 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8884 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8885 && cl->length->ts.type == BT_INTEGER
8886 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8888 gfc_error ("String length at %L is too large", &cl->length->where);
8896 /* Test for non-constant shape arrays. */
8899 is_non_constant_shape_array (gfc_symbol *sym)
8905 not_constant = false;
8906 if (sym->as != NULL)
8908 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8909 has not been simplified; parameter array references. Do the
8910 simplification now. */
8911 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
8913 e = sym->as->lower[i];
8914 if (e && (resolve_index_expr (e) == FAILURE
8915 || !gfc_is_constant_expr (e)))
8916 not_constant = true;
8917 e = sym->as->upper[i];
8918 if (e && (resolve_index_expr (e) == FAILURE
8919 || !gfc_is_constant_expr (e)))
8920 not_constant = true;
8923 return not_constant;
8926 /* Given a symbol and an initialization expression, add code to initialize
8927 the symbol to the function entry. */
8929 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8933 gfc_namespace *ns = sym->ns;
8935 /* Search for the function namespace if this is a contained
8936 function without an explicit result. */
8937 if (sym->attr.function && sym == sym->result
8938 && sym->name != sym->ns->proc_name->name)
8941 for (;ns; ns = ns->sibling)
8942 if (strcmp (ns->proc_name->name, sym->name) == 0)
8948 gfc_free_expr (init);
8952 /* Build an l-value expression for the result. */
8953 lval = gfc_lval_expr_from_sym (sym);
8955 /* Add the code at scope entry. */
8956 init_st = gfc_get_code ();
8957 init_st->next = ns->code;
8960 /* Assign the default initializer to the l-value. */
8961 init_st->loc = sym->declared_at;
8962 init_st->op = EXEC_INIT_ASSIGN;
8963 init_st->expr1 = lval;
8964 init_st->expr2 = init;
8967 /* Assign the default initializer to a derived type variable or result. */
8970 apply_default_init (gfc_symbol *sym)
8972 gfc_expr *init = NULL;
8974 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8977 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8978 init = gfc_default_initializer (&sym->ts);
8983 build_init_assign (sym, init);
8986 /* Build an initializer for a local integer, real, complex, logical, or
8987 character variable, based on the command line flags finit-local-zero,
8988 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8989 null if the symbol should not have a default initialization. */
8991 build_default_init_expr (gfc_symbol *sym)
8994 gfc_expr *init_expr;
8997 /* These symbols should never have a default initialization. */
8998 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
8999 || sym->attr.external
9001 || sym->attr.pointer
9002 || sym->attr.in_equivalence
9003 || sym->attr.in_common
9006 || sym->attr.cray_pointee
9007 || sym->attr.cray_pointer)
9010 /* Now we'll try to build an initializer expression. */
9011 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9014 /* We will only initialize integers, reals, complex, logicals, and
9015 characters, and only if the corresponding command-line flags
9016 were set. Otherwise, we free init_expr and return null. */
9017 switch (sym->ts.type)
9020 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9021 mpz_init_set_si (init_expr->value.integer,
9022 gfc_option.flag_init_integer_value);
9025 gfc_free_expr (init_expr);
9031 mpfr_init (init_expr->value.real);
9032 switch (gfc_option.flag_init_real)
9034 case GFC_INIT_REAL_SNAN:
9035 init_expr->is_snan = 1;
9037 case GFC_INIT_REAL_NAN:
9038 mpfr_set_nan (init_expr->value.real);
9041 case GFC_INIT_REAL_INF:
9042 mpfr_set_inf (init_expr->value.real, 1);
9045 case GFC_INIT_REAL_NEG_INF:
9046 mpfr_set_inf (init_expr->value.real, -1);
9049 case GFC_INIT_REAL_ZERO:
9050 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9054 gfc_free_expr (init_expr);
9061 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
9062 switch (gfc_option.flag_init_real)
9064 case GFC_INIT_REAL_SNAN:
9065 init_expr->is_snan = 1;
9067 case GFC_INIT_REAL_NAN:
9068 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9069 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9072 case GFC_INIT_REAL_INF:
9073 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9074 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9077 case GFC_INIT_REAL_NEG_INF:
9078 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9079 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9082 case GFC_INIT_REAL_ZERO:
9083 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9087 gfc_free_expr (init_expr);
9094 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9095 init_expr->value.logical = 0;
9096 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9097 init_expr->value.logical = 1;
9100 gfc_free_expr (init_expr);
9106 /* For characters, the length must be constant in order to
9107 create a default initializer. */
9108 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9109 && sym->ts.u.cl->length
9110 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9112 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9113 init_expr->value.character.length = char_len;
9114 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9115 for (i = 0; i < char_len; i++)
9116 init_expr->value.character.string[i]
9117 = (unsigned char) gfc_option.flag_init_character_value;
9121 gfc_free_expr (init_expr);
9127 gfc_free_expr (init_expr);
9133 /* Add an initialization expression to a local variable. */
9135 apply_default_init_local (gfc_symbol *sym)
9137 gfc_expr *init = NULL;
9139 /* The symbol should be a variable or a function return value. */
9140 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9141 || (sym->attr.function && sym->result != sym))
9144 /* Try to build the initializer expression. If we can't initialize
9145 this symbol, then init will be NULL. */
9146 init = build_default_init_expr (sym);
9150 /* For saved variables, we don't want to add an initializer at
9151 function entry, so we just add a static initializer. */
9152 if (sym->attr.save || sym->ns->save_all
9153 || gfc_option.flag_max_stack_var_size == 0)
9155 /* Don't clobber an existing initializer! */
9156 gcc_assert (sym->value == NULL);
9161 build_init_assign (sym, init);
9164 /* Resolution of common features of flavors variable and procedure. */
9167 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9169 /* Constraints on deferred shape variable. */
9170 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9172 if (sym->attr.allocatable)
9174 if (sym->attr.dimension)
9176 gfc_error ("Allocatable array '%s' at %L must have "
9177 "a deferred shape", sym->name, &sym->declared_at);
9180 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9181 "may not be ALLOCATABLE", sym->name,
9182 &sym->declared_at) == FAILURE)
9186 if (sym->attr.pointer && sym->attr.dimension)
9188 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9189 sym->name, &sym->declared_at);
9196 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9197 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9199 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9200 sym->name, &sym->declared_at);
9205 /* Constraints on polymorphic variables. */
9206 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9209 if (!gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9211 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9212 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9218 /* Assume that use associated symbols were checked in the module ns. */
9219 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9221 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9222 "or pointer", sym->name, &sym->declared_at);
9231 /* Additional checks for symbols with flavor variable and derived
9232 type. To be called from resolve_fl_variable. */
9235 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9237 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9239 /* Check to see if a derived type is blocked from being host
9240 associated by the presence of another class I symbol in the same
9241 namespace. 14.6.1.3 of the standard and the discussion on
9242 comp.lang.fortran. */
9243 if (sym->ns != sym->ts.u.derived->ns
9244 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9247 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9248 if (s && s->attr.flavor != FL_DERIVED)
9250 gfc_error ("The type '%s' cannot be host associated at %L "
9251 "because it is blocked by an incompatible object "
9252 "of the same name declared at %L",
9253 sym->ts.u.derived->name, &sym->declared_at,
9259 /* 4th constraint in section 11.3: "If an object of a type for which
9260 component-initialization is specified (R429) appears in the
9261 specification-part of a module and does not have the ALLOCATABLE
9262 or POINTER attribute, the object shall have the SAVE attribute."
9264 The check for initializers is performed with
9265 gfc_has_default_initializer because gfc_default_initializer generates
9266 a hidden default for allocatable components. */
9267 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9268 && sym->ns->proc_name->attr.flavor == FL_MODULE
9269 && !sym->ns->save_all && !sym->attr.save
9270 && !sym->attr.pointer && !sym->attr.allocatable
9271 && gfc_has_default_initializer (sym->ts.u.derived)
9272 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9273 "module variable '%s' at %L, needed due to "
9274 "the default initialization", sym->name,
9275 &sym->declared_at) == FAILURE)
9278 /* Assign default initializer. */
9279 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9280 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9282 sym->value = gfc_default_initializer (&sym->ts);
9289 /* Resolve symbols with flavor variable. */
9292 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9294 int no_init_flag, automatic_flag;
9296 const char *auto_save_msg;
9298 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9301 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9304 /* Set this flag to check that variables are parameters of all entries.
9305 This check is effected by the call to gfc_resolve_expr through
9306 is_non_constant_shape_array. */
9307 specification_expr = 1;
9309 if (sym->ns->proc_name
9310 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9311 || sym->ns->proc_name->attr.is_main_program)
9312 && !sym->attr.use_assoc
9313 && !sym->attr.allocatable
9314 && !sym->attr.pointer
9315 && is_non_constant_shape_array (sym))
9317 /* The shape of a main program or module array needs to be
9319 gfc_error ("The module or main program array '%s' at %L must "
9320 "have constant shape", sym->name, &sym->declared_at);
9321 specification_expr = 0;
9325 if (sym->ts.type == BT_CHARACTER)
9327 /* Make sure that character string variables with assumed length are
9329 e = sym->ts.u.cl->length;
9330 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9332 gfc_error ("Entity with assumed character length at %L must be a "
9333 "dummy argument or a PARAMETER", &sym->declared_at);
9337 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9339 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9343 if (!gfc_is_constant_expr (e)
9344 && !(e->expr_type == EXPR_VARIABLE
9345 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9346 && sym->ns->proc_name
9347 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9348 || sym->ns->proc_name->attr.is_main_program)
9349 && !sym->attr.use_assoc)
9351 gfc_error ("'%s' at %L must have constant character length "
9352 "in this context", sym->name, &sym->declared_at);
9357 if (sym->value == NULL && sym->attr.referenced)
9358 apply_default_init_local (sym); /* Try to apply a default initialization. */
9360 /* Determine if the symbol may not have an initializer. */
9361 no_init_flag = automatic_flag = 0;
9362 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9363 || sym->attr.intrinsic || sym->attr.result)
9365 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9366 && is_non_constant_shape_array (sym))
9368 no_init_flag = automatic_flag = 1;
9370 /* Also, they must not have the SAVE attribute.
9371 SAVE_IMPLICIT is checked below. */
9372 if (sym->attr.save == SAVE_EXPLICIT)
9374 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9379 /* Ensure that any initializer is simplified. */
9381 gfc_simplify_expr (sym->value, 1);
9383 /* Reject illegal initializers. */
9384 if (!sym->mark && sym->value)
9386 if (sym->attr.allocatable)
9387 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9388 sym->name, &sym->declared_at);
9389 else if (sym->attr.external)
9390 gfc_error ("External '%s' at %L cannot have an initializer",
9391 sym->name, &sym->declared_at);
9392 else if (sym->attr.dummy
9393 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9394 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9395 sym->name, &sym->declared_at);
9396 else if (sym->attr.intrinsic)
9397 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9398 sym->name, &sym->declared_at);
9399 else if (sym->attr.result)
9400 gfc_error ("Function result '%s' at %L cannot have an initializer",
9401 sym->name, &sym->declared_at);
9402 else if (automatic_flag)
9403 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9404 sym->name, &sym->declared_at);
9411 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9412 return resolve_fl_variable_derived (sym, no_init_flag);
9418 /* Resolve a procedure. */
9421 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9423 gfc_formal_arglist *arg;
9425 if (sym->attr.function
9426 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9429 if (sym->ts.type == BT_CHARACTER)
9431 gfc_charlen *cl = sym->ts.u.cl;
9433 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9434 && resolve_charlen (cl) == FAILURE)
9437 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9438 && sym->attr.proc == PROC_ST_FUNCTION)
9440 gfc_error ("Character-valued statement function '%s' at %L must "
9441 "have constant length", sym->name, &sym->declared_at);
9446 /* Ensure that derived type for are not of a private type. Internal
9447 module procedures are excluded by 2.2.3.3 - i.e., they are not
9448 externally accessible and can access all the objects accessible in
9450 if (!(sym->ns->parent
9451 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9452 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9454 gfc_interface *iface;
9456 for (arg = sym->formal; arg; arg = arg->next)
9459 && arg->sym->ts.type == BT_DERIVED
9460 && !arg->sym->ts.u.derived->attr.use_assoc
9461 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9462 arg->sym->ts.u.derived->ns->default_access)
9463 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9464 "PRIVATE type and cannot be a dummy argument"
9465 " of '%s', which is PUBLIC at %L",
9466 arg->sym->name, sym->name, &sym->declared_at)
9469 /* Stop this message from recurring. */
9470 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9475 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9476 PRIVATE to the containing module. */
9477 for (iface = sym->generic; iface; iface = iface->next)
9479 for (arg = iface->sym->formal; arg; arg = arg->next)
9482 && arg->sym->ts.type == BT_DERIVED
9483 && !arg->sym->ts.u.derived->attr.use_assoc
9484 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9485 arg->sym->ts.u.derived->ns->default_access)
9486 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9487 "'%s' in PUBLIC interface '%s' at %L "
9488 "takes dummy arguments of '%s' which is "
9489 "PRIVATE", iface->sym->name, sym->name,
9490 &iface->sym->declared_at,
9491 gfc_typename (&arg->sym->ts)) == FAILURE)
9493 /* Stop this message from recurring. */
9494 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9500 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9501 PRIVATE to the containing module. */
9502 for (iface = sym->generic; iface; iface = iface->next)
9504 for (arg = iface->sym->formal; arg; arg = arg->next)
9507 && arg->sym->ts.type == BT_DERIVED
9508 && !arg->sym->ts.u.derived->attr.use_assoc
9509 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9510 arg->sym->ts.u.derived->ns->default_access)
9511 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9512 "'%s' in PUBLIC interface '%s' at %L "
9513 "takes dummy arguments of '%s' which is "
9514 "PRIVATE", iface->sym->name, sym->name,
9515 &iface->sym->declared_at,
9516 gfc_typename (&arg->sym->ts)) == FAILURE)
9518 /* Stop this message from recurring. */
9519 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9526 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9527 && !sym->attr.proc_pointer)
9529 gfc_error ("Function '%s' at %L cannot have an initializer",
9530 sym->name, &sym->declared_at);
9534 /* An external symbol may not have an initializer because it is taken to be
9535 a procedure. Exception: Procedure Pointers. */
9536 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9538 gfc_error ("External object '%s' at %L may not have an initializer",
9539 sym->name, &sym->declared_at);
9543 /* An elemental function is required to return a scalar 12.7.1 */
9544 if (sym->attr.elemental && sym->attr.function && sym->as)
9546 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9547 "result", sym->name, &sym->declared_at);
9548 /* Reset so that the error only occurs once. */
9549 sym->attr.elemental = 0;
9553 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9554 char-len-param shall not be array-valued, pointer-valued, recursive
9555 or pure. ....snip... A character value of * may only be used in the
9556 following ways: (i) Dummy arg of procedure - dummy associates with
9557 actual length; (ii) To declare a named constant; or (iii) External
9558 function - but length must be declared in calling scoping unit. */
9559 if (sym->attr.function
9560 && sym->ts.type == BT_CHARACTER
9561 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9563 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9564 || (sym->attr.recursive) || (sym->attr.pure))
9566 if (sym->as && sym->as->rank)
9567 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9568 "array-valued", sym->name, &sym->declared_at);
9570 if (sym->attr.pointer)
9571 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9572 "pointer-valued", sym->name, &sym->declared_at);
9575 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9576 "pure", sym->name, &sym->declared_at);
9578 if (sym->attr.recursive)
9579 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9580 "recursive", sym->name, &sym->declared_at);
9585 /* Appendix B.2 of the standard. Contained functions give an
9586 error anyway. Fixed-form is likely to be F77/legacy. */
9587 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9588 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9589 "CHARACTER(*) function '%s' at %L",
9590 sym->name, &sym->declared_at);
9593 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9595 gfc_formal_arglist *curr_arg;
9596 int has_non_interop_arg = 0;
9598 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9599 sym->common_block) == FAILURE)
9601 /* Clear these to prevent looking at them again if there was an
9603 sym->attr.is_bind_c = 0;
9604 sym->attr.is_c_interop = 0;
9605 sym->ts.is_c_interop = 0;
9609 /* So far, no errors have been found. */
9610 sym->attr.is_c_interop = 1;
9611 sym->ts.is_c_interop = 1;
9614 curr_arg = sym->formal;
9615 while (curr_arg != NULL)
9617 /* Skip implicitly typed dummy args here. */
9618 if (curr_arg->sym->attr.implicit_type == 0)
9619 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9620 /* If something is found to fail, record the fact so we
9621 can mark the symbol for the procedure as not being
9622 BIND(C) to try and prevent multiple errors being
9624 has_non_interop_arg = 1;
9626 curr_arg = curr_arg->next;
9629 /* See if any of the arguments were not interoperable and if so, clear
9630 the procedure symbol to prevent duplicate error messages. */
9631 if (has_non_interop_arg != 0)
9633 sym->attr.is_c_interop = 0;
9634 sym->ts.is_c_interop = 0;
9635 sym->attr.is_bind_c = 0;
9639 if (!sym->attr.proc_pointer)
9641 if (sym->attr.save == SAVE_EXPLICIT)
9643 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9644 "in '%s' at %L", sym->name, &sym->declared_at);
9647 if (sym->attr.intent)
9649 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9650 "in '%s' at %L", sym->name, &sym->declared_at);
9653 if (sym->attr.subroutine && sym->attr.result)
9655 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9656 "in '%s' at %L", sym->name, &sym->declared_at);
9659 if (sym->attr.external && sym->attr.function
9660 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9661 || sym->attr.contained))
9663 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9664 "in '%s' at %L", sym->name, &sym->declared_at);
9667 if (strcmp ("ppr@", sym->name) == 0)
9669 gfc_error ("Procedure pointer result '%s' at %L "
9670 "is missing the pointer attribute",
9671 sym->ns->proc_name->name, &sym->declared_at);
9680 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9681 been defined and we now know their defined arguments, check that they fulfill
9682 the requirements of the standard for procedures used as finalizers. */
9685 gfc_resolve_finalizers (gfc_symbol* derived)
9687 gfc_finalizer* list;
9688 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9689 gfc_try result = SUCCESS;
9690 bool seen_scalar = false;
9692 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9695 /* Walk over the list of finalizer-procedures, check them, and if any one
9696 does not fit in with the standard's definition, print an error and remove
9697 it from the list. */
9698 prev_link = &derived->f2k_derived->finalizers;
9699 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9705 /* Skip this finalizer if we already resolved it. */
9706 if (list->proc_tree)
9708 prev_link = &(list->next);
9712 /* Check this exists and is a SUBROUTINE. */
9713 if (!list->proc_sym->attr.subroutine)
9715 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9716 list->proc_sym->name, &list->where);
9720 /* We should have exactly one argument. */
9721 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9723 gfc_error ("FINAL procedure at %L must have exactly one argument",
9727 arg = list->proc_sym->formal->sym;
9729 /* This argument must be of our type. */
9730 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9732 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9733 &arg->declared_at, derived->name);
9737 /* It must neither be a pointer nor allocatable nor optional. */
9738 if (arg->attr.pointer)
9740 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9744 if (arg->attr.allocatable)
9746 gfc_error ("Argument of FINAL procedure at %L must not be"
9747 " ALLOCATABLE", &arg->declared_at);
9750 if (arg->attr.optional)
9752 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9757 /* It must not be INTENT(OUT). */
9758 if (arg->attr.intent == INTENT_OUT)
9760 gfc_error ("Argument of FINAL procedure at %L must not be"
9761 " INTENT(OUT)", &arg->declared_at);
9765 /* Warn if the procedure is non-scalar and not assumed shape. */
9766 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9767 && arg->as->type != AS_ASSUMED_SHAPE)
9768 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9769 " shape argument", &arg->declared_at);
9771 /* Check that it does not match in kind and rank with a FINAL procedure
9772 defined earlier. To really loop over the *earlier* declarations,
9773 we need to walk the tail of the list as new ones were pushed at the
9775 /* TODO: Handle kind parameters once they are implemented. */
9776 my_rank = (arg->as ? arg->as->rank : 0);
9777 for (i = list->next; i; i = i->next)
9779 /* Argument list might be empty; that is an error signalled earlier,
9780 but we nevertheless continued resolving. */
9781 if (i->proc_sym->formal)
9783 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9784 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9785 if (i_rank == my_rank)
9787 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9788 " rank (%d) as '%s'",
9789 list->proc_sym->name, &list->where, my_rank,
9796 /* Is this the/a scalar finalizer procedure? */
9797 if (!arg->as || arg->as->rank == 0)
9800 /* Find the symtree for this procedure. */
9801 gcc_assert (!list->proc_tree);
9802 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9804 prev_link = &list->next;
9807 /* Remove wrong nodes immediately from the list so we don't risk any
9808 troubles in the future when they might fail later expectations. */
9812 *prev_link = list->next;
9813 gfc_free_finalizer (i);
9816 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9817 were nodes in the list, must have been for arrays. It is surely a good
9818 idea to have a scalar version there if there's something to finalize. */
9819 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9820 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9821 " defined at %L, suggest also scalar one",
9822 derived->name, &derived->declared_at);
9824 /* TODO: Remove this error when finalization is finished. */
9825 gfc_error ("Finalization at %L is not yet implemented",
9826 &derived->declared_at);
9832 /* Check that it is ok for the typebound procedure proc to override the
9836 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9839 const gfc_symbol* proc_target;
9840 const gfc_symbol* old_target;
9841 unsigned proc_pass_arg, old_pass_arg, argpos;
9842 gfc_formal_arglist* proc_formal;
9843 gfc_formal_arglist* old_formal;
9845 /* This procedure should only be called for non-GENERIC proc. */
9846 gcc_assert (!proc->n.tb->is_generic);
9848 /* If the overwritten procedure is GENERIC, this is an error. */
9849 if (old->n.tb->is_generic)
9851 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9852 old->name, &proc->n.tb->where);
9856 where = proc->n.tb->where;
9857 proc_target = proc->n.tb->u.specific->n.sym;
9858 old_target = old->n.tb->u.specific->n.sym;
9860 /* Check that overridden binding is not NON_OVERRIDABLE. */
9861 if (old->n.tb->non_overridable)
9863 gfc_error ("'%s' at %L overrides a procedure binding declared"
9864 " NON_OVERRIDABLE", proc->name, &where);
9868 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9869 if (!old->n.tb->deferred && proc->n.tb->deferred)
9871 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9872 " non-DEFERRED binding", proc->name, &where);
9876 /* If the overridden binding is PURE, the overriding must be, too. */
9877 if (old_target->attr.pure && !proc_target->attr.pure)
9879 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9880 proc->name, &where);
9884 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9885 is not, the overriding must not be either. */
9886 if (old_target->attr.elemental && !proc_target->attr.elemental)
9888 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9889 " ELEMENTAL", proc->name, &where);
9892 if (!old_target->attr.elemental && proc_target->attr.elemental)
9894 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9895 " be ELEMENTAL, either", proc->name, &where);
9899 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9901 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9903 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9904 " SUBROUTINE", proc->name, &where);
9908 /* If the overridden binding is a FUNCTION, the overriding must also be a
9909 FUNCTION and have the same characteristics. */
9910 if (old_target->attr.function)
9912 if (!proc_target->attr.function)
9914 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9915 " FUNCTION", proc->name, &where);
9919 /* FIXME: Do more comprehensive checking (including, for instance, the
9920 rank and array-shape). */
9921 gcc_assert (proc_target->result && old_target->result);
9922 if (!gfc_compare_types (&proc_target->result->ts,
9923 &old_target->result->ts))
9925 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9926 " matching result types", proc->name, &where);
9931 /* If the overridden binding is PUBLIC, the overriding one must not be
9933 if (old->n.tb->access == ACCESS_PUBLIC
9934 && proc->n.tb->access == ACCESS_PRIVATE)
9936 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9937 " PRIVATE", proc->name, &where);
9941 /* Compare the formal argument lists of both procedures. This is also abused
9942 to find the position of the passed-object dummy arguments of both
9943 bindings as at least the overridden one might not yet be resolved and we
9944 need those positions in the check below. */
9945 proc_pass_arg = old_pass_arg = 0;
9946 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9948 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9951 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9952 proc_formal && old_formal;
9953 proc_formal = proc_formal->next, old_formal = old_formal->next)
9955 if (proc->n.tb->pass_arg
9956 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9957 proc_pass_arg = argpos;
9958 if (old->n.tb->pass_arg
9959 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9960 old_pass_arg = argpos;
9962 /* Check that the names correspond. */
9963 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9965 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9966 " to match the corresponding argument of the overridden"
9967 " procedure", proc_formal->sym->name, proc->name, &where,
9968 old_formal->sym->name);
9972 /* Check that the types correspond if neither is the passed-object
9974 /* FIXME: Do more comprehensive testing here. */
9975 if (proc_pass_arg != argpos && old_pass_arg != argpos
9976 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9978 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9979 "in respect to the overridden procedure",
9980 proc_formal->sym->name, proc->name, &where);
9986 if (proc_formal || old_formal)
9988 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9989 " the overridden procedure", proc->name, &where);
9993 /* If the overridden binding is NOPASS, the overriding one must also be
9995 if (old->n.tb->nopass && !proc->n.tb->nopass)
9997 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
9998 " NOPASS", proc->name, &where);
10002 /* If the overridden binding is PASS(x), the overriding one must also be
10003 PASS and the passed-object dummy arguments must correspond. */
10004 if (!old->n.tb->nopass)
10006 if (proc->n.tb->nopass)
10008 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10009 " PASS", proc->name, &where);
10013 if (proc_pass_arg != old_pass_arg)
10015 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10016 " the same position as the passed-object dummy argument of"
10017 " the overridden procedure", proc->name, &where);
10026 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10029 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10030 const char* generic_name, locus where)
10035 gcc_assert (t1->specific && t2->specific);
10036 gcc_assert (!t1->specific->is_generic);
10037 gcc_assert (!t2->specific->is_generic);
10039 sym1 = t1->specific->u.specific->n.sym;
10040 sym2 = t2->specific->u.specific->n.sym;
10045 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10046 if (sym1->attr.subroutine != sym2->attr.subroutine
10047 || sym1->attr.function != sym2->attr.function)
10049 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10050 " GENERIC '%s' at %L",
10051 sym1->name, sym2->name, generic_name, &where);
10055 /* Compare the interfaces. */
10056 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10058 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10059 sym1->name, sym2->name, generic_name, &where);
10067 /* Worker function for resolving a generic procedure binding; this is used to
10068 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10070 The difference between those cases is finding possible inherited bindings
10071 that are overridden, as one has to look for them in tb_sym_root,
10072 tb_uop_root or tb_op, respectively. Thus the caller must already find
10073 the super-type and set p->overridden correctly. */
10076 resolve_tb_generic_targets (gfc_symbol* super_type,
10077 gfc_typebound_proc* p, const char* name)
10079 gfc_tbp_generic* target;
10080 gfc_symtree* first_target;
10081 gfc_symtree* inherited;
10083 gcc_assert (p && p->is_generic);
10085 /* Try to find the specific bindings for the symtrees in our target-list. */
10086 gcc_assert (p->u.generic);
10087 for (target = p->u.generic; target; target = target->next)
10088 if (!target->specific)
10090 gfc_typebound_proc* overridden_tbp;
10091 gfc_tbp_generic* g;
10092 const char* target_name;
10094 target_name = target->specific_st->name;
10096 /* Defined for this type directly. */
10097 if (target->specific_st->n.tb)
10099 target->specific = target->specific_st->n.tb;
10100 goto specific_found;
10103 /* Look for an inherited specific binding. */
10106 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10111 gcc_assert (inherited->n.tb);
10112 target->specific = inherited->n.tb;
10113 goto specific_found;
10117 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10118 " at %L", target_name, name, &p->where);
10121 /* Once we've found the specific binding, check it is not ambiguous with
10122 other specifics already found or inherited for the same GENERIC. */
10124 gcc_assert (target->specific);
10126 /* This must really be a specific binding! */
10127 if (target->specific->is_generic)
10129 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10130 " '%s' is GENERIC, too", name, &p->where, target_name);
10134 /* Check those already resolved on this type directly. */
10135 for (g = p->u.generic; g; g = g->next)
10136 if (g != target && g->specific
10137 && check_generic_tbp_ambiguity (target, g, name, p->where)
10141 /* Check for ambiguity with inherited specific targets. */
10142 for (overridden_tbp = p->overridden; overridden_tbp;
10143 overridden_tbp = overridden_tbp->overridden)
10144 if (overridden_tbp->is_generic)
10146 for (g = overridden_tbp->u.generic; g; g = g->next)
10148 gcc_assert (g->specific);
10149 if (check_generic_tbp_ambiguity (target, g,
10150 name, p->where) == FAILURE)
10156 /* If we attempt to "overwrite" a specific binding, this is an error. */
10157 if (p->overridden && !p->overridden->is_generic)
10159 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10160 " the same name", name, &p->where);
10164 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10165 all must have the same attributes here. */
10166 first_target = p->u.generic->specific->u.specific;
10167 gcc_assert (first_target);
10168 p->subroutine = first_target->n.sym->attr.subroutine;
10169 p->function = first_target->n.sym->attr.function;
10175 /* Resolve a GENERIC procedure binding for a derived type. */
10178 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10180 gfc_symbol* super_type;
10182 /* Find the overridden binding if any. */
10183 st->n.tb->overridden = NULL;
10184 super_type = gfc_get_derived_super_type (derived);
10187 gfc_symtree* overridden;
10188 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10191 if (overridden && overridden->n.tb)
10192 st->n.tb->overridden = overridden->n.tb;
10195 /* Resolve using worker function. */
10196 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10200 /* Retrieve the target-procedure of an operator binding and do some checks in
10201 common for intrinsic and user-defined type-bound operators. */
10204 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10206 gfc_symbol* target_proc;
10208 gcc_assert (target->specific && !target->specific->is_generic);
10209 target_proc = target->specific->u.specific->n.sym;
10210 gcc_assert (target_proc);
10212 /* All operator bindings must have a passed-object dummy argument. */
10213 if (target->specific->nopass)
10215 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10219 return target_proc;
10223 /* Resolve a type-bound intrinsic operator. */
10226 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10227 gfc_typebound_proc* p)
10229 gfc_symbol* super_type;
10230 gfc_tbp_generic* target;
10232 /* If there's already an error here, do nothing (but don't fail again). */
10236 /* Operators should always be GENERIC bindings. */
10237 gcc_assert (p->is_generic);
10239 /* Look for an overridden binding. */
10240 super_type = gfc_get_derived_super_type (derived);
10241 if (super_type && super_type->f2k_derived)
10242 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10245 p->overridden = NULL;
10247 /* Resolve general GENERIC properties using worker function. */
10248 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10251 /* Check the targets to be procedures of correct interface. */
10252 for (target = p->u.generic; target; target = target->next)
10254 gfc_symbol* target_proc;
10256 target_proc = get_checked_tb_operator_target (target, p->where);
10260 if (!gfc_check_operator_interface (target_proc, op, p->where))
10272 /* Resolve a type-bound user operator (tree-walker callback). */
10274 static gfc_symbol* resolve_bindings_derived;
10275 static gfc_try resolve_bindings_result;
10277 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10280 resolve_typebound_user_op (gfc_symtree* stree)
10282 gfc_symbol* super_type;
10283 gfc_tbp_generic* target;
10285 gcc_assert (stree && stree->n.tb);
10287 if (stree->n.tb->error)
10290 /* Operators should always be GENERIC bindings. */
10291 gcc_assert (stree->n.tb->is_generic);
10293 /* Find overridden procedure, if any. */
10294 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10295 if (super_type && super_type->f2k_derived)
10297 gfc_symtree* overridden;
10298 overridden = gfc_find_typebound_user_op (super_type, NULL,
10299 stree->name, true, NULL);
10301 if (overridden && overridden->n.tb)
10302 stree->n.tb->overridden = overridden->n.tb;
10305 stree->n.tb->overridden = NULL;
10307 /* Resolve basically using worker function. */
10308 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10312 /* Check the targets to be functions of correct interface. */
10313 for (target = stree->n.tb->u.generic; target; target = target->next)
10315 gfc_symbol* target_proc;
10317 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10321 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10328 resolve_bindings_result = FAILURE;
10329 stree->n.tb->error = 1;
10333 /* Resolve the type-bound procedures for a derived type. */
10336 resolve_typebound_procedure (gfc_symtree* stree)
10340 gfc_symbol* me_arg;
10341 gfc_symbol* super_type;
10342 gfc_component* comp;
10344 gcc_assert (stree);
10346 /* Undefined specific symbol from GENERIC target definition. */
10350 if (stree->n.tb->error)
10353 /* If this is a GENERIC binding, use that routine. */
10354 if (stree->n.tb->is_generic)
10356 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10362 /* Get the target-procedure to check it. */
10363 gcc_assert (!stree->n.tb->is_generic);
10364 gcc_assert (stree->n.tb->u.specific);
10365 proc = stree->n.tb->u.specific->n.sym;
10366 where = stree->n.tb->where;
10368 /* Default access should already be resolved from the parser. */
10369 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10371 /* It should be a module procedure or an external procedure with explicit
10372 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10373 if ((!proc->attr.subroutine && !proc->attr.function)
10374 || (proc->attr.proc != PROC_MODULE
10375 && proc->attr.if_source != IFSRC_IFBODY)
10376 || (proc->attr.abstract && !stree->n.tb->deferred))
10378 gfc_error ("'%s' must be a module procedure or an external procedure with"
10379 " an explicit interface at %L", proc->name, &where);
10382 stree->n.tb->subroutine = proc->attr.subroutine;
10383 stree->n.tb->function = proc->attr.function;
10385 /* Find the super-type of the current derived type. We could do this once and
10386 store in a global if speed is needed, but as long as not I believe this is
10387 more readable and clearer. */
10388 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10390 /* If PASS, resolve and check arguments if not already resolved / loaded
10391 from a .mod file. */
10392 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10394 if (stree->n.tb->pass_arg)
10396 gfc_formal_arglist* i;
10398 /* If an explicit passing argument name is given, walk the arg-list
10399 and look for it. */
10402 stree->n.tb->pass_arg_num = 1;
10403 for (i = proc->formal; i; i = i->next)
10405 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10410 ++stree->n.tb->pass_arg_num;
10415 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10417 proc->name, stree->n.tb->pass_arg, &where,
10418 stree->n.tb->pass_arg);
10424 /* Otherwise, take the first one; there should in fact be at least
10426 stree->n.tb->pass_arg_num = 1;
10429 gfc_error ("Procedure '%s' with PASS at %L must have at"
10430 " least one argument", proc->name, &where);
10433 me_arg = proc->formal->sym;
10436 /* Now check that the argument-type matches and the passed-object
10437 dummy argument is generally fine. */
10439 gcc_assert (me_arg);
10441 if (me_arg->ts.type != BT_CLASS)
10443 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10444 " at %L", proc->name, &where);
10448 if (CLASS_DATA (me_arg)->ts.u.derived
10449 != resolve_bindings_derived)
10451 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10452 " the derived-type '%s'", me_arg->name, proc->name,
10453 me_arg->name, &where, resolve_bindings_derived->name);
10457 gcc_assert (me_arg->ts.type == BT_CLASS);
10458 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
10460 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10461 " scalar", proc->name, &where);
10464 if (CLASS_DATA (me_arg)->attr.allocatable)
10466 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10467 " be ALLOCATABLE", proc->name, &where);
10470 if (CLASS_DATA (me_arg)->attr.class_pointer)
10472 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10473 " be POINTER", proc->name, &where);
10478 /* If we are extending some type, check that we don't override a procedure
10479 flagged NON_OVERRIDABLE. */
10480 stree->n.tb->overridden = NULL;
10483 gfc_symtree* overridden;
10484 overridden = gfc_find_typebound_proc (super_type, NULL,
10485 stree->name, true, NULL);
10487 if (overridden && overridden->n.tb)
10488 stree->n.tb->overridden = overridden->n.tb;
10490 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10494 /* See if there's a name collision with a component directly in this type. */
10495 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10496 if (!strcmp (comp->name, stree->name))
10498 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10500 stree->name, &where, resolve_bindings_derived->name);
10504 /* Try to find a name collision with an inherited component. */
10505 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10507 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10508 " component of '%s'",
10509 stree->name, &where, resolve_bindings_derived->name);
10513 stree->n.tb->error = 0;
10517 resolve_bindings_result = FAILURE;
10518 stree->n.tb->error = 1;
10522 resolve_typebound_procedures (gfc_symbol* derived)
10526 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10529 resolve_bindings_derived = derived;
10530 resolve_bindings_result = SUCCESS;
10532 if (derived->f2k_derived->tb_sym_root)
10533 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10534 &resolve_typebound_procedure);
10536 if (derived->f2k_derived->tb_uop_root)
10537 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10538 &resolve_typebound_user_op);
10540 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10542 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10543 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10545 resolve_bindings_result = FAILURE;
10548 return resolve_bindings_result;
10552 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10553 to give all identical derived types the same backend_decl. */
10555 add_dt_to_dt_list (gfc_symbol *derived)
10557 gfc_dt_list *dt_list;
10559 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10560 if (derived == dt_list->derived)
10563 if (dt_list == NULL)
10565 dt_list = gfc_get_dt_list ();
10566 dt_list->next = gfc_derived_types;
10567 dt_list->derived = derived;
10568 gfc_derived_types = dt_list;
10573 /* Ensure that a derived-type is really not abstract, meaning that every
10574 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10577 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10582 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10584 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10587 if (st->n.tb && st->n.tb->deferred)
10589 gfc_symtree* overriding;
10590 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10593 gcc_assert (overriding->n.tb);
10594 if (overriding->n.tb->deferred)
10596 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10597 " '%s' is DEFERRED and not overridden",
10598 sub->name, &sub->declared_at, st->name);
10607 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10609 /* The algorithm used here is to recursively travel up the ancestry of sub
10610 and for each ancestor-type, check all bindings. If any of them is
10611 DEFERRED, look it up starting from sub and see if the found (overriding)
10612 binding is not DEFERRED.
10613 This is not the most efficient way to do this, but it should be ok and is
10614 clearer than something sophisticated. */
10616 gcc_assert (ancestor && !sub->attr.abstract);
10618 if (!ancestor->attr.abstract)
10621 /* Walk bindings of this ancestor. */
10622 if (ancestor->f2k_derived)
10625 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10630 /* Find next ancestor type and recurse on it. */
10631 ancestor = gfc_get_derived_super_type (ancestor);
10633 return ensure_not_abstract (sub, ancestor);
10639 static void resolve_symbol (gfc_symbol *sym);
10642 /* Resolve the components of a derived type. */
10645 resolve_fl_derived (gfc_symbol *sym)
10647 gfc_symbol* super_type;
10651 super_type = gfc_get_derived_super_type (sym);
10653 if (sym->attr.is_class && sym->ts.u.derived == NULL)
10655 /* Fix up incomplete CLASS symbols. */
10656 gfc_component *data = gfc_find_component (sym, "$data", true, true);
10657 gfc_component *vptr = gfc_find_component (sym, "$vptr", true, true);
10658 if (vptr->ts.u.derived == NULL)
10660 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived, false);
10662 vptr->ts.u.derived = vtab->ts.u.derived;
10667 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10669 gfc_error ("As extending type '%s' at %L has a coarray component, "
10670 "parent type '%s' shall also have one", sym->name,
10671 &sym->declared_at, super_type->name);
10675 /* Ensure the extended type gets resolved before we do. */
10676 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10679 /* An ABSTRACT type must be extensible. */
10680 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10682 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10683 sym->name, &sym->declared_at);
10687 for (c = sym->components; c != NULL; c = c->next)
10690 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10691 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10693 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10694 "deferred shape", c->name, &c->loc);
10699 if (c->attr.codimension && c->ts.type == BT_DERIVED
10700 && c->ts.u.derived->ts.is_iso_c)
10702 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10703 "shall not be a coarray", c->name, &c->loc);
10708 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10709 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10710 || c->attr.allocatable))
10712 gfc_error ("Component '%s' at %L with coarray component "
10713 "shall be a nonpointer, nonallocatable scalar",
10718 if (c->attr.proc_pointer && c->ts.interface)
10720 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
10721 gfc_error ("Interface '%s', used by procedure pointer component "
10722 "'%s' at %L, is declared in a later PROCEDURE statement",
10723 c->ts.interface->name, c->name, &c->loc);
10725 /* Get the attributes from the interface (now resolved). */
10726 if (c->ts.interface->attr.if_source
10727 || c->ts.interface->attr.intrinsic)
10729 gfc_symbol *ifc = c->ts.interface;
10731 if (ifc->formal && !ifc->formal_ns)
10732 resolve_symbol (ifc);
10734 if (ifc->attr.intrinsic)
10735 resolve_intrinsic (ifc, &ifc->declared_at);
10739 c->ts = ifc->result->ts;
10740 c->attr.allocatable = ifc->result->attr.allocatable;
10741 c->attr.pointer = ifc->result->attr.pointer;
10742 c->attr.dimension = ifc->result->attr.dimension;
10743 c->as = gfc_copy_array_spec (ifc->result->as);
10748 c->attr.allocatable = ifc->attr.allocatable;
10749 c->attr.pointer = ifc->attr.pointer;
10750 c->attr.dimension = ifc->attr.dimension;
10751 c->as = gfc_copy_array_spec (ifc->as);
10753 c->ts.interface = ifc;
10754 c->attr.function = ifc->attr.function;
10755 c->attr.subroutine = ifc->attr.subroutine;
10756 gfc_copy_formal_args_ppc (c, ifc);
10758 c->attr.pure = ifc->attr.pure;
10759 c->attr.elemental = ifc->attr.elemental;
10760 c->attr.recursive = ifc->attr.recursive;
10761 c->attr.always_explicit = ifc->attr.always_explicit;
10762 c->attr.ext_attr |= ifc->attr.ext_attr;
10763 /* Replace symbols in array spec. */
10767 for (i = 0; i < c->as->rank; i++)
10769 gfc_expr_replace_comp (c->as->lower[i], c);
10770 gfc_expr_replace_comp (c->as->upper[i], c);
10773 /* Copy char length. */
10774 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10776 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10777 gfc_expr_replace_comp (cl->length, c);
10778 if (cl->length && !cl->resolved
10779 && gfc_resolve_expr (cl->length) == FAILURE)
10784 else if (c->ts.interface->name[0] != '\0' && !sym->attr.vtype)
10786 gfc_error ("Interface '%s' of procedure pointer component "
10787 "'%s' at %L must be explicit", c->ts.interface->name,
10792 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10794 /* Since PPCs are not implicitly typed, a PPC without an explicit
10795 interface must be a subroutine. */
10796 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10799 /* Procedure pointer components: Check PASS arg. */
10800 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
10801 && !sym->attr.vtype)
10803 gfc_symbol* me_arg;
10805 if (c->tb->pass_arg)
10807 gfc_formal_arglist* i;
10809 /* If an explicit passing argument name is given, walk the arg-list
10810 and look for it. */
10813 c->tb->pass_arg_num = 1;
10814 for (i = c->formal; i; i = i->next)
10816 if (!strcmp (i->sym->name, c->tb->pass_arg))
10821 c->tb->pass_arg_num++;
10826 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10827 "at %L has no argument '%s'", c->name,
10828 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10835 /* Otherwise, take the first one; there should in fact be at least
10837 c->tb->pass_arg_num = 1;
10840 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10841 "must have at least one argument",
10846 me_arg = c->formal->sym;
10849 /* Now check that the argument-type matches. */
10850 gcc_assert (me_arg);
10851 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10852 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10853 || (me_arg->ts.type == BT_CLASS
10854 && CLASS_DATA (me_arg)->ts.u.derived != sym))
10856 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10857 " the derived type '%s'", me_arg->name, c->name,
10858 me_arg->name, &c->loc, sym->name);
10863 /* Check for C453. */
10864 if (me_arg->attr.dimension)
10866 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10867 "must be scalar", me_arg->name, c->name, me_arg->name,
10873 if (me_arg->attr.pointer)
10875 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10876 "may not have the POINTER attribute", me_arg->name,
10877 c->name, me_arg->name, &c->loc);
10882 if (me_arg->attr.allocatable)
10884 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10885 "may not be ALLOCATABLE", me_arg->name, c->name,
10886 me_arg->name, &c->loc);
10891 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10892 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10893 " at %L", c->name, &c->loc);
10897 /* Check type-spec if this is not the parent-type component. */
10898 if ((!sym->attr.extension || c != sym->components)
10899 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10902 /* If this type is an extension, set the accessibility of the parent
10904 if (super_type && c == sym->components
10905 && strcmp (super_type->name, c->name) == 0)
10906 c->attr.access = super_type->attr.access;
10908 /* If this type is an extension, see if this component has the same name
10909 as an inherited type-bound procedure. */
10910 if (super_type && !sym->attr.is_class
10911 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10913 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10914 " inherited type-bound procedure",
10915 c->name, sym->name, &c->loc);
10919 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10921 if (c->ts.u.cl->length == NULL
10922 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10923 || !gfc_is_constant_expr (c->ts.u.cl->length))
10925 gfc_error ("Character length of component '%s' needs to "
10926 "be a constant specification expression at %L",
10928 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10933 if (c->ts.type == BT_DERIVED
10934 && sym->component_access != ACCESS_PRIVATE
10935 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10936 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10937 && !c->ts.u.derived->attr.use_assoc
10938 && !gfc_check_access (c->ts.u.derived->attr.access,
10939 c->ts.u.derived->ns->default_access)
10940 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10941 "is a PRIVATE type and cannot be a component of "
10942 "'%s', which is PUBLIC at %L", c->name,
10943 sym->name, &sym->declared_at) == FAILURE)
10946 if (sym->attr.sequence)
10948 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10950 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10951 "not have the SEQUENCE attribute",
10952 c->ts.u.derived->name, &sym->declared_at);
10957 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && c->attr.pointer
10958 && c->ts.u.derived->components == NULL
10959 && !c->ts.u.derived->attr.zero_comp)
10961 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10962 "that has not been declared", c->name, sym->name,
10967 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.pointer
10968 && CLASS_DATA (c)->ts.u.derived->components == NULL
10969 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
10971 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10972 "that has not been declared", c->name, sym->name,
10978 if (c->ts.type == BT_CLASS
10979 && !(CLASS_DATA (c)->attr.pointer || CLASS_DATA (c)->attr.allocatable))
10981 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10982 "or pointer", c->name, &c->loc);
10986 /* Ensure that all the derived type components are put on the
10987 derived type list; even in formal namespaces, where derived type
10988 pointer components might not have been declared. */
10989 if (c->ts.type == BT_DERIVED
10991 && c->ts.u.derived->components
10993 && sym != c->ts.u.derived)
10994 add_dt_to_dt_list (c->ts.u.derived);
10996 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
11000 for (i = 0; i < c->as->rank; i++)
11002 if (c->as->lower[i] == NULL
11003 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
11004 || !gfc_is_constant_expr (c->as->lower[i])
11005 || c->as->upper[i] == NULL
11006 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
11007 || !gfc_is_constant_expr (c->as->upper[i]))
11009 gfc_error ("Component '%s' of '%s' at %L must have "
11010 "constant array bounds",
11011 c->name, sym->name, &c->loc);
11017 /* Resolve the type-bound procedures. */
11018 if (resolve_typebound_procedures (sym) == FAILURE)
11021 /* Resolve the finalizer procedures. */
11022 if (gfc_resolve_finalizers (sym) == FAILURE)
11025 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11026 all DEFERRED bindings are overridden. */
11027 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11028 && ensure_not_abstract (sym, super_type) == FAILURE)
11031 /* Add derived type to the derived type list. */
11032 add_dt_to_dt_list (sym);
11039 resolve_fl_namelist (gfc_symbol *sym)
11044 /* Reject PRIVATE objects in a PUBLIC namelist. */
11045 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
11047 for (nl = sym->namelist; nl; nl = nl->next)
11049 if (!nl->sym->attr.use_assoc
11050 && !is_sym_host_assoc (nl->sym, sym->ns)
11051 && !gfc_check_access(nl->sym->attr.access,
11052 nl->sym->ns->default_access))
11054 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11055 "cannot be member of PUBLIC namelist '%s' at %L",
11056 nl->sym->name, sym->name, &sym->declared_at);
11060 /* Types with private components that came here by USE-association. */
11061 if (nl->sym->ts.type == BT_DERIVED
11062 && derived_inaccessible (nl->sym->ts.u.derived))
11064 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11065 "components and cannot be member of namelist '%s' at %L",
11066 nl->sym->name, sym->name, &sym->declared_at);
11070 /* Types with private components that are defined in the same module. */
11071 if (nl->sym->ts.type == BT_DERIVED
11072 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11073 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
11074 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
11075 nl->sym->ns->default_access))
11077 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11078 "cannot be a member of PUBLIC namelist '%s' at %L",
11079 nl->sym->name, sym->name, &sym->declared_at);
11085 for (nl = sym->namelist; nl; nl = nl->next)
11087 /* Reject namelist arrays of assumed shape. */
11088 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11089 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
11090 "must not have assumed shape in namelist "
11091 "'%s' at %L", nl->sym->name, sym->name,
11092 &sym->declared_at) == FAILURE)
11095 /* Reject namelist arrays that are not constant shape. */
11096 if (is_non_constant_shape_array (nl->sym))
11098 gfc_error ("NAMELIST array object '%s' must have constant "
11099 "shape in namelist '%s' at %L", nl->sym->name,
11100 sym->name, &sym->declared_at);
11104 /* Namelist objects cannot have allocatable or pointer components. */
11105 if (nl->sym->ts.type != BT_DERIVED)
11108 if (nl->sym->ts.u.derived->attr.alloc_comp)
11110 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11111 "have ALLOCATABLE components",
11112 nl->sym->name, sym->name, &sym->declared_at);
11116 if (nl->sym->ts.u.derived->attr.pointer_comp)
11118 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11119 "have POINTER components",
11120 nl->sym->name, sym->name, &sym->declared_at);
11126 /* 14.1.2 A module or internal procedure represent local entities
11127 of the same type as a namelist member and so are not allowed. */
11128 for (nl = sym->namelist; nl; nl = nl->next)
11130 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11133 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11134 if ((nl->sym == sym->ns->proc_name)
11136 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11140 if (nl->sym && nl->sym->name)
11141 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11142 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11144 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11145 "attribute in '%s' at %L", nlsym->name,
11146 &sym->declared_at);
11156 resolve_fl_parameter (gfc_symbol *sym)
11158 /* A parameter array's shape needs to be constant. */
11159 if (sym->as != NULL
11160 && (sym->as->type == AS_DEFERRED
11161 || is_non_constant_shape_array (sym)))
11163 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11164 "or of deferred shape", sym->name, &sym->declared_at);
11168 /* Make sure a parameter that has been implicitly typed still
11169 matches the implicit type, since PARAMETER statements can precede
11170 IMPLICIT statements. */
11171 if (sym->attr.implicit_type
11172 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11175 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11176 "later IMPLICIT type", sym->name, &sym->declared_at);
11180 /* Make sure the types of derived parameters are consistent. This
11181 type checking is deferred until resolution because the type may
11182 refer to a derived type from the host. */
11183 if (sym->ts.type == BT_DERIVED
11184 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11186 gfc_error ("Incompatible derived type in PARAMETER at %L",
11187 &sym->value->where);
11194 /* Do anything necessary to resolve a symbol. Right now, we just
11195 assume that an otherwise unknown symbol is a variable. This sort
11196 of thing commonly happens for symbols in module. */
11199 resolve_symbol (gfc_symbol *sym)
11201 int check_constant, mp_flag;
11202 gfc_symtree *symtree;
11203 gfc_symtree *this_symtree;
11207 /* Avoid double resolution of function result symbols. */
11208 if ((sym->result || sym->attr.result) && (sym->ns != gfc_current_ns))
11211 if (sym->attr.flavor == FL_UNKNOWN)
11214 /* If we find that a flavorless symbol is an interface in one of the
11215 parent namespaces, find its symtree in this namespace, free the
11216 symbol and set the symtree to point to the interface symbol. */
11217 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11219 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11220 if (symtree && symtree->n.sym->generic)
11222 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11226 gfc_free_symbol (sym);
11227 symtree->n.sym->refs++;
11228 this_symtree->n.sym = symtree->n.sym;
11233 /* Otherwise give it a flavor according to such attributes as
11235 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11236 sym->attr.flavor = FL_VARIABLE;
11239 sym->attr.flavor = FL_PROCEDURE;
11240 if (sym->attr.dimension)
11241 sym->attr.function = 1;
11245 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11246 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11248 if (sym->attr.procedure && sym->ts.interface
11249 && sym->attr.if_source != IFSRC_DECL)
11251 if (sym->ts.interface == sym)
11253 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11254 "interface", sym->name, &sym->declared_at);
11257 if (sym->ts.interface->attr.procedure)
11259 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11260 " in a later PROCEDURE statement", sym->ts.interface->name,
11261 sym->name,&sym->declared_at);
11265 /* Get the attributes from the interface (now resolved). */
11266 if (sym->ts.interface->attr.if_source
11267 || sym->ts.interface->attr.intrinsic)
11269 gfc_symbol *ifc = sym->ts.interface;
11270 resolve_symbol (ifc);
11272 if (ifc->attr.intrinsic)
11273 resolve_intrinsic (ifc, &ifc->declared_at);
11276 sym->ts = ifc->result->ts;
11279 sym->ts.interface = ifc;
11280 sym->attr.function = ifc->attr.function;
11281 sym->attr.subroutine = ifc->attr.subroutine;
11282 gfc_copy_formal_args (sym, ifc);
11284 sym->attr.allocatable = ifc->attr.allocatable;
11285 sym->attr.pointer = ifc->attr.pointer;
11286 sym->attr.pure = ifc->attr.pure;
11287 sym->attr.elemental = ifc->attr.elemental;
11288 sym->attr.dimension = ifc->attr.dimension;
11289 sym->attr.recursive = ifc->attr.recursive;
11290 sym->attr.always_explicit = ifc->attr.always_explicit;
11291 sym->attr.ext_attr |= ifc->attr.ext_attr;
11292 /* Copy array spec. */
11293 sym->as = gfc_copy_array_spec (ifc->as);
11297 for (i = 0; i < sym->as->rank; i++)
11299 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11300 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11303 /* Copy char length. */
11304 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11306 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11307 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11308 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
11309 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
11313 else if (sym->ts.interface->name[0] != '\0')
11315 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11316 sym->ts.interface->name, sym->name, &sym->declared_at);
11321 if (sym->attr.is_protected && !sym->attr.proc_pointer
11322 && (sym->attr.procedure || sym->attr.external))
11324 if (sym->attr.external)
11325 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11326 "at %L", &sym->declared_at);
11328 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11329 "at %L", &sym->declared_at);
11334 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11337 /* Symbols that are module procedures with results (functions) have
11338 the types and array specification copied for type checking in
11339 procedures that call them, as well as for saving to a module
11340 file. These symbols can't stand the scrutiny that their results
11342 mp_flag = (sym->result != NULL && sym->result != sym);
11345 /* Make sure that the intrinsic is consistent with its internal
11346 representation. This needs to be done before assigning a default
11347 type to avoid spurious warnings. */
11348 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11349 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11352 /* Assign default type to symbols that need one and don't have one. */
11353 if (sym->ts.type == BT_UNKNOWN)
11355 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11356 gfc_set_default_type (sym, 1, NULL);
11358 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11359 && !sym->attr.function && !sym->attr.subroutine
11360 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11361 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11363 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11365 /* The specific case of an external procedure should emit an error
11366 in the case that there is no implicit type. */
11368 gfc_set_default_type (sym, sym->attr.external, NULL);
11371 /* Result may be in another namespace. */
11372 resolve_symbol (sym->result);
11374 if (!sym->result->attr.proc_pointer)
11376 sym->ts = sym->result->ts;
11377 sym->as = gfc_copy_array_spec (sym->result->as);
11378 sym->attr.dimension = sym->result->attr.dimension;
11379 sym->attr.pointer = sym->result->attr.pointer;
11380 sym->attr.allocatable = sym->result->attr.allocatable;
11386 /* Assumed size arrays and assumed shape arrays must be dummy
11389 if (sym->as != NULL
11390 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11391 || sym->as->type == AS_ASSUMED_SHAPE)
11392 && sym->attr.dummy == 0)
11394 if (sym->as->type == AS_ASSUMED_SIZE)
11395 gfc_error ("Assumed size array at %L must be a dummy argument",
11396 &sym->declared_at);
11398 gfc_error ("Assumed shape array at %L must be a dummy argument",
11399 &sym->declared_at);
11403 /* Make sure symbols with known intent or optional are really dummy
11404 variable. Because of ENTRY statement, this has to be deferred
11405 until resolution time. */
11407 if (!sym->attr.dummy
11408 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11410 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11414 if (sym->attr.value && !sym->attr.dummy)
11416 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11417 "it is not a dummy argument", sym->name, &sym->declared_at);
11421 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11423 gfc_charlen *cl = sym->ts.u.cl;
11424 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11426 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11427 "attribute must have constant length",
11428 sym->name, &sym->declared_at);
11432 if (sym->ts.is_c_interop
11433 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11435 gfc_error ("C interoperable character dummy variable '%s' at %L "
11436 "with VALUE attribute must have length one",
11437 sym->name, &sym->declared_at);
11442 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11443 do this for something that was implicitly typed because that is handled
11444 in gfc_set_default_type. Handle dummy arguments and procedure
11445 definitions separately. Also, anything that is use associated is not
11446 handled here but instead is handled in the module it is declared in.
11447 Finally, derived type definitions are allowed to be BIND(C) since that
11448 only implies that they're interoperable, and they are checked fully for
11449 interoperability when a variable is declared of that type. */
11450 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11451 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11452 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11454 gfc_try t = SUCCESS;
11456 /* First, make sure the variable is declared at the
11457 module-level scope (J3/04-007, Section 15.3). */
11458 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11459 sym->attr.in_common == 0)
11461 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11462 "is neither a COMMON block nor declared at the "
11463 "module level scope", sym->name, &(sym->declared_at));
11466 else if (sym->common_head != NULL)
11468 t = verify_com_block_vars_c_interop (sym->common_head);
11472 /* If type() declaration, we need to verify that the components
11473 of the given type are all C interoperable, etc. */
11474 if (sym->ts.type == BT_DERIVED &&
11475 sym->ts.u.derived->attr.is_c_interop != 1)
11477 /* Make sure the user marked the derived type as BIND(C). If
11478 not, call the verify routine. This could print an error
11479 for the derived type more than once if multiple variables
11480 of that type are declared. */
11481 if (sym->ts.u.derived->attr.is_bind_c != 1)
11482 verify_bind_c_derived_type (sym->ts.u.derived);
11486 /* Verify the variable itself as C interoperable if it
11487 is BIND(C). It is not possible for this to succeed if
11488 the verify_bind_c_derived_type failed, so don't have to handle
11489 any error returned by verify_bind_c_derived_type. */
11490 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11491 sym->common_block);
11496 /* clear the is_bind_c flag to prevent reporting errors more than
11497 once if something failed. */
11498 sym->attr.is_bind_c = 0;
11503 /* If a derived type symbol has reached this point, without its
11504 type being declared, we have an error. Notice that most
11505 conditions that produce undefined derived types have already
11506 been dealt with. However, the likes of:
11507 implicit type(t) (t) ..... call foo (t) will get us here if
11508 the type is not declared in the scope of the implicit
11509 statement. Change the type to BT_UNKNOWN, both because it is so
11510 and to prevent an ICE. */
11511 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11512 && !sym->ts.u.derived->attr.zero_comp)
11514 gfc_error ("The derived type '%s' at %L is of type '%s', "
11515 "which has not been defined", sym->name,
11516 &sym->declared_at, sym->ts.u.derived->name);
11517 sym->ts.type = BT_UNKNOWN;
11521 /* Make sure that the derived type has been resolved and that the
11522 derived type is visible in the symbol's namespace, if it is a
11523 module function and is not PRIVATE. */
11524 if (sym->ts.type == BT_DERIVED
11525 && sym->ts.u.derived->attr.use_assoc
11526 && sym->ns->proc_name
11527 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11531 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11534 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11535 if (!ds && sym->attr.function
11536 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11538 symtree = gfc_new_symtree (&sym->ns->sym_root,
11539 sym->ts.u.derived->name);
11540 symtree->n.sym = sym->ts.u.derived;
11541 sym->ts.u.derived->refs++;
11545 /* Unless the derived-type declaration is use associated, Fortran 95
11546 does not allow public entries of private derived types.
11547 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11548 161 in 95-006r3. */
11549 if (sym->ts.type == BT_DERIVED
11550 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11551 && !sym->ts.u.derived->attr.use_assoc
11552 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11553 && !gfc_check_access (sym->ts.u.derived->attr.access,
11554 sym->ts.u.derived->ns->default_access)
11555 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11556 "of PRIVATE derived type '%s'",
11557 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11558 : "variable", sym->name, &sym->declared_at,
11559 sym->ts.u.derived->name) == FAILURE)
11562 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11563 default initialization is defined (5.1.2.4.4). */
11564 if (sym->ts.type == BT_DERIVED
11566 && sym->attr.intent == INTENT_OUT
11568 && sym->as->type == AS_ASSUMED_SIZE)
11570 for (c = sym->ts.u.derived->components; c; c = c->next)
11572 if (c->initializer)
11574 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11575 "ASSUMED SIZE and so cannot have a default initializer",
11576 sym->name, &sym->declared_at);
11583 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11584 || sym->attr.codimension)
11585 && sym->attr.result)
11586 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11587 "a coarray component", sym->name, &sym->declared_at);
11590 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11591 && sym->ts.u.derived->ts.is_iso_c)
11592 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11593 "shall not be a coarray", sym->name, &sym->declared_at);
11596 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11597 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11598 || sym->attr.allocatable))
11599 gfc_error ("Variable '%s' at %L with coarray component "
11600 "shall be a nonpointer, nonallocatable scalar",
11601 sym->name, &sym->declared_at);
11603 /* F2008, C526. The function-result case was handled above. */
11604 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11605 || sym->attr.codimension)
11606 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11607 || sym->ns->proc_name->attr.flavor == FL_MODULE
11608 || sym->ns->proc_name->attr.is_main_program
11609 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11610 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11611 "component and is not ALLOCATABLE, SAVE nor a "
11612 "dummy argument", sym->name, &sym->declared_at);
11613 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11614 else if (sym->attr.codimension && !sym->attr.allocatable
11615 && sym->as && sym->as->cotype == AS_DEFERRED)
11616 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11617 "deferred shape", sym->name, &sym->declared_at);
11618 else if (sym->attr.codimension && sym->attr.allocatable
11619 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11620 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11621 "deferred shape", sym->name, &sym->declared_at);
11625 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11626 || (sym->attr.codimension && sym->attr.allocatable))
11627 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11628 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11629 "allocatable coarray or have coarray components",
11630 sym->name, &sym->declared_at);
11632 if (sym->attr.codimension && sym->attr.dummy
11633 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11634 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11635 "procedure '%s'", sym->name, &sym->declared_at,
11636 sym->ns->proc_name->name);
11638 switch (sym->attr.flavor)
11641 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11646 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11651 if (resolve_fl_namelist (sym) == FAILURE)
11656 if (resolve_fl_parameter (sym) == FAILURE)
11664 /* Resolve array specifier. Check as well some constraints
11665 on COMMON blocks. */
11667 check_constant = sym->attr.in_common && !sym->attr.pointer;
11669 /* Set the formal_arg_flag so that check_conflict will not throw
11670 an error for host associated variables in the specification
11671 expression for an array_valued function. */
11672 if (sym->attr.function && sym->as)
11673 formal_arg_flag = 1;
11675 gfc_resolve_array_spec (sym->as, check_constant);
11677 formal_arg_flag = 0;
11679 /* Resolve formal namespaces. */
11680 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11681 && !sym->attr.contained && !sym->attr.intrinsic)
11682 gfc_resolve (sym->formal_ns);
11684 /* Make sure the formal namespace is present. */
11685 if (sym->formal && !sym->formal_ns)
11687 gfc_formal_arglist *formal = sym->formal;
11688 while (formal && !formal->sym)
11689 formal = formal->next;
11693 sym->formal_ns = formal->sym->ns;
11694 sym->formal_ns->refs++;
11698 /* Check threadprivate restrictions. */
11699 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11700 && (!sym->attr.in_common
11701 && sym->module == NULL
11702 && (sym->ns->proc_name == NULL
11703 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11704 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11706 /* If we have come this far we can apply default-initializers, as
11707 described in 14.7.5, to those variables that have not already
11708 been assigned one. */
11709 if (sym->ts.type == BT_DERIVED
11710 && sym->attr.referenced
11711 && sym->ns == gfc_current_ns
11713 && !sym->attr.allocatable
11714 && !sym->attr.alloc_comp)
11716 symbol_attribute *a = &sym->attr;
11718 if ((!a->save && !a->dummy && !a->pointer
11719 && !a->in_common && !a->use_assoc
11720 && !(a->function && sym != sym->result))
11721 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11722 apply_default_init (sym);
11725 /* If this symbol has a type-spec, check it. */
11726 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11727 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11728 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11734 /************* Resolve DATA statements *************/
11738 gfc_data_value *vnode;
11744 /* Advance the values structure to point to the next value in the data list. */
11747 next_data_value (void)
11749 while (mpz_cmp_ui (values.left, 0) == 0)
11752 if (values.vnode->next == NULL)
11755 values.vnode = values.vnode->next;
11756 mpz_set (values.left, values.vnode->repeat);
11764 check_data_variable (gfc_data_variable *var, locus *where)
11770 ar_type mark = AR_UNKNOWN;
11772 mpz_t section_index[GFC_MAX_DIMENSIONS];
11778 if (gfc_resolve_expr (var->expr) == FAILURE)
11782 mpz_init_set_si (offset, 0);
11785 if (e->expr_type != EXPR_VARIABLE)
11786 gfc_internal_error ("check_data_variable(): Bad expression");
11788 sym = e->symtree->n.sym;
11790 if (sym->ns->is_block_data && !sym->attr.in_common)
11792 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11793 sym->name, &sym->declared_at);
11796 if (e->ref == NULL && sym->as)
11798 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11799 " declaration", sym->name, where);
11803 has_pointer = sym->attr.pointer;
11805 for (ref = e->ref; ref; ref = ref->next)
11807 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11810 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11812 gfc_error ("DATA element '%s' at %L cannot have a coindex",
11818 && ref->type == REF_ARRAY
11819 && ref->u.ar.type != AR_FULL)
11821 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11822 "be a full array", sym->name, where);
11827 if (e->rank == 0 || has_pointer)
11829 mpz_init_set_ui (size, 1);
11836 /* Find the array section reference. */
11837 for (ref = e->ref; ref; ref = ref->next)
11839 if (ref->type != REF_ARRAY)
11841 if (ref->u.ar.type == AR_ELEMENT)
11847 /* Set marks according to the reference pattern. */
11848 switch (ref->u.ar.type)
11856 /* Get the start position of array section. */
11857 gfc_get_section_index (ar, section_index, &offset);
11862 gcc_unreachable ();
11865 if (gfc_array_size (e, &size) == FAILURE)
11867 gfc_error ("Nonconstant array section at %L in DATA statement",
11869 mpz_clear (offset);
11876 while (mpz_cmp_ui (size, 0) > 0)
11878 if (next_data_value () == FAILURE)
11880 gfc_error ("DATA statement at %L has more variables than values",
11886 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11890 /* If we have more than one element left in the repeat count,
11891 and we have more than one element left in the target variable,
11892 then create a range assignment. */
11893 /* FIXME: Only done for full arrays for now, since array sections
11895 if (mark == AR_FULL && ref && ref->next == NULL
11896 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11900 if (mpz_cmp (size, values.left) >= 0)
11902 mpz_init_set (range, values.left);
11903 mpz_sub (size, size, values.left);
11904 mpz_set_ui (values.left, 0);
11908 mpz_init_set (range, size);
11909 mpz_sub (values.left, values.left, size);
11910 mpz_set_ui (size, 0);
11913 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
11916 mpz_add (offset, offset, range);
11923 /* Assign initial value to symbol. */
11926 mpz_sub_ui (values.left, values.left, 1);
11927 mpz_sub_ui (size, size, 1);
11929 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11933 if (mark == AR_FULL)
11934 mpz_add_ui (offset, offset, 1);
11936 /* Modify the array section indexes and recalculate the offset
11937 for next element. */
11938 else if (mark == AR_SECTION)
11939 gfc_advance_section (section_index, ar, &offset);
11943 if (mark == AR_SECTION)
11945 for (i = 0; i < ar->dimen; i++)
11946 mpz_clear (section_index[i]);
11950 mpz_clear (offset);
11956 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11958 /* Iterate over a list of elements in a DATA statement. */
11961 traverse_data_list (gfc_data_variable *var, locus *where)
11964 iterator_stack frame;
11965 gfc_expr *e, *start, *end, *step;
11966 gfc_try retval = SUCCESS;
11968 mpz_init (frame.value);
11971 start = gfc_copy_expr (var->iter.start);
11972 end = gfc_copy_expr (var->iter.end);
11973 step = gfc_copy_expr (var->iter.step);
11975 if (gfc_simplify_expr (start, 1) == FAILURE
11976 || start->expr_type != EXPR_CONSTANT)
11978 gfc_error ("start of implied-do loop at %L could not be "
11979 "simplified to a constant value", &start->where);
11983 if (gfc_simplify_expr (end, 1) == FAILURE
11984 || end->expr_type != EXPR_CONSTANT)
11986 gfc_error ("end of implied-do loop at %L could not be "
11987 "simplified to a constant value", &start->where);
11991 if (gfc_simplify_expr (step, 1) == FAILURE
11992 || step->expr_type != EXPR_CONSTANT)
11994 gfc_error ("step of implied-do loop at %L could not be "
11995 "simplified to a constant value", &start->where);
12000 mpz_set (trip, end->value.integer);
12001 mpz_sub (trip, trip, start->value.integer);
12002 mpz_add (trip, trip, step->value.integer);
12004 mpz_div (trip, trip, step->value.integer);
12006 mpz_set (frame.value, start->value.integer);
12008 frame.prev = iter_stack;
12009 frame.variable = var->iter.var->symtree;
12010 iter_stack = &frame;
12012 while (mpz_cmp_ui (trip, 0) > 0)
12014 if (traverse_data_var (var->list, where) == FAILURE)
12020 e = gfc_copy_expr (var->expr);
12021 if (gfc_simplify_expr (e, 1) == FAILURE)
12028 mpz_add (frame.value, frame.value, step->value.integer);
12030 mpz_sub_ui (trip, trip, 1);
12034 mpz_clear (frame.value);
12037 gfc_free_expr (start);
12038 gfc_free_expr (end);
12039 gfc_free_expr (step);
12041 iter_stack = frame.prev;
12046 /* Type resolve variables in the variable list of a DATA statement. */
12049 traverse_data_var (gfc_data_variable *var, locus *where)
12053 for (; var; var = var->next)
12055 if (var->expr == NULL)
12056 t = traverse_data_list (var, where);
12058 t = check_data_variable (var, where);
12068 /* Resolve the expressions and iterators associated with a data statement.
12069 This is separate from the assignment checking because data lists should
12070 only be resolved once. */
12073 resolve_data_variables (gfc_data_variable *d)
12075 for (; d; d = d->next)
12077 if (d->list == NULL)
12079 if (gfc_resolve_expr (d->expr) == FAILURE)
12084 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12087 if (resolve_data_variables (d->list) == FAILURE)
12096 /* Resolve a single DATA statement. We implement this by storing a pointer to
12097 the value list into static variables, and then recursively traversing the
12098 variables list, expanding iterators and such. */
12101 resolve_data (gfc_data *d)
12104 if (resolve_data_variables (d->var) == FAILURE)
12107 values.vnode = d->value;
12108 if (d->value == NULL)
12109 mpz_set_ui (values.left, 0);
12111 mpz_set (values.left, d->value->repeat);
12113 if (traverse_data_var (d->var, &d->where) == FAILURE)
12116 /* At this point, we better not have any values left. */
12118 if (next_data_value () == SUCCESS)
12119 gfc_error ("DATA statement at %L has more values than variables",
12124 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12125 accessed by host or use association, is a dummy argument to a pure function,
12126 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12127 is storage associated with any such variable, shall not be used in the
12128 following contexts: (clients of this function). */
12130 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12131 procedure. Returns zero if assignment is OK, nonzero if there is a
12134 gfc_impure_variable (gfc_symbol *sym)
12139 if (sym->attr.use_assoc || sym->attr.in_common)
12142 /* Check if the symbol's ns is inside the pure procedure. */
12143 for (ns = gfc_current_ns; ns; ns = ns->parent)
12147 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12151 proc = sym->ns->proc_name;
12152 if (sym->attr.dummy && gfc_pure (proc)
12153 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12155 proc->attr.function))
12158 /* TODO: Sort out what can be storage associated, if anything, and include
12159 it here. In principle equivalences should be scanned but it does not
12160 seem to be possible to storage associate an impure variable this way. */
12165 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12166 current namespace is inside a pure procedure. */
12169 gfc_pure (gfc_symbol *sym)
12171 symbol_attribute attr;
12176 /* Check if the current namespace or one of its parents
12177 belongs to a pure procedure. */
12178 for (ns = gfc_current_ns; ns; ns = ns->parent)
12180 sym = ns->proc_name;
12184 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12192 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12196 /* Test whether the current procedure is elemental or not. */
12199 gfc_elemental (gfc_symbol *sym)
12201 symbol_attribute attr;
12204 sym = gfc_current_ns->proc_name;
12209 return attr.flavor == FL_PROCEDURE && attr.elemental;
12213 /* Warn about unused labels. */
12216 warn_unused_fortran_label (gfc_st_label *label)
12221 warn_unused_fortran_label (label->left);
12223 if (label->defined == ST_LABEL_UNKNOWN)
12226 switch (label->referenced)
12228 case ST_LABEL_UNKNOWN:
12229 gfc_warning ("Label %d at %L defined but not used", label->value,
12233 case ST_LABEL_BAD_TARGET:
12234 gfc_warning ("Label %d at %L defined but cannot be used",
12235 label->value, &label->where);
12242 warn_unused_fortran_label (label->right);
12246 /* Returns the sequence type of a symbol or sequence. */
12249 sequence_type (gfc_typespec ts)
12258 if (ts.u.derived->components == NULL)
12259 return SEQ_NONDEFAULT;
12261 result = sequence_type (ts.u.derived->components->ts);
12262 for (c = ts.u.derived->components->next; c; c = c->next)
12263 if (sequence_type (c->ts) != result)
12269 if (ts.kind != gfc_default_character_kind)
12270 return SEQ_NONDEFAULT;
12272 return SEQ_CHARACTER;
12275 if (ts.kind != gfc_default_integer_kind)
12276 return SEQ_NONDEFAULT;
12278 return SEQ_NUMERIC;
12281 if (!(ts.kind == gfc_default_real_kind
12282 || ts.kind == gfc_default_double_kind))
12283 return SEQ_NONDEFAULT;
12285 return SEQ_NUMERIC;
12288 if (ts.kind != gfc_default_complex_kind)
12289 return SEQ_NONDEFAULT;
12291 return SEQ_NUMERIC;
12294 if (ts.kind != gfc_default_logical_kind)
12295 return SEQ_NONDEFAULT;
12297 return SEQ_NUMERIC;
12300 return SEQ_NONDEFAULT;
12305 /* Resolve derived type EQUIVALENCE object. */
12308 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12310 gfc_component *c = derived->components;
12315 /* Shall not be an object of nonsequence derived type. */
12316 if (!derived->attr.sequence)
12318 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12319 "attribute to be an EQUIVALENCE object", sym->name,
12324 /* Shall not have allocatable components. */
12325 if (derived->attr.alloc_comp)
12327 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12328 "components to be an EQUIVALENCE object",sym->name,
12333 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
12335 gfc_error ("Derived type variable '%s' at %L with default "
12336 "initialization cannot be in EQUIVALENCE with a variable "
12337 "in COMMON", sym->name, &e->where);
12341 for (; c ; c = c->next)
12343 if (c->ts.type == BT_DERIVED
12344 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12347 /* Shall not be an object of sequence derived type containing a pointer
12348 in the structure. */
12349 if (c->attr.pointer)
12351 gfc_error ("Derived type variable '%s' at %L with pointer "
12352 "component(s) cannot be an EQUIVALENCE object",
12353 sym->name, &e->where);
12361 /* Resolve equivalence object.
12362 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12363 an allocatable array, an object of nonsequence derived type, an object of
12364 sequence derived type containing a pointer at any level of component
12365 selection, an automatic object, a function name, an entry name, a result
12366 name, a named constant, a structure component, or a subobject of any of
12367 the preceding objects. A substring shall not have length zero. A
12368 derived type shall not have components with default initialization nor
12369 shall two objects of an equivalence group be initialized.
12370 Either all or none of the objects shall have an protected attribute.
12371 The simple constraints are done in symbol.c(check_conflict) and the rest
12372 are implemented here. */
12375 resolve_equivalence (gfc_equiv *eq)
12378 gfc_symbol *first_sym;
12381 locus *last_where = NULL;
12382 seq_type eq_type, last_eq_type;
12383 gfc_typespec *last_ts;
12384 int object, cnt_protected;
12387 last_ts = &eq->expr->symtree->n.sym->ts;
12389 first_sym = eq->expr->symtree->n.sym;
12393 for (object = 1; eq; eq = eq->eq, object++)
12397 e->ts = e->symtree->n.sym->ts;
12398 /* match_varspec might not know yet if it is seeing
12399 array reference or substring reference, as it doesn't
12401 if (e->ref && e->ref->type == REF_ARRAY)
12403 gfc_ref *ref = e->ref;
12404 sym = e->symtree->n.sym;
12406 if (sym->attr.dimension)
12408 ref->u.ar.as = sym->as;
12412 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12413 if (e->ts.type == BT_CHARACTER
12415 && ref->type == REF_ARRAY
12416 && ref->u.ar.dimen == 1
12417 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12418 && ref->u.ar.stride[0] == NULL)
12420 gfc_expr *start = ref->u.ar.start[0];
12421 gfc_expr *end = ref->u.ar.end[0];
12424 /* Optimize away the (:) reference. */
12425 if (start == NULL && end == NULL)
12428 e->ref = ref->next;
12430 e->ref->next = ref->next;
12435 ref->type = REF_SUBSTRING;
12437 start = gfc_get_int_expr (gfc_default_integer_kind,
12439 ref->u.ss.start = start;
12440 if (end == NULL && e->ts.u.cl)
12441 end = gfc_copy_expr (e->ts.u.cl->length);
12442 ref->u.ss.end = end;
12443 ref->u.ss.length = e->ts.u.cl;
12450 /* Any further ref is an error. */
12453 gcc_assert (ref->type == REF_ARRAY);
12454 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12460 if (gfc_resolve_expr (e) == FAILURE)
12463 sym = e->symtree->n.sym;
12465 if (sym->attr.is_protected)
12467 if (cnt_protected > 0 && cnt_protected != object)
12469 gfc_error ("Either all or none of the objects in the "
12470 "EQUIVALENCE set at %L shall have the "
12471 "PROTECTED attribute",
12476 /* Shall not equivalence common block variables in a PURE procedure. */
12477 if (sym->ns->proc_name
12478 && sym->ns->proc_name->attr.pure
12479 && sym->attr.in_common)
12481 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12482 "object in the pure procedure '%s'",
12483 sym->name, &e->where, sym->ns->proc_name->name);
12487 /* Shall not be a named constant. */
12488 if (e->expr_type == EXPR_CONSTANT)
12490 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12491 "object", sym->name, &e->where);
12495 if (e->ts.type == BT_DERIVED
12496 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12499 /* Check that the types correspond correctly:
12501 A numeric sequence structure may be equivalenced to another sequence
12502 structure, an object of default integer type, default real type, double
12503 precision real type, default logical type such that components of the
12504 structure ultimately only become associated to objects of the same
12505 kind. A character sequence structure may be equivalenced to an object
12506 of default character kind or another character sequence structure.
12507 Other objects may be equivalenced only to objects of the same type and
12508 kind parameters. */
12510 /* Identical types are unconditionally OK. */
12511 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12512 goto identical_types;
12514 last_eq_type = sequence_type (*last_ts);
12515 eq_type = sequence_type (sym->ts);
12517 /* Since the pair of objects is not of the same type, mixed or
12518 non-default sequences can be rejected. */
12520 msg = "Sequence %s with mixed components in EQUIVALENCE "
12521 "statement at %L with different type objects";
12523 && last_eq_type == SEQ_MIXED
12524 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12526 || (eq_type == SEQ_MIXED
12527 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12528 &e->where) == FAILURE))
12531 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12532 "statement at %L with objects of different type";
12534 && last_eq_type == SEQ_NONDEFAULT
12535 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12536 last_where) == FAILURE)
12537 || (eq_type == SEQ_NONDEFAULT
12538 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12539 &e->where) == FAILURE))
12542 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12543 "EQUIVALENCE statement at %L";
12544 if (last_eq_type == SEQ_CHARACTER
12545 && eq_type != SEQ_CHARACTER
12546 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12547 &e->where) == FAILURE)
12550 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12551 "EQUIVALENCE statement at %L";
12552 if (last_eq_type == SEQ_NUMERIC
12553 && eq_type != SEQ_NUMERIC
12554 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12555 &e->where) == FAILURE)
12560 last_where = &e->where;
12565 /* Shall not be an automatic array. */
12566 if (e->ref->type == REF_ARRAY
12567 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12569 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12570 "an EQUIVALENCE object", sym->name, &e->where);
12577 /* Shall not be a structure component. */
12578 if (r->type == REF_COMPONENT)
12580 gfc_error ("Structure component '%s' at %L cannot be an "
12581 "EQUIVALENCE object",
12582 r->u.c.component->name, &e->where);
12586 /* A substring shall not have length zero. */
12587 if (r->type == REF_SUBSTRING)
12589 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12591 gfc_error ("Substring at %L has length zero",
12592 &r->u.ss.start->where);
12602 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12605 resolve_fntype (gfc_namespace *ns)
12607 gfc_entry_list *el;
12610 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12613 /* If there are any entries, ns->proc_name is the entry master
12614 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12616 sym = ns->entries->sym;
12618 sym = ns->proc_name;
12619 if (sym->result == sym
12620 && sym->ts.type == BT_UNKNOWN
12621 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12622 && !sym->attr.untyped)
12624 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12625 sym->name, &sym->declared_at);
12626 sym->attr.untyped = 1;
12629 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12630 && !sym->attr.contained
12631 && !gfc_check_access (sym->ts.u.derived->attr.access,
12632 sym->ts.u.derived->ns->default_access)
12633 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12635 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12636 "%L of PRIVATE type '%s'", sym->name,
12637 &sym->declared_at, sym->ts.u.derived->name);
12641 for (el = ns->entries->next; el; el = el->next)
12643 if (el->sym->result == el->sym
12644 && el->sym->ts.type == BT_UNKNOWN
12645 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12646 && !el->sym->attr.untyped)
12648 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12649 el->sym->name, &el->sym->declared_at);
12650 el->sym->attr.untyped = 1;
12656 /* 12.3.2.1.1 Defined operators. */
12659 check_uop_procedure (gfc_symbol *sym, locus where)
12661 gfc_formal_arglist *formal;
12663 if (!sym->attr.function)
12665 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12666 sym->name, &where);
12670 if (sym->ts.type == BT_CHARACTER
12671 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12672 && !(sym->result && sym->result->ts.u.cl
12673 && sym->result->ts.u.cl->length))
12675 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12676 "character length", sym->name, &where);
12680 formal = sym->formal;
12681 if (!formal || !formal->sym)
12683 gfc_error ("User operator procedure '%s' at %L must have at least "
12684 "one argument", sym->name, &where);
12688 if (formal->sym->attr.intent != INTENT_IN)
12690 gfc_error ("First argument of operator interface at %L must be "
12691 "INTENT(IN)", &where);
12695 if (formal->sym->attr.optional)
12697 gfc_error ("First argument of operator interface at %L cannot be "
12698 "optional", &where);
12702 formal = formal->next;
12703 if (!formal || !formal->sym)
12706 if (formal->sym->attr.intent != INTENT_IN)
12708 gfc_error ("Second argument of operator interface at %L must be "
12709 "INTENT(IN)", &where);
12713 if (formal->sym->attr.optional)
12715 gfc_error ("Second argument of operator interface at %L cannot be "
12716 "optional", &where);
12722 gfc_error ("Operator interface at %L must have, at most, two "
12723 "arguments", &where);
12731 gfc_resolve_uops (gfc_symtree *symtree)
12733 gfc_interface *itr;
12735 if (symtree == NULL)
12738 gfc_resolve_uops (symtree->left);
12739 gfc_resolve_uops (symtree->right);
12741 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12742 check_uop_procedure (itr->sym, itr->sym->declared_at);
12746 /* Examine all of the expressions associated with a program unit,
12747 assign types to all intermediate expressions, make sure that all
12748 assignments are to compatible types and figure out which names
12749 refer to which functions or subroutines. It doesn't check code
12750 block, which is handled by resolve_code. */
12753 resolve_types (gfc_namespace *ns)
12759 gfc_namespace* old_ns = gfc_current_ns;
12761 /* Check that all IMPLICIT types are ok. */
12762 if (!ns->seen_implicit_none)
12765 for (letter = 0; letter != GFC_LETTERS; ++letter)
12766 if (ns->set_flag[letter]
12767 && resolve_typespec_used (&ns->default_type[letter],
12768 &ns->implicit_loc[letter],
12773 gfc_current_ns = ns;
12775 resolve_entries (ns);
12777 resolve_common_vars (ns->blank_common.head, false);
12778 resolve_common_blocks (ns->common_root);
12780 resolve_contained_functions (ns);
12782 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12784 for (cl = ns->cl_list; cl; cl = cl->next)
12785 resolve_charlen (cl);
12787 gfc_traverse_ns (ns, resolve_symbol);
12789 resolve_fntype (ns);
12791 for (n = ns->contained; n; n = n->sibling)
12793 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12794 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12795 "also be PURE", n->proc_name->name,
12796 &n->proc_name->declared_at);
12802 gfc_check_interfaces (ns);
12804 gfc_traverse_ns (ns, resolve_values);
12810 for (d = ns->data; d; d = d->next)
12814 gfc_traverse_ns (ns, gfc_formalize_init_value);
12816 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12818 if (ns->common_root != NULL)
12819 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12821 for (eq = ns->equiv; eq; eq = eq->next)
12822 resolve_equivalence (eq);
12824 /* Warn about unused labels. */
12825 if (warn_unused_label)
12826 warn_unused_fortran_label (ns->st_labels);
12828 gfc_resolve_uops (ns->uop_root);
12830 gfc_current_ns = old_ns;
12834 /* Call resolve_code recursively. */
12837 resolve_codes (gfc_namespace *ns)
12840 bitmap_obstack old_obstack;
12842 for (n = ns->contained; n; n = n->sibling)
12845 gfc_current_ns = ns;
12847 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12848 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12851 /* Set to an out of range value. */
12852 current_entry_id = -1;
12854 old_obstack = labels_obstack;
12855 bitmap_obstack_initialize (&labels_obstack);
12857 resolve_code (ns->code, ns);
12859 bitmap_obstack_release (&labels_obstack);
12860 labels_obstack = old_obstack;
12864 /* This function is called after a complete program unit has been compiled.
12865 Its purpose is to examine all of the expressions associated with a program
12866 unit, assign types to all intermediate expressions, make sure that all
12867 assignments are to compatible types and figure out which names refer to
12868 which functions or subroutines. */
12871 gfc_resolve (gfc_namespace *ns)
12873 gfc_namespace *old_ns;
12874 code_stack *old_cs_base;
12880 old_ns = gfc_current_ns;
12881 old_cs_base = cs_base;
12883 resolve_types (ns);
12884 resolve_codes (ns);
12886 gfc_current_ns = old_ns;
12887 cs_base = old_cs_base;