1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
29 #include "arith.h" /* For gfc_compare_expr(). */
30 #include "dependency.h"
32 #include "target-memory.h" /* for gfc_simplify_transfer */
33 #include "constructor.h"
35 /* Types used in equivalence statements. */
39 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
43 /* Stack to keep track of the nesting of blocks as we move through the
44 code. See resolve_branch() and resolve_code(). */
46 typedef struct code_stack
48 struct gfc_code *head, *current;
49 struct code_stack *prev;
51 /* This bitmap keeps track of the targets valid for a branch from
52 inside this block except for END {IF|SELECT}s of enclosing
54 bitmap reachable_labels;
58 static code_stack *cs_base = NULL;
61 /* Nonzero if we're inside a FORALL block. */
63 static int forall_flag;
65 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
67 static int omp_workshare_flag;
69 /* Nonzero if we are processing a formal arglist. The corresponding function
70 resets the flag each time that it is read. */
71 static int formal_arg_flag = 0;
73 /* True if we are resolving a specification expression. */
74 static int specification_expr = 0;
76 /* The id of the last entry seen. */
77 static int current_entry_id;
79 /* We use bitmaps to determine if a branch target is valid. */
80 static bitmap_obstack labels_obstack;
82 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
83 static bool inquiry_argument = false;
86 gfc_is_formal_arg (void)
88 return formal_arg_flag;
91 /* Is the symbol host associated? */
93 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
95 for (ns = ns->parent; ns; ns = ns->parent)
104 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
105 an ABSTRACT derived-type. If where is not NULL, an error message with that
106 locus is printed, optionally using name. */
109 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
111 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
116 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
117 name, where, ts->u.derived->name);
119 gfc_error ("ABSTRACT type '%s' used at %L",
120 ts->u.derived->name, where);
130 static void resolve_symbol (gfc_symbol *sym);
131 static gfc_try resolve_intrinsic (gfc_symbol *sym, locus *loc);
134 /* Resolve the interface for a PROCEDURE declaration or procedure pointer. */
137 resolve_procedure_interface (gfc_symbol *sym)
139 if (sym->ts.interface == sym)
141 gfc_error ("PROCEDURE '%s' at %L may not be used as its own interface",
142 sym->name, &sym->declared_at);
145 if (sym->ts.interface->attr.procedure)
147 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared "
148 "in a later PROCEDURE statement", sym->ts.interface->name,
149 sym->name, &sym->declared_at);
153 /* Get the attributes from the interface (now resolved). */
154 if (sym->ts.interface->attr.if_source || sym->ts.interface->attr.intrinsic)
156 gfc_symbol *ifc = sym->ts.interface;
157 resolve_symbol (ifc);
159 if (ifc->attr.intrinsic)
160 resolve_intrinsic (ifc, &ifc->declared_at);
164 sym->ts = ifc->result->ts;
169 sym->ts.interface = ifc;
170 sym->attr.function = ifc->attr.function;
171 sym->attr.subroutine = ifc->attr.subroutine;
172 gfc_copy_formal_args (sym, ifc);
174 sym->attr.allocatable = ifc->attr.allocatable;
175 sym->attr.pointer = ifc->attr.pointer;
176 sym->attr.pure = ifc->attr.pure;
177 sym->attr.elemental = ifc->attr.elemental;
178 sym->attr.dimension = ifc->attr.dimension;
179 sym->attr.contiguous = ifc->attr.contiguous;
180 sym->attr.recursive = ifc->attr.recursive;
181 sym->attr.always_explicit = ifc->attr.always_explicit;
182 sym->attr.ext_attr |= ifc->attr.ext_attr;
183 sym->attr.is_bind_c = ifc->attr.is_bind_c;
184 /* Copy array spec. */
185 sym->as = gfc_copy_array_spec (ifc->as);
189 for (i = 0; i < sym->as->rank; i++)
191 gfc_expr_replace_symbols (sym->as->lower[i], sym);
192 gfc_expr_replace_symbols (sym->as->upper[i], sym);
195 /* Copy char length. */
196 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
198 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
199 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
200 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
201 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
205 else if (sym->ts.interface->name[0] != '\0')
207 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
208 sym->ts.interface->name, sym->name, &sym->declared_at);
216 /* Resolve types of formal argument lists. These have to be done early so that
217 the formal argument lists of module procedures can be copied to the
218 containing module before the individual procedures are resolved
219 individually. We also resolve argument lists of procedures in interface
220 blocks because they are self-contained scoping units.
222 Since a dummy argument cannot be a non-dummy procedure, the only
223 resort left for untyped names are the IMPLICIT types. */
226 resolve_formal_arglist (gfc_symbol *proc)
228 gfc_formal_arglist *f;
232 if (proc->result != NULL)
237 if (gfc_elemental (proc)
238 || sym->attr.pointer || sym->attr.allocatable
239 || (sym->as && sym->as->rank > 0))
241 proc->attr.always_explicit = 1;
242 sym->attr.always_explicit = 1;
247 for (f = proc->formal; f; f = f->next)
253 /* Alternate return placeholder. */
254 if (gfc_elemental (proc))
255 gfc_error ("Alternate return specifier in elemental subroutine "
256 "'%s' at %L is not allowed", proc->name,
258 if (proc->attr.function)
259 gfc_error ("Alternate return specifier in function "
260 "'%s' at %L is not allowed", proc->name,
264 else if (sym->attr.procedure && sym->ts.interface
265 && sym->attr.if_source != IFSRC_DECL)
266 resolve_procedure_interface (sym);
268 if (sym->attr.if_source != IFSRC_UNKNOWN)
269 resolve_formal_arglist (sym);
271 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
273 if (gfc_pure (proc) && !gfc_pure (sym))
275 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
276 "also be PURE", sym->name, &sym->declared_at);
280 if (proc->attr.implicit_pure && !gfc_pure(sym))
281 proc->attr.implicit_pure = 0;
283 if (gfc_elemental (proc))
285 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
286 "procedure", &sym->declared_at);
290 if (sym->attr.function
291 && sym->ts.type == BT_UNKNOWN
292 && sym->attr.intrinsic)
294 gfc_intrinsic_sym *isym;
295 isym = gfc_find_function (sym->name);
296 if (isym == NULL || !isym->specific)
298 gfc_error ("Unable to find a specific INTRINSIC procedure "
299 "for the reference '%s' at %L", sym->name,
308 if (sym->ts.type == BT_UNKNOWN && !proc->attr.intrinsic
309 && (!sym->attr.function || sym->result == sym))
310 gfc_set_default_type (sym, 1, sym->ns);
312 gfc_resolve_array_spec (sym->as, 0);
314 /* We can't tell if an array with dimension (:) is assumed or deferred
315 shape until we know if it has the pointer or allocatable attributes.
317 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
318 && !(sym->attr.pointer || sym->attr.allocatable)
319 && sym->attr.flavor != FL_PROCEDURE)
321 sym->as->type = AS_ASSUMED_SHAPE;
322 for (i = 0; i < sym->as->rank; i++)
323 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
327 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
328 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
329 || sym->attr.optional)
331 proc->attr.always_explicit = 1;
333 proc->result->attr.always_explicit = 1;
336 /* If the flavor is unknown at this point, it has to be a variable.
337 A procedure specification would have already set the type. */
339 if (sym->attr.flavor == FL_UNKNOWN)
340 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
342 if (gfc_pure (proc) && !sym->attr.pointer
343 && sym->attr.flavor != FL_PROCEDURE)
345 if (proc->attr.function && sym->attr.intent != INTENT_IN)
348 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
349 "of pure function '%s' at %L with VALUE "
350 "attribute but without INTENT(IN)", sym->name,
351 proc->name, &sym->declared_at);
353 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
354 "INTENT(IN) or VALUE", sym->name, proc->name,
358 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
361 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
362 "of pure subroutine '%s' at %L with VALUE "
363 "attribute but without INTENT", sym->name,
364 proc->name, &sym->declared_at);
366 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
367 "have its INTENT specified or have the VALUE "
368 "attribute", sym->name, proc->name, &sym->declared_at);
372 if (proc->attr.implicit_pure && !sym->attr.pointer
373 && sym->attr.flavor != FL_PROCEDURE)
375 if (proc->attr.function && sym->attr.intent != INTENT_IN)
376 proc->attr.implicit_pure = 0;
378 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
379 proc->attr.implicit_pure = 0;
382 if (gfc_elemental (proc))
385 if (sym->attr.codimension)
387 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
388 "procedure", sym->name, &sym->declared_at);
394 gfc_error ("Argument '%s' of elemental procedure at %L must "
395 "be scalar", sym->name, &sym->declared_at);
399 if (sym->attr.allocatable)
401 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
402 "have the ALLOCATABLE attribute", sym->name,
407 if (sym->attr.pointer)
409 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
410 "have the POINTER attribute", sym->name,
415 if (sym->attr.flavor == FL_PROCEDURE)
417 gfc_error ("Dummy procedure '%s' not allowed in elemental "
418 "procedure '%s' at %L", sym->name, proc->name,
423 if (sym->attr.intent == INTENT_UNKNOWN)
425 gfc_error ("Argument '%s' of elemental procedure '%s' at %L must "
426 "have its INTENT specified", sym->name, proc->name,
432 /* Each dummy shall be specified to be scalar. */
433 if (proc->attr.proc == PROC_ST_FUNCTION)
437 gfc_error ("Argument '%s' of statement function at %L must "
438 "be scalar", sym->name, &sym->declared_at);
442 if (sym->ts.type == BT_CHARACTER)
444 gfc_charlen *cl = sym->ts.u.cl;
445 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
447 gfc_error ("Character-valued argument '%s' of statement "
448 "function at %L must have constant length",
449 sym->name, &sym->declared_at);
459 /* Work function called when searching for symbols that have argument lists
460 associated with them. */
463 find_arglists (gfc_symbol *sym)
465 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
468 resolve_formal_arglist (sym);
472 /* Given a namespace, resolve all formal argument lists within the namespace.
476 resolve_formal_arglists (gfc_namespace *ns)
481 gfc_traverse_ns (ns, find_arglists);
486 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
490 /* If this namespace is not a function or an entry master function,
492 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
493 || sym->attr.entry_master)
496 /* Try to find out of what the return type is. */
497 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
499 t = gfc_set_default_type (sym->result, 0, ns);
501 if (t == FAILURE && !sym->result->attr.untyped)
503 if (sym->result == sym)
504 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
505 sym->name, &sym->declared_at);
506 else if (!sym->result->attr.proc_pointer)
507 gfc_error ("Result '%s' of contained function '%s' at %L has "
508 "no IMPLICIT type", sym->result->name, sym->name,
509 &sym->result->declared_at);
510 sym->result->attr.untyped = 1;
514 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
515 type, lists the only ways a character length value of * can be used:
516 dummy arguments of procedures, named constants, and function results
517 in external functions. Internal function results and results of module
518 procedures are not on this list, ergo, not permitted. */
520 if (sym->result->ts.type == BT_CHARACTER)
522 gfc_charlen *cl = sym->result->ts.u.cl;
523 if ((!cl || !cl->length) && !sym->result->ts.deferred)
525 /* See if this is a module-procedure and adapt error message
528 gcc_assert (ns->parent && ns->parent->proc_name);
529 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
531 gfc_error ("Character-valued %s '%s' at %L must not be"
533 module_proc ? _("module procedure")
534 : _("internal function"),
535 sym->name, &sym->declared_at);
541 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
542 introduce duplicates. */
545 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
547 gfc_formal_arglist *f, *new_arglist;
550 for (; new_args != NULL; new_args = new_args->next)
552 new_sym = new_args->sym;
553 /* See if this arg is already in the formal argument list. */
554 for (f = proc->formal; f; f = f->next)
556 if (new_sym == f->sym)
563 /* Add a new argument. Argument order is not important. */
564 new_arglist = gfc_get_formal_arglist ();
565 new_arglist->sym = new_sym;
566 new_arglist->next = proc->formal;
567 proc->formal = new_arglist;
572 /* Flag the arguments that are not present in all entries. */
575 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
577 gfc_formal_arglist *f, *head;
580 for (f = proc->formal; f; f = f->next)
585 for (new_args = head; new_args; new_args = new_args->next)
587 if (new_args->sym == f->sym)
594 f->sym->attr.not_always_present = 1;
599 /* Resolve alternate entry points. If a symbol has multiple entry points we
600 create a new master symbol for the main routine, and turn the existing
601 symbol into an entry point. */
604 resolve_entries (gfc_namespace *ns)
606 gfc_namespace *old_ns;
610 char name[GFC_MAX_SYMBOL_LEN + 1];
611 static int master_count = 0;
613 if (ns->proc_name == NULL)
616 /* No need to do anything if this procedure doesn't have alternate entry
621 /* We may already have resolved alternate entry points. */
622 if (ns->proc_name->attr.entry_master)
625 /* If this isn't a procedure something has gone horribly wrong. */
626 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
628 /* Remember the current namespace. */
629 old_ns = gfc_current_ns;
633 /* Add the main entry point to the list of entry points. */
634 el = gfc_get_entry_list ();
635 el->sym = ns->proc_name;
637 el->next = ns->entries;
639 ns->proc_name->attr.entry = 1;
641 /* If it is a module function, it needs to be in the right namespace
642 so that gfc_get_fake_result_decl can gather up the results. The
643 need for this arose in get_proc_name, where these beasts were
644 left in their own namespace, to keep prior references linked to
645 the entry declaration.*/
646 if (ns->proc_name->attr.function
647 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
650 /* Do the same for entries where the master is not a module
651 procedure. These are retained in the module namespace because
652 of the module procedure declaration. */
653 for (el = el->next; el; el = el->next)
654 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
655 && el->sym->attr.mod_proc)
659 /* Add an entry statement for it. */
666 /* Create a new symbol for the master function. */
667 /* Give the internal function a unique name (within this file).
668 Also include the function name so the user has some hope of figuring
669 out what is going on. */
670 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
671 master_count++, ns->proc_name->name);
672 gfc_get_ha_symbol (name, &proc);
673 gcc_assert (proc != NULL);
675 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
676 if (ns->proc_name->attr.subroutine)
677 gfc_add_subroutine (&proc->attr, proc->name, NULL);
681 gfc_typespec *ts, *fts;
682 gfc_array_spec *as, *fas;
683 gfc_add_function (&proc->attr, proc->name, NULL);
685 fas = ns->entries->sym->as;
686 fas = fas ? fas : ns->entries->sym->result->as;
687 fts = &ns->entries->sym->result->ts;
688 if (fts->type == BT_UNKNOWN)
689 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
690 for (el = ns->entries->next; el; el = el->next)
692 ts = &el->sym->result->ts;
694 as = as ? as : el->sym->result->as;
695 if (ts->type == BT_UNKNOWN)
696 ts = gfc_get_default_type (el->sym->result->name, NULL);
698 if (! gfc_compare_types (ts, fts)
699 || (el->sym->result->attr.dimension
700 != ns->entries->sym->result->attr.dimension)
701 || (el->sym->result->attr.pointer
702 != ns->entries->sym->result->attr.pointer))
704 else if (as && fas && ns->entries->sym->result != el->sym->result
705 && gfc_compare_array_spec (as, fas) == 0)
706 gfc_error ("Function %s at %L has entries with mismatched "
707 "array specifications", ns->entries->sym->name,
708 &ns->entries->sym->declared_at);
709 /* The characteristics need to match and thus both need to have
710 the same string length, i.e. both len=*, or both len=4.
711 Having both len=<variable> is also possible, but difficult to
712 check at compile time. */
713 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
714 && (((ts->u.cl->length && !fts->u.cl->length)
715 ||(!ts->u.cl->length && fts->u.cl->length))
717 && ts->u.cl->length->expr_type
718 != fts->u.cl->length->expr_type)
720 && ts->u.cl->length->expr_type == EXPR_CONSTANT
721 && mpz_cmp (ts->u.cl->length->value.integer,
722 fts->u.cl->length->value.integer) != 0)))
723 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
724 "entries returning variables of different "
725 "string lengths", ns->entries->sym->name,
726 &ns->entries->sym->declared_at);
731 sym = ns->entries->sym->result;
732 /* All result types the same. */
734 if (sym->attr.dimension)
735 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
736 if (sym->attr.pointer)
737 gfc_add_pointer (&proc->attr, NULL);
741 /* Otherwise the result will be passed through a union by
743 proc->attr.mixed_entry_master = 1;
744 for (el = ns->entries; el; el = el->next)
746 sym = el->sym->result;
747 if (sym->attr.dimension)
749 if (el == ns->entries)
750 gfc_error ("FUNCTION result %s can't be an array in "
751 "FUNCTION %s at %L", sym->name,
752 ns->entries->sym->name, &sym->declared_at);
754 gfc_error ("ENTRY result %s can't be an array in "
755 "FUNCTION %s at %L", sym->name,
756 ns->entries->sym->name, &sym->declared_at);
758 else if (sym->attr.pointer)
760 if (el == ns->entries)
761 gfc_error ("FUNCTION result %s can't be a POINTER in "
762 "FUNCTION %s at %L", sym->name,
763 ns->entries->sym->name, &sym->declared_at);
765 gfc_error ("ENTRY result %s can't be a POINTER in "
766 "FUNCTION %s at %L", sym->name,
767 ns->entries->sym->name, &sym->declared_at);
772 if (ts->type == BT_UNKNOWN)
773 ts = gfc_get_default_type (sym->name, NULL);
777 if (ts->kind == gfc_default_integer_kind)
781 if (ts->kind == gfc_default_real_kind
782 || ts->kind == gfc_default_double_kind)
786 if (ts->kind == gfc_default_complex_kind)
790 if (ts->kind == gfc_default_logical_kind)
794 /* We will issue error elsewhere. */
802 if (el == ns->entries)
803 gfc_error ("FUNCTION result %s can't be of type %s "
804 "in FUNCTION %s at %L", sym->name,
805 gfc_typename (ts), ns->entries->sym->name,
808 gfc_error ("ENTRY result %s can't be of type %s "
809 "in FUNCTION %s at %L", sym->name,
810 gfc_typename (ts), ns->entries->sym->name,
817 proc->attr.access = ACCESS_PRIVATE;
818 proc->attr.entry_master = 1;
820 /* Merge all the entry point arguments. */
821 for (el = ns->entries; el; el = el->next)
822 merge_argument_lists (proc, el->sym->formal);
824 /* Check the master formal arguments for any that are not
825 present in all entry points. */
826 for (el = ns->entries; el; el = el->next)
827 check_argument_lists (proc, el->sym->formal);
829 /* Use the master function for the function body. */
830 ns->proc_name = proc;
832 /* Finalize the new symbols. */
833 gfc_commit_symbols ();
835 /* Restore the original namespace. */
836 gfc_current_ns = old_ns;
840 /* Resolve common variables. */
842 resolve_common_vars (gfc_symbol *sym, bool named_common)
844 gfc_symbol *csym = sym;
846 for (; csym; csym = csym->common_next)
848 if (csym->value || csym->attr.data)
850 if (!csym->ns->is_block_data)
851 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
852 "but only in BLOCK DATA initialization is "
853 "allowed", csym->name, &csym->declared_at);
854 else if (!named_common)
855 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
856 "in a blank COMMON but initialization is only "
857 "allowed in named common blocks", csym->name,
861 if (csym->ts.type != BT_DERIVED)
864 if (!(csym->ts.u.derived->attr.sequence
865 || csym->ts.u.derived->attr.is_bind_c))
866 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
867 "has neither the SEQUENCE nor the BIND(C) "
868 "attribute", csym->name, &csym->declared_at);
869 if (csym->ts.u.derived->attr.alloc_comp)
870 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
871 "has an ultimate component that is "
872 "allocatable", csym->name, &csym->declared_at);
873 if (gfc_has_default_initializer (csym->ts.u.derived))
874 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
875 "may not have default initializer", csym->name,
878 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
879 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
883 /* Resolve common blocks. */
885 resolve_common_blocks (gfc_symtree *common_root)
889 if (common_root == NULL)
892 if (common_root->left)
893 resolve_common_blocks (common_root->left);
894 if (common_root->right)
895 resolve_common_blocks (common_root->right);
897 resolve_common_vars (common_root->n.common->head, true);
899 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
903 if (sym->attr.flavor == FL_PARAMETER)
904 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
905 sym->name, &common_root->n.common->where, &sym->declared_at);
907 if (sym->attr.intrinsic)
908 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
909 sym->name, &common_root->n.common->where);
910 else if (sym->attr.result
911 || gfc_is_function_return_value (sym, gfc_current_ns))
912 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
913 "that is also a function result", sym->name,
914 &common_root->n.common->where);
915 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
916 && sym->attr.proc != PROC_ST_FUNCTION)
917 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
918 "that is also a global procedure", sym->name,
919 &common_root->n.common->where);
923 /* Resolve contained function types. Because contained functions can call one
924 another, they have to be worked out before any of the contained procedures
927 The good news is that if a function doesn't already have a type, the only
928 way it can get one is through an IMPLICIT type or a RESULT variable, because
929 by definition contained functions are contained namespace they're contained
930 in, not in a sibling or parent namespace. */
933 resolve_contained_functions (gfc_namespace *ns)
935 gfc_namespace *child;
938 resolve_formal_arglists (ns);
940 for (child = ns->contained; child; child = child->sibling)
942 /* Resolve alternate entry points first. */
943 resolve_entries (child);
945 /* Then check function return types. */
946 resolve_contained_fntype (child->proc_name, child);
947 for (el = child->entries; el; el = el->next)
948 resolve_contained_fntype (el->sym, child);
953 static gfc_try resolve_fl_derived0 (gfc_symbol *sym);
956 /* Resolve all of the elements of a structure constructor and make sure that
957 the types are correct. The 'init' flag indicates that the given
958 constructor is an initializer. */
961 resolve_structure_cons (gfc_expr *expr, int init)
963 gfc_constructor *cons;
970 if (expr->ts.type == BT_DERIVED)
971 resolve_fl_derived0 (expr->ts.u.derived);
973 cons = gfc_constructor_first (expr->value.constructor);
974 /* A constructor may have references if it is the result of substituting a
975 parameter variable. In this case we just pull out the component we
978 comp = expr->ref->u.c.sym->components;
980 comp = expr->ts.u.derived->components;
982 /* See if the user is trying to invoke a structure constructor for one of
983 the iso_c_binding derived types. */
984 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
985 && expr->ts.u.derived->ts.is_iso_c && cons
986 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
988 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
989 expr->ts.u.derived->name, &(expr->where));
993 /* Return if structure constructor is c_null_(fun)prt. */
994 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
995 && expr->ts.u.derived->ts.is_iso_c && cons
996 && cons->expr && cons->expr->expr_type == EXPR_NULL)
999 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
1006 if (gfc_resolve_expr (cons->expr) == FAILURE)
1012 rank = comp->as ? comp->as->rank : 0;
1013 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
1014 && (comp->attr.allocatable || cons->expr->rank))
1016 gfc_error ("The rank of the element in the derived type "
1017 "constructor at %L does not match that of the "
1018 "component (%d/%d)", &cons->expr->where,
1019 cons->expr->rank, rank);
1023 /* If we don't have the right type, try to convert it. */
1025 if (!comp->attr.proc_pointer &&
1026 !gfc_compare_types (&cons->expr->ts, &comp->ts))
1029 if (strcmp (comp->name, "_extends") == 0)
1031 /* Can afford to be brutal with the _extends initializer.
1032 The derived type can get lost because it is PRIVATE
1033 but it is not usage constrained by the standard. */
1034 cons->expr->ts = comp->ts;
1037 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
1038 gfc_error ("The element in the derived type constructor at %L, "
1039 "for pointer component '%s', is %s but should be %s",
1040 &cons->expr->where, comp->name,
1041 gfc_basic_typename (cons->expr->ts.type),
1042 gfc_basic_typename (comp->ts.type));
1044 t = gfc_convert_type (cons->expr, &comp->ts, 1);
1047 /* For strings, the length of the constructor should be the same as
1048 the one of the structure, ensure this if the lengths are known at
1049 compile time and when we are dealing with PARAMETER or structure
1051 if (cons->expr->ts.type == BT_CHARACTER && comp->ts.u.cl
1052 && comp->ts.u.cl->length
1053 && comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
1054 && cons->expr->ts.u.cl && cons->expr->ts.u.cl->length
1055 && cons->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
1056 && mpz_cmp (cons->expr->ts.u.cl->length->value.integer,
1057 comp->ts.u.cl->length->value.integer) != 0)
1059 if (cons->expr->expr_type == EXPR_VARIABLE
1060 && cons->expr->symtree->n.sym->attr.flavor == FL_PARAMETER)
1062 /* Wrap the parameter in an array constructor (EXPR_ARRAY)
1063 to make use of the gfc_resolve_character_array_constructor
1064 machinery. The expression is later simplified away to
1065 an array of string literals. */
1066 gfc_expr *para = cons->expr;
1067 cons->expr = gfc_get_expr ();
1068 cons->expr->ts = para->ts;
1069 cons->expr->where = para->where;
1070 cons->expr->expr_type = EXPR_ARRAY;
1071 cons->expr->rank = para->rank;
1072 cons->expr->shape = gfc_copy_shape (para->shape, para->rank);
1073 gfc_constructor_append_expr (&cons->expr->value.constructor,
1074 para, &cons->expr->where);
1076 if (cons->expr->expr_type == EXPR_ARRAY)
1079 p = gfc_constructor_first (cons->expr->value.constructor);
1080 if (cons->expr->ts.u.cl != p->expr->ts.u.cl)
1082 gfc_charlen *cl, *cl2;
1085 for (cl = gfc_current_ns->cl_list; cl; cl = cl->next)
1087 if (cl == cons->expr->ts.u.cl)
1095 cl2->next = cl->next;
1097 gfc_free_expr (cl->length);
1101 cons->expr->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1102 cons->expr->ts.u.cl->length_from_typespec = true;
1103 cons->expr->ts.u.cl->length = gfc_copy_expr (comp->ts.u.cl->length);
1104 gfc_resolve_character_array_constructor (cons->expr);
1108 if (cons->expr->expr_type == EXPR_NULL
1109 && !(comp->attr.pointer || comp->attr.allocatable
1110 || comp->attr.proc_pointer
1111 || (comp->ts.type == BT_CLASS
1112 && (CLASS_DATA (comp)->attr.class_pointer
1113 || CLASS_DATA (comp)->attr.allocatable))))
1116 gfc_error ("The NULL in the derived type constructor at %L is "
1117 "being applied to component '%s', which is neither "
1118 "a POINTER nor ALLOCATABLE", &cons->expr->where,
1122 if (!comp->attr.pointer || comp->attr.proc_pointer
1123 || cons->expr->expr_type == EXPR_NULL)
1126 a = gfc_expr_attr (cons->expr);
1128 if (!a.pointer && !a.target)
1131 gfc_error ("The element in the derived type constructor at %L, "
1132 "for pointer component '%s' should be a POINTER or "
1133 "a TARGET", &cons->expr->where, comp->name);
1138 /* F08:C461. Additional checks for pointer initialization. */
1142 gfc_error ("Pointer initialization target at %L "
1143 "must not be ALLOCATABLE ", &cons->expr->where);
1148 gfc_error ("Pointer initialization target at %L "
1149 "must have the SAVE attribute", &cons->expr->where);
1153 /* F2003, C1272 (3). */
1154 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
1155 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1156 || gfc_is_coindexed (cons->expr)))
1159 gfc_error ("Invalid expression in the derived type constructor for "
1160 "pointer component '%s' at %L in PURE procedure",
1161 comp->name, &cons->expr->where);
1164 if (gfc_implicit_pure (NULL)
1165 && cons->expr->expr_type == EXPR_VARIABLE
1166 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1167 || gfc_is_coindexed (cons->expr)))
1168 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1176 /****************** Expression name resolution ******************/
1178 /* Returns 0 if a symbol was not declared with a type or
1179 attribute declaration statement, nonzero otherwise. */
1182 was_declared (gfc_symbol *sym)
1188 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
1191 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
1192 || a.optional || a.pointer || a.save || a.target || a.volatile_
1193 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
1194 || a.asynchronous || a.codimension)
1201 /* Determine if a symbol is generic or not. */
1204 generic_sym (gfc_symbol *sym)
1208 if (sym->attr.generic ||
1209 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
1212 if (was_declared (sym) || sym->ns->parent == NULL)
1215 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1222 return generic_sym (s);
1229 /* Determine if a symbol is specific or not. */
1232 specific_sym (gfc_symbol *sym)
1236 if (sym->attr.if_source == IFSRC_IFBODY
1237 || sym->attr.proc == PROC_MODULE
1238 || sym->attr.proc == PROC_INTERNAL
1239 || sym->attr.proc == PROC_ST_FUNCTION
1240 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1241 || sym->attr.external)
1244 if (was_declared (sym) || sym->ns->parent == NULL)
1247 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1249 return (s == NULL) ? 0 : specific_sym (s);
1253 /* Figure out if the procedure is specific, generic or unknown. */
1256 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1260 procedure_kind (gfc_symbol *sym)
1262 if (generic_sym (sym))
1263 return PTYPE_GENERIC;
1265 if (specific_sym (sym))
1266 return PTYPE_SPECIFIC;
1268 return PTYPE_UNKNOWN;
1271 /* Check references to assumed size arrays. The flag need_full_assumed_size
1272 is nonzero when matching actual arguments. */
1274 static int need_full_assumed_size = 0;
1277 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1279 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1282 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1283 What should it be? */
1284 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1285 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1286 && (e->ref->u.ar.type == AR_FULL))
1288 gfc_error ("The upper bound in the last dimension must "
1289 "appear in the reference to the assumed size "
1290 "array '%s' at %L", sym->name, &e->where);
1297 /* Look for bad assumed size array references in argument expressions
1298 of elemental and array valued intrinsic procedures. Since this is
1299 called from procedure resolution functions, it only recurses at
1303 resolve_assumed_size_actual (gfc_expr *e)
1308 switch (e->expr_type)
1311 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1316 if (resolve_assumed_size_actual (e->value.op.op1)
1317 || resolve_assumed_size_actual (e->value.op.op2))
1328 /* Check a generic procedure, passed as an actual argument, to see if
1329 there is a matching specific name. If none, it is an error, and if
1330 more than one, the reference is ambiguous. */
1332 count_specific_procs (gfc_expr *e)
1339 sym = e->symtree->n.sym;
1341 for (p = sym->generic; p; p = p->next)
1342 if (strcmp (sym->name, p->sym->name) == 0)
1344 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1350 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1354 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1355 "argument at %L", sym->name, &e->where);
1361 /* See if a call to sym could possibly be a not allowed RECURSION because of
1362 a missing RECURIVE declaration. This means that either sym is the current
1363 context itself, or sym is the parent of a contained procedure calling its
1364 non-RECURSIVE containing procedure.
1365 This also works if sym is an ENTRY. */
1368 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1370 gfc_symbol* proc_sym;
1371 gfc_symbol* context_proc;
1372 gfc_namespace* real_context;
1374 if (sym->attr.flavor == FL_PROGRAM)
1377 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1379 /* If we've got an ENTRY, find real procedure. */
1380 if (sym->attr.entry && sym->ns->entries)
1381 proc_sym = sym->ns->entries->sym;
1385 /* If sym is RECURSIVE, all is well of course. */
1386 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1389 /* Find the context procedure's "real" symbol if it has entries.
1390 We look for a procedure symbol, so recurse on the parents if we don't
1391 find one (like in case of a BLOCK construct). */
1392 for (real_context = context; ; real_context = real_context->parent)
1394 /* We should find something, eventually! */
1395 gcc_assert (real_context);
1397 context_proc = (real_context->entries ? real_context->entries->sym
1398 : real_context->proc_name);
1400 /* In some special cases, there may not be a proc_name, like for this
1402 real(bad_kind()) function foo () ...
1403 when checking the call to bad_kind ().
1404 In these cases, we simply return here and assume that the
1409 if (context_proc->attr.flavor != FL_LABEL)
1413 /* A call from sym's body to itself is recursion, of course. */
1414 if (context_proc == proc_sym)
1417 /* The same is true if context is a contained procedure and sym the
1419 if (context_proc->attr.contained)
1421 gfc_symbol* parent_proc;
1423 gcc_assert (context->parent);
1424 parent_proc = (context->parent->entries ? context->parent->entries->sym
1425 : context->parent->proc_name);
1427 if (parent_proc == proc_sym)
1435 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1436 its typespec and formal argument list. */
1439 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1441 gfc_intrinsic_sym* isym = NULL;
1447 /* Already resolved. */
1448 if (sym->from_intmod && sym->ts.type != BT_UNKNOWN)
1451 /* We already know this one is an intrinsic, so we don't call
1452 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1453 gfc_find_subroutine directly to check whether it is a function or
1456 if (sym->intmod_sym_id)
1457 isym = gfc_intrinsic_function_by_id ((gfc_isym_id) sym->intmod_sym_id);
1459 isym = gfc_find_function (sym->name);
1463 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1464 && !sym->attr.implicit_type)
1465 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1466 " ignored", sym->name, &sym->declared_at);
1468 if (!sym->attr.function &&
1469 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1474 else if ((isym = gfc_find_subroutine (sym->name)))
1476 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1478 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1479 " specifier", sym->name, &sym->declared_at);
1483 if (!sym->attr.subroutine &&
1484 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1489 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1494 gfc_copy_formal_args_intr (sym, isym);
1496 /* Check it is actually available in the standard settings. */
1497 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1500 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1501 " available in the current standard settings but %s. Use"
1502 " an appropriate -std=* option or enable -fall-intrinsics"
1503 " in order to use it.",
1504 sym->name, &sym->declared_at, symstd);
1512 /* Resolve a procedure expression, like passing it to a called procedure or as
1513 RHS for a procedure pointer assignment. */
1516 resolve_procedure_expression (gfc_expr* expr)
1520 if (expr->expr_type != EXPR_VARIABLE)
1522 gcc_assert (expr->symtree);
1524 sym = expr->symtree->n.sym;
1526 if (sym->attr.intrinsic)
1527 resolve_intrinsic (sym, &expr->where);
1529 if (sym->attr.flavor != FL_PROCEDURE
1530 || (sym->attr.function && sym->result == sym))
1533 /* A non-RECURSIVE procedure that is used as procedure expression within its
1534 own body is in danger of being called recursively. */
1535 if (is_illegal_recursion (sym, gfc_current_ns))
1536 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1537 " itself recursively. Declare it RECURSIVE or use"
1538 " -frecursive", sym->name, &expr->where);
1544 /* Resolve an actual argument list. Most of the time, this is just
1545 resolving the expressions in the list.
1546 The exception is that we sometimes have to decide whether arguments
1547 that look like procedure arguments are really simple variable
1551 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1552 bool no_formal_args)
1555 gfc_symtree *parent_st;
1557 int save_need_full_assumed_size;
1559 for (; arg; arg = arg->next)
1564 /* Check the label is a valid branching target. */
1567 if (arg->label->defined == ST_LABEL_UNKNOWN)
1569 gfc_error ("Label %d referenced at %L is never defined",
1570 arg->label->value, &arg->label->where);
1577 if (e->expr_type == EXPR_VARIABLE
1578 && e->symtree->n.sym->attr.generic
1580 && count_specific_procs (e) != 1)
1583 if (e->ts.type != BT_PROCEDURE)
1585 save_need_full_assumed_size = need_full_assumed_size;
1586 if (e->expr_type != EXPR_VARIABLE)
1587 need_full_assumed_size = 0;
1588 if (gfc_resolve_expr (e) != SUCCESS)
1590 need_full_assumed_size = save_need_full_assumed_size;
1594 /* See if the expression node should really be a variable reference. */
1596 sym = e->symtree->n.sym;
1598 if (sym->attr.flavor == FL_PROCEDURE
1599 || sym->attr.intrinsic
1600 || sym->attr.external)
1604 /* If a procedure is not already determined to be something else
1605 check if it is intrinsic. */
1606 if (!sym->attr.intrinsic
1607 && !(sym->attr.external || sym->attr.use_assoc
1608 || sym->attr.if_source == IFSRC_IFBODY)
1609 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1610 sym->attr.intrinsic = 1;
1612 if (sym->attr.proc == PROC_ST_FUNCTION)
1614 gfc_error ("Statement function '%s' at %L is not allowed as an "
1615 "actual argument", sym->name, &e->where);
1618 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1619 sym->attr.subroutine);
1620 if (sym->attr.intrinsic && actual_ok == 0)
1622 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1623 "actual argument", sym->name, &e->where);
1626 if (sym->attr.contained && !sym->attr.use_assoc
1627 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1629 if (gfc_notify_std (GFC_STD_F2008,
1630 "Fortran 2008: Internal procedure '%s' is"
1631 " used as actual argument at %L",
1632 sym->name, &e->where) == FAILURE)
1636 if (sym->attr.elemental && !sym->attr.intrinsic)
1638 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1639 "allowed as an actual argument at %L", sym->name,
1643 /* Check if a generic interface has a specific procedure
1644 with the same name before emitting an error. */
1645 if (sym->attr.generic && count_specific_procs (e) != 1)
1648 /* Just in case a specific was found for the expression. */
1649 sym = e->symtree->n.sym;
1651 /* If the symbol is the function that names the current (or
1652 parent) scope, then we really have a variable reference. */
1654 if (gfc_is_function_return_value (sym, sym->ns))
1657 /* If all else fails, see if we have a specific intrinsic. */
1658 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1660 gfc_intrinsic_sym *isym;
1662 isym = gfc_find_function (sym->name);
1663 if (isym == NULL || !isym->specific)
1665 gfc_error ("Unable to find a specific INTRINSIC procedure "
1666 "for the reference '%s' at %L", sym->name,
1671 sym->attr.intrinsic = 1;
1672 sym->attr.function = 1;
1675 if (gfc_resolve_expr (e) == FAILURE)
1680 /* See if the name is a module procedure in a parent unit. */
1682 if (was_declared (sym) || sym->ns->parent == NULL)
1685 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1687 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1691 if (parent_st == NULL)
1694 sym = parent_st->n.sym;
1695 e->symtree = parent_st; /* Point to the right thing. */
1697 if (sym->attr.flavor == FL_PROCEDURE
1698 || sym->attr.intrinsic
1699 || sym->attr.external)
1701 if (gfc_resolve_expr (e) == FAILURE)
1707 e->expr_type = EXPR_VARIABLE;
1709 if (sym->as != NULL)
1711 e->rank = sym->as->rank;
1712 e->ref = gfc_get_ref ();
1713 e->ref->type = REF_ARRAY;
1714 e->ref->u.ar.type = AR_FULL;
1715 e->ref->u.ar.as = sym->as;
1718 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1719 primary.c (match_actual_arg). If above code determines that it
1720 is a variable instead, it needs to be resolved as it was not
1721 done at the beginning of this function. */
1722 save_need_full_assumed_size = need_full_assumed_size;
1723 if (e->expr_type != EXPR_VARIABLE)
1724 need_full_assumed_size = 0;
1725 if (gfc_resolve_expr (e) != SUCCESS)
1727 need_full_assumed_size = save_need_full_assumed_size;
1730 /* Check argument list functions %VAL, %LOC and %REF. There is
1731 nothing to do for %REF. */
1732 if (arg->name && arg->name[0] == '%')
1734 if (strncmp ("%VAL", arg->name, 4) == 0)
1736 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1738 gfc_error ("By-value argument at %L is not of numeric "
1745 gfc_error ("By-value argument at %L cannot be an array or "
1746 "an array section", &e->where);
1750 /* Intrinsics are still PROC_UNKNOWN here. However,
1751 since same file external procedures are not resolvable
1752 in gfortran, it is a good deal easier to leave them to
1754 if (ptype != PROC_UNKNOWN
1755 && ptype != PROC_DUMMY
1756 && ptype != PROC_EXTERNAL
1757 && ptype != PROC_MODULE)
1759 gfc_error ("By-value argument at %L is not allowed "
1760 "in this context", &e->where);
1765 /* Statement functions have already been excluded above. */
1766 else if (strncmp ("%LOC", arg->name, 4) == 0
1767 && e->ts.type == BT_PROCEDURE)
1769 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1771 gfc_error ("Passing internal procedure at %L by location "
1772 "not allowed", &e->where);
1778 /* Fortran 2008, C1237. */
1779 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1780 && gfc_has_ultimate_pointer (e))
1782 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1783 "component", &e->where);
1792 /* Do the checks of the actual argument list that are specific to elemental
1793 procedures. If called with c == NULL, we have a function, otherwise if
1794 expr == NULL, we have a subroutine. */
1797 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1799 gfc_actual_arglist *arg0;
1800 gfc_actual_arglist *arg;
1801 gfc_symbol *esym = NULL;
1802 gfc_intrinsic_sym *isym = NULL;
1804 gfc_intrinsic_arg *iformal = NULL;
1805 gfc_formal_arglist *eformal = NULL;
1806 bool formal_optional = false;
1807 bool set_by_optional = false;
1811 /* Is this an elemental procedure? */
1812 if (expr && expr->value.function.actual != NULL)
1814 if (expr->value.function.esym != NULL
1815 && expr->value.function.esym->attr.elemental)
1817 arg0 = expr->value.function.actual;
1818 esym = expr->value.function.esym;
1820 else if (expr->value.function.isym != NULL
1821 && expr->value.function.isym->elemental)
1823 arg0 = expr->value.function.actual;
1824 isym = expr->value.function.isym;
1829 else if (c && c->ext.actual != NULL)
1831 arg0 = c->ext.actual;
1833 if (c->resolved_sym)
1834 esym = c->resolved_sym;
1836 esym = c->symtree->n.sym;
1839 if (!esym->attr.elemental)
1845 /* The rank of an elemental is the rank of its array argument(s). */
1846 for (arg = arg0; arg; arg = arg->next)
1848 if (arg->expr != NULL && arg->expr->rank > 0)
1850 rank = arg->expr->rank;
1851 if (arg->expr->expr_type == EXPR_VARIABLE
1852 && arg->expr->symtree->n.sym->attr.optional)
1853 set_by_optional = true;
1855 /* Function specific; set the result rank and shape. */
1859 if (!expr->shape && arg->expr->shape)
1861 expr->shape = gfc_get_shape (rank);
1862 for (i = 0; i < rank; i++)
1863 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1870 /* If it is an array, it shall not be supplied as an actual argument
1871 to an elemental procedure unless an array of the same rank is supplied
1872 as an actual argument corresponding to a nonoptional dummy argument of
1873 that elemental procedure(12.4.1.5). */
1874 formal_optional = false;
1876 iformal = isym->formal;
1878 eformal = esym->formal;
1880 for (arg = arg0; arg; arg = arg->next)
1884 if (eformal->sym && eformal->sym->attr.optional)
1885 formal_optional = true;
1886 eformal = eformal->next;
1888 else if (isym && iformal)
1890 if (iformal->optional)
1891 formal_optional = true;
1892 iformal = iformal->next;
1895 formal_optional = true;
1897 if (pedantic && arg->expr != NULL
1898 && arg->expr->expr_type == EXPR_VARIABLE
1899 && arg->expr->symtree->n.sym->attr.optional
1902 && (set_by_optional || arg->expr->rank != rank)
1903 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1905 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1906 "MISSING, it cannot be the actual argument of an "
1907 "ELEMENTAL procedure unless there is a non-optional "
1908 "argument with the same rank (12.4.1.5)",
1909 arg->expr->symtree->n.sym->name, &arg->expr->where);
1914 for (arg = arg0; arg; arg = arg->next)
1916 if (arg->expr == NULL || arg->expr->rank == 0)
1919 /* Being elemental, the last upper bound of an assumed size array
1920 argument must be present. */
1921 if (resolve_assumed_size_actual (arg->expr))
1924 /* Elemental procedure's array actual arguments must conform. */
1927 if (gfc_check_conformance (arg->expr, e,
1928 "elemental procedure") == FAILURE)
1935 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1936 is an array, the intent inout/out variable needs to be also an array. */
1937 if (rank > 0 && esym && expr == NULL)
1938 for (eformal = esym->formal, arg = arg0; arg && eformal;
1939 arg = arg->next, eformal = eformal->next)
1940 if ((eformal->sym->attr.intent == INTENT_OUT
1941 || eformal->sym->attr.intent == INTENT_INOUT)
1942 && arg->expr && arg->expr->rank == 0)
1944 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1945 "ELEMENTAL subroutine '%s' is a scalar, but another "
1946 "actual argument is an array", &arg->expr->where,
1947 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1948 : "INOUT", eformal->sym->name, esym->name);
1955 /* This function does the checking of references to global procedures
1956 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1957 77 and 95 standards. It checks for a gsymbol for the name, making
1958 one if it does not already exist. If it already exists, then the
1959 reference being resolved must correspond to the type of gsymbol.
1960 Otherwise, the new symbol is equipped with the attributes of the
1961 reference. The corresponding code that is called in creating
1962 global entities is parse.c.
1964 In addition, for all but -std=legacy, the gsymbols are used to
1965 check the interfaces of external procedures from the same file.
1966 The namespace of the gsymbol is resolved and then, once this is
1967 done the interface is checked. */
1971 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1973 if (!gsym_ns->proc_name->attr.recursive)
1976 if (sym->ns == gsym_ns)
1979 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1986 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1988 if (gsym_ns->entries)
1990 gfc_entry_list *entry = gsym_ns->entries;
1992 for (; entry; entry = entry->next)
1994 if (strcmp (sym->name, entry->sym->name) == 0)
1996 if (strcmp (gsym_ns->proc_name->name,
1997 sym->ns->proc_name->name) == 0)
2001 && strcmp (gsym_ns->proc_name->name,
2002 sym->ns->parent->proc_name->name) == 0)
2011 resolve_global_procedure (gfc_symbol *sym, locus *where,
2012 gfc_actual_arglist **actual, int sub)
2016 enum gfc_symbol_type type;
2018 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
2020 gsym = gfc_get_gsymbol (sym->name);
2022 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
2023 gfc_global_used (gsym, where);
2025 if (gfc_option.flag_whole_file
2026 && (sym->attr.if_source == IFSRC_UNKNOWN
2027 || sym->attr.if_source == IFSRC_IFBODY)
2028 && gsym->type != GSYM_UNKNOWN
2030 && gsym->ns->resolved != -1
2031 && gsym->ns->proc_name
2032 && not_in_recursive (sym, gsym->ns)
2033 && not_entry_self_reference (sym, gsym->ns))
2035 gfc_symbol *def_sym;
2037 /* Resolve the gsymbol namespace if needed. */
2038 if (!gsym->ns->resolved)
2040 gfc_dt_list *old_dt_list;
2041 struct gfc_omp_saved_state old_omp_state;
2043 /* Stash away derived types so that the backend_decls do not
2045 old_dt_list = gfc_derived_types;
2046 gfc_derived_types = NULL;
2047 /* And stash away openmp state. */
2048 gfc_omp_save_and_clear_state (&old_omp_state);
2050 gfc_resolve (gsym->ns);
2052 /* Store the new derived types with the global namespace. */
2053 if (gfc_derived_types)
2054 gsym->ns->derived_types = gfc_derived_types;
2056 /* Restore the derived types of this namespace. */
2057 gfc_derived_types = old_dt_list;
2058 /* And openmp state. */
2059 gfc_omp_restore_state (&old_omp_state);
2062 /* Make sure that translation for the gsymbol occurs before
2063 the procedure currently being resolved. */
2064 ns = gfc_global_ns_list;
2065 for (; ns && ns != gsym->ns; ns = ns->sibling)
2067 if (ns->sibling == gsym->ns)
2069 ns->sibling = gsym->ns->sibling;
2070 gsym->ns->sibling = gfc_global_ns_list;
2071 gfc_global_ns_list = gsym->ns;
2076 def_sym = gsym->ns->proc_name;
2077 if (def_sym->attr.entry_master)
2079 gfc_entry_list *entry;
2080 for (entry = gsym->ns->entries; entry; entry = entry->next)
2081 if (strcmp (entry->sym->name, sym->name) == 0)
2083 def_sym = entry->sym;
2088 /* Differences in constant character lengths. */
2089 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
2091 long int l1 = 0, l2 = 0;
2092 gfc_charlen *cl1 = sym->ts.u.cl;
2093 gfc_charlen *cl2 = def_sym->ts.u.cl;
2096 && cl1->length != NULL
2097 && cl1->length->expr_type == EXPR_CONSTANT)
2098 l1 = mpz_get_si (cl1->length->value.integer);
2101 && cl2->length != NULL
2102 && cl2->length->expr_type == EXPR_CONSTANT)
2103 l2 = mpz_get_si (cl2->length->value.integer);
2105 if (l1 && l2 && l1 != l2)
2106 gfc_error ("Character length mismatch in return type of "
2107 "function '%s' at %L (%ld/%ld)", sym->name,
2108 &sym->declared_at, l1, l2);
2111 /* Type mismatch of function return type and expected type. */
2112 if (sym->attr.function
2113 && !gfc_compare_types (&sym->ts, &def_sym->ts))
2114 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
2115 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
2116 gfc_typename (&def_sym->ts));
2118 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
2120 gfc_formal_arglist *arg = def_sym->formal;
2121 for ( ; arg; arg = arg->next)
2124 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
2125 else if (arg->sym->attr.allocatable
2126 || arg->sym->attr.asynchronous
2127 || arg->sym->attr.optional
2128 || arg->sym->attr.pointer
2129 || arg->sym->attr.target
2130 || arg->sym->attr.value
2131 || arg->sym->attr.volatile_)
2133 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
2134 "has an attribute that requires an explicit "
2135 "interface for this procedure", arg->sym->name,
2136 sym->name, &sym->declared_at);
2139 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
2140 else if (arg->sym && arg->sym->as
2141 && arg->sym->as->type == AS_ASSUMED_SHAPE)
2143 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
2144 "argument '%s' must have an explicit interface",
2145 sym->name, &sym->declared_at, arg->sym->name);
2148 /* F2008, 12.4.2.2 (2c) */
2149 else if (arg->sym->attr.codimension)
2151 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
2152 "'%s' must have an explicit interface",
2153 sym->name, &sym->declared_at, arg->sym->name);
2156 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
2157 else if (false) /* TODO: is a parametrized derived type */
2159 gfc_error ("Procedure '%s' at %L with parametrized derived "
2160 "type argument '%s' must have an explicit "
2161 "interface", sym->name, &sym->declared_at,
2165 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
2166 else if (arg->sym->ts.type == BT_CLASS)
2168 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
2169 "argument '%s' must have an explicit interface",
2170 sym->name, &sym->declared_at, arg->sym->name);
2175 if (def_sym->attr.function)
2177 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
2178 if (def_sym->as && def_sym->as->rank
2179 && (!sym->as || sym->as->rank != def_sym->as->rank))
2180 gfc_error ("The reference to function '%s' at %L either needs an "
2181 "explicit INTERFACE or the rank is incorrect", sym->name,
2184 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
2185 if ((def_sym->result->attr.pointer
2186 || def_sym->result->attr.allocatable)
2187 && (sym->attr.if_source != IFSRC_IFBODY
2188 || def_sym->result->attr.pointer
2189 != sym->result->attr.pointer
2190 || def_sym->result->attr.allocatable
2191 != sym->result->attr.allocatable))
2192 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
2193 "result must have an explicit interface", sym->name,
2196 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
2197 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
2198 && def_sym->ts.type == BT_CHARACTER && def_sym->ts.u.cl->length != NULL)
2200 gfc_charlen *cl = sym->ts.u.cl;
2202 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
2203 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
2205 gfc_error ("Nonconstant character-length function '%s' at %L "
2206 "must have an explicit interface", sym->name,
2212 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2213 if (def_sym->attr.elemental && !sym->attr.elemental)
2215 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2216 "interface", sym->name, &sym->declared_at);
2219 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2220 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2222 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2223 "an explicit interface", sym->name, &sym->declared_at);
2226 if (gfc_option.flag_whole_file == 1
2227 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2228 && !(gfc_option.warn_std & GFC_STD_GNU)))
2229 gfc_errors_to_warnings (1);
2231 if (sym->attr.if_source != IFSRC_IFBODY)
2232 gfc_procedure_use (def_sym, actual, where);
2234 gfc_errors_to_warnings (0);
2237 if (gsym->type == GSYM_UNKNOWN)
2240 gsym->where = *where;
2247 /************* Function resolution *************/
2249 /* Resolve a function call known to be generic.
2250 Section 14.1.2.4.1. */
2253 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2257 if (sym->attr.generic)
2259 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2262 expr->value.function.name = s->name;
2263 expr->value.function.esym = s;
2265 if (s->ts.type != BT_UNKNOWN)
2267 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2268 expr->ts = s->result->ts;
2271 expr->rank = s->as->rank;
2272 else if (s->result != NULL && s->result->as != NULL)
2273 expr->rank = s->result->as->rank;
2275 gfc_set_sym_referenced (expr->value.function.esym);
2280 /* TODO: Need to search for elemental references in generic
2284 if (sym->attr.intrinsic)
2285 return gfc_intrinsic_func_interface (expr, 0);
2292 resolve_generic_f (gfc_expr *expr)
2297 sym = expr->symtree->n.sym;
2301 m = resolve_generic_f0 (expr, sym);
2304 else if (m == MATCH_ERROR)
2308 if (sym->ns->parent == NULL)
2310 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2314 if (!generic_sym (sym))
2318 /* Last ditch attempt. See if the reference is to an intrinsic
2319 that possesses a matching interface. 14.1.2.4 */
2320 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2322 gfc_error ("There is no specific function for the generic '%s' at %L",
2323 expr->symtree->n.sym->name, &expr->where);
2327 m = gfc_intrinsic_func_interface (expr, 0);
2331 gfc_error ("Generic function '%s' at %L is not consistent with a "
2332 "specific intrinsic interface", expr->symtree->n.sym->name,
2339 /* Resolve a function call known to be specific. */
2342 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2346 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2348 if (sym->attr.dummy)
2350 sym->attr.proc = PROC_DUMMY;
2354 sym->attr.proc = PROC_EXTERNAL;
2358 if (sym->attr.proc == PROC_MODULE
2359 || sym->attr.proc == PROC_ST_FUNCTION
2360 || sym->attr.proc == PROC_INTERNAL)
2363 if (sym->attr.intrinsic)
2365 m = gfc_intrinsic_func_interface (expr, 1);
2369 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2370 "with an intrinsic", sym->name, &expr->where);
2378 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2381 expr->ts = sym->result->ts;
2384 expr->value.function.name = sym->name;
2385 expr->value.function.esym = sym;
2386 if (sym->as != NULL)
2387 expr->rank = sym->as->rank;
2394 resolve_specific_f (gfc_expr *expr)
2399 sym = expr->symtree->n.sym;
2403 m = resolve_specific_f0 (sym, expr);
2406 if (m == MATCH_ERROR)
2409 if (sym->ns->parent == NULL)
2412 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2418 gfc_error ("Unable to resolve the specific function '%s' at %L",
2419 expr->symtree->n.sym->name, &expr->where);
2425 /* Resolve a procedure call not known to be generic nor specific. */
2428 resolve_unknown_f (gfc_expr *expr)
2433 sym = expr->symtree->n.sym;
2435 if (sym->attr.dummy)
2437 sym->attr.proc = PROC_DUMMY;
2438 expr->value.function.name = sym->name;
2442 /* See if we have an intrinsic function reference. */
2444 if (gfc_is_intrinsic (sym, 0, expr->where))
2446 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2451 /* The reference is to an external name. */
2453 sym->attr.proc = PROC_EXTERNAL;
2454 expr->value.function.name = sym->name;
2455 expr->value.function.esym = expr->symtree->n.sym;
2457 if (sym->as != NULL)
2458 expr->rank = sym->as->rank;
2460 /* Type of the expression is either the type of the symbol or the
2461 default type of the symbol. */
2464 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2466 if (sym->ts.type != BT_UNKNOWN)
2470 ts = gfc_get_default_type (sym->name, sym->ns);
2472 if (ts->type == BT_UNKNOWN)
2474 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2475 sym->name, &expr->where);
2486 /* Return true, if the symbol is an external procedure. */
2488 is_external_proc (gfc_symbol *sym)
2490 if (!sym->attr.dummy && !sym->attr.contained
2491 && !(sym->attr.intrinsic
2492 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2493 && sym->attr.proc != PROC_ST_FUNCTION
2494 && !sym->attr.proc_pointer
2495 && !sym->attr.use_assoc
2503 /* Figure out if a function reference is pure or not. Also set the name
2504 of the function for a potential error message. Return nonzero if the
2505 function is PURE, zero if not. */
2507 pure_stmt_function (gfc_expr *, gfc_symbol *);
2510 pure_function (gfc_expr *e, const char **name)
2516 if (e->symtree != NULL
2517 && e->symtree->n.sym != NULL
2518 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2519 return pure_stmt_function (e, e->symtree->n.sym);
2521 if (e->value.function.esym)
2523 pure = gfc_pure (e->value.function.esym);
2524 *name = e->value.function.esym->name;
2526 else if (e->value.function.isym)
2528 pure = e->value.function.isym->pure
2529 || e->value.function.isym->elemental;
2530 *name = e->value.function.isym->name;
2534 /* Implicit functions are not pure. */
2536 *name = e->value.function.name;
2544 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2545 int *f ATTRIBUTE_UNUSED)
2549 /* Don't bother recursing into other statement functions
2550 since they will be checked individually for purity. */
2551 if (e->expr_type != EXPR_FUNCTION
2553 || e->symtree->n.sym == sym
2554 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2557 return pure_function (e, &name) ? false : true;
2562 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2564 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2569 is_scalar_expr_ptr (gfc_expr *expr)
2571 gfc_try retval = SUCCESS;
2576 /* See if we have a gfc_ref, which means we have a substring, array
2577 reference, or a component. */
2578 if (expr->ref != NULL)
2581 while (ref->next != NULL)
2587 if (ref->u.ss.start == NULL || ref->u.ss.end == NULL
2588 || gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) != 0)
2593 if (ref->u.ar.type == AR_ELEMENT)
2595 else if (ref->u.ar.type == AR_FULL)
2597 /* The user can give a full array if the array is of size 1. */
2598 if (ref->u.ar.as != NULL
2599 && ref->u.ar.as->rank == 1
2600 && ref->u.ar.as->type == AS_EXPLICIT
2601 && ref->u.ar.as->lower[0] != NULL
2602 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2603 && ref->u.ar.as->upper[0] != NULL
2604 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2606 /* If we have a character string, we need to check if
2607 its length is one. */
2608 if (expr->ts.type == BT_CHARACTER)
2610 if (expr->ts.u.cl == NULL
2611 || expr->ts.u.cl->length == NULL
2612 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2618 /* We have constant lower and upper bounds. If the
2619 difference between is 1, it can be considered a
2621 FIXME: Use gfc_dep_compare_expr instead. */
2622 start = (int) mpz_get_si
2623 (ref->u.ar.as->lower[0]->value.integer);
2624 end = (int) mpz_get_si
2625 (ref->u.ar.as->upper[0]->value.integer);
2626 if (end - start + 1 != 1)
2641 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2643 /* Character string. Make sure it's of length 1. */
2644 if (expr->ts.u.cl == NULL
2645 || expr->ts.u.cl->length == NULL
2646 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2649 else if (expr->rank != 0)
2656 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2657 and, in the case of c_associated, set the binding label based on
2661 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2662 gfc_symbol **new_sym)
2664 char name[GFC_MAX_SYMBOL_LEN + 1];
2665 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2666 int optional_arg = 0;
2667 gfc_try retval = SUCCESS;
2668 gfc_symbol *args_sym;
2669 gfc_typespec *arg_ts;
2670 symbol_attribute arg_attr;
2672 if (args->expr->expr_type == EXPR_CONSTANT
2673 || args->expr->expr_type == EXPR_OP
2674 || args->expr->expr_type == EXPR_NULL)
2676 gfc_error ("Argument to '%s' at %L is not a variable",
2677 sym->name, &(args->expr->where));
2681 args_sym = args->expr->symtree->n.sym;
2683 /* The typespec for the actual arg should be that stored in the expr
2684 and not necessarily that of the expr symbol (args_sym), because
2685 the actual expression could be a part-ref of the expr symbol. */
2686 arg_ts = &(args->expr->ts);
2687 arg_attr = gfc_expr_attr (args->expr);
2689 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2691 /* If the user gave two args then they are providing something for
2692 the optional arg (the second cptr). Therefore, set the name and
2693 binding label to the c_associated for two cptrs. Otherwise,
2694 set c_associated to expect one cptr. */
2698 sprintf (name, "%s_2", sym->name);
2699 sprintf (binding_label, "%s_2", sym->binding_label);
2705 sprintf (name, "%s_1", sym->name);
2706 sprintf (binding_label, "%s_1", sym->binding_label);
2710 /* Get a new symbol for the version of c_associated that
2712 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2714 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2715 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2717 sprintf (name, "%s", sym->name);
2718 sprintf (binding_label, "%s", sym->binding_label);
2720 /* Error check the call. */
2721 if (args->next != NULL)
2723 gfc_error_now ("More actual than formal arguments in '%s' "
2724 "call at %L", name, &(args->expr->where));
2727 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2732 /* Make sure we have either the target or pointer attribute. */
2733 if (!arg_attr.target && !arg_attr.pointer)
2735 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2736 "a TARGET or an associated pointer",
2738 sym->name, &(args->expr->where));
2742 if (gfc_is_coindexed (args->expr))
2744 gfc_error_now ("Coindexed argument not permitted"
2745 " in '%s' call at %L", name,
2746 &(args->expr->where));
2750 /* Follow references to make sure there are no array
2752 seen_section = false;
2754 for (ref=args->expr->ref; ref; ref = ref->next)
2756 if (ref->type == REF_ARRAY)
2758 if (ref->u.ar.type == AR_SECTION)
2759 seen_section = true;
2761 if (ref->u.ar.type != AR_ELEMENT)
2764 for (r = ref->next; r; r=r->next)
2765 if (r->type == REF_COMPONENT)
2767 gfc_error_now ("Array section not permitted"
2768 " in '%s' call at %L", name,
2769 &(args->expr->where));
2777 if (seen_section && retval == SUCCESS)
2778 gfc_warning ("Array section in '%s' call at %L", name,
2779 &(args->expr->where));
2781 /* See if we have interoperable type and type param. */
2782 if (verify_c_interop (arg_ts) == SUCCESS
2783 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2785 if (args_sym->attr.target == 1)
2787 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2788 has the target attribute and is interoperable. */
2789 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2790 allocatable variable that has the TARGET attribute and
2791 is not an array of zero size. */
2792 if (args_sym->attr.allocatable == 1)
2794 if (args_sym->attr.dimension != 0
2795 && (args_sym->as && args_sym->as->rank == 0))
2797 gfc_error_now ("Allocatable variable '%s' used as a "
2798 "parameter to '%s' at %L must not be "
2799 "an array of zero size",
2800 args_sym->name, sym->name,
2801 &(args->expr->where));
2807 /* A non-allocatable target variable with C
2808 interoperable type and type parameters must be
2810 if (args_sym && args_sym->attr.dimension)
2812 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2814 gfc_error ("Assumed-shape array '%s' at %L "
2815 "cannot be an argument to the "
2816 "procedure '%s' because "
2817 "it is not C interoperable",
2819 &(args->expr->where), sym->name);
2822 else if (args_sym->as->type == AS_DEFERRED)
2824 gfc_error ("Deferred-shape array '%s' at %L "
2825 "cannot be an argument to the "
2826 "procedure '%s' because "
2827 "it is not C interoperable",
2829 &(args->expr->where), sym->name);
2834 /* Make sure it's not a character string. Arrays of
2835 any type should be ok if the variable is of a C
2836 interoperable type. */
2837 if (arg_ts->type == BT_CHARACTER)
2838 if (arg_ts->u.cl != NULL
2839 && (arg_ts->u.cl->length == NULL
2840 || arg_ts->u.cl->length->expr_type
2843 (arg_ts->u.cl->length->value.integer, 1)
2845 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2847 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2848 "at %L must have a length of 1",
2849 args_sym->name, sym->name,
2850 &(args->expr->where));
2855 else if (arg_attr.pointer
2856 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2858 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2860 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2861 "associated scalar POINTER", args_sym->name,
2862 sym->name, &(args->expr->where));
2868 /* The parameter is not required to be C interoperable. If it
2869 is not C interoperable, it must be a nonpolymorphic scalar
2870 with no length type parameters. It still must have either
2871 the pointer or target attribute, and it can be
2872 allocatable (but must be allocated when c_loc is called). */
2873 if (args->expr->rank != 0
2874 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2876 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2877 "scalar", args_sym->name, sym->name,
2878 &(args->expr->where));
2881 else if (arg_ts->type == BT_CHARACTER
2882 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2884 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2885 "%L must have a length of 1",
2886 args_sym->name, sym->name,
2887 &(args->expr->where));
2890 else if (arg_ts->type == BT_CLASS)
2892 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2893 "polymorphic", args_sym->name, sym->name,
2894 &(args->expr->where));
2899 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2901 if (args_sym->attr.flavor != FL_PROCEDURE)
2903 /* TODO: Update this error message to allow for procedure
2904 pointers once they are implemented. */
2905 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2907 args_sym->name, sym->name,
2908 &(args->expr->where));
2911 else if (args_sym->attr.is_bind_c != 1)
2913 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2915 args_sym->name, sym->name,
2916 &(args->expr->where));
2921 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2926 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2927 "iso_c_binding function: '%s'!\n", sym->name);
2934 /* Resolve a function call, which means resolving the arguments, then figuring
2935 out which entity the name refers to. */
2938 resolve_function (gfc_expr *expr)
2940 gfc_actual_arglist *arg;
2945 procedure_type p = PROC_INTRINSIC;
2946 bool no_formal_args;
2950 sym = expr->symtree->n.sym;
2952 /* If this is a procedure pointer component, it has already been resolved. */
2953 if (gfc_is_proc_ptr_comp (expr, NULL))
2956 if (sym && sym->attr.intrinsic
2957 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2960 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2962 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2966 /* If this ia a deferred TBP with an abstract interface (which may
2967 of course be referenced), expr->value.function.esym will be set. */
2968 if (sym && sym->attr.abstract && !expr->value.function.esym)
2970 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2971 sym->name, &expr->where);
2975 /* Switch off assumed size checking and do this again for certain kinds
2976 of procedure, once the procedure itself is resolved. */
2977 need_full_assumed_size++;
2979 if (expr->symtree && expr->symtree->n.sym)
2980 p = expr->symtree->n.sym->attr.proc;
2982 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2983 inquiry_argument = true;
2984 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2986 if (resolve_actual_arglist (expr->value.function.actual,
2987 p, no_formal_args) == FAILURE)
2989 inquiry_argument = false;
2993 inquiry_argument = false;
2995 /* Need to setup the call to the correct c_associated, depending on
2996 the number of cptrs to user gives to compare. */
2997 if (sym && sym->attr.is_iso_c == 1)
2999 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
3003 /* Get the symtree for the new symbol (resolved func).
3004 the old one will be freed later, when it's no longer used. */
3005 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
3008 /* Resume assumed_size checking. */
3009 need_full_assumed_size--;
3011 /* If the procedure is external, check for usage. */
3012 if (sym && is_external_proc (sym))
3013 resolve_global_procedure (sym, &expr->where,
3014 &expr->value.function.actual, 0);
3016 if (sym && sym->ts.type == BT_CHARACTER
3018 && sym->ts.u.cl->length == NULL
3020 && !sym->ts.deferred
3021 && expr->value.function.esym == NULL
3022 && !sym->attr.contained)
3024 /* Internal procedures are taken care of in resolve_contained_fntype. */
3025 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
3026 "be used at %L since it is not a dummy argument",
3027 sym->name, &expr->where);
3031 /* See if function is already resolved. */
3033 if (expr->value.function.name != NULL)
3035 if (expr->ts.type == BT_UNKNOWN)
3041 /* Apply the rules of section 14.1.2. */
3043 switch (procedure_kind (sym))
3046 t = resolve_generic_f (expr);
3049 case PTYPE_SPECIFIC:
3050 t = resolve_specific_f (expr);
3054 t = resolve_unknown_f (expr);
3058 gfc_internal_error ("resolve_function(): bad function type");
3062 /* If the expression is still a function (it might have simplified),
3063 then we check to see if we are calling an elemental function. */
3065 if (expr->expr_type != EXPR_FUNCTION)
3068 temp = need_full_assumed_size;
3069 need_full_assumed_size = 0;
3071 if (resolve_elemental_actual (expr, NULL) == FAILURE)
3074 if (omp_workshare_flag
3075 && expr->value.function.esym
3076 && ! gfc_elemental (expr->value.function.esym))
3078 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
3079 "in WORKSHARE construct", expr->value.function.esym->name,
3084 #define GENERIC_ID expr->value.function.isym->id
3085 else if (expr->value.function.actual != NULL
3086 && expr->value.function.isym != NULL
3087 && GENERIC_ID != GFC_ISYM_LBOUND
3088 && GENERIC_ID != GFC_ISYM_LEN
3089 && GENERIC_ID != GFC_ISYM_LOC
3090 && GENERIC_ID != GFC_ISYM_PRESENT)
3092 /* Array intrinsics must also have the last upper bound of an
3093 assumed size array argument. UBOUND and SIZE have to be
3094 excluded from the check if the second argument is anything
3097 for (arg = expr->value.function.actual; arg; arg = arg->next)
3099 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
3100 && arg->next != NULL && arg->next->expr)
3102 if (arg->next->expr->expr_type != EXPR_CONSTANT)
3105 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
3108 if ((int)mpz_get_si (arg->next->expr->value.integer)
3113 if (arg->expr != NULL
3114 && arg->expr->rank > 0
3115 && resolve_assumed_size_actual (arg->expr))
3121 need_full_assumed_size = temp;
3124 if (!pure_function (expr, &name) && name)
3128 gfc_error ("reference to non-PURE function '%s' at %L inside a "
3129 "FORALL %s", name, &expr->where,
3130 forall_flag == 2 ? "mask" : "block");
3133 else if (gfc_pure (NULL))
3135 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
3136 "procedure within a PURE procedure", name, &expr->where);
3141 if (!pure_function (expr, &name) && name && gfc_implicit_pure (NULL))
3142 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3144 /* Functions without the RECURSIVE attribution are not allowed to
3145 * call themselves. */
3146 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
3149 esym = expr->value.function.esym;
3151 if (is_illegal_recursion (esym, gfc_current_ns))
3153 if (esym->attr.entry && esym->ns->entries)
3154 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3155 " function '%s' is not RECURSIVE",
3156 esym->name, &expr->where, esym->ns->entries->sym->name);
3158 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
3159 " is not RECURSIVE", esym->name, &expr->where);
3165 /* Character lengths of use associated functions may contains references to
3166 symbols not referenced from the current program unit otherwise. Make sure
3167 those symbols are marked as referenced. */
3169 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
3170 && expr->value.function.esym->attr.use_assoc)
3172 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
3175 /* Make sure that the expression has a typespec that works. */
3176 if (expr->ts.type == BT_UNKNOWN)
3178 if (expr->symtree->n.sym->result
3179 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
3180 && !expr->symtree->n.sym->result->attr.proc_pointer)
3181 expr->ts = expr->symtree->n.sym->result->ts;
3188 /************* Subroutine resolution *************/
3191 pure_subroutine (gfc_code *c, gfc_symbol *sym)
3197 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
3198 sym->name, &c->loc);
3199 else if (gfc_pure (NULL))
3200 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
3206 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
3210 if (sym->attr.generic)
3212 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
3215 c->resolved_sym = s;
3216 pure_subroutine (c, s);
3220 /* TODO: Need to search for elemental references in generic interface. */
3223 if (sym->attr.intrinsic)
3224 return gfc_intrinsic_sub_interface (c, 0);
3231 resolve_generic_s (gfc_code *c)
3236 sym = c->symtree->n.sym;
3240 m = resolve_generic_s0 (c, sym);
3243 else if (m == MATCH_ERROR)
3247 if (sym->ns->parent == NULL)
3249 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3253 if (!generic_sym (sym))
3257 /* Last ditch attempt. See if the reference is to an intrinsic
3258 that possesses a matching interface. 14.1.2.4 */
3259 sym = c->symtree->n.sym;
3261 if (!gfc_is_intrinsic (sym, 1, c->loc))
3263 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3264 sym->name, &c->loc);
3268 m = gfc_intrinsic_sub_interface (c, 0);
3272 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3273 "intrinsic subroutine interface", sym->name, &c->loc);
3279 /* Set the name and binding label of the subroutine symbol in the call
3280 expression represented by 'c' to include the type and kind of the
3281 second parameter. This function is for resolving the appropriate
3282 version of c_f_pointer() and c_f_procpointer(). For example, a
3283 call to c_f_pointer() for a default integer pointer could have a
3284 name of c_f_pointer_i4. If no second arg exists, which is an error
3285 for these two functions, it defaults to the generic symbol's name
3286 and binding label. */
3289 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3290 char *name, char *binding_label)
3292 gfc_expr *arg = NULL;
3296 /* The second arg of c_f_pointer and c_f_procpointer determines
3297 the type and kind for the procedure name. */
3298 arg = c->ext.actual->next->expr;
3302 /* Set up the name to have the given symbol's name,
3303 plus the type and kind. */
3304 /* a derived type is marked with the type letter 'u' */
3305 if (arg->ts.type == BT_DERIVED)
3308 kind = 0; /* set the kind as 0 for now */
3312 type = gfc_type_letter (arg->ts.type);
3313 kind = arg->ts.kind;
3316 if (arg->ts.type == BT_CHARACTER)
3317 /* Kind info for character strings not needed. */
3320 sprintf (name, "%s_%c%d", sym->name, type, kind);
3321 /* Set up the binding label as the given symbol's label plus
3322 the type and kind. */
3323 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3327 /* If the second arg is missing, set the name and label as
3328 was, cause it should at least be found, and the missing
3329 arg error will be caught by compare_parameters(). */
3330 sprintf (name, "%s", sym->name);
3331 sprintf (binding_label, "%s", sym->binding_label);
3338 /* Resolve a generic version of the iso_c_binding procedure given
3339 (sym) to the specific one based on the type and kind of the
3340 argument(s). Currently, this function resolves c_f_pointer() and
3341 c_f_procpointer based on the type and kind of the second argument
3342 (FPTR). Other iso_c_binding procedures aren't specially handled.
3343 Upon successfully exiting, c->resolved_sym will hold the resolved
3344 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3348 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3350 gfc_symbol *new_sym;
3351 /* this is fine, since we know the names won't use the max */
3352 char name[GFC_MAX_SYMBOL_LEN + 1];
3353 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3354 /* default to success; will override if find error */
3355 match m = MATCH_YES;
3357 /* Make sure the actual arguments are in the necessary order (based on the
3358 formal args) before resolving. */
3359 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3361 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3362 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3364 set_name_and_label (c, sym, name, binding_label);
3366 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3368 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3370 /* Make sure we got a third arg if the second arg has non-zero
3371 rank. We must also check that the type and rank are
3372 correct since we short-circuit this check in
3373 gfc_procedure_use() (called above to sort actual args). */
3374 if (c->ext.actual->next->expr->rank != 0)
3376 if(c->ext.actual->next->next == NULL
3377 || c->ext.actual->next->next->expr == NULL)
3380 gfc_error ("Missing SHAPE parameter for call to %s "
3381 "at %L", sym->name, &(c->loc));
3383 else if (c->ext.actual->next->next->expr->ts.type
3385 || c->ext.actual->next->next->expr->rank != 1)
3388 gfc_error ("SHAPE parameter for call to %s at %L must "
3389 "be a rank 1 INTEGER array", sym->name,
3396 if (m != MATCH_ERROR)
3398 /* the 1 means to add the optional arg to formal list */
3399 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3401 /* for error reporting, say it's declared where the original was */
3402 new_sym->declared_at = sym->declared_at;
3407 /* no differences for c_loc or c_funloc */
3411 /* set the resolved symbol */
3412 if (m != MATCH_ERROR)
3413 c->resolved_sym = new_sym;
3415 c->resolved_sym = sym;
3421 /* Resolve a subroutine call known to be specific. */
3424 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3428 if(sym->attr.is_iso_c)
3430 m = gfc_iso_c_sub_interface (c,sym);
3434 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3436 if (sym->attr.dummy)
3438 sym->attr.proc = PROC_DUMMY;
3442 sym->attr.proc = PROC_EXTERNAL;
3446 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3449 if (sym->attr.intrinsic)
3451 m = gfc_intrinsic_sub_interface (c, 1);
3455 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3456 "with an intrinsic", sym->name, &c->loc);
3464 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3466 c->resolved_sym = sym;
3467 pure_subroutine (c, sym);
3474 resolve_specific_s (gfc_code *c)
3479 sym = c->symtree->n.sym;
3483 m = resolve_specific_s0 (c, sym);
3486 if (m == MATCH_ERROR)
3489 if (sym->ns->parent == NULL)
3492 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3498 sym = c->symtree->n.sym;
3499 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3500 sym->name, &c->loc);
3506 /* Resolve a subroutine call not known to be generic nor specific. */
3509 resolve_unknown_s (gfc_code *c)
3513 sym = c->symtree->n.sym;
3515 if (sym->attr.dummy)
3517 sym->attr.proc = PROC_DUMMY;
3521 /* See if we have an intrinsic function reference. */
3523 if (gfc_is_intrinsic (sym, 1, c->loc))
3525 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3530 /* The reference is to an external name. */
3533 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3535 c->resolved_sym = sym;
3537 pure_subroutine (c, sym);
3543 /* Resolve a subroutine call. Although it was tempting to use the same code
3544 for functions, subroutines and functions are stored differently and this
3545 makes things awkward. */
3548 resolve_call (gfc_code *c)
3551 procedure_type ptype = PROC_INTRINSIC;
3552 gfc_symbol *csym, *sym;
3553 bool no_formal_args;
3555 csym = c->symtree ? c->symtree->n.sym : NULL;
3557 if (csym && csym->ts.type != BT_UNKNOWN)
3559 gfc_error ("'%s' at %L has a type, which is not consistent with "
3560 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3564 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3567 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3568 sym = st ? st->n.sym : NULL;
3569 if (sym && csym != sym
3570 && sym->ns == gfc_current_ns
3571 && sym->attr.flavor == FL_PROCEDURE
3572 && sym->attr.contained)
3575 if (csym->attr.generic)
3576 c->symtree->n.sym = sym;
3579 csym = c->symtree->n.sym;
3583 /* If this ia a deferred TBP with an abstract interface
3584 (which may of course be referenced), c->expr1 will be set. */
3585 if (csym && csym->attr.abstract && !c->expr1)
3587 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3588 csym->name, &c->loc);
3592 /* Subroutines without the RECURSIVE attribution are not allowed to
3593 * call themselves. */
3594 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3596 if (csym->attr.entry && csym->ns->entries)
3597 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3598 " subroutine '%s' is not RECURSIVE",
3599 csym->name, &c->loc, csym->ns->entries->sym->name);
3601 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3602 " is not RECURSIVE", csym->name, &c->loc);
3607 /* Switch off assumed size checking and do this again for certain kinds
3608 of procedure, once the procedure itself is resolved. */
3609 need_full_assumed_size++;
3612 ptype = csym->attr.proc;
3614 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3615 if (resolve_actual_arglist (c->ext.actual, ptype,
3616 no_formal_args) == FAILURE)
3619 /* Resume assumed_size checking. */
3620 need_full_assumed_size--;
3622 /* If external, check for usage. */
3623 if (csym && is_external_proc (csym))
3624 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3627 if (c->resolved_sym == NULL)
3629 c->resolved_isym = NULL;
3630 switch (procedure_kind (csym))
3633 t = resolve_generic_s (c);
3636 case PTYPE_SPECIFIC:
3637 t = resolve_specific_s (c);
3641 t = resolve_unknown_s (c);
3645 gfc_internal_error ("resolve_subroutine(): bad function type");
3649 /* Some checks of elemental subroutine actual arguments. */
3650 if (resolve_elemental_actual (NULL, c) == FAILURE)
3657 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3658 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3659 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3660 if their shapes do not match. If either op1->shape or op2->shape is
3661 NULL, return SUCCESS. */
3664 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3671 if (op1->shape != NULL && op2->shape != NULL)
3673 for (i = 0; i < op1->rank; i++)
3675 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3677 gfc_error ("Shapes for operands at %L and %L are not conformable",
3678 &op1->where, &op2->where);
3689 /* Resolve an operator expression node. This can involve replacing the
3690 operation with a user defined function call. */
3693 resolve_operator (gfc_expr *e)
3695 gfc_expr *op1, *op2;
3697 bool dual_locus_error;
3700 /* Resolve all subnodes-- give them types. */
3702 switch (e->value.op.op)
3705 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3708 /* Fall through... */
3711 case INTRINSIC_UPLUS:
3712 case INTRINSIC_UMINUS:
3713 case INTRINSIC_PARENTHESES:
3714 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3719 /* Typecheck the new node. */
3721 op1 = e->value.op.op1;
3722 op2 = e->value.op.op2;
3723 dual_locus_error = false;
3725 if ((op1 && op1->expr_type == EXPR_NULL)
3726 || (op2 && op2->expr_type == EXPR_NULL))
3728 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3732 switch (e->value.op.op)
3734 case INTRINSIC_UPLUS:
3735 case INTRINSIC_UMINUS:
3736 if (op1->ts.type == BT_INTEGER
3737 || op1->ts.type == BT_REAL
3738 || op1->ts.type == BT_COMPLEX)
3744 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3745 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3748 case INTRINSIC_PLUS:
3749 case INTRINSIC_MINUS:
3750 case INTRINSIC_TIMES:
3751 case INTRINSIC_DIVIDE:
3752 case INTRINSIC_POWER:
3753 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3755 gfc_type_convert_binary (e, 1);
3760 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3761 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3762 gfc_typename (&op2->ts));
3765 case INTRINSIC_CONCAT:
3766 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3767 && op1->ts.kind == op2->ts.kind)
3769 e->ts.type = BT_CHARACTER;
3770 e->ts.kind = op1->ts.kind;
3775 _("Operands of string concatenation operator at %%L are %s/%s"),
3776 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3782 case INTRINSIC_NEQV:
3783 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3785 e->ts.type = BT_LOGICAL;
3786 e->ts.kind = gfc_kind_max (op1, op2);
3787 if (op1->ts.kind < e->ts.kind)
3788 gfc_convert_type (op1, &e->ts, 2);
3789 else if (op2->ts.kind < e->ts.kind)
3790 gfc_convert_type (op2, &e->ts, 2);
3794 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3795 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3796 gfc_typename (&op2->ts));
3801 if (op1->ts.type == BT_LOGICAL)
3803 e->ts.type = BT_LOGICAL;
3804 e->ts.kind = op1->ts.kind;
3808 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3809 gfc_typename (&op1->ts));
3813 case INTRINSIC_GT_OS:
3815 case INTRINSIC_GE_OS:
3817 case INTRINSIC_LT_OS:
3819 case INTRINSIC_LE_OS:
3820 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3822 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3826 /* Fall through... */
3829 case INTRINSIC_EQ_OS:
3831 case INTRINSIC_NE_OS:
3832 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3833 && op1->ts.kind == op2->ts.kind)
3835 e->ts.type = BT_LOGICAL;
3836 e->ts.kind = gfc_default_logical_kind;
3840 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3842 gfc_type_convert_binary (e, 1);
3844 e->ts.type = BT_LOGICAL;
3845 e->ts.kind = gfc_default_logical_kind;
3849 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3851 _("Logicals at %%L must be compared with %s instead of %s"),
3852 (e->value.op.op == INTRINSIC_EQ
3853 || e->value.op.op == INTRINSIC_EQ_OS)
3854 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3857 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3858 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3859 gfc_typename (&op2->ts));
3863 case INTRINSIC_USER:
3864 if (e->value.op.uop->op == NULL)
3865 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3866 else if (op2 == NULL)
3867 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3868 e->value.op.uop->name, gfc_typename (&op1->ts));
3871 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3872 e->value.op.uop->name, gfc_typename (&op1->ts),
3873 gfc_typename (&op2->ts));
3874 e->value.op.uop->op->sym->attr.referenced = 1;
3879 case INTRINSIC_PARENTHESES:
3881 if (e->ts.type == BT_CHARACTER)
3882 e->ts.u.cl = op1->ts.u.cl;
3886 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3889 /* Deal with arrayness of an operand through an operator. */
3893 switch (e->value.op.op)
3895 case INTRINSIC_PLUS:
3896 case INTRINSIC_MINUS:
3897 case INTRINSIC_TIMES:
3898 case INTRINSIC_DIVIDE:
3899 case INTRINSIC_POWER:
3900 case INTRINSIC_CONCAT:
3904 case INTRINSIC_NEQV:
3906 case INTRINSIC_EQ_OS:
3908 case INTRINSIC_NE_OS:
3910 case INTRINSIC_GT_OS:
3912 case INTRINSIC_GE_OS:
3914 case INTRINSIC_LT_OS:
3916 case INTRINSIC_LE_OS:
3918 if (op1->rank == 0 && op2->rank == 0)
3921 if (op1->rank == 0 && op2->rank != 0)
3923 e->rank = op2->rank;
3925 if (e->shape == NULL)
3926 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3929 if (op1->rank != 0 && op2->rank == 0)
3931 e->rank = op1->rank;
3933 if (e->shape == NULL)
3934 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3937 if (op1->rank != 0 && op2->rank != 0)
3939 if (op1->rank == op2->rank)
3941 e->rank = op1->rank;
3942 if (e->shape == NULL)
3944 t = compare_shapes (op1, op2);
3948 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3953 /* Allow higher level expressions to work. */
3956 /* Try user-defined operators, and otherwise throw an error. */
3957 dual_locus_error = true;
3959 _("Inconsistent ranks for operator at %%L and %%L"));
3966 case INTRINSIC_PARENTHESES:
3968 case INTRINSIC_UPLUS:
3969 case INTRINSIC_UMINUS:
3970 /* Simply copy arrayness attribute */
3971 e->rank = op1->rank;
3973 if (e->shape == NULL)
3974 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3982 /* Attempt to simplify the expression. */
3985 t = gfc_simplify_expr (e, 0);
3986 /* Some calls do not succeed in simplification and return FAILURE
3987 even though there is no error; e.g. variable references to
3988 PARAMETER arrays. */
3989 if (!gfc_is_constant_expr (e))
3998 if (gfc_extend_expr (e, &real_error) == SUCCESS)
4005 if (dual_locus_error)
4006 gfc_error (msg, &op1->where, &op2->where);
4008 gfc_error (msg, &e->where);
4014 /************** Array resolution subroutines **************/
4017 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
4020 /* Compare two integer expressions. */
4023 compare_bound (gfc_expr *a, gfc_expr *b)
4027 if (a == NULL || a->expr_type != EXPR_CONSTANT
4028 || b == NULL || b->expr_type != EXPR_CONSTANT)
4031 /* If either of the types isn't INTEGER, we must have
4032 raised an error earlier. */
4034 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
4037 i = mpz_cmp (a->value.integer, b->value.integer);
4047 /* Compare an integer expression with an integer. */
4050 compare_bound_int (gfc_expr *a, int b)
4054 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4057 if (a->ts.type != BT_INTEGER)
4058 gfc_internal_error ("compare_bound_int(): Bad expression");
4060 i = mpz_cmp_si (a->value.integer, b);
4070 /* Compare an integer expression with a mpz_t. */
4073 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
4077 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4080 if (a->ts.type != BT_INTEGER)
4081 gfc_internal_error ("compare_bound_int(): Bad expression");
4083 i = mpz_cmp (a->value.integer, b);
4093 /* Compute the last value of a sequence given by a triplet.
4094 Return 0 if it wasn't able to compute the last value, or if the
4095 sequence if empty, and 1 otherwise. */
4098 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
4099 gfc_expr *stride, mpz_t last)
4103 if (start == NULL || start->expr_type != EXPR_CONSTANT
4104 || end == NULL || end->expr_type != EXPR_CONSTANT
4105 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
4108 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
4109 || (stride != NULL && stride->ts.type != BT_INTEGER))
4112 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
4114 if (compare_bound (start, end) == CMP_GT)
4116 mpz_set (last, end->value.integer);
4120 if (compare_bound_int (stride, 0) == CMP_GT)
4122 /* Stride is positive */
4123 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
4128 /* Stride is negative */
4129 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
4134 mpz_sub (rem, end->value.integer, start->value.integer);
4135 mpz_tdiv_r (rem, rem, stride->value.integer);
4136 mpz_sub (last, end->value.integer, rem);
4143 /* Compare a single dimension of an array reference to the array
4147 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
4151 if (ar->dimen_type[i] == DIMEN_STAR)
4153 gcc_assert (ar->stride[i] == NULL);
4154 /* This implies [*] as [*:] and [*:3] are not possible. */
4155 if (ar->start[i] == NULL)
4157 gcc_assert (ar->end[i] == NULL);
4162 /* Given start, end and stride values, calculate the minimum and
4163 maximum referenced indexes. */
4165 switch (ar->dimen_type[i])
4168 case DIMEN_THIS_IMAGE:
4173 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
4176 gfc_warning ("Array reference at %L is out of bounds "
4177 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4178 mpz_get_si (ar->start[i]->value.integer),
4179 mpz_get_si (as->lower[i]->value.integer), i+1);
4181 gfc_warning ("Array reference at %L is out of bounds "
4182 "(%ld < %ld) in codimension %d", &ar->c_where[i],
4183 mpz_get_si (ar->start[i]->value.integer),
4184 mpz_get_si (as->lower[i]->value.integer),
4188 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
4191 gfc_warning ("Array reference at %L is out of bounds "
4192 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4193 mpz_get_si (ar->start[i]->value.integer),
4194 mpz_get_si (as->upper[i]->value.integer), i+1);
4196 gfc_warning ("Array reference at %L is out of bounds "
4197 "(%ld > %ld) in codimension %d", &ar->c_where[i],
4198 mpz_get_si (ar->start[i]->value.integer),
4199 mpz_get_si (as->upper[i]->value.integer),
4208 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
4209 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
4211 comparison comp_start_end = compare_bound (AR_START, AR_END);
4213 /* Check for zero stride, which is not allowed. */
4214 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
4216 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
4220 /* if start == len || (stride > 0 && start < len)
4221 || (stride < 0 && start > len),
4222 then the array section contains at least one element. In this
4223 case, there is an out-of-bounds access if
4224 (start < lower || start > upper). */
4225 if (compare_bound (AR_START, AR_END) == CMP_EQ
4226 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
4227 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
4228 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
4229 && comp_start_end == CMP_GT))
4231 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
4233 gfc_warning ("Lower array reference at %L is out of bounds "
4234 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4235 mpz_get_si (AR_START->value.integer),
4236 mpz_get_si (as->lower[i]->value.integer), i+1);
4239 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4241 gfc_warning ("Lower array reference at %L is out of bounds "
4242 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4243 mpz_get_si (AR_START->value.integer),
4244 mpz_get_si (as->upper[i]->value.integer), i+1);
4249 /* If we can compute the highest index of the array section,
4250 then it also has to be between lower and upper. */
4251 mpz_init (last_value);
4252 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4255 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4257 gfc_warning ("Upper array reference at %L is out of bounds "
4258 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4259 mpz_get_si (last_value),
4260 mpz_get_si (as->lower[i]->value.integer), i+1);
4261 mpz_clear (last_value);
4264 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4266 gfc_warning ("Upper array reference at %L is out of bounds "
4267 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4268 mpz_get_si (last_value),
4269 mpz_get_si (as->upper[i]->value.integer), i+1);
4270 mpz_clear (last_value);
4274 mpz_clear (last_value);
4282 gfc_internal_error ("check_dimension(): Bad array reference");
4289 /* Compare an array reference with an array specification. */
4292 compare_spec_to_ref (gfc_array_ref *ar)
4299 /* TODO: Full array sections are only allowed as actual parameters. */
4300 if (as->type == AS_ASSUMED_SIZE
4301 && (/*ar->type == AR_FULL
4302 ||*/ (ar->type == AR_SECTION
4303 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4305 gfc_error ("Rightmost upper bound of assumed size array section "
4306 "not specified at %L", &ar->where);
4310 if (ar->type == AR_FULL)
4313 if (as->rank != ar->dimen)
4315 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4316 &ar->where, ar->dimen, as->rank);
4320 /* ar->codimen == 0 is a local array. */
4321 if (as->corank != ar->codimen && ar->codimen != 0)
4323 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4324 &ar->where, ar->codimen, as->corank);
4328 for (i = 0; i < as->rank; i++)
4329 if (check_dimension (i, ar, as) == FAILURE)
4332 /* Local access has no coarray spec. */
4333 if (ar->codimen != 0)
4334 for (i = as->rank; i < as->rank + as->corank; i++)
4336 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate
4337 && ar->dimen_type[i] != DIMEN_THIS_IMAGE)
4339 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4340 i + 1 - as->rank, &ar->where);
4343 if (check_dimension (i, ar, as) == FAILURE)
4347 if (as->corank && ar->codimen == 0)
4350 ar->codimen = as->corank;
4351 for (n = ar->dimen; n < ar->dimen + ar->codimen; n++)
4352 ar->dimen_type[n] = DIMEN_THIS_IMAGE;
4359 /* Resolve one part of an array index. */
4362 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4363 int force_index_integer_kind)
4370 if (gfc_resolve_expr (index) == FAILURE)
4373 if (check_scalar && index->rank != 0)
4375 gfc_error ("Array index at %L must be scalar", &index->where);
4379 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4381 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4382 &index->where, gfc_basic_typename (index->ts.type));
4386 if (index->ts.type == BT_REAL)
4387 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4388 &index->where) == FAILURE)
4391 if ((index->ts.kind != gfc_index_integer_kind
4392 && force_index_integer_kind)
4393 || index->ts.type != BT_INTEGER)
4396 ts.type = BT_INTEGER;
4397 ts.kind = gfc_index_integer_kind;
4399 gfc_convert_type_warn (index, &ts, 2, 0);
4405 /* Resolve one part of an array index. */
4408 gfc_resolve_index (gfc_expr *index, int check_scalar)
4410 return gfc_resolve_index_1 (index, check_scalar, 1);
4413 /* Resolve a dim argument to an intrinsic function. */
4416 gfc_resolve_dim_arg (gfc_expr *dim)
4421 if (gfc_resolve_expr (dim) == FAILURE)
4426 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4431 if (dim->ts.type != BT_INTEGER)
4433 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4437 if (dim->ts.kind != gfc_index_integer_kind)
4442 ts.type = BT_INTEGER;
4443 ts.kind = gfc_index_integer_kind;
4445 gfc_convert_type_warn (dim, &ts, 2, 0);
4451 /* Given an expression that contains array references, update those array
4452 references to point to the right array specifications. While this is
4453 filled in during matching, this information is difficult to save and load
4454 in a module, so we take care of it here.
4456 The idea here is that the original array reference comes from the
4457 base symbol. We traverse the list of reference structures, setting
4458 the stored reference to references. Component references can
4459 provide an additional array specification. */
4462 find_array_spec (gfc_expr *e)
4466 gfc_symbol *derived;
4469 if (e->symtree->n.sym->ts.type == BT_CLASS)
4470 as = CLASS_DATA (e->symtree->n.sym)->as;
4472 as = e->symtree->n.sym->as;
4475 for (ref = e->ref; ref; ref = ref->next)
4480 gfc_internal_error ("find_array_spec(): Missing spec");
4487 if (derived == NULL)
4488 derived = e->symtree->n.sym->ts.u.derived;
4490 if (derived->attr.is_class)
4491 derived = derived->components->ts.u.derived;
4493 c = derived->components;
4495 for (; c; c = c->next)
4496 if (c == ref->u.c.component)
4498 /* Track the sequence of component references. */
4499 if (c->ts.type == BT_DERIVED)
4500 derived = c->ts.u.derived;
4505 gfc_internal_error ("find_array_spec(): Component not found");
4507 if (c->attr.dimension)
4510 gfc_internal_error ("find_array_spec(): unused as(1)");
4521 gfc_internal_error ("find_array_spec(): unused as(2)");
4525 /* Resolve an array reference. */
4528 resolve_array_ref (gfc_array_ref *ar)
4530 int i, check_scalar;
4533 for (i = 0; i < ar->dimen + ar->codimen; i++)
4535 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4537 /* Do not force gfc_index_integer_kind for the start. We can
4538 do fine with any integer kind. This avoids temporary arrays
4539 created for indexing with a vector. */
4540 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4542 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4544 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4549 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4553 ar->dimen_type[i] = DIMEN_ELEMENT;
4557 ar->dimen_type[i] = DIMEN_VECTOR;
4558 if (e->expr_type == EXPR_VARIABLE
4559 && e->symtree->n.sym->ts.type == BT_DERIVED)
4560 ar->start[i] = gfc_get_parentheses (e);
4564 gfc_error ("Array index at %L is an array of rank %d",
4565 &ar->c_where[i], e->rank);
4569 /* Fill in the upper bound, which may be lower than the
4570 specified one for something like a(2:10:5), which is
4571 identical to a(2:7:5). Only relevant for strides not equal
4573 if (ar->dimen_type[i] == DIMEN_RANGE
4574 && ar->stride[i] != NULL && ar->stride[i]->expr_type == EXPR_CONSTANT
4575 && mpz_cmp_si (ar->stride[i]->value.integer, 1L) != 0)
4579 if (gfc_ref_dimen_size (ar, i, &size, &end) == SUCCESS)
4581 if (ar->end[i] == NULL)
4584 gfc_get_constant_expr (BT_INTEGER, gfc_index_integer_kind,
4586 mpz_set (ar->end[i]->value.integer, end);
4588 else if (ar->end[i]->ts.type == BT_INTEGER
4589 && ar->end[i]->expr_type == EXPR_CONSTANT)
4591 mpz_set (ar->end[i]->value.integer, end);
4602 if (ar->type == AR_FULL && ar->as->rank == 0)
4603 ar->type = AR_ELEMENT;
4605 /* If the reference type is unknown, figure out what kind it is. */
4607 if (ar->type == AR_UNKNOWN)
4609 ar->type = AR_ELEMENT;
4610 for (i = 0; i < ar->dimen; i++)
4611 if (ar->dimen_type[i] == DIMEN_RANGE
4612 || ar->dimen_type[i] == DIMEN_VECTOR)
4614 ar->type = AR_SECTION;
4619 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4627 resolve_substring (gfc_ref *ref)
4629 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4631 if (ref->u.ss.start != NULL)
4633 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4636 if (ref->u.ss.start->ts.type != BT_INTEGER)
4638 gfc_error ("Substring start index at %L must be of type INTEGER",
4639 &ref->u.ss.start->where);
4643 if (ref->u.ss.start->rank != 0)
4645 gfc_error ("Substring start index at %L must be scalar",
4646 &ref->u.ss.start->where);
4650 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4651 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4652 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4654 gfc_error ("Substring start index at %L is less than one",
4655 &ref->u.ss.start->where);
4660 if (ref->u.ss.end != NULL)
4662 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4665 if (ref->u.ss.end->ts.type != BT_INTEGER)
4667 gfc_error ("Substring end index at %L must be of type INTEGER",
4668 &ref->u.ss.end->where);
4672 if (ref->u.ss.end->rank != 0)
4674 gfc_error ("Substring end index at %L must be scalar",
4675 &ref->u.ss.end->where);
4679 if (ref->u.ss.length != NULL
4680 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4681 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4682 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4684 gfc_error ("Substring end index at %L exceeds the string length",
4685 &ref->u.ss.start->where);
4689 if (compare_bound_mpz_t (ref->u.ss.end,
4690 gfc_integer_kinds[k].huge) == CMP_GT
4691 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4692 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4694 gfc_error ("Substring end index at %L is too large",
4695 &ref->u.ss.end->where);
4704 /* This function supplies missing substring charlens. */
4707 gfc_resolve_substring_charlen (gfc_expr *e)
4710 gfc_expr *start, *end;
4712 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4713 if (char_ref->type == REF_SUBSTRING)
4719 gcc_assert (char_ref->next == NULL);
4723 if (e->ts.u.cl->length)
4724 gfc_free_expr (e->ts.u.cl->length);
4725 else if (e->expr_type == EXPR_VARIABLE
4726 && e->symtree->n.sym->attr.dummy)
4730 e->ts.type = BT_CHARACTER;
4731 e->ts.kind = gfc_default_character_kind;
4734 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4736 if (char_ref->u.ss.start)
4737 start = gfc_copy_expr (char_ref->u.ss.start);
4739 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4741 if (char_ref->u.ss.end)
4742 end = gfc_copy_expr (char_ref->u.ss.end);
4743 else if (e->expr_type == EXPR_VARIABLE)
4744 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4751 /* Length = (end - start +1). */
4752 e->ts.u.cl->length = gfc_subtract (end, start);
4753 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4754 gfc_get_int_expr (gfc_default_integer_kind,
4757 e->ts.u.cl->length->ts.type = BT_INTEGER;
4758 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4760 /* Make sure that the length is simplified. */
4761 gfc_simplify_expr (e->ts.u.cl->length, 1);
4762 gfc_resolve_expr (e->ts.u.cl->length);
4766 /* Resolve subtype references. */
4769 resolve_ref (gfc_expr *expr)
4771 int current_part_dimension, n_components, seen_part_dimension;
4774 for (ref = expr->ref; ref; ref = ref->next)
4775 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4777 find_array_spec (expr);
4781 for (ref = expr->ref; ref; ref = ref->next)
4785 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4793 resolve_substring (ref);
4797 /* Check constraints on part references. */
4799 current_part_dimension = 0;
4800 seen_part_dimension = 0;
4803 for (ref = expr->ref; ref; ref = ref->next)
4808 switch (ref->u.ar.type)
4811 /* Coarray scalar. */
4812 if (ref->u.ar.as->rank == 0)
4814 current_part_dimension = 0;
4819 current_part_dimension = 1;
4823 current_part_dimension = 0;
4827 gfc_internal_error ("resolve_ref(): Bad array reference");
4833 if (current_part_dimension || seen_part_dimension)
4836 if (ref->u.c.component->attr.pointer
4837 || ref->u.c.component->attr.proc_pointer)
4839 gfc_error ("Component to the right of a part reference "
4840 "with nonzero rank must not have the POINTER "
4841 "attribute at %L", &expr->where);
4844 else if (ref->u.c.component->attr.allocatable)
4846 gfc_error ("Component to the right of a part reference "
4847 "with nonzero rank must not have the ALLOCATABLE "
4848 "attribute at %L", &expr->where);
4860 if (((ref->type == REF_COMPONENT && n_components > 1)
4861 || ref->next == NULL)
4862 && current_part_dimension
4863 && seen_part_dimension)
4865 gfc_error ("Two or more part references with nonzero rank must "
4866 "not be specified at %L", &expr->where);
4870 if (ref->type == REF_COMPONENT)
4872 if (current_part_dimension)
4873 seen_part_dimension = 1;
4875 /* reset to make sure */
4876 current_part_dimension = 0;
4884 /* Given an expression, determine its shape. This is easier than it sounds.
4885 Leaves the shape array NULL if it is not possible to determine the shape. */
4888 expression_shape (gfc_expr *e)
4890 mpz_t array[GFC_MAX_DIMENSIONS];
4893 if (e->rank == 0 || e->shape != NULL)
4896 for (i = 0; i < e->rank; i++)
4897 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4900 e->shape = gfc_get_shape (e->rank);
4902 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4907 for (i--; i >= 0; i--)
4908 mpz_clear (array[i]);
4912 /* Given a variable expression node, compute the rank of the expression by
4913 examining the base symbol and any reference structures it may have. */
4916 expression_rank (gfc_expr *e)
4921 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4922 could lead to serious confusion... */
4923 gcc_assert (e->expr_type != EXPR_COMPCALL);
4927 if (e->expr_type == EXPR_ARRAY)
4929 /* Constructors can have a rank different from one via RESHAPE(). */
4931 if (e->symtree == NULL)
4937 e->rank = (e->symtree->n.sym->as == NULL)
4938 ? 0 : e->symtree->n.sym->as->rank;
4944 for (ref = e->ref; ref; ref = ref->next)
4946 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.proc_pointer
4947 && ref->u.c.component->attr.function && !ref->next)
4948 rank = ref->u.c.component->as ? ref->u.c.component->as->rank : 0;
4950 if (ref->type != REF_ARRAY)
4953 if (ref->u.ar.type == AR_FULL)
4955 rank = ref->u.ar.as->rank;
4959 if (ref->u.ar.type == AR_SECTION)
4961 /* Figure out the rank of the section. */
4963 gfc_internal_error ("expression_rank(): Two array specs");
4965 for (i = 0; i < ref->u.ar.dimen; i++)
4966 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4967 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4977 expression_shape (e);
4981 /* Resolve a variable expression. */
4984 resolve_variable (gfc_expr *e)
4991 if (e->symtree == NULL)
4993 sym = e->symtree->n.sym;
4995 /* If this is an associate-name, it may be parsed with an array reference
4996 in error even though the target is scalar. Fail directly in this case. */
4997 if (sym->assoc && !sym->attr.dimension && e->ref && e->ref->type == REF_ARRAY)
5000 /* On the other hand, the parser may not have known this is an array;
5001 in this case, we have to add a FULL reference. */
5002 if (sym->assoc && sym->attr.dimension && !e->ref)
5004 e->ref = gfc_get_ref ();
5005 e->ref->type = REF_ARRAY;
5006 e->ref->u.ar.type = AR_FULL;
5007 e->ref->u.ar.dimen = 0;
5010 if (e->ref && resolve_ref (e) == FAILURE)
5013 if (sym->attr.flavor == FL_PROCEDURE
5014 && (!sym->attr.function
5015 || (sym->attr.function && sym->result
5016 && sym->result->attr.proc_pointer
5017 && !sym->result->attr.function)))
5019 e->ts.type = BT_PROCEDURE;
5020 goto resolve_procedure;
5023 if (sym->ts.type != BT_UNKNOWN)
5024 gfc_variable_attr (e, &e->ts);
5027 /* Must be a simple variable reference. */
5028 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
5033 if (check_assumed_size_reference (sym, e))
5036 /* Deal with forward references to entries during resolve_code, to
5037 satisfy, at least partially, 12.5.2.5. */
5038 if (gfc_current_ns->entries
5039 && current_entry_id == sym->entry_id
5042 && cs_base->current->op != EXEC_ENTRY)
5044 gfc_entry_list *entry;
5045 gfc_formal_arglist *formal;
5049 /* If the symbol is a dummy... */
5050 if (sym->attr.dummy && sym->ns == gfc_current_ns)
5052 entry = gfc_current_ns->entries;
5055 /* ...test if the symbol is a parameter of previous entries. */
5056 for (; entry && entry->id <= current_entry_id; entry = entry->next)
5057 for (formal = entry->sym->formal; formal; formal = formal->next)
5059 if (formal->sym && sym->name == formal->sym->name)
5063 /* If it has not been seen as a dummy, this is an error. */
5066 if (specification_expr)
5067 gfc_error ("Variable '%s', used in a specification expression"
5068 ", is referenced at %L before the ENTRY statement "
5069 "in which it is a parameter",
5070 sym->name, &cs_base->current->loc);
5072 gfc_error ("Variable '%s' is used at %L before the ENTRY "
5073 "statement in which it is a parameter",
5074 sym->name, &cs_base->current->loc);
5079 /* Now do the same check on the specification expressions. */
5080 specification_expr = 1;
5081 if (sym->ts.type == BT_CHARACTER
5082 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
5086 for (n = 0; n < sym->as->rank; n++)
5088 specification_expr = 1;
5089 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
5091 specification_expr = 1;
5092 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
5095 specification_expr = 0;
5098 /* Update the symbol's entry level. */
5099 sym->entry_id = current_entry_id + 1;
5102 /* If a symbol has been host_associated mark it. This is used latter,
5103 to identify if aliasing is possible via host association. */
5104 if (sym->attr.flavor == FL_VARIABLE
5105 && gfc_current_ns->parent
5106 && (gfc_current_ns->parent == sym->ns
5107 || (gfc_current_ns->parent->parent
5108 && gfc_current_ns->parent->parent == sym->ns)))
5109 sym->attr.host_assoc = 1;
5112 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
5115 /* F2008, C617 and C1229. */
5116 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
5117 && gfc_is_coindexed (e))
5119 gfc_ref *ref, *ref2 = NULL;
5121 for (ref = e->ref; ref; ref = ref->next)
5123 if (ref->type == REF_COMPONENT)
5125 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
5129 for ( ; ref; ref = ref->next)
5130 if (ref->type == REF_COMPONENT)
5133 /* Expression itself is not coindexed object. */
5134 if (ref && e->ts.type == BT_CLASS)
5136 gfc_error ("Polymorphic subobject of coindexed object at %L",
5141 /* Expression itself is coindexed object. */
5145 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
5146 for ( ; c; c = c->next)
5147 if (c->attr.allocatable && c->ts.type == BT_CLASS)
5149 gfc_error ("Coindexed object with polymorphic allocatable "
5150 "subcomponent at %L", &e->where);
5161 /* Checks to see that the correct symbol has been host associated.
5162 The only situation where this arises is that in which a twice
5163 contained function is parsed after the host association is made.
5164 Therefore, on detecting this, change the symbol in the expression
5165 and convert the array reference into an actual arglist if the old
5166 symbol is a variable. */
5168 check_host_association (gfc_expr *e)
5170 gfc_symbol *sym, *old_sym;
5174 gfc_actual_arglist *arg, *tail = NULL;
5175 bool retval = e->expr_type == EXPR_FUNCTION;
5177 /* If the expression is the result of substitution in
5178 interface.c(gfc_extend_expr) because there is no way in
5179 which the host association can be wrong. */
5180 if (e->symtree == NULL
5181 || e->symtree->n.sym == NULL
5182 || e->user_operator)
5185 old_sym = e->symtree->n.sym;
5187 if (gfc_current_ns->parent
5188 && old_sym->ns != gfc_current_ns)
5190 /* Use the 'USE' name so that renamed module symbols are
5191 correctly handled. */
5192 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
5194 if (sym && old_sym != sym
5195 && sym->ts.type == old_sym->ts.type
5196 && sym->attr.flavor == FL_PROCEDURE
5197 && sym->attr.contained)
5199 /* Clear the shape, since it might not be valid. */
5200 if (e->shape != NULL)
5202 for (n = 0; n < e->rank; n++)
5203 mpz_clear (e->shape[n]);
5208 /* Give the expression the right symtree! */
5209 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
5210 gcc_assert (st != NULL);
5212 if (old_sym->attr.flavor == FL_PROCEDURE
5213 || e->expr_type == EXPR_FUNCTION)
5215 /* Original was function so point to the new symbol, since
5216 the actual argument list is already attached to the
5218 e->value.function.esym = NULL;
5223 /* Original was variable so convert array references into
5224 an actual arglist. This does not need any checking now
5225 since resolve_function will take care of it. */
5226 e->value.function.actual = NULL;
5227 e->expr_type = EXPR_FUNCTION;
5230 /* Ambiguity will not arise if the array reference is not
5231 the last reference. */
5232 for (ref = e->ref; ref; ref = ref->next)
5233 if (ref->type == REF_ARRAY && ref->next == NULL)
5236 gcc_assert (ref->type == REF_ARRAY);
5238 /* Grab the start expressions from the array ref and
5239 copy them into actual arguments. */
5240 for (n = 0; n < ref->u.ar.dimen; n++)
5242 arg = gfc_get_actual_arglist ();
5243 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
5244 if (e->value.function.actual == NULL)
5245 tail = e->value.function.actual = arg;
5253 /* Dump the reference list and set the rank. */
5254 gfc_free_ref_list (e->ref);
5256 e->rank = sym->as ? sym->as->rank : 0;
5259 gfc_resolve_expr (e);
5263 /* This might have changed! */
5264 return e->expr_type == EXPR_FUNCTION;
5269 gfc_resolve_character_operator (gfc_expr *e)
5271 gfc_expr *op1 = e->value.op.op1;
5272 gfc_expr *op2 = e->value.op.op2;
5273 gfc_expr *e1 = NULL;
5274 gfc_expr *e2 = NULL;
5276 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
5278 if (op1->ts.u.cl && op1->ts.u.cl->length)
5279 e1 = gfc_copy_expr (op1->ts.u.cl->length);
5280 else if (op1->expr_type == EXPR_CONSTANT)
5281 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5282 op1->value.character.length);
5284 if (op2->ts.u.cl && op2->ts.u.cl->length)
5285 e2 = gfc_copy_expr (op2->ts.u.cl->length);
5286 else if (op2->expr_type == EXPR_CONSTANT)
5287 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5288 op2->value.character.length);
5290 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5295 e->ts.u.cl->length = gfc_add (e1, e2);
5296 e->ts.u.cl->length->ts.type = BT_INTEGER;
5297 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
5298 gfc_simplify_expr (e->ts.u.cl->length, 0);
5299 gfc_resolve_expr (e->ts.u.cl->length);
5305 /* Ensure that an character expression has a charlen and, if possible, a
5306 length expression. */
5309 fixup_charlen (gfc_expr *e)
5311 /* The cases fall through so that changes in expression type and the need
5312 for multiple fixes are picked up. In all circumstances, a charlen should
5313 be available for the middle end to hang a backend_decl on. */
5314 switch (e->expr_type)
5317 gfc_resolve_character_operator (e);
5320 if (e->expr_type == EXPR_ARRAY)
5321 gfc_resolve_character_array_constructor (e);
5323 case EXPR_SUBSTRING:
5324 if (!e->ts.u.cl && e->ref)
5325 gfc_resolve_substring_charlen (e);
5329 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5336 /* Update an actual argument to include the passed-object for type-bound
5337 procedures at the right position. */
5339 static gfc_actual_arglist*
5340 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5343 gcc_assert (argpos > 0);
5347 gfc_actual_arglist* result;
5349 result = gfc_get_actual_arglist ();
5353 result->name = name;
5359 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5361 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5366 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5369 extract_compcall_passed_object (gfc_expr* e)
5373 gcc_assert (e->expr_type == EXPR_COMPCALL);
5375 if (e->value.compcall.base_object)
5376 po = gfc_copy_expr (e->value.compcall.base_object);
5379 po = gfc_get_expr ();
5380 po->expr_type = EXPR_VARIABLE;
5381 po->symtree = e->symtree;
5382 po->ref = gfc_copy_ref (e->ref);
5383 po->where = e->where;
5386 if (gfc_resolve_expr (po) == FAILURE)
5393 /* Update the arglist of an EXPR_COMPCALL expression to include the
5397 update_compcall_arglist (gfc_expr* e)
5400 gfc_typebound_proc* tbp;
5402 tbp = e->value.compcall.tbp;
5407 po = extract_compcall_passed_object (e);
5411 if (tbp->nopass || e->value.compcall.ignore_pass)
5417 gcc_assert (tbp->pass_arg_num > 0);
5418 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5426 /* Extract the passed object from a PPC call (a copy of it). */
5429 extract_ppc_passed_object (gfc_expr *e)
5434 po = gfc_get_expr ();
5435 po->expr_type = EXPR_VARIABLE;
5436 po->symtree = e->symtree;
5437 po->ref = gfc_copy_ref (e->ref);
5438 po->where = e->where;
5440 /* Remove PPC reference. */
5442 while ((*ref)->next)
5443 ref = &(*ref)->next;
5444 gfc_free_ref_list (*ref);
5447 if (gfc_resolve_expr (po) == FAILURE)
5454 /* Update the actual arglist of a procedure pointer component to include the
5458 update_ppc_arglist (gfc_expr* e)
5462 gfc_typebound_proc* tb;
5464 if (!gfc_is_proc_ptr_comp (e, &ppc))
5471 else if (tb->nopass)
5474 po = extract_ppc_passed_object (e);
5481 gfc_error ("Passed-object at %L must be scalar", &e->where);
5486 if (po->ts.type == BT_DERIVED && po->ts.u.derived->attr.abstract)
5488 gfc_error ("Base object for procedure-pointer component call at %L is of"
5489 " ABSTRACT type '%s'", &e->where, po->ts.u.derived->name);
5493 gcc_assert (tb->pass_arg_num > 0);
5494 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5502 /* Check that the object a TBP is called on is valid, i.e. it must not be
5503 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5506 check_typebound_baseobject (gfc_expr* e)
5509 gfc_try return_value = FAILURE;
5511 base = extract_compcall_passed_object (e);
5515 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5518 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5520 gfc_error ("Base object for type-bound procedure call at %L is of"
5521 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5525 /* F08:C1230. If the procedure called is NOPASS,
5526 the base object must be scalar. */
5527 if (e->value.compcall.tbp->nopass && base->rank > 0)
5529 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5530 " be scalar", &e->where);
5534 /* FIXME: Remove once PR 43214 is fixed (TBP with non-scalar PASS). */
5537 gfc_error ("Non-scalar base object at %L currently not implemented",
5542 return_value = SUCCESS;
5545 gfc_free_expr (base);
5546 return return_value;
5550 /* Resolve a call to a type-bound procedure, either function or subroutine,
5551 statically from the data in an EXPR_COMPCALL expression. The adapted
5552 arglist and the target-procedure symtree are returned. */
5555 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5556 gfc_actual_arglist** actual)
5558 gcc_assert (e->expr_type == EXPR_COMPCALL);
5559 gcc_assert (!e->value.compcall.tbp->is_generic);
5561 /* Update the actual arglist for PASS. */
5562 if (update_compcall_arglist (e) == FAILURE)
5565 *actual = e->value.compcall.actual;
5566 *target = e->value.compcall.tbp->u.specific;
5568 gfc_free_ref_list (e->ref);
5570 e->value.compcall.actual = NULL;
5576 /* Get the ultimate declared type from an expression. In addition,
5577 return the last class/derived type reference and the copy of the
5580 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5583 gfc_symbol *declared;
5590 *new_ref = gfc_copy_ref (e->ref);
5592 for (ref = e->ref; ref; ref = ref->next)
5594 if (ref->type != REF_COMPONENT)
5597 if (ref->u.c.component->ts.type == BT_CLASS
5598 || ref->u.c.component->ts.type == BT_DERIVED)
5600 declared = ref->u.c.component->ts.u.derived;
5606 if (declared == NULL)
5607 declared = e->symtree->n.sym->ts.u.derived;
5613 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5614 which of the specific bindings (if any) matches the arglist and transform
5615 the expression into a call of that binding. */
5618 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5620 gfc_typebound_proc* genproc;
5621 const char* genname;
5623 gfc_symbol *derived;
5625 gcc_assert (e->expr_type == EXPR_COMPCALL);
5626 genname = e->value.compcall.name;
5627 genproc = e->value.compcall.tbp;
5629 if (!genproc->is_generic)
5632 /* Try the bindings on this type and in the inheritance hierarchy. */
5633 for (; genproc; genproc = genproc->overridden)
5637 gcc_assert (genproc->is_generic);
5638 for (g = genproc->u.generic; g; g = g->next)
5641 gfc_actual_arglist* args;
5644 gcc_assert (g->specific);
5646 if (g->specific->error)
5649 target = g->specific->u.specific->n.sym;
5651 /* Get the right arglist by handling PASS/NOPASS. */
5652 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5653 if (!g->specific->nopass)
5656 po = extract_compcall_passed_object (e);
5660 gcc_assert (g->specific->pass_arg_num > 0);
5661 gcc_assert (!g->specific->error);
5662 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5663 g->specific->pass_arg);
5665 resolve_actual_arglist (args, target->attr.proc,
5666 is_external_proc (target) && !target->formal);
5668 /* Check if this arglist matches the formal. */
5669 matches = gfc_arglist_matches_symbol (&args, target);
5671 /* Clean up and break out of the loop if we've found it. */
5672 gfc_free_actual_arglist (args);
5675 e->value.compcall.tbp = g->specific;
5676 genname = g->specific_st->name;
5677 /* Pass along the name for CLASS methods, where the vtab
5678 procedure pointer component has to be referenced. */
5686 /* Nothing matching found! */
5687 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5688 " '%s' at %L", genname, &e->where);
5692 /* Make sure that we have the right specific instance for the name. */
5693 derived = get_declared_from_expr (NULL, NULL, e);
5695 st = gfc_find_typebound_proc (derived, NULL, genname, true, &e->where);
5697 e->value.compcall.tbp = st->n.tb;
5703 /* Resolve a call to a type-bound subroutine. */
5706 resolve_typebound_call (gfc_code* c, const char **name)
5708 gfc_actual_arglist* newactual;
5709 gfc_symtree* target;
5711 /* Check that's really a SUBROUTINE. */
5712 if (!c->expr1->value.compcall.tbp->subroutine)
5714 gfc_error ("'%s' at %L should be a SUBROUTINE",
5715 c->expr1->value.compcall.name, &c->loc);
5719 if (check_typebound_baseobject (c->expr1) == FAILURE)
5722 /* Pass along the name for CLASS methods, where the vtab
5723 procedure pointer component has to be referenced. */
5725 *name = c->expr1->value.compcall.name;
5727 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5730 /* Transform into an ordinary EXEC_CALL for now. */
5732 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5735 c->ext.actual = newactual;
5736 c->symtree = target;
5737 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5739 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5741 gfc_free_expr (c->expr1);
5742 c->expr1 = gfc_get_expr ();
5743 c->expr1->expr_type = EXPR_FUNCTION;
5744 c->expr1->symtree = target;
5745 c->expr1->where = c->loc;
5747 return resolve_call (c);
5751 /* Resolve a component-call expression. */
5753 resolve_compcall (gfc_expr* e, const char **name)
5755 gfc_actual_arglist* newactual;
5756 gfc_symtree* target;
5758 /* Check that's really a FUNCTION. */
5759 if (!e->value.compcall.tbp->function)
5761 gfc_error ("'%s' at %L should be a FUNCTION",
5762 e->value.compcall.name, &e->where);
5766 /* These must not be assign-calls! */
5767 gcc_assert (!e->value.compcall.assign);
5769 if (check_typebound_baseobject (e) == FAILURE)
5772 /* Pass along the name for CLASS methods, where the vtab
5773 procedure pointer component has to be referenced. */
5775 *name = e->value.compcall.name;
5777 if (resolve_typebound_generic_call (e, name) == FAILURE)
5779 gcc_assert (!e->value.compcall.tbp->is_generic);
5781 /* Take the rank from the function's symbol. */
5782 if (e->value.compcall.tbp->u.specific->n.sym->as)
5783 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5785 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5786 arglist to the TBP's binding target. */
5788 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5791 e->value.function.actual = newactual;
5792 e->value.function.name = NULL;
5793 e->value.function.esym = target->n.sym;
5794 e->value.function.isym = NULL;
5795 e->symtree = target;
5796 e->ts = target->n.sym->ts;
5797 e->expr_type = EXPR_FUNCTION;
5799 /* Resolution is not necessary if this is a class subroutine; this
5800 function only has to identify the specific proc. Resolution of
5801 the call will be done next in resolve_typebound_call. */
5802 return gfc_resolve_expr (e);
5807 /* Resolve a typebound function, or 'method'. First separate all
5808 the non-CLASS references by calling resolve_compcall directly. */
5811 resolve_typebound_function (gfc_expr* e)
5813 gfc_symbol *declared;
5824 /* Deal with typebound operators for CLASS objects. */
5825 expr = e->value.compcall.base_object;
5826 if (expr && expr->ts.type == BT_CLASS && e->value.compcall.name)
5828 /* Since the typebound operators are generic, we have to ensure
5829 that any delays in resolution are corrected and that the vtab
5832 declared = ts.u.derived;
5833 c = gfc_find_component (declared, "_vptr", true, true);
5834 if (c->ts.u.derived == NULL)
5835 c->ts.u.derived = gfc_find_derived_vtab (declared);
5837 if (resolve_compcall (e, &name) == FAILURE)
5840 /* Use the generic name if it is there. */
5841 name = name ? name : e->value.function.esym->name;
5842 e->symtree = expr->symtree;
5843 e->ref = gfc_copy_ref (expr->ref);
5844 gfc_add_vptr_component (e);
5845 gfc_add_component_ref (e, name);
5846 e->value.function.esym = NULL;
5851 return resolve_compcall (e, NULL);
5853 if (resolve_ref (e) == FAILURE)
5856 /* Get the CLASS declared type. */
5857 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5859 /* Weed out cases of the ultimate component being a derived type. */
5860 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5861 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5863 gfc_free_ref_list (new_ref);
5864 return resolve_compcall (e, NULL);
5867 c = gfc_find_component (declared, "_data", true, true);
5868 declared = c->ts.u.derived;
5870 /* Treat the call as if it is a typebound procedure, in order to roll
5871 out the correct name for the specific function. */
5872 if (resolve_compcall (e, &name) == FAILURE)
5876 /* Then convert the expression to a procedure pointer component call. */
5877 e->value.function.esym = NULL;
5883 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5884 gfc_add_vptr_component (e);
5885 gfc_add_component_ref (e, name);
5887 /* Recover the typespec for the expression. This is really only
5888 necessary for generic procedures, where the additional call
5889 to gfc_add_component_ref seems to throw the collection of the
5890 correct typespec. */
5895 /* Resolve a typebound subroutine, or 'method'. First separate all
5896 the non-CLASS references by calling resolve_typebound_call
5900 resolve_typebound_subroutine (gfc_code *code)
5902 gfc_symbol *declared;
5911 st = code->expr1->symtree;
5913 /* Deal with typebound operators for CLASS objects. */
5914 expr = code->expr1->value.compcall.base_object;
5915 if (expr && expr->ts.type == BT_CLASS && code->expr1->value.compcall.name)
5917 /* Since the typebound operators are generic, we have to ensure
5918 that any delays in resolution are corrected and that the vtab
5920 declared = expr->ts.u.derived;
5921 c = gfc_find_component (declared, "_vptr", true, true);
5922 if (c->ts.u.derived == NULL)
5923 c->ts.u.derived = gfc_find_derived_vtab (declared);
5925 if (resolve_typebound_call (code, &name) == FAILURE)
5928 /* Use the generic name if it is there. */
5929 name = name ? name : code->expr1->value.function.esym->name;
5930 code->expr1->symtree = expr->symtree;
5931 code->expr1->ref = gfc_copy_ref (expr->ref);
5932 gfc_add_vptr_component (code->expr1);
5933 gfc_add_component_ref (code->expr1, name);
5934 code->expr1->value.function.esym = NULL;
5939 return resolve_typebound_call (code, NULL);
5941 if (resolve_ref (code->expr1) == FAILURE)
5944 /* Get the CLASS declared type. */
5945 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5947 /* Weed out cases of the ultimate component being a derived type. */
5948 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5949 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5951 gfc_free_ref_list (new_ref);
5952 return resolve_typebound_call (code, NULL);
5955 if (resolve_typebound_call (code, &name) == FAILURE)
5957 ts = code->expr1->ts;
5959 /* Then convert the expression to a procedure pointer component call. */
5960 code->expr1->value.function.esym = NULL;
5961 code->expr1->symtree = st;
5964 code->expr1->ref = new_ref;
5966 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5967 gfc_add_vptr_component (code->expr1);
5968 gfc_add_component_ref (code->expr1, name);
5970 /* Recover the typespec for the expression. This is really only
5971 necessary for generic procedures, where the additional call
5972 to gfc_add_component_ref seems to throw the collection of the
5973 correct typespec. */
5974 code->expr1->ts = ts;
5979 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5982 resolve_ppc_call (gfc_code* c)
5984 gfc_component *comp;
5987 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5990 c->resolved_sym = c->expr1->symtree->n.sym;
5991 c->expr1->expr_type = EXPR_VARIABLE;
5993 if (!comp->attr.subroutine)
5994 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5996 if (resolve_ref (c->expr1) == FAILURE)
5999 if (update_ppc_arglist (c->expr1) == FAILURE)
6002 c->ext.actual = c->expr1->value.compcall.actual;
6004 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
6005 comp->formal == NULL) == FAILURE)
6008 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
6014 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
6017 resolve_expr_ppc (gfc_expr* e)
6019 gfc_component *comp;
6022 b = gfc_is_proc_ptr_comp (e, &comp);
6025 /* Convert to EXPR_FUNCTION. */
6026 e->expr_type = EXPR_FUNCTION;
6027 e->value.function.isym = NULL;
6028 e->value.function.actual = e->value.compcall.actual;
6030 if (comp->as != NULL)
6031 e->rank = comp->as->rank;
6033 if (!comp->attr.function)
6034 gfc_add_function (&comp->attr, comp->name, &e->where);
6036 if (resolve_ref (e) == FAILURE)
6039 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
6040 comp->formal == NULL) == FAILURE)
6043 if (update_ppc_arglist (e) == FAILURE)
6046 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
6053 gfc_is_expandable_expr (gfc_expr *e)
6055 gfc_constructor *con;
6057 if (e->expr_type == EXPR_ARRAY)
6059 /* Traverse the constructor looking for variables that are flavor
6060 parameter. Parameters must be expanded since they are fully used at
6062 con = gfc_constructor_first (e->value.constructor);
6063 for (; con; con = gfc_constructor_next (con))
6065 if (con->expr->expr_type == EXPR_VARIABLE
6066 && con->expr->symtree
6067 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
6068 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
6070 if (con->expr->expr_type == EXPR_ARRAY
6071 && gfc_is_expandable_expr (con->expr))
6079 /* Resolve an expression. That is, make sure that types of operands agree
6080 with their operators, intrinsic operators are converted to function calls
6081 for overloaded types and unresolved function references are resolved. */
6084 gfc_resolve_expr (gfc_expr *e)
6092 /* inquiry_argument only applies to variables. */
6093 inquiry_save = inquiry_argument;
6094 if (e->expr_type != EXPR_VARIABLE)
6095 inquiry_argument = false;
6097 switch (e->expr_type)
6100 t = resolve_operator (e);
6106 if (check_host_association (e))
6107 t = resolve_function (e);
6110 t = resolve_variable (e);
6112 expression_rank (e);
6115 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
6116 && e->ref->type != REF_SUBSTRING)
6117 gfc_resolve_substring_charlen (e);
6122 t = resolve_typebound_function (e);
6125 case EXPR_SUBSTRING:
6126 t = resolve_ref (e);
6135 t = resolve_expr_ppc (e);
6140 if (resolve_ref (e) == FAILURE)
6143 t = gfc_resolve_array_constructor (e);
6144 /* Also try to expand a constructor. */
6147 expression_rank (e);
6148 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
6149 gfc_expand_constructor (e, false);
6152 /* This provides the opportunity for the length of constructors with
6153 character valued function elements to propagate the string length
6154 to the expression. */
6155 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
6157 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
6158 here rather then add a duplicate test for it above. */
6159 gfc_expand_constructor (e, false);
6160 t = gfc_resolve_character_array_constructor (e);
6165 case EXPR_STRUCTURE:
6166 t = resolve_ref (e);
6170 t = resolve_structure_cons (e, 0);
6174 t = gfc_simplify_expr (e, 0);
6178 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
6181 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
6184 inquiry_argument = inquiry_save;
6190 /* Resolve an expression from an iterator. They must be scalar and have
6191 INTEGER or (optionally) REAL type. */
6194 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
6195 const char *name_msgid)
6197 if (gfc_resolve_expr (expr) == FAILURE)
6200 if (expr->rank != 0)
6202 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
6206 if (expr->ts.type != BT_INTEGER)
6208 if (expr->ts.type == BT_REAL)
6211 return gfc_notify_std (GFC_STD_F95_DEL,
6212 "Deleted feature: %s at %L must be integer",
6213 _(name_msgid), &expr->where);
6216 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
6223 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
6231 /* Resolve the expressions in an iterator structure. If REAL_OK is
6232 false allow only INTEGER type iterators, otherwise allow REAL types. */
6235 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
6237 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
6241 if (gfc_check_vardef_context (iter->var, false, false, _("iterator variable"))
6245 if (gfc_resolve_iterator_expr (iter->start, real_ok,
6246 "Start expression in DO loop") == FAILURE)
6249 if (gfc_resolve_iterator_expr (iter->end, real_ok,
6250 "End expression in DO loop") == FAILURE)
6253 if (gfc_resolve_iterator_expr (iter->step, real_ok,
6254 "Step expression in DO loop") == FAILURE)
6257 if (iter->step->expr_type == EXPR_CONSTANT)
6259 if ((iter->step->ts.type == BT_INTEGER
6260 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
6261 || (iter->step->ts.type == BT_REAL
6262 && mpfr_sgn (iter->step->value.real) == 0))
6264 gfc_error ("Step expression in DO loop at %L cannot be zero",
6265 &iter->step->where);
6270 /* Convert start, end, and step to the same type as var. */
6271 if (iter->start->ts.kind != iter->var->ts.kind
6272 || iter->start->ts.type != iter->var->ts.type)
6273 gfc_convert_type (iter->start, &iter->var->ts, 2);
6275 if (iter->end->ts.kind != iter->var->ts.kind
6276 || iter->end->ts.type != iter->var->ts.type)
6277 gfc_convert_type (iter->end, &iter->var->ts, 2);
6279 if (iter->step->ts.kind != iter->var->ts.kind
6280 || iter->step->ts.type != iter->var->ts.type)
6281 gfc_convert_type (iter->step, &iter->var->ts, 2);
6283 if (iter->start->expr_type == EXPR_CONSTANT
6284 && iter->end->expr_type == EXPR_CONSTANT
6285 && iter->step->expr_type == EXPR_CONSTANT)
6288 if (iter->start->ts.type == BT_INTEGER)
6290 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
6291 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
6295 sgn = mpfr_sgn (iter->step->value.real);
6296 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
6298 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
6299 gfc_warning ("DO loop at %L will be executed zero times",
6300 &iter->step->where);
6307 /* Traversal function for find_forall_index. f == 2 signals that
6308 that variable itself is not to be checked - only the references. */
6311 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6313 if (expr->expr_type != EXPR_VARIABLE)
6316 /* A scalar assignment */
6317 if (!expr->ref || *f == 1)
6319 if (expr->symtree->n.sym == sym)
6331 /* Check whether the FORALL index appears in the expression or not.
6332 Returns SUCCESS if SYM is found in EXPR. */
6335 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6337 if (gfc_traverse_expr (expr, sym, forall_index, f))
6344 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6345 to be a scalar INTEGER variable. The subscripts and stride are scalar
6346 INTEGERs, and if stride is a constant it must be nonzero.
6347 Furthermore "A subscript or stride in a forall-triplet-spec shall
6348 not contain a reference to any index-name in the
6349 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6352 resolve_forall_iterators (gfc_forall_iterator *it)
6354 gfc_forall_iterator *iter, *iter2;
6356 for (iter = it; iter; iter = iter->next)
6358 if (gfc_resolve_expr (iter->var) == SUCCESS
6359 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6360 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6363 if (gfc_resolve_expr (iter->start) == SUCCESS
6364 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6365 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6366 &iter->start->where);
6367 if (iter->var->ts.kind != iter->start->ts.kind)
6368 gfc_convert_type (iter->start, &iter->var->ts, 2);
6370 if (gfc_resolve_expr (iter->end) == SUCCESS
6371 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6372 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6374 if (iter->var->ts.kind != iter->end->ts.kind)
6375 gfc_convert_type (iter->end, &iter->var->ts, 2);
6377 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6379 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6380 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6381 &iter->stride->where, "INTEGER");
6383 if (iter->stride->expr_type == EXPR_CONSTANT
6384 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6385 gfc_error ("FORALL stride expression at %L cannot be zero",
6386 &iter->stride->where);
6388 if (iter->var->ts.kind != iter->stride->ts.kind)
6389 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6392 for (iter = it; iter; iter = iter->next)
6393 for (iter2 = iter; iter2; iter2 = iter2->next)
6395 if (find_forall_index (iter2->start,
6396 iter->var->symtree->n.sym, 0) == SUCCESS
6397 || find_forall_index (iter2->end,
6398 iter->var->symtree->n.sym, 0) == SUCCESS
6399 || find_forall_index (iter2->stride,
6400 iter->var->symtree->n.sym, 0) == SUCCESS)
6401 gfc_error ("FORALL index '%s' may not appear in triplet "
6402 "specification at %L", iter->var->symtree->name,
6403 &iter2->start->where);
6408 /* Given a pointer to a symbol that is a derived type, see if it's
6409 inaccessible, i.e. if it's defined in another module and the components are
6410 PRIVATE. The search is recursive if necessary. Returns zero if no
6411 inaccessible components are found, nonzero otherwise. */
6414 derived_inaccessible (gfc_symbol *sym)
6418 if (sym->attr.use_assoc && sym->attr.private_comp)
6421 for (c = sym->components; c; c = c->next)
6423 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6431 /* Resolve the argument of a deallocate expression. The expression must be
6432 a pointer or a full array. */
6435 resolve_deallocate_expr (gfc_expr *e)
6437 symbol_attribute attr;
6438 int allocatable, pointer;
6443 if (gfc_resolve_expr (e) == FAILURE)
6446 if (e->expr_type != EXPR_VARIABLE)
6449 sym = e->symtree->n.sym;
6451 if (sym->ts.type == BT_CLASS)
6453 allocatable = CLASS_DATA (sym)->attr.allocatable;
6454 pointer = CLASS_DATA (sym)->attr.class_pointer;
6458 allocatable = sym->attr.allocatable;
6459 pointer = sym->attr.pointer;
6461 for (ref = e->ref; ref; ref = ref->next)
6466 if (ref->u.ar.type != AR_FULL
6467 && !(ref->u.ar.type == AR_ELEMENT && ref->u.ar.as->rank == 0
6468 && ref->u.ar.codimen && gfc_ref_this_image (ref)))
6473 c = ref->u.c.component;
6474 if (c->ts.type == BT_CLASS)
6476 allocatable = CLASS_DATA (c)->attr.allocatable;
6477 pointer = CLASS_DATA (c)->attr.class_pointer;
6481 allocatable = c->attr.allocatable;
6482 pointer = c->attr.pointer;
6492 attr = gfc_expr_attr (e);
6494 if (allocatable == 0 && attr.pointer == 0)
6497 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6503 if (gfc_is_coindexed (e))
6505 gfc_error ("Coindexed allocatable object at %L", &e->where);
6510 && gfc_check_vardef_context (e, true, true, _("DEALLOCATE object"))
6513 if (gfc_check_vardef_context (e, false, true, _("DEALLOCATE object"))
6521 /* Returns true if the expression e contains a reference to the symbol sym. */
6523 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6525 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6532 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6534 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6538 /* Given the expression node e for an allocatable/pointer of derived type to be
6539 allocated, get the expression node to be initialized afterwards (needed for
6540 derived types with default initializers, and derived types with allocatable
6541 components that need nullification.) */
6544 gfc_expr_to_initialize (gfc_expr *e)
6550 result = gfc_copy_expr (e);
6552 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6553 for (ref = result->ref; ref; ref = ref->next)
6554 if (ref->type == REF_ARRAY && ref->next == NULL)
6556 ref->u.ar.type = AR_FULL;
6558 for (i = 0; i < ref->u.ar.dimen; i++)
6559 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6561 result->rank = ref->u.ar.dimen;
6569 /* If the last ref of an expression is an array ref, return a copy of the
6570 expression with that one removed. Otherwise, a copy of the original
6571 expression. This is used for allocate-expressions and pointer assignment
6572 LHS, where there may be an array specification that needs to be stripped
6573 off when using gfc_check_vardef_context. */
6576 remove_last_array_ref (gfc_expr* e)
6581 e2 = gfc_copy_expr (e);
6582 for (r = &e2->ref; *r; r = &(*r)->next)
6583 if ((*r)->type == REF_ARRAY && !(*r)->next)
6585 gfc_free_ref_list (*r);
6594 /* Used in resolve_allocate_expr to check that a allocation-object and
6595 a source-expr are conformable. This does not catch all possible
6596 cases; in particular a runtime checking is needed. */
6599 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6602 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6604 /* First compare rank. */
6605 if (tail && e1->rank != tail->u.ar.as->rank)
6607 gfc_error ("Source-expr at %L must be scalar or have the "
6608 "same rank as the allocate-object at %L",
6609 &e1->where, &e2->where);
6620 for (i = 0; i < e1->rank; i++)
6622 if (tail->u.ar.end[i])
6624 mpz_set (s, tail->u.ar.end[i]->value.integer);
6625 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6626 mpz_add_ui (s, s, 1);
6630 mpz_set (s, tail->u.ar.start[i]->value.integer);
6633 if (mpz_cmp (e1->shape[i], s) != 0)
6635 gfc_error ("Source-expr at %L and allocate-object at %L must "
6636 "have the same shape", &e1->where, &e2->where);
6649 /* Resolve the expression in an ALLOCATE statement, doing the additional
6650 checks to see whether the expression is OK or not. The expression must
6651 have a trailing array reference that gives the size of the array. */
6654 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6656 int i, pointer, allocatable, dimension, is_abstract;
6659 symbol_attribute attr;
6660 gfc_ref *ref, *ref2;
6663 gfc_symbol *sym = NULL;
6668 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6669 checking of coarrays. */
6670 for (ref = e->ref; ref; ref = ref->next)
6671 if (ref->next == NULL)
6674 if (ref && ref->type == REF_ARRAY)
6675 ref->u.ar.in_allocate = true;
6677 if (gfc_resolve_expr (e) == FAILURE)
6680 /* Make sure the expression is allocatable or a pointer. If it is
6681 pointer, the next-to-last reference must be a pointer. */
6685 sym = e->symtree->n.sym;
6687 /* Check whether ultimate component is abstract and CLASS. */
6690 if (e->expr_type != EXPR_VARIABLE)
6693 attr = gfc_expr_attr (e);
6694 pointer = attr.pointer;
6695 dimension = attr.dimension;
6696 codimension = attr.codimension;
6700 if (sym->ts.type == BT_CLASS)
6702 allocatable = CLASS_DATA (sym)->attr.allocatable;
6703 pointer = CLASS_DATA (sym)->attr.class_pointer;
6704 dimension = CLASS_DATA (sym)->attr.dimension;
6705 codimension = CLASS_DATA (sym)->attr.codimension;
6706 is_abstract = CLASS_DATA (sym)->attr.abstract;
6710 allocatable = sym->attr.allocatable;
6711 pointer = sym->attr.pointer;
6712 dimension = sym->attr.dimension;
6713 codimension = sym->attr.codimension;
6718 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6723 if (ref->u.ar.codimen > 0)
6726 for (n = ref->u.ar.dimen;
6727 n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
6728 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
6735 if (ref->next != NULL)
6743 gfc_error ("Coindexed allocatable object at %L",
6748 c = ref->u.c.component;
6749 if (c->ts.type == BT_CLASS)
6751 allocatable = CLASS_DATA (c)->attr.allocatable;
6752 pointer = CLASS_DATA (c)->attr.class_pointer;
6753 dimension = CLASS_DATA (c)->attr.dimension;
6754 codimension = CLASS_DATA (c)->attr.codimension;
6755 is_abstract = CLASS_DATA (c)->attr.abstract;
6759 allocatable = c->attr.allocatable;
6760 pointer = c->attr.pointer;
6761 dimension = c->attr.dimension;
6762 codimension = c->attr.codimension;
6763 is_abstract = c->attr.abstract;
6775 if (allocatable == 0 && pointer == 0)
6777 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6782 /* Some checks for the SOURCE tag. */
6785 /* Check F03:C631. */
6786 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6788 gfc_error ("Type of entity at %L is type incompatible with "
6789 "source-expr at %L", &e->where, &code->expr3->where);
6793 /* Check F03:C632 and restriction following Note 6.18. */
6794 if (code->expr3->rank > 0
6795 && conformable_arrays (code->expr3, e) == FAILURE)
6798 /* Check F03:C633. */
6799 if (code->expr3->ts.kind != e->ts.kind)
6801 gfc_error ("The allocate-object at %L and the source-expr at %L "
6802 "shall have the same kind type parameter",
6803 &e->where, &code->expr3->where);
6807 /* Check F2008, C642. */
6808 if (code->expr3->ts.type == BT_DERIVED
6809 && ((codimension && gfc_expr_attr (code->expr3).lock_comp)
6810 || (code->expr3->ts.u.derived->from_intmod
6811 == INTMOD_ISO_FORTRAN_ENV
6812 && code->expr3->ts.u.derived->intmod_sym_id
6813 == ISOFORTRAN_LOCK_TYPE)))
6815 gfc_error ("The source-expr at %L shall neither be of type "
6816 "LOCK_TYPE nor have a LOCK_TYPE component if "
6817 "allocate-object at %L is a coarray",
6818 &code->expr3->where, &e->where);
6823 /* Check F08:C629. */
6824 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6827 gcc_assert (e->ts.type == BT_CLASS);
6828 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6829 "type-spec or source-expr", sym->name, &e->where);
6833 /* In the variable definition context checks, gfc_expr_attr is used
6834 on the expression. This is fooled by the array specification
6835 present in e, thus we have to eliminate that one temporarily. */
6836 e2 = remove_last_array_ref (e);
6838 if (t == SUCCESS && pointer)
6839 t = gfc_check_vardef_context (e2, true, true, _("ALLOCATE object"));
6841 t = gfc_check_vardef_context (e2, false, true, _("ALLOCATE object"));
6848 /* Set up default initializer if needed. */
6852 if (code->ext.alloc.ts.type == BT_DERIVED)
6853 ts = code->ext.alloc.ts;
6857 if (ts.type == BT_CLASS)
6858 ts = ts.u.derived->components->ts;
6860 if (ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&ts)))
6862 gfc_code *init_st = gfc_get_code ();
6863 init_st->loc = code->loc;
6864 init_st->op = EXEC_INIT_ASSIGN;
6865 init_st->expr1 = gfc_expr_to_initialize (e);
6866 init_st->expr2 = init_e;
6867 init_st->next = code->next;
6868 code->next = init_st;
6871 else if (code->expr3->mold && code->expr3->ts.type == BT_DERIVED)
6873 /* Default initialization via MOLD (non-polymorphic). */
6874 gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
6875 gfc_resolve_expr (rhs);
6876 gfc_free_expr (code->expr3);
6880 if (e->ts.type == BT_CLASS)
6882 /* Make sure the vtab symbol is present when
6883 the module variables are generated. */
6884 gfc_typespec ts = e->ts;
6886 ts = code->expr3->ts;
6887 else if (code->ext.alloc.ts.type == BT_DERIVED)
6888 ts = code->ext.alloc.ts;
6889 gfc_find_derived_vtab (ts.u.derived);
6892 if (dimension == 0 && codimension == 0)
6895 /* Make sure the last reference node is an array specifiction. */
6897 if (!ref2 || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6898 || (dimension && ref2->u.ar.dimen == 0))
6900 gfc_error ("Array specification required in ALLOCATE statement "
6901 "at %L", &e->where);
6905 /* Make sure that the array section reference makes sense in the
6906 context of an ALLOCATE specification. */
6911 for (i = ar->dimen; i < ar->dimen + ar->codimen; i++)
6912 if (ar->dimen_type[i] == DIMEN_THIS_IMAGE)
6914 gfc_error ("Coarray specification required in ALLOCATE statement "
6915 "at %L", &e->where);
6919 for (i = 0; i < ar->dimen; i++)
6921 if (ref2->u.ar.type == AR_ELEMENT)
6924 switch (ar->dimen_type[i])
6930 if (ar->start[i] != NULL
6931 && ar->end[i] != NULL
6932 && ar->stride[i] == NULL)
6935 /* Fall Through... */
6940 case DIMEN_THIS_IMAGE:
6941 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6947 for (a = code->ext.alloc.list; a; a = a->next)
6949 sym = a->expr->symtree->n.sym;
6951 /* TODO - check derived type components. */
6952 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6955 if ((ar->start[i] != NULL
6956 && gfc_find_sym_in_expr (sym, ar->start[i]))
6957 || (ar->end[i] != NULL
6958 && gfc_find_sym_in_expr (sym, ar->end[i])))
6960 gfc_error ("'%s' must not appear in the array specification at "
6961 "%L in the same ALLOCATE statement where it is "
6962 "itself allocated", sym->name, &ar->where);
6968 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6970 if (ar->dimen_type[i] == DIMEN_ELEMENT
6971 || ar->dimen_type[i] == DIMEN_RANGE)
6973 if (i == (ar->dimen + ar->codimen - 1))
6975 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6976 "statement at %L", &e->where);
6982 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6983 && ar->stride[i] == NULL)
6986 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6999 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
7001 gfc_expr *stat, *errmsg, *pe, *qe;
7002 gfc_alloc *a, *p, *q;
7005 errmsg = code->expr2;
7007 /* Check the stat variable. */
7010 gfc_check_vardef_context (stat, false, false, _("STAT variable"));
7012 if ((stat->ts.type != BT_INTEGER
7013 && !(stat->ref && (stat->ref->type == REF_ARRAY
7014 || stat->ref->type == REF_COMPONENT)))
7016 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
7017 "variable", &stat->where);
7019 for (p = code->ext.alloc.list; p; p = p->next)
7020 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
7022 gfc_ref *ref1, *ref2;
7025 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
7026 ref1 = ref1->next, ref2 = ref2->next)
7028 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7030 if (ref1->u.c.component->name != ref2->u.c.component->name)
7039 gfc_error ("Stat-variable at %L shall not be %sd within "
7040 "the same %s statement", &stat->where, fcn, fcn);
7046 /* Check the errmsg variable. */
7050 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
7053 gfc_check_vardef_context (errmsg, false, false, _("ERRMSG variable"));
7055 if ((errmsg->ts.type != BT_CHARACTER
7057 && (errmsg->ref->type == REF_ARRAY
7058 || errmsg->ref->type == REF_COMPONENT)))
7059 || errmsg->rank > 0 )
7060 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
7061 "variable", &errmsg->where);
7063 for (p = code->ext.alloc.list; p; p = p->next)
7064 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
7066 gfc_ref *ref1, *ref2;
7069 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
7070 ref1 = ref1->next, ref2 = ref2->next)
7072 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7074 if (ref1->u.c.component->name != ref2->u.c.component->name)
7083 gfc_error ("Errmsg-variable at %L shall not be %sd within "
7084 "the same %s statement", &errmsg->where, fcn, fcn);
7090 /* Check that an allocate-object appears only once in the statement.
7091 FIXME: Checking derived types is disabled. */
7092 for (p = code->ext.alloc.list; p; p = p->next)
7095 for (q = p->next; q; q = q->next)
7098 if (pe->symtree->n.sym->name == qe->symtree->n.sym->name)
7100 /* This is a potential collision. */
7101 gfc_ref *pr = pe->ref;
7102 gfc_ref *qr = qe->ref;
7104 /* Follow the references until
7105 a) They start to differ, in which case there is no error;
7106 you can deallocate a%b and a%c in a single statement
7107 b) Both of them stop, which is an error
7108 c) One of them stops, which is also an error. */
7111 if (pr == NULL && qr == NULL)
7113 gfc_error ("Allocate-object at %L also appears at %L",
7114 &pe->where, &qe->where);
7117 else if (pr != NULL && qr == NULL)
7119 gfc_error ("Allocate-object at %L is subobject of"
7120 " object at %L", &pe->where, &qe->where);
7123 else if (pr == NULL && qr != NULL)
7125 gfc_error ("Allocate-object at %L is subobject of"
7126 " object at %L", &qe->where, &pe->where);
7129 /* Here, pr != NULL && qr != NULL */
7130 gcc_assert(pr->type == qr->type);
7131 if (pr->type == REF_ARRAY)
7133 /* Handle cases like allocate(v(3)%x(3), v(2)%x(3)),
7135 gcc_assert (qr->type == REF_ARRAY);
7137 if (pr->next && qr->next)
7139 gfc_array_ref *par = &(pr->u.ar);
7140 gfc_array_ref *qar = &(qr->u.ar);
7141 if (gfc_dep_compare_expr (par->start[0],
7142 qar->start[0]) != 0)
7148 if (pr->u.c.component->name != qr->u.c.component->name)
7159 if (strcmp (fcn, "ALLOCATE") == 0)
7161 for (a = code->ext.alloc.list; a; a = a->next)
7162 resolve_allocate_expr (a->expr, code);
7166 for (a = code->ext.alloc.list; a; a = a->next)
7167 resolve_deallocate_expr (a->expr);
7172 /************ SELECT CASE resolution subroutines ************/
7174 /* Callback function for our mergesort variant. Determines interval
7175 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
7176 op1 > op2. Assumes we're not dealing with the default case.
7177 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
7178 There are nine situations to check. */
7181 compare_cases (const gfc_case *op1, const gfc_case *op2)
7185 if (op1->low == NULL) /* op1 = (:L) */
7187 /* op2 = (:N), so overlap. */
7189 /* op2 = (M:) or (M:N), L < M */
7190 if (op2->low != NULL
7191 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7194 else if (op1->high == NULL) /* op1 = (K:) */
7196 /* op2 = (M:), so overlap. */
7198 /* op2 = (:N) or (M:N), K > N */
7199 if (op2->high != NULL
7200 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7203 else /* op1 = (K:L) */
7205 if (op2->low == NULL) /* op2 = (:N), K > N */
7206 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7208 else if (op2->high == NULL) /* op2 = (M:), L < M */
7209 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7211 else /* op2 = (M:N) */
7215 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7218 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7227 /* Merge-sort a double linked case list, detecting overlap in the
7228 process. LIST is the head of the double linked case list before it
7229 is sorted. Returns the head of the sorted list if we don't see any
7230 overlap, or NULL otherwise. */
7233 check_case_overlap (gfc_case *list)
7235 gfc_case *p, *q, *e, *tail;
7236 int insize, nmerges, psize, qsize, cmp, overlap_seen;
7238 /* If the passed list was empty, return immediately. */
7245 /* Loop unconditionally. The only exit from this loop is a return
7246 statement, when we've finished sorting the case list. */
7253 /* Count the number of merges we do in this pass. */
7256 /* Loop while there exists a merge to be done. */
7261 /* Count this merge. */
7264 /* Cut the list in two pieces by stepping INSIZE places
7265 forward in the list, starting from P. */
7268 for (i = 0; i < insize; i++)
7277 /* Now we have two lists. Merge them! */
7278 while (psize > 0 || (qsize > 0 && q != NULL))
7280 /* See from which the next case to merge comes from. */
7283 /* P is empty so the next case must come from Q. */
7288 else if (qsize == 0 || q == NULL)
7297 cmp = compare_cases (p, q);
7300 /* The whole case range for P is less than the
7308 /* The whole case range for Q is greater than
7309 the case range for P. */
7316 /* The cases overlap, or they are the same
7317 element in the list. Either way, we must
7318 issue an error and get the next case from P. */
7319 /* FIXME: Sort P and Q by line number. */
7320 gfc_error ("CASE label at %L overlaps with CASE "
7321 "label at %L", &p->where, &q->where);
7329 /* Add the next element to the merged list. */
7338 /* P has now stepped INSIZE places along, and so has Q. So
7339 they're the same. */
7344 /* If we have done only one merge or none at all, we've
7345 finished sorting the cases. */
7354 /* Otherwise repeat, merging lists twice the size. */
7360 /* Check to see if an expression is suitable for use in a CASE statement.
7361 Makes sure that all case expressions are scalar constants of the same
7362 type. Return FAILURE if anything is wrong. */
7365 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
7367 if (e == NULL) return SUCCESS;
7369 if (e->ts.type != case_expr->ts.type)
7371 gfc_error ("Expression in CASE statement at %L must be of type %s",
7372 &e->where, gfc_basic_typename (case_expr->ts.type));
7376 /* C805 (R808) For a given case-construct, each case-value shall be of
7377 the same type as case-expr. For character type, length differences
7378 are allowed, but the kind type parameters shall be the same. */
7380 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
7382 gfc_error ("Expression in CASE statement at %L must be of kind %d",
7383 &e->where, case_expr->ts.kind);
7387 /* Convert the case value kind to that of case expression kind,
7390 if (e->ts.kind != case_expr->ts.kind)
7391 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
7395 gfc_error ("Expression in CASE statement at %L must be scalar",
7404 /* Given a completely parsed select statement, we:
7406 - Validate all expressions and code within the SELECT.
7407 - Make sure that the selection expression is not of the wrong type.
7408 - Make sure that no case ranges overlap.
7409 - Eliminate unreachable cases and unreachable code resulting from
7410 removing case labels.
7412 The standard does allow unreachable cases, e.g. CASE (5:3). But
7413 they are a hassle for code generation, and to prevent that, we just
7414 cut them out here. This is not necessary for overlapping cases
7415 because they are illegal and we never even try to generate code.
7417 We have the additional caveat that a SELECT construct could have
7418 been a computed GOTO in the source code. Fortunately we can fairly
7419 easily work around that here: The case_expr for a "real" SELECT CASE
7420 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7421 we have to do is make sure that the case_expr is a scalar integer
7425 resolve_select (gfc_code *code)
7428 gfc_expr *case_expr;
7429 gfc_case *cp, *default_case, *tail, *head;
7430 int seen_unreachable;
7436 if (code->expr1 == NULL)
7438 /* This was actually a computed GOTO statement. */
7439 case_expr = code->expr2;
7440 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7441 gfc_error ("Selection expression in computed GOTO statement "
7442 "at %L must be a scalar integer expression",
7445 /* Further checking is not necessary because this SELECT was built
7446 by the compiler, so it should always be OK. Just move the
7447 case_expr from expr2 to expr so that we can handle computed
7448 GOTOs as normal SELECTs from here on. */
7449 code->expr1 = code->expr2;
7454 case_expr = code->expr1;
7456 type = case_expr->ts.type;
7457 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7459 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7460 &case_expr->where, gfc_typename (&case_expr->ts));
7462 /* Punt. Going on here just produce more garbage error messages. */
7466 if (case_expr->rank != 0)
7468 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7469 "expression", &case_expr->where);
7476 /* Raise a warning if an INTEGER case value exceeds the range of
7477 the case-expr. Later, all expressions will be promoted to the
7478 largest kind of all case-labels. */
7480 if (type == BT_INTEGER)
7481 for (body = code->block; body; body = body->block)
7482 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7485 && gfc_check_integer_range (cp->low->value.integer,
7486 case_expr->ts.kind) != ARITH_OK)
7487 gfc_warning ("Expression in CASE statement at %L is "
7488 "not in the range of %s", &cp->low->where,
7489 gfc_typename (&case_expr->ts));
7492 && cp->low != cp->high
7493 && gfc_check_integer_range (cp->high->value.integer,
7494 case_expr->ts.kind) != ARITH_OK)
7495 gfc_warning ("Expression in CASE statement at %L is "
7496 "not in the range of %s", &cp->high->where,
7497 gfc_typename (&case_expr->ts));
7500 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7501 of the SELECT CASE expression and its CASE values. Walk the lists
7502 of case values, and if we find a mismatch, promote case_expr to
7503 the appropriate kind. */
7505 if (type == BT_LOGICAL || type == BT_INTEGER)
7507 for (body = code->block; body; body = body->block)
7509 /* Walk the case label list. */
7510 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7512 /* Intercept the DEFAULT case. It does not have a kind. */
7513 if (cp->low == NULL && cp->high == NULL)
7516 /* Unreachable case ranges are discarded, so ignore. */
7517 if (cp->low != NULL && cp->high != NULL
7518 && cp->low != cp->high
7519 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7523 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7524 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7526 if (cp->high != NULL
7527 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7528 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7533 /* Assume there is no DEFAULT case. */
7534 default_case = NULL;
7539 for (body = code->block; body; body = body->block)
7541 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7543 seen_unreachable = 0;
7545 /* Walk the case label list, making sure that all case labels
7547 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7549 /* Count the number of cases in the whole construct. */
7552 /* Intercept the DEFAULT case. */
7553 if (cp->low == NULL && cp->high == NULL)
7555 if (default_case != NULL)
7557 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7558 "by a second DEFAULT CASE at %L",
7559 &default_case->where, &cp->where);
7570 /* Deal with single value cases and case ranges. Errors are
7571 issued from the validation function. */
7572 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7573 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7579 if (type == BT_LOGICAL
7580 && ((cp->low == NULL || cp->high == NULL)
7581 || cp->low != cp->high))
7583 gfc_error ("Logical range in CASE statement at %L is not "
7584 "allowed", &cp->low->where);
7589 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7592 value = cp->low->value.logical == 0 ? 2 : 1;
7593 if (value & seen_logical)
7595 gfc_error ("Constant logical value in CASE statement "
7596 "is repeated at %L",
7601 seen_logical |= value;
7604 if (cp->low != NULL && cp->high != NULL
7605 && cp->low != cp->high
7606 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7608 if (gfc_option.warn_surprising)
7609 gfc_warning ("Range specification at %L can never "
7610 "be matched", &cp->where);
7612 cp->unreachable = 1;
7613 seen_unreachable = 1;
7617 /* If the case range can be matched, it can also overlap with
7618 other cases. To make sure it does not, we put it in a
7619 double linked list here. We sort that with a merge sort
7620 later on to detect any overlapping cases. */
7624 head->right = head->left = NULL;
7629 tail->right->left = tail;
7636 /* It there was a failure in the previous case label, give up
7637 for this case label list. Continue with the next block. */
7641 /* See if any case labels that are unreachable have been seen.
7642 If so, we eliminate them. This is a bit of a kludge because
7643 the case lists for a single case statement (label) is a
7644 single forward linked lists. */
7645 if (seen_unreachable)
7647 /* Advance until the first case in the list is reachable. */
7648 while (body->ext.block.case_list != NULL
7649 && body->ext.block.case_list->unreachable)
7651 gfc_case *n = body->ext.block.case_list;
7652 body->ext.block.case_list = body->ext.block.case_list->next;
7654 gfc_free_case_list (n);
7657 /* Strip all other unreachable cases. */
7658 if (body->ext.block.case_list)
7660 for (cp = body->ext.block.case_list; cp->next; cp = cp->next)
7662 if (cp->next->unreachable)
7664 gfc_case *n = cp->next;
7665 cp->next = cp->next->next;
7667 gfc_free_case_list (n);
7674 /* See if there were overlapping cases. If the check returns NULL,
7675 there was overlap. In that case we don't do anything. If head
7676 is non-NULL, we prepend the DEFAULT case. The sorted list can
7677 then used during code generation for SELECT CASE constructs with
7678 a case expression of a CHARACTER type. */
7681 head = check_case_overlap (head);
7683 /* Prepend the default_case if it is there. */
7684 if (head != NULL && default_case)
7686 default_case->left = NULL;
7687 default_case->right = head;
7688 head->left = default_case;
7692 /* Eliminate dead blocks that may be the result if we've seen
7693 unreachable case labels for a block. */
7694 for (body = code; body && body->block; body = body->block)
7696 if (body->block->ext.block.case_list == NULL)
7698 /* Cut the unreachable block from the code chain. */
7699 gfc_code *c = body->block;
7700 body->block = c->block;
7702 /* Kill the dead block, but not the blocks below it. */
7704 gfc_free_statements (c);
7708 /* More than two cases is legal but insane for logical selects.
7709 Issue a warning for it. */
7710 if (gfc_option.warn_surprising && type == BT_LOGICAL
7712 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7717 /* Check if a derived type is extensible. */
7720 gfc_type_is_extensible (gfc_symbol *sym)
7722 return !(sym->attr.is_bind_c || sym->attr.sequence);
7726 /* Resolve an associate name: Resolve target and ensure the type-spec is
7727 correct as well as possibly the array-spec. */
7730 resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
7734 gcc_assert (sym->assoc);
7735 gcc_assert (sym->attr.flavor == FL_VARIABLE);
7737 /* If this is for SELECT TYPE, the target may not yet be set. In that
7738 case, return. Resolution will be called later manually again when
7740 target = sym->assoc->target;
7743 gcc_assert (!sym->assoc->dangling);
7745 if (resolve_target && gfc_resolve_expr (target) != SUCCESS)
7748 /* For variable targets, we get some attributes from the target. */
7749 if (target->expr_type == EXPR_VARIABLE)
7753 gcc_assert (target->symtree);
7754 tsym = target->symtree->n.sym;
7756 sym->attr.asynchronous = tsym->attr.asynchronous;
7757 sym->attr.volatile_ = tsym->attr.volatile_;
7759 sym->attr.target = (tsym->attr.target || tsym->attr.pointer);
7762 /* Get type if this was not already set. Note that it can be
7763 some other type than the target in case this is a SELECT TYPE
7764 selector! So we must not update when the type is already there. */
7765 if (sym->ts.type == BT_UNKNOWN)
7766 sym->ts = target->ts;
7767 gcc_assert (sym->ts.type != BT_UNKNOWN);
7769 /* See if this is a valid association-to-variable. */
7770 sym->assoc->variable = (target->expr_type == EXPR_VARIABLE
7771 && !gfc_has_vector_subscript (target));
7773 /* Finally resolve if this is an array or not. */
7774 if (sym->attr.dimension && target->rank == 0)
7776 gfc_error ("Associate-name '%s' at %L is used as array",
7777 sym->name, &sym->declared_at);
7778 sym->attr.dimension = 0;
7781 if (target->rank > 0)
7782 sym->attr.dimension = 1;
7784 if (sym->attr.dimension)
7786 sym->as = gfc_get_array_spec ();
7787 sym->as->rank = target->rank;
7788 sym->as->type = AS_DEFERRED;
7790 /* Target must not be coindexed, thus the associate-variable
7792 sym->as->corank = 0;
7797 /* Resolve a SELECT TYPE statement. */
7800 resolve_select_type (gfc_code *code, gfc_namespace *old_ns)
7802 gfc_symbol *selector_type;
7803 gfc_code *body, *new_st, *if_st, *tail;
7804 gfc_code *class_is = NULL, *default_case = NULL;
7807 char name[GFC_MAX_SYMBOL_LEN];
7811 ns = code->ext.block.ns;
7814 /* Check for F03:C813. */
7815 if (code->expr1->ts.type != BT_CLASS
7816 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7818 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7819 "at %L", &code->loc);
7825 if (code->expr1->symtree->n.sym->attr.untyped)
7826 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7827 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7830 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7832 /* Loop over TYPE IS / CLASS IS cases. */
7833 for (body = code->block; body; body = body->block)
7835 c = body->ext.block.case_list;
7837 /* Check F03:C815. */
7838 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7839 && !gfc_type_is_extensible (c->ts.u.derived))
7841 gfc_error ("Derived type '%s' at %L must be extensible",
7842 c->ts.u.derived->name, &c->where);
7847 /* Check F03:C816. */
7848 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7849 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7851 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7852 c->ts.u.derived->name, &c->where, selector_type->name);
7857 /* Intercept the DEFAULT case. */
7858 if (c->ts.type == BT_UNKNOWN)
7860 /* Check F03:C818. */
7863 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7864 "by a second DEFAULT CASE at %L",
7865 &default_case->ext.block.case_list->where, &c->where);
7870 default_case = body;
7877 /* Transform SELECT TYPE statement to BLOCK and associate selector to
7878 target if present. If there are any EXIT statements referring to the
7879 SELECT TYPE construct, this is no problem because the gfc_code
7880 reference stays the same and EXIT is equally possible from the BLOCK
7881 it is changed to. */
7882 code->op = EXEC_BLOCK;
7885 gfc_association_list* assoc;
7887 assoc = gfc_get_association_list ();
7888 assoc->st = code->expr1->symtree;
7889 assoc->target = gfc_copy_expr (code->expr2);
7890 /* assoc->variable will be set by resolve_assoc_var. */
7892 code->ext.block.assoc = assoc;
7893 code->expr1->symtree->n.sym->assoc = assoc;
7895 resolve_assoc_var (code->expr1->symtree->n.sym, false);
7898 code->ext.block.assoc = NULL;
7900 /* Add EXEC_SELECT to switch on type. */
7901 new_st = gfc_get_code ();
7902 new_st->op = code->op;
7903 new_st->expr1 = code->expr1;
7904 new_st->expr2 = code->expr2;
7905 new_st->block = code->block;
7906 code->expr1 = code->expr2 = NULL;
7911 ns->code->next = new_st;
7913 code->op = EXEC_SELECT;
7914 gfc_add_vptr_component (code->expr1);
7915 gfc_add_hash_component (code->expr1);
7917 /* Loop over TYPE IS / CLASS IS cases. */
7918 for (body = code->block; body; body = body->block)
7920 c = body->ext.block.case_list;
7922 if (c->ts.type == BT_DERIVED)
7923 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7924 c->ts.u.derived->hash_value);
7926 else if (c->ts.type == BT_UNKNOWN)
7929 /* Associate temporary to selector. This should only be done
7930 when this case is actually true, so build a new ASSOCIATE
7931 that does precisely this here (instead of using the
7934 if (c->ts.type == BT_CLASS)
7935 sprintf (name, "__tmp_class_%s", c->ts.u.derived->name);
7937 sprintf (name, "__tmp_type_%s", c->ts.u.derived->name);
7938 st = gfc_find_symtree (ns->sym_root, name);
7939 gcc_assert (st->n.sym->assoc);
7940 st->n.sym->assoc->target = gfc_get_variable_expr (code->expr1->symtree);
7941 if (c->ts.type == BT_DERIVED)
7942 gfc_add_data_component (st->n.sym->assoc->target);
7944 new_st = gfc_get_code ();
7945 new_st->op = EXEC_BLOCK;
7946 new_st->ext.block.ns = gfc_build_block_ns (ns);
7947 new_st->ext.block.ns->code = body->next;
7948 body->next = new_st;
7950 /* Chain in the new list only if it is marked as dangling. Otherwise
7951 there is a CASE label overlap and this is already used. Just ignore,
7952 the error is diagonsed elsewhere. */
7953 if (st->n.sym->assoc->dangling)
7955 new_st->ext.block.assoc = st->n.sym->assoc;
7956 st->n.sym->assoc->dangling = 0;
7959 resolve_assoc_var (st->n.sym, false);
7962 /* Take out CLASS IS cases for separate treatment. */
7964 while (body && body->block)
7966 if (body->block->ext.block.case_list->ts.type == BT_CLASS)
7968 /* Add to class_is list. */
7969 if (class_is == NULL)
7971 class_is = body->block;
7976 for (tail = class_is; tail->block; tail = tail->block) ;
7977 tail->block = body->block;
7980 /* Remove from EXEC_SELECT list. */
7981 body->block = body->block->block;
7994 /* Add a default case to hold the CLASS IS cases. */
7995 for (tail = code; tail->block; tail = tail->block) ;
7996 tail->block = gfc_get_code ();
7998 tail->op = EXEC_SELECT_TYPE;
7999 tail->ext.block.case_list = gfc_get_case ();
8000 tail->ext.block.case_list->ts.type = BT_UNKNOWN;
8002 default_case = tail;
8005 /* More than one CLASS IS block? */
8006 if (class_is->block)
8010 /* Sort CLASS IS blocks by extension level. */
8014 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
8017 /* F03:C817 (check for doubles). */
8018 if ((*c1)->ext.block.case_list->ts.u.derived->hash_value
8019 == c2->ext.block.case_list->ts.u.derived->hash_value)
8021 gfc_error ("Double CLASS IS block in SELECT TYPE "
8023 &c2->ext.block.case_list->where);
8026 if ((*c1)->ext.block.case_list->ts.u.derived->attr.extension
8027 < c2->ext.block.case_list->ts.u.derived->attr.extension)
8030 (*c1)->block = c2->block;
8040 /* Generate IF chain. */
8041 if_st = gfc_get_code ();
8042 if_st->op = EXEC_IF;
8044 for (body = class_is; body; body = body->block)
8046 new_st->block = gfc_get_code ();
8047 new_st = new_st->block;
8048 new_st->op = EXEC_IF;
8049 /* Set up IF condition: Call _gfortran_is_extension_of. */
8050 new_st->expr1 = gfc_get_expr ();
8051 new_st->expr1->expr_type = EXPR_FUNCTION;
8052 new_st->expr1->ts.type = BT_LOGICAL;
8053 new_st->expr1->ts.kind = 4;
8054 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
8055 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
8056 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
8057 /* Set up arguments. */
8058 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
8059 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
8060 new_st->expr1->value.function.actual->expr->where = code->loc;
8061 gfc_add_vptr_component (new_st->expr1->value.function.actual->expr);
8062 vtab = gfc_find_derived_vtab (body->ext.block.case_list->ts.u.derived);
8063 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
8064 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
8065 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
8066 new_st->next = body->next;
8068 if (default_case->next)
8070 new_st->block = gfc_get_code ();
8071 new_st = new_st->block;
8072 new_st->op = EXEC_IF;
8073 new_st->next = default_case->next;
8076 /* Replace CLASS DEFAULT code by the IF chain. */
8077 default_case->next = if_st;
8080 /* Resolve the internal code. This can not be done earlier because
8081 it requires that the sym->assoc of selectors is set already. */
8082 gfc_current_ns = ns;
8083 gfc_resolve_blocks (code->block, gfc_current_ns);
8084 gfc_current_ns = old_ns;
8086 resolve_select (code);
8090 /* Resolve a transfer statement. This is making sure that:
8091 -- a derived type being transferred has only non-pointer components
8092 -- a derived type being transferred doesn't have private components, unless
8093 it's being transferred from the module where the type was defined
8094 -- we're not trying to transfer a whole assumed size array. */
8097 resolve_transfer (gfc_code *code)
8106 while (exp != NULL && exp->expr_type == EXPR_OP
8107 && exp->value.op.op == INTRINSIC_PARENTHESES)
8108 exp = exp->value.op.op1;
8110 if (exp == NULL || (exp->expr_type != EXPR_VARIABLE
8111 && exp->expr_type != EXPR_FUNCTION))
8114 /* If we are reading, the variable will be changed. Note that
8115 code->ext.dt may be NULL if the TRANSFER is related to
8116 an INQUIRE statement -- but in this case, we are not reading, either. */
8117 if (code->ext.dt && code->ext.dt->dt_io_kind->value.iokind == M_READ
8118 && gfc_check_vardef_context (exp, false, false, _("item in READ"))
8122 sym = exp->symtree->n.sym;
8125 /* Go to actual component transferred. */
8126 for (ref = exp->ref; ref; ref = ref->next)
8127 if (ref->type == REF_COMPONENT)
8128 ts = &ref->u.c.component->ts;
8130 if (ts->type == BT_CLASS)
8132 /* FIXME: Test for defined input/output. */
8133 gfc_error ("Data transfer element at %L cannot be polymorphic unless "
8134 "it is processed by a defined input/output procedure",
8139 if (ts->type == BT_DERIVED)
8141 /* Check that transferred derived type doesn't contain POINTER
8143 if (ts->u.derived->attr.pointer_comp)
8145 gfc_error ("Data transfer element at %L cannot have POINTER "
8146 "components unless it is processed by a defined "
8147 "input/output procedure", &code->loc);
8152 if (ts->u.derived->attr.proc_pointer_comp)
8154 gfc_error ("Data transfer element at %L cannot have "
8155 "procedure pointer components", &code->loc);
8159 if (ts->u.derived->attr.alloc_comp)
8161 gfc_error ("Data transfer element at %L cannot have ALLOCATABLE "
8162 "components unless it is processed by a defined "
8163 "input/output procedure", &code->loc);
8167 if (derived_inaccessible (ts->u.derived))
8169 gfc_error ("Data transfer element at %L cannot have "
8170 "PRIVATE components",&code->loc);
8175 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
8176 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
8178 gfc_error ("Data transfer element at %L cannot be a full reference to "
8179 "an assumed-size array", &code->loc);
8185 /*********** Toplevel code resolution subroutines ***********/
8187 /* Find the set of labels that are reachable from this block. We also
8188 record the last statement in each block. */
8191 find_reachable_labels (gfc_code *block)
8198 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
8200 /* Collect labels in this block. We don't keep those corresponding
8201 to END {IF|SELECT}, these are checked in resolve_branch by going
8202 up through the code_stack. */
8203 for (c = block; c; c = c->next)
8205 if (c->here && c->op != EXEC_END_BLOCK)
8206 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
8209 /* Merge with labels from parent block. */
8212 gcc_assert (cs_base->prev->reachable_labels);
8213 bitmap_ior_into (cs_base->reachable_labels,
8214 cs_base->prev->reachable_labels);
8220 resolve_lock_unlock (gfc_code *code)
8222 if (code->expr1->ts.type != BT_DERIVED
8223 || code->expr1->expr_type != EXPR_VARIABLE
8224 || code->expr1->ts.u.derived->from_intmod != INTMOD_ISO_FORTRAN_ENV
8225 || code->expr1->ts.u.derived->intmod_sym_id != ISOFORTRAN_LOCK_TYPE
8226 || code->expr1->rank != 0
8227 || !(gfc_expr_attr (code->expr1).codimension
8228 || gfc_is_coindexed (code->expr1)))
8229 gfc_error ("Lock variable at %L must be a scalar coarray of type "
8230 "LOCK_TYPE", &code->expr1->where);
8234 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8235 || code->expr2->expr_type != EXPR_VARIABLE))
8236 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8237 &code->expr2->where);
8240 && gfc_check_vardef_context (code->expr2, false, false,
8241 _("STAT variable")) == FAILURE)
8246 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8247 || code->expr3->expr_type != EXPR_VARIABLE))
8248 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8249 &code->expr3->where);
8252 && gfc_check_vardef_context (code->expr3, false, false,
8253 _("ERRMSG variable")) == FAILURE)
8256 /* Check ACQUIRED_LOCK. */
8258 && (code->expr4->ts.type != BT_LOGICAL || code->expr4->rank != 0
8259 || code->expr4->expr_type != EXPR_VARIABLE))
8260 gfc_error ("ACQUIRED_LOCK= argument at %L must be a scalar LOGICAL "
8261 "variable", &code->expr4->where);
8264 && gfc_check_vardef_context (code->expr4, false, false,
8265 _("ACQUIRED_LOCK variable")) == FAILURE)
8271 resolve_sync (gfc_code *code)
8273 /* Check imageset. The * case matches expr1 == NULL. */
8276 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
8277 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
8278 "INTEGER expression", &code->expr1->where);
8279 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
8280 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
8281 gfc_error ("Imageset argument at %L must between 1 and num_images()",
8282 &code->expr1->where);
8283 else if (code->expr1->expr_type == EXPR_ARRAY
8284 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
8286 gfc_constructor *cons;
8287 cons = gfc_constructor_first (code->expr1->value.constructor);
8288 for (; cons; cons = gfc_constructor_next (cons))
8289 if (cons->expr->expr_type == EXPR_CONSTANT
8290 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
8291 gfc_error ("Imageset argument at %L must between 1 and "
8292 "num_images()", &cons->expr->where);
8298 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8299 || code->expr2->expr_type != EXPR_VARIABLE))
8300 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8301 &code->expr2->where);
8305 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8306 || code->expr3->expr_type != EXPR_VARIABLE))
8307 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8308 &code->expr3->where);
8312 /* Given a branch to a label, see if the branch is conforming.
8313 The code node describes where the branch is located. */
8316 resolve_branch (gfc_st_label *label, gfc_code *code)
8323 /* Step one: is this a valid branching target? */
8325 if (label->defined == ST_LABEL_UNKNOWN)
8327 gfc_error ("Label %d referenced at %L is never defined", label->value,
8332 if (label->defined != ST_LABEL_TARGET)
8334 gfc_error ("Statement at %L is not a valid branch target statement "
8335 "for the branch statement at %L", &label->where, &code->loc);
8339 /* Step two: make sure this branch is not a branch to itself ;-) */
8341 if (code->here == label)
8343 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
8347 /* Step three: See if the label is in the same block as the
8348 branching statement. The hard work has been done by setting up
8349 the bitmap reachable_labels. */
8351 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
8353 /* Check now whether there is a CRITICAL construct; if so, check
8354 whether the label is still visible outside of the CRITICAL block,
8355 which is invalid. */
8356 for (stack = cs_base; stack; stack = stack->prev)
8357 if (stack->current->op == EXEC_CRITICAL
8358 && bitmap_bit_p (stack->reachable_labels, label->value))
8359 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8360 " at %L", &code->loc, &label->where);
8365 /* Step four: If we haven't found the label in the bitmap, it may
8366 still be the label of the END of the enclosing block, in which
8367 case we find it by going up the code_stack. */
8369 for (stack = cs_base; stack; stack = stack->prev)
8371 if (stack->current->next && stack->current->next->here == label)
8373 if (stack->current->op == EXEC_CRITICAL)
8375 /* Note: A label at END CRITICAL does not leave the CRITICAL
8376 construct as END CRITICAL is still part of it. */
8377 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8378 " at %L", &code->loc, &label->where);
8385 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
8389 /* The label is not in an enclosing block, so illegal. This was
8390 allowed in Fortran 66, so we allow it as extension. No
8391 further checks are necessary in this case. */
8392 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
8393 "as the GOTO statement at %L", &label->where,
8399 /* Check whether EXPR1 has the same shape as EXPR2. */
8402 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
8404 mpz_t shape[GFC_MAX_DIMENSIONS];
8405 mpz_t shape2[GFC_MAX_DIMENSIONS];
8406 gfc_try result = FAILURE;
8409 /* Compare the rank. */
8410 if (expr1->rank != expr2->rank)
8413 /* Compare the size of each dimension. */
8414 for (i=0; i<expr1->rank; i++)
8416 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
8419 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
8422 if (mpz_cmp (shape[i], shape2[i]))
8426 /* When either of the two expression is an assumed size array, we
8427 ignore the comparison of dimension sizes. */
8432 for (i--; i >= 0; i--)
8434 mpz_clear (shape[i]);
8435 mpz_clear (shape2[i]);
8441 /* Check whether a WHERE assignment target or a WHERE mask expression
8442 has the same shape as the outmost WHERE mask expression. */
8445 resolve_where (gfc_code *code, gfc_expr *mask)
8451 cblock = code->block;
8453 /* Store the first WHERE mask-expr of the WHERE statement or construct.
8454 In case of nested WHERE, only the outmost one is stored. */
8455 if (mask == NULL) /* outmost WHERE */
8457 else /* inner WHERE */
8464 /* Check if the mask-expr has a consistent shape with the
8465 outmost WHERE mask-expr. */
8466 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
8467 gfc_error ("WHERE mask at %L has inconsistent shape",
8468 &cblock->expr1->where);
8471 /* the assignment statement of a WHERE statement, or the first
8472 statement in where-body-construct of a WHERE construct */
8473 cnext = cblock->next;
8478 /* WHERE assignment statement */
8481 /* Check shape consistent for WHERE assignment target. */
8482 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
8483 gfc_error ("WHERE assignment target at %L has "
8484 "inconsistent shape", &cnext->expr1->where);
8488 case EXEC_ASSIGN_CALL:
8489 resolve_call (cnext);
8490 if (!cnext->resolved_sym->attr.elemental)
8491 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8492 &cnext->ext.actual->expr->where);
8495 /* WHERE or WHERE construct is part of a where-body-construct */
8497 resolve_where (cnext, e);
8501 gfc_error ("Unsupported statement inside WHERE at %L",
8504 /* the next statement within the same where-body-construct */
8505 cnext = cnext->next;
8507 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8508 cblock = cblock->block;
8513 /* Resolve assignment in FORALL construct.
8514 NVAR is the number of FORALL index variables, and VAR_EXPR records the
8515 FORALL index variables. */
8518 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
8522 for (n = 0; n < nvar; n++)
8524 gfc_symbol *forall_index;
8526 forall_index = var_expr[n]->symtree->n.sym;
8528 /* Check whether the assignment target is one of the FORALL index
8530 if ((code->expr1->expr_type == EXPR_VARIABLE)
8531 && (code->expr1->symtree->n.sym == forall_index))
8532 gfc_error ("Assignment to a FORALL index variable at %L",
8533 &code->expr1->where);
8536 /* If one of the FORALL index variables doesn't appear in the
8537 assignment variable, then there could be a many-to-one
8538 assignment. Emit a warning rather than an error because the
8539 mask could be resolving this problem. */
8540 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
8541 gfc_warning ("The FORALL with index '%s' is not used on the "
8542 "left side of the assignment at %L and so might "
8543 "cause multiple assignment to this object",
8544 var_expr[n]->symtree->name, &code->expr1->where);
8550 /* Resolve WHERE statement in FORALL construct. */
8553 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
8554 gfc_expr **var_expr)
8559 cblock = code->block;
8562 /* the assignment statement of a WHERE statement, or the first
8563 statement in where-body-construct of a WHERE construct */
8564 cnext = cblock->next;
8569 /* WHERE assignment statement */
8571 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
8574 /* WHERE operator assignment statement */
8575 case EXEC_ASSIGN_CALL:
8576 resolve_call (cnext);
8577 if (!cnext->resolved_sym->attr.elemental)
8578 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8579 &cnext->ext.actual->expr->where);
8582 /* WHERE or WHERE construct is part of a where-body-construct */
8584 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
8588 gfc_error ("Unsupported statement inside WHERE at %L",
8591 /* the next statement within the same where-body-construct */
8592 cnext = cnext->next;
8594 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8595 cblock = cblock->block;
8600 /* Traverse the FORALL body to check whether the following errors exist:
8601 1. For assignment, check if a many-to-one assignment happens.
8602 2. For WHERE statement, check the WHERE body to see if there is any
8603 many-to-one assignment. */
8606 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8610 c = code->block->next;
8616 case EXEC_POINTER_ASSIGN:
8617 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8620 case EXEC_ASSIGN_CALL:
8624 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8625 there is no need to handle it here. */
8629 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8634 /* The next statement in the FORALL body. */
8640 /* Counts the number of iterators needed inside a forall construct, including
8641 nested forall constructs. This is used to allocate the needed memory
8642 in gfc_resolve_forall. */
8645 gfc_count_forall_iterators (gfc_code *code)
8647 int max_iters, sub_iters, current_iters;
8648 gfc_forall_iterator *fa;
8650 gcc_assert(code->op == EXEC_FORALL);
8654 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8657 code = code->block->next;
8661 if (code->op == EXEC_FORALL)
8663 sub_iters = gfc_count_forall_iterators (code);
8664 if (sub_iters > max_iters)
8665 max_iters = sub_iters;
8670 return current_iters + max_iters;
8674 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8675 gfc_resolve_forall_body to resolve the FORALL body. */
8678 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8680 static gfc_expr **var_expr;
8681 static int total_var = 0;
8682 static int nvar = 0;
8684 gfc_forall_iterator *fa;
8689 /* Start to resolve a FORALL construct */
8690 if (forall_save == 0)
8692 /* Count the total number of FORALL index in the nested FORALL
8693 construct in order to allocate the VAR_EXPR with proper size. */
8694 total_var = gfc_count_forall_iterators (code);
8696 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8697 var_expr = XCNEWVEC (gfc_expr *, total_var);
8700 /* The information about FORALL iterator, including FORALL index start, end
8701 and stride. The FORALL index can not appear in start, end or stride. */
8702 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8704 /* Check if any outer FORALL index name is the same as the current
8706 for (i = 0; i < nvar; i++)
8708 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8710 gfc_error ("An outer FORALL construct already has an index "
8711 "with this name %L", &fa->var->where);
8715 /* Record the current FORALL index. */
8716 var_expr[nvar] = gfc_copy_expr (fa->var);
8720 /* No memory leak. */
8721 gcc_assert (nvar <= total_var);
8724 /* Resolve the FORALL body. */
8725 gfc_resolve_forall_body (code, nvar, var_expr);
8727 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8728 gfc_resolve_blocks (code->block, ns);
8732 /* Free only the VAR_EXPRs allocated in this frame. */
8733 for (i = nvar; i < tmp; i++)
8734 gfc_free_expr (var_expr[i]);
8738 /* We are in the outermost FORALL construct. */
8739 gcc_assert (forall_save == 0);
8741 /* VAR_EXPR is not needed any more. */
8748 /* Resolve a BLOCK construct statement. */
8751 resolve_block_construct (gfc_code* code)
8753 /* Resolve the BLOCK's namespace. */
8754 gfc_resolve (code->ext.block.ns);
8756 /* For an ASSOCIATE block, the associations (and their targets) are already
8757 resolved during resolve_symbol. */
8761 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8764 static void resolve_code (gfc_code *, gfc_namespace *);
8767 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8771 for (; b; b = b->block)
8773 t = gfc_resolve_expr (b->expr1);
8774 if (gfc_resolve_expr (b->expr2) == FAILURE)
8780 if (t == SUCCESS && b->expr1 != NULL
8781 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8782 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8789 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8790 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8795 resolve_branch (b->label1, b);
8799 resolve_block_construct (b);
8803 case EXEC_SELECT_TYPE:
8814 case EXEC_OMP_ATOMIC:
8815 case EXEC_OMP_CRITICAL:
8817 case EXEC_OMP_MASTER:
8818 case EXEC_OMP_ORDERED:
8819 case EXEC_OMP_PARALLEL:
8820 case EXEC_OMP_PARALLEL_DO:
8821 case EXEC_OMP_PARALLEL_SECTIONS:
8822 case EXEC_OMP_PARALLEL_WORKSHARE:
8823 case EXEC_OMP_SECTIONS:
8824 case EXEC_OMP_SINGLE:
8826 case EXEC_OMP_TASKWAIT:
8827 case EXEC_OMP_TASKYIELD:
8828 case EXEC_OMP_WORKSHARE:
8832 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8835 resolve_code (b->next, ns);
8840 /* Does everything to resolve an ordinary assignment. Returns true
8841 if this is an interface assignment. */
8843 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8853 if (gfc_extend_assign (code, ns) == SUCCESS)
8857 if (code->op == EXEC_ASSIGN_CALL)
8859 lhs = code->ext.actual->expr;
8860 rhsptr = &code->ext.actual->next->expr;
8864 gfc_actual_arglist* args;
8865 gfc_typebound_proc* tbp;
8867 gcc_assert (code->op == EXEC_COMPCALL);
8869 args = code->expr1->value.compcall.actual;
8871 rhsptr = &args->next->expr;
8873 tbp = code->expr1->value.compcall.tbp;
8874 gcc_assert (!tbp->is_generic);
8877 /* Make a temporary rhs when there is a default initializer
8878 and rhs is the same symbol as the lhs. */
8879 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8880 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8881 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8882 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8883 *rhsptr = gfc_get_parentheses (*rhsptr);
8892 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8893 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8894 &code->loc) == FAILURE)
8897 /* Handle the case of a BOZ literal on the RHS. */
8898 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8901 if (gfc_option.warn_surprising)
8902 gfc_warning ("BOZ literal at %L is bitwise transferred "
8903 "non-integer symbol '%s'", &code->loc,
8904 lhs->symtree->n.sym->name);
8906 if (!gfc_convert_boz (rhs, &lhs->ts))
8908 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8910 if (rc == ARITH_UNDERFLOW)
8911 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8912 ". This check can be disabled with the option "
8913 "-fno-range-check", &rhs->where);
8914 else if (rc == ARITH_OVERFLOW)
8915 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8916 ". This check can be disabled with the option "
8917 "-fno-range-check", &rhs->where);
8918 else if (rc == ARITH_NAN)
8919 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8920 ". This check can be disabled with the option "
8921 "-fno-range-check", &rhs->where);
8926 if (lhs->ts.type == BT_CHARACTER
8927 && gfc_option.warn_character_truncation)
8929 if (lhs->ts.u.cl != NULL
8930 && lhs->ts.u.cl->length != NULL
8931 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8932 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8934 if (rhs->expr_type == EXPR_CONSTANT)
8935 rlen = rhs->value.character.length;
8937 else if (rhs->ts.u.cl != NULL
8938 && rhs->ts.u.cl->length != NULL
8939 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8940 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8942 if (rlen && llen && rlen > llen)
8943 gfc_warning_now ("CHARACTER expression will be truncated "
8944 "in assignment (%d/%d) at %L",
8945 llen, rlen, &code->loc);
8948 /* Ensure that a vector index expression for the lvalue is evaluated
8949 to a temporary if the lvalue symbol is referenced in it. */
8952 for (ref = lhs->ref; ref; ref= ref->next)
8953 if (ref->type == REF_ARRAY)
8955 for (n = 0; n < ref->u.ar.dimen; n++)
8956 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8957 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8958 ref->u.ar.start[n]))
8960 = gfc_get_parentheses (ref->u.ar.start[n]);
8964 if (gfc_pure (NULL))
8966 if (lhs->ts.type == BT_DERIVED
8967 && lhs->expr_type == EXPR_VARIABLE
8968 && lhs->ts.u.derived->attr.pointer_comp
8969 && rhs->expr_type == EXPR_VARIABLE
8970 && (gfc_impure_variable (rhs->symtree->n.sym)
8971 || gfc_is_coindexed (rhs)))
8974 if (gfc_is_coindexed (rhs))
8975 gfc_error ("Coindexed expression at %L is assigned to "
8976 "a derived type variable with a POINTER "
8977 "component in a PURE procedure",
8980 gfc_error ("The impure variable at %L is assigned to "
8981 "a derived type variable with a POINTER "
8982 "component in a PURE procedure (12.6)",
8987 /* Fortran 2008, C1283. */
8988 if (gfc_is_coindexed (lhs))
8990 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8991 "procedure", &rhs->where);
8996 if (gfc_implicit_pure (NULL))
8998 if (lhs->expr_type == EXPR_VARIABLE
8999 && lhs->symtree->n.sym != gfc_current_ns->proc_name
9000 && lhs->symtree->n.sym->ns != gfc_current_ns)
9001 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9003 if (lhs->ts.type == BT_DERIVED
9004 && lhs->expr_type == EXPR_VARIABLE
9005 && lhs->ts.u.derived->attr.pointer_comp
9006 && rhs->expr_type == EXPR_VARIABLE
9007 && (gfc_impure_variable (rhs->symtree->n.sym)
9008 || gfc_is_coindexed (rhs)))
9009 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9011 /* Fortran 2008, C1283. */
9012 if (gfc_is_coindexed (lhs))
9013 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9017 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
9018 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
9019 if (lhs->ts.type == BT_CLASS)
9021 gfc_error ("Variable must not be polymorphic in assignment at %L",
9026 /* F2008, Section 7.2.1.2. */
9027 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
9029 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
9030 "component in assignment at %L", &lhs->where);
9034 gfc_check_assign (lhs, rhs, 1);
9039 /* Given a block of code, recursively resolve everything pointed to by this
9043 resolve_code (gfc_code *code, gfc_namespace *ns)
9045 int omp_workshare_save;
9050 frame.prev = cs_base;
9054 find_reachable_labels (code);
9056 for (; code; code = code->next)
9058 frame.current = code;
9059 forall_save = forall_flag;
9061 if (code->op == EXEC_FORALL)
9064 gfc_resolve_forall (code, ns, forall_save);
9067 else if (code->block)
9069 omp_workshare_save = -1;
9072 case EXEC_OMP_PARALLEL_WORKSHARE:
9073 omp_workshare_save = omp_workshare_flag;
9074 omp_workshare_flag = 1;
9075 gfc_resolve_omp_parallel_blocks (code, ns);
9077 case EXEC_OMP_PARALLEL:
9078 case EXEC_OMP_PARALLEL_DO:
9079 case EXEC_OMP_PARALLEL_SECTIONS:
9081 omp_workshare_save = omp_workshare_flag;
9082 omp_workshare_flag = 0;
9083 gfc_resolve_omp_parallel_blocks (code, ns);
9086 gfc_resolve_omp_do_blocks (code, ns);
9088 case EXEC_SELECT_TYPE:
9089 /* Blocks are handled in resolve_select_type because we have
9090 to transform the SELECT TYPE into ASSOCIATE first. */
9092 case EXEC_OMP_WORKSHARE:
9093 omp_workshare_save = omp_workshare_flag;
9094 omp_workshare_flag = 1;
9097 gfc_resolve_blocks (code->block, ns);
9101 if (omp_workshare_save != -1)
9102 omp_workshare_flag = omp_workshare_save;
9106 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
9107 t = gfc_resolve_expr (code->expr1);
9108 forall_flag = forall_save;
9110 if (gfc_resolve_expr (code->expr2) == FAILURE)
9113 if (code->op == EXEC_ALLOCATE
9114 && gfc_resolve_expr (code->expr3) == FAILURE)
9120 case EXEC_END_BLOCK:
9124 case EXEC_ERROR_STOP:
9128 case EXEC_ASSIGN_CALL:
9133 case EXEC_SYNC_IMAGES:
9134 case EXEC_SYNC_MEMORY:
9135 resolve_sync (code);
9140 resolve_lock_unlock (code);
9144 /* Keep track of which entry we are up to. */
9145 current_entry_id = code->ext.entry->id;
9149 resolve_where (code, NULL);
9153 if (code->expr1 != NULL)
9155 if (code->expr1->ts.type != BT_INTEGER)
9156 gfc_error ("ASSIGNED GOTO statement at %L requires an "
9157 "INTEGER variable", &code->expr1->where);
9158 else if (code->expr1->symtree->n.sym->attr.assign != 1)
9159 gfc_error ("Variable '%s' has not been assigned a target "
9160 "label at %L", code->expr1->symtree->n.sym->name,
9161 &code->expr1->where);
9164 resolve_branch (code->label1, code);
9168 if (code->expr1 != NULL
9169 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
9170 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
9171 "INTEGER return specifier", &code->expr1->where);
9174 case EXEC_INIT_ASSIGN:
9175 case EXEC_END_PROCEDURE:
9182 if (gfc_check_vardef_context (code->expr1, false, false,
9183 _("assignment")) == FAILURE)
9186 if (resolve_ordinary_assign (code, ns))
9188 if (code->op == EXEC_COMPCALL)
9195 case EXEC_LABEL_ASSIGN:
9196 if (code->label1->defined == ST_LABEL_UNKNOWN)
9197 gfc_error ("Label %d referenced at %L is never defined",
9198 code->label1->value, &code->label1->where);
9200 && (code->expr1->expr_type != EXPR_VARIABLE
9201 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
9202 || code->expr1->symtree->n.sym->ts.kind
9203 != gfc_default_integer_kind
9204 || code->expr1->symtree->n.sym->as != NULL))
9205 gfc_error ("ASSIGN statement at %L requires a scalar "
9206 "default INTEGER variable", &code->expr1->where);
9209 case EXEC_POINTER_ASSIGN:
9216 /* This is both a variable definition and pointer assignment
9217 context, so check both of them. For rank remapping, a final
9218 array ref may be present on the LHS and fool gfc_expr_attr
9219 used in gfc_check_vardef_context. Remove it. */
9220 e = remove_last_array_ref (code->expr1);
9221 t = gfc_check_vardef_context (e, true, false,
9222 _("pointer assignment"));
9224 t = gfc_check_vardef_context (e, false, false,
9225 _("pointer assignment"));
9230 gfc_check_pointer_assign (code->expr1, code->expr2);
9234 case EXEC_ARITHMETIC_IF:
9236 && code->expr1->ts.type != BT_INTEGER
9237 && code->expr1->ts.type != BT_REAL)
9238 gfc_error ("Arithmetic IF statement at %L requires a numeric "
9239 "expression", &code->expr1->where);
9241 resolve_branch (code->label1, code);
9242 resolve_branch (code->label2, code);
9243 resolve_branch (code->label3, code);
9247 if (t == SUCCESS && code->expr1 != NULL
9248 && (code->expr1->ts.type != BT_LOGICAL
9249 || code->expr1->rank != 0))
9250 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
9251 &code->expr1->where);
9256 resolve_call (code);
9261 resolve_typebound_subroutine (code);
9265 resolve_ppc_call (code);
9269 /* Select is complicated. Also, a SELECT construct could be
9270 a transformed computed GOTO. */
9271 resolve_select (code);
9274 case EXEC_SELECT_TYPE:
9275 resolve_select_type (code, ns);
9279 resolve_block_construct (code);
9283 if (code->ext.iterator != NULL)
9285 gfc_iterator *iter = code->ext.iterator;
9286 if (gfc_resolve_iterator (iter, true) != FAILURE)
9287 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
9292 if (code->expr1 == NULL)
9293 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
9295 && (code->expr1->rank != 0
9296 || code->expr1->ts.type != BT_LOGICAL))
9297 gfc_error ("Exit condition of DO WHILE loop at %L must be "
9298 "a scalar LOGICAL expression", &code->expr1->where);
9303 resolve_allocate_deallocate (code, "ALLOCATE");
9307 case EXEC_DEALLOCATE:
9309 resolve_allocate_deallocate (code, "DEALLOCATE");
9314 if (gfc_resolve_open (code->ext.open) == FAILURE)
9317 resolve_branch (code->ext.open->err, code);
9321 if (gfc_resolve_close (code->ext.close) == FAILURE)
9324 resolve_branch (code->ext.close->err, code);
9327 case EXEC_BACKSPACE:
9331 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
9334 resolve_branch (code->ext.filepos->err, code);
9338 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9341 resolve_branch (code->ext.inquire->err, code);
9345 gcc_assert (code->ext.inquire != NULL);
9346 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9349 resolve_branch (code->ext.inquire->err, code);
9353 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
9356 resolve_branch (code->ext.wait->err, code);
9357 resolve_branch (code->ext.wait->end, code);
9358 resolve_branch (code->ext.wait->eor, code);
9363 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
9366 resolve_branch (code->ext.dt->err, code);
9367 resolve_branch (code->ext.dt->end, code);
9368 resolve_branch (code->ext.dt->eor, code);
9372 resolve_transfer (code);
9376 resolve_forall_iterators (code->ext.forall_iterator);
9378 if (code->expr1 != NULL
9379 && (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank))
9380 gfc_error ("FORALL mask clause at %L requires a scalar LOGICAL "
9381 "expression", &code->expr1->where);
9384 case EXEC_OMP_ATOMIC:
9385 case EXEC_OMP_BARRIER:
9386 case EXEC_OMP_CRITICAL:
9387 case EXEC_OMP_FLUSH:
9389 case EXEC_OMP_MASTER:
9390 case EXEC_OMP_ORDERED:
9391 case EXEC_OMP_SECTIONS:
9392 case EXEC_OMP_SINGLE:
9393 case EXEC_OMP_TASKWAIT:
9394 case EXEC_OMP_TASKYIELD:
9395 case EXEC_OMP_WORKSHARE:
9396 gfc_resolve_omp_directive (code, ns);
9399 case EXEC_OMP_PARALLEL:
9400 case EXEC_OMP_PARALLEL_DO:
9401 case EXEC_OMP_PARALLEL_SECTIONS:
9402 case EXEC_OMP_PARALLEL_WORKSHARE:
9404 omp_workshare_save = omp_workshare_flag;
9405 omp_workshare_flag = 0;
9406 gfc_resolve_omp_directive (code, ns);
9407 omp_workshare_flag = omp_workshare_save;
9411 gfc_internal_error ("resolve_code(): Bad statement code");
9415 cs_base = frame.prev;
9419 /* Resolve initial values and make sure they are compatible with
9423 resolve_values (gfc_symbol *sym)
9427 if (sym->value == NULL)
9430 if (sym->value->expr_type == EXPR_STRUCTURE)
9431 t= resolve_structure_cons (sym->value, 1);
9433 t = gfc_resolve_expr (sym->value);
9438 gfc_check_assign_symbol (sym, sym->value);
9442 /* Verify the binding labels for common blocks that are BIND(C). The label
9443 for a BIND(C) common block must be identical in all scoping units in which
9444 the common block is declared. Further, the binding label can not collide
9445 with any other global entity in the program. */
9448 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
9450 if (comm_block_tree->n.common->is_bind_c == 1)
9452 gfc_gsymbol *binding_label_gsym;
9453 gfc_gsymbol *comm_name_gsym;
9455 /* See if a global symbol exists by the common block's name. It may
9456 be NULL if the common block is use-associated. */
9457 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
9458 comm_block_tree->n.common->name);
9459 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
9460 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
9461 "with the global entity '%s' at %L",
9462 comm_block_tree->n.common->binding_label,
9463 comm_block_tree->n.common->name,
9464 &(comm_block_tree->n.common->where),
9465 comm_name_gsym->name, &(comm_name_gsym->where));
9466 else if (comm_name_gsym != NULL
9467 && strcmp (comm_name_gsym->name,
9468 comm_block_tree->n.common->name) == 0)
9470 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
9472 if (comm_name_gsym->binding_label == NULL)
9473 /* No binding label for common block stored yet; save this one. */
9474 comm_name_gsym->binding_label =
9475 comm_block_tree->n.common->binding_label;
9477 if (strcmp (comm_name_gsym->binding_label,
9478 comm_block_tree->n.common->binding_label) != 0)
9480 /* Common block names match but binding labels do not. */
9481 gfc_error ("Binding label '%s' for common block '%s' at %L "
9482 "does not match the binding label '%s' for common "
9484 comm_block_tree->n.common->binding_label,
9485 comm_block_tree->n.common->name,
9486 &(comm_block_tree->n.common->where),
9487 comm_name_gsym->binding_label,
9488 comm_name_gsym->name,
9489 &(comm_name_gsym->where));
9494 /* There is no binding label (NAME="") so we have nothing further to
9495 check and nothing to add as a global symbol for the label. */
9496 if (comm_block_tree->n.common->binding_label[0] == '\0' )
9499 binding_label_gsym =
9500 gfc_find_gsymbol (gfc_gsym_root,
9501 comm_block_tree->n.common->binding_label);
9502 if (binding_label_gsym == NULL)
9504 /* Need to make a global symbol for the binding label to prevent
9505 it from colliding with another. */
9506 binding_label_gsym =
9507 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
9508 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
9509 binding_label_gsym->type = GSYM_COMMON;
9513 /* If comm_name_gsym is NULL, the name common block is use
9514 associated and the name could be colliding. */
9515 if (binding_label_gsym->type != GSYM_COMMON)
9516 gfc_error ("Binding label '%s' for common block '%s' at %L "
9517 "collides with the global entity '%s' at %L",
9518 comm_block_tree->n.common->binding_label,
9519 comm_block_tree->n.common->name,
9520 &(comm_block_tree->n.common->where),
9521 binding_label_gsym->name,
9522 &(binding_label_gsym->where));
9523 else if (comm_name_gsym != NULL
9524 && (strcmp (binding_label_gsym->name,
9525 comm_name_gsym->binding_label) != 0)
9526 && (strcmp (binding_label_gsym->sym_name,
9527 comm_name_gsym->name) != 0))
9528 gfc_error ("Binding label '%s' for common block '%s' at %L "
9529 "collides with global entity '%s' at %L",
9530 binding_label_gsym->name, binding_label_gsym->sym_name,
9531 &(comm_block_tree->n.common->where),
9532 comm_name_gsym->name, &(comm_name_gsym->where));
9540 /* Verify any BIND(C) derived types in the namespace so we can report errors
9541 for them once, rather than for each variable declared of that type. */
9544 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
9546 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
9547 && derived_sym->attr.is_bind_c == 1)
9548 verify_bind_c_derived_type (derived_sym);
9554 /* Verify that any binding labels used in a given namespace do not collide
9555 with the names or binding labels of any global symbols. */
9558 gfc_verify_binding_labels (gfc_symbol *sym)
9562 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
9563 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
9565 gfc_gsymbol *bind_c_sym;
9567 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
9568 if (bind_c_sym != NULL
9569 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
9571 if (sym->attr.if_source == IFSRC_DECL
9572 && (bind_c_sym->type != GSYM_SUBROUTINE
9573 && bind_c_sym->type != GSYM_FUNCTION)
9574 && ((sym->attr.contained == 1
9575 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
9576 || (sym->attr.use_assoc == 1
9577 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
9579 /* Make sure global procedures don't collide with anything. */
9580 gfc_error ("Binding label '%s' at %L collides with the global "
9581 "entity '%s' at %L", sym->binding_label,
9582 &(sym->declared_at), bind_c_sym->name,
9583 &(bind_c_sym->where));
9586 else if (sym->attr.contained == 0
9587 && (sym->attr.if_source == IFSRC_IFBODY
9588 && sym->attr.flavor == FL_PROCEDURE)
9589 && (bind_c_sym->sym_name != NULL
9590 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
9592 /* Make sure procedures in interface bodies don't collide. */
9593 gfc_error ("Binding label '%s' in interface body at %L collides "
9594 "with the global entity '%s' at %L",
9596 &(sym->declared_at), bind_c_sym->name,
9597 &(bind_c_sym->where));
9600 else if (sym->attr.contained == 0
9601 && sym->attr.if_source == IFSRC_UNKNOWN)
9602 if ((sym->attr.use_assoc && bind_c_sym->mod_name
9603 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
9604 || sym->attr.use_assoc == 0)
9606 gfc_error ("Binding label '%s' at %L collides with global "
9607 "entity '%s' at %L", sym->binding_label,
9608 &(sym->declared_at), bind_c_sym->name,
9609 &(bind_c_sym->where));
9614 /* Clear the binding label to prevent checking multiple times. */
9615 sym->binding_label[0] = '\0';
9617 else if (bind_c_sym == NULL)
9619 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
9620 bind_c_sym->where = sym->declared_at;
9621 bind_c_sym->sym_name = sym->name;
9623 if (sym->attr.use_assoc == 1)
9624 bind_c_sym->mod_name = sym->module;
9626 if (sym->ns->proc_name != NULL)
9627 bind_c_sym->mod_name = sym->ns->proc_name->name;
9629 if (sym->attr.contained == 0)
9631 if (sym->attr.subroutine)
9632 bind_c_sym->type = GSYM_SUBROUTINE;
9633 else if (sym->attr.function)
9634 bind_c_sym->type = GSYM_FUNCTION;
9642 /* Resolve an index expression. */
9645 resolve_index_expr (gfc_expr *e)
9647 if (gfc_resolve_expr (e) == FAILURE)
9650 if (gfc_simplify_expr (e, 0) == FAILURE)
9653 if (gfc_specification_expr (e) == FAILURE)
9660 /* Resolve a charlen structure. */
9663 resolve_charlen (gfc_charlen *cl)
9672 specification_expr = 1;
9674 if (resolve_index_expr (cl->length) == FAILURE)
9676 specification_expr = 0;
9680 /* "If the character length parameter value evaluates to a negative
9681 value, the length of character entities declared is zero." */
9682 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9684 if (gfc_option.warn_surprising)
9685 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9686 " the length has been set to zero",
9687 &cl->length->where, i);
9688 gfc_replace_expr (cl->length,
9689 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9692 /* Check that the character length is not too large. */
9693 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9694 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9695 && cl->length->ts.type == BT_INTEGER
9696 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9698 gfc_error ("String length at %L is too large", &cl->length->where);
9706 /* Test for non-constant shape arrays. */
9709 is_non_constant_shape_array (gfc_symbol *sym)
9715 not_constant = false;
9716 if (sym->as != NULL)
9718 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9719 has not been simplified; parameter array references. Do the
9720 simplification now. */
9721 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9723 e = sym->as->lower[i];
9724 if (e && (resolve_index_expr (e) == FAILURE
9725 || !gfc_is_constant_expr (e)))
9726 not_constant = true;
9727 e = sym->as->upper[i];
9728 if (e && (resolve_index_expr (e) == FAILURE
9729 || !gfc_is_constant_expr (e)))
9730 not_constant = true;
9733 return not_constant;
9736 /* Given a symbol and an initialization expression, add code to initialize
9737 the symbol to the function entry. */
9739 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9743 gfc_namespace *ns = sym->ns;
9745 /* Search for the function namespace if this is a contained
9746 function without an explicit result. */
9747 if (sym->attr.function && sym == sym->result
9748 && sym->name != sym->ns->proc_name->name)
9751 for (;ns; ns = ns->sibling)
9752 if (strcmp (ns->proc_name->name, sym->name) == 0)
9758 gfc_free_expr (init);
9762 /* Build an l-value expression for the result. */
9763 lval = gfc_lval_expr_from_sym (sym);
9765 /* Add the code at scope entry. */
9766 init_st = gfc_get_code ();
9767 init_st->next = ns->code;
9770 /* Assign the default initializer to the l-value. */
9771 init_st->loc = sym->declared_at;
9772 init_st->op = EXEC_INIT_ASSIGN;
9773 init_st->expr1 = lval;
9774 init_st->expr2 = init;
9777 /* Assign the default initializer to a derived type variable or result. */
9780 apply_default_init (gfc_symbol *sym)
9782 gfc_expr *init = NULL;
9784 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9787 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9788 init = gfc_default_initializer (&sym->ts);
9790 if (init == NULL && sym->ts.type != BT_CLASS)
9793 build_init_assign (sym, init);
9794 sym->attr.referenced = 1;
9797 /* Build an initializer for a local integer, real, complex, logical, or
9798 character variable, based on the command line flags finit-local-zero,
9799 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9800 null if the symbol should not have a default initialization. */
9802 build_default_init_expr (gfc_symbol *sym)
9805 gfc_expr *init_expr;
9808 /* These symbols should never have a default initialization. */
9809 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9810 || sym->attr.external
9812 || sym->attr.pointer
9813 || sym->attr.in_equivalence
9814 || sym->attr.in_common
9817 || sym->attr.cray_pointee
9818 || sym->attr.cray_pointer)
9821 /* Now we'll try to build an initializer expression. */
9822 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9825 /* We will only initialize integers, reals, complex, logicals, and
9826 characters, and only if the corresponding command-line flags
9827 were set. Otherwise, we free init_expr and return null. */
9828 switch (sym->ts.type)
9831 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9832 mpz_set_si (init_expr->value.integer,
9833 gfc_option.flag_init_integer_value);
9836 gfc_free_expr (init_expr);
9842 switch (gfc_option.flag_init_real)
9844 case GFC_INIT_REAL_SNAN:
9845 init_expr->is_snan = 1;
9847 case GFC_INIT_REAL_NAN:
9848 mpfr_set_nan (init_expr->value.real);
9851 case GFC_INIT_REAL_INF:
9852 mpfr_set_inf (init_expr->value.real, 1);
9855 case GFC_INIT_REAL_NEG_INF:
9856 mpfr_set_inf (init_expr->value.real, -1);
9859 case GFC_INIT_REAL_ZERO:
9860 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9864 gfc_free_expr (init_expr);
9871 switch (gfc_option.flag_init_real)
9873 case GFC_INIT_REAL_SNAN:
9874 init_expr->is_snan = 1;
9876 case GFC_INIT_REAL_NAN:
9877 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9878 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9881 case GFC_INIT_REAL_INF:
9882 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9883 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9886 case GFC_INIT_REAL_NEG_INF:
9887 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9888 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9891 case GFC_INIT_REAL_ZERO:
9892 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9896 gfc_free_expr (init_expr);
9903 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9904 init_expr->value.logical = 0;
9905 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9906 init_expr->value.logical = 1;
9909 gfc_free_expr (init_expr);
9915 /* For characters, the length must be constant in order to
9916 create a default initializer. */
9917 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9918 && sym->ts.u.cl->length
9919 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9921 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9922 init_expr->value.character.length = char_len;
9923 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9924 for (i = 0; i < char_len; i++)
9925 init_expr->value.character.string[i]
9926 = (unsigned char) gfc_option.flag_init_character_value;
9930 gfc_free_expr (init_expr);
9936 gfc_free_expr (init_expr);
9942 /* Add an initialization expression to a local variable. */
9944 apply_default_init_local (gfc_symbol *sym)
9946 gfc_expr *init = NULL;
9948 /* The symbol should be a variable or a function return value. */
9949 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9950 || (sym->attr.function && sym->result != sym))
9953 /* Try to build the initializer expression. If we can't initialize
9954 this symbol, then init will be NULL. */
9955 init = build_default_init_expr (sym);
9959 /* For saved variables, we don't want to add an initializer at
9960 function entry, so we just add a static initializer. */
9961 if (sym->attr.save || sym->ns->save_all
9962 || gfc_option.flag_max_stack_var_size == 0)
9964 /* Don't clobber an existing initializer! */
9965 gcc_assert (sym->value == NULL);
9970 build_init_assign (sym, init);
9974 /* Resolution of common features of flavors variable and procedure. */
9977 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9979 /* Avoid double diagnostics for function result symbols. */
9980 if ((sym->result || sym->attr.result) && !sym->attr.dummy
9981 && (sym->ns != gfc_current_ns))
9984 /* Constraints on deferred shape variable. */
9985 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9987 if (sym->attr.allocatable)
9989 if (sym->attr.dimension)
9991 gfc_error ("Allocatable array '%s' at %L must have "
9992 "a deferred shape", sym->name, &sym->declared_at);
9995 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9996 "may not be ALLOCATABLE", sym->name,
9997 &sym->declared_at) == FAILURE)
10001 if (sym->attr.pointer && sym->attr.dimension)
10003 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
10004 sym->name, &sym->declared_at);
10010 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
10011 && sym->ts.type != BT_CLASS && !sym->assoc)
10013 gfc_error ("Array '%s' at %L cannot have a deferred shape",
10014 sym->name, &sym->declared_at);
10019 /* Constraints on polymorphic variables. */
10020 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
10023 if (sym->attr.class_ok
10024 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
10026 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
10027 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
10028 &sym->declared_at);
10033 /* Assume that use associated symbols were checked in the module ns.
10034 Class-variables that are associate-names are also something special
10035 and excepted from the test. */
10036 if (!sym->attr.class_ok && !sym->attr.use_assoc && !sym->assoc)
10038 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
10039 "or pointer", sym->name, &sym->declared_at);
10048 /* Additional checks for symbols with flavor variable and derived
10049 type. To be called from resolve_fl_variable. */
10052 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
10054 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
10056 /* Check to see if a derived type is blocked from being host
10057 associated by the presence of another class I symbol in the same
10058 namespace. 14.6.1.3 of the standard and the discussion on
10059 comp.lang.fortran. */
10060 if (sym->ns != sym->ts.u.derived->ns
10061 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
10064 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
10065 if (s && s->attr.flavor != FL_DERIVED)
10067 gfc_error ("The type '%s' cannot be host associated at %L "
10068 "because it is blocked by an incompatible object "
10069 "of the same name declared at %L",
10070 sym->ts.u.derived->name, &sym->declared_at,
10076 /* 4th constraint in section 11.3: "If an object of a type for which
10077 component-initialization is specified (R429) appears in the
10078 specification-part of a module and does not have the ALLOCATABLE
10079 or POINTER attribute, the object shall have the SAVE attribute."
10081 The check for initializers is performed with
10082 gfc_has_default_initializer because gfc_default_initializer generates
10083 a hidden default for allocatable components. */
10084 if (!(sym->value || no_init_flag) && sym->ns->proc_name
10085 && sym->ns->proc_name->attr.flavor == FL_MODULE
10086 && !sym->ns->save_all && !sym->attr.save
10087 && !sym->attr.pointer && !sym->attr.allocatable
10088 && gfc_has_default_initializer (sym->ts.u.derived)
10089 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
10090 "module variable '%s' at %L, needed due to "
10091 "the default initialization", sym->name,
10092 &sym->declared_at) == FAILURE)
10095 /* Assign default initializer. */
10096 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
10097 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
10099 sym->value = gfc_default_initializer (&sym->ts);
10106 /* Resolve symbols with flavor variable. */
10109 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
10111 int no_init_flag, automatic_flag;
10113 const char *auto_save_msg;
10115 auto_save_msg = "Automatic object '%s' at %L cannot have the "
10118 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10121 /* Set this flag to check that variables are parameters of all entries.
10122 This check is effected by the call to gfc_resolve_expr through
10123 is_non_constant_shape_array. */
10124 specification_expr = 1;
10126 if (sym->ns->proc_name
10127 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10128 || sym->ns->proc_name->attr.is_main_program)
10129 && !sym->attr.use_assoc
10130 && !sym->attr.allocatable
10131 && !sym->attr.pointer
10132 && is_non_constant_shape_array (sym))
10134 /* The shape of a main program or module array needs to be
10136 gfc_error ("The module or main program array '%s' at %L must "
10137 "have constant shape", sym->name, &sym->declared_at);
10138 specification_expr = 0;
10142 /* Constraints on deferred type parameter. */
10143 if (sym->ts.deferred && !(sym->attr.pointer || sym->attr.allocatable))
10145 gfc_error ("Entity '%s' at %L has a deferred type parameter and "
10146 "requires either the pointer or allocatable attribute",
10147 sym->name, &sym->declared_at);
10151 if (sym->ts.type == BT_CHARACTER)
10153 /* Make sure that character string variables with assumed length are
10154 dummy arguments. */
10155 e = sym->ts.u.cl->length;
10156 if (e == NULL && !sym->attr.dummy && !sym->attr.result
10157 && !sym->ts.deferred)
10159 gfc_error ("Entity with assumed character length at %L must be a "
10160 "dummy argument or a PARAMETER", &sym->declared_at);
10164 if (e && sym->attr.save == SAVE_EXPLICIT && !gfc_is_constant_expr (e))
10166 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10170 if (!gfc_is_constant_expr (e)
10171 && !(e->expr_type == EXPR_VARIABLE
10172 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
10173 && sym->ns->proc_name
10174 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10175 || sym->ns->proc_name->attr.is_main_program)
10176 && !sym->attr.use_assoc)
10178 gfc_error ("'%s' at %L must have constant character length "
10179 "in this context", sym->name, &sym->declared_at);
10184 if (sym->value == NULL && sym->attr.referenced)
10185 apply_default_init_local (sym); /* Try to apply a default initialization. */
10187 /* Determine if the symbol may not have an initializer. */
10188 no_init_flag = automatic_flag = 0;
10189 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
10190 || sym->attr.intrinsic || sym->attr.result)
10192 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
10193 && is_non_constant_shape_array (sym))
10195 no_init_flag = automatic_flag = 1;
10197 /* Also, they must not have the SAVE attribute.
10198 SAVE_IMPLICIT is checked below. */
10199 if (sym->as && sym->attr.codimension)
10201 int corank = sym->as->corank;
10202 sym->as->corank = 0;
10203 no_init_flag = automatic_flag = is_non_constant_shape_array (sym);
10204 sym->as->corank = corank;
10206 if (automatic_flag && sym->attr.save == SAVE_EXPLICIT)
10208 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10213 /* Ensure that any initializer is simplified. */
10215 gfc_simplify_expr (sym->value, 1);
10217 /* Reject illegal initializers. */
10218 if (!sym->mark && sym->value)
10220 if (sym->attr.allocatable || (sym->ts.type == BT_CLASS
10221 && CLASS_DATA (sym)->attr.allocatable))
10222 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
10223 sym->name, &sym->declared_at);
10224 else if (sym->attr.external)
10225 gfc_error ("External '%s' at %L cannot have an initializer",
10226 sym->name, &sym->declared_at);
10227 else if (sym->attr.dummy
10228 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
10229 gfc_error ("Dummy '%s' at %L cannot have an initializer",
10230 sym->name, &sym->declared_at);
10231 else if (sym->attr.intrinsic)
10232 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
10233 sym->name, &sym->declared_at);
10234 else if (sym->attr.result)
10235 gfc_error ("Function result '%s' at %L cannot have an initializer",
10236 sym->name, &sym->declared_at);
10237 else if (automatic_flag)
10238 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
10239 sym->name, &sym->declared_at);
10241 goto no_init_error;
10246 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
10247 return resolve_fl_variable_derived (sym, no_init_flag);
10253 /* Resolve a procedure. */
10256 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
10258 gfc_formal_arglist *arg;
10260 if (sym->attr.function
10261 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10264 if (sym->ts.type == BT_CHARACTER)
10266 gfc_charlen *cl = sym->ts.u.cl;
10268 if (cl && cl->length && gfc_is_constant_expr (cl->length)
10269 && resolve_charlen (cl) == FAILURE)
10272 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10273 && sym->attr.proc == PROC_ST_FUNCTION)
10275 gfc_error ("Character-valued statement function '%s' at %L must "
10276 "have constant length", sym->name, &sym->declared_at);
10281 /* Ensure that derived type for are not of a private type. Internal
10282 module procedures are excluded by 2.2.3.3 - i.e., they are not
10283 externally accessible and can access all the objects accessible in
10285 if (!(sym->ns->parent
10286 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
10287 && gfc_check_symbol_access (sym))
10289 gfc_interface *iface;
10291 for (arg = sym->formal; arg; arg = arg->next)
10294 && arg->sym->ts.type == BT_DERIVED
10295 && !arg->sym->ts.u.derived->attr.use_assoc
10296 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10297 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
10298 "PRIVATE type and cannot be a dummy argument"
10299 " of '%s', which is PUBLIC at %L",
10300 arg->sym->name, sym->name, &sym->declared_at)
10303 /* Stop this message from recurring. */
10304 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10309 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10310 PRIVATE to the containing module. */
10311 for (iface = sym->generic; iface; iface = iface->next)
10313 for (arg = iface->sym->formal; arg; arg = arg->next)
10316 && arg->sym->ts.type == BT_DERIVED
10317 && !arg->sym->ts.u.derived->attr.use_assoc
10318 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10319 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10320 "'%s' in PUBLIC interface '%s' at %L "
10321 "takes dummy arguments of '%s' which is "
10322 "PRIVATE", iface->sym->name, sym->name,
10323 &iface->sym->declared_at,
10324 gfc_typename (&arg->sym->ts)) == FAILURE)
10326 /* Stop this message from recurring. */
10327 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10333 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10334 PRIVATE to the containing module. */
10335 for (iface = sym->generic; iface; iface = iface->next)
10337 for (arg = iface->sym->formal; arg; arg = arg->next)
10340 && arg->sym->ts.type == BT_DERIVED
10341 && !arg->sym->ts.u.derived->attr.use_assoc
10342 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10343 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10344 "'%s' in PUBLIC interface '%s' at %L "
10345 "takes dummy arguments of '%s' which is "
10346 "PRIVATE", iface->sym->name, sym->name,
10347 &iface->sym->declared_at,
10348 gfc_typename (&arg->sym->ts)) == FAILURE)
10350 /* Stop this message from recurring. */
10351 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10358 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
10359 && !sym->attr.proc_pointer)
10361 gfc_error ("Function '%s' at %L cannot have an initializer",
10362 sym->name, &sym->declared_at);
10366 /* An external symbol may not have an initializer because it is taken to be
10367 a procedure. Exception: Procedure Pointers. */
10368 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
10370 gfc_error ("External object '%s' at %L may not have an initializer",
10371 sym->name, &sym->declared_at);
10375 /* An elemental function is required to return a scalar 12.7.1 */
10376 if (sym->attr.elemental && sym->attr.function && sym->as)
10378 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
10379 "result", sym->name, &sym->declared_at);
10380 /* Reset so that the error only occurs once. */
10381 sym->attr.elemental = 0;
10385 if (sym->attr.proc == PROC_ST_FUNCTION
10386 && (sym->attr.allocatable || sym->attr.pointer))
10388 gfc_error ("Statement function '%s' at %L may not have pointer or "
10389 "allocatable attribute", sym->name, &sym->declared_at);
10393 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
10394 char-len-param shall not be array-valued, pointer-valued, recursive
10395 or pure. ....snip... A character value of * may only be used in the
10396 following ways: (i) Dummy arg of procedure - dummy associates with
10397 actual length; (ii) To declare a named constant; or (iii) External
10398 function - but length must be declared in calling scoping unit. */
10399 if (sym->attr.function
10400 && sym->ts.type == BT_CHARACTER
10401 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
10403 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
10404 || (sym->attr.recursive) || (sym->attr.pure))
10406 if (sym->as && sym->as->rank)
10407 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10408 "array-valued", sym->name, &sym->declared_at);
10410 if (sym->attr.pointer)
10411 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10412 "pointer-valued", sym->name, &sym->declared_at);
10414 if (sym->attr.pure)
10415 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10416 "pure", sym->name, &sym->declared_at);
10418 if (sym->attr.recursive)
10419 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10420 "recursive", sym->name, &sym->declared_at);
10425 /* Appendix B.2 of the standard. Contained functions give an
10426 error anyway. Fixed-form is likely to be F77/legacy. Deferred
10427 character length is an F2003 feature. */
10428 if (!sym->attr.contained
10429 && gfc_current_form != FORM_FIXED
10430 && !sym->ts.deferred)
10431 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
10432 "CHARACTER(*) function '%s' at %L",
10433 sym->name, &sym->declared_at);
10436 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
10438 gfc_formal_arglist *curr_arg;
10439 int has_non_interop_arg = 0;
10441 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10442 sym->common_block) == FAILURE)
10444 /* Clear these to prevent looking at them again if there was an
10446 sym->attr.is_bind_c = 0;
10447 sym->attr.is_c_interop = 0;
10448 sym->ts.is_c_interop = 0;
10452 /* So far, no errors have been found. */
10453 sym->attr.is_c_interop = 1;
10454 sym->ts.is_c_interop = 1;
10457 curr_arg = sym->formal;
10458 while (curr_arg != NULL)
10460 /* Skip implicitly typed dummy args here. */
10461 if (curr_arg->sym->attr.implicit_type == 0)
10462 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
10463 /* If something is found to fail, record the fact so we
10464 can mark the symbol for the procedure as not being
10465 BIND(C) to try and prevent multiple errors being
10467 has_non_interop_arg = 1;
10469 curr_arg = curr_arg->next;
10472 /* See if any of the arguments were not interoperable and if so, clear
10473 the procedure symbol to prevent duplicate error messages. */
10474 if (has_non_interop_arg != 0)
10476 sym->attr.is_c_interop = 0;
10477 sym->ts.is_c_interop = 0;
10478 sym->attr.is_bind_c = 0;
10482 if (!sym->attr.proc_pointer)
10484 if (sym->attr.save == SAVE_EXPLICIT)
10486 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
10487 "in '%s' at %L", sym->name, &sym->declared_at);
10490 if (sym->attr.intent)
10492 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
10493 "in '%s' at %L", sym->name, &sym->declared_at);
10496 if (sym->attr.subroutine && sym->attr.result)
10498 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
10499 "in '%s' at %L", sym->name, &sym->declared_at);
10502 if (sym->attr.external && sym->attr.function
10503 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
10504 || sym->attr.contained))
10506 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
10507 "in '%s' at %L", sym->name, &sym->declared_at);
10510 if (strcmp ("ppr@", sym->name) == 0)
10512 gfc_error ("Procedure pointer result '%s' at %L "
10513 "is missing the pointer attribute",
10514 sym->ns->proc_name->name, &sym->declared_at);
10523 /* Resolve a list of finalizer procedures. That is, after they have hopefully
10524 been defined and we now know their defined arguments, check that they fulfill
10525 the requirements of the standard for procedures used as finalizers. */
10528 gfc_resolve_finalizers (gfc_symbol* derived)
10530 gfc_finalizer* list;
10531 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
10532 gfc_try result = SUCCESS;
10533 bool seen_scalar = false;
10535 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
10538 /* Walk over the list of finalizer-procedures, check them, and if any one
10539 does not fit in with the standard's definition, print an error and remove
10540 it from the list. */
10541 prev_link = &derived->f2k_derived->finalizers;
10542 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
10548 /* Skip this finalizer if we already resolved it. */
10549 if (list->proc_tree)
10551 prev_link = &(list->next);
10555 /* Check this exists and is a SUBROUTINE. */
10556 if (!list->proc_sym->attr.subroutine)
10558 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
10559 list->proc_sym->name, &list->where);
10563 /* We should have exactly one argument. */
10564 if (!list->proc_sym->formal || list->proc_sym->formal->next)
10566 gfc_error ("FINAL procedure at %L must have exactly one argument",
10570 arg = list->proc_sym->formal->sym;
10572 /* This argument must be of our type. */
10573 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
10575 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
10576 &arg->declared_at, derived->name);
10580 /* It must neither be a pointer nor allocatable nor optional. */
10581 if (arg->attr.pointer)
10583 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
10584 &arg->declared_at);
10587 if (arg->attr.allocatable)
10589 gfc_error ("Argument of FINAL procedure at %L must not be"
10590 " ALLOCATABLE", &arg->declared_at);
10593 if (arg->attr.optional)
10595 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
10596 &arg->declared_at);
10600 /* It must not be INTENT(OUT). */
10601 if (arg->attr.intent == INTENT_OUT)
10603 gfc_error ("Argument of FINAL procedure at %L must not be"
10604 " INTENT(OUT)", &arg->declared_at);
10608 /* Warn if the procedure is non-scalar and not assumed shape. */
10609 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
10610 && arg->as->type != AS_ASSUMED_SHAPE)
10611 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
10612 " shape argument", &arg->declared_at);
10614 /* Check that it does not match in kind and rank with a FINAL procedure
10615 defined earlier. To really loop over the *earlier* declarations,
10616 we need to walk the tail of the list as new ones were pushed at the
10618 /* TODO: Handle kind parameters once they are implemented. */
10619 my_rank = (arg->as ? arg->as->rank : 0);
10620 for (i = list->next; i; i = i->next)
10622 /* Argument list might be empty; that is an error signalled earlier,
10623 but we nevertheless continued resolving. */
10624 if (i->proc_sym->formal)
10626 gfc_symbol* i_arg = i->proc_sym->formal->sym;
10627 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
10628 if (i_rank == my_rank)
10630 gfc_error ("FINAL procedure '%s' declared at %L has the same"
10631 " rank (%d) as '%s'",
10632 list->proc_sym->name, &list->where, my_rank,
10633 i->proc_sym->name);
10639 /* Is this the/a scalar finalizer procedure? */
10640 if (!arg->as || arg->as->rank == 0)
10641 seen_scalar = true;
10643 /* Find the symtree for this procedure. */
10644 gcc_assert (!list->proc_tree);
10645 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
10647 prev_link = &list->next;
10650 /* Remove wrong nodes immediately from the list so we don't risk any
10651 troubles in the future when they might fail later expectations. */
10655 *prev_link = list->next;
10656 gfc_free_finalizer (i);
10659 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
10660 were nodes in the list, must have been for arrays. It is surely a good
10661 idea to have a scalar version there if there's something to finalize. */
10662 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
10663 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
10664 " defined at %L, suggest also scalar one",
10665 derived->name, &derived->declared_at);
10667 /* TODO: Remove this error when finalization is finished. */
10668 gfc_error ("Finalization at %L is not yet implemented",
10669 &derived->declared_at);
10675 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10678 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10679 const char* generic_name, locus where)
10684 gcc_assert (t1->specific && t2->specific);
10685 gcc_assert (!t1->specific->is_generic);
10686 gcc_assert (!t2->specific->is_generic);
10688 sym1 = t1->specific->u.specific->n.sym;
10689 sym2 = t2->specific->u.specific->n.sym;
10694 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10695 if (sym1->attr.subroutine != sym2->attr.subroutine
10696 || sym1->attr.function != sym2->attr.function)
10698 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10699 " GENERIC '%s' at %L",
10700 sym1->name, sym2->name, generic_name, &where);
10704 /* Compare the interfaces. */
10705 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10707 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10708 sym1->name, sym2->name, generic_name, &where);
10716 /* Worker function for resolving a generic procedure binding; this is used to
10717 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10719 The difference between those cases is finding possible inherited bindings
10720 that are overridden, as one has to look for them in tb_sym_root,
10721 tb_uop_root or tb_op, respectively. Thus the caller must already find
10722 the super-type and set p->overridden correctly. */
10725 resolve_tb_generic_targets (gfc_symbol* super_type,
10726 gfc_typebound_proc* p, const char* name)
10728 gfc_tbp_generic* target;
10729 gfc_symtree* first_target;
10730 gfc_symtree* inherited;
10732 gcc_assert (p && p->is_generic);
10734 /* Try to find the specific bindings for the symtrees in our target-list. */
10735 gcc_assert (p->u.generic);
10736 for (target = p->u.generic; target; target = target->next)
10737 if (!target->specific)
10739 gfc_typebound_proc* overridden_tbp;
10740 gfc_tbp_generic* g;
10741 const char* target_name;
10743 target_name = target->specific_st->name;
10745 /* Defined for this type directly. */
10746 if (target->specific_st->n.tb && !target->specific_st->n.tb->error)
10748 target->specific = target->specific_st->n.tb;
10749 goto specific_found;
10752 /* Look for an inherited specific binding. */
10755 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10760 gcc_assert (inherited->n.tb);
10761 target->specific = inherited->n.tb;
10762 goto specific_found;
10766 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10767 " at %L", target_name, name, &p->where);
10770 /* Once we've found the specific binding, check it is not ambiguous with
10771 other specifics already found or inherited for the same GENERIC. */
10773 gcc_assert (target->specific);
10775 /* This must really be a specific binding! */
10776 if (target->specific->is_generic)
10778 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10779 " '%s' is GENERIC, too", name, &p->where, target_name);
10783 /* Check those already resolved on this type directly. */
10784 for (g = p->u.generic; g; g = g->next)
10785 if (g != target && g->specific
10786 && check_generic_tbp_ambiguity (target, g, name, p->where)
10790 /* Check for ambiguity with inherited specific targets. */
10791 for (overridden_tbp = p->overridden; overridden_tbp;
10792 overridden_tbp = overridden_tbp->overridden)
10793 if (overridden_tbp->is_generic)
10795 for (g = overridden_tbp->u.generic; g; g = g->next)
10797 gcc_assert (g->specific);
10798 if (check_generic_tbp_ambiguity (target, g,
10799 name, p->where) == FAILURE)
10805 /* If we attempt to "overwrite" a specific binding, this is an error. */
10806 if (p->overridden && !p->overridden->is_generic)
10808 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10809 " the same name", name, &p->where);
10813 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10814 all must have the same attributes here. */
10815 first_target = p->u.generic->specific->u.specific;
10816 gcc_assert (first_target);
10817 p->subroutine = first_target->n.sym->attr.subroutine;
10818 p->function = first_target->n.sym->attr.function;
10824 /* Resolve a GENERIC procedure binding for a derived type. */
10827 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10829 gfc_symbol* super_type;
10831 /* Find the overridden binding if any. */
10832 st->n.tb->overridden = NULL;
10833 super_type = gfc_get_derived_super_type (derived);
10836 gfc_symtree* overridden;
10837 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10840 if (overridden && overridden->n.tb)
10841 st->n.tb->overridden = overridden->n.tb;
10844 /* Resolve using worker function. */
10845 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10849 /* Retrieve the target-procedure of an operator binding and do some checks in
10850 common for intrinsic and user-defined type-bound operators. */
10853 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10855 gfc_symbol* target_proc;
10857 gcc_assert (target->specific && !target->specific->is_generic);
10858 target_proc = target->specific->u.specific->n.sym;
10859 gcc_assert (target_proc);
10861 /* All operator bindings must have a passed-object dummy argument. */
10862 if (target->specific->nopass)
10864 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10868 return target_proc;
10872 /* Resolve a type-bound intrinsic operator. */
10875 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10876 gfc_typebound_proc* p)
10878 gfc_symbol* super_type;
10879 gfc_tbp_generic* target;
10881 /* If there's already an error here, do nothing (but don't fail again). */
10885 /* Operators should always be GENERIC bindings. */
10886 gcc_assert (p->is_generic);
10888 /* Look for an overridden binding. */
10889 super_type = gfc_get_derived_super_type (derived);
10890 if (super_type && super_type->f2k_derived)
10891 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10894 p->overridden = NULL;
10896 /* Resolve general GENERIC properties using worker function. */
10897 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10900 /* Check the targets to be procedures of correct interface. */
10901 for (target = p->u.generic; target; target = target->next)
10903 gfc_symbol* target_proc;
10905 target_proc = get_checked_tb_operator_target (target, p->where);
10909 if (!gfc_check_operator_interface (target_proc, op, p->where))
10921 /* Resolve a type-bound user operator (tree-walker callback). */
10923 static gfc_symbol* resolve_bindings_derived;
10924 static gfc_try resolve_bindings_result;
10926 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
10929 resolve_typebound_user_op (gfc_symtree* stree)
10931 gfc_symbol* super_type;
10932 gfc_tbp_generic* target;
10934 gcc_assert (stree && stree->n.tb);
10936 if (stree->n.tb->error)
10939 /* Operators should always be GENERIC bindings. */
10940 gcc_assert (stree->n.tb->is_generic);
10942 /* Find overridden procedure, if any. */
10943 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
10944 if (super_type && super_type->f2k_derived)
10946 gfc_symtree* overridden;
10947 overridden = gfc_find_typebound_user_op (super_type, NULL,
10948 stree->name, true, NULL);
10950 if (overridden && overridden->n.tb)
10951 stree->n.tb->overridden = overridden->n.tb;
10954 stree->n.tb->overridden = NULL;
10956 /* Resolve basically using worker function. */
10957 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
10961 /* Check the targets to be functions of correct interface. */
10962 for (target = stree->n.tb->u.generic; target; target = target->next)
10964 gfc_symbol* target_proc;
10966 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
10970 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
10977 resolve_bindings_result = FAILURE;
10978 stree->n.tb->error = 1;
10982 /* Resolve the type-bound procedures for a derived type. */
10985 resolve_typebound_procedure (gfc_symtree* stree)
10989 gfc_symbol* me_arg;
10990 gfc_symbol* super_type;
10991 gfc_component* comp;
10993 gcc_assert (stree);
10995 /* Undefined specific symbol from GENERIC target definition. */
10999 if (stree->n.tb->error)
11002 /* If this is a GENERIC binding, use that routine. */
11003 if (stree->n.tb->is_generic)
11005 if (resolve_typebound_generic (resolve_bindings_derived, stree)
11011 /* Get the target-procedure to check it. */
11012 gcc_assert (!stree->n.tb->is_generic);
11013 gcc_assert (stree->n.tb->u.specific);
11014 proc = stree->n.tb->u.specific->n.sym;
11015 where = stree->n.tb->where;
11017 /* Default access should already be resolved from the parser. */
11018 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
11020 /* It should be a module procedure or an external procedure with explicit
11021 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
11022 if ((!proc->attr.subroutine && !proc->attr.function)
11023 || (proc->attr.proc != PROC_MODULE
11024 && proc->attr.if_source != IFSRC_IFBODY)
11025 || (proc->attr.abstract && !stree->n.tb->deferred))
11027 gfc_error ("'%s' must be a module procedure or an external procedure with"
11028 " an explicit interface at %L", proc->name, &where);
11031 stree->n.tb->subroutine = proc->attr.subroutine;
11032 stree->n.tb->function = proc->attr.function;
11034 /* Find the super-type of the current derived type. We could do this once and
11035 store in a global if speed is needed, but as long as not I believe this is
11036 more readable and clearer. */
11037 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11039 /* If PASS, resolve and check arguments if not already resolved / loaded
11040 from a .mod file. */
11041 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
11043 if (stree->n.tb->pass_arg)
11045 gfc_formal_arglist* i;
11047 /* If an explicit passing argument name is given, walk the arg-list
11048 and look for it. */
11051 stree->n.tb->pass_arg_num = 1;
11052 for (i = proc->formal; i; i = i->next)
11054 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
11059 ++stree->n.tb->pass_arg_num;
11064 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
11066 proc->name, stree->n.tb->pass_arg, &where,
11067 stree->n.tb->pass_arg);
11073 /* Otherwise, take the first one; there should in fact be at least
11075 stree->n.tb->pass_arg_num = 1;
11078 gfc_error ("Procedure '%s' with PASS at %L must have at"
11079 " least one argument", proc->name, &where);
11082 me_arg = proc->formal->sym;
11085 /* Now check that the argument-type matches and the passed-object
11086 dummy argument is generally fine. */
11088 gcc_assert (me_arg);
11090 if (me_arg->ts.type != BT_CLASS)
11092 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11093 " at %L", proc->name, &where);
11097 if (CLASS_DATA (me_arg)->ts.u.derived
11098 != resolve_bindings_derived)
11100 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11101 " the derived-type '%s'", me_arg->name, proc->name,
11102 me_arg->name, &where, resolve_bindings_derived->name);
11106 gcc_assert (me_arg->ts.type == BT_CLASS);
11107 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
11109 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
11110 " scalar", proc->name, &where);
11113 if (CLASS_DATA (me_arg)->attr.allocatable)
11115 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11116 " be ALLOCATABLE", proc->name, &where);
11119 if (CLASS_DATA (me_arg)->attr.class_pointer)
11121 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11122 " be POINTER", proc->name, &where);
11127 /* If we are extending some type, check that we don't override a procedure
11128 flagged NON_OVERRIDABLE. */
11129 stree->n.tb->overridden = NULL;
11132 gfc_symtree* overridden;
11133 overridden = gfc_find_typebound_proc (super_type, NULL,
11134 stree->name, true, NULL);
11138 if (overridden->n.tb)
11139 stree->n.tb->overridden = overridden->n.tb;
11141 if (gfc_check_typebound_override (stree, overridden) == FAILURE)
11146 /* See if there's a name collision with a component directly in this type. */
11147 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
11148 if (!strcmp (comp->name, stree->name))
11150 gfc_error ("Procedure '%s' at %L has the same name as a component of"
11152 stree->name, &where, resolve_bindings_derived->name);
11156 /* Try to find a name collision with an inherited component. */
11157 if (super_type && gfc_find_component (super_type, stree->name, true, true))
11159 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
11160 " component of '%s'",
11161 stree->name, &where, resolve_bindings_derived->name);
11165 stree->n.tb->error = 0;
11169 resolve_bindings_result = FAILURE;
11170 stree->n.tb->error = 1;
11175 resolve_typebound_procedures (gfc_symbol* derived)
11178 gfc_symbol* super_type;
11180 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
11183 super_type = gfc_get_derived_super_type (derived);
11185 resolve_typebound_procedures (super_type);
11187 resolve_bindings_derived = derived;
11188 resolve_bindings_result = SUCCESS;
11190 /* Make sure the vtab has been generated. */
11191 gfc_find_derived_vtab (derived);
11193 if (derived->f2k_derived->tb_sym_root)
11194 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
11195 &resolve_typebound_procedure);
11197 if (derived->f2k_derived->tb_uop_root)
11198 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
11199 &resolve_typebound_user_op);
11201 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
11203 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
11204 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
11206 resolve_bindings_result = FAILURE;
11209 return resolve_bindings_result;
11213 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
11214 to give all identical derived types the same backend_decl. */
11216 add_dt_to_dt_list (gfc_symbol *derived)
11218 gfc_dt_list *dt_list;
11220 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
11221 if (derived == dt_list->derived)
11224 dt_list = gfc_get_dt_list ();
11225 dt_list->next = gfc_derived_types;
11226 dt_list->derived = derived;
11227 gfc_derived_types = dt_list;
11231 /* Ensure that a derived-type is really not abstract, meaning that every
11232 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
11235 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
11240 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
11242 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
11245 if (st->n.tb && st->n.tb->deferred)
11247 gfc_symtree* overriding;
11248 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
11251 gcc_assert (overriding->n.tb);
11252 if (overriding->n.tb->deferred)
11254 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
11255 " '%s' is DEFERRED and not overridden",
11256 sub->name, &sub->declared_at, st->name);
11265 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
11267 /* The algorithm used here is to recursively travel up the ancestry of sub
11268 and for each ancestor-type, check all bindings. If any of them is
11269 DEFERRED, look it up starting from sub and see if the found (overriding)
11270 binding is not DEFERRED.
11271 This is not the most efficient way to do this, but it should be ok and is
11272 clearer than something sophisticated. */
11274 gcc_assert (ancestor && !sub->attr.abstract);
11276 if (!ancestor->attr.abstract)
11279 /* Walk bindings of this ancestor. */
11280 if (ancestor->f2k_derived)
11283 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
11288 /* Find next ancestor type and recurse on it. */
11289 ancestor = gfc_get_derived_super_type (ancestor);
11291 return ensure_not_abstract (sub, ancestor);
11297 /* Resolve the components of a derived type. This does not have to wait until
11298 resolution stage, but can be done as soon as the dt declaration has been
11302 resolve_fl_derived0 (gfc_symbol *sym)
11304 gfc_symbol* super_type;
11307 super_type = gfc_get_derived_super_type (sym);
11310 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
11312 gfc_error ("As extending type '%s' at %L has a coarray component, "
11313 "parent type '%s' shall also have one", sym->name,
11314 &sym->declared_at, super_type->name);
11318 /* Ensure the extended type gets resolved before we do. */
11319 if (super_type && resolve_fl_derived0 (super_type) == FAILURE)
11322 /* An ABSTRACT type must be extensible. */
11323 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
11325 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
11326 sym->name, &sym->declared_at);
11330 for (c = sym->components; c != NULL; c = c->next)
11333 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
11334 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
11336 gfc_error ("Coarray component '%s' at %L must be allocatable with "
11337 "deferred shape", c->name, &c->loc);
11342 if (c->attr.codimension && c->ts.type == BT_DERIVED
11343 && c->ts.u.derived->ts.is_iso_c)
11345 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11346 "shall not be a coarray", c->name, &c->loc);
11351 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
11352 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
11353 || c->attr.allocatable))
11355 gfc_error ("Component '%s' at %L with coarray component "
11356 "shall be a nonpointer, nonallocatable scalar",
11362 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
11364 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
11365 "is not an array pointer", c->name, &c->loc);
11369 if (c->attr.proc_pointer && c->ts.interface)
11371 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
11372 gfc_error ("Interface '%s', used by procedure pointer component "
11373 "'%s' at %L, is declared in a later PROCEDURE statement",
11374 c->ts.interface->name, c->name, &c->loc);
11376 /* Get the attributes from the interface (now resolved). */
11377 if (c->ts.interface->attr.if_source
11378 || c->ts.interface->attr.intrinsic)
11380 gfc_symbol *ifc = c->ts.interface;
11382 if (ifc->formal && !ifc->formal_ns)
11383 resolve_symbol (ifc);
11385 if (ifc->attr.intrinsic)
11386 resolve_intrinsic (ifc, &ifc->declared_at);
11390 c->ts = ifc->result->ts;
11391 c->attr.allocatable = ifc->result->attr.allocatable;
11392 c->attr.pointer = ifc->result->attr.pointer;
11393 c->attr.dimension = ifc->result->attr.dimension;
11394 c->as = gfc_copy_array_spec (ifc->result->as);
11399 c->attr.allocatable = ifc->attr.allocatable;
11400 c->attr.pointer = ifc->attr.pointer;
11401 c->attr.dimension = ifc->attr.dimension;
11402 c->as = gfc_copy_array_spec (ifc->as);
11404 c->ts.interface = ifc;
11405 c->attr.function = ifc->attr.function;
11406 c->attr.subroutine = ifc->attr.subroutine;
11407 gfc_copy_formal_args_ppc (c, ifc);
11409 c->attr.pure = ifc->attr.pure;
11410 c->attr.elemental = ifc->attr.elemental;
11411 c->attr.recursive = ifc->attr.recursive;
11412 c->attr.always_explicit = ifc->attr.always_explicit;
11413 c->attr.ext_attr |= ifc->attr.ext_attr;
11414 /* Replace symbols in array spec. */
11418 for (i = 0; i < c->as->rank; i++)
11420 gfc_expr_replace_comp (c->as->lower[i], c);
11421 gfc_expr_replace_comp (c->as->upper[i], c);
11424 /* Copy char length. */
11425 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11427 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11428 gfc_expr_replace_comp (cl->length, c);
11429 if (cl->length && !cl->resolved
11430 && gfc_resolve_expr (cl->length) == FAILURE)
11435 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
11437 gfc_error ("Interface '%s' of procedure pointer component "
11438 "'%s' at %L must be explicit", c->ts.interface->name,
11443 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
11445 /* Since PPCs are not implicitly typed, a PPC without an explicit
11446 interface must be a subroutine. */
11447 gfc_add_subroutine (&c->attr, c->name, &c->loc);
11450 /* Procedure pointer components: Check PASS arg. */
11451 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
11452 && !sym->attr.vtype)
11454 gfc_symbol* me_arg;
11456 if (c->tb->pass_arg)
11458 gfc_formal_arglist* i;
11460 /* If an explicit passing argument name is given, walk the arg-list
11461 and look for it. */
11464 c->tb->pass_arg_num = 1;
11465 for (i = c->formal; i; i = i->next)
11467 if (!strcmp (i->sym->name, c->tb->pass_arg))
11472 c->tb->pass_arg_num++;
11477 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11478 "at %L has no argument '%s'", c->name,
11479 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11486 /* Otherwise, take the first one; there should in fact be at least
11488 c->tb->pass_arg_num = 1;
11491 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11492 "must have at least one argument",
11497 me_arg = c->formal->sym;
11500 /* Now check that the argument-type matches. */
11501 gcc_assert (me_arg);
11502 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11503 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11504 || (me_arg->ts.type == BT_CLASS
11505 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11507 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11508 " the derived type '%s'", me_arg->name, c->name,
11509 me_arg->name, &c->loc, sym->name);
11514 /* Check for C453. */
11515 if (me_arg->attr.dimension)
11517 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11518 "must be scalar", me_arg->name, c->name, me_arg->name,
11524 if (me_arg->attr.pointer)
11526 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11527 "may not have the POINTER attribute", me_arg->name,
11528 c->name, me_arg->name, &c->loc);
11533 if (me_arg->attr.allocatable)
11535 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11536 "may not be ALLOCATABLE", me_arg->name, c->name,
11537 me_arg->name, &c->loc);
11542 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11543 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11544 " at %L", c->name, &c->loc);
11548 /* Check type-spec if this is not the parent-type component. */
11549 if ((!sym->attr.extension || c != sym->components) && !sym->attr.vtype
11550 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11553 /* If this type is an extension, set the accessibility of the parent
11555 if (super_type && c == sym->components
11556 && strcmp (super_type->name, c->name) == 0)
11557 c->attr.access = super_type->attr.access;
11559 /* If this type is an extension, see if this component has the same name
11560 as an inherited type-bound procedure. */
11561 if (super_type && !sym->attr.is_class
11562 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11564 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11565 " inherited type-bound procedure",
11566 c->name, sym->name, &c->loc);
11570 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer
11571 && !c->ts.deferred)
11573 if (c->ts.u.cl->length == NULL
11574 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11575 || !gfc_is_constant_expr (c->ts.u.cl->length))
11577 gfc_error ("Character length of component '%s' needs to "
11578 "be a constant specification expression at %L",
11580 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11585 if (c->ts.type == BT_CHARACTER && c->ts.deferred
11586 && !c->attr.pointer && !c->attr.allocatable)
11588 gfc_error ("Character component '%s' of '%s' at %L with deferred "
11589 "length must be a POINTER or ALLOCATABLE",
11590 c->name, sym->name, &c->loc);
11594 if (c->ts.type == BT_DERIVED
11595 && sym->component_access != ACCESS_PRIVATE
11596 && gfc_check_symbol_access (sym)
11597 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11598 && !c->ts.u.derived->attr.use_assoc
11599 && !gfc_check_symbol_access (c->ts.u.derived)
11600 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11601 "is a PRIVATE type and cannot be a component of "
11602 "'%s', which is PUBLIC at %L", c->name,
11603 sym->name, &sym->declared_at) == FAILURE)
11606 if ((sym->attr.sequence || sym->attr.is_bind_c) && c->ts.type == BT_CLASS)
11608 gfc_error ("Polymorphic component %s at %L in SEQUENCE or BIND(C) "
11609 "type %s", c->name, &c->loc, sym->name);
11613 if (sym->attr.sequence)
11615 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11617 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11618 "not have the SEQUENCE attribute",
11619 c->ts.u.derived->name, &sym->declared_at);
11624 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && !sym->attr.vtype
11625 && c->attr.pointer && c->ts.u.derived->components == NULL
11626 && !c->ts.u.derived->attr.zero_comp)
11628 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11629 "that has not been declared", c->name, sym->name,
11634 if (c->ts.type == BT_CLASS && c->attr.class_ok
11635 && CLASS_DATA (c)->attr.class_pointer
11636 && CLASS_DATA (c)->ts.u.derived->components == NULL
11637 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11639 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11640 "that has not been declared", c->name, sym->name,
11646 if (c->ts.type == BT_CLASS && c->attr.flavor != FL_PROCEDURE
11647 && (!c->attr.class_ok
11648 || !(CLASS_DATA (c)->attr.class_pointer
11649 || CLASS_DATA (c)->attr.allocatable)))
11651 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11652 "or pointer", c->name, &c->loc);
11656 /* Ensure that all the derived type components are put on the
11657 derived type list; even in formal namespaces, where derived type
11658 pointer components might not have been declared. */
11659 if (c->ts.type == BT_DERIVED
11661 && c->ts.u.derived->components
11663 && sym != c->ts.u.derived)
11664 add_dt_to_dt_list (c->ts.u.derived);
11666 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11667 || c->attr.proc_pointer
11668 || c->attr.allocatable)) == FAILURE)
11672 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11673 all DEFERRED bindings are overridden. */
11674 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11675 && !sym->attr.is_class
11676 && ensure_not_abstract (sym, super_type) == FAILURE)
11679 /* Add derived type to the derived type list. */
11680 add_dt_to_dt_list (sym);
11686 /* The following procedure does the full resolution of a derived type,
11687 including resolution of all type-bound procedures (if present). In contrast
11688 to 'resolve_fl_derived0' this can only be done after the module has been
11689 parsed completely. */
11692 resolve_fl_derived (gfc_symbol *sym)
11694 if (sym->attr.is_class && sym->ts.u.derived == NULL)
11696 /* Fix up incomplete CLASS symbols. */
11697 gfc_component *data = gfc_find_component (sym, "_data", true, true);
11698 gfc_component *vptr = gfc_find_component (sym, "_vptr", true, true);
11699 if (vptr->ts.u.derived == NULL)
11701 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
11703 vptr->ts.u.derived = vtab->ts.u.derived;
11707 if (resolve_fl_derived0 (sym) == FAILURE)
11710 /* Resolve the type-bound procedures. */
11711 if (resolve_typebound_procedures (sym) == FAILURE)
11714 /* Resolve the finalizer procedures. */
11715 if (gfc_resolve_finalizers (sym) == FAILURE)
11723 resolve_fl_namelist (gfc_symbol *sym)
11728 for (nl = sym->namelist; nl; nl = nl->next)
11730 /* Check again, the check in match only works if NAMELIST comes
11732 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SIZE)
11734 gfc_error ("Assumed size array '%s' in namelist '%s' at %L is not "
11735 "allowed", nl->sym->name, sym->name, &sym->declared_at);
11739 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11740 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11741 "object '%s' with assumed shape in namelist "
11742 "'%s' at %L", nl->sym->name, sym->name,
11743 &sym->declared_at) == FAILURE)
11746 if (is_non_constant_shape_array (nl->sym)
11747 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11748 "object '%s' with nonconstant shape in namelist "
11749 "'%s' at %L", nl->sym->name, sym->name,
11750 &sym->declared_at) == FAILURE)
11753 if (nl->sym->ts.type == BT_CHARACTER
11754 && (nl->sym->ts.u.cl->length == NULL
11755 || !gfc_is_constant_expr (nl->sym->ts.u.cl->length))
11756 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11757 "'%s' with nonconstant character length in "
11758 "namelist '%s' at %L", nl->sym->name, sym->name,
11759 &sym->declared_at) == FAILURE)
11762 /* FIXME: Once UDDTIO is implemented, the following can be
11764 if (nl->sym->ts.type == BT_CLASS)
11766 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L is "
11767 "polymorphic and requires a defined input/output "
11768 "procedure", nl->sym->name, sym->name, &sym->declared_at);
11772 if (nl->sym->ts.type == BT_DERIVED
11773 && (nl->sym->ts.u.derived->attr.alloc_comp
11774 || nl->sym->ts.u.derived->attr.pointer_comp))
11776 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11777 "'%s' in namelist '%s' at %L with ALLOCATABLE "
11778 "or POINTER components", nl->sym->name,
11779 sym->name, &sym->declared_at) == FAILURE)
11782 /* FIXME: Once UDDTIO is implemented, the following can be
11784 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L has "
11785 "ALLOCATABLE or POINTER components and thus requires "
11786 "a defined input/output procedure", nl->sym->name,
11787 sym->name, &sym->declared_at);
11792 /* Reject PRIVATE objects in a PUBLIC namelist. */
11793 if (gfc_check_symbol_access (sym))
11795 for (nl = sym->namelist; nl; nl = nl->next)
11797 if (!nl->sym->attr.use_assoc
11798 && !is_sym_host_assoc (nl->sym, sym->ns)
11799 && !gfc_check_symbol_access (nl->sym))
11801 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11802 "cannot be member of PUBLIC namelist '%s' at %L",
11803 nl->sym->name, sym->name, &sym->declared_at);
11807 /* Types with private components that came here by USE-association. */
11808 if (nl->sym->ts.type == BT_DERIVED
11809 && derived_inaccessible (nl->sym->ts.u.derived))
11811 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11812 "components and cannot be member of namelist '%s' at %L",
11813 nl->sym->name, sym->name, &sym->declared_at);
11817 /* Types with private components that are defined in the same module. */
11818 if (nl->sym->ts.type == BT_DERIVED
11819 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11820 && nl->sym->ts.u.derived->attr.private_comp)
11822 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11823 "cannot be a member of PUBLIC namelist '%s' at %L",
11824 nl->sym->name, sym->name, &sym->declared_at);
11831 /* 14.1.2 A module or internal procedure represent local entities
11832 of the same type as a namelist member and so are not allowed. */
11833 for (nl = sym->namelist; nl; nl = nl->next)
11835 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11838 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11839 if ((nl->sym == sym->ns->proc_name)
11841 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11845 if (nl->sym && nl->sym->name)
11846 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11847 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11849 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11850 "attribute in '%s' at %L", nlsym->name,
11851 &sym->declared_at);
11861 resolve_fl_parameter (gfc_symbol *sym)
11863 /* A parameter array's shape needs to be constant. */
11864 if (sym->as != NULL
11865 && (sym->as->type == AS_DEFERRED
11866 || is_non_constant_shape_array (sym)))
11868 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11869 "or of deferred shape", sym->name, &sym->declared_at);
11873 /* Make sure a parameter that has been implicitly typed still
11874 matches the implicit type, since PARAMETER statements can precede
11875 IMPLICIT statements. */
11876 if (sym->attr.implicit_type
11877 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11880 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11881 "later IMPLICIT type", sym->name, &sym->declared_at);
11885 /* Make sure the types of derived parameters are consistent. This
11886 type checking is deferred until resolution because the type may
11887 refer to a derived type from the host. */
11888 if (sym->ts.type == BT_DERIVED
11889 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11891 gfc_error ("Incompatible derived type in PARAMETER at %L",
11892 &sym->value->where);
11899 /* Do anything necessary to resolve a symbol. Right now, we just
11900 assume that an otherwise unknown symbol is a variable. This sort
11901 of thing commonly happens for symbols in module. */
11904 resolve_symbol (gfc_symbol *sym)
11906 int check_constant, mp_flag;
11907 gfc_symtree *symtree;
11908 gfc_symtree *this_symtree;
11912 if (sym->attr.flavor == FL_UNKNOWN)
11915 /* If we find that a flavorless symbol is an interface in one of the
11916 parent namespaces, find its symtree in this namespace, free the
11917 symbol and set the symtree to point to the interface symbol. */
11918 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
11920 symtree = gfc_find_symtree (ns->sym_root, sym->name);
11921 if (symtree && (symtree->n.sym->generic ||
11922 (symtree->n.sym->attr.flavor == FL_PROCEDURE
11923 && sym->ns->construct_entities)))
11925 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
11927 gfc_release_symbol (sym);
11928 symtree->n.sym->refs++;
11929 this_symtree->n.sym = symtree->n.sym;
11934 /* Otherwise give it a flavor according to such attributes as
11936 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
11937 sym->attr.flavor = FL_VARIABLE;
11940 sym->attr.flavor = FL_PROCEDURE;
11941 if (sym->attr.dimension)
11942 sym->attr.function = 1;
11946 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
11947 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
11949 if (sym->attr.procedure && sym->ts.interface
11950 && sym->attr.if_source != IFSRC_DECL
11951 && resolve_procedure_interface (sym) == FAILURE)
11954 if (sym->attr.is_protected && !sym->attr.proc_pointer
11955 && (sym->attr.procedure || sym->attr.external))
11957 if (sym->attr.external)
11958 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
11959 "at %L", &sym->declared_at);
11961 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
11962 "at %L", &sym->declared_at);
11969 if (sym->attr.contiguous
11970 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
11971 && !sym->attr.pointer)))
11973 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
11974 "array pointer or an assumed-shape array", sym->name,
11975 &sym->declared_at);
11979 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
11982 /* Symbols that are module procedures with results (functions) have
11983 the types and array specification copied for type checking in
11984 procedures that call them, as well as for saving to a module
11985 file. These symbols can't stand the scrutiny that their results
11987 mp_flag = (sym->result != NULL && sym->result != sym);
11989 /* Make sure that the intrinsic is consistent with its internal
11990 representation. This needs to be done before assigning a default
11991 type to avoid spurious warnings. */
11992 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
11993 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
11996 /* Resolve associate names. */
11998 resolve_assoc_var (sym, true);
12000 /* Assign default type to symbols that need one and don't have one. */
12001 if (sym->ts.type == BT_UNKNOWN)
12003 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
12004 gfc_set_default_type (sym, 1, NULL);
12006 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
12007 && !sym->attr.function && !sym->attr.subroutine
12008 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
12009 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
12011 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12013 /* The specific case of an external procedure should emit an error
12014 in the case that there is no implicit type. */
12016 gfc_set_default_type (sym, sym->attr.external, NULL);
12019 /* Result may be in another namespace. */
12020 resolve_symbol (sym->result);
12022 if (!sym->result->attr.proc_pointer)
12024 sym->ts = sym->result->ts;
12025 sym->as = gfc_copy_array_spec (sym->result->as);
12026 sym->attr.dimension = sym->result->attr.dimension;
12027 sym->attr.pointer = sym->result->attr.pointer;
12028 sym->attr.allocatable = sym->result->attr.allocatable;
12029 sym->attr.contiguous = sym->result->attr.contiguous;
12034 else if (mp_flag && sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12035 gfc_resolve_array_spec (sym->result->as, false);
12037 /* Assumed size arrays and assumed shape arrays must be dummy
12038 arguments. Array-spec's of implied-shape should have been resolved to
12039 AS_EXPLICIT already. */
12043 gcc_assert (sym->as->type != AS_IMPLIED_SHAPE);
12044 if (((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
12045 || sym->as->type == AS_ASSUMED_SHAPE)
12046 && sym->attr.dummy == 0)
12048 if (sym->as->type == AS_ASSUMED_SIZE)
12049 gfc_error ("Assumed size array at %L must be a dummy argument",
12050 &sym->declared_at);
12052 gfc_error ("Assumed shape array at %L must be a dummy argument",
12053 &sym->declared_at);
12058 /* Make sure symbols with known intent or optional are really dummy
12059 variable. Because of ENTRY statement, this has to be deferred
12060 until resolution time. */
12062 if (!sym->attr.dummy
12063 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
12065 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
12069 if (sym->attr.value && !sym->attr.dummy)
12071 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
12072 "it is not a dummy argument", sym->name, &sym->declared_at);
12076 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
12078 gfc_charlen *cl = sym->ts.u.cl;
12079 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
12081 gfc_error ("Character dummy variable '%s' at %L with VALUE "
12082 "attribute must have constant length",
12083 sym->name, &sym->declared_at);
12087 if (sym->ts.is_c_interop
12088 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
12090 gfc_error ("C interoperable character dummy variable '%s' at %L "
12091 "with VALUE attribute must have length one",
12092 sym->name, &sym->declared_at);
12097 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
12098 do this for something that was implicitly typed because that is handled
12099 in gfc_set_default_type. Handle dummy arguments and procedure
12100 definitions separately. Also, anything that is use associated is not
12101 handled here but instead is handled in the module it is declared in.
12102 Finally, derived type definitions are allowed to be BIND(C) since that
12103 only implies that they're interoperable, and they are checked fully for
12104 interoperability when a variable is declared of that type. */
12105 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
12106 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
12107 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
12109 gfc_try t = SUCCESS;
12111 /* First, make sure the variable is declared at the
12112 module-level scope (J3/04-007, Section 15.3). */
12113 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
12114 sym->attr.in_common == 0)
12116 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
12117 "is neither a COMMON block nor declared at the "
12118 "module level scope", sym->name, &(sym->declared_at));
12121 else if (sym->common_head != NULL)
12123 t = verify_com_block_vars_c_interop (sym->common_head);
12127 /* If type() declaration, we need to verify that the components
12128 of the given type are all C interoperable, etc. */
12129 if (sym->ts.type == BT_DERIVED &&
12130 sym->ts.u.derived->attr.is_c_interop != 1)
12132 /* Make sure the user marked the derived type as BIND(C). If
12133 not, call the verify routine. This could print an error
12134 for the derived type more than once if multiple variables
12135 of that type are declared. */
12136 if (sym->ts.u.derived->attr.is_bind_c != 1)
12137 verify_bind_c_derived_type (sym->ts.u.derived);
12141 /* Verify the variable itself as C interoperable if it
12142 is BIND(C). It is not possible for this to succeed if
12143 the verify_bind_c_derived_type failed, so don't have to handle
12144 any error returned by verify_bind_c_derived_type. */
12145 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
12146 sym->common_block);
12151 /* clear the is_bind_c flag to prevent reporting errors more than
12152 once if something failed. */
12153 sym->attr.is_bind_c = 0;
12158 /* If a derived type symbol has reached this point, without its
12159 type being declared, we have an error. Notice that most
12160 conditions that produce undefined derived types have already
12161 been dealt with. However, the likes of:
12162 implicit type(t) (t) ..... call foo (t) will get us here if
12163 the type is not declared in the scope of the implicit
12164 statement. Change the type to BT_UNKNOWN, both because it is so
12165 and to prevent an ICE. */
12166 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
12167 && !sym->ts.u.derived->attr.zero_comp)
12169 gfc_error ("The derived type '%s' at %L is of type '%s', "
12170 "which has not been defined", sym->name,
12171 &sym->declared_at, sym->ts.u.derived->name);
12172 sym->ts.type = BT_UNKNOWN;
12176 /* Make sure that the derived type has been resolved and that the
12177 derived type is visible in the symbol's namespace, if it is a
12178 module function and is not PRIVATE. */
12179 if (sym->ts.type == BT_DERIVED
12180 && sym->ts.u.derived->attr.use_assoc
12181 && sym->ns->proc_name
12182 && sym->ns->proc_name->attr.flavor == FL_MODULE)
12186 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
12189 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
12190 if (!ds && sym->attr.function && gfc_check_symbol_access (sym))
12192 symtree = gfc_new_symtree (&sym->ns->sym_root,
12193 sym->ts.u.derived->name);
12194 symtree->n.sym = sym->ts.u.derived;
12195 sym->ts.u.derived->refs++;
12199 /* Unless the derived-type declaration is use associated, Fortran 95
12200 does not allow public entries of private derived types.
12201 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
12202 161 in 95-006r3. */
12203 if (sym->ts.type == BT_DERIVED
12204 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
12205 && !sym->ts.u.derived->attr.use_assoc
12206 && gfc_check_symbol_access (sym)
12207 && !gfc_check_symbol_access (sym->ts.u.derived)
12208 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
12209 "of PRIVATE derived type '%s'",
12210 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
12211 : "variable", sym->name, &sym->declared_at,
12212 sym->ts.u.derived->name) == FAILURE)
12215 /* F2008, C1302. */
12216 if (sym->ts.type == BT_DERIVED
12217 && sym->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
12218 && sym->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE
12219 && !sym->attr.codimension)
12221 gfc_error ("Variable '%s' at %L of type LOCK_TYPE must be a coarray",
12222 sym->name, &sym->declared_at);
12226 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
12227 default initialization is defined (5.1.2.4.4). */
12228 if (sym->ts.type == BT_DERIVED
12230 && sym->attr.intent == INTENT_OUT
12232 && sym->as->type == AS_ASSUMED_SIZE)
12234 for (c = sym->ts.u.derived->components; c; c = c->next)
12236 if (c->initializer)
12238 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
12239 "ASSUMED SIZE and so cannot have a default initializer",
12240 sym->name, &sym->declared_at);
12247 if (sym->ts.type == BT_DERIVED && sym->attr.dummy
12248 && sym->attr.intent == INTENT_OUT && sym->attr.lock_comp)
12250 gfc_error ("Dummy argument '%s' at %L of LOCK_TYPE shall not be "
12251 "INTENT(OUT)", sym->name, &sym->declared_at);
12256 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12257 || sym->attr.codimension)
12258 && (sym->attr.result || sym->result == sym))
12260 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
12261 "a coarray component", sym->name, &sym->declared_at);
12266 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
12267 && sym->ts.u.derived->ts.is_iso_c)
12269 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
12270 "shall not be a coarray", sym->name, &sym->declared_at);
12275 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
12276 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
12277 || sym->attr.allocatable))
12279 gfc_error ("Variable '%s' at %L with coarray component "
12280 "shall be a nonpointer, nonallocatable scalar",
12281 sym->name, &sym->declared_at);
12285 /* F2008, C526. The function-result case was handled above. */
12286 if (sym->attr.codimension
12287 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
12288 || sym->ns->save_all
12289 || sym->ns->proc_name->attr.flavor == FL_MODULE
12290 || sym->ns->proc_name->attr.is_main_program
12291 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
12293 gfc_error ("Variable '%s' at %L is a coarray and is not ALLOCATABLE, SAVE "
12294 "nor a dummy argument", sym->name, &sym->declared_at);
12297 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
12298 else if (sym->attr.codimension && !sym->attr.allocatable
12299 && sym->as && sym->as->cotype == AS_DEFERRED)
12301 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
12302 "deferred shape", sym->name, &sym->declared_at);
12305 else if (sym->attr.codimension && sym->attr.allocatable
12306 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
12308 gfc_error ("Allocatable coarray variable '%s' at %L must have "
12309 "deferred shape", sym->name, &sym->declared_at);
12314 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12315 || (sym->attr.codimension && sym->attr.allocatable))
12316 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
12318 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
12319 "allocatable coarray or have coarray components",
12320 sym->name, &sym->declared_at);
12324 if (sym->attr.codimension && sym->attr.dummy
12325 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
12327 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
12328 "procedure '%s'", sym->name, &sym->declared_at,
12329 sym->ns->proc_name->name);
12333 switch (sym->attr.flavor)
12336 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
12341 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
12346 if (resolve_fl_namelist (sym) == FAILURE)
12351 if (resolve_fl_parameter (sym) == FAILURE)
12359 /* Resolve array specifier. Check as well some constraints
12360 on COMMON blocks. */
12362 check_constant = sym->attr.in_common && !sym->attr.pointer;
12364 /* Set the formal_arg_flag so that check_conflict will not throw
12365 an error for host associated variables in the specification
12366 expression for an array_valued function. */
12367 if (sym->attr.function && sym->as)
12368 formal_arg_flag = 1;
12370 gfc_resolve_array_spec (sym->as, check_constant);
12372 formal_arg_flag = 0;
12374 /* Resolve formal namespaces. */
12375 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
12376 && !sym->attr.contained && !sym->attr.intrinsic)
12377 gfc_resolve (sym->formal_ns);
12379 /* Make sure the formal namespace is present. */
12380 if (sym->formal && !sym->formal_ns)
12382 gfc_formal_arglist *formal = sym->formal;
12383 while (formal && !formal->sym)
12384 formal = formal->next;
12388 sym->formal_ns = formal->sym->ns;
12389 sym->formal_ns->refs++;
12393 /* Check threadprivate restrictions. */
12394 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
12395 && (!sym->attr.in_common
12396 && sym->module == NULL
12397 && (sym->ns->proc_name == NULL
12398 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
12399 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
12401 /* If we have come this far we can apply default-initializers, as
12402 described in 14.7.5, to those variables that have not already
12403 been assigned one. */
12404 if (sym->ts.type == BT_DERIVED
12405 && sym->ns == gfc_current_ns
12407 && !sym->attr.allocatable
12408 && !sym->attr.alloc_comp)
12410 symbol_attribute *a = &sym->attr;
12412 if ((!a->save && !a->dummy && !a->pointer
12413 && !a->in_common && !a->use_assoc
12414 && (a->referenced || a->result)
12415 && !(a->function && sym != sym->result))
12416 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
12417 apply_default_init (sym);
12420 if (sym->ts.type == BT_CLASS && sym->ns == gfc_current_ns
12421 && sym->attr.dummy && sym->attr.intent == INTENT_OUT
12422 && !CLASS_DATA (sym)->attr.class_pointer
12423 && !CLASS_DATA (sym)->attr.allocatable)
12424 apply_default_init (sym);
12426 /* If this symbol has a type-spec, check it. */
12427 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
12428 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
12429 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
12435 /************* Resolve DATA statements *************/
12439 gfc_data_value *vnode;
12445 /* Advance the values structure to point to the next value in the data list. */
12448 next_data_value (void)
12450 while (mpz_cmp_ui (values.left, 0) == 0)
12453 if (values.vnode->next == NULL)
12456 values.vnode = values.vnode->next;
12457 mpz_set (values.left, values.vnode->repeat);
12465 check_data_variable (gfc_data_variable *var, locus *where)
12471 ar_type mark = AR_UNKNOWN;
12473 mpz_t section_index[GFC_MAX_DIMENSIONS];
12479 if (gfc_resolve_expr (var->expr) == FAILURE)
12483 mpz_init_set_si (offset, 0);
12486 if (e->expr_type != EXPR_VARIABLE)
12487 gfc_internal_error ("check_data_variable(): Bad expression");
12489 sym = e->symtree->n.sym;
12491 if (sym->ns->is_block_data && !sym->attr.in_common)
12493 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
12494 sym->name, &sym->declared_at);
12497 if (e->ref == NULL && sym->as)
12499 gfc_error ("DATA array '%s' at %L must be specified in a previous"
12500 " declaration", sym->name, where);
12504 has_pointer = sym->attr.pointer;
12506 if (gfc_is_coindexed (e))
12508 gfc_error ("DATA element '%s' at %L cannot have a coindex", sym->name,
12513 for (ref = e->ref; ref; ref = ref->next)
12515 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
12519 && ref->type == REF_ARRAY
12520 && ref->u.ar.type != AR_FULL)
12522 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12523 "be a full array", sym->name, where);
12528 if (e->rank == 0 || has_pointer)
12530 mpz_init_set_ui (size, 1);
12537 /* Find the array section reference. */
12538 for (ref = e->ref; ref; ref = ref->next)
12540 if (ref->type != REF_ARRAY)
12542 if (ref->u.ar.type == AR_ELEMENT)
12548 /* Set marks according to the reference pattern. */
12549 switch (ref->u.ar.type)
12557 /* Get the start position of array section. */
12558 gfc_get_section_index (ar, section_index, &offset);
12563 gcc_unreachable ();
12566 if (gfc_array_size (e, &size) == FAILURE)
12568 gfc_error ("Nonconstant array section at %L in DATA statement",
12570 mpz_clear (offset);
12577 while (mpz_cmp_ui (size, 0) > 0)
12579 if (next_data_value () == FAILURE)
12581 gfc_error ("DATA statement at %L has more variables than values",
12587 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12591 /* If we have more than one element left in the repeat count,
12592 and we have more than one element left in the target variable,
12593 then create a range assignment. */
12594 /* FIXME: Only done for full arrays for now, since array sections
12596 if (mark == AR_FULL && ref && ref->next == NULL
12597 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12601 if (mpz_cmp (size, values.left) >= 0)
12603 mpz_init_set (range, values.left);
12604 mpz_sub (size, size, values.left);
12605 mpz_set_ui (values.left, 0);
12609 mpz_init_set (range, size);
12610 mpz_sub (values.left, values.left, size);
12611 mpz_set_ui (size, 0);
12614 t = gfc_assign_data_value (var->expr, values.vnode->expr,
12617 mpz_add (offset, offset, range);
12624 /* Assign initial value to symbol. */
12627 mpz_sub_ui (values.left, values.left, 1);
12628 mpz_sub_ui (size, size, 1);
12630 t = gfc_assign_data_value (var->expr, values.vnode->expr,
12635 if (mark == AR_FULL)
12636 mpz_add_ui (offset, offset, 1);
12638 /* Modify the array section indexes and recalculate the offset
12639 for next element. */
12640 else if (mark == AR_SECTION)
12641 gfc_advance_section (section_index, ar, &offset);
12645 if (mark == AR_SECTION)
12647 for (i = 0; i < ar->dimen; i++)
12648 mpz_clear (section_index[i]);
12652 mpz_clear (offset);
12658 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12660 /* Iterate over a list of elements in a DATA statement. */
12663 traverse_data_list (gfc_data_variable *var, locus *where)
12666 iterator_stack frame;
12667 gfc_expr *e, *start, *end, *step;
12668 gfc_try retval = SUCCESS;
12670 mpz_init (frame.value);
12673 start = gfc_copy_expr (var->iter.start);
12674 end = gfc_copy_expr (var->iter.end);
12675 step = gfc_copy_expr (var->iter.step);
12677 if (gfc_simplify_expr (start, 1) == FAILURE
12678 || start->expr_type != EXPR_CONSTANT)
12680 gfc_error ("start of implied-do loop at %L could not be "
12681 "simplified to a constant value", &start->where);
12685 if (gfc_simplify_expr (end, 1) == FAILURE
12686 || end->expr_type != EXPR_CONSTANT)
12688 gfc_error ("end of implied-do loop at %L could not be "
12689 "simplified to a constant value", &start->where);
12693 if (gfc_simplify_expr (step, 1) == FAILURE
12694 || step->expr_type != EXPR_CONSTANT)
12696 gfc_error ("step of implied-do loop at %L could not be "
12697 "simplified to a constant value", &start->where);
12702 mpz_set (trip, end->value.integer);
12703 mpz_sub (trip, trip, start->value.integer);
12704 mpz_add (trip, trip, step->value.integer);
12706 mpz_div (trip, trip, step->value.integer);
12708 mpz_set (frame.value, start->value.integer);
12710 frame.prev = iter_stack;
12711 frame.variable = var->iter.var->symtree;
12712 iter_stack = &frame;
12714 while (mpz_cmp_ui (trip, 0) > 0)
12716 if (traverse_data_var (var->list, where) == FAILURE)
12722 e = gfc_copy_expr (var->expr);
12723 if (gfc_simplify_expr (e, 1) == FAILURE)
12730 mpz_add (frame.value, frame.value, step->value.integer);
12732 mpz_sub_ui (trip, trip, 1);
12736 mpz_clear (frame.value);
12739 gfc_free_expr (start);
12740 gfc_free_expr (end);
12741 gfc_free_expr (step);
12743 iter_stack = frame.prev;
12748 /* Type resolve variables in the variable list of a DATA statement. */
12751 traverse_data_var (gfc_data_variable *var, locus *where)
12755 for (; var; var = var->next)
12757 if (var->expr == NULL)
12758 t = traverse_data_list (var, where);
12760 t = check_data_variable (var, where);
12770 /* Resolve the expressions and iterators associated with a data statement.
12771 This is separate from the assignment checking because data lists should
12772 only be resolved once. */
12775 resolve_data_variables (gfc_data_variable *d)
12777 for (; d; d = d->next)
12779 if (d->list == NULL)
12781 if (gfc_resolve_expr (d->expr) == FAILURE)
12786 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12789 if (resolve_data_variables (d->list) == FAILURE)
12798 /* Resolve a single DATA statement. We implement this by storing a pointer to
12799 the value list into static variables, and then recursively traversing the
12800 variables list, expanding iterators and such. */
12803 resolve_data (gfc_data *d)
12806 if (resolve_data_variables (d->var) == FAILURE)
12809 values.vnode = d->value;
12810 if (d->value == NULL)
12811 mpz_set_ui (values.left, 0);
12813 mpz_set (values.left, d->value->repeat);
12815 if (traverse_data_var (d->var, &d->where) == FAILURE)
12818 /* At this point, we better not have any values left. */
12820 if (next_data_value () == SUCCESS)
12821 gfc_error ("DATA statement at %L has more values than variables",
12826 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12827 accessed by host or use association, is a dummy argument to a pure function,
12828 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12829 is storage associated with any such variable, shall not be used in the
12830 following contexts: (clients of this function). */
12832 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12833 procedure. Returns zero if assignment is OK, nonzero if there is a
12836 gfc_impure_variable (gfc_symbol *sym)
12841 if (sym->attr.use_assoc || sym->attr.in_common)
12844 /* Check if the symbol's ns is inside the pure procedure. */
12845 for (ns = gfc_current_ns; ns; ns = ns->parent)
12849 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12853 proc = sym->ns->proc_name;
12854 if (sym->attr.dummy && gfc_pure (proc)
12855 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12857 proc->attr.function))
12860 /* TODO: Sort out what can be storage associated, if anything, and include
12861 it here. In principle equivalences should be scanned but it does not
12862 seem to be possible to storage associate an impure variable this way. */
12867 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12868 current namespace is inside a pure procedure. */
12871 gfc_pure (gfc_symbol *sym)
12873 symbol_attribute attr;
12878 /* Check if the current namespace or one of its parents
12879 belongs to a pure procedure. */
12880 for (ns = gfc_current_ns; ns; ns = ns->parent)
12882 sym = ns->proc_name;
12886 if (attr.flavor == FL_PROCEDURE && attr.pure)
12894 return attr.flavor == FL_PROCEDURE && attr.pure;
12898 /* Test whether a symbol is implicitly pure or not. For a NULL pointer,
12899 checks if the current namespace is implicitly pure. Note that this
12900 function returns false for a PURE procedure. */
12903 gfc_implicit_pure (gfc_symbol *sym)
12905 symbol_attribute attr;
12909 /* Check if the current namespace is implicit_pure. */
12910 sym = gfc_current_ns->proc_name;
12914 if (attr.flavor == FL_PROCEDURE
12915 && attr.implicit_pure && !attr.pure)
12922 return attr.flavor == FL_PROCEDURE && attr.implicit_pure && !attr.pure;
12926 /* Test whether the current procedure is elemental or not. */
12929 gfc_elemental (gfc_symbol *sym)
12931 symbol_attribute attr;
12934 sym = gfc_current_ns->proc_name;
12939 return attr.flavor == FL_PROCEDURE && attr.elemental;
12943 /* Warn about unused labels. */
12946 warn_unused_fortran_label (gfc_st_label *label)
12951 warn_unused_fortran_label (label->left);
12953 if (label->defined == ST_LABEL_UNKNOWN)
12956 switch (label->referenced)
12958 case ST_LABEL_UNKNOWN:
12959 gfc_warning ("Label %d at %L defined but not used", label->value,
12963 case ST_LABEL_BAD_TARGET:
12964 gfc_warning ("Label %d at %L defined but cannot be used",
12965 label->value, &label->where);
12972 warn_unused_fortran_label (label->right);
12976 /* Returns the sequence type of a symbol or sequence. */
12979 sequence_type (gfc_typespec ts)
12988 if (ts.u.derived->components == NULL)
12989 return SEQ_NONDEFAULT;
12991 result = sequence_type (ts.u.derived->components->ts);
12992 for (c = ts.u.derived->components->next; c; c = c->next)
12993 if (sequence_type (c->ts) != result)
12999 if (ts.kind != gfc_default_character_kind)
13000 return SEQ_NONDEFAULT;
13002 return SEQ_CHARACTER;
13005 if (ts.kind != gfc_default_integer_kind)
13006 return SEQ_NONDEFAULT;
13008 return SEQ_NUMERIC;
13011 if (!(ts.kind == gfc_default_real_kind
13012 || ts.kind == gfc_default_double_kind))
13013 return SEQ_NONDEFAULT;
13015 return SEQ_NUMERIC;
13018 if (ts.kind != gfc_default_complex_kind)
13019 return SEQ_NONDEFAULT;
13021 return SEQ_NUMERIC;
13024 if (ts.kind != gfc_default_logical_kind)
13025 return SEQ_NONDEFAULT;
13027 return SEQ_NUMERIC;
13030 return SEQ_NONDEFAULT;
13035 /* Resolve derived type EQUIVALENCE object. */
13038 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
13040 gfc_component *c = derived->components;
13045 /* Shall not be an object of nonsequence derived type. */
13046 if (!derived->attr.sequence)
13048 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
13049 "attribute to be an EQUIVALENCE object", sym->name,
13054 /* Shall not have allocatable components. */
13055 if (derived->attr.alloc_comp)
13057 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
13058 "components to be an EQUIVALENCE object",sym->name,
13063 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
13065 gfc_error ("Derived type variable '%s' at %L with default "
13066 "initialization cannot be in EQUIVALENCE with a variable "
13067 "in COMMON", sym->name, &e->where);
13071 for (; c ; c = c->next)
13073 if (c->ts.type == BT_DERIVED
13074 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
13077 /* Shall not be an object of sequence derived type containing a pointer
13078 in the structure. */
13079 if (c->attr.pointer)
13081 gfc_error ("Derived type variable '%s' at %L with pointer "
13082 "component(s) cannot be an EQUIVALENCE object",
13083 sym->name, &e->where);
13091 /* Resolve equivalence object.
13092 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
13093 an allocatable array, an object of nonsequence derived type, an object of
13094 sequence derived type containing a pointer at any level of component
13095 selection, an automatic object, a function name, an entry name, a result
13096 name, a named constant, a structure component, or a subobject of any of
13097 the preceding objects. A substring shall not have length zero. A
13098 derived type shall not have components with default initialization nor
13099 shall two objects of an equivalence group be initialized.
13100 Either all or none of the objects shall have an protected attribute.
13101 The simple constraints are done in symbol.c(check_conflict) and the rest
13102 are implemented here. */
13105 resolve_equivalence (gfc_equiv *eq)
13108 gfc_symbol *first_sym;
13111 locus *last_where = NULL;
13112 seq_type eq_type, last_eq_type;
13113 gfc_typespec *last_ts;
13114 int object, cnt_protected;
13117 last_ts = &eq->expr->symtree->n.sym->ts;
13119 first_sym = eq->expr->symtree->n.sym;
13123 for (object = 1; eq; eq = eq->eq, object++)
13127 e->ts = e->symtree->n.sym->ts;
13128 /* match_varspec might not know yet if it is seeing
13129 array reference or substring reference, as it doesn't
13131 if (e->ref && e->ref->type == REF_ARRAY)
13133 gfc_ref *ref = e->ref;
13134 sym = e->symtree->n.sym;
13136 if (sym->attr.dimension)
13138 ref->u.ar.as = sym->as;
13142 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
13143 if (e->ts.type == BT_CHARACTER
13145 && ref->type == REF_ARRAY
13146 && ref->u.ar.dimen == 1
13147 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
13148 && ref->u.ar.stride[0] == NULL)
13150 gfc_expr *start = ref->u.ar.start[0];
13151 gfc_expr *end = ref->u.ar.end[0];
13154 /* Optimize away the (:) reference. */
13155 if (start == NULL && end == NULL)
13158 e->ref = ref->next;
13160 e->ref->next = ref->next;
13165 ref->type = REF_SUBSTRING;
13167 start = gfc_get_int_expr (gfc_default_integer_kind,
13169 ref->u.ss.start = start;
13170 if (end == NULL && e->ts.u.cl)
13171 end = gfc_copy_expr (e->ts.u.cl->length);
13172 ref->u.ss.end = end;
13173 ref->u.ss.length = e->ts.u.cl;
13180 /* Any further ref is an error. */
13183 gcc_assert (ref->type == REF_ARRAY);
13184 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
13190 if (gfc_resolve_expr (e) == FAILURE)
13193 sym = e->symtree->n.sym;
13195 if (sym->attr.is_protected)
13197 if (cnt_protected > 0 && cnt_protected != object)
13199 gfc_error ("Either all or none of the objects in the "
13200 "EQUIVALENCE set at %L shall have the "
13201 "PROTECTED attribute",
13206 /* Shall not equivalence common block variables in a PURE procedure. */
13207 if (sym->ns->proc_name
13208 && sym->ns->proc_name->attr.pure
13209 && sym->attr.in_common)
13211 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
13212 "object in the pure procedure '%s'",
13213 sym->name, &e->where, sym->ns->proc_name->name);
13217 /* Shall not be a named constant. */
13218 if (e->expr_type == EXPR_CONSTANT)
13220 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
13221 "object", sym->name, &e->where);
13225 if (e->ts.type == BT_DERIVED
13226 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
13229 /* Check that the types correspond correctly:
13231 A numeric sequence structure may be equivalenced to another sequence
13232 structure, an object of default integer type, default real type, double
13233 precision real type, default logical type such that components of the
13234 structure ultimately only become associated to objects of the same
13235 kind. A character sequence structure may be equivalenced to an object
13236 of default character kind or another character sequence structure.
13237 Other objects may be equivalenced only to objects of the same type and
13238 kind parameters. */
13240 /* Identical types are unconditionally OK. */
13241 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
13242 goto identical_types;
13244 last_eq_type = sequence_type (*last_ts);
13245 eq_type = sequence_type (sym->ts);
13247 /* Since the pair of objects is not of the same type, mixed or
13248 non-default sequences can be rejected. */
13250 msg = "Sequence %s with mixed components in EQUIVALENCE "
13251 "statement at %L with different type objects";
13253 && last_eq_type == SEQ_MIXED
13254 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
13256 || (eq_type == SEQ_MIXED
13257 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13258 &e->where) == FAILURE))
13261 msg = "Non-default type object or sequence %s in EQUIVALENCE "
13262 "statement at %L with objects of different type";
13264 && last_eq_type == SEQ_NONDEFAULT
13265 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
13266 last_where) == FAILURE)
13267 || (eq_type == SEQ_NONDEFAULT
13268 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13269 &e->where) == FAILURE))
13272 msg ="Non-CHARACTER object '%s' in default CHARACTER "
13273 "EQUIVALENCE statement at %L";
13274 if (last_eq_type == SEQ_CHARACTER
13275 && eq_type != SEQ_CHARACTER
13276 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13277 &e->where) == FAILURE)
13280 msg ="Non-NUMERIC object '%s' in default NUMERIC "
13281 "EQUIVALENCE statement at %L";
13282 if (last_eq_type == SEQ_NUMERIC
13283 && eq_type != SEQ_NUMERIC
13284 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13285 &e->where) == FAILURE)
13290 last_where = &e->where;
13295 /* Shall not be an automatic array. */
13296 if (e->ref->type == REF_ARRAY
13297 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
13299 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
13300 "an EQUIVALENCE object", sym->name, &e->where);
13307 /* Shall not be a structure component. */
13308 if (r->type == REF_COMPONENT)
13310 gfc_error ("Structure component '%s' at %L cannot be an "
13311 "EQUIVALENCE object",
13312 r->u.c.component->name, &e->where);
13316 /* A substring shall not have length zero. */
13317 if (r->type == REF_SUBSTRING)
13319 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
13321 gfc_error ("Substring at %L has length zero",
13322 &r->u.ss.start->where);
13332 /* Resolve function and ENTRY types, issue diagnostics if needed. */
13335 resolve_fntype (gfc_namespace *ns)
13337 gfc_entry_list *el;
13340 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
13343 /* If there are any entries, ns->proc_name is the entry master
13344 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
13346 sym = ns->entries->sym;
13348 sym = ns->proc_name;
13349 if (sym->result == sym
13350 && sym->ts.type == BT_UNKNOWN
13351 && gfc_set_default_type (sym, 0, NULL) == FAILURE
13352 && !sym->attr.untyped)
13354 gfc_error ("Function '%s' at %L has no IMPLICIT type",
13355 sym->name, &sym->declared_at);
13356 sym->attr.untyped = 1;
13359 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
13360 && !sym->attr.contained
13361 && !gfc_check_symbol_access (sym->ts.u.derived)
13362 && gfc_check_symbol_access (sym))
13364 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
13365 "%L of PRIVATE type '%s'", sym->name,
13366 &sym->declared_at, sym->ts.u.derived->name);
13370 for (el = ns->entries->next; el; el = el->next)
13372 if (el->sym->result == el->sym
13373 && el->sym->ts.type == BT_UNKNOWN
13374 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
13375 && !el->sym->attr.untyped)
13377 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
13378 el->sym->name, &el->sym->declared_at);
13379 el->sym->attr.untyped = 1;
13385 /* 12.3.2.1.1 Defined operators. */
13388 check_uop_procedure (gfc_symbol *sym, locus where)
13390 gfc_formal_arglist *formal;
13392 if (!sym->attr.function)
13394 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
13395 sym->name, &where);
13399 if (sym->ts.type == BT_CHARACTER
13400 && !(sym->ts.u.cl && sym->ts.u.cl->length)
13401 && !(sym->result && sym->result->ts.u.cl
13402 && sym->result->ts.u.cl->length))
13404 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
13405 "character length", sym->name, &where);
13409 formal = sym->formal;
13410 if (!formal || !formal->sym)
13412 gfc_error ("User operator procedure '%s' at %L must have at least "
13413 "one argument", sym->name, &where);
13417 if (formal->sym->attr.intent != INTENT_IN)
13419 gfc_error ("First argument of operator interface at %L must be "
13420 "INTENT(IN)", &where);
13424 if (formal->sym->attr.optional)
13426 gfc_error ("First argument of operator interface at %L cannot be "
13427 "optional", &where);
13431 formal = formal->next;
13432 if (!formal || !formal->sym)
13435 if (formal->sym->attr.intent != INTENT_IN)
13437 gfc_error ("Second argument of operator interface at %L must be "
13438 "INTENT(IN)", &where);
13442 if (formal->sym->attr.optional)
13444 gfc_error ("Second argument of operator interface at %L cannot be "
13445 "optional", &where);
13451 gfc_error ("Operator interface at %L must have, at most, two "
13452 "arguments", &where);
13460 gfc_resolve_uops (gfc_symtree *symtree)
13462 gfc_interface *itr;
13464 if (symtree == NULL)
13467 gfc_resolve_uops (symtree->left);
13468 gfc_resolve_uops (symtree->right);
13470 for (itr = symtree->n.uop->op; itr; itr = itr->next)
13471 check_uop_procedure (itr->sym, itr->sym->declared_at);
13475 /* Examine all of the expressions associated with a program unit,
13476 assign types to all intermediate expressions, make sure that all
13477 assignments are to compatible types and figure out which names
13478 refer to which functions or subroutines. It doesn't check code
13479 block, which is handled by resolve_code. */
13482 resolve_types (gfc_namespace *ns)
13488 gfc_namespace* old_ns = gfc_current_ns;
13490 /* Check that all IMPLICIT types are ok. */
13491 if (!ns->seen_implicit_none)
13494 for (letter = 0; letter != GFC_LETTERS; ++letter)
13495 if (ns->set_flag[letter]
13496 && resolve_typespec_used (&ns->default_type[letter],
13497 &ns->implicit_loc[letter],
13502 gfc_current_ns = ns;
13504 resolve_entries (ns);
13506 resolve_common_vars (ns->blank_common.head, false);
13507 resolve_common_blocks (ns->common_root);
13509 resolve_contained_functions (ns);
13511 if (ns->proc_name && ns->proc_name->attr.flavor == FL_PROCEDURE
13512 && ns->proc_name->attr.if_source == IFSRC_IFBODY)
13513 resolve_formal_arglist (ns->proc_name);
13515 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
13517 for (cl = ns->cl_list; cl; cl = cl->next)
13518 resolve_charlen (cl);
13520 gfc_traverse_ns (ns, resolve_symbol);
13522 resolve_fntype (ns);
13524 for (n = ns->contained; n; n = n->sibling)
13526 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
13527 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
13528 "also be PURE", n->proc_name->name,
13529 &n->proc_name->declared_at);
13535 gfc_check_interfaces (ns);
13537 gfc_traverse_ns (ns, resolve_values);
13543 for (d = ns->data; d; d = d->next)
13547 gfc_traverse_ns (ns, gfc_formalize_init_value);
13549 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13551 if (ns->common_root != NULL)
13552 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13554 for (eq = ns->equiv; eq; eq = eq->next)
13555 resolve_equivalence (eq);
13557 /* Warn about unused labels. */
13558 if (warn_unused_label)
13559 warn_unused_fortran_label (ns->st_labels);
13561 gfc_resolve_uops (ns->uop_root);
13563 gfc_current_ns = old_ns;
13567 /* Call resolve_code recursively. */
13570 resolve_codes (gfc_namespace *ns)
13573 bitmap_obstack old_obstack;
13575 if (ns->resolved == 1)
13578 for (n = ns->contained; n; n = n->sibling)
13581 gfc_current_ns = ns;
13583 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13584 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13587 /* Set to an out of range value. */
13588 current_entry_id = -1;
13590 old_obstack = labels_obstack;
13591 bitmap_obstack_initialize (&labels_obstack);
13593 resolve_code (ns->code, ns);
13595 bitmap_obstack_release (&labels_obstack);
13596 labels_obstack = old_obstack;
13600 /* This function is called after a complete program unit has been compiled.
13601 Its purpose is to examine all of the expressions associated with a program
13602 unit, assign types to all intermediate expressions, make sure that all
13603 assignments are to compatible types and figure out which names refer to
13604 which functions or subroutines. */
13607 gfc_resolve (gfc_namespace *ns)
13609 gfc_namespace *old_ns;
13610 code_stack *old_cs_base;
13616 old_ns = gfc_current_ns;
13617 old_cs_base = cs_base;
13619 resolve_types (ns);
13620 resolve_codes (ns);
13622 gfc_current_ns = old_ns;
13623 cs_base = old_cs_base;
13626 gfc_run_passes (ns);