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.class_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 || sym->attr.if_source == IFSRC_IFBODY)
1821 && gsym->type != GSYM_UNKNOWN
1823 && gsym->ns->resolved != -1
1824 && gsym->ns->proc_name
1825 && not_in_recursive (sym, gsym->ns)
1826 && not_entry_self_reference (sym, gsym->ns))
1828 gfc_symbol *def_sym;
1830 /* Resolve the gsymbol namespace if needed. */
1831 if (!gsym->ns->resolved)
1833 gfc_dt_list *old_dt_list;
1835 /* Stash away derived types so that the backend_decls do not
1837 old_dt_list = gfc_derived_types;
1838 gfc_derived_types = NULL;
1840 gfc_resolve (gsym->ns);
1842 /* Store the new derived types with the global namespace. */
1843 if (gfc_derived_types)
1844 gsym->ns->derived_types = gfc_derived_types;
1846 /* Restore the derived types of this namespace. */
1847 gfc_derived_types = old_dt_list;
1850 /* Make sure that translation for the gsymbol occurs before
1851 the procedure currently being resolved. */
1852 ns = gfc_global_ns_list;
1853 for (; ns && ns != gsym->ns; ns = ns->sibling)
1855 if (ns->sibling == gsym->ns)
1857 ns->sibling = gsym->ns->sibling;
1858 gsym->ns->sibling = gfc_global_ns_list;
1859 gfc_global_ns_list = gsym->ns;
1864 def_sym = gsym->ns->proc_name;
1865 if (def_sym->attr.entry_master)
1867 gfc_entry_list *entry;
1868 for (entry = gsym->ns->entries; entry; entry = entry->next)
1869 if (strcmp (entry->sym->name, sym->name) == 0)
1871 def_sym = entry->sym;
1876 /* Differences in constant character lengths. */
1877 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
1879 long int l1 = 0, l2 = 0;
1880 gfc_charlen *cl1 = sym->ts.u.cl;
1881 gfc_charlen *cl2 = def_sym->ts.u.cl;
1884 && cl1->length != NULL
1885 && cl1->length->expr_type == EXPR_CONSTANT)
1886 l1 = mpz_get_si (cl1->length->value.integer);
1889 && cl2->length != NULL
1890 && cl2->length->expr_type == EXPR_CONSTANT)
1891 l2 = mpz_get_si (cl2->length->value.integer);
1893 if (l1 && l2 && l1 != l2)
1894 gfc_error ("Character length mismatch in return type of "
1895 "function '%s' at %L (%ld/%ld)", sym->name,
1896 &sym->declared_at, l1, l2);
1899 /* Type mismatch of function return type and expected type. */
1900 if (sym->attr.function
1901 && !gfc_compare_types (&sym->ts, &def_sym->ts))
1902 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
1903 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
1904 gfc_typename (&def_sym->ts));
1906 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
1908 gfc_formal_arglist *arg = def_sym->formal;
1909 for ( ; arg; arg = arg->next)
1912 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
1913 else if (arg->sym->attr.allocatable
1914 || arg->sym->attr.asynchronous
1915 || arg->sym->attr.optional
1916 || arg->sym->attr.pointer
1917 || arg->sym->attr.target
1918 || arg->sym->attr.value
1919 || arg->sym->attr.volatile_)
1921 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
1922 "has an attribute that requires an explicit "
1923 "interface for this procedure", arg->sym->name,
1924 sym->name, &sym->declared_at);
1927 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
1928 else if (arg->sym && arg->sym->as
1929 && arg->sym->as->type == AS_ASSUMED_SHAPE)
1931 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
1932 "argument '%s' must have an explicit interface",
1933 sym->name, &sym->declared_at, arg->sym->name);
1936 /* F2008, 12.4.2.2 (2c) */
1937 else if (arg->sym->attr.codimension)
1939 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
1940 "'%s' must have an explicit interface",
1941 sym->name, &sym->declared_at, arg->sym->name);
1944 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
1945 else if (false) /* TODO: is a parametrized derived type */
1947 gfc_error ("Procedure '%s' at %L with parametrized derived "
1948 "type argument '%s' must have an explicit "
1949 "interface", sym->name, &sym->declared_at,
1953 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
1954 else if (arg->sym->ts.type == BT_CLASS)
1956 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
1957 "argument '%s' must have an explicit interface",
1958 sym->name, &sym->declared_at, arg->sym->name);
1963 if (def_sym->attr.function)
1965 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
1966 if (def_sym->as && def_sym->as->rank
1967 && (!sym->as || sym->as->rank != def_sym->as->rank))
1968 gfc_error ("The reference to function '%s' at %L either needs an "
1969 "explicit INTERFACE or the rank is incorrect", sym->name,
1972 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
1973 if ((def_sym->result->attr.pointer
1974 || def_sym->result->attr.allocatable)
1975 && (sym->attr.if_source != IFSRC_IFBODY
1976 || def_sym->result->attr.pointer
1977 != sym->result->attr.pointer
1978 || def_sym->result->attr.allocatable
1979 != sym->result->attr.allocatable))
1980 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
1981 "result must have an explicit interface", sym->name,
1984 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
1985 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
1986 && def_sym->ts.u.cl->length != NULL)
1988 gfc_charlen *cl = sym->ts.u.cl;
1990 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1991 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1993 gfc_error ("Nonconstant character-length function '%s' at %L "
1994 "must have an explicit interface", sym->name,
2000 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2001 if (def_sym->attr.elemental && !sym->attr.elemental)
2003 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2004 "interface", sym->name, &sym->declared_at);
2007 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2008 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2010 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2011 "an explicit interface", sym->name, &sym->declared_at);
2014 if (gfc_option.flag_whole_file == 1
2015 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2016 && !(gfc_option.warn_std & GFC_STD_GNU)))
2017 gfc_errors_to_warnings (1);
2019 if (sym->attr.if_source != IFSRC_IFBODY)
2020 gfc_procedure_use (def_sym, actual, where);
2022 gfc_errors_to_warnings (0);
2025 if (gsym->type == GSYM_UNKNOWN)
2028 gsym->where = *where;
2035 /************* Function resolution *************/
2037 /* Resolve a function call known to be generic.
2038 Section 14.1.2.4.1. */
2041 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2045 if (sym->attr.generic)
2047 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2050 expr->value.function.name = s->name;
2051 expr->value.function.esym = s;
2053 if (s->ts.type != BT_UNKNOWN)
2055 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2056 expr->ts = s->result->ts;
2059 expr->rank = s->as->rank;
2060 else if (s->result != NULL && s->result->as != NULL)
2061 expr->rank = s->result->as->rank;
2063 gfc_set_sym_referenced (expr->value.function.esym);
2068 /* TODO: Need to search for elemental references in generic
2072 if (sym->attr.intrinsic)
2073 return gfc_intrinsic_func_interface (expr, 0);
2080 resolve_generic_f (gfc_expr *expr)
2085 sym = expr->symtree->n.sym;
2089 m = resolve_generic_f0 (expr, sym);
2092 else if (m == MATCH_ERROR)
2096 if (sym->ns->parent == NULL)
2098 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2102 if (!generic_sym (sym))
2106 /* Last ditch attempt. See if the reference is to an intrinsic
2107 that possesses a matching interface. 14.1.2.4 */
2108 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2110 gfc_error ("There is no specific function for the generic '%s' at %L",
2111 expr->symtree->n.sym->name, &expr->where);
2115 m = gfc_intrinsic_func_interface (expr, 0);
2119 gfc_error ("Generic function '%s' at %L is not consistent with a "
2120 "specific intrinsic interface", expr->symtree->n.sym->name,
2127 /* Resolve a function call known to be specific. */
2130 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2134 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2136 if (sym->attr.dummy)
2138 sym->attr.proc = PROC_DUMMY;
2142 sym->attr.proc = PROC_EXTERNAL;
2146 if (sym->attr.proc == PROC_MODULE
2147 || sym->attr.proc == PROC_ST_FUNCTION
2148 || sym->attr.proc == PROC_INTERNAL)
2151 if (sym->attr.intrinsic)
2153 m = gfc_intrinsic_func_interface (expr, 1);
2157 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2158 "with an intrinsic", sym->name, &expr->where);
2166 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2169 expr->ts = sym->result->ts;
2172 expr->value.function.name = sym->name;
2173 expr->value.function.esym = sym;
2174 if (sym->as != NULL)
2175 expr->rank = sym->as->rank;
2182 resolve_specific_f (gfc_expr *expr)
2187 sym = expr->symtree->n.sym;
2191 m = resolve_specific_f0 (sym, expr);
2194 if (m == MATCH_ERROR)
2197 if (sym->ns->parent == NULL)
2200 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2206 gfc_error ("Unable to resolve the specific function '%s' at %L",
2207 expr->symtree->n.sym->name, &expr->where);
2213 /* Resolve a procedure call not known to be generic nor specific. */
2216 resolve_unknown_f (gfc_expr *expr)
2221 sym = expr->symtree->n.sym;
2223 if (sym->attr.dummy)
2225 sym->attr.proc = PROC_DUMMY;
2226 expr->value.function.name = sym->name;
2230 /* See if we have an intrinsic function reference. */
2232 if (gfc_is_intrinsic (sym, 0, expr->where))
2234 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2239 /* The reference is to an external name. */
2241 sym->attr.proc = PROC_EXTERNAL;
2242 expr->value.function.name = sym->name;
2243 expr->value.function.esym = expr->symtree->n.sym;
2245 if (sym->as != NULL)
2246 expr->rank = sym->as->rank;
2248 /* Type of the expression is either the type of the symbol or the
2249 default type of the symbol. */
2252 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2254 if (sym->ts.type != BT_UNKNOWN)
2258 ts = gfc_get_default_type (sym->name, sym->ns);
2260 if (ts->type == BT_UNKNOWN)
2262 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2263 sym->name, &expr->where);
2274 /* Return true, if the symbol is an external procedure. */
2276 is_external_proc (gfc_symbol *sym)
2278 if (!sym->attr.dummy && !sym->attr.contained
2279 && !(sym->attr.intrinsic
2280 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2281 && sym->attr.proc != PROC_ST_FUNCTION
2282 && !sym->attr.proc_pointer
2283 && !sym->attr.use_assoc
2291 /* Figure out if a function reference is pure or not. Also set the name
2292 of the function for a potential error message. Return nonzero if the
2293 function is PURE, zero if not. */
2295 pure_stmt_function (gfc_expr *, gfc_symbol *);
2298 pure_function (gfc_expr *e, const char **name)
2304 if (e->symtree != NULL
2305 && e->symtree->n.sym != NULL
2306 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2307 return pure_stmt_function (e, e->symtree->n.sym);
2309 if (e->value.function.esym)
2311 pure = gfc_pure (e->value.function.esym);
2312 *name = e->value.function.esym->name;
2314 else if (e->value.function.isym)
2316 pure = e->value.function.isym->pure
2317 || e->value.function.isym->elemental;
2318 *name = e->value.function.isym->name;
2322 /* Implicit functions are not pure. */
2324 *name = e->value.function.name;
2332 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2333 int *f ATTRIBUTE_UNUSED)
2337 /* Don't bother recursing into other statement functions
2338 since they will be checked individually for purity. */
2339 if (e->expr_type != EXPR_FUNCTION
2341 || e->symtree->n.sym == sym
2342 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2345 return pure_function (e, &name) ? false : true;
2350 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2352 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2357 is_scalar_expr_ptr (gfc_expr *expr)
2359 gfc_try retval = SUCCESS;
2364 /* See if we have a gfc_ref, which means we have a substring, array
2365 reference, or a component. */
2366 if (expr->ref != NULL)
2369 while (ref->next != NULL)
2375 if (ref->u.ss.length != NULL
2376 && ref->u.ss.length->length != NULL
2378 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2380 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2382 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2383 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2384 if (end - start + 1 != 1)
2391 if (ref->u.ar.type == AR_ELEMENT)
2393 else if (ref->u.ar.type == AR_FULL)
2395 /* The user can give a full array if the array is of size 1. */
2396 if (ref->u.ar.as != NULL
2397 && ref->u.ar.as->rank == 1
2398 && ref->u.ar.as->type == AS_EXPLICIT
2399 && ref->u.ar.as->lower[0] != NULL
2400 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2401 && ref->u.ar.as->upper[0] != NULL
2402 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2404 /* If we have a character string, we need to check if
2405 its length is one. */
2406 if (expr->ts.type == BT_CHARACTER)
2408 if (expr->ts.u.cl == NULL
2409 || expr->ts.u.cl->length == NULL
2410 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2416 /* We have constant lower and upper bounds. If the
2417 difference between is 1, it can be considered a
2419 start = (int) mpz_get_si
2420 (ref->u.ar.as->lower[0]->value.integer);
2421 end = (int) mpz_get_si
2422 (ref->u.ar.as->upper[0]->value.integer);
2423 if (end - start + 1 != 1)
2438 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2440 /* Character string. Make sure it's of length 1. */
2441 if (expr->ts.u.cl == NULL
2442 || expr->ts.u.cl->length == NULL
2443 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2446 else if (expr->rank != 0)
2453 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2454 and, in the case of c_associated, set the binding label based on
2458 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2459 gfc_symbol **new_sym)
2461 char name[GFC_MAX_SYMBOL_LEN + 1];
2462 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2463 int optional_arg = 0;
2464 gfc_try retval = SUCCESS;
2465 gfc_symbol *args_sym;
2466 gfc_typespec *arg_ts;
2467 symbol_attribute arg_attr;
2469 if (args->expr->expr_type == EXPR_CONSTANT
2470 || args->expr->expr_type == EXPR_OP
2471 || args->expr->expr_type == EXPR_NULL)
2473 gfc_error ("Argument to '%s' at %L is not a variable",
2474 sym->name, &(args->expr->where));
2478 args_sym = args->expr->symtree->n.sym;
2480 /* The typespec for the actual arg should be that stored in the expr
2481 and not necessarily that of the expr symbol (args_sym), because
2482 the actual expression could be a part-ref of the expr symbol. */
2483 arg_ts = &(args->expr->ts);
2484 arg_attr = gfc_expr_attr (args->expr);
2486 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2488 /* If the user gave two args then they are providing something for
2489 the optional arg (the second cptr). Therefore, set the name and
2490 binding label to the c_associated for two cptrs. Otherwise,
2491 set c_associated to expect one cptr. */
2495 sprintf (name, "%s_2", sym->name);
2496 sprintf (binding_label, "%s_2", sym->binding_label);
2502 sprintf (name, "%s_1", sym->name);
2503 sprintf (binding_label, "%s_1", sym->binding_label);
2507 /* Get a new symbol for the version of c_associated that
2509 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2511 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2512 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2514 sprintf (name, "%s", sym->name);
2515 sprintf (binding_label, "%s", sym->binding_label);
2517 /* Error check the call. */
2518 if (args->next != NULL)
2520 gfc_error_now ("More actual than formal arguments in '%s' "
2521 "call at %L", name, &(args->expr->where));
2524 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2526 /* Make sure we have either the target or pointer attribute. */
2527 if (!arg_attr.target && !arg_attr.pointer)
2529 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2530 "a TARGET or an associated pointer",
2532 sym->name, &(args->expr->where));
2536 /* See if we have interoperable type and type param. */
2537 if (verify_c_interop (arg_ts) == SUCCESS
2538 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2540 if (args_sym->attr.target == 1)
2542 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2543 has the target attribute and is interoperable. */
2544 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2545 allocatable variable that has the TARGET attribute and
2546 is not an array of zero size. */
2547 if (args_sym->attr.allocatable == 1)
2549 if (args_sym->attr.dimension != 0
2550 && (args_sym->as && args_sym->as->rank == 0))
2552 gfc_error_now ("Allocatable variable '%s' used as a "
2553 "parameter to '%s' at %L must not be "
2554 "an array of zero size",
2555 args_sym->name, sym->name,
2556 &(args->expr->where));
2562 /* A non-allocatable target variable with C
2563 interoperable type and type parameters must be
2565 if (args_sym && args_sym->attr.dimension)
2567 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2569 gfc_error ("Assumed-shape array '%s' at %L "
2570 "cannot be an argument to the "
2571 "procedure '%s' because "
2572 "it is not C interoperable",
2574 &(args->expr->where), sym->name);
2577 else if (args_sym->as->type == AS_DEFERRED)
2579 gfc_error ("Deferred-shape array '%s' at %L "
2580 "cannot be an argument to the "
2581 "procedure '%s' because "
2582 "it is not C interoperable",
2584 &(args->expr->where), sym->name);
2589 /* Make sure it's not a character string. Arrays of
2590 any type should be ok if the variable is of a C
2591 interoperable type. */
2592 if (arg_ts->type == BT_CHARACTER)
2593 if (arg_ts->u.cl != NULL
2594 && (arg_ts->u.cl->length == NULL
2595 || arg_ts->u.cl->length->expr_type
2598 (arg_ts->u.cl->length->value.integer, 1)
2600 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2602 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2603 "at %L must have a length of 1",
2604 args_sym->name, sym->name,
2605 &(args->expr->where));
2610 else if (arg_attr.pointer
2611 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2613 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2615 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2616 "associated scalar POINTER", args_sym->name,
2617 sym->name, &(args->expr->where));
2623 /* The parameter is not required to be C interoperable. If it
2624 is not C interoperable, it must be a nonpolymorphic scalar
2625 with no length type parameters. It still must have either
2626 the pointer or target attribute, and it can be
2627 allocatable (but must be allocated when c_loc is called). */
2628 if (args->expr->rank != 0
2629 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2631 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2632 "scalar", args_sym->name, sym->name,
2633 &(args->expr->where));
2636 else if (arg_ts->type == BT_CHARACTER
2637 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2639 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2640 "%L must have a length of 1",
2641 args_sym->name, sym->name,
2642 &(args->expr->where));
2645 else if (arg_ts->type == BT_CLASS)
2647 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2648 "polymorphic", args_sym->name, sym->name,
2649 &(args->expr->where));
2654 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2656 if (args_sym->attr.flavor != FL_PROCEDURE)
2658 /* TODO: Update this error message to allow for procedure
2659 pointers once they are implemented. */
2660 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2662 args_sym->name, sym->name,
2663 &(args->expr->where));
2666 else if (args_sym->attr.is_bind_c != 1)
2668 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2670 args_sym->name, sym->name,
2671 &(args->expr->where));
2676 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2681 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2682 "iso_c_binding function: '%s'!\n", sym->name);
2689 /* Resolve a function call, which means resolving the arguments, then figuring
2690 out which entity the name refers to. */
2691 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2692 to INTENT(OUT) or INTENT(INOUT). */
2695 resolve_function (gfc_expr *expr)
2697 gfc_actual_arglist *arg;
2702 procedure_type p = PROC_INTRINSIC;
2703 bool no_formal_args;
2707 sym = expr->symtree->n.sym;
2709 /* If this is a procedure pointer component, it has already been resolved. */
2710 if (gfc_is_proc_ptr_comp (expr, NULL))
2713 if (sym && sym->attr.intrinsic
2714 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2717 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2719 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2723 /* If this ia a deferred TBP with an abstract interface (which may
2724 of course be referenced), expr->value.function.esym will be set. */
2725 if (sym && sym->attr.abstract && !expr->value.function.esym)
2727 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2728 sym->name, &expr->where);
2732 /* Switch off assumed size checking and do this again for certain kinds
2733 of procedure, once the procedure itself is resolved. */
2734 need_full_assumed_size++;
2736 if (expr->symtree && expr->symtree->n.sym)
2737 p = expr->symtree->n.sym->attr.proc;
2739 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2740 inquiry_argument = true;
2741 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2743 if (resolve_actual_arglist (expr->value.function.actual,
2744 p, no_formal_args) == FAILURE)
2746 inquiry_argument = false;
2750 inquiry_argument = false;
2752 /* Need to setup the call to the correct c_associated, depending on
2753 the number of cptrs to user gives to compare. */
2754 if (sym && sym->attr.is_iso_c == 1)
2756 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2760 /* Get the symtree for the new symbol (resolved func).
2761 the old one will be freed later, when it's no longer used. */
2762 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2765 /* Resume assumed_size checking. */
2766 need_full_assumed_size--;
2768 /* If the procedure is external, check for usage. */
2769 if (sym && is_external_proc (sym))
2770 resolve_global_procedure (sym, &expr->where,
2771 &expr->value.function.actual, 0);
2773 if (sym && sym->ts.type == BT_CHARACTER
2775 && sym->ts.u.cl->length == NULL
2777 && expr->value.function.esym == NULL
2778 && !sym->attr.contained)
2780 /* Internal procedures are taken care of in resolve_contained_fntype. */
2781 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2782 "be used at %L since it is not a dummy argument",
2783 sym->name, &expr->where);
2787 /* See if function is already resolved. */
2789 if (expr->value.function.name != NULL)
2791 if (expr->ts.type == BT_UNKNOWN)
2797 /* Apply the rules of section 14.1.2. */
2799 switch (procedure_kind (sym))
2802 t = resolve_generic_f (expr);
2805 case PTYPE_SPECIFIC:
2806 t = resolve_specific_f (expr);
2810 t = resolve_unknown_f (expr);
2814 gfc_internal_error ("resolve_function(): bad function type");
2818 /* If the expression is still a function (it might have simplified),
2819 then we check to see if we are calling an elemental function. */
2821 if (expr->expr_type != EXPR_FUNCTION)
2824 temp = need_full_assumed_size;
2825 need_full_assumed_size = 0;
2827 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2830 if (omp_workshare_flag
2831 && expr->value.function.esym
2832 && ! gfc_elemental (expr->value.function.esym))
2834 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2835 "in WORKSHARE construct", expr->value.function.esym->name,
2840 #define GENERIC_ID expr->value.function.isym->id
2841 else if (expr->value.function.actual != NULL
2842 && expr->value.function.isym != NULL
2843 && GENERIC_ID != GFC_ISYM_LBOUND
2844 && GENERIC_ID != GFC_ISYM_LEN
2845 && GENERIC_ID != GFC_ISYM_LOC
2846 && GENERIC_ID != GFC_ISYM_PRESENT)
2848 /* Array intrinsics must also have the last upper bound of an
2849 assumed size array argument. UBOUND and SIZE have to be
2850 excluded from the check if the second argument is anything
2853 for (arg = expr->value.function.actual; arg; arg = arg->next)
2855 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2856 && arg->next != NULL && arg->next->expr)
2858 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2861 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2864 if ((int)mpz_get_si (arg->next->expr->value.integer)
2869 if (arg->expr != NULL
2870 && arg->expr->rank > 0
2871 && resolve_assumed_size_actual (arg->expr))
2877 need_full_assumed_size = temp;
2880 if (!pure_function (expr, &name) && name)
2884 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2885 "FORALL %s", name, &expr->where,
2886 forall_flag == 2 ? "mask" : "block");
2889 else if (gfc_pure (NULL))
2891 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2892 "procedure within a PURE procedure", name, &expr->where);
2897 /* Functions without the RECURSIVE attribution are not allowed to
2898 * call themselves. */
2899 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2902 esym = expr->value.function.esym;
2904 if (is_illegal_recursion (esym, gfc_current_ns))
2906 if (esym->attr.entry && esym->ns->entries)
2907 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2908 " function '%s' is not RECURSIVE",
2909 esym->name, &expr->where, esym->ns->entries->sym->name);
2911 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2912 " is not RECURSIVE", esym->name, &expr->where);
2918 /* Character lengths of use associated functions may contains references to
2919 symbols not referenced from the current program unit otherwise. Make sure
2920 those symbols are marked as referenced. */
2922 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2923 && expr->value.function.esym->attr.use_assoc)
2925 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2929 && !((expr->value.function.esym
2930 && expr->value.function.esym->attr.elemental)
2932 (expr->value.function.isym
2933 && expr->value.function.isym->elemental)))
2934 find_noncopying_intrinsics (expr->value.function.esym,
2935 expr->value.function.actual);
2937 /* Make sure that the expression has a typespec that works. */
2938 if (expr->ts.type == BT_UNKNOWN)
2940 if (expr->symtree->n.sym->result
2941 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2942 && !expr->symtree->n.sym->result->attr.proc_pointer)
2943 expr->ts = expr->symtree->n.sym->result->ts;
2950 /************* Subroutine resolution *************/
2953 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2959 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2960 sym->name, &c->loc);
2961 else if (gfc_pure (NULL))
2962 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2968 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2972 if (sym->attr.generic)
2974 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2977 c->resolved_sym = s;
2978 pure_subroutine (c, s);
2982 /* TODO: Need to search for elemental references in generic interface. */
2985 if (sym->attr.intrinsic)
2986 return gfc_intrinsic_sub_interface (c, 0);
2993 resolve_generic_s (gfc_code *c)
2998 sym = c->symtree->n.sym;
3002 m = resolve_generic_s0 (c, sym);
3005 else if (m == MATCH_ERROR)
3009 if (sym->ns->parent == NULL)
3011 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3015 if (!generic_sym (sym))
3019 /* Last ditch attempt. See if the reference is to an intrinsic
3020 that possesses a matching interface. 14.1.2.4 */
3021 sym = c->symtree->n.sym;
3023 if (!gfc_is_intrinsic (sym, 1, c->loc))
3025 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3026 sym->name, &c->loc);
3030 m = gfc_intrinsic_sub_interface (c, 0);
3034 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3035 "intrinsic subroutine interface", sym->name, &c->loc);
3041 /* Set the name and binding label of the subroutine symbol in the call
3042 expression represented by 'c' to include the type and kind of the
3043 second parameter. This function is for resolving the appropriate
3044 version of c_f_pointer() and c_f_procpointer(). For example, a
3045 call to c_f_pointer() for a default integer pointer could have a
3046 name of c_f_pointer_i4. If no second arg exists, which is an error
3047 for these two functions, it defaults to the generic symbol's name
3048 and binding label. */
3051 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3052 char *name, char *binding_label)
3054 gfc_expr *arg = NULL;
3058 /* The second arg of c_f_pointer and c_f_procpointer determines
3059 the type and kind for the procedure name. */
3060 arg = c->ext.actual->next->expr;
3064 /* Set up the name to have the given symbol's name,
3065 plus the type and kind. */
3066 /* a derived type is marked with the type letter 'u' */
3067 if (arg->ts.type == BT_DERIVED)
3070 kind = 0; /* set the kind as 0 for now */
3074 type = gfc_type_letter (arg->ts.type);
3075 kind = arg->ts.kind;
3078 if (arg->ts.type == BT_CHARACTER)
3079 /* Kind info for character strings not needed. */
3082 sprintf (name, "%s_%c%d", sym->name, type, kind);
3083 /* Set up the binding label as the given symbol's label plus
3084 the type and kind. */
3085 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3089 /* If the second arg is missing, set the name and label as
3090 was, cause it should at least be found, and the missing
3091 arg error will be caught by compare_parameters(). */
3092 sprintf (name, "%s", sym->name);
3093 sprintf (binding_label, "%s", sym->binding_label);
3100 /* Resolve a generic version of the iso_c_binding procedure given
3101 (sym) to the specific one based on the type and kind of the
3102 argument(s). Currently, this function resolves c_f_pointer() and
3103 c_f_procpointer based on the type and kind of the second argument
3104 (FPTR). Other iso_c_binding procedures aren't specially handled.
3105 Upon successfully exiting, c->resolved_sym will hold the resolved
3106 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3110 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3112 gfc_symbol *new_sym;
3113 /* this is fine, since we know the names won't use the max */
3114 char name[GFC_MAX_SYMBOL_LEN + 1];
3115 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3116 /* default to success; will override if find error */
3117 match m = MATCH_YES;
3119 /* Make sure the actual arguments are in the necessary order (based on the
3120 formal args) before resolving. */
3121 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3123 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3124 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3126 set_name_and_label (c, sym, name, binding_label);
3128 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3130 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3132 /* Make sure we got a third arg if the second arg has non-zero
3133 rank. We must also check that the type and rank are
3134 correct since we short-circuit this check in
3135 gfc_procedure_use() (called above to sort actual args). */
3136 if (c->ext.actual->next->expr->rank != 0)
3138 if(c->ext.actual->next->next == NULL
3139 || c->ext.actual->next->next->expr == NULL)
3142 gfc_error ("Missing SHAPE parameter for call to %s "
3143 "at %L", sym->name, &(c->loc));
3145 else if (c->ext.actual->next->next->expr->ts.type
3147 || c->ext.actual->next->next->expr->rank != 1)
3150 gfc_error ("SHAPE parameter for call to %s at %L must "
3151 "be a rank 1 INTEGER array", sym->name,
3158 if (m != MATCH_ERROR)
3160 /* the 1 means to add the optional arg to formal list */
3161 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3163 /* for error reporting, say it's declared where the original was */
3164 new_sym->declared_at = sym->declared_at;
3169 /* no differences for c_loc or c_funloc */
3173 /* set the resolved symbol */
3174 if (m != MATCH_ERROR)
3175 c->resolved_sym = new_sym;
3177 c->resolved_sym = sym;
3183 /* Resolve a subroutine call known to be specific. */
3186 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3190 if(sym->attr.is_iso_c)
3192 m = gfc_iso_c_sub_interface (c,sym);
3196 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3198 if (sym->attr.dummy)
3200 sym->attr.proc = PROC_DUMMY;
3204 sym->attr.proc = PROC_EXTERNAL;
3208 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3211 if (sym->attr.intrinsic)
3213 m = gfc_intrinsic_sub_interface (c, 1);
3217 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3218 "with an intrinsic", sym->name, &c->loc);
3226 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3228 c->resolved_sym = sym;
3229 pure_subroutine (c, sym);
3236 resolve_specific_s (gfc_code *c)
3241 sym = c->symtree->n.sym;
3245 m = resolve_specific_s0 (c, sym);
3248 if (m == MATCH_ERROR)
3251 if (sym->ns->parent == NULL)
3254 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3260 sym = c->symtree->n.sym;
3261 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3262 sym->name, &c->loc);
3268 /* Resolve a subroutine call not known to be generic nor specific. */
3271 resolve_unknown_s (gfc_code *c)
3275 sym = c->symtree->n.sym;
3277 if (sym->attr.dummy)
3279 sym->attr.proc = PROC_DUMMY;
3283 /* See if we have an intrinsic function reference. */
3285 if (gfc_is_intrinsic (sym, 1, c->loc))
3287 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3292 /* The reference is to an external name. */
3295 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3297 c->resolved_sym = sym;
3299 pure_subroutine (c, sym);
3305 /* Resolve a subroutine call. Although it was tempting to use the same code
3306 for functions, subroutines and functions are stored differently and this
3307 makes things awkward. */
3310 resolve_call (gfc_code *c)
3313 procedure_type ptype = PROC_INTRINSIC;
3314 gfc_symbol *csym, *sym;
3315 bool no_formal_args;
3317 csym = c->symtree ? c->symtree->n.sym : NULL;
3319 if (csym && csym->ts.type != BT_UNKNOWN)
3321 gfc_error ("'%s' at %L has a type, which is not consistent with "
3322 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3326 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3329 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3330 sym = st ? st->n.sym : NULL;
3331 if (sym && csym != sym
3332 && sym->ns == gfc_current_ns
3333 && sym->attr.flavor == FL_PROCEDURE
3334 && sym->attr.contained)
3337 if (csym->attr.generic)
3338 c->symtree->n.sym = sym;
3341 csym = c->symtree->n.sym;
3345 /* If this ia a deferred TBP with an abstract interface
3346 (which may of course be referenced), c->expr1 will be set. */
3347 if (csym && csym->attr.abstract && !c->expr1)
3349 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3350 csym->name, &c->loc);
3354 /* Subroutines without the RECURSIVE attribution are not allowed to
3355 * call themselves. */
3356 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3358 if (csym->attr.entry && csym->ns->entries)
3359 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3360 " subroutine '%s' is not RECURSIVE",
3361 csym->name, &c->loc, csym->ns->entries->sym->name);
3363 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3364 " is not RECURSIVE", csym->name, &c->loc);
3369 /* Switch off assumed size checking and do this again for certain kinds
3370 of procedure, once the procedure itself is resolved. */
3371 need_full_assumed_size++;
3374 ptype = csym->attr.proc;
3376 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3377 if (resolve_actual_arglist (c->ext.actual, ptype,
3378 no_formal_args) == FAILURE)
3381 /* Resume assumed_size checking. */
3382 need_full_assumed_size--;
3384 /* If external, check for usage. */
3385 if (csym && is_external_proc (csym))
3386 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3389 if (c->resolved_sym == NULL)
3391 c->resolved_isym = NULL;
3392 switch (procedure_kind (csym))
3395 t = resolve_generic_s (c);
3398 case PTYPE_SPECIFIC:
3399 t = resolve_specific_s (c);
3403 t = resolve_unknown_s (c);
3407 gfc_internal_error ("resolve_subroutine(): bad function type");
3411 /* Some checks of elemental subroutine actual arguments. */
3412 if (resolve_elemental_actual (NULL, c) == FAILURE)
3415 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3416 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3421 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3422 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3423 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3424 if their shapes do not match. If either op1->shape or op2->shape is
3425 NULL, return SUCCESS. */
3428 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3435 if (op1->shape != NULL && op2->shape != NULL)
3437 for (i = 0; i < op1->rank; i++)
3439 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3441 gfc_error ("Shapes for operands at %L and %L are not conformable",
3442 &op1->where, &op2->where);
3453 /* Resolve an operator expression node. This can involve replacing the
3454 operation with a user defined function call. */
3457 resolve_operator (gfc_expr *e)
3459 gfc_expr *op1, *op2;
3461 bool dual_locus_error;
3464 /* Resolve all subnodes-- give them types. */
3466 switch (e->value.op.op)
3469 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3472 /* Fall through... */
3475 case INTRINSIC_UPLUS:
3476 case INTRINSIC_UMINUS:
3477 case INTRINSIC_PARENTHESES:
3478 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3483 /* Typecheck the new node. */
3485 op1 = e->value.op.op1;
3486 op2 = e->value.op.op2;
3487 dual_locus_error = false;
3489 if ((op1 && op1->expr_type == EXPR_NULL)
3490 || (op2 && op2->expr_type == EXPR_NULL))
3492 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3496 switch (e->value.op.op)
3498 case INTRINSIC_UPLUS:
3499 case INTRINSIC_UMINUS:
3500 if (op1->ts.type == BT_INTEGER
3501 || op1->ts.type == BT_REAL
3502 || op1->ts.type == BT_COMPLEX)
3508 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3509 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3512 case INTRINSIC_PLUS:
3513 case INTRINSIC_MINUS:
3514 case INTRINSIC_TIMES:
3515 case INTRINSIC_DIVIDE:
3516 case INTRINSIC_POWER:
3517 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3519 gfc_type_convert_binary (e, 1);
3524 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3525 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3526 gfc_typename (&op2->ts));
3529 case INTRINSIC_CONCAT:
3530 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3531 && op1->ts.kind == op2->ts.kind)
3533 e->ts.type = BT_CHARACTER;
3534 e->ts.kind = op1->ts.kind;
3539 _("Operands of string concatenation operator at %%L are %s/%s"),
3540 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3546 case INTRINSIC_NEQV:
3547 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3549 e->ts.type = BT_LOGICAL;
3550 e->ts.kind = gfc_kind_max (op1, op2);
3551 if (op1->ts.kind < e->ts.kind)
3552 gfc_convert_type (op1, &e->ts, 2);
3553 else if (op2->ts.kind < e->ts.kind)
3554 gfc_convert_type (op2, &e->ts, 2);
3558 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3559 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3560 gfc_typename (&op2->ts));
3565 if (op1->ts.type == BT_LOGICAL)
3567 e->ts.type = BT_LOGICAL;
3568 e->ts.kind = op1->ts.kind;
3572 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3573 gfc_typename (&op1->ts));
3577 case INTRINSIC_GT_OS:
3579 case INTRINSIC_GE_OS:
3581 case INTRINSIC_LT_OS:
3583 case INTRINSIC_LE_OS:
3584 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3586 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3590 /* Fall through... */
3593 case INTRINSIC_EQ_OS:
3595 case INTRINSIC_NE_OS:
3596 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3597 && op1->ts.kind == op2->ts.kind)
3599 e->ts.type = BT_LOGICAL;
3600 e->ts.kind = gfc_default_logical_kind;
3604 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3606 gfc_type_convert_binary (e, 1);
3608 e->ts.type = BT_LOGICAL;
3609 e->ts.kind = gfc_default_logical_kind;
3613 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3615 _("Logicals at %%L must be compared with %s instead of %s"),
3616 (e->value.op.op == INTRINSIC_EQ
3617 || e->value.op.op == INTRINSIC_EQ_OS)
3618 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3621 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3622 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3623 gfc_typename (&op2->ts));
3627 case INTRINSIC_USER:
3628 if (e->value.op.uop->op == NULL)
3629 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3630 else if (op2 == NULL)
3631 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3632 e->value.op.uop->name, gfc_typename (&op1->ts));
3634 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3635 e->value.op.uop->name, gfc_typename (&op1->ts),
3636 gfc_typename (&op2->ts));
3640 case INTRINSIC_PARENTHESES:
3642 if (e->ts.type == BT_CHARACTER)
3643 e->ts.u.cl = op1->ts.u.cl;
3647 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3650 /* Deal with arrayness of an operand through an operator. */
3654 switch (e->value.op.op)
3656 case INTRINSIC_PLUS:
3657 case INTRINSIC_MINUS:
3658 case INTRINSIC_TIMES:
3659 case INTRINSIC_DIVIDE:
3660 case INTRINSIC_POWER:
3661 case INTRINSIC_CONCAT:
3665 case INTRINSIC_NEQV:
3667 case INTRINSIC_EQ_OS:
3669 case INTRINSIC_NE_OS:
3671 case INTRINSIC_GT_OS:
3673 case INTRINSIC_GE_OS:
3675 case INTRINSIC_LT_OS:
3677 case INTRINSIC_LE_OS:
3679 if (op1->rank == 0 && op2->rank == 0)
3682 if (op1->rank == 0 && op2->rank != 0)
3684 e->rank = op2->rank;
3686 if (e->shape == NULL)
3687 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3690 if (op1->rank != 0 && op2->rank == 0)
3692 e->rank = op1->rank;
3694 if (e->shape == NULL)
3695 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3698 if (op1->rank != 0 && op2->rank != 0)
3700 if (op1->rank == op2->rank)
3702 e->rank = op1->rank;
3703 if (e->shape == NULL)
3705 t = compare_shapes (op1, op2);
3709 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3714 /* Allow higher level expressions to work. */
3717 /* Try user-defined operators, and otherwise throw an error. */
3718 dual_locus_error = true;
3720 _("Inconsistent ranks for operator at %%L and %%L"));
3727 case INTRINSIC_PARENTHESES:
3729 case INTRINSIC_UPLUS:
3730 case INTRINSIC_UMINUS:
3731 /* Simply copy arrayness attribute */
3732 e->rank = op1->rank;
3734 if (e->shape == NULL)
3735 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3743 /* Attempt to simplify the expression. */
3746 t = gfc_simplify_expr (e, 0);
3747 /* Some calls do not succeed in simplification and return FAILURE
3748 even though there is no error; e.g. variable references to
3749 PARAMETER arrays. */
3750 if (!gfc_is_constant_expr (e))
3759 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3766 if (dual_locus_error)
3767 gfc_error (msg, &op1->where, &op2->where);
3769 gfc_error (msg, &e->where);
3775 /************** Array resolution subroutines **************/
3778 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3781 /* Compare two integer expressions. */
3784 compare_bound (gfc_expr *a, gfc_expr *b)
3788 if (a == NULL || a->expr_type != EXPR_CONSTANT
3789 || b == NULL || b->expr_type != EXPR_CONSTANT)
3792 /* If either of the types isn't INTEGER, we must have
3793 raised an error earlier. */
3795 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3798 i = mpz_cmp (a->value.integer, b->value.integer);
3808 /* Compare an integer expression with an integer. */
3811 compare_bound_int (gfc_expr *a, int b)
3815 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3818 if (a->ts.type != BT_INTEGER)
3819 gfc_internal_error ("compare_bound_int(): Bad expression");
3821 i = mpz_cmp_si (a->value.integer, b);
3831 /* Compare an integer expression with a mpz_t. */
3834 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3838 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3841 if (a->ts.type != BT_INTEGER)
3842 gfc_internal_error ("compare_bound_int(): Bad expression");
3844 i = mpz_cmp (a->value.integer, b);
3854 /* Compute the last value of a sequence given by a triplet.
3855 Return 0 if it wasn't able to compute the last value, or if the
3856 sequence if empty, and 1 otherwise. */
3859 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3860 gfc_expr *stride, mpz_t last)
3864 if (start == NULL || start->expr_type != EXPR_CONSTANT
3865 || end == NULL || end->expr_type != EXPR_CONSTANT
3866 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3869 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3870 || (stride != NULL && stride->ts.type != BT_INTEGER))
3873 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3875 if (compare_bound (start, end) == CMP_GT)
3877 mpz_set (last, end->value.integer);
3881 if (compare_bound_int (stride, 0) == CMP_GT)
3883 /* Stride is positive */
3884 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3889 /* Stride is negative */
3890 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3895 mpz_sub (rem, end->value.integer, start->value.integer);
3896 mpz_tdiv_r (rem, rem, stride->value.integer);
3897 mpz_sub (last, end->value.integer, rem);
3904 /* Compare a single dimension of an array reference to the array
3908 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3912 if (ar->dimen_type[i] == DIMEN_STAR)
3914 gcc_assert (ar->stride[i] == NULL);
3915 /* This implies [*] as [*:] and [*:3] are not possible. */
3916 if (ar->start[i] == NULL)
3918 gcc_assert (ar->end[i] == NULL);
3923 /* Given start, end and stride values, calculate the minimum and
3924 maximum referenced indexes. */
3926 switch (ar->dimen_type[i])
3933 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3936 gfc_warning ("Array reference at %L is out of bounds "
3937 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3938 mpz_get_si (ar->start[i]->value.integer),
3939 mpz_get_si (as->lower[i]->value.integer), i+1);
3941 gfc_warning ("Array reference at %L is out of bounds "
3942 "(%ld < %ld) in codimension %d", &ar->c_where[i],
3943 mpz_get_si (ar->start[i]->value.integer),
3944 mpz_get_si (as->lower[i]->value.integer),
3948 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3951 gfc_warning ("Array reference at %L is out of bounds "
3952 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3953 mpz_get_si (ar->start[i]->value.integer),
3954 mpz_get_si (as->upper[i]->value.integer), i+1);
3956 gfc_warning ("Array reference at %L is out of bounds "
3957 "(%ld > %ld) in codimension %d", &ar->c_where[i],
3958 mpz_get_si (ar->start[i]->value.integer),
3959 mpz_get_si (as->upper[i]->value.integer),
3968 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3969 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3971 comparison comp_start_end = compare_bound (AR_START, AR_END);
3973 /* Check for zero stride, which is not allowed. */
3974 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3976 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3980 /* if start == len || (stride > 0 && start < len)
3981 || (stride < 0 && start > len),
3982 then the array section contains at least one element. In this
3983 case, there is an out-of-bounds access if
3984 (start < lower || start > upper). */
3985 if (compare_bound (AR_START, AR_END) == CMP_EQ
3986 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3987 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3988 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3989 && comp_start_end == CMP_GT))
3991 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3993 gfc_warning ("Lower array reference at %L is out of bounds "
3994 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3995 mpz_get_si (AR_START->value.integer),
3996 mpz_get_si (as->lower[i]->value.integer), i+1);
3999 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4001 gfc_warning ("Lower array reference at %L is out of bounds "
4002 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4003 mpz_get_si (AR_START->value.integer),
4004 mpz_get_si (as->upper[i]->value.integer), i+1);
4009 /* If we can compute the highest index of the array section,
4010 then it also has to be between lower and upper. */
4011 mpz_init (last_value);
4012 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4015 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4017 gfc_warning ("Upper array reference at %L is out of bounds "
4018 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4019 mpz_get_si (last_value),
4020 mpz_get_si (as->lower[i]->value.integer), i+1);
4021 mpz_clear (last_value);
4024 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4026 gfc_warning ("Upper array reference at %L is out of bounds "
4027 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4028 mpz_get_si (last_value),
4029 mpz_get_si (as->upper[i]->value.integer), i+1);
4030 mpz_clear (last_value);
4034 mpz_clear (last_value);
4042 gfc_internal_error ("check_dimension(): Bad array reference");
4049 /* Compare an array reference with an array specification. */
4052 compare_spec_to_ref (gfc_array_ref *ar)
4059 /* TODO: Full array sections are only allowed as actual parameters. */
4060 if (as->type == AS_ASSUMED_SIZE
4061 && (/*ar->type == AR_FULL
4062 ||*/ (ar->type == AR_SECTION
4063 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4065 gfc_error ("Rightmost upper bound of assumed size array section "
4066 "not specified at %L", &ar->where);
4070 if (ar->type == AR_FULL)
4073 if (as->rank != ar->dimen)
4075 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4076 &ar->where, ar->dimen, as->rank);
4080 /* ar->codimen == 0 is a local array. */
4081 if (as->corank != ar->codimen && ar->codimen != 0)
4083 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4084 &ar->where, ar->codimen, as->corank);
4088 for (i = 0; i < as->rank; i++)
4089 if (check_dimension (i, ar, as) == FAILURE)
4092 /* Local access has no coarray spec. */
4093 if (ar->codimen != 0)
4094 for (i = as->rank; i < as->rank + as->corank; i++)
4096 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate)
4098 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4099 i + 1 - as->rank, &ar->where);
4102 if (check_dimension (i, ar, as) == FAILURE)
4110 /* Resolve one part of an array index. */
4113 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4114 int force_index_integer_kind)
4121 if (gfc_resolve_expr (index) == FAILURE)
4124 if (check_scalar && index->rank != 0)
4126 gfc_error ("Array index at %L must be scalar", &index->where);
4130 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4132 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4133 &index->where, gfc_basic_typename (index->ts.type));
4137 if (index->ts.type == BT_REAL)
4138 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4139 &index->where) == FAILURE)
4142 if ((index->ts.kind != gfc_index_integer_kind
4143 && force_index_integer_kind)
4144 || index->ts.type != BT_INTEGER)
4147 ts.type = BT_INTEGER;
4148 ts.kind = gfc_index_integer_kind;
4150 gfc_convert_type_warn (index, &ts, 2, 0);
4156 /* Resolve one part of an array index. */
4159 gfc_resolve_index (gfc_expr *index, int check_scalar)
4161 return gfc_resolve_index_1 (index, check_scalar, 1);
4164 /* Resolve a dim argument to an intrinsic function. */
4167 gfc_resolve_dim_arg (gfc_expr *dim)
4172 if (gfc_resolve_expr (dim) == FAILURE)
4177 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4182 if (dim->ts.type != BT_INTEGER)
4184 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4188 if (dim->ts.kind != gfc_index_integer_kind)
4193 ts.type = BT_INTEGER;
4194 ts.kind = gfc_index_integer_kind;
4196 gfc_convert_type_warn (dim, &ts, 2, 0);
4202 /* Given an expression that contains array references, update those array
4203 references to point to the right array specifications. While this is
4204 filled in during matching, this information is difficult to save and load
4205 in a module, so we take care of it here.
4207 The idea here is that the original array reference comes from the
4208 base symbol. We traverse the list of reference structures, setting
4209 the stored reference to references. Component references can
4210 provide an additional array specification. */
4213 find_array_spec (gfc_expr *e)
4217 gfc_symbol *derived;
4220 if (e->symtree->n.sym->ts.type == BT_CLASS)
4221 as = CLASS_DATA (e->symtree->n.sym)->as;
4223 as = e->symtree->n.sym->as;
4226 for (ref = e->ref; ref; ref = ref->next)
4231 gfc_internal_error ("find_array_spec(): Missing spec");
4238 if (derived == NULL)
4239 derived = e->symtree->n.sym->ts.u.derived;
4241 if (derived->attr.is_class)
4242 derived = derived->components->ts.u.derived;
4244 c = derived->components;
4246 for (; c; c = c->next)
4247 if (c == ref->u.c.component)
4249 /* Track the sequence of component references. */
4250 if (c->ts.type == BT_DERIVED)
4251 derived = c->ts.u.derived;
4256 gfc_internal_error ("find_array_spec(): Component not found");
4258 if (c->attr.dimension)
4261 gfc_internal_error ("find_array_spec(): unused as(1)");
4272 gfc_internal_error ("find_array_spec(): unused as(2)");
4276 /* Resolve an array reference. */
4279 resolve_array_ref (gfc_array_ref *ar)
4281 int i, check_scalar;
4284 for (i = 0; i < ar->dimen + ar->codimen; i++)
4286 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4288 /* Do not force gfc_index_integer_kind for the start. We can
4289 do fine with any integer kind. This avoids temporary arrays
4290 created for indexing with a vector. */
4291 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4293 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4295 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4300 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4304 ar->dimen_type[i] = DIMEN_ELEMENT;
4308 ar->dimen_type[i] = DIMEN_VECTOR;
4309 if (e->expr_type == EXPR_VARIABLE
4310 && e->symtree->n.sym->ts.type == BT_DERIVED)
4311 ar->start[i] = gfc_get_parentheses (e);
4315 gfc_error ("Array index at %L is an array of rank %d",
4316 &ar->c_where[i], e->rank);
4321 if (ar->type == AR_FULL && ar->as->rank == 0)
4322 ar->type = AR_ELEMENT;
4324 /* If the reference type is unknown, figure out what kind it is. */
4326 if (ar->type == AR_UNKNOWN)
4328 ar->type = AR_ELEMENT;
4329 for (i = 0; i < ar->dimen; i++)
4330 if (ar->dimen_type[i] == DIMEN_RANGE
4331 || ar->dimen_type[i] == DIMEN_VECTOR)
4333 ar->type = AR_SECTION;
4338 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4346 resolve_substring (gfc_ref *ref)
4348 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4350 if (ref->u.ss.start != NULL)
4352 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4355 if (ref->u.ss.start->ts.type != BT_INTEGER)
4357 gfc_error ("Substring start index at %L must be of type INTEGER",
4358 &ref->u.ss.start->where);
4362 if (ref->u.ss.start->rank != 0)
4364 gfc_error ("Substring start index at %L must be scalar",
4365 &ref->u.ss.start->where);
4369 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4370 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4371 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4373 gfc_error ("Substring start index at %L is less than one",
4374 &ref->u.ss.start->where);
4379 if (ref->u.ss.end != NULL)
4381 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4384 if (ref->u.ss.end->ts.type != BT_INTEGER)
4386 gfc_error ("Substring end index at %L must be of type INTEGER",
4387 &ref->u.ss.end->where);
4391 if (ref->u.ss.end->rank != 0)
4393 gfc_error ("Substring end index at %L must be scalar",
4394 &ref->u.ss.end->where);
4398 if (ref->u.ss.length != NULL
4399 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4400 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4401 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4403 gfc_error ("Substring end index at %L exceeds the string length",
4404 &ref->u.ss.start->where);
4408 if (compare_bound_mpz_t (ref->u.ss.end,
4409 gfc_integer_kinds[k].huge) == CMP_GT
4410 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4411 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4413 gfc_error ("Substring end index at %L is too large",
4414 &ref->u.ss.end->where);
4423 /* This function supplies missing substring charlens. */
4426 gfc_resolve_substring_charlen (gfc_expr *e)
4429 gfc_expr *start, *end;
4431 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4432 if (char_ref->type == REF_SUBSTRING)
4438 gcc_assert (char_ref->next == NULL);
4442 if (e->ts.u.cl->length)
4443 gfc_free_expr (e->ts.u.cl->length);
4444 else if (e->expr_type == EXPR_VARIABLE
4445 && e->symtree->n.sym->attr.dummy)
4449 e->ts.type = BT_CHARACTER;
4450 e->ts.kind = gfc_default_character_kind;
4453 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4455 if (char_ref->u.ss.start)
4456 start = gfc_copy_expr (char_ref->u.ss.start);
4458 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4460 if (char_ref->u.ss.end)
4461 end = gfc_copy_expr (char_ref->u.ss.end);
4462 else if (e->expr_type == EXPR_VARIABLE)
4463 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4470 /* Length = (end - start +1). */
4471 e->ts.u.cl->length = gfc_subtract (end, start);
4472 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4473 gfc_get_int_expr (gfc_default_integer_kind,
4476 e->ts.u.cl->length->ts.type = BT_INTEGER;
4477 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4479 /* Make sure that the length is simplified. */
4480 gfc_simplify_expr (e->ts.u.cl->length, 1);
4481 gfc_resolve_expr (e->ts.u.cl->length);
4485 /* Resolve subtype references. */
4488 resolve_ref (gfc_expr *expr)
4490 int current_part_dimension, n_components, seen_part_dimension;
4493 for (ref = expr->ref; ref; ref = ref->next)
4494 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4496 find_array_spec (expr);
4500 for (ref = expr->ref; ref; ref = ref->next)
4504 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4512 resolve_substring (ref);
4516 /* Check constraints on part references. */
4518 current_part_dimension = 0;
4519 seen_part_dimension = 0;
4522 for (ref = expr->ref; ref; ref = ref->next)
4527 switch (ref->u.ar.type)
4530 /* Coarray scalar. */
4531 if (ref->u.ar.as->rank == 0)
4533 current_part_dimension = 0;
4538 current_part_dimension = 1;
4542 current_part_dimension = 0;
4546 gfc_internal_error ("resolve_ref(): Bad array reference");
4552 if (current_part_dimension || seen_part_dimension)
4555 if (ref->u.c.component->attr.pointer
4556 || ref->u.c.component->attr.proc_pointer)
4558 gfc_error ("Component to the right of a part reference "
4559 "with nonzero rank must not have the POINTER "
4560 "attribute at %L", &expr->where);
4563 else if (ref->u.c.component->attr.allocatable)
4565 gfc_error ("Component to the right of a part reference "
4566 "with nonzero rank must not have the ALLOCATABLE "
4567 "attribute at %L", &expr->where);
4579 if (((ref->type == REF_COMPONENT && n_components > 1)
4580 || ref->next == NULL)
4581 && current_part_dimension
4582 && seen_part_dimension)
4584 gfc_error ("Two or more part references with nonzero rank must "
4585 "not be specified at %L", &expr->where);
4589 if (ref->type == REF_COMPONENT)
4591 if (current_part_dimension)
4592 seen_part_dimension = 1;
4594 /* reset to make sure */
4595 current_part_dimension = 0;
4603 /* Given an expression, determine its shape. This is easier than it sounds.
4604 Leaves the shape array NULL if it is not possible to determine the shape. */
4607 expression_shape (gfc_expr *e)
4609 mpz_t array[GFC_MAX_DIMENSIONS];
4612 if (e->rank == 0 || e->shape != NULL)
4615 for (i = 0; i < e->rank; i++)
4616 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4619 e->shape = gfc_get_shape (e->rank);
4621 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4626 for (i--; i >= 0; i--)
4627 mpz_clear (array[i]);
4631 /* Given a variable expression node, compute the rank of the expression by
4632 examining the base symbol and any reference structures it may have. */
4635 expression_rank (gfc_expr *e)
4640 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4641 could lead to serious confusion... */
4642 gcc_assert (e->expr_type != EXPR_COMPCALL);
4646 if (e->expr_type == EXPR_ARRAY)
4648 /* Constructors can have a rank different from one via RESHAPE(). */
4650 if (e->symtree == NULL)
4656 e->rank = (e->symtree->n.sym->as == NULL)
4657 ? 0 : e->symtree->n.sym->as->rank;
4663 for (ref = e->ref; ref; ref = ref->next)
4665 if (ref->type != REF_ARRAY)
4668 if (ref->u.ar.type == AR_FULL)
4670 rank = ref->u.ar.as->rank;
4674 if (ref->u.ar.type == AR_SECTION)
4676 /* Figure out the rank of the section. */
4678 gfc_internal_error ("expression_rank(): Two array specs");
4680 for (i = 0; i < ref->u.ar.dimen; i++)
4681 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4682 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4692 expression_shape (e);
4696 /* Resolve a variable expression. */
4699 resolve_variable (gfc_expr *e)
4706 if (e->symtree == NULL)
4709 if (e->ref && resolve_ref (e) == FAILURE)
4712 sym = e->symtree->n.sym;
4713 if (sym->attr.flavor == FL_PROCEDURE
4714 && (!sym->attr.function
4715 || (sym->attr.function && sym->result
4716 && sym->result->attr.proc_pointer
4717 && !sym->result->attr.function)))
4719 e->ts.type = BT_PROCEDURE;
4720 goto resolve_procedure;
4723 if (sym->ts.type != BT_UNKNOWN)
4724 gfc_variable_attr (e, &e->ts);
4727 /* Must be a simple variable reference. */
4728 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4733 if (check_assumed_size_reference (sym, e))
4736 /* Deal with forward references to entries during resolve_code, to
4737 satisfy, at least partially, 12.5.2.5. */
4738 if (gfc_current_ns->entries
4739 && current_entry_id == sym->entry_id
4742 && cs_base->current->op != EXEC_ENTRY)
4744 gfc_entry_list *entry;
4745 gfc_formal_arglist *formal;
4749 /* If the symbol is a dummy... */
4750 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4752 entry = gfc_current_ns->entries;
4755 /* ...test if the symbol is a parameter of previous entries. */
4756 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4757 for (formal = entry->sym->formal; formal; formal = formal->next)
4759 if (formal->sym && sym->name == formal->sym->name)
4763 /* If it has not been seen as a dummy, this is an error. */
4766 if (specification_expr)
4767 gfc_error ("Variable '%s', used in a specification expression"
4768 ", is referenced at %L before the ENTRY statement "
4769 "in which it is a parameter",
4770 sym->name, &cs_base->current->loc);
4772 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4773 "statement in which it is a parameter",
4774 sym->name, &cs_base->current->loc);
4779 /* Now do the same check on the specification expressions. */
4780 specification_expr = 1;
4781 if (sym->ts.type == BT_CHARACTER
4782 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4786 for (n = 0; n < sym->as->rank; n++)
4788 specification_expr = 1;
4789 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4791 specification_expr = 1;
4792 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4795 specification_expr = 0;
4798 /* Update the symbol's entry level. */
4799 sym->entry_id = current_entry_id + 1;
4802 /* If a symbol has been host_associated mark it. This is used latter,
4803 to identify if aliasing is possible via host association. */
4804 if (sym->attr.flavor == FL_VARIABLE
4805 && gfc_current_ns->parent
4806 && (gfc_current_ns->parent == sym->ns
4807 || (gfc_current_ns->parent->parent
4808 && gfc_current_ns->parent->parent == sym->ns)))
4809 sym->attr.host_assoc = 1;
4812 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4815 /* F2008, C617 and C1229. */
4816 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
4817 && gfc_is_coindexed (e))
4819 gfc_ref *ref, *ref2 = NULL;
4821 if (e->ts.type == BT_CLASS)
4823 gfc_error ("Polymorphic subobject of coindexed object at %L",
4828 for (ref = e->ref; ref; ref = ref->next)
4830 if (ref->type == REF_COMPONENT)
4832 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4836 for ( ; ref; ref = ref->next)
4837 if (ref->type == REF_COMPONENT)
4840 /* Expression itself is coindexed object. */
4844 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
4845 for ( ; c; c = c->next)
4846 if (c->attr.allocatable && c->ts.type == BT_CLASS)
4848 gfc_error ("Coindexed object with polymorphic allocatable "
4849 "subcomponent at %L", &e->where);
4860 /* Checks to see that the correct symbol has been host associated.
4861 The only situation where this arises is that in which a twice
4862 contained function is parsed after the host association is made.
4863 Therefore, on detecting this, change the symbol in the expression
4864 and convert the array reference into an actual arglist if the old
4865 symbol is a variable. */
4867 check_host_association (gfc_expr *e)
4869 gfc_symbol *sym, *old_sym;
4873 gfc_actual_arglist *arg, *tail = NULL;
4874 bool retval = e->expr_type == EXPR_FUNCTION;
4876 /* If the expression is the result of substitution in
4877 interface.c(gfc_extend_expr) because there is no way in
4878 which the host association can be wrong. */
4879 if (e->symtree == NULL
4880 || e->symtree->n.sym == NULL
4881 || e->user_operator)
4884 old_sym = e->symtree->n.sym;
4886 if (gfc_current_ns->parent
4887 && old_sym->ns != gfc_current_ns)
4889 /* Use the 'USE' name so that renamed module symbols are
4890 correctly handled. */
4891 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4893 if (sym && old_sym != sym
4894 && sym->ts.type == old_sym->ts.type
4895 && sym->attr.flavor == FL_PROCEDURE
4896 && sym->attr.contained)
4898 /* Clear the shape, since it might not be valid. */
4899 if (e->shape != NULL)
4901 for (n = 0; n < e->rank; n++)
4902 mpz_clear (e->shape[n]);
4904 gfc_free (e->shape);
4907 /* Give the expression the right symtree! */
4908 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4909 gcc_assert (st != NULL);
4911 if (old_sym->attr.flavor == FL_PROCEDURE
4912 || e->expr_type == EXPR_FUNCTION)
4914 /* Original was function so point to the new symbol, since
4915 the actual argument list is already attached to the
4917 e->value.function.esym = NULL;
4922 /* Original was variable so convert array references into
4923 an actual arglist. This does not need any checking now
4924 since gfc_resolve_function will take care of it. */
4925 e->value.function.actual = NULL;
4926 e->expr_type = EXPR_FUNCTION;
4929 /* Ambiguity will not arise if the array reference is not
4930 the last reference. */
4931 for (ref = e->ref; ref; ref = ref->next)
4932 if (ref->type == REF_ARRAY && ref->next == NULL)
4935 gcc_assert (ref->type == REF_ARRAY);
4937 /* Grab the start expressions from the array ref and
4938 copy them into actual arguments. */
4939 for (n = 0; n < ref->u.ar.dimen; n++)
4941 arg = gfc_get_actual_arglist ();
4942 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4943 if (e->value.function.actual == NULL)
4944 tail = e->value.function.actual = arg;
4952 /* Dump the reference list and set the rank. */
4953 gfc_free_ref_list (e->ref);
4955 e->rank = sym->as ? sym->as->rank : 0;
4958 gfc_resolve_expr (e);
4962 /* This might have changed! */
4963 return e->expr_type == EXPR_FUNCTION;
4968 gfc_resolve_character_operator (gfc_expr *e)
4970 gfc_expr *op1 = e->value.op.op1;
4971 gfc_expr *op2 = e->value.op.op2;
4972 gfc_expr *e1 = NULL;
4973 gfc_expr *e2 = NULL;
4975 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4977 if (op1->ts.u.cl && op1->ts.u.cl->length)
4978 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4979 else if (op1->expr_type == EXPR_CONSTANT)
4980 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4981 op1->value.character.length);
4983 if (op2->ts.u.cl && op2->ts.u.cl->length)
4984 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4985 else if (op2->expr_type == EXPR_CONSTANT)
4986 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4987 op2->value.character.length);
4989 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4994 e->ts.u.cl->length = gfc_add (e1, e2);
4995 e->ts.u.cl->length->ts.type = BT_INTEGER;
4996 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4997 gfc_simplify_expr (e->ts.u.cl->length, 0);
4998 gfc_resolve_expr (e->ts.u.cl->length);
5004 /* Ensure that an character expression has a charlen and, if possible, a
5005 length expression. */
5008 fixup_charlen (gfc_expr *e)
5010 /* The cases fall through so that changes in expression type and the need
5011 for multiple fixes are picked up. In all circumstances, a charlen should
5012 be available for the middle end to hang a backend_decl on. */
5013 switch (e->expr_type)
5016 gfc_resolve_character_operator (e);
5019 if (e->expr_type == EXPR_ARRAY)
5020 gfc_resolve_character_array_constructor (e);
5022 case EXPR_SUBSTRING:
5023 if (!e->ts.u.cl && e->ref)
5024 gfc_resolve_substring_charlen (e);
5028 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5035 /* Update an actual argument to include the passed-object for type-bound
5036 procedures at the right position. */
5038 static gfc_actual_arglist*
5039 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5042 gcc_assert (argpos > 0);
5046 gfc_actual_arglist* result;
5048 result = gfc_get_actual_arglist ();
5052 result->name = name;
5058 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5060 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5065 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5068 extract_compcall_passed_object (gfc_expr* e)
5072 gcc_assert (e->expr_type == EXPR_COMPCALL);
5074 if (e->value.compcall.base_object)
5075 po = gfc_copy_expr (e->value.compcall.base_object);
5078 po = gfc_get_expr ();
5079 po->expr_type = EXPR_VARIABLE;
5080 po->symtree = e->symtree;
5081 po->ref = gfc_copy_ref (e->ref);
5082 po->where = e->where;
5085 if (gfc_resolve_expr (po) == FAILURE)
5092 /* Update the arglist of an EXPR_COMPCALL expression to include the
5096 update_compcall_arglist (gfc_expr* e)
5099 gfc_typebound_proc* tbp;
5101 tbp = e->value.compcall.tbp;
5106 po = extract_compcall_passed_object (e);
5110 if (tbp->nopass || e->value.compcall.ignore_pass)
5116 gcc_assert (tbp->pass_arg_num > 0);
5117 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5125 /* Extract the passed object from a PPC call (a copy of it). */
5128 extract_ppc_passed_object (gfc_expr *e)
5133 po = gfc_get_expr ();
5134 po->expr_type = EXPR_VARIABLE;
5135 po->symtree = e->symtree;
5136 po->ref = gfc_copy_ref (e->ref);
5137 po->where = e->where;
5139 /* Remove PPC reference. */
5141 while ((*ref)->next)
5142 ref = &(*ref)->next;
5143 gfc_free_ref_list (*ref);
5146 if (gfc_resolve_expr (po) == FAILURE)
5153 /* Update the actual arglist of a procedure pointer component to include the
5157 update_ppc_arglist (gfc_expr* e)
5161 gfc_typebound_proc* tb;
5163 if (!gfc_is_proc_ptr_comp (e, &ppc))
5170 else if (tb->nopass)
5173 po = extract_ppc_passed_object (e);
5179 gfc_error ("Passed-object at %L must be scalar", &e->where);
5183 gcc_assert (tb->pass_arg_num > 0);
5184 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5192 /* Check that the object a TBP is called on is valid, i.e. it must not be
5193 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5196 check_typebound_baseobject (gfc_expr* e)
5200 base = extract_compcall_passed_object (e);
5204 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5206 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5208 gfc_error ("Base object for type-bound procedure call at %L is of"
5209 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5213 /* If the procedure called is NOPASS, the base object must be scalar. */
5214 if (e->value.compcall.tbp->nopass && base->rank > 0)
5216 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5217 " be scalar", &e->where);
5221 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
5224 gfc_error ("Non-scalar base object at %L currently not implemented",
5233 /* Resolve a call to a type-bound procedure, either function or subroutine,
5234 statically from the data in an EXPR_COMPCALL expression. The adapted
5235 arglist and the target-procedure symtree are returned. */
5238 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5239 gfc_actual_arglist** actual)
5241 gcc_assert (e->expr_type == EXPR_COMPCALL);
5242 gcc_assert (!e->value.compcall.tbp->is_generic);
5244 /* Update the actual arglist for PASS. */
5245 if (update_compcall_arglist (e) == FAILURE)
5248 *actual = e->value.compcall.actual;
5249 *target = e->value.compcall.tbp->u.specific;
5251 gfc_free_ref_list (e->ref);
5253 e->value.compcall.actual = NULL;
5259 /* Get the ultimate declared type from an expression. In addition,
5260 return the last class/derived type reference and the copy of the
5263 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5266 gfc_symbol *declared;
5273 *new_ref = gfc_copy_ref (e->ref);
5275 for (ref = e->ref; ref; ref = ref->next)
5277 if (ref->type != REF_COMPONENT)
5280 if (ref->u.c.component->ts.type == BT_CLASS
5281 || ref->u.c.component->ts.type == BT_DERIVED)
5283 declared = ref->u.c.component->ts.u.derived;
5289 if (declared == NULL)
5290 declared = e->symtree->n.sym->ts.u.derived;
5296 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5297 which of the specific bindings (if any) matches the arglist and transform
5298 the expression into a call of that binding. */
5301 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5303 gfc_typebound_proc* genproc;
5304 const char* genname;
5306 gfc_symbol *derived;
5308 gcc_assert (e->expr_type == EXPR_COMPCALL);
5309 genname = e->value.compcall.name;
5310 genproc = e->value.compcall.tbp;
5312 if (!genproc->is_generic)
5315 /* Try the bindings on this type and in the inheritance hierarchy. */
5316 for (; genproc; genproc = genproc->overridden)
5320 gcc_assert (genproc->is_generic);
5321 for (g = genproc->u.generic; g; g = g->next)
5324 gfc_actual_arglist* args;
5327 gcc_assert (g->specific);
5329 if (g->specific->error)
5332 target = g->specific->u.specific->n.sym;
5334 /* Get the right arglist by handling PASS/NOPASS. */
5335 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5336 if (!g->specific->nopass)
5339 po = extract_compcall_passed_object (e);
5343 gcc_assert (g->specific->pass_arg_num > 0);
5344 gcc_assert (!g->specific->error);
5345 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5346 g->specific->pass_arg);
5348 resolve_actual_arglist (args, target->attr.proc,
5349 is_external_proc (target) && !target->formal);
5351 /* Check if this arglist matches the formal. */
5352 matches = gfc_arglist_matches_symbol (&args, target);
5354 /* Clean up and break out of the loop if we've found it. */
5355 gfc_free_actual_arglist (args);
5358 e->value.compcall.tbp = g->specific;
5359 genname = g->specific_st->name;
5360 /* Pass along the name for CLASS methods, where the vtab
5361 procedure pointer component has to be referenced. */
5369 /* Nothing matching found! */
5370 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5371 " '%s' at %L", genname, &e->where);
5375 /* Make sure that we have the right specific instance for the name. */
5376 derived = get_declared_from_expr (NULL, NULL, e);
5378 st = gfc_find_typebound_proc (derived, NULL, genname, false, &e->where);
5380 e->value.compcall.tbp = st->n.tb;
5386 /* Resolve a call to a type-bound subroutine. */
5389 resolve_typebound_call (gfc_code* c, const char **name)
5391 gfc_actual_arglist* newactual;
5392 gfc_symtree* target;
5394 /* Check that's really a SUBROUTINE. */
5395 if (!c->expr1->value.compcall.tbp->subroutine)
5397 gfc_error ("'%s' at %L should be a SUBROUTINE",
5398 c->expr1->value.compcall.name, &c->loc);
5402 if (check_typebound_baseobject (c->expr1) == FAILURE)
5405 /* Pass along the name for CLASS methods, where the vtab
5406 procedure pointer component has to be referenced. */
5408 *name = c->expr1->value.compcall.name;
5410 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5413 /* Transform into an ordinary EXEC_CALL for now. */
5415 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5418 c->ext.actual = newactual;
5419 c->symtree = target;
5420 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5422 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5424 gfc_free_expr (c->expr1);
5425 c->expr1 = gfc_get_expr ();
5426 c->expr1->expr_type = EXPR_FUNCTION;
5427 c->expr1->symtree = target;
5428 c->expr1->where = c->loc;
5430 return resolve_call (c);
5434 /* Resolve a component-call expression. */
5436 resolve_compcall (gfc_expr* e, const char **name)
5438 gfc_actual_arglist* newactual;
5439 gfc_symtree* target;
5441 /* Check that's really a FUNCTION. */
5442 if (!e->value.compcall.tbp->function)
5444 gfc_error ("'%s' at %L should be a FUNCTION",
5445 e->value.compcall.name, &e->where);
5449 /* These must not be assign-calls! */
5450 gcc_assert (!e->value.compcall.assign);
5452 if (check_typebound_baseobject (e) == FAILURE)
5455 /* Pass along the name for CLASS methods, where the vtab
5456 procedure pointer component has to be referenced. */
5458 *name = e->value.compcall.name;
5460 if (resolve_typebound_generic_call (e, name) == FAILURE)
5462 gcc_assert (!e->value.compcall.tbp->is_generic);
5464 /* Take the rank from the function's symbol. */
5465 if (e->value.compcall.tbp->u.specific->n.sym->as)
5466 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5468 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5469 arglist to the TBP's binding target. */
5471 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5474 e->value.function.actual = newactual;
5475 e->value.function.name = NULL;
5476 e->value.function.esym = target->n.sym;
5477 e->value.function.isym = NULL;
5478 e->symtree = target;
5479 e->ts = target->n.sym->ts;
5480 e->expr_type = EXPR_FUNCTION;
5482 /* Resolution is not necessary if this is a class subroutine; this
5483 function only has to identify the specific proc. Resolution of
5484 the call will be done next in resolve_typebound_call. */
5485 return gfc_resolve_expr (e);
5490 /* Resolve a typebound function, or 'method'. First separate all
5491 the non-CLASS references by calling resolve_compcall directly. */
5494 resolve_typebound_function (gfc_expr* e)
5496 gfc_symbol *declared;
5507 /* Deal with typebound operators for CLASS objects. */
5508 expr = e->value.compcall.base_object;
5509 if (expr && expr->symtree->n.sym->ts.type == BT_CLASS
5510 && e->value.compcall.name)
5512 /* Since the typebound operators are generic, we have to ensure
5513 that any delays in resolution are corrected and that the vtab
5515 ts = expr->symtree->n.sym->ts;
5516 declared = ts.u.derived;
5517 c = gfc_find_component (declared, "$vptr", true, true);
5518 if (c->ts.u.derived == NULL)
5519 c->ts.u.derived = gfc_find_derived_vtab (declared);
5521 if (resolve_compcall (e, &name) == FAILURE)
5524 /* Use the generic name if it is there. */
5525 name = name ? name : e->value.function.esym->name;
5526 e->symtree = expr->symtree;
5527 expr->symtree->n.sym->ts.u.derived = declared;
5528 gfc_add_component_ref (e, "$vptr");
5529 gfc_add_component_ref (e, name);
5530 e->value.function.esym = NULL;
5535 return resolve_compcall (e, NULL);
5537 if (resolve_ref (e) == FAILURE)
5540 /* Get the CLASS declared type. */
5541 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5543 /* Weed out cases of the ultimate component being a derived type. */
5544 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5545 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5547 gfc_free_ref_list (new_ref);
5548 return resolve_compcall (e, NULL);
5551 c = gfc_find_component (declared, "$data", true, true);
5552 declared = c->ts.u.derived;
5554 /* Treat the call as if it is a typebound procedure, in order to roll
5555 out the correct name for the specific function. */
5556 if (resolve_compcall (e, &name) == FAILURE)
5560 /* Then convert the expression to a procedure pointer component call. */
5561 e->value.function.esym = NULL;
5567 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5568 gfc_add_component_ref (e, "$vptr");
5569 gfc_add_component_ref (e, name);
5571 /* Recover the typespec for the expression. This is really only
5572 necessary for generic procedures, where the additional call
5573 to gfc_add_component_ref seems to throw the collection of the
5574 correct typespec. */
5579 /* Resolve a typebound subroutine, or 'method'. First separate all
5580 the non-CLASS references by calling resolve_typebound_call
5584 resolve_typebound_subroutine (gfc_code *code)
5586 gfc_symbol *declared;
5595 st = code->expr1->symtree;
5597 /* Deal with typebound operators for CLASS objects. */
5598 expr = code->expr1->value.compcall.base_object;
5599 if (expr && expr->symtree->n.sym->ts.type == BT_CLASS
5600 && code->expr1->value.compcall.name)
5602 /* Since the typebound operators are generic, we have to ensure
5603 that any delays in resolution are corrected and that the vtab
5605 ts = expr->symtree->n.sym->ts;
5606 declared = ts.u.derived;
5607 c = gfc_find_component (declared, "$vptr", true, true);
5608 if (c->ts.u.derived == NULL)
5609 c->ts.u.derived = gfc_find_derived_vtab (declared);
5611 if (resolve_typebound_call (code, &name) == FAILURE)
5614 /* Use the generic name if it is there. */
5615 name = name ? name : code->expr1->value.function.esym->name;
5616 code->expr1->symtree = expr->symtree;
5617 expr->symtree->n.sym->ts.u.derived = declared;
5618 gfc_add_component_ref (code->expr1, "$vptr");
5619 gfc_add_component_ref (code->expr1, name);
5620 code->expr1->value.function.esym = NULL;
5625 return resolve_typebound_call (code, NULL);
5627 if (resolve_ref (code->expr1) == FAILURE)
5630 /* Get the CLASS declared type. */
5631 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5633 /* Weed out cases of the ultimate component being a derived type. */
5634 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5635 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5637 gfc_free_ref_list (new_ref);
5638 return resolve_typebound_call (code, NULL);
5641 if (resolve_typebound_call (code, &name) == FAILURE)
5643 ts = code->expr1->ts;
5645 /* Then convert the expression to a procedure pointer component call. */
5646 code->expr1->value.function.esym = NULL;
5647 code->expr1->symtree = st;
5650 code->expr1->ref = new_ref;
5652 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5653 gfc_add_component_ref (code->expr1, "$vptr");
5654 gfc_add_component_ref (code->expr1, name);
5656 /* Recover the typespec for the expression. This is really only
5657 necessary for generic procedures, where the additional call
5658 to gfc_add_component_ref seems to throw the collection of the
5659 correct typespec. */
5660 code->expr1->ts = ts;
5665 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5668 resolve_ppc_call (gfc_code* c)
5670 gfc_component *comp;
5673 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5676 c->resolved_sym = c->expr1->symtree->n.sym;
5677 c->expr1->expr_type = EXPR_VARIABLE;
5679 if (!comp->attr.subroutine)
5680 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5682 if (resolve_ref (c->expr1) == FAILURE)
5685 if (update_ppc_arglist (c->expr1) == FAILURE)
5688 c->ext.actual = c->expr1->value.compcall.actual;
5690 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5691 comp->formal == NULL) == FAILURE)
5694 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5700 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5703 resolve_expr_ppc (gfc_expr* e)
5705 gfc_component *comp;
5708 b = gfc_is_proc_ptr_comp (e, &comp);
5711 /* Convert to EXPR_FUNCTION. */
5712 e->expr_type = EXPR_FUNCTION;
5713 e->value.function.isym = NULL;
5714 e->value.function.actual = e->value.compcall.actual;
5716 if (comp->as != NULL)
5717 e->rank = comp->as->rank;
5719 if (!comp->attr.function)
5720 gfc_add_function (&comp->attr, comp->name, &e->where);
5722 if (resolve_ref (e) == FAILURE)
5725 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5726 comp->formal == NULL) == FAILURE)
5729 if (update_ppc_arglist (e) == FAILURE)
5732 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5739 gfc_is_expandable_expr (gfc_expr *e)
5741 gfc_constructor *con;
5743 if (e->expr_type == EXPR_ARRAY)
5745 /* Traverse the constructor looking for variables that are flavor
5746 parameter. Parameters must be expanded since they are fully used at
5748 con = gfc_constructor_first (e->value.constructor);
5749 for (; con; con = gfc_constructor_next (con))
5751 if (con->expr->expr_type == EXPR_VARIABLE
5752 && con->expr->symtree
5753 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5754 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5756 if (con->expr->expr_type == EXPR_ARRAY
5757 && gfc_is_expandable_expr (con->expr))
5765 /* Resolve an expression. That is, make sure that types of operands agree
5766 with their operators, intrinsic operators are converted to function calls
5767 for overloaded types and unresolved function references are resolved. */
5770 gfc_resolve_expr (gfc_expr *e)
5778 /* inquiry_argument only applies to variables. */
5779 inquiry_save = inquiry_argument;
5780 if (e->expr_type != EXPR_VARIABLE)
5781 inquiry_argument = false;
5783 switch (e->expr_type)
5786 t = resolve_operator (e);
5792 if (check_host_association (e))
5793 t = resolve_function (e);
5796 t = resolve_variable (e);
5798 expression_rank (e);
5801 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5802 && e->ref->type != REF_SUBSTRING)
5803 gfc_resolve_substring_charlen (e);
5808 t = resolve_typebound_function (e);
5811 case EXPR_SUBSTRING:
5812 t = resolve_ref (e);
5821 t = resolve_expr_ppc (e);
5826 if (resolve_ref (e) == FAILURE)
5829 t = gfc_resolve_array_constructor (e);
5830 /* Also try to expand a constructor. */
5833 expression_rank (e);
5834 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5835 gfc_expand_constructor (e, false);
5838 /* This provides the opportunity for the length of constructors with
5839 character valued function elements to propagate the string length
5840 to the expression. */
5841 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5843 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5844 here rather then add a duplicate test for it above. */
5845 gfc_expand_constructor (e, false);
5846 t = gfc_resolve_character_array_constructor (e);
5851 case EXPR_STRUCTURE:
5852 t = resolve_ref (e);
5856 t = resolve_structure_cons (e);
5860 t = gfc_simplify_expr (e, 0);
5864 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5867 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5870 inquiry_argument = inquiry_save;
5876 /* Resolve an expression from an iterator. They must be scalar and have
5877 INTEGER or (optionally) REAL type. */
5880 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5881 const char *name_msgid)
5883 if (gfc_resolve_expr (expr) == FAILURE)
5886 if (expr->rank != 0)
5888 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5892 if (expr->ts.type != BT_INTEGER)
5894 if (expr->ts.type == BT_REAL)
5897 return gfc_notify_std (GFC_STD_F95_DEL,
5898 "Deleted feature: %s at %L must be integer",
5899 _(name_msgid), &expr->where);
5902 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5909 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5917 /* Resolve the expressions in an iterator structure. If REAL_OK is
5918 false allow only INTEGER type iterators, otherwise allow REAL types. */
5921 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5923 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5927 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5929 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5934 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5935 "Start expression in DO loop") == FAILURE)
5938 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5939 "End expression in DO loop") == FAILURE)
5942 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5943 "Step expression in DO loop") == FAILURE)
5946 if (iter->step->expr_type == EXPR_CONSTANT)
5948 if ((iter->step->ts.type == BT_INTEGER
5949 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5950 || (iter->step->ts.type == BT_REAL
5951 && mpfr_sgn (iter->step->value.real) == 0))
5953 gfc_error ("Step expression in DO loop at %L cannot be zero",
5954 &iter->step->where);
5959 /* Convert start, end, and step to the same type as var. */
5960 if (iter->start->ts.kind != iter->var->ts.kind
5961 || iter->start->ts.type != iter->var->ts.type)
5962 gfc_convert_type (iter->start, &iter->var->ts, 2);
5964 if (iter->end->ts.kind != iter->var->ts.kind
5965 || iter->end->ts.type != iter->var->ts.type)
5966 gfc_convert_type (iter->end, &iter->var->ts, 2);
5968 if (iter->step->ts.kind != iter->var->ts.kind
5969 || iter->step->ts.type != iter->var->ts.type)
5970 gfc_convert_type (iter->step, &iter->var->ts, 2);
5972 if (iter->start->expr_type == EXPR_CONSTANT
5973 && iter->end->expr_type == EXPR_CONSTANT
5974 && iter->step->expr_type == EXPR_CONSTANT)
5977 if (iter->start->ts.type == BT_INTEGER)
5979 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5980 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5984 sgn = mpfr_sgn (iter->step->value.real);
5985 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5987 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5988 gfc_warning ("DO loop at %L will be executed zero times",
5989 &iter->step->where);
5996 /* Traversal function for find_forall_index. f == 2 signals that
5997 that variable itself is not to be checked - only the references. */
6000 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6002 if (expr->expr_type != EXPR_VARIABLE)
6005 /* A scalar assignment */
6006 if (!expr->ref || *f == 1)
6008 if (expr->symtree->n.sym == sym)
6020 /* Check whether the FORALL index appears in the expression or not.
6021 Returns SUCCESS if SYM is found in EXPR. */
6024 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6026 if (gfc_traverse_expr (expr, sym, forall_index, f))
6033 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6034 to be a scalar INTEGER variable. The subscripts and stride are scalar
6035 INTEGERs, and if stride is a constant it must be nonzero.
6036 Furthermore "A subscript or stride in a forall-triplet-spec shall
6037 not contain a reference to any index-name in the
6038 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6041 resolve_forall_iterators (gfc_forall_iterator *it)
6043 gfc_forall_iterator *iter, *iter2;
6045 for (iter = it; iter; iter = iter->next)
6047 if (gfc_resolve_expr (iter->var) == SUCCESS
6048 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6049 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6052 if (gfc_resolve_expr (iter->start) == SUCCESS
6053 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6054 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6055 &iter->start->where);
6056 if (iter->var->ts.kind != iter->start->ts.kind)
6057 gfc_convert_type (iter->start, &iter->var->ts, 2);
6059 if (gfc_resolve_expr (iter->end) == SUCCESS
6060 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6061 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6063 if (iter->var->ts.kind != iter->end->ts.kind)
6064 gfc_convert_type (iter->end, &iter->var->ts, 2);
6066 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6068 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6069 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6070 &iter->stride->where, "INTEGER");
6072 if (iter->stride->expr_type == EXPR_CONSTANT
6073 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6074 gfc_error ("FORALL stride expression at %L cannot be zero",
6075 &iter->stride->where);
6077 if (iter->var->ts.kind != iter->stride->ts.kind)
6078 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6081 for (iter = it; iter; iter = iter->next)
6082 for (iter2 = iter; iter2; iter2 = iter2->next)
6084 if (find_forall_index (iter2->start,
6085 iter->var->symtree->n.sym, 0) == SUCCESS
6086 || find_forall_index (iter2->end,
6087 iter->var->symtree->n.sym, 0) == SUCCESS
6088 || find_forall_index (iter2->stride,
6089 iter->var->symtree->n.sym, 0) == SUCCESS)
6090 gfc_error ("FORALL index '%s' may not appear in triplet "
6091 "specification at %L", iter->var->symtree->name,
6092 &iter2->start->where);
6097 /* Given a pointer to a symbol that is a derived type, see if it's
6098 inaccessible, i.e. if it's defined in another module and the components are
6099 PRIVATE. The search is recursive if necessary. Returns zero if no
6100 inaccessible components are found, nonzero otherwise. */
6103 derived_inaccessible (gfc_symbol *sym)
6107 if (sym->attr.use_assoc && sym->attr.private_comp)
6110 for (c = sym->components; c; c = c->next)
6112 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6120 /* Resolve the argument of a deallocate expression. The expression must be
6121 a pointer or a full array. */
6124 resolve_deallocate_expr (gfc_expr *e)
6126 symbol_attribute attr;
6127 int allocatable, pointer, check_intent_in;
6132 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6133 check_intent_in = 1;
6135 if (gfc_resolve_expr (e) == FAILURE)
6138 if (e->expr_type != EXPR_VARIABLE)
6141 sym = e->symtree->n.sym;
6143 if (sym->ts.type == BT_CLASS)
6145 allocatable = CLASS_DATA (sym)->attr.allocatable;
6146 pointer = CLASS_DATA (sym)->attr.class_pointer;
6150 allocatable = sym->attr.allocatable;
6151 pointer = sym->attr.pointer;
6153 for (ref = e->ref; ref; ref = ref->next)
6156 check_intent_in = 0;
6161 if (ref->u.ar.type != AR_FULL)
6166 c = ref->u.c.component;
6167 if (c->ts.type == BT_CLASS)
6169 allocatable = CLASS_DATA (c)->attr.allocatable;
6170 pointer = CLASS_DATA (c)->attr.class_pointer;
6174 allocatable = c->attr.allocatable;
6175 pointer = c->attr.pointer;
6185 attr = gfc_expr_attr (e);
6187 if (allocatable == 0 && attr.pointer == 0)
6190 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6195 if (check_intent_in && sym->attr.intent == INTENT_IN)
6197 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
6198 sym->name, &e->where);
6202 if (e->ts.type == BT_CLASS)
6204 /* Only deallocate the DATA component. */
6205 gfc_add_component_ref (e, "$data");
6212 /* Returns true if the expression e contains a reference to the symbol sym. */
6214 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6216 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6223 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6225 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6229 /* Given the expression node e for an allocatable/pointer of derived type to be
6230 allocated, get the expression node to be initialized afterwards (needed for
6231 derived types with default initializers, and derived types with allocatable
6232 components that need nullification.) */
6235 gfc_expr_to_initialize (gfc_expr *e)
6241 result = gfc_copy_expr (e);
6243 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6244 for (ref = result->ref; ref; ref = ref->next)
6245 if (ref->type == REF_ARRAY && ref->next == NULL)
6247 ref->u.ar.type = AR_FULL;
6249 for (i = 0; i < ref->u.ar.dimen; i++)
6250 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6252 result->rank = ref->u.ar.dimen;
6260 /* Used in resolve_allocate_expr to check that a allocation-object and
6261 a source-expr are conformable. This does not catch all possible
6262 cases; in particular a runtime checking is needed. */
6265 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6268 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6270 /* First compare rank. */
6271 if (tail && e1->rank != tail->u.ar.as->rank)
6273 gfc_error ("Source-expr at %L must be scalar or have the "
6274 "same rank as the allocate-object at %L",
6275 &e1->where, &e2->where);
6286 for (i = 0; i < e1->rank; i++)
6288 if (tail->u.ar.end[i])
6290 mpz_set (s, tail->u.ar.end[i]->value.integer);
6291 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6292 mpz_add_ui (s, s, 1);
6296 mpz_set (s, tail->u.ar.start[i]->value.integer);
6299 if (mpz_cmp (e1->shape[i], s) != 0)
6301 gfc_error ("Source-expr at %L and allocate-object at %L must "
6302 "have the same shape", &e1->where, &e2->where);
6315 /* Resolve the expression in an ALLOCATE statement, doing the additional
6316 checks to see whether the expression is OK or not. The expression must
6317 have a trailing array reference that gives the size of the array. */
6320 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6322 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6324 symbol_attribute attr;
6325 gfc_ref *ref, *ref2;
6327 gfc_symbol *sym = NULL;
6331 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6332 check_intent_in = 1;
6334 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6335 checking of coarrays. */
6336 for (ref = e->ref; ref; ref = ref->next)
6337 if (ref->next == NULL)
6340 if (ref && ref->type == REF_ARRAY)
6341 ref->u.ar.in_allocate = true;
6343 if (gfc_resolve_expr (e) == FAILURE)
6346 /* Make sure the expression is allocatable or a pointer. If it is
6347 pointer, the next-to-last reference must be a pointer. */
6351 sym = e->symtree->n.sym;
6353 /* Check whether ultimate component is abstract and CLASS. */
6356 if (e->expr_type != EXPR_VARIABLE)
6359 attr = gfc_expr_attr (e);
6360 pointer = attr.pointer;
6361 dimension = attr.dimension;
6362 codimension = attr.codimension;
6366 if (sym->ts.type == BT_CLASS)
6368 allocatable = CLASS_DATA (sym)->attr.allocatable;
6369 pointer = CLASS_DATA (sym)->attr.class_pointer;
6370 dimension = CLASS_DATA (sym)->attr.dimension;
6371 codimension = CLASS_DATA (sym)->attr.codimension;
6372 is_abstract = CLASS_DATA (sym)->attr.abstract;
6376 allocatable = sym->attr.allocatable;
6377 pointer = sym->attr.pointer;
6378 dimension = sym->attr.dimension;
6379 codimension = sym->attr.codimension;
6382 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6385 check_intent_in = 0;
6390 if (ref->next != NULL)
6396 if (gfc_is_coindexed (e))
6398 gfc_error ("Coindexed allocatable object at %L",
6403 c = ref->u.c.component;
6404 if (c->ts.type == BT_CLASS)
6406 allocatable = CLASS_DATA (c)->attr.allocatable;
6407 pointer = CLASS_DATA (c)->attr.class_pointer;
6408 dimension = CLASS_DATA (c)->attr.dimension;
6409 codimension = CLASS_DATA (c)->attr.codimension;
6410 is_abstract = CLASS_DATA (c)->attr.abstract;
6414 allocatable = c->attr.allocatable;
6415 pointer = c->attr.pointer;
6416 dimension = c->attr.dimension;
6417 codimension = c->attr.codimension;
6418 is_abstract = c->attr.abstract;
6430 if (allocatable == 0 && pointer == 0)
6432 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6437 /* Some checks for the SOURCE tag. */
6440 /* Check F03:C631. */
6441 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6443 gfc_error ("Type of entity at %L is type incompatible with "
6444 "source-expr at %L", &e->where, &code->expr3->where);
6448 /* Check F03:C632 and restriction following Note 6.18. */
6449 if (code->expr3->rank > 0
6450 && conformable_arrays (code->expr3, e) == FAILURE)
6453 /* Check F03:C633. */
6454 if (code->expr3->ts.kind != e->ts.kind)
6456 gfc_error ("The allocate-object at %L and the source-expr at %L "
6457 "shall have the same kind type parameter",
6458 &e->where, &code->expr3->where);
6463 /* Check F08:C629. */
6464 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6467 gcc_assert (e->ts.type == BT_CLASS);
6468 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6469 "type-spec or source-expr", sym->name, &e->where);
6473 if (check_intent_in && sym->attr.intent == INTENT_IN)
6475 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6476 sym->name, &e->where);
6480 if (!code->expr3 || code->expr3->mold)
6482 /* Add default initializer for those derived types that need them. */
6483 gfc_expr *init_e = NULL;
6486 if (code->ext.alloc.ts.type == BT_DERIVED)
6487 ts = code->ext.alloc.ts;
6488 else if (code->expr3)
6489 ts = code->expr3->ts;
6493 if (ts.type == BT_DERIVED)
6494 init_e = gfc_default_initializer (&ts);
6495 /* FIXME: Use default init of dynamic type (cf. PR 44541). */
6496 else if (e->ts.type == BT_CLASS)
6497 init_e = gfc_default_initializer (&ts.u.derived->components->ts);
6501 gfc_code *init_st = gfc_get_code ();
6502 init_st->loc = code->loc;
6503 init_st->op = EXEC_INIT_ASSIGN;
6504 init_st->expr1 = gfc_expr_to_initialize (e);
6505 init_st->expr2 = init_e;
6506 init_st->next = code->next;
6507 code->next = init_st;
6511 if (pointer || (dimension == 0 && codimension == 0))
6514 /* Make sure the next-to-last reference node is an array specification. */
6516 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6517 || (dimension && ref2->u.ar.dimen == 0))
6519 gfc_error ("Array specification required in ALLOCATE statement "
6520 "at %L", &e->where);
6524 /* Make sure that the array section reference makes sense in the
6525 context of an ALLOCATE specification. */
6529 if (codimension && ar->codimen == 0)
6531 gfc_error ("Coarray specification required in ALLOCATE statement "
6532 "at %L", &e->where);
6536 for (i = 0; i < ar->dimen; i++)
6538 if (ref2->u.ar.type == AR_ELEMENT)
6541 switch (ar->dimen_type[i])
6547 if (ar->start[i] != NULL
6548 && ar->end[i] != NULL
6549 && ar->stride[i] == NULL)
6552 /* Fall Through... */
6557 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6563 for (a = code->ext.alloc.list; a; a = a->next)
6565 sym = a->expr->symtree->n.sym;
6567 /* TODO - check derived type components. */
6568 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6571 if ((ar->start[i] != NULL
6572 && gfc_find_sym_in_expr (sym, ar->start[i]))
6573 || (ar->end[i] != NULL
6574 && gfc_find_sym_in_expr (sym, ar->end[i])))
6576 gfc_error ("'%s' must not appear in the array specification at "
6577 "%L in the same ALLOCATE statement where it is "
6578 "itself allocated", sym->name, &ar->where);
6584 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6586 if (ar->dimen_type[i] == DIMEN_ELEMENT
6587 || ar->dimen_type[i] == DIMEN_RANGE)
6589 if (i == (ar->dimen + ar->codimen - 1))
6591 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6592 "statement at %L", &e->where);
6598 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6599 && ar->stride[i] == NULL)
6602 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6607 if (codimension && ar->as->rank == 0)
6609 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6610 "at %L", &e->where);
6622 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6624 gfc_expr *stat, *errmsg, *pe, *qe;
6625 gfc_alloc *a, *p, *q;
6627 stat = code->expr1 ? code->expr1 : NULL;
6629 errmsg = code->expr2 ? code->expr2 : NULL;
6631 /* Check the stat variable. */
6634 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6635 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6636 stat->symtree->n.sym->name, &stat->where);
6638 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6639 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6642 if ((stat->ts.type != BT_INTEGER
6643 && !(stat->ref && (stat->ref->type == REF_ARRAY
6644 || stat->ref->type == REF_COMPONENT)))
6646 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6647 "variable", &stat->where);
6649 for (p = code->ext.alloc.list; p; p = p->next)
6650 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6652 gfc_ref *ref1, *ref2;
6655 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
6656 ref1 = ref1->next, ref2 = ref2->next)
6658 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6660 if (ref1->u.c.component->name != ref2->u.c.component->name)
6669 gfc_error ("Stat-variable at %L shall not be %sd within "
6670 "the same %s statement", &stat->where, fcn, fcn);
6676 /* Check the errmsg variable. */
6680 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6683 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6684 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6685 errmsg->symtree->n.sym->name, &errmsg->where);
6687 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6688 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6691 if ((errmsg->ts.type != BT_CHARACTER
6693 && (errmsg->ref->type == REF_ARRAY
6694 || errmsg->ref->type == REF_COMPONENT)))
6695 || errmsg->rank > 0 )
6696 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6697 "variable", &errmsg->where);
6699 for (p = code->ext.alloc.list; p; p = p->next)
6700 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6702 gfc_ref *ref1, *ref2;
6705 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
6706 ref1 = ref1->next, ref2 = ref2->next)
6708 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6710 if (ref1->u.c.component->name != ref2->u.c.component->name)
6719 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6720 "the same %s statement", &errmsg->where, fcn, fcn);
6726 /* Check that an allocate-object appears only once in the statement.
6727 FIXME: Checking derived types is disabled. */
6728 for (p = code->ext.alloc.list; p; p = p->next)
6731 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6732 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6734 for (q = p->next; q; q = q->next)
6737 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6738 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6739 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6740 gfc_error ("Allocate-object at %L also appears at %L",
6741 &pe->where, &qe->where);
6746 if (strcmp (fcn, "ALLOCATE") == 0)
6748 for (a = code->ext.alloc.list; a; a = a->next)
6749 resolve_allocate_expr (a->expr, code);
6753 for (a = code->ext.alloc.list; a; a = a->next)
6754 resolve_deallocate_expr (a->expr);
6759 /************ SELECT CASE resolution subroutines ************/
6761 /* Callback function for our mergesort variant. Determines interval
6762 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6763 op1 > op2. Assumes we're not dealing with the default case.
6764 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6765 There are nine situations to check. */
6768 compare_cases (const gfc_case *op1, const gfc_case *op2)
6772 if (op1->low == NULL) /* op1 = (:L) */
6774 /* op2 = (:N), so overlap. */
6776 /* op2 = (M:) or (M:N), L < M */
6777 if (op2->low != NULL
6778 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6781 else if (op1->high == NULL) /* op1 = (K:) */
6783 /* op2 = (M:), so overlap. */
6785 /* op2 = (:N) or (M:N), K > N */
6786 if (op2->high != NULL
6787 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6790 else /* op1 = (K:L) */
6792 if (op2->low == NULL) /* op2 = (:N), K > N */
6793 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6795 else if (op2->high == NULL) /* op2 = (M:), L < M */
6796 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6798 else /* op2 = (M:N) */
6802 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6805 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6814 /* Merge-sort a double linked case list, detecting overlap in the
6815 process. LIST is the head of the double linked case list before it
6816 is sorted. Returns the head of the sorted list if we don't see any
6817 overlap, or NULL otherwise. */
6820 check_case_overlap (gfc_case *list)
6822 gfc_case *p, *q, *e, *tail;
6823 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6825 /* If the passed list was empty, return immediately. */
6832 /* Loop unconditionally. The only exit from this loop is a return
6833 statement, when we've finished sorting the case list. */
6840 /* Count the number of merges we do in this pass. */
6843 /* Loop while there exists a merge to be done. */
6848 /* Count this merge. */
6851 /* Cut the list in two pieces by stepping INSIZE places
6852 forward in the list, starting from P. */
6855 for (i = 0; i < insize; i++)
6864 /* Now we have two lists. Merge them! */
6865 while (psize > 0 || (qsize > 0 && q != NULL))
6867 /* See from which the next case to merge comes from. */
6870 /* P is empty so the next case must come from Q. */
6875 else if (qsize == 0 || q == NULL)
6884 cmp = compare_cases (p, q);
6887 /* The whole case range for P is less than the
6895 /* The whole case range for Q is greater than
6896 the case range for P. */
6903 /* The cases overlap, or they are the same
6904 element in the list. Either way, we must
6905 issue an error and get the next case from P. */
6906 /* FIXME: Sort P and Q by line number. */
6907 gfc_error ("CASE label at %L overlaps with CASE "
6908 "label at %L", &p->where, &q->where);
6916 /* Add the next element to the merged list. */
6925 /* P has now stepped INSIZE places along, and so has Q. So
6926 they're the same. */
6931 /* If we have done only one merge or none at all, we've
6932 finished sorting the cases. */
6941 /* Otherwise repeat, merging lists twice the size. */
6947 /* Check to see if an expression is suitable for use in a CASE statement.
6948 Makes sure that all case expressions are scalar constants of the same
6949 type. Return FAILURE if anything is wrong. */
6952 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6954 if (e == NULL) return SUCCESS;
6956 if (e->ts.type != case_expr->ts.type)
6958 gfc_error ("Expression in CASE statement at %L must be of type %s",
6959 &e->where, gfc_basic_typename (case_expr->ts.type));
6963 /* C805 (R808) For a given case-construct, each case-value shall be of
6964 the same type as case-expr. For character type, length differences
6965 are allowed, but the kind type parameters shall be the same. */
6967 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6969 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6970 &e->where, case_expr->ts.kind);
6974 /* Convert the case value kind to that of case expression kind,
6977 if (e->ts.kind != case_expr->ts.kind)
6978 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6982 gfc_error ("Expression in CASE statement at %L must be scalar",
6991 /* Given a completely parsed select statement, we:
6993 - Validate all expressions and code within the SELECT.
6994 - Make sure that the selection expression is not of the wrong type.
6995 - Make sure that no case ranges overlap.
6996 - Eliminate unreachable cases and unreachable code resulting from
6997 removing case labels.
6999 The standard does allow unreachable cases, e.g. CASE (5:3). But
7000 they are a hassle for code generation, and to prevent that, we just
7001 cut them out here. This is not necessary for overlapping cases
7002 because they are illegal and we never even try to generate code.
7004 We have the additional caveat that a SELECT construct could have
7005 been a computed GOTO in the source code. Fortunately we can fairly
7006 easily work around that here: The case_expr for a "real" SELECT CASE
7007 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7008 we have to do is make sure that the case_expr is a scalar integer
7012 resolve_select (gfc_code *code)
7015 gfc_expr *case_expr;
7016 gfc_case *cp, *default_case, *tail, *head;
7017 int seen_unreachable;
7023 if (code->expr1 == NULL)
7025 /* This was actually a computed GOTO statement. */
7026 case_expr = code->expr2;
7027 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7028 gfc_error ("Selection expression in computed GOTO statement "
7029 "at %L must be a scalar integer expression",
7032 /* Further checking is not necessary because this SELECT was built
7033 by the compiler, so it should always be OK. Just move the
7034 case_expr from expr2 to expr so that we can handle computed
7035 GOTOs as normal SELECTs from here on. */
7036 code->expr1 = code->expr2;
7041 case_expr = code->expr1;
7043 type = case_expr->ts.type;
7044 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7046 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7047 &case_expr->where, gfc_typename (&case_expr->ts));
7049 /* Punt. Going on here just produce more garbage error messages. */
7053 if (case_expr->rank != 0)
7055 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7056 "expression", &case_expr->where);
7063 /* Raise a warning if an INTEGER case value exceeds the range of
7064 the case-expr. Later, all expressions will be promoted to the
7065 largest kind of all case-labels. */
7067 if (type == BT_INTEGER)
7068 for (body = code->block; body; body = body->block)
7069 for (cp = body->ext.case_list; cp; cp = cp->next)
7072 && gfc_check_integer_range (cp->low->value.integer,
7073 case_expr->ts.kind) != ARITH_OK)
7074 gfc_warning ("Expression in CASE statement at %L is "
7075 "not in the range of %s", &cp->low->where,
7076 gfc_typename (&case_expr->ts));
7079 && cp->low != cp->high
7080 && gfc_check_integer_range (cp->high->value.integer,
7081 case_expr->ts.kind) != ARITH_OK)
7082 gfc_warning ("Expression in CASE statement at %L is "
7083 "not in the range of %s", &cp->high->where,
7084 gfc_typename (&case_expr->ts));
7087 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7088 of the SELECT CASE expression and its CASE values. Walk the lists
7089 of case values, and if we find a mismatch, promote case_expr to
7090 the appropriate kind. */
7092 if (type == BT_LOGICAL || type == BT_INTEGER)
7094 for (body = code->block; body; body = body->block)
7096 /* Walk the case label list. */
7097 for (cp = body->ext.case_list; cp; cp = cp->next)
7099 /* Intercept the DEFAULT case. It does not have a kind. */
7100 if (cp->low == NULL && cp->high == NULL)
7103 /* Unreachable case ranges are discarded, so ignore. */
7104 if (cp->low != NULL && cp->high != NULL
7105 && cp->low != cp->high
7106 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7110 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7111 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7113 if (cp->high != NULL
7114 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7115 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7120 /* Assume there is no DEFAULT case. */
7121 default_case = NULL;
7126 for (body = code->block; body; body = body->block)
7128 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7130 seen_unreachable = 0;
7132 /* Walk the case label list, making sure that all case labels
7134 for (cp = body->ext.case_list; cp; cp = cp->next)
7136 /* Count the number of cases in the whole construct. */
7139 /* Intercept the DEFAULT case. */
7140 if (cp->low == NULL && cp->high == NULL)
7142 if (default_case != NULL)
7144 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7145 "by a second DEFAULT CASE at %L",
7146 &default_case->where, &cp->where);
7157 /* Deal with single value cases and case ranges. Errors are
7158 issued from the validation function. */
7159 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7160 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7166 if (type == BT_LOGICAL
7167 && ((cp->low == NULL || cp->high == NULL)
7168 || cp->low != cp->high))
7170 gfc_error ("Logical range in CASE statement at %L is not "
7171 "allowed", &cp->low->where);
7176 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7179 value = cp->low->value.logical == 0 ? 2 : 1;
7180 if (value & seen_logical)
7182 gfc_error ("Constant logical value in CASE statement "
7183 "is repeated at %L",
7188 seen_logical |= value;
7191 if (cp->low != NULL && cp->high != NULL
7192 && cp->low != cp->high
7193 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7195 if (gfc_option.warn_surprising)
7196 gfc_warning ("Range specification at %L can never "
7197 "be matched", &cp->where);
7199 cp->unreachable = 1;
7200 seen_unreachable = 1;
7204 /* If the case range can be matched, it can also overlap with
7205 other cases. To make sure it does not, we put it in a
7206 double linked list here. We sort that with a merge sort
7207 later on to detect any overlapping cases. */
7211 head->right = head->left = NULL;
7216 tail->right->left = tail;
7223 /* It there was a failure in the previous case label, give up
7224 for this case label list. Continue with the next block. */
7228 /* See if any case labels that are unreachable have been seen.
7229 If so, we eliminate them. This is a bit of a kludge because
7230 the case lists for a single case statement (label) is a
7231 single forward linked lists. */
7232 if (seen_unreachable)
7234 /* Advance until the first case in the list is reachable. */
7235 while (body->ext.case_list != NULL
7236 && body->ext.case_list->unreachable)
7238 gfc_case *n = body->ext.case_list;
7239 body->ext.case_list = body->ext.case_list->next;
7241 gfc_free_case_list (n);
7244 /* Strip all other unreachable cases. */
7245 if (body->ext.case_list)
7247 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7249 if (cp->next->unreachable)
7251 gfc_case *n = cp->next;
7252 cp->next = cp->next->next;
7254 gfc_free_case_list (n);
7261 /* See if there were overlapping cases. If the check returns NULL,
7262 there was overlap. In that case we don't do anything. If head
7263 is non-NULL, we prepend the DEFAULT case. The sorted list can
7264 then used during code generation for SELECT CASE constructs with
7265 a case expression of a CHARACTER type. */
7268 head = check_case_overlap (head);
7270 /* Prepend the default_case if it is there. */
7271 if (head != NULL && default_case)
7273 default_case->left = NULL;
7274 default_case->right = head;
7275 head->left = default_case;
7279 /* Eliminate dead blocks that may be the result if we've seen
7280 unreachable case labels for a block. */
7281 for (body = code; body && body->block; body = body->block)
7283 if (body->block->ext.case_list == NULL)
7285 /* Cut the unreachable block from the code chain. */
7286 gfc_code *c = body->block;
7287 body->block = c->block;
7289 /* Kill the dead block, but not the blocks below it. */
7291 gfc_free_statements (c);
7295 /* More than two cases is legal but insane for logical selects.
7296 Issue a warning for it. */
7297 if (gfc_option.warn_surprising && type == BT_LOGICAL
7299 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7304 /* Check if a derived type is extensible. */
7307 gfc_type_is_extensible (gfc_symbol *sym)
7309 return !(sym->attr.is_bind_c || sym->attr.sequence);
7313 /* Resolve a SELECT TYPE statement. */
7316 resolve_select_type (gfc_code *code)
7318 gfc_symbol *selector_type;
7319 gfc_code *body, *new_st, *if_st, *tail;
7320 gfc_code *class_is = NULL, *default_case = NULL;
7323 char name[GFC_MAX_SYMBOL_LEN];
7327 ns = code->ext.block.ns;
7330 /* Check for F03:C813. */
7331 if (code->expr1->ts.type != BT_CLASS
7332 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7334 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7335 "at %L", &code->loc);
7341 if (code->expr1->symtree->n.sym->attr.untyped)
7342 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7343 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7346 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7348 /* Loop over TYPE IS / CLASS IS cases. */
7349 for (body = code->block; body; body = body->block)
7351 c = body->ext.case_list;
7353 /* Check F03:C815. */
7354 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7355 && !gfc_type_is_extensible (c->ts.u.derived))
7357 gfc_error ("Derived type '%s' at %L must be extensible",
7358 c->ts.u.derived->name, &c->where);
7363 /* Check F03:C816. */
7364 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7365 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7367 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7368 c->ts.u.derived->name, &c->where, selector_type->name);
7373 /* Intercept the DEFAULT case. */
7374 if (c->ts.type == BT_UNKNOWN)
7376 /* Check F03:C818. */
7379 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7380 "by a second DEFAULT CASE at %L",
7381 &default_case->ext.case_list->where, &c->where);
7386 default_case = body;
7395 /* Insert assignment for selector variable. */
7396 new_st = gfc_get_code ();
7397 new_st->op = EXEC_ASSIGN;
7398 new_st->expr1 = gfc_copy_expr (code->expr1);
7399 new_st->expr2 = gfc_copy_expr (code->expr2);
7403 /* Put SELECT TYPE statement inside a BLOCK. */
7404 new_st = gfc_get_code ();
7405 new_st->op = code->op;
7406 new_st->expr1 = code->expr1;
7407 new_st->expr2 = code->expr2;
7408 new_st->block = code->block;
7412 ns->code->next = new_st;
7413 code->op = EXEC_BLOCK;
7414 code->ext.block.assoc = NULL;
7415 code->expr1 = code->expr2 = NULL;
7420 /* Transform to EXEC_SELECT. */
7421 code->op = EXEC_SELECT;
7422 gfc_add_component_ref (code->expr1, "$vptr");
7423 gfc_add_component_ref (code->expr1, "$hash");
7425 /* Loop over TYPE IS / CLASS IS cases. */
7426 for (body = code->block; body; body = body->block)
7428 c = body->ext.case_list;
7430 if (c->ts.type == BT_DERIVED)
7431 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7432 c->ts.u.derived->hash_value);
7434 else if (c->ts.type == BT_UNKNOWN)
7437 /* Assign temporary to selector. */
7438 if (c->ts.type == BT_CLASS)
7439 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7441 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7442 st = gfc_find_symtree (ns->sym_root, name);
7443 new_st = gfc_get_code ();
7444 new_st->expr1 = gfc_get_variable_expr (st);
7445 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7446 if (c->ts.type == BT_DERIVED)
7448 new_st->op = EXEC_POINTER_ASSIGN;
7449 gfc_add_component_ref (new_st->expr2, "$data");
7452 new_st->op = EXEC_POINTER_ASSIGN;
7453 new_st->next = body->next;
7454 body->next = new_st;
7457 /* Take out CLASS IS cases for separate treatment. */
7459 while (body && body->block)
7461 if (body->block->ext.case_list->ts.type == BT_CLASS)
7463 /* Add to class_is list. */
7464 if (class_is == NULL)
7466 class_is = body->block;
7471 for (tail = class_is; tail->block; tail = tail->block) ;
7472 tail->block = body->block;
7475 /* Remove from EXEC_SELECT list. */
7476 body->block = body->block->block;
7489 /* Add a default case to hold the CLASS IS cases. */
7490 for (tail = code; tail->block; tail = tail->block) ;
7491 tail->block = gfc_get_code ();
7493 tail->op = EXEC_SELECT_TYPE;
7494 tail->ext.case_list = gfc_get_case ();
7495 tail->ext.case_list->ts.type = BT_UNKNOWN;
7497 default_case = tail;
7500 /* More than one CLASS IS block? */
7501 if (class_is->block)
7505 /* Sort CLASS IS blocks by extension level. */
7509 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7512 /* F03:C817 (check for doubles). */
7513 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7514 == c2->ext.case_list->ts.u.derived->hash_value)
7516 gfc_error ("Double CLASS IS block in SELECT TYPE "
7517 "statement at %L", &c2->ext.case_list->where);
7520 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7521 < c2->ext.case_list->ts.u.derived->attr.extension)
7524 (*c1)->block = c2->block;
7534 /* Generate IF chain. */
7535 if_st = gfc_get_code ();
7536 if_st->op = EXEC_IF;
7538 for (body = class_is; body; body = body->block)
7540 new_st->block = gfc_get_code ();
7541 new_st = new_st->block;
7542 new_st->op = EXEC_IF;
7543 /* Set up IF condition: Call _gfortran_is_extension_of. */
7544 new_st->expr1 = gfc_get_expr ();
7545 new_st->expr1->expr_type = EXPR_FUNCTION;
7546 new_st->expr1->ts.type = BT_LOGICAL;
7547 new_st->expr1->ts.kind = 4;
7548 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7549 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7550 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7551 /* Set up arguments. */
7552 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7553 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7554 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7555 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived);
7556 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7557 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7558 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7559 new_st->next = body->next;
7561 if (default_case->next)
7563 new_st->block = gfc_get_code ();
7564 new_st = new_st->block;
7565 new_st->op = EXEC_IF;
7566 new_st->next = default_case->next;
7569 /* Replace CLASS DEFAULT code by the IF chain. */
7570 default_case->next = if_st;
7573 resolve_select (code);
7578 /* Resolve a transfer statement. This is making sure that:
7579 -- a derived type being transferred has only non-pointer components
7580 -- a derived type being transferred doesn't have private components, unless
7581 it's being transferred from the module where the type was defined
7582 -- we're not trying to transfer a whole assumed size array. */
7585 resolve_transfer (gfc_code *code)
7594 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7597 sym = exp->symtree->n.sym;
7600 /* Go to actual component transferred. */
7601 for (ref = code->expr1->ref; ref; ref = ref->next)
7602 if (ref->type == REF_COMPONENT)
7603 ts = &ref->u.c.component->ts;
7605 if (ts->type == BT_DERIVED)
7607 /* Check that transferred derived type doesn't contain POINTER
7609 if (ts->u.derived->attr.pointer_comp)
7611 gfc_error ("Data transfer element at %L cannot have "
7612 "POINTER components", &code->loc);
7616 if (ts->u.derived->attr.alloc_comp)
7618 gfc_error ("Data transfer element at %L cannot have "
7619 "ALLOCATABLE components", &code->loc);
7623 if (derived_inaccessible (ts->u.derived))
7625 gfc_error ("Data transfer element at %L cannot have "
7626 "PRIVATE components",&code->loc);
7631 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7632 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7634 gfc_error ("Data transfer element at %L cannot be a full reference to "
7635 "an assumed-size array", &code->loc);
7641 /*********** Toplevel code resolution subroutines ***********/
7643 /* Find the set of labels that are reachable from this block. We also
7644 record the last statement in each block. */
7647 find_reachable_labels (gfc_code *block)
7654 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7656 /* Collect labels in this block. We don't keep those corresponding
7657 to END {IF|SELECT}, these are checked in resolve_branch by going
7658 up through the code_stack. */
7659 for (c = block; c; c = c->next)
7661 if (c->here && c->op != EXEC_END_BLOCK)
7662 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7665 /* Merge with labels from parent block. */
7668 gcc_assert (cs_base->prev->reachable_labels);
7669 bitmap_ior_into (cs_base->reachable_labels,
7670 cs_base->prev->reachable_labels);
7676 resolve_sync (gfc_code *code)
7678 /* Check imageset. The * case matches expr1 == NULL. */
7681 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7682 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7683 "INTEGER expression", &code->expr1->where);
7684 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7685 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7686 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7687 &code->expr1->where);
7688 else if (code->expr1->expr_type == EXPR_ARRAY
7689 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7691 gfc_constructor *cons;
7692 cons = gfc_constructor_first (code->expr1->value.constructor);
7693 for (; cons; cons = gfc_constructor_next (cons))
7694 if (cons->expr->expr_type == EXPR_CONSTANT
7695 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7696 gfc_error ("Imageset argument at %L must between 1 and "
7697 "num_images()", &cons->expr->where);
7703 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7704 || code->expr2->expr_type != EXPR_VARIABLE))
7705 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7706 &code->expr2->where);
7710 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7711 || code->expr3->expr_type != EXPR_VARIABLE))
7712 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7713 &code->expr3->where);
7717 /* Given a branch to a label, see if the branch is conforming.
7718 The code node describes where the branch is located. */
7721 resolve_branch (gfc_st_label *label, gfc_code *code)
7728 /* Step one: is this a valid branching target? */
7730 if (label->defined == ST_LABEL_UNKNOWN)
7732 gfc_error ("Label %d referenced at %L is never defined", label->value,
7737 if (label->defined != ST_LABEL_TARGET)
7739 gfc_error ("Statement at %L is not a valid branch target statement "
7740 "for the branch statement at %L", &label->where, &code->loc);
7744 /* Step two: make sure this branch is not a branch to itself ;-) */
7746 if (code->here == label)
7748 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7752 /* Step three: See if the label is in the same block as the
7753 branching statement. The hard work has been done by setting up
7754 the bitmap reachable_labels. */
7756 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7758 /* Check now whether there is a CRITICAL construct; if so, check
7759 whether the label is still visible outside of the CRITICAL block,
7760 which is invalid. */
7761 for (stack = cs_base; stack; stack = stack->prev)
7762 if (stack->current->op == EXEC_CRITICAL
7763 && bitmap_bit_p (stack->reachable_labels, label->value))
7764 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7765 " at %L", &code->loc, &label->where);
7770 /* Step four: If we haven't found the label in the bitmap, it may
7771 still be the label of the END of the enclosing block, in which
7772 case we find it by going up the code_stack. */
7774 for (stack = cs_base; stack; stack = stack->prev)
7776 if (stack->current->next && stack->current->next->here == label)
7778 if (stack->current->op == EXEC_CRITICAL)
7780 /* Note: A label at END CRITICAL does not leave the CRITICAL
7781 construct as END CRITICAL is still part of it. */
7782 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7783 " at %L", &code->loc, &label->where);
7790 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7794 /* The label is not in an enclosing block, so illegal. This was
7795 allowed in Fortran 66, so we allow it as extension. No
7796 further checks are necessary in this case. */
7797 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7798 "as the GOTO statement at %L", &label->where,
7804 /* Check whether EXPR1 has the same shape as EXPR2. */
7807 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7809 mpz_t shape[GFC_MAX_DIMENSIONS];
7810 mpz_t shape2[GFC_MAX_DIMENSIONS];
7811 gfc_try result = FAILURE;
7814 /* Compare the rank. */
7815 if (expr1->rank != expr2->rank)
7818 /* Compare the size of each dimension. */
7819 for (i=0; i<expr1->rank; i++)
7821 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7824 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7827 if (mpz_cmp (shape[i], shape2[i]))
7831 /* When either of the two expression is an assumed size array, we
7832 ignore the comparison of dimension sizes. */
7837 for (i--; i >= 0; i--)
7839 mpz_clear (shape[i]);
7840 mpz_clear (shape2[i]);
7846 /* Check whether a WHERE assignment target or a WHERE mask expression
7847 has the same shape as the outmost WHERE mask expression. */
7850 resolve_where (gfc_code *code, gfc_expr *mask)
7856 cblock = code->block;
7858 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7859 In case of nested WHERE, only the outmost one is stored. */
7860 if (mask == NULL) /* outmost WHERE */
7862 else /* inner WHERE */
7869 /* Check if the mask-expr has a consistent shape with the
7870 outmost WHERE mask-expr. */
7871 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7872 gfc_error ("WHERE mask at %L has inconsistent shape",
7873 &cblock->expr1->where);
7876 /* the assignment statement of a WHERE statement, or the first
7877 statement in where-body-construct of a WHERE construct */
7878 cnext = cblock->next;
7883 /* WHERE assignment statement */
7886 /* Check shape consistent for WHERE assignment target. */
7887 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7888 gfc_error ("WHERE assignment target at %L has "
7889 "inconsistent shape", &cnext->expr1->where);
7893 case EXEC_ASSIGN_CALL:
7894 resolve_call (cnext);
7895 if (!cnext->resolved_sym->attr.elemental)
7896 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7897 &cnext->ext.actual->expr->where);
7900 /* WHERE or WHERE construct is part of a where-body-construct */
7902 resolve_where (cnext, e);
7906 gfc_error ("Unsupported statement inside WHERE at %L",
7909 /* the next statement within the same where-body-construct */
7910 cnext = cnext->next;
7912 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7913 cblock = cblock->block;
7918 /* Resolve assignment in FORALL construct.
7919 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7920 FORALL index variables. */
7923 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7927 for (n = 0; n < nvar; n++)
7929 gfc_symbol *forall_index;
7931 forall_index = var_expr[n]->symtree->n.sym;
7933 /* Check whether the assignment target is one of the FORALL index
7935 if ((code->expr1->expr_type == EXPR_VARIABLE)
7936 && (code->expr1->symtree->n.sym == forall_index))
7937 gfc_error ("Assignment to a FORALL index variable at %L",
7938 &code->expr1->where);
7941 /* If one of the FORALL index variables doesn't appear in the
7942 assignment variable, then there could be a many-to-one
7943 assignment. Emit a warning rather than an error because the
7944 mask could be resolving this problem. */
7945 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7946 gfc_warning ("The FORALL with index '%s' is not used on the "
7947 "left side of the assignment at %L and so might "
7948 "cause multiple assignment to this object",
7949 var_expr[n]->symtree->name, &code->expr1->where);
7955 /* Resolve WHERE statement in FORALL construct. */
7958 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7959 gfc_expr **var_expr)
7964 cblock = code->block;
7967 /* the assignment statement of a WHERE statement, or the first
7968 statement in where-body-construct of a WHERE construct */
7969 cnext = cblock->next;
7974 /* WHERE assignment statement */
7976 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7979 /* WHERE operator assignment statement */
7980 case EXEC_ASSIGN_CALL:
7981 resolve_call (cnext);
7982 if (!cnext->resolved_sym->attr.elemental)
7983 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7984 &cnext->ext.actual->expr->where);
7987 /* WHERE or WHERE construct is part of a where-body-construct */
7989 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7993 gfc_error ("Unsupported statement inside WHERE at %L",
7996 /* the next statement within the same where-body-construct */
7997 cnext = cnext->next;
7999 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8000 cblock = cblock->block;
8005 /* Traverse the FORALL body to check whether the following errors exist:
8006 1. For assignment, check if a many-to-one assignment happens.
8007 2. For WHERE statement, check the WHERE body to see if there is any
8008 many-to-one assignment. */
8011 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8015 c = code->block->next;
8021 case EXEC_POINTER_ASSIGN:
8022 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8025 case EXEC_ASSIGN_CALL:
8029 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8030 there is no need to handle it here. */
8034 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8039 /* The next statement in the FORALL body. */
8045 /* Counts the number of iterators needed inside a forall construct, including
8046 nested forall constructs. This is used to allocate the needed memory
8047 in gfc_resolve_forall. */
8050 gfc_count_forall_iterators (gfc_code *code)
8052 int max_iters, sub_iters, current_iters;
8053 gfc_forall_iterator *fa;
8055 gcc_assert(code->op == EXEC_FORALL);
8059 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8062 code = code->block->next;
8066 if (code->op == EXEC_FORALL)
8068 sub_iters = gfc_count_forall_iterators (code);
8069 if (sub_iters > max_iters)
8070 max_iters = sub_iters;
8075 return current_iters + max_iters;
8079 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8080 gfc_resolve_forall_body to resolve the FORALL body. */
8083 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8085 static gfc_expr **var_expr;
8086 static int total_var = 0;
8087 static int nvar = 0;
8089 gfc_forall_iterator *fa;
8094 /* Start to resolve a FORALL construct */
8095 if (forall_save == 0)
8097 /* Count the total number of FORALL index in the nested FORALL
8098 construct in order to allocate the VAR_EXPR with proper size. */
8099 total_var = gfc_count_forall_iterators (code);
8101 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8102 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
8105 /* The information about FORALL iterator, including FORALL index start, end
8106 and stride. The FORALL index can not appear in start, end or stride. */
8107 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8109 /* Check if any outer FORALL index name is the same as the current
8111 for (i = 0; i < nvar; i++)
8113 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8115 gfc_error ("An outer FORALL construct already has an index "
8116 "with this name %L", &fa->var->where);
8120 /* Record the current FORALL index. */
8121 var_expr[nvar] = gfc_copy_expr (fa->var);
8125 /* No memory leak. */
8126 gcc_assert (nvar <= total_var);
8129 /* Resolve the FORALL body. */
8130 gfc_resolve_forall_body (code, nvar, var_expr);
8132 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8133 gfc_resolve_blocks (code->block, ns);
8137 /* Free only the VAR_EXPRs allocated in this frame. */
8138 for (i = nvar; i < tmp; i++)
8139 gfc_free_expr (var_expr[i]);
8143 /* We are in the outermost FORALL construct. */
8144 gcc_assert (forall_save == 0);
8146 /* VAR_EXPR is not needed any more. */
8147 gfc_free (var_expr);
8153 /* Resolve a BLOCK construct statement. */
8156 resolve_block_construct (gfc_code* code)
8158 /* For an ASSOCIATE block, the associations (and their targets) are already
8159 resolved during gfc_resolve_symbol. */
8161 /* Resolve the BLOCK's namespace. */
8162 gfc_resolve (code->ext.block.ns);
8166 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8169 static void resolve_code (gfc_code *, gfc_namespace *);
8172 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8176 for (; b; b = b->block)
8178 t = gfc_resolve_expr (b->expr1);
8179 if (gfc_resolve_expr (b->expr2) == FAILURE)
8185 if (t == SUCCESS && b->expr1 != NULL
8186 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8187 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8194 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8195 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8200 resolve_branch (b->label1, b);
8204 resolve_block_construct (b);
8208 case EXEC_SELECT_TYPE:
8219 case EXEC_OMP_ATOMIC:
8220 case EXEC_OMP_CRITICAL:
8222 case EXEC_OMP_MASTER:
8223 case EXEC_OMP_ORDERED:
8224 case EXEC_OMP_PARALLEL:
8225 case EXEC_OMP_PARALLEL_DO:
8226 case EXEC_OMP_PARALLEL_SECTIONS:
8227 case EXEC_OMP_PARALLEL_WORKSHARE:
8228 case EXEC_OMP_SECTIONS:
8229 case EXEC_OMP_SINGLE:
8231 case EXEC_OMP_TASKWAIT:
8232 case EXEC_OMP_WORKSHARE:
8236 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8239 resolve_code (b->next, ns);
8244 /* Does everything to resolve an ordinary assignment. Returns true
8245 if this is an interface assignment. */
8247 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8257 if (gfc_extend_assign (code, ns) == SUCCESS)
8261 if (code->op == EXEC_ASSIGN_CALL)
8263 lhs = code->ext.actual->expr;
8264 rhsptr = &code->ext.actual->next->expr;
8268 gfc_actual_arglist* args;
8269 gfc_typebound_proc* tbp;
8271 gcc_assert (code->op == EXEC_COMPCALL);
8273 args = code->expr1->value.compcall.actual;
8275 rhsptr = &args->next->expr;
8277 tbp = code->expr1->value.compcall.tbp;
8278 gcc_assert (!tbp->is_generic);
8281 /* Make a temporary rhs when there is a default initializer
8282 and rhs is the same symbol as the lhs. */
8283 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8284 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8285 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8286 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8287 *rhsptr = gfc_get_parentheses (*rhsptr);
8296 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8297 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8298 &code->loc) == FAILURE)
8301 /* Handle the case of a BOZ literal on the RHS. */
8302 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8305 if (gfc_option.warn_surprising)
8306 gfc_warning ("BOZ literal at %L is bitwise transferred "
8307 "non-integer symbol '%s'", &code->loc,
8308 lhs->symtree->n.sym->name);
8310 if (!gfc_convert_boz (rhs, &lhs->ts))
8312 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8314 if (rc == ARITH_UNDERFLOW)
8315 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8316 ". This check can be disabled with the option "
8317 "-fno-range-check", &rhs->where);
8318 else if (rc == ARITH_OVERFLOW)
8319 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8320 ". This check can be disabled with the option "
8321 "-fno-range-check", &rhs->where);
8322 else if (rc == ARITH_NAN)
8323 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8324 ". This check can be disabled with the option "
8325 "-fno-range-check", &rhs->where);
8331 if (lhs->ts.type == BT_CHARACTER
8332 && gfc_option.warn_character_truncation)
8334 if (lhs->ts.u.cl != NULL
8335 && lhs->ts.u.cl->length != NULL
8336 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8337 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8339 if (rhs->expr_type == EXPR_CONSTANT)
8340 rlen = rhs->value.character.length;
8342 else if (rhs->ts.u.cl != NULL
8343 && rhs->ts.u.cl->length != NULL
8344 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8345 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8347 if (rlen && llen && rlen > llen)
8348 gfc_warning_now ("CHARACTER expression will be truncated "
8349 "in assignment (%d/%d) at %L",
8350 llen, rlen, &code->loc);
8353 /* Ensure that a vector index expression for the lvalue is evaluated
8354 to a temporary if the lvalue symbol is referenced in it. */
8357 for (ref = lhs->ref; ref; ref= ref->next)
8358 if (ref->type == REF_ARRAY)
8360 for (n = 0; n < ref->u.ar.dimen; n++)
8361 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8362 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8363 ref->u.ar.start[n]))
8365 = gfc_get_parentheses (ref->u.ar.start[n]);
8369 if (gfc_pure (NULL))
8371 if (gfc_impure_variable (lhs->symtree->n.sym))
8373 gfc_error ("Cannot assign to variable '%s' in PURE "
8375 lhs->symtree->n.sym->name,
8380 if (lhs->ts.type == BT_DERIVED
8381 && lhs->expr_type == EXPR_VARIABLE
8382 && lhs->ts.u.derived->attr.pointer_comp
8383 && rhs->expr_type == EXPR_VARIABLE
8384 && (gfc_impure_variable (rhs->symtree->n.sym)
8385 || gfc_is_coindexed (rhs)))
8388 if (gfc_is_coindexed (rhs))
8389 gfc_error ("Coindexed expression at %L is assigned to "
8390 "a derived type variable with a POINTER "
8391 "component in a PURE procedure",
8394 gfc_error ("The impure variable at %L is assigned to "
8395 "a derived type variable with a POINTER "
8396 "component in a PURE procedure (12.6)",
8401 /* Fortran 2008, C1283. */
8402 if (gfc_is_coindexed (lhs))
8404 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8405 "procedure", &rhs->where);
8411 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8412 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8413 if (lhs->ts.type == BT_CLASS)
8415 gfc_error ("Variable must not be polymorphic in assignment at %L",
8420 /* F2008, Section 7.2.1.2. */
8421 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8423 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8424 "component in assignment at %L", &lhs->where);
8428 gfc_check_assign (lhs, rhs, 1);
8433 /* Given a block of code, recursively resolve everything pointed to by this
8437 resolve_code (gfc_code *code, gfc_namespace *ns)
8439 int omp_workshare_save;
8444 frame.prev = cs_base;
8448 find_reachable_labels (code);
8450 for (; code; code = code->next)
8452 frame.current = code;
8453 forall_save = forall_flag;
8455 if (code->op == EXEC_FORALL)
8458 gfc_resolve_forall (code, ns, forall_save);
8461 else if (code->block)
8463 omp_workshare_save = -1;
8466 case EXEC_OMP_PARALLEL_WORKSHARE:
8467 omp_workshare_save = omp_workshare_flag;
8468 omp_workshare_flag = 1;
8469 gfc_resolve_omp_parallel_blocks (code, ns);
8471 case EXEC_OMP_PARALLEL:
8472 case EXEC_OMP_PARALLEL_DO:
8473 case EXEC_OMP_PARALLEL_SECTIONS:
8475 omp_workshare_save = omp_workshare_flag;
8476 omp_workshare_flag = 0;
8477 gfc_resolve_omp_parallel_blocks (code, ns);
8480 gfc_resolve_omp_do_blocks (code, ns);
8482 case EXEC_SELECT_TYPE:
8483 gfc_current_ns = code->ext.block.ns;
8484 gfc_resolve_blocks (code->block, gfc_current_ns);
8485 gfc_current_ns = ns;
8487 case EXEC_OMP_WORKSHARE:
8488 omp_workshare_save = omp_workshare_flag;
8489 omp_workshare_flag = 1;
8492 gfc_resolve_blocks (code->block, ns);
8496 if (omp_workshare_save != -1)
8497 omp_workshare_flag = omp_workshare_save;
8501 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8502 t = gfc_resolve_expr (code->expr1);
8503 forall_flag = forall_save;
8505 if (gfc_resolve_expr (code->expr2) == FAILURE)
8508 if (code->op == EXEC_ALLOCATE
8509 && gfc_resolve_expr (code->expr3) == FAILURE)
8515 case EXEC_END_BLOCK:
8519 case EXEC_ERROR_STOP:
8523 case EXEC_ASSIGN_CALL:
8528 case EXEC_SYNC_IMAGES:
8529 case EXEC_SYNC_MEMORY:
8530 resolve_sync (code);
8534 /* Keep track of which entry we are up to. */
8535 current_entry_id = code->ext.entry->id;
8539 resolve_where (code, NULL);
8543 if (code->expr1 != NULL)
8545 if (code->expr1->ts.type != BT_INTEGER)
8546 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8547 "INTEGER variable", &code->expr1->where);
8548 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8549 gfc_error ("Variable '%s' has not been assigned a target "
8550 "label at %L", code->expr1->symtree->n.sym->name,
8551 &code->expr1->where);
8554 resolve_branch (code->label1, code);
8558 if (code->expr1 != NULL
8559 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8560 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8561 "INTEGER return specifier", &code->expr1->where);
8564 case EXEC_INIT_ASSIGN:
8565 case EXEC_END_PROCEDURE:
8572 if (resolve_ordinary_assign (code, ns))
8574 if (code->op == EXEC_COMPCALL)
8581 case EXEC_LABEL_ASSIGN:
8582 if (code->label1->defined == ST_LABEL_UNKNOWN)
8583 gfc_error ("Label %d referenced at %L is never defined",
8584 code->label1->value, &code->label1->where);
8586 && (code->expr1->expr_type != EXPR_VARIABLE
8587 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8588 || code->expr1->symtree->n.sym->ts.kind
8589 != gfc_default_integer_kind
8590 || code->expr1->symtree->n.sym->as != NULL))
8591 gfc_error ("ASSIGN statement at %L requires a scalar "
8592 "default INTEGER variable", &code->expr1->where);
8595 case EXEC_POINTER_ASSIGN:
8599 gfc_check_pointer_assign (code->expr1, code->expr2);
8602 case EXEC_ARITHMETIC_IF:
8604 && code->expr1->ts.type != BT_INTEGER
8605 && code->expr1->ts.type != BT_REAL)
8606 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8607 "expression", &code->expr1->where);
8609 resolve_branch (code->label1, code);
8610 resolve_branch (code->label2, code);
8611 resolve_branch (code->label3, code);
8615 if (t == SUCCESS && code->expr1 != NULL
8616 && (code->expr1->ts.type != BT_LOGICAL
8617 || code->expr1->rank != 0))
8618 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8619 &code->expr1->where);
8624 resolve_call (code);
8629 resolve_typebound_subroutine (code);
8633 resolve_ppc_call (code);
8637 /* Select is complicated. Also, a SELECT construct could be
8638 a transformed computed GOTO. */
8639 resolve_select (code);
8642 case EXEC_SELECT_TYPE:
8643 resolve_select_type (code);
8647 gfc_resolve (code->ext.block.ns);
8651 if (code->ext.iterator != NULL)
8653 gfc_iterator *iter = code->ext.iterator;
8654 if (gfc_resolve_iterator (iter, true) != FAILURE)
8655 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8660 if (code->expr1 == NULL)
8661 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8663 && (code->expr1->rank != 0
8664 || code->expr1->ts.type != BT_LOGICAL))
8665 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8666 "a scalar LOGICAL expression", &code->expr1->where);
8671 resolve_allocate_deallocate (code, "ALLOCATE");
8675 case EXEC_DEALLOCATE:
8677 resolve_allocate_deallocate (code, "DEALLOCATE");
8682 if (gfc_resolve_open (code->ext.open) == FAILURE)
8685 resolve_branch (code->ext.open->err, code);
8689 if (gfc_resolve_close (code->ext.close) == FAILURE)
8692 resolve_branch (code->ext.close->err, code);
8695 case EXEC_BACKSPACE:
8699 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8702 resolve_branch (code->ext.filepos->err, code);
8706 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8709 resolve_branch (code->ext.inquire->err, code);
8713 gcc_assert (code->ext.inquire != NULL);
8714 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8717 resolve_branch (code->ext.inquire->err, code);
8721 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8724 resolve_branch (code->ext.wait->err, code);
8725 resolve_branch (code->ext.wait->end, code);
8726 resolve_branch (code->ext.wait->eor, code);
8731 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8734 resolve_branch (code->ext.dt->err, code);
8735 resolve_branch (code->ext.dt->end, code);
8736 resolve_branch (code->ext.dt->eor, code);
8740 resolve_transfer (code);
8744 resolve_forall_iterators (code->ext.forall_iterator);
8746 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8747 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8748 "expression", &code->expr1->where);
8751 case EXEC_OMP_ATOMIC:
8752 case EXEC_OMP_BARRIER:
8753 case EXEC_OMP_CRITICAL:
8754 case EXEC_OMP_FLUSH:
8756 case EXEC_OMP_MASTER:
8757 case EXEC_OMP_ORDERED:
8758 case EXEC_OMP_SECTIONS:
8759 case EXEC_OMP_SINGLE:
8760 case EXEC_OMP_TASKWAIT:
8761 case EXEC_OMP_WORKSHARE:
8762 gfc_resolve_omp_directive (code, ns);
8765 case EXEC_OMP_PARALLEL:
8766 case EXEC_OMP_PARALLEL_DO:
8767 case EXEC_OMP_PARALLEL_SECTIONS:
8768 case EXEC_OMP_PARALLEL_WORKSHARE:
8770 omp_workshare_save = omp_workshare_flag;
8771 omp_workshare_flag = 0;
8772 gfc_resolve_omp_directive (code, ns);
8773 omp_workshare_flag = omp_workshare_save;
8777 gfc_internal_error ("resolve_code(): Bad statement code");
8781 cs_base = frame.prev;
8785 /* Resolve initial values and make sure they are compatible with
8789 resolve_values (gfc_symbol *sym)
8791 if (sym->value == NULL)
8794 if (gfc_resolve_expr (sym->value) == FAILURE)
8797 gfc_check_assign_symbol (sym, sym->value);
8801 /* Verify the binding labels for common blocks that are BIND(C). The label
8802 for a BIND(C) common block must be identical in all scoping units in which
8803 the common block is declared. Further, the binding label can not collide
8804 with any other global entity in the program. */
8807 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8809 if (comm_block_tree->n.common->is_bind_c == 1)
8811 gfc_gsymbol *binding_label_gsym;
8812 gfc_gsymbol *comm_name_gsym;
8814 /* See if a global symbol exists by the common block's name. It may
8815 be NULL if the common block is use-associated. */
8816 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8817 comm_block_tree->n.common->name);
8818 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8819 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8820 "with the global entity '%s' at %L",
8821 comm_block_tree->n.common->binding_label,
8822 comm_block_tree->n.common->name,
8823 &(comm_block_tree->n.common->where),
8824 comm_name_gsym->name, &(comm_name_gsym->where));
8825 else if (comm_name_gsym != NULL
8826 && strcmp (comm_name_gsym->name,
8827 comm_block_tree->n.common->name) == 0)
8829 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8831 if (comm_name_gsym->binding_label == NULL)
8832 /* No binding label for common block stored yet; save this one. */
8833 comm_name_gsym->binding_label =
8834 comm_block_tree->n.common->binding_label;
8836 if (strcmp (comm_name_gsym->binding_label,
8837 comm_block_tree->n.common->binding_label) != 0)
8839 /* Common block names match but binding labels do not. */
8840 gfc_error ("Binding label '%s' for common block '%s' at %L "
8841 "does not match the binding label '%s' for common "
8843 comm_block_tree->n.common->binding_label,
8844 comm_block_tree->n.common->name,
8845 &(comm_block_tree->n.common->where),
8846 comm_name_gsym->binding_label,
8847 comm_name_gsym->name,
8848 &(comm_name_gsym->where));
8853 /* There is no binding label (NAME="") so we have nothing further to
8854 check and nothing to add as a global symbol for the label. */
8855 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8858 binding_label_gsym =
8859 gfc_find_gsymbol (gfc_gsym_root,
8860 comm_block_tree->n.common->binding_label);
8861 if (binding_label_gsym == NULL)
8863 /* Need to make a global symbol for the binding label to prevent
8864 it from colliding with another. */
8865 binding_label_gsym =
8866 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8867 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8868 binding_label_gsym->type = GSYM_COMMON;
8872 /* If comm_name_gsym is NULL, the name common block is use
8873 associated and the name could be colliding. */
8874 if (binding_label_gsym->type != GSYM_COMMON)
8875 gfc_error ("Binding label '%s' for common block '%s' at %L "
8876 "collides with the global entity '%s' at %L",
8877 comm_block_tree->n.common->binding_label,
8878 comm_block_tree->n.common->name,
8879 &(comm_block_tree->n.common->where),
8880 binding_label_gsym->name,
8881 &(binding_label_gsym->where));
8882 else if (comm_name_gsym != NULL
8883 && (strcmp (binding_label_gsym->name,
8884 comm_name_gsym->binding_label) != 0)
8885 && (strcmp (binding_label_gsym->sym_name,
8886 comm_name_gsym->name) != 0))
8887 gfc_error ("Binding label '%s' for common block '%s' at %L "
8888 "collides with global entity '%s' at %L",
8889 binding_label_gsym->name, binding_label_gsym->sym_name,
8890 &(comm_block_tree->n.common->where),
8891 comm_name_gsym->name, &(comm_name_gsym->where));
8899 /* Verify any BIND(C) derived types in the namespace so we can report errors
8900 for them once, rather than for each variable declared of that type. */
8903 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8905 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8906 && derived_sym->attr.is_bind_c == 1)
8907 verify_bind_c_derived_type (derived_sym);
8913 /* Verify that any binding labels used in a given namespace do not collide
8914 with the names or binding labels of any global symbols. */
8917 gfc_verify_binding_labels (gfc_symbol *sym)
8921 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8922 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8924 gfc_gsymbol *bind_c_sym;
8926 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8927 if (bind_c_sym != NULL
8928 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8930 if (sym->attr.if_source == IFSRC_DECL
8931 && (bind_c_sym->type != GSYM_SUBROUTINE
8932 && bind_c_sym->type != GSYM_FUNCTION)
8933 && ((sym->attr.contained == 1
8934 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8935 || (sym->attr.use_assoc == 1
8936 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8938 /* Make sure global procedures don't collide with anything. */
8939 gfc_error ("Binding label '%s' at %L collides with the global "
8940 "entity '%s' at %L", sym->binding_label,
8941 &(sym->declared_at), bind_c_sym->name,
8942 &(bind_c_sym->where));
8945 else if (sym->attr.contained == 0
8946 && (sym->attr.if_source == IFSRC_IFBODY
8947 && sym->attr.flavor == FL_PROCEDURE)
8948 && (bind_c_sym->sym_name != NULL
8949 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8951 /* Make sure procedures in interface bodies don't collide. */
8952 gfc_error ("Binding label '%s' in interface body at %L collides "
8953 "with the global entity '%s' at %L",
8955 &(sym->declared_at), bind_c_sym->name,
8956 &(bind_c_sym->where));
8959 else if (sym->attr.contained == 0
8960 && sym->attr.if_source == IFSRC_UNKNOWN)
8961 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8962 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8963 || sym->attr.use_assoc == 0)
8965 gfc_error ("Binding label '%s' at %L collides with global "
8966 "entity '%s' at %L", sym->binding_label,
8967 &(sym->declared_at), bind_c_sym->name,
8968 &(bind_c_sym->where));
8973 /* Clear the binding label to prevent checking multiple times. */
8974 sym->binding_label[0] = '\0';
8976 else if (bind_c_sym == NULL)
8978 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8979 bind_c_sym->where = sym->declared_at;
8980 bind_c_sym->sym_name = sym->name;
8982 if (sym->attr.use_assoc == 1)
8983 bind_c_sym->mod_name = sym->module;
8985 if (sym->ns->proc_name != NULL)
8986 bind_c_sym->mod_name = sym->ns->proc_name->name;
8988 if (sym->attr.contained == 0)
8990 if (sym->attr.subroutine)
8991 bind_c_sym->type = GSYM_SUBROUTINE;
8992 else if (sym->attr.function)
8993 bind_c_sym->type = GSYM_FUNCTION;
9001 /* Resolve an index expression. */
9004 resolve_index_expr (gfc_expr *e)
9006 if (gfc_resolve_expr (e) == FAILURE)
9009 if (gfc_simplify_expr (e, 0) == FAILURE)
9012 if (gfc_specification_expr (e) == FAILURE)
9018 /* Resolve a charlen structure. */
9021 resolve_charlen (gfc_charlen *cl)
9030 specification_expr = 1;
9032 if (resolve_index_expr (cl->length) == FAILURE)
9034 specification_expr = 0;
9038 /* "If the character length parameter value evaluates to a negative
9039 value, the length of character entities declared is zero." */
9040 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9042 if (gfc_option.warn_surprising)
9043 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9044 " the length has been set to zero",
9045 &cl->length->where, i);
9046 gfc_replace_expr (cl->length,
9047 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9050 /* Check that the character length is not too large. */
9051 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9052 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9053 && cl->length->ts.type == BT_INTEGER
9054 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9056 gfc_error ("String length at %L is too large", &cl->length->where);
9064 /* Test for non-constant shape arrays. */
9067 is_non_constant_shape_array (gfc_symbol *sym)
9073 not_constant = false;
9074 if (sym->as != NULL)
9076 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9077 has not been simplified; parameter array references. Do the
9078 simplification now. */
9079 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9081 e = sym->as->lower[i];
9082 if (e && (resolve_index_expr (e) == FAILURE
9083 || !gfc_is_constant_expr (e)))
9084 not_constant = true;
9085 e = sym->as->upper[i];
9086 if (e && (resolve_index_expr (e) == FAILURE
9087 || !gfc_is_constant_expr (e)))
9088 not_constant = true;
9091 return not_constant;
9094 /* Given a symbol and an initialization expression, add code to initialize
9095 the symbol to the function entry. */
9097 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9101 gfc_namespace *ns = sym->ns;
9103 /* Search for the function namespace if this is a contained
9104 function without an explicit result. */
9105 if (sym->attr.function && sym == sym->result
9106 && sym->name != sym->ns->proc_name->name)
9109 for (;ns; ns = ns->sibling)
9110 if (strcmp (ns->proc_name->name, sym->name) == 0)
9116 gfc_free_expr (init);
9120 /* Build an l-value expression for the result. */
9121 lval = gfc_lval_expr_from_sym (sym);
9123 /* Add the code at scope entry. */
9124 init_st = gfc_get_code ();
9125 init_st->next = ns->code;
9128 /* Assign the default initializer to the l-value. */
9129 init_st->loc = sym->declared_at;
9130 init_st->op = EXEC_INIT_ASSIGN;
9131 init_st->expr1 = lval;
9132 init_st->expr2 = init;
9135 /* Assign the default initializer to a derived type variable or result. */
9138 apply_default_init (gfc_symbol *sym)
9140 gfc_expr *init = NULL;
9142 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9145 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9146 init = gfc_default_initializer (&sym->ts);
9151 build_init_assign (sym, init);
9154 /* Build an initializer for a local integer, real, complex, logical, or
9155 character variable, based on the command line flags finit-local-zero,
9156 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9157 null if the symbol should not have a default initialization. */
9159 build_default_init_expr (gfc_symbol *sym)
9162 gfc_expr *init_expr;
9165 /* These symbols should never have a default initialization. */
9166 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9167 || sym->attr.external
9169 || sym->attr.pointer
9170 || sym->attr.in_equivalence
9171 || sym->attr.in_common
9174 || sym->attr.cray_pointee
9175 || sym->attr.cray_pointer)
9178 /* Now we'll try to build an initializer expression. */
9179 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9182 /* We will only initialize integers, reals, complex, logicals, and
9183 characters, and only if the corresponding command-line flags
9184 were set. Otherwise, we free init_expr and return null. */
9185 switch (sym->ts.type)
9188 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9189 mpz_set_si (init_expr->value.integer,
9190 gfc_option.flag_init_integer_value);
9193 gfc_free_expr (init_expr);
9199 switch (gfc_option.flag_init_real)
9201 case GFC_INIT_REAL_SNAN:
9202 init_expr->is_snan = 1;
9204 case GFC_INIT_REAL_NAN:
9205 mpfr_set_nan (init_expr->value.real);
9208 case GFC_INIT_REAL_INF:
9209 mpfr_set_inf (init_expr->value.real, 1);
9212 case GFC_INIT_REAL_NEG_INF:
9213 mpfr_set_inf (init_expr->value.real, -1);
9216 case GFC_INIT_REAL_ZERO:
9217 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9221 gfc_free_expr (init_expr);
9228 switch (gfc_option.flag_init_real)
9230 case GFC_INIT_REAL_SNAN:
9231 init_expr->is_snan = 1;
9233 case GFC_INIT_REAL_NAN:
9234 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9235 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9238 case GFC_INIT_REAL_INF:
9239 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9240 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9243 case GFC_INIT_REAL_NEG_INF:
9244 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9245 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9248 case GFC_INIT_REAL_ZERO:
9249 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9253 gfc_free_expr (init_expr);
9260 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9261 init_expr->value.logical = 0;
9262 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9263 init_expr->value.logical = 1;
9266 gfc_free_expr (init_expr);
9272 /* For characters, the length must be constant in order to
9273 create a default initializer. */
9274 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9275 && sym->ts.u.cl->length
9276 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9278 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9279 init_expr->value.character.length = char_len;
9280 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9281 for (i = 0; i < char_len; i++)
9282 init_expr->value.character.string[i]
9283 = (unsigned char) gfc_option.flag_init_character_value;
9287 gfc_free_expr (init_expr);
9293 gfc_free_expr (init_expr);
9299 /* Add an initialization expression to a local variable. */
9301 apply_default_init_local (gfc_symbol *sym)
9303 gfc_expr *init = NULL;
9305 /* The symbol should be a variable or a function return value. */
9306 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9307 || (sym->attr.function && sym->result != sym))
9310 /* Try to build the initializer expression. If we can't initialize
9311 this symbol, then init will be NULL. */
9312 init = build_default_init_expr (sym);
9316 /* For saved variables, we don't want to add an initializer at
9317 function entry, so we just add a static initializer. */
9318 if (sym->attr.save || sym->ns->save_all
9319 || gfc_option.flag_max_stack_var_size == 0)
9321 /* Don't clobber an existing initializer! */
9322 gcc_assert (sym->value == NULL);
9327 build_init_assign (sym, init);
9330 /* Resolution of common features of flavors variable and procedure. */
9333 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9335 /* Constraints on deferred shape variable. */
9336 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9338 if (sym->attr.allocatable)
9340 if (sym->attr.dimension)
9342 gfc_error ("Allocatable array '%s' at %L must have "
9343 "a deferred shape", sym->name, &sym->declared_at);
9346 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9347 "may not be ALLOCATABLE", sym->name,
9348 &sym->declared_at) == FAILURE)
9352 if (sym->attr.pointer && sym->attr.dimension)
9354 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9355 sym->name, &sym->declared_at);
9362 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9363 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9365 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9366 sym->name, &sym->declared_at);
9371 /* Constraints on polymorphic variables. */
9372 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9375 if (sym->attr.class_ok
9376 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9378 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9379 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9385 /* Assume that use associated symbols were checked in the module ns. */
9386 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9388 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9389 "or pointer", sym->name, &sym->declared_at);
9398 /* Additional checks for symbols with flavor variable and derived
9399 type. To be called from resolve_fl_variable. */
9402 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9404 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9406 /* Check to see if a derived type is blocked from being host
9407 associated by the presence of another class I symbol in the same
9408 namespace. 14.6.1.3 of the standard and the discussion on
9409 comp.lang.fortran. */
9410 if (sym->ns != sym->ts.u.derived->ns
9411 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9414 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9415 if (s && s->attr.flavor != FL_DERIVED)
9417 gfc_error ("The type '%s' cannot be host associated at %L "
9418 "because it is blocked by an incompatible object "
9419 "of the same name declared at %L",
9420 sym->ts.u.derived->name, &sym->declared_at,
9426 /* 4th constraint in section 11.3: "If an object of a type for which
9427 component-initialization is specified (R429) appears in the
9428 specification-part of a module and does not have the ALLOCATABLE
9429 or POINTER attribute, the object shall have the SAVE attribute."
9431 The check for initializers is performed with
9432 gfc_has_default_initializer because gfc_default_initializer generates
9433 a hidden default for allocatable components. */
9434 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9435 && sym->ns->proc_name->attr.flavor == FL_MODULE
9436 && !sym->ns->save_all && !sym->attr.save
9437 && !sym->attr.pointer && !sym->attr.allocatable
9438 && gfc_has_default_initializer (sym->ts.u.derived)
9439 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9440 "module variable '%s' at %L, needed due to "
9441 "the default initialization", sym->name,
9442 &sym->declared_at) == FAILURE)
9445 /* Assign default initializer. */
9446 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9447 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9449 sym->value = gfc_default_initializer (&sym->ts);
9456 /* Resolve symbols with flavor variable. */
9459 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9461 int no_init_flag, automatic_flag;
9463 const char *auto_save_msg;
9465 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9468 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9471 /* Set this flag to check that variables are parameters of all entries.
9472 This check is effected by the call to gfc_resolve_expr through
9473 is_non_constant_shape_array. */
9474 specification_expr = 1;
9476 if (sym->ns->proc_name
9477 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9478 || sym->ns->proc_name->attr.is_main_program)
9479 && !sym->attr.use_assoc
9480 && !sym->attr.allocatable
9481 && !sym->attr.pointer
9482 && is_non_constant_shape_array (sym))
9484 /* The shape of a main program or module array needs to be
9486 gfc_error ("The module or main program array '%s' at %L must "
9487 "have constant shape", sym->name, &sym->declared_at);
9488 specification_expr = 0;
9492 if (sym->ts.type == BT_CHARACTER)
9494 /* Make sure that character string variables with assumed length are
9496 e = sym->ts.u.cl->length;
9497 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9499 gfc_error ("Entity with assumed character length at %L must be a "
9500 "dummy argument or a PARAMETER", &sym->declared_at);
9504 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9506 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9510 if (!gfc_is_constant_expr (e)
9511 && !(e->expr_type == EXPR_VARIABLE
9512 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9513 && sym->ns->proc_name
9514 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9515 || sym->ns->proc_name->attr.is_main_program)
9516 && !sym->attr.use_assoc)
9518 gfc_error ("'%s' at %L must have constant character length "
9519 "in this context", sym->name, &sym->declared_at);
9524 if (sym->value == NULL && sym->attr.referenced)
9525 apply_default_init_local (sym); /* Try to apply a default initialization. */
9527 /* Determine if the symbol may not have an initializer. */
9528 no_init_flag = automatic_flag = 0;
9529 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9530 || sym->attr.intrinsic || sym->attr.result)
9532 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9533 && is_non_constant_shape_array (sym))
9535 no_init_flag = automatic_flag = 1;
9537 /* Also, they must not have the SAVE attribute.
9538 SAVE_IMPLICIT is checked below. */
9539 if (sym->attr.save == SAVE_EXPLICIT)
9541 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9546 /* Ensure that any initializer is simplified. */
9548 gfc_simplify_expr (sym->value, 1);
9550 /* Reject illegal initializers. */
9551 if (!sym->mark && sym->value)
9553 if (sym->attr.allocatable)
9554 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9555 sym->name, &sym->declared_at);
9556 else if (sym->attr.external)
9557 gfc_error ("External '%s' at %L cannot have an initializer",
9558 sym->name, &sym->declared_at);
9559 else if (sym->attr.dummy
9560 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9561 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9562 sym->name, &sym->declared_at);
9563 else if (sym->attr.intrinsic)
9564 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9565 sym->name, &sym->declared_at);
9566 else if (sym->attr.result)
9567 gfc_error ("Function result '%s' at %L cannot have an initializer",
9568 sym->name, &sym->declared_at);
9569 else if (automatic_flag)
9570 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9571 sym->name, &sym->declared_at);
9578 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9579 return resolve_fl_variable_derived (sym, no_init_flag);
9585 /* Resolve a procedure. */
9588 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9590 gfc_formal_arglist *arg;
9592 if (sym->attr.function
9593 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9596 if (sym->ts.type == BT_CHARACTER)
9598 gfc_charlen *cl = sym->ts.u.cl;
9600 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9601 && resolve_charlen (cl) == FAILURE)
9604 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9605 && sym->attr.proc == PROC_ST_FUNCTION)
9607 gfc_error ("Character-valued statement function '%s' at %L must "
9608 "have constant length", sym->name, &sym->declared_at);
9613 /* Ensure that derived type for are not of a private type. Internal
9614 module procedures are excluded by 2.2.3.3 - i.e., they are not
9615 externally accessible and can access all the objects accessible in
9617 if (!(sym->ns->parent
9618 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9619 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9621 gfc_interface *iface;
9623 for (arg = sym->formal; arg; arg = arg->next)
9626 && arg->sym->ts.type == BT_DERIVED
9627 && !arg->sym->ts.u.derived->attr.use_assoc
9628 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9629 arg->sym->ts.u.derived->ns->default_access)
9630 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9631 "PRIVATE type and cannot be a dummy argument"
9632 " of '%s', which is PUBLIC at %L",
9633 arg->sym->name, sym->name, &sym->declared_at)
9636 /* Stop this message from recurring. */
9637 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9642 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9643 PRIVATE to the containing module. */
9644 for (iface = sym->generic; iface; iface = iface->next)
9646 for (arg = iface->sym->formal; arg; arg = arg->next)
9649 && arg->sym->ts.type == BT_DERIVED
9650 && !arg->sym->ts.u.derived->attr.use_assoc
9651 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9652 arg->sym->ts.u.derived->ns->default_access)
9653 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9654 "'%s' in PUBLIC interface '%s' at %L "
9655 "takes dummy arguments of '%s' which is "
9656 "PRIVATE", iface->sym->name, sym->name,
9657 &iface->sym->declared_at,
9658 gfc_typename (&arg->sym->ts)) == FAILURE)
9660 /* Stop this message from recurring. */
9661 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9667 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9668 PRIVATE to the containing module. */
9669 for (iface = sym->generic; iface; iface = iface->next)
9671 for (arg = iface->sym->formal; arg; arg = arg->next)
9674 && arg->sym->ts.type == BT_DERIVED
9675 && !arg->sym->ts.u.derived->attr.use_assoc
9676 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9677 arg->sym->ts.u.derived->ns->default_access)
9678 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9679 "'%s' in PUBLIC interface '%s' at %L "
9680 "takes dummy arguments of '%s' which is "
9681 "PRIVATE", iface->sym->name, sym->name,
9682 &iface->sym->declared_at,
9683 gfc_typename (&arg->sym->ts)) == FAILURE)
9685 /* Stop this message from recurring. */
9686 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9693 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9694 && !sym->attr.proc_pointer)
9696 gfc_error ("Function '%s' at %L cannot have an initializer",
9697 sym->name, &sym->declared_at);
9701 /* An external symbol may not have an initializer because it is taken to be
9702 a procedure. Exception: Procedure Pointers. */
9703 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9705 gfc_error ("External object '%s' at %L may not have an initializer",
9706 sym->name, &sym->declared_at);
9710 /* An elemental function is required to return a scalar 12.7.1 */
9711 if (sym->attr.elemental && sym->attr.function && sym->as)
9713 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9714 "result", sym->name, &sym->declared_at);
9715 /* Reset so that the error only occurs once. */
9716 sym->attr.elemental = 0;
9720 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9721 char-len-param shall not be array-valued, pointer-valued, recursive
9722 or pure. ....snip... A character value of * may only be used in the
9723 following ways: (i) Dummy arg of procedure - dummy associates with
9724 actual length; (ii) To declare a named constant; or (iii) External
9725 function - but length must be declared in calling scoping unit. */
9726 if (sym->attr.function
9727 && sym->ts.type == BT_CHARACTER
9728 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9730 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9731 || (sym->attr.recursive) || (sym->attr.pure))
9733 if (sym->as && sym->as->rank)
9734 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9735 "array-valued", sym->name, &sym->declared_at);
9737 if (sym->attr.pointer)
9738 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9739 "pointer-valued", sym->name, &sym->declared_at);
9742 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9743 "pure", sym->name, &sym->declared_at);
9745 if (sym->attr.recursive)
9746 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9747 "recursive", sym->name, &sym->declared_at);
9752 /* Appendix B.2 of the standard. Contained functions give an
9753 error anyway. Fixed-form is likely to be F77/legacy. */
9754 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9755 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9756 "CHARACTER(*) function '%s' at %L",
9757 sym->name, &sym->declared_at);
9760 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9762 gfc_formal_arglist *curr_arg;
9763 int has_non_interop_arg = 0;
9765 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9766 sym->common_block) == FAILURE)
9768 /* Clear these to prevent looking at them again if there was an
9770 sym->attr.is_bind_c = 0;
9771 sym->attr.is_c_interop = 0;
9772 sym->ts.is_c_interop = 0;
9776 /* So far, no errors have been found. */
9777 sym->attr.is_c_interop = 1;
9778 sym->ts.is_c_interop = 1;
9781 curr_arg = sym->formal;
9782 while (curr_arg != NULL)
9784 /* Skip implicitly typed dummy args here. */
9785 if (curr_arg->sym->attr.implicit_type == 0)
9786 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9787 /* If something is found to fail, record the fact so we
9788 can mark the symbol for the procedure as not being
9789 BIND(C) to try and prevent multiple errors being
9791 has_non_interop_arg = 1;
9793 curr_arg = curr_arg->next;
9796 /* See if any of the arguments were not interoperable and if so, clear
9797 the procedure symbol to prevent duplicate error messages. */
9798 if (has_non_interop_arg != 0)
9800 sym->attr.is_c_interop = 0;
9801 sym->ts.is_c_interop = 0;
9802 sym->attr.is_bind_c = 0;
9806 if (!sym->attr.proc_pointer)
9808 if (sym->attr.save == SAVE_EXPLICIT)
9810 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9811 "in '%s' at %L", sym->name, &sym->declared_at);
9814 if (sym->attr.intent)
9816 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9817 "in '%s' at %L", sym->name, &sym->declared_at);
9820 if (sym->attr.subroutine && sym->attr.result)
9822 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9823 "in '%s' at %L", sym->name, &sym->declared_at);
9826 if (sym->attr.external && sym->attr.function
9827 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9828 || sym->attr.contained))
9830 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9831 "in '%s' at %L", sym->name, &sym->declared_at);
9834 if (strcmp ("ppr@", sym->name) == 0)
9836 gfc_error ("Procedure pointer result '%s' at %L "
9837 "is missing the pointer attribute",
9838 sym->ns->proc_name->name, &sym->declared_at);
9847 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9848 been defined and we now know their defined arguments, check that they fulfill
9849 the requirements of the standard for procedures used as finalizers. */
9852 gfc_resolve_finalizers (gfc_symbol* derived)
9854 gfc_finalizer* list;
9855 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9856 gfc_try result = SUCCESS;
9857 bool seen_scalar = false;
9859 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9862 /* Walk over the list of finalizer-procedures, check them, and if any one
9863 does not fit in with the standard's definition, print an error and remove
9864 it from the list. */
9865 prev_link = &derived->f2k_derived->finalizers;
9866 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9872 /* Skip this finalizer if we already resolved it. */
9873 if (list->proc_tree)
9875 prev_link = &(list->next);
9879 /* Check this exists and is a SUBROUTINE. */
9880 if (!list->proc_sym->attr.subroutine)
9882 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9883 list->proc_sym->name, &list->where);
9887 /* We should have exactly one argument. */
9888 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9890 gfc_error ("FINAL procedure at %L must have exactly one argument",
9894 arg = list->proc_sym->formal->sym;
9896 /* This argument must be of our type. */
9897 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9899 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9900 &arg->declared_at, derived->name);
9904 /* It must neither be a pointer nor allocatable nor optional. */
9905 if (arg->attr.pointer)
9907 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9911 if (arg->attr.allocatable)
9913 gfc_error ("Argument of FINAL procedure at %L must not be"
9914 " ALLOCATABLE", &arg->declared_at);
9917 if (arg->attr.optional)
9919 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9924 /* It must not be INTENT(OUT). */
9925 if (arg->attr.intent == INTENT_OUT)
9927 gfc_error ("Argument of FINAL procedure at %L must not be"
9928 " INTENT(OUT)", &arg->declared_at);
9932 /* Warn if the procedure is non-scalar and not assumed shape. */
9933 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9934 && arg->as->type != AS_ASSUMED_SHAPE)
9935 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9936 " shape argument", &arg->declared_at);
9938 /* Check that it does not match in kind and rank with a FINAL procedure
9939 defined earlier. To really loop over the *earlier* declarations,
9940 we need to walk the tail of the list as new ones were pushed at the
9942 /* TODO: Handle kind parameters once they are implemented. */
9943 my_rank = (arg->as ? arg->as->rank : 0);
9944 for (i = list->next; i; i = i->next)
9946 /* Argument list might be empty; that is an error signalled earlier,
9947 but we nevertheless continued resolving. */
9948 if (i->proc_sym->formal)
9950 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9951 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9952 if (i_rank == my_rank)
9954 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9955 " rank (%d) as '%s'",
9956 list->proc_sym->name, &list->where, my_rank,
9963 /* Is this the/a scalar finalizer procedure? */
9964 if (!arg->as || arg->as->rank == 0)
9967 /* Find the symtree for this procedure. */
9968 gcc_assert (!list->proc_tree);
9969 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9971 prev_link = &list->next;
9974 /* Remove wrong nodes immediately from the list so we don't risk any
9975 troubles in the future when they might fail later expectations. */
9979 *prev_link = list->next;
9980 gfc_free_finalizer (i);
9983 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9984 were nodes in the list, must have been for arrays. It is surely a good
9985 idea to have a scalar version there if there's something to finalize. */
9986 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9987 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9988 " defined at %L, suggest also scalar one",
9989 derived->name, &derived->declared_at);
9991 /* TODO: Remove this error when finalization is finished. */
9992 gfc_error ("Finalization at %L is not yet implemented",
9993 &derived->declared_at);
9999 /* Check that it is ok for the typebound procedure proc to override the
10003 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
10006 const gfc_symbol* proc_target;
10007 const gfc_symbol* old_target;
10008 unsigned proc_pass_arg, old_pass_arg, argpos;
10009 gfc_formal_arglist* proc_formal;
10010 gfc_formal_arglist* old_formal;
10012 /* This procedure should only be called for non-GENERIC proc. */
10013 gcc_assert (!proc->n.tb->is_generic);
10015 /* If the overwritten procedure is GENERIC, this is an error. */
10016 if (old->n.tb->is_generic)
10018 gfc_error ("Can't overwrite GENERIC '%s' at %L",
10019 old->name, &proc->n.tb->where);
10023 where = proc->n.tb->where;
10024 proc_target = proc->n.tb->u.specific->n.sym;
10025 old_target = old->n.tb->u.specific->n.sym;
10027 /* Check that overridden binding is not NON_OVERRIDABLE. */
10028 if (old->n.tb->non_overridable)
10030 gfc_error ("'%s' at %L overrides a procedure binding declared"
10031 " NON_OVERRIDABLE", proc->name, &where);
10035 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
10036 if (!old->n.tb->deferred && proc->n.tb->deferred)
10038 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
10039 " non-DEFERRED binding", proc->name, &where);
10043 /* If the overridden binding is PURE, the overriding must be, too. */
10044 if (old_target->attr.pure && !proc_target->attr.pure)
10046 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
10047 proc->name, &where);
10051 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
10052 is not, the overriding must not be either. */
10053 if (old_target->attr.elemental && !proc_target->attr.elemental)
10055 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
10056 " ELEMENTAL", proc->name, &where);
10059 if (!old_target->attr.elemental && proc_target->attr.elemental)
10061 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
10062 " be ELEMENTAL, either", proc->name, &where);
10066 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
10068 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
10070 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
10071 " SUBROUTINE", proc->name, &where);
10075 /* If the overridden binding is a FUNCTION, the overriding must also be a
10076 FUNCTION and have the same characteristics. */
10077 if (old_target->attr.function)
10079 if (!proc_target->attr.function)
10081 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
10082 " FUNCTION", proc->name, &where);
10086 /* FIXME: Do more comprehensive checking (including, for instance, the
10087 rank and array-shape). */
10088 gcc_assert (proc_target->result && old_target->result);
10089 if (!gfc_compare_types (&proc_target->result->ts,
10090 &old_target->result->ts))
10092 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
10093 " matching result types", proc->name, &where);
10098 /* If the overridden binding is PUBLIC, the overriding one must not be
10100 if (old->n.tb->access == ACCESS_PUBLIC
10101 && proc->n.tb->access == ACCESS_PRIVATE)
10103 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
10104 " PRIVATE", proc->name, &where);
10108 /* Compare the formal argument lists of both procedures. This is also abused
10109 to find the position of the passed-object dummy arguments of both
10110 bindings as at least the overridden one might not yet be resolved and we
10111 need those positions in the check below. */
10112 proc_pass_arg = old_pass_arg = 0;
10113 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
10115 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
10118 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
10119 proc_formal && old_formal;
10120 proc_formal = proc_formal->next, old_formal = old_formal->next)
10122 if (proc->n.tb->pass_arg
10123 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
10124 proc_pass_arg = argpos;
10125 if (old->n.tb->pass_arg
10126 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
10127 old_pass_arg = argpos;
10129 /* Check that the names correspond. */
10130 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
10132 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
10133 " to match the corresponding argument of the overridden"
10134 " procedure", proc_formal->sym->name, proc->name, &where,
10135 old_formal->sym->name);
10139 /* Check that the types correspond if neither is the passed-object
10141 /* FIXME: Do more comprehensive testing here. */
10142 if (proc_pass_arg != argpos && old_pass_arg != argpos
10143 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10145 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10146 "in respect to the overridden procedure",
10147 proc_formal->sym->name, proc->name, &where);
10153 if (proc_formal || old_formal)
10155 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10156 " the overridden procedure", proc->name, &where);
10160 /* If the overridden binding is NOPASS, the overriding one must also be
10162 if (old->n.tb->nopass && !proc->n.tb->nopass)
10164 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10165 " NOPASS", proc->name, &where);
10169 /* If the overridden binding is PASS(x), the overriding one must also be
10170 PASS and the passed-object dummy arguments must correspond. */
10171 if (!old->n.tb->nopass)
10173 if (proc->n.tb->nopass)
10175 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10176 " PASS", proc->name, &where);
10180 if (proc_pass_arg != old_pass_arg)
10182 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10183 " the same position as the passed-object dummy argument of"
10184 " the overridden procedure", proc->name, &where);
10193 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10196 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10197 const char* generic_name, locus where)
10202 gcc_assert (t1->specific && t2->specific);
10203 gcc_assert (!t1->specific->is_generic);
10204 gcc_assert (!t2->specific->is_generic);
10206 sym1 = t1->specific->u.specific->n.sym;
10207 sym2 = t2->specific->u.specific->n.sym;
10212 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10213 if (sym1->attr.subroutine != sym2->attr.subroutine
10214 || sym1->attr.function != sym2->attr.function)
10216 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10217 " GENERIC '%s' at %L",
10218 sym1->name, sym2->name, generic_name, &where);
10222 /* Compare the interfaces. */
10223 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10225 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10226 sym1->name, sym2->name, generic_name, &where);
10234 /* Worker function for resolving a generic procedure binding; this is used to
10235 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10237 The difference between those cases is finding possible inherited bindings
10238 that are overridden, as one has to look for them in tb_sym_root,
10239 tb_uop_root or tb_op, respectively. Thus the caller must already find
10240 the super-type and set p->overridden correctly. */
10243 resolve_tb_generic_targets (gfc_symbol* super_type,
10244 gfc_typebound_proc* p, const char* name)
10246 gfc_tbp_generic* target;
10247 gfc_symtree* first_target;
10248 gfc_symtree* inherited;
10250 gcc_assert (p && p->is_generic);
10252 /* Try to find the specific bindings for the symtrees in our target-list. */
10253 gcc_assert (p->u.generic);
10254 for (target = p->u.generic; target; target = target->next)
10255 if (!target->specific)
10257 gfc_typebound_proc* overridden_tbp;
10258 gfc_tbp_generic* g;
10259 const char* target_name;
10261 target_name = target->specific_st->name;
10263 /* Defined for this type directly. */
10264 if (target->specific_st->n.tb)
10266 target->specific = target->specific_st->n.tb;
10267 goto specific_found;
10270 /* Look for an inherited specific binding. */
10273 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10278 gcc_assert (inherited->n.tb);
10279 target->specific = inherited->n.tb;
10280 goto specific_found;
10284 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10285 " at %L", target_name, name, &p->where);
10288 /* Once we've found the specific binding, check it is not ambiguous with
10289 other specifics already found or inherited for the same GENERIC. */
10291 gcc_assert (target->specific);
10293 /* This must really be a specific binding! */
10294 if (target->specific->is_generic)
10296 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10297 " '%s' is GENERIC, too", name, &p->where, target_name);
10301 /* Check those already resolved on this type directly. */
10302 for (g = p->u.generic; g; g = g->next)
10303 if (g != target && g->specific
10304 && check_generic_tbp_ambiguity (target, g, name, p->where)
10308 /* Check for ambiguity with inherited specific targets. */
10309 for (overridden_tbp = p->overridden; overridden_tbp;
10310 overridden_tbp = overridden_tbp->overridden)
10311 if (overridden_tbp->is_generic)
10313 for (g = overridden_tbp->u.generic; g; g = g->next)
10315 gcc_assert (g->specific);
10316 if (check_generic_tbp_ambiguity (target, g,
10317 name, p->where) == FAILURE)
10323 /* If we attempt to "overwrite" a specific binding, this is an error. */
10324 if (p->overridden && !p->overridden->is_generic)
10326 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10327 " the same name", name, &p->where);
10331 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10332 all must have the same attributes here. */
10333 first_target = p->u.generic->specific->u.specific;
10334 gcc_assert (first_target);
10335 p->subroutine = first_target->n.sym->attr.subroutine;
10336 p->function = first_target->n.sym->attr.function;
10342 /* Resolve a GENERIC procedure binding for a derived type. */
10345 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10347 gfc_symbol* super_type;
10349 /* Find the overridden binding if any. */
10350 st->n.tb->overridden = NULL;
10351 super_type = gfc_get_derived_super_type (derived);
10354 gfc_symtree* overridden;
10355 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10358 if (overridden && overridden->n.tb)
10359 st->n.tb->overridden = overridden->n.tb;
10362 /* Resolve using worker function. */
10363 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10367 /* Retrieve the target-procedure of an operator binding and do some checks in
10368 common for intrinsic and user-defined type-bound operators. */
10371 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10373 gfc_symbol* target_proc;
10375 gcc_assert (target->specific && !target->specific->is_generic);
10376 target_proc = target->specific->u.specific->n.sym;
10377 gcc_assert (target_proc);
10379 /* All operator bindings must have a passed-object dummy argument. */
10380 if (target->specific->nopass)
10382 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10386 return target_proc;
10390 /* Resolve a type-bound intrinsic operator. */
10393 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10394 gfc_typebound_proc* p)
10396 gfc_symbol* super_type;
10397 gfc_tbp_generic* target;
10399 /* If there's already an error here, do nothing (but don't fail again). */
10403 /* Operators should always be GENERIC bindings. */
10404 gcc_assert (p->is_generic);
10406 /* Look for an overridden binding. */
10407 super_type = gfc_get_derived_super_type (derived);
10408 if (super_type && super_type->f2k_derived)
10409 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10412 p->overridden = NULL;
10414 /* Resolve general GENERIC properties using worker function. */
10415 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10418 /* Check the targets to be procedures of correct interface. */
10419 for (target = p->u.generic; target; target = target->next)
10421 gfc_symbol* target_proc;
10423 target_proc = get_checked_tb_operator_target (target, p->where);
10427 if (!gfc_check_operator_interface (target_proc, op, p->where))
10439 /* Resolve a type-bound user operator (tree-walker callback). */
10441 static gfc_symbol* resolve_bindings_derived;
10442 static gfc_try resolve_bindings_result;
10444 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10447 resolve_typebound_user_op (gfc_symtree* stree)
10449 gfc_symbol* super_type;
10450 gfc_tbp_generic* target;
10452 gcc_assert (stree && stree->n.tb);
10454 if (stree->n.tb->error)
10457 /* Operators should always be GENERIC bindings. */
10458 gcc_assert (stree->n.tb->is_generic);
10460 /* Find overridden procedure, if any. */
10461 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10462 if (super_type && super_type->f2k_derived)
10464 gfc_symtree* overridden;
10465 overridden = gfc_find_typebound_user_op (super_type, NULL,
10466 stree->name, true, NULL);
10468 if (overridden && overridden->n.tb)
10469 stree->n.tb->overridden = overridden->n.tb;
10472 stree->n.tb->overridden = NULL;
10474 /* Resolve basically using worker function. */
10475 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10479 /* Check the targets to be functions of correct interface. */
10480 for (target = stree->n.tb->u.generic; target; target = target->next)
10482 gfc_symbol* target_proc;
10484 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10488 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10495 resolve_bindings_result = FAILURE;
10496 stree->n.tb->error = 1;
10500 /* Resolve the type-bound procedures for a derived type. */
10503 resolve_typebound_procedure (gfc_symtree* stree)
10507 gfc_symbol* me_arg;
10508 gfc_symbol* super_type;
10509 gfc_component* comp;
10511 gcc_assert (stree);
10513 /* Undefined specific symbol from GENERIC target definition. */
10517 if (stree->n.tb->error)
10520 /* If this is a GENERIC binding, use that routine. */
10521 if (stree->n.tb->is_generic)
10523 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10529 /* Get the target-procedure to check it. */
10530 gcc_assert (!stree->n.tb->is_generic);
10531 gcc_assert (stree->n.tb->u.specific);
10532 proc = stree->n.tb->u.specific->n.sym;
10533 where = stree->n.tb->where;
10535 /* Default access should already be resolved from the parser. */
10536 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10538 /* It should be a module procedure or an external procedure with explicit
10539 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10540 if ((!proc->attr.subroutine && !proc->attr.function)
10541 || (proc->attr.proc != PROC_MODULE
10542 && proc->attr.if_source != IFSRC_IFBODY)
10543 || (proc->attr.abstract && !stree->n.tb->deferred))
10545 gfc_error ("'%s' must be a module procedure or an external procedure with"
10546 " an explicit interface at %L", proc->name, &where);
10549 stree->n.tb->subroutine = proc->attr.subroutine;
10550 stree->n.tb->function = proc->attr.function;
10552 /* Find the super-type of the current derived type. We could do this once and
10553 store in a global if speed is needed, but as long as not I believe this is
10554 more readable and clearer. */
10555 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10557 /* If PASS, resolve and check arguments if not already resolved / loaded
10558 from a .mod file. */
10559 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10561 if (stree->n.tb->pass_arg)
10563 gfc_formal_arglist* i;
10565 /* If an explicit passing argument name is given, walk the arg-list
10566 and look for it. */
10569 stree->n.tb->pass_arg_num = 1;
10570 for (i = proc->formal; i; i = i->next)
10572 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10577 ++stree->n.tb->pass_arg_num;
10582 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10584 proc->name, stree->n.tb->pass_arg, &where,
10585 stree->n.tb->pass_arg);
10591 /* Otherwise, take the first one; there should in fact be at least
10593 stree->n.tb->pass_arg_num = 1;
10596 gfc_error ("Procedure '%s' with PASS at %L must have at"
10597 " least one argument", proc->name, &where);
10600 me_arg = proc->formal->sym;
10603 /* Now check that the argument-type matches and the passed-object
10604 dummy argument is generally fine. */
10606 gcc_assert (me_arg);
10608 if (me_arg->ts.type != BT_CLASS)
10610 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10611 " at %L", proc->name, &where);
10615 if (CLASS_DATA (me_arg)->ts.u.derived
10616 != resolve_bindings_derived)
10618 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10619 " the derived-type '%s'", me_arg->name, proc->name,
10620 me_arg->name, &where, resolve_bindings_derived->name);
10624 gcc_assert (me_arg->ts.type == BT_CLASS);
10625 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
10627 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10628 " scalar", proc->name, &where);
10631 if (CLASS_DATA (me_arg)->attr.allocatable)
10633 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10634 " be ALLOCATABLE", proc->name, &where);
10637 if (CLASS_DATA (me_arg)->attr.class_pointer)
10639 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10640 " be POINTER", proc->name, &where);
10645 /* If we are extending some type, check that we don't override a procedure
10646 flagged NON_OVERRIDABLE. */
10647 stree->n.tb->overridden = NULL;
10650 gfc_symtree* overridden;
10651 overridden = gfc_find_typebound_proc (super_type, NULL,
10652 stree->name, true, NULL);
10654 if (overridden && overridden->n.tb)
10655 stree->n.tb->overridden = overridden->n.tb;
10657 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10661 /* See if there's a name collision with a component directly in this type. */
10662 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10663 if (!strcmp (comp->name, stree->name))
10665 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10667 stree->name, &where, resolve_bindings_derived->name);
10671 /* Try to find a name collision with an inherited component. */
10672 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10674 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10675 " component of '%s'",
10676 stree->name, &where, resolve_bindings_derived->name);
10680 stree->n.tb->error = 0;
10684 resolve_bindings_result = FAILURE;
10685 stree->n.tb->error = 1;
10689 resolve_typebound_procedures (gfc_symbol* derived)
10693 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10696 resolve_bindings_derived = derived;
10697 resolve_bindings_result = SUCCESS;
10699 if (derived->f2k_derived->tb_sym_root)
10700 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10701 &resolve_typebound_procedure);
10703 if (derived->f2k_derived->tb_uop_root)
10704 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10705 &resolve_typebound_user_op);
10707 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10709 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10710 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10712 resolve_bindings_result = FAILURE;
10715 return resolve_bindings_result;
10719 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10720 to give all identical derived types the same backend_decl. */
10722 add_dt_to_dt_list (gfc_symbol *derived)
10724 gfc_dt_list *dt_list;
10726 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10727 if (derived == dt_list->derived)
10730 if (dt_list == NULL)
10732 dt_list = gfc_get_dt_list ();
10733 dt_list->next = gfc_derived_types;
10734 dt_list->derived = derived;
10735 gfc_derived_types = dt_list;
10740 /* Ensure that a derived-type is really not abstract, meaning that every
10741 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10744 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10749 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10751 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10754 if (st->n.tb && st->n.tb->deferred)
10756 gfc_symtree* overriding;
10757 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10760 gcc_assert (overriding->n.tb);
10761 if (overriding->n.tb->deferred)
10763 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10764 " '%s' is DEFERRED and not overridden",
10765 sub->name, &sub->declared_at, st->name);
10774 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10776 /* The algorithm used here is to recursively travel up the ancestry of sub
10777 and for each ancestor-type, check all bindings. If any of them is
10778 DEFERRED, look it up starting from sub and see if the found (overriding)
10779 binding is not DEFERRED.
10780 This is not the most efficient way to do this, but it should be ok and is
10781 clearer than something sophisticated. */
10783 gcc_assert (ancestor && !sub->attr.abstract);
10785 if (!ancestor->attr.abstract)
10788 /* Walk bindings of this ancestor. */
10789 if (ancestor->f2k_derived)
10792 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10797 /* Find next ancestor type and recurse on it. */
10798 ancestor = gfc_get_derived_super_type (ancestor);
10800 return ensure_not_abstract (sub, ancestor);
10806 static void resolve_symbol (gfc_symbol *sym);
10809 /* Resolve the components of a derived type. */
10812 resolve_fl_derived (gfc_symbol *sym)
10814 gfc_symbol* super_type;
10817 super_type = gfc_get_derived_super_type (sym);
10819 if (sym->attr.is_class && sym->ts.u.derived == NULL)
10821 /* Fix up incomplete CLASS symbols. */
10822 gfc_component *data = gfc_find_component (sym, "$data", true, true);
10823 gfc_component *vptr = gfc_find_component (sym, "$vptr", true, true);
10824 if (vptr->ts.u.derived == NULL)
10826 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
10828 vptr->ts.u.derived = vtab->ts.u.derived;
10833 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10835 gfc_error ("As extending type '%s' at %L has a coarray component, "
10836 "parent type '%s' shall also have one", sym->name,
10837 &sym->declared_at, super_type->name);
10841 /* Ensure the extended type gets resolved before we do. */
10842 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10845 /* An ABSTRACT type must be extensible. */
10846 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10848 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10849 sym->name, &sym->declared_at);
10853 for (c = sym->components; c != NULL; c = c->next)
10856 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10857 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10859 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10860 "deferred shape", c->name, &c->loc);
10865 if (c->attr.codimension && c->ts.type == BT_DERIVED
10866 && c->ts.u.derived->ts.is_iso_c)
10868 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10869 "shall not be a coarray", c->name, &c->loc);
10874 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10875 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10876 || c->attr.allocatable))
10878 gfc_error ("Component '%s' at %L with coarray component "
10879 "shall be a nonpointer, nonallocatable scalar",
10885 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
10887 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
10888 "is not an array pointer", c->name, &c->loc);
10892 if (c->attr.proc_pointer && c->ts.interface)
10894 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
10895 gfc_error ("Interface '%s', used by procedure pointer component "
10896 "'%s' at %L, is declared in a later PROCEDURE statement",
10897 c->ts.interface->name, c->name, &c->loc);
10899 /* Get the attributes from the interface (now resolved). */
10900 if (c->ts.interface->attr.if_source
10901 || c->ts.interface->attr.intrinsic)
10903 gfc_symbol *ifc = c->ts.interface;
10905 if (ifc->formal && !ifc->formal_ns)
10906 resolve_symbol (ifc);
10908 if (ifc->attr.intrinsic)
10909 resolve_intrinsic (ifc, &ifc->declared_at);
10913 c->ts = ifc->result->ts;
10914 c->attr.allocatable = ifc->result->attr.allocatable;
10915 c->attr.pointer = ifc->result->attr.pointer;
10916 c->attr.dimension = ifc->result->attr.dimension;
10917 c->as = gfc_copy_array_spec (ifc->result->as);
10922 c->attr.allocatable = ifc->attr.allocatable;
10923 c->attr.pointer = ifc->attr.pointer;
10924 c->attr.dimension = ifc->attr.dimension;
10925 c->as = gfc_copy_array_spec (ifc->as);
10927 c->ts.interface = ifc;
10928 c->attr.function = ifc->attr.function;
10929 c->attr.subroutine = ifc->attr.subroutine;
10930 gfc_copy_formal_args_ppc (c, ifc);
10932 c->attr.pure = ifc->attr.pure;
10933 c->attr.elemental = ifc->attr.elemental;
10934 c->attr.recursive = ifc->attr.recursive;
10935 c->attr.always_explicit = ifc->attr.always_explicit;
10936 c->attr.ext_attr |= ifc->attr.ext_attr;
10937 /* Replace symbols in array spec. */
10941 for (i = 0; i < c->as->rank; i++)
10943 gfc_expr_replace_comp (c->as->lower[i], c);
10944 gfc_expr_replace_comp (c->as->upper[i], c);
10947 /* Copy char length. */
10948 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10950 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10951 gfc_expr_replace_comp (cl->length, c);
10952 if (cl->length && !cl->resolved
10953 && gfc_resolve_expr (cl->length) == FAILURE)
10958 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
10960 gfc_error ("Interface '%s' of procedure pointer component "
10961 "'%s' at %L must be explicit", c->ts.interface->name,
10966 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10968 /* Since PPCs are not implicitly typed, a PPC without an explicit
10969 interface must be a subroutine. */
10970 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10973 /* Procedure pointer components: Check PASS arg. */
10974 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
10975 && !sym->attr.vtype)
10977 gfc_symbol* me_arg;
10979 if (c->tb->pass_arg)
10981 gfc_formal_arglist* i;
10983 /* If an explicit passing argument name is given, walk the arg-list
10984 and look for it. */
10987 c->tb->pass_arg_num = 1;
10988 for (i = c->formal; i; i = i->next)
10990 if (!strcmp (i->sym->name, c->tb->pass_arg))
10995 c->tb->pass_arg_num++;
11000 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11001 "at %L has no argument '%s'", c->name,
11002 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11009 /* Otherwise, take the first one; there should in fact be at least
11011 c->tb->pass_arg_num = 1;
11014 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11015 "must have at least one argument",
11020 me_arg = c->formal->sym;
11023 /* Now check that the argument-type matches. */
11024 gcc_assert (me_arg);
11025 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11026 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11027 || (me_arg->ts.type == BT_CLASS
11028 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11030 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11031 " the derived type '%s'", me_arg->name, c->name,
11032 me_arg->name, &c->loc, sym->name);
11037 /* Check for C453. */
11038 if (me_arg->attr.dimension)
11040 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11041 "must be scalar", me_arg->name, c->name, me_arg->name,
11047 if (me_arg->attr.pointer)
11049 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11050 "may not have the POINTER attribute", me_arg->name,
11051 c->name, me_arg->name, &c->loc);
11056 if (me_arg->attr.allocatable)
11058 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11059 "may not be ALLOCATABLE", me_arg->name, c->name,
11060 me_arg->name, &c->loc);
11065 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11066 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11067 " at %L", c->name, &c->loc);
11071 /* Check type-spec if this is not the parent-type component. */
11072 if ((!sym->attr.extension || c != sym->components)
11073 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11076 /* If this type is an extension, set the accessibility of the parent
11078 if (super_type && c == sym->components
11079 && strcmp (super_type->name, c->name) == 0)
11080 c->attr.access = super_type->attr.access;
11082 /* If this type is an extension, see if this component has the same name
11083 as an inherited type-bound procedure. */
11084 if (super_type && !sym->attr.is_class
11085 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11087 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11088 " inherited type-bound procedure",
11089 c->name, sym->name, &c->loc);
11093 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
11095 if (c->ts.u.cl->length == NULL
11096 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11097 || !gfc_is_constant_expr (c->ts.u.cl->length))
11099 gfc_error ("Character length of component '%s' needs to "
11100 "be a constant specification expression at %L",
11102 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11107 if (c->ts.type == BT_DERIVED
11108 && sym->component_access != ACCESS_PRIVATE
11109 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11110 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11111 && !c->ts.u.derived->attr.use_assoc
11112 && !gfc_check_access (c->ts.u.derived->attr.access,
11113 c->ts.u.derived->ns->default_access)
11114 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11115 "is a PRIVATE type and cannot be a component of "
11116 "'%s', which is PUBLIC at %L", c->name,
11117 sym->name, &sym->declared_at) == FAILURE)
11120 if (sym->attr.sequence)
11122 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11124 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11125 "not have the SEQUENCE attribute",
11126 c->ts.u.derived->name, &sym->declared_at);
11131 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && c->attr.pointer
11132 && c->ts.u.derived->components == NULL
11133 && !c->ts.u.derived->attr.zero_comp)
11135 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11136 "that has not been declared", c->name, sym->name,
11141 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.class_pointer
11142 && CLASS_DATA (c)->ts.u.derived->components == NULL
11143 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11145 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11146 "that has not been declared", c->name, sym->name,
11152 if (c->ts.type == BT_CLASS
11153 && !(CLASS_DATA (c)->attr.class_pointer
11154 || CLASS_DATA (c)->attr.allocatable))
11156 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11157 "or pointer", c->name, &c->loc);
11161 /* Ensure that all the derived type components are put on the
11162 derived type list; even in formal namespaces, where derived type
11163 pointer components might not have been declared. */
11164 if (c->ts.type == BT_DERIVED
11166 && c->ts.u.derived->components
11168 && sym != c->ts.u.derived)
11169 add_dt_to_dt_list (c->ts.u.derived);
11171 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11172 || c->attr.proc_pointer
11173 || c->attr.allocatable)) == FAILURE)
11177 /* Resolve the type-bound procedures. */
11178 if (resolve_typebound_procedures (sym) == FAILURE)
11181 /* Resolve the finalizer procedures. */
11182 if (gfc_resolve_finalizers (sym) == FAILURE)
11185 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11186 all DEFERRED bindings are overridden. */
11187 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11188 && !sym->attr.is_class
11189 && ensure_not_abstract (sym, super_type) == FAILURE)
11192 /* Add derived type to the derived type list. */
11193 add_dt_to_dt_list (sym);
11200 resolve_fl_namelist (gfc_symbol *sym)
11205 /* Reject PRIVATE objects in a PUBLIC namelist. */
11206 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
11208 for (nl = sym->namelist; nl; nl = nl->next)
11210 if (!nl->sym->attr.use_assoc
11211 && !is_sym_host_assoc (nl->sym, sym->ns)
11212 && !gfc_check_access(nl->sym->attr.access,
11213 nl->sym->ns->default_access))
11215 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11216 "cannot be member of PUBLIC namelist '%s' at %L",
11217 nl->sym->name, sym->name, &sym->declared_at);
11221 /* Types with private components that came here by USE-association. */
11222 if (nl->sym->ts.type == BT_DERIVED
11223 && derived_inaccessible (nl->sym->ts.u.derived))
11225 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11226 "components and cannot be member of namelist '%s' at %L",
11227 nl->sym->name, sym->name, &sym->declared_at);
11231 /* Types with private components that are defined in the same module. */
11232 if (nl->sym->ts.type == BT_DERIVED
11233 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11234 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
11235 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
11236 nl->sym->ns->default_access))
11238 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11239 "cannot be a member of PUBLIC namelist '%s' at %L",
11240 nl->sym->name, sym->name, &sym->declared_at);
11246 for (nl = sym->namelist; nl; nl = nl->next)
11248 /* Reject namelist arrays of assumed shape. */
11249 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11250 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
11251 "must not have assumed shape in namelist "
11252 "'%s' at %L", nl->sym->name, sym->name,
11253 &sym->declared_at) == FAILURE)
11256 /* Reject namelist arrays that are not constant shape. */
11257 if (is_non_constant_shape_array (nl->sym))
11259 gfc_error ("NAMELIST array object '%s' must have constant "
11260 "shape in namelist '%s' at %L", nl->sym->name,
11261 sym->name, &sym->declared_at);
11265 /* Namelist objects cannot have allocatable or pointer components. */
11266 if (nl->sym->ts.type != BT_DERIVED)
11269 if (nl->sym->ts.u.derived->attr.alloc_comp)
11271 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11272 "have ALLOCATABLE components",
11273 nl->sym->name, sym->name, &sym->declared_at);
11277 if (nl->sym->ts.u.derived->attr.pointer_comp)
11279 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11280 "have POINTER components",
11281 nl->sym->name, sym->name, &sym->declared_at);
11287 /* 14.1.2 A module or internal procedure represent local entities
11288 of the same type as a namelist member and so are not allowed. */
11289 for (nl = sym->namelist; nl; nl = nl->next)
11291 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11294 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11295 if ((nl->sym == sym->ns->proc_name)
11297 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11301 if (nl->sym && nl->sym->name)
11302 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11303 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11305 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11306 "attribute in '%s' at %L", nlsym->name,
11307 &sym->declared_at);
11317 resolve_fl_parameter (gfc_symbol *sym)
11319 /* A parameter array's shape needs to be constant. */
11320 if (sym->as != NULL
11321 && (sym->as->type == AS_DEFERRED
11322 || is_non_constant_shape_array (sym)))
11324 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11325 "or of deferred shape", sym->name, &sym->declared_at);
11329 /* Make sure a parameter that has been implicitly typed still
11330 matches the implicit type, since PARAMETER statements can precede
11331 IMPLICIT statements. */
11332 if (sym->attr.implicit_type
11333 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11336 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11337 "later IMPLICIT type", sym->name, &sym->declared_at);
11341 /* Make sure the types of derived parameters are consistent. This
11342 type checking is deferred until resolution because the type may
11343 refer to a derived type from the host. */
11344 if (sym->ts.type == BT_DERIVED
11345 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11347 gfc_error ("Incompatible derived type in PARAMETER at %L",
11348 &sym->value->where);
11355 /* Do anything necessary to resolve a symbol. Right now, we just
11356 assume that an otherwise unknown symbol is a variable. This sort
11357 of thing commonly happens for symbols in module. */
11360 resolve_symbol (gfc_symbol *sym)
11362 int check_constant, mp_flag;
11363 gfc_symtree *symtree;
11364 gfc_symtree *this_symtree;
11368 /* Avoid double resolution of function result symbols. */
11369 if ((sym->result || sym->attr.result) && (sym->ns != gfc_current_ns))
11372 if (sym->attr.flavor == FL_UNKNOWN)
11375 /* If we find that a flavorless symbol is an interface in one of the
11376 parent namespaces, find its symtree in this namespace, free the
11377 symbol and set the symtree to point to the interface symbol. */
11378 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11380 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11381 if (symtree && symtree->n.sym->generic)
11383 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11387 gfc_free_symbol (sym);
11388 symtree->n.sym->refs++;
11389 this_symtree->n.sym = symtree->n.sym;
11394 /* Otherwise give it a flavor according to such attributes as
11396 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11397 sym->attr.flavor = FL_VARIABLE;
11400 sym->attr.flavor = FL_PROCEDURE;
11401 if (sym->attr.dimension)
11402 sym->attr.function = 1;
11406 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11407 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11409 if (sym->attr.procedure && sym->ts.interface
11410 && sym->attr.if_source != IFSRC_DECL)
11412 if (sym->ts.interface == sym)
11414 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11415 "interface", sym->name, &sym->declared_at);
11418 if (sym->ts.interface->attr.procedure)
11420 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11421 " in a later PROCEDURE statement", sym->ts.interface->name,
11422 sym->name,&sym->declared_at);
11426 /* Get the attributes from the interface (now resolved). */
11427 if (sym->ts.interface->attr.if_source
11428 || sym->ts.interface->attr.intrinsic)
11430 gfc_symbol *ifc = sym->ts.interface;
11431 resolve_symbol (ifc);
11433 if (ifc->attr.intrinsic)
11434 resolve_intrinsic (ifc, &ifc->declared_at);
11437 sym->ts = ifc->result->ts;
11440 sym->ts.interface = ifc;
11441 sym->attr.function = ifc->attr.function;
11442 sym->attr.subroutine = ifc->attr.subroutine;
11443 gfc_copy_formal_args (sym, ifc);
11445 sym->attr.allocatable = ifc->attr.allocatable;
11446 sym->attr.pointer = ifc->attr.pointer;
11447 sym->attr.pure = ifc->attr.pure;
11448 sym->attr.elemental = ifc->attr.elemental;
11449 sym->attr.dimension = ifc->attr.dimension;
11450 sym->attr.contiguous = ifc->attr.contiguous;
11451 sym->attr.recursive = ifc->attr.recursive;
11452 sym->attr.always_explicit = ifc->attr.always_explicit;
11453 sym->attr.ext_attr |= ifc->attr.ext_attr;
11454 /* Copy array spec. */
11455 sym->as = gfc_copy_array_spec (ifc->as);
11459 for (i = 0; i < sym->as->rank; i++)
11461 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11462 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11465 /* Copy char length. */
11466 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11468 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11469 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11470 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
11471 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
11475 else if (sym->ts.interface->name[0] != '\0')
11477 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11478 sym->ts.interface->name, sym->name, &sym->declared_at);
11483 if (sym->attr.is_protected && !sym->attr.proc_pointer
11484 && (sym->attr.procedure || sym->attr.external))
11486 if (sym->attr.external)
11487 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11488 "at %L", &sym->declared_at);
11490 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11491 "at %L", &sym->declared_at);
11498 if (sym->attr.contiguous
11499 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
11500 && !sym->attr.pointer)))
11502 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
11503 "array pointer or an assumed-shape array", sym->name,
11504 &sym->declared_at);
11508 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11511 /* Symbols that are module procedures with results (functions) have
11512 the types and array specification copied for type checking in
11513 procedures that call them, as well as for saving to a module
11514 file. These symbols can't stand the scrutiny that their results
11516 mp_flag = (sym->result != NULL && sym->result != sym);
11518 /* Make sure that the intrinsic is consistent with its internal
11519 representation. This needs to be done before assigning a default
11520 type to avoid spurious warnings. */
11521 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11522 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11525 /* For associate names, resolve corresponding expression and make sure
11526 they get their type-spec set this way. */
11529 gcc_assert (sym->attr.flavor == FL_VARIABLE);
11530 if (gfc_resolve_expr (sym->assoc->target) != SUCCESS)
11533 sym->ts = sym->assoc->target->ts;
11534 gcc_assert (sym->ts.type != BT_UNKNOWN);
11537 /* Assign default type to symbols that need one and don't have one. */
11538 if (sym->ts.type == BT_UNKNOWN)
11540 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11541 gfc_set_default_type (sym, 1, NULL);
11543 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11544 && !sym->attr.function && !sym->attr.subroutine
11545 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11546 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11548 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11550 /* The specific case of an external procedure should emit an error
11551 in the case that there is no implicit type. */
11553 gfc_set_default_type (sym, sym->attr.external, NULL);
11556 /* Result may be in another namespace. */
11557 resolve_symbol (sym->result);
11559 if (!sym->result->attr.proc_pointer)
11561 sym->ts = sym->result->ts;
11562 sym->as = gfc_copy_array_spec (sym->result->as);
11563 sym->attr.dimension = sym->result->attr.dimension;
11564 sym->attr.pointer = sym->result->attr.pointer;
11565 sym->attr.allocatable = sym->result->attr.allocatable;
11566 sym->attr.contiguous = sym->result->attr.contiguous;
11572 /* Assumed size arrays and assumed shape arrays must be dummy
11575 if (sym->as != NULL
11576 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11577 || sym->as->type == AS_ASSUMED_SHAPE)
11578 && sym->attr.dummy == 0)
11580 if (sym->as->type == AS_ASSUMED_SIZE)
11581 gfc_error ("Assumed size array at %L must be a dummy argument",
11582 &sym->declared_at);
11584 gfc_error ("Assumed shape array at %L must be a dummy argument",
11585 &sym->declared_at);
11589 /* Make sure symbols with known intent or optional are really dummy
11590 variable. Because of ENTRY statement, this has to be deferred
11591 until resolution time. */
11593 if (!sym->attr.dummy
11594 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11596 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11600 if (sym->attr.value && !sym->attr.dummy)
11602 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11603 "it is not a dummy argument", sym->name, &sym->declared_at);
11607 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11609 gfc_charlen *cl = sym->ts.u.cl;
11610 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11612 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11613 "attribute must have constant length",
11614 sym->name, &sym->declared_at);
11618 if (sym->ts.is_c_interop
11619 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11621 gfc_error ("C interoperable character dummy variable '%s' at %L "
11622 "with VALUE attribute must have length one",
11623 sym->name, &sym->declared_at);
11628 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11629 do this for something that was implicitly typed because that is handled
11630 in gfc_set_default_type. Handle dummy arguments and procedure
11631 definitions separately. Also, anything that is use associated is not
11632 handled here but instead is handled in the module it is declared in.
11633 Finally, derived type definitions are allowed to be BIND(C) since that
11634 only implies that they're interoperable, and they are checked fully for
11635 interoperability when a variable is declared of that type. */
11636 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11637 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11638 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11640 gfc_try t = SUCCESS;
11642 /* First, make sure the variable is declared at the
11643 module-level scope (J3/04-007, Section 15.3). */
11644 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11645 sym->attr.in_common == 0)
11647 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11648 "is neither a COMMON block nor declared at the "
11649 "module level scope", sym->name, &(sym->declared_at));
11652 else if (sym->common_head != NULL)
11654 t = verify_com_block_vars_c_interop (sym->common_head);
11658 /* If type() declaration, we need to verify that the components
11659 of the given type are all C interoperable, etc. */
11660 if (sym->ts.type == BT_DERIVED &&
11661 sym->ts.u.derived->attr.is_c_interop != 1)
11663 /* Make sure the user marked the derived type as BIND(C). If
11664 not, call the verify routine. This could print an error
11665 for the derived type more than once if multiple variables
11666 of that type are declared. */
11667 if (sym->ts.u.derived->attr.is_bind_c != 1)
11668 verify_bind_c_derived_type (sym->ts.u.derived);
11672 /* Verify the variable itself as C interoperable if it
11673 is BIND(C). It is not possible for this to succeed if
11674 the verify_bind_c_derived_type failed, so don't have to handle
11675 any error returned by verify_bind_c_derived_type. */
11676 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11677 sym->common_block);
11682 /* clear the is_bind_c flag to prevent reporting errors more than
11683 once if something failed. */
11684 sym->attr.is_bind_c = 0;
11689 /* If a derived type symbol has reached this point, without its
11690 type being declared, we have an error. Notice that most
11691 conditions that produce undefined derived types have already
11692 been dealt with. However, the likes of:
11693 implicit type(t) (t) ..... call foo (t) will get us here if
11694 the type is not declared in the scope of the implicit
11695 statement. Change the type to BT_UNKNOWN, both because it is so
11696 and to prevent an ICE. */
11697 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11698 && !sym->ts.u.derived->attr.zero_comp)
11700 gfc_error ("The derived type '%s' at %L is of type '%s', "
11701 "which has not been defined", sym->name,
11702 &sym->declared_at, sym->ts.u.derived->name);
11703 sym->ts.type = BT_UNKNOWN;
11707 /* Make sure that the derived type has been resolved and that the
11708 derived type is visible in the symbol's namespace, if it is a
11709 module function and is not PRIVATE. */
11710 if (sym->ts.type == BT_DERIVED
11711 && sym->ts.u.derived->attr.use_assoc
11712 && sym->ns->proc_name
11713 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11717 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11720 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11721 if (!ds && sym->attr.function
11722 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11724 symtree = gfc_new_symtree (&sym->ns->sym_root,
11725 sym->ts.u.derived->name);
11726 symtree->n.sym = sym->ts.u.derived;
11727 sym->ts.u.derived->refs++;
11731 /* Unless the derived-type declaration is use associated, Fortran 95
11732 does not allow public entries of private derived types.
11733 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11734 161 in 95-006r3. */
11735 if (sym->ts.type == BT_DERIVED
11736 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11737 && !sym->ts.u.derived->attr.use_assoc
11738 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11739 && !gfc_check_access (sym->ts.u.derived->attr.access,
11740 sym->ts.u.derived->ns->default_access)
11741 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11742 "of PRIVATE derived type '%s'",
11743 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11744 : "variable", sym->name, &sym->declared_at,
11745 sym->ts.u.derived->name) == FAILURE)
11748 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11749 default initialization is defined (5.1.2.4.4). */
11750 if (sym->ts.type == BT_DERIVED
11752 && sym->attr.intent == INTENT_OUT
11754 && sym->as->type == AS_ASSUMED_SIZE)
11756 for (c = sym->ts.u.derived->components; c; c = c->next)
11758 if (c->initializer)
11760 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11761 "ASSUMED SIZE and so cannot have a default initializer",
11762 sym->name, &sym->declared_at);
11769 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11770 || sym->attr.codimension)
11771 && sym->attr.result)
11772 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11773 "a coarray component", sym->name, &sym->declared_at);
11776 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11777 && sym->ts.u.derived->ts.is_iso_c)
11778 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11779 "shall not be a coarray", sym->name, &sym->declared_at);
11782 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11783 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11784 || sym->attr.allocatable))
11785 gfc_error ("Variable '%s' at %L with coarray component "
11786 "shall be a nonpointer, nonallocatable scalar",
11787 sym->name, &sym->declared_at);
11789 /* F2008, C526. The function-result case was handled above. */
11790 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11791 || sym->attr.codimension)
11792 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11793 || sym->ns->proc_name->attr.flavor == FL_MODULE
11794 || sym->ns->proc_name->attr.is_main_program
11795 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11796 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11797 "component and is not ALLOCATABLE, SAVE nor a "
11798 "dummy argument", sym->name, &sym->declared_at);
11799 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11800 else if (sym->attr.codimension && !sym->attr.allocatable
11801 && sym->as && sym->as->cotype == AS_DEFERRED)
11802 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11803 "deferred shape", sym->name, &sym->declared_at);
11804 else if (sym->attr.codimension && sym->attr.allocatable
11805 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11806 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11807 "deferred shape", sym->name, &sym->declared_at);
11811 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11812 || (sym->attr.codimension && sym->attr.allocatable))
11813 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11814 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11815 "allocatable coarray or have coarray components",
11816 sym->name, &sym->declared_at);
11818 if (sym->attr.codimension && sym->attr.dummy
11819 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11820 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11821 "procedure '%s'", sym->name, &sym->declared_at,
11822 sym->ns->proc_name->name);
11824 switch (sym->attr.flavor)
11827 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11832 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11837 if (resolve_fl_namelist (sym) == FAILURE)
11842 if (resolve_fl_parameter (sym) == FAILURE)
11850 /* Resolve array specifier. Check as well some constraints
11851 on COMMON blocks. */
11853 check_constant = sym->attr.in_common && !sym->attr.pointer;
11855 /* Set the formal_arg_flag so that check_conflict will not throw
11856 an error for host associated variables in the specification
11857 expression for an array_valued function. */
11858 if (sym->attr.function && sym->as)
11859 formal_arg_flag = 1;
11861 gfc_resolve_array_spec (sym->as, check_constant);
11863 formal_arg_flag = 0;
11865 /* Resolve formal namespaces. */
11866 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11867 && !sym->attr.contained && !sym->attr.intrinsic)
11868 gfc_resolve (sym->formal_ns);
11870 /* Make sure the formal namespace is present. */
11871 if (sym->formal && !sym->formal_ns)
11873 gfc_formal_arglist *formal = sym->formal;
11874 while (formal && !formal->sym)
11875 formal = formal->next;
11879 sym->formal_ns = formal->sym->ns;
11880 sym->formal_ns->refs++;
11884 /* Check threadprivate restrictions. */
11885 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11886 && (!sym->attr.in_common
11887 && sym->module == NULL
11888 && (sym->ns->proc_name == NULL
11889 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11890 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11892 /* If we have come this far we can apply default-initializers, as
11893 described in 14.7.5, to those variables that have not already
11894 been assigned one. */
11895 if (sym->ts.type == BT_DERIVED
11896 && sym->attr.referenced
11897 && sym->ns == gfc_current_ns
11899 && !sym->attr.allocatable
11900 && !sym->attr.alloc_comp)
11902 symbol_attribute *a = &sym->attr;
11904 if ((!a->save && !a->dummy && !a->pointer
11905 && !a->in_common && !a->use_assoc
11906 && !(a->function && sym != sym->result))
11907 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11908 apply_default_init (sym);
11911 /* If this symbol has a type-spec, check it. */
11912 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11913 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11914 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11920 /************* Resolve DATA statements *************/
11924 gfc_data_value *vnode;
11930 /* Advance the values structure to point to the next value in the data list. */
11933 next_data_value (void)
11935 while (mpz_cmp_ui (values.left, 0) == 0)
11938 if (values.vnode->next == NULL)
11941 values.vnode = values.vnode->next;
11942 mpz_set (values.left, values.vnode->repeat);
11950 check_data_variable (gfc_data_variable *var, locus *where)
11956 ar_type mark = AR_UNKNOWN;
11958 mpz_t section_index[GFC_MAX_DIMENSIONS];
11964 if (gfc_resolve_expr (var->expr) == FAILURE)
11968 mpz_init_set_si (offset, 0);
11971 if (e->expr_type != EXPR_VARIABLE)
11972 gfc_internal_error ("check_data_variable(): Bad expression");
11974 sym = e->symtree->n.sym;
11976 if (sym->ns->is_block_data && !sym->attr.in_common)
11978 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11979 sym->name, &sym->declared_at);
11982 if (e->ref == NULL && sym->as)
11984 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11985 " declaration", sym->name, where);
11989 has_pointer = sym->attr.pointer;
11991 for (ref = e->ref; ref; ref = ref->next)
11993 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11996 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11998 gfc_error ("DATA element '%s' at %L cannot have a coindex",
12004 && ref->type == REF_ARRAY
12005 && ref->u.ar.type != AR_FULL)
12007 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12008 "be a full array", sym->name, where);
12013 if (e->rank == 0 || has_pointer)
12015 mpz_init_set_ui (size, 1);
12022 /* Find the array section reference. */
12023 for (ref = e->ref; ref; ref = ref->next)
12025 if (ref->type != REF_ARRAY)
12027 if (ref->u.ar.type == AR_ELEMENT)
12033 /* Set marks according to the reference pattern. */
12034 switch (ref->u.ar.type)
12042 /* Get the start position of array section. */
12043 gfc_get_section_index (ar, section_index, &offset);
12048 gcc_unreachable ();
12051 if (gfc_array_size (e, &size) == FAILURE)
12053 gfc_error ("Nonconstant array section at %L in DATA statement",
12055 mpz_clear (offset);
12062 while (mpz_cmp_ui (size, 0) > 0)
12064 if (next_data_value () == FAILURE)
12066 gfc_error ("DATA statement at %L has more variables than values",
12072 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12076 /* If we have more than one element left in the repeat count,
12077 and we have more than one element left in the target variable,
12078 then create a range assignment. */
12079 /* FIXME: Only done for full arrays for now, since array sections
12081 if (mark == AR_FULL && ref && ref->next == NULL
12082 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12086 if (mpz_cmp (size, values.left) >= 0)
12088 mpz_init_set (range, values.left);
12089 mpz_sub (size, size, values.left);
12090 mpz_set_ui (values.left, 0);
12094 mpz_init_set (range, size);
12095 mpz_sub (values.left, values.left, size);
12096 mpz_set_ui (size, 0);
12099 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
12102 mpz_add (offset, offset, range);
12109 /* Assign initial value to symbol. */
12112 mpz_sub_ui (values.left, values.left, 1);
12113 mpz_sub_ui (size, size, 1);
12115 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
12119 if (mark == AR_FULL)
12120 mpz_add_ui (offset, offset, 1);
12122 /* Modify the array section indexes and recalculate the offset
12123 for next element. */
12124 else if (mark == AR_SECTION)
12125 gfc_advance_section (section_index, ar, &offset);
12129 if (mark == AR_SECTION)
12131 for (i = 0; i < ar->dimen; i++)
12132 mpz_clear (section_index[i]);
12136 mpz_clear (offset);
12142 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12144 /* Iterate over a list of elements in a DATA statement. */
12147 traverse_data_list (gfc_data_variable *var, locus *where)
12150 iterator_stack frame;
12151 gfc_expr *e, *start, *end, *step;
12152 gfc_try retval = SUCCESS;
12154 mpz_init (frame.value);
12157 start = gfc_copy_expr (var->iter.start);
12158 end = gfc_copy_expr (var->iter.end);
12159 step = gfc_copy_expr (var->iter.step);
12161 if (gfc_simplify_expr (start, 1) == FAILURE
12162 || start->expr_type != EXPR_CONSTANT)
12164 gfc_error ("start of implied-do loop at %L could not be "
12165 "simplified to a constant value", &start->where);
12169 if (gfc_simplify_expr (end, 1) == FAILURE
12170 || end->expr_type != EXPR_CONSTANT)
12172 gfc_error ("end of implied-do loop at %L could not be "
12173 "simplified to a constant value", &start->where);
12177 if (gfc_simplify_expr (step, 1) == FAILURE
12178 || step->expr_type != EXPR_CONSTANT)
12180 gfc_error ("step of implied-do loop at %L could not be "
12181 "simplified to a constant value", &start->where);
12186 mpz_set (trip, end->value.integer);
12187 mpz_sub (trip, trip, start->value.integer);
12188 mpz_add (trip, trip, step->value.integer);
12190 mpz_div (trip, trip, step->value.integer);
12192 mpz_set (frame.value, start->value.integer);
12194 frame.prev = iter_stack;
12195 frame.variable = var->iter.var->symtree;
12196 iter_stack = &frame;
12198 while (mpz_cmp_ui (trip, 0) > 0)
12200 if (traverse_data_var (var->list, where) == FAILURE)
12206 e = gfc_copy_expr (var->expr);
12207 if (gfc_simplify_expr (e, 1) == FAILURE)
12214 mpz_add (frame.value, frame.value, step->value.integer);
12216 mpz_sub_ui (trip, trip, 1);
12220 mpz_clear (frame.value);
12223 gfc_free_expr (start);
12224 gfc_free_expr (end);
12225 gfc_free_expr (step);
12227 iter_stack = frame.prev;
12232 /* Type resolve variables in the variable list of a DATA statement. */
12235 traverse_data_var (gfc_data_variable *var, locus *where)
12239 for (; var; var = var->next)
12241 if (var->expr == NULL)
12242 t = traverse_data_list (var, where);
12244 t = check_data_variable (var, where);
12254 /* Resolve the expressions and iterators associated with a data statement.
12255 This is separate from the assignment checking because data lists should
12256 only be resolved once. */
12259 resolve_data_variables (gfc_data_variable *d)
12261 for (; d; d = d->next)
12263 if (d->list == NULL)
12265 if (gfc_resolve_expr (d->expr) == FAILURE)
12270 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12273 if (resolve_data_variables (d->list) == FAILURE)
12282 /* Resolve a single DATA statement. We implement this by storing a pointer to
12283 the value list into static variables, and then recursively traversing the
12284 variables list, expanding iterators and such. */
12287 resolve_data (gfc_data *d)
12290 if (resolve_data_variables (d->var) == FAILURE)
12293 values.vnode = d->value;
12294 if (d->value == NULL)
12295 mpz_set_ui (values.left, 0);
12297 mpz_set (values.left, d->value->repeat);
12299 if (traverse_data_var (d->var, &d->where) == FAILURE)
12302 /* At this point, we better not have any values left. */
12304 if (next_data_value () == SUCCESS)
12305 gfc_error ("DATA statement at %L has more values than variables",
12310 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12311 accessed by host or use association, is a dummy argument to a pure function,
12312 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12313 is storage associated with any such variable, shall not be used in the
12314 following contexts: (clients of this function). */
12316 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12317 procedure. Returns zero if assignment is OK, nonzero if there is a
12320 gfc_impure_variable (gfc_symbol *sym)
12325 if (sym->attr.use_assoc || sym->attr.in_common)
12328 /* Check if the symbol's ns is inside the pure procedure. */
12329 for (ns = gfc_current_ns; ns; ns = ns->parent)
12333 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12337 proc = sym->ns->proc_name;
12338 if (sym->attr.dummy && gfc_pure (proc)
12339 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12341 proc->attr.function))
12344 /* TODO: Sort out what can be storage associated, if anything, and include
12345 it here. In principle equivalences should be scanned but it does not
12346 seem to be possible to storage associate an impure variable this way. */
12351 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12352 current namespace is inside a pure procedure. */
12355 gfc_pure (gfc_symbol *sym)
12357 symbol_attribute attr;
12362 /* Check if the current namespace or one of its parents
12363 belongs to a pure procedure. */
12364 for (ns = gfc_current_ns; ns; ns = ns->parent)
12366 sym = ns->proc_name;
12370 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12378 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12382 /* Test whether the current procedure is elemental or not. */
12385 gfc_elemental (gfc_symbol *sym)
12387 symbol_attribute attr;
12390 sym = gfc_current_ns->proc_name;
12395 return attr.flavor == FL_PROCEDURE && attr.elemental;
12399 /* Warn about unused labels. */
12402 warn_unused_fortran_label (gfc_st_label *label)
12407 warn_unused_fortran_label (label->left);
12409 if (label->defined == ST_LABEL_UNKNOWN)
12412 switch (label->referenced)
12414 case ST_LABEL_UNKNOWN:
12415 gfc_warning ("Label %d at %L defined but not used", label->value,
12419 case ST_LABEL_BAD_TARGET:
12420 gfc_warning ("Label %d at %L defined but cannot be used",
12421 label->value, &label->where);
12428 warn_unused_fortran_label (label->right);
12432 /* Returns the sequence type of a symbol or sequence. */
12435 sequence_type (gfc_typespec ts)
12444 if (ts.u.derived->components == NULL)
12445 return SEQ_NONDEFAULT;
12447 result = sequence_type (ts.u.derived->components->ts);
12448 for (c = ts.u.derived->components->next; c; c = c->next)
12449 if (sequence_type (c->ts) != result)
12455 if (ts.kind != gfc_default_character_kind)
12456 return SEQ_NONDEFAULT;
12458 return SEQ_CHARACTER;
12461 if (ts.kind != gfc_default_integer_kind)
12462 return SEQ_NONDEFAULT;
12464 return SEQ_NUMERIC;
12467 if (!(ts.kind == gfc_default_real_kind
12468 || ts.kind == gfc_default_double_kind))
12469 return SEQ_NONDEFAULT;
12471 return SEQ_NUMERIC;
12474 if (ts.kind != gfc_default_complex_kind)
12475 return SEQ_NONDEFAULT;
12477 return SEQ_NUMERIC;
12480 if (ts.kind != gfc_default_logical_kind)
12481 return SEQ_NONDEFAULT;
12483 return SEQ_NUMERIC;
12486 return SEQ_NONDEFAULT;
12491 /* Resolve derived type EQUIVALENCE object. */
12494 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12496 gfc_component *c = derived->components;
12501 /* Shall not be an object of nonsequence derived type. */
12502 if (!derived->attr.sequence)
12504 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12505 "attribute to be an EQUIVALENCE object", sym->name,
12510 /* Shall not have allocatable components. */
12511 if (derived->attr.alloc_comp)
12513 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12514 "components to be an EQUIVALENCE object",sym->name,
12519 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
12521 gfc_error ("Derived type variable '%s' at %L with default "
12522 "initialization cannot be in EQUIVALENCE with a variable "
12523 "in COMMON", sym->name, &e->where);
12527 for (; c ; c = c->next)
12529 if (c->ts.type == BT_DERIVED
12530 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12533 /* Shall not be an object of sequence derived type containing a pointer
12534 in the structure. */
12535 if (c->attr.pointer)
12537 gfc_error ("Derived type variable '%s' at %L with pointer "
12538 "component(s) cannot be an EQUIVALENCE object",
12539 sym->name, &e->where);
12547 /* Resolve equivalence object.
12548 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12549 an allocatable array, an object of nonsequence derived type, an object of
12550 sequence derived type containing a pointer at any level of component
12551 selection, an automatic object, a function name, an entry name, a result
12552 name, a named constant, a structure component, or a subobject of any of
12553 the preceding objects. A substring shall not have length zero. A
12554 derived type shall not have components with default initialization nor
12555 shall two objects of an equivalence group be initialized.
12556 Either all or none of the objects shall have an protected attribute.
12557 The simple constraints are done in symbol.c(check_conflict) and the rest
12558 are implemented here. */
12561 resolve_equivalence (gfc_equiv *eq)
12564 gfc_symbol *first_sym;
12567 locus *last_where = NULL;
12568 seq_type eq_type, last_eq_type;
12569 gfc_typespec *last_ts;
12570 int object, cnt_protected;
12573 last_ts = &eq->expr->symtree->n.sym->ts;
12575 first_sym = eq->expr->symtree->n.sym;
12579 for (object = 1; eq; eq = eq->eq, object++)
12583 e->ts = e->symtree->n.sym->ts;
12584 /* match_varspec might not know yet if it is seeing
12585 array reference or substring reference, as it doesn't
12587 if (e->ref && e->ref->type == REF_ARRAY)
12589 gfc_ref *ref = e->ref;
12590 sym = e->symtree->n.sym;
12592 if (sym->attr.dimension)
12594 ref->u.ar.as = sym->as;
12598 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12599 if (e->ts.type == BT_CHARACTER
12601 && ref->type == REF_ARRAY
12602 && ref->u.ar.dimen == 1
12603 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12604 && ref->u.ar.stride[0] == NULL)
12606 gfc_expr *start = ref->u.ar.start[0];
12607 gfc_expr *end = ref->u.ar.end[0];
12610 /* Optimize away the (:) reference. */
12611 if (start == NULL && end == NULL)
12614 e->ref = ref->next;
12616 e->ref->next = ref->next;
12621 ref->type = REF_SUBSTRING;
12623 start = gfc_get_int_expr (gfc_default_integer_kind,
12625 ref->u.ss.start = start;
12626 if (end == NULL && e->ts.u.cl)
12627 end = gfc_copy_expr (e->ts.u.cl->length);
12628 ref->u.ss.end = end;
12629 ref->u.ss.length = e->ts.u.cl;
12636 /* Any further ref is an error. */
12639 gcc_assert (ref->type == REF_ARRAY);
12640 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12646 if (gfc_resolve_expr (e) == FAILURE)
12649 sym = e->symtree->n.sym;
12651 if (sym->attr.is_protected)
12653 if (cnt_protected > 0 && cnt_protected != object)
12655 gfc_error ("Either all or none of the objects in the "
12656 "EQUIVALENCE set at %L shall have the "
12657 "PROTECTED attribute",
12662 /* Shall not equivalence common block variables in a PURE procedure. */
12663 if (sym->ns->proc_name
12664 && sym->ns->proc_name->attr.pure
12665 && sym->attr.in_common)
12667 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12668 "object in the pure procedure '%s'",
12669 sym->name, &e->where, sym->ns->proc_name->name);
12673 /* Shall not be a named constant. */
12674 if (e->expr_type == EXPR_CONSTANT)
12676 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12677 "object", sym->name, &e->where);
12681 if (e->ts.type == BT_DERIVED
12682 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12685 /* Check that the types correspond correctly:
12687 A numeric sequence structure may be equivalenced to another sequence
12688 structure, an object of default integer type, default real type, double
12689 precision real type, default logical type such that components of the
12690 structure ultimately only become associated to objects of the same
12691 kind. A character sequence structure may be equivalenced to an object
12692 of default character kind or another character sequence structure.
12693 Other objects may be equivalenced only to objects of the same type and
12694 kind parameters. */
12696 /* Identical types are unconditionally OK. */
12697 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12698 goto identical_types;
12700 last_eq_type = sequence_type (*last_ts);
12701 eq_type = sequence_type (sym->ts);
12703 /* Since the pair of objects is not of the same type, mixed or
12704 non-default sequences can be rejected. */
12706 msg = "Sequence %s with mixed components in EQUIVALENCE "
12707 "statement at %L with different type objects";
12709 && last_eq_type == SEQ_MIXED
12710 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12712 || (eq_type == SEQ_MIXED
12713 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12714 &e->where) == FAILURE))
12717 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12718 "statement at %L with objects of different type";
12720 && last_eq_type == SEQ_NONDEFAULT
12721 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12722 last_where) == FAILURE)
12723 || (eq_type == SEQ_NONDEFAULT
12724 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12725 &e->where) == FAILURE))
12728 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12729 "EQUIVALENCE statement at %L";
12730 if (last_eq_type == SEQ_CHARACTER
12731 && eq_type != SEQ_CHARACTER
12732 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12733 &e->where) == FAILURE)
12736 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12737 "EQUIVALENCE statement at %L";
12738 if (last_eq_type == SEQ_NUMERIC
12739 && eq_type != SEQ_NUMERIC
12740 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12741 &e->where) == FAILURE)
12746 last_where = &e->where;
12751 /* Shall not be an automatic array. */
12752 if (e->ref->type == REF_ARRAY
12753 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12755 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12756 "an EQUIVALENCE object", sym->name, &e->where);
12763 /* Shall not be a structure component. */
12764 if (r->type == REF_COMPONENT)
12766 gfc_error ("Structure component '%s' at %L cannot be an "
12767 "EQUIVALENCE object",
12768 r->u.c.component->name, &e->where);
12772 /* A substring shall not have length zero. */
12773 if (r->type == REF_SUBSTRING)
12775 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12777 gfc_error ("Substring at %L has length zero",
12778 &r->u.ss.start->where);
12788 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12791 resolve_fntype (gfc_namespace *ns)
12793 gfc_entry_list *el;
12796 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12799 /* If there are any entries, ns->proc_name is the entry master
12800 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12802 sym = ns->entries->sym;
12804 sym = ns->proc_name;
12805 if (sym->result == sym
12806 && sym->ts.type == BT_UNKNOWN
12807 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12808 && !sym->attr.untyped)
12810 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12811 sym->name, &sym->declared_at);
12812 sym->attr.untyped = 1;
12815 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12816 && !sym->attr.contained
12817 && !gfc_check_access (sym->ts.u.derived->attr.access,
12818 sym->ts.u.derived->ns->default_access)
12819 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12821 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12822 "%L of PRIVATE type '%s'", sym->name,
12823 &sym->declared_at, sym->ts.u.derived->name);
12827 for (el = ns->entries->next; el; el = el->next)
12829 if (el->sym->result == el->sym
12830 && el->sym->ts.type == BT_UNKNOWN
12831 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12832 && !el->sym->attr.untyped)
12834 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12835 el->sym->name, &el->sym->declared_at);
12836 el->sym->attr.untyped = 1;
12842 /* 12.3.2.1.1 Defined operators. */
12845 check_uop_procedure (gfc_symbol *sym, locus where)
12847 gfc_formal_arglist *formal;
12849 if (!sym->attr.function)
12851 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12852 sym->name, &where);
12856 if (sym->ts.type == BT_CHARACTER
12857 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12858 && !(sym->result && sym->result->ts.u.cl
12859 && sym->result->ts.u.cl->length))
12861 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12862 "character length", sym->name, &where);
12866 formal = sym->formal;
12867 if (!formal || !formal->sym)
12869 gfc_error ("User operator procedure '%s' at %L must have at least "
12870 "one argument", sym->name, &where);
12874 if (formal->sym->attr.intent != INTENT_IN)
12876 gfc_error ("First argument of operator interface at %L must be "
12877 "INTENT(IN)", &where);
12881 if (formal->sym->attr.optional)
12883 gfc_error ("First argument of operator interface at %L cannot be "
12884 "optional", &where);
12888 formal = formal->next;
12889 if (!formal || !formal->sym)
12892 if (formal->sym->attr.intent != INTENT_IN)
12894 gfc_error ("Second argument of operator interface at %L must be "
12895 "INTENT(IN)", &where);
12899 if (formal->sym->attr.optional)
12901 gfc_error ("Second argument of operator interface at %L cannot be "
12902 "optional", &where);
12908 gfc_error ("Operator interface at %L must have, at most, two "
12909 "arguments", &where);
12917 gfc_resolve_uops (gfc_symtree *symtree)
12919 gfc_interface *itr;
12921 if (symtree == NULL)
12924 gfc_resolve_uops (symtree->left);
12925 gfc_resolve_uops (symtree->right);
12927 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12928 check_uop_procedure (itr->sym, itr->sym->declared_at);
12932 /* Examine all of the expressions associated with a program unit,
12933 assign types to all intermediate expressions, make sure that all
12934 assignments are to compatible types and figure out which names
12935 refer to which functions or subroutines. It doesn't check code
12936 block, which is handled by resolve_code. */
12939 resolve_types (gfc_namespace *ns)
12945 gfc_namespace* old_ns = gfc_current_ns;
12947 /* Check that all IMPLICIT types are ok. */
12948 if (!ns->seen_implicit_none)
12951 for (letter = 0; letter != GFC_LETTERS; ++letter)
12952 if (ns->set_flag[letter]
12953 && resolve_typespec_used (&ns->default_type[letter],
12954 &ns->implicit_loc[letter],
12959 gfc_current_ns = ns;
12961 resolve_entries (ns);
12963 resolve_common_vars (ns->blank_common.head, false);
12964 resolve_common_blocks (ns->common_root);
12966 resolve_contained_functions (ns);
12968 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12970 for (cl = ns->cl_list; cl; cl = cl->next)
12971 resolve_charlen (cl);
12973 gfc_traverse_ns (ns, resolve_symbol);
12975 resolve_fntype (ns);
12977 for (n = ns->contained; n; n = n->sibling)
12979 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12980 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12981 "also be PURE", n->proc_name->name,
12982 &n->proc_name->declared_at);
12988 gfc_check_interfaces (ns);
12990 gfc_traverse_ns (ns, resolve_values);
12996 for (d = ns->data; d; d = d->next)
13000 gfc_traverse_ns (ns, gfc_formalize_init_value);
13002 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13004 if (ns->common_root != NULL)
13005 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13007 for (eq = ns->equiv; eq; eq = eq->next)
13008 resolve_equivalence (eq);
13010 /* Warn about unused labels. */
13011 if (warn_unused_label)
13012 warn_unused_fortran_label (ns->st_labels);
13014 gfc_resolve_uops (ns->uop_root);
13016 gfc_current_ns = old_ns;
13020 /* Call resolve_code recursively. */
13023 resolve_codes (gfc_namespace *ns)
13026 bitmap_obstack old_obstack;
13028 for (n = ns->contained; n; n = n->sibling)
13031 gfc_current_ns = ns;
13033 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13034 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13037 /* Set to an out of range value. */
13038 current_entry_id = -1;
13040 old_obstack = labels_obstack;
13041 bitmap_obstack_initialize (&labels_obstack);
13043 resolve_code (ns->code, ns);
13045 bitmap_obstack_release (&labels_obstack);
13046 labels_obstack = old_obstack;
13050 /* This function is called after a complete program unit has been compiled.
13051 Its purpose is to examine all of the expressions associated with a program
13052 unit, assign types to all intermediate expressions, make sure that all
13053 assignments are to compatible types and figure out which names refer to
13054 which functions or subroutines. */
13057 gfc_resolve (gfc_namespace *ns)
13059 gfc_namespace *old_ns;
13060 code_stack *old_cs_base;
13066 old_ns = gfc_current_ns;
13067 old_cs_base = cs_base;
13069 resolve_types (ns);
13070 resolve_codes (ns);
13072 gfc_current_ns = old_ns;
13073 cs_base = old_cs_base;
13076 gfc_run_passes (ns);