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.use_assoc
2270 /* Figure out if a function reference is pure or not. Also set the name
2271 of the function for a potential error message. Return nonzero if the
2272 function is PURE, zero if not. */
2274 pure_stmt_function (gfc_expr *, gfc_symbol *);
2277 pure_function (gfc_expr *e, const char **name)
2283 if (e->symtree != NULL
2284 && e->symtree->n.sym != NULL
2285 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2286 return pure_stmt_function (e, e->symtree->n.sym);
2288 if (e->value.function.esym)
2290 pure = gfc_pure (e->value.function.esym);
2291 *name = e->value.function.esym->name;
2293 else if (e->value.function.isym)
2295 pure = e->value.function.isym->pure
2296 || e->value.function.isym->elemental;
2297 *name = e->value.function.isym->name;
2301 /* Implicit functions are not pure. */
2303 *name = e->value.function.name;
2311 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2312 int *f ATTRIBUTE_UNUSED)
2316 /* Don't bother recursing into other statement functions
2317 since they will be checked individually for purity. */
2318 if (e->expr_type != EXPR_FUNCTION
2320 || e->symtree->n.sym == sym
2321 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2324 return pure_function (e, &name) ? false : true;
2329 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2331 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2336 is_scalar_expr_ptr (gfc_expr *expr)
2338 gfc_try retval = SUCCESS;
2343 /* See if we have a gfc_ref, which means we have a substring, array
2344 reference, or a component. */
2345 if (expr->ref != NULL)
2348 while (ref->next != NULL)
2354 if (ref->u.ss.length != NULL
2355 && ref->u.ss.length->length != NULL
2357 && ref->u.ss.start->expr_type == EXPR_CONSTANT
2359 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
2361 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
2362 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
2363 if (end - start + 1 != 1)
2370 if (ref->u.ar.type == AR_ELEMENT)
2372 else if (ref->u.ar.type == AR_FULL)
2374 /* The user can give a full array if the array is of size 1. */
2375 if (ref->u.ar.as != NULL
2376 && ref->u.ar.as->rank == 1
2377 && ref->u.ar.as->type == AS_EXPLICIT
2378 && ref->u.ar.as->lower[0] != NULL
2379 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2380 && ref->u.ar.as->upper[0] != NULL
2381 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2383 /* If we have a character string, we need to check if
2384 its length is one. */
2385 if (expr->ts.type == BT_CHARACTER)
2387 if (expr->ts.u.cl == NULL
2388 || expr->ts.u.cl->length == NULL
2389 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2395 /* We have constant lower and upper bounds. If the
2396 difference between is 1, it can be considered a
2398 start = (int) mpz_get_si
2399 (ref->u.ar.as->lower[0]->value.integer);
2400 end = (int) mpz_get_si
2401 (ref->u.ar.as->upper[0]->value.integer);
2402 if (end - start + 1 != 1)
2417 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2419 /* Character string. Make sure it's of length 1. */
2420 if (expr->ts.u.cl == NULL
2421 || expr->ts.u.cl->length == NULL
2422 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2425 else if (expr->rank != 0)
2432 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2433 and, in the case of c_associated, set the binding label based on
2437 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2438 gfc_symbol **new_sym)
2440 char name[GFC_MAX_SYMBOL_LEN + 1];
2441 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2442 int optional_arg = 0, is_pointer = 0;
2443 gfc_try retval = SUCCESS;
2444 gfc_symbol *args_sym;
2445 gfc_typespec *arg_ts;
2447 if (args->expr->expr_type == EXPR_CONSTANT
2448 || args->expr->expr_type == EXPR_OP
2449 || args->expr->expr_type == EXPR_NULL)
2451 gfc_error ("Argument to '%s' at %L is not a variable",
2452 sym->name, &(args->expr->where));
2456 args_sym = args->expr->symtree->n.sym;
2458 /* The typespec for the actual arg should be that stored in the expr
2459 and not necessarily that of the expr symbol (args_sym), because
2460 the actual expression could be a part-ref of the expr symbol. */
2461 arg_ts = &(args->expr->ts);
2463 is_pointer = gfc_is_data_pointer (args->expr);
2465 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2467 /* If the user gave two args then they are providing something for
2468 the optional arg (the second cptr). Therefore, set the name and
2469 binding label to the c_associated for two cptrs. Otherwise,
2470 set c_associated to expect one cptr. */
2474 sprintf (name, "%s_2", sym->name);
2475 sprintf (binding_label, "%s_2", sym->binding_label);
2481 sprintf (name, "%s_1", sym->name);
2482 sprintf (binding_label, "%s_1", sym->binding_label);
2486 /* Get a new symbol for the version of c_associated that
2488 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2490 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2491 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2493 sprintf (name, "%s", sym->name);
2494 sprintf (binding_label, "%s", sym->binding_label);
2496 /* Error check the call. */
2497 if (args->next != NULL)
2499 gfc_error_now ("More actual than formal arguments in '%s' "
2500 "call at %L", name, &(args->expr->where));
2503 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2505 /* Make sure we have either the target or pointer attribute. */
2506 if (!args_sym->attr.target && !is_pointer)
2508 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2509 "a TARGET or an associated pointer",
2511 sym->name, &(args->expr->where));
2515 /* See if we have interoperable type and type param. */
2516 if (verify_c_interop (arg_ts) == SUCCESS
2517 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2519 if (args_sym->attr.target == 1)
2521 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2522 has the target attribute and is interoperable. */
2523 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2524 allocatable variable that has the TARGET attribute and
2525 is not an array of zero size. */
2526 if (args_sym->attr.allocatable == 1)
2528 if (args_sym->attr.dimension != 0
2529 && (args_sym->as && args_sym->as->rank == 0))
2531 gfc_error_now ("Allocatable variable '%s' used as a "
2532 "parameter to '%s' at %L must not be "
2533 "an array of zero size",
2534 args_sym->name, sym->name,
2535 &(args->expr->where));
2541 /* A non-allocatable target variable with C
2542 interoperable type and type parameters must be
2544 if (args_sym && args_sym->attr.dimension)
2546 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2548 gfc_error ("Assumed-shape array '%s' at %L "
2549 "cannot be an argument to the "
2550 "procedure '%s' because "
2551 "it is not C interoperable",
2553 &(args->expr->where), sym->name);
2556 else if (args_sym->as->type == AS_DEFERRED)
2558 gfc_error ("Deferred-shape array '%s' at %L "
2559 "cannot be an argument to the "
2560 "procedure '%s' because "
2561 "it is not C interoperable",
2563 &(args->expr->where), sym->name);
2568 /* Make sure it's not a character string. Arrays of
2569 any type should be ok if the variable is of a C
2570 interoperable type. */
2571 if (arg_ts->type == BT_CHARACTER)
2572 if (arg_ts->u.cl != NULL
2573 && (arg_ts->u.cl->length == NULL
2574 || arg_ts->u.cl->length->expr_type
2577 (arg_ts->u.cl->length->value.integer, 1)
2579 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2581 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2582 "at %L must have a length of 1",
2583 args_sym->name, sym->name,
2584 &(args->expr->where));
2590 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2592 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2594 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2595 "associated scalar POINTER", args_sym->name,
2596 sym->name, &(args->expr->where));
2602 /* The parameter is not required to be C interoperable. If it
2603 is not C interoperable, it must be a nonpolymorphic scalar
2604 with no length type parameters. It still must have either
2605 the pointer or target attribute, and it can be
2606 allocatable (but must be allocated when c_loc is called). */
2607 if (args->expr->rank != 0
2608 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2610 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2611 "scalar", args_sym->name, sym->name,
2612 &(args->expr->where));
2615 else if (arg_ts->type == BT_CHARACTER
2616 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2618 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2619 "%L must have a length of 1",
2620 args_sym->name, sym->name,
2621 &(args->expr->where));
2626 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2628 if (args_sym->attr.flavor != FL_PROCEDURE)
2630 /* TODO: Update this error message to allow for procedure
2631 pointers once they are implemented. */
2632 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2634 args_sym->name, sym->name,
2635 &(args->expr->where));
2638 else if (args_sym->attr.is_bind_c != 1)
2640 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2642 args_sym->name, sym->name,
2643 &(args->expr->where));
2648 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2653 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2654 "iso_c_binding function: '%s'!\n", sym->name);
2661 /* Resolve a function call, which means resolving the arguments, then figuring
2662 out which entity the name refers to. */
2663 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
2664 to INTENT(OUT) or INTENT(INOUT). */
2667 resolve_function (gfc_expr *expr)
2669 gfc_actual_arglist *arg;
2674 procedure_type p = PROC_INTRINSIC;
2675 bool no_formal_args;
2679 sym = expr->symtree->n.sym;
2681 /* If this is a procedure pointer component, it has already been resolved. */
2682 if (gfc_is_proc_ptr_comp (expr, NULL))
2685 if (sym && sym->attr.intrinsic
2686 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2689 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2691 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2695 /* If this ia a deferred TBP with an abstract interface (which may
2696 of course be referenced), expr->value.function.esym will be set. */
2697 if (sym && sym->attr.abstract && !expr->value.function.esym)
2699 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2700 sym->name, &expr->where);
2704 /* Switch off assumed size checking and do this again for certain kinds
2705 of procedure, once the procedure itself is resolved. */
2706 need_full_assumed_size++;
2708 if (expr->symtree && expr->symtree->n.sym)
2709 p = expr->symtree->n.sym->attr.proc;
2711 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2712 inquiry_argument = true;
2713 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2715 if (resolve_actual_arglist (expr->value.function.actual,
2716 p, no_formal_args) == FAILURE)
2718 inquiry_argument = false;
2722 inquiry_argument = false;
2724 /* Need to setup the call to the correct c_associated, depending on
2725 the number of cptrs to user gives to compare. */
2726 if (sym && sym->attr.is_iso_c == 1)
2728 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2732 /* Get the symtree for the new symbol (resolved func).
2733 the old one will be freed later, when it's no longer used. */
2734 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2737 /* Resume assumed_size checking. */
2738 need_full_assumed_size--;
2740 /* If the procedure is external, check for usage. */
2741 if (sym && is_external_proc (sym))
2742 resolve_global_procedure (sym, &expr->where,
2743 &expr->value.function.actual, 0);
2745 if (sym && sym->ts.type == BT_CHARACTER
2747 && sym->ts.u.cl->length == NULL
2749 && expr->value.function.esym == NULL
2750 && !sym->attr.contained)
2752 /* Internal procedures are taken care of in resolve_contained_fntype. */
2753 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2754 "be used at %L since it is not a dummy argument",
2755 sym->name, &expr->where);
2759 /* See if function is already resolved. */
2761 if (expr->value.function.name != NULL)
2763 if (expr->ts.type == BT_UNKNOWN)
2769 /* Apply the rules of section 14.1.2. */
2771 switch (procedure_kind (sym))
2774 t = resolve_generic_f (expr);
2777 case PTYPE_SPECIFIC:
2778 t = resolve_specific_f (expr);
2782 t = resolve_unknown_f (expr);
2786 gfc_internal_error ("resolve_function(): bad function type");
2790 /* If the expression is still a function (it might have simplified),
2791 then we check to see if we are calling an elemental function. */
2793 if (expr->expr_type != EXPR_FUNCTION)
2796 temp = need_full_assumed_size;
2797 need_full_assumed_size = 0;
2799 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2802 if (omp_workshare_flag
2803 && expr->value.function.esym
2804 && ! gfc_elemental (expr->value.function.esym))
2806 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2807 "in WORKSHARE construct", expr->value.function.esym->name,
2812 #define GENERIC_ID expr->value.function.isym->id
2813 else if (expr->value.function.actual != NULL
2814 && expr->value.function.isym != NULL
2815 && GENERIC_ID != GFC_ISYM_LBOUND
2816 && GENERIC_ID != GFC_ISYM_LEN
2817 && GENERIC_ID != GFC_ISYM_LOC
2818 && GENERIC_ID != GFC_ISYM_PRESENT)
2820 /* Array intrinsics must also have the last upper bound of an
2821 assumed size array argument. UBOUND and SIZE have to be
2822 excluded from the check if the second argument is anything
2825 for (arg = expr->value.function.actual; arg; arg = arg->next)
2827 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
2828 && arg->next != NULL && arg->next->expr)
2830 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2833 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
2836 if ((int)mpz_get_si (arg->next->expr->value.integer)
2841 if (arg->expr != NULL
2842 && arg->expr->rank > 0
2843 && resolve_assumed_size_actual (arg->expr))
2849 need_full_assumed_size = temp;
2852 if (!pure_function (expr, &name) && name)
2856 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2857 "FORALL %s", name, &expr->where,
2858 forall_flag == 2 ? "mask" : "block");
2861 else if (gfc_pure (NULL))
2863 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2864 "procedure within a PURE procedure", name, &expr->where);
2869 /* Functions without the RECURSIVE attribution are not allowed to
2870 * call themselves. */
2871 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2874 esym = expr->value.function.esym;
2876 if (is_illegal_recursion (esym, gfc_current_ns))
2878 if (esym->attr.entry && esym->ns->entries)
2879 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
2880 " function '%s' is not RECURSIVE",
2881 esym->name, &expr->where, esym->ns->entries->sym->name);
2883 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
2884 " is not RECURSIVE", esym->name, &expr->where);
2890 /* Character lengths of use associated functions may contains references to
2891 symbols not referenced from the current program unit otherwise. Make sure
2892 those symbols are marked as referenced. */
2894 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2895 && expr->value.function.esym->attr.use_assoc)
2897 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
2901 && !((expr->value.function.esym
2902 && expr->value.function.esym->attr.elemental)
2904 (expr->value.function.isym
2905 && expr->value.function.isym->elemental)))
2906 find_noncopying_intrinsics (expr->value.function.esym,
2907 expr->value.function.actual);
2909 /* Make sure that the expression has a typespec that works. */
2910 if (expr->ts.type == BT_UNKNOWN)
2912 if (expr->symtree->n.sym->result
2913 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
2914 && !expr->symtree->n.sym->result->attr.proc_pointer)
2915 expr->ts = expr->symtree->n.sym->result->ts;
2922 /************* Subroutine resolution *************/
2925 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2931 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2932 sym->name, &c->loc);
2933 else if (gfc_pure (NULL))
2934 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2940 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2944 if (sym->attr.generic)
2946 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2949 c->resolved_sym = s;
2950 pure_subroutine (c, s);
2954 /* TODO: Need to search for elemental references in generic interface. */
2957 if (sym->attr.intrinsic)
2958 return gfc_intrinsic_sub_interface (c, 0);
2965 resolve_generic_s (gfc_code *c)
2970 sym = c->symtree->n.sym;
2974 m = resolve_generic_s0 (c, sym);
2977 else if (m == MATCH_ERROR)
2981 if (sym->ns->parent == NULL)
2983 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2987 if (!generic_sym (sym))
2991 /* Last ditch attempt. See if the reference is to an intrinsic
2992 that possesses a matching interface. 14.1.2.4 */
2993 sym = c->symtree->n.sym;
2995 if (!gfc_is_intrinsic (sym, 1, c->loc))
2997 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2998 sym->name, &c->loc);
3002 m = gfc_intrinsic_sub_interface (c, 0);
3006 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3007 "intrinsic subroutine interface", sym->name, &c->loc);
3013 /* Set the name and binding label of the subroutine symbol in the call
3014 expression represented by 'c' to include the type and kind of the
3015 second parameter. This function is for resolving the appropriate
3016 version of c_f_pointer() and c_f_procpointer(). For example, a
3017 call to c_f_pointer() for a default integer pointer could have a
3018 name of c_f_pointer_i4. If no second arg exists, which is an error
3019 for these two functions, it defaults to the generic symbol's name
3020 and binding label. */
3023 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3024 char *name, char *binding_label)
3026 gfc_expr *arg = NULL;
3030 /* The second arg of c_f_pointer and c_f_procpointer determines
3031 the type and kind for the procedure name. */
3032 arg = c->ext.actual->next->expr;
3036 /* Set up the name to have the given symbol's name,
3037 plus the type and kind. */
3038 /* a derived type is marked with the type letter 'u' */
3039 if (arg->ts.type == BT_DERIVED)
3042 kind = 0; /* set the kind as 0 for now */
3046 type = gfc_type_letter (arg->ts.type);
3047 kind = arg->ts.kind;
3050 if (arg->ts.type == BT_CHARACTER)
3051 /* Kind info for character strings not needed. */
3054 sprintf (name, "%s_%c%d", sym->name, type, kind);
3055 /* Set up the binding label as the given symbol's label plus
3056 the type and kind. */
3057 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3061 /* If the second arg is missing, set the name and label as
3062 was, cause it should at least be found, and the missing
3063 arg error will be caught by compare_parameters(). */
3064 sprintf (name, "%s", sym->name);
3065 sprintf (binding_label, "%s", sym->binding_label);
3072 /* Resolve a generic version of the iso_c_binding procedure given
3073 (sym) to the specific one based on the type and kind of the
3074 argument(s). Currently, this function resolves c_f_pointer() and
3075 c_f_procpointer based on the type and kind of the second argument
3076 (FPTR). Other iso_c_binding procedures aren't specially handled.
3077 Upon successfully exiting, c->resolved_sym will hold the resolved
3078 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3082 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3084 gfc_symbol *new_sym;
3085 /* this is fine, since we know the names won't use the max */
3086 char name[GFC_MAX_SYMBOL_LEN + 1];
3087 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3088 /* default to success; will override if find error */
3089 match m = MATCH_YES;
3091 /* Make sure the actual arguments are in the necessary order (based on the
3092 formal args) before resolving. */
3093 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3095 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3096 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3098 set_name_and_label (c, sym, name, binding_label);
3100 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3102 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3104 /* Make sure we got a third arg if the second arg has non-zero
3105 rank. We must also check that the type and rank are
3106 correct since we short-circuit this check in
3107 gfc_procedure_use() (called above to sort actual args). */
3108 if (c->ext.actual->next->expr->rank != 0)
3110 if(c->ext.actual->next->next == NULL
3111 || c->ext.actual->next->next->expr == NULL)
3114 gfc_error ("Missing SHAPE parameter for call to %s "
3115 "at %L", sym->name, &(c->loc));
3117 else if (c->ext.actual->next->next->expr->ts.type
3119 || c->ext.actual->next->next->expr->rank != 1)
3122 gfc_error ("SHAPE parameter for call to %s at %L must "
3123 "be a rank 1 INTEGER array", sym->name,
3130 if (m != MATCH_ERROR)
3132 /* the 1 means to add the optional arg to formal list */
3133 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3135 /* for error reporting, say it's declared where the original was */
3136 new_sym->declared_at = sym->declared_at;
3141 /* no differences for c_loc or c_funloc */
3145 /* set the resolved symbol */
3146 if (m != MATCH_ERROR)
3147 c->resolved_sym = new_sym;
3149 c->resolved_sym = sym;
3155 /* Resolve a subroutine call known to be specific. */
3158 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3162 if(sym->attr.is_iso_c)
3164 m = gfc_iso_c_sub_interface (c,sym);
3168 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3170 if (sym->attr.dummy)
3172 sym->attr.proc = PROC_DUMMY;
3176 sym->attr.proc = PROC_EXTERNAL;
3180 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3183 if (sym->attr.intrinsic)
3185 m = gfc_intrinsic_sub_interface (c, 1);
3189 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3190 "with an intrinsic", sym->name, &c->loc);
3198 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3200 c->resolved_sym = sym;
3201 pure_subroutine (c, sym);
3208 resolve_specific_s (gfc_code *c)
3213 sym = c->symtree->n.sym;
3217 m = resolve_specific_s0 (c, sym);
3220 if (m == MATCH_ERROR)
3223 if (sym->ns->parent == NULL)
3226 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3232 sym = c->symtree->n.sym;
3233 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3234 sym->name, &c->loc);
3240 /* Resolve a subroutine call not known to be generic nor specific. */
3243 resolve_unknown_s (gfc_code *c)
3247 sym = c->symtree->n.sym;
3249 if (sym->attr.dummy)
3251 sym->attr.proc = PROC_DUMMY;
3255 /* See if we have an intrinsic function reference. */
3257 if (gfc_is_intrinsic (sym, 1, c->loc))
3259 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3264 /* The reference is to an external name. */
3267 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3269 c->resolved_sym = sym;
3271 pure_subroutine (c, sym);
3277 /* Resolve a subroutine call. Although it was tempting to use the same code
3278 for functions, subroutines and functions are stored differently and this
3279 makes things awkward. */
3282 resolve_call (gfc_code *c)
3285 procedure_type ptype = PROC_INTRINSIC;
3286 gfc_symbol *csym, *sym;
3287 bool no_formal_args;
3289 csym = c->symtree ? c->symtree->n.sym : NULL;
3291 if (csym && csym->ts.type != BT_UNKNOWN)
3293 gfc_error ("'%s' at %L has a type, which is not consistent with "
3294 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3298 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3301 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3302 sym = st ? st->n.sym : NULL;
3303 if (sym && csym != sym
3304 && sym->ns == gfc_current_ns
3305 && sym->attr.flavor == FL_PROCEDURE
3306 && sym->attr.contained)
3309 if (csym->attr.generic)
3310 c->symtree->n.sym = sym;
3313 csym = c->symtree->n.sym;
3317 /* If this ia a deferred TBP with an abstract interface
3318 (which may of course be referenced), c->expr1 will be set. */
3319 if (csym && csym->attr.abstract && !c->expr1)
3321 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3322 csym->name, &c->loc);
3326 /* Subroutines without the RECURSIVE attribution are not allowed to
3327 * call themselves. */
3328 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3330 if (csym->attr.entry && csym->ns->entries)
3331 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3332 " subroutine '%s' is not RECURSIVE",
3333 csym->name, &c->loc, csym->ns->entries->sym->name);
3335 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3336 " is not RECURSIVE", csym->name, &c->loc);
3341 /* Switch off assumed size checking and do this again for certain kinds
3342 of procedure, once the procedure itself is resolved. */
3343 need_full_assumed_size++;
3346 ptype = csym->attr.proc;
3348 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3349 if (resolve_actual_arglist (c->ext.actual, ptype,
3350 no_formal_args) == FAILURE)
3353 /* Resume assumed_size checking. */
3354 need_full_assumed_size--;
3356 /* If external, check for usage. */
3357 if (csym && is_external_proc (csym))
3358 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3361 if (c->resolved_sym == NULL)
3363 c->resolved_isym = NULL;
3364 switch (procedure_kind (csym))
3367 t = resolve_generic_s (c);
3370 case PTYPE_SPECIFIC:
3371 t = resolve_specific_s (c);
3375 t = resolve_unknown_s (c);
3379 gfc_internal_error ("resolve_subroutine(): bad function type");
3383 /* Some checks of elemental subroutine actual arguments. */
3384 if (resolve_elemental_actual (NULL, c) == FAILURE)
3387 if (t == SUCCESS && !(c->resolved_sym && c->resolved_sym->attr.elemental))
3388 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
3393 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3394 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3395 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3396 if their shapes do not match. If either op1->shape or op2->shape is
3397 NULL, return SUCCESS. */
3400 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3407 if (op1->shape != NULL && op2->shape != NULL)
3409 for (i = 0; i < op1->rank; i++)
3411 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3413 gfc_error ("Shapes for operands at %L and %L are not conformable",
3414 &op1->where, &op2->where);
3425 /* Resolve an operator expression node. This can involve replacing the
3426 operation with a user defined function call. */
3429 resolve_operator (gfc_expr *e)
3431 gfc_expr *op1, *op2;
3433 bool dual_locus_error;
3436 /* Resolve all subnodes-- give them types. */
3438 switch (e->value.op.op)
3441 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3444 /* Fall through... */
3447 case INTRINSIC_UPLUS:
3448 case INTRINSIC_UMINUS:
3449 case INTRINSIC_PARENTHESES:
3450 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3455 /* Typecheck the new node. */
3457 op1 = e->value.op.op1;
3458 op2 = e->value.op.op2;
3459 dual_locus_error = false;
3461 if ((op1 && op1->expr_type == EXPR_NULL)
3462 || (op2 && op2->expr_type == EXPR_NULL))
3464 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3468 switch (e->value.op.op)
3470 case INTRINSIC_UPLUS:
3471 case INTRINSIC_UMINUS:
3472 if (op1->ts.type == BT_INTEGER
3473 || op1->ts.type == BT_REAL
3474 || op1->ts.type == BT_COMPLEX)
3480 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3481 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3484 case INTRINSIC_PLUS:
3485 case INTRINSIC_MINUS:
3486 case INTRINSIC_TIMES:
3487 case INTRINSIC_DIVIDE:
3488 case INTRINSIC_POWER:
3489 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3491 gfc_type_convert_binary (e, 1);
3496 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3497 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3498 gfc_typename (&op2->ts));
3501 case INTRINSIC_CONCAT:
3502 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3503 && op1->ts.kind == op2->ts.kind)
3505 e->ts.type = BT_CHARACTER;
3506 e->ts.kind = op1->ts.kind;
3511 _("Operands of string concatenation operator at %%L are %s/%s"),
3512 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3518 case INTRINSIC_NEQV:
3519 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3521 e->ts.type = BT_LOGICAL;
3522 e->ts.kind = gfc_kind_max (op1, op2);
3523 if (op1->ts.kind < e->ts.kind)
3524 gfc_convert_type (op1, &e->ts, 2);
3525 else if (op2->ts.kind < e->ts.kind)
3526 gfc_convert_type (op2, &e->ts, 2);
3530 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3531 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3532 gfc_typename (&op2->ts));
3537 if (op1->ts.type == BT_LOGICAL)
3539 e->ts.type = BT_LOGICAL;
3540 e->ts.kind = op1->ts.kind;
3544 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3545 gfc_typename (&op1->ts));
3549 case INTRINSIC_GT_OS:
3551 case INTRINSIC_GE_OS:
3553 case INTRINSIC_LT_OS:
3555 case INTRINSIC_LE_OS:
3556 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3558 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3562 /* Fall through... */
3565 case INTRINSIC_EQ_OS:
3567 case INTRINSIC_NE_OS:
3568 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3569 && op1->ts.kind == op2->ts.kind)
3571 e->ts.type = BT_LOGICAL;
3572 e->ts.kind = gfc_default_logical_kind;
3576 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3578 gfc_type_convert_binary (e, 1);
3580 e->ts.type = BT_LOGICAL;
3581 e->ts.kind = gfc_default_logical_kind;
3585 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3587 _("Logicals at %%L must be compared with %s instead of %s"),
3588 (e->value.op.op == INTRINSIC_EQ
3589 || e->value.op.op == INTRINSIC_EQ_OS)
3590 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3593 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3594 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3595 gfc_typename (&op2->ts));
3599 case INTRINSIC_USER:
3600 if (e->value.op.uop->op == NULL)
3601 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3602 else if (op2 == NULL)
3603 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3604 e->value.op.uop->name, gfc_typename (&op1->ts));
3606 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3607 e->value.op.uop->name, gfc_typename (&op1->ts),
3608 gfc_typename (&op2->ts));
3612 case INTRINSIC_PARENTHESES:
3614 if (e->ts.type == BT_CHARACTER)
3615 e->ts.u.cl = op1->ts.u.cl;
3619 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3622 /* Deal with arrayness of an operand through an operator. */
3626 switch (e->value.op.op)
3628 case INTRINSIC_PLUS:
3629 case INTRINSIC_MINUS:
3630 case INTRINSIC_TIMES:
3631 case INTRINSIC_DIVIDE:
3632 case INTRINSIC_POWER:
3633 case INTRINSIC_CONCAT:
3637 case INTRINSIC_NEQV:
3639 case INTRINSIC_EQ_OS:
3641 case INTRINSIC_NE_OS:
3643 case INTRINSIC_GT_OS:
3645 case INTRINSIC_GE_OS:
3647 case INTRINSIC_LT_OS:
3649 case INTRINSIC_LE_OS:
3651 if (op1->rank == 0 && op2->rank == 0)
3654 if (op1->rank == 0 && op2->rank != 0)
3656 e->rank = op2->rank;
3658 if (e->shape == NULL)
3659 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3662 if (op1->rank != 0 && op2->rank == 0)
3664 e->rank = op1->rank;
3666 if (e->shape == NULL)
3667 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3670 if (op1->rank != 0 && op2->rank != 0)
3672 if (op1->rank == op2->rank)
3674 e->rank = op1->rank;
3675 if (e->shape == NULL)
3677 t = compare_shapes (op1, op2);
3681 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3686 /* Allow higher level expressions to work. */
3689 /* Try user-defined operators, and otherwise throw an error. */
3690 dual_locus_error = true;
3692 _("Inconsistent ranks for operator at %%L and %%L"));
3699 case INTRINSIC_PARENTHESES:
3701 case INTRINSIC_UPLUS:
3702 case INTRINSIC_UMINUS:
3703 /* Simply copy arrayness attribute */
3704 e->rank = op1->rank;
3706 if (e->shape == NULL)
3707 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3715 /* Attempt to simplify the expression. */
3718 t = gfc_simplify_expr (e, 0);
3719 /* Some calls do not succeed in simplification and return FAILURE
3720 even though there is no error; e.g. variable references to
3721 PARAMETER arrays. */
3722 if (!gfc_is_constant_expr (e))
3731 if (gfc_extend_expr (e, &real_error) == SUCCESS)
3738 if (dual_locus_error)
3739 gfc_error (msg, &op1->where, &op2->where);
3741 gfc_error (msg, &e->where);
3747 /************** Array resolution subroutines **************/
3750 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3753 /* Compare two integer expressions. */
3756 compare_bound (gfc_expr *a, gfc_expr *b)
3760 if (a == NULL || a->expr_type != EXPR_CONSTANT
3761 || b == NULL || b->expr_type != EXPR_CONSTANT)
3764 /* If either of the types isn't INTEGER, we must have
3765 raised an error earlier. */
3767 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3770 i = mpz_cmp (a->value.integer, b->value.integer);
3780 /* Compare an integer expression with an integer. */
3783 compare_bound_int (gfc_expr *a, int b)
3787 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3790 if (a->ts.type != BT_INTEGER)
3791 gfc_internal_error ("compare_bound_int(): Bad expression");
3793 i = mpz_cmp_si (a->value.integer, b);
3803 /* Compare an integer expression with a mpz_t. */
3806 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3810 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3813 if (a->ts.type != BT_INTEGER)
3814 gfc_internal_error ("compare_bound_int(): Bad expression");
3816 i = mpz_cmp (a->value.integer, b);
3826 /* Compute the last value of a sequence given by a triplet.
3827 Return 0 if it wasn't able to compute the last value, or if the
3828 sequence if empty, and 1 otherwise. */
3831 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3832 gfc_expr *stride, mpz_t last)
3836 if (start == NULL || start->expr_type != EXPR_CONSTANT
3837 || end == NULL || end->expr_type != EXPR_CONSTANT
3838 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3841 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3842 || (stride != NULL && stride->ts.type != BT_INTEGER))
3845 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3847 if (compare_bound (start, end) == CMP_GT)
3849 mpz_set (last, end->value.integer);
3853 if (compare_bound_int (stride, 0) == CMP_GT)
3855 /* Stride is positive */
3856 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3861 /* Stride is negative */
3862 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3867 mpz_sub (rem, end->value.integer, start->value.integer);
3868 mpz_tdiv_r (rem, rem, stride->value.integer);
3869 mpz_sub (last, end->value.integer, rem);
3876 /* Compare a single dimension of an array reference to the array
3880 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3884 if (ar->dimen_type[i] == DIMEN_STAR)
3886 gcc_assert (ar->stride[i] == NULL);
3887 /* This implies [*] as [*:] and [*:3] are not possible. */
3888 if (ar->start[i] == NULL)
3890 gcc_assert (ar->end[i] == NULL);
3895 /* Given start, end and stride values, calculate the minimum and
3896 maximum referenced indexes. */
3898 switch (ar->dimen_type[i])
3905 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3908 gfc_warning ("Array reference at %L is out of bounds "
3909 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3910 mpz_get_si (ar->start[i]->value.integer),
3911 mpz_get_si (as->lower[i]->value.integer), i+1);
3913 gfc_warning ("Array reference at %L is out of bounds "
3914 "(%ld < %ld) in codimension %d", &ar->c_where[i],
3915 mpz_get_si (ar->start[i]->value.integer),
3916 mpz_get_si (as->lower[i]->value.integer),
3920 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3923 gfc_warning ("Array reference at %L is out of bounds "
3924 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3925 mpz_get_si (ar->start[i]->value.integer),
3926 mpz_get_si (as->upper[i]->value.integer), i+1);
3928 gfc_warning ("Array reference at %L is out of bounds "
3929 "(%ld > %ld) in codimension %d", &ar->c_where[i],
3930 mpz_get_si (ar->start[i]->value.integer),
3931 mpz_get_si (as->upper[i]->value.integer),
3940 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3941 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3943 comparison comp_start_end = compare_bound (AR_START, AR_END);
3945 /* Check for zero stride, which is not allowed. */
3946 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3948 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3952 /* if start == len || (stride > 0 && start < len)
3953 || (stride < 0 && start > len),
3954 then the array section contains at least one element. In this
3955 case, there is an out-of-bounds access if
3956 (start < lower || start > upper). */
3957 if (compare_bound (AR_START, AR_END) == CMP_EQ
3958 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3959 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3960 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3961 && comp_start_end == CMP_GT))
3963 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
3965 gfc_warning ("Lower array reference at %L is out of bounds "
3966 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3967 mpz_get_si (AR_START->value.integer),
3968 mpz_get_si (as->lower[i]->value.integer), i+1);
3971 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
3973 gfc_warning ("Lower array reference at %L is out of bounds "
3974 "(%ld > %ld) in dimension %d", &ar->c_where[i],
3975 mpz_get_si (AR_START->value.integer),
3976 mpz_get_si (as->upper[i]->value.integer), i+1);
3981 /* If we can compute the highest index of the array section,
3982 then it also has to be between lower and upper. */
3983 mpz_init (last_value);
3984 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3987 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
3989 gfc_warning ("Upper array reference at %L is out of bounds "
3990 "(%ld < %ld) in dimension %d", &ar->c_where[i],
3991 mpz_get_si (last_value),
3992 mpz_get_si (as->lower[i]->value.integer), i+1);
3993 mpz_clear (last_value);
3996 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3998 gfc_warning ("Upper array reference at %L is out of bounds "
3999 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4000 mpz_get_si (last_value),
4001 mpz_get_si (as->upper[i]->value.integer), i+1);
4002 mpz_clear (last_value);
4006 mpz_clear (last_value);
4014 gfc_internal_error ("check_dimension(): Bad array reference");
4021 /* Compare an array reference with an array specification. */
4024 compare_spec_to_ref (gfc_array_ref *ar)
4031 /* TODO: Full array sections are only allowed as actual parameters. */
4032 if (as->type == AS_ASSUMED_SIZE
4033 && (/*ar->type == AR_FULL
4034 ||*/ (ar->type == AR_SECTION
4035 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4037 gfc_error ("Rightmost upper bound of assumed size array section "
4038 "not specified at %L", &ar->where);
4042 if (ar->type == AR_FULL)
4045 if (as->rank != ar->dimen)
4047 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4048 &ar->where, ar->dimen, as->rank);
4052 /* ar->codimen == 0 is a local array. */
4053 if (as->corank != ar->codimen && ar->codimen != 0)
4055 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4056 &ar->where, ar->codimen, as->corank);
4060 for (i = 0; i < as->rank; i++)
4061 if (check_dimension (i, ar, as) == FAILURE)
4064 /* Local access has no coarray spec. */
4065 if (ar->codimen != 0)
4066 for (i = as->rank; i < as->rank + as->corank; i++)
4068 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate)
4070 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4071 i + 1 - as->rank, &ar->where);
4074 if (check_dimension (i, ar, as) == FAILURE)
4082 /* Resolve one part of an array index. */
4085 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4086 int force_index_integer_kind)
4093 if (gfc_resolve_expr (index) == FAILURE)
4096 if (check_scalar && index->rank != 0)
4098 gfc_error ("Array index at %L must be scalar", &index->where);
4102 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4104 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4105 &index->where, gfc_basic_typename (index->ts.type));
4109 if (index->ts.type == BT_REAL)
4110 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4111 &index->where) == FAILURE)
4114 if ((index->ts.kind != gfc_index_integer_kind
4115 && force_index_integer_kind)
4116 || index->ts.type != BT_INTEGER)
4119 ts.type = BT_INTEGER;
4120 ts.kind = gfc_index_integer_kind;
4122 gfc_convert_type_warn (index, &ts, 2, 0);
4128 /* Resolve one part of an array index. */
4131 gfc_resolve_index (gfc_expr *index, int check_scalar)
4133 return gfc_resolve_index_1 (index, check_scalar, 1);
4136 /* Resolve a dim argument to an intrinsic function. */
4139 gfc_resolve_dim_arg (gfc_expr *dim)
4144 if (gfc_resolve_expr (dim) == FAILURE)
4149 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4154 if (dim->ts.type != BT_INTEGER)
4156 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4160 if (dim->ts.kind != gfc_index_integer_kind)
4165 ts.type = BT_INTEGER;
4166 ts.kind = gfc_index_integer_kind;
4168 gfc_convert_type_warn (dim, &ts, 2, 0);
4174 /* Given an expression that contains array references, update those array
4175 references to point to the right array specifications. While this is
4176 filled in during matching, this information is difficult to save and load
4177 in a module, so we take care of it here.
4179 The idea here is that the original array reference comes from the
4180 base symbol. We traverse the list of reference structures, setting
4181 the stored reference to references. Component references can
4182 provide an additional array specification. */
4185 find_array_spec (gfc_expr *e)
4189 gfc_symbol *derived;
4192 if (e->symtree->n.sym->ts.type == BT_CLASS)
4193 as = CLASS_DATA (e->symtree->n.sym)->as;
4195 as = e->symtree->n.sym->as;
4198 for (ref = e->ref; ref; ref = ref->next)
4203 gfc_internal_error ("find_array_spec(): Missing spec");
4210 if (derived == NULL)
4211 derived = e->symtree->n.sym->ts.u.derived;
4213 if (derived->attr.is_class)
4214 derived = derived->components->ts.u.derived;
4216 c = derived->components;
4218 for (; c; c = c->next)
4219 if (c == ref->u.c.component)
4221 /* Track the sequence of component references. */
4222 if (c->ts.type == BT_DERIVED)
4223 derived = c->ts.u.derived;
4228 gfc_internal_error ("find_array_spec(): Component not found");
4230 if (c->attr.dimension)
4233 gfc_internal_error ("find_array_spec(): unused as(1)");
4244 gfc_internal_error ("find_array_spec(): unused as(2)");
4248 /* Resolve an array reference. */
4251 resolve_array_ref (gfc_array_ref *ar)
4253 int i, check_scalar;
4256 for (i = 0; i < ar->dimen + ar->codimen; i++)
4258 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4260 /* Do not force gfc_index_integer_kind for the start. We can
4261 do fine with any integer kind. This avoids temporary arrays
4262 created for indexing with a vector. */
4263 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4265 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4267 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4272 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4276 ar->dimen_type[i] = DIMEN_ELEMENT;
4280 ar->dimen_type[i] = DIMEN_VECTOR;
4281 if (e->expr_type == EXPR_VARIABLE
4282 && e->symtree->n.sym->ts.type == BT_DERIVED)
4283 ar->start[i] = gfc_get_parentheses (e);
4287 gfc_error ("Array index at %L is an array of rank %d",
4288 &ar->c_where[i], e->rank);
4293 if (ar->type == AR_FULL && ar->as->rank == 0)
4294 ar->type = AR_ELEMENT;
4296 /* If the reference type is unknown, figure out what kind it is. */
4298 if (ar->type == AR_UNKNOWN)
4300 ar->type = AR_ELEMENT;
4301 for (i = 0; i < ar->dimen; i++)
4302 if (ar->dimen_type[i] == DIMEN_RANGE
4303 || ar->dimen_type[i] == DIMEN_VECTOR)
4305 ar->type = AR_SECTION;
4310 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4318 resolve_substring (gfc_ref *ref)
4320 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4322 if (ref->u.ss.start != NULL)
4324 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4327 if (ref->u.ss.start->ts.type != BT_INTEGER)
4329 gfc_error ("Substring start index at %L must be of type INTEGER",
4330 &ref->u.ss.start->where);
4334 if (ref->u.ss.start->rank != 0)
4336 gfc_error ("Substring start index at %L must be scalar",
4337 &ref->u.ss.start->where);
4341 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4342 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4343 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4345 gfc_error ("Substring start index at %L is less than one",
4346 &ref->u.ss.start->where);
4351 if (ref->u.ss.end != NULL)
4353 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4356 if (ref->u.ss.end->ts.type != BT_INTEGER)
4358 gfc_error ("Substring end index at %L must be of type INTEGER",
4359 &ref->u.ss.end->where);
4363 if (ref->u.ss.end->rank != 0)
4365 gfc_error ("Substring end index at %L must be scalar",
4366 &ref->u.ss.end->where);
4370 if (ref->u.ss.length != NULL
4371 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4372 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4373 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4375 gfc_error ("Substring end index at %L exceeds the string length",
4376 &ref->u.ss.start->where);
4380 if (compare_bound_mpz_t (ref->u.ss.end,
4381 gfc_integer_kinds[k].huge) == CMP_GT
4382 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4383 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4385 gfc_error ("Substring end index at %L is too large",
4386 &ref->u.ss.end->where);
4395 /* This function supplies missing substring charlens. */
4398 gfc_resolve_substring_charlen (gfc_expr *e)
4401 gfc_expr *start, *end;
4403 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4404 if (char_ref->type == REF_SUBSTRING)
4410 gcc_assert (char_ref->next == NULL);
4414 if (e->ts.u.cl->length)
4415 gfc_free_expr (e->ts.u.cl->length);
4416 else if (e->expr_type == EXPR_VARIABLE
4417 && e->symtree->n.sym->attr.dummy)
4421 e->ts.type = BT_CHARACTER;
4422 e->ts.kind = gfc_default_character_kind;
4425 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4427 if (char_ref->u.ss.start)
4428 start = gfc_copy_expr (char_ref->u.ss.start);
4430 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4432 if (char_ref->u.ss.end)
4433 end = gfc_copy_expr (char_ref->u.ss.end);
4434 else if (e->expr_type == EXPR_VARIABLE)
4435 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4442 /* Length = (end - start +1). */
4443 e->ts.u.cl->length = gfc_subtract (end, start);
4444 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4445 gfc_get_int_expr (gfc_default_integer_kind,
4448 e->ts.u.cl->length->ts.type = BT_INTEGER;
4449 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4451 /* Make sure that the length is simplified. */
4452 gfc_simplify_expr (e->ts.u.cl->length, 1);
4453 gfc_resolve_expr (e->ts.u.cl->length);
4457 /* Resolve subtype references. */
4460 resolve_ref (gfc_expr *expr)
4462 int current_part_dimension, n_components, seen_part_dimension;
4465 for (ref = expr->ref; ref; ref = ref->next)
4466 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4468 find_array_spec (expr);
4472 for (ref = expr->ref; ref; ref = ref->next)
4476 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4484 resolve_substring (ref);
4488 /* Check constraints on part references. */
4490 current_part_dimension = 0;
4491 seen_part_dimension = 0;
4494 for (ref = expr->ref; ref; ref = ref->next)
4499 switch (ref->u.ar.type)
4502 /* Coarray scalar. */
4503 if (ref->u.ar.as->rank == 0)
4505 current_part_dimension = 0;
4510 current_part_dimension = 1;
4514 current_part_dimension = 0;
4518 gfc_internal_error ("resolve_ref(): Bad array reference");
4524 if (current_part_dimension || seen_part_dimension)
4527 if (ref->u.c.component->attr.pointer
4528 || ref->u.c.component->attr.proc_pointer)
4530 gfc_error ("Component to the right of a part reference "
4531 "with nonzero rank must not have the POINTER "
4532 "attribute at %L", &expr->where);
4535 else if (ref->u.c.component->attr.allocatable)
4537 gfc_error ("Component to the right of a part reference "
4538 "with nonzero rank must not have the ALLOCATABLE "
4539 "attribute at %L", &expr->where);
4551 if (((ref->type == REF_COMPONENT && n_components > 1)
4552 || ref->next == NULL)
4553 && current_part_dimension
4554 && seen_part_dimension)
4556 gfc_error ("Two or more part references with nonzero rank must "
4557 "not be specified at %L", &expr->where);
4561 if (ref->type == REF_COMPONENT)
4563 if (current_part_dimension)
4564 seen_part_dimension = 1;
4566 /* reset to make sure */
4567 current_part_dimension = 0;
4575 /* Given an expression, determine its shape. This is easier than it sounds.
4576 Leaves the shape array NULL if it is not possible to determine the shape. */
4579 expression_shape (gfc_expr *e)
4581 mpz_t array[GFC_MAX_DIMENSIONS];
4584 if (e->rank == 0 || e->shape != NULL)
4587 for (i = 0; i < e->rank; i++)
4588 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4591 e->shape = gfc_get_shape (e->rank);
4593 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4598 for (i--; i >= 0; i--)
4599 mpz_clear (array[i]);
4603 /* Given a variable expression node, compute the rank of the expression by
4604 examining the base symbol and any reference structures it may have. */
4607 expression_rank (gfc_expr *e)
4612 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4613 could lead to serious confusion... */
4614 gcc_assert (e->expr_type != EXPR_COMPCALL);
4618 if (e->expr_type == EXPR_ARRAY)
4620 /* Constructors can have a rank different from one via RESHAPE(). */
4622 if (e->symtree == NULL)
4628 e->rank = (e->symtree->n.sym->as == NULL)
4629 ? 0 : e->symtree->n.sym->as->rank;
4635 for (ref = e->ref; ref; ref = ref->next)
4637 if (ref->type != REF_ARRAY)
4640 if (ref->u.ar.type == AR_FULL)
4642 rank = ref->u.ar.as->rank;
4646 if (ref->u.ar.type == AR_SECTION)
4648 /* Figure out the rank of the section. */
4650 gfc_internal_error ("expression_rank(): Two array specs");
4652 for (i = 0; i < ref->u.ar.dimen; i++)
4653 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4654 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4664 expression_shape (e);
4668 /* Resolve a variable expression. */
4671 resolve_variable (gfc_expr *e)
4678 if (e->symtree == NULL)
4681 if (e->ref && resolve_ref (e) == FAILURE)
4684 sym = e->symtree->n.sym;
4685 if (sym->attr.flavor == FL_PROCEDURE
4686 && (!sym->attr.function
4687 || (sym->attr.function && sym->result
4688 && sym->result->attr.proc_pointer
4689 && !sym->result->attr.function)))
4691 e->ts.type = BT_PROCEDURE;
4692 goto resolve_procedure;
4695 if (sym->ts.type != BT_UNKNOWN)
4696 gfc_variable_attr (e, &e->ts);
4699 /* Must be a simple variable reference. */
4700 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
4705 if (check_assumed_size_reference (sym, e))
4708 /* Deal with forward references to entries during resolve_code, to
4709 satisfy, at least partially, 12.5.2.5. */
4710 if (gfc_current_ns->entries
4711 && current_entry_id == sym->entry_id
4714 && cs_base->current->op != EXEC_ENTRY)
4716 gfc_entry_list *entry;
4717 gfc_formal_arglist *formal;
4721 /* If the symbol is a dummy... */
4722 if (sym->attr.dummy && sym->ns == gfc_current_ns)
4724 entry = gfc_current_ns->entries;
4727 /* ...test if the symbol is a parameter of previous entries. */
4728 for (; entry && entry->id <= current_entry_id; entry = entry->next)
4729 for (formal = entry->sym->formal; formal; formal = formal->next)
4731 if (formal->sym && sym->name == formal->sym->name)
4735 /* If it has not been seen as a dummy, this is an error. */
4738 if (specification_expr)
4739 gfc_error ("Variable '%s', used in a specification expression"
4740 ", is referenced at %L before the ENTRY statement "
4741 "in which it is a parameter",
4742 sym->name, &cs_base->current->loc);
4744 gfc_error ("Variable '%s' is used at %L before the ENTRY "
4745 "statement in which it is a parameter",
4746 sym->name, &cs_base->current->loc);
4751 /* Now do the same check on the specification expressions. */
4752 specification_expr = 1;
4753 if (sym->ts.type == BT_CHARACTER
4754 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
4758 for (n = 0; n < sym->as->rank; n++)
4760 specification_expr = 1;
4761 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
4763 specification_expr = 1;
4764 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
4767 specification_expr = 0;
4770 /* Update the symbol's entry level. */
4771 sym->entry_id = current_entry_id + 1;
4775 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
4778 /* F2008, C617 and C1229. */
4779 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
4780 && gfc_is_coindexed (e))
4782 gfc_ref *ref, *ref2 = NULL;
4784 if (e->ts.type == BT_CLASS)
4786 gfc_error ("Polymorphic subobject of coindexed object at %L",
4791 for (ref = e->ref; ref; ref = ref->next)
4793 if (ref->type == REF_COMPONENT)
4795 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
4799 for ( ; ref; ref = ref->next)
4800 if (ref->type == REF_COMPONENT)
4803 /* Expression itself is coindexed object. */
4807 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
4808 for ( ; c; c = c->next)
4809 if (c->attr.allocatable && c->ts.type == BT_CLASS)
4811 gfc_error ("Coindexed object with polymorphic allocatable "
4812 "subcomponent at %L", &e->where);
4823 /* Checks to see that the correct symbol has been host associated.
4824 The only situation where this arises is that in which a twice
4825 contained function is parsed after the host association is made.
4826 Therefore, on detecting this, change the symbol in the expression
4827 and convert the array reference into an actual arglist if the old
4828 symbol is a variable. */
4830 check_host_association (gfc_expr *e)
4832 gfc_symbol *sym, *old_sym;
4836 gfc_actual_arglist *arg, *tail = NULL;
4837 bool retval = e->expr_type == EXPR_FUNCTION;
4839 /* If the expression is the result of substitution in
4840 interface.c(gfc_extend_expr) because there is no way in
4841 which the host association can be wrong. */
4842 if (e->symtree == NULL
4843 || e->symtree->n.sym == NULL
4844 || e->user_operator)
4847 old_sym = e->symtree->n.sym;
4849 if (gfc_current_ns->parent
4850 && old_sym->ns != gfc_current_ns)
4852 /* Use the 'USE' name so that renamed module symbols are
4853 correctly handled. */
4854 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
4856 if (sym && old_sym != sym
4857 && sym->ts.type == old_sym->ts.type
4858 && sym->attr.flavor == FL_PROCEDURE
4859 && sym->attr.contained)
4861 /* Clear the shape, since it might not be valid. */
4862 if (e->shape != NULL)
4864 for (n = 0; n < e->rank; n++)
4865 mpz_clear (e->shape[n]);
4867 gfc_free (e->shape);
4870 /* Give the expression the right symtree! */
4871 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
4872 gcc_assert (st != NULL);
4874 if (old_sym->attr.flavor == FL_PROCEDURE
4875 || e->expr_type == EXPR_FUNCTION)
4877 /* Original was function so point to the new symbol, since
4878 the actual argument list is already attached to the
4880 e->value.function.esym = NULL;
4885 /* Original was variable so convert array references into
4886 an actual arglist. This does not need any checking now
4887 since gfc_resolve_function will take care of it. */
4888 e->value.function.actual = NULL;
4889 e->expr_type = EXPR_FUNCTION;
4892 /* Ambiguity will not arise if the array reference is not
4893 the last reference. */
4894 for (ref = e->ref; ref; ref = ref->next)
4895 if (ref->type == REF_ARRAY && ref->next == NULL)
4898 gcc_assert (ref->type == REF_ARRAY);
4900 /* Grab the start expressions from the array ref and
4901 copy them into actual arguments. */
4902 for (n = 0; n < ref->u.ar.dimen; n++)
4904 arg = gfc_get_actual_arglist ();
4905 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
4906 if (e->value.function.actual == NULL)
4907 tail = e->value.function.actual = arg;
4915 /* Dump the reference list and set the rank. */
4916 gfc_free_ref_list (e->ref);
4918 e->rank = sym->as ? sym->as->rank : 0;
4921 gfc_resolve_expr (e);
4925 /* This might have changed! */
4926 return e->expr_type == EXPR_FUNCTION;
4931 gfc_resolve_character_operator (gfc_expr *e)
4933 gfc_expr *op1 = e->value.op.op1;
4934 gfc_expr *op2 = e->value.op.op2;
4935 gfc_expr *e1 = NULL;
4936 gfc_expr *e2 = NULL;
4938 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
4940 if (op1->ts.u.cl && op1->ts.u.cl->length)
4941 e1 = gfc_copy_expr (op1->ts.u.cl->length);
4942 else if (op1->expr_type == EXPR_CONSTANT)
4943 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4944 op1->value.character.length);
4946 if (op2->ts.u.cl && op2->ts.u.cl->length)
4947 e2 = gfc_copy_expr (op2->ts.u.cl->length);
4948 else if (op2->expr_type == EXPR_CONSTANT)
4949 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
4950 op2->value.character.length);
4952 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4957 e->ts.u.cl->length = gfc_add (e1, e2);
4958 e->ts.u.cl->length->ts.type = BT_INTEGER;
4959 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4960 gfc_simplify_expr (e->ts.u.cl->length, 0);
4961 gfc_resolve_expr (e->ts.u.cl->length);
4967 /* Ensure that an character expression has a charlen and, if possible, a
4968 length expression. */
4971 fixup_charlen (gfc_expr *e)
4973 /* The cases fall through so that changes in expression type and the need
4974 for multiple fixes are picked up. In all circumstances, a charlen should
4975 be available for the middle end to hang a backend_decl on. */
4976 switch (e->expr_type)
4979 gfc_resolve_character_operator (e);
4982 if (e->expr_type == EXPR_ARRAY)
4983 gfc_resolve_character_array_constructor (e);
4985 case EXPR_SUBSTRING:
4986 if (!e->ts.u.cl && e->ref)
4987 gfc_resolve_substring_charlen (e);
4991 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4998 /* Update an actual argument to include the passed-object for type-bound
4999 procedures at the right position. */
5001 static gfc_actual_arglist*
5002 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5005 gcc_assert (argpos > 0);
5009 gfc_actual_arglist* result;
5011 result = gfc_get_actual_arglist ();
5015 result->name = name;
5021 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5023 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5028 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5031 extract_compcall_passed_object (gfc_expr* e)
5035 gcc_assert (e->expr_type == EXPR_COMPCALL);
5037 if (e->value.compcall.base_object)
5038 po = gfc_copy_expr (e->value.compcall.base_object);
5041 po = gfc_get_expr ();
5042 po->expr_type = EXPR_VARIABLE;
5043 po->symtree = e->symtree;
5044 po->ref = gfc_copy_ref (e->ref);
5045 po->where = e->where;
5048 if (gfc_resolve_expr (po) == FAILURE)
5055 /* Update the arglist of an EXPR_COMPCALL expression to include the
5059 update_compcall_arglist (gfc_expr* e)
5062 gfc_typebound_proc* tbp;
5064 tbp = e->value.compcall.tbp;
5069 po = extract_compcall_passed_object (e);
5073 if (tbp->nopass || e->value.compcall.ignore_pass)
5079 gcc_assert (tbp->pass_arg_num > 0);
5080 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5088 /* Extract the passed object from a PPC call (a copy of it). */
5091 extract_ppc_passed_object (gfc_expr *e)
5096 po = gfc_get_expr ();
5097 po->expr_type = EXPR_VARIABLE;
5098 po->symtree = e->symtree;
5099 po->ref = gfc_copy_ref (e->ref);
5100 po->where = e->where;
5102 /* Remove PPC reference. */
5104 while ((*ref)->next)
5105 ref = &(*ref)->next;
5106 gfc_free_ref_list (*ref);
5109 if (gfc_resolve_expr (po) == FAILURE)
5116 /* Update the actual arglist of a procedure pointer component to include the
5120 update_ppc_arglist (gfc_expr* e)
5124 gfc_typebound_proc* tb;
5126 if (!gfc_is_proc_ptr_comp (e, &ppc))
5133 else if (tb->nopass)
5136 po = extract_ppc_passed_object (e);
5142 gfc_error ("Passed-object at %L must be scalar", &e->where);
5146 gcc_assert (tb->pass_arg_num > 0);
5147 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5155 /* Check that the object a TBP is called on is valid, i.e. it must not be
5156 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5159 check_typebound_baseobject (gfc_expr* e)
5163 base = extract_compcall_passed_object (e);
5167 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5169 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5171 gfc_error ("Base object for type-bound procedure call at %L is of"
5172 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5176 /* If the procedure called is NOPASS, the base object must be scalar. */
5177 if (e->value.compcall.tbp->nopass && base->rank > 0)
5179 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5180 " be scalar", &e->where);
5184 /* FIXME: Remove once PR 41177 (this problem) is fixed completely. */
5187 gfc_error ("Non-scalar base object at %L currently not implemented",
5196 /* Resolve a call to a type-bound procedure, either function or subroutine,
5197 statically from the data in an EXPR_COMPCALL expression. The adapted
5198 arglist and the target-procedure symtree are returned. */
5201 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5202 gfc_actual_arglist** actual)
5204 gcc_assert (e->expr_type == EXPR_COMPCALL);
5205 gcc_assert (!e->value.compcall.tbp->is_generic);
5207 /* Update the actual arglist for PASS. */
5208 if (update_compcall_arglist (e) == FAILURE)
5211 *actual = e->value.compcall.actual;
5212 *target = e->value.compcall.tbp->u.specific;
5214 gfc_free_ref_list (e->ref);
5216 e->value.compcall.actual = NULL;
5222 /* Get the ultimate declared type from an expression. In addition,
5223 return the last class/derived type reference and the copy of the
5226 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5229 gfc_symbol *declared;
5236 *new_ref = gfc_copy_ref (e->ref);
5238 for (ref = e->ref; ref; ref = ref->next)
5240 if (ref->type != REF_COMPONENT)
5243 if (ref->u.c.component->ts.type == BT_CLASS
5244 || ref->u.c.component->ts.type == BT_DERIVED)
5246 declared = ref->u.c.component->ts.u.derived;
5252 if (declared == NULL)
5253 declared = e->symtree->n.sym->ts.u.derived;
5259 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5260 which of the specific bindings (if any) matches the arglist and transform
5261 the expression into a call of that binding. */
5264 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5266 gfc_typebound_proc* genproc;
5267 const char* genname;
5269 gfc_symbol *derived;
5271 gcc_assert (e->expr_type == EXPR_COMPCALL);
5272 genname = e->value.compcall.name;
5273 genproc = e->value.compcall.tbp;
5275 if (!genproc->is_generic)
5278 /* Try the bindings on this type and in the inheritance hierarchy. */
5279 for (; genproc; genproc = genproc->overridden)
5283 gcc_assert (genproc->is_generic);
5284 for (g = genproc->u.generic; g; g = g->next)
5287 gfc_actual_arglist* args;
5290 gcc_assert (g->specific);
5292 if (g->specific->error)
5295 target = g->specific->u.specific->n.sym;
5297 /* Get the right arglist by handling PASS/NOPASS. */
5298 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5299 if (!g->specific->nopass)
5302 po = extract_compcall_passed_object (e);
5306 gcc_assert (g->specific->pass_arg_num > 0);
5307 gcc_assert (!g->specific->error);
5308 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5309 g->specific->pass_arg);
5311 resolve_actual_arglist (args, target->attr.proc,
5312 is_external_proc (target) && !target->formal);
5314 /* Check if this arglist matches the formal. */
5315 matches = gfc_arglist_matches_symbol (&args, target);
5317 /* Clean up and break out of the loop if we've found it. */
5318 gfc_free_actual_arglist (args);
5321 e->value.compcall.tbp = g->specific;
5322 /* Pass along the name for CLASS methods, where the vtab
5323 procedure pointer component has to be referenced. */
5325 *name = g->specific_st->name;
5331 /* Nothing matching found! */
5332 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5333 " '%s' at %L", genname, &e->where);
5337 /* Make sure that we have the right specific instance for the name. */
5338 genname = e->value.compcall.tbp->u.specific->name;
5340 /* Is the symtree name a "unique name". */
5341 if (*genname == '@')
5342 genname = e->value.compcall.tbp->u.specific->n.sym->name;
5344 derived = get_declared_from_expr (NULL, NULL, e);
5346 st = gfc_find_typebound_proc (derived, NULL, genname, false, &e->where);
5348 e->value.compcall.tbp = st->n.tb;
5354 /* Resolve a call to a type-bound subroutine. */
5357 resolve_typebound_call (gfc_code* c, const char **name)
5359 gfc_actual_arglist* newactual;
5360 gfc_symtree* target;
5362 /* Check that's really a SUBROUTINE. */
5363 if (!c->expr1->value.compcall.tbp->subroutine)
5365 gfc_error ("'%s' at %L should be a SUBROUTINE",
5366 c->expr1->value.compcall.name, &c->loc);
5370 if (check_typebound_baseobject (c->expr1) == FAILURE)
5373 /* Pass along the name for CLASS methods, where the vtab
5374 procedure pointer component has to be referenced. */
5376 *name = c->expr1->value.compcall.name;
5378 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5381 /* Transform into an ordinary EXEC_CALL for now. */
5383 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5386 c->ext.actual = newactual;
5387 c->symtree = target;
5388 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5390 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5392 gfc_free_expr (c->expr1);
5393 c->expr1 = gfc_get_expr ();
5394 c->expr1->expr_type = EXPR_FUNCTION;
5395 c->expr1->symtree = target;
5396 c->expr1->where = c->loc;
5398 return resolve_call (c);
5402 /* Resolve a component-call expression. */
5404 resolve_compcall (gfc_expr* e, const char **name)
5406 gfc_actual_arglist* newactual;
5407 gfc_symtree* target;
5409 /* Check that's really a FUNCTION. */
5410 if (!e->value.compcall.tbp->function)
5412 gfc_error ("'%s' at %L should be a FUNCTION",
5413 e->value.compcall.name, &e->where);
5417 /* These must not be assign-calls! */
5418 gcc_assert (!e->value.compcall.assign);
5420 if (check_typebound_baseobject (e) == FAILURE)
5423 /* Pass along the name for CLASS methods, where the vtab
5424 procedure pointer component has to be referenced. */
5426 *name = e->value.compcall.name;
5428 if (resolve_typebound_generic_call (e, name) == FAILURE)
5430 gcc_assert (!e->value.compcall.tbp->is_generic);
5432 /* Take the rank from the function's symbol. */
5433 if (e->value.compcall.tbp->u.specific->n.sym->as)
5434 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5436 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5437 arglist to the TBP's binding target. */
5439 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5442 e->value.function.actual = newactual;
5443 e->value.function.name = NULL;
5444 e->value.function.esym = target->n.sym;
5445 e->value.function.isym = NULL;
5446 e->symtree = target;
5447 e->ts = target->n.sym->ts;
5448 e->expr_type = EXPR_FUNCTION;
5450 /* Resolution is not necessary if this is a class subroutine; this
5451 function only has to identify the specific proc. Resolution of
5452 the call will be done next in resolve_typebound_call. */
5453 return gfc_resolve_expr (e);
5458 /* Resolve a typebound function, or 'method'. First separate all
5459 the non-CLASS references by calling resolve_compcall directly. */
5462 resolve_typebound_function (gfc_expr* e)
5464 gfc_symbol *declared;
5470 const char *genname;
5475 return resolve_compcall (e, NULL);
5477 if (resolve_ref (e) == FAILURE)
5480 /* Get the CLASS declared type. */
5481 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5483 /* Weed out cases of the ultimate component being a derived type. */
5484 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5485 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5487 gfc_free_ref_list (new_ref);
5488 return resolve_compcall (e, NULL);
5491 c = gfc_find_component (declared, "$data", true, true);
5492 declared = c->ts.u.derived;
5494 /* Keep the generic name so that the vtab reference can be made. */
5496 if (e->value.compcall.tbp->is_generic)
5497 genname = e->value.compcall.name;
5499 /* Treat the call as if it is a typebound procedure, in order to roll
5500 out the correct name for the specific function. */
5501 if (resolve_compcall (e, &name) == FAILURE)
5505 /* Then convert the expression to a procedure pointer component call. */
5506 e->value.function.esym = NULL;
5512 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5513 gfc_add_component_ref (e, "$vptr");
5516 /* A generic procedure needs the subsidiary vtabs and vtypes for
5517 the specific procedures to have been build. */
5519 vtab = gfc_find_derived_vtab (declared, true);
5521 gfc_add_component_ref (e, genname);
5523 gfc_add_component_ref (e, name);
5525 /* Recover the typespec for the expression. This is really only
5526 necessary for generic procedures, where the additional call
5527 to gfc_add_component_ref seems to throw the collection of the
5528 correct typespec. */
5533 /* Resolve a typebound subroutine, or 'method'. First separate all
5534 the non-CLASS references by calling resolve_typebound_call
5538 resolve_typebound_subroutine (gfc_code *code)
5540 gfc_symbol *declared;
5545 const char *genname;
5549 st = code->expr1->symtree;
5551 return resolve_typebound_call (code, NULL);
5553 if (resolve_ref (code->expr1) == FAILURE)
5556 /* Get the CLASS declared type. */
5557 declared = get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5559 /* Weed out cases of the ultimate component being a derived type. */
5560 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5561 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5563 gfc_free_ref_list (new_ref);
5564 return resolve_typebound_call (code, NULL);
5567 c = gfc_find_component (declared, "$data", true, true);
5568 declared = c->ts.u.derived;
5570 /* Keep the generic name so that the vtab reference can be made. */
5572 if (code->expr1->value.compcall.tbp->is_generic)
5573 genname = code->expr1->value.compcall.name;
5575 if (resolve_typebound_call (code, &name) == FAILURE)
5577 ts = code->expr1->ts;
5579 /* Then convert the expression to a procedure pointer component call. */
5580 code->expr1->value.function.esym = NULL;
5581 code->expr1->symtree = st;
5584 code->expr1->ref = new_ref;
5586 /* '$vptr' points to the vtab, which contains the procedure pointers. */
5587 gfc_add_component_ref (code->expr1, "$vptr");
5590 /* A generic procedure needs the subsidiary vtabs and vtypes for
5591 the specific procedures to have been build. */
5593 vtab = gfc_find_derived_vtab (declared, true);
5595 gfc_add_component_ref (code->expr1, genname);
5597 gfc_add_component_ref (code->expr1, name);
5599 /* Recover the typespec for the expression. This is really only
5600 necessary for generic procedures, where the additional call
5601 to gfc_add_component_ref seems to throw the collection of the
5602 correct typespec. */
5603 code->expr1->ts = ts;
5608 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5611 resolve_ppc_call (gfc_code* c)
5613 gfc_component *comp;
5616 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5619 c->resolved_sym = c->expr1->symtree->n.sym;
5620 c->expr1->expr_type = EXPR_VARIABLE;
5622 if (!comp->attr.subroutine)
5623 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5625 if (resolve_ref (c->expr1) == FAILURE)
5628 if (update_ppc_arglist (c->expr1) == FAILURE)
5631 c->ext.actual = c->expr1->value.compcall.actual;
5633 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
5634 comp->formal == NULL) == FAILURE)
5637 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
5643 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
5646 resolve_expr_ppc (gfc_expr* e)
5648 gfc_component *comp;
5651 b = gfc_is_proc_ptr_comp (e, &comp);
5654 /* Convert to EXPR_FUNCTION. */
5655 e->expr_type = EXPR_FUNCTION;
5656 e->value.function.isym = NULL;
5657 e->value.function.actual = e->value.compcall.actual;
5659 if (comp->as != NULL)
5660 e->rank = comp->as->rank;
5662 if (!comp->attr.function)
5663 gfc_add_function (&comp->attr, comp->name, &e->where);
5665 if (resolve_ref (e) == FAILURE)
5668 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
5669 comp->formal == NULL) == FAILURE)
5672 if (update_ppc_arglist (e) == FAILURE)
5675 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
5682 gfc_is_expandable_expr (gfc_expr *e)
5684 gfc_constructor *con;
5686 if (e->expr_type == EXPR_ARRAY)
5688 /* Traverse the constructor looking for variables that are flavor
5689 parameter. Parameters must be expanded since they are fully used at
5691 con = gfc_constructor_first (e->value.constructor);
5692 for (; con; con = gfc_constructor_next (con))
5694 if (con->expr->expr_type == EXPR_VARIABLE
5695 && con->expr->symtree
5696 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
5697 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
5699 if (con->expr->expr_type == EXPR_ARRAY
5700 && gfc_is_expandable_expr (con->expr))
5708 /* Resolve an expression. That is, make sure that types of operands agree
5709 with their operators, intrinsic operators are converted to function calls
5710 for overloaded types and unresolved function references are resolved. */
5713 gfc_resolve_expr (gfc_expr *e)
5721 /* inquiry_argument only applies to variables. */
5722 inquiry_save = inquiry_argument;
5723 if (e->expr_type != EXPR_VARIABLE)
5724 inquiry_argument = false;
5726 switch (e->expr_type)
5729 t = resolve_operator (e);
5735 if (check_host_association (e))
5736 t = resolve_function (e);
5739 t = resolve_variable (e);
5741 expression_rank (e);
5744 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
5745 && e->ref->type != REF_SUBSTRING)
5746 gfc_resolve_substring_charlen (e);
5751 t = resolve_typebound_function (e);
5754 case EXPR_SUBSTRING:
5755 t = resolve_ref (e);
5764 t = resolve_expr_ppc (e);
5769 if (resolve_ref (e) == FAILURE)
5772 t = gfc_resolve_array_constructor (e);
5773 /* Also try to expand a constructor. */
5776 expression_rank (e);
5777 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
5778 gfc_expand_constructor (e);
5781 /* This provides the opportunity for the length of constructors with
5782 character valued function elements to propagate the string length
5783 to the expression. */
5784 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
5786 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
5787 here rather then add a duplicate test for it above. */
5788 gfc_expand_constructor (e);
5789 t = gfc_resolve_character_array_constructor (e);
5794 case EXPR_STRUCTURE:
5795 t = resolve_ref (e);
5799 t = resolve_structure_cons (e);
5803 t = gfc_simplify_expr (e, 0);
5807 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
5810 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
5813 inquiry_argument = inquiry_save;
5819 /* Resolve an expression from an iterator. They must be scalar and have
5820 INTEGER or (optionally) REAL type. */
5823 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
5824 const char *name_msgid)
5826 if (gfc_resolve_expr (expr) == FAILURE)
5829 if (expr->rank != 0)
5831 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
5835 if (expr->ts.type != BT_INTEGER)
5837 if (expr->ts.type == BT_REAL)
5840 return gfc_notify_std (GFC_STD_F95_DEL,
5841 "Deleted feature: %s at %L must be integer",
5842 _(name_msgid), &expr->where);
5845 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
5852 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
5860 /* Resolve the expressions in an iterator structure. If REAL_OK is
5861 false allow only INTEGER type iterators, otherwise allow REAL types. */
5864 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
5866 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
5870 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
5872 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
5877 if (gfc_resolve_iterator_expr (iter->start, real_ok,
5878 "Start expression in DO loop") == FAILURE)
5881 if (gfc_resolve_iterator_expr (iter->end, real_ok,
5882 "End expression in DO loop") == FAILURE)
5885 if (gfc_resolve_iterator_expr (iter->step, real_ok,
5886 "Step expression in DO loop") == FAILURE)
5889 if (iter->step->expr_type == EXPR_CONSTANT)
5891 if ((iter->step->ts.type == BT_INTEGER
5892 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
5893 || (iter->step->ts.type == BT_REAL
5894 && mpfr_sgn (iter->step->value.real) == 0))
5896 gfc_error ("Step expression in DO loop at %L cannot be zero",
5897 &iter->step->where);
5902 /* Convert start, end, and step to the same type as var. */
5903 if (iter->start->ts.kind != iter->var->ts.kind
5904 || iter->start->ts.type != iter->var->ts.type)
5905 gfc_convert_type (iter->start, &iter->var->ts, 2);
5907 if (iter->end->ts.kind != iter->var->ts.kind
5908 || iter->end->ts.type != iter->var->ts.type)
5909 gfc_convert_type (iter->end, &iter->var->ts, 2);
5911 if (iter->step->ts.kind != iter->var->ts.kind
5912 || iter->step->ts.type != iter->var->ts.type)
5913 gfc_convert_type (iter->step, &iter->var->ts, 2);
5915 if (iter->start->expr_type == EXPR_CONSTANT
5916 && iter->end->expr_type == EXPR_CONSTANT
5917 && iter->step->expr_type == EXPR_CONSTANT)
5920 if (iter->start->ts.type == BT_INTEGER)
5922 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
5923 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
5927 sgn = mpfr_sgn (iter->step->value.real);
5928 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
5930 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
5931 gfc_warning ("DO loop at %L will be executed zero times",
5932 &iter->step->where);
5939 /* Traversal function for find_forall_index. f == 2 signals that
5940 that variable itself is not to be checked - only the references. */
5943 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
5945 if (expr->expr_type != EXPR_VARIABLE)
5948 /* A scalar assignment */
5949 if (!expr->ref || *f == 1)
5951 if (expr->symtree->n.sym == sym)
5963 /* Check whether the FORALL index appears in the expression or not.
5964 Returns SUCCESS if SYM is found in EXPR. */
5967 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
5969 if (gfc_traverse_expr (expr, sym, forall_index, f))
5976 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
5977 to be a scalar INTEGER variable. The subscripts and stride are scalar
5978 INTEGERs, and if stride is a constant it must be nonzero.
5979 Furthermore "A subscript or stride in a forall-triplet-spec shall
5980 not contain a reference to any index-name in the
5981 forall-triplet-spec-list in which it appears." (7.5.4.1) */
5984 resolve_forall_iterators (gfc_forall_iterator *it)
5986 gfc_forall_iterator *iter, *iter2;
5988 for (iter = it; iter; iter = iter->next)
5990 if (gfc_resolve_expr (iter->var) == SUCCESS
5991 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
5992 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
5995 if (gfc_resolve_expr (iter->start) == SUCCESS
5996 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
5997 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
5998 &iter->start->where);
5999 if (iter->var->ts.kind != iter->start->ts.kind)
6000 gfc_convert_type (iter->start, &iter->var->ts, 2);
6002 if (gfc_resolve_expr (iter->end) == SUCCESS
6003 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6004 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6006 if (iter->var->ts.kind != iter->end->ts.kind)
6007 gfc_convert_type (iter->end, &iter->var->ts, 2);
6009 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6011 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6012 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6013 &iter->stride->where, "INTEGER");
6015 if (iter->stride->expr_type == EXPR_CONSTANT
6016 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6017 gfc_error ("FORALL stride expression at %L cannot be zero",
6018 &iter->stride->where);
6020 if (iter->var->ts.kind != iter->stride->ts.kind)
6021 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6024 for (iter = it; iter; iter = iter->next)
6025 for (iter2 = iter; iter2; iter2 = iter2->next)
6027 if (find_forall_index (iter2->start,
6028 iter->var->symtree->n.sym, 0) == SUCCESS
6029 || find_forall_index (iter2->end,
6030 iter->var->symtree->n.sym, 0) == SUCCESS
6031 || find_forall_index (iter2->stride,
6032 iter->var->symtree->n.sym, 0) == SUCCESS)
6033 gfc_error ("FORALL index '%s' may not appear in triplet "
6034 "specification at %L", iter->var->symtree->name,
6035 &iter2->start->where);
6040 /* Given a pointer to a symbol that is a derived type, see if it's
6041 inaccessible, i.e. if it's defined in another module and the components are
6042 PRIVATE. The search is recursive if necessary. Returns zero if no
6043 inaccessible components are found, nonzero otherwise. */
6046 derived_inaccessible (gfc_symbol *sym)
6050 if (sym->attr.use_assoc && sym->attr.private_comp)
6053 for (c = sym->components; c; c = c->next)
6055 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6063 /* Resolve the argument of a deallocate expression. The expression must be
6064 a pointer or a full array. */
6067 resolve_deallocate_expr (gfc_expr *e)
6069 symbol_attribute attr;
6070 int allocatable, pointer, check_intent_in;
6075 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6076 check_intent_in = 1;
6078 if (gfc_resolve_expr (e) == FAILURE)
6081 if (e->expr_type != EXPR_VARIABLE)
6084 sym = e->symtree->n.sym;
6086 if (sym->ts.type == BT_CLASS)
6088 allocatable = CLASS_DATA (sym)->attr.allocatable;
6089 pointer = CLASS_DATA (sym)->attr.pointer;
6093 allocatable = sym->attr.allocatable;
6094 pointer = sym->attr.pointer;
6096 for (ref = e->ref; ref; ref = ref->next)
6099 check_intent_in = 0;
6104 if (ref->u.ar.type != AR_FULL)
6109 c = ref->u.c.component;
6110 if (c->ts.type == BT_CLASS)
6112 allocatable = CLASS_DATA (c)->attr.allocatable;
6113 pointer = CLASS_DATA (c)->attr.pointer;
6117 allocatable = c->attr.allocatable;
6118 pointer = c->attr.pointer;
6128 attr = gfc_expr_attr (e);
6130 if (allocatable == 0 && attr.pointer == 0)
6133 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6138 if (check_intent_in && sym->attr.intent == INTENT_IN)
6140 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
6141 sym->name, &e->where);
6145 if (e->ts.type == BT_CLASS)
6147 /* Only deallocate the DATA component. */
6148 gfc_add_component_ref (e, "$data");
6155 /* Returns true if the expression e contains a reference to the symbol sym. */
6157 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6159 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6166 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6168 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6172 /* Given the expression node e for an allocatable/pointer of derived type to be
6173 allocated, get the expression node to be initialized afterwards (needed for
6174 derived types with default initializers, and derived types with allocatable
6175 components that need nullification.) */
6178 gfc_expr_to_initialize (gfc_expr *e)
6184 result = gfc_copy_expr (e);
6186 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6187 for (ref = result->ref; ref; ref = ref->next)
6188 if (ref->type == REF_ARRAY && ref->next == NULL)
6190 ref->u.ar.type = AR_FULL;
6192 for (i = 0; i < ref->u.ar.dimen; i++)
6193 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6195 result->rank = ref->u.ar.dimen;
6203 /* Used in resolve_allocate_expr to check that a allocation-object and
6204 a source-expr are conformable. This does not catch all possible
6205 cases; in particular a runtime checking is needed. */
6208 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6211 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6213 /* First compare rank. */
6214 if (tail && e1->rank != tail->u.ar.as->rank)
6216 gfc_error ("Source-expr at %L must be scalar or have the "
6217 "same rank as the allocate-object at %L",
6218 &e1->where, &e2->where);
6229 for (i = 0; i < e1->rank; i++)
6231 if (tail->u.ar.end[i])
6233 mpz_set (s, tail->u.ar.end[i]->value.integer);
6234 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6235 mpz_add_ui (s, s, 1);
6239 mpz_set (s, tail->u.ar.start[i]->value.integer);
6242 if (mpz_cmp (e1->shape[i], s) != 0)
6244 gfc_error ("Source-expr at %L and allocate-object at %L must "
6245 "have the same shape", &e1->where, &e2->where);
6258 /* Resolve the expression in an ALLOCATE statement, doing the additional
6259 checks to see whether the expression is OK or not. The expression must
6260 have a trailing array reference that gives the size of the array. */
6263 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6265 int i, pointer, allocatable, dimension, check_intent_in, is_abstract;
6267 symbol_attribute attr;
6268 gfc_ref *ref, *ref2;
6270 gfc_symbol *sym = NULL;
6274 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
6275 check_intent_in = 1;
6277 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6278 checking of coarrays. */
6279 for (ref = e->ref; ref; ref = ref->next)
6280 if (ref->next == NULL)
6283 if (ref && ref->type == REF_ARRAY)
6284 ref->u.ar.in_allocate = true;
6286 if (gfc_resolve_expr (e) == FAILURE)
6289 /* Make sure the expression is allocatable or a pointer. If it is
6290 pointer, the next-to-last reference must be a pointer. */
6294 sym = e->symtree->n.sym;
6296 /* Check whether ultimate component is abstract and CLASS. */
6299 if (e->expr_type != EXPR_VARIABLE)
6302 attr = gfc_expr_attr (e);
6303 pointer = attr.pointer;
6304 dimension = attr.dimension;
6305 codimension = attr.codimension;
6309 if (sym->ts.type == BT_CLASS)
6311 allocatable = CLASS_DATA (sym)->attr.allocatable;
6312 pointer = CLASS_DATA (sym)->attr.pointer;
6313 dimension = CLASS_DATA (sym)->attr.dimension;
6314 codimension = CLASS_DATA (sym)->attr.codimension;
6315 is_abstract = CLASS_DATA (sym)->attr.abstract;
6319 allocatable = sym->attr.allocatable;
6320 pointer = sym->attr.pointer;
6321 dimension = sym->attr.dimension;
6322 codimension = sym->attr.codimension;
6325 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6328 check_intent_in = 0;
6333 if (ref->next != NULL)
6339 if (gfc_is_coindexed (e))
6341 gfc_error ("Coindexed allocatable object at %L",
6346 c = ref->u.c.component;
6347 if (c->ts.type == BT_CLASS)
6349 allocatable = CLASS_DATA (c)->attr.allocatable;
6350 pointer = CLASS_DATA (c)->attr.pointer;
6351 dimension = CLASS_DATA (c)->attr.dimension;
6352 codimension = CLASS_DATA (c)->attr.codimension;
6353 is_abstract = CLASS_DATA (c)->attr.abstract;
6357 allocatable = c->attr.allocatable;
6358 pointer = c->attr.pointer;
6359 dimension = c->attr.dimension;
6360 codimension = c->attr.codimension;
6361 is_abstract = c->attr.abstract;
6373 if (allocatable == 0 && pointer == 0)
6375 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6380 /* Some checks for the SOURCE tag. */
6383 /* Check F03:C631. */
6384 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6386 gfc_error ("Type of entity at %L is type incompatible with "
6387 "source-expr at %L", &e->where, &code->expr3->where);
6391 /* Check F03:C632 and restriction following Note 6.18. */
6392 if (code->expr3->rank > 0
6393 && conformable_arrays (code->expr3, e) == FAILURE)
6396 /* Check F03:C633. */
6397 if (code->expr3->ts.kind != e->ts.kind)
6399 gfc_error ("The allocate-object at %L and the source-expr at %L "
6400 "shall have the same kind type parameter",
6401 &e->where, &code->expr3->where);
6406 /* Check F08:C629. */
6407 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6410 gcc_assert (e->ts.type == BT_CLASS);
6411 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6412 "type-spec or source-expr", sym->name, &e->where);
6416 if (check_intent_in && sym->attr.intent == INTENT_IN)
6418 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
6419 sym->name, &e->where);
6423 if (!code->expr3 || code->expr3->mold)
6425 /* Add default initializer for those derived types that need them. */
6426 gfc_expr *init_e = NULL;
6429 if (code->ext.alloc.ts.type == BT_DERIVED)
6430 ts = code->ext.alloc.ts;
6431 else if (code->expr3)
6432 ts = code->expr3->ts;
6436 if (ts.type == BT_DERIVED)
6437 init_e = gfc_default_initializer (&ts);
6438 /* FIXME: Use default init of dynamic type (cf. PR 44541). */
6439 else if (e->ts.type == BT_CLASS)
6440 init_e = gfc_default_initializer (&ts.u.derived->components->ts);
6444 gfc_code *init_st = gfc_get_code ();
6445 init_st->loc = code->loc;
6446 init_st->op = EXEC_INIT_ASSIGN;
6447 init_st->expr1 = gfc_expr_to_initialize (e);
6448 init_st->expr2 = init_e;
6449 init_st->next = code->next;
6450 code->next = init_st;
6454 if (pointer || (dimension == 0 && codimension == 0))
6457 /* Make sure the next-to-last reference node is an array specification. */
6459 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6460 || (dimension && ref2->u.ar.dimen == 0))
6462 gfc_error ("Array specification required in ALLOCATE statement "
6463 "at %L", &e->where);
6467 /* Make sure that the array section reference makes sense in the
6468 context of an ALLOCATE specification. */
6472 if (codimension && ar->codimen == 0)
6474 gfc_error ("Coarray specification required in ALLOCATE statement "
6475 "at %L", &e->where);
6479 for (i = 0; i < ar->dimen; i++)
6481 if (ref2->u.ar.type == AR_ELEMENT)
6484 switch (ar->dimen_type[i])
6490 if (ar->start[i] != NULL
6491 && ar->end[i] != NULL
6492 && ar->stride[i] == NULL)
6495 /* Fall Through... */
6500 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6506 for (a = code->ext.alloc.list; a; a = a->next)
6508 sym = a->expr->symtree->n.sym;
6510 /* TODO - check derived type components. */
6511 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6514 if ((ar->start[i] != NULL
6515 && gfc_find_sym_in_expr (sym, ar->start[i]))
6516 || (ar->end[i] != NULL
6517 && gfc_find_sym_in_expr (sym, ar->end[i])))
6519 gfc_error ("'%s' must not appear in the array specification at "
6520 "%L in the same ALLOCATE statement where it is "
6521 "itself allocated", sym->name, &ar->where);
6527 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6529 if (ar->dimen_type[i] == DIMEN_ELEMENT
6530 || ar->dimen_type[i] == DIMEN_RANGE)
6532 if (i == (ar->dimen + ar->codimen - 1))
6534 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6535 "statement at %L", &e->where);
6541 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6542 && ar->stride[i] == NULL)
6545 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6550 if (codimension && ar->as->rank == 0)
6552 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6553 "at %L", &e->where);
6565 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6567 gfc_expr *stat, *errmsg, *pe, *qe;
6568 gfc_alloc *a, *p, *q;
6570 stat = code->expr1 ? code->expr1 : NULL;
6572 errmsg = code->expr2 ? code->expr2 : NULL;
6574 /* Check the stat variable. */
6577 if (stat->symtree->n.sym->attr.intent == INTENT_IN)
6578 gfc_error ("Stat-variable '%s' at %L cannot be INTENT(IN)",
6579 stat->symtree->n.sym->name, &stat->where);
6581 if (gfc_pure (NULL) && gfc_impure_variable (stat->symtree->n.sym))
6582 gfc_error ("Illegal stat-variable at %L for a PURE procedure",
6585 if ((stat->ts.type != BT_INTEGER
6586 && !(stat->ref && (stat->ref->type == REF_ARRAY
6587 || stat->ref->type == REF_COMPONENT)))
6589 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
6590 "variable", &stat->where);
6592 for (p = code->ext.alloc.list; p; p = p->next)
6593 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
6595 gfc_ref *ref1, *ref2;
6598 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
6599 ref1 = ref1->next, ref2 = ref2->next)
6601 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6603 if (ref1->u.c.component->name != ref2->u.c.component->name)
6612 gfc_error ("Stat-variable at %L shall not be %sd within "
6613 "the same %s statement", &stat->where, fcn, fcn);
6619 /* Check the errmsg variable. */
6623 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
6626 if (errmsg->symtree->n.sym->attr.intent == INTENT_IN)
6627 gfc_error ("Errmsg-variable '%s' at %L cannot be INTENT(IN)",
6628 errmsg->symtree->n.sym->name, &errmsg->where);
6630 if (gfc_pure (NULL) && gfc_impure_variable (errmsg->symtree->n.sym))
6631 gfc_error ("Illegal errmsg-variable at %L for a PURE procedure",
6634 if ((errmsg->ts.type != BT_CHARACTER
6636 && (errmsg->ref->type == REF_ARRAY
6637 || errmsg->ref->type == REF_COMPONENT)))
6638 || errmsg->rank > 0 )
6639 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
6640 "variable", &errmsg->where);
6642 for (p = code->ext.alloc.list; p; p = p->next)
6643 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
6645 gfc_ref *ref1, *ref2;
6648 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
6649 ref1 = ref1->next, ref2 = ref2->next)
6651 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
6653 if (ref1->u.c.component->name != ref2->u.c.component->name)
6662 gfc_error ("Errmsg-variable at %L shall not be %sd within "
6663 "the same %s statement", &errmsg->where, fcn, fcn);
6669 /* Check that an allocate-object appears only once in the statement.
6670 FIXME: Checking derived types is disabled. */
6671 for (p = code->ext.alloc.list; p; p = p->next)
6674 if ((pe->ref && pe->ref->type != REF_COMPONENT)
6675 && (pe->symtree->n.sym->ts.type != BT_DERIVED))
6677 for (q = p->next; q; q = q->next)
6680 if ((qe->ref && qe->ref->type != REF_COMPONENT)
6681 && (qe->symtree->n.sym->ts.type != BT_DERIVED)
6682 && (pe->symtree->n.sym->name == qe->symtree->n.sym->name))
6683 gfc_error ("Allocate-object at %L also appears at %L",
6684 &pe->where, &qe->where);
6689 if (strcmp (fcn, "ALLOCATE") == 0)
6691 for (a = code->ext.alloc.list; a; a = a->next)
6692 resolve_allocate_expr (a->expr, code);
6696 for (a = code->ext.alloc.list; a; a = a->next)
6697 resolve_deallocate_expr (a->expr);
6702 /************ SELECT CASE resolution subroutines ************/
6704 /* Callback function for our mergesort variant. Determines interval
6705 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
6706 op1 > op2. Assumes we're not dealing with the default case.
6707 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
6708 There are nine situations to check. */
6711 compare_cases (const gfc_case *op1, const gfc_case *op2)
6715 if (op1->low == NULL) /* op1 = (:L) */
6717 /* op2 = (:N), so overlap. */
6719 /* op2 = (M:) or (M:N), L < M */
6720 if (op2->low != NULL
6721 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6724 else if (op1->high == NULL) /* op1 = (K:) */
6726 /* op2 = (M:), so overlap. */
6728 /* op2 = (:N) or (M:N), K > N */
6729 if (op2->high != NULL
6730 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6733 else /* op1 = (K:L) */
6735 if (op2->low == NULL) /* op2 = (:N), K > N */
6736 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6738 else if (op2->high == NULL) /* op2 = (M:), L < M */
6739 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6741 else /* op2 = (M:N) */
6745 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
6748 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
6757 /* Merge-sort a double linked case list, detecting overlap in the
6758 process. LIST is the head of the double linked case list before it
6759 is sorted. Returns the head of the sorted list if we don't see any
6760 overlap, or NULL otherwise. */
6763 check_case_overlap (gfc_case *list)
6765 gfc_case *p, *q, *e, *tail;
6766 int insize, nmerges, psize, qsize, cmp, overlap_seen;
6768 /* If the passed list was empty, return immediately. */
6775 /* Loop unconditionally. The only exit from this loop is a return
6776 statement, when we've finished sorting the case list. */
6783 /* Count the number of merges we do in this pass. */
6786 /* Loop while there exists a merge to be done. */
6791 /* Count this merge. */
6794 /* Cut the list in two pieces by stepping INSIZE places
6795 forward in the list, starting from P. */
6798 for (i = 0; i < insize; i++)
6807 /* Now we have two lists. Merge them! */
6808 while (psize > 0 || (qsize > 0 && q != NULL))
6810 /* See from which the next case to merge comes from. */
6813 /* P is empty so the next case must come from Q. */
6818 else if (qsize == 0 || q == NULL)
6827 cmp = compare_cases (p, q);
6830 /* The whole case range for P is less than the
6838 /* The whole case range for Q is greater than
6839 the case range for P. */
6846 /* The cases overlap, or they are the same
6847 element in the list. Either way, we must
6848 issue an error and get the next case from P. */
6849 /* FIXME: Sort P and Q by line number. */
6850 gfc_error ("CASE label at %L overlaps with CASE "
6851 "label at %L", &p->where, &q->where);
6859 /* Add the next element to the merged list. */
6868 /* P has now stepped INSIZE places along, and so has Q. So
6869 they're the same. */
6874 /* If we have done only one merge or none at all, we've
6875 finished sorting the cases. */
6884 /* Otherwise repeat, merging lists twice the size. */
6890 /* Check to see if an expression is suitable for use in a CASE statement.
6891 Makes sure that all case expressions are scalar constants of the same
6892 type. Return FAILURE if anything is wrong. */
6895 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
6897 if (e == NULL) return SUCCESS;
6899 if (e->ts.type != case_expr->ts.type)
6901 gfc_error ("Expression in CASE statement at %L must be of type %s",
6902 &e->where, gfc_basic_typename (case_expr->ts.type));
6906 /* C805 (R808) For a given case-construct, each case-value shall be of
6907 the same type as case-expr. For character type, length differences
6908 are allowed, but the kind type parameters shall be the same. */
6910 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
6912 gfc_error ("Expression in CASE statement at %L must be of kind %d",
6913 &e->where, case_expr->ts.kind);
6917 /* Convert the case value kind to that of case expression kind,
6920 if (e->ts.kind != case_expr->ts.kind)
6921 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
6925 gfc_error ("Expression in CASE statement at %L must be scalar",
6934 /* Given a completely parsed select statement, we:
6936 - Validate all expressions and code within the SELECT.
6937 - Make sure that the selection expression is not of the wrong type.
6938 - Make sure that no case ranges overlap.
6939 - Eliminate unreachable cases and unreachable code resulting from
6940 removing case labels.
6942 The standard does allow unreachable cases, e.g. CASE (5:3). But
6943 they are a hassle for code generation, and to prevent that, we just
6944 cut them out here. This is not necessary for overlapping cases
6945 because they are illegal and we never even try to generate code.
6947 We have the additional caveat that a SELECT construct could have
6948 been a computed GOTO in the source code. Fortunately we can fairly
6949 easily work around that here: The case_expr for a "real" SELECT CASE
6950 is in code->expr1, but for a computed GOTO it is in code->expr2. All
6951 we have to do is make sure that the case_expr is a scalar integer
6955 resolve_select (gfc_code *code)
6958 gfc_expr *case_expr;
6959 gfc_case *cp, *default_case, *tail, *head;
6960 int seen_unreachable;
6966 if (code->expr1 == NULL)
6968 /* This was actually a computed GOTO statement. */
6969 case_expr = code->expr2;
6970 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
6971 gfc_error ("Selection expression in computed GOTO statement "
6972 "at %L must be a scalar integer expression",
6975 /* Further checking is not necessary because this SELECT was built
6976 by the compiler, so it should always be OK. Just move the
6977 case_expr from expr2 to expr so that we can handle computed
6978 GOTOs as normal SELECTs from here on. */
6979 code->expr1 = code->expr2;
6984 case_expr = code->expr1;
6986 type = case_expr->ts.type;
6987 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
6989 gfc_error ("Argument of SELECT statement at %L cannot be %s",
6990 &case_expr->where, gfc_typename (&case_expr->ts));
6992 /* Punt. Going on here just produce more garbage error messages. */
6996 if (case_expr->rank != 0)
6998 gfc_error ("Argument of SELECT statement at %L must be a scalar "
6999 "expression", &case_expr->where);
7006 /* Raise a warning if an INTEGER case value exceeds the range of
7007 the case-expr. Later, all expressions will be promoted to the
7008 largest kind of all case-labels. */
7010 if (type == BT_INTEGER)
7011 for (body = code->block; body; body = body->block)
7012 for (cp = body->ext.case_list; cp; cp = cp->next)
7015 && gfc_check_integer_range (cp->low->value.integer,
7016 case_expr->ts.kind) != ARITH_OK)
7017 gfc_warning ("Expression in CASE statement at %L is "
7018 "not in the range of %s", &cp->low->where,
7019 gfc_typename (&case_expr->ts));
7022 && cp->low != cp->high
7023 && gfc_check_integer_range (cp->high->value.integer,
7024 case_expr->ts.kind) != ARITH_OK)
7025 gfc_warning ("Expression in CASE statement at %L is "
7026 "not in the range of %s", &cp->high->where,
7027 gfc_typename (&case_expr->ts));
7030 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7031 of the SELECT CASE expression and its CASE values. Walk the lists
7032 of case values, and if we find a mismatch, promote case_expr to
7033 the appropriate kind. */
7035 if (type == BT_LOGICAL || type == BT_INTEGER)
7037 for (body = code->block; body; body = body->block)
7039 /* Walk the case label list. */
7040 for (cp = body->ext.case_list; cp; cp = cp->next)
7042 /* Intercept the DEFAULT case. It does not have a kind. */
7043 if (cp->low == NULL && cp->high == NULL)
7046 /* Unreachable case ranges are discarded, so ignore. */
7047 if (cp->low != NULL && cp->high != NULL
7048 && cp->low != cp->high
7049 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7053 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7054 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7056 if (cp->high != NULL
7057 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7058 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7063 /* Assume there is no DEFAULT case. */
7064 default_case = NULL;
7069 for (body = code->block; body; body = body->block)
7071 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7073 seen_unreachable = 0;
7075 /* Walk the case label list, making sure that all case labels
7077 for (cp = body->ext.case_list; cp; cp = cp->next)
7079 /* Count the number of cases in the whole construct. */
7082 /* Intercept the DEFAULT case. */
7083 if (cp->low == NULL && cp->high == NULL)
7085 if (default_case != NULL)
7087 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7088 "by a second DEFAULT CASE at %L",
7089 &default_case->where, &cp->where);
7100 /* Deal with single value cases and case ranges. Errors are
7101 issued from the validation function. */
7102 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7103 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7109 if (type == BT_LOGICAL
7110 && ((cp->low == NULL || cp->high == NULL)
7111 || cp->low != cp->high))
7113 gfc_error ("Logical range in CASE statement at %L is not "
7114 "allowed", &cp->low->where);
7119 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7122 value = cp->low->value.logical == 0 ? 2 : 1;
7123 if (value & seen_logical)
7125 gfc_error ("Constant logical value in CASE statement "
7126 "is repeated at %L",
7131 seen_logical |= value;
7134 if (cp->low != NULL && cp->high != NULL
7135 && cp->low != cp->high
7136 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7138 if (gfc_option.warn_surprising)
7139 gfc_warning ("Range specification at %L can never "
7140 "be matched", &cp->where);
7142 cp->unreachable = 1;
7143 seen_unreachable = 1;
7147 /* If the case range can be matched, it can also overlap with
7148 other cases. To make sure it does not, we put it in a
7149 double linked list here. We sort that with a merge sort
7150 later on to detect any overlapping cases. */
7154 head->right = head->left = NULL;
7159 tail->right->left = tail;
7166 /* It there was a failure in the previous case label, give up
7167 for this case label list. Continue with the next block. */
7171 /* See if any case labels that are unreachable have been seen.
7172 If so, we eliminate them. This is a bit of a kludge because
7173 the case lists for a single case statement (label) is a
7174 single forward linked lists. */
7175 if (seen_unreachable)
7177 /* Advance until the first case in the list is reachable. */
7178 while (body->ext.case_list != NULL
7179 && body->ext.case_list->unreachable)
7181 gfc_case *n = body->ext.case_list;
7182 body->ext.case_list = body->ext.case_list->next;
7184 gfc_free_case_list (n);
7187 /* Strip all other unreachable cases. */
7188 if (body->ext.case_list)
7190 for (cp = body->ext.case_list; cp->next; cp = cp->next)
7192 if (cp->next->unreachable)
7194 gfc_case *n = cp->next;
7195 cp->next = cp->next->next;
7197 gfc_free_case_list (n);
7204 /* See if there were overlapping cases. If the check returns NULL,
7205 there was overlap. In that case we don't do anything. If head
7206 is non-NULL, we prepend the DEFAULT case. The sorted list can
7207 then used during code generation for SELECT CASE constructs with
7208 a case expression of a CHARACTER type. */
7211 head = check_case_overlap (head);
7213 /* Prepend the default_case if it is there. */
7214 if (head != NULL && default_case)
7216 default_case->left = NULL;
7217 default_case->right = head;
7218 head->left = default_case;
7222 /* Eliminate dead blocks that may be the result if we've seen
7223 unreachable case labels for a block. */
7224 for (body = code; body && body->block; body = body->block)
7226 if (body->block->ext.case_list == NULL)
7228 /* Cut the unreachable block from the code chain. */
7229 gfc_code *c = body->block;
7230 body->block = c->block;
7232 /* Kill the dead block, but not the blocks below it. */
7234 gfc_free_statements (c);
7238 /* More than two cases is legal but insane for logical selects.
7239 Issue a warning for it. */
7240 if (gfc_option.warn_surprising && type == BT_LOGICAL
7242 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7247 /* Check if a derived type is extensible. */
7250 gfc_type_is_extensible (gfc_symbol *sym)
7252 return !(sym->attr.is_bind_c || sym->attr.sequence);
7256 /* Resolve a SELECT TYPE statement. */
7259 resolve_select_type (gfc_code *code)
7261 gfc_symbol *selector_type;
7262 gfc_code *body, *new_st, *if_st, *tail;
7263 gfc_code *class_is = NULL, *default_case = NULL;
7266 char name[GFC_MAX_SYMBOL_LEN];
7270 ns = code->ext.block.ns;
7273 /* Check for F03:C813. */
7274 if (code->expr1->ts.type != BT_CLASS
7275 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7277 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7278 "at %L", &code->loc);
7284 if (code->expr1->symtree->n.sym->attr.untyped)
7285 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7286 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7289 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7291 /* Loop over TYPE IS / CLASS IS cases. */
7292 for (body = code->block; body; body = body->block)
7294 c = body->ext.case_list;
7296 /* Check F03:C815. */
7297 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7298 && !gfc_type_is_extensible (c->ts.u.derived))
7300 gfc_error ("Derived type '%s' at %L must be extensible",
7301 c->ts.u.derived->name, &c->where);
7306 /* Check F03:C816. */
7307 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7308 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7310 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7311 c->ts.u.derived->name, &c->where, selector_type->name);
7316 /* Intercept the DEFAULT case. */
7317 if (c->ts.type == BT_UNKNOWN)
7319 /* Check F03:C818. */
7322 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7323 "by a second DEFAULT CASE at %L",
7324 &default_case->ext.case_list->where, &c->where);
7329 default_case = body;
7338 /* Insert assignment for selector variable. */
7339 new_st = gfc_get_code ();
7340 new_st->op = EXEC_ASSIGN;
7341 new_st->expr1 = gfc_copy_expr (code->expr1);
7342 new_st->expr2 = gfc_copy_expr (code->expr2);
7346 /* Put SELECT TYPE statement inside a BLOCK. */
7347 new_st = gfc_get_code ();
7348 new_st->op = code->op;
7349 new_st->expr1 = code->expr1;
7350 new_st->expr2 = code->expr2;
7351 new_st->block = code->block;
7355 ns->code->next = new_st;
7356 code->op = EXEC_BLOCK;
7357 code->ext.block.assoc = NULL;
7358 code->expr1 = code->expr2 = NULL;
7363 /* Transform to EXEC_SELECT. */
7364 code->op = EXEC_SELECT;
7365 gfc_add_component_ref (code->expr1, "$vptr");
7366 gfc_add_component_ref (code->expr1, "$hash");
7368 /* Loop over TYPE IS / CLASS IS cases. */
7369 for (body = code->block; body; body = body->block)
7371 c = body->ext.case_list;
7373 if (c->ts.type == BT_DERIVED)
7374 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7375 c->ts.u.derived->hash_value);
7377 else if (c->ts.type == BT_UNKNOWN)
7380 /* Assign temporary to selector. */
7381 if (c->ts.type == BT_CLASS)
7382 sprintf (name, "tmp$class$%s", c->ts.u.derived->name);
7384 sprintf (name, "tmp$type$%s", c->ts.u.derived->name);
7385 st = gfc_find_symtree (ns->sym_root, name);
7386 new_st = gfc_get_code ();
7387 new_st->expr1 = gfc_get_variable_expr (st);
7388 new_st->expr2 = gfc_get_variable_expr (code->expr1->symtree);
7389 if (c->ts.type == BT_DERIVED)
7391 new_st->op = EXEC_POINTER_ASSIGN;
7392 gfc_add_component_ref (new_st->expr2, "$data");
7395 new_st->op = EXEC_POINTER_ASSIGN;
7396 new_st->next = body->next;
7397 body->next = new_st;
7400 /* Take out CLASS IS cases for separate treatment. */
7402 while (body && body->block)
7404 if (body->block->ext.case_list->ts.type == BT_CLASS)
7406 /* Add to class_is list. */
7407 if (class_is == NULL)
7409 class_is = body->block;
7414 for (tail = class_is; tail->block; tail = tail->block) ;
7415 tail->block = body->block;
7418 /* Remove from EXEC_SELECT list. */
7419 body->block = body->block->block;
7432 /* Add a default case to hold the CLASS IS cases. */
7433 for (tail = code; tail->block; tail = tail->block) ;
7434 tail->block = gfc_get_code ();
7436 tail->op = EXEC_SELECT_TYPE;
7437 tail->ext.case_list = gfc_get_case ();
7438 tail->ext.case_list->ts.type = BT_UNKNOWN;
7440 default_case = tail;
7443 /* More than one CLASS IS block? */
7444 if (class_is->block)
7448 /* Sort CLASS IS blocks by extension level. */
7452 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
7455 /* F03:C817 (check for doubles). */
7456 if ((*c1)->ext.case_list->ts.u.derived->hash_value
7457 == c2->ext.case_list->ts.u.derived->hash_value)
7459 gfc_error ("Double CLASS IS block in SELECT TYPE "
7460 "statement at %L", &c2->ext.case_list->where);
7463 if ((*c1)->ext.case_list->ts.u.derived->attr.extension
7464 < c2->ext.case_list->ts.u.derived->attr.extension)
7467 (*c1)->block = c2->block;
7477 /* Generate IF chain. */
7478 if_st = gfc_get_code ();
7479 if_st->op = EXEC_IF;
7481 for (body = class_is; body; body = body->block)
7483 new_st->block = gfc_get_code ();
7484 new_st = new_st->block;
7485 new_st->op = EXEC_IF;
7486 /* Set up IF condition: Call _gfortran_is_extension_of. */
7487 new_st->expr1 = gfc_get_expr ();
7488 new_st->expr1->expr_type = EXPR_FUNCTION;
7489 new_st->expr1->ts.type = BT_LOGICAL;
7490 new_st->expr1->ts.kind = 4;
7491 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
7492 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
7493 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
7494 /* Set up arguments. */
7495 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
7496 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
7497 gfc_add_component_ref (new_st->expr1->value.function.actual->expr, "$vptr");
7498 vtab = gfc_find_derived_vtab (body->ext.case_list->ts.u.derived, true);
7499 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
7500 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
7501 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
7502 new_st->next = body->next;
7504 if (default_case->next)
7506 new_st->block = gfc_get_code ();
7507 new_st = new_st->block;
7508 new_st->op = EXEC_IF;
7509 new_st->next = default_case->next;
7512 /* Replace CLASS DEFAULT code by the IF chain. */
7513 default_case->next = if_st;
7516 resolve_select (code);
7521 /* Resolve a transfer statement. This is making sure that:
7522 -- a derived type being transferred has only non-pointer components
7523 -- a derived type being transferred doesn't have private components, unless
7524 it's being transferred from the module where the type was defined
7525 -- we're not trying to transfer a whole assumed size array. */
7528 resolve_transfer (gfc_code *code)
7537 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
7540 sym = exp->symtree->n.sym;
7543 /* Go to actual component transferred. */
7544 for (ref = code->expr1->ref; ref; ref = ref->next)
7545 if (ref->type == REF_COMPONENT)
7546 ts = &ref->u.c.component->ts;
7548 if (ts->type == BT_DERIVED)
7550 /* Check that transferred derived type doesn't contain POINTER
7552 if (ts->u.derived->attr.pointer_comp)
7554 gfc_error ("Data transfer element at %L cannot have "
7555 "POINTER components", &code->loc);
7559 if (ts->u.derived->attr.alloc_comp)
7561 gfc_error ("Data transfer element at %L cannot have "
7562 "ALLOCATABLE components", &code->loc);
7566 if (derived_inaccessible (ts->u.derived))
7568 gfc_error ("Data transfer element at %L cannot have "
7569 "PRIVATE components",&code->loc);
7574 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
7575 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
7577 gfc_error ("Data transfer element at %L cannot be a full reference to "
7578 "an assumed-size array", &code->loc);
7584 /*********** Toplevel code resolution subroutines ***********/
7586 /* Find the set of labels that are reachable from this block. We also
7587 record the last statement in each block. */
7590 find_reachable_labels (gfc_code *block)
7597 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
7599 /* Collect labels in this block. We don't keep those corresponding
7600 to END {IF|SELECT}, these are checked in resolve_branch by going
7601 up through the code_stack. */
7602 for (c = block; c; c = c->next)
7604 if (c->here && c->op != EXEC_END_BLOCK)
7605 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
7608 /* Merge with labels from parent block. */
7611 gcc_assert (cs_base->prev->reachable_labels);
7612 bitmap_ior_into (cs_base->reachable_labels,
7613 cs_base->prev->reachable_labels);
7619 resolve_sync (gfc_code *code)
7621 /* Check imageset. The * case matches expr1 == NULL. */
7624 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
7625 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
7626 "INTEGER expression", &code->expr1->where);
7627 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
7628 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
7629 gfc_error ("Imageset argument at %L must between 1 and num_images()",
7630 &code->expr1->where);
7631 else if (code->expr1->expr_type == EXPR_ARRAY
7632 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
7634 gfc_constructor *cons;
7635 cons = gfc_constructor_first (code->expr1->value.constructor);
7636 for (; cons; cons = gfc_constructor_next (cons))
7637 if (cons->expr->expr_type == EXPR_CONSTANT
7638 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
7639 gfc_error ("Imageset argument at %L must between 1 and "
7640 "num_images()", &cons->expr->where);
7646 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
7647 || code->expr2->expr_type != EXPR_VARIABLE))
7648 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
7649 &code->expr2->where);
7653 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
7654 || code->expr3->expr_type != EXPR_VARIABLE))
7655 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
7656 &code->expr3->where);
7660 /* Given a branch to a label, see if the branch is conforming.
7661 The code node describes where the branch is located. */
7664 resolve_branch (gfc_st_label *label, gfc_code *code)
7671 /* Step one: is this a valid branching target? */
7673 if (label->defined == ST_LABEL_UNKNOWN)
7675 gfc_error ("Label %d referenced at %L is never defined", label->value,
7680 if (label->defined != ST_LABEL_TARGET)
7682 gfc_error ("Statement at %L is not a valid branch target statement "
7683 "for the branch statement at %L", &label->where, &code->loc);
7687 /* Step two: make sure this branch is not a branch to itself ;-) */
7689 if (code->here == label)
7691 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
7695 /* Step three: See if the label is in the same block as the
7696 branching statement. The hard work has been done by setting up
7697 the bitmap reachable_labels. */
7699 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
7701 /* Check now whether there is a CRITICAL construct; if so, check
7702 whether the label is still visible outside of the CRITICAL block,
7703 which is invalid. */
7704 for (stack = cs_base; stack; stack = stack->prev)
7705 if (stack->current->op == EXEC_CRITICAL
7706 && bitmap_bit_p (stack->reachable_labels, label->value))
7707 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7708 " at %L", &code->loc, &label->where);
7713 /* Step four: If we haven't found the label in the bitmap, it may
7714 still be the label of the END of the enclosing block, in which
7715 case we find it by going up the code_stack. */
7717 for (stack = cs_base; stack; stack = stack->prev)
7719 if (stack->current->next && stack->current->next->here == label)
7721 if (stack->current->op == EXEC_CRITICAL)
7723 /* Note: A label at END CRITICAL does not leave the CRITICAL
7724 construct as END CRITICAL is still part of it. */
7725 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
7726 " at %L", &code->loc, &label->where);
7733 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
7737 /* The label is not in an enclosing block, so illegal. This was
7738 allowed in Fortran 66, so we allow it as extension. No
7739 further checks are necessary in this case. */
7740 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
7741 "as the GOTO statement at %L", &label->where,
7747 /* Check whether EXPR1 has the same shape as EXPR2. */
7750 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
7752 mpz_t shape[GFC_MAX_DIMENSIONS];
7753 mpz_t shape2[GFC_MAX_DIMENSIONS];
7754 gfc_try result = FAILURE;
7757 /* Compare the rank. */
7758 if (expr1->rank != expr2->rank)
7761 /* Compare the size of each dimension. */
7762 for (i=0; i<expr1->rank; i++)
7764 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
7767 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
7770 if (mpz_cmp (shape[i], shape2[i]))
7774 /* When either of the two expression is an assumed size array, we
7775 ignore the comparison of dimension sizes. */
7780 for (i--; i >= 0; i--)
7782 mpz_clear (shape[i]);
7783 mpz_clear (shape2[i]);
7789 /* Check whether a WHERE assignment target or a WHERE mask expression
7790 has the same shape as the outmost WHERE mask expression. */
7793 resolve_where (gfc_code *code, gfc_expr *mask)
7799 cblock = code->block;
7801 /* Store the first WHERE mask-expr of the WHERE statement or construct.
7802 In case of nested WHERE, only the outmost one is stored. */
7803 if (mask == NULL) /* outmost WHERE */
7805 else /* inner WHERE */
7812 /* Check if the mask-expr has a consistent shape with the
7813 outmost WHERE mask-expr. */
7814 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
7815 gfc_error ("WHERE mask at %L has inconsistent shape",
7816 &cblock->expr1->where);
7819 /* the assignment statement of a WHERE statement, or the first
7820 statement in where-body-construct of a WHERE construct */
7821 cnext = cblock->next;
7826 /* WHERE assignment statement */
7829 /* Check shape consistent for WHERE assignment target. */
7830 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
7831 gfc_error ("WHERE assignment target at %L has "
7832 "inconsistent shape", &cnext->expr1->where);
7836 case EXEC_ASSIGN_CALL:
7837 resolve_call (cnext);
7838 if (!cnext->resolved_sym->attr.elemental)
7839 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7840 &cnext->ext.actual->expr->where);
7843 /* WHERE or WHERE construct is part of a where-body-construct */
7845 resolve_where (cnext, e);
7849 gfc_error ("Unsupported statement inside WHERE at %L",
7852 /* the next statement within the same where-body-construct */
7853 cnext = cnext->next;
7855 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7856 cblock = cblock->block;
7861 /* Resolve assignment in FORALL construct.
7862 NVAR is the number of FORALL index variables, and VAR_EXPR records the
7863 FORALL index variables. */
7866 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
7870 for (n = 0; n < nvar; n++)
7872 gfc_symbol *forall_index;
7874 forall_index = var_expr[n]->symtree->n.sym;
7876 /* Check whether the assignment target is one of the FORALL index
7878 if ((code->expr1->expr_type == EXPR_VARIABLE)
7879 && (code->expr1->symtree->n.sym == forall_index))
7880 gfc_error ("Assignment to a FORALL index variable at %L",
7881 &code->expr1->where);
7884 /* If one of the FORALL index variables doesn't appear in the
7885 assignment variable, then there could be a many-to-one
7886 assignment. Emit a warning rather than an error because the
7887 mask could be resolving this problem. */
7888 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
7889 gfc_warning ("The FORALL with index '%s' is not used on the "
7890 "left side of the assignment at %L and so might "
7891 "cause multiple assignment to this object",
7892 var_expr[n]->symtree->name, &code->expr1->where);
7898 /* Resolve WHERE statement in FORALL construct. */
7901 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
7902 gfc_expr **var_expr)
7907 cblock = code->block;
7910 /* the assignment statement of a WHERE statement, or the first
7911 statement in where-body-construct of a WHERE construct */
7912 cnext = cblock->next;
7917 /* WHERE assignment statement */
7919 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
7922 /* WHERE operator assignment statement */
7923 case EXEC_ASSIGN_CALL:
7924 resolve_call (cnext);
7925 if (!cnext->resolved_sym->attr.elemental)
7926 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
7927 &cnext->ext.actual->expr->where);
7930 /* WHERE or WHERE construct is part of a where-body-construct */
7932 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
7936 gfc_error ("Unsupported statement inside WHERE at %L",
7939 /* the next statement within the same where-body-construct */
7940 cnext = cnext->next;
7942 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
7943 cblock = cblock->block;
7948 /* Traverse the FORALL body to check whether the following errors exist:
7949 1. For assignment, check if a many-to-one assignment happens.
7950 2. For WHERE statement, check the WHERE body to see if there is any
7951 many-to-one assignment. */
7954 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
7958 c = code->block->next;
7964 case EXEC_POINTER_ASSIGN:
7965 gfc_resolve_assign_in_forall (c, nvar, var_expr);
7968 case EXEC_ASSIGN_CALL:
7972 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
7973 there is no need to handle it here. */
7977 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
7982 /* The next statement in the FORALL body. */
7988 /* Counts the number of iterators needed inside a forall construct, including
7989 nested forall constructs. This is used to allocate the needed memory
7990 in gfc_resolve_forall. */
7993 gfc_count_forall_iterators (gfc_code *code)
7995 int max_iters, sub_iters, current_iters;
7996 gfc_forall_iterator *fa;
7998 gcc_assert(code->op == EXEC_FORALL);
8002 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8005 code = code->block->next;
8009 if (code->op == EXEC_FORALL)
8011 sub_iters = gfc_count_forall_iterators (code);
8012 if (sub_iters > max_iters)
8013 max_iters = sub_iters;
8018 return current_iters + max_iters;
8022 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8023 gfc_resolve_forall_body to resolve the FORALL body. */
8026 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8028 static gfc_expr **var_expr;
8029 static int total_var = 0;
8030 static int nvar = 0;
8032 gfc_forall_iterator *fa;
8037 /* Start to resolve a FORALL construct */
8038 if (forall_save == 0)
8040 /* Count the total number of FORALL index in the nested FORALL
8041 construct in order to allocate the VAR_EXPR with proper size. */
8042 total_var = gfc_count_forall_iterators (code);
8044 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8045 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
8048 /* The information about FORALL iterator, including FORALL index start, end
8049 and stride. The FORALL index can not appear in start, end or stride. */
8050 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8052 /* Check if any outer FORALL index name is the same as the current
8054 for (i = 0; i < nvar; i++)
8056 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8058 gfc_error ("An outer FORALL construct already has an index "
8059 "with this name %L", &fa->var->where);
8063 /* Record the current FORALL index. */
8064 var_expr[nvar] = gfc_copy_expr (fa->var);
8068 /* No memory leak. */
8069 gcc_assert (nvar <= total_var);
8072 /* Resolve the FORALL body. */
8073 gfc_resolve_forall_body (code, nvar, var_expr);
8075 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8076 gfc_resolve_blocks (code->block, ns);
8080 /* Free only the VAR_EXPRs allocated in this frame. */
8081 for (i = nvar; i < tmp; i++)
8082 gfc_free_expr (var_expr[i]);
8086 /* We are in the outermost FORALL construct. */
8087 gcc_assert (forall_save == 0);
8089 /* VAR_EXPR is not needed any more. */
8090 gfc_free (var_expr);
8096 /* Resolve a BLOCK construct statement. */
8099 resolve_block_construct (gfc_code* code)
8101 /* For an ASSOCIATE block, the associations (and their targets) are already
8102 resolved during gfc_resolve_symbol. */
8104 /* Resolve the BLOCK's namespace. */
8105 gfc_resolve (code->ext.block.ns);
8109 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8112 static void resolve_code (gfc_code *, gfc_namespace *);
8115 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8119 for (; b; b = b->block)
8121 t = gfc_resolve_expr (b->expr1);
8122 if (gfc_resolve_expr (b->expr2) == FAILURE)
8128 if (t == SUCCESS && b->expr1 != NULL
8129 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8130 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8137 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8138 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8143 resolve_branch (b->label1, b);
8147 resolve_block_construct (b);
8151 case EXEC_SELECT_TYPE:
8162 case EXEC_OMP_ATOMIC:
8163 case EXEC_OMP_CRITICAL:
8165 case EXEC_OMP_MASTER:
8166 case EXEC_OMP_ORDERED:
8167 case EXEC_OMP_PARALLEL:
8168 case EXEC_OMP_PARALLEL_DO:
8169 case EXEC_OMP_PARALLEL_SECTIONS:
8170 case EXEC_OMP_PARALLEL_WORKSHARE:
8171 case EXEC_OMP_SECTIONS:
8172 case EXEC_OMP_SINGLE:
8174 case EXEC_OMP_TASKWAIT:
8175 case EXEC_OMP_WORKSHARE:
8179 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8182 resolve_code (b->next, ns);
8187 /* Does everything to resolve an ordinary assignment. Returns true
8188 if this is an interface assignment. */
8190 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8200 if (gfc_extend_assign (code, ns) == SUCCESS)
8204 if (code->op == EXEC_ASSIGN_CALL)
8206 lhs = code->ext.actual->expr;
8207 rhsptr = &code->ext.actual->next->expr;
8211 gfc_actual_arglist* args;
8212 gfc_typebound_proc* tbp;
8214 gcc_assert (code->op == EXEC_COMPCALL);
8216 args = code->expr1->value.compcall.actual;
8218 rhsptr = &args->next->expr;
8220 tbp = code->expr1->value.compcall.tbp;
8221 gcc_assert (!tbp->is_generic);
8224 /* Make a temporary rhs when there is a default initializer
8225 and rhs is the same symbol as the lhs. */
8226 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8227 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8228 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8229 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8230 *rhsptr = gfc_get_parentheses (*rhsptr);
8239 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8240 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8241 &code->loc) == FAILURE)
8244 /* Handle the case of a BOZ literal on the RHS. */
8245 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8248 if (gfc_option.warn_surprising)
8249 gfc_warning ("BOZ literal at %L is bitwise transferred "
8250 "non-integer symbol '%s'", &code->loc,
8251 lhs->symtree->n.sym->name);
8253 if (!gfc_convert_boz (rhs, &lhs->ts))
8255 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8257 if (rc == ARITH_UNDERFLOW)
8258 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8259 ". This check can be disabled with the option "
8260 "-fno-range-check", &rhs->where);
8261 else if (rc == ARITH_OVERFLOW)
8262 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8263 ". This check can be disabled with the option "
8264 "-fno-range-check", &rhs->where);
8265 else if (rc == ARITH_NAN)
8266 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8267 ". This check can be disabled with the option "
8268 "-fno-range-check", &rhs->where);
8274 if (lhs->ts.type == BT_CHARACTER
8275 && gfc_option.warn_character_truncation)
8277 if (lhs->ts.u.cl != NULL
8278 && lhs->ts.u.cl->length != NULL
8279 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8280 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8282 if (rhs->expr_type == EXPR_CONSTANT)
8283 rlen = rhs->value.character.length;
8285 else if (rhs->ts.u.cl != NULL
8286 && rhs->ts.u.cl->length != NULL
8287 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8288 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8290 if (rlen && llen && rlen > llen)
8291 gfc_warning_now ("CHARACTER expression will be truncated "
8292 "in assignment (%d/%d) at %L",
8293 llen, rlen, &code->loc);
8296 /* Ensure that a vector index expression for the lvalue is evaluated
8297 to a temporary if the lvalue symbol is referenced in it. */
8300 for (ref = lhs->ref; ref; ref= ref->next)
8301 if (ref->type == REF_ARRAY)
8303 for (n = 0; n < ref->u.ar.dimen; n++)
8304 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8305 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8306 ref->u.ar.start[n]))
8308 = gfc_get_parentheses (ref->u.ar.start[n]);
8312 if (gfc_pure (NULL))
8314 if (gfc_impure_variable (lhs->symtree->n.sym))
8316 gfc_error ("Cannot assign to variable '%s' in PURE "
8318 lhs->symtree->n.sym->name,
8323 if (lhs->ts.type == BT_DERIVED
8324 && lhs->expr_type == EXPR_VARIABLE
8325 && lhs->ts.u.derived->attr.pointer_comp
8326 && rhs->expr_type == EXPR_VARIABLE
8327 && (gfc_impure_variable (rhs->symtree->n.sym)
8328 || gfc_is_coindexed (rhs)))
8331 if (gfc_is_coindexed (rhs))
8332 gfc_error ("Coindexed expression at %L is assigned to "
8333 "a derived type variable with a POINTER "
8334 "component in a PURE procedure",
8337 gfc_error ("The impure variable at %L is assigned to "
8338 "a derived type variable with a POINTER "
8339 "component in a PURE procedure (12.6)",
8344 /* Fortran 2008, C1283. */
8345 if (gfc_is_coindexed (lhs))
8347 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8348 "procedure", &rhs->where);
8354 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8355 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8356 if (lhs->ts.type == BT_CLASS)
8358 gfc_error ("Variable must not be polymorphic in assignment at %L",
8363 /* F2008, Section 7.2.1.2. */
8364 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8366 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8367 "component in assignment at %L", &lhs->where);
8371 gfc_check_assign (lhs, rhs, 1);
8376 /* Given a block of code, recursively resolve everything pointed to by this
8380 resolve_code (gfc_code *code, gfc_namespace *ns)
8382 int omp_workshare_save;
8387 frame.prev = cs_base;
8391 find_reachable_labels (code);
8393 for (; code; code = code->next)
8395 frame.current = code;
8396 forall_save = forall_flag;
8398 if (code->op == EXEC_FORALL)
8401 gfc_resolve_forall (code, ns, forall_save);
8404 else if (code->block)
8406 omp_workshare_save = -1;
8409 case EXEC_OMP_PARALLEL_WORKSHARE:
8410 omp_workshare_save = omp_workshare_flag;
8411 omp_workshare_flag = 1;
8412 gfc_resolve_omp_parallel_blocks (code, ns);
8414 case EXEC_OMP_PARALLEL:
8415 case EXEC_OMP_PARALLEL_DO:
8416 case EXEC_OMP_PARALLEL_SECTIONS:
8418 omp_workshare_save = omp_workshare_flag;
8419 omp_workshare_flag = 0;
8420 gfc_resolve_omp_parallel_blocks (code, ns);
8423 gfc_resolve_omp_do_blocks (code, ns);
8425 case EXEC_SELECT_TYPE:
8426 gfc_current_ns = code->ext.block.ns;
8427 gfc_resolve_blocks (code->block, gfc_current_ns);
8428 gfc_current_ns = ns;
8430 case EXEC_OMP_WORKSHARE:
8431 omp_workshare_save = omp_workshare_flag;
8432 omp_workshare_flag = 1;
8435 gfc_resolve_blocks (code->block, ns);
8439 if (omp_workshare_save != -1)
8440 omp_workshare_flag = omp_workshare_save;
8444 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
8445 t = gfc_resolve_expr (code->expr1);
8446 forall_flag = forall_save;
8448 if (gfc_resolve_expr (code->expr2) == FAILURE)
8451 if (code->op == EXEC_ALLOCATE
8452 && gfc_resolve_expr (code->expr3) == FAILURE)
8458 case EXEC_END_BLOCK:
8462 case EXEC_ERROR_STOP:
8466 case EXEC_ASSIGN_CALL:
8471 case EXEC_SYNC_IMAGES:
8472 case EXEC_SYNC_MEMORY:
8473 resolve_sync (code);
8477 /* Keep track of which entry we are up to. */
8478 current_entry_id = code->ext.entry->id;
8482 resolve_where (code, NULL);
8486 if (code->expr1 != NULL)
8488 if (code->expr1->ts.type != BT_INTEGER)
8489 gfc_error ("ASSIGNED GOTO statement at %L requires an "
8490 "INTEGER variable", &code->expr1->where);
8491 else if (code->expr1->symtree->n.sym->attr.assign != 1)
8492 gfc_error ("Variable '%s' has not been assigned a target "
8493 "label at %L", code->expr1->symtree->n.sym->name,
8494 &code->expr1->where);
8497 resolve_branch (code->label1, code);
8501 if (code->expr1 != NULL
8502 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
8503 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
8504 "INTEGER return specifier", &code->expr1->where);
8507 case EXEC_INIT_ASSIGN:
8508 case EXEC_END_PROCEDURE:
8515 if (resolve_ordinary_assign (code, ns))
8517 if (code->op == EXEC_COMPCALL)
8524 case EXEC_LABEL_ASSIGN:
8525 if (code->label1->defined == ST_LABEL_UNKNOWN)
8526 gfc_error ("Label %d referenced at %L is never defined",
8527 code->label1->value, &code->label1->where);
8529 && (code->expr1->expr_type != EXPR_VARIABLE
8530 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
8531 || code->expr1->symtree->n.sym->ts.kind
8532 != gfc_default_integer_kind
8533 || code->expr1->symtree->n.sym->as != NULL))
8534 gfc_error ("ASSIGN statement at %L requires a scalar "
8535 "default INTEGER variable", &code->expr1->where);
8538 case EXEC_POINTER_ASSIGN:
8542 gfc_check_pointer_assign (code->expr1, code->expr2);
8545 case EXEC_ARITHMETIC_IF:
8547 && code->expr1->ts.type != BT_INTEGER
8548 && code->expr1->ts.type != BT_REAL)
8549 gfc_error ("Arithmetic IF statement at %L requires a numeric "
8550 "expression", &code->expr1->where);
8552 resolve_branch (code->label1, code);
8553 resolve_branch (code->label2, code);
8554 resolve_branch (code->label3, code);
8558 if (t == SUCCESS && code->expr1 != NULL
8559 && (code->expr1->ts.type != BT_LOGICAL
8560 || code->expr1->rank != 0))
8561 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8562 &code->expr1->where);
8567 resolve_call (code);
8572 resolve_typebound_subroutine (code);
8576 resolve_ppc_call (code);
8580 /* Select is complicated. Also, a SELECT construct could be
8581 a transformed computed GOTO. */
8582 resolve_select (code);
8585 case EXEC_SELECT_TYPE:
8586 resolve_select_type (code);
8590 gfc_resolve (code->ext.block.ns);
8594 if (code->ext.iterator != NULL)
8596 gfc_iterator *iter = code->ext.iterator;
8597 if (gfc_resolve_iterator (iter, true) != FAILURE)
8598 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
8603 if (code->expr1 == NULL)
8604 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
8606 && (code->expr1->rank != 0
8607 || code->expr1->ts.type != BT_LOGICAL))
8608 gfc_error ("Exit condition of DO WHILE loop at %L must be "
8609 "a scalar LOGICAL expression", &code->expr1->where);
8614 resolve_allocate_deallocate (code, "ALLOCATE");
8618 case EXEC_DEALLOCATE:
8620 resolve_allocate_deallocate (code, "DEALLOCATE");
8625 if (gfc_resolve_open (code->ext.open) == FAILURE)
8628 resolve_branch (code->ext.open->err, code);
8632 if (gfc_resolve_close (code->ext.close) == FAILURE)
8635 resolve_branch (code->ext.close->err, code);
8638 case EXEC_BACKSPACE:
8642 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
8645 resolve_branch (code->ext.filepos->err, code);
8649 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8652 resolve_branch (code->ext.inquire->err, code);
8656 gcc_assert (code->ext.inquire != NULL);
8657 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
8660 resolve_branch (code->ext.inquire->err, code);
8664 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
8667 resolve_branch (code->ext.wait->err, code);
8668 resolve_branch (code->ext.wait->end, code);
8669 resolve_branch (code->ext.wait->eor, code);
8674 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
8677 resolve_branch (code->ext.dt->err, code);
8678 resolve_branch (code->ext.dt->end, code);
8679 resolve_branch (code->ext.dt->eor, code);
8683 resolve_transfer (code);
8687 resolve_forall_iterators (code->ext.forall_iterator);
8689 if (code->expr1 != NULL && code->expr1->ts.type != BT_LOGICAL)
8690 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
8691 "expression", &code->expr1->where);
8694 case EXEC_OMP_ATOMIC:
8695 case EXEC_OMP_BARRIER:
8696 case EXEC_OMP_CRITICAL:
8697 case EXEC_OMP_FLUSH:
8699 case EXEC_OMP_MASTER:
8700 case EXEC_OMP_ORDERED:
8701 case EXEC_OMP_SECTIONS:
8702 case EXEC_OMP_SINGLE:
8703 case EXEC_OMP_TASKWAIT:
8704 case EXEC_OMP_WORKSHARE:
8705 gfc_resolve_omp_directive (code, ns);
8708 case EXEC_OMP_PARALLEL:
8709 case EXEC_OMP_PARALLEL_DO:
8710 case EXEC_OMP_PARALLEL_SECTIONS:
8711 case EXEC_OMP_PARALLEL_WORKSHARE:
8713 omp_workshare_save = omp_workshare_flag;
8714 omp_workshare_flag = 0;
8715 gfc_resolve_omp_directive (code, ns);
8716 omp_workshare_flag = omp_workshare_save;
8720 gfc_internal_error ("resolve_code(): Bad statement code");
8724 cs_base = frame.prev;
8728 /* Resolve initial values and make sure they are compatible with
8732 resolve_values (gfc_symbol *sym)
8734 if (sym->value == NULL)
8737 if (gfc_resolve_expr (sym->value) == FAILURE)
8740 gfc_check_assign_symbol (sym, sym->value);
8744 /* Verify the binding labels for common blocks that are BIND(C). The label
8745 for a BIND(C) common block must be identical in all scoping units in which
8746 the common block is declared. Further, the binding label can not collide
8747 with any other global entity in the program. */
8750 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
8752 if (comm_block_tree->n.common->is_bind_c == 1)
8754 gfc_gsymbol *binding_label_gsym;
8755 gfc_gsymbol *comm_name_gsym;
8757 /* See if a global symbol exists by the common block's name. It may
8758 be NULL if the common block is use-associated. */
8759 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
8760 comm_block_tree->n.common->name);
8761 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
8762 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
8763 "with the global entity '%s' at %L",
8764 comm_block_tree->n.common->binding_label,
8765 comm_block_tree->n.common->name,
8766 &(comm_block_tree->n.common->where),
8767 comm_name_gsym->name, &(comm_name_gsym->where));
8768 else if (comm_name_gsym != NULL
8769 && strcmp (comm_name_gsym->name,
8770 comm_block_tree->n.common->name) == 0)
8772 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
8774 if (comm_name_gsym->binding_label == NULL)
8775 /* No binding label for common block stored yet; save this one. */
8776 comm_name_gsym->binding_label =
8777 comm_block_tree->n.common->binding_label;
8779 if (strcmp (comm_name_gsym->binding_label,
8780 comm_block_tree->n.common->binding_label) != 0)
8782 /* Common block names match but binding labels do not. */
8783 gfc_error ("Binding label '%s' for common block '%s' at %L "
8784 "does not match the binding label '%s' for common "
8786 comm_block_tree->n.common->binding_label,
8787 comm_block_tree->n.common->name,
8788 &(comm_block_tree->n.common->where),
8789 comm_name_gsym->binding_label,
8790 comm_name_gsym->name,
8791 &(comm_name_gsym->where));
8796 /* There is no binding label (NAME="") so we have nothing further to
8797 check and nothing to add as a global symbol for the label. */
8798 if (comm_block_tree->n.common->binding_label[0] == '\0' )
8801 binding_label_gsym =
8802 gfc_find_gsymbol (gfc_gsym_root,
8803 comm_block_tree->n.common->binding_label);
8804 if (binding_label_gsym == NULL)
8806 /* Need to make a global symbol for the binding label to prevent
8807 it from colliding with another. */
8808 binding_label_gsym =
8809 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
8810 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
8811 binding_label_gsym->type = GSYM_COMMON;
8815 /* If comm_name_gsym is NULL, the name common block is use
8816 associated and the name could be colliding. */
8817 if (binding_label_gsym->type != GSYM_COMMON)
8818 gfc_error ("Binding label '%s' for common block '%s' at %L "
8819 "collides with the global entity '%s' at %L",
8820 comm_block_tree->n.common->binding_label,
8821 comm_block_tree->n.common->name,
8822 &(comm_block_tree->n.common->where),
8823 binding_label_gsym->name,
8824 &(binding_label_gsym->where));
8825 else if (comm_name_gsym != NULL
8826 && (strcmp (binding_label_gsym->name,
8827 comm_name_gsym->binding_label) != 0)
8828 && (strcmp (binding_label_gsym->sym_name,
8829 comm_name_gsym->name) != 0))
8830 gfc_error ("Binding label '%s' for common block '%s' at %L "
8831 "collides with global entity '%s' at %L",
8832 binding_label_gsym->name, binding_label_gsym->sym_name,
8833 &(comm_block_tree->n.common->where),
8834 comm_name_gsym->name, &(comm_name_gsym->where));
8842 /* Verify any BIND(C) derived types in the namespace so we can report errors
8843 for them once, rather than for each variable declared of that type. */
8846 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
8848 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
8849 && derived_sym->attr.is_bind_c == 1)
8850 verify_bind_c_derived_type (derived_sym);
8856 /* Verify that any binding labels used in a given namespace do not collide
8857 with the names or binding labels of any global symbols. */
8860 gfc_verify_binding_labels (gfc_symbol *sym)
8864 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
8865 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
8867 gfc_gsymbol *bind_c_sym;
8869 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
8870 if (bind_c_sym != NULL
8871 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
8873 if (sym->attr.if_source == IFSRC_DECL
8874 && (bind_c_sym->type != GSYM_SUBROUTINE
8875 && bind_c_sym->type != GSYM_FUNCTION)
8876 && ((sym->attr.contained == 1
8877 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
8878 || (sym->attr.use_assoc == 1
8879 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
8881 /* Make sure global procedures don't collide with anything. */
8882 gfc_error ("Binding label '%s' at %L collides with the global "
8883 "entity '%s' at %L", sym->binding_label,
8884 &(sym->declared_at), bind_c_sym->name,
8885 &(bind_c_sym->where));
8888 else if (sym->attr.contained == 0
8889 && (sym->attr.if_source == IFSRC_IFBODY
8890 && sym->attr.flavor == FL_PROCEDURE)
8891 && (bind_c_sym->sym_name != NULL
8892 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
8894 /* Make sure procedures in interface bodies don't collide. */
8895 gfc_error ("Binding label '%s' in interface body at %L collides "
8896 "with the global entity '%s' at %L",
8898 &(sym->declared_at), bind_c_sym->name,
8899 &(bind_c_sym->where));
8902 else if (sym->attr.contained == 0
8903 && sym->attr.if_source == IFSRC_UNKNOWN)
8904 if ((sym->attr.use_assoc && bind_c_sym->mod_name
8905 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
8906 || sym->attr.use_assoc == 0)
8908 gfc_error ("Binding label '%s' at %L collides with global "
8909 "entity '%s' at %L", sym->binding_label,
8910 &(sym->declared_at), bind_c_sym->name,
8911 &(bind_c_sym->where));
8916 /* Clear the binding label to prevent checking multiple times. */
8917 sym->binding_label[0] = '\0';
8919 else if (bind_c_sym == NULL)
8921 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
8922 bind_c_sym->where = sym->declared_at;
8923 bind_c_sym->sym_name = sym->name;
8925 if (sym->attr.use_assoc == 1)
8926 bind_c_sym->mod_name = sym->module;
8928 if (sym->ns->proc_name != NULL)
8929 bind_c_sym->mod_name = sym->ns->proc_name->name;
8931 if (sym->attr.contained == 0)
8933 if (sym->attr.subroutine)
8934 bind_c_sym->type = GSYM_SUBROUTINE;
8935 else if (sym->attr.function)
8936 bind_c_sym->type = GSYM_FUNCTION;
8944 /* Resolve an index expression. */
8947 resolve_index_expr (gfc_expr *e)
8949 if (gfc_resolve_expr (e) == FAILURE)
8952 if (gfc_simplify_expr (e, 0) == FAILURE)
8955 if (gfc_specification_expr (e) == FAILURE)
8961 /* Resolve a charlen structure. */
8964 resolve_charlen (gfc_charlen *cl)
8973 specification_expr = 1;
8975 if (resolve_index_expr (cl->length) == FAILURE)
8977 specification_expr = 0;
8981 /* "If the character length parameter value evaluates to a negative
8982 value, the length of character entities declared is zero." */
8983 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
8985 if (gfc_option.warn_surprising)
8986 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
8987 " the length has been set to zero",
8988 &cl->length->where, i);
8989 gfc_replace_expr (cl->length,
8990 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
8993 /* Check that the character length is not too large. */
8994 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
8995 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
8996 && cl->length->ts.type == BT_INTEGER
8997 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
8999 gfc_error ("String length at %L is too large", &cl->length->where);
9007 /* Test for non-constant shape arrays. */
9010 is_non_constant_shape_array (gfc_symbol *sym)
9016 not_constant = false;
9017 if (sym->as != NULL)
9019 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9020 has not been simplified; parameter array references. Do the
9021 simplification now. */
9022 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9024 e = sym->as->lower[i];
9025 if (e && (resolve_index_expr (e) == FAILURE
9026 || !gfc_is_constant_expr (e)))
9027 not_constant = true;
9028 e = sym->as->upper[i];
9029 if (e && (resolve_index_expr (e) == FAILURE
9030 || !gfc_is_constant_expr (e)))
9031 not_constant = true;
9034 return not_constant;
9037 /* Given a symbol and an initialization expression, add code to initialize
9038 the symbol to the function entry. */
9040 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9044 gfc_namespace *ns = sym->ns;
9046 /* Search for the function namespace if this is a contained
9047 function without an explicit result. */
9048 if (sym->attr.function && sym == sym->result
9049 && sym->name != sym->ns->proc_name->name)
9052 for (;ns; ns = ns->sibling)
9053 if (strcmp (ns->proc_name->name, sym->name) == 0)
9059 gfc_free_expr (init);
9063 /* Build an l-value expression for the result. */
9064 lval = gfc_lval_expr_from_sym (sym);
9066 /* Add the code at scope entry. */
9067 init_st = gfc_get_code ();
9068 init_st->next = ns->code;
9071 /* Assign the default initializer to the l-value. */
9072 init_st->loc = sym->declared_at;
9073 init_st->op = EXEC_INIT_ASSIGN;
9074 init_st->expr1 = lval;
9075 init_st->expr2 = init;
9078 /* Assign the default initializer to a derived type variable or result. */
9081 apply_default_init (gfc_symbol *sym)
9083 gfc_expr *init = NULL;
9085 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9088 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9089 init = gfc_default_initializer (&sym->ts);
9094 build_init_assign (sym, init);
9097 /* Build an initializer for a local integer, real, complex, logical, or
9098 character variable, based on the command line flags finit-local-zero,
9099 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9100 null if the symbol should not have a default initialization. */
9102 build_default_init_expr (gfc_symbol *sym)
9105 gfc_expr *init_expr;
9108 /* These symbols should never have a default initialization. */
9109 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9110 || sym->attr.external
9112 || sym->attr.pointer
9113 || sym->attr.in_equivalence
9114 || sym->attr.in_common
9117 || sym->attr.cray_pointee
9118 || sym->attr.cray_pointer)
9121 /* Now we'll try to build an initializer expression. */
9122 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9125 /* We will only initialize integers, reals, complex, logicals, and
9126 characters, and only if the corresponding command-line flags
9127 were set. Otherwise, we free init_expr and return null. */
9128 switch (sym->ts.type)
9131 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9132 mpz_init_set_si (init_expr->value.integer,
9133 gfc_option.flag_init_integer_value);
9136 gfc_free_expr (init_expr);
9142 mpfr_init (init_expr->value.real);
9143 switch (gfc_option.flag_init_real)
9145 case GFC_INIT_REAL_SNAN:
9146 init_expr->is_snan = 1;
9148 case GFC_INIT_REAL_NAN:
9149 mpfr_set_nan (init_expr->value.real);
9152 case GFC_INIT_REAL_INF:
9153 mpfr_set_inf (init_expr->value.real, 1);
9156 case GFC_INIT_REAL_NEG_INF:
9157 mpfr_set_inf (init_expr->value.real, -1);
9160 case GFC_INIT_REAL_ZERO:
9161 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9165 gfc_free_expr (init_expr);
9172 mpc_init2 (init_expr->value.complex, mpfr_get_default_prec());
9173 switch (gfc_option.flag_init_real)
9175 case GFC_INIT_REAL_SNAN:
9176 init_expr->is_snan = 1;
9178 case GFC_INIT_REAL_NAN:
9179 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9180 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9183 case GFC_INIT_REAL_INF:
9184 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9185 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9188 case GFC_INIT_REAL_NEG_INF:
9189 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9190 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9193 case GFC_INIT_REAL_ZERO:
9194 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9198 gfc_free_expr (init_expr);
9205 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9206 init_expr->value.logical = 0;
9207 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9208 init_expr->value.logical = 1;
9211 gfc_free_expr (init_expr);
9217 /* For characters, the length must be constant in order to
9218 create a default initializer. */
9219 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9220 && sym->ts.u.cl->length
9221 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9223 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9224 init_expr->value.character.length = char_len;
9225 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9226 for (i = 0; i < char_len; i++)
9227 init_expr->value.character.string[i]
9228 = (unsigned char) gfc_option.flag_init_character_value;
9232 gfc_free_expr (init_expr);
9238 gfc_free_expr (init_expr);
9244 /* Add an initialization expression to a local variable. */
9246 apply_default_init_local (gfc_symbol *sym)
9248 gfc_expr *init = NULL;
9250 /* The symbol should be a variable or a function return value. */
9251 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9252 || (sym->attr.function && sym->result != sym))
9255 /* Try to build the initializer expression. If we can't initialize
9256 this symbol, then init will be NULL. */
9257 init = build_default_init_expr (sym);
9261 /* For saved variables, we don't want to add an initializer at
9262 function entry, so we just add a static initializer. */
9263 if (sym->attr.save || sym->ns->save_all
9264 || gfc_option.flag_max_stack_var_size == 0)
9266 /* Don't clobber an existing initializer! */
9267 gcc_assert (sym->value == NULL);
9272 build_init_assign (sym, init);
9275 /* Resolution of common features of flavors variable and procedure. */
9278 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9280 /* Constraints on deferred shape variable. */
9281 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9283 if (sym->attr.allocatable)
9285 if (sym->attr.dimension)
9287 gfc_error ("Allocatable array '%s' at %L must have "
9288 "a deferred shape", sym->name, &sym->declared_at);
9291 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9292 "may not be ALLOCATABLE", sym->name,
9293 &sym->declared_at) == FAILURE)
9297 if (sym->attr.pointer && sym->attr.dimension)
9299 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9300 sym->name, &sym->declared_at);
9307 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9308 && !sym->attr.dummy && sym->ts.type != BT_CLASS)
9310 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9311 sym->name, &sym->declared_at);
9316 /* Constraints on polymorphic variables. */
9317 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9320 if (!gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9322 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9323 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9329 /* Assume that use associated symbols were checked in the module ns. */
9330 if (!sym->attr.class_ok && !sym->attr.use_assoc)
9332 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9333 "or pointer", sym->name, &sym->declared_at);
9342 /* Additional checks for symbols with flavor variable and derived
9343 type. To be called from resolve_fl_variable. */
9346 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9348 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9350 /* Check to see if a derived type is blocked from being host
9351 associated by the presence of another class I symbol in the same
9352 namespace. 14.6.1.3 of the standard and the discussion on
9353 comp.lang.fortran. */
9354 if (sym->ns != sym->ts.u.derived->ns
9355 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9358 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9359 if (s && s->attr.flavor != FL_DERIVED)
9361 gfc_error ("The type '%s' cannot be host associated at %L "
9362 "because it is blocked by an incompatible object "
9363 "of the same name declared at %L",
9364 sym->ts.u.derived->name, &sym->declared_at,
9370 /* 4th constraint in section 11.3: "If an object of a type for which
9371 component-initialization is specified (R429) appears in the
9372 specification-part of a module and does not have the ALLOCATABLE
9373 or POINTER attribute, the object shall have the SAVE attribute."
9375 The check for initializers is performed with
9376 gfc_has_default_initializer because gfc_default_initializer generates
9377 a hidden default for allocatable components. */
9378 if (!(sym->value || no_init_flag) && sym->ns->proc_name
9379 && sym->ns->proc_name->attr.flavor == FL_MODULE
9380 && !sym->ns->save_all && !sym->attr.save
9381 && !sym->attr.pointer && !sym->attr.allocatable
9382 && gfc_has_default_initializer (sym->ts.u.derived)
9383 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
9384 "module variable '%s' at %L, needed due to "
9385 "the default initialization", sym->name,
9386 &sym->declared_at) == FAILURE)
9389 /* Assign default initializer. */
9390 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
9391 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
9393 sym->value = gfc_default_initializer (&sym->ts);
9400 /* Resolve symbols with flavor variable. */
9403 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
9405 int no_init_flag, automatic_flag;
9407 const char *auto_save_msg;
9409 auto_save_msg = "Automatic object '%s' at %L cannot have the "
9412 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9415 /* Set this flag to check that variables are parameters of all entries.
9416 This check is effected by the call to gfc_resolve_expr through
9417 is_non_constant_shape_array. */
9418 specification_expr = 1;
9420 if (sym->ns->proc_name
9421 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9422 || sym->ns->proc_name->attr.is_main_program)
9423 && !sym->attr.use_assoc
9424 && !sym->attr.allocatable
9425 && !sym->attr.pointer
9426 && is_non_constant_shape_array (sym))
9428 /* The shape of a main program or module array needs to be
9430 gfc_error ("The module or main program array '%s' at %L must "
9431 "have constant shape", sym->name, &sym->declared_at);
9432 specification_expr = 0;
9436 if (sym->ts.type == BT_CHARACTER)
9438 /* Make sure that character string variables with assumed length are
9440 e = sym->ts.u.cl->length;
9441 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
9443 gfc_error ("Entity with assumed character length at %L must be a "
9444 "dummy argument or a PARAMETER", &sym->declared_at);
9448 if (e && sym->attr.save && !gfc_is_constant_expr (e))
9450 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9454 if (!gfc_is_constant_expr (e)
9455 && !(e->expr_type == EXPR_VARIABLE
9456 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
9457 && sym->ns->proc_name
9458 && (sym->ns->proc_name->attr.flavor == FL_MODULE
9459 || sym->ns->proc_name->attr.is_main_program)
9460 && !sym->attr.use_assoc)
9462 gfc_error ("'%s' at %L must have constant character length "
9463 "in this context", sym->name, &sym->declared_at);
9468 if (sym->value == NULL && sym->attr.referenced)
9469 apply_default_init_local (sym); /* Try to apply a default initialization. */
9471 /* Determine if the symbol may not have an initializer. */
9472 no_init_flag = automatic_flag = 0;
9473 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
9474 || sym->attr.intrinsic || sym->attr.result)
9476 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
9477 && is_non_constant_shape_array (sym))
9479 no_init_flag = automatic_flag = 1;
9481 /* Also, they must not have the SAVE attribute.
9482 SAVE_IMPLICIT is checked below. */
9483 if (sym->attr.save == SAVE_EXPLICIT)
9485 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
9490 /* Ensure that any initializer is simplified. */
9492 gfc_simplify_expr (sym->value, 1);
9494 /* Reject illegal initializers. */
9495 if (!sym->mark && sym->value)
9497 if (sym->attr.allocatable)
9498 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
9499 sym->name, &sym->declared_at);
9500 else if (sym->attr.external)
9501 gfc_error ("External '%s' at %L cannot have an initializer",
9502 sym->name, &sym->declared_at);
9503 else if (sym->attr.dummy
9504 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
9505 gfc_error ("Dummy '%s' at %L cannot have an initializer",
9506 sym->name, &sym->declared_at);
9507 else if (sym->attr.intrinsic)
9508 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
9509 sym->name, &sym->declared_at);
9510 else if (sym->attr.result)
9511 gfc_error ("Function result '%s' at %L cannot have an initializer",
9512 sym->name, &sym->declared_at);
9513 else if (automatic_flag)
9514 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
9515 sym->name, &sym->declared_at);
9522 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
9523 return resolve_fl_variable_derived (sym, no_init_flag);
9529 /* Resolve a procedure. */
9532 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
9534 gfc_formal_arglist *arg;
9536 if (sym->attr.function
9537 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
9540 if (sym->ts.type == BT_CHARACTER)
9542 gfc_charlen *cl = sym->ts.u.cl;
9544 if (cl && cl->length && gfc_is_constant_expr (cl->length)
9545 && resolve_charlen (cl) == FAILURE)
9548 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
9549 && sym->attr.proc == PROC_ST_FUNCTION)
9551 gfc_error ("Character-valued statement function '%s' at %L must "
9552 "have constant length", sym->name, &sym->declared_at);
9557 /* Ensure that derived type for are not of a private type. Internal
9558 module procedures are excluded by 2.2.3.3 - i.e., they are not
9559 externally accessible and can access all the objects accessible in
9561 if (!(sym->ns->parent
9562 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
9563 && gfc_check_access(sym->attr.access, sym->ns->default_access))
9565 gfc_interface *iface;
9567 for (arg = sym->formal; arg; arg = arg->next)
9570 && arg->sym->ts.type == BT_DERIVED
9571 && !arg->sym->ts.u.derived->attr.use_assoc
9572 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9573 arg->sym->ts.u.derived->ns->default_access)
9574 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
9575 "PRIVATE type and cannot be a dummy argument"
9576 " of '%s', which is PUBLIC at %L",
9577 arg->sym->name, sym->name, &sym->declared_at)
9580 /* Stop this message from recurring. */
9581 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9586 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9587 PRIVATE to the containing module. */
9588 for (iface = sym->generic; iface; iface = iface->next)
9590 for (arg = iface->sym->formal; arg; arg = arg->next)
9593 && arg->sym->ts.type == BT_DERIVED
9594 && !arg->sym->ts.u.derived->attr.use_assoc
9595 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9596 arg->sym->ts.u.derived->ns->default_access)
9597 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9598 "'%s' in PUBLIC interface '%s' at %L "
9599 "takes dummy arguments of '%s' which is "
9600 "PRIVATE", iface->sym->name, sym->name,
9601 &iface->sym->declared_at,
9602 gfc_typename (&arg->sym->ts)) == FAILURE)
9604 /* Stop this message from recurring. */
9605 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9611 /* PUBLIC interfaces may expose PRIVATE procedures that take types
9612 PRIVATE to the containing module. */
9613 for (iface = sym->generic; iface; iface = iface->next)
9615 for (arg = iface->sym->formal; arg; arg = arg->next)
9618 && arg->sym->ts.type == BT_DERIVED
9619 && !arg->sym->ts.u.derived->attr.use_assoc
9620 && !gfc_check_access (arg->sym->ts.u.derived->attr.access,
9621 arg->sym->ts.u.derived->ns->default_access)
9622 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
9623 "'%s' in PUBLIC interface '%s' at %L "
9624 "takes dummy arguments of '%s' which is "
9625 "PRIVATE", iface->sym->name, sym->name,
9626 &iface->sym->declared_at,
9627 gfc_typename (&arg->sym->ts)) == FAILURE)
9629 /* Stop this message from recurring. */
9630 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
9637 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
9638 && !sym->attr.proc_pointer)
9640 gfc_error ("Function '%s' at %L cannot have an initializer",
9641 sym->name, &sym->declared_at);
9645 /* An external symbol may not have an initializer because it is taken to be
9646 a procedure. Exception: Procedure Pointers. */
9647 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
9649 gfc_error ("External object '%s' at %L may not have an initializer",
9650 sym->name, &sym->declared_at);
9654 /* An elemental function is required to return a scalar 12.7.1 */
9655 if (sym->attr.elemental && sym->attr.function && sym->as)
9657 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
9658 "result", sym->name, &sym->declared_at);
9659 /* Reset so that the error only occurs once. */
9660 sym->attr.elemental = 0;
9664 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
9665 char-len-param shall not be array-valued, pointer-valued, recursive
9666 or pure. ....snip... A character value of * may only be used in the
9667 following ways: (i) Dummy arg of procedure - dummy associates with
9668 actual length; (ii) To declare a named constant; or (iii) External
9669 function - but length must be declared in calling scoping unit. */
9670 if (sym->attr.function
9671 && sym->ts.type == BT_CHARACTER
9672 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
9674 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
9675 || (sym->attr.recursive) || (sym->attr.pure))
9677 if (sym->as && sym->as->rank)
9678 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9679 "array-valued", sym->name, &sym->declared_at);
9681 if (sym->attr.pointer)
9682 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9683 "pointer-valued", sym->name, &sym->declared_at);
9686 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9687 "pure", sym->name, &sym->declared_at);
9689 if (sym->attr.recursive)
9690 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
9691 "recursive", sym->name, &sym->declared_at);
9696 /* Appendix B.2 of the standard. Contained functions give an
9697 error anyway. Fixed-form is likely to be F77/legacy. */
9698 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
9699 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
9700 "CHARACTER(*) function '%s' at %L",
9701 sym->name, &sym->declared_at);
9704 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
9706 gfc_formal_arglist *curr_arg;
9707 int has_non_interop_arg = 0;
9709 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
9710 sym->common_block) == FAILURE)
9712 /* Clear these to prevent looking at them again if there was an
9714 sym->attr.is_bind_c = 0;
9715 sym->attr.is_c_interop = 0;
9716 sym->ts.is_c_interop = 0;
9720 /* So far, no errors have been found. */
9721 sym->attr.is_c_interop = 1;
9722 sym->ts.is_c_interop = 1;
9725 curr_arg = sym->formal;
9726 while (curr_arg != NULL)
9728 /* Skip implicitly typed dummy args here. */
9729 if (curr_arg->sym->attr.implicit_type == 0)
9730 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
9731 /* If something is found to fail, record the fact so we
9732 can mark the symbol for the procedure as not being
9733 BIND(C) to try and prevent multiple errors being
9735 has_non_interop_arg = 1;
9737 curr_arg = curr_arg->next;
9740 /* See if any of the arguments were not interoperable and if so, clear
9741 the procedure symbol to prevent duplicate error messages. */
9742 if (has_non_interop_arg != 0)
9744 sym->attr.is_c_interop = 0;
9745 sym->ts.is_c_interop = 0;
9746 sym->attr.is_bind_c = 0;
9750 if (!sym->attr.proc_pointer)
9752 if (sym->attr.save == SAVE_EXPLICIT)
9754 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
9755 "in '%s' at %L", sym->name, &sym->declared_at);
9758 if (sym->attr.intent)
9760 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
9761 "in '%s' at %L", sym->name, &sym->declared_at);
9764 if (sym->attr.subroutine && sym->attr.result)
9766 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
9767 "in '%s' at %L", sym->name, &sym->declared_at);
9770 if (sym->attr.external && sym->attr.function
9771 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
9772 || sym->attr.contained))
9774 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
9775 "in '%s' at %L", sym->name, &sym->declared_at);
9778 if (strcmp ("ppr@", sym->name) == 0)
9780 gfc_error ("Procedure pointer result '%s' at %L "
9781 "is missing the pointer attribute",
9782 sym->ns->proc_name->name, &sym->declared_at);
9791 /* Resolve a list of finalizer procedures. That is, after they have hopefully
9792 been defined and we now know their defined arguments, check that they fulfill
9793 the requirements of the standard for procedures used as finalizers. */
9796 gfc_resolve_finalizers (gfc_symbol* derived)
9798 gfc_finalizer* list;
9799 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
9800 gfc_try result = SUCCESS;
9801 bool seen_scalar = false;
9803 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
9806 /* Walk over the list of finalizer-procedures, check them, and if any one
9807 does not fit in with the standard's definition, print an error and remove
9808 it from the list. */
9809 prev_link = &derived->f2k_derived->finalizers;
9810 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
9816 /* Skip this finalizer if we already resolved it. */
9817 if (list->proc_tree)
9819 prev_link = &(list->next);
9823 /* Check this exists and is a SUBROUTINE. */
9824 if (!list->proc_sym->attr.subroutine)
9826 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
9827 list->proc_sym->name, &list->where);
9831 /* We should have exactly one argument. */
9832 if (!list->proc_sym->formal || list->proc_sym->formal->next)
9834 gfc_error ("FINAL procedure at %L must have exactly one argument",
9838 arg = list->proc_sym->formal->sym;
9840 /* This argument must be of our type. */
9841 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
9843 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
9844 &arg->declared_at, derived->name);
9848 /* It must neither be a pointer nor allocatable nor optional. */
9849 if (arg->attr.pointer)
9851 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
9855 if (arg->attr.allocatable)
9857 gfc_error ("Argument of FINAL procedure at %L must not be"
9858 " ALLOCATABLE", &arg->declared_at);
9861 if (arg->attr.optional)
9863 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
9868 /* It must not be INTENT(OUT). */
9869 if (arg->attr.intent == INTENT_OUT)
9871 gfc_error ("Argument of FINAL procedure at %L must not be"
9872 " INTENT(OUT)", &arg->declared_at);
9876 /* Warn if the procedure is non-scalar and not assumed shape. */
9877 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
9878 && arg->as->type != AS_ASSUMED_SHAPE)
9879 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
9880 " shape argument", &arg->declared_at);
9882 /* Check that it does not match in kind and rank with a FINAL procedure
9883 defined earlier. To really loop over the *earlier* declarations,
9884 we need to walk the tail of the list as new ones were pushed at the
9886 /* TODO: Handle kind parameters once they are implemented. */
9887 my_rank = (arg->as ? arg->as->rank : 0);
9888 for (i = list->next; i; i = i->next)
9890 /* Argument list might be empty; that is an error signalled earlier,
9891 but we nevertheless continued resolving. */
9892 if (i->proc_sym->formal)
9894 gfc_symbol* i_arg = i->proc_sym->formal->sym;
9895 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
9896 if (i_rank == my_rank)
9898 gfc_error ("FINAL procedure '%s' declared at %L has the same"
9899 " rank (%d) as '%s'",
9900 list->proc_sym->name, &list->where, my_rank,
9907 /* Is this the/a scalar finalizer procedure? */
9908 if (!arg->as || arg->as->rank == 0)
9911 /* Find the symtree for this procedure. */
9912 gcc_assert (!list->proc_tree);
9913 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
9915 prev_link = &list->next;
9918 /* Remove wrong nodes immediately from the list so we don't risk any
9919 troubles in the future when they might fail later expectations. */
9923 *prev_link = list->next;
9924 gfc_free_finalizer (i);
9927 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
9928 were nodes in the list, must have been for arrays. It is surely a good
9929 idea to have a scalar version there if there's something to finalize. */
9930 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
9931 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
9932 " defined at %L, suggest also scalar one",
9933 derived->name, &derived->declared_at);
9935 /* TODO: Remove this error when finalization is finished. */
9936 gfc_error ("Finalization at %L is not yet implemented",
9937 &derived->declared_at);
9943 /* Check that it is ok for the typebound procedure proc to override the
9947 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
9950 const gfc_symbol* proc_target;
9951 const gfc_symbol* old_target;
9952 unsigned proc_pass_arg, old_pass_arg, argpos;
9953 gfc_formal_arglist* proc_formal;
9954 gfc_formal_arglist* old_formal;
9956 /* This procedure should only be called for non-GENERIC proc. */
9957 gcc_assert (!proc->n.tb->is_generic);
9959 /* If the overwritten procedure is GENERIC, this is an error. */
9960 if (old->n.tb->is_generic)
9962 gfc_error ("Can't overwrite GENERIC '%s' at %L",
9963 old->name, &proc->n.tb->where);
9967 where = proc->n.tb->where;
9968 proc_target = proc->n.tb->u.specific->n.sym;
9969 old_target = old->n.tb->u.specific->n.sym;
9971 /* Check that overridden binding is not NON_OVERRIDABLE. */
9972 if (old->n.tb->non_overridable)
9974 gfc_error ("'%s' at %L overrides a procedure binding declared"
9975 " NON_OVERRIDABLE", proc->name, &where);
9979 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
9980 if (!old->n.tb->deferred && proc->n.tb->deferred)
9982 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
9983 " non-DEFERRED binding", proc->name, &where);
9987 /* If the overridden binding is PURE, the overriding must be, too. */
9988 if (old_target->attr.pure && !proc_target->attr.pure)
9990 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
9991 proc->name, &where);
9995 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
9996 is not, the overriding must not be either. */
9997 if (old_target->attr.elemental && !proc_target->attr.elemental)
9999 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
10000 " ELEMENTAL", proc->name, &where);
10003 if (!old_target->attr.elemental && proc_target->attr.elemental)
10005 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
10006 " be ELEMENTAL, either", proc->name, &where);
10010 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
10012 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
10014 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
10015 " SUBROUTINE", proc->name, &where);
10019 /* If the overridden binding is a FUNCTION, the overriding must also be a
10020 FUNCTION and have the same characteristics. */
10021 if (old_target->attr.function)
10023 if (!proc_target->attr.function)
10025 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
10026 " FUNCTION", proc->name, &where);
10030 /* FIXME: Do more comprehensive checking (including, for instance, the
10031 rank and array-shape). */
10032 gcc_assert (proc_target->result && old_target->result);
10033 if (!gfc_compare_types (&proc_target->result->ts,
10034 &old_target->result->ts))
10036 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
10037 " matching result types", proc->name, &where);
10042 /* If the overridden binding is PUBLIC, the overriding one must not be
10044 if (old->n.tb->access == ACCESS_PUBLIC
10045 && proc->n.tb->access == ACCESS_PRIVATE)
10047 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
10048 " PRIVATE", proc->name, &where);
10052 /* Compare the formal argument lists of both procedures. This is also abused
10053 to find the position of the passed-object dummy arguments of both
10054 bindings as at least the overridden one might not yet be resolved and we
10055 need those positions in the check below. */
10056 proc_pass_arg = old_pass_arg = 0;
10057 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
10059 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
10062 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
10063 proc_formal && old_formal;
10064 proc_formal = proc_formal->next, old_formal = old_formal->next)
10066 if (proc->n.tb->pass_arg
10067 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
10068 proc_pass_arg = argpos;
10069 if (old->n.tb->pass_arg
10070 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
10071 old_pass_arg = argpos;
10073 /* Check that the names correspond. */
10074 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
10076 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
10077 " to match the corresponding argument of the overridden"
10078 " procedure", proc_formal->sym->name, proc->name, &where,
10079 old_formal->sym->name);
10083 /* Check that the types correspond if neither is the passed-object
10085 /* FIXME: Do more comprehensive testing here. */
10086 if (proc_pass_arg != argpos && old_pass_arg != argpos
10087 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10089 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10090 "in respect to the overridden procedure",
10091 proc_formal->sym->name, proc->name, &where);
10097 if (proc_formal || old_formal)
10099 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10100 " the overridden procedure", proc->name, &where);
10104 /* If the overridden binding is NOPASS, the overriding one must also be
10106 if (old->n.tb->nopass && !proc->n.tb->nopass)
10108 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10109 " NOPASS", proc->name, &where);
10113 /* If the overridden binding is PASS(x), the overriding one must also be
10114 PASS and the passed-object dummy arguments must correspond. */
10115 if (!old->n.tb->nopass)
10117 if (proc->n.tb->nopass)
10119 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10120 " PASS", proc->name, &where);
10124 if (proc_pass_arg != old_pass_arg)
10126 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10127 " the same position as the passed-object dummy argument of"
10128 " the overridden procedure", proc->name, &where);
10137 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10140 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10141 const char* generic_name, locus where)
10146 gcc_assert (t1->specific && t2->specific);
10147 gcc_assert (!t1->specific->is_generic);
10148 gcc_assert (!t2->specific->is_generic);
10150 sym1 = t1->specific->u.specific->n.sym;
10151 sym2 = t2->specific->u.specific->n.sym;
10156 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10157 if (sym1->attr.subroutine != sym2->attr.subroutine
10158 || sym1->attr.function != sym2->attr.function)
10160 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10161 " GENERIC '%s' at %L",
10162 sym1->name, sym2->name, generic_name, &where);
10166 /* Compare the interfaces. */
10167 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10169 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10170 sym1->name, sym2->name, generic_name, &where);
10178 /* Worker function for resolving a generic procedure binding; this is used to
10179 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10181 The difference between those cases is finding possible inherited bindings
10182 that are overridden, as one has to look for them in tb_sym_root,
10183 tb_uop_root or tb_op, respectively. Thus the caller must already find
10184 the super-type and set p->overridden correctly. */
10187 resolve_tb_generic_targets (gfc_symbol* super_type,
10188 gfc_typebound_proc* p, const char* name)
10190 gfc_tbp_generic* target;
10191 gfc_symtree* first_target;
10192 gfc_symtree* inherited;
10194 gcc_assert (p && p->is_generic);
10196 /* Try to find the specific bindings for the symtrees in our target-list. */
10197 gcc_assert (p->u.generic);
10198 for (target = p->u.generic; target; target = target->next)
10199 if (!target->specific)
10201 gfc_typebound_proc* overridden_tbp;
10202 gfc_tbp_generic* g;
10203 const char* target_name;
10205 target_name = target->specific_st->name;
10207 /* Defined for this type directly. */
10208 if (target->specific_st->n.tb)
10210 target->specific = target->specific_st->n.tb;
10211 goto specific_found;
10214 /* Look for an inherited specific binding. */
10217 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10222 gcc_assert (inherited->n.tb);
10223 target->specific = inherited->n.tb;
10224 goto specific_found;
10228 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10229 " at %L", target_name, name, &p->where);
10232 /* Once we've found the specific binding, check it is not ambiguous with
10233 other specifics already found or inherited for the same GENERIC. */
10235 gcc_assert (target->specific);
10237 /* This must really be a specific binding! */
10238 if (target->specific->is_generic)
10240 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10241 " '%s' is GENERIC, too", name, &p->where, target_name);
10245 /* Check those already resolved on this type directly. */
10246 for (g = p->u.generic; g; g = g->next)
10247 if (g != target && g->specific
10248 && check_generic_tbp_ambiguity (target, g, name, p->where)
10252 /* Check for ambiguity with inherited specific targets. */
10253 for (overridden_tbp = p->overridden; overridden_tbp;
10254 overridden_tbp = overridden_tbp->overridden)
10255 if (overridden_tbp->is_generic)
10257 for (g = overridden_tbp->u.generic; g; g = g->next)
10259 gcc_assert (g->specific);
10260 if (check_generic_tbp_ambiguity (target, g,
10261 name, p->where) == FAILURE)
10267 /* If we attempt to "overwrite" a specific binding, this is an error. */
10268 if (p->overridden && !p->overridden->is_generic)
10270 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10271 " the same name", name, &p->where);
10275 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10276 all must have the same attributes here. */
10277 first_target = p->u.generic->specific->u.specific;
10278 gcc_assert (first_target);
10279 p->subroutine = first_target->n.sym->attr.subroutine;
10280 p->function = first_target->n.sym->attr.function;
10286 /* Resolve a GENERIC procedure binding for a derived type. */
10289 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10291 gfc_symbol* super_type;
10293 /* Find the overridden binding if any. */
10294 st->n.tb->overridden = NULL;
10295 super_type = gfc_get_derived_super_type (derived);
10298 gfc_symtree* overridden;
10299 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10302 if (overridden && overridden->n.tb)
10303 st->n.tb->overridden = overridden->n.tb;
10306 /* Resolve using worker function. */
10307 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10311 /* Retrieve the target-procedure of an operator binding and do some checks in
10312 common for intrinsic and user-defined type-bound operators. */
10315 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10317 gfc_symbol* target_proc;
10319 gcc_assert (target->specific && !target->specific->is_generic);
10320 target_proc = target->specific->u.specific->n.sym;
10321 gcc_assert (target_proc);
10323 /* All operator bindings must have a passed-object dummy argument. */
10324 if (target->specific->nopass)
10326 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10330 return target_proc;
10334 /* Resolve a type-bound intrinsic operator. */
10337 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10338 gfc_typebound_proc* p)
10340 gfc_symbol* super_type;
10341 gfc_tbp_generic* target;
10343 /* If there's already an error here, do nothing (but don't fail again). */
10347 /* Operators should always be GENERIC bindings. */
10348 gcc_assert (p->is_generic);
10350 /* Look for an overridden binding. */
10351 super_type = gfc_get_derived_super_type (derived);
10352 if (super_type && super_type->f2k_derived)
10353 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10356 p->overridden = NULL;
10358 /* Resolve general GENERIC properties using worker function. */
10359 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10362 /* Check the targets to be procedures of correct interface. */
10363 for (target = p->u.generic; target; target = target->next)
10365 gfc_symbol* target_proc;
10367 target_proc = get_checked_tb_operator_target (target, p->where);
10371 if (!gfc_check_operator_interface (target_proc, op, p->where))
10383 /* Resolve a type-bound user operator (tree-walker callback). */
10385 static gfc_symbol* resolve_bindings_derived;
10386 static gfc_try resolve_bindings_result;
10388 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10391 resolve_typebound_user_op (gfc_symtree* stree)
10393 gfc_symbol* super_type;
10394 gfc_tbp_generic* target;
10396 gcc_assert (stree && stree->n.tb);
10398 if (stree->n.tb->error)
10401 /* Operators should always be GENERIC bindings. */
10402 gcc_assert (stree->n.tb->is_generic);
10404 /* Find overridden procedure, if any. */
10405 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10406 if (super_type && super_type->f2k_derived)
10408 gfc_symtree* overridden;
10409 overridden = gfc_find_typebound_user_op (super_type, NULL,
10410 stree->name, true, NULL);
10412 if (overridden && overridden->n.tb)
10413 stree->n.tb->overridden = overridden->n.tb;
10416 stree->n.tb->overridden = NULL;
10418 /* Resolve basically using worker function. */
10419 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10423 /* Check the targets to be functions of correct interface. */
10424 for (target = stree->n.tb->u.generic; target; target = target->next)
10426 gfc_symbol* target_proc;
10428 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10432 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10439 resolve_bindings_result = FAILURE;
10440 stree->n.tb->error = 1;
10444 /* Resolve the type-bound procedures for a derived type. */
10447 resolve_typebound_procedure (gfc_symtree* stree)
10451 gfc_symbol* me_arg;
10452 gfc_symbol* super_type;
10453 gfc_component* comp;
10455 gcc_assert (stree);
10457 /* Undefined specific symbol from GENERIC target definition. */
10461 if (stree->n.tb->error)
10464 /* If this is a GENERIC binding, use that routine. */
10465 if (stree->n.tb->is_generic)
10467 if (resolve_typebound_generic (resolve_bindings_derived, stree)
10473 /* Get the target-procedure to check it. */
10474 gcc_assert (!stree->n.tb->is_generic);
10475 gcc_assert (stree->n.tb->u.specific);
10476 proc = stree->n.tb->u.specific->n.sym;
10477 where = stree->n.tb->where;
10479 /* Default access should already be resolved from the parser. */
10480 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
10482 /* It should be a module procedure or an external procedure with explicit
10483 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
10484 if ((!proc->attr.subroutine && !proc->attr.function)
10485 || (proc->attr.proc != PROC_MODULE
10486 && proc->attr.if_source != IFSRC_IFBODY)
10487 || (proc->attr.abstract && !stree->n.tb->deferred))
10489 gfc_error ("'%s' must be a module procedure or an external procedure with"
10490 " an explicit interface at %L", proc->name, &where);
10493 stree->n.tb->subroutine = proc->attr.subroutine;
10494 stree->n.tb->function = proc->attr.function;
10496 /* Find the super-type of the current derived type. We could do this once and
10497 store in a global if speed is needed, but as long as not I believe this is
10498 more readable and clearer. */
10499 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10501 /* If PASS, resolve and check arguments if not already resolved / loaded
10502 from a .mod file. */
10503 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
10505 if (stree->n.tb->pass_arg)
10507 gfc_formal_arglist* i;
10509 /* If an explicit passing argument name is given, walk the arg-list
10510 and look for it. */
10513 stree->n.tb->pass_arg_num = 1;
10514 for (i = proc->formal; i; i = i->next)
10516 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
10521 ++stree->n.tb->pass_arg_num;
10526 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
10528 proc->name, stree->n.tb->pass_arg, &where,
10529 stree->n.tb->pass_arg);
10535 /* Otherwise, take the first one; there should in fact be at least
10537 stree->n.tb->pass_arg_num = 1;
10540 gfc_error ("Procedure '%s' with PASS at %L must have at"
10541 " least one argument", proc->name, &where);
10544 me_arg = proc->formal->sym;
10547 /* Now check that the argument-type matches and the passed-object
10548 dummy argument is generally fine. */
10550 gcc_assert (me_arg);
10552 if (me_arg->ts.type != BT_CLASS)
10554 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
10555 " at %L", proc->name, &where);
10559 if (CLASS_DATA (me_arg)->ts.u.derived
10560 != resolve_bindings_derived)
10562 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10563 " the derived-type '%s'", me_arg->name, proc->name,
10564 me_arg->name, &where, resolve_bindings_derived->name);
10568 gcc_assert (me_arg->ts.type == BT_CLASS);
10569 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
10571 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
10572 " scalar", proc->name, &where);
10575 if (CLASS_DATA (me_arg)->attr.allocatable)
10577 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10578 " be ALLOCATABLE", proc->name, &where);
10581 if (CLASS_DATA (me_arg)->attr.class_pointer)
10583 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
10584 " be POINTER", proc->name, &where);
10589 /* If we are extending some type, check that we don't override a procedure
10590 flagged NON_OVERRIDABLE. */
10591 stree->n.tb->overridden = NULL;
10594 gfc_symtree* overridden;
10595 overridden = gfc_find_typebound_proc (super_type, NULL,
10596 stree->name, true, NULL);
10598 if (overridden && overridden->n.tb)
10599 stree->n.tb->overridden = overridden->n.tb;
10601 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
10605 /* See if there's a name collision with a component directly in this type. */
10606 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
10607 if (!strcmp (comp->name, stree->name))
10609 gfc_error ("Procedure '%s' at %L has the same name as a component of"
10611 stree->name, &where, resolve_bindings_derived->name);
10615 /* Try to find a name collision with an inherited component. */
10616 if (super_type && gfc_find_component (super_type, stree->name, true, true))
10618 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
10619 " component of '%s'",
10620 stree->name, &where, resolve_bindings_derived->name);
10624 stree->n.tb->error = 0;
10628 resolve_bindings_result = FAILURE;
10629 stree->n.tb->error = 1;
10633 resolve_typebound_procedures (gfc_symbol* derived)
10637 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
10640 resolve_bindings_derived = derived;
10641 resolve_bindings_result = SUCCESS;
10643 if (derived->f2k_derived->tb_sym_root)
10644 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
10645 &resolve_typebound_procedure);
10647 if (derived->f2k_derived->tb_uop_root)
10648 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
10649 &resolve_typebound_user_op);
10651 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
10653 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
10654 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
10656 resolve_bindings_result = FAILURE;
10659 return resolve_bindings_result;
10663 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
10664 to give all identical derived types the same backend_decl. */
10666 add_dt_to_dt_list (gfc_symbol *derived)
10668 gfc_dt_list *dt_list;
10670 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
10671 if (derived == dt_list->derived)
10674 if (dt_list == NULL)
10676 dt_list = gfc_get_dt_list ();
10677 dt_list->next = gfc_derived_types;
10678 dt_list->derived = derived;
10679 gfc_derived_types = dt_list;
10684 /* Ensure that a derived-type is really not abstract, meaning that every
10685 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
10688 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
10693 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
10695 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
10698 if (st->n.tb && st->n.tb->deferred)
10700 gfc_symtree* overriding;
10701 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
10704 gcc_assert (overriding->n.tb);
10705 if (overriding->n.tb->deferred)
10707 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
10708 " '%s' is DEFERRED and not overridden",
10709 sub->name, &sub->declared_at, st->name);
10718 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
10720 /* The algorithm used here is to recursively travel up the ancestry of sub
10721 and for each ancestor-type, check all bindings. If any of them is
10722 DEFERRED, look it up starting from sub and see if the found (overriding)
10723 binding is not DEFERRED.
10724 This is not the most efficient way to do this, but it should be ok and is
10725 clearer than something sophisticated. */
10727 gcc_assert (ancestor && !sub->attr.abstract);
10729 if (!ancestor->attr.abstract)
10732 /* Walk bindings of this ancestor. */
10733 if (ancestor->f2k_derived)
10736 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
10741 /* Find next ancestor type and recurse on it. */
10742 ancestor = gfc_get_derived_super_type (ancestor);
10744 return ensure_not_abstract (sub, ancestor);
10750 static void resolve_symbol (gfc_symbol *sym);
10753 /* Resolve the components of a derived type. */
10756 resolve_fl_derived (gfc_symbol *sym)
10758 gfc_symbol* super_type;
10762 super_type = gfc_get_derived_super_type (sym);
10764 if (sym->attr.is_class && sym->ts.u.derived == NULL)
10766 /* Fix up incomplete CLASS symbols. */
10767 gfc_component *data = gfc_find_component (sym, "$data", true, true);
10768 gfc_component *vptr = gfc_find_component (sym, "$vptr", true, true);
10769 if (vptr->ts.u.derived == NULL)
10771 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived, false);
10773 vptr->ts.u.derived = vtab->ts.u.derived;
10778 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
10780 gfc_error ("As extending type '%s' at %L has a coarray component, "
10781 "parent type '%s' shall also have one", sym->name,
10782 &sym->declared_at, super_type->name);
10786 /* Ensure the extended type gets resolved before we do. */
10787 if (super_type && resolve_fl_derived (super_type) == FAILURE)
10790 /* An ABSTRACT type must be extensible. */
10791 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
10793 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
10794 sym->name, &sym->declared_at);
10798 for (c = sym->components; c != NULL; c = c->next)
10801 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
10802 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
10804 gfc_error ("Coarray component '%s' at %L must be allocatable with "
10805 "deferred shape", c->name, &c->loc);
10810 if (c->attr.codimension && c->ts.type == BT_DERIVED
10811 && c->ts.u.derived->ts.is_iso_c)
10813 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
10814 "shall not be a coarray", c->name, &c->loc);
10819 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
10820 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
10821 || c->attr.allocatable))
10823 gfc_error ("Component '%s' at %L with coarray component "
10824 "shall be a nonpointer, nonallocatable scalar",
10829 if (c->attr.proc_pointer && c->ts.interface)
10831 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
10832 gfc_error ("Interface '%s', used by procedure pointer component "
10833 "'%s' at %L, is declared in a later PROCEDURE statement",
10834 c->ts.interface->name, c->name, &c->loc);
10836 /* Get the attributes from the interface (now resolved). */
10837 if (c->ts.interface->attr.if_source
10838 || c->ts.interface->attr.intrinsic)
10840 gfc_symbol *ifc = c->ts.interface;
10842 if (ifc->formal && !ifc->formal_ns)
10843 resolve_symbol (ifc);
10845 if (ifc->attr.intrinsic)
10846 resolve_intrinsic (ifc, &ifc->declared_at);
10850 c->ts = ifc->result->ts;
10851 c->attr.allocatable = ifc->result->attr.allocatable;
10852 c->attr.pointer = ifc->result->attr.pointer;
10853 c->attr.dimension = ifc->result->attr.dimension;
10854 c->as = gfc_copy_array_spec (ifc->result->as);
10859 c->attr.allocatable = ifc->attr.allocatable;
10860 c->attr.pointer = ifc->attr.pointer;
10861 c->attr.dimension = ifc->attr.dimension;
10862 c->as = gfc_copy_array_spec (ifc->as);
10864 c->ts.interface = ifc;
10865 c->attr.function = ifc->attr.function;
10866 c->attr.subroutine = ifc->attr.subroutine;
10867 gfc_copy_formal_args_ppc (c, ifc);
10869 c->attr.pure = ifc->attr.pure;
10870 c->attr.elemental = ifc->attr.elemental;
10871 c->attr.recursive = ifc->attr.recursive;
10872 c->attr.always_explicit = ifc->attr.always_explicit;
10873 c->attr.ext_attr |= ifc->attr.ext_attr;
10874 /* Replace symbols in array spec. */
10878 for (i = 0; i < c->as->rank; i++)
10880 gfc_expr_replace_comp (c->as->lower[i], c);
10881 gfc_expr_replace_comp (c->as->upper[i], c);
10884 /* Copy char length. */
10885 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
10887 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
10888 gfc_expr_replace_comp (cl->length, c);
10889 if (cl->length && !cl->resolved
10890 && gfc_resolve_expr (cl->length) == FAILURE)
10895 else if (c->ts.interface->name[0] != '\0' && !sym->attr.vtype)
10897 gfc_error ("Interface '%s' of procedure pointer component "
10898 "'%s' at %L must be explicit", c->ts.interface->name,
10903 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
10905 /* Since PPCs are not implicitly typed, a PPC without an explicit
10906 interface must be a subroutine. */
10907 gfc_add_subroutine (&c->attr, c->name, &c->loc);
10910 /* Procedure pointer components: Check PASS arg. */
10911 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
10912 && !sym->attr.vtype)
10914 gfc_symbol* me_arg;
10916 if (c->tb->pass_arg)
10918 gfc_formal_arglist* i;
10920 /* If an explicit passing argument name is given, walk the arg-list
10921 and look for it. */
10924 c->tb->pass_arg_num = 1;
10925 for (i = c->formal; i; i = i->next)
10927 if (!strcmp (i->sym->name, c->tb->pass_arg))
10932 c->tb->pass_arg_num++;
10937 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
10938 "at %L has no argument '%s'", c->name,
10939 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
10946 /* Otherwise, take the first one; there should in fact be at least
10948 c->tb->pass_arg_num = 1;
10951 gfc_error ("Procedure pointer component '%s' with PASS at %L "
10952 "must have at least one argument",
10957 me_arg = c->formal->sym;
10960 /* Now check that the argument-type matches. */
10961 gcc_assert (me_arg);
10962 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
10963 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
10964 || (me_arg->ts.type == BT_CLASS
10965 && CLASS_DATA (me_arg)->ts.u.derived != sym))
10967 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
10968 " the derived type '%s'", me_arg->name, c->name,
10969 me_arg->name, &c->loc, sym->name);
10974 /* Check for C453. */
10975 if (me_arg->attr.dimension)
10977 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10978 "must be scalar", me_arg->name, c->name, me_arg->name,
10984 if (me_arg->attr.pointer)
10986 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10987 "may not have the POINTER attribute", me_arg->name,
10988 c->name, me_arg->name, &c->loc);
10993 if (me_arg->attr.allocatable)
10995 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
10996 "may not be ALLOCATABLE", me_arg->name, c->name,
10997 me_arg->name, &c->loc);
11002 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11003 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11004 " at %L", c->name, &c->loc);
11008 /* Check type-spec if this is not the parent-type component. */
11009 if ((!sym->attr.extension || c != sym->components)
11010 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11013 /* If this type is an extension, set the accessibility of the parent
11015 if (super_type && c == sym->components
11016 && strcmp (super_type->name, c->name) == 0)
11017 c->attr.access = super_type->attr.access;
11019 /* If this type is an extension, see if this component has the same name
11020 as an inherited type-bound procedure. */
11021 if (super_type && !sym->attr.is_class
11022 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11024 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11025 " inherited type-bound procedure",
11026 c->name, sym->name, &c->loc);
11030 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer)
11032 if (c->ts.u.cl->length == NULL
11033 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11034 || !gfc_is_constant_expr (c->ts.u.cl->length))
11036 gfc_error ("Character length of component '%s' needs to "
11037 "be a constant specification expression at %L",
11039 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11044 if (c->ts.type == BT_DERIVED
11045 && sym->component_access != ACCESS_PRIVATE
11046 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11047 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11048 && !c->ts.u.derived->attr.use_assoc
11049 && !gfc_check_access (c->ts.u.derived->attr.access,
11050 c->ts.u.derived->ns->default_access)
11051 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11052 "is a PRIVATE type and cannot be a component of "
11053 "'%s', which is PUBLIC at %L", c->name,
11054 sym->name, &sym->declared_at) == FAILURE)
11057 if (sym->attr.sequence)
11059 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11061 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11062 "not have the SEQUENCE attribute",
11063 c->ts.u.derived->name, &sym->declared_at);
11068 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && c->attr.pointer
11069 && c->ts.u.derived->components == NULL
11070 && !c->ts.u.derived->attr.zero_comp)
11072 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11073 "that has not been declared", c->name, sym->name,
11078 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.pointer
11079 && CLASS_DATA (c)->ts.u.derived->components == NULL
11080 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11082 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11083 "that has not been declared", c->name, sym->name,
11089 if (c->ts.type == BT_CLASS
11090 && !(CLASS_DATA (c)->attr.pointer || CLASS_DATA (c)->attr.allocatable))
11092 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11093 "or pointer", c->name, &c->loc);
11097 /* Ensure that all the derived type components are put on the
11098 derived type list; even in formal namespaces, where derived type
11099 pointer components might not have been declared. */
11100 if (c->ts.type == BT_DERIVED
11102 && c->ts.u.derived->components
11104 && sym != c->ts.u.derived)
11105 add_dt_to_dt_list (c->ts.u.derived);
11107 if (c->attr.pointer || c->attr.proc_pointer || c->attr.allocatable
11111 for (i = 0; i < c->as->rank; i++)
11113 if (c->as->lower[i] == NULL
11114 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
11115 || !gfc_is_constant_expr (c->as->lower[i])
11116 || c->as->upper[i] == NULL
11117 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
11118 || !gfc_is_constant_expr (c->as->upper[i]))
11120 gfc_error ("Component '%s' of '%s' at %L must have "
11121 "constant array bounds",
11122 c->name, sym->name, &c->loc);
11128 /* Resolve the type-bound procedures. */
11129 if (resolve_typebound_procedures (sym) == FAILURE)
11132 /* Resolve the finalizer procedures. */
11133 if (gfc_resolve_finalizers (sym) == FAILURE)
11136 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11137 all DEFERRED bindings are overridden. */
11138 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11139 && ensure_not_abstract (sym, super_type) == FAILURE)
11142 /* Add derived type to the derived type list. */
11143 add_dt_to_dt_list (sym);
11150 resolve_fl_namelist (gfc_symbol *sym)
11155 /* Reject PRIVATE objects in a PUBLIC namelist. */
11156 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
11158 for (nl = sym->namelist; nl; nl = nl->next)
11160 if (!nl->sym->attr.use_assoc
11161 && !is_sym_host_assoc (nl->sym, sym->ns)
11162 && !gfc_check_access(nl->sym->attr.access,
11163 nl->sym->ns->default_access))
11165 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11166 "cannot be member of PUBLIC namelist '%s' at %L",
11167 nl->sym->name, sym->name, &sym->declared_at);
11171 /* Types with private components that came here by USE-association. */
11172 if (nl->sym->ts.type == BT_DERIVED
11173 && derived_inaccessible (nl->sym->ts.u.derived))
11175 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11176 "components and cannot be member of namelist '%s' at %L",
11177 nl->sym->name, sym->name, &sym->declared_at);
11181 /* Types with private components that are defined in the same module. */
11182 if (nl->sym->ts.type == BT_DERIVED
11183 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11184 && !gfc_check_access (nl->sym->ts.u.derived->attr.private_comp
11185 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
11186 nl->sym->ns->default_access))
11188 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11189 "cannot be a member of PUBLIC namelist '%s' at %L",
11190 nl->sym->name, sym->name, &sym->declared_at);
11196 for (nl = sym->namelist; nl; nl = nl->next)
11198 /* Reject namelist arrays of assumed shape. */
11199 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11200 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
11201 "must not have assumed shape in namelist "
11202 "'%s' at %L", nl->sym->name, sym->name,
11203 &sym->declared_at) == FAILURE)
11206 /* Reject namelist arrays that are not constant shape. */
11207 if (is_non_constant_shape_array (nl->sym))
11209 gfc_error ("NAMELIST array object '%s' must have constant "
11210 "shape in namelist '%s' at %L", nl->sym->name,
11211 sym->name, &sym->declared_at);
11215 /* Namelist objects cannot have allocatable or pointer components. */
11216 if (nl->sym->ts.type != BT_DERIVED)
11219 if (nl->sym->ts.u.derived->attr.alloc_comp)
11221 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11222 "have ALLOCATABLE components",
11223 nl->sym->name, sym->name, &sym->declared_at);
11227 if (nl->sym->ts.u.derived->attr.pointer_comp)
11229 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
11230 "have POINTER components",
11231 nl->sym->name, sym->name, &sym->declared_at);
11237 /* 14.1.2 A module or internal procedure represent local entities
11238 of the same type as a namelist member and so are not allowed. */
11239 for (nl = sym->namelist; nl; nl = nl->next)
11241 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11244 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11245 if ((nl->sym == sym->ns->proc_name)
11247 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11251 if (nl->sym && nl->sym->name)
11252 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11253 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11255 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11256 "attribute in '%s' at %L", nlsym->name,
11257 &sym->declared_at);
11267 resolve_fl_parameter (gfc_symbol *sym)
11269 /* A parameter array's shape needs to be constant. */
11270 if (sym->as != NULL
11271 && (sym->as->type == AS_DEFERRED
11272 || is_non_constant_shape_array (sym)))
11274 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11275 "or of deferred shape", sym->name, &sym->declared_at);
11279 /* Make sure a parameter that has been implicitly typed still
11280 matches the implicit type, since PARAMETER statements can precede
11281 IMPLICIT statements. */
11282 if (sym->attr.implicit_type
11283 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11286 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11287 "later IMPLICIT type", sym->name, &sym->declared_at);
11291 /* Make sure the types of derived parameters are consistent. This
11292 type checking is deferred until resolution because the type may
11293 refer to a derived type from the host. */
11294 if (sym->ts.type == BT_DERIVED
11295 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11297 gfc_error ("Incompatible derived type in PARAMETER at %L",
11298 &sym->value->where);
11305 /* Do anything necessary to resolve a symbol. Right now, we just
11306 assume that an otherwise unknown symbol is a variable. This sort
11307 of thing commonly happens for symbols in module. */
11310 resolve_symbol (gfc_symbol *sym)
11312 int check_constant, mp_flag;
11313 gfc_symtree *symtree;
11314 gfc_symtree *this_symtree;
11318 /* Avoid double resolution of function result symbols. */
11319 if ((sym->result || sym->attr.result) && (sym->ns != gfc_current_ns))
11322 if (sym->attr.flavor == FL_UNKNOWN)
11325 /* If we find that a flavorless symbol is an interface in one of the
11326 parent namespaces, find its symtree in this namespace, free the
11327 symbol and set the symtree to point to the interface symbol. */
11328 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11330 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11331 if (symtree && symtree->n.sym->generic)
11333 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11337 gfc_free_symbol (sym);
11338 symtree->n.sym->refs++;
11339 this_symtree->n.sym = symtree->n.sym;
11344 /* Otherwise give it a flavor according to such attributes as
11346 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11347 sym->attr.flavor = FL_VARIABLE;
11350 sym->attr.flavor = FL_PROCEDURE;
11351 if (sym->attr.dimension)
11352 sym->attr.function = 1;
11356 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11357 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11359 if (sym->attr.procedure && sym->ts.interface
11360 && sym->attr.if_source != IFSRC_DECL)
11362 if (sym->ts.interface == sym)
11364 gfc_error ("PROCEDURE '%s' at %L may not be used as its own "
11365 "interface", sym->name, &sym->declared_at);
11368 if (sym->ts.interface->attr.procedure)
11370 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared"
11371 " in a later PROCEDURE statement", sym->ts.interface->name,
11372 sym->name,&sym->declared_at);
11376 /* Get the attributes from the interface (now resolved). */
11377 if (sym->ts.interface->attr.if_source
11378 || sym->ts.interface->attr.intrinsic)
11380 gfc_symbol *ifc = sym->ts.interface;
11381 resolve_symbol (ifc);
11383 if (ifc->attr.intrinsic)
11384 resolve_intrinsic (ifc, &ifc->declared_at);
11387 sym->ts = ifc->result->ts;
11390 sym->ts.interface = ifc;
11391 sym->attr.function = ifc->attr.function;
11392 sym->attr.subroutine = ifc->attr.subroutine;
11393 gfc_copy_formal_args (sym, ifc);
11395 sym->attr.allocatable = ifc->attr.allocatable;
11396 sym->attr.pointer = ifc->attr.pointer;
11397 sym->attr.pure = ifc->attr.pure;
11398 sym->attr.elemental = ifc->attr.elemental;
11399 sym->attr.dimension = ifc->attr.dimension;
11400 sym->attr.recursive = ifc->attr.recursive;
11401 sym->attr.always_explicit = ifc->attr.always_explicit;
11402 sym->attr.ext_attr |= ifc->attr.ext_attr;
11403 /* Copy array spec. */
11404 sym->as = gfc_copy_array_spec (ifc->as);
11408 for (i = 0; i < sym->as->rank; i++)
11410 gfc_expr_replace_symbols (sym->as->lower[i], sym);
11411 gfc_expr_replace_symbols (sym->as->upper[i], sym);
11414 /* Copy char length. */
11415 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11417 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11418 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
11419 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
11420 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
11424 else if (sym->ts.interface->name[0] != '\0')
11426 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
11427 sym->ts.interface->name, sym->name, &sym->declared_at);
11432 if (sym->attr.is_protected && !sym->attr.proc_pointer
11433 && (sym->attr.procedure || sym->attr.external))
11435 if (sym->attr.external)
11436 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11437 "at %L", &sym->declared_at);
11439 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11440 "at %L", &sym->declared_at);
11445 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11448 /* Symbols that are module procedures with results (functions) have
11449 the types and array specification copied for type checking in
11450 procedures that call them, as well as for saving to a module
11451 file. These symbols can't stand the scrutiny that their results
11453 mp_flag = (sym->result != NULL && sym->result != sym);
11455 /* Make sure that the intrinsic is consistent with its internal
11456 representation. This needs to be done before assigning a default
11457 type to avoid spurious warnings. */
11458 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11459 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11462 /* For associate names, resolve corresponding expression and make sure
11463 they get their type-spec set this way. */
11466 gcc_assert (sym->attr.flavor == FL_VARIABLE);
11467 if (gfc_resolve_expr (sym->assoc->target) != SUCCESS)
11470 sym->ts = sym->assoc->target->ts;
11471 gcc_assert (sym->ts.type != BT_UNKNOWN);
11474 /* Assign default type to symbols that need one and don't have one. */
11475 if (sym->ts.type == BT_UNKNOWN)
11477 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
11478 gfc_set_default_type (sym, 1, NULL);
11480 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
11481 && !sym->attr.function && !sym->attr.subroutine
11482 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
11483 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
11485 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
11487 /* The specific case of an external procedure should emit an error
11488 in the case that there is no implicit type. */
11490 gfc_set_default_type (sym, sym->attr.external, NULL);
11493 /* Result may be in another namespace. */
11494 resolve_symbol (sym->result);
11496 if (!sym->result->attr.proc_pointer)
11498 sym->ts = sym->result->ts;
11499 sym->as = gfc_copy_array_spec (sym->result->as);
11500 sym->attr.dimension = sym->result->attr.dimension;
11501 sym->attr.pointer = sym->result->attr.pointer;
11502 sym->attr.allocatable = sym->result->attr.allocatable;
11508 /* Assumed size arrays and assumed shape arrays must be dummy
11511 if (sym->as != NULL
11512 && ((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
11513 || sym->as->type == AS_ASSUMED_SHAPE)
11514 && sym->attr.dummy == 0)
11516 if (sym->as->type == AS_ASSUMED_SIZE)
11517 gfc_error ("Assumed size array at %L must be a dummy argument",
11518 &sym->declared_at);
11520 gfc_error ("Assumed shape array at %L must be a dummy argument",
11521 &sym->declared_at);
11525 /* Make sure symbols with known intent or optional are really dummy
11526 variable. Because of ENTRY statement, this has to be deferred
11527 until resolution time. */
11529 if (!sym->attr.dummy
11530 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
11532 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
11536 if (sym->attr.value && !sym->attr.dummy)
11538 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
11539 "it is not a dummy argument", sym->name, &sym->declared_at);
11543 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
11545 gfc_charlen *cl = sym->ts.u.cl;
11546 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
11548 gfc_error ("Character dummy variable '%s' at %L with VALUE "
11549 "attribute must have constant length",
11550 sym->name, &sym->declared_at);
11554 if (sym->ts.is_c_interop
11555 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
11557 gfc_error ("C interoperable character dummy variable '%s' at %L "
11558 "with VALUE attribute must have length one",
11559 sym->name, &sym->declared_at);
11564 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
11565 do this for something that was implicitly typed because that is handled
11566 in gfc_set_default_type. Handle dummy arguments and procedure
11567 definitions separately. Also, anything that is use associated is not
11568 handled here but instead is handled in the module it is declared in.
11569 Finally, derived type definitions are allowed to be BIND(C) since that
11570 only implies that they're interoperable, and they are checked fully for
11571 interoperability when a variable is declared of that type. */
11572 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
11573 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
11574 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
11576 gfc_try t = SUCCESS;
11578 /* First, make sure the variable is declared at the
11579 module-level scope (J3/04-007, Section 15.3). */
11580 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
11581 sym->attr.in_common == 0)
11583 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
11584 "is neither a COMMON block nor declared at the "
11585 "module level scope", sym->name, &(sym->declared_at));
11588 else if (sym->common_head != NULL)
11590 t = verify_com_block_vars_c_interop (sym->common_head);
11594 /* If type() declaration, we need to verify that the components
11595 of the given type are all C interoperable, etc. */
11596 if (sym->ts.type == BT_DERIVED &&
11597 sym->ts.u.derived->attr.is_c_interop != 1)
11599 /* Make sure the user marked the derived type as BIND(C). If
11600 not, call the verify routine. This could print an error
11601 for the derived type more than once if multiple variables
11602 of that type are declared. */
11603 if (sym->ts.u.derived->attr.is_bind_c != 1)
11604 verify_bind_c_derived_type (sym->ts.u.derived);
11608 /* Verify the variable itself as C interoperable if it
11609 is BIND(C). It is not possible for this to succeed if
11610 the verify_bind_c_derived_type failed, so don't have to handle
11611 any error returned by verify_bind_c_derived_type. */
11612 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
11613 sym->common_block);
11618 /* clear the is_bind_c flag to prevent reporting errors more than
11619 once if something failed. */
11620 sym->attr.is_bind_c = 0;
11625 /* If a derived type symbol has reached this point, without its
11626 type being declared, we have an error. Notice that most
11627 conditions that produce undefined derived types have already
11628 been dealt with. However, the likes of:
11629 implicit type(t) (t) ..... call foo (t) will get us here if
11630 the type is not declared in the scope of the implicit
11631 statement. Change the type to BT_UNKNOWN, both because it is so
11632 and to prevent an ICE. */
11633 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
11634 && !sym->ts.u.derived->attr.zero_comp)
11636 gfc_error ("The derived type '%s' at %L is of type '%s', "
11637 "which has not been defined", sym->name,
11638 &sym->declared_at, sym->ts.u.derived->name);
11639 sym->ts.type = BT_UNKNOWN;
11643 /* Make sure that the derived type has been resolved and that the
11644 derived type is visible in the symbol's namespace, if it is a
11645 module function and is not PRIVATE. */
11646 if (sym->ts.type == BT_DERIVED
11647 && sym->ts.u.derived->attr.use_assoc
11648 && sym->ns->proc_name
11649 && sym->ns->proc_name->attr.flavor == FL_MODULE)
11653 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
11656 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
11657 if (!ds && sym->attr.function
11658 && gfc_check_access (sym->attr.access, sym->ns->default_access))
11660 symtree = gfc_new_symtree (&sym->ns->sym_root,
11661 sym->ts.u.derived->name);
11662 symtree->n.sym = sym->ts.u.derived;
11663 sym->ts.u.derived->refs++;
11667 /* Unless the derived-type declaration is use associated, Fortran 95
11668 does not allow public entries of private derived types.
11669 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
11670 161 in 95-006r3. */
11671 if (sym->ts.type == BT_DERIVED
11672 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
11673 && !sym->ts.u.derived->attr.use_assoc
11674 && gfc_check_access (sym->attr.access, sym->ns->default_access)
11675 && !gfc_check_access (sym->ts.u.derived->attr.access,
11676 sym->ts.u.derived->ns->default_access)
11677 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
11678 "of PRIVATE derived type '%s'",
11679 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
11680 : "variable", sym->name, &sym->declared_at,
11681 sym->ts.u.derived->name) == FAILURE)
11684 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
11685 default initialization is defined (5.1.2.4.4). */
11686 if (sym->ts.type == BT_DERIVED
11688 && sym->attr.intent == INTENT_OUT
11690 && sym->as->type == AS_ASSUMED_SIZE)
11692 for (c = sym->ts.u.derived->components; c; c = c->next)
11694 if (c->initializer)
11696 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
11697 "ASSUMED SIZE and so cannot have a default initializer",
11698 sym->name, &sym->declared_at);
11705 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11706 || sym->attr.codimension)
11707 && sym->attr.result)
11708 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
11709 "a coarray component", sym->name, &sym->declared_at);
11712 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
11713 && sym->ts.u.derived->ts.is_iso_c)
11714 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11715 "shall not be a coarray", sym->name, &sym->declared_at);
11718 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
11719 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
11720 || sym->attr.allocatable))
11721 gfc_error ("Variable '%s' at %L with coarray component "
11722 "shall be a nonpointer, nonallocatable scalar",
11723 sym->name, &sym->declared_at);
11725 /* F2008, C526. The function-result case was handled above. */
11726 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11727 || sym->attr.codimension)
11728 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
11729 || sym->ns->proc_name->attr.flavor == FL_MODULE
11730 || sym->ns->proc_name->attr.is_main_program
11731 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
11732 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
11733 "component and is not ALLOCATABLE, SAVE nor a "
11734 "dummy argument", sym->name, &sym->declared_at);
11735 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
11736 else if (sym->attr.codimension && !sym->attr.allocatable
11737 && sym->as && sym->as->cotype == AS_DEFERRED)
11738 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
11739 "deferred shape", sym->name, &sym->declared_at);
11740 else if (sym->attr.codimension && sym->attr.allocatable
11741 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
11742 gfc_error ("Allocatable coarray variable '%s' at %L must have "
11743 "deferred shape", sym->name, &sym->declared_at);
11747 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
11748 || (sym->attr.codimension && sym->attr.allocatable))
11749 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
11750 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
11751 "allocatable coarray or have coarray components",
11752 sym->name, &sym->declared_at);
11754 if (sym->attr.codimension && sym->attr.dummy
11755 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
11756 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
11757 "procedure '%s'", sym->name, &sym->declared_at,
11758 sym->ns->proc_name->name);
11760 switch (sym->attr.flavor)
11763 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
11768 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
11773 if (resolve_fl_namelist (sym) == FAILURE)
11778 if (resolve_fl_parameter (sym) == FAILURE)
11786 /* Resolve array specifier. Check as well some constraints
11787 on COMMON blocks. */
11789 check_constant = sym->attr.in_common && !sym->attr.pointer;
11791 /* Set the formal_arg_flag so that check_conflict will not throw
11792 an error for host associated variables in the specification
11793 expression for an array_valued function. */
11794 if (sym->attr.function && sym->as)
11795 formal_arg_flag = 1;
11797 gfc_resolve_array_spec (sym->as, check_constant);
11799 formal_arg_flag = 0;
11801 /* Resolve formal namespaces. */
11802 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
11803 && !sym->attr.contained && !sym->attr.intrinsic)
11804 gfc_resolve (sym->formal_ns);
11806 /* Make sure the formal namespace is present. */
11807 if (sym->formal && !sym->formal_ns)
11809 gfc_formal_arglist *formal = sym->formal;
11810 while (formal && !formal->sym)
11811 formal = formal->next;
11815 sym->formal_ns = formal->sym->ns;
11816 sym->formal_ns->refs++;
11820 /* Check threadprivate restrictions. */
11821 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
11822 && (!sym->attr.in_common
11823 && sym->module == NULL
11824 && (sym->ns->proc_name == NULL
11825 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
11826 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
11828 /* If we have come this far we can apply default-initializers, as
11829 described in 14.7.5, to those variables that have not already
11830 been assigned one. */
11831 if (sym->ts.type == BT_DERIVED
11832 && sym->attr.referenced
11833 && sym->ns == gfc_current_ns
11835 && !sym->attr.allocatable
11836 && !sym->attr.alloc_comp)
11838 symbol_attribute *a = &sym->attr;
11840 if ((!a->save && !a->dummy && !a->pointer
11841 && !a->in_common && !a->use_assoc
11842 && !(a->function && sym != sym->result))
11843 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
11844 apply_default_init (sym);
11847 /* If this symbol has a type-spec, check it. */
11848 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
11849 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
11850 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
11856 /************* Resolve DATA statements *************/
11860 gfc_data_value *vnode;
11866 /* Advance the values structure to point to the next value in the data list. */
11869 next_data_value (void)
11871 while (mpz_cmp_ui (values.left, 0) == 0)
11874 if (values.vnode->next == NULL)
11877 values.vnode = values.vnode->next;
11878 mpz_set (values.left, values.vnode->repeat);
11886 check_data_variable (gfc_data_variable *var, locus *where)
11892 ar_type mark = AR_UNKNOWN;
11894 mpz_t section_index[GFC_MAX_DIMENSIONS];
11900 if (gfc_resolve_expr (var->expr) == FAILURE)
11904 mpz_init_set_si (offset, 0);
11907 if (e->expr_type != EXPR_VARIABLE)
11908 gfc_internal_error ("check_data_variable(): Bad expression");
11910 sym = e->symtree->n.sym;
11912 if (sym->ns->is_block_data && !sym->attr.in_common)
11914 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
11915 sym->name, &sym->declared_at);
11918 if (e->ref == NULL && sym->as)
11920 gfc_error ("DATA array '%s' at %L must be specified in a previous"
11921 " declaration", sym->name, where);
11925 has_pointer = sym->attr.pointer;
11927 for (ref = e->ref; ref; ref = ref->next)
11929 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
11932 if (ref->type == REF_ARRAY && ref->u.ar.codimen)
11934 gfc_error ("DATA element '%s' at %L cannot have a coindex",
11940 && ref->type == REF_ARRAY
11941 && ref->u.ar.type != AR_FULL)
11943 gfc_error ("DATA element '%s' at %L is a pointer and so must "
11944 "be a full array", sym->name, where);
11949 if (e->rank == 0 || has_pointer)
11951 mpz_init_set_ui (size, 1);
11958 /* Find the array section reference. */
11959 for (ref = e->ref; ref; ref = ref->next)
11961 if (ref->type != REF_ARRAY)
11963 if (ref->u.ar.type == AR_ELEMENT)
11969 /* Set marks according to the reference pattern. */
11970 switch (ref->u.ar.type)
11978 /* Get the start position of array section. */
11979 gfc_get_section_index (ar, section_index, &offset);
11984 gcc_unreachable ();
11987 if (gfc_array_size (e, &size) == FAILURE)
11989 gfc_error ("Nonconstant array section at %L in DATA statement",
11991 mpz_clear (offset);
11998 while (mpz_cmp_ui (size, 0) > 0)
12000 if (next_data_value () == FAILURE)
12002 gfc_error ("DATA statement at %L has more variables than values",
12008 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12012 /* If we have more than one element left in the repeat count,
12013 and we have more than one element left in the target variable,
12014 then create a range assignment. */
12015 /* FIXME: Only done for full arrays for now, since array sections
12017 if (mark == AR_FULL && ref && ref->next == NULL
12018 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12022 if (mpz_cmp (size, values.left) >= 0)
12024 mpz_init_set (range, values.left);
12025 mpz_sub (size, size, values.left);
12026 mpz_set_ui (values.left, 0);
12030 mpz_init_set (range, size);
12031 mpz_sub (values.left, values.left, size);
12032 mpz_set_ui (size, 0);
12035 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
12038 mpz_add (offset, offset, range);
12045 /* Assign initial value to symbol. */
12048 mpz_sub_ui (values.left, values.left, 1);
12049 mpz_sub_ui (size, size, 1);
12051 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
12055 if (mark == AR_FULL)
12056 mpz_add_ui (offset, offset, 1);
12058 /* Modify the array section indexes and recalculate the offset
12059 for next element. */
12060 else if (mark == AR_SECTION)
12061 gfc_advance_section (section_index, ar, &offset);
12065 if (mark == AR_SECTION)
12067 for (i = 0; i < ar->dimen; i++)
12068 mpz_clear (section_index[i]);
12072 mpz_clear (offset);
12078 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12080 /* Iterate over a list of elements in a DATA statement. */
12083 traverse_data_list (gfc_data_variable *var, locus *where)
12086 iterator_stack frame;
12087 gfc_expr *e, *start, *end, *step;
12088 gfc_try retval = SUCCESS;
12090 mpz_init (frame.value);
12093 start = gfc_copy_expr (var->iter.start);
12094 end = gfc_copy_expr (var->iter.end);
12095 step = gfc_copy_expr (var->iter.step);
12097 if (gfc_simplify_expr (start, 1) == FAILURE
12098 || start->expr_type != EXPR_CONSTANT)
12100 gfc_error ("start of implied-do loop at %L could not be "
12101 "simplified to a constant value", &start->where);
12105 if (gfc_simplify_expr (end, 1) == FAILURE
12106 || end->expr_type != EXPR_CONSTANT)
12108 gfc_error ("end of implied-do loop at %L could not be "
12109 "simplified to a constant value", &start->where);
12113 if (gfc_simplify_expr (step, 1) == FAILURE
12114 || step->expr_type != EXPR_CONSTANT)
12116 gfc_error ("step of implied-do loop at %L could not be "
12117 "simplified to a constant value", &start->where);
12122 mpz_set (trip, end->value.integer);
12123 mpz_sub (trip, trip, start->value.integer);
12124 mpz_add (trip, trip, step->value.integer);
12126 mpz_div (trip, trip, step->value.integer);
12128 mpz_set (frame.value, start->value.integer);
12130 frame.prev = iter_stack;
12131 frame.variable = var->iter.var->symtree;
12132 iter_stack = &frame;
12134 while (mpz_cmp_ui (trip, 0) > 0)
12136 if (traverse_data_var (var->list, where) == FAILURE)
12142 e = gfc_copy_expr (var->expr);
12143 if (gfc_simplify_expr (e, 1) == FAILURE)
12150 mpz_add (frame.value, frame.value, step->value.integer);
12152 mpz_sub_ui (trip, trip, 1);
12156 mpz_clear (frame.value);
12159 gfc_free_expr (start);
12160 gfc_free_expr (end);
12161 gfc_free_expr (step);
12163 iter_stack = frame.prev;
12168 /* Type resolve variables in the variable list of a DATA statement. */
12171 traverse_data_var (gfc_data_variable *var, locus *where)
12175 for (; var; var = var->next)
12177 if (var->expr == NULL)
12178 t = traverse_data_list (var, where);
12180 t = check_data_variable (var, where);
12190 /* Resolve the expressions and iterators associated with a data statement.
12191 This is separate from the assignment checking because data lists should
12192 only be resolved once. */
12195 resolve_data_variables (gfc_data_variable *d)
12197 for (; d; d = d->next)
12199 if (d->list == NULL)
12201 if (gfc_resolve_expr (d->expr) == FAILURE)
12206 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12209 if (resolve_data_variables (d->list) == FAILURE)
12218 /* Resolve a single DATA statement. We implement this by storing a pointer to
12219 the value list into static variables, and then recursively traversing the
12220 variables list, expanding iterators and such. */
12223 resolve_data (gfc_data *d)
12226 if (resolve_data_variables (d->var) == FAILURE)
12229 values.vnode = d->value;
12230 if (d->value == NULL)
12231 mpz_set_ui (values.left, 0);
12233 mpz_set (values.left, d->value->repeat);
12235 if (traverse_data_var (d->var, &d->where) == FAILURE)
12238 /* At this point, we better not have any values left. */
12240 if (next_data_value () == SUCCESS)
12241 gfc_error ("DATA statement at %L has more values than variables",
12246 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12247 accessed by host or use association, is a dummy argument to a pure function,
12248 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12249 is storage associated with any such variable, shall not be used in the
12250 following contexts: (clients of this function). */
12252 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12253 procedure. Returns zero if assignment is OK, nonzero if there is a
12256 gfc_impure_variable (gfc_symbol *sym)
12261 if (sym->attr.use_assoc || sym->attr.in_common)
12264 /* Check if the symbol's ns is inside the pure procedure. */
12265 for (ns = gfc_current_ns; ns; ns = ns->parent)
12269 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12273 proc = sym->ns->proc_name;
12274 if (sym->attr.dummy && gfc_pure (proc)
12275 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12277 proc->attr.function))
12280 /* TODO: Sort out what can be storage associated, if anything, and include
12281 it here. In principle equivalences should be scanned but it does not
12282 seem to be possible to storage associate an impure variable this way. */
12287 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12288 current namespace is inside a pure procedure. */
12291 gfc_pure (gfc_symbol *sym)
12293 symbol_attribute attr;
12298 /* Check if the current namespace or one of its parents
12299 belongs to a pure procedure. */
12300 for (ns = gfc_current_ns; ns; ns = ns->parent)
12302 sym = ns->proc_name;
12306 if (attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental))
12314 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
12318 /* Test whether the current procedure is elemental or not. */
12321 gfc_elemental (gfc_symbol *sym)
12323 symbol_attribute attr;
12326 sym = gfc_current_ns->proc_name;
12331 return attr.flavor == FL_PROCEDURE && attr.elemental;
12335 /* Warn about unused labels. */
12338 warn_unused_fortran_label (gfc_st_label *label)
12343 warn_unused_fortran_label (label->left);
12345 if (label->defined == ST_LABEL_UNKNOWN)
12348 switch (label->referenced)
12350 case ST_LABEL_UNKNOWN:
12351 gfc_warning ("Label %d at %L defined but not used", label->value,
12355 case ST_LABEL_BAD_TARGET:
12356 gfc_warning ("Label %d at %L defined but cannot be used",
12357 label->value, &label->where);
12364 warn_unused_fortran_label (label->right);
12368 /* Returns the sequence type of a symbol or sequence. */
12371 sequence_type (gfc_typespec ts)
12380 if (ts.u.derived->components == NULL)
12381 return SEQ_NONDEFAULT;
12383 result = sequence_type (ts.u.derived->components->ts);
12384 for (c = ts.u.derived->components->next; c; c = c->next)
12385 if (sequence_type (c->ts) != result)
12391 if (ts.kind != gfc_default_character_kind)
12392 return SEQ_NONDEFAULT;
12394 return SEQ_CHARACTER;
12397 if (ts.kind != gfc_default_integer_kind)
12398 return SEQ_NONDEFAULT;
12400 return SEQ_NUMERIC;
12403 if (!(ts.kind == gfc_default_real_kind
12404 || ts.kind == gfc_default_double_kind))
12405 return SEQ_NONDEFAULT;
12407 return SEQ_NUMERIC;
12410 if (ts.kind != gfc_default_complex_kind)
12411 return SEQ_NONDEFAULT;
12413 return SEQ_NUMERIC;
12416 if (ts.kind != gfc_default_logical_kind)
12417 return SEQ_NONDEFAULT;
12419 return SEQ_NUMERIC;
12422 return SEQ_NONDEFAULT;
12427 /* Resolve derived type EQUIVALENCE object. */
12430 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
12432 gfc_component *c = derived->components;
12437 /* Shall not be an object of nonsequence derived type. */
12438 if (!derived->attr.sequence)
12440 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
12441 "attribute to be an EQUIVALENCE object", sym->name,
12446 /* Shall not have allocatable components. */
12447 if (derived->attr.alloc_comp)
12449 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
12450 "components to be an EQUIVALENCE object",sym->name,
12455 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
12457 gfc_error ("Derived type variable '%s' at %L with default "
12458 "initialization cannot be in EQUIVALENCE with a variable "
12459 "in COMMON", sym->name, &e->where);
12463 for (; c ; c = c->next)
12465 if (c->ts.type == BT_DERIVED
12466 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
12469 /* Shall not be an object of sequence derived type containing a pointer
12470 in the structure. */
12471 if (c->attr.pointer)
12473 gfc_error ("Derived type variable '%s' at %L with pointer "
12474 "component(s) cannot be an EQUIVALENCE object",
12475 sym->name, &e->where);
12483 /* Resolve equivalence object.
12484 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
12485 an allocatable array, an object of nonsequence derived type, an object of
12486 sequence derived type containing a pointer at any level of component
12487 selection, an automatic object, a function name, an entry name, a result
12488 name, a named constant, a structure component, or a subobject of any of
12489 the preceding objects. A substring shall not have length zero. A
12490 derived type shall not have components with default initialization nor
12491 shall two objects of an equivalence group be initialized.
12492 Either all or none of the objects shall have an protected attribute.
12493 The simple constraints are done in symbol.c(check_conflict) and the rest
12494 are implemented here. */
12497 resolve_equivalence (gfc_equiv *eq)
12500 gfc_symbol *first_sym;
12503 locus *last_where = NULL;
12504 seq_type eq_type, last_eq_type;
12505 gfc_typespec *last_ts;
12506 int object, cnt_protected;
12509 last_ts = &eq->expr->symtree->n.sym->ts;
12511 first_sym = eq->expr->symtree->n.sym;
12515 for (object = 1; eq; eq = eq->eq, object++)
12519 e->ts = e->symtree->n.sym->ts;
12520 /* match_varspec might not know yet if it is seeing
12521 array reference or substring reference, as it doesn't
12523 if (e->ref && e->ref->type == REF_ARRAY)
12525 gfc_ref *ref = e->ref;
12526 sym = e->symtree->n.sym;
12528 if (sym->attr.dimension)
12530 ref->u.ar.as = sym->as;
12534 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
12535 if (e->ts.type == BT_CHARACTER
12537 && ref->type == REF_ARRAY
12538 && ref->u.ar.dimen == 1
12539 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
12540 && ref->u.ar.stride[0] == NULL)
12542 gfc_expr *start = ref->u.ar.start[0];
12543 gfc_expr *end = ref->u.ar.end[0];
12546 /* Optimize away the (:) reference. */
12547 if (start == NULL && end == NULL)
12550 e->ref = ref->next;
12552 e->ref->next = ref->next;
12557 ref->type = REF_SUBSTRING;
12559 start = gfc_get_int_expr (gfc_default_integer_kind,
12561 ref->u.ss.start = start;
12562 if (end == NULL && e->ts.u.cl)
12563 end = gfc_copy_expr (e->ts.u.cl->length);
12564 ref->u.ss.end = end;
12565 ref->u.ss.length = e->ts.u.cl;
12572 /* Any further ref is an error. */
12575 gcc_assert (ref->type == REF_ARRAY);
12576 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
12582 if (gfc_resolve_expr (e) == FAILURE)
12585 sym = e->symtree->n.sym;
12587 if (sym->attr.is_protected)
12589 if (cnt_protected > 0 && cnt_protected != object)
12591 gfc_error ("Either all or none of the objects in the "
12592 "EQUIVALENCE set at %L shall have the "
12593 "PROTECTED attribute",
12598 /* Shall not equivalence common block variables in a PURE procedure. */
12599 if (sym->ns->proc_name
12600 && sym->ns->proc_name->attr.pure
12601 && sym->attr.in_common)
12603 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
12604 "object in the pure procedure '%s'",
12605 sym->name, &e->where, sym->ns->proc_name->name);
12609 /* Shall not be a named constant. */
12610 if (e->expr_type == EXPR_CONSTANT)
12612 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
12613 "object", sym->name, &e->where);
12617 if (e->ts.type == BT_DERIVED
12618 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
12621 /* Check that the types correspond correctly:
12623 A numeric sequence structure may be equivalenced to another sequence
12624 structure, an object of default integer type, default real type, double
12625 precision real type, default logical type such that components of the
12626 structure ultimately only become associated to objects of the same
12627 kind. A character sequence structure may be equivalenced to an object
12628 of default character kind or another character sequence structure.
12629 Other objects may be equivalenced only to objects of the same type and
12630 kind parameters. */
12632 /* Identical types are unconditionally OK. */
12633 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
12634 goto identical_types;
12636 last_eq_type = sequence_type (*last_ts);
12637 eq_type = sequence_type (sym->ts);
12639 /* Since the pair of objects is not of the same type, mixed or
12640 non-default sequences can be rejected. */
12642 msg = "Sequence %s with mixed components in EQUIVALENCE "
12643 "statement at %L with different type objects";
12645 && last_eq_type == SEQ_MIXED
12646 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
12648 || (eq_type == SEQ_MIXED
12649 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12650 &e->where) == FAILURE))
12653 msg = "Non-default type object or sequence %s in EQUIVALENCE "
12654 "statement at %L with objects of different type";
12656 && last_eq_type == SEQ_NONDEFAULT
12657 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
12658 last_where) == FAILURE)
12659 || (eq_type == SEQ_NONDEFAULT
12660 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12661 &e->where) == FAILURE))
12664 msg ="Non-CHARACTER object '%s' in default CHARACTER "
12665 "EQUIVALENCE statement at %L";
12666 if (last_eq_type == SEQ_CHARACTER
12667 && eq_type != SEQ_CHARACTER
12668 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12669 &e->where) == FAILURE)
12672 msg ="Non-NUMERIC object '%s' in default NUMERIC "
12673 "EQUIVALENCE statement at %L";
12674 if (last_eq_type == SEQ_NUMERIC
12675 && eq_type != SEQ_NUMERIC
12676 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
12677 &e->where) == FAILURE)
12682 last_where = &e->where;
12687 /* Shall not be an automatic array. */
12688 if (e->ref->type == REF_ARRAY
12689 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
12691 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
12692 "an EQUIVALENCE object", sym->name, &e->where);
12699 /* Shall not be a structure component. */
12700 if (r->type == REF_COMPONENT)
12702 gfc_error ("Structure component '%s' at %L cannot be an "
12703 "EQUIVALENCE object",
12704 r->u.c.component->name, &e->where);
12708 /* A substring shall not have length zero. */
12709 if (r->type == REF_SUBSTRING)
12711 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
12713 gfc_error ("Substring at %L has length zero",
12714 &r->u.ss.start->where);
12724 /* Resolve function and ENTRY types, issue diagnostics if needed. */
12727 resolve_fntype (gfc_namespace *ns)
12729 gfc_entry_list *el;
12732 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
12735 /* If there are any entries, ns->proc_name is the entry master
12736 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
12738 sym = ns->entries->sym;
12740 sym = ns->proc_name;
12741 if (sym->result == sym
12742 && sym->ts.type == BT_UNKNOWN
12743 && gfc_set_default_type (sym, 0, NULL) == FAILURE
12744 && !sym->attr.untyped)
12746 gfc_error ("Function '%s' at %L has no IMPLICIT type",
12747 sym->name, &sym->declared_at);
12748 sym->attr.untyped = 1;
12751 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
12752 && !sym->attr.contained
12753 && !gfc_check_access (sym->ts.u.derived->attr.access,
12754 sym->ts.u.derived->ns->default_access)
12755 && gfc_check_access (sym->attr.access, sym->ns->default_access))
12757 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
12758 "%L of PRIVATE type '%s'", sym->name,
12759 &sym->declared_at, sym->ts.u.derived->name);
12763 for (el = ns->entries->next; el; el = el->next)
12765 if (el->sym->result == el->sym
12766 && el->sym->ts.type == BT_UNKNOWN
12767 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
12768 && !el->sym->attr.untyped)
12770 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
12771 el->sym->name, &el->sym->declared_at);
12772 el->sym->attr.untyped = 1;
12778 /* 12.3.2.1.1 Defined operators. */
12781 check_uop_procedure (gfc_symbol *sym, locus where)
12783 gfc_formal_arglist *formal;
12785 if (!sym->attr.function)
12787 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
12788 sym->name, &where);
12792 if (sym->ts.type == BT_CHARACTER
12793 && !(sym->ts.u.cl && sym->ts.u.cl->length)
12794 && !(sym->result && sym->result->ts.u.cl
12795 && sym->result->ts.u.cl->length))
12797 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
12798 "character length", sym->name, &where);
12802 formal = sym->formal;
12803 if (!formal || !formal->sym)
12805 gfc_error ("User operator procedure '%s' at %L must have at least "
12806 "one argument", sym->name, &where);
12810 if (formal->sym->attr.intent != INTENT_IN)
12812 gfc_error ("First argument of operator interface at %L must be "
12813 "INTENT(IN)", &where);
12817 if (formal->sym->attr.optional)
12819 gfc_error ("First argument of operator interface at %L cannot be "
12820 "optional", &where);
12824 formal = formal->next;
12825 if (!formal || !formal->sym)
12828 if (formal->sym->attr.intent != INTENT_IN)
12830 gfc_error ("Second argument of operator interface at %L must be "
12831 "INTENT(IN)", &where);
12835 if (formal->sym->attr.optional)
12837 gfc_error ("Second argument of operator interface at %L cannot be "
12838 "optional", &where);
12844 gfc_error ("Operator interface at %L must have, at most, two "
12845 "arguments", &where);
12853 gfc_resolve_uops (gfc_symtree *symtree)
12855 gfc_interface *itr;
12857 if (symtree == NULL)
12860 gfc_resolve_uops (symtree->left);
12861 gfc_resolve_uops (symtree->right);
12863 for (itr = symtree->n.uop->op; itr; itr = itr->next)
12864 check_uop_procedure (itr->sym, itr->sym->declared_at);
12868 /* Examine all of the expressions associated with a program unit,
12869 assign types to all intermediate expressions, make sure that all
12870 assignments are to compatible types and figure out which names
12871 refer to which functions or subroutines. It doesn't check code
12872 block, which is handled by resolve_code. */
12875 resolve_types (gfc_namespace *ns)
12881 gfc_namespace* old_ns = gfc_current_ns;
12883 /* Check that all IMPLICIT types are ok. */
12884 if (!ns->seen_implicit_none)
12887 for (letter = 0; letter != GFC_LETTERS; ++letter)
12888 if (ns->set_flag[letter]
12889 && resolve_typespec_used (&ns->default_type[letter],
12890 &ns->implicit_loc[letter],
12895 gfc_current_ns = ns;
12897 resolve_entries (ns);
12899 resolve_common_vars (ns->blank_common.head, false);
12900 resolve_common_blocks (ns->common_root);
12902 resolve_contained_functions (ns);
12904 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
12906 for (cl = ns->cl_list; cl; cl = cl->next)
12907 resolve_charlen (cl);
12909 gfc_traverse_ns (ns, resolve_symbol);
12911 resolve_fntype (ns);
12913 for (n = ns->contained; n; n = n->sibling)
12915 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
12916 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
12917 "also be PURE", n->proc_name->name,
12918 &n->proc_name->declared_at);
12924 gfc_check_interfaces (ns);
12926 gfc_traverse_ns (ns, resolve_values);
12932 for (d = ns->data; d; d = d->next)
12936 gfc_traverse_ns (ns, gfc_formalize_init_value);
12938 gfc_traverse_ns (ns, gfc_verify_binding_labels);
12940 if (ns->common_root != NULL)
12941 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
12943 for (eq = ns->equiv; eq; eq = eq->next)
12944 resolve_equivalence (eq);
12946 /* Warn about unused labels. */
12947 if (warn_unused_label)
12948 warn_unused_fortran_label (ns->st_labels);
12950 gfc_resolve_uops (ns->uop_root);
12952 gfc_current_ns = old_ns;
12956 /* Call resolve_code recursively. */
12959 resolve_codes (gfc_namespace *ns)
12962 bitmap_obstack old_obstack;
12964 for (n = ns->contained; n; n = n->sibling)
12967 gfc_current_ns = ns;
12969 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
12970 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
12973 /* Set to an out of range value. */
12974 current_entry_id = -1;
12976 old_obstack = labels_obstack;
12977 bitmap_obstack_initialize (&labels_obstack);
12979 resolve_code (ns->code, ns);
12981 bitmap_obstack_release (&labels_obstack);
12982 labels_obstack = old_obstack;
12986 /* This function is called after a complete program unit has been compiled.
12987 Its purpose is to examine all of the expressions associated with a program
12988 unit, assign types to all intermediate expressions, make sure that all
12989 assignments are to compatible types and figure out which names refer to
12990 which functions or subroutines. */
12993 gfc_resolve (gfc_namespace *ns)
12995 gfc_namespace *old_ns;
12996 code_stack *old_cs_base;
13002 old_ns = gfc_current_ns;
13003 old_cs_base = cs_base;
13005 resolve_types (ns);
13006 resolve_codes (ns);
13008 gfc_current_ns = old_ns;
13009 cs_base = old_cs_base;