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 /* Resolve all of the elements of a structure constructor and make sure that
954 the types are correct. The 'init' flag indicates that the given
955 constructor is an initializer. */
958 resolve_structure_cons (gfc_expr *expr, int init)
960 gfc_constructor *cons;
967 if (expr->ts.type == BT_DERIVED)
968 resolve_symbol (expr->ts.u.derived);
970 cons = gfc_constructor_first (expr->value.constructor);
971 /* A constructor may have references if it is the result of substituting a
972 parameter variable. In this case we just pull out the component we
975 comp = expr->ref->u.c.sym->components;
977 comp = expr->ts.u.derived->components;
979 /* See if the user is trying to invoke a structure constructor for one of
980 the iso_c_binding derived types. */
981 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
982 && expr->ts.u.derived->ts.is_iso_c && cons
983 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
985 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
986 expr->ts.u.derived->name, &(expr->where));
990 /* Return if structure constructor is c_null_(fun)prt. */
991 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
992 && expr->ts.u.derived->ts.is_iso_c && cons
993 && cons->expr && cons->expr->expr_type == EXPR_NULL)
996 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
1003 if (gfc_resolve_expr (cons->expr) == FAILURE)
1009 rank = comp->as ? comp->as->rank : 0;
1010 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
1011 && (comp->attr.allocatable || cons->expr->rank))
1013 gfc_error ("The rank of the element in the derived type "
1014 "constructor at %L does not match that of the "
1015 "component (%d/%d)", &cons->expr->where,
1016 cons->expr->rank, rank);
1020 /* If we don't have the right type, try to convert it. */
1022 if (!comp->attr.proc_pointer &&
1023 !gfc_compare_types (&cons->expr->ts, &comp->ts))
1026 if (strcmp (comp->name, "_extends") == 0)
1028 /* Can afford to be brutal with the _extends initializer.
1029 The derived type can get lost because it is PRIVATE
1030 but it is not usage constrained by the standard. */
1031 cons->expr->ts = comp->ts;
1034 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
1035 gfc_error ("The element in the derived type constructor at %L, "
1036 "for pointer component '%s', is %s but should be %s",
1037 &cons->expr->where, comp->name,
1038 gfc_basic_typename (cons->expr->ts.type),
1039 gfc_basic_typename (comp->ts.type));
1041 t = gfc_convert_type (cons->expr, &comp->ts, 1);
1044 /* For strings, the length of the constructor should be the same as
1045 the one of the structure, ensure this if the lengths are known at
1046 compile time and when we are dealing with PARAMETER or structure
1048 if (cons->expr->ts.type == BT_CHARACTER && comp->ts.u.cl
1049 && comp->ts.u.cl->length
1050 && comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
1051 && cons->expr->ts.u.cl && cons->expr->ts.u.cl->length
1052 && cons->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
1053 && mpz_cmp (cons->expr->ts.u.cl->length->value.integer,
1054 comp->ts.u.cl->length->value.integer) != 0)
1056 if (cons->expr->expr_type == EXPR_VARIABLE
1057 && cons->expr->symtree->n.sym->attr.flavor == FL_PARAMETER)
1059 /* Wrap the parameter in an array constructor (EXPR_ARRAY)
1060 to make use of the gfc_resolve_character_array_constructor
1061 machinery. The expression is later simplified away to
1062 an array of string literals. */
1063 gfc_expr *para = cons->expr;
1064 cons->expr = gfc_get_expr ();
1065 cons->expr->ts = para->ts;
1066 cons->expr->where = para->where;
1067 cons->expr->expr_type = EXPR_ARRAY;
1068 cons->expr->rank = para->rank;
1069 cons->expr->shape = gfc_copy_shape (para->shape, para->rank);
1070 gfc_constructor_append_expr (&cons->expr->value.constructor,
1071 para, &cons->expr->where);
1073 if (cons->expr->expr_type == EXPR_ARRAY)
1076 p = gfc_constructor_first (cons->expr->value.constructor);
1077 if (cons->expr->ts.u.cl != p->expr->ts.u.cl)
1079 gfc_charlen *cl, *cl2;
1082 for (cl = gfc_current_ns->cl_list; cl; cl = cl->next)
1084 if (cl == cons->expr->ts.u.cl)
1092 cl2->next = cl->next;
1094 gfc_free_expr (cl->length);
1098 cons->expr->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1099 cons->expr->ts.u.cl->length_from_typespec = true;
1100 cons->expr->ts.u.cl->length = gfc_copy_expr (comp->ts.u.cl->length);
1101 gfc_resolve_character_array_constructor (cons->expr);
1105 if (cons->expr->expr_type == EXPR_NULL
1106 && !(comp->attr.pointer || comp->attr.allocatable
1107 || comp->attr.proc_pointer
1108 || (comp->ts.type == BT_CLASS
1109 && (CLASS_DATA (comp)->attr.class_pointer
1110 || CLASS_DATA (comp)->attr.allocatable))))
1113 gfc_error ("The NULL in the derived type constructor at %L is "
1114 "being applied to component '%s', which is neither "
1115 "a POINTER nor ALLOCATABLE", &cons->expr->where,
1119 if (!comp->attr.pointer || comp->attr.proc_pointer
1120 || cons->expr->expr_type == EXPR_NULL)
1123 a = gfc_expr_attr (cons->expr);
1125 if (!a.pointer && !a.target)
1128 gfc_error ("The element in the derived type constructor at %L, "
1129 "for pointer component '%s' should be a POINTER or "
1130 "a TARGET", &cons->expr->where, comp->name);
1135 /* F08:C461. Additional checks for pointer initialization. */
1139 gfc_error ("Pointer initialization target at %L "
1140 "must not be ALLOCATABLE ", &cons->expr->where);
1145 gfc_error ("Pointer initialization target at %L "
1146 "must have the SAVE attribute", &cons->expr->where);
1150 /* F2003, C1272 (3). */
1151 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
1152 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1153 || gfc_is_coindexed (cons->expr)))
1156 gfc_error ("Invalid expression in the derived type constructor for "
1157 "pointer component '%s' at %L in PURE procedure",
1158 comp->name, &cons->expr->where);
1161 if (gfc_implicit_pure (NULL)
1162 && cons->expr->expr_type == EXPR_VARIABLE
1163 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1164 || gfc_is_coindexed (cons->expr)))
1165 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1173 /****************** Expression name resolution ******************/
1175 /* Returns 0 if a symbol was not declared with a type or
1176 attribute declaration statement, nonzero otherwise. */
1179 was_declared (gfc_symbol *sym)
1185 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
1188 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
1189 || a.optional || a.pointer || a.save || a.target || a.volatile_
1190 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
1191 || a.asynchronous || a.codimension)
1198 /* Determine if a symbol is generic or not. */
1201 generic_sym (gfc_symbol *sym)
1205 if (sym->attr.generic ||
1206 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
1209 if (was_declared (sym) || sym->ns->parent == NULL)
1212 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1219 return generic_sym (s);
1226 /* Determine if a symbol is specific or not. */
1229 specific_sym (gfc_symbol *sym)
1233 if (sym->attr.if_source == IFSRC_IFBODY
1234 || sym->attr.proc == PROC_MODULE
1235 || sym->attr.proc == PROC_INTERNAL
1236 || sym->attr.proc == PROC_ST_FUNCTION
1237 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1238 || sym->attr.external)
1241 if (was_declared (sym) || sym->ns->parent == NULL)
1244 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1246 return (s == NULL) ? 0 : specific_sym (s);
1250 /* Figure out if the procedure is specific, generic or unknown. */
1253 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1257 procedure_kind (gfc_symbol *sym)
1259 if (generic_sym (sym))
1260 return PTYPE_GENERIC;
1262 if (specific_sym (sym))
1263 return PTYPE_SPECIFIC;
1265 return PTYPE_UNKNOWN;
1268 /* Check references to assumed size arrays. The flag need_full_assumed_size
1269 is nonzero when matching actual arguments. */
1271 static int need_full_assumed_size = 0;
1274 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1276 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1279 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1280 What should it be? */
1281 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1282 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1283 && (e->ref->u.ar.type == AR_FULL))
1285 gfc_error ("The upper bound in the last dimension must "
1286 "appear in the reference to the assumed size "
1287 "array '%s' at %L", sym->name, &e->where);
1294 /* Look for bad assumed size array references in argument expressions
1295 of elemental and array valued intrinsic procedures. Since this is
1296 called from procedure resolution functions, it only recurses at
1300 resolve_assumed_size_actual (gfc_expr *e)
1305 switch (e->expr_type)
1308 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1313 if (resolve_assumed_size_actual (e->value.op.op1)
1314 || resolve_assumed_size_actual (e->value.op.op2))
1325 /* Check a generic procedure, passed as an actual argument, to see if
1326 there is a matching specific name. If none, it is an error, and if
1327 more than one, the reference is ambiguous. */
1329 count_specific_procs (gfc_expr *e)
1336 sym = e->symtree->n.sym;
1338 for (p = sym->generic; p; p = p->next)
1339 if (strcmp (sym->name, p->sym->name) == 0)
1341 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1347 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1351 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1352 "argument at %L", sym->name, &e->where);
1358 /* See if a call to sym could possibly be a not allowed RECURSION because of
1359 a missing RECURIVE declaration. This means that either sym is the current
1360 context itself, or sym is the parent of a contained procedure calling its
1361 non-RECURSIVE containing procedure.
1362 This also works if sym is an ENTRY. */
1365 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1367 gfc_symbol* proc_sym;
1368 gfc_symbol* context_proc;
1369 gfc_namespace* real_context;
1371 if (sym->attr.flavor == FL_PROGRAM)
1374 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1376 /* If we've got an ENTRY, find real procedure. */
1377 if (sym->attr.entry && sym->ns->entries)
1378 proc_sym = sym->ns->entries->sym;
1382 /* If sym is RECURSIVE, all is well of course. */
1383 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1386 /* Find the context procedure's "real" symbol if it has entries.
1387 We look for a procedure symbol, so recurse on the parents if we don't
1388 find one (like in case of a BLOCK construct). */
1389 for (real_context = context; ; real_context = real_context->parent)
1391 /* We should find something, eventually! */
1392 gcc_assert (real_context);
1394 context_proc = (real_context->entries ? real_context->entries->sym
1395 : real_context->proc_name);
1397 /* In some special cases, there may not be a proc_name, like for this
1399 real(bad_kind()) function foo () ...
1400 when checking the call to bad_kind ().
1401 In these cases, we simply return here and assume that the
1406 if (context_proc->attr.flavor != FL_LABEL)
1410 /* A call from sym's body to itself is recursion, of course. */
1411 if (context_proc == proc_sym)
1414 /* The same is true if context is a contained procedure and sym the
1416 if (context_proc->attr.contained)
1418 gfc_symbol* parent_proc;
1420 gcc_assert (context->parent);
1421 parent_proc = (context->parent->entries ? context->parent->entries->sym
1422 : context->parent->proc_name);
1424 if (parent_proc == proc_sym)
1432 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1433 its typespec and formal argument list. */
1436 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1438 gfc_intrinsic_sym* isym = NULL;
1444 /* Already resolved. */
1445 if (sym->from_intmod && sym->ts.type != BT_UNKNOWN)
1448 /* We already know this one is an intrinsic, so we don't call
1449 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1450 gfc_find_subroutine directly to check whether it is a function or
1453 if (sym->intmod_sym_id)
1454 isym = gfc_intrinsic_function_by_id ((gfc_isym_id) sym->intmod_sym_id);
1456 isym = gfc_find_function (sym->name);
1460 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1461 && !sym->attr.implicit_type)
1462 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1463 " ignored", sym->name, &sym->declared_at);
1465 if (!sym->attr.function &&
1466 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1471 else if ((isym = gfc_find_subroutine (sym->name)))
1473 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1475 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1476 " specifier", sym->name, &sym->declared_at);
1480 if (!sym->attr.subroutine &&
1481 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1486 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1491 gfc_copy_formal_args_intr (sym, isym);
1493 /* Check it is actually available in the standard settings. */
1494 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1497 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1498 " available in the current standard settings but %s. Use"
1499 " an appropriate -std=* option or enable -fall-intrinsics"
1500 " in order to use it.",
1501 sym->name, &sym->declared_at, symstd);
1509 /* Resolve a procedure expression, like passing it to a called procedure or as
1510 RHS for a procedure pointer assignment. */
1513 resolve_procedure_expression (gfc_expr* expr)
1517 if (expr->expr_type != EXPR_VARIABLE)
1519 gcc_assert (expr->symtree);
1521 sym = expr->symtree->n.sym;
1523 if (sym->attr.intrinsic)
1524 resolve_intrinsic (sym, &expr->where);
1526 if (sym->attr.flavor != FL_PROCEDURE
1527 || (sym->attr.function && sym->result == sym))
1530 /* A non-RECURSIVE procedure that is used as procedure expression within its
1531 own body is in danger of being called recursively. */
1532 if (is_illegal_recursion (sym, gfc_current_ns))
1533 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1534 " itself recursively. Declare it RECURSIVE or use"
1535 " -frecursive", sym->name, &expr->where);
1541 /* Resolve an actual argument list. Most of the time, this is just
1542 resolving the expressions in the list.
1543 The exception is that we sometimes have to decide whether arguments
1544 that look like procedure arguments are really simple variable
1548 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1549 bool no_formal_args)
1552 gfc_symtree *parent_st;
1554 int save_need_full_assumed_size;
1556 for (; arg; arg = arg->next)
1561 /* Check the label is a valid branching target. */
1564 if (arg->label->defined == ST_LABEL_UNKNOWN)
1566 gfc_error ("Label %d referenced at %L is never defined",
1567 arg->label->value, &arg->label->where);
1574 if (e->expr_type == EXPR_VARIABLE
1575 && e->symtree->n.sym->attr.generic
1577 && count_specific_procs (e) != 1)
1580 if (e->ts.type != BT_PROCEDURE)
1582 save_need_full_assumed_size = need_full_assumed_size;
1583 if (e->expr_type != EXPR_VARIABLE)
1584 need_full_assumed_size = 0;
1585 if (gfc_resolve_expr (e) != SUCCESS)
1587 need_full_assumed_size = save_need_full_assumed_size;
1591 /* See if the expression node should really be a variable reference. */
1593 sym = e->symtree->n.sym;
1595 if (sym->attr.flavor == FL_PROCEDURE
1596 || sym->attr.intrinsic
1597 || sym->attr.external)
1601 /* If a procedure is not already determined to be something else
1602 check if it is intrinsic. */
1603 if (!sym->attr.intrinsic
1604 && !(sym->attr.external || sym->attr.use_assoc
1605 || sym->attr.if_source == IFSRC_IFBODY)
1606 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1607 sym->attr.intrinsic = 1;
1609 if (sym->attr.proc == PROC_ST_FUNCTION)
1611 gfc_error ("Statement function '%s' at %L is not allowed as an "
1612 "actual argument", sym->name, &e->where);
1615 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1616 sym->attr.subroutine);
1617 if (sym->attr.intrinsic && actual_ok == 0)
1619 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1620 "actual argument", sym->name, &e->where);
1623 if (sym->attr.contained && !sym->attr.use_assoc
1624 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1626 if (gfc_notify_std (GFC_STD_F2008,
1627 "Fortran 2008: Internal procedure '%s' is"
1628 " used as actual argument at %L",
1629 sym->name, &e->where) == FAILURE)
1633 if (sym->attr.elemental && !sym->attr.intrinsic)
1635 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1636 "allowed as an actual argument at %L", sym->name,
1640 /* Check if a generic interface has a specific procedure
1641 with the same name before emitting an error. */
1642 if (sym->attr.generic && count_specific_procs (e) != 1)
1645 /* Just in case a specific was found for the expression. */
1646 sym = e->symtree->n.sym;
1648 /* If the symbol is the function that names the current (or
1649 parent) scope, then we really have a variable reference. */
1651 if (gfc_is_function_return_value (sym, sym->ns))
1654 /* If all else fails, see if we have a specific intrinsic. */
1655 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1657 gfc_intrinsic_sym *isym;
1659 isym = gfc_find_function (sym->name);
1660 if (isym == NULL || !isym->specific)
1662 gfc_error ("Unable to find a specific INTRINSIC procedure "
1663 "for the reference '%s' at %L", sym->name,
1668 sym->attr.intrinsic = 1;
1669 sym->attr.function = 1;
1672 if (gfc_resolve_expr (e) == FAILURE)
1677 /* See if the name is a module procedure in a parent unit. */
1679 if (was_declared (sym) || sym->ns->parent == NULL)
1682 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1684 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1688 if (parent_st == NULL)
1691 sym = parent_st->n.sym;
1692 e->symtree = parent_st; /* Point to the right thing. */
1694 if (sym->attr.flavor == FL_PROCEDURE
1695 || sym->attr.intrinsic
1696 || sym->attr.external)
1698 if (gfc_resolve_expr (e) == FAILURE)
1704 e->expr_type = EXPR_VARIABLE;
1706 if (sym->as != NULL)
1708 e->rank = sym->as->rank;
1709 e->ref = gfc_get_ref ();
1710 e->ref->type = REF_ARRAY;
1711 e->ref->u.ar.type = AR_FULL;
1712 e->ref->u.ar.as = sym->as;
1715 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1716 primary.c (match_actual_arg). If above code determines that it
1717 is a variable instead, it needs to be resolved as it was not
1718 done at the beginning of this function. */
1719 save_need_full_assumed_size = need_full_assumed_size;
1720 if (e->expr_type != EXPR_VARIABLE)
1721 need_full_assumed_size = 0;
1722 if (gfc_resolve_expr (e) != SUCCESS)
1724 need_full_assumed_size = save_need_full_assumed_size;
1727 /* Check argument list functions %VAL, %LOC and %REF. There is
1728 nothing to do for %REF. */
1729 if (arg->name && arg->name[0] == '%')
1731 if (strncmp ("%VAL", arg->name, 4) == 0)
1733 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1735 gfc_error ("By-value argument at %L is not of numeric "
1742 gfc_error ("By-value argument at %L cannot be an array or "
1743 "an array section", &e->where);
1747 /* Intrinsics are still PROC_UNKNOWN here. However,
1748 since same file external procedures are not resolvable
1749 in gfortran, it is a good deal easier to leave them to
1751 if (ptype != PROC_UNKNOWN
1752 && ptype != PROC_DUMMY
1753 && ptype != PROC_EXTERNAL
1754 && ptype != PROC_MODULE)
1756 gfc_error ("By-value argument at %L is not allowed "
1757 "in this context", &e->where);
1762 /* Statement functions have already been excluded above. */
1763 else if (strncmp ("%LOC", arg->name, 4) == 0
1764 && e->ts.type == BT_PROCEDURE)
1766 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1768 gfc_error ("Passing internal procedure at %L by location "
1769 "not allowed", &e->where);
1775 /* Fortran 2008, C1237. */
1776 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1777 && gfc_has_ultimate_pointer (e))
1779 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1780 "component", &e->where);
1789 /* Do the checks of the actual argument list that are specific to elemental
1790 procedures. If called with c == NULL, we have a function, otherwise if
1791 expr == NULL, we have a subroutine. */
1794 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1796 gfc_actual_arglist *arg0;
1797 gfc_actual_arglist *arg;
1798 gfc_symbol *esym = NULL;
1799 gfc_intrinsic_sym *isym = NULL;
1801 gfc_intrinsic_arg *iformal = NULL;
1802 gfc_formal_arglist *eformal = NULL;
1803 bool formal_optional = false;
1804 bool set_by_optional = false;
1808 /* Is this an elemental procedure? */
1809 if (expr && expr->value.function.actual != NULL)
1811 if (expr->value.function.esym != NULL
1812 && expr->value.function.esym->attr.elemental)
1814 arg0 = expr->value.function.actual;
1815 esym = expr->value.function.esym;
1817 else if (expr->value.function.isym != NULL
1818 && expr->value.function.isym->elemental)
1820 arg0 = expr->value.function.actual;
1821 isym = expr->value.function.isym;
1826 else if (c && c->ext.actual != NULL)
1828 arg0 = c->ext.actual;
1830 if (c->resolved_sym)
1831 esym = c->resolved_sym;
1833 esym = c->symtree->n.sym;
1836 if (!esym->attr.elemental)
1842 /* The rank of an elemental is the rank of its array argument(s). */
1843 for (arg = arg0; arg; arg = arg->next)
1845 if (arg->expr != NULL && arg->expr->rank > 0)
1847 rank = arg->expr->rank;
1848 if (arg->expr->expr_type == EXPR_VARIABLE
1849 && arg->expr->symtree->n.sym->attr.optional)
1850 set_by_optional = true;
1852 /* Function specific; set the result rank and shape. */
1856 if (!expr->shape && arg->expr->shape)
1858 expr->shape = gfc_get_shape (rank);
1859 for (i = 0; i < rank; i++)
1860 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1867 /* If it is an array, it shall not be supplied as an actual argument
1868 to an elemental procedure unless an array of the same rank is supplied
1869 as an actual argument corresponding to a nonoptional dummy argument of
1870 that elemental procedure(12.4.1.5). */
1871 formal_optional = false;
1873 iformal = isym->formal;
1875 eformal = esym->formal;
1877 for (arg = arg0; arg; arg = arg->next)
1881 if (eformal->sym && eformal->sym->attr.optional)
1882 formal_optional = true;
1883 eformal = eformal->next;
1885 else if (isym && iformal)
1887 if (iformal->optional)
1888 formal_optional = true;
1889 iformal = iformal->next;
1892 formal_optional = true;
1894 if (pedantic && arg->expr != NULL
1895 && arg->expr->expr_type == EXPR_VARIABLE
1896 && arg->expr->symtree->n.sym->attr.optional
1899 && (set_by_optional || arg->expr->rank != rank)
1900 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1902 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1903 "MISSING, it cannot be the actual argument of an "
1904 "ELEMENTAL procedure unless there is a non-optional "
1905 "argument with the same rank (12.4.1.5)",
1906 arg->expr->symtree->n.sym->name, &arg->expr->where);
1911 for (arg = arg0; arg; arg = arg->next)
1913 if (arg->expr == NULL || arg->expr->rank == 0)
1916 /* Being elemental, the last upper bound of an assumed size array
1917 argument must be present. */
1918 if (resolve_assumed_size_actual (arg->expr))
1921 /* Elemental procedure's array actual arguments must conform. */
1924 if (gfc_check_conformance (arg->expr, e,
1925 "elemental procedure") == FAILURE)
1932 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1933 is an array, the intent inout/out variable needs to be also an array. */
1934 if (rank > 0 && esym && expr == NULL)
1935 for (eformal = esym->formal, arg = arg0; arg && eformal;
1936 arg = arg->next, eformal = eformal->next)
1937 if ((eformal->sym->attr.intent == INTENT_OUT
1938 || eformal->sym->attr.intent == INTENT_INOUT)
1939 && arg->expr && arg->expr->rank == 0)
1941 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1942 "ELEMENTAL subroutine '%s' is a scalar, but another "
1943 "actual argument is an array", &arg->expr->where,
1944 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1945 : "INOUT", eformal->sym->name, esym->name);
1952 /* This function does the checking of references to global procedures
1953 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1954 77 and 95 standards. It checks for a gsymbol for the name, making
1955 one if it does not already exist. If it already exists, then the
1956 reference being resolved must correspond to the type of gsymbol.
1957 Otherwise, the new symbol is equipped with the attributes of the
1958 reference. The corresponding code that is called in creating
1959 global entities is parse.c.
1961 In addition, for all but -std=legacy, the gsymbols are used to
1962 check the interfaces of external procedures from the same file.
1963 The namespace of the gsymbol is resolved and then, once this is
1964 done the interface is checked. */
1968 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1970 if (!gsym_ns->proc_name->attr.recursive)
1973 if (sym->ns == gsym_ns)
1976 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1983 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1985 if (gsym_ns->entries)
1987 gfc_entry_list *entry = gsym_ns->entries;
1989 for (; entry; entry = entry->next)
1991 if (strcmp (sym->name, entry->sym->name) == 0)
1993 if (strcmp (gsym_ns->proc_name->name,
1994 sym->ns->proc_name->name) == 0)
1998 && strcmp (gsym_ns->proc_name->name,
1999 sym->ns->parent->proc_name->name) == 0)
2008 resolve_global_procedure (gfc_symbol *sym, locus *where,
2009 gfc_actual_arglist **actual, int sub)
2013 enum gfc_symbol_type type;
2015 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
2017 gsym = gfc_get_gsymbol (sym->name);
2019 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
2020 gfc_global_used (gsym, where);
2022 if (gfc_option.flag_whole_file
2023 && (sym->attr.if_source == IFSRC_UNKNOWN
2024 || sym->attr.if_source == IFSRC_IFBODY)
2025 && gsym->type != GSYM_UNKNOWN
2027 && gsym->ns->resolved != -1
2028 && gsym->ns->proc_name
2029 && not_in_recursive (sym, gsym->ns)
2030 && not_entry_self_reference (sym, gsym->ns))
2032 gfc_symbol *def_sym;
2034 /* Resolve the gsymbol namespace if needed. */
2035 if (!gsym->ns->resolved)
2037 gfc_dt_list *old_dt_list;
2038 struct gfc_omp_saved_state old_omp_state;
2040 /* Stash away derived types so that the backend_decls do not
2042 old_dt_list = gfc_derived_types;
2043 gfc_derived_types = NULL;
2044 /* And stash away openmp state. */
2045 gfc_omp_save_and_clear_state (&old_omp_state);
2047 gfc_resolve (gsym->ns);
2049 /* Store the new derived types with the global namespace. */
2050 if (gfc_derived_types)
2051 gsym->ns->derived_types = gfc_derived_types;
2053 /* Restore the derived types of this namespace. */
2054 gfc_derived_types = old_dt_list;
2055 /* And openmp state. */
2056 gfc_omp_restore_state (&old_omp_state);
2059 /* Make sure that translation for the gsymbol occurs before
2060 the procedure currently being resolved. */
2061 ns = gfc_global_ns_list;
2062 for (; ns && ns != gsym->ns; ns = ns->sibling)
2064 if (ns->sibling == gsym->ns)
2066 ns->sibling = gsym->ns->sibling;
2067 gsym->ns->sibling = gfc_global_ns_list;
2068 gfc_global_ns_list = gsym->ns;
2073 def_sym = gsym->ns->proc_name;
2074 if (def_sym->attr.entry_master)
2076 gfc_entry_list *entry;
2077 for (entry = gsym->ns->entries; entry; entry = entry->next)
2078 if (strcmp (entry->sym->name, sym->name) == 0)
2080 def_sym = entry->sym;
2085 /* Differences in constant character lengths. */
2086 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
2088 long int l1 = 0, l2 = 0;
2089 gfc_charlen *cl1 = sym->ts.u.cl;
2090 gfc_charlen *cl2 = def_sym->ts.u.cl;
2093 && cl1->length != NULL
2094 && cl1->length->expr_type == EXPR_CONSTANT)
2095 l1 = mpz_get_si (cl1->length->value.integer);
2098 && cl2->length != NULL
2099 && cl2->length->expr_type == EXPR_CONSTANT)
2100 l2 = mpz_get_si (cl2->length->value.integer);
2102 if (l1 && l2 && l1 != l2)
2103 gfc_error ("Character length mismatch in return type of "
2104 "function '%s' at %L (%ld/%ld)", sym->name,
2105 &sym->declared_at, l1, l2);
2108 /* Type mismatch of function return type and expected type. */
2109 if (sym->attr.function
2110 && !gfc_compare_types (&sym->ts, &def_sym->ts))
2111 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
2112 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
2113 gfc_typename (&def_sym->ts));
2115 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
2117 gfc_formal_arglist *arg = def_sym->formal;
2118 for ( ; arg; arg = arg->next)
2121 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
2122 else if (arg->sym->attr.allocatable
2123 || arg->sym->attr.asynchronous
2124 || arg->sym->attr.optional
2125 || arg->sym->attr.pointer
2126 || arg->sym->attr.target
2127 || arg->sym->attr.value
2128 || arg->sym->attr.volatile_)
2130 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
2131 "has an attribute that requires an explicit "
2132 "interface for this procedure", arg->sym->name,
2133 sym->name, &sym->declared_at);
2136 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
2137 else if (arg->sym && arg->sym->as
2138 && arg->sym->as->type == AS_ASSUMED_SHAPE)
2140 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
2141 "argument '%s' must have an explicit interface",
2142 sym->name, &sym->declared_at, arg->sym->name);
2145 /* F2008, 12.4.2.2 (2c) */
2146 else if (arg->sym->attr.codimension)
2148 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
2149 "'%s' must have an explicit interface",
2150 sym->name, &sym->declared_at, arg->sym->name);
2153 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
2154 else if (false) /* TODO: is a parametrized derived type */
2156 gfc_error ("Procedure '%s' at %L with parametrized derived "
2157 "type argument '%s' must have an explicit "
2158 "interface", sym->name, &sym->declared_at,
2162 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
2163 else if (arg->sym->ts.type == BT_CLASS)
2165 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
2166 "argument '%s' must have an explicit interface",
2167 sym->name, &sym->declared_at, arg->sym->name);
2172 if (def_sym->attr.function)
2174 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
2175 if (def_sym->as && def_sym->as->rank
2176 && (!sym->as || sym->as->rank != def_sym->as->rank))
2177 gfc_error ("The reference to function '%s' at %L either needs an "
2178 "explicit INTERFACE or the rank is incorrect", sym->name,
2181 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
2182 if ((def_sym->result->attr.pointer
2183 || def_sym->result->attr.allocatable)
2184 && (sym->attr.if_source != IFSRC_IFBODY
2185 || def_sym->result->attr.pointer
2186 != sym->result->attr.pointer
2187 || def_sym->result->attr.allocatable
2188 != sym->result->attr.allocatable))
2189 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
2190 "result must have an explicit interface", sym->name,
2193 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
2194 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
2195 && def_sym->ts.type == BT_CHARACTER && def_sym->ts.u.cl->length != NULL)
2197 gfc_charlen *cl = sym->ts.u.cl;
2199 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
2200 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
2202 gfc_error ("Nonconstant character-length function '%s' at %L "
2203 "must have an explicit interface", sym->name,
2209 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2210 if (def_sym->attr.elemental && !sym->attr.elemental)
2212 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2213 "interface", sym->name, &sym->declared_at);
2216 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2217 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2219 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2220 "an explicit interface", sym->name, &sym->declared_at);
2223 if (gfc_option.flag_whole_file == 1
2224 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2225 && !(gfc_option.warn_std & GFC_STD_GNU)))
2226 gfc_errors_to_warnings (1);
2228 if (sym->attr.if_source != IFSRC_IFBODY)
2229 gfc_procedure_use (def_sym, actual, where);
2231 gfc_errors_to_warnings (0);
2234 if (gsym->type == GSYM_UNKNOWN)
2237 gsym->where = *where;
2244 /************* Function resolution *************/
2246 /* Resolve a function call known to be generic.
2247 Section 14.1.2.4.1. */
2250 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2254 if (sym->attr.generic)
2256 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2259 expr->value.function.name = s->name;
2260 expr->value.function.esym = s;
2262 if (s->ts.type != BT_UNKNOWN)
2264 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2265 expr->ts = s->result->ts;
2268 expr->rank = s->as->rank;
2269 else if (s->result != NULL && s->result->as != NULL)
2270 expr->rank = s->result->as->rank;
2272 gfc_set_sym_referenced (expr->value.function.esym);
2277 /* TODO: Need to search for elemental references in generic
2281 if (sym->attr.intrinsic)
2282 return gfc_intrinsic_func_interface (expr, 0);
2289 resolve_generic_f (gfc_expr *expr)
2294 sym = expr->symtree->n.sym;
2298 m = resolve_generic_f0 (expr, sym);
2301 else if (m == MATCH_ERROR)
2305 if (sym->ns->parent == NULL)
2307 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2311 if (!generic_sym (sym))
2315 /* Last ditch attempt. See if the reference is to an intrinsic
2316 that possesses a matching interface. 14.1.2.4 */
2317 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2319 gfc_error ("There is no specific function for the generic '%s' at %L",
2320 expr->symtree->n.sym->name, &expr->where);
2324 m = gfc_intrinsic_func_interface (expr, 0);
2328 gfc_error ("Generic function '%s' at %L is not consistent with a "
2329 "specific intrinsic interface", expr->symtree->n.sym->name,
2336 /* Resolve a function call known to be specific. */
2339 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2343 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2345 if (sym->attr.dummy)
2347 sym->attr.proc = PROC_DUMMY;
2351 sym->attr.proc = PROC_EXTERNAL;
2355 if (sym->attr.proc == PROC_MODULE
2356 || sym->attr.proc == PROC_ST_FUNCTION
2357 || sym->attr.proc == PROC_INTERNAL)
2360 if (sym->attr.intrinsic)
2362 m = gfc_intrinsic_func_interface (expr, 1);
2366 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2367 "with an intrinsic", sym->name, &expr->where);
2375 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2378 expr->ts = sym->result->ts;
2381 expr->value.function.name = sym->name;
2382 expr->value.function.esym = sym;
2383 if (sym->as != NULL)
2384 expr->rank = sym->as->rank;
2391 resolve_specific_f (gfc_expr *expr)
2396 sym = expr->symtree->n.sym;
2400 m = resolve_specific_f0 (sym, expr);
2403 if (m == MATCH_ERROR)
2406 if (sym->ns->parent == NULL)
2409 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2415 gfc_error ("Unable to resolve the specific function '%s' at %L",
2416 expr->symtree->n.sym->name, &expr->where);
2422 /* Resolve a procedure call not known to be generic nor specific. */
2425 resolve_unknown_f (gfc_expr *expr)
2430 sym = expr->symtree->n.sym;
2432 if (sym->attr.dummy)
2434 sym->attr.proc = PROC_DUMMY;
2435 expr->value.function.name = sym->name;
2439 /* See if we have an intrinsic function reference. */
2441 if (gfc_is_intrinsic (sym, 0, expr->where))
2443 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2448 /* The reference is to an external name. */
2450 sym->attr.proc = PROC_EXTERNAL;
2451 expr->value.function.name = sym->name;
2452 expr->value.function.esym = expr->symtree->n.sym;
2454 if (sym->as != NULL)
2455 expr->rank = sym->as->rank;
2457 /* Type of the expression is either the type of the symbol or the
2458 default type of the symbol. */
2461 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2463 if (sym->ts.type != BT_UNKNOWN)
2467 ts = gfc_get_default_type (sym->name, sym->ns);
2469 if (ts->type == BT_UNKNOWN)
2471 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2472 sym->name, &expr->where);
2483 /* Return true, if the symbol is an external procedure. */
2485 is_external_proc (gfc_symbol *sym)
2487 if (!sym->attr.dummy && !sym->attr.contained
2488 && !(sym->attr.intrinsic
2489 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2490 && sym->attr.proc != PROC_ST_FUNCTION
2491 && !sym->attr.proc_pointer
2492 && !sym->attr.use_assoc
2500 /* Figure out if a function reference is pure or not. Also set the name
2501 of the function for a potential error message. Return nonzero if the
2502 function is PURE, zero if not. */
2504 pure_stmt_function (gfc_expr *, gfc_symbol *);
2507 pure_function (gfc_expr *e, const char **name)
2513 if (e->symtree != NULL
2514 && e->symtree->n.sym != NULL
2515 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2516 return pure_stmt_function (e, e->symtree->n.sym);
2518 if (e->value.function.esym)
2520 pure = gfc_pure (e->value.function.esym);
2521 *name = e->value.function.esym->name;
2523 else if (e->value.function.isym)
2525 pure = e->value.function.isym->pure
2526 || e->value.function.isym->elemental;
2527 *name = e->value.function.isym->name;
2531 /* Implicit functions are not pure. */
2533 *name = e->value.function.name;
2541 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2542 int *f ATTRIBUTE_UNUSED)
2546 /* Don't bother recursing into other statement functions
2547 since they will be checked individually for purity. */
2548 if (e->expr_type != EXPR_FUNCTION
2550 || e->symtree->n.sym == sym
2551 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2554 return pure_function (e, &name) ? false : true;
2559 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2561 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2566 is_scalar_expr_ptr (gfc_expr *expr)
2568 gfc_try retval = SUCCESS;
2573 /* See if we have a gfc_ref, which means we have a substring, array
2574 reference, or a component. */
2575 if (expr->ref != NULL)
2578 while (ref->next != NULL)
2584 if (ref->u.ss.start == NULL || ref->u.ss.end == NULL
2585 || gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) != 0)
2590 if (ref->u.ar.type == AR_ELEMENT)
2592 else if (ref->u.ar.type == AR_FULL)
2594 /* The user can give a full array if the array is of size 1. */
2595 if (ref->u.ar.as != NULL
2596 && ref->u.ar.as->rank == 1
2597 && ref->u.ar.as->type == AS_EXPLICIT
2598 && ref->u.ar.as->lower[0] != NULL
2599 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2600 && ref->u.ar.as->upper[0] != NULL
2601 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2603 /* If we have a character string, we need to check if
2604 its length is one. */
2605 if (expr->ts.type == BT_CHARACTER)
2607 if (expr->ts.u.cl == NULL
2608 || expr->ts.u.cl->length == NULL
2609 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2615 /* We have constant lower and upper bounds. If the
2616 difference between is 1, it can be considered a
2618 FIXME: Use gfc_dep_compare_expr instead. */
2619 start = (int) mpz_get_si
2620 (ref->u.ar.as->lower[0]->value.integer);
2621 end = (int) mpz_get_si
2622 (ref->u.ar.as->upper[0]->value.integer);
2623 if (end - start + 1 != 1)
2638 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2640 /* Character string. Make sure it's of length 1. */
2641 if (expr->ts.u.cl == NULL
2642 || expr->ts.u.cl->length == NULL
2643 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2646 else if (expr->rank != 0)
2653 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2654 and, in the case of c_associated, set the binding label based on
2658 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2659 gfc_symbol **new_sym)
2661 char name[GFC_MAX_SYMBOL_LEN + 1];
2662 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2663 int optional_arg = 0;
2664 gfc_try retval = SUCCESS;
2665 gfc_symbol *args_sym;
2666 gfc_typespec *arg_ts;
2667 symbol_attribute arg_attr;
2669 if (args->expr->expr_type == EXPR_CONSTANT
2670 || args->expr->expr_type == EXPR_OP
2671 || args->expr->expr_type == EXPR_NULL)
2673 gfc_error ("Argument to '%s' at %L is not a variable",
2674 sym->name, &(args->expr->where));
2678 args_sym = args->expr->symtree->n.sym;
2680 /* The typespec for the actual arg should be that stored in the expr
2681 and not necessarily that of the expr symbol (args_sym), because
2682 the actual expression could be a part-ref of the expr symbol. */
2683 arg_ts = &(args->expr->ts);
2684 arg_attr = gfc_expr_attr (args->expr);
2686 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2688 /* If the user gave two args then they are providing something for
2689 the optional arg (the second cptr). Therefore, set the name and
2690 binding label to the c_associated for two cptrs. Otherwise,
2691 set c_associated to expect one cptr. */
2695 sprintf (name, "%s_2", sym->name);
2696 sprintf (binding_label, "%s_2", sym->binding_label);
2702 sprintf (name, "%s_1", sym->name);
2703 sprintf (binding_label, "%s_1", sym->binding_label);
2707 /* Get a new symbol for the version of c_associated that
2709 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2711 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2712 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2714 sprintf (name, "%s", sym->name);
2715 sprintf (binding_label, "%s", sym->binding_label);
2717 /* Error check the call. */
2718 if (args->next != NULL)
2720 gfc_error_now ("More actual than formal arguments in '%s' "
2721 "call at %L", name, &(args->expr->where));
2724 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2729 /* Make sure we have either the target or pointer attribute. */
2730 if (!arg_attr.target && !arg_attr.pointer)
2732 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2733 "a TARGET or an associated pointer",
2735 sym->name, &(args->expr->where));
2739 if (gfc_is_coindexed (args->expr))
2741 gfc_error_now ("Coindexed argument not permitted"
2742 " in '%s' call at %L", name,
2743 &(args->expr->where));
2747 /* Follow references to make sure there are no array
2749 seen_section = false;
2751 for (ref=args->expr->ref; ref; ref = ref->next)
2753 if (ref->type == REF_ARRAY)
2755 if (ref->u.ar.type == AR_SECTION)
2756 seen_section = true;
2758 if (ref->u.ar.type != AR_ELEMENT)
2761 for (r = ref->next; r; r=r->next)
2762 if (r->type == REF_COMPONENT)
2764 gfc_error_now ("Array section not permitted"
2765 " in '%s' call at %L", name,
2766 &(args->expr->where));
2774 if (seen_section && retval == SUCCESS)
2775 gfc_warning ("Array section in '%s' call at %L", name,
2776 &(args->expr->where));
2778 /* See if we have interoperable type and type param. */
2779 if (verify_c_interop (arg_ts) == SUCCESS
2780 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2782 if (args_sym->attr.target == 1)
2784 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2785 has the target attribute and is interoperable. */
2786 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2787 allocatable variable that has the TARGET attribute and
2788 is not an array of zero size. */
2789 if (args_sym->attr.allocatable == 1)
2791 if (args_sym->attr.dimension != 0
2792 && (args_sym->as && args_sym->as->rank == 0))
2794 gfc_error_now ("Allocatable variable '%s' used as a "
2795 "parameter to '%s' at %L must not be "
2796 "an array of zero size",
2797 args_sym->name, sym->name,
2798 &(args->expr->where));
2804 /* A non-allocatable target variable with C
2805 interoperable type and type parameters must be
2807 if (args_sym && args_sym->attr.dimension)
2809 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2811 gfc_error ("Assumed-shape array '%s' at %L "
2812 "cannot be an argument to the "
2813 "procedure '%s' because "
2814 "it is not C interoperable",
2816 &(args->expr->where), sym->name);
2819 else if (args_sym->as->type == AS_DEFERRED)
2821 gfc_error ("Deferred-shape array '%s' at %L "
2822 "cannot be an argument to the "
2823 "procedure '%s' because "
2824 "it is not C interoperable",
2826 &(args->expr->where), sym->name);
2831 /* Make sure it's not a character string. Arrays of
2832 any type should be ok if the variable is of a C
2833 interoperable type. */
2834 if (arg_ts->type == BT_CHARACTER)
2835 if (arg_ts->u.cl != NULL
2836 && (arg_ts->u.cl->length == NULL
2837 || arg_ts->u.cl->length->expr_type
2840 (arg_ts->u.cl->length->value.integer, 1)
2842 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2844 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2845 "at %L must have a length of 1",
2846 args_sym->name, sym->name,
2847 &(args->expr->where));
2852 else if (arg_attr.pointer
2853 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2855 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2857 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2858 "associated scalar POINTER", args_sym->name,
2859 sym->name, &(args->expr->where));
2865 /* The parameter is not required to be C interoperable. If it
2866 is not C interoperable, it must be a nonpolymorphic scalar
2867 with no length type parameters. It still must have either
2868 the pointer or target attribute, and it can be
2869 allocatable (but must be allocated when c_loc is called). */
2870 if (args->expr->rank != 0
2871 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2873 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2874 "scalar", args_sym->name, sym->name,
2875 &(args->expr->where));
2878 else if (arg_ts->type == BT_CHARACTER
2879 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2881 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2882 "%L must have a length of 1",
2883 args_sym->name, sym->name,
2884 &(args->expr->where));
2887 else if (arg_ts->type == BT_CLASS)
2889 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2890 "polymorphic", args_sym->name, sym->name,
2891 &(args->expr->where));
2896 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2898 if (args_sym->attr.flavor != FL_PROCEDURE)
2900 /* TODO: Update this error message to allow for procedure
2901 pointers once they are implemented. */
2902 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2904 args_sym->name, sym->name,
2905 &(args->expr->where));
2908 else if (args_sym->attr.is_bind_c != 1)
2910 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2912 args_sym->name, sym->name,
2913 &(args->expr->where));
2918 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2923 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2924 "iso_c_binding function: '%s'!\n", sym->name);
2931 /* Resolve a function call, which means resolving the arguments, then figuring
2932 out which entity the name refers to. */
2935 resolve_function (gfc_expr *expr)
2937 gfc_actual_arglist *arg;
2942 procedure_type p = PROC_INTRINSIC;
2943 bool no_formal_args;
2947 sym = expr->symtree->n.sym;
2949 /* If this is a procedure pointer component, it has already been resolved. */
2950 if (gfc_is_proc_ptr_comp (expr, NULL))
2953 if (sym && sym->attr.intrinsic
2954 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2957 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2959 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2963 /* If this ia a deferred TBP with an abstract interface (which may
2964 of course be referenced), expr->value.function.esym will be set. */
2965 if (sym && sym->attr.abstract && !expr->value.function.esym)
2967 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2968 sym->name, &expr->where);
2972 /* Switch off assumed size checking and do this again for certain kinds
2973 of procedure, once the procedure itself is resolved. */
2974 need_full_assumed_size++;
2976 if (expr->symtree && expr->symtree->n.sym)
2977 p = expr->symtree->n.sym->attr.proc;
2979 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2980 inquiry_argument = true;
2981 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2983 if (resolve_actual_arglist (expr->value.function.actual,
2984 p, no_formal_args) == FAILURE)
2986 inquiry_argument = false;
2990 inquiry_argument = false;
2992 /* Need to setup the call to the correct c_associated, depending on
2993 the number of cptrs to user gives to compare. */
2994 if (sym && sym->attr.is_iso_c == 1)
2996 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
3000 /* Get the symtree for the new symbol (resolved func).
3001 the old one will be freed later, when it's no longer used. */
3002 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
3005 /* Resume assumed_size checking. */
3006 need_full_assumed_size--;
3008 /* If the procedure is external, check for usage. */
3009 if (sym && is_external_proc (sym))
3010 resolve_global_procedure (sym, &expr->where,
3011 &expr->value.function.actual, 0);
3013 if (sym && sym->ts.type == BT_CHARACTER
3015 && sym->ts.u.cl->length == NULL
3017 && !sym->ts.deferred
3018 && expr->value.function.esym == NULL
3019 && !sym->attr.contained)
3021 /* Internal procedures are taken care of in resolve_contained_fntype. */
3022 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
3023 "be used at %L since it is not a dummy argument",
3024 sym->name, &expr->where);
3028 /* See if function is already resolved. */
3030 if (expr->value.function.name != NULL)
3032 if (expr->ts.type == BT_UNKNOWN)
3038 /* Apply the rules of section 14.1.2. */
3040 switch (procedure_kind (sym))
3043 t = resolve_generic_f (expr);
3046 case PTYPE_SPECIFIC:
3047 t = resolve_specific_f (expr);
3051 t = resolve_unknown_f (expr);
3055 gfc_internal_error ("resolve_function(): bad function type");
3059 /* If the expression is still a function (it might have simplified),
3060 then we check to see if we are calling an elemental function. */
3062 if (expr->expr_type != EXPR_FUNCTION)
3065 temp = need_full_assumed_size;
3066 need_full_assumed_size = 0;
3068 if (resolve_elemental_actual (expr, NULL) == FAILURE)
3071 if (omp_workshare_flag
3072 && expr->value.function.esym
3073 && ! gfc_elemental (expr->value.function.esym))
3075 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
3076 "in WORKSHARE construct", expr->value.function.esym->name,
3081 #define GENERIC_ID expr->value.function.isym->id
3082 else if (expr->value.function.actual != NULL
3083 && expr->value.function.isym != NULL
3084 && GENERIC_ID != GFC_ISYM_LBOUND
3085 && GENERIC_ID != GFC_ISYM_LEN
3086 && GENERIC_ID != GFC_ISYM_LOC
3087 && GENERIC_ID != GFC_ISYM_PRESENT)
3089 /* Array intrinsics must also have the last upper bound of an
3090 assumed size array argument. UBOUND and SIZE have to be
3091 excluded from the check if the second argument is anything
3094 for (arg = expr->value.function.actual; arg; arg = arg->next)
3096 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
3097 && arg->next != NULL && arg->next->expr)
3099 if (arg->next->expr->expr_type != EXPR_CONSTANT)
3102 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
3105 if ((int)mpz_get_si (arg->next->expr->value.integer)
3110 if (arg->expr != NULL
3111 && arg->expr->rank > 0
3112 && resolve_assumed_size_actual (arg->expr))
3118 need_full_assumed_size = temp;
3121 if (!pure_function (expr, &name) && name)
3125 gfc_error ("reference to non-PURE function '%s' at %L inside a "
3126 "FORALL %s", name, &expr->where,
3127 forall_flag == 2 ? "mask" : "block");
3130 else if (gfc_pure (NULL))
3132 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
3133 "procedure within a PURE procedure", name, &expr->where);
3138 if (!pure_function (expr, &name) && name && gfc_implicit_pure (NULL))
3139 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3141 /* Functions without the RECURSIVE attribution are not allowed to
3142 * call themselves. */
3143 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
3146 esym = expr->value.function.esym;
3148 if (is_illegal_recursion (esym, gfc_current_ns))
3150 if (esym->attr.entry && esym->ns->entries)
3151 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3152 " function '%s' is not RECURSIVE",
3153 esym->name, &expr->where, esym->ns->entries->sym->name);
3155 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
3156 " is not RECURSIVE", esym->name, &expr->where);
3162 /* Character lengths of use associated functions may contains references to
3163 symbols not referenced from the current program unit otherwise. Make sure
3164 those symbols are marked as referenced. */
3166 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
3167 && expr->value.function.esym->attr.use_assoc)
3169 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
3172 /* Make sure that the expression has a typespec that works. */
3173 if (expr->ts.type == BT_UNKNOWN)
3175 if (expr->symtree->n.sym->result
3176 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
3177 && !expr->symtree->n.sym->result->attr.proc_pointer)
3178 expr->ts = expr->symtree->n.sym->result->ts;
3185 /************* Subroutine resolution *************/
3188 pure_subroutine (gfc_code *c, gfc_symbol *sym)
3194 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
3195 sym->name, &c->loc);
3196 else if (gfc_pure (NULL))
3197 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
3203 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
3207 if (sym->attr.generic)
3209 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
3212 c->resolved_sym = s;
3213 pure_subroutine (c, s);
3217 /* TODO: Need to search for elemental references in generic interface. */
3220 if (sym->attr.intrinsic)
3221 return gfc_intrinsic_sub_interface (c, 0);
3228 resolve_generic_s (gfc_code *c)
3233 sym = c->symtree->n.sym;
3237 m = resolve_generic_s0 (c, sym);
3240 else if (m == MATCH_ERROR)
3244 if (sym->ns->parent == NULL)
3246 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3250 if (!generic_sym (sym))
3254 /* Last ditch attempt. See if the reference is to an intrinsic
3255 that possesses a matching interface. 14.1.2.4 */
3256 sym = c->symtree->n.sym;
3258 if (!gfc_is_intrinsic (sym, 1, c->loc))
3260 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3261 sym->name, &c->loc);
3265 m = gfc_intrinsic_sub_interface (c, 0);
3269 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3270 "intrinsic subroutine interface", sym->name, &c->loc);
3276 /* Set the name and binding label of the subroutine symbol in the call
3277 expression represented by 'c' to include the type and kind of the
3278 second parameter. This function is for resolving the appropriate
3279 version of c_f_pointer() and c_f_procpointer(). For example, a
3280 call to c_f_pointer() for a default integer pointer could have a
3281 name of c_f_pointer_i4. If no second arg exists, which is an error
3282 for these two functions, it defaults to the generic symbol's name
3283 and binding label. */
3286 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3287 char *name, char *binding_label)
3289 gfc_expr *arg = NULL;
3293 /* The second arg of c_f_pointer and c_f_procpointer determines
3294 the type and kind for the procedure name. */
3295 arg = c->ext.actual->next->expr;
3299 /* Set up the name to have the given symbol's name,
3300 plus the type and kind. */
3301 /* a derived type is marked with the type letter 'u' */
3302 if (arg->ts.type == BT_DERIVED)
3305 kind = 0; /* set the kind as 0 for now */
3309 type = gfc_type_letter (arg->ts.type);
3310 kind = arg->ts.kind;
3313 if (arg->ts.type == BT_CHARACTER)
3314 /* Kind info for character strings not needed. */
3317 sprintf (name, "%s_%c%d", sym->name, type, kind);
3318 /* Set up the binding label as the given symbol's label plus
3319 the type and kind. */
3320 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3324 /* If the second arg is missing, set the name and label as
3325 was, cause it should at least be found, and the missing
3326 arg error will be caught by compare_parameters(). */
3327 sprintf (name, "%s", sym->name);
3328 sprintf (binding_label, "%s", sym->binding_label);
3335 /* Resolve a generic version of the iso_c_binding procedure given
3336 (sym) to the specific one based on the type and kind of the
3337 argument(s). Currently, this function resolves c_f_pointer() and
3338 c_f_procpointer based on the type and kind of the second argument
3339 (FPTR). Other iso_c_binding procedures aren't specially handled.
3340 Upon successfully exiting, c->resolved_sym will hold the resolved
3341 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3345 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3347 gfc_symbol *new_sym;
3348 /* this is fine, since we know the names won't use the max */
3349 char name[GFC_MAX_SYMBOL_LEN + 1];
3350 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3351 /* default to success; will override if find error */
3352 match m = MATCH_YES;
3354 /* Make sure the actual arguments are in the necessary order (based on the
3355 formal args) before resolving. */
3356 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3358 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3359 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3361 set_name_and_label (c, sym, name, binding_label);
3363 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3365 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3367 /* Make sure we got a third arg if the second arg has non-zero
3368 rank. We must also check that the type and rank are
3369 correct since we short-circuit this check in
3370 gfc_procedure_use() (called above to sort actual args). */
3371 if (c->ext.actual->next->expr->rank != 0)
3373 if(c->ext.actual->next->next == NULL
3374 || c->ext.actual->next->next->expr == NULL)
3377 gfc_error ("Missing SHAPE parameter for call to %s "
3378 "at %L", sym->name, &(c->loc));
3380 else if (c->ext.actual->next->next->expr->ts.type
3382 || c->ext.actual->next->next->expr->rank != 1)
3385 gfc_error ("SHAPE parameter for call to %s at %L must "
3386 "be a rank 1 INTEGER array", sym->name,
3393 if (m != MATCH_ERROR)
3395 /* the 1 means to add the optional arg to formal list */
3396 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3398 /* for error reporting, say it's declared where the original was */
3399 new_sym->declared_at = sym->declared_at;
3404 /* no differences for c_loc or c_funloc */
3408 /* set the resolved symbol */
3409 if (m != MATCH_ERROR)
3410 c->resolved_sym = new_sym;
3412 c->resolved_sym = sym;
3418 /* Resolve a subroutine call known to be specific. */
3421 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3425 if(sym->attr.is_iso_c)
3427 m = gfc_iso_c_sub_interface (c,sym);
3431 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3433 if (sym->attr.dummy)
3435 sym->attr.proc = PROC_DUMMY;
3439 sym->attr.proc = PROC_EXTERNAL;
3443 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3446 if (sym->attr.intrinsic)
3448 m = gfc_intrinsic_sub_interface (c, 1);
3452 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3453 "with an intrinsic", sym->name, &c->loc);
3461 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3463 c->resolved_sym = sym;
3464 pure_subroutine (c, sym);
3471 resolve_specific_s (gfc_code *c)
3476 sym = c->symtree->n.sym;
3480 m = resolve_specific_s0 (c, sym);
3483 if (m == MATCH_ERROR)
3486 if (sym->ns->parent == NULL)
3489 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3495 sym = c->symtree->n.sym;
3496 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3497 sym->name, &c->loc);
3503 /* Resolve a subroutine call not known to be generic nor specific. */
3506 resolve_unknown_s (gfc_code *c)
3510 sym = c->symtree->n.sym;
3512 if (sym->attr.dummy)
3514 sym->attr.proc = PROC_DUMMY;
3518 /* See if we have an intrinsic function reference. */
3520 if (gfc_is_intrinsic (sym, 1, c->loc))
3522 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3527 /* The reference is to an external name. */
3530 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3532 c->resolved_sym = sym;
3534 pure_subroutine (c, sym);
3540 /* Resolve a subroutine call. Although it was tempting to use the same code
3541 for functions, subroutines and functions are stored differently and this
3542 makes things awkward. */
3545 resolve_call (gfc_code *c)
3548 procedure_type ptype = PROC_INTRINSIC;
3549 gfc_symbol *csym, *sym;
3550 bool no_formal_args;
3552 csym = c->symtree ? c->symtree->n.sym : NULL;
3554 if (csym && csym->ts.type != BT_UNKNOWN)
3556 gfc_error ("'%s' at %L has a type, which is not consistent with "
3557 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3561 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3564 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3565 sym = st ? st->n.sym : NULL;
3566 if (sym && csym != sym
3567 && sym->ns == gfc_current_ns
3568 && sym->attr.flavor == FL_PROCEDURE
3569 && sym->attr.contained)
3572 if (csym->attr.generic)
3573 c->symtree->n.sym = sym;
3576 csym = c->symtree->n.sym;
3580 /* If this ia a deferred TBP with an abstract interface
3581 (which may of course be referenced), c->expr1 will be set. */
3582 if (csym && csym->attr.abstract && !c->expr1)
3584 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3585 csym->name, &c->loc);
3589 /* Subroutines without the RECURSIVE attribution are not allowed to
3590 * call themselves. */
3591 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3593 if (csym->attr.entry && csym->ns->entries)
3594 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3595 " subroutine '%s' is not RECURSIVE",
3596 csym->name, &c->loc, csym->ns->entries->sym->name);
3598 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3599 " is not RECURSIVE", csym->name, &c->loc);
3604 /* Switch off assumed size checking and do this again for certain kinds
3605 of procedure, once the procedure itself is resolved. */
3606 need_full_assumed_size++;
3609 ptype = csym->attr.proc;
3611 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3612 if (resolve_actual_arglist (c->ext.actual, ptype,
3613 no_formal_args) == FAILURE)
3616 /* Resume assumed_size checking. */
3617 need_full_assumed_size--;
3619 /* If external, check for usage. */
3620 if (csym && is_external_proc (csym))
3621 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3624 if (c->resolved_sym == NULL)
3626 c->resolved_isym = NULL;
3627 switch (procedure_kind (csym))
3630 t = resolve_generic_s (c);
3633 case PTYPE_SPECIFIC:
3634 t = resolve_specific_s (c);
3638 t = resolve_unknown_s (c);
3642 gfc_internal_error ("resolve_subroutine(): bad function type");
3646 /* Some checks of elemental subroutine actual arguments. */
3647 if (resolve_elemental_actual (NULL, c) == FAILURE)
3654 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3655 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3656 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3657 if their shapes do not match. If either op1->shape or op2->shape is
3658 NULL, return SUCCESS. */
3661 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3668 if (op1->shape != NULL && op2->shape != NULL)
3670 for (i = 0; i < op1->rank; i++)
3672 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3674 gfc_error ("Shapes for operands at %L and %L are not conformable",
3675 &op1->where, &op2->where);
3686 /* Resolve an operator expression node. This can involve replacing the
3687 operation with a user defined function call. */
3690 resolve_operator (gfc_expr *e)
3692 gfc_expr *op1, *op2;
3694 bool dual_locus_error;
3697 /* Resolve all subnodes-- give them types. */
3699 switch (e->value.op.op)
3702 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3705 /* Fall through... */
3708 case INTRINSIC_UPLUS:
3709 case INTRINSIC_UMINUS:
3710 case INTRINSIC_PARENTHESES:
3711 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3716 /* Typecheck the new node. */
3718 op1 = e->value.op.op1;
3719 op2 = e->value.op.op2;
3720 dual_locus_error = false;
3722 if ((op1 && op1->expr_type == EXPR_NULL)
3723 || (op2 && op2->expr_type == EXPR_NULL))
3725 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3729 switch (e->value.op.op)
3731 case INTRINSIC_UPLUS:
3732 case INTRINSIC_UMINUS:
3733 if (op1->ts.type == BT_INTEGER
3734 || op1->ts.type == BT_REAL
3735 || op1->ts.type == BT_COMPLEX)
3741 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3742 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3745 case INTRINSIC_PLUS:
3746 case INTRINSIC_MINUS:
3747 case INTRINSIC_TIMES:
3748 case INTRINSIC_DIVIDE:
3749 case INTRINSIC_POWER:
3750 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3752 gfc_type_convert_binary (e, 1);
3757 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3758 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3759 gfc_typename (&op2->ts));
3762 case INTRINSIC_CONCAT:
3763 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3764 && op1->ts.kind == op2->ts.kind)
3766 e->ts.type = BT_CHARACTER;
3767 e->ts.kind = op1->ts.kind;
3772 _("Operands of string concatenation operator at %%L are %s/%s"),
3773 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3779 case INTRINSIC_NEQV:
3780 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3782 e->ts.type = BT_LOGICAL;
3783 e->ts.kind = gfc_kind_max (op1, op2);
3784 if (op1->ts.kind < e->ts.kind)
3785 gfc_convert_type (op1, &e->ts, 2);
3786 else if (op2->ts.kind < e->ts.kind)
3787 gfc_convert_type (op2, &e->ts, 2);
3791 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3792 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3793 gfc_typename (&op2->ts));
3798 if (op1->ts.type == BT_LOGICAL)
3800 e->ts.type = BT_LOGICAL;
3801 e->ts.kind = op1->ts.kind;
3805 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3806 gfc_typename (&op1->ts));
3810 case INTRINSIC_GT_OS:
3812 case INTRINSIC_GE_OS:
3814 case INTRINSIC_LT_OS:
3816 case INTRINSIC_LE_OS:
3817 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3819 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3823 /* Fall through... */
3826 case INTRINSIC_EQ_OS:
3828 case INTRINSIC_NE_OS:
3829 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3830 && op1->ts.kind == op2->ts.kind)
3832 e->ts.type = BT_LOGICAL;
3833 e->ts.kind = gfc_default_logical_kind;
3837 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3839 gfc_type_convert_binary (e, 1);
3841 e->ts.type = BT_LOGICAL;
3842 e->ts.kind = gfc_default_logical_kind;
3846 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3848 _("Logicals at %%L must be compared with %s instead of %s"),
3849 (e->value.op.op == INTRINSIC_EQ
3850 || e->value.op.op == INTRINSIC_EQ_OS)
3851 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3854 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3855 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3856 gfc_typename (&op2->ts));
3860 case INTRINSIC_USER:
3861 if (e->value.op.uop->op == NULL)
3862 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3863 else if (op2 == NULL)
3864 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3865 e->value.op.uop->name, gfc_typename (&op1->ts));
3868 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3869 e->value.op.uop->name, gfc_typename (&op1->ts),
3870 gfc_typename (&op2->ts));
3871 e->value.op.uop->op->sym->attr.referenced = 1;
3876 case INTRINSIC_PARENTHESES:
3878 if (e->ts.type == BT_CHARACTER)
3879 e->ts.u.cl = op1->ts.u.cl;
3883 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3886 /* Deal with arrayness of an operand through an operator. */
3890 switch (e->value.op.op)
3892 case INTRINSIC_PLUS:
3893 case INTRINSIC_MINUS:
3894 case INTRINSIC_TIMES:
3895 case INTRINSIC_DIVIDE:
3896 case INTRINSIC_POWER:
3897 case INTRINSIC_CONCAT:
3901 case INTRINSIC_NEQV:
3903 case INTRINSIC_EQ_OS:
3905 case INTRINSIC_NE_OS:
3907 case INTRINSIC_GT_OS:
3909 case INTRINSIC_GE_OS:
3911 case INTRINSIC_LT_OS:
3913 case INTRINSIC_LE_OS:
3915 if (op1->rank == 0 && op2->rank == 0)
3918 if (op1->rank == 0 && op2->rank != 0)
3920 e->rank = op2->rank;
3922 if (e->shape == NULL)
3923 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3926 if (op1->rank != 0 && op2->rank == 0)
3928 e->rank = op1->rank;
3930 if (e->shape == NULL)
3931 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3934 if (op1->rank != 0 && op2->rank != 0)
3936 if (op1->rank == op2->rank)
3938 e->rank = op1->rank;
3939 if (e->shape == NULL)
3941 t = compare_shapes (op1, op2);
3945 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3950 /* Allow higher level expressions to work. */
3953 /* Try user-defined operators, and otherwise throw an error. */
3954 dual_locus_error = true;
3956 _("Inconsistent ranks for operator at %%L and %%L"));
3963 case INTRINSIC_PARENTHESES:
3965 case INTRINSIC_UPLUS:
3966 case INTRINSIC_UMINUS:
3967 /* Simply copy arrayness attribute */
3968 e->rank = op1->rank;
3970 if (e->shape == NULL)
3971 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3979 /* Attempt to simplify the expression. */
3982 t = gfc_simplify_expr (e, 0);
3983 /* Some calls do not succeed in simplification and return FAILURE
3984 even though there is no error; e.g. variable references to
3985 PARAMETER arrays. */
3986 if (!gfc_is_constant_expr (e))
3995 if (gfc_extend_expr (e, &real_error) == SUCCESS)
4002 if (dual_locus_error)
4003 gfc_error (msg, &op1->where, &op2->where);
4005 gfc_error (msg, &e->where);
4011 /************** Array resolution subroutines **************/
4014 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
4017 /* Compare two integer expressions. */
4020 compare_bound (gfc_expr *a, gfc_expr *b)
4024 if (a == NULL || a->expr_type != EXPR_CONSTANT
4025 || b == NULL || b->expr_type != EXPR_CONSTANT)
4028 /* If either of the types isn't INTEGER, we must have
4029 raised an error earlier. */
4031 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
4034 i = mpz_cmp (a->value.integer, b->value.integer);
4044 /* Compare an integer expression with an integer. */
4047 compare_bound_int (gfc_expr *a, int b)
4051 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4054 if (a->ts.type != BT_INTEGER)
4055 gfc_internal_error ("compare_bound_int(): Bad expression");
4057 i = mpz_cmp_si (a->value.integer, b);
4067 /* Compare an integer expression with a mpz_t. */
4070 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
4074 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4077 if (a->ts.type != BT_INTEGER)
4078 gfc_internal_error ("compare_bound_int(): Bad expression");
4080 i = mpz_cmp (a->value.integer, b);
4090 /* Compute the last value of a sequence given by a triplet.
4091 Return 0 if it wasn't able to compute the last value, or if the
4092 sequence if empty, and 1 otherwise. */
4095 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
4096 gfc_expr *stride, mpz_t last)
4100 if (start == NULL || start->expr_type != EXPR_CONSTANT
4101 || end == NULL || end->expr_type != EXPR_CONSTANT
4102 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
4105 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
4106 || (stride != NULL && stride->ts.type != BT_INTEGER))
4109 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
4111 if (compare_bound (start, end) == CMP_GT)
4113 mpz_set (last, end->value.integer);
4117 if (compare_bound_int (stride, 0) == CMP_GT)
4119 /* Stride is positive */
4120 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
4125 /* Stride is negative */
4126 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
4131 mpz_sub (rem, end->value.integer, start->value.integer);
4132 mpz_tdiv_r (rem, rem, stride->value.integer);
4133 mpz_sub (last, end->value.integer, rem);
4140 /* Compare a single dimension of an array reference to the array
4144 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
4148 if (ar->dimen_type[i] == DIMEN_STAR)
4150 gcc_assert (ar->stride[i] == NULL);
4151 /* This implies [*] as [*:] and [*:3] are not possible. */
4152 if (ar->start[i] == NULL)
4154 gcc_assert (ar->end[i] == NULL);
4159 /* Given start, end and stride values, calculate the minimum and
4160 maximum referenced indexes. */
4162 switch (ar->dimen_type[i])
4165 case DIMEN_THIS_IMAGE:
4170 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
4173 gfc_warning ("Array reference at %L is out of bounds "
4174 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4175 mpz_get_si (ar->start[i]->value.integer),
4176 mpz_get_si (as->lower[i]->value.integer), i+1);
4178 gfc_warning ("Array reference at %L is out of bounds "
4179 "(%ld < %ld) in codimension %d", &ar->c_where[i],
4180 mpz_get_si (ar->start[i]->value.integer),
4181 mpz_get_si (as->lower[i]->value.integer),
4185 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
4188 gfc_warning ("Array reference at %L is out of bounds "
4189 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4190 mpz_get_si (ar->start[i]->value.integer),
4191 mpz_get_si (as->upper[i]->value.integer), i+1);
4193 gfc_warning ("Array reference at %L is out of bounds "
4194 "(%ld > %ld) in codimension %d", &ar->c_where[i],
4195 mpz_get_si (ar->start[i]->value.integer),
4196 mpz_get_si (as->upper[i]->value.integer),
4205 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
4206 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
4208 comparison comp_start_end = compare_bound (AR_START, AR_END);
4210 /* Check for zero stride, which is not allowed. */
4211 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
4213 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
4217 /* if start == len || (stride > 0 && start < len)
4218 || (stride < 0 && start > len),
4219 then the array section contains at least one element. In this
4220 case, there is an out-of-bounds access if
4221 (start < lower || start > upper). */
4222 if (compare_bound (AR_START, AR_END) == CMP_EQ
4223 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
4224 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
4225 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
4226 && comp_start_end == CMP_GT))
4228 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
4230 gfc_warning ("Lower array reference at %L is out of bounds "
4231 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4232 mpz_get_si (AR_START->value.integer),
4233 mpz_get_si (as->lower[i]->value.integer), i+1);
4236 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4238 gfc_warning ("Lower array reference at %L is out of bounds "
4239 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4240 mpz_get_si (AR_START->value.integer),
4241 mpz_get_si (as->upper[i]->value.integer), i+1);
4246 /* If we can compute the highest index of the array section,
4247 then it also has to be between lower and upper. */
4248 mpz_init (last_value);
4249 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4252 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4254 gfc_warning ("Upper array reference at %L is out of bounds "
4255 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4256 mpz_get_si (last_value),
4257 mpz_get_si (as->lower[i]->value.integer), i+1);
4258 mpz_clear (last_value);
4261 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4263 gfc_warning ("Upper array reference at %L is out of bounds "
4264 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4265 mpz_get_si (last_value),
4266 mpz_get_si (as->upper[i]->value.integer), i+1);
4267 mpz_clear (last_value);
4271 mpz_clear (last_value);
4279 gfc_internal_error ("check_dimension(): Bad array reference");
4286 /* Compare an array reference with an array specification. */
4289 compare_spec_to_ref (gfc_array_ref *ar)
4296 /* TODO: Full array sections are only allowed as actual parameters. */
4297 if (as->type == AS_ASSUMED_SIZE
4298 && (/*ar->type == AR_FULL
4299 ||*/ (ar->type == AR_SECTION
4300 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4302 gfc_error ("Rightmost upper bound of assumed size array section "
4303 "not specified at %L", &ar->where);
4307 if (ar->type == AR_FULL)
4310 if (as->rank != ar->dimen)
4312 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4313 &ar->where, ar->dimen, as->rank);
4317 /* ar->codimen == 0 is a local array. */
4318 if (as->corank != ar->codimen && ar->codimen != 0)
4320 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4321 &ar->where, ar->codimen, as->corank);
4325 for (i = 0; i < as->rank; i++)
4326 if (check_dimension (i, ar, as) == FAILURE)
4329 /* Local access has no coarray spec. */
4330 if (ar->codimen != 0)
4331 for (i = as->rank; i < as->rank + as->corank; i++)
4333 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate
4334 && ar->dimen_type[i] != DIMEN_THIS_IMAGE)
4336 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4337 i + 1 - as->rank, &ar->where);
4340 if (check_dimension (i, ar, as) == FAILURE)
4344 if (as->corank && ar->codimen == 0)
4347 ar->codimen = as->corank;
4348 for (n = ar->dimen; n < ar->dimen + ar->codimen; n++)
4349 ar->dimen_type[n] = DIMEN_THIS_IMAGE;
4356 /* Resolve one part of an array index. */
4359 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4360 int force_index_integer_kind)
4367 if (gfc_resolve_expr (index) == FAILURE)
4370 if (check_scalar && index->rank != 0)
4372 gfc_error ("Array index at %L must be scalar", &index->where);
4376 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4378 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4379 &index->where, gfc_basic_typename (index->ts.type));
4383 if (index->ts.type == BT_REAL)
4384 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4385 &index->where) == FAILURE)
4388 if ((index->ts.kind != gfc_index_integer_kind
4389 && force_index_integer_kind)
4390 || index->ts.type != BT_INTEGER)
4393 ts.type = BT_INTEGER;
4394 ts.kind = gfc_index_integer_kind;
4396 gfc_convert_type_warn (index, &ts, 2, 0);
4402 /* Resolve one part of an array index. */
4405 gfc_resolve_index (gfc_expr *index, int check_scalar)
4407 return gfc_resolve_index_1 (index, check_scalar, 1);
4410 /* Resolve a dim argument to an intrinsic function. */
4413 gfc_resolve_dim_arg (gfc_expr *dim)
4418 if (gfc_resolve_expr (dim) == FAILURE)
4423 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4428 if (dim->ts.type != BT_INTEGER)
4430 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4434 if (dim->ts.kind != gfc_index_integer_kind)
4439 ts.type = BT_INTEGER;
4440 ts.kind = gfc_index_integer_kind;
4442 gfc_convert_type_warn (dim, &ts, 2, 0);
4448 /* Given an expression that contains array references, update those array
4449 references to point to the right array specifications. While this is
4450 filled in during matching, this information is difficult to save and load
4451 in a module, so we take care of it here.
4453 The idea here is that the original array reference comes from the
4454 base symbol. We traverse the list of reference structures, setting
4455 the stored reference to references. Component references can
4456 provide an additional array specification. */
4459 find_array_spec (gfc_expr *e)
4463 gfc_symbol *derived;
4466 if (e->symtree->n.sym->ts.type == BT_CLASS)
4467 as = CLASS_DATA (e->symtree->n.sym)->as;
4469 as = e->symtree->n.sym->as;
4472 for (ref = e->ref; ref; ref = ref->next)
4477 gfc_internal_error ("find_array_spec(): Missing spec");
4484 if (derived == NULL)
4485 derived = e->symtree->n.sym->ts.u.derived;
4487 if (derived->attr.is_class)
4488 derived = derived->components->ts.u.derived;
4490 c = derived->components;
4492 for (; c; c = c->next)
4493 if (c == ref->u.c.component)
4495 /* Track the sequence of component references. */
4496 if (c->ts.type == BT_DERIVED)
4497 derived = c->ts.u.derived;
4502 gfc_internal_error ("find_array_spec(): Component not found");
4504 if (c->attr.dimension)
4507 gfc_internal_error ("find_array_spec(): unused as(1)");
4518 gfc_internal_error ("find_array_spec(): unused as(2)");
4522 /* Resolve an array reference. */
4525 resolve_array_ref (gfc_array_ref *ar)
4527 int i, check_scalar;
4530 for (i = 0; i < ar->dimen + ar->codimen; i++)
4532 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4534 /* Do not force gfc_index_integer_kind for the start. We can
4535 do fine with any integer kind. This avoids temporary arrays
4536 created for indexing with a vector. */
4537 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4539 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4541 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4546 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4550 ar->dimen_type[i] = DIMEN_ELEMENT;
4554 ar->dimen_type[i] = DIMEN_VECTOR;
4555 if (e->expr_type == EXPR_VARIABLE
4556 && e->symtree->n.sym->ts.type == BT_DERIVED)
4557 ar->start[i] = gfc_get_parentheses (e);
4561 gfc_error ("Array index at %L is an array of rank %d",
4562 &ar->c_where[i], e->rank);
4566 /* Fill in the upper bound, which may be lower than the
4567 specified one for something like a(2:10:5), which is
4568 identical to a(2:7:5). Only relevant for strides not equal
4570 if (ar->dimen_type[i] == DIMEN_RANGE
4571 && ar->stride[i] != NULL && ar->stride[i]->expr_type == EXPR_CONSTANT
4572 && mpz_cmp_si (ar->stride[i]->value.integer, 1L) != 0)
4576 if (gfc_ref_dimen_size (ar, i, &size, &end) == SUCCESS)
4578 if (ar->end[i] == NULL)
4581 gfc_get_constant_expr (BT_INTEGER, gfc_index_integer_kind,
4583 mpz_set (ar->end[i]->value.integer, end);
4585 else if (ar->end[i]->ts.type == BT_INTEGER
4586 && ar->end[i]->expr_type == EXPR_CONSTANT)
4588 mpz_set (ar->end[i]->value.integer, end);
4599 if (ar->type == AR_FULL && ar->as->rank == 0)
4600 ar->type = AR_ELEMENT;
4602 /* If the reference type is unknown, figure out what kind it is. */
4604 if (ar->type == AR_UNKNOWN)
4606 ar->type = AR_ELEMENT;
4607 for (i = 0; i < ar->dimen; i++)
4608 if (ar->dimen_type[i] == DIMEN_RANGE
4609 || ar->dimen_type[i] == DIMEN_VECTOR)
4611 ar->type = AR_SECTION;
4616 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4624 resolve_substring (gfc_ref *ref)
4626 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4628 if (ref->u.ss.start != NULL)
4630 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4633 if (ref->u.ss.start->ts.type != BT_INTEGER)
4635 gfc_error ("Substring start index at %L must be of type INTEGER",
4636 &ref->u.ss.start->where);
4640 if (ref->u.ss.start->rank != 0)
4642 gfc_error ("Substring start index at %L must be scalar",
4643 &ref->u.ss.start->where);
4647 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4648 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4649 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4651 gfc_error ("Substring start index at %L is less than one",
4652 &ref->u.ss.start->where);
4657 if (ref->u.ss.end != NULL)
4659 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4662 if (ref->u.ss.end->ts.type != BT_INTEGER)
4664 gfc_error ("Substring end index at %L must be of type INTEGER",
4665 &ref->u.ss.end->where);
4669 if (ref->u.ss.end->rank != 0)
4671 gfc_error ("Substring end index at %L must be scalar",
4672 &ref->u.ss.end->where);
4676 if (ref->u.ss.length != NULL
4677 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4678 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4679 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4681 gfc_error ("Substring end index at %L exceeds the string length",
4682 &ref->u.ss.start->where);
4686 if (compare_bound_mpz_t (ref->u.ss.end,
4687 gfc_integer_kinds[k].huge) == CMP_GT
4688 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4689 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4691 gfc_error ("Substring end index at %L is too large",
4692 &ref->u.ss.end->where);
4701 /* This function supplies missing substring charlens. */
4704 gfc_resolve_substring_charlen (gfc_expr *e)
4707 gfc_expr *start, *end;
4709 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4710 if (char_ref->type == REF_SUBSTRING)
4716 gcc_assert (char_ref->next == NULL);
4720 if (e->ts.u.cl->length)
4721 gfc_free_expr (e->ts.u.cl->length);
4722 else if (e->expr_type == EXPR_VARIABLE
4723 && e->symtree->n.sym->attr.dummy)
4727 e->ts.type = BT_CHARACTER;
4728 e->ts.kind = gfc_default_character_kind;
4731 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4733 if (char_ref->u.ss.start)
4734 start = gfc_copy_expr (char_ref->u.ss.start);
4736 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4738 if (char_ref->u.ss.end)
4739 end = gfc_copy_expr (char_ref->u.ss.end);
4740 else if (e->expr_type == EXPR_VARIABLE)
4741 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4748 /* Length = (end - start +1). */
4749 e->ts.u.cl->length = gfc_subtract (end, start);
4750 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4751 gfc_get_int_expr (gfc_default_integer_kind,
4754 e->ts.u.cl->length->ts.type = BT_INTEGER;
4755 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4757 /* Make sure that the length is simplified. */
4758 gfc_simplify_expr (e->ts.u.cl->length, 1);
4759 gfc_resolve_expr (e->ts.u.cl->length);
4763 /* Resolve subtype references. */
4766 resolve_ref (gfc_expr *expr)
4768 int current_part_dimension, n_components, seen_part_dimension;
4771 for (ref = expr->ref; ref; ref = ref->next)
4772 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4774 find_array_spec (expr);
4778 for (ref = expr->ref; ref; ref = ref->next)
4782 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4790 resolve_substring (ref);
4794 /* Check constraints on part references. */
4796 current_part_dimension = 0;
4797 seen_part_dimension = 0;
4800 for (ref = expr->ref; ref; ref = ref->next)
4805 switch (ref->u.ar.type)
4808 /* Coarray scalar. */
4809 if (ref->u.ar.as->rank == 0)
4811 current_part_dimension = 0;
4816 current_part_dimension = 1;
4820 current_part_dimension = 0;
4824 gfc_internal_error ("resolve_ref(): Bad array reference");
4830 if (current_part_dimension || seen_part_dimension)
4833 if (ref->u.c.component->attr.pointer
4834 || ref->u.c.component->attr.proc_pointer)
4836 gfc_error ("Component to the right of a part reference "
4837 "with nonzero rank must not have the POINTER "
4838 "attribute at %L", &expr->where);
4841 else if (ref->u.c.component->attr.allocatable)
4843 gfc_error ("Component to the right of a part reference "
4844 "with nonzero rank must not have the ALLOCATABLE "
4845 "attribute at %L", &expr->where);
4857 if (((ref->type == REF_COMPONENT && n_components > 1)
4858 || ref->next == NULL)
4859 && current_part_dimension
4860 && seen_part_dimension)
4862 gfc_error ("Two or more part references with nonzero rank must "
4863 "not be specified at %L", &expr->where);
4867 if (ref->type == REF_COMPONENT)
4869 if (current_part_dimension)
4870 seen_part_dimension = 1;
4872 /* reset to make sure */
4873 current_part_dimension = 0;
4881 /* Given an expression, determine its shape. This is easier than it sounds.
4882 Leaves the shape array NULL if it is not possible to determine the shape. */
4885 expression_shape (gfc_expr *e)
4887 mpz_t array[GFC_MAX_DIMENSIONS];
4890 if (e->rank == 0 || e->shape != NULL)
4893 for (i = 0; i < e->rank; i++)
4894 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4897 e->shape = gfc_get_shape (e->rank);
4899 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4904 for (i--; i >= 0; i--)
4905 mpz_clear (array[i]);
4909 /* Given a variable expression node, compute the rank of the expression by
4910 examining the base symbol and any reference structures it may have. */
4913 expression_rank (gfc_expr *e)
4918 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4919 could lead to serious confusion... */
4920 gcc_assert (e->expr_type != EXPR_COMPCALL);
4924 if (e->expr_type == EXPR_ARRAY)
4926 /* Constructors can have a rank different from one via RESHAPE(). */
4928 if (e->symtree == NULL)
4934 e->rank = (e->symtree->n.sym->as == NULL)
4935 ? 0 : e->symtree->n.sym->as->rank;
4941 for (ref = e->ref; ref; ref = ref->next)
4943 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.proc_pointer
4944 && ref->u.c.component->attr.function && !ref->next)
4945 rank = ref->u.c.component->as ? ref->u.c.component->as->rank : 0;
4947 if (ref->type != REF_ARRAY)
4950 if (ref->u.ar.type == AR_FULL)
4952 rank = ref->u.ar.as->rank;
4956 if (ref->u.ar.type == AR_SECTION)
4958 /* Figure out the rank of the section. */
4960 gfc_internal_error ("expression_rank(): Two array specs");
4962 for (i = 0; i < ref->u.ar.dimen; i++)
4963 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4964 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4974 expression_shape (e);
4978 /* Resolve a variable expression. */
4981 resolve_variable (gfc_expr *e)
4988 if (e->symtree == NULL)
4990 sym = e->symtree->n.sym;
4992 /* If this is an associate-name, it may be parsed with an array reference
4993 in error even though the target is scalar. Fail directly in this case. */
4994 if (sym->assoc && !sym->attr.dimension && e->ref && e->ref->type == REF_ARRAY)
4997 /* On the other hand, the parser may not have known this is an array;
4998 in this case, we have to add a FULL reference. */
4999 if (sym->assoc && sym->attr.dimension && !e->ref)
5001 e->ref = gfc_get_ref ();
5002 e->ref->type = REF_ARRAY;
5003 e->ref->u.ar.type = AR_FULL;
5004 e->ref->u.ar.dimen = 0;
5007 if (e->ref && resolve_ref (e) == FAILURE)
5010 if (sym->attr.flavor == FL_PROCEDURE
5011 && (!sym->attr.function
5012 || (sym->attr.function && sym->result
5013 && sym->result->attr.proc_pointer
5014 && !sym->result->attr.function)))
5016 e->ts.type = BT_PROCEDURE;
5017 goto resolve_procedure;
5020 if (sym->ts.type != BT_UNKNOWN)
5021 gfc_variable_attr (e, &e->ts);
5024 /* Must be a simple variable reference. */
5025 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
5030 if (check_assumed_size_reference (sym, e))
5033 /* Deal with forward references to entries during resolve_code, to
5034 satisfy, at least partially, 12.5.2.5. */
5035 if (gfc_current_ns->entries
5036 && current_entry_id == sym->entry_id
5039 && cs_base->current->op != EXEC_ENTRY)
5041 gfc_entry_list *entry;
5042 gfc_formal_arglist *formal;
5046 /* If the symbol is a dummy... */
5047 if (sym->attr.dummy && sym->ns == gfc_current_ns)
5049 entry = gfc_current_ns->entries;
5052 /* ...test if the symbol is a parameter of previous entries. */
5053 for (; entry && entry->id <= current_entry_id; entry = entry->next)
5054 for (formal = entry->sym->formal; formal; formal = formal->next)
5056 if (formal->sym && sym->name == formal->sym->name)
5060 /* If it has not been seen as a dummy, this is an error. */
5063 if (specification_expr)
5064 gfc_error ("Variable '%s', used in a specification expression"
5065 ", is referenced at %L before the ENTRY statement "
5066 "in which it is a parameter",
5067 sym->name, &cs_base->current->loc);
5069 gfc_error ("Variable '%s' is used at %L before the ENTRY "
5070 "statement in which it is a parameter",
5071 sym->name, &cs_base->current->loc);
5076 /* Now do the same check on the specification expressions. */
5077 specification_expr = 1;
5078 if (sym->ts.type == BT_CHARACTER
5079 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
5083 for (n = 0; n < sym->as->rank; n++)
5085 specification_expr = 1;
5086 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
5088 specification_expr = 1;
5089 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
5092 specification_expr = 0;
5095 /* Update the symbol's entry level. */
5096 sym->entry_id = current_entry_id + 1;
5099 /* If a symbol has been host_associated mark it. This is used latter,
5100 to identify if aliasing is possible via host association. */
5101 if (sym->attr.flavor == FL_VARIABLE
5102 && gfc_current_ns->parent
5103 && (gfc_current_ns->parent == sym->ns
5104 || (gfc_current_ns->parent->parent
5105 && gfc_current_ns->parent->parent == sym->ns)))
5106 sym->attr.host_assoc = 1;
5109 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
5112 /* F2008, C617 and C1229. */
5113 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
5114 && gfc_is_coindexed (e))
5116 gfc_ref *ref, *ref2 = NULL;
5118 for (ref = e->ref; ref; ref = ref->next)
5120 if (ref->type == REF_COMPONENT)
5122 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
5126 for ( ; ref; ref = ref->next)
5127 if (ref->type == REF_COMPONENT)
5130 /* Expression itself is not coindexed object. */
5131 if (ref && e->ts.type == BT_CLASS)
5133 gfc_error ("Polymorphic subobject of coindexed object at %L",
5138 /* Expression itself is coindexed object. */
5142 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
5143 for ( ; c; c = c->next)
5144 if (c->attr.allocatable && c->ts.type == BT_CLASS)
5146 gfc_error ("Coindexed object with polymorphic allocatable "
5147 "subcomponent at %L", &e->where);
5158 /* Checks to see that the correct symbol has been host associated.
5159 The only situation where this arises is that in which a twice
5160 contained function is parsed after the host association is made.
5161 Therefore, on detecting this, change the symbol in the expression
5162 and convert the array reference into an actual arglist if the old
5163 symbol is a variable. */
5165 check_host_association (gfc_expr *e)
5167 gfc_symbol *sym, *old_sym;
5171 gfc_actual_arglist *arg, *tail = NULL;
5172 bool retval = e->expr_type == EXPR_FUNCTION;
5174 /* If the expression is the result of substitution in
5175 interface.c(gfc_extend_expr) because there is no way in
5176 which the host association can be wrong. */
5177 if (e->symtree == NULL
5178 || e->symtree->n.sym == NULL
5179 || e->user_operator)
5182 old_sym = e->symtree->n.sym;
5184 if (gfc_current_ns->parent
5185 && old_sym->ns != gfc_current_ns)
5187 /* Use the 'USE' name so that renamed module symbols are
5188 correctly handled. */
5189 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
5191 if (sym && old_sym != sym
5192 && sym->ts.type == old_sym->ts.type
5193 && sym->attr.flavor == FL_PROCEDURE
5194 && sym->attr.contained)
5196 /* Clear the shape, since it might not be valid. */
5197 if (e->shape != NULL)
5199 for (n = 0; n < e->rank; n++)
5200 mpz_clear (e->shape[n]);
5205 /* Give the expression the right symtree! */
5206 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
5207 gcc_assert (st != NULL);
5209 if (old_sym->attr.flavor == FL_PROCEDURE
5210 || e->expr_type == EXPR_FUNCTION)
5212 /* Original was function so point to the new symbol, since
5213 the actual argument list is already attached to the
5215 e->value.function.esym = NULL;
5220 /* Original was variable so convert array references into
5221 an actual arglist. This does not need any checking now
5222 since gfc_resolve_function will take care of it. */
5223 e->value.function.actual = NULL;
5224 e->expr_type = EXPR_FUNCTION;
5227 /* Ambiguity will not arise if the array reference is not
5228 the last reference. */
5229 for (ref = e->ref; ref; ref = ref->next)
5230 if (ref->type == REF_ARRAY && ref->next == NULL)
5233 gcc_assert (ref->type == REF_ARRAY);
5235 /* Grab the start expressions from the array ref and
5236 copy them into actual arguments. */
5237 for (n = 0; n < ref->u.ar.dimen; n++)
5239 arg = gfc_get_actual_arglist ();
5240 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
5241 if (e->value.function.actual == NULL)
5242 tail = e->value.function.actual = arg;
5250 /* Dump the reference list and set the rank. */
5251 gfc_free_ref_list (e->ref);
5253 e->rank = sym->as ? sym->as->rank : 0;
5256 gfc_resolve_expr (e);
5260 /* This might have changed! */
5261 return e->expr_type == EXPR_FUNCTION;
5266 gfc_resolve_character_operator (gfc_expr *e)
5268 gfc_expr *op1 = e->value.op.op1;
5269 gfc_expr *op2 = e->value.op.op2;
5270 gfc_expr *e1 = NULL;
5271 gfc_expr *e2 = NULL;
5273 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
5275 if (op1->ts.u.cl && op1->ts.u.cl->length)
5276 e1 = gfc_copy_expr (op1->ts.u.cl->length);
5277 else if (op1->expr_type == EXPR_CONSTANT)
5278 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5279 op1->value.character.length);
5281 if (op2->ts.u.cl && op2->ts.u.cl->length)
5282 e2 = gfc_copy_expr (op2->ts.u.cl->length);
5283 else if (op2->expr_type == EXPR_CONSTANT)
5284 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5285 op2->value.character.length);
5287 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5292 e->ts.u.cl->length = gfc_add (e1, e2);
5293 e->ts.u.cl->length->ts.type = BT_INTEGER;
5294 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
5295 gfc_simplify_expr (e->ts.u.cl->length, 0);
5296 gfc_resolve_expr (e->ts.u.cl->length);
5302 /* Ensure that an character expression has a charlen and, if possible, a
5303 length expression. */
5306 fixup_charlen (gfc_expr *e)
5308 /* The cases fall through so that changes in expression type and the need
5309 for multiple fixes are picked up. In all circumstances, a charlen should
5310 be available for the middle end to hang a backend_decl on. */
5311 switch (e->expr_type)
5314 gfc_resolve_character_operator (e);
5317 if (e->expr_type == EXPR_ARRAY)
5318 gfc_resolve_character_array_constructor (e);
5320 case EXPR_SUBSTRING:
5321 if (!e->ts.u.cl && e->ref)
5322 gfc_resolve_substring_charlen (e);
5326 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5333 /* Update an actual argument to include the passed-object for type-bound
5334 procedures at the right position. */
5336 static gfc_actual_arglist*
5337 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5340 gcc_assert (argpos > 0);
5344 gfc_actual_arglist* result;
5346 result = gfc_get_actual_arglist ();
5350 result->name = name;
5356 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5358 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5363 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5366 extract_compcall_passed_object (gfc_expr* e)
5370 gcc_assert (e->expr_type == EXPR_COMPCALL);
5372 if (e->value.compcall.base_object)
5373 po = gfc_copy_expr (e->value.compcall.base_object);
5376 po = gfc_get_expr ();
5377 po->expr_type = EXPR_VARIABLE;
5378 po->symtree = e->symtree;
5379 po->ref = gfc_copy_ref (e->ref);
5380 po->where = e->where;
5383 if (gfc_resolve_expr (po) == FAILURE)
5390 /* Update the arglist of an EXPR_COMPCALL expression to include the
5394 update_compcall_arglist (gfc_expr* e)
5397 gfc_typebound_proc* tbp;
5399 tbp = e->value.compcall.tbp;
5404 po = extract_compcall_passed_object (e);
5408 if (tbp->nopass || e->value.compcall.ignore_pass)
5414 gcc_assert (tbp->pass_arg_num > 0);
5415 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5423 /* Extract the passed object from a PPC call (a copy of it). */
5426 extract_ppc_passed_object (gfc_expr *e)
5431 po = gfc_get_expr ();
5432 po->expr_type = EXPR_VARIABLE;
5433 po->symtree = e->symtree;
5434 po->ref = gfc_copy_ref (e->ref);
5435 po->where = e->where;
5437 /* Remove PPC reference. */
5439 while ((*ref)->next)
5440 ref = &(*ref)->next;
5441 gfc_free_ref_list (*ref);
5444 if (gfc_resolve_expr (po) == FAILURE)
5451 /* Update the actual arglist of a procedure pointer component to include the
5455 update_ppc_arglist (gfc_expr* e)
5459 gfc_typebound_proc* tb;
5461 if (!gfc_is_proc_ptr_comp (e, &ppc))
5468 else if (tb->nopass)
5471 po = extract_ppc_passed_object (e);
5478 gfc_error ("Passed-object at %L must be scalar", &e->where);
5483 if (po->ts.type == BT_DERIVED && po->ts.u.derived->attr.abstract)
5485 gfc_error ("Base object for procedure-pointer component call at %L is of"
5486 " ABSTRACT type '%s'", &e->where, po->ts.u.derived->name);
5490 gcc_assert (tb->pass_arg_num > 0);
5491 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5499 /* Check that the object a TBP is called on is valid, i.e. it must not be
5500 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5503 check_typebound_baseobject (gfc_expr* e)
5506 gfc_try return_value = FAILURE;
5508 base = extract_compcall_passed_object (e);
5512 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5515 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5517 gfc_error ("Base object for type-bound procedure call at %L is of"
5518 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5522 /* F08:C1230. If the procedure called is NOPASS,
5523 the base object must be scalar. */
5524 if (e->value.compcall.tbp->nopass && base->rank > 0)
5526 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5527 " be scalar", &e->where);
5531 /* FIXME: Remove once PR 43214 is fixed (TBP with non-scalar PASS). */
5534 gfc_error ("Non-scalar base object at %L currently not implemented",
5539 return_value = SUCCESS;
5542 gfc_free_expr (base);
5543 return return_value;
5547 /* Resolve a call to a type-bound procedure, either function or subroutine,
5548 statically from the data in an EXPR_COMPCALL expression. The adapted
5549 arglist and the target-procedure symtree are returned. */
5552 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5553 gfc_actual_arglist** actual)
5555 gcc_assert (e->expr_type == EXPR_COMPCALL);
5556 gcc_assert (!e->value.compcall.tbp->is_generic);
5558 /* Update the actual arglist for PASS. */
5559 if (update_compcall_arglist (e) == FAILURE)
5562 *actual = e->value.compcall.actual;
5563 *target = e->value.compcall.tbp->u.specific;
5565 gfc_free_ref_list (e->ref);
5567 e->value.compcall.actual = NULL;
5573 /* Get the ultimate declared type from an expression. In addition,
5574 return the last class/derived type reference and the copy of the
5577 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5580 gfc_symbol *declared;
5587 *new_ref = gfc_copy_ref (e->ref);
5589 for (ref = e->ref; ref; ref = ref->next)
5591 if (ref->type != REF_COMPONENT)
5594 if (ref->u.c.component->ts.type == BT_CLASS
5595 || ref->u.c.component->ts.type == BT_DERIVED)
5597 declared = ref->u.c.component->ts.u.derived;
5603 if (declared == NULL)
5604 declared = e->symtree->n.sym->ts.u.derived;
5610 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5611 which of the specific bindings (if any) matches the arglist and transform
5612 the expression into a call of that binding. */
5615 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5617 gfc_typebound_proc* genproc;
5618 const char* genname;
5620 gfc_symbol *derived;
5622 gcc_assert (e->expr_type == EXPR_COMPCALL);
5623 genname = e->value.compcall.name;
5624 genproc = e->value.compcall.tbp;
5626 if (!genproc->is_generic)
5629 /* Try the bindings on this type and in the inheritance hierarchy. */
5630 for (; genproc; genproc = genproc->overridden)
5634 gcc_assert (genproc->is_generic);
5635 for (g = genproc->u.generic; g; g = g->next)
5638 gfc_actual_arglist* args;
5641 gcc_assert (g->specific);
5643 if (g->specific->error)
5646 target = g->specific->u.specific->n.sym;
5648 /* Get the right arglist by handling PASS/NOPASS. */
5649 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5650 if (!g->specific->nopass)
5653 po = extract_compcall_passed_object (e);
5657 gcc_assert (g->specific->pass_arg_num > 0);
5658 gcc_assert (!g->specific->error);
5659 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5660 g->specific->pass_arg);
5662 resolve_actual_arglist (args, target->attr.proc,
5663 is_external_proc (target) && !target->formal);
5665 /* Check if this arglist matches the formal. */
5666 matches = gfc_arglist_matches_symbol (&args, target);
5668 /* Clean up and break out of the loop if we've found it. */
5669 gfc_free_actual_arglist (args);
5672 e->value.compcall.tbp = g->specific;
5673 genname = g->specific_st->name;
5674 /* Pass along the name for CLASS methods, where the vtab
5675 procedure pointer component has to be referenced. */
5683 /* Nothing matching found! */
5684 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5685 " '%s' at %L", genname, &e->where);
5689 /* Make sure that we have the right specific instance for the name. */
5690 derived = get_declared_from_expr (NULL, NULL, e);
5692 st = gfc_find_typebound_proc (derived, NULL, genname, true, &e->where);
5694 e->value.compcall.tbp = st->n.tb;
5700 /* Resolve a call to a type-bound subroutine. */
5703 resolve_typebound_call (gfc_code* c, const char **name)
5705 gfc_actual_arglist* newactual;
5706 gfc_symtree* target;
5708 /* Check that's really a SUBROUTINE. */
5709 if (!c->expr1->value.compcall.tbp->subroutine)
5711 gfc_error ("'%s' at %L should be a SUBROUTINE",
5712 c->expr1->value.compcall.name, &c->loc);
5716 if (check_typebound_baseobject (c->expr1) == FAILURE)
5719 /* Pass along the name for CLASS methods, where the vtab
5720 procedure pointer component has to be referenced. */
5722 *name = c->expr1->value.compcall.name;
5724 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5727 /* Transform into an ordinary EXEC_CALL for now. */
5729 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5732 c->ext.actual = newactual;
5733 c->symtree = target;
5734 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5736 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5738 gfc_free_expr (c->expr1);
5739 c->expr1 = gfc_get_expr ();
5740 c->expr1->expr_type = EXPR_FUNCTION;
5741 c->expr1->symtree = target;
5742 c->expr1->where = c->loc;
5744 return resolve_call (c);
5748 /* Resolve a component-call expression. */
5750 resolve_compcall (gfc_expr* e, const char **name)
5752 gfc_actual_arglist* newactual;
5753 gfc_symtree* target;
5755 /* Check that's really a FUNCTION. */
5756 if (!e->value.compcall.tbp->function)
5758 gfc_error ("'%s' at %L should be a FUNCTION",
5759 e->value.compcall.name, &e->where);
5763 /* These must not be assign-calls! */
5764 gcc_assert (!e->value.compcall.assign);
5766 if (check_typebound_baseobject (e) == FAILURE)
5769 /* Pass along the name for CLASS methods, where the vtab
5770 procedure pointer component has to be referenced. */
5772 *name = e->value.compcall.name;
5774 if (resolve_typebound_generic_call (e, name) == FAILURE)
5776 gcc_assert (!e->value.compcall.tbp->is_generic);
5778 /* Take the rank from the function's symbol. */
5779 if (e->value.compcall.tbp->u.specific->n.sym->as)
5780 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5782 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5783 arglist to the TBP's binding target. */
5785 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5788 e->value.function.actual = newactual;
5789 e->value.function.name = NULL;
5790 e->value.function.esym = target->n.sym;
5791 e->value.function.isym = NULL;
5792 e->symtree = target;
5793 e->ts = target->n.sym->ts;
5794 e->expr_type = EXPR_FUNCTION;
5796 /* Resolution is not necessary if this is a class subroutine; this
5797 function only has to identify the specific proc. Resolution of
5798 the call will be done next in resolve_typebound_call. */
5799 return gfc_resolve_expr (e);
5804 /* Resolve a typebound function, or 'method'. First separate all
5805 the non-CLASS references by calling resolve_compcall directly. */
5808 resolve_typebound_function (gfc_expr* e)
5810 gfc_symbol *declared;
5821 /* Deal with typebound operators for CLASS objects. */
5822 expr = e->value.compcall.base_object;
5823 if (expr && expr->ts.type == BT_CLASS && e->value.compcall.name)
5825 /* Since the typebound operators are generic, we have to ensure
5826 that any delays in resolution are corrected and that the vtab
5829 declared = ts.u.derived;
5830 c = gfc_find_component (declared, "_vptr", true, true);
5831 if (c->ts.u.derived == NULL)
5832 c->ts.u.derived = gfc_find_derived_vtab (declared);
5834 if (resolve_compcall (e, &name) == FAILURE)
5837 /* Use the generic name if it is there. */
5838 name = name ? name : e->value.function.esym->name;
5839 e->symtree = expr->symtree;
5840 e->ref = gfc_copy_ref (expr->ref);
5841 gfc_add_vptr_component (e);
5842 gfc_add_component_ref (e, name);
5843 e->value.function.esym = NULL;
5848 return resolve_compcall (e, NULL);
5850 if (resolve_ref (e) == FAILURE)
5853 /* Get the CLASS declared type. */
5854 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5856 /* Weed out cases of the ultimate component being a derived type. */
5857 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5858 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5860 gfc_free_ref_list (new_ref);
5861 return resolve_compcall (e, NULL);
5864 c = gfc_find_component (declared, "_data", true, true);
5865 declared = c->ts.u.derived;
5867 /* Treat the call as if it is a typebound procedure, in order to roll
5868 out the correct name for the specific function. */
5869 if (resolve_compcall (e, &name) == FAILURE)
5873 /* Then convert the expression to a procedure pointer component call. */
5874 e->value.function.esym = NULL;
5880 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5881 gfc_add_vptr_component (e);
5882 gfc_add_component_ref (e, name);
5884 /* Recover the typespec for the expression. This is really only
5885 necessary for generic procedures, where the additional call
5886 to gfc_add_component_ref seems to throw the collection of the
5887 correct typespec. */
5892 /* Resolve a typebound subroutine, or 'method'. First separate all
5893 the non-CLASS references by calling resolve_typebound_call
5897 resolve_typebound_subroutine (gfc_code *code)
5899 gfc_symbol *declared;
5908 st = code->expr1->symtree;
5910 /* Deal with typebound operators for CLASS objects. */
5911 expr = code->expr1->value.compcall.base_object;
5912 if (expr && expr->ts.type == BT_CLASS && code->expr1->value.compcall.name)
5914 /* Since the typebound operators are generic, we have to ensure
5915 that any delays in resolution are corrected and that the vtab
5917 declared = expr->ts.u.derived;
5918 c = gfc_find_component (declared, "_vptr", true, true);
5919 if (c->ts.u.derived == NULL)
5920 c->ts.u.derived = gfc_find_derived_vtab (declared);
5922 if (resolve_typebound_call (code, &name) == FAILURE)
5925 /* Use the generic name if it is there. */
5926 name = name ? name : code->expr1->value.function.esym->name;
5927 code->expr1->symtree = expr->symtree;
5928 code->expr1->ref = gfc_copy_ref (expr->ref);
5929 gfc_add_vptr_component (code->expr1);
5930 gfc_add_component_ref (code->expr1, name);
5931 code->expr1->value.function.esym = NULL;
5936 return resolve_typebound_call (code, NULL);
5938 if (resolve_ref (code->expr1) == FAILURE)
5941 /* Get the CLASS declared type. */
5942 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5944 /* Weed out cases of the ultimate component being a derived type. */
5945 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5946 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5948 gfc_free_ref_list (new_ref);
5949 return resolve_typebound_call (code, NULL);
5952 if (resolve_typebound_call (code, &name) == FAILURE)
5954 ts = code->expr1->ts;
5956 /* Then convert the expression to a procedure pointer component call. */
5957 code->expr1->value.function.esym = NULL;
5958 code->expr1->symtree = st;
5961 code->expr1->ref = new_ref;
5963 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5964 gfc_add_vptr_component (code->expr1);
5965 gfc_add_component_ref (code->expr1, name);
5967 /* Recover the typespec for the expression. This is really only
5968 necessary for generic procedures, where the additional call
5969 to gfc_add_component_ref seems to throw the collection of the
5970 correct typespec. */
5971 code->expr1->ts = ts;
5976 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5979 resolve_ppc_call (gfc_code* c)
5981 gfc_component *comp;
5984 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5987 c->resolved_sym = c->expr1->symtree->n.sym;
5988 c->expr1->expr_type = EXPR_VARIABLE;
5990 if (!comp->attr.subroutine)
5991 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5993 if (resolve_ref (c->expr1) == FAILURE)
5996 if (update_ppc_arglist (c->expr1) == FAILURE)
5999 c->ext.actual = c->expr1->value.compcall.actual;
6001 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
6002 comp->formal == NULL) == FAILURE)
6005 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
6011 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
6014 resolve_expr_ppc (gfc_expr* e)
6016 gfc_component *comp;
6019 b = gfc_is_proc_ptr_comp (e, &comp);
6022 /* Convert to EXPR_FUNCTION. */
6023 e->expr_type = EXPR_FUNCTION;
6024 e->value.function.isym = NULL;
6025 e->value.function.actual = e->value.compcall.actual;
6027 if (comp->as != NULL)
6028 e->rank = comp->as->rank;
6030 if (!comp->attr.function)
6031 gfc_add_function (&comp->attr, comp->name, &e->where);
6033 if (resolve_ref (e) == FAILURE)
6036 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
6037 comp->formal == NULL) == FAILURE)
6040 if (update_ppc_arglist (e) == FAILURE)
6043 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
6050 gfc_is_expandable_expr (gfc_expr *e)
6052 gfc_constructor *con;
6054 if (e->expr_type == EXPR_ARRAY)
6056 /* Traverse the constructor looking for variables that are flavor
6057 parameter. Parameters must be expanded since they are fully used at
6059 con = gfc_constructor_first (e->value.constructor);
6060 for (; con; con = gfc_constructor_next (con))
6062 if (con->expr->expr_type == EXPR_VARIABLE
6063 && con->expr->symtree
6064 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
6065 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
6067 if (con->expr->expr_type == EXPR_ARRAY
6068 && gfc_is_expandable_expr (con->expr))
6076 /* Resolve an expression. That is, make sure that types of operands agree
6077 with their operators, intrinsic operators are converted to function calls
6078 for overloaded types and unresolved function references are resolved. */
6081 gfc_resolve_expr (gfc_expr *e)
6089 /* inquiry_argument only applies to variables. */
6090 inquiry_save = inquiry_argument;
6091 if (e->expr_type != EXPR_VARIABLE)
6092 inquiry_argument = false;
6094 switch (e->expr_type)
6097 t = resolve_operator (e);
6103 if (check_host_association (e))
6104 t = resolve_function (e);
6107 t = resolve_variable (e);
6109 expression_rank (e);
6112 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
6113 && e->ref->type != REF_SUBSTRING)
6114 gfc_resolve_substring_charlen (e);
6119 t = resolve_typebound_function (e);
6122 case EXPR_SUBSTRING:
6123 t = resolve_ref (e);
6132 t = resolve_expr_ppc (e);
6137 if (resolve_ref (e) == FAILURE)
6140 t = gfc_resolve_array_constructor (e);
6141 /* Also try to expand a constructor. */
6144 expression_rank (e);
6145 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
6146 gfc_expand_constructor (e, false);
6149 /* This provides the opportunity for the length of constructors with
6150 character valued function elements to propagate the string length
6151 to the expression. */
6152 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
6154 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
6155 here rather then add a duplicate test for it above. */
6156 gfc_expand_constructor (e, false);
6157 t = gfc_resolve_character_array_constructor (e);
6162 case EXPR_STRUCTURE:
6163 t = resolve_ref (e);
6167 t = resolve_structure_cons (e, 0);
6171 t = gfc_simplify_expr (e, 0);
6175 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
6178 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
6181 inquiry_argument = inquiry_save;
6187 /* Resolve an expression from an iterator. They must be scalar and have
6188 INTEGER or (optionally) REAL type. */
6191 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
6192 const char *name_msgid)
6194 if (gfc_resolve_expr (expr) == FAILURE)
6197 if (expr->rank != 0)
6199 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
6203 if (expr->ts.type != BT_INTEGER)
6205 if (expr->ts.type == BT_REAL)
6208 return gfc_notify_std (GFC_STD_F95_DEL,
6209 "Deleted feature: %s at %L must be integer",
6210 _(name_msgid), &expr->where);
6213 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
6220 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
6228 /* Resolve the expressions in an iterator structure. If REAL_OK is
6229 false allow only INTEGER type iterators, otherwise allow REAL types. */
6232 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
6234 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
6238 if (gfc_check_vardef_context (iter->var, false, _("iterator variable"))
6242 if (gfc_resolve_iterator_expr (iter->start, real_ok,
6243 "Start expression in DO loop") == FAILURE)
6246 if (gfc_resolve_iterator_expr (iter->end, real_ok,
6247 "End expression in DO loop") == FAILURE)
6250 if (gfc_resolve_iterator_expr (iter->step, real_ok,
6251 "Step expression in DO loop") == FAILURE)
6254 if (iter->step->expr_type == EXPR_CONSTANT)
6256 if ((iter->step->ts.type == BT_INTEGER
6257 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
6258 || (iter->step->ts.type == BT_REAL
6259 && mpfr_sgn (iter->step->value.real) == 0))
6261 gfc_error ("Step expression in DO loop at %L cannot be zero",
6262 &iter->step->where);
6267 /* Convert start, end, and step to the same type as var. */
6268 if (iter->start->ts.kind != iter->var->ts.kind
6269 || iter->start->ts.type != iter->var->ts.type)
6270 gfc_convert_type (iter->start, &iter->var->ts, 2);
6272 if (iter->end->ts.kind != iter->var->ts.kind
6273 || iter->end->ts.type != iter->var->ts.type)
6274 gfc_convert_type (iter->end, &iter->var->ts, 2);
6276 if (iter->step->ts.kind != iter->var->ts.kind
6277 || iter->step->ts.type != iter->var->ts.type)
6278 gfc_convert_type (iter->step, &iter->var->ts, 2);
6280 if (iter->start->expr_type == EXPR_CONSTANT
6281 && iter->end->expr_type == EXPR_CONSTANT
6282 && iter->step->expr_type == EXPR_CONSTANT)
6285 if (iter->start->ts.type == BT_INTEGER)
6287 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
6288 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
6292 sgn = mpfr_sgn (iter->step->value.real);
6293 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
6295 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
6296 gfc_warning ("DO loop at %L will be executed zero times",
6297 &iter->step->where);
6304 /* Traversal function for find_forall_index. f == 2 signals that
6305 that variable itself is not to be checked - only the references. */
6308 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6310 if (expr->expr_type != EXPR_VARIABLE)
6313 /* A scalar assignment */
6314 if (!expr->ref || *f == 1)
6316 if (expr->symtree->n.sym == sym)
6328 /* Check whether the FORALL index appears in the expression or not.
6329 Returns SUCCESS if SYM is found in EXPR. */
6332 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6334 if (gfc_traverse_expr (expr, sym, forall_index, f))
6341 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6342 to be a scalar INTEGER variable. The subscripts and stride are scalar
6343 INTEGERs, and if stride is a constant it must be nonzero.
6344 Furthermore "A subscript or stride in a forall-triplet-spec shall
6345 not contain a reference to any index-name in the
6346 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6349 resolve_forall_iterators (gfc_forall_iterator *it)
6351 gfc_forall_iterator *iter, *iter2;
6353 for (iter = it; iter; iter = iter->next)
6355 if (gfc_resolve_expr (iter->var) == SUCCESS
6356 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6357 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6360 if (gfc_resolve_expr (iter->start) == SUCCESS
6361 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6362 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6363 &iter->start->where);
6364 if (iter->var->ts.kind != iter->start->ts.kind)
6365 gfc_convert_type (iter->start, &iter->var->ts, 2);
6367 if (gfc_resolve_expr (iter->end) == SUCCESS
6368 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6369 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6371 if (iter->var->ts.kind != iter->end->ts.kind)
6372 gfc_convert_type (iter->end, &iter->var->ts, 2);
6374 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6376 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6377 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6378 &iter->stride->where, "INTEGER");
6380 if (iter->stride->expr_type == EXPR_CONSTANT
6381 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6382 gfc_error ("FORALL stride expression at %L cannot be zero",
6383 &iter->stride->where);
6385 if (iter->var->ts.kind != iter->stride->ts.kind)
6386 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6389 for (iter = it; iter; iter = iter->next)
6390 for (iter2 = iter; iter2; iter2 = iter2->next)
6392 if (find_forall_index (iter2->start,
6393 iter->var->symtree->n.sym, 0) == SUCCESS
6394 || find_forall_index (iter2->end,
6395 iter->var->symtree->n.sym, 0) == SUCCESS
6396 || find_forall_index (iter2->stride,
6397 iter->var->symtree->n.sym, 0) == SUCCESS)
6398 gfc_error ("FORALL index '%s' may not appear in triplet "
6399 "specification at %L", iter->var->symtree->name,
6400 &iter2->start->where);
6405 /* Given a pointer to a symbol that is a derived type, see if it's
6406 inaccessible, i.e. if it's defined in another module and the components are
6407 PRIVATE. The search is recursive if necessary. Returns zero if no
6408 inaccessible components are found, nonzero otherwise. */
6411 derived_inaccessible (gfc_symbol *sym)
6415 if (sym->attr.use_assoc && sym->attr.private_comp)
6418 for (c = sym->components; c; c = c->next)
6420 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6428 /* Resolve the argument of a deallocate expression. The expression must be
6429 a pointer or a full array. */
6432 resolve_deallocate_expr (gfc_expr *e)
6434 symbol_attribute attr;
6435 int allocatable, pointer;
6440 if (gfc_resolve_expr (e) == FAILURE)
6443 if (e->expr_type != EXPR_VARIABLE)
6446 sym = e->symtree->n.sym;
6448 if (sym->ts.type == BT_CLASS)
6450 allocatable = CLASS_DATA (sym)->attr.allocatable;
6451 pointer = CLASS_DATA (sym)->attr.class_pointer;
6455 allocatable = sym->attr.allocatable;
6456 pointer = sym->attr.pointer;
6458 for (ref = e->ref; ref; ref = ref->next)
6463 if (ref->u.ar.type != AR_FULL)
6468 c = ref->u.c.component;
6469 if (c->ts.type == BT_CLASS)
6471 allocatable = CLASS_DATA (c)->attr.allocatable;
6472 pointer = CLASS_DATA (c)->attr.class_pointer;
6476 allocatable = c->attr.allocatable;
6477 pointer = c->attr.pointer;
6487 attr = gfc_expr_attr (e);
6489 if (allocatable == 0 && attr.pointer == 0)
6492 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6498 if (gfc_is_coindexed (e))
6500 gfc_error ("Coindexed allocatable object at %L", &e->where);
6505 && gfc_check_vardef_context (e, true, _("DEALLOCATE object")) == FAILURE)
6507 if (gfc_check_vardef_context (e, false, _("DEALLOCATE object")) == FAILURE)
6514 /* Returns true if the expression e contains a reference to the symbol sym. */
6516 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6518 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6525 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6527 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6531 /* Given the expression node e for an allocatable/pointer of derived type to be
6532 allocated, get the expression node to be initialized afterwards (needed for
6533 derived types with default initializers, and derived types with allocatable
6534 components that need nullification.) */
6537 gfc_expr_to_initialize (gfc_expr *e)
6543 result = gfc_copy_expr (e);
6545 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6546 for (ref = result->ref; ref; ref = ref->next)
6547 if (ref->type == REF_ARRAY && ref->next == NULL)
6549 ref->u.ar.type = AR_FULL;
6551 for (i = 0; i < ref->u.ar.dimen; i++)
6552 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6554 result->rank = ref->u.ar.dimen;
6562 /* If the last ref of an expression is an array ref, return a copy of the
6563 expression with that one removed. Otherwise, a copy of the original
6564 expression. This is used for allocate-expressions and pointer assignment
6565 LHS, where there may be an array specification that needs to be stripped
6566 off when using gfc_check_vardef_context. */
6569 remove_last_array_ref (gfc_expr* e)
6574 e2 = gfc_copy_expr (e);
6575 for (r = &e2->ref; *r; r = &(*r)->next)
6576 if ((*r)->type == REF_ARRAY && !(*r)->next)
6578 gfc_free_ref_list (*r);
6587 /* Used in resolve_allocate_expr to check that a allocation-object and
6588 a source-expr are conformable. This does not catch all possible
6589 cases; in particular a runtime checking is needed. */
6592 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6595 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6597 /* First compare rank. */
6598 if (tail && e1->rank != tail->u.ar.as->rank)
6600 gfc_error ("Source-expr at %L must be scalar or have the "
6601 "same rank as the allocate-object at %L",
6602 &e1->where, &e2->where);
6613 for (i = 0; i < e1->rank; i++)
6615 if (tail->u.ar.end[i])
6617 mpz_set (s, tail->u.ar.end[i]->value.integer);
6618 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6619 mpz_add_ui (s, s, 1);
6623 mpz_set (s, tail->u.ar.start[i]->value.integer);
6626 if (mpz_cmp (e1->shape[i], s) != 0)
6628 gfc_error ("Source-expr at %L and allocate-object at %L must "
6629 "have the same shape", &e1->where, &e2->where);
6642 /* Resolve the expression in an ALLOCATE statement, doing the additional
6643 checks to see whether the expression is OK or not. The expression must
6644 have a trailing array reference that gives the size of the array. */
6647 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6649 int i, pointer, allocatable, dimension, is_abstract;
6652 symbol_attribute attr;
6653 gfc_ref *ref, *ref2;
6656 gfc_symbol *sym = NULL;
6661 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6662 checking of coarrays. */
6663 for (ref = e->ref; ref; ref = ref->next)
6664 if (ref->next == NULL)
6667 if (ref && ref->type == REF_ARRAY)
6668 ref->u.ar.in_allocate = true;
6670 if (gfc_resolve_expr (e) == FAILURE)
6673 /* Make sure the expression is allocatable or a pointer. If it is
6674 pointer, the next-to-last reference must be a pointer. */
6678 sym = e->symtree->n.sym;
6680 /* Check whether ultimate component is abstract and CLASS. */
6683 if (e->expr_type != EXPR_VARIABLE)
6686 attr = gfc_expr_attr (e);
6687 pointer = attr.pointer;
6688 dimension = attr.dimension;
6689 codimension = attr.codimension;
6693 if (sym->ts.type == BT_CLASS)
6695 allocatable = CLASS_DATA (sym)->attr.allocatable;
6696 pointer = CLASS_DATA (sym)->attr.class_pointer;
6697 dimension = CLASS_DATA (sym)->attr.dimension;
6698 codimension = CLASS_DATA (sym)->attr.codimension;
6699 is_abstract = CLASS_DATA (sym)->attr.abstract;
6703 allocatable = sym->attr.allocatable;
6704 pointer = sym->attr.pointer;
6705 dimension = sym->attr.dimension;
6706 codimension = sym->attr.codimension;
6711 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6716 if (ref->u.ar.codimen > 0)
6719 for (n = ref->u.ar.dimen;
6720 n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
6721 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
6728 if (ref->next != NULL)
6736 gfc_error ("Coindexed allocatable object at %L",
6741 c = ref->u.c.component;
6742 if (c->ts.type == BT_CLASS)
6744 allocatable = CLASS_DATA (c)->attr.allocatable;
6745 pointer = CLASS_DATA (c)->attr.class_pointer;
6746 dimension = CLASS_DATA (c)->attr.dimension;
6747 codimension = CLASS_DATA (c)->attr.codimension;
6748 is_abstract = CLASS_DATA (c)->attr.abstract;
6752 allocatable = c->attr.allocatable;
6753 pointer = c->attr.pointer;
6754 dimension = c->attr.dimension;
6755 codimension = c->attr.codimension;
6756 is_abstract = c->attr.abstract;
6768 if (allocatable == 0 && pointer == 0)
6770 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6775 /* Some checks for the SOURCE tag. */
6778 /* Check F03:C631. */
6779 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6781 gfc_error ("Type of entity at %L is type incompatible with "
6782 "source-expr at %L", &e->where, &code->expr3->where);
6786 /* Check F03:C632 and restriction following Note 6.18. */
6787 if (code->expr3->rank > 0
6788 && conformable_arrays (code->expr3, e) == FAILURE)
6791 /* Check F03:C633. */
6792 if (code->expr3->ts.kind != e->ts.kind)
6794 gfc_error ("The allocate-object at %L and the source-expr at %L "
6795 "shall have the same kind type parameter",
6796 &e->where, &code->expr3->where);
6801 /* Check F08:C629. */
6802 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6805 gcc_assert (e->ts.type == BT_CLASS);
6806 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6807 "type-spec or source-expr", sym->name, &e->where);
6811 /* In the variable definition context checks, gfc_expr_attr is used
6812 on the expression. This is fooled by the array specification
6813 present in e, thus we have to eliminate that one temporarily. */
6814 e2 = remove_last_array_ref (e);
6816 if (t == SUCCESS && pointer)
6817 t = gfc_check_vardef_context (e2, true, _("ALLOCATE object"));
6819 t = gfc_check_vardef_context (e2, false, _("ALLOCATE object"));
6826 /* Set up default initializer if needed. */
6830 if (code->ext.alloc.ts.type == BT_DERIVED)
6831 ts = code->ext.alloc.ts;
6835 if (ts.type == BT_CLASS)
6836 ts = ts.u.derived->components->ts;
6838 if (ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&ts)))
6840 gfc_code *init_st = gfc_get_code ();
6841 init_st->loc = code->loc;
6842 init_st->op = EXEC_INIT_ASSIGN;
6843 init_st->expr1 = gfc_expr_to_initialize (e);
6844 init_st->expr2 = init_e;
6845 init_st->next = code->next;
6846 code->next = init_st;
6849 else if (code->expr3->mold && code->expr3->ts.type == BT_DERIVED)
6851 /* Default initialization via MOLD (non-polymorphic). */
6852 gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
6853 gfc_resolve_expr (rhs);
6854 gfc_free_expr (code->expr3);
6858 if (e->ts.type == BT_CLASS)
6860 /* Make sure the vtab symbol is present when
6861 the module variables are generated. */
6862 gfc_typespec ts = e->ts;
6864 ts = code->expr3->ts;
6865 else if (code->ext.alloc.ts.type == BT_DERIVED)
6866 ts = code->ext.alloc.ts;
6867 gfc_find_derived_vtab (ts.u.derived);
6870 if (pointer || (dimension == 0 && codimension == 0))
6873 /* Make sure the last reference node is an array specifiction. */
6875 if (!ref2 || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6876 || (dimension && ref2->u.ar.dimen == 0))
6878 gfc_error ("Array specification required in ALLOCATE statement "
6879 "at %L", &e->where);
6883 /* Make sure that the array section reference makes sense in the
6884 context of an ALLOCATE specification. */
6889 for (i = ar->dimen; i < ar->dimen + ar->codimen; i++)
6890 if (ar->dimen_type[i] == DIMEN_THIS_IMAGE)
6892 gfc_error ("Coarray specification required in ALLOCATE statement "
6893 "at %L", &e->where);
6897 for (i = 0; i < ar->dimen; i++)
6899 if (ref2->u.ar.type == AR_ELEMENT)
6902 switch (ar->dimen_type[i])
6908 if (ar->start[i] != NULL
6909 && ar->end[i] != NULL
6910 && ar->stride[i] == NULL)
6913 /* Fall Through... */
6918 case DIMEN_THIS_IMAGE:
6919 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6925 for (a = code->ext.alloc.list; a; a = a->next)
6927 sym = a->expr->symtree->n.sym;
6929 /* TODO - check derived type components. */
6930 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6933 if ((ar->start[i] != NULL
6934 && gfc_find_sym_in_expr (sym, ar->start[i]))
6935 || (ar->end[i] != NULL
6936 && gfc_find_sym_in_expr (sym, ar->end[i])))
6938 gfc_error ("'%s' must not appear in the array specification at "
6939 "%L in the same ALLOCATE statement where it is "
6940 "itself allocated", sym->name, &ar->where);
6946 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6948 if (ar->dimen_type[i] == DIMEN_ELEMENT
6949 || ar->dimen_type[i] == DIMEN_RANGE)
6951 if (i == (ar->dimen + ar->codimen - 1))
6953 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6954 "statement at %L", &e->where);
6960 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6961 && ar->stride[i] == NULL)
6964 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6969 if (codimension && ar->as->rank == 0)
6971 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6972 "at %L", &e->where);
6984 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6986 gfc_expr *stat, *errmsg, *pe, *qe;
6987 gfc_alloc *a, *p, *q;
6990 errmsg = code->expr2;
6992 /* Check the stat variable. */
6995 gfc_check_vardef_context (stat, false, _("STAT variable"));
6997 if ((stat->ts.type != BT_INTEGER
6998 && !(stat->ref && (stat->ref->type == REF_ARRAY
6999 || stat->ref->type == REF_COMPONENT)))
7001 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
7002 "variable", &stat->where);
7004 for (p = code->ext.alloc.list; p; p = p->next)
7005 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
7007 gfc_ref *ref1, *ref2;
7010 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
7011 ref1 = ref1->next, ref2 = ref2->next)
7013 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7015 if (ref1->u.c.component->name != ref2->u.c.component->name)
7024 gfc_error ("Stat-variable at %L shall not be %sd within "
7025 "the same %s statement", &stat->where, fcn, fcn);
7031 /* Check the errmsg variable. */
7035 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
7038 gfc_check_vardef_context (errmsg, false, _("ERRMSG variable"));
7040 if ((errmsg->ts.type != BT_CHARACTER
7042 && (errmsg->ref->type == REF_ARRAY
7043 || errmsg->ref->type == REF_COMPONENT)))
7044 || errmsg->rank > 0 )
7045 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
7046 "variable", &errmsg->where);
7048 for (p = code->ext.alloc.list; p; p = p->next)
7049 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
7051 gfc_ref *ref1, *ref2;
7054 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
7055 ref1 = ref1->next, ref2 = ref2->next)
7057 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7059 if (ref1->u.c.component->name != ref2->u.c.component->name)
7068 gfc_error ("Errmsg-variable at %L shall not be %sd within "
7069 "the same %s statement", &errmsg->where, fcn, fcn);
7075 /* Check that an allocate-object appears only once in the statement.
7076 FIXME: Checking derived types is disabled. */
7077 for (p = code->ext.alloc.list; p; p = p->next)
7080 for (q = p->next; q; q = q->next)
7083 if (pe->symtree->n.sym->name == qe->symtree->n.sym->name)
7085 /* This is a potential collision. */
7086 gfc_ref *pr = pe->ref;
7087 gfc_ref *qr = qe->ref;
7089 /* Follow the references until
7090 a) They start to differ, in which case there is no error;
7091 you can deallocate a%b and a%c in a single statement
7092 b) Both of them stop, which is an error
7093 c) One of them stops, which is also an error. */
7096 if (pr == NULL && qr == NULL)
7098 gfc_error ("Allocate-object at %L also appears at %L",
7099 &pe->where, &qe->where);
7102 else if (pr != NULL && qr == NULL)
7104 gfc_error ("Allocate-object at %L is subobject of"
7105 " object at %L", &pe->where, &qe->where);
7108 else if (pr == NULL && qr != NULL)
7110 gfc_error ("Allocate-object at %L is subobject of"
7111 " object at %L", &qe->where, &pe->where);
7114 /* Here, pr != NULL && qr != NULL */
7115 gcc_assert(pr->type == qr->type);
7116 if (pr->type == REF_ARRAY)
7118 /* Handle cases like allocate(v(3)%x(3), v(2)%x(3)),
7120 gcc_assert (qr->type == REF_ARRAY);
7122 if (pr->next && qr->next)
7124 gfc_array_ref *par = &(pr->u.ar);
7125 gfc_array_ref *qar = &(qr->u.ar);
7126 if (gfc_dep_compare_expr (par->start[0],
7127 qar->start[0]) != 0)
7133 if (pr->u.c.component->name != qr->u.c.component->name)
7144 if (strcmp (fcn, "ALLOCATE") == 0)
7146 for (a = code->ext.alloc.list; a; a = a->next)
7147 resolve_allocate_expr (a->expr, code);
7151 for (a = code->ext.alloc.list; a; a = a->next)
7152 resolve_deallocate_expr (a->expr);
7157 /************ SELECT CASE resolution subroutines ************/
7159 /* Callback function for our mergesort variant. Determines interval
7160 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
7161 op1 > op2. Assumes we're not dealing with the default case.
7162 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
7163 There are nine situations to check. */
7166 compare_cases (const gfc_case *op1, const gfc_case *op2)
7170 if (op1->low == NULL) /* op1 = (:L) */
7172 /* op2 = (:N), so overlap. */
7174 /* op2 = (M:) or (M:N), L < M */
7175 if (op2->low != NULL
7176 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7179 else if (op1->high == NULL) /* op1 = (K:) */
7181 /* op2 = (M:), so overlap. */
7183 /* op2 = (:N) or (M:N), K > N */
7184 if (op2->high != NULL
7185 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7188 else /* op1 = (K:L) */
7190 if (op2->low == NULL) /* op2 = (:N), K > N */
7191 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7193 else if (op2->high == NULL) /* op2 = (M:), L < M */
7194 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7196 else /* op2 = (M:N) */
7200 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7203 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7212 /* Merge-sort a double linked case list, detecting overlap in the
7213 process. LIST is the head of the double linked case list before it
7214 is sorted. Returns the head of the sorted list if we don't see any
7215 overlap, or NULL otherwise. */
7218 check_case_overlap (gfc_case *list)
7220 gfc_case *p, *q, *e, *tail;
7221 int insize, nmerges, psize, qsize, cmp, overlap_seen;
7223 /* If the passed list was empty, return immediately. */
7230 /* Loop unconditionally. The only exit from this loop is a return
7231 statement, when we've finished sorting the case list. */
7238 /* Count the number of merges we do in this pass. */
7241 /* Loop while there exists a merge to be done. */
7246 /* Count this merge. */
7249 /* Cut the list in two pieces by stepping INSIZE places
7250 forward in the list, starting from P. */
7253 for (i = 0; i < insize; i++)
7262 /* Now we have two lists. Merge them! */
7263 while (psize > 0 || (qsize > 0 && q != NULL))
7265 /* See from which the next case to merge comes from. */
7268 /* P is empty so the next case must come from Q. */
7273 else if (qsize == 0 || q == NULL)
7282 cmp = compare_cases (p, q);
7285 /* The whole case range for P is less than the
7293 /* The whole case range for Q is greater than
7294 the case range for P. */
7301 /* The cases overlap, or they are the same
7302 element in the list. Either way, we must
7303 issue an error and get the next case from P. */
7304 /* FIXME: Sort P and Q by line number. */
7305 gfc_error ("CASE label at %L overlaps with CASE "
7306 "label at %L", &p->where, &q->where);
7314 /* Add the next element to the merged list. */
7323 /* P has now stepped INSIZE places along, and so has Q. So
7324 they're the same. */
7329 /* If we have done only one merge or none at all, we've
7330 finished sorting the cases. */
7339 /* Otherwise repeat, merging lists twice the size. */
7345 /* Check to see if an expression is suitable for use in a CASE statement.
7346 Makes sure that all case expressions are scalar constants of the same
7347 type. Return FAILURE if anything is wrong. */
7350 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
7352 if (e == NULL) return SUCCESS;
7354 if (e->ts.type != case_expr->ts.type)
7356 gfc_error ("Expression in CASE statement at %L must be of type %s",
7357 &e->where, gfc_basic_typename (case_expr->ts.type));
7361 /* C805 (R808) For a given case-construct, each case-value shall be of
7362 the same type as case-expr. For character type, length differences
7363 are allowed, but the kind type parameters shall be the same. */
7365 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
7367 gfc_error ("Expression in CASE statement at %L must be of kind %d",
7368 &e->where, case_expr->ts.kind);
7372 /* Convert the case value kind to that of case expression kind,
7375 if (e->ts.kind != case_expr->ts.kind)
7376 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
7380 gfc_error ("Expression in CASE statement at %L must be scalar",
7389 /* Given a completely parsed select statement, we:
7391 - Validate all expressions and code within the SELECT.
7392 - Make sure that the selection expression is not of the wrong type.
7393 - Make sure that no case ranges overlap.
7394 - Eliminate unreachable cases and unreachable code resulting from
7395 removing case labels.
7397 The standard does allow unreachable cases, e.g. CASE (5:3). But
7398 they are a hassle for code generation, and to prevent that, we just
7399 cut them out here. This is not necessary for overlapping cases
7400 because they are illegal and we never even try to generate code.
7402 We have the additional caveat that a SELECT construct could have
7403 been a computed GOTO in the source code. Fortunately we can fairly
7404 easily work around that here: The case_expr for a "real" SELECT CASE
7405 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7406 we have to do is make sure that the case_expr is a scalar integer
7410 resolve_select (gfc_code *code)
7413 gfc_expr *case_expr;
7414 gfc_case *cp, *default_case, *tail, *head;
7415 int seen_unreachable;
7421 if (code->expr1 == NULL)
7423 /* This was actually a computed GOTO statement. */
7424 case_expr = code->expr2;
7425 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7426 gfc_error ("Selection expression in computed GOTO statement "
7427 "at %L must be a scalar integer expression",
7430 /* Further checking is not necessary because this SELECT was built
7431 by the compiler, so it should always be OK. Just move the
7432 case_expr from expr2 to expr so that we can handle computed
7433 GOTOs as normal SELECTs from here on. */
7434 code->expr1 = code->expr2;
7439 case_expr = code->expr1;
7441 type = case_expr->ts.type;
7442 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7444 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7445 &case_expr->where, gfc_typename (&case_expr->ts));
7447 /* Punt. Going on here just produce more garbage error messages. */
7451 if (case_expr->rank != 0)
7453 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7454 "expression", &case_expr->where);
7461 /* Raise a warning if an INTEGER case value exceeds the range of
7462 the case-expr. Later, all expressions will be promoted to the
7463 largest kind of all case-labels. */
7465 if (type == BT_INTEGER)
7466 for (body = code->block; body; body = body->block)
7467 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7470 && gfc_check_integer_range (cp->low->value.integer,
7471 case_expr->ts.kind) != ARITH_OK)
7472 gfc_warning ("Expression in CASE statement at %L is "
7473 "not in the range of %s", &cp->low->where,
7474 gfc_typename (&case_expr->ts));
7477 && cp->low != cp->high
7478 && gfc_check_integer_range (cp->high->value.integer,
7479 case_expr->ts.kind) != ARITH_OK)
7480 gfc_warning ("Expression in CASE statement at %L is "
7481 "not in the range of %s", &cp->high->where,
7482 gfc_typename (&case_expr->ts));
7485 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7486 of the SELECT CASE expression and its CASE values. Walk the lists
7487 of case values, and if we find a mismatch, promote case_expr to
7488 the appropriate kind. */
7490 if (type == BT_LOGICAL || type == BT_INTEGER)
7492 for (body = code->block; body; body = body->block)
7494 /* Walk the case label list. */
7495 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7497 /* Intercept the DEFAULT case. It does not have a kind. */
7498 if (cp->low == NULL && cp->high == NULL)
7501 /* Unreachable case ranges are discarded, so ignore. */
7502 if (cp->low != NULL && cp->high != NULL
7503 && cp->low != cp->high
7504 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7508 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7509 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7511 if (cp->high != NULL
7512 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7513 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7518 /* Assume there is no DEFAULT case. */
7519 default_case = NULL;
7524 for (body = code->block; body; body = body->block)
7526 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7528 seen_unreachable = 0;
7530 /* Walk the case label list, making sure that all case labels
7532 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7534 /* Count the number of cases in the whole construct. */
7537 /* Intercept the DEFAULT case. */
7538 if (cp->low == NULL && cp->high == NULL)
7540 if (default_case != NULL)
7542 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7543 "by a second DEFAULT CASE at %L",
7544 &default_case->where, &cp->where);
7555 /* Deal with single value cases and case ranges. Errors are
7556 issued from the validation function. */
7557 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7558 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7564 if (type == BT_LOGICAL
7565 && ((cp->low == NULL || cp->high == NULL)
7566 || cp->low != cp->high))
7568 gfc_error ("Logical range in CASE statement at %L is not "
7569 "allowed", &cp->low->where);
7574 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7577 value = cp->low->value.logical == 0 ? 2 : 1;
7578 if (value & seen_logical)
7580 gfc_error ("Constant logical value in CASE statement "
7581 "is repeated at %L",
7586 seen_logical |= value;
7589 if (cp->low != NULL && cp->high != NULL
7590 && cp->low != cp->high
7591 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7593 if (gfc_option.warn_surprising)
7594 gfc_warning ("Range specification at %L can never "
7595 "be matched", &cp->where);
7597 cp->unreachable = 1;
7598 seen_unreachable = 1;
7602 /* If the case range can be matched, it can also overlap with
7603 other cases. To make sure it does not, we put it in a
7604 double linked list here. We sort that with a merge sort
7605 later on to detect any overlapping cases. */
7609 head->right = head->left = NULL;
7614 tail->right->left = tail;
7621 /* It there was a failure in the previous case label, give up
7622 for this case label list. Continue with the next block. */
7626 /* See if any case labels that are unreachable have been seen.
7627 If so, we eliminate them. This is a bit of a kludge because
7628 the case lists for a single case statement (label) is a
7629 single forward linked lists. */
7630 if (seen_unreachable)
7632 /* Advance until the first case in the list is reachable. */
7633 while (body->ext.block.case_list != NULL
7634 && body->ext.block.case_list->unreachable)
7636 gfc_case *n = body->ext.block.case_list;
7637 body->ext.block.case_list = body->ext.block.case_list->next;
7639 gfc_free_case_list (n);
7642 /* Strip all other unreachable cases. */
7643 if (body->ext.block.case_list)
7645 for (cp = body->ext.block.case_list; cp->next; cp = cp->next)
7647 if (cp->next->unreachable)
7649 gfc_case *n = cp->next;
7650 cp->next = cp->next->next;
7652 gfc_free_case_list (n);
7659 /* See if there were overlapping cases. If the check returns NULL,
7660 there was overlap. In that case we don't do anything. If head
7661 is non-NULL, we prepend the DEFAULT case. The sorted list can
7662 then used during code generation for SELECT CASE constructs with
7663 a case expression of a CHARACTER type. */
7666 head = check_case_overlap (head);
7668 /* Prepend the default_case if it is there. */
7669 if (head != NULL && default_case)
7671 default_case->left = NULL;
7672 default_case->right = head;
7673 head->left = default_case;
7677 /* Eliminate dead blocks that may be the result if we've seen
7678 unreachable case labels for a block. */
7679 for (body = code; body && body->block; body = body->block)
7681 if (body->block->ext.block.case_list == NULL)
7683 /* Cut the unreachable block from the code chain. */
7684 gfc_code *c = body->block;
7685 body->block = c->block;
7687 /* Kill the dead block, but not the blocks below it. */
7689 gfc_free_statements (c);
7693 /* More than two cases is legal but insane for logical selects.
7694 Issue a warning for it. */
7695 if (gfc_option.warn_surprising && type == BT_LOGICAL
7697 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7702 /* Check if a derived type is extensible. */
7705 gfc_type_is_extensible (gfc_symbol *sym)
7707 return !(sym->attr.is_bind_c || sym->attr.sequence);
7711 /* Resolve an associate name: Resolve target and ensure the type-spec is
7712 correct as well as possibly the array-spec. */
7715 resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
7719 gcc_assert (sym->assoc);
7720 gcc_assert (sym->attr.flavor == FL_VARIABLE);
7722 /* If this is for SELECT TYPE, the target may not yet be set. In that
7723 case, return. Resolution will be called later manually again when
7725 target = sym->assoc->target;
7728 gcc_assert (!sym->assoc->dangling);
7730 if (resolve_target && gfc_resolve_expr (target) != SUCCESS)
7733 /* For variable targets, we get some attributes from the target. */
7734 if (target->expr_type == EXPR_VARIABLE)
7738 gcc_assert (target->symtree);
7739 tsym = target->symtree->n.sym;
7741 sym->attr.asynchronous = tsym->attr.asynchronous;
7742 sym->attr.volatile_ = tsym->attr.volatile_;
7744 sym->attr.target = (tsym->attr.target || tsym->attr.pointer);
7747 /* Get type if this was not already set. Note that it can be
7748 some other type than the target in case this is a SELECT TYPE
7749 selector! So we must not update when the type is already there. */
7750 if (sym->ts.type == BT_UNKNOWN)
7751 sym->ts = target->ts;
7752 gcc_assert (sym->ts.type != BT_UNKNOWN);
7754 /* See if this is a valid association-to-variable. */
7755 sym->assoc->variable = (target->expr_type == EXPR_VARIABLE
7756 && !gfc_has_vector_subscript (target));
7758 /* Finally resolve if this is an array or not. */
7759 if (sym->attr.dimension && target->rank == 0)
7761 gfc_error ("Associate-name '%s' at %L is used as array",
7762 sym->name, &sym->declared_at);
7763 sym->attr.dimension = 0;
7766 if (target->rank > 0)
7767 sym->attr.dimension = 1;
7769 if (sym->attr.dimension)
7771 sym->as = gfc_get_array_spec ();
7772 sym->as->rank = target->rank;
7773 sym->as->type = AS_DEFERRED;
7775 /* Target must not be coindexed, thus the associate-variable
7777 sym->as->corank = 0;
7782 /* Resolve a SELECT TYPE statement. */
7785 resolve_select_type (gfc_code *code, gfc_namespace *old_ns)
7787 gfc_symbol *selector_type;
7788 gfc_code *body, *new_st, *if_st, *tail;
7789 gfc_code *class_is = NULL, *default_case = NULL;
7792 char name[GFC_MAX_SYMBOL_LEN];
7796 ns = code->ext.block.ns;
7799 /* Check for F03:C813. */
7800 if (code->expr1->ts.type != BT_CLASS
7801 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7803 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7804 "at %L", &code->loc);
7810 if (code->expr1->symtree->n.sym->attr.untyped)
7811 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7812 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7815 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7817 /* Loop over TYPE IS / CLASS IS cases. */
7818 for (body = code->block; body; body = body->block)
7820 c = body->ext.block.case_list;
7822 /* Check F03:C815. */
7823 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7824 && !gfc_type_is_extensible (c->ts.u.derived))
7826 gfc_error ("Derived type '%s' at %L must be extensible",
7827 c->ts.u.derived->name, &c->where);
7832 /* Check F03:C816. */
7833 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7834 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7836 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7837 c->ts.u.derived->name, &c->where, selector_type->name);
7842 /* Intercept the DEFAULT case. */
7843 if (c->ts.type == BT_UNKNOWN)
7845 /* Check F03:C818. */
7848 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7849 "by a second DEFAULT CASE at %L",
7850 &default_case->ext.block.case_list->where, &c->where);
7855 default_case = body;
7862 /* Transform SELECT TYPE statement to BLOCK and associate selector to
7863 target if present. If there are any EXIT statements referring to the
7864 SELECT TYPE construct, this is no problem because the gfc_code
7865 reference stays the same and EXIT is equally possible from the BLOCK
7866 it is changed to. */
7867 code->op = EXEC_BLOCK;
7870 gfc_association_list* assoc;
7872 assoc = gfc_get_association_list ();
7873 assoc->st = code->expr1->symtree;
7874 assoc->target = gfc_copy_expr (code->expr2);
7875 /* assoc->variable will be set by resolve_assoc_var. */
7877 code->ext.block.assoc = assoc;
7878 code->expr1->symtree->n.sym->assoc = assoc;
7880 resolve_assoc_var (code->expr1->symtree->n.sym, false);
7883 code->ext.block.assoc = NULL;
7885 /* Add EXEC_SELECT to switch on type. */
7886 new_st = gfc_get_code ();
7887 new_st->op = code->op;
7888 new_st->expr1 = code->expr1;
7889 new_st->expr2 = code->expr2;
7890 new_st->block = code->block;
7891 code->expr1 = code->expr2 = NULL;
7896 ns->code->next = new_st;
7898 code->op = EXEC_SELECT;
7899 gfc_add_vptr_component (code->expr1);
7900 gfc_add_hash_component (code->expr1);
7902 /* Loop over TYPE IS / CLASS IS cases. */
7903 for (body = code->block; body; body = body->block)
7905 c = body->ext.block.case_list;
7907 if (c->ts.type == BT_DERIVED)
7908 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7909 c->ts.u.derived->hash_value);
7911 else if (c->ts.type == BT_UNKNOWN)
7914 /* Associate temporary to selector. This should only be done
7915 when this case is actually true, so build a new ASSOCIATE
7916 that does precisely this here (instead of using the
7919 if (c->ts.type == BT_CLASS)
7920 sprintf (name, "__tmp_class_%s", c->ts.u.derived->name);
7922 sprintf (name, "__tmp_type_%s", c->ts.u.derived->name);
7923 st = gfc_find_symtree (ns->sym_root, name);
7924 gcc_assert (st->n.sym->assoc);
7925 st->n.sym->assoc->target = gfc_get_variable_expr (code->expr1->symtree);
7926 if (c->ts.type == BT_DERIVED)
7927 gfc_add_data_component (st->n.sym->assoc->target);
7929 new_st = gfc_get_code ();
7930 new_st->op = EXEC_BLOCK;
7931 new_st->ext.block.ns = gfc_build_block_ns (ns);
7932 new_st->ext.block.ns->code = body->next;
7933 body->next = new_st;
7935 /* Chain in the new list only if it is marked as dangling. Otherwise
7936 there is a CASE label overlap and this is already used. Just ignore,
7937 the error is diagonsed elsewhere. */
7938 if (st->n.sym->assoc->dangling)
7940 new_st->ext.block.assoc = st->n.sym->assoc;
7941 st->n.sym->assoc->dangling = 0;
7944 resolve_assoc_var (st->n.sym, false);
7947 /* Take out CLASS IS cases for separate treatment. */
7949 while (body && body->block)
7951 if (body->block->ext.block.case_list->ts.type == BT_CLASS)
7953 /* Add to class_is list. */
7954 if (class_is == NULL)
7956 class_is = body->block;
7961 for (tail = class_is; tail->block; tail = tail->block) ;
7962 tail->block = body->block;
7965 /* Remove from EXEC_SELECT list. */
7966 body->block = body->block->block;
7979 /* Add a default case to hold the CLASS IS cases. */
7980 for (tail = code; tail->block; tail = tail->block) ;
7981 tail->block = gfc_get_code ();
7983 tail->op = EXEC_SELECT_TYPE;
7984 tail->ext.block.case_list = gfc_get_case ();
7985 tail->ext.block.case_list->ts.type = BT_UNKNOWN;
7987 default_case = tail;
7990 /* More than one CLASS IS block? */
7991 if (class_is->block)
7995 /* Sort CLASS IS blocks by extension level. */
7999 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
8002 /* F03:C817 (check for doubles). */
8003 if ((*c1)->ext.block.case_list->ts.u.derived->hash_value
8004 == c2->ext.block.case_list->ts.u.derived->hash_value)
8006 gfc_error ("Double CLASS IS block in SELECT TYPE "
8008 &c2->ext.block.case_list->where);
8011 if ((*c1)->ext.block.case_list->ts.u.derived->attr.extension
8012 < c2->ext.block.case_list->ts.u.derived->attr.extension)
8015 (*c1)->block = c2->block;
8025 /* Generate IF chain. */
8026 if_st = gfc_get_code ();
8027 if_st->op = EXEC_IF;
8029 for (body = class_is; body; body = body->block)
8031 new_st->block = gfc_get_code ();
8032 new_st = new_st->block;
8033 new_st->op = EXEC_IF;
8034 /* Set up IF condition: Call _gfortran_is_extension_of. */
8035 new_st->expr1 = gfc_get_expr ();
8036 new_st->expr1->expr_type = EXPR_FUNCTION;
8037 new_st->expr1->ts.type = BT_LOGICAL;
8038 new_st->expr1->ts.kind = 4;
8039 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
8040 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
8041 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
8042 /* Set up arguments. */
8043 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
8044 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
8045 new_st->expr1->value.function.actual->expr->where = code->loc;
8046 gfc_add_vptr_component (new_st->expr1->value.function.actual->expr);
8047 vtab = gfc_find_derived_vtab (body->ext.block.case_list->ts.u.derived);
8048 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
8049 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
8050 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
8051 new_st->next = body->next;
8053 if (default_case->next)
8055 new_st->block = gfc_get_code ();
8056 new_st = new_st->block;
8057 new_st->op = EXEC_IF;
8058 new_st->next = default_case->next;
8061 /* Replace CLASS DEFAULT code by the IF chain. */
8062 default_case->next = if_st;
8065 /* Resolve the internal code. This can not be done earlier because
8066 it requires that the sym->assoc of selectors is set already. */
8067 gfc_current_ns = ns;
8068 gfc_resolve_blocks (code->block, gfc_current_ns);
8069 gfc_current_ns = old_ns;
8071 resolve_select (code);
8075 /* Resolve a transfer statement. This is making sure that:
8076 -- a derived type being transferred has only non-pointer components
8077 -- a derived type being transferred doesn't have private components, unless
8078 it's being transferred from the module where the type was defined
8079 -- we're not trying to transfer a whole assumed size array. */
8082 resolve_transfer (gfc_code *code)
8091 while (exp != NULL && exp->expr_type == EXPR_OP
8092 && exp->value.op.op == INTRINSIC_PARENTHESES)
8093 exp = exp->value.op.op1;
8095 if (exp == NULL || (exp->expr_type != EXPR_VARIABLE
8096 && exp->expr_type != EXPR_FUNCTION))
8099 /* If we are reading, the variable will be changed. Note that
8100 code->ext.dt may be NULL if the TRANSFER is related to
8101 an INQUIRE statement -- but in this case, we are not reading, either. */
8102 if (code->ext.dt && code->ext.dt->dt_io_kind->value.iokind == M_READ
8103 && gfc_check_vardef_context (exp, false, _("item in READ")) == FAILURE)
8106 sym = exp->symtree->n.sym;
8109 /* Go to actual component transferred. */
8110 for (ref = exp->ref; ref; ref = ref->next)
8111 if (ref->type == REF_COMPONENT)
8112 ts = &ref->u.c.component->ts;
8114 if (ts->type == BT_CLASS)
8116 /* FIXME: Test for defined input/output. */
8117 gfc_error ("Data transfer element at %L cannot be polymorphic unless "
8118 "it is processed by a defined input/output procedure",
8123 if (ts->type == BT_DERIVED)
8125 /* Check that transferred derived type doesn't contain POINTER
8127 if (ts->u.derived->attr.pointer_comp)
8129 gfc_error ("Data transfer element at %L cannot have "
8130 "POINTER components", &code->loc);
8135 if (ts->u.derived->attr.proc_pointer_comp)
8137 gfc_error ("Data transfer element at %L cannot have "
8138 "procedure pointer components", &code->loc);
8142 if (ts->u.derived->attr.alloc_comp)
8144 gfc_error ("Data transfer element at %L cannot have "
8145 "ALLOCATABLE components", &code->loc);
8149 if (derived_inaccessible (ts->u.derived))
8151 gfc_error ("Data transfer element at %L cannot have "
8152 "PRIVATE components",&code->loc);
8157 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
8158 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
8160 gfc_error ("Data transfer element at %L cannot be a full reference to "
8161 "an assumed-size array", &code->loc);
8167 /*********** Toplevel code resolution subroutines ***********/
8169 /* Find the set of labels that are reachable from this block. We also
8170 record the last statement in each block. */
8173 find_reachable_labels (gfc_code *block)
8180 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
8182 /* Collect labels in this block. We don't keep those corresponding
8183 to END {IF|SELECT}, these are checked in resolve_branch by going
8184 up through the code_stack. */
8185 for (c = block; c; c = c->next)
8187 if (c->here && c->op != EXEC_END_BLOCK)
8188 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
8191 /* Merge with labels from parent block. */
8194 gcc_assert (cs_base->prev->reachable_labels);
8195 bitmap_ior_into (cs_base->reachable_labels,
8196 cs_base->prev->reachable_labels);
8202 resolve_lock_unlock (gfc_code *code)
8204 /* FIXME: Add more lock-variable checks. For now, always reject it.
8205 Note that ISO_FORTRAN_ENV's LOCK_TYPE is not yet available. */
8206 /* if (code->expr2->ts.type != BT_DERIVED
8207 || code->expr2->rank != 0
8208 || code->expr2->expr_type != EXPR_VARIABLE) */
8209 gfc_error ("Lock variable at %L must be a scalar of type LOCK_TYPE",
8210 &code->expr1->where);
8214 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8215 || code->expr2->expr_type != EXPR_VARIABLE))
8216 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8217 &code->expr2->where);
8221 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8222 || code->expr3->expr_type != EXPR_VARIABLE))
8223 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8224 &code->expr3->where);
8226 /* Check ACQUIRED_LOCK. */
8228 && (code->expr4->ts.type != BT_LOGICAL || code->expr4->rank != 0
8229 || code->expr4->expr_type != EXPR_VARIABLE))
8230 gfc_error ("ACQUIRED_LOCK= argument at %L must be a scalar LOGICAL "
8231 "variable", &code->expr4->where);
8236 resolve_sync (gfc_code *code)
8238 /* Check imageset. The * case matches expr1 == NULL. */
8241 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
8242 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
8243 "INTEGER expression", &code->expr1->where);
8244 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
8245 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
8246 gfc_error ("Imageset argument at %L must between 1 and num_images()",
8247 &code->expr1->where);
8248 else if (code->expr1->expr_type == EXPR_ARRAY
8249 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
8251 gfc_constructor *cons;
8252 cons = gfc_constructor_first (code->expr1->value.constructor);
8253 for (; cons; cons = gfc_constructor_next (cons))
8254 if (cons->expr->expr_type == EXPR_CONSTANT
8255 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
8256 gfc_error ("Imageset argument at %L must between 1 and "
8257 "num_images()", &cons->expr->where);
8263 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8264 || code->expr2->expr_type != EXPR_VARIABLE))
8265 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8266 &code->expr2->where);
8270 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8271 || code->expr3->expr_type != EXPR_VARIABLE))
8272 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8273 &code->expr3->where);
8277 /* Given a branch to a label, see if the branch is conforming.
8278 The code node describes where the branch is located. */
8281 resolve_branch (gfc_st_label *label, gfc_code *code)
8288 /* Step one: is this a valid branching target? */
8290 if (label->defined == ST_LABEL_UNKNOWN)
8292 gfc_error ("Label %d referenced at %L is never defined", label->value,
8297 if (label->defined != ST_LABEL_TARGET)
8299 gfc_error ("Statement at %L is not a valid branch target statement "
8300 "for the branch statement at %L", &label->where, &code->loc);
8304 /* Step two: make sure this branch is not a branch to itself ;-) */
8306 if (code->here == label)
8308 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
8312 /* Step three: See if the label is in the same block as the
8313 branching statement. The hard work has been done by setting up
8314 the bitmap reachable_labels. */
8316 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
8318 /* Check now whether there is a CRITICAL construct; if so, check
8319 whether the label is still visible outside of the CRITICAL block,
8320 which is invalid. */
8321 for (stack = cs_base; stack; stack = stack->prev)
8322 if (stack->current->op == EXEC_CRITICAL
8323 && bitmap_bit_p (stack->reachable_labels, label->value))
8324 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8325 " at %L", &code->loc, &label->where);
8330 /* Step four: If we haven't found the label in the bitmap, it may
8331 still be the label of the END of the enclosing block, in which
8332 case we find it by going up the code_stack. */
8334 for (stack = cs_base; stack; stack = stack->prev)
8336 if (stack->current->next && stack->current->next->here == label)
8338 if (stack->current->op == EXEC_CRITICAL)
8340 /* Note: A label at END CRITICAL does not leave the CRITICAL
8341 construct as END CRITICAL is still part of it. */
8342 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8343 " at %L", &code->loc, &label->where);
8350 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
8354 /* The label is not in an enclosing block, so illegal. This was
8355 allowed in Fortran 66, so we allow it as extension. No
8356 further checks are necessary in this case. */
8357 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
8358 "as the GOTO statement at %L", &label->where,
8364 /* Check whether EXPR1 has the same shape as EXPR2. */
8367 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
8369 mpz_t shape[GFC_MAX_DIMENSIONS];
8370 mpz_t shape2[GFC_MAX_DIMENSIONS];
8371 gfc_try result = FAILURE;
8374 /* Compare the rank. */
8375 if (expr1->rank != expr2->rank)
8378 /* Compare the size of each dimension. */
8379 for (i=0; i<expr1->rank; i++)
8381 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
8384 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
8387 if (mpz_cmp (shape[i], shape2[i]))
8391 /* When either of the two expression is an assumed size array, we
8392 ignore the comparison of dimension sizes. */
8397 for (i--; i >= 0; i--)
8399 mpz_clear (shape[i]);
8400 mpz_clear (shape2[i]);
8406 /* Check whether a WHERE assignment target or a WHERE mask expression
8407 has the same shape as the outmost WHERE mask expression. */
8410 resolve_where (gfc_code *code, gfc_expr *mask)
8416 cblock = code->block;
8418 /* Store the first WHERE mask-expr of the WHERE statement or construct.
8419 In case of nested WHERE, only the outmost one is stored. */
8420 if (mask == NULL) /* outmost WHERE */
8422 else /* inner WHERE */
8429 /* Check if the mask-expr has a consistent shape with the
8430 outmost WHERE mask-expr. */
8431 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
8432 gfc_error ("WHERE mask at %L has inconsistent shape",
8433 &cblock->expr1->where);
8436 /* the assignment statement of a WHERE statement, or the first
8437 statement in where-body-construct of a WHERE construct */
8438 cnext = cblock->next;
8443 /* WHERE assignment statement */
8446 /* Check shape consistent for WHERE assignment target. */
8447 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
8448 gfc_error ("WHERE assignment target at %L has "
8449 "inconsistent shape", &cnext->expr1->where);
8453 case EXEC_ASSIGN_CALL:
8454 resolve_call (cnext);
8455 if (!cnext->resolved_sym->attr.elemental)
8456 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8457 &cnext->ext.actual->expr->where);
8460 /* WHERE or WHERE construct is part of a where-body-construct */
8462 resolve_where (cnext, e);
8466 gfc_error ("Unsupported statement inside WHERE at %L",
8469 /* the next statement within the same where-body-construct */
8470 cnext = cnext->next;
8472 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8473 cblock = cblock->block;
8478 /* Resolve assignment in FORALL construct.
8479 NVAR is the number of FORALL index variables, and VAR_EXPR records the
8480 FORALL index variables. */
8483 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
8487 for (n = 0; n < nvar; n++)
8489 gfc_symbol *forall_index;
8491 forall_index = var_expr[n]->symtree->n.sym;
8493 /* Check whether the assignment target is one of the FORALL index
8495 if ((code->expr1->expr_type == EXPR_VARIABLE)
8496 && (code->expr1->symtree->n.sym == forall_index))
8497 gfc_error ("Assignment to a FORALL index variable at %L",
8498 &code->expr1->where);
8501 /* If one of the FORALL index variables doesn't appear in the
8502 assignment variable, then there could be a many-to-one
8503 assignment. Emit a warning rather than an error because the
8504 mask could be resolving this problem. */
8505 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
8506 gfc_warning ("The FORALL with index '%s' is not used on the "
8507 "left side of the assignment at %L and so might "
8508 "cause multiple assignment to this object",
8509 var_expr[n]->symtree->name, &code->expr1->where);
8515 /* Resolve WHERE statement in FORALL construct. */
8518 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
8519 gfc_expr **var_expr)
8524 cblock = code->block;
8527 /* the assignment statement of a WHERE statement, or the first
8528 statement in where-body-construct of a WHERE construct */
8529 cnext = cblock->next;
8534 /* WHERE assignment statement */
8536 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
8539 /* WHERE operator assignment statement */
8540 case EXEC_ASSIGN_CALL:
8541 resolve_call (cnext);
8542 if (!cnext->resolved_sym->attr.elemental)
8543 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8544 &cnext->ext.actual->expr->where);
8547 /* WHERE or WHERE construct is part of a where-body-construct */
8549 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
8553 gfc_error ("Unsupported statement inside WHERE at %L",
8556 /* the next statement within the same where-body-construct */
8557 cnext = cnext->next;
8559 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8560 cblock = cblock->block;
8565 /* Traverse the FORALL body to check whether the following errors exist:
8566 1. For assignment, check if a many-to-one assignment happens.
8567 2. For WHERE statement, check the WHERE body to see if there is any
8568 many-to-one assignment. */
8571 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8575 c = code->block->next;
8581 case EXEC_POINTER_ASSIGN:
8582 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8585 case EXEC_ASSIGN_CALL:
8589 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8590 there is no need to handle it here. */
8594 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8599 /* The next statement in the FORALL body. */
8605 /* Counts the number of iterators needed inside a forall construct, including
8606 nested forall constructs. This is used to allocate the needed memory
8607 in gfc_resolve_forall. */
8610 gfc_count_forall_iterators (gfc_code *code)
8612 int max_iters, sub_iters, current_iters;
8613 gfc_forall_iterator *fa;
8615 gcc_assert(code->op == EXEC_FORALL);
8619 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8622 code = code->block->next;
8626 if (code->op == EXEC_FORALL)
8628 sub_iters = gfc_count_forall_iterators (code);
8629 if (sub_iters > max_iters)
8630 max_iters = sub_iters;
8635 return current_iters + max_iters;
8639 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8640 gfc_resolve_forall_body to resolve the FORALL body. */
8643 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8645 static gfc_expr **var_expr;
8646 static int total_var = 0;
8647 static int nvar = 0;
8649 gfc_forall_iterator *fa;
8654 /* Start to resolve a FORALL construct */
8655 if (forall_save == 0)
8657 /* Count the total number of FORALL index in the nested FORALL
8658 construct in order to allocate the VAR_EXPR with proper size. */
8659 total_var = gfc_count_forall_iterators (code);
8661 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8662 var_expr = XCNEWVEC (gfc_expr *, total_var);
8665 /* The information about FORALL iterator, including FORALL index start, end
8666 and stride. The FORALL index can not appear in start, end or stride. */
8667 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8669 /* Check if any outer FORALL index name is the same as the current
8671 for (i = 0; i < nvar; i++)
8673 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8675 gfc_error ("An outer FORALL construct already has an index "
8676 "with this name %L", &fa->var->where);
8680 /* Record the current FORALL index. */
8681 var_expr[nvar] = gfc_copy_expr (fa->var);
8685 /* No memory leak. */
8686 gcc_assert (nvar <= total_var);
8689 /* Resolve the FORALL body. */
8690 gfc_resolve_forall_body (code, nvar, var_expr);
8692 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8693 gfc_resolve_blocks (code->block, ns);
8697 /* Free only the VAR_EXPRs allocated in this frame. */
8698 for (i = nvar; i < tmp; i++)
8699 gfc_free_expr (var_expr[i]);
8703 /* We are in the outermost FORALL construct. */
8704 gcc_assert (forall_save == 0);
8706 /* VAR_EXPR is not needed any more. */
8713 /* Resolve a BLOCK construct statement. */
8716 resolve_block_construct (gfc_code* code)
8718 /* Resolve the BLOCK's namespace. */
8719 gfc_resolve (code->ext.block.ns);
8721 /* For an ASSOCIATE block, the associations (and their targets) are already
8722 resolved during resolve_symbol. */
8726 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8729 static void resolve_code (gfc_code *, gfc_namespace *);
8732 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8736 for (; b; b = b->block)
8738 t = gfc_resolve_expr (b->expr1);
8739 if (gfc_resolve_expr (b->expr2) == FAILURE)
8745 if (t == SUCCESS && b->expr1 != NULL
8746 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8747 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8754 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8755 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8760 resolve_branch (b->label1, b);
8764 resolve_block_construct (b);
8768 case EXEC_SELECT_TYPE:
8779 case EXEC_OMP_ATOMIC:
8780 case EXEC_OMP_CRITICAL:
8782 case EXEC_OMP_MASTER:
8783 case EXEC_OMP_ORDERED:
8784 case EXEC_OMP_PARALLEL:
8785 case EXEC_OMP_PARALLEL_DO:
8786 case EXEC_OMP_PARALLEL_SECTIONS:
8787 case EXEC_OMP_PARALLEL_WORKSHARE:
8788 case EXEC_OMP_SECTIONS:
8789 case EXEC_OMP_SINGLE:
8791 case EXEC_OMP_TASKWAIT:
8792 case EXEC_OMP_WORKSHARE:
8796 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8799 resolve_code (b->next, ns);
8804 /* Does everything to resolve an ordinary assignment. Returns true
8805 if this is an interface assignment. */
8807 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8817 if (gfc_extend_assign (code, ns) == SUCCESS)
8821 if (code->op == EXEC_ASSIGN_CALL)
8823 lhs = code->ext.actual->expr;
8824 rhsptr = &code->ext.actual->next->expr;
8828 gfc_actual_arglist* args;
8829 gfc_typebound_proc* tbp;
8831 gcc_assert (code->op == EXEC_COMPCALL);
8833 args = code->expr1->value.compcall.actual;
8835 rhsptr = &args->next->expr;
8837 tbp = code->expr1->value.compcall.tbp;
8838 gcc_assert (!tbp->is_generic);
8841 /* Make a temporary rhs when there is a default initializer
8842 and rhs is the same symbol as the lhs. */
8843 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8844 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8845 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8846 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8847 *rhsptr = gfc_get_parentheses (*rhsptr);
8856 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8857 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8858 &code->loc) == FAILURE)
8861 /* Handle the case of a BOZ literal on the RHS. */
8862 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8865 if (gfc_option.warn_surprising)
8866 gfc_warning ("BOZ literal at %L is bitwise transferred "
8867 "non-integer symbol '%s'", &code->loc,
8868 lhs->symtree->n.sym->name);
8870 if (!gfc_convert_boz (rhs, &lhs->ts))
8872 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8874 if (rc == ARITH_UNDERFLOW)
8875 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8876 ". This check can be disabled with the option "
8877 "-fno-range-check", &rhs->where);
8878 else if (rc == ARITH_OVERFLOW)
8879 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8880 ". This check can be disabled with the option "
8881 "-fno-range-check", &rhs->where);
8882 else if (rc == ARITH_NAN)
8883 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8884 ". This check can be disabled with the option "
8885 "-fno-range-check", &rhs->where);
8890 if (lhs->ts.type == BT_CHARACTER
8891 && gfc_option.warn_character_truncation)
8893 if (lhs->ts.u.cl != NULL
8894 && lhs->ts.u.cl->length != NULL
8895 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8896 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8898 if (rhs->expr_type == EXPR_CONSTANT)
8899 rlen = rhs->value.character.length;
8901 else if (rhs->ts.u.cl != NULL
8902 && rhs->ts.u.cl->length != NULL
8903 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8904 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8906 if (rlen && llen && rlen > llen)
8907 gfc_warning_now ("CHARACTER expression will be truncated "
8908 "in assignment (%d/%d) at %L",
8909 llen, rlen, &code->loc);
8912 /* Ensure that a vector index expression for the lvalue is evaluated
8913 to a temporary if the lvalue symbol is referenced in it. */
8916 for (ref = lhs->ref; ref; ref= ref->next)
8917 if (ref->type == REF_ARRAY)
8919 for (n = 0; n < ref->u.ar.dimen; n++)
8920 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8921 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8922 ref->u.ar.start[n]))
8924 = gfc_get_parentheses (ref->u.ar.start[n]);
8928 if (gfc_pure (NULL))
8930 if (lhs->ts.type == BT_DERIVED
8931 && lhs->expr_type == EXPR_VARIABLE
8932 && lhs->ts.u.derived->attr.pointer_comp
8933 && rhs->expr_type == EXPR_VARIABLE
8934 && (gfc_impure_variable (rhs->symtree->n.sym)
8935 || gfc_is_coindexed (rhs)))
8938 if (gfc_is_coindexed (rhs))
8939 gfc_error ("Coindexed expression at %L is assigned to "
8940 "a derived type variable with a POINTER "
8941 "component in a PURE procedure",
8944 gfc_error ("The impure variable at %L is assigned to "
8945 "a derived type variable with a POINTER "
8946 "component in a PURE procedure (12.6)",
8951 /* Fortran 2008, C1283. */
8952 if (gfc_is_coindexed (lhs))
8954 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8955 "procedure", &rhs->where);
8960 if (gfc_implicit_pure (NULL))
8962 if (lhs->expr_type == EXPR_VARIABLE
8963 && lhs->symtree->n.sym != gfc_current_ns->proc_name
8964 && lhs->symtree->n.sym->ns != gfc_current_ns)
8965 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8967 if (lhs->ts.type == BT_DERIVED
8968 && lhs->expr_type == EXPR_VARIABLE
8969 && lhs->ts.u.derived->attr.pointer_comp
8970 && rhs->expr_type == EXPR_VARIABLE
8971 && (gfc_impure_variable (rhs->symtree->n.sym)
8972 || gfc_is_coindexed (rhs)))
8973 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8975 /* Fortran 2008, C1283. */
8976 if (gfc_is_coindexed (lhs))
8977 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8981 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8982 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8983 if (lhs->ts.type == BT_CLASS)
8985 gfc_error ("Variable must not be polymorphic in assignment at %L",
8990 /* F2008, Section 7.2.1.2. */
8991 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8993 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8994 "component in assignment at %L", &lhs->where);
8998 gfc_check_assign (lhs, rhs, 1);
9003 /* Given a block of code, recursively resolve everything pointed to by this
9007 resolve_code (gfc_code *code, gfc_namespace *ns)
9009 int omp_workshare_save;
9014 frame.prev = cs_base;
9018 find_reachable_labels (code);
9020 for (; code; code = code->next)
9022 frame.current = code;
9023 forall_save = forall_flag;
9025 if (code->op == EXEC_FORALL)
9028 gfc_resolve_forall (code, ns, forall_save);
9031 else if (code->block)
9033 omp_workshare_save = -1;
9036 case EXEC_OMP_PARALLEL_WORKSHARE:
9037 omp_workshare_save = omp_workshare_flag;
9038 omp_workshare_flag = 1;
9039 gfc_resolve_omp_parallel_blocks (code, ns);
9041 case EXEC_OMP_PARALLEL:
9042 case EXEC_OMP_PARALLEL_DO:
9043 case EXEC_OMP_PARALLEL_SECTIONS:
9045 omp_workshare_save = omp_workshare_flag;
9046 omp_workshare_flag = 0;
9047 gfc_resolve_omp_parallel_blocks (code, ns);
9050 gfc_resolve_omp_do_blocks (code, ns);
9052 case EXEC_SELECT_TYPE:
9053 /* Blocks are handled in resolve_select_type because we have
9054 to transform the SELECT TYPE into ASSOCIATE first. */
9056 case EXEC_OMP_WORKSHARE:
9057 omp_workshare_save = omp_workshare_flag;
9058 omp_workshare_flag = 1;
9061 gfc_resolve_blocks (code->block, ns);
9065 if (omp_workshare_save != -1)
9066 omp_workshare_flag = omp_workshare_save;
9070 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
9071 t = gfc_resolve_expr (code->expr1);
9072 forall_flag = forall_save;
9074 if (gfc_resolve_expr (code->expr2) == FAILURE)
9077 if (code->op == EXEC_ALLOCATE
9078 && gfc_resolve_expr (code->expr3) == FAILURE)
9084 case EXEC_END_BLOCK:
9088 case EXEC_ERROR_STOP:
9092 case EXEC_ASSIGN_CALL:
9097 case EXEC_SYNC_IMAGES:
9098 case EXEC_SYNC_MEMORY:
9099 resolve_sync (code);
9104 resolve_lock_unlock (code);
9108 /* Keep track of which entry we are up to. */
9109 current_entry_id = code->ext.entry->id;
9113 resolve_where (code, NULL);
9117 if (code->expr1 != NULL)
9119 if (code->expr1->ts.type != BT_INTEGER)
9120 gfc_error ("ASSIGNED GOTO statement at %L requires an "
9121 "INTEGER variable", &code->expr1->where);
9122 else if (code->expr1->symtree->n.sym->attr.assign != 1)
9123 gfc_error ("Variable '%s' has not been assigned a target "
9124 "label at %L", code->expr1->symtree->n.sym->name,
9125 &code->expr1->where);
9128 resolve_branch (code->label1, code);
9132 if (code->expr1 != NULL
9133 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
9134 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
9135 "INTEGER return specifier", &code->expr1->where);
9138 case EXEC_INIT_ASSIGN:
9139 case EXEC_END_PROCEDURE:
9146 if (gfc_check_vardef_context (code->expr1, false, _("assignment"))
9150 if (resolve_ordinary_assign (code, ns))
9152 if (code->op == EXEC_COMPCALL)
9159 case EXEC_LABEL_ASSIGN:
9160 if (code->label1->defined == ST_LABEL_UNKNOWN)
9161 gfc_error ("Label %d referenced at %L is never defined",
9162 code->label1->value, &code->label1->where);
9164 && (code->expr1->expr_type != EXPR_VARIABLE
9165 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
9166 || code->expr1->symtree->n.sym->ts.kind
9167 != gfc_default_integer_kind
9168 || code->expr1->symtree->n.sym->as != NULL))
9169 gfc_error ("ASSIGN statement at %L requires a scalar "
9170 "default INTEGER variable", &code->expr1->where);
9173 case EXEC_POINTER_ASSIGN:
9180 /* This is both a variable definition and pointer assignment
9181 context, so check both of them. For rank remapping, a final
9182 array ref may be present on the LHS and fool gfc_expr_attr
9183 used in gfc_check_vardef_context. Remove it. */
9184 e = remove_last_array_ref (code->expr1);
9185 t = gfc_check_vardef_context (e, true, _("pointer assignment"));
9187 t = gfc_check_vardef_context (e, false, _("pointer assignment"));
9192 gfc_check_pointer_assign (code->expr1, code->expr2);
9196 case EXEC_ARITHMETIC_IF:
9198 && code->expr1->ts.type != BT_INTEGER
9199 && code->expr1->ts.type != BT_REAL)
9200 gfc_error ("Arithmetic IF statement at %L requires a numeric "
9201 "expression", &code->expr1->where);
9203 resolve_branch (code->label1, code);
9204 resolve_branch (code->label2, code);
9205 resolve_branch (code->label3, code);
9209 if (t == SUCCESS && code->expr1 != NULL
9210 && (code->expr1->ts.type != BT_LOGICAL
9211 || code->expr1->rank != 0))
9212 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
9213 &code->expr1->where);
9218 resolve_call (code);
9223 resolve_typebound_subroutine (code);
9227 resolve_ppc_call (code);
9231 /* Select is complicated. Also, a SELECT construct could be
9232 a transformed computed GOTO. */
9233 resolve_select (code);
9236 case EXEC_SELECT_TYPE:
9237 resolve_select_type (code, ns);
9241 resolve_block_construct (code);
9245 if (code->ext.iterator != NULL)
9247 gfc_iterator *iter = code->ext.iterator;
9248 if (gfc_resolve_iterator (iter, true) != FAILURE)
9249 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
9254 if (code->expr1 == NULL)
9255 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
9257 && (code->expr1->rank != 0
9258 || code->expr1->ts.type != BT_LOGICAL))
9259 gfc_error ("Exit condition of DO WHILE loop at %L must be "
9260 "a scalar LOGICAL expression", &code->expr1->where);
9265 resolve_allocate_deallocate (code, "ALLOCATE");
9269 case EXEC_DEALLOCATE:
9271 resolve_allocate_deallocate (code, "DEALLOCATE");
9276 if (gfc_resolve_open (code->ext.open) == FAILURE)
9279 resolve_branch (code->ext.open->err, code);
9283 if (gfc_resolve_close (code->ext.close) == FAILURE)
9286 resolve_branch (code->ext.close->err, code);
9289 case EXEC_BACKSPACE:
9293 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
9296 resolve_branch (code->ext.filepos->err, code);
9300 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9303 resolve_branch (code->ext.inquire->err, code);
9307 gcc_assert (code->ext.inquire != NULL);
9308 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9311 resolve_branch (code->ext.inquire->err, code);
9315 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
9318 resolve_branch (code->ext.wait->err, code);
9319 resolve_branch (code->ext.wait->end, code);
9320 resolve_branch (code->ext.wait->eor, code);
9325 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
9328 resolve_branch (code->ext.dt->err, code);
9329 resolve_branch (code->ext.dt->end, code);
9330 resolve_branch (code->ext.dt->eor, code);
9334 resolve_transfer (code);
9338 resolve_forall_iterators (code->ext.forall_iterator);
9340 if (code->expr1 != NULL
9341 && (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank))
9342 gfc_error ("FORALL mask clause at %L requires a scalar LOGICAL "
9343 "expression", &code->expr1->where);
9346 case EXEC_OMP_ATOMIC:
9347 case EXEC_OMP_BARRIER:
9348 case EXEC_OMP_CRITICAL:
9349 case EXEC_OMP_FLUSH:
9351 case EXEC_OMP_MASTER:
9352 case EXEC_OMP_ORDERED:
9353 case EXEC_OMP_SECTIONS:
9354 case EXEC_OMP_SINGLE:
9355 case EXEC_OMP_TASKWAIT:
9356 case EXEC_OMP_WORKSHARE:
9357 gfc_resolve_omp_directive (code, ns);
9360 case EXEC_OMP_PARALLEL:
9361 case EXEC_OMP_PARALLEL_DO:
9362 case EXEC_OMP_PARALLEL_SECTIONS:
9363 case EXEC_OMP_PARALLEL_WORKSHARE:
9365 omp_workshare_save = omp_workshare_flag;
9366 omp_workshare_flag = 0;
9367 gfc_resolve_omp_directive (code, ns);
9368 omp_workshare_flag = omp_workshare_save;
9372 gfc_internal_error ("resolve_code(): Bad statement code");
9376 cs_base = frame.prev;
9380 /* Resolve initial values and make sure they are compatible with
9384 resolve_values (gfc_symbol *sym)
9388 if (sym->value == NULL)
9391 if (sym->value->expr_type == EXPR_STRUCTURE)
9392 t= resolve_structure_cons (sym->value, 1);
9394 t = gfc_resolve_expr (sym->value);
9399 gfc_check_assign_symbol (sym, sym->value);
9403 /* Verify the binding labels for common blocks that are BIND(C). The label
9404 for a BIND(C) common block must be identical in all scoping units in which
9405 the common block is declared. Further, the binding label can not collide
9406 with any other global entity in the program. */
9409 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
9411 if (comm_block_tree->n.common->is_bind_c == 1)
9413 gfc_gsymbol *binding_label_gsym;
9414 gfc_gsymbol *comm_name_gsym;
9416 /* See if a global symbol exists by the common block's name. It may
9417 be NULL if the common block is use-associated. */
9418 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
9419 comm_block_tree->n.common->name);
9420 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
9421 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
9422 "with the global entity '%s' at %L",
9423 comm_block_tree->n.common->binding_label,
9424 comm_block_tree->n.common->name,
9425 &(comm_block_tree->n.common->where),
9426 comm_name_gsym->name, &(comm_name_gsym->where));
9427 else if (comm_name_gsym != NULL
9428 && strcmp (comm_name_gsym->name,
9429 comm_block_tree->n.common->name) == 0)
9431 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
9433 if (comm_name_gsym->binding_label == NULL)
9434 /* No binding label for common block stored yet; save this one. */
9435 comm_name_gsym->binding_label =
9436 comm_block_tree->n.common->binding_label;
9438 if (strcmp (comm_name_gsym->binding_label,
9439 comm_block_tree->n.common->binding_label) != 0)
9441 /* Common block names match but binding labels do not. */
9442 gfc_error ("Binding label '%s' for common block '%s' at %L "
9443 "does not match the binding label '%s' for common "
9445 comm_block_tree->n.common->binding_label,
9446 comm_block_tree->n.common->name,
9447 &(comm_block_tree->n.common->where),
9448 comm_name_gsym->binding_label,
9449 comm_name_gsym->name,
9450 &(comm_name_gsym->where));
9455 /* There is no binding label (NAME="") so we have nothing further to
9456 check and nothing to add as a global symbol for the label. */
9457 if (comm_block_tree->n.common->binding_label[0] == '\0' )
9460 binding_label_gsym =
9461 gfc_find_gsymbol (gfc_gsym_root,
9462 comm_block_tree->n.common->binding_label);
9463 if (binding_label_gsym == NULL)
9465 /* Need to make a global symbol for the binding label to prevent
9466 it from colliding with another. */
9467 binding_label_gsym =
9468 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
9469 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
9470 binding_label_gsym->type = GSYM_COMMON;
9474 /* If comm_name_gsym is NULL, the name common block is use
9475 associated and the name could be colliding. */
9476 if (binding_label_gsym->type != GSYM_COMMON)
9477 gfc_error ("Binding label '%s' for common block '%s' at %L "
9478 "collides with the global entity '%s' at %L",
9479 comm_block_tree->n.common->binding_label,
9480 comm_block_tree->n.common->name,
9481 &(comm_block_tree->n.common->where),
9482 binding_label_gsym->name,
9483 &(binding_label_gsym->where));
9484 else if (comm_name_gsym != NULL
9485 && (strcmp (binding_label_gsym->name,
9486 comm_name_gsym->binding_label) != 0)
9487 && (strcmp (binding_label_gsym->sym_name,
9488 comm_name_gsym->name) != 0))
9489 gfc_error ("Binding label '%s' for common block '%s' at %L "
9490 "collides with global entity '%s' at %L",
9491 binding_label_gsym->name, binding_label_gsym->sym_name,
9492 &(comm_block_tree->n.common->where),
9493 comm_name_gsym->name, &(comm_name_gsym->where));
9501 /* Verify any BIND(C) derived types in the namespace so we can report errors
9502 for them once, rather than for each variable declared of that type. */
9505 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
9507 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
9508 && derived_sym->attr.is_bind_c == 1)
9509 verify_bind_c_derived_type (derived_sym);
9515 /* Verify that any binding labels used in a given namespace do not collide
9516 with the names or binding labels of any global symbols. */
9519 gfc_verify_binding_labels (gfc_symbol *sym)
9523 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
9524 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
9526 gfc_gsymbol *bind_c_sym;
9528 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
9529 if (bind_c_sym != NULL
9530 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
9532 if (sym->attr.if_source == IFSRC_DECL
9533 && (bind_c_sym->type != GSYM_SUBROUTINE
9534 && bind_c_sym->type != GSYM_FUNCTION)
9535 && ((sym->attr.contained == 1
9536 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
9537 || (sym->attr.use_assoc == 1
9538 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
9540 /* Make sure global procedures don't collide with anything. */
9541 gfc_error ("Binding label '%s' at %L collides with the global "
9542 "entity '%s' at %L", sym->binding_label,
9543 &(sym->declared_at), bind_c_sym->name,
9544 &(bind_c_sym->where));
9547 else if (sym->attr.contained == 0
9548 && (sym->attr.if_source == IFSRC_IFBODY
9549 && sym->attr.flavor == FL_PROCEDURE)
9550 && (bind_c_sym->sym_name != NULL
9551 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
9553 /* Make sure procedures in interface bodies don't collide. */
9554 gfc_error ("Binding label '%s' in interface body at %L collides "
9555 "with the global entity '%s' at %L",
9557 &(sym->declared_at), bind_c_sym->name,
9558 &(bind_c_sym->where));
9561 else if (sym->attr.contained == 0
9562 && sym->attr.if_source == IFSRC_UNKNOWN)
9563 if ((sym->attr.use_assoc && bind_c_sym->mod_name
9564 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
9565 || sym->attr.use_assoc == 0)
9567 gfc_error ("Binding label '%s' at %L collides with global "
9568 "entity '%s' at %L", sym->binding_label,
9569 &(sym->declared_at), bind_c_sym->name,
9570 &(bind_c_sym->where));
9575 /* Clear the binding label to prevent checking multiple times. */
9576 sym->binding_label[0] = '\0';
9578 else if (bind_c_sym == NULL)
9580 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
9581 bind_c_sym->where = sym->declared_at;
9582 bind_c_sym->sym_name = sym->name;
9584 if (sym->attr.use_assoc == 1)
9585 bind_c_sym->mod_name = sym->module;
9587 if (sym->ns->proc_name != NULL)
9588 bind_c_sym->mod_name = sym->ns->proc_name->name;
9590 if (sym->attr.contained == 0)
9592 if (sym->attr.subroutine)
9593 bind_c_sym->type = GSYM_SUBROUTINE;
9594 else if (sym->attr.function)
9595 bind_c_sym->type = GSYM_FUNCTION;
9603 /* Resolve an index expression. */
9606 resolve_index_expr (gfc_expr *e)
9608 if (gfc_resolve_expr (e) == FAILURE)
9611 if (gfc_simplify_expr (e, 0) == FAILURE)
9614 if (gfc_specification_expr (e) == FAILURE)
9621 /* Resolve a charlen structure. */
9624 resolve_charlen (gfc_charlen *cl)
9633 specification_expr = 1;
9635 if (resolve_index_expr (cl->length) == FAILURE)
9637 specification_expr = 0;
9641 /* "If the character length parameter value evaluates to a negative
9642 value, the length of character entities declared is zero." */
9643 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9645 if (gfc_option.warn_surprising)
9646 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9647 " the length has been set to zero",
9648 &cl->length->where, i);
9649 gfc_replace_expr (cl->length,
9650 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9653 /* Check that the character length is not too large. */
9654 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9655 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9656 && cl->length->ts.type == BT_INTEGER
9657 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9659 gfc_error ("String length at %L is too large", &cl->length->where);
9667 /* Test for non-constant shape arrays. */
9670 is_non_constant_shape_array (gfc_symbol *sym)
9676 not_constant = false;
9677 if (sym->as != NULL)
9679 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9680 has not been simplified; parameter array references. Do the
9681 simplification now. */
9682 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9684 e = sym->as->lower[i];
9685 if (e && (resolve_index_expr (e) == FAILURE
9686 || !gfc_is_constant_expr (e)))
9687 not_constant = true;
9688 e = sym->as->upper[i];
9689 if (e && (resolve_index_expr (e) == FAILURE
9690 || !gfc_is_constant_expr (e)))
9691 not_constant = true;
9694 return not_constant;
9697 /* Given a symbol and an initialization expression, add code to initialize
9698 the symbol to the function entry. */
9700 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9704 gfc_namespace *ns = sym->ns;
9706 /* Search for the function namespace if this is a contained
9707 function without an explicit result. */
9708 if (sym->attr.function && sym == sym->result
9709 && sym->name != sym->ns->proc_name->name)
9712 for (;ns; ns = ns->sibling)
9713 if (strcmp (ns->proc_name->name, sym->name) == 0)
9719 gfc_free_expr (init);
9723 /* Build an l-value expression for the result. */
9724 lval = gfc_lval_expr_from_sym (sym);
9726 /* Add the code at scope entry. */
9727 init_st = gfc_get_code ();
9728 init_st->next = ns->code;
9731 /* Assign the default initializer to the l-value. */
9732 init_st->loc = sym->declared_at;
9733 init_st->op = EXEC_INIT_ASSIGN;
9734 init_st->expr1 = lval;
9735 init_st->expr2 = init;
9738 /* Assign the default initializer to a derived type variable or result. */
9741 apply_default_init (gfc_symbol *sym)
9743 gfc_expr *init = NULL;
9745 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9748 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9749 init = gfc_default_initializer (&sym->ts);
9751 if (init == NULL && sym->ts.type != BT_CLASS)
9754 build_init_assign (sym, init);
9755 sym->attr.referenced = 1;
9758 /* Build an initializer for a local integer, real, complex, logical, or
9759 character variable, based on the command line flags finit-local-zero,
9760 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9761 null if the symbol should not have a default initialization. */
9763 build_default_init_expr (gfc_symbol *sym)
9766 gfc_expr *init_expr;
9769 /* These symbols should never have a default initialization. */
9770 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9771 || sym->attr.external
9773 || sym->attr.pointer
9774 || sym->attr.in_equivalence
9775 || sym->attr.in_common
9778 || sym->attr.cray_pointee
9779 || sym->attr.cray_pointer)
9782 /* Now we'll try to build an initializer expression. */
9783 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9786 /* We will only initialize integers, reals, complex, logicals, and
9787 characters, and only if the corresponding command-line flags
9788 were set. Otherwise, we free init_expr and return null. */
9789 switch (sym->ts.type)
9792 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9793 mpz_set_si (init_expr->value.integer,
9794 gfc_option.flag_init_integer_value);
9797 gfc_free_expr (init_expr);
9803 switch (gfc_option.flag_init_real)
9805 case GFC_INIT_REAL_SNAN:
9806 init_expr->is_snan = 1;
9808 case GFC_INIT_REAL_NAN:
9809 mpfr_set_nan (init_expr->value.real);
9812 case GFC_INIT_REAL_INF:
9813 mpfr_set_inf (init_expr->value.real, 1);
9816 case GFC_INIT_REAL_NEG_INF:
9817 mpfr_set_inf (init_expr->value.real, -1);
9820 case GFC_INIT_REAL_ZERO:
9821 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9825 gfc_free_expr (init_expr);
9832 switch (gfc_option.flag_init_real)
9834 case GFC_INIT_REAL_SNAN:
9835 init_expr->is_snan = 1;
9837 case GFC_INIT_REAL_NAN:
9838 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9839 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9842 case GFC_INIT_REAL_INF:
9843 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9844 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9847 case GFC_INIT_REAL_NEG_INF:
9848 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9849 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9852 case GFC_INIT_REAL_ZERO:
9853 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9857 gfc_free_expr (init_expr);
9864 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9865 init_expr->value.logical = 0;
9866 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9867 init_expr->value.logical = 1;
9870 gfc_free_expr (init_expr);
9876 /* For characters, the length must be constant in order to
9877 create a default initializer. */
9878 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9879 && sym->ts.u.cl->length
9880 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9882 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9883 init_expr->value.character.length = char_len;
9884 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9885 for (i = 0; i < char_len; i++)
9886 init_expr->value.character.string[i]
9887 = (unsigned char) gfc_option.flag_init_character_value;
9891 gfc_free_expr (init_expr);
9897 gfc_free_expr (init_expr);
9903 /* Add an initialization expression to a local variable. */
9905 apply_default_init_local (gfc_symbol *sym)
9907 gfc_expr *init = NULL;
9909 /* The symbol should be a variable or a function return value. */
9910 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9911 || (sym->attr.function && sym->result != sym))
9914 /* Try to build the initializer expression. If we can't initialize
9915 this symbol, then init will be NULL. */
9916 init = build_default_init_expr (sym);
9920 /* For saved variables, we don't want to add an initializer at
9921 function entry, so we just add a static initializer. */
9922 if (sym->attr.save || sym->ns->save_all
9923 || gfc_option.flag_max_stack_var_size == 0)
9925 /* Don't clobber an existing initializer! */
9926 gcc_assert (sym->value == NULL);
9931 build_init_assign (sym, init);
9935 /* Resolution of common features of flavors variable and procedure. */
9938 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9940 /* Avoid double diagnostics for function result symbols. */
9941 if ((sym->result || sym->attr.result) && !sym->attr.dummy
9942 && (sym->ns != gfc_current_ns))
9945 /* Constraints on deferred shape variable. */
9946 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9948 if (sym->attr.allocatable)
9950 if (sym->attr.dimension)
9952 gfc_error ("Allocatable array '%s' at %L must have "
9953 "a deferred shape", sym->name, &sym->declared_at);
9956 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9957 "may not be ALLOCATABLE", sym->name,
9958 &sym->declared_at) == FAILURE)
9962 if (sym->attr.pointer && sym->attr.dimension)
9964 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9965 sym->name, &sym->declared_at);
9971 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9972 && sym->ts.type != BT_CLASS && !sym->assoc)
9974 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9975 sym->name, &sym->declared_at);
9980 /* Constraints on polymorphic variables. */
9981 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9984 if (sym->attr.class_ok
9985 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9987 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9988 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9994 /* Assume that use associated symbols were checked in the module ns.
9995 Class-variables that are associate-names are also something special
9996 and excepted from the test. */
9997 if (!sym->attr.class_ok && !sym->attr.use_assoc && !sym->assoc)
9999 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
10000 "or pointer", sym->name, &sym->declared_at);
10009 /* Additional checks for symbols with flavor variable and derived
10010 type. To be called from resolve_fl_variable. */
10013 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
10015 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
10017 /* Check to see if a derived type is blocked from being host
10018 associated by the presence of another class I symbol in the same
10019 namespace. 14.6.1.3 of the standard and the discussion on
10020 comp.lang.fortran. */
10021 if (sym->ns != sym->ts.u.derived->ns
10022 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
10025 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
10026 if (s && s->attr.flavor != FL_DERIVED)
10028 gfc_error ("The type '%s' cannot be host associated at %L "
10029 "because it is blocked by an incompatible object "
10030 "of the same name declared at %L",
10031 sym->ts.u.derived->name, &sym->declared_at,
10037 /* 4th constraint in section 11.3: "If an object of a type for which
10038 component-initialization is specified (R429) appears in the
10039 specification-part of a module and does not have the ALLOCATABLE
10040 or POINTER attribute, the object shall have the SAVE attribute."
10042 The check for initializers is performed with
10043 gfc_has_default_initializer because gfc_default_initializer generates
10044 a hidden default for allocatable components. */
10045 if (!(sym->value || no_init_flag) && sym->ns->proc_name
10046 && sym->ns->proc_name->attr.flavor == FL_MODULE
10047 && !sym->ns->save_all && !sym->attr.save
10048 && !sym->attr.pointer && !sym->attr.allocatable
10049 && gfc_has_default_initializer (sym->ts.u.derived)
10050 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
10051 "module variable '%s' at %L, needed due to "
10052 "the default initialization", sym->name,
10053 &sym->declared_at) == FAILURE)
10056 /* Assign default initializer. */
10057 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
10058 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
10060 sym->value = gfc_default_initializer (&sym->ts);
10067 /* Resolve symbols with flavor variable. */
10070 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
10072 int no_init_flag, automatic_flag;
10074 const char *auto_save_msg;
10076 auto_save_msg = "Automatic object '%s' at %L cannot have the "
10079 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10082 /* Set this flag to check that variables are parameters of all entries.
10083 This check is effected by the call to gfc_resolve_expr through
10084 is_non_constant_shape_array. */
10085 specification_expr = 1;
10087 if (sym->ns->proc_name
10088 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10089 || sym->ns->proc_name->attr.is_main_program)
10090 && !sym->attr.use_assoc
10091 && !sym->attr.allocatable
10092 && !sym->attr.pointer
10093 && is_non_constant_shape_array (sym))
10095 /* The shape of a main program or module array needs to be
10097 gfc_error ("The module or main program array '%s' at %L must "
10098 "have constant shape", sym->name, &sym->declared_at);
10099 specification_expr = 0;
10103 /* Constraints on deferred type parameter. */
10104 if (sym->ts.deferred && !(sym->attr.pointer || sym->attr.allocatable))
10106 gfc_error ("Entity '%s' at %L has a deferred type parameter and "
10107 "requires either the pointer or allocatable attribute",
10108 sym->name, &sym->declared_at);
10112 if (sym->ts.type == BT_CHARACTER)
10114 /* Make sure that character string variables with assumed length are
10115 dummy arguments. */
10116 e = sym->ts.u.cl->length;
10117 if (e == NULL && !sym->attr.dummy && !sym->attr.result
10118 && !sym->ts.deferred)
10120 gfc_error ("Entity with assumed character length at %L must be a "
10121 "dummy argument or a PARAMETER", &sym->declared_at);
10125 if (e && sym->attr.save == SAVE_EXPLICIT && !gfc_is_constant_expr (e))
10127 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10131 if (!gfc_is_constant_expr (e)
10132 && !(e->expr_type == EXPR_VARIABLE
10133 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
10134 && sym->ns->proc_name
10135 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10136 || sym->ns->proc_name->attr.is_main_program)
10137 && !sym->attr.use_assoc)
10139 gfc_error ("'%s' at %L must have constant character length "
10140 "in this context", sym->name, &sym->declared_at);
10145 if (sym->value == NULL && sym->attr.referenced)
10146 apply_default_init_local (sym); /* Try to apply a default initialization. */
10148 /* Determine if the symbol may not have an initializer. */
10149 no_init_flag = automatic_flag = 0;
10150 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
10151 || sym->attr.intrinsic || sym->attr.result)
10153 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
10154 && is_non_constant_shape_array (sym))
10156 no_init_flag = automatic_flag = 1;
10158 /* Also, they must not have the SAVE attribute.
10159 SAVE_IMPLICIT is checked below. */
10160 if (sym->as && sym->attr.codimension)
10162 int corank = sym->as->corank;
10163 sym->as->corank = 0;
10164 no_init_flag = automatic_flag = is_non_constant_shape_array (sym);
10165 sym->as->corank = corank;
10167 if (automatic_flag && sym->attr.save == SAVE_EXPLICIT)
10169 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10174 /* Ensure that any initializer is simplified. */
10176 gfc_simplify_expr (sym->value, 1);
10178 /* Reject illegal initializers. */
10179 if (!sym->mark && sym->value)
10181 if (sym->attr.allocatable || (sym->ts.type == BT_CLASS
10182 && CLASS_DATA (sym)->attr.allocatable))
10183 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
10184 sym->name, &sym->declared_at);
10185 else if (sym->attr.external)
10186 gfc_error ("External '%s' at %L cannot have an initializer",
10187 sym->name, &sym->declared_at);
10188 else if (sym->attr.dummy
10189 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
10190 gfc_error ("Dummy '%s' at %L cannot have an initializer",
10191 sym->name, &sym->declared_at);
10192 else if (sym->attr.intrinsic)
10193 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
10194 sym->name, &sym->declared_at);
10195 else if (sym->attr.result)
10196 gfc_error ("Function result '%s' at %L cannot have an initializer",
10197 sym->name, &sym->declared_at);
10198 else if (automatic_flag)
10199 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
10200 sym->name, &sym->declared_at);
10202 goto no_init_error;
10207 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
10208 return resolve_fl_variable_derived (sym, no_init_flag);
10214 /* Resolve a procedure. */
10217 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
10219 gfc_formal_arglist *arg;
10221 if (sym->attr.function
10222 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10225 if (sym->ts.type == BT_CHARACTER)
10227 gfc_charlen *cl = sym->ts.u.cl;
10229 if (cl && cl->length && gfc_is_constant_expr (cl->length)
10230 && resolve_charlen (cl) == FAILURE)
10233 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10234 && sym->attr.proc == PROC_ST_FUNCTION)
10236 gfc_error ("Character-valued statement function '%s' at %L must "
10237 "have constant length", sym->name, &sym->declared_at);
10242 /* Ensure that derived type for are not of a private type. Internal
10243 module procedures are excluded by 2.2.3.3 - i.e., they are not
10244 externally accessible and can access all the objects accessible in
10246 if (!(sym->ns->parent
10247 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
10248 && gfc_check_symbol_access (sym))
10250 gfc_interface *iface;
10252 for (arg = sym->formal; arg; arg = arg->next)
10255 && arg->sym->ts.type == BT_DERIVED
10256 && !arg->sym->ts.u.derived->attr.use_assoc
10257 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10258 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
10259 "PRIVATE type and cannot be a dummy argument"
10260 " of '%s', which is PUBLIC at %L",
10261 arg->sym->name, sym->name, &sym->declared_at)
10264 /* Stop this message from recurring. */
10265 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10270 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10271 PRIVATE to the containing module. */
10272 for (iface = sym->generic; iface; iface = iface->next)
10274 for (arg = iface->sym->formal; arg; arg = arg->next)
10277 && arg->sym->ts.type == BT_DERIVED
10278 && !arg->sym->ts.u.derived->attr.use_assoc
10279 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10280 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10281 "'%s' in PUBLIC interface '%s' at %L "
10282 "takes dummy arguments of '%s' which is "
10283 "PRIVATE", iface->sym->name, sym->name,
10284 &iface->sym->declared_at,
10285 gfc_typename (&arg->sym->ts)) == FAILURE)
10287 /* Stop this message from recurring. */
10288 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10294 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10295 PRIVATE to the containing module. */
10296 for (iface = sym->generic; iface; iface = iface->next)
10298 for (arg = iface->sym->formal; arg; arg = arg->next)
10301 && arg->sym->ts.type == BT_DERIVED
10302 && !arg->sym->ts.u.derived->attr.use_assoc
10303 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10304 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10305 "'%s' in PUBLIC interface '%s' at %L "
10306 "takes dummy arguments of '%s' which is "
10307 "PRIVATE", iface->sym->name, sym->name,
10308 &iface->sym->declared_at,
10309 gfc_typename (&arg->sym->ts)) == FAILURE)
10311 /* Stop this message from recurring. */
10312 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10319 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
10320 && !sym->attr.proc_pointer)
10322 gfc_error ("Function '%s' at %L cannot have an initializer",
10323 sym->name, &sym->declared_at);
10327 /* An external symbol may not have an initializer because it is taken to be
10328 a procedure. Exception: Procedure Pointers. */
10329 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
10331 gfc_error ("External object '%s' at %L may not have an initializer",
10332 sym->name, &sym->declared_at);
10336 /* An elemental function is required to return a scalar 12.7.1 */
10337 if (sym->attr.elemental && sym->attr.function && sym->as)
10339 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
10340 "result", sym->name, &sym->declared_at);
10341 /* Reset so that the error only occurs once. */
10342 sym->attr.elemental = 0;
10346 if (sym->attr.proc == PROC_ST_FUNCTION
10347 && (sym->attr.allocatable || sym->attr.pointer))
10349 gfc_error ("Statement function '%s' at %L may not have pointer or "
10350 "allocatable attribute", sym->name, &sym->declared_at);
10354 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
10355 char-len-param shall not be array-valued, pointer-valued, recursive
10356 or pure. ....snip... A character value of * may only be used in the
10357 following ways: (i) Dummy arg of procedure - dummy associates with
10358 actual length; (ii) To declare a named constant; or (iii) External
10359 function - but length must be declared in calling scoping unit. */
10360 if (sym->attr.function
10361 && sym->ts.type == BT_CHARACTER
10362 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
10364 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
10365 || (sym->attr.recursive) || (sym->attr.pure))
10367 if (sym->as && sym->as->rank)
10368 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10369 "array-valued", sym->name, &sym->declared_at);
10371 if (sym->attr.pointer)
10372 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10373 "pointer-valued", sym->name, &sym->declared_at);
10375 if (sym->attr.pure)
10376 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10377 "pure", sym->name, &sym->declared_at);
10379 if (sym->attr.recursive)
10380 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10381 "recursive", sym->name, &sym->declared_at);
10386 /* Appendix B.2 of the standard. Contained functions give an
10387 error anyway. Fixed-form is likely to be F77/legacy. Deferred
10388 character length is an F2003 feature. */
10389 if (!sym->attr.contained
10390 && gfc_current_form != FORM_FIXED
10391 && !sym->ts.deferred)
10392 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
10393 "CHARACTER(*) function '%s' at %L",
10394 sym->name, &sym->declared_at);
10397 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
10399 gfc_formal_arglist *curr_arg;
10400 int has_non_interop_arg = 0;
10402 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10403 sym->common_block) == FAILURE)
10405 /* Clear these to prevent looking at them again if there was an
10407 sym->attr.is_bind_c = 0;
10408 sym->attr.is_c_interop = 0;
10409 sym->ts.is_c_interop = 0;
10413 /* So far, no errors have been found. */
10414 sym->attr.is_c_interop = 1;
10415 sym->ts.is_c_interop = 1;
10418 curr_arg = sym->formal;
10419 while (curr_arg != NULL)
10421 /* Skip implicitly typed dummy args here. */
10422 if (curr_arg->sym->attr.implicit_type == 0)
10423 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
10424 /* If something is found to fail, record the fact so we
10425 can mark the symbol for the procedure as not being
10426 BIND(C) to try and prevent multiple errors being
10428 has_non_interop_arg = 1;
10430 curr_arg = curr_arg->next;
10433 /* See if any of the arguments were not interoperable and if so, clear
10434 the procedure symbol to prevent duplicate error messages. */
10435 if (has_non_interop_arg != 0)
10437 sym->attr.is_c_interop = 0;
10438 sym->ts.is_c_interop = 0;
10439 sym->attr.is_bind_c = 0;
10443 if (!sym->attr.proc_pointer)
10445 if (sym->attr.save == SAVE_EXPLICIT)
10447 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
10448 "in '%s' at %L", sym->name, &sym->declared_at);
10451 if (sym->attr.intent)
10453 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
10454 "in '%s' at %L", sym->name, &sym->declared_at);
10457 if (sym->attr.subroutine && sym->attr.result)
10459 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
10460 "in '%s' at %L", sym->name, &sym->declared_at);
10463 if (sym->attr.external && sym->attr.function
10464 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
10465 || sym->attr.contained))
10467 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
10468 "in '%s' at %L", sym->name, &sym->declared_at);
10471 if (strcmp ("ppr@", sym->name) == 0)
10473 gfc_error ("Procedure pointer result '%s' at %L "
10474 "is missing the pointer attribute",
10475 sym->ns->proc_name->name, &sym->declared_at);
10484 /* Resolve a list of finalizer procedures. That is, after they have hopefully
10485 been defined and we now know their defined arguments, check that they fulfill
10486 the requirements of the standard for procedures used as finalizers. */
10489 gfc_resolve_finalizers (gfc_symbol* derived)
10491 gfc_finalizer* list;
10492 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
10493 gfc_try result = SUCCESS;
10494 bool seen_scalar = false;
10496 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
10499 /* Walk over the list of finalizer-procedures, check them, and if any one
10500 does not fit in with the standard's definition, print an error and remove
10501 it from the list. */
10502 prev_link = &derived->f2k_derived->finalizers;
10503 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
10509 /* Skip this finalizer if we already resolved it. */
10510 if (list->proc_tree)
10512 prev_link = &(list->next);
10516 /* Check this exists and is a SUBROUTINE. */
10517 if (!list->proc_sym->attr.subroutine)
10519 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
10520 list->proc_sym->name, &list->where);
10524 /* We should have exactly one argument. */
10525 if (!list->proc_sym->formal || list->proc_sym->formal->next)
10527 gfc_error ("FINAL procedure at %L must have exactly one argument",
10531 arg = list->proc_sym->formal->sym;
10533 /* This argument must be of our type. */
10534 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
10536 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
10537 &arg->declared_at, derived->name);
10541 /* It must neither be a pointer nor allocatable nor optional. */
10542 if (arg->attr.pointer)
10544 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
10545 &arg->declared_at);
10548 if (arg->attr.allocatable)
10550 gfc_error ("Argument of FINAL procedure at %L must not be"
10551 " ALLOCATABLE", &arg->declared_at);
10554 if (arg->attr.optional)
10556 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
10557 &arg->declared_at);
10561 /* It must not be INTENT(OUT). */
10562 if (arg->attr.intent == INTENT_OUT)
10564 gfc_error ("Argument of FINAL procedure at %L must not be"
10565 " INTENT(OUT)", &arg->declared_at);
10569 /* Warn if the procedure is non-scalar and not assumed shape. */
10570 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
10571 && arg->as->type != AS_ASSUMED_SHAPE)
10572 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
10573 " shape argument", &arg->declared_at);
10575 /* Check that it does not match in kind and rank with a FINAL procedure
10576 defined earlier. To really loop over the *earlier* declarations,
10577 we need to walk the tail of the list as new ones were pushed at the
10579 /* TODO: Handle kind parameters once they are implemented. */
10580 my_rank = (arg->as ? arg->as->rank : 0);
10581 for (i = list->next; i; i = i->next)
10583 /* Argument list might be empty; that is an error signalled earlier,
10584 but we nevertheless continued resolving. */
10585 if (i->proc_sym->formal)
10587 gfc_symbol* i_arg = i->proc_sym->formal->sym;
10588 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
10589 if (i_rank == my_rank)
10591 gfc_error ("FINAL procedure '%s' declared at %L has the same"
10592 " rank (%d) as '%s'",
10593 list->proc_sym->name, &list->where, my_rank,
10594 i->proc_sym->name);
10600 /* Is this the/a scalar finalizer procedure? */
10601 if (!arg->as || arg->as->rank == 0)
10602 seen_scalar = true;
10604 /* Find the symtree for this procedure. */
10605 gcc_assert (!list->proc_tree);
10606 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
10608 prev_link = &list->next;
10611 /* Remove wrong nodes immediately from the list so we don't risk any
10612 troubles in the future when they might fail later expectations. */
10616 *prev_link = list->next;
10617 gfc_free_finalizer (i);
10620 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
10621 were nodes in the list, must have been for arrays. It is surely a good
10622 idea to have a scalar version there if there's something to finalize. */
10623 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
10624 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
10625 " defined at %L, suggest also scalar one",
10626 derived->name, &derived->declared_at);
10628 /* TODO: Remove this error when finalization is finished. */
10629 gfc_error ("Finalization at %L is not yet implemented",
10630 &derived->declared_at);
10636 /* Check that it is ok for the typebound procedure proc to override the
10640 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
10643 const gfc_symbol* proc_target;
10644 const gfc_symbol* old_target;
10645 unsigned proc_pass_arg, old_pass_arg, argpos;
10646 gfc_formal_arglist* proc_formal;
10647 gfc_formal_arglist* old_formal;
10649 /* This procedure should only be called for non-GENERIC proc. */
10650 gcc_assert (!proc->n.tb->is_generic);
10652 /* If the overwritten procedure is GENERIC, this is an error. */
10653 if (old->n.tb->is_generic)
10655 gfc_error ("Can't overwrite GENERIC '%s' at %L",
10656 old->name, &proc->n.tb->where);
10660 where = proc->n.tb->where;
10661 proc_target = proc->n.tb->u.specific->n.sym;
10662 old_target = old->n.tb->u.specific->n.sym;
10664 /* Check that overridden binding is not NON_OVERRIDABLE. */
10665 if (old->n.tb->non_overridable)
10667 gfc_error ("'%s' at %L overrides a procedure binding declared"
10668 " NON_OVERRIDABLE", proc->name, &where);
10672 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
10673 if (!old->n.tb->deferred && proc->n.tb->deferred)
10675 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
10676 " non-DEFERRED binding", proc->name, &where);
10680 /* If the overridden binding is PURE, the overriding must be, too. */
10681 if (old_target->attr.pure && !proc_target->attr.pure)
10683 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
10684 proc->name, &where);
10688 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
10689 is not, the overriding must not be either. */
10690 if (old_target->attr.elemental && !proc_target->attr.elemental)
10692 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
10693 " ELEMENTAL", proc->name, &where);
10696 if (!old_target->attr.elemental && proc_target->attr.elemental)
10698 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
10699 " be ELEMENTAL, either", proc->name, &where);
10703 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
10705 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
10707 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
10708 " SUBROUTINE", proc->name, &where);
10712 /* If the overridden binding is a FUNCTION, the overriding must also be a
10713 FUNCTION and have the same characteristics. */
10714 if (old_target->attr.function)
10716 if (!proc_target->attr.function)
10718 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
10719 " FUNCTION", proc->name, &where);
10723 /* FIXME: Do more comprehensive checking (including, for instance, the
10724 rank and array-shape). */
10725 gcc_assert (proc_target->result && old_target->result);
10726 if (!gfc_compare_types (&proc_target->result->ts,
10727 &old_target->result->ts))
10729 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
10730 " matching result types", proc->name, &where);
10735 /* If the overridden binding is PUBLIC, the overriding one must not be
10737 if (old->n.tb->access == ACCESS_PUBLIC
10738 && proc->n.tb->access == ACCESS_PRIVATE)
10740 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
10741 " PRIVATE", proc->name, &where);
10745 /* Compare the formal argument lists of both procedures. This is also abused
10746 to find the position of the passed-object dummy arguments of both
10747 bindings as at least the overridden one might not yet be resolved and we
10748 need those positions in the check below. */
10749 proc_pass_arg = old_pass_arg = 0;
10750 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
10752 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
10755 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
10756 proc_formal && old_formal;
10757 proc_formal = proc_formal->next, old_formal = old_formal->next)
10759 if (proc->n.tb->pass_arg
10760 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
10761 proc_pass_arg = argpos;
10762 if (old->n.tb->pass_arg
10763 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
10764 old_pass_arg = argpos;
10766 /* Check that the names correspond. */
10767 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
10769 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
10770 " to match the corresponding argument of the overridden"
10771 " procedure", proc_formal->sym->name, proc->name, &where,
10772 old_formal->sym->name);
10776 /* Check that the types correspond if neither is the passed-object
10778 /* FIXME: Do more comprehensive testing here. */
10779 if (proc_pass_arg != argpos && old_pass_arg != argpos
10780 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10782 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10783 "in respect to the overridden procedure",
10784 proc_formal->sym->name, proc->name, &where);
10790 if (proc_formal || old_formal)
10792 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10793 " the overridden procedure", proc->name, &where);
10797 /* If the overridden binding is NOPASS, the overriding one must also be
10799 if (old->n.tb->nopass && !proc->n.tb->nopass)
10801 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10802 " NOPASS", proc->name, &where);
10806 /* If the overridden binding is PASS(x), the overriding one must also be
10807 PASS and the passed-object dummy arguments must correspond. */
10808 if (!old->n.tb->nopass)
10810 if (proc->n.tb->nopass)
10812 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10813 " PASS", proc->name, &where);
10817 if (proc_pass_arg != old_pass_arg)
10819 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10820 " the same position as the passed-object dummy argument of"
10821 " the overridden procedure", proc->name, &where);
10830 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10833 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10834 const char* generic_name, locus where)
10839 gcc_assert (t1->specific && t2->specific);
10840 gcc_assert (!t1->specific->is_generic);
10841 gcc_assert (!t2->specific->is_generic);
10843 sym1 = t1->specific->u.specific->n.sym;
10844 sym2 = t2->specific->u.specific->n.sym;
10849 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10850 if (sym1->attr.subroutine != sym2->attr.subroutine
10851 || sym1->attr.function != sym2->attr.function)
10853 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10854 " GENERIC '%s' at %L",
10855 sym1->name, sym2->name, generic_name, &where);
10859 /* Compare the interfaces. */
10860 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10862 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10863 sym1->name, sym2->name, generic_name, &where);
10871 /* Worker function for resolving a generic procedure binding; this is used to
10872 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10874 The difference between those cases is finding possible inherited bindings
10875 that are overridden, as one has to look for them in tb_sym_root,
10876 tb_uop_root or tb_op, respectively. Thus the caller must already find
10877 the super-type and set p->overridden correctly. */
10880 resolve_tb_generic_targets (gfc_symbol* super_type,
10881 gfc_typebound_proc* p, const char* name)
10883 gfc_tbp_generic* target;
10884 gfc_symtree* first_target;
10885 gfc_symtree* inherited;
10887 gcc_assert (p && p->is_generic);
10889 /* Try to find the specific bindings for the symtrees in our target-list. */
10890 gcc_assert (p->u.generic);
10891 for (target = p->u.generic; target; target = target->next)
10892 if (!target->specific)
10894 gfc_typebound_proc* overridden_tbp;
10895 gfc_tbp_generic* g;
10896 const char* target_name;
10898 target_name = target->specific_st->name;
10900 /* Defined for this type directly. */
10901 if (target->specific_st->n.tb && !target->specific_st->n.tb->error)
10903 target->specific = target->specific_st->n.tb;
10904 goto specific_found;
10907 /* Look for an inherited specific binding. */
10910 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10915 gcc_assert (inherited->n.tb);
10916 target->specific = inherited->n.tb;
10917 goto specific_found;
10921 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10922 " at %L", target_name, name, &p->where);
10925 /* Once we've found the specific binding, check it is not ambiguous with
10926 other specifics already found or inherited for the same GENERIC. */
10928 gcc_assert (target->specific);
10930 /* This must really be a specific binding! */
10931 if (target->specific->is_generic)
10933 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10934 " '%s' is GENERIC, too", name, &p->where, target_name);
10938 /* Check those already resolved on this type directly. */
10939 for (g = p->u.generic; g; g = g->next)
10940 if (g != target && g->specific
10941 && check_generic_tbp_ambiguity (target, g, name, p->where)
10945 /* Check for ambiguity with inherited specific targets. */
10946 for (overridden_tbp = p->overridden; overridden_tbp;
10947 overridden_tbp = overridden_tbp->overridden)
10948 if (overridden_tbp->is_generic)
10950 for (g = overridden_tbp->u.generic; g; g = g->next)
10952 gcc_assert (g->specific);
10953 if (check_generic_tbp_ambiguity (target, g,
10954 name, p->where) == FAILURE)
10960 /* If we attempt to "overwrite" a specific binding, this is an error. */
10961 if (p->overridden && !p->overridden->is_generic)
10963 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10964 " the same name", name, &p->where);
10968 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10969 all must have the same attributes here. */
10970 first_target = p->u.generic->specific->u.specific;
10971 gcc_assert (first_target);
10972 p->subroutine = first_target->n.sym->attr.subroutine;
10973 p->function = first_target->n.sym->attr.function;
10979 /* Resolve a GENERIC procedure binding for a derived type. */
10982 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10984 gfc_symbol* super_type;
10986 /* Find the overridden binding if any. */
10987 st->n.tb->overridden = NULL;
10988 super_type = gfc_get_derived_super_type (derived);
10991 gfc_symtree* overridden;
10992 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10995 if (overridden && overridden->n.tb)
10996 st->n.tb->overridden = overridden->n.tb;
10999 /* Resolve using worker function. */
11000 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
11004 /* Retrieve the target-procedure of an operator binding and do some checks in
11005 common for intrinsic and user-defined type-bound operators. */
11008 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
11010 gfc_symbol* target_proc;
11012 gcc_assert (target->specific && !target->specific->is_generic);
11013 target_proc = target->specific->u.specific->n.sym;
11014 gcc_assert (target_proc);
11016 /* All operator bindings must have a passed-object dummy argument. */
11017 if (target->specific->nopass)
11019 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
11023 return target_proc;
11027 /* Resolve a type-bound intrinsic operator. */
11030 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
11031 gfc_typebound_proc* p)
11033 gfc_symbol* super_type;
11034 gfc_tbp_generic* target;
11036 /* If there's already an error here, do nothing (but don't fail again). */
11040 /* Operators should always be GENERIC bindings. */
11041 gcc_assert (p->is_generic);
11043 /* Look for an overridden binding. */
11044 super_type = gfc_get_derived_super_type (derived);
11045 if (super_type && super_type->f2k_derived)
11046 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
11049 p->overridden = NULL;
11051 /* Resolve general GENERIC properties using worker function. */
11052 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
11055 /* Check the targets to be procedures of correct interface. */
11056 for (target = p->u.generic; target; target = target->next)
11058 gfc_symbol* target_proc;
11060 target_proc = get_checked_tb_operator_target (target, p->where);
11064 if (!gfc_check_operator_interface (target_proc, op, p->where))
11076 /* Resolve a type-bound user operator (tree-walker callback). */
11078 static gfc_symbol* resolve_bindings_derived;
11079 static gfc_try resolve_bindings_result;
11081 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
11084 resolve_typebound_user_op (gfc_symtree* stree)
11086 gfc_symbol* super_type;
11087 gfc_tbp_generic* target;
11089 gcc_assert (stree && stree->n.tb);
11091 if (stree->n.tb->error)
11094 /* Operators should always be GENERIC bindings. */
11095 gcc_assert (stree->n.tb->is_generic);
11097 /* Find overridden procedure, if any. */
11098 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11099 if (super_type && super_type->f2k_derived)
11101 gfc_symtree* overridden;
11102 overridden = gfc_find_typebound_user_op (super_type, NULL,
11103 stree->name, true, NULL);
11105 if (overridden && overridden->n.tb)
11106 stree->n.tb->overridden = overridden->n.tb;
11109 stree->n.tb->overridden = NULL;
11111 /* Resolve basically using worker function. */
11112 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
11116 /* Check the targets to be functions of correct interface. */
11117 for (target = stree->n.tb->u.generic; target; target = target->next)
11119 gfc_symbol* target_proc;
11121 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
11125 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
11132 resolve_bindings_result = FAILURE;
11133 stree->n.tb->error = 1;
11137 /* Resolve the type-bound procedures for a derived type. */
11140 resolve_typebound_procedure (gfc_symtree* stree)
11144 gfc_symbol* me_arg;
11145 gfc_symbol* super_type;
11146 gfc_component* comp;
11148 gcc_assert (stree);
11150 /* Undefined specific symbol from GENERIC target definition. */
11154 if (stree->n.tb->error)
11157 /* If this is a GENERIC binding, use that routine. */
11158 if (stree->n.tb->is_generic)
11160 if (resolve_typebound_generic (resolve_bindings_derived, stree)
11166 /* Get the target-procedure to check it. */
11167 gcc_assert (!stree->n.tb->is_generic);
11168 gcc_assert (stree->n.tb->u.specific);
11169 proc = stree->n.tb->u.specific->n.sym;
11170 where = stree->n.tb->where;
11172 /* Default access should already be resolved from the parser. */
11173 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
11175 /* It should be a module procedure or an external procedure with explicit
11176 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
11177 if ((!proc->attr.subroutine && !proc->attr.function)
11178 || (proc->attr.proc != PROC_MODULE
11179 && proc->attr.if_source != IFSRC_IFBODY)
11180 || (proc->attr.abstract && !stree->n.tb->deferred))
11182 gfc_error ("'%s' must be a module procedure or an external procedure with"
11183 " an explicit interface at %L", proc->name, &where);
11186 stree->n.tb->subroutine = proc->attr.subroutine;
11187 stree->n.tb->function = proc->attr.function;
11189 /* Find the super-type of the current derived type. We could do this once and
11190 store in a global if speed is needed, but as long as not I believe this is
11191 more readable and clearer. */
11192 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11194 /* If PASS, resolve and check arguments if not already resolved / loaded
11195 from a .mod file. */
11196 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
11198 if (stree->n.tb->pass_arg)
11200 gfc_formal_arglist* i;
11202 /* If an explicit passing argument name is given, walk the arg-list
11203 and look for it. */
11206 stree->n.tb->pass_arg_num = 1;
11207 for (i = proc->formal; i; i = i->next)
11209 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
11214 ++stree->n.tb->pass_arg_num;
11219 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
11221 proc->name, stree->n.tb->pass_arg, &where,
11222 stree->n.tb->pass_arg);
11228 /* Otherwise, take the first one; there should in fact be at least
11230 stree->n.tb->pass_arg_num = 1;
11233 gfc_error ("Procedure '%s' with PASS at %L must have at"
11234 " least one argument", proc->name, &where);
11237 me_arg = proc->formal->sym;
11240 /* Now check that the argument-type matches and the passed-object
11241 dummy argument is generally fine. */
11243 gcc_assert (me_arg);
11245 if (me_arg->ts.type != BT_CLASS)
11247 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11248 " at %L", proc->name, &where);
11252 if (CLASS_DATA (me_arg)->ts.u.derived
11253 != resolve_bindings_derived)
11255 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11256 " the derived-type '%s'", me_arg->name, proc->name,
11257 me_arg->name, &where, resolve_bindings_derived->name);
11261 gcc_assert (me_arg->ts.type == BT_CLASS);
11262 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
11264 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
11265 " scalar", proc->name, &where);
11268 if (CLASS_DATA (me_arg)->attr.allocatable)
11270 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11271 " be ALLOCATABLE", proc->name, &where);
11274 if (CLASS_DATA (me_arg)->attr.class_pointer)
11276 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11277 " be POINTER", proc->name, &where);
11282 /* If we are extending some type, check that we don't override a procedure
11283 flagged NON_OVERRIDABLE. */
11284 stree->n.tb->overridden = NULL;
11287 gfc_symtree* overridden;
11288 overridden = gfc_find_typebound_proc (super_type, NULL,
11289 stree->name, true, NULL);
11291 if (overridden && overridden->n.tb)
11292 stree->n.tb->overridden = overridden->n.tb;
11294 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
11298 /* See if there's a name collision with a component directly in this type. */
11299 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
11300 if (!strcmp (comp->name, stree->name))
11302 gfc_error ("Procedure '%s' at %L has the same name as a component of"
11304 stree->name, &where, resolve_bindings_derived->name);
11308 /* Try to find a name collision with an inherited component. */
11309 if (super_type && gfc_find_component (super_type, stree->name, true, true))
11311 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
11312 " component of '%s'",
11313 stree->name, &where, resolve_bindings_derived->name);
11317 stree->n.tb->error = 0;
11321 resolve_bindings_result = FAILURE;
11322 stree->n.tb->error = 1;
11327 resolve_typebound_procedures (gfc_symbol* derived)
11331 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
11334 resolve_bindings_derived = derived;
11335 resolve_bindings_result = SUCCESS;
11337 /* Make sure the vtab has been generated. */
11338 gfc_find_derived_vtab (derived);
11340 if (derived->f2k_derived->tb_sym_root)
11341 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
11342 &resolve_typebound_procedure);
11344 if (derived->f2k_derived->tb_uop_root)
11345 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
11346 &resolve_typebound_user_op);
11348 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
11350 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
11351 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
11353 resolve_bindings_result = FAILURE;
11356 return resolve_bindings_result;
11360 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
11361 to give all identical derived types the same backend_decl. */
11363 add_dt_to_dt_list (gfc_symbol *derived)
11365 gfc_dt_list *dt_list;
11367 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
11368 if (derived == dt_list->derived)
11371 dt_list = gfc_get_dt_list ();
11372 dt_list->next = gfc_derived_types;
11373 dt_list->derived = derived;
11374 gfc_derived_types = dt_list;
11378 /* Ensure that a derived-type is really not abstract, meaning that every
11379 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
11382 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
11387 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
11389 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
11392 if (st->n.tb && st->n.tb->deferred)
11394 gfc_symtree* overriding;
11395 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
11398 gcc_assert (overriding->n.tb);
11399 if (overriding->n.tb->deferred)
11401 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
11402 " '%s' is DEFERRED and not overridden",
11403 sub->name, &sub->declared_at, st->name);
11412 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
11414 /* The algorithm used here is to recursively travel up the ancestry of sub
11415 and for each ancestor-type, check all bindings. If any of them is
11416 DEFERRED, look it up starting from sub and see if the found (overriding)
11417 binding is not DEFERRED.
11418 This is not the most efficient way to do this, but it should be ok and is
11419 clearer than something sophisticated. */
11421 gcc_assert (ancestor && !sub->attr.abstract);
11423 if (!ancestor->attr.abstract)
11426 /* Walk bindings of this ancestor. */
11427 if (ancestor->f2k_derived)
11430 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
11435 /* Find next ancestor type and recurse on it. */
11436 ancestor = gfc_get_derived_super_type (ancestor);
11438 return ensure_not_abstract (sub, ancestor);
11444 /* Resolve the components of a derived type. */
11447 resolve_fl_derived (gfc_symbol *sym)
11449 gfc_symbol* super_type;
11452 super_type = gfc_get_derived_super_type (sym);
11454 if (sym->attr.is_class && sym->ts.u.derived == NULL)
11456 /* Fix up incomplete CLASS symbols. */
11457 gfc_component *data = gfc_find_component (sym, "_data", true, true);
11458 gfc_component *vptr = gfc_find_component (sym, "_vptr", true, true);
11459 if (vptr->ts.u.derived == NULL)
11461 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
11463 vptr->ts.u.derived = vtab->ts.u.derived;
11468 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
11470 gfc_error ("As extending type '%s' at %L has a coarray component, "
11471 "parent type '%s' shall also have one", sym->name,
11472 &sym->declared_at, super_type->name);
11476 /* Ensure the extended type gets resolved before we do. */
11477 if (super_type && resolve_fl_derived (super_type) == FAILURE)
11480 /* An ABSTRACT type must be extensible. */
11481 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
11483 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
11484 sym->name, &sym->declared_at);
11488 for (c = sym->components; c != NULL; c = c->next)
11491 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
11492 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
11494 gfc_error ("Coarray component '%s' at %L must be allocatable with "
11495 "deferred shape", c->name, &c->loc);
11500 if (c->attr.codimension && c->ts.type == BT_DERIVED
11501 && c->ts.u.derived->ts.is_iso_c)
11503 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11504 "shall not be a coarray", c->name, &c->loc);
11509 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
11510 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
11511 || c->attr.allocatable))
11513 gfc_error ("Component '%s' at %L with coarray component "
11514 "shall be a nonpointer, nonallocatable scalar",
11520 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
11522 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
11523 "is not an array pointer", c->name, &c->loc);
11527 if (c->attr.proc_pointer && c->ts.interface)
11529 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
11530 gfc_error ("Interface '%s', used by procedure pointer component "
11531 "'%s' at %L, is declared in a later PROCEDURE statement",
11532 c->ts.interface->name, c->name, &c->loc);
11534 /* Get the attributes from the interface (now resolved). */
11535 if (c->ts.interface->attr.if_source
11536 || c->ts.interface->attr.intrinsic)
11538 gfc_symbol *ifc = c->ts.interface;
11540 if (ifc->formal && !ifc->formal_ns)
11541 resolve_symbol (ifc);
11543 if (ifc->attr.intrinsic)
11544 resolve_intrinsic (ifc, &ifc->declared_at);
11548 c->ts = ifc->result->ts;
11549 c->attr.allocatable = ifc->result->attr.allocatable;
11550 c->attr.pointer = ifc->result->attr.pointer;
11551 c->attr.dimension = ifc->result->attr.dimension;
11552 c->as = gfc_copy_array_spec (ifc->result->as);
11557 c->attr.allocatable = ifc->attr.allocatable;
11558 c->attr.pointer = ifc->attr.pointer;
11559 c->attr.dimension = ifc->attr.dimension;
11560 c->as = gfc_copy_array_spec (ifc->as);
11562 c->ts.interface = ifc;
11563 c->attr.function = ifc->attr.function;
11564 c->attr.subroutine = ifc->attr.subroutine;
11565 gfc_copy_formal_args_ppc (c, ifc);
11567 c->attr.pure = ifc->attr.pure;
11568 c->attr.elemental = ifc->attr.elemental;
11569 c->attr.recursive = ifc->attr.recursive;
11570 c->attr.always_explicit = ifc->attr.always_explicit;
11571 c->attr.ext_attr |= ifc->attr.ext_attr;
11572 /* Replace symbols in array spec. */
11576 for (i = 0; i < c->as->rank; i++)
11578 gfc_expr_replace_comp (c->as->lower[i], c);
11579 gfc_expr_replace_comp (c->as->upper[i], c);
11582 /* Copy char length. */
11583 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11585 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11586 gfc_expr_replace_comp (cl->length, c);
11587 if (cl->length && !cl->resolved
11588 && gfc_resolve_expr (cl->length) == FAILURE)
11593 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
11595 gfc_error ("Interface '%s' of procedure pointer component "
11596 "'%s' at %L must be explicit", c->ts.interface->name,
11601 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
11603 /* Since PPCs are not implicitly typed, a PPC without an explicit
11604 interface must be a subroutine. */
11605 gfc_add_subroutine (&c->attr, c->name, &c->loc);
11608 /* Procedure pointer components: Check PASS arg. */
11609 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
11610 && !sym->attr.vtype)
11612 gfc_symbol* me_arg;
11614 if (c->tb->pass_arg)
11616 gfc_formal_arglist* i;
11618 /* If an explicit passing argument name is given, walk the arg-list
11619 and look for it. */
11622 c->tb->pass_arg_num = 1;
11623 for (i = c->formal; i; i = i->next)
11625 if (!strcmp (i->sym->name, c->tb->pass_arg))
11630 c->tb->pass_arg_num++;
11635 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11636 "at %L has no argument '%s'", c->name,
11637 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11644 /* Otherwise, take the first one; there should in fact be at least
11646 c->tb->pass_arg_num = 1;
11649 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11650 "must have at least one argument",
11655 me_arg = c->formal->sym;
11658 /* Now check that the argument-type matches. */
11659 gcc_assert (me_arg);
11660 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11661 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11662 || (me_arg->ts.type == BT_CLASS
11663 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11665 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11666 " the derived type '%s'", me_arg->name, c->name,
11667 me_arg->name, &c->loc, sym->name);
11672 /* Check for C453. */
11673 if (me_arg->attr.dimension)
11675 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11676 "must be scalar", me_arg->name, c->name, me_arg->name,
11682 if (me_arg->attr.pointer)
11684 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11685 "may not have the POINTER attribute", me_arg->name,
11686 c->name, me_arg->name, &c->loc);
11691 if (me_arg->attr.allocatable)
11693 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11694 "may not be ALLOCATABLE", me_arg->name, c->name,
11695 me_arg->name, &c->loc);
11700 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11701 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11702 " at %L", c->name, &c->loc);
11706 /* Check type-spec if this is not the parent-type component. */
11707 if ((!sym->attr.extension || c != sym->components) && !sym->attr.vtype
11708 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11711 /* If this type is an extension, set the accessibility of the parent
11713 if (super_type && c == sym->components
11714 && strcmp (super_type->name, c->name) == 0)
11715 c->attr.access = super_type->attr.access;
11717 /* If this type is an extension, see if this component has the same name
11718 as an inherited type-bound procedure. */
11719 if (super_type && !sym->attr.is_class
11720 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11722 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11723 " inherited type-bound procedure",
11724 c->name, sym->name, &c->loc);
11728 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer
11729 && !c->ts.deferred)
11731 if (c->ts.u.cl->length == NULL
11732 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11733 || !gfc_is_constant_expr (c->ts.u.cl->length))
11735 gfc_error ("Character length of component '%s' needs to "
11736 "be a constant specification expression at %L",
11738 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11743 if (c->ts.type == BT_CHARACTER && c->ts.deferred
11744 && !c->attr.pointer && !c->attr.allocatable)
11746 gfc_error ("Character component '%s' of '%s' at %L with deferred "
11747 "length must be a POINTER or ALLOCATABLE",
11748 c->name, sym->name, &c->loc);
11752 if (c->ts.type == BT_DERIVED
11753 && sym->component_access != ACCESS_PRIVATE
11754 && gfc_check_symbol_access (sym)
11755 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11756 && !c->ts.u.derived->attr.use_assoc
11757 && !gfc_check_symbol_access (c->ts.u.derived)
11758 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11759 "is a PRIVATE type and cannot be a component of "
11760 "'%s', which is PUBLIC at %L", c->name,
11761 sym->name, &sym->declared_at) == FAILURE)
11764 if ((sym->attr.sequence || sym->attr.is_bind_c) && c->ts.type == BT_CLASS)
11766 gfc_error ("Polymorphic component %s at %L in SEQUENCE or BIND(C) "
11767 "type %s", c->name, &c->loc, sym->name);
11771 if (sym->attr.sequence)
11773 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11775 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11776 "not have the SEQUENCE attribute",
11777 c->ts.u.derived->name, &sym->declared_at);
11782 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && !sym->attr.vtype
11783 && c->attr.pointer && c->ts.u.derived->components == NULL
11784 && !c->ts.u.derived->attr.zero_comp)
11786 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11787 "that has not been declared", c->name, sym->name,
11792 if (c->ts.type == BT_CLASS && c->attr.class_ok
11793 && CLASS_DATA (c)->attr.class_pointer
11794 && CLASS_DATA (c)->ts.u.derived->components == NULL
11795 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11797 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11798 "that has not been declared", c->name, sym->name,
11804 if (c->ts.type == BT_CLASS && c->attr.flavor != FL_PROCEDURE
11805 && (!c->attr.class_ok
11806 || !(CLASS_DATA (c)->attr.class_pointer
11807 || CLASS_DATA (c)->attr.allocatable)))
11809 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11810 "or pointer", c->name, &c->loc);
11814 /* Ensure that all the derived type components are put on the
11815 derived type list; even in formal namespaces, where derived type
11816 pointer components might not have been declared. */
11817 if (c->ts.type == BT_DERIVED
11819 && c->ts.u.derived->components
11821 && sym != c->ts.u.derived)
11822 add_dt_to_dt_list (c->ts.u.derived);
11824 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11825 || c->attr.proc_pointer
11826 || c->attr.allocatable)) == FAILURE)
11830 /* Resolve the type-bound procedures. */
11831 if (resolve_typebound_procedures (sym) == FAILURE)
11834 /* Resolve the finalizer procedures. */
11835 if (gfc_resolve_finalizers (sym) == FAILURE)
11838 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11839 all DEFERRED bindings are overridden. */
11840 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11841 && !sym->attr.is_class
11842 && ensure_not_abstract (sym, super_type) == FAILURE)
11845 /* Add derived type to the derived type list. */
11846 add_dt_to_dt_list (sym);
11853 resolve_fl_namelist (gfc_symbol *sym)
11858 for (nl = sym->namelist; nl; nl = nl->next)
11860 /* Check again, the check in match only works if NAMELIST comes
11862 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SIZE)
11864 gfc_error ("Assumed size array '%s' in namelist '%s' at %L is not "
11865 "allowed", nl->sym->name, sym->name, &sym->declared_at);
11869 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11870 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11871 "object '%s' with assumed shape in namelist "
11872 "'%s' at %L", nl->sym->name, sym->name,
11873 &sym->declared_at) == FAILURE)
11876 if (is_non_constant_shape_array (nl->sym)
11877 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11878 "object '%s' with nonconstant shape in namelist "
11879 "'%s' at %L", nl->sym->name, sym->name,
11880 &sym->declared_at) == FAILURE)
11883 if (nl->sym->ts.type == BT_CHARACTER
11884 && (nl->sym->ts.u.cl->length == NULL
11885 || !gfc_is_constant_expr (nl->sym->ts.u.cl->length))
11886 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11887 "'%s' with nonconstant character length in "
11888 "namelist '%s' at %L", nl->sym->name, sym->name,
11889 &sym->declared_at) == FAILURE)
11892 /* FIXME: Once UDDTIO is implemented, the following can be
11894 if (nl->sym->ts.type == BT_CLASS)
11896 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L is "
11897 "polymorphic and requires a defined input/output "
11898 "procedure", nl->sym->name, sym->name, &sym->declared_at);
11902 if (nl->sym->ts.type == BT_DERIVED
11903 && (nl->sym->ts.u.derived->attr.alloc_comp
11904 || nl->sym->ts.u.derived->attr.pointer_comp))
11906 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11907 "'%s' in namelist '%s' at %L with ALLOCATABLE "
11908 "or POINTER components", nl->sym->name,
11909 sym->name, &sym->declared_at) == FAILURE)
11912 /* FIXME: Once UDDTIO is implemented, the following can be
11914 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L has "
11915 "ALLOCATABLE or POINTER components and thus requires "
11916 "a defined input/output procedure", nl->sym->name,
11917 sym->name, &sym->declared_at);
11922 /* Reject PRIVATE objects in a PUBLIC namelist. */
11923 if (gfc_check_symbol_access (sym))
11925 for (nl = sym->namelist; nl; nl = nl->next)
11927 if (!nl->sym->attr.use_assoc
11928 && !is_sym_host_assoc (nl->sym, sym->ns)
11929 && !gfc_check_symbol_access (nl->sym))
11931 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11932 "cannot be member of PUBLIC namelist '%s' at %L",
11933 nl->sym->name, sym->name, &sym->declared_at);
11937 /* Types with private components that came here by USE-association. */
11938 if (nl->sym->ts.type == BT_DERIVED
11939 && derived_inaccessible (nl->sym->ts.u.derived))
11941 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11942 "components and cannot be member of namelist '%s' at %L",
11943 nl->sym->name, sym->name, &sym->declared_at);
11947 /* Types with private components that are defined in the same module. */
11948 if (nl->sym->ts.type == BT_DERIVED
11949 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11950 && nl->sym->ts.u.derived->attr.private_comp)
11952 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11953 "cannot be a member of PUBLIC namelist '%s' at %L",
11954 nl->sym->name, sym->name, &sym->declared_at);
11961 /* 14.1.2 A module or internal procedure represent local entities
11962 of the same type as a namelist member and so are not allowed. */
11963 for (nl = sym->namelist; nl; nl = nl->next)
11965 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11968 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11969 if ((nl->sym == sym->ns->proc_name)
11971 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11975 if (nl->sym && nl->sym->name)
11976 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11977 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11979 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11980 "attribute in '%s' at %L", nlsym->name,
11981 &sym->declared_at);
11991 resolve_fl_parameter (gfc_symbol *sym)
11993 /* A parameter array's shape needs to be constant. */
11994 if (sym->as != NULL
11995 && (sym->as->type == AS_DEFERRED
11996 || is_non_constant_shape_array (sym)))
11998 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11999 "or of deferred shape", sym->name, &sym->declared_at);
12003 /* Make sure a parameter that has been implicitly typed still
12004 matches the implicit type, since PARAMETER statements can precede
12005 IMPLICIT statements. */
12006 if (sym->attr.implicit_type
12007 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
12010 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
12011 "later IMPLICIT type", sym->name, &sym->declared_at);
12015 /* Make sure the types of derived parameters are consistent. This
12016 type checking is deferred until resolution because the type may
12017 refer to a derived type from the host. */
12018 if (sym->ts.type == BT_DERIVED
12019 && !gfc_compare_types (&sym->ts, &sym->value->ts))
12021 gfc_error ("Incompatible derived type in PARAMETER at %L",
12022 &sym->value->where);
12029 /* Do anything necessary to resolve a symbol. Right now, we just
12030 assume that an otherwise unknown symbol is a variable. This sort
12031 of thing commonly happens for symbols in module. */
12034 resolve_symbol (gfc_symbol *sym)
12036 int check_constant, mp_flag;
12037 gfc_symtree *symtree;
12038 gfc_symtree *this_symtree;
12042 if (sym->attr.flavor == FL_UNKNOWN)
12045 /* If we find that a flavorless symbol is an interface in one of the
12046 parent namespaces, find its symtree in this namespace, free the
12047 symbol and set the symtree to point to the interface symbol. */
12048 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
12050 symtree = gfc_find_symtree (ns->sym_root, sym->name);
12051 if (symtree && (symtree->n.sym->generic ||
12052 (symtree->n.sym->attr.flavor == FL_PROCEDURE
12053 && sym->ns->construct_entities)))
12055 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
12057 gfc_release_symbol (sym);
12058 symtree->n.sym->refs++;
12059 this_symtree->n.sym = symtree->n.sym;
12064 /* Otherwise give it a flavor according to such attributes as
12066 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
12067 sym->attr.flavor = FL_VARIABLE;
12070 sym->attr.flavor = FL_PROCEDURE;
12071 if (sym->attr.dimension)
12072 sym->attr.function = 1;
12076 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
12077 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
12079 if (sym->attr.procedure && sym->ts.interface
12080 && sym->attr.if_source != IFSRC_DECL
12081 && resolve_procedure_interface (sym) == FAILURE)
12084 if (sym->attr.is_protected && !sym->attr.proc_pointer
12085 && (sym->attr.procedure || sym->attr.external))
12087 if (sym->attr.external)
12088 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
12089 "at %L", &sym->declared_at);
12091 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
12092 "at %L", &sym->declared_at);
12099 if (sym->attr.contiguous
12100 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
12101 && !sym->attr.pointer)))
12103 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
12104 "array pointer or an assumed-shape array", sym->name,
12105 &sym->declared_at);
12109 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
12112 /* Symbols that are module procedures with results (functions) have
12113 the types and array specification copied for type checking in
12114 procedures that call them, as well as for saving to a module
12115 file. These symbols can't stand the scrutiny that their results
12117 mp_flag = (sym->result != NULL && sym->result != sym);
12119 /* Make sure that the intrinsic is consistent with its internal
12120 representation. This needs to be done before assigning a default
12121 type to avoid spurious warnings. */
12122 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
12123 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
12126 /* Resolve associate names. */
12128 resolve_assoc_var (sym, true);
12130 /* Assign default type to symbols that need one and don't have one. */
12131 if (sym->ts.type == BT_UNKNOWN)
12133 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
12134 gfc_set_default_type (sym, 1, NULL);
12136 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
12137 && !sym->attr.function && !sym->attr.subroutine
12138 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
12139 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
12141 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12143 /* The specific case of an external procedure should emit an error
12144 in the case that there is no implicit type. */
12146 gfc_set_default_type (sym, sym->attr.external, NULL);
12149 /* Result may be in another namespace. */
12150 resolve_symbol (sym->result);
12152 if (!sym->result->attr.proc_pointer)
12154 sym->ts = sym->result->ts;
12155 sym->as = gfc_copy_array_spec (sym->result->as);
12156 sym->attr.dimension = sym->result->attr.dimension;
12157 sym->attr.pointer = sym->result->attr.pointer;
12158 sym->attr.allocatable = sym->result->attr.allocatable;
12159 sym->attr.contiguous = sym->result->attr.contiguous;
12165 /* Assumed size arrays and assumed shape arrays must be dummy
12166 arguments. Array-spec's of implied-shape should have been resolved to
12167 AS_EXPLICIT already. */
12171 gcc_assert (sym->as->type != AS_IMPLIED_SHAPE);
12172 if (((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
12173 || sym->as->type == AS_ASSUMED_SHAPE)
12174 && sym->attr.dummy == 0)
12176 if (sym->as->type == AS_ASSUMED_SIZE)
12177 gfc_error ("Assumed size array at %L must be a dummy argument",
12178 &sym->declared_at);
12180 gfc_error ("Assumed shape array at %L must be a dummy argument",
12181 &sym->declared_at);
12186 /* Make sure symbols with known intent or optional are really dummy
12187 variable. Because of ENTRY statement, this has to be deferred
12188 until resolution time. */
12190 if (!sym->attr.dummy
12191 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
12193 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
12197 if (sym->attr.value && !sym->attr.dummy)
12199 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
12200 "it is not a dummy argument", sym->name, &sym->declared_at);
12204 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
12206 gfc_charlen *cl = sym->ts.u.cl;
12207 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
12209 gfc_error ("Character dummy variable '%s' at %L with VALUE "
12210 "attribute must have constant length",
12211 sym->name, &sym->declared_at);
12215 if (sym->ts.is_c_interop
12216 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
12218 gfc_error ("C interoperable character dummy variable '%s' at %L "
12219 "with VALUE attribute must have length one",
12220 sym->name, &sym->declared_at);
12225 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
12226 do this for something that was implicitly typed because that is handled
12227 in gfc_set_default_type. Handle dummy arguments and procedure
12228 definitions separately. Also, anything that is use associated is not
12229 handled here but instead is handled in the module it is declared in.
12230 Finally, derived type definitions are allowed to be BIND(C) since that
12231 only implies that they're interoperable, and they are checked fully for
12232 interoperability when a variable is declared of that type. */
12233 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
12234 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
12235 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
12237 gfc_try t = SUCCESS;
12239 /* First, make sure the variable is declared at the
12240 module-level scope (J3/04-007, Section 15.3). */
12241 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
12242 sym->attr.in_common == 0)
12244 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
12245 "is neither a COMMON block nor declared at the "
12246 "module level scope", sym->name, &(sym->declared_at));
12249 else if (sym->common_head != NULL)
12251 t = verify_com_block_vars_c_interop (sym->common_head);
12255 /* If type() declaration, we need to verify that the components
12256 of the given type are all C interoperable, etc. */
12257 if (sym->ts.type == BT_DERIVED &&
12258 sym->ts.u.derived->attr.is_c_interop != 1)
12260 /* Make sure the user marked the derived type as BIND(C). If
12261 not, call the verify routine. This could print an error
12262 for the derived type more than once if multiple variables
12263 of that type are declared. */
12264 if (sym->ts.u.derived->attr.is_bind_c != 1)
12265 verify_bind_c_derived_type (sym->ts.u.derived);
12269 /* Verify the variable itself as C interoperable if it
12270 is BIND(C). It is not possible for this to succeed if
12271 the verify_bind_c_derived_type failed, so don't have to handle
12272 any error returned by verify_bind_c_derived_type. */
12273 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
12274 sym->common_block);
12279 /* clear the is_bind_c flag to prevent reporting errors more than
12280 once if something failed. */
12281 sym->attr.is_bind_c = 0;
12286 /* If a derived type symbol has reached this point, without its
12287 type being declared, we have an error. Notice that most
12288 conditions that produce undefined derived types have already
12289 been dealt with. However, the likes of:
12290 implicit type(t) (t) ..... call foo (t) will get us here if
12291 the type is not declared in the scope of the implicit
12292 statement. Change the type to BT_UNKNOWN, both because it is so
12293 and to prevent an ICE. */
12294 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
12295 && !sym->ts.u.derived->attr.zero_comp)
12297 gfc_error ("The derived type '%s' at %L is of type '%s', "
12298 "which has not been defined", sym->name,
12299 &sym->declared_at, sym->ts.u.derived->name);
12300 sym->ts.type = BT_UNKNOWN;
12304 /* Make sure that the derived type has been resolved and that the
12305 derived type is visible in the symbol's namespace, if it is a
12306 module function and is not PRIVATE. */
12307 if (sym->ts.type == BT_DERIVED
12308 && sym->ts.u.derived->attr.use_assoc
12309 && sym->ns->proc_name
12310 && sym->ns->proc_name->attr.flavor == FL_MODULE)
12314 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
12317 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
12318 if (!ds && sym->attr.function && gfc_check_symbol_access (sym))
12320 symtree = gfc_new_symtree (&sym->ns->sym_root,
12321 sym->ts.u.derived->name);
12322 symtree->n.sym = sym->ts.u.derived;
12323 sym->ts.u.derived->refs++;
12327 /* Unless the derived-type declaration is use associated, Fortran 95
12328 does not allow public entries of private derived types.
12329 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
12330 161 in 95-006r3. */
12331 if (sym->ts.type == BT_DERIVED
12332 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
12333 && !sym->ts.u.derived->attr.use_assoc
12334 && gfc_check_symbol_access (sym)
12335 && !gfc_check_symbol_access (sym->ts.u.derived)
12336 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
12337 "of PRIVATE derived type '%s'",
12338 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
12339 : "variable", sym->name, &sym->declared_at,
12340 sym->ts.u.derived->name) == FAILURE)
12343 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
12344 default initialization is defined (5.1.2.4.4). */
12345 if (sym->ts.type == BT_DERIVED
12347 && sym->attr.intent == INTENT_OUT
12349 && sym->as->type == AS_ASSUMED_SIZE)
12351 for (c = sym->ts.u.derived->components; c; c = c->next)
12353 if (c->initializer)
12355 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
12356 "ASSUMED SIZE and so cannot have a default initializer",
12357 sym->name, &sym->declared_at);
12364 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12365 || sym->attr.codimension)
12366 && sym->attr.result)
12367 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
12368 "a coarray component", sym->name, &sym->declared_at);
12371 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
12372 && sym->ts.u.derived->ts.is_iso_c)
12373 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
12374 "shall not be a coarray", sym->name, &sym->declared_at);
12377 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
12378 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
12379 || sym->attr.allocatable))
12380 gfc_error ("Variable '%s' at %L with coarray component "
12381 "shall be a nonpointer, nonallocatable scalar",
12382 sym->name, &sym->declared_at);
12384 /* F2008, C526. The function-result case was handled above. */
12385 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12386 || sym->attr.codimension)
12387 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
12388 || sym->ns->save_all
12389 || sym->ns->proc_name->attr.flavor == FL_MODULE
12390 || sym->ns->proc_name->attr.is_main_program
12391 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
12392 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
12393 "component and is not ALLOCATABLE, SAVE nor a "
12394 "dummy argument", sym->name, &sym->declared_at);
12395 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
12396 else if (sym->attr.codimension && !sym->attr.allocatable
12397 && sym->as && sym->as->cotype == AS_DEFERRED)
12398 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
12399 "deferred shape", sym->name, &sym->declared_at);
12400 else if (sym->attr.codimension && sym->attr.allocatable
12401 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
12402 gfc_error ("Allocatable coarray variable '%s' at %L must have "
12403 "deferred shape", sym->name, &sym->declared_at);
12407 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12408 || (sym->attr.codimension && sym->attr.allocatable))
12409 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
12410 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
12411 "allocatable coarray or have coarray components",
12412 sym->name, &sym->declared_at);
12414 if (sym->attr.codimension && sym->attr.dummy
12415 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
12416 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
12417 "procedure '%s'", sym->name, &sym->declared_at,
12418 sym->ns->proc_name->name);
12420 switch (sym->attr.flavor)
12423 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
12428 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
12433 if (resolve_fl_namelist (sym) == FAILURE)
12438 if (resolve_fl_parameter (sym) == FAILURE)
12446 /* Resolve array specifier. Check as well some constraints
12447 on COMMON blocks. */
12449 check_constant = sym->attr.in_common && !sym->attr.pointer;
12451 /* Set the formal_arg_flag so that check_conflict will not throw
12452 an error for host associated variables in the specification
12453 expression for an array_valued function. */
12454 if (sym->attr.function && sym->as)
12455 formal_arg_flag = 1;
12457 gfc_resolve_array_spec (sym->as, check_constant);
12459 formal_arg_flag = 0;
12461 /* Resolve formal namespaces. */
12462 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
12463 && !sym->attr.contained && !sym->attr.intrinsic)
12464 gfc_resolve (sym->formal_ns);
12466 /* Make sure the formal namespace is present. */
12467 if (sym->formal && !sym->formal_ns)
12469 gfc_formal_arglist *formal = sym->formal;
12470 while (formal && !formal->sym)
12471 formal = formal->next;
12475 sym->formal_ns = formal->sym->ns;
12476 sym->formal_ns->refs++;
12480 /* Check threadprivate restrictions. */
12481 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
12482 && (!sym->attr.in_common
12483 && sym->module == NULL
12484 && (sym->ns->proc_name == NULL
12485 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
12486 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
12488 /* If we have come this far we can apply default-initializers, as
12489 described in 14.7.5, to those variables that have not already
12490 been assigned one. */
12491 if (sym->ts.type == BT_DERIVED
12492 && sym->ns == gfc_current_ns
12494 && !sym->attr.allocatable
12495 && !sym->attr.alloc_comp)
12497 symbol_attribute *a = &sym->attr;
12499 if ((!a->save && !a->dummy && !a->pointer
12500 && !a->in_common && !a->use_assoc
12501 && (a->referenced || a->result)
12502 && !(a->function && sym != sym->result))
12503 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
12504 apply_default_init (sym);
12507 if (sym->ts.type == BT_CLASS && sym->ns == gfc_current_ns
12508 && sym->attr.dummy && sym->attr.intent == INTENT_OUT
12509 && !CLASS_DATA (sym)->attr.class_pointer
12510 && !CLASS_DATA (sym)->attr.allocatable)
12511 apply_default_init (sym);
12513 /* If this symbol has a type-spec, check it. */
12514 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
12515 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
12516 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
12522 /************* Resolve DATA statements *************/
12526 gfc_data_value *vnode;
12532 /* Advance the values structure to point to the next value in the data list. */
12535 next_data_value (void)
12537 while (mpz_cmp_ui (values.left, 0) == 0)
12540 if (values.vnode->next == NULL)
12543 values.vnode = values.vnode->next;
12544 mpz_set (values.left, values.vnode->repeat);
12552 check_data_variable (gfc_data_variable *var, locus *where)
12558 ar_type mark = AR_UNKNOWN;
12560 mpz_t section_index[GFC_MAX_DIMENSIONS];
12566 if (gfc_resolve_expr (var->expr) == FAILURE)
12570 mpz_init_set_si (offset, 0);
12573 if (e->expr_type != EXPR_VARIABLE)
12574 gfc_internal_error ("check_data_variable(): Bad expression");
12576 sym = e->symtree->n.sym;
12578 if (sym->ns->is_block_data && !sym->attr.in_common)
12580 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
12581 sym->name, &sym->declared_at);
12584 if (e->ref == NULL && sym->as)
12586 gfc_error ("DATA array '%s' at %L must be specified in a previous"
12587 " declaration", sym->name, where);
12591 has_pointer = sym->attr.pointer;
12593 if (gfc_is_coindexed (e))
12595 gfc_error ("DATA element '%s' at %L cannot have a coindex", sym->name,
12600 for (ref = e->ref; ref; ref = ref->next)
12602 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
12606 && ref->type == REF_ARRAY
12607 && ref->u.ar.type != AR_FULL)
12609 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12610 "be a full array", sym->name, where);
12615 if (e->rank == 0 || has_pointer)
12617 mpz_init_set_ui (size, 1);
12624 /* Find the array section reference. */
12625 for (ref = e->ref; ref; ref = ref->next)
12627 if (ref->type != REF_ARRAY)
12629 if (ref->u.ar.type == AR_ELEMENT)
12635 /* Set marks according to the reference pattern. */
12636 switch (ref->u.ar.type)
12644 /* Get the start position of array section. */
12645 gfc_get_section_index (ar, section_index, &offset);
12650 gcc_unreachable ();
12653 if (gfc_array_size (e, &size) == FAILURE)
12655 gfc_error ("Nonconstant array section at %L in DATA statement",
12657 mpz_clear (offset);
12664 while (mpz_cmp_ui (size, 0) > 0)
12666 if (next_data_value () == FAILURE)
12668 gfc_error ("DATA statement at %L has more variables than values",
12674 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12678 /* If we have more than one element left in the repeat count,
12679 and we have more than one element left in the target variable,
12680 then create a range assignment. */
12681 /* FIXME: Only done for full arrays for now, since array sections
12683 if (mark == AR_FULL && ref && ref->next == NULL
12684 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12688 if (mpz_cmp (size, values.left) >= 0)
12690 mpz_init_set (range, values.left);
12691 mpz_sub (size, size, values.left);
12692 mpz_set_ui (values.left, 0);
12696 mpz_init_set (range, size);
12697 mpz_sub (values.left, values.left, size);
12698 mpz_set_ui (size, 0);
12701 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
12704 mpz_add (offset, offset, range);
12711 /* Assign initial value to symbol. */
12714 mpz_sub_ui (values.left, values.left, 1);
12715 mpz_sub_ui (size, size, 1);
12717 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
12721 if (mark == AR_FULL)
12722 mpz_add_ui (offset, offset, 1);
12724 /* Modify the array section indexes and recalculate the offset
12725 for next element. */
12726 else if (mark == AR_SECTION)
12727 gfc_advance_section (section_index, ar, &offset);
12731 if (mark == AR_SECTION)
12733 for (i = 0; i < ar->dimen; i++)
12734 mpz_clear (section_index[i]);
12738 mpz_clear (offset);
12744 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12746 /* Iterate over a list of elements in a DATA statement. */
12749 traverse_data_list (gfc_data_variable *var, locus *where)
12752 iterator_stack frame;
12753 gfc_expr *e, *start, *end, *step;
12754 gfc_try retval = SUCCESS;
12756 mpz_init (frame.value);
12759 start = gfc_copy_expr (var->iter.start);
12760 end = gfc_copy_expr (var->iter.end);
12761 step = gfc_copy_expr (var->iter.step);
12763 if (gfc_simplify_expr (start, 1) == FAILURE
12764 || start->expr_type != EXPR_CONSTANT)
12766 gfc_error ("start of implied-do loop at %L could not be "
12767 "simplified to a constant value", &start->where);
12771 if (gfc_simplify_expr (end, 1) == FAILURE
12772 || end->expr_type != EXPR_CONSTANT)
12774 gfc_error ("end of implied-do loop at %L could not be "
12775 "simplified to a constant value", &start->where);
12779 if (gfc_simplify_expr (step, 1) == FAILURE
12780 || step->expr_type != EXPR_CONSTANT)
12782 gfc_error ("step of implied-do loop at %L could not be "
12783 "simplified to a constant value", &start->where);
12788 mpz_set (trip, end->value.integer);
12789 mpz_sub (trip, trip, start->value.integer);
12790 mpz_add (trip, trip, step->value.integer);
12792 mpz_div (trip, trip, step->value.integer);
12794 mpz_set (frame.value, start->value.integer);
12796 frame.prev = iter_stack;
12797 frame.variable = var->iter.var->symtree;
12798 iter_stack = &frame;
12800 while (mpz_cmp_ui (trip, 0) > 0)
12802 if (traverse_data_var (var->list, where) == FAILURE)
12808 e = gfc_copy_expr (var->expr);
12809 if (gfc_simplify_expr (e, 1) == FAILURE)
12816 mpz_add (frame.value, frame.value, step->value.integer);
12818 mpz_sub_ui (trip, trip, 1);
12822 mpz_clear (frame.value);
12825 gfc_free_expr (start);
12826 gfc_free_expr (end);
12827 gfc_free_expr (step);
12829 iter_stack = frame.prev;
12834 /* Type resolve variables in the variable list of a DATA statement. */
12837 traverse_data_var (gfc_data_variable *var, locus *where)
12841 for (; var; var = var->next)
12843 if (var->expr == NULL)
12844 t = traverse_data_list (var, where);
12846 t = check_data_variable (var, where);
12856 /* Resolve the expressions and iterators associated with a data statement.
12857 This is separate from the assignment checking because data lists should
12858 only be resolved once. */
12861 resolve_data_variables (gfc_data_variable *d)
12863 for (; d; d = d->next)
12865 if (d->list == NULL)
12867 if (gfc_resolve_expr (d->expr) == FAILURE)
12872 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12875 if (resolve_data_variables (d->list) == FAILURE)
12884 /* Resolve a single DATA statement. We implement this by storing a pointer to
12885 the value list into static variables, and then recursively traversing the
12886 variables list, expanding iterators and such. */
12889 resolve_data (gfc_data *d)
12892 if (resolve_data_variables (d->var) == FAILURE)
12895 values.vnode = d->value;
12896 if (d->value == NULL)
12897 mpz_set_ui (values.left, 0);
12899 mpz_set (values.left, d->value->repeat);
12901 if (traverse_data_var (d->var, &d->where) == FAILURE)
12904 /* At this point, we better not have any values left. */
12906 if (next_data_value () == SUCCESS)
12907 gfc_error ("DATA statement at %L has more values than variables",
12912 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12913 accessed by host or use association, is a dummy argument to a pure function,
12914 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12915 is storage associated with any such variable, shall not be used in the
12916 following contexts: (clients of this function). */
12918 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12919 procedure. Returns zero if assignment is OK, nonzero if there is a
12922 gfc_impure_variable (gfc_symbol *sym)
12927 if (sym->attr.use_assoc || sym->attr.in_common)
12930 /* Check if the symbol's ns is inside the pure procedure. */
12931 for (ns = gfc_current_ns; ns; ns = ns->parent)
12935 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12939 proc = sym->ns->proc_name;
12940 if (sym->attr.dummy && gfc_pure (proc)
12941 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12943 proc->attr.function))
12946 /* TODO: Sort out what can be storage associated, if anything, and include
12947 it here. In principle equivalences should be scanned but it does not
12948 seem to be possible to storage associate an impure variable this way. */
12953 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12954 current namespace is inside a pure procedure. */
12957 gfc_pure (gfc_symbol *sym)
12959 symbol_attribute attr;
12964 /* Check if the current namespace or one of its parents
12965 belongs to a pure procedure. */
12966 for (ns = gfc_current_ns; ns; ns = ns->parent)
12968 sym = ns->proc_name;
12972 if (attr.flavor == FL_PROCEDURE && attr.pure)
12980 return attr.flavor == FL_PROCEDURE && attr.pure;
12984 /* Test whether a symbol is implicitly pure or not. For a NULL pointer,
12985 checks if the current namespace is implicitly pure. Note that this
12986 function returns false for a PURE procedure. */
12989 gfc_implicit_pure (gfc_symbol *sym)
12991 symbol_attribute attr;
12995 /* Check if the current namespace is implicit_pure. */
12996 sym = gfc_current_ns->proc_name;
13000 if (attr.flavor == FL_PROCEDURE
13001 && attr.implicit_pure && !attr.pure)
13008 return attr.flavor == FL_PROCEDURE && attr.implicit_pure && !attr.pure;
13012 /* Test whether the current procedure is elemental or not. */
13015 gfc_elemental (gfc_symbol *sym)
13017 symbol_attribute attr;
13020 sym = gfc_current_ns->proc_name;
13025 return attr.flavor == FL_PROCEDURE && attr.elemental;
13029 /* Warn about unused labels. */
13032 warn_unused_fortran_label (gfc_st_label *label)
13037 warn_unused_fortran_label (label->left);
13039 if (label->defined == ST_LABEL_UNKNOWN)
13042 switch (label->referenced)
13044 case ST_LABEL_UNKNOWN:
13045 gfc_warning ("Label %d at %L defined but not used", label->value,
13049 case ST_LABEL_BAD_TARGET:
13050 gfc_warning ("Label %d at %L defined but cannot be used",
13051 label->value, &label->where);
13058 warn_unused_fortran_label (label->right);
13062 /* Returns the sequence type of a symbol or sequence. */
13065 sequence_type (gfc_typespec ts)
13074 if (ts.u.derived->components == NULL)
13075 return SEQ_NONDEFAULT;
13077 result = sequence_type (ts.u.derived->components->ts);
13078 for (c = ts.u.derived->components->next; c; c = c->next)
13079 if (sequence_type (c->ts) != result)
13085 if (ts.kind != gfc_default_character_kind)
13086 return SEQ_NONDEFAULT;
13088 return SEQ_CHARACTER;
13091 if (ts.kind != gfc_default_integer_kind)
13092 return SEQ_NONDEFAULT;
13094 return SEQ_NUMERIC;
13097 if (!(ts.kind == gfc_default_real_kind
13098 || ts.kind == gfc_default_double_kind))
13099 return SEQ_NONDEFAULT;
13101 return SEQ_NUMERIC;
13104 if (ts.kind != gfc_default_complex_kind)
13105 return SEQ_NONDEFAULT;
13107 return SEQ_NUMERIC;
13110 if (ts.kind != gfc_default_logical_kind)
13111 return SEQ_NONDEFAULT;
13113 return SEQ_NUMERIC;
13116 return SEQ_NONDEFAULT;
13121 /* Resolve derived type EQUIVALENCE object. */
13124 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
13126 gfc_component *c = derived->components;
13131 /* Shall not be an object of nonsequence derived type. */
13132 if (!derived->attr.sequence)
13134 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
13135 "attribute to be an EQUIVALENCE object", sym->name,
13140 /* Shall not have allocatable components. */
13141 if (derived->attr.alloc_comp)
13143 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
13144 "components to be an EQUIVALENCE object",sym->name,
13149 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
13151 gfc_error ("Derived type variable '%s' at %L with default "
13152 "initialization cannot be in EQUIVALENCE with a variable "
13153 "in COMMON", sym->name, &e->where);
13157 for (; c ; c = c->next)
13159 if (c->ts.type == BT_DERIVED
13160 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
13163 /* Shall not be an object of sequence derived type containing a pointer
13164 in the structure. */
13165 if (c->attr.pointer)
13167 gfc_error ("Derived type variable '%s' at %L with pointer "
13168 "component(s) cannot be an EQUIVALENCE object",
13169 sym->name, &e->where);
13177 /* Resolve equivalence object.
13178 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
13179 an allocatable array, an object of nonsequence derived type, an object of
13180 sequence derived type containing a pointer at any level of component
13181 selection, an automatic object, a function name, an entry name, a result
13182 name, a named constant, a structure component, or a subobject of any of
13183 the preceding objects. A substring shall not have length zero. A
13184 derived type shall not have components with default initialization nor
13185 shall two objects of an equivalence group be initialized.
13186 Either all or none of the objects shall have an protected attribute.
13187 The simple constraints are done in symbol.c(check_conflict) and the rest
13188 are implemented here. */
13191 resolve_equivalence (gfc_equiv *eq)
13194 gfc_symbol *first_sym;
13197 locus *last_where = NULL;
13198 seq_type eq_type, last_eq_type;
13199 gfc_typespec *last_ts;
13200 int object, cnt_protected;
13203 last_ts = &eq->expr->symtree->n.sym->ts;
13205 first_sym = eq->expr->symtree->n.sym;
13209 for (object = 1; eq; eq = eq->eq, object++)
13213 e->ts = e->symtree->n.sym->ts;
13214 /* match_varspec might not know yet if it is seeing
13215 array reference or substring reference, as it doesn't
13217 if (e->ref && e->ref->type == REF_ARRAY)
13219 gfc_ref *ref = e->ref;
13220 sym = e->symtree->n.sym;
13222 if (sym->attr.dimension)
13224 ref->u.ar.as = sym->as;
13228 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
13229 if (e->ts.type == BT_CHARACTER
13231 && ref->type == REF_ARRAY
13232 && ref->u.ar.dimen == 1
13233 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
13234 && ref->u.ar.stride[0] == NULL)
13236 gfc_expr *start = ref->u.ar.start[0];
13237 gfc_expr *end = ref->u.ar.end[0];
13240 /* Optimize away the (:) reference. */
13241 if (start == NULL && end == NULL)
13244 e->ref = ref->next;
13246 e->ref->next = ref->next;
13251 ref->type = REF_SUBSTRING;
13253 start = gfc_get_int_expr (gfc_default_integer_kind,
13255 ref->u.ss.start = start;
13256 if (end == NULL && e->ts.u.cl)
13257 end = gfc_copy_expr (e->ts.u.cl->length);
13258 ref->u.ss.end = end;
13259 ref->u.ss.length = e->ts.u.cl;
13266 /* Any further ref is an error. */
13269 gcc_assert (ref->type == REF_ARRAY);
13270 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
13276 if (gfc_resolve_expr (e) == FAILURE)
13279 sym = e->symtree->n.sym;
13281 if (sym->attr.is_protected)
13283 if (cnt_protected > 0 && cnt_protected != object)
13285 gfc_error ("Either all or none of the objects in the "
13286 "EQUIVALENCE set at %L shall have the "
13287 "PROTECTED attribute",
13292 /* Shall not equivalence common block variables in a PURE procedure. */
13293 if (sym->ns->proc_name
13294 && sym->ns->proc_name->attr.pure
13295 && sym->attr.in_common)
13297 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
13298 "object in the pure procedure '%s'",
13299 sym->name, &e->where, sym->ns->proc_name->name);
13303 /* Shall not be a named constant. */
13304 if (e->expr_type == EXPR_CONSTANT)
13306 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
13307 "object", sym->name, &e->where);
13311 if (e->ts.type == BT_DERIVED
13312 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
13315 /* Check that the types correspond correctly:
13317 A numeric sequence structure may be equivalenced to another sequence
13318 structure, an object of default integer type, default real type, double
13319 precision real type, default logical type such that components of the
13320 structure ultimately only become associated to objects of the same
13321 kind. A character sequence structure may be equivalenced to an object
13322 of default character kind or another character sequence structure.
13323 Other objects may be equivalenced only to objects of the same type and
13324 kind parameters. */
13326 /* Identical types are unconditionally OK. */
13327 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
13328 goto identical_types;
13330 last_eq_type = sequence_type (*last_ts);
13331 eq_type = sequence_type (sym->ts);
13333 /* Since the pair of objects is not of the same type, mixed or
13334 non-default sequences can be rejected. */
13336 msg = "Sequence %s with mixed components in EQUIVALENCE "
13337 "statement at %L with different type objects";
13339 && last_eq_type == SEQ_MIXED
13340 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
13342 || (eq_type == SEQ_MIXED
13343 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13344 &e->where) == FAILURE))
13347 msg = "Non-default type object or sequence %s in EQUIVALENCE "
13348 "statement at %L with objects of different type";
13350 && last_eq_type == SEQ_NONDEFAULT
13351 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
13352 last_where) == FAILURE)
13353 || (eq_type == SEQ_NONDEFAULT
13354 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13355 &e->where) == FAILURE))
13358 msg ="Non-CHARACTER object '%s' in default CHARACTER "
13359 "EQUIVALENCE statement at %L";
13360 if (last_eq_type == SEQ_CHARACTER
13361 && eq_type != SEQ_CHARACTER
13362 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13363 &e->where) == FAILURE)
13366 msg ="Non-NUMERIC object '%s' in default NUMERIC "
13367 "EQUIVALENCE statement at %L";
13368 if (last_eq_type == SEQ_NUMERIC
13369 && eq_type != SEQ_NUMERIC
13370 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13371 &e->where) == FAILURE)
13376 last_where = &e->where;
13381 /* Shall not be an automatic array. */
13382 if (e->ref->type == REF_ARRAY
13383 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
13385 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
13386 "an EQUIVALENCE object", sym->name, &e->where);
13393 /* Shall not be a structure component. */
13394 if (r->type == REF_COMPONENT)
13396 gfc_error ("Structure component '%s' at %L cannot be an "
13397 "EQUIVALENCE object",
13398 r->u.c.component->name, &e->where);
13402 /* A substring shall not have length zero. */
13403 if (r->type == REF_SUBSTRING)
13405 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
13407 gfc_error ("Substring at %L has length zero",
13408 &r->u.ss.start->where);
13418 /* Resolve function and ENTRY types, issue diagnostics if needed. */
13421 resolve_fntype (gfc_namespace *ns)
13423 gfc_entry_list *el;
13426 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
13429 /* If there are any entries, ns->proc_name is the entry master
13430 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
13432 sym = ns->entries->sym;
13434 sym = ns->proc_name;
13435 if (sym->result == sym
13436 && sym->ts.type == BT_UNKNOWN
13437 && gfc_set_default_type (sym, 0, NULL) == FAILURE
13438 && !sym->attr.untyped)
13440 gfc_error ("Function '%s' at %L has no IMPLICIT type",
13441 sym->name, &sym->declared_at);
13442 sym->attr.untyped = 1;
13445 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
13446 && !sym->attr.contained
13447 && !gfc_check_symbol_access (sym->ts.u.derived)
13448 && gfc_check_symbol_access (sym))
13450 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
13451 "%L of PRIVATE type '%s'", sym->name,
13452 &sym->declared_at, sym->ts.u.derived->name);
13456 for (el = ns->entries->next; el; el = el->next)
13458 if (el->sym->result == el->sym
13459 && el->sym->ts.type == BT_UNKNOWN
13460 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
13461 && !el->sym->attr.untyped)
13463 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
13464 el->sym->name, &el->sym->declared_at);
13465 el->sym->attr.untyped = 1;
13471 /* 12.3.2.1.1 Defined operators. */
13474 check_uop_procedure (gfc_symbol *sym, locus where)
13476 gfc_formal_arglist *formal;
13478 if (!sym->attr.function)
13480 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
13481 sym->name, &where);
13485 if (sym->ts.type == BT_CHARACTER
13486 && !(sym->ts.u.cl && sym->ts.u.cl->length)
13487 && !(sym->result && sym->result->ts.u.cl
13488 && sym->result->ts.u.cl->length))
13490 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
13491 "character length", sym->name, &where);
13495 formal = sym->formal;
13496 if (!formal || !formal->sym)
13498 gfc_error ("User operator procedure '%s' at %L must have at least "
13499 "one argument", sym->name, &where);
13503 if (formal->sym->attr.intent != INTENT_IN)
13505 gfc_error ("First argument of operator interface at %L must be "
13506 "INTENT(IN)", &where);
13510 if (formal->sym->attr.optional)
13512 gfc_error ("First argument of operator interface at %L cannot be "
13513 "optional", &where);
13517 formal = formal->next;
13518 if (!formal || !formal->sym)
13521 if (formal->sym->attr.intent != INTENT_IN)
13523 gfc_error ("Second argument of operator interface at %L must be "
13524 "INTENT(IN)", &where);
13528 if (formal->sym->attr.optional)
13530 gfc_error ("Second argument of operator interface at %L cannot be "
13531 "optional", &where);
13537 gfc_error ("Operator interface at %L must have, at most, two "
13538 "arguments", &where);
13546 gfc_resolve_uops (gfc_symtree *symtree)
13548 gfc_interface *itr;
13550 if (symtree == NULL)
13553 gfc_resolve_uops (symtree->left);
13554 gfc_resolve_uops (symtree->right);
13556 for (itr = symtree->n.uop->op; itr; itr = itr->next)
13557 check_uop_procedure (itr->sym, itr->sym->declared_at);
13561 /* Examine all of the expressions associated with a program unit,
13562 assign types to all intermediate expressions, make sure that all
13563 assignments are to compatible types and figure out which names
13564 refer to which functions or subroutines. It doesn't check code
13565 block, which is handled by resolve_code. */
13568 resolve_types (gfc_namespace *ns)
13574 gfc_namespace* old_ns = gfc_current_ns;
13576 /* Check that all IMPLICIT types are ok. */
13577 if (!ns->seen_implicit_none)
13580 for (letter = 0; letter != GFC_LETTERS; ++letter)
13581 if (ns->set_flag[letter]
13582 && resolve_typespec_used (&ns->default_type[letter],
13583 &ns->implicit_loc[letter],
13588 gfc_current_ns = ns;
13590 resolve_entries (ns);
13592 resolve_common_vars (ns->blank_common.head, false);
13593 resolve_common_blocks (ns->common_root);
13595 resolve_contained_functions (ns);
13597 if (ns->proc_name && ns->proc_name->attr.flavor == FL_PROCEDURE
13598 && ns->proc_name->attr.if_source == IFSRC_IFBODY)
13599 resolve_formal_arglist (ns->proc_name);
13601 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
13603 for (cl = ns->cl_list; cl; cl = cl->next)
13604 resolve_charlen (cl);
13606 gfc_traverse_ns (ns, resolve_symbol);
13608 resolve_fntype (ns);
13610 for (n = ns->contained; n; n = n->sibling)
13612 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
13613 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
13614 "also be PURE", n->proc_name->name,
13615 &n->proc_name->declared_at);
13621 gfc_check_interfaces (ns);
13623 gfc_traverse_ns (ns, resolve_values);
13629 for (d = ns->data; d; d = d->next)
13633 gfc_traverse_ns (ns, gfc_formalize_init_value);
13635 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13637 if (ns->common_root != NULL)
13638 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13640 for (eq = ns->equiv; eq; eq = eq->next)
13641 resolve_equivalence (eq);
13643 /* Warn about unused labels. */
13644 if (warn_unused_label)
13645 warn_unused_fortran_label (ns->st_labels);
13647 gfc_resolve_uops (ns->uop_root);
13649 gfc_current_ns = old_ns;
13653 /* Call resolve_code recursively. */
13656 resolve_codes (gfc_namespace *ns)
13659 bitmap_obstack old_obstack;
13661 if (ns->resolved == 1)
13664 for (n = ns->contained; n; n = n->sibling)
13667 gfc_current_ns = ns;
13669 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13670 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13673 /* Set to an out of range value. */
13674 current_entry_id = -1;
13676 old_obstack = labels_obstack;
13677 bitmap_obstack_initialize (&labels_obstack);
13679 resolve_code (ns->code, ns);
13681 bitmap_obstack_release (&labels_obstack);
13682 labels_obstack = old_obstack;
13686 /* This function is called after a complete program unit has been compiled.
13687 Its purpose is to examine all of the expressions associated with a program
13688 unit, assign types to all intermediate expressions, make sure that all
13689 assignments are to compatible types and figure out which names refer to
13690 which functions or subroutines. */
13693 gfc_resolve (gfc_namespace *ns)
13695 gfc_namespace *old_ns;
13696 code_stack *old_cs_base;
13702 old_ns = gfc_current_ns;
13703 old_cs_base = cs_base;
13705 resolve_types (ns);
13706 resolve_codes (ns);
13708 gfc_current_ns = old_ns;
13709 cs_base = old_cs_base;
13712 gfc_run_passes (ns);