1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
29 #include "arith.h" /* For gfc_compare_expr(). */
30 #include "dependency.h"
32 #include "target-memory.h" /* for gfc_simplify_transfer */
33 #include "constructor.h"
35 /* Types used in equivalence statements. */
39 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
43 /* Stack to keep track of the nesting of blocks as we move through the
44 code. See resolve_branch() and resolve_code(). */
46 typedef struct code_stack
48 struct gfc_code *head, *current;
49 struct code_stack *prev;
51 /* This bitmap keeps track of the targets valid for a branch from
52 inside this block except for END {IF|SELECT}s of enclosing
54 bitmap reachable_labels;
58 static code_stack *cs_base = NULL;
61 /* Nonzero if we're inside a FORALL block. */
63 static int forall_flag;
65 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
67 static int omp_workshare_flag;
69 /* Nonzero if we are processing a formal arglist. The corresponding function
70 resets the flag each time that it is read. */
71 static int formal_arg_flag = 0;
73 /* True if we are resolving a specification expression. */
74 static int specification_expr = 0;
76 /* The id of the last entry seen. */
77 static int current_entry_id;
79 /* We use bitmaps to determine if a branch target is valid. */
80 static bitmap_obstack labels_obstack;
82 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
83 static bool inquiry_argument = false;
86 gfc_is_formal_arg (void)
88 return formal_arg_flag;
91 /* Is the symbol host associated? */
93 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
95 for (ns = ns->parent; ns; ns = ns->parent)
104 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
105 an ABSTRACT derived-type. If where is not NULL, an error message with that
106 locus is printed, optionally using name. */
109 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
111 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
116 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
117 name, where, ts->u.derived->name);
119 gfc_error ("ABSTRACT type '%s' used at %L",
120 ts->u.derived->name, where);
130 static void resolve_symbol (gfc_symbol *sym);
131 static gfc_try resolve_intrinsic (gfc_symbol *sym, locus *loc);
134 /* Resolve the interface for a PROCEDURE declaration or procedure pointer. */
137 resolve_procedure_interface (gfc_symbol *sym)
139 if (sym->ts.interface == sym)
141 gfc_error ("PROCEDURE '%s' at %L may not be used as its own interface",
142 sym->name, &sym->declared_at);
145 if (sym->ts.interface->attr.procedure)
147 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared "
148 "in a later PROCEDURE statement", sym->ts.interface->name,
149 sym->name, &sym->declared_at);
153 /* Get the attributes from the interface (now resolved). */
154 if (sym->ts.interface->attr.if_source || sym->ts.interface->attr.intrinsic)
156 gfc_symbol *ifc = sym->ts.interface;
157 resolve_symbol (ifc);
159 if (ifc->attr.intrinsic)
160 resolve_intrinsic (ifc, &ifc->declared_at);
164 sym->ts = ifc->result->ts;
169 sym->ts.interface = ifc;
170 sym->attr.function = ifc->attr.function;
171 sym->attr.subroutine = ifc->attr.subroutine;
172 gfc_copy_formal_args (sym, ifc);
174 sym->attr.allocatable = ifc->attr.allocatable;
175 sym->attr.pointer = ifc->attr.pointer;
176 sym->attr.pure = ifc->attr.pure;
177 sym->attr.elemental = ifc->attr.elemental;
178 sym->attr.dimension = ifc->attr.dimension;
179 sym->attr.contiguous = ifc->attr.contiguous;
180 sym->attr.recursive = ifc->attr.recursive;
181 sym->attr.always_explicit = ifc->attr.always_explicit;
182 sym->attr.ext_attr |= ifc->attr.ext_attr;
183 sym->attr.is_bind_c = ifc->attr.is_bind_c;
184 /* Copy array spec. */
185 sym->as = gfc_copy_array_spec (ifc->as);
189 for (i = 0; i < sym->as->rank; i++)
191 gfc_expr_replace_symbols (sym->as->lower[i], sym);
192 gfc_expr_replace_symbols (sym->as->upper[i], sym);
195 /* Copy char length. */
196 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
198 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
199 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
200 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
201 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
205 else if (sym->ts.interface->name[0] != '\0')
207 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
208 sym->ts.interface->name, sym->name, &sym->declared_at);
216 /* Resolve types of formal argument lists. These have to be done early so that
217 the formal argument lists of module procedures can be copied to the
218 containing module before the individual procedures are resolved
219 individually. We also resolve argument lists of procedures in interface
220 blocks because they are self-contained scoping units.
222 Since a dummy argument cannot be a non-dummy procedure, the only
223 resort left for untyped names are the IMPLICIT types. */
226 resolve_formal_arglist (gfc_symbol *proc)
228 gfc_formal_arglist *f;
232 if (proc->result != NULL)
237 if (gfc_elemental (proc)
238 || sym->attr.pointer || sym->attr.allocatable
239 || (sym->as && sym->as->rank > 0))
241 proc->attr.always_explicit = 1;
242 sym->attr.always_explicit = 1;
247 for (f = proc->formal; f; f = f->next)
253 /* Alternate return placeholder. */
254 if (gfc_elemental (proc))
255 gfc_error ("Alternate return specifier in elemental subroutine "
256 "'%s' at %L is not allowed", proc->name,
258 if (proc->attr.function)
259 gfc_error ("Alternate return specifier in function "
260 "'%s' at %L is not allowed", proc->name,
264 else if (sym->attr.procedure && sym->ts.interface
265 && sym->attr.if_source != IFSRC_DECL)
266 resolve_procedure_interface (sym);
268 if (sym->attr.if_source != IFSRC_UNKNOWN)
269 resolve_formal_arglist (sym);
271 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
273 if (gfc_pure (proc) && !gfc_pure (sym))
275 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
276 "also be PURE", sym->name, &sym->declared_at);
280 if (proc->attr.implicit_pure && !gfc_pure(sym))
281 proc->attr.implicit_pure = 0;
283 if (gfc_elemental (proc))
285 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
286 "procedure", &sym->declared_at);
290 if (sym->attr.function
291 && sym->ts.type == BT_UNKNOWN
292 && sym->attr.intrinsic)
294 gfc_intrinsic_sym *isym;
295 isym = gfc_find_function (sym->name);
296 if (isym == NULL || !isym->specific)
298 gfc_error ("Unable to find a specific INTRINSIC procedure "
299 "for the reference '%s' at %L", sym->name,
308 if (sym->ts.type == BT_UNKNOWN && !proc->attr.intrinsic
309 && (!sym->attr.function || sym->result == sym))
310 gfc_set_default_type (sym, 1, sym->ns);
312 gfc_resolve_array_spec (sym->as, 0);
314 /* We can't tell if an array with dimension (:) is assumed or deferred
315 shape until we know if it has the pointer or allocatable attributes.
317 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
318 && !(sym->attr.pointer || sym->attr.allocatable)
319 && sym->attr.flavor != FL_PROCEDURE)
321 sym->as->type = AS_ASSUMED_SHAPE;
322 for (i = 0; i < sym->as->rank; i++)
323 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
327 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
328 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
329 || sym->attr.optional)
331 proc->attr.always_explicit = 1;
333 proc->result->attr.always_explicit = 1;
336 /* If the flavor is unknown at this point, it has to be a variable.
337 A procedure specification would have already set the type. */
339 if (sym->attr.flavor == FL_UNKNOWN)
340 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
342 if (gfc_pure (proc) && !sym->attr.pointer
343 && sym->attr.flavor != FL_PROCEDURE)
345 if (proc->attr.function && sym->attr.intent != INTENT_IN)
348 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
349 "of pure function '%s' at %L with VALUE "
350 "attribute but without INTENT(IN)", sym->name,
351 proc->name, &sym->declared_at);
353 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
354 "INTENT(IN) or VALUE", sym->name, proc->name,
358 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
361 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
362 "of pure subroutine '%s' at %L with VALUE "
363 "attribute but without INTENT", sym->name,
364 proc->name, &sym->declared_at);
366 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
367 "have its INTENT specified or have the VALUE "
368 "attribute", sym->name, proc->name, &sym->declared_at);
372 if (proc->attr.implicit_pure && !sym->attr.pointer
373 && sym->attr.flavor != FL_PROCEDURE)
375 if (proc->attr.function && sym->attr.intent != INTENT_IN)
376 proc->attr.implicit_pure = 0;
378 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
379 proc->attr.implicit_pure = 0;
382 if (gfc_elemental (proc))
385 if (sym->attr.codimension)
387 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
388 "procedure", sym->name, &sym->declared_at);
394 gfc_error ("Argument '%s' of elemental procedure at %L must "
395 "be scalar", sym->name, &sym->declared_at);
399 if (sym->attr.allocatable)
401 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
402 "have the ALLOCATABLE attribute", sym->name,
407 if (sym->attr.pointer)
409 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
410 "have the POINTER attribute", sym->name,
415 if (sym->attr.flavor == FL_PROCEDURE)
417 gfc_error ("Dummy procedure '%s' not allowed in elemental "
418 "procedure '%s' at %L", sym->name, proc->name,
423 if (sym->attr.intent == INTENT_UNKNOWN)
425 gfc_error ("Argument '%s' of elemental procedure '%s' at %L must "
426 "have its INTENT specified", sym->name, proc->name,
432 /* Each dummy shall be specified to be scalar. */
433 if (proc->attr.proc == PROC_ST_FUNCTION)
437 gfc_error ("Argument '%s' of statement function at %L must "
438 "be scalar", sym->name, &sym->declared_at);
442 if (sym->ts.type == BT_CHARACTER)
444 gfc_charlen *cl = sym->ts.u.cl;
445 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
447 gfc_error ("Character-valued argument '%s' of statement "
448 "function at %L must have constant length",
449 sym->name, &sym->declared_at);
459 /* Work function called when searching for symbols that have argument lists
460 associated with them. */
463 find_arglists (gfc_symbol *sym)
465 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
468 resolve_formal_arglist (sym);
472 /* Given a namespace, resolve all formal argument lists within the namespace.
476 resolve_formal_arglists (gfc_namespace *ns)
481 gfc_traverse_ns (ns, find_arglists);
486 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
490 /* If this namespace is not a function or an entry master function,
492 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
493 || sym->attr.entry_master)
496 /* Try to find out of what the return type is. */
497 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
499 t = gfc_set_default_type (sym->result, 0, ns);
501 if (t == FAILURE && !sym->result->attr.untyped)
503 if (sym->result == sym)
504 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
505 sym->name, &sym->declared_at);
506 else if (!sym->result->attr.proc_pointer)
507 gfc_error ("Result '%s' of contained function '%s' at %L has "
508 "no IMPLICIT type", sym->result->name, sym->name,
509 &sym->result->declared_at);
510 sym->result->attr.untyped = 1;
514 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
515 type, lists the only ways a character length value of * can be used:
516 dummy arguments of procedures, named constants, and function results
517 in external functions. Internal function results and results of module
518 procedures are not on this list, ergo, not permitted. */
520 if (sym->result->ts.type == BT_CHARACTER)
522 gfc_charlen *cl = sym->result->ts.u.cl;
523 if ((!cl || !cl->length) && !sym->result->ts.deferred)
525 /* See if this is a module-procedure and adapt error message
528 gcc_assert (ns->parent && ns->parent->proc_name);
529 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
531 gfc_error ("Character-valued %s '%s' at %L must not be"
533 module_proc ? _("module procedure")
534 : _("internal function"),
535 sym->name, &sym->declared_at);
541 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
542 introduce duplicates. */
545 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
547 gfc_formal_arglist *f, *new_arglist;
550 for (; new_args != NULL; new_args = new_args->next)
552 new_sym = new_args->sym;
553 /* See if this arg is already in the formal argument list. */
554 for (f = proc->formal; f; f = f->next)
556 if (new_sym == f->sym)
563 /* Add a new argument. Argument order is not important. */
564 new_arglist = gfc_get_formal_arglist ();
565 new_arglist->sym = new_sym;
566 new_arglist->next = proc->formal;
567 proc->formal = new_arglist;
572 /* Flag the arguments that are not present in all entries. */
575 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
577 gfc_formal_arglist *f, *head;
580 for (f = proc->formal; f; f = f->next)
585 for (new_args = head; new_args; new_args = new_args->next)
587 if (new_args->sym == f->sym)
594 f->sym->attr.not_always_present = 1;
599 /* Resolve alternate entry points. If a symbol has multiple entry points we
600 create a new master symbol for the main routine, and turn the existing
601 symbol into an entry point. */
604 resolve_entries (gfc_namespace *ns)
606 gfc_namespace *old_ns;
610 char name[GFC_MAX_SYMBOL_LEN + 1];
611 static int master_count = 0;
613 if (ns->proc_name == NULL)
616 /* No need to do anything if this procedure doesn't have alternate entry
621 /* We may already have resolved alternate entry points. */
622 if (ns->proc_name->attr.entry_master)
625 /* If this isn't a procedure something has gone horribly wrong. */
626 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
628 /* Remember the current namespace. */
629 old_ns = gfc_current_ns;
633 /* Add the main entry point to the list of entry points. */
634 el = gfc_get_entry_list ();
635 el->sym = ns->proc_name;
637 el->next = ns->entries;
639 ns->proc_name->attr.entry = 1;
641 /* If it is a module function, it needs to be in the right namespace
642 so that gfc_get_fake_result_decl can gather up the results. The
643 need for this arose in get_proc_name, where these beasts were
644 left in their own namespace, to keep prior references linked to
645 the entry declaration.*/
646 if (ns->proc_name->attr.function
647 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
650 /* Do the same for entries where the master is not a module
651 procedure. These are retained in the module namespace because
652 of the module procedure declaration. */
653 for (el = el->next; el; el = el->next)
654 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
655 && el->sym->attr.mod_proc)
659 /* Add an entry statement for it. */
666 /* Create a new symbol for the master function. */
667 /* Give the internal function a unique name (within this file).
668 Also include the function name so the user has some hope of figuring
669 out what is going on. */
670 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
671 master_count++, ns->proc_name->name);
672 gfc_get_ha_symbol (name, &proc);
673 gcc_assert (proc != NULL);
675 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
676 if (ns->proc_name->attr.subroutine)
677 gfc_add_subroutine (&proc->attr, proc->name, NULL);
681 gfc_typespec *ts, *fts;
682 gfc_array_spec *as, *fas;
683 gfc_add_function (&proc->attr, proc->name, NULL);
685 fas = ns->entries->sym->as;
686 fas = fas ? fas : ns->entries->sym->result->as;
687 fts = &ns->entries->sym->result->ts;
688 if (fts->type == BT_UNKNOWN)
689 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
690 for (el = ns->entries->next; el; el = el->next)
692 ts = &el->sym->result->ts;
694 as = as ? as : el->sym->result->as;
695 if (ts->type == BT_UNKNOWN)
696 ts = gfc_get_default_type (el->sym->result->name, NULL);
698 if (! gfc_compare_types (ts, fts)
699 || (el->sym->result->attr.dimension
700 != ns->entries->sym->result->attr.dimension)
701 || (el->sym->result->attr.pointer
702 != ns->entries->sym->result->attr.pointer))
704 else if (as && fas && ns->entries->sym->result != el->sym->result
705 && gfc_compare_array_spec (as, fas) == 0)
706 gfc_error ("Function %s at %L has entries with mismatched "
707 "array specifications", ns->entries->sym->name,
708 &ns->entries->sym->declared_at);
709 /* The characteristics need to match and thus both need to have
710 the same string length, i.e. both len=*, or both len=4.
711 Having both len=<variable> is also possible, but difficult to
712 check at compile time. */
713 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
714 && (((ts->u.cl->length && !fts->u.cl->length)
715 ||(!ts->u.cl->length && fts->u.cl->length))
717 && ts->u.cl->length->expr_type
718 != fts->u.cl->length->expr_type)
720 && ts->u.cl->length->expr_type == EXPR_CONSTANT
721 && mpz_cmp (ts->u.cl->length->value.integer,
722 fts->u.cl->length->value.integer) != 0)))
723 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
724 "entries returning variables of different "
725 "string lengths", ns->entries->sym->name,
726 &ns->entries->sym->declared_at);
731 sym = ns->entries->sym->result;
732 /* All result types the same. */
734 if (sym->attr.dimension)
735 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
736 if (sym->attr.pointer)
737 gfc_add_pointer (&proc->attr, NULL);
741 /* Otherwise the result will be passed through a union by
743 proc->attr.mixed_entry_master = 1;
744 for (el = ns->entries; el; el = el->next)
746 sym = el->sym->result;
747 if (sym->attr.dimension)
749 if (el == ns->entries)
750 gfc_error ("FUNCTION result %s can't be an array in "
751 "FUNCTION %s at %L", sym->name,
752 ns->entries->sym->name, &sym->declared_at);
754 gfc_error ("ENTRY result %s can't be an array in "
755 "FUNCTION %s at %L", sym->name,
756 ns->entries->sym->name, &sym->declared_at);
758 else if (sym->attr.pointer)
760 if (el == ns->entries)
761 gfc_error ("FUNCTION result %s can't be a POINTER in "
762 "FUNCTION %s at %L", sym->name,
763 ns->entries->sym->name, &sym->declared_at);
765 gfc_error ("ENTRY result %s can't be a POINTER in "
766 "FUNCTION %s at %L", sym->name,
767 ns->entries->sym->name, &sym->declared_at);
772 if (ts->type == BT_UNKNOWN)
773 ts = gfc_get_default_type (sym->name, NULL);
777 if (ts->kind == gfc_default_integer_kind)
781 if (ts->kind == gfc_default_real_kind
782 || ts->kind == gfc_default_double_kind)
786 if (ts->kind == gfc_default_complex_kind)
790 if (ts->kind == gfc_default_logical_kind)
794 /* We will issue error elsewhere. */
802 if (el == ns->entries)
803 gfc_error ("FUNCTION result %s can't be of type %s "
804 "in FUNCTION %s at %L", sym->name,
805 gfc_typename (ts), ns->entries->sym->name,
808 gfc_error ("ENTRY result %s can't be of type %s "
809 "in FUNCTION %s at %L", sym->name,
810 gfc_typename (ts), ns->entries->sym->name,
817 proc->attr.access = ACCESS_PRIVATE;
818 proc->attr.entry_master = 1;
820 /* Merge all the entry point arguments. */
821 for (el = ns->entries; el; el = el->next)
822 merge_argument_lists (proc, el->sym->formal);
824 /* Check the master formal arguments for any that are not
825 present in all entry points. */
826 for (el = ns->entries; el; el = el->next)
827 check_argument_lists (proc, el->sym->formal);
829 /* Use the master function for the function body. */
830 ns->proc_name = proc;
832 /* Finalize the new symbols. */
833 gfc_commit_symbols ();
835 /* Restore the original namespace. */
836 gfc_current_ns = old_ns;
840 /* Resolve common variables. */
842 resolve_common_vars (gfc_symbol *sym, bool named_common)
844 gfc_symbol *csym = sym;
846 for (; csym; csym = csym->common_next)
848 if (csym->value || csym->attr.data)
850 if (!csym->ns->is_block_data)
851 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
852 "but only in BLOCK DATA initialization is "
853 "allowed", csym->name, &csym->declared_at);
854 else if (!named_common)
855 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
856 "in a blank COMMON but initialization is only "
857 "allowed in named common blocks", csym->name,
861 if (csym->ts.type != BT_DERIVED)
864 if (!(csym->ts.u.derived->attr.sequence
865 || csym->ts.u.derived->attr.is_bind_c))
866 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
867 "has neither the SEQUENCE nor the BIND(C) "
868 "attribute", csym->name, &csym->declared_at);
869 if (csym->ts.u.derived->attr.alloc_comp)
870 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
871 "has an ultimate component that is "
872 "allocatable", csym->name, &csym->declared_at);
873 if (gfc_has_default_initializer (csym->ts.u.derived))
874 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
875 "may not have default initializer", csym->name,
878 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
879 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
883 /* Resolve common blocks. */
885 resolve_common_blocks (gfc_symtree *common_root)
889 if (common_root == NULL)
892 if (common_root->left)
893 resolve_common_blocks (common_root->left);
894 if (common_root->right)
895 resolve_common_blocks (common_root->right);
897 resolve_common_vars (common_root->n.common->head, true);
899 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
903 if (sym->attr.flavor == FL_PARAMETER)
904 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
905 sym->name, &common_root->n.common->where, &sym->declared_at);
907 if (sym->attr.intrinsic)
908 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
909 sym->name, &common_root->n.common->where);
910 else if (sym->attr.result
911 || gfc_is_function_return_value (sym, gfc_current_ns))
912 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
913 "that is also a function result", sym->name,
914 &common_root->n.common->where);
915 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
916 && sym->attr.proc != PROC_ST_FUNCTION)
917 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
918 "that is also a global procedure", sym->name,
919 &common_root->n.common->where);
923 /* Resolve contained function types. Because contained functions can call one
924 another, they have to be worked out before any of the contained procedures
927 The good news is that if a function doesn't already have a type, the only
928 way it can get one is through an IMPLICIT type or a RESULT variable, because
929 by definition contained functions are contained namespace they're contained
930 in, not in a sibling or parent namespace. */
933 resolve_contained_functions (gfc_namespace *ns)
935 gfc_namespace *child;
938 resolve_formal_arglists (ns);
940 for (child = ns->contained; child; child = child->sibling)
942 /* Resolve alternate entry points first. */
943 resolve_entries (child);
945 /* Then check function return types. */
946 resolve_contained_fntype (child->proc_name, child);
947 for (el = child->entries; el; el = el->next)
948 resolve_contained_fntype (el->sym, child);
953 static gfc_try resolve_fl_derived0 (gfc_symbol *sym);
956 /* Resolve all of the elements of a structure constructor and make sure that
957 the types are correct. The 'init' flag indicates that the given
958 constructor is an initializer. */
961 resolve_structure_cons (gfc_expr *expr, int init)
963 gfc_constructor *cons;
970 if (expr->ts.type == BT_DERIVED)
971 resolve_fl_derived0 (expr->ts.u.derived);
973 cons = gfc_constructor_first (expr->value.constructor);
974 /* A constructor may have references if it is the result of substituting a
975 parameter variable. In this case we just pull out the component we
978 comp = expr->ref->u.c.sym->components;
980 comp = expr->ts.u.derived->components;
982 /* See if the user is trying to invoke a structure constructor for one of
983 the iso_c_binding derived types. */
984 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
985 && expr->ts.u.derived->ts.is_iso_c && cons
986 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
988 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
989 expr->ts.u.derived->name, &(expr->where));
993 /* Return if structure constructor is c_null_(fun)prt. */
994 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
995 && expr->ts.u.derived->ts.is_iso_c && cons
996 && cons->expr && cons->expr->expr_type == EXPR_NULL)
999 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
1006 if (gfc_resolve_expr (cons->expr) == FAILURE)
1012 rank = comp->as ? comp->as->rank : 0;
1013 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
1014 && (comp->attr.allocatable || cons->expr->rank))
1016 gfc_error ("The rank of the element in the derived type "
1017 "constructor at %L does not match that of the "
1018 "component (%d/%d)", &cons->expr->where,
1019 cons->expr->rank, rank);
1023 /* If we don't have the right type, try to convert it. */
1025 if (!comp->attr.proc_pointer &&
1026 !gfc_compare_types (&cons->expr->ts, &comp->ts))
1029 if (strcmp (comp->name, "_extends") == 0)
1031 /* Can afford to be brutal with the _extends initializer.
1032 The derived type can get lost because it is PRIVATE
1033 but it is not usage constrained by the standard. */
1034 cons->expr->ts = comp->ts;
1037 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
1038 gfc_error ("The element in the derived type constructor at %L, "
1039 "for pointer component '%s', is %s but should be %s",
1040 &cons->expr->where, comp->name,
1041 gfc_basic_typename (cons->expr->ts.type),
1042 gfc_basic_typename (comp->ts.type));
1044 t = gfc_convert_type (cons->expr, &comp->ts, 1);
1047 /* For strings, the length of the constructor should be the same as
1048 the one of the structure, ensure this if the lengths are known at
1049 compile time and when we are dealing with PARAMETER or structure
1051 if (cons->expr->ts.type == BT_CHARACTER && comp->ts.u.cl
1052 && comp->ts.u.cl->length
1053 && comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
1054 && cons->expr->ts.u.cl && cons->expr->ts.u.cl->length
1055 && cons->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
1056 && mpz_cmp (cons->expr->ts.u.cl->length->value.integer,
1057 comp->ts.u.cl->length->value.integer) != 0)
1059 if (cons->expr->expr_type == EXPR_VARIABLE
1060 && cons->expr->symtree->n.sym->attr.flavor == FL_PARAMETER)
1062 /* Wrap the parameter in an array constructor (EXPR_ARRAY)
1063 to make use of the gfc_resolve_character_array_constructor
1064 machinery. The expression is later simplified away to
1065 an array of string literals. */
1066 gfc_expr *para = cons->expr;
1067 cons->expr = gfc_get_expr ();
1068 cons->expr->ts = para->ts;
1069 cons->expr->where = para->where;
1070 cons->expr->expr_type = EXPR_ARRAY;
1071 cons->expr->rank = para->rank;
1072 cons->expr->shape = gfc_copy_shape (para->shape, para->rank);
1073 gfc_constructor_append_expr (&cons->expr->value.constructor,
1074 para, &cons->expr->where);
1076 if (cons->expr->expr_type == EXPR_ARRAY)
1079 p = gfc_constructor_first (cons->expr->value.constructor);
1080 if (cons->expr->ts.u.cl != p->expr->ts.u.cl)
1082 gfc_charlen *cl, *cl2;
1085 for (cl = gfc_current_ns->cl_list; cl; cl = cl->next)
1087 if (cl == cons->expr->ts.u.cl)
1095 cl2->next = cl->next;
1097 gfc_free_expr (cl->length);
1101 cons->expr->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1102 cons->expr->ts.u.cl->length_from_typespec = true;
1103 cons->expr->ts.u.cl->length = gfc_copy_expr (comp->ts.u.cl->length);
1104 gfc_resolve_character_array_constructor (cons->expr);
1108 if (cons->expr->expr_type == EXPR_NULL
1109 && !(comp->attr.pointer || comp->attr.allocatable
1110 || comp->attr.proc_pointer
1111 || (comp->ts.type == BT_CLASS
1112 && (CLASS_DATA (comp)->attr.class_pointer
1113 || CLASS_DATA (comp)->attr.allocatable))))
1116 gfc_error ("The NULL in the derived type constructor at %L is "
1117 "being applied to component '%s', which is neither "
1118 "a POINTER nor ALLOCATABLE", &cons->expr->where,
1122 if (!comp->attr.pointer || comp->attr.proc_pointer
1123 || cons->expr->expr_type == EXPR_NULL)
1126 a = gfc_expr_attr (cons->expr);
1128 if (!a.pointer && !a.target)
1131 gfc_error ("The element in the derived type constructor at %L, "
1132 "for pointer component '%s' should be a POINTER or "
1133 "a TARGET", &cons->expr->where, comp->name);
1138 /* F08:C461. Additional checks for pointer initialization. */
1142 gfc_error ("Pointer initialization target at %L "
1143 "must not be ALLOCATABLE ", &cons->expr->where);
1148 gfc_error ("Pointer initialization target at %L "
1149 "must have the SAVE attribute", &cons->expr->where);
1153 /* F2003, C1272 (3). */
1154 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
1155 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1156 || gfc_is_coindexed (cons->expr)))
1159 gfc_error ("Invalid expression in the derived type constructor for "
1160 "pointer component '%s' at %L in PURE procedure",
1161 comp->name, &cons->expr->where);
1164 if (gfc_implicit_pure (NULL)
1165 && cons->expr->expr_type == EXPR_VARIABLE
1166 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1167 || gfc_is_coindexed (cons->expr)))
1168 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1176 /****************** Expression name resolution ******************/
1178 /* Returns 0 if a symbol was not declared with a type or
1179 attribute declaration statement, nonzero otherwise. */
1182 was_declared (gfc_symbol *sym)
1188 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
1191 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
1192 || a.optional || a.pointer || a.save || a.target || a.volatile_
1193 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
1194 || a.asynchronous || a.codimension)
1201 /* Determine if a symbol is generic or not. */
1204 generic_sym (gfc_symbol *sym)
1208 if (sym->attr.generic ||
1209 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
1212 if (was_declared (sym) || sym->ns->parent == NULL)
1215 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1222 return generic_sym (s);
1229 /* Determine if a symbol is specific or not. */
1232 specific_sym (gfc_symbol *sym)
1236 if (sym->attr.if_source == IFSRC_IFBODY
1237 || sym->attr.proc == PROC_MODULE
1238 || sym->attr.proc == PROC_INTERNAL
1239 || sym->attr.proc == PROC_ST_FUNCTION
1240 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1241 || sym->attr.external)
1244 if (was_declared (sym) || sym->ns->parent == NULL)
1247 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1249 return (s == NULL) ? 0 : specific_sym (s);
1253 /* Figure out if the procedure is specific, generic or unknown. */
1256 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1260 procedure_kind (gfc_symbol *sym)
1262 if (generic_sym (sym))
1263 return PTYPE_GENERIC;
1265 if (specific_sym (sym))
1266 return PTYPE_SPECIFIC;
1268 return PTYPE_UNKNOWN;
1271 /* Check references to assumed size arrays. The flag need_full_assumed_size
1272 is nonzero when matching actual arguments. */
1274 static int need_full_assumed_size = 0;
1277 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1279 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1282 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1283 What should it be? */
1284 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1285 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1286 && (e->ref->u.ar.type == AR_FULL))
1288 gfc_error ("The upper bound in the last dimension must "
1289 "appear in the reference to the assumed size "
1290 "array '%s' at %L", sym->name, &e->where);
1297 /* Look for bad assumed size array references in argument expressions
1298 of elemental and array valued intrinsic procedures. Since this is
1299 called from procedure resolution functions, it only recurses at
1303 resolve_assumed_size_actual (gfc_expr *e)
1308 switch (e->expr_type)
1311 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1316 if (resolve_assumed_size_actual (e->value.op.op1)
1317 || resolve_assumed_size_actual (e->value.op.op2))
1328 /* Check a generic procedure, passed as an actual argument, to see if
1329 there is a matching specific name. If none, it is an error, and if
1330 more than one, the reference is ambiguous. */
1332 count_specific_procs (gfc_expr *e)
1339 sym = e->symtree->n.sym;
1341 for (p = sym->generic; p; p = p->next)
1342 if (strcmp (sym->name, p->sym->name) == 0)
1344 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1350 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1354 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1355 "argument at %L", sym->name, &e->where);
1361 /* See if a call to sym could possibly be a not allowed RECURSION because of
1362 a missing RECURIVE declaration. This means that either sym is the current
1363 context itself, or sym is the parent of a contained procedure calling its
1364 non-RECURSIVE containing procedure.
1365 This also works if sym is an ENTRY. */
1368 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1370 gfc_symbol* proc_sym;
1371 gfc_symbol* context_proc;
1372 gfc_namespace* real_context;
1374 if (sym->attr.flavor == FL_PROGRAM)
1377 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1379 /* If we've got an ENTRY, find real procedure. */
1380 if (sym->attr.entry && sym->ns->entries)
1381 proc_sym = sym->ns->entries->sym;
1385 /* If sym is RECURSIVE, all is well of course. */
1386 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1389 /* Find the context procedure's "real" symbol if it has entries.
1390 We look for a procedure symbol, so recurse on the parents if we don't
1391 find one (like in case of a BLOCK construct). */
1392 for (real_context = context; ; real_context = real_context->parent)
1394 /* We should find something, eventually! */
1395 gcc_assert (real_context);
1397 context_proc = (real_context->entries ? real_context->entries->sym
1398 : real_context->proc_name);
1400 /* In some special cases, there may not be a proc_name, like for this
1402 real(bad_kind()) function foo () ...
1403 when checking the call to bad_kind ().
1404 In these cases, we simply return here and assume that the
1409 if (context_proc->attr.flavor != FL_LABEL)
1413 /* A call from sym's body to itself is recursion, of course. */
1414 if (context_proc == proc_sym)
1417 /* The same is true if context is a contained procedure and sym the
1419 if (context_proc->attr.contained)
1421 gfc_symbol* parent_proc;
1423 gcc_assert (context->parent);
1424 parent_proc = (context->parent->entries ? context->parent->entries->sym
1425 : context->parent->proc_name);
1427 if (parent_proc == proc_sym)
1435 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1436 its typespec and formal argument list. */
1439 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1441 gfc_intrinsic_sym* isym = NULL;
1447 /* Already resolved. */
1448 if (sym->from_intmod && sym->ts.type != BT_UNKNOWN)
1451 /* We already know this one is an intrinsic, so we don't call
1452 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1453 gfc_find_subroutine directly to check whether it is a function or
1456 if (sym->intmod_sym_id)
1457 isym = gfc_intrinsic_function_by_id ((gfc_isym_id) sym->intmod_sym_id);
1459 isym = gfc_find_function (sym->name);
1463 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1464 && !sym->attr.implicit_type)
1465 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1466 " ignored", sym->name, &sym->declared_at);
1468 if (!sym->attr.function &&
1469 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1474 else if ((isym = gfc_find_subroutine (sym->name)))
1476 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1478 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1479 " specifier", sym->name, &sym->declared_at);
1483 if (!sym->attr.subroutine &&
1484 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1489 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1494 gfc_copy_formal_args_intr (sym, isym);
1496 /* Check it is actually available in the standard settings. */
1497 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1500 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1501 " available in the current standard settings but %s. Use"
1502 " an appropriate -std=* option or enable -fall-intrinsics"
1503 " in order to use it.",
1504 sym->name, &sym->declared_at, symstd);
1512 /* Resolve a procedure expression, like passing it to a called procedure or as
1513 RHS for a procedure pointer assignment. */
1516 resolve_procedure_expression (gfc_expr* expr)
1520 if (expr->expr_type != EXPR_VARIABLE)
1522 gcc_assert (expr->symtree);
1524 sym = expr->symtree->n.sym;
1526 if (sym->attr.intrinsic)
1527 resolve_intrinsic (sym, &expr->where);
1529 if (sym->attr.flavor != FL_PROCEDURE
1530 || (sym->attr.function && sym->result == sym))
1533 /* A non-RECURSIVE procedure that is used as procedure expression within its
1534 own body is in danger of being called recursively. */
1535 if (is_illegal_recursion (sym, gfc_current_ns))
1536 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1537 " itself recursively. Declare it RECURSIVE or use"
1538 " -frecursive", sym->name, &expr->where);
1544 /* Resolve an actual argument list. Most of the time, this is just
1545 resolving the expressions in the list.
1546 The exception is that we sometimes have to decide whether arguments
1547 that look like procedure arguments are really simple variable
1551 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1552 bool no_formal_args)
1555 gfc_symtree *parent_st;
1557 int save_need_full_assumed_size;
1559 for (; arg; arg = arg->next)
1564 /* Check the label is a valid branching target. */
1567 if (arg->label->defined == ST_LABEL_UNKNOWN)
1569 gfc_error ("Label %d referenced at %L is never defined",
1570 arg->label->value, &arg->label->where);
1577 if (e->expr_type == EXPR_VARIABLE
1578 && e->symtree->n.sym->attr.generic
1580 && count_specific_procs (e) != 1)
1583 if (e->ts.type != BT_PROCEDURE)
1585 save_need_full_assumed_size = need_full_assumed_size;
1586 if (e->expr_type != EXPR_VARIABLE)
1587 need_full_assumed_size = 0;
1588 if (gfc_resolve_expr (e) != SUCCESS)
1590 need_full_assumed_size = save_need_full_assumed_size;
1594 /* See if the expression node should really be a variable reference. */
1596 sym = e->symtree->n.sym;
1598 if (sym->attr.flavor == FL_PROCEDURE
1599 || sym->attr.intrinsic
1600 || sym->attr.external)
1604 /* If a procedure is not already determined to be something else
1605 check if it is intrinsic. */
1606 if (!sym->attr.intrinsic
1607 && !(sym->attr.external || sym->attr.use_assoc
1608 || sym->attr.if_source == IFSRC_IFBODY)
1609 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1610 sym->attr.intrinsic = 1;
1612 if (sym->attr.proc == PROC_ST_FUNCTION)
1614 gfc_error ("Statement function '%s' at %L is not allowed as an "
1615 "actual argument", sym->name, &e->where);
1618 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1619 sym->attr.subroutine);
1620 if (sym->attr.intrinsic && actual_ok == 0)
1622 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1623 "actual argument", sym->name, &e->where);
1626 if (sym->attr.contained && !sym->attr.use_assoc
1627 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1629 if (gfc_notify_std (GFC_STD_F2008,
1630 "Fortran 2008: Internal procedure '%s' is"
1631 " used as actual argument at %L",
1632 sym->name, &e->where) == FAILURE)
1636 if (sym->attr.elemental && !sym->attr.intrinsic)
1638 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1639 "allowed as an actual argument at %L", sym->name,
1643 /* Check if a generic interface has a specific procedure
1644 with the same name before emitting an error. */
1645 if (sym->attr.generic && count_specific_procs (e) != 1)
1648 /* Just in case a specific was found for the expression. */
1649 sym = e->symtree->n.sym;
1651 /* If the symbol is the function that names the current (or
1652 parent) scope, then we really have a variable reference. */
1654 if (gfc_is_function_return_value (sym, sym->ns))
1657 /* If all else fails, see if we have a specific intrinsic. */
1658 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1660 gfc_intrinsic_sym *isym;
1662 isym = gfc_find_function (sym->name);
1663 if (isym == NULL || !isym->specific)
1665 gfc_error ("Unable to find a specific INTRINSIC procedure "
1666 "for the reference '%s' at %L", sym->name,
1671 sym->attr.intrinsic = 1;
1672 sym->attr.function = 1;
1675 if (gfc_resolve_expr (e) == FAILURE)
1680 /* See if the name is a module procedure in a parent unit. */
1682 if (was_declared (sym) || sym->ns->parent == NULL)
1685 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1687 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1691 if (parent_st == NULL)
1694 sym = parent_st->n.sym;
1695 e->symtree = parent_st; /* Point to the right thing. */
1697 if (sym->attr.flavor == FL_PROCEDURE
1698 || sym->attr.intrinsic
1699 || sym->attr.external)
1701 if (gfc_resolve_expr (e) == FAILURE)
1707 e->expr_type = EXPR_VARIABLE;
1709 if (sym->as != NULL)
1711 e->rank = sym->as->rank;
1712 e->ref = gfc_get_ref ();
1713 e->ref->type = REF_ARRAY;
1714 e->ref->u.ar.type = AR_FULL;
1715 e->ref->u.ar.as = sym->as;
1718 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1719 primary.c (match_actual_arg). If above code determines that it
1720 is a variable instead, it needs to be resolved as it was not
1721 done at the beginning of this function. */
1722 save_need_full_assumed_size = need_full_assumed_size;
1723 if (e->expr_type != EXPR_VARIABLE)
1724 need_full_assumed_size = 0;
1725 if (gfc_resolve_expr (e) != SUCCESS)
1727 need_full_assumed_size = save_need_full_assumed_size;
1730 /* Check argument list functions %VAL, %LOC and %REF. There is
1731 nothing to do for %REF. */
1732 if (arg->name && arg->name[0] == '%')
1734 if (strncmp ("%VAL", arg->name, 4) == 0)
1736 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1738 gfc_error ("By-value argument at %L is not of numeric "
1745 gfc_error ("By-value argument at %L cannot be an array or "
1746 "an array section", &e->where);
1750 /* Intrinsics are still PROC_UNKNOWN here. However,
1751 since same file external procedures are not resolvable
1752 in gfortran, it is a good deal easier to leave them to
1754 if (ptype != PROC_UNKNOWN
1755 && ptype != PROC_DUMMY
1756 && ptype != PROC_EXTERNAL
1757 && ptype != PROC_MODULE)
1759 gfc_error ("By-value argument at %L is not allowed "
1760 "in this context", &e->where);
1765 /* Statement functions have already been excluded above. */
1766 else if (strncmp ("%LOC", arg->name, 4) == 0
1767 && e->ts.type == BT_PROCEDURE)
1769 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1771 gfc_error ("Passing internal procedure at %L by location "
1772 "not allowed", &e->where);
1778 /* Fortran 2008, C1237. */
1779 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1780 && gfc_has_ultimate_pointer (e))
1782 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1783 "component", &e->where);
1792 /* Do the checks of the actual argument list that are specific to elemental
1793 procedures. If called with c == NULL, we have a function, otherwise if
1794 expr == NULL, we have a subroutine. */
1797 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1799 gfc_actual_arglist *arg0;
1800 gfc_actual_arglist *arg;
1801 gfc_symbol *esym = NULL;
1802 gfc_intrinsic_sym *isym = NULL;
1804 gfc_intrinsic_arg *iformal = NULL;
1805 gfc_formal_arglist *eformal = NULL;
1806 bool formal_optional = false;
1807 bool set_by_optional = false;
1811 /* Is this an elemental procedure? */
1812 if (expr && expr->value.function.actual != NULL)
1814 if (expr->value.function.esym != NULL
1815 && expr->value.function.esym->attr.elemental)
1817 arg0 = expr->value.function.actual;
1818 esym = expr->value.function.esym;
1820 else if (expr->value.function.isym != NULL
1821 && expr->value.function.isym->elemental)
1823 arg0 = expr->value.function.actual;
1824 isym = expr->value.function.isym;
1829 else if (c && c->ext.actual != NULL)
1831 arg0 = c->ext.actual;
1833 if (c->resolved_sym)
1834 esym = c->resolved_sym;
1836 esym = c->symtree->n.sym;
1839 if (!esym->attr.elemental)
1845 /* The rank of an elemental is the rank of its array argument(s). */
1846 for (arg = arg0; arg; arg = arg->next)
1848 if (arg->expr != NULL && arg->expr->rank > 0)
1850 rank = arg->expr->rank;
1851 if (arg->expr->expr_type == EXPR_VARIABLE
1852 && arg->expr->symtree->n.sym->attr.optional)
1853 set_by_optional = true;
1855 /* Function specific; set the result rank and shape. */
1859 if (!expr->shape && arg->expr->shape)
1861 expr->shape = gfc_get_shape (rank);
1862 for (i = 0; i < rank; i++)
1863 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1870 /* If it is an array, it shall not be supplied as an actual argument
1871 to an elemental procedure unless an array of the same rank is supplied
1872 as an actual argument corresponding to a nonoptional dummy argument of
1873 that elemental procedure(12.4.1.5). */
1874 formal_optional = false;
1876 iformal = isym->formal;
1878 eformal = esym->formal;
1880 for (arg = arg0; arg; arg = arg->next)
1884 if (eformal->sym && eformal->sym->attr.optional)
1885 formal_optional = true;
1886 eformal = eformal->next;
1888 else if (isym && iformal)
1890 if (iformal->optional)
1891 formal_optional = true;
1892 iformal = iformal->next;
1895 formal_optional = true;
1897 if (pedantic && arg->expr != NULL
1898 && arg->expr->expr_type == EXPR_VARIABLE
1899 && arg->expr->symtree->n.sym->attr.optional
1902 && (set_by_optional || arg->expr->rank != rank)
1903 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1905 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1906 "MISSING, it cannot be the actual argument of an "
1907 "ELEMENTAL procedure unless there is a non-optional "
1908 "argument with the same rank (12.4.1.5)",
1909 arg->expr->symtree->n.sym->name, &arg->expr->where);
1914 for (arg = arg0; arg; arg = arg->next)
1916 if (arg->expr == NULL || arg->expr->rank == 0)
1919 /* Being elemental, the last upper bound of an assumed size array
1920 argument must be present. */
1921 if (resolve_assumed_size_actual (arg->expr))
1924 /* Elemental procedure's array actual arguments must conform. */
1927 if (gfc_check_conformance (arg->expr, e,
1928 "elemental procedure") == FAILURE)
1935 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1936 is an array, the intent inout/out variable needs to be also an array. */
1937 if (rank > 0 && esym && expr == NULL)
1938 for (eformal = esym->formal, arg = arg0; arg && eformal;
1939 arg = arg->next, eformal = eformal->next)
1940 if ((eformal->sym->attr.intent == INTENT_OUT
1941 || eformal->sym->attr.intent == INTENT_INOUT)
1942 && arg->expr && arg->expr->rank == 0)
1944 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1945 "ELEMENTAL subroutine '%s' is a scalar, but another "
1946 "actual argument is an array", &arg->expr->where,
1947 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1948 : "INOUT", eformal->sym->name, esym->name);
1955 /* This function does the checking of references to global procedures
1956 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1957 77 and 95 standards. It checks for a gsymbol for the name, making
1958 one if it does not already exist. If it already exists, then the
1959 reference being resolved must correspond to the type of gsymbol.
1960 Otherwise, the new symbol is equipped with the attributes of the
1961 reference. The corresponding code that is called in creating
1962 global entities is parse.c.
1964 In addition, for all but -std=legacy, the gsymbols are used to
1965 check the interfaces of external procedures from the same file.
1966 The namespace of the gsymbol is resolved and then, once this is
1967 done the interface is checked. */
1971 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1973 if (!gsym_ns->proc_name->attr.recursive)
1976 if (sym->ns == gsym_ns)
1979 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1986 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1988 if (gsym_ns->entries)
1990 gfc_entry_list *entry = gsym_ns->entries;
1992 for (; entry; entry = entry->next)
1994 if (strcmp (sym->name, entry->sym->name) == 0)
1996 if (strcmp (gsym_ns->proc_name->name,
1997 sym->ns->proc_name->name) == 0)
2001 && strcmp (gsym_ns->proc_name->name,
2002 sym->ns->parent->proc_name->name) == 0)
2011 resolve_global_procedure (gfc_symbol *sym, locus *where,
2012 gfc_actual_arglist **actual, int sub)
2016 enum gfc_symbol_type type;
2018 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
2020 gsym = gfc_get_gsymbol (sym->name);
2022 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
2023 gfc_global_used (gsym, where);
2025 if (gfc_option.flag_whole_file
2026 && (sym->attr.if_source == IFSRC_UNKNOWN
2027 || sym->attr.if_source == IFSRC_IFBODY)
2028 && gsym->type != GSYM_UNKNOWN
2030 && gsym->ns->resolved != -1
2031 && gsym->ns->proc_name
2032 && not_in_recursive (sym, gsym->ns)
2033 && not_entry_self_reference (sym, gsym->ns))
2035 gfc_symbol *def_sym;
2037 /* Resolve the gsymbol namespace if needed. */
2038 if (!gsym->ns->resolved)
2040 gfc_dt_list *old_dt_list;
2041 struct gfc_omp_saved_state old_omp_state;
2043 /* Stash away derived types so that the backend_decls do not
2045 old_dt_list = gfc_derived_types;
2046 gfc_derived_types = NULL;
2047 /* And stash away openmp state. */
2048 gfc_omp_save_and_clear_state (&old_omp_state);
2050 gfc_resolve (gsym->ns);
2052 /* Store the new derived types with the global namespace. */
2053 if (gfc_derived_types)
2054 gsym->ns->derived_types = gfc_derived_types;
2056 /* Restore the derived types of this namespace. */
2057 gfc_derived_types = old_dt_list;
2058 /* And openmp state. */
2059 gfc_omp_restore_state (&old_omp_state);
2062 /* Make sure that translation for the gsymbol occurs before
2063 the procedure currently being resolved. */
2064 ns = gfc_global_ns_list;
2065 for (; ns && ns != gsym->ns; ns = ns->sibling)
2067 if (ns->sibling == gsym->ns)
2069 ns->sibling = gsym->ns->sibling;
2070 gsym->ns->sibling = gfc_global_ns_list;
2071 gfc_global_ns_list = gsym->ns;
2076 def_sym = gsym->ns->proc_name;
2077 if (def_sym->attr.entry_master)
2079 gfc_entry_list *entry;
2080 for (entry = gsym->ns->entries; entry; entry = entry->next)
2081 if (strcmp (entry->sym->name, sym->name) == 0)
2083 def_sym = entry->sym;
2088 /* Differences in constant character lengths. */
2089 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
2091 long int l1 = 0, l2 = 0;
2092 gfc_charlen *cl1 = sym->ts.u.cl;
2093 gfc_charlen *cl2 = def_sym->ts.u.cl;
2096 && cl1->length != NULL
2097 && cl1->length->expr_type == EXPR_CONSTANT)
2098 l1 = mpz_get_si (cl1->length->value.integer);
2101 && cl2->length != NULL
2102 && cl2->length->expr_type == EXPR_CONSTANT)
2103 l2 = mpz_get_si (cl2->length->value.integer);
2105 if (l1 && l2 && l1 != l2)
2106 gfc_error ("Character length mismatch in return type of "
2107 "function '%s' at %L (%ld/%ld)", sym->name,
2108 &sym->declared_at, l1, l2);
2111 /* Type mismatch of function return type and expected type. */
2112 if (sym->attr.function
2113 && !gfc_compare_types (&sym->ts, &def_sym->ts))
2114 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
2115 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
2116 gfc_typename (&def_sym->ts));
2118 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
2120 gfc_formal_arglist *arg = def_sym->formal;
2121 for ( ; arg; arg = arg->next)
2124 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
2125 else if (arg->sym->attr.allocatable
2126 || arg->sym->attr.asynchronous
2127 || arg->sym->attr.optional
2128 || arg->sym->attr.pointer
2129 || arg->sym->attr.target
2130 || arg->sym->attr.value
2131 || arg->sym->attr.volatile_)
2133 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
2134 "has an attribute that requires an explicit "
2135 "interface for this procedure", arg->sym->name,
2136 sym->name, &sym->declared_at);
2139 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
2140 else if (arg->sym && arg->sym->as
2141 && arg->sym->as->type == AS_ASSUMED_SHAPE)
2143 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
2144 "argument '%s' must have an explicit interface",
2145 sym->name, &sym->declared_at, arg->sym->name);
2148 /* F2008, 12.4.2.2 (2c) */
2149 else if (arg->sym->attr.codimension)
2151 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
2152 "'%s' must have an explicit interface",
2153 sym->name, &sym->declared_at, arg->sym->name);
2156 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
2157 else if (false) /* TODO: is a parametrized derived type */
2159 gfc_error ("Procedure '%s' at %L with parametrized derived "
2160 "type argument '%s' must have an explicit "
2161 "interface", sym->name, &sym->declared_at,
2165 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
2166 else if (arg->sym->ts.type == BT_CLASS)
2168 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
2169 "argument '%s' must have an explicit interface",
2170 sym->name, &sym->declared_at, arg->sym->name);
2175 if (def_sym->attr.function)
2177 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
2178 if (def_sym->as && def_sym->as->rank
2179 && (!sym->as || sym->as->rank != def_sym->as->rank))
2180 gfc_error ("The reference to function '%s' at %L either needs an "
2181 "explicit INTERFACE or the rank is incorrect", sym->name,
2184 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
2185 if ((def_sym->result->attr.pointer
2186 || def_sym->result->attr.allocatable)
2187 && (sym->attr.if_source != IFSRC_IFBODY
2188 || def_sym->result->attr.pointer
2189 != sym->result->attr.pointer
2190 || def_sym->result->attr.allocatable
2191 != sym->result->attr.allocatable))
2192 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
2193 "result must have an explicit interface", sym->name,
2196 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
2197 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
2198 && def_sym->ts.type == BT_CHARACTER && def_sym->ts.u.cl->length != NULL)
2200 gfc_charlen *cl = sym->ts.u.cl;
2202 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
2203 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
2205 gfc_error ("Nonconstant character-length function '%s' at %L "
2206 "must have an explicit interface", sym->name,
2212 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2213 if (def_sym->attr.elemental && !sym->attr.elemental)
2215 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2216 "interface", sym->name, &sym->declared_at);
2219 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2220 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2222 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2223 "an explicit interface", sym->name, &sym->declared_at);
2226 if (gfc_option.flag_whole_file == 1
2227 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2228 && !(gfc_option.warn_std & GFC_STD_GNU)))
2229 gfc_errors_to_warnings (1);
2231 if (sym->attr.if_source != IFSRC_IFBODY)
2232 gfc_procedure_use (def_sym, actual, where);
2234 gfc_errors_to_warnings (0);
2237 if (gsym->type == GSYM_UNKNOWN)
2240 gsym->where = *where;
2247 /************* Function resolution *************/
2249 /* Resolve a function call known to be generic.
2250 Section 14.1.2.4.1. */
2253 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2257 if (sym->attr.generic)
2259 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2262 expr->value.function.name = s->name;
2263 expr->value.function.esym = s;
2265 if (s->ts.type != BT_UNKNOWN)
2267 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2268 expr->ts = s->result->ts;
2271 expr->rank = s->as->rank;
2272 else if (s->result != NULL && s->result->as != NULL)
2273 expr->rank = s->result->as->rank;
2275 gfc_set_sym_referenced (expr->value.function.esym);
2280 /* TODO: Need to search for elemental references in generic
2284 if (sym->attr.intrinsic)
2285 return gfc_intrinsic_func_interface (expr, 0);
2292 resolve_generic_f (gfc_expr *expr)
2297 sym = expr->symtree->n.sym;
2301 m = resolve_generic_f0 (expr, sym);
2304 else if (m == MATCH_ERROR)
2308 if (sym->ns->parent == NULL)
2310 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2314 if (!generic_sym (sym))
2318 /* Last ditch attempt. See if the reference is to an intrinsic
2319 that possesses a matching interface. 14.1.2.4 */
2320 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2322 gfc_error ("There is no specific function for the generic '%s' at %L",
2323 expr->symtree->n.sym->name, &expr->where);
2327 m = gfc_intrinsic_func_interface (expr, 0);
2331 gfc_error ("Generic function '%s' at %L is not consistent with a "
2332 "specific intrinsic interface", expr->symtree->n.sym->name,
2339 /* Resolve a function call known to be specific. */
2342 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2346 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2348 if (sym->attr.dummy)
2350 sym->attr.proc = PROC_DUMMY;
2354 sym->attr.proc = PROC_EXTERNAL;
2358 if (sym->attr.proc == PROC_MODULE
2359 || sym->attr.proc == PROC_ST_FUNCTION
2360 || sym->attr.proc == PROC_INTERNAL)
2363 if (sym->attr.intrinsic)
2365 m = gfc_intrinsic_func_interface (expr, 1);
2369 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2370 "with an intrinsic", sym->name, &expr->where);
2378 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2381 expr->ts = sym->result->ts;
2384 expr->value.function.name = sym->name;
2385 expr->value.function.esym = sym;
2386 if (sym->as != NULL)
2387 expr->rank = sym->as->rank;
2394 resolve_specific_f (gfc_expr *expr)
2399 sym = expr->symtree->n.sym;
2403 m = resolve_specific_f0 (sym, expr);
2406 if (m == MATCH_ERROR)
2409 if (sym->ns->parent == NULL)
2412 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2418 gfc_error ("Unable to resolve the specific function '%s' at %L",
2419 expr->symtree->n.sym->name, &expr->where);
2425 /* Resolve a procedure call not known to be generic nor specific. */
2428 resolve_unknown_f (gfc_expr *expr)
2433 sym = expr->symtree->n.sym;
2435 if (sym->attr.dummy)
2437 sym->attr.proc = PROC_DUMMY;
2438 expr->value.function.name = sym->name;
2442 /* See if we have an intrinsic function reference. */
2444 if (gfc_is_intrinsic (sym, 0, expr->where))
2446 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2451 /* The reference is to an external name. */
2453 sym->attr.proc = PROC_EXTERNAL;
2454 expr->value.function.name = sym->name;
2455 expr->value.function.esym = expr->symtree->n.sym;
2457 if (sym->as != NULL)
2458 expr->rank = sym->as->rank;
2460 /* Type of the expression is either the type of the symbol or the
2461 default type of the symbol. */
2464 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2466 if (sym->ts.type != BT_UNKNOWN)
2470 ts = gfc_get_default_type (sym->name, sym->ns);
2472 if (ts->type == BT_UNKNOWN)
2474 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2475 sym->name, &expr->where);
2486 /* Return true, if the symbol is an external procedure. */
2488 is_external_proc (gfc_symbol *sym)
2490 if (!sym->attr.dummy && !sym->attr.contained
2491 && !(sym->attr.intrinsic
2492 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2493 && sym->attr.proc != PROC_ST_FUNCTION
2494 && !sym->attr.proc_pointer
2495 && !sym->attr.use_assoc
2503 /* Figure out if a function reference is pure or not. Also set the name
2504 of the function for a potential error message. Return nonzero if the
2505 function is PURE, zero if not. */
2507 pure_stmt_function (gfc_expr *, gfc_symbol *);
2510 pure_function (gfc_expr *e, const char **name)
2516 if (e->symtree != NULL
2517 && e->symtree->n.sym != NULL
2518 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2519 return pure_stmt_function (e, e->symtree->n.sym);
2521 if (e->value.function.esym)
2523 pure = gfc_pure (e->value.function.esym);
2524 *name = e->value.function.esym->name;
2526 else if (e->value.function.isym)
2528 pure = e->value.function.isym->pure
2529 || e->value.function.isym->elemental;
2530 *name = e->value.function.isym->name;
2534 /* Implicit functions are not pure. */
2536 *name = e->value.function.name;
2544 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2545 int *f ATTRIBUTE_UNUSED)
2549 /* Don't bother recursing into other statement functions
2550 since they will be checked individually for purity. */
2551 if (e->expr_type != EXPR_FUNCTION
2553 || e->symtree->n.sym == sym
2554 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2557 return pure_function (e, &name) ? false : true;
2562 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2564 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2569 is_scalar_expr_ptr (gfc_expr *expr)
2571 gfc_try retval = SUCCESS;
2576 /* See if we have a gfc_ref, which means we have a substring, array
2577 reference, or a component. */
2578 if (expr->ref != NULL)
2581 while (ref->next != NULL)
2587 if (ref->u.ss.start == NULL || ref->u.ss.end == NULL
2588 || gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) != 0)
2593 if (ref->u.ar.type == AR_ELEMENT)
2595 else if (ref->u.ar.type == AR_FULL)
2597 /* The user can give a full array if the array is of size 1. */
2598 if (ref->u.ar.as != NULL
2599 && ref->u.ar.as->rank == 1
2600 && ref->u.ar.as->type == AS_EXPLICIT
2601 && ref->u.ar.as->lower[0] != NULL
2602 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2603 && ref->u.ar.as->upper[0] != NULL
2604 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2606 /* If we have a character string, we need to check if
2607 its length is one. */
2608 if (expr->ts.type == BT_CHARACTER)
2610 if (expr->ts.u.cl == NULL
2611 || expr->ts.u.cl->length == NULL
2612 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2618 /* We have constant lower and upper bounds. If the
2619 difference between is 1, it can be considered a
2621 FIXME: Use gfc_dep_compare_expr instead. */
2622 start = (int) mpz_get_si
2623 (ref->u.ar.as->lower[0]->value.integer);
2624 end = (int) mpz_get_si
2625 (ref->u.ar.as->upper[0]->value.integer);
2626 if (end - start + 1 != 1)
2641 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2643 /* Character string. Make sure it's of length 1. */
2644 if (expr->ts.u.cl == NULL
2645 || expr->ts.u.cl->length == NULL
2646 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2649 else if (expr->rank != 0)
2656 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2657 and, in the case of c_associated, set the binding label based on
2661 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2662 gfc_symbol **new_sym)
2664 char name[GFC_MAX_SYMBOL_LEN + 1];
2665 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2666 int optional_arg = 0;
2667 gfc_try retval = SUCCESS;
2668 gfc_symbol *args_sym;
2669 gfc_typespec *arg_ts;
2670 symbol_attribute arg_attr;
2672 if (args->expr->expr_type == EXPR_CONSTANT
2673 || args->expr->expr_type == EXPR_OP
2674 || args->expr->expr_type == EXPR_NULL)
2676 gfc_error ("Argument to '%s' at %L is not a variable",
2677 sym->name, &(args->expr->where));
2681 args_sym = args->expr->symtree->n.sym;
2683 /* The typespec for the actual arg should be that stored in the expr
2684 and not necessarily that of the expr symbol (args_sym), because
2685 the actual expression could be a part-ref of the expr symbol. */
2686 arg_ts = &(args->expr->ts);
2687 arg_attr = gfc_expr_attr (args->expr);
2689 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2691 /* If the user gave two args then they are providing something for
2692 the optional arg (the second cptr). Therefore, set the name and
2693 binding label to the c_associated for two cptrs. Otherwise,
2694 set c_associated to expect one cptr. */
2698 sprintf (name, "%s_2", sym->name);
2699 sprintf (binding_label, "%s_2", sym->binding_label);
2705 sprintf (name, "%s_1", sym->name);
2706 sprintf (binding_label, "%s_1", sym->binding_label);
2710 /* Get a new symbol for the version of c_associated that
2712 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2714 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2715 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2717 sprintf (name, "%s", sym->name);
2718 sprintf (binding_label, "%s", sym->binding_label);
2720 /* Error check the call. */
2721 if (args->next != NULL)
2723 gfc_error_now ("More actual than formal arguments in '%s' "
2724 "call at %L", name, &(args->expr->where));
2727 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2732 /* Make sure we have either the target or pointer attribute. */
2733 if (!arg_attr.target && !arg_attr.pointer)
2735 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2736 "a TARGET or an associated pointer",
2738 sym->name, &(args->expr->where));
2742 if (gfc_is_coindexed (args->expr))
2744 gfc_error_now ("Coindexed argument not permitted"
2745 " in '%s' call at %L", name,
2746 &(args->expr->where));
2750 /* Follow references to make sure there are no array
2752 seen_section = false;
2754 for (ref=args->expr->ref; ref; ref = ref->next)
2756 if (ref->type == REF_ARRAY)
2758 if (ref->u.ar.type == AR_SECTION)
2759 seen_section = true;
2761 if (ref->u.ar.type != AR_ELEMENT)
2764 for (r = ref->next; r; r=r->next)
2765 if (r->type == REF_COMPONENT)
2767 gfc_error_now ("Array section not permitted"
2768 " in '%s' call at %L", name,
2769 &(args->expr->where));
2777 if (seen_section && retval == SUCCESS)
2778 gfc_warning ("Array section in '%s' call at %L", name,
2779 &(args->expr->where));
2781 /* See if we have interoperable type and type param. */
2782 if (verify_c_interop (arg_ts) == SUCCESS
2783 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2785 if (args_sym->attr.target == 1)
2787 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2788 has the target attribute and is interoperable. */
2789 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2790 allocatable variable that has the TARGET attribute and
2791 is not an array of zero size. */
2792 if (args_sym->attr.allocatable == 1)
2794 if (args_sym->attr.dimension != 0
2795 && (args_sym->as && args_sym->as->rank == 0))
2797 gfc_error_now ("Allocatable variable '%s' used as a "
2798 "parameter to '%s' at %L must not be "
2799 "an array of zero size",
2800 args_sym->name, sym->name,
2801 &(args->expr->where));
2807 /* A non-allocatable target variable with C
2808 interoperable type and type parameters must be
2810 if (args_sym && args_sym->attr.dimension)
2812 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2814 gfc_error ("Assumed-shape array '%s' at %L "
2815 "cannot be an argument to the "
2816 "procedure '%s' because "
2817 "it is not C interoperable",
2819 &(args->expr->where), sym->name);
2822 else if (args_sym->as->type == AS_DEFERRED)
2824 gfc_error ("Deferred-shape array '%s' at %L "
2825 "cannot be an argument to the "
2826 "procedure '%s' because "
2827 "it is not C interoperable",
2829 &(args->expr->where), sym->name);
2834 /* Make sure it's not a character string. Arrays of
2835 any type should be ok if the variable is of a C
2836 interoperable type. */
2837 if (arg_ts->type == BT_CHARACTER)
2838 if (arg_ts->u.cl != NULL
2839 && (arg_ts->u.cl->length == NULL
2840 || arg_ts->u.cl->length->expr_type
2843 (arg_ts->u.cl->length->value.integer, 1)
2845 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2847 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2848 "at %L must have a length of 1",
2849 args_sym->name, sym->name,
2850 &(args->expr->where));
2855 else if (arg_attr.pointer
2856 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2858 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2860 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2861 "associated scalar POINTER", args_sym->name,
2862 sym->name, &(args->expr->where));
2868 /* The parameter is not required to be C interoperable. If it
2869 is not C interoperable, it must be a nonpolymorphic scalar
2870 with no length type parameters. It still must have either
2871 the pointer or target attribute, and it can be
2872 allocatable (but must be allocated when c_loc is called). */
2873 if (args->expr->rank != 0
2874 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2876 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2877 "scalar", args_sym->name, sym->name,
2878 &(args->expr->where));
2881 else if (arg_ts->type == BT_CHARACTER
2882 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2884 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2885 "%L must have a length of 1",
2886 args_sym->name, sym->name,
2887 &(args->expr->where));
2890 else if (arg_ts->type == BT_CLASS)
2892 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2893 "polymorphic", args_sym->name, sym->name,
2894 &(args->expr->where));
2899 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2901 if (args_sym->attr.flavor != FL_PROCEDURE)
2903 /* TODO: Update this error message to allow for procedure
2904 pointers once they are implemented. */
2905 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2907 args_sym->name, sym->name,
2908 &(args->expr->where));
2911 else if (args_sym->attr.is_bind_c != 1)
2913 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2915 args_sym->name, sym->name,
2916 &(args->expr->where));
2921 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2926 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2927 "iso_c_binding function: '%s'!\n", sym->name);
2934 /* Resolve a function call, which means resolving the arguments, then figuring
2935 out which entity the name refers to. */
2938 resolve_function (gfc_expr *expr)
2940 gfc_actual_arglist *arg;
2945 procedure_type p = PROC_INTRINSIC;
2946 bool no_formal_args;
2950 sym = expr->symtree->n.sym;
2952 /* If this is a procedure pointer component, it has already been resolved. */
2953 if (gfc_is_proc_ptr_comp (expr, NULL))
2956 if (sym && sym->attr.intrinsic
2957 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2960 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2962 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2966 /* If this ia a deferred TBP with an abstract interface (which may
2967 of course be referenced), expr->value.function.esym will be set. */
2968 if (sym && sym->attr.abstract && !expr->value.function.esym)
2970 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2971 sym->name, &expr->where);
2975 /* Switch off assumed size checking and do this again for certain kinds
2976 of procedure, once the procedure itself is resolved. */
2977 need_full_assumed_size++;
2979 if (expr->symtree && expr->symtree->n.sym)
2980 p = expr->symtree->n.sym->attr.proc;
2982 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2983 inquiry_argument = true;
2984 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2986 if (resolve_actual_arglist (expr->value.function.actual,
2987 p, no_formal_args) == FAILURE)
2989 inquiry_argument = false;
2993 inquiry_argument = false;
2995 /* Need to setup the call to the correct c_associated, depending on
2996 the number of cptrs to user gives to compare. */
2997 if (sym && sym->attr.is_iso_c == 1)
2999 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
3003 /* Get the symtree for the new symbol (resolved func).
3004 the old one will be freed later, when it's no longer used. */
3005 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
3008 /* Resume assumed_size checking. */
3009 need_full_assumed_size--;
3011 /* If the procedure is external, check for usage. */
3012 if (sym && is_external_proc (sym))
3013 resolve_global_procedure (sym, &expr->where,
3014 &expr->value.function.actual, 0);
3016 if (sym && sym->ts.type == BT_CHARACTER
3018 && sym->ts.u.cl->length == NULL
3020 && !sym->ts.deferred
3021 && expr->value.function.esym == NULL
3022 && !sym->attr.contained)
3024 /* Internal procedures are taken care of in resolve_contained_fntype. */
3025 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
3026 "be used at %L since it is not a dummy argument",
3027 sym->name, &expr->where);
3031 /* See if function is already resolved. */
3033 if (expr->value.function.name != NULL)
3035 if (expr->ts.type == BT_UNKNOWN)
3041 /* Apply the rules of section 14.1.2. */
3043 switch (procedure_kind (sym))
3046 t = resolve_generic_f (expr);
3049 case PTYPE_SPECIFIC:
3050 t = resolve_specific_f (expr);
3054 t = resolve_unknown_f (expr);
3058 gfc_internal_error ("resolve_function(): bad function type");
3062 /* If the expression is still a function (it might have simplified),
3063 then we check to see if we are calling an elemental function. */
3065 if (expr->expr_type != EXPR_FUNCTION)
3068 temp = need_full_assumed_size;
3069 need_full_assumed_size = 0;
3071 if (resolve_elemental_actual (expr, NULL) == FAILURE)
3074 if (omp_workshare_flag
3075 && expr->value.function.esym
3076 && ! gfc_elemental (expr->value.function.esym))
3078 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
3079 "in WORKSHARE construct", expr->value.function.esym->name,
3084 #define GENERIC_ID expr->value.function.isym->id
3085 else if (expr->value.function.actual != NULL
3086 && expr->value.function.isym != NULL
3087 && GENERIC_ID != GFC_ISYM_LBOUND
3088 && GENERIC_ID != GFC_ISYM_LEN
3089 && GENERIC_ID != GFC_ISYM_LOC
3090 && GENERIC_ID != GFC_ISYM_PRESENT)
3092 /* Array intrinsics must also have the last upper bound of an
3093 assumed size array argument. UBOUND and SIZE have to be
3094 excluded from the check if the second argument is anything
3097 for (arg = expr->value.function.actual; arg; arg = arg->next)
3099 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
3100 && arg->next != NULL && arg->next->expr)
3102 if (arg->next->expr->expr_type != EXPR_CONSTANT)
3105 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
3108 if ((int)mpz_get_si (arg->next->expr->value.integer)
3113 if (arg->expr != NULL
3114 && arg->expr->rank > 0
3115 && resolve_assumed_size_actual (arg->expr))
3121 need_full_assumed_size = temp;
3124 if (!pure_function (expr, &name) && name)
3128 gfc_error ("reference to non-PURE function '%s' at %L inside a "
3129 "FORALL %s", name, &expr->where,
3130 forall_flag == 2 ? "mask" : "block");
3133 else if (gfc_pure (NULL))
3135 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
3136 "procedure within a PURE procedure", name, &expr->where);
3141 if (!pure_function (expr, &name) && name && gfc_implicit_pure (NULL))
3142 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3144 /* Functions without the RECURSIVE attribution are not allowed to
3145 * call themselves. */
3146 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
3149 esym = expr->value.function.esym;
3151 if (is_illegal_recursion (esym, gfc_current_ns))
3153 if (esym->attr.entry && esym->ns->entries)
3154 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3155 " function '%s' is not RECURSIVE",
3156 esym->name, &expr->where, esym->ns->entries->sym->name);
3158 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
3159 " is not RECURSIVE", esym->name, &expr->where);
3165 /* Character lengths of use associated functions may contains references to
3166 symbols not referenced from the current program unit otherwise. Make sure
3167 those symbols are marked as referenced. */
3169 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
3170 && expr->value.function.esym->attr.use_assoc)
3172 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
3175 /* Make sure that the expression has a typespec that works. */
3176 if (expr->ts.type == BT_UNKNOWN)
3178 if (expr->symtree->n.sym->result
3179 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
3180 && !expr->symtree->n.sym->result->attr.proc_pointer)
3181 expr->ts = expr->symtree->n.sym->result->ts;
3188 /************* Subroutine resolution *************/
3191 pure_subroutine (gfc_code *c, gfc_symbol *sym)
3197 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
3198 sym->name, &c->loc);
3199 else if (gfc_pure (NULL))
3200 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
3206 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
3210 if (sym->attr.generic)
3212 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
3215 c->resolved_sym = s;
3216 pure_subroutine (c, s);
3220 /* TODO: Need to search for elemental references in generic interface. */
3223 if (sym->attr.intrinsic)
3224 return gfc_intrinsic_sub_interface (c, 0);
3231 resolve_generic_s (gfc_code *c)
3236 sym = c->symtree->n.sym;
3240 m = resolve_generic_s0 (c, sym);
3243 else if (m == MATCH_ERROR)
3247 if (sym->ns->parent == NULL)
3249 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3253 if (!generic_sym (sym))
3257 /* Last ditch attempt. See if the reference is to an intrinsic
3258 that possesses a matching interface. 14.1.2.4 */
3259 sym = c->symtree->n.sym;
3261 if (!gfc_is_intrinsic (sym, 1, c->loc))
3263 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3264 sym->name, &c->loc);
3268 m = gfc_intrinsic_sub_interface (c, 0);
3272 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3273 "intrinsic subroutine interface", sym->name, &c->loc);
3279 /* Set the name and binding label of the subroutine symbol in the call
3280 expression represented by 'c' to include the type and kind of the
3281 second parameter. This function is for resolving the appropriate
3282 version of c_f_pointer() and c_f_procpointer(). For example, a
3283 call to c_f_pointer() for a default integer pointer could have a
3284 name of c_f_pointer_i4. If no second arg exists, which is an error
3285 for these two functions, it defaults to the generic symbol's name
3286 and binding label. */
3289 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3290 char *name, char *binding_label)
3292 gfc_expr *arg = NULL;
3296 /* The second arg of c_f_pointer and c_f_procpointer determines
3297 the type and kind for the procedure name. */
3298 arg = c->ext.actual->next->expr;
3302 /* Set up the name to have the given symbol's name,
3303 plus the type and kind. */
3304 /* a derived type is marked with the type letter 'u' */
3305 if (arg->ts.type == BT_DERIVED)
3308 kind = 0; /* set the kind as 0 for now */
3312 type = gfc_type_letter (arg->ts.type);
3313 kind = arg->ts.kind;
3316 if (arg->ts.type == BT_CHARACTER)
3317 /* Kind info for character strings not needed. */
3320 sprintf (name, "%s_%c%d", sym->name, type, kind);
3321 /* Set up the binding label as the given symbol's label plus
3322 the type and kind. */
3323 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3327 /* If the second arg is missing, set the name and label as
3328 was, cause it should at least be found, and the missing
3329 arg error will be caught by compare_parameters(). */
3330 sprintf (name, "%s", sym->name);
3331 sprintf (binding_label, "%s", sym->binding_label);
3338 /* Resolve a generic version of the iso_c_binding procedure given
3339 (sym) to the specific one based on the type and kind of the
3340 argument(s). Currently, this function resolves c_f_pointer() and
3341 c_f_procpointer based on the type and kind of the second argument
3342 (FPTR). Other iso_c_binding procedures aren't specially handled.
3343 Upon successfully exiting, c->resolved_sym will hold the resolved
3344 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3348 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3350 gfc_symbol *new_sym;
3351 /* this is fine, since we know the names won't use the max */
3352 char name[GFC_MAX_SYMBOL_LEN + 1];
3353 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3354 /* default to success; will override if find error */
3355 match m = MATCH_YES;
3357 /* Make sure the actual arguments are in the necessary order (based on the
3358 formal args) before resolving. */
3359 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3361 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3362 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3364 set_name_and_label (c, sym, name, binding_label);
3366 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3368 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3370 /* Make sure we got a third arg if the second arg has non-zero
3371 rank. We must also check that the type and rank are
3372 correct since we short-circuit this check in
3373 gfc_procedure_use() (called above to sort actual args). */
3374 if (c->ext.actual->next->expr->rank != 0)
3376 if(c->ext.actual->next->next == NULL
3377 || c->ext.actual->next->next->expr == NULL)
3380 gfc_error ("Missing SHAPE parameter for call to %s "
3381 "at %L", sym->name, &(c->loc));
3383 else if (c->ext.actual->next->next->expr->ts.type
3385 || c->ext.actual->next->next->expr->rank != 1)
3388 gfc_error ("SHAPE parameter for call to %s at %L must "
3389 "be a rank 1 INTEGER array", sym->name,
3396 if (m != MATCH_ERROR)
3398 /* the 1 means to add the optional arg to formal list */
3399 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3401 /* for error reporting, say it's declared where the original was */
3402 new_sym->declared_at = sym->declared_at;
3407 /* no differences for c_loc or c_funloc */
3411 /* set the resolved symbol */
3412 if (m != MATCH_ERROR)
3413 c->resolved_sym = new_sym;
3415 c->resolved_sym = sym;
3421 /* Resolve a subroutine call known to be specific. */
3424 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3428 if(sym->attr.is_iso_c)
3430 m = gfc_iso_c_sub_interface (c,sym);
3434 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3436 if (sym->attr.dummy)
3438 sym->attr.proc = PROC_DUMMY;
3442 sym->attr.proc = PROC_EXTERNAL;
3446 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3449 if (sym->attr.intrinsic)
3451 m = gfc_intrinsic_sub_interface (c, 1);
3455 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3456 "with an intrinsic", sym->name, &c->loc);
3464 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3466 c->resolved_sym = sym;
3467 pure_subroutine (c, sym);
3474 resolve_specific_s (gfc_code *c)
3479 sym = c->symtree->n.sym;
3483 m = resolve_specific_s0 (c, sym);
3486 if (m == MATCH_ERROR)
3489 if (sym->ns->parent == NULL)
3492 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3498 sym = c->symtree->n.sym;
3499 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3500 sym->name, &c->loc);
3506 /* Resolve a subroutine call not known to be generic nor specific. */
3509 resolve_unknown_s (gfc_code *c)
3513 sym = c->symtree->n.sym;
3515 if (sym->attr.dummy)
3517 sym->attr.proc = PROC_DUMMY;
3521 /* See if we have an intrinsic function reference. */
3523 if (gfc_is_intrinsic (sym, 1, c->loc))
3525 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3530 /* The reference is to an external name. */
3533 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3535 c->resolved_sym = sym;
3537 pure_subroutine (c, sym);
3543 /* Resolve a subroutine call. Although it was tempting to use the same code
3544 for functions, subroutines and functions are stored differently and this
3545 makes things awkward. */
3548 resolve_call (gfc_code *c)
3551 procedure_type ptype = PROC_INTRINSIC;
3552 gfc_symbol *csym, *sym;
3553 bool no_formal_args;
3555 csym = c->symtree ? c->symtree->n.sym : NULL;
3557 if (csym && csym->ts.type != BT_UNKNOWN)
3559 gfc_error ("'%s' at %L has a type, which is not consistent with "
3560 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3564 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3567 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3568 sym = st ? st->n.sym : NULL;
3569 if (sym && csym != sym
3570 && sym->ns == gfc_current_ns
3571 && sym->attr.flavor == FL_PROCEDURE
3572 && sym->attr.contained)
3575 if (csym->attr.generic)
3576 c->symtree->n.sym = sym;
3579 csym = c->symtree->n.sym;
3583 /* If this ia a deferred TBP with an abstract interface
3584 (which may of course be referenced), c->expr1 will be set. */
3585 if (csym && csym->attr.abstract && !c->expr1)
3587 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3588 csym->name, &c->loc);
3592 /* Subroutines without the RECURSIVE attribution are not allowed to
3593 * call themselves. */
3594 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3596 if (csym->attr.entry && csym->ns->entries)
3597 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3598 " subroutine '%s' is not RECURSIVE",
3599 csym->name, &c->loc, csym->ns->entries->sym->name);
3601 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3602 " is not RECURSIVE", csym->name, &c->loc);
3607 /* Switch off assumed size checking and do this again for certain kinds
3608 of procedure, once the procedure itself is resolved. */
3609 need_full_assumed_size++;
3612 ptype = csym->attr.proc;
3614 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3615 if (resolve_actual_arglist (c->ext.actual, ptype,
3616 no_formal_args) == FAILURE)
3619 /* Resume assumed_size checking. */
3620 need_full_assumed_size--;
3622 /* If external, check for usage. */
3623 if (csym && is_external_proc (csym))
3624 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3627 if (c->resolved_sym == NULL)
3629 c->resolved_isym = NULL;
3630 switch (procedure_kind (csym))
3633 t = resolve_generic_s (c);
3636 case PTYPE_SPECIFIC:
3637 t = resolve_specific_s (c);
3641 t = resolve_unknown_s (c);
3645 gfc_internal_error ("resolve_subroutine(): bad function type");
3649 /* Some checks of elemental subroutine actual arguments. */
3650 if (resolve_elemental_actual (NULL, c) == FAILURE)
3657 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3658 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3659 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3660 if their shapes do not match. If either op1->shape or op2->shape is
3661 NULL, return SUCCESS. */
3664 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3671 if (op1->shape != NULL && op2->shape != NULL)
3673 for (i = 0; i < op1->rank; i++)
3675 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3677 gfc_error ("Shapes for operands at %L and %L are not conformable",
3678 &op1->where, &op2->where);
3689 /* Resolve an operator expression node. This can involve replacing the
3690 operation with a user defined function call. */
3693 resolve_operator (gfc_expr *e)
3695 gfc_expr *op1, *op2;
3697 bool dual_locus_error;
3700 /* Resolve all subnodes-- give them types. */
3702 switch (e->value.op.op)
3705 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3708 /* Fall through... */
3711 case INTRINSIC_UPLUS:
3712 case INTRINSIC_UMINUS:
3713 case INTRINSIC_PARENTHESES:
3714 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3719 /* Typecheck the new node. */
3721 op1 = e->value.op.op1;
3722 op2 = e->value.op.op2;
3723 dual_locus_error = false;
3725 if ((op1 && op1->expr_type == EXPR_NULL)
3726 || (op2 && op2->expr_type == EXPR_NULL))
3728 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3732 switch (e->value.op.op)
3734 case INTRINSIC_UPLUS:
3735 case INTRINSIC_UMINUS:
3736 if (op1->ts.type == BT_INTEGER
3737 || op1->ts.type == BT_REAL
3738 || op1->ts.type == BT_COMPLEX)
3744 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3745 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3748 case INTRINSIC_PLUS:
3749 case INTRINSIC_MINUS:
3750 case INTRINSIC_TIMES:
3751 case INTRINSIC_DIVIDE:
3752 case INTRINSIC_POWER:
3753 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3755 gfc_type_convert_binary (e, 1);
3760 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3761 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3762 gfc_typename (&op2->ts));
3765 case INTRINSIC_CONCAT:
3766 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3767 && op1->ts.kind == op2->ts.kind)
3769 e->ts.type = BT_CHARACTER;
3770 e->ts.kind = op1->ts.kind;
3775 _("Operands of string concatenation operator at %%L are %s/%s"),
3776 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3782 case INTRINSIC_NEQV:
3783 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3785 e->ts.type = BT_LOGICAL;
3786 e->ts.kind = gfc_kind_max (op1, op2);
3787 if (op1->ts.kind < e->ts.kind)
3788 gfc_convert_type (op1, &e->ts, 2);
3789 else if (op2->ts.kind < e->ts.kind)
3790 gfc_convert_type (op2, &e->ts, 2);
3794 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3795 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3796 gfc_typename (&op2->ts));
3801 if (op1->ts.type == BT_LOGICAL)
3803 e->ts.type = BT_LOGICAL;
3804 e->ts.kind = op1->ts.kind;
3808 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3809 gfc_typename (&op1->ts));
3813 case INTRINSIC_GT_OS:
3815 case INTRINSIC_GE_OS:
3817 case INTRINSIC_LT_OS:
3819 case INTRINSIC_LE_OS:
3820 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3822 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3826 /* Fall through... */
3829 case INTRINSIC_EQ_OS:
3831 case INTRINSIC_NE_OS:
3832 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3833 && op1->ts.kind == op2->ts.kind)
3835 e->ts.type = BT_LOGICAL;
3836 e->ts.kind = gfc_default_logical_kind;
3840 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3842 gfc_type_convert_binary (e, 1);
3844 e->ts.type = BT_LOGICAL;
3845 e->ts.kind = gfc_default_logical_kind;
3849 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3851 _("Logicals at %%L must be compared with %s instead of %s"),
3852 (e->value.op.op == INTRINSIC_EQ
3853 || e->value.op.op == INTRINSIC_EQ_OS)
3854 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3857 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3858 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3859 gfc_typename (&op2->ts));
3863 case INTRINSIC_USER:
3864 if (e->value.op.uop->op == NULL)
3865 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3866 else if (op2 == NULL)
3867 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3868 e->value.op.uop->name, gfc_typename (&op1->ts));
3871 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3872 e->value.op.uop->name, gfc_typename (&op1->ts),
3873 gfc_typename (&op2->ts));
3874 e->value.op.uop->op->sym->attr.referenced = 1;
3879 case INTRINSIC_PARENTHESES:
3881 if (e->ts.type == BT_CHARACTER)
3882 e->ts.u.cl = op1->ts.u.cl;
3886 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3889 /* Deal with arrayness of an operand through an operator. */
3893 switch (e->value.op.op)
3895 case INTRINSIC_PLUS:
3896 case INTRINSIC_MINUS:
3897 case INTRINSIC_TIMES:
3898 case INTRINSIC_DIVIDE:
3899 case INTRINSIC_POWER:
3900 case INTRINSIC_CONCAT:
3904 case INTRINSIC_NEQV:
3906 case INTRINSIC_EQ_OS:
3908 case INTRINSIC_NE_OS:
3910 case INTRINSIC_GT_OS:
3912 case INTRINSIC_GE_OS:
3914 case INTRINSIC_LT_OS:
3916 case INTRINSIC_LE_OS:
3918 if (op1->rank == 0 && op2->rank == 0)
3921 if (op1->rank == 0 && op2->rank != 0)
3923 e->rank = op2->rank;
3925 if (e->shape == NULL)
3926 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3929 if (op1->rank != 0 && op2->rank == 0)
3931 e->rank = op1->rank;
3933 if (e->shape == NULL)
3934 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3937 if (op1->rank != 0 && op2->rank != 0)
3939 if (op1->rank == op2->rank)
3941 e->rank = op1->rank;
3942 if (e->shape == NULL)
3944 t = compare_shapes (op1, op2);
3948 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3953 /* Allow higher level expressions to work. */
3956 /* Try user-defined operators, and otherwise throw an error. */
3957 dual_locus_error = true;
3959 _("Inconsistent ranks for operator at %%L and %%L"));
3966 case INTRINSIC_PARENTHESES:
3968 case INTRINSIC_UPLUS:
3969 case INTRINSIC_UMINUS:
3970 /* Simply copy arrayness attribute */
3971 e->rank = op1->rank;
3973 if (e->shape == NULL)
3974 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3982 /* Attempt to simplify the expression. */
3985 t = gfc_simplify_expr (e, 0);
3986 /* Some calls do not succeed in simplification and return FAILURE
3987 even though there is no error; e.g. variable references to
3988 PARAMETER arrays. */
3989 if (!gfc_is_constant_expr (e))
3998 if (gfc_extend_expr (e, &real_error) == SUCCESS)
4005 if (dual_locus_error)
4006 gfc_error (msg, &op1->where, &op2->where);
4008 gfc_error (msg, &e->where);
4014 /************** Array resolution subroutines **************/
4017 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
4020 /* Compare two integer expressions. */
4023 compare_bound (gfc_expr *a, gfc_expr *b)
4027 if (a == NULL || a->expr_type != EXPR_CONSTANT
4028 || b == NULL || b->expr_type != EXPR_CONSTANT)
4031 /* If either of the types isn't INTEGER, we must have
4032 raised an error earlier. */
4034 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
4037 i = mpz_cmp (a->value.integer, b->value.integer);
4047 /* Compare an integer expression with an integer. */
4050 compare_bound_int (gfc_expr *a, int b)
4054 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4057 if (a->ts.type != BT_INTEGER)
4058 gfc_internal_error ("compare_bound_int(): Bad expression");
4060 i = mpz_cmp_si (a->value.integer, b);
4070 /* Compare an integer expression with a mpz_t. */
4073 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
4077 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4080 if (a->ts.type != BT_INTEGER)
4081 gfc_internal_error ("compare_bound_int(): Bad expression");
4083 i = mpz_cmp (a->value.integer, b);
4093 /* Compute the last value of a sequence given by a triplet.
4094 Return 0 if it wasn't able to compute the last value, or if the
4095 sequence if empty, and 1 otherwise. */
4098 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
4099 gfc_expr *stride, mpz_t last)
4103 if (start == NULL || start->expr_type != EXPR_CONSTANT
4104 || end == NULL || end->expr_type != EXPR_CONSTANT
4105 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
4108 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
4109 || (stride != NULL && stride->ts.type != BT_INTEGER))
4112 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
4114 if (compare_bound (start, end) == CMP_GT)
4116 mpz_set (last, end->value.integer);
4120 if (compare_bound_int (stride, 0) == CMP_GT)
4122 /* Stride is positive */
4123 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
4128 /* Stride is negative */
4129 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
4134 mpz_sub (rem, end->value.integer, start->value.integer);
4135 mpz_tdiv_r (rem, rem, stride->value.integer);
4136 mpz_sub (last, end->value.integer, rem);
4143 /* Compare a single dimension of an array reference to the array
4147 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
4151 if (ar->dimen_type[i] == DIMEN_STAR)
4153 gcc_assert (ar->stride[i] == NULL);
4154 /* This implies [*] as [*:] and [*:3] are not possible. */
4155 if (ar->start[i] == NULL)
4157 gcc_assert (ar->end[i] == NULL);
4162 /* Given start, end and stride values, calculate the minimum and
4163 maximum referenced indexes. */
4165 switch (ar->dimen_type[i])
4168 case DIMEN_THIS_IMAGE:
4173 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
4176 gfc_warning ("Array reference at %L is out of bounds "
4177 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4178 mpz_get_si (ar->start[i]->value.integer),
4179 mpz_get_si (as->lower[i]->value.integer), i+1);
4181 gfc_warning ("Array reference at %L is out of bounds "
4182 "(%ld < %ld) in codimension %d", &ar->c_where[i],
4183 mpz_get_si (ar->start[i]->value.integer),
4184 mpz_get_si (as->lower[i]->value.integer),
4188 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
4191 gfc_warning ("Array reference at %L is out of bounds "
4192 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4193 mpz_get_si (ar->start[i]->value.integer),
4194 mpz_get_si (as->upper[i]->value.integer), i+1);
4196 gfc_warning ("Array reference at %L is out of bounds "
4197 "(%ld > %ld) in codimension %d", &ar->c_where[i],
4198 mpz_get_si (ar->start[i]->value.integer),
4199 mpz_get_si (as->upper[i]->value.integer),
4208 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
4209 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
4211 comparison comp_start_end = compare_bound (AR_START, AR_END);
4213 /* Check for zero stride, which is not allowed. */
4214 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
4216 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
4220 /* if start == len || (stride > 0 && start < len)
4221 || (stride < 0 && start > len),
4222 then the array section contains at least one element. In this
4223 case, there is an out-of-bounds access if
4224 (start < lower || start > upper). */
4225 if (compare_bound (AR_START, AR_END) == CMP_EQ
4226 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
4227 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
4228 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
4229 && comp_start_end == CMP_GT))
4231 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
4233 gfc_warning ("Lower array reference at %L is out of bounds "
4234 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4235 mpz_get_si (AR_START->value.integer),
4236 mpz_get_si (as->lower[i]->value.integer), i+1);
4239 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4241 gfc_warning ("Lower array reference at %L is out of bounds "
4242 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4243 mpz_get_si (AR_START->value.integer),
4244 mpz_get_si (as->upper[i]->value.integer), i+1);
4249 /* If we can compute the highest index of the array section,
4250 then it also has to be between lower and upper. */
4251 mpz_init (last_value);
4252 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4255 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4257 gfc_warning ("Upper array reference at %L is out of bounds "
4258 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4259 mpz_get_si (last_value),
4260 mpz_get_si (as->lower[i]->value.integer), i+1);
4261 mpz_clear (last_value);
4264 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4266 gfc_warning ("Upper array reference at %L is out of bounds "
4267 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4268 mpz_get_si (last_value),
4269 mpz_get_si (as->upper[i]->value.integer), i+1);
4270 mpz_clear (last_value);
4274 mpz_clear (last_value);
4282 gfc_internal_error ("check_dimension(): Bad array reference");
4289 /* Compare an array reference with an array specification. */
4292 compare_spec_to_ref (gfc_array_ref *ar)
4299 /* TODO: Full array sections are only allowed as actual parameters. */
4300 if (as->type == AS_ASSUMED_SIZE
4301 && (/*ar->type == AR_FULL
4302 ||*/ (ar->type == AR_SECTION
4303 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4305 gfc_error ("Rightmost upper bound of assumed size array section "
4306 "not specified at %L", &ar->where);
4310 if (ar->type == AR_FULL)
4313 if (as->rank != ar->dimen)
4315 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4316 &ar->where, ar->dimen, as->rank);
4320 /* ar->codimen == 0 is a local array. */
4321 if (as->corank != ar->codimen && ar->codimen != 0)
4323 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4324 &ar->where, ar->codimen, as->corank);
4328 for (i = 0; i < as->rank; i++)
4329 if (check_dimension (i, ar, as) == FAILURE)
4332 /* Local access has no coarray spec. */
4333 if (ar->codimen != 0)
4334 for (i = as->rank; i < as->rank + as->corank; i++)
4336 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate
4337 && ar->dimen_type[i] != DIMEN_THIS_IMAGE)
4339 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4340 i + 1 - as->rank, &ar->where);
4343 if (check_dimension (i, ar, as) == FAILURE)
4347 if (as->corank && ar->codimen == 0)
4350 ar->codimen = as->corank;
4351 for (n = ar->dimen; n < ar->dimen + ar->codimen; n++)
4352 ar->dimen_type[n] = DIMEN_THIS_IMAGE;
4359 /* Resolve one part of an array index. */
4362 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4363 int force_index_integer_kind)
4370 if (gfc_resolve_expr (index) == FAILURE)
4373 if (check_scalar && index->rank != 0)
4375 gfc_error ("Array index at %L must be scalar", &index->where);
4379 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4381 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4382 &index->where, gfc_basic_typename (index->ts.type));
4386 if (index->ts.type == BT_REAL)
4387 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4388 &index->where) == FAILURE)
4391 if ((index->ts.kind != gfc_index_integer_kind
4392 && force_index_integer_kind)
4393 || index->ts.type != BT_INTEGER)
4396 ts.type = BT_INTEGER;
4397 ts.kind = gfc_index_integer_kind;
4399 gfc_convert_type_warn (index, &ts, 2, 0);
4405 /* Resolve one part of an array index. */
4408 gfc_resolve_index (gfc_expr *index, int check_scalar)
4410 return gfc_resolve_index_1 (index, check_scalar, 1);
4413 /* Resolve a dim argument to an intrinsic function. */
4416 gfc_resolve_dim_arg (gfc_expr *dim)
4421 if (gfc_resolve_expr (dim) == FAILURE)
4426 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4431 if (dim->ts.type != BT_INTEGER)
4433 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4437 if (dim->ts.kind != gfc_index_integer_kind)
4442 ts.type = BT_INTEGER;
4443 ts.kind = gfc_index_integer_kind;
4445 gfc_convert_type_warn (dim, &ts, 2, 0);
4451 /* Given an expression that contains array references, update those array
4452 references to point to the right array specifications. While this is
4453 filled in during matching, this information is difficult to save and load
4454 in a module, so we take care of it here.
4456 The idea here is that the original array reference comes from the
4457 base symbol. We traverse the list of reference structures, setting
4458 the stored reference to references. Component references can
4459 provide an additional array specification. */
4462 find_array_spec (gfc_expr *e)
4466 gfc_symbol *derived;
4469 if (e->symtree->n.sym->ts.type == BT_CLASS)
4470 as = CLASS_DATA (e->symtree->n.sym)->as;
4472 as = e->symtree->n.sym->as;
4475 for (ref = e->ref; ref; ref = ref->next)
4480 gfc_internal_error ("find_array_spec(): Missing spec");
4487 if (derived == NULL)
4488 derived = e->symtree->n.sym->ts.u.derived;
4490 if (derived->attr.is_class)
4491 derived = derived->components->ts.u.derived;
4493 c = derived->components;
4495 for (; c; c = c->next)
4496 if (c == ref->u.c.component)
4498 /* Track the sequence of component references. */
4499 if (c->ts.type == BT_DERIVED)
4500 derived = c->ts.u.derived;
4505 gfc_internal_error ("find_array_spec(): Component not found");
4507 if (c->attr.dimension)
4510 gfc_internal_error ("find_array_spec(): unused as(1)");
4521 gfc_internal_error ("find_array_spec(): unused as(2)");
4525 /* Resolve an array reference. */
4528 resolve_array_ref (gfc_array_ref *ar)
4530 int i, check_scalar;
4533 for (i = 0; i < ar->dimen + ar->codimen; i++)
4535 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4537 /* Do not force gfc_index_integer_kind for the start. We can
4538 do fine with any integer kind. This avoids temporary arrays
4539 created for indexing with a vector. */
4540 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4542 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4544 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4549 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4553 ar->dimen_type[i] = DIMEN_ELEMENT;
4557 ar->dimen_type[i] = DIMEN_VECTOR;
4558 if (e->expr_type == EXPR_VARIABLE
4559 && e->symtree->n.sym->ts.type == BT_DERIVED)
4560 ar->start[i] = gfc_get_parentheses (e);
4564 gfc_error ("Array index at %L is an array of rank %d",
4565 &ar->c_where[i], e->rank);
4569 /* Fill in the upper bound, which may be lower than the
4570 specified one for something like a(2:10:5), which is
4571 identical to a(2:7:5). Only relevant for strides not equal
4572 to one. Don't try a division by zero. */
4573 if (ar->dimen_type[i] == DIMEN_RANGE
4574 && ar->stride[i] != NULL && ar->stride[i]->expr_type == EXPR_CONSTANT
4575 && mpz_cmp_si (ar->stride[i]->value.integer, 1L) != 0
4576 && mpz_cmp_si (ar->stride[i]->value.integer, 0L) != 0)
4580 if (gfc_ref_dimen_size (ar, i, &size, &end) == SUCCESS)
4582 if (ar->end[i] == NULL)
4585 gfc_get_constant_expr (BT_INTEGER, gfc_index_integer_kind,
4587 mpz_set (ar->end[i]->value.integer, end);
4589 else if (ar->end[i]->ts.type == BT_INTEGER
4590 && ar->end[i]->expr_type == EXPR_CONSTANT)
4592 mpz_set (ar->end[i]->value.integer, end);
4603 if (ar->type == AR_FULL && ar->as->rank == 0)
4604 ar->type = AR_ELEMENT;
4606 /* If the reference type is unknown, figure out what kind it is. */
4608 if (ar->type == AR_UNKNOWN)
4610 ar->type = AR_ELEMENT;
4611 for (i = 0; i < ar->dimen; i++)
4612 if (ar->dimen_type[i] == DIMEN_RANGE
4613 || ar->dimen_type[i] == DIMEN_VECTOR)
4615 ar->type = AR_SECTION;
4620 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4628 resolve_substring (gfc_ref *ref)
4630 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4632 if (ref->u.ss.start != NULL)
4634 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4637 if (ref->u.ss.start->ts.type != BT_INTEGER)
4639 gfc_error ("Substring start index at %L must be of type INTEGER",
4640 &ref->u.ss.start->where);
4644 if (ref->u.ss.start->rank != 0)
4646 gfc_error ("Substring start index at %L must be scalar",
4647 &ref->u.ss.start->where);
4651 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4652 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4653 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4655 gfc_error ("Substring start index at %L is less than one",
4656 &ref->u.ss.start->where);
4661 if (ref->u.ss.end != NULL)
4663 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4666 if (ref->u.ss.end->ts.type != BT_INTEGER)
4668 gfc_error ("Substring end index at %L must be of type INTEGER",
4669 &ref->u.ss.end->where);
4673 if (ref->u.ss.end->rank != 0)
4675 gfc_error ("Substring end index at %L must be scalar",
4676 &ref->u.ss.end->where);
4680 if (ref->u.ss.length != NULL
4681 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4682 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4683 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4685 gfc_error ("Substring end index at %L exceeds the string length",
4686 &ref->u.ss.start->where);
4690 if (compare_bound_mpz_t (ref->u.ss.end,
4691 gfc_integer_kinds[k].huge) == CMP_GT
4692 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4693 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4695 gfc_error ("Substring end index at %L is too large",
4696 &ref->u.ss.end->where);
4705 /* This function supplies missing substring charlens. */
4708 gfc_resolve_substring_charlen (gfc_expr *e)
4711 gfc_expr *start, *end;
4713 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4714 if (char_ref->type == REF_SUBSTRING)
4720 gcc_assert (char_ref->next == NULL);
4724 if (e->ts.u.cl->length)
4725 gfc_free_expr (e->ts.u.cl->length);
4726 else if (e->expr_type == EXPR_VARIABLE
4727 && e->symtree->n.sym->attr.dummy)
4731 e->ts.type = BT_CHARACTER;
4732 e->ts.kind = gfc_default_character_kind;
4735 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4737 if (char_ref->u.ss.start)
4738 start = gfc_copy_expr (char_ref->u.ss.start);
4740 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4742 if (char_ref->u.ss.end)
4743 end = gfc_copy_expr (char_ref->u.ss.end);
4744 else if (e->expr_type == EXPR_VARIABLE)
4745 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4752 /* Length = (end - start +1). */
4753 e->ts.u.cl->length = gfc_subtract (end, start);
4754 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4755 gfc_get_int_expr (gfc_default_integer_kind,
4758 e->ts.u.cl->length->ts.type = BT_INTEGER;
4759 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4761 /* Make sure that the length is simplified. */
4762 gfc_simplify_expr (e->ts.u.cl->length, 1);
4763 gfc_resolve_expr (e->ts.u.cl->length);
4767 /* Resolve subtype references. */
4770 resolve_ref (gfc_expr *expr)
4772 int current_part_dimension, n_components, seen_part_dimension;
4775 for (ref = expr->ref; ref; ref = ref->next)
4776 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4778 find_array_spec (expr);
4782 for (ref = expr->ref; ref; ref = ref->next)
4786 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4794 resolve_substring (ref);
4798 /* Check constraints on part references. */
4800 current_part_dimension = 0;
4801 seen_part_dimension = 0;
4804 for (ref = expr->ref; ref; ref = ref->next)
4809 switch (ref->u.ar.type)
4812 /* Coarray scalar. */
4813 if (ref->u.ar.as->rank == 0)
4815 current_part_dimension = 0;
4820 current_part_dimension = 1;
4824 current_part_dimension = 0;
4828 gfc_internal_error ("resolve_ref(): Bad array reference");
4834 if (current_part_dimension || seen_part_dimension)
4837 if (ref->u.c.component->attr.pointer
4838 || ref->u.c.component->attr.proc_pointer)
4840 gfc_error ("Component to the right of a part reference "
4841 "with nonzero rank must not have the POINTER "
4842 "attribute at %L", &expr->where);
4845 else if (ref->u.c.component->attr.allocatable)
4847 gfc_error ("Component to the right of a part reference "
4848 "with nonzero rank must not have the ALLOCATABLE "
4849 "attribute at %L", &expr->where);
4861 if (((ref->type == REF_COMPONENT && n_components > 1)
4862 || ref->next == NULL)
4863 && current_part_dimension
4864 && seen_part_dimension)
4866 gfc_error ("Two or more part references with nonzero rank must "
4867 "not be specified at %L", &expr->where);
4871 if (ref->type == REF_COMPONENT)
4873 if (current_part_dimension)
4874 seen_part_dimension = 1;
4876 /* reset to make sure */
4877 current_part_dimension = 0;
4885 /* Given an expression, determine its shape. This is easier than it sounds.
4886 Leaves the shape array NULL if it is not possible to determine the shape. */
4889 expression_shape (gfc_expr *e)
4891 mpz_t array[GFC_MAX_DIMENSIONS];
4894 if (e->rank == 0 || e->shape != NULL)
4897 for (i = 0; i < e->rank; i++)
4898 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4901 e->shape = gfc_get_shape (e->rank);
4903 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4908 for (i--; i >= 0; i--)
4909 mpz_clear (array[i]);
4913 /* Given a variable expression node, compute the rank of the expression by
4914 examining the base symbol and any reference structures it may have. */
4917 expression_rank (gfc_expr *e)
4922 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4923 could lead to serious confusion... */
4924 gcc_assert (e->expr_type != EXPR_COMPCALL);
4928 if (e->expr_type == EXPR_ARRAY)
4930 /* Constructors can have a rank different from one via RESHAPE(). */
4932 if (e->symtree == NULL)
4938 e->rank = (e->symtree->n.sym->as == NULL)
4939 ? 0 : e->symtree->n.sym->as->rank;
4945 for (ref = e->ref; ref; ref = ref->next)
4947 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.proc_pointer
4948 && ref->u.c.component->attr.function && !ref->next)
4949 rank = ref->u.c.component->as ? ref->u.c.component->as->rank : 0;
4951 if (ref->type != REF_ARRAY)
4954 if (ref->u.ar.type == AR_FULL)
4956 rank = ref->u.ar.as->rank;
4960 if (ref->u.ar.type == AR_SECTION)
4962 /* Figure out the rank of the section. */
4964 gfc_internal_error ("expression_rank(): Two array specs");
4966 for (i = 0; i < ref->u.ar.dimen; i++)
4967 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4968 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4978 expression_shape (e);
4982 /* Resolve a variable expression. */
4985 resolve_variable (gfc_expr *e)
4992 if (e->symtree == NULL)
4994 sym = e->symtree->n.sym;
4996 /* If this is an associate-name, it may be parsed with an array reference
4997 in error even though the target is scalar. Fail directly in this case. */
4998 if (sym->assoc && !sym->attr.dimension && e->ref && e->ref->type == REF_ARRAY)
5001 /* On the other hand, the parser may not have known this is an array;
5002 in this case, we have to add a FULL reference. */
5003 if (sym->assoc && sym->attr.dimension && !e->ref)
5005 e->ref = gfc_get_ref ();
5006 e->ref->type = REF_ARRAY;
5007 e->ref->u.ar.type = AR_FULL;
5008 e->ref->u.ar.dimen = 0;
5011 if (e->ref && resolve_ref (e) == FAILURE)
5014 if (sym->attr.flavor == FL_PROCEDURE
5015 && (!sym->attr.function
5016 || (sym->attr.function && sym->result
5017 && sym->result->attr.proc_pointer
5018 && !sym->result->attr.function)))
5020 e->ts.type = BT_PROCEDURE;
5021 goto resolve_procedure;
5024 if (sym->ts.type != BT_UNKNOWN)
5025 gfc_variable_attr (e, &e->ts);
5028 /* Must be a simple variable reference. */
5029 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
5034 if (check_assumed_size_reference (sym, e))
5037 /* Deal with forward references to entries during resolve_code, to
5038 satisfy, at least partially, 12.5.2.5. */
5039 if (gfc_current_ns->entries
5040 && current_entry_id == sym->entry_id
5043 && cs_base->current->op != EXEC_ENTRY)
5045 gfc_entry_list *entry;
5046 gfc_formal_arglist *formal;
5050 /* If the symbol is a dummy... */
5051 if (sym->attr.dummy && sym->ns == gfc_current_ns)
5053 entry = gfc_current_ns->entries;
5056 /* ...test if the symbol is a parameter of previous entries. */
5057 for (; entry && entry->id <= current_entry_id; entry = entry->next)
5058 for (formal = entry->sym->formal; formal; formal = formal->next)
5060 if (formal->sym && sym->name == formal->sym->name)
5064 /* If it has not been seen as a dummy, this is an error. */
5067 if (specification_expr)
5068 gfc_error ("Variable '%s', used in a specification expression"
5069 ", is referenced at %L before the ENTRY statement "
5070 "in which it is a parameter",
5071 sym->name, &cs_base->current->loc);
5073 gfc_error ("Variable '%s' is used at %L before the ENTRY "
5074 "statement in which it is a parameter",
5075 sym->name, &cs_base->current->loc);
5080 /* Now do the same check on the specification expressions. */
5081 specification_expr = 1;
5082 if (sym->ts.type == BT_CHARACTER
5083 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
5087 for (n = 0; n < sym->as->rank; n++)
5089 specification_expr = 1;
5090 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
5092 specification_expr = 1;
5093 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
5096 specification_expr = 0;
5099 /* Update the symbol's entry level. */
5100 sym->entry_id = current_entry_id + 1;
5103 /* If a symbol has been host_associated mark it. This is used latter,
5104 to identify if aliasing is possible via host association. */
5105 if (sym->attr.flavor == FL_VARIABLE
5106 && gfc_current_ns->parent
5107 && (gfc_current_ns->parent == sym->ns
5108 || (gfc_current_ns->parent->parent
5109 && gfc_current_ns->parent->parent == sym->ns)))
5110 sym->attr.host_assoc = 1;
5113 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
5116 /* F2008, C617 and C1229. */
5117 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
5118 && gfc_is_coindexed (e))
5120 gfc_ref *ref, *ref2 = NULL;
5122 for (ref = e->ref; ref; ref = ref->next)
5124 if (ref->type == REF_COMPONENT)
5126 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
5130 for ( ; ref; ref = ref->next)
5131 if (ref->type == REF_COMPONENT)
5134 /* Expression itself is not coindexed object. */
5135 if (ref && e->ts.type == BT_CLASS)
5137 gfc_error ("Polymorphic subobject of coindexed object at %L",
5142 /* Expression itself is coindexed object. */
5146 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
5147 for ( ; c; c = c->next)
5148 if (c->attr.allocatable && c->ts.type == BT_CLASS)
5150 gfc_error ("Coindexed object with polymorphic allocatable "
5151 "subcomponent at %L", &e->where);
5162 /* Checks to see that the correct symbol has been host associated.
5163 The only situation where this arises is that in which a twice
5164 contained function is parsed after the host association is made.
5165 Therefore, on detecting this, change the symbol in the expression
5166 and convert the array reference into an actual arglist if the old
5167 symbol is a variable. */
5169 check_host_association (gfc_expr *e)
5171 gfc_symbol *sym, *old_sym;
5175 gfc_actual_arglist *arg, *tail = NULL;
5176 bool retval = e->expr_type == EXPR_FUNCTION;
5178 /* If the expression is the result of substitution in
5179 interface.c(gfc_extend_expr) because there is no way in
5180 which the host association can be wrong. */
5181 if (e->symtree == NULL
5182 || e->symtree->n.sym == NULL
5183 || e->user_operator)
5186 old_sym = e->symtree->n.sym;
5188 if (gfc_current_ns->parent
5189 && old_sym->ns != gfc_current_ns)
5191 /* Use the 'USE' name so that renamed module symbols are
5192 correctly handled. */
5193 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
5195 if (sym && old_sym != sym
5196 && sym->ts.type == old_sym->ts.type
5197 && sym->attr.flavor == FL_PROCEDURE
5198 && sym->attr.contained)
5200 /* Clear the shape, since it might not be valid. */
5201 if (e->shape != NULL)
5202 gfc_free_shape (&e->shape, e->rank);
5204 /* Give the expression the right symtree! */
5205 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
5206 gcc_assert (st != NULL);
5208 if (old_sym->attr.flavor == FL_PROCEDURE
5209 || e->expr_type == EXPR_FUNCTION)
5211 /* Original was function so point to the new symbol, since
5212 the actual argument list is already attached to the
5214 e->value.function.esym = NULL;
5219 /* Original was variable so convert array references into
5220 an actual arglist. This does not need any checking now
5221 since resolve_function will take care of it. */
5222 e->value.function.actual = NULL;
5223 e->expr_type = EXPR_FUNCTION;
5226 /* Ambiguity will not arise if the array reference is not
5227 the last reference. */
5228 for (ref = e->ref; ref; ref = ref->next)
5229 if (ref->type == REF_ARRAY && ref->next == NULL)
5232 gcc_assert (ref->type == REF_ARRAY);
5234 /* Grab the start expressions from the array ref and
5235 copy them into actual arguments. */
5236 for (n = 0; n < ref->u.ar.dimen; n++)
5238 arg = gfc_get_actual_arglist ();
5239 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
5240 if (e->value.function.actual == NULL)
5241 tail = e->value.function.actual = arg;
5249 /* Dump the reference list and set the rank. */
5250 gfc_free_ref_list (e->ref);
5252 e->rank = sym->as ? sym->as->rank : 0;
5255 gfc_resolve_expr (e);
5259 /* This might have changed! */
5260 return e->expr_type == EXPR_FUNCTION;
5265 gfc_resolve_character_operator (gfc_expr *e)
5267 gfc_expr *op1 = e->value.op.op1;
5268 gfc_expr *op2 = e->value.op.op2;
5269 gfc_expr *e1 = NULL;
5270 gfc_expr *e2 = NULL;
5272 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
5274 if (op1->ts.u.cl && op1->ts.u.cl->length)
5275 e1 = gfc_copy_expr (op1->ts.u.cl->length);
5276 else if (op1->expr_type == EXPR_CONSTANT)
5277 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5278 op1->value.character.length);
5280 if (op2->ts.u.cl && op2->ts.u.cl->length)
5281 e2 = gfc_copy_expr (op2->ts.u.cl->length);
5282 else if (op2->expr_type == EXPR_CONSTANT)
5283 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5284 op2->value.character.length);
5286 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5291 e->ts.u.cl->length = gfc_add (e1, e2);
5292 e->ts.u.cl->length->ts.type = BT_INTEGER;
5293 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
5294 gfc_simplify_expr (e->ts.u.cl->length, 0);
5295 gfc_resolve_expr (e->ts.u.cl->length);
5301 /* Ensure that an character expression has a charlen and, if possible, a
5302 length expression. */
5305 fixup_charlen (gfc_expr *e)
5307 /* The cases fall through so that changes in expression type and the need
5308 for multiple fixes are picked up. In all circumstances, a charlen should
5309 be available for the middle end to hang a backend_decl on. */
5310 switch (e->expr_type)
5313 gfc_resolve_character_operator (e);
5316 if (e->expr_type == EXPR_ARRAY)
5317 gfc_resolve_character_array_constructor (e);
5319 case EXPR_SUBSTRING:
5320 if (!e->ts.u.cl && e->ref)
5321 gfc_resolve_substring_charlen (e);
5325 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5332 /* Update an actual argument to include the passed-object for type-bound
5333 procedures at the right position. */
5335 static gfc_actual_arglist*
5336 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5339 gcc_assert (argpos > 0);
5343 gfc_actual_arglist* result;
5345 result = gfc_get_actual_arglist ();
5349 result->name = name;
5355 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5357 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5362 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5365 extract_compcall_passed_object (gfc_expr* e)
5369 gcc_assert (e->expr_type == EXPR_COMPCALL);
5371 if (e->value.compcall.base_object)
5372 po = gfc_copy_expr (e->value.compcall.base_object);
5375 po = gfc_get_expr ();
5376 po->expr_type = EXPR_VARIABLE;
5377 po->symtree = e->symtree;
5378 po->ref = gfc_copy_ref (e->ref);
5379 po->where = e->where;
5382 if (gfc_resolve_expr (po) == FAILURE)
5389 /* Update the arglist of an EXPR_COMPCALL expression to include the
5393 update_compcall_arglist (gfc_expr* e)
5396 gfc_typebound_proc* tbp;
5398 tbp = e->value.compcall.tbp;
5403 po = extract_compcall_passed_object (e);
5407 if (tbp->nopass || e->value.compcall.ignore_pass)
5413 gcc_assert (tbp->pass_arg_num > 0);
5414 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5422 /* Extract the passed object from a PPC call (a copy of it). */
5425 extract_ppc_passed_object (gfc_expr *e)
5430 po = gfc_get_expr ();
5431 po->expr_type = EXPR_VARIABLE;
5432 po->symtree = e->symtree;
5433 po->ref = gfc_copy_ref (e->ref);
5434 po->where = e->where;
5436 /* Remove PPC reference. */
5438 while ((*ref)->next)
5439 ref = &(*ref)->next;
5440 gfc_free_ref_list (*ref);
5443 if (gfc_resolve_expr (po) == FAILURE)
5450 /* Update the actual arglist of a procedure pointer component to include the
5454 update_ppc_arglist (gfc_expr* e)
5458 gfc_typebound_proc* tb;
5460 if (!gfc_is_proc_ptr_comp (e, &ppc))
5467 else if (tb->nopass)
5470 po = extract_ppc_passed_object (e);
5477 gfc_error ("Passed-object at %L must be scalar", &e->where);
5482 if (po->ts.type == BT_DERIVED && po->ts.u.derived->attr.abstract)
5484 gfc_error ("Base object for procedure-pointer component call at %L is of"
5485 " ABSTRACT type '%s'", &e->where, po->ts.u.derived->name);
5489 gcc_assert (tb->pass_arg_num > 0);
5490 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5498 /* Check that the object a TBP is called on is valid, i.e. it must not be
5499 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5502 check_typebound_baseobject (gfc_expr* e)
5505 gfc_try return_value = FAILURE;
5507 base = extract_compcall_passed_object (e);
5511 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5514 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5516 gfc_error ("Base object for type-bound procedure call at %L is of"
5517 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5521 /* F08:C1230. If the procedure called is NOPASS,
5522 the base object must be scalar. */
5523 if (e->value.compcall.tbp->nopass && base->rank > 0)
5525 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5526 " be scalar", &e->where);
5530 /* FIXME: Remove once PR 43214 is fixed (TBP with non-scalar PASS). */
5533 gfc_error ("Non-scalar base object at %L currently not implemented",
5538 return_value = SUCCESS;
5541 gfc_free_expr (base);
5542 return return_value;
5546 /* Resolve a call to a type-bound procedure, either function or subroutine,
5547 statically from the data in an EXPR_COMPCALL expression. The adapted
5548 arglist and the target-procedure symtree are returned. */
5551 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5552 gfc_actual_arglist** actual)
5554 gcc_assert (e->expr_type == EXPR_COMPCALL);
5555 gcc_assert (!e->value.compcall.tbp->is_generic);
5557 /* Update the actual arglist for PASS. */
5558 if (update_compcall_arglist (e) == FAILURE)
5561 *actual = e->value.compcall.actual;
5562 *target = e->value.compcall.tbp->u.specific;
5564 gfc_free_ref_list (e->ref);
5566 e->value.compcall.actual = NULL;
5572 /* Get the ultimate declared type from an expression. In addition,
5573 return the last class/derived type reference and the copy of the
5576 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5579 gfc_symbol *declared;
5586 *new_ref = gfc_copy_ref (e->ref);
5588 for (ref = e->ref; ref; ref = ref->next)
5590 if (ref->type != REF_COMPONENT)
5593 if (ref->u.c.component->ts.type == BT_CLASS
5594 || ref->u.c.component->ts.type == BT_DERIVED)
5596 declared = ref->u.c.component->ts.u.derived;
5602 if (declared == NULL)
5603 declared = e->symtree->n.sym->ts.u.derived;
5609 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5610 which of the specific bindings (if any) matches the arglist and transform
5611 the expression into a call of that binding. */
5614 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5616 gfc_typebound_proc* genproc;
5617 const char* genname;
5619 gfc_symbol *derived;
5621 gcc_assert (e->expr_type == EXPR_COMPCALL);
5622 genname = e->value.compcall.name;
5623 genproc = e->value.compcall.tbp;
5625 if (!genproc->is_generic)
5628 /* Try the bindings on this type and in the inheritance hierarchy. */
5629 for (; genproc; genproc = genproc->overridden)
5633 gcc_assert (genproc->is_generic);
5634 for (g = genproc->u.generic; g; g = g->next)
5637 gfc_actual_arglist* args;
5640 gcc_assert (g->specific);
5642 if (g->specific->error)
5645 target = g->specific->u.specific->n.sym;
5647 /* Get the right arglist by handling PASS/NOPASS. */
5648 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5649 if (!g->specific->nopass)
5652 po = extract_compcall_passed_object (e);
5656 gcc_assert (g->specific->pass_arg_num > 0);
5657 gcc_assert (!g->specific->error);
5658 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5659 g->specific->pass_arg);
5661 resolve_actual_arglist (args, target->attr.proc,
5662 is_external_proc (target) && !target->formal);
5664 /* Check if this arglist matches the formal. */
5665 matches = gfc_arglist_matches_symbol (&args, target);
5667 /* Clean up and break out of the loop if we've found it. */
5668 gfc_free_actual_arglist (args);
5671 e->value.compcall.tbp = g->specific;
5672 genname = g->specific_st->name;
5673 /* Pass along the name for CLASS methods, where the vtab
5674 procedure pointer component has to be referenced. */
5682 /* Nothing matching found! */
5683 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5684 " '%s' at %L", genname, &e->where);
5688 /* Make sure that we have the right specific instance for the name. */
5689 derived = get_declared_from_expr (NULL, NULL, e);
5691 st = gfc_find_typebound_proc (derived, NULL, genname, true, &e->where);
5693 e->value.compcall.tbp = st->n.tb;
5699 /* Resolve a call to a type-bound subroutine. */
5702 resolve_typebound_call (gfc_code* c, const char **name)
5704 gfc_actual_arglist* newactual;
5705 gfc_symtree* target;
5707 /* Check that's really a SUBROUTINE. */
5708 if (!c->expr1->value.compcall.tbp->subroutine)
5710 gfc_error ("'%s' at %L should be a SUBROUTINE",
5711 c->expr1->value.compcall.name, &c->loc);
5715 if (check_typebound_baseobject (c->expr1) == FAILURE)
5718 /* Pass along the name for CLASS methods, where the vtab
5719 procedure pointer component has to be referenced. */
5721 *name = c->expr1->value.compcall.name;
5723 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5726 /* Transform into an ordinary EXEC_CALL for now. */
5728 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5731 c->ext.actual = newactual;
5732 c->symtree = target;
5733 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5735 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5737 gfc_free_expr (c->expr1);
5738 c->expr1 = gfc_get_expr ();
5739 c->expr1->expr_type = EXPR_FUNCTION;
5740 c->expr1->symtree = target;
5741 c->expr1->where = c->loc;
5743 return resolve_call (c);
5747 /* Resolve a component-call expression. */
5749 resolve_compcall (gfc_expr* e, const char **name)
5751 gfc_actual_arglist* newactual;
5752 gfc_symtree* target;
5754 /* Check that's really a FUNCTION. */
5755 if (!e->value.compcall.tbp->function)
5757 gfc_error ("'%s' at %L should be a FUNCTION",
5758 e->value.compcall.name, &e->where);
5762 /* These must not be assign-calls! */
5763 gcc_assert (!e->value.compcall.assign);
5765 if (check_typebound_baseobject (e) == FAILURE)
5768 /* Pass along the name for CLASS methods, where the vtab
5769 procedure pointer component has to be referenced. */
5771 *name = e->value.compcall.name;
5773 if (resolve_typebound_generic_call (e, name) == FAILURE)
5775 gcc_assert (!e->value.compcall.tbp->is_generic);
5777 /* Take the rank from the function's symbol. */
5778 if (e->value.compcall.tbp->u.specific->n.sym->as)
5779 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5781 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5782 arglist to the TBP's binding target. */
5784 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5787 e->value.function.actual = newactual;
5788 e->value.function.name = NULL;
5789 e->value.function.esym = target->n.sym;
5790 e->value.function.isym = NULL;
5791 e->symtree = target;
5792 e->ts = target->n.sym->ts;
5793 e->expr_type = EXPR_FUNCTION;
5795 /* Resolution is not necessary if this is a class subroutine; this
5796 function only has to identify the specific proc. Resolution of
5797 the call will be done next in resolve_typebound_call. */
5798 return gfc_resolve_expr (e);
5803 /* Resolve a typebound function, or 'method'. First separate all
5804 the non-CLASS references by calling resolve_compcall directly. */
5807 resolve_typebound_function (gfc_expr* e)
5809 gfc_symbol *declared;
5820 /* Deal with typebound operators for CLASS objects. */
5821 expr = e->value.compcall.base_object;
5822 if (expr && expr->ts.type == BT_CLASS && e->value.compcall.name)
5824 /* Since the typebound operators are generic, we have to ensure
5825 that any delays in resolution are corrected and that the vtab
5828 declared = ts.u.derived;
5829 c = gfc_find_component (declared, "_vptr", true, true);
5830 if (c->ts.u.derived == NULL)
5831 c->ts.u.derived = gfc_find_derived_vtab (declared);
5833 if (resolve_compcall (e, &name) == FAILURE)
5836 /* Use the generic name if it is there. */
5837 name = name ? name : e->value.function.esym->name;
5838 e->symtree = expr->symtree;
5839 e->ref = gfc_copy_ref (expr->ref);
5840 gfc_add_vptr_component (e);
5841 gfc_add_component_ref (e, name);
5842 e->value.function.esym = NULL;
5847 return resolve_compcall (e, NULL);
5849 if (resolve_ref (e) == FAILURE)
5852 /* Get the CLASS declared type. */
5853 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5855 /* Weed out cases of the ultimate component being a derived type. */
5856 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5857 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5859 gfc_free_ref_list (new_ref);
5860 return resolve_compcall (e, NULL);
5863 c = gfc_find_component (declared, "_data", true, true);
5864 declared = c->ts.u.derived;
5866 /* Treat the call as if it is a typebound procedure, in order to roll
5867 out the correct name for the specific function. */
5868 if (resolve_compcall (e, &name) == FAILURE)
5872 /* Then convert the expression to a procedure pointer component call. */
5873 e->value.function.esym = NULL;
5879 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5880 gfc_add_vptr_component (e);
5881 gfc_add_component_ref (e, name);
5883 /* Recover the typespec for the expression. This is really only
5884 necessary for generic procedures, where the additional call
5885 to gfc_add_component_ref seems to throw the collection of the
5886 correct typespec. */
5891 /* Resolve a typebound subroutine, or 'method'. First separate all
5892 the non-CLASS references by calling resolve_typebound_call
5896 resolve_typebound_subroutine (gfc_code *code)
5898 gfc_symbol *declared;
5907 st = code->expr1->symtree;
5909 /* Deal with typebound operators for CLASS objects. */
5910 expr = code->expr1->value.compcall.base_object;
5911 if (expr && expr->ts.type == BT_CLASS && code->expr1->value.compcall.name)
5913 /* Since the typebound operators are generic, we have to ensure
5914 that any delays in resolution are corrected and that the vtab
5916 declared = expr->ts.u.derived;
5917 c = gfc_find_component (declared, "_vptr", true, true);
5918 if (c->ts.u.derived == NULL)
5919 c->ts.u.derived = gfc_find_derived_vtab (declared);
5921 if (resolve_typebound_call (code, &name) == FAILURE)
5924 /* Use the generic name if it is there. */
5925 name = name ? name : code->expr1->value.function.esym->name;
5926 code->expr1->symtree = expr->symtree;
5927 code->expr1->ref = gfc_copy_ref (expr->ref);
5928 gfc_add_vptr_component (code->expr1);
5929 gfc_add_component_ref (code->expr1, name);
5930 code->expr1->value.function.esym = NULL;
5935 return resolve_typebound_call (code, NULL);
5937 if (resolve_ref (code->expr1) == FAILURE)
5940 /* Get the CLASS declared type. */
5941 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5943 /* Weed out cases of the ultimate component being a derived type. */
5944 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5945 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5947 gfc_free_ref_list (new_ref);
5948 return resolve_typebound_call (code, NULL);
5951 if (resolve_typebound_call (code, &name) == FAILURE)
5953 ts = code->expr1->ts;
5955 /* Then convert the expression to a procedure pointer component call. */
5956 code->expr1->value.function.esym = NULL;
5957 code->expr1->symtree = st;
5960 code->expr1->ref = new_ref;
5962 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5963 gfc_add_vptr_component (code->expr1);
5964 gfc_add_component_ref (code->expr1, name);
5966 /* Recover the typespec for the expression. This is really only
5967 necessary for generic procedures, where the additional call
5968 to gfc_add_component_ref seems to throw the collection of the
5969 correct typespec. */
5970 code->expr1->ts = ts;
5975 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5978 resolve_ppc_call (gfc_code* c)
5980 gfc_component *comp;
5983 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5986 c->resolved_sym = c->expr1->symtree->n.sym;
5987 c->expr1->expr_type = EXPR_VARIABLE;
5989 if (!comp->attr.subroutine)
5990 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5992 if (resolve_ref (c->expr1) == FAILURE)
5995 if (update_ppc_arglist (c->expr1) == FAILURE)
5998 c->ext.actual = c->expr1->value.compcall.actual;
6000 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
6001 comp->formal == NULL) == FAILURE)
6004 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
6010 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
6013 resolve_expr_ppc (gfc_expr* e)
6015 gfc_component *comp;
6018 b = gfc_is_proc_ptr_comp (e, &comp);
6021 /* Convert to EXPR_FUNCTION. */
6022 e->expr_type = EXPR_FUNCTION;
6023 e->value.function.isym = NULL;
6024 e->value.function.actual = e->value.compcall.actual;
6026 if (comp->as != NULL)
6027 e->rank = comp->as->rank;
6029 if (!comp->attr.function)
6030 gfc_add_function (&comp->attr, comp->name, &e->where);
6032 if (resolve_ref (e) == FAILURE)
6035 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
6036 comp->formal == NULL) == FAILURE)
6039 if (update_ppc_arglist (e) == FAILURE)
6042 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
6049 gfc_is_expandable_expr (gfc_expr *e)
6051 gfc_constructor *con;
6053 if (e->expr_type == EXPR_ARRAY)
6055 /* Traverse the constructor looking for variables that are flavor
6056 parameter. Parameters must be expanded since they are fully used at
6058 con = gfc_constructor_first (e->value.constructor);
6059 for (; con; con = gfc_constructor_next (con))
6061 if (con->expr->expr_type == EXPR_VARIABLE
6062 && con->expr->symtree
6063 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
6064 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
6066 if (con->expr->expr_type == EXPR_ARRAY
6067 && gfc_is_expandable_expr (con->expr))
6075 /* Resolve an expression. That is, make sure that types of operands agree
6076 with their operators, intrinsic operators are converted to function calls
6077 for overloaded types and unresolved function references are resolved. */
6080 gfc_resolve_expr (gfc_expr *e)
6088 /* inquiry_argument only applies to variables. */
6089 inquiry_save = inquiry_argument;
6090 if (e->expr_type != EXPR_VARIABLE)
6091 inquiry_argument = false;
6093 switch (e->expr_type)
6096 t = resolve_operator (e);
6102 if (check_host_association (e))
6103 t = resolve_function (e);
6106 t = resolve_variable (e);
6108 expression_rank (e);
6111 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
6112 && e->ref->type != REF_SUBSTRING)
6113 gfc_resolve_substring_charlen (e);
6118 t = resolve_typebound_function (e);
6121 case EXPR_SUBSTRING:
6122 t = resolve_ref (e);
6131 t = resolve_expr_ppc (e);
6136 if (resolve_ref (e) == FAILURE)
6139 t = gfc_resolve_array_constructor (e);
6140 /* Also try to expand a constructor. */
6143 expression_rank (e);
6144 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
6145 gfc_expand_constructor (e, false);
6148 /* This provides the opportunity for the length of constructors with
6149 character valued function elements to propagate the string length
6150 to the expression. */
6151 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
6153 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
6154 here rather then add a duplicate test for it above. */
6155 gfc_expand_constructor (e, false);
6156 t = gfc_resolve_character_array_constructor (e);
6161 case EXPR_STRUCTURE:
6162 t = resolve_ref (e);
6166 t = resolve_structure_cons (e, 0);
6170 t = gfc_simplify_expr (e, 0);
6174 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
6177 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
6180 inquiry_argument = inquiry_save;
6186 /* Resolve an expression from an iterator. They must be scalar and have
6187 INTEGER or (optionally) REAL type. */
6190 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
6191 const char *name_msgid)
6193 if (gfc_resolve_expr (expr) == FAILURE)
6196 if (expr->rank != 0)
6198 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
6202 if (expr->ts.type != BT_INTEGER)
6204 if (expr->ts.type == BT_REAL)
6207 return gfc_notify_std (GFC_STD_F95_DEL,
6208 "Deleted feature: %s at %L must be integer",
6209 _(name_msgid), &expr->where);
6212 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
6219 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
6227 /* Resolve the expressions in an iterator structure. If REAL_OK is
6228 false allow only INTEGER type iterators, otherwise allow REAL types. */
6231 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
6233 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
6237 if (gfc_check_vardef_context (iter->var, false, false, _("iterator variable"))
6241 if (gfc_resolve_iterator_expr (iter->start, real_ok,
6242 "Start expression in DO loop") == FAILURE)
6245 if (gfc_resolve_iterator_expr (iter->end, real_ok,
6246 "End expression in DO loop") == FAILURE)
6249 if (gfc_resolve_iterator_expr (iter->step, real_ok,
6250 "Step expression in DO loop") == FAILURE)
6253 if (iter->step->expr_type == EXPR_CONSTANT)
6255 if ((iter->step->ts.type == BT_INTEGER
6256 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
6257 || (iter->step->ts.type == BT_REAL
6258 && mpfr_sgn (iter->step->value.real) == 0))
6260 gfc_error ("Step expression in DO loop at %L cannot be zero",
6261 &iter->step->where);
6266 /* Convert start, end, and step to the same type as var. */
6267 if (iter->start->ts.kind != iter->var->ts.kind
6268 || iter->start->ts.type != iter->var->ts.type)
6269 gfc_convert_type (iter->start, &iter->var->ts, 2);
6271 if (iter->end->ts.kind != iter->var->ts.kind
6272 || iter->end->ts.type != iter->var->ts.type)
6273 gfc_convert_type (iter->end, &iter->var->ts, 2);
6275 if (iter->step->ts.kind != iter->var->ts.kind
6276 || iter->step->ts.type != iter->var->ts.type)
6277 gfc_convert_type (iter->step, &iter->var->ts, 2);
6279 if (iter->start->expr_type == EXPR_CONSTANT
6280 && iter->end->expr_type == EXPR_CONSTANT
6281 && iter->step->expr_type == EXPR_CONSTANT)
6284 if (iter->start->ts.type == BT_INTEGER)
6286 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
6287 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
6291 sgn = mpfr_sgn (iter->step->value.real);
6292 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
6294 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
6295 gfc_warning ("DO loop at %L will be executed zero times",
6296 &iter->step->where);
6303 /* Traversal function for find_forall_index. f == 2 signals that
6304 that variable itself is not to be checked - only the references. */
6307 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6309 if (expr->expr_type != EXPR_VARIABLE)
6312 /* A scalar assignment */
6313 if (!expr->ref || *f == 1)
6315 if (expr->symtree->n.sym == sym)
6327 /* Check whether the FORALL index appears in the expression or not.
6328 Returns SUCCESS if SYM is found in EXPR. */
6331 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6333 if (gfc_traverse_expr (expr, sym, forall_index, f))
6340 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6341 to be a scalar INTEGER variable. The subscripts and stride are scalar
6342 INTEGERs, and if stride is a constant it must be nonzero.
6343 Furthermore "A subscript or stride in a forall-triplet-spec shall
6344 not contain a reference to any index-name in the
6345 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6348 resolve_forall_iterators (gfc_forall_iterator *it)
6350 gfc_forall_iterator *iter, *iter2;
6352 for (iter = it; iter; iter = iter->next)
6354 if (gfc_resolve_expr (iter->var) == SUCCESS
6355 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6356 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6359 if (gfc_resolve_expr (iter->start) == SUCCESS
6360 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6361 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6362 &iter->start->where);
6363 if (iter->var->ts.kind != iter->start->ts.kind)
6364 gfc_convert_type (iter->start, &iter->var->ts, 2);
6366 if (gfc_resolve_expr (iter->end) == SUCCESS
6367 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6368 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6370 if (iter->var->ts.kind != iter->end->ts.kind)
6371 gfc_convert_type (iter->end, &iter->var->ts, 2);
6373 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6375 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6376 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6377 &iter->stride->where, "INTEGER");
6379 if (iter->stride->expr_type == EXPR_CONSTANT
6380 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6381 gfc_error ("FORALL stride expression at %L cannot be zero",
6382 &iter->stride->where);
6384 if (iter->var->ts.kind != iter->stride->ts.kind)
6385 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6388 for (iter = it; iter; iter = iter->next)
6389 for (iter2 = iter; iter2; iter2 = iter2->next)
6391 if (find_forall_index (iter2->start,
6392 iter->var->symtree->n.sym, 0) == SUCCESS
6393 || find_forall_index (iter2->end,
6394 iter->var->symtree->n.sym, 0) == SUCCESS
6395 || find_forall_index (iter2->stride,
6396 iter->var->symtree->n.sym, 0) == SUCCESS)
6397 gfc_error ("FORALL index '%s' may not appear in triplet "
6398 "specification at %L", iter->var->symtree->name,
6399 &iter2->start->where);
6404 /* Given a pointer to a symbol that is a derived type, see if it's
6405 inaccessible, i.e. if it's defined in another module and the components are
6406 PRIVATE. The search is recursive if necessary. Returns zero if no
6407 inaccessible components are found, nonzero otherwise. */
6410 derived_inaccessible (gfc_symbol *sym)
6414 if (sym->attr.use_assoc && sym->attr.private_comp)
6417 for (c = sym->components; c; c = c->next)
6419 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6427 /* Resolve the argument of a deallocate expression. The expression must be
6428 a pointer or a full array. */
6431 resolve_deallocate_expr (gfc_expr *e)
6433 symbol_attribute attr;
6434 int allocatable, pointer;
6439 if (gfc_resolve_expr (e) == FAILURE)
6442 if (e->expr_type != EXPR_VARIABLE)
6445 sym = e->symtree->n.sym;
6447 if (sym->ts.type == BT_CLASS)
6449 allocatable = CLASS_DATA (sym)->attr.allocatable;
6450 pointer = CLASS_DATA (sym)->attr.class_pointer;
6454 allocatable = sym->attr.allocatable;
6455 pointer = sym->attr.pointer;
6457 for (ref = e->ref; ref; ref = ref->next)
6462 if (ref->u.ar.type != AR_FULL
6463 && !(ref->u.ar.type == AR_ELEMENT && ref->u.ar.as->rank == 0
6464 && ref->u.ar.codimen && gfc_ref_this_image (ref)))
6469 c = ref->u.c.component;
6470 if (c->ts.type == BT_CLASS)
6472 allocatable = CLASS_DATA (c)->attr.allocatable;
6473 pointer = CLASS_DATA (c)->attr.class_pointer;
6477 allocatable = c->attr.allocatable;
6478 pointer = c->attr.pointer;
6488 attr = gfc_expr_attr (e);
6490 if (allocatable == 0 && attr.pointer == 0)
6493 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6499 if (gfc_is_coindexed (e))
6501 gfc_error ("Coindexed allocatable object at %L", &e->where);
6506 && gfc_check_vardef_context (e, true, true, _("DEALLOCATE object"))
6509 if (gfc_check_vardef_context (e, false, true, _("DEALLOCATE object"))
6517 /* Returns true if the expression e contains a reference to the symbol sym. */
6519 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6521 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6528 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6530 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6534 /* Given the expression node e for an allocatable/pointer of derived type to be
6535 allocated, get the expression node to be initialized afterwards (needed for
6536 derived types with default initializers, and derived types with allocatable
6537 components that need nullification.) */
6540 gfc_expr_to_initialize (gfc_expr *e)
6546 result = gfc_copy_expr (e);
6548 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6549 for (ref = result->ref; ref; ref = ref->next)
6550 if (ref->type == REF_ARRAY && ref->next == NULL)
6552 ref->u.ar.type = AR_FULL;
6554 for (i = 0; i < ref->u.ar.dimen; i++)
6555 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6560 gfc_free_shape (&result->shape, result->rank);
6562 /* Recalculate rank, shape, etc. */
6563 gfc_resolve_expr (result);
6568 /* If the last ref of an expression is an array ref, return a copy of the
6569 expression with that one removed. Otherwise, a copy of the original
6570 expression. This is used for allocate-expressions and pointer assignment
6571 LHS, where there may be an array specification that needs to be stripped
6572 off when using gfc_check_vardef_context. */
6575 remove_last_array_ref (gfc_expr* e)
6580 e2 = gfc_copy_expr (e);
6581 for (r = &e2->ref; *r; r = &(*r)->next)
6582 if ((*r)->type == REF_ARRAY && !(*r)->next)
6584 gfc_free_ref_list (*r);
6593 /* Used in resolve_allocate_expr to check that a allocation-object and
6594 a source-expr are conformable. This does not catch all possible
6595 cases; in particular a runtime checking is needed. */
6598 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6601 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6603 /* First compare rank. */
6604 if (tail && e1->rank != tail->u.ar.as->rank)
6606 gfc_error ("Source-expr at %L must be scalar or have the "
6607 "same rank as the allocate-object at %L",
6608 &e1->where, &e2->where);
6619 for (i = 0; i < e1->rank; i++)
6621 if (tail->u.ar.end[i])
6623 mpz_set (s, tail->u.ar.end[i]->value.integer);
6624 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6625 mpz_add_ui (s, s, 1);
6629 mpz_set (s, tail->u.ar.start[i]->value.integer);
6632 if (mpz_cmp (e1->shape[i], s) != 0)
6634 gfc_error ("Source-expr at %L and allocate-object at %L must "
6635 "have the same shape", &e1->where, &e2->where);
6648 /* Resolve the expression in an ALLOCATE statement, doing the additional
6649 checks to see whether the expression is OK or not. The expression must
6650 have a trailing array reference that gives the size of the array. */
6653 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6655 int i, pointer, allocatable, dimension, is_abstract;
6658 symbol_attribute attr;
6659 gfc_ref *ref, *ref2;
6662 gfc_symbol *sym = NULL;
6667 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6668 checking of coarrays. */
6669 for (ref = e->ref; ref; ref = ref->next)
6670 if (ref->next == NULL)
6673 if (ref && ref->type == REF_ARRAY)
6674 ref->u.ar.in_allocate = true;
6676 if (gfc_resolve_expr (e) == FAILURE)
6679 /* Make sure the expression is allocatable or a pointer. If it is
6680 pointer, the next-to-last reference must be a pointer. */
6684 sym = e->symtree->n.sym;
6686 /* Check whether ultimate component is abstract and CLASS. */
6689 if (e->expr_type != EXPR_VARIABLE)
6692 attr = gfc_expr_attr (e);
6693 pointer = attr.pointer;
6694 dimension = attr.dimension;
6695 codimension = attr.codimension;
6699 if (sym->ts.type == BT_CLASS)
6701 allocatable = CLASS_DATA (sym)->attr.allocatable;
6702 pointer = CLASS_DATA (sym)->attr.class_pointer;
6703 dimension = CLASS_DATA (sym)->attr.dimension;
6704 codimension = CLASS_DATA (sym)->attr.codimension;
6705 is_abstract = CLASS_DATA (sym)->attr.abstract;
6709 allocatable = sym->attr.allocatable;
6710 pointer = sym->attr.pointer;
6711 dimension = sym->attr.dimension;
6712 codimension = sym->attr.codimension;
6717 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6722 if (ref->u.ar.codimen > 0)
6725 for (n = ref->u.ar.dimen;
6726 n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
6727 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
6734 if (ref->next != NULL)
6742 gfc_error ("Coindexed allocatable object at %L",
6747 c = ref->u.c.component;
6748 if (c->ts.type == BT_CLASS)
6750 allocatable = CLASS_DATA (c)->attr.allocatable;
6751 pointer = CLASS_DATA (c)->attr.class_pointer;
6752 dimension = CLASS_DATA (c)->attr.dimension;
6753 codimension = CLASS_DATA (c)->attr.codimension;
6754 is_abstract = CLASS_DATA (c)->attr.abstract;
6758 allocatable = c->attr.allocatable;
6759 pointer = c->attr.pointer;
6760 dimension = c->attr.dimension;
6761 codimension = c->attr.codimension;
6762 is_abstract = c->attr.abstract;
6774 if (allocatable == 0 && pointer == 0)
6776 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6781 /* Some checks for the SOURCE tag. */
6784 /* Check F03:C631. */
6785 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6787 gfc_error ("Type of entity at %L is type incompatible with "
6788 "source-expr at %L", &e->where, &code->expr3->where);
6792 /* Check F03:C632 and restriction following Note 6.18. */
6793 if (code->expr3->rank > 0
6794 && conformable_arrays (code->expr3, e) == FAILURE)
6797 /* Check F03:C633. */
6798 if (code->expr3->ts.kind != e->ts.kind)
6800 gfc_error ("The allocate-object at %L and the source-expr at %L "
6801 "shall have the same kind type parameter",
6802 &e->where, &code->expr3->where);
6806 /* Check F2008, C642. */
6807 if (code->expr3->ts.type == BT_DERIVED
6808 && ((codimension && gfc_expr_attr (code->expr3).lock_comp)
6809 || (code->expr3->ts.u.derived->from_intmod
6810 == INTMOD_ISO_FORTRAN_ENV
6811 && code->expr3->ts.u.derived->intmod_sym_id
6812 == ISOFORTRAN_LOCK_TYPE)))
6814 gfc_error ("The source-expr at %L shall neither be of type "
6815 "LOCK_TYPE nor have a LOCK_TYPE component if "
6816 "allocate-object at %L is a coarray",
6817 &code->expr3->where, &e->where);
6822 /* Check F08:C629. */
6823 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6826 gcc_assert (e->ts.type == BT_CLASS);
6827 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6828 "type-spec or source-expr", sym->name, &e->where);
6832 /* In the variable definition context checks, gfc_expr_attr is used
6833 on the expression. This is fooled by the array specification
6834 present in e, thus we have to eliminate that one temporarily. */
6835 e2 = remove_last_array_ref (e);
6837 if (t == SUCCESS && pointer)
6838 t = gfc_check_vardef_context (e2, true, true, _("ALLOCATE object"));
6840 t = gfc_check_vardef_context (e2, false, true, _("ALLOCATE object"));
6847 /* Set up default initializer if needed. */
6851 if (code->ext.alloc.ts.type == BT_DERIVED)
6852 ts = code->ext.alloc.ts;
6856 if (ts.type == BT_CLASS)
6857 ts = ts.u.derived->components->ts;
6859 if (ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&ts)))
6861 gfc_code *init_st = gfc_get_code ();
6862 init_st->loc = code->loc;
6863 init_st->op = EXEC_INIT_ASSIGN;
6864 init_st->expr1 = gfc_expr_to_initialize (e);
6865 init_st->expr2 = init_e;
6866 init_st->next = code->next;
6867 code->next = init_st;
6870 else if (code->expr3->mold && code->expr3->ts.type == BT_DERIVED)
6872 /* Default initialization via MOLD (non-polymorphic). */
6873 gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
6874 gfc_resolve_expr (rhs);
6875 gfc_free_expr (code->expr3);
6879 if (e->ts.type == BT_CLASS)
6881 /* Make sure the vtab symbol is present when
6882 the module variables are generated. */
6883 gfc_typespec ts = e->ts;
6885 ts = code->expr3->ts;
6886 else if (code->ext.alloc.ts.type == BT_DERIVED)
6887 ts = code->ext.alloc.ts;
6888 gfc_find_derived_vtab (ts.u.derived);
6891 if (dimension == 0 && codimension == 0)
6894 /* Make sure the last reference node is an array specifiction. */
6896 if (!ref2 || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6897 || (dimension && ref2->u.ar.dimen == 0))
6899 gfc_error ("Array specification required in ALLOCATE statement "
6900 "at %L", &e->where);
6904 /* Make sure that the array section reference makes sense in the
6905 context of an ALLOCATE specification. */
6910 for (i = ar->dimen; i < ar->dimen + ar->codimen; i++)
6911 if (ar->dimen_type[i] == DIMEN_THIS_IMAGE)
6913 gfc_error ("Coarray specification required in ALLOCATE statement "
6914 "at %L", &e->where);
6918 for (i = 0; i < ar->dimen; i++)
6920 if (ref2->u.ar.type == AR_ELEMENT)
6923 switch (ar->dimen_type[i])
6929 if (ar->start[i] != NULL
6930 && ar->end[i] != NULL
6931 && ar->stride[i] == NULL)
6934 /* Fall Through... */
6939 case DIMEN_THIS_IMAGE:
6940 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6946 for (a = code->ext.alloc.list; a; a = a->next)
6948 sym = a->expr->symtree->n.sym;
6950 /* TODO - check derived type components. */
6951 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6954 if ((ar->start[i] != NULL
6955 && gfc_find_sym_in_expr (sym, ar->start[i]))
6956 || (ar->end[i] != NULL
6957 && gfc_find_sym_in_expr (sym, ar->end[i])))
6959 gfc_error ("'%s' must not appear in the array specification at "
6960 "%L in the same ALLOCATE statement where it is "
6961 "itself allocated", sym->name, &ar->where);
6967 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6969 if (ar->dimen_type[i] == DIMEN_ELEMENT
6970 || ar->dimen_type[i] == DIMEN_RANGE)
6972 if (i == (ar->dimen + ar->codimen - 1))
6974 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6975 "statement at %L", &e->where);
6981 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6982 && ar->stride[i] == NULL)
6985 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6998 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
7000 gfc_expr *stat, *errmsg, *pe, *qe;
7001 gfc_alloc *a, *p, *q;
7004 errmsg = code->expr2;
7006 /* Check the stat variable. */
7009 gfc_check_vardef_context (stat, false, false, _("STAT variable"));
7011 if ((stat->ts.type != BT_INTEGER
7012 && !(stat->ref && (stat->ref->type == REF_ARRAY
7013 || stat->ref->type == REF_COMPONENT)))
7015 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
7016 "variable", &stat->where);
7018 for (p = code->ext.alloc.list; p; p = p->next)
7019 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
7021 gfc_ref *ref1, *ref2;
7024 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
7025 ref1 = ref1->next, ref2 = ref2->next)
7027 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7029 if (ref1->u.c.component->name != ref2->u.c.component->name)
7038 gfc_error ("Stat-variable at %L shall not be %sd within "
7039 "the same %s statement", &stat->where, fcn, fcn);
7045 /* Check the errmsg variable. */
7049 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
7052 gfc_check_vardef_context (errmsg, false, false, _("ERRMSG variable"));
7054 if ((errmsg->ts.type != BT_CHARACTER
7056 && (errmsg->ref->type == REF_ARRAY
7057 || errmsg->ref->type == REF_COMPONENT)))
7058 || errmsg->rank > 0 )
7059 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
7060 "variable", &errmsg->where);
7062 for (p = code->ext.alloc.list; p; p = p->next)
7063 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
7065 gfc_ref *ref1, *ref2;
7068 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
7069 ref1 = ref1->next, ref2 = ref2->next)
7071 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7073 if (ref1->u.c.component->name != ref2->u.c.component->name)
7082 gfc_error ("Errmsg-variable at %L shall not be %sd within "
7083 "the same %s statement", &errmsg->where, fcn, fcn);
7089 /* Check that an allocate-object appears only once in the statement.
7090 FIXME: Checking derived types is disabled. */
7091 for (p = code->ext.alloc.list; p; p = p->next)
7094 for (q = p->next; q; q = q->next)
7097 if (pe->symtree->n.sym->name == qe->symtree->n.sym->name)
7099 /* This is a potential collision. */
7100 gfc_ref *pr = pe->ref;
7101 gfc_ref *qr = qe->ref;
7103 /* Follow the references until
7104 a) They start to differ, in which case there is no error;
7105 you can deallocate a%b and a%c in a single statement
7106 b) Both of them stop, which is an error
7107 c) One of them stops, which is also an error. */
7110 if (pr == NULL && qr == NULL)
7112 gfc_error ("Allocate-object at %L also appears at %L",
7113 &pe->where, &qe->where);
7116 else if (pr != NULL && qr == NULL)
7118 gfc_error ("Allocate-object at %L is subobject of"
7119 " object at %L", &pe->where, &qe->where);
7122 else if (pr == NULL && qr != NULL)
7124 gfc_error ("Allocate-object at %L is subobject of"
7125 " object at %L", &qe->where, &pe->where);
7128 /* Here, pr != NULL && qr != NULL */
7129 gcc_assert(pr->type == qr->type);
7130 if (pr->type == REF_ARRAY)
7132 /* Handle cases like allocate(v(3)%x(3), v(2)%x(3)),
7134 gcc_assert (qr->type == REF_ARRAY);
7136 if (pr->next && qr->next)
7138 gfc_array_ref *par = &(pr->u.ar);
7139 gfc_array_ref *qar = &(qr->u.ar);
7140 if (gfc_dep_compare_expr (par->start[0],
7141 qar->start[0]) != 0)
7147 if (pr->u.c.component->name != qr->u.c.component->name)
7158 if (strcmp (fcn, "ALLOCATE") == 0)
7160 for (a = code->ext.alloc.list; a; a = a->next)
7161 resolve_allocate_expr (a->expr, code);
7165 for (a = code->ext.alloc.list; a; a = a->next)
7166 resolve_deallocate_expr (a->expr);
7171 /************ SELECT CASE resolution subroutines ************/
7173 /* Callback function for our mergesort variant. Determines interval
7174 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
7175 op1 > op2. Assumes we're not dealing with the default case.
7176 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
7177 There are nine situations to check. */
7180 compare_cases (const gfc_case *op1, const gfc_case *op2)
7184 if (op1->low == NULL) /* op1 = (:L) */
7186 /* op2 = (:N), so overlap. */
7188 /* op2 = (M:) or (M:N), L < M */
7189 if (op2->low != NULL
7190 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7193 else if (op1->high == NULL) /* op1 = (K:) */
7195 /* op2 = (M:), so overlap. */
7197 /* op2 = (:N) or (M:N), K > N */
7198 if (op2->high != NULL
7199 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7202 else /* op1 = (K:L) */
7204 if (op2->low == NULL) /* op2 = (:N), K > N */
7205 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7207 else if (op2->high == NULL) /* op2 = (M:), L < M */
7208 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7210 else /* op2 = (M:N) */
7214 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7217 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7226 /* Merge-sort a double linked case list, detecting overlap in the
7227 process. LIST is the head of the double linked case list before it
7228 is sorted. Returns the head of the sorted list if we don't see any
7229 overlap, or NULL otherwise. */
7232 check_case_overlap (gfc_case *list)
7234 gfc_case *p, *q, *e, *tail;
7235 int insize, nmerges, psize, qsize, cmp, overlap_seen;
7237 /* If the passed list was empty, return immediately. */
7244 /* Loop unconditionally. The only exit from this loop is a return
7245 statement, when we've finished sorting the case list. */
7252 /* Count the number of merges we do in this pass. */
7255 /* Loop while there exists a merge to be done. */
7260 /* Count this merge. */
7263 /* Cut the list in two pieces by stepping INSIZE places
7264 forward in the list, starting from P. */
7267 for (i = 0; i < insize; i++)
7276 /* Now we have two lists. Merge them! */
7277 while (psize > 0 || (qsize > 0 && q != NULL))
7279 /* See from which the next case to merge comes from. */
7282 /* P is empty so the next case must come from Q. */
7287 else if (qsize == 0 || q == NULL)
7296 cmp = compare_cases (p, q);
7299 /* The whole case range for P is less than the
7307 /* The whole case range for Q is greater than
7308 the case range for P. */
7315 /* The cases overlap, or they are the same
7316 element in the list. Either way, we must
7317 issue an error and get the next case from P. */
7318 /* FIXME: Sort P and Q by line number. */
7319 gfc_error ("CASE label at %L overlaps with CASE "
7320 "label at %L", &p->where, &q->where);
7328 /* Add the next element to the merged list. */
7337 /* P has now stepped INSIZE places along, and so has Q. So
7338 they're the same. */
7343 /* If we have done only one merge or none at all, we've
7344 finished sorting the cases. */
7353 /* Otherwise repeat, merging lists twice the size. */
7359 /* Check to see if an expression is suitable for use in a CASE statement.
7360 Makes sure that all case expressions are scalar constants of the same
7361 type. Return FAILURE if anything is wrong. */
7364 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
7366 if (e == NULL) return SUCCESS;
7368 if (e->ts.type != case_expr->ts.type)
7370 gfc_error ("Expression in CASE statement at %L must be of type %s",
7371 &e->where, gfc_basic_typename (case_expr->ts.type));
7375 /* C805 (R808) For a given case-construct, each case-value shall be of
7376 the same type as case-expr. For character type, length differences
7377 are allowed, but the kind type parameters shall be the same. */
7379 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
7381 gfc_error ("Expression in CASE statement at %L must be of kind %d",
7382 &e->where, case_expr->ts.kind);
7386 /* Convert the case value kind to that of case expression kind,
7389 if (e->ts.kind != case_expr->ts.kind)
7390 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
7394 gfc_error ("Expression in CASE statement at %L must be scalar",
7403 /* Given a completely parsed select statement, we:
7405 - Validate all expressions and code within the SELECT.
7406 - Make sure that the selection expression is not of the wrong type.
7407 - Make sure that no case ranges overlap.
7408 - Eliminate unreachable cases and unreachable code resulting from
7409 removing case labels.
7411 The standard does allow unreachable cases, e.g. CASE (5:3). But
7412 they are a hassle for code generation, and to prevent that, we just
7413 cut them out here. This is not necessary for overlapping cases
7414 because they are illegal and we never even try to generate code.
7416 We have the additional caveat that a SELECT construct could have
7417 been a computed GOTO in the source code. Fortunately we can fairly
7418 easily work around that here: The case_expr for a "real" SELECT CASE
7419 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7420 we have to do is make sure that the case_expr is a scalar integer
7424 resolve_select (gfc_code *code)
7427 gfc_expr *case_expr;
7428 gfc_case *cp, *default_case, *tail, *head;
7429 int seen_unreachable;
7435 if (code->expr1 == NULL)
7437 /* This was actually a computed GOTO statement. */
7438 case_expr = code->expr2;
7439 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7440 gfc_error ("Selection expression in computed GOTO statement "
7441 "at %L must be a scalar integer expression",
7444 /* Further checking is not necessary because this SELECT was built
7445 by the compiler, so it should always be OK. Just move the
7446 case_expr from expr2 to expr so that we can handle computed
7447 GOTOs as normal SELECTs from here on. */
7448 code->expr1 = code->expr2;
7453 case_expr = code->expr1;
7455 type = case_expr->ts.type;
7456 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7458 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7459 &case_expr->where, gfc_typename (&case_expr->ts));
7461 /* Punt. Going on here just produce more garbage error messages. */
7465 if (case_expr->rank != 0)
7467 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7468 "expression", &case_expr->where);
7475 /* Raise a warning if an INTEGER case value exceeds the range of
7476 the case-expr. Later, all expressions will be promoted to the
7477 largest kind of all case-labels. */
7479 if (type == BT_INTEGER)
7480 for (body = code->block; body; body = body->block)
7481 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7484 && gfc_check_integer_range (cp->low->value.integer,
7485 case_expr->ts.kind) != ARITH_OK)
7486 gfc_warning ("Expression in CASE statement at %L is "
7487 "not in the range of %s", &cp->low->where,
7488 gfc_typename (&case_expr->ts));
7491 && cp->low != cp->high
7492 && gfc_check_integer_range (cp->high->value.integer,
7493 case_expr->ts.kind) != ARITH_OK)
7494 gfc_warning ("Expression in CASE statement at %L is "
7495 "not in the range of %s", &cp->high->where,
7496 gfc_typename (&case_expr->ts));
7499 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7500 of the SELECT CASE expression and its CASE values. Walk the lists
7501 of case values, and if we find a mismatch, promote case_expr to
7502 the appropriate kind. */
7504 if (type == BT_LOGICAL || type == BT_INTEGER)
7506 for (body = code->block; body; body = body->block)
7508 /* Walk the case label list. */
7509 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7511 /* Intercept the DEFAULT case. It does not have a kind. */
7512 if (cp->low == NULL && cp->high == NULL)
7515 /* Unreachable case ranges are discarded, so ignore. */
7516 if (cp->low != NULL && cp->high != NULL
7517 && cp->low != cp->high
7518 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7522 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7523 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7525 if (cp->high != NULL
7526 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7527 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7532 /* Assume there is no DEFAULT case. */
7533 default_case = NULL;
7538 for (body = code->block; body; body = body->block)
7540 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7542 seen_unreachable = 0;
7544 /* Walk the case label list, making sure that all case labels
7546 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7548 /* Count the number of cases in the whole construct. */
7551 /* Intercept the DEFAULT case. */
7552 if (cp->low == NULL && cp->high == NULL)
7554 if (default_case != NULL)
7556 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7557 "by a second DEFAULT CASE at %L",
7558 &default_case->where, &cp->where);
7569 /* Deal with single value cases and case ranges. Errors are
7570 issued from the validation function. */
7571 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7572 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7578 if (type == BT_LOGICAL
7579 && ((cp->low == NULL || cp->high == NULL)
7580 || cp->low != cp->high))
7582 gfc_error ("Logical range in CASE statement at %L is not "
7583 "allowed", &cp->low->where);
7588 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7591 value = cp->low->value.logical == 0 ? 2 : 1;
7592 if (value & seen_logical)
7594 gfc_error ("Constant logical value in CASE statement "
7595 "is repeated at %L",
7600 seen_logical |= value;
7603 if (cp->low != NULL && cp->high != NULL
7604 && cp->low != cp->high
7605 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7607 if (gfc_option.warn_surprising)
7608 gfc_warning ("Range specification at %L can never "
7609 "be matched", &cp->where);
7611 cp->unreachable = 1;
7612 seen_unreachable = 1;
7616 /* If the case range can be matched, it can also overlap with
7617 other cases. To make sure it does not, we put it in a
7618 double linked list here. We sort that with a merge sort
7619 later on to detect any overlapping cases. */
7623 head->right = head->left = NULL;
7628 tail->right->left = tail;
7635 /* It there was a failure in the previous case label, give up
7636 for this case label list. Continue with the next block. */
7640 /* See if any case labels that are unreachable have been seen.
7641 If so, we eliminate them. This is a bit of a kludge because
7642 the case lists for a single case statement (label) is a
7643 single forward linked lists. */
7644 if (seen_unreachable)
7646 /* Advance until the first case in the list is reachable. */
7647 while (body->ext.block.case_list != NULL
7648 && body->ext.block.case_list->unreachable)
7650 gfc_case *n = body->ext.block.case_list;
7651 body->ext.block.case_list = body->ext.block.case_list->next;
7653 gfc_free_case_list (n);
7656 /* Strip all other unreachable cases. */
7657 if (body->ext.block.case_list)
7659 for (cp = body->ext.block.case_list; cp->next; cp = cp->next)
7661 if (cp->next->unreachable)
7663 gfc_case *n = cp->next;
7664 cp->next = cp->next->next;
7666 gfc_free_case_list (n);
7673 /* See if there were overlapping cases. If the check returns NULL,
7674 there was overlap. In that case we don't do anything. If head
7675 is non-NULL, we prepend the DEFAULT case. The sorted list can
7676 then used during code generation for SELECT CASE constructs with
7677 a case expression of a CHARACTER type. */
7680 head = check_case_overlap (head);
7682 /* Prepend the default_case if it is there. */
7683 if (head != NULL && default_case)
7685 default_case->left = NULL;
7686 default_case->right = head;
7687 head->left = default_case;
7691 /* Eliminate dead blocks that may be the result if we've seen
7692 unreachable case labels for a block. */
7693 for (body = code; body && body->block; body = body->block)
7695 if (body->block->ext.block.case_list == NULL)
7697 /* Cut the unreachable block from the code chain. */
7698 gfc_code *c = body->block;
7699 body->block = c->block;
7701 /* Kill the dead block, but not the blocks below it. */
7703 gfc_free_statements (c);
7707 /* More than two cases is legal but insane for logical selects.
7708 Issue a warning for it. */
7709 if (gfc_option.warn_surprising && type == BT_LOGICAL
7711 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7716 /* Check if a derived type is extensible. */
7719 gfc_type_is_extensible (gfc_symbol *sym)
7721 return !(sym->attr.is_bind_c || sym->attr.sequence);
7725 /* Resolve an associate name: Resolve target and ensure the type-spec is
7726 correct as well as possibly the array-spec. */
7729 resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
7733 gcc_assert (sym->assoc);
7734 gcc_assert (sym->attr.flavor == FL_VARIABLE);
7736 /* If this is for SELECT TYPE, the target may not yet be set. In that
7737 case, return. Resolution will be called later manually again when
7739 target = sym->assoc->target;
7742 gcc_assert (!sym->assoc->dangling);
7744 if (resolve_target && gfc_resolve_expr (target) != SUCCESS)
7747 /* For variable targets, we get some attributes from the target. */
7748 if (target->expr_type == EXPR_VARIABLE)
7752 gcc_assert (target->symtree);
7753 tsym = target->symtree->n.sym;
7755 sym->attr.asynchronous = tsym->attr.asynchronous;
7756 sym->attr.volatile_ = tsym->attr.volatile_;
7758 sym->attr.target = (tsym->attr.target || tsym->attr.pointer);
7761 /* Get type if this was not already set. Note that it can be
7762 some other type than the target in case this is a SELECT TYPE
7763 selector! So we must not update when the type is already there. */
7764 if (sym->ts.type == BT_UNKNOWN)
7765 sym->ts = target->ts;
7766 gcc_assert (sym->ts.type != BT_UNKNOWN);
7768 /* See if this is a valid association-to-variable. */
7769 sym->assoc->variable = (target->expr_type == EXPR_VARIABLE
7770 && !gfc_has_vector_subscript (target));
7772 /* Finally resolve if this is an array or not. */
7773 if (sym->attr.dimension && target->rank == 0)
7775 gfc_error ("Associate-name '%s' at %L is used as array",
7776 sym->name, &sym->declared_at);
7777 sym->attr.dimension = 0;
7780 if (target->rank > 0)
7781 sym->attr.dimension = 1;
7783 if (sym->attr.dimension)
7785 sym->as = gfc_get_array_spec ();
7786 sym->as->rank = target->rank;
7787 sym->as->type = AS_DEFERRED;
7789 /* Target must not be coindexed, thus the associate-variable
7791 sym->as->corank = 0;
7796 /* Resolve a SELECT TYPE statement. */
7799 resolve_select_type (gfc_code *code, gfc_namespace *old_ns)
7801 gfc_symbol *selector_type;
7802 gfc_code *body, *new_st, *if_st, *tail;
7803 gfc_code *class_is = NULL, *default_case = NULL;
7806 char name[GFC_MAX_SYMBOL_LEN];
7810 ns = code->ext.block.ns;
7813 /* Check for F03:C813. */
7814 if (code->expr1->ts.type != BT_CLASS
7815 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7817 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7818 "at %L", &code->loc);
7824 if (code->expr1->symtree->n.sym->attr.untyped)
7825 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7826 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7829 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7831 /* Loop over TYPE IS / CLASS IS cases. */
7832 for (body = code->block; body; body = body->block)
7834 c = body->ext.block.case_list;
7836 /* Check F03:C815. */
7837 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7838 && !gfc_type_is_extensible (c->ts.u.derived))
7840 gfc_error ("Derived type '%s' at %L must be extensible",
7841 c->ts.u.derived->name, &c->where);
7846 /* Check F03:C816. */
7847 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7848 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7850 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7851 c->ts.u.derived->name, &c->where, selector_type->name);
7856 /* Intercept the DEFAULT case. */
7857 if (c->ts.type == BT_UNKNOWN)
7859 /* Check F03:C818. */
7862 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7863 "by a second DEFAULT CASE at %L",
7864 &default_case->ext.block.case_list->where, &c->where);
7869 default_case = body;
7876 /* Transform SELECT TYPE statement to BLOCK and associate selector to
7877 target if present. If there are any EXIT statements referring to the
7878 SELECT TYPE construct, this is no problem because the gfc_code
7879 reference stays the same and EXIT is equally possible from the BLOCK
7880 it is changed to. */
7881 code->op = EXEC_BLOCK;
7884 gfc_association_list* assoc;
7886 assoc = gfc_get_association_list ();
7887 assoc->st = code->expr1->symtree;
7888 assoc->target = gfc_copy_expr (code->expr2);
7889 /* assoc->variable will be set by resolve_assoc_var. */
7891 code->ext.block.assoc = assoc;
7892 code->expr1->symtree->n.sym->assoc = assoc;
7894 resolve_assoc_var (code->expr1->symtree->n.sym, false);
7897 code->ext.block.assoc = NULL;
7899 /* Add EXEC_SELECT to switch on type. */
7900 new_st = gfc_get_code ();
7901 new_st->op = code->op;
7902 new_st->expr1 = code->expr1;
7903 new_st->expr2 = code->expr2;
7904 new_st->block = code->block;
7905 code->expr1 = code->expr2 = NULL;
7910 ns->code->next = new_st;
7912 code->op = EXEC_SELECT;
7913 gfc_add_vptr_component (code->expr1);
7914 gfc_add_hash_component (code->expr1);
7916 /* Loop over TYPE IS / CLASS IS cases. */
7917 for (body = code->block; body; body = body->block)
7919 c = body->ext.block.case_list;
7921 if (c->ts.type == BT_DERIVED)
7922 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7923 c->ts.u.derived->hash_value);
7925 else if (c->ts.type == BT_UNKNOWN)
7928 /* Associate temporary to selector. This should only be done
7929 when this case is actually true, so build a new ASSOCIATE
7930 that does precisely this here (instead of using the
7933 if (c->ts.type == BT_CLASS)
7934 sprintf (name, "__tmp_class_%s", c->ts.u.derived->name);
7936 sprintf (name, "__tmp_type_%s", c->ts.u.derived->name);
7937 st = gfc_find_symtree (ns->sym_root, name);
7938 gcc_assert (st->n.sym->assoc);
7939 st->n.sym->assoc->target = gfc_get_variable_expr (code->expr1->symtree);
7940 if (c->ts.type == BT_DERIVED)
7941 gfc_add_data_component (st->n.sym->assoc->target);
7943 new_st = gfc_get_code ();
7944 new_st->op = EXEC_BLOCK;
7945 new_st->ext.block.ns = gfc_build_block_ns (ns);
7946 new_st->ext.block.ns->code = body->next;
7947 body->next = new_st;
7949 /* Chain in the new list only if it is marked as dangling. Otherwise
7950 there is a CASE label overlap and this is already used. Just ignore,
7951 the error is diagonsed elsewhere. */
7952 if (st->n.sym->assoc->dangling)
7954 new_st->ext.block.assoc = st->n.sym->assoc;
7955 st->n.sym->assoc->dangling = 0;
7958 resolve_assoc_var (st->n.sym, false);
7961 /* Take out CLASS IS cases for separate treatment. */
7963 while (body && body->block)
7965 if (body->block->ext.block.case_list->ts.type == BT_CLASS)
7967 /* Add to class_is list. */
7968 if (class_is == NULL)
7970 class_is = body->block;
7975 for (tail = class_is; tail->block; tail = tail->block) ;
7976 tail->block = body->block;
7979 /* Remove from EXEC_SELECT list. */
7980 body->block = body->block->block;
7993 /* Add a default case to hold the CLASS IS cases. */
7994 for (tail = code; tail->block; tail = tail->block) ;
7995 tail->block = gfc_get_code ();
7997 tail->op = EXEC_SELECT_TYPE;
7998 tail->ext.block.case_list = gfc_get_case ();
7999 tail->ext.block.case_list->ts.type = BT_UNKNOWN;
8001 default_case = tail;
8004 /* More than one CLASS IS block? */
8005 if (class_is->block)
8009 /* Sort CLASS IS blocks by extension level. */
8013 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
8016 /* F03:C817 (check for doubles). */
8017 if ((*c1)->ext.block.case_list->ts.u.derived->hash_value
8018 == c2->ext.block.case_list->ts.u.derived->hash_value)
8020 gfc_error ("Double CLASS IS block in SELECT TYPE "
8022 &c2->ext.block.case_list->where);
8025 if ((*c1)->ext.block.case_list->ts.u.derived->attr.extension
8026 < c2->ext.block.case_list->ts.u.derived->attr.extension)
8029 (*c1)->block = c2->block;
8039 /* Generate IF chain. */
8040 if_st = gfc_get_code ();
8041 if_st->op = EXEC_IF;
8043 for (body = class_is; body; body = body->block)
8045 new_st->block = gfc_get_code ();
8046 new_st = new_st->block;
8047 new_st->op = EXEC_IF;
8048 /* Set up IF condition: Call _gfortran_is_extension_of. */
8049 new_st->expr1 = gfc_get_expr ();
8050 new_st->expr1->expr_type = EXPR_FUNCTION;
8051 new_st->expr1->ts.type = BT_LOGICAL;
8052 new_st->expr1->ts.kind = 4;
8053 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
8054 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
8055 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
8056 /* Set up arguments. */
8057 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
8058 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
8059 new_st->expr1->value.function.actual->expr->where = code->loc;
8060 gfc_add_vptr_component (new_st->expr1->value.function.actual->expr);
8061 vtab = gfc_find_derived_vtab (body->ext.block.case_list->ts.u.derived);
8062 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
8063 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
8064 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
8065 new_st->next = body->next;
8067 if (default_case->next)
8069 new_st->block = gfc_get_code ();
8070 new_st = new_st->block;
8071 new_st->op = EXEC_IF;
8072 new_st->next = default_case->next;
8075 /* Replace CLASS DEFAULT code by the IF chain. */
8076 default_case->next = if_st;
8079 /* Resolve the internal code. This can not be done earlier because
8080 it requires that the sym->assoc of selectors is set already. */
8081 gfc_current_ns = ns;
8082 gfc_resolve_blocks (code->block, gfc_current_ns);
8083 gfc_current_ns = old_ns;
8085 resolve_select (code);
8089 /* Resolve a transfer statement. This is making sure that:
8090 -- a derived type being transferred has only non-pointer components
8091 -- a derived type being transferred doesn't have private components, unless
8092 it's being transferred from the module where the type was defined
8093 -- we're not trying to transfer a whole assumed size array. */
8096 resolve_transfer (gfc_code *code)
8105 while (exp != NULL && exp->expr_type == EXPR_OP
8106 && exp->value.op.op == INTRINSIC_PARENTHESES)
8107 exp = exp->value.op.op1;
8109 if (exp == NULL || (exp->expr_type != EXPR_VARIABLE
8110 && exp->expr_type != EXPR_FUNCTION))
8113 /* If we are reading, the variable will be changed. Note that
8114 code->ext.dt may be NULL if the TRANSFER is related to
8115 an INQUIRE statement -- but in this case, we are not reading, either. */
8116 if (code->ext.dt && code->ext.dt->dt_io_kind->value.iokind == M_READ
8117 && gfc_check_vardef_context (exp, false, false, _("item in READ"))
8121 sym = exp->symtree->n.sym;
8124 /* Go to actual component transferred. */
8125 for (ref = exp->ref; ref; ref = ref->next)
8126 if (ref->type == REF_COMPONENT)
8127 ts = &ref->u.c.component->ts;
8129 if (ts->type == BT_CLASS)
8131 /* FIXME: Test for defined input/output. */
8132 gfc_error ("Data transfer element at %L cannot be polymorphic unless "
8133 "it is processed by a defined input/output procedure",
8138 if (ts->type == BT_DERIVED)
8140 /* Check that transferred derived type doesn't contain POINTER
8142 if (ts->u.derived->attr.pointer_comp)
8144 gfc_error ("Data transfer element at %L cannot have POINTER "
8145 "components unless it is processed by a defined "
8146 "input/output procedure", &code->loc);
8151 if (ts->u.derived->attr.proc_pointer_comp)
8153 gfc_error ("Data transfer element at %L cannot have "
8154 "procedure pointer components", &code->loc);
8158 if (ts->u.derived->attr.alloc_comp)
8160 gfc_error ("Data transfer element at %L cannot have ALLOCATABLE "
8161 "components unless it is processed by a defined "
8162 "input/output procedure", &code->loc);
8166 if (derived_inaccessible (ts->u.derived))
8168 gfc_error ("Data transfer element at %L cannot have "
8169 "PRIVATE components",&code->loc);
8174 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
8175 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
8177 gfc_error ("Data transfer element at %L cannot be a full reference to "
8178 "an assumed-size array", &code->loc);
8184 /*********** Toplevel code resolution subroutines ***********/
8186 /* Find the set of labels that are reachable from this block. We also
8187 record the last statement in each block. */
8190 find_reachable_labels (gfc_code *block)
8197 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
8199 /* Collect labels in this block. We don't keep those corresponding
8200 to END {IF|SELECT}, these are checked in resolve_branch by going
8201 up through the code_stack. */
8202 for (c = block; c; c = c->next)
8204 if (c->here && c->op != EXEC_END_NESTED_BLOCK)
8205 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
8208 /* Merge with labels from parent block. */
8211 gcc_assert (cs_base->prev->reachable_labels);
8212 bitmap_ior_into (cs_base->reachable_labels,
8213 cs_base->prev->reachable_labels);
8219 resolve_lock_unlock (gfc_code *code)
8221 if (code->expr1->ts.type != BT_DERIVED
8222 || code->expr1->expr_type != EXPR_VARIABLE
8223 || code->expr1->ts.u.derived->from_intmod != INTMOD_ISO_FORTRAN_ENV
8224 || code->expr1->ts.u.derived->intmod_sym_id != ISOFORTRAN_LOCK_TYPE
8225 || code->expr1->rank != 0
8226 || (!gfc_is_coarray (code->expr1) && !gfc_is_coindexed (code->expr1)))
8227 gfc_error ("Lock variable at %L must be a scalar of type LOCK_TYPE",
8228 &code->expr1->where);
8232 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8233 || code->expr2->expr_type != EXPR_VARIABLE))
8234 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8235 &code->expr2->where);
8238 && gfc_check_vardef_context (code->expr2, false, false,
8239 _("STAT variable")) == FAILURE)
8244 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8245 || code->expr3->expr_type != EXPR_VARIABLE))
8246 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8247 &code->expr3->where);
8250 && gfc_check_vardef_context (code->expr3, false, false,
8251 _("ERRMSG variable")) == FAILURE)
8254 /* Check ACQUIRED_LOCK. */
8256 && (code->expr4->ts.type != BT_LOGICAL || code->expr4->rank != 0
8257 || code->expr4->expr_type != EXPR_VARIABLE))
8258 gfc_error ("ACQUIRED_LOCK= argument at %L must be a scalar LOGICAL "
8259 "variable", &code->expr4->where);
8262 && gfc_check_vardef_context (code->expr4, false, false,
8263 _("ACQUIRED_LOCK variable")) == FAILURE)
8269 resolve_sync (gfc_code *code)
8271 /* Check imageset. The * case matches expr1 == NULL. */
8274 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
8275 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
8276 "INTEGER expression", &code->expr1->where);
8277 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
8278 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
8279 gfc_error ("Imageset argument at %L must between 1 and num_images()",
8280 &code->expr1->where);
8281 else if (code->expr1->expr_type == EXPR_ARRAY
8282 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
8284 gfc_constructor *cons;
8285 cons = gfc_constructor_first (code->expr1->value.constructor);
8286 for (; cons; cons = gfc_constructor_next (cons))
8287 if (cons->expr->expr_type == EXPR_CONSTANT
8288 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
8289 gfc_error ("Imageset argument at %L must between 1 and "
8290 "num_images()", &cons->expr->where);
8296 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8297 || code->expr2->expr_type != EXPR_VARIABLE))
8298 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8299 &code->expr2->where);
8303 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8304 || code->expr3->expr_type != EXPR_VARIABLE))
8305 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8306 &code->expr3->where);
8310 /* Given a branch to a label, see if the branch is conforming.
8311 The code node describes where the branch is located. */
8314 resolve_branch (gfc_st_label *label, gfc_code *code)
8321 /* Step one: is this a valid branching target? */
8323 if (label->defined == ST_LABEL_UNKNOWN)
8325 gfc_error ("Label %d referenced at %L is never defined", label->value,
8330 if (label->defined != ST_LABEL_TARGET)
8332 gfc_error ("Statement at %L is not a valid branch target statement "
8333 "for the branch statement at %L", &label->where, &code->loc);
8337 /* Step two: make sure this branch is not a branch to itself ;-) */
8339 if (code->here == label)
8341 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
8345 /* Step three: See if the label is in the same block as the
8346 branching statement. The hard work has been done by setting up
8347 the bitmap reachable_labels. */
8349 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
8351 /* Check now whether there is a CRITICAL construct; if so, check
8352 whether the label is still visible outside of the CRITICAL block,
8353 which is invalid. */
8354 for (stack = cs_base; stack; stack = stack->prev)
8355 if (stack->current->op == EXEC_CRITICAL
8356 && bitmap_bit_p (stack->reachable_labels, label->value))
8357 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8358 " at %L", &code->loc, &label->where);
8363 /* Step four: If we haven't found the label in the bitmap, it may
8364 still be the label of the END of the enclosing block, in which
8365 case we find it by going up the code_stack. */
8367 for (stack = cs_base; stack; stack = stack->prev)
8369 if (stack->current->next && stack->current->next->here == label)
8371 if (stack->current->op == EXEC_CRITICAL)
8373 /* Note: A label at END CRITICAL does not leave the CRITICAL
8374 construct as END CRITICAL is still part of it. */
8375 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8376 " at %L", &code->loc, &label->where);
8383 gcc_assert (stack->current->next->op == EXEC_END_NESTED_BLOCK);
8387 /* The label is not in an enclosing block, so illegal. This was
8388 allowed in Fortran 66, so we allow it as extension. No
8389 further checks are necessary in this case. */
8390 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
8391 "as the GOTO statement at %L", &label->where,
8397 /* Check whether EXPR1 has the same shape as EXPR2. */
8400 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
8402 mpz_t shape[GFC_MAX_DIMENSIONS];
8403 mpz_t shape2[GFC_MAX_DIMENSIONS];
8404 gfc_try result = FAILURE;
8407 /* Compare the rank. */
8408 if (expr1->rank != expr2->rank)
8411 /* Compare the size of each dimension. */
8412 for (i=0; i<expr1->rank; i++)
8414 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
8417 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
8420 if (mpz_cmp (shape[i], shape2[i]))
8424 /* When either of the two expression is an assumed size array, we
8425 ignore the comparison of dimension sizes. */
8430 gfc_clear_shape (shape, i);
8431 gfc_clear_shape (shape2, i);
8436 /* Check whether a WHERE assignment target or a WHERE mask expression
8437 has the same shape as the outmost WHERE mask expression. */
8440 resolve_where (gfc_code *code, gfc_expr *mask)
8446 cblock = code->block;
8448 /* Store the first WHERE mask-expr of the WHERE statement or construct.
8449 In case of nested WHERE, only the outmost one is stored. */
8450 if (mask == NULL) /* outmost WHERE */
8452 else /* inner WHERE */
8459 /* Check if the mask-expr has a consistent shape with the
8460 outmost WHERE mask-expr. */
8461 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
8462 gfc_error ("WHERE mask at %L has inconsistent shape",
8463 &cblock->expr1->where);
8466 /* the assignment statement of a WHERE statement, or the first
8467 statement in where-body-construct of a WHERE construct */
8468 cnext = cblock->next;
8473 /* WHERE assignment statement */
8476 /* Check shape consistent for WHERE assignment target. */
8477 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
8478 gfc_error ("WHERE assignment target at %L has "
8479 "inconsistent shape", &cnext->expr1->where);
8483 case EXEC_ASSIGN_CALL:
8484 resolve_call (cnext);
8485 if (!cnext->resolved_sym->attr.elemental)
8486 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8487 &cnext->ext.actual->expr->where);
8490 /* WHERE or WHERE construct is part of a where-body-construct */
8492 resolve_where (cnext, e);
8496 gfc_error ("Unsupported statement inside WHERE at %L",
8499 /* the next statement within the same where-body-construct */
8500 cnext = cnext->next;
8502 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8503 cblock = cblock->block;
8508 /* Resolve assignment in FORALL construct.
8509 NVAR is the number of FORALL index variables, and VAR_EXPR records the
8510 FORALL index variables. */
8513 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
8517 for (n = 0; n < nvar; n++)
8519 gfc_symbol *forall_index;
8521 forall_index = var_expr[n]->symtree->n.sym;
8523 /* Check whether the assignment target is one of the FORALL index
8525 if ((code->expr1->expr_type == EXPR_VARIABLE)
8526 && (code->expr1->symtree->n.sym == forall_index))
8527 gfc_error ("Assignment to a FORALL index variable at %L",
8528 &code->expr1->where);
8531 /* If one of the FORALL index variables doesn't appear in the
8532 assignment variable, then there could be a many-to-one
8533 assignment. Emit a warning rather than an error because the
8534 mask could be resolving this problem. */
8535 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
8536 gfc_warning ("The FORALL with index '%s' is not used on the "
8537 "left side of the assignment at %L and so might "
8538 "cause multiple assignment to this object",
8539 var_expr[n]->symtree->name, &code->expr1->where);
8545 /* Resolve WHERE statement in FORALL construct. */
8548 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
8549 gfc_expr **var_expr)
8554 cblock = code->block;
8557 /* the assignment statement of a WHERE statement, or the first
8558 statement in where-body-construct of a WHERE construct */
8559 cnext = cblock->next;
8564 /* WHERE assignment statement */
8566 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
8569 /* WHERE operator assignment statement */
8570 case EXEC_ASSIGN_CALL:
8571 resolve_call (cnext);
8572 if (!cnext->resolved_sym->attr.elemental)
8573 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8574 &cnext->ext.actual->expr->where);
8577 /* WHERE or WHERE construct is part of a where-body-construct */
8579 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
8583 gfc_error ("Unsupported statement inside WHERE at %L",
8586 /* the next statement within the same where-body-construct */
8587 cnext = cnext->next;
8589 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8590 cblock = cblock->block;
8595 /* Traverse the FORALL body to check whether the following errors exist:
8596 1. For assignment, check if a many-to-one assignment happens.
8597 2. For WHERE statement, check the WHERE body to see if there is any
8598 many-to-one assignment. */
8601 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8605 c = code->block->next;
8611 case EXEC_POINTER_ASSIGN:
8612 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8615 case EXEC_ASSIGN_CALL:
8619 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8620 there is no need to handle it here. */
8624 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8629 /* The next statement in the FORALL body. */
8635 /* Counts the number of iterators needed inside a forall construct, including
8636 nested forall constructs. This is used to allocate the needed memory
8637 in gfc_resolve_forall. */
8640 gfc_count_forall_iterators (gfc_code *code)
8642 int max_iters, sub_iters, current_iters;
8643 gfc_forall_iterator *fa;
8645 gcc_assert(code->op == EXEC_FORALL);
8649 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8652 code = code->block->next;
8656 if (code->op == EXEC_FORALL)
8658 sub_iters = gfc_count_forall_iterators (code);
8659 if (sub_iters > max_iters)
8660 max_iters = sub_iters;
8665 return current_iters + max_iters;
8669 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8670 gfc_resolve_forall_body to resolve the FORALL body. */
8673 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8675 static gfc_expr **var_expr;
8676 static int total_var = 0;
8677 static int nvar = 0;
8679 gfc_forall_iterator *fa;
8684 /* Start to resolve a FORALL construct */
8685 if (forall_save == 0)
8687 /* Count the total number of FORALL index in the nested FORALL
8688 construct in order to allocate the VAR_EXPR with proper size. */
8689 total_var = gfc_count_forall_iterators (code);
8691 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8692 var_expr = XCNEWVEC (gfc_expr *, total_var);
8695 /* The information about FORALL iterator, including FORALL index start, end
8696 and stride. The FORALL index can not appear in start, end or stride. */
8697 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8699 /* Check if any outer FORALL index name is the same as the current
8701 for (i = 0; i < nvar; i++)
8703 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8705 gfc_error ("An outer FORALL construct already has an index "
8706 "with this name %L", &fa->var->where);
8710 /* Record the current FORALL index. */
8711 var_expr[nvar] = gfc_copy_expr (fa->var);
8715 /* No memory leak. */
8716 gcc_assert (nvar <= total_var);
8719 /* Resolve the FORALL body. */
8720 gfc_resolve_forall_body (code, nvar, var_expr);
8722 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8723 gfc_resolve_blocks (code->block, ns);
8727 /* Free only the VAR_EXPRs allocated in this frame. */
8728 for (i = nvar; i < tmp; i++)
8729 gfc_free_expr (var_expr[i]);
8733 /* We are in the outermost FORALL construct. */
8734 gcc_assert (forall_save == 0);
8736 /* VAR_EXPR is not needed any more. */
8743 /* Resolve a BLOCK construct statement. */
8746 resolve_block_construct (gfc_code* code)
8748 /* Resolve the BLOCK's namespace. */
8749 gfc_resolve (code->ext.block.ns);
8751 /* For an ASSOCIATE block, the associations (and their targets) are already
8752 resolved during resolve_symbol. */
8756 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8759 static void resolve_code (gfc_code *, gfc_namespace *);
8762 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8766 for (; b; b = b->block)
8768 t = gfc_resolve_expr (b->expr1);
8769 if (gfc_resolve_expr (b->expr2) == FAILURE)
8775 if (t == SUCCESS && b->expr1 != NULL
8776 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8777 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8784 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8785 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8790 resolve_branch (b->label1, b);
8794 resolve_block_construct (b);
8798 case EXEC_SELECT_TYPE:
8809 case EXEC_OMP_ATOMIC:
8810 case EXEC_OMP_CRITICAL:
8812 case EXEC_OMP_MASTER:
8813 case EXEC_OMP_ORDERED:
8814 case EXEC_OMP_PARALLEL:
8815 case EXEC_OMP_PARALLEL_DO:
8816 case EXEC_OMP_PARALLEL_SECTIONS:
8817 case EXEC_OMP_PARALLEL_WORKSHARE:
8818 case EXEC_OMP_SECTIONS:
8819 case EXEC_OMP_SINGLE:
8821 case EXEC_OMP_TASKWAIT:
8822 case EXEC_OMP_TASKYIELD:
8823 case EXEC_OMP_WORKSHARE:
8827 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8830 resolve_code (b->next, ns);
8835 /* Does everything to resolve an ordinary assignment. Returns true
8836 if this is an interface assignment. */
8838 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8848 if (gfc_extend_assign (code, ns) == SUCCESS)
8852 if (code->op == EXEC_ASSIGN_CALL)
8854 lhs = code->ext.actual->expr;
8855 rhsptr = &code->ext.actual->next->expr;
8859 gfc_actual_arglist* args;
8860 gfc_typebound_proc* tbp;
8862 gcc_assert (code->op == EXEC_COMPCALL);
8864 args = code->expr1->value.compcall.actual;
8866 rhsptr = &args->next->expr;
8868 tbp = code->expr1->value.compcall.tbp;
8869 gcc_assert (!tbp->is_generic);
8872 /* Make a temporary rhs when there is a default initializer
8873 and rhs is the same symbol as the lhs. */
8874 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8875 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8876 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8877 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8878 *rhsptr = gfc_get_parentheses (*rhsptr);
8887 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8888 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8889 &code->loc) == FAILURE)
8892 /* Handle the case of a BOZ literal on the RHS. */
8893 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8896 if (gfc_option.warn_surprising)
8897 gfc_warning ("BOZ literal at %L is bitwise transferred "
8898 "non-integer symbol '%s'", &code->loc,
8899 lhs->symtree->n.sym->name);
8901 if (!gfc_convert_boz (rhs, &lhs->ts))
8903 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8905 if (rc == ARITH_UNDERFLOW)
8906 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8907 ". This check can be disabled with the option "
8908 "-fno-range-check", &rhs->where);
8909 else if (rc == ARITH_OVERFLOW)
8910 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8911 ". This check can be disabled with the option "
8912 "-fno-range-check", &rhs->where);
8913 else if (rc == ARITH_NAN)
8914 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8915 ". This check can be disabled with the option "
8916 "-fno-range-check", &rhs->where);
8921 if (lhs->ts.type == BT_CHARACTER
8922 && gfc_option.warn_character_truncation)
8924 if (lhs->ts.u.cl != NULL
8925 && lhs->ts.u.cl->length != NULL
8926 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8927 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8929 if (rhs->expr_type == EXPR_CONSTANT)
8930 rlen = rhs->value.character.length;
8932 else if (rhs->ts.u.cl != NULL
8933 && rhs->ts.u.cl->length != NULL
8934 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8935 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8937 if (rlen && llen && rlen > llen)
8938 gfc_warning_now ("CHARACTER expression will be truncated "
8939 "in assignment (%d/%d) at %L",
8940 llen, rlen, &code->loc);
8943 /* Ensure that a vector index expression for the lvalue is evaluated
8944 to a temporary if the lvalue symbol is referenced in it. */
8947 for (ref = lhs->ref; ref; ref= ref->next)
8948 if (ref->type == REF_ARRAY)
8950 for (n = 0; n < ref->u.ar.dimen; n++)
8951 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8952 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8953 ref->u.ar.start[n]))
8955 = gfc_get_parentheses (ref->u.ar.start[n]);
8959 if (gfc_pure (NULL))
8961 if (lhs->ts.type == BT_DERIVED
8962 && lhs->expr_type == EXPR_VARIABLE
8963 && lhs->ts.u.derived->attr.pointer_comp
8964 && rhs->expr_type == EXPR_VARIABLE
8965 && (gfc_impure_variable (rhs->symtree->n.sym)
8966 || gfc_is_coindexed (rhs)))
8969 if (gfc_is_coindexed (rhs))
8970 gfc_error ("Coindexed expression at %L is assigned to "
8971 "a derived type variable with a POINTER "
8972 "component in a PURE procedure",
8975 gfc_error ("The impure variable at %L is assigned to "
8976 "a derived type variable with a POINTER "
8977 "component in a PURE procedure (12.6)",
8982 /* Fortran 2008, C1283. */
8983 if (gfc_is_coindexed (lhs))
8985 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8986 "procedure", &rhs->where);
8991 if (gfc_implicit_pure (NULL))
8993 if (lhs->expr_type == EXPR_VARIABLE
8994 && lhs->symtree->n.sym != gfc_current_ns->proc_name
8995 && lhs->symtree->n.sym->ns != gfc_current_ns)
8996 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8998 if (lhs->ts.type == BT_DERIVED
8999 && lhs->expr_type == EXPR_VARIABLE
9000 && lhs->ts.u.derived->attr.pointer_comp
9001 && rhs->expr_type == EXPR_VARIABLE
9002 && (gfc_impure_variable (rhs->symtree->n.sym)
9003 || gfc_is_coindexed (rhs)))
9004 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9006 /* Fortran 2008, C1283. */
9007 if (gfc_is_coindexed (lhs))
9008 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9012 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
9013 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
9014 if (lhs->ts.type == BT_CLASS)
9016 gfc_error ("Variable must not be polymorphic in assignment at %L",
9021 /* F2008, Section 7.2.1.2. */
9022 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
9024 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
9025 "component in assignment at %L", &lhs->where);
9029 gfc_check_assign (lhs, rhs, 1);
9034 /* Given a block of code, recursively resolve everything pointed to by this
9038 resolve_code (gfc_code *code, gfc_namespace *ns)
9040 int omp_workshare_save;
9045 frame.prev = cs_base;
9049 find_reachable_labels (code);
9051 for (; code; code = code->next)
9053 frame.current = code;
9054 forall_save = forall_flag;
9056 if (code->op == EXEC_FORALL)
9059 gfc_resolve_forall (code, ns, forall_save);
9062 else if (code->block)
9064 omp_workshare_save = -1;
9067 case EXEC_OMP_PARALLEL_WORKSHARE:
9068 omp_workshare_save = omp_workshare_flag;
9069 omp_workshare_flag = 1;
9070 gfc_resolve_omp_parallel_blocks (code, ns);
9072 case EXEC_OMP_PARALLEL:
9073 case EXEC_OMP_PARALLEL_DO:
9074 case EXEC_OMP_PARALLEL_SECTIONS:
9076 omp_workshare_save = omp_workshare_flag;
9077 omp_workshare_flag = 0;
9078 gfc_resolve_omp_parallel_blocks (code, ns);
9081 gfc_resolve_omp_do_blocks (code, ns);
9083 case EXEC_SELECT_TYPE:
9084 /* Blocks are handled in resolve_select_type because we have
9085 to transform the SELECT TYPE into ASSOCIATE first. */
9087 case EXEC_OMP_WORKSHARE:
9088 omp_workshare_save = omp_workshare_flag;
9089 omp_workshare_flag = 1;
9092 gfc_resolve_blocks (code->block, ns);
9096 if (omp_workshare_save != -1)
9097 omp_workshare_flag = omp_workshare_save;
9101 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
9102 t = gfc_resolve_expr (code->expr1);
9103 forall_flag = forall_save;
9105 if (gfc_resolve_expr (code->expr2) == FAILURE)
9108 if (code->op == EXEC_ALLOCATE
9109 && gfc_resolve_expr (code->expr3) == FAILURE)
9115 case EXEC_END_BLOCK:
9116 case EXEC_END_NESTED_BLOCK:
9120 case EXEC_ERROR_STOP:
9124 case EXEC_ASSIGN_CALL:
9129 case EXEC_SYNC_IMAGES:
9130 case EXEC_SYNC_MEMORY:
9131 resolve_sync (code);
9136 resolve_lock_unlock (code);
9140 /* Keep track of which entry we are up to. */
9141 current_entry_id = code->ext.entry->id;
9145 resolve_where (code, NULL);
9149 if (code->expr1 != NULL)
9151 if (code->expr1->ts.type != BT_INTEGER)
9152 gfc_error ("ASSIGNED GOTO statement at %L requires an "
9153 "INTEGER variable", &code->expr1->where);
9154 else if (code->expr1->symtree->n.sym->attr.assign != 1)
9155 gfc_error ("Variable '%s' has not been assigned a target "
9156 "label at %L", code->expr1->symtree->n.sym->name,
9157 &code->expr1->where);
9160 resolve_branch (code->label1, code);
9164 if (code->expr1 != NULL
9165 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
9166 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
9167 "INTEGER return specifier", &code->expr1->where);
9170 case EXEC_INIT_ASSIGN:
9171 case EXEC_END_PROCEDURE:
9178 if (gfc_check_vardef_context (code->expr1, false, false,
9179 _("assignment")) == FAILURE)
9182 if (resolve_ordinary_assign (code, ns))
9184 if (code->op == EXEC_COMPCALL)
9191 case EXEC_LABEL_ASSIGN:
9192 if (code->label1->defined == ST_LABEL_UNKNOWN)
9193 gfc_error ("Label %d referenced at %L is never defined",
9194 code->label1->value, &code->label1->where);
9196 && (code->expr1->expr_type != EXPR_VARIABLE
9197 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
9198 || code->expr1->symtree->n.sym->ts.kind
9199 != gfc_default_integer_kind
9200 || code->expr1->symtree->n.sym->as != NULL))
9201 gfc_error ("ASSIGN statement at %L requires a scalar "
9202 "default INTEGER variable", &code->expr1->where);
9205 case EXEC_POINTER_ASSIGN:
9212 /* This is both a variable definition and pointer assignment
9213 context, so check both of them. For rank remapping, a final
9214 array ref may be present on the LHS and fool gfc_expr_attr
9215 used in gfc_check_vardef_context. Remove it. */
9216 e = remove_last_array_ref (code->expr1);
9217 t = gfc_check_vardef_context (e, true, false,
9218 _("pointer assignment"));
9220 t = gfc_check_vardef_context (e, false, false,
9221 _("pointer assignment"));
9226 gfc_check_pointer_assign (code->expr1, code->expr2);
9230 case EXEC_ARITHMETIC_IF:
9232 && code->expr1->ts.type != BT_INTEGER
9233 && code->expr1->ts.type != BT_REAL)
9234 gfc_error ("Arithmetic IF statement at %L requires a numeric "
9235 "expression", &code->expr1->where);
9237 resolve_branch (code->label1, code);
9238 resolve_branch (code->label2, code);
9239 resolve_branch (code->label3, code);
9243 if (t == SUCCESS && code->expr1 != NULL
9244 && (code->expr1->ts.type != BT_LOGICAL
9245 || code->expr1->rank != 0))
9246 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
9247 &code->expr1->where);
9252 resolve_call (code);
9257 resolve_typebound_subroutine (code);
9261 resolve_ppc_call (code);
9265 /* Select is complicated. Also, a SELECT construct could be
9266 a transformed computed GOTO. */
9267 resolve_select (code);
9270 case EXEC_SELECT_TYPE:
9271 resolve_select_type (code, ns);
9275 resolve_block_construct (code);
9279 if (code->ext.iterator != NULL)
9281 gfc_iterator *iter = code->ext.iterator;
9282 if (gfc_resolve_iterator (iter, true) != FAILURE)
9283 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
9288 if (code->expr1 == NULL)
9289 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
9291 && (code->expr1->rank != 0
9292 || code->expr1->ts.type != BT_LOGICAL))
9293 gfc_error ("Exit condition of DO WHILE loop at %L must be "
9294 "a scalar LOGICAL expression", &code->expr1->where);
9299 resolve_allocate_deallocate (code, "ALLOCATE");
9303 case EXEC_DEALLOCATE:
9305 resolve_allocate_deallocate (code, "DEALLOCATE");
9310 if (gfc_resolve_open (code->ext.open) == FAILURE)
9313 resolve_branch (code->ext.open->err, code);
9317 if (gfc_resolve_close (code->ext.close) == FAILURE)
9320 resolve_branch (code->ext.close->err, code);
9323 case EXEC_BACKSPACE:
9327 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
9330 resolve_branch (code->ext.filepos->err, code);
9334 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9337 resolve_branch (code->ext.inquire->err, code);
9341 gcc_assert (code->ext.inquire != NULL);
9342 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9345 resolve_branch (code->ext.inquire->err, code);
9349 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
9352 resolve_branch (code->ext.wait->err, code);
9353 resolve_branch (code->ext.wait->end, code);
9354 resolve_branch (code->ext.wait->eor, code);
9359 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
9362 resolve_branch (code->ext.dt->err, code);
9363 resolve_branch (code->ext.dt->end, code);
9364 resolve_branch (code->ext.dt->eor, code);
9368 resolve_transfer (code);
9372 resolve_forall_iterators (code->ext.forall_iterator);
9374 if (code->expr1 != NULL
9375 && (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank))
9376 gfc_error ("FORALL mask clause at %L requires a scalar LOGICAL "
9377 "expression", &code->expr1->where);
9380 case EXEC_OMP_ATOMIC:
9381 case EXEC_OMP_BARRIER:
9382 case EXEC_OMP_CRITICAL:
9383 case EXEC_OMP_FLUSH:
9385 case EXEC_OMP_MASTER:
9386 case EXEC_OMP_ORDERED:
9387 case EXEC_OMP_SECTIONS:
9388 case EXEC_OMP_SINGLE:
9389 case EXEC_OMP_TASKWAIT:
9390 case EXEC_OMP_TASKYIELD:
9391 case EXEC_OMP_WORKSHARE:
9392 gfc_resolve_omp_directive (code, ns);
9395 case EXEC_OMP_PARALLEL:
9396 case EXEC_OMP_PARALLEL_DO:
9397 case EXEC_OMP_PARALLEL_SECTIONS:
9398 case EXEC_OMP_PARALLEL_WORKSHARE:
9400 omp_workshare_save = omp_workshare_flag;
9401 omp_workshare_flag = 0;
9402 gfc_resolve_omp_directive (code, ns);
9403 omp_workshare_flag = omp_workshare_save;
9407 gfc_internal_error ("resolve_code(): Bad statement code");
9411 cs_base = frame.prev;
9415 /* Resolve initial values and make sure they are compatible with
9419 resolve_values (gfc_symbol *sym)
9423 if (sym->value == NULL)
9426 if (sym->value->expr_type == EXPR_STRUCTURE)
9427 t= resolve_structure_cons (sym->value, 1);
9429 t = gfc_resolve_expr (sym->value);
9434 gfc_check_assign_symbol (sym, sym->value);
9438 /* Verify the binding labels for common blocks that are BIND(C). The label
9439 for a BIND(C) common block must be identical in all scoping units in which
9440 the common block is declared. Further, the binding label can not collide
9441 with any other global entity in the program. */
9444 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
9446 if (comm_block_tree->n.common->is_bind_c == 1)
9448 gfc_gsymbol *binding_label_gsym;
9449 gfc_gsymbol *comm_name_gsym;
9451 /* See if a global symbol exists by the common block's name. It may
9452 be NULL if the common block is use-associated. */
9453 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
9454 comm_block_tree->n.common->name);
9455 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
9456 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
9457 "with the global entity '%s' at %L",
9458 comm_block_tree->n.common->binding_label,
9459 comm_block_tree->n.common->name,
9460 &(comm_block_tree->n.common->where),
9461 comm_name_gsym->name, &(comm_name_gsym->where));
9462 else if (comm_name_gsym != NULL
9463 && strcmp (comm_name_gsym->name,
9464 comm_block_tree->n.common->name) == 0)
9466 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
9468 if (comm_name_gsym->binding_label == NULL)
9469 /* No binding label for common block stored yet; save this one. */
9470 comm_name_gsym->binding_label =
9471 comm_block_tree->n.common->binding_label;
9473 if (strcmp (comm_name_gsym->binding_label,
9474 comm_block_tree->n.common->binding_label) != 0)
9476 /* Common block names match but binding labels do not. */
9477 gfc_error ("Binding label '%s' for common block '%s' at %L "
9478 "does not match the binding label '%s' for common "
9480 comm_block_tree->n.common->binding_label,
9481 comm_block_tree->n.common->name,
9482 &(comm_block_tree->n.common->where),
9483 comm_name_gsym->binding_label,
9484 comm_name_gsym->name,
9485 &(comm_name_gsym->where));
9490 /* There is no binding label (NAME="") so we have nothing further to
9491 check and nothing to add as a global symbol for the label. */
9492 if (comm_block_tree->n.common->binding_label[0] == '\0' )
9495 binding_label_gsym =
9496 gfc_find_gsymbol (gfc_gsym_root,
9497 comm_block_tree->n.common->binding_label);
9498 if (binding_label_gsym == NULL)
9500 /* Need to make a global symbol for the binding label to prevent
9501 it from colliding with another. */
9502 binding_label_gsym =
9503 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
9504 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
9505 binding_label_gsym->type = GSYM_COMMON;
9509 /* If comm_name_gsym is NULL, the name common block is use
9510 associated and the name could be colliding. */
9511 if (binding_label_gsym->type != GSYM_COMMON)
9512 gfc_error ("Binding label '%s' for common block '%s' at %L "
9513 "collides with the global entity '%s' at %L",
9514 comm_block_tree->n.common->binding_label,
9515 comm_block_tree->n.common->name,
9516 &(comm_block_tree->n.common->where),
9517 binding_label_gsym->name,
9518 &(binding_label_gsym->where));
9519 else if (comm_name_gsym != NULL
9520 && (strcmp (binding_label_gsym->name,
9521 comm_name_gsym->binding_label) != 0)
9522 && (strcmp (binding_label_gsym->sym_name,
9523 comm_name_gsym->name) != 0))
9524 gfc_error ("Binding label '%s' for common block '%s' at %L "
9525 "collides with global entity '%s' at %L",
9526 binding_label_gsym->name, binding_label_gsym->sym_name,
9527 &(comm_block_tree->n.common->where),
9528 comm_name_gsym->name, &(comm_name_gsym->where));
9536 /* Verify any BIND(C) derived types in the namespace so we can report errors
9537 for them once, rather than for each variable declared of that type. */
9540 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
9542 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
9543 && derived_sym->attr.is_bind_c == 1)
9544 verify_bind_c_derived_type (derived_sym);
9550 /* Verify that any binding labels used in a given namespace do not collide
9551 with the names or binding labels of any global symbols. */
9554 gfc_verify_binding_labels (gfc_symbol *sym)
9558 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
9559 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
9561 gfc_gsymbol *bind_c_sym;
9563 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
9564 if (bind_c_sym != NULL
9565 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
9567 if (sym->attr.if_source == IFSRC_DECL
9568 && (bind_c_sym->type != GSYM_SUBROUTINE
9569 && bind_c_sym->type != GSYM_FUNCTION)
9570 && ((sym->attr.contained == 1
9571 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
9572 || (sym->attr.use_assoc == 1
9573 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
9575 /* Make sure global procedures don't collide with anything. */
9576 gfc_error ("Binding label '%s' at %L collides with the global "
9577 "entity '%s' at %L", sym->binding_label,
9578 &(sym->declared_at), bind_c_sym->name,
9579 &(bind_c_sym->where));
9582 else if (sym->attr.contained == 0
9583 && (sym->attr.if_source == IFSRC_IFBODY
9584 && sym->attr.flavor == FL_PROCEDURE)
9585 && (bind_c_sym->sym_name != NULL
9586 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
9588 /* Make sure procedures in interface bodies don't collide. */
9589 gfc_error ("Binding label '%s' in interface body at %L collides "
9590 "with the global entity '%s' at %L",
9592 &(sym->declared_at), bind_c_sym->name,
9593 &(bind_c_sym->where));
9596 else if (sym->attr.contained == 0
9597 && sym->attr.if_source == IFSRC_UNKNOWN)
9598 if ((sym->attr.use_assoc && bind_c_sym->mod_name
9599 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
9600 || sym->attr.use_assoc == 0)
9602 gfc_error ("Binding label '%s' at %L collides with global "
9603 "entity '%s' at %L", sym->binding_label,
9604 &(sym->declared_at), bind_c_sym->name,
9605 &(bind_c_sym->where));
9610 /* Clear the binding label to prevent checking multiple times. */
9611 sym->binding_label[0] = '\0';
9613 else if (bind_c_sym == NULL)
9615 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
9616 bind_c_sym->where = sym->declared_at;
9617 bind_c_sym->sym_name = sym->name;
9619 if (sym->attr.use_assoc == 1)
9620 bind_c_sym->mod_name = sym->module;
9622 if (sym->ns->proc_name != NULL)
9623 bind_c_sym->mod_name = sym->ns->proc_name->name;
9625 if (sym->attr.contained == 0)
9627 if (sym->attr.subroutine)
9628 bind_c_sym->type = GSYM_SUBROUTINE;
9629 else if (sym->attr.function)
9630 bind_c_sym->type = GSYM_FUNCTION;
9638 /* Resolve an index expression. */
9641 resolve_index_expr (gfc_expr *e)
9643 if (gfc_resolve_expr (e) == FAILURE)
9646 if (gfc_simplify_expr (e, 0) == FAILURE)
9649 if (gfc_specification_expr (e) == FAILURE)
9656 /* Resolve a charlen structure. */
9659 resolve_charlen (gfc_charlen *cl)
9668 specification_expr = 1;
9670 if (resolve_index_expr (cl->length) == FAILURE)
9672 specification_expr = 0;
9676 /* "If the character length parameter value evaluates to a negative
9677 value, the length of character entities declared is zero." */
9678 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9680 if (gfc_option.warn_surprising)
9681 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9682 " the length has been set to zero",
9683 &cl->length->where, i);
9684 gfc_replace_expr (cl->length,
9685 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9688 /* Check that the character length is not too large. */
9689 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9690 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9691 && cl->length->ts.type == BT_INTEGER
9692 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9694 gfc_error ("String length at %L is too large", &cl->length->where);
9702 /* Test for non-constant shape arrays. */
9705 is_non_constant_shape_array (gfc_symbol *sym)
9711 not_constant = false;
9712 if (sym->as != NULL)
9714 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9715 has not been simplified; parameter array references. Do the
9716 simplification now. */
9717 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9719 e = sym->as->lower[i];
9720 if (e && (resolve_index_expr (e) == FAILURE
9721 || !gfc_is_constant_expr (e)))
9722 not_constant = true;
9723 e = sym->as->upper[i];
9724 if (e && (resolve_index_expr (e) == FAILURE
9725 || !gfc_is_constant_expr (e)))
9726 not_constant = true;
9729 return not_constant;
9732 /* Given a symbol and an initialization expression, add code to initialize
9733 the symbol to the function entry. */
9735 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9739 gfc_namespace *ns = sym->ns;
9741 /* Search for the function namespace if this is a contained
9742 function without an explicit result. */
9743 if (sym->attr.function && sym == sym->result
9744 && sym->name != sym->ns->proc_name->name)
9747 for (;ns; ns = ns->sibling)
9748 if (strcmp (ns->proc_name->name, sym->name) == 0)
9754 gfc_free_expr (init);
9758 /* Build an l-value expression for the result. */
9759 lval = gfc_lval_expr_from_sym (sym);
9761 /* Add the code at scope entry. */
9762 init_st = gfc_get_code ();
9763 init_st->next = ns->code;
9766 /* Assign the default initializer to the l-value. */
9767 init_st->loc = sym->declared_at;
9768 init_st->op = EXEC_INIT_ASSIGN;
9769 init_st->expr1 = lval;
9770 init_st->expr2 = init;
9773 /* Assign the default initializer to a derived type variable or result. */
9776 apply_default_init (gfc_symbol *sym)
9778 gfc_expr *init = NULL;
9780 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9783 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9784 init = gfc_default_initializer (&sym->ts);
9786 if (init == NULL && sym->ts.type != BT_CLASS)
9789 build_init_assign (sym, init);
9790 sym->attr.referenced = 1;
9793 /* Build an initializer for a local integer, real, complex, logical, or
9794 character variable, based on the command line flags finit-local-zero,
9795 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9796 null if the symbol should not have a default initialization. */
9798 build_default_init_expr (gfc_symbol *sym)
9801 gfc_expr *init_expr;
9804 /* These symbols should never have a default initialization. */
9805 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9806 || sym->attr.external
9808 || sym->attr.pointer
9809 || sym->attr.in_equivalence
9810 || sym->attr.in_common
9813 || sym->attr.cray_pointee
9814 || sym->attr.cray_pointer)
9817 /* Now we'll try to build an initializer expression. */
9818 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9821 /* We will only initialize integers, reals, complex, logicals, and
9822 characters, and only if the corresponding command-line flags
9823 were set. Otherwise, we free init_expr and return null. */
9824 switch (sym->ts.type)
9827 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9828 mpz_set_si (init_expr->value.integer,
9829 gfc_option.flag_init_integer_value);
9832 gfc_free_expr (init_expr);
9838 switch (gfc_option.flag_init_real)
9840 case GFC_INIT_REAL_SNAN:
9841 init_expr->is_snan = 1;
9843 case GFC_INIT_REAL_NAN:
9844 mpfr_set_nan (init_expr->value.real);
9847 case GFC_INIT_REAL_INF:
9848 mpfr_set_inf (init_expr->value.real, 1);
9851 case GFC_INIT_REAL_NEG_INF:
9852 mpfr_set_inf (init_expr->value.real, -1);
9855 case GFC_INIT_REAL_ZERO:
9856 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9860 gfc_free_expr (init_expr);
9867 switch (gfc_option.flag_init_real)
9869 case GFC_INIT_REAL_SNAN:
9870 init_expr->is_snan = 1;
9872 case GFC_INIT_REAL_NAN:
9873 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9874 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9877 case GFC_INIT_REAL_INF:
9878 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9879 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9882 case GFC_INIT_REAL_NEG_INF:
9883 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9884 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9887 case GFC_INIT_REAL_ZERO:
9888 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9892 gfc_free_expr (init_expr);
9899 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9900 init_expr->value.logical = 0;
9901 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9902 init_expr->value.logical = 1;
9905 gfc_free_expr (init_expr);
9911 /* For characters, the length must be constant in order to
9912 create a default initializer. */
9913 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9914 && sym->ts.u.cl->length
9915 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9917 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9918 init_expr->value.character.length = char_len;
9919 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9920 for (i = 0; i < char_len; i++)
9921 init_expr->value.character.string[i]
9922 = (unsigned char) gfc_option.flag_init_character_value;
9926 gfc_free_expr (init_expr);
9932 gfc_free_expr (init_expr);
9938 /* Add an initialization expression to a local variable. */
9940 apply_default_init_local (gfc_symbol *sym)
9942 gfc_expr *init = NULL;
9944 /* The symbol should be a variable or a function return value. */
9945 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9946 || (sym->attr.function && sym->result != sym))
9949 /* Try to build the initializer expression. If we can't initialize
9950 this symbol, then init will be NULL. */
9951 init = build_default_init_expr (sym);
9955 /* For saved variables, we don't want to add an initializer at
9956 function entry, so we just add a static initializer. */
9957 if (sym->attr.save || sym->ns->save_all
9958 || gfc_option.flag_max_stack_var_size == 0)
9960 /* Don't clobber an existing initializer! */
9961 gcc_assert (sym->value == NULL);
9966 build_init_assign (sym, init);
9970 /* Resolution of common features of flavors variable and procedure. */
9973 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9975 /* Avoid double diagnostics for function result symbols. */
9976 if ((sym->result || sym->attr.result) && !sym->attr.dummy
9977 && (sym->ns != gfc_current_ns))
9980 /* Constraints on deferred shape variable. */
9981 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9983 if (sym->attr.allocatable)
9985 if (sym->attr.dimension)
9987 gfc_error ("Allocatable array '%s' at %L must have "
9988 "a deferred shape", sym->name, &sym->declared_at);
9991 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9992 "may not be ALLOCATABLE", sym->name,
9993 &sym->declared_at) == FAILURE)
9997 if (sym->attr.pointer && sym->attr.dimension)
9999 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
10000 sym->name, &sym->declared_at);
10006 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
10007 && sym->ts.type != BT_CLASS && !sym->assoc)
10009 gfc_error ("Array '%s' at %L cannot have a deferred shape",
10010 sym->name, &sym->declared_at);
10015 /* Constraints on polymorphic variables. */
10016 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
10019 if (sym->attr.class_ok
10020 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
10022 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
10023 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
10024 &sym->declared_at);
10029 /* Assume that use associated symbols were checked in the module ns.
10030 Class-variables that are associate-names are also something special
10031 and excepted from the test. */
10032 if (!sym->attr.class_ok && !sym->attr.use_assoc && !sym->assoc)
10034 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
10035 "or pointer", sym->name, &sym->declared_at);
10044 /* Additional checks for symbols with flavor variable and derived
10045 type. To be called from resolve_fl_variable. */
10048 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
10050 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
10052 /* Check to see if a derived type is blocked from being host
10053 associated by the presence of another class I symbol in the same
10054 namespace. 14.6.1.3 of the standard and the discussion on
10055 comp.lang.fortran. */
10056 if (sym->ns != sym->ts.u.derived->ns
10057 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
10060 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
10061 if (s && s->attr.flavor != FL_DERIVED)
10063 gfc_error ("The type '%s' cannot be host associated at %L "
10064 "because it is blocked by an incompatible object "
10065 "of the same name declared at %L",
10066 sym->ts.u.derived->name, &sym->declared_at,
10072 /* 4th constraint in section 11.3: "If an object of a type for which
10073 component-initialization is specified (R429) appears in the
10074 specification-part of a module and does not have the ALLOCATABLE
10075 or POINTER attribute, the object shall have the SAVE attribute."
10077 The check for initializers is performed with
10078 gfc_has_default_initializer because gfc_default_initializer generates
10079 a hidden default for allocatable components. */
10080 if (!(sym->value || no_init_flag) && sym->ns->proc_name
10081 && sym->ns->proc_name->attr.flavor == FL_MODULE
10082 && !sym->ns->save_all && !sym->attr.save
10083 && !sym->attr.pointer && !sym->attr.allocatable
10084 && gfc_has_default_initializer (sym->ts.u.derived)
10085 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
10086 "module variable '%s' at %L, needed due to "
10087 "the default initialization", sym->name,
10088 &sym->declared_at) == FAILURE)
10091 /* Assign default initializer. */
10092 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
10093 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
10095 sym->value = gfc_default_initializer (&sym->ts);
10102 /* Resolve symbols with flavor variable. */
10105 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
10107 int no_init_flag, automatic_flag;
10109 const char *auto_save_msg;
10111 auto_save_msg = "Automatic object '%s' at %L cannot have the "
10114 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10117 /* Set this flag to check that variables are parameters of all entries.
10118 This check is effected by the call to gfc_resolve_expr through
10119 is_non_constant_shape_array. */
10120 specification_expr = 1;
10122 if (sym->ns->proc_name
10123 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10124 || sym->ns->proc_name->attr.is_main_program)
10125 && !sym->attr.use_assoc
10126 && !sym->attr.allocatable
10127 && !sym->attr.pointer
10128 && is_non_constant_shape_array (sym))
10130 /* The shape of a main program or module array needs to be
10132 gfc_error ("The module or main program array '%s' at %L must "
10133 "have constant shape", sym->name, &sym->declared_at);
10134 specification_expr = 0;
10138 /* Constraints on deferred type parameter. */
10139 if (sym->ts.deferred && !(sym->attr.pointer || sym->attr.allocatable))
10141 gfc_error ("Entity '%s' at %L has a deferred type parameter and "
10142 "requires either the pointer or allocatable attribute",
10143 sym->name, &sym->declared_at);
10147 if (sym->ts.type == BT_CHARACTER)
10149 /* Make sure that character string variables with assumed length are
10150 dummy arguments. */
10151 e = sym->ts.u.cl->length;
10152 if (e == NULL && !sym->attr.dummy && !sym->attr.result
10153 && !sym->ts.deferred)
10155 gfc_error ("Entity with assumed character length at %L must be a "
10156 "dummy argument or a PARAMETER", &sym->declared_at);
10160 if (e && sym->attr.save == SAVE_EXPLICIT && !gfc_is_constant_expr (e))
10162 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10166 if (!gfc_is_constant_expr (e)
10167 && !(e->expr_type == EXPR_VARIABLE
10168 && e->symtree->n.sym->attr.flavor == FL_PARAMETER))
10170 if (!sym->attr.use_assoc && sym->ns->proc_name
10171 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10172 || sym->ns->proc_name->attr.is_main_program))
10174 gfc_error ("'%s' at %L must have constant character length "
10175 "in this context", sym->name, &sym->declared_at);
10178 if (sym->attr.in_common)
10180 gfc_error ("COMMON variable '%s' at %L must have constant "
10181 "character length", sym->name, &sym->declared_at);
10187 if (sym->value == NULL && sym->attr.referenced)
10188 apply_default_init_local (sym); /* Try to apply a default initialization. */
10190 /* Determine if the symbol may not have an initializer. */
10191 no_init_flag = automatic_flag = 0;
10192 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
10193 || sym->attr.intrinsic || sym->attr.result)
10195 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
10196 && is_non_constant_shape_array (sym))
10198 no_init_flag = automatic_flag = 1;
10200 /* Also, they must not have the SAVE attribute.
10201 SAVE_IMPLICIT is checked below. */
10202 if (sym->as && sym->attr.codimension)
10204 int corank = sym->as->corank;
10205 sym->as->corank = 0;
10206 no_init_flag = automatic_flag = is_non_constant_shape_array (sym);
10207 sym->as->corank = corank;
10209 if (automatic_flag && sym->attr.save == SAVE_EXPLICIT)
10211 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10216 /* Ensure that any initializer is simplified. */
10218 gfc_simplify_expr (sym->value, 1);
10220 /* Reject illegal initializers. */
10221 if (!sym->mark && sym->value)
10223 if (sym->attr.allocatable || (sym->ts.type == BT_CLASS
10224 && CLASS_DATA (sym)->attr.allocatable))
10225 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
10226 sym->name, &sym->declared_at);
10227 else if (sym->attr.external)
10228 gfc_error ("External '%s' at %L cannot have an initializer",
10229 sym->name, &sym->declared_at);
10230 else if (sym->attr.dummy
10231 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
10232 gfc_error ("Dummy '%s' at %L cannot have an initializer",
10233 sym->name, &sym->declared_at);
10234 else if (sym->attr.intrinsic)
10235 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
10236 sym->name, &sym->declared_at);
10237 else if (sym->attr.result)
10238 gfc_error ("Function result '%s' at %L cannot have an initializer",
10239 sym->name, &sym->declared_at);
10240 else if (automatic_flag)
10241 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
10242 sym->name, &sym->declared_at);
10244 goto no_init_error;
10249 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
10250 return resolve_fl_variable_derived (sym, no_init_flag);
10256 /* Resolve a procedure. */
10259 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
10261 gfc_formal_arglist *arg;
10263 if (sym->attr.function
10264 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10267 if (sym->ts.type == BT_CHARACTER)
10269 gfc_charlen *cl = sym->ts.u.cl;
10271 if (cl && cl->length && gfc_is_constant_expr (cl->length)
10272 && resolve_charlen (cl) == FAILURE)
10275 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10276 && sym->attr.proc == PROC_ST_FUNCTION)
10278 gfc_error ("Character-valued statement function '%s' at %L must "
10279 "have constant length", sym->name, &sym->declared_at);
10284 /* Ensure that derived type for are not of a private type. Internal
10285 module procedures are excluded by 2.2.3.3 - i.e., they are not
10286 externally accessible and can access all the objects accessible in
10288 if (!(sym->ns->parent
10289 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
10290 && gfc_check_symbol_access (sym))
10292 gfc_interface *iface;
10294 for (arg = sym->formal; arg; arg = arg->next)
10297 && arg->sym->ts.type == BT_DERIVED
10298 && !arg->sym->ts.u.derived->attr.use_assoc
10299 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10300 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
10301 "PRIVATE type and cannot be a dummy argument"
10302 " of '%s', which is PUBLIC at %L",
10303 arg->sym->name, sym->name, &sym->declared_at)
10306 /* Stop this message from recurring. */
10307 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10312 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10313 PRIVATE to the containing module. */
10314 for (iface = sym->generic; iface; iface = iface->next)
10316 for (arg = iface->sym->formal; arg; arg = arg->next)
10319 && arg->sym->ts.type == BT_DERIVED
10320 && !arg->sym->ts.u.derived->attr.use_assoc
10321 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10322 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10323 "'%s' in PUBLIC interface '%s' at %L "
10324 "takes dummy arguments of '%s' which is "
10325 "PRIVATE", iface->sym->name, sym->name,
10326 &iface->sym->declared_at,
10327 gfc_typename (&arg->sym->ts)) == FAILURE)
10329 /* Stop this message from recurring. */
10330 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10336 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10337 PRIVATE to the containing module. */
10338 for (iface = sym->generic; iface; iface = iface->next)
10340 for (arg = iface->sym->formal; arg; arg = arg->next)
10343 && arg->sym->ts.type == BT_DERIVED
10344 && !arg->sym->ts.u.derived->attr.use_assoc
10345 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10346 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10347 "'%s' in PUBLIC interface '%s' at %L "
10348 "takes dummy arguments of '%s' which is "
10349 "PRIVATE", iface->sym->name, sym->name,
10350 &iface->sym->declared_at,
10351 gfc_typename (&arg->sym->ts)) == FAILURE)
10353 /* Stop this message from recurring. */
10354 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10361 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
10362 && !sym->attr.proc_pointer)
10364 gfc_error ("Function '%s' at %L cannot have an initializer",
10365 sym->name, &sym->declared_at);
10369 /* An external symbol may not have an initializer because it is taken to be
10370 a procedure. Exception: Procedure Pointers. */
10371 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
10373 gfc_error ("External object '%s' at %L may not have an initializer",
10374 sym->name, &sym->declared_at);
10378 /* An elemental function is required to return a scalar 12.7.1 */
10379 if (sym->attr.elemental && sym->attr.function && sym->as)
10381 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
10382 "result", sym->name, &sym->declared_at);
10383 /* Reset so that the error only occurs once. */
10384 sym->attr.elemental = 0;
10388 if (sym->attr.proc == PROC_ST_FUNCTION
10389 && (sym->attr.allocatable || sym->attr.pointer))
10391 gfc_error ("Statement function '%s' at %L may not have pointer or "
10392 "allocatable attribute", sym->name, &sym->declared_at);
10396 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
10397 char-len-param shall not be array-valued, pointer-valued, recursive
10398 or pure. ....snip... A character value of * may only be used in the
10399 following ways: (i) Dummy arg of procedure - dummy associates with
10400 actual length; (ii) To declare a named constant; or (iii) External
10401 function - but length must be declared in calling scoping unit. */
10402 if (sym->attr.function
10403 && sym->ts.type == BT_CHARACTER
10404 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
10406 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
10407 || (sym->attr.recursive) || (sym->attr.pure))
10409 if (sym->as && sym->as->rank)
10410 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10411 "array-valued", sym->name, &sym->declared_at);
10413 if (sym->attr.pointer)
10414 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10415 "pointer-valued", sym->name, &sym->declared_at);
10417 if (sym->attr.pure)
10418 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10419 "pure", sym->name, &sym->declared_at);
10421 if (sym->attr.recursive)
10422 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10423 "recursive", sym->name, &sym->declared_at);
10428 /* Appendix B.2 of the standard. Contained functions give an
10429 error anyway. Fixed-form is likely to be F77/legacy. Deferred
10430 character length is an F2003 feature. */
10431 if (!sym->attr.contained
10432 && gfc_current_form != FORM_FIXED
10433 && !sym->ts.deferred)
10434 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
10435 "CHARACTER(*) function '%s' at %L",
10436 sym->name, &sym->declared_at);
10439 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
10441 gfc_formal_arglist *curr_arg;
10442 int has_non_interop_arg = 0;
10444 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10445 sym->common_block) == FAILURE)
10447 /* Clear these to prevent looking at them again if there was an
10449 sym->attr.is_bind_c = 0;
10450 sym->attr.is_c_interop = 0;
10451 sym->ts.is_c_interop = 0;
10455 /* So far, no errors have been found. */
10456 sym->attr.is_c_interop = 1;
10457 sym->ts.is_c_interop = 1;
10460 curr_arg = sym->formal;
10461 while (curr_arg != NULL)
10463 /* Skip implicitly typed dummy args here. */
10464 if (curr_arg->sym->attr.implicit_type == 0)
10465 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
10466 /* If something is found to fail, record the fact so we
10467 can mark the symbol for the procedure as not being
10468 BIND(C) to try and prevent multiple errors being
10470 has_non_interop_arg = 1;
10472 curr_arg = curr_arg->next;
10475 /* See if any of the arguments were not interoperable and if so, clear
10476 the procedure symbol to prevent duplicate error messages. */
10477 if (has_non_interop_arg != 0)
10479 sym->attr.is_c_interop = 0;
10480 sym->ts.is_c_interop = 0;
10481 sym->attr.is_bind_c = 0;
10485 if (!sym->attr.proc_pointer)
10487 if (sym->attr.save == SAVE_EXPLICIT)
10489 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
10490 "in '%s' at %L", sym->name, &sym->declared_at);
10493 if (sym->attr.intent)
10495 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
10496 "in '%s' at %L", sym->name, &sym->declared_at);
10499 if (sym->attr.subroutine && sym->attr.result)
10501 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
10502 "in '%s' at %L", sym->name, &sym->declared_at);
10505 if (sym->attr.external && sym->attr.function
10506 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
10507 || sym->attr.contained))
10509 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
10510 "in '%s' at %L", sym->name, &sym->declared_at);
10513 if (strcmp ("ppr@", sym->name) == 0)
10515 gfc_error ("Procedure pointer result '%s' at %L "
10516 "is missing the pointer attribute",
10517 sym->ns->proc_name->name, &sym->declared_at);
10526 /* Resolve a list of finalizer procedures. That is, after they have hopefully
10527 been defined and we now know their defined arguments, check that they fulfill
10528 the requirements of the standard for procedures used as finalizers. */
10531 gfc_resolve_finalizers (gfc_symbol* derived)
10533 gfc_finalizer* list;
10534 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
10535 gfc_try result = SUCCESS;
10536 bool seen_scalar = false;
10538 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
10541 /* Walk over the list of finalizer-procedures, check them, and if any one
10542 does not fit in with the standard's definition, print an error and remove
10543 it from the list. */
10544 prev_link = &derived->f2k_derived->finalizers;
10545 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
10551 /* Skip this finalizer if we already resolved it. */
10552 if (list->proc_tree)
10554 prev_link = &(list->next);
10558 /* Check this exists and is a SUBROUTINE. */
10559 if (!list->proc_sym->attr.subroutine)
10561 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
10562 list->proc_sym->name, &list->where);
10566 /* We should have exactly one argument. */
10567 if (!list->proc_sym->formal || list->proc_sym->formal->next)
10569 gfc_error ("FINAL procedure at %L must have exactly one argument",
10573 arg = list->proc_sym->formal->sym;
10575 /* This argument must be of our type. */
10576 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
10578 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
10579 &arg->declared_at, derived->name);
10583 /* It must neither be a pointer nor allocatable nor optional. */
10584 if (arg->attr.pointer)
10586 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
10587 &arg->declared_at);
10590 if (arg->attr.allocatable)
10592 gfc_error ("Argument of FINAL procedure at %L must not be"
10593 " ALLOCATABLE", &arg->declared_at);
10596 if (arg->attr.optional)
10598 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
10599 &arg->declared_at);
10603 /* It must not be INTENT(OUT). */
10604 if (arg->attr.intent == INTENT_OUT)
10606 gfc_error ("Argument of FINAL procedure at %L must not be"
10607 " INTENT(OUT)", &arg->declared_at);
10611 /* Warn if the procedure is non-scalar and not assumed shape. */
10612 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
10613 && arg->as->type != AS_ASSUMED_SHAPE)
10614 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
10615 " shape argument", &arg->declared_at);
10617 /* Check that it does not match in kind and rank with a FINAL procedure
10618 defined earlier. To really loop over the *earlier* declarations,
10619 we need to walk the tail of the list as new ones were pushed at the
10621 /* TODO: Handle kind parameters once they are implemented. */
10622 my_rank = (arg->as ? arg->as->rank : 0);
10623 for (i = list->next; i; i = i->next)
10625 /* Argument list might be empty; that is an error signalled earlier,
10626 but we nevertheless continued resolving. */
10627 if (i->proc_sym->formal)
10629 gfc_symbol* i_arg = i->proc_sym->formal->sym;
10630 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
10631 if (i_rank == my_rank)
10633 gfc_error ("FINAL procedure '%s' declared at %L has the same"
10634 " rank (%d) as '%s'",
10635 list->proc_sym->name, &list->where, my_rank,
10636 i->proc_sym->name);
10642 /* Is this the/a scalar finalizer procedure? */
10643 if (!arg->as || arg->as->rank == 0)
10644 seen_scalar = true;
10646 /* Find the symtree for this procedure. */
10647 gcc_assert (!list->proc_tree);
10648 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
10650 prev_link = &list->next;
10653 /* Remove wrong nodes immediately from the list so we don't risk any
10654 troubles in the future when they might fail later expectations. */
10658 *prev_link = list->next;
10659 gfc_free_finalizer (i);
10662 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
10663 were nodes in the list, must have been for arrays. It is surely a good
10664 idea to have a scalar version there if there's something to finalize. */
10665 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
10666 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
10667 " defined at %L, suggest also scalar one",
10668 derived->name, &derived->declared_at);
10670 /* TODO: Remove this error when finalization is finished. */
10671 gfc_error ("Finalization at %L is not yet implemented",
10672 &derived->declared_at);
10678 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10681 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10682 const char* generic_name, locus where)
10687 gcc_assert (t1->specific && t2->specific);
10688 gcc_assert (!t1->specific->is_generic);
10689 gcc_assert (!t2->specific->is_generic);
10691 sym1 = t1->specific->u.specific->n.sym;
10692 sym2 = t2->specific->u.specific->n.sym;
10697 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10698 if (sym1->attr.subroutine != sym2->attr.subroutine
10699 || sym1->attr.function != sym2->attr.function)
10701 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10702 " GENERIC '%s' at %L",
10703 sym1->name, sym2->name, generic_name, &where);
10707 /* Compare the interfaces. */
10708 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10710 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10711 sym1->name, sym2->name, generic_name, &where);
10719 /* Worker function for resolving a generic procedure binding; this is used to
10720 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10722 The difference between those cases is finding possible inherited bindings
10723 that are overridden, as one has to look for them in tb_sym_root,
10724 tb_uop_root or tb_op, respectively. Thus the caller must already find
10725 the super-type and set p->overridden correctly. */
10728 resolve_tb_generic_targets (gfc_symbol* super_type,
10729 gfc_typebound_proc* p, const char* name)
10731 gfc_tbp_generic* target;
10732 gfc_symtree* first_target;
10733 gfc_symtree* inherited;
10735 gcc_assert (p && p->is_generic);
10737 /* Try to find the specific bindings for the symtrees in our target-list. */
10738 gcc_assert (p->u.generic);
10739 for (target = p->u.generic; target; target = target->next)
10740 if (!target->specific)
10742 gfc_typebound_proc* overridden_tbp;
10743 gfc_tbp_generic* g;
10744 const char* target_name;
10746 target_name = target->specific_st->name;
10748 /* Defined for this type directly. */
10749 if (target->specific_st->n.tb && !target->specific_st->n.tb->error)
10751 target->specific = target->specific_st->n.tb;
10752 goto specific_found;
10755 /* Look for an inherited specific binding. */
10758 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10763 gcc_assert (inherited->n.tb);
10764 target->specific = inherited->n.tb;
10765 goto specific_found;
10769 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10770 " at %L", target_name, name, &p->where);
10773 /* Once we've found the specific binding, check it is not ambiguous with
10774 other specifics already found or inherited for the same GENERIC. */
10776 gcc_assert (target->specific);
10778 /* This must really be a specific binding! */
10779 if (target->specific->is_generic)
10781 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10782 " '%s' is GENERIC, too", name, &p->where, target_name);
10786 /* Check those already resolved on this type directly. */
10787 for (g = p->u.generic; g; g = g->next)
10788 if (g != target && g->specific
10789 && check_generic_tbp_ambiguity (target, g, name, p->where)
10793 /* Check for ambiguity with inherited specific targets. */
10794 for (overridden_tbp = p->overridden; overridden_tbp;
10795 overridden_tbp = overridden_tbp->overridden)
10796 if (overridden_tbp->is_generic)
10798 for (g = overridden_tbp->u.generic; g; g = g->next)
10800 gcc_assert (g->specific);
10801 if (check_generic_tbp_ambiguity (target, g,
10802 name, p->where) == FAILURE)
10808 /* If we attempt to "overwrite" a specific binding, this is an error. */
10809 if (p->overridden && !p->overridden->is_generic)
10811 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10812 " the same name", name, &p->where);
10816 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10817 all must have the same attributes here. */
10818 first_target = p->u.generic->specific->u.specific;
10819 gcc_assert (first_target);
10820 p->subroutine = first_target->n.sym->attr.subroutine;
10821 p->function = first_target->n.sym->attr.function;
10827 /* Resolve a GENERIC procedure binding for a derived type. */
10830 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10832 gfc_symbol* super_type;
10834 /* Find the overridden binding if any. */
10835 st->n.tb->overridden = NULL;
10836 super_type = gfc_get_derived_super_type (derived);
10839 gfc_symtree* overridden;
10840 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10843 if (overridden && overridden->n.tb)
10844 st->n.tb->overridden = overridden->n.tb;
10847 /* Resolve using worker function. */
10848 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10852 /* Retrieve the target-procedure of an operator binding and do some checks in
10853 common for intrinsic and user-defined type-bound operators. */
10856 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10858 gfc_symbol* target_proc;
10860 gcc_assert (target->specific && !target->specific->is_generic);
10861 target_proc = target->specific->u.specific->n.sym;
10862 gcc_assert (target_proc);
10864 /* All operator bindings must have a passed-object dummy argument. */
10865 if (target->specific->nopass)
10867 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10871 return target_proc;
10875 /* Resolve a type-bound intrinsic operator. */
10878 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10879 gfc_typebound_proc* p)
10881 gfc_symbol* super_type;
10882 gfc_tbp_generic* target;
10884 /* If there's already an error here, do nothing (but don't fail again). */
10888 /* Operators should always be GENERIC bindings. */
10889 gcc_assert (p->is_generic);
10891 /* Look for an overridden binding. */
10892 super_type = gfc_get_derived_super_type (derived);
10893 if (super_type && super_type->f2k_derived)
10894 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10897 p->overridden = NULL;
10899 /* Resolve general GENERIC properties using worker function. */
10900 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10903 /* Check the targets to be procedures of correct interface. */
10904 for (target = p->u.generic; target; target = target->next)
10906 gfc_symbol* target_proc;
10908 target_proc = get_checked_tb_operator_target (target, p->where);
10912 if (!gfc_check_operator_interface (target_proc, op, p->where))
10924 /* Resolve a type-bound user operator (tree-walker callback). */
10926 static gfc_symbol* resolve_bindings_derived;
10927 static gfc_try resolve_bindings_result;
10929 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10932 resolve_typebound_user_op (gfc_symtree* stree)
10934 gfc_symbol* super_type;
10935 gfc_tbp_generic* target;
10937 gcc_assert (stree && stree->n.tb);
10939 if (stree->n.tb->error)
10942 /* Operators should always be GENERIC bindings. */
10943 gcc_assert (stree->n.tb->is_generic);
10945 /* Find overridden procedure, if any. */
10946 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10947 if (super_type && super_type->f2k_derived)
10949 gfc_symtree* overridden;
10950 overridden = gfc_find_typebound_user_op (super_type, NULL,
10951 stree->name, true, NULL);
10953 if (overridden && overridden->n.tb)
10954 stree->n.tb->overridden = overridden->n.tb;
10957 stree->n.tb->overridden = NULL;
10959 /* Resolve basically using worker function. */
10960 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10964 /* Check the targets to be functions of correct interface. */
10965 for (target = stree->n.tb->u.generic; target; target = target->next)
10967 gfc_symbol* target_proc;
10969 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10973 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10980 resolve_bindings_result = FAILURE;
10981 stree->n.tb->error = 1;
10985 /* Resolve the type-bound procedures for a derived type. */
10988 resolve_typebound_procedure (gfc_symtree* stree)
10992 gfc_symbol* me_arg;
10993 gfc_symbol* super_type;
10994 gfc_component* comp;
10996 gcc_assert (stree);
10998 /* Undefined specific symbol from GENERIC target definition. */
11002 if (stree->n.tb->error)
11005 /* If this is a GENERIC binding, use that routine. */
11006 if (stree->n.tb->is_generic)
11008 if (resolve_typebound_generic (resolve_bindings_derived, stree)
11014 /* Get the target-procedure to check it. */
11015 gcc_assert (!stree->n.tb->is_generic);
11016 gcc_assert (stree->n.tb->u.specific);
11017 proc = stree->n.tb->u.specific->n.sym;
11018 where = stree->n.tb->where;
11020 /* Default access should already be resolved from the parser. */
11021 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
11023 /* It should be a module procedure or an external procedure with explicit
11024 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
11025 if ((!proc->attr.subroutine && !proc->attr.function)
11026 || (proc->attr.proc != PROC_MODULE
11027 && proc->attr.if_source != IFSRC_IFBODY)
11028 || (proc->attr.abstract && !stree->n.tb->deferred))
11030 gfc_error ("'%s' must be a module procedure or an external procedure with"
11031 " an explicit interface at %L", proc->name, &where);
11034 stree->n.tb->subroutine = proc->attr.subroutine;
11035 stree->n.tb->function = proc->attr.function;
11037 /* Find the super-type of the current derived type. We could do this once and
11038 store in a global if speed is needed, but as long as not I believe this is
11039 more readable and clearer. */
11040 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11042 /* If PASS, resolve and check arguments if not already resolved / loaded
11043 from a .mod file. */
11044 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
11046 if (stree->n.tb->pass_arg)
11048 gfc_formal_arglist* i;
11050 /* If an explicit passing argument name is given, walk the arg-list
11051 and look for it. */
11054 stree->n.tb->pass_arg_num = 1;
11055 for (i = proc->formal; i; i = i->next)
11057 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
11062 ++stree->n.tb->pass_arg_num;
11067 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
11069 proc->name, stree->n.tb->pass_arg, &where,
11070 stree->n.tb->pass_arg);
11076 /* Otherwise, take the first one; there should in fact be at least
11078 stree->n.tb->pass_arg_num = 1;
11081 gfc_error ("Procedure '%s' with PASS at %L must have at"
11082 " least one argument", proc->name, &where);
11085 me_arg = proc->formal->sym;
11088 /* Now check that the argument-type matches and the passed-object
11089 dummy argument is generally fine. */
11091 gcc_assert (me_arg);
11093 if (me_arg->ts.type != BT_CLASS)
11095 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11096 " at %L", proc->name, &where);
11100 if (CLASS_DATA (me_arg)->ts.u.derived
11101 != resolve_bindings_derived)
11103 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11104 " the derived-type '%s'", me_arg->name, proc->name,
11105 me_arg->name, &where, resolve_bindings_derived->name);
11109 gcc_assert (me_arg->ts.type == BT_CLASS);
11110 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
11112 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
11113 " scalar", proc->name, &where);
11116 if (CLASS_DATA (me_arg)->attr.allocatable)
11118 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11119 " be ALLOCATABLE", proc->name, &where);
11122 if (CLASS_DATA (me_arg)->attr.class_pointer)
11124 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11125 " be POINTER", proc->name, &where);
11130 /* If we are extending some type, check that we don't override a procedure
11131 flagged NON_OVERRIDABLE. */
11132 stree->n.tb->overridden = NULL;
11135 gfc_symtree* overridden;
11136 overridden = gfc_find_typebound_proc (super_type, NULL,
11137 stree->name, true, NULL);
11141 if (overridden->n.tb)
11142 stree->n.tb->overridden = overridden->n.tb;
11144 if (gfc_check_typebound_override (stree, overridden) == FAILURE)
11149 /* See if there's a name collision with a component directly in this type. */
11150 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
11151 if (!strcmp (comp->name, stree->name))
11153 gfc_error ("Procedure '%s' at %L has the same name as a component of"
11155 stree->name, &where, resolve_bindings_derived->name);
11159 /* Try to find a name collision with an inherited component. */
11160 if (super_type && gfc_find_component (super_type, stree->name, true, true))
11162 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
11163 " component of '%s'",
11164 stree->name, &where, resolve_bindings_derived->name);
11168 stree->n.tb->error = 0;
11172 resolve_bindings_result = FAILURE;
11173 stree->n.tb->error = 1;
11178 resolve_typebound_procedures (gfc_symbol* derived)
11181 gfc_symbol* super_type;
11183 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
11186 super_type = gfc_get_derived_super_type (derived);
11188 resolve_typebound_procedures (super_type);
11190 resolve_bindings_derived = derived;
11191 resolve_bindings_result = SUCCESS;
11193 /* Make sure the vtab has been generated. */
11194 gfc_find_derived_vtab (derived);
11196 if (derived->f2k_derived->tb_sym_root)
11197 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
11198 &resolve_typebound_procedure);
11200 if (derived->f2k_derived->tb_uop_root)
11201 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
11202 &resolve_typebound_user_op);
11204 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
11206 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
11207 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
11209 resolve_bindings_result = FAILURE;
11212 return resolve_bindings_result;
11216 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
11217 to give all identical derived types the same backend_decl. */
11219 add_dt_to_dt_list (gfc_symbol *derived)
11221 gfc_dt_list *dt_list;
11223 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
11224 if (derived == dt_list->derived)
11227 dt_list = gfc_get_dt_list ();
11228 dt_list->next = gfc_derived_types;
11229 dt_list->derived = derived;
11230 gfc_derived_types = dt_list;
11234 /* Ensure that a derived-type is really not abstract, meaning that every
11235 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
11238 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
11243 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
11245 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
11248 if (st->n.tb && st->n.tb->deferred)
11250 gfc_symtree* overriding;
11251 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
11254 gcc_assert (overriding->n.tb);
11255 if (overriding->n.tb->deferred)
11257 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
11258 " '%s' is DEFERRED and not overridden",
11259 sub->name, &sub->declared_at, st->name);
11268 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
11270 /* The algorithm used here is to recursively travel up the ancestry of sub
11271 and for each ancestor-type, check all bindings. If any of them is
11272 DEFERRED, look it up starting from sub and see if the found (overriding)
11273 binding is not DEFERRED.
11274 This is not the most efficient way to do this, but it should be ok and is
11275 clearer than something sophisticated. */
11277 gcc_assert (ancestor && !sub->attr.abstract);
11279 if (!ancestor->attr.abstract)
11282 /* Walk bindings of this ancestor. */
11283 if (ancestor->f2k_derived)
11286 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
11291 /* Find next ancestor type and recurse on it. */
11292 ancestor = gfc_get_derived_super_type (ancestor);
11294 return ensure_not_abstract (sub, ancestor);
11300 /* Resolve the components of a derived type. This does not have to wait until
11301 resolution stage, but can be done as soon as the dt declaration has been
11305 resolve_fl_derived0 (gfc_symbol *sym)
11307 gfc_symbol* super_type;
11310 super_type = gfc_get_derived_super_type (sym);
11313 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
11315 gfc_error ("As extending type '%s' at %L has a coarray component, "
11316 "parent type '%s' shall also have one", sym->name,
11317 &sym->declared_at, super_type->name);
11321 /* Ensure the extended type gets resolved before we do. */
11322 if (super_type && resolve_fl_derived0 (super_type) == FAILURE)
11325 /* An ABSTRACT type must be extensible. */
11326 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
11328 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
11329 sym->name, &sym->declared_at);
11333 for (c = sym->components; c != NULL; c = c->next)
11336 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
11337 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
11339 gfc_error ("Coarray component '%s' at %L must be allocatable with "
11340 "deferred shape", c->name, &c->loc);
11345 if (c->attr.codimension && c->ts.type == BT_DERIVED
11346 && c->ts.u.derived->ts.is_iso_c)
11348 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11349 "shall not be a coarray", c->name, &c->loc);
11354 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
11355 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
11356 || c->attr.allocatable))
11358 gfc_error ("Component '%s' at %L with coarray component "
11359 "shall be a nonpointer, nonallocatable scalar",
11365 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
11367 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
11368 "is not an array pointer", c->name, &c->loc);
11372 if (c->attr.proc_pointer && c->ts.interface)
11374 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
11375 gfc_error ("Interface '%s', used by procedure pointer component "
11376 "'%s' at %L, is declared in a later PROCEDURE statement",
11377 c->ts.interface->name, c->name, &c->loc);
11379 /* Get the attributes from the interface (now resolved). */
11380 if (c->ts.interface->attr.if_source
11381 || c->ts.interface->attr.intrinsic)
11383 gfc_symbol *ifc = c->ts.interface;
11385 if (ifc->formal && !ifc->formal_ns)
11386 resolve_symbol (ifc);
11388 if (ifc->attr.intrinsic)
11389 resolve_intrinsic (ifc, &ifc->declared_at);
11393 c->ts = ifc->result->ts;
11394 c->attr.allocatable = ifc->result->attr.allocatable;
11395 c->attr.pointer = ifc->result->attr.pointer;
11396 c->attr.dimension = ifc->result->attr.dimension;
11397 c->as = gfc_copy_array_spec (ifc->result->as);
11402 c->attr.allocatable = ifc->attr.allocatable;
11403 c->attr.pointer = ifc->attr.pointer;
11404 c->attr.dimension = ifc->attr.dimension;
11405 c->as = gfc_copy_array_spec (ifc->as);
11407 c->ts.interface = ifc;
11408 c->attr.function = ifc->attr.function;
11409 c->attr.subroutine = ifc->attr.subroutine;
11410 gfc_copy_formal_args_ppc (c, ifc);
11412 c->attr.pure = ifc->attr.pure;
11413 c->attr.elemental = ifc->attr.elemental;
11414 c->attr.recursive = ifc->attr.recursive;
11415 c->attr.always_explicit = ifc->attr.always_explicit;
11416 c->attr.ext_attr |= ifc->attr.ext_attr;
11417 /* Replace symbols in array spec. */
11421 for (i = 0; i < c->as->rank; i++)
11423 gfc_expr_replace_comp (c->as->lower[i], c);
11424 gfc_expr_replace_comp (c->as->upper[i], c);
11427 /* Copy char length. */
11428 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11430 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11431 gfc_expr_replace_comp (cl->length, c);
11432 if (cl->length && !cl->resolved
11433 && gfc_resolve_expr (cl->length) == FAILURE)
11438 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
11440 gfc_error ("Interface '%s' of procedure pointer component "
11441 "'%s' at %L must be explicit", c->ts.interface->name,
11446 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
11448 /* Since PPCs are not implicitly typed, a PPC without an explicit
11449 interface must be a subroutine. */
11450 gfc_add_subroutine (&c->attr, c->name, &c->loc);
11453 /* Procedure pointer components: Check PASS arg. */
11454 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
11455 && !sym->attr.vtype)
11457 gfc_symbol* me_arg;
11459 if (c->tb->pass_arg)
11461 gfc_formal_arglist* i;
11463 /* If an explicit passing argument name is given, walk the arg-list
11464 and look for it. */
11467 c->tb->pass_arg_num = 1;
11468 for (i = c->formal; i; i = i->next)
11470 if (!strcmp (i->sym->name, c->tb->pass_arg))
11475 c->tb->pass_arg_num++;
11480 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11481 "at %L has no argument '%s'", c->name,
11482 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11489 /* Otherwise, take the first one; there should in fact be at least
11491 c->tb->pass_arg_num = 1;
11494 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11495 "must have at least one argument",
11500 me_arg = c->formal->sym;
11503 /* Now check that the argument-type matches. */
11504 gcc_assert (me_arg);
11505 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11506 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11507 || (me_arg->ts.type == BT_CLASS
11508 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11510 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11511 " the derived type '%s'", me_arg->name, c->name,
11512 me_arg->name, &c->loc, sym->name);
11517 /* Check for C453. */
11518 if (me_arg->attr.dimension)
11520 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11521 "must be scalar", me_arg->name, c->name, me_arg->name,
11527 if (me_arg->attr.pointer)
11529 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11530 "may not have the POINTER attribute", me_arg->name,
11531 c->name, me_arg->name, &c->loc);
11536 if (me_arg->attr.allocatable)
11538 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11539 "may not be ALLOCATABLE", me_arg->name, c->name,
11540 me_arg->name, &c->loc);
11545 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11546 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11547 " at %L", c->name, &c->loc);
11551 /* Check type-spec if this is not the parent-type component. */
11552 if ((!sym->attr.extension || c != sym->components) && !sym->attr.vtype
11553 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11556 /* If this type is an extension, set the accessibility of the parent
11558 if (super_type && c == sym->components
11559 && strcmp (super_type->name, c->name) == 0)
11560 c->attr.access = super_type->attr.access;
11562 /* If this type is an extension, see if this component has the same name
11563 as an inherited type-bound procedure. */
11564 if (super_type && !sym->attr.is_class
11565 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11567 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11568 " inherited type-bound procedure",
11569 c->name, sym->name, &c->loc);
11573 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer
11574 && !c->ts.deferred)
11576 if (c->ts.u.cl->length == NULL
11577 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11578 || !gfc_is_constant_expr (c->ts.u.cl->length))
11580 gfc_error ("Character length of component '%s' needs to "
11581 "be a constant specification expression at %L",
11583 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11588 if (c->ts.type == BT_CHARACTER && c->ts.deferred
11589 && !c->attr.pointer && !c->attr.allocatable)
11591 gfc_error ("Character component '%s' of '%s' at %L with deferred "
11592 "length must be a POINTER or ALLOCATABLE",
11593 c->name, sym->name, &c->loc);
11597 if (c->ts.type == BT_DERIVED
11598 && sym->component_access != ACCESS_PRIVATE
11599 && gfc_check_symbol_access (sym)
11600 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11601 && !c->ts.u.derived->attr.use_assoc
11602 && !gfc_check_symbol_access (c->ts.u.derived)
11603 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11604 "is a PRIVATE type and cannot be a component of "
11605 "'%s', which is PUBLIC at %L", c->name,
11606 sym->name, &sym->declared_at) == FAILURE)
11609 if ((sym->attr.sequence || sym->attr.is_bind_c) && c->ts.type == BT_CLASS)
11611 gfc_error ("Polymorphic component %s at %L in SEQUENCE or BIND(C) "
11612 "type %s", c->name, &c->loc, sym->name);
11616 if (sym->attr.sequence)
11618 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11620 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11621 "not have the SEQUENCE attribute",
11622 c->ts.u.derived->name, &sym->declared_at);
11627 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && !sym->attr.vtype
11628 && c->attr.pointer && c->ts.u.derived->components == NULL
11629 && !c->ts.u.derived->attr.zero_comp)
11631 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11632 "that has not been declared", c->name, sym->name,
11637 if (c->ts.type == BT_CLASS && c->attr.class_ok
11638 && CLASS_DATA (c)->attr.class_pointer
11639 && CLASS_DATA (c)->ts.u.derived->components == NULL
11640 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11642 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11643 "that has not been declared", c->name, sym->name,
11649 if (c->ts.type == BT_CLASS && c->attr.flavor != FL_PROCEDURE
11650 && (!c->attr.class_ok
11651 || !(CLASS_DATA (c)->attr.class_pointer
11652 || CLASS_DATA (c)->attr.allocatable)))
11654 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11655 "or pointer", c->name, &c->loc);
11659 /* Ensure that all the derived type components are put on the
11660 derived type list; even in formal namespaces, where derived type
11661 pointer components might not have been declared. */
11662 if (c->ts.type == BT_DERIVED
11664 && c->ts.u.derived->components
11666 && sym != c->ts.u.derived)
11667 add_dt_to_dt_list (c->ts.u.derived);
11669 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11670 || c->attr.proc_pointer
11671 || c->attr.allocatable)) == FAILURE)
11675 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11676 all DEFERRED bindings are overridden. */
11677 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11678 && !sym->attr.is_class
11679 && ensure_not_abstract (sym, super_type) == FAILURE)
11682 /* Add derived type to the derived type list. */
11683 add_dt_to_dt_list (sym);
11689 /* The following procedure does the full resolution of a derived type,
11690 including resolution of all type-bound procedures (if present). In contrast
11691 to 'resolve_fl_derived0' this can only be done after the module has been
11692 parsed completely. */
11695 resolve_fl_derived (gfc_symbol *sym)
11697 if (sym->attr.is_class && sym->ts.u.derived == NULL)
11699 /* Fix up incomplete CLASS symbols. */
11700 gfc_component *data = gfc_find_component (sym, "_data", true, true);
11701 gfc_component *vptr = gfc_find_component (sym, "_vptr", true, true);
11702 if (vptr->ts.u.derived == NULL)
11704 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
11706 vptr->ts.u.derived = vtab->ts.u.derived;
11710 if (resolve_fl_derived0 (sym) == FAILURE)
11713 /* Resolve the type-bound procedures. */
11714 if (resolve_typebound_procedures (sym) == FAILURE)
11717 /* Resolve the finalizer procedures. */
11718 if (gfc_resolve_finalizers (sym) == FAILURE)
11726 resolve_fl_namelist (gfc_symbol *sym)
11731 for (nl = sym->namelist; nl; nl = nl->next)
11733 /* Check again, the check in match only works if NAMELIST comes
11735 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SIZE)
11737 gfc_error ("Assumed size array '%s' in namelist '%s' at %L is not "
11738 "allowed", nl->sym->name, sym->name, &sym->declared_at);
11742 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11743 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11744 "object '%s' with assumed shape in namelist "
11745 "'%s' at %L", nl->sym->name, sym->name,
11746 &sym->declared_at) == FAILURE)
11749 if (is_non_constant_shape_array (nl->sym)
11750 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11751 "object '%s' with nonconstant shape in namelist "
11752 "'%s' at %L", nl->sym->name, sym->name,
11753 &sym->declared_at) == FAILURE)
11756 if (nl->sym->ts.type == BT_CHARACTER
11757 && (nl->sym->ts.u.cl->length == NULL
11758 || !gfc_is_constant_expr (nl->sym->ts.u.cl->length))
11759 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11760 "'%s' with nonconstant character length in "
11761 "namelist '%s' at %L", nl->sym->name, sym->name,
11762 &sym->declared_at) == FAILURE)
11765 /* FIXME: Once UDDTIO is implemented, the following can be
11767 if (nl->sym->ts.type == BT_CLASS)
11769 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L is "
11770 "polymorphic and requires a defined input/output "
11771 "procedure", nl->sym->name, sym->name, &sym->declared_at);
11775 if (nl->sym->ts.type == BT_DERIVED
11776 && (nl->sym->ts.u.derived->attr.alloc_comp
11777 || nl->sym->ts.u.derived->attr.pointer_comp))
11779 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11780 "'%s' in namelist '%s' at %L with ALLOCATABLE "
11781 "or POINTER components", nl->sym->name,
11782 sym->name, &sym->declared_at) == FAILURE)
11785 /* FIXME: Once UDDTIO is implemented, the following can be
11787 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L has "
11788 "ALLOCATABLE or POINTER components and thus requires "
11789 "a defined input/output procedure", nl->sym->name,
11790 sym->name, &sym->declared_at);
11795 /* Reject PRIVATE objects in a PUBLIC namelist. */
11796 if (gfc_check_symbol_access (sym))
11798 for (nl = sym->namelist; nl; nl = nl->next)
11800 if (!nl->sym->attr.use_assoc
11801 && !is_sym_host_assoc (nl->sym, sym->ns)
11802 && !gfc_check_symbol_access (nl->sym))
11804 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11805 "cannot be member of PUBLIC namelist '%s' at %L",
11806 nl->sym->name, sym->name, &sym->declared_at);
11810 /* Types with private components that came here by USE-association. */
11811 if (nl->sym->ts.type == BT_DERIVED
11812 && derived_inaccessible (nl->sym->ts.u.derived))
11814 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11815 "components and cannot be member of namelist '%s' at %L",
11816 nl->sym->name, sym->name, &sym->declared_at);
11820 /* Types with private components that are defined in the same module. */
11821 if (nl->sym->ts.type == BT_DERIVED
11822 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11823 && nl->sym->ts.u.derived->attr.private_comp)
11825 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11826 "cannot be a member of PUBLIC namelist '%s' at %L",
11827 nl->sym->name, sym->name, &sym->declared_at);
11834 /* 14.1.2 A module or internal procedure represent local entities
11835 of the same type as a namelist member and so are not allowed. */
11836 for (nl = sym->namelist; nl; nl = nl->next)
11838 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11841 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11842 if ((nl->sym == sym->ns->proc_name)
11844 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11848 if (nl->sym && nl->sym->name)
11849 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11850 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11852 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11853 "attribute in '%s' at %L", nlsym->name,
11854 &sym->declared_at);
11864 resolve_fl_parameter (gfc_symbol *sym)
11866 /* A parameter array's shape needs to be constant. */
11867 if (sym->as != NULL
11868 && (sym->as->type == AS_DEFERRED
11869 || is_non_constant_shape_array (sym)))
11871 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11872 "or of deferred shape", sym->name, &sym->declared_at);
11876 /* Make sure a parameter that has been implicitly typed still
11877 matches the implicit type, since PARAMETER statements can precede
11878 IMPLICIT statements. */
11879 if (sym->attr.implicit_type
11880 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11883 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11884 "later IMPLICIT type", sym->name, &sym->declared_at);
11888 /* Make sure the types of derived parameters are consistent. This
11889 type checking is deferred until resolution because the type may
11890 refer to a derived type from the host. */
11891 if (sym->ts.type == BT_DERIVED
11892 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11894 gfc_error ("Incompatible derived type in PARAMETER at %L",
11895 &sym->value->where);
11902 /* Do anything necessary to resolve a symbol. Right now, we just
11903 assume that an otherwise unknown symbol is a variable. This sort
11904 of thing commonly happens for symbols in module. */
11907 resolve_symbol (gfc_symbol *sym)
11909 int check_constant, mp_flag;
11910 gfc_symtree *symtree;
11911 gfc_symtree *this_symtree;
11915 if (sym->attr.flavor == FL_UNKNOWN)
11918 /* If we find that a flavorless symbol is an interface in one of the
11919 parent namespaces, find its symtree in this namespace, free the
11920 symbol and set the symtree to point to the interface symbol. */
11921 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11923 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11924 if (symtree && (symtree->n.sym->generic ||
11925 (symtree->n.sym->attr.flavor == FL_PROCEDURE
11926 && sym->ns->construct_entities)))
11928 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11930 gfc_release_symbol (sym);
11931 symtree->n.sym->refs++;
11932 this_symtree->n.sym = symtree->n.sym;
11937 /* Otherwise give it a flavor according to such attributes as
11939 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11940 sym->attr.flavor = FL_VARIABLE;
11943 sym->attr.flavor = FL_PROCEDURE;
11944 if (sym->attr.dimension)
11945 sym->attr.function = 1;
11949 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11950 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11952 if (sym->attr.procedure && sym->ts.interface
11953 && sym->attr.if_source != IFSRC_DECL
11954 && resolve_procedure_interface (sym) == FAILURE)
11957 if (sym->attr.is_protected && !sym->attr.proc_pointer
11958 && (sym->attr.procedure || sym->attr.external))
11960 if (sym->attr.external)
11961 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11962 "at %L", &sym->declared_at);
11964 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11965 "at %L", &sym->declared_at);
11972 if (sym->attr.contiguous
11973 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
11974 && !sym->attr.pointer)))
11976 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
11977 "array pointer or an assumed-shape array", sym->name,
11978 &sym->declared_at);
11982 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11985 /* Symbols that are module procedures with results (functions) have
11986 the types and array specification copied for type checking in
11987 procedures that call them, as well as for saving to a module
11988 file. These symbols can't stand the scrutiny that their results
11990 mp_flag = (sym->result != NULL && sym->result != sym);
11992 /* Make sure that the intrinsic is consistent with its internal
11993 representation. This needs to be done before assigning a default
11994 type to avoid spurious warnings. */
11995 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11996 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11999 /* Resolve associate names. */
12001 resolve_assoc_var (sym, true);
12003 /* Assign default type to symbols that need one and don't have one. */
12004 if (sym->ts.type == BT_UNKNOWN)
12006 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
12007 gfc_set_default_type (sym, 1, NULL);
12009 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
12010 && !sym->attr.function && !sym->attr.subroutine
12011 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
12012 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
12014 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12016 /* The specific case of an external procedure should emit an error
12017 in the case that there is no implicit type. */
12019 gfc_set_default_type (sym, sym->attr.external, NULL);
12022 /* Result may be in another namespace. */
12023 resolve_symbol (sym->result);
12025 if (!sym->result->attr.proc_pointer)
12027 sym->ts = sym->result->ts;
12028 sym->as = gfc_copy_array_spec (sym->result->as);
12029 sym->attr.dimension = sym->result->attr.dimension;
12030 sym->attr.pointer = sym->result->attr.pointer;
12031 sym->attr.allocatable = sym->result->attr.allocatable;
12032 sym->attr.contiguous = sym->result->attr.contiguous;
12037 else if (mp_flag && sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12038 gfc_resolve_array_spec (sym->result->as, false);
12040 /* Assumed size arrays and assumed shape arrays must be dummy
12041 arguments. Array-spec's of implied-shape should have been resolved to
12042 AS_EXPLICIT already. */
12046 gcc_assert (sym->as->type != AS_IMPLIED_SHAPE);
12047 if (((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
12048 || sym->as->type == AS_ASSUMED_SHAPE)
12049 && sym->attr.dummy == 0)
12051 if (sym->as->type == AS_ASSUMED_SIZE)
12052 gfc_error ("Assumed size array at %L must be a dummy argument",
12053 &sym->declared_at);
12055 gfc_error ("Assumed shape array at %L must be a dummy argument",
12056 &sym->declared_at);
12061 /* Make sure symbols with known intent or optional are really dummy
12062 variable. Because of ENTRY statement, this has to be deferred
12063 until resolution time. */
12065 if (!sym->attr.dummy
12066 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
12068 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
12072 if (sym->attr.value && !sym->attr.dummy)
12074 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
12075 "it is not a dummy argument", sym->name, &sym->declared_at);
12079 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
12081 gfc_charlen *cl = sym->ts.u.cl;
12082 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
12084 gfc_error ("Character dummy variable '%s' at %L with VALUE "
12085 "attribute must have constant length",
12086 sym->name, &sym->declared_at);
12090 if (sym->ts.is_c_interop
12091 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
12093 gfc_error ("C interoperable character dummy variable '%s' at %L "
12094 "with VALUE attribute must have length one",
12095 sym->name, &sym->declared_at);
12100 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
12101 do this for something that was implicitly typed because that is handled
12102 in gfc_set_default_type. Handle dummy arguments and procedure
12103 definitions separately. Also, anything that is use associated is not
12104 handled here but instead is handled in the module it is declared in.
12105 Finally, derived type definitions are allowed to be BIND(C) since that
12106 only implies that they're interoperable, and they are checked fully for
12107 interoperability when a variable is declared of that type. */
12108 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
12109 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
12110 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
12112 gfc_try t = SUCCESS;
12114 /* First, make sure the variable is declared at the
12115 module-level scope (J3/04-007, Section 15.3). */
12116 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
12117 sym->attr.in_common == 0)
12119 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
12120 "is neither a COMMON block nor declared at the "
12121 "module level scope", sym->name, &(sym->declared_at));
12124 else if (sym->common_head != NULL)
12126 t = verify_com_block_vars_c_interop (sym->common_head);
12130 /* If type() declaration, we need to verify that the components
12131 of the given type are all C interoperable, etc. */
12132 if (sym->ts.type == BT_DERIVED &&
12133 sym->ts.u.derived->attr.is_c_interop != 1)
12135 /* Make sure the user marked the derived type as BIND(C). If
12136 not, call the verify routine. This could print an error
12137 for the derived type more than once if multiple variables
12138 of that type are declared. */
12139 if (sym->ts.u.derived->attr.is_bind_c != 1)
12140 verify_bind_c_derived_type (sym->ts.u.derived);
12144 /* Verify the variable itself as C interoperable if it
12145 is BIND(C). It is not possible for this to succeed if
12146 the verify_bind_c_derived_type failed, so don't have to handle
12147 any error returned by verify_bind_c_derived_type. */
12148 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
12149 sym->common_block);
12154 /* clear the is_bind_c flag to prevent reporting errors more than
12155 once if something failed. */
12156 sym->attr.is_bind_c = 0;
12161 /* If a derived type symbol has reached this point, without its
12162 type being declared, we have an error. Notice that most
12163 conditions that produce undefined derived types have already
12164 been dealt with. However, the likes of:
12165 implicit type(t) (t) ..... call foo (t) will get us here if
12166 the type is not declared in the scope of the implicit
12167 statement. Change the type to BT_UNKNOWN, both because it is so
12168 and to prevent an ICE. */
12169 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
12170 && !sym->ts.u.derived->attr.zero_comp)
12172 gfc_error ("The derived type '%s' at %L is of type '%s', "
12173 "which has not been defined", sym->name,
12174 &sym->declared_at, sym->ts.u.derived->name);
12175 sym->ts.type = BT_UNKNOWN;
12179 /* Make sure that the derived type has been resolved and that the
12180 derived type is visible in the symbol's namespace, if it is a
12181 module function and is not PRIVATE. */
12182 if (sym->ts.type == BT_DERIVED
12183 && sym->ts.u.derived->attr.use_assoc
12184 && sym->ns->proc_name
12185 && sym->ns->proc_name->attr.flavor == FL_MODULE)
12189 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
12192 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
12193 if (!ds && sym->attr.function && gfc_check_symbol_access (sym))
12195 symtree = gfc_new_symtree (&sym->ns->sym_root,
12196 sym->ts.u.derived->name);
12197 symtree->n.sym = sym->ts.u.derived;
12198 sym->ts.u.derived->refs++;
12202 /* Unless the derived-type declaration is use associated, Fortran 95
12203 does not allow public entries of private derived types.
12204 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
12205 161 in 95-006r3. */
12206 if (sym->ts.type == BT_DERIVED
12207 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
12208 && !sym->ts.u.derived->attr.use_assoc
12209 && gfc_check_symbol_access (sym)
12210 && !gfc_check_symbol_access (sym->ts.u.derived)
12211 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
12212 "of PRIVATE derived type '%s'",
12213 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
12214 : "variable", sym->name, &sym->declared_at,
12215 sym->ts.u.derived->name) == FAILURE)
12218 /* F2008, C1302. */
12219 if (sym->ts.type == BT_DERIVED
12220 && ((sym->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
12221 && sym->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
12222 || sym->ts.u.derived->attr.lock_comp)
12223 && !sym->attr.codimension && !sym->ts.u.derived->attr.coarray_comp)
12225 gfc_error ("Variable %s at %L of type LOCK_TYPE or with subcomponent of "
12226 "type LOCK_TYPE must be a coarray", sym->name,
12227 &sym->declared_at);
12231 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
12232 default initialization is defined (5.1.2.4.4). */
12233 if (sym->ts.type == BT_DERIVED
12235 && sym->attr.intent == INTENT_OUT
12237 && sym->as->type == AS_ASSUMED_SIZE)
12239 for (c = sym->ts.u.derived->components; c; c = c->next)
12241 if (c->initializer)
12243 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
12244 "ASSUMED SIZE and so cannot have a default initializer",
12245 sym->name, &sym->declared_at);
12252 if (sym->ts.type == BT_DERIVED && sym->attr.dummy
12253 && sym->attr.intent == INTENT_OUT && sym->attr.lock_comp)
12255 gfc_error ("Dummy argument '%s' at %L of LOCK_TYPE shall not be "
12256 "INTENT(OUT)", sym->name, &sym->declared_at);
12261 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12262 || sym->attr.codimension)
12263 && (sym->attr.result || sym->result == sym))
12265 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
12266 "a coarray component", sym->name, &sym->declared_at);
12271 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
12272 && sym->ts.u.derived->ts.is_iso_c)
12274 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
12275 "shall not be a coarray", sym->name, &sym->declared_at);
12280 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
12281 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
12282 || sym->attr.allocatable))
12284 gfc_error ("Variable '%s' at %L with coarray component "
12285 "shall be a nonpointer, nonallocatable scalar",
12286 sym->name, &sym->declared_at);
12290 /* F2008, C526. The function-result case was handled above. */
12291 if (sym->attr.codimension
12292 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
12293 || sym->ns->save_all
12294 || sym->ns->proc_name->attr.flavor == FL_MODULE
12295 || sym->ns->proc_name->attr.is_main_program
12296 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
12298 gfc_error ("Variable '%s' at %L is a coarray and is not ALLOCATABLE, SAVE "
12299 "nor a dummy argument", sym->name, &sym->declared_at);
12302 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
12303 else if (sym->attr.codimension && !sym->attr.allocatable
12304 && sym->as && sym->as->cotype == AS_DEFERRED)
12306 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
12307 "deferred shape", sym->name, &sym->declared_at);
12310 else if (sym->attr.codimension && sym->attr.allocatable
12311 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
12313 gfc_error ("Allocatable coarray variable '%s' at %L must have "
12314 "deferred shape", sym->name, &sym->declared_at);
12319 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12320 || (sym->attr.codimension && sym->attr.allocatable))
12321 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
12323 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
12324 "allocatable coarray or have coarray components",
12325 sym->name, &sym->declared_at);
12329 if (sym->attr.codimension && sym->attr.dummy
12330 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
12332 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
12333 "procedure '%s'", sym->name, &sym->declared_at,
12334 sym->ns->proc_name->name);
12338 switch (sym->attr.flavor)
12341 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
12346 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
12351 if (resolve_fl_namelist (sym) == FAILURE)
12356 if (resolve_fl_parameter (sym) == FAILURE)
12364 /* Resolve array specifier. Check as well some constraints
12365 on COMMON blocks. */
12367 check_constant = sym->attr.in_common && !sym->attr.pointer;
12369 /* Set the formal_arg_flag so that check_conflict will not throw
12370 an error for host associated variables in the specification
12371 expression for an array_valued function. */
12372 if (sym->attr.function && sym->as)
12373 formal_arg_flag = 1;
12375 gfc_resolve_array_spec (sym->as, check_constant);
12377 formal_arg_flag = 0;
12379 /* Resolve formal namespaces. */
12380 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
12381 && !sym->attr.contained && !sym->attr.intrinsic)
12382 gfc_resolve (sym->formal_ns);
12384 /* Make sure the formal namespace is present. */
12385 if (sym->formal && !sym->formal_ns)
12387 gfc_formal_arglist *formal = sym->formal;
12388 while (formal && !formal->sym)
12389 formal = formal->next;
12393 sym->formal_ns = formal->sym->ns;
12394 sym->formal_ns->refs++;
12398 /* Check threadprivate restrictions. */
12399 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
12400 && (!sym->attr.in_common
12401 && sym->module == NULL
12402 && (sym->ns->proc_name == NULL
12403 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
12404 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
12406 /* If we have come this far we can apply default-initializers, as
12407 described in 14.7.5, to those variables that have not already
12408 been assigned one. */
12409 if (sym->ts.type == BT_DERIVED
12410 && sym->ns == gfc_current_ns
12412 && !sym->attr.allocatable
12413 && !sym->attr.alloc_comp)
12415 symbol_attribute *a = &sym->attr;
12417 if ((!a->save && !a->dummy && !a->pointer
12418 && !a->in_common && !a->use_assoc
12419 && (a->referenced || a->result)
12420 && !(a->function && sym != sym->result))
12421 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
12422 apply_default_init (sym);
12425 if (sym->ts.type == BT_CLASS && sym->ns == gfc_current_ns
12426 && sym->attr.dummy && sym->attr.intent == INTENT_OUT
12427 && !CLASS_DATA (sym)->attr.class_pointer
12428 && !CLASS_DATA (sym)->attr.allocatable)
12429 apply_default_init (sym);
12431 /* If this symbol has a type-spec, check it. */
12432 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
12433 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
12434 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
12440 /************* Resolve DATA statements *************/
12444 gfc_data_value *vnode;
12450 /* Advance the values structure to point to the next value in the data list. */
12453 next_data_value (void)
12455 while (mpz_cmp_ui (values.left, 0) == 0)
12458 if (values.vnode->next == NULL)
12461 values.vnode = values.vnode->next;
12462 mpz_set (values.left, values.vnode->repeat);
12470 check_data_variable (gfc_data_variable *var, locus *where)
12476 ar_type mark = AR_UNKNOWN;
12478 mpz_t section_index[GFC_MAX_DIMENSIONS];
12484 if (gfc_resolve_expr (var->expr) == FAILURE)
12488 mpz_init_set_si (offset, 0);
12491 if (e->expr_type != EXPR_VARIABLE)
12492 gfc_internal_error ("check_data_variable(): Bad expression");
12494 sym = e->symtree->n.sym;
12496 if (sym->ns->is_block_data && !sym->attr.in_common)
12498 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
12499 sym->name, &sym->declared_at);
12502 if (e->ref == NULL && sym->as)
12504 gfc_error ("DATA array '%s' at %L must be specified in a previous"
12505 " declaration", sym->name, where);
12509 has_pointer = sym->attr.pointer;
12511 if (gfc_is_coindexed (e))
12513 gfc_error ("DATA element '%s' at %L cannot have a coindex", sym->name,
12518 for (ref = e->ref; ref; ref = ref->next)
12520 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
12524 && ref->type == REF_ARRAY
12525 && ref->u.ar.type != AR_FULL)
12527 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12528 "be a full array", sym->name, where);
12533 if (e->rank == 0 || has_pointer)
12535 mpz_init_set_ui (size, 1);
12542 /* Find the array section reference. */
12543 for (ref = e->ref; ref; ref = ref->next)
12545 if (ref->type != REF_ARRAY)
12547 if (ref->u.ar.type == AR_ELEMENT)
12553 /* Set marks according to the reference pattern. */
12554 switch (ref->u.ar.type)
12562 /* Get the start position of array section. */
12563 gfc_get_section_index (ar, section_index, &offset);
12568 gcc_unreachable ();
12571 if (gfc_array_size (e, &size) == FAILURE)
12573 gfc_error ("Nonconstant array section at %L in DATA statement",
12575 mpz_clear (offset);
12582 while (mpz_cmp_ui (size, 0) > 0)
12584 if (next_data_value () == FAILURE)
12586 gfc_error ("DATA statement at %L has more variables than values",
12592 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12596 /* If we have more than one element left in the repeat count,
12597 and we have more than one element left in the target variable,
12598 then create a range assignment. */
12599 /* FIXME: Only done for full arrays for now, since array sections
12601 if (mark == AR_FULL && ref && ref->next == NULL
12602 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12606 if (mpz_cmp (size, values.left) >= 0)
12608 mpz_init_set (range, values.left);
12609 mpz_sub (size, size, values.left);
12610 mpz_set_ui (values.left, 0);
12614 mpz_init_set (range, size);
12615 mpz_sub (values.left, values.left, size);
12616 mpz_set_ui (size, 0);
12619 t = gfc_assign_data_value (var->expr, values.vnode->expr,
12622 mpz_add (offset, offset, range);
12629 /* Assign initial value to symbol. */
12632 mpz_sub_ui (values.left, values.left, 1);
12633 mpz_sub_ui (size, size, 1);
12635 t = gfc_assign_data_value (var->expr, values.vnode->expr,
12640 if (mark == AR_FULL)
12641 mpz_add_ui (offset, offset, 1);
12643 /* Modify the array section indexes and recalculate the offset
12644 for next element. */
12645 else if (mark == AR_SECTION)
12646 gfc_advance_section (section_index, ar, &offset);
12650 if (mark == AR_SECTION)
12652 for (i = 0; i < ar->dimen; i++)
12653 mpz_clear (section_index[i]);
12657 mpz_clear (offset);
12663 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12665 /* Iterate over a list of elements in a DATA statement. */
12668 traverse_data_list (gfc_data_variable *var, locus *where)
12671 iterator_stack frame;
12672 gfc_expr *e, *start, *end, *step;
12673 gfc_try retval = SUCCESS;
12675 mpz_init (frame.value);
12678 start = gfc_copy_expr (var->iter.start);
12679 end = gfc_copy_expr (var->iter.end);
12680 step = gfc_copy_expr (var->iter.step);
12682 if (gfc_simplify_expr (start, 1) == FAILURE
12683 || start->expr_type != EXPR_CONSTANT)
12685 gfc_error ("start of implied-do loop at %L could not be "
12686 "simplified to a constant value", &start->where);
12690 if (gfc_simplify_expr (end, 1) == FAILURE
12691 || end->expr_type != EXPR_CONSTANT)
12693 gfc_error ("end of implied-do loop at %L could not be "
12694 "simplified to a constant value", &start->where);
12698 if (gfc_simplify_expr (step, 1) == FAILURE
12699 || step->expr_type != EXPR_CONSTANT)
12701 gfc_error ("step of implied-do loop at %L could not be "
12702 "simplified to a constant value", &start->where);
12707 mpz_set (trip, end->value.integer);
12708 mpz_sub (trip, trip, start->value.integer);
12709 mpz_add (trip, trip, step->value.integer);
12711 mpz_div (trip, trip, step->value.integer);
12713 mpz_set (frame.value, start->value.integer);
12715 frame.prev = iter_stack;
12716 frame.variable = var->iter.var->symtree;
12717 iter_stack = &frame;
12719 while (mpz_cmp_ui (trip, 0) > 0)
12721 if (traverse_data_var (var->list, where) == FAILURE)
12727 e = gfc_copy_expr (var->expr);
12728 if (gfc_simplify_expr (e, 1) == FAILURE)
12735 mpz_add (frame.value, frame.value, step->value.integer);
12737 mpz_sub_ui (trip, trip, 1);
12741 mpz_clear (frame.value);
12744 gfc_free_expr (start);
12745 gfc_free_expr (end);
12746 gfc_free_expr (step);
12748 iter_stack = frame.prev;
12753 /* Type resolve variables in the variable list of a DATA statement. */
12756 traverse_data_var (gfc_data_variable *var, locus *where)
12760 for (; var; var = var->next)
12762 if (var->expr == NULL)
12763 t = traverse_data_list (var, where);
12765 t = check_data_variable (var, where);
12775 /* Resolve the expressions and iterators associated with a data statement.
12776 This is separate from the assignment checking because data lists should
12777 only be resolved once. */
12780 resolve_data_variables (gfc_data_variable *d)
12782 for (; d; d = d->next)
12784 if (d->list == NULL)
12786 if (gfc_resolve_expr (d->expr) == FAILURE)
12791 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12794 if (resolve_data_variables (d->list) == FAILURE)
12803 /* Resolve a single DATA statement. We implement this by storing a pointer to
12804 the value list into static variables, and then recursively traversing the
12805 variables list, expanding iterators and such. */
12808 resolve_data (gfc_data *d)
12811 if (resolve_data_variables (d->var) == FAILURE)
12814 values.vnode = d->value;
12815 if (d->value == NULL)
12816 mpz_set_ui (values.left, 0);
12818 mpz_set (values.left, d->value->repeat);
12820 if (traverse_data_var (d->var, &d->where) == FAILURE)
12823 /* At this point, we better not have any values left. */
12825 if (next_data_value () == SUCCESS)
12826 gfc_error ("DATA statement at %L has more values than variables",
12831 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12832 accessed by host or use association, is a dummy argument to a pure function,
12833 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12834 is storage associated with any such variable, shall not be used in the
12835 following contexts: (clients of this function). */
12837 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12838 procedure. Returns zero if assignment is OK, nonzero if there is a
12841 gfc_impure_variable (gfc_symbol *sym)
12846 if (sym->attr.use_assoc || sym->attr.in_common)
12849 /* Check if the symbol's ns is inside the pure procedure. */
12850 for (ns = gfc_current_ns; ns; ns = ns->parent)
12854 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12858 proc = sym->ns->proc_name;
12859 if (sym->attr.dummy && gfc_pure (proc)
12860 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12862 proc->attr.function))
12865 /* TODO: Sort out what can be storage associated, if anything, and include
12866 it here. In principle equivalences should be scanned but it does not
12867 seem to be possible to storage associate an impure variable this way. */
12872 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12873 current namespace is inside a pure procedure. */
12876 gfc_pure (gfc_symbol *sym)
12878 symbol_attribute attr;
12883 /* Check if the current namespace or one of its parents
12884 belongs to a pure procedure. */
12885 for (ns = gfc_current_ns; ns; ns = ns->parent)
12887 sym = ns->proc_name;
12891 if (attr.flavor == FL_PROCEDURE && attr.pure)
12899 return attr.flavor == FL_PROCEDURE && attr.pure;
12903 /* Test whether a symbol is implicitly pure or not. For a NULL pointer,
12904 checks if the current namespace is implicitly pure. Note that this
12905 function returns false for a PURE procedure. */
12908 gfc_implicit_pure (gfc_symbol *sym)
12910 symbol_attribute attr;
12914 /* Check if the current namespace is implicit_pure. */
12915 sym = gfc_current_ns->proc_name;
12919 if (attr.flavor == FL_PROCEDURE
12920 && attr.implicit_pure && !attr.pure)
12927 return attr.flavor == FL_PROCEDURE && attr.implicit_pure && !attr.pure;
12931 /* Test whether the current procedure is elemental or not. */
12934 gfc_elemental (gfc_symbol *sym)
12936 symbol_attribute attr;
12939 sym = gfc_current_ns->proc_name;
12944 return attr.flavor == FL_PROCEDURE && attr.elemental;
12948 /* Warn about unused labels. */
12951 warn_unused_fortran_label (gfc_st_label *label)
12956 warn_unused_fortran_label (label->left);
12958 if (label->defined == ST_LABEL_UNKNOWN)
12961 switch (label->referenced)
12963 case ST_LABEL_UNKNOWN:
12964 gfc_warning ("Label %d at %L defined but not used", label->value,
12968 case ST_LABEL_BAD_TARGET:
12969 gfc_warning ("Label %d at %L defined but cannot be used",
12970 label->value, &label->where);
12977 warn_unused_fortran_label (label->right);
12981 /* Returns the sequence type of a symbol or sequence. */
12984 sequence_type (gfc_typespec ts)
12993 if (ts.u.derived->components == NULL)
12994 return SEQ_NONDEFAULT;
12996 result = sequence_type (ts.u.derived->components->ts);
12997 for (c = ts.u.derived->components->next; c; c = c->next)
12998 if (sequence_type (c->ts) != result)
13004 if (ts.kind != gfc_default_character_kind)
13005 return SEQ_NONDEFAULT;
13007 return SEQ_CHARACTER;
13010 if (ts.kind != gfc_default_integer_kind)
13011 return SEQ_NONDEFAULT;
13013 return SEQ_NUMERIC;
13016 if (!(ts.kind == gfc_default_real_kind
13017 || ts.kind == gfc_default_double_kind))
13018 return SEQ_NONDEFAULT;
13020 return SEQ_NUMERIC;
13023 if (ts.kind != gfc_default_complex_kind)
13024 return SEQ_NONDEFAULT;
13026 return SEQ_NUMERIC;
13029 if (ts.kind != gfc_default_logical_kind)
13030 return SEQ_NONDEFAULT;
13032 return SEQ_NUMERIC;
13035 return SEQ_NONDEFAULT;
13040 /* Resolve derived type EQUIVALENCE object. */
13043 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
13045 gfc_component *c = derived->components;
13050 /* Shall not be an object of nonsequence derived type. */
13051 if (!derived->attr.sequence)
13053 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
13054 "attribute to be an EQUIVALENCE object", sym->name,
13059 /* Shall not have allocatable components. */
13060 if (derived->attr.alloc_comp)
13062 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
13063 "components to be an EQUIVALENCE object",sym->name,
13068 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
13070 gfc_error ("Derived type variable '%s' at %L with default "
13071 "initialization cannot be in EQUIVALENCE with a variable "
13072 "in COMMON", sym->name, &e->where);
13076 for (; c ; c = c->next)
13078 if (c->ts.type == BT_DERIVED
13079 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
13082 /* Shall not be an object of sequence derived type containing a pointer
13083 in the structure. */
13084 if (c->attr.pointer)
13086 gfc_error ("Derived type variable '%s' at %L with pointer "
13087 "component(s) cannot be an EQUIVALENCE object",
13088 sym->name, &e->where);
13096 /* Resolve equivalence object.
13097 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
13098 an allocatable array, an object of nonsequence derived type, an object of
13099 sequence derived type containing a pointer at any level of component
13100 selection, an automatic object, a function name, an entry name, a result
13101 name, a named constant, a structure component, or a subobject of any of
13102 the preceding objects. A substring shall not have length zero. A
13103 derived type shall not have components with default initialization nor
13104 shall two objects of an equivalence group be initialized.
13105 Either all or none of the objects shall have an protected attribute.
13106 The simple constraints are done in symbol.c(check_conflict) and the rest
13107 are implemented here. */
13110 resolve_equivalence (gfc_equiv *eq)
13113 gfc_symbol *first_sym;
13116 locus *last_where = NULL;
13117 seq_type eq_type, last_eq_type;
13118 gfc_typespec *last_ts;
13119 int object, cnt_protected;
13122 last_ts = &eq->expr->symtree->n.sym->ts;
13124 first_sym = eq->expr->symtree->n.sym;
13128 for (object = 1; eq; eq = eq->eq, object++)
13132 e->ts = e->symtree->n.sym->ts;
13133 /* match_varspec might not know yet if it is seeing
13134 array reference or substring reference, as it doesn't
13136 if (e->ref && e->ref->type == REF_ARRAY)
13138 gfc_ref *ref = e->ref;
13139 sym = e->symtree->n.sym;
13141 if (sym->attr.dimension)
13143 ref->u.ar.as = sym->as;
13147 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
13148 if (e->ts.type == BT_CHARACTER
13150 && ref->type == REF_ARRAY
13151 && ref->u.ar.dimen == 1
13152 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
13153 && ref->u.ar.stride[0] == NULL)
13155 gfc_expr *start = ref->u.ar.start[0];
13156 gfc_expr *end = ref->u.ar.end[0];
13159 /* Optimize away the (:) reference. */
13160 if (start == NULL && end == NULL)
13163 e->ref = ref->next;
13165 e->ref->next = ref->next;
13170 ref->type = REF_SUBSTRING;
13172 start = gfc_get_int_expr (gfc_default_integer_kind,
13174 ref->u.ss.start = start;
13175 if (end == NULL && e->ts.u.cl)
13176 end = gfc_copy_expr (e->ts.u.cl->length);
13177 ref->u.ss.end = end;
13178 ref->u.ss.length = e->ts.u.cl;
13185 /* Any further ref is an error. */
13188 gcc_assert (ref->type == REF_ARRAY);
13189 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
13195 if (gfc_resolve_expr (e) == FAILURE)
13198 sym = e->symtree->n.sym;
13200 if (sym->attr.is_protected)
13202 if (cnt_protected > 0 && cnt_protected != object)
13204 gfc_error ("Either all or none of the objects in the "
13205 "EQUIVALENCE set at %L shall have the "
13206 "PROTECTED attribute",
13211 /* Shall not equivalence common block variables in a PURE procedure. */
13212 if (sym->ns->proc_name
13213 && sym->ns->proc_name->attr.pure
13214 && sym->attr.in_common)
13216 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
13217 "object in the pure procedure '%s'",
13218 sym->name, &e->where, sym->ns->proc_name->name);
13222 /* Shall not be a named constant. */
13223 if (e->expr_type == EXPR_CONSTANT)
13225 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
13226 "object", sym->name, &e->where);
13230 if (e->ts.type == BT_DERIVED
13231 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
13234 /* Check that the types correspond correctly:
13236 A numeric sequence structure may be equivalenced to another sequence
13237 structure, an object of default integer type, default real type, double
13238 precision real type, default logical type such that components of the
13239 structure ultimately only become associated to objects of the same
13240 kind. A character sequence structure may be equivalenced to an object
13241 of default character kind or another character sequence structure.
13242 Other objects may be equivalenced only to objects of the same type and
13243 kind parameters. */
13245 /* Identical types are unconditionally OK. */
13246 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
13247 goto identical_types;
13249 last_eq_type = sequence_type (*last_ts);
13250 eq_type = sequence_type (sym->ts);
13252 /* Since the pair of objects is not of the same type, mixed or
13253 non-default sequences can be rejected. */
13255 msg = "Sequence %s with mixed components in EQUIVALENCE "
13256 "statement at %L with different type objects";
13258 && last_eq_type == SEQ_MIXED
13259 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
13261 || (eq_type == SEQ_MIXED
13262 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13263 &e->where) == FAILURE))
13266 msg = "Non-default type object or sequence %s in EQUIVALENCE "
13267 "statement at %L with objects of different type";
13269 && last_eq_type == SEQ_NONDEFAULT
13270 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
13271 last_where) == FAILURE)
13272 || (eq_type == SEQ_NONDEFAULT
13273 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13274 &e->where) == FAILURE))
13277 msg ="Non-CHARACTER object '%s' in default CHARACTER "
13278 "EQUIVALENCE statement at %L";
13279 if (last_eq_type == SEQ_CHARACTER
13280 && eq_type != SEQ_CHARACTER
13281 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13282 &e->where) == FAILURE)
13285 msg ="Non-NUMERIC object '%s' in default NUMERIC "
13286 "EQUIVALENCE statement at %L";
13287 if (last_eq_type == SEQ_NUMERIC
13288 && eq_type != SEQ_NUMERIC
13289 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13290 &e->where) == FAILURE)
13295 last_where = &e->where;
13300 /* Shall not be an automatic array. */
13301 if (e->ref->type == REF_ARRAY
13302 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
13304 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
13305 "an EQUIVALENCE object", sym->name, &e->where);
13312 /* Shall not be a structure component. */
13313 if (r->type == REF_COMPONENT)
13315 gfc_error ("Structure component '%s' at %L cannot be an "
13316 "EQUIVALENCE object",
13317 r->u.c.component->name, &e->where);
13321 /* A substring shall not have length zero. */
13322 if (r->type == REF_SUBSTRING)
13324 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
13326 gfc_error ("Substring at %L has length zero",
13327 &r->u.ss.start->where);
13337 /* Resolve function and ENTRY types, issue diagnostics if needed. */
13340 resolve_fntype (gfc_namespace *ns)
13342 gfc_entry_list *el;
13345 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
13348 /* If there are any entries, ns->proc_name is the entry master
13349 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
13351 sym = ns->entries->sym;
13353 sym = ns->proc_name;
13354 if (sym->result == sym
13355 && sym->ts.type == BT_UNKNOWN
13356 && gfc_set_default_type (sym, 0, NULL) == FAILURE
13357 && !sym->attr.untyped)
13359 gfc_error ("Function '%s' at %L has no IMPLICIT type",
13360 sym->name, &sym->declared_at);
13361 sym->attr.untyped = 1;
13364 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
13365 && !sym->attr.contained
13366 && !gfc_check_symbol_access (sym->ts.u.derived)
13367 && gfc_check_symbol_access (sym))
13369 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
13370 "%L of PRIVATE type '%s'", sym->name,
13371 &sym->declared_at, sym->ts.u.derived->name);
13375 for (el = ns->entries->next; el; el = el->next)
13377 if (el->sym->result == el->sym
13378 && el->sym->ts.type == BT_UNKNOWN
13379 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
13380 && !el->sym->attr.untyped)
13382 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
13383 el->sym->name, &el->sym->declared_at);
13384 el->sym->attr.untyped = 1;
13390 /* 12.3.2.1.1 Defined operators. */
13393 check_uop_procedure (gfc_symbol *sym, locus where)
13395 gfc_formal_arglist *formal;
13397 if (!sym->attr.function)
13399 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
13400 sym->name, &where);
13404 if (sym->ts.type == BT_CHARACTER
13405 && !(sym->ts.u.cl && sym->ts.u.cl->length)
13406 && !(sym->result && sym->result->ts.u.cl
13407 && sym->result->ts.u.cl->length))
13409 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
13410 "character length", sym->name, &where);
13414 formal = sym->formal;
13415 if (!formal || !formal->sym)
13417 gfc_error ("User operator procedure '%s' at %L must have at least "
13418 "one argument", sym->name, &where);
13422 if (formal->sym->attr.intent != INTENT_IN)
13424 gfc_error ("First argument of operator interface at %L must be "
13425 "INTENT(IN)", &where);
13429 if (formal->sym->attr.optional)
13431 gfc_error ("First argument of operator interface at %L cannot be "
13432 "optional", &where);
13436 formal = formal->next;
13437 if (!formal || !formal->sym)
13440 if (formal->sym->attr.intent != INTENT_IN)
13442 gfc_error ("Second argument of operator interface at %L must be "
13443 "INTENT(IN)", &where);
13447 if (formal->sym->attr.optional)
13449 gfc_error ("Second argument of operator interface at %L cannot be "
13450 "optional", &where);
13456 gfc_error ("Operator interface at %L must have, at most, two "
13457 "arguments", &where);
13465 gfc_resolve_uops (gfc_symtree *symtree)
13467 gfc_interface *itr;
13469 if (symtree == NULL)
13472 gfc_resolve_uops (symtree->left);
13473 gfc_resolve_uops (symtree->right);
13475 for (itr = symtree->n.uop->op; itr; itr = itr->next)
13476 check_uop_procedure (itr->sym, itr->sym->declared_at);
13480 /* Examine all of the expressions associated with a program unit,
13481 assign types to all intermediate expressions, make sure that all
13482 assignments are to compatible types and figure out which names
13483 refer to which functions or subroutines. It doesn't check code
13484 block, which is handled by resolve_code. */
13487 resolve_types (gfc_namespace *ns)
13493 gfc_namespace* old_ns = gfc_current_ns;
13495 /* Check that all IMPLICIT types are ok. */
13496 if (!ns->seen_implicit_none)
13499 for (letter = 0; letter != GFC_LETTERS; ++letter)
13500 if (ns->set_flag[letter]
13501 && resolve_typespec_used (&ns->default_type[letter],
13502 &ns->implicit_loc[letter],
13507 gfc_current_ns = ns;
13509 resolve_entries (ns);
13511 resolve_common_vars (ns->blank_common.head, false);
13512 resolve_common_blocks (ns->common_root);
13514 resolve_contained_functions (ns);
13516 if (ns->proc_name && ns->proc_name->attr.flavor == FL_PROCEDURE
13517 && ns->proc_name->attr.if_source == IFSRC_IFBODY)
13518 resolve_formal_arglist (ns->proc_name);
13520 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
13522 for (cl = ns->cl_list; cl; cl = cl->next)
13523 resolve_charlen (cl);
13525 gfc_traverse_ns (ns, resolve_symbol);
13527 resolve_fntype (ns);
13529 for (n = ns->contained; n; n = n->sibling)
13531 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
13532 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
13533 "also be PURE", n->proc_name->name,
13534 &n->proc_name->declared_at);
13540 gfc_check_interfaces (ns);
13542 gfc_traverse_ns (ns, resolve_values);
13548 for (d = ns->data; d; d = d->next)
13552 gfc_traverse_ns (ns, gfc_formalize_init_value);
13554 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13556 if (ns->common_root != NULL)
13557 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13559 for (eq = ns->equiv; eq; eq = eq->next)
13560 resolve_equivalence (eq);
13562 /* Warn about unused labels. */
13563 if (warn_unused_label)
13564 warn_unused_fortran_label (ns->st_labels);
13566 gfc_resolve_uops (ns->uop_root);
13568 gfc_current_ns = old_ns;
13572 /* Call resolve_code recursively. */
13575 resolve_codes (gfc_namespace *ns)
13578 bitmap_obstack old_obstack;
13580 if (ns->resolved == 1)
13583 for (n = ns->contained; n; n = n->sibling)
13586 gfc_current_ns = ns;
13588 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13589 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13592 /* Set to an out of range value. */
13593 current_entry_id = -1;
13595 old_obstack = labels_obstack;
13596 bitmap_obstack_initialize (&labels_obstack);
13598 resolve_code (ns->code, ns);
13600 bitmap_obstack_release (&labels_obstack);
13601 labels_obstack = old_obstack;
13605 /* This function is called after a complete program unit has been compiled.
13606 Its purpose is to examine all of the expressions associated with a program
13607 unit, assign types to all intermediate expressions, make sure that all
13608 assignments are to compatible types and figure out which names refer to
13609 which functions or subroutines. */
13612 gfc_resolve (gfc_namespace *ns)
13614 gfc_namespace *old_ns;
13615 code_stack *old_cs_base;
13621 old_ns = gfc_current_ns;
13622 old_cs_base = cs_base;
13624 resolve_types (ns);
13625 resolve_codes (ns);
13627 gfc_current_ns = old_ns;
13628 cs_base = old_cs_base;
13631 gfc_run_passes (ns);