1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
28 #include "arith.h" /* For gfc_compare_expr(). */
29 #include "dependency.h"
31 #include "target-memory.h" /* for gfc_simplify_transfer */
32 #include "constructor.h"
34 /* Types used in equivalence statements. */
38 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
42 /* Stack to keep track of the nesting of blocks as we move through the
43 code. See resolve_branch() and resolve_code(). */
45 typedef struct code_stack
47 struct gfc_code *head, *current;
48 struct code_stack *prev;
50 /* This bitmap keeps track of the targets valid for a branch from
51 inside this block except for END {IF|SELECT}s of enclosing
53 bitmap reachable_labels;
57 static code_stack *cs_base = NULL;
60 /* Nonzero if we're inside a FORALL block. */
62 static int forall_flag;
64 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
66 static int omp_workshare_flag;
68 /* Nonzero if we are processing a formal arglist. The corresponding function
69 resets the flag each time that it is read. */
70 static int formal_arg_flag = 0;
72 /* True if we are resolving a specification expression. */
73 static int specification_expr = 0;
75 /* The id of the last entry seen. */
76 static int current_entry_id;
78 /* We use bitmaps to determine if a branch target is valid. */
79 static bitmap_obstack labels_obstack;
81 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
82 static bool inquiry_argument = false;
85 gfc_is_formal_arg (void)
87 return formal_arg_flag;
90 /* Is the symbol host associated? */
92 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
94 for (ns = ns->parent; ns; ns = ns->parent)
103 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
104 an ABSTRACT derived-type. If where is not NULL, an error message with that
105 locus is printed, optionally using name. */
108 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
110 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
115 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
116 name, where, ts->u.derived->name);
118 gfc_error ("ABSTRACT type '%s' used at %L",
119 ts->u.derived->name, where);
129 /* Resolve types of formal argument lists. These have to be done early so that
130 the formal argument lists of module procedures can be copied to the
131 containing module before the individual procedures are resolved
132 individually. We also resolve argument lists of procedures in interface
133 blocks because they are self-contained scoping units.
135 Since a dummy argument cannot be a non-dummy procedure, the only
136 resort left for untyped names are the IMPLICIT types. */
139 resolve_formal_arglist (gfc_symbol *proc)
141 gfc_formal_arglist *f;
145 if (proc->result != NULL)
150 if (gfc_elemental (proc)
151 || sym->attr.pointer || sym->attr.allocatable
152 || (sym->as && sym->as->rank > 0))
154 proc->attr.always_explicit = 1;
155 sym->attr.always_explicit = 1;
160 for (f = proc->formal; f; f = f->next)
166 /* Alternate return placeholder. */
167 if (gfc_elemental (proc))
168 gfc_error ("Alternate return specifier in elemental subroutine "
169 "'%s' at %L is not allowed", proc->name,
171 if (proc->attr.function)
172 gfc_error ("Alternate return specifier in function "
173 "'%s' at %L is not allowed", proc->name,
178 if (sym->attr.if_source != IFSRC_UNKNOWN)
179 resolve_formal_arglist (sym);
181 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
183 if (gfc_pure (proc) && !gfc_pure (sym))
185 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
186 "also be PURE", sym->name, &sym->declared_at);
190 if (gfc_elemental (proc))
192 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
193 "procedure", &sym->declared_at);
197 if (sym->attr.function
198 && sym->ts.type == BT_UNKNOWN
199 && sym->attr.intrinsic)
201 gfc_intrinsic_sym *isym;
202 isym = gfc_find_function (sym->name);
203 if (isym == NULL || !isym->specific)
205 gfc_error ("Unable to find a specific INTRINSIC procedure "
206 "for the reference '%s' at %L", sym->name,
215 if (sym->ts.type == BT_UNKNOWN)
217 if (!sym->attr.function || sym->result == sym)
218 gfc_set_default_type (sym, 1, sym->ns);
221 gfc_resolve_array_spec (sym->as, 0);
223 /* We can't tell if an array with dimension (:) is assumed or deferred
224 shape until we know if it has the pointer or allocatable attributes.
226 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
227 && !(sym->attr.pointer || sym->attr.allocatable))
229 sym->as->type = AS_ASSUMED_SHAPE;
230 for (i = 0; i < sym->as->rank; i++)
231 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
235 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
236 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
237 || sym->attr.optional)
239 proc->attr.always_explicit = 1;
241 proc->result->attr.always_explicit = 1;
244 /* If the flavor is unknown at this point, it has to be a variable.
245 A procedure specification would have already set the type. */
247 if (sym->attr.flavor == FL_UNKNOWN)
248 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
250 if (gfc_pure (proc) && !sym->attr.pointer
251 && sym->attr.flavor != FL_PROCEDURE)
253 if (proc->attr.function && sym->attr.intent != INTENT_IN)
254 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
255 "INTENT(IN)", sym->name, proc->name,
258 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
259 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
260 "have its INTENT specified", sym->name, proc->name,
264 if (gfc_elemental (proc))
267 if (sym->attr.codimension)
269 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
270 "procedure", sym->name, &sym->declared_at);
276 gfc_error ("Argument '%s' of elemental procedure at %L must "
277 "be scalar", sym->name, &sym->declared_at);
281 if (sym->attr.pointer)
283 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
284 "have the POINTER attribute", sym->name,
289 if (sym->attr.flavor == FL_PROCEDURE)
291 gfc_error ("Dummy procedure '%s' not allowed in elemental "
292 "procedure '%s' at %L", sym->name, proc->name,
298 /* Each dummy shall be specified to be scalar. */
299 if (proc->attr.proc == PROC_ST_FUNCTION)
303 gfc_error ("Argument '%s' of statement function at %L must "
304 "be scalar", sym->name, &sym->declared_at);
308 if (sym->ts.type == BT_CHARACTER)
310 gfc_charlen *cl = sym->ts.u.cl;
311 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
313 gfc_error ("Character-valued argument '%s' of statement "
314 "function at %L must have constant length",
315 sym->name, &sym->declared_at);
325 /* Work function called when searching for symbols that have argument lists
326 associated with them. */
329 find_arglists (gfc_symbol *sym)
331 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
334 resolve_formal_arglist (sym);
338 /* Given a namespace, resolve all formal argument lists within the namespace.
342 resolve_formal_arglists (gfc_namespace *ns)
347 gfc_traverse_ns (ns, find_arglists);
352 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
356 /* If this namespace is not a function or an entry master function,
358 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
359 || sym->attr.entry_master)
362 /* Try to find out of what the return type is. */
363 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
365 t = gfc_set_default_type (sym->result, 0, ns);
367 if (t == FAILURE && !sym->result->attr.untyped)
369 if (sym->result == sym)
370 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
371 sym->name, &sym->declared_at);
372 else if (!sym->result->attr.proc_pointer)
373 gfc_error ("Result '%s' of contained function '%s' at %L has "
374 "no IMPLICIT type", sym->result->name, sym->name,
375 &sym->result->declared_at);
376 sym->result->attr.untyped = 1;
380 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
381 type, lists the only ways a character length value of * can be used:
382 dummy arguments of procedures, named constants, and function results
383 in external functions. Internal function results and results of module
384 procedures are not on this list, ergo, not permitted. */
386 if (sym->result->ts.type == BT_CHARACTER)
388 gfc_charlen *cl = sym->result->ts.u.cl;
389 if (!cl || !cl->length)
391 /* See if this is a module-procedure and adapt error message
394 gcc_assert (ns->parent && ns->parent->proc_name);
395 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
397 gfc_error ("Character-valued %s '%s' at %L must not be"
399 module_proc ? _("module procedure")
400 : _("internal function"),
401 sym->name, &sym->declared_at);
407 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
408 introduce duplicates. */
411 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
413 gfc_formal_arglist *f, *new_arglist;
416 for (; new_args != NULL; new_args = new_args->next)
418 new_sym = new_args->sym;
419 /* See if this arg is already in the formal argument list. */
420 for (f = proc->formal; f; f = f->next)
422 if (new_sym == f->sym)
429 /* Add a new argument. Argument order is not important. */
430 new_arglist = gfc_get_formal_arglist ();
431 new_arglist->sym = new_sym;
432 new_arglist->next = proc->formal;
433 proc->formal = new_arglist;
438 /* Flag the arguments that are not present in all entries. */
441 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
443 gfc_formal_arglist *f, *head;
446 for (f = proc->formal; f; f = f->next)
451 for (new_args = head; new_args; new_args = new_args->next)
453 if (new_args->sym == f->sym)
460 f->sym->attr.not_always_present = 1;
465 /* Resolve alternate entry points. If a symbol has multiple entry points we
466 create a new master symbol for the main routine, and turn the existing
467 symbol into an entry point. */
470 resolve_entries (gfc_namespace *ns)
472 gfc_namespace *old_ns;
476 char name[GFC_MAX_SYMBOL_LEN + 1];
477 static int master_count = 0;
479 if (ns->proc_name == NULL)
482 /* No need to do anything if this procedure doesn't have alternate entry
487 /* We may already have resolved alternate entry points. */
488 if (ns->proc_name->attr.entry_master)
491 /* If this isn't a procedure something has gone horribly wrong. */
492 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
494 /* Remember the current namespace. */
495 old_ns = gfc_current_ns;
499 /* Add the main entry point to the list of entry points. */
500 el = gfc_get_entry_list ();
501 el->sym = ns->proc_name;
503 el->next = ns->entries;
505 ns->proc_name->attr.entry = 1;
507 /* If it is a module function, it needs to be in the right namespace
508 so that gfc_get_fake_result_decl can gather up the results. The
509 need for this arose in get_proc_name, where these beasts were
510 left in their own namespace, to keep prior references linked to
511 the entry declaration.*/
512 if (ns->proc_name->attr.function
513 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
516 /* Do the same for entries where the master is not a module
517 procedure. These are retained in the module namespace because
518 of the module procedure declaration. */
519 for (el = el->next; el; el = el->next)
520 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
521 && el->sym->attr.mod_proc)
525 /* Add an entry statement for it. */
532 /* Create a new symbol for the master function. */
533 /* Give the internal function a unique name (within this file).
534 Also include the function name so the user has some hope of figuring
535 out what is going on. */
536 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
537 master_count++, ns->proc_name->name);
538 gfc_get_ha_symbol (name, &proc);
539 gcc_assert (proc != NULL);
541 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
542 if (ns->proc_name->attr.subroutine)
543 gfc_add_subroutine (&proc->attr, proc->name, NULL);
547 gfc_typespec *ts, *fts;
548 gfc_array_spec *as, *fas;
549 gfc_add_function (&proc->attr, proc->name, NULL);
551 fas = ns->entries->sym->as;
552 fas = fas ? fas : ns->entries->sym->result->as;
553 fts = &ns->entries->sym->result->ts;
554 if (fts->type == BT_UNKNOWN)
555 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
556 for (el = ns->entries->next; el; el = el->next)
558 ts = &el->sym->result->ts;
560 as = as ? as : el->sym->result->as;
561 if (ts->type == BT_UNKNOWN)
562 ts = gfc_get_default_type (el->sym->result->name, NULL);
564 if (! gfc_compare_types (ts, fts)
565 || (el->sym->result->attr.dimension
566 != ns->entries->sym->result->attr.dimension)
567 || (el->sym->result->attr.pointer
568 != ns->entries->sym->result->attr.pointer))
570 else if (as && fas && ns->entries->sym->result != el->sym->result
571 && gfc_compare_array_spec (as, fas) == 0)
572 gfc_error ("Function %s at %L has entries with mismatched "
573 "array specifications", ns->entries->sym->name,
574 &ns->entries->sym->declared_at);
575 /* The characteristics need to match and thus both need to have
576 the same string length, i.e. both len=*, or both len=4.
577 Having both len=<variable> is also possible, but difficult to
578 check at compile time. */
579 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
580 && (((ts->u.cl->length && !fts->u.cl->length)
581 ||(!ts->u.cl->length && fts->u.cl->length))
583 && ts->u.cl->length->expr_type
584 != fts->u.cl->length->expr_type)
586 && ts->u.cl->length->expr_type == EXPR_CONSTANT
587 && mpz_cmp (ts->u.cl->length->value.integer,
588 fts->u.cl->length->value.integer) != 0)))
589 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
590 "entries returning variables of different "
591 "string lengths", ns->entries->sym->name,
592 &ns->entries->sym->declared_at);
597 sym = ns->entries->sym->result;
598 /* All result types the same. */
600 if (sym->attr.dimension)
601 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
602 if (sym->attr.pointer)
603 gfc_add_pointer (&proc->attr, NULL);
607 /* Otherwise the result will be passed through a union by
609 proc->attr.mixed_entry_master = 1;
610 for (el = ns->entries; el; el = el->next)
612 sym = el->sym->result;
613 if (sym->attr.dimension)
615 if (el == ns->entries)
616 gfc_error ("FUNCTION result %s can't be an array in "
617 "FUNCTION %s at %L", sym->name,
618 ns->entries->sym->name, &sym->declared_at);
620 gfc_error ("ENTRY result %s can't be an array in "
621 "FUNCTION %s at %L", sym->name,
622 ns->entries->sym->name, &sym->declared_at);
624 else if (sym->attr.pointer)
626 if (el == ns->entries)
627 gfc_error ("FUNCTION result %s can't be a POINTER in "
628 "FUNCTION %s at %L", sym->name,
629 ns->entries->sym->name, &sym->declared_at);
631 gfc_error ("ENTRY result %s can't be a POINTER in "
632 "FUNCTION %s at %L", sym->name,
633 ns->entries->sym->name, &sym->declared_at);
638 if (ts->type == BT_UNKNOWN)
639 ts = gfc_get_default_type (sym->name, NULL);
643 if (ts->kind == gfc_default_integer_kind)
647 if (ts->kind == gfc_default_real_kind
648 || ts->kind == gfc_default_double_kind)
652 if (ts->kind == gfc_default_complex_kind)
656 if (ts->kind == gfc_default_logical_kind)
660 /* We will issue error elsewhere. */
668 if (el == ns->entries)
669 gfc_error ("FUNCTION result %s can't be of type %s "
670 "in FUNCTION %s at %L", sym->name,
671 gfc_typename (ts), ns->entries->sym->name,
674 gfc_error ("ENTRY result %s can't be of type %s "
675 "in FUNCTION %s at %L", sym->name,
676 gfc_typename (ts), ns->entries->sym->name,
683 proc->attr.access = ACCESS_PRIVATE;
684 proc->attr.entry_master = 1;
686 /* Merge all the entry point arguments. */
687 for (el = ns->entries; el; el = el->next)
688 merge_argument_lists (proc, el->sym->formal);
690 /* Check the master formal arguments for any that are not
691 present in all entry points. */
692 for (el = ns->entries; el; el = el->next)
693 check_argument_lists (proc, el->sym->formal);
695 /* Use the master function for the function body. */
696 ns->proc_name = proc;
698 /* Finalize the new symbols. */
699 gfc_commit_symbols ();
701 /* Restore the original namespace. */
702 gfc_current_ns = old_ns;
706 /* Resolve common variables. */
708 resolve_common_vars (gfc_symbol *sym, bool named_common)
710 gfc_symbol *csym = sym;
712 for (; csym; csym = csym->common_next)
714 if (csym->value || csym->attr.data)
716 if (!csym->ns->is_block_data)
717 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
718 "but only in BLOCK DATA initialization is "
719 "allowed", csym->name, &csym->declared_at);
720 else if (!named_common)
721 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
722 "in a blank COMMON but initialization is only "
723 "allowed in named common blocks", csym->name,
727 if (csym->ts.type != BT_DERIVED)
730 if (!(csym->ts.u.derived->attr.sequence
731 || csym->ts.u.derived->attr.is_bind_c))
732 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
733 "has neither the SEQUENCE nor the BIND(C) "
734 "attribute", csym->name, &csym->declared_at);
735 if (csym->ts.u.derived->attr.alloc_comp)
736 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
737 "has an ultimate component that is "
738 "allocatable", csym->name, &csym->declared_at);
739 if (gfc_has_default_initializer (csym->ts.u.derived))
740 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
741 "may not have default initializer", csym->name,
744 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
745 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
749 /* Resolve common blocks. */
751 resolve_common_blocks (gfc_symtree *common_root)
755 if (common_root == NULL)
758 if (common_root->left)
759 resolve_common_blocks (common_root->left);
760 if (common_root->right)
761 resolve_common_blocks (common_root->right);
763 resolve_common_vars (common_root->n.common->head, true);
765 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
769 if (sym->attr.flavor == FL_PARAMETER)
770 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
771 sym->name, &common_root->n.common->where, &sym->declared_at);
773 if (sym->attr.intrinsic)
774 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
775 sym->name, &common_root->n.common->where);
776 else if (sym->attr.result
777 || gfc_is_function_return_value (sym, gfc_current_ns))
778 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
779 "that is also a function result", sym->name,
780 &common_root->n.common->where);
781 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
782 && sym->attr.proc != PROC_ST_FUNCTION)
783 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
784 "that is also a global procedure", sym->name,
785 &common_root->n.common->where);
789 /* Resolve contained function types. Because contained functions can call one
790 another, they have to be worked out before any of the contained procedures
793 The good news is that if a function doesn't already have a type, the only
794 way it can get one is through an IMPLICIT type or a RESULT variable, because
795 by definition contained functions are contained namespace they're contained
796 in, not in a sibling or parent namespace. */
799 resolve_contained_functions (gfc_namespace *ns)
801 gfc_namespace *child;
804 resolve_formal_arglists (ns);
806 for (child = ns->contained; child; child = child->sibling)
808 /* Resolve alternate entry points first. */
809 resolve_entries (child);
811 /* Then check function return types. */
812 resolve_contained_fntype (child->proc_name, child);
813 for (el = child->entries; el; el = el->next)
814 resolve_contained_fntype (el->sym, child);
819 /* Resolve all of the elements of a structure constructor and make sure that
820 the types are correct. */
823 resolve_structure_cons (gfc_expr *expr)
825 gfc_constructor *cons;
831 cons = gfc_constructor_first (expr->value.constructor);
832 /* A constructor may have references if it is the result of substituting a
833 parameter variable. In this case we just pull out the component we
836 comp = expr->ref->u.c.sym->components;
838 comp = expr->ts.u.derived->components;
840 /* See if the user is trying to invoke a structure constructor for one of
841 the iso_c_binding derived types. */
842 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
843 && expr->ts.u.derived->ts.is_iso_c && cons
844 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
846 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
847 expr->ts.u.derived->name, &(expr->where));
851 /* Return if structure constructor is c_null_(fun)prt. */
852 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
853 && expr->ts.u.derived->ts.is_iso_c && cons
854 && cons->expr && cons->expr->expr_type == EXPR_NULL)
857 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
864 if (gfc_resolve_expr (cons->expr) == FAILURE)
870 rank = comp->as ? comp->as->rank : 0;
871 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
872 && (comp->attr.allocatable || cons->expr->rank))
874 gfc_error ("The rank of the element in the derived type "
875 "constructor at %L does not match that of the "
876 "component (%d/%d)", &cons->expr->where,
877 cons->expr->rank, rank);
881 /* If we don't have the right type, try to convert it. */
883 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
886 if (strcmp (comp->name, "$extends") == 0)
888 /* Can afford to be brutal with the $extends initializer.
889 The derived type can get lost because it is PRIVATE
890 but it is not usage constrained by the standard. */
891 cons->expr->ts = comp->ts;
894 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
895 gfc_error ("The element in the derived type constructor at %L, "
896 "for pointer component '%s', is %s but should be %s",
897 &cons->expr->where, comp->name,
898 gfc_basic_typename (cons->expr->ts.type),
899 gfc_basic_typename (comp->ts.type));
901 t = gfc_convert_type (cons->expr, &comp->ts, 1);
904 if (cons->expr->expr_type == EXPR_NULL
905 && !(comp->attr.pointer || comp->attr.allocatable
906 || comp->attr.proc_pointer
907 || (comp->ts.type == BT_CLASS
908 && (CLASS_DATA (comp)->attr.pointer
909 || CLASS_DATA (comp)->attr.allocatable))))
912 gfc_error ("The NULL in the derived type constructor at %L is "
913 "being applied to component '%s', which is neither "
914 "a POINTER nor ALLOCATABLE", &cons->expr->where,
918 if (!comp->attr.pointer || cons->expr->expr_type == EXPR_NULL)
921 a = gfc_expr_attr (cons->expr);
923 if (!a.pointer && !a.target)
926 gfc_error ("The element in the derived type constructor at %L, "
927 "for pointer component '%s' should be a POINTER or "
928 "a TARGET", &cons->expr->where, comp->name);
931 /* F2003, C1272 (3). */
932 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
933 && (gfc_impure_variable (cons->expr->symtree->n.sym)
934 || gfc_is_coindexed (cons->expr)))
937 gfc_error ("Invalid expression in the derived type constructor for "
938 "pointer component '%s' at %L in PURE procedure",
939 comp->name, &cons->expr->where);
947 /****************** Expression name resolution ******************/
949 /* Returns 0 if a symbol was not declared with a type or
950 attribute declaration statement, nonzero otherwise. */
953 was_declared (gfc_symbol *sym)
959 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
962 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
963 || a.optional || a.pointer || a.save || a.target || a.volatile_
964 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
965 || a.asynchronous || a.codimension)
972 /* Determine if a symbol is generic or not. */
975 generic_sym (gfc_symbol *sym)
979 if (sym->attr.generic ||
980 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
983 if (was_declared (sym) || sym->ns->parent == NULL)
986 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
993 return generic_sym (s);
1000 /* Determine if a symbol is specific or not. */
1003 specific_sym (gfc_symbol *sym)
1007 if (sym->attr.if_source == IFSRC_IFBODY
1008 || sym->attr.proc == PROC_MODULE
1009 || sym->attr.proc == PROC_INTERNAL
1010 || sym->attr.proc == PROC_ST_FUNCTION
1011 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1012 || sym->attr.external)
1015 if (was_declared (sym) || sym->ns->parent == NULL)
1018 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1020 return (s == NULL) ? 0 : specific_sym (s);
1024 /* Figure out if the procedure is specific, generic or unknown. */
1027 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1031 procedure_kind (gfc_symbol *sym)
1033 if (generic_sym (sym))
1034 return PTYPE_GENERIC;
1036 if (specific_sym (sym))
1037 return PTYPE_SPECIFIC;
1039 return PTYPE_UNKNOWN;
1042 /* Check references to assumed size arrays. The flag need_full_assumed_size
1043 is nonzero when matching actual arguments. */
1045 static int need_full_assumed_size = 0;
1048 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1050 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1053 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1054 What should it be? */
1055 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1056 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1057 && (e->ref->u.ar.type == AR_FULL))
1059 gfc_error ("The upper bound in the last dimension must "
1060 "appear in the reference to the assumed size "
1061 "array '%s' at %L", sym->name, &e->where);
1068 /* Look for bad assumed size array references in argument expressions
1069 of elemental and array valued intrinsic procedures. Since this is
1070 called from procedure resolution functions, it only recurses at
1074 resolve_assumed_size_actual (gfc_expr *e)
1079 switch (e->expr_type)
1082 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1087 if (resolve_assumed_size_actual (e->value.op.op1)
1088 || resolve_assumed_size_actual (e->value.op.op2))
1099 /* Check a generic procedure, passed as an actual argument, to see if
1100 there is a matching specific name. If none, it is an error, and if
1101 more than one, the reference is ambiguous. */
1103 count_specific_procs (gfc_expr *e)
1110 sym = e->symtree->n.sym;
1112 for (p = sym->generic; p; p = p->next)
1113 if (strcmp (sym->name, p->sym->name) == 0)
1115 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1121 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1125 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1126 "argument at %L", sym->name, &e->where);
1132 /* See if a call to sym could possibly be a not allowed RECURSION because of
1133 a missing RECURIVE declaration. This means that either sym is the current
1134 context itself, or sym is the parent of a contained procedure calling its
1135 non-RECURSIVE containing procedure.
1136 This also works if sym is an ENTRY. */
1139 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1141 gfc_symbol* proc_sym;
1142 gfc_symbol* context_proc;
1143 gfc_namespace* real_context;
1145 if (sym->attr.flavor == FL_PROGRAM)
1148 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1150 /* If we've got an ENTRY, find real procedure. */
1151 if (sym->attr.entry && sym->ns->entries)
1152 proc_sym = sym->ns->entries->sym;
1156 /* If sym is RECURSIVE, all is well of course. */
1157 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1160 /* Find the context procedure's "real" symbol if it has entries.
1161 We look for a procedure symbol, so recurse on the parents if we don't
1162 find one (like in case of a BLOCK construct). */
1163 for (real_context = context; ; real_context = real_context->parent)
1165 /* We should find something, eventually! */
1166 gcc_assert (real_context);
1168 context_proc = (real_context->entries ? real_context->entries->sym
1169 : real_context->proc_name);
1171 /* In some special cases, there may not be a proc_name, like for this
1173 real(bad_kind()) function foo () ...
1174 when checking the call to bad_kind ().
1175 In these cases, we simply return here and assume that the
1180 if (context_proc->attr.flavor != FL_LABEL)
1184 /* A call from sym's body to itself is recursion, of course. */
1185 if (context_proc == proc_sym)
1188 /* The same is true if context is a contained procedure and sym the
1190 if (context_proc->attr.contained)
1192 gfc_symbol* parent_proc;
1194 gcc_assert (context->parent);
1195 parent_proc = (context->parent->entries ? context->parent->entries->sym
1196 : context->parent->proc_name);
1198 if (parent_proc == proc_sym)
1206 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1207 its typespec and formal argument list. */
1210 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1212 gfc_intrinsic_sym* isym;
1218 /* We already know this one is an intrinsic, so we don't call
1219 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1220 gfc_find_subroutine directly to check whether it is a function or
1223 if ((isym = gfc_find_function (sym->name)))
1225 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1226 && !sym->attr.implicit_type)
1227 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1228 " ignored", sym->name, &sym->declared_at);
1230 if (!sym->attr.function &&
1231 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1236 else if ((isym = gfc_find_subroutine (sym->name)))
1238 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1240 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1241 " specifier", sym->name, &sym->declared_at);
1245 if (!sym->attr.subroutine &&
1246 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1251 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1256 gfc_copy_formal_args_intr (sym, isym);
1258 /* Check it is actually available in the standard settings. */
1259 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1262 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1263 " available in the current standard settings but %s. Use"
1264 " an appropriate -std=* option or enable -fall-intrinsics"
1265 " in order to use it.",
1266 sym->name, &sym->declared_at, symstd);
1274 /* Resolve a procedure expression, like passing it to a called procedure or as
1275 RHS for a procedure pointer assignment. */
1278 resolve_procedure_expression (gfc_expr* expr)
1282 if (expr->expr_type != EXPR_VARIABLE)
1284 gcc_assert (expr->symtree);
1286 sym = expr->symtree->n.sym;
1288 if (sym->attr.intrinsic)
1289 resolve_intrinsic (sym, &expr->where);
1291 if (sym->attr.flavor != FL_PROCEDURE
1292 || (sym->attr.function && sym->result == sym))
1295 /* A non-RECURSIVE procedure that is used as procedure expression within its
1296 own body is in danger of being called recursively. */
1297 if (is_illegal_recursion (sym, gfc_current_ns))
1298 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1299 " itself recursively. Declare it RECURSIVE or use"
1300 " -frecursive", sym->name, &expr->where);
1306 /* Resolve an actual argument list. Most of the time, this is just
1307 resolving the expressions in the list.
1308 The exception is that we sometimes have to decide whether arguments
1309 that look like procedure arguments are really simple variable
1313 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1314 bool no_formal_args)
1317 gfc_symtree *parent_st;
1319 int save_need_full_assumed_size;
1320 gfc_component *comp;
1322 for (; arg; arg = arg->next)
1327 /* Check the label is a valid branching target. */
1330 if (arg->label->defined == ST_LABEL_UNKNOWN)
1332 gfc_error ("Label %d referenced at %L is never defined",
1333 arg->label->value, &arg->label->where);
1340 if (gfc_is_proc_ptr_comp (e, &comp))
1343 if (e->expr_type == EXPR_PPC)
1345 if (comp->as != NULL)
1346 e->rank = comp->as->rank;
1347 e->expr_type = EXPR_FUNCTION;
1349 if (gfc_resolve_expr (e) == FAILURE)
1354 if (e->expr_type == EXPR_VARIABLE
1355 && e->symtree->n.sym->attr.generic
1357 && count_specific_procs (e) != 1)
1360 if (e->ts.type != BT_PROCEDURE)
1362 save_need_full_assumed_size = need_full_assumed_size;
1363 if (e->expr_type != EXPR_VARIABLE)
1364 need_full_assumed_size = 0;
1365 if (gfc_resolve_expr (e) != SUCCESS)
1367 need_full_assumed_size = save_need_full_assumed_size;
1371 /* See if the expression node should really be a variable reference. */
1373 sym = e->symtree->n.sym;
1375 if (sym->attr.flavor == FL_PROCEDURE
1376 || sym->attr.intrinsic
1377 || sym->attr.external)
1381 /* If a procedure is not already determined to be something else
1382 check if it is intrinsic. */
1383 if (!sym->attr.intrinsic
1384 && !(sym->attr.external || sym->attr.use_assoc
1385 || sym->attr.if_source == IFSRC_IFBODY)
1386 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1387 sym->attr.intrinsic = 1;
1389 if (sym->attr.proc == PROC_ST_FUNCTION)
1391 gfc_error ("Statement function '%s' at %L is not allowed as an "
1392 "actual argument", sym->name, &e->where);
1395 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1396 sym->attr.subroutine);
1397 if (sym->attr.intrinsic && actual_ok == 0)
1399 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1400 "actual argument", sym->name, &e->where);
1403 if (sym->attr.contained && !sym->attr.use_assoc
1404 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1406 gfc_error ("Internal procedure '%s' is not allowed as an "
1407 "actual argument at %L", sym->name, &e->where);
1410 if (sym->attr.elemental && !sym->attr.intrinsic)
1412 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1413 "allowed as an actual argument at %L", sym->name,
1417 /* Check if a generic interface has a specific procedure
1418 with the same name before emitting an error. */
1419 if (sym->attr.generic && count_specific_procs (e) != 1)
1422 /* Just in case a specific was found for the expression. */
1423 sym = e->symtree->n.sym;
1425 /* If the symbol is the function that names the current (or
1426 parent) scope, then we really have a variable reference. */
1428 if (gfc_is_function_return_value (sym, sym->ns))
1431 /* If all else fails, see if we have a specific intrinsic. */
1432 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1434 gfc_intrinsic_sym *isym;
1436 isym = gfc_find_function (sym->name);
1437 if (isym == NULL || !isym->specific)
1439 gfc_error ("Unable to find a specific INTRINSIC procedure "
1440 "for the reference '%s' at %L", sym->name,
1445 sym->attr.intrinsic = 1;
1446 sym->attr.function = 1;
1449 if (gfc_resolve_expr (e) == FAILURE)
1454 /* See if the name is a module procedure in a parent unit. */
1456 if (was_declared (sym) || sym->ns->parent == NULL)
1459 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1461 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1465 if (parent_st == NULL)
1468 sym = parent_st->n.sym;
1469 e->symtree = parent_st; /* Point to the right thing. */
1471 if (sym->attr.flavor == FL_PROCEDURE
1472 || sym->attr.intrinsic
1473 || sym->attr.external)
1475 if (gfc_resolve_expr (e) == FAILURE)
1481 e->expr_type = EXPR_VARIABLE;
1483 if (sym->as != NULL)
1485 e->rank = sym->as->rank;
1486 e->ref = gfc_get_ref ();
1487 e->ref->type = REF_ARRAY;
1488 e->ref->u.ar.type = AR_FULL;
1489 e->ref->u.ar.as = sym->as;
1492 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1493 primary.c (match_actual_arg). If above code determines that it
1494 is a variable instead, it needs to be resolved as it was not
1495 done at the beginning of this function. */
1496 save_need_full_assumed_size = need_full_assumed_size;
1497 if (e->expr_type != EXPR_VARIABLE)
1498 need_full_assumed_size = 0;
1499 if (gfc_resolve_expr (e) != SUCCESS)
1501 need_full_assumed_size = save_need_full_assumed_size;
1504 /* Check argument list functions %VAL, %LOC and %REF. There is
1505 nothing to do for %REF. */
1506 if (arg->name && arg->name[0] == '%')
1508 if (strncmp ("%VAL", arg->name, 4) == 0)
1510 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1512 gfc_error ("By-value argument at %L is not of numeric "
1519 gfc_error ("By-value argument at %L cannot be an array or "
1520 "an array section", &e->where);
1524 /* Intrinsics are still PROC_UNKNOWN here. However,
1525 since same file external procedures are not resolvable
1526 in gfortran, it is a good deal easier to leave them to
1528 if (ptype != PROC_UNKNOWN
1529 && ptype != PROC_DUMMY
1530 && ptype != PROC_EXTERNAL
1531 && ptype != PROC_MODULE)
1533 gfc_error ("By-value argument at %L is not allowed "
1534 "in this context", &e->where);
1539 /* Statement functions have already been excluded above. */
1540 else if (strncmp ("%LOC", arg->name, 4) == 0
1541 && e->ts.type == BT_PROCEDURE)
1543 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1545 gfc_error ("Passing internal procedure at %L by location "
1546 "not allowed", &e->where);
1552 /* Fortran 2008, C1237. */
1553 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1554 && gfc_has_ultimate_pointer (e))
1556 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1557 "component", &e->where);
1566 /* Do the checks of the actual argument list that are specific to elemental
1567 procedures. If called with c == NULL, we have a function, otherwise if
1568 expr == NULL, we have a subroutine. */
1571 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1573 gfc_actual_arglist *arg0;
1574 gfc_actual_arglist *arg;
1575 gfc_symbol *esym = NULL;
1576 gfc_intrinsic_sym *isym = NULL;
1578 gfc_intrinsic_arg *iformal = NULL;
1579 gfc_formal_arglist *eformal = NULL;
1580 bool formal_optional = false;
1581 bool set_by_optional = false;
1585 /* Is this an elemental procedure? */
1586 if (expr && expr->value.function.actual != NULL)
1588 if (expr->value.function.esym != NULL
1589 && expr->value.function.esym->attr.elemental)
1591 arg0 = expr->value.function.actual;
1592 esym = expr->value.function.esym;
1594 else if (expr->value.function.isym != NULL
1595 && expr->value.function.isym->elemental)
1597 arg0 = expr->value.function.actual;
1598 isym = expr->value.function.isym;
1603 else if (c && c->ext.actual != NULL)
1605 arg0 = c->ext.actual;
1607 if (c->resolved_sym)
1608 esym = c->resolved_sym;
1610 esym = c->symtree->n.sym;
1613 if (!esym->attr.elemental)
1619 /* The rank of an elemental is the rank of its array argument(s). */
1620 for (arg = arg0; arg; arg = arg->next)
1622 if (arg->expr != NULL && arg->expr->rank > 0)
1624 rank = arg->expr->rank;
1625 if (arg->expr->expr_type == EXPR_VARIABLE
1626 && arg->expr->symtree->n.sym->attr.optional)
1627 set_by_optional = true;
1629 /* Function specific; set the result rank and shape. */
1633 if (!expr->shape && arg->expr->shape)
1635 expr->shape = gfc_get_shape (rank);
1636 for (i = 0; i < rank; i++)
1637 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1644 /* If it is an array, it shall not be supplied as an actual argument
1645 to an elemental procedure unless an array of the same rank is supplied
1646 as an actual argument corresponding to a nonoptional dummy argument of
1647 that elemental procedure(12.4.1.5). */
1648 formal_optional = false;
1650 iformal = isym->formal;
1652 eformal = esym->formal;
1654 for (arg = arg0; arg; arg = arg->next)
1658 if (eformal->sym && eformal->sym->attr.optional)
1659 formal_optional = true;
1660 eformal = eformal->next;
1662 else if (isym && iformal)
1664 if (iformal->optional)
1665 formal_optional = true;
1666 iformal = iformal->next;
1669 formal_optional = true;
1671 if (pedantic && arg->expr != NULL
1672 && arg->expr->expr_type == EXPR_VARIABLE
1673 && arg->expr->symtree->n.sym->attr.optional
1676 && (set_by_optional || arg->expr->rank != rank)
1677 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1679 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1680 "MISSING, it cannot be the actual argument of an "
1681 "ELEMENTAL procedure unless there is a non-optional "
1682 "argument with the same rank (12.4.1.5)",
1683 arg->expr->symtree->n.sym->name, &arg->expr->where);
1688 for (arg = arg0; arg; arg = arg->next)
1690 if (arg->expr == NULL || arg->expr->rank == 0)
1693 /* Being elemental, the last upper bound of an assumed size array
1694 argument must be present. */
1695 if (resolve_assumed_size_actual (arg->expr))
1698 /* Elemental procedure's array actual arguments must conform. */
1701 if (gfc_check_conformance (arg->expr, e,
1702 "elemental procedure") == FAILURE)
1709 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1710 is an array, the intent inout/out variable needs to be also an array. */
1711 if (rank > 0 && esym && expr == NULL)
1712 for (eformal = esym->formal, arg = arg0; arg && eformal;
1713 arg = arg->next, eformal = eformal->next)
1714 if ((eformal->sym->attr.intent == INTENT_OUT
1715 || eformal->sym->attr.intent == INTENT_INOUT)
1716 && arg->expr && arg->expr->rank == 0)
1718 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1719 "ELEMENTAL subroutine '%s' is a scalar, but another "
1720 "actual argument is an array", &arg->expr->where,
1721 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1722 : "INOUT", eformal->sym->name, esym->name);
1729 /* Go through each actual argument in ACTUAL and see if it can be
1730 implemented as an inlined, non-copying intrinsic. FNSYM is the
1731 function being called, or NULL if not known. */
1734 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1736 gfc_actual_arglist *ap;
1739 for (ap = actual; ap; ap = ap->next)
1741 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1742 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual,
1744 ap->expr->inline_noncopying_intrinsic = 1;
1748 /* This function does the checking of references to global procedures
1749 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1750 77 and 95 standards. It checks for a gsymbol for the name, making
1751 one if it does not already exist. If it already exists, then the
1752 reference being resolved must correspond to the type of gsymbol.
1753 Otherwise, the new symbol is equipped with the attributes of the
1754 reference. The corresponding code that is called in creating
1755 global entities is parse.c.
1757 In addition, for all but -std=legacy, the gsymbols are used to
1758 check the interfaces of external procedures from the same file.
1759 The namespace of the gsymbol is resolved and then, once this is
1760 done the interface is checked. */
1764 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1766 if (!gsym_ns->proc_name->attr.recursive)
1769 if (sym->ns == gsym_ns)
1772 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1779 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1781 if (gsym_ns->entries)
1783 gfc_entry_list *entry = gsym_ns->entries;
1785 for (; entry; entry = entry->next)
1787 if (strcmp (sym->name, entry->sym->name) == 0)
1789 if (strcmp (gsym_ns->proc_name->name,
1790 sym->ns->proc_name->name) == 0)
1794 && strcmp (gsym_ns->proc_name->name,
1795 sym->ns->parent->proc_name->name) == 0)
1804 resolve_global_procedure (gfc_symbol *sym, locus *where,
1805 gfc_actual_arglist **actual, int sub)
1809 enum gfc_symbol_type type;
1811 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1813 gsym = gfc_get_gsymbol (sym->name);
1815 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1816 gfc_global_used (gsym, where);
1818 if (gfc_option.flag_whole_file
1819 && sym->attr.if_source == IFSRC_UNKNOWN
1820 && gsym->type != GSYM_UNKNOWN
1822 && gsym->ns->resolved != -1
1823 && gsym->ns->proc_name
1824 && not_in_recursive (sym, gsym->ns)
1825 && not_entry_self_reference (sym, gsym->ns))
1827 /* Resolve the gsymbol namespace if needed. */
1828 if (!gsym->ns->resolved)
1830 gfc_dt_list *old_dt_list;
1832 /* Stash away derived types so that the backend_decls do not
1834 old_dt_list = gfc_derived_types;
1835 gfc_derived_types = NULL;
1837 gfc_resolve (gsym->ns);
1839 /* Store the new derived types with the global namespace. */
1840 if (gfc_derived_types)
1841 gsym->ns->derived_types = gfc_derived_types;
1843 /* Restore the derived types of this namespace. */
1844 gfc_derived_types = old_dt_list;
1847 /* Make sure that translation for the gsymbol occurs before
1848 the procedure currently being resolved. */
1849 ns = gfc_global_ns_list;
1850 for (; ns && ns != gsym->ns; ns = ns->sibling)
1852 if (ns->sibling == gsym->ns)
1854 ns->sibling = gsym->ns->sibling;
1855 gsym->ns->sibling = gfc_global_ns_list;
1856 gfc_global_ns_list = gsym->ns;
1861 /* Differences in constant character lengths. */
1862 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
1864 long int l1 = 0, l2 = 0;
1865 gfc_charlen *cl1 = sym->ts.u.cl;
1866 gfc_charlen *cl2 = gsym->ns->proc_name->ts.u.cl;
1869 && cl1->length != NULL
1870 && cl1->length->expr_type == EXPR_CONSTANT)
1871 l1 = mpz_get_si (cl1->length->value.integer);
1874 && cl2->length != NULL
1875 && cl2->length->expr_type == EXPR_CONSTANT)
1876 l2 = mpz_get_si (cl2->length->value.integer);
1878 if (l1 && l2 && l1 != l2)
1879 gfc_error ("Character length mismatch in return type of "
1880 "function '%s' at %L (%ld/%ld)", sym->name,
1881 &sym->declared_at, l1, l2);
1884 /* Type mismatch of function return type and expected type. */
1885 if (sym->attr.function
1886 && !gfc_compare_types (&sym->ts, &gsym->ns->proc_name->ts))
1887 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
1888 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
1889 gfc_typename (&gsym->ns->proc_name->ts));
1891 if (gsym->ns->proc_name->formal)
1893 gfc_formal_arglist *arg = gsym->ns->proc_name->formal;
1894 for ( ; arg; arg = arg->next)
1897 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
1898 else if (arg->sym->attr.allocatable
1899 || arg->sym->attr.asynchronous
1900 || arg->sym->attr.optional
1901 || arg->sym->attr.pointer
1902 || arg->sym->attr.target
1903 || arg->sym->attr.value
1904 || arg->sym->attr.volatile_)
1906 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
1907 "has an attribute that requires an explicit "
1908 "interface for this procedure", arg->sym->name,
1909 sym->name, &sym->declared_at);
1912 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
1913 else if (arg->sym && arg->sym->as
1914 && arg->sym->as->type == AS_ASSUMED_SHAPE)
1916 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
1917 "argument '%s' must have an explicit interface",
1918 sym->name, &sym->declared_at, arg->sym->name);
1921 /* F2008, 12.4.2.2 (2c) */
1922 else if (arg->sym->attr.codimension)
1924 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
1925 "'%s' must have an explicit interface",
1926 sym->name, &sym->declared_at, arg->sym->name);
1929 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
1930 else if (false) /* TODO: is a parametrized derived type */
1932 gfc_error ("Procedure '%s' at %L with parametrized derived "
1933 "type argument '%s' must have an explicit "
1934 "interface", sym->name, &sym->declared_at,
1938 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
1939 else if (arg->sym->ts.type == BT_CLASS)
1941 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
1942 "argument '%s' must have an explicit interface",
1943 sym->name, &sym->declared_at, arg->sym->name);
1948 if (gsym->ns->proc_name->attr.function)
1950 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
1951 if (gsym->ns->proc_name->as
1952 && gsym->ns->proc_name->as->rank
1953 && (!sym->as || sym->as->rank != gsym->ns->proc_name->as->rank))
1954 gfc_error ("The reference to function '%s' at %L either needs an "
1955 "explicit INTERFACE or the rank is incorrect", sym->name,
1958 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
1959 if (gsym->ns->proc_name->result->attr.pointer
1960 || gsym->ns->proc_name->result->attr.allocatable)
1961 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
1962 "result must have an explicit interface", sym->name,
1965 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
1966 if (sym->ts.type == BT_CHARACTER
1967 && gsym->ns->proc_name->ts.u.cl->length != NULL)
1969 gfc_charlen *cl = sym->ts.u.cl;
1971 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
1972 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
1974 gfc_error ("Nonconstant character-length function '%s' at %L "
1975 "must have an explicit interface", sym->name,
1981 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
1982 if (gsym->ns->proc_name->attr.elemental)
1984 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
1985 "interface", sym->name, &sym->declared_at);
1988 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
1989 if (gsym->ns->proc_name->attr.is_bind_c)
1991 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
1992 "an explicit interface", sym->name, &sym->declared_at);
1995 if (gfc_option.flag_whole_file == 1
1996 || ((gfc_option.warn_std & GFC_STD_LEGACY)
1997 && !(gfc_option.warn_std & GFC_STD_GNU)))
1998 gfc_errors_to_warnings (1);
2000 gfc_procedure_use (gsym->ns->proc_name, actual, where);
2002 gfc_errors_to_warnings (0);
2005 if (gsym->type == GSYM_UNKNOWN)
2008 gsym->where = *where;
2015 /************* Function resolution *************/
2017 /* Resolve a function call known to be generic.
2018 Section 14.1.2.4.1. */
2021 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2025 if (sym->attr.generic)
2027 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2030 expr->value.function.name = s->name;
2031 expr->value.function.esym = s;
2033 if (s->ts.type != BT_UNKNOWN)
2035 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2036 expr->ts = s->result->ts;
2039 expr->rank = s->as->rank;
2040 else if (s->result != NULL && s->result->as != NULL)
2041 expr->rank = s->result->as->rank;
2043 gfc_set_sym_referenced (expr->value.function.esym);
2048 /* TODO: Need to search for elemental references in generic
2052 if (sym->attr.intrinsic)
2053 return gfc_intrinsic_func_interface (expr, 0);
2060 resolve_generic_f (gfc_expr *expr)
2065 sym = expr->symtree->n.sym;
2069 m = resolve_generic_f0 (expr, sym);
2072 else if (m == MATCH_ERROR)
2076 if (sym->ns->parent == NULL)
2078 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2082 if (!generic_sym (sym))
2086 /* Last ditch attempt. See if the reference is to an intrinsic
2087 that possesses a matching interface. 14.1.2.4 */
2088 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2090 gfc_error ("There is no specific function for the generic '%s' at %L",
2091 expr->symtree->n.sym->name, &expr->where);
2095 m = gfc_intrinsic_func_interface (expr, 0);
2099 gfc_error ("Generic function '%s' at %L is not consistent with a "
2100 "specific intrinsic interface", expr->symtree->n.sym->name,
2107 /* Resolve a function call known to be specific. */
2110 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2114 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2116 if (sym->attr.dummy)
2118 sym->attr.proc = PROC_DUMMY;
2122 sym->attr.proc = PROC_EXTERNAL;
2126 if (sym->attr.proc == PROC_MODULE
2127 || sym->attr.proc == PROC_ST_FUNCTION
2128 || sym->attr.proc == PROC_INTERNAL)
2131 if (sym->attr.intrinsic)
2133 m = gfc_intrinsic_func_interface (expr, 1);
2137 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2138 "with an intrinsic", sym->name, &expr->where);
2146 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2149 expr->ts = sym->result->ts;
2152 expr->value.function.name = sym->name;
2153 expr->value.function.esym = sym;
2154 if (sym->as != NULL)
2155 expr->rank = sym->as->rank;
2162 resolve_specific_f (gfc_expr *expr)
2167 sym = expr->symtree->n.sym;
2171 m = resolve_specific_f0 (sym, expr);
2174 if (m == MATCH_ERROR)
2177 if (sym->ns->parent == NULL)
2180 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2186 gfc_error ("Unable to resolve the specific function '%s' at %L",
2187 expr->symtree->n.sym->name, &expr->where);
2193 /* Resolve a procedure call not known to be generic nor specific. */
2196 resolve_unknown_f (gfc_expr *expr)
2201 sym = expr->symtree->n.sym;
2203 if (sym->attr.dummy)
2205 sym->attr.proc = PROC_DUMMY;
2206 expr->value.function.name = sym->name;
2210 /* See if we have an intrinsic function reference. */
2212 if (gfc_is_intrinsic (sym, 0, expr->where))
2214 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2219 /* The reference is to an external name. */
2221 sym->attr.proc = PROC_EXTERNAL;
2222 expr->value.function.name = sym->name;
2223 expr->value.function.esym = expr->symtree->n.sym;
2225 if (sym->as != NULL)
2226 expr->rank = sym->as->rank;
2228 /* Type of the expression is either the type of the symbol or the
2229 default type of the symbol. */
2232 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2234 if (sym->ts.type != BT_UNKNOWN)
2238 ts = gfc_get_default_type (sym->name, sym->ns);
2240 if (ts->type == BT_UNKNOWN)
2242 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2243 sym->name, &expr->where);
2254 /* Return true, if the symbol is an external procedure. */
2256 is_external_proc (gfc_symbol *sym)
2258 if (!sym->attr.dummy && !sym->attr.contained
2259 && !(sym->attr.intrinsic
2260 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2261 && sym->attr.proc != PROC_ST_FUNCTION
2262 && !sym->attr.proc_pointer
2263 && !sym->attr.use_assoc
2271 /* Figure out if a function reference is pure or not. Also set the name
2272 of the function for a potential error message. Return nonzero if the
2273 function is PURE, zero if not. */
2275 pure_stmt_function (gfc_expr *, gfc_symbol *);
2278 pure_function (gfc_expr *e, const char **name)
2284 if (e->symtree != NULL
2285 && e->symtree->n.sym != NULL
2286 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2287 return pure_stmt_function (e, e->symtree->n.sym);
2289 if (e->value.function.esym)
2291 pure = gfc_pure (e->value.function.esym);
2292 *name = e->value.function.esym->name;
2294 else if (e->value.function.isym)
2296 pure = e->value.function.isym->pure
2297 || e->value.function.isym->elemental;
2298 *name = e->value.function.isym->name;
2302 /* Implicit functions are not pure. */
2304 *name = e->value.function.name;
2312 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2313 int *f ATTRIBUTE_UNUSED)
2317 /* Don't bother recursing into other statement functions
2318 since they will be checked individually for purity. */
2319 if (e->expr_type != EXPR_FUNCTION
2321 || e->symtree->n.sym == sym
2322 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2325 return pure_function (e, &name) ? false : true;
2330 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2332 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2337 is_scalar_expr_ptr (gfc_expr *expr)
2339 gfc_try retval = SUCCESS;
2344 /* See if we have a gfc_ref, which means we have a substring, array
2345 reference, or a component. */
2346 if (expr->ref != NULL)
2349 while (ref->next != NULL)
2355 if (ref->u.ss.length != NULL
2356 && ref->u.ss.length->length != NULL
2358 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2360 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2362 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2363 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2364 if (end - start + 1 != 1)
2371 if (ref->u.ar.type == AR_ELEMENT)
2373 else if (ref->u.ar.type == AR_FULL)
2375 /* The user can give a full array if the array is of size 1. */
2376 if (ref->u.ar.as != NULL
2377 && ref->u.ar.as->rank == 1
2378 && ref->u.ar.as->type == AS_EXPLICIT
2379 && ref->u.ar.as->lower[0] != NULL
2380 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2381 && ref->u.ar.as->upper[0] != NULL
2382 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2384 /* If we have a character string, we need to check if
2385 its length is one. */
2386 if (expr->ts.type == BT_CHARACTER)
2388 if (expr->ts.u.cl == NULL
2389 || expr->ts.u.cl->length == NULL
2390 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2396 /* We have constant lower and upper bounds. If the
2397 difference between is 1, it can be considered a
2399 start = (int) mpz_get_si
2400 (ref->u.ar.as->lower[0]->value.integer);
2401 end = (int) mpz_get_si
2402 (ref->u.ar.as->upper[0]->value.integer);
2403 if (end - start + 1 != 1)
2418 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2420 /* Character string. Make sure it's of length 1. */
2421 if (expr->ts.u.cl == NULL
2422 || expr->ts.u.cl->length == NULL
2423 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2426 else if (expr->rank != 0)
2433 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2434 and, in the case of c_associated, set the binding label based on
2438 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2439 gfc_symbol **new_sym)
2441 char name[GFC_MAX_SYMBOL_LEN + 1];
2442 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2443 int optional_arg = 0, is_pointer = 0;
2444 gfc_try retval = SUCCESS;
2445 gfc_symbol *args_sym;
2446 gfc_typespec *arg_ts;
2448 if (args->expr->expr_type == EXPR_CONSTANT
2449 || args->expr->expr_type == EXPR_OP
2450 || args->expr->expr_type == EXPR_NULL)
2452 gfc_error ("Argument to '%s' at %L is not a variable",
2453 sym->name, &(args->expr->where));
2457 args_sym = args->expr->symtree->n.sym;
2459 /* The typespec for the actual arg should be that stored in the expr
2460 and not necessarily that of the expr symbol (args_sym), because
2461 the actual expression could be a part-ref of the expr symbol. */
2462 arg_ts = &(args->expr->ts);
2464 is_pointer = gfc_is_data_pointer (args->expr);
2466 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2468 /* If the user gave two args then they are providing something for
2469 the optional arg (the second cptr). Therefore, set the name and
2470 binding label to the c_associated for two cptrs. Otherwise,
2471 set c_associated to expect one cptr. */
2475 sprintf (name, "%s_2", sym->name);
2476 sprintf (binding_label, "%s_2", sym->binding_label);
2482 sprintf (name, "%s_1", sym->name);
2483 sprintf (binding_label, "%s_1", sym->binding_label);
2487 /* Get a new symbol for the version of c_associated that
2489 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2491 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2492 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2494 sprintf (name, "%s", sym->name);
2495 sprintf (binding_label, "%s", sym->binding_label);
2497 /* Error check the call. */
2498 if (args->next != NULL)
2500 gfc_error_now ("More actual than formal arguments in '%s' "
2501 "call at %L", name, &(args->expr->where));
2504 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2506 /* Make sure we have either the target or pointer attribute. */
2507 if (!args_sym->attr.target && !is_pointer)
2509 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2510 "a TARGET or an associated pointer",
2512 sym->name, &(args->expr->where));
2516 /* See if we have interoperable type and type param. */
2517 if (verify_c_interop (arg_ts) == SUCCESS
2518 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2520 if (args_sym->attr.target == 1)
2522 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2523 has the target attribute and is interoperable. */
2524 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2525 allocatable variable that has the TARGET attribute and
2526 is not an array of zero size. */
2527 if (args_sym->attr.allocatable == 1)
2529 if (args_sym->attr.dimension != 0
2530 && (args_sym->as && args_sym->as->rank == 0))
2532 gfc_error_now ("Allocatable variable '%s' used as a "
2533 "parameter to '%s' at %L must not be "
2534 "an array of zero size",
2535 args_sym->name, sym->name,
2536 &(args->expr->where));
2542 /* A non-allocatable target variable with C
2543 interoperable type and type parameters must be
2545 if (args_sym && args_sym->attr.dimension)
2547 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2549 gfc_error ("Assumed-shape array '%s' at %L "
2550 "cannot be an argument to the "
2551 "procedure '%s' because "
2552 "it is not C interoperable",
2554 &(args->expr->where), sym->name);
2557 else if (args_sym->as->type == AS_DEFERRED)
2559 gfc_error ("Deferred-shape array '%s' at %L "
2560 "cannot be an argument to the "
2561 "procedure '%s' because "
2562 "it is not C interoperable",
2564 &(args->expr->where), sym->name);
2569 /* Make sure it's not a character string. Arrays of
2570 any type should be ok if the variable is of a C
2571 interoperable type. */
2572 if (arg_ts->type == BT_CHARACTER)
2573 if (arg_ts->u.cl != NULL
2574 && (arg_ts->u.cl->length == NULL
2575 || arg_ts->u.cl->length->expr_type
2578 (arg_ts->u.cl->length->value.integer, 1)
2580 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2582 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2583 "at %L must have a length of 1",
2584 args_sym->name, sym->name,
2585 &(args->expr->where));
2591 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2593 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2595 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2596 "associated scalar POINTER", args_sym->name,
2597 sym->name, &(args->expr->where));
2603 /* The parameter is not required to be C interoperable. If it
2604 is not C interoperable, it must be a nonpolymorphic scalar
2605 with no length type parameters. It still must have either
2606 the pointer or target attribute, and it can be
2607 allocatable (but must be allocated when c_loc is called). */
2608 if (args->expr->rank != 0
2609 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2611 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2612 "scalar", args_sym->name, sym->name,
2613 &(args->expr->where));
2616 else if (arg_ts->type == BT_CHARACTER
2617 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2619 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2620 "%L must have a length of 1",
2621 args_sym->name, sym->name,
2622 &(args->expr->where));
2627 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2629 if (args_sym->attr.flavor != FL_PROCEDURE)
2631 /* TODO: Update this error message to allow for procedure
2632 pointers once they are implemented. */
2633 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2635 args_sym->name, sym->name,
2636 &(args->expr->where));
2639 else if (args_sym->attr.is_bind_c != 1)
2641 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2643 args_sym->name, sym->name,
2644 &(args->expr->where));
2649 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2654 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2655 "iso_c_binding function: '%s'!\n", sym->name);
2662 /* Resolve a function call, which means resolving the arguments, then figuring
2663 out which entity the name refers to. */
2664 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2665 to INTENT(OUT) or INTENT(INOUT). */
2668 resolve_function (gfc_expr *expr)
2670 gfc_actual_arglist *arg;
2675 procedure_type p = PROC_INTRINSIC;
2676 bool no_formal_args;
2680 sym = expr->symtree->n.sym;
2682 /* If this is a procedure pointer component, it has already been resolved. */
2683 if (gfc_is_proc_ptr_comp (expr, NULL))
2686 if (sym && sym->attr.intrinsic
2687 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2690 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2692 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2696 /* If this ia a deferred TBP with an abstract interface (which may
2697 of course be referenced), expr->value.function.esym will be set. */
2698 if (sym && sym->attr.abstract && !expr->value.function.esym)
2700 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2701 sym->name, &expr->where);
2705 /* Switch off assumed size checking and do this again for certain kinds
2706 of procedure, once the procedure itself is resolved. */
2707 need_full_assumed_size++;
2709 if (expr->symtree && expr->symtree->n.sym)
2710 p = expr->symtree->n.sym->attr.proc;
2712 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2713 inquiry_argument = true;
2714 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2716 if (resolve_actual_arglist (expr->value.function.actual,
2717 p, no_formal_args) == FAILURE)
2719 inquiry_argument = false;
2723 inquiry_argument = false;
2725 /* Need to setup the call to the correct c_associated, depending on
2726 the number of cptrs to user gives to compare. */
2727 if (sym && sym->attr.is_iso_c == 1)
2729 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2733 /* Get the symtree for the new symbol (resolved func).
2734 the old one will be freed later, when it's no longer used. */
2735 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2738 /* Resume assumed_size checking. */
2739 need_full_assumed_size--;
2741 /* If the procedure is external, check for usage. */
2742 if (sym && is_external_proc (sym))
2743 resolve_global_procedure (sym, &expr->where,
2744 &expr->value.function.actual, 0);
2746 if (sym && sym->ts.type == BT_CHARACTER
2748 && sym->ts.u.cl->length == NULL
2750 && expr->value.function.esym == NULL
2751 && !sym->attr.contained)
2753 /* Internal procedures are taken care of in resolve_contained_fntype. */
2754 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2755 "be used at %L since it is not a dummy argument",
2756 sym->name, &expr->where);
2760 /* See if function is already resolved. */
2762 if (expr->value.function.name != NULL)
2764 if (expr->ts.type == BT_UNKNOWN)
2770 /* Apply the rules of section 14.1.2. */
2772 switch (procedure_kind (sym))
2775 t = resolve_generic_f (expr);
2778 case PTYPE_SPECIFIC:
2779 t = resolve_specific_f (expr);
2783 t = resolve_unknown_f (expr);
2787 gfc_internal_error ("resolve_function(): bad function type");
2791 /* If the expression is still a function (it might have simplified),
2792 then we check to see if we are calling an elemental function. */
2794 if (expr->expr_type != EXPR_FUNCTION)
2797 temp = need_full_assumed_size;
2798 need_full_assumed_size = 0;
2800 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2803 if (omp_workshare_flag
2804 && expr->value.function.esym
2805 && ! gfc_elemental (expr->value.function.esym))
2807 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2808 "in WORKSHARE construct", expr->value.function.esym->name,
2813 #define GENERIC_ID expr->value.function.isym->id
2814 else if (expr->value.function.actual != NULL
2815 && expr->value.function.isym != NULL
2816 && GENERIC_ID != GFC_ISYM_LBOUND
2817 && GENERIC_ID != GFC_ISYM_LEN
2818 && GENERIC_ID != GFC_ISYM_LOC
2819 && GENERIC_ID != GFC_ISYM_PRESENT)
2821 /* Array intrinsics must also have the last upper bound of an
2822 assumed size array argument. UBOUND and SIZE have to be
2823 excluded from the check if the second argument is anything
2826 for (arg = expr->value.function.actual; arg; arg = arg->next)
2828 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2829 && arg->next != NULL && arg->next->expr)
2831 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2834 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2837 if ((int)mpz_get_si (arg->next->expr->value.integer)
2842 if (arg->expr != NULL
2843 && arg->expr->rank > 0
2844 && resolve_assumed_size_actual (arg->expr))
2850 need_full_assumed_size = temp;
2853 if (!pure_function (expr, &name) && name)
2857 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2858 "FORALL %s", name, &expr->where,
2859 forall_flag == 2 ? "mask" : "block");
2862 else if (gfc_pure (NULL))
2864 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2865 "procedure within a PURE procedure", name, &expr->where);
2870 /* Functions without the RECURSIVE attribution are not allowed to
2871 * call themselves. */
2872 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2875 esym = expr->value.function.esym;
2877 if (is_illegal_recursion (esym, gfc_current_ns))
2879 if (esym->attr.entry && esym->ns->entries)
2880 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2881 " function '%s' is not RECURSIVE",
2882 esym->name, &expr->where, esym->ns->entries->sym->name);
2884 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2885 " is not RECURSIVE", esym->name, &expr->where);
2891 /* Character lengths of use associated functions may contains references to
2892 symbols not referenced from the current program unit otherwise. Make sure
2893 those symbols are marked as referenced. */
2895 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2896 && expr->value.function.esym->attr.use_assoc)
2898 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2902 && !((expr->value.function.esym
2903 && expr->value.function.esym->attr.elemental)
2905 (expr->value.function.isym
2906 && expr->value.function.isym->elemental)))
2907 find_noncopying_intrinsics (expr->value.function.esym,
2908 expr->value.function.actual);
2910 /* Make sure that the expression has a typespec that works. */
2911 if (expr->ts.type == BT_UNKNOWN)
2913 if (expr->symtree->n.sym->result
2914 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2915 && !expr->symtree->n.sym->result->attr.proc_pointer)
2916 expr->ts = expr->symtree->n.sym->result->ts;
2923 /************* Subroutine resolution *************/
2926 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2932 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2933 sym->name, &c->loc);
2934 else if (gfc_pure (NULL))
2935 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2941 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2945 if (sym->attr.generic)
2947 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2950 c->resolved_sym = s;
2951 pure_subroutine (c, s);
2955 /* TODO: Need to search for elemental references in generic interface. */
2958 if (sym->attr.intrinsic)
2959 return gfc_intrinsic_sub_interface (c, 0);
2966 resolve_generic_s (gfc_code *c)
2971 sym = c->symtree->n.sym;
2975 m = resolve_generic_s0 (c, sym);
2978 else if (m == MATCH_ERROR)
2982 if (sym->ns->parent == NULL)
2984 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2988 if (!generic_sym (sym))
2992 /* Last ditch attempt. See if the reference is to an intrinsic
2993 that possesses a matching interface. 14.1.2.4 */
2994 sym = c->symtree->n.sym;
2996 if (!gfc_is_intrinsic (sym, 1, c->loc))
2998 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2999 sym->name, &c->loc);
3003 m = gfc_intrinsic_sub_interface (c, 0);
3007 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3008 "intrinsic subroutine interface", sym->name, &c->loc);
3014 /* Set the name and binding label of the subroutine symbol in the call
3015 expression represented by 'c' to include the type and kind of the
3016 second parameter. This function is for resolving the appropriate
3017 version of c_f_pointer() and c_f_procpointer(). For example, a
3018 call to c_f_pointer() for a default integer pointer could have a
3019 name of c_f_pointer_i4. If no second arg exists, which is an error
3020 for these two functions, it defaults to the generic symbol's name
3021 and binding label. */
3024 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3025 char *name, char *binding_label)
3027 gfc_expr *arg = NULL;
3031 /* The second arg of c_f_pointer and c_f_procpointer determines
3032 the type and kind for the procedure name. */
3033 arg = c->ext.actual->next->expr;
3037 /* Set up the name to have the given symbol's name,
3038 plus the type and kind. */
3039 /* a derived type is marked with the type letter 'u' */
3040 if (arg->ts.type == BT_DERIVED)
3043 kind = 0; /* set the kind as 0 for now */
3047 type = gfc_type_letter (arg->ts.type);
3048 kind = arg->ts.kind;
3051 if (arg->ts.type == BT_CHARACTER)
3052 /* Kind info for character strings not needed. */
3055 sprintf (name, "%s_%c%d", sym->name, type, kind);
3056 /* Set up the binding label as the given symbol's label plus
3057 the type and kind. */
3058 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3062 /* If the second arg is missing, set the name and label as
3063 was, cause it should at least be found, and the missing
3064 arg error will be caught by compare_parameters(). */
3065 sprintf (name, "%s", sym->name);
3066 sprintf (binding_label, "%s", sym->binding_label);
3073 /* Resolve a generic version of the iso_c_binding procedure given
3074 (sym) to the specific one based on the type and kind of the
3075 argument(s). Currently, this function resolves c_f_pointer() and
3076 c_f_procpointer based on the type and kind of the second argument
3077 (FPTR). Other iso_c_binding procedures aren't specially handled.
3078 Upon successfully exiting, c->resolved_sym will hold the resolved
3079 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3083 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3085 gfc_symbol *new_sym;
3086 /* this is fine, since we know the names won't use the max */
3087 char name[GFC_MAX_SYMBOL_LEN + 1];
3088 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3089 /* default to success; will override if find error */
3090 match m = MATCH_YES;
3092 /* Make sure the actual arguments are in the necessary order (based on the
3093 formal args) before resolving. */
3094 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3096 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3097 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3099 set_name_and_label (c, sym, name, binding_label);
3101 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3103 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3105 /* Make sure we got a third arg if the second arg has non-zero
3106 rank. We must also check that the type and rank are
3107 correct since we short-circuit this check in
3108 gfc_procedure_use() (called above to sort actual args). */
3109 if (c->ext.actual->next->expr->rank != 0)
3111 if(c->ext.actual->next->next == NULL
3112 || c->ext.actual->next->next->expr == NULL)
3115 gfc_error ("Missing SHAPE parameter for call to %s "
3116 "at %L", sym->name, &(c->loc));
3118 else if (c->ext.actual->next->next->expr->ts.type
3120 || c->ext.actual->next->next->expr->rank != 1)
3123 gfc_error ("SHAPE parameter for call to %s at %L must "
3124 "be a rank 1 INTEGER array", sym->name,
3131 if (m != MATCH_ERROR)
3133 /* the 1 means to add the optional arg to formal list */
3134 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3136 /* for error reporting, say it's declared where the original was */
3137 new_sym->declared_at = sym->declared_at;
3142 /* no differences for c_loc or c_funloc */
3146 /* set the resolved symbol */
3147 if (m != MATCH_ERROR)
3148 c->resolved_sym = new_sym;
3150 c->resolved_sym = sym;
3156 /* Resolve a subroutine call known to be specific. */
3159 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3163 if(sym->attr.is_iso_c)
3165 m = gfc_iso_c_sub_interface (c,sym);
3169 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3171 if (sym->attr.dummy)
3173 sym->attr.proc = PROC_DUMMY;
3177 sym->attr.proc = PROC_EXTERNAL;
3181 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3184 if (sym->attr.intrinsic)
3186 m = gfc_intrinsic_sub_interface (c, 1);
3190 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3191 "with an intrinsic", sym->name, &c->loc);
3199 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3201 c->resolved_sym = sym;
3202 pure_subroutine (c, sym);
3209 resolve_specific_s (gfc_code *c)
3214 sym = c->symtree->n.sym;
3218 m = resolve_specific_s0 (c, sym);
3221 if (m == MATCH_ERROR)
3224 if (sym->ns->parent == NULL)
3227 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3233 sym = c->symtree->n.sym;
3234 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3235 sym->name, &c->loc);
3241 /* Resolve a subroutine call not known to be generic nor specific. */
3244 resolve_unknown_s (gfc_code *c)
3248 sym = c->symtree->n.sym;
3250 if (sym->attr.dummy)
3252 sym->attr.proc = PROC_DUMMY;
3256 /* See if we have an intrinsic function reference. */
3258 if (gfc_is_intrinsic (sym, 1, c->loc))
3260 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3265 /* The reference is to an external name. */
3268 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3270 c->resolved_sym = sym;
3272 pure_subroutine (c, sym);
3278 /* Resolve a subroutine call. Although it was tempting to use the same code
3279 for functions, subroutines and functions are stored differently and this
3280 makes things awkward. */
3283 resolve_call (gfc_code *c)
3286 procedure_type ptype = PROC_INTRINSIC;
3287 gfc_symbol *csym, *sym;
3288 bool no_formal_args;
3290 csym = c->symtree ? c->symtree->n.sym : NULL;
3292 if (csym && csym->ts.type != BT_UNKNOWN)
3294 gfc_error ("'%s' at %L has a type, which is not consistent with "
3295 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3299 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3302 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3303 sym = st ? st->n.sym : NULL;
3304 if (sym && csym != sym
3305 && sym->ns == gfc_current_ns
3306 && sym->attr.flavor == FL_PROCEDURE
3307 && sym->attr.contained)
3310 if (csym->attr.generic)
3311 c->symtree->n.sym = sym;
3314 csym = c->symtree->n.sym;
3318 /* If this ia a deferred TBP with an abstract interface
3319 (which may of course be referenced), c->expr1 will be set. */
3320 if (csym && csym->attr.abstract && !c->expr1)
3322 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3323 csym->name, &c->loc);
3327 /* Subroutines without the RECURSIVE attribution are not allowed to
3328 * call themselves. */
3329 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3331 if (csym->attr.entry && csym->ns->entries)
3332 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3333 " subroutine '%s' is not RECURSIVE",
3334 csym->name, &c->loc, csym->ns->entries->sym->name);
3336 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3337 " is not RECURSIVE", csym->name, &c->loc);
3342 /* Switch off assumed size checking and do this again for certain kinds
3343 of procedure, once the procedure itself is resolved. */
3344 need_full_assumed_size++;
3347 ptype = csym->attr.proc;
3349 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3350 if (resolve_actual_arglist (c->ext.actual, ptype,
3351 no_formal_args) == FAILURE)
3354 /* Resume assumed_size checking. */
3355 need_full_assumed_size--;
3357 /* If external, check for usage. */
3358 if (csym && is_external_proc (csym))
3359 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3362 if (c->resolved_sym == NULL)
3364 c->resolved_isym = NULL;
3365 switch (procedure_kind (csym))
3368 t = resolve_generic_s (c);
3371 case PTYPE_SPECIFIC:
3372 t = resolve_specific_s (c);
3376 t = resolve_unknown_s (c);
3380 gfc_internal_error ("resolve_subroutine(): bad function type");
3384 /* Some checks of elemental subroutine actual arguments. */
3385 if (resolve_elemental_actual (NULL, c) == FAILURE)
3388 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3389 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3394 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3395 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3396 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3397 if their shapes do not match. If either op1->shape or op2->shape is
3398 NULL, return SUCCESS. */
3401 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3408 if (op1->shape != NULL && op2->shape != NULL)
3410 for (i = 0; i < op1->rank; i++)
3412 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3414 gfc_error ("Shapes for operands at %L and %L are not conformable",
3415 &op1->where, &op2->where);
3426 /* Resolve an operator expression node. This can involve replacing the
3427 operation with a user defined function call. */
3430 resolve_operator (gfc_expr *e)
3432 gfc_expr *op1, *op2;
3434 bool dual_locus_error;
3437 /* Resolve all subnodes-- give them types. */
3439 switch (e->value.op.op)
3442 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3445 /* Fall through... */
3448 case INTRINSIC_UPLUS:
3449 case INTRINSIC_UMINUS:
3450 case INTRINSIC_PARENTHESES:
3451 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3456 /* Typecheck the new node. */
3458 op1 = e->value.op.op1;
3459 op2 = e->value.op.op2;
3460 dual_locus_error = false;
3462 if ((op1 && op1->expr_type == EXPR_NULL)
3463 || (op2 && op2->expr_type == EXPR_NULL))
3465 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3469 switch (e->value.op.op)
3471 case INTRINSIC_UPLUS:
3472 case INTRINSIC_UMINUS:
3473 if (op1->ts.type == BT_INTEGER
3474 || op1->ts.type == BT_REAL
3475 || op1->ts.type == BT_COMPLEX)
3481 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3482 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3485 case INTRINSIC_PLUS:
3486 case INTRINSIC_MINUS:
3487 case INTRINSIC_TIMES:
3488 case INTRINSIC_DIVIDE:
3489 case INTRINSIC_POWER:
3490 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3492 gfc_type_convert_binary (e, 1);
3497 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3498 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3499 gfc_typename (&op2->ts));
3502 case INTRINSIC_CONCAT:
3503 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3504 && op1->ts.kind == op2->ts.kind)
3506 e->ts.type = BT_CHARACTER;
3507 e->ts.kind = op1->ts.kind;
3512 _("Operands of string concatenation operator at %%L are %s/%s"),
3513 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3519 case INTRINSIC_NEQV:
3520 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3522 e->ts.type = BT_LOGICAL;
3523 e->ts.kind = gfc_kind_max (op1, op2);
3524 if (op1->ts.kind < e->ts.kind)
3525 gfc_convert_type (op1, &e->ts, 2);
3526 else if (op2->ts.kind < e->ts.kind)
3527 gfc_convert_type (op2, &e->ts, 2);
3531 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3532 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3533 gfc_typename (&op2->ts));
3538 if (op1->ts.type == BT_LOGICAL)
3540 e->ts.type = BT_LOGICAL;
3541 e->ts.kind = op1->ts.kind;
3545 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3546 gfc_typename (&op1->ts));
3550 case INTRINSIC_GT_OS:
3552 case INTRINSIC_GE_OS:
3554 case INTRINSIC_LT_OS:
3556 case INTRINSIC_LE_OS:
3557 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3559 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3563 /* Fall through... */
3566 case INTRINSIC_EQ_OS:
3568 case INTRINSIC_NE_OS:
3569 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3570 && op1->ts.kind == op2->ts.kind)
3572 e->ts.type = BT_LOGICAL;
3573 e->ts.kind = gfc_default_logical_kind;
3577 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3579 gfc_type_convert_binary (e, 1);
3581 e->ts.type = BT_LOGICAL;
3582 e->ts.kind = gfc_default_logical_kind;
3586 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3588 _("Logicals at %%L must be compared with %s instead of %s"),
3589 (e->value.op.op == INTRINSIC_EQ
3590 || e->value.op.op == INTRINSIC_EQ_OS)
3591 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3594 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3595 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3596 gfc_typename (&op2->ts));
3600 case INTRINSIC_USER:
3601 if (e->value.op.uop->op == NULL)
3602 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3603 else if (op2 == NULL)
3604 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3605 e->value.op.uop->name, gfc_typename (&op1->ts));
3607 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3608 e->value.op.uop->name, gfc_typename (&op1->ts),
3609 gfc_typename (&op2->ts));
3613 case INTRINSIC_PARENTHESES:
3615 if (e->ts.type == BT_CHARACTER)
3616 e->ts.u.cl = op1->ts.u.cl;
3620 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3623 /* Deal with arrayness of an operand through an operator. */
3627 switch (e->value.op.op)
3629 case INTRINSIC_PLUS:
3630 case INTRINSIC_MINUS:
3631 case INTRINSIC_TIMES:
3632 case INTRINSIC_DIVIDE:
3633 case INTRINSIC_POWER:
3634 case INTRINSIC_CONCAT:
3638 case INTRINSIC_NEQV:
3640 case INTRINSIC_EQ_OS:
3642 case INTRINSIC_NE_OS:
3644 case INTRINSIC_GT_OS:
3646 case INTRINSIC_GE_OS:
3648 case INTRINSIC_LT_OS:
3650 case INTRINSIC_LE_OS:
3652 if (op1->rank == 0 && op2->rank == 0)
3655 if (op1->rank == 0 && op2->rank != 0)
3657 e->rank = op2->rank;
3659 if (e->shape == NULL)
3660 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3663 if (op1->rank != 0 && op2->rank == 0)
3665 e->rank = op1->rank;
3667 if (e->shape == NULL)
3668 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3671 if (op1->rank != 0 && op2->rank != 0)
3673 if (op1->rank == op2->rank)
3675 e->rank = op1->rank;
3676 if (e->shape == NULL)
3678 t = compare_shapes (op1, op2);
3682 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3687 /* Allow higher level expressions to work. */
3690 /* Try user-defined operators, and otherwise throw an error. */
3691 dual_locus_error = true;
3693 _("Inconsistent ranks for operator at %%L and %%L"));
3700 case INTRINSIC_PARENTHESES:
3702 case INTRINSIC_UPLUS:
3703 case INTRINSIC_UMINUS:
3704 /* Simply copy arrayness attribute */
3705 e->rank = op1->rank;
3707 if (e->shape == NULL)
3708 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3716 /* Attempt to simplify the expression. */
3719 t = gfc_simplify_expr (e, 0);
3720 /* Some calls do not succeed in simplification and return FAILURE
3721 even though there is no error; e.g. variable references to
3722 PARAMETER arrays. */
3723 if (!gfc_is_constant_expr (e))
3732 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3739 if (dual_locus_error)
3740 gfc_error (msg, &op1->where, &op2->where);
3742 gfc_error (msg, &e->where);
3748 /************** Array resolution subroutines **************/
3751 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3754 /* Compare two integer expressions. */
3757 compare_bound (gfc_expr *a, gfc_expr *b)
3761 if (a == NULL || a->expr_type != EXPR_CONSTANT
3762 || b == NULL || b->expr_type != EXPR_CONSTANT)
3765 /* If either of the types isn't INTEGER, we must have
3766 raised an error earlier. */
3768 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3771 i = mpz_cmp (a->value.integer, b->value.integer);
3781 /* Compare an integer expression with an integer. */
3784 compare_bound_int (gfc_expr *a, int b)
3788 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3791 if (a->ts.type != BT_INTEGER)
3792 gfc_internal_error ("compare_bound_int(): Bad expression");
3794 i = mpz_cmp_si (a->value.integer, b);
3804 /* Compare an integer expression with a mpz_t. */
3807 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3811 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3814 if (a->ts.type != BT_INTEGER)
3815 gfc_internal_error ("compare_bound_int(): Bad expression");
3817 i = mpz_cmp (a->value.integer, b);
3827 /* Compute the last value of a sequence given by a triplet.
3828 Return 0 if it wasn't able to compute the last value, or if the
3829 sequence if empty, and 1 otherwise. */
3832 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3833 gfc_expr *stride, mpz_t last)
3837 if (start == NULL || start->expr_type != EXPR_CONSTANT
3838 || end == NULL || end->expr_type != EXPR_CONSTANT
3839 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3842 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3843 || (stride != NULL && stride->ts.type != BT_INTEGER))
3846 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3848 if (compare_bound (start, end) == CMP_GT)
3850 mpz_set (last, end->value.integer);
3854 if (compare_bound_int (stride, 0) == CMP_GT)
3856 /* Stride is positive */
3857 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3862 /* Stride is negative */
3863 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3868 mpz_sub (rem, end->value.integer, start->value.integer);
3869 mpz_tdiv_r (rem, rem, stride->value.integer);
3870 mpz_sub (last, end->value.integer, rem);
3877 /* Compare a single dimension of an array reference to the array
3881 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3885 if (ar->dimen_type[i] == DIMEN_STAR)
3887 gcc_assert (ar->stride[i] == NULL);
3888 /* This implies [*] as [*:] and [*:3] are not possible. */
3889 if (ar->start[i] == NULL)
3891 gcc_assert (ar->end[i] == NULL);
3896 /* Given start, end and stride values, calculate the minimum and
3897 maximum referenced indexes. */
3899 switch (ar->dimen_type[i])
3906 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3909 gfc_warning ("Array reference at %L is out of bounds "
3910 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3911 mpz_get_si (ar->start[i]->value.integer),
3912 mpz_get_si (as->lower[i]->value.integer), i+1);
3914 gfc_warning ("Array reference at %L is out of bounds "
3915 "(%ld < %ld) in codimension %d", &ar->c_where[i],
3916 mpz_get_si (ar->start[i]->value.integer),
3917 mpz_get_si (as->lower[i]->value.integer),
3921 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3924 gfc_warning ("Array reference at %L is out of bounds "
3925 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3926 mpz_get_si (ar->start[i]->value.integer),
3927 mpz_get_si (as->upper[i]->value.integer), i+1);
3929 gfc_warning ("Array reference at %L is out of bounds "
3930 "(%ld > %ld) in codimension %d", &ar->c_where[i],
3931 mpz_get_si (ar->start[i]->value.integer),
3932 mpz_get_si (as->upper[i]->value.integer),
3941 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3942 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3944 comparison comp_start_end = compare_bound (AR_START, AR_END);
3946 /* Check for zero stride, which is not allowed. */
3947 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3949 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3953 /* if start == len || (stride > 0 && start < len)
3954 || (stride < 0 && start > len),
3955 then the array section contains at least one element. In this
3956 case, there is an out-of-bounds access if
3957 (start < lower || start > upper). */
3958 if (compare_bound (AR_START, AR_END) == CMP_EQ
3959 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3960 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3961 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3962 && comp_start_end == CMP_GT))
3964 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3966 gfc_warning ("Lower array reference at %L is out of bounds "
3967 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3968 mpz_get_si (AR_START->value.integer),
3969 mpz_get_si (as->lower[i]->value.integer), i+1);
3972 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3974 gfc_warning ("Lower array reference at %L is out of bounds "
3975 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3976 mpz_get_si (AR_START->value.integer),
3977 mpz_get_si (as->upper[i]->value.integer), i+1);
3982 /* If we can compute the highest index of the array section,
3983 then it also has to be between lower and upper. */
3984 mpz_init (last_value);
3985 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3988 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3990 gfc_warning ("Upper array reference at %L is out of bounds "
3991 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3992 mpz_get_si (last_value),
3993 mpz_get_si (as->lower[i]->value.integer), i+1);
3994 mpz_clear (last_value);
3997 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3999 gfc_warning ("Upper array reference at %L is out of bounds "
4000 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4001 mpz_get_si (last_value),
4002 mpz_get_si (as->upper[i]->value.integer), i+1);
4003 mpz_clear (last_value);
4007 mpz_clear (last_value);
4015 gfc_internal_error ("check_dimension(): Bad array reference");
4022 /* Compare an array reference with an array specification. */
4025 compare_spec_to_ref (gfc_array_ref *ar)
4032 /* TODO: Full array sections are only allowed as actual parameters. */
4033 if (as->type == AS_ASSUMED_SIZE
4034 && (/*ar->type == AR_FULL
4035 ||*/ (ar->type == AR_SECTION
4036 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4038 gfc_error ("Rightmost upper bound of assumed size array section "
4039 "not specified at %L", &ar->where);
4043 if (ar->type == AR_FULL)
4046 if (as->rank != ar->dimen)
4048 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4049 &ar->where, ar->dimen, as->rank);
4053 /* ar->codimen == 0 is a local array. */
4054 if (as->corank != ar->codimen && ar->codimen != 0)
4056 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4057 &ar->where, ar->codimen, as->corank);
4061 for (i = 0; i < as->rank; i++)
4062 if (check_dimension (i, ar, as) == FAILURE)
4065 /* Local access has no coarray spec. */
4066 if (ar->codimen != 0)
4067 for (i = as->rank; i < as->rank + as->corank; i++)
4069 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate)
4071 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4072 i + 1 - as->rank, &ar->where);
4075 if (check_dimension (i, ar, as) == FAILURE)
4083 /* Resolve one part of an array index. */
4086 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4087 int force_index_integer_kind)
4094 if (gfc_resolve_expr (index) == FAILURE)
4097 if (check_scalar && index->rank != 0)
4099 gfc_error ("Array index at %L must be scalar", &index->where);
4103 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4105 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4106 &index->where, gfc_basic_typename (index->ts.type));
4110 if (index->ts.type == BT_REAL)
4111 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4112 &index->where) == FAILURE)
4115 if ((index->ts.kind != gfc_index_integer_kind
4116 && force_index_integer_kind)
4117 || index->ts.type != BT_INTEGER)
4120 ts.type = BT_INTEGER;
4121 ts.kind = gfc_index_integer_kind;
4123 gfc_convert_type_warn (index, &ts, 2, 0);
4129 /* Resolve one part of an array index. */
4132 gfc_resolve_index (gfc_expr *index, int check_scalar)
4134 return gfc_resolve_index_1 (index, check_scalar, 1);
4137 /* Resolve a dim argument to an intrinsic function. */
4140 gfc_resolve_dim_arg (gfc_expr *dim)
4145 if (gfc_resolve_expr (dim) == FAILURE)
4150 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4155 if (dim->ts.type != BT_INTEGER)
4157 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4161 if (dim->ts.kind != gfc_index_integer_kind)
4166 ts.type = BT_INTEGER;
4167 ts.kind = gfc_index_integer_kind;
4169 gfc_convert_type_warn (dim, &ts, 2, 0);
4175 /* Given an expression that contains array references, update those array
4176 references to point to the right array specifications. While this is
4177 filled in during matching, this information is difficult to save and load
4178 in a module, so we take care of it here.
4180 The idea here is that the original array reference comes from the
4181 base symbol. We traverse the list of reference structures, setting
4182 the stored reference to references. Component references can
4183 provide an additional array specification. */
4186 find_array_spec (gfc_expr *e)
4190 gfc_symbol *derived;
4193 if (e->symtree->n.sym->ts.type == BT_CLASS)
4194 as = CLASS_DATA (e->symtree->n.sym)->as;
4196 as = e->symtree->n.sym->as;
4199 for (ref = e->ref; ref; ref = ref->next)
4204 gfc_internal_error ("find_array_spec(): Missing spec");
4211 if (derived == NULL)
4212 derived = e->symtree->n.sym->ts.u.derived;
4214 if (derived->attr.is_class)
4215 derived = derived->components->ts.u.derived;
4217 c = derived->components;
4219 for (; c; c = c->next)
4220 if (c == ref->u.c.component)
4222 /* Track the sequence of component references. */
4223 if (c->ts.type == BT_DERIVED)
4224 derived = c->ts.u.derived;
4229 gfc_internal_error ("find_array_spec(): Component not found");
4231 if (c->attr.dimension)
4234 gfc_internal_error ("find_array_spec(): unused as(1)");
4245 gfc_internal_error ("find_array_spec(): unused as(2)");
4249 /* Resolve an array reference. */
4252 resolve_array_ref (gfc_array_ref *ar)
4254 int i, check_scalar;
4257 for (i = 0; i < ar->dimen + ar->codimen; i++)
4259 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4261 /* Do not force gfc_index_integer_kind for the start. We can
4262 do fine with any integer kind. This avoids temporary arrays
4263 created for indexing with a vector. */
4264 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4266 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4268 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4273 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4277 ar->dimen_type[i] = DIMEN_ELEMENT;
4281 ar->dimen_type[i] = DIMEN_VECTOR;
4282 if (e->expr_type == EXPR_VARIABLE
4283 && e->symtree->n.sym->ts.type == BT_DERIVED)
4284 ar->start[i] = gfc_get_parentheses (e);
4288 gfc_error ("Array index at %L is an array of rank %d",
4289 &ar->c_where[i], e->rank);
4294 if (ar->type == AR_FULL && ar->as->rank == 0)
4295 ar->type = AR_ELEMENT;
4297 /* If the reference type is unknown, figure out what kind it is. */
4299 if (ar->type == AR_UNKNOWN)
4301 ar->type = AR_ELEMENT;
4302 for (i = 0; i < ar->dimen; i++)
4303 if (ar->dimen_type[i] == DIMEN_RANGE
4304 || ar->dimen_type[i] == DIMEN_VECTOR)
4306 ar->type = AR_SECTION;
4311 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4319 resolve_substring (gfc_ref *ref)
4321 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4323 if (ref->u.ss.start != NULL)
4325 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4328 if (ref->u.ss.start->ts.type != BT_INTEGER)
4330 gfc_error ("Substring start index at %L must be of type INTEGER",
4331 &ref->u.ss.start->where);
4335 if (ref->u.ss.start->rank != 0)
4337 gfc_error ("Substring start index at %L must be scalar",
4338 &ref->u.ss.start->where);
4342 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4343 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4344 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4346 gfc_error ("Substring start index at %L is less than one",
4347 &ref->u.ss.start->where);
4352 if (ref->u.ss.end != NULL)
4354 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4357 if (ref->u.ss.end->ts.type != BT_INTEGER)
4359 gfc_error ("Substring end index at %L must be of type INTEGER",
4360 &ref->u.ss.end->where);
4364 if (ref->u.ss.end->rank != 0)
4366 gfc_error ("Substring end index at %L must be scalar",
4367 &ref->u.ss.end->where);
4371 if (ref->u.ss.length != NULL
4372 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4373 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4374 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4376 gfc_error ("Substring end index at %L exceeds the string length",
4377 &ref->u.ss.start->where);
4381 if (compare_bound_mpz_t (ref->u.ss.end,
4382 gfc_integer_kinds[k].huge) == CMP_GT
4383 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4384 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4386 gfc_error ("Substring end index at %L is too large",
4387 &ref->u.ss.end->where);
4396 /* This function supplies missing substring charlens. */
4399 gfc_resolve_substring_charlen (gfc_expr *e)
4402 gfc_expr *start, *end;
4404 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4405 if (char_ref->type == REF_SUBSTRING)
4411 gcc_assert (char_ref->next == NULL);
4415 if (e->ts.u.cl->length)
4416 gfc_free_expr (e->ts.u.cl->length);
4417 else if (e->expr_type == EXPR_VARIABLE
4418 && e->symtree->n.sym->attr.dummy)
4422 e->ts.type = BT_CHARACTER;
4423 e->ts.kind = gfc_default_character_kind;
4426 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4428 if (char_ref->u.ss.start)
4429 start = gfc_copy_expr (char_ref->u.ss.start);
4431 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4433 if (char_ref->u.ss.end)
4434 end = gfc_copy_expr (char_ref->u.ss.end);
4435 else if (e->expr_type == EXPR_VARIABLE)
4436 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4443 /* Length = (end - start +1). */
4444 e->ts.u.cl->length = gfc_subtract (end, start);
4445 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4446 gfc_get_int_expr (gfc_default_integer_kind,
4449 e->ts.u.cl->length->ts.type = BT_INTEGER;
4450 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4452 /* Make sure that the length is simplified. */
4453 gfc_simplify_expr (e->ts.u.cl->length, 1);
4454 gfc_resolve_expr (e->ts.u.cl->length);
4458 /* Resolve subtype references. */
4461 resolve_ref (gfc_expr *expr)
4463 int current_part_dimension, n_components, seen_part_dimension;
4466 for (ref = expr->ref; ref; ref = ref->next)
4467 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4469 find_array_spec (expr);
4473 for (ref = expr->ref; ref; ref = ref->next)
4477 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4485 resolve_substring (ref);
4489 /* Check constraints on part references. */
4491 current_part_dimension = 0;
4492 seen_part_dimension = 0;
4495 for (ref = expr->ref; ref; ref = ref->next)
4500 switch (ref->u.ar.type)
4503 /* Coarray scalar. */
4504 if (ref->u.ar.as->rank == 0)
4506 current_part_dimension = 0;
4511 current_part_dimension = 1;
4515 current_part_dimension = 0;
4519 gfc_internal_error ("resolve_ref(): Bad array reference");
4525 if (current_part_dimension || seen_part_dimension)
4528 if (ref->u.c.component->attr.pointer
4529 || ref->u.c.component->attr.proc_pointer)
4531 gfc_error ("Component to the right of a part reference "
4532 "with nonzero rank must not have the POINTER "
4533 "attribute at %L", &expr->where);
4536 else if (ref->u.c.component->attr.allocatable)
4538 gfc_error ("Component to the right of a part reference "
4539 "with nonzero rank must not have the ALLOCATABLE "
4540 "attribute at %L", &expr->where);
4552 if (((ref->type == REF_COMPONENT && n_components > 1)
4553 || ref->next == NULL)
4554 && current_part_dimension
4555 && seen_part_dimension)
4557 gfc_error ("Two or more part references with nonzero rank must "
4558 "not be specified at %L", &expr->where);
4562 if (ref->type == REF_COMPONENT)
4564 if (current_part_dimension)
4565 seen_part_dimension = 1;
4567 /* reset to make sure */
4568 current_part_dimension = 0;
4576 /* Given an expression, determine its shape. This is easier than it sounds.
4577 Leaves the shape array NULL if it is not possible to determine the shape. */
4580 expression_shape (gfc_expr *e)
4582 mpz_t array[GFC_MAX_DIMENSIONS];
4585 if (e->rank == 0 || e->shape != NULL)
4588 for (i = 0; i < e->rank; i++)
4589 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4592 e->shape = gfc_get_shape (e->rank);
4594 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4599 for (i--; i >= 0; i--)
4600 mpz_clear (array[i]);
4604 /* Given a variable expression node, compute the rank of the expression by
4605 examining the base symbol and any reference structures it may have. */
4608 expression_rank (gfc_expr *e)
4613 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4614 could lead to serious confusion... */
4615 gcc_assert (e->expr_type != EXPR_COMPCALL);
4619 if (e->expr_type == EXPR_ARRAY)
4621 /* Constructors can have a rank different from one via RESHAPE(). */
4623 if (e->symtree == NULL)
4629 e->rank = (e->symtree->n.sym->as == NULL)
4630 ? 0 : e->symtree->n.sym->as->rank;
4636 for (ref = e->ref; ref; ref = ref->next)
4638 if (ref->type != REF_ARRAY)
4641 if (ref->u.ar.type == AR_FULL)
4643 rank = ref->u.ar.as->rank;
4647 if (ref->u.ar.type == AR_SECTION)
4649 /* Figure out the rank of the section. */
4651 gfc_internal_error ("expression_rank(): Two array specs");
4653 for (i = 0; i < ref->u.ar.dimen; i++)
4654 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4655 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4665 expression_shape (e);
4669 /* Resolve a variable expression. */
4672 resolve_variable (gfc_expr *e)
4679 if (e->symtree == NULL)
4682 if (e->ref && resolve_ref (e) == FAILURE)
4685 sym = e->symtree->n.sym;
4686 if (sym->attr.flavor == FL_PROCEDURE
4687 && (!sym->attr.function
4688 || (sym->attr.function && sym->result
4689 && sym->result->attr.proc_pointer
4690 && !sym->result->attr.function)))
4692 e->ts.type = BT_PROCEDURE;
4693 goto resolve_procedure;
4696 if (sym->ts.type != BT_UNKNOWN)
4697 gfc_variable_attr (e, &e->ts);
4700 /* Must be a simple variable reference. */
4701 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4706 if (check_assumed_size_reference (sym, e))
4709 /* Deal with forward references to entries during resolve_code, to
4710 satisfy, at least partially, 12.5.2.5. */
4711 if (gfc_current_ns->entries
4712 && current_entry_id == sym->entry_id
4715 && cs_base->current->op != EXEC_ENTRY)
4717 gfc_entry_list *entry;
4718 gfc_formal_arglist *formal;
4722 /* If the symbol is a dummy... */
4723 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4725 entry = gfc_current_ns->entries;
4728 /* ...test if the symbol is a parameter of previous entries. */
4729 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4730 for (formal = entry->sym->formal; formal; formal = formal->next)
4732 if (formal->sym && sym->name == formal->sym->name)
4736 /* If it has not been seen as a dummy, this is an error. */
4739 if (specification_expr)
4740 gfc_error ("Variable '%s', used in a specification expression"
4741 ", is referenced at %L before the ENTRY statement "
4742 "in which it is a parameter",
4743 sym->name, &cs_base->current->loc);
4745 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4746 "statement in which it is a parameter",
4747 sym->name, &cs_base->current->loc);
4752 /* Now do the same check on the specification expressions. */
4753 specification_expr = 1;
4754 if (sym->ts.type == BT_CHARACTER
4755 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4759 for (n = 0; n < sym->as->rank; n++)
4761 specification_expr = 1;
4762 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4764 specification_expr = 1;
4765 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4768 specification_expr = 0;
4771 /* Update the symbol's entry level. */
4772 sym->entry_id = current_entry_id + 1;
4775 /* If a symbol has been host_associated mark it. This is used latter,
4776 to identify if aliasing is possible via host association. */
4777 if (sym->attr.flavor == FL_VARIABLE
4778 && gfc_current_ns->parent
4779 && (gfc_current_ns->parent == sym->ns
4780 || (gfc_current_ns->parent->parent
4781 && gfc_current_ns->parent->parent == sym->ns)))
4782 sym->attr.host_assoc = 1;
4785 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4788 /* F2008, C617 and C1229. */
4789 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
4790 && gfc_is_coindexed (e))
4792 gfc_ref *ref, *ref2 = NULL;
4794 if (e->ts.type == BT_CLASS)
4796 gfc_error ("Polymorphic subobject of coindexed object at %L",
4801 for (ref = e->ref; ref; ref = ref->next)
4803 if (ref->type == REF_COMPONENT)
4805 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4809 for ( ; ref; ref = ref->next)
4810 if (ref->type == REF_COMPONENT)
4813 /* Expression itself is coindexed object. */
4817 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
4818 for ( ; c; c = c->next)
4819 if (c->attr.allocatable && c->ts.type == BT_CLASS)
4821 gfc_error ("Coindexed object with polymorphic allocatable "
4822 "subcomponent at %L", &e->where);
4833 /* Checks to see that the correct symbol has been host associated.
4834 The only situation where this arises is that in which a twice
4835 contained function is parsed after the host association is made.
4836 Therefore, on detecting this, change the symbol in the expression
4837 and convert the array reference into an actual arglist if the old
4838 symbol is a variable. */
4840 check_host_association (gfc_expr *e)
4842 gfc_symbol *sym, *old_sym;
4846 gfc_actual_arglist *arg, *tail = NULL;
4847 bool retval = e->expr_type == EXPR_FUNCTION;
4849 /* If the expression is the result of substitution in
4850 interface.c(gfc_extend_expr) because there is no way in
4851 which the host association can be wrong. */
4852 if (e->symtree == NULL
4853 || e->symtree->n.sym == NULL
4854 || e->user_operator)
4857 old_sym = e->symtree->n.sym;
4859 if (gfc_current_ns->parent
4860 && old_sym->ns != gfc_current_ns)
4862 /* Use the 'USE' name so that renamed module symbols are
4863 correctly handled. */
4864 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4866 if (sym && old_sym != sym
4867 && sym->ts.type == old_sym->ts.type
4868 && sym->attr.flavor == FL_PROCEDURE
4869 && sym->attr.contained)
4871 /* Clear the shape, since it might not be valid. */
4872 if (e->shape != NULL)
4874 for (n = 0; n < e->rank; n++)
4875 mpz_clear (e->shape[n]);
4877 gfc_free (e->shape);
4880 /* Give the expression the right symtree! */
4881 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4882 gcc_assert (st != NULL);
4884 if (old_sym->attr.flavor == FL_PROCEDURE
4885 || e->expr_type == EXPR_FUNCTION)
4887 /* Original was function so point to the new symbol, since
4888 the actual argument list is already attached to the
4890 e->value.function.esym = NULL;
4895 /* Original was variable so convert array references into
4896 an actual arglist. This does not need any checking now
4897 since gfc_resolve_function will take care of it. */
4898 e->value.function.actual = NULL;
4899 e->expr_type = EXPR_FUNCTION;
4902 /* Ambiguity will not arise if the array reference is not
4903 the last reference. */
4904 for (ref = e->ref; ref; ref = ref->next)
4905 if (ref->type == REF_ARRAY && ref->next == NULL)
4908 gcc_assert (ref->type == REF_ARRAY);
4910 /* Grab the start expressions from the array ref and
4911 copy them into actual arguments. */
4912 for (n = 0; n < ref->u.ar.dimen; n++)
4914 arg = gfc_get_actual_arglist ();
4915 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4916 if (e->value.function.actual == NULL)
4917 tail = e->value.function.actual = arg;
4925 /* Dump the reference list and set the rank. */
4926 gfc_free_ref_list (e->ref);
4928 e->rank = sym->as ? sym->as->rank : 0;
4931 gfc_resolve_expr (e);
4935 /* This might have changed! */
4936 return e->expr_type == EXPR_FUNCTION;
4941 gfc_resolve_character_operator (gfc_expr *e)
4943 gfc_expr *op1 = e->value.op.op1;
4944 gfc_expr *op2 = e->value.op.op2;
4945 gfc_expr *e1 = NULL;
4946 gfc_expr *e2 = NULL;
4948 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4950 if (op1->ts.u.cl && op1->ts.u.cl->length)
4951 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4952 else if (op1->expr_type == EXPR_CONSTANT)
4953 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4954 op1->value.character.length);
4956 if (op2->ts.u.cl && op2->ts.u.cl->length)
4957 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4958 else if (op2->expr_type == EXPR_CONSTANT)
4959 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4960 op2->value.character.length);
4962 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4967 e->ts.u.cl->length = gfc_add (e1, e2);
4968 e->ts.u.cl->length->ts.type = BT_INTEGER;
4969 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4970 gfc_simplify_expr (e->ts.u.cl->length, 0);
4971 gfc_resolve_expr (e->ts.u.cl->length);
4977 /* Ensure that an character expression has a charlen and, if possible, a
4978 length expression. */
4981 fixup_charlen (gfc_expr *e)
4983 /* The cases fall through so that changes in expression type and the need
4984 for multiple fixes are picked up. In all circumstances, a charlen should
4985 be available for the middle end to hang a backend_decl on. */
4986 switch (e->expr_type)
4989 gfc_resolve_character_operator (e);
4992 if (e->expr_type == EXPR_ARRAY)
4993 gfc_resolve_character_array_constructor (e);
4995 case EXPR_SUBSTRING:
4996 if (!e->ts.u.cl && e->ref)
4997 gfc_resolve_substring_charlen (e);
5001 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5008 /* Update an actual argument to include the passed-object for type-bound
5009 procedures at the right position. */
5011 static gfc_actual_arglist*
5012 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5015 gcc_assert (argpos > 0);
5019 gfc_actual_arglist* result;
5021 result = gfc_get_actual_arglist ();
5025 result->name = name;
5031 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5033 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5038 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5041 extract_compcall_passed_object (gfc_expr* e)
5045 gcc_assert (e->expr_type == EXPR_COMPCALL);
5047 if (e->value.compcall.base_object)
5048 po = gfc_copy_expr (e->value.compcall.base_object);
5051 po = gfc_get_expr ();
5052 po->expr_type = EXPR_VARIABLE;
5053 po->symtree = e->symtree;
5054 po->ref = gfc_copy_ref (e->ref);
5055 po->where = e->where;
5058 if (gfc_resolve_expr (po) == FAILURE)
5065 /* Update the arglist of an EXPR_COMPCALL expression to include the
5069 update_compcall_arglist (gfc_expr* e)
5072 gfc_typebound_proc* tbp;
5074 tbp = e->value.compcall.tbp;
5079 po = extract_compcall_passed_object (e);
5083 if (tbp->nopass || e->value.compcall.ignore_pass)
5089 gcc_assert (tbp->pass_arg_num > 0);
5090 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5098 /* Extract the passed object from a PPC call (a copy of it). */
5101 extract_ppc_passed_object (gfc_expr *e)
5106 po = gfc_get_expr ();
5107 po->expr_type = EXPR_VARIABLE;
5108 po->symtree = e->symtree;
5109 po->ref = gfc_copy_ref (e->ref);
5110 po->where = e->where;
5112 /* Remove PPC reference. */
5114 while ((*ref)->next)
5115 ref = &(*ref)->next;
5116 gfc_free_ref_list (*ref);
5119 if (gfc_resolve_expr (po) == FAILURE)
5126 /* Update the actual arglist of a procedure pointer component to include the
5130 update_ppc_arglist (gfc_expr* e)
5134 gfc_typebound_proc* tb;
5136 if (!gfc_is_proc_ptr_comp (e, &ppc))
5143 else if (tb->nopass)
5146 po = extract_ppc_passed_object (e);
5152 gfc_error ("Passed-object at %L must be scalar", &e->where);
5156 gcc_assert (tb->pass_arg_num > 0);
5157 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5165 /* Check that the object a TBP is called on is valid, i.e. it must not be
5166 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5169 check_typebound_baseobject (gfc_expr* e)
5173 base = extract_compcall_passed_object (e);
5177 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5179 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5181 gfc_error ("Base object for type-bound procedure call at %L is of"
5182 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5186 /* If the procedure called is NOPASS, the base object must be scalar. */
5187 if (e->value.compcall.tbp->nopass && base->rank > 0)
5189 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5190 " be scalar", &e->where);
5194 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
5197 gfc_error ("Non-scalar base object at %L currently not implemented",
5206 /* Resolve a call to a type-bound procedure, either function or subroutine,
5207 statically from the data in an EXPR_COMPCALL expression. The adapted
5208 arglist and the target-procedure symtree are returned. */
5211 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5212 gfc_actual_arglist** actual)
5214 gcc_assert (e->expr_type == EXPR_COMPCALL);
5215 gcc_assert (!e->value.compcall.tbp->is_generic);
5217 /* Update the actual arglist for PASS. */
5218 if (update_compcall_arglist (e) == FAILURE)
5221 *actual = e->value.compcall.actual;
5222 *target = e->value.compcall.tbp->u.specific;
5224 gfc_free_ref_list (e->ref);
5226 e->value.compcall.actual = NULL;
5232 /* Get the ultimate declared type from an expression. In addition,
5233 return the last class/derived type reference and the copy of the
5236 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5239 gfc_symbol *declared;
5246 *new_ref = gfc_copy_ref (e->ref);
5248 for (ref = e->ref; ref; ref = ref->next)
5250 if (ref->type != REF_COMPONENT)
5253 if (ref->u.c.component->ts.type == BT_CLASS
5254 || ref->u.c.component->ts.type == BT_DERIVED)
5256 declared = ref->u.c.component->ts.u.derived;
5262 if (declared == NULL)
5263 declared = e->symtree->n.sym->ts.u.derived;
5269 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5270 which of the specific bindings (if any) matches the arglist and transform
5271 the expression into a call of that binding. */
5274 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5276 gfc_typebound_proc* genproc;
5277 const char* genname;
5279 gfc_symbol *derived;
5281 gcc_assert (e->expr_type == EXPR_COMPCALL);
5282 genname = e->value.compcall.name;
5283 genproc = e->value.compcall.tbp;
5285 if (!genproc->is_generic)
5288 /* Try the bindings on this type and in the inheritance hierarchy. */
5289 for (; genproc; genproc = genproc->overridden)
5293 gcc_assert (genproc->is_generic);
5294 for (g = genproc->u.generic; g; g = g->next)
5297 gfc_actual_arglist* args;
5300 gcc_assert (g->specific);
5302 if (g->specific->error)
5305 target = g->specific->u.specific->n.sym;
5307 /* Get the right arglist by handling PASS/NOPASS. */
5308 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5309 if (!g->specific->nopass)
5312 po = extract_compcall_passed_object (e);
5316 gcc_assert (g->specific->pass_arg_num > 0);
5317 gcc_assert (!g->specific->error);
5318 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5319 g->specific->pass_arg);
5321 resolve_actual_arglist (args, target->attr.proc,
5322 is_external_proc (target) && !target->formal);
5324 /* Check if this arglist matches the formal. */
5325 matches = gfc_arglist_matches_symbol (&args, target);
5327 /* Clean up and break out of the loop if we've found it. */
5328 gfc_free_actual_arglist (args);
5331 e->value.compcall.tbp = g->specific;
5332 /* Pass along the name for CLASS methods, where the vtab
5333 procedure pointer component has to be referenced. */
5335 *name = g->specific_st->name;
5341 /* Nothing matching found! */
5342 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5343 " '%s' at %L", genname, &e->where);
5347 /* Make sure that we have the right specific instance for the name. */
5348 genname = e->value.compcall.tbp->u.specific->name;
5350 /* Is the symtree name a "unique name". */
5351 if (*genname == '@')
5352 genname = e->value.compcall.tbp->u.specific->n.sym->name;
5354 derived = get_declared_from_expr (NULL, NULL, e);
5356 st = gfc_find_typebound_proc (derived, NULL, genname, false, &e->where);
5358 e->value.compcall.tbp = st->n.tb;
5364 /* Resolve a call to a type-bound subroutine. */
5367 resolve_typebound_call (gfc_code* c, const char **name)
5369 gfc_actual_arglist* newactual;
5370 gfc_symtree* target;
5372 /* Check that's really a SUBROUTINE. */
5373 if (!c->expr1->value.compcall.tbp->subroutine)
5375 gfc_error ("'%s' at %L should be a SUBROUTINE",
5376 c->expr1->value.compcall.name, &c->loc);
5380 if (check_typebound_baseobject (c->expr1) == FAILURE)
5383 /* Pass along the name for CLASS methods, where the vtab
5384 procedure pointer component has to be referenced. */
5386 *name = c->expr1->value.compcall.name;
5388 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5391 /* Transform into an ordinary EXEC_CALL for now. */
5393 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5396 c->ext.actual = newactual;
5397 c->symtree = target;
5398 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5400 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5402 gfc_free_expr (c->expr1);
5403 c->expr1 = gfc_get_expr ();
5404 c->expr1->expr_type = EXPR_FUNCTION;
5405 c->expr1->symtree = target;
5406 c->expr1->where = c->loc;
5408 return resolve_call (c);
5412 /* Resolve a component-call expression. */
5414 resolve_compcall (gfc_expr* e, const char **name)
5416 gfc_actual_arglist* newactual;
5417 gfc_symtree* target;
5419 /* Check that's really a FUNCTION. */
5420 if (!e->value.compcall.tbp->function)
5422 gfc_error ("'%s' at %L should be a FUNCTION",
5423 e->value.compcall.name, &e->where);
5427 /* These must not be assign-calls! */
5428 gcc_assert (!e->value.compcall.assign);
5430 if (check_typebound_baseobject (e) == FAILURE)
5433 /* Pass along the name for CLASS methods, where the vtab
5434 procedure pointer component has to be referenced. */
5436 *name = e->value.compcall.name;
5438 if (resolve_typebound_generic_call (e, name) == FAILURE)
5440 gcc_assert (!e->value.compcall.tbp->is_generic);
5442 /* Take the rank from the function's symbol. */
5443 if (e->value.compcall.tbp->u.specific->n.sym->as)
5444 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5446 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5447 arglist to the TBP's binding target. */
5449 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5452 e->value.function.actual = newactual;
5453 e->value.function.name = NULL;
5454 e->value.function.esym = target->n.sym;
5455 e->value.function.isym = NULL;
5456 e->symtree = target;
5457 e->ts = target->n.sym->ts;
5458 e->expr_type = EXPR_FUNCTION;
5460 /* Resolution is not necessary if this is a class subroutine; this
5461 function only has to identify the specific proc. Resolution of
5462 the call will be done next in resolve_typebound_call. */
5463 return gfc_resolve_expr (e);
5468 /* Resolve a typebound function, or 'method'. First separate all
5469 the non-CLASS references by calling resolve_compcall directly. */
5472 resolve_typebound_function (gfc_expr* e)
5474 gfc_symbol *declared;
5480 const char *genname;
5485 return resolve_compcall (e, NULL);
5487 if (resolve_ref (e) == FAILURE)
5490 /* Get the CLASS declared type. */
5491 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5493 /* Weed out cases of the ultimate component being a derived type. */
5494 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5495 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5497 gfc_free_ref_list (new_ref);
5498 return resolve_compcall (e, NULL);
5501 c = gfc_find_component (declared, "$data", true, true);
5502 declared = c->ts.u.derived;
5504 /* Keep the generic name so that the vtab reference can be made. */
5506 if (e->value.compcall.tbp->is_generic)
5507 genname = e->value.compcall.name;
5509 /* Treat the call as if it is a typebound procedure, in order to roll
5510 out the correct name for the specific function. */
5511 if (resolve_compcall (e, &name) == FAILURE)
5515 /* Then convert the expression to a procedure pointer component call. */
5516 e->value.function.esym = NULL;
5522 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5523 gfc_add_component_ref (e, "$vptr");
5526 /* A generic procedure needs the subsidiary vtabs and vtypes for
5527 the specific procedures to have been build. */
5529 vtab = gfc_find_derived_vtab (declared, true);
5531 gfc_add_component_ref (e, genname);
5533 gfc_add_component_ref (e, name);
5535 /* Recover the typespec for the expression. This is really only
5536 necessary for generic procedures, where the additional call
5537 to gfc_add_component_ref seems to throw the collection of the
5538 correct typespec. */
5543 /* Resolve a typebound subroutine, or 'method'. First separate all
5544 the non-CLASS references by calling resolve_typebound_call
5548 resolve_typebound_subroutine (gfc_code *code)
5550 gfc_symbol *declared;
5555 const char *genname;
5559 st = code->expr1->symtree;
5561 return resolve_typebound_call (code, NULL);
5563 if (resolve_ref (code->expr1) == FAILURE)
5566 /* Get the CLASS declared type. */
5567 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5569 /* Weed out cases of the ultimate component being a derived type. */
5570 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5571 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5573 gfc_free_ref_list (new_ref);
5574 return resolve_typebound_call (code, NULL);
5577 c = gfc_find_component (declared, "$data", true, true);
5578 declared = c->ts.u.derived;
5580 /* Keep the generic name so that the vtab reference can be made. */
5582 if (code->expr1->value.compcall.tbp->is_generic)
5583 genname = code->expr1->value.compcall.name;
5585 if (resolve_typebound_call (code, &name) == FAILURE)
5587 ts = code->expr1->ts;
5589 /* Then convert the expression to a procedure pointer component call. */
5590 code->expr1->value.function.esym = NULL;
5591 code->expr1->symtree = st;
5594 code->expr1->ref = new_ref;
5596 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5597 gfc_add_component_ref (code->expr1, "$vptr");
5600 /* A generic procedure needs the subsidiary vtabs and vtypes for
5601 the specific procedures to have been build. */
5603 vtab = gfc_find_derived_vtab (declared, true);
5605 gfc_add_component_ref (code->expr1, genname);
5607 gfc_add_component_ref (code->expr1, name);
5609 /* Recover the typespec for the expression. This is really only
5610 necessary for generic procedures, where the additional call
5611 to gfc_add_component_ref seems to throw the collection of the
5612 correct typespec. */
5613 code->expr1->ts = ts;
5618 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5621 resolve_ppc_call (gfc_code* c)
5623 gfc_component *comp;
5626 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5629 c->resolved_sym = c->expr1->symtree->n.sym;
5630 c->expr1->expr_type = EXPR_VARIABLE;
5632 if (!comp->attr.subroutine)
5633 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5635 if (resolve_ref (c->expr1) == FAILURE)
5638 if (update_ppc_arglist (c->expr1) == FAILURE)
5641 c->ext.actual = c->expr1->value.compcall.actual;
5643 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5644 comp->formal == NULL) == FAILURE)
5647 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5653 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5656 resolve_expr_ppc (gfc_expr* e)
5658 gfc_component *comp;
5661 b = gfc_is_proc_ptr_comp (e, &comp);
5664 /* Convert to EXPR_FUNCTION. */
5665 e->expr_type = EXPR_FUNCTION;
5666 e->value.function.isym = NULL;
5667 e->value.function.actual = e->value.compcall.actual;
5669 if (comp->as != NULL)
5670 e->rank = comp->as->rank;
5672 if (!comp->attr.function)
5673 gfc_add_function (&comp->attr, comp->name, &e->where);
5675 if (resolve_ref (e) == FAILURE)
5678 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5679 comp->formal == NULL) == FAILURE)
5682 if (update_ppc_arglist (e) == FAILURE)
5685 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5692 gfc_is_expandable_expr (gfc_expr *e)
5694 gfc_constructor *con;
5696 if (e->expr_type == EXPR_ARRAY)
5698 /* Traverse the constructor looking for variables that are flavor
5699 parameter. Parameters must be expanded since they are fully used at
5701 con = gfc_constructor_first (e->value.constructor);
5702 for (; con; con = gfc_constructor_next (con))
5704 if (con->expr->expr_type == EXPR_VARIABLE
5705 && con->expr->symtree
5706 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5707 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5709 if (con->expr->expr_type == EXPR_ARRAY
5710 && gfc_is_expandable_expr (con->expr))
5718 /* Resolve an expression. That is, make sure that types of operands agree
5719 with their operators, intrinsic operators are converted to function calls
5720 for overloaded types and unresolved function references are resolved. */
5723 gfc_resolve_expr (gfc_expr *e)
5731 /* inquiry_argument only applies to variables. */
5732 inquiry_save = inquiry_argument;
5733 if (e->expr_type != EXPR_VARIABLE)
5734 inquiry_argument = false;
5736 switch (e->expr_type)
5739 t = resolve_operator (e);
5745 if (check_host_association (e))
5746 t = resolve_function (e);
5749 t = resolve_variable (e);
5751 expression_rank (e);
5754 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5755 && e->ref->type != REF_SUBSTRING)
5756 gfc_resolve_substring_charlen (e);
5761 t = resolve_typebound_function (e);
5764 case EXPR_SUBSTRING:
5765 t = resolve_ref (e);
5774 t = resolve_expr_ppc (e);
5779 if (resolve_ref (e) == FAILURE)
5782 t = gfc_resolve_array_constructor (e);
5783 /* Also try to expand a constructor. */
5786 expression_rank (e);
5787 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5788 gfc_expand_constructor (e, false);
5791 /* This provides the opportunity for the length of constructors with
5792 character valued function elements to propagate the string length
5793 to the expression. */
5794 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5796 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5797 here rather then add a duplicate test for it above. */
5798 gfc_expand_constructor (e, false);
5799 t = gfc_resolve_character_array_constructor (e);
5804 case EXPR_STRUCTURE:
5805 t = resolve_ref (e);
5809 t = resolve_structure_cons (e);
5813 t = gfc_simplify_expr (e, 0);
5817 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5820 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5823 inquiry_argument = inquiry_save;
5829 /* Resolve an expression from an iterator. They must be scalar and have
5830 INTEGER or (optionally) REAL type. */
5833 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5834 const char *name_msgid)
5836 if (gfc_resolve_expr (expr) == FAILURE)
5839 if (expr->rank != 0)
5841 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5845 if (expr->ts.type != BT_INTEGER)
5847 if (expr->ts.type == BT_REAL)
5850 return gfc_notify_std (GFC_STD_F95_DEL,
5851 "Deleted feature: %s at %L must be integer",
5852 _(name_msgid), &expr->where);
5855 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5862 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5870 /* Resolve the expressions in an iterator structure. If REAL_OK is
5871 false allow only INTEGER type iterators, otherwise allow REAL types. */
5874 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5876 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5880 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5882 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5887 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5888 "Start expression in DO loop") == FAILURE)
5891 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5892 "End expression in DO loop") == FAILURE)
5895 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5896 "Step expression in DO loop") == FAILURE)
5899 if (iter->step->expr_type == EXPR_CONSTANT)
5901 if ((iter->step->ts.type == BT_INTEGER
5902 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5903 || (iter->step->ts.type == BT_REAL
5904 && mpfr_sgn (iter->step->value.real) == 0))
5906 gfc_error ("Step expression in DO loop at %L cannot be zero",
5907 &iter->step->where);
5912 /* Convert start, end, and step to the same type as var. */
5913 if (iter->start->ts.kind != iter->var->ts.kind
5914 || iter->start->ts.type != iter->var->ts.type)
5915 gfc_convert_type (iter->start, &iter->var->ts, 2);
5917 if (iter->end->ts.kind != iter->var->ts.kind
5918 || iter->end->ts.type != iter->var->ts.type)
5919 gfc_convert_type (iter->end, &iter->var->ts, 2);
5921 if (iter->step->ts.kind != iter->var->ts.kind
5922 || iter->step->ts.type != iter->var->ts.type)
5923 gfc_convert_type (iter->step, &iter->var->ts, 2);
5925 if (iter->start->expr_type == EXPR_CONSTANT
5926 && iter->end->expr_type == EXPR_CONSTANT
5927 && iter->step->expr_type == EXPR_CONSTANT)
5930 if (iter->start->ts.type == BT_INTEGER)
5932 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5933 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5937 sgn = mpfr_sgn (iter->step->value.real);
5938 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5940 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5941 gfc_warning ("DO loop at %L will be executed zero times",
5942 &iter->step->where);
5949 /* Traversal function for find_forall_index. f == 2 signals that
5950 that variable itself is not to be checked - only the references. */
5953 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5955 if (expr->expr_type != EXPR_VARIABLE)
5958 /* A scalar assignment */
5959 if (!expr->ref || *f == 1)
5961 if (expr->symtree->n.sym == sym)
5973 /* Check whether the FORALL index appears in the expression or not.
5974 Returns SUCCESS if SYM is found in EXPR. */
5977 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5979 if (gfc_traverse_expr (expr, sym, forall_index, f))
5986 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5987 to be a scalar INTEGER variable. The subscripts and stride are scalar
5988 INTEGERs, and if stride is a constant it must be nonzero.
5989 Furthermore "A subscript or stride in a forall-triplet-spec shall
5990 not contain a reference to any index-name in the
5991 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5994 resolve_forall_iterators (gfc_forall_iterator *it)
5996 gfc_forall_iterator *iter, *iter2;
5998 for (iter = it; iter; iter = iter->next)
6000 if (gfc_resolve_expr (iter->var) == SUCCESS
6001 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6002 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6005 if (gfc_resolve_expr (iter->start) == SUCCESS
6006 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6007 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6008 &iter->start->where);
6009 if (iter->var->ts.kind != iter->start->ts.kind)
6010 gfc_convert_type (iter->start, &iter->var->ts, 2);
6012 if (gfc_resolve_expr (iter->end) == SUCCESS
6013 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6014 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6016 if (iter->var->ts.kind != iter->end->ts.kind)
6017 gfc_convert_type (iter->end, &iter->var->ts, 2);
6019 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6021 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6022 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6023 &iter->stride->where, "INTEGER");
6025 if (iter->stride->expr_type == EXPR_CONSTANT
6026 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6027 gfc_error ("FORALL stride expression at %L cannot be zero",
6028 &iter->stride->where);
6030 if (iter->var->ts.kind != iter->stride->ts.kind)
6031 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6034 for (iter = it; iter; iter = iter->next)
6035 for (iter2 = iter; iter2; iter2 = iter2->next)
6037 if (find_forall_index (iter2->start,
6038 iter->var->symtree->n.sym, 0) == SUCCESS
6039 || find_forall_index (iter2->end,
6040 iter->var->symtree->n.sym, 0) == SUCCESS
6041 || find_forall_index (iter2->stride,
6042 iter->var->symtree->n.sym, 0) == SUCCESS)
6043 gfc_error ("FORALL index '%s' may not appear in triplet "
6044 "specification at %L", iter->var->symtree->name,
6045 &iter2->start->where);
6050 /* Given a pointer to a symbol that is a derived type, see if it's
6051 inaccessible, i.e. if it's defined in another module and the components are
6052 PRIVATE. The search is recursive if necessary. Returns zero if no
6053 inaccessible components are found, nonzero otherwise. */
6056 derived_inaccessible (gfc_symbol *sym)
6060 if (sym->attr.use_assoc && sym->attr.private_comp)
6063 for (c = sym->components; c; c = c->next)
6065 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6073 /* Resolve the argument of a deallocate expression. The expression must be
6074 a pointer or a full array. */
6077 resolve_deallocate_expr (gfc_expr *e)
6079 symbol_attribute attr;
6080 int allocatable, pointer, check_intent_in;
6085 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6086 check_intent_in = 1;
6088 if (gfc_resolve_expr (e) == FAILURE)
6091 if (e->expr_type != EXPR_VARIABLE)
6094 sym = e->symtree->n.sym;
6096 if (sym->ts.type == BT_CLASS)
6098 allocatable = CLASS_DATA (sym)->attr.allocatable;
6099 pointer = CLASS_DATA (sym)->attr.pointer;
6103 allocatable = sym->attr.allocatable;
6104 pointer = sym->attr.pointer;
6106 for (ref = e->ref; ref; ref = ref->next)
6109 check_intent_in = 0;
6114 if (ref->u.ar.type != AR_FULL)
6119 c = ref->u.c.component;
6120 if (c->ts.type == BT_CLASS)
6122 allocatable = CLASS_DATA (c)->attr.allocatable;
6123 pointer = CLASS_DATA (c)->attr.pointer;
6127 allocatable = c->attr.allocatable;
6128 pointer = c->attr.pointer;
6138 attr = gfc_expr_attr (e);
6140 if (allocatable == 0 && attr.pointer == 0)
6143 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6148 if (check_intent_in && sym->attr.intent == INTENT_IN)
6150 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
6151 sym->name, &e->where);
6155 if (e->ts.type == BT_CLASS)
6157 /* Only deallocate the DATA component. */
6158 gfc_add_component_ref (e, "$data");
6165 /* Returns true if the expression e contains a reference to the symbol sym. */
6167 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6169 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6176 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6178 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6182 /* Given the expression node e for an allocatable/pointer of derived type to be
6183 allocated, get the expression node to be initialized afterwards (needed for
6184 derived types with default initializers, and derived types with allocatable
6185 components that need nullification.) */
6188 gfc_expr_to_initialize (gfc_expr *e)
6194 result = gfc_copy_expr (e);
6196 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6197 for (ref = result->ref; ref; ref = ref->next)
6198 if (ref->type == REF_ARRAY && ref->next == NULL)
6200 ref->u.ar.type = AR_FULL;
6202 for (i = 0; i < ref->u.ar.dimen; i++)
6203 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6205 result->rank = ref->u.ar.dimen;
6213 /* Used in resolve_allocate_expr to check that a allocation-object and
6214 a source-expr are conformable. This does not catch all possible
6215 cases; in particular a runtime checking is needed. */
6218 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6221 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6223 /* First compare rank. */
6224 if (tail && e1->rank != tail->u.ar.as->rank)
6226 gfc_error ("Source-expr at %L must be scalar or have the "
6227 "same rank as the allocate-object at %L",
6228 &e1->where, &e2->where);
6239 for (i = 0; i < e1->rank; i++)
6241 if (tail->u.ar.end[i])
6243 mpz_set (s, tail->u.ar.end[i]->value.integer);
6244 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6245 mpz_add_ui (s, s, 1);
6249 mpz_set (s, tail->u.ar.start[i]->value.integer);
6252 if (mpz_cmp (e1->shape[i], s) != 0)
6254 gfc_error ("Source-expr at %L and allocate-object at %L must "
6255 "have the same shape", &e1->where, &e2->where);
6268 /* Resolve the expression in an ALLOCATE statement, doing the additional
6269 checks to see whether the expression is OK or not. The expression must
6270 have a trailing array reference that gives the size of the array. */
6273 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6275 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6277 symbol_attribute attr;
6278 gfc_ref *ref, *ref2;
6280 gfc_symbol *sym = NULL;
6284 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6285 check_intent_in = 1;
6287 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6288 checking of coarrays. */
6289 for (ref = e->ref; ref; ref = ref->next)
6290 if (ref->next == NULL)
6293 if (ref && ref->type == REF_ARRAY)
6294 ref->u.ar.in_allocate = true;
6296 if (gfc_resolve_expr (e) == FAILURE)
6299 /* Make sure the expression is allocatable or a pointer. If it is
6300 pointer, the next-to-last reference must be a pointer. */
6304 sym = e->symtree->n.sym;
6306 /* Check whether ultimate component is abstract and CLASS. */
6309 if (e->expr_type != EXPR_VARIABLE)
6312 attr = gfc_expr_attr (e);
6313 pointer = attr.pointer;
6314 dimension = attr.dimension;
6315 codimension = attr.codimension;
6319 if (sym->ts.type == BT_CLASS)
6321 allocatable = CLASS_DATA (sym)->attr.allocatable;
6322 pointer = CLASS_DATA (sym)->attr.pointer;
6323 dimension = CLASS_DATA (sym)->attr.dimension;
6324 codimension = CLASS_DATA (sym)->attr.codimension;
6325 is_abstract = CLASS_DATA (sym)->attr.abstract;
6329 allocatable = sym->attr.allocatable;
6330 pointer = sym->attr.pointer;
6331 dimension = sym->attr.dimension;
6332 codimension = sym->attr.codimension;
6335 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6338 check_intent_in = 0;
6343 if (ref->next != NULL)
6349 if (gfc_is_coindexed (e))
6351 gfc_error ("Coindexed allocatable object at %L",
6356 c = ref->u.c.component;
6357 if (c->ts.type == BT_CLASS)
6359 allocatable = CLASS_DATA (c)->attr.allocatable;
6360 pointer = CLASS_DATA (c)->attr.pointer;
6361 dimension = CLASS_DATA (c)->attr.dimension;
6362 codimension = CLASS_DATA (c)->attr.codimension;
6363 is_abstract = CLASS_DATA (c)->attr.abstract;
6367 allocatable = c->attr.allocatable;
6368 pointer = c->attr.pointer;
6369 dimension = c->attr.dimension;
6370 codimension = c->attr.codimension;
6371 is_abstract = c->attr.abstract;
6383 if (allocatable == 0 && pointer == 0)
6385 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6390 /* Some checks for the SOURCE tag. */
6393 /* Check F03:C631. */
6394 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6396 gfc_error ("Type of entity at %L is type incompatible with "
6397 "source-expr at %L", &e->where, &code->expr3->where);
6401 /* Check F03:C632 and restriction following Note 6.18. */
6402 if (code->expr3->rank > 0
6403 && conformable_arrays (code->expr3, e) == FAILURE)
6406 /* Check F03:C633. */
6407 if (code->expr3->ts.kind != e->ts.kind)
6409 gfc_error ("The allocate-object at %L and the source-expr at %L "
6410 "shall have the same kind type parameter",
6411 &e->where, &code->expr3->where);
6416 /* Check F08:C629. */
6417 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6420 gcc_assert (e->ts.type == BT_CLASS);
6421 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6422 "type-spec or source-expr", sym->name, &e->where);
6426 if (check_intent_in && sym->attr.intent == INTENT_IN)
6428 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6429 sym->name, &e->where);
6433 if (!code->expr3 || code->expr3->mold)
6435 /* Add default initializer for those derived types that need them. */
6436 gfc_expr *init_e = NULL;
6439 if (code->ext.alloc.ts.type == BT_DERIVED)
6440 ts = code->ext.alloc.ts;
6441 else if (code->expr3)
6442 ts = code->expr3->ts;
6446 if (ts.type == BT_DERIVED)
6447 init_e = gfc_default_initializer (&ts);
6448 /* FIXME: Use default init of dynamic type (cf. PR 44541). */
6449 else if (e->ts.type == BT_CLASS)
6450 init_e = gfc_default_initializer (&ts.u.derived->components->ts);
6454 gfc_code *init_st = gfc_get_code ();
6455 init_st->loc = code->loc;
6456 init_st->op = EXEC_INIT_ASSIGN;
6457 init_st->expr1 = gfc_expr_to_initialize (e);
6458 init_st->expr2 = init_e;
6459 init_st->next = code->next;
6460 code->next = init_st;
6464 if (pointer || (dimension == 0 && codimension == 0))
6467 /* Make sure the next-to-last reference node is an array specification. */
6469 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6470 || (dimension && ref2->u.ar.dimen == 0))
6472 gfc_error ("Array specification required in ALLOCATE statement "
6473 "at %L", &e->where);
6477 /* Make sure that the array section reference makes sense in the
6478 context of an ALLOCATE specification. */
6482 if (codimension && ar->codimen == 0)
6484 gfc_error ("Coarray specification required in ALLOCATE statement "
6485 "at %L", &e->where);
6489 for (i = 0; i < ar->dimen; i++)
6491 if (ref2->u.ar.type == AR_ELEMENT)
6494 switch (ar->dimen_type[i])
6500 if (ar->start[i] != NULL
6501 && ar->end[i] != NULL
6502 && ar->stride[i] == NULL)
6505 /* Fall Through... */
6510 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6516 for (a = code->ext.alloc.list; a; a = a->next)
6518 sym = a->expr->symtree->n.sym;
6520 /* TODO - check derived type components. */
6521 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6524 if ((ar->start[i] != NULL
6525 && gfc_find_sym_in_expr (sym, ar->start[i]))
6526 || (ar->end[i] != NULL
6527 && gfc_find_sym_in_expr (sym, ar->end[i])))
6529 gfc_error ("'%s' must not appear in the array specification at "
6530 "%L in the same ALLOCATE statement where it is "
6531 "itself allocated", sym->name, &ar->where);
6537 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6539 if (ar->dimen_type[i] == DIMEN_ELEMENT
6540 || ar->dimen_type[i] == DIMEN_RANGE)
6542 if (i == (ar->dimen + ar->codimen - 1))
6544 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6545 "statement at %L", &e->where);
6551 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6552 && ar->stride[i] == NULL)
6555 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6560 if (codimension && ar->as->rank == 0)
6562 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6563 "at %L", &e->where);
6575 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6577 gfc_expr *stat, *errmsg, *pe, *qe;
6578 gfc_alloc *a, *p, *q;
6580 stat = code->expr1 ? code->expr1 : NULL;
6582 errmsg = code->expr2 ? code->expr2 : NULL;
6584 /* Check the stat variable. */
6587 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6588 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6589 stat->symtree->n.sym->name, &stat->where);
6591 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6592 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6595 if ((stat->ts.type != BT_INTEGER
6596 && !(stat->ref && (stat->ref->type == REF_ARRAY
6597 || stat->ref->type == REF_COMPONENT)))
6599 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6600 "variable", &stat->where);
6602 for (p = code->ext.alloc.list; p; p = p->next)
6603 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6605 gfc_ref *ref1, *ref2;
6608 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
6609 ref1 = ref1->next, ref2 = ref2->next)
6611 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6613 if (ref1->u.c.component->name != ref2->u.c.component->name)
6622 gfc_error ("Stat-variable at %L shall not be %sd within "
6623 "the same %s statement", &stat->where, fcn, fcn);
6629 /* Check the errmsg variable. */
6633 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6636 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6637 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6638 errmsg->symtree->n.sym->name, &errmsg->where);
6640 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6641 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6644 if ((errmsg->ts.type != BT_CHARACTER
6646 && (errmsg->ref->type == REF_ARRAY
6647 || errmsg->ref->type == REF_COMPONENT)))
6648 || errmsg->rank > 0 )
6649 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6650 "variable", &errmsg->where);
6652 for (p = code->ext.alloc.list; p; p = p->next)
6653 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6655 gfc_ref *ref1, *ref2;
6658 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
6659 ref1 = ref1->next, ref2 = ref2->next)
6661 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6663 if (ref1->u.c.component->name != ref2->u.c.component->name)
6672 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6673 "the same %s statement", &errmsg->where, fcn, fcn);
6679 /* Check that an allocate-object appears only once in the statement.
6680 FIXME: Checking derived types is disabled. */
6681 for (p = code->ext.alloc.list; p; p = p->next)
6684 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6685 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6687 for (q = p->next; q; q = q->next)
6690 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6691 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6692 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6693 gfc_error ("Allocate-object at %L also appears at %L",
6694 &pe->where, &qe->where);
6699 if (strcmp (fcn, "ALLOCATE") == 0)
6701 for (a = code->ext.alloc.list; a; a = a->next)
6702 resolve_allocate_expr (a->expr, code);
6706 for (a = code->ext.alloc.list; a; a = a->next)
6707 resolve_deallocate_expr (a->expr);
6712 /************ SELECT CASE resolution subroutines ************/
6714 /* Callback function for our mergesort variant. Determines interval
6715 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6716 op1 > op2. Assumes we're not dealing with the default case.
6717 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6718 There are nine situations to check. */
6721 compare_cases (const gfc_case *op1, const gfc_case *op2)
6725 if (op1->low == NULL) /* op1 = (:L) */
6727 /* op2 = (:N), so overlap. */
6729 /* op2 = (M:) or (M:N), L < M */
6730 if (op2->low != NULL
6731 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6734 else if (op1->high == NULL) /* op1 = (K:) */
6736 /* op2 = (M:), so overlap. */
6738 /* op2 = (:N) or (M:N), K > N */
6739 if (op2->high != NULL
6740 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6743 else /* op1 = (K:L) */
6745 if (op2->low == NULL) /* op2 = (:N), K > N */
6746 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6748 else if (op2->high == NULL) /* op2 = (M:), L < M */
6749 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6751 else /* op2 = (M:N) */
6755 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6758 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6767 /* Merge-sort a double linked case list, detecting overlap in the
6768 process. LIST is the head of the double linked case list before it
6769 is sorted. Returns the head of the sorted list if we don't see any
6770 overlap, or NULL otherwise. */
6773 check_case_overlap (gfc_case *list)
6775 gfc_case *p, *q, *e, *tail;
6776 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6778 /* If the passed list was empty, return immediately. */
6785 /* Loop unconditionally. The only exit from this loop is a return
6786 statement, when we've finished sorting the case list. */
6793 /* Count the number of merges we do in this pass. */
6796 /* Loop while there exists a merge to be done. */
6801 /* Count this merge. */
6804 /* Cut the list in two pieces by stepping INSIZE places
6805 forward in the list, starting from P. */
6808 for (i = 0; i < insize; i++)
6817 /* Now we have two lists. Merge them! */
6818 while (psize > 0 || (qsize > 0 && q != NULL))
6820 /* See from which the next case to merge comes from. */
6823 /* P is empty so the next case must come from Q. */
6828 else if (qsize == 0 || q == NULL)
6837 cmp = compare_cases (p, q);
6840 /* The whole case range for P is less than the
6848 /* The whole case range for Q is greater than
6849 the case range for P. */
6856 /* The cases overlap, or they are the same
6857 element in the list. Either way, we must
6858 issue an error and get the next case from P. */
6859 /* FIXME: Sort P and Q by line number. */
6860 gfc_error ("CASE label at %L overlaps with CASE "
6861 "label at %L", &p->where, &q->where);
6869 /* Add the next element to the merged list. */
6878 /* P has now stepped INSIZE places along, and so has Q. So
6879 they're the same. */
6884 /* If we have done only one merge or none at all, we've
6885 finished sorting the cases. */
6894 /* Otherwise repeat, merging lists twice the size. */
6900 /* Check to see if an expression is suitable for use in a CASE statement.
6901 Makes sure that all case expressions are scalar constants of the same
6902 type. Return FAILURE if anything is wrong. */
6905 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6907 if (e == NULL) return SUCCESS;
6909 if (e->ts.type != case_expr->ts.type)
6911 gfc_error ("Expression in CASE statement at %L must be of type %s",
6912 &e->where, gfc_basic_typename (case_expr->ts.type));
6916 /* C805 (R808) For a given case-construct, each case-value shall be of
6917 the same type as case-expr. For character type, length differences
6918 are allowed, but the kind type parameters shall be the same. */
6920 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6922 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6923 &e->where, case_expr->ts.kind);
6927 /* Convert the case value kind to that of case expression kind,
6930 if (e->ts.kind != case_expr->ts.kind)
6931 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6935 gfc_error ("Expression in CASE statement at %L must be scalar",
6944 /* Given a completely parsed select statement, we:
6946 - Validate all expressions and code within the SELECT.
6947 - Make sure that the selection expression is not of the wrong type.
6948 - Make sure that no case ranges overlap.
6949 - Eliminate unreachable cases and unreachable code resulting from
6950 removing case labels.
6952 The standard does allow unreachable cases, e.g. CASE (5:3). But
6953 they are a hassle for code generation, and to prevent that, we just
6954 cut them out here. This is not necessary for overlapping cases
6955 because they are illegal and we never even try to generate code.
6957 We have the additional caveat that a SELECT construct could have
6958 been a computed GOTO in the source code. Fortunately we can fairly
6959 easily work around that here: The case_expr for a "real" SELECT CASE
6960 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6961 we have to do is make sure that the case_expr is a scalar integer
6965 resolve_select (gfc_code *code)
6968 gfc_expr *case_expr;
6969 gfc_case *cp, *default_case, *tail, *head;
6970 int seen_unreachable;
6976 if (code->expr1 == NULL)
6978 /* This was actually a computed GOTO statement. */
6979 case_expr = code->expr2;
6980 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6981 gfc_error ("Selection expression in computed GOTO statement "
6982 "at %L must be a scalar integer expression",
6985 /* Further checking is not necessary because this SELECT was built
6986 by the compiler, so it should always be OK. Just move the
6987 case_expr from expr2 to expr so that we can handle computed
6988 GOTOs as normal SELECTs from here on. */
6989 code->expr1 = code->expr2;
6994 case_expr = code->expr1;
6996 type = case_expr->ts.type;
6997 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6999 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7000 &case_expr->where, gfc_typename (&case_expr->ts));
7002 /* Punt. Going on here just produce more garbage error messages. */
7006 if (case_expr->rank != 0)
7008 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7009 "expression", &case_expr->where);
7016 /* Raise a warning if an INTEGER case value exceeds the range of
7017 the case-expr. Later, all expressions will be promoted to the
7018 largest kind of all case-labels. */
7020 if (type == BT_INTEGER)
7021 for (body = code->block; body; body = body->block)
7022 for (cp = body->ext.case_list; cp; cp = cp->next)
7025 && gfc_check_integer_range (cp->low->value.integer,
7026 case_expr->ts.kind) != ARITH_OK)
7027 gfc_warning ("Expression in CASE statement at %L is "
7028 "not in the range of %s", &cp->low->where,
7029 gfc_typename (&case_expr->ts));
7032 && cp->low != cp->high
7033 && gfc_check_integer_range (cp->high->value.integer,
7034 case_expr->ts.kind) != ARITH_OK)
7035 gfc_warning ("Expression in CASE statement at %L is "
7036 "not in the range of %s", &cp->high->where,
7037 gfc_typename (&case_expr->ts));
7040 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7041 of the SELECT CASE expression and its CASE values. Walk the lists
7042 of case values, and if we find a mismatch, promote case_expr to
7043 the appropriate kind. */
7045 if (type == BT_LOGICAL || type == BT_INTEGER)
7047 for (body = code->block; body; body = body->block)
7049 /* Walk the case label list. */
7050 for (cp = body->ext.case_list; cp; cp = cp->next)
7052 /* Intercept the DEFAULT case. It does not have a kind. */
7053 if (cp->low == NULL && cp->high == NULL)
7056 /* Unreachable case ranges are discarded, so ignore. */
7057 if (cp->low != NULL && cp->high != NULL
7058 && cp->low != cp->high
7059 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7063 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7064 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7066 if (cp->high != NULL
7067 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7068 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7073 /* Assume there is no DEFAULT case. */
7074 default_case = NULL;
7079 for (body = code->block; body; body = body->block)
7081 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7083 seen_unreachable = 0;
7085 /* Walk the case label list, making sure that all case labels
7087 for (cp = body->ext.case_list; cp; cp = cp->next)
7089 /* Count the number of cases in the whole construct. */
7092 /* Intercept the DEFAULT case. */
7093 if (cp->low == NULL && cp->high == NULL)
7095 if (default_case != NULL)
7097 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7098 "by a second DEFAULT CASE at %L",
7099 &default_case->where, &cp->where);
7110 /* Deal with single value cases and case ranges. Errors are
7111 issued from the validation function. */
7112 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7113 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7119 if (type == BT_LOGICAL
7120 && ((cp->low == NULL || cp->high == NULL)
7121 || cp->low != cp->high))
7123 gfc_error ("Logical range in CASE statement at %L is not "
7124 "allowed", &cp->low->where);
7129 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7132 value = cp->low->value.logical == 0 ? 2 : 1;
7133 if (value & seen_logical)
7135 gfc_error ("Constant logical value in CASE statement "
7136 "is repeated at %L",
7141 seen_logical |= value;
7144 if (cp->low != NULL && cp->high != NULL
7145 && cp->low != cp->high
7146 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7148 if (gfc_option.warn_surprising)
7149 gfc_warning ("Range specification at %L can never "
7150 "be matched", &cp->where);
7152 cp->unreachable = 1;
7153 seen_unreachable = 1;
7157 /* If the case range can be matched, it can also overlap with
7158 other cases. To make sure it does not, we put it in a
7159 double linked list here. We sort that with a merge sort
7160 later on to detect any overlapping cases. */
7164 head->right = head->left = NULL;
7169 tail->right->left = tail;
7176 /* It there was a failure in the previous case label, give up
7177 for this case label list. Continue with the next block. */
7181 /* See if any case labels that are unreachable have been seen.
7182 If so, we eliminate them. This is a bit of a kludge because
7183 the case lists for a single case statement (label) is a
7184 single forward linked lists. */
7185 if (seen_unreachable)
7187 /* Advance until the first case in the list is reachable. */
7188 while (body->ext.case_list != NULL
7189 && body->ext.case_list->unreachable)
7191 gfc_case *n = body->ext.case_list;
7192 body->ext.case_list = body->ext.case_list->next;
7194 gfc_free_case_list (n);
7197 /* Strip all other unreachable cases. */
7198 if (body->ext.case_list)
7200 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7202 if (cp->next->unreachable)
7204 gfc_case *n = cp->next;
7205 cp->next = cp->next->next;
7207 gfc_free_case_list (n);
7214 /* See if there were overlapping cases. If the check returns NULL,
7215 there was overlap. In that case we don't do anything. If head
7216 is non-NULL, we prepend the DEFAULT case. The sorted list can
7217 then used during code generation for SELECT CASE constructs with
7218 a case expression of a CHARACTER type. */
7221 head = check_case_overlap (head);
7223 /* Prepend the default_case if it is there. */
7224 if (head != NULL && default_case)
7226 default_case->left = NULL;
7227 default_case->right = head;
7228 head->left = default_case;
7232 /* Eliminate dead blocks that may be the result if we've seen
7233 unreachable case labels for a block. */
7234 for (body = code; body && body->block; body = body->block)
7236 if (body->block->ext.case_list == NULL)
7238 /* Cut the unreachable block from the code chain. */
7239 gfc_code *c = body->block;
7240 body->block = c->block;
7242 /* Kill the dead block, but not the blocks below it. */
7244 gfc_free_statements (c);
7248 /* More than two cases is legal but insane for logical selects.
7249 Issue a warning for it. */
7250 if (gfc_option.warn_surprising && type == BT_LOGICAL
7252 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7257 /* Check if a derived type is extensible. */
7260 gfc_type_is_extensible (gfc_symbol *sym)
7262 return !(sym->attr.is_bind_c || sym->attr.sequence);
7266 /* Resolve a SELECT TYPE statement. */
7269 resolve_select_type (gfc_code *code)
7271 gfc_symbol *selector_type;
7272 gfc_code *body, *new_st, *if_st, *tail;
7273 gfc_code *class_is = NULL, *default_case = NULL;
7276 char name[GFC_MAX_SYMBOL_LEN];
7280 ns = code->ext.block.ns;
7283 /* Check for F03:C813. */
7284 if (code->expr1->ts.type != BT_CLASS
7285 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7287 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7288 "at %L", &code->loc);
7294 if (code->expr1->symtree->n.sym->attr.untyped)
7295 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7296 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7299 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7301 /* Loop over TYPE IS / CLASS IS cases. */
7302 for (body = code->block; body; body = body->block)
7304 c = body->ext.case_list;
7306 /* Check F03:C815. */
7307 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7308 && !gfc_type_is_extensible (c->ts.u.derived))
7310 gfc_error ("Derived type '%s' at %L must be extensible",
7311 c->ts.u.derived->name, &c->where);
7316 /* Check F03:C816. */
7317 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7318 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7320 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7321 c->ts.u.derived->name, &c->where, selector_type->name);
7326 /* Intercept the DEFAULT case. */
7327 if (c->ts.type == BT_UNKNOWN)
7329 /* Check F03:C818. */
7332 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7333 "by a second DEFAULT CASE at %L",
7334 &default_case->ext.case_list->where, &c->where);
7339 default_case = body;
7348 /* Insert assignment for selector variable. */
7349 new_st = gfc_get_code ();
7350 new_st->op = EXEC_ASSIGN;
7351 new_st->expr1 = gfc_copy_expr (code->expr1);
7352 new_st->expr2 = gfc_copy_expr (code->expr2);
7356 /* Put SELECT TYPE statement inside a BLOCK. */
7357 new_st = gfc_get_code ();
7358 new_st->op = code->op;
7359 new_st->expr1 = code->expr1;
7360 new_st->expr2 = code->expr2;
7361 new_st->block = code->block;
7365 ns->code->next = new_st;
7366 code->op = EXEC_BLOCK;
7367 code->ext.block.assoc = NULL;
7368 code->expr1 = code->expr2 = NULL;
7373 /* Transform to EXEC_SELECT. */
7374 code->op = EXEC_SELECT;
7375 gfc_add_component_ref (code->expr1, "$vptr");
7376 gfc_add_component_ref (code->expr1, "$hash");
7378 /* Loop over TYPE IS / CLASS IS cases. */
7379 for (body = code->block; body; body = body->block)
7381 c = body->ext.case_list;
7383 if (c->ts.type == BT_DERIVED)
7384 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7385 c->ts.u.derived->hash_value);
7387 else if (c->ts.type == BT_UNKNOWN)
7390 /* Assign temporary to selector. */
7391 if (c->ts.type == BT_CLASS)
7392 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7394 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7395 st = gfc_find_symtree (ns->sym_root, name);
7396 new_st = gfc_get_code ();
7397 new_st->expr1 = gfc_get_variable_expr (st);
7398 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7399 if (c->ts.type == BT_DERIVED)
7401 new_st->op = EXEC_POINTER_ASSIGN;
7402 gfc_add_component_ref (new_st->expr2, "$data");
7405 new_st->op = EXEC_POINTER_ASSIGN;
7406 new_st->next = body->next;
7407 body->next = new_st;
7410 /* Take out CLASS IS cases for separate treatment. */
7412 while (body && body->block)
7414 if (body->block->ext.case_list->ts.type == BT_CLASS)
7416 /* Add to class_is list. */
7417 if (class_is == NULL)
7419 class_is = body->block;
7424 for (tail = class_is; tail->block; tail = tail->block) ;
7425 tail->block = body->block;
7428 /* Remove from EXEC_SELECT list. */
7429 body->block = body->block->block;
7442 /* Add a default case to hold the CLASS IS cases. */
7443 for (tail = code; tail->block; tail = tail->block) ;
7444 tail->block = gfc_get_code ();
7446 tail->op = EXEC_SELECT_TYPE;
7447 tail->ext.case_list = gfc_get_case ();
7448 tail->ext.case_list->ts.type = BT_UNKNOWN;
7450 default_case = tail;
7453 /* More than one CLASS IS block? */
7454 if (class_is->block)
7458 /* Sort CLASS IS blocks by extension level. */
7462 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7465 /* F03:C817 (check for doubles). */
7466 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7467 == c2->ext.case_list->ts.u.derived->hash_value)
7469 gfc_error ("Double CLASS IS block in SELECT TYPE "
7470 "statement at %L", &c2->ext.case_list->where);
7473 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7474 < c2->ext.case_list->ts.u.derived->attr.extension)
7477 (*c1)->block = c2->block;
7487 /* Generate IF chain. */
7488 if_st = gfc_get_code ();
7489 if_st->op = EXEC_IF;
7491 for (body = class_is; body; body = body->block)
7493 new_st->block = gfc_get_code ();
7494 new_st = new_st->block;
7495 new_st->op = EXEC_IF;
7496 /* Set up IF condition: Call _gfortran_is_extension_of. */
7497 new_st->expr1 = gfc_get_expr ();
7498 new_st->expr1->expr_type = EXPR_FUNCTION;
7499 new_st->expr1->ts.type = BT_LOGICAL;
7500 new_st->expr1->ts.kind = 4;
7501 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7502 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7503 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7504 /* Set up arguments. */
7505 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7506 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7507 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7508 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived, true);
7509 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7510 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7511 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7512 new_st->next = body->next;
7514 if (default_case->next)
7516 new_st->block = gfc_get_code ();
7517 new_st = new_st->block;
7518 new_st->op = EXEC_IF;
7519 new_st->next = default_case->next;
7522 /* Replace CLASS DEFAULT code by the IF chain. */
7523 default_case->next = if_st;
7526 resolve_select (code);
7531 /* Resolve a transfer statement. This is making sure that:
7532 -- a derived type being transferred has only non-pointer components
7533 -- a derived type being transferred doesn't have private components, unless
7534 it's being transferred from the module where the type was defined
7535 -- we're not trying to transfer a whole assumed size array. */
7538 resolve_transfer (gfc_code *code)
7547 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7550 sym = exp->symtree->n.sym;
7553 /* Go to actual component transferred. */
7554 for (ref = code->expr1->ref; ref; ref = ref->next)
7555 if (ref->type == REF_COMPONENT)
7556 ts = &ref->u.c.component->ts;
7558 if (ts->type == BT_DERIVED)
7560 /* Check that transferred derived type doesn't contain POINTER
7562 if (ts->u.derived->attr.pointer_comp)
7564 gfc_error ("Data transfer element at %L cannot have "
7565 "POINTER components", &code->loc);
7569 if (ts->u.derived->attr.alloc_comp)
7571 gfc_error ("Data transfer element at %L cannot have "
7572 "ALLOCATABLE components", &code->loc);
7576 if (derived_inaccessible (ts->u.derived))
7578 gfc_error ("Data transfer element at %L cannot have "
7579 "PRIVATE components",&code->loc);
7584 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7585 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7587 gfc_error ("Data transfer element at %L cannot be a full reference to "
7588 "an assumed-size array", &code->loc);
7594 /*********** Toplevel code resolution subroutines ***********/
7596 /* Find the set of labels that are reachable from this block. We also
7597 record the last statement in each block. */
7600 find_reachable_labels (gfc_code *block)
7607 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7609 /* Collect labels in this block. We don't keep those corresponding
7610 to END {IF|SELECT}, these are checked in resolve_branch by going
7611 up through the code_stack. */
7612 for (c = block; c; c = c->next)
7614 if (c->here && c->op != EXEC_END_BLOCK)
7615 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7618 /* Merge with labels from parent block. */
7621 gcc_assert (cs_base->prev->reachable_labels);
7622 bitmap_ior_into (cs_base->reachable_labels,
7623 cs_base->prev->reachable_labels);
7629 resolve_sync (gfc_code *code)
7631 /* Check imageset. The * case matches expr1 == NULL. */
7634 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7635 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7636 "INTEGER expression", &code->expr1->where);
7637 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7638 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7639 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7640 &code->expr1->where);
7641 else if (code->expr1->expr_type == EXPR_ARRAY
7642 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7644 gfc_constructor *cons;
7645 cons = gfc_constructor_first (code->expr1->value.constructor);
7646 for (; cons; cons = gfc_constructor_next (cons))
7647 if (cons->expr->expr_type == EXPR_CONSTANT
7648 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7649 gfc_error ("Imageset argument at %L must between 1 and "
7650 "num_images()", &cons->expr->where);
7656 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7657 || code->expr2->expr_type != EXPR_VARIABLE))
7658 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7659 &code->expr2->where);
7663 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7664 || code->expr3->expr_type != EXPR_VARIABLE))
7665 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7666 &code->expr3->where);
7670 /* Given a branch to a label, see if the branch is conforming.
7671 The code node describes where the branch is located. */
7674 resolve_branch (gfc_st_label *label, gfc_code *code)
7681 /* Step one: is this a valid branching target? */
7683 if (label->defined == ST_LABEL_UNKNOWN)
7685 gfc_error ("Label %d referenced at %L is never defined", label->value,
7690 if (label->defined != ST_LABEL_TARGET)
7692 gfc_error ("Statement at %L is not a valid branch target statement "
7693 "for the branch statement at %L", &label->where, &code->loc);
7697 /* Step two: make sure this branch is not a branch to itself ;-) */
7699 if (code->here == label)
7701 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7705 /* Step three: See if the label is in the same block as the
7706 branching statement. The hard work has been done by setting up
7707 the bitmap reachable_labels. */
7709 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7711 /* Check now whether there is a CRITICAL construct; if so, check
7712 whether the label is still visible outside of the CRITICAL block,
7713 which is invalid. */
7714 for (stack = cs_base; stack; stack = stack->prev)
7715 if (stack->current->op == EXEC_CRITICAL
7716 && bitmap_bit_p (stack->reachable_labels, label->value))
7717 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7718 " at %L", &code->loc, &label->where);
7723 /* Step four: If we haven't found the label in the bitmap, it may
7724 still be the label of the END of the enclosing block, in which
7725 case we find it by going up the code_stack. */
7727 for (stack = cs_base; stack; stack = stack->prev)
7729 if (stack->current->next && stack->current->next->here == label)
7731 if (stack->current->op == EXEC_CRITICAL)
7733 /* Note: A label at END CRITICAL does not leave the CRITICAL
7734 construct as END CRITICAL is still part of it. */
7735 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7736 " at %L", &code->loc, &label->where);
7743 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7747 /* The label is not in an enclosing block, so illegal. This was
7748 allowed in Fortran 66, so we allow it as extension. No
7749 further checks are necessary in this case. */
7750 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7751 "as the GOTO statement at %L", &label->where,
7757 /* Check whether EXPR1 has the same shape as EXPR2. */
7760 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7762 mpz_t shape[GFC_MAX_DIMENSIONS];
7763 mpz_t shape2[GFC_MAX_DIMENSIONS];
7764 gfc_try result = FAILURE;
7767 /* Compare the rank. */
7768 if (expr1->rank != expr2->rank)
7771 /* Compare the size of each dimension. */
7772 for (i=0; i<expr1->rank; i++)
7774 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7777 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7780 if (mpz_cmp (shape[i], shape2[i]))
7784 /* When either of the two expression is an assumed size array, we
7785 ignore the comparison of dimension sizes. */
7790 for (i--; i >= 0; i--)
7792 mpz_clear (shape[i]);
7793 mpz_clear (shape2[i]);
7799 /* Check whether a WHERE assignment target or a WHERE mask expression
7800 has the same shape as the outmost WHERE mask expression. */
7803 resolve_where (gfc_code *code, gfc_expr *mask)
7809 cblock = code->block;
7811 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7812 In case of nested WHERE, only the outmost one is stored. */
7813 if (mask == NULL) /* outmost WHERE */
7815 else /* inner WHERE */
7822 /* Check if the mask-expr has a consistent shape with the
7823 outmost WHERE mask-expr. */
7824 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7825 gfc_error ("WHERE mask at %L has inconsistent shape",
7826 &cblock->expr1->where);
7829 /* the assignment statement of a WHERE statement, or the first
7830 statement in where-body-construct of a WHERE construct */
7831 cnext = cblock->next;
7836 /* WHERE assignment statement */
7839 /* Check shape consistent for WHERE assignment target. */
7840 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7841 gfc_error ("WHERE assignment target at %L has "
7842 "inconsistent shape", &cnext->expr1->where);
7846 case EXEC_ASSIGN_CALL:
7847 resolve_call (cnext);
7848 if (!cnext->resolved_sym->attr.elemental)
7849 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7850 &cnext->ext.actual->expr->where);
7853 /* WHERE or WHERE construct is part of a where-body-construct */
7855 resolve_where (cnext, e);
7859 gfc_error ("Unsupported statement inside WHERE at %L",
7862 /* the next statement within the same where-body-construct */
7863 cnext = cnext->next;
7865 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7866 cblock = cblock->block;
7871 /* Resolve assignment in FORALL construct.
7872 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7873 FORALL index variables. */
7876 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7880 for (n = 0; n < nvar; n++)
7882 gfc_symbol *forall_index;
7884 forall_index = var_expr[n]->symtree->n.sym;
7886 /* Check whether the assignment target is one of the FORALL index
7888 if ((code->expr1->expr_type == EXPR_VARIABLE)
7889 && (code->expr1->symtree->n.sym == forall_index))
7890 gfc_error ("Assignment to a FORALL index variable at %L",
7891 &code->expr1->where);
7894 /* If one of the FORALL index variables doesn't appear in the
7895 assignment variable, then there could be a many-to-one
7896 assignment. Emit a warning rather than an error because the
7897 mask could be resolving this problem. */
7898 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7899 gfc_warning ("The FORALL with index '%s' is not used on the "
7900 "left side of the assignment at %L and so might "
7901 "cause multiple assignment to this object",
7902 var_expr[n]->symtree->name, &code->expr1->where);
7908 /* Resolve WHERE statement in FORALL construct. */
7911 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7912 gfc_expr **var_expr)
7917 cblock = code->block;
7920 /* the assignment statement of a WHERE statement, or the first
7921 statement in where-body-construct of a WHERE construct */
7922 cnext = cblock->next;
7927 /* WHERE assignment statement */
7929 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7932 /* WHERE operator assignment statement */
7933 case EXEC_ASSIGN_CALL:
7934 resolve_call (cnext);
7935 if (!cnext->resolved_sym->attr.elemental)
7936 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7937 &cnext->ext.actual->expr->where);
7940 /* WHERE or WHERE construct is part of a where-body-construct */
7942 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7946 gfc_error ("Unsupported statement inside WHERE at %L",
7949 /* the next statement within the same where-body-construct */
7950 cnext = cnext->next;
7952 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7953 cblock = cblock->block;
7958 /* Traverse the FORALL body to check whether the following errors exist:
7959 1. For assignment, check if a many-to-one assignment happens.
7960 2. For WHERE statement, check the WHERE body to see if there is any
7961 many-to-one assignment. */
7964 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7968 c = code->block->next;
7974 case EXEC_POINTER_ASSIGN:
7975 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7978 case EXEC_ASSIGN_CALL:
7982 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7983 there is no need to handle it here. */
7987 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7992 /* The next statement in the FORALL body. */
7998 /* Counts the number of iterators needed inside a forall construct, including
7999 nested forall constructs. This is used to allocate the needed memory
8000 in gfc_resolve_forall. */
8003 gfc_count_forall_iterators (gfc_code *code)
8005 int max_iters, sub_iters, current_iters;
8006 gfc_forall_iterator *fa;
8008 gcc_assert(code->op == EXEC_FORALL);
8012 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8015 code = code->block->next;
8019 if (code->op == EXEC_FORALL)
8021 sub_iters = gfc_count_forall_iterators (code);
8022 if (sub_iters > max_iters)
8023 max_iters = sub_iters;
8028 return current_iters + max_iters;
8032 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8033 gfc_resolve_forall_body to resolve the FORALL body. */
8036 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8038 static gfc_expr **var_expr;
8039 static int total_var = 0;
8040 static int nvar = 0;
8042 gfc_forall_iterator *fa;
8047 /* Start to resolve a FORALL construct */
8048 if (forall_save == 0)
8050 /* Count the total number of FORALL index in the nested FORALL
8051 construct in order to allocate the VAR_EXPR with proper size. */
8052 total_var = gfc_count_forall_iterators (code);
8054 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8055 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
8058 /* The information about FORALL iterator, including FORALL index start, end
8059 and stride. The FORALL index can not appear in start, end or stride. */
8060 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8062 /* Check if any outer FORALL index name is the same as the current
8064 for (i = 0; i < nvar; i++)
8066 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8068 gfc_error ("An outer FORALL construct already has an index "
8069 "with this name %L", &fa->var->where);
8073 /* Record the current FORALL index. */
8074 var_expr[nvar] = gfc_copy_expr (fa->var);
8078 /* No memory leak. */
8079 gcc_assert (nvar <= total_var);
8082 /* Resolve the FORALL body. */
8083 gfc_resolve_forall_body (code, nvar, var_expr);
8085 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8086 gfc_resolve_blocks (code->block, ns);
8090 /* Free only the VAR_EXPRs allocated in this frame. */
8091 for (i = nvar; i < tmp; i++)
8092 gfc_free_expr (var_expr[i]);
8096 /* We are in the outermost FORALL construct. */
8097 gcc_assert (forall_save == 0);
8099 /* VAR_EXPR is not needed any more. */
8100 gfc_free (var_expr);
8106 /* Resolve a BLOCK construct statement. */
8109 resolve_block_construct (gfc_code* code)
8111 /* For an ASSOCIATE block, the associations (and their targets) are already
8112 resolved during gfc_resolve_symbol. */
8114 /* Resolve the BLOCK's namespace. */
8115 gfc_resolve (code->ext.block.ns);
8119 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8122 static void resolve_code (gfc_code *, gfc_namespace *);
8125 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8129 for (; b; b = b->block)
8131 t = gfc_resolve_expr (b->expr1);
8132 if (gfc_resolve_expr (b->expr2) == FAILURE)
8138 if (t == SUCCESS && b->expr1 != NULL
8139 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8140 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8147 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8148 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8153 resolve_branch (b->label1, b);
8157 resolve_block_construct (b);
8161 case EXEC_SELECT_TYPE:
8172 case EXEC_OMP_ATOMIC:
8173 case EXEC_OMP_CRITICAL:
8175 case EXEC_OMP_MASTER:
8176 case EXEC_OMP_ORDERED:
8177 case EXEC_OMP_PARALLEL:
8178 case EXEC_OMP_PARALLEL_DO:
8179 case EXEC_OMP_PARALLEL_SECTIONS:
8180 case EXEC_OMP_PARALLEL_WORKSHARE:
8181 case EXEC_OMP_SECTIONS:
8182 case EXEC_OMP_SINGLE:
8184 case EXEC_OMP_TASKWAIT:
8185 case EXEC_OMP_WORKSHARE:
8189 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8192 resolve_code (b->next, ns);
8197 /* Does everything to resolve an ordinary assignment. Returns true
8198 if this is an interface assignment. */
8200 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8210 if (gfc_extend_assign (code, ns) == SUCCESS)
8214 if (code->op == EXEC_ASSIGN_CALL)
8216 lhs = code->ext.actual->expr;
8217 rhsptr = &code->ext.actual->next->expr;
8221 gfc_actual_arglist* args;
8222 gfc_typebound_proc* tbp;
8224 gcc_assert (code->op == EXEC_COMPCALL);
8226 args = code->expr1->value.compcall.actual;
8228 rhsptr = &args->next->expr;
8230 tbp = code->expr1->value.compcall.tbp;
8231 gcc_assert (!tbp->is_generic);
8234 /* Make a temporary rhs when there is a default initializer
8235 and rhs is the same symbol as the lhs. */
8236 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8237 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8238 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8239 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8240 *rhsptr = gfc_get_parentheses (*rhsptr);
8249 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8250 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8251 &code->loc) == FAILURE)
8254 /* Handle the case of a BOZ literal on the RHS. */
8255 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8258 if (gfc_option.warn_surprising)
8259 gfc_warning ("BOZ literal at %L is bitwise transferred "
8260 "non-integer symbol '%s'", &code->loc,
8261 lhs->symtree->n.sym->name);
8263 if (!gfc_convert_boz (rhs, &lhs->ts))
8265 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8267 if (rc == ARITH_UNDERFLOW)
8268 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8269 ". This check can be disabled with the option "
8270 "-fno-range-check", &rhs->where);
8271 else if (rc == ARITH_OVERFLOW)
8272 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8273 ". This check can be disabled with the option "
8274 "-fno-range-check", &rhs->where);
8275 else if (rc == ARITH_NAN)
8276 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8277 ". This check can be disabled with the option "
8278 "-fno-range-check", &rhs->where);
8284 if (lhs->ts.type == BT_CHARACTER
8285 && gfc_option.warn_character_truncation)
8287 if (lhs->ts.u.cl != NULL
8288 && lhs->ts.u.cl->length != NULL
8289 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8290 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8292 if (rhs->expr_type == EXPR_CONSTANT)
8293 rlen = rhs->value.character.length;
8295 else if (rhs->ts.u.cl != NULL
8296 && rhs->ts.u.cl->length != NULL
8297 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8298 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8300 if (rlen && llen && rlen > llen)
8301 gfc_warning_now ("CHARACTER expression will be truncated "
8302 "in assignment (%d/%d) at %L",
8303 llen, rlen, &code->loc);
8306 /* Ensure that a vector index expression for the lvalue is evaluated
8307 to a temporary if the lvalue symbol is referenced in it. */
8310 for (ref = lhs->ref; ref; ref= ref->next)
8311 if (ref->type == REF_ARRAY)
8313 for (n = 0; n < ref->u.ar.dimen; n++)
8314 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8315 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8316 ref->u.ar.start[n]))
8318 = gfc_get_parentheses (ref->u.ar.start[n]);
8322 if (gfc_pure (NULL))
8324 if (gfc_impure_variable (lhs->symtree->n.sym))
8326 gfc_error ("Cannot assign to variable '%s' in PURE "
8328 lhs->symtree->n.sym->name,
8333 if (lhs->ts.type == BT_DERIVED
8334 && lhs->expr_type == EXPR_VARIABLE
8335 && lhs->ts.u.derived->attr.pointer_comp
8336 && rhs->expr_type == EXPR_VARIABLE
8337 && (gfc_impure_variable (rhs->symtree->n.sym)
8338 || gfc_is_coindexed (rhs)))
8341 if (gfc_is_coindexed (rhs))
8342 gfc_error ("Coindexed expression at %L is assigned to "
8343 "a derived type variable with a POINTER "
8344 "component in a PURE procedure",
8347 gfc_error ("The impure variable at %L is assigned to "
8348 "a derived type variable with a POINTER "
8349 "component in a PURE procedure (12.6)",
8354 /* Fortran 2008, C1283. */
8355 if (gfc_is_coindexed (lhs))
8357 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8358 "procedure", &rhs->where);
8364 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8365 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8366 if (lhs->ts.type == BT_CLASS)
8368 gfc_error ("Variable must not be polymorphic in assignment at %L",
8373 /* F2008, Section 7.2.1.2. */
8374 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8376 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8377 "component in assignment at %L", &lhs->where);
8381 gfc_check_assign (lhs, rhs, 1);
8386 /* Given a block of code, recursively resolve everything pointed to by this
8390 resolve_code (gfc_code *code, gfc_namespace *ns)
8392 int omp_workshare_save;
8397 frame.prev = cs_base;
8401 find_reachable_labels (code);
8403 for (; code; code = code->next)
8405 frame.current = code;
8406 forall_save = forall_flag;
8408 if (code->op == EXEC_FORALL)
8411 gfc_resolve_forall (code, ns, forall_save);
8414 else if (code->block)
8416 omp_workshare_save = -1;
8419 case EXEC_OMP_PARALLEL_WORKSHARE:
8420 omp_workshare_save = omp_workshare_flag;
8421 omp_workshare_flag = 1;
8422 gfc_resolve_omp_parallel_blocks (code, ns);
8424 case EXEC_OMP_PARALLEL:
8425 case EXEC_OMP_PARALLEL_DO:
8426 case EXEC_OMP_PARALLEL_SECTIONS:
8428 omp_workshare_save = omp_workshare_flag;
8429 omp_workshare_flag = 0;
8430 gfc_resolve_omp_parallel_blocks (code, ns);
8433 gfc_resolve_omp_do_blocks (code, ns);
8435 case EXEC_SELECT_TYPE:
8436 gfc_current_ns = code->ext.block.ns;
8437 gfc_resolve_blocks (code->block, gfc_current_ns);
8438 gfc_current_ns = ns;
8440 case EXEC_OMP_WORKSHARE:
8441 omp_workshare_save = omp_workshare_flag;
8442 omp_workshare_flag = 1;
8445 gfc_resolve_blocks (code->block, ns);
8449 if (omp_workshare_save != -1)
8450 omp_workshare_flag = omp_workshare_save;
8454 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8455 t = gfc_resolve_expr (code->expr1);
8456 forall_flag = forall_save;
8458 if (gfc_resolve_expr (code->expr2) == FAILURE)
8461 if (code->op == EXEC_ALLOCATE
8462 && gfc_resolve_expr (code->expr3) == FAILURE)
8468 case EXEC_END_BLOCK:
8472 case EXEC_ERROR_STOP:
8476 case EXEC_ASSIGN_CALL:
8481 case EXEC_SYNC_IMAGES:
8482 case EXEC_SYNC_MEMORY:
8483 resolve_sync (code);
8487 /* Keep track of which entry we are up to. */
8488 current_entry_id = code->ext.entry->id;
8492 resolve_where (code, NULL);
8496 if (code->expr1 != NULL)
8498 if (code->expr1->ts.type != BT_INTEGER)
8499 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8500 "INTEGER variable", &code->expr1->where);
8501 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8502 gfc_error ("Variable '%s' has not been assigned a target "
8503 "label at %L", code->expr1->symtree->n.sym->name,
8504 &code->expr1->where);
8507 resolve_branch (code->label1, code);
8511 if (code->expr1 != NULL
8512 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8513 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8514 "INTEGER return specifier", &code->expr1->where);
8517 case EXEC_INIT_ASSIGN:
8518 case EXEC_END_PROCEDURE:
8525 if (resolve_ordinary_assign (code, ns))
8527 if (code->op == EXEC_COMPCALL)
8534 case EXEC_LABEL_ASSIGN:
8535 if (code->label1->defined == ST_LABEL_UNKNOWN)
8536 gfc_error ("Label %d referenced at %L is never defined",
8537 code->label1->value, &code->label1->where);
8539 && (code->expr1->expr_type != EXPR_VARIABLE
8540 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8541 || code->expr1->symtree->n.sym->ts.kind
8542 != gfc_default_integer_kind
8543 || code->expr1->symtree->n.sym->as != NULL))
8544 gfc_error ("ASSIGN statement at %L requires a scalar "
8545 "default INTEGER variable", &code->expr1->where);
8548 case EXEC_POINTER_ASSIGN:
8552 gfc_check_pointer_assign (code->expr1, code->expr2);
8555 case EXEC_ARITHMETIC_IF:
8557 && code->expr1->ts.type != BT_INTEGER
8558 && code->expr1->ts.type != BT_REAL)
8559 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8560 "expression", &code->expr1->where);
8562 resolve_branch (code->label1, code);
8563 resolve_branch (code->label2, code);
8564 resolve_branch (code->label3, code);
8568 if (t == SUCCESS && code->expr1 != NULL
8569 && (code->expr1->ts.type != BT_LOGICAL
8570 || code->expr1->rank != 0))
8571 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8572 &code->expr1->where);
8577 resolve_call (code);
8582 resolve_typebound_subroutine (code);
8586 resolve_ppc_call (code);
8590 /* Select is complicated. Also, a SELECT construct could be
8591 a transformed computed GOTO. */
8592 resolve_select (code);
8595 case EXEC_SELECT_TYPE:
8596 resolve_select_type (code);
8600 gfc_resolve (code->ext.block.ns);
8604 if (code->ext.iterator != NULL)
8606 gfc_iterator *iter = code->ext.iterator;
8607 if (gfc_resolve_iterator (iter, true) != FAILURE)
8608 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8613 if (code->expr1 == NULL)
8614 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8616 && (code->expr1->rank != 0
8617 || code->expr1->ts.type != BT_LOGICAL))
8618 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8619 "a scalar LOGICAL expression", &code->expr1->where);
8624 resolve_allocate_deallocate (code, "ALLOCATE");
8628 case EXEC_DEALLOCATE:
8630 resolve_allocate_deallocate (code, "DEALLOCATE");
8635 if (gfc_resolve_open (code->ext.open) == FAILURE)
8638 resolve_branch (code->ext.open->err, code);
8642 if (gfc_resolve_close (code->ext.close) == FAILURE)
8645 resolve_branch (code->ext.close->err, code);
8648 case EXEC_BACKSPACE:
8652 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8655 resolve_branch (code->ext.filepos->err, code);
8659 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8662 resolve_branch (code->ext.inquire->err, code);
8666 gcc_assert (code->ext.inquire != NULL);
8667 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8670 resolve_branch (code->ext.inquire->err, code);
8674 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8677 resolve_branch (code->ext.wait->err, code);
8678 resolve_branch (code->ext.wait->end, code);
8679 resolve_branch (code->ext.wait->eor, code);
8684 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8687 resolve_branch (code->ext.dt->err, code);
8688 resolve_branch (code->ext.dt->end, code);
8689 resolve_branch (code->ext.dt->eor, code);
8693 resolve_transfer (code);
8697 resolve_forall_iterators (code->ext.forall_iterator);
8699 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8700 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8701 "expression", &code->expr1->where);
8704 case EXEC_OMP_ATOMIC:
8705 case EXEC_OMP_BARRIER:
8706 case EXEC_OMP_CRITICAL:
8707 case EXEC_OMP_FLUSH:
8709 case EXEC_OMP_MASTER:
8710 case EXEC_OMP_ORDERED:
8711 case EXEC_OMP_SECTIONS:
8712 case EXEC_OMP_SINGLE:
8713 case EXEC_OMP_TASKWAIT:
8714 case EXEC_OMP_WORKSHARE:
8715 gfc_resolve_omp_directive (code, ns);
8718 case EXEC_OMP_PARALLEL:
8719 case EXEC_OMP_PARALLEL_DO:
8720 case EXEC_OMP_PARALLEL_SECTIONS:
8721 case EXEC_OMP_PARALLEL_WORKSHARE:
8723 omp_workshare_save = omp_workshare_flag;
8724 omp_workshare_flag = 0;
8725 gfc_resolve_omp_directive (code, ns);
8726 omp_workshare_flag = omp_workshare_save;
8730 gfc_internal_error ("resolve_code(): Bad statement code");
8734 cs_base = frame.prev;
8738 /* Resolve initial values and make sure they are compatible with
8742 resolve_values (gfc_symbol *sym)
8744 if (sym->value == NULL)
8747 if (gfc_resolve_expr (sym->value) == FAILURE)
8750 gfc_check_assign_symbol (sym, sym->value);
8754 /* Verify the binding labels for common blocks that are BIND(C). The label
8755 for a BIND(C) common block must be identical in all scoping units in which
8756 the common block is declared. Further, the binding label can not collide
8757 with any other global entity in the program. */
8760 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8762 if (comm_block_tree->n.common->is_bind_c == 1)
8764 gfc_gsymbol *binding_label_gsym;
8765 gfc_gsymbol *comm_name_gsym;
8767 /* See if a global symbol exists by the common block's name. It may
8768 be NULL if the common block is use-associated. */
8769 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8770 comm_block_tree->n.common->name);
8771 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8772 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8773 "with the global entity '%s' at %L",
8774 comm_block_tree->n.common->binding_label,
8775 comm_block_tree->n.common->name,
8776 &(comm_block_tree->n.common->where),
8777 comm_name_gsym->name, &(comm_name_gsym->where));
8778 else if (comm_name_gsym != NULL
8779 && strcmp (comm_name_gsym->name,
8780 comm_block_tree->n.common->name) == 0)
8782 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8784 if (comm_name_gsym->binding_label == NULL)
8785 /* No binding label for common block stored yet; save this one. */
8786 comm_name_gsym->binding_label =
8787 comm_block_tree->n.common->binding_label;
8789 if (strcmp (comm_name_gsym->binding_label,
8790 comm_block_tree->n.common->binding_label) != 0)
8792 /* Common block names match but binding labels do not. */
8793 gfc_error ("Binding label '%s' for common block '%s' at %L "
8794 "does not match the binding label '%s' for common "
8796 comm_block_tree->n.common->binding_label,
8797 comm_block_tree->n.common->name,
8798 &(comm_block_tree->n.common->where),
8799 comm_name_gsym->binding_label,
8800 comm_name_gsym->name,
8801 &(comm_name_gsym->where));
8806 /* There is no binding label (NAME="") so we have nothing further to
8807 check and nothing to add as a global symbol for the label. */
8808 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8811 binding_label_gsym =
8812 gfc_find_gsymbol (gfc_gsym_root,
8813 comm_block_tree->n.common->binding_label);
8814 if (binding_label_gsym == NULL)
8816 /* Need to make a global symbol for the binding label to prevent
8817 it from colliding with another. */
8818 binding_label_gsym =
8819 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8820 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8821 binding_label_gsym->type = GSYM_COMMON;
8825 /* If comm_name_gsym is NULL, the name common block is use
8826 associated and the name could be colliding. */
8827 if (binding_label_gsym->type != GSYM_COMMON)
8828 gfc_error ("Binding label '%s' for common block '%s' at %L "
8829 "collides with the global entity '%s' at %L",
8830 comm_block_tree->n.common->binding_label,
8831 comm_block_tree->n.common->name,
8832 &(comm_block_tree->n.common->where),
8833 binding_label_gsym->name,
8834 &(binding_label_gsym->where));
8835 else if (comm_name_gsym != NULL
8836 && (strcmp (binding_label_gsym->name,
8837 comm_name_gsym->binding_label) != 0)
8838 && (strcmp (binding_label_gsym->sym_name,
8839 comm_name_gsym->name) != 0))
8840 gfc_error ("Binding label '%s' for common block '%s' at %L "
8841 "collides with global entity '%s' at %L",
8842 binding_label_gsym->name, binding_label_gsym->sym_name,
8843 &(comm_block_tree->n.common->where),
8844 comm_name_gsym->name, &(comm_name_gsym->where));
8852 /* Verify any BIND(C) derived types in the namespace so we can report errors
8853 for them once, rather than for each variable declared of that type. */
8856 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8858 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8859 && derived_sym->attr.is_bind_c == 1)
8860 verify_bind_c_derived_type (derived_sym);
8866 /* Verify that any binding labels used in a given namespace do not collide
8867 with the names or binding labels of any global symbols. */
8870 gfc_verify_binding_labels (gfc_symbol *sym)
8874 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8875 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8877 gfc_gsymbol *bind_c_sym;
8879 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8880 if (bind_c_sym != NULL
8881 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8883 if (sym->attr.if_source == IFSRC_DECL
8884 && (bind_c_sym->type != GSYM_SUBROUTINE
8885 && bind_c_sym->type != GSYM_FUNCTION)
8886 && ((sym->attr.contained == 1
8887 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8888 || (sym->attr.use_assoc == 1
8889 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8891 /* Make sure global procedures don't collide with anything. */
8892 gfc_error ("Binding label '%s' at %L collides with the global "
8893 "entity '%s' at %L", sym->binding_label,
8894 &(sym->declared_at), bind_c_sym->name,
8895 &(bind_c_sym->where));
8898 else if (sym->attr.contained == 0
8899 && (sym->attr.if_source == IFSRC_IFBODY
8900 && sym->attr.flavor == FL_PROCEDURE)
8901 && (bind_c_sym->sym_name != NULL
8902 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8904 /* Make sure procedures in interface bodies don't collide. */
8905 gfc_error ("Binding label '%s' in interface body at %L collides "
8906 "with the global entity '%s' at %L",
8908 &(sym->declared_at), bind_c_sym->name,
8909 &(bind_c_sym->where));
8912 else if (sym->attr.contained == 0
8913 && sym->attr.if_source == IFSRC_UNKNOWN)
8914 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8915 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8916 || sym->attr.use_assoc == 0)
8918 gfc_error ("Binding label '%s' at %L collides with global "
8919 "entity '%s' at %L", sym->binding_label,
8920 &(sym->declared_at), bind_c_sym->name,
8921 &(bind_c_sym->where));
8926 /* Clear the binding label to prevent checking multiple times. */
8927 sym->binding_label[0] = '\0';
8929 else if (bind_c_sym == NULL)
8931 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8932 bind_c_sym->where = sym->declared_at;
8933 bind_c_sym->sym_name = sym->name;
8935 if (sym->attr.use_assoc == 1)
8936 bind_c_sym->mod_name = sym->module;
8938 if (sym->ns->proc_name != NULL)
8939 bind_c_sym->mod_name = sym->ns->proc_name->name;
8941 if (sym->attr.contained == 0)
8943 if (sym->attr.subroutine)
8944 bind_c_sym->type = GSYM_SUBROUTINE;
8945 else if (sym->attr.function)
8946 bind_c_sym->type = GSYM_FUNCTION;
8954 /* Resolve an index expression. */
8957 resolve_index_expr (gfc_expr *e)
8959 if (gfc_resolve_expr (e) == FAILURE)
8962 if (gfc_simplify_expr (e, 0) == FAILURE)
8965 if (gfc_specification_expr (e) == FAILURE)
8971 /* Resolve a charlen structure. */
8974 resolve_charlen (gfc_charlen *cl)
8983 specification_expr = 1;
8985 if (resolve_index_expr (cl->length) == FAILURE)
8987 specification_expr = 0;
8991 /* "If the character length parameter value evaluates to a negative
8992 value, the length of character entities declared is zero." */
8993 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8995 if (gfc_option.warn_surprising)
8996 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8997 " the length has been set to zero",
8998 &cl->length->where, i);
8999 gfc_replace_expr (cl->length,
9000 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9003 /* Check that the character length is not too large. */
9004 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9005 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9006 && cl->length->ts.type == BT_INTEGER
9007 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9009 gfc_error ("String length at %L is too large", &cl->length->where);
9017 /* Test for non-constant shape arrays. */
9020 is_non_constant_shape_array (gfc_symbol *sym)
9026 not_constant = false;
9027 if (sym->as != NULL)
9029 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9030 has not been simplified; parameter array references. Do the
9031 simplification now. */
9032 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9034 e = sym->as->lower[i];
9035 if (e && (resolve_index_expr (e) == FAILURE
9036 || !gfc_is_constant_expr (e)))
9037 not_constant = true;
9038 e = sym->as->upper[i];
9039 if (e && (resolve_index_expr (e) == FAILURE
9040 || !gfc_is_constant_expr (e)))
9041 not_constant = true;
9044 return not_constant;
9047 /* Given a symbol and an initialization expression, add code to initialize
9048 the symbol to the function entry. */
9050 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9054 gfc_namespace *ns = sym->ns;
9056 /* Search for the function namespace if this is a contained
9057 function without an explicit result. */
9058 if (sym->attr.function && sym == sym->result
9059 && sym->name != sym->ns->proc_name->name)
9062 for (;ns; ns = ns->sibling)
9063 if (strcmp (ns->proc_name->name, sym->name) == 0)
9069 gfc_free_expr (init);
9073 /* Build an l-value expression for the result. */
9074 lval = gfc_lval_expr_from_sym (sym);
9076 /* Add the code at scope entry. */
9077 init_st = gfc_get_code ();
9078 init_st->next = ns->code;
9081 /* Assign the default initializer to the l-value. */
9082 init_st->loc = sym->declared_at;
9083 init_st->op = EXEC_INIT_ASSIGN;
9084 init_st->expr1 = lval;
9085 init_st->expr2 = init;
9088 /* Assign the default initializer to a derived type variable or result. */
9091 apply_default_init (gfc_symbol *sym)
9093 gfc_expr *init = NULL;
9095 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9098 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9099 init = gfc_default_initializer (&sym->ts);
9104 build_init_assign (sym, init);
9107 /* Build an initializer for a local integer, real, complex, logical, or
9108 character variable, based on the command line flags finit-local-zero,
9109 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9110 null if the symbol should not have a default initialization. */
9112 build_default_init_expr (gfc_symbol *sym)
9115 gfc_expr *init_expr;
9118 /* These symbols should never have a default initialization. */
9119 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9120 || sym->attr.external
9122 || sym->attr.pointer
9123 || sym->attr.in_equivalence
9124 || sym->attr.in_common
9127 || sym->attr.cray_pointee
9128 || sym->attr.cray_pointer)
9131 /* Now we'll try to build an initializer expression. */
9132 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9135 /* We will only initialize integers, reals, complex, logicals, and
9136 characters, and only if the corresponding command-line flags
9137 were set. Otherwise, we free init_expr and return null. */
9138 switch (sym->ts.type)
9141 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9142 mpz_init_set_si (init_expr->value.integer,
9143 gfc_option.flag_init_integer_value);
9146 gfc_free_expr (init_expr);
9152 mpfr_init (init_expr->value.real);
9153 switch (gfc_option.flag_init_real)
9155 case GFC_INIT_REAL_SNAN:
9156 init_expr->is_snan = 1;
9158 case GFC_INIT_REAL_NAN:
9159 mpfr_set_nan (init_expr->value.real);
9162 case GFC_INIT_REAL_INF:
9163 mpfr_set_inf (init_expr->value.real, 1);
9166 case GFC_INIT_REAL_NEG_INF:
9167 mpfr_set_inf (init_expr->value.real, -1);
9170 case GFC_INIT_REAL_ZERO:
9171 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9175 gfc_free_expr (init_expr);
9182 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
9183 switch (gfc_option.flag_init_real)
9185 case GFC_INIT_REAL_SNAN:
9186 init_expr->is_snan = 1;
9188 case GFC_INIT_REAL_NAN:
9189 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9190 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9193 case GFC_INIT_REAL_INF:
9194 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9195 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9198 case GFC_INIT_REAL_NEG_INF:
9199 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9200 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9203 case GFC_INIT_REAL_ZERO:
9204 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9208 gfc_free_expr (init_expr);
9215 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9216 init_expr->value.logical = 0;
9217 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9218 init_expr->value.logical = 1;
9221 gfc_free_expr (init_expr);
9227 /* For characters, the length must be constant in order to
9228 create a default initializer. */
9229 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9230 && sym->ts.u.cl->length
9231 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9233 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9234 init_expr->value.character.length = char_len;
9235 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9236 for (i = 0; i < char_len; i++)
9237 init_expr->value.character.string[i]
9238 = (unsigned char) gfc_option.flag_init_character_value;
9242 gfc_free_expr (init_expr);
9248 gfc_free_expr (init_expr);
9254 /* Add an initialization expression to a local variable. */
9256 apply_default_init_local (gfc_symbol *sym)
9258 gfc_expr *init = NULL;
9260 /* The symbol should be a variable or a function return value. */
9261 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9262 || (sym->attr.function && sym->result != sym))
9265 /* Try to build the initializer expression. If we can't initialize
9266 this symbol, then init will be NULL. */
9267 init = build_default_init_expr (sym);
9271 /* For saved variables, we don't want to add an initializer at
9272 function entry, so we just add a static initializer. */
9273 if (sym->attr.save || sym->ns->save_all
9274 || gfc_option.flag_max_stack_var_size == 0)
9276 /* Don't clobber an existing initializer! */
9277 gcc_assert (sym->value == NULL);
9282 build_init_assign (sym, init);
9285 /* Resolution of common features of flavors variable and procedure. */
9288 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9290 /* Constraints on deferred shape variable. */
9291 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9293 if (sym->attr.allocatable)
9295 if (sym->attr.dimension)
9297 gfc_error ("Allocatable array '%s' at %L must have "
9298 "a deferred shape", sym->name, &sym->declared_at);
9301 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9302 "may not be ALLOCATABLE", sym->name,
9303 &sym->declared_at) == FAILURE)
9307 if (sym->attr.pointer && sym->attr.dimension)
9309 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9310 sym->name, &sym->declared_at);
9317 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9318 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9320 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9321 sym->name, &sym->declared_at);
9326 /* Constraints on polymorphic variables. */
9327 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9330 if (!gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9332 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9333 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9339 /* Assume that use associated symbols were checked in the module ns. */
9340 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9342 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9343 "or pointer", sym->name, &sym->declared_at);
9352 /* Additional checks for symbols with flavor variable and derived
9353 type. To be called from resolve_fl_variable. */
9356 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9358 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9360 /* Check to see if a derived type is blocked from being host
9361 associated by the presence of another class I symbol in the same
9362 namespace. 14.6.1.3 of the standard and the discussion on
9363 comp.lang.fortran. */
9364 if (sym->ns != sym->ts.u.derived->ns
9365 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9368 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9369 if (s && s->attr.flavor != FL_DERIVED)
9371 gfc_error ("The type '%s' cannot be host associated at %L "
9372 "because it is blocked by an incompatible object "
9373 "of the same name declared at %L",
9374 sym->ts.u.derived->name, &sym->declared_at,
9380 /* 4th constraint in section 11.3: "If an object of a type for which
9381 component-initialization is specified (R429) appears in the
9382 specification-part of a module and does not have the ALLOCATABLE
9383 or POINTER attribute, the object shall have the SAVE attribute."
9385 The check for initializers is performed with
9386 gfc_has_default_initializer because gfc_default_initializer generates
9387 a hidden default for allocatable components. */
9388 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9389 && sym->ns->proc_name->attr.flavor == FL_MODULE
9390 && !sym->ns->save_all && !sym->attr.save
9391 && !sym->attr.pointer && !sym->attr.allocatable
9392 && gfc_has_default_initializer (sym->ts.u.derived)
9393 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9394 "module variable '%s' at %L, needed due to "
9395 "the default initialization", sym->name,
9396 &sym->declared_at) == FAILURE)
9399 /* Assign default initializer. */
9400 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9401 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9403 sym->value = gfc_default_initializer (&sym->ts);
9410 /* Resolve symbols with flavor variable. */
9413 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9415 int no_init_flag, automatic_flag;
9417 const char *auto_save_msg;
9419 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9422 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9425 /* Set this flag to check that variables are parameters of all entries.
9426 This check is effected by the call to gfc_resolve_expr through
9427 is_non_constant_shape_array. */
9428 specification_expr = 1;
9430 if (sym->ns->proc_name
9431 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9432 || sym->ns->proc_name->attr.is_main_program)
9433 && !sym->attr.use_assoc
9434 && !sym->attr.allocatable
9435 && !sym->attr.pointer
9436 && is_non_constant_shape_array (sym))
9438 /* The shape of a main program or module array needs to be
9440 gfc_error ("The module or main program array '%s' at %L must "
9441 "have constant shape", sym->name, &sym->declared_at);
9442 specification_expr = 0;
9446 if (sym->ts.type == BT_CHARACTER)
9448 /* Make sure that character string variables with assumed length are
9450 e = sym->ts.u.cl->length;
9451 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9453 gfc_error ("Entity with assumed character length at %L must be a "
9454 "dummy argument or a PARAMETER", &sym->declared_at);
9458 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9460 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9464 if (!gfc_is_constant_expr (e)
9465 && !(e->expr_type == EXPR_VARIABLE
9466 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9467 && sym->ns->proc_name
9468 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9469 || sym->ns->proc_name->attr.is_main_program)
9470 && !sym->attr.use_assoc)
9472 gfc_error ("'%s' at %L must have constant character length "
9473 "in this context", sym->name, &sym->declared_at);
9478 if (sym->value == NULL && sym->attr.referenced)
9479 apply_default_init_local (sym); /* Try to apply a default initialization. */
9481 /* Determine if the symbol may not have an initializer. */
9482 no_init_flag = automatic_flag = 0;
9483 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9484 || sym->attr.intrinsic || sym->attr.result)
9486 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9487 && is_non_constant_shape_array (sym))
9489 no_init_flag = automatic_flag = 1;
9491 /* Also, they must not have the SAVE attribute.
9492 SAVE_IMPLICIT is checked below. */
9493 if (sym->attr.save == SAVE_EXPLICIT)
9495 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9500 /* Ensure that any initializer is simplified. */
9502 gfc_simplify_expr (sym->value, 1);
9504 /* Reject illegal initializers. */
9505 if (!sym->mark && sym->value)
9507 if (sym->attr.allocatable)
9508 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9509 sym->name, &sym->declared_at);
9510 else if (sym->attr.external)
9511 gfc_error ("External '%s' at %L cannot have an initializer",
9512 sym->name, &sym->declared_at);
9513 else if (sym->attr.dummy
9514 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9515 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9516 sym->name, &sym->declared_at);
9517 else if (sym->attr.intrinsic)
9518 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9519 sym->name, &sym->declared_at);
9520 else if (sym->attr.result)
9521 gfc_error ("Function result '%s' at %L cannot have an initializer",
9522 sym->name, &sym->declared_at);
9523 else if (automatic_flag)
9524 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9525 sym->name, &sym->declared_at);
9532 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9533 return resolve_fl_variable_derived (sym, no_init_flag);
9539 /* Resolve a procedure. */
9542 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9544 gfc_formal_arglist *arg;
9546 if (sym->attr.function
9547 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9550 if (sym->ts.type == BT_CHARACTER)
9552 gfc_charlen *cl = sym->ts.u.cl;
9554 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9555 && resolve_charlen (cl) == FAILURE)
9558 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9559 && sym->attr.proc == PROC_ST_FUNCTION)
9561 gfc_error ("Character-valued statement function '%s' at %L must "
9562 "have constant length", sym->name, &sym->declared_at);
9567 /* Ensure that derived type for are not of a private type. Internal
9568 module procedures are excluded by 2.2.3.3 - i.e., they are not
9569 externally accessible and can access all the objects accessible in
9571 if (!(sym->ns->parent
9572 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9573 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9575 gfc_interface *iface;
9577 for (arg = sym->formal; arg; arg = arg->next)
9580 && arg->sym->ts.type == BT_DERIVED
9581 && !arg->sym->ts.u.derived->attr.use_assoc
9582 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9583 arg->sym->ts.u.derived->ns->default_access)
9584 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9585 "PRIVATE type and cannot be a dummy argument"
9586 " of '%s', which is PUBLIC at %L",
9587 arg->sym->name, sym->name, &sym->declared_at)
9590 /* Stop this message from recurring. */
9591 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9596 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9597 PRIVATE to the containing module. */
9598 for (iface = sym->generic; iface; iface = iface->next)
9600 for (arg = iface->sym->formal; arg; arg = arg->next)
9603 && arg->sym->ts.type == BT_DERIVED
9604 && !arg->sym->ts.u.derived->attr.use_assoc
9605 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9606 arg->sym->ts.u.derived->ns->default_access)
9607 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9608 "'%s' in PUBLIC interface '%s' at %L "
9609 "takes dummy arguments of '%s' which is "
9610 "PRIVATE", iface->sym->name, sym->name,
9611 &iface->sym->declared_at,
9612 gfc_typename (&arg->sym->ts)) == FAILURE)
9614 /* Stop this message from recurring. */
9615 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9621 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9622 PRIVATE to the containing module. */
9623 for (iface = sym->generic; iface; iface = iface->next)
9625 for (arg = iface->sym->formal; arg; arg = arg->next)
9628 && arg->sym->ts.type == BT_DERIVED
9629 && !arg->sym->ts.u.derived->attr.use_assoc
9630 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9631 arg->sym->ts.u.derived->ns->default_access)
9632 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9633 "'%s' in PUBLIC interface '%s' at %L "
9634 "takes dummy arguments of '%s' which is "
9635 "PRIVATE", iface->sym->name, sym->name,
9636 &iface->sym->declared_at,
9637 gfc_typename (&arg->sym->ts)) == FAILURE)
9639 /* Stop this message from recurring. */
9640 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9647 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9648 && !sym->attr.proc_pointer)
9650 gfc_error ("Function '%s' at %L cannot have an initializer",
9651 sym->name, &sym->declared_at);
9655 /* An external symbol may not have an initializer because it is taken to be
9656 a procedure. Exception: Procedure Pointers. */
9657 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9659 gfc_error ("External object '%s' at %L may not have an initializer",
9660 sym->name, &sym->declared_at);
9664 /* An elemental function is required to return a scalar 12.7.1 */
9665 if (sym->attr.elemental && sym->attr.function && sym->as)
9667 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9668 "result", sym->name, &sym->declared_at);
9669 /* Reset so that the error only occurs once. */
9670 sym->attr.elemental = 0;
9674 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9675 char-len-param shall not be array-valued, pointer-valued, recursive
9676 or pure. ....snip... A character value of * may only be used in the
9677 following ways: (i) Dummy arg of procedure - dummy associates with
9678 actual length; (ii) To declare a named constant; or (iii) External
9679 function - but length must be declared in calling scoping unit. */
9680 if (sym->attr.function
9681 && sym->ts.type == BT_CHARACTER
9682 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9684 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9685 || (sym->attr.recursive) || (sym->attr.pure))
9687 if (sym->as && sym->as->rank)
9688 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9689 "array-valued", sym->name, &sym->declared_at);
9691 if (sym->attr.pointer)
9692 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9693 "pointer-valued", sym->name, &sym->declared_at);
9696 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9697 "pure", sym->name, &sym->declared_at);
9699 if (sym->attr.recursive)
9700 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9701 "recursive", sym->name, &sym->declared_at);
9706 /* Appendix B.2 of the standard. Contained functions give an
9707 error anyway. Fixed-form is likely to be F77/legacy. */
9708 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9709 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9710 "CHARACTER(*) function '%s' at %L",
9711 sym->name, &sym->declared_at);
9714 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9716 gfc_formal_arglist *curr_arg;
9717 int has_non_interop_arg = 0;
9719 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9720 sym->common_block) == FAILURE)
9722 /* Clear these to prevent looking at them again if there was an
9724 sym->attr.is_bind_c = 0;
9725 sym->attr.is_c_interop = 0;
9726 sym->ts.is_c_interop = 0;
9730 /* So far, no errors have been found. */
9731 sym->attr.is_c_interop = 1;
9732 sym->ts.is_c_interop = 1;
9735 curr_arg = sym->formal;
9736 while (curr_arg != NULL)
9738 /* Skip implicitly typed dummy args here. */
9739 if (curr_arg->sym->attr.implicit_type == 0)
9740 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9741 /* If something is found to fail, record the fact so we
9742 can mark the symbol for the procedure as not being
9743 BIND(C) to try and prevent multiple errors being
9745 has_non_interop_arg = 1;
9747 curr_arg = curr_arg->next;
9750 /* See if any of the arguments were not interoperable and if so, clear
9751 the procedure symbol to prevent duplicate error messages. */
9752 if (has_non_interop_arg != 0)
9754 sym->attr.is_c_interop = 0;
9755 sym->ts.is_c_interop = 0;
9756 sym->attr.is_bind_c = 0;
9760 if (!sym->attr.proc_pointer)
9762 if (sym->attr.save == SAVE_EXPLICIT)
9764 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9765 "in '%s' at %L", sym->name, &sym->declared_at);
9768 if (sym->attr.intent)
9770 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9771 "in '%s' at %L", sym->name, &sym->declared_at);
9774 if (sym->attr.subroutine && sym->attr.result)
9776 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9777 "in '%s' at %L", sym->name, &sym->declared_at);
9780 if (sym->attr.external && sym->attr.function
9781 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9782 || sym->attr.contained))
9784 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9785 "in '%s' at %L", sym->name, &sym->declared_at);
9788 if (strcmp ("ppr@", sym->name) == 0)
9790 gfc_error ("Procedure pointer result '%s' at %L "
9791 "is missing the pointer attribute",
9792 sym->ns->proc_name->name, &sym->declared_at);
9801 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9802 been defined and we now know their defined arguments, check that they fulfill
9803 the requirements of the standard for procedures used as finalizers. */
9806 gfc_resolve_finalizers (gfc_symbol* derived)
9808 gfc_finalizer* list;
9809 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9810 gfc_try result = SUCCESS;
9811 bool seen_scalar = false;
9813 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9816 /* Walk over the list of finalizer-procedures, check them, and if any one
9817 does not fit in with the standard's definition, print an error and remove
9818 it from the list. */
9819 prev_link = &derived->f2k_derived->finalizers;
9820 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9826 /* Skip this finalizer if we already resolved it. */
9827 if (list->proc_tree)
9829 prev_link = &(list->next);
9833 /* Check this exists and is a SUBROUTINE. */
9834 if (!list->proc_sym->attr.subroutine)
9836 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9837 list->proc_sym->name, &list->where);
9841 /* We should have exactly one argument. */
9842 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9844 gfc_error ("FINAL procedure at %L must have exactly one argument",
9848 arg = list->proc_sym->formal->sym;
9850 /* This argument must be of our type. */
9851 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9853 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9854 &arg->declared_at, derived->name);
9858 /* It must neither be a pointer nor allocatable nor optional. */
9859 if (arg->attr.pointer)
9861 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9865 if (arg->attr.allocatable)
9867 gfc_error ("Argument of FINAL procedure at %L must not be"
9868 " ALLOCATABLE", &arg->declared_at);
9871 if (arg->attr.optional)
9873 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9878 /* It must not be INTENT(OUT). */
9879 if (arg->attr.intent == INTENT_OUT)
9881 gfc_error ("Argument of FINAL procedure at %L must not be"
9882 " INTENT(OUT)", &arg->declared_at);
9886 /* Warn if the procedure is non-scalar and not assumed shape. */
9887 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9888 && arg->as->type != AS_ASSUMED_SHAPE)
9889 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9890 " shape argument", &arg->declared_at);
9892 /* Check that it does not match in kind and rank with a FINAL procedure
9893 defined earlier. To really loop over the *earlier* declarations,
9894 we need to walk the tail of the list as new ones were pushed at the
9896 /* TODO: Handle kind parameters once they are implemented. */
9897 my_rank = (arg->as ? arg->as->rank : 0);
9898 for (i = list->next; i; i = i->next)
9900 /* Argument list might be empty; that is an error signalled earlier,
9901 but we nevertheless continued resolving. */
9902 if (i->proc_sym->formal)
9904 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9905 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9906 if (i_rank == my_rank)
9908 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9909 " rank (%d) as '%s'",
9910 list->proc_sym->name, &list->where, my_rank,
9917 /* Is this the/a scalar finalizer procedure? */
9918 if (!arg->as || arg->as->rank == 0)
9921 /* Find the symtree for this procedure. */
9922 gcc_assert (!list->proc_tree);
9923 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9925 prev_link = &list->next;
9928 /* Remove wrong nodes immediately from the list so we don't risk any
9929 troubles in the future when they might fail later expectations. */
9933 *prev_link = list->next;
9934 gfc_free_finalizer (i);
9937 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9938 were nodes in the list, must have been for arrays. It is surely a good
9939 idea to have a scalar version there if there's something to finalize. */
9940 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9941 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9942 " defined at %L, suggest also scalar one",
9943 derived->name, &derived->declared_at);
9945 /* TODO: Remove this error when finalization is finished. */
9946 gfc_error ("Finalization at %L is not yet implemented",
9947 &derived->declared_at);
9953 /* Check that it is ok for the typebound procedure proc to override the
9957 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9960 const gfc_symbol* proc_target;
9961 const gfc_symbol* old_target;
9962 unsigned proc_pass_arg, old_pass_arg, argpos;
9963 gfc_formal_arglist* proc_formal;
9964 gfc_formal_arglist* old_formal;
9966 /* This procedure should only be called for non-GENERIC proc. */
9967 gcc_assert (!proc->n.tb->is_generic);
9969 /* If the overwritten procedure is GENERIC, this is an error. */
9970 if (old->n.tb->is_generic)
9972 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9973 old->name, &proc->n.tb->where);
9977 where = proc->n.tb->where;
9978 proc_target = proc->n.tb->u.specific->n.sym;
9979 old_target = old->n.tb->u.specific->n.sym;
9981 /* Check that overridden binding is not NON_OVERRIDABLE. */
9982 if (old->n.tb->non_overridable)
9984 gfc_error ("'%s' at %L overrides a procedure binding declared"
9985 " NON_OVERRIDABLE", proc->name, &where);
9989 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9990 if (!old->n.tb->deferred && proc->n.tb->deferred)
9992 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9993 " non-DEFERRED binding", proc->name, &where);
9997 /* If the overridden binding is PURE, the overriding must be, too. */
9998 if (old_target->attr.pure && !proc_target->attr.pure)
10000 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
10001 proc->name, &where);
10005 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
10006 is not, the overriding must not be either. */
10007 if (old_target->attr.elemental && !proc_target->attr.elemental)
10009 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
10010 " ELEMENTAL", proc->name, &where);
10013 if (!old_target->attr.elemental && proc_target->attr.elemental)
10015 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
10016 " be ELEMENTAL, either", proc->name, &where);
10020 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
10022 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
10024 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
10025 " SUBROUTINE", proc->name, &where);
10029 /* If the overridden binding is a FUNCTION, the overriding must also be a
10030 FUNCTION and have the same characteristics. */
10031 if (old_target->attr.function)
10033 if (!proc_target->attr.function)
10035 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
10036 " FUNCTION", proc->name, &where);
10040 /* FIXME: Do more comprehensive checking (including, for instance, the
10041 rank and array-shape). */
10042 gcc_assert (proc_target->result && old_target->result);
10043 if (!gfc_compare_types (&proc_target->result->ts,
10044 &old_target->result->ts))
10046 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
10047 " matching result types", proc->name, &where);
10052 /* If the overridden binding is PUBLIC, the overriding one must not be
10054 if (old->n.tb->access == ACCESS_PUBLIC
10055 && proc->n.tb->access == ACCESS_PRIVATE)
10057 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
10058 " PRIVATE", proc->name, &where);
10062 /* Compare the formal argument lists of both procedures. This is also abused
10063 to find the position of the passed-object dummy arguments of both
10064 bindings as at least the overridden one might not yet be resolved and we
10065 need those positions in the check below. */
10066 proc_pass_arg = old_pass_arg = 0;
10067 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
10069 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
10072 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
10073 proc_formal && old_formal;
10074 proc_formal = proc_formal->next, old_formal = old_formal->next)
10076 if (proc->n.tb->pass_arg
10077 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
10078 proc_pass_arg = argpos;
10079 if (old->n.tb->pass_arg
10080 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
10081 old_pass_arg = argpos;
10083 /* Check that the names correspond. */
10084 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
10086 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
10087 " to match the corresponding argument of the overridden"
10088 " procedure", proc_formal->sym->name, proc->name, &where,
10089 old_formal->sym->name);
10093 /* Check that the types correspond if neither is the passed-object
10095 /* FIXME: Do more comprehensive testing here. */
10096 if (proc_pass_arg != argpos && old_pass_arg != argpos
10097 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10099 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10100 "in respect to the overridden procedure",
10101 proc_formal->sym->name, proc->name, &where);
10107 if (proc_formal || old_formal)
10109 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10110 " the overridden procedure", proc->name, &where);
10114 /* If the overridden binding is NOPASS, the overriding one must also be
10116 if (old->n.tb->nopass && !proc->n.tb->nopass)
10118 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10119 " NOPASS", proc->name, &where);
10123 /* If the overridden binding is PASS(x), the overriding one must also be
10124 PASS and the passed-object dummy arguments must correspond. */
10125 if (!old->n.tb->nopass)
10127 if (proc->n.tb->nopass)
10129 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10130 " PASS", proc->name, &where);
10134 if (proc_pass_arg != old_pass_arg)
10136 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10137 " the same position as the passed-object dummy argument of"
10138 " the overridden procedure", proc->name, &where);
10147 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10150 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10151 const char* generic_name, locus where)
10156 gcc_assert (t1->specific && t2->specific);
10157 gcc_assert (!t1->specific->is_generic);
10158 gcc_assert (!t2->specific->is_generic);
10160 sym1 = t1->specific->u.specific->n.sym;
10161 sym2 = t2->specific->u.specific->n.sym;
10166 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10167 if (sym1->attr.subroutine != sym2->attr.subroutine
10168 || sym1->attr.function != sym2->attr.function)
10170 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10171 " GENERIC '%s' at %L",
10172 sym1->name, sym2->name, generic_name, &where);
10176 /* Compare the interfaces. */
10177 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10179 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10180 sym1->name, sym2->name, generic_name, &where);
10188 /* Worker function for resolving a generic procedure binding; this is used to
10189 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10191 The difference between those cases is finding possible inherited bindings
10192 that are overridden, as one has to look for them in tb_sym_root,
10193 tb_uop_root or tb_op, respectively. Thus the caller must already find
10194 the super-type and set p->overridden correctly. */
10197 resolve_tb_generic_targets (gfc_symbol* super_type,
10198 gfc_typebound_proc* p, const char* name)
10200 gfc_tbp_generic* target;
10201 gfc_symtree* first_target;
10202 gfc_symtree* inherited;
10204 gcc_assert (p && p->is_generic);
10206 /* Try to find the specific bindings for the symtrees in our target-list. */
10207 gcc_assert (p->u.generic);
10208 for (target = p->u.generic; target; target = target->next)
10209 if (!target->specific)
10211 gfc_typebound_proc* overridden_tbp;
10212 gfc_tbp_generic* g;
10213 const char* target_name;
10215 target_name = target->specific_st->name;
10217 /* Defined for this type directly. */
10218 if (target->specific_st->n.tb)
10220 target->specific = target->specific_st->n.tb;
10221 goto specific_found;
10224 /* Look for an inherited specific binding. */
10227 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10232 gcc_assert (inherited->n.tb);
10233 target->specific = inherited->n.tb;
10234 goto specific_found;
10238 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10239 " at %L", target_name, name, &p->where);
10242 /* Once we've found the specific binding, check it is not ambiguous with
10243 other specifics already found or inherited for the same GENERIC. */
10245 gcc_assert (target->specific);
10247 /* This must really be a specific binding! */
10248 if (target->specific->is_generic)
10250 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10251 " '%s' is GENERIC, too", name, &p->where, target_name);
10255 /* Check those already resolved on this type directly. */
10256 for (g = p->u.generic; g; g = g->next)
10257 if (g != target && g->specific
10258 && check_generic_tbp_ambiguity (target, g, name, p->where)
10262 /* Check for ambiguity with inherited specific targets. */
10263 for (overridden_tbp = p->overridden; overridden_tbp;
10264 overridden_tbp = overridden_tbp->overridden)
10265 if (overridden_tbp->is_generic)
10267 for (g = overridden_tbp->u.generic; g; g = g->next)
10269 gcc_assert (g->specific);
10270 if (check_generic_tbp_ambiguity (target, g,
10271 name, p->where) == FAILURE)
10277 /* If we attempt to "overwrite" a specific binding, this is an error. */
10278 if (p->overridden && !p->overridden->is_generic)
10280 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10281 " the same name", name, &p->where);
10285 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10286 all must have the same attributes here. */
10287 first_target = p->u.generic->specific->u.specific;
10288 gcc_assert (first_target);
10289 p->subroutine = first_target->n.sym->attr.subroutine;
10290 p->function = first_target->n.sym->attr.function;
10296 /* Resolve a GENERIC procedure binding for a derived type. */
10299 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10301 gfc_symbol* super_type;
10303 /* Find the overridden binding if any. */
10304 st->n.tb->overridden = NULL;
10305 super_type = gfc_get_derived_super_type (derived);
10308 gfc_symtree* overridden;
10309 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10312 if (overridden && overridden->n.tb)
10313 st->n.tb->overridden = overridden->n.tb;
10316 /* Resolve using worker function. */
10317 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10321 /* Retrieve the target-procedure of an operator binding and do some checks in
10322 common for intrinsic and user-defined type-bound operators. */
10325 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10327 gfc_symbol* target_proc;
10329 gcc_assert (target->specific && !target->specific->is_generic);
10330 target_proc = target->specific->u.specific->n.sym;
10331 gcc_assert (target_proc);
10333 /* All operator bindings must have a passed-object dummy argument. */
10334 if (target->specific->nopass)
10336 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10340 return target_proc;
10344 /* Resolve a type-bound intrinsic operator. */
10347 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10348 gfc_typebound_proc* p)
10350 gfc_symbol* super_type;
10351 gfc_tbp_generic* target;
10353 /* If there's already an error here, do nothing (but don't fail again). */
10357 /* Operators should always be GENERIC bindings. */
10358 gcc_assert (p->is_generic);
10360 /* Look for an overridden binding. */
10361 super_type = gfc_get_derived_super_type (derived);
10362 if (super_type && super_type->f2k_derived)
10363 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10366 p->overridden = NULL;
10368 /* Resolve general GENERIC properties using worker function. */
10369 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10372 /* Check the targets to be procedures of correct interface. */
10373 for (target = p->u.generic; target; target = target->next)
10375 gfc_symbol* target_proc;
10377 target_proc = get_checked_tb_operator_target (target, p->where);
10381 if (!gfc_check_operator_interface (target_proc, op, p->where))
10393 /* Resolve a type-bound user operator (tree-walker callback). */
10395 static gfc_symbol* resolve_bindings_derived;
10396 static gfc_try resolve_bindings_result;
10398 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10401 resolve_typebound_user_op (gfc_symtree* stree)
10403 gfc_symbol* super_type;
10404 gfc_tbp_generic* target;
10406 gcc_assert (stree && stree->n.tb);
10408 if (stree->n.tb->error)
10411 /* Operators should always be GENERIC bindings. */
10412 gcc_assert (stree->n.tb->is_generic);
10414 /* Find overridden procedure, if any. */
10415 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10416 if (super_type && super_type->f2k_derived)
10418 gfc_symtree* overridden;
10419 overridden = gfc_find_typebound_user_op (super_type, NULL,
10420 stree->name, true, NULL);
10422 if (overridden && overridden->n.tb)
10423 stree->n.tb->overridden = overridden->n.tb;
10426 stree->n.tb->overridden = NULL;
10428 /* Resolve basically using worker function. */
10429 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10433 /* Check the targets to be functions of correct interface. */
10434 for (target = stree->n.tb->u.generic; target; target = target->next)
10436 gfc_symbol* target_proc;
10438 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10442 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10449 resolve_bindings_result = FAILURE;
10450 stree->n.tb->error = 1;
10454 /* Resolve the type-bound procedures for a derived type. */
10457 resolve_typebound_procedure (gfc_symtree* stree)
10461 gfc_symbol* me_arg;
10462 gfc_symbol* super_type;
10463 gfc_component* comp;
10465 gcc_assert (stree);
10467 /* Undefined specific symbol from GENERIC target definition. */
10471 if (stree->n.tb->error)
10474 /* If this is a GENERIC binding, use that routine. */
10475 if (stree->n.tb->is_generic)
10477 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10483 /* Get the target-procedure to check it. */
10484 gcc_assert (!stree->n.tb->is_generic);
10485 gcc_assert (stree->n.tb->u.specific);
10486 proc = stree->n.tb->u.specific->n.sym;
10487 where = stree->n.tb->where;
10489 /* Default access should already be resolved from the parser. */
10490 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10492 /* It should be a module procedure or an external procedure with explicit
10493 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10494 if ((!proc->attr.subroutine && !proc->attr.function)
10495 || (proc->attr.proc != PROC_MODULE
10496 && proc->attr.if_source != IFSRC_IFBODY)
10497 || (proc->attr.abstract && !stree->n.tb->deferred))
10499 gfc_error ("'%s' must be a module procedure or an external procedure with"
10500 " an explicit interface at %L", proc->name, &where);
10503 stree->n.tb->subroutine = proc->attr.subroutine;
10504 stree->n.tb->function = proc->attr.function;
10506 /* Find the super-type of the current derived type. We could do this once and
10507 store in a global if speed is needed, but as long as not I believe this is
10508 more readable and clearer. */
10509 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10511 /* If PASS, resolve and check arguments if not already resolved / loaded
10512 from a .mod file. */
10513 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10515 if (stree->n.tb->pass_arg)
10517 gfc_formal_arglist* i;
10519 /* If an explicit passing argument name is given, walk the arg-list
10520 and look for it. */
10523 stree->n.tb->pass_arg_num = 1;
10524 for (i = proc->formal; i; i = i->next)
10526 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10531 ++stree->n.tb->pass_arg_num;
10536 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10538 proc->name, stree->n.tb->pass_arg, &where,
10539 stree->n.tb->pass_arg);
10545 /* Otherwise, take the first one; there should in fact be at least
10547 stree->n.tb->pass_arg_num = 1;
10550 gfc_error ("Procedure '%s' with PASS at %L must have at"
10551 " least one argument", proc->name, &where);
10554 me_arg = proc->formal->sym;
10557 /* Now check that the argument-type matches and the passed-object
10558 dummy argument is generally fine. */
10560 gcc_assert (me_arg);
10562 if (me_arg->ts.type != BT_CLASS)
10564 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10565 " at %L", proc->name, &where);
10569 if (CLASS_DATA (me_arg)->ts.u.derived
10570 != resolve_bindings_derived)
10572 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10573 " the derived-type '%s'", me_arg->name, proc->name,
10574 me_arg->name, &where, resolve_bindings_derived->name);
10578 gcc_assert (me_arg->ts.type == BT_CLASS);
10579 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
10581 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10582 " scalar", proc->name, &where);
10585 if (CLASS_DATA (me_arg)->attr.allocatable)
10587 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10588 " be ALLOCATABLE", proc->name, &where);
10591 if (CLASS_DATA (me_arg)->attr.class_pointer)
10593 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10594 " be POINTER", proc->name, &where);
10599 /* If we are extending some type, check that we don't override a procedure
10600 flagged NON_OVERRIDABLE. */
10601 stree->n.tb->overridden = NULL;
10604 gfc_symtree* overridden;
10605 overridden = gfc_find_typebound_proc (super_type, NULL,
10606 stree->name, true, NULL);
10608 if (overridden && overridden->n.tb)
10609 stree->n.tb->overridden = overridden->n.tb;
10611 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10615 /* See if there's a name collision with a component directly in this type. */
10616 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10617 if (!strcmp (comp->name, stree->name))
10619 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10621 stree->name, &where, resolve_bindings_derived->name);
10625 /* Try to find a name collision with an inherited component. */
10626 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10628 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10629 " component of '%s'",
10630 stree->name, &where, resolve_bindings_derived->name);
10634 stree->n.tb->error = 0;
10638 resolve_bindings_result = FAILURE;
10639 stree->n.tb->error = 1;
10643 resolve_typebound_procedures (gfc_symbol* derived)
10647 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10650 resolve_bindings_derived = derived;
10651 resolve_bindings_result = SUCCESS;
10653 if (derived->f2k_derived->tb_sym_root)
10654 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10655 &resolve_typebound_procedure);
10657 if (derived->f2k_derived->tb_uop_root)
10658 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10659 &resolve_typebound_user_op);
10661 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10663 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10664 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10666 resolve_bindings_result = FAILURE;
10669 return resolve_bindings_result;
10673 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10674 to give all identical derived types the same backend_decl. */
10676 add_dt_to_dt_list (gfc_symbol *derived)
10678 gfc_dt_list *dt_list;
10680 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10681 if (derived == dt_list->derived)
10684 if (dt_list == NULL)
10686 dt_list = gfc_get_dt_list ();
10687 dt_list->next = gfc_derived_types;
10688 dt_list->derived = derived;
10689 gfc_derived_types = dt_list;
10694 /* Ensure that a derived-type is really not abstract, meaning that every
10695 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10698 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10703 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10705 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10708 if (st->n.tb && st->n.tb->deferred)
10710 gfc_symtree* overriding;
10711 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10714 gcc_assert (overriding->n.tb);
10715 if (overriding->n.tb->deferred)
10717 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10718 " '%s' is DEFERRED and not overridden",
10719 sub->name, &sub->declared_at, st->name);
10728 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10730 /* The algorithm used here is to recursively travel up the ancestry of sub
10731 and for each ancestor-type, check all bindings. If any of them is
10732 DEFERRED, look it up starting from sub and see if the found (overriding)
10733 binding is not DEFERRED.
10734 This is not the most efficient way to do this, but it should be ok and is
10735 clearer than something sophisticated. */
10737 gcc_assert (ancestor && !sub->attr.abstract);
10739 if (!ancestor->attr.abstract)
10742 /* Walk bindings of this ancestor. */
10743 if (ancestor->f2k_derived)
10746 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10751 /* Find next ancestor type and recurse on it. */
10752 ancestor = gfc_get_derived_super_type (ancestor);
10754 return ensure_not_abstract (sub, ancestor);
10760 static void resolve_symbol (gfc_symbol *sym);
10763 /* Resolve the components of a derived type. */
10766 resolve_fl_derived (gfc_symbol *sym)
10768 gfc_symbol* super_type;
10772 super_type = gfc_get_derived_super_type (sym);
10774 if (sym->attr.is_class && sym->ts.u.derived == NULL)
10776 /* Fix up incomplete CLASS symbols. */
10777 gfc_component *data = gfc_find_component (sym, "$data", true, true);
10778 gfc_component *vptr = gfc_find_component (sym, "$vptr", true, true);
10779 if (vptr->ts.u.derived == NULL)
10781 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived, false);
10783 vptr->ts.u.derived = vtab->ts.u.derived;
10788 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10790 gfc_error ("As extending type '%s' at %L has a coarray component, "
10791 "parent type '%s' shall also have one", sym->name,
10792 &sym->declared_at, super_type->name);
10796 /* Ensure the extended type gets resolved before we do. */
10797 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10800 /* An ABSTRACT type must be extensible. */
10801 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10803 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10804 sym->name, &sym->declared_at);
10808 for (c = sym->components; c != NULL; c = c->next)
10811 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10812 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10814 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10815 "deferred shape", c->name, &c->loc);
10820 if (c->attr.codimension && c->ts.type == BT_DERIVED
10821 && c->ts.u.derived->ts.is_iso_c)
10823 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10824 "shall not be a coarray", c->name, &c->loc);
10829 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10830 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10831 || c->attr.allocatable))
10833 gfc_error ("Component '%s' at %L with coarray component "
10834 "shall be a nonpointer, nonallocatable scalar",
10840 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
10842 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
10843 "is not an array pointer", c->name, &c->loc);
10847 if (c->attr.proc_pointer && c->ts.interface)
10849 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
10850 gfc_error ("Interface '%s', used by procedure pointer component "
10851 "'%s' at %L, is declared in a later PROCEDURE statement",
10852 c->ts.interface->name, c->name, &c->loc);
10854 /* Get the attributes from the interface (now resolved). */
10855 if (c->ts.interface->attr.if_source
10856 || c->ts.interface->attr.intrinsic)
10858 gfc_symbol *ifc = c->ts.interface;
10860 if (ifc->formal && !ifc->formal_ns)
10861 resolve_symbol (ifc);
10863 if (ifc->attr.intrinsic)
10864 resolve_intrinsic (ifc, &ifc->declared_at);
10868 c->ts = ifc->result->ts;
10869 c->attr.allocatable = ifc->result->attr.allocatable;
10870 c->attr.pointer = ifc->result->attr.pointer;
10871 c->attr.dimension = ifc->result->attr.dimension;
10872 c->as = gfc_copy_array_spec (ifc->result->as);
10877 c->attr.allocatable = ifc->attr.allocatable;
10878 c->attr.pointer = ifc->attr.pointer;
10879 c->attr.dimension = ifc->attr.dimension;
10880 c->as = gfc_copy_array_spec (ifc->as);
10882 c->ts.interface = ifc;
10883 c->attr.function = ifc->attr.function;
10884 c->attr.subroutine = ifc->attr.subroutine;
10885 gfc_copy_formal_args_ppc (c, ifc);
10887 c->attr.pure = ifc->attr.pure;
10888 c->attr.elemental = ifc->attr.elemental;
10889 c->attr.recursive = ifc->attr.recursive;
10890 c->attr.always_explicit = ifc->attr.always_explicit;
10891 c->attr.ext_attr |= ifc->attr.ext_attr;
10892 /* Replace symbols in array spec. */
10896 for (i = 0; i < c->as->rank; i++)
10898 gfc_expr_replace_comp (c->as->lower[i], c);
10899 gfc_expr_replace_comp (c->as->upper[i], c);
10902 /* Copy char length. */
10903 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10905 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10906 gfc_expr_replace_comp (cl->length, c);
10907 if (cl->length && !cl->resolved
10908 && gfc_resolve_expr (cl->length) == FAILURE)
10913 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
10915 gfc_error ("Interface '%s' of procedure pointer component "
10916 "'%s' at %L must be explicit", c->ts.interface->name,
10921 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10923 /* Since PPCs are not implicitly typed, a PPC without an explicit
10924 interface must be a subroutine. */
10925 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10928 /* Procedure pointer components: Check PASS arg. */
10929 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
10930 && !sym->attr.vtype)
10932 gfc_symbol* me_arg;
10934 if (c->tb->pass_arg)
10936 gfc_formal_arglist* i;
10938 /* If an explicit passing argument name is given, walk the arg-list
10939 and look for it. */
10942 c->tb->pass_arg_num = 1;
10943 for (i = c->formal; i; i = i->next)
10945 if (!strcmp (i->sym->name, c->tb->pass_arg))
10950 c->tb->pass_arg_num++;
10955 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10956 "at %L has no argument '%s'", c->name,
10957 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10964 /* Otherwise, take the first one; there should in fact be at least
10966 c->tb->pass_arg_num = 1;
10969 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10970 "must have at least one argument",
10975 me_arg = c->formal->sym;
10978 /* Now check that the argument-type matches. */
10979 gcc_assert (me_arg);
10980 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10981 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10982 || (me_arg->ts.type == BT_CLASS
10983 && CLASS_DATA (me_arg)->ts.u.derived != sym))
10985 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10986 " the derived type '%s'", me_arg->name, c->name,
10987 me_arg->name, &c->loc, sym->name);
10992 /* Check for C453. */
10993 if (me_arg->attr.dimension)
10995 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10996 "must be scalar", me_arg->name, c->name, me_arg->name,
11002 if (me_arg->attr.pointer)
11004 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11005 "may not have the POINTER attribute", me_arg->name,
11006 c->name, me_arg->name, &c->loc);
11011 if (me_arg->attr.allocatable)
11013 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11014 "may not be ALLOCATABLE", me_arg->name, c->name,
11015 me_arg->name, &c->loc);
11020 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11021 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11022 " at %L", c->name, &c->loc);
11026 /* Check type-spec if this is not the parent-type component. */
11027 if ((!sym->attr.extension || c != sym->components)
11028 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11031 /* If this type is an extension, set the accessibility of the parent
11033 if (super_type && c == sym->components
11034 && strcmp (super_type->name, c->name) == 0)
11035 c->attr.access = super_type->attr.access;
11037 /* If this type is an extension, see if this component has the same name
11038 as an inherited type-bound procedure. */
11039 if (super_type && !sym->attr.is_class
11040 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11042 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11043 " inherited type-bound procedure",
11044 c->name, sym->name, &c->loc);
11048 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
11050 if (c->ts.u.cl->length == NULL
11051 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11052 || !gfc_is_constant_expr (c->ts.u.cl->length))
11054 gfc_error ("Character length of component '%s' needs to "
11055 "be a constant specification expression at %L",
11057 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11062 if (c->ts.type == BT_DERIVED
11063 && sym->component_access != ACCESS_PRIVATE
11064 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11065 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11066 && !c->ts.u.derived->attr.use_assoc
11067 && !gfc_check_access (c->ts.u.derived->attr.access,
11068 c->ts.u.derived->ns->default_access)
11069 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11070 "is a PRIVATE type and cannot be a component of "
11071 "'%s', which is PUBLIC at %L", c->name,
11072 sym->name, &sym->declared_at) == FAILURE)
11075 if (sym->attr.sequence)
11077 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11079 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11080 "not have the SEQUENCE attribute",
11081 c->ts.u.derived->name, &sym->declared_at);
11086 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && c->attr.pointer
11087 && c->ts.u.derived->components == NULL
11088 && !c->ts.u.derived->attr.zero_comp)
11090 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11091 "that has not been declared", c->name, sym->name,
11096 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.pointer
11097 && CLASS_DATA (c)->ts.u.derived->components == NULL
11098 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11100 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11101 "that has not been declared", c->name, sym->name,
11107 if (c->ts.type == BT_CLASS
11108 && !(CLASS_DATA (c)->attr.pointer || CLASS_DATA (c)->attr.allocatable))
11110 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11111 "or pointer", c->name, &c->loc);
11115 /* Ensure that all the derived type components are put on the
11116 derived type list; even in formal namespaces, where derived type
11117 pointer components might not have been declared. */
11118 if (c->ts.type == BT_DERIVED
11120 && c->ts.u.derived->components
11122 && sym != c->ts.u.derived)
11123 add_dt_to_dt_list (c->ts.u.derived);
11125 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
11129 for (i = 0; i < c->as->rank; i++)
11131 if (c->as->lower[i] == NULL
11132 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
11133 || !gfc_is_constant_expr (c->as->lower[i])
11134 || c->as->upper[i] == NULL
11135 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
11136 || !gfc_is_constant_expr (c->as->upper[i]))
11138 gfc_error ("Component '%s' of '%s' at %L must have "
11139 "constant array bounds",
11140 c->name, sym->name, &c->loc);
11146 /* Resolve the type-bound procedures. */
11147 if (resolve_typebound_procedures (sym) == FAILURE)
11150 /* Resolve the finalizer procedures. */
11151 if (gfc_resolve_finalizers (sym) == FAILURE)
11154 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11155 all DEFERRED bindings are overridden. */
11156 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11157 && !sym->attr.is_class
11158 && ensure_not_abstract (sym, super_type) == FAILURE)
11161 /* Add derived type to the derived type list. */
11162 add_dt_to_dt_list (sym);
11169 resolve_fl_namelist (gfc_symbol *sym)
11174 /* Reject PRIVATE objects in a PUBLIC namelist. */
11175 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
11177 for (nl = sym->namelist; nl; nl = nl->next)
11179 if (!nl->sym->attr.use_assoc
11180 && !is_sym_host_assoc (nl->sym, sym->ns)
11181 && !gfc_check_access(nl->sym->attr.access,
11182 nl->sym->ns->default_access))
11184 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11185 "cannot be member of PUBLIC namelist '%s' at %L",
11186 nl->sym->name, sym->name, &sym->declared_at);
11190 /* Types with private components that came here by USE-association. */
11191 if (nl->sym->ts.type == BT_DERIVED
11192 && derived_inaccessible (nl->sym->ts.u.derived))
11194 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11195 "components and cannot be member of namelist '%s' at %L",
11196 nl->sym->name, sym->name, &sym->declared_at);
11200 /* Types with private components that are defined in the same module. */
11201 if (nl->sym->ts.type == BT_DERIVED
11202 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11203 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
11204 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
11205 nl->sym->ns->default_access))
11207 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11208 "cannot be a member of PUBLIC namelist '%s' at %L",
11209 nl->sym->name, sym->name, &sym->declared_at);
11215 for (nl = sym->namelist; nl; nl = nl->next)
11217 /* Reject namelist arrays of assumed shape. */
11218 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11219 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
11220 "must not have assumed shape in namelist "
11221 "'%s' at %L", nl->sym->name, sym->name,
11222 &sym->declared_at) == FAILURE)
11225 /* Reject namelist arrays that are not constant shape. */
11226 if (is_non_constant_shape_array (nl->sym))
11228 gfc_error ("NAMELIST array object '%s' must have constant "
11229 "shape in namelist '%s' at %L", nl->sym->name,
11230 sym->name, &sym->declared_at);
11234 /* Namelist objects cannot have allocatable or pointer components. */
11235 if (nl->sym->ts.type != BT_DERIVED)
11238 if (nl->sym->ts.u.derived->attr.alloc_comp)
11240 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11241 "have ALLOCATABLE components",
11242 nl->sym->name, sym->name, &sym->declared_at);
11246 if (nl->sym->ts.u.derived->attr.pointer_comp)
11248 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11249 "have POINTER components",
11250 nl->sym->name, sym->name, &sym->declared_at);
11256 /* 14.1.2 A module or internal procedure represent local entities
11257 of the same type as a namelist member and so are not allowed. */
11258 for (nl = sym->namelist; nl; nl = nl->next)
11260 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11263 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11264 if ((nl->sym == sym->ns->proc_name)
11266 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11270 if (nl->sym && nl->sym->name)
11271 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11272 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11274 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11275 "attribute in '%s' at %L", nlsym->name,
11276 &sym->declared_at);
11286 resolve_fl_parameter (gfc_symbol *sym)
11288 /* A parameter array's shape needs to be constant. */
11289 if (sym->as != NULL
11290 && (sym->as->type == AS_DEFERRED
11291 || is_non_constant_shape_array (sym)))
11293 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11294 "or of deferred shape", sym->name, &sym->declared_at);
11298 /* Make sure a parameter that has been implicitly typed still
11299 matches the implicit type, since PARAMETER statements can precede
11300 IMPLICIT statements. */
11301 if (sym->attr.implicit_type
11302 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11305 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11306 "later IMPLICIT type", sym->name, &sym->declared_at);
11310 /* Make sure the types of derived parameters are consistent. This
11311 type checking is deferred until resolution because the type may
11312 refer to a derived type from the host. */
11313 if (sym->ts.type == BT_DERIVED
11314 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11316 gfc_error ("Incompatible derived type in PARAMETER at %L",
11317 &sym->value->where);
11324 /* Do anything necessary to resolve a symbol. Right now, we just
11325 assume that an otherwise unknown symbol is a variable. This sort
11326 of thing commonly happens for symbols in module. */
11329 resolve_symbol (gfc_symbol *sym)
11331 int check_constant, mp_flag;
11332 gfc_symtree *symtree;
11333 gfc_symtree *this_symtree;
11337 /* Avoid double resolution of function result symbols. */
11338 if ((sym->result || sym->attr.result) && (sym->ns != gfc_current_ns))
11341 if (sym->attr.flavor == FL_UNKNOWN)
11344 /* If we find that a flavorless symbol is an interface in one of the
11345 parent namespaces, find its symtree in this namespace, free the
11346 symbol and set the symtree to point to the interface symbol. */
11347 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11349 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11350 if (symtree && symtree->n.sym->generic)
11352 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11356 gfc_free_symbol (sym);
11357 symtree->n.sym->refs++;
11358 this_symtree->n.sym = symtree->n.sym;
11363 /* Otherwise give it a flavor according to such attributes as
11365 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11366 sym->attr.flavor = FL_VARIABLE;
11369 sym->attr.flavor = FL_PROCEDURE;
11370 if (sym->attr.dimension)
11371 sym->attr.function = 1;
11375 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11376 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11378 if (sym->attr.procedure && sym->ts.interface
11379 && sym->attr.if_source != IFSRC_DECL)
11381 if (sym->ts.interface == sym)
11383 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11384 "interface", sym->name, &sym->declared_at);
11387 if (sym->ts.interface->attr.procedure)
11389 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11390 " in a later PROCEDURE statement", sym->ts.interface->name,
11391 sym->name,&sym->declared_at);
11395 /* Get the attributes from the interface (now resolved). */
11396 if (sym->ts.interface->attr.if_source
11397 || sym->ts.interface->attr.intrinsic)
11399 gfc_symbol *ifc = sym->ts.interface;
11400 resolve_symbol (ifc);
11402 if (ifc->attr.intrinsic)
11403 resolve_intrinsic (ifc, &ifc->declared_at);
11406 sym->ts = ifc->result->ts;
11409 sym->ts.interface = ifc;
11410 sym->attr.function = ifc->attr.function;
11411 sym->attr.subroutine = ifc->attr.subroutine;
11412 gfc_copy_formal_args (sym, ifc);
11414 sym->attr.allocatable = ifc->attr.allocatable;
11415 sym->attr.pointer = ifc->attr.pointer;
11416 sym->attr.pure = ifc->attr.pure;
11417 sym->attr.elemental = ifc->attr.elemental;
11418 sym->attr.dimension = ifc->attr.dimension;
11419 sym->attr.contiguous = ifc->attr.contiguous;
11420 sym->attr.recursive = ifc->attr.recursive;
11421 sym->attr.always_explicit = ifc->attr.always_explicit;
11422 sym->attr.ext_attr |= ifc->attr.ext_attr;
11423 /* Copy array spec. */
11424 sym->as = gfc_copy_array_spec (ifc->as);
11428 for (i = 0; i < sym->as->rank; i++)
11430 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11431 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11434 /* Copy char length. */
11435 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11437 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11438 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11439 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
11440 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
11444 else if (sym->ts.interface->name[0] != '\0')
11446 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11447 sym->ts.interface->name, sym->name, &sym->declared_at);
11452 if (sym->attr.is_protected && !sym->attr.proc_pointer
11453 && (sym->attr.procedure || sym->attr.external))
11455 if (sym->attr.external)
11456 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11457 "at %L", &sym->declared_at);
11459 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11460 "at %L", &sym->declared_at);
11467 if (sym->attr.contiguous
11468 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
11469 && !sym->attr.pointer)))
11471 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
11472 "array pointer or an assumed-shape array", sym->name,
11473 &sym->declared_at);
11477 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11480 /* Symbols that are module procedures with results (functions) have
11481 the types and array specification copied for type checking in
11482 procedures that call them, as well as for saving to a module
11483 file. These symbols can't stand the scrutiny that their results
11485 mp_flag = (sym->result != NULL && sym->result != sym);
11487 /* Make sure that the intrinsic is consistent with its internal
11488 representation. This needs to be done before assigning a default
11489 type to avoid spurious warnings. */
11490 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11491 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11494 /* For associate names, resolve corresponding expression and make sure
11495 they get their type-spec set this way. */
11498 gcc_assert (sym->attr.flavor == FL_VARIABLE);
11499 if (gfc_resolve_expr (sym->assoc->target) != SUCCESS)
11502 sym->ts = sym->assoc->target->ts;
11503 gcc_assert (sym->ts.type != BT_UNKNOWN);
11506 /* Assign default type to symbols that need one and don't have one. */
11507 if (sym->ts.type == BT_UNKNOWN)
11509 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11510 gfc_set_default_type (sym, 1, NULL);
11512 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11513 && !sym->attr.function && !sym->attr.subroutine
11514 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11515 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11517 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11519 /* The specific case of an external procedure should emit an error
11520 in the case that there is no implicit type. */
11522 gfc_set_default_type (sym, sym->attr.external, NULL);
11525 /* Result may be in another namespace. */
11526 resolve_symbol (sym->result);
11528 if (!sym->result->attr.proc_pointer)
11530 sym->ts = sym->result->ts;
11531 sym->as = gfc_copy_array_spec (sym->result->as);
11532 sym->attr.dimension = sym->result->attr.dimension;
11533 sym->attr.pointer = sym->result->attr.pointer;
11534 sym->attr.allocatable = sym->result->attr.allocatable;
11535 sym->attr.contiguous = sym->result->attr.contiguous;
11541 /* Assumed size arrays and assumed shape arrays must be dummy
11544 if (sym->as != NULL
11545 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11546 || sym->as->type == AS_ASSUMED_SHAPE)
11547 && sym->attr.dummy == 0)
11549 if (sym->as->type == AS_ASSUMED_SIZE)
11550 gfc_error ("Assumed size array at %L must be a dummy argument",
11551 &sym->declared_at);
11553 gfc_error ("Assumed shape array at %L must be a dummy argument",
11554 &sym->declared_at);
11558 /* Make sure symbols with known intent or optional are really dummy
11559 variable. Because of ENTRY statement, this has to be deferred
11560 until resolution time. */
11562 if (!sym->attr.dummy
11563 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11565 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11569 if (sym->attr.value && !sym->attr.dummy)
11571 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11572 "it is not a dummy argument", sym->name, &sym->declared_at);
11576 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11578 gfc_charlen *cl = sym->ts.u.cl;
11579 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11581 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11582 "attribute must have constant length",
11583 sym->name, &sym->declared_at);
11587 if (sym->ts.is_c_interop
11588 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11590 gfc_error ("C interoperable character dummy variable '%s' at %L "
11591 "with VALUE attribute must have length one",
11592 sym->name, &sym->declared_at);
11597 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11598 do this for something that was implicitly typed because that is handled
11599 in gfc_set_default_type. Handle dummy arguments and procedure
11600 definitions separately. Also, anything that is use associated is not
11601 handled here but instead is handled in the module it is declared in.
11602 Finally, derived type definitions are allowed to be BIND(C) since that
11603 only implies that they're interoperable, and they are checked fully for
11604 interoperability when a variable is declared of that type. */
11605 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11606 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11607 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11609 gfc_try t = SUCCESS;
11611 /* First, make sure the variable is declared at the
11612 module-level scope (J3/04-007, Section 15.3). */
11613 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11614 sym->attr.in_common == 0)
11616 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11617 "is neither a COMMON block nor declared at the "
11618 "module level scope", sym->name, &(sym->declared_at));
11621 else if (sym->common_head != NULL)
11623 t = verify_com_block_vars_c_interop (sym->common_head);
11627 /* If type() declaration, we need to verify that the components
11628 of the given type are all C interoperable, etc. */
11629 if (sym->ts.type == BT_DERIVED &&
11630 sym->ts.u.derived->attr.is_c_interop != 1)
11632 /* Make sure the user marked the derived type as BIND(C). If
11633 not, call the verify routine. This could print an error
11634 for the derived type more than once if multiple variables
11635 of that type are declared. */
11636 if (sym->ts.u.derived->attr.is_bind_c != 1)
11637 verify_bind_c_derived_type (sym->ts.u.derived);
11641 /* Verify the variable itself as C interoperable if it
11642 is BIND(C). It is not possible for this to succeed if
11643 the verify_bind_c_derived_type failed, so don't have to handle
11644 any error returned by verify_bind_c_derived_type. */
11645 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11646 sym->common_block);
11651 /* clear the is_bind_c flag to prevent reporting errors more than
11652 once if something failed. */
11653 sym->attr.is_bind_c = 0;
11658 /* If a derived type symbol has reached this point, without its
11659 type being declared, we have an error. Notice that most
11660 conditions that produce undefined derived types have already
11661 been dealt with. However, the likes of:
11662 implicit type(t) (t) ..... call foo (t) will get us here if
11663 the type is not declared in the scope of the implicit
11664 statement. Change the type to BT_UNKNOWN, both because it is so
11665 and to prevent an ICE. */
11666 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11667 && !sym->ts.u.derived->attr.zero_comp)
11669 gfc_error ("The derived type '%s' at %L is of type '%s', "
11670 "which has not been defined", sym->name,
11671 &sym->declared_at, sym->ts.u.derived->name);
11672 sym->ts.type = BT_UNKNOWN;
11676 /* Make sure that the derived type has been resolved and that the
11677 derived type is visible in the symbol's namespace, if it is a
11678 module function and is not PRIVATE. */
11679 if (sym->ts.type == BT_DERIVED
11680 && sym->ts.u.derived->attr.use_assoc
11681 && sym->ns->proc_name
11682 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11686 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11689 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11690 if (!ds && sym->attr.function
11691 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11693 symtree = gfc_new_symtree (&sym->ns->sym_root,
11694 sym->ts.u.derived->name);
11695 symtree->n.sym = sym->ts.u.derived;
11696 sym->ts.u.derived->refs++;
11700 /* Unless the derived-type declaration is use associated, Fortran 95
11701 does not allow public entries of private derived types.
11702 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11703 161 in 95-006r3. */
11704 if (sym->ts.type == BT_DERIVED
11705 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11706 && !sym->ts.u.derived->attr.use_assoc
11707 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11708 && !gfc_check_access (sym->ts.u.derived->attr.access,
11709 sym->ts.u.derived->ns->default_access)
11710 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11711 "of PRIVATE derived type '%s'",
11712 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11713 : "variable", sym->name, &sym->declared_at,
11714 sym->ts.u.derived->name) == FAILURE)
11717 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11718 default initialization is defined (5.1.2.4.4). */
11719 if (sym->ts.type == BT_DERIVED
11721 && sym->attr.intent == INTENT_OUT
11723 && sym->as->type == AS_ASSUMED_SIZE)
11725 for (c = sym->ts.u.derived->components; c; c = c->next)
11727 if (c->initializer)
11729 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11730 "ASSUMED SIZE and so cannot have a default initializer",
11731 sym->name, &sym->declared_at);
11738 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11739 || sym->attr.codimension)
11740 && sym->attr.result)
11741 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11742 "a coarray component", sym->name, &sym->declared_at);
11745 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11746 && sym->ts.u.derived->ts.is_iso_c)
11747 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11748 "shall not be a coarray", sym->name, &sym->declared_at);
11751 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11752 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11753 || sym->attr.allocatable))
11754 gfc_error ("Variable '%s' at %L with coarray component "
11755 "shall be a nonpointer, nonallocatable scalar",
11756 sym->name, &sym->declared_at);
11758 /* F2008, C526. The function-result case was handled above. */
11759 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11760 || sym->attr.codimension)
11761 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11762 || sym->ns->proc_name->attr.flavor == FL_MODULE
11763 || sym->ns->proc_name->attr.is_main_program
11764 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11765 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11766 "component and is not ALLOCATABLE, SAVE nor a "
11767 "dummy argument", sym->name, &sym->declared_at);
11768 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11769 else if (sym->attr.codimension && !sym->attr.allocatable
11770 && sym->as && sym->as->cotype == AS_DEFERRED)
11771 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11772 "deferred shape", sym->name, &sym->declared_at);
11773 else if (sym->attr.codimension && sym->attr.allocatable
11774 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11775 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11776 "deferred shape", sym->name, &sym->declared_at);
11780 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11781 || (sym->attr.codimension && sym->attr.allocatable))
11782 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11783 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11784 "allocatable coarray or have coarray components",
11785 sym->name, &sym->declared_at);
11787 if (sym->attr.codimension && sym->attr.dummy
11788 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11789 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11790 "procedure '%s'", sym->name, &sym->declared_at,
11791 sym->ns->proc_name->name);
11793 switch (sym->attr.flavor)
11796 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11801 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11806 if (resolve_fl_namelist (sym) == FAILURE)
11811 if (resolve_fl_parameter (sym) == FAILURE)
11819 /* Resolve array specifier. Check as well some constraints
11820 on COMMON blocks. */
11822 check_constant = sym->attr.in_common && !sym->attr.pointer;
11824 /* Set the formal_arg_flag so that check_conflict will not throw
11825 an error for host associated variables in the specification
11826 expression for an array_valued function. */
11827 if (sym->attr.function && sym->as)
11828 formal_arg_flag = 1;
11830 gfc_resolve_array_spec (sym->as, check_constant);
11832 formal_arg_flag = 0;
11834 /* Resolve formal namespaces. */
11835 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11836 && !sym->attr.contained && !sym->attr.intrinsic)
11837 gfc_resolve (sym->formal_ns);
11839 /* Make sure the formal namespace is present. */
11840 if (sym->formal && !sym->formal_ns)
11842 gfc_formal_arglist *formal = sym->formal;
11843 while (formal && !formal->sym)
11844 formal = formal->next;
11848 sym->formal_ns = formal->sym->ns;
11849 sym->formal_ns->refs++;
11853 /* Check threadprivate restrictions. */
11854 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11855 && (!sym->attr.in_common
11856 && sym->module == NULL
11857 && (sym->ns->proc_name == NULL
11858 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11859 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11861 /* If we have come this far we can apply default-initializers, as
11862 described in 14.7.5, to those variables that have not already
11863 been assigned one. */
11864 if (sym->ts.type == BT_DERIVED
11865 && sym->attr.referenced
11866 && sym->ns == gfc_current_ns
11868 && !sym->attr.allocatable
11869 && !sym->attr.alloc_comp)
11871 symbol_attribute *a = &sym->attr;
11873 if ((!a->save && !a->dummy && !a->pointer
11874 && !a->in_common && !a->use_assoc
11875 && !(a->function && sym != sym->result))
11876 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11877 apply_default_init (sym);
11880 /* If this symbol has a type-spec, check it. */
11881 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11882 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11883 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11889 /************* Resolve DATA statements *************/
11893 gfc_data_value *vnode;
11899 /* Advance the values structure to point to the next value in the data list. */
11902 next_data_value (void)
11904 while (mpz_cmp_ui (values.left, 0) == 0)
11907 if (values.vnode->next == NULL)
11910 values.vnode = values.vnode->next;
11911 mpz_set (values.left, values.vnode->repeat);
11919 check_data_variable (gfc_data_variable *var, locus *where)
11925 ar_type mark = AR_UNKNOWN;
11927 mpz_t section_index[GFC_MAX_DIMENSIONS];
11933 if (gfc_resolve_expr (var->expr) == FAILURE)
11937 mpz_init_set_si (offset, 0);
11940 if (e->expr_type != EXPR_VARIABLE)
11941 gfc_internal_error ("check_data_variable(): Bad expression");
11943 sym = e->symtree->n.sym;
11945 if (sym->ns->is_block_data && !sym->attr.in_common)
11947 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11948 sym->name, &sym->declared_at);
11951 if (e->ref == NULL && sym->as)
11953 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11954 " declaration", sym->name, where);
11958 has_pointer = sym->attr.pointer;
11960 for (ref = e->ref; ref; ref = ref->next)
11962 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11965 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11967 gfc_error ("DATA element '%s' at %L cannot have a coindex",
11973 && ref->type == REF_ARRAY
11974 && ref->u.ar.type != AR_FULL)
11976 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11977 "be a full array", sym->name, where);
11982 if (e->rank == 0 || has_pointer)
11984 mpz_init_set_ui (size, 1);
11991 /* Find the array section reference. */
11992 for (ref = e->ref; ref; ref = ref->next)
11994 if (ref->type != REF_ARRAY)
11996 if (ref->u.ar.type == AR_ELEMENT)
12002 /* Set marks according to the reference pattern. */
12003 switch (ref->u.ar.type)
12011 /* Get the start position of array section. */
12012 gfc_get_section_index (ar, section_index, &offset);
12017 gcc_unreachable ();
12020 if (gfc_array_size (e, &size) == FAILURE)
12022 gfc_error ("Nonconstant array section at %L in DATA statement",
12024 mpz_clear (offset);
12031 while (mpz_cmp_ui (size, 0) > 0)
12033 if (next_data_value () == FAILURE)
12035 gfc_error ("DATA statement at %L has more variables than values",
12041 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12045 /* If we have more than one element left in the repeat count,
12046 and we have more than one element left in the target variable,
12047 then create a range assignment. */
12048 /* FIXME: Only done for full arrays for now, since array sections
12050 if (mark == AR_FULL && ref && ref->next == NULL
12051 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12055 if (mpz_cmp (size, values.left) >= 0)
12057 mpz_init_set (range, values.left);
12058 mpz_sub (size, size, values.left);
12059 mpz_set_ui (values.left, 0);
12063 mpz_init_set (range, size);
12064 mpz_sub (values.left, values.left, size);
12065 mpz_set_ui (size, 0);
12068 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
12071 mpz_add (offset, offset, range);
12078 /* Assign initial value to symbol. */
12081 mpz_sub_ui (values.left, values.left, 1);
12082 mpz_sub_ui (size, size, 1);
12084 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
12088 if (mark == AR_FULL)
12089 mpz_add_ui (offset, offset, 1);
12091 /* Modify the array section indexes and recalculate the offset
12092 for next element. */
12093 else if (mark == AR_SECTION)
12094 gfc_advance_section (section_index, ar, &offset);
12098 if (mark == AR_SECTION)
12100 for (i = 0; i < ar->dimen; i++)
12101 mpz_clear (section_index[i]);
12105 mpz_clear (offset);
12111 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12113 /* Iterate over a list of elements in a DATA statement. */
12116 traverse_data_list (gfc_data_variable *var, locus *where)
12119 iterator_stack frame;
12120 gfc_expr *e, *start, *end, *step;
12121 gfc_try retval = SUCCESS;
12123 mpz_init (frame.value);
12126 start = gfc_copy_expr (var->iter.start);
12127 end = gfc_copy_expr (var->iter.end);
12128 step = gfc_copy_expr (var->iter.step);
12130 if (gfc_simplify_expr (start, 1) == FAILURE
12131 || start->expr_type != EXPR_CONSTANT)
12133 gfc_error ("start of implied-do loop at %L could not be "
12134 "simplified to a constant value", &start->where);
12138 if (gfc_simplify_expr (end, 1) == FAILURE
12139 || end->expr_type != EXPR_CONSTANT)
12141 gfc_error ("end of implied-do loop at %L could not be "
12142 "simplified to a constant value", &start->where);
12146 if (gfc_simplify_expr (step, 1) == FAILURE
12147 || step->expr_type != EXPR_CONSTANT)
12149 gfc_error ("step of implied-do loop at %L could not be "
12150 "simplified to a constant value", &start->where);
12155 mpz_set (trip, end->value.integer);
12156 mpz_sub (trip, trip, start->value.integer);
12157 mpz_add (trip, trip, step->value.integer);
12159 mpz_div (trip, trip, step->value.integer);
12161 mpz_set (frame.value, start->value.integer);
12163 frame.prev = iter_stack;
12164 frame.variable = var->iter.var->symtree;
12165 iter_stack = &frame;
12167 while (mpz_cmp_ui (trip, 0) > 0)
12169 if (traverse_data_var (var->list, where) == FAILURE)
12175 e = gfc_copy_expr (var->expr);
12176 if (gfc_simplify_expr (e, 1) == FAILURE)
12183 mpz_add (frame.value, frame.value, step->value.integer);
12185 mpz_sub_ui (trip, trip, 1);
12189 mpz_clear (frame.value);
12192 gfc_free_expr (start);
12193 gfc_free_expr (end);
12194 gfc_free_expr (step);
12196 iter_stack = frame.prev;
12201 /* Type resolve variables in the variable list of a DATA statement. */
12204 traverse_data_var (gfc_data_variable *var, locus *where)
12208 for (; var; var = var->next)
12210 if (var->expr == NULL)
12211 t = traverse_data_list (var, where);
12213 t = check_data_variable (var, where);
12223 /* Resolve the expressions and iterators associated with a data statement.
12224 This is separate from the assignment checking because data lists should
12225 only be resolved once. */
12228 resolve_data_variables (gfc_data_variable *d)
12230 for (; d; d = d->next)
12232 if (d->list == NULL)
12234 if (gfc_resolve_expr (d->expr) == FAILURE)
12239 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12242 if (resolve_data_variables (d->list) == FAILURE)
12251 /* Resolve a single DATA statement. We implement this by storing a pointer to
12252 the value list into static variables, and then recursively traversing the
12253 variables list, expanding iterators and such. */
12256 resolve_data (gfc_data *d)
12259 if (resolve_data_variables (d->var) == FAILURE)
12262 values.vnode = d->value;
12263 if (d->value == NULL)
12264 mpz_set_ui (values.left, 0);
12266 mpz_set (values.left, d->value->repeat);
12268 if (traverse_data_var (d->var, &d->where) == FAILURE)
12271 /* At this point, we better not have any values left. */
12273 if (next_data_value () == SUCCESS)
12274 gfc_error ("DATA statement at %L has more values than variables",
12279 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12280 accessed by host or use association, is a dummy argument to a pure function,
12281 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12282 is storage associated with any such variable, shall not be used in the
12283 following contexts: (clients of this function). */
12285 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12286 procedure. Returns zero if assignment is OK, nonzero if there is a
12289 gfc_impure_variable (gfc_symbol *sym)
12294 if (sym->attr.use_assoc || sym->attr.in_common)
12297 /* Check if the symbol's ns is inside the pure procedure. */
12298 for (ns = gfc_current_ns; ns; ns = ns->parent)
12302 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12306 proc = sym->ns->proc_name;
12307 if (sym->attr.dummy && gfc_pure (proc)
12308 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12310 proc->attr.function))
12313 /* TODO: Sort out what can be storage associated, if anything, and include
12314 it here. In principle equivalences should be scanned but it does not
12315 seem to be possible to storage associate an impure variable this way. */
12320 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12321 current namespace is inside a pure procedure. */
12324 gfc_pure (gfc_symbol *sym)
12326 symbol_attribute attr;
12331 /* Check if the current namespace or one of its parents
12332 belongs to a pure procedure. */
12333 for (ns = gfc_current_ns; ns; ns = ns->parent)
12335 sym = ns->proc_name;
12339 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12347 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12351 /* Test whether the current procedure is elemental or not. */
12354 gfc_elemental (gfc_symbol *sym)
12356 symbol_attribute attr;
12359 sym = gfc_current_ns->proc_name;
12364 return attr.flavor == FL_PROCEDURE && attr.elemental;
12368 /* Warn about unused labels. */
12371 warn_unused_fortran_label (gfc_st_label *label)
12376 warn_unused_fortran_label (label->left);
12378 if (label->defined == ST_LABEL_UNKNOWN)
12381 switch (label->referenced)
12383 case ST_LABEL_UNKNOWN:
12384 gfc_warning ("Label %d at %L defined but not used", label->value,
12388 case ST_LABEL_BAD_TARGET:
12389 gfc_warning ("Label %d at %L defined but cannot be used",
12390 label->value, &label->where);
12397 warn_unused_fortran_label (label->right);
12401 /* Returns the sequence type of a symbol or sequence. */
12404 sequence_type (gfc_typespec ts)
12413 if (ts.u.derived->components == NULL)
12414 return SEQ_NONDEFAULT;
12416 result = sequence_type (ts.u.derived->components->ts);
12417 for (c = ts.u.derived->components->next; c; c = c->next)
12418 if (sequence_type (c->ts) != result)
12424 if (ts.kind != gfc_default_character_kind)
12425 return SEQ_NONDEFAULT;
12427 return SEQ_CHARACTER;
12430 if (ts.kind != gfc_default_integer_kind)
12431 return SEQ_NONDEFAULT;
12433 return SEQ_NUMERIC;
12436 if (!(ts.kind == gfc_default_real_kind
12437 || ts.kind == gfc_default_double_kind))
12438 return SEQ_NONDEFAULT;
12440 return SEQ_NUMERIC;
12443 if (ts.kind != gfc_default_complex_kind)
12444 return SEQ_NONDEFAULT;
12446 return SEQ_NUMERIC;
12449 if (ts.kind != gfc_default_logical_kind)
12450 return SEQ_NONDEFAULT;
12452 return SEQ_NUMERIC;
12455 return SEQ_NONDEFAULT;
12460 /* Resolve derived type EQUIVALENCE object. */
12463 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12465 gfc_component *c = derived->components;
12470 /* Shall not be an object of nonsequence derived type. */
12471 if (!derived->attr.sequence)
12473 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12474 "attribute to be an EQUIVALENCE object", sym->name,
12479 /* Shall not have allocatable components. */
12480 if (derived->attr.alloc_comp)
12482 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12483 "components to be an EQUIVALENCE object",sym->name,
12488 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
12490 gfc_error ("Derived type variable '%s' at %L with default "
12491 "initialization cannot be in EQUIVALENCE with a variable "
12492 "in COMMON", sym->name, &e->where);
12496 for (; c ; c = c->next)
12498 if (c->ts.type == BT_DERIVED
12499 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12502 /* Shall not be an object of sequence derived type containing a pointer
12503 in the structure. */
12504 if (c->attr.pointer)
12506 gfc_error ("Derived type variable '%s' at %L with pointer "
12507 "component(s) cannot be an EQUIVALENCE object",
12508 sym->name, &e->where);
12516 /* Resolve equivalence object.
12517 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12518 an allocatable array, an object of nonsequence derived type, an object of
12519 sequence derived type containing a pointer at any level of component
12520 selection, an automatic object, a function name, an entry name, a result
12521 name, a named constant, a structure component, or a subobject of any of
12522 the preceding objects. A substring shall not have length zero. A
12523 derived type shall not have components with default initialization nor
12524 shall two objects of an equivalence group be initialized.
12525 Either all or none of the objects shall have an protected attribute.
12526 The simple constraints are done in symbol.c(check_conflict) and the rest
12527 are implemented here. */
12530 resolve_equivalence (gfc_equiv *eq)
12533 gfc_symbol *first_sym;
12536 locus *last_where = NULL;
12537 seq_type eq_type, last_eq_type;
12538 gfc_typespec *last_ts;
12539 int object, cnt_protected;
12542 last_ts = &eq->expr->symtree->n.sym->ts;
12544 first_sym = eq->expr->symtree->n.sym;
12548 for (object = 1; eq; eq = eq->eq, object++)
12552 e->ts = e->symtree->n.sym->ts;
12553 /* match_varspec might not know yet if it is seeing
12554 array reference or substring reference, as it doesn't
12556 if (e->ref && e->ref->type == REF_ARRAY)
12558 gfc_ref *ref = e->ref;
12559 sym = e->symtree->n.sym;
12561 if (sym->attr.dimension)
12563 ref->u.ar.as = sym->as;
12567 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12568 if (e->ts.type == BT_CHARACTER
12570 && ref->type == REF_ARRAY
12571 && ref->u.ar.dimen == 1
12572 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12573 && ref->u.ar.stride[0] == NULL)
12575 gfc_expr *start = ref->u.ar.start[0];
12576 gfc_expr *end = ref->u.ar.end[0];
12579 /* Optimize away the (:) reference. */
12580 if (start == NULL && end == NULL)
12583 e->ref = ref->next;
12585 e->ref->next = ref->next;
12590 ref->type = REF_SUBSTRING;
12592 start = gfc_get_int_expr (gfc_default_integer_kind,
12594 ref->u.ss.start = start;
12595 if (end == NULL && e->ts.u.cl)
12596 end = gfc_copy_expr (e->ts.u.cl->length);
12597 ref->u.ss.end = end;
12598 ref->u.ss.length = e->ts.u.cl;
12605 /* Any further ref is an error. */
12608 gcc_assert (ref->type == REF_ARRAY);
12609 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12615 if (gfc_resolve_expr (e) == FAILURE)
12618 sym = e->symtree->n.sym;
12620 if (sym->attr.is_protected)
12622 if (cnt_protected > 0 && cnt_protected != object)
12624 gfc_error ("Either all or none of the objects in the "
12625 "EQUIVALENCE set at %L shall have the "
12626 "PROTECTED attribute",
12631 /* Shall not equivalence common block variables in a PURE procedure. */
12632 if (sym->ns->proc_name
12633 && sym->ns->proc_name->attr.pure
12634 && sym->attr.in_common)
12636 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12637 "object in the pure procedure '%s'",
12638 sym->name, &e->where, sym->ns->proc_name->name);
12642 /* Shall not be a named constant. */
12643 if (e->expr_type == EXPR_CONSTANT)
12645 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12646 "object", sym->name, &e->where);
12650 if (e->ts.type == BT_DERIVED
12651 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12654 /* Check that the types correspond correctly:
12656 A numeric sequence structure may be equivalenced to another sequence
12657 structure, an object of default integer type, default real type, double
12658 precision real type, default logical type such that components of the
12659 structure ultimately only become associated to objects of the same
12660 kind. A character sequence structure may be equivalenced to an object
12661 of default character kind or another character sequence structure.
12662 Other objects may be equivalenced only to objects of the same type and
12663 kind parameters. */
12665 /* Identical types are unconditionally OK. */
12666 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12667 goto identical_types;
12669 last_eq_type = sequence_type (*last_ts);
12670 eq_type = sequence_type (sym->ts);
12672 /* Since the pair of objects is not of the same type, mixed or
12673 non-default sequences can be rejected. */
12675 msg = "Sequence %s with mixed components in EQUIVALENCE "
12676 "statement at %L with different type objects";
12678 && last_eq_type == SEQ_MIXED
12679 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12681 || (eq_type == SEQ_MIXED
12682 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12683 &e->where) == FAILURE))
12686 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12687 "statement at %L with objects of different type";
12689 && last_eq_type == SEQ_NONDEFAULT
12690 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12691 last_where) == FAILURE)
12692 || (eq_type == SEQ_NONDEFAULT
12693 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12694 &e->where) == FAILURE))
12697 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12698 "EQUIVALENCE statement at %L";
12699 if (last_eq_type == SEQ_CHARACTER
12700 && eq_type != SEQ_CHARACTER
12701 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12702 &e->where) == FAILURE)
12705 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12706 "EQUIVALENCE statement at %L";
12707 if (last_eq_type == SEQ_NUMERIC
12708 && eq_type != SEQ_NUMERIC
12709 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12710 &e->where) == FAILURE)
12715 last_where = &e->where;
12720 /* Shall not be an automatic array. */
12721 if (e->ref->type == REF_ARRAY
12722 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12724 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12725 "an EQUIVALENCE object", sym->name, &e->where);
12732 /* Shall not be a structure component. */
12733 if (r->type == REF_COMPONENT)
12735 gfc_error ("Structure component '%s' at %L cannot be an "
12736 "EQUIVALENCE object",
12737 r->u.c.component->name, &e->where);
12741 /* A substring shall not have length zero. */
12742 if (r->type == REF_SUBSTRING)
12744 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12746 gfc_error ("Substring at %L has length zero",
12747 &r->u.ss.start->where);
12757 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12760 resolve_fntype (gfc_namespace *ns)
12762 gfc_entry_list *el;
12765 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12768 /* If there are any entries, ns->proc_name is the entry master
12769 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12771 sym = ns->entries->sym;
12773 sym = ns->proc_name;
12774 if (sym->result == sym
12775 && sym->ts.type == BT_UNKNOWN
12776 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12777 && !sym->attr.untyped)
12779 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12780 sym->name, &sym->declared_at);
12781 sym->attr.untyped = 1;
12784 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12785 && !sym->attr.contained
12786 && !gfc_check_access (sym->ts.u.derived->attr.access,
12787 sym->ts.u.derived->ns->default_access)
12788 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12790 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12791 "%L of PRIVATE type '%s'", sym->name,
12792 &sym->declared_at, sym->ts.u.derived->name);
12796 for (el = ns->entries->next; el; el = el->next)
12798 if (el->sym->result == el->sym
12799 && el->sym->ts.type == BT_UNKNOWN
12800 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12801 && !el->sym->attr.untyped)
12803 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12804 el->sym->name, &el->sym->declared_at);
12805 el->sym->attr.untyped = 1;
12811 /* 12.3.2.1.1 Defined operators. */
12814 check_uop_procedure (gfc_symbol *sym, locus where)
12816 gfc_formal_arglist *formal;
12818 if (!sym->attr.function)
12820 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12821 sym->name, &where);
12825 if (sym->ts.type == BT_CHARACTER
12826 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12827 && !(sym->result && sym->result->ts.u.cl
12828 && sym->result->ts.u.cl->length))
12830 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12831 "character length", sym->name, &where);
12835 formal = sym->formal;
12836 if (!formal || !formal->sym)
12838 gfc_error ("User operator procedure '%s' at %L must have at least "
12839 "one argument", sym->name, &where);
12843 if (formal->sym->attr.intent != INTENT_IN)
12845 gfc_error ("First argument of operator interface at %L must be "
12846 "INTENT(IN)", &where);
12850 if (formal->sym->attr.optional)
12852 gfc_error ("First argument of operator interface at %L cannot be "
12853 "optional", &where);
12857 formal = formal->next;
12858 if (!formal || !formal->sym)
12861 if (formal->sym->attr.intent != INTENT_IN)
12863 gfc_error ("Second argument of operator interface at %L must be "
12864 "INTENT(IN)", &where);
12868 if (formal->sym->attr.optional)
12870 gfc_error ("Second argument of operator interface at %L cannot be "
12871 "optional", &where);
12877 gfc_error ("Operator interface at %L must have, at most, two "
12878 "arguments", &where);
12886 gfc_resolve_uops (gfc_symtree *symtree)
12888 gfc_interface *itr;
12890 if (symtree == NULL)
12893 gfc_resolve_uops (symtree->left);
12894 gfc_resolve_uops (symtree->right);
12896 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12897 check_uop_procedure (itr->sym, itr->sym->declared_at);
12901 /* Examine all of the expressions associated with a program unit,
12902 assign types to all intermediate expressions, make sure that all
12903 assignments are to compatible types and figure out which names
12904 refer to which functions or subroutines. It doesn't check code
12905 block, which is handled by resolve_code. */
12908 resolve_types (gfc_namespace *ns)
12914 gfc_namespace* old_ns = gfc_current_ns;
12916 /* Check that all IMPLICIT types are ok. */
12917 if (!ns->seen_implicit_none)
12920 for (letter = 0; letter != GFC_LETTERS; ++letter)
12921 if (ns->set_flag[letter]
12922 && resolve_typespec_used (&ns->default_type[letter],
12923 &ns->implicit_loc[letter],
12928 gfc_current_ns = ns;
12930 resolve_entries (ns);
12932 resolve_common_vars (ns->blank_common.head, false);
12933 resolve_common_blocks (ns->common_root);
12935 resolve_contained_functions (ns);
12937 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12939 for (cl = ns->cl_list; cl; cl = cl->next)
12940 resolve_charlen (cl);
12942 gfc_traverse_ns (ns, resolve_symbol);
12944 resolve_fntype (ns);
12946 for (n = ns->contained; n; n = n->sibling)
12948 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12949 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12950 "also be PURE", n->proc_name->name,
12951 &n->proc_name->declared_at);
12957 gfc_check_interfaces (ns);
12959 gfc_traverse_ns (ns, resolve_values);
12965 for (d = ns->data; d; d = d->next)
12969 gfc_traverse_ns (ns, gfc_formalize_init_value);
12971 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12973 if (ns->common_root != NULL)
12974 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12976 for (eq = ns->equiv; eq; eq = eq->next)
12977 resolve_equivalence (eq);
12979 /* Warn about unused labels. */
12980 if (warn_unused_label)
12981 warn_unused_fortran_label (ns->st_labels);
12983 gfc_resolve_uops (ns->uop_root);
12985 gfc_current_ns = old_ns;
12989 /* Call resolve_code recursively. */
12992 resolve_codes (gfc_namespace *ns)
12995 bitmap_obstack old_obstack;
12997 for (n = ns->contained; n; n = n->sibling)
13000 gfc_current_ns = ns;
13002 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13003 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13006 /* Set to an out of range value. */
13007 current_entry_id = -1;
13009 old_obstack = labels_obstack;
13010 bitmap_obstack_initialize (&labels_obstack);
13012 resolve_code (ns->code, ns);
13014 bitmap_obstack_release (&labels_obstack);
13015 labels_obstack = old_obstack;
13019 /* This function is called after a complete program unit has been compiled.
13020 Its purpose is to examine all of the expressions associated with a program
13021 unit, assign types to all intermediate expressions, make sure that all
13022 assignments are to compatible types and figure out which names refer to
13023 which functions or subroutines. */
13026 gfc_resolve (gfc_namespace *ns)
13028 gfc_namespace *old_ns;
13029 code_stack *old_cs_base;
13035 old_ns = gfc_current_ns;
13036 old_cs_base = cs_base;
13038 resolve_types (ns);
13039 resolve_codes (ns);
13041 gfc_current_ns = old_ns;
13042 cs_base = old_cs_base;