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)
6150 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6152 /* First compare rank. */
6153 if (tail && e1->rank != tail->u.ar.as->rank)
6155 gfc_error ("Source-expr at %L must be scalar or have the "
6156 "same rank as the allocate-object at %L",
6157 &e1->where, &e2->where);
6168 for (i = 0; i < e1->rank; i++)
6170 if (tail->u.ar.end[i])
6172 mpz_set (s, tail->u.ar.end[i]->value.integer);
6173 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6174 mpz_add_ui (s, s, 1);
6178 mpz_set (s, tail->u.ar.start[i]->value.integer);
6181 if (mpz_cmp (e1->shape[i], s) != 0)
6183 gfc_error ("Source-expr at %L and allocate-object at %L must "
6184 "have the same shape", &e1->where, &e2->where);
6197 /* Resolve the expression in an ALLOCATE statement, doing the additional
6198 checks to see whether the expression is OK or not. The expression must
6199 have a trailing array reference that gives the size of the array. */
6202 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6204 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6206 symbol_attribute attr;
6207 gfc_ref *ref, *ref2;
6209 gfc_symbol *sym = NULL;
6214 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6215 check_intent_in = 1;
6217 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6218 checking of coarrays. */
6219 for (ref = e->ref; ref; ref = ref->next)
6220 if (ref->next == NULL)
6223 if (ref && ref->type == REF_ARRAY)
6224 ref->u.ar.in_allocate = true;
6226 if (gfc_resolve_expr (e) == FAILURE)
6229 /* Make sure the expression is allocatable or a pointer. If it is
6230 pointer, the next-to-last reference must be a pointer. */
6234 sym = e->symtree->n.sym;
6236 /* Check whether ultimate component is abstract and CLASS. */
6239 if (e->expr_type != EXPR_VARIABLE)
6242 attr = gfc_expr_attr (e);
6243 pointer = attr.pointer;
6244 dimension = attr.dimension;
6245 codimension = attr.codimension;
6249 if (sym->ts.type == BT_CLASS)
6251 allocatable = CLASS_DATA (sym)->attr.allocatable;
6252 pointer = CLASS_DATA (sym)->attr.pointer;
6253 dimension = CLASS_DATA (sym)->attr.dimension;
6254 codimension = CLASS_DATA (sym)->attr.codimension;
6255 is_abstract = CLASS_DATA (sym)->attr.abstract;
6259 allocatable = sym->attr.allocatable;
6260 pointer = sym->attr.pointer;
6261 dimension = sym->attr.dimension;
6262 codimension = sym->attr.codimension;
6265 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6268 check_intent_in = 0;
6273 if (ref->next != NULL)
6279 if (gfc_is_coindexed (e))
6281 gfc_error ("Coindexed allocatable object at %L",
6286 c = ref->u.c.component;
6287 if (c->ts.type == BT_CLASS)
6289 allocatable = CLASS_DATA (c)->attr.allocatable;
6290 pointer = CLASS_DATA (c)->attr.pointer;
6291 dimension = CLASS_DATA (c)->attr.dimension;
6292 codimension = CLASS_DATA (c)->attr.codimension;
6293 is_abstract = CLASS_DATA (c)->attr.abstract;
6297 allocatable = c->attr.allocatable;
6298 pointer = c->attr.pointer;
6299 dimension = c->attr.dimension;
6300 codimension = c->attr.codimension;
6301 is_abstract = c->attr.abstract;
6313 if (allocatable == 0 && pointer == 0)
6315 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6320 /* Some checks for the SOURCE tag. */
6323 /* Check F03:C631. */
6324 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6326 gfc_error ("Type of entity at %L is type incompatible with "
6327 "source-expr at %L", &e->where, &code->expr3->where);
6331 /* Check F03:C632 and restriction following Note 6.18. */
6332 if (code->expr3->rank > 0
6333 && conformable_arrays (code->expr3, e) == FAILURE)
6336 /* Check F03:C633. */
6337 if (code->expr3->ts.kind != e->ts.kind)
6339 gfc_error ("The allocate-object at %L and the source-expr at %L "
6340 "shall have the same kind type parameter",
6341 &e->where, &code->expr3->where);
6345 else if (is_abstract&& code->ext.alloc.ts.type == BT_UNKNOWN)
6347 gcc_assert (e->ts.type == BT_CLASS);
6348 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6349 "type-spec or SOURCE=", sym->name, &e->where);
6353 if (check_intent_in && sym->attr.intent == INTENT_IN)
6355 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6356 sym->name, &e->where);
6362 /* Add default initializer for those derived types that need them. */
6363 if (e->ts.type == BT_DERIVED
6364 && (init_e = gfc_default_initializer (&e->ts)))
6366 gfc_code *init_st = gfc_get_code ();
6367 init_st->loc = code->loc;
6368 init_st->op = EXEC_INIT_ASSIGN;
6369 init_st->expr1 = gfc_expr_to_initialize (e);
6370 init_st->expr2 = init_e;
6371 init_st->next = code->next;
6372 code->next = init_st;
6374 else if (e->ts.type == BT_CLASS
6375 && ((code->ext.alloc.ts.type == BT_UNKNOWN
6376 && (init_e = gfc_default_initializer (&CLASS_DATA (e)->ts)))
6377 || (code->ext.alloc.ts.type == BT_DERIVED
6378 && (init_e = gfc_default_initializer (&code->ext.alloc.ts)))))
6380 gfc_code *init_st = gfc_get_code ();
6381 init_st->loc = code->loc;
6382 init_st->op = EXEC_INIT_ASSIGN;
6383 init_st->expr1 = gfc_expr_to_initialize (e);
6384 init_st->expr2 = init_e;
6385 init_st->next = code->next;
6386 code->next = init_st;
6390 if (pointer || (dimension == 0 && codimension == 0))
6393 /* Make sure the next-to-last reference node is an array specification. */
6395 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6396 || (dimension && ref2->u.ar.dimen == 0))
6398 gfc_error ("Array specification required in ALLOCATE statement "
6399 "at %L", &e->where);
6403 /* Make sure that the array section reference makes sense in the
6404 context of an ALLOCATE specification. */
6408 if (codimension && ar->codimen == 0)
6410 gfc_error ("Coarray specification required in ALLOCATE statement "
6411 "at %L", &e->where);
6415 for (i = 0; i < ar->dimen; i++)
6417 if (ref2->u.ar.type == AR_ELEMENT)
6420 switch (ar->dimen_type[i])
6426 if (ar->start[i] != NULL
6427 && ar->end[i] != NULL
6428 && ar->stride[i] == NULL)
6431 /* Fall Through... */
6436 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6442 for (a = code->ext.alloc.list; a; a = a->next)
6444 sym = a->expr->symtree->n.sym;
6446 /* TODO - check derived type components. */
6447 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6450 if ((ar->start[i] != NULL
6451 && gfc_find_sym_in_expr (sym, ar->start[i]))
6452 || (ar->end[i] != NULL
6453 && gfc_find_sym_in_expr (sym, ar->end[i])))
6455 gfc_error ("'%s' must not appear in the array specification at "
6456 "%L in the same ALLOCATE statement where it is "
6457 "itself allocated", sym->name, &ar->where);
6463 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6465 if (ar->dimen_type[i] == DIMEN_ELEMENT
6466 || ar->dimen_type[i] == DIMEN_RANGE)
6468 if (i == (ar->dimen + ar->codimen - 1))
6470 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6471 "statement at %L", &e->where);
6477 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6478 && ar->stride[i] == NULL)
6481 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6486 if (codimension && ar->as->rank == 0)
6488 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6489 "at %L", &e->where);
6501 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6503 gfc_expr *stat, *errmsg, *pe, *qe;
6504 gfc_alloc *a, *p, *q;
6506 stat = code->expr1 ? code->expr1 : NULL;
6508 errmsg = code->expr2 ? code->expr2 : NULL;
6510 /* Check the stat variable. */
6513 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6514 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6515 stat->symtree->n.sym->name, &stat->where);
6517 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6518 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6521 if ((stat->ts.type != BT_INTEGER
6522 && !(stat->ref && (stat->ref->type == REF_ARRAY
6523 || stat->ref->type == REF_COMPONENT)))
6525 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6526 "variable", &stat->where);
6528 for (p = code->ext.alloc.list; p; p = p->next)
6529 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6530 gfc_error ("Stat-variable at %L shall not be %sd within "
6531 "the same %s statement", &stat->where, fcn, fcn);
6534 /* Check the errmsg variable. */
6538 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6541 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6542 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6543 errmsg->symtree->n.sym->name, &errmsg->where);
6545 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6546 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6549 if ((errmsg->ts.type != BT_CHARACTER
6551 && (errmsg->ref->type == REF_ARRAY
6552 || errmsg->ref->type == REF_COMPONENT)))
6553 || errmsg->rank > 0 )
6554 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6555 "variable", &errmsg->where);
6557 for (p = code->ext.alloc.list; p; p = p->next)
6558 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6559 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6560 "the same %s statement", &errmsg->where, fcn, fcn);
6563 /* Check that an allocate-object appears only once in the statement.
6564 FIXME: Checking derived types is disabled. */
6565 for (p = code->ext.alloc.list; p; p = p->next)
6568 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6569 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6571 for (q = p->next; q; q = q->next)
6574 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6575 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6576 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6577 gfc_error ("Allocate-object at %L also appears at %L",
6578 &pe->where, &qe->where);
6583 if (strcmp (fcn, "ALLOCATE") == 0)
6585 for (a = code->ext.alloc.list; a; a = a->next)
6586 resolve_allocate_expr (a->expr, code);
6590 for (a = code->ext.alloc.list; a; a = a->next)
6591 resolve_deallocate_expr (a->expr);
6596 /************ SELECT CASE resolution subroutines ************/
6598 /* Callback function for our mergesort variant. Determines interval
6599 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6600 op1 > op2. Assumes we're not dealing with the default case.
6601 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6602 There are nine situations to check. */
6605 compare_cases (const gfc_case *op1, const gfc_case *op2)
6609 if (op1->low == NULL) /* op1 = (:L) */
6611 /* op2 = (:N), so overlap. */
6613 /* op2 = (M:) or (M:N), L < M */
6614 if (op2->low != NULL
6615 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6618 else if (op1->high == NULL) /* op1 = (K:) */
6620 /* op2 = (M:), so overlap. */
6622 /* op2 = (:N) or (M:N), K > N */
6623 if (op2->high != NULL
6624 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6627 else /* op1 = (K:L) */
6629 if (op2->low == NULL) /* op2 = (:N), K > N */
6630 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6632 else if (op2->high == NULL) /* op2 = (M:), L < M */
6633 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6635 else /* op2 = (M:N) */
6639 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6642 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6651 /* Merge-sort a double linked case list, detecting overlap in the
6652 process. LIST is the head of the double linked case list before it
6653 is sorted. Returns the head of the sorted list if we don't see any
6654 overlap, or NULL otherwise. */
6657 check_case_overlap (gfc_case *list)
6659 gfc_case *p, *q, *e, *tail;
6660 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6662 /* If the passed list was empty, return immediately. */
6669 /* Loop unconditionally. The only exit from this loop is a return
6670 statement, when we've finished sorting the case list. */
6677 /* Count the number of merges we do in this pass. */
6680 /* Loop while there exists a merge to be done. */
6685 /* Count this merge. */
6688 /* Cut the list in two pieces by stepping INSIZE places
6689 forward in the list, starting from P. */
6692 for (i = 0; i < insize; i++)
6701 /* Now we have two lists. Merge them! */
6702 while (psize > 0 || (qsize > 0 && q != NULL))
6704 /* See from which the next case to merge comes from. */
6707 /* P is empty so the next case must come from Q. */
6712 else if (qsize == 0 || q == NULL)
6721 cmp = compare_cases (p, q);
6724 /* The whole case range for P is less than the
6732 /* The whole case range for Q is greater than
6733 the case range for P. */
6740 /* The cases overlap, or they are the same
6741 element in the list. Either way, we must
6742 issue an error and get the next case from P. */
6743 /* FIXME: Sort P and Q by line number. */
6744 gfc_error ("CASE label at %L overlaps with CASE "
6745 "label at %L", &p->where, &q->where);
6753 /* Add the next element to the merged list. */
6762 /* P has now stepped INSIZE places along, and so has Q. So
6763 they're the same. */
6768 /* If we have done only one merge or none at all, we've
6769 finished sorting the cases. */
6778 /* Otherwise repeat, merging lists twice the size. */
6784 /* Check to see if an expression is suitable for use in a CASE statement.
6785 Makes sure that all case expressions are scalar constants of the same
6786 type. Return FAILURE if anything is wrong. */
6789 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6791 if (e == NULL) return SUCCESS;
6793 if (e->ts.type != case_expr->ts.type)
6795 gfc_error ("Expression in CASE statement at %L must be of type %s",
6796 &e->where, gfc_basic_typename (case_expr->ts.type));
6800 /* C805 (R808) For a given case-construct, each case-value shall be of
6801 the same type as case-expr. For character type, length differences
6802 are allowed, but the kind type parameters shall be the same. */
6804 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6806 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6807 &e->where, case_expr->ts.kind);
6811 /* Convert the case value kind to that of case expression kind,
6814 if (e->ts.kind != case_expr->ts.kind)
6815 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6819 gfc_error ("Expression in CASE statement at %L must be scalar",
6828 /* Given a completely parsed select statement, we:
6830 - Validate all expressions and code within the SELECT.
6831 - Make sure that the selection expression is not of the wrong type.
6832 - Make sure that no case ranges overlap.
6833 - Eliminate unreachable cases and unreachable code resulting from
6834 removing case labels.
6836 The standard does allow unreachable cases, e.g. CASE (5:3). But
6837 they are a hassle for code generation, and to prevent that, we just
6838 cut them out here. This is not necessary for overlapping cases
6839 because they are illegal and we never even try to generate code.
6841 We have the additional caveat that a SELECT construct could have
6842 been a computed GOTO in the source code. Fortunately we can fairly
6843 easily work around that here: The case_expr for a "real" SELECT CASE
6844 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6845 we have to do is make sure that the case_expr is a scalar integer
6849 resolve_select (gfc_code *code)
6852 gfc_expr *case_expr;
6853 gfc_case *cp, *default_case, *tail, *head;
6854 int seen_unreachable;
6860 if (code->expr1 == NULL)
6862 /* This was actually a computed GOTO statement. */
6863 case_expr = code->expr2;
6864 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6865 gfc_error ("Selection expression in computed GOTO statement "
6866 "at %L must be a scalar integer expression",
6869 /* Further checking is not necessary because this SELECT was built
6870 by the compiler, so it should always be OK. Just move the
6871 case_expr from expr2 to expr so that we can handle computed
6872 GOTOs as normal SELECTs from here on. */
6873 code->expr1 = code->expr2;
6878 case_expr = code->expr1;
6880 type = case_expr->ts.type;
6881 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6883 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6884 &case_expr->where, gfc_typename (&case_expr->ts));
6886 /* Punt. Going on here just produce more garbage error messages. */
6890 if (case_expr->rank != 0)
6892 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6893 "expression", &case_expr->where);
6900 /* Raise a warning if an INTEGER case value exceeds the range of
6901 the case-expr. Later, all expressions will be promoted to the
6902 largest kind of all case-labels. */
6904 if (type == BT_INTEGER)
6905 for (body = code->block; body; body = body->block)
6906 for (cp = body->ext.case_list; cp; cp = cp->next)
6909 && gfc_check_integer_range (cp->low->value.integer,
6910 case_expr->ts.kind) != ARITH_OK)
6911 gfc_warning ("Expression in CASE statement at %L is "
6912 "not in the range of %s", &cp->low->where,
6913 gfc_typename (&case_expr->ts));
6916 && cp->low != cp->high
6917 && gfc_check_integer_range (cp->high->value.integer,
6918 case_expr->ts.kind) != ARITH_OK)
6919 gfc_warning ("Expression in CASE statement at %L is "
6920 "not in the range of %s", &cp->high->where,
6921 gfc_typename (&case_expr->ts));
6924 /* PR 19168 has a long discussion concerning a mismatch of the kinds
6925 of the SELECT CASE expression and its CASE values. Walk the lists
6926 of case values, and if we find a mismatch, promote case_expr to
6927 the appropriate kind. */
6929 if (type == BT_LOGICAL || type == BT_INTEGER)
6931 for (body = code->block; body; body = body->block)
6933 /* Walk the case label list. */
6934 for (cp = body->ext.case_list; cp; cp = cp->next)
6936 /* Intercept the DEFAULT case. It does not have a kind. */
6937 if (cp->low == NULL && cp->high == NULL)
6940 /* Unreachable case ranges are discarded, so ignore. */
6941 if (cp->low != NULL && cp->high != NULL
6942 && cp->low != cp->high
6943 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
6947 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
6948 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
6950 if (cp->high != NULL
6951 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
6952 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
6957 /* Assume there is no DEFAULT case. */
6958 default_case = NULL;
6963 for (body = code->block; body; body = body->block)
6965 /* Assume the CASE list is OK, and all CASE labels can be matched. */
6967 seen_unreachable = 0;
6969 /* Walk the case label list, making sure that all case labels
6971 for (cp = body->ext.case_list; cp; cp = cp->next)
6973 /* Count the number of cases in the whole construct. */
6976 /* Intercept the DEFAULT case. */
6977 if (cp->low == NULL && cp->high == NULL)
6979 if (default_case != NULL)
6981 gfc_error ("The DEFAULT CASE at %L cannot be followed "
6982 "by a second DEFAULT CASE at %L",
6983 &default_case->where, &cp->where);
6994 /* Deal with single value cases and case ranges. Errors are
6995 issued from the validation function. */
6996 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
6997 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7003 if (type == BT_LOGICAL
7004 && ((cp->low == NULL || cp->high == NULL)
7005 || cp->low != cp->high))
7007 gfc_error ("Logical range in CASE statement at %L is not "
7008 "allowed", &cp->low->where);
7013 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7016 value = cp->low->value.logical == 0 ? 2 : 1;
7017 if (value & seen_logical)
7019 gfc_error ("Constant logical value in CASE statement "
7020 "is repeated at %L",
7025 seen_logical |= value;
7028 if (cp->low != NULL && cp->high != NULL
7029 && cp->low != cp->high
7030 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7032 if (gfc_option.warn_surprising)
7033 gfc_warning ("Range specification at %L can never "
7034 "be matched", &cp->where);
7036 cp->unreachable = 1;
7037 seen_unreachable = 1;
7041 /* If the case range can be matched, it can also overlap with
7042 other cases. To make sure it does not, we put it in a
7043 double linked list here. We sort that with a merge sort
7044 later on to detect any overlapping cases. */
7048 head->right = head->left = NULL;
7053 tail->right->left = tail;
7060 /* It there was a failure in the previous case label, give up
7061 for this case label list. Continue with the next block. */
7065 /* See if any case labels that are unreachable have been seen.
7066 If so, we eliminate them. This is a bit of a kludge because
7067 the case lists for a single case statement (label) is a
7068 single forward linked lists. */
7069 if (seen_unreachable)
7071 /* Advance until the first case in the list is reachable. */
7072 while (body->ext.case_list != NULL
7073 && body->ext.case_list->unreachable)
7075 gfc_case *n = body->ext.case_list;
7076 body->ext.case_list = body->ext.case_list->next;
7078 gfc_free_case_list (n);
7081 /* Strip all other unreachable cases. */
7082 if (body->ext.case_list)
7084 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7086 if (cp->next->unreachable)
7088 gfc_case *n = cp->next;
7089 cp->next = cp->next->next;
7091 gfc_free_case_list (n);
7098 /* See if there were overlapping cases. If the check returns NULL,
7099 there was overlap. In that case we don't do anything. If head
7100 is non-NULL, we prepend the DEFAULT case. The sorted list can
7101 then used during code generation for SELECT CASE constructs with
7102 a case expression of a CHARACTER type. */
7105 head = check_case_overlap (head);
7107 /* Prepend the default_case if it is there. */
7108 if (head != NULL && default_case)
7110 default_case->left = NULL;
7111 default_case->right = head;
7112 head->left = default_case;
7116 /* Eliminate dead blocks that may be the result if we've seen
7117 unreachable case labels for a block. */
7118 for (body = code; body && body->block; body = body->block)
7120 if (body->block->ext.case_list == NULL)
7122 /* Cut the unreachable block from the code chain. */
7123 gfc_code *c = body->block;
7124 body->block = c->block;
7126 /* Kill the dead block, but not the blocks below it. */
7128 gfc_free_statements (c);
7132 /* More than two cases is legal but insane for logical selects.
7133 Issue a warning for it. */
7134 if (gfc_option.warn_surprising && type == BT_LOGICAL
7136 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7141 /* Check if a derived type is extensible. */
7144 gfc_type_is_extensible (gfc_symbol *sym)
7146 return !(sym->attr.is_bind_c || sym->attr.sequence);
7150 /* Resolve a SELECT TYPE statement. */
7153 resolve_select_type (gfc_code *code)
7155 gfc_symbol *selector_type;
7156 gfc_code *body, *new_st, *if_st, *tail;
7157 gfc_code *class_is = NULL, *default_case = NULL;
7160 char name[GFC_MAX_SYMBOL_LEN];
7164 ns = code->ext.block.ns;
7167 /* Check for F03:C813. */
7168 if (code->expr1->ts.type != BT_CLASS
7169 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7171 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7172 "at %L", &code->loc);
7178 if (code->expr1->symtree->n.sym->attr.untyped)
7179 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7180 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7183 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7185 /* Loop over TYPE IS / CLASS IS cases. */
7186 for (body = code->block; body; body = body->block)
7188 c = body->ext.case_list;
7190 /* Check F03:C815. */
7191 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7192 && !gfc_type_is_extensible (c->ts.u.derived))
7194 gfc_error ("Derived type '%s' at %L must be extensible",
7195 c->ts.u.derived->name, &c->where);
7200 /* Check F03:C816. */
7201 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7202 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7204 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7205 c->ts.u.derived->name, &c->where, selector_type->name);
7210 /* Intercept the DEFAULT case. */
7211 if (c->ts.type == BT_UNKNOWN)
7213 /* Check F03:C818. */
7216 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7217 "by a second DEFAULT CASE at %L",
7218 &default_case->ext.case_list->where, &c->where);
7223 default_case = body;
7232 /* Insert assignment for selector variable. */
7233 new_st = gfc_get_code ();
7234 new_st->op = EXEC_ASSIGN;
7235 new_st->expr1 = gfc_copy_expr (code->expr1);
7236 new_st->expr2 = gfc_copy_expr (code->expr2);
7240 /* Put SELECT TYPE statement inside a BLOCK. */
7241 new_st = gfc_get_code ();
7242 new_st->op = code->op;
7243 new_st->expr1 = code->expr1;
7244 new_st->expr2 = code->expr2;
7245 new_st->block = code->block;
7249 ns->code->next = new_st;
7250 code->op = EXEC_BLOCK;
7251 code->ext.block.assoc = NULL;
7252 code->expr1 = code->expr2 = NULL;
7257 /* Transform to EXEC_SELECT. */
7258 code->op = EXEC_SELECT;
7259 gfc_add_component_ref (code->expr1, "$vptr");
7260 gfc_add_component_ref (code->expr1, "$hash");
7262 /* Loop over TYPE IS / CLASS IS cases. */
7263 for (body = code->block; body; body = body->block)
7265 c = body->ext.case_list;
7267 if (c->ts.type == BT_DERIVED)
7268 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7269 c->ts.u.derived->hash_value);
7271 else if (c->ts.type == BT_UNKNOWN)
7274 /* Assign temporary to selector. */
7275 if (c->ts.type == BT_CLASS)
7276 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7278 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7279 st = gfc_find_symtree (ns->sym_root, name);
7280 new_st = gfc_get_code ();
7281 new_st->expr1 = gfc_get_variable_expr (st);
7282 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7283 if (c->ts.type == BT_DERIVED)
7285 new_st->op = EXEC_POINTER_ASSIGN;
7286 gfc_add_component_ref (new_st->expr2, "$data");
7289 new_st->op = EXEC_POINTER_ASSIGN;
7290 new_st->next = body->next;
7291 body->next = new_st;
7294 /* Take out CLASS IS cases for separate treatment. */
7296 while (body && body->block)
7298 if (body->block->ext.case_list->ts.type == BT_CLASS)
7300 /* Add to class_is list. */
7301 if (class_is == NULL)
7303 class_is = body->block;
7308 for (tail = class_is; tail->block; tail = tail->block) ;
7309 tail->block = body->block;
7312 /* Remove from EXEC_SELECT list. */
7313 body->block = body->block->block;
7326 /* Add a default case to hold the CLASS IS cases. */
7327 for (tail = code; tail->block; tail = tail->block) ;
7328 tail->block = gfc_get_code ();
7330 tail->op = EXEC_SELECT_TYPE;
7331 tail->ext.case_list = gfc_get_case ();
7332 tail->ext.case_list->ts.type = BT_UNKNOWN;
7334 default_case = tail;
7337 /* More than one CLASS IS block? */
7338 if (class_is->block)
7342 /* Sort CLASS IS blocks by extension level. */
7346 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7349 /* F03:C817 (check for doubles). */
7350 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7351 == c2->ext.case_list->ts.u.derived->hash_value)
7353 gfc_error ("Double CLASS IS block in SELECT TYPE "
7354 "statement at %L", &c2->ext.case_list->where);
7357 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7358 < c2->ext.case_list->ts.u.derived->attr.extension)
7361 (*c1)->block = c2->block;
7371 /* Generate IF chain. */
7372 if_st = gfc_get_code ();
7373 if_st->op = EXEC_IF;
7375 for (body = class_is; body; body = body->block)
7377 new_st->block = gfc_get_code ();
7378 new_st = new_st->block;
7379 new_st->op = EXEC_IF;
7380 /* Set up IF condition: Call _gfortran_is_extension_of. */
7381 new_st->expr1 = gfc_get_expr ();
7382 new_st->expr1->expr_type = EXPR_FUNCTION;
7383 new_st->expr1->ts.type = BT_LOGICAL;
7384 new_st->expr1->ts.kind = 4;
7385 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7386 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7387 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7388 /* Set up arguments. */
7389 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7390 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7391 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7392 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived, true);
7393 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7394 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7395 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7396 new_st->next = body->next;
7398 if (default_case->next)
7400 new_st->block = gfc_get_code ();
7401 new_st = new_st->block;
7402 new_st->op = EXEC_IF;
7403 new_st->next = default_case->next;
7406 /* Replace CLASS DEFAULT code by the IF chain. */
7407 default_case->next = if_st;
7410 resolve_select (code);
7415 /* Resolve a transfer statement. This is making sure that:
7416 -- a derived type being transferred has only non-pointer components
7417 -- a derived type being transferred doesn't have private components, unless
7418 it's being transferred from the module where the type was defined
7419 -- we're not trying to transfer a whole assumed size array. */
7422 resolve_transfer (gfc_code *code)
7431 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7434 sym = exp->symtree->n.sym;
7437 /* Go to actual component transferred. */
7438 for (ref = code->expr1->ref; ref; ref = ref->next)
7439 if (ref->type == REF_COMPONENT)
7440 ts = &ref->u.c.component->ts;
7442 if (ts->type == BT_DERIVED)
7444 /* Check that transferred derived type doesn't contain POINTER
7446 if (ts->u.derived->attr.pointer_comp)
7448 gfc_error ("Data transfer element at %L cannot have "
7449 "POINTER components", &code->loc);
7453 if (ts->u.derived->attr.alloc_comp)
7455 gfc_error ("Data transfer element at %L cannot have "
7456 "ALLOCATABLE components", &code->loc);
7460 if (derived_inaccessible (ts->u.derived))
7462 gfc_error ("Data transfer element at %L cannot have "
7463 "PRIVATE components",&code->loc);
7468 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7469 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7471 gfc_error ("Data transfer element at %L cannot be a full reference to "
7472 "an assumed-size array", &code->loc);
7478 /*********** Toplevel code resolution subroutines ***********/
7480 /* Find the set of labels that are reachable from this block. We also
7481 record the last statement in each block. */
7484 find_reachable_labels (gfc_code *block)
7491 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7493 /* Collect labels in this block. We don't keep those corresponding
7494 to END {IF|SELECT}, these are checked in resolve_branch by going
7495 up through the code_stack. */
7496 for (c = block; c; c = c->next)
7498 if (c->here && c->op != EXEC_END_BLOCK)
7499 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7502 /* Merge with labels from parent block. */
7505 gcc_assert (cs_base->prev->reachable_labels);
7506 bitmap_ior_into (cs_base->reachable_labels,
7507 cs_base->prev->reachable_labels);
7513 resolve_sync (gfc_code *code)
7515 /* Check imageset. The * case matches expr1 == NULL. */
7518 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7519 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7520 "INTEGER expression", &code->expr1->where);
7521 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7522 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7523 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7524 &code->expr1->where);
7525 else if (code->expr1->expr_type == EXPR_ARRAY
7526 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7528 gfc_constructor *cons;
7529 cons = gfc_constructor_first (code->expr1->value.constructor);
7530 for (; cons; cons = gfc_constructor_next (cons))
7531 if (cons->expr->expr_type == EXPR_CONSTANT
7532 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7533 gfc_error ("Imageset argument at %L must between 1 and "
7534 "num_images()", &cons->expr->where);
7540 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7541 || code->expr2->expr_type != EXPR_VARIABLE))
7542 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7543 &code->expr2->where);
7547 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7548 || code->expr3->expr_type != EXPR_VARIABLE))
7549 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7550 &code->expr3->where);
7554 /* Given a branch to a label, see if the branch is conforming.
7555 The code node describes where the branch is located. */
7558 resolve_branch (gfc_st_label *label, gfc_code *code)
7565 /* Step one: is this a valid branching target? */
7567 if (label->defined == ST_LABEL_UNKNOWN)
7569 gfc_error ("Label %d referenced at %L is never defined", label->value,
7574 if (label->defined != ST_LABEL_TARGET)
7576 gfc_error ("Statement at %L is not a valid branch target statement "
7577 "for the branch statement at %L", &label->where, &code->loc);
7581 /* Step two: make sure this branch is not a branch to itself ;-) */
7583 if (code->here == label)
7585 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7589 /* Step three: See if the label is in the same block as the
7590 branching statement. The hard work has been done by setting up
7591 the bitmap reachable_labels. */
7593 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7595 /* Check now whether there is a CRITICAL construct; if so, check
7596 whether the label is still visible outside of the CRITICAL block,
7597 which is invalid. */
7598 for (stack = cs_base; stack; stack = stack->prev)
7599 if (stack->current->op == EXEC_CRITICAL
7600 && bitmap_bit_p (stack->reachable_labels, label->value))
7601 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7602 " at %L", &code->loc, &label->where);
7607 /* Step four: If we haven't found the label in the bitmap, it may
7608 still be the label of the END of the enclosing block, in which
7609 case we find it by going up the code_stack. */
7611 for (stack = cs_base; stack; stack = stack->prev)
7613 if (stack->current->next && stack->current->next->here == label)
7615 if (stack->current->op == EXEC_CRITICAL)
7617 /* Note: A label at END CRITICAL does not leave the CRITICAL
7618 construct as END CRITICAL is still part of it. */
7619 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7620 " at %L", &code->loc, &label->where);
7627 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7631 /* The label is not in an enclosing block, so illegal. This was
7632 allowed in Fortran 66, so we allow it as extension. No
7633 further checks are necessary in this case. */
7634 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7635 "as the GOTO statement at %L", &label->where,
7641 /* Check whether EXPR1 has the same shape as EXPR2. */
7644 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7646 mpz_t shape[GFC_MAX_DIMENSIONS];
7647 mpz_t shape2[GFC_MAX_DIMENSIONS];
7648 gfc_try result = FAILURE;
7651 /* Compare the rank. */
7652 if (expr1->rank != expr2->rank)
7655 /* Compare the size of each dimension. */
7656 for (i=0; i<expr1->rank; i++)
7658 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7661 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7664 if (mpz_cmp (shape[i], shape2[i]))
7668 /* When either of the two expression is an assumed size array, we
7669 ignore the comparison of dimension sizes. */
7674 for (i--; i >= 0; i--)
7676 mpz_clear (shape[i]);
7677 mpz_clear (shape2[i]);
7683 /* Check whether a WHERE assignment target or a WHERE mask expression
7684 has the same shape as the outmost WHERE mask expression. */
7687 resolve_where (gfc_code *code, gfc_expr *mask)
7693 cblock = code->block;
7695 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7696 In case of nested WHERE, only the outmost one is stored. */
7697 if (mask == NULL) /* outmost WHERE */
7699 else /* inner WHERE */
7706 /* Check if the mask-expr has a consistent shape with the
7707 outmost WHERE mask-expr. */
7708 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7709 gfc_error ("WHERE mask at %L has inconsistent shape",
7710 &cblock->expr1->where);
7713 /* the assignment statement of a WHERE statement, or the first
7714 statement in where-body-construct of a WHERE construct */
7715 cnext = cblock->next;
7720 /* WHERE assignment statement */
7723 /* Check shape consistent for WHERE assignment target. */
7724 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7725 gfc_error ("WHERE assignment target at %L has "
7726 "inconsistent shape", &cnext->expr1->where);
7730 case EXEC_ASSIGN_CALL:
7731 resolve_call (cnext);
7732 if (!cnext->resolved_sym->attr.elemental)
7733 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7734 &cnext->ext.actual->expr->where);
7737 /* WHERE or WHERE construct is part of a where-body-construct */
7739 resolve_where (cnext, e);
7743 gfc_error ("Unsupported statement inside WHERE at %L",
7746 /* the next statement within the same where-body-construct */
7747 cnext = cnext->next;
7749 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7750 cblock = cblock->block;
7755 /* Resolve assignment in FORALL construct.
7756 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7757 FORALL index variables. */
7760 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7764 for (n = 0; n < nvar; n++)
7766 gfc_symbol *forall_index;
7768 forall_index = var_expr[n]->symtree->n.sym;
7770 /* Check whether the assignment target is one of the FORALL index
7772 if ((code->expr1->expr_type == EXPR_VARIABLE)
7773 && (code->expr1->symtree->n.sym == forall_index))
7774 gfc_error ("Assignment to a FORALL index variable at %L",
7775 &code->expr1->where);
7778 /* If one of the FORALL index variables doesn't appear in the
7779 assignment variable, then there could be a many-to-one
7780 assignment. Emit a warning rather than an error because the
7781 mask could be resolving this problem. */
7782 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7783 gfc_warning ("The FORALL with index '%s' is not used on the "
7784 "left side of the assignment at %L and so might "
7785 "cause multiple assignment to this object",
7786 var_expr[n]->symtree->name, &code->expr1->where);
7792 /* Resolve WHERE statement in FORALL construct. */
7795 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7796 gfc_expr **var_expr)
7801 cblock = code->block;
7804 /* the assignment statement of a WHERE statement, or the first
7805 statement in where-body-construct of a WHERE construct */
7806 cnext = cblock->next;
7811 /* WHERE assignment statement */
7813 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7816 /* WHERE operator assignment statement */
7817 case EXEC_ASSIGN_CALL:
7818 resolve_call (cnext);
7819 if (!cnext->resolved_sym->attr.elemental)
7820 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7821 &cnext->ext.actual->expr->where);
7824 /* WHERE or WHERE construct is part of a where-body-construct */
7826 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7830 gfc_error ("Unsupported statement inside WHERE at %L",
7833 /* the next statement within the same where-body-construct */
7834 cnext = cnext->next;
7836 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7837 cblock = cblock->block;
7842 /* Traverse the FORALL body to check whether the following errors exist:
7843 1. For assignment, check if a many-to-one assignment happens.
7844 2. For WHERE statement, check the WHERE body to see if there is any
7845 many-to-one assignment. */
7848 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7852 c = code->block->next;
7858 case EXEC_POINTER_ASSIGN:
7859 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7862 case EXEC_ASSIGN_CALL:
7866 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7867 there is no need to handle it here. */
7871 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7876 /* The next statement in the FORALL body. */
7882 /* Counts the number of iterators needed inside a forall construct, including
7883 nested forall constructs. This is used to allocate the needed memory
7884 in gfc_resolve_forall. */
7887 gfc_count_forall_iterators (gfc_code *code)
7889 int max_iters, sub_iters, current_iters;
7890 gfc_forall_iterator *fa;
7892 gcc_assert(code->op == EXEC_FORALL);
7896 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7899 code = code->block->next;
7903 if (code->op == EXEC_FORALL)
7905 sub_iters = gfc_count_forall_iterators (code);
7906 if (sub_iters > max_iters)
7907 max_iters = sub_iters;
7912 return current_iters + max_iters;
7916 /* Given a FORALL construct, first resolve the FORALL iterator, then call
7917 gfc_resolve_forall_body to resolve the FORALL body. */
7920 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
7922 static gfc_expr **var_expr;
7923 static int total_var = 0;
7924 static int nvar = 0;
7926 gfc_forall_iterator *fa;
7931 /* Start to resolve a FORALL construct */
7932 if (forall_save == 0)
7934 /* Count the total number of FORALL index in the nested FORALL
7935 construct in order to allocate the VAR_EXPR with proper size. */
7936 total_var = gfc_count_forall_iterators (code);
7938 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
7939 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
7942 /* The information about FORALL iterator, including FORALL index start, end
7943 and stride. The FORALL index can not appear in start, end or stride. */
7944 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
7946 /* Check if any outer FORALL index name is the same as the current
7948 for (i = 0; i < nvar; i++)
7950 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
7952 gfc_error ("An outer FORALL construct already has an index "
7953 "with this name %L", &fa->var->where);
7957 /* Record the current FORALL index. */
7958 var_expr[nvar] = gfc_copy_expr (fa->var);
7962 /* No memory leak. */
7963 gcc_assert (nvar <= total_var);
7966 /* Resolve the FORALL body. */
7967 gfc_resolve_forall_body (code, nvar, var_expr);
7969 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
7970 gfc_resolve_blocks (code->block, ns);
7974 /* Free only the VAR_EXPRs allocated in this frame. */
7975 for (i = nvar; i < tmp; i++)
7976 gfc_free_expr (var_expr[i]);
7980 /* We are in the outermost FORALL construct. */
7981 gcc_assert (forall_save == 0);
7983 /* VAR_EXPR is not needed any more. */
7984 gfc_free (var_expr);
7990 /* Resolve a BLOCK construct statement. */
7993 resolve_block_construct (gfc_code* code)
7995 /* For an ASSOCIATE block, the associations (and their targets) are already
7996 resolved during gfc_resolve_symbol. */
7998 /* Resolve the BLOCK's namespace. */
7999 gfc_resolve (code->ext.block.ns);
8003 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8006 static void resolve_code (gfc_code *, gfc_namespace *);
8009 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8013 for (; b; b = b->block)
8015 t = gfc_resolve_expr (b->expr1);
8016 if (gfc_resolve_expr (b->expr2) == FAILURE)
8022 if (t == SUCCESS && b->expr1 != NULL
8023 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8024 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8031 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8032 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8037 resolve_branch (b->label1, b);
8041 resolve_block_construct (b);
8045 case EXEC_SELECT_TYPE:
8056 case EXEC_OMP_ATOMIC:
8057 case EXEC_OMP_CRITICAL:
8059 case EXEC_OMP_MASTER:
8060 case EXEC_OMP_ORDERED:
8061 case EXEC_OMP_PARALLEL:
8062 case EXEC_OMP_PARALLEL_DO:
8063 case EXEC_OMP_PARALLEL_SECTIONS:
8064 case EXEC_OMP_PARALLEL_WORKSHARE:
8065 case EXEC_OMP_SECTIONS:
8066 case EXEC_OMP_SINGLE:
8068 case EXEC_OMP_TASKWAIT:
8069 case EXEC_OMP_WORKSHARE:
8073 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8076 resolve_code (b->next, ns);
8081 /* Does everything to resolve an ordinary assignment. Returns true
8082 if this is an interface assignment. */
8084 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8094 if (gfc_extend_assign (code, ns) == SUCCESS)
8098 if (code->op == EXEC_ASSIGN_CALL)
8100 lhs = code->ext.actual->expr;
8101 rhsptr = &code->ext.actual->next->expr;
8105 gfc_actual_arglist* args;
8106 gfc_typebound_proc* tbp;
8108 gcc_assert (code->op == EXEC_COMPCALL);
8110 args = code->expr1->value.compcall.actual;
8112 rhsptr = &args->next->expr;
8114 tbp = code->expr1->value.compcall.tbp;
8115 gcc_assert (!tbp->is_generic);
8118 /* Make a temporary rhs when there is a default initializer
8119 and rhs is the same symbol as the lhs. */
8120 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8121 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8122 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8123 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8124 *rhsptr = gfc_get_parentheses (*rhsptr);
8133 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8134 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8135 &code->loc) == FAILURE)
8138 /* Handle the case of a BOZ literal on the RHS. */
8139 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8142 if (gfc_option.warn_surprising)
8143 gfc_warning ("BOZ literal at %L is bitwise transferred "
8144 "non-integer symbol '%s'", &code->loc,
8145 lhs->symtree->n.sym->name);
8147 if (!gfc_convert_boz (rhs, &lhs->ts))
8149 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8151 if (rc == ARITH_UNDERFLOW)
8152 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8153 ". This check can be disabled with the option "
8154 "-fno-range-check", &rhs->where);
8155 else if (rc == ARITH_OVERFLOW)
8156 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8157 ". This check can be disabled with the option "
8158 "-fno-range-check", &rhs->where);
8159 else if (rc == ARITH_NAN)
8160 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8161 ". This check can be disabled with the option "
8162 "-fno-range-check", &rhs->where);
8168 if (lhs->ts.type == BT_CHARACTER
8169 && gfc_option.warn_character_truncation)
8171 if (lhs->ts.u.cl != NULL
8172 && lhs->ts.u.cl->length != NULL
8173 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8174 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8176 if (rhs->expr_type == EXPR_CONSTANT)
8177 rlen = rhs->value.character.length;
8179 else if (rhs->ts.u.cl != NULL
8180 && rhs->ts.u.cl->length != NULL
8181 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8182 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8184 if (rlen && llen && rlen > llen)
8185 gfc_warning_now ("CHARACTER expression will be truncated "
8186 "in assignment (%d/%d) at %L",
8187 llen, rlen, &code->loc);
8190 /* Ensure that a vector index expression for the lvalue is evaluated
8191 to a temporary if the lvalue symbol is referenced in it. */
8194 for (ref = lhs->ref; ref; ref= ref->next)
8195 if (ref->type == REF_ARRAY)
8197 for (n = 0; n < ref->u.ar.dimen; n++)
8198 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8199 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8200 ref->u.ar.start[n]))
8202 = gfc_get_parentheses (ref->u.ar.start[n]);
8206 if (gfc_pure (NULL))
8208 if (gfc_impure_variable (lhs->symtree->n.sym))
8210 gfc_error ("Cannot assign to variable '%s' in PURE "
8212 lhs->symtree->n.sym->name,
8217 if (lhs->ts.type == BT_DERIVED
8218 && lhs->expr_type == EXPR_VARIABLE
8219 && lhs->ts.u.derived->attr.pointer_comp
8220 && rhs->expr_type == EXPR_VARIABLE
8221 && (gfc_impure_variable (rhs->symtree->n.sym)
8222 || gfc_is_coindexed (rhs)))
8225 if (gfc_is_coindexed (rhs))
8226 gfc_error ("Coindexed expression at %L is assigned to "
8227 "a derived type variable with a POINTER "
8228 "component in a PURE procedure",
8231 gfc_error ("The impure variable at %L is assigned to "
8232 "a derived type variable with a POINTER "
8233 "component in a PURE procedure (12.6)",
8238 /* Fortran 2008, C1283. */
8239 if (gfc_is_coindexed (lhs))
8241 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8242 "procedure", &rhs->where);
8248 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8249 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8250 if (lhs->ts.type == BT_CLASS)
8252 gfc_error ("Variable must not be polymorphic in assignment at %L",
8257 /* F2008, Section 7.2.1.2. */
8258 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8260 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8261 "component in assignment at %L", &lhs->where);
8265 gfc_check_assign (lhs, rhs, 1);
8270 /* Given a block of code, recursively resolve everything pointed to by this
8274 resolve_code (gfc_code *code, gfc_namespace *ns)
8276 int omp_workshare_save;
8281 frame.prev = cs_base;
8285 find_reachable_labels (code);
8287 for (; code; code = code->next)
8289 frame.current = code;
8290 forall_save = forall_flag;
8292 if (code->op == EXEC_FORALL)
8295 gfc_resolve_forall (code, ns, forall_save);
8298 else if (code->block)
8300 omp_workshare_save = -1;
8303 case EXEC_OMP_PARALLEL_WORKSHARE:
8304 omp_workshare_save = omp_workshare_flag;
8305 omp_workshare_flag = 1;
8306 gfc_resolve_omp_parallel_blocks (code, ns);
8308 case EXEC_OMP_PARALLEL:
8309 case EXEC_OMP_PARALLEL_DO:
8310 case EXEC_OMP_PARALLEL_SECTIONS:
8312 omp_workshare_save = omp_workshare_flag;
8313 omp_workshare_flag = 0;
8314 gfc_resolve_omp_parallel_blocks (code, ns);
8317 gfc_resolve_omp_do_blocks (code, ns);
8319 case EXEC_SELECT_TYPE:
8320 gfc_current_ns = code->ext.block.ns;
8321 gfc_resolve_blocks (code->block, gfc_current_ns);
8322 gfc_current_ns = ns;
8324 case EXEC_OMP_WORKSHARE:
8325 omp_workshare_save = omp_workshare_flag;
8326 omp_workshare_flag = 1;
8329 gfc_resolve_blocks (code->block, ns);
8333 if (omp_workshare_save != -1)
8334 omp_workshare_flag = omp_workshare_save;
8338 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8339 t = gfc_resolve_expr (code->expr1);
8340 forall_flag = forall_save;
8342 if (gfc_resolve_expr (code->expr2) == FAILURE)
8345 if (code->op == EXEC_ALLOCATE
8346 && gfc_resolve_expr (code->expr3) == FAILURE)
8352 case EXEC_END_BLOCK:
8356 case EXEC_ERROR_STOP:
8360 case EXEC_ASSIGN_CALL:
8365 case EXEC_SYNC_IMAGES:
8366 case EXEC_SYNC_MEMORY:
8367 resolve_sync (code);
8371 /* Keep track of which entry we are up to. */
8372 current_entry_id = code->ext.entry->id;
8376 resolve_where (code, NULL);
8380 if (code->expr1 != NULL)
8382 if (code->expr1->ts.type != BT_INTEGER)
8383 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8384 "INTEGER variable", &code->expr1->where);
8385 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8386 gfc_error ("Variable '%s' has not been assigned a target "
8387 "label at %L", code->expr1->symtree->n.sym->name,
8388 &code->expr1->where);
8391 resolve_branch (code->label1, code);
8395 if (code->expr1 != NULL
8396 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8397 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8398 "INTEGER return specifier", &code->expr1->where);
8401 case EXEC_INIT_ASSIGN:
8402 case EXEC_END_PROCEDURE:
8409 if (resolve_ordinary_assign (code, ns))
8411 if (code->op == EXEC_COMPCALL)
8418 case EXEC_LABEL_ASSIGN:
8419 if (code->label1->defined == ST_LABEL_UNKNOWN)
8420 gfc_error ("Label %d referenced at %L is never defined",
8421 code->label1->value, &code->label1->where);
8423 && (code->expr1->expr_type != EXPR_VARIABLE
8424 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8425 || code->expr1->symtree->n.sym->ts.kind
8426 != gfc_default_integer_kind
8427 || code->expr1->symtree->n.sym->as != NULL))
8428 gfc_error ("ASSIGN statement at %L requires a scalar "
8429 "default INTEGER variable", &code->expr1->where);
8432 case EXEC_POINTER_ASSIGN:
8436 gfc_check_pointer_assign (code->expr1, code->expr2);
8439 case EXEC_ARITHMETIC_IF:
8441 && code->expr1->ts.type != BT_INTEGER
8442 && code->expr1->ts.type != BT_REAL)
8443 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8444 "expression", &code->expr1->where);
8446 resolve_branch (code->label1, code);
8447 resolve_branch (code->label2, code);
8448 resolve_branch (code->label3, code);
8452 if (t == SUCCESS && code->expr1 != NULL
8453 && (code->expr1->ts.type != BT_LOGICAL
8454 || code->expr1->rank != 0))
8455 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8456 &code->expr1->where);
8461 resolve_call (code);
8466 resolve_typebound_subroutine (code);
8470 resolve_ppc_call (code);
8474 /* Select is complicated. Also, a SELECT construct could be
8475 a transformed computed GOTO. */
8476 resolve_select (code);
8479 case EXEC_SELECT_TYPE:
8480 resolve_select_type (code);
8484 gfc_resolve (code->ext.block.ns);
8488 if (code->ext.iterator != NULL)
8490 gfc_iterator *iter = code->ext.iterator;
8491 if (gfc_resolve_iterator (iter, true) != FAILURE)
8492 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8497 if (code->expr1 == NULL)
8498 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8500 && (code->expr1->rank != 0
8501 || code->expr1->ts.type != BT_LOGICAL))
8502 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8503 "a scalar LOGICAL expression", &code->expr1->where);
8508 resolve_allocate_deallocate (code, "ALLOCATE");
8512 case EXEC_DEALLOCATE:
8514 resolve_allocate_deallocate (code, "DEALLOCATE");
8519 if (gfc_resolve_open (code->ext.open) == FAILURE)
8522 resolve_branch (code->ext.open->err, code);
8526 if (gfc_resolve_close (code->ext.close) == FAILURE)
8529 resolve_branch (code->ext.close->err, code);
8532 case EXEC_BACKSPACE:
8536 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8539 resolve_branch (code->ext.filepos->err, code);
8543 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8546 resolve_branch (code->ext.inquire->err, code);
8550 gcc_assert (code->ext.inquire != NULL);
8551 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8554 resolve_branch (code->ext.inquire->err, code);
8558 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8561 resolve_branch (code->ext.wait->err, code);
8562 resolve_branch (code->ext.wait->end, code);
8563 resolve_branch (code->ext.wait->eor, code);
8568 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8571 resolve_branch (code->ext.dt->err, code);
8572 resolve_branch (code->ext.dt->end, code);
8573 resolve_branch (code->ext.dt->eor, code);
8577 resolve_transfer (code);
8581 resolve_forall_iterators (code->ext.forall_iterator);
8583 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8584 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8585 "expression", &code->expr1->where);
8588 case EXEC_OMP_ATOMIC:
8589 case EXEC_OMP_BARRIER:
8590 case EXEC_OMP_CRITICAL:
8591 case EXEC_OMP_FLUSH:
8593 case EXEC_OMP_MASTER:
8594 case EXEC_OMP_ORDERED:
8595 case EXEC_OMP_SECTIONS:
8596 case EXEC_OMP_SINGLE:
8597 case EXEC_OMP_TASKWAIT:
8598 case EXEC_OMP_WORKSHARE:
8599 gfc_resolve_omp_directive (code, ns);
8602 case EXEC_OMP_PARALLEL:
8603 case EXEC_OMP_PARALLEL_DO:
8604 case EXEC_OMP_PARALLEL_SECTIONS:
8605 case EXEC_OMP_PARALLEL_WORKSHARE:
8607 omp_workshare_save = omp_workshare_flag;
8608 omp_workshare_flag = 0;
8609 gfc_resolve_omp_directive (code, ns);
8610 omp_workshare_flag = omp_workshare_save;
8614 gfc_internal_error ("resolve_code(): Bad statement code");
8618 cs_base = frame.prev;
8622 /* Resolve initial values and make sure they are compatible with
8626 resolve_values (gfc_symbol *sym)
8628 if (sym->value == NULL)
8631 if (gfc_resolve_expr (sym->value) == FAILURE)
8634 gfc_check_assign_symbol (sym, sym->value);
8638 /* Verify the binding labels for common blocks that are BIND(C). The label
8639 for a BIND(C) common block must be identical in all scoping units in which
8640 the common block is declared. Further, the binding label can not collide
8641 with any other global entity in the program. */
8644 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8646 if (comm_block_tree->n.common->is_bind_c == 1)
8648 gfc_gsymbol *binding_label_gsym;
8649 gfc_gsymbol *comm_name_gsym;
8651 /* See if a global symbol exists by the common block's name. It may
8652 be NULL if the common block is use-associated. */
8653 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8654 comm_block_tree->n.common->name);
8655 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8656 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8657 "with the global entity '%s' at %L",
8658 comm_block_tree->n.common->binding_label,
8659 comm_block_tree->n.common->name,
8660 &(comm_block_tree->n.common->where),
8661 comm_name_gsym->name, &(comm_name_gsym->where));
8662 else if (comm_name_gsym != NULL
8663 && strcmp (comm_name_gsym->name,
8664 comm_block_tree->n.common->name) == 0)
8666 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8668 if (comm_name_gsym->binding_label == NULL)
8669 /* No binding label for common block stored yet; save this one. */
8670 comm_name_gsym->binding_label =
8671 comm_block_tree->n.common->binding_label;
8673 if (strcmp (comm_name_gsym->binding_label,
8674 comm_block_tree->n.common->binding_label) != 0)
8676 /* Common block names match but binding labels do not. */
8677 gfc_error ("Binding label '%s' for common block '%s' at %L "
8678 "does not match the binding label '%s' for common "
8680 comm_block_tree->n.common->binding_label,
8681 comm_block_tree->n.common->name,
8682 &(comm_block_tree->n.common->where),
8683 comm_name_gsym->binding_label,
8684 comm_name_gsym->name,
8685 &(comm_name_gsym->where));
8690 /* There is no binding label (NAME="") so we have nothing further to
8691 check and nothing to add as a global symbol for the label. */
8692 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8695 binding_label_gsym =
8696 gfc_find_gsymbol (gfc_gsym_root,
8697 comm_block_tree->n.common->binding_label);
8698 if (binding_label_gsym == NULL)
8700 /* Need to make a global symbol for the binding label to prevent
8701 it from colliding with another. */
8702 binding_label_gsym =
8703 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8704 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8705 binding_label_gsym->type = GSYM_COMMON;
8709 /* If comm_name_gsym is NULL, the name common block is use
8710 associated and the name could be colliding. */
8711 if (binding_label_gsym->type != GSYM_COMMON)
8712 gfc_error ("Binding label '%s' for common block '%s' at %L "
8713 "collides with the global entity '%s' at %L",
8714 comm_block_tree->n.common->binding_label,
8715 comm_block_tree->n.common->name,
8716 &(comm_block_tree->n.common->where),
8717 binding_label_gsym->name,
8718 &(binding_label_gsym->where));
8719 else if (comm_name_gsym != NULL
8720 && (strcmp (binding_label_gsym->name,
8721 comm_name_gsym->binding_label) != 0)
8722 && (strcmp (binding_label_gsym->sym_name,
8723 comm_name_gsym->name) != 0))
8724 gfc_error ("Binding label '%s' for common block '%s' at %L "
8725 "collides with global entity '%s' at %L",
8726 binding_label_gsym->name, binding_label_gsym->sym_name,
8727 &(comm_block_tree->n.common->where),
8728 comm_name_gsym->name, &(comm_name_gsym->where));
8736 /* Verify any BIND(C) derived types in the namespace so we can report errors
8737 for them once, rather than for each variable declared of that type. */
8740 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8742 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8743 && derived_sym->attr.is_bind_c == 1)
8744 verify_bind_c_derived_type (derived_sym);
8750 /* Verify that any binding labels used in a given namespace do not collide
8751 with the names or binding labels of any global symbols. */
8754 gfc_verify_binding_labels (gfc_symbol *sym)
8758 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8759 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8761 gfc_gsymbol *bind_c_sym;
8763 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8764 if (bind_c_sym != NULL
8765 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8767 if (sym->attr.if_source == IFSRC_DECL
8768 && (bind_c_sym->type != GSYM_SUBROUTINE
8769 && bind_c_sym->type != GSYM_FUNCTION)
8770 && ((sym->attr.contained == 1
8771 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8772 || (sym->attr.use_assoc == 1
8773 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8775 /* Make sure global procedures don't collide with anything. */
8776 gfc_error ("Binding label '%s' at %L collides with the global "
8777 "entity '%s' at %L", sym->binding_label,
8778 &(sym->declared_at), bind_c_sym->name,
8779 &(bind_c_sym->where));
8782 else if (sym->attr.contained == 0
8783 && (sym->attr.if_source == IFSRC_IFBODY
8784 && sym->attr.flavor == FL_PROCEDURE)
8785 && (bind_c_sym->sym_name != NULL
8786 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8788 /* Make sure procedures in interface bodies don't collide. */
8789 gfc_error ("Binding label '%s' in interface body at %L collides "
8790 "with the global entity '%s' at %L",
8792 &(sym->declared_at), bind_c_sym->name,
8793 &(bind_c_sym->where));
8796 else if (sym->attr.contained == 0
8797 && sym->attr.if_source == IFSRC_UNKNOWN)
8798 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8799 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8800 || sym->attr.use_assoc == 0)
8802 gfc_error ("Binding label '%s' at %L collides with global "
8803 "entity '%s' at %L", sym->binding_label,
8804 &(sym->declared_at), bind_c_sym->name,
8805 &(bind_c_sym->where));
8810 /* Clear the binding label to prevent checking multiple times. */
8811 sym->binding_label[0] = '\0';
8813 else if (bind_c_sym == NULL)
8815 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8816 bind_c_sym->where = sym->declared_at;
8817 bind_c_sym->sym_name = sym->name;
8819 if (sym->attr.use_assoc == 1)
8820 bind_c_sym->mod_name = sym->module;
8822 if (sym->ns->proc_name != NULL)
8823 bind_c_sym->mod_name = sym->ns->proc_name->name;
8825 if (sym->attr.contained == 0)
8827 if (sym->attr.subroutine)
8828 bind_c_sym->type = GSYM_SUBROUTINE;
8829 else if (sym->attr.function)
8830 bind_c_sym->type = GSYM_FUNCTION;
8838 /* Resolve an index expression. */
8841 resolve_index_expr (gfc_expr *e)
8843 if (gfc_resolve_expr (e) == FAILURE)
8846 if (gfc_simplify_expr (e, 0) == FAILURE)
8849 if (gfc_specification_expr (e) == FAILURE)
8855 /* Resolve a charlen structure. */
8858 resolve_charlen (gfc_charlen *cl)
8867 specification_expr = 1;
8869 if (resolve_index_expr (cl->length) == FAILURE)
8871 specification_expr = 0;
8875 /* "If the character length parameter value evaluates to a negative
8876 value, the length of character entities declared is zero." */
8877 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8879 if (gfc_option.warn_surprising)
8880 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8881 " the length has been set to zero",
8882 &cl->length->where, i);
8883 gfc_replace_expr (cl->length,
8884 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
8887 /* Check that the character length is not too large. */
8888 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8889 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8890 && cl->length->ts.type == BT_INTEGER
8891 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8893 gfc_error ("String length at %L is too large", &cl->length->where);
8901 /* Test for non-constant shape arrays. */
8904 is_non_constant_shape_array (gfc_symbol *sym)
8910 not_constant = false;
8911 if (sym->as != NULL)
8913 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
8914 has not been simplified; parameter array references. Do the
8915 simplification now. */
8916 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
8918 e = sym->as->lower[i];
8919 if (e && (resolve_index_expr (e) == FAILURE
8920 || !gfc_is_constant_expr (e)))
8921 not_constant = true;
8922 e = sym->as->upper[i];
8923 if (e && (resolve_index_expr (e) == FAILURE
8924 || !gfc_is_constant_expr (e)))
8925 not_constant = true;
8928 return not_constant;
8931 /* Given a symbol and an initialization expression, add code to initialize
8932 the symbol to the function entry. */
8934 build_init_assign (gfc_symbol *sym, gfc_expr *init)
8938 gfc_namespace *ns = sym->ns;
8940 /* Search for the function namespace if this is a contained
8941 function without an explicit result. */
8942 if (sym->attr.function && sym == sym->result
8943 && sym->name != sym->ns->proc_name->name)
8946 for (;ns; ns = ns->sibling)
8947 if (strcmp (ns->proc_name->name, sym->name) == 0)
8953 gfc_free_expr (init);
8957 /* Build an l-value expression for the result. */
8958 lval = gfc_lval_expr_from_sym (sym);
8960 /* Add the code at scope entry. */
8961 init_st = gfc_get_code ();
8962 init_st->next = ns->code;
8965 /* Assign the default initializer to the l-value. */
8966 init_st->loc = sym->declared_at;
8967 init_st->op = EXEC_INIT_ASSIGN;
8968 init_st->expr1 = lval;
8969 init_st->expr2 = init;
8972 /* Assign the default initializer to a derived type variable or result. */
8975 apply_default_init (gfc_symbol *sym)
8977 gfc_expr *init = NULL;
8979 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
8982 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
8983 init = gfc_default_initializer (&sym->ts);
8988 build_init_assign (sym, init);
8991 /* Build an initializer for a local integer, real, complex, logical, or
8992 character variable, based on the command line flags finit-local-zero,
8993 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
8994 null if the symbol should not have a default initialization. */
8996 build_default_init_expr (gfc_symbol *sym)
8999 gfc_expr *init_expr;
9002 /* These symbols should never have a default initialization. */
9003 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9004 || sym->attr.external
9006 || sym->attr.pointer
9007 || sym->attr.in_equivalence
9008 || sym->attr.in_common
9011 || sym->attr.cray_pointee
9012 || sym->attr.cray_pointer)
9015 /* Now we'll try to build an initializer expression. */
9016 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9019 /* We will only initialize integers, reals, complex, logicals, and
9020 characters, and only if the corresponding command-line flags
9021 were set. Otherwise, we free init_expr and return null. */
9022 switch (sym->ts.type)
9025 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9026 mpz_init_set_si (init_expr->value.integer,
9027 gfc_option.flag_init_integer_value);
9030 gfc_free_expr (init_expr);
9036 mpfr_init (init_expr->value.real);
9037 switch (gfc_option.flag_init_real)
9039 case GFC_INIT_REAL_SNAN:
9040 init_expr->is_snan = 1;
9042 case GFC_INIT_REAL_NAN:
9043 mpfr_set_nan (init_expr->value.real);
9046 case GFC_INIT_REAL_INF:
9047 mpfr_set_inf (init_expr->value.real, 1);
9050 case GFC_INIT_REAL_NEG_INF:
9051 mpfr_set_inf (init_expr->value.real, -1);
9054 case GFC_INIT_REAL_ZERO:
9055 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9059 gfc_free_expr (init_expr);
9066 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
9067 switch (gfc_option.flag_init_real)
9069 case GFC_INIT_REAL_SNAN:
9070 init_expr->is_snan = 1;
9072 case GFC_INIT_REAL_NAN:
9073 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9074 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9077 case GFC_INIT_REAL_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_NEG_INF:
9083 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9084 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9087 case GFC_INIT_REAL_ZERO:
9088 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9092 gfc_free_expr (init_expr);
9099 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9100 init_expr->value.logical = 0;
9101 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9102 init_expr->value.logical = 1;
9105 gfc_free_expr (init_expr);
9111 /* For characters, the length must be constant in order to
9112 create a default initializer. */
9113 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9114 && sym->ts.u.cl->length
9115 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9117 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9118 init_expr->value.character.length = char_len;
9119 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9120 for (i = 0; i < char_len; i++)
9121 init_expr->value.character.string[i]
9122 = (unsigned char) gfc_option.flag_init_character_value;
9126 gfc_free_expr (init_expr);
9132 gfc_free_expr (init_expr);
9138 /* Add an initialization expression to a local variable. */
9140 apply_default_init_local (gfc_symbol *sym)
9142 gfc_expr *init = NULL;
9144 /* The symbol should be a variable or a function return value. */
9145 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9146 || (sym->attr.function && sym->result != sym))
9149 /* Try to build the initializer expression. If we can't initialize
9150 this symbol, then init will be NULL. */
9151 init = build_default_init_expr (sym);
9155 /* For saved variables, we don't want to add an initializer at
9156 function entry, so we just add a static initializer. */
9157 if (sym->attr.save || sym->ns->save_all
9158 || gfc_option.flag_max_stack_var_size == 0)
9160 /* Don't clobber an existing initializer! */
9161 gcc_assert (sym->value == NULL);
9166 build_init_assign (sym, init);
9169 /* Resolution of common features of flavors variable and procedure. */
9172 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9174 /* Constraints on deferred shape variable. */
9175 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9177 if (sym->attr.allocatable)
9179 if (sym->attr.dimension)
9181 gfc_error ("Allocatable array '%s' at %L must have "
9182 "a deferred shape", sym->name, &sym->declared_at);
9185 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9186 "may not be ALLOCATABLE", sym->name,
9187 &sym->declared_at) == FAILURE)
9191 if (sym->attr.pointer && sym->attr.dimension)
9193 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9194 sym->name, &sym->declared_at);
9201 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9202 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9204 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9205 sym->name, &sym->declared_at);
9210 /* Constraints on polymorphic variables. */
9211 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9214 if (!gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9216 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9217 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9223 /* Assume that use associated symbols were checked in the module ns. */
9224 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9226 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9227 "or pointer", sym->name, &sym->declared_at);
9236 /* Additional checks for symbols with flavor variable and derived
9237 type. To be called from resolve_fl_variable. */
9240 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9242 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9244 /* Check to see if a derived type is blocked from being host
9245 associated by the presence of another class I symbol in the same
9246 namespace. 14.6.1.3 of the standard and the discussion on
9247 comp.lang.fortran. */
9248 if (sym->ns != sym->ts.u.derived->ns
9249 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9252 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9253 if (s && s->attr.flavor != FL_DERIVED)
9255 gfc_error ("The type '%s' cannot be host associated at %L "
9256 "because it is blocked by an incompatible object "
9257 "of the same name declared at %L",
9258 sym->ts.u.derived->name, &sym->declared_at,
9264 /* 4th constraint in section 11.3: "If an object of a type for which
9265 component-initialization is specified (R429) appears in the
9266 specification-part of a module and does not have the ALLOCATABLE
9267 or POINTER attribute, the object shall have the SAVE attribute."
9269 The check for initializers is performed with
9270 gfc_has_default_initializer because gfc_default_initializer generates
9271 a hidden default for allocatable components. */
9272 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9273 && sym->ns->proc_name->attr.flavor == FL_MODULE
9274 && !sym->ns->save_all && !sym->attr.save
9275 && !sym->attr.pointer && !sym->attr.allocatable
9276 && gfc_has_default_initializer (sym->ts.u.derived)
9277 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9278 "module variable '%s' at %L, needed due to "
9279 "the default initialization", sym->name,
9280 &sym->declared_at) == FAILURE)
9283 /* Assign default initializer. */
9284 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9285 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9287 sym->value = gfc_default_initializer (&sym->ts);
9294 /* Resolve symbols with flavor variable. */
9297 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9299 int no_init_flag, automatic_flag;
9301 const char *auto_save_msg;
9303 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9306 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9309 /* Set this flag to check that variables are parameters of all entries.
9310 This check is effected by the call to gfc_resolve_expr through
9311 is_non_constant_shape_array. */
9312 specification_expr = 1;
9314 if (sym->ns->proc_name
9315 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9316 || sym->ns->proc_name->attr.is_main_program)
9317 && !sym->attr.use_assoc
9318 && !sym->attr.allocatable
9319 && !sym->attr.pointer
9320 && is_non_constant_shape_array (sym))
9322 /* The shape of a main program or module array needs to be
9324 gfc_error ("The module or main program array '%s' at %L must "
9325 "have constant shape", sym->name, &sym->declared_at);
9326 specification_expr = 0;
9330 if (sym->ts.type == BT_CHARACTER)
9332 /* Make sure that character string variables with assumed length are
9334 e = sym->ts.u.cl->length;
9335 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9337 gfc_error ("Entity with assumed character length at %L must be a "
9338 "dummy argument or a PARAMETER", &sym->declared_at);
9342 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9344 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9348 if (!gfc_is_constant_expr (e)
9349 && !(e->expr_type == EXPR_VARIABLE
9350 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9351 && sym->ns->proc_name
9352 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9353 || sym->ns->proc_name->attr.is_main_program)
9354 && !sym->attr.use_assoc)
9356 gfc_error ("'%s' at %L must have constant character length "
9357 "in this context", sym->name, &sym->declared_at);
9362 if (sym->value == NULL && sym->attr.referenced)
9363 apply_default_init_local (sym); /* Try to apply a default initialization. */
9365 /* Determine if the symbol may not have an initializer. */
9366 no_init_flag = automatic_flag = 0;
9367 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9368 || sym->attr.intrinsic || sym->attr.result)
9370 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9371 && is_non_constant_shape_array (sym))
9373 no_init_flag = automatic_flag = 1;
9375 /* Also, they must not have the SAVE attribute.
9376 SAVE_IMPLICIT is checked below. */
9377 if (sym->attr.save == SAVE_EXPLICIT)
9379 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9384 /* Ensure that any initializer is simplified. */
9386 gfc_simplify_expr (sym->value, 1);
9388 /* Reject illegal initializers. */
9389 if (!sym->mark && sym->value)
9391 if (sym->attr.allocatable)
9392 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9393 sym->name, &sym->declared_at);
9394 else if (sym->attr.external)
9395 gfc_error ("External '%s' at %L cannot have an initializer",
9396 sym->name, &sym->declared_at);
9397 else if (sym->attr.dummy
9398 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9399 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9400 sym->name, &sym->declared_at);
9401 else if (sym->attr.intrinsic)
9402 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9403 sym->name, &sym->declared_at);
9404 else if (sym->attr.result)
9405 gfc_error ("Function result '%s' at %L cannot have an initializer",
9406 sym->name, &sym->declared_at);
9407 else if (automatic_flag)
9408 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9409 sym->name, &sym->declared_at);
9416 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9417 return resolve_fl_variable_derived (sym, no_init_flag);
9423 /* Resolve a procedure. */
9426 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9428 gfc_formal_arglist *arg;
9430 if (sym->attr.function
9431 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9434 if (sym->ts.type == BT_CHARACTER)
9436 gfc_charlen *cl = sym->ts.u.cl;
9438 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9439 && resolve_charlen (cl) == FAILURE)
9442 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9443 && sym->attr.proc == PROC_ST_FUNCTION)
9445 gfc_error ("Character-valued statement function '%s' at %L must "
9446 "have constant length", sym->name, &sym->declared_at);
9451 /* Ensure that derived type for are not of a private type. Internal
9452 module procedures are excluded by 2.2.3.3 - i.e., they are not
9453 externally accessible and can access all the objects accessible in
9455 if (!(sym->ns->parent
9456 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9457 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9459 gfc_interface *iface;
9461 for (arg = sym->formal; arg; arg = arg->next)
9464 && arg->sym->ts.type == BT_DERIVED
9465 && !arg->sym->ts.u.derived->attr.use_assoc
9466 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9467 arg->sym->ts.u.derived->ns->default_access)
9468 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9469 "PRIVATE type and cannot be a dummy argument"
9470 " of '%s', which is PUBLIC at %L",
9471 arg->sym->name, sym->name, &sym->declared_at)
9474 /* Stop this message from recurring. */
9475 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9480 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9481 PRIVATE to the containing module. */
9482 for (iface = sym->generic; iface; iface = iface->next)
9484 for (arg = iface->sym->formal; arg; arg = arg->next)
9487 && arg->sym->ts.type == BT_DERIVED
9488 && !arg->sym->ts.u.derived->attr.use_assoc
9489 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9490 arg->sym->ts.u.derived->ns->default_access)
9491 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9492 "'%s' in PUBLIC interface '%s' at %L "
9493 "takes dummy arguments of '%s' which is "
9494 "PRIVATE", iface->sym->name, sym->name,
9495 &iface->sym->declared_at,
9496 gfc_typename (&arg->sym->ts)) == FAILURE)
9498 /* Stop this message from recurring. */
9499 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9505 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9506 PRIVATE to the containing module. */
9507 for (iface = sym->generic; iface; iface = iface->next)
9509 for (arg = iface->sym->formal; arg; arg = arg->next)
9512 && arg->sym->ts.type == BT_DERIVED
9513 && !arg->sym->ts.u.derived->attr.use_assoc
9514 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9515 arg->sym->ts.u.derived->ns->default_access)
9516 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9517 "'%s' in PUBLIC interface '%s' at %L "
9518 "takes dummy arguments of '%s' which is "
9519 "PRIVATE", iface->sym->name, sym->name,
9520 &iface->sym->declared_at,
9521 gfc_typename (&arg->sym->ts)) == FAILURE)
9523 /* Stop this message from recurring. */
9524 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9531 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9532 && !sym->attr.proc_pointer)
9534 gfc_error ("Function '%s' at %L cannot have an initializer",
9535 sym->name, &sym->declared_at);
9539 /* An external symbol may not have an initializer because it is taken to be
9540 a procedure. Exception: Procedure Pointers. */
9541 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9543 gfc_error ("External object '%s' at %L may not have an initializer",
9544 sym->name, &sym->declared_at);
9548 /* An elemental function is required to return a scalar 12.7.1 */
9549 if (sym->attr.elemental && sym->attr.function && sym->as)
9551 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9552 "result", sym->name, &sym->declared_at);
9553 /* Reset so that the error only occurs once. */
9554 sym->attr.elemental = 0;
9558 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9559 char-len-param shall not be array-valued, pointer-valued, recursive
9560 or pure. ....snip... A character value of * may only be used in the
9561 following ways: (i) Dummy arg of procedure - dummy associates with
9562 actual length; (ii) To declare a named constant; or (iii) External
9563 function - but length must be declared in calling scoping unit. */
9564 if (sym->attr.function
9565 && sym->ts.type == BT_CHARACTER
9566 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9568 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9569 || (sym->attr.recursive) || (sym->attr.pure))
9571 if (sym->as && sym->as->rank)
9572 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9573 "array-valued", sym->name, &sym->declared_at);
9575 if (sym->attr.pointer)
9576 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9577 "pointer-valued", sym->name, &sym->declared_at);
9580 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9581 "pure", sym->name, &sym->declared_at);
9583 if (sym->attr.recursive)
9584 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9585 "recursive", sym->name, &sym->declared_at);
9590 /* Appendix B.2 of the standard. Contained functions give an
9591 error anyway. Fixed-form is likely to be F77/legacy. */
9592 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9593 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9594 "CHARACTER(*) function '%s' at %L",
9595 sym->name, &sym->declared_at);
9598 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9600 gfc_formal_arglist *curr_arg;
9601 int has_non_interop_arg = 0;
9603 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9604 sym->common_block) == FAILURE)
9606 /* Clear these to prevent looking at them again if there was an
9608 sym->attr.is_bind_c = 0;
9609 sym->attr.is_c_interop = 0;
9610 sym->ts.is_c_interop = 0;
9614 /* So far, no errors have been found. */
9615 sym->attr.is_c_interop = 1;
9616 sym->ts.is_c_interop = 1;
9619 curr_arg = sym->formal;
9620 while (curr_arg != NULL)
9622 /* Skip implicitly typed dummy args here. */
9623 if (curr_arg->sym->attr.implicit_type == 0)
9624 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9625 /* If something is found to fail, record the fact so we
9626 can mark the symbol for the procedure as not being
9627 BIND(C) to try and prevent multiple errors being
9629 has_non_interop_arg = 1;
9631 curr_arg = curr_arg->next;
9634 /* See if any of the arguments were not interoperable and if so, clear
9635 the procedure symbol to prevent duplicate error messages. */
9636 if (has_non_interop_arg != 0)
9638 sym->attr.is_c_interop = 0;
9639 sym->ts.is_c_interop = 0;
9640 sym->attr.is_bind_c = 0;
9644 if (!sym->attr.proc_pointer)
9646 if (sym->attr.save == SAVE_EXPLICIT)
9648 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9649 "in '%s' at %L", sym->name, &sym->declared_at);
9652 if (sym->attr.intent)
9654 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9655 "in '%s' at %L", sym->name, &sym->declared_at);
9658 if (sym->attr.subroutine && sym->attr.result)
9660 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9661 "in '%s' at %L", sym->name, &sym->declared_at);
9664 if (sym->attr.external && sym->attr.function
9665 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9666 || sym->attr.contained))
9668 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9669 "in '%s' at %L", sym->name, &sym->declared_at);
9672 if (strcmp ("ppr@", sym->name) == 0)
9674 gfc_error ("Procedure pointer result '%s' at %L "
9675 "is missing the pointer attribute",
9676 sym->ns->proc_name->name, &sym->declared_at);
9685 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9686 been defined and we now know their defined arguments, check that they fulfill
9687 the requirements of the standard for procedures used as finalizers. */
9690 gfc_resolve_finalizers (gfc_symbol* derived)
9692 gfc_finalizer* list;
9693 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9694 gfc_try result = SUCCESS;
9695 bool seen_scalar = false;
9697 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9700 /* Walk over the list of finalizer-procedures, check them, and if any one
9701 does not fit in with the standard's definition, print an error and remove
9702 it from the list. */
9703 prev_link = &derived->f2k_derived->finalizers;
9704 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9710 /* Skip this finalizer if we already resolved it. */
9711 if (list->proc_tree)
9713 prev_link = &(list->next);
9717 /* Check this exists and is a SUBROUTINE. */
9718 if (!list->proc_sym->attr.subroutine)
9720 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9721 list->proc_sym->name, &list->where);
9725 /* We should have exactly one argument. */
9726 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9728 gfc_error ("FINAL procedure at %L must have exactly one argument",
9732 arg = list->proc_sym->formal->sym;
9734 /* This argument must be of our type. */
9735 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9737 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9738 &arg->declared_at, derived->name);
9742 /* It must neither be a pointer nor allocatable nor optional. */
9743 if (arg->attr.pointer)
9745 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9749 if (arg->attr.allocatable)
9751 gfc_error ("Argument of FINAL procedure at %L must not be"
9752 " ALLOCATABLE", &arg->declared_at);
9755 if (arg->attr.optional)
9757 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9762 /* It must not be INTENT(OUT). */
9763 if (arg->attr.intent == INTENT_OUT)
9765 gfc_error ("Argument of FINAL procedure at %L must not be"
9766 " INTENT(OUT)", &arg->declared_at);
9770 /* Warn if the procedure is non-scalar and not assumed shape. */
9771 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9772 && arg->as->type != AS_ASSUMED_SHAPE)
9773 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9774 " shape argument", &arg->declared_at);
9776 /* Check that it does not match in kind and rank with a FINAL procedure
9777 defined earlier. To really loop over the *earlier* declarations,
9778 we need to walk the tail of the list as new ones were pushed at the
9780 /* TODO: Handle kind parameters once they are implemented. */
9781 my_rank = (arg->as ? arg->as->rank : 0);
9782 for (i = list->next; i; i = i->next)
9784 /* Argument list might be empty; that is an error signalled earlier,
9785 but we nevertheless continued resolving. */
9786 if (i->proc_sym->formal)
9788 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9789 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9790 if (i_rank == my_rank)
9792 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9793 " rank (%d) as '%s'",
9794 list->proc_sym->name, &list->where, my_rank,
9801 /* Is this the/a scalar finalizer procedure? */
9802 if (!arg->as || arg->as->rank == 0)
9805 /* Find the symtree for this procedure. */
9806 gcc_assert (!list->proc_tree);
9807 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9809 prev_link = &list->next;
9812 /* Remove wrong nodes immediately from the list so we don't risk any
9813 troubles in the future when they might fail later expectations. */
9817 *prev_link = list->next;
9818 gfc_free_finalizer (i);
9821 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9822 were nodes in the list, must have been for arrays. It is surely a good
9823 idea to have a scalar version there if there's something to finalize. */
9824 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9825 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9826 " defined at %L, suggest also scalar one",
9827 derived->name, &derived->declared_at);
9829 /* TODO: Remove this error when finalization is finished. */
9830 gfc_error ("Finalization at %L is not yet implemented",
9831 &derived->declared_at);
9837 /* Check that it is ok for the typebound procedure proc to override the
9841 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9844 const gfc_symbol* proc_target;
9845 const gfc_symbol* old_target;
9846 unsigned proc_pass_arg, old_pass_arg, argpos;
9847 gfc_formal_arglist* proc_formal;
9848 gfc_formal_arglist* old_formal;
9850 /* This procedure should only be called for non-GENERIC proc. */
9851 gcc_assert (!proc->n.tb->is_generic);
9853 /* If the overwritten procedure is GENERIC, this is an error. */
9854 if (old->n.tb->is_generic)
9856 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9857 old->name, &proc->n.tb->where);
9861 where = proc->n.tb->where;
9862 proc_target = proc->n.tb->u.specific->n.sym;
9863 old_target = old->n.tb->u.specific->n.sym;
9865 /* Check that overridden binding is not NON_OVERRIDABLE. */
9866 if (old->n.tb->non_overridable)
9868 gfc_error ("'%s' at %L overrides a procedure binding declared"
9869 " NON_OVERRIDABLE", proc->name, &where);
9873 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9874 if (!old->n.tb->deferred && proc->n.tb->deferred)
9876 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9877 " non-DEFERRED binding", proc->name, &where);
9881 /* If the overridden binding is PURE, the overriding must be, too. */
9882 if (old_target->attr.pure && !proc_target->attr.pure)
9884 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9885 proc->name, &where);
9889 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9890 is not, the overriding must not be either. */
9891 if (old_target->attr.elemental && !proc_target->attr.elemental)
9893 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
9894 " ELEMENTAL", proc->name, &where);
9897 if (!old_target->attr.elemental && proc_target->attr.elemental)
9899 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
9900 " be ELEMENTAL, either", proc->name, &where);
9904 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
9906 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
9908 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
9909 " SUBROUTINE", proc->name, &where);
9913 /* If the overridden binding is a FUNCTION, the overriding must also be a
9914 FUNCTION and have the same characteristics. */
9915 if (old_target->attr.function)
9917 if (!proc_target->attr.function)
9919 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
9920 " FUNCTION", proc->name, &where);
9924 /* FIXME: Do more comprehensive checking (including, for instance, the
9925 rank and array-shape). */
9926 gcc_assert (proc_target->result && old_target->result);
9927 if (!gfc_compare_types (&proc_target->result->ts,
9928 &old_target->result->ts))
9930 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
9931 " matching result types", proc->name, &where);
9936 /* If the overridden binding is PUBLIC, the overriding one must not be
9938 if (old->n.tb->access == ACCESS_PUBLIC
9939 && proc->n.tb->access == ACCESS_PRIVATE)
9941 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
9942 " PRIVATE", proc->name, &where);
9946 /* Compare the formal argument lists of both procedures. This is also abused
9947 to find the position of the passed-object dummy arguments of both
9948 bindings as at least the overridden one might not yet be resolved and we
9949 need those positions in the check below. */
9950 proc_pass_arg = old_pass_arg = 0;
9951 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
9953 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
9956 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
9957 proc_formal && old_formal;
9958 proc_formal = proc_formal->next, old_formal = old_formal->next)
9960 if (proc->n.tb->pass_arg
9961 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
9962 proc_pass_arg = argpos;
9963 if (old->n.tb->pass_arg
9964 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
9965 old_pass_arg = argpos;
9967 /* Check that the names correspond. */
9968 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
9970 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
9971 " to match the corresponding argument of the overridden"
9972 " procedure", proc_formal->sym->name, proc->name, &where,
9973 old_formal->sym->name);
9977 /* Check that the types correspond if neither is the passed-object
9979 /* FIXME: Do more comprehensive testing here. */
9980 if (proc_pass_arg != argpos && old_pass_arg != argpos
9981 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
9983 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
9984 "in respect to the overridden procedure",
9985 proc_formal->sym->name, proc->name, &where);
9991 if (proc_formal || old_formal)
9993 gfc_error ("'%s' at %L must have the same number of formal arguments as"
9994 " the overridden procedure", proc->name, &where);
9998 /* If the overridden binding is NOPASS, the overriding one must also be
10000 if (old->n.tb->nopass && !proc->n.tb->nopass)
10002 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10003 " NOPASS", proc->name, &where);
10007 /* If the overridden binding is PASS(x), the overriding one must also be
10008 PASS and the passed-object dummy arguments must correspond. */
10009 if (!old->n.tb->nopass)
10011 if (proc->n.tb->nopass)
10013 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10014 " PASS", proc->name, &where);
10018 if (proc_pass_arg != old_pass_arg)
10020 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10021 " the same position as the passed-object dummy argument of"
10022 " the overridden procedure", proc->name, &where);
10031 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10034 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10035 const char* generic_name, locus where)
10040 gcc_assert (t1->specific && t2->specific);
10041 gcc_assert (!t1->specific->is_generic);
10042 gcc_assert (!t2->specific->is_generic);
10044 sym1 = t1->specific->u.specific->n.sym;
10045 sym2 = t2->specific->u.specific->n.sym;
10050 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10051 if (sym1->attr.subroutine != sym2->attr.subroutine
10052 || sym1->attr.function != sym2->attr.function)
10054 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10055 " GENERIC '%s' at %L",
10056 sym1->name, sym2->name, generic_name, &where);
10060 /* Compare the interfaces. */
10061 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10063 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10064 sym1->name, sym2->name, generic_name, &where);
10072 /* Worker function for resolving a generic procedure binding; this is used to
10073 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10075 The difference between those cases is finding possible inherited bindings
10076 that are overridden, as one has to look for them in tb_sym_root,
10077 tb_uop_root or tb_op, respectively. Thus the caller must already find
10078 the super-type and set p->overridden correctly. */
10081 resolve_tb_generic_targets (gfc_symbol* super_type,
10082 gfc_typebound_proc* p, const char* name)
10084 gfc_tbp_generic* target;
10085 gfc_symtree* first_target;
10086 gfc_symtree* inherited;
10088 gcc_assert (p && p->is_generic);
10090 /* Try to find the specific bindings for the symtrees in our target-list. */
10091 gcc_assert (p->u.generic);
10092 for (target = p->u.generic; target; target = target->next)
10093 if (!target->specific)
10095 gfc_typebound_proc* overridden_tbp;
10096 gfc_tbp_generic* g;
10097 const char* target_name;
10099 target_name = target->specific_st->name;
10101 /* Defined for this type directly. */
10102 if (target->specific_st->n.tb)
10104 target->specific = target->specific_st->n.tb;
10105 goto specific_found;
10108 /* Look for an inherited specific binding. */
10111 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10116 gcc_assert (inherited->n.tb);
10117 target->specific = inherited->n.tb;
10118 goto specific_found;
10122 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10123 " at %L", target_name, name, &p->where);
10126 /* Once we've found the specific binding, check it is not ambiguous with
10127 other specifics already found or inherited for the same GENERIC. */
10129 gcc_assert (target->specific);
10131 /* This must really be a specific binding! */
10132 if (target->specific->is_generic)
10134 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10135 " '%s' is GENERIC, too", name, &p->where, target_name);
10139 /* Check those already resolved on this type directly. */
10140 for (g = p->u.generic; g; g = g->next)
10141 if (g != target && g->specific
10142 && check_generic_tbp_ambiguity (target, g, name, p->where)
10146 /* Check for ambiguity with inherited specific targets. */
10147 for (overridden_tbp = p->overridden; overridden_tbp;
10148 overridden_tbp = overridden_tbp->overridden)
10149 if (overridden_tbp->is_generic)
10151 for (g = overridden_tbp->u.generic; g; g = g->next)
10153 gcc_assert (g->specific);
10154 if (check_generic_tbp_ambiguity (target, g,
10155 name, p->where) == FAILURE)
10161 /* If we attempt to "overwrite" a specific binding, this is an error. */
10162 if (p->overridden && !p->overridden->is_generic)
10164 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10165 " the same name", name, &p->where);
10169 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10170 all must have the same attributes here. */
10171 first_target = p->u.generic->specific->u.specific;
10172 gcc_assert (first_target);
10173 p->subroutine = first_target->n.sym->attr.subroutine;
10174 p->function = first_target->n.sym->attr.function;
10180 /* Resolve a GENERIC procedure binding for a derived type. */
10183 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10185 gfc_symbol* super_type;
10187 /* Find the overridden binding if any. */
10188 st->n.tb->overridden = NULL;
10189 super_type = gfc_get_derived_super_type (derived);
10192 gfc_symtree* overridden;
10193 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10196 if (overridden && overridden->n.tb)
10197 st->n.tb->overridden = overridden->n.tb;
10200 /* Resolve using worker function. */
10201 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10205 /* Retrieve the target-procedure of an operator binding and do some checks in
10206 common for intrinsic and user-defined type-bound operators. */
10209 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10211 gfc_symbol* target_proc;
10213 gcc_assert (target->specific && !target->specific->is_generic);
10214 target_proc = target->specific->u.specific->n.sym;
10215 gcc_assert (target_proc);
10217 /* All operator bindings must have a passed-object dummy argument. */
10218 if (target->specific->nopass)
10220 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10224 return target_proc;
10228 /* Resolve a type-bound intrinsic operator. */
10231 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10232 gfc_typebound_proc* p)
10234 gfc_symbol* super_type;
10235 gfc_tbp_generic* target;
10237 /* If there's already an error here, do nothing (but don't fail again). */
10241 /* Operators should always be GENERIC bindings. */
10242 gcc_assert (p->is_generic);
10244 /* Look for an overridden binding. */
10245 super_type = gfc_get_derived_super_type (derived);
10246 if (super_type && super_type->f2k_derived)
10247 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10250 p->overridden = NULL;
10252 /* Resolve general GENERIC properties using worker function. */
10253 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10256 /* Check the targets to be procedures of correct interface. */
10257 for (target = p->u.generic; target; target = target->next)
10259 gfc_symbol* target_proc;
10261 target_proc = get_checked_tb_operator_target (target, p->where);
10265 if (!gfc_check_operator_interface (target_proc, op, p->where))
10277 /* Resolve a type-bound user operator (tree-walker callback). */
10279 static gfc_symbol* resolve_bindings_derived;
10280 static gfc_try resolve_bindings_result;
10282 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10285 resolve_typebound_user_op (gfc_symtree* stree)
10287 gfc_symbol* super_type;
10288 gfc_tbp_generic* target;
10290 gcc_assert (stree && stree->n.tb);
10292 if (stree->n.tb->error)
10295 /* Operators should always be GENERIC bindings. */
10296 gcc_assert (stree->n.tb->is_generic);
10298 /* Find overridden procedure, if any. */
10299 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10300 if (super_type && super_type->f2k_derived)
10302 gfc_symtree* overridden;
10303 overridden = gfc_find_typebound_user_op (super_type, NULL,
10304 stree->name, true, NULL);
10306 if (overridden && overridden->n.tb)
10307 stree->n.tb->overridden = overridden->n.tb;
10310 stree->n.tb->overridden = NULL;
10312 /* Resolve basically using worker function. */
10313 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10317 /* Check the targets to be functions of correct interface. */
10318 for (target = stree->n.tb->u.generic; target; target = target->next)
10320 gfc_symbol* target_proc;
10322 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10326 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10333 resolve_bindings_result = FAILURE;
10334 stree->n.tb->error = 1;
10338 /* Resolve the type-bound procedures for a derived type. */
10341 resolve_typebound_procedure (gfc_symtree* stree)
10345 gfc_symbol* me_arg;
10346 gfc_symbol* super_type;
10347 gfc_component* comp;
10349 gcc_assert (stree);
10351 /* Undefined specific symbol from GENERIC target definition. */
10355 if (stree->n.tb->error)
10358 /* If this is a GENERIC binding, use that routine. */
10359 if (stree->n.tb->is_generic)
10361 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10367 /* Get the target-procedure to check it. */
10368 gcc_assert (!stree->n.tb->is_generic);
10369 gcc_assert (stree->n.tb->u.specific);
10370 proc = stree->n.tb->u.specific->n.sym;
10371 where = stree->n.tb->where;
10373 /* Default access should already be resolved from the parser. */
10374 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10376 /* It should be a module procedure or an external procedure with explicit
10377 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10378 if ((!proc->attr.subroutine && !proc->attr.function)
10379 || (proc->attr.proc != PROC_MODULE
10380 && proc->attr.if_source != IFSRC_IFBODY)
10381 || (proc->attr.abstract && !stree->n.tb->deferred))
10383 gfc_error ("'%s' must be a module procedure or an external procedure with"
10384 " an explicit interface at %L", proc->name, &where);
10387 stree->n.tb->subroutine = proc->attr.subroutine;
10388 stree->n.tb->function = proc->attr.function;
10390 /* Find the super-type of the current derived type. We could do this once and
10391 store in a global if speed is needed, but as long as not I believe this is
10392 more readable and clearer. */
10393 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10395 /* If PASS, resolve and check arguments if not already resolved / loaded
10396 from a .mod file. */
10397 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10399 if (stree->n.tb->pass_arg)
10401 gfc_formal_arglist* i;
10403 /* If an explicit passing argument name is given, walk the arg-list
10404 and look for it. */
10407 stree->n.tb->pass_arg_num = 1;
10408 for (i = proc->formal; i; i = i->next)
10410 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10415 ++stree->n.tb->pass_arg_num;
10420 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10422 proc->name, stree->n.tb->pass_arg, &where,
10423 stree->n.tb->pass_arg);
10429 /* Otherwise, take the first one; there should in fact be at least
10431 stree->n.tb->pass_arg_num = 1;
10434 gfc_error ("Procedure '%s' with PASS at %L must have at"
10435 " least one argument", proc->name, &where);
10438 me_arg = proc->formal->sym;
10441 /* Now check that the argument-type matches and the passed-object
10442 dummy argument is generally fine. */
10444 gcc_assert (me_arg);
10446 if (me_arg->ts.type != BT_CLASS)
10448 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10449 " at %L", proc->name, &where);
10453 if (CLASS_DATA (me_arg)->ts.u.derived
10454 != resolve_bindings_derived)
10456 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10457 " the derived-type '%s'", me_arg->name, proc->name,
10458 me_arg->name, &where, resolve_bindings_derived->name);
10462 gcc_assert (me_arg->ts.type == BT_CLASS);
10463 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
10465 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10466 " scalar", proc->name, &where);
10469 if (CLASS_DATA (me_arg)->attr.allocatable)
10471 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10472 " be ALLOCATABLE", proc->name, &where);
10475 if (CLASS_DATA (me_arg)->attr.class_pointer)
10477 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10478 " be POINTER", proc->name, &where);
10483 /* If we are extending some type, check that we don't override a procedure
10484 flagged NON_OVERRIDABLE. */
10485 stree->n.tb->overridden = NULL;
10488 gfc_symtree* overridden;
10489 overridden = gfc_find_typebound_proc (super_type, NULL,
10490 stree->name, true, NULL);
10492 if (overridden && overridden->n.tb)
10493 stree->n.tb->overridden = overridden->n.tb;
10495 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10499 /* See if there's a name collision with a component directly in this type. */
10500 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10501 if (!strcmp (comp->name, stree->name))
10503 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10505 stree->name, &where, resolve_bindings_derived->name);
10509 /* Try to find a name collision with an inherited component. */
10510 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10512 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10513 " component of '%s'",
10514 stree->name, &where, resolve_bindings_derived->name);
10518 stree->n.tb->error = 0;
10522 resolve_bindings_result = FAILURE;
10523 stree->n.tb->error = 1;
10527 resolve_typebound_procedures (gfc_symbol* derived)
10531 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10534 resolve_bindings_derived = derived;
10535 resolve_bindings_result = SUCCESS;
10537 if (derived->f2k_derived->tb_sym_root)
10538 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10539 &resolve_typebound_procedure);
10541 if (derived->f2k_derived->tb_uop_root)
10542 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10543 &resolve_typebound_user_op);
10545 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10547 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10548 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10550 resolve_bindings_result = FAILURE;
10553 return resolve_bindings_result;
10557 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10558 to give all identical derived types the same backend_decl. */
10560 add_dt_to_dt_list (gfc_symbol *derived)
10562 gfc_dt_list *dt_list;
10564 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10565 if (derived == dt_list->derived)
10568 if (dt_list == NULL)
10570 dt_list = gfc_get_dt_list ();
10571 dt_list->next = gfc_derived_types;
10572 dt_list->derived = derived;
10573 gfc_derived_types = dt_list;
10578 /* Ensure that a derived-type is really not abstract, meaning that every
10579 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10582 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10587 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10589 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10592 if (st->n.tb && st->n.tb->deferred)
10594 gfc_symtree* overriding;
10595 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10598 gcc_assert (overriding->n.tb);
10599 if (overriding->n.tb->deferred)
10601 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10602 " '%s' is DEFERRED and not overridden",
10603 sub->name, &sub->declared_at, st->name);
10612 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10614 /* The algorithm used here is to recursively travel up the ancestry of sub
10615 and for each ancestor-type, check all bindings. If any of them is
10616 DEFERRED, look it up starting from sub and see if the found (overriding)
10617 binding is not DEFERRED.
10618 This is not the most efficient way to do this, but it should be ok and is
10619 clearer than something sophisticated. */
10621 gcc_assert (ancestor && !sub->attr.abstract);
10623 if (!ancestor->attr.abstract)
10626 /* Walk bindings of this ancestor. */
10627 if (ancestor->f2k_derived)
10630 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10635 /* Find next ancestor type and recurse on it. */
10636 ancestor = gfc_get_derived_super_type (ancestor);
10638 return ensure_not_abstract (sub, ancestor);
10644 static void resolve_symbol (gfc_symbol *sym);
10647 /* Resolve the components of a derived type. */
10650 resolve_fl_derived (gfc_symbol *sym)
10652 gfc_symbol* super_type;
10656 super_type = gfc_get_derived_super_type (sym);
10658 if (sym->attr.is_class && sym->ts.u.derived == NULL)
10660 /* Fix up incomplete CLASS symbols. */
10661 gfc_component *data = gfc_find_component (sym, "$data", true, true);
10662 gfc_component *vptr = gfc_find_component (sym, "$vptr", true, true);
10663 if (vptr->ts.u.derived == NULL)
10665 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived, false);
10667 vptr->ts.u.derived = vtab->ts.u.derived;
10672 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10674 gfc_error ("As extending type '%s' at %L has a coarray component, "
10675 "parent type '%s' shall also have one", sym->name,
10676 &sym->declared_at, super_type->name);
10680 /* Ensure the extended type gets resolved before we do. */
10681 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10684 /* An ABSTRACT type must be extensible. */
10685 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10687 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10688 sym->name, &sym->declared_at);
10692 for (c = sym->components; c != NULL; c = c->next)
10695 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10696 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10698 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10699 "deferred shape", c->name, &c->loc);
10704 if (c->attr.codimension && c->ts.type == BT_DERIVED
10705 && c->ts.u.derived->ts.is_iso_c)
10707 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10708 "shall not be a coarray", c->name, &c->loc);
10713 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10714 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10715 || c->attr.allocatable))
10717 gfc_error ("Component '%s' at %L with coarray component "
10718 "shall be a nonpointer, nonallocatable scalar",
10723 if (c->attr.proc_pointer && c->ts.interface)
10725 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
10726 gfc_error ("Interface '%s', used by procedure pointer component "
10727 "'%s' at %L, is declared in a later PROCEDURE statement",
10728 c->ts.interface->name, c->name, &c->loc);
10730 /* Get the attributes from the interface (now resolved). */
10731 if (c->ts.interface->attr.if_source
10732 || c->ts.interface->attr.intrinsic)
10734 gfc_symbol *ifc = c->ts.interface;
10736 if (ifc->formal && !ifc->formal_ns)
10737 resolve_symbol (ifc);
10739 if (ifc->attr.intrinsic)
10740 resolve_intrinsic (ifc, &ifc->declared_at);
10744 c->ts = ifc->result->ts;
10745 c->attr.allocatable = ifc->result->attr.allocatable;
10746 c->attr.pointer = ifc->result->attr.pointer;
10747 c->attr.dimension = ifc->result->attr.dimension;
10748 c->as = gfc_copy_array_spec (ifc->result->as);
10753 c->attr.allocatable = ifc->attr.allocatable;
10754 c->attr.pointer = ifc->attr.pointer;
10755 c->attr.dimension = ifc->attr.dimension;
10756 c->as = gfc_copy_array_spec (ifc->as);
10758 c->ts.interface = ifc;
10759 c->attr.function = ifc->attr.function;
10760 c->attr.subroutine = ifc->attr.subroutine;
10761 gfc_copy_formal_args_ppc (c, ifc);
10763 c->attr.pure = ifc->attr.pure;
10764 c->attr.elemental = ifc->attr.elemental;
10765 c->attr.recursive = ifc->attr.recursive;
10766 c->attr.always_explicit = ifc->attr.always_explicit;
10767 c->attr.ext_attr |= ifc->attr.ext_attr;
10768 /* Replace symbols in array spec. */
10772 for (i = 0; i < c->as->rank; i++)
10774 gfc_expr_replace_comp (c->as->lower[i], c);
10775 gfc_expr_replace_comp (c->as->upper[i], c);
10778 /* Copy char length. */
10779 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10781 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10782 gfc_expr_replace_comp (cl->length, c);
10783 if (cl->length && !cl->resolved
10784 && gfc_resolve_expr (cl->length) == FAILURE)
10789 else if (c->ts.interface->name[0] != '\0' && !sym->attr.vtype)
10791 gfc_error ("Interface '%s' of procedure pointer component "
10792 "'%s' at %L must be explicit", c->ts.interface->name,
10797 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10799 /* Since PPCs are not implicitly typed, a PPC without an explicit
10800 interface must be a subroutine. */
10801 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10804 /* Procedure pointer components: Check PASS arg. */
10805 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
10806 && !sym->attr.vtype)
10808 gfc_symbol* me_arg;
10810 if (c->tb->pass_arg)
10812 gfc_formal_arglist* i;
10814 /* If an explicit passing argument name is given, walk the arg-list
10815 and look for it. */
10818 c->tb->pass_arg_num = 1;
10819 for (i = c->formal; i; i = i->next)
10821 if (!strcmp (i->sym->name, c->tb->pass_arg))
10826 c->tb->pass_arg_num++;
10831 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10832 "at %L has no argument '%s'", c->name,
10833 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10840 /* Otherwise, take the first one; there should in fact be at least
10842 c->tb->pass_arg_num = 1;
10845 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10846 "must have at least one argument",
10851 me_arg = c->formal->sym;
10854 /* Now check that the argument-type matches. */
10855 gcc_assert (me_arg);
10856 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10857 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10858 || (me_arg->ts.type == BT_CLASS
10859 && CLASS_DATA (me_arg)->ts.u.derived != sym))
10861 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10862 " the derived type '%s'", me_arg->name, c->name,
10863 me_arg->name, &c->loc, sym->name);
10868 /* Check for C453. */
10869 if (me_arg->attr.dimension)
10871 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10872 "must be scalar", me_arg->name, c->name, me_arg->name,
10878 if (me_arg->attr.pointer)
10880 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10881 "may not have the POINTER attribute", me_arg->name,
10882 c->name, me_arg->name, &c->loc);
10887 if (me_arg->attr.allocatable)
10889 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10890 "may not be ALLOCATABLE", me_arg->name, c->name,
10891 me_arg->name, &c->loc);
10896 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
10897 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10898 " at %L", c->name, &c->loc);
10902 /* Check type-spec if this is not the parent-type component. */
10903 if ((!sym->attr.extension || c != sym->components)
10904 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
10907 /* If this type is an extension, set the accessibility of the parent
10909 if (super_type && c == sym->components
10910 && strcmp (super_type->name, c->name) == 0)
10911 c->attr.access = super_type->attr.access;
10913 /* If this type is an extension, see if this component has the same name
10914 as an inherited type-bound procedure. */
10915 if (super_type && !sym->attr.is_class
10916 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
10918 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
10919 " inherited type-bound procedure",
10920 c->name, sym->name, &c->loc);
10924 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
10926 if (c->ts.u.cl->length == NULL
10927 || (resolve_charlen (c->ts.u.cl) == FAILURE)
10928 || !gfc_is_constant_expr (c->ts.u.cl->length))
10930 gfc_error ("Character length of component '%s' needs to "
10931 "be a constant specification expression at %L",
10933 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
10938 if (c->ts.type == BT_DERIVED
10939 && sym->component_access != ACCESS_PRIVATE
10940 && gfc_check_access (sym->attr.access, sym->ns->default_access)
10941 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
10942 && !c->ts.u.derived->attr.use_assoc
10943 && !gfc_check_access (c->ts.u.derived->attr.access,
10944 c->ts.u.derived->ns->default_access)
10945 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
10946 "is a PRIVATE type and cannot be a component of "
10947 "'%s', which is PUBLIC at %L", c->name,
10948 sym->name, &sym->declared_at) == FAILURE)
10951 if (sym->attr.sequence)
10953 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
10955 gfc_error ("Component %s of SEQUENCE type declared at %L does "
10956 "not have the SEQUENCE attribute",
10957 c->ts.u.derived->name, &sym->declared_at);
10962 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && c->attr.pointer
10963 && c->ts.u.derived->components == NULL
10964 && !c->ts.u.derived->attr.zero_comp)
10966 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10967 "that has not been declared", c->name, sym->name,
10972 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.pointer
10973 && CLASS_DATA (c)->ts.u.derived->components == NULL
10974 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
10976 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
10977 "that has not been declared", c->name, sym->name,
10983 if (c->ts.type == BT_CLASS
10984 && !(CLASS_DATA (c)->attr.pointer || CLASS_DATA (c)->attr.allocatable))
10986 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
10987 "or pointer", c->name, &c->loc);
10991 /* Ensure that all the derived type components are put on the
10992 derived type list; even in formal namespaces, where derived type
10993 pointer components might not have been declared. */
10994 if (c->ts.type == BT_DERIVED
10996 && c->ts.u.derived->components
10998 && sym != c->ts.u.derived)
10999 add_dt_to_dt_list (c->ts.u.derived);
11001 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
11005 for (i = 0; i < c->as->rank; i++)
11007 if (c->as->lower[i] == NULL
11008 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
11009 || !gfc_is_constant_expr (c->as->lower[i])
11010 || c->as->upper[i] == NULL
11011 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
11012 || !gfc_is_constant_expr (c->as->upper[i]))
11014 gfc_error ("Component '%s' of '%s' at %L must have "
11015 "constant array bounds",
11016 c->name, sym->name, &c->loc);
11022 /* Resolve the type-bound procedures. */
11023 if (resolve_typebound_procedures (sym) == FAILURE)
11026 /* Resolve the finalizer procedures. */
11027 if (gfc_resolve_finalizers (sym) == FAILURE)
11030 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11031 all DEFERRED bindings are overridden. */
11032 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11033 && ensure_not_abstract (sym, super_type) == FAILURE)
11036 /* Add derived type to the derived type list. */
11037 add_dt_to_dt_list (sym);
11044 resolve_fl_namelist (gfc_symbol *sym)
11049 /* Reject PRIVATE objects in a PUBLIC namelist. */
11050 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
11052 for (nl = sym->namelist; nl; nl = nl->next)
11054 if (!nl->sym->attr.use_assoc
11055 && !is_sym_host_assoc (nl->sym, sym->ns)
11056 && !gfc_check_access(nl->sym->attr.access,
11057 nl->sym->ns->default_access))
11059 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11060 "cannot be member of PUBLIC namelist '%s' at %L",
11061 nl->sym->name, sym->name, &sym->declared_at);
11065 /* Types with private components that came here by USE-association. */
11066 if (nl->sym->ts.type == BT_DERIVED
11067 && derived_inaccessible (nl->sym->ts.u.derived))
11069 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11070 "components and cannot be member of namelist '%s' at %L",
11071 nl->sym->name, sym->name, &sym->declared_at);
11075 /* Types with private components that are defined in the same module. */
11076 if (nl->sym->ts.type == BT_DERIVED
11077 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11078 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
11079 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
11080 nl->sym->ns->default_access))
11082 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11083 "cannot be a member of PUBLIC namelist '%s' at %L",
11084 nl->sym->name, sym->name, &sym->declared_at);
11090 for (nl = sym->namelist; nl; nl = nl->next)
11092 /* Reject namelist arrays of assumed shape. */
11093 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11094 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
11095 "must not have assumed shape in namelist "
11096 "'%s' at %L", nl->sym->name, sym->name,
11097 &sym->declared_at) == FAILURE)
11100 /* Reject namelist arrays that are not constant shape. */
11101 if (is_non_constant_shape_array (nl->sym))
11103 gfc_error ("NAMELIST array object '%s' must have constant "
11104 "shape in namelist '%s' at %L", nl->sym->name,
11105 sym->name, &sym->declared_at);
11109 /* Namelist objects cannot have allocatable or pointer components. */
11110 if (nl->sym->ts.type != BT_DERIVED)
11113 if (nl->sym->ts.u.derived->attr.alloc_comp)
11115 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11116 "have ALLOCATABLE components",
11117 nl->sym->name, sym->name, &sym->declared_at);
11121 if (nl->sym->ts.u.derived->attr.pointer_comp)
11123 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11124 "have POINTER components",
11125 nl->sym->name, sym->name, &sym->declared_at);
11131 /* 14.1.2 A module or internal procedure represent local entities
11132 of the same type as a namelist member and so are not allowed. */
11133 for (nl = sym->namelist; nl; nl = nl->next)
11135 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11138 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11139 if ((nl->sym == sym->ns->proc_name)
11141 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11145 if (nl->sym && nl->sym->name)
11146 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11147 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11149 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11150 "attribute in '%s' at %L", nlsym->name,
11151 &sym->declared_at);
11161 resolve_fl_parameter (gfc_symbol *sym)
11163 /* A parameter array's shape needs to be constant. */
11164 if (sym->as != NULL
11165 && (sym->as->type == AS_DEFERRED
11166 || is_non_constant_shape_array (sym)))
11168 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11169 "or of deferred shape", sym->name, &sym->declared_at);
11173 /* Make sure a parameter that has been implicitly typed still
11174 matches the implicit type, since PARAMETER statements can precede
11175 IMPLICIT statements. */
11176 if (sym->attr.implicit_type
11177 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11180 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11181 "later IMPLICIT type", sym->name, &sym->declared_at);
11185 /* Make sure the types of derived parameters are consistent. This
11186 type checking is deferred until resolution because the type may
11187 refer to a derived type from the host. */
11188 if (sym->ts.type == BT_DERIVED
11189 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11191 gfc_error ("Incompatible derived type in PARAMETER at %L",
11192 &sym->value->where);
11199 /* Do anything necessary to resolve a symbol. Right now, we just
11200 assume that an otherwise unknown symbol is a variable. This sort
11201 of thing commonly happens for symbols in module. */
11204 resolve_symbol (gfc_symbol *sym)
11206 int check_constant, mp_flag;
11207 gfc_symtree *symtree;
11208 gfc_symtree *this_symtree;
11212 /* Avoid double resolution of function result symbols. */
11213 if ((sym->result || sym->attr.result) && (sym->ns != gfc_current_ns))
11216 if (sym->attr.flavor == FL_UNKNOWN)
11219 /* If we find that a flavorless symbol is an interface in one of the
11220 parent namespaces, find its symtree in this namespace, free the
11221 symbol and set the symtree to point to the interface symbol. */
11222 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11224 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11225 if (symtree && symtree->n.sym->generic)
11227 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11231 gfc_free_symbol (sym);
11232 symtree->n.sym->refs++;
11233 this_symtree->n.sym = symtree->n.sym;
11238 /* Otherwise give it a flavor according to such attributes as
11240 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11241 sym->attr.flavor = FL_VARIABLE;
11244 sym->attr.flavor = FL_PROCEDURE;
11245 if (sym->attr.dimension)
11246 sym->attr.function = 1;
11250 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11251 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11253 if (sym->attr.procedure && sym->ts.interface
11254 && sym->attr.if_source != IFSRC_DECL)
11256 if (sym->ts.interface == sym)
11258 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11259 "interface", sym->name, &sym->declared_at);
11262 if (sym->ts.interface->attr.procedure)
11264 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11265 " in a later PROCEDURE statement", sym->ts.interface->name,
11266 sym->name,&sym->declared_at);
11270 /* Get the attributes from the interface (now resolved). */
11271 if (sym->ts.interface->attr.if_source
11272 || sym->ts.interface->attr.intrinsic)
11274 gfc_symbol *ifc = sym->ts.interface;
11275 resolve_symbol (ifc);
11277 if (ifc->attr.intrinsic)
11278 resolve_intrinsic (ifc, &ifc->declared_at);
11281 sym->ts = ifc->result->ts;
11284 sym->ts.interface = ifc;
11285 sym->attr.function = ifc->attr.function;
11286 sym->attr.subroutine = ifc->attr.subroutine;
11287 gfc_copy_formal_args (sym, ifc);
11289 sym->attr.allocatable = ifc->attr.allocatable;
11290 sym->attr.pointer = ifc->attr.pointer;
11291 sym->attr.pure = ifc->attr.pure;
11292 sym->attr.elemental = ifc->attr.elemental;
11293 sym->attr.dimension = ifc->attr.dimension;
11294 sym->attr.recursive = ifc->attr.recursive;
11295 sym->attr.always_explicit = ifc->attr.always_explicit;
11296 sym->attr.ext_attr |= ifc->attr.ext_attr;
11297 /* Copy array spec. */
11298 sym->as = gfc_copy_array_spec (ifc->as);
11302 for (i = 0; i < sym->as->rank; i++)
11304 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11305 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11308 /* Copy char length. */
11309 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11311 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11312 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11313 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
11314 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
11318 else if (sym->ts.interface->name[0] != '\0')
11320 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11321 sym->ts.interface->name, sym->name, &sym->declared_at);
11326 if (sym->attr.is_protected && !sym->attr.proc_pointer
11327 && (sym->attr.procedure || sym->attr.external))
11329 if (sym->attr.external)
11330 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11331 "at %L", &sym->declared_at);
11333 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11334 "at %L", &sym->declared_at);
11339 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11342 /* Symbols that are module procedures with results (functions) have
11343 the types and array specification copied for type checking in
11344 procedures that call them, as well as for saving to a module
11345 file. These symbols can't stand the scrutiny that their results
11347 mp_flag = (sym->result != NULL && sym->result != sym);
11349 /* Make sure that the intrinsic is consistent with its internal
11350 representation. This needs to be done before assigning a default
11351 type to avoid spurious warnings. */
11352 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11353 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11356 /* For associate names, resolve corresponding expression and make sure
11357 they get their type-spec set this way. */
11360 gcc_assert (sym->attr.flavor == FL_VARIABLE);
11361 if (gfc_resolve_expr (sym->assoc->target) != SUCCESS)
11364 sym->ts = sym->assoc->target->ts;
11365 gcc_assert (sym->ts.type != BT_UNKNOWN);
11368 /* Assign default type to symbols that need one and don't have one. */
11369 if (sym->ts.type == BT_UNKNOWN)
11371 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11372 gfc_set_default_type (sym, 1, NULL);
11374 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11375 && !sym->attr.function && !sym->attr.subroutine
11376 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11377 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11379 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11381 /* The specific case of an external procedure should emit an error
11382 in the case that there is no implicit type. */
11384 gfc_set_default_type (sym, sym->attr.external, NULL);
11387 /* Result may be in another namespace. */
11388 resolve_symbol (sym->result);
11390 if (!sym->result->attr.proc_pointer)
11392 sym->ts = sym->result->ts;
11393 sym->as = gfc_copy_array_spec (sym->result->as);
11394 sym->attr.dimension = sym->result->attr.dimension;
11395 sym->attr.pointer = sym->result->attr.pointer;
11396 sym->attr.allocatable = sym->result->attr.allocatable;
11402 /* Assumed size arrays and assumed shape arrays must be dummy
11405 if (sym->as != NULL
11406 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11407 || sym->as->type == AS_ASSUMED_SHAPE)
11408 && sym->attr.dummy == 0)
11410 if (sym->as->type == AS_ASSUMED_SIZE)
11411 gfc_error ("Assumed size array at %L must be a dummy argument",
11412 &sym->declared_at);
11414 gfc_error ("Assumed shape array at %L must be a dummy argument",
11415 &sym->declared_at);
11419 /* Make sure symbols with known intent or optional are really dummy
11420 variable. Because of ENTRY statement, this has to be deferred
11421 until resolution time. */
11423 if (!sym->attr.dummy
11424 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11426 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11430 if (sym->attr.value && !sym->attr.dummy)
11432 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11433 "it is not a dummy argument", sym->name, &sym->declared_at);
11437 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11439 gfc_charlen *cl = sym->ts.u.cl;
11440 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11442 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11443 "attribute must have constant length",
11444 sym->name, &sym->declared_at);
11448 if (sym->ts.is_c_interop
11449 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11451 gfc_error ("C interoperable character dummy variable '%s' at %L "
11452 "with VALUE attribute must have length one",
11453 sym->name, &sym->declared_at);
11458 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11459 do this for something that was implicitly typed because that is handled
11460 in gfc_set_default_type. Handle dummy arguments and procedure
11461 definitions separately. Also, anything that is use associated is not
11462 handled here but instead is handled in the module it is declared in.
11463 Finally, derived type definitions are allowed to be BIND(C) since that
11464 only implies that they're interoperable, and they are checked fully for
11465 interoperability when a variable is declared of that type. */
11466 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11467 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11468 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11470 gfc_try t = SUCCESS;
11472 /* First, make sure the variable is declared at the
11473 module-level scope (J3/04-007, Section 15.3). */
11474 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11475 sym->attr.in_common == 0)
11477 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11478 "is neither a COMMON block nor declared at the "
11479 "module level scope", sym->name, &(sym->declared_at));
11482 else if (sym->common_head != NULL)
11484 t = verify_com_block_vars_c_interop (sym->common_head);
11488 /* If type() declaration, we need to verify that the components
11489 of the given type are all C interoperable, etc. */
11490 if (sym->ts.type == BT_DERIVED &&
11491 sym->ts.u.derived->attr.is_c_interop != 1)
11493 /* Make sure the user marked the derived type as BIND(C). If
11494 not, call the verify routine. This could print an error
11495 for the derived type more than once if multiple variables
11496 of that type are declared. */
11497 if (sym->ts.u.derived->attr.is_bind_c != 1)
11498 verify_bind_c_derived_type (sym->ts.u.derived);
11502 /* Verify the variable itself as C interoperable if it
11503 is BIND(C). It is not possible for this to succeed if
11504 the verify_bind_c_derived_type failed, so don't have to handle
11505 any error returned by verify_bind_c_derived_type. */
11506 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11507 sym->common_block);
11512 /* clear the is_bind_c flag to prevent reporting errors more than
11513 once if something failed. */
11514 sym->attr.is_bind_c = 0;
11519 /* If a derived type symbol has reached this point, without its
11520 type being declared, we have an error. Notice that most
11521 conditions that produce undefined derived types have already
11522 been dealt with. However, the likes of:
11523 implicit type(t) (t) ..... call foo (t) will get us here if
11524 the type is not declared in the scope of the implicit
11525 statement. Change the type to BT_UNKNOWN, both because it is so
11526 and to prevent an ICE. */
11527 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11528 && !sym->ts.u.derived->attr.zero_comp)
11530 gfc_error ("The derived type '%s' at %L is of type '%s', "
11531 "which has not been defined", sym->name,
11532 &sym->declared_at, sym->ts.u.derived->name);
11533 sym->ts.type = BT_UNKNOWN;
11537 /* Make sure that the derived type has been resolved and that the
11538 derived type is visible in the symbol's namespace, if it is a
11539 module function and is not PRIVATE. */
11540 if (sym->ts.type == BT_DERIVED
11541 && sym->ts.u.derived->attr.use_assoc
11542 && sym->ns->proc_name
11543 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11547 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11550 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11551 if (!ds && sym->attr.function
11552 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11554 symtree = gfc_new_symtree (&sym->ns->sym_root,
11555 sym->ts.u.derived->name);
11556 symtree->n.sym = sym->ts.u.derived;
11557 sym->ts.u.derived->refs++;
11561 /* Unless the derived-type declaration is use associated, Fortran 95
11562 does not allow public entries of private derived types.
11563 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11564 161 in 95-006r3. */
11565 if (sym->ts.type == BT_DERIVED
11566 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11567 && !sym->ts.u.derived->attr.use_assoc
11568 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11569 && !gfc_check_access (sym->ts.u.derived->attr.access,
11570 sym->ts.u.derived->ns->default_access)
11571 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11572 "of PRIVATE derived type '%s'",
11573 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11574 : "variable", sym->name, &sym->declared_at,
11575 sym->ts.u.derived->name) == FAILURE)
11578 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11579 default initialization is defined (5.1.2.4.4). */
11580 if (sym->ts.type == BT_DERIVED
11582 && sym->attr.intent == INTENT_OUT
11584 && sym->as->type == AS_ASSUMED_SIZE)
11586 for (c = sym->ts.u.derived->components; c; c = c->next)
11588 if (c->initializer)
11590 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11591 "ASSUMED SIZE and so cannot have a default initializer",
11592 sym->name, &sym->declared_at);
11599 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11600 || sym->attr.codimension)
11601 && sym->attr.result)
11602 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11603 "a coarray component", sym->name, &sym->declared_at);
11606 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11607 && sym->ts.u.derived->ts.is_iso_c)
11608 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11609 "shall not be a coarray", sym->name, &sym->declared_at);
11612 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11613 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11614 || sym->attr.allocatable))
11615 gfc_error ("Variable '%s' at %L with coarray component "
11616 "shall be a nonpointer, nonallocatable scalar",
11617 sym->name, &sym->declared_at);
11619 /* F2008, C526. The function-result case was handled above. */
11620 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11621 || sym->attr.codimension)
11622 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11623 || sym->ns->proc_name->attr.flavor == FL_MODULE
11624 || sym->ns->proc_name->attr.is_main_program
11625 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11626 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11627 "component and is not ALLOCATABLE, SAVE nor a "
11628 "dummy argument", sym->name, &sym->declared_at);
11629 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11630 else if (sym->attr.codimension && !sym->attr.allocatable
11631 && sym->as && sym->as->cotype == AS_DEFERRED)
11632 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11633 "deferred shape", sym->name, &sym->declared_at);
11634 else if (sym->attr.codimension && sym->attr.allocatable
11635 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11636 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11637 "deferred shape", sym->name, &sym->declared_at);
11641 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11642 || (sym->attr.codimension && sym->attr.allocatable))
11643 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11644 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11645 "allocatable coarray or have coarray components",
11646 sym->name, &sym->declared_at);
11648 if (sym->attr.codimension && sym->attr.dummy
11649 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11650 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11651 "procedure '%s'", sym->name, &sym->declared_at,
11652 sym->ns->proc_name->name);
11654 switch (sym->attr.flavor)
11657 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11662 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11667 if (resolve_fl_namelist (sym) == FAILURE)
11672 if (resolve_fl_parameter (sym) == FAILURE)
11680 /* Resolve array specifier. Check as well some constraints
11681 on COMMON blocks. */
11683 check_constant = sym->attr.in_common && !sym->attr.pointer;
11685 /* Set the formal_arg_flag so that check_conflict will not throw
11686 an error for host associated variables in the specification
11687 expression for an array_valued function. */
11688 if (sym->attr.function && sym->as)
11689 formal_arg_flag = 1;
11691 gfc_resolve_array_spec (sym->as, check_constant);
11693 formal_arg_flag = 0;
11695 /* Resolve formal namespaces. */
11696 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11697 && !sym->attr.contained && !sym->attr.intrinsic)
11698 gfc_resolve (sym->formal_ns);
11700 /* Make sure the formal namespace is present. */
11701 if (sym->formal && !sym->formal_ns)
11703 gfc_formal_arglist *formal = sym->formal;
11704 while (formal && !formal->sym)
11705 formal = formal->next;
11709 sym->formal_ns = formal->sym->ns;
11710 sym->formal_ns->refs++;
11714 /* Check threadprivate restrictions. */
11715 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11716 && (!sym->attr.in_common
11717 && sym->module == NULL
11718 && (sym->ns->proc_name == NULL
11719 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11720 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11722 /* If we have come this far we can apply default-initializers, as
11723 described in 14.7.5, to those variables that have not already
11724 been assigned one. */
11725 if (sym->ts.type == BT_DERIVED
11726 && sym->attr.referenced
11727 && sym->ns == gfc_current_ns
11729 && !sym->attr.allocatable
11730 && !sym->attr.alloc_comp)
11732 symbol_attribute *a = &sym->attr;
11734 if ((!a->save && !a->dummy && !a->pointer
11735 && !a->in_common && !a->use_assoc
11736 && !(a->function && sym != sym->result))
11737 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11738 apply_default_init (sym);
11741 /* If this symbol has a type-spec, check it. */
11742 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11743 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11744 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11750 /************* Resolve DATA statements *************/
11754 gfc_data_value *vnode;
11760 /* Advance the values structure to point to the next value in the data list. */
11763 next_data_value (void)
11765 while (mpz_cmp_ui (values.left, 0) == 0)
11768 if (values.vnode->next == NULL)
11771 values.vnode = values.vnode->next;
11772 mpz_set (values.left, values.vnode->repeat);
11780 check_data_variable (gfc_data_variable *var, locus *where)
11786 ar_type mark = AR_UNKNOWN;
11788 mpz_t section_index[GFC_MAX_DIMENSIONS];
11794 if (gfc_resolve_expr (var->expr) == FAILURE)
11798 mpz_init_set_si (offset, 0);
11801 if (e->expr_type != EXPR_VARIABLE)
11802 gfc_internal_error ("check_data_variable(): Bad expression");
11804 sym = e->symtree->n.sym;
11806 if (sym->ns->is_block_data && !sym->attr.in_common)
11808 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11809 sym->name, &sym->declared_at);
11812 if (e->ref == NULL && sym->as)
11814 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11815 " declaration", sym->name, where);
11819 has_pointer = sym->attr.pointer;
11821 for (ref = e->ref; ref; ref = ref->next)
11823 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11826 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11828 gfc_error ("DATA element '%s' at %L cannot have a coindex",
11834 && ref->type == REF_ARRAY
11835 && ref->u.ar.type != AR_FULL)
11837 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11838 "be a full array", sym->name, where);
11843 if (e->rank == 0 || has_pointer)
11845 mpz_init_set_ui (size, 1);
11852 /* Find the array section reference. */
11853 for (ref = e->ref; ref; ref = ref->next)
11855 if (ref->type != REF_ARRAY)
11857 if (ref->u.ar.type == AR_ELEMENT)
11863 /* Set marks according to the reference pattern. */
11864 switch (ref->u.ar.type)
11872 /* Get the start position of array section. */
11873 gfc_get_section_index (ar, section_index, &offset);
11878 gcc_unreachable ();
11881 if (gfc_array_size (e, &size) == FAILURE)
11883 gfc_error ("Nonconstant array section at %L in DATA statement",
11885 mpz_clear (offset);
11892 while (mpz_cmp_ui (size, 0) > 0)
11894 if (next_data_value () == FAILURE)
11896 gfc_error ("DATA statement at %L has more variables than values",
11902 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
11906 /* If we have more than one element left in the repeat count,
11907 and we have more than one element left in the target variable,
11908 then create a range assignment. */
11909 /* FIXME: Only done for full arrays for now, since array sections
11911 if (mark == AR_FULL && ref && ref->next == NULL
11912 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
11916 if (mpz_cmp (size, values.left) >= 0)
11918 mpz_init_set (range, values.left);
11919 mpz_sub (size, size, values.left);
11920 mpz_set_ui (values.left, 0);
11924 mpz_init_set (range, size);
11925 mpz_sub (values.left, values.left, size);
11926 mpz_set_ui (size, 0);
11929 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
11932 mpz_add (offset, offset, range);
11939 /* Assign initial value to symbol. */
11942 mpz_sub_ui (values.left, values.left, 1);
11943 mpz_sub_ui (size, size, 1);
11945 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
11949 if (mark == AR_FULL)
11950 mpz_add_ui (offset, offset, 1);
11952 /* Modify the array section indexes and recalculate the offset
11953 for next element. */
11954 else if (mark == AR_SECTION)
11955 gfc_advance_section (section_index, ar, &offset);
11959 if (mark == AR_SECTION)
11961 for (i = 0; i < ar->dimen; i++)
11962 mpz_clear (section_index[i]);
11966 mpz_clear (offset);
11972 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
11974 /* Iterate over a list of elements in a DATA statement. */
11977 traverse_data_list (gfc_data_variable *var, locus *where)
11980 iterator_stack frame;
11981 gfc_expr *e, *start, *end, *step;
11982 gfc_try retval = SUCCESS;
11984 mpz_init (frame.value);
11987 start = gfc_copy_expr (var->iter.start);
11988 end = gfc_copy_expr (var->iter.end);
11989 step = gfc_copy_expr (var->iter.step);
11991 if (gfc_simplify_expr (start, 1) == FAILURE
11992 || start->expr_type != EXPR_CONSTANT)
11994 gfc_error ("start of implied-do loop at %L could not be "
11995 "simplified to a constant value", &start->where);
11999 if (gfc_simplify_expr (end, 1) == FAILURE
12000 || end->expr_type != EXPR_CONSTANT)
12002 gfc_error ("end of implied-do loop at %L could not be "
12003 "simplified to a constant value", &start->where);
12007 if (gfc_simplify_expr (step, 1) == FAILURE
12008 || step->expr_type != EXPR_CONSTANT)
12010 gfc_error ("step of implied-do loop at %L could not be "
12011 "simplified to a constant value", &start->where);
12016 mpz_set (trip, end->value.integer);
12017 mpz_sub (trip, trip, start->value.integer);
12018 mpz_add (trip, trip, step->value.integer);
12020 mpz_div (trip, trip, step->value.integer);
12022 mpz_set (frame.value, start->value.integer);
12024 frame.prev = iter_stack;
12025 frame.variable = var->iter.var->symtree;
12026 iter_stack = &frame;
12028 while (mpz_cmp_ui (trip, 0) > 0)
12030 if (traverse_data_var (var->list, where) == FAILURE)
12036 e = gfc_copy_expr (var->expr);
12037 if (gfc_simplify_expr (e, 1) == FAILURE)
12044 mpz_add (frame.value, frame.value, step->value.integer);
12046 mpz_sub_ui (trip, trip, 1);
12050 mpz_clear (frame.value);
12053 gfc_free_expr (start);
12054 gfc_free_expr (end);
12055 gfc_free_expr (step);
12057 iter_stack = frame.prev;
12062 /* Type resolve variables in the variable list of a DATA statement. */
12065 traverse_data_var (gfc_data_variable *var, locus *where)
12069 for (; var; var = var->next)
12071 if (var->expr == NULL)
12072 t = traverse_data_list (var, where);
12074 t = check_data_variable (var, where);
12084 /* Resolve the expressions and iterators associated with a data statement.
12085 This is separate from the assignment checking because data lists should
12086 only be resolved once. */
12089 resolve_data_variables (gfc_data_variable *d)
12091 for (; d; d = d->next)
12093 if (d->list == NULL)
12095 if (gfc_resolve_expr (d->expr) == FAILURE)
12100 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12103 if (resolve_data_variables (d->list) == FAILURE)
12112 /* Resolve a single DATA statement. We implement this by storing a pointer to
12113 the value list into static variables, and then recursively traversing the
12114 variables list, expanding iterators and such. */
12117 resolve_data (gfc_data *d)
12120 if (resolve_data_variables (d->var) == FAILURE)
12123 values.vnode = d->value;
12124 if (d->value == NULL)
12125 mpz_set_ui (values.left, 0);
12127 mpz_set (values.left, d->value->repeat);
12129 if (traverse_data_var (d->var, &d->where) == FAILURE)
12132 /* At this point, we better not have any values left. */
12134 if (next_data_value () == SUCCESS)
12135 gfc_error ("DATA statement at %L has more values than variables",
12140 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12141 accessed by host or use association, is a dummy argument to a pure function,
12142 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12143 is storage associated with any such variable, shall not be used in the
12144 following contexts: (clients of this function). */
12146 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12147 procedure. Returns zero if assignment is OK, nonzero if there is a
12150 gfc_impure_variable (gfc_symbol *sym)
12155 if (sym->attr.use_assoc || sym->attr.in_common)
12158 /* Check if the symbol's ns is inside the pure procedure. */
12159 for (ns = gfc_current_ns; ns; ns = ns->parent)
12163 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12167 proc = sym->ns->proc_name;
12168 if (sym->attr.dummy && gfc_pure (proc)
12169 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12171 proc->attr.function))
12174 /* TODO: Sort out what can be storage associated, if anything, and include
12175 it here. In principle equivalences should be scanned but it does not
12176 seem to be possible to storage associate an impure variable this way. */
12181 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12182 current namespace is inside a pure procedure. */
12185 gfc_pure (gfc_symbol *sym)
12187 symbol_attribute attr;
12192 /* Check if the current namespace or one of its parents
12193 belongs to a pure procedure. */
12194 for (ns = gfc_current_ns; ns; ns = ns->parent)
12196 sym = ns->proc_name;
12200 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12208 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12212 /* Test whether the current procedure is elemental or not. */
12215 gfc_elemental (gfc_symbol *sym)
12217 symbol_attribute attr;
12220 sym = gfc_current_ns->proc_name;
12225 return attr.flavor == FL_PROCEDURE && attr.elemental;
12229 /* Warn about unused labels. */
12232 warn_unused_fortran_label (gfc_st_label *label)
12237 warn_unused_fortran_label (label->left);
12239 if (label->defined == ST_LABEL_UNKNOWN)
12242 switch (label->referenced)
12244 case ST_LABEL_UNKNOWN:
12245 gfc_warning ("Label %d at %L defined but not used", label->value,
12249 case ST_LABEL_BAD_TARGET:
12250 gfc_warning ("Label %d at %L defined but cannot be used",
12251 label->value, &label->where);
12258 warn_unused_fortran_label (label->right);
12262 /* Returns the sequence type of a symbol or sequence. */
12265 sequence_type (gfc_typespec ts)
12274 if (ts.u.derived->components == NULL)
12275 return SEQ_NONDEFAULT;
12277 result = sequence_type (ts.u.derived->components->ts);
12278 for (c = ts.u.derived->components->next; c; c = c->next)
12279 if (sequence_type (c->ts) != result)
12285 if (ts.kind != gfc_default_character_kind)
12286 return SEQ_NONDEFAULT;
12288 return SEQ_CHARACTER;
12291 if (ts.kind != gfc_default_integer_kind)
12292 return SEQ_NONDEFAULT;
12294 return SEQ_NUMERIC;
12297 if (!(ts.kind == gfc_default_real_kind
12298 || ts.kind == gfc_default_double_kind))
12299 return SEQ_NONDEFAULT;
12301 return SEQ_NUMERIC;
12304 if (ts.kind != gfc_default_complex_kind)
12305 return SEQ_NONDEFAULT;
12307 return SEQ_NUMERIC;
12310 if (ts.kind != gfc_default_logical_kind)
12311 return SEQ_NONDEFAULT;
12313 return SEQ_NUMERIC;
12316 return SEQ_NONDEFAULT;
12321 /* Resolve derived type EQUIVALENCE object. */
12324 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12326 gfc_component *c = derived->components;
12331 /* Shall not be an object of nonsequence derived type. */
12332 if (!derived->attr.sequence)
12334 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12335 "attribute to be an EQUIVALENCE object", sym->name,
12340 /* Shall not have allocatable components. */
12341 if (derived->attr.alloc_comp)
12343 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12344 "components to be an EQUIVALENCE object",sym->name,
12349 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
12351 gfc_error ("Derived type variable '%s' at %L with default "
12352 "initialization cannot be in EQUIVALENCE with a variable "
12353 "in COMMON", sym->name, &e->where);
12357 for (; c ; c = c->next)
12359 if (c->ts.type == BT_DERIVED
12360 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12363 /* Shall not be an object of sequence derived type containing a pointer
12364 in the structure. */
12365 if (c->attr.pointer)
12367 gfc_error ("Derived type variable '%s' at %L with pointer "
12368 "component(s) cannot be an EQUIVALENCE object",
12369 sym->name, &e->where);
12377 /* Resolve equivalence object.
12378 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12379 an allocatable array, an object of nonsequence derived type, an object of
12380 sequence derived type containing a pointer at any level of component
12381 selection, an automatic object, a function name, an entry name, a result
12382 name, a named constant, a structure component, or a subobject of any of
12383 the preceding objects. A substring shall not have length zero. A
12384 derived type shall not have components with default initialization nor
12385 shall two objects of an equivalence group be initialized.
12386 Either all or none of the objects shall have an protected attribute.
12387 The simple constraints are done in symbol.c(check_conflict) and the rest
12388 are implemented here. */
12391 resolve_equivalence (gfc_equiv *eq)
12394 gfc_symbol *first_sym;
12397 locus *last_where = NULL;
12398 seq_type eq_type, last_eq_type;
12399 gfc_typespec *last_ts;
12400 int object, cnt_protected;
12403 last_ts = &eq->expr->symtree->n.sym->ts;
12405 first_sym = eq->expr->symtree->n.sym;
12409 for (object = 1; eq; eq = eq->eq, object++)
12413 e->ts = e->symtree->n.sym->ts;
12414 /* match_varspec might not know yet if it is seeing
12415 array reference or substring reference, as it doesn't
12417 if (e->ref && e->ref->type == REF_ARRAY)
12419 gfc_ref *ref = e->ref;
12420 sym = e->symtree->n.sym;
12422 if (sym->attr.dimension)
12424 ref->u.ar.as = sym->as;
12428 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12429 if (e->ts.type == BT_CHARACTER
12431 && ref->type == REF_ARRAY
12432 && ref->u.ar.dimen == 1
12433 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12434 && ref->u.ar.stride[0] == NULL)
12436 gfc_expr *start = ref->u.ar.start[0];
12437 gfc_expr *end = ref->u.ar.end[0];
12440 /* Optimize away the (:) reference. */
12441 if (start == NULL && end == NULL)
12444 e->ref = ref->next;
12446 e->ref->next = ref->next;
12451 ref->type = REF_SUBSTRING;
12453 start = gfc_get_int_expr (gfc_default_integer_kind,
12455 ref->u.ss.start = start;
12456 if (end == NULL && e->ts.u.cl)
12457 end = gfc_copy_expr (e->ts.u.cl->length);
12458 ref->u.ss.end = end;
12459 ref->u.ss.length = e->ts.u.cl;
12466 /* Any further ref is an error. */
12469 gcc_assert (ref->type == REF_ARRAY);
12470 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12476 if (gfc_resolve_expr (e) == FAILURE)
12479 sym = e->symtree->n.sym;
12481 if (sym->attr.is_protected)
12483 if (cnt_protected > 0 && cnt_protected != object)
12485 gfc_error ("Either all or none of the objects in the "
12486 "EQUIVALENCE set at %L shall have the "
12487 "PROTECTED attribute",
12492 /* Shall not equivalence common block variables in a PURE procedure. */
12493 if (sym->ns->proc_name
12494 && sym->ns->proc_name->attr.pure
12495 && sym->attr.in_common)
12497 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12498 "object in the pure procedure '%s'",
12499 sym->name, &e->where, sym->ns->proc_name->name);
12503 /* Shall not be a named constant. */
12504 if (e->expr_type == EXPR_CONSTANT)
12506 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12507 "object", sym->name, &e->where);
12511 if (e->ts.type == BT_DERIVED
12512 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12515 /* Check that the types correspond correctly:
12517 A numeric sequence structure may be equivalenced to another sequence
12518 structure, an object of default integer type, default real type, double
12519 precision real type, default logical type such that components of the
12520 structure ultimately only become associated to objects of the same
12521 kind. A character sequence structure may be equivalenced to an object
12522 of default character kind or another character sequence structure.
12523 Other objects may be equivalenced only to objects of the same type and
12524 kind parameters. */
12526 /* Identical types are unconditionally OK. */
12527 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12528 goto identical_types;
12530 last_eq_type = sequence_type (*last_ts);
12531 eq_type = sequence_type (sym->ts);
12533 /* Since the pair of objects is not of the same type, mixed or
12534 non-default sequences can be rejected. */
12536 msg = "Sequence %s with mixed components in EQUIVALENCE "
12537 "statement at %L with different type objects";
12539 && last_eq_type == SEQ_MIXED
12540 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12542 || (eq_type == SEQ_MIXED
12543 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12544 &e->where) == FAILURE))
12547 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12548 "statement at %L with objects of different type";
12550 && last_eq_type == SEQ_NONDEFAULT
12551 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12552 last_where) == FAILURE)
12553 || (eq_type == SEQ_NONDEFAULT
12554 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12555 &e->where) == FAILURE))
12558 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12559 "EQUIVALENCE statement at %L";
12560 if (last_eq_type == SEQ_CHARACTER
12561 && eq_type != SEQ_CHARACTER
12562 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12563 &e->where) == FAILURE)
12566 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12567 "EQUIVALENCE statement at %L";
12568 if (last_eq_type == SEQ_NUMERIC
12569 && eq_type != SEQ_NUMERIC
12570 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12571 &e->where) == FAILURE)
12576 last_where = &e->where;
12581 /* Shall not be an automatic array. */
12582 if (e->ref->type == REF_ARRAY
12583 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12585 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12586 "an EQUIVALENCE object", sym->name, &e->where);
12593 /* Shall not be a structure component. */
12594 if (r->type == REF_COMPONENT)
12596 gfc_error ("Structure component '%s' at %L cannot be an "
12597 "EQUIVALENCE object",
12598 r->u.c.component->name, &e->where);
12602 /* A substring shall not have length zero. */
12603 if (r->type == REF_SUBSTRING)
12605 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12607 gfc_error ("Substring at %L has length zero",
12608 &r->u.ss.start->where);
12618 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12621 resolve_fntype (gfc_namespace *ns)
12623 gfc_entry_list *el;
12626 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12629 /* If there are any entries, ns->proc_name is the entry master
12630 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12632 sym = ns->entries->sym;
12634 sym = ns->proc_name;
12635 if (sym->result == sym
12636 && sym->ts.type == BT_UNKNOWN
12637 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12638 && !sym->attr.untyped)
12640 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12641 sym->name, &sym->declared_at);
12642 sym->attr.untyped = 1;
12645 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12646 && !sym->attr.contained
12647 && !gfc_check_access (sym->ts.u.derived->attr.access,
12648 sym->ts.u.derived->ns->default_access)
12649 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12651 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12652 "%L of PRIVATE type '%s'", sym->name,
12653 &sym->declared_at, sym->ts.u.derived->name);
12657 for (el = ns->entries->next; el; el = el->next)
12659 if (el->sym->result == el->sym
12660 && el->sym->ts.type == BT_UNKNOWN
12661 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12662 && !el->sym->attr.untyped)
12664 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12665 el->sym->name, &el->sym->declared_at);
12666 el->sym->attr.untyped = 1;
12672 /* 12.3.2.1.1 Defined operators. */
12675 check_uop_procedure (gfc_symbol *sym, locus where)
12677 gfc_formal_arglist *formal;
12679 if (!sym->attr.function)
12681 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12682 sym->name, &where);
12686 if (sym->ts.type == BT_CHARACTER
12687 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12688 && !(sym->result && sym->result->ts.u.cl
12689 && sym->result->ts.u.cl->length))
12691 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12692 "character length", sym->name, &where);
12696 formal = sym->formal;
12697 if (!formal || !formal->sym)
12699 gfc_error ("User operator procedure '%s' at %L must have at least "
12700 "one argument", sym->name, &where);
12704 if (formal->sym->attr.intent != INTENT_IN)
12706 gfc_error ("First argument of operator interface at %L must be "
12707 "INTENT(IN)", &where);
12711 if (formal->sym->attr.optional)
12713 gfc_error ("First argument of operator interface at %L cannot be "
12714 "optional", &where);
12718 formal = formal->next;
12719 if (!formal || !formal->sym)
12722 if (formal->sym->attr.intent != INTENT_IN)
12724 gfc_error ("Second argument of operator interface at %L must be "
12725 "INTENT(IN)", &where);
12729 if (formal->sym->attr.optional)
12731 gfc_error ("Second argument of operator interface at %L cannot be "
12732 "optional", &where);
12738 gfc_error ("Operator interface at %L must have, at most, two "
12739 "arguments", &where);
12747 gfc_resolve_uops (gfc_symtree *symtree)
12749 gfc_interface *itr;
12751 if (symtree == NULL)
12754 gfc_resolve_uops (symtree->left);
12755 gfc_resolve_uops (symtree->right);
12757 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12758 check_uop_procedure (itr->sym, itr->sym->declared_at);
12762 /* Examine all of the expressions associated with a program unit,
12763 assign types to all intermediate expressions, make sure that all
12764 assignments are to compatible types and figure out which names
12765 refer to which functions or subroutines. It doesn't check code
12766 block, which is handled by resolve_code. */
12769 resolve_types (gfc_namespace *ns)
12775 gfc_namespace* old_ns = gfc_current_ns;
12777 /* Check that all IMPLICIT types are ok. */
12778 if (!ns->seen_implicit_none)
12781 for (letter = 0; letter != GFC_LETTERS; ++letter)
12782 if (ns->set_flag[letter]
12783 && resolve_typespec_used (&ns->default_type[letter],
12784 &ns->implicit_loc[letter],
12789 gfc_current_ns = ns;
12791 resolve_entries (ns);
12793 resolve_common_vars (ns->blank_common.head, false);
12794 resolve_common_blocks (ns->common_root);
12796 resolve_contained_functions (ns);
12798 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12800 for (cl = ns->cl_list; cl; cl = cl->next)
12801 resolve_charlen (cl);
12803 gfc_traverse_ns (ns, resolve_symbol);
12805 resolve_fntype (ns);
12807 for (n = ns->contained; n; n = n->sibling)
12809 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12810 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12811 "also be PURE", n->proc_name->name,
12812 &n->proc_name->declared_at);
12818 gfc_check_interfaces (ns);
12820 gfc_traverse_ns (ns, resolve_values);
12826 for (d = ns->data; d; d = d->next)
12830 gfc_traverse_ns (ns, gfc_formalize_init_value);
12832 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12834 if (ns->common_root != NULL)
12835 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12837 for (eq = ns->equiv; eq; eq = eq->next)
12838 resolve_equivalence (eq);
12840 /* Warn about unused labels. */
12841 if (warn_unused_label)
12842 warn_unused_fortran_label (ns->st_labels);
12844 gfc_resolve_uops (ns->uop_root);
12846 gfc_current_ns = old_ns;
12850 /* Call resolve_code recursively. */
12853 resolve_codes (gfc_namespace *ns)
12856 bitmap_obstack old_obstack;
12858 for (n = ns->contained; n; n = n->sibling)
12861 gfc_current_ns = ns;
12863 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12864 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12867 /* Set to an out of range value. */
12868 current_entry_id = -1;
12870 old_obstack = labels_obstack;
12871 bitmap_obstack_initialize (&labels_obstack);
12873 resolve_code (ns->code, ns);
12875 bitmap_obstack_release (&labels_obstack);
12876 labels_obstack = old_obstack;
12880 /* This function is called after a complete program unit has been compiled.
12881 Its purpose is to examine all of the expressions associated with a program
12882 unit, assign types to all intermediate expressions, make sure that all
12883 assignments are to compatible types and figure out which names refer to
12884 which functions or subroutines. */
12887 gfc_resolve (gfc_namespace *ns)
12889 gfc_namespace *old_ns;
12890 code_stack *old_cs_base;
12896 old_ns = gfc_current_ns;
12897 old_cs_base = cs_base;
12899 resolve_types (ns);
12900 resolve_codes (ns);
12902 gfc_current_ns = old_ns;
12903 cs_base = old_cs_base;