1 /* Perform type resolution on the various structures.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
29 #include "arith.h" /* For gfc_compare_expr(). */
30 #include "dependency.h"
32 #include "target-memory.h" /* for gfc_simplify_transfer */
33 #include "constructor.h"
35 /* Types used in equivalence statements. */
39 SEQ_NONDEFAULT, SEQ_NUMERIC, SEQ_CHARACTER, SEQ_MIXED
43 /* Stack to keep track of the nesting of blocks as we move through the
44 code. See resolve_branch() and resolve_code(). */
46 typedef struct code_stack
48 struct gfc_code *head, *current;
49 struct code_stack *prev;
51 /* This bitmap keeps track of the targets valid for a branch from
52 inside this block except for END {IF|SELECT}s of enclosing
54 bitmap reachable_labels;
58 static code_stack *cs_base = NULL;
61 /* Nonzero if we're inside a FORALL block. */
63 static int forall_flag;
65 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
67 static int omp_workshare_flag;
69 /* Nonzero if we are processing a formal arglist. The corresponding function
70 resets the flag each time that it is read. */
71 static int formal_arg_flag = 0;
73 /* True if we are resolving a specification expression. */
74 static int specification_expr = 0;
76 /* The id of the last entry seen. */
77 static int current_entry_id;
79 /* We use bitmaps to determine if a branch target is valid. */
80 static bitmap_obstack labels_obstack;
82 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
83 static bool inquiry_argument = false;
86 gfc_is_formal_arg (void)
88 return formal_arg_flag;
91 /* Is the symbol host associated? */
93 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
95 for (ns = ns->parent; ns; ns = ns->parent)
104 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
105 an ABSTRACT derived-type. If where is not NULL, an error message with that
106 locus is printed, optionally using name. */
109 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
111 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
116 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
117 name, where, ts->u.derived->name);
119 gfc_error ("ABSTRACT type '%s' used at %L",
120 ts->u.derived->name, where);
130 static void resolve_symbol (gfc_symbol *sym);
131 static gfc_try resolve_intrinsic (gfc_symbol *sym, locus *loc);
134 /* Resolve the interface for a PROCEDURE declaration or procedure pointer. */
137 resolve_procedure_interface (gfc_symbol *sym)
139 if (sym->ts.interface == sym)
141 gfc_error ("PROCEDURE '%s' at %L may not be used as its own interface",
142 sym->name, &sym->declared_at);
145 if (sym->ts.interface->attr.procedure)
147 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared "
148 "in a later PROCEDURE statement", sym->ts.interface->name,
149 sym->name, &sym->declared_at);
153 /* Get the attributes from the interface (now resolved). */
154 if (sym->ts.interface->attr.if_source || sym->ts.interface->attr.intrinsic)
156 gfc_symbol *ifc = sym->ts.interface;
157 resolve_symbol (ifc);
159 if (ifc->attr.intrinsic)
160 resolve_intrinsic (ifc, &ifc->declared_at);
164 sym->ts = ifc->result->ts;
169 sym->ts.interface = ifc;
170 sym->attr.function = ifc->attr.function;
171 sym->attr.subroutine = ifc->attr.subroutine;
172 gfc_copy_formal_args (sym, ifc);
174 sym->attr.allocatable = ifc->attr.allocatable;
175 sym->attr.pointer = ifc->attr.pointer;
176 sym->attr.pure = ifc->attr.pure;
177 sym->attr.elemental = ifc->attr.elemental;
178 sym->attr.dimension = ifc->attr.dimension;
179 sym->attr.contiguous = ifc->attr.contiguous;
180 sym->attr.recursive = ifc->attr.recursive;
181 sym->attr.always_explicit = ifc->attr.always_explicit;
182 sym->attr.ext_attr |= ifc->attr.ext_attr;
183 sym->attr.is_bind_c = ifc->attr.is_bind_c;
184 /* Copy array spec. */
185 sym->as = gfc_copy_array_spec (ifc->as);
189 for (i = 0; i < sym->as->rank; i++)
191 gfc_expr_replace_symbols (sym->as->lower[i], sym);
192 gfc_expr_replace_symbols (sym->as->upper[i], sym);
195 /* Copy char length. */
196 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
198 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
199 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
200 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
201 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
205 else if (sym->ts.interface->name[0] != '\0')
207 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
208 sym->ts.interface->name, sym->name, &sym->declared_at);
216 /* Resolve types of formal argument lists. These have to be done early so that
217 the formal argument lists of module procedures can be copied to the
218 containing module before the individual procedures are resolved
219 individually. We also resolve argument lists of procedures in interface
220 blocks because they are self-contained scoping units.
222 Since a dummy argument cannot be a non-dummy procedure, the only
223 resort left for untyped names are the IMPLICIT types. */
226 resolve_formal_arglist (gfc_symbol *proc)
228 gfc_formal_arglist *f;
232 if (proc->result != NULL)
237 if (gfc_elemental (proc)
238 || sym->attr.pointer || sym->attr.allocatable
239 || (sym->as && sym->as->rank > 0))
241 proc->attr.always_explicit = 1;
242 sym->attr.always_explicit = 1;
247 for (f = proc->formal; f; f = f->next)
253 /* Alternate return placeholder. */
254 if (gfc_elemental (proc))
255 gfc_error ("Alternate return specifier in elemental subroutine "
256 "'%s' at %L is not allowed", proc->name,
258 if (proc->attr.function)
259 gfc_error ("Alternate return specifier in function "
260 "'%s' at %L is not allowed", proc->name,
264 else if (sym->attr.procedure && sym->ts.interface
265 && sym->attr.if_source != IFSRC_DECL)
266 resolve_procedure_interface (sym);
268 if (sym->attr.if_source != IFSRC_UNKNOWN)
269 resolve_formal_arglist (sym);
271 if (sym->attr.subroutine || sym->attr.external || sym->attr.intrinsic)
273 if (gfc_pure (proc) && !gfc_pure (sym))
275 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
276 "also be PURE", sym->name, &sym->declared_at);
280 if (proc->attr.implicit_pure && !gfc_pure(sym))
281 proc->attr.implicit_pure = 0;
283 if (gfc_elemental (proc))
285 gfc_error ("Dummy procedure at %L not allowed in ELEMENTAL "
286 "procedure", &sym->declared_at);
290 if (sym->attr.function
291 && sym->ts.type == BT_UNKNOWN
292 && sym->attr.intrinsic)
294 gfc_intrinsic_sym *isym;
295 isym = gfc_find_function (sym->name);
296 if (isym == NULL || !isym->specific)
298 gfc_error ("Unable to find a specific INTRINSIC procedure "
299 "for the reference '%s' at %L", sym->name,
308 if (sym->ts.type == BT_UNKNOWN && !proc->attr.intrinsic
309 && (!sym->attr.function || sym->result == sym))
310 gfc_set_default_type (sym, 1, sym->ns);
312 gfc_resolve_array_spec (sym->as, 0);
314 /* We can't tell if an array with dimension (:) is assumed or deferred
315 shape until we know if it has the pointer or allocatable attributes.
317 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
318 && !(sym->attr.pointer || sym->attr.allocatable)
319 && sym->attr.flavor != FL_PROCEDURE)
321 sym->as->type = AS_ASSUMED_SHAPE;
322 for (i = 0; i < sym->as->rank; i++)
323 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
327 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
328 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
329 || sym->attr.optional)
331 proc->attr.always_explicit = 1;
333 proc->result->attr.always_explicit = 1;
336 /* If the flavor is unknown at this point, it has to be a variable.
337 A procedure specification would have already set the type. */
339 if (sym->attr.flavor == FL_UNKNOWN)
340 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
342 if (gfc_pure (proc) && !sym->attr.pointer
343 && sym->attr.flavor != FL_PROCEDURE)
345 if (proc->attr.function && sym->attr.intent != INTENT_IN)
348 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
349 "of pure function '%s' at %L with VALUE "
350 "attribute but without INTENT(IN)", sym->name,
351 proc->name, &sym->declared_at);
353 gfc_error ("Argument '%s' of pure function '%s' at %L must be "
354 "INTENT(IN) or VALUE", sym->name, proc->name,
358 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
361 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s' "
362 "of pure subroutine '%s' at %L with VALUE "
363 "attribute but without INTENT", sym->name,
364 proc->name, &sym->declared_at);
366 gfc_error ("Argument '%s' of pure subroutine '%s' at %L must "
367 "have its INTENT specified or have the VALUE "
368 "attribute", sym->name, proc->name, &sym->declared_at);
372 if (proc->attr.implicit_pure && !sym->attr.pointer
373 && sym->attr.flavor != FL_PROCEDURE)
375 if (proc->attr.function && sym->attr.intent != INTENT_IN)
376 proc->attr.implicit_pure = 0;
378 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
379 proc->attr.implicit_pure = 0;
382 if (gfc_elemental (proc))
385 if (sym->attr.codimension)
387 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
388 "procedure", sym->name, &sym->declared_at);
394 gfc_error ("Argument '%s' of elemental procedure at %L must "
395 "be scalar", sym->name, &sym->declared_at);
399 if (sym->attr.allocatable)
401 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
402 "have the ALLOCATABLE attribute", sym->name,
407 if (sym->attr.pointer)
409 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
410 "have the POINTER attribute", sym->name,
415 if (sym->attr.flavor == FL_PROCEDURE)
417 gfc_error ("Dummy procedure '%s' not allowed in elemental "
418 "procedure '%s' at %L", sym->name, proc->name,
423 if (sym->attr.intent == INTENT_UNKNOWN)
425 gfc_error ("Argument '%s' of elemental procedure '%s' at %L must "
426 "have its INTENT specified", sym->name, proc->name,
432 /* Each dummy shall be specified to be scalar. */
433 if (proc->attr.proc == PROC_ST_FUNCTION)
437 gfc_error ("Argument '%s' of statement function at %L must "
438 "be scalar", sym->name, &sym->declared_at);
442 if (sym->ts.type == BT_CHARACTER)
444 gfc_charlen *cl = sym->ts.u.cl;
445 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
447 gfc_error ("Character-valued argument '%s' of statement "
448 "function at %L must have constant length",
449 sym->name, &sym->declared_at);
459 /* Work function called when searching for symbols that have argument lists
460 associated with them. */
463 find_arglists (gfc_symbol *sym)
465 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
468 resolve_formal_arglist (sym);
472 /* Given a namespace, resolve all formal argument lists within the namespace.
476 resolve_formal_arglists (gfc_namespace *ns)
481 gfc_traverse_ns (ns, find_arglists);
486 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
490 /* If this namespace is not a function or an entry master function,
492 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
493 || sym->attr.entry_master)
496 /* Try to find out of what the return type is. */
497 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
499 t = gfc_set_default_type (sym->result, 0, ns);
501 if (t == FAILURE && !sym->result->attr.untyped)
503 if (sym->result == sym)
504 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
505 sym->name, &sym->declared_at);
506 else if (!sym->result->attr.proc_pointer)
507 gfc_error ("Result '%s' of contained function '%s' at %L has "
508 "no IMPLICIT type", sym->result->name, sym->name,
509 &sym->result->declared_at);
510 sym->result->attr.untyped = 1;
514 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
515 type, lists the only ways a character length value of * can be used:
516 dummy arguments of procedures, named constants, and function results
517 in external functions. Internal function results and results of module
518 procedures are not on this list, ergo, not permitted. */
520 if (sym->result->ts.type == BT_CHARACTER)
522 gfc_charlen *cl = sym->result->ts.u.cl;
523 if ((!cl || !cl->length) && !sym->result->ts.deferred)
525 /* See if this is a module-procedure and adapt error message
528 gcc_assert (ns->parent && ns->parent->proc_name);
529 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
531 gfc_error ("Character-valued %s '%s' at %L must not be"
533 module_proc ? _("module procedure")
534 : _("internal function"),
535 sym->name, &sym->declared_at);
541 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
542 introduce duplicates. */
545 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
547 gfc_formal_arglist *f, *new_arglist;
550 for (; new_args != NULL; new_args = new_args->next)
552 new_sym = new_args->sym;
553 /* See if this arg is already in the formal argument list. */
554 for (f = proc->formal; f; f = f->next)
556 if (new_sym == f->sym)
563 /* Add a new argument. Argument order is not important. */
564 new_arglist = gfc_get_formal_arglist ();
565 new_arglist->sym = new_sym;
566 new_arglist->next = proc->formal;
567 proc->formal = new_arglist;
572 /* Flag the arguments that are not present in all entries. */
575 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
577 gfc_formal_arglist *f, *head;
580 for (f = proc->formal; f; f = f->next)
585 for (new_args = head; new_args; new_args = new_args->next)
587 if (new_args->sym == f->sym)
594 f->sym->attr.not_always_present = 1;
599 /* Resolve alternate entry points. If a symbol has multiple entry points we
600 create a new master symbol for the main routine, and turn the existing
601 symbol into an entry point. */
604 resolve_entries (gfc_namespace *ns)
606 gfc_namespace *old_ns;
610 char name[GFC_MAX_SYMBOL_LEN + 1];
611 static int master_count = 0;
613 if (ns->proc_name == NULL)
616 /* No need to do anything if this procedure doesn't have alternate entry
621 /* We may already have resolved alternate entry points. */
622 if (ns->proc_name->attr.entry_master)
625 /* If this isn't a procedure something has gone horribly wrong. */
626 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
628 /* Remember the current namespace. */
629 old_ns = gfc_current_ns;
633 /* Add the main entry point to the list of entry points. */
634 el = gfc_get_entry_list ();
635 el->sym = ns->proc_name;
637 el->next = ns->entries;
639 ns->proc_name->attr.entry = 1;
641 /* If it is a module function, it needs to be in the right namespace
642 so that gfc_get_fake_result_decl can gather up the results. The
643 need for this arose in get_proc_name, where these beasts were
644 left in their own namespace, to keep prior references linked to
645 the entry declaration.*/
646 if (ns->proc_name->attr.function
647 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
650 /* Do the same for entries where the master is not a module
651 procedure. These are retained in the module namespace because
652 of the module procedure declaration. */
653 for (el = el->next; el; el = el->next)
654 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
655 && el->sym->attr.mod_proc)
659 /* Add an entry statement for it. */
666 /* Create a new symbol for the master function. */
667 /* Give the internal function a unique name (within this file).
668 Also include the function name so the user has some hope of figuring
669 out what is going on. */
670 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
671 master_count++, ns->proc_name->name);
672 gfc_get_ha_symbol (name, &proc);
673 gcc_assert (proc != NULL);
675 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
676 if (ns->proc_name->attr.subroutine)
677 gfc_add_subroutine (&proc->attr, proc->name, NULL);
681 gfc_typespec *ts, *fts;
682 gfc_array_spec *as, *fas;
683 gfc_add_function (&proc->attr, proc->name, NULL);
685 fas = ns->entries->sym->as;
686 fas = fas ? fas : ns->entries->sym->result->as;
687 fts = &ns->entries->sym->result->ts;
688 if (fts->type == BT_UNKNOWN)
689 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
690 for (el = ns->entries->next; el; el = el->next)
692 ts = &el->sym->result->ts;
694 as = as ? as : el->sym->result->as;
695 if (ts->type == BT_UNKNOWN)
696 ts = gfc_get_default_type (el->sym->result->name, NULL);
698 if (! gfc_compare_types (ts, fts)
699 || (el->sym->result->attr.dimension
700 != ns->entries->sym->result->attr.dimension)
701 || (el->sym->result->attr.pointer
702 != ns->entries->sym->result->attr.pointer))
704 else if (as && fas && ns->entries->sym->result != el->sym->result
705 && gfc_compare_array_spec (as, fas) == 0)
706 gfc_error ("Function %s at %L has entries with mismatched "
707 "array specifications", ns->entries->sym->name,
708 &ns->entries->sym->declared_at);
709 /* The characteristics need to match and thus both need to have
710 the same string length, i.e. both len=*, or both len=4.
711 Having both len=<variable> is also possible, but difficult to
712 check at compile time. */
713 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
714 && (((ts->u.cl->length && !fts->u.cl->length)
715 ||(!ts->u.cl->length && fts->u.cl->length))
717 && ts->u.cl->length->expr_type
718 != fts->u.cl->length->expr_type)
720 && ts->u.cl->length->expr_type == EXPR_CONSTANT
721 && mpz_cmp (ts->u.cl->length->value.integer,
722 fts->u.cl->length->value.integer) != 0)))
723 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
724 "entries returning variables of different "
725 "string lengths", ns->entries->sym->name,
726 &ns->entries->sym->declared_at);
731 sym = ns->entries->sym->result;
732 /* All result types the same. */
734 if (sym->attr.dimension)
735 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
736 if (sym->attr.pointer)
737 gfc_add_pointer (&proc->attr, NULL);
741 /* Otherwise the result will be passed through a union by
743 proc->attr.mixed_entry_master = 1;
744 for (el = ns->entries; el; el = el->next)
746 sym = el->sym->result;
747 if (sym->attr.dimension)
749 if (el == ns->entries)
750 gfc_error ("FUNCTION result %s can't be an array in "
751 "FUNCTION %s at %L", sym->name,
752 ns->entries->sym->name, &sym->declared_at);
754 gfc_error ("ENTRY result %s can't be an array in "
755 "FUNCTION %s at %L", sym->name,
756 ns->entries->sym->name, &sym->declared_at);
758 else if (sym->attr.pointer)
760 if (el == ns->entries)
761 gfc_error ("FUNCTION result %s can't be a POINTER in "
762 "FUNCTION %s at %L", sym->name,
763 ns->entries->sym->name, &sym->declared_at);
765 gfc_error ("ENTRY result %s can't be a POINTER in "
766 "FUNCTION %s at %L", sym->name,
767 ns->entries->sym->name, &sym->declared_at);
772 if (ts->type == BT_UNKNOWN)
773 ts = gfc_get_default_type (sym->name, NULL);
777 if (ts->kind == gfc_default_integer_kind)
781 if (ts->kind == gfc_default_real_kind
782 || ts->kind == gfc_default_double_kind)
786 if (ts->kind == gfc_default_complex_kind)
790 if (ts->kind == gfc_default_logical_kind)
794 /* We will issue error elsewhere. */
802 if (el == ns->entries)
803 gfc_error ("FUNCTION result %s can't be of type %s "
804 "in FUNCTION %s at %L", sym->name,
805 gfc_typename (ts), ns->entries->sym->name,
808 gfc_error ("ENTRY result %s can't be of type %s "
809 "in FUNCTION %s at %L", sym->name,
810 gfc_typename (ts), ns->entries->sym->name,
817 proc->attr.access = ACCESS_PRIVATE;
818 proc->attr.entry_master = 1;
820 /* Merge all the entry point arguments. */
821 for (el = ns->entries; el; el = el->next)
822 merge_argument_lists (proc, el->sym->formal);
824 /* Check the master formal arguments for any that are not
825 present in all entry points. */
826 for (el = ns->entries; el; el = el->next)
827 check_argument_lists (proc, el->sym->formal);
829 /* Use the master function for the function body. */
830 ns->proc_name = proc;
832 /* Finalize the new symbols. */
833 gfc_commit_symbols ();
835 /* Restore the original namespace. */
836 gfc_current_ns = old_ns;
840 /* Resolve common variables. */
842 resolve_common_vars (gfc_symbol *sym, bool named_common)
844 gfc_symbol *csym = sym;
846 for (; csym; csym = csym->common_next)
848 if (csym->value || csym->attr.data)
850 if (!csym->ns->is_block_data)
851 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
852 "but only in BLOCK DATA initialization is "
853 "allowed", csym->name, &csym->declared_at);
854 else if (!named_common)
855 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
856 "in a blank COMMON but initialization is only "
857 "allowed in named common blocks", csym->name,
861 if (csym->ts.type != BT_DERIVED)
864 if (!(csym->ts.u.derived->attr.sequence
865 || csym->ts.u.derived->attr.is_bind_c))
866 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
867 "has neither the SEQUENCE nor the BIND(C) "
868 "attribute", csym->name, &csym->declared_at);
869 if (csym->ts.u.derived->attr.alloc_comp)
870 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
871 "has an ultimate component that is "
872 "allocatable", csym->name, &csym->declared_at);
873 if (gfc_has_default_initializer (csym->ts.u.derived))
874 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
875 "may not have default initializer", csym->name,
878 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
879 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
883 /* Resolve common blocks. */
885 resolve_common_blocks (gfc_symtree *common_root)
889 if (common_root == NULL)
892 if (common_root->left)
893 resolve_common_blocks (common_root->left);
894 if (common_root->right)
895 resolve_common_blocks (common_root->right);
897 resolve_common_vars (common_root->n.common->head, true);
899 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
903 if (sym->attr.flavor == FL_PARAMETER)
904 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
905 sym->name, &common_root->n.common->where, &sym->declared_at);
907 if (sym->attr.intrinsic)
908 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
909 sym->name, &common_root->n.common->where);
910 else if (sym->attr.result
911 || gfc_is_function_return_value (sym, gfc_current_ns))
912 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
913 "that is also a function result", sym->name,
914 &common_root->n.common->where);
915 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
916 && sym->attr.proc != PROC_ST_FUNCTION)
917 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
918 "that is also a global procedure", sym->name,
919 &common_root->n.common->where);
923 /* Resolve contained function types. Because contained functions can call one
924 another, they have to be worked out before any of the contained procedures
927 The good news is that if a function doesn't already have a type, the only
928 way it can get one is through an IMPLICIT type or a RESULT variable, because
929 by definition contained functions are contained namespace they're contained
930 in, not in a sibling or parent namespace. */
933 resolve_contained_functions (gfc_namespace *ns)
935 gfc_namespace *child;
938 resolve_formal_arglists (ns);
940 for (child = ns->contained; child; child = child->sibling)
942 /* Resolve alternate entry points first. */
943 resolve_entries (child);
945 /* Then check function return types. */
946 resolve_contained_fntype (child->proc_name, child);
947 for (el = child->entries; el; el = el->next)
948 resolve_contained_fntype (el->sym, child);
953 /* Resolve all of the elements of a structure constructor and make sure that
954 the types are correct. The 'init' flag indicates that the given
955 constructor is an initializer. */
958 resolve_structure_cons (gfc_expr *expr, int init)
960 gfc_constructor *cons;
967 if (expr->ts.type == BT_DERIVED)
968 resolve_symbol (expr->ts.u.derived);
970 cons = gfc_constructor_first (expr->value.constructor);
971 /* A constructor may have references if it is the result of substituting a
972 parameter variable. In this case we just pull out the component we
975 comp = expr->ref->u.c.sym->components;
977 comp = expr->ts.u.derived->components;
979 /* See if the user is trying to invoke a structure constructor for one of
980 the iso_c_binding derived types. */
981 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
982 && expr->ts.u.derived->ts.is_iso_c && cons
983 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
985 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
986 expr->ts.u.derived->name, &(expr->where));
990 /* Return if structure constructor is c_null_(fun)prt. */
991 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
992 && expr->ts.u.derived->ts.is_iso_c && cons
993 && cons->expr && cons->expr->expr_type == EXPR_NULL)
996 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
1003 if (gfc_resolve_expr (cons->expr) == FAILURE)
1009 rank = comp->as ? comp->as->rank : 0;
1010 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
1011 && (comp->attr.allocatable || cons->expr->rank))
1013 gfc_error ("The rank of the element in the derived type "
1014 "constructor at %L does not match that of the "
1015 "component (%d/%d)", &cons->expr->where,
1016 cons->expr->rank, rank);
1020 /* If we don't have the right type, try to convert it. */
1022 if (!comp->attr.proc_pointer &&
1023 !gfc_compare_types (&cons->expr->ts, &comp->ts))
1026 if (strcmp (comp->name, "_extends") == 0)
1028 /* Can afford to be brutal with the _extends initializer.
1029 The derived type can get lost because it is PRIVATE
1030 but it is not usage constrained by the standard. */
1031 cons->expr->ts = comp->ts;
1034 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
1035 gfc_error ("The element in the derived type constructor at %L, "
1036 "for pointer component '%s', is %s but should be %s",
1037 &cons->expr->where, comp->name,
1038 gfc_basic_typename (cons->expr->ts.type),
1039 gfc_basic_typename (comp->ts.type));
1041 t = gfc_convert_type (cons->expr, &comp->ts, 1);
1044 /* For strings, the length of the constructor should be the same as
1045 the one of the structure, ensure this if the lengths are known at
1046 compile time and when we are dealing with PARAMETER or structure
1048 if (cons->expr->ts.type == BT_CHARACTER && comp->ts.u.cl
1049 && comp->ts.u.cl->length
1050 && comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
1051 && cons->expr->ts.u.cl && cons->expr->ts.u.cl->length
1052 && cons->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
1053 && mpz_cmp (cons->expr->ts.u.cl->length->value.integer,
1054 comp->ts.u.cl->length->value.integer) != 0)
1056 if (cons->expr->expr_type == EXPR_VARIABLE
1057 && cons->expr->symtree->n.sym->attr.flavor == FL_PARAMETER)
1059 /* Wrap the parameter in an array constructor (EXPR_ARRAY)
1060 to make use of the gfc_resolve_character_array_constructor
1061 machinery. The expression is later simplified away to
1062 an array of string literals. */
1063 gfc_expr *para = cons->expr;
1064 cons->expr = gfc_get_expr ();
1065 cons->expr->ts = para->ts;
1066 cons->expr->where = para->where;
1067 cons->expr->expr_type = EXPR_ARRAY;
1068 cons->expr->rank = para->rank;
1069 cons->expr->shape = gfc_copy_shape (para->shape, para->rank);
1070 gfc_constructor_append_expr (&cons->expr->value.constructor,
1071 para, &cons->expr->where);
1073 if (cons->expr->expr_type == EXPR_ARRAY)
1076 p = gfc_constructor_first (cons->expr->value.constructor);
1077 if (cons->expr->ts.u.cl != p->expr->ts.u.cl)
1079 gfc_charlen *cl, *cl2;
1082 for (cl = gfc_current_ns->cl_list; cl; cl = cl->next)
1084 if (cl == cons->expr->ts.u.cl)
1092 cl2->next = cl->next;
1094 gfc_free_expr (cl->length);
1098 cons->expr->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1099 cons->expr->ts.u.cl->length_from_typespec = true;
1100 cons->expr->ts.u.cl->length = gfc_copy_expr (comp->ts.u.cl->length);
1101 gfc_resolve_character_array_constructor (cons->expr);
1105 if (cons->expr->expr_type == EXPR_NULL
1106 && !(comp->attr.pointer || comp->attr.allocatable
1107 || comp->attr.proc_pointer
1108 || (comp->ts.type == BT_CLASS
1109 && (CLASS_DATA (comp)->attr.class_pointer
1110 || CLASS_DATA (comp)->attr.allocatable))))
1113 gfc_error ("The NULL in the derived type constructor at %L is "
1114 "being applied to component '%s', which is neither "
1115 "a POINTER nor ALLOCATABLE", &cons->expr->where,
1119 if (!comp->attr.pointer || comp->attr.proc_pointer
1120 || cons->expr->expr_type == EXPR_NULL)
1123 a = gfc_expr_attr (cons->expr);
1125 if (!a.pointer && !a.target)
1128 gfc_error ("The element in the derived type constructor at %L, "
1129 "for pointer component '%s' should be a POINTER or "
1130 "a TARGET", &cons->expr->where, comp->name);
1135 /* F08:C461. Additional checks for pointer initialization. */
1139 gfc_error ("Pointer initialization target at %L "
1140 "must not be ALLOCATABLE ", &cons->expr->where);
1145 gfc_error ("Pointer initialization target at %L "
1146 "must have the SAVE attribute", &cons->expr->where);
1150 /* F2003, C1272 (3). */
1151 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
1152 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1153 || gfc_is_coindexed (cons->expr)))
1156 gfc_error ("Invalid expression in the derived type constructor for "
1157 "pointer component '%s' at %L in PURE procedure",
1158 comp->name, &cons->expr->where);
1161 if (gfc_implicit_pure (NULL)
1162 && cons->expr->expr_type == EXPR_VARIABLE
1163 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1164 || gfc_is_coindexed (cons->expr)))
1165 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1173 /****************** Expression name resolution ******************/
1175 /* Returns 0 if a symbol was not declared with a type or
1176 attribute declaration statement, nonzero otherwise. */
1179 was_declared (gfc_symbol *sym)
1185 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
1188 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
1189 || a.optional || a.pointer || a.save || a.target || a.volatile_
1190 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
1191 || a.asynchronous || a.codimension)
1198 /* Determine if a symbol is generic or not. */
1201 generic_sym (gfc_symbol *sym)
1205 if (sym->attr.generic ||
1206 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
1209 if (was_declared (sym) || sym->ns->parent == NULL)
1212 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1219 return generic_sym (s);
1226 /* Determine if a symbol is specific or not. */
1229 specific_sym (gfc_symbol *sym)
1233 if (sym->attr.if_source == IFSRC_IFBODY
1234 || sym->attr.proc == PROC_MODULE
1235 || sym->attr.proc == PROC_INTERNAL
1236 || sym->attr.proc == PROC_ST_FUNCTION
1237 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1238 || sym->attr.external)
1241 if (was_declared (sym) || sym->ns->parent == NULL)
1244 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1246 return (s == NULL) ? 0 : specific_sym (s);
1250 /* Figure out if the procedure is specific, generic or unknown. */
1253 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1257 procedure_kind (gfc_symbol *sym)
1259 if (generic_sym (sym))
1260 return PTYPE_GENERIC;
1262 if (specific_sym (sym))
1263 return PTYPE_SPECIFIC;
1265 return PTYPE_UNKNOWN;
1268 /* Check references to assumed size arrays. The flag need_full_assumed_size
1269 is nonzero when matching actual arguments. */
1271 static int need_full_assumed_size = 0;
1274 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1276 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1279 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1280 What should it be? */
1281 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1282 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1283 && (e->ref->u.ar.type == AR_FULL))
1285 gfc_error ("The upper bound in the last dimension must "
1286 "appear in the reference to the assumed size "
1287 "array '%s' at %L", sym->name, &e->where);
1294 /* Look for bad assumed size array references in argument expressions
1295 of elemental and array valued intrinsic procedures. Since this is
1296 called from procedure resolution functions, it only recurses at
1300 resolve_assumed_size_actual (gfc_expr *e)
1305 switch (e->expr_type)
1308 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1313 if (resolve_assumed_size_actual (e->value.op.op1)
1314 || resolve_assumed_size_actual (e->value.op.op2))
1325 /* Check a generic procedure, passed as an actual argument, to see if
1326 there is a matching specific name. If none, it is an error, and if
1327 more than one, the reference is ambiguous. */
1329 count_specific_procs (gfc_expr *e)
1336 sym = e->symtree->n.sym;
1338 for (p = sym->generic; p; p = p->next)
1339 if (strcmp (sym->name, p->sym->name) == 0)
1341 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1347 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1351 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1352 "argument at %L", sym->name, &e->where);
1358 /* See if a call to sym could possibly be a not allowed RECURSION because of
1359 a missing RECURIVE declaration. This means that either sym is the current
1360 context itself, or sym is the parent of a contained procedure calling its
1361 non-RECURSIVE containing procedure.
1362 This also works if sym is an ENTRY. */
1365 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1367 gfc_symbol* proc_sym;
1368 gfc_symbol* context_proc;
1369 gfc_namespace* real_context;
1371 if (sym->attr.flavor == FL_PROGRAM)
1374 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1376 /* If we've got an ENTRY, find real procedure. */
1377 if (sym->attr.entry && sym->ns->entries)
1378 proc_sym = sym->ns->entries->sym;
1382 /* If sym is RECURSIVE, all is well of course. */
1383 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1386 /* Find the context procedure's "real" symbol if it has entries.
1387 We look for a procedure symbol, so recurse on the parents if we don't
1388 find one (like in case of a BLOCK construct). */
1389 for (real_context = context; ; real_context = real_context->parent)
1391 /* We should find something, eventually! */
1392 gcc_assert (real_context);
1394 context_proc = (real_context->entries ? real_context->entries->sym
1395 : real_context->proc_name);
1397 /* In some special cases, there may not be a proc_name, like for this
1399 real(bad_kind()) function foo () ...
1400 when checking the call to bad_kind ().
1401 In these cases, we simply return here and assume that the
1406 if (context_proc->attr.flavor != FL_LABEL)
1410 /* A call from sym's body to itself is recursion, of course. */
1411 if (context_proc == proc_sym)
1414 /* The same is true if context is a contained procedure and sym the
1416 if (context_proc->attr.contained)
1418 gfc_symbol* parent_proc;
1420 gcc_assert (context->parent);
1421 parent_proc = (context->parent->entries ? context->parent->entries->sym
1422 : context->parent->proc_name);
1424 if (parent_proc == proc_sym)
1432 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1433 its typespec and formal argument list. */
1436 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1438 gfc_intrinsic_sym* isym = NULL;
1444 /* Already resolved. */
1445 if (sym->from_intmod && sym->ts.type != BT_UNKNOWN)
1448 /* We already know this one is an intrinsic, so we don't call
1449 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1450 gfc_find_subroutine directly to check whether it is a function or
1453 if (sym->intmod_sym_id)
1454 isym = gfc_intrinsic_function_by_id ((gfc_isym_id) sym->intmod_sym_id);
1456 isym = gfc_find_function (sym->name);
1460 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1461 && !sym->attr.implicit_type)
1462 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1463 " ignored", sym->name, &sym->declared_at);
1465 if (!sym->attr.function &&
1466 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1471 else if ((isym = gfc_find_subroutine (sym->name)))
1473 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1475 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1476 " specifier", sym->name, &sym->declared_at);
1480 if (!sym->attr.subroutine &&
1481 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1486 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1491 gfc_copy_formal_args_intr (sym, isym);
1493 /* Check it is actually available in the standard settings. */
1494 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1497 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1498 " available in the current standard settings but %s. Use"
1499 " an appropriate -std=* option or enable -fall-intrinsics"
1500 " in order to use it.",
1501 sym->name, &sym->declared_at, symstd);
1509 /* Resolve a procedure expression, like passing it to a called procedure or as
1510 RHS for a procedure pointer assignment. */
1513 resolve_procedure_expression (gfc_expr* expr)
1517 if (expr->expr_type != EXPR_VARIABLE)
1519 gcc_assert (expr->symtree);
1521 sym = expr->symtree->n.sym;
1523 if (sym->attr.intrinsic)
1524 resolve_intrinsic (sym, &expr->where);
1526 if (sym->attr.flavor != FL_PROCEDURE
1527 || (sym->attr.function && sym->result == sym))
1530 /* A non-RECURSIVE procedure that is used as procedure expression within its
1531 own body is in danger of being called recursively. */
1532 if (is_illegal_recursion (sym, gfc_current_ns))
1533 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1534 " itself recursively. Declare it RECURSIVE or use"
1535 " -frecursive", sym->name, &expr->where);
1541 /* Resolve an actual argument list. Most of the time, this is just
1542 resolving the expressions in the list.
1543 The exception is that we sometimes have to decide whether arguments
1544 that look like procedure arguments are really simple variable
1548 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1549 bool no_formal_args)
1552 gfc_symtree *parent_st;
1554 int save_need_full_assumed_size;
1556 for (; arg; arg = arg->next)
1561 /* Check the label is a valid branching target. */
1564 if (arg->label->defined == ST_LABEL_UNKNOWN)
1566 gfc_error ("Label %d referenced at %L is never defined",
1567 arg->label->value, &arg->label->where);
1574 if (e->expr_type == EXPR_VARIABLE
1575 && e->symtree->n.sym->attr.generic
1577 && count_specific_procs (e) != 1)
1580 if (e->ts.type != BT_PROCEDURE)
1582 save_need_full_assumed_size = need_full_assumed_size;
1583 if (e->expr_type != EXPR_VARIABLE)
1584 need_full_assumed_size = 0;
1585 if (gfc_resolve_expr (e) != SUCCESS)
1587 need_full_assumed_size = save_need_full_assumed_size;
1591 /* See if the expression node should really be a variable reference. */
1593 sym = e->symtree->n.sym;
1595 if (sym->attr.flavor == FL_PROCEDURE
1596 || sym->attr.intrinsic
1597 || sym->attr.external)
1601 /* If a procedure is not already determined to be something else
1602 check if it is intrinsic. */
1603 if (!sym->attr.intrinsic
1604 && !(sym->attr.external || sym->attr.use_assoc
1605 || sym->attr.if_source == IFSRC_IFBODY)
1606 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1607 sym->attr.intrinsic = 1;
1609 if (sym->attr.proc == PROC_ST_FUNCTION)
1611 gfc_error ("Statement function '%s' at %L is not allowed as an "
1612 "actual argument", sym->name, &e->where);
1615 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1616 sym->attr.subroutine);
1617 if (sym->attr.intrinsic && actual_ok == 0)
1619 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1620 "actual argument", sym->name, &e->where);
1623 if (sym->attr.contained && !sym->attr.use_assoc
1624 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1626 if (gfc_notify_std (GFC_STD_F2008,
1627 "Fortran 2008: Internal procedure '%s' is"
1628 " used as actual argument at %L",
1629 sym->name, &e->where) == FAILURE)
1633 if (sym->attr.elemental && !sym->attr.intrinsic)
1635 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1636 "allowed as an actual argument at %L", sym->name,
1640 /* Check if a generic interface has a specific procedure
1641 with the same name before emitting an error. */
1642 if (sym->attr.generic && count_specific_procs (e) != 1)
1645 /* Just in case a specific was found for the expression. */
1646 sym = e->symtree->n.sym;
1648 /* If the symbol is the function that names the current (or
1649 parent) scope, then we really have a variable reference. */
1651 if (gfc_is_function_return_value (sym, sym->ns))
1654 /* If all else fails, see if we have a specific intrinsic. */
1655 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1657 gfc_intrinsic_sym *isym;
1659 isym = gfc_find_function (sym->name);
1660 if (isym == NULL || !isym->specific)
1662 gfc_error ("Unable to find a specific INTRINSIC procedure "
1663 "for the reference '%s' at %L", sym->name,
1668 sym->attr.intrinsic = 1;
1669 sym->attr.function = 1;
1672 if (gfc_resolve_expr (e) == FAILURE)
1677 /* See if the name is a module procedure in a parent unit. */
1679 if (was_declared (sym) || sym->ns->parent == NULL)
1682 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1684 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1688 if (parent_st == NULL)
1691 sym = parent_st->n.sym;
1692 e->symtree = parent_st; /* Point to the right thing. */
1694 if (sym->attr.flavor == FL_PROCEDURE
1695 || sym->attr.intrinsic
1696 || sym->attr.external)
1698 if (gfc_resolve_expr (e) == FAILURE)
1704 e->expr_type = EXPR_VARIABLE;
1706 if (sym->as != NULL)
1708 e->rank = sym->as->rank;
1709 e->ref = gfc_get_ref ();
1710 e->ref->type = REF_ARRAY;
1711 e->ref->u.ar.type = AR_FULL;
1712 e->ref->u.ar.as = sym->as;
1715 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1716 primary.c (match_actual_arg). If above code determines that it
1717 is a variable instead, it needs to be resolved as it was not
1718 done at the beginning of this function. */
1719 save_need_full_assumed_size = need_full_assumed_size;
1720 if (e->expr_type != EXPR_VARIABLE)
1721 need_full_assumed_size = 0;
1722 if (gfc_resolve_expr (e) != SUCCESS)
1724 need_full_assumed_size = save_need_full_assumed_size;
1727 /* Check argument list functions %VAL, %LOC and %REF. There is
1728 nothing to do for %REF. */
1729 if (arg->name && arg->name[0] == '%')
1731 if (strncmp ("%VAL", arg->name, 4) == 0)
1733 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1735 gfc_error ("By-value argument at %L is not of numeric "
1742 gfc_error ("By-value argument at %L cannot be an array or "
1743 "an array section", &e->where);
1747 /* Intrinsics are still PROC_UNKNOWN here. However,
1748 since same file external procedures are not resolvable
1749 in gfortran, it is a good deal easier to leave them to
1751 if (ptype != PROC_UNKNOWN
1752 && ptype != PROC_DUMMY
1753 && ptype != PROC_EXTERNAL
1754 && ptype != PROC_MODULE)
1756 gfc_error ("By-value argument at %L is not allowed "
1757 "in this context", &e->where);
1762 /* Statement functions have already been excluded above. */
1763 else if (strncmp ("%LOC", arg->name, 4) == 0
1764 && e->ts.type == BT_PROCEDURE)
1766 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1768 gfc_error ("Passing internal procedure at %L by location "
1769 "not allowed", &e->where);
1775 /* Fortran 2008, C1237. */
1776 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1777 && gfc_has_ultimate_pointer (e))
1779 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1780 "component", &e->where);
1789 /* Do the checks of the actual argument list that are specific to elemental
1790 procedures. If called with c == NULL, we have a function, otherwise if
1791 expr == NULL, we have a subroutine. */
1794 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1796 gfc_actual_arglist *arg0;
1797 gfc_actual_arglist *arg;
1798 gfc_symbol *esym = NULL;
1799 gfc_intrinsic_sym *isym = NULL;
1801 gfc_intrinsic_arg *iformal = NULL;
1802 gfc_formal_arglist *eformal = NULL;
1803 bool formal_optional = false;
1804 bool set_by_optional = false;
1808 /* Is this an elemental procedure? */
1809 if (expr && expr->value.function.actual != NULL)
1811 if (expr->value.function.esym != NULL
1812 && expr->value.function.esym->attr.elemental)
1814 arg0 = expr->value.function.actual;
1815 esym = expr->value.function.esym;
1817 else if (expr->value.function.isym != NULL
1818 && expr->value.function.isym->elemental)
1820 arg0 = expr->value.function.actual;
1821 isym = expr->value.function.isym;
1826 else if (c && c->ext.actual != NULL)
1828 arg0 = c->ext.actual;
1830 if (c->resolved_sym)
1831 esym = c->resolved_sym;
1833 esym = c->symtree->n.sym;
1836 if (!esym->attr.elemental)
1842 /* The rank of an elemental is the rank of its array argument(s). */
1843 for (arg = arg0; arg; arg = arg->next)
1845 if (arg->expr != NULL && arg->expr->rank > 0)
1847 rank = arg->expr->rank;
1848 if (arg->expr->expr_type == EXPR_VARIABLE
1849 && arg->expr->symtree->n.sym->attr.optional)
1850 set_by_optional = true;
1852 /* Function specific; set the result rank and shape. */
1856 if (!expr->shape && arg->expr->shape)
1858 expr->shape = gfc_get_shape (rank);
1859 for (i = 0; i < rank; i++)
1860 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1867 /* If it is an array, it shall not be supplied as an actual argument
1868 to an elemental procedure unless an array of the same rank is supplied
1869 as an actual argument corresponding to a nonoptional dummy argument of
1870 that elemental procedure(12.4.1.5). */
1871 formal_optional = false;
1873 iformal = isym->formal;
1875 eformal = esym->formal;
1877 for (arg = arg0; arg; arg = arg->next)
1881 if (eformal->sym && eformal->sym->attr.optional)
1882 formal_optional = true;
1883 eformal = eformal->next;
1885 else if (isym && iformal)
1887 if (iformal->optional)
1888 formal_optional = true;
1889 iformal = iformal->next;
1892 formal_optional = true;
1894 if (pedantic && arg->expr != NULL
1895 && arg->expr->expr_type == EXPR_VARIABLE
1896 && arg->expr->symtree->n.sym->attr.optional
1899 && (set_by_optional || arg->expr->rank != rank)
1900 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1902 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1903 "MISSING, it cannot be the actual argument of an "
1904 "ELEMENTAL procedure unless there is a non-optional "
1905 "argument with the same rank (12.4.1.5)",
1906 arg->expr->symtree->n.sym->name, &arg->expr->where);
1911 for (arg = arg0; arg; arg = arg->next)
1913 if (arg->expr == NULL || arg->expr->rank == 0)
1916 /* Being elemental, the last upper bound of an assumed size array
1917 argument must be present. */
1918 if (resolve_assumed_size_actual (arg->expr))
1921 /* Elemental procedure's array actual arguments must conform. */
1924 if (gfc_check_conformance (arg->expr, e,
1925 "elemental procedure") == FAILURE)
1932 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1933 is an array, the intent inout/out variable needs to be also an array. */
1934 if (rank > 0 && esym && expr == NULL)
1935 for (eformal = esym->formal, arg = arg0; arg && eformal;
1936 arg = arg->next, eformal = eformal->next)
1937 if ((eformal->sym->attr.intent == INTENT_OUT
1938 || eformal->sym->attr.intent == INTENT_INOUT)
1939 && arg->expr && arg->expr->rank == 0)
1941 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1942 "ELEMENTAL subroutine '%s' is a scalar, but another "
1943 "actual argument is an array", &arg->expr->where,
1944 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1945 : "INOUT", eformal->sym->name, esym->name);
1952 /* This function does the checking of references to global procedures
1953 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1954 77 and 95 standards. It checks for a gsymbol for the name, making
1955 one if it does not already exist. If it already exists, then the
1956 reference being resolved must correspond to the type of gsymbol.
1957 Otherwise, the new symbol is equipped with the attributes of the
1958 reference. The corresponding code that is called in creating
1959 global entities is parse.c.
1961 In addition, for all but -std=legacy, the gsymbols are used to
1962 check the interfaces of external procedures from the same file.
1963 The namespace of the gsymbol is resolved and then, once this is
1964 done the interface is checked. */
1968 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
1970 if (!gsym_ns->proc_name->attr.recursive)
1973 if (sym->ns == gsym_ns)
1976 if (sym->ns->parent && sym->ns->parent == gsym_ns)
1983 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
1985 if (gsym_ns->entries)
1987 gfc_entry_list *entry = gsym_ns->entries;
1989 for (; entry; entry = entry->next)
1991 if (strcmp (sym->name, entry->sym->name) == 0)
1993 if (strcmp (gsym_ns->proc_name->name,
1994 sym->ns->proc_name->name) == 0)
1998 && strcmp (gsym_ns->proc_name->name,
1999 sym->ns->parent->proc_name->name) == 0)
2008 resolve_global_procedure (gfc_symbol *sym, locus *where,
2009 gfc_actual_arglist **actual, int sub)
2013 enum gfc_symbol_type type;
2015 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
2017 gsym = gfc_get_gsymbol (sym->name);
2019 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
2020 gfc_global_used (gsym, where);
2022 if (gfc_option.flag_whole_file
2023 && (sym->attr.if_source == IFSRC_UNKNOWN
2024 || sym->attr.if_source == IFSRC_IFBODY)
2025 && gsym->type != GSYM_UNKNOWN
2027 && gsym->ns->resolved != -1
2028 && gsym->ns->proc_name
2029 && not_in_recursive (sym, gsym->ns)
2030 && not_entry_self_reference (sym, gsym->ns))
2032 gfc_symbol *def_sym;
2034 /* Resolve the gsymbol namespace if needed. */
2035 if (!gsym->ns->resolved)
2037 gfc_dt_list *old_dt_list;
2038 struct gfc_omp_saved_state old_omp_state;
2040 /* Stash away derived types so that the backend_decls do not
2042 old_dt_list = gfc_derived_types;
2043 gfc_derived_types = NULL;
2044 /* And stash away openmp state. */
2045 gfc_omp_save_and_clear_state (&old_omp_state);
2047 gfc_resolve (gsym->ns);
2049 /* Store the new derived types with the global namespace. */
2050 if (gfc_derived_types)
2051 gsym->ns->derived_types = gfc_derived_types;
2053 /* Restore the derived types of this namespace. */
2054 gfc_derived_types = old_dt_list;
2055 /* And openmp state. */
2056 gfc_omp_restore_state (&old_omp_state);
2059 /* Make sure that translation for the gsymbol occurs before
2060 the procedure currently being resolved. */
2061 ns = gfc_global_ns_list;
2062 for (; ns && ns != gsym->ns; ns = ns->sibling)
2064 if (ns->sibling == gsym->ns)
2066 ns->sibling = gsym->ns->sibling;
2067 gsym->ns->sibling = gfc_global_ns_list;
2068 gfc_global_ns_list = gsym->ns;
2073 def_sym = gsym->ns->proc_name;
2074 if (def_sym->attr.entry_master)
2076 gfc_entry_list *entry;
2077 for (entry = gsym->ns->entries; entry; entry = entry->next)
2078 if (strcmp (entry->sym->name, sym->name) == 0)
2080 def_sym = entry->sym;
2085 /* Differences in constant character lengths. */
2086 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
2088 long int l1 = 0, l2 = 0;
2089 gfc_charlen *cl1 = sym->ts.u.cl;
2090 gfc_charlen *cl2 = def_sym->ts.u.cl;
2093 && cl1->length != NULL
2094 && cl1->length->expr_type == EXPR_CONSTANT)
2095 l1 = mpz_get_si (cl1->length->value.integer);
2098 && cl2->length != NULL
2099 && cl2->length->expr_type == EXPR_CONSTANT)
2100 l2 = mpz_get_si (cl2->length->value.integer);
2102 if (l1 && l2 && l1 != l2)
2103 gfc_error ("Character length mismatch in return type of "
2104 "function '%s' at %L (%ld/%ld)", sym->name,
2105 &sym->declared_at, l1, l2);
2108 /* Type mismatch of function return type and expected type. */
2109 if (sym->attr.function
2110 && !gfc_compare_types (&sym->ts, &def_sym->ts))
2111 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
2112 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
2113 gfc_typename (&def_sym->ts));
2115 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
2117 gfc_formal_arglist *arg = def_sym->formal;
2118 for ( ; arg; arg = arg->next)
2121 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
2122 else if (arg->sym->attr.allocatable
2123 || arg->sym->attr.asynchronous
2124 || arg->sym->attr.optional
2125 || arg->sym->attr.pointer
2126 || arg->sym->attr.target
2127 || arg->sym->attr.value
2128 || arg->sym->attr.volatile_)
2130 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
2131 "has an attribute that requires an explicit "
2132 "interface for this procedure", arg->sym->name,
2133 sym->name, &sym->declared_at);
2136 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
2137 else if (arg->sym && arg->sym->as
2138 && arg->sym->as->type == AS_ASSUMED_SHAPE)
2140 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
2141 "argument '%s' must have an explicit interface",
2142 sym->name, &sym->declared_at, arg->sym->name);
2145 /* F2008, 12.4.2.2 (2c) */
2146 else if (arg->sym->attr.codimension)
2148 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
2149 "'%s' must have an explicit interface",
2150 sym->name, &sym->declared_at, arg->sym->name);
2153 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
2154 else if (false) /* TODO: is a parametrized derived type */
2156 gfc_error ("Procedure '%s' at %L with parametrized derived "
2157 "type argument '%s' must have an explicit "
2158 "interface", sym->name, &sym->declared_at,
2162 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
2163 else if (arg->sym->ts.type == BT_CLASS)
2165 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
2166 "argument '%s' must have an explicit interface",
2167 sym->name, &sym->declared_at, arg->sym->name);
2172 if (def_sym->attr.function)
2174 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
2175 if (def_sym->as && def_sym->as->rank
2176 && (!sym->as || sym->as->rank != def_sym->as->rank))
2177 gfc_error ("The reference to function '%s' at %L either needs an "
2178 "explicit INTERFACE or the rank is incorrect", sym->name,
2181 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
2182 if ((def_sym->result->attr.pointer
2183 || def_sym->result->attr.allocatable)
2184 && (sym->attr.if_source != IFSRC_IFBODY
2185 || def_sym->result->attr.pointer
2186 != sym->result->attr.pointer
2187 || def_sym->result->attr.allocatable
2188 != sym->result->attr.allocatable))
2189 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
2190 "result must have an explicit interface", sym->name,
2193 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
2194 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
2195 && def_sym->ts.type == BT_CHARACTER && def_sym->ts.u.cl->length != NULL)
2197 gfc_charlen *cl = sym->ts.u.cl;
2199 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
2200 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
2202 gfc_error ("Nonconstant character-length function '%s' at %L "
2203 "must have an explicit interface", sym->name,
2209 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2210 if (def_sym->attr.elemental && !sym->attr.elemental)
2212 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2213 "interface", sym->name, &sym->declared_at);
2216 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2217 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2219 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2220 "an explicit interface", sym->name, &sym->declared_at);
2223 if (gfc_option.flag_whole_file == 1
2224 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2225 && !(gfc_option.warn_std & GFC_STD_GNU)))
2226 gfc_errors_to_warnings (1);
2228 if (sym->attr.if_source != IFSRC_IFBODY)
2229 gfc_procedure_use (def_sym, actual, where);
2231 gfc_errors_to_warnings (0);
2234 if (gsym->type == GSYM_UNKNOWN)
2237 gsym->where = *where;
2244 /************* Function resolution *************/
2246 /* Resolve a function call known to be generic.
2247 Section 14.1.2.4.1. */
2250 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2254 if (sym->attr.generic)
2256 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2259 expr->value.function.name = s->name;
2260 expr->value.function.esym = s;
2262 if (s->ts.type != BT_UNKNOWN)
2264 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2265 expr->ts = s->result->ts;
2268 expr->rank = s->as->rank;
2269 else if (s->result != NULL && s->result->as != NULL)
2270 expr->rank = s->result->as->rank;
2272 gfc_set_sym_referenced (expr->value.function.esym);
2277 /* TODO: Need to search for elemental references in generic
2281 if (sym->attr.intrinsic)
2282 return gfc_intrinsic_func_interface (expr, 0);
2289 resolve_generic_f (gfc_expr *expr)
2294 sym = expr->symtree->n.sym;
2298 m = resolve_generic_f0 (expr, sym);
2301 else if (m == MATCH_ERROR)
2305 if (sym->ns->parent == NULL)
2307 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2311 if (!generic_sym (sym))
2315 /* Last ditch attempt. See if the reference is to an intrinsic
2316 that possesses a matching interface. 14.1.2.4 */
2317 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2319 gfc_error ("There is no specific function for the generic '%s' at %L",
2320 expr->symtree->n.sym->name, &expr->where);
2324 m = gfc_intrinsic_func_interface (expr, 0);
2328 gfc_error ("Generic function '%s' at %L is not consistent with a "
2329 "specific intrinsic interface", expr->symtree->n.sym->name,
2336 /* Resolve a function call known to be specific. */
2339 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2343 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2345 if (sym->attr.dummy)
2347 sym->attr.proc = PROC_DUMMY;
2351 sym->attr.proc = PROC_EXTERNAL;
2355 if (sym->attr.proc == PROC_MODULE
2356 || sym->attr.proc == PROC_ST_FUNCTION
2357 || sym->attr.proc == PROC_INTERNAL)
2360 if (sym->attr.intrinsic)
2362 m = gfc_intrinsic_func_interface (expr, 1);
2366 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2367 "with an intrinsic", sym->name, &expr->where);
2375 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2378 expr->ts = sym->result->ts;
2381 expr->value.function.name = sym->name;
2382 expr->value.function.esym = sym;
2383 if (sym->as != NULL)
2384 expr->rank = sym->as->rank;
2391 resolve_specific_f (gfc_expr *expr)
2396 sym = expr->symtree->n.sym;
2400 m = resolve_specific_f0 (sym, expr);
2403 if (m == MATCH_ERROR)
2406 if (sym->ns->parent == NULL)
2409 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2415 gfc_error ("Unable to resolve the specific function '%s' at %L",
2416 expr->symtree->n.sym->name, &expr->where);
2422 /* Resolve a procedure call not known to be generic nor specific. */
2425 resolve_unknown_f (gfc_expr *expr)
2430 sym = expr->symtree->n.sym;
2432 if (sym->attr.dummy)
2434 sym->attr.proc = PROC_DUMMY;
2435 expr->value.function.name = sym->name;
2439 /* See if we have an intrinsic function reference. */
2441 if (gfc_is_intrinsic (sym, 0, expr->where))
2443 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2448 /* The reference is to an external name. */
2450 sym->attr.proc = PROC_EXTERNAL;
2451 expr->value.function.name = sym->name;
2452 expr->value.function.esym = expr->symtree->n.sym;
2454 if (sym->as != NULL)
2455 expr->rank = sym->as->rank;
2457 /* Type of the expression is either the type of the symbol or the
2458 default type of the symbol. */
2461 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2463 if (sym->ts.type != BT_UNKNOWN)
2467 ts = gfc_get_default_type (sym->name, sym->ns);
2469 if (ts->type == BT_UNKNOWN)
2471 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2472 sym->name, &expr->where);
2483 /* Return true, if the symbol is an external procedure. */
2485 is_external_proc (gfc_symbol *sym)
2487 if (!sym->attr.dummy && !sym->attr.contained
2488 && !(sym->attr.intrinsic
2489 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2490 && sym->attr.proc != PROC_ST_FUNCTION
2491 && !sym->attr.proc_pointer
2492 && !sym->attr.use_assoc
2500 /* Figure out if a function reference is pure or not. Also set the name
2501 of the function for a potential error message. Return nonzero if the
2502 function is PURE, zero if not. */
2504 pure_stmt_function (gfc_expr *, gfc_symbol *);
2507 pure_function (gfc_expr *e, const char **name)
2513 if (e->symtree != NULL
2514 && e->symtree->n.sym != NULL
2515 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2516 return pure_stmt_function (e, e->symtree->n.sym);
2518 if (e->value.function.esym)
2520 pure = gfc_pure (e->value.function.esym);
2521 *name = e->value.function.esym->name;
2523 else if (e->value.function.isym)
2525 pure = e->value.function.isym->pure
2526 || e->value.function.isym->elemental;
2527 *name = e->value.function.isym->name;
2531 /* Implicit functions are not pure. */
2533 *name = e->value.function.name;
2541 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2542 int *f ATTRIBUTE_UNUSED)
2546 /* Don't bother recursing into other statement functions
2547 since they will be checked individually for purity. */
2548 if (e->expr_type != EXPR_FUNCTION
2550 || e->symtree->n.sym == sym
2551 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2554 return pure_function (e, &name) ? false : true;
2559 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2561 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2566 is_scalar_expr_ptr (gfc_expr *expr)
2568 gfc_try retval = SUCCESS;
2573 /* See if we have a gfc_ref, which means we have a substring, array
2574 reference, or a component. */
2575 if (expr->ref != NULL)
2578 while (ref->next != NULL)
2584 if (ref->u.ss.start == NULL || ref->u.ss.end == NULL
2585 || gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) != 0)
2590 if (ref->u.ar.type == AR_ELEMENT)
2592 else if (ref->u.ar.type == AR_FULL)
2594 /* The user can give a full array if the array is of size 1. */
2595 if (ref->u.ar.as != NULL
2596 && ref->u.ar.as->rank == 1
2597 && ref->u.ar.as->type == AS_EXPLICIT
2598 && ref->u.ar.as->lower[0] != NULL
2599 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2600 && ref->u.ar.as->upper[0] != NULL
2601 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2603 /* If we have a character string, we need to check if
2604 its length is one. */
2605 if (expr->ts.type == BT_CHARACTER)
2607 if (expr->ts.u.cl == NULL
2608 || expr->ts.u.cl->length == NULL
2609 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2615 /* We have constant lower and upper bounds. If the
2616 difference between is 1, it can be considered a
2618 FIXME: Use gfc_dep_compare_expr instead. */
2619 start = (int) mpz_get_si
2620 (ref->u.ar.as->lower[0]->value.integer);
2621 end = (int) mpz_get_si
2622 (ref->u.ar.as->upper[0]->value.integer);
2623 if (end - start + 1 != 1)
2638 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2640 /* Character string. Make sure it's of length 1. */
2641 if (expr->ts.u.cl == NULL
2642 || expr->ts.u.cl->length == NULL
2643 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2646 else if (expr->rank != 0)
2653 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2654 and, in the case of c_associated, set the binding label based on
2658 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2659 gfc_symbol **new_sym)
2661 char name[GFC_MAX_SYMBOL_LEN + 1];
2662 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2663 int optional_arg = 0;
2664 gfc_try retval = SUCCESS;
2665 gfc_symbol *args_sym;
2666 gfc_typespec *arg_ts;
2667 symbol_attribute arg_attr;
2669 if (args->expr->expr_type == EXPR_CONSTANT
2670 || args->expr->expr_type == EXPR_OP
2671 || args->expr->expr_type == EXPR_NULL)
2673 gfc_error ("Argument to '%s' at %L is not a variable",
2674 sym->name, &(args->expr->where));
2678 args_sym = args->expr->symtree->n.sym;
2680 /* The typespec for the actual arg should be that stored in the expr
2681 and not necessarily that of the expr symbol (args_sym), because
2682 the actual expression could be a part-ref of the expr symbol. */
2683 arg_ts = &(args->expr->ts);
2684 arg_attr = gfc_expr_attr (args->expr);
2686 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2688 /* If the user gave two args then they are providing something for
2689 the optional arg (the second cptr). Therefore, set the name and
2690 binding label to the c_associated for two cptrs. Otherwise,
2691 set c_associated to expect one cptr. */
2695 sprintf (name, "%s_2", sym->name);
2696 sprintf (binding_label, "%s_2", sym->binding_label);
2702 sprintf (name, "%s_1", sym->name);
2703 sprintf (binding_label, "%s_1", sym->binding_label);
2707 /* Get a new symbol for the version of c_associated that
2709 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2711 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2712 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2714 sprintf (name, "%s", sym->name);
2715 sprintf (binding_label, "%s", sym->binding_label);
2717 /* Error check the call. */
2718 if (args->next != NULL)
2720 gfc_error_now ("More actual than formal arguments in '%s' "
2721 "call at %L", name, &(args->expr->where));
2724 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2729 /* Make sure we have either the target or pointer attribute. */
2730 if (!arg_attr.target && !arg_attr.pointer)
2732 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2733 "a TARGET or an associated pointer",
2735 sym->name, &(args->expr->where));
2739 if (gfc_is_coindexed (args->expr))
2741 gfc_error_now ("Coindexed argument not permitted"
2742 " in '%s' call at %L", name,
2743 &(args->expr->where));
2747 /* Follow references to make sure there are no array
2749 seen_section = false;
2751 for (ref=args->expr->ref; ref; ref = ref->next)
2753 if (ref->type == REF_ARRAY)
2755 if (ref->u.ar.type == AR_SECTION)
2756 seen_section = true;
2758 if (ref->u.ar.type != AR_ELEMENT)
2761 for (r = ref->next; r; r=r->next)
2762 if (r->type == REF_COMPONENT)
2764 gfc_error_now ("Array section not permitted"
2765 " in '%s' call at %L", name,
2766 &(args->expr->where));
2774 if (seen_section && retval == SUCCESS)
2775 gfc_warning ("Array section in '%s' call at %L", name,
2776 &(args->expr->where));
2778 /* See if we have interoperable type and type param. */
2779 if (verify_c_interop (arg_ts) == SUCCESS
2780 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2782 if (args_sym->attr.target == 1)
2784 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2785 has the target attribute and is interoperable. */
2786 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2787 allocatable variable that has the TARGET attribute and
2788 is not an array of zero size. */
2789 if (args_sym->attr.allocatable == 1)
2791 if (args_sym->attr.dimension != 0
2792 && (args_sym->as && args_sym->as->rank == 0))
2794 gfc_error_now ("Allocatable variable '%s' used as a "
2795 "parameter to '%s' at %L must not be "
2796 "an array of zero size",
2797 args_sym->name, sym->name,
2798 &(args->expr->where));
2804 /* A non-allocatable target variable with C
2805 interoperable type and type parameters must be
2807 if (args_sym && args_sym->attr.dimension)
2809 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2811 gfc_error ("Assumed-shape array '%s' at %L "
2812 "cannot be an argument to the "
2813 "procedure '%s' because "
2814 "it is not C interoperable",
2816 &(args->expr->where), sym->name);
2819 else if (args_sym->as->type == AS_DEFERRED)
2821 gfc_error ("Deferred-shape array '%s' at %L "
2822 "cannot be an argument to the "
2823 "procedure '%s' because "
2824 "it is not C interoperable",
2826 &(args->expr->where), sym->name);
2831 /* Make sure it's not a character string. Arrays of
2832 any type should be ok if the variable is of a C
2833 interoperable type. */
2834 if (arg_ts->type == BT_CHARACTER)
2835 if (arg_ts->u.cl != NULL
2836 && (arg_ts->u.cl->length == NULL
2837 || arg_ts->u.cl->length->expr_type
2840 (arg_ts->u.cl->length->value.integer, 1)
2842 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2844 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2845 "at %L must have a length of 1",
2846 args_sym->name, sym->name,
2847 &(args->expr->where));
2852 else if (arg_attr.pointer
2853 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2855 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2857 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2858 "associated scalar POINTER", args_sym->name,
2859 sym->name, &(args->expr->where));
2865 /* The parameter is not required to be C interoperable. If it
2866 is not C interoperable, it must be a nonpolymorphic scalar
2867 with no length type parameters. It still must have either
2868 the pointer or target attribute, and it can be
2869 allocatable (but must be allocated when c_loc is called). */
2870 if (args->expr->rank != 0
2871 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2873 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2874 "scalar", args_sym->name, sym->name,
2875 &(args->expr->where));
2878 else if (arg_ts->type == BT_CHARACTER
2879 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2881 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2882 "%L must have a length of 1",
2883 args_sym->name, sym->name,
2884 &(args->expr->where));
2887 else if (arg_ts->type == BT_CLASS)
2889 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2890 "polymorphic", args_sym->name, sym->name,
2891 &(args->expr->where));
2896 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2898 if (args_sym->attr.flavor != FL_PROCEDURE)
2900 /* TODO: Update this error message to allow for procedure
2901 pointers once they are implemented. */
2902 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2904 args_sym->name, sym->name,
2905 &(args->expr->where));
2908 else if (args_sym->attr.is_bind_c != 1)
2910 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2912 args_sym->name, sym->name,
2913 &(args->expr->where));
2918 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2923 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2924 "iso_c_binding function: '%s'!\n", sym->name);
2931 /* Resolve a function call, which means resolving the arguments, then figuring
2932 out which entity the name refers to. */
2935 resolve_function (gfc_expr *expr)
2937 gfc_actual_arglist *arg;
2942 procedure_type p = PROC_INTRINSIC;
2943 bool no_formal_args;
2947 sym = expr->symtree->n.sym;
2949 /* If this is a procedure pointer component, it has already been resolved. */
2950 if (gfc_is_proc_ptr_comp (expr, NULL))
2953 if (sym && sym->attr.intrinsic
2954 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2957 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2959 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2963 /* If this ia a deferred TBP with an abstract interface (which may
2964 of course be referenced), expr->value.function.esym will be set. */
2965 if (sym && sym->attr.abstract && !expr->value.function.esym)
2967 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
2968 sym->name, &expr->where);
2972 /* Switch off assumed size checking and do this again for certain kinds
2973 of procedure, once the procedure itself is resolved. */
2974 need_full_assumed_size++;
2976 if (expr->symtree && expr->symtree->n.sym)
2977 p = expr->symtree->n.sym->attr.proc;
2979 if (expr->value.function.isym && expr->value.function.isym->inquiry)
2980 inquiry_argument = true;
2981 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
2983 if (resolve_actual_arglist (expr->value.function.actual,
2984 p, no_formal_args) == FAILURE)
2986 inquiry_argument = false;
2990 inquiry_argument = false;
2992 /* Need to setup the call to the correct c_associated, depending on
2993 the number of cptrs to user gives to compare. */
2994 if (sym && sym->attr.is_iso_c == 1)
2996 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
3000 /* Get the symtree for the new symbol (resolved func).
3001 the old one will be freed later, when it's no longer used. */
3002 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
3005 /* Resume assumed_size checking. */
3006 need_full_assumed_size--;
3008 /* If the procedure is external, check for usage. */
3009 if (sym && is_external_proc (sym))
3010 resolve_global_procedure (sym, &expr->where,
3011 &expr->value.function.actual, 0);
3013 if (sym && sym->ts.type == BT_CHARACTER
3015 && sym->ts.u.cl->length == NULL
3017 && !sym->ts.deferred
3018 && expr->value.function.esym == NULL
3019 && !sym->attr.contained)
3021 /* Internal procedures are taken care of in resolve_contained_fntype. */
3022 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
3023 "be used at %L since it is not a dummy argument",
3024 sym->name, &expr->where);
3028 /* See if function is already resolved. */
3030 if (expr->value.function.name != NULL)
3032 if (expr->ts.type == BT_UNKNOWN)
3038 /* Apply the rules of section 14.1.2. */
3040 switch (procedure_kind (sym))
3043 t = resolve_generic_f (expr);
3046 case PTYPE_SPECIFIC:
3047 t = resolve_specific_f (expr);
3051 t = resolve_unknown_f (expr);
3055 gfc_internal_error ("resolve_function(): bad function type");
3059 /* If the expression is still a function (it might have simplified),
3060 then we check to see if we are calling an elemental function. */
3062 if (expr->expr_type != EXPR_FUNCTION)
3065 temp = need_full_assumed_size;
3066 need_full_assumed_size = 0;
3068 if (resolve_elemental_actual (expr, NULL) == FAILURE)
3071 if (omp_workshare_flag
3072 && expr->value.function.esym
3073 && ! gfc_elemental (expr->value.function.esym))
3075 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
3076 "in WORKSHARE construct", expr->value.function.esym->name,
3081 #define GENERIC_ID expr->value.function.isym->id
3082 else if (expr->value.function.actual != NULL
3083 && expr->value.function.isym != NULL
3084 && GENERIC_ID != GFC_ISYM_LBOUND
3085 && GENERIC_ID != GFC_ISYM_LEN
3086 && GENERIC_ID != GFC_ISYM_LOC
3087 && GENERIC_ID != GFC_ISYM_PRESENT)
3089 /* Array intrinsics must also have the last upper bound of an
3090 assumed size array argument. UBOUND and SIZE have to be
3091 excluded from the check if the second argument is anything
3094 for (arg = expr->value.function.actual; arg; arg = arg->next)
3096 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
3097 && arg->next != NULL && arg->next->expr)
3099 if (arg->next->expr->expr_type != EXPR_CONSTANT)
3102 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
3105 if ((int)mpz_get_si (arg->next->expr->value.integer)
3110 if (arg->expr != NULL
3111 && arg->expr->rank > 0
3112 && resolve_assumed_size_actual (arg->expr))
3118 need_full_assumed_size = temp;
3121 if (!pure_function (expr, &name) && name)
3125 gfc_error ("reference to non-PURE function '%s' at %L inside a "
3126 "FORALL %s", name, &expr->where,
3127 forall_flag == 2 ? "mask" : "block");
3130 else if (gfc_pure (NULL))
3132 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
3133 "procedure within a PURE procedure", name, &expr->where);
3138 if (!pure_function (expr, &name) && name && gfc_implicit_pure (NULL))
3139 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3141 /* Functions without the RECURSIVE attribution are not allowed to
3142 * call themselves. */
3143 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
3146 esym = expr->value.function.esym;
3148 if (is_illegal_recursion (esym, gfc_current_ns))
3150 if (esym->attr.entry && esym->ns->entries)
3151 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3152 " function '%s' is not RECURSIVE",
3153 esym->name, &expr->where, esym->ns->entries->sym->name);
3155 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
3156 " is not RECURSIVE", esym->name, &expr->where);
3162 /* Character lengths of use associated functions may contains references to
3163 symbols not referenced from the current program unit otherwise. Make sure
3164 those symbols are marked as referenced. */
3166 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
3167 && expr->value.function.esym->attr.use_assoc)
3169 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
3172 /* Make sure that the expression has a typespec that works. */
3173 if (expr->ts.type == BT_UNKNOWN)
3175 if (expr->symtree->n.sym->result
3176 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
3177 && !expr->symtree->n.sym->result->attr.proc_pointer)
3178 expr->ts = expr->symtree->n.sym->result->ts;
3185 /************* Subroutine resolution *************/
3188 pure_subroutine (gfc_code *c, gfc_symbol *sym)
3194 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
3195 sym->name, &c->loc);
3196 else if (gfc_pure (NULL))
3197 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
3203 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
3207 if (sym->attr.generic)
3209 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
3212 c->resolved_sym = s;
3213 pure_subroutine (c, s);
3217 /* TODO: Need to search for elemental references in generic interface. */
3220 if (sym->attr.intrinsic)
3221 return gfc_intrinsic_sub_interface (c, 0);
3228 resolve_generic_s (gfc_code *c)
3233 sym = c->symtree->n.sym;
3237 m = resolve_generic_s0 (c, sym);
3240 else if (m == MATCH_ERROR)
3244 if (sym->ns->parent == NULL)
3246 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3250 if (!generic_sym (sym))
3254 /* Last ditch attempt. See if the reference is to an intrinsic
3255 that possesses a matching interface. 14.1.2.4 */
3256 sym = c->symtree->n.sym;
3258 if (!gfc_is_intrinsic (sym, 1, c->loc))
3260 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3261 sym->name, &c->loc);
3265 m = gfc_intrinsic_sub_interface (c, 0);
3269 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3270 "intrinsic subroutine interface", sym->name, &c->loc);
3276 /* Set the name and binding label of the subroutine symbol in the call
3277 expression represented by 'c' to include the type and kind of the
3278 second parameter. This function is for resolving the appropriate
3279 version of c_f_pointer() and c_f_procpointer(). For example, a
3280 call to c_f_pointer() for a default integer pointer could have a
3281 name of c_f_pointer_i4. If no second arg exists, which is an error
3282 for these two functions, it defaults to the generic symbol's name
3283 and binding label. */
3286 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3287 char *name, char *binding_label)
3289 gfc_expr *arg = NULL;
3293 /* The second arg of c_f_pointer and c_f_procpointer determines
3294 the type and kind for the procedure name. */
3295 arg = c->ext.actual->next->expr;
3299 /* Set up the name to have the given symbol's name,
3300 plus the type and kind. */
3301 /* a derived type is marked with the type letter 'u' */
3302 if (arg->ts.type == BT_DERIVED)
3305 kind = 0; /* set the kind as 0 for now */
3309 type = gfc_type_letter (arg->ts.type);
3310 kind = arg->ts.kind;
3313 if (arg->ts.type == BT_CHARACTER)
3314 /* Kind info for character strings not needed. */
3317 sprintf (name, "%s_%c%d", sym->name, type, kind);
3318 /* Set up the binding label as the given symbol's label plus
3319 the type and kind. */
3320 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3324 /* If the second arg is missing, set the name and label as
3325 was, cause it should at least be found, and the missing
3326 arg error will be caught by compare_parameters(). */
3327 sprintf (name, "%s", sym->name);
3328 sprintf (binding_label, "%s", sym->binding_label);
3335 /* Resolve a generic version of the iso_c_binding procedure given
3336 (sym) to the specific one based on the type and kind of the
3337 argument(s). Currently, this function resolves c_f_pointer() and
3338 c_f_procpointer based on the type and kind of the second argument
3339 (FPTR). Other iso_c_binding procedures aren't specially handled.
3340 Upon successfully exiting, c->resolved_sym will hold the resolved
3341 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3345 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3347 gfc_symbol *new_sym;
3348 /* this is fine, since we know the names won't use the max */
3349 char name[GFC_MAX_SYMBOL_LEN + 1];
3350 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3351 /* default to success; will override if find error */
3352 match m = MATCH_YES;
3354 /* Make sure the actual arguments are in the necessary order (based on the
3355 formal args) before resolving. */
3356 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3358 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3359 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3361 set_name_and_label (c, sym, name, binding_label);
3363 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3365 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3367 /* Make sure we got a third arg if the second arg has non-zero
3368 rank. We must also check that the type and rank are
3369 correct since we short-circuit this check in
3370 gfc_procedure_use() (called above to sort actual args). */
3371 if (c->ext.actual->next->expr->rank != 0)
3373 if(c->ext.actual->next->next == NULL
3374 || c->ext.actual->next->next->expr == NULL)
3377 gfc_error ("Missing SHAPE parameter for call to %s "
3378 "at %L", sym->name, &(c->loc));
3380 else if (c->ext.actual->next->next->expr->ts.type
3382 || c->ext.actual->next->next->expr->rank != 1)
3385 gfc_error ("SHAPE parameter for call to %s at %L must "
3386 "be a rank 1 INTEGER array", sym->name,
3393 if (m != MATCH_ERROR)
3395 /* the 1 means to add the optional arg to formal list */
3396 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3398 /* for error reporting, say it's declared where the original was */
3399 new_sym->declared_at = sym->declared_at;
3404 /* no differences for c_loc or c_funloc */
3408 /* set the resolved symbol */
3409 if (m != MATCH_ERROR)
3410 c->resolved_sym = new_sym;
3412 c->resolved_sym = sym;
3418 /* Resolve a subroutine call known to be specific. */
3421 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3425 if(sym->attr.is_iso_c)
3427 m = gfc_iso_c_sub_interface (c,sym);
3431 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3433 if (sym->attr.dummy)
3435 sym->attr.proc = PROC_DUMMY;
3439 sym->attr.proc = PROC_EXTERNAL;
3443 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3446 if (sym->attr.intrinsic)
3448 m = gfc_intrinsic_sub_interface (c, 1);
3452 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3453 "with an intrinsic", sym->name, &c->loc);
3461 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3463 c->resolved_sym = sym;
3464 pure_subroutine (c, sym);
3471 resolve_specific_s (gfc_code *c)
3476 sym = c->symtree->n.sym;
3480 m = resolve_specific_s0 (c, sym);
3483 if (m == MATCH_ERROR)
3486 if (sym->ns->parent == NULL)
3489 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3495 sym = c->symtree->n.sym;
3496 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3497 sym->name, &c->loc);
3503 /* Resolve a subroutine call not known to be generic nor specific. */
3506 resolve_unknown_s (gfc_code *c)
3510 sym = c->symtree->n.sym;
3512 if (sym->attr.dummy)
3514 sym->attr.proc = PROC_DUMMY;
3518 /* See if we have an intrinsic function reference. */
3520 if (gfc_is_intrinsic (sym, 1, c->loc))
3522 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3527 /* The reference is to an external name. */
3530 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3532 c->resolved_sym = sym;
3534 pure_subroutine (c, sym);
3540 /* Resolve a subroutine call. Although it was tempting to use the same code
3541 for functions, subroutines and functions are stored differently and this
3542 makes things awkward. */
3545 resolve_call (gfc_code *c)
3548 procedure_type ptype = PROC_INTRINSIC;
3549 gfc_symbol *csym, *sym;
3550 bool no_formal_args;
3552 csym = c->symtree ? c->symtree->n.sym : NULL;
3554 if (csym && csym->ts.type != BT_UNKNOWN)
3556 gfc_error ("'%s' at %L has a type, which is not consistent with "
3557 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3561 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3564 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3565 sym = st ? st->n.sym : NULL;
3566 if (sym && csym != sym
3567 && sym->ns == gfc_current_ns
3568 && sym->attr.flavor == FL_PROCEDURE
3569 && sym->attr.contained)
3572 if (csym->attr.generic)
3573 c->symtree->n.sym = sym;
3576 csym = c->symtree->n.sym;
3580 /* If this ia a deferred TBP with an abstract interface
3581 (which may of course be referenced), c->expr1 will be set. */
3582 if (csym && csym->attr.abstract && !c->expr1)
3584 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3585 csym->name, &c->loc);
3589 /* Subroutines without the RECURSIVE attribution are not allowed to
3590 * call themselves. */
3591 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3593 if (csym->attr.entry && csym->ns->entries)
3594 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3595 " subroutine '%s' is not RECURSIVE",
3596 csym->name, &c->loc, csym->ns->entries->sym->name);
3598 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3599 " is not RECURSIVE", csym->name, &c->loc);
3604 /* Switch off assumed size checking and do this again for certain kinds
3605 of procedure, once the procedure itself is resolved. */
3606 need_full_assumed_size++;
3609 ptype = csym->attr.proc;
3611 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3612 if (resolve_actual_arglist (c->ext.actual, ptype,
3613 no_formal_args) == FAILURE)
3616 /* Resume assumed_size checking. */
3617 need_full_assumed_size--;
3619 /* If external, check for usage. */
3620 if (csym && is_external_proc (csym))
3621 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3624 if (c->resolved_sym == NULL)
3626 c->resolved_isym = NULL;
3627 switch (procedure_kind (csym))
3630 t = resolve_generic_s (c);
3633 case PTYPE_SPECIFIC:
3634 t = resolve_specific_s (c);
3638 t = resolve_unknown_s (c);
3642 gfc_internal_error ("resolve_subroutine(): bad function type");
3646 /* Some checks of elemental subroutine actual arguments. */
3647 if (resolve_elemental_actual (NULL, c) == FAILURE)
3654 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3655 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3656 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3657 if their shapes do not match. If either op1->shape or op2->shape is
3658 NULL, return SUCCESS. */
3661 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3668 if (op1->shape != NULL && op2->shape != NULL)
3670 for (i = 0; i < op1->rank; i++)
3672 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3674 gfc_error ("Shapes for operands at %L and %L are not conformable",
3675 &op1->where, &op2->where);
3686 /* Resolve an operator expression node. This can involve replacing the
3687 operation with a user defined function call. */
3690 resolve_operator (gfc_expr *e)
3692 gfc_expr *op1, *op2;
3694 bool dual_locus_error;
3697 /* Resolve all subnodes-- give them types. */
3699 switch (e->value.op.op)
3702 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3705 /* Fall through... */
3708 case INTRINSIC_UPLUS:
3709 case INTRINSIC_UMINUS:
3710 case INTRINSIC_PARENTHESES:
3711 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3716 /* Typecheck the new node. */
3718 op1 = e->value.op.op1;
3719 op2 = e->value.op.op2;
3720 dual_locus_error = false;
3722 if ((op1 && op1->expr_type == EXPR_NULL)
3723 || (op2 && op2->expr_type == EXPR_NULL))
3725 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3729 switch (e->value.op.op)
3731 case INTRINSIC_UPLUS:
3732 case INTRINSIC_UMINUS:
3733 if (op1->ts.type == BT_INTEGER
3734 || op1->ts.type == BT_REAL
3735 || op1->ts.type == BT_COMPLEX)
3741 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3742 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3745 case INTRINSIC_PLUS:
3746 case INTRINSIC_MINUS:
3747 case INTRINSIC_TIMES:
3748 case INTRINSIC_DIVIDE:
3749 case INTRINSIC_POWER:
3750 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3752 gfc_type_convert_binary (e, 1);
3757 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3758 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3759 gfc_typename (&op2->ts));
3762 case INTRINSIC_CONCAT:
3763 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3764 && op1->ts.kind == op2->ts.kind)
3766 e->ts.type = BT_CHARACTER;
3767 e->ts.kind = op1->ts.kind;
3772 _("Operands of string concatenation operator at %%L are %s/%s"),
3773 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3779 case INTRINSIC_NEQV:
3780 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3782 e->ts.type = BT_LOGICAL;
3783 e->ts.kind = gfc_kind_max (op1, op2);
3784 if (op1->ts.kind < e->ts.kind)
3785 gfc_convert_type (op1, &e->ts, 2);
3786 else if (op2->ts.kind < e->ts.kind)
3787 gfc_convert_type (op2, &e->ts, 2);
3791 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3792 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3793 gfc_typename (&op2->ts));
3798 if (op1->ts.type == BT_LOGICAL)
3800 e->ts.type = BT_LOGICAL;
3801 e->ts.kind = op1->ts.kind;
3805 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3806 gfc_typename (&op1->ts));
3810 case INTRINSIC_GT_OS:
3812 case INTRINSIC_GE_OS:
3814 case INTRINSIC_LT_OS:
3816 case INTRINSIC_LE_OS:
3817 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3819 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3823 /* Fall through... */
3826 case INTRINSIC_EQ_OS:
3828 case INTRINSIC_NE_OS:
3829 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3830 && op1->ts.kind == op2->ts.kind)
3832 e->ts.type = BT_LOGICAL;
3833 e->ts.kind = gfc_default_logical_kind;
3837 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3839 gfc_type_convert_binary (e, 1);
3841 e->ts.type = BT_LOGICAL;
3842 e->ts.kind = gfc_default_logical_kind;
3846 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3848 _("Logicals at %%L must be compared with %s instead of %s"),
3849 (e->value.op.op == INTRINSIC_EQ
3850 || e->value.op.op == INTRINSIC_EQ_OS)
3851 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3854 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3855 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3856 gfc_typename (&op2->ts));
3860 case INTRINSIC_USER:
3861 if (e->value.op.uop->op == NULL)
3862 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3863 else if (op2 == NULL)
3864 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3865 e->value.op.uop->name, gfc_typename (&op1->ts));
3868 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3869 e->value.op.uop->name, gfc_typename (&op1->ts),
3870 gfc_typename (&op2->ts));
3871 e->value.op.uop->op->sym->attr.referenced = 1;
3876 case INTRINSIC_PARENTHESES:
3878 if (e->ts.type == BT_CHARACTER)
3879 e->ts.u.cl = op1->ts.u.cl;
3883 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3886 /* Deal with arrayness of an operand through an operator. */
3890 switch (e->value.op.op)
3892 case INTRINSIC_PLUS:
3893 case INTRINSIC_MINUS:
3894 case INTRINSIC_TIMES:
3895 case INTRINSIC_DIVIDE:
3896 case INTRINSIC_POWER:
3897 case INTRINSIC_CONCAT:
3901 case INTRINSIC_NEQV:
3903 case INTRINSIC_EQ_OS:
3905 case INTRINSIC_NE_OS:
3907 case INTRINSIC_GT_OS:
3909 case INTRINSIC_GE_OS:
3911 case INTRINSIC_LT_OS:
3913 case INTRINSIC_LE_OS:
3915 if (op1->rank == 0 && op2->rank == 0)
3918 if (op1->rank == 0 && op2->rank != 0)
3920 e->rank = op2->rank;
3922 if (e->shape == NULL)
3923 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3926 if (op1->rank != 0 && op2->rank == 0)
3928 e->rank = op1->rank;
3930 if (e->shape == NULL)
3931 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3934 if (op1->rank != 0 && op2->rank != 0)
3936 if (op1->rank == op2->rank)
3938 e->rank = op1->rank;
3939 if (e->shape == NULL)
3941 t = compare_shapes (op1, op2);
3945 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3950 /* Allow higher level expressions to work. */
3953 /* Try user-defined operators, and otherwise throw an error. */
3954 dual_locus_error = true;
3956 _("Inconsistent ranks for operator at %%L and %%L"));
3963 case INTRINSIC_PARENTHESES:
3965 case INTRINSIC_UPLUS:
3966 case INTRINSIC_UMINUS:
3967 /* Simply copy arrayness attribute */
3968 e->rank = op1->rank;
3970 if (e->shape == NULL)
3971 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3979 /* Attempt to simplify the expression. */
3982 t = gfc_simplify_expr (e, 0);
3983 /* Some calls do not succeed in simplification and return FAILURE
3984 even though there is no error; e.g. variable references to
3985 PARAMETER arrays. */
3986 if (!gfc_is_constant_expr (e))
3995 if (gfc_extend_expr (e, &real_error) == SUCCESS)
4002 if (dual_locus_error)
4003 gfc_error (msg, &op1->where, &op2->where);
4005 gfc_error (msg, &e->where);
4011 /************** Array resolution subroutines **************/
4014 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
4017 /* Compare two integer expressions. */
4020 compare_bound (gfc_expr *a, gfc_expr *b)
4024 if (a == NULL || a->expr_type != EXPR_CONSTANT
4025 || b == NULL || b->expr_type != EXPR_CONSTANT)
4028 /* If either of the types isn't INTEGER, we must have
4029 raised an error earlier. */
4031 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
4034 i = mpz_cmp (a->value.integer, b->value.integer);
4044 /* Compare an integer expression with an integer. */
4047 compare_bound_int (gfc_expr *a, int b)
4051 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4054 if (a->ts.type != BT_INTEGER)
4055 gfc_internal_error ("compare_bound_int(): Bad expression");
4057 i = mpz_cmp_si (a->value.integer, b);
4067 /* Compare an integer expression with a mpz_t. */
4070 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
4074 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4077 if (a->ts.type != BT_INTEGER)
4078 gfc_internal_error ("compare_bound_int(): Bad expression");
4080 i = mpz_cmp (a->value.integer, b);
4090 /* Compute the last value of a sequence given by a triplet.
4091 Return 0 if it wasn't able to compute the last value, or if the
4092 sequence if empty, and 1 otherwise. */
4095 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
4096 gfc_expr *stride, mpz_t last)
4100 if (start == NULL || start->expr_type != EXPR_CONSTANT
4101 || end == NULL || end->expr_type != EXPR_CONSTANT
4102 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
4105 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
4106 || (stride != NULL && stride->ts.type != BT_INTEGER))
4109 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
4111 if (compare_bound (start, end) == CMP_GT)
4113 mpz_set (last, end->value.integer);
4117 if (compare_bound_int (stride, 0) == CMP_GT)
4119 /* Stride is positive */
4120 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
4125 /* Stride is negative */
4126 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
4131 mpz_sub (rem, end->value.integer, start->value.integer);
4132 mpz_tdiv_r (rem, rem, stride->value.integer);
4133 mpz_sub (last, end->value.integer, rem);
4140 /* Compare a single dimension of an array reference to the array
4144 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
4148 if (ar->dimen_type[i] == DIMEN_STAR)
4150 gcc_assert (ar->stride[i] == NULL);
4151 /* This implies [*] as [*:] and [*:3] are not possible. */
4152 if (ar->start[i] == NULL)
4154 gcc_assert (ar->end[i] == NULL);
4159 /* Given start, end and stride values, calculate the minimum and
4160 maximum referenced indexes. */
4162 switch (ar->dimen_type[i])
4165 case DIMEN_THIS_IMAGE:
4170 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
4173 gfc_warning ("Array reference at %L is out of bounds "
4174 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4175 mpz_get_si (ar->start[i]->value.integer),
4176 mpz_get_si (as->lower[i]->value.integer), i+1);
4178 gfc_warning ("Array reference at %L is out of bounds "
4179 "(%ld < %ld) in codimension %d", &ar->c_where[i],
4180 mpz_get_si (ar->start[i]->value.integer),
4181 mpz_get_si (as->lower[i]->value.integer),
4185 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
4188 gfc_warning ("Array reference at %L is out of bounds "
4189 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4190 mpz_get_si (ar->start[i]->value.integer),
4191 mpz_get_si (as->upper[i]->value.integer), i+1);
4193 gfc_warning ("Array reference at %L is out of bounds "
4194 "(%ld > %ld) in codimension %d", &ar->c_where[i],
4195 mpz_get_si (ar->start[i]->value.integer),
4196 mpz_get_si (as->upper[i]->value.integer),
4205 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
4206 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
4208 comparison comp_start_end = compare_bound (AR_START, AR_END);
4210 /* Check for zero stride, which is not allowed. */
4211 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
4213 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
4217 /* if start == len || (stride > 0 && start < len)
4218 || (stride < 0 && start > len),
4219 then the array section contains at least one element. In this
4220 case, there is an out-of-bounds access if
4221 (start < lower || start > upper). */
4222 if (compare_bound (AR_START, AR_END) == CMP_EQ
4223 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
4224 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
4225 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
4226 && comp_start_end == CMP_GT))
4228 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
4230 gfc_warning ("Lower array reference at %L is out of bounds "
4231 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4232 mpz_get_si (AR_START->value.integer),
4233 mpz_get_si (as->lower[i]->value.integer), i+1);
4236 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4238 gfc_warning ("Lower array reference at %L is out of bounds "
4239 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4240 mpz_get_si (AR_START->value.integer),
4241 mpz_get_si (as->upper[i]->value.integer), i+1);
4246 /* If we can compute the highest index of the array section,
4247 then it also has to be between lower and upper. */
4248 mpz_init (last_value);
4249 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4252 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4254 gfc_warning ("Upper array reference at %L is out of bounds "
4255 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4256 mpz_get_si (last_value),
4257 mpz_get_si (as->lower[i]->value.integer), i+1);
4258 mpz_clear (last_value);
4261 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4263 gfc_warning ("Upper array reference at %L is out of bounds "
4264 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4265 mpz_get_si (last_value),
4266 mpz_get_si (as->upper[i]->value.integer), i+1);
4267 mpz_clear (last_value);
4271 mpz_clear (last_value);
4279 gfc_internal_error ("check_dimension(): Bad array reference");
4286 /* Compare an array reference with an array specification. */
4289 compare_spec_to_ref (gfc_array_ref *ar)
4296 /* TODO: Full array sections are only allowed as actual parameters. */
4297 if (as->type == AS_ASSUMED_SIZE
4298 && (/*ar->type == AR_FULL
4299 ||*/ (ar->type == AR_SECTION
4300 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4302 gfc_error ("Rightmost upper bound of assumed size array section "
4303 "not specified at %L", &ar->where);
4307 if (ar->type == AR_FULL)
4310 if (as->rank != ar->dimen)
4312 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4313 &ar->where, ar->dimen, as->rank);
4317 /* ar->codimen == 0 is a local array. */
4318 if (as->corank != ar->codimen && ar->codimen != 0)
4320 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4321 &ar->where, ar->codimen, as->corank);
4325 for (i = 0; i < as->rank; i++)
4326 if (check_dimension (i, ar, as) == FAILURE)
4329 /* Local access has no coarray spec. */
4330 if (ar->codimen != 0)
4331 for (i = as->rank; i < as->rank + as->corank; i++)
4333 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate
4334 && ar->dimen_type[i] != DIMEN_THIS_IMAGE)
4336 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4337 i + 1 - as->rank, &ar->where);
4340 if (check_dimension (i, ar, as) == FAILURE)
4344 if (as->corank && ar->codimen == 0)
4347 ar->codimen = as->corank;
4348 for (n = ar->dimen; n < ar->dimen + ar->codimen; n++)
4349 ar->dimen_type[n] = DIMEN_THIS_IMAGE;
4356 /* Resolve one part of an array index. */
4359 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4360 int force_index_integer_kind)
4367 if (gfc_resolve_expr (index) == FAILURE)
4370 if (check_scalar && index->rank != 0)
4372 gfc_error ("Array index at %L must be scalar", &index->where);
4376 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4378 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4379 &index->where, gfc_basic_typename (index->ts.type));
4383 if (index->ts.type == BT_REAL)
4384 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4385 &index->where) == FAILURE)
4388 if ((index->ts.kind != gfc_index_integer_kind
4389 && force_index_integer_kind)
4390 || index->ts.type != BT_INTEGER)
4393 ts.type = BT_INTEGER;
4394 ts.kind = gfc_index_integer_kind;
4396 gfc_convert_type_warn (index, &ts, 2, 0);
4402 /* Resolve one part of an array index. */
4405 gfc_resolve_index (gfc_expr *index, int check_scalar)
4407 return gfc_resolve_index_1 (index, check_scalar, 1);
4410 /* Resolve a dim argument to an intrinsic function. */
4413 gfc_resolve_dim_arg (gfc_expr *dim)
4418 if (gfc_resolve_expr (dim) == FAILURE)
4423 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4428 if (dim->ts.type != BT_INTEGER)
4430 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4434 if (dim->ts.kind != gfc_index_integer_kind)
4439 ts.type = BT_INTEGER;
4440 ts.kind = gfc_index_integer_kind;
4442 gfc_convert_type_warn (dim, &ts, 2, 0);
4448 /* Given an expression that contains array references, update those array
4449 references to point to the right array specifications. While this is
4450 filled in during matching, this information is difficult to save and load
4451 in a module, so we take care of it here.
4453 The idea here is that the original array reference comes from the
4454 base symbol. We traverse the list of reference structures, setting
4455 the stored reference to references. Component references can
4456 provide an additional array specification. */
4459 find_array_spec (gfc_expr *e)
4463 gfc_symbol *derived;
4466 if (e->symtree->n.sym->ts.type == BT_CLASS)
4467 as = CLASS_DATA (e->symtree->n.sym)->as;
4469 as = e->symtree->n.sym->as;
4472 for (ref = e->ref; ref; ref = ref->next)
4477 gfc_internal_error ("find_array_spec(): Missing spec");
4484 if (derived == NULL)
4485 derived = e->symtree->n.sym->ts.u.derived;
4487 if (derived->attr.is_class)
4488 derived = derived->components->ts.u.derived;
4490 c = derived->components;
4492 for (; c; c = c->next)
4493 if (c == ref->u.c.component)
4495 /* Track the sequence of component references. */
4496 if (c->ts.type == BT_DERIVED)
4497 derived = c->ts.u.derived;
4502 gfc_internal_error ("find_array_spec(): Component not found");
4504 if (c->attr.dimension)
4507 gfc_internal_error ("find_array_spec(): unused as(1)");
4518 gfc_internal_error ("find_array_spec(): unused as(2)");
4522 /* Resolve an array reference. */
4525 resolve_array_ref (gfc_array_ref *ar)
4527 int i, check_scalar;
4530 for (i = 0; i < ar->dimen + ar->codimen; i++)
4532 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4534 /* Do not force gfc_index_integer_kind for the start. We can
4535 do fine with any integer kind. This avoids temporary arrays
4536 created for indexing with a vector. */
4537 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4539 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4541 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4546 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4550 ar->dimen_type[i] = DIMEN_ELEMENT;
4554 ar->dimen_type[i] = DIMEN_VECTOR;
4555 if (e->expr_type == EXPR_VARIABLE
4556 && e->symtree->n.sym->ts.type == BT_DERIVED)
4557 ar->start[i] = gfc_get_parentheses (e);
4561 gfc_error ("Array index at %L is an array of rank %d",
4562 &ar->c_where[i], e->rank);
4566 /* Fill in the upper bound, which may be lower than the
4567 specified one for something like a(2:10:5), which is
4568 identical to a(2:7:5). Only relevant for strides not equal
4570 if (ar->dimen_type[i] == DIMEN_RANGE
4571 && ar->stride[i] != NULL && ar->stride[i]->expr_type == EXPR_CONSTANT
4572 && mpz_cmp_si (ar->stride[i]->value.integer, 1L) != 0)
4576 if (gfc_ref_dimen_size (ar, i, &size, &end) == SUCCESS)
4578 if (ar->end[i] == NULL)
4581 gfc_get_constant_expr (BT_INTEGER, gfc_index_integer_kind,
4583 mpz_set (ar->end[i]->value.integer, end);
4585 else if (ar->end[i]->ts.type == BT_INTEGER
4586 && ar->end[i]->expr_type == EXPR_CONSTANT)
4588 mpz_set (ar->end[i]->value.integer, end);
4599 if (ar->type == AR_FULL && ar->as->rank == 0)
4600 ar->type = AR_ELEMENT;
4602 /* If the reference type is unknown, figure out what kind it is. */
4604 if (ar->type == AR_UNKNOWN)
4606 ar->type = AR_ELEMENT;
4607 for (i = 0; i < ar->dimen; i++)
4608 if (ar->dimen_type[i] == DIMEN_RANGE
4609 || ar->dimen_type[i] == DIMEN_VECTOR)
4611 ar->type = AR_SECTION;
4616 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4624 resolve_substring (gfc_ref *ref)
4626 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4628 if (ref->u.ss.start != NULL)
4630 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4633 if (ref->u.ss.start->ts.type != BT_INTEGER)
4635 gfc_error ("Substring start index at %L must be of type INTEGER",
4636 &ref->u.ss.start->where);
4640 if (ref->u.ss.start->rank != 0)
4642 gfc_error ("Substring start index at %L must be scalar",
4643 &ref->u.ss.start->where);
4647 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4648 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4649 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4651 gfc_error ("Substring start index at %L is less than one",
4652 &ref->u.ss.start->where);
4657 if (ref->u.ss.end != NULL)
4659 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4662 if (ref->u.ss.end->ts.type != BT_INTEGER)
4664 gfc_error ("Substring end index at %L must be of type INTEGER",
4665 &ref->u.ss.end->where);
4669 if (ref->u.ss.end->rank != 0)
4671 gfc_error ("Substring end index at %L must be scalar",
4672 &ref->u.ss.end->where);
4676 if (ref->u.ss.length != NULL
4677 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4678 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4679 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4681 gfc_error ("Substring end index at %L exceeds the string length",
4682 &ref->u.ss.start->where);
4686 if (compare_bound_mpz_t (ref->u.ss.end,
4687 gfc_integer_kinds[k].huge) == CMP_GT
4688 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4689 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4691 gfc_error ("Substring end index at %L is too large",
4692 &ref->u.ss.end->where);
4701 /* This function supplies missing substring charlens. */
4704 gfc_resolve_substring_charlen (gfc_expr *e)
4707 gfc_expr *start, *end;
4709 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4710 if (char_ref->type == REF_SUBSTRING)
4716 gcc_assert (char_ref->next == NULL);
4720 if (e->ts.u.cl->length)
4721 gfc_free_expr (e->ts.u.cl->length);
4722 else if (e->expr_type == EXPR_VARIABLE
4723 && e->symtree->n.sym->attr.dummy)
4727 e->ts.type = BT_CHARACTER;
4728 e->ts.kind = gfc_default_character_kind;
4731 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4733 if (char_ref->u.ss.start)
4734 start = gfc_copy_expr (char_ref->u.ss.start);
4736 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4738 if (char_ref->u.ss.end)
4739 end = gfc_copy_expr (char_ref->u.ss.end);
4740 else if (e->expr_type == EXPR_VARIABLE)
4741 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4748 /* Length = (end - start +1). */
4749 e->ts.u.cl->length = gfc_subtract (end, start);
4750 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4751 gfc_get_int_expr (gfc_default_integer_kind,
4754 e->ts.u.cl->length->ts.type = BT_INTEGER;
4755 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4757 /* Make sure that the length is simplified. */
4758 gfc_simplify_expr (e->ts.u.cl->length, 1);
4759 gfc_resolve_expr (e->ts.u.cl->length);
4763 /* Resolve subtype references. */
4766 resolve_ref (gfc_expr *expr)
4768 int current_part_dimension, n_components, seen_part_dimension;
4771 for (ref = expr->ref; ref; ref = ref->next)
4772 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4774 find_array_spec (expr);
4778 for (ref = expr->ref; ref; ref = ref->next)
4782 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4790 resolve_substring (ref);
4794 /* Check constraints on part references. */
4796 current_part_dimension = 0;
4797 seen_part_dimension = 0;
4800 for (ref = expr->ref; ref; ref = ref->next)
4805 switch (ref->u.ar.type)
4808 /* Coarray scalar. */
4809 if (ref->u.ar.as->rank == 0)
4811 current_part_dimension = 0;
4816 current_part_dimension = 1;
4820 current_part_dimension = 0;
4824 gfc_internal_error ("resolve_ref(): Bad array reference");
4830 if (current_part_dimension || seen_part_dimension)
4833 if (ref->u.c.component->attr.pointer
4834 || ref->u.c.component->attr.proc_pointer)
4836 gfc_error ("Component to the right of a part reference "
4837 "with nonzero rank must not have the POINTER "
4838 "attribute at %L", &expr->where);
4841 else if (ref->u.c.component->attr.allocatable)
4843 gfc_error ("Component to the right of a part reference "
4844 "with nonzero rank must not have the ALLOCATABLE "
4845 "attribute at %L", &expr->where);
4857 if (((ref->type == REF_COMPONENT && n_components > 1)
4858 || ref->next == NULL)
4859 && current_part_dimension
4860 && seen_part_dimension)
4862 gfc_error ("Two or more part references with nonzero rank must "
4863 "not be specified at %L", &expr->where);
4867 if (ref->type == REF_COMPONENT)
4869 if (current_part_dimension)
4870 seen_part_dimension = 1;
4872 /* reset to make sure */
4873 current_part_dimension = 0;
4881 /* Given an expression, determine its shape. This is easier than it sounds.
4882 Leaves the shape array NULL if it is not possible to determine the shape. */
4885 expression_shape (gfc_expr *e)
4887 mpz_t array[GFC_MAX_DIMENSIONS];
4890 if (e->rank == 0 || e->shape != NULL)
4893 for (i = 0; i < e->rank; i++)
4894 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4897 e->shape = gfc_get_shape (e->rank);
4899 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4904 for (i--; i >= 0; i--)
4905 mpz_clear (array[i]);
4909 /* Given a variable expression node, compute the rank of the expression by
4910 examining the base symbol and any reference structures it may have. */
4913 expression_rank (gfc_expr *e)
4918 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4919 could lead to serious confusion... */
4920 gcc_assert (e->expr_type != EXPR_COMPCALL);
4924 if (e->expr_type == EXPR_ARRAY)
4926 /* Constructors can have a rank different from one via RESHAPE(). */
4928 if (e->symtree == NULL)
4934 e->rank = (e->symtree->n.sym->as == NULL)
4935 ? 0 : e->symtree->n.sym->as->rank;
4941 for (ref = e->ref; ref; ref = ref->next)
4943 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.proc_pointer
4944 && ref->u.c.component->attr.function && !ref->next)
4945 rank = ref->u.c.component->as ? ref->u.c.component->as->rank : 0;
4947 if (ref->type != REF_ARRAY)
4950 if (ref->u.ar.type == AR_FULL)
4952 rank = ref->u.ar.as->rank;
4956 if (ref->u.ar.type == AR_SECTION)
4958 /* Figure out the rank of the section. */
4960 gfc_internal_error ("expression_rank(): Two array specs");
4962 for (i = 0; i < ref->u.ar.dimen; i++)
4963 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
4964 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
4974 expression_shape (e);
4978 /* Resolve a variable expression. */
4981 resolve_variable (gfc_expr *e)
4988 if (e->symtree == NULL)
4990 sym = e->symtree->n.sym;
4992 /* If this is an associate-name, it may be parsed with an array reference
4993 in error even though the target is scalar. Fail directly in this case. */
4994 if (sym->assoc && !sym->attr.dimension && e->ref && e->ref->type == REF_ARRAY)
4997 /* On the other hand, the parser may not have known this is an array;
4998 in this case, we have to add a FULL reference. */
4999 if (sym->assoc && sym->attr.dimension && !e->ref)
5001 e->ref = gfc_get_ref ();
5002 e->ref->type = REF_ARRAY;
5003 e->ref->u.ar.type = AR_FULL;
5004 e->ref->u.ar.dimen = 0;
5007 if (e->ref && resolve_ref (e) == FAILURE)
5010 if (sym->attr.flavor == FL_PROCEDURE
5011 && (!sym->attr.function
5012 || (sym->attr.function && sym->result
5013 && sym->result->attr.proc_pointer
5014 && !sym->result->attr.function)))
5016 e->ts.type = BT_PROCEDURE;
5017 goto resolve_procedure;
5020 if (sym->ts.type != BT_UNKNOWN)
5021 gfc_variable_attr (e, &e->ts);
5024 /* Must be a simple variable reference. */
5025 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
5030 if (check_assumed_size_reference (sym, e))
5033 /* Deal with forward references to entries during resolve_code, to
5034 satisfy, at least partially, 12.5.2.5. */
5035 if (gfc_current_ns->entries
5036 && current_entry_id == sym->entry_id
5039 && cs_base->current->op != EXEC_ENTRY)
5041 gfc_entry_list *entry;
5042 gfc_formal_arglist *formal;
5046 /* If the symbol is a dummy... */
5047 if (sym->attr.dummy && sym->ns == gfc_current_ns)
5049 entry = gfc_current_ns->entries;
5052 /* ...test if the symbol is a parameter of previous entries. */
5053 for (; entry && entry->id <= current_entry_id; entry = entry->next)
5054 for (formal = entry->sym->formal; formal; formal = formal->next)
5056 if (formal->sym && sym->name == formal->sym->name)
5060 /* If it has not been seen as a dummy, this is an error. */
5063 if (specification_expr)
5064 gfc_error ("Variable '%s', used in a specification expression"
5065 ", is referenced at %L before the ENTRY statement "
5066 "in which it is a parameter",
5067 sym->name, &cs_base->current->loc);
5069 gfc_error ("Variable '%s' is used at %L before the ENTRY "
5070 "statement in which it is a parameter",
5071 sym->name, &cs_base->current->loc);
5076 /* Now do the same check on the specification expressions. */
5077 specification_expr = 1;
5078 if (sym->ts.type == BT_CHARACTER
5079 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
5083 for (n = 0; n < sym->as->rank; n++)
5085 specification_expr = 1;
5086 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
5088 specification_expr = 1;
5089 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
5092 specification_expr = 0;
5095 /* Update the symbol's entry level. */
5096 sym->entry_id = current_entry_id + 1;
5099 /* If a symbol has been host_associated mark it. This is used latter,
5100 to identify if aliasing is possible via host association. */
5101 if (sym->attr.flavor == FL_VARIABLE
5102 && gfc_current_ns->parent
5103 && (gfc_current_ns->parent == sym->ns
5104 || (gfc_current_ns->parent->parent
5105 && gfc_current_ns->parent->parent == sym->ns)))
5106 sym->attr.host_assoc = 1;
5109 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
5112 /* F2008, C617 and C1229. */
5113 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
5114 && gfc_is_coindexed (e))
5116 gfc_ref *ref, *ref2 = NULL;
5118 for (ref = e->ref; ref; ref = ref->next)
5120 if (ref->type == REF_COMPONENT)
5122 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
5126 for ( ; ref; ref = ref->next)
5127 if (ref->type == REF_COMPONENT)
5130 /* Expression itself is not coindexed object. */
5131 if (ref && e->ts.type == BT_CLASS)
5133 gfc_error ("Polymorphic subobject of coindexed object at %L",
5138 /* Expression itself is coindexed object. */
5142 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
5143 for ( ; c; c = c->next)
5144 if (c->attr.allocatable && c->ts.type == BT_CLASS)
5146 gfc_error ("Coindexed object with polymorphic allocatable "
5147 "subcomponent at %L", &e->where);
5158 /* Checks to see that the correct symbol has been host associated.
5159 The only situation where this arises is that in which a twice
5160 contained function is parsed after the host association is made.
5161 Therefore, on detecting this, change the symbol in the expression
5162 and convert the array reference into an actual arglist if the old
5163 symbol is a variable. */
5165 check_host_association (gfc_expr *e)
5167 gfc_symbol *sym, *old_sym;
5171 gfc_actual_arglist *arg, *tail = NULL;
5172 bool retval = e->expr_type == EXPR_FUNCTION;
5174 /* If the expression is the result of substitution in
5175 interface.c(gfc_extend_expr) because there is no way in
5176 which the host association can be wrong. */
5177 if (e->symtree == NULL
5178 || e->symtree->n.sym == NULL
5179 || e->user_operator)
5182 old_sym = e->symtree->n.sym;
5184 if (gfc_current_ns->parent
5185 && old_sym->ns != gfc_current_ns)
5187 /* Use the 'USE' name so that renamed module symbols are
5188 correctly handled. */
5189 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
5191 if (sym && old_sym != sym
5192 && sym->ts.type == old_sym->ts.type
5193 && sym->attr.flavor == FL_PROCEDURE
5194 && sym->attr.contained)
5196 /* Clear the shape, since it might not be valid. */
5197 if (e->shape != NULL)
5199 for (n = 0; n < e->rank; n++)
5200 mpz_clear (e->shape[n]);
5205 /* Give the expression the right symtree! */
5206 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
5207 gcc_assert (st != NULL);
5209 if (old_sym->attr.flavor == FL_PROCEDURE
5210 || e->expr_type == EXPR_FUNCTION)
5212 /* Original was function so point to the new symbol, since
5213 the actual argument list is already attached to the
5215 e->value.function.esym = NULL;
5220 /* Original was variable so convert array references into
5221 an actual arglist. This does not need any checking now
5222 since gfc_resolve_function will take care of it. */
5223 e->value.function.actual = NULL;
5224 e->expr_type = EXPR_FUNCTION;
5227 /* Ambiguity will not arise if the array reference is not
5228 the last reference. */
5229 for (ref = e->ref; ref; ref = ref->next)
5230 if (ref->type == REF_ARRAY && ref->next == NULL)
5233 gcc_assert (ref->type == REF_ARRAY);
5235 /* Grab the start expressions from the array ref and
5236 copy them into actual arguments. */
5237 for (n = 0; n < ref->u.ar.dimen; n++)
5239 arg = gfc_get_actual_arglist ();
5240 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
5241 if (e->value.function.actual == NULL)
5242 tail = e->value.function.actual = arg;
5250 /* Dump the reference list and set the rank. */
5251 gfc_free_ref_list (e->ref);
5253 e->rank = sym->as ? sym->as->rank : 0;
5256 gfc_resolve_expr (e);
5260 /* This might have changed! */
5261 return e->expr_type == EXPR_FUNCTION;
5266 gfc_resolve_character_operator (gfc_expr *e)
5268 gfc_expr *op1 = e->value.op.op1;
5269 gfc_expr *op2 = e->value.op.op2;
5270 gfc_expr *e1 = NULL;
5271 gfc_expr *e2 = NULL;
5273 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
5275 if (op1->ts.u.cl && op1->ts.u.cl->length)
5276 e1 = gfc_copy_expr (op1->ts.u.cl->length);
5277 else if (op1->expr_type == EXPR_CONSTANT)
5278 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5279 op1->value.character.length);
5281 if (op2->ts.u.cl && op2->ts.u.cl->length)
5282 e2 = gfc_copy_expr (op2->ts.u.cl->length);
5283 else if (op2->expr_type == EXPR_CONSTANT)
5284 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5285 op2->value.character.length);
5287 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5292 e->ts.u.cl->length = gfc_add (e1, e2);
5293 e->ts.u.cl->length->ts.type = BT_INTEGER;
5294 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
5295 gfc_simplify_expr (e->ts.u.cl->length, 0);
5296 gfc_resolve_expr (e->ts.u.cl->length);
5302 /* Ensure that an character expression has a charlen and, if possible, a
5303 length expression. */
5306 fixup_charlen (gfc_expr *e)
5308 /* The cases fall through so that changes in expression type and the need
5309 for multiple fixes are picked up. In all circumstances, a charlen should
5310 be available for the middle end to hang a backend_decl on. */
5311 switch (e->expr_type)
5314 gfc_resolve_character_operator (e);
5317 if (e->expr_type == EXPR_ARRAY)
5318 gfc_resolve_character_array_constructor (e);
5320 case EXPR_SUBSTRING:
5321 if (!e->ts.u.cl && e->ref)
5322 gfc_resolve_substring_charlen (e);
5326 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5333 /* Update an actual argument to include the passed-object for type-bound
5334 procedures at the right position. */
5336 static gfc_actual_arglist*
5337 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5340 gcc_assert (argpos > 0);
5344 gfc_actual_arglist* result;
5346 result = gfc_get_actual_arglist ();
5350 result->name = name;
5356 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5358 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5363 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5366 extract_compcall_passed_object (gfc_expr* e)
5370 gcc_assert (e->expr_type == EXPR_COMPCALL);
5372 if (e->value.compcall.base_object)
5373 po = gfc_copy_expr (e->value.compcall.base_object);
5376 po = gfc_get_expr ();
5377 po->expr_type = EXPR_VARIABLE;
5378 po->symtree = e->symtree;
5379 po->ref = gfc_copy_ref (e->ref);
5380 po->where = e->where;
5383 if (gfc_resolve_expr (po) == FAILURE)
5390 /* Update the arglist of an EXPR_COMPCALL expression to include the
5394 update_compcall_arglist (gfc_expr* e)
5397 gfc_typebound_proc* tbp;
5399 tbp = e->value.compcall.tbp;
5404 po = extract_compcall_passed_object (e);
5408 if (tbp->nopass || e->value.compcall.ignore_pass)
5414 gcc_assert (tbp->pass_arg_num > 0);
5415 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5423 /* Extract the passed object from a PPC call (a copy of it). */
5426 extract_ppc_passed_object (gfc_expr *e)
5431 po = gfc_get_expr ();
5432 po->expr_type = EXPR_VARIABLE;
5433 po->symtree = e->symtree;
5434 po->ref = gfc_copy_ref (e->ref);
5435 po->where = e->where;
5437 /* Remove PPC reference. */
5439 while ((*ref)->next)
5440 ref = &(*ref)->next;
5441 gfc_free_ref_list (*ref);
5444 if (gfc_resolve_expr (po) == FAILURE)
5451 /* Update the actual arglist of a procedure pointer component to include the
5455 update_ppc_arglist (gfc_expr* e)
5459 gfc_typebound_proc* tb;
5461 if (!gfc_is_proc_ptr_comp (e, &ppc))
5468 else if (tb->nopass)
5471 po = extract_ppc_passed_object (e);
5478 gfc_error ("Passed-object at %L must be scalar", &e->where);
5483 if (po->ts.type == BT_DERIVED && po->ts.u.derived->attr.abstract)
5485 gfc_error ("Base object for procedure-pointer component call at %L is of"
5486 " ABSTRACT type '%s'", &e->where, po->ts.u.derived->name);
5490 gcc_assert (tb->pass_arg_num > 0);
5491 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5499 /* Check that the object a TBP is called on is valid, i.e. it must not be
5500 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5503 check_typebound_baseobject (gfc_expr* e)
5506 gfc_try return_value = FAILURE;
5508 base = extract_compcall_passed_object (e);
5512 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5515 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5517 gfc_error ("Base object for type-bound procedure call at %L is of"
5518 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5522 /* F08:C1230. If the procedure called is NOPASS,
5523 the base object must be scalar. */
5524 if (e->value.compcall.tbp->nopass && base->rank > 0)
5526 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5527 " be scalar", &e->where);
5531 /* FIXME: Remove once PR 43214 is fixed (TBP with non-scalar PASS). */
5534 gfc_error ("Non-scalar base object at %L currently not implemented",
5539 return_value = SUCCESS;
5542 gfc_free_expr (base);
5543 return return_value;
5547 /* Resolve a call to a type-bound procedure, either function or subroutine,
5548 statically from the data in an EXPR_COMPCALL expression. The adapted
5549 arglist and the target-procedure symtree are returned. */
5552 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5553 gfc_actual_arglist** actual)
5555 gcc_assert (e->expr_type == EXPR_COMPCALL);
5556 gcc_assert (!e->value.compcall.tbp->is_generic);
5558 /* Update the actual arglist for PASS. */
5559 if (update_compcall_arglist (e) == FAILURE)
5562 *actual = e->value.compcall.actual;
5563 *target = e->value.compcall.tbp->u.specific;
5565 gfc_free_ref_list (e->ref);
5567 e->value.compcall.actual = NULL;
5573 /* Get the ultimate declared type from an expression. In addition,
5574 return the last class/derived type reference and the copy of the
5577 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5580 gfc_symbol *declared;
5587 *new_ref = gfc_copy_ref (e->ref);
5589 for (ref = e->ref; ref; ref = ref->next)
5591 if (ref->type != REF_COMPONENT)
5594 if (ref->u.c.component->ts.type == BT_CLASS
5595 || ref->u.c.component->ts.type == BT_DERIVED)
5597 declared = ref->u.c.component->ts.u.derived;
5603 if (declared == NULL)
5604 declared = e->symtree->n.sym->ts.u.derived;
5610 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5611 which of the specific bindings (if any) matches the arglist and transform
5612 the expression into a call of that binding. */
5615 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5617 gfc_typebound_proc* genproc;
5618 const char* genname;
5620 gfc_symbol *derived;
5622 gcc_assert (e->expr_type == EXPR_COMPCALL);
5623 genname = e->value.compcall.name;
5624 genproc = e->value.compcall.tbp;
5626 if (!genproc->is_generic)
5629 /* Try the bindings on this type and in the inheritance hierarchy. */
5630 for (; genproc; genproc = genproc->overridden)
5634 gcc_assert (genproc->is_generic);
5635 for (g = genproc->u.generic; g; g = g->next)
5638 gfc_actual_arglist* args;
5641 gcc_assert (g->specific);
5643 if (g->specific->error)
5646 target = g->specific->u.specific->n.sym;
5648 /* Get the right arglist by handling PASS/NOPASS. */
5649 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5650 if (!g->specific->nopass)
5653 po = extract_compcall_passed_object (e);
5657 gcc_assert (g->specific->pass_arg_num > 0);
5658 gcc_assert (!g->specific->error);
5659 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5660 g->specific->pass_arg);
5662 resolve_actual_arglist (args, target->attr.proc,
5663 is_external_proc (target) && !target->formal);
5665 /* Check if this arglist matches the formal. */
5666 matches = gfc_arglist_matches_symbol (&args, target);
5668 /* Clean up and break out of the loop if we've found it. */
5669 gfc_free_actual_arglist (args);
5672 e->value.compcall.tbp = g->specific;
5673 genname = g->specific_st->name;
5674 /* Pass along the name for CLASS methods, where the vtab
5675 procedure pointer component has to be referenced. */
5683 /* Nothing matching found! */
5684 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5685 " '%s' at %L", genname, &e->where);
5689 /* Make sure that we have the right specific instance for the name. */
5690 derived = get_declared_from_expr (NULL, NULL, e);
5692 st = gfc_find_typebound_proc (derived, NULL, genname, true, &e->where);
5694 e->value.compcall.tbp = st->n.tb;
5700 /* Resolve a call to a type-bound subroutine. */
5703 resolve_typebound_call (gfc_code* c, const char **name)
5705 gfc_actual_arglist* newactual;
5706 gfc_symtree* target;
5708 /* Check that's really a SUBROUTINE. */
5709 if (!c->expr1->value.compcall.tbp->subroutine)
5711 gfc_error ("'%s' at %L should be a SUBROUTINE",
5712 c->expr1->value.compcall.name, &c->loc);
5716 if (check_typebound_baseobject (c->expr1) == FAILURE)
5719 /* Pass along the name for CLASS methods, where the vtab
5720 procedure pointer component has to be referenced. */
5722 *name = c->expr1->value.compcall.name;
5724 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5727 /* Transform into an ordinary EXEC_CALL for now. */
5729 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5732 c->ext.actual = newactual;
5733 c->symtree = target;
5734 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5736 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5738 gfc_free_expr (c->expr1);
5739 c->expr1 = gfc_get_expr ();
5740 c->expr1->expr_type = EXPR_FUNCTION;
5741 c->expr1->symtree = target;
5742 c->expr1->where = c->loc;
5744 return resolve_call (c);
5748 /* Resolve a component-call expression. */
5750 resolve_compcall (gfc_expr* e, const char **name)
5752 gfc_actual_arglist* newactual;
5753 gfc_symtree* target;
5755 /* Check that's really a FUNCTION. */
5756 if (!e->value.compcall.tbp->function)
5758 gfc_error ("'%s' at %L should be a FUNCTION",
5759 e->value.compcall.name, &e->where);
5763 /* These must not be assign-calls! */
5764 gcc_assert (!e->value.compcall.assign);
5766 if (check_typebound_baseobject (e) == FAILURE)
5769 /* Pass along the name for CLASS methods, where the vtab
5770 procedure pointer component has to be referenced. */
5772 *name = e->value.compcall.name;
5774 if (resolve_typebound_generic_call (e, name) == FAILURE)
5776 gcc_assert (!e->value.compcall.tbp->is_generic);
5778 /* Take the rank from the function's symbol. */
5779 if (e->value.compcall.tbp->u.specific->n.sym->as)
5780 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5782 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5783 arglist to the TBP's binding target. */
5785 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5788 e->value.function.actual = newactual;
5789 e->value.function.name = NULL;
5790 e->value.function.esym = target->n.sym;
5791 e->value.function.isym = NULL;
5792 e->symtree = target;
5793 e->ts = target->n.sym->ts;
5794 e->expr_type = EXPR_FUNCTION;
5796 /* Resolution is not necessary if this is a class subroutine; this
5797 function only has to identify the specific proc. Resolution of
5798 the call will be done next in resolve_typebound_call. */
5799 return gfc_resolve_expr (e);
5804 /* Resolve a typebound function, or 'method'. First separate all
5805 the non-CLASS references by calling resolve_compcall directly. */
5808 resolve_typebound_function (gfc_expr* e)
5810 gfc_symbol *declared;
5821 /* Deal with typebound operators for CLASS objects. */
5822 expr = e->value.compcall.base_object;
5823 if (expr && expr->ts.type == BT_CLASS && e->value.compcall.name)
5825 /* Since the typebound operators are generic, we have to ensure
5826 that any delays in resolution are corrected and that the vtab
5829 declared = ts.u.derived;
5830 c = gfc_find_component (declared, "_vptr", true, true);
5831 if (c->ts.u.derived == NULL)
5832 c->ts.u.derived = gfc_find_derived_vtab (declared);
5834 if (resolve_compcall (e, &name) == FAILURE)
5837 /* Use the generic name if it is there. */
5838 name = name ? name : e->value.function.esym->name;
5839 e->symtree = expr->symtree;
5840 e->ref = gfc_copy_ref (expr->ref);
5841 gfc_add_vptr_component (e);
5842 gfc_add_component_ref (e, name);
5843 e->value.function.esym = NULL;
5848 return resolve_compcall (e, NULL);
5850 if (resolve_ref (e) == FAILURE)
5853 /* Get the CLASS declared type. */
5854 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5856 /* Weed out cases of the ultimate component being a derived type. */
5857 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5858 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5860 gfc_free_ref_list (new_ref);
5861 return resolve_compcall (e, NULL);
5864 c = gfc_find_component (declared, "_data", true, true);
5865 declared = c->ts.u.derived;
5867 /* Treat the call as if it is a typebound procedure, in order to roll
5868 out the correct name for the specific function. */
5869 if (resolve_compcall (e, &name) == FAILURE)
5873 /* Then convert the expression to a procedure pointer component call. */
5874 e->value.function.esym = NULL;
5880 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5881 gfc_add_vptr_component (e);
5882 gfc_add_component_ref (e, name);
5884 /* Recover the typespec for the expression. This is really only
5885 necessary for generic procedures, where the additional call
5886 to gfc_add_component_ref seems to throw the collection of the
5887 correct typespec. */
5892 /* Resolve a typebound subroutine, or 'method'. First separate all
5893 the non-CLASS references by calling resolve_typebound_call
5897 resolve_typebound_subroutine (gfc_code *code)
5899 gfc_symbol *declared;
5908 st = code->expr1->symtree;
5910 /* Deal with typebound operators for CLASS objects. */
5911 expr = code->expr1->value.compcall.base_object;
5912 if (expr && expr->ts.type == BT_CLASS && code->expr1->value.compcall.name)
5914 /* Since the typebound operators are generic, we have to ensure
5915 that any delays in resolution are corrected and that the vtab
5917 declared = expr->ts.u.derived;
5918 c = gfc_find_component (declared, "_vptr", true, true);
5919 if (c->ts.u.derived == NULL)
5920 c->ts.u.derived = gfc_find_derived_vtab (declared);
5922 if (resolve_typebound_call (code, &name) == FAILURE)
5925 /* Use the generic name if it is there. */
5926 name = name ? name : code->expr1->value.function.esym->name;
5927 code->expr1->symtree = expr->symtree;
5928 code->expr1->ref = gfc_copy_ref (expr->ref);
5929 gfc_add_vptr_component (code->expr1);
5930 gfc_add_component_ref (code->expr1, name);
5931 code->expr1->value.function.esym = NULL;
5936 return resolve_typebound_call (code, NULL);
5938 if (resolve_ref (code->expr1) == FAILURE)
5941 /* Get the CLASS declared type. */
5942 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
5944 /* Weed out cases of the ultimate component being a derived type. */
5945 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5946 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5948 gfc_free_ref_list (new_ref);
5949 return resolve_typebound_call (code, NULL);
5952 if (resolve_typebound_call (code, &name) == FAILURE)
5954 ts = code->expr1->ts;
5956 /* Then convert the expression to a procedure pointer component call. */
5957 code->expr1->value.function.esym = NULL;
5958 code->expr1->symtree = st;
5961 code->expr1->ref = new_ref;
5963 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5964 gfc_add_vptr_component (code->expr1);
5965 gfc_add_component_ref (code->expr1, name);
5967 /* Recover the typespec for the expression. This is really only
5968 necessary for generic procedures, where the additional call
5969 to gfc_add_component_ref seems to throw the collection of the
5970 correct typespec. */
5971 code->expr1->ts = ts;
5976 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
5979 resolve_ppc_call (gfc_code* c)
5981 gfc_component *comp;
5984 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
5987 c->resolved_sym = c->expr1->symtree->n.sym;
5988 c->expr1->expr_type = EXPR_VARIABLE;
5990 if (!comp->attr.subroutine)
5991 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
5993 if (resolve_ref (c->expr1) == FAILURE)
5996 if (update_ppc_arglist (c->expr1) == FAILURE)
5999 c->ext.actual = c->expr1->value.compcall.actual;
6001 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
6002 comp->formal == NULL) == FAILURE)
6005 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
6011 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
6014 resolve_expr_ppc (gfc_expr* e)
6016 gfc_component *comp;
6019 b = gfc_is_proc_ptr_comp (e, &comp);
6022 /* Convert to EXPR_FUNCTION. */
6023 e->expr_type = EXPR_FUNCTION;
6024 e->value.function.isym = NULL;
6025 e->value.function.actual = e->value.compcall.actual;
6027 if (comp->as != NULL)
6028 e->rank = comp->as->rank;
6030 if (!comp->attr.function)
6031 gfc_add_function (&comp->attr, comp->name, &e->where);
6033 if (resolve_ref (e) == FAILURE)
6036 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
6037 comp->formal == NULL) == FAILURE)
6040 if (update_ppc_arglist (e) == FAILURE)
6043 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
6050 gfc_is_expandable_expr (gfc_expr *e)
6052 gfc_constructor *con;
6054 if (e->expr_type == EXPR_ARRAY)
6056 /* Traverse the constructor looking for variables that are flavor
6057 parameter. Parameters must be expanded since they are fully used at
6059 con = gfc_constructor_first (e->value.constructor);
6060 for (; con; con = gfc_constructor_next (con))
6062 if (con->expr->expr_type == EXPR_VARIABLE
6063 && con->expr->symtree
6064 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
6065 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
6067 if (con->expr->expr_type == EXPR_ARRAY
6068 && gfc_is_expandable_expr (con->expr))
6076 /* Resolve an expression. That is, make sure that types of operands agree
6077 with their operators, intrinsic operators are converted to function calls
6078 for overloaded types and unresolved function references are resolved. */
6081 gfc_resolve_expr (gfc_expr *e)
6089 /* inquiry_argument only applies to variables. */
6090 inquiry_save = inquiry_argument;
6091 if (e->expr_type != EXPR_VARIABLE)
6092 inquiry_argument = false;
6094 switch (e->expr_type)
6097 t = resolve_operator (e);
6103 if (check_host_association (e))
6104 t = resolve_function (e);
6107 t = resolve_variable (e);
6109 expression_rank (e);
6112 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
6113 && e->ref->type != REF_SUBSTRING)
6114 gfc_resolve_substring_charlen (e);
6119 t = resolve_typebound_function (e);
6122 case EXPR_SUBSTRING:
6123 t = resolve_ref (e);
6132 t = resolve_expr_ppc (e);
6137 if (resolve_ref (e) == FAILURE)
6140 t = gfc_resolve_array_constructor (e);
6141 /* Also try to expand a constructor. */
6144 expression_rank (e);
6145 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
6146 gfc_expand_constructor (e, false);
6149 /* This provides the opportunity for the length of constructors with
6150 character valued function elements to propagate the string length
6151 to the expression. */
6152 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
6154 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
6155 here rather then add a duplicate test for it above. */
6156 gfc_expand_constructor (e, false);
6157 t = gfc_resolve_character_array_constructor (e);
6162 case EXPR_STRUCTURE:
6163 t = resolve_ref (e);
6167 t = resolve_structure_cons (e, 0);
6171 t = gfc_simplify_expr (e, 0);
6175 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
6178 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
6181 inquiry_argument = inquiry_save;
6187 /* Resolve an expression from an iterator. They must be scalar and have
6188 INTEGER or (optionally) REAL type. */
6191 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
6192 const char *name_msgid)
6194 if (gfc_resolve_expr (expr) == FAILURE)
6197 if (expr->rank != 0)
6199 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
6203 if (expr->ts.type != BT_INTEGER)
6205 if (expr->ts.type == BT_REAL)
6208 return gfc_notify_std (GFC_STD_F95_DEL,
6209 "Deleted feature: %s at %L must be integer",
6210 _(name_msgid), &expr->where);
6213 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
6220 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
6228 /* Resolve the expressions in an iterator structure. If REAL_OK is
6229 false allow only INTEGER type iterators, otherwise allow REAL types. */
6232 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
6234 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
6238 if (gfc_check_vardef_context (iter->var, false, _("iterator variable"))
6242 if (gfc_resolve_iterator_expr (iter->start, real_ok,
6243 "Start expression in DO loop") == FAILURE)
6246 if (gfc_resolve_iterator_expr (iter->end, real_ok,
6247 "End expression in DO loop") == FAILURE)
6250 if (gfc_resolve_iterator_expr (iter->step, real_ok,
6251 "Step expression in DO loop") == FAILURE)
6254 if (iter->step->expr_type == EXPR_CONSTANT)
6256 if ((iter->step->ts.type == BT_INTEGER
6257 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
6258 || (iter->step->ts.type == BT_REAL
6259 && mpfr_sgn (iter->step->value.real) == 0))
6261 gfc_error ("Step expression in DO loop at %L cannot be zero",
6262 &iter->step->where);
6267 /* Convert start, end, and step to the same type as var. */
6268 if (iter->start->ts.kind != iter->var->ts.kind
6269 || iter->start->ts.type != iter->var->ts.type)
6270 gfc_convert_type (iter->start, &iter->var->ts, 2);
6272 if (iter->end->ts.kind != iter->var->ts.kind
6273 || iter->end->ts.type != iter->var->ts.type)
6274 gfc_convert_type (iter->end, &iter->var->ts, 2);
6276 if (iter->step->ts.kind != iter->var->ts.kind
6277 || iter->step->ts.type != iter->var->ts.type)
6278 gfc_convert_type (iter->step, &iter->var->ts, 2);
6280 if (iter->start->expr_type == EXPR_CONSTANT
6281 && iter->end->expr_type == EXPR_CONSTANT
6282 && iter->step->expr_type == EXPR_CONSTANT)
6285 if (iter->start->ts.type == BT_INTEGER)
6287 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
6288 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
6292 sgn = mpfr_sgn (iter->step->value.real);
6293 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
6295 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
6296 gfc_warning ("DO loop at %L will be executed zero times",
6297 &iter->step->where);
6304 /* Traversal function for find_forall_index. f == 2 signals that
6305 that variable itself is not to be checked - only the references. */
6308 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6310 if (expr->expr_type != EXPR_VARIABLE)
6313 /* A scalar assignment */
6314 if (!expr->ref || *f == 1)
6316 if (expr->symtree->n.sym == sym)
6328 /* Check whether the FORALL index appears in the expression or not.
6329 Returns SUCCESS if SYM is found in EXPR. */
6332 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6334 if (gfc_traverse_expr (expr, sym, forall_index, f))
6341 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6342 to be a scalar INTEGER variable. The subscripts and stride are scalar
6343 INTEGERs, and if stride is a constant it must be nonzero.
6344 Furthermore "A subscript or stride in a forall-triplet-spec shall
6345 not contain a reference to any index-name in the
6346 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6349 resolve_forall_iterators (gfc_forall_iterator *it)
6351 gfc_forall_iterator *iter, *iter2;
6353 for (iter = it; iter; iter = iter->next)
6355 if (gfc_resolve_expr (iter->var) == SUCCESS
6356 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6357 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6360 if (gfc_resolve_expr (iter->start) == SUCCESS
6361 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6362 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6363 &iter->start->where);
6364 if (iter->var->ts.kind != iter->start->ts.kind)
6365 gfc_convert_type (iter->start, &iter->var->ts, 2);
6367 if (gfc_resolve_expr (iter->end) == SUCCESS
6368 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6369 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6371 if (iter->var->ts.kind != iter->end->ts.kind)
6372 gfc_convert_type (iter->end, &iter->var->ts, 2);
6374 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6376 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6377 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6378 &iter->stride->where, "INTEGER");
6380 if (iter->stride->expr_type == EXPR_CONSTANT
6381 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6382 gfc_error ("FORALL stride expression at %L cannot be zero",
6383 &iter->stride->where);
6385 if (iter->var->ts.kind != iter->stride->ts.kind)
6386 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6389 for (iter = it; iter; iter = iter->next)
6390 for (iter2 = iter; iter2; iter2 = iter2->next)
6392 if (find_forall_index (iter2->start,
6393 iter->var->symtree->n.sym, 0) == SUCCESS
6394 || find_forall_index (iter2->end,
6395 iter->var->symtree->n.sym, 0) == SUCCESS
6396 || find_forall_index (iter2->stride,
6397 iter->var->symtree->n.sym, 0) == SUCCESS)
6398 gfc_error ("FORALL index '%s' may not appear in triplet "
6399 "specification at %L", iter->var->symtree->name,
6400 &iter2->start->where);
6405 /* Given a pointer to a symbol that is a derived type, see if it's
6406 inaccessible, i.e. if it's defined in another module and the components are
6407 PRIVATE. The search is recursive if necessary. Returns zero if no
6408 inaccessible components are found, nonzero otherwise. */
6411 derived_inaccessible (gfc_symbol *sym)
6415 if (sym->attr.use_assoc && sym->attr.private_comp)
6418 for (c = sym->components; c; c = c->next)
6420 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6428 /* Resolve the argument of a deallocate expression. The expression must be
6429 a pointer or a full array. */
6432 resolve_deallocate_expr (gfc_expr *e)
6434 symbol_attribute attr;
6435 int allocatable, pointer;
6440 if (gfc_resolve_expr (e) == FAILURE)
6443 if (e->expr_type != EXPR_VARIABLE)
6446 sym = e->symtree->n.sym;
6448 if (sym->ts.type == BT_CLASS)
6450 allocatable = CLASS_DATA (sym)->attr.allocatable;
6451 pointer = CLASS_DATA (sym)->attr.class_pointer;
6455 allocatable = sym->attr.allocatable;
6456 pointer = sym->attr.pointer;
6458 for (ref = e->ref; ref; ref = ref->next)
6463 if (ref->u.ar.type != AR_FULL)
6468 c = ref->u.c.component;
6469 if (c->ts.type == BT_CLASS)
6471 allocatable = CLASS_DATA (c)->attr.allocatable;
6472 pointer = CLASS_DATA (c)->attr.class_pointer;
6476 allocatable = c->attr.allocatable;
6477 pointer = c->attr.pointer;
6487 attr = gfc_expr_attr (e);
6489 if (allocatable == 0 && attr.pointer == 0)
6492 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6498 if (gfc_is_coindexed (e))
6500 gfc_error ("Coindexed allocatable object at %L", &e->where);
6505 && gfc_check_vardef_context (e, true, _("DEALLOCATE object")) == FAILURE)
6507 if (gfc_check_vardef_context (e, false, _("DEALLOCATE object")) == FAILURE)
6514 /* Returns true if the expression e contains a reference to the symbol sym. */
6516 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6518 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6525 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6527 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6531 /* Given the expression node e for an allocatable/pointer of derived type to be
6532 allocated, get the expression node to be initialized afterwards (needed for
6533 derived types with default initializers, and derived types with allocatable
6534 components that need nullification.) */
6537 gfc_expr_to_initialize (gfc_expr *e)
6543 result = gfc_copy_expr (e);
6545 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6546 for (ref = result->ref; ref; ref = ref->next)
6547 if (ref->type == REF_ARRAY && ref->next == NULL)
6549 ref->u.ar.type = AR_FULL;
6551 for (i = 0; i < ref->u.ar.dimen; i++)
6552 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6554 result->rank = ref->u.ar.dimen;
6562 /* If the last ref of an expression is an array ref, return a copy of the
6563 expression with that one removed. Otherwise, a copy of the original
6564 expression. This is used for allocate-expressions and pointer assignment
6565 LHS, where there may be an array specification that needs to be stripped
6566 off when using gfc_check_vardef_context. */
6569 remove_last_array_ref (gfc_expr* e)
6574 e2 = gfc_copy_expr (e);
6575 for (r = &e2->ref; *r; r = &(*r)->next)
6576 if ((*r)->type == REF_ARRAY && !(*r)->next)
6578 gfc_free_ref_list (*r);
6587 /* Used in resolve_allocate_expr to check that a allocation-object and
6588 a source-expr are conformable. This does not catch all possible
6589 cases; in particular a runtime checking is needed. */
6592 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6595 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6597 /* First compare rank. */
6598 if (tail && e1->rank != tail->u.ar.as->rank)
6600 gfc_error ("Source-expr at %L must be scalar or have the "
6601 "same rank as the allocate-object at %L",
6602 &e1->where, &e2->where);
6613 for (i = 0; i < e1->rank; i++)
6615 if (tail->u.ar.end[i])
6617 mpz_set (s, tail->u.ar.end[i]->value.integer);
6618 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6619 mpz_add_ui (s, s, 1);
6623 mpz_set (s, tail->u.ar.start[i]->value.integer);
6626 if (mpz_cmp (e1->shape[i], s) != 0)
6628 gfc_error ("Source-expr at %L and allocate-object at %L must "
6629 "have the same shape", &e1->where, &e2->where);
6642 /* Resolve the expression in an ALLOCATE statement, doing the additional
6643 checks to see whether the expression is OK or not. The expression must
6644 have a trailing array reference that gives the size of the array. */
6647 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6649 int i, pointer, allocatable, dimension, is_abstract;
6652 symbol_attribute attr;
6653 gfc_ref *ref, *ref2;
6656 gfc_symbol *sym = NULL;
6661 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6662 checking of coarrays. */
6663 for (ref = e->ref; ref; ref = ref->next)
6664 if (ref->next == NULL)
6667 if (ref && ref->type == REF_ARRAY)
6668 ref->u.ar.in_allocate = true;
6670 if (gfc_resolve_expr (e) == FAILURE)
6673 /* Make sure the expression is allocatable or a pointer. If it is
6674 pointer, the next-to-last reference must be a pointer. */
6678 sym = e->symtree->n.sym;
6680 /* Check whether ultimate component is abstract and CLASS. */
6683 if (e->expr_type != EXPR_VARIABLE)
6686 attr = gfc_expr_attr (e);
6687 pointer = attr.pointer;
6688 dimension = attr.dimension;
6689 codimension = attr.codimension;
6693 if (sym->ts.type == BT_CLASS)
6695 allocatable = CLASS_DATA (sym)->attr.allocatable;
6696 pointer = CLASS_DATA (sym)->attr.class_pointer;
6697 dimension = CLASS_DATA (sym)->attr.dimension;
6698 codimension = CLASS_DATA (sym)->attr.codimension;
6699 is_abstract = CLASS_DATA (sym)->attr.abstract;
6703 allocatable = sym->attr.allocatable;
6704 pointer = sym->attr.pointer;
6705 dimension = sym->attr.dimension;
6706 codimension = sym->attr.codimension;
6711 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6716 if (ref->u.ar.codimen > 0)
6719 for (n = ref->u.ar.dimen;
6720 n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
6721 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
6728 if (ref->next != NULL)
6736 gfc_error ("Coindexed allocatable object at %L",
6741 c = ref->u.c.component;
6742 if (c->ts.type == BT_CLASS)
6744 allocatable = CLASS_DATA (c)->attr.allocatable;
6745 pointer = CLASS_DATA (c)->attr.class_pointer;
6746 dimension = CLASS_DATA (c)->attr.dimension;
6747 codimension = CLASS_DATA (c)->attr.codimension;
6748 is_abstract = CLASS_DATA (c)->attr.abstract;
6752 allocatable = c->attr.allocatable;
6753 pointer = c->attr.pointer;
6754 dimension = c->attr.dimension;
6755 codimension = c->attr.codimension;
6756 is_abstract = c->attr.abstract;
6768 if (allocatable == 0 && pointer == 0)
6770 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6775 /* Some checks for the SOURCE tag. */
6778 /* Check F03:C631. */
6779 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6781 gfc_error ("Type of entity at %L is type incompatible with "
6782 "source-expr at %L", &e->where, &code->expr3->where);
6786 /* Check F03:C632 and restriction following Note 6.18. */
6787 if (code->expr3->rank > 0
6788 && conformable_arrays (code->expr3, e) == FAILURE)
6791 /* Check F03:C633. */
6792 if (code->expr3->ts.kind != e->ts.kind)
6794 gfc_error ("The allocate-object at %L and the source-expr at %L "
6795 "shall have the same kind type parameter",
6796 &e->where, &code->expr3->where);
6801 /* Check F08:C629. */
6802 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6805 gcc_assert (e->ts.type == BT_CLASS);
6806 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6807 "type-spec or source-expr", sym->name, &e->where);
6811 /* In the variable definition context checks, gfc_expr_attr is used
6812 on the expression. This is fooled by the array specification
6813 present in e, thus we have to eliminate that one temporarily. */
6814 e2 = remove_last_array_ref (e);
6816 if (t == SUCCESS && pointer)
6817 t = gfc_check_vardef_context (e2, true, _("ALLOCATE object"));
6819 t = gfc_check_vardef_context (e2, false, _("ALLOCATE object"));
6826 /* Set up default initializer if needed. */
6830 if (code->ext.alloc.ts.type == BT_DERIVED)
6831 ts = code->ext.alloc.ts;
6835 if (ts.type == BT_CLASS)
6836 ts = ts.u.derived->components->ts;
6838 if (ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&ts)))
6840 gfc_code *init_st = gfc_get_code ();
6841 init_st->loc = code->loc;
6842 init_st->op = EXEC_INIT_ASSIGN;
6843 init_st->expr1 = gfc_expr_to_initialize (e);
6844 init_st->expr2 = init_e;
6845 init_st->next = code->next;
6846 code->next = init_st;
6849 else if (code->expr3->mold && code->expr3->ts.type == BT_DERIVED)
6851 /* Default initialization via MOLD (non-polymorphic). */
6852 gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
6853 gfc_resolve_expr (rhs);
6854 gfc_free_expr (code->expr3);
6858 if (e->ts.type == BT_CLASS)
6860 /* Make sure the vtab symbol is present when
6861 the module variables are generated. */
6862 gfc_typespec ts = e->ts;
6864 ts = code->expr3->ts;
6865 else if (code->ext.alloc.ts.type == BT_DERIVED)
6866 ts = code->ext.alloc.ts;
6867 gfc_find_derived_vtab (ts.u.derived);
6870 if (pointer || (dimension == 0 && codimension == 0))
6873 /* Make sure the last reference node is an array specifiction. */
6875 if (!ref2 || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6876 || (dimension && ref2->u.ar.dimen == 0))
6878 gfc_error ("Array specification required in ALLOCATE statement "
6879 "at %L", &e->where);
6883 /* Make sure that the array section reference makes sense in the
6884 context of an ALLOCATE specification. */
6889 for (i = ar->dimen; i < ar->dimen + ar->codimen; i++)
6890 if (ar->dimen_type[i] == DIMEN_THIS_IMAGE)
6892 gfc_error ("Coarray specification required in ALLOCATE statement "
6893 "at %L", &e->where);
6897 for (i = 0; i < ar->dimen; i++)
6899 if (ref2->u.ar.type == AR_ELEMENT)
6902 switch (ar->dimen_type[i])
6908 if (ar->start[i] != NULL
6909 && ar->end[i] != NULL
6910 && ar->stride[i] == NULL)
6913 /* Fall Through... */
6918 case DIMEN_THIS_IMAGE:
6919 gfc_error ("Bad array specification in ALLOCATE statement at %L",
6925 for (a = code->ext.alloc.list; a; a = a->next)
6927 sym = a->expr->symtree->n.sym;
6929 /* TODO - check derived type components. */
6930 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
6933 if ((ar->start[i] != NULL
6934 && gfc_find_sym_in_expr (sym, ar->start[i]))
6935 || (ar->end[i] != NULL
6936 && gfc_find_sym_in_expr (sym, ar->end[i])))
6938 gfc_error ("'%s' must not appear in the array specification at "
6939 "%L in the same ALLOCATE statement where it is "
6940 "itself allocated", sym->name, &ar->where);
6946 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
6948 if (ar->dimen_type[i] == DIMEN_ELEMENT
6949 || ar->dimen_type[i] == DIMEN_RANGE)
6951 if (i == (ar->dimen + ar->codimen - 1))
6953 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
6954 "statement at %L", &e->where);
6960 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
6961 && ar->stride[i] == NULL)
6964 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
6969 if (codimension && ar->as->rank == 0)
6971 gfc_error ("Sorry, allocatable scalar coarrays are not yet supported "
6972 "at %L", &e->where);
6984 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
6986 gfc_expr *stat, *errmsg, *pe, *qe;
6987 gfc_alloc *a, *p, *q;
6990 errmsg = code->expr2;
6992 /* Check the stat variable. */
6995 gfc_check_vardef_context (stat, false, _("STAT variable"));
6997 if ((stat->ts.type != BT_INTEGER
6998 && !(stat->ref && (stat->ref->type == REF_ARRAY
6999 || stat->ref->type == REF_COMPONENT)))
7001 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
7002 "variable", &stat->where);
7004 for (p = code->ext.alloc.list; p; p = p->next)
7005 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
7007 gfc_ref *ref1, *ref2;
7010 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
7011 ref1 = ref1->next, ref2 = ref2->next)
7013 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7015 if (ref1->u.c.component->name != ref2->u.c.component->name)
7024 gfc_error ("Stat-variable at %L shall not be %sd within "
7025 "the same %s statement", &stat->where, fcn, fcn);
7031 /* Check the errmsg variable. */
7035 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
7038 gfc_check_vardef_context (errmsg, false, _("ERRMSG variable"));
7040 if ((errmsg->ts.type != BT_CHARACTER
7042 && (errmsg->ref->type == REF_ARRAY
7043 || errmsg->ref->type == REF_COMPONENT)))
7044 || errmsg->rank > 0 )
7045 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
7046 "variable", &errmsg->where);
7048 for (p = code->ext.alloc.list; p; p = p->next)
7049 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
7051 gfc_ref *ref1, *ref2;
7054 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
7055 ref1 = ref1->next, ref2 = ref2->next)
7057 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7059 if (ref1->u.c.component->name != ref2->u.c.component->name)
7068 gfc_error ("Errmsg-variable at %L shall not be %sd within "
7069 "the same %s statement", &errmsg->where, fcn, fcn);
7075 /* Check that an allocate-object appears only once in the statement.
7076 FIXME: Checking derived types is disabled. */
7077 for (p = code->ext.alloc.list; p; p = p->next)
7080 for (q = p->next; q; q = q->next)
7083 if (pe->symtree->n.sym->name == qe->symtree->n.sym->name)
7085 /* This is a potential collision. */
7086 gfc_ref *pr = pe->ref;
7087 gfc_ref *qr = qe->ref;
7089 /* Follow the references until
7090 a) They start to differ, in which case there is no error;
7091 you can deallocate a%b and a%c in a single statement
7092 b) Both of them stop, which is an error
7093 c) One of them stops, which is also an error. */
7096 if (pr == NULL && qr == NULL)
7098 gfc_error ("Allocate-object at %L also appears at %L",
7099 &pe->where, &qe->where);
7102 else if (pr != NULL && qr == NULL)
7104 gfc_error ("Allocate-object at %L is subobject of"
7105 " object at %L", &pe->where, &qe->where);
7108 else if (pr == NULL && qr != NULL)
7110 gfc_error ("Allocate-object at %L is subobject of"
7111 " object at %L", &qe->where, &pe->where);
7114 /* Here, pr != NULL && qr != NULL */
7115 gcc_assert(pr->type == qr->type);
7116 if (pr->type == REF_ARRAY)
7118 /* Handle cases like allocate(v(3)%x(3), v(2)%x(3)),
7120 gcc_assert (qr->type == REF_ARRAY);
7122 if (pr->next && qr->next)
7124 gfc_array_ref *par = &(pr->u.ar);
7125 gfc_array_ref *qar = &(qr->u.ar);
7126 if (gfc_dep_compare_expr (par->start[0],
7127 qar->start[0]) != 0)
7133 if (pr->u.c.component->name != qr->u.c.component->name)
7144 if (strcmp (fcn, "ALLOCATE") == 0)
7146 for (a = code->ext.alloc.list; a; a = a->next)
7147 resolve_allocate_expr (a->expr, code);
7151 for (a = code->ext.alloc.list; a; a = a->next)
7152 resolve_deallocate_expr (a->expr);
7157 /************ SELECT CASE resolution subroutines ************/
7159 /* Callback function for our mergesort variant. Determines interval
7160 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
7161 op1 > op2. Assumes we're not dealing with the default case.
7162 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
7163 There are nine situations to check. */
7166 compare_cases (const gfc_case *op1, const gfc_case *op2)
7170 if (op1->low == NULL) /* op1 = (:L) */
7172 /* op2 = (:N), so overlap. */
7174 /* op2 = (M:) or (M:N), L < M */
7175 if (op2->low != NULL
7176 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7179 else if (op1->high == NULL) /* op1 = (K:) */
7181 /* op2 = (M:), so overlap. */
7183 /* op2 = (:N) or (M:N), K > N */
7184 if (op2->high != NULL
7185 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7188 else /* op1 = (K:L) */
7190 if (op2->low == NULL) /* op2 = (:N), K > N */
7191 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7193 else if (op2->high == NULL) /* op2 = (M:), L < M */
7194 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7196 else /* op2 = (M:N) */
7200 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7203 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7212 /* Merge-sort a double linked case list, detecting overlap in the
7213 process. LIST is the head of the double linked case list before it
7214 is sorted. Returns the head of the sorted list if we don't see any
7215 overlap, or NULL otherwise. */
7218 check_case_overlap (gfc_case *list)
7220 gfc_case *p, *q, *e, *tail;
7221 int insize, nmerges, psize, qsize, cmp, overlap_seen;
7223 /* If the passed list was empty, return immediately. */
7230 /* Loop unconditionally. The only exit from this loop is a return
7231 statement, when we've finished sorting the case list. */
7238 /* Count the number of merges we do in this pass. */
7241 /* Loop while there exists a merge to be done. */
7246 /* Count this merge. */
7249 /* Cut the list in two pieces by stepping INSIZE places
7250 forward in the list, starting from P. */
7253 for (i = 0; i < insize; i++)
7262 /* Now we have two lists. Merge them! */
7263 while (psize > 0 || (qsize > 0 && q != NULL))
7265 /* See from which the next case to merge comes from. */
7268 /* P is empty so the next case must come from Q. */
7273 else if (qsize == 0 || q == NULL)
7282 cmp = compare_cases (p, q);
7285 /* The whole case range for P is less than the
7293 /* The whole case range for Q is greater than
7294 the case range for P. */
7301 /* The cases overlap, or they are the same
7302 element in the list. Either way, we must
7303 issue an error and get the next case from P. */
7304 /* FIXME: Sort P and Q by line number. */
7305 gfc_error ("CASE label at %L overlaps with CASE "
7306 "label at %L", &p->where, &q->where);
7314 /* Add the next element to the merged list. */
7323 /* P has now stepped INSIZE places along, and so has Q. So
7324 they're the same. */
7329 /* If we have done only one merge or none at all, we've
7330 finished sorting the cases. */
7339 /* Otherwise repeat, merging lists twice the size. */
7345 /* Check to see if an expression is suitable for use in a CASE statement.
7346 Makes sure that all case expressions are scalar constants of the same
7347 type. Return FAILURE if anything is wrong. */
7350 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
7352 if (e == NULL) return SUCCESS;
7354 if (e->ts.type != case_expr->ts.type)
7356 gfc_error ("Expression in CASE statement at %L must be of type %s",
7357 &e->where, gfc_basic_typename (case_expr->ts.type));
7361 /* C805 (R808) For a given case-construct, each case-value shall be of
7362 the same type as case-expr. For character type, length differences
7363 are allowed, but the kind type parameters shall be the same. */
7365 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
7367 gfc_error ("Expression in CASE statement at %L must be of kind %d",
7368 &e->where, case_expr->ts.kind);
7372 /* Convert the case value kind to that of case expression kind,
7375 if (e->ts.kind != case_expr->ts.kind)
7376 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
7380 gfc_error ("Expression in CASE statement at %L must be scalar",
7389 /* Given a completely parsed select statement, we:
7391 - Validate all expressions and code within the SELECT.
7392 - Make sure that the selection expression is not of the wrong type.
7393 - Make sure that no case ranges overlap.
7394 - Eliminate unreachable cases and unreachable code resulting from
7395 removing case labels.
7397 The standard does allow unreachable cases, e.g. CASE (5:3). But
7398 they are a hassle for code generation, and to prevent that, we just
7399 cut them out here. This is not necessary for overlapping cases
7400 because they are illegal and we never even try to generate code.
7402 We have the additional caveat that a SELECT construct could have
7403 been a computed GOTO in the source code. Fortunately we can fairly
7404 easily work around that here: The case_expr for a "real" SELECT CASE
7405 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7406 we have to do is make sure that the case_expr is a scalar integer
7410 resolve_select (gfc_code *code)
7413 gfc_expr *case_expr;
7414 gfc_case *cp, *default_case, *tail, *head;
7415 int seen_unreachable;
7421 if (code->expr1 == NULL)
7423 /* This was actually a computed GOTO statement. */
7424 case_expr = code->expr2;
7425 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7426 gfc_error ("Selection expression in computed GOTO statement "
7427 "at %L must be a scalar integer expression",
7430 /* Further checking is not necessary because this SELECT was built
7431 by the compiler, so it should always be OK. Just move the
7432 case_expr from expr2 to expr so that we can handle computed
7433 GOTOs as normal SELECTs from here on. */
7434 code->expr1 = code->expr2;
7439 case_expr = code->expr1;
7441 type = case_expr->ts.type;
7442 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7444 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7445 &case_expr->where, gfc_typename (&case_expr->ts));
7447 /* Punt. Going on here just produce more garbage error messages. */
7451 if (case_expr->rank != 0)
7453 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7454 "expression", &case_expr->where);
7461 /* Raise a warning if an INTEGER case value exceeds the range of
7462 the case-expr. Later, all expressions will be promoted to the
7463 largest kind of all case-labels. */
7465 if (type == BT_INTEGER)
7466 for (body = code->block; body; body = body->block)
7467 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7470 && gfc_check_integer_range (cp->low->value.integer,
7471 case_expr->ts.kind) != ARITH_OK)
7472 gfc_warning ("Expression in CASE statement at %L is "
7473 "not in the range of %s", &cp->low->where,
7474 gfc_typename (&case_expr->ts));
7477 && cp->low != cp->high
7478 && gfc_check_integer_range (cp->high->value.integer,
7479 case_expr->ts.kind) != ARITH_OK)
7480 gfc_warning ("Expression in CASE statement at %L is "
7481 "not in the range of %s", &cp->high->where,
7482 gfc_typename (&case_expr->ts));
7485 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7486 of the SELECT CASE expression and its CASE values. Walk the lists
7487 of case values, and if we find a mismatch, promote case_expr to
7488 the appropriate kind. */
7490 if (type == BT_LOGICAL || type == BT_INTEGER)
7492 for (body = code->block; body; body = body->block)
7494 /* Walk the case label list. */
7495 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7497 /* Intercept the DEFAULT case. It does not have a kind. */
7498 if (cp->low == NULL && cp->high == NULL)
7501 /* Unreachable case ranges are discarded, so ignore. */
7502 if (cp->low != NULL && cp->high != NULL
7503 && cp->low != cp->high
7504 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7508 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7509 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7511 if (cp->high != NULL
7512 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7513 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7518 /* Assume there is no DEFAULT case. */
7519 default_case = NULL;
7524 for (body = code->block; body; body = body->block)
7526 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7528 seen_unreachable = 0;
7530 /* Walk the case label list, making sure that all case labels
7532 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7534 /* Count the number of cases in the whole construct. */
7537 /* Intercept the DEFAULT case. */
7538 if (cp->low == NULL && cp->high == NULL)
7540 if (default_case != NULL)
7542 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7543 "by a second DEFAULT CASE at %L",
7544 &default_case->where, &cp->where);
7555 /* Deal with single value cases and case ranges. Errors are
7556 issued from the validation function. */
7557 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7558 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7564 if (type == BT_LOGICAL
7565 && ((cp->low == NULL || cp->high == NULL)
7566 || cp->low != cp->high))
7568 gfc_error ("Logical range in CASE statement at %L is not "
7569 "allowed", &cp->low->where);
7574 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7577 value = cp->low->value.logical == 0 ? 2 : 1;
7578 if (value & seen_logical)
7580 gfc_error ("Constant logical value in CASE statement "
7581 "is repeated at %L",
7586 seen_logical |= value;
7589 if (cp->low != NULL && cp->high != NULL
7590 && cp->low != cp->high
7591 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7593 if (gfc_option.warn_surprising)
7594 gfc_warning ("Range specification at %L can never "
7595 "be matched", &cp->where);
7597 cp->unreachable = 1;
7598 seen_unreachable = 1;
7602 /* If the case range can be matched, it can also overlap with
7603 other cases. To make sure it does not, we put it in a
7604 double linked list here. We sort that with a merge sort
7605 later on to detect any overlapping cases. */
7609 head->right = head->left = NULL;
7614 tail->right->left = tail;
7621 /* It there was a failure in the previous case label, give up
7622 for this case label list. Continue with the next block. */
7626 /* See if any case labels that are unreachable have been seen.
7627 If so, we eliminate them. This is a bit of a kludge because
7628 the case lists for a single case statement (label) is a
7629 single forward linked lists. */
7630 if (seen_unreachable)
7632 /* Advance until the first case in the list is reachable. */
7633 while (body->ext.block.case_list != NULL
7634 && body->ext.block.case_list->unreachable)
7636 gfc_case *n = body->ext.block.case_list;
7637 body->ext.block.case_list = body->ext.block.case_list->next;
7639 gfc_free_case_list (n);
7642 /* Strip all other unreachable cases. */
7643 if (body->ext.block.case_list)
7645 for (cp = body->ext.block.case_list; cp->next; cp = cp->next)
7647 if (cp->next->unreachable)
7649 gfc_case *n = cp->next;
7650 cp->next = cp->next->next;
7652 gfc_free_case_list (n);
7659 /* See if there were overlapping cases. If the check returns NULL,
7660 there was overlap. In that case we don't do anything. If head
7661 is non-NULL, we prepend the DEFAULT case. The sorted list can
7662 then used during code generation for SELECT CASE constructs with
7663 a case expression of a CHARACTER type. */
7666 head = check_case_overlap (head);
7668 /* Prepend the default_case if it is there. */
7669 if (head != NULL && default_case)
7671 default_case->left = NULL;
7672 default_case->right = head;
7673 head->left = default_case;
7677 /* Eliminate dead blocks that may be the result if we've seen
7678 unreachable case labels for a block. */
7679 for (body = code; body && body->block; body = body->block)
7681 if (body->block->ext.block.case_list == NULL)
7683 /* Cut the unreachable block from the code chain. */
7684 gfc_code *c = body->block;
7685 body->block = c->block;
7687 /* Kill the dead block, but not the blocks below it. */
7689 gfc_free_statements (c);
7693 /* More than two cases is legal but insane for logical selects.
7694 Issue a warning for it. */
7695 if (gfc_option.warn_surprising && type == BT_LOGICAL
7697 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7702 /* Check if a derived type is extensible. */
7705 gfc_type_is_extensible (gfc_symbol *sym)
7707 return !(sym->attr.is_bind_c || sym->attr.sequence);
7711 /* Resolve an associate name: Resolve target and ensure the type-spec is
7712 correct as well as possibly the array-spec. */
7715 resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
7719 gcc_assert (sym->assoc);
7720 gcc_assert (sym->attr.flavor == FL_VARIABLE);
7722 /* If this is for SELECT TYPE, the target may not yet be set. In that
7723 case, return. Resolution will be called later manually again when
7725 target = sym->assoc->target;
7728 gcc_assert (!sym->assoc->dangling);
7730 if (resolve_target && gfc_resolve_expr (target) != SUCCESS)
7733 /* For variable targets, we get some attributes from the target. */
7734 if (target->expr_type == EXPR_VARIABLE)
7738 gcc_assert (target->symtree);
7739 tsym = target->symtree->n.sym;
7741 sym->attr.asynchronous = tsym->attr.asynchronous;
7742 sym->attr.volatile_ = tsym->attr.volatile_;
7744 sym->attr.target = (tsym->attr.target || tsym->attr.pointer);
7747 /* Get type if this was not already set. Note that it can be
7748 some other type than the target in case this is a SELECT TYPE
7749 selector! So we must not update when the type is already there. */
7750 if (sym->ts.type == BT_UNKNOWN)
7751 sym->ts = target->ts;
7752 gcc_assert (sym->ts.type != BT_UNKNOWN);
7754 /* See if this is a valid association-to-variable. */
7755 sym->assoc->variable = (target->expr_type == EXPR_VARIABLE
7756 && !gfc_has_vector_subscript (target));
7758 /* Finally resolve if this is an array or not. */
7759 if (sym->attr.dimension && target->rank == 0)
7761 gfc_error ("Associate-name '%s' at %L is used as array",
7762 sym->name, &sym->declared_at);
7763 sym->attr.dimension = 0;
7766 if (target->rank > 0)
7767 sym->attr.dimension = 1;
7769 if (sym->attr.dimension)
7771 sym->as = gfc_get_array_spec ();
7772 sym->as->rank = target->rank;
7773 sym->as->type = AS_DEFERRED;
7775 /* Target must not be coindexed, thus the associate-variable
7777 sym->as->corank = 0;
7782 /* Resolve a SELECT TYPE statement. */
7785 resolve_select_type (gfc_code *code, gfc_namespace *old_ns)
7787 gfc_symbol *selector_type;
7788 gfc_code *body, *new_st, *if_st, *tail;
7789 gfc_code *class_is = NULL, *default_case = NULL;
7792 char name[GFC_MAX_SYMBOL_LEN];
7796 ns = code->ext.block.ns;
7799 /* Check for F03:C813. */
7800 if (code->expr1->ts.type != BT_CLASS
7801 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7803 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7804 "at %L", &code->loc);
7810 if (code->expr1->symtree->n.sym->attr.untyped)
7811 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7812 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7815 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7817 /* Loop over TYPE IS / CLASS IS cases. */
7818 for (body = code->block; body; body = body->block)
7820 c = body->ext.block.case_list;
7822 /* Check F03:C815. */
7823 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7824 && !gfc_type_is_extensible (c->ts.u.derived))
7826 gfc_error ("Derived type '%s' at %L must be extensible",
7827 c->ts.u.derived->name, &c->where);
7832 /* Check F03:C816. */
7833 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7834 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7836 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7837 c->ts.u.derived->name, &c->where, selector_type->name);
7842 /* Intercept the DEFAULT case. */
7843 if (c->ts.type == BT_UNKNOWN)
7845 /* Check F03:C818. */
7848 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7849 "by a second DEFAULT CASE at %L",
7850 &default_case->ext.block.case_list->where, &c->where);
7855 default_case = body;
7862 /* Transform SELECT TYPE statement to BLOCK and associate selector to
7863 target if present. If there are any EXIT statements referring to the
7864 SELECT TYPE construct, this is no problem because the gfc_code
7865 reference stays the same and EXIT is equally possible from the BLOCK
7866 it is changed to. */
7867 code->op = EXEC_BLOCK;
7870 gfc_association_list* assoc;
7872 assoc = gfc_get_association_list ();
7873 assoc->st = code->expr1->symtree;
7874 assoc->target = gfc_copy_expr (code->expr2);
7875 /* assoc->variable will be set by resolve_assoc_var. */
7877 code->ext.block.assoc = assoc;
7878 code->expr1->symtree->n.sym->assoc = assoc;
7880 resolve_assoc_var (code->expr1->symtree->n.sym, false);
7883 code->ext.block.assoc = NULL;
7885 /* Add EXEC_SELECT to switch on type. */
7886 new_st = gfc_get_code ();
7887 new_st->op = code->op;
7888 new_st->expr1 = code->expr1;
7889 new_st->expr2 = code->expr2;
7890 new_st->block = code->block;
7891 code->expr1 = code->expr2 = NULL;
7896 ns->code->next = new_st;
7898 code->op = EXEC_SELECT;
7899 gfc_add_vptr_component (code->expr1);
7900 gfc_add_hash_component (code->expr1);
7902 /* Loop over TYPE IS / CLASS IS cases. */
7903 for (body = code->block; body; body = body->block)
7905 c = body->ext.block.case_list;
7907 if (c->ts.type == BT_DERIVED)
7908 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7909 c->ts.u.derived->hash_value);
7911 else if (c->ts.type == BT_UNKNOWN)
7914 /* Associate temporary to selector. This should only be done
7915 when this case is actually true, so build a new ASSOCIATE
7916 that does precisely this here (instead of using the
7919 if (c->ts.type == BT_CLASS)
7920 sprintf (name, "__tmp_class_%s", c->ts.u.derived->name);
7922 sprintf (name, "__tmp_type_%s", c->ts.u.derived->name);
7923 st = gfc_find_symtree (ns->sym_root, name);
7924 gcc_assert (st->n.sym->assoc);
7925 st->n.sym->assoc->target = gfc_get_variable_expr (code->expr1->symtree);
7926 if (c->ts.type == BT_DERIVED)
7927 gfc_add_data_component (st->n.sym->assoc->target);
7929 new_st = gfc_get_code ();
7930 new_st->op = EXEC_BLOCK;
7931 new_st->ext.block.ns = gfc_build_block_ns (ns);
7932 new_st->ext.block.ns->code = body->next;
7933 body->next = new_st;
7935 /* Chain in the new list only if it is marked as dangling. Otherwise
7936 there is a CASE label overlap and this is already used. Just ignore,
7937 the error is diagonsed elsewhere. */
7938 if (st->n.sym->assoc->dangling)
7940 new_st->ext.block.assoc = st->n.sym->assoc;
7941 st->n.sym->assoc->dangling = 0;
7944 resolve_assoc_var (st->n.sym, false);
7947 /* Take out CLASS IS cases for separate treatment. */
7949 while (body && body->block)
7951 if (body->block->ext.block.case_list->ts.type == BT_CLASS)
7953 /* Add to class_is list. */
7954 if (class_is == NULL)
7956 class_is = body->block;
7961 for (tail = class_is; tail->block; tail = tail->block) ;
7962 tail->block = body->block;
7965 /* Remove from EXEC_SELECT list. */
7966 body->block = body->block->block;
7979 /* Add a default case to hold the CLASS IS cases. */
7980 for (tail = code; tail->block; tail = tail->block) ;
7981 tail->block = gfc_get_code ();
7983 tail->op = EXEC_SELECT_TYPE;
7984 tail->ext.block.case_list = gfc_get_case ();
7985 tail->ext.block.case_list->ts.type = BT_UNKNOWN;
7987 default_case = tail;
7990 /* More than one CLASS IS block? */
7991 if (class_is->block)
7995 /* Sort CLASS IS blocks by extension level. */
7999 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
8002 /* F03:C817 (check for doubles). */
8003 if ((*c1)->ext.block.case_list->ts.u.derived->hash_value
8004 == c2->ext.block.case_list->ts.u.derived->hash_value)
8006 gfc_error ("Double CLASS IS block in SELECT TYPE "
8008 &c2->ext.block.case_list->where);
8011 if ((*c1)->ext.block.case_list->ts.u.derived->attr.extension
8012 < c2->ext.block.case_list->ts.u.derived->attr.extension)
8015 (*c1)->block = c2->block;
8025 /* Generate IF chain. */
8026 if_st = gfc_get_code ();
8027 if_st->op = EXEC_IF;
8029 for (body = class_is; body; body = body->block)
8031 new_st->block = gfc_get_code ();
8032 new_st = new_st->block;
8033 new_st->op = EXEC_IF;
8034 /* Set up IF condition: Call _gfortran_is_extension_of. */
8035 new_st->expr1 = gfc_get_expr ();
8036 new_st->expr1->expr_type = EXPR_FUNCTION;
8037 new_st->expr1->ts.type = BT_LOGICAL;
8038 new_st->expr1->ts.kind = 4;
8039 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
8040 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
8041 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
8042 /* Set up arguments. */
8043 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
8044 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
8045 new_st->expr1->value.function.actual->expr->where = code->loc;
8046 gfc_add_vptr_component (new_st->expr1->value.function.actual->expr);
8047 vtab = gfc_find_derived_vtab (body->ext.block.case_list->ts.u.derived);
8048 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
8049 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
8050 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
8051 new_st->next = body->next;
8053 if (default_case->next)
8055 new_st->block = gfc_get_code ();
8056 new_st = new_st->block;
8057 new_st->op = EXEC_IF;
8058 new_st->next = default_case->next;
8061 /* Replace CLASS DEFAULT code by the IF chain. */
8062 default_case->next = if_st;
8065 /* Resolve the internal code. This can not be done earlier because
8066 it requires that the sym->assoc of selectors is set already. */
8067 gfc_current_ns = ns;
8068 gfc_resolve_blocks (code->block, gfc_current_ns);
8069 gfc_current_ns = old_ns;
8071 resolve_select (code);
8075 /* Resolve a transfer statement. This is making sure that:
8076 -- a derived type being transferred has only non-pointer components
8077 -- a derived type being transferred doesn't have private components, unless
8078 it's being transferred from the module where the type was defined
8079 -- we're not trying to transfer a whole assumed size array. */
8082 resolve_transfer (gfc_code *code)
8091 while (exp != NULL && exp->expr_type == EXPR_OP
8092 && exp->value.op.op == INTRINSIC_PARENTHESES)
8093 exp = exp->value.op.op1;
8095 if (exp == NULL || (exp->expr_type != EXPR_VARIABLE
8096 && exp->expr_type != EXPR_FUNCTION))
8099 /* If we are reading, the variable will be changed. Note that
8100 code->ext.dt may be NULL if the TRANSFER is related to
8101 an INQUIRE statement -- but in this case, we are not reading, either. */
8102 if (code->ext.dt && code->ext.dt->dt_io_kind->value.iokind == M_READ
8103 && gfc_check_vardef_context (exp, false, _("item in READ")) == FAILURE)
8106 sym = exp->symtree->n.sym;
8109 /* Go to actual component transferred. */
8110 for (ref = exp->ref; ref; ref = ref->next)
8111 if (ref->type == REF_COMPONENT)
8112 ts = &ref->u.c.component->ts;
8114 if (ts->type == BT_CLASS)
8116 /* FIXME: Test for defined input/output. */
8117 gfc_error ("Data transfer element at %L cannot be polymorphic unless "
8118 "it is processed by a defined input/output procedure",
8123 if (ts->type == BT_DERIVED)
8125 /* Check that transferred derived type doesn't contain POINTER
8127 if (ts->u.derived->attr.pointer_comp)
8129 gfc_error ("Data transfer element at %L cannot have "
8130 "POINTER components", &code->loc);
8135 if (ts->u.derived->attr.proc_pointer_comp)
8137 gfc_error ("Data transfer element at %L cannot have "
8138 "procedure pointer components", &code->loc);
8142 if (ts->u.derived->attr.alloc_comp)
8144 gfc_error ("Data transfer element at %L cannot have "
8145 "ALLOCATABLE components", &code->loc);
8149 if (derived_inaccessible (ts->u.derived))
8151 gfc_error ("Data transfer element at %L cannot have "
8152 "PRIVATE components",&code->loc);
8157 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE
8158 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
8160 gfc_error ("Data transfer element at %L cannot be a full reference to "
8161 "an assumed-size array", &code->loc);
8167 /*********** Toplevel code resolution subroutines ***********/
8169 /* Find the set of labels that are reachable from this block. We also
8170 record the last statement in each block. */
8173 find_reachable_labels (gfc_code *block)
8180 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
8182 /* Collect labels in this block. We don't keep those corresponding
8183 to END {IF|SELECT}, these are checked in resolve_branch by going
8184 up through the code_stack. */
8185 for (c = block; c; c = c->next)
8187 if (c->here && c->op != EXEC_END_BLOCK)
8188 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
8191 /* Merge with labels from parent block. */
8194 gcc_assert (cs_base->prev->reachable_labels);
8195 bitmap_ior_into (cs_base->reachable_labels,
8196 cs_base->prev->reachable_labels);
8202 resolve_sync (gfc_code *code)
8204 /* Check imageset. The * case matches expr1 == NULL. */
8207 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
8208 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
8209 "INTEGER expression", &code->expr1->where);
8210 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
8211 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
8212 gfc_error ("Imageset argument at %L must between 1 and num_images()",
8213 &code->expr1->where);
8214 else if (code->expr1->expr_type == EXPR_ARRAY
8215 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
8217 gfc_constructor *cons;
8218 cons = gfc_constructor_first (code->expr1->value.constructor);
8219 for (; cons; cons = gfc_constructor_next (cons))
8220 if (cons->expr->expr_type == EXPR_CONSTANT
8221 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
8222 gfc_error ("Imageset argument at %L must between 1 and "
8223 "num_images()", &cons->expr->where);
8229 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8230 || code->expr2->expr_type != EXPR_VARIABLE))
8231 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8232 &code->expr2->where);
8236 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8237 || code->expr3->expr_type != EXPR_VARIABLE))
8238 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8239 &code->expr3->where);
8243 /* Given a branch to a label, see if the branch is conforming.
8244 The code node describes where the branch is located. */
8247 resolve_branch (gfc_st_label *label, gfc_code *code)
8254 /* Step one: is this a valid branching target? */
8256 if (label->defined == ST_LABEL_UNKNOWN)
8258 gfc_error ("Label %d referenced at %L is never defined", label->value,
8263 if (label->defined != ST_LABEL_TARGET)
8265 gfc_error ("Statement at %L is not a valid branch target statement "
8266 "for the branch statement at %L", &label->where, &code->loc);
8270 /* Step two: make sure this branch is not a branch to itself ;-) */
8272 if (code->here == label)
8274 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
8278 /* Step three: See if the label is in the same block as the
8279 branching statement. The hard work has been done by setting up
8280 the bitmap reachable_labels. */
8282 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
8284 /* Check now whether there is a CRITICAL construct; if so, check
8285 whether the label is still visible outside of the CRITICAL block,
8286 which is invalid. */
8287 for (stack = cs_base; stack; stack = stack->prev)
8288 if (stack->current->op == EXEC_CRITICAL
8289 && bitmap_bit_p (stack->reachable_labels, label->value))
8290 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8291 " at %L", &code->loc, &label->where);
8296 /* Step four: If we haven't found the label in the bitmap, it may
8297 still be the label of the END of the enclosing block, in which
8298 case we find it by going up the code_stack. */
8300 for (stack = cs_base; stack; stack = stack->prev)
8302 if (stack->current->next && stack->current->next->here == label)
8304 if (stack->current->op == EXEC_CRITICAL)
8306 /* Note: A label at END CRITICAL does not leave the CRITICAL
8307 construct as END CRITICAL is still part of it. */
8308 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8309 " at %L", &code->loc, &label->where);
8316 gcc_assert (stack->current->next->op == EXEC_END_BLOCK);
8320 /* The label is not in an enclosing block, so illegal. This was
8321 allowed in Fortran 66, so we allow it as extension. No
8322 further checks are necessary in this case. */
8323 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
8324 "as the GOTO statement at %L", &label->where,
8330 /* Check whether EXPR1 has the same shape as EXPR2. */
8333 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
8335 mpz_t shape[GFC_MAX_DIMENSIONS];
8336 mpz_t shape2[GFC_MAX_DIMENSIONS];
8337 gfc_try result = FAILURE;
8340 /* Compare the rank. */
8341 if (expr1->rank != expr2->rank)
8344 /* Compare the size of each dimension. */
8345 for (i=0; i<expr1->rank; i++)
8347 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
8350 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
8353 if (mpz_cmp (shape[i], shape2[i]))
8357 /* When either of the two expression is an assumed size array, we
8358 ignore the comparison of dimension sizes. */
8363 for (i--; i >= 0; i--)
8365 mpz_clear (shape[i]);
8366 mpz_clear (shape2[i]);
8372 /* Check whether a WHERE assignment target or a WHERE mask expression
8373 has the same shape as the outmost WHERE mask expression. */
8376 resolve_where (gfc_code *code, gfc_expr *mask)
8382 cblock = code->block;
8384 /* Store the first WHERE mask-expr of the WHERE statement or construct.
8385 In case of nested WHERE, only the outmost one is stored. */
8386 if (mask == NULL) /* outmost WHERE */
8388 else /* inner WHERE */
8395 /* Check if the mask-expr has a consistent shape with the
8396 outmost WHERE mask-expr. */
8397 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
8398 gfc_error ("WHERE mask at %L has inconsistent shape",
8399 &cblock->expr1->where);
8402 /* the assignment statement of a WHERE statement, or the first
8403 statement in where-body-construct of a WHERE construct */
8404 cnext = cblock->next;
8409 /* WHERE assignment statement */
8412 /* Check shape consistent for WHERE assignment target. */
8413 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
8414 gfc_error ("WHERE assignment target at %L has "
8415 "inconsistent shape", &cnext->expr1->where);
8419 case EXEC_ASSIGN_CALL:
8420 resolve_call (cnext);
8421 if (!cnext->resolved_sym->attr.elemental)
8422 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8423 &cnext->ext.actual->expr->where);
8426 /* WHERE or WHERE construct is part of a where-body-construct */
8428 resolve_where (cnext, e);
8432 gfc_error ("Unsupported statement inside WHERE at %L",
8435 /* the next statement within the same where-body-construct */
8436 cnext = cnext->next;
8438 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8439 cblock = cblock->block;
8444 /* Resolve assignment in FORALL construct.
8445 NVAR is the number of FORALL index variables, and VAR_EXPR records the
8446 FORALL index variables. */
8449 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
8453 for (n = 0; n < nvar; n++)
8455 gfc_symbol *forall_index;
8457 forall_index = var_expr[n]->symtree->n.sym;
8459 /* Check whether the assignment target is one of the FORALL index
8461 if ((code->expr1->expr_type == EXPR_VARIABLE)
8462 && (code->expr1->symtree->n.sym == forall_index))
8463 gfc_error ("Assignment to a FORALL index variable at %L",
8464 &code->expr1->where);
8467 /* If one of the FORALL index variables doesn't appear in the
8468 assignment variable, then there could be a many-to-one
8469 assignment. Emit a warning rather than an error because the
8470 mask could be resolving this problem. */
8471 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
8472 gfc_warning ("The FORALL with index '%s' is not used on the "
8473 "left side of the assignment at %L and so might "
8474 "cause multiple assignment to this object",
8475 var_expr[n]->symtree->name, &code->expr1->where);
8481 /* Resolve WHERE statement in FORALL construct. */
8484 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
8485 gfc_expr **var_expr)
8490 cblock = code->block;
8493 /* the assignment statement of a WHERE statement, or the first
8494 statement in where-body-construct of a WHERE construct */
8495 cnext = cblock->next;
8500 /* WHERE assignment statement */
8502 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
8505 /* WHERE operator assignment statement */
8506 case EXEC_ASSIGN_CALL:
8507 resolve_call (cnext);
8508 if (!cnext->resolved_sym->attr.elemental)
8509 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8510 &cnext->ext.actual->expr->where);
8513 /* WHERE or WHERE construct is part of a where-body-construct */
8515 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
8519 gfc_error ("Unsupported statement inside WHERE at %L",
8522 /* the next statement within the same where-body-construct */
8523 cnext = cnext->next;
8525 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8526 cblock = cblock->block;
8531 /* Traverse the FORALL body to check whether the following errors exist:
8532 1. For assignment, check if a many-to-one assignment happens.
8533 2. For WHERE statement, check the WHERE body to see if there is any
8534 many-to-one assignment. */
8537 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8541 c = code->block->next;
8547 case EXEC_POINTER_ASSIGN:
8548 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8551 case EXEC_ASSIGN_CALL:
8555 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8556 there is no need to handle it here. */
8560 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8565 /* The next statement in the FORALL body. */
8571 /* Counts the number of iterators needed inside a forall construct, including
8572 nested forall constructs. This is used to allocate the needed memory
8573 in gfc_resolve_forall. */
8576 gfc_count_forall_iterators (gfc_code *code)
8578 int max_iters, sub_iters, current_iters;
8579 gfc_forall_iterator *fa;
8581 gcc_assert(code->op == EXEC_FORALL);
8585 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8588 code = code->block->next;
8592 if (code->op == EXEC_FORALL)
8594 sub_iters = gfc_count_forall_iterators (code);
8595 if (sub_iters > max_iters)
8596 max_iters = sub_iters;
8601 return current_iters + max_iters;
8605 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8606 gfc_resolve_forall_body to resolve the FORALL body. */
8609 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8611 static gfc_expr **var_expr;
8612 static int total_var = 0;
8613 static int nvar = 0;
8615 gfc_forall_iterator *fa;
8620 /* Start to resolve a FORALL construct */
8621 if (forall_save == 0)
8623 /* Count the total number of FORALL index in the nested FORALL
8624 construct in order to allocate the VAR_EXPR with proper size. */
8625 total_var = gfc_count_forall_iterators (code);
8627 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8628 var_expr = XCNEWVEC (gfc_expr *, total_var);
8631 /* The information about FORALL iterator, including FORALL index start, end
8632 and stride. The FORALL index can not appear in start, end or stride. */
8633 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8635 /* Check if any outer FORALL index name is the same as the current
8637 for (i = 0; i < nvar; i++)
8639 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8641 gfc_error ("An outer FORALL construct already has an index "
8642 "with this name %L", &fa->var->where);
8646 /* Record the current FORALL index. */
8647 var_expr[nvar] = gfc_copy_expr (fa->var);
8651 /* No memory leak. */
8652 gcc_assert (nvar <= total_var);
8655 /* Resolve the FORALL body. */
8656 gfc_resolve_forall_body (code, nvar, var_expr);
8658 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8659 gfc_resolve_blocks (code->block, ns);
8663 /* Free only the VAR_EXPRs allocated in this frame. */
8664 for (i = nvar; i < tmp; i++)
8665 gfc_free_expr (var_expr[i]);
8669 /* We are in the outermost FORALL construct. */
8670 gcc_assert (forall_save == 0);
8672 /* VAR_EXPR is not needed any more. */
8679 /* Resolve a BLOCK construct statement. */
8682 resolve_block_construct (gfc_code* code)
8684 /* Resolve the BLOCK's namespace. */
8685 gfc_resolve (code->ext.block.ns);
8687 /* For an ASSOCIATE block, the associations (and their targets) are already
8688 resolved during resolve_symbol. */
8692 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8695 static void resolve_code (gfc_code *, gfc_namespace *);
8698 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8702 for (; b; b = b->block)
8704 t = gfc_resolve_expr (b->expr1);
8705 if (gfc_resolve_expr (b->expr2) == FAILURE)
8711 if (t == SUCCESS && b->expr1 != NULL
8712 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8713 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8720 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8721 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8726 resolve_branch (b->label1, b);
8730 resolve_block_construct (b);
8734 case EXEC_SELECT_TYPE:
8745 case EXEC_OMP_ATOMIC:
8746 case EXEC_OMP_CRITICAL:
8748 case EXEC_OMP_MASTER:
8749 case EXEC_OMP_ORDERED:
8750 case EXEC_OMP_PARALLEL:
8751 case EXEC_OMP_PARALLEL_DO:
8752 case EXEC_OMP_PARALLEL_SECTIONS:
8753 case EXEC_OMP_PARALLEL_WORKSHARE:
8754 case EXEC_OMP_SECTIONS:
8755 case EXEC_OMP_SINGLE:
8757 case EXEC_OMP_TASKWAIT:
8758 case EXEC_OMP_WORKSHARE:
8762 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8765 resolve_code (b->next, ns);
8770 /* Does everything to resolve an ordinary assignment. Returns true
8771 if this is an interface assignment. */
8773 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8783 if (gfc_extend_assign (code, ns) == SUCCESS)
8787 if (code->op == EXEC_ASSIGN_CALL)
8789 lhs = code->ext.actual->expr;
8790 rhsptr = &code->ext.actual->next->expr;
8794 gfc_actual_arglist* args;
8795 gfc_typebound_proc* tbp;
8797 gcc_assert (code->op == EXEC_COMPCALL);
8799 args = code->expr1->value.compcall.actual;
8801 rhsptr = &args->next->expr;
8803 tbp = code->expr1->value.compcall.tbp;
8804 gcc_assert (!tbp->is_generic);
8807 /* Make a temporary rhs when there is a default initializer
8808 and rhs is the same symbol as the lhs. */
8809 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8810 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8811 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8812 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8813 *rhsptr = gfc_get_parentheses (*rhsptr);
8822 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8823 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8824 &code->loc) == FAILURE)
8827 /* Handle the case of a BOZ literal on the RHS. */
8828 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8831 if (gfc_option.warn_surprising)
8832 gfc_warning ("BOZ literal at %L is bitwise transferred "
8833 "non-integer symbol '%s'", &code->loc,
8834 lhs->symtree->n.sym->name);
8836 if (!gfc_convert_boz (rhs, &lhs->ts))
8838 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8840 if (rc == ARITH_UNDERFLOW)
8841 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8842 ". This check can be disabled with the option "
8843 "-fno-range-check", &rhs->where);
8844 else if (rc == ARITH_OVERFLOW)
8845 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8846 ". This check can be disabled with the option "
8847 "-fno-range-check", &rhs->where);
8848 else if (rc == ARITH_NAN)
8849 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
8850 ". This check can be disabled with the option "
8851 "-fno-range-check", &rhs->where);
8856 if (lhs->ts.type == BT_CHARACTER
8857 && gfc_option.warn_character_truncation)
8859 if (lhs->ts.u.cl != NULL
8860 && lhs->ts.u.cl->length != NULL
8861 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8862 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
8864 if (rhs->expr_type == EXPR_CONSTANT)
8865 rlen = rhs->value.character.length;
8867 else if (rhs->ts.u.cl != NULL
8868 && rhs->ts.u.cl->length != NULL
8869 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
8870 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
8872 if (rlen && llen && rlen > llen)
8873 gfc_warning_now ("CHARACTER expression will be truncated "
8874 "in assignment (%d/%d) at %L",
8875 llen, rlen, &code->loc);
8878 /* Ensure that a vector index expression for the lvalue is evaluated
8879 to a temporary if the lvalue symbol is referenced in it. */
8882 for (ref = lhs->ref; ref; ref= ref->next)
8883 if (ref->type == REF_ARRAY)
8885 for (n = 0; n < ref->u.ar.dimen; n++)
8886 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
8887 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
8888 ref->u.ar.start[n]))
8890 = gfc_get_parentheses (ref->u.ar.start[n]);
8894 if (gfc_pure (NULL))
8896 if (lhs->ts.type == BT_DERIVED
8897 && lhs->expr_type == EXPR_VARIABLE
8898 && lhs->ts.u.derived->attr.pointer_comp
8899 && rhs->expr_type == EXPR_VARIABLE
8900 && (gfc_impure_variable (rhs->symtree->n.sym)
8901 || gfc_is_coindexed (rhs)))
8904 if (gfc_is_coindexed (rhs))
8905 gfc_error ("Coindexed expression at %L is assigned to "
8906 "a derived type variable with a POINTER "
8907 "component in a PURE procedure",
8910 gfc_error ("The impure variable at %L is assigned to "
8911 "a derived type variable with a POINTER "
8912 "component in a PURE procedure (12.6)",
8917 /* Fortran 2008, C1283. */
8918 if (gfc_is_coindexed (lhs))
8920 gfc_error ("Assignment to coindexed variable at %L in a PURE "
8921 "procedure", &rhs->where);
8926 if (gfc_implicit_pure (NULL))
8928 if (lhs->expr_type == EXPR_VARIABLE
8929 && lhs->symtree->n.sym != gfc_current_ns->proc_name
8930 && lhs->symtree->n.sym->ns != gfc_current_ns)
8931 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8933 if (lhs->ts.type == BT_DERIVED
8934 && lhs->expr_type == EXPR_VARIABLE
8935 && lhs->ts.u.derived->attr.pointer_comp
8936 && rhs->expr_type == EXPR_VARIABLE
8937 && (gfc_impure_variable (rhs->symtree->n.sym)
8938 || gfc_is_coindexed (rhs)))
8939 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8941 /* Fortran 2008, C1283. */
8942 if (gfc_is_coindexed (lhs))
8943 gfc_current_ns->proc_name->attr.implicit_pure = 0;
8947 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
8948 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
8949 if (lhs->ts.type == BT_CLASS)
8951 gfc_error ("Variable must not be polymorphic in assignment at %L",
8956 /* F2008, Section 7.2.1.2. */
8957 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
8959 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
8960 "component in assignment at %L", &lhs->where);
8964 gfc_check_assign (lhs, rhs, 1);
8969 /* Given a block of code, recursively resolve everything pointed to by this
8973 resolve_code (gfc_code *code, gfc_namespace *ns)
8975 int omp_workshare_save;
8980 frame.prev = cs_base;
8984 find_reachable_labels (code);
8986 for (; code; code = code->next)
8988 frame.current = code;
8989 forall_save = forall_flag;
8991 if (code->op == EXEC_FORALL)
8994 gfc_resolve_forall (code, ns, forall_save);
8997 else if (code->block)
8999 omp_workshare_save = -1;
9002 case EXEC_OMP_PARALLEL_WORKSHARE:
9003 omp_workshare_save = omp_workshare_flag;
9004 omp_workshare_flag = 1;
9005 gfc_resolve_omp_parallel_blocks (code, ns);
9007 case EXEC_OMP_PARALLEL:
9008 case EXEC_OMP_PARALLEL_DO:
9009 case EXEC_OMP_PARALLEL_SECTIONS:
9011 omp_workshare_save = omp_workshare_flag;
9012 omp_workshare_flag = 0;
9013 gfc_resolve_omp_parallel_blocks (code, ns);
9016 gfc_resolve_omp_do_blocks (code, ns);
9018 case EXEC_SELECT_TYPE:
9019 /* Blocks are handled in resolve_select_type because we have
9020 to transform the SELECT TYPE into ASSOCIATE first. */
9022 case EXEC_OMP_WORKSHARE:
9023 omp_workshare_save = omp_workshare_flag;
9024 omp_workshare_flag = 1;
9027 gfc_resolve_blocks (code->block, ns);
9031 if (omp_workshare_save != -1)
9032 omp_workshare_flag = omp_workshare_save;
9036 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
9037 t = gfc_resolve_expr (code->expr1);
9038 forall_flag = forall_save;
9040 if (gfc_resolve_expr (code->expr2) == FAILURE)
9043 if (code->op == EXEC_ALLOCATE
9044 && gfc_resolve_expr (code->expr3) == FAILURE)
9050 case EXEC_END_BLOCK:
9054 case EXEC_ERROR_STOP:
9058 case EXEC_ASSIGN_CALL:
9063 case EXEC_SYNC_IMAGES:
9064 case EXEC_SYNC_MEMORY:
9065 resolve_sync (code);
9069 /* Keep track of which entry we are up to. */
9070 current_entry_id = code->ext.entry->id;
9074 resolve_where (code, NULL);
9078 if (code->expr1 != NULL)
9080 if (code->expr1->ts.type != BT_INTEGER)
9081 gfc_error ("ASSIGNED GOTO statement at %L requires an "
9082 "INTEGER variable", &code->expr1->where);
9083 else if (code->expr1->symtree->n.sym->attr.assign != 1)
9084 gfc_error ("Variable '%s' has not been assigned a target "
9085 "label at %L", code->expr1->symtree->n.sym->name,
9086 &code->expr1->where);
9089 resolve_branch (code->label1, code);
9093 if (code->expr1 != NULL
9094 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
9095 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
9096 "INTEGER return specifier", &code->expr1->where);
9099 case EXEC_INIT_ASSIGN:
9100 case EXEC_END_PROCEDURE:
9107 if (gfc_check_vardef_context (code->expr1, false, _("assignment"))
9111 if (resolve_ordinary_assign (code, ns))
9113 if (code->op == EXEC_COMPCALL)
9120 case EXEC_LABEL_ASSIGN:
9121 if (code->label1->defined == ST_LABEL_UNKNOWN)
9122 gfc_error ("Label %d referenced at %L is never defined",
9123 code->label1->value, &code->label1->where);
9125 && (code->expr1->expr_type != EXPR_VARIABLE
9126 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
9127 || code->expr1->symtree->n.sym->ts.kind
9128 != gfc_default_integer_kind
9129 || code->expr1->symtree->n.sym->as != NULL))
9130 gfc_error ("ASSIGN statement at %L requires a scalar "
9131 "default INTEGER variable", &code->expr1->where);
9134 case EXEC_POINTER_ASSIGN:
9141 /* This is both a variable definition and pointer assignment
9142 context, so check both of them. For rank remapping, a final
9143 array ref may be present on the LHS and fool gfc_expr_attr
9144 used in gfc_check_vardef_context. Remove it. */
9145 e = remove_last_array_ref (code->expr1);
9146 t = gfc_check_vardef_context (e, true, _("pointer assignment"));
9148 t = gfc_check_vardef_context (e, false, _("pointer assignment"));
9153 gfc_check_pointer_assign (code->expr1, code->expr2);
9157 case EXEC_ARITHMETIC_IF:
9159 && code->expr1->ts.type != BT_INTEGER
9160 && code->expr1->ts.type != BT_REAL)
9161 gfc_error ("Arithmetic IF statement at %L requires a numeric "
9162 "expression", &code->expr1->where);
9164 resolve_branch (code->label1, code);
9165 resolve_branch (code->label2, code);
9166 resolve_branch (code->label3, code);
9170 if (t == SUCCESS && code->expr1 != NULL
9171 && (code->expr1->ts.type != BT_LOGICAL
9172 || code->expr1->rank != 0))
9173 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
9174 &code->expr1->where);
9179 resolve_call (code);
9184 resolve_typebound_subroutine (code);
9188 resolve_ppc_call (code);
9192 /* Select is complicated. Also, a SELECT construct could be
9193 a transformed computed GOTO. */
9194 resolve_select (code);
9197 case EXEC_SELECT_TYPE:
9198 resolve_select_type (code, ns);
9202 resolve_block_construct (code);
9206 if (code->ext.iterator != NULL)
9208 gfc_iterator *iter = code->ext.iterator;
9209 if (gfc_resolve_iterator (iter, true) != FAILURE)
9210 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
9215 if (code->expr1 == NULL)
9216 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
9218 && (code->expr1->rank != 0
9219 || code->expr1->ts.type != BT_LOGICAL))
9220 gfc_error ("Exit condition of DO WHILE loop at %L must be "
9221 "a scalar LOGICAL expression", &code->expr1->where);
9226 resolve_allocate_deallocate (code, "ALLOCATE");
9230 case EXEC_DEALLOCATE:
9232 resolve_allocate_deallocate (code, "DEALLOCATE");
9237 if (gfc_resolve_open (code->ext.open) == FAILURE)
9240 resolve_branch (code->ext.open->err, code);
9244 if (gfc_resolve_close (code->ext.close) == FAILURE)
9247 resolve_branch (code->ext.close->err, code);
9250 case EXEC_BACKSPACE:
9254 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
9257 resolve_branch (code->ext.filepos->err, code);
9261 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9264 resolve_branch (code->ext.inquire->err, code);
9268 gcc_assert (code->ext.inquire != NULL);
9269 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9272 resolve_branch (code->ext.inquire->err, code);
9276 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
9279 resolve_branch (code->ext.wait->err, code);
9280 resolve_branch (code->ext.wait->end, code);
9281 resolve_branch (code->ext.wait->eor, code);
9286 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
9289 resolve_branch (code->ext.dt->err, code);
9290 resolve_branch (code->ext.dt->end, code);
9291 resolve_branch (code->ext.dt->eor, code);
9295 resolve_transfer (code);
9299 resolve_forall_iterators (code->ext.forall_iterator);
9301 if (code->expr1 != NULL
9302 && (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank))
9303 gfc_error ("FORALL mask clause at %L requires a scalar LOGICAL "
9304 "expression", &code->expr1->where);
9307 case EXEC_OMP_ATOMIC:
9308 case EXEC_OMP_BARRIER:
9309 case EXEC_OMP_CRITICAL:
9310 case EXEC_OMP_FLUSH:
9312 case EXEC_OMP_MASTER:
9313 case EXEC_OMP_ORDERED:
9314 case EXEC_OMP_SECTIONS:
9315 case EXEC_OMP_SINGLE:
9316 case EXEC_OMP_TASKWAIT:
9317 case EXEC_OMP_WORKSHARE:
9318 gfc_resolve_omp_directive (code, ns);
9321 case EXEC_OMP_PARALLEL:
9322 case EXEC_OMP_PARALLEL_DO:
9323 case EXEC_OMP_PARALLEL_SECTIONS:
9324 case EXEC_OMP_PARALLEL_WORKSHARE:
9326 omp_workshare_save = omp_workshare_flag;
9327 omp_workshare_flag = 0;
9328 gfc_resolve_omp_directive (code, ns);
9329 omp_workshare_flag = omp_workshare_save;
9333 gfc_internal_error ("resolve_code(): Bad statement code");
9337 cs_base = frame.prev;
9341 /* Resolve initial values and make sure they are compatible with
9345 resolve_values (gfc_symbol *sym)
9349 if (sym->value == NULL)
9352 if (sym->value->expr_type == EXPR_STRUCTURE)
9353 t= resolve_structure_cons (sym->value, 1);
9355 t = gfc_resolve_expr (sym->value);
9360 gfc_check_assign_symbol (sym, sym->value);
9364 /* Verify the binding labels for common blocks that are BIND(C). The label
9365 for a BIND(C) common block must be identical in all scoping units in which
9366 the common block is declared. Further, the binding label can not collide
9367 with any other global entity in the program. */
9370 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
9372 if (comm_block_tree->n.common->is_bind_c == 1)
9374 gfc_gsymbol *binding_label_gsym;
9375 gfc_gsymbol *comm_name_gsym;
9377 /* See if a global symbol exists by the common block's name. It may
9378 be NULL if the common block is use-associated. */
9379 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
9380 comm_block_tree->n.common->name);
9381 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
9382 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
9383 "with the global entity '%s' at %L",
9384 comm_block_tree->n.common->binding_label,
9385 comm_block_tree->n.common->name,
9386 &(comm_block_tree->n.common->where),
9387 comm_name_gsym->name, &(comm_name_gsym->where));
9388 else if (comm_name_gsym != NULL
9389 && strcmp (comm_name_gsym->name,
9390 comm_block_tree->n.common->name) == 0)
9392 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
9394 if (comm_name_gsym->binding_label == NULL)
9395 /* No binding label for common block stored yet; save this one. */
9396 comm_name_gsym->binding_label =
9397 comm_block_tree->n.common->binding_label;
9399 if (strcmp (comm_name_gsym->binding_label,
9400 comm_block_tree->n.common->binding_label) != 0)
9402 /* Common block names match but binding labels do not. */
9403 gfc_error ("Binding label '%s' for common block '%s' at %L "
9404 "does not match the binding label '%s' for common "
9406 comm_block_tree->n.common->binding_label,
9407 comm_block_tree->n.common->name,
9408 &(comm_block_tree->n.common->where),
9409 comm_name_gsym->binding_label,
9410 comm_name_gsym->name,
9411 &(comm_name_gsym->where));
9416 /* There is no binding label (NAME="") so we have nothing further to
9417 check and nothing to add as a global symbol for the label. */
9418 if (comm_block_tree->n.common->binding_label[0] == '\0' )
9421 binding_label_gsym =
9422 gfc_find_gsymbol (gfc_gsym_root,
9423 comm_block_tree->n.common->binding_label);
9424 if (binding_label_gsym == NULL)
9426 /* Need to make a global symbol for the binding label to prevent
9427 it from colliding with another. */
9428 binding_label_gsym =
9429 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
9430 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
9431 binding_label_gsym->type = GSYM_COMMON;
9435 /* If comm_name_gsym is NULL, the name common block is use
9436 associated and the name could be colliding. */
9437 if (binding_label_gsym->type != GSYM_COMMON)
9438 gfc_error ("Binding label '%s' for common block '%s' at %L "
9439 "collides with the global entity '%s' at %L",
9440 comm_block_tree->n.common->binding_label,
9441 comm_block_tree->n.common->name,
9442 &(comm_block_tree->n.common->where),
9443 binding_label_gsym->name,
9444 &(binding_label_gsym->where));
9445 else if (comm_name_gsym != NULL
9446 && (strcmp (binding_label_gsym->name,
9447 comm_name_gsym->binding_label) != 0)
9448 && (strcmp (binding_label_gsym->sym_name,
9449 comm_name_gsym->name) != 0))
9450 gfc_error ("Binding label '%s' for common block '%s' at %L "
9451 "collides with global entity '%s' at %L",
9452 binding_label_gsym->name, binding_label_gsym->sym_name,
9453 &(comm_block_tree->n.common->where),
9454 comm_name_gsym->name, &(comm_name_gsym->where));
9462 /* Verify any BIND(C) derived types in the namespace so we can report errors
9463 for them once, rather than for each variable declared of that type. */
9466 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
9468 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
9469 && derived_sym->attr.is_bind_c == 1)
9470 verify_bind_c_derived_type (derived_sym);
9476 /* Verify that any binding labels used in a given namespace do not collide
9477 with the names or binding labels of any global symbols. */
9480 gfc_verify_binding_labels (gfc_symbol *sym)
9484 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
9485 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
9487 gfc_gsymbol *bind_c_sym;
9489 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
9490 if (bind_c_sym != NULL
9491 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
9493 if (sym->attr.if_source == IFSRC_DECL
9494 && (bind_c_sym->type != GSYM_SUBROUTINE
9495 && bind_c_sym->type != GSYM_FUNCTION)
9496 && ((sym->attr.contained == 1
9497 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
9498 || (sym->attr.use_assoc == 1
9499 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
9501 /* Make sure global procedures don't collide with anything. */
9502 gfc_error ("Binding label '%s' at %L collides with the global "
9503 "entity '%s' at %L", sym->binding_label,
9504 &(sym->declared_at), bind_c_sym->name,
9505 &(bind_c_sym->where));
9508 else if (sym->attr.contained == 0
9509 && (sym->attr.if_source == IFSRC_IFBODY
9510 && sym->attr.flavor == FL_PROCEDURE)
9511 && (bind_c_sym->sym_name != NULL
9512 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
9514 /* Make sure procedures in interface bodies don't collide. */
9515 gfc_error ("Binding label '%s' in interface body at %L collides "
9516 "with the global entity '%s' at %L",
9518 &(sym->declared_at), bind_c_sym->name,
9519 &(bind_c_sym->where));
9522 else if (sym->attr.contained == 0
9523 && sym->attr.if_source == IFSRC_UNKNOWN)
9524 if ((sym->attr.use_assoc && bind_c_sym->mod_name
9525 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
9526 || sym->attr.use_assoc == 0)
9528 gfc_error ("Binding label '%s' at %L collides with global "
9529 "entity '%s' at %L", sym->binding_label,
9530 &(sym->declared_at), bind_c_sym->name,
9531 &(bind_c_sym->where));
9536 /* Clear the binding label to prevent checking multiple times. */
9537 sym->binding_label[0] = '\0';
9539 else if (bind_c_sym == NULL)
9541 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
9542 bind_c_sym->where = sym->declared_at;
9543 bind_c_sym->sym_name = sym->name;
9545 if (sym->attr.use_assoc == 1)
9546 bind_c_sym->mod_name = sym->module;
9548 if (sym->ns->proc_name != NULL)
9549 bind_c_sym->mod_name = sym->ns->proc_name->name;
9551 if (sym->attr.contained == 0)
9553 if (sym->attr.subroutine)
9554 bind_c_sym->type = GSYM_SUBROUTINE;
9555 else if (sym->attr.function)
9556 bind_c_sym->type = GSYM_FUNCTION;
9564 /* Resolve an index expression. */
9567 resolve_index_expr (gfc_expr *e)
9569 if (gfc_resolve_expr (e) == FAILURE)
9572 if (gfc_simplify_expr (e, 0) == FAILURE)
9575 if (gfc_specification_expr (e) == FAILURE)
9582 /* Resolve a charlen structure. */
9585 resolve_charlen (gfc_charlen *cl)
9594 specification_expr = 1;
9596 if (resolve_index_expr (cl->length) == FAILURE)
9598 specification_expr = 0;
9602 /* "If the character length parameter value evaluates to a negative
9603 value, the length of character entities declared is zero." */
9604 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9606 if (gfc_option.warn_surprising)
9607 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9608 " the length has been set to zero",
9609 &cl->length->where, i);
9610 gfc_replace_expr (cl->length,
9611 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9614 /* Check that the character length is not too large. */
9615 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9616 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9617 && cl->length->ts.type == BT_INTEGER
9618 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9620 gfc_error ("String length at %L is too large", &cl->length->where);
9628 /* Test for non-constant shape arrays. */
9631 is_non_constant_shape_array (gfc_symbol *sym)
9637 not_constant = false;
9638 if (sym->as != NULL)
9640 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9641 has not been simplified; parameter array references. Do the
9642 simplification now. */
9643 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9645 e = sym->as->lower[i];
9646 if (e && (resolve_index_expr (e) == FAILURE
9647 || !gfc_is_constant_expr (e)))
9648 not_constant = true;
9649 e = sym->as->upper[i];
9650 if (e && (resolve_index_expr (e) == FAILURE
9651 || !gfc_is_constant_expr (e)))
9652 not_constant = true;
9655 return not_constant;
9658 /* Given a symbol and an initialization expression, add code to initialize
9659 the symbol to the function entry. */
9661 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9665 gfc_namespace *ns = sym->ns;
9667 /* Search for the function namespace if this is a contained
9668 function without an explicit result. */
9669 if (sym->attr.function && sym == sym->result
9670 && sym->name != sym->ns->proc_name->name)
9673 for (;ns; ns = ns->sibling)
9674 if (strcmp (ns->proc_name->name, sym->name) == 0)
9680 gfc_free_expr (init);
9684 /* Build an l-value expression for the result. */
9685 lval = gfc_lval_expr_from_sym (sym);
9687 /* Add the code at scope entry. */
9688 init_st = gfc_get_code ();
9689 init_st->next = ns->code;
9692 /* Assign the default initializer to the l-value. */
9693 init_st->loc = sym->declared_at;
9694 init_st->op = EXEC_INIT_ASSIGN;
9695 init_st->expr1 = lval;
9696 init_st->expr2 = init;
9699 /* Assign the default initializer to a derived type variable or result. */
9702 apply_default_init (gfc_symbol *sym)
9704 gfc_expr *init = NULL;
9706 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9709 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9710 init = gfc_default_initializer (&sym->ts);
9712 if (init == NULL && sym->ts.type != BT_CLASS)
9715 build_init_assign (sym, init);
9716 sym->attr.referenced = 1;
9719 /* Build an initializer for a local integer, real, complex, logical, or
9720 character variable, based on the command line flags finit-local-zero,
9721 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9722 null if the symbol should not have a default initialization. */
9724 build_default_init_expr (gfc_symbol *sym)
9727 gfc_expr *init_expr;
9730 /* These symbols should never have a default initialization. */
9731 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9732 || sym->attr.external
9734 || sym->attr.pointer
9735 || sym->attr.in_equivalence
9736 || sym->attr.in_common
9739 || sym->attr.cray_pointee
9740 || sym->attr.cray_pointer)
9743 /* Now we'll try to build an initializer expression. */
9744 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9747 /* We will only initialize integers, reals, complex, logicals, and
9748 characters, and only if the corresponding command-line flags
9749 were set. Otherwise, we free init_expr and return null. */
9750 switch (sym->ts.type)
9753 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9754 mpz_set_si (init_expr->value.integer,
9755 gfc_option.flag_init_integer_value);
9758 gfc_free_expr (init_expr);
9764 switch (gfc_option.flag_init_real)
9766 case GFC_INIT_REAL_SNAN:
9767 init_expr->is_snan = 1;
9769 case GFC_INIT_REAL_NAN:
9770 mpfr_set_nan (init_expr->value.real);
9773 case GFC_INIT_REAL_INF:
9774 mpfr_set_inf (init_expr->value.real, 1);
9777 case GFC_INIT_REAL_NEG_INF:
9778 mpfr_set_inf (init_expr->value.real, -1);
9781 case GFC_INIT_REAL_ZERO:
9782 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9786 gfc_free_expr (init_expr);
9793 switch (gfc_option.flag_init_real)
9795 case GFC_INIT_REAL_SNAN:
9796 init_expr->is_snan = 1;
9798 case GFC_INIT_REAL_NAN:
9799 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9800 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9803 case GFC_INIT_REAL_INF:
9804 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9805 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9808 case GFC_INIT_REAL_NEG_INF:
9809 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9810 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9813 case GFC_INIT_REAL_ZERO:
9814 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9818 gfc_free_expr (init_expr);
9825 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9826 init_expr->value.logical = 0;
9827 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9828 init_expr->value.logical = 1;
9831 gfc_free_expr (init_expr);
9837 /* For characters, the length must be constant in order to
9838 create a default initializer. */
9839 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
9840 && sym->ts.u.cl->length
9841 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9843 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
9844 init_expr->value.character.length = char_len;
9845 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
9846 for (i = 0; i < char_len; i++)
9847 init_expr->value.character.string[i]
9848 = (unsigned char) gfc_option.flag_init_character_value;
9852 gfc_free_expr (init_expr);
9858 gfc_free_expr (init_expr);
9864 /* Add an initialization expression to a local variable. */
9866 apply_default_init_local (gfc_symbol *sym)
9868 gfc_expr *init = NULL;
9870 /* The symbol should be a variable or a function return value. */
9871 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9872 || (sym->attr.function && sym->result != sym))
9875 /* Try to build the initializer expression. If we can't initialize
9876 this symbol, then init will be NULL. */
9877 init = build_default_init_expr (sym);
9881 /* For saved variables, we don't want to add an initializer at
9882 function entry, so we just add a static initializer. */
9883 if (sym->attr.save || sym->ns->save_all
9884 || gfc_option.flag_max_stack_var_size == 0)
9886 /* Don't clobber an existing initializer! */
9887 gcc_assert (sym->value == NULL);
9892 build_init_assign (sym, init);
9896 /* Resolution of common features of flavors variable and procedure. */
9899 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
9901 /* Avoid double diagnostics for function result symbols. */
9902 if ((sym->result || sym->attr.result) && !sym->attr.dummy
9903 && (sym->ns != gfc_current_ns))
9906 /* Constraints on deferred shape variable. */
9907 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
9909 if (sym->attr.allocatable)
9911 if (sym->attr.dimension)
9913 gfc_error ("Allocatable array '%s' at %L must have "
9914 "a deferred shape", sym->name, &sym->declared_at);
9917 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
9918 "may not be ALLOCATABLE", sym->name,
9919 &sym->declared_at) == FAILURE)
9923 if (sym->attr.pointer && sym->attr.dimension)
9925 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
9926 sym->name, &sym->declared_at);
9932 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
9933 && sym->ts.type != BT_CLASS && !sym->assoc)
9935 gfc_error ("Array '%s' at %L cannot have a deferred shape",
9936 sym->name, &sym->declared_at);
9941 /* Constraints on polymorphic variables. */
9942 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
9945 if (sym->attr.class_ok
9946 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
9948 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
9949 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
9955 /* Assume that use associated symbols were checked in the module ns.
9956 Class-variables that are associate-names are also something special
9957 and excepted from the test. */
9958 if (!sym->attr.class_ok && !sym->attr.use_assoc && !sym->assoc)
9960 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
9961 "or pointer", sym->name, &sym->declared_at);
9970 /* Additional checks for symbols with flavor variable and derived
9971 type. To be called from resolve_fl_variable. */
9974 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
9976 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
9978 /* Check to see if a derived type is blocked from being host
9979 associated by the presence of another class I symbol in the same
9980 namespace. 14.6.1.3 of the standard and the discussion on
9981 comp.lang.fortran. */
9982 if (sym->ns != sym->ts.u.derived->ns
9983 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
9986 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
9987 if (s && s->attr.flavor != FL_DERIVED)
9989 gfc_error ("The type '%s' cannot be host associated at %L "
9990 "because it is blocked by an incompatible object "
9991 "of the same name declared at %L",
9992 sym->ts.u.derived->name, &sym->declared_at,
9998 /* 4th constraint in section 11.3: "If an object of a type for which
9999 component-initialization is specified (R429) appears in the
10000 specification-part of a module and does not have the ALLOCATABLE
10001 or POINTER attribute, the object shall have the SAVE attribute."
10003 The check for initializers is performed with
10004 gfc_has_default_initializer because gfc_default_initializer generates
10005 a hidden default for allocatable components. */
10006 if (!(sym->value || no_init_flag) && sym->ns->proc_name
10007 && sym->ns->proc_name->attr.flavor == FL_MODULE
10008 && !sym->ns->save_all && !sym->attr.save
10009 && !sym->attr.pointer && !sym->attr.allocatable
10010 && gfc_has_default_initializer (sym->ts.u.derived)
10011 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
10012 "module variable '%s' at %L, needed due to "
10013 "the default initialization", sym->name,
10014 &sym->declared_at) == FAILURE)
10017 /* Assign default initializer. */
10018 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
10019 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
10021 sym->value = gfc_default_initializer (&sym->ts);
10028 /* Resolve symbols with flavor variable. */
10031 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
10033 int no_init_flag, automatic_flag;
10035 const char *auto_save_msg;
10037 auto_save_msg = "Automatic object '%s' at %L cannot have the "
10040 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10043 /* Set this flag to check that variables are parameters of all entries.
10044 This check is effected by the call to gfc_resolve_expr through
10045 is_non_constant_shape_array. */
10046 specification_expr = 1;
10048 if (sym->ns->proc_name
10049 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10050 || sym->ns->proc_name->attr.is_main_program)
10051 && !sym->attr.use_assoc
10052 && !sym->attr.allocatable
10053 && !sym->attr.pointer
10054 && is_non_constant_shape_array (sym))
10056 /* The shape of a main program or module array needs to be
10058 gfc_error ("The module or main program array '%s' at %L must "
10059 "have constant shape", sym->name, &sym->declared_at);
10060 specification_expr = 0;
10064 /* Constraints on deferred type parameter. */
10065 if (sym->ts.deferred && !(sym->attr.pointer || sym->attr.allocatable))
10067 gfc_error ("Entity '%s' at %L has a deferred type parameter and "
10068 "requires either the pointer or allocatable attribute",
10069 sym->name, &sym->declared_at);
10073 if (sym->ts.type == BT_CHARACTER)
10075 /* Make sure that character string variables with assumed length are
10076 dummy arguments. */
10077 e = sym->ts.u.cl->length;
10078 if (e == NULL && !sym->attr.dummy && !sym->attr.result
10079 && !sym->ts.deferred)
10081 gfc_error ("Entity with assumed character length at %L must be a "
10082 "dummy argument or a PARAMETER", &sym->declared_at);
10086 if (e && sym->attr.save == SAVE_EXPLICIT && !gfc_is_constant_expr (e))
10088 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10092 if (!gfc_is_constant_expr (e)
10093 && !(e->expr_type == EXPR_VARIABLE
10094 && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
10095 && sym->ns->proc_name
10096 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10097 || sym->ns->proc_name->attr.is_main_program)
10098 && !sym->attr.use_assoc)
10100 gfc_error ("'%s' at %L must have constant character length "
10101 "in this context", sym->name, &sym->declared_at);
10106 if (sym->value == NULL && sym->attr.referenced)
10107 apply_default_init_local (sym); /* Try to apply a default initialization. */
10109 /* Determine if the symbol may not have an initializer. */
10110 no_init_flag = automatic_flag = 0;
10111 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
10112 || sym->attr.intrinsic || sym->attr.result)
10114 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
10115 && is_non_constant_shape_array (sym))
10117 no_init_flag = automatic_flag = 1;
10119 /* Also, they must not have the SAVE attribute.
10120 SAVE_IMPLICIT is checked below. */
10121 if (sym->as && sym->attr.codimension)
10123 int corank = sym->as->corank;
10124 sym->as->corank = 0;
10125 no_init_flag = automatic_flag = is_non_constant_shape_array (sym);
10126 sym->as->corank = corank;
10128 if (automatic_flag && sym->attr.save == SAVE_EXPLICIT)
10130 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10135 /* Ensure that any initializer is simplified. */
10137 gfc_simplify_expr (sym->value, 1);
10139 /* Reject illegal initializers. */
10140 if (!sym->mark && sym->value)
10142 if (sym->attr.allocatable || (sym->ts.type == BT_CLASS
10143 && CLASS_DATA (sym)->attr.allocatable))
10144 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
10145 sym->name, &sym->declared_at);
10146 else if (sym->attr.external)
10147 gfc_error ("External '%s' at %L cannot have an initializer",
10148 sym->name, &sym->declared_at);
10149 else if (sym->attr.dummy
10150 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
10151 gfc_error ("Dummy '%s' at %L cannot have an initializer",
10152 sym->name, &sym->declared_at);
10153 else if (sym->attr.intrinsic)
10154 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
10155 sym->name, &sym->declared_at);
10156 else if (sym->attr.result)
10157 gfc_error ("Function result '%s' at %L cannot have an initializer",
10158 sym->name, &sym->declared_at);
10159 else if (automatic_flag)
10160 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
10161 sym->name, &sym->declared_at);
10163 goto no_init_error;
10168 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
10169 return resolve_fl_variable_derived (sym, no_init_flag);
10175 /* Resolve a procedure. */
10178 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
10180 gfc_formal_arglist *arg;
10182 if (sym->attr.function
10183 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10186 if (sym->ts.type == BT_CHARACTER)
10188 gfc_charlen *cl = sym->ts.u.cl;
10190 if (cl && cl->length && gfc_is_constant_expr (cl->length)
10191 && resolve_charlen (cl) == FAILURE)
10194 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10195 && sym->attr.proc == PROC_ST_FUNCTION)
10197 gfc_error ("Character-valued statement function '%s' at %L must "
10198 "have constant length", sym->name, &sym->declared_at);
10203 /* Ensure that derived type for are not of a private type. Internal
10204 module procedures are excluded by 2.2.3.3 - i.e., they are not
10205 externally accessible and can access all the objects accessible in
10207 if (!(sym->ns->parent
10208 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
10209 && gfc_check_symbol_access (sym))
10211 gfc_interface *iface;
10213 for (arg = sym->formal; arg; arg = arg->next)
10216 && arg->sym->ts.type == BT_DERIVED
10217 && !arg->sym->ts.u.derived->attr.use_assoc
10218 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10219 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
10220 "PRIVATE type and cannot be a dummy argument"
10221 " of '%s', which is PUBLIC at %L",
10222 arg->sym->name, sym->name, &sym->declared_at)
10225 /* Stop this message from recurring. */
10226 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10231 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10232 PRIVATE to the containing module. */
10233 for (iface = sym->generic; iface; iface = iface->next)
10235 for (arg = iface->sym->formal; arg; arg = arg->next)
10238 && arg->sym->ts.type == BT_DERIVED
10239 && !arg->sym->ts.u.derived->attr.use_assoc
10240 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10241 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10242 "'%s' in PUBLIC interface '%s' at %L "
10243 "takes dummy arguments of '%s' which is "
10244 "PRIVATE", iface->sym->name, sym->name,
10245 &iface->sym->declared_at,
10246 gfc_typename (&arg->sym->ts)) == FAILURE)
10248 /* Stop this message from recurring. */
10249 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10255 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10256 PRIVATE to the containing module. */
10257 for (iface = sym->generic; iface; iface = iface->next)
10259 for (arg = iface->sym->formal; arg; arg = arg->next)
10262 && arg->sym->ts.type == BT_DERIVED
10263 && !arg->sym->ts.u.derived->attr.use_assoc
10264 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10265 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10266 "'%s' in PUBLIC interface '%s' at %L "
10267 "takes dummy arguments of '%s' which is "
10268 "PRIVATE", iface->sym->name, sym->name,
10269 &iface->sym->declared_at,
10270 gfc_typename (&arg->sym->ts)) == FAILURE)
10272 /* Stop this message from recurring. */
10273 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10280 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
10281 && !sym->attr.proc_pointer)
10283 gfc_error ("Function '%s' at %L cannot have an initializer",
10284 sym->name, &sym->declared_at);
10288 /* An external symbol may not have an initializer because it is taken to be
10289 a procedure. Exception: Procedure Pointers. */
10290 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
10292 gfc_error ("External object '%s' at %L may not have an initializer",
10293 sym->name, &sym->declared_at);
10297 /* An elemental function is required to return a scalar 12.7.1 */
10298 if (sym->attr.elemental && sym->attr.function && sym->as)
10300 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
10301 "result", sym->name, &sym->declared_at);
10302 /* Reset so that the error only occurs once. */
10303 sym->attr.elemental = 0;
10307 if (sym->attr.proc == PROC_ST_FUNCTION
10308 && (sym->attr.allocatable || sym->attr.pointer))
10310 gfc_error ("Statement function '%s' at %L may not have pointer or "
10311 "allocatable attribute", sym->name, &sym->declared_at);
10315 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
10316 char-len-param shall not be array-valued, pointer-valued, recursive
10317 or pure. ....snip... A character value of * may only be used in the
10318 following ways: (i) Dummy arg of procedure - dummy associates with
10319 actual length; (ii) To declare a named constant; or (iii) External
10320 function - but length must be declared in calling scoping unit. */
10321 if (sym->attr.function
10322 && sym->ts.type == BT_CHARACTER
10323 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
10325 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
10326 || (sym->attr.recursive) || (sym->attr.pure))
10328 if (sym->as && sym->as->rank)
10329 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10330 "array-valued", sym->name, &sym->declared_at);
10332 if (sym->attr.pointer)
10333 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10334 "pointer-valued", sym->name, &sym->declared_at);
10336 if (sym->attr.pure)
10337 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10338 "pure", sym->name, &sym->declared_at);
10340 if (sym->attr.recursive)
10341 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10342 "recursive", sym->name, &sym->declared_at);
10347 /* Appendix B.2 of the standard. Contained functions give an
10348 error anyway. Fixed-form is likely to be F77/legacy. Deferred
10349 character length is an F2003 feature. */
10350 if (!sym->attr.contained
10351 && gfc_current_form != FORM_FIXED
10352 && !sym->ts.deferred)
10353 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
10354 "CHARACTER(*) function '%s' at %L",
10355 sym->name, &sym->declared_at);
10358 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
10360 gfc_formal_arglist *curr_arg;
10361 int has_non_interop_arg = 0;
10363 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10364 sym->common_block) == FAILURE)
10366 /* Clear these to prevent looking at them again if there was an
10368 sym->attr.is_bind_c = 0;
10369 sym->attr.is_c_interop = 0;
10370 sym->ts.is_c_interop = 0;
10374 /* So far, no errors have been found. */
10375 sym->attr.is_c_interop = 1;
10376 sym->ts.is_c_interop = 1;
10379 curr_arg = sym->formal;
10380 while (curr_arg != NULL)
10382 /* Skip implicitly typed dummy args here. */
10383 if (curr_arg->sym->attr.implicit_type == 0)
10384 if (verify_c_interop_param (curr_arg->sym) == FAILURE)
10385 /* If something is found to fail, record the fact so we
10386 can mark the symbol for the procedure as not being
10387 BIND(C) to try and prevent multiple errors being
10389 has_non_interop_arg = 1;
10391 curr_arg = curr_arg->next;
10394 /* See if any of the arguments were not interoperable and if so, clear
10395 the procedure symbol to prevent duplicate error messages. */
10396 if (has_non_interop_arg != 0)
10398 sym->attr.is_c_interop = 0;
10399 sym->ts.is_c_interop = 0;
10400 sym->attr.is_bind_c = 0;
10404 if (!sym->attr.proc_pointer)
10406 if (sym->attr.save == SAVE_EXPLICIT)
10408 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
10409 "in '%s' at %L", sym->name, &sym->declared_at);
10412 if (sym->attr.intent)
10414 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
10415 "in '%s' at %L", sym->name, &sym->declared_at);
10418 if (sym->attr.subroutine && sym->attr.result)
10420 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
10421 "in '%s' at %L", sym->name, &sym->declared_at);
10424 if (sym->attr.external && sym->attr.function
10425 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
10426 || sym->attr.contained))
10428 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
10429 "in '%s' at %L", sym->name, &sym->declared_at);
10432 if (strcmp ("ppr@", sym->name) == 0)
10434 gfc_error ("Procedure pointer result '%s' at %L "
10435 "is missing the pointer attribute",
10436 sym->ns->proc_name->name, &sym->declared_at);
10445 /* Resolve a list of finalizer procedures. That is, after they have hopefully
10446 been defined and we now know their defined arguments, check that they fulfill
10447 the requirements of the standard for procedures used as finalizers. */
10450 gfc_resolve_finalizers (gfc_symbol* derived)
10452 gfc_finalizer* list;
10453 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
10454 gfc_try result = SUCCESS;
10455 bool seen_scalar = false;
10457 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
10460 /* Walk over the list of finalizer-procedures, check them, and if any one
10461 does not fit in with the standard's definition, print an error and remove
10462 it from the list. */
10463 prev_link = &derived->f2k_derived->finalizers;
10464 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
10470 /* Skip this finalizer if we already resolved it. */
10471 if (list->proc_tree)
10473 prev_link = &(list->next);
10477 /* Check this exists and is a SUBROUTINE. */
10478 if (!list->proc_sym->attr.subroutine)
10480 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
10481 list->proc_sym->name, &list->where);
10485 /* We should have exactly one argument. */
10486 if (!list->proc_sym->formal || list->proc_sym->formal->next)
10488 gfc_error ("FINAL procedure at %L must have exactly one argument",
10492 arg = list->proc_sym->formal->sym;
10494 /* This argument must be of our type. */
10495 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
10497 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
10498 &arg->declared_at, derived->name);
10502 /* It must neither be a pointer nor allocatable nor optional. */
10503 if (arg->attr.pointer)
10505 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
10506 &arg->declared_at);
10509 if (arg->attr.allocatable)
10511 gfc_error ("Argument of FINAL procedure at %L must not be"
10512 " ALLOCATABLE", &arg->declared_at);
10515 if (arg->attr.optional)
10517 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
10518 &arg->declared_at);
10522 /* It must not be INTENT(OUT). */
10523 if (arg->attr.intent == INTENT_OUT)
10525 gfc_error ("Argument of FINAL procedure at %L must not be"
10526 " INTENT(OUT)", &arg->declared_at);
10530 /* Warn if the procedure is non-scalar and not assumed shape. */
10531 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
10532 && arg->as->type != AS_ASSUMED_SHAPE)
10533 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
10534 " shape argument", &arg->declared_at);
10536 /* Check that it does not match in kind and rank with a FINAL procedure
10537 defined earlier. To really loop over the *earlier* declarations,
10538 we need to walk the tail of the list as new ones were pushed at the
10540 /* TODO: Handle kind parameters once they are implemented. */
10541 my_rank = (arg->as ? arg->as->rank : 0);
10542 for (i = list->next; i; i = i->next)
10544 /* Argument list might be empty; that is an error signalled earlier,
10545 but we nevertheless continued resolving. */
10546 if (i->proc_sym->formal)
10548 gfc_symbol* i_arg = i->proc_sym->formal->sym;
10549 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
10550 if (i_rank == my_rank)
10552 gfc_error ("FINAL procedure '%s' declared at %L has the same"
10553 " rank (%d) as '%s'",
10554 list->proc_sym->name, &list->where, my_rank,
10555 i->proc_sym->name);
10561 /* Is this the/a scalar finalizer procedure? */
10562 if (!arg->as || arg->as->rank == 0)
10563 seen_scalar = true;
10565 /* Find the symtree for this procedure. */
10566 gcc_assert (!list->proc_tree);
10567 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
10569 prev_link = &list->next;
10572 /* Remove wrong nodes immediately from the list so we don't risk any
10573 troubles in the future when they might fail later expectations. */
10577 *prev_link = list->next;
10578 gfc_free_finalizer (i);
10581 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
10582 were nodes in the list, must have been for arrays. It is surely a good
10583 idea to have a scalar version there if there's something to finalize. */
10584 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
10585 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
10586 " defined at %L, suggest also scalar one",
10587 derived->name, &derived->declared_at);
10589 /* TODO: Remove this error when finalization is finished. */
10590 gfc_error ("Finalization at %L is not yet implemented",
10591 &derived->declared_at);
10597 /* Check that it is ok for the typebound procedure proc to override the
10601 check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
10604 const gfc_symbol* proc_target;
10605 const gfc_symbol* old_target;
10606 unsigned proc_pass_arg, old_pass_arg, argpos;
10607 gfc_formal_arglist* proc_formal;
10608 gfc_formal_arglist* old_formal;
10610 /* This procedure should only be called for non-GENERIC proc. */
10611 gcc_assert (!proc->n.tb->is_generic);
10613 /* If the overwritten procedure is GENERIC, this is an error. */
10614 if (old->n.tb->is_generic)
10616 gfc_error ("Can't overwrite GENERIC '%s' at %L",
10617 old->name, &proc->n.tb->where);
10621 where = proc->n.tb->where;
10622 proc_target = proc->n.tb->u.specific->n.sym;
10623 old_target = old->n.tb->u.specific->n.sym;
10625 /* Check that overridden binding is not NON_OVERRIDABLE. */
10626 if (old->n.tb->non_overridable)
10628 gfc_error ("'%s' at %L overrides a procedure binding declared"
10629 " NON_OVERRIDABLE", proc->name, &where);
10633 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
10634 if (!old->n.tb->deferred && proc->n.tb->deferred)
10636 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
10637 " non-DEFERRED binding", proc->name, &where);
10641 /* If the overridden binding is PURE, the overriding must be, too. */
10642 if (old_target->attr.pure && !proc_target->attr.pure)
10644 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
10645 proc->name, &where);
10649 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
10650 is not, the overriding must not be either. */
10651 if (old_target->attr.elemental && !proc_target->attr.elemental)
10653 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
10654 " ELEMENTAL", proc->name, &where);
10657 if (!old_target->attr.elemental && proc_target->attr.elemental)
10659 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
10660 " be ELEMENTAL, either", proc->name, &where);
10664 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
10666 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
10668 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
10669 " SUBROUTINE", proc->name, &where);
10673 /* If the overridden binding is a FUNCTION, the overriding must also be a
10674 FUNCTION and have the same characteristics. */
10675 if (old_target->attr.function)
10677 if (!proc_target->attr.function)
10679 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
10680 " FUNCTION", proc->name, &where);
10684 /* FIXME: Do more comprehensive checking (including, for instance, the
10685 rank and array-shape). */
10686 gcc_assert (proc_target->result && old_target->result);
10687 if (!gfc_compare_types (&proc_target->result->ts,
10688 &old_target->result->ts))
10690 gfc_error ("'%s' at %L and the overridden FUNCTION should have"
10691 " matching result types", proc->name, &where);
10696 /* If the overridden binding is PUBLIC, the overriding one must not be
10698 if (old->n.tb->access == ACCESS_PUBLIC
10699 && proc->n.tb->access == ACCESS_PRIVATE)
10701 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
10702 " PRIVATE", proc->name, &where);
10706 /* Compare the formal argument lists of both procedures. This is also abused
10707 to find the position of the passed-object dummy arguments of both
10708 bindings as at least the overridden one might not yet be resolved and we
10709 need those positions in the check below. */
10710 proc_pass_arg = old_pass_arg = 0;
10711 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
10713 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
10716 for (proc_formal = proc_target->formal, old_formal = old_target->formal;
10717 proc_formal && old_formal;
10718 proc_formal = proc_formal->next, old_formal = old_formal->next)
10720 if (proc->n.tb->pass_arg
10721 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
10722 proc_pass_arg = argpos;
10723 if (old->n.tb->pass_arg
10724 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
10725 old_pass_arg = argpos;
10727 /* Check that the names correspond. */
10728 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
10730 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
10731 " to match the corresponding argument of the overridden"
10732 " procedure", proc_formal->sym->name, proc->name, &where,
10733 old_formal->sym->name);
10737 /* Check that the types correspond if neither is the passed-object
10739 /* FIXME: Do more comprehensive testing here. */
10740 if (proc_pass_arg != argpos && old_pass_arg != argpos
10741 && !gfc_compare_types (&proc_formal->sym->ts, &old_formal->sym->ts))
10743 gfc_error ("Types mismatch for dummy argument '%s' of '%s' %L "
10744 "in respect to the overridden procedure",
10745 proc_formal->sym->name, proc->name, &where);
10751 if (proc_formal || old_formal)
10753 gfc_error ("'%s' at %L must have the same number of formal arguments as"
10754 " the overridden procedure", proc->name, &where);
10758 /* If the overridden binding is NOPASS, the overriding one must also be
10760 if (old->n.tb->nopass && !proc->n.tb->nopass)
10762 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
10763 " NOPASS", proc->name, &where);
10767 /* If the overridden binding is PASS(x), the overriding one must also be
10768 PASS and the passed-object dummy arguments must correspond. */
10769 if (!old->n.tb->nopass)
10771 if (proc->n.tb->nopass)
10773 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
10774 " PASS", proc->name, &where);
10778 if (proc_pass_arg != old_pass_arg)
10780 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
10781 " the same position as the passed-object dummy argument of"
10782 " the overridden procedure", proc->name, &where);
10791 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10794 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10795 const char* generic_name, locus where)
10800 gcc_assert (t1->specific && t2->specific);
10801 gcc_assert (!t1->specific->is_generic);
10802 gcc_assert (!t2->specific->is_generic);
10804 sym1 = t1->specific->u.specific->n.sym;
10805 sym2 = t2->specific->u.specific->n.sym;
10810 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10811 if (sym1->attr.subroutine != sym2->attr.subroutine
10812 || sym1->attr.function != sym2->attr.function)
10814 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10815 " GENERIC '%s' at %L",
10816 sym1->name, sym2->name, generic_name, &where);
10820 /* Compare the interfaces. */
10821 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10823 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10824 sym1->name, sym2->name, generic_name, &where);
10832 /* Worker function for resolving a generic procedure binding; this is used to
10833 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10835 The difference between those cases is finding possible inherited bindings
10836 that are overridden, as one has to look for them in tb_sym_root,
10837 tb_uop_root or tb_op, respectively. Thus the caller must already find
10838 the super-type and set p->overridden correctly. */
10841 resolve_tb_generic_targets (gfc_symbol* super_type,
10842 gfc_typebound_proc* p, const char* name)
10844 gfc_tbp_generic* target;
10845 gfc_symtree* first_target;
10846 gfc_symtree* inherited;
10848 gcc_assert (p && p->is_generic);
10850 /* Try to find the specific bindings for the symtrees in our target-list. */
10851 gcc_assert (p->u.generic);
10852 for (target = p->u.generic; target; target = target->next)
10853 if (!target->specific)
10855 gfc_typebound_proc* overridden_tbp;
10856 gfc_tbp_generic* g;
10857 const char* target_name;
10859 target_name = target->specific_st->name;
10861 /* Defined for this type directly. */
10862 if (target->specific_st->n.tb && !target->specific_st->n.tb->error)
10864 target->specific = target->specific_st->n.tb;
10865 goto specific_found;
10868 /* Look for an inherited specific binding. */
10871 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10876 gcc_assert (inherited->n.tb);
10877 target->specific = inherited->n.tb;
10878 goto specific_found;
10882 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10883 " at %L", target_name, name, &p->where);
10886 /* Once we've found the specific binding, check it is not ambiguous with
10887 other specifics already found or inherited for the same GENERIC. */
10889 gcc_assert (target->specific);
10891 /* This must really be a specific binding! */
10892 if (target->specific->is_generic)
10894 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10895 " '%s' is GENERIC, too", name, &p->where, target_name);
10899 /* Check those already resolved on this type directly. */
10900 for (g = p->u.generic; g; g = g->next)
10901 if (g != target && g->specific
10902 && check_generic_tbp_ambiguity (target, g, name, p->where)
10906 /* Check for ambiguity with inherited specific targets. */
10907 for (overridden_tbp = p->overridden; overridden_tbp;
10908 overridden_tbp = overridden_tbp->overridden)
10909 if (overridden_tbp->is_generic)
10911 for (g = overridden_tbp->u.generic; g; g = g->next)
10913 gcc_assert (g->specific);
10914 if (check_generic_tbp_ambiguity (target, g,
10915 name, p->where) == FAILURE)
10921 /* If we attempt to "overwrite" a specific binding, this is an error. */
10922 if (p->overridden && !p->overridden->is_generic)
10924 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10925 " the same name", name, &p->where);
10929 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10930 all must have the same attributes here. */
10931 first_target = p->u.generic->specific->u.specific;
10932 gcc_assert (first_target);
10933 p->subroutine = first_target->n.sym->attr.subroutine;
10934 p->function = first_target->n.sym->attr.function;
10940 /* Resolve a GENERIC procedure binding for a derived type. */
10943 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10945 gfc_symbol* super_type;
10947 /* Find the overridden binding if any. */
10948 st->n.tb->overridden = NULL;
10949 super_type = gfc_get_derived_super_type (derived);
10952 gfc_symtree* overridden;
10953 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10956 if (overridden && overridden->n.tb)
10957 st->n.tb->overridden = overridden->n.tb;
10960 /* Resolve using worker function. */
10961 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10965 /* Retrieve the target-procedure of an operator binding and do some checks in
10966 common for intrinsic and user-defined type-bound operators. */
10969 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10971 gfc_symbol* target_proc;
10973 gcc_assert (target->specific && !target->specific->is_generic);
10974 target_proc = target->specific->u.specific->n.sym;
10975 gcc_assert (target_proc);
10977 /* All operator bindings must have a passed-object dummy argument. */
10978 if (target->specific->nopass)
10980 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10984 return target_proc;
10988 /* Resolve a type-bound intrinsic operator. */
10991 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10992 gfc_typebound_proc* p)
10994 gfc_symbol* super_type;
10995 gfc_tbp_generic* target;
10997 /* If there's already an error here, do nothing (but don't fail again). */
11001 /* Operators should always be GENERIC bindings. */
11002 gcc_assert (p->is_generic);
11004 /* Look for an overridden binding. */
11005 super_type = gfc_get_derived_super_type (derived);
11006 if (super_type && super_type->f2k_derived)
11007 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
11010 p->overridden = NULL;
11012 /* Resolve general GENERIC properties using worker function. */
11013 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
11016 /* Check the targets to be procedures of correct interface. */
11017 for (target = p->u.generic; target; target = target->next)
11019 gfc_symbol* target_proc;
11021 target_proc = get_checked_tb_operator_target (target, p->where);
11025 if (!gfc_check_operator_interface (target_proc, op, p->where))
11037 /* Resolve a type-bound user operator (tree-walker callback). */
11039 static gfc_symbol* resolve_bindings_derived;
11040 static gfc_try resolve_bindings_result;
11042 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
11045 resolve_typebound_user_op (gfc_symtree* stree)
11047 gfc_symbol* super_type;
11048 gfc_tbp_generic* target;
11050 gcc_assert (stree && stree->n.tb);
11052 if (stree->n.tb->error)
11055 /* Operators should always be GENERIC bindings. */
11056 gcc_assert (stree->n.tb->is_generic);
11058 /* Find overridden procedure, if any. */
11059 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11060 if (super_type && super_type->f2k_derived)
11062 gfc_symtree* overridden;
11063 overridden = gfc_find_typebound_user_op (super_type, NULL,
11064 stree->name, true, NULL);
11066 if (overridden && overridden->n.tb)
11067 stree->n.tb->overridden = overridden->n.tb;
11070 stree->n.tb->overridden = NULL;
11072 /* Resolve basically using worker function. */
11073 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
11077 /* Check the targets to be functions of correct interface. */
11078 for (target = stree->n.tb->u.generic; target; target = target->next)
11080 gfc_symbol* target_proc;
11082 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
11086 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
11093 resolve_bindings_result = FAILURE;
11094 stree->n.tb->error = 1;
11098 /* Resolve the type-bound procedures for a derived type. */
11101 resolve_typebound_procedure (gfc_symtree* stree)
11105 gfc_symbol* me_arg;
11106 gfc_symbol* super_type;
11107 gfc_component* comp;
11109 gcc_assert (stree);
11111 /* Undefined specific symbol from GENERIC target definition. */
11115 if (stree->n.tb->error)
11118 /* If this is a GENERIC binding, use that routine. */
11119 if (stree->n.tb->is_generic)
11121 if (resolve_typebound_generic (resolve_bindings_derived, stree)
11127 /* Get the target-procedure to check it. */
11128 gcc_assert (!stree->n.tb->is_generic);
11129 gcc_assert (stree->n.tb->u.specific);
11130 proc = stree->n.tb->u.specific->n.sym;
11131 where = stree->n.tb->where;
11133 /* Default access should already be resolved from the parser. */
11134 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
11136 /* It should be a module procedure or an external procedure with explicit
11137 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
11138 if ((!proc->attr.subroutine && !proc->attr.function)
11139 || (proc->attr.proc != PROC_MODULE
11140 && proc->attr.if_source != IFSRC_IFBODY)
11141 || (proc->attr.abstract && !stree->n.tb->deferred))
11143 gfc_error ("'%s' must be a module procedure or an external procedure with"
11144 " an explicit interface at %L", proc->name, &where);
11147 stree->n.tb->subroutine = proc->attr.subroutine;
11148 stree->n.tb->function = proc->attr.function;
11150 /* Find the super-type of the current derived type. We could do this once and
11151 store in a global if speed is needed, but as long as not I believe this is
11152 more readable and clearer. */
11153 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11155 /* If PASS, resolve and check arguments if not already resolved / loaded
11156 from a .mod file. */
11157 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
11159 if (stree->n.tb->pass_arg)
11161 gfc_formal_arglist* i;
11163 /* If an explicit passing argument name is given, walk the arg-list
11164 and look for it. */
11167 stree->n.tb->pass_arg_num = 1;
11168 for (i = proc->formal; i; i = i->next)
11170 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
11175 ++stree->n.tb->pass_arg_num;
11180 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
11182 proc->name, stree->n.tb->pass_arg, &where,
11183 stree->n.tb->pass_arg);
11189 /* Otherwise, take the first one; there should in fact be at least
11191 stree->n.tb->pass_arg_num = 1;
11194 gfc_error ("Procedure '%s' with PASS at %L must have at"
11195 " least one argument", proc->name, &where);
11198 me_arg = proc->formal->sym;
11201 /* Now check that the argument-type matches and the passed-object
11202 dummy argument is generally fine. */
11204 gcc_assert (me_arg);
11206 if (me_arg->ts.type != BT_CLASS)
11208 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11209 " at %L", proc->name, &where);
11213 if (CLASS_DATA (me_arg)->ts.u.derived
11214 != resolve_bindings_derived)
11216 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11217 " the derived-type '%s'", me_arg->name, proc->name,
11218 me_arg->name, &where, resolve_bindings_derived->name);
11222 gcc_assert (me_arg->ts.type == BT_CLASS);
11223 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
11225 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
11226 " scalar", proc->name, &where);
11229 if (CLASS_DATA (me_arg)->attr.allocatable)
11231 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11232 " be ALLOCATABLE", proc->name, &where);
11235 if (CLASS_DATA (me_arg)->attr.class_pointer)
11237 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11238 " be POINTER", proc->name, &where);
11243 /* If we are extending some type, check that we don't override a procedure
11244 flagged NON_OVERRIDABLE. */
11245 stree->n.tb->overridden = NULL;
11248 gfc_symtree* overridden;
11249 overridden = gfc_find_typebound_proc (super_type, NULL,
11250 stree->name, true, NULL);
11252 if (overridden && overridden->n.tb)
11253 stree->n.tb->overridden = overridden->n.tb;
11255 if (overridden && check_typebound_override (stree, overridden) == FAILURE)
11259 /* See if there's a name collision with a component directly in this type. */
11260 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
11261 if (!strcmp (comp->name, stree->name))
11263 gfc_error ("Procedure '%s' at %L has the same name as a component of"
11265 stree->name, &where, resolve_bindings_derived->name);
11269 /* Try to find a name collision with an inherited component. */
11270 if (super_type && gfc_find_component (super_type, stree->name, true, true))
11272 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
11273 " component of '%s'",
11274 stree->name, &where, resolve_bindings_derived->name);
11278 stree->n.tb->error = 0;
11282 resolve_bindings_result = FAILURE;
11283 stree->n.tb->error = 1;
11288 resolve_typebound_procedures (gfc_symbol* derived)
11292 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
11295 resolve_bindings_derived = derived;
11296 resolve_bindings_result = SUCCESS;
11298 /* Make sure the vtab has been generated. */
11299 gfc_find_derived_vtab (derived);
11301 if (derived->f2k_derived->tb_sym_root)
11302 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
11303 &resolve_typebound_procedure);
11305 if (derived->f2k_derived->tb_uop_root)
11306 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
11307 &resolve_typebound_user_op);
11309 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
11311 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
11312 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
11314 resolve_bindings_result = FAILURE;
11317 return resolve_bindings_result;
11321 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
11322 to give all identical derived types the same backend_decl. */
11324 add_dt_to_dt_list (gfc_symbol *derived)
11326 gfc_dt_list *dt_list;
11328 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
11329 if (derived == dt_list->derived)
11332 dt_list = gfc_get_dt_list ();
11333 dt_list->next = gfc_derived_types;
11334 dt_list->derived = derived;
11335 gfc_derived_types = dt_list;
11339 /* Ensure that a derived-type is really not abstract, meaning that every
11340 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
11343 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
11348 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
11350 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
11353 if (st->n.tb && st->n.tb->deferred)
11355 gfc_symtree* overriding;
11356 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
11359 gcc_assert (overriding->n.tb);
11360 if (overriding->n.tb->deferred)
11362 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
11363 " '%s' is DEFERRED and not overridden",
11364 sub->name, &sub->declared_at, st->name);
11373 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
11375 /* The algorithm used here is to recursively travel up the ancestry of sub
11376 and for each ancestor-type, check all bindings. If any of them is
11377 DEFERRED, look it up starting from sub and see if the found (overriding)
11378 binding is not DEFERRED.
11379 This is not the most efficient way to do this, but it should be ok and is
11380 clearer than something sophisticated. */
11382 gcc_assert (ancestor && !sub->attr.abstract);
11384 if (!ancestor->attr.abstract)
11387 /* Walk bindings of this ancestor. */
11388 if (ancestor->f2k_derived)
11391 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
11396 /* Find next ancestor type and recurse on it. */
11397 ancestor = gfc_get_derived_super_type (ancestor);
11399 return ensure_not_abstract (sub, ancestor);
11405 /* Resolve the components of a derived type. */
11408 resolve_fl_derived (gfc_symbol *sym)
11410 gfc_symbol* super_type;
11413 super_type = gfc_get_derived_super_type (sym);
11415 if (sym->attr.is_class && sym->ts.u.derived == NULL)
11417 /* Fix up incomplete CLASS symbols. */
11418 gfc_component *data = gfc_find_component (sym, "_data", true, true);
11419 gfc_component *vptr = gfc_find_component (sym, "_vptr", true, true);
11420 if (vptr->ts.u.derived == NULL)
11422 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
11424 vptr->ts.u.derived = vtab->ts.u.derived;
11429 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
11431 gfc_error ("As extending type '%s' at %L has a coarray component, "
11432 "parent type '%s' shall also have one", sym->name,
11433 &sym->declared_at, super_type->name);
11437 /* Ensure the extended type gets resolved before we do. */
11438 if (super_type && resolve_fl_derived (super_type) == FAILURE)
11441 /* An ABSTRACT type must be extensible. */
11442 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
11444 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
11445 sym->name, &sym->declared_at);
11449 for (c = sym->components; c != NULL; c = c->next)
11452 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
11453 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
11455 gfc_error ("Coarray component '%s' at %L must be allocatable with "
11456 "deferred shape", c->name, &c->loc);
11461 if (c->attr.codimension && c->ts.type == BT_DERIVED
11462 && c->ts.u.derived->ts.is_iso_c)
11464 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11465 "shall not be a coarray", c->name, &c->loc);
11470 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
11471 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
11472 || c->attr.allocatable))
11474 gfc_error ("Component '%s' at %L with coarray component "
11475 "shall be a nonpointer, nonallocatable scalar",
11481 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
11483 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
11484 "is not an array pointer", c->name, &c->loc);
11488 if (c->attr.proc_pointer && c->ts.interface)
11490 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
11491 gfc_error ("Interface '%s', used by procedure pointer component "
11492 "'%s' at %L, is declared in a later PROCEDURE statement",
11493 c->ts.interface->name, c->name, &c->loc);
11495 /* Get the attributes from the interface (now resolved). */
11496 if (c->ts.interface->attr.if_source
11497 || c->ts.interface->attr.intrinsic)
11499 gfc_symbol *ifc = c->ts.interface;
11501 if (ifc->formal && !ifc->formal_ns)
11502 resolve_symbol (ifc);
11504 if (ifc->attr.intrinsic)
11505 resolve_intrinsic (ifc, &ifc->declared_at);
11509 c->ts = ifc->result->ts;
11510 c->attr.allocatable = ifc->result->attr.allocatable;
11511 c->attr.pointer = ifc->result->attr.pointer;
11512 c->attr.dimension = ifc->result->attr.dimension;
11513 c->as = gfc_copy_array_spec (ifc->result->as);
11518 c->attr.allocatable = ifc->attr.allocatable;
11519 c->attr.pointer = ifc->attr.pointer;
11520 c->attr.dimension = ifc->attr.dimension;
11521 c->as = gfc_copy_array_spec (ifc->as);
11523 c->ts.interface = ifc;
11524 c->attr.function = ifc->attr.function;
11525 c->attr.subroutine = ifc->attr.subroutine;
11526 gfc_copy_formal_args_ppc (c, ifc);
11528 c->attr.pure = ifc->attr.pure;
11529 c->attr.elemental = ifc->attr.elemental;
11530 c->attr.recursive = ifc->attr.recursive;
11531 c->attr.always_explicit = ifc->attr.always_explicit;
11532 c->attr.ext_attr |= ifc->attr.ext_attr;
11533 /* Replace symbols in array spec. */
11537 for (i = 0; i < c->as->rank; i++)
11539 gfc_expr_replace_comp (c->as->lower[i], c);
11540 gfc_expr_replace_comp (c->as->upper[i], c);
11543 /* Copy char length. */
11544 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11546 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11547 gfc_expr_replace_comp (cl->length, c);
11548 if (cl->length && !cl->resolved
11549 && gfc_resolve_expr (cl->length) == FAILURE)
11554 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
11556 gfc_error ("Interface '%s' of procedure pointer component "
11557 "'%s' at %L must be explicit", c->ts.interface->name,
11562 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
11564 /* Since PPCs are not implicitly typed, a PPC without an explicit
11565 interface must be a subroutine. */
11566 gfc_add_subroutine (&c->attr, c->name, &c->loc);
11569 /* Procedure pointer components: Check PASS arg. */
11570 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
11571 && !sym->attr.vtype)
11573 gfc_symbol* me_arg;
11575 if (c->tb->pass_arg)
11577 gfc_formal_arglist* i;
11579 /* If an explicit passing argument name is given, walk the arg-list
11580 and look for it. */
11583 c->tb->pass_arg_num = 1;
11584 for (i = c->formal; i; i = i->next)
11586 if (!strcmp (i->sym->name, c->tb->pass_arg))
11591 c->tb->pass_arg_num++;
11596 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11597 "at %L has no argument '%s'", c->name,
11598 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11605 /* Otherwise, take the first one; there should in fact be at least
11607 c->tb->pass_arg_num = 1;
11610 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11611 "must have at least one argument",
11616 me_arg = c->formal->sym;
11619 /* Now check that the argument-type matches. */
11620 gcc_assert (me_arg);
11621 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11622 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11623 || (me_arg->ts.type == BT_CLASS
11624 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11626 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11627 " the derived type '%s'", me_arg->name, c->name,
11628 me_arg->name, &c->loc, sym->name);
11633 /* Check for C453. */
11634 if (me_arg->attr.dimension)
11636 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11637 "must be scalar", me_arg->name, c->name, me_arg->name,
11643 if (me_arg->attr.pointer)
11645 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11646 "may not have the POINTER attribute", me_arg->name,
11647 c->name, me_arg->name, &c->loc);
11652 if (me_arg->attr.allocatable)
11654 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11655 "may not be ALLOCATABLE", me_arg->name, c->name,
11656 me_arg->name, &c->loc);
11661 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11662 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11663 " at %L", c->name, &c->loc);
11667 /* Check type-spec if this is not the parent-type component. */
11668 if ((!sym->attr.extension || c != sym->components) && !sym->attr.vtype
11669 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11672 /* If this type is an extension, set the accessibility of the parent
11674 if (super_type && c == sym->components
11675 && strcmp (super_type->name, c->name) == 0)
11676 c->attr.access = super_type->attr.access;
11678 /* If this type is an extension, see if this component has the same name
11679 as an inherited type-bound procedure. */
11680 if (super_type && !sym->attr.is_class
11681 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11683 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11684 " inherited type-bound procedure",
11685 c->name, sym->name, &c->loc);
11689 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer
11690 && !c->ts.deferred)
11692 if (c->ts.u.cl->length == NULL
11693 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11694 || !gfc_is_constant_expr (c->ts.u.cl->length))
11696 gfc_error ("Character length of component '%s' needs to "
11697 "be a constant specification expression at %L",
11699 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11704 if (c->ts.type == BT_CHARACTER && c->ts.deferred
11705 && !c->attr.pointer && !c->attr.allocatable)
11707 gfc_error ("Character component '%s' of '%s' at %L with deferred "
11708 "length must be a POINTER or ALLOCATABLE",
11709 c->name, sym->name, &c->loc);
11713 if (c->ts.type == BT_DERIVED
11714 && sym->component_access != ACCESS_PRIVATE
11715 && gfc_check_symbol_access (sym)
11716 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11717 && !c->ts.u.derived->attr.use_assoc
11718 && !gfc_check_symbol_access (c->ts.u.derived)
11719 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11720 "is a PRIVATE type and cannot be a component of "
11721 "'%s', which is PUBLIC at %L", c->name,
11722 sym->name, &sym->declared_at) == FAILURE)
11725 if ((sym->attr.sequence || sym->attr.is_bind_c) && c->ts.type == BT_CLASS)
11727 gfc_error ("Polymorphic component %s at %L in SEQUENCE or BIND(C) "
11728 "type %s", c->name, &c->loc, sym->name);
11732 if (sym->attr.sequence)
11734 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11736 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11737 "not have the SEQUENCE attribute",
11738 c->ts.u.derived->name, &sym->declared_at);
11743 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && !sym->attr.vtype
11744 && c->attr.pointer && c->ts.u.derived->components == NULL
11745 && !c->ts.u.derived->attr.zero_comp)
11747 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11748 "that has not been declared", c->name, sym->name,
11753 if (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.class_pointer
11754 && CLASS_DATA (c)->ts.u.derived->components == NULL
11755 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11757 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11758 "that has not been declared", c->name, sym->name,
11764 if (c->ts.type == BT_CLASS
11765 && !(CLASS_DATA (c)->attr.class_pointer
11766 || CLASS_DATA (c)->attr.allocatable))
11768 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11769 "or pointer", c->name, &c->loc);
11773 /* Ensure that all the derived type components are put on the
11774 derived type list; even in formal namespaces, where derived type
11775 pointer components might not have been declared. */
11776 if (c->ts.type == BT_DERIVED
11778 && c->ts.u.derived->components
11780 && sym != c->ts.u.derived)
11781 add_dt_to_dt_list (c->ts.u.derived);
11783 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11784 || c->attr.proc_pointer
11785 || c->attr.allocatable)) == FAILURE)
11789 /* Resolve the type-bound procedures. */
11790 if (resolve_typebound_procedures (sym) == FAILURE)
11793 /* Resolve the finalizer procedures. */
11794 if (gfc_resolve_finalizers (sym) == FAILURE)
11797 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11798 all DEFERRED bindings are overridden. */
11799 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11800 && !sym->attr.is_class
11801 && ensure_not_abstract (sym, super_type) == FAILURE)
11804 /* Add derived type to the derived type list. */
11805 add_dt_to_dt_list (sym);
11812 resolve_fl_namelist (gfc_symbol *sym)
11817 for (nl = sym->namelist; nl; nl = nl->next)
11819 /* Check again, the check in match only works if NAMELIST comes
11821 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SIZE)
11823 gfc_error ("Assumed size array '%s' in namelist '%s' at %L is not "
11824 "allowed", nl->sym->name, sym->name, &sym->declared_at);
11828 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11829 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11830 "object '%s' with assumed shape in namelist "
11831 "'%s' at %L", nl->sym->name, sym->name,
11832 &sym->declared_at) == FAILURE)
11835 if (is_non_constant_shape_array (nl->sym)
11836 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11837 "object '%s' with nonconstant shape in namelist "
11838 "'%s' at %L", nl->sym->name, sym->name,
11839 &sym->declared_at) == FAILURE)
11842 if (nl->sym->ts.type == BT_CHARACTER
11843 && (nl->sym->ts.u.cl->length == NULL
11844 || !gfc_is_constant_expr (nl->sym->ts.u.cl->length))
11845 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11846 "'%s' with nonconstant character length in "
11847 "namelist '%s' at %L", nl->sym->name, sym->name,
11848 &sym->declared_at) == FAILURE)
11851 /* FIXME: Once UDDTIO is implemented, the following can be
11853 if (nl->sym->ts.type == BT_CLASS)
11855 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L is "
11856 "polymorphic and requires a defined input/output "
11857 "procedure", nl->sym->name, sym->name, &sym->declared_at);
11861 if (nl->sym->ts.type == BT_DERIVED
11862 && (nl->sym->ts.u.derived->attr.alloc_comp
11863 || nl->sym->ts.u.derived->attr.pointer_comp))
11865 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11866 "'%s' in namelist '%s' at %L with ALLOCATABLE "
11867 "or POINTER components", nl->sym->name,
11868 sym->name, &sym->declared_at) == FAILURE)
11871 /* FIXME: Once UDDTIO is implemented, the following can be
11873 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L has "
11874 "ALLOCATABLE or POINTER components and thus requires "
11875 "a defined input/output procedure", nl->sym->name,
11876 sym->name, &sym->declared_at);
11881 /* Reject PRIVATE objects in a PUBLIC namelist. */
11882 if (gfc_check_symbol_access (sym))
11884 for (nl = sym->namelist; nl; nl = nl->next)
11886 if (!nl->sym->attr.use_assoc
11887 && !is_sym_host_assoc (nl->sym, sym->ns)
11888 && !gfc_check_symbol_access (nl->sym))
11890 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11891 "cannot be member of PUBLIC namelist '%s' at %L",
11892 nl->sym->name, sym->name, &sym->declared_at);
11896 /* Types with private components that came here by USE-association. */
11897 if (nl->sym->ts.type == BT_DERIVED
11898 && derived_inaccessible (nl->sym->ts.u.derived))
11900 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11901 "components and cannot be member of namelist '%s' at %L",
11902 nl->sym->name, sym->name, &sym->declared_at);
11906 /* Types with private components that are defined in the same module. */
11907 if (nl->sym->ts.type == BT_DERIVED
11908 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11909 && nl->sym->ts.u.derived->attr.private_comp)
11911 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11912 "cannot be a member of PUBLIC namelist '%s' at %L",
11913 nl->sym->name, sym->name, &sym->declared_at);
11920 /* 14.1.2 A module or internal procedure represent local entities
11921 of the same type as a namelist member and so are not allowed. */
11922 for (nl = sym->namelist; nl; nl = nl->next)
11924 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11927 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11928 if ((nl->sym == sym->ns->proc_name)
11930 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11934 if (nl->sym && nl->sym->name)
11935 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11936 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11938 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11939 "attribute in '%s' at %L", nlsym->name,
11940 &sym->declared_at);
11950 resolve_fl_parameter (gfc_symbol *sym)
11952 /* A parameter array's shape needs to be constant. */
11953 if (sym->as != NULL
11954 && (sym->as->type == AS_DEFERRED
11955 || is_non_constant_shape_array (sym)))
11957 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11958 "or of deferred shape", sym->name, &sym->declared_at);
11962 /* Make sure a parameter that has been implicitly typed still
11963 matches the implicit type, since PARAMETER statements can precede
11964 IMPLICIT statements. */
11965 if (sym->attr.implicit_type
11966 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11969 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11970 "later IMPLICIT type", sym->name, &sym->declared_at);
11974 /* Make sure the types of derived parameters are consistent. This
11975 type checking is deferred until resolution because the type may
11976 refer to a derived type from the host. */
11977 if (sym->ts.type == BT_DERIVED
11978 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11980 gfc_error ("Incompatible derived type in PARAMETER at %L",
11981 &sym->value->where);
11988 /* Do anything necessary to resolve a symbol. Right now, we just
11989 assume that an otherwise unknown symbol is a variable. This sort
11990 of thing commonly happens for symbols in module. */
11993 resolve_symbol (gfc_symbol *sym)
11995 int check_constant, mp_flag;
11996 gfc_symtree *symtree;
11997 gfc_symtree *this_symtree;
12001 if (sym->attr.flavor == FL_UNKNOWN)
12004 /* If we find that a flavorless symbol is an interface in one of the
12005 parent namespaces, find its symtree in this namespace, free the
12006 symbol and set the symtree to point to the interface symbol. */
12007 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
12009 symtree = gfc_find_symtree (ns->sym_root, sym->name);
12010 if (symtree && (symtree->n.sym->generic ||
12011 (symtree->n.sym->attr.flavor == FL_PROCEDURE
12012 && sym->ns->construct_entities)))
12014 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
12016 gfc_release_symbol (sym);
12017 symtree->n.sym->refs++;
12018 this_symtree->n.sym = symtree->n.sym;
12023 /* Otherwise give it a flavor according to such attributes as
12025 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
12026 sym->attr.flavor = FL_VARIABLE;
12029 sym->attr.flavor = FL_PROCEDURE;
12030 if (sym->attr.dimension)
12031 sym->attr.function = 1;
12035 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
12036 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
12038 if (sym->attr.procedure && sym->ts.interface
12039 && sym->attr.if_source != IFSRC_DECL
12040 && resolve_procedure_interface (sym) == FAILURE)
12043 if (sym->attr.is_protected && !sym->attr.proc_pointer
12044 && (sym->attr.procedure || sym->attr.external))
12046 if (sym->attr.external)
12047 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
12048 "at %L", &sym->declared_at);
12050 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
12051 "at %L", &sym->declared_at);
12058 if (sym->attr.contiguous
12059 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
12060 && !sym->attr.pointer)))
12062 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
12063 "array pointer or an assumed-shape array", sym->name,
12064 &sym->declared_at);
12068 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
12071 /* Symbols that are module procedures with results (functions) have
12072 the types and array specification copied for type checking in
12073 procedures that call them, as well as for saving to a module
12074 file. These symbols can't stand the scrutiny that their results
12076 mp_flag = (sym->result != NULL && sym->result != sym);
12078 /* Make sure that the intrinsic is consistent with its internal
12079 representation. This needs to be done before assigning a default
12080 type to avoid spurious warnings. */
12081 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
12082 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
12085 /* Resolve associate names. */
12087 resolve_assoc_var (sym, true);
12089 /* Assign default type to symbols that need one and don't have one. */
12090 if (sym->ts.type == BT_UNKNOWN)
12092 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
12093 gfc_set_default_type (sym, 1, NULL);
12095 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
12096 && !sym->attr.function && !sym->attr.subroutine
12097 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
12098 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
12100 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12102 /* The specific case of an external procedure should emit an error
12103 in the case that there is no implicit type. */
12105 gfc_set_default_type (sym, sym->attr.external, NULL);
12108 /* Result may be in another namespace. */
12109 resolve_symbol (sym->result);
12111 if (!sym->result->attr.proc_pointer)
12113 sym->ts = sym->result->ts;
12114 sym->as = gfc_copy_array_spec (sym->result->as);
12115 sym->attr.dimension = sym->result->attr.dimension;
12116 sym->attr.pointer = sym->result->attr.pointer;
12117 sym->attr.allocatable = sym->result->attr.allocatable;
12118 sym->attr.contiguous = sym->result->attr.contiguous;
12124 /* Assumed size arrays and assumed shape arrays must be dummy
12125 arguments. Array-spec's of implied-shape should have been resolved to
12126 AS_EXPLICIT already. */
12130 gcc_assert (sym->as->type != AS_IMPLIED_SHAPE);
12131 if (((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
12132 || sym->as->type == AS_ASSUMED_SHAPE)
12133 && sym->attr.dummy == 0)
12135 if (sym->as->type == AS_ASSUMED_SIZE)
12136 gfc_error ("Assumed size array at %L must be a dummy argument",
12137 &sym->declared_at);
12139 gfc_error ("Assumed shape array at %L must be a dummy argument",
12140 &sym->declared_at);
12145 /* Make sure symbols with known intent or optional are really dummy
12146 variable. Because of ENTRY statement, this has to be deferred
12147 until resolution time. */
12149 if (!sym->attr.dummy
12150 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
12152 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
12156 if (sym->attr.value && !sym->attr.dummy)
12158 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
12159 "it is not a dummy argument", sym->name, &sym->declared_at);
12163 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
12165 gfc_charlen *cl = sym->ts.u.cl;
12166 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
12168 gfc_error ("Character dummy variable '%s' at %L with VALUE "
12169 "attribute must have constant length",
12170 sym->name, &sym->declared_at);
12174 if (sym->ts.is_c_interop
12175 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
12177 gfc_error ("C interoperable character dummy variable '%s' at %L "
12178 "with VALUE attribute must have length one",
12179 sym->name, &sym->declared_at);
12184 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
12185 do this for something that was implicitly typed because that is handled
12186 in gfc_set_default_type. Handle dummy arguments and procedure
12187 definitions separately. Also, anything that is use associated is not
12188 handled here but instead is handled in the module it is declared in.
12189 Finally, derived type definitions are allowed to be BIND(C) since that
12190 only implies that they're interoperable, and they are checked fully for
12191 interoperability when a variable is declared of that type. */
12192 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
12193 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
12194 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
12196 gfc_try t = SUCCESS;
12198 /* First, make sure the variable is declared at the
12199 module-level scope (J3/04-007, Section 15.3). */
12200 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
12201 sym->attr.in_common == 0)
12203 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
12204 "is neither a COMMON block nor declared at the "
12205 "module level scope", sym->name, &(sym->declared_at));
12208 else if (sym->common_head != NULL)
12210 t = verify_com_block_vars_c_interop (sym->common_head);
12214 /* If type() declaration, we need to verify that the components
12215 of the given type are all C interoperable, etc. */
12216 if (sym->ts.type == BT_DERIVED &&
12217 sym->ts.u.derived->attr.is_c_interop != 1)
12219 /* Make sure the user marked the derived type as BIND(C). If
12220 not, call the verify routine. This could print an error
12221 for the derived type more than once if multiple variables
12222 of that type are declared. */
12223 if (sym->ts.u.derived->attr.is_bind_c != 1)
12224 verify_bind_c_derived_type (sym->ts.u.derived);
12228 /* Verify the variable itself as C interoperable if it
12229 is BIND(C). It is not possible for this to succeed if
12230 the verify_bind_c_derived_type failed, so don't have to handle
12231 any error returned by verify_bind_c_derived_type. */
12232 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
12233 sym->common_block);
12238 /* clear the is_bind_c flag to prevent reporting errors more than
12239 once if something failed. */
12240 sym->attr.is_bind_c = 0;
12245 /* If a derived type symbol has reached this point, without its
12246 type being declared, we have an error. Notice that most
12247 conditions that produce undefined derived types have already
12248 been dealt with. However, the likes of:
12249 implicit type(t) (t) ..... call foo (t) will get us here if
12250 the type is not declared in the scope of the implicit
12251 statement. Change the type to BT_UNKNOWN, both because it is so
12252 and to prevent an ICE. */
12253 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
12254 && !sym->ts.u.derived->attr.zero_comp)
12256 gfc_error ("The derived type '%s' at %L is of type '%s', "
12257 "which has not been defined", sym->name,
12258 &sym->declared_at, sym->ts.u.derived->name);
12259 sym->ts.type = BT_UNKNOWN;
12263 /* Make sure that the derived type has been resolved and that the
12264 derived type is visible in the symbol's namespace, if it is a
12265 module function and is not PRIVATE. */
12266 if (sym->ts.type == BT_DERIVED
12267 && sym->ts.u.derived->attr.use_assoc
12268 && sym->ns->proc_name
12269 && sym->ns->proc_name->attr.flavor == FL_MODULE)
12273 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
12276 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
12277 if (!ds && sym->attr.function && gfc_check_symbol_access (sym))
12279 symtree = gfc_new_symtree (&sym->ns->sym_root,
12280 sym->ts.u.derived->name);
12281 symtree->n.sym = sym->ts.u.derived;
12282 sym->ts.u.derived->refs++;
12286 /* Unless the derived-type declaration is use associated, Fortran 95
12287 does not allow public entries of private derived types.
12288 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
12289 161 in 95-006r3. */
12290 if (sym->ts.type == BT_DERIVED
12291 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
12292 && !sym->ts.u.derived->attr.use_assoc
12293 && gfc_check_symbol_access (sym)
12294 && !gfc_check_symbol_access (sym->ts.u.derived)
12295 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
12296 "of PRIVATE derived type '%s'",
12297 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
12298 : "variable", sym->name, &sym->declared_at,
12299 sym->ts.u.derived->name) == FAILURE)
12302 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
12303 default initialization is defined (5.1.2.4.4). */
12304 if (sym->ts.type == BT_DERIVED
12306 && sym->attr.intent == INTENT_OUT
12308 && sym->as->type == AS_ASSUMED_SIZE)
12310 for (c = sym->ts.u.derived->components; c; c = c->next)
12312 if (c->initializer)
12314 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
12315 "ASSUMED SIZE and so cannot have a default initializer",
12316 sym->name, &sym->declared_at);
12323 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12324 || sym->attr.codimension)
12325 && sym->attr.result)
12326 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
12327 "a coarray component", sym->name, &sym->declared_at);
12330 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
12331 && sym->ts.u.derived->ts.is_iso_c)
12332 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
12333 "shall not be a coarray", sym->name, &sym->declared_at);
12336 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
12337 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
12338 || sym->attr.allocatable))
12339 gfc_error ("Variable '%s' at %L with coarray component "
12340 "shall be a nonpointer, nonallocatable scalar",
12341 sym->name, &sym->declared_at);
12343 /* F2008, C526. The function-result case was handled above. */
12344 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12345 || sym->attr.codimension)
12346 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
12347 || sym->ns->save_all
12348 || sym->ns->proc_name->attr.flavor == FL_MODULE
12349 || sym->ns->proc_name->attr.is_main_program
12350 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
12351 gfc_error ("Variable '%s' at %L is a coarray or has a coarray "
12352 "component and is not ALLOCATABLE, SAVE nor a "
12353 "dummy argument", sym->name, &sym->declared_at);
12354 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
12355 else if (sym->attr.codimension && !sym->attr.allocatable
12356 && sym->as && sym->as->cotype == AS_DEFERRED)
12357 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
12358 "deferred shape", sym->name, &sym->declared_at);
12359 else if (sym->attr.codimension && sym->attr.allocatable
12360 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
12361 gfc_error ("Allocatable coarray variable '%s' at %L must have "
12362 "deferred shape", sym->name, &sym->declared_at);
12366 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12367 || (sym->attr.codimension && sym->attr.allocatable))
12368 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
12369 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
12370 "allocatable coarray or have coarray components",
12371 sym->name, &sym->declared_at);
12373 if (sym->attr.codimension && sym->attr.dummy
12374 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
12375 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
12376 "procedure '%s'", sym->name, &sym->declared_at,
12377 sym->ns->proc_name->name);
12379 switch (sym->attr.flavor)
12382 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
12387 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
12392 if (resolve_fl_namelist (sym) == FAILURE)
12397 if (resolve_fl_parameter (sym) == FAILURE)
12405 /* Resolve array specifier. Check as well some constraints
12406 on COMMON blocks. */
12408 check_constant = sym->attr.in_common && !sym->attr.pointer;
12410 /* Set the formal_arg_flag so that check_conflict will not throw
12411 an error for host associated variables in the specification
12412 expression for an array_valued function. */
12413 if (sym->attr.function && sym->as)
12414 formal_arg_flag = 1;
12416 gfc_resolve_array_spec (sym->as, check_constant);
12418 formal_arg_flag = 0;
12420 /* Resolve formal namespaces. */
12421 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
12422 && !sym->attr.contained && !sym->attr.intrinsic)
12423 gfc_resolve (sym->formal_ns);
12425 /* Make sure the formal namespace is present. */
12426 if (sym->formal && !sym->formal_ns)
12428 gfc_formal_arglist *formal = sym->formal;
12429 while (formal && !formal->sym)
12430 formal = formal->next;
12434 sym->formal_ns = formal->sym->ns;
12435 sym->formal_ns->refs++;
12439 /* Check threadprivate restrictions. */
12440 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
12441 && (!sym->attr.in_common
12442 && sym->module == NULL
12443 && (sym->ns->proc_name == NULL
12444 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
12445 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
12447 /* If we have come this far we can apply default-initializers, as
12448 described in 14.7.5, to those variables that have not already
12449 been assigned one. */
12450 if (sym->ts.type == BT_DERIVED
12451 && sym->ns == gfc_current_ns
12453 && !sym->attr.allocatable
12454 && !sym->attr.alloc_comp)
12456 symbol_attribute *a = &sym->attr;
12458 if ((!a->save && !a->dummy && !a->pointer
12459 && !a->in_common && !a->use_assoc
12460 && (a->referenced || a->result)
12461 && !(a->function && sym != sym->result))
12462 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
12463 apply_default_init (sym);
12466 if (sym->ts.type == BT_CLASS && sym->ns == gfc_current_ns
12467 && sym->attr.dummy && sym->attr.intent == INTENT_OUT
12468 && !CLASS_DATA (sym)->attr.class_pointer
12469 && !CLASS_DATA (sym)->attr.allocatable)
12470 apply_default_init (sym);
12472 /* If this symbol has a type-spec, check it. */
12473 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
12474 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
12475 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
12481 /************* Resolve DATA statements *************/
12485 gfc_data_value *vnode;
12491 /* Advance the values structure to point to the next value in the data list. */
12494 next_data_value (void)
12496 while (mpz_cmp_ui (values.left, 0) == 0)
12499 if (values.vnode->next == NULL)
12502 values.vnode = values.vnode->next;
12503 mpz_set (values.left, values.vnode->repeat);
12511 check_data_variable (gfc_data_variable *var, locus *where)
12517 ar_type mark = AR_UNKNOWN;
12519 mpz_t section_index[GFC_MAX_DIMENSIONS];
12525 if (gfc_resolve_expr (var->expr) == FAILURE)
12529 mpz_init_set_si (offset, 0);
12532 if (e->expr_type != EXPR_VARIABLE)
12533 gfc_internal_error ("check_data_variable(): Bad expression");
12535 sym = e->symtree->n.sym;
12537 if (sym->ns->is_block_data && !sym->attr.in_common)
12539 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
12540 sym->name, &sym->declared_at);
12543 if (e->ref == NULL && sym->as)
12545 gfc_error ("DATA array '%s' at %L must be specified in a previous"
12546 " declaration", sym->name, where);
12550 has_pointer = sym->attr.pointer;
12552 if (gfc_is_coindexed (e))
12554 gfc_error ("DATA element '%s' at %L cannot have a coindex", sym->name,
12559 for (ref = e->ref; ref; ref = ref->next)
12561 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
12565 && ref->type == REF_ARRAY
12566 && ref->u.ar.type != AR_FULL)
12568 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12569 "be a full array", sym->name, where);
12574 if (e->rank == 0 || has_pointer)
12576 mpz_init_set_ui (size, 1);
12583 /* Find the array section reference. */
12584 for (ref = e->ref; ref; ref = ref->next)
12586 if (ref->type != REF_ARRAY)
12588 if (ref->u.ar.type == AR_ELEMENT)
12594 /* Set marks according to the reference pattern. */
12595 switch (ref->u.ar.type)
12603 /* Get the start position of array section. */
12604 gfc_get_section_index (ar, section_index, &offset);
12609 gcc_unreachable ();
12612 if (gfc_array_size (e, &size) == FAILURE)
12614 gfc_error ("Nonconstant array section at %L in DATA statement",
12616 mpz_clear (offset);
12623 while (mpz_cmp_ui (size, 0) > 0)
12625 if (next_data_value () == FAILURE)
12627 gfc_error ("DATA statement at %L has more variables than values",
12633 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12637 /* If we have more than one element left in the repeat count,
12638 and we have more than one element left in the target variable,
12639 then create a range assignment. */
12640 /* FIXME: Only done for full arrays for now, since array sections
12642 if (mark == AR_FULL && ref && ref->next == NULL
12643 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12647 if (mpz_cmp (size, values.left) >= 0)
12649 mpz_init_set (range, values.left);
12650 mpz_sub (size, size, values.left);
12651 mpz_set_ui (values.left, 0);
12655 mpz_init_set (range, size);
12656 mpz_sub (values.left, values.left, size);
12657 mpz_set_ui (size, 0);
12660 t = gfc_assign_data_value_range (var->expr, values.vnode->expr,
12663 mpz_add (offset, offset, range);
12670 /* Assign initial value to symbol. */
12673 mpz_sub_ui (values.left, values.left, 1);
12674 mpz_sub_ui (size, size, 1);
12676 t = gfc_assign_data_value (var->expr, values.vnode->expr, offset);
12680 if (mark == AR_FULL)
12681 mpz_add_ui (offset, offset, 1);
12683 /* Modify the array section indexes and recalculate the offset
12684 for next element. */
12685 else if (mark == AR_SECTION)
12686 gfc_advance_section (section_index, ar, &offset);
12690 if (mark == AR_SECTION)
12692 for (i = 0; i < ar->dimen; i++)
12693 mpz_clear (section_index[i]);
12697 mpz_clear (offset);
12703 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12705 /* Iterate over a list of elements in a DATA statement. */
12708 traverse_data_list (gfc_data_variable *var, locus *where)
12711 iterator_stack frame;
12712 gfc_expr *e, *start, *end, *step;
12713 gfc_try retval = SUCCESS;
12715 mpz_init (frame.value);
12718 start = gfc_copy_expr (var->iter.start);
12719 end = gfc_copy_expr (var->iter.end);
12720 step = gfc_copy_expr (var->iter.step);
12722 if (gfc_simplify_expr (start, 1) == FAILURE
12723 || start->expr_type != EXPR_CONSTANT)
12725 gfc_error ("start of implied-do loop at %L could not be "
12726 "simplified to a constant value", &start->where);
12730 if (gfc_simplify_expr (end, 1) == FAILURE
12731 || end->expr_type != EXPR_CONSTANT)
12733 gfc_error ("end of implied-do loop at %L could not be "
12734 "simplified to a constant value", &start->where);
12738 if (gfc_simplify_expr (step, 1) == FAILURE
12739 || step->expr_type != EXPR_CONSTANT)
12741 gfc_error ("step of implied-do loop at %L could not be "
12742 "simplified to a constant value", &start->where);
12747 mpz_set (trip, end->value.integer);
12748 mpz_sub (trip, trip, start->value.integer);
12749 mpz_add (trip, trip, step->value.integer);
12751 mpz_div (trip, trip, step->value.integer);
12753 mpz_set (frame.value, start->value.integer);
12755 frame.prev = iter_stack;
12756 frame.variable = var->iter.var->symtree;
12757 iter_stack = &frame;
12759 while (mpz_cmp_ui (trip, 0) > 0)
12761 if (traverse_data_var (var->list, where) == FAILURE)
12767 e = gfc_copy_expr (var->expr);
12768 if (gfc_simplify_expr (e, 1) == FAILURE)
12775 mpz_add (frame.value, frame.value, step->value.integer);
12777 mpz_sub_ui (trip, trip, 1);
12781 mpz_clear (frame.value);
12784 gfc_free_expr (start);
12785 gfc_free_expr (end);
12786 gfc_free_expr (step);
12788 iter_stack = frame.prev;
12793 /* Type resolve variables in the variable list of a DATA statement. */
12796 traverse_data_var (gfc_data_variable *var, locus *where)
12800 for (; var; var = var->next)
12802 if (var->expr == NULL)
12803 t = traverse_data_list (var, where);
12805 t = check_data_variable (var, where);
12815 /* Resolve the expressions and iterators associated with a data statement.
12816 This is separate from the assignment checking because data lists should
12817 only be resolved once. */
12820 resolve_data_variables (gfc_data_variable *d)
12822 for (; d; d = d->next)
12824 if (d->list == NULL)
12826 if (gfc_resolve_expr (d->expr) == FAILURE)
12831 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12834 if (resolve_data_variables (d->list) == FAILURE)
12843 /* Resolve a single DATA statement. We implement this by storing a pointer to
12844 the value list into static variables, and then recursively traversing the
12845 variables list, expanding iterators and such. */
12848 resolve_data (gfc_data *d)
12851 if (resolve_data_variables (d->var) == FAILURE)
12854 values.vnode = d->value;
12855 if (d->value == NULL)
12856 mpz_set_ui (values.left, 0);
12858 mpz_set (values.left, d->value->repeat);
12860 if (traverse_data_var (d->var, &d->where) == FAILURE)
12863 /* At this point, we better not have any values left. */
12865 if (next_data_value () == SUCCESS)
12866 gfc_error ("DATA statement at %L has more values than variables",
12871 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12872 accessed by host or use association, is a dummy argument to a pure function,
12873 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12874 is storage associated with any such variable, shall not be used in the
12875 following contexts: (clients of this function). */
12877 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12878 procedure. Returns zero if assignment is OK, nonzero if there is a
12881 gfc_impure_variable (gfc_symbol *sym)
12886 if (sym->attr.use_assoc || sym->attr.in_common)
12889 /* Check if the symbol's ns is inside the pure procedure. */
12890 for (ns = gfc_current_ns; ns; ns = ns->parent)
12894 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12898 proc = sym->ns->proc_name;
12899 if (sym->attr.dummy && gfc_pure (proc)
12900 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12902 proc->attr.function))
12905 /* TODO: Sort out what can be storage associated, if anything, and include
12906 it here. In principle equivalences should be scanned but it does not
12907 seem to be possible to storage associate an impure variable this way. */
12912 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12913 current namespace is inside a pure procedure. */
12916 gfc_pure (gfc_symbol *sym)
12918 symbol_attribute attr;
12923 /* Check if the current namespace or one of its parents
12924 belongs to a pure procedure. */
12925 for (ns = gfc_current_ns; ns; ns = ns->parent)
12927 sym = ns->proc_name;
12931 if (attr.flavor == FL_PROCEDURE && attr.pure)
12939 return attr.flavor == FL_PROCEDURE && attr.pure;
12943 /* Test whether a symbol is implicitly pure or not. For a NULL pointer,
12944 checks if the current namespace is implicitly pure. Note that this
12945 function returns false for a PURE procedure. */
12948 gfc_implicit_pure (gfc_symbol *sym)
12950 symbol_attribute attr;
12954 /* Check if the current namespace is implicit_pure. */
12955 sym = gfc_current_ns->proc_name;
12959 if (attr.flavor == FL_PROCEDURE
12960 && attr.implicit_pure && !attr.pure)
12967 return attr.flavor == FL_PROCEDURE && attr.implicit_pure && !attr.pure;
12971 /* Test whether the current procedure is elemental or not. */
12974 gfc_elemental (gfc_symbol *sym)
12976 symbol_attribute attr;
12979 sym = gfc_current_ns->proc_name;
12984 return attr.flavor == FL_PROCEDURE && attr.elemental;
12988 /* Warn about unused labels. */
12991 warn_unused_fortran_label (gfc_st_label *label)
12996 warn_unused_fortran_label (label->left);
12998 if (label->defined == ST_LABEL_UNKNOWN)
13001 switch (label->referenced)
13003 case ST_LABEL_UNKNOWN:
13004 gfc_warning ("Label %d at %L defined but not used", label->value,
13008 case ST_LABEL_BAD_TARGET:
13009 gfc_warning ("Label %d at %L defined but cannot be used",
13010 label->value, &label->where);
13017 warn_unused_fortran_label (label->right);
13021 /* Returns the sequence type of a symbol or sequence. */
13024 sequence_type (gfc_typespec ts)
13033 if (ts.u.derived->components == NULL)
13034 return SEQ_NONDEFAULT;
13036 result = sequence_type (ts.u.derived->components->ts);
13037 for (c = ts.u.derived->components->next; c; c = c->next)
13038 if (sequence_type (c->ts) != result)
13044 if (ts.kind != gfc_default_character_kind)
13045 return SEQ_NONDEFAULT;
13047 return SEQ_CHARACTER;
13050 if (ts.kind != gfc_default_integer_kind)
13051 return SEQ_NONDEFAULT;
13053 return SEQ_NUMERIC;
13056 if (!(ts.kind == gfc_default_real_kind
13057 || ts.kind == gfc_default_double_kind))
13058 return SEQ_NONDEFAULT;
13060 return SEQ_NUMERIC;
13063 if (ts.kind != gfc_default_complex_kind)
13064 return SEQ_NONDEFAULT;
13066 return SEQ_NUMERIC;
13069 if (ts.kind != gfc_default_logical_kind)
13070 return SEQ_NONDEFAULT;
13072 return SEQ_NUMERIC;
13075 return SEQ_NONDEFAULT;
13080 /* Resolve derived type EQUIVALENCE object. */
13083 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
13085 gfc_component *c = derived->components;
13090 /* Shall not be an object of nonsequence derived type. */
13091 if (!derived->attr.sequence)
13093 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
13094 "attribute to be an EQUIVALENCE object", sym->name,
13099 /* Shall not have allocatable components. */
13100 if (derived->attr.alloc_comp)
13102 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
13103 "components to be an EQUIVALENCE object",sym->name,
13108 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
13110 gfc_error ("Derived type variable '%s' at %L with default "
13111 "initialization cannot be in EQUIVALENCE with a variable "
13112 "in COMMON", sym->name, &e->where);
13116 for (; c ; c = c->next)
13118 if (c->ts.type == BT_DERIVED
13119 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
13122 /* Shall not be an object of sequence derived type containing a pointer
13123 in the structure. */
13124 if (c->attr.pointer)
13126 gfc_error ("Derived type variable '%s' at %L with pointer "
13127 "component(s) cannot be an EQUIVALENCE object",
13128 sym->name, &e->where);
13136 /* Resolve equivalence object.
13137 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
13138 an allocatable array, an object of nonsequence derived type, an object of
13139 sequence derived type containing a pointer at any level of component
13140 selection, an automatic object, a function name, an entry name, a result
13141 name, a named constant, a structure component, or a subobject of any of
13142 the preceding objects. A substring shall not have length zero. A
13143 derived type shall not have components with default initialization nor
13144 shall two objects of an equivalence group be initialized.
13145 Either all or none of the objects shall have an protected attribute.
13146 The simple constraints are done in symbol.c(check_conflict) and the rest
13147 are implemented here. */
13150 resolve_equivalence (gfc_equiv *eq)
13153 gfc_symbol *first_sym;
13156 locus *last_where = NULL;
13157 seq_type eq_type, last_eq_type;
13158 gfc_typespec *last_ts;
13159 int object, cnt_protected;
13162 last_ts = &eq->expr->symtree->n.sym->ts;
13164 first_sym = eq->expr->symtree->n.sym;
13168 for (object = 1; eq; eq = eq->eq, object++)
13172 e->ts = e->symtree->n.sym->ts;
13173 /* match_varspec might not know yet if it is seeing
13174 array reference or substring reference, as it doesn't
13176 if (e->ref && e->ref->type == REF_ARRAY)
13178 gfc_ref *ref = e->ref;
13179 sym = e->symtree->n.sym;
13181 if (sym->attr.dimension)
13183 ref->u.ar.as = sym->as;
13187 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
13188 if (e->ts.type == BT_CHARACTER
13190 && ref->type == REF_ARRAY
13191 && ref->u.ar.dimen == 1
13192 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
13193 && ref->u.ar.stride[0] == NULL)
13195 gfc_expr *start = ref->u.ar.start[0];
13196 gfc_expr *end = ref->u.ar.end[0];
13199 /* Optimize away the (:) reference. */
13200 if (start == NULL && end == NULL)
13203 e->ref = ref->next;
13205 e->ref->next = ref->next;
13210 ref->type = REF_SUBSTRING;
13212 start = gfc_get_int_expr (gfc_default_integer_kind,
13214 ref->u.ss.start = start;
13215 if (end == NULL && e->ts.u.cl)
13216 end = gfc_copy_expr (e->ts.u.cl->length);
13217 ref->u.ss.end = end;
13218 ref->u.ss.length = e->ts.u.cl;
13225 /* Any further ref is an error. */
13228 gcc_assert (ref->type == REF_ARRAY);
13229 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
13235 if (gfc_resolve_expr (e) == FAILURE)
13238 sym = e->symtree->n.sym;
13240 if (sym->attr.is_protected)
13242 if (cnt_protected > 0 && cnt_protected != object)
13244 gfc_error ("Either all or none of the objects in the "
13245 "EQUIVALENCE set at %L shall have the "
13246 "PROTECTED attribute",
13251 /* Shall not equivalence common block variables in a PURE procedure. */
13252 if (sym->ns->proc_name
13253 && sym->ns->proc_name->attr.pure
13254 && sym->attr.in_common)
13256 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
13257 "object in the pure procedure '%s'",
13258 sym->name, &e->where, sym->ns->proc_name->name);
13262 /* Shall not be a named constant. */
13263 if (e->expr_type == EXPR_CONSTANT)
13265 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
13266 "object", sym->name, &e->where);
13270 if (e->ts.type == BT_DERIVED
13271 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
13274 /* Check that the types correspond correctly:
13276 A numeric sequence structure may be equivalenced to another sequence
13277 structure, an object of default integer type, default real type, double
13278 precision real type, default logical type such that components of the
13279 structure ultimately only become associated to objects of the same
13280 kind. A character sequence structure may be equivalenced to an object
13281 of default character kind or another character sequence structure.
13282 Other objects may be equivalenced only to objects of the same type and
13283 kind parameters. */
13285 /* Identical types are unconditionally OK. */
13286 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
13287 goto identical_types;
13289 last_eq_type = sequence_type (*last_ts);
13290 eq_type = sequence_type (sym->ts);
13292 /* Since the pair of objects is not of the same type, mixed or
13293 non-default sequences can be rejected. */
13295 msg = "Sequence %s with mixed components in EQUIVALENCE "
13296 "statement at %L with different type objects";
13298 && last_eq_type == SEQ_MIXED
13299 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
13301 || (eq_type == SEQ_MIXED
13302 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13303 &e->where) == FAILURE))
13306 msg = "Non-default type object or sequence %s in EQUIVALENCE "
13307 "statement at %L with objects of different type";
13309 && last_eq_type == SEQ_NONDEFAULT
13310 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
13311 last_where) == FAILURE)
13312 || (eq_type == SEQ_NONDEFAULT
13313 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13314 &e->where) == FAILURE))
13317 msg ="Non-CHARACTER object '%s' in default CHARACTER "
13318 "EQUIVALENCE statement at %L";
13319 if (last_eq_type == SEQ_CHARACTER
13320 && eq_type != SEQ_CHARACTER
13321 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13322 &e->where) == FAILURE)
13325 msg ="Non-NUMERIC object '%s' in default NUMERIC "
13326 "EQUIVALENCE statement at %L";
13327 if (last_eq_type == SEQ_NUMERIC
13328 && eq_type != SEQ_NUMERIC
13329 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13330 &e->where) == FAILURE)
13335 last_where = &e->where;
13340 /* Shall not be an automatic array. */
13341 if (e->ref->type == REF_ARRAY
13342 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
13344 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
13345 "an EQUIVALENCE object", sym->name, &e->where);
13352 /* Shall not be a structure component. */
13353 if (r->type == REF_COMPONENT)
13355 gfc_error ("Structure component '%s' at %L cannot be an "
13356 "EQUIVALENCE object",
13357 r->u.c.component->name, &e->where);
13361 /* A substring shall not have length zero. */
13362 if (r->type == REF_SUBSTRING)
13364 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
13366 gfc_error ("Substring at %L has length zero",
13367 &r->u.ss.start->where);
13377 /* Resolve function and ENTRY types, issue diagnostics if needed. */
13380 resolve_fntype (gfc_namespace *ns)
13382 gfc_entry_list *el;
13385 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
13388 /* If there are any entries, ns->proc_name is the entry master
13389 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
13391 sym = ns->entries->sym;
13393 sym = ns->proc_name;
13394 if (sym->result == sym
13395 && sym->ts.type == BT_UNKNOWN
13396 && gfc_set_default_type (sym, 0, NULL) == FAILURE
13397 && !sym->attr.untyped)
13399 gfc_error ("Function '%s' at %L has no IMPLICIT type",
13400 sym->name, &sym->declared_at);
13401 sym->attr.untyped = 1;
13404 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
13405 && !sym->attr.contained
13406 && !gfc_check_symbol_access (sym->ts.u.derived)
13407 && gfc_check_symbol_access (sym))
13409 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
13410 "%L of PRIVATE type '%s'", sym->name,
13411 &sym->declared_at, sym->ts.u.derived->name);
13415 for (el = ns->entries->next; el; el = el->next)
13417 if (el->sym->result == el->sym
13418 && el->sym->ts.type == BT_UNKNOWN
13419 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
13420 && !el->sym->attr.untyped)
13422 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
13423 el->sym->name, &el->sym->declared_at);
13424 el->sym->attr.untyped = 1;
13430 /* 12.3.2.1.1 Defined operators. */
13433 check_uop_procedure (gfc_symbol *sym, locus where)
13435 gfc_formal_arglist *formal;
13437 if (!sym->attr.function)
13439 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
13440 sym->name, &where);
13444 if (sym->ts.type == BT_CHARACTER
13445 && !(sym->ts.u.cl && sym->ts.u.cl->length)
13446 && !(sym->result && sym->result->ts.u.cl
13447 && sym->result->ts.u.cl->length))
13449 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
13450 "character length", sym->name, &where);
13454 formal = sym->formal;
13455 if (!formal || !formal->sym)
13457 gfc_error ("User operator procedure '%s' at %L must have at least "
13458 "one argument", sym->name, &where);
13462 if (formal->sym->attr.intent != INTENT_IN)
13464 gfc_error ("First argument of operator interface at %L must be "
13465 "INTENT(IN)", &where);
13469 if (formal->sym->attr.optional)
13471 gfc_error ("First argument of operator interface at %L cannot be "
13472 "optional", &where);
13476 formal = formal->next;
13477 if (!formal || !formal->sym)
13480 if (formal->sym->attr.intent != INTENT_IN)
13482 gfc_error ("Second argument of operator interface at %L must be "
13483 "INTENT(IN)", &where);
13487 if (formal->sym->attr.optional)
13489 gfc_error ("Second argument of operator interface at %L cannot be "
13490 "optional", &where);
13496 gfc_error ("Operator interface at %L must have, at most, two "
13497 "arguments", &where);
13505 gfc_resolve_uops (gfc_symtree *symtree)
13507 gfc_interface *itr;
13509 if (symtree == NULL)
13512 gfc_resolve_uops (symtree->left);
13513 gfc_resolve_uops (symtree->right);
13515 for (itr = symtree->n.uop->op; itr; itr = itr->next)
13516 check_uop_procedure (itr->sym, itr->sym->declared_at);
13520 /* Examine all of the expressions associated with a program unit,
13521 assign types to all intermediate expressions, make sure that all
13522 assignments are to compatible types and figure out which names
13523 refer to which functions or subroutines. It doesn't check code
13524 block, which is handled by resolve_code. */
13527 resolve_types (gfc_namespace *ns)
13533 gfc_namespace* old_ns = gfc_current_ns;
13535 /* Check that all IMPLICIT types are ok. */
13536 if (!ns->seen_implicit_none)
13539 for (letter = 0; letter != GFC_LETTERS; ++letter)
13540 if (ns->set_flag[letter]
13541 && resolve_typespec_used (&ns->default_type[letter],
13542 &ns->implicit_loc[letter],
13547 gfc_current_ns = ns;
13549 resolve_entries (ns);
13551 resolve_common_vars (ns->blank_common.head, false);
13552 resolve_common_blocks (ns->common_root);
13554 resolve_contained_functions (ns);
13556 if (ns->proc_name && ns->proc_name->attr.flavor == FL_PROCEDURE
13557 && ns->proc_name->attr.if_source == IFSRC_IFBODY)
13558 resolve_formal_arglist (ns->proc_name);
13560 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
13562 for (cl = ns->cl_list; cl; cl = cl->next)
13563 resolve_charlen (cl);
13565 gfc_traverse_ns (ns, resolve_symbol);
13567 resolve_fntype (ns);
13569 for (n = ns->contained; n; n = n->sibling)
13571 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
13572 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
13573 "also be PURE", n->proc_name->name,
13574 &n->proc_name->declared_at);
13580 gfc_check_interfaces (ns);
13582 gfc_traverse_ns (ns, resolve_values);
13588 for (d = ns->data; d; d = d->next)
13592 gfc_traverse_ns (ns, gfc_formalize_init_value);
13594 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13596 if (ns->common_root != NULL)
13597 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13599 for (eq = ns->equiv; eq; eq = eq->next)
13600 resolve_equivalence (eq);
13602 /* Warn about unused labels. */
13603 if (warn_unused_label)
13604 warn_unused_fortran_label (ns->st_labels);
13606 gfc_resolve_uops (ns->uop_root);
13608 gfc_current_ns = old_ns;
13612 /* Call resolve_code recursively. */
13615 resolve_codes (gfc_namespace *ns)
13618 bitmap_obstack old_obstack;
13620 if (ns->resolved == 1)
13623 for (n = ns->contained; n; n = n->sibling)
13626 gfc_current_ns = ns;
13628 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13629 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13632 /* Set to an out of range value. */
13633 current_entry_id = -1;
13635 old_obstack = labels_obstack;
13636 bitmap_obstack_initialize (&labels_obstack);
13638 resolve_code (ns->code, ns);
13640 bitmap_obstack_release (&labels_obstack);
13641 labels_obstack = old_obstack;
13645 /* This function is called after a complete program unit has been compiled.
13646 Its purpose is to examine all of the expressions associated with a program
13647 unit, assign types to all intermediate expressions, make sure that all
13648 assignments are to compatible types and figure out which names refer to
13649 which functions or subroutines. */
13652 gfc_resolve (gfc_namespace *ns)
13654 gfc_namespace *old_ns;
13655 code_stack *old_cs_base;
13661 old_ns = gfc_current_ns;
13662 old_cs_base = cs_base;
13664 resolve_types (ns);
13665 resolve_codes (ns);
13667 gfc_current_ns = old_ns;
13668 cs_base = old_cs_base;
13671 gfc_run_passes (ns);