1 /* Perform type resolution on the various stuctures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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 /* Types used in equivalence statements. */
35 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
39 /* Stack to keep track of the nesting of blocks as we move through the
40 code. See resolve_branch() and resolve_code(). */
42 typedef struct code_stack
44 struct gfc_code *head, *current, *tail;
45 struct code_stack *prev;
47 /* This bitmap keeps track of the targets valid for a branch from
49 bitmap reachable_labels;
53 static code_stack *cs_base = NULL;
56 /* Nonzero if we're inside a FORALL block. */
58 static int forall_flag;
60 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
62 static int omp_workshare_flag;
64 /* Nonzero if we are processing a formal arglist. The corresponding function
65 resets the flag each time that it is read. */
66 static int formal_arg_flag = 0;
68 /* True if we are resolving a specification expression. */
69 static int specification_expr = 0;
71 /* The id of the last entry seen. */
72 static int current_entry_id;
74 /* We use bitmaps to determine if a branch target is valid. */
75 static bitmap_obstack labels_obstack;
78 gfc_is_formal_arg (void)
80 return formal_arg_flag;
83 /* Resolve types of formal argument lists. These have to be done early so that
84 the formal argument lists of module procedures can be copied to the
85 containing module before the individual procedures are resolved
86 individually. We also resolve argument lists of procedures in interface
87 blocks because they are self-contained scoping units.
89 Since a dummy argument cannot be a non-dummy procedure, the only
90 resort left for untyped names are the IMPLICIT types. */
93 resolve_formal_arglist (gfc_symbol *proc)
95 gfc_formal_arglist *f;
99 if (proc->result != NULL)
104 if (gfc_elemental (proc)
105 || sym->attr.pointer || sym->attr.allocatable
106 || (sym->as && sym->as->rank > 0))
107 proc->attr.always_explicit = 1;
111 for (f = proc->formal; f; f = f->next)
117 /* Alternate return placeholder. */
118 if (gfc_elemental (proc))
119 gfc_error ("Alternate return specifier in elemental subroutine "
120 "'%s' at %L is not allowed", proc->name,
122 if (proc->attr.function)
123 gfc_error ("Alternate return specifier in function "
124 "'%s' at %L is not allowed", proc->name,
129 if (sym->attr.if_source != IFSRC_UNKNOWN)
130 resolve_formal_arglist (sym);
132 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
134 if (gfc_pure (proc) && !gfc_pure (sym))
136 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
137 "also be PURE", sym->name, &sym->declared_at);
141 if (gfc_elemental (proc))
143 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
144 "procedure", &sym->declared_at);
148 if (sym->attr.function
149 && sym->ts.type == BT_UNKNOWN
150 && sym->attr.intrinsic)
152 gfc_intrinsic_sym *isym;
153 isym = gfc_find_function (sym->name);
154 if (isym == NULL || !isym->specific)
156 gfc_error ("Unable to find a specific INTRINSIC procedure "
157 "for the reference '%s' at %L", sym->name,
166 if (sym->ts.type == BT_UNKNOWN)
168 if (!sym->attr.function || sym->result == sym)
169 gfc_set_default_type (sym, 1, sym->ns);
172 gfc_resolve_array_spec (sym->as, 0);
174 /* We can't tell if an array with dimension (:) is assumed or deferred
175 shape until we know if it has the pointer or allocatable attributes.
177 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
178 && !(sym->attr.pointer || sym->attr.allocatable))
180 sym->as->type = AS_ASSUMED_SHAPE;
181 for (i = 0; i < sym->as->rank; i++)
182 sym->as->lower[i] = gfc_int_expr (1);
185 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
186 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
187 || sym->attr.optional)
188 proc->attr.always_explicit = 1;
190 /* If the flavor is unknown at this point, it has to be a variable.
191 A procedure specification would have already set the type. */
193 if (sym->attr.flavor == FL_UNKNOWN)
194 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
196 if (gfc_pure (proc) && !sym->attr.pointer
197 && sym->attr.flavor != FL_PROCEDURE)
199 if (proc->attr.function && sym->attr.intent != INTENT_IN)
200 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
201 "INTENT(IN)", sym->name, proc->name,
204 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
205 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
206 "have its INTENT specified", sym->name, proc->name,
210 if (gfc_elemental (proc))
214 gfc_error ("Argument '%s' of elemental procedure at %L must "
215 "be scalar", sym->name, &sym->declared_at);
219 if (sym->attr.pointer)
221 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
222 "have the POINTER attribute", sym->name,
228 /* Each dummy shall be specified to be scalar. */
229 if (proc->attr.proc == PROC_ST_FUNCTION)
233 gfc_error ("Argument '%s' of statement function at %L must "
234 "be scalar", sym->name, &sym->declared_at);
238 if (sym->ts.type == BT_CHARACTER)
240 gfc_charlen *cl = sym->ts.cl;
241 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
243 gfc_error ("Character-valued argument '%s' of statement "
244 "function at %L must have constant length",
245 sym->name, &sym->declared_at);
255 /* Work function called when searching for symbols that have argument lists
256 associated with them. */
259 find_arglists (gfc_symbol *sym)
261 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
264 resolve_formal_arglist (sym);
268 /* Given a namespace, resolve all formal argument lists within the namespace.
272 resolve_formal_arglists (gfc_namespace *ns)
277 gfc_traverse_ns (ns, find_arglists);
282 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
286 /* If this namespace is not a function, ignore it. */
287 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE))
290 /* Try to find out of what the return type is. */
291 if (sym->result->ts.type == BT_UNKNOWN)
293 t = gfc_set_default_type (sym->result, 0, ns);
295 if (t == FAILURE && !sym->result->attr.untyped)
297 if (sym->result == sym)
298 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
299 sym->name, &sym->declared_at);
301 gfc_error ("Result '%s' of contained function '%s' at %L has "
302 "no IMPLICIT type", sym->result->name, sym->name,
303 &sym->result->declared_at);
304 sym->result->attr.untyped = 1;
308 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
309 type, lists the only ways a character length value of * can be used:
310 dummy arguments of procedures, named constants, and function results
311 in external functions. Internal function results are not on that list;
312 ergo, not permitted. */
314 if (sym->result->ts.type == BT_CHARACTER)
316 gfc_charlen *cl = sym->result->ts.cl;
317 if (!cl || !cl->length)
318 gfc_error ("Character-valued internal function '%s' at %L must "
319 "not be assumed length", sym->name, &sym->declared_at);
324 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
325 introduce duplicates. */
328 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
330 gfc_formal_arglist *f, *new_arglist;
333 for (; new_args != NULL; new_args = new_args->next)
335 new_sym = new_args->sym;
336 /* See if this arg is already in the formal argument list. */
337 for (f = proc->formal; f; f = f->next)
339 if (new_sym == f->sym)
346 /* Add a new argument. Argument order is not important. */
347 new_arglist = gfc_get_formal_arglist ();
348 new_arglist->sym = new_sym;
349 new_arglist->next = proc->formal;
350 proc->formal = new_arglist;
355 /* Flag the arguments that are not present in all entries. */
358 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
360 gfc_formal_arglist *f, *head;
363 for (f = proc->formal; f; f = f->next)
368 for (new_args = head; new_args; new_args = new_args->next)
370 if (new_args->sym == f->sym)
377 f->sym->attr.not_always_present = 1;
382 /* Resolve alternate entry points. If a symbol has multiple entry points we
383 create a new master symbol for the main routine, and turn the existing
384 symbol into an entry point. */
387 resolve_entries (gfc_namespace *ns)
389 gfc_namespace *old_ns;
393 char name[GFC_MAX_SYMBOL_LEN + 1];
394 static int master_count = 0;
396 if (ns->proc_name == NULL)
399 /* No need to do anything if this procedure doesn't have alternate entry
404 /* We may already have resolved alternate entry points. */
405 if (ns->proc_name->attr.entry_master)
408 /* If this isn't a procedure something has gone horribly wrong. */
409 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
411 /* Remember the current namespace. */
412 old_ns = gfc_current_ns;
416 /* Add the main entry point to the list of entry points. */
417 el = gfc_get_entry_list ();
418 el->sym = ns->proc_name;
420 el->next = ns->entries;
422 ns->proc_name->attr.entry = 1;
424 /* If it is a module function, it needs to be in the right namespace
425 so that gfc_get_fake_result_decl can gather up the results. The
426 need for this arose in get_proc_name, where these beasts were
427 left in their own namespace, to keep prior references linked to
428 the entry declaration.*/
429 if (ns->proc_name->attr.function
430 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
433 /* Do the same for entries where the master is not a module
434 procedure. These are retained in the module namespace because
435 of the module procedure declaration. */
436 for (el = el->next; el; el = el->next)
437 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
438 && el->sym->attr.mod_proc)
442 /* Add an entry statement for it. */
449 /* Create a new symbol for the master function. */
450 /* Give the internal function a unique name (within this file).
451 Also include the function name so the user has some hope of figuring
452 out what is going on. */
453 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
454 master_count++, ns->proc_name->name);
455 gfc_get_ha_symbol (name, &proc);
456 gcc_assert (proc != NULL);
458 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
459 if (ns->proc_name->attr.subroutine)
460 gfc_add_subroutine (&proc->attr, proc->name, NULL);
464 gfc_typespec *ts, *fts;
465 gfc_array_spec *as, *fas;
466 gfc_add_function (&proc->attr, proc->name, NULL);
468 fas = ns->entries->sym->as;
469 fas = fas ? fas : ns->entries->sym->result->as;
470 fts = &ns->entries->sym->result->ts;
471 if (fts->type == BT_UNKNOWN)
472 fts = gfc_get_default_type (ns->entries->sym->result, NULL);
473 for (el = ns->entries->next; el; el = el->next)
475 ts = &el->sym->result->ts;
477 as = as ? as : el->sym->result->as;
478 if (ts->type == BT_UNKNOWN)
479 ts = gfc_get_default_type (el->sym->result, NULL);
481 if (! gfc_compare_types (ts, fts)
482 || (el->sym->result->attr.dimension
483 != ns->entries->sym->result->attr.dimension)
484 || (el->sym->result->attr.pointer
485 != ns->entries->sym->result->attr.pointer))
488 else if (as && fas && gfc_compare_array_spec (as, fas) == 0)
489 gfc_error ("Procedure %s at %L has entries with mismatched "
490 "array specifications", ns->entries->sym->name,
491 &ns->entries->sym->declared_at);
496 sym = ns->entries->sym->result;
497 /* All result types the same. */
499 if (sym->attr.dimension)
500 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
501 if (sym->attr.pointer)
502 gfc_add_pointer (&proc->attr, NULL);
506 /* Otherwise the result will be passed through a union by
508 proc->attr.mixed_entry_master = 1;
509 for (el = ns->entries; el; el = el->next)
511 sym = el->sym->result;
512 if (sym->attr.dimension)
514 if (el == ns->entries)
515 gfc_error ("FUNCTION result %s can't be an array in "
516 "FUNCTION %s at %L", sym->name,
517 ns->entries->sym->name, &sym->declared_at);
519 gfc_error ("ENTRY result %s can't be an array in "
520 "FUNCTION %s at %L", sym->name,
521 ns->entries->sym->name, &sym->declared_at);
523 else if (sym->attr.pointer)
525 if (el == ns->entries)
526 gfc_error ("FUNCTION result %s can't be a POINTER in "
527 "FUNCTION %s at %L", sym->name,
528 ns->entries->sym->name, &sym->declared_at);
530 gfc_error ("ENTRY result %s can't be a POINTER in "
531 "FUNCTION %s at %L", sym->name,
532 ns->entries->sym->name, &sym->declared_at);
537 if (ts->type == BT_UNKNOWN)
538 ts = gfc_get_default_type (sym, NULL);
542 if (ts->kind == gfc_default_integer_kind)
546 if (ts->kind == gfc_default_real_kind
547 || ts->kind == gfc_default_double_kind)
551 if (ts->kind == gfc_default_complex_kind)
555 if (ts->kind == gfc_default_logical_kind)
559 /* We will issue error elsewhere. */
567 if (el == ns->entries)
568 gfc_error ("FUNCTION result %s can't be of type %s "
569 "in FUNCTION %s at %L", sym->name,
570 gfc_typename (ts), ns->entries->sym->name,
573 gfc_error ("ENTRY result %s can't be of type %s "
574 "in FUNCTION %s at %L", sym->name,
575 gfc_typename (ts), ns->entries->sym->name,
582 proc->attr.access = ACCESS_PRIVATE;
583 proc->attr.entry_master = 1;
585 /* Merge all the entry point arguments. */
586 for (el = ns->entries; el; el = el->next)
587 merge_argument_lists (proc, el->sym->formal);
589 /* Check the master formal arguments for any that are not
590 present in all entry points. */
591 for (el = ns->entries; el; el = el->next)
592 check_argument_lists (proc, el->sym->formal);
594 /* Use the master function for the function body. */
595 ns->proc_name = proc;
597 /* Finalize the new symbols. */
598 gfc_commit_symbols ();
600 /* Restore the original namespace. */
601 gfc_current_ns = old_ns;
605 /* Resolve common blocks. */
607 resolve_common_blocks (gfc_symtree *common_root)
609 gfc_symbol *sym, *csym;
611 if (common_root == NULL)
614 if (common_root->left)
615 resolve_common_blocks (common_root->left);
616 if (common_root->right)
617 resolve_common_blocks (common_root->right);
619 for (csym = common_root->n.common->head; csym; csym = csym->common_next)
621 if (csym->ts.type == BT_DERIVED
622 && !(csym->ts.derived->attr.sequence
623 || csym->ts.derived->attr.is_bind_c))
625 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
626 "has neither the SEQUENCE nor the BIND(C) "
627 "attribute", csym->name,
630 else if (csym->ts.type == BT_DERIVED
631 && csym->ts.derived->attr.alloc_comp)
633 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
634 "has an ultimate component that is "
635 "allocatable", csym->name,
640 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
644 if (sym->attr.flavor == FL_PARAMETER)
645 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
646 sym->name, &common_root->n.common->where, &sym->declared_at);
648 if (sym->attr.intrinsic)
649 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
650 sym->name, &common_root->n.common->where);
651 else if (sym->attr.result
652 ||(sym->attr.function && gfc_current_ns->proc_name == sym))
653 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
654 "that is also a function result", sym->name,
655 &common_root->n.common->where);
656 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
657 && sym->attr.proc != PROC_ST_FUNCTION)
658 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
659 "that is also a global procedure", sym->name,
660 &common_root->n.common->where);
664 /* Resolve contained function types. Because contained functions can call one
665 another, they have to be worked out before any of the contained procedures
668 The good news is that if a function doesn't already have a type, the only
669 way it can get one is through an IMPLICIT type or a RESULT variable, because
670 by definition contained functions are contained namespace they're contained
671 in, not in a sibling or parent namespace. */
674 resolve_contained_functions (gfc_namespace *ns)
676 gfc_namespace *child;
679 resolve_formal_arglists (ns);
681 for (child = ns->contained; child; child = child->sibling)
683 /* Resolve alternate entry points first. */
684 resolve_entries (child);
686 /* Then check function return types. */
687 resolve_contained_fntype (child->proc_name, child);
688 for (el = child->entries; el; el = el->next)
689 resolve_contained_fntype (el->sym, child);
694 /* Resolve all of the elements of a structure constructor and make sure that
695 the types are correct. */
698 resolve_structure_cons (gfc_expr *expr)
700 gfc_constructor *cons;
706 cons = expr->value.constructor;
707 /* A constructor may have references if it is the result of substituting a
708 parameter variable. In this case we just pull out the component we
711 comp = expr->ref->u.c.sym->components;
713 comp = expr->ts.derived->components;
715 for (; comp; comp = comp->next, cons = cons->next)
720 if (gfc_resolve_expr (cons->expr) == FAILURE)
726 if (cons->expr->expr_type != EXPR_NULL
727 && comp->as && comp->as->rank != cons->expr->rank
728 && (comp->allocatable || cons->expr->rank))
730 gfc_error ("The rank of the element in the derived type "
731 "constructor at %L does not match that of the "
732 "component (%d/%d)", &cons->expr->where,
733 cons->expr->rank, comp->as ? comp->as->rank : 0);
737 /* If we don't have the right type, try to convert it. */
739 if (!gfc_compare_types (&cons->expr->ts, &comp->ts))
742 if (comp->pointer && cons->expr->ts.type != BT_UNKNOWN)
743 gfc_error ("The element in the derived type constructor at %L, "
744 "for pointer component '%s', is %s but should be %s",
745 &cons->expr->where, comp->name,
746 gfc_basic_typename (cons->expr->ts.type),
747 gfc_basic_typename (comp->ts.type));
749 t = gfc_convert_type (cons->expr, &comp->ts, 1);
752 if (!comp->pointer || cons->expr->expr_type == EXPR_NULL)
755 a = gfc_expr_attr (cons->expr);
757 if (!a.pointer && !a.target)
760 gfc_error ("The element in the derived type constructor at %L, "
761 "for pointer component '%s' should be a POINTER or "
762 "a TARGET", &cons->expr->where, comp->name);
770 /****************** Expression name resolution ******************/
772 /* Returns 0 if a symbol was not declared with a type or
773 attribute declaration statement, nonzero otherwise. */
776 was_declared (gfc_symbol *sym)
782 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
785 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
786 || a.optional || a.pointer || a.save || a.target || a.volatile_
787 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN)
794 /* Determine if a symbol is generic or not. */
797 generic_sym (gfc_symbol *sym)
801 if (sym->attr.generic ||
802 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
805 if (was_declared (sym) || sym->ns->parent == NULL)
808 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
815 return generic_sym (s);
822 /* Determine if a symbol is specific or not. */
825 specific_sym (gfc_symbol *sym)
829 if (sym->attr.if_source == IFSRC_IFBODY
830 || sym->attr.proc == PROC_MODULE
831 || sym->attr.proc == PROC_INTERNAL
832 || sym->attr.proc == PROC_ST_FUNCTION
833 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
834 || sym->attr.external)
837 if (was_declared (sym) || sym->ns->parent == NULL)
840 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
842 return (s == NULL) ? 0 : specific_sym (s);
846 /* Figure out if the procedure is specific, generic or unknown. */
849 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
853 procedure_kind (gfc_symbol *sym)
855 if (generic_sym (sym))
856 return PTYPE_GENERIC;
858 if (specific_sym (sym))
859 return PTYPE_SPECIFIC;
861 return PTYPE_UNKNOWN;
864 /* Check references to assumed size arrays. The flag need_full_assumed_size
865 is nonzero when matching actual arguments. */
867 static int need_full_assumed_size = 0;
870 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
876 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
879 for (ref = e->ref; ref; ref = ref->next)
880 if (ref->type == REF_ARRAY)
881 for (dim = 0; dim < ref->u.ar.as->rank; dim++)
882 last = (ref->u.ar.end[dim] == NULL)
883 && (ref->u.ar.type == DIMEN_ELEMENT);
887 gfc_error ("The upper bound in the last dimension must "
888 "appear in the reference to the assumed size "
889 "array '%s' at %L", sym->name, &e->where);
896 /* Look for bad assumed size array references in argument expressions
897 of elemental and array valued intrinsic procedures. Since this is
898 called from procedure resolution functions, it only recurses at
902 resolve_assumed_size_actual (gfc_expr *e)
907 switch (e->expr_type)
910 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
915 if (resolve_assumed_size_actual (e->value.op.op1)
916 || resolve_assumed_size_actual (e->value.op.op2))
927 /* Resolve an actual argument list. Most of the time, this is just
928 resolving the expressions in the list.
929 The exception is that we sometimes have to decide whether arguments
930 that look like procedure arguments are really simple variable
934 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype)
937 gfc_symtree *parent_st;
940 for (; arg; arg = arg->next)
945 /* Check the label is a valid branching target. */
948 if (arg->label->defined == ST_LABEL_UNKNOWN)
950 gfc_error ("Label %d referenced at %L is never defined",
951 arg->label->value, &arg->label->where);
958 if (e->ts.type != BT_PROCEDURE)
960 if (gfc_resolve_expr (e) != SUCCESS)
965 /* See if the expression node should really be a variable reference. */
967 sym = e->symtree->n.sym;
969 if (sym->attr.flavor == FL_PROCEDURE
970 || sym->attr.intrinsic
971 || sym->attr.external)
975 /* If a procedure is not already determined to be something else
976 check if it is intrinsic. */
977 if (!sym->attr.intrinsic
978 && !(sym->attr.external || sym->attr.use_assoc
979 || sym->attr.if_source == IFSRC_IFBODY)
980 && gfc_intrinsic_name (sym->name, sym->attr.subroutine))
981 sym->attr.intrinsic = 1;
983 if (sym->attr.proc == PROC_ST_FUNCTION)
985 gfc_error ("Statement function '%s' at %L is not allowed as an "
986 "actual argument", sym->name, &e->where);
989 actual_ok = gfc_intrinsic_actual_ok (sym->name,
990 sym->attr.subroutine);
991 if (sym->attr.intrinsic && actual_ok == 0)
993 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
994 "actual argument", sym->name, &e->where);
997 if (sym->attr.contained && !sym->attr.use_assoc
998 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1000 gfc_error ("Internal procedure '%s' is not allowed as an "
1001 "actual argument at %L", sym->name, &e->where);
1004 if (sym->attr.elemental && !sym->attr.intrinsic)
1006 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1007 "allowed as an actual argument at %L", sym->name,
1011 /* Check if a generic interface has a specific procedure
1012 with the same name before emitting an error. */
1013 if (sym->attr.generic)
1016 for (p = sym->generic; p; p = p->next)
1017 if (strcmp (sym->name, p->sym->name) == 0)
1019 e->symtree = gfc_find_symtree
1020 (p->sym->ns->sym_root, sym->name);
1025 if (p == NULL || e->symtree == NULL)
1026 gfc_error ("GENERIC non-INTRINSIC procedure '%s' is not "
1027 "allowed as an actual argument at %L", sym->name,
1031 /* If the symbol is the function that names the current (or
1032 parent) scope, then we really have a variable reference. */
1034 if (sym->attr.function && sym->result == sym
1035 && (sym->ns->proc_name == sym
1036 || (sym->ns->parent != NULL
1037 && sym->ns->parent->proc_name == sym)))
1040 /* If all else fails, see if we have a specific intrinsic. */
1041 if (sym->attr.function
1042 && sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1044 gfc_intrinsic_sym *isym;
1045 isym = gfc_find_function (sym->name);
1046 if (isym == NULL || !isym->specific)
1048 gfc_error ("Unable to find a specific INTRINSIC procedure "
1049 "for the reference '%s' at %L", sym->name,
1057 /* See if the name is a module procedure in a parent unit. */
1059 if (was_declared (sym) || sym->ns->parent == NULL)
1062 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1064 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1068 if (parent_st == NULL)
1071 sym = parent_st->n.sym;
1072 e->symtree = parent_st; /* Point to the right thing. */
1074 if (sym->attr.flavor == FL_PROCEDURE
1075 || sym->attr.intrinsic
1076 || sym->attr.external)
1082 e->expr_type = EXPR_VARIABLE;
1084 if (sym->as != NULL)
1086 e->rank = sym->as->rank;
1087 e->ref = gfc_get_ref ();
1088 e->ref->type = REF_ARRAY;
1089 e->ref->u.ar.type = AR_FULL;
1090 e->ref->u.ar.as = sym->as;
1093 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1094 primary.c (match_actual_arg). If above code determines that it
1095 is a variable instead, it needs to be resolved as it was not
1096 done at the beginning of this function. */
1097 if (gfc_resolve_expr (e) != SUCCESS)
1101 /* Check argument list functions %VAL, %LOC and %REF. There is
1102 nothing to do for %REF. */
1103 if (arg->name && arg->name[0] == '%')
1105 if (strncmp ("%VAL", arg->name, 4) == 0)
1107 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1109 gfc_error ("By-value argument at %L is not of numeric "
1116 gfc_error ("By-value argument at %L cannot be an array or "
1117 "an array section", &e->where);
1121 /* Intrinsics are still PROC_UNKNOWN here. However,
1122 since same file external procedures are not resolvable
1123 in gfortran, it is a good deal easier to leave them to
1125 if (ptype != PROC_UNKNOWN
1126 && ptype != PROC_DUMMY
1127 && ptype != PROC_EXTERNAL
1128 && ptype != PROC_MODULE)
1130 gfc_error ("By-value argument at %L is not allowed "
1131 "in this context", &e->where);
1136 /* Statement functions have already been excluded above. */
1137 else if (strncmp ("%LOC", arg->name, 4) == 0
1138 && e->ts.type == BT_PROCEDURE)
1140 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1142 gfc_error ("Passing internal procedure at %L by location "
1143 "not allowed", &e->where);
1154 /* Do the checks of the actual argument list that are specific to elemental
1155 procedures. If called with c == NULL, we have a function, otherwise if
1156 expr == NULL, we have a subroutine. */
1159 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1161 gfc_actual_arglist *arg0;
1162 gfc_actual_arglist *arg;
1163 gfc_symbol *esym = NULL;
1164 gfc_intrinsic_sym *isym = NULL;
1166 gfc_intrinsic_arg *iformal = NULL;
1167 gfc_formal_arglist *eformal = NULL;
1168 bool formal_optional = false;
1169 bool set_by_optional = false;
1173 /* Is this an elemental procedure? */
1174 if (expr && expr->value.function.actual != NULL)
1176 if (expr->value.function.esym != NULL
1177 && expr->value.function.esym->attr.elemental)
1179 arg0 = expr->value.function.actual;
1180 esym = expr->value.function.esym;
1182 else if (expr->value.function.isym != NULL
1183 && expr->value.function.isym->elemental)
1185 arg0 = expr->value.function.actual;
1186 isym = expr->value.function.isym;
1191 else if (c && c->ext.actual != NULL && c->symtree->n.sym->attr.elemental)
1193 arg0 = c->ext.actual;
1194 esym = c->symtree->n.sym;
1199 /* The rank of an elemental is the rank of its array argument(s). */
1200 for (arg = arg0; arg; arg = arg->next)
1202 if (arg->expr != NULL && arg->expr->rank > 0)
1204 rank = arg->expr->rank;
1205 if (arg->expr->expr_type == EXPR_VARIABLE
1206 && arg->expr->symtree->n.sym->attr.optional)
1207 set_by_optional = true;
1209 /* Function specific; set the result rank and shape. */
1213 if (!expr->shape && arg->expr->shape)
1215 expr->shape = gfc_get_shape (rank);
1216 for (i = 0; i < rank; i++)
1217 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1224 /* If it is an array, it shall not be supplied as an actual argument
1225 to an elemental procedure unless an array of the same rank is supplied
1226 as an actual argument corresponding to a nonoptional dummy argument of
1227 that elemental procedure(12.4.1.5). */
1228 formal_optional = false;
1230 iformal = isym->formal;
1232 eformal = esym->formal;
1234 for (arg = arg0; arg; arg = arg->next)
1238 if (eformal->sym && eformal->sym->attr.optional)
1239 formal_optional = true;
1240 eformal = eformal->next;
1242 else if (isym && iformal)
1244 if (iformal->optional)
1245 formal_optional = true;
1246 iformal = iformal->next;
1249 formal_optional = true;
1251 if (pedantic && arg->expr != NULL
1252 && arg->expr->expr_type == EXPR_VARIABLE
1253 && arg->expr->symtree->n.sym->attr.optional
1256 && (set_by_optional || arg->expr->rank != rank)
1257 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1259 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1260 "MISSING, it cannot be the actual argument of an "
1261 "ELEMENTAL procedure unless there is a non-optional "
1262 "argument with the same rank (12.4.1.5)",
1263 arg->expr->symtree->n.sym->name, &arg->expr->where);
1268 for (arg = arg0; arg; arg = arg->next)
1270 if (arg->expr == NULL || arg->expr->rank == 0)
1273 /* Being elemental, the last upper bound of an assumed size array
1274 argument must be present. */
1275 if (resolve_assumed_size_actual (arg->expr))
1278 /* Elemental procedure's array actual arguments must conform. */
1281 if (gfc_check_conformance ("elemental procedure", arg->expr, e)
1293 /* Go through each actual argument in ACTUAL and see if it can be
1294 implemented as an inlined, non-copying intrinsic. FNSYM is the
1295 function being called, or NULL if not known. */
1298 find_noncopying_intrinsics (gfc_symbol *fnsym, gfc_actual_arglist *actual)
1300 gfc_actual_arglist *ap;
1303 for (ap = actual; ap; ap = ap->next)
1305 && (expr = gfc_get_noncopying_intrinsic_argument (ap->expr))
1306 && !gfc_check_fncall_dependency (expr, INTENT_IN, fnsym, actual))
1307 ap->expr->inline_noncopying_intrinsic = 1;
1311 /* This function does the checking of references to global procedures
1312 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1313 77 and 95 standards. It checks for a gsymbol for the name, making
1314 one if it does not already exist. If it already exists, then the
1315 reference being resolved must correspond to the type of gsymbol.
1316 Otherwise, the new symbol is equipped with the attributes of the
1317 reference. The corresponding code that is called in creating
1318 global entities is parse.c. */
1321 resolve_global_procedure (gfc_symbol *sym, locus *where, int sub)
1326 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
1328 gsym = gfc_get_gsymbol (sym->name);
1330 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
1331 global_used (gsym, where);
1333 if (gsym->type == GSYM_UNKNOWN)
1336 gsym->where = *where;
1343 /************* Function resolution *************/
1345 /* Resolve a function call known to be generic.
1346 Section 14.1.2.4.1. */
1349 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
1353 if (sym->attr.generic)
1355 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
1358 expr->value.function.name = s->name;
1359 expr->value.function.esym = s;
1361 if (s->ts.type != BT_UNKNOWN)
1363 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
1364 expr->ts = s->result->ts;
1367 expr->rank = s->as->rank;
1368 else if (s->result != NULL && s->result->as != NULL)
1369 expr->rank = s->result->as->rank;
1374 /* TODO: Need to search for elemental references in generic
1378 if (sym->attr.intrinsic)
1379 return gfc_intrinsic_func_interface (expr, 0);
1386 resolve_generic_f (gfc_expr *expr)
1391 sym = expr->symtree->n.sym;
1395 m = resolve_generic_f0 (expr, sym);
1398 else if (m == MATCH_ERROR)
1402 if (sym->ns->parent == NULL)
1404 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1408 if (!generic_sym (sym))
1412 /* Last ditch attempt. See if the reference is to an intrinsic
1413 that possesses a matching interface. 14.1.2.4 */
1414 if (sym && !gfc_intrinsic_name (sym->name, 0))
1416 gfc_error ("There is no specific function for the generic '%s' at %L",
1417 expr->symtree->n.sym->name, &expr->where);
1421 m = gfc_intrinsic_func_interface (expr, 0);
1425 gfc_error ("Generic function '%s' at %L is not consistent with a "
1426 "specific intrinsic interface", expr->symtree->n.sym->name,
1433 /* Resolve a function call known to be specific. */
1436 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
1440 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
1442 if (sym->attr.dummy)
1444 sym->attr.proc = PROC_DUMMY;
1448 sym->attr.proc = PROC_EXTERNAL;
1452 if (sym->attr.proc == PROC_MODULE
1453 || sym->attr.proc == PROC_ST_FUNCTION
1454 || sym->attr.proc == PROC_INTERNAL)
1457 if (sym->attr.intrinsic)
1459 m = gfc_intrinsic_func_interface (expr, 1);
1463 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
1464 "with an intrinsic", sym->name, &expr->where);
1472 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1475 expr->value.function.name = sym->name;
1476 expr->value.function.esym = sym;
1477 if (sym->as != NULL)
1478 expr->rank = sym->as->rank;
1485 resolve_specific_f (gfc_expr *expr)
1490 sym = expr->symtree->n.sym;
1494 m = resolve_specific_f0 (sym, expr);
1497 if (m == MATCH_ERROR)
1500 if (sym->ns->parent == NULL)
1503 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
1509 gfc_error ("Unable to resolve the specific function '%s' at %L",
1510 expr->symtree->n.sym->name, &expr->where);
1516 /* Resolve a procedure call not known to be generic nor specific. */
1519 resolve_unknown_f (gfc_expr *expr)
1524 sym = expr->symtree->n.sym;
1526 if (sym->attr.dummy)
1528 sym->attr.proc = PROC_DUMMY;
1529 expr->value.function.name = sym->name;
1533 /* See if we have an intrinsic function reference. */
1535 if (gfc_intrinsic_name (sym->name, 0))
1537 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
1542 /* The reference is to an external name. */
1544 sym->attr.proc = PROC_EXTERNAL;
1545 expr->value.function.name = sym->name;
1546 expr->value.function.esym = expr->symtree->n.sym;
1548 if (sym->as != NULL)
1549 expr->rank = sym->as->rank;
1551 /* Type of the expression is either the type of the symbol or the
1552 default type of the symbol. */
1555 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
1557 if (sym->ts.type != BT_UNKNOWN)
1561 ts = gfc_get_default_type (sym, sym->ns);
1563 if (ts->type == BT_UNKNOWN)
1565 gfc_error ("Function '%s' at %L has no IMPLICIT type",
1566 sym->name, &expr->where);
1577 /* Return true, if the symbol is an external procedure. */
1579 is_external_proc (gfc_symbol *sym)
1581 if (!sym->attr.dummy && !sym->attr.contained
1582 && !(sym->attr.intrinsic
1583 || gfc_intrinsic_name (sym->name, sym->attr.subroutine))
1584 && sym->attr.proc != PROC_ST_FUNCTION
1585 && !sym->attr.use_assoc
1593 /* Figure out if a function reference is pure or not. Also set the name
1594 of the function for a potential error message. Return nonzero if the
1595 function is PURE, zero if not. */
1598 pure_function (gfc_expr *e, const char **name)
1604 if (e->symtree != NULL
1605 && e->symtree->n.sym != NULL
1606 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
1609 if (e->value.function.esym)
1611 pure = gfc_pure (e->value.function.esym);
1612 *name = e->value.function.esym->name;
1614 else if (e->value.function.isym)
1616 pure = e->value.function.isym->pure
1617 || e->value.function.isym->elemental;
1618 *name = e->value.function.isym->name;
1622 /* Implicit functions are not pure. */
1624 *name = e->value.function.name;
1632 is_scalar_expr_ptr (gfc_expr *expr)
1634 try retval = SUCCESS;
1639 /* See if we have a gfc_ref, which means we have a substring, array
1640 reference, or a component. */
1641 if (expr->ref != NULL)
1644 while (ref->next != NULL)
1650 if (ref->u.ss.length != NULL
1651 && ref->u.ss.length->length != NULL
1653 && ref->u.ss.start->expr_type == EXPR_CONSTANT
1655 && ref->u.ss.end->expr_type == EXPR_CONSTANT)
1657 start = (int) mpz_get_si (ref->u.ss.start->value.integer);
1658 end = (int) mpz_get_si (ref->u.ss.end->value.integer);
1659 if (end - start + 1 != 1)
1666 if (ref->u.ar.type == AR_ELEMENT)
1668 else if (ref->u.ar.type == AR_FULL)
1670 /* The user can give a full array if the array is of size 1. */
1671 if (ref->u.ar.as != NULL
1672 && ref->u.ar.as->rank == 1
1673 && ref->u.ar.as->type == AS_EXPLICIT
1674 && ref->u.ar.as->lower[0] != NULL
1675 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
1676 && ref->u.ar.as->upper[0] != NULL
1677 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
1679 /* If we have a character string, we need to check if
1680 its length is one. */
1681 if (expr->ts.type == BT_CHARACTER)
1683 if (expr->ts.cl == NULL
1684 || expr->ts.cl->length == NULL
1685 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1)
1691 /* We have constant lower and upper bounds. If the
1692 difference between is 1, it can be considered a
1694 start = (int) mpz_get_si
1695 (ref->u.ar.as->lower[0]->value.integer);
1696 end = (int) mpz_get_si
1697 (ref->u.ar.as->upper[0]->value.integer);
1698 if (end - start + 1 != 1)
1713 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
1715 /* Character string. Make sure it's of length 1. */
1716 if (expr->ts.cl == NULL
1717 || expr->ts.cl->length == NULL
1718 || mpz_cmp_si (expr->ts.cl->length->value.integer, 1) != 0)
1721 else if (expr->rank != 0)
1728 /* Match one of the iso_c_binding functions (c_associated or c_loc)
1729 and, in the case of c_associated, set the binding label based on
1733 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
1734 gfc_symbol **new_sym)
1736 char name[GFC_MAX_SYMBOL_LEN + 1];
1737 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
1738 int optional_arg = 0;
1739 try retval = SUCCESS;
1740 gfc_symbol *args_sym;
1742 if (args->expr->expr_type == EXPR_CONSTANT
1743 || args->expr->expr_type == EXPR_OP
1744 || args->expr->expr_type == EXPR_NULL)
1746 gfc_error ("Argument to '%s' at %L is not a variable",
1747 sym->name, &(args->expr->where));
1751 args_sym = args->expr->symtree->n.sym;
1753 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
1755 /* If the user gave two args then they are providing something for
1756 the optional arg (the second cptr). Therefore, set the name and
1757 binding label to the c_associated for two cptrs. Otherwise,
1758 set c_associated to expect one cptr. */
1762 sprintf (name, "%s_2", sym->name);
1763 sprintf (binding_label, "%s_2", sym->binding_label);
1769 sprintf (name, "%s_1", sym->name);
1770 sprintf (binding_label, "%s_1", sym->binding_label);
1774 /* Get a new symbol for the version of c_associated that
1776 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
1778 else if (sym->intmod_sym_id == ISOCBINDING_LOC
1779 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
1781 sprintf (name, "%s", sym->name);
1782 sprintf (binding_label, "%s", sym->binding_label);
1784 /* Error check the call. */
1785 if (args->next != NULL)
1787 gfc_error_now ("More actual than formal arguments in '%s' "
1788 "call at %L", name, &(args->expr->where));
1791 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
1793 /* Make sure we have either the target or pointer attribute. */
1794 if (!(args->expr->symtree->n.sym->attr.target)
1795 && !(args->expr->symtree->n.sym->attr.pointer))
1797 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
1798 "a TARGET or an associated pointer",
1799 args->expr->symtree->n.sym->name,
1800 sym->name, &(args->expr->where));
1804 /* See if we have interoperable type and type param. */
1805 if (verify_c_interop (&(args->expr->symtree->n.sym->ts),
1806 args->expr->symtree->n.sym->name,
1807 &(args->expr->where)) == SUCCESS
1808 || gfc_check_any_c_kind (&(args_sym->ts)) == SUCCESS)
1810 if (args_sym->attr.target == 1)
1812 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
1813 has the target attribute and is interoperable. */
1814 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
1815 allocatable variable that has the TARGET attribute and
1816 is not an array of zero size. */
1817 if (args_sym->attr.allocatable == 1)
1819 if (args_sym->attr.dimension != 0
1820 && (args_sym->as && args_sym->as->rank == 0))
1822 gfc_error_now ("Allocatable variable '%s' used as a "
1823 "parameter to '%s' at %L must not be "
1824 "an array of zero size",
1825 args_sym->name, sym->name,
1826 &(args->expr->where));
1832 /* A non-allocatable target variable with C
1833 interoperable type and type parameters must be
1835 if (args_sym && args_sym->attr.dimension)
1837 if (args_sym->as->type == AS_ASSUMED_SHAPE)
1839 gfc_error ("Assumed-shape array '%s' at %L "
1840 "cannot be an argument to the "
1841 "procedure '%s' because "
1842 "it is not C interoperable",
1844 &(args->expr->where), sym->name);
1847 else if (args_sym->as->type == AS_DEFERRED)
1849 gfc_error ("Deferred-shape array '%s' at %L "
1850 "cannot be an argument to the "
1851 "procedure '%s' because "
1852 "it is not C interoperable",
1854 &(args->expr->where), sym->name);
1859 /* Make sure it's not a character string. Arrays of
1860 any type should be ok if the variable is of a C
1861 interoperable type. */
1862 if (args_sym->ts.type == BT_CHARACTER)
1863 if (args_sym->ts.cl != NULL
1864 && (args_sym->ts.cl->length == NULL
1865 || args_sym->ts.cl->length->expr_type
1868 (args_sym->ts.cl->length->value.integer, 1)
1870 && is_scalar_expr_ptr (args->expr) != SUCCESS)
1872 gfc_error_now ("CHARACTER argument '%s' to '%s' "
1873 "at %L must have a length of 1",
1874 args_sym->name, sym->name,
1875 &(args->expr->where));
1880 else if (args_sym->attr.pointer == 1
1881 && is_scalar_expr_ptr (args->expr) != SUCCESS)
1883 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
1885 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
1886 "associated scalar POINTER", args_sym->name,
1887 sym->name, &(args->expr->where));
1893 /* The parameter is not required to be C interoperable. If it
1894 is not C interoperable, it must be a nonpolymorphic scalar
1895 with no length type parameters. It still must have either
1896 the pointer or target attribute, and it can be
1897 allocatable (but must be allocated when c_loc is called). */
1898 if (args_sym->attr.dimension != 0
1899 && is_scalar_expr_ptr (args->expr) != SUCCESS)
1901 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
1902 "scalar", args_sym->name, sym->name,
1903 &(args->expr->where));
1906 else if (args_sym->ts.type == BT_CHARACTER
1907 && is_scalar_expr_ptr (args->expr) != SUCCESS)
1909 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
1910 "%L must have a length of 1",
1911 args_sym->name, sym->name,
1912 &(args->expr->where));
1917 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
1919 if (args->expr->symtree->n.sym->attr.flavor != FL_PROCEDURE)
1921 /* TODO: Update this error message to allow for procedure
1922 pointers once they are implemented. */
1923 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
1925 args->expr->symtree->n.sym->name, sym->name,
1926 &(args->expr->where));
1929 else if (args->expr->symtree->n.sym->attr.is_bind_c != 1)
1931 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
1933 args->expr->symtree->n.sym->name, sym->name,
1934 &(args->expr->where));
1939 /* for c_loc/c_funloc, the new symbol is the same as the old one */
1944 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
1945 "iso_c_binding function: '%s'!\n", sym->name);
1952 /* Resolve a function call, which means resolving the arguments, then figuring
1953 out which entity the name refers to. */
1954 /* TODO: Check procedure arguments so that an INTENT(IN) isn't passed
1955 to INTENT(OUT) or INTENT(INOUT). */
1958 resolve_function (gfc_expr *expr)
1960 gfc_actual_arglist *arg;
1965 procedure_type p = PROC_INTRINSIC;
1969 sym = expr->symtree->n.sym;
1971 if (sym && sym->attr.flavor == FL_VARIABLE)
1973 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
1977 if (sym && sym->attr.abstract)
1979 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
1980 sym->name, &expr->where);
1984 /* If the procedure is external, check for usage. */
1985 if (sym && is_external_proc (sym))
1986 resolve_global_procedure (sym, &expr->where, 0);
1988 /* Switch off assumed size checking and do this again for certain kinds
1989 of procedure, once the procedure itself is resolved. */
1990 need_full_assumed_size++;
1992 if (expr->symtree && expr->symtree->n.sym)
1993 p = expr->symtree->n.sym->attr.proc;
1995 if (resolve_actual_arglist (expr->value.function.actual, p) == FAILURE)
1998 /* Need to setup the call to the correct c_associated, depending on
1999 the number of cptrs to user gives to compare. */
2000 if (sym && sym->attr.is_iso_c == 1)
2002 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
2006 /* Get the symtree for the new symbol (resolved func).
2007 the old one will be freed later, when it's no longer used. */
2008 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
2011 /* Resume assumed_size checking. */
2012 need_full_assumed_size--;
2014 if (sym && sym->ts.type == BT_CHARACTER
2016 && sym->ts.cl->length == NULL
2018 && expr->value.function.esym == NULL
2019 && !sym->attr.contained)
2021 /* Internal procedures are taken care of in resolve_contained_fntype. */
2022 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
2023 "be used at %L since it is not a dummy argument",
2024 sym->name, &expr->where);
2028 /* See if function is already resolved. */
2030 if (expr->value.function.name != NULL)
2032 if (expr->ts.type == BT_UNKNOWN)
2038 /* Apply the rules of section 14.1.2. */
2040 switch (procedure_kind (sym))
2043 t = resolve_generic_f (expr);
2046 case PTYPE_SPECIFIC:
2047 t = resolve_specific_f (expr);
2051 t = resolve_unknown_f (expr);
2055 gfc_internal_error ("resolve_function(): bad function type");
2059 /* If the expression is still a function (it might have simplified),
2060 then we check to see if we are calling an elemental function. */
2062 if (expr->expr_type != EXPR_FUNCTION)
2065 temp = need_full_assumed_size;
2066 need_full_assumed_size = 0;
2068 if (resolve_elemental_actual (expr, NULL) == FAILURE)
2071 if (omp_workshare_flag
2072 && expr->value.function.esym
2073 && ! gfc_elemental (expr->value.function.esym))
2075 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
2076 "in WORKSHARE construct", expr->value.function.esym->name,
2081 #define GENERIC_ID expr->value.function.isym->id
2082 else if (expr->value.function.actual != NULL
2083 && expr->value.function.isym != NULL
2084 && GENERIC_ID != GFC_ISYM_LBOUND
2085 && GENERIC_ID != GFC_ISYM_LEN
2086 && GENERIC_ID != GFC_ISYM_LOC
2087 && GENERIC_ID != GFC_ISYM_PRESENT)
2089 /* Array intrinsics must also have the last upper bound of an
2090 assumed size array argument. UBOUND and SIZE have to be
2091 excluded from the check if the second argument is anything
2094 inquiry = GENERIC_ID == GFC_ISYM_UBOUND
2095 || GENERIC_ID == GFC_ISYM_SIZE;
2097 for (arg = expr->value.function.actual; arg; arg = arg->next)
2099 if (inquiry && arg->next != NULL && arg->next->expr)
2101 if (arg->next->expr->expr_type != EXPR_CONSTANT)
2104 if ((int)mpz_get_si (arg->next->expr->value.integer)
2109 if (arg->expr != NULL
2110 && arg->expr->rank > 0
2111 && resolve_assumed_size_actual (arg->expr))
2117 need_full_assumed_size = temp;
2120 if (!pure_function (expr, &name) && name)
2124 gfc_error ("reference to non-PURE function '%s' at %L inside a "
2125 "FORALL %s", name, &expr->where,
2126 forall_flag == 2 ? "mask" : "block");
2129 else if (gfc_pure (NULL))
2131 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
2132 "procedure within a PURE procedure", name, &expr->where);
2137 /* Functions without the RECURSIVE attribution are not allowed to
2138 * call themselves. */
2139 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
2141 gfc_symbol *esym, *proc;
2142 esym = expr->value.function.esym;
2143 proc = gfc_current_ns->proc_name;
2146 gfc_error ("Function '%s' at %L cannot call itself, as it is not "
2147 "RECURSIVE", name, &expr->where);
2151 if (esym->attr.entry && esym->ns->entries && proc->ns->entries
2152 && esym->ns->entries->sym == proc->ns->entries->sym)
2154 gfc_error ("Call to ENTRY '%s' at %L is recursive, but function "
2155 "'%s' is not declared as RECURSIVE",
2156 esym->name, &expr->where, esym->ns->entries->sym->name);
2161 /* Character lengths of use associated functions may contains references to
2162 symbols not referenced from the current program unit otherwise. Make sure
2163 those symbols are marked as referenced. */
2165 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
2166 && expr->value.function.esym->attr.use_assoc)
2168 gfc_expr_set_symbols_referenced (expr->ts.cl->length);
2172 find_noncopying_intrinsics (expr->value.function.esym,
2173 expr->value.function.actual);
2175 /* Make sure that the expression has a typespec that works. */
2176 if (expr->ts.type == BT_UNKNOWN)
2178 if (expr->symtree->n.sym->result
2179 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN)
2180 expr->ts = expr->symtree->n.sym->result->ts;
2187 /************* Subroutine resolution *************/
2190 pure_subroutine (gfc_code *c, gfc_symbol *sym)
2196 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
2197 sym->name, &c->loc);
2198 else if (gfc_pure (NULL))
2199 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
2205 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
2209 if (sym->attr.generic)
2211 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
2214 c->resolved_sym = s;
2215 pure_subroutine (c, s);
2219 /* TODO: Need to search for elemental references in generic interface. */
2222 if (sym->attr.intrinsic)
2223 return gfc_intrinsic_sub_interface (c, 0);
2230 resolve_generic_s (gfc_code *c)
2235 sym = c->symtree->n.sym;
2239 m = resolve_generic_s0 (c, sym);
2242 else if (m == MATCH_ERROR)
2246 if (sym->ns->parent == NULL)
2248 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2252 if (!generic_sym (sym))
2256 /* Last ditch attempt. See if the reference is to an intrinsic
2257 that possesses a matching interface. 14.1.2.4 */
2258 sym = c->symtree->n.sym;
2260 if (!gfc_intrinsic_name (sym->name, 1))
2262 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
2263 sym->name, &c->loc);
2267 m = gfc_intrinsic_sub_interface (c, 0);
2271 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
2272 "intrinsic subroutine interface", sym->name, &c->loc);
2278 /* Set the name and binding label of the subroutine symbol in the call
2279 expression represented by 'c' to include the type and kind of the
2280 second parameter. This function is for resolving the appropriate
2281 version of c_f_pointer() and c_f_procpointer(). For example, a
2282 call to c_f_pointer() for a default integer pointer could have a
2283 name of c_f_pointer_i4. If no second arg exists, which is an error
2284 for these two functions, it defaults to the generic symbol's name
2285 and binding label. */
2288 set_name_and_label (gfc_code *c, gfc_symbol *sym,
2289 char *name, char *binding_label)
2291 gfc_expr *arg = NULL;
2295 /* The second arg of c_f_pointer and c_f_procpointer determines
2296 the type and kind for the procedure name. */
2297 arg = c->ext.actual->next->expr;
2301 /* Set up the name to have the given symbol's name,
2302 plus the type and kind. */
2303 /* a derived type is marked with the type letter 'u' */
2304 if (arg->ts.type == BT_DERIVED)
2307 kind = 0; /* set the kind as 0 for now */
2311 type = gfc_type_letter (arg->ts.type);
2312 kind = arg->ts.kind;
2315 if (arg->ts.type == BT_CHARACTER)
2316 /* Kind info for character strings not needed. */
2319 sprintf (name, "%s_%c%d", sym->name, type, kind);
2320 /* Set up the binding label as the given symbol's label plus
2321 the type and kind. */
2322 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
2326 /* If the second arg is missing, set the name and label as
2327 was, cause it should at least be found, and the missing
2328 arg error will be caught by compare_parameters(). */
2329 sprintf (name, "%s", sym->name);
2330 sprintf (binding_label, "%s", sym->binding_label);
2337 /* Resolve a generic version of the iso_c_binding procedure given
2338 (sym) to the specific one based on the type and kind of the
2339 argument(s). Currently, this function resolves c_f_pointer() and
2340 c_f_procpointer based on the type and kind of the second argument
2341 (FPTR). Other iso_c_binding procedures aren't specially handled.
2342 Upon successfully exiting, c->resolved_sym will hold the resolved
2343 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
2347 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
2349 gfc_symbol *new_sym;
2350 /* this is fine, since we know the names won't use the max */
2351 char name[GFC_MAX_SYMBOL_LEN + 1];
2352 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2353 /* default to success; will override if find error */
2354 match m = MATCH_YES;
2356 /* Make sure the actual arguments are in the necessary order (based on the
2357 formal args) before resolving. */
2358 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
2360 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
2361 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
2363 set_name_and_label (c, sym, name, binding_label);
2365 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
2367 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
2369 /* Make sure we got a third arg if the second arg has non-zero
2370 rank. We must also check that the type and rank are
2371 correct since we short-circuit this check in
2372 gfc_procedure_use() (called above to sort actual args). */
2373 if (c->ext.actual->next->expr->rank != 0)
2375 if(c->ext.actual->next->next == NULL
2376 || c->ext.actual->next->next->expr == NULL)
2379 gfc_error ("Missing SHAPE parameter for call to %s "
2380 "at %L", sym->name, &(c->loc));
2382 else if (c->ext.actual->next->next->expr->ts.type
2384 || c->ext.actual->next->next->expr->rank != 1)
2387 gfc_error ("SHAPE parameter for call to %s at %L must "
2388 "be a rank 1 INTEGER array", sym->name,
2395 if (m != MATCH_ERROR)
2397 /* the 1 means to add the optional arg to formal list */
2398 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
2400 /* for error reporting, say it's declared where the original was */
2401 new_sym->declared_at = sym->declared_at;
2404 else if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2406 /* TODO: Figure out if this is even reachable; this part of the
2407 conditional may not be necessary. */
2409 if (c->ext.actual->next == NULL)
2411 /* The user did not give two args, so resolve to the version
2412 of c_associated expecting one arg. */
2414 /* get rid of the second arg */
2415 /* TODO!! Should free up the memory here! */
2416 sym->formal->next = NULL;
2424 sprintf (name, "%s_%d", sym->name, num_args);
2425 sprintf (binding_label, "%s_%d", sym->binding_label, num_args);
2426 sym->name = gfc_get_string (name);
2427 strcpy (sym->binding_label, binding_label);
2431 /* no differences for c_loc or c_funloc */
2435 /* set the resolved symbol */
2436 if (m != MATCH_ERROR)
2437 c->resolved_sym = new_sym;
2439 c->resolved_sym = sym;
2445 /* Resolve a subroutine call known to be specific. */
2448 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
2452 if(sym->attr.is_iso_c)
2454 m = gfc_iso_c_sub_interface (c,sym);
2458 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2460 if (sym->attr.dummy)
2462 sym->attr.proc = PROC_DUMMY;
2466 sym->attr.proc = PROC_EXTERNAL;
2470 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
2473 if (sym->attr.intrinsic)
2475 m = gfc_intrinsic_sub_interface (c, 1);
2479 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
2480 "with an intrinsic", sym->name, &c->loc);
2488 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2490 c->resolved_sym = sym;
2491 pure_subroutine (c, sym);
2498 resolve_specific_s (gfc_code *c)
2503 sym = c->symtree->n.sym;
2507 m = resolve_specific_s0 (c, sym);
2510 if (m == MATCH_ERROR)
2513 if (sym->ns->parent == NULL)
2516 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2522 sym = c->symtree->n.sym;
2523 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
2524 sym->name, &c->loc);
2530 /* Resolve a subroutine call not known to be generic nor specific. */
2533 resolve_unknown_s (gfc_code *c)
2537 sym = c->symtree->n.sym;
2539 if (sym->attr.dummy)
2541 sym->attr.proc = PROC_DUMMY;
2545 /* See if we have an intrinsic function reference. */
2547 if (gfc_intrinsic_name (sym->name, 1))
2549 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
2554 /* The reference is to an external name. */
2557 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
2559 c->resolved_sym = sym;
2561 pure_subroutine (c, sym);
2567 /* Resolve a subroutine call. Although it was tempting to use the same code
2568 for functions, subroutines and functions are stored differently and this
2569 makes things awkward. */
2572 resolve_call (gfc_code *c)
2575 procedure_type ptype = PROC_INTRINSIC;
2577 if (c->symtree && c->symtree->n.sym
2578 && c->symtree->n.sym->ts.type != BT_UNKNOWN)
2580 gfc_error ("'%s' at %L has a type, which is not consistent with "
2581 "the CALL at %L", c->symtree->n.sym->name,
2582 &c->symtree->n.sym->declared_at, &c->loc);
2586 /* If external, check for usage. */
2587 if (c->symtree && is_external_proc (c->symtree->n.sym))
2588 resolve_global_procedure (c->symtree->n.sym, &c->loc, 1);
2590 /* Subroutines without the RECURSIVE attribution are not allowed to
2591 * call themselves. */
2592 if (c->symtree && c->symtree->n.sym && !c->symtree->n.sym->attr.recursive)
2594 gfc_symbol *csym, *proc;
2595 csym = c->symtree->n.sym;
2596 proc = gfc_current_ns->proc_name;
2599 gfc_error ("SUBROUTINE '%s' at %L cannot call itself, as it is not "
2600 "RECURSIVE", csym->name, &c->loc);
2604 if (csym->attr.entry && csym->ns->entries && proc->ns->entries
2605 && csym->ns->entries->sym == proc->ns->entries->sym)
2607 gfc_error ("Call to ENTRY '%s' at %L is recursive, but subroutine "
2608 "'%s' is not declared as RECURSIVE",
2609 csym->name, &c->loc, csym->ns->entries->sym->name);
2614 /* Switch off assumed size checking and do this again for certain kinds
2615 of procedure, once the procedure itself is resolved. */
2616 need_full_assumed_size++;
2618 if (c->symtree && c->symtree->n.sym)
2619 ptype = c->symtree->n.sym->attr.proc;
2621 if (resolve_actual_arglist (c->ext.actual, ptype) == FAILURE)
2624 /* Resume assumed_size checking. */
2625 need_full_assumed_size--;
2628 if (c->resolved_sym == NULL)
2629 switch (procedure_kind (c->symtree->n.sym))
2632 t = resolve_generic_s (c);
2635 case PTYPE_SPECIFIC:
2636 t = resolve_specific_s (c);
2640 t = resolve_unknown_s (c);
2644 gfc_internal_error ("resolve_subroutine(): bad function type");
2647 /* Some checks of elemental subroutine actual arguments. */
2648 if (resolve_elemental_actual (NULL, c) == FAILURE)
2652 find_noncopying_intrinsics (c->resolved_sym, c->ext.actual);
2657 /* Compare the shapes of two arrays that have non-NULL shapes. If both
2658 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
2659 match. If both op1->shape and op2->shape are non-NULL return FAILURE
2660 if their shapes do not match. If either op1->shape or op2->shape is
2661 NULL, return SUCCESS. */
2664 compare_shapes (gfc_expr *op1, gfc_expr *op2)
2671 if (op1->shape != NULL && op2->shape != NULL)
2673 for (i = 0; i < op1->rank; i++)
2675 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
2677 gfc_error ("Shapes for operands at %L and %L are not conformable",
2678 &op1->where, &op2->where);
2689 /* Resolve an operator expression node. This can involve replacing the
2690 operation with a user defined function call. */
2693 resolve_operator (gfc_expr *e)
2695 gfc_expr *op1, *op2;
2697 bool dual_locus_error;
2700 /* Resolve all subnodes-- give them types. */
2702 switch (e->value.op.operator)
2705 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
2708 /* Fall through... */
2711 case INTRINSIC_UPLUS:
2712 case INTRINSIC_UMINUS:
2713 case INTRINSIC_PARENTHESES:
2714 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
2719 /* Typecheck the new node. */
2721 op1 = e->value.op.op1;
2722 op2 = e->value.op.op2;
2723 dual_locus_error = false;
2725 if ((op1 && op1->expr_type == EXPR_NULL)
2726 || (op2 && op2->expr_type == EXPR_NULL))
2728 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
2732 switch (e->value.op.operator)
2734 case INTRINSIC_UPLUS:
2735 case INTRINSIC_UMINUS:
2736 if (op1->ts.type == BT_INTEGER
2737 || op1->ts.type == BT_REAL
2738 || op1->ts.type == BT_COMPLEX)
2744 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
2745 gfc_op2string (e->value.op.operator), gfc_typename (&e->ts));
2748 case INTRINSIC_PLUS:
2749 case INTRINSIC_MINUS:
2750 case INTRINSIC_TIMES:
2751 case INTRINSIC_DIVIDE:
2752 case INTRINSIC_POWER:
2753 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
2755 gfc_type_convert_binary (e);
2760 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
2761 gfc_op2string (e->value.op.operator), gfc_typename (&op1->ts),
2762 gfc_typename (&op2->ts));
2765 case INTRINSIC_CONCAT:
2766 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER)
2768 e->ts.type = BT_CHARACTER;
2769 e->ts.kind = op1->ts.kind;
2774 _("Operands of string concatenation operator at %%L are %s/%s"),
2775 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
2781 case INTRINSIC_NEQV:
2782 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
2784 e->ts.type = BT_LOGICAL;
2785 e->ts.kind = gfc_kind_max (op1, op2);
2786 if (op1->ts.kind < e->ts.kind)
2787 gfc_convert_type (op1, &e->ts, 2);
2788 else if (op2->ts.kind < e->ts.kind)
2789 gfc_convert_type (op2, &e->ts, 2);
2793 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
2794 gfc_op2string (e->value.op.operator), gfc_typename (&op1->ts),
2795 gfc_typename (&op2->ts));
2800 if (op1->ts.type == BT_LOGICAL)
2802 e->ts.type = BT_LOGICAL;
2803 e->ts.kind = op1->ts.kind;
2807 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
2808 gfc_typename (&op1->ts));
2812 case INTRINSIC_GT_OS:
2814 case INTRINSIC_GE_OS:
2816 case INTRINSIC_LT_OS:
2818 case INTRINSIC_LE_OS:
2819 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
2821 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
2825 /* Fall through... */
2828 case INTRINSIC_EQ_OS:
2830 case INTRINSIC_NE_OS:
2831 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER)
2833 e->ts.type = BT_LOGICAL;
2834 e->ts.kind = gfc_default_logical_kind;
2838 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
2840 gfc_type_convert_binary (e);
2842 e->ts.type = BT_LOGICAL;
2843 e->ts.kind = gfc_default_logical_kind;
2847 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
2849 _("Logicals at %%L must be compared with %s instead of %s"),
2850 (e->value.op.operator == INTRINSIC_EQ
2851 || e->value.op.operator == INTRINSIC_EQ_OS)
2852 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.operator));
2855 _("Operands of comparison operator '%s' at %%L are %s/%s"),
2856 gfc_op2string (e->value.op.operator), gfc_typename (&op1->ts),
2857 gfc_typename (&op2->ts));
2861 case INTRINSIC_USER:
2862 if (e->value.op.uop->operator == NULL)
2863 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
2864 else if (op2 == NULL)
2865 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
2866 e->value.op.uop->name, gfc_typename (&op1->ts));
2868 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
2869 e->value.op.uop->name, gfc_typename (&op1->ts),
2870 gfc_typename (&op2->ts));
2874 case INTRINSIC_PARENTHESES:
2878 gfc_internal_error ("resolve_operator(): Bad intrinsic");
2881 /* Deal with arrayness of an operand through an operator. */
2885 switch (e->value.op.operator)
2887 case INTRINSIC_PLUS:
2888 case INTRINSIC_MINUS:
2889 case INTRINSIC_TIMES:
2890 case INTRINSIC_DIVIDE:
2891 case INTRINSIC_POWER:
2892 case INTRINSIC_CONCAT:
2896 case INTRINSIC_NEQV:
2898 case INTRINSIC_EQ_OS:
2900 case INTRINSIC_NE_OS:
2902 case INTRINSIC_GT_OS:
2904 case INTRINSIC_GE_OS:
2906 case INTRINSIC_LT_OS:
2908 case INTRINSIC_LE_OS:
2910 if (op1->rank == 0 && op2->rank == 0)
2913 if (op1->rank == 0 && op2->rank != 0)
2915 e->rank = op2->rank;
2917 if (e->shape == NULL)
2918 e->shape = gfc_copy_shape (op2->shape, op2->rank);
2921 if (op1->rank != 0 && op2->rank == 0)
2923 e->rank = op1->rank;
2925 if (e->shape == NULL)
2926 e->shape = gfc_copy_shape (op1->shape, op1->rank);
2929 if (op1->rank != 0 && op2->rank != 0)
2931 if (op1->rank == op2->rank)
2933 e->rank = op1->rank;
2934 if (e->shape == NULL)
2936 t = compare_shapes(op1, op2);
2940 e->shape = gfc_copy_shape (op1->shape, op1->rank);
2945 /* Allow higher level expressions to work. */
2948 /* Try user-defined operators, and otherwise throw an error. */
2949 dual_locus_error = true;
2951 _("Inconsistent ranks for operator at %%L and %%L"));
2958 case INTRINSIC_PARENTHESES:
2960 /* This is always correct and sometimes necessary! */
2961 if (e->ts.type == BT_UNKNOWN)
2964 if (e->ts.type == BT_CHARACTER && !e->ts.cl)
2965 e->ts.cl = op1->ts.cl;
2968 case INTRINSIC_UPLUS:
2969 case INTRINSIC_UMINUS:
2970 /* Simply copy arrayness attribute */
2971 e->rank = op1->rank;
2973 if (e->shape == NULL)
2974 e->shape = gfc_copy_shape (op1->shape, op1->rank);
2982 /* Attempt to simplify the expression. */
2985 t = gfc_simplify_expr (e, 0);
2986 /* Some calls do not succeed in simplification and return FAILURE
2987 even though there is no error; eg. variable references to
2988 PARAMETER arrays. */
2989 if (!gfc_is_constant_expr (e))
2996 if (gfc_extend_expr (e) == SUCCESS)
2999 if (dual_locus_error)
3000 gfc_error (msg, &op1->where, &op2->where);
3002 gfc_error (msg, &e->where);
3008 /************** Array resolution subroutines **************/
3011 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
3014 /* Compare two integer expressions. */
3017 compare_bound (gfc_expr *a, gfc_expr *b)
3021 if (a == NULL || a->expr_type != EXPR_CONSTANT
3022 || b == NULL || b->expr_type != EXPR_CONSTANT)
3025 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
3026 gfc_internal_error ("compare_bound(): Bad expression");
3028 i = mpz_cmp (a->value.integer, b->value.integer);
3038 /* Compare an integer expression with an integer. */
3041 compare_bound_int (gfc_expr *a, int b)
3045 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3048 if (a->ts.type != BT_INTEGER)
3049 gfc_internal_error ("compare_bound_int(): Bad expression");
3051 i = mpz_cmp_si (a->value.integer, b);
3061 /* Compare an integer expression with a mpz_t. */
3064 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
3068 if (a == NULL || a->expr_type != EXPR_CONSTANT)
3071 if (a->ts.type != BT_INTEGER)
3072 gfc_internal_error ("compare_bound_int(): Bad expression");
3074 i = mpz_cmp (a->value.integer, b);
3084 /* Compute the last value of a sequence given by a triplet.
3085 Return 0 if it wasn't able to compute the last value, or if the
3086 sequence if empty, and 1 otherwise. */
3089 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
3090 gfc_expr *stride, mpz_t last)
3094 if (start == NULL || start->expr_type != EXPR_CONSTANT
3095 || end == NULL || end->expr_type != EXPR_CONSTANT
3096 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
3099 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
3100 || (stride != NULL && stride->ts.type != BT_INTEGER))
3103 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
3105 if (compare_bound (start, end) == CMP_GT)
3107 mpz_set (last, end->value.integer);
3111 if (compare_bound_int (stride, 0) == CMP_GT)
3113 /* Stride is positive */
3114 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
3119 /* Stride is negative */
3120 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
3125 mpz_sub (rem, end->value.integer, start->value.integer);
3126 mpz_tdiv_r (rem, rem, stride->value.integer);
3127 mpz_sub (last, end->value.integer, rem);
3134 /* Compare a single dimension of an array reference to the array
3138 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
3142 /* Given start, end and stride values, calculate the minimum and
3143 maximum referenced indexes. */
3151 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
3153 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
3160 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
3161 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
3163 comparison comp_start_end = compare_bound (AR_START, AR_END);
3165 /* Check for zero stride, which is not allowed. */
3166 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
3168 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
3172 /* if start == len || (stride > 0 && start < len)
3173 || (stride < 0 && start > len),
3174 then the array section contains at least one element. In this
3175 case, there is an out-of-bounds access if
3176 (start < lower || start > upper). */
3177 if (compare_bound (AR_START, AR_END) == CMP_EQ
3178 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
3179 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
3180 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
3181 && comp_start_end == CMP_GT))
3183 if (compare_bound (AR_START, as->lower[i]) == CMP_LT
3184 || compare_bound (AR_START, as->upper[i]) == CMP_GT)
3188 /* If we can compute the highest index of the array section,
3189 then it also has to be between lower and upper. */
3190 mpz_init (last_value);
3191 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
3194 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT
3195 || compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
3197 mpz_clear (last_value);
3201 mpz_clear (last_value);
3209 gfc_internal_error ("check_dimension(): Bad array reference");
3215 gfc_warning ("Array reference at %L is out of bounds", &ar->c_where[i]);
3220 /* Compare an array reference with an array specification. */
3223 compare_spec_to_ref (gfc_array_ref *ar)
3230 /* TODO: Full array sections are only allowed as actual parameters. */
3231 if (as->type == AS_ASSUMED_SIZE
3232 && (/*ar->type == AR_FULL
3233 ||*/ (ar->type == AR_SECTION
3234 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
3236 gfc_error ("Rightmost upper bound of assumed size array section "
3237 "not specified at %L", &ar->where);
3241 if (ar->type == AR_FULL)
3244 if (as->rank != ar->dimen)
3246 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
3247 &ar->where, ar->dimen, as->rank);
3251 for (i = 0; i < as->rank; i++)
3252 if (check_dimension (i, ar, as) == FAILURE)
3259 /* Resolve one part of an array index. */
3262 gfc_resolve_index (gfc_expr *index, int check_scalar)
3269 if (gfc_resolve_expr (index) == FAILURE)
3272 if (check_scalar && index->rank != 0)
3274 gfc_error ("Array index at %L must be scalar", &index->where);
3278 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
3280 gfc_error ("Array index at %L must be of INTEGER type",
3285 if (index->ts.type == BT_REAL)
3286 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
3287 &index->where) == FAILURE)
3290 if (index->ts.kind != gfc_index_integer_kind
3291 || index->ts.type != BT_INTEGER)
3294 ts.type = BT_INTEGER;
3295 ts.kind = gfc_index_integer_kind;
3297 gfc_convert_type_warn (index, &ts, 2, 0);
3303 /* Resolve a dim argument to an intrinsic function. */
3306 gfc_resolve_dim_arg (gfc_expr *dim)
3311 if (gfc_resolve_expr (dim) == FAILURE)
3316 gfc_error ("Argument dim at %L must be scalar", &dim->where);
3320 if (dim->ts.type != BT_INTEGER)
3322 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
3325 if (dim->ts.kind != gfc_index_integer_kind)
3329 ts.type = BT_INTEGER;
3330 ts.kind = gfc_index_integer_kind;
3332 gfc_convert_type_warn (dim, &ts, 2, 0);
3338 /* Given an expression that contains array references, update those array
3339 references to point to the right array specifications. While this is
3340 filled in during matching, this information is difficult to save and load
3341 in a module, so we take care of it here.
3343 The idea here is that the original array reference comes from the
3344 base symbol. We traverse the list of reference structures, setting
3345 the stored reference to references. Component references can
3346 provide an additional array specification. */
3349 find_array_spec (gfc_expr *e)
3353 gfc_symbol *derived;
3356 as = e->symtree->n.sym->as;
3359 for (ref = e->ref; ref; ref = ref->next)
3364 gfc_internal_error ("find_array_spec(): Missing spec");
3371 if (derived == NULL)
3372 derived = e->symtree->n.sym->ts.derived;
3374 c = derived->components;
3376 for (; c; c = c->next)
3377 if (c == ref->u.c.component)
3379 /* Track the sequence of component references. */
3380 if (c->ts.type == BT_DERIVED)
3381 derived = c->ts.derived;
3386 gfc_internal_error ("find_array_spec(): Component not found");
3391 gfc_internal_error ("find_array_spec(): unused as(1)");
3402 gfc_internal_error ("find_array_spec(): unused as(2)");
3406 /* Resolve an array reference. */
3409 resolve_array_ref (gfc_array_ref *ar)
3411 int i, check_scalar;
3414 for (i = 0; i < ar->dimen; i++)
3416 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
3418 if (gfc_resolve_index (ar->start[i], check_scalar) == FAILURE)
3420 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
3422 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
3427 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
3431 ar->dimen_type[i] = DIMEN_ELEMENT;
3435 ar->dimen_type[i] = DIMEN_VECTOR;
3436 if (e->expr_type == EXPR_VARIABLE
3437 && e->symtree->n.sym->ts.type == BT_DERIVED)
3438 ar->start[i] = gfc_get_parentheses (e);
3442 gfc_error ("Array index at %L is an array of rank %d",
3443 &ar->c_where[i], e->rank);
3448 /* If the reference type is unknown, figure out what kind it is. */
3450 if (ar->type == AR_UNKNOWN)
3452 ar->type = AR_ELEMENT;
3453 for (i = 0; i < ar->dimen; i++)
3454 if (ar->dimen_type[i] == DIMEN_RANGE
3455 || ar->dimen_type[i] == DIMEN_VECTOR)
3457 ar->type = AR_SECTION;
3462 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
3470 resolve_substring (gfc_ref *ref)
3472 if (ref->u.ss.start != NULL)
3474 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
3477 if (ref->u.ss.start->ts.type != BT_INTEGER)
3479 gfc_error ("Substring start index at %L must be of type INTEGER",
3480 &ref->u.ss.start->where);
3484 if (ref->u.ss.start->rank != 0)
3486 gfc_error ("Substring start index at %L must be scalar",
3487 &ref->u.ss.start->where);
3491 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
3492 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3493 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3495 gfc_error ("Substring start index at %L is less than one",
3496 &ref->u.ss.start->where);
3501 if (ref->u.ss.end != NULL)
3503 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
3506 if (ref->u.ss.end->ts.type != BT_INTEGER)
3508 gfc_error ("Substring end index at %L must be of type INTEGER",
3509 &ref->u.ss.end->where);
3513 if (ref->u.ss.end->rank != 0)
3515 gfc_error ("Substring end index at %L must be scalar",
3516 &ref->u.ss.end->where);
3520 if (ref->u.ss.length != NULL
3521 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
3522 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
3523 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
3525 gfc_error ("Substring end index at %L exceeds the string length",
3526 &ref->u.ss.start->where);
3535 /* This function supplies missing substring charlens. */
3538 gfc_resolve_substring_charlen (gfc_expr *e)
3541 gfc_expr *start, *end;
3543 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
3544 if (char_ref->type == REF_SUBSTRING)
3550 gcc_assert (char_ref->next == NULL);
3554 if (e->ts.cl->length)
3555 gfc_free_expr (e->ts.cl->length);
3556 else if (e->expr_type == EXPR_VARIABLE
3557 && e->symtree->n.sym->attr.dummy)
3561 e->ts.type = BT_CHARACTER;
3562 e->ts.kind = gfc_default_character_kind;
3566 e->ts.cl = gfc_get_charlen ();
3567 e->ts.cl->next = gfc_current_ns->cl_list;
3568 gfc_current_ns->cl_list = e->ts.cl;
3571 if (char_ref->u.ss.start)
3572 start = gfc_copy_expr (char_ref->u.ss.start);
3574 start = gfc_int_expr (1);
3576 if (char_ref->u.ss.end)
3577 end = gfc_copy_expr (char_ref->u.ss.end);
3578 else if (e->expr_type == EXPR_VARIABLE)
3579 end = gfc_copy_expr (e->symtree->n.sym->ts.cl->length);
3586 /* Length = (end - start +1). */
3587 e->ts.cl->length = gfc_subtract (end, start);
3588 e->ts.cl->length = gfc_add (e->ts.cl->length, gfc_int_expr (1));
3590 e->ts.cl->length->ts.type = BT_INTEGER;
3591 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;;
3593 /* Make sure that the length is simplified. */
3594 gfc_simplify_expr (e->ts.cl->length, 1);
3595 gfc_resolve_expr (e->ts.cl->length);
3599 /* Resolve subtype references. */
3602 resolve_ref (gfc_expr *expr)
3604 int current_part_dimension, n_components, seen_part_dimension;
3607 for (ref = expr->ref; ref; ref = ref->next)
3608 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
3610 find_array_spec (expr);
3614 for (ref = expr->ref; ref; ref = ref->next)
3618 if (resolve_array_ref (&ref->u.ar) == FAILURE)
3626 resolve_substring (ref);
3630 /* Check constraints on part references. */
3632 current_part_dimension = 0;
3633 seen_part_dimension = 0;
3636 for (ref = expr->ref; ref; ref = ref->next)
3641 switch (ref->u.ar.type)
3645 current_part_dimension = 1;
3649 current_part_dimension = 0;
3653 gfc_internal_error ("resolve_ref(): Bad array reference");
3659 if (current_part_dimension || seen_part_dimension)
3661 if (ref->u.c.component->pointer)
3663 gfc_error ("Component to the right of a part reference "
3664 "with nonzero rank must not have the POINTER "
3665 "attribute at %L", &expr->where);
3668 else if (ref->u.c.component->allocatable)
3670 gfc_error ("Component to the right of a part reference "
3671 "with nonzero rank must not have the ALLOCATABLE "
3672 "attribute at %L", &expr->where);
3684 if (((ref->type == REF_COMPONENT && n_components > 1)
3685 || ref->next == NULL)
3686 && current_part_dimension
3687 && seen_part_dimension)
3689 gfc_error ("Two or more part references with nonzero rank must "
3690 "not be specified at %L", &expr->where);
3694 if (ref->type == REF_COMPONENT)
3696 if (current_part_dimension)
3697 seen_part_dimension = 1;
3699 /* reset to make sure */
3700 current_part_dimension = 0;
3708 /* Given an expression, determine its shape. This is easier than it sounds.
3709 Leaves the shape array NULL if it is not possible to determine the shape. */
3712 expression_shape (gfc_expr *e)
3714 mpz_t array[GFC_MAX_DIMENSIONS];
3717 if (e->rank == 0 || e->shape != NULL)
3720 for (i = 0; i < e->rank; i++)
3721 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
3724 e->shape = gfc_get_shape (e->rank);
3726 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
3731 for (i--; i >= 0; i--)
3732 mpz_clear (array[i]);
3736 /* Given a variable expression node, compute the rank of the expression by
3737 examining the base symbol and any reference structures it may have. */
3740 expression_rank (gfc_expr *e)
3747 if (e->expr_type == EXPR_ARRAY)
3749 /* Constructors can have a rank different from one via RESHAPE(). */
3751 if (e->symtree == NULL)
3757 e->rank = (e->symtree->n.sym->as == NULL)
3758 ? 0 : e->symtree->n.sym->as->rank;
3764 for (ref = e->ref; ref; ref = ref->next)
3766 if (ref->type != REF_ARRAY)
3769 if (ref->u.ar.type == AR_FULL)
3771 rank = ref->u.ar.as->rank;
3775 if (ref->u.ar.type == AR_SECTION)
3777 /* Figure out the rank of the section. */
3779 gfc_internal_error ("expression_rank(): Two array specs");
3781 for (i = 0; i < ref->u.ar.dimen; i++)
3782 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
3783 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
3793 expression_shape (e);
3797 /* Resolve a variable expression. */
3800 resolve_variable (gfc_expr *e)
3807 if (e->symtree == NULL)
3810 if (e->ref && resolve_ref (e) == FAILURE)
3813 sym = e->symtree->n.sym;
3814 if (sym->attr.flavor == FL_PROCEDURE && !sym->attr.function)
3816 e->ts.type = BT_PROCEDURE;
3820 if (sym->ts.type != BT_UNKNOWN)
3821 gfc_variable_attr (e, &e->ts);
3824 /* Must be a simple variable reference. */
3825 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
3830 if (check_assumed_size_reference (sym, e))
3833 /* Deal with forward references to entries during resolve_code, to
3834 satisfy, at least partially, 12.5.2.5. */
3835 if (gfc_current_ns->entries
3836 && current_entry_id == sym->entry_id
3839 && cs_base->current->op != EXEC_ENTRY)
3841 gfc_entry_list *entry;
3842 gfc_formal_arglist *formal;
3846 /* If the symbol is a dummy... */
3847 if (sym->attr.dummy)
3849 entry = gfc_current_ns->entries;
3852 /* ...test if the symbol is a parameter of previous entries. */
3853 for (; entry && entry->id <= current_entry_id; entry = entry->next)
3854 for (formal = entry->sym->formal; formal; formal = formal->next)
3856 if (formal->sym && sym->name == formal->sym->name)
3860 /* If it has not been seen as a dummy, this is an error. */
3863 if (specification_expr)
3864 gfc_error ("Variable '%s',used in a specification expression, "
3865 "is referenced at %L before the ENTRY statement "
3866 "in which it is a parameter",
3867 sym->name, &cs_base->current->loc);
3869 gfc_error ("Variable '%s' is used at %L before the ENTRY "
3870 "statement in which it is a parameter",
3871 sym->name, &cs_base->current->loc);
3876 /* Now do the same check on the specification expressions. */
3877 specification_expr = 1;
3878 if (sym->ts.type == BT_CHARACTER
3879 && gfc_resolve_expr (sym->ts.cl->length) == FAILURE)
3883 for (n = 0; n < sym->as->rank; n++)
3885 specification_expr = 1;
3886 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
3888 specification_expr = 1;
3889 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
3892 specification_expr = 0;
3895 /* Update the symbol's entry level. */
3896 sym->entry_id = current_entry_id + 1;
3903 /* Checks to see that the correct symbol has been host associated.
3904 The only situation where this arises is that in which a twice
3905 contained function is parsed after the host association is made.
3906 Therefore, on detecting this, the line is rematched, having got
3907 rid of the existing references and actual_arg_list. */
3909 check_host_association (gfc_expr *e)
3911 gfc_symbol *sym, *old_sym;
3915 bool retval = e->expr_type == EXPR_FUNCTION;
3917 if (e->symtree == NULL || e->symtree->n.sym == NULL)
3920 old_sym = e->symtree->n.sym;
3922 if (old_sym->attr.use_assoc)
3925 if (gfc_current_ns->parent
3926 && gfc_current_ns->parent->parent
3927 && old_sym->ns != gfc_current_ns)
3929 gfc_find_symbol (old_sym->name, gfc_current_ns->parent, 1, &sym);
3930 if (sym && old_sym != sym && sym->attr.flavor == FL_PROCEDURE)
3932 temp_locus = gfc_current_locus;
3933 gfc_current_locus = e->where;
3935 gfc_buffer_error (1);
3937 gfc_free_ref_list (e->ref);
3942 gfc_free_actual_arglist (e->value.function.actual);
3943 e->value.function.actual = NULL;
3946 if (e->shape != NULL)
3948 for (n = 0; n < e->rank; n++)
3949 mpz_clear (e->shape[n]);
3951 gfc_free (e->shape);
3954 gfc_match_rvalue (&expr);
3956 gfc_buffer_error (0);
3958 gcc_assert (expr && sym == expr->symtree->n.sym);
3964 gfc_current_locus = temp_locus;
3967 /* This might have changed! */
3968 return e->expr_type == EXPR_FUNCTION;
3973 gfc_resolve_character_operator (gfc_expr *e)
3975 gfc_expr *op1 = e->value.op.op1;
3976 gfc_expr *op2 = e->value.op.op2;
3977 gfc_expr *e1 = NULL;
3978 gfc_expr *e2 = NULL;
3980 gcc_assert (e->value.op.operator == INTRINSIC_CONCAT);
3982 if (op1->ts.cl && op1->ts.cl->length)
3983 e1 = gfc_copy_expr (op1->ts.cl->length);
3984 else if (op1->expr_type == EXPR_CONSTANT)
3985 e1 = gfc_int_expr (op1->value.character.length);
3987 if (op2->ts.cl && op2->ts.cl->length)
3988 e2 = gfc_copy_expr (op2->ts.cl->length);
3989 else if (op2->expr_type == EXPR_CONSTANT)
3990 e2 = gfc_int_expr (op2->value.character.length);
3992 e->ts.cl = gfc_get_charlen ();
3993 e->ts.cl->next = gfc_current_ns->cl_list;
3994 gfc_current_ns->cl_list = e->ts.cl;
3999 e->ts.cl->length = gfc_add (e1, e2);
4000 e->ts.cl->length->ts.type = BT_INTEGER;
4001 e->ts.cl->length->ts.kind = gfc_charlen_int_kind;;
4002 gfc_simplify_expr (e->ts.cl->length, 0);
4003 gfc_resolve_expr (e->ts.cl->length);
4009 /* Ensure that an character expression has a charlen and, if possible, a
4010 length expression. */
4013 fixup_charlen (gfc_expr *e)
4015 /* The cases fall through so that changes in expression type and the need
4016 for multiple fixes are picked up. In all circumstances, a charlen should
4017 be available for the middle end to hang a backend_decl on. */
4018 switch (e->expr_type)
4021 gfc_resolve_character_operator (e);
4024 if (e->expr_type == EXPR_ARRAY)
4025 gfc_resolve_character_array_constructor (e);
4027 case EXPR_SUBSTRING:
4028 if (!e->ts.cl && e->ref)
4029 gfc_resolve_substring_charlen (e);
4034 e->ts.cl = gfc_get_charlen ();
4035 e->ts.cl->next = gfc_current_ns->cl_list;
4036 gfc_current_ns->cl_list = e->ts.cl;
4044 /* Resolve an expression. That is, make sure that types of operands agree
4045 with their operators, intrinsic operators are converted to function calls
4046 for overloaded types and unresolved function references are resolved. */
4049 gfc_resolve_expr (gfc_expr *e)
4056 switch (e->expr_type)
4059 t = resolve_operator (e);
4065 if (check_host_association (e))
4066 t = resolve_function (e);
4069 t = resolve_variable (e);
4071 expression_rank (e);
4074 if (e->ts.type == BT_CHARACTER && e->ts.cl == NULL && e->ref
4075 && e->ref->type != REF_SUBSTRING)
4076 gfc_resolve_substring_charlen (e);
4080 case EXPR_SUBSTRING:
4081 t = resolve_ref (e);
4091 if (resolve_ref (e) == FAILURE)
4094 t = gfc_resolve_array_constructor (e);
4095 /* Also try to expand a constructor. */
4098 expression_rank (e);
4099 gfc_expand_constructor (e);
4102 /* This provides the opportunity for the length of constructors with
4103 character valued function elements to propagate the string length
4104 to the expression. */
4105 if (e->ts.type == BT_CHARACTER)
4106 gfc_resolve_character_array_constructor (e);
4110 case EXPR_STRUCTURE:
4111 t = resolve_ref (e);
4115 t = resolve_structure_cons (e);
4119 t = gfc_simplify_expr (e, 0);
4123 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
4126 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.cl)
4133 /* Resolve an expression from an iterator. They must be scalar and have
4134 INTEGER or (optionally) REAL type. */
4137 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
4138 const char *name_msgid)
4140 if (gfc_resolve_expr (expr) == FAILURE)
4143 if (expr->rank != 0)
4145 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
4149 if (expr->ts.type != BT_INTEGER)
4151 if (expr->ts.type == BT_REAL)
4154 return gfc_notify_std (GFC_STD_F95_DEL,
4155 "Deleted feature: %s at %L must be integer",
4156 _(name_msgid), &expr->where);
4159 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
4166 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
4174 /* Resolve the expressions in an iterator structure. If REAL_OK is
4175 false allow only INTEGER type iterators, otherwise allow REAL types. */
4178 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
4180 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
4184 if (gfc_pure (NULL) && gfc_impure_variable (iter->var->symtree->n.sym))
4186 gfc_error ("Cannot assign to loop variable in PURE procedure at %L",
4191 if (gfc_resolve_iterator_expr (iter->start, real_ok,
4192 "Start expression in DO loop") == FAILURE)
4195 if (gfc_resolve_iterator_expr (iter->end, real_ok,
4196 "End expression in DO loop") == FAILURE)
4199 if (gfc_resolve_iterator_expr (iter->step, real_ok,
4200 "Step expression in DO loop") == FAILURE)
4203 if (iter->step->expr_type == EXPR_CONSTANT)
4205 if ((iter->step->ts.type == BT_INTEGER
4206 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
4207 || (iter->step->ts.type == BT_REAL
4208 && mpfr_sgn (iter->step->value.real) == 0))
4210 gfc_error ("Step expression in DO loop at %L cannot be zero",
4211 &iter->step->where);
4216 /* Convert start, end, and step to the same type as var. */
4217 if (iter->start->ts.kind != iter->var->ts.kind
4218 || iter->start->ts.type != iter->var->ts.type)
4219 gfc_convert_type (iter->start, &iter->var->ts, 2);
4221 if (iter->end->ts.kind != iter->var->ts.kind
4222 || iter->end->ts.type != iter->var->ts.type)
4223 gfc_convert_type (iter->end, &iter->var->ts, 2);
4225 if (iter->step->ts.kind != iter->var->ts.kind
4226 || iter->step->ts.type != iter->var->ts.type)
4227 gfc_convert_type (iter->step, &iter->var->ts, 2);
4233 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
4234 to be a scalar INTEGER variable. The subscripts and stride are scalar
4235 INTEGERs, and if stride is a constant it must be nonzero. */
4238 resolve_forall_iterators (gfc_forall_iterator *iter)
4242 if (gfc_resolve_expr (iter->var) == SUCCESS
4243 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
4244 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
4247 if (gfc_resolve_expr (iter->start) == SUCCESS
4248 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
4249 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
4250 &iter->start->where);
4251 if (iter->var->ts.kind != iter->start->ts.kind)
4252 gfc_convert_type (iter->start, &iter->var->ts, 2);
4254 if (gfc_resolve_expr (iter->end) == SUCCESS
4255 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
4256 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
4258 if (iter->var->ts.kind != iter->end->ts.kind)
4259 gfc_convert_type (iter->end, &iter->var->ts, 2);
4261 if (gfc_resolve_expr (iter->stride) == SUCCESS)
4263 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
4264 gfc_error ("FORALL stride expression at %L must be a scalar %s",
4265 &iter->stride->where, "INTEGER");
4267 if (iter->stride->expr_type == EXPR_CONSTANT
4268 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
4269 gfc_error ("FORALL stride expression at %L cannot be zero",
4270 &iter->stride->where);
4272 if (iter->var->ts.kind != iter->stride->ts.kind)
4273 gfc_convert_type (iter->stride, &iter->var->ts, 2);
4280 /* Given a pointer to a symbol that is a derived type, see if it's
4281 inaccessible, i.e. if it's defined in another module and the components are
4282 PRIVATE. The search is recursive if necessary. Returns zero if no
4283 inaccessible components are found, nonzero otherwise. */
4286 derived_inaccessible (gfc_symbol *sym)
4290 if (sym->attr.use_assoc && sym->attr.private_comp)
4293 for (c = sym->components; c; c = c->next)
4295 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.derived))
4303 /* Resolve the argument of a deallocate expression. The expression must be
4304 a pointer or a full array. */
4307 resolve_deallocate_expr (gfc_expr *e)
4309 symbol_attribute attr;
4310 int allocatable, pointer, check_intent_in;
4313 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
4314 check_intent_in = 1;
4316 if (gfc_resolve_expr (e) == FAILURE)
4319 if (e->expr_type != EXPR_VARIABLE)
4322 allocatable = e->symtree->n.sym->attr.allocatable;
4323 pointer = e->symtree->n.sym->attr.pointer;
4324 for (ref = e->ref; ref; ref = ref->next)
4327 check_intent_in = 0;
4332 if (ref->u.ar.type != AR_FULL)
4337 allocatable = (ref->u.c.component->as != NULL
4338 && ref->u.c.component->as->type == AS_DEFERRED);
4339 pointer = ref->u.c.component->pointer;
4348 attr = gfc_expr_attr (e);
4350 if (allocatable == 0 && attr.pointer == 0)
4353 gfc_error ("Expression in DEALLOCATE statement at %L must be "
4354 "ALLOCATABLE or a POINTER", &e->where);
4358 && e->symtree->n.sym->attr.intent == INTENT_IN)
4360 gfc_error ("Cannot deallocate INTENT(IN) variable '%s' at %L",
4361 e->symtree->n.sym->name, &e->where);
4369 /* Returns true if the expression e contains a reference the symbol sym. */
4371 find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
4373 gfc_actual_arglist *arg;
4381 switch (e->expr_type)
4384 for (arg = e->value.function.actual; arg; arg = arg->next)
4385 rv = rv || find_sym_in_expr (sym, arg->expr);
4388 /* If the variable is not the same as the dependent, 'sym', and
4389 it is not marked as being declared and it is in the same
4390 namespace as 'sym', add it to the local declarations. */
4392 if (sym == e->symtree->n.sym)
4397 rv = rv || find_sym_in_expr (sym, e->value.op.op1);
4398 rv = rv || find_sym_in_expr (sym, e->value.op.op2);
4407 for (ref = e->ref; ref; ref = ref->next)
4412 for (i = 0; i < ref->u.ar.dimen; i++)
4414 rv = rv || find_sym_in_expr (sym, ref->u.ar.start[i]);
4415 rv = rv || find_sym_in_expr (sym, ref->u.ar.end[i]);
4416 rv = rv || find_sym_in_expr (sym, ref->u.ar.stride[i]);
4421 rv = rv || find_sym_in_expr (sym, ref->u.ss.start);
4422 rv = rv || find_sym_in_expr (sym, ref->u.ss.end);
4426 if (ref->u.c.component->ts.type == BT_CHARACTER
4427 && ref->u.c.component->ts.cl->length->expr_type
4430 || find_sym_in_expr (sym,
4431 ref->u.c.component->ts.cl->length);
4433 if (ref->u.c.component->as)
4434 for (i = 0; i < ref->u.c.component->as->rank; i++)
4437 || find_sym_in_expr (sym,
4438 ref->u.c.component->as->lower[i]);
4440 || find_sym_in_expr (sym,
4441 ref->u.c.component->as->upper[i]);
4451 /* Given the expression node e for an allocatable/pointer of derived type to be
4452 allocated, get the expression node to be initialized afterwards (needed for
4453 derived types with default initializers, and derived types with allocatable
4454 components that need nullification.) */
4457 expr_to_initialize (gfc_expr *e)
4463 result = gfc_copy_expr (e);
4465 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
4466 for (ref = result->ref; ref; ref = ref->next)
4467 if (ref->type == REF_ARRAY && ref->next == NULL)
4469 ref->u.ar.type = AR_FULL;
4471 for (i = 0; i < ref->u.ar.dimen; i++)
4472 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
4474 result->rank = ref->u.ar.dimen;
4482 /* Resolve the expression in an ALLOCATE statement, doing the additional
4483 checks to see whether the expression is OK or not. The expression must
4484 have a trailing array reference that gives the size of the array. */
4487 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
4489 int i, pointer, allocatable, dimension, check_intent_in;
4490 symbol_attribute attr;
4491 gfc_ref *ref, *ref2;
4498 /* Check INTENT(IN), unless the object is a sub-component of a pointer. */
4499 check_intent_in = 1;
4501 if (gfc_resolve_expr (e) == FAILURE)
4504 if (code->expr && code->expr->expr_type == EXPR_VARIABLE)
4505 sym = code->expr->symtree->n.sym;
4509 /* Make sure the expression is allocatable or a pointer. If it is
4510 pointer, the next-to-last reference must be a pointer. */
4514 if (e->expr_type != EXPR_VARIABLE)
4517 attr = gfc_expr_attr (e);
4518 pointer = attr.pointer;
4519 dimension = attr.dimension;
4523 allocatable = e->symtree->n.sym->attr.allocatable;
4524 pointer = e->symtree->n.sym->attr.pointer;
4525 dimension = e->symtree->n.sym->attr.dimension;
4527 if (sym == e->symtree->n.sym && sym->ts.type != BT_DERIVED)
4529 gfc_error ("The STAT variable '%s' in an ALLOCATE statement must "
4530 "not be allocated in the same statement at %L",
4531 sym->name, &e->where);
4535 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
4538 check_intent_in = 0;
4543 if (ref->next != NULL)
4548 allocatable = (ref->u.c.component->as != NULL
4549 && ref->u.c.component->as->type == AS_DEFERRED);
4551 pointer = ref->u.c.component->pointer;
4552 dimension = ref->u.c.component->dimension;
4563 if (allocatable == 0 && pointer == 0)
4565 gfc_error ("Expression in ALLOCATE statement at %L must be "
4566 "ALLOCATABLE or a POINTER", &e->where);
4571 && e->symtree->n.sym->attr.intent == INTENT_IN)
4573 gfc_error ("Cannot allocate INTENT(IN) variable '%s' at %L",
4574 e->symtree->n.sym->name, &e->where);
4578 /* Add default initializer for those derived types that need them. */
4579 if (e->ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&e->ts)))
4581 init_st = gfc_get_code ();
4582 init_st->loc = code->loc;
4583 init_st->op = EXEC_INIT_ASSIGN;
4584 init_st->expr = expr_to_initialize (e);
4585 init_st->expr2 = init_e;
4586 init_st->next = code->next;
4587 code->next = init_st;
4590 if (pointer && dimension == 0)
4593 /* Make sure the next-to-last reference node is an array specification. */
4595 if (ref2 == NULL || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL)
4597 gfc_error ("Array specification required in ALLOCATE statement "
4598 "at %L", &e->where);
4602 /* Make sure that the array section reference makes sense in the
4603 context of an ALLOCATE specification. */
4607 for (i = 0; i < ar->dimen; i++)
4609 if (ref2->u.ar.type == AR_ELEMENT)
4612 switch (ar->dimen_type[i])
4618 if (ar->start[i] != NULL
4619 && ar->end[i] != NULL
4620 && ar->stride[i] == NULL)
4623 /* Fall Through... */
4627 gfc_error ("Bad array specification in ALLOCATE statement at %L",
4634 for (a = code->ext.alloc_list; a; a = a->next)
4636 sym = a->expr->symtree->n.sym;
4638 /* TODO - check derived type components. */
4639 if (sym->ts.type == BT_DERIVED)
4642 if ((ar->start[i] != NULL && find_sym_in_expr (sym, ar->start[i]))
4643 || (ar->end[i] != NULL && find_sym_in_expr (sym, ar->end[i])))
4645 gfc_error ("'%s' must not appear an the array specification at "
4646 "%L in the same ALLOCATE statement where it is "
4647 "itself allocated", sym->name, &ar->where);
4657 /************ SELECT CASE resolution subroutines ************/
4659 /* Callback function for our mergesort variant. Determines interval
4660 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
4661 op1 > op2. Assumes we're not dealing with the default case.
4662 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
4663 There are nine situations to check. */
4666 compare_cases (const gfc_case *op1, const gfc_case *op2)
4670 if (op1->low == NULL) /* op1 = (:L) */
4672 /* op2 = (:N), so overlap. */
4674 /* op2 = (M:) or (M:N), L < M */
4675 if (op2->low != NULL
4676 && gfc_compare_expr (op1->high, op2->low) < 0)
4679 else if (op1->high == NULL) /* op1 = (K:) */
4681 /* op2 = (M:), so overlap. */
4683 /* op2 = (:N) or (M:N), K > N */
4684 if (op2->high != NULL
4685 && gfc_compare_expr (op1->low, op2->high) > 0)
4688 else /* op1 = (K:L) */
4690 if (op2->low == NULL) /* op2 = (:N), K > N */
4691 retval = (gfc_compare_expr (op1->low, op2->high) > 0) ? 1 : 0;
4692 else if (op2->high == NULL) /* op2 = (M:), L < M */
4693 retval = (gfc_compare_expr (op1->high, op2->low) < 0) ? -1 : 0;
4694 else /* op2 = (M:N) */
4698 if (gfc_compare_expr (op1->high, op2->low) < 0)
4701 else if (gfc_compare_expr (op1->low, op2->high) > 0)
4710 /* Merge-sort a double linked case list, detecting overlap in the
4711 process. LIST is the head of the double linked case list before it
4712 is sorted. Returns the head of the sorted list if we don't see any
4713 overlap, or NULL otherwise. */
4716 check_case_overlap (gfc_case *list)
4718 gfc_case *p, *q, *e, *tail;
4719 int insize, nmerges, psize, qsize, cmp, overlap_seen;
4721 /* If the passed list was empty, return immediately. */
4728 /* Loop unconditionally. The only exit from this loop is a return
4729 statement, when we've finished sorting the case list. */
4736 /* Count the number of merges we do in this pass. */
4739 /* Loop while there exists a merge to be done. */
4744 /* Count this merge. */
4747 /* Cut the list in two pieces by stepping INSIZE places
4748 forward in the list, starting from P. */
4751 for (i = 0; i < insize; i++)
4760 /* Now we have two lists. Merge them! */
4761 while (psize > 0 || (qsize > 0 && q != NULL))
4763 /* See from which the next case to merge comes from. */
4766 /* P is empty so the next case must come from Q. */
4771 else if (qsize == 0 || q == NULL)
4780 cmp = compare_cases (p, q);
4783 /* The whole case range for P is less than the
4791 /* The whole case range for Q is greater than
4792 the case range for P. */
4799 /* The cases overlap, or they are the same
4800 element in the list. Either way, we must
4801 issue an error and get the next case from P. */
4802 /* FIXME: Sort P and Q by line number. */
4803 gfc_error ("CASE label at %L overlaps with CASE "
4804 "label at %L", &p->where, &q->where);
4812 /* Add the next element to the merged list. */
4821 /* P has now stepped INSIZE places along, and so has Q. So
4822 they're the same. */
4827 /* If we have done only one merge or none at all, we've
4828 finished sorting the cases. */
4837 /* Otherwise repeat, merging lists twice the size. */
4843 /* Check to see if an expression is suitable for use in a CASE statement.
4844 Makes sure that all case expressions are scalar constants of the same
4845 type. Return FAILURE if anything is wrong. */
4848 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
4850 if (e == NULL) return SUCCESS;
4852 if (e->ts.type != case_expr->ts.type)
4854 gfc_error ("Expression in CASE statement at %L must be of type %s",
4855 &e->where, gfc_basic_typename (case_expr->ts.type));
4859 /* C805 (R808) For a given case-construct, each case-value shall be of
4860 the same type as case-expr. For character type, length differences
4861 are allowed, but the kind type parameters shall be the same. */
4863 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
4865 gfc_error("Expression in CASE statement at %L must be kind %d",
4866 &e->where, case_expr->ts.kind);
4870 /* Convert the case value kind to that of case expression kind, if needed.
4871 FIXME: Should a warning be issued? */
4872 if (e->ts.kind != case_expr->ts.kind)
4873 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
4877 gfc_error ("Expression in CASE statement at %L must be scalar",
4886 /* Given a completely parsed select statement, we:
4888 - Validate all expressions and code within the SELECT.
4889 - Make sure that the selection expression is not of the wrong type.
4890 - Make sure that no case ranges overlap.
4891 - Eliminate unreachable cases and unreachable code resulting from
4892 removing case labels.
4894 The standard does allow unreachable cases, e.g. CASE (5:3). But
4895 they are a hassle for code generation, and to prevent that, we just
4896 cut them out here. This is not necessary for overlapping cases
4897 because they are illegal and we never even try to generate code.
4899 We have the additional caveat that a SELECT construct could have
4900 been a computed GOTO in the source code. Fortunately we can fairly
4901 easily work around that here: The case_expr for a "real" SELECT CASE
4902 is in code->expr1, but for a computed GOTO it is in code->expr2. All
4903 we have to do is make sure that the case_expr is a scalar integer
4907 resolve_select (gfc_code *code)
4910 gfc_expr *case_expr;
4911 gfc_case *cp, *default_case, *tail, *head;
4912 int seen_unreachable;
4918 if (code->expr == NULL)
4920 /* This was actually a computed GOTO statement. */
4921 case_expr = code->expr2;
4922 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
4923 gfc_error ("Selection expression in computed GOTO statement "
4924 "at %L must be a scalar integer expression",
4927 /* Further checking is not necessary because this SELECT was built
4928 by the compiler, so it should always be OK. Just move the
4929 case_expr from expr2 to expr so that we can handle computed
4930 GOTOs as normal SELECTs from here on. */
4931 code->expr = code->expr2;
4936 case_expr = code->expr;
4938 type = case_expr->ts.type;
4939 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
4941 gfc_error ("Argument of SELECT statement at %L cannot be %s",
4942 &case_expr->where, gfc_typename (&case_expr->ts));
4944 /* Punt. Going on here just produce more garbage error messages. */
4948 if (case_expr->rank != 0)
4950 gfc_error ("Argument of SELECT statement at %L must be a scalar "
4951 "expression", &case_expr->where);
4957 /* PR 19168 has a long discussion concerning a mismatch of the kinds
4958 of the SELECT CASE expression and its CASE values. Walk the lists
4959 of case values, and if we find a mismatch, promote case_expr to
4960 the appropriate kind. */
4962 if (type == BT_LOGICAL || type == BT_INTEGER)
4964 for (body = code->block; body; body = body->block)
4966 /* Walk the case label list. */
4967 for (cp = body->ext.case_list; cp; cp = cp->next)
4969 /* Intercept the DEFAULT case. It does not have a kind. */
4970 if (cp->low == NULL && cp->high == NULL)
4973 /* Unreachable case ranges are discarded, so ignore. */
4974 if (cp->low != NULL && cp->high != NULL
4975 && cp->low != cp->high
4976 && gfc_compare_expr (cp->low, cp->high) > 0)
4979 /* FIXME: Should a warning be issued? */
4981 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
4982 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
4984 if (cp->high != NULL
4985 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
4986 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
4991 /* Assume there is no DEFAULT case. */
4992 default_case = NULL;
4997 for (body = code->block; body; body = body->block)
4999 /* Assume the CASE list is OK, and all CASE labels can be matched. */
5001 seen_unreachable = 0;
5003 /* Walk the case label list, making sure that all case labels
5005 for (cp = body->ext.case_list; cp; cp = cp->next)
5007 /* Count the number of cases in the whole construct. */
5010 /* Intercept the DEFAULT case. */
5011 if (cp->low == NULL && cp->high == NULL)
5013 if (default_case != NULL)
5015 gfc_error ("The DEFAULT CASE at %L cannot be followed "
5016 "by a second DEFAULT CASE at %L",
5017 &default_case->where, &cp->where);
5028 /* Deal with single value cases and case ranges. Errors are
5029 issued from the validation function. */
5030 if(validate_case_label_expr (cp->low, case_expr) != SUCCESS
5031 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
5037 if (type == BT_LOGICAL
5038 && ((cp->low == NULL || cp->high == NULL)
5039 || cp->low != cp->high))
5041 gfc_error ("Logical range in CASE statement at %L is not "
5042 "allowed", &cp->low->where);
5047 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
5050 value = cp->low->value.logical == 0 ? 2 : 1;
5051 if (value & seen_logical)
5053 gfc_error ("constant logical value in CASE statement "
5054 "is repeated at %L",
5059 seen_logical |= value;
5062 if (cp->low != NULL && cp->high != NULL
5063 && cp->low != cp->high
5064 && gfc_compare_expr (cp->low, cp->high) > 0)
5066 if (gfc_option.warn_surprising)
5067 gfc_warning ("Range specification at %L can never "
5068 "be matched", &cp->where);
5070 cp->unreachable = 1;
5071 seen_unreachable = 1;
5075 /* If the case range can be matched, it can also overlap with
5076 other cases. To make sure it does not, we put it in a
5077 double linked list here. We sort that with a merge sort
5078 later on to detect any overlapping cases. */
5082 head->right = head->left = NULL;
5087 tail->right->left = tail;
5094 /* It there was a failure in the previous case label, give up
5095 for this case label list. Continue with the next block. */
5099 /* See if any case labels that are unreachable have been seen.
5100 If so, we eliminate them. This is a bit of a kludge because
5101 the case lists for a single case statement (label) is a
5102 single forward linked lists. */
5103 if (seen_unreachable)
5105 /* Advance until the first case in the list is reachable. */
5106 while (body->ext.case_list != NULL
5107 && body->ext.case_list->unreachable)
5109 gfc_case *n = body->ext.case_list;
5110 body->ext.case_list = body->ext.case_list->next;
5112 gfc_free_case_list (n);
5115 /* Strip all other unreachable cases. */
5116 if (body->ext.case_list)
5118 for (cp = body->ext.case_list; cp->next; cp = cp->next)
5120 if (cp->next->unreachable)
5122 gfc_case *n = cp->next;
5123 cp->next = cp->next->next;
5125 gfc_free_case_list (n);
5132 /* See if there were overlapping cases. If the check returns NULL,
5133 there was overlap. In that case we don't do anything. If head
5134 is non-NULL, we prepend the DEFAULT case. The sorted list can
5135 then used during code generation for SELECT CASE constructs with
5136 a case expression of a CHARACTER type. */
5139 head = check_case_overlap (head);
5141 /* Prepend the default_case if it is there. */
5142 if (head != NULL && default_case)
5144 default_case->left = NULL;
5145 default_case->right = head;
5146 head->left = default_case;
5150 /* Eliminate dead blocks that may be the result if we've seen
5151 unreachable case labels for a block. */
5152 for (body = code; body && body->block; body = body->block)
5154 if (body->block->ext.case_list == NULL)
5156 /* Cut the unreachable block from the code chain. */
5157 gfc_code *c = body->block;
5158 body->block = c->block;
5160 /* Kill the dead block, but not the blocks below it. */
5162 gfc_free_statements (c);
5166 /* More than two cases is legal but insane for logical selects.
5167 Issue a warning for it. */
5168 if (gfc_option.warn_surprising && type == BT_LOGICAL
5170 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
5175 /* Resolve a transfer statement. This is making sure that:
5176 -- a derived type being transferred has only non-pointer components
5177 -- a derived type being transferred doesn't have private components, unless
5178 it's being transferred from the module where the type was defined
5179 -- we're not trying to transfer a whole assumed size array. */
5182 resolve_transfer (gfc_code *code)
5191 if (exp->expr_type != EXPR_VARIABLE && exp->expr_type != EXPR_FUNCTION)
5194 sym = exp->symtree->n.sym;
5197 /* Go to actual component transferred. */
5198 for (ref = code->expr->ref; ref; ref = ref->next)
5199 if (ref->type == REF_COMPONENT)
5200 ts = &ref->u.c.component->ts;
5202 if (ts->type == BT_DERIVED)
5204 /* Check that transferred derived type doesn't contain POINTER
5206 if (ts->derived->attr.pointer_comp)
5208 gfc_error ("Data transfer element at %L cannot have "
5209 "POINTER components", &code->loc);
5213 if (ts->derived->attr.alloc_comp)
5215 gfc_error ("Data transfer element at %L cannot have "
5216 "ALLOCATABLE components", &code->loc);
5220 if (derived_inaccessible (ts->derived))
5222 gfc_error ("Data transfer element at %L cannot have "
5223 "PRIVATE components",&code->loc);
5228 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
5229 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
5231 gfc_error ("Data transfer element at %L cannot be a full reference to "
5232 "an assumed-size array", &code->loc);
5238 /*********** Toplevel code resolution subroutines ***********/
5240 /* Find the set of labels that are reachable from this block. We also
5241 record the last statement in each block so that we don't have to do
5242 a linear search to find the END DO statements of the blocks. */
5245 reachable_labels (gfc_code *block)
5252 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
5254 /* Collect labels in this block. */
5255 for (c = block; c; c = c->next)
5258 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
5260 if (!c->next && cs_base->prev)
5261 cs_base->prev->tail = c;
5264 /* Merge with labels from parent block. */
5267 gcc_assert (cs_base->prev->reachable_labels);
5268 bitmap_ior_into (cs_base->reachable_labels,
5269 cs_base->prev->reachable_labels);
5273 /* Given a branch to a label and a namespace, if the branch is conforming.
5274 The code node describes where the branch is located. */
5277 resolve_branch (gfc_st_label *label, gfc_code *code)
5284 /* Step one: is this a valid branching target? */
5286 if (label->defined == ST_LABEL_UNKNOWN)
5288 gfc_error ("Label %d referenced at %L is never defined", label->value,
5293 if (label->defined != ST_LABEL_TARGET)
5295 gfc_error ("Statement at %L is not a valid branch target statement "
5296 "for the branch statement at %L", &label->where, &code->loc);
5300 /* Step two: make sure this branch is not a branch to itself ;-) */
5302 if (code->here == label)
5304 gfc_warning ("Branch at %L causes an infinite loop", &code->loc);
5308 /* Step three: See if the label is in the same block as the
5309 branching statement. The hard work has been done by setting up
5310 the bitmap reachable_labels. */
5312 if (!bitmap_bit_p (cs_base->reachable_labels, label->value))
5314 /* The label is not in an enclosing block, so illegal. This was
5315 allowed in Fortran 66, so we allow it as extension. No
5316 further checks are necessary in this case. */
5317 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
5318 "as the GOTO statement at %L", &label->where,
5323 /* Step four: Make sure that the branching target is legal if
5324 the statement is an END {SELECT,IF}. */
5326 for (stack = cs_base; stack; stack = stack->prev)
5327 if (stack->current->next && stack->current->next->here == label)
5330 if (stack && stack->current->next->op == EXEC_NOP)
5332 gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: GOTO at %L jumps to "
5333 "END of construct at %L", &code->loc,
5334 &stack->current->next->loc);
5335 return; /* We know this is not an END DO. */
5338 /* Step five: Make sure that we're not jumping to the end of a DO
5339 loop from within the loop. */
5341 for (stack = cs_base; stack; stack = stack->prev)
5342 if ((stack->current->op == EXEC_DO
5343 || stack->current->op == EXEC_DO_WHILE)
5344 && stack->tail->here == label && stack->tail->op == EXEC_NOP)
5346 gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: GOTO at %L jumps "
5347 "to END of construct at %L", &code->loc,
5355 /* Check whether EXPR1 has the same shape as EXPR2. */
5358 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
5360 mpz_t shape[GFC_MAX_DIMENSIONS];
5361 mpz_t shape2[GFC_MAX_DIMENSIONS];
5362 try result = FAILURE;
5365 /* Compare the rank. */
5366 if (expr1->rank != expr2->rank)
5369 /* Compare the size of each dimension. */
5370 for (i=0; i<expr1->rank; i++)
5372 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
5375 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
5378 if (mpz_cmp (shape[i], shape2[i]))
5382 /* When either of the two expression is an assumed size array, we
5383 ignore the comparison of dimension sizes. */
5388 for (i--; i >= 0; i--)
5390 mpz_clear (shape[i]);
5391 mpz_clear (shape2[i]);
5397 /* Check whether a WHERE assignment target or a WHERE mask expression
5398 has the same shape as the outmost WHERE mask expression. */
5401 resolve_where (gfc_code *code, gfc_expr *mask)
5407 cblock = code->block;
5409 /* Store the first WHERE mask-expr of the WHERE statement or construct.
5410 In case of nested WHERE, only the outmost one is stored. */
5411 if (mask == NULL) /* outmost WHERE */
5413 else /* inner WHERE */
5420 /* Check if the mask-expr has a consistent shape with the
5421 outmost WHERE mask-expr. */
5422 if (resolve_where_shape (cblock->expr, e) == FAILURE)
5423 gfc_error ("WHERE mask at %L has inconsistent shape",
5424 &cblock->expr->where);
5427 /* the assignment statement of a WHERE statement, or the first
5428 statement in where-body-construct of a WHERE construct */
5429 cnext = cblock->next;
5434 /* WHERE assignment statement */
5437 /* Check shape consistent for WHERE assignment target. */
5438 if (e && resolve_where_shape (cnext->expr, e) == FAILURE)
5439 gfc_error ("WHERE assignment target at %L has "
5440 "inconsistent shape", &cnext->expr->where);
5444 case EXEC_ASSIGN_CALL:
5445 resolve_call (cnext);
5448 /* WHERE or WHERE construct is part of a where-body-construct */
5450 resolve_where (cnext, e);
5454 gfc_error ("Unsupported statement inside WHERE at %L",
5457 /* the next statement within the same where-body-construct */
5458 cnext = cnext->next;
5460 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
5461 cblock = cblock->block;
5466 /* Check whether the FORALL index appears in the expression or not. */
5469 gfc_find_forall_index (gfc_expr *expr, gfc_symbol *symbol)
5473 gfc_actual_arglist *args;
5476 switch (expr->expr_type)
5479 gcc_assert (expr->symtree->n.sym);
5481 /* A scalar assignment */
5484 if (expr->symtree->n.sym == symbol)
5490 /* the expr is array ref, substring or struct component. */
5497 /* Check if the symbol appears in the array subscript. */
5499 for (i = 0; i < GFC_MAX_DIMENSIONS; i++)
5502 if (gfc_find_forall_index (ar.start[i], symbol) == SUCCESS)
5506 if (gfc_find_forall_index (ar.end[i], symbol) == SUCCESS)
5510 if (gfc_find_forall_index (ar.stride[i], symbol) == SUCCESS)
5516 if (expr->symtree->n.sym == symbol)
5519 /* Check if the symbol appears in the substring section. */
5520 if (gfc_find_forall_index (tmp->u.ss.start, symbol) == SUCCESS)
5522 if (gfc_find_forall_index (tmp->u.ss.end, symbol) == SUCCESS)
5530 gfc_error("expression reference type error at %L", &expr->where);
5536 /* If the expression is a function call, then check if the symbol
5537 appears in the actual arglist of the function. */
5539 for (args = expr->value.function.actual; args; args = args->next)
5541 if (gfc_find_forall_index(args->expr,symbol) == SUCCESS)
5546 /* It seems not to happen. */
5547 case EXPR_SUBSTRING:
5551 gcc_assert (expr->ref->type == REF_SUBSTRING);
5552 if (gfc_find_forall_index (tmp->u.ss.start, symbol) == SUCCESS)
5554 if (gfc_find_forall_index (tmp->u.ss.end, symbol) == SUCCESS)
5559 /* It seems not to happen. */
5560 case EXPR_STRUCTURE:
5562 gfc_error ("Unsupported statement while finding forall index in "
5567 /* Find the FORALL index in the first operand. */
5568 if (expr->value.op.op1)
5570 if (gfc_find_forall_index (expr->value.op.op1, symbol) == SUCCESS)
5574 /* Find the FORALL index in the second operand. */
5575 if (expr->value.op.op2)
5577 if (gfc_find_forall_index (expr->value.op.op2, symbol) == SUCCESS)
5590 /* Resolve assignment in FORALL construct.
5591 NVAR is the number of FORALL index variables, and VAR_EXPR records the
5592 FORALL index variables. */
5595 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
5599 for (n = 0; n < nvar; n++)
5601 gfc_symbol *forall_index;
5603 forall_index = var_expr[n]->symtree->n.sym;
5605 /* Check whether the assignment target is one of the FORALL index
5607 if ((code->expr->expr_type == EXPR_VARIABLE)
5608 && (code->expr->symtree->n.sym == forall_index))
5609 gfc_error ("Assignment to a FORALL index variable at %L",
5610 &code->expr->where);
5613 /* If one of the FORALL index variables doesn't appear in the
5614 assignment target, then there will be a many-to-one
5616 if (gfc_find_forall_index (code->expr, forall_index) == FAILURE)
5617 gfc_error ("The FORALL with index '%s' cause more than one "
5618 "assignment to this object at %L",
5619 var_expr[n]->symtree->name, &code->expr->where);
5625 /* Resolve WHERE statement in FORALL construct. */
5628 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
5629 gfc_expr **var_expr)
5634 cblock = code->block;
5637 /* the assignment statement of a WHERE statement, or the first
5638 statement in where-body-construct of a WHERE construct */
5639 cnext = cblock->next;
5644 /* WHERE assignment statement */
5646 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
5649 /* WHERE operator assignment statement */
5650 case EXEC_ASSIGN_CALL:
5651 resolve_call (cnext);
5654 /* WHERE or WHERE construct is part of a where-body-construct */
5656 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
5660 gfc_error ("Unsupported statement inside WHERE at %L",
5663 /* the next statement within the same where-body-construct */
5664 cnext = cnext->next;
5666 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
5667 cblock = cblock->block;
5672 /* Traverse the FORALL body to check whether the following errors exist:
5673 1. For assignment, check if a many-to-one assignment happens.
5674 2. For WHERE statement, check the WHERE body to see if there is any
5675 many-to-one assignment. */
5678 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
5682 c = code->block->next;
5688 case EXEC_POINTER_ASSIGN:
5689 gfc_resolve_assign_in_forall (c, nvar, var_expr);
5692 case EXEC_ASSIGN_CALL:
5696 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
5697 there is no need to handle it here. */
5701 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
5706 /* The next statement in the FORALL body. */
5712 /* Given a FORALL construct, first resolve the FORALL iterator, then call
5713 gfc_resolve_forall_body to resolve the FORALL body. */
5716 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
5718 static gfc_expr **var_expr;
5719 static int total_var = 0;
5720 static int nvar = 0;
5721 gfc_forall_iterator *fa;
5722 gfc_symbol *forall_index;
5726 /* Start to resolve a FORALL construct */
5727 if (forall_save == 0)
5729 /* Count the total number of FORALL index in the nested FORALL
5730 construct in order to allocate the VAR_EXPR with proper size. */
5732 while ((next != NULL) && (next->op == EXEC_FORALL))
5734 for (fa = next->ext.forall_iterator; fa; fa = fa->next)
5736 next = next->block->next;
5739 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
5740 var_expr = (gfc_expr **) gfc_getmem (total_var * sizeof (gfc_expr *));
5743 /* The information about FORALL iterator, including FORALL index start, end
5744 and stride. The FORALL index can not appear in start, end or stride. */
5745 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
5747 /* Check if any outer FORALL index name is the same as the current
5749 for (i = 0; i < nvar; i++)
5751 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
5753 gfc_error ("An outer FORALL construct already has an index "
5754 "with this name %L", &fa->var->where);
5758 /* Record the current FORALL index. */
5759 var_expr[nvar] = gfc_copy_expr (fa->var);
5761 forall_index = fa->var->symtree->n.sym;
5763 /* Check if the FORALL index appears in start, end or stride. */
5764 if (gfc_find_forall_index (fa->start, forall_index) == SUCCESS)
5765 gfc_error ("A FORALL index must not appear in a limit or stride "
5766 "expression in the same FORALL at %L", &fa->start->where);
5767 if (gfc_find_forall_index (fa->end, forall_index) == SUCCESS)
5768 gfc_error ("A FORALL index must not appear in a limit or stride "
5769 "expression in the same FORALL at %L", &fa->end->where);
5770 if (gfc_find_forall_index (fa->stride, forall_index) == SUCCESS)
5771 gfc_error ("A FORALL index must not appear in a limit or stride "
5772 "expression in the same FORALL at %L", &fa->stride->where);
5776 /* Resolve the FORALL body. */
5777 gfc_resolve_forall_body (code, nvar, var_expr);
5779 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
5780 gfc_resolve_blocks (code->block, ns);
5782 /* Free VAR_EXPR after the whole FORALL construct resolved. */
5783 for (i = 0; i < total_var; i++)
5784 gfc_free_expr (var_expr[i]);
5786 /* Reset the counters. */
5792 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL ,GOTO and
5795 static void resolve_code (gfc_code *, gfc_namespace *);
5798 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
5802 for (; b; b = b->block)
5804 t = gfc_resolve_expr (b->expr);
5805 if (gfc_resolve_expr (b->expr2) == FAILURE)
5811 if (t == SUCCESS && b->expr != NULL
5812 && (b->expr->ts.type != BT_LOGICAL || b->expr->rank != 0))
5813 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
5820 && (b->expr->ts.type != BT_LOGICAL || b->expr->rank == 0))
5821 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
5826 resolve_branch (b->label, b);
5838 case EXEC_OMP_ATOMIC:
5839 case EXEC_OMP_CRITICAL:
5841 case EXEC_OMP_MASTER:
5842 case EXEC_OMP_ORDERED:
5843 case EXEC_OMP_PARALLEL:
5844 case EXEC_OMP_PARALLEL_DO:
5845 case EXEC_OMP_PARALLEL_SECTIONS:
5846 case EXEC_OMP_PARALLEL_WORKSHARE:
5847 case EXEC_OMP_SECTIONS:
5848 case EXEC_OMP_SINGLE:
5849 case EXEC_OMP_WORKSHARE:
5853 gfc_internal_error ("resolve_block(): Bad block type");
5856 resolve_code (b->next, ns);
5861 static gfc_component *
5862 has_default_initializer (gfc_symbol *der)
5865 for (c = der->components; c; c = c->next)
5866 if ((c->ts.type != BT_DERIVED && c->initializer)
5867 || (c->ts.type == BT_DERIVED
5869 && has_default_initializer (c->ts.derived)))
5876 /* Given a block of code, recursively resolve everything pointed to by this
5880 resolve_code (gfc_code *code, gfc_namespace *ns)
5882 int omp_workshare_save;
5888 frame.prev = cs_base;
5892 reachable_labels (code);
5894 for (; code; code = code->next)
5896 frame.current = code;
5897 forall_save = forall_flag;
5899 if (code->op == EXEC_FORALL)
5902 gfc_resolve_forall (code, ns, forall_save);
5905 else if (code->block)
5907 omp_workshare_save = -1;
5910 case EXEC_OMP_PARALLEL_WORKSHARE:
5911 omp_workshare_save = omp_workshare_flag;
5912 omp_workshare_flag = 1;
5913 gfc_resolve_omp_parallel_blocks (code, ns);
5915 case EXEC_OMP_PARALLEL:
5916 case EXEC_OMP_PARALLEL_DO:
5917 case EXEC_OMP_PARALLEL_SECTIONS:
5918 omp_workshare_save = omp_workshare_flag;
5919 omp_workshare_flag = 0;
5920 gfc_resolve_omp_parallel_blocks (code, ns);
5923 gfc_resolve_omp_do_blocks (code, ns);
5925 case EXEC_OMP_WORKSHARE:
5926 omp_workshare_save = omp_workshare_flag;
5927 omp_workshare_flag = 1;
5930 gfc_resolve_blocks (code->block, ns);
5934 if (omp_workshare_save != -1)
5935 omp_workshare_flag = omp_workshare_save;
5938 t = gfc_resolve_expr (code->expr);
5939 forall_flag = forall_save;
5941 if (gfc_resolve_expr (code->expr2) == FAILURE)
5956 /* Keep track of which entry we are up to. */
5957 current_entry_id = code->ext.entry->id;
5961 resolve_where (code, NULL);
5965 if (code->expr != NULL)
5967 if (code->expr->ts.type != BT_INTEGER)
5968 gfc_error ("ASSIGNED GOTO statement at %L requires an "
5969 "INTEGER variable", &code->expr->where);
5970 else if (code->expr->symtree->n.sym->attr.assign != 1)
5971 gfc_error ("Variable '%s' has not been assigned a target "
5972 "label at %L", code->expr->symtree->n.sym->name,
5973 &code->expr->where);
5976 resolve_branch (code->label, code);
5980 if (code->expr != NULL
5981 && (code->expr->ts.type != BT_INTEGER || code->expr->rank))
5982 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
5983 "INTEGER return specifier", &code->expr->where);
5986 case EXEC_INIT_ASSIGN:
5993 if (gfc_extend_assign (code, ns) == SUCCESS)
5995 gfc_expr *lhs = code->ext.actual->expr;
5996 gfc_expr *rhs = code->ext.actual->next->expr;
5998 if (gfc_pure (NULL) && !gfc_pure (code->symtree->n.sym))
6000 gfc_error ("Subroutine '%s' called instead of assignment at "
6001 "%L must be PURE", code->symtree->n.sym->name,
6006 /* Make a temporary rhs when there is a default initializer
6007 and rhs is the same symbol as the lhs. */
6008 if (rhs->expr_type == EXPR_VARIABLE
6009 && rhs->symtree->n.sym->ts.type == BT_DERIVED
6010 && has_default_initializer (rhs->symtree->n.sym->ts.derived)
6011 && (lhs->symtree->n.sym == rhs->symtree->n.sym))
6012 code->ext.actual->next->expr = gfc_get_parentheses (rhs);
6017 if (code->expr->ts.type == BT_CHARACTER
6018 && gfc_option.warn_character_truncation)
6020 int llen = 0, rlen = 0;
6022 if (code->expr->ts.cl != NULL
6023 && code->expr->ts.cl->length != NULL
6024 && code->expr->ts.cl->length->expr_type == EXPR_CONSTANT)
6025 llen = mpz_get_si (code->expr->ts.cl->length->value.integer);
6027 if (code->expr2->expr_type == EXPR_CONSTANT)
6028 rlen = code->expr2->value.character.length;
6030 else if (code->expr2->ts.cl != NULL
6031 && code->expr2->ts.cl->length != NULL
6032 && code->expr2->ts.cl->length->expr_type
6034 rlen = mpz_get_si (code->expr2->ts.cl->length->value.integer);
6036 if (rlen && llen && rlen > llen)
6037 gfc_warning_now ("CHARACTER expression will be truncated "
6038 "in assignment (%d/%d) at %L",
6039 llen, rlen, &code->loc);
6042 if (gfc_pure (NULL))
6044 if (gfc_impure_variable (code->expr->symtree->n.sym))
6046 gfc_error ("Cannot assign to variable '%s' in PURE "
6048 code->expr->symtree->n.sym->name,
6049 &code->expr->where);
6053 if (code->expr->ts.type == BT_DERIVED
6054 && code->expr->expr_type == EXPR_VARIABLE
6055 && code->expr->ts.derived->attr.pointer_comp
6056 && gfc_impure_variable (code->expr2->symtree->n.sym))
6058 gfc_error ("The impure variable at %L is assigned to "
6059 "a derived type variable with a POINTER "
6060 "component in a PURE procedure (12.6)",
6061 &code->expr2->where);
6066 gfc_check_assign (code->expr, code->expr2, 1);
6069 case EXEC_LABEL_ASSIGN:
6070 if (code->label->defined == ST_LABEL_UNKNOWN)
6071 gfc_error ("Label %d referenced at %L is never defined",
6072 code->label->value, &code->label->where);
6074 && (code->expr->expr_type != EXPR_VARIABLE
6075 || code->expr->symtree->n.sym->ts.type != BT_INTEGER
6076 || code->expr->symtree->n.sym->ts.kind
6077 != gfc_default_integer_kind
6078 || code->expr->symtree->n.sym->as != NULL))
6079 gfc_error ("ASSIGN statement at %L requires a scalar "
6080 "default INTEGER variable", &code->expr->where);
6083 case EXEC_POINTER_ASSIGN:
6087 gfc_check_pointer_assign (code->expr, code->expr2);
6090 case EXEC_ARITHMETIC_IF:
6092 && code->expr->ts.type != BT_INTEGER
6093 && code->expr->ts.type != BT_REAL)
6094 gfc_error ("Arithmetic IF statement at %L requires a numeric "
6095 "expression", &code->expr->where);
6097 resolve_branch (code->label, code);
6098 resolve_branch (code->label2, code);
6099 resolve_branch (code->label3, code);
6103 if (t == SUCCESS && code->expr != NULL
6104 && (code->expr->ts.type != BT_LOGICAL
6105 || code->expr->rank != 0))
6106 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
6107 &code->expr->where);
6112 resolve_call (code);
6116 /* Select is complicated. Also, a SELECT construct could be
6117 a transformed computed GOTO. */
6118 resolve_select (code);
6122 if (code->ext.iterator != NULL)
6124 gfc_iterator *iter = code->ext.iterator;
6125 if (gfc_resolve_iterator (iter, true) != FAILURE)
6126 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
6131 if (code->expr == NULL)
6132 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
6134 && (code->expr->rank != 0
6135 || code->expr->ts.type != BT_LOGICAL))
6136 gfc_error ("Exit condition of DO WHILE loop at %L must be "
6137 "a scalar LOGICAL expression", &code->expr->where);
6141 if (t == SUCCESS && code->expr != NULL
6142 && code->expr->ts.type != BT_INTEGER)
6143 gfc_error ("STAT tag in ALLOCATE statement at %L must be "
6144 "of type INTEGER", &code->expr->where);
6146 for (a = code->ext.alloc_list; a; a = a->next)
6147 resolve_allocate_expr (a->expr, code);
6151 case EXEC_DEALLOCATE:
6152 if (t == SUCCESS && code->expr != NULL
6153 && code->expr->ts.type != BT_INTEGER)
6155 ("STAT tag in DEALLOCATE statement at %L must be of type "
6156 "INTEGER", &code->expr->where);
6158 for (a = code->ext.alloc_list; a; a = a->next)
6159 resolve_deallocate_expr (a->expr);
6164 if (gfc_resolve_open (code->ext.open) == FAILURE)
6167 resolve_branch (code->ext.open->err, code);
6171 if (gfc_resolve_close (code->ext.close) == FAILURE)
6174 resolve_branch (code->ext.close->err, code);
6177 case EXEC_BACKSPACE:
6181 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
6184 resolve_branch (code->ext.filepos->err, code);
6188 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
6191 resolve_branch (code->ext.inquire->err, code);
6195 gcc_assert (code->ext.inquire != NULL);
6196 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
6199 resolve_branch (code->ext.inquire->err, code);
6204 if (gfc_resolve_dt (code->ext.dt) == FAILURE)
6207 resolve_branch (code->ext.dt->err, code);
6208 resolve_branch (code->ext.dt->end, code);
6209 resolve_branch (code->ext.dt->eor, code);
6213 resolve_transfer (code);
6217 resolve_forall_iterators (code->ext.forall_iterator);
6219 if (code->expr != NULL && code->expr->ts.type != BT_LOGICAL)
6220 gfc_error ("FORALL mask clause at %L requires a LOGICAL "
6221 "expression", &code->expr->where);
6224 case EXEC_OMP_ATOMIC:
6225 case EXEC_OMP_BARRIER:
6226 case EXEC_OMP_CRITICAL:
6227 case EXEC_OMP_FLUSH:
6229 case EXEC_OMP_MASTER:
6230 case EXEC_OMP_ORDERED:
6231 case EXEC_OMP_SECTIONS:
6232 case EXEC_OMP_SINGLE:
6233 case EXEC_OMP_WORKSHARE:
6234 gfc_resolve_omp_directive (code, ns);
6237 case EXEC_OMP_PARALLEL:
6238 case EXEC_OMP_PARALLEL_DO:
6239 case EXEC_OMP_PARALLEL_SECTIONS:
6240 case EXEC_OMP_PARALLEL_WORKSHARE:
6241 omp_workshare_save = omp_workshare_flag;
6242 omp_workshare_flag = 0;
6243 gfc_resolve_omp_directive (code, ns);
6244 omp_workshare_flag = omp_workshare_save;
6248 gfc_internal_error ("resolve_code(): Bad statement code");
6252 cs_base = frame.prev;
6256 /* Resolve initial values and make sure they are compatible with
6260 resolve_values (gfc_symbol *sym)
6262 if (sym->value == NULL)
6265 if (gfc_resolve_expr (sym->value) == FAILURE)
6268 gfc_check_assign_symbol (sym, sym->value);
6272 /* Verify the binding labels for common blocks that are BIND(C). The label
6273 for a BIND(C) common block must be identical in all scoping units in which
6274 the common block is declared. Further, the binding label can not collide
6275 with any other global entity in the program. */
6278 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
6280 if (comm_block_tree->n.common->is_bind_c == 1)
6282 gfc_gsymbol *binding_label_gsym;
6283 gfc_gsymbol *comm_name_gsym;
6285 /* See if a global symbol exists by the common block's name. It may
6286 be NULL if the common block is use-associated. */
6287 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
6288 comm_block_tree->n.common->name);
6289 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
6290 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
6291 "with the global entity '%s' at %L",
6292 comm_block_tree->n.common->binding_label,
6293 comm_block_tree->n.common->name,
6294 &(comm_block_tree->n.common->where),
6295 comm_name_gsym->name, &(comm_name_gsym->where));
6296 else if (comm_name_gsym != NULL
6297 && strcmp (comm_name_gsym->name,
6298 comm_block_tree->n.common->name) == 0)
6300 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
6302 if (comm_name_gsym->binding_label == NULL)
6303 /* No binding label for common block stored yet; save this one. */
6304 comm_name_gsym->binding_label =
6305 comm_block_tree->n.common->binding_label;
6307 if (strcmp (comm_name_gsym->binding_label,
6308 comm_block_tree->n.common->binding_label) != 0)
6310 /* Common block names match but binding labels do not. */
6311 gfc_error ("Binding label '%s' for common block '%s' at %L "
6312 "does not match the binding label '%s' for common "
6314 comm_block_tree->n.common->binding_label,
6315 comm_block_tree->n.common->name,
6316 &(comm_block_tree->n.common->where),
6317 comm_name_gsym->binding_label,
6318 comm_name_gsym->name,
6319 &(comm_name_gsym->where));
6324 /* There is no binding label (NAME="") so we have nothing further to
6325 check and nothing to add as a global symbol for the label. */
6326 if (comm_block_tree->n.common->binding_label[0] == '\0' )
6329 binding_label_gsym =
6330 gfc_find_gsymbol (gfc_gsym_root,
6331 comm_block_tree->n.common->binding_label);
6332 if (binding_label_gsym == NULL)
6334 /* Need to make a global symbol for the binding label to prevent
6335 it from colliding with another. */
6336 binding_label_gsym =
6337 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
6338 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
6339 binding_label_gsym->type = GSYM_COMMON;
6343 /* If comm_name_gsym is NULL, the name common block is use
6344 associated and the name could be colliding. */
6345 if (binding_label_gsym->type != GSYM_COMMON)
6346 gfc_error ("Binding label '%s' for common block '%s' at %L "
6347 "collides with the global entity '%s' at %L",
6348 comm_block_tree->n.common->binding_label,
6349 comm_block_tree->n.common->name,
6350 &(comm_block_tree->n.common->where),
6351 binding_label_gsym->name,
6352 &(binding_label_gsym->where));
6353 else if (comm_name_gsym != NULL
6354 && (strcmp (binding_label_gsym->name,
6355 comm_name_gsym->binding_label) != 0)
6356 && (strcmp (binding_label_gsym->sym_name,
6357 comm_name_gsym->name) != 0))
6358 gfc_error ("Binding label '%s' for common block '%s' at %L "
6359 "collides with global entity '%s' at %L",
6360 binding_label_gsym->name, binding_label_gsym->sym_name,
6361 &(comm_block_tree->n.common->where),
6362 comm_name_gsym->name, &(comm_name_gsym->where));
6370 /* Verify any BIND(C) derived types in the namespace so we can report errors
6371 for them once, rather than for each variable declared of that type. */
6374 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
6376 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
6377 && derived_sym->attr.is_bind_c == 1)
6378 verify_bind_c_derived_type (derived_sym);
6384 /* Verify that any binding labels used in a given namespace do not collide
6385 with the names or binding labels of any global symbols. */
6388 gfc_verify_binding_labels (gfc_symbol *sym)
6392 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
6393 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
6395 gfc_gsymbol *bind_c_sym;
6397 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
6398 if (bind_c_sym != NULL
6399 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
6401 if (sym->attr.if_source == IFSRC_DECL
6402 && (bind_c_sym->type != GSYM_SUBROUTINE
6403 && bind_c_sym->type != GSYM_FUNCTION)
6404 && ((sym->attr.contained == 1
6405 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
6406 || (sym->attr.use_assoc == 1
6407 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
6409 /* Make sure global procedures don't collide with anything. */
6410 gfc_error ("Binding label '%s' at %L collides with the global "
6411 "entity '%s' at %L", sym->binding_label,
6412 &(sym->declared_at), bind_c_sym->name,
6413 &(bind_c_sym->where));
6416 else if (sym->attr.contained == 0
6417 && (sym->attr.if_source == IFSRC_IFBODY
6418 && sym->attr.flavor == FL_PROCEDURE)
6419 && (bind_c_sym->sym_name != NULL
6420 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
6422 /* Make sure procedures in interface bodies don't collide. */
6423 gfc_error ("Binding label '%s' in interface body at %L collides "
6424 "with the global entity '%s' at %L",
6426 &(sym->declared_at), bind_c_sym->name,
6427 &(bind_c_sym->where));
6430 else if (sym->attr.contained == 0
6431 && (sym->attr.if_source == IFSRC_UNKNOWN))
6432 if ((sym->attr.use_assoc
6433 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))
6434 || sym->attr.use_assoc == 0)
6436 gfc_error ("Binding label '%s' at %L collides with global "
6437 "entity '%s' at %L", sym->binding_label,
6438 &(sym->declared_at), bind_c_sym->name,
6439 &(bind_c_sym->where));
6444 /* Clear the binding label to prevent checking multiple times. */
6445 sym->binding_label[0] = '\0';
6447 else if (bind_c_sym == NULL)
6449 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
6450 bind_c_sym->where = sym->declared_at;
6451 bind_c_sym->sym_name = sym->name;
6453 if (sym->attr.use_assoc == 1)
6454 bind_c_sym->mod_name = sym->module;
6456 if (sym->ns->proc_name != NULL)
6457 bind_c_sym->mod_name = sym->ns->proc_name->name;
6459 if (sym->attr.contained == 0)
6461 if (sym->attr.subroutine)
6462 bind_c_sym->type = GSYM_SUBROUTINE;
6463 else if (sym->attr.function)
6464 bind_c_sym->type = GSYM_FUNCTION;
6472 /* Resolve an index expression. */
6475 resolve_index_expr (gfc_expr *e)
6477 if (gfc_resolve_expr (e) == FAILURE)
6480 if (gfc_simplify_expr (e, 0) == FAILURE)
6483 if (gfc_specification_expr (e) == FAILURE)
6489 /* Resolve a charlen structure. */
6492 resolve_charlen (gfc_charlen *cl)
6501 specification_expr = 1;
6503 if (resolve_index_expr (cl->length) == FAILURE)
6505 specification_expr = 0;
6509 /* "If the character length parameter value evaluates to a negative
6510 value, the length of character entities declared is zero." */
6511 if (cl->length && !gfc_extract_int (cl->length, &i) && i <= 0)
6513 gfc_warning_now ("CHARACTER variable has zero length at %L",
6514 &cl->length->where);
6515 gfc_replace_expr (cl->length, gfc_int_expr (0));
6522 /* Test for non-constant shape arrays. */
6525 is_non_constant_shape_array (gfc_symbol *sym)
6531 not_constant = false;
6532 if (sym->as != NULL)
6534 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
6535 has not been simplified; parameter array references. Do the
6536 simplification now. */
6537 for (i = 0; i < sym->as->rank; i++)
6539 e = sym->as->lower[i];
6540 if (e && (resolve_index_expr (e) == FAILURE
6541 || !gfc_is_constant_expr (e)))
6542 not_constant = true;
6544 e = sym->as->upper[i];
6545 if (e && (resolve_index_expr (e) == FAILURE
6546 || !gfc_is_constant_expr (e)))
6547 not_constant = true;
6550 return not_constant;
6554 /* Assign the default initializer to a derived type variable or result. */
6557 apply_default_init (gfc_symbol *sym)
6560 gfc_expr *init = NULL;
6562 gfc_namespace *ns = sym->ns;
6564 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
6567 if (sym->ts.type == BT_DERIVED && sym->ts.derived)
6568 init = gfc_default_initializer (&sym->ts);
6573 /* Search for the function namespace if this is a contained
6574 function without an explicit result. */
6575 if (sym->attr.function && sym == sym->result
6576 && sym->name != sym->ns->proc_name->name)
6579 for (;ns; ns = ns->sibling)
6580 if (strcmp (ns->proc_name->name, sym->name) == 0)
6586 gfc_free_expr (init);
6590 /* Build an l-value expression for the result. */
6591 lval = gfc_lval_expr_from_sym (sym);
6593 /* Add the code at scope entry. */
6594 init_st = gfc_get_code ();
6595 init_st->next = ns->code;
6598 /* Assign the default initializer to the l-value. */
6599 init_st->loc = sym->declared_at;
6600 init_st->op = EXEC_INIT_ASSIGN;
6601 init_st->expr = lval;
6602 init_st->expr2 = init;
6606 /* Resolution of common features of flavors variable and procedure. */
6609 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
6611 /* Constraints on deferred shape variable. */
6612 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
6614 if (sym->attr.allocatable)
6616 if (sym->attr.dimension)
6617 gfc_error ("Allocatable array '%s' at %L must have "
6618 "a deferred shape", sym->name, &sym->declared_at);
6620 gfc_error ("Scalar object '%s' at %L may not be ALLOCATABLE",
6621 sym->name, &sym->declared_at);
6625 if (sym->attr.pointer && sym->attr.dimension)
6627 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
6628 sym->name, &sym->declared_at);
6635 if (!mp_flag && !sym->attr.allocatable
6636 && !sym->attr.pointer && !sym->attr.dummy)
6638 gfc_error ("Array '%s' at %L cannot have a deferred shape",
6639 sym->name, &sym->declared_at);
6647 /* Resolve symbols with flavor variable. */
6650 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
6656 const char *auto_save_msg;
6658 auto_save_msg = "automatic object '%s' at %L cannot have the "
6661 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
6664 /* Set this flag to check that variables are parameters of all entries.
6665 This check is effected by the call to gfc_resolve_expr through
6666 is_non_constant_shape_array. */
6667 specification_expr = 1;
6669 if (!sym->attr.use_assoc
6670 && !sym->attr.allocatable
6671 && !sym->attr.pointer
6672 && is_non_constant_shape_array (sym))
6674 /* The shape of a main program or module array needs to be
6676 if (sym->ns->proc_name
6677 && (sym->ns->proc_name->attr.flavor == FL_MODULE
6678 || sym->ns->proc_name->attr.is_main_program))
6680 gfc_error ("The module or main program array '%s' at %L must "
6681 "have constant shape", sym->name, &sym->declared_at);
6682 specification_expr = 0;
6687 if (sym->ts.type == BT_CHARACTER)
6689 /* Make sure that character string variables with assumed length are
6691 e = sym->ts.cl->length;
6692 if (e == NULL && !sym->attr.dummy && !sym->attr.result)
6694 gfc_error ("Entity with assumed character length at %L must be a "
6695 "dummy argument or a PARAMETER", &sym->declared_at);
6699 if (e && sym->attr.save && !gfc_is_constant_expr (e))
6701 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
6705 if (!gfc_is_constant_expr (e)
6706 && !(e->expr_type == EXPR_VARIABLE
6707 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
6708 && sym->ns->proc_name
6709 && (sym->ns->proc_name->attr.flavor == FL_MODULE
6710 || sym->ns->proc_name->attr.is_main_program)
6711 && !sym->attr.use_assoc)
6713 gfc_error ("'%s' at %L must have constant character length "
6714 "in this context", sym->name, &sym->declared_at);
6719 /* Can the symbol have an initializer? */
6721 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
6722 || sym->attr.intrinsic || sym->attr.result)
6724 else if (sym->attr.dimension && !sym->attr.pointer)
6726 /* Don't allow initialization of automatic arrays. */
6727 for (i = 0; i < sym->as->rank; i++)
6729 if (sym->as->lower[i] == NULL
6730 || sym->as->lower[i]->expr_type != EXPR_CONSTANT
6731 || sym->as->upper[i] == NULL
6732 || sym->as->upper[i]->expr_type != EXPR_CONSTANT)
6739 /* Also, they must not have the SAVE attribute.
6740 SAVE_IMPLICIT is checked below. */
6741 if (flag && sym->attr.save == SAVE_EXPLICIT)
6743 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
6748 /* Reject illegal initializers. */
6749 if (!sym->mark && sym->value && flag)
6751 if (sym->attr.allocatable)
6752 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
6753 sym->name, &sym->declared_at);
6754 else if (sym->attr.external)
6755 gfc_error ("External '%s' at %L cannot have an initializer",
6756 sym->name, &sym->declared_at);
6757 else if (sym->attr.dummy
6758 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
6759 gfc_error ("Dummy '%s' at %L cannot have an initializer",
6760 sym->name, &sym->declared_at);
6761 else if (sym->attr.intrinsic)
6762 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
6763 sym->name, &sym->declared_at);
6764 else if (sym->attr.result)
6765 gfc_error ("Function result '%s' at %L cannot have an initializer",
6766 sym->name, &sym->declared_at);
6768 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
6769 sym->name, &sym->declared_at);
6776 /* Check to see if a derived type is blocked from being host associated
6777 by the presence of another class I symbol in the same namespace.
6778 14.6.1.3 of the standard and the discussion on comp.lang.fortran. */
6779 if (sym->ts.type == BT_DERIVED && sym->ns != sym->ts.derived->ns
6780 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
6783 gfc_find_symbol (sym->ts.derived->name, sym->ns, 0, &s);
6784 if (s && (s->attr.flavor != FL_DERIVED
6785 || !gfc_compare_derived_types (s, sym->ts.derived)))
6787 gfc_error ("The type %s cannot be host associated at %L because "
6788 "it is blocked by an incompatible object of the same "
6789 "name at %L", sym->ts.derived->name, &sym->declared_at,
6795 /* Do not use gfc_default_initializer to test for a default initializer
6796 in the fortran because it generates a hidden default for allocatable
6799 if (sym->ts.type == BT_DERIVED && !(sym->value || flag))
6800 c = has_default_initializer (sym->ts.derived);
6802 /* 4th constraint in section 11.3: "If an object of a type for which
6803 component-initialization is specified (R429) appears in the
6804 specification-part of a module and does not have the ALLOCATABLE
6805 or POINTER attribute, the object shall have the SAVE attribute." */
6806 if (c && sym->ns->proc_name
6807 && sym->ns->proc_name->attr.flavor == FL_MODULE
6808 && !sym->ns->save_all && !sym->attr.save
6809 && !sym->attr.pointer && !sym->attr.allocatable)
6811 gfc_error("Object '%s' at %L must have the SAVE attribute %s",
6812 sym->name, &sym->declared_at,
6813 "for default initialization of a component");
6817 /* Assign default initializer. */
6818 if (sym->ts.type == BT_DERIVED
6820 && !sym->attr.pointer
6821 && !sym->attr.allocatable
6822 && (!flag || sym->attr.intent == INTENT_OUT))
6823 sym->value = gfc_default_initializer (&sym->ts);
6829 /* Resolve a procedure. */
6832 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
6834 gfc_formal_arglist *arg;
6836 if (sym->attr.ambiguous_interfaces && !sym->attr.referenced)
6837 gfc_warning ("Although not referenced, '%s' at %L has ambiguous "
6838 "interfaces", sym->name, &sym->declared_at);
6840 if (sym->attr.function
6841 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
6844 if (sym->ts.type == BT_CHARACTER)
6846 gfc_charlen *cl = sym->ts.cl;
6848 if (cl && cl->length && gfc_is_constant_expr (cl->length)
6849 && resolve_charlen (cl) == FAILURE)
6852 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
6854 if (sym->attr.proc == PROC_ST_FUNCTION)
6856 gfc_error ("Character-valued statement function '%s' at %L must "
6857 "have constant length", sym->name, &sym->declared_at);
6861 if (sym->attr.external && sym->formal == NULL
6862 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
6864 gfc_error ("Automatic character length function '%s' at %L must "
6865 "have an explicit interface", sym->name,
6872 /* Ensure that derived type for are not of a private type. Internal
6873 module procedures are excluded by 2.2.3.3 - ie. they are not
6874 externally accessible and can access all the objects accessible in
6876 if (!(sym->ns->parent
6877 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
6878 && gfc_check_access(sym->attr.access, sym->ns->default_access))
6880 gfc_interface *iface;
6882 for (arg = sym->formal; arg; arg = arg->next)
6885 && arg->sym->ts.type == BT_DERIVED
6886 && !arg->sym->ts.derived->attr.use_assoc
6887 && !gfc_check_access (arg->sym->ts.derived->attr.access,
6888 arg->sym->ts.derived->ns->default_access))
6890 gfc_error_now ("'%s' is of a PRIVATE type and cannot be "
6891 "a dummy argument of '%s', which is "
6892 "PUBLIC at %L", arg->sym->name, sym->name,
6894 /* Stop this message from recurring. */
6895 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
6900 /* PUBLIC interfaces may expose PRIVATE procedures that take types
6901 PRIVATE to the containing module. */
6902 for (iface = sym->generic; iface; iface = iface->next)
6904 for (arg = iface->sym->formal; arg; arg = arg->next)
6907 && arg->sym->ts.type == BT_DERIVED
6908 && !arg->sym->ts.derived->attr.use_assoc
6909 && !gfc_check_access (arg->sym->ts.derived->attr.access,
6910 arg->sym->ts.derived->ns->default_access))
6912 gfc_error_now ("Procedure '%s' in PUBLIC interface '%s' at %L takes "
6913 "dummy arguments of '%s' which is PRIVATE",
6914 iface->sym->name, sym->name, &iface->sym->declared_at,
6915 gfc_typename(&arg->sym->ts));
6916 /* Stop this message from recurring. */
6917 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
6923 /* PUBLIC interfaces may expose PRIVATE procedures that take types
6924 PRIVATE to the containing module. */
6925 for (iface = sym->generic; iface; iface = iface->next)
6927 for (arg = iface->sym->formal; arg; arg = arg->next)
6930 && arg->sym->ts.type == BT_DERIVED
6931 && !arg->sym->ts.derived->attr.use_assoc
6932 && !gfc_check_access (arg->sym->ts.derived->attr.access,
6933 arg->sym->ts.derived->ns->default_access))
6935 gfc_error_now ("Procedure '%s' in PUBLIC interface '%s' at %L takes "
6936 "dummy arguments of '%s' which is PRIVATE",
6937 iface->sym->name, sym->name, &iface->sym->declared_at,
6938 gfc_typename(&arg->sym->ts));
6939 /* Stop this message from recurring. */
6940 arg->sym->ts.derived->attr.access = ACCESS_PUBLIC;
6947 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION)
6949 gfc_error ("Function '%s' at %L cannot have an initializer",
6950 sym->name, &sym->declared_at);
6954 /* An external symbol may not have an initializer because it is taken to be
6956 if (sym->attr.external && sym->value)
6958 gfc_error ("External object '%s' at %L may not have an initializer",
6959 sym->name, &sym->declared_at);
6963 /* An elemental function is required to return a scalar 12.7.1 */
6964 if (sym->attr.elemental && sym->attr.function && sym->as)
6966 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
6967 "result", sym->name, &sym->declared_at);
6968 /* Reset so that the error only occurs once. */
6969 sym->attr.elemental = 0;
6973 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
6974 char-len-param shall not be array-valued, pointer-valued, recursive
6975 or pure. ....snip... A character value of * may only be used in the
6976 following ways: (i) Dummy arg of procedure - dummy associates with
6977 actual length; (ii) To declare a named constant; or (iii) External
6978 function - but length must be declared in calling scoping unit. */
6979 if (sym->attr.function
6980 && sym->ts.type == BT_CHARACTER
6981 && sym->ts.cl && sym->ts.cl->length == NULL)
6983 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
6984 || (sym->attr.recursive) || (sym->attr.pure))
6986 if (sym->as && sym->as->rank)
6987 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
6988 "array-valued", sym->name, &sym->declared_at);
6990 if (sym->attr.pointer)
6991 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
6992 "pointer-valued", sym->name, &sym->declared_at);
6995 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
6996 "pure", sym->name, &sym->declared_at);
6998 if (sym->attr.recursive)
6999 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
7000 "recursive", sym->name, &sym->declared_at);
7005 /* Appendix B.2 of the standard. Contained functions give an
7006 error anyway. Fixed-form is likely to be F77/legacy. */
7007 if (!sym->attr.contained && gfc_current_form != FORM_FIXED)
7008 gfc_notify_std (GFC_STD_F95_OBS, "CHARACTER(*) function "
7009 "'%s' at %L is obsolescent in fortran 95",
7010 sym->name, &sym->declared_at);
7013 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
7015 gfc_formal_arglist *curr_arg;
7016 int has_non_interop_arg = 0;
7018 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
7019 sym->common_block) == FAILURE)
7021 /* Clear these to prevent looking at them again if there was an
7023 sym->attr.is_bind_c = 0;
7024 sym->attr.is_c_interop = 0;
7025 sym->ts.is_c_interop = 0;
7029 /* So far, no errors have been found. */
7030 sym->attr.is_c_interop = 1;
7031 sym->ts.is_c_interop = 1;
7034 curr_arg = sym->formal;
7035 while (curr_arg != NULL)
7037 /* Skip implicitly typed dummy args here. */
7038 if (curr_arg->sym->attr.implicit_type == 0)
7039 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
7040 /* If something is found to fail, record the fact so we
7041 can mark the symbol for the procedure as not being
7042 BIND(C) to try and prevent multiple errors being
7044 has_non_interop_arg = 1;
7046 curr_arg = curr_arg->next;
7049 /* See if any of the arguments were not interoperable and if so, clear
7050 the procedure symbol to prevent duplicate error messages. */
7051 if (has_non_interop_arg != 0)
7053 sym->attr.is_c_interop = 0;
7054 sym->ts.is_c_interop = 0;
7055 sym->attr.is_bind_c = 0;
7063 /* Resolve the components of a derived type. */
7066 resolve_fl_derived (gfc_symbol *sym)
7069 gfc_dt_list * dt_list;
7072 for (c = sym->components; c != NULL; c = c->next)
7074 if (c->ts.type == BT_CHARACTER)
7076 if (c->ts.cl->length == NULL
7077 || (resolve_charlen (c->ts.cl) == FAILURE)
7078 || !gfc_is_constant_expr (c->ts.cl->length))
7080 gfc_error ("Character length of component '%s' needs to "
7081 "be a constant specification expression at %L",
7083 c->ts.cl->length ? &c->ts.cl->length->where : &c->loc);
7088 if (c->ts.type == BT_DERIVED
7089 && sym->component_access != ACCESS_PRIVATE
7090 && gfc_check_access (sym->attr.access, sym->ns->default_access)
7091 && !c->ts.derived->attr.use_assoc
7092 && !gfc_check_access (c->ts.derived->attr.access,
7093 c->ts.derived->ns->default_access))
7095 gfc_error ("The component '%s' is a PRIVATE type and cannot be "
7096 "a component of '%s', which is PUBLIC at %L",
7097 c->name, sym->name, &sym->declared_at);
7101 if (sym->attr.sequence)
7103 if (c->ts.type == BT_DERIVED && c->ts.derived->attr.sequence == 0)
7105 gfc_error ("Component %s of SEQUENCE type declared at %L does "
7106 "not have the SEQUENCE attribute",
7107 c->ts.derived->name, &sym->declared_at);
7112 if (c->ts.type == BT_DERIVED && c->pointer
7113 && c->ts.derived->components == NULL)
7115 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
7116 "that has not been declared", c->name, sym->name,
7121 if (c->pointer || c->allocatable || c->as == NULL)
7124 for (i = 0; i < c->as->rank; i++)
7126 if (c->as->lower[i] == NULL
7127 || !gfc_is_constant_expr (c->as->lower[i])
7128 || (resolve_index_expr (c->as->lower[i]) == FAILURE)
7129 || c->as->upper[i] == NULL
7130 || (resolve_index_expr (c->as->upper[i]) == FAILURE)
7131 || !gfc_is_constant_expr (c->as->upper[i]))
7133 gfc_error ("Component '%s' of '%s' at %L must have "
7134 "constant array bounds",
7135 c->name, sym->name, &c->loc);
7141 /* Add derived type to the derived type list. */
7142 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
7143 if (sym == dt_list->derived)
7146 if (dt_list == NULL)
7148 dt_list = gfc_get_dt_list ();
7149 dt_list->next = gfc_derived_types;
7150 dt_list->derived = sym;
7151 gfc_derived_types = dt_list;
7159 resolve_fl_namelist (gfc_symbol *sym)
7164 /* Reject PRIVATE objects in a PUBLIC namelist. */
7165 if (gfc_check_access(sym->attr.access, sym->ns->default_access))
7167 for (nl = sym->namelist; nl; nl = nl->next)
7169 if (!nl->sym->attr.use_assoc
7170 && !(sym->ns->parent == nl->sym->ns)
7171 && !(sym->ns->parent
7172 && sym->ns->parent->parent == nl->sym->ns)
7173 && !gfc_check_access(nl->sym->attr.access,
7174 nl->sym->ns->default_access))
7176 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
7177 "cannot be member of PUBLIC namelist '%s' at %L",
7178 nl->sym->name, sym->name, &sym->declared_at);
7182 /* Types with private components that came here by USE-association. */
7183 if (nl->sym->ts.type == BT_DERIVED
7184 && derived_inaccessible (nl->sym->ts.derived))
7186 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
7187 "components and cannot be member of namelist '%s' at %L",
7188 nl->sym->name, sym->name, &sym->declared_at);
7192 /* Types with private components that are defined in the same module. */
7193 if (nl->sym->ts.type == BT_DERIVED
7194 && !(sym->ns->parent == nl->sym->ts.derived->ns)
7195 && !gfc_check_access (nl->sym->ts.derived->attr.private_comp
7196 ? ACCESS_PRIVATE : ACCESS_UNKNOWN,
7197 nl->sym->ns->default_access))
7199 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
7200 "cannot be a member of PUBLIC namelist '%s' at %L",
7201 nl->sym->name, sym->name, &sym->declared_at);
7207 for (nl = sym->namelist; nl; nl = nl->next)
7209 /* Reject namelist arrays of assumed shape. */
7210 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
7211 && gfc_notify_std (GFC_STD_F2003, "NAMELIST array object '%s' "
7212 "must not have assumed shape in namelist "
7213 "'%s' at %L", nl->sym->name, sym->name,
7214 &sym->declared_at) == FAILURE)
7217 /* Reject namelist arrays that are not constant shape. */
7218 if (is_non_constant_shape_array (nl->sym))
7220 gfc_error ("NAMELIST array object '%s' must have constant "
7221 "shape in namelist '%s' at %L", nl->sym->name,
7222 sym->name, &sym->declared_at);
7226 /* Namelist objects cannot have allocatable or pointer components. */
7227 if (nl->sym->ts.type != BT_DERIVED)
7230 if (nl->sym->ts.derived->attr.alloc_comp)
7232 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
7233 "have ALLOCATABLE components",
7234 nl->sym->name, sym->name, &sym->declared_at);
7238 if (nl->sym->ts.derived->attr.pointer_comp)
7240 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L cannot "
7241 "have POINTER components",
7242 nl->sym->name, sym->name, &sym->declared_at);
7248 /* 14.1.2 A module or internal procedure represent local entities
7249 of the same type as a namelist member and so are not allowed. */
7250 for (nl = sym->namelist; nl; nl = nl->next)
7252 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
7255 if (nl->sym->attr.function && nl->sym == nl->sym->result)
7256 if ((nl->sym == sym->ns->proc_name)
7258 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
7262 if (nl->sym && nl->sym->name)
7263 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
7264 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
7266 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
7267 "attribute in '%s' at %L", nlsym->name,
7278 resolve_fl_parameter (gfc_symbol *sym)
7280 /* A parameter array's shape needs to be constant. */
7282 && (sym->as->type == AS_DEFERRED
7283 || is_non_constant_shape_array (sym)))
7285 gfc_error ("Parameter array '%s' at %L cannot be automatic "
7286 "or of deferred shape", sym->name, &sym->declared_at);
7290 /* Make sure a parameter that has been implicitly typed still
7291 matches the implicit type, since PARAMETER statements can precede
7292 IMPLICIT statements. */
7293 if (sym->attr.implicit_type
7294 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym, sym->ns)))
7296 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
7297 "later IMPLICIT type", sym->name, &sym->declared_at);
7301 /* Make sure the types of derived parameters are consistent. This
7302 type checking is deferred until resolution because the type may
7303 refer to a derived type from the host. */
7304 if (sym->ts.type == BT_DERIVED
7305 && !gfc_compare_types (&sym->ts, &sym->value->ts))
7307 gfc_error ("Incompatible derived type in PARAMETER at %L",
7308 &sym->value->where);
7315 /* Do anything necessary to resolve a symbol. Right now, we just
7316 assume that an otherwise unknown symbol is a variable. This sort
7317 of thing commonly happens for symbols in module. */
7320 resolve_symbol (gfc_symbol *sym)
7322 int check_constant, mp_flag;
7323 gfc_symtree *symtree;
7324 gfc_symtree *this_symtree;
7328 if (sym->attr.flavor == FL_UNKNOWN)
7331 /* If we find that a flavorless symbol is an interface in one of the
7332 parent namespaces, find its symtree in this namespace, free the
7333 symbol and set the symtree to point to the interface symbol. */
7334 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
7336 symtree = gfc_find_symtree (ns->sym_root, sym->name);
7337 if (symtree && symtree->n.sym->generic)
7339 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
7343 gfc_free_symbol (sym);
7344 symtree->n.sym->refs++;
7345 this_symtree->n.sym = symtree->n.sym;
7350 /* Otherwise give it a flavor according to such attributes as
7352 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
7353 sym->attr.flavor = FL_VARIABLE;
7356 sym->attr.flavor = FL_PROCEDURE;
7357 if (sym->attr.dimension)
7358 sym->attr.function = 1;
7362 if (sym->attr.procedure && sym->interface
7363 && sym->attr.if_source != IFSRC_DECL)
7365 /* Get the attributes from the interface (now resolved). */
7366 if (sym->interface->attr.if_source || sym->interface->attr.intrinsic)
7368 sym->ts = sym->interface->ts;
7369 sym->attr.function = sym->interface->attr.function;
7370 sym->attr.subroutine = sym->interface->attr.subroutine;
7371 copy_formal_args (sym, sym->interface);
7373 else if (sym->interface->name[0] != '\0')
7375 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
7376 sym->interface->name, sym->name, &sym->declared_at);
7381 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
7384 /* Symbols that are module procedures with results (functions) have
7385 the types and array specification copied for type checking in
7386 procedures that call them, as well as for saving to a module
7387 file. These symbols can't stand the scrutiny that their results
7389 mp_flag = (sym->result != NULL && sym->result != sym);
7392 /* Make sure that the intrinsic is consistent with its internal
7393 representation. This needs to be done before assigning a default
7394 type to avoid spurious warnings. */
7395 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic)
7397 if (gfc_intrinsic_name (sym->name, 0))
7399 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising)
7400 gfc_warning ("Type specified for intrinsic function '%s' at %L is ignored",
7401 sym->name, &sym->declared_at);
7403 else if (gfc_intrinsic_name (sym->name, 1))
7405 if (sym->ts.type != BT_UNKNOWN)
7407 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type specifier",
7408 sym->name, &sym->declared_at);
7414 gfc_error ("Intrinsic '%s' at %L does not exist", sym->name, &sym->declared_at);
7419 /* Assign default type to symbols that need one and don't have one. */
7420 if (sym->ts.type == BT_UNKNOWN)
7422 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
7423 gfc_set_default_type (sym, 1, NULL);
7425 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
7427 /* The specific case of an external procedure should emit an error
7428 in the case that there is no implicit type. */
7430 gfc_set_default_type (sym, sym->attr.external, NULL);
7433 /* Result may be in another namespace. */
7434 resolve_symbol (sym->result);
7436 sym->ts = sym->result->ts;
7437 sym->as = gfc_copy_array_spec (sym->result->as);
7438 sym->attr.dimension = sym->result->attr.dimension;
7439 sym->attr.pointer = sym->result->attr.pointer;
7440 sym->attr.allocatable = sym->result->attr.allocatable;
7445 /* Assumed size arrays and assumed shape arrays must be dummy
7449 && (sym->as->type == AS_ASSUMED_SIZE
7450 || sym->as->type == AS_ASSUMED_SHAPE)
7451 && sym->attr.dummy == 0)
7453 if (sym->as->type == AS_ASSUMED_SIZE)
7454 gfc_error ("Assumed size array at %L must be a dummy argument",
7457 gfc_error ("Assumed shape array at %L must be a dummy argument",
7462 /* Make sure symbols with known intent or optional are really dummy
7463 variable. Because of ENTRY statement, this has to be deferred
7464 until resolution time. */
7466 if (!sym->attr.dummy
7467 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
7469 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
7473 if (sym->attr.value && !sym->attr.dummy)
7475 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
7476 "it is not a dummy argument", sym->name, &sym->declared_at);
7480 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
7482 gfc_charlen *cl = sym->ts.cl;
7483 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
7485 gfc_error ("Character dummy variable '%s' at %L with VALUE "
7486 "attribute must have constant length",
7487 sym->name, &sym->declared_at);
7491 if (sym->ts.is_c_interop
7492 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
7494 gfc_error ("C interoperable character dummy variable '%s' at %L "
7495 "with VALUE attribute must have length one",
7496 sym->name, &sym->declared_at);
7501 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
7502 do this for something that was implicitly typed because that is handled
7503 in gfc_set_default_type. Handle dummy arguments and procedure
7504 definitions separately. Also, anything that is use associated is not
7505 handled here but instead is handled in the module it is declared in.
7506 Finally, derived type definitions are allowed to be BIND(C) since that
7507 only implies that they're interoperable, and they are checked fully for
7508 interoperability when a variable is declared of that type. */
7509 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
7510 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
7511 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
7515 /* First, make sure the variable is declared at the
7516 module-level scope (J3/04-007, Section 15.3). */
7517 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
7518 sym->attr.in_common == 0)
7520 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
7521 "is neither a COMMON block nor declared at the "
7522 "module level scope", sym->name, &(sym->declared_at));
7525 else if (sym->common_head != NULL)
7527 t = verify_com_block_vars_c_interop (sym->common_head);
7531 /* If type() declaration, we need to verify that the components
7532 of the given type are all C interoperable, etc. */
7533 if (sym->ts.type == BT_DERIVED &&
7534 sym->ts.derived->attr.is_c_interop != 1)
7536 /* Make sure the user marked the derived type as BIND(C). If
7537 not, call the verify routine. This could print an error
7538 for the derived type more than once if multiple variables
7539 of that type are declared. */
7540 if (sym->ts.derived->attr.is_bind_c != 1)
7541 verify_bind_c_derived_type (sym->ts.derived);
7545 /* Verify the variable itself as C interoperable if it
7546 is BIND(C). It is not possible for this to succeed if
7547 the verify_bind_c_derived_type failed, so don't have to handle
7548 any error returned by verify_bind_c_derived_type. */
7549 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
7555 /* clear the is_bind_c flag to prevent reporting errors more than
7556 once if something failed. */
7557 sym->attr.is_bind_c = 0;
7562 /* If a derived type symbol has reached this point, without its
7563 type being declared, we have an error. Notice that most
7564 conditions that produce undefined derived types have already
7565 been dealt with. However, the likes of:
7566 implicit type(t) (t) ..... call foo (t) will get us here if
7567 the type is not declared in the scope of the implicit
7568 statement. Change the type to BT_UNKNOWN, both because it is so
7569 and to prevent an ICE. */
7570 if (sym->ts.type == BT_DERIVED && sym->ts.derived->components == NULL)
7572 gfc_error ("The derived type '%s' at %L is of type '%s', "
7573 "which has not been defined", sym->name,
7574 &sym->declared_at, sym->ts.derived->name);
7575 sym->ts.type = BT_UNKNOWN;
7579 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
7580 default initialization is defined (5.1.2.4.4). */
7581 if (sym->ts.type == BT_DERIVED
7583 && sym->attr.intent == INTENT_OUT
7585 && sym->as->type == AS_ASSUMED_SIZE)
7587 for (c = sym->ts.derived->components; c; c = c->next)
7591 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
7592 "ASSUMED SIZE and so cannot have a default initializer",
7593 sym->name, &sym->declared_at);
7599 switch (sym->attr.flavor)
7602 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
7607 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
7612 if (resolve_fl_namelist (sym) == FAILURE)
7617 if (resolve_fl_parameter (sym) == FAILURE)
7625 /* Resolve array specifier. Check as well some constraints
7626 on COMMON blocks. */
7628 check_constant = sym->attr.in_common && !sym->attr.pointer;
7630 /* Set the formal_arg_flag so that check_conflict will not throw
7631 an error for host associated variables in the specification
7632 expression for an array_valued function. */
7633 if (sym->attr.function && sym->as)
7634 formal_arg_flag = 1;
7636 gfc_resolve_array_spec (sym->as, check_constant);
7638 formal_arg_flag = 0;
7640 /* Resolve formal namespaces. */
7641 if (sym->formal_ns && sym->formal_ns != gfc_current_ns)
7642 gfc_resolve (sym->formal_ns);
7644 /* Check threadprivate restrictions. */
7645 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
7646 && (!sym->attr.in_common
7647 && sym->module == NULL
7648 && (sym->ns->proc_name == NULL
7649 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
7650 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
7652 /* If we have come this far we can apply default-initializers, as
7653 described in 14.7.5, to those variables that have not already
7654 been assigned one. */
7655 if (sym->ts.type == BT_DERIVED
7656 && sym->attr.referenced
7657 && sym->ns == gfc_current_ns
7659 && !sym->attr.allocatable
7660 && !sym->attr.alloc_comp)
7662 symbol_attribute *a = &sym->attr;
7664 if ((!a->save && !a->dummy && !a->pointer
7665 && !a->in_common && !a->use_assoc
7666 && !(a->function && sym != sym->result))
7667 || (a->dummy && a->intent == INTENT_OUT))
7668 apply_default_init (sym);
7673 /************* Resolve DATA statements *************/
7677 gfc_data_value *vnode;
7683 /* Advance the values structure to point to the next value in the data list. */
7686 next_data_value (void)
7688 while (values.left == 0)
7690 if (values.vnode->next == NULL)
7693 values.vnode = values.vnode->next;
7694 values.left = values.vnode->repeat;
7702 check_data_variable (gfc_data_variable *var, locus *where)
7708 ar_type mark = AR_UNKNOWN;
7710 mpz_t section_index[GFC_MAX_DIMENSIONS];
7714 if (gfc_resolve_expr (var->expr) == FAILURE)
7718 mpz_init_set_si (offset, 0);
7721 if (e->expr_type != EXPR_VARIABLE)
7722 gfc_internal_error ("check_data_variable(): Bad expression");
7724 if (e->symtree->n.sym->ns->is_block_data
7725 && !e->symtree->n.sym->attr.in_common)
7727 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
7728 e->symtree->n.sym->name, &e->symtree->n.sym->declared_at);
7733 mpz_init_set_ui (size, 1);
7740 /* Find the array section reference. */
7741 for (ref = e->ref; ref; ref = ref->next)
7743 if (ref->type != REF_ARRAY)
7745 if (ref->u.ar.type == AR_ELEMENT)
7751 /* Set marks according to the reference pattern. */
7752 switch (ref->u.ar.type)
7760 /* Get the start position of array section. */
7761 gfc_get_section_index (ar, section_index, &offset);
7769 if (gfc_array_size (e, &size) == FAILURE)
7771 gfc_error ("Nonconstant array section at %L in DATA statement",
7780 while (mpz_cmp_ui (size, 0) > 0)
7782 if (next_data_value () == FAILURE)
7784 gfc_error ("DATA statement at %L has more variables than values",
7790 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
7794 /* If we have more than one element left in the repeat count,
7795 and we have more than one element left in the target variable,
7796 then create a range assignment. */
7797 /* ??? Only done for full arrays for now, since array sections
7799 if (mark == AR_FULL && ref && ref->next == NULL
7800 && values.left > 1 && mpz_cmp_ui (size, 1) > 0)
7804 if (mpz_cmp_ui (size, values.left) >= 0)
7806 mpz_init_set_ui (range, values.left);
7807 mpz_sub_ui (size, size, values.left);
7812 mpz_init_set (range, size);
7813 values.left -= mpz_get_ui (size);
7814 mpz_set_ui (size, 0);
7817 gfc_assign_data_value_range (var->expr, values.vnode->expr,
7820 mpz_add (offset, offset, range);
7824 /* Assign initial value to symbol. */
7828 mpz_sub_ui (size, size, 1);
7830 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
7834 if (mark == AR_FULL)
7835 mpz_add_ui (offset, offset, 1);
7837 /* Modify the array section indexes and recalculate the offset
7838 for next element. */
7839 else if (mark == AR_SECTION)
7840 gfc_advance_section (section_index, ar, &offset);
7844 if (mark == AR_SECTION)
7846 for (i = 0; i < ar->dimen; i++)
7847 mpz_clear (section_index[i]);
7857 static try traverse_data_var (gfc_data_variable *, locus *);
7859 /* Iterate over a list of elements in a DATA statement. */
7862 traverse_data_list (gfc_data_variable *var, locus *where)
7865 iterator_stack frame;
7866 gfc_expr *e, *start, *end, *step;
7867 try retval = SUCCESS;
7869 mpz_init (frame.value);
7871 start = gfc_copy_expr (var->iter.start);
7872 end = gfc_copy_expr (var->iter.end);
7873 step = gfc_copy_expr (var->iter.step);
7875 if (gfc_simplify_expr (start, 1) == FAILURE
7876 || start->expr_type != EXPR_CONSTANT)
7878 gfc_error ("iterator start at %L does not simplify", &start->where);
7882 if (gfc_simplify_expr (end, 1) == FAILURE
7883 || end->expr_type != EXPR_CONSTANT)
7885 gfc_error ("iterator end at %L does not simplify", &end->where);
7889 if (gfc_simplify_expr (step, 1) == FAILURE
7890 || step->expr_type != EXPR_CONSTANT)
7892 gfc_error ("iterator step at %L does not simplify", &step->where);
7897 mpz_init_set (trip, end->value.integer);
7898 mpz_sub (trip, trip, start->value.integer);
7899 mpz_add (trip, trip, step->value.integer);
7901 mpz_div (trip, trip, step->value.integer);
7903 mpz_set (frame.value, start->value.integer);
7905 frame.prev = iter_stack;
7906 frame.variable = var->iter.var->symtree;
7907 iter_stack = &frame;
7909 while (mpz_cmp_ui (trip, 0) > 0)
7911 if (traverse_data_var (var->list, where) == FAILURE)
7918 e = gfc_copy_expr (var->expr);
7919 if (gfc_simplify_expr (e, 1) == FAILURE)
7927 mpz_add (frame.value, frame.value, step->value.integer);
7929 mpz_sub_ui (trip, trip, 1);
7934 mpz_clear (frame.value);
7936 gfc_free_expr (start);
7937 gfc_free_expr (end);
7938 gfc_free_expr (step);
7940 iter_stack = frame.prev;
7945 /* Type resolve variables in the variable list of a DATA statement. */
7948 traverse_data_var (gfc_data_variable *var, locus *where)
7952 for (; var; var = var->next)
7954 if (var->expr == NULL)
7955 t = traverse_data_list (var, where);
7957 t = check_data_variable (var, where);
7967 /* Resolve the expressions and iterators associated with a data statement.
7968 This is separate from the assignment checking because data lists should
7969 only be resolved once. */
7972 resolve_data_variables (gfc_data_variable *d)
7974 for (; d; d = d->next)
7976 if (d->list == NULL)
7978 if (gfc_resolve_expr (d->expr) == FAILURE)
7983 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
7986 if (resolve_data_variables (d->list) == FAILURE)
7995 /* Resolve a single DATA statement. We implement this by storing a pointer to
7996 the value list into static variables, and then recursively traversing the
7997 variables list, expanding iterators and such. */
8000 resolve_data (gfc_data * d)
8002 if (resolve_data_variables (d->var) == FAILURE)
8005 values.vnode = d->value;
8006 values.left = (d->value == NULL) ? 0 : d->value->repeat;
8008 if (traverse_data_var (d->var, &d->where) == FAILURE)
8011 /* At this point, we better not have any values left. */
8013 if (next_data_value () == SUCCESS)
8014 gfc_error ("DATA statement at %L has more values than variables",
8019 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
8020 accessed by host or use association, is a dummy argument to a pure function,
8021 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
8022 is storage associated with any such variable, shall not be used in the
8023 following contexts: (clients of this function). */
8025 /* Determines if a variable is not 'pure', ie not assignable within a pure
8026 procedure. Returns zero if assignment is OK, nonzero if there is a
8029 gfc_impure_variable (gfc_symbol *sym)
8033 if (sym->attr.use_assoc || sym->attr.in_common)
8036 if (sym->ns != gfc_current_ns)
8037 return !sym->attr.function;
8039 proc = sym->ns->proc_name;
8040 if (sym->attr.dummy && gfc_pure (proc)
8041 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
8043 proc->attr.function))
8046 /* TODO: Sort out what can be storage associated, if anything, and include
8047 it here. In principle equivalences should be scanned but it does not
8048 seem to be possible to storage associate an impure variable this way. */
8053 /* Test whether a symbol is pure or not. For a NULL pointer, checks the
8054 symbol of the current procedure. */
8057 gfc_pure (gfc_symbol *sym)
8059 symbol_attribute attr;
8062 sym = gfc_current_ns->proc_name;
8068 return attr.flavor == FL_PROCEDURE && (attr.pure || attr.elemental);
8072 /* Test whether the current procedure is elemental or not. */
8075 gfc_elemental (gfc_symbol *sym)
8077 symbol_attribute attr;
8080 sym = gfc_current_ns->proc_name;
8085 return attr.flavor == FL_PROCEDURE && attr.elemental;
8089 /* Warn about unused labels. */
8092 warn_unused_fortran_label (gfc_st_label *label)
8097 warn_unused_fortran_label (label->left);
8099 if (label->defined == ST_LABEL_UNKNOWN)
8102 switch (label->referenced)
8104 case ST_LABEL_UNKNOWN:
8105 gfc_warning ("Label %d at %L defined but not used", label->value,
8109 case ST_LABEL_BAD_TARGET:
8110 gfc_warning ("Label %d at %L defined but cannot be used",
8111 label->value, &label->where);
8118 warn_unused_fortran_label (label->right);
8122 /* Returns the sequence type of a symbol or sequence. */
8125 sequence_type (gfc_typespec ts)
8134 if (ts.derived->components == NULL)
8135 return SEQ_NONDEFAULT;
8137 result = sequence_type (ts.derived->components->ts);
8138 for (c = ts.derived->components->next; c; c = c->next)
8139 if (sequence_type (c->ts) != result)
8145 if (ts.kind != gfc_default_character_kind)
8146 return SEQ_NONDEFAULT;
8148 return SEQ_CHARACTER;
8151 if (ts.kind != gfc_default_integer_kind)
8152 return SEQ_NONDEFAULT;
8157 if (!(ts.kind == gfc_default_real_kind
8158 || ts.kind == gfc_default_double_kind))
8159 return SEQ_NONDEFAULT;
8164 if (ts.kind != gfc_default_complex_kind)
8165 return SEQ_NONDEFAULT;
8170 if (ts.kind != gfc_default_logical_kind)
8171 return SEQ_NONDEFAULT;
8176 return SEQ_NONDEFAULT;
8181 /* Resolve derived type EQUIVALENCE object. */
8184 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
8187 gfc_component *c = derived->components;
8192 /* Shall not be an object of nonsequence derived type. */
8193 if (!derived->attr.sequence)
8195 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
8196 "attribute to be an EQUIVALENCE object", sym->name,
8201 /* Shall not have allocatable components. */
8202 if (derived->attr.alloc_comp)
8204 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
8205 "components to be an EQUIVALENCE object",sym->name,
8210 for (; c ; c = c->next)
8214 && (resolve_equivalence_derived (c->ts.derived, sym, e) == FAILURE))
8217 /* Shall not be an object of sequence derived type containing a pointer
8218 in the structure. */
8221 gfc_error ("Derived type variable '%s' at %L with pointer "
8222 "component(s) cannot be an EQUIVALENCE object",
8223 sym->name, &e->where);
8231 /* Resolve equivalence object.
8232 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
8233 an allocatable array, an object of nonsequence derived type, an object of
8234 sequence derived type containing a pointer at any level of component
8235 selection, an automatic object, a function name, an entry name, a result
8236 name, a named constant, a structure component, or a subobject of any of
8237 the preceding objects. A substring shall not have length zero. A
8238 derived type shall not have components with default initialization nor
8239 shall two objects of an equivalence group be initialized.
8240 Either all or none of the objects shall have an protected attribute.
8241 The simple constraints are done in symbol.c(check_conflict) and the rest
8242 are implemented here. */
8245 resolve_equivalence (gfc_equiv *eq)
8248 gfc_symbol *derived;
8249 gfc_symbol *first_sym;
8252 locus *last_where = NULL;
8253 seq_type eq_type, last_eq_type;
8254 gfc_typespec *last_ts;
8255 int object, cnt_protected;
8256 const char *value_name;
8260 last_ts = &eq->expr->symtree->n.sym->ts;
8262 first_sym = eq->expr->symtree->n.sym;
8266 for (object = 1; eq; eq = eq->eq, object++)
8270 e->ts = e->symtree->n.sym->ts;
8271 /* match_varspec might not know yet if it is seeing
8272 array reference or substring reference, as it doesn't
8274 if (e->ref && e->ref->type == REF_ARRAY)
8276 gfc_ref *ref = e->ref;
8277 sym = e->symtree->n.sym;
8279 if (sym->attr.dimension)
8281 ref->u.ar.as = sym->as;
8285 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
8286 if (e->ts.type == BT_CHARACTER
8288 && ref->type == REF_ARRAY
8289 && ref->u.ar.dimen == 1
8290 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
8291 && ref->u.ar.stride[0] == NULL)
8293 gfc_expr *start = ref->u.ar.start[0];
8294 gfc_expr *end = ref->u.ar.end[0];
8297 /* Optimize away the (:) reference. */
8298 if (start == NULL && end == NULL)
8303 e->ref->next = ref->next;
8308 ref->type = REF_SUBSTRING;
8310 start = gfc_int_expr (1);
8311 ref->u.ss.start = start;
8312 if (end == NULL && e->ts.cl)
8313 end = gfc_copy_expr (e->ts.cl->length);
8314 ref->u.ss.end = end;
8315 ref->u.ss.length = e->ts.cl;
8322 /* Any further ref is an error. */
8325 gcc_assert (ref->type == REF_ARRAY);
8326 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
8332 if (gfc_resolve_expr (e) == FAILURE)
8335 sym = e->symtree->n.sym;
8337 if (sym->attr.protected)
8339 if (cnt_protected > 0 && cnt_protected != object)
8341 gfc_error ("Either all or none of the objects in the "
8342 "EQUIVALENCE set at %L shall have the "
8343 "PROTECTED attribute",
8348 /* Shall not equivalence common block variables in a PURE procedure. */
8349 if (sym->ns->proc_name
8350 && sym->ns->proc_name->attr.pure
8351 && sym->attr.in_common)
8353 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
8354 "object in the pure procedure '%s'",
8355 sym->name, &e->where, sym->ns->proc_name->name);
8359 /* Shall not be a named constant. */
8360 if (e->expr_type == EXPR_CONSTANT)
8362 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
8363 "object", sym->name, &e->where);
8367 derived = e->ts.derived;
8368 if (derived && resolve_equivalence_derived (derived, sym, e) == FAILURE)
8371 /* Check that the types correspond correctly:
8373 A numeric sequence structure may be equivalenced to another sequence
8374 structure, an object of default integer type, default real type, double
8375 precision real type, default logical type such that components of the
8376 structure ultimately only become associated to objects of the same
8377 kind. A character sequence structure may be equivalenced to an object
8378 of default character kind or another character sequence structure.
8379 Other objects may be equivalenced only to objects of the same type and
8382 /* Identical types are unconditionally OK. */
8383 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
8384 goto identical_types;
8386 last_eq_type = sequence_type (*last_ts);
8387 eq_type = sequence_type (sym->ts);
8389 /* Since the pair of objects is not of the same type, mixed or
8390 non-default sequences can be rejected. */
8392 msg = "Sequence %s with mixed components in EQUIVALENCE "
8393 "statement at %L with different type objects";
8395 && last_eq_type == SEQ_MIXED
8396 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
8398 || (eq_type == SEQ_MIXED
8399 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
8400 &e->where) == FAILURE))
8403 msg = "Non-default type object or sequence %s in EQUIVALENCE "
8404 "statement at %L with objects of different type";
8406 && last_eq_type == SEQ_NONDEFAULT
8407 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
8408 last_where) == FAILURE)
8409 || (eq_type == SEQ_NONDEFAULT
8410 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
8411 &e->where) == FAILURE))
8414 msg ="Non-CHARACTER object '%s' in default CHARACTER "
8415 "EQUIVALENCE statement at %L";
8416 if (last_eq_type == SEQ_CHARACTER
8417 && eq_type != SEQ_CHARACTER
8418 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
8419 &e->where) == FAILURE)
8422 msg ="Non-NUMERIC object '%s' in default NUMERIC "
8423 "EQUIVALENCE statement at %L";
8424 if (last_eq_type == SEQ_NUMERIC
8425 && eq_type != SEQ_NUMERIC
8426 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
8427 &e->where) == FAILURE)
8432 last_where = &e->where;
8437 /* Shall not be an automatic array. */
8438 if (e->ref->type == REF_ARRAY
8439 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
8441 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
8442 "an EQUIVALENCE object", sym->name, &e->where);
8449 /* Shall not be a structure component. */
8450 if (r->type == REF_COMPONENT)
8452 gfc_error ("Structure component '%s' at %L cannot be an "
8453 "EQUIVALENCE object",
8454 r->u.c.component->name, &e->where);
8458 /* A substring shall not have length zero. */
8459 if (r->type == REF_SUBSTRING)
8461 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
8463 gfc_error ("Substring at %L has length zero",
8464 &r->u.ss.start->where);
8474 /* Resolve function and ENTRY types, issue diagnostics if needed. */
8477 resolve_fntype (gfc_namespace *ns)
8482 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
8485 /* If there are any entries, ns->proc_name is the entry master
8486 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
8488 sym = ns->entries->sym;
8490 sym = ns->proc_name;
8491 if (sym->result == sym
8492 && sym->ts.type == BT_UNKNOWN
8493 && gfc_set_default_type (sym, 0, NULL) == FAILURE
8494 && !sym->attr.untyped)
8496 gfc_error ("Function '%s' at %L has no IMPLICIT type",
8497 sym->name, &sym->declared_at);
8498 sym->attr.untyped = 1;
8501 if (sym->ts.type == BT_DERIVED && !sym->ts.derived->attr.use_assoc
8502 && !gfc_check_access (sym->ts.derived->attr.access,
8503 sym->ts.derived->ns->default_access)
8504 && gfc_check_access (sym->attr.access, sym->ns->default_access))
8506 gfc_error ("PUBLIC function '%s' at %L cannot be of PRIVATE type '%s'",
8507 sym->name, &sym->declared_at, sym->ts.derived->name);
8511 for (el = ns->entries->next; el; el = el->next)
8513 if (el->sym->result == el->sym
8514 && el->sym->ts.type == BT_UNKNOWN
8515 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
8516 && !el->sym->attr.untyped)
8518 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
8519 el->sym->name, &el->sym->declared_at);
8520 el->sym->attr.untyped = 1;
8525 /* 12.3.2.1.1 Defined operators. */
8528 gfc_resolve_uops (gfc_symtree *symtree)
8532 gfc_formal_arglist *formal;
8534 if (symtree == NULL)
8537 gfc_resolve_uops (symtree->left);
8538 gfc_resolve_uops (symtree->right);
8540 for (itr = symtree->n.uop->operator; itr; itr = itr->next)
8543 if (!sym->attr.function)
8544 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
8545 sym->name, &sym->declared_at);
8547 if (sym->ts.type == BT_CHARACTER
8548 && !(sym->ts.cl && sym->ts.cl->length)
8549 && !(sym->result && sym->result->ts.cl
8550 && sym->result->ts.cl->length))
8551 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
8552 "character length", sym->name, &sym->declared_at);
8554 formal = sym->formal;
8555 if (!formal || !formal->sym)
8557 gfc_error ("User operator procedure '%s' at %L must have at least "
8558 "one argument", sym->name, &sym->declared_at);
8562 if (formal->sym->attr.intent != INTENT_IN)
8563 gfc_error ("First argument of operator interface at %L must be "
8564 "INTENT(IN)", &sym->declared_at);
8566 if (formal->sym->attr.optional)
8567 gfc_error ("First argument of operator interface at %L cannot be "
8568 "optional", &sym->declared_at);
8570 formal = formal->next;
8571 if (!formal || !formal->sym)
8574 if (formal->sym->attr.intent != INTENT_IN)
8575 gfc_error ("Second argument of operator interface at %L must be "
8576 "INTENT(IN)", &sym->declared_at);
8578 if (formal->sym->attr.optional)
8579 gfc_error ("Second argument of operator interface at %L cannot be "
8580 "optional", &sym->declared_at);
8583 gfc_error ("Operator interface at %L must have, at most, two "
8584 "arguments", &sym->declared_at);
8589 /* Examine all of the expressions associated with a program unit,
8590 assign types to all intermediate expressions, make sure that all
8591 assignments are to compatible types and figure out which names
8592 refer to which functions or subroutines. It doesn't check code
8593 block, which is handled by resolve_code. */
8596 resolve_types (gfc_namespace *ns)
8603 gfc_current_ns = ns;
8605 resolve_entries (ns);
8607 resolve_common_blocks (ns->common_root);
8609 resolve_contained_functions (ns);
8611 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
8613 for (cl = ns->cl_list; cl; cl = cl->next)
8614 resolve_charlen (cl);
8616 gfc_traverse_ns (ns, resolve_symbol);
8618 resolve_fntype (ns);
8620 for (n = ns->contained; n; n = n->sibling)
8622 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
8623 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
8624 "also be PURE", n->proc_name->name,
8625 &n->proc_name->declared_at);
8631 gfc_check_interfaces (ns);
8633 gfc_traverse_ns (ns, resolve_values);
8639 for (d = ns->data; d; d = d->next)
8643 gfc_traverse_ns (ns, gfc_formalize_init_value);
8645 gfc_traverse_ns (ns, gfc_verify_binding_labels);
8647 if (ns->common_root != NULL)
8648 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
8650 for (eq = ns->equiv; eq; eq = eq->next)
8651 resolve_equivalence (eq);
8653 /* Warn about unused labels. */
8654 if (warn_unused_label)
8655 warn_unused_fortran_label (ns->st_labels);
8657 gfc_resolve_uops (ns->uop_root);
8661 /* Call resolve_code recursively. */
8664 resolve_codes (gfc_namespace *ns)
8668 for (n = ns->contained; n; n = n->sibling)
8671 gfc_current_ns = ns;
8673 /* Set to an out of range value. */
8674 current_entry_id = -1;
8676 bitmap_obstack_initialize (&labels_obstack);
8677 resolve_code (ns->code, ns);
8678 bitmap_obstack_release (&labels_obstack);
8682 /* This function is called after a complete program unit has been compiled.
8683 Its purpose is to examine all of the expressions associated with a program
8684 unit, assign types to all intermediate expressions, make sure that all
8685 assignments are to compatible types and figure out which names refer to
8686 which functions or subroutines. */
8689 gfc_resolve (gfc_namespace *ns)
8691 gfc_namespace *old_ns;
8693 old_ns = gfc_current_ns;
8698 gfc_current_ns = old_ns;