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 or DO CONCURRENT block. */
63 static int forall_flag;
64 static int do_concurrent_flag;
66 /* Nonzero if we're inside a OpenMP WORKSHARE or PARALLEL WORKSHARE block. */
68 static int omp_workshare_flag;
70 /* Nonzero if we are processing a formal arglist. The corresponding function
71 resets the flag each time that it is read. */
72 static int formal_arg_flag = 0;
74 /* True if we are resolving a specification expression. */
75 static int specification_expr = 0;
77 /* The id of the last entry seen. */
78 static int current_entry_id;
80 /* We use bitmaps to determine if a branch target is valid. */
81 static bitmap_obstack labels_obstack;
83 /* True when simplifying a EXPR_VARIABLE argument to an inquiry function. */
84 static bool inquiry_argument = false;
87 gfc_is_formal_arg (void)
89 return formal_arg_flag;
92 /* Is the symbol host associated? */
94 is_sym_host_assoc (gfc_symbol *sym, gfc_namespace *ns)
96 for (ns = ns->parent; ns; ns = ns->parent)
105 /* Ensure a typespec used is valid; for instance, TYPE(t) is invalid if t is
106 an ABSTRACT derived-type. If where is not NULL, an error message with that
107 locus is printed, optionally using name. */
110 resolve_typespec_used (gfc_typespec* ts, locus* where, const char* name)
112 if (ts->type == BT_DERIVED && ts->u.derived->attr.abstract)
117 gfc_error ("'%s' at %L is of the ABSTRACT type '%s'",
118 name, where, ts->u.derived->name);
120 gfc_error ("ABSTRACT type '%s' used at %L",
121 ts->u.derived->name, where);
131 static void resolve_symbol (gfc_symbol *sym);
132 static gfc_try resolve_intrinsic (gfc_symbol *sym, locus *loc);
135 /* Resolve the interface for a PROCEDURE declaration or procedure pointer. */
138 resolve_procedure_interface (gfc_symbol *sym)
140 if (sym->ts.interface == sym)
142 gfc_error ("PROCEDURE '%s' at %L may not be used as its own interface",
143 sym->name, &sym->declared_at);
146 if (sym->ts.interface->attr.procedure)
148 gfc_error ("Interface '%s', used by procedure '%s' at %L, is declared "
149 "in a later PROCEDURE statement", sym->ts.interface->name,
150 sym->name, &sym->declared_at);
154 /* Get the attributes from the interface (now resolved). */
155 if (sym->ts.interface->attr.if_source || sym->ts.interface->attr.intrinsic)
157 gfc_symbol *ifc = sym->ts.interface;
158 resolve_symbol (ifc);
160 if (ifc->attr.intrinsic)
161 resolve_intrinsic (ifc, &ifc->declared_at);
165 sym->ts = ifc->result->ts;
170 sym->ts.interface = ifc;
171 sym->attr.function = ifc->attr.function;
172 sym->attr.subroutine = ifc->attr.subroutine;
173 gfc_copy_formal_args (sym, ifc);
175 sym->attr.allocatable = ifc->attr.allocatable;
176 sym->attr.pointer = ifc->attr.pointer;
177 sym->attr.pure = ifc->attr.pure;
178 sym->attr.elemental = ifc->attr.elemental;
179 sym->attr.dimension = ifc->attr.dimension;
180 sym->attr.contiguous = ifc->attr.contiguous;
181 sym->attr.recursive = ifc->attr.recursive;
182 sym->attr.always_explicit = ifc->attr.always_explicit;
183 sym->attr.ext_attr |= ifc->attr.ext_attr;
184 sym->attr.is_bind_c = ifc->attr.is_bind_c;
185 /* Copy array spec. */
186 sym->as = gfc_copy_array_spec (ifc->as);
190 for (i = 0; i < sym->as->rank; i++)
192 gfc_expr_replace_symbols (sym->as->lower[i], sym);
193 gfc_expr_replace_symbols (sym->as->upper[i], sym);
196 /* Copy char length. */
197 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
199 sym->ts.u.cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
200 gfc_expr_replace_symbols (sym->ts.u.cl->length, sym);
201 if (sym->ts.u.cl->length && !sym->ts.u.cl->resolved
202 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
206 else if (sym->ts.interface->name[0] != '\0')
208 gfc_error ("Interface '%s' of procedure '%s' at %L must be explicit",
209 sym->ts.interface->name, sym->name, &sym->declared_at);
217 /* Resolve types of formal argument lists. These have to be done early so that
218 the formal argument lists of module procedures can be copied to the
219 containing module before the individual procedures are resolved
220 individually. We also resolve argument lists of procedures in interface
221 blocks because they are self-contained scoping units.
223 Since a dummy argument cannot be a non-dummy procedure, the only
224 resort left for untyped names are the IMPLICIT types. */
227 resolve_formal_arglist (gfc_symbol *proc)
229 gfc_formal_arglist *f;
233 if (proc->result != NULL)
238 if (gfc_elemental (proc)
239 || sym->attr.pointer || sym->attr.allocatable
240 || (sym->as && sym->as->rank > 0))
242 proc->attr.always_explicit = 1;
243 sym->attr.always_explicit = 1;
248 for (f = proc->formal; f; f = f->next)
254 /* Alternate return placeholder. */
255 if (gfc_elemental (proc))
256 gfc_error ("Alternate return specifier in elemental subroutine "
257 "'%s' at %L is not allowed", proc->name,
259 if (proc->attr.function)
260 gfc_error ("Alternate return specifier in function "
261 "'%s' at %L is not allowed", proc->name,
265 else if (sym->attr.procedure && sym->ts.interface
266 && sym->attr.if_source != IFSRC_DECL)
267 resolve_procedure_interface (sym);
269 if (sym->attr.if_source != IFSRC_UNKNOWN)
270 resolve_formal_arglist (sym);
272 if (sym->attr.subroutine || sym->attr.external)
274 if (sym->attr.flavor == FL_UNKNOWN)
275 gfc_add_flavor (&sym->attr, FL_PROCEDURE, sym->name, &sym->declared_at);
279 if (sym->ts.type == BT_UNKNOWN && !proc->attr.intrinsic
280 && (!sym->attr.function || sym->result == sym))
281 gfc_set_default_type (sym, 1, sym->ns);
284 gfc_resolve_array_spec (sym->as, 0);
286 /* We can't tell if an array with dimension (:) is assumed or deferred
287 shape until we know if it has the pointer or allocatable attributes.
289 if (sym->as && sym->as->rank > 0 && sym->as->type == AS_DEFERRED
290 && !(sym->attr.pointer || sym->attr.allocatable)
291 && sym->attr.flavor != FL_PROCEDURE)
293 sym->as->type = AS_ASSUMED_SHAPE;
294 for (i = 0; i < sym->as->rank; i++)
295 sym->as->lower[i] = gfc_get_int_expr (gfc_default_integer_kind,
299 if ((sym->as && sym->as->rank > 0 && sym->as->type == AS_ASSUMED_SHAPE)
300 || sym->attr.pointer || sym->attr.allocatable || sym->attr.target
301 || sym->attr.optional)
303 proc->attr.always_explicit = 1;
305 proc->result->attr.always_explicit = 1;
308 /* If the flavor is unknown at this point, it has to be a variable.
309 A procedure specification would have already set the type. */
311 if (sym->attr.flavor == FL_UNKNOWN)
312 gfc_add_flavor (&sym->attr, FL_VARIABLE, sym->name, &sym->declared_at);
316 if (sym->attr.flavor == FL_PROCEDURE)
321 gfc_error ("Dummy procedure '%s' of PURE procedure at %L must "
322 "also be PURE", sym->name, &sym->declared_at);
326 else if (!sym->attr.pointer)
328 if (proc->attr.function && sym->attr.intent != INTENT_IN)
331 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s'"
332 " of pure function '%s' at %L with VALUE "
333 "attribute but without INTENT(IN)",
334 sym->name, proc->name, &sym->declared_at);
336 gfc_error ("Argument '%s' of pure function '%s' at %L must "
337 "be INTENT(IN) or VALUE", sym->name, proc->name,
341 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
344 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Argument '%s'"
345 " of pure subroutine '%s' at %L with VALUE "
346 "attribute but without INTENT", sym->name,
347 proc->name, &sym->declared_at);
349 gfc_error ("Argument '%s' of pure subroutine '%s' at %L "
350 "must have its INTENT specified or have the "
351 "VALUE attribute", sym->name, proc->name,
357 if (proc->attr.implicit_pure)
359 if (sym->attr.flavor == FL_PROCEDURE)
362 proc->attr.implicit_pure = 0;
364 else if (!sym->attr.pointer)
366 if (proc->attr.function && sym->attr.intent != INTENT_IN)
367 proc->attr.implicit_pure = 0;
369 if (proc->attr.subroutine && sym->attr.intent == INTENT_UNKNOWN)
370 proc->attr.implicit_pure = 0;
374 if (gfc_elemental (proc))
377 if (sym->attr.codimension)
379 gfc_error ("Coarray dummy argument '%s' at %L to elemental "
380 "procedure", sym->name, &sym->declared_at);
386 gfc_error ("Argument '%s' of elemental procedure at %L must "
387 "be scalar", sym->name, &sym->declared_at);
391 if (sym->attr.allocatable)
393 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
394 "have the ALLOCATABLE attribute", sym->name,
399 if (sym->attr.pointer)
401 gfc_error ("Argument '%s' of elemental procedure at %L cannot "
402 "have the POINTER attribute", sym->name,
407 if (sym->attr.flavor == FL_PROCEDURE)
409 gfc_error ("Dummy procedure '%s' not allowed in elemental "
410 "procedure '%s' at %L", sym->name, proc->name,
415 if (sym->attr.intent == INTENT_UNKNOWN)
417 gfc_error ("Argument '%s' of elemental procedure '%s' at %L must "
418 "have its INTENT specified", sym->name, proc->name,
424 /* Each dummy shall be specified to be scalar. */
425 if (proc->attr.proc == PROC_ST_FUNCTION)
429 gfc_error ("Argument '%s' of statement function at %L must "
430 "be scalar", sym->name, &sym->declared_at);
434 if (sym->ts.type == BT_CHARACTER)
436 gfc_charlen *cl = sym->ts.u.cl;
437 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
439 gfc_error ("Character-valued argument '%s' of statement "
440 "function at %L must have constant length",
441 sym->name, &sym->declared_at);
451 /* Work function called when searching for symbols that have argument lists
452 associated with them. */
455 find_arglists (gfc_symbol *sym)
457 if (sym->attr.if_source == IFSRC_UNKNOWN || sym->ns != gfc_current_ns)
460 resolve_formal_arglist (sym);
464 /* Given a namespace, resolve all formal argument lists within the namespace.
468 resolve_formal_arglists (gfc_namespace *ns)
473 gfc_traverse_ns (ns, find_arglists);
478 resolve_contained_fntype (gfc_symbol *sym, gfc_namespace *ns)
482 /* If this namespace is not a function or an entry master function,
484 if (! sym || !(sym->attr.function || sym->attr.flavor == FL_VARIABLE)
485 || sym->attr.entry_master)
488 /* Try to find out of what the return type is. */
489 if (sym->result->ts.type == BT_UNKNOWN && sym->result->ts.interface == NULL)
491 t = gfc_set_default_type (sym->result, 0, ns);
493 if (t == FAILURE && !sym->result->attr.untyped)
495 if (sym->result == sym)
496 gfc_error ("Contained function '%s' at %L has no IMPLICIT type",
497 sym->name, &sym->declared_at);
498 else if (!sym->result->attr.proc_pointer)
499 gfc_error ("Result '%s' of contained function '%s' at %L has "
500 "no IMPLICIT type", sym->result->name, sym->name,
501 &sym->result->declared_at);
502 sym->result->attr.untyped = 1;
506 /* Fortran 95 Draft Standard, page 51, Section 5.1.1.5, on the Character
507 type, lists the only ways a character length value of * can be used:
508 dummy arguments of procedures, named constants, and function results
509 in external functions. Internal function results and results of module
510 procedures are not on this list, ergo, not permitted. */
512 if (sym->result->ts.type == BT_CHARACTER)
514 gfc_charlen *cl = sym->result->ts.u.cl;
515 if ((!cl || !cl->length) && !sym->result->ts.deferred)
517 /* See if this is a module-procedure and adapt error message
520 gcc_assert (ns->parent && ns->parent->proc_name);
521 module_proc = (ns->parent->proc_name->attr.flavor == FL_MODULE);
523 gfc_error ("Character-valued %s '%s' at %L must not be"
525 module_proc ? _("module procedure")
526 : _("internal function"),
527 sym->name, &sym->declared_at);
533 /* Add NEW_ARGS to the formal argument list of PROC, taking care not to
534 introduce duplicates. */
537 merge_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
539 gfc_formal_arglist *f, *new_arglist;
542 for (; new_args != NULL; new_args = new_args->next)
544 new_sym = new_args->sym;
545 /* See if this arg is already in the formal argument list. */
546 for (f = proc->formal; f; f = f->next)
548 if (new_sym == f->sym)
555 /* Add a new argument. Argument order is not important. */
556 new_arglist = gfc_get_formal_arglist ();
557 new_arglist->sym = new_sym;
558 new_arglist->next = proc->formal;
559 proc->formal = new_arglist;
564 /* Flag the arguments that are not present in all entries. */
567 check_argument_lists (gfc_symbol *proc, gfc_formal_arglist *new_args)
569 gfc_formal_arglist *f, *head;
572 for (f = proc->formal; f; f = f->next)
577 for (new_args = head; new_args; new_args = new_args->next)
579 if (new_args->sym == f->sym)
586 f->sym->attr.not_always_present = 1;
591 /* Resolve alternate entry points. If a symbol has multiple entry points we
592 create a new master symbol for the main routine, and turn the existing
593 symbol into an entry point. */
596 resolve_entries (gfc_namespace *ns)
598 gfc_namespace *old_ns;
602 char name[GFC_MAX_SYMBOL_LEN + 1];
603 static int master_count = 0;
605 if (ns->proc_name == NULL)
608 /* No need to do anything if this procedure doesn't have alternate entry
613 /* We may already have resolved alternate entry points. */
614 if (ns->proc_name->attr.entry_master)
617 /* If this isn't a procedure something has gone horribly wrong. */
618 gcc_assert (ns->proc_name->attr.flavor == FL_PROCEDURE);
620 /* Remember the current namespace. */
621 old_ns = gfc_current_ns;
625 /* Add the main entry point to the list of entry points. */
626 el = gfc_get_entry_list ();
627 el->sym = ns->proc_name;
629 el->next = ns->entries;
631 ns->proc_name->attr.entry = 1;
633 /* If it is a module function, it needs to be in the right namespace
634 so that gfc_get_fake_result_decl can gather up the results. The
635 need for this arose in get_proc_name, where these beasts were
636 left in their own namespace, to keep prior references linked to
637 the entry declaration.*/
638 if (ns->proc_name->attr.function
639 && ns->parent && ns->parent->proc_name->attr.flavor == FL_MODULE)
642 /* Do the same for entries where the master is not a module
643 procedure. These are retained in the module namespace because
644 of the module procedure declaration. */
645 for (el = el->next; el; el = el->next)
646 if (el->sym->ns->proc_name->attr.flavor == FL_MODULE
647 && el->sym->attr.mod_proc)
651 /* Add an entry statement for it. */
658 /* Create a new symbol for the master function. */
659 /* Give the internal function a unique name (within this file).
660 Also include the function name so the user has some hope of figuring
661 out what is going on. */
662 snprintf (name, GFC_MAX_SYMBOL_LEN, "master.%d.%s",
663 master_count++, ns->proc_name->name);
664 gfc_get_ha_symbol (name, &proc);
665 gcc_assert (proc != NULL);
667 gfc_add_procedure (&proc->attr, PROC_INTERNAL, proc->name, NULL);
668 if (ns->proc_name->attr.subroutine)
669 gfc_add_subroutine (&proc->attr, proc->name, NULL);
673 gfc_typespec *ts, *fts;
674 gfc_array_spec *as, *fas;
675 gfc_add_function (&proc->attr, proc->name, NULL);
677 fas = ns->entries->sym->as;
678 fas = fas ? fas : ns->entries->sym->result->as;
679 fts = &ns->entries->sym->result->ts;
680 if (fts->type == BT_UNKNOWN)
681 fts = gfc_get_default_type (ns->entries->sym->result->name, NULL);
682 for (el = ns->entries->next; el; el = el->next)
684 ts = &el->sym->result->ts;
686 as = as ? as : el->sym->result->as;
687 if (ts->type == BT_UNKNOWN)
688 ts = gfc_get_default_type (el->sym->result->name, NULL);
690 if (! gfc_compare_types (ts, fts)
691 || (el->sym->result->attr.dimension
692 != ns->entries->sym->result->attr.dimension)
693 || (el->sym->result->attr.pointer
694 != ns->entries->sym->result->attr.pointer))
696 else if (as && fas && ns->entries->sym->result != el->sym->result
697 && gfc_compare_array_spec (as, fas) == 0)
698 gfc_error ("Function %s at %L has entries with mismatched "
699 "array specifications", ns->entries->sym->name,
700 &ns->entries->sym->declared_at);
701 /* The characteristics need to match and thus both need to have
702 the same string length, i.e. both len=*, or both len=4.
703 Having both len=<variable> is also possible, but difficult to
704 check at compile time. */
705 else if (ts->type == BT_CHARACTER && ts->u.cl && fts->u.cl
706 && (((ts->u.cl->length && !fts->u.cl->length)
707 ||(!ts->u.cl->length && fts->u.cl->length))
709 && ts->u.cl->length->expr_type
710 != fts->u.cl->length->expr_type)
712 && ts->u.cl->length->expr_type == EXPR_CONSTANT
713 && mpz_cmp (ts->u.cl->length->value.integer,
714 fts->u.cl->length->value.integer) != 0)))
715 gfc_notify_std (GFC_STD_GNU, "Extension: Function %s at %L with "
716 "entries returning variables of different "
717 "string lengths", ns->entries->sym->name,
718 &ns->entries->sym->declared_at);
723 sym = ns->entries->sym->result;
724 /* All result types the same. */
726 if (sym->attr.dimension)
727 gfc_set_array_spec (proc, gfc_copy_array_spec (sym->as), NULL);
728 if (sym->attr.pointer)
729 gfc_add_pointer (&proc->attr, NULL);
733 /* Otherwise the result will be passed through a union by
735 proc->attr.mixed_entry_master = 1;
736 for (el = ns->entries; el; el = el->next)
738 sym = el->sym->result;
739 if (sym->attr.dimension)
741 if (el == ns->entries)
742 gfc_error ("FUNCTION result %s can't be an array in "
743 "FUNCTION %s at %L", sym->name,
744 ns->entries->sym->name, &sym->declared_at);
746 gfc_error ("ENTRY result %s can't be an array in "
747 "FUNCTION %s at %L", sym->name,
748 ns->entries->sym->name, &sym->declared_at);
750 else if (sym->attr.pointer)
752 if (el == ns->entries)
753 gfc_error ("FUNCTION result %s can't be a POINTER in "
754 "FUNCTION %s at %L", sym->name,
755 ns->entries->sym->name, &sym->declared_at);
757 gfc_error ("ENTRY result %s can't be a POINTER in "
758 "FUNCTION %s at %L", sym->name,
759 ns->entries->sym->name, &sym->declared_at);
764 if (ts->type == BT_UNKNOWN)
765 ts = gfc_get_default_type (sym->name, NULL);
769 if (ts->kind == gfc_default_integer_kind)
773 if (ts->kind == gfc_default_real_kind
774 || ts->kind == gfc_default_double_kind)
778 if (ts->kind == gfc_default_complex_kind)
782 if (ts->kind == gfc_default_logical_kind)
786 /* We will issue error elsewhere. */
794 if (el == ns->entries)
795 gfc_error ("FUNCTION result %s can't be of type %s "
796 "in FUNCTION %s at %L", sym->name,
797 gfc_typename (ts), ns->entries->sym->name,
800 gfc_error ("ENTRY result %s can't be of type %s "
801 "in FUNCTION %s at %L", sym->name,
802 gfc_typename (ts), ns->entries->sym->name,
809 proc->attr.access = ACCESS_PRIVATE;
810 proc->attr.entry_master = 1;
812 /* Merge all the entry point arguments. */
813 for (el = ns->entries; el; el = el->next)
814 merge_argument_lists (proc, el->sym->formal);
816 /* Check the master formal arguments for any that are not
817 present in all entry points. */
818 for (el = ns->entries; el; el = el->next)
819 check_argument_lists (proc, el->sym->formal);
821 /* Use the master function for the function body. */
822 ns->proc_name = proc;
824 /* Finalize the new symbols. */
825 gfc_commit_symbols ();
827 /* Restore the original namespace. */
828 gfc_current_ns = old_ns;
832 /* Resolve common variables. */
834 resolve_common_vars (gfc_symbol *sym, bool named_common)
836 gfc_symbol *csym = sym;
838 for (; csym; csym = csym->common_next)
840 if (csym->value || csym->attr.data)
842 if (!csym->ns->is_block_data)
843 gfc_notify_std (GFC_STD_GNU, "Variable '%s' at %L is in COMMON "
844 "but only in BLOCK DATA initialization is "
845 "allowed", csym->name, &csym->declared_at);
846 else if (!named_common)
847 gfc_notify_std (GFC_STD_GNU, "Initialized variable '%s' at %L is "
848 "in a blank COMMON but initialization is only "
849 "allowed in named common blocks", csym->name,
853 if (csym->ts.type != BT_DERIVED)
856 if (!(csym->ts.u.derived->attr.sequence
857 || csym->ts.u.derived->attr.is_bind_c))
858 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
859 "has neither the SEQUENCE nor the BIND(C) "
860 "attribute", csym->name, &csym->declared_at);
861 if (csym->ts.u.derived->attr.alloc_comp)
862 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
863 "has an ultimate component that is "
864 "allocatable", csym->name, &csym->declared_at);
865 if (gfc_has_default_initializer (csym->ts.u.derived))
866 gfc_error_now ("Derived type variable '%s' in COMMON at %L "
867 "may not have default initializer", csym->name,
870 if (csym->attr.flavor == FL_UNKNOWN && !csym->attr.proc_pointer)
871 gfc_add_flavor (&csym->attr, FL_VARIABLE, csym->name, &csym->declared_at);
875 /* Resolve common blocks. */
877 resolve_common_blocks (gfc_symtree *common_root)
881 if (common_root == NULL)
884 if (common_root->left)
885 resolve_common_blocks (common_root->left);
886 if (common_root->right)
887 resolve_common_blocks (common_root->right);
889 resolve_common_vars (common_root->n.common->head, true);
891 gfc_find_symbol (common_root->name, gfc_current_ns, 0, &sym);
895 if (sym->attr.flavor == FL_PARAMETER)
896 gfc_error ("COMMON block '%s' at %L is used as PARAMETER at %L",
897 sym->name, &common_root->n.common->where, &sym->declared_at);
899 if (sym->attr.external)
900 gfc_error ("COMMON block '%s' at %L can not have the EXTERNAL attribute",
901 sym->name, &common_root->n.common->where);
903 if (sym->attr.intrinsic)
904 gfc_error ("COMMON block '%s' at %L is also an intrinsic procedure",
905 sym->name, &common_root->n.common->where);
906 else if (sym->attr.result
907 || gfc_is_function_return_value (sym, gfc_current_ns))
908 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
909 "that is also a function result", sym->name,
910 &common_root->n.common->where);
911 else if (sym->attr.flavor == FL_PROCEDURE && sym->attr.proc != PROC_INTERNAL
912 && sym->attr.proc != PROC_ST_FUNCTION)
913 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: COMMON block '%s' at %L "
914 "that is also a global procedure", sym->name,
915 &common_root->n.common->where);
919 /* Resolve contained function types. Because contained functions can call one
920 another, they have to be worked out before any of the contained procedures
923 The good news is that if a function doesn't already have a type, the only
924 way it can get one is through an IMPLICIT type or a RESULT variable, because
925 by definition contained functions are contained namespace they're contained
926 in, not in a sibling or parent namespace. */
929 resolve_contained_functions (gfc_namespace *ns)
931 gfc_namespace *child;
934 resolve_formal_arglists (ns);
936 for (child = ns->contained; child; child = child->sibling)
938 /* Resolve alternate entry points first. */
939 resolve_entries (child);
941 /* Then check function return types. */
942 resolve_contained_fntype (child->proc_name, child);
943 for (el = child->entries; el; el = el->next)
944 resolve_contained_fntype (el->sym, child);
949 static gfc_try resolve_fl_derived0 (gfc_symbol *sym);
952 /* Resolve all of the elements of a structure constructor and make sure that
953 the types are correct. The 'init' flag indicates that the given
954 constructor is an initializer. */
957 resolve_structure_cons (gfc_expr *expr, int init)
959 gfc_constructor *cons;
966 if (expr->ts.type == BT_DERIVED)
967 resolve_fl_derived0 (expr->ts.u.derived);
969 cons = gfc_constructor_first (expr->value.constructor);
970 /* A constructor may have references if it is the result of substituting a
971 parameter variable. In this case we just pull out the component we
974 comp = expr->ref->u.c.sym->components;
976 comp = expr->ts.u.derived->components;
978 /* See if the user is trying to invoke a structure constructor for one of
979 the iso_c_binding derived types. */
980 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
981 && expr->ts.u.derived->ts.is_iso_c && cons
982 && (cons->expr == NULL || cons->expr->expr_type != EXPR_NULL))
984 gfc_error ("Components of structure constructor '%s' at %L are PRIVATE",
985 expr->ts.u.derived->name, &(expr->where));
989 /* Return if structure constructor is c_null_(fun)prt. */
990 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
991 && expr->ts.u.derived->ts.is_iso_c && cons
992 && cons->expr && cons->expr->expr_type == EXPR_NULL)
995 for (; comp && cons; comp = comp->next, cons = gfc_constructor_next (cons))
1002 if (gfc_resolve_expr (cons->expr) == FAILURE)
1008 rank = comp->as ? comp->as->rank : 0;
1009 if (cons->expr->expr_type != EXPR_NULL && rank != cons->expr->rank
1010 && (comp->attr.allocatable || cons->expr->rank))
1012 gfc_error ("The rank of the element in the structure "
1013 "constructor at %L does not match that of the "
1014 "component (%d/%d)", &cons->expr->where,
1015 cons->expr->rank, rank);
1019 /* If we don't have the right type, try to convert it. */
1021 if (!comp->attr.proc_pointer &&
1022 !gfc_compare_types (&cons->expr->ts, &comp->ts))
1025 if (strcmp (comp->name, "_extends") == 0)
1027 /* Can afford to be brutal with the _extends initializer.
1028 The derived type can get lost because it is PRIVATE
1029 but it is not usage constrained by the standard. */
1030 cons->expr->ts = comp->ts;
1033 else if (comp->attr.pointer && cons->expr->ts.type != BT_UNKNOWN)
1034 gfc_error ("The element in the structure constructor at %L, "
1035 "for pointer component '%s', is %s but should be %s",
1036 &cons->expr->where, comp->name,
1037 gfc_basic_typename (cons->expr->ts.type),
1038 gfc_basic_typename (comp->ts.type));
1040 t = gfc_convert_type (cons->expr, &comp->ts, 1);
1043 /* For strings, the length of the constructor should be the same as
1044 the one of the structure, ensure this if the lengths are known at
1045 compile time and when we are dealing with PARAMETER or structure
1047 if (cons->expr->ts.type == BT_CHARACTER && comp->ts.u.cl
1048 && comp->ts.u.cl->length
1049 && comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
1050 && cons->expr->ts.u.cl && cons->expr->ts.u.cl->length
1051 && cons->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
1052 && mpz_cmp (cons->expr->ts.u.cl->length->value.integer,
1053 comp->ts.u.cl->length->value.integer) != 0)
1055 if (cons->expr->expr_type == EXPR_VARIABLE
1056 && cons->expr->symtree->n.sym->attr.flavor == FL_PARAMETER)
1058 /* Wrap the parameter in an array constructor (EXPR_ARRAY)
1059 to make use of the gfc_resolve_character_array_constructor
1060 machinery. The expression is later simplified away to
1061 an array of string literals. */
1062 gfc_expr *para = cons->expr;
1063 cons->expr = gfc_get_expr ();
1064 cons->expr->ts = para->ts;
1065 cons->expr->where = para->where;
1066 cons->expr->expr_type = EXPR_ARRAY;
1067 cons->expr->rank = para->rank;
1068 cons->expr->shape = gfc_copy_shape (para->shape, para->rank);
1069 gfc_constructor_append_expr (&cons->expr->value.constructor,
1070 para, &cons->expr->where);
1072 if (cons->expr->expr_type == EXPR_ARRAY)
1075 p = gfc_constructor_first (cons->expr->value.constructor);
1076 if (cons->expr->ts.u.cl != p->expr->ts.u.cl)
1078 gfc_charlen *cl, *cl2;
1081 for (cl = gfc_current_ns->cl_list; cl; cl = cl->next)
1083 if (cl == cons->expr->ts.u.cl)
1091 cl2->next = cl->next;
1093 gfc_free_expr (cl->length);
1097 cons->expr->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
1098 cons->expr->ts.u.cl->length_from_typespec = true;
1099 cons->expr->ts.u.cl->length = gfc_copy_expr (comp->ts.u.cl->length);
1100 gfc_resolve_character_array_constructor (cons->expr);
1104 if (cons->expr->expr_type == EXPR_NULL
1105 && !(comp->attr.pointer || comp->attr.allocatable
1106 || comp->attr.proc_pointer
1107 || (comp->ts.type == BT_CLASS
1108 && (CLASS_DATA (comp)->attr.class_pointer
1109 || CLASS_DATA (comp)->attr.allocatable))))
1112 gfc_error ("The NULL in the structure constructor at %L is "
1113 "being applied to component '%s', which is neither "
1114 "a POINTER nor ALLOCATABLE", &cons->expr->where,
1118 if (comp->attr.proc_pointer && comp->ts.interface)
1120 /* Check procedure pointer interface. */
1121 gfc_symbol *s2 = NULL;
1126 if (gfc_is_proc_ptr_comp (cons->expr, &c2))
1128 s2 = c2->ts.interface;
1131 else if (cons->expr->expr_type == EXPR_FUNCTION)
1133 s2 = cons->expr->symtree->n.sym->result;
1134 name = cons->expr->symtree->n.sym->result->name;
1136 else if (cons->expr->expr_type != EXPR_NULL)
1138 s2 = cons->expr->symtree->n.sym;
1139 name = cons->expr->symtree->n.sym->name;
1142 if (s2 && !gfc_compare_interfaces (comp->ts.interface, s2, name, 0, 1,
1145 gfc_error ("Interface mismatch for procedure-pointer component "
1146 "'%s' in structure constructor at %L: %s",
1147 comp->name, &cons->expr->where, err);
1152 if (!comp->attr.pointer || comp->attr.proc_pointer
1153 || cons->expr->expr_type == EXPR_NULL)
1156 a = gfc_expr_attr (cons->expr);
1158 if (!a.pointer && !a.target)
1161 gfc_error ("The element in the structure constructor at %L, "
1162 "for pointer component '%s' should be a POINTER or "
1163 "a TARGET", &cons->expr->where, comp->name);
1168 /* F08:C461. Additional checks for pointer initialization. */
1172 gfc_error ("Pointer initialization target at %L "
1173 "must not be ALLOCATABLE ", &cons->expr->where);
1178 gfc_error ("Pointer initialization target at %L "
1179 "must have the SAVE attribute", &cons->expr->where);
1183 /* F2003, C1272 (3). */
1184 if (gfc_pure (NULL) && cons->expr->expr_type == EXPR_VARIABLE
1185 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1186 || gfc_is_coindexed (cons->expr)))
1189 gfc_error ("Invalid expression in the structure constructor for "
1190 "pointer component '%s' at %L in PURE procedure",
1191 comp->name, &cons->expr->where);
1194 if (gfc_implicit_pure (NULL)
1195 && cons->expr->expr_type == EXPR_VARIABLE
1196 && (gfc_impure_variable (cons->expr->symtree->n.sym)
1197 || gfc_is_coindexed (cons->expr)))
1198 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1206 /****************** Expression name resolution ******************/
1208 /* Returns 0 if a symbol was not declared with a type or
1209 attribute declaration statement, nonzero otherwise. */
1212 was_declared (gfc_symbol *sym)
1218 if (!a.implicit_type && sym->ts.type != BT_UNKNOWN)
1221 if (a.allocatable || a.dimension || a.dummy || a.external || a.intrinsic
1222 || a.optional || a.pointer || a.save || a.target || a.volatile_
1223 || a.value || a.access != ACCESS_UNKNOWN || a.intent != INTENT_UNKNOWN
1224 || a.asynchronous || a.codimension)
1231 /* Determine if a symbol is generic or not. */
1234 generic_sym (gfc_symbol *sym)
1238 if (sym->attr.generic ||
1239 (sym->attr.intrinsic && gfc_generic_intrinsic (sym->name)))
1242 if (was_declared (sym) || sym->ns->parent == NULL)
1245 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1252 return generic_sym (s);
1259 /* Determine if a symbol is specific or not. */
1262 specific_sym (gfc_symbol *sym)
1266 if (sym->attr.if_source == IFSRC_IFBODY
1267 || sym->attr.proc == PROC_MODULE
1268 || sym->attr.proc == PROC_INTERNAL
1269 || sym->attr.proc == PROC_ST_FUNCTION
1270 || (sym->attr.intrinsic && gfc_specific_intrinsic (sym->name))
1271 || sym->attr.external)
1274 if (was_declared (sym) || sym->ns->parent == NULL)
1277 gfc_find_symbol (sym->name, sym->ns->parent, 1, &s);
1279 return (s == NULL) ? 0 : specific_sym (s);
1283 /* Figure out if the procedure is specific, generic or unknown. */
1286 { PTYPE_GENERIC = 1, PTYPE_SPECIFIC, PTYPE_UNKNOWN }
1290 procedure_kind (gfc_symbol *sym)
1292 if (generic_sym (sym))
1293 return PTYPE_GENERIC;
1295 if (specific_sym (sym))
1296 return PTYPE_SPECIFIC;
1298 return PTYPE_UNKNOWN;
1301 /* Check references to assumed size arrays. The flag need_full_assumed_size
1302 is nonzero when matching actual arguments. */
1304 static int need_full_assumed_size = 0;
1307 check_assumed_size_reference (gfc_symbol *sym, gfc_expr *e)
1309 if (need_full_assumed_size || !(sym->as && sym->as->type == AS_ASSUMED_SIZE))
1312 /* FIXME: The comparison "e->ref->u.ar.type == AR_FULL" is wrong.
1313 What should it be? */
1314 if ((e->ref->u.ar.end[e->ref->u.ar.as->rank - 1] == NULL)
1315 && (e->ref->u.ar.as->type == AS_ASSUMED_SIZE)
1316 && (e->ref->u.ar.type == AR_FULL))
1318 gfc_error ("The upper bound in the last dimension must "
1319 "appear in the reference to the assumed size "
1320 "array '%s' at %L", sym->name, &e->where);
1327 /* Look for bad assumed size array references in argument expressions
1328 of elemental and array valued intrinsic procedures. Since this is
1329 called from procedure resolution functions, it only recurses at
1333 resolve_assumed_size_actual (gfc_expr *e)
1338 switch (e->expr_type)
1341 if (e->symtree && check_assumed_size_reference (e->symtree->n.sym, e))
1346 if (resolve_assumed_size_actual (e->value.op.op1)
1347 || resolve_assumed_size_actual (e->value.op.op2))
1358 /* Check a generic procedure, passed as an actual argument, to see if
1359 there is a matching specific name. If none, it is an error, and if
1360 more than one, the reference is ambiguous. */
1362 count_specific_procs (gfc_expr *e)
1369 sym = e->symtree->n.sym;
1371 for (p = sym->generic; p; p = p->next)
1372 if (strcmp (sym->name, p->sym->name) == 0)
1374 e->symtree = gfc_find_symtree (p->sym->ns->sym_root,
1380 gfc_error ("'%s' at %L is ambiguous", e->symtree->n.sym->name,
1384 gfc_error ("GENERIC procedure '%s' is not allowed as an actual "
1385 "argument at %L", sym->name, &e->where);
1391 /* See if a call to sym could possibly be a not allowed RECURSION because of
1392 a missing RECURIVE declaration. This means that either sym is the current
1393 context itself, or sym is the parent of a contained procedure calling its
1394 non-RECURSIVE containing procedure.
1395 This also works if sym is an ENTRY. */
1398 is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
1400 gfc_symbol* proc_sym;
1401 gfc_symbol* context_proc;
1402 gfc_namespace* real_context;
1404 if (sym->attr.flavor == FL_PROGRAM)
1407 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
1409 /* If we've got an ENTRY, find real procedure. */
1410 if (sym->attr.entry && sym->ns->entries)
1411 proc_sym = sym->ns->entries->sym;
1415 /* If sym is RECURSIVE, all is well of course. */
1416 if (proc_sym->attr.recursive || gfc_option.flag_recursive)
1419 /* Find the context procedure's "real" symbol if it has entries.
1420 We look for a procedure symbol, so recurse on the parents if we don't
1421 find one (like in case of a BLOCK construct). */
1422 for (real_context = context; ; real_context = real_context->parent)
1424 /* We should find something, eventually! */
1425 gcc_assert (real_context);
1427 context_proc = (real_context->entries ? real_context->entries->sym
1428 : real_context->proc_name);
1430 /* In some special cases, there may not be a proc_name, like for this
1432 real(bad_kind()) function foo () ...
1433 when checking the call to bad_kind ().
1434 In these cases, we simply return here and assume that the
1439 if (context_proc->attr.flavor != FL_LABEL)
1443 /* A call from sym's body to itself is recursion, of course. */
1444 if (context_proc == proc_sym)
1447 /* The same is true if context is a contained procedure and sym the
1449 if (context_proc->attr.contained)
1451 gfc_symbol* parent_proc;
1453 gcc_assert (context->parent);
1454 parent_proc = (context->parent->entries ? context->parent->entries->sym
1455 : context->parent->proc_name);
1457 if (parent_proc == proc_sym)
1465 /* Resolve an intrinsic procedure: Set its function/subroutine attribute,
1466 its typespec and formal argument list. */
1469 resolve_intrinsic (gfc_symbol *sym, locus *loc)
1471 gfc_intrinsic_sym* isym = NULL;
1477 /* Already resolved. */
1478 if (sym->from_intmod && sym->ts.type != BT_UNKNOWN)
1481 /* We already know this one is an intrinsic, so we don't call
1482 gfc_is_intrinsic for full checking but rather use gfc_find_function and
1483 gfc_find_subroutine directly to check whether it is a function or
1486 if (sym->intmod_sym_id)
1487 isym = gfc_intrinsic_function_by_id ((gfc_isym_id) sym->intmod_sym_id);
1489 isym = gfc_find_function (sym->name);
1493 if (sym->ts.type != BT_UNKNOWN && gfc_option.warn_surprising
1494 && !sym->attr.implicit_type)
1495 gfc_warning ("Type specified for intrinsic function '%s' at %L is"
1496 " ignored", sym->name, &sym->declared_at);
1498 if (!sym->attr.function &&
1499 gfc_add_function (&sym->attr, sym->name, loc) == FAILURE)
1504 else if ((isym = gfc_find_subroutine (sym->name)))
1506 if (sym->ts.type != BT_UNKNOWN && !sym->attr.implicit_type)
1508 gfc_error ("Intrinsic subroutine '%s' at %L shall not have a type"
1509 " specifier", sym->name, &sym->declared_at);
1513 if (!sym->attr.subroutine &&
1514 gfc_add_subroutine (&sym->attr, sym->name, loc) == FAILURE)
1519 gfc_error ("'%s' declared INTRINSIC at %L does not exist", sym->name,
1524 gfc_copy_formal_args_intr (sym, isym);
1526 /* Check it is actually available in the standard settings. */
1527 if (gfc_check_intrinsic_standard (isym, &symstd, false, sym->declared_at)
1530 gfc_error ("The intrinsic '%s' declared INTRINSIC at %L is not"
1531 " available in the current standard settings but %s. Use"
1532 " an appropriate -std=* option or enable -fall-intrinsics"
1533 " in order to use it.",
1534 sym->name, &sym->declared_at, symstd);
1542 /* Resolve a procedure expression, like passing it to a called procedure or as
1543 RHS for a procedure pointer assignment. */
1546 resolve_procedure_expression (gfc_expr* expr)
1550 if (expr->expr_type != EXPR_VARIABLE)
1552 gcc_assert (expr->symtree);
1554 sym = expr->symtree->n.sym;
1556 if (sym->attr.intrinsic)
1557 resolve_intrinsic (sym, &expr->where);
1559 if (sym->attr.flavor != FL_PROCEDURE
1560 || (sym->attr.function && sym->result == sym))
1563 /* A non-RECURSIVE procedure that is used as procedure expression within its
1564 own body is in danger of being called recursively. */
1565 if (is_illegal_recursion (sym, gfc_current_ns))
1566 gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
1567 " itself recursively. Declare it RECURSIVE or use"
1568 " -frecursive", sym->name, &expr->where);
1574 /* Resolve an actual argument list. Most of the time, this is just
1575 resolving the expressions in the list.
1576 The exception is that we sometimes have to decide whether arguments
1577 that look like procedure arguments are really simple variable
1581 resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
1582 bool no_formal_args)
1585 gfc_symtree *parent_st;
1587 int save_need_full_assumed_size;
1589 for (; arg; arg = arg->next)
1594 /* Check the label is a valid branching target. */
1597 if (arg->label->defined == ST_LABEL_UNKNOWN)
1599 gfc_error ("Label %d referenced at %L is never defined",
1600 arg->label->value, &arg->label->where);
1607 if (e->expr_type == EXPR_VARIABLE
1608 && e->symtree->n.sym->attr.generic
1610 && count_specific_procs (e) != 1)
1613 if (e->ts.type != BT_PROCEDURE)
1615 save_need_full_assumed_size = need_full_assumed_size;
1616 if (e->expr_type != EXPR_VARIABLE)
1617 need_full_assumed_size = 0;
1618 if (gfc_resolve_expr (e) != SUCCESS)
1620 need_full_assumed_size = save_need_full_assumed_size;
1624 /* See if the expression node should really be a variable reference. */
1626 sym = e->symtree->n.sym;
1628 if (sym->attr.flavor == FL_PROCEDURE
1629 || sym->attr.intrinsic
1630 || sym->attr.external)
1634 /* If a procedure is not already determined to be something else
1635 check if it is intrinsic. */
1636 if (!sym->attr.intrinsic
1637 && !(sym->attr.external || sym->attr.use_assoc
1638 || sym->attr.if_source == IFSRC_IFBODY)
1639 && gfc_is_intrinsic (sym, sym->attr.subroutine, e->where))
1640 sym->attr.intrinsic = 1;
1642 if (sym->attr.proc == PROC_ST_FUNCTION)
1644 gfc_error ("Statement function '%s' at %L is not allowed as an "
1645 "actual argument", sym->name, &e->where);
1648 actual_ok = gfc_intrinsic_actual_ok (sym->name,
1649 sym->attr.subroutine);
1650 if (sym->attr.intrinsic && actual_ok == 0)
1652 gfc_error ("Intrinsic '%s' at %L is not allowed as an "
1653 "actual argument", sym->name, &e->where);
1656 if (sym->attr.contained && !sym->attr.use_assoc
1657 && sym->ns->proc_name->attr.flavor != FL_MODULE)
1659 if (gfc_notify_std (GFC_STD_F2008,
1660 "Fortran 2008: Internal procedure '%s' is"
1661 " used as actual argument at %L",
1662 sym->name, &e->where) == FAILURE)
1666 if (sym->attr.elemental && !sym->attr.intrinsic)
1668 gfc_error ("ELEMENTAL non-INTRINSIC procedure '%s' is not "
1669 "allowed as an actual argument at %L", sym->name,
1673 /* Check if a generic interface has a specific procedure
1674 with the same name before emitting an error. */
1675 if (sym->attr.generic && count_specific_procs (e) != 1)
1678 /* Just in case a specific was found for the expression. */
1679 sym = e->symtree->n.sym;
1681 /* If the symbol is the function that names the current (or
1682 parent) scope, then we really have a variable reference. */
1684 if (gfc_is_function_return_value (sym, sym->ns))
1687 /* If all else fails, see if we have a specific intrinsic. */
1688 if (sym->ts.type == BT_UNKNOWN && sym->attr.intrinsic)
1690 gfc_intrinsic_sym *isym;
1692 isym = gfc_find_function (sym->name);
1693 if (isym == NULL || !isym->specific)
1695 gfc_error ("Unable to find a specific INTRINSIC procedure "
1696 "for the reference '%s' at %L", sym->name,
1701 sym->attr.intrinsic = 1;
1702 sym->attr.function = 1;
1705 if (gfc_resolve_expr (e) == FAILURE)
1710 /* See if the name is a module procedure in a parent unit. */
1712 if (was_declared (sym) || sym->ns->parent == NULL)
1715 if (gfc_find_sym_tree (sym->name, sym->ns->parent, 1, &parent_st))
1717 gfc_error ("Symbol '%s' at %L is ambiguous", sym->name, &e->where);
1721 if (parent_st == NULL)
1724 sym = parent_st->n.sym;
1725 e->symtree = parent_st; /* Point to the right thing. */
1727 if (sym->attr.flavor == FL_PROCEDURE
1728 || sym->attr.intrinsic
1729 || sym->attr.external)
1731 if (gfc_resolve_expr (e) == FAILURE)
1737 e->expr_type = EXPR_VARIABLE;
1739 if (sym->as != NULL)
1741 e->rank = sym->as->rank;
1742 e->ref = gfc_get_ref ();
1743 e->ref->type = REF_ARRAY;
1744 e->ref->u.ar.type = AR_FULL;
1745 e->ref->u.ar.as = sym->as;
1748 /* Expressions are assigned a default ts.type of BT_PROCEDURE in
1749 primary.c (match_actual_arg). If above code determines that it
1750 is a variable instead, it needs to be resolved as it was not
1751 done at the beginning of this function. */
1752 save_need_full_assumed_size = need_full_assumed_size;
1753 if (e->expr_type != EXPR_VARIABLE)
1754 need_full_assumed_size = 0;
1755 if (gfc_resolve_expr (e) != SUCCESS)
1757 need_full_assumed_size = save_need_full_assumed_size;
1760 /* Check argument list functions %VAL, %LOC and %REF. There is
1761 nothing to do for %REF. */
1762 if (arg->name && arg->name[0] == '%')
1764 if (strncmp ("%VAL", arg->name, 4) == 0)
1766 if (e->ts.type == BT_CHARACTER || e->ts.type == BT_DERIVED)
1768 gfc_error ("By-value argument at %L is not of numeric "
1775 gfc_error ("By-value argument at %L cannot be an array or "
1776 "an array section", &e->where);
1780 /* Intrinsics are still PROC_UNKNOWN here. However,
1781 since same file external procedures are not resolvable
1782 in gfortran, it is a good deal easier to leave them to
1784 if (ptype != PROC_UNKNOWN
1785 && ptype != PROC_DUMMY
1786 && ptype != PROC_EXTERNAL
1787 && ptype != PROC_MODULE)
1789 gfc_error ("By-value argument at %L is not allowed "
1790 "in this context", &e->where);
1795 /* Statement functions have already been excluded above. */
1796 else if (strncmp ("%LOC", arg->name, 4) == 0
1797 && e->ts.type == BT_PROCEDURE)
1799 if (e->symtree->n.sym->attr.proc == PROC_INTERNAL)
1801 gfc_error ("Passing internal procedure at %L by location "
1802 "not allowed", &e->where);
1808 /* Fortran 2008, C1237. */
1809 if (e->expr_type == EXPR_VARIABLE && gfc_is_coindexed (e)
1810 && gfc_has_ultimate_pointer (e))
1812 gfc_error ("Coindexed actual argument at %L with ultimate pointer "
1813 "component", &e->where);
1822 /* Do the checks of the actual argument list that are specific to elemental
1823 procedures. If called with c == NULL, we have a function, otherwise if
1824 expr == NULL, we have a subroutine. */
1827 resolve_elemental_actual (gfc_expr *expr, gfc_code *c)
1829 gfc_actual_arglist *arg0;
1830 gfc_actual_arglist *arg;
1831 gfc_symbol *esym = NULL;
1832 gfc_intrinsic_sym *isym = NULL;
1834 gfc_intrinsic_arg *iformal = NULL;
1835 gfc_formal_arglist *eformal = NULL;
1836 bool formal_optional = false;
1837 bool set_by_optional = false;
1841 /* Is this an elemental procedure? */
1842 if (expr && expr->value.function.actual != NULL)
1844 if (expr->value.function.esym != NULL
1845 && expr->value.function.esym->attr.elemental)
1847 arg0 = expr->value.function.actual;
1848 esym = expr->value.function.esym;
1850 else if (expr->value.function.isym != NULL
1851 && expr->value.function.isym->elemental)
1853 arg0 = expr->value.function.actual;
1854 isym = expr->value.function.isym;
1859 else if (c && c->ext.actual != NULL)
1861 arg0 = c->ext.actual;
1863 if (c->resolved_sym)
1864 esym = c->resolved_sym;
1866 esym = c->symtree->n.sym;
1869 if (!esym->attr.elemental)
1875 /* The rank of an elemental is the rank of its array argument(s). */
1876 for (arg = arg0; arg; arg = arg->next)
1878 if (arg->expr != NULL && arg->expr->rank > 0)
1880 rank = arg->expr->rank;
1881 if (arg->expr->expr_type == EXPR_VARIABLE
1882 && arg->expr->symtree->n.sym->attr.optional)
1883 set_by_optional = true;
1885 /* Function specific; set the result rank and shape. */
1889 if (!expr->shape && arg->expr->shape)
1891 expr->shape = gfc_get_shape (rank);
1892 for (i = 0; i < rank; i++)
1893 mpz_init_set (expr->shape[i], arg->expr->shape[i]);
1900 /* If it is an array, it shall not be supplied as an actual argument
1901 to an elemental procedure unless an array of the same rank is supplied
1902 as an actual argument corresponding to a nonoptional dummy argument of
1903 that elemental procedure(12.4.1.5). */
1904 formal_optional = false;
1906 iformal = isym->formal;
1908 eformal = esym->formal;
1910 for (arg = arg0; arg; arg = arg->next)
1914 if (eformal->sym && eformal->sym->attr.optional)
1915 formal_optional = true;
1916 eformal = eformal->next;
1918 else if (isym && iformal)
1920 if (iformal->optional)
1921 formal_optional = true;
1922 iformal = iformal->next;
1925 formal_optional = true;
1927 if (pedantic && arg->expr != NULL
1928 && arg->expr->expr_type == EXPR_VARIABLE
1929 && arg->expr->symtree->n.sym->attr.optional
1932 && (set_by_optional || arg->expr->rank != rank)
1933 && !(isym && isym->id == GFC_ISYM_CONVERSION))
1935 gfc_warning ("'%s' at %L is an array and OPTIONAL; IF IT IS "
1936 "MISSING, it cannot be the actual argument of an "
1937 "ELEMENTAL procedure unless there is a non-optional "
1938 "argument with the same rank (12.4.1.5)",
1939 arg->expr->symtree->n.sym->name, &arg->expr->where);
1944 for (arg = arg0; arg; arg = arg->next)
1946 if (arg->expr == NULL || arg->expr->rank == 0)
1949 /* Being elemental, the last upper bound of an assumed size array
1950 argument must be present. */
1951 if (resolve_assumed_size_actual (arg->expr))
1954 /* Elemental procedure's array actual arguments must conform. */
1957 if (gfc_check_conformance (arg->expr, e,
1958 "elemental procedure") == FAILURE)
1965 /* INTENT(OUT) is only allowed for subroutines; if any actual argument
1966 is an array, the intent inout/out variable needs to be also an array. */
1967 if (rank > 0 && esym && expr == NULL)
1968 for (eformal = esym->formal, arg = arg0; arg && eformal;
1969 arg = arg->next, eformal = eformal->next)
1970 if ((eformal->sym->attr.intent == INTENT_OUT
1971 || eformal->sym->attr.intent == INTENT_INOUT)
1972 && arg->expr && arg->expr->rank == 0)
1974 gfc_error ("Actual argument at %L for INTENT(%s) dummy '%s' of "
1975 "ELEMENTAL subroutine '%s' is a scalar, but another "
1976 "actual argument is an array", &arg->expr->where,
1977 (eformal->sym->attr.intent == INTENT_OUT) ? "OUT"
1978 : "INOUT", eformal->sym->name, esym->name);
1985 /* This function does the checking of references to global procedures
1986 as defined in sections 18.1 and 14.1, respectively, of the Fortran
1987 77 and 95 standards. It checks for a gsymbol for the name, making
1988 one if it does not already exist. If it already exists, then the
1989 reference being resolved must correspond to the type of gsymbol.
1990 Otherwise, the new symbol is equipped with the attributes of the
1991 reference. The corresponding code that is called in creating
1992 global entities is parse.c.
1994 In addition, for all but -std=legacy, the gsymbols are used to
1995 check the interfaces of external procedures from the same file.
1996 The namespace of the gsymbol is resolved and then, once this is
1997 done the interface is checked. */
2001 not_in_recursive (gfc_symbol *sym, gfc_namespace *gsym_ns)
2003 if (!gsym_ns->proc_name->attr.recursive)
2006 if (sym->ns == gsym_ns)
2009 if (sym->ns->parent && sym->ns->parent == gsym_ns)
2016 not_entry_self_reference (gfc_symbol *sym, gfc_namespace *gsym_ns)
2018 if (gsym_ns->entries)
2020 gfc_entry_list *entry = gsym_ns->entries;
2022 for (; entry; entry = entry->next)
2024 if (strcmp (sym->name, entry->sym->name) == 0)
2026 if (strcmp (gsym_ns->proc_name->name,
2027 sym->ns->proc_name->name) == 0)
2031 && strcmp (gsym_ns->proc_name->name,
2032 sym->ns->parent->proc_name->name) == 0)
2041 resolve_global_procedure (gfc_symbol *sym, locus *where,
2042 gfc_actual_arglist **actual, int sub)
2046 enum gfc_symbol_type type;
2048 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
2050 gsym = gfc_get_gsymbol (sym->name);
2052 if ((gsym->type != GSYM_UNKNOWN && gsym->type != type))
2053 gfc_global_used (gsym, where);
2055 if (gfc_option.flag_whole_file
2056 && (sym->attr.if_source == IFSRC_UNKNOWN
2057 || sym->attr.if_source == IFSRC_IFBODY)
2058 && gsym->type != GSYM_UNKNOWN
2060 && gsym->ns->resolved != -1
2061 && gsym->ns->proc_name
2062 && not_in_recursive (sym, gsym->ns)
2063 && not_entry_self_reference (sym, gsym->ns))
2065 gfc_symbol *def_sym;
2067 /* Resolve the gsymbol namespace if needed. */
2068 if (!gsym->ns->resolved)
2070 gfc_dt_list *old_dt_list;
2071 struct gfc_omp_saved_state old_omp_state;
2073 /* Stash away derived types so that the backend_decls do not
2075 old_dt_list = gfc_derived_types;
2076 gfc_derived_types = NULL;
2077 /* And stash away openmp state. */
2078 gfc_omp_save_and_clear_state (&old_omp_state);
2080 gfc_resolve (gsym->ns);
2082 /* Store the new derived types with the global namespace. */
2083 if (gfc_derived_types)
2084 gsym->ns->derived_types = gfc_derived_types;
2086 /* Restore the derived types of this namespace. */
2087 gfc_derived_types = old_dt_list;
2088 /* And openmp state. */
2089 gfc_omp_restore_state (&old_omp_state);
2092 /* Make sure that translation for the gsymbol occurs before
2093 the procedure currently being resolved. */
2094 ns = gfc_global_ns_list;
2095 for (; ns && ns != gsym->ns; ns = ns->sibling)
2097 if (ns->sibling == gsym->ns)
2099 ns->sibling = gsym->ns->sibling;
2100 gsym->ns->sibling = gfc_global_ns_list;
2101 gfc_global_ns_list = gsym->ns;
2106 def_sym = gsym->ns->proc_name;
2107 if (def_sym->attr.entry_master)
2109 gfc_entry_list *entry;
2110 for (entry = gsym->ns->entries; entry; entry = entry->next)
2111 if (strcmp (entry->sym->name, sym->name) == 0)
2113 def_sym = entry->sym;
2118 /* Differences in constant character lengths. */
2119 if (sym->attr.function && sym->ts.type == BT_CHARACTER)
2121 long int l1 = 0, l2 = 0;
2122 gfc_charlen *cl1 = sym->ts.u.cl;
2123 gfc_charlen *cl2 = def_sym->ts.u.cl;
2126 && cl1->length != NULL
2127 && cl1->length->expr_type == EXPR_CONSTANT)
2128 l1 = mpz_get_si (cl1->length->value.integer);
2131 && cl2->length != NULL
2132 && cl2->length->expr_type == EXPR_CONSTANT)
2133 l2 = mpz_get_si (cl2->length->value.integer);
2135 if (l1 && l2 && l1 != l2)
2136 gfc_error ("Character length mismatch in return type of "
2137 "function '%s' at %L (%ld/%ld)", sym->name,
2138 &sym->declared_at, l1, l2);
2141 /* Type mismatch of function return type and expected type. */
2142 if (sym->attr.function
2143 && !gfc_compare_types (&sym->ts, &def_sym->ts))
2144 gfc_error ("Return type mismatch of function '%s' at %L (%s/%s)",
2145 sym->name, &sym->declared_at, gfc_typename (&sym->ts),
2146 gfc_typename (&def_sym->ts));
2148 if (def_sym->formal && sym->attr.if_source != IFSRC_IFBODY)
2150 gfc_formal_arglist *arg = def_sym->formal;
2151 for ( ; arg; arg = arg->next)
2154 /* F2003, 12.3.1.1 (2a); F2008, 12.4.2.2 (2a) */
2155 else if (arg->sym->attr.allocatable
2156 || arg->sym->attr.asynchronous
2157 || arg->sym->attr.optional
2158 || arg->sym->attr.pointer
2159 || arg->sym->attr.target
2160 || arg->sym->attr.value
2161 || arg->sym->attr.volatile_)
2163 gfc_error ("Dummy argument '%s' of procedure '%s' at %L "
2164 "has an attribute that requires an explicit "
2165 "interface for this procedure", arg->sym->name,
2166 sym->name, &sym->declared_at);
2169 /* F2003, 12.3.1.1 (2b); F2008, 12.4.2.2 (2b) */
2170 else if (arg->sym && arg->sym->as
2171 && arg->sym->as->type == AS_ASSUMED_SHAPE)
2173 gfc_error ("Procedure '%s' at %L with assumed-shape dummy "
2174 "argument '%s' must have an explicit interface",
2175 sym->name, &sym->declared_at, arg->sym->name);
2178 /* F2008, 12.4.2.2 (2c) */
2179 else if (arg->sym->attr.codimension)
2181 gfc_error ("Procedure '%s' at %L with coarray dummy argument "
2182 "'%s' must have an explicit interface",
2183 sym->name, &sym->declared_at, arg->sym->name);
2186 /* F2003, 12.3.1.1 (2c); F2008, 12.4.2.2 (2d) */
2187 else if (false) /* TODO: is a parametrized derived type */
2189 gfc_error ("Procedure '%s' at %L with parametrized derived "
2190 "type argument '%s' must have an explicit "
2191 "interface", sym->name, &sym->declared_at,
2195 /* F2003, 12.3.1.1 (2d); F2008, 12.4.2.2 (2e) */
2196 else if (arg->sym->ts.type == BT_CLASS)
2198 gfc_error ("Procedure '%s' at %L with polymorphic dummy "
2199 "argument '%s' must have an explicit interface",
2200 sym->name, &sym->declared_at, arg->sym->name);
2205 if (def_sym->attr.function)
2207 /* F2003, 12.3.1.1 (3a); F2008, 12.4.2.2 (3a) */
2208 if (def_sym->as && def_sym->as->rank
2209 && (!sym->as || sym->as->rank != def_sym->as->rank))
2210 gfc_error ("The reference to function '%s' at %L either needs an "
2211 "explicit INTERFACE or the rank is incorrect", sym->name,
2214 /* F2003, 12.3.1.1 (3b); F2008, 12.4.2.2 (3b) */
2215 if ((def_sym->result->attr.pointer
2216 || def_sym->result->attr.allocatable)
2217 && (sym->attr.if_source != IFSRC_IFBODY
2218 || def_sym->result->attr.pointer
2219 != sym->result->attr.pointer
2220 || def_sym->result->attr.allocatable
2221 != sym->result->attr.allocatable))
2222 gfc_error ("Function '%s' at %L with a POINTER or ALLOCATABLE "
2223 "result must have an explicit interface", sym->name,
2226 /* F2003, 12.3.1.1 (3c); F2008, 12.4.2.2 (3c) */
2227 if (sym->ts.type == BT_CHARACTER && sym->attr.if_source != IFSRC_IFBODY
2228 && def_sym->ts.type == BT_CHARACTER && def_sym->ts.u.cl->length != NULL)
2230 gfc_charlen *cl = sym->ts.u.cl;
2232 if (!sym->attr.entry_master && sym->attr.if_source == IFSRC_UNKNOWN
2233 && cl && cl->length && cl->length->expr_type != EXPR_CONSTANT)
2235 gfc_error ("Nonconstant character-length function '%s' at %L "
2236 "must have an explicit interface", sym->name,
2242 /* F2003, 12.3.1.1 (4); F2008, 12.4.2.2 (4) */
2243 if (def_sym->attr.elemental && !sym->attr.elemental)
2245 gfc_error ("ELEMENTAL procedure '%s' at %L must have an explicit "
2246 "interface", sym->name, &sym->declared_at);
2249 /* F2003, 12.3.1.1 (5); F2008, 12.4.2.2 (5) */
2250 if (def_sym->attr.is_bind_c && !sym->attr.is_bind_c)
2252 gfc_error ("Procedure '%s' at %L with BIND(C) attribute must have "
2253 "an explicit interface", sym->name, &sym->declared_at);
2256 if (gfc_option.flag_whole_file == 1
2257 || ((gfc_option.warn_std & GFC_STD_LEGACY)
2258 && !(gfc_option.warn_std & GFC_STD_GNU)))
2259 gfc_errors_to_warnings (1);
2261 if (sym->attr.if_source != IFSRC_IFBODY)
2262 gfc_procedure_use (def_sym, actual, where);
2264 gfc_errors_to_warnings (0);
2267 if (gsym->type == GSYM_UNKNOWN)
2270 gsym->where = *where;
2277 /************* Function resolution *************/
2279 /* Resolve a function call known to be generic.
2280 Section 14.1.2.4.1. */
2283 resolve_generic_f0 (gfc_expr *expr, gfc_symbol *sym)
2287 if (sym->attr.generic)
2289 s = gfc_search_interface (sym->generic, 0, &expr->value.function.actual);
2292 expr->value.function.name = s->name;
2293 expr->value.function.esym = s;
2295 if (s->ts.type != BT_UNKNOWN)
2297 else if (s->result != NULL && s->result->ts.type != BT_UNKNOWN)
2298 expr->ts = s->result->ts;
2301 expr->rank = s->as->rank;
2302 else if (s->result != NULL && s->result->as != NULL)
2303 expr->rank = s->result->as->rank;
2305 gfc_set_sym_referenced (expr->value.function.esym);
2310 /* TODO: Need to search for elemental references in generic
2314 if (sym->attr.intrinsic)
2315 return gfc_intrinsic_func_interface (expr, 0);
2322 resolve_generic_f (gfc_expr *expr)
2327 sym = expr->symtree->n.sym;
2331 m = resolve_generic_f0 (expr, sym);
2334 else if (m == MATCH_ERROR)
2338 if (sym->ns->parent == NULL)
2340 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2344 if (!generic_sym (sym))
2348 /* Last ditch attempt. See if the reference is to an intrinsic
2349 that possesses a matching interface. 14.1.2.4 */
2350 if (sym && !gfc_is_intrinsic (sym, 0, expr->where))
2352 gfc_error ("There is no specific function for the generic '%s' at %L",
2353 expr->symtree->n.sym->name, &expr->where);
2357 m = gfc_intrinsic_func_interface (expr, 0);
2361 gfc_error ("Generic function '%s' at %L is not consistent with a "
2362 "specific intrinsic interface", expr->symtree->n.sym->name,
2369 /* Resolve a function call known to be specific. */
2372 resolve_specific_f0 (gfc_symbol *sym, gfc_expr *expr)
2376 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
2378 if (sym->attr.dummy)
2380 sym->attr.proc = PROC_DUMMY;
2384 sym->attr.proc = PROC_EXTERNAL;
2388 if (sym->attr.proc == PROC_MODULE
2389 || sym->attr.proc == PROC_ST_FUNCTION
2390 || sym->attr.proc == PROC_INTERNAL)
2393 if (sym->attr.intrinsic)
2395 m = gfc_intrinsic_func_interface (expr, 1);
2399 gfc_error ("Function '%s' at %L is INTRINSIC but is not compatible "
2400 "with an intrinsic", sym->name, &expr->where);
2408 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2411 expr->ts = sym->result->ts;
2414 expr->value.function.name = sym->name;
2415 expr->value.function.esym = sym;
2416 if (sym->as != NULL)
2417 expr->rank = sym->as->rank;
2424 resolve_specific_f (gfc_expr *expr)
2429 sym = expr->symtree->n.sym;
2433 m = resolve_specific_f0 (sym, expr);
2436 if (m == MATCH_ERROR)
2439 if (sym->ns->parent == NULL)
2442 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
2448 gfc_error ("Unable to resolve the specific function '%s' at %L",
2449 expr->symtree->n.sym->name, &expr->where);
2455 /* Resolve a procedure call not known to be generic nor specific. */
2458 resolve_unknown_f (gfc_expr *expr)
2463 sym = expr->symtree->n.sym;
2465 if (sym->attr.dummy)
2467 sym->attr.proc = PROC_DUMMY;
2468 expr->value.function.name = sym->name;
2472 /* See if we have an intrinsic function reference. */
2474 if (gfc_is_intrinsic (sym, 0, expr->where))
2476 if (gfc_intrinsic_func_interface (expr, 1) == MATCH_YES)
2481 /* The reference is to an external name. */
2483 sym->attr.proc = PROC_EXTERNAL;
2484 expr->value.function.name = sym->name;
2485 expr->value.function.esym = expr->symtree->n.sym;
2487 if (sym->as != NULL)
2488 expr->rank = sym->as->rank;
2490 /* Type of the expression is either the type of the symbol or the
2491 default type of the symbol. */
2494 gfc_procedure_use (sym, &expr->value.function.actual, &expr->where);
2496 if (sym->ts.type != BT_UNKNOWN)
2500 ts = gfc_get_default_type (sym->name, sym->ns);
2502 if (ts->type == BT_UNKNOWN)
2504 gfc_error ("Function '%s' at %L has no IMPLICIT type",
2505 sym->name, &expr->where);
2516 /* Return true, if the symbol is an external procedure. */
2518 is_external_proc (gfc_symbol *sym)
2520 if (!sym->attr.dummy && !sym->attr.contained
2521 && !(sym->attr.intrinsic
2522 || gfc_is_intrinsic (sym, sym->attr.subroutine, sym->declared_at))
2523 && sym->attr.proc != PROC_ST_FUNCTION
2524 && !sym->attr.proc_pointer
2525 && !sym->attr.use_assoc
2533 /* Figure out if a function reference is pure or not. Also set the name
2534 of the function for a potential error message. Return nonzero if the
2535 function is PURE, zero if not. */
2537 pure_stmt_function (gfc_expr *, gfc_symbol *);
2540 pure_function (gfc_expr *e, const char **name)
2546 if (e->symtree != NULL
2547 && e->symtree->n.sym != NULL
2548 && e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2549 return pure_stmt_function (e, e->symtree->n.sym);
2551 if (e->value.function.esym)
2553 pure = gfc_pure (e->value.function.esym);
2554 *name = e->value.function.esym->name;
2556 else if (e->value.function.isym)
2558 pure = e->value.function.isym->pure
2559 || e->value.function.isym->elemental;
2560 *name = e->value.function.isym->name;
2564 /* Implicit functions are not pure. */
2566 *name = e->value.function.name;
2574 impure_stmt_fcn (gfc_expr *e, gfc_symbol *sym,
2575 int *f ATTRIBUTE_UNUSED)
2579 /* Don't bother recursing into other statement functions
2580 since they will be checked individually for purity. */
2581 if (e->expr_type != EXPR_FUNCTION
2583 || e->symtree->n.sym == sym
2584 || e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
2587 return pure_function (e, &name) ? false : true;
2592 pure_stmt_function (gfc_expr *e, gfc_symbol *sym)
2594 return gfc_traverse_expr (e, sym, impure_stmt_fcn, 0) ? 0 : 1;
2599 is_scalar_expr_ptr (gfc_expr *expr)
2601 gfc_try retval = SUCCESS;
2606 /* See if we have a gfc_ref, which means we have a substring, array
2607 reference, or a component. */
2608 if (expr->ref != NULL)
2611 while (ref->next != NULL)
2617 if (ref->u.ss.start == NULL || ref->u.ss.end == NULL
2618 || gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) != 0)
2623 if (ref->u.ar.type == AR_ELEMENT)
2625 else if (ref->u.ar.type == AR_FULL)
2627 /* The user can give a full array if the array is of size 1. */
2628 if (ref->u.ar.as != NULL
2629 && ref->u.ar.as->rank == 1
2630 && ref->u.ar.as->type == AS_EXPLICIT
2631 && ref->u.ar.as->lower[0] != NULL
2632 && ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
2633 && ref->u.ar.as->upper[0] != NULL
2634 && ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT)
2636 /* If we have a character string, we need to check if
2637 its length is one. */
2638 if (expr->ts.type == BT_CHARACTER)
2640 if (expr->ts.u.cl == NULL
2641 || expr->ts.u.cl->length == NULL
2642 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1)
2648 /* We have constant lower and upper bounds. If the
2649 difference between is 1, it can be considered a
2651 FIXME: Use gfc_dep_compare_expr instead. */
2652 start = (int) mpz_get_si
2653 (ref->u.ar.as->lower[0]->value.integer);
2654 end = (int) mpz_get_si
2655 (ref->u.ar.as->upper[0]->value.integer);
2656 if (end - start + 1 != 1)
2671 else if (expr->ts.type == BT_CHARACTER && expr->rank == 0)
2673 /* Character string. Make sure it's of length 1. */
2674 if (expr->ts.u.cl == NULL
2675 || expr->ts.u.cl->length == NULL
2676 || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0)
2679 else if (expr->rank != 0)
2686 /* Match one of the iso_c_binding functions (c_associated or c_loc)
2687 and, in the case of c_associated, set the binding label based on
2691 gfc_iso_c_func_interface (gfc_symbol *sym, gfc_actual_arglist *args,
2692 gfc_symbol **new_sym)
2694 char name[GFC_MAX_SYMBOL_LEN + 1];
2695 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
2696 int optional_arg = 0;
2697 gfc_try retval = SUCCESS;
2698 gfc_symbol *args_sym;
2699 gfc_typespec *arg_ts;
2700 symbol_attribute arg_attr;
2702 if (args->expr->expr_type == EXPR_CONSTANT
2703 || args->expr->expr_type == EXPR_OP
2704 || args->expr->expr_type == EXPR_NULL)
2706 gfc_error ("Argument to '%s' at %L is not a variable",
2707 sym->name, &(args->expr->where));
2711 args_sym = args->expr->symtree->n.sym;
2713 /* The typespec for the actual arg should be that stored in the expr
2714 and not necessarily that of the expr symbol (args_sym), because
2715 the actual expression could be a part-ref of the expr symbol. */
2716 arg_ts = &(args->expr->ts);
2717 arg_attr = gfc_expr_attr (args->expr);
2719 if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2721 /* If the user gave two args then they are providing something for
2722 the optional arg (the second cptr). Therefore, set the name and
2723 binding label to the c_associated for two cptrs. Otherwise,
2724 set c_associated to expect one cptr. */
2728 sprintf (name, "%s_2", sym->name);
2729 sprintf (binding_label, "%s_2", sym->binding_label);
2735 sprintf (name, "%s_1", sym->name);
2736 sprintf (binding_label, "%s_1", sym->binding_label);
2740 /* Get a new symbol for the version of c_associated that
2742 *new_sym = get_iso_c_sym (sym, name, binding_label, optional_arg);
2744 else if (sym->intmod_sym_id == ISOCBINDING_LOC
2745 || sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2747 sprintf (name, "%s", sym->name);
2748 sprintf (binding_label, "%s", sym->binding_label);
2750 /* Error check the call. */
2751 if (args->next != NULL)
2753 gfc_error_now ("More actual than formal arguments in '%s' "
2754 "call at %L", name, &(args->expr->where));
2757 else if (sym->intmod_sym_id == ISOCBINDING_LOC)
2762 /* Make sure we have either the target or pointer attribute. */
2763 if (!arg_attr.target && !arg_attr.pointer)
2765 gfc_error_now ("Parameter '%s' to '%s' at %L must be either "
2766 "a TARGET or an associated pointer",
2768 sym->name, &(args->expr->where));
2772 if (gfc_is_coindexed (args->expr))
2774 gfc_error_now ("Coindexed argument not permitted"
2775 " in '%s' call at %L", name,
2776 &(args->expr->where));
2780 /* Follow references to make sure there are no array
2782 seen_section = false;
2784 for (ref=args->expr->ref; ref; ref = ref->next)
2786 if (ref->type == REF_ARRAY)
2788 if (ref->u.ar.type == AR_SECTION)
2789 seen_section = true;
2791 if (ref->u.ar.type != AR_ELEMENT)
2794 for (r = ref->next; r; r=r->next)
2795 if (r->type == REF_COMPONENT)
2797 gfc_error_now ("Array section not permitted"
2798 " in '%s' call at %L", name,
2799 &(args->expr->where));
2807 if (seen_section && retval == SUCCESS)
2808 gfc_warning ("Array section in '%s' call at %L", name,
2809 &(args->expr->where));
2811 /* See if we have interoperable type and type param. */
2812 if (gfc_verify_c_interop (arg_ts) == SUCCESS
2813 || gfc_check_any_c_kind (arg_ts) == SUCCESS)
2815 if (args_sym->attr.target == 1)
2817 /* Case 1a, section 15.1.2.5, J3/04-007: variable that
2818 has the target attribute and is interoperable. */
2819 /* Case 1b, section 15.1.2.5, J3/04-007: allocated
2820 allocatable variable that has the TARGET attribute and
2821 is not an array of zero size. */
2822 if (args_sym->attr.allocatable == 1)
2824 if (args_sym->attr.dimension != 0
2825 && (args_sym->as && args_sym->as->rank == 0))
2827 gfc_error_now ("Allocatable variable '%s' used as a "
2828 "parameter to '%s' at %L must not be "
2829 "an array of zero size",
2830 args_sym->name, sym->name,
2831 &(args->expr->where));
2837 /* A non-allocatable target variable with C
2838 interoperable type and type parameters must be
2840 if (args_sym && args_sym->attr.dimension)
2842 if (args_sym->as->type == AS_ASSUMED_SHAPE)
2844 gfc_error ("Assumed-shape array '%s' at %L "
2845 "cannot be an argument to the "
2846 "procedure '%s' because "
2847 "it is not C interoperable",
2849 &(args->expr->where), sym->name);
2852 else if (args_sym->as->type == AS_DEFERRED)
2854 gfc_error ("Deferred-shape array '%s' at %L "
2855 "cannot be an argument to the "
2856 "procedure '%s' because "
2857 "it is not C interoperable",
2859 &(args->expr->where), sym->name);
2864 /* Make sure it's not a character string. Arrays of
2865 any type should be ok if the variable is of a C
2866 interoperable type. */
2867 if (arg_ts->type == BT_CHARACTER)
2868 if (arg_ts->u.cl != NULL
2869 && (arg_ts->u.cl->length == NULL
2870 || arg_ts->u.cl->length->expr_type
2873 (arg_ts->u.cl->length->value.integer, 1)
2875 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2877 gfc_error_now ("CHARACTER argument '%s' to '%s' "
2878 "at %L must have a length of 1",
2879 args_sym->name, sym->name,
2880 &(args->expr->where));
2885 else if (arg_attr.pointer
2886 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2888 /* Case 1c, section 15.1.2.5, J3/04-007: an associated
2890 gfc_error_now ("Argument '%s' to '%s' at %L must be an "
2891 "associated scalar POINTER", args_sym->name,
2892 sym->name, &(args->expr->where));
2898 /* The parameter is not required to be C interoperable. If it
2899 is not C interoperable, it must be a nonpolymorphic scalar
2900 with no length type parameters. It still must have either
2901 the pointer or target attribute, and it can be
2902 allocatable (but must be allocated when c_loc is called). */
2903 if (args->expr->rank != 0
2904 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2906 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2907 "scalar", args_sym->name, sym->name,
2908 &(args->expr->where));
2911 else if (arg_ts->type == BT_CHARACTER
2912 && is_scalar_expr_ptr (args->expr) != SUCCESS)
2914 gfc_error_now ("CHARACTER argument '%s' to '%s' at "
2915 "%L must have a length of 1",
2916 args_sym->name, sym->name,
2917 &(args->expr->where));
2920 else if (arg_ts->type == BT_CLASS)
2922 gfc_error_now ("Parameter '%s' to '%s' at %L must not be "
2923 "polymorphic", args_sym->name, sym->name,
2924 &(args->expr->where));
2929 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2931 if (args_sym->attr.flavor != FL_PROCEDURE)
2933 /* TODO: Update this error message to allow for procedure
2934 pointers once they are implemented. */
2935 gfc_error_now ("Parameter '%s' to '%s' at %L must be a "
2937 args_sym->name, sym->name,
2938 &(args->expr->where));
2941 else if (args_sym->attr.is_bind_c != 1)
2943 gfc_error_now ("Parameter '%s' to '%s' at %L must be "
2945 args_sym->name, sym->name,
2946 &(args->expr->where));
2951 /* for c_loc/c_funloc, the new symbol is the same as the old one */
2956 gfc_internal_error ("gfc_iso_c_func_interface(): Unhandled "
2957 "iso_c_binding function: '%s'!\n", sym->name);
2964 /* Resolve a function call, which means resolving the arguments, then figuring
2965 out which entity the name refers to. */
2968 resolve_function (gfc_expr *expr)
2970 gfc_actual_arglist *arg;
2975 procedure_type p = PROC_INTRINSIC;
2976 bool no_formal_args;
2980 sym = expr->symtree->n.sym;
2982 /* If this is a procedure pointer component, it has already been resolved. */
2983 if (gfc_is_proc_ptr_comp (expr, NULL))
2986 if (sym && sym->attr.intrinsic
2987 && resolve_intrinsic (sym, &expr->where) == FAILURE)
2990 if (sym && (sym->attr.flavor == FL_VARIABLE || sym->attr.subroutine))
2992 gfc_error ("'%s' at %L is not a function", sym->name, &expr->where);
2996 /* If this ia a deferred TBP with an abstract interface (which may
2997 of course be referenced), expr->value.function.esym will be set. */
2998 if (sym && sym->attr.abstract && !expr->value.function.esym)
3000 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3001 sym->name, &expr->where);
3005 /* Switch off assumed size checking and do this again for certain kinds
3006 of procedure, once the procedure itself is resolved. */
3007 need_full_assumed_size++;
3009 if (expr->symtree && expr->symtree->n.sym)
3010 p = expr->symtree->n.sym->attr.proc;
3012 if (expr->value.function.isym && expr->value.function.isym->inquiry)
3013 inquiry_argument = true;
3014 no_formal_args = sym && is_external_proc (sym) && sym->formal == NULL;
3016 if (resolve_actual_arglist (expr->value.function.actual,
3017 p, no_formal_args) == FAILURE)
3019 inquiry_argument = false;
3023 inquiry_argument = false;
3025 /* Need to setup the call to the correct c_associated, depending on
3026 the number of cptrs to user gives to compare. */
3027 if (sym && sym->attr.is_iso_c == 1)
3029 if (gfc_iso_c_func_interface (sym, expr->value.function.actual, &sym)
3033 /* Get the symtree for the new symbol (resolved func).
3034 the old one will be freed later, when it's no longer used. */
3035 gfc_find_sym_tree (sym->name, sym->ns, 1, &(expr->symtree));
3038 /* Resume assumed_size checking. */
3039 need_full_assumed_size--;
3041 /* If the procedure is external, check for usage. */
3042 if (sym && is_external_proc (sym))
3043 resolve_global_procedure (sym, &expr->where,
3044 &expr->value.function.actual, 0);
3046 if (sym && sym->ts.type == BT_CHARACTER
3048 && sym->ts.u.cl->length == NULL
3050 && !sym->ts.deferred
3051 && expr->value.function.esym == NULL
3052 && !sym->attr.contained)
3054 /* Internal procedures are taken care of in resolve_contained_fntype. */
3055 gfc_error ("Function '%s' is declared CHARACTER(*) and cannot "
3056 "be used at %L since it is not a dummy argument",
3057 sym->name, &expr->where);
3061 /* See if function is already resolved. */
3063 if (expr->value.function.name != NULL)
3065 if (expr->ts.type == BT_UNKNOWN)
3071 /* Apply the rules of section 14.1.2. */
3073 switch (procedure_kind (sym))
3076 t = resolve_generic_f (expr);
3079 case PTYPE_SPECIFIC:
3080 t = resolve_specific_f (expr);
3084 t = resolve_unknown_f (expr);
3088 gfc_internal_error ("resolve_function(): bad function type");
3092 /* If the expression is still a function (it might have simplified),
3093 then we check to see if we are calling an elemental function. */
3095 if (expr->expr_type != EXPR_FUNCTION)
3098 temp = need_full_assumed_size;
3099 need_full_assumed_size = 0;
3101 if (resolve_elemental_actual (expr, NULL) == FAILURE)
3104 if (omp_workshare_flag
3105 && expr->value.function.esym
3106 && ! gfc_elemental (expr->value.function.esym))
3108 gfc_error ("User defined non-ELEMENTAL function '%s' at %L not allowed "
3109 "in WORKSHARE construct", expr->value.function.esym->name,
3114 #define GENERIC_ID expr->value.function.isym->id
3115 else if (expr->value.function.actual != NULL
3116 && expr->value.function.isym != NULL
3117 && GENERIC_ID != GFC_ISYM_LBOUND
3118 && GENERIC_ID != GFC_ISYM_LEN
3119 && GENERIC_ID != GFC_ISYM_LOC
3120 && GENERIC_ID != GFC_ISYM_PRESENT)
3122 /* Array intrinsics must also have the last upper bound of an
3123 assumed size array argument. UBOUND and SIZE have to be
3124 excluded from the check if the second argument is anything
3127 for (arg = expr->value.function.actual; arg; arg = arg->next)
3129 if ((GENERIC_ID == GFC_ISYM_UBOUND || GENERIC_ID == GFC_ISYM_SIZE)
3130 && arg->next != NULL && arg->next->expr)
3132 if (arg->next->expr->expr_type != EXPR_CONSTANT)
3135 if (arg->next->name && strncmp(arg->next->name, "kind", 4) == 0)
3138 if ((int)mpz_get_si (arg->next->expr->value.integer)
3143 if (arg->expr != NULL
3144 && arg->expr->rank > 0
3145 && resolve_assumed_size_actual (arg->expr))
3151 need_full_assumed_size = temp;
3154 if (!pure_function (expr, &name) && name)
3158 gfc_error ("Reference to non-PURE function '%s' at %L inside a "
3159 "FORALL %s", name, &expr->where,
3160 forall_flag == 2 ? "mask" : "block");
3163 else if (do_concurrent_flag)
3165 gfc_error ("Reference to non-PURE function '%s' at %L inside a "
3166 "DO CONCURRENT %s", name, &expr->where,
3167 do_concurrent_flag == 2 ? "mask" : "block");
3170 else if (gfc_pure (NULL))
3172 gfc_error ("Function reference to '%s' at %L is to a non-PURE "
3173 "procedure within a PURE procedure", name, &expr->where);
3178 if (!pure_function (expr, &name) && name && gfc_implicit_pure (NULL))
3179 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3181 /* Functions without the RECURSIVE attribution are not allowed to
3182 * call themselves. */
3183 if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
3186 esym = expr->value.function.esym;
3188 if (is_illegal_recursion (esym, gfc_current_ns))
3190 if (esym->attr.entry && esym->ns->entries)
3191 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3192 " function '%s' is not RECURSIVE",
3193 esym->name, &expr->where, esym->ns->entries->sym->name);
3195 gfc_error ("Function '%s' at %L cannot be called recursively, as it"
3196 " is not RECURSIVE", esym->name, &expr->where);
3202 /* Character lengths of use associated functions may contains references to
3203 symbols not referenced from the current program unit otherwise. Make sure
3204 those symbols are marked as referenced. */
3206 if (expr->ts.type == BT_CHARACTER && expr->value.function.esym
3207 && expr->value.function.esym->attr.use_assoc)
3209 gfc_expr_set_symbols_referenced (expr->ts.u.cl->length);
3212 /* Make sure that the expression has a typespec that works. */
3213 if (expr->ts.type == BT_UNKNOWN)
3215 if (expr->symtree->n.sym->result
3216 && expr->symtree->n.sym->result->ts.type != BT_UNKNOWN
3217 && !expr->symtree->n.sym->result->attr.proc_pointer)
3218 expr->ts = expr->symtree->n.sym->result->ts;
3225 /************* Subroutine resolution *************/
3228 pure_subroutine (gfc_code *c, gfc_symbol *sym)
3234 gfc_error ("Subroutine call to '%s' in FORALL block at %L is not PURE",
3235 sym->name, &c->loc);
3236 else if (do_concurrent_flag)
3237 gfc_error ("Subroutine call to '%s' in DO CONCURRENT block at %L is not "
3238 "PURE", sym->name, &c->loc);
3239 else if (gfc_pure (NULL))
3240 gfc_error ("Subroutine call to '%s' at %L is not PURE", sym->name,
3246 resolve_generic_s0 (gfc_code *c, gfc_symbol *sym)
3250 if (sym->attr.generic)
3252 s = gfc_search_interface (sym->generic, 1, &c->ext.actual);
3255 c->resolved_sym = s;
3256 pure_subroutine (c, s);
3260 /* TODO: Need to search for elemental references in generic interface. */
3263 if (sym->attr.intrinsic)
3264 return gfc_intrinsic_sub_interface (c, 0);
3271 resolve_generic_s (gfc_code *c)
3276 sym = c->symtree->n.sym;
3280 m = resolve_generic_s0 (c, sym);
3283 else if (m == MATCH_ERROR)
3287 if (sym->ns->parent == NULL)
3289 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3293 if (!generic_sym (sym))
3297 /* Last ditch attempt. See if the reference is to an intrinsic
3298 that possesses a matching interface. 14.1.2.4 */
3299 sym = c->symtree->n.sym;
3301 if (!gfc_is_intrinsic (sym, 1, c->loc))
3303 gfc_error ("There is no specific subroutine for the generic '%s' at %L",
3304 sym->name, &c->loc);
3308 m = gfc_intrinsic_sub_interface (c, 0);
3312 gfc_error ("Generic subroutine '%s' at %L is not consistent with an "
3313 "intrinsic subroutine interface", sym->name, &c->loc);
3319 /* Set the name and binding label of the subroutine symbol in the call
3320 expression represented by 'c' to include the type and kind of the
3321 second parameter. This function is for resolving the appropriate
3322 version of c_f_pointer() and c_f_procpointer(). For example, a
3323 call to c_f_pointer() for a default integer pointer could have a
3324 name of c_f_pointer_i4. If no second arg exists, which is an error
3325 for these two functions, it defaults to the generic symbol's name
3326 and binding label. */
3329 set_name_and_label (gfc_code *c, gfc_symbol *sym,
3330 char *name, char *binding_label)
3332 gfc_expr *arg = NULL;
3336 /* The second arg of c_f_pointer and c_f_procpointer determines
3337 the type and kind for the procedure name. */
3338 arg = c->ext.actual->next->expr;
3342 /* Set up the name to have the given symbol's name,
3343 plus the type and kind. */
3344 /* a derived type is marked with the type letter 'u' */
3345 if (arg->ts.type == BT_DERIVED)
3348 kind = 0; /* set the kind as 0 for now */
3352 type = gfc_type_letter (arg->ts.type);
3353 kind = arg->ts.kind;
3356 if (arg->ts.type == BT_CHARACTER)
3357 /* Kind info for character strings not needed. */
3360 sprintf (name, "%s_%c%d", sym->name, type, kind);
3361 /* Set up the binding label as the given symbol's label plus
3362 the type and kind. */
3363 sprintf (binding_label, "%s_%c%d", sym->binding_label, type, kind);
3367 /* If the second arg is missing, set the name and label as
3368 was, cause it should at least be found, and the missing
3369 arg error will be caught by compare_parameters(). */
3370 sprintf (name, "%s", sym->name);
3371 sprintf (binding_label, "%s", sym->binding_label);
3378 /* Resolve a generic version of the iso_c_binding procedure given
3379 (sym) to the specific one based on the type and kind of the
3380 argument(s). Currently, this function resolves c_f_pointer() and
3381 c_f_procpointer based on the type and kind of the second argument
3382 (FPTR). Other iso_c_binding procedures aren't specially handled.
3383 Upon successfully exiting, c->resolved_sym will hold the resolved
3384 symbol. Returns MATCH_ERROR if an error occurred; MATCH_YES
3388 gfc_iso_c_sub_interface (gfc_code *c, gfc_symbol *sym)
3390 gfc_symbol *new_sym;
3391 /* this is fine, since we know the names won't use the max */
3392 char name[GFC_MAX_SYMBOL_LEN + 1];
3393 char binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
3394 /* default to success; will override if find error */
3395 match m = MATCH_YES;
3397 /* Make sure the actual arguments are in the necessary order (based on the
3398 formal args) before resolving. */
3399 gfc_procedure_use (sym, &c->ext.actual, &(c->loc));
3401 if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER) ||
3402 (sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER))
3404 set_name_and_label (c, sym, name, binding_label);
3406 if (sym->intmod_sym_id == ISOCBINDING_F_POINTER)
3408 if (c->ext.actual != NULL && c->ext.actual->next != NULL)
3410 /* Make sure we got a third arg if the second arg has non-zero
3411 rank. We must also check that the type and rank are
3412 correct since we short-circuit this check in
3413 gfc_procedure_use() (called above to sort actual args). */
3414 if (c->ext.actual->next->expr->rank != 0)
3416 if(c->ext.actual->next->next == NULL
3417 || c->ext.actual->next->next->expr == NULL)
3420 gfc_error ("Missing SHAPE parameter for call to %s "
3421 "at %L", sym->name, &(c->loc));
3423 else if (c->ext.actual->next->next->expr->ts.type
3425 || c->ext.actual->next->next->expr->rank != 1)
3428 gfc_error ("SHAPE parameter for call to %s at %L must "
3429 "be a rank 1 INTEGER array", sym->name,
3436 if (m != MATCH_ERROR)
3438 /* the 1 means to add the optional arg to formal list */
3439 new_sym = get_iso_c_sym (sym, name, binding_label, 1);
3441 /* for error reporting, say it's declared where the original was */
3442 new_sym->declared_at = sym->declared_at;
3447 /* no differences for c_loc or c_funloc */
3451 /* set the resolved symbol */
3452 if (m != MATCH_ERROR)
3453 c->resolved_sym = new_sym;
3455 c->resolved_sym = sym;
3461 /* Resolve a subroutine call known to be specific. */
3464 resolve_specific_s0 (gfc_code *c, gfc_symbol *sym)
3468 if(sym->attr.is_iso_c)
3470 m = gfc_iso_c_sub_interface (c,sym);
3474 if (sym->attr.external || sym->attr.if_source == IFSRC_IFBODY)
3476 if (sym->attr.dummy)
3478 sym->attr.proc = PROC_DUMMY;
3482 sym->attr.proc = PROC_EXTERNAL;
3486 if (sym->attr.proc == PROC_MODULE || sym->attr.proc == PROC_INTERNAL)
3489 if (sym->attr.intrinsic)
3491 m = gfc_intrinsic_sub_interface (c, 1);
3495 gfc_error ("Subroutine '%s' at %L is INTRINSIC but is not compatible "
3496 "with an intrinsic", sym->name, &c->loc);
3504 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3506 c->resolved_sym = sym;
3507 pure_subroutine (c, sym);
3514 resolve_specific_s (gfc_code *c)
3519 sym = c->symtree->n.sym;
3523 m = resolve_specific_s0 (c, sym);
3526 if (m == MATCH_ERROR)
3529 if (sym->ns->parent == NULL)
3532 gfc_find_symbol (sym->name, sym->ns->parent, 1, &sym);
3538 sym = c->symtree->n.sym;
3539 gfc_error ("Unable to resolve the specific subroutine '%s' at %L",
3540 sym->name, &c->loc);
3546 /* Resolve a subroutine call not known to be generic nor specific. */
3549 resolve_unknown_s (gfc_code *c)
3553 sym = c->symtree->n.sym;
3555 if (sym->attr.dummy)
3557 sym->attr.proc = PROC_DUMMY;
3561 /* See if we have an intrinsic function reference. */
3563 if (gfc_is_intrinsic (sym, 1, c->loc))
3565 if (gfc_intrinsic_sub_interface (c, 1) == MATCH_YES)
3570 /* The reference is to an external name. */
3573 gfc_procedure_use (sym, &c->ext.actual, &c->loc);
3575 c->resolved_sym = sym;
3577 pure_subroutine (c, sym);
3583 /* Resolve a subroutine call. Although it was tempting to use the same code
3584 for functions, subroutines and functions are stored differently and this
3585 makes things awkward. */
3588 resolve_call (gfc_code *c)
3591 procedure_type ptype = PROC_INTRINSIC;
3592 gfc_symbol *csym, *sym;
3593 bool no_formal_args;
3595 csym = c->symtree ? c->symtree->n.sym : NULL;
3597 if (csym && csym->ts.type != BT_UNKNOWN)
3599 gfc_error ("'%s' at %L has a type, which is not consistent with "
3600 "the CALL at %L", csym->name, &csym->declared_at, &c->loc);
3604 if (csym && gfc_current_ns->parent && csym->ns != gfc_current_ns)
3607 gfc_find_sym_tree (csym->name, gfc_current_ns, 1, &st);
3608 sym = st ? st->n.sym : NULL;
3609 if (sym && csym != sym
3610 && sym->ns == gfc_current_ns
3611 && sym->attr.flavor == FL_PROCEDURE
3612 && sym->attr.contained)
3615 if (csym->attr.generic)
3616 c->symtree->n.sym = sym;
3619 csym = c->symtree->n.sym;
3623 /* If this ia a deferred TBP with an abstract interface
3624 (which may of course be referenced), c->expr1 will be set. */
3625 if (csym && csym->attr.abstract && !c->expr1)
3627 gfc_error ("ABSTRACT INTERFACE '%s' must not be referenced at %L",
3628 csym->name, &c->loc);
3632 /* Subroutines without the RECURSIVE attribution are not allowed to
3633 * call themselves. */
3634 if (csym && is_illegal_recursion (csym, gfc_current_ns))
3636 if (csym->attr.entry && csym->ns->entries)
3637 gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
3638 " subroutine '%s' is not RECURSIVE",
3639 csym->name, &c->loc, csym->ns->entries->sym->name);
3641 gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
3642 " is not RECURSIVE", csym->name, &c->loc);
3647 /* Switch off assumed size checking and do this again for certain kinds
3648 of procedure, once the procedure itself is resolved. */
3649 need_full_assumed_size++;
3652 ptype = csym->attr.proc;
3654 no_formal_args = csym && is_external_proc (csym) && csym->formal == NULL;
3655 if (resolve_actual_arglist (c->ext.actual, ptype,
3656 no_formal_args) == FAILURE)
3659 /* Resume assumed_size checking. */
3660 need_full_assumed_size--;
3662 /* If external, check for usage. */
3663 if (csym && is_external_proc (csym))
3664 resolve_global_procedure (csym, &c->loc, &c->ext.actual, 1);
3667 if (c->resolved_sym == NULL)
3669 c->resolved_isym = NULL;
3670 switch (procedure_kind (csym))
3673 t = resolve_generic_s (c);
3676 case PTYPE_SPECIFIC:
3677 t = resolve_specific_s (c);
3681 t = resolve_unknown_s (c);
3685 gfc_internal_error ("resolve_subroutine(): bad function type");
3689 /* Some checks of elemental subroutine actual arguments. */
3690 if (resolve_elemental_actual (NULL, c) == FAILURE)
3697 /* Compare the shapes of two arrays that have non-NULL shapes. If both
3698 op1->shape and op2->shape are non-NULL return SUCCESS if their shapes
3699 match. If both op1->shape and op2->shape are non-NULL return FAILURE
3700 if their shapes do not match. If either op1->shape or op2->shape is
3701 NULL, return SUCCESS. */
3704 compare_shapes (gfc_expr *op1, gfc_expr *op2)
3711 if (op1->shape != NULL && op2->shape != NULL)
3713 for (i = 0; i < op1->rank; i++)
3715 if (mpz_cmp (op1->shape[i], op2->shape[i]) != 0)
3717 gfc_error ("Shapes for operands at %L and %L are not conformable",
3718 &op1->where, &op2->where);
3729 /* Resolve an operator expression node. This can involve replacing the
3730 operation with a user defined function call. */
3733 resolve_operator (gfc_expr *e)
3735 gfc_expr *op1, *op2;
3737 bool dual_locus_error;
3740 /* Resolve all subnodes-- give them types. */
3742 switch (e->value.op.op)
3745 if (gfc_resolve_expr (e->value.op.op2) == FAILURE)
3748 /* Fall through... */
3751 case INTRINSIC_UPLUS:
3752 case INTRINSIC_UMINUS:
3753 case INTRINSIC_PARENTHESES:
3754 if (gfc_resolve_expr (e->value.op.op1) == FAILURE)
3759 /* Typecheck the new node. */
3761 op1 = e->value.op.op1;
3762 op2 = e->value.op.op2;
3763 dual_locus_error = false;
3765 if ((op1 && op1->expr_type == EXPR_NULL)
3766 || (op2 && op2->expr_type == EXPR_NULL))
3768 sprintf (msg, _("Invalid context for NULL() pointer at %%L"));
3772 switch (e->value.op.op)
3774 case INTRINSIC_UPLUS:
3775 case INTRINSIC_UMINUS:
3776 if (op1->ts.type == BT_INTEGER
3777 || op1->ts.type == BT_REAL
3778 || op1->ts.type == BT_COMPLEX)
3784 sprintf (msg, _("Operand of unary numeric operator '%s' at %%L is %s"),
3785 gfc_op2string (e->value.op.op), gfc_typename (&e->ts));
3788 case INTRINSIC_PLUS:
3789 case INTRINSIC_MINUS:
3790 case INTRINSIC_TIMES:
3791 case INTRINSIC_DIVIDE:
3792 case INTRINSIC_POWER:
3793 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3795 gfc_type_convert_binary (e, 1);
3800 _("Operands of binary numeric operator '%s' at %%L are %s/%s"),
3801 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3802 gfc_typename (&op2->ts));
3805 case INTRINSIC_CONCAT:
3806 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3807 && op1->ts.kind == op2->ts.kind)
3809 e->ts.type = BT_CHARACTER;
3810 e->ts.kind = op1->ts.kind;
3815 _("Operands of string concatenation operator at %%L are %s/%s"),
3816 gfc_typename (&op1->ts), gfc_typename (&op2->ts));
3822 case INTRINSIC_NEQV:
3823 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3825 e->ts.type = BT_LOGICAL;
3826 e->ts.kind = gfc_kind_max (op1, op2);
3827 if (op1->ts.kind < e->ts.kind)
3828 gfc_convert_type (op1, &e->ts, 2);
3829 else if (op2->ts.kind < e->ts.kind)
3830 gfc_convert_type (op2, &e->ts, 2);
3834 sprintf (msg, _("Operands of logical operator '%s' at %%L are %s/%s"),
3835 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3836 gfc_typename (&op2->ts));
3841 if (op1->ts.type == BT_LOGICAL)
3843 e->ts.type = BT_LOGICAL;
3844 e->ts.kind = op1->ts.kind;
3848 sprintf (msg, _("Operand of .not. operator at %%L is %s"),
3849 gfc_typename (&op1->ts));
3853 case INTRINSIC_GT_OS:
3855 case INTRINSIC_GE_OS:
3857 case INTRINSIC_LT_OS:
3859 case INTRINSIC_LE_OS:
3860 if (op1->ts.type == BT_COMPLEX || op2->ts.type == BT_COMPLEX)
3862 strcpy (msg, _("COMPLEX quantities cannot be compared at %L"));
3866 /* Fall through... */
3869 case INTRINSIC_EQ_OS:
3871 case INTRINSIC_NE_OS:
3872 if (op1->ts.type == BT_CHARACTER && op2->ts.type == BT_CHARACTER
3873 && op1->ts.kind == op2->ts.kind)
3875 e->ts.type = BT_LOGICAL;
3876 e->ts.kind = gfc_default_logical_kind;
3880 if (gfc_numeric_ts (&op1->ts) && gfc_numeric_ts (&op2->ts))
3882 gfc_type_convert_binary (e, 1);
3884 e->ts.type = BT_LOGICAL;
3885 e->ts.kind = gfc_default_logical_kind;
3889 if (op1->ts.type == BT_LOGICAL && op2->ts.type == BT_LOGICAL)
3891 _("Logicals at %%L must be compared with %s instead of %s"),
3892 (e->value.op.op == INTRINSIC_EQ
3893 || e->value.op.op == INTRINSIC_EQ_OS)
3894 ? ".eqv." : ".neqv.", gfc_op2string (e->value.op.op));
3897 _("Operands of comparison operator '%s' at %%L are %s/%s"),
3898 gfc_op2string (e->value.op.op), gfc_typename (&op1->ts),
3899 gfc_typename (&op2->ts));
3903 case INTRINSIC_USER:
3904 if (e->value.op.uop->op == NULL)
3905 sprintf (msg, _("Unknown operator '%s' at %%L"), e->value.op.uop->name);
3906 else if (op2 == NULL)
3907 sprintf (msg, _("Operand of user operator '%s' at %%L is %s"),
3908 e->value.op.uop->name, gfc_typename (&op1->ts));
3911 sprintf (msg, _("Operands of user operator '%s' at %%L are %s/%s"),
3912 e->value.op.uop->name, gfc_typename (&op1->ts),
3913 gfc_typename (&op2->ts));
3914 e->value.op.uop->op->sym->attr.referenced = 1;
3919 case INTRINSIC_PARENTHESES:
3921 if (e->ts.type == BT_CHARACTER)
3922 e->ts.u.cl = op1->ts.u.cl;
3926 gfc_internal_error ("resolve_operator(): Bad intrinsic");
3929 /* Deal with arrayness of an operand through an operator. */
3933 switch (e->value.op.op)
3935 case INTRINSIC_PLUS:
3936 case INTRINSIC_MINUS:
3937 case INTRINSIC_TIMES:
3938 case INTRINSIC_DIVIDE:
3939 case INTRINSIC_POWER:
3940 case INTRINSIC_CONCAT:
3944 case INTRINSIC_NEQV:
3946 case INTRINSIC_EQ_OS:
3948 case INTRINSIC_NE_OS:
3950 case INTRINSIC_GT_OS:
3952 case INTRINSIC_GE_OS:
3954 case INTRINSIC_LT_OS:
3956 case INTRINSIC_LE_OS:
3958 if (op1->rank == 0 && op2->rank == 0)
3961 if (op1->rank == 0 && op2->rank != 0)
3963 e->rank = op2->rank;
3965 if (e->shape == NULL)
3966 e->shape = gfc_copy_shape (op2->shape, op2->rank);
3969 if (op1->rank != 0 && op2->rank == 0)
3971 e->rank = op1->rank;
3973 if (e->shape == NULL)
3974 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3977 if (op1->rank != 0 && op2->rank != 0)
3979 if (op1->rank == op2->rank)
3981 e->rank = op1->rank;
3982 if (e->shape == NULL)
3984 t = compare_shapes (op1, op2);
3988 e->shape = gfc_copy_shape (op1->shape, op1->rank);
3993 /* Allow higher level expressions to work. */
3996 /* Try user-defined operators, and otherwise throw an error. */
3997 dual_locus_error = true;
3999 _("Inconsistent ranks for operator at %%L and %%L"));
4006 case INTRINSIC_PARENTHESES:
4008 case INTRINSIC_UPLUS:
4009 case INTRINSIC_UMINUS:
4010 /* Simply copy arrayness attribute */
4011 e->rank = op1->rank;
4013 if (e->shape == NULL)
4014 e->shape = gfc_copy_shape (op1->shape, op1->rank);
4022 /* Attempt to simplify the expression. */
4025 t = gfc_simplify_expr (e, 0);
4026 /* Some calls do not succeed in simplification and return FAILURE
4027 even though there is no error; e.g. variable references to
4028 PARAMETER arrays. */
4029 if (!gfc_is_constant_expr (e))
4037 match m = gfc_extend_expr (e);
4040 if (m == MATCH_ERROR)
4044 if (dual_locus_error)
4045 gfc_error (msg, &op1->where, &op2->where);
4047 gfc_error (msg, &e->where);
4053 /************** Array resolution subroutines **************/
4056 { CMP_LT, CMP_EQ, CMP_GT, CMP_UNKNOWN }
4059 /* Compare two integer expressions. */
4062 compare_bound (gfc_expr *a, gfc_expr *b)
4066 if (a == NULL || a->expr_type != EXPR_CONSTANT
4067 || b == NULL || b->expr_type != EXPR_CONSTANT)
4070 /* If either of the types isn't INTEGER, we must have
4071 raised an error earlier. */
4073 if (a->ts.type != BT_INTEGER || b->ts.type != BT_INTEGER)
4076 i = mpz_cmp (a->value.integer, b->value.integer);
4086 /* Compare an integer expression with an integer. */
4089 compare_bound_int (gfc_expr *a, int b)
4093 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4096 if (a->ts.type != BT_INTEGER)
4097 gfc_internal_error ("compare_bound_int(): Bad expression");
4099 i = mpz_cmp_si (a->value.integer, b);
4109 /* Compare an integer expression with a mpz_t. */
4112 compare_bound_mpz_t (gfc_expr *a, mpz_t b)
4116 if (a == NULL || a->expr_type != EXPR_CONSTANT)
4119 if (a->ts.type != BT_INTEGER)
4120 gfc_internal_error ("compare_bound_int(): Bad expression");
4122 i = mpz_cmp (a->value.integer, b);
4132 /* Compute the last value of a sequence given by a triplet.
4133 Return 0 if it wasn't able to compute the last value, or if the
4134 sequence if empty, and 1 otherwise. */
4137 compute_last_value_for_triplet (gfc_expr *start, gfc_expr *end,
4138 gfc_expr *stride, mpz_t last)
4142 if (start == NULL || start->expr_type != EXPR_CONSTANT
4143 || end == NULL || end->expr_type != EXPR_CONSTANT
4144 || (stride != NULL && stride->expr_type != EXPR_CONSTANT))
4147 if (start->ts.type != BT_INTEGER || end->ts.type != BT_INTEGER
4148 || (stride != NULL && stride->ts.type != BT_INTEGER))
4151 if (stride == NULL || compare_bound_int(stride, 1) == CMP_EQ)
4153 if (compare_bound (start, end) == CMP_GT)
4155 mpz_set (last, end->value.integer);
4159 if (compare_bound_int (stride, 0) == CMP_GT)
4161 /* Stride is positive */
4162 if (mpz_cmp (start->value.integer, end->value.integer) > 0)
4167 /* Stride is negative */
4168 if (mpz_cmp (start->value.integer, end->value.integer) < 0)
4173 mpz_sub (rem, end->value.integer, start->value.integer);
4174 mpz_tdiv_r (rem, rem, stride->value.integer);
4175 mpz_sub (last, end->value.integer, rem);
4182 /* Compare a single dimension of an array reference to the array
4186 check_dimension (int i, gfc_array_ref *ar, gfc_array_spec *as)
4190 if (ar->dimen_type[i] == DIMEN_STAR)
4192 gcc_assert (ar->stride[i] == NULL);
4193 /* This implies [*] as [*:] and [*:3] are not possible. */
4194 if (ar->start[i] == NULL)
4196 gcc_assert (ar->end[i] == NULL);
4201 /* Given start, end and stride values, calculate the minimum and
4202 maximum referenced indexes. */
4204 switch (ar->dimen_type[i])
4207 case DIMEN_THIS_IMAGE:
4212 if (compare_bound (ar->start[i], as->lower[i]) == CMP_LT)
4215 gfc_warning ("Array reference at %L is out of bounds "
4216 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4217 mpz_get_si (ar->start[i]->value.integer),
4218 mpz_get_si (as->lower[i]->value.integer), i+1);
4220 gfc_warning ("Array reference at %L is out of bounds "
4221 "(%ld < %ld) in codimension %d", &ar->c_where[i],
4222 mpz_get_si (ar->start[i]->value.integer),
4223 mpz_get_si (as->lower[i]->value.integer),
4227 if (compare_bound (ar->start[i], as->upper[i]) == CMP_GT)
4230 gfc_warning ("Array reference at %L is out of bounds "
4231 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4232 mpz_get_si (ar->start[i]->value.integer),
4233 mpz_get_si (as->upper[i]->value.integer), i+1);
4235 gfc_warning ("Array reference at %L is out of bounds "
4236 "(%ld > %ld) in codimension %d", &ar->c_where[i],
4237 mpz_get_si (ar->start[i]->value.integer),
4238 mpz_get_si (as->upper[i]->value.integer),
4247 #define AR_START (ar->start[i] ? ar->start[i] : as->lower[i])
4248 #define AR_END (ar->end[i] ? ar->end[i] : as->upper[i])
4250 comparison comp_start_end = compare_bound (AR_START, AR_END);
4252 /* Check for zero stride, which is not allowed. */
4253 if (compare_bound_int (ar->stride[i], 0) == CMP_EQ)
4255 gfc_error ("Illegal stride of zero at %L", &ar->c_where[i]);
4259 /* if start == len || (stride > 0 && start < len)
4260 || (stride < 0 && start > len),
4261 then the array section contains at least one element. In this
4262 case, there is an out-of-bounds access if
4263 (start < lower || start > upper). */
4264 if (compare_bound (AR_START, AR_END) == CMP_EQ
4265 || ((compare_bound_int (ar->stride[i], 0) == CMP_GT
4266 || ar->stride[i] == NULL) && comp_start_end == CMP_LT)
4267 || (compare_bound_int (ar->stride[i], 0) == CMP_LT
4268 && comp_start_end == CMP_GT))
4270 if (compare_bound (AR_START, as->lower[i]) == CMP_LT)
4272 gfc_warning ("Lower array reference at %L is out of bounds "
4273 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4274 mpz_get_si (AR_START->value.integer),
4275 mpz_get_si (as->lower[i]->value.integer), i+1);
4278 if (compare_bound (AR_START, as->upper[i]) == CMP_GT)
4280 gfc_warning ("Lower array reference at %L is out of bounds "
4281 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4282 mpz_get_si (AR_START->value.integer),
4283 mpz_get_si (as->upper[i]->value.integer), i+1);
4288 /* If we can compute the highest index of the array section,
4289 then it also has to be between lower and upper. */
4290 mpz_init (last_value);
4291 if (compute_last_value_for_triplet (AR_START, AR_END, ar->stride[i],
4294 if (compare_bound_mpz_t (as->lower[i], last_value) == CMP_GT)
4296 gfc_warning ("Upper array reference at %L is out of bounds "
4297 "(%ld < %ld) in dimension %d", &ar->c_where[i],
4298 mpz_get_si (last_value),
4299 mpz_get_si (as->lower[i]->value.integer), i+1);
4300 mpz_clear (last_value);
4303 if (compare_bound_mpz_t (as->upper[i], last_value) == CMP_LT)
4305 gfc_warning ("Upper array reference at %L is out of bounds "
4306 "(%ld > %ld) in dimension %d", &ar->c_where[i],
4307 mpz_get_si (last_value),
4308 mpz_get_si (as->upper[i]->value.integer), i+1);
4309 mpz_clear (last_value);
4313 mpz_clear (last_value);
4321 gfc_internal_error ("check_dimension(): Bad array reference");
4328 /* Compare an array reference with an array specification. */
4331 compare_spec_to_ref (gfc_array_ref *ar)
4338 /* TODO: Full array sections are only allowed as actual parameters. */
4339 if (as->type == AS_ASSUMED_SIZE
4340 && (/*ar->type == AR_FULL
4341 ||*/ (ar->type == AR_SECTION
4342 && ar->dimen_type[i] == DIMEN_RANGE && ar->end[i] == NULL)))
4344 gfc_error ("Rightmost upper bound of assumed size array section "
4345 "not specified at %L", &ar->where);
4349 if (ar->type == AR_FULL)
4352 if (as->rank != ar->dimen)
4354 gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
4355 &ar->where, ar->dimen, as->rank);
4359 /* ar->codimen == 0 is a local array. */
4360 if (as->corank != ar->codimen && ar->codimen != 0)
4362 gfc_error ("Coindex rank mismatch in array reference at %L (%d/%d)",
4363 &ar->where, ar->codimen, as->corank);
4367 for (i = 0; i < as->rank; i++)
4368 if (check_dimension (i, ar, as) == FAILURE)
4371 /* Local access has no coarray spec. */
4372 if (ar->codimen != 0)
4373 for (i = as->rank; i < as->rank + as->corank; i++)
4375 if (ar->dimen_type[i] != DIMEN_ELEMENT && !ar->in_allocate
4376 && ar->dimen_type[i] != DIMEN_THIS_IMAGE)
4378 gfc_error ("Coindex of codimension %d must be a scalar at %L",
4379 i + 1 - as->rank, &ar->where);
4382 if (check_dimension (i, ar, as) == FAILURE)
4390 /* Resolve one part of an array index. */
4393 gfc_resolve_index_1 (gfc_expr *index, int check_scalar,
4394 int force_index_integer_kind)
4401 if (gfc_resolve_expr (index) == FAILURE)
4404 if (check_scalar && index->rank != 0)
4406 gfc_error ("Array index at %L must be scalar", &index->where);
4410 if (index->ts.type != BT_INTEGER && index->ts.type != BT_REAL)
4412 gfc_error ("Array index at %L must be of INTEGER type, found %s",
4413 &index->where, gfc_basic_typename (index->ts.type));
4417 if (index->ts.type == BT_REAL)
4418 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: REAL array index at %L",
4419 &index->where) == FAILURE)
4422 if ((index->ts.kind != gfc_index_integer_kind
4423 && force_index_integer_kind)
4424 || index->ts.type != BT_INTEGER)
4427 ts.type = BT_INTEGER;
4428 ts.kind = gfc_index_integer_kind;
4430 gfc_convert_type_warn (index, &ts, 2, 0);
4436 /* Resolve one part of an array index. */
4439 gfc_resolve_index (gfc_expr *index, int check_scalar)
4441 return gfc_resolve_index_1 (index, check_scalar, 1);
4444 /* Resolve a dim argument to an intrinsic function. */
4447 gfc_resolve_dim_arg (gfc_expr *dim)
4452 if (gfc_resolve_expr (dim) == FAILURE)
4457 gfc_error ("Argument dim at %L must be scalar", &dim->where);
4462 if (dim->ts.type != BT_INTEGER)
4464 gfc_error ("Argument dim at %L must be of INTEGER type", &dim->where);
4468 if (dim->ts.kind != gfc_index_integer_kind)
4473 ts.type = BT_INTEGER;
4474 ts.kind = gfc_index_integer_kind;
4476 gfc_convert_type_warn (dim, &ts, 2, 0);
4482 /* Given an expression that contains array references, update those array
4483 references to point to the right array specifications. While this is
4484 filled in during matching, this information is difficult to save and load
4485 in a module, so we take care of it here.
4487 The idea here is that the original array reference comes from the
4488 base symbol. We traverse the list of reference structures, setting
4489 the stored reference to references. Component references can
4490 provide an additional array specification. */
4493 find_array_spec (gfc_expr *e)
4497 gfc_symbol *derived;
4500 if (e->symtree->n.sym->ts.type == BT_CLASS)
4501 as = CLASS_DATA (e->symtree->n.sym)->as;
4503 as = e->symtree->n.sym->as;
4506 for (ref = e->ref; ref; ref = ref->next)
4511 gfc_internal_error ("find_array_spec(): Missing spec");
4518 if (derived == NULL)
4519 derived = e->symtree->n.sym->ts.u.derived;
4521 if (derived->attr.is_class)
4522 derived = derived->components->ts.u.derived;
4524 c = derived->components;
4526 for (; c; c = c->next)
4527 if (c == ref->u.c.component)
4529 /* Track the sequence of component references. */
4530 if (c->ts.type == BT_DERIVED)
4531 derived = c->ts.u.derived;
4536 gfc_internal_error ("find_array_spec(): Component not found");
4538 if (c->attr.dimension)
4541 gfc_internal_error ("find_array_spec(): unused as(1)");
4552 gfc_internal_error ("find_array_spec(): unused as(2)");
4556 /* Resolve an array reference. */
4559 resolve_array_ref (gfc_array_ref *ar)
4561 int i, check_scalar;
4564 for (i = 0; i < ar->dimen + ar->codimen; i++)
4566 check_scalar = ar->dimen_type[i] == DIMEN_RANGE;
4568 /* Do not force gfc_index_integer_kind for the start. We can
4569 do fine with any integer kind. This avoids temporary arrays
4570 created for indexing with a vector. */
4571 if (gfc_resolve_index_1 (ar->start[i], check_scalar, 0) == FAILURE)
4573 if (gfc_resolve_index (ar->end[i], check_scalar) == FAILURE)
4575 if (gfc_resolve_index (ar->stride[i], check_scalar) == FAILURE)
4580 if (ar->dimen_type[i] == DIMEN_UNKNOWN)
4584 ar->dimen_type[i] = DIMEN_ELEMENT;
4588 ar->dimen_type[i] = DIMEN_VECTOR;
4589 if (e->expr_type == EXPR_VARIABLE
4590 && e->symtree->n.sym->ts.type == BT_DERIVED)
4591 ar->start[i] = gfc_get_parentheses (e);
4595 gfc_error ("Array index at %L is an array of rank %d",
4596 &ar->c_where[i], e->rank);
4600 /* Fill in the upper bound, which may be lower than the
4601 specified one for something like a(2:10:5), which is
4602 identical to a(2:7:5). Only relevant for strides not equal
4603 to one. Don't try a division by zero. */
4604 if (ar->dimen_type[i] == DIMEN_RANGE
4605 && ar->stride[i] != NULL && ar->stride[i]->expr_type == EXPR_CONSTANT
4606 && mpz_cmp_si (ar->stride[i]->value.integer, 1L) != 0
4607 && mpz_cmp_si (ar->stride[i]->value.integer, 0L) != 0)
4611 if (gfc_ref_dimen_size (ar, i, &size, &end) == SUCCESS)
4613 if (ar->end[i] == NULL)
4616 gfc_get_constant_expr (BT_INTEGER, gfc_index_integer_kind,
4618 mpz_set (ar->end[i]->value.integer, end);
4620 else if (ar->end[i]->ts.type == BT_INTEGER
4621 && ar->end[i]->expr_type == EXPR_CONSTANT)
4623 mpz_set (ar->end[i]->value.integer, end);
4634 if (ar->type == AR_FULL)
4636 if (ar->as->rank == 0)
4637 ar->type = AR_ELEMENT;
4639 /* Make sure array is the same as array(:,:), this way
4640 we don't need to special case all the time. */
4641 ar->dimen = ar->as->rank;
4642 for (i = 0; i < ar->dimen; i++)
4644 ar->dimen_type[i] = DIMEN_RANGE;
4646 gcc_assert (ar->start[i] == NULL);
4647 gcc_assert (ar->end[i] == NULL);
4648 gcc_assert (ar->stride[i] == NULL);
4652 /* If the reference type is unknown, figure out what kind it is. */
4654 if (ar->type == AR_UNKNOWN)
4656 ar->type = AR_ELEMENT;
4657 for (i = 0; i < ar->dimen; i++)
4658 if (ar->dimen_type[i] == DIMEN_RANGE
4659 || ar->dimen_type[i] == DIMEN_VECTOR)
4661 ar->type = AR_SECTION;
4666 if (!ar->as->cray_pointee && compare_spec_to_ref (ar) == FAILURE)
4669 if (ar->as->corank && ar->codimen == 0)
4672 ar->codimen = ar->as->corank;
4673 for (n = ar->dimen; n < ar->dimen + ar->codimen; n++)
4674 ar->dimen_type[n] = DIMEN_THIS_IMAGE;
4682 resolve_substring (gfc_ref *ref)
4684 int k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
4686 if (ref->u.ss.start != NULL)
4688 if (gfc_resolve_expr (ref->u.ss.start) == FAILURE)
4691 if (ref->u.ss.start->ts.type != BT_INTEGER)
4693 gfc_error ("Substring start index at %L must be of type INTEGER",
4694 &ref->u.ss.start->where);
4698 if (ref->u.ss.start->rank != 0)
4700 gfc_error ("Substring start index at %L must be scalar",
4701 &ref->u.ss.start->where);
4705 if (compare_bound_int (ref->u.ss.start, 1) == CMP_LT
4706 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4707 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4709 gfc_error ("Substring start index at %L is less than one",
4710 &ref->u.ss.start->where);
4715 if (ref->u.ss.end != NULL)
4717 if (gfc_resolve_expr (ref->u.ss.end) == FAILURE)
4720 if (ref->u.ss.end->ts.type != BT_INTEGER)
4722 gfc_error ("Substring end index at %L must be of type INTEGER",
4723 &ref->u.ss.end->where);
4727 if (ref->u.ss.end->rank != 0)
4729 gfc_error ("Substring end index at %L must be scalar",
4730 &ref->u.ss.end->where);
4734 if (ref->u.ss.length != NULL
4735 && compare_bound (ref->u.ss.end, ref->u.ss.length->length) == CMP_GT
4736 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4737 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4739 gfc_error ("Substring end index at %L exceeds the string length",
4740 &ref->u.ss.start->where);
4744 if (compare_bound_mpz_t (ref->u.ss.end,
4745 gfc_integer_kinds[k].huge) == CMP_GT
4746 && (compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_EQ
4747 || compare_bound (ref->u.ss.end, ref->u.ss.start) == CMP_GT))
4749 gfc_error ("Substring end index at %L is too large",
4750 &ref->u.ss.end->where);
4759 /* This function supplies missing substring charlens. */
4762 gfc_resolve_substring_charlen (gfc_expr *e)
4765 gfc_expr *start, *end;
4767 for (char_ref = e->ref; char_ref; char_ref = char_ref->next)
4768 if (char_ref->type == REF_SUBSTRING)
4774 gcc_assert (char_ref->next == NULL);
4778 if (e->ts.u.cl->length)
4779 gfc_free_expr (e->ts.u.cl->length);
4780 else if (e->expr_type == EXPR_VARIABLE
4781 && e->symtree->n.sym->attr.dummy)
4785 e->ts.type = BT_CHARACTER;
4786 e->ts.kind = gfc_default_character_kind;
4789 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
4791 if (char_ref->u.ss.start)
4792 start = gfc_copy_expr (char_ref->u.ss.start);
4794 start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4796 if (char_ref->u.ss.end)
4797 end = gfc_copy_expr (char_ref->u.ss.end);
4798 else if (e->expr_type == EXPR_VARIABLE)
4799 end = gfc_copy_expr (e->symtree->n.sym->ts.u.cl->length);
4806 /* Length = (end - start +1). */
4807 e->ts.u.cl->length = gfc_subtract (end, start);
4808 e->ts.u.cl->length = gfc_add (e->ts.u.cl->length,
4809 gfc_get_int_expr (gfc_default_integer_kind,
4812 e->ts.u.cl->length->ts.type = BT_INTEGER;
4813 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
4815 /* Make sure that the length is simplified. */
4816 gfc_simplify_expr (e->ts.u.cl->length, 1);
4817 gfc_resolve_expr (e->ts.u.cl->length);
4821 /* Resolve subtype references. */
4824 resolve_ref (gfc_expr *expr)
4826 int current_part_dimension, n_components, seen_part_dimension;
4829 for (ref = expr->ref; ref; ref = ref->next)
4830 if (ref->type == REF_ARRAY && ref->u.ar.as == NULL)
4832 find_array_spec (expr);
4836 for (ref = expr->ref; ref; ref = ref->next)
4840 if (resolve_array_ref (&ref->u.ar) == FAILURE)
4848 if (resolve_substring (ref) == FAILURE)
4853 /* Check constraints on part references. */
4855 current_part_dimension = 0;
4856 seen_part_dimension = 0;
4859 for (ref = expr->ref; ref; ref = ref->next)
4864 switch (ref->u.ar.type)
4867 /* Coarray scalar. */
4868 if (ref->u.ar.as->rank == 0)
4870 current_part_dimension = 0;
4875 current_part_dimension = 1;
4879 current_part_dimension = 0;
4883 gfc_internal_error ("resolve_ref(): Bad array reference");
4889 if (current_part_dimension || seen_part_dimension)
4892 if (ref->u.c.component->attr.pointer
4893 || ref->u.c.component->attr.proc_pointer)
4895 gfc_error ("Component to the right of a part reference "
4896 "with nonzero rank must not have the POINTER "
4897 "attribute at %L", &expr->where);
4900 else if (ref->u.c.component->attr.allocatable)
4902 gfc_error ("Component to the right of a part reference "
4903 "with nonzero rank must not have the ALLOCATABLE "
4904 "attribute at %L", &expr->where);
4916 if (((ref->type == REF_COMPONENT && n_components > 1)
4917 || ref->next == NULL)
4918 && current_part_dimension
4919 && seen_part_dimension)
4921 gfc_error ("Two or more part references with nonzero rank must "
4922 "not be specified at %L", &expr->where);
4926 if (ref->type == REF_COMPONENT)
4928 if (current_part_dimension)
4929 seen_part_dimension = 1;
4931 /* reset to make sure */
4932 current_part_dimension = 0;
4940 /* Given an expression, determine its shape. This is easier than it sounds.
4941 Leaves the shape array NULL if it is not possible to determine the shape. */
4944 expression_shape (gfc_expr *e)
4946 mpz_t array[GFC_MAX_DIMENSIONS];
4949 if (e->rank == 0 || e->shape != NULL)
4952 for (i = 0; i < e->rank; i++)
4953 if (gfc_array_dimen_size (e, i, &array[i]) == FAILURE)
4956 e->shape = gfc_get_shape (e->rank);
4958 memcpy (e->shape, array, e->rank * sizeof (mpz_t));
4963 for (i--; i >= 0; i--)
4964 mpz_clear (array[i]);
4968 /* Given a variable expression node, compute the rank of the expression by
4969 examining the base symbol and any reference structures it may have. */
4972 expression_rank (gfc_expr *e)
4977 /* Just to make sure, because EXPR_COMPCALL's also have an e->ref and that
4978 could lead to serious confusion... */
4979 gcc_assert (e->expr_type != EXPR_COMPCALL);
4983 if (e->expr_type == EXPR_ARRAY)
4985 /* Constructors can have a rank different from one via RESHAPE(). */
4987 if (e->symtree == NULL)
4993 e->rank = (e->symtree->n.sym->as == NULL)
4994 ? 0 : e->symtree->n.sym->as->rank;
5000 for (ref = e->ref; ref; ref = ref->next)
5002 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.proc_pointer
5003 && ref->u.c.component->attr.function && !ref->next)
5004 rank = ref->u.c.component->as ? ref->u.c.component->as->rank : 0;
5006 if (ref->type != REF_ARRAY)
5009 if (ref->u.ar.type == AR_FULL)
5011 rank = ref->u.ar.as->rank;
5015 if (ref->u.ar.type == AR_SECTION)
5017 /* Figure out the rank of the section. */
5019 gfc_internal_error ("expression_rank(): Two array specs");
5021 for (i = 0; i < ref->u.ar.dimen; i++)
5022 if (ref->u.ar.dimen_type[i] == DIMEN_RANGE
5023 || ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
5033 expression_shape (e);
5037 /* Resolve a variable expression. */
5040 resolve_variable (gfc_expr *e)
5047 if (e->symtree == NULL)
5049 sym = e->symtree->n.sym;
5051 /* If this is an associate-name, it may be parsed with an array reference
5052 in error even though the target is scalar. Fail directly in this case. */
5053 if (sym->assoc && !sym->attr.dimension && e->ref && e->ref->type == REF_ARRAY)
5056 /* On the other hand, the parser may not have known this is an array;
5057 in this case, we have to add a FULL reference. */
5058 if (sym->assoc && sym->attr.dimension && !e->ref)
5060 e->ref = gfc_get_ref ();
5061 e->ref->type = REF_ARRAY;
5062 e->ref->u.ar.type = AR_FULL;
5063 e->ref->u.ar.dimen = 0;
5066 if (e->ref && resolve_ref (e) == FAILURE)
5069 if (sym->attr.flavor == FL_PROCEDURE
5070 && (!sym->attr.function
5071 || (sym->attr.function && sym->result
5072 && sym->result->attr.proc_pointer
5073 && !sym->result->attr.function)))
5075 e->ts.type = BT_PROCEDURE;
5076 goto resolve_procedure;
5079 if (sym->ts.type != BT_UNKNOWN)
5080 gfc_variable_attr (e, &e->ts);
5083 /* Must be a simple variable reference. */
5084 if (gfc_set_default_type (sym, 1, sym->ns) == FAILURE)
5089 if (check_assumed_size_reference (sym, e))
5092 /* Deal with forward references to entries during resolve_code, to
5093 satisfy, at least partially, 12.5.2.5. */
5094 if (gfc_current_ns->entries
5095 && current_entry_id == sym->entry_id
5098 && cs_base->current->op != EXEC_ENTRY)
5100 gfc_entry_list *entry;
5101 gfc_formal_arglist *formal;
5105 /* If the symbol is a dummy... */
5106 if (sym->attr.dummy && sym->ns == gfc_current_ns)
5108 entry = gfc_current_ns->entries;
5111 /* ...test if the symbol is a parameter of previous entries. */
5112 for (; entry && entry->id <= current_entry_id; entry = entry->next)
5113 for (formal = entry->sym->formal; formal; formal = formal->next)
5115 if (formal->sym && sym->name == formal->sym->name)
5119 /* If it has not been seen as a dummy, this is an error. */
5122 if (specification_expr)
5123 gfc_error ("Variable '%s', used in a specification expression"
5124 ", is referenced at %L before the ENTRY statement "
5125 "in which it is a parameter",
5126 sym->name, &cs_base->current->loc);
5128 gfc_error ("Variable '%s' is used at %L before the ENTRY "
5129 "statement in which it is a parameter",
5130 sym->name, &cs_base->current->loc);
5135 /* Now do the same check on the specification expressions. */
5136 specification_expr = 1;
5137 if (sym->ts.type == BT_CHARACTER
5138 && gfc_resolve_expr (sym->ts.u.cl->length) == FAILURE)
5142 for (n = 0; n < sym->as->rank; n++)
5144 specification_expr = 1;
5145 if (gfc_resolve_expr (sym->as->lower[n]) == FAILURE)
5147 specification_expr = 1;
5148 if (gfc_resolve_expr (sym->as->upper[n]) == FAILURE)
5151 specification_expr = 0;
5154 /* Update the symbol's entry level. */
5155 sym->entry_id = current_entry_id + 1;
5158 /* If a symbol has been host_associated mark it. This is used latter,
5159 to identify if aliasing is possible via host association. */
5160 if (sym->attr.flavor == FL_VARIABLE
5161 && gfc_current_ns->parent
5162 && (gfc_current_ns->parent == sym->ns
5163 || (gfc_current_ns->parent->parent
5164 && gfc_current_ns->parent->parent == sym->ns)))
5165 sym->attr.host_assoc = 1;
5168 if (t == SUCCESS && resolve_procedure_expression (e) == FAILURE)
5171 /* F2008, C617 and C1229. */
5172 if (!inquiry_argument && (e->ts.type == BT_CLASS || e->ts.type == BT_DERIVED)
5173 && gfc_is_coindexed (e))
5175 gfc_ref *ref, *ref2 = NULL;
5177 for (ref = e->ref; ref; ref = ref->next)
5179 if (ref->type == REF_COMPONENT)
5181 if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
5185 for ( ; ref; ref = ref->next)
5186 if (ref->type == REF_COMPONENT)
5189 /* Expression itself is not coindexed object. */
5190 if (ref && e->ts.type == BT_CLASS)
5192 gfc_error ("Polymorphic subobject of coindexed object at %L",
5197 /* Expression itself is coindexed object. */
5201 c = ref2 ? ref2->u.c.component : e->symtree->n.sym->components;
5202 for ( ; c; c = c->next)
5203 if (c->attr.allocatable && c->ts.type == BT_CLASS)
5205 gfc_error ("Coindexed object with polymorphic allocatable "
5206 "subcomponent at %L", &e->where);
5217 /* Checks to see that the correct symbol has been host associated.
5218 The only situation where this arises is that in which a twice
5219 contained function is parsed after the host association is made.
5220 Therefore, on detecting this, change the symbol in the expression
5221 and convert the array reference into an actual arglist if the old
5222 symbol is a variable. */
5224 check_host_association (gfc_expr *e)
5226 gfc_symbol *sym, *old_sym;
5230 gfc_actual_arglist *arg, *tail = NULL;
5231 bool retval = e->expr_type == EXPR_FUNCTION;
5233 /* If the expression is the result of substitution in
5234 interface.c(gfc_extend_expr) because there is no way in
5235 which the host association can be wrong. */
5236 if (e->symtree == NULL
5237 || e->symtree->n.sym == NULL
5238 || e->user_operator)
5241 old_sym = e->symtree->n.sym;
5243 if (gfc_current_ns->parent
5244 && old_sym->ns != gfc_current_ns)
5246 /* Use the 'USE' name so that renamed module symbols are
5247 correctly handled. */
5248 gfc_find_symbol (e->symtree->name, gfc_current_ns, 1, &sym);
5250 if (sym && old_sym != sym
5251 && sym->ts.type == old_sym->ts.type
5252 && sym->attr.flavor == FL_PROCEDURE
5253 && sym->attr.contained)
5255 /* Clear the shape, since it might not be valid. */
5256 gfc_free_shape (&e->shape, e->rank);
5258 /* Give the expression the right symtree! */
5259 gfc_find_sym_tree (e->symtree->name, NULL, 1, &st);
5260 gcc_assert (st != NULL);
5262 if (old_sym->attr.flavor == FL_PROCEDURE
5263 || e->expr_type == EXPR_FUNCTION)
5265 /* Original was function so point to the new symbol, since
5266 the actual argument list is already attached to the
5268 e->value.function.esym = NULL;
5273 /* Original was variable so convert array references into
5274 an actual arglist. This does not need any checking now
5275 since resolve_function will take care of it. */
5276 e->value.function.actual = NULL;
5277 e->expr_type = EXPR_FUNCTION;
5280 /* Ambiguity will not arise if the array reference is not
5281 the last reference. */
5282 for (ref = e->ref; ref; ref = ref->next)
5283 if (ref->type == REF_ARRAY && ref->next == NULL)
5286 gcc_assert (ref->type == REF_ARRAY);
5288 /* Grab the start expressions from the array ref and
5289 copy them into actual arguments. */
5290 for (n = 0; n < ref->u.ar.dimen; n++)
5292 arg = gfc_get_actual_arglist ();
5293 arg->expr = gfc_copy_expr (ref->u.ar.start[n]);
5294 if (e->value.function.actual == NULL)
5295 tail = e->value.function.actual = arg;
5303 /* Dump the reference list and set the rank. */
5304 gfc_free_ref_list (e->ref);
5306 e->rank = sym->as ? sym->as->rank : 0;
5309 gfc_resolve_expr (e);
5313 /* This might have changed! */
5314 return e->expr_type == EXPR_FUNCTION;
5319 gfc_resolve_character_operator (gfc_expr *e)
5321 gfc_expr *op1 = e->value.op.op1;
5322 gfc_expr *op2 = e->value.op.op2;
5323 gfc_expr *e1 = NULL;
5324 gfc_expr *e2 = NULL;
5326 gcc_assert (e->value.op.op == INTRINSIC_CONCAT);
5328 if (op1->ts.u.cl && op1->ts.u.cl->length)
5329 e1 = gfc_copy_expr (op1->ts.u.cl->length);
5330 else if (op1->expr_type == EXPR_CONSTANT)
5331 e1 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5332 op1->value.character.length);
5334 if (op2->ts.u.cl && op2->ts.u.cl->length)
5335 e2 = gfc_copy_expr (op2->ts.u.cl->length);
5336 else if (op2->expr_type == EXPR_CONSTANT)
5337 e2 = gfc_get_int_expr (gfc_default_integer_kind, NULL,
5338 op2->value.character.length);
5340 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5345 e->ts.u.cl->length = gfc_add (e1, e2);
5346 e->ts.u.cl->length->ts.type = BT_INTEGER;
5347 e->ts.u.cl->length->ts.kind = gfc_charlen_int_kind;
5348 gfc_simplify_expr (e->ts.u.cl->length, 0);
5349 gfc_resolve_expr (e->ts.u.cl->length);
5355 /* Ensure that an character expression has a charlen and, if possible, a
5356 length expression. */
5359 fixup_charlen (gfc_expr *e)
5361 /* The cases fall through so that changes in expression type and the need
5362 for multiple fixes are picked up. In all circumstances, a charlen should
5363 be available for the middle end to hang a backend_decl on. */
5364 switch (e->expr_type)
5367 gfc_resolve_character_operator (e);
5370 if (e->expr_type == EXPR_ARRAY)
5371 gfc_resolve_character_array_constructor (e);
5373 case EXPR_SUBSTRING:
5374 if (!e->ts.u.cl && e->ref)
5375 gfc_resolve_substring_charlen (e);
5379 e->ts.u.cl = gfc_new_charlen (gfc_current_ns, NULL);
5386 /* Update an actual argument to include the passed-object for type-bound
5387 procedures at the right position. */
5389 static gfc_actual_arglist*
5390 update_arglist_pass (gfc_actual_arglist* lst, gfc_expr* po, unsigned argpos,
5393 gcc_assert (argpos > 0);
5397 gfc_actual_arglist* result;
5399 result = gfc_get_actual_arglist ();
5403 result->name = name;
5409 lst->next = update_arglist_pass (lst->next, po, argpos - 1, name);
5411 lst = update_arglist_pass (NULL, po, argpos - 1, name);
5416 /* Extract the passed-object from an EXPR_COMPCALL (a copy of it). */
5419 extract_compcall_passed_object (gfc_expr* e)
5423 gcc_assert (e->expr_type == EXPR_COMPCALL);
5425 if (e->value.compcall.base_object)
5426 po = gfc_copy_expr (e->value.compcall.base_object);
5429 po = gfc_get_expr ();
5430 po->expr_type = EXPR_VARIABLE;
5431 po->symtree = e->symtree;
5432 po->ref = gfc_copy_ref (e->ref);
5433 po->where = e->where;
5436 if (gfc_resolve_expr (po) == FAILURE)
5443 /* Update the arglist of an EXPR_COMPCALL expression to include the
5447 update_compcall_arglist (gfc_expr* e)
5450 gfc_typebound_proc* tbp;
5452 tbp = e->value.compcall.tbp;
5457 po = extract_compcall_passed_object (e);
5461 if (tbp->nopass || e->value.compcall.ignore_pass)
5467 gcc_assert (tbp->pass_arg_num > 0);
5468 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5476 /* Extract the passed object from a PPC call (a copy of it). */
5479 extract_ppc_passed_object (gfc_expr *e)
5484 po = gfc_get_expr ();
5485 po->expr_type = EXPR_VARIABLE;
5486 po->symtree = e->symtree;
5487 po->ref = gfc_copy_ref (e->ref);
5488 po->where = e->where;
5490 /* Remove PPC reference. */
5492 while ((*ref)->next)
5493 ref = &(*ref)->next;
5494 gfc_free_ref_list (*ref);
5497 if (gfc_resolve_expr (po) == FAILURE)
5504 /* Update the actual arglist of a procedure pointer component to include the
5508 update_ppc_arglist (gfc_expr* e)
5512 gfc_typebound_proc* tb;
5514 if (!gfc_is_proc_ptr_comp (e, &ppc))
5521 else if (tb->nopass)
5524 po = extract_ppc_passed_object (e);
5531 gfc_error ("Passed-object at %L must be scalar", &e->where);
5536 if (po->ts.type == BT_DERIVED && po->ts.u.derived->attr.abstract)
5538 gfc_error ("Base object for procedure-pointer component call at %L is of"
5539 " ABSTRACT type '%s'", &e->where, po->ts.u.derived->name);
5543 gcc_assert (tb->pass_arg_num > 0);
5544 e->value.compcall.actual = update_arglist_pass (e->value.compcall.actual, po,
5552 /* Check that the object a TBP is called on is valid, i.e. it must not be
5553 of ABSTRACT type (as in subobject%abstract_parent%tbp()). */
5556 check_typebound_baseobject (gfc_expr* e)
5559 gfc_try return_value = FAILURE;
5561 base = extract_compcall_passed_object (e);
5565 gcc_assert (base->ts.type == BT_DERIVED || base->ts.type == BT_CLASS);
5568 if (base->ts.type == BT_DERIVED && base->ts.u.derived->attr.abstract)
5570 gfc_error ("Base object for type-bound procedure call at %L is of"
5571 " ABSTRACT type '%s'", &e->where, base->ts.u.derived->name);
5575 /* F08:C1230. If the procedure called is NOPASS,
5576 the base object must be scalar. */
5577 if (e->value.compcall.tbp->nopass && base->rank > 0)
5579 gfc_error ("Base object for NOPASS type-bound procedure call at %L must"
5580 " be scalar", &e->where);
5584 /* FIXME: Remove once PR 43214 is fixed (TBP with non-scalar PASS). */
5587 gfc_error ("Non-scalar base object at %L currently not implemented",
5592 return_value = SUCCESS;
5595 gfc_free_expr (base);
5596 return return_value;
5600 /* Resolve a call to a type-bound procedure, either function or subroutine,
5601 statically from the data in an EXPR_COMPCALL expression. The adapted
5602 arglist and the target-procedure symtree are returned. */
5605 resolve_typebound_static (gfc_expr* e, gfc_symtree** target,
5606 gfc_actual_arglist** actual)
5608 gcc_assert (e->expr_type == EXPR_COMPCALL);
5609 gcc_assert (!e->value.compcall.tbp->is_generic);
5611 /* Update the actual arglist for PASS. */
5612 if (update_compcall_arglist (e) == FAILURE)
5615 *actual = e->value.compcall.actual;
5616 *target = e->value.compcall.tbp->u.specific;
5618 gfc_free_ref_list (e->ref);
5620 e->value.compcall.actual = NULL;
5626 /* Get the ultimate declared type from an expression. In addition,
5627 return the last class/derived type reference and the copy of the
5630 get_declared_from_expr (gfc_ref **class_ref, gfc_ref **new_ref,
5633 gfc_symbol *declared;
5640 *new_ref = gfc_copy_ref (e->ref);
5642 for (ref = e->ref; ref; ref = ref->next)
5644 if (ref->type != REF_COMPONENT)
5647 if (ref->u.c.component->ts.type == BT_CLASS
5648 || ref->u.c.component->ts.type == BT_DERIVED)
5650 declared = ref->u.c.component->ts.u.derived;
5656 if (declared == NULL)
5657 declared = e->symtree->n.sym->ts.u.derived;
5663 /* Given an EXPR_COMPCALL calling a GENERIC typebound procedure, figure out
5664 which of the specific bindings (if any) matches the arglist and transform
5665 the expression into a call of that binding. */
5668 resolve_typebound_generic_call (gfc_expr* e, const char **name)
5670 gfc_typebound_proc* genproc;
5671 const char* genname;
5673 gfc_symbol *derived;
5675 gcc_assert (e->expr_type == EXPR_COMPCALL);
5676 genname = e->value.compcall.name;
5677 genproc = e->value.compcall.tbp;
5679 if (!genproc->is_generic)
5682 /* Try the bindings on this type and in the inheritance hierarchy. */
5683 for (; genproc; genproc = genproc->overridden)
5687 gcc_assert (genproc->is_generic);
5688 for (g = genproc->u.generic; g; g = g->next)
5691 gfc_actual_arglist* args;
5694 gcc_assert (g->specific);
5696 if (g->specific->error)
5699 target = g->specific->u.specific->n.sym;
5701 /* Get the right arglist by handling PASS/NOPASS. */
5702 args = gfc_copy_actual_arglist (e->value.compcall.actual);
5703 if (!g->specific->nopass)
5706 po = extract_compcall_passed_object (e);
5710 gcc_assert (g->specific->pass_arg_num > 0);
5711 gcc_assert (!g->specific->error);
5712 args = update_arglist_pass (args, po, g->specific->pass_arg_num,
5713 g->specific->pass_arg);
5715 resolve_actual_arglist (args, target->attr.proc,
5716 is_external_proc (target) && !target->formal);
5718 /* Check if this arglist matches the formal. */
5719 matches = gfc_arglist_matches_symbol (&args, target);
5721 /* Clean up and break out of the loop if we've found it. */
5722 gfc_free_actual_arglist (args);
5725 e->value.compcall.tbp = g->specific;
5726 genname = g->specific_st->name;
5727 /* Pass along the name for CLASS methods, where the vtab
5728 procedure pointer component has to be referenced. */
5736 /* Nothing matching found! */
5737 gfc_error ("Found no matching specific binding for the call to the GENERIC"
5738 " '%s' at %L", genname, &e->where);
5742 /* Make sure that we have the right specific instance for the name. */
5743 derived = get_declared_from_expr (NULL, NULL, e);
5745 st = gfc_find_typebound_proc (derived, NULL, genname, true, &e->where);
5747 e->value.compcall.tbp = st->n.tb;
5753 /* Resolve a call to a type-bound subroutine. */
5756 resolve_typebound_call (gfc_code* c, const char **name)
5758 gfc_actual_arglist* newactual;
5759 gfc_symtree* target;
5761 /* Check that's really a SUBROUTINE. */
5762 if (!c->expr1->value.compcall.tbp->subroutine)
5764 gfc_error ("'%s' at %L should be a SUBROUTINE",
5765 c->expr1->value.compcall.name, &c->loc);
5769 if (check_typebound_baseobject (c->expr1) == FAILURE)
5772 /* Pass along the name for CLASS methods, where the vtab
5773 procedure pointer component has to be referenced. */
5775 *name = c->expr1->value.compcall.name;
5777 if (resolve_typebound_generic_call (c->expr1, name) == FAILURE)
5780 /* Transform into an ordinary EXEC_CALL for now. */
5782 if (resolve_typebound_static (c->expr1, &target, &newactual) == FAILURE)
5785 c->ext.actual = newactual;
5786 c->symtree = target;
5787 c->op = (c->expr1->value.compcall.assign ? EXEC_ASSIGN_CALL : EXEC_CALL);
5789 gcc_assert (!c->expr1->ref && !c->expr1->value.compcall.actual);
5791 gfc_free_expr (c->expr1);
5792 c->expr1 = gfc_get_expr ();
5793 c->expr1->expr_type = EXPR_FUNCTION;
5794 c->expr1->symtree = target;
5795 c->expr1->where = c->loc;
5797 return resolve_call (c);
5801 /* Resolve a component-call expression. */
5803 resolve_compcall (gfc_expr* e, const char **name)
5805 gfc_actual_arglist* newactual;
5806 gfc_symtree* target;
5808 /* Check that's really a FUNCTION. */
5809 if (!e->value.compcall.tbp->function)
5811 gfc_error ("'%s' at %L should be a FUNCTION",
5812 e->value.compcall.name, &e->where);
5816 /* These must not be assign-calls! */
5817 gcc_assert (!e->value.compcall.assign);
5819 if (check_typebound_baseobject (e) == FAILURE)
5822 /* Pass along the name for CLASS methods, where the vtab
5823 procedure pointer component has to be referenced. */
5825 *name = e->value.compcall.name;
5827 if (resolve_typebound_generic_call (e, name) == FAILURE)
5829 gcc_assert (!e->value.compcall.tbp->is_generic);
5831 /* Take the rank from the function's symbol. */
5832 if (e->value.compcall.tbp->u.specific->n.sym->as)
5833 e->rank = e->value.compcall.tbp->u.specific->n.sym->as->rank;
5835 /* For now, we simply transform it into an EXPR_FUNCTION call with the same
5836 arglist to the TBP's binding target. */
5838 if (resolve_typebound_static (e, &target, &newactual) == FAILURE)
5841 e->value.function.actual = newactual;
5842 e->value.function.name = NULL;
5843 e->value.function.esym = target->n.sym;
5844 e->value.function.isym = NULL;
5845 e->symtree = target;
5846 e->ts = target->n.sym->ts;
5847 e->expr_type = EXPR_FUNCTION;
5849 /* Resolution is not necessary if this is a class subroutine; this
5850 function only has to identify the specific proc. Resolution of
5851 the call will be done next in resolve_typebound_call. */
5852 return gfc_resolve_expr (e);
5857 /* Resolve a typebound function, or 'method'. First separate all
5858 the non-CLASS references by calling resolve_compcall directly. */
5861 resolve_typebound_function (gfc_expr* e)
5863 gfc_symbol *declared;
5875 /* Deal with typebound operators for CLASS objects. */
5876 expr = e->value.compcall.base_object;
5877 overridable = !e->value.compcall.tbp->non_overridable;
5878 if (expr && expr->ts.type == BT_CLASS && e->value.compcall.name)
5880 /* Since the typebound operators are generic, we have to ensure
5881 that any delays in resolution are corrected and that the vtab
5884 declared = ts.u.derived;
5885 c = gfc_find_component (declared, "_vptr", true, true);
5886 if (c->ts.u.derived == NULL)
5887 c->ts.u.derived = gfc_find_derived_vtab (declared);
5889 if (resolve_compcall (e, &name) == FAILURE)
5892 /* Use the generic name if it is there. */
5893 name = name ? name : e->value.function.esym->name;
5894 e->symtree = expr->symtree;
5895 e->ref = gfc_copy_ref (expr->ref);
5896 gfc_add_vptr_component (e);
5897 gfc_add_component_ref (e, name);
5898 e->value.function.esym = NULL;
5903 return resolve_compcall (e, NULL);
5905 if (resolve_ref (e) == FAILURE)
5908 /* Get the CLASS declared type. */
5909 declared = get_declared_from_expr (&class_ref, &new_ref, e);
5911 /* Weed out cases of the ultimate component being a derived type. */
5912 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
5913 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
5915 gfc_free_ref_list (new_ref);
5916 return resolve_compcall (e, NULL);
5919 c = gfc_find_component (declared, "_data", true, true);
5920 declared = c->ts.u.derived;
5922 /* Treat the call as if it is a typebound procedure, in order to roll
5923 out the correct name for the specific function. */
5924 if (resolve_compcall (e, &name) == FAILURE)
5930 /* Convert the expression to a procedure pointer component call. */
5931 e->value.function.esym = NULL;
5937 /* '_vptr' points to the vtab, which contains the procedure pointers. */
5938 gfc_add_vptr_component (e);
5939 gfc_add_component_ref (e, name);
5941 /* Recover the typespec for the expression. This is really only
5942 necessary for generic procedures, where the additional call
5943 to gfc_add_component_ref seems to throw the collection of the
5944 correct typespec. */
5951 /* Resolve a typebound subroutine, or 'method'. First separate all
5952 the non-CLASS references by calling resolve_typebound_call
5956 resolve_typebound_subroutine (gfc_code *code)
5958 gfc_symbol *declared;
5968 st = code->expr1->symtree;
5970 /* Deal with typebound operators for CLASS objects. */
5971 expr = code->expr1->value.compcall.base_object;
5972 overridable = !code->expr1->value.compcall.tbp->non_overridable;
5973 if (expr && expr->ts.type == BT_CLASS && code->expr1->value.compcall.name)
5975 /* Since the typebound operators are generic, we have to ensure
5976 that any delays in resolution are corrected and that the vtab
5978 declared = expr->ts.u.derived;
5979 c = gfc_find_component (declared, "_vptr", true, true);
5980 if (c->ts.u.derived == NULL)
5981 c->ts.u.derived = gfc_find_derived_vtab (declared);
5983 if (resolve_typebound_call (code, &name) == FAILURE)
5986 /* Use the generic name if it is there. */
5987 name = name ? name : code->expr1->value.function.esym->name;
5988 code->expr1->symtree = expr->symtree;
5989 code->expr1->ref = gfc_copy_ref (expr->ref);
5990 gfc_add_vptr_component (code->expr1);
5991 gfc_add_component_ref (code->expr1, name);
5992 code->expr1->value.function.esym = NULL;
5997 return resolve_typebound_call (code, NULL);
5999 if (resolve_ref (code->expr1) == FAILURE)
6002 /* Get the CLASS declared type. */
6003 get_declared_from_expr (&class_ref, &new_ref, code->expr1);
6005 /* Weed out cases of the ultimate component being a derived type. */
6006 if ((class_ref && class_ref->u.c.component->ts.type == BT_DERIVED)
6007 || (!class_ref && st->n.sym->ts.type != BT_CLASS))
6009 gfc_free_ref_list (new_ref);
6010 return resolve_typebound_call (code, NULL);
6013 if (resolve_typebound_call (code, &name) == FAILURE)
6015 ts = code->expr1->ts;
6019 /* Convert the expression to a procedure pointer component call. */
6020 code->expr1->value.function.esym = NULL;
6021 code->expr1->symtree = st;
6024 code->expr1->ref = new_ref;
6026 /* '_vptr' points to the vtab, which contains the procedure pointers. */
6027 gfc_add_vptr_component (code->expr1);
6028 gfc_add_component_ref (code->expr1, name);
6030 /* Recover the typespec for the expression. This is really only
6031 necessary for generic procedures, where the additional call
6032 to gfc_add_component_ref seems to throw the collection of the
6033 correct typespec. */
6034 code->expr1->ts = ts;
6041 /* Resolve a CALL to a Procedure Pointer Component (Subroutine). */
6044 resolve_ppc_call (gfc_code* c)
6046 gfc_component *comp;
6049 b = gfc_is_proc_ptr_comp (c->expr1, &comp);
6052 c->resolved_sym = c->expr1->symtree->n.sym;
6053 c->expr1->expr_type = EXPR_VARIABLE;
6055 if (!comp->attr.subroutine)
6056 gfc_add_subroutine (&comp->attr, comp->name, &c->expr1->where);
6058 if (resolve_ref (c->expr1) == FAILURE)
6061 if (update_ppc_arglist (c->expr1) == FAILURE)
6064 c->ext.actual = c->expr1->value.compcall.actual;
6066 if (resolve_actual_arglist (c->ext.actual, comp->attr.proc,
6067 comp->formal == NULL) == FAILURE)
6070 gfc_ppc_use (comp, &c->expr1->value.compcall.actual, &c->expr1->where);
6076 /* Resolve a Function Call to a Procedure Pointer Component (Function). */
6079 resolve_expr_ppc (gfc_expr* e)
6081 gfc_component *comp;
6084 b = gfc_is_proc_ptr_comp (e, &comp);
6087 /* Convert to EXPR_FUNCTION. */
6088 e->expr_type = EXPR_FUNCTION;
6089 e->value.function.isym = NULL;
6090 e->value.function.actual = e->value.compcall.actual;
6092 if (comp->as != NULL)
6093 e->rank = comp->as->rank;
6095 if (!comp->attr.function)
6096 gfc_add_function (&comp->attr, comp->name, &e->where);
6098 if (resolve_ref (e) == FAILURE)
6101 if (resolve_actual_arglist (e->value.function.actual, comp->attr.proc,
6102 comp->formal == NULL) == FAILURE)
6105 if (update_ppc_arglist (e) == FAILURE)
6108 gfc_ppc_use (comp, &e->value.compcall.actual, &e->where);
6115 gfc_is_expandable_expr (gfc_expr *e)
6117 gfc_constructor *con;
6119 if (e->expr_type == EXPR_ARRAY)
6121 /* Traverse the constructor looking for variables that are flavor
6122 parameter. Parameters must be expanded since they are fully used at
6124 con = gfc_constructor_first (e->value.constructor);
6125 for (; con; con = gfc_constructor_next (con))
6127 if (con->expr->expr_type == EXPR_VARIABLE
6128 && con->expr->symtree
6129 && (con->expr->symtree->n.sym->attr.flavor == FL_PARAMETER
6130 || con->expr->symtree->n.sym->attr.flavor == FL_VARIABLE))
6132 if (con->expr->expr_type == EXPR_ARRAY
6133 && gfc_is_expandable_expr (con->expr))
6141 /* Resolve an expression. That is, make sure that types of operands agree
6142 with their operators, intrinsic operators are converted to function calls
6143 for overloaded types and unresolved function references are resolved. */
6146 gfc_resolve_expr (gfc_expr *e)
6154 /* inquiry_argument only applies to variables. */
6155 inquiry_save = inquiry_argument;
6156 if (e->expr_type != EXPR_VARIABLE)
6157 inquiry_argument = false;
6159 switch (e->expr_type)
6162 t = resolve_operator (e);
6168 if (check_host_association (e))
6169 t = resolve_function (e);
6172 t = resolve_variable (e);
6174 expression_rank (e);
6177 if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
6178 && e->ref->type != REF_SUBSTRING)
6179 gfc_resolve_substring_charlen (e);
6184 t = resolve_typebound_function (e);
6187 case EXPR_SUBSTRING:
6188 t = resolve_ref (e);
6197 t = resolve_expr_ppc (e);
6202 if (resolve_ref (e) == FAILURE)
6205 t = gfc_resolve_array_constructor (e);
6206 /* Also try to expand a constructor. */
6209 expression_rank (e);
6210 if (gfc_is_constant_expr (e) || gfc_is_expandable_expr (e))
6211 gfc_expand_constructor (e, false);
6214 /* This provides the opportunity for the length of constructors with
6215 character valued function elements to propagate the string length
6216 to the expression. */
6217 if (t == SUCCESS && e->ts.type == BT_CHARACTER)
6219 /* For efficiency, we call gfc_expand_constructor for BT_CHARACTER
6220 here rather then add a duplicate test for it above. */
6221 gfc_expand_constructor (e, false);
6222 t = gfc_resolve_character_array_constructor (e);
6227 case EXPR_STRUCTURE:
6228 t = resolve_ref (e);
6232 t = resolve_structure_cons (e, 0);
6236 t = gfc_simplify_expr (e, 0);
6240 gfc_internal_error ("gfc_resolve_expr(): Bad expression type");
6243 if (e->ts.type == BT_CHARACTER && t == SUCCESS && !e->ts.u.cl)
6246 inquiry_argument = inquiry_save;
6252 /* Resolve an expression from an iterator. They must be scalar and have
6253 INTEGER or (optionally) REAL type. */
6256 gfc_resolve_iterator_expr (gfc_expr *expr, bool real_ok,
6257 const char *name_msgid)
6259 if (gfc_resolve_expr (expr) == FAILURE)
6262 if (expr->rank != 0)
6264 gfc_error ("%s at %L must be a scalar", _(name_msgid), &expr->where);
6268 if (expr->ts.type != BT_INTEGER)
6270 if (expr->ts.type == BT_REAL)
6273 return gfc_notify_std (GFC_STD_F95_DEL,
6274 "Deleted feature: %s at %L must be integer",
6275 _(name_msgid), &expr->where);
6278 gfc_error ("%s at %L must be INTEGER", _(name_msgid),
6285 gfc_error ("%s at %L must be INTEGER", _(name_msgid), &expr->where);
6293 /* Resolve the expressions in an iterator structure. If REAL_OK is
6294 false allow only INTEGER type iterators, otherwise allow REAL types. */
6297 gfc_resolve_iterator (gfc_iterator *iter, bool real_ok)
6299 if (gfc_resolve_iterator_expr (iter->var, real_ok, "Loop variable")
6303 if (gfc_check_vardef_context (iter->var, false, false, _("iterator variable"))
6307 if (gfc_resolve_iterator_expr (iter->start, real_ok,
6308 "Start expression in DO loop") == FAILURE)
6311 if (gfc_resolve_iterator_expr (iter->end, real_ok,
6312 "End expression in DO loop") == FAILURE)
6315 if (gfc_resolve_iterator_expr (iter->step, real_ok,
6316 "Step expression in DO loop") == FAILURE)
6319 if (iter->step->expr_type == EXPR_CONSTANT)
6321 if ((iter->step->ts.type == BT_INTEGER
6322 && mpz_cmp_ui (iter->step->value.integer, 0) == 0)
6323 || (iter->step->ts.type == BT_REAL
6324 && mpfr_sgn (iter->step->value.real) == 0))
6326 gfc_error ("Step expression in DO loop at %L cannot be zero",
6327 &iter->step->where);
6332 /* Convert start, end, and step to the same type as var. */
6333 if (iter->start->ts.kind != iter->var->ts.kind
6334 || iter->start->ts.type != iter->var->ts.type)
6335 gfc_convert_type (iter->start, &iter->var->ts, 2);
6337 if (iter->end->ts.kind != iter->var->ts.kind
6338 || iter->end->ts.type != iter->var->ts.type)
6339 gfc_convert_type (iter->end, &iter->var->ts, 2);
6341 if (iter->step->ts.kind != iter->var->ts.kind
6342 || iter->step->ts.type != iter->var->ts.type)
6343 gfc_convert_type (iter->step, &iter->var->ts, 2);
6345 if (iter->start->expr_type == EXPR_CONSTANT
6346 && iter->end->expr_type == EXPR_CONSTANT
6347 && iter->step->expr_type == EXPR_CONSTANT)
6350 if (iter->start->ts.type == BT_INTEGER)
6352 sgn = mpz_cmp_ui (iter->step->value.integer, 0);
6353 cmp = mpz_cmp (iter->end->value.integer, iter->start->value.integer);
6357 sgn = mpfr_sgn (iter->step->value.real);
6358 cmp = mpfr_cmp (iter->end->value.real, iter->start->value.real);
6360 if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
6361 gfc_warning ("DO loop at %L will be executed zero times",
6362 &iter->step->where);
6369 /* Traversal function for find_forall_index. f == 2 signals that
6370 that variable itself is not to be checked - only the references. */
6373 forall_index (gfc_expr *expr, gfc_symbol *sym, int *f)
6375 if (expr->expr_type != EXPR_VARIABLE)
6378 /* A scalar assignment */
6379 if (!expr->ref || *f == 1)
6381 if (expr->symtree->n.sym == sym)
6393 /* Check whether the FORALL index appears in the expression or not.
6394 Returns SUCCESS if SYM is found in EXPR. */
6397 find_forall_index (gfc_expr *expr, gfc_symbol *sym, int f)
6399 if (gfc_traverse_expr (expr, sym, forall_index, f))
6406 /* Resolve a list of FORALL iterators. The FORALL index-name is constrained
6407 to be a scalar INTEGER variable. The subscripts and stride are scalar
6408 INTEGERs, and if stride is a constant it must be nonzero.
6409 Furthermore "A subscript or stride in a forall-triplet-spec shall
6410 not contain a reference to any index-name in the
6411 forall-triplet-spec-list in which it appears." (7.5.4.1) */
6414 resolve_forall_iterators (gfc_forall_iterator *it)
6416 gfc_forall_iterator *iter, *iter2;
6418 for (iter = it; iter; iter = iter->next)
6420 if (gfc_resolve_expr (iter->var) == SUCCESS
6421 && (iter->var->ts.type != BT_INTEGER || iter->var->rank != 0))
6422 gfc_error ("FORALL index-name at %L must be a scalar INTEGER",
6425 if (gfc_resolve_expr (iter->start) == SUCCESS
6426 && (iter->start->ts.type != BT_INTEGER || iter->start->rank != 0))
6427 gfc_error ("FORALL start expression at %L must be a scalar INTEGER",
6428 &iter->start->where);
6429 if (iter->var->ts.kind != iter->start->ts.kind)
6430 gfc_convert_type (iter->start, &iter->var->ts, 2);
6432 if (gfc_resolve_expr (iter->end) == SUCCESS
6433 && (iter->end->ts.type != BT_INTEGER || iter->end->rank != 0))
6434 gfc_error ("FORALL end expression at %L must be a scalar INTEGER",
6436 if (iter->var->ts.kind != iter->end->ts.kind)
6437 gfc_convert_type (iter->end, &iter->var->ts, 2);
6439 if (gfc_resolve_expr (iter->stride) == SUCCESS)
6441 if (iter->stride->ts.type != BT_INTEGER || iter->stride->rank != 0)
6442 gfc_error ("FORALL stride expression at %L must be a scalar %s",
6443 &iter->stride->where, "INTEGER");
6445 if (iter->stride->expr_type == EXPR_CONSTANT
6446 && mpz_cmp_ui(iter->stride->value.integer, 0) == 0)
6447 gfc_error ("FORALL stride expression at %L cannot be zero",
6448 &iter->stride->where);
6450 if (iter->var->ts.kind != iter->stride->ts.kind)
6451 gfc_convert_type (iter->stride, &iter->var->ts, 2);
6454 for (iter = it; iter; iter = iter->next)
6455 for (iter2 = iter; iter2; iter2 = iter2->next)
6457 if (find_forall_index (iter2->start,
6458 iter->var->symtree->n.sym, 0) == SUCCESS
6459 || find_forall_index (iter2->end,
6460 iter->var->symtree->n.sym, 0) == SUCCESS
6461 || find_forall_index (iter2->stride,
6462 iter->var->symtree->n.sym, 0) == SUCCESS)
6463 gfc_error ("FORALL index '%s' may not appear in triplet "
6464 "specification at %L", iter->var->symtree->name,
6465 &iter2->start->where);
6470 /* Given a pointer to a symbol that is a derived type, see if it's
6471 inaccessible, i.e. if it's defined in another module and the components are
6472 PRIVATE. The search is recursive if necessary. Returns zero if no
6473 inaccessible components are found, nonzero otherwise. */
6476 derived_inaccessible (gfc_symbol *sym)
6480 if (sym->attr.use_assoc && sym->attr.private_comp)
6483 for (c = sym->components; c; c = c->next)
6485 if (c->ts.type == BT_DERIVED && derived_inaccessible (c->ts.u.derived))
6493 /* Resolve the argument of a deallocate expression. The expression must be
6494 a pointer or a full array. */
6497 resolve_deallocate_expr (gfc_expr *e)
6499 symbol_attribute attr;
6500 int allocatable, pointer;
6505 if (gfc_resolve_expr (e) == FAILURE)
6508 if (e->expr_type != EXPR_VARIABLE)
6511 sym = e->symtree->n.sym;
6513 if (sym->ts.type == BT_CLASS)
6515 allocatable = CLASS_DATA (sym)->attr.allocatable;
6516 pointer = CLASS_DATA (sym)->attr.class_pointer;
6520 allocatable = sym->attr.allocatable;
6521 pointer = sym->attr.pointer;
6523 for (ref = e->ref; ref; ref = ref->next)
6528 if (ref->u.ar.type != AR_FULL
6529 && !(ref->u.ar.type == AR_ELEMENT && ref->u.ar.as->rank == 0
6530 && ref->u.ar.codimen && gfc_ref_this_image (ref)))
6535 c = ref->u.c.component;
6536 if (c->ts.type == BT_CLASS)
6538 allocatable = CLASS_DATA (c)->attr.allocatable;
6539 pointer = CLASS_DATA (c)->attr.class_pointer;
6543 allocatable = c->attr.allocatable;
6544 pointer = c->attr.pointer;
6554 attr = gfc_expr_attr (e);
6556 if (allocatable == 0 && attr.pointer == 0)
6559 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6565 if (gfc_is_coindexed (e))
6567 gfc_error ("Coindexed allocatable object at %L", &e->where);
6572 && gfc_check_vardef_context (e, true, true, _("DEALLOCATE object"))
6575 if (gfc_check_vardef_context (e, false, true, _("DEALLOCATE object"))
6583 /* Returns true if the expression e contains a reference to the symbol sym. */
6585 sym_in_expr (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
6587 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym == sym)
6594 gfc_find_sym_in_expr (gfc_symbol *sym, gfc_expr *e)
6596 return gfc_traverse_expr (e, sym, sym_in_expr, 0);
6600 /* Given the expression node e for an allocatable/pointer of derived type to be
6601 allocated, get the expression node to be initialized afterwards (needed for
6602 derived types with default initializers, and derived types with allocatable
6603 components that need nullification.) */
6606 gfc_expr_to_initialize (gfc_expr *e)
6612 result = gfc_copy_expr (e);
6614 /* Change the last array reference from AR_ELEMENT to AR_FULL. */
6615 for (ref = result->ref; ref; ref = ref->next)
6616 if (ref->type == REF_ARRAY && ref->next == NULL)
6618 ref->u.ar.type = AR_FULL;
6620 for (i = 0; i < ref->u.ar.dimen; i++)
6621 ref->u.ar.start[i] = ref->u.ar.end[i] = ref->u.ar.stride[i] = NULL;
6626 gfc_free_shape (&result->shape, result->rank);
6628 /* Recalculate rank, shape, etc. */
6629 gfc_resolve_expr (result);
6634 /* If the last ref of an expression is an array ref, return a copy of the
6635 expression with that one removed. Otherwise, a copy of the original
6636 expression. This is used for allocate-expressions and pointer assignment
6637 LHS, where there may be an array specification that needs to be stripped
6638 off when using gfc_check_vardef_context. */
6641 remove_last_array_ref (gfc_expr* e)
6646 e2 = gfc_copy_expr (e);
6647 for (r = &e2->ref; *r; r = &(*r)->next)
6648 if ((*r)->type == REF_ARRAY && !(*r)->next)
6650 gfc_free_ref_list (*r);
6659 /* Used in resolve_allocate_expr to check that a allocation-object and
6660 a source-expr are conformable. This does not catch all possible
6661 cases; in particular a runtime checking is needed. */
6664 conformable_arrays (gfc_expr *e1, gfc_expr *e2)
6667 for (tail = e2->ref; tail && tail->next; tail = tail->next);
6669 /* First compare rank. */
6670 if (tail && e1->rank != tail->u.ar.as->rank)
6672 gfc_error ("Source-expr at %L must be scalar or have the "
6673 "same rank as the allocate-object at %L",
6674 &e1->where, &e2->where);
6685 for (i = 0; i < e1->rank; i++)
6687 if (tail->u.ar.end[i])
6689 mpz_set (s, tail->u.ar.end[i]->value.integer);
6690 mpz_sub (s, s, tail->u.ar.start[i]->value.integer);
6691 mpz_add_ui (s, s, 1);
6695 mpz_set (s, tail->u.ar.start[i]->value.integer);
6698 if (mpz_cmp (e1->shape[i], s) != 0)
6700 gfc_error ("Source-expr at %L and allocate-object at %L must "
6701 "have the same shape", &e1->where, &e2->where);
6714 /* Resolve the expression in an ALLOCATE statement, doing the additional
6715 checks to see whether the expression is OK or not. The expression must
6716 have a trailing array reference that gives the size of the array. */
6719 resolve_allocate_expr (gfc_expr *e, gfc_code *code)
6721 int i, pointer, allocatable, dimension, is_abstract;
6724 symbol_attribute attr;
6725 gfc_ref *ref, *ref2;
6728 gfc_symbol *sym = NULL;
6733 /* Mark the ultimost array component as being in allocate to allow DIMEN_STAR
6734 checking of coarrays. */
6735 for (ref = e->ref; ref; ref = ref->next)
6736 if (ref->next == NULL)
6739 if (ref && ref->type == REF_ARRAY)
6740 ref->u.ar.in_allocate = true;
6742 if (gfc_resolve_expr (e) == FAILURE)
6745 /* Make sure the expression is allocatable or a pointer. If it is
6746 pointer, the next-to-last reference must be a pointer. */
6750 sym = e->symtree->n.sym;
6752 /* Check whether ultimate component is abstract and CLASS. */
6755 if (e->expr_type != EXPR_VARIABLE)
6758 attr = gfc_expr_attr (e);
6759 pointer = attr.pointer;
6760 dimension = attr.dimension;
6761 codimension = attr.codimension;
6765 if (sym->ts.type == BT_CLASS)
6767 allocatable = CLASS_DATA (sym)->attr.allocatable;
6768 pointer = CLASS_DATA (sym)->attr.class_pointer;
6769 dimension = CLASS_DATA (sym)->attr.dimension;
6770 codimension = CLASS_DATA (sym)->attr.codimension;
6771 is_abstract = CLASS_DATA (sym)->attr.abstract;
6775 allocatable = sym->attr.allocatable;
6776 pointer = sym->attr.pointer;
6777 dimension = sym->attr.dimension;
6778 codimension = sym->attr.codimension;
6783 for (ref = e->ref; ref; ref2 = ref, ref = ref->next)
6788 if (ref->u.ar.codimen > 0)
6791 for (n = ref->u.ar.dimen;
6792 n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
6793 if (ref->u.ar.dimen_type[n] != DIMEN_THIS_IMAGE)
6800 if (ref->next != NULL)
6808 gfc_error ("Coindexed allocatable object at %L",
6813 c = ref->u.c.component;
6814 if (c->ts.type == BT_CLASS)
6816 allocatable = CLASS_DATA (c)->attr.allocatable;
6817 pointer = CLASS_DATA (c)->attr.class_pointer;
6818 dimension = CLASS_DATA (c)->attr.dimension;
6819 codimension = CLASS_DATA (c)->attr.codimension;
6820 is_abstract = CLASS_DATA (c)->attr.abstract;
6824 allocatable = c->attr.allocatable;
6825 pointer = c->attr.pointer;
6826 dimension = c->attr.dimension;
6827 codimension = c->attr.codimension;
6828 is_abstract = c->attr.abstract;
6840 if (allocatable == 0 && pointer == 0)
6842 gfc_error ("Allocate-object at %L must be ALLOCATABLE or a POINTER",
6847 /* Some checks for the SOURCE tag. */
6850 /* Check F03:C631. */
6851 if (!gfc_type_compatible (&e->ts, &code->expr3->ts))
6853 gfc_error ("Type of entity at %L is type incompatible with "
6854 "source-expr at %L", &e->where, &code->expr3->where);
6858 /* Check F03:C632 and restriction following Note 6.18. */
6859 if (code->expr3->rank > 0
6860 && conformable_arrays (code->expr3, e) == FAILURE)
6863 /* Check F03:C633. */
6864 if (code->expr3->ts.kind != e->ts.kind)
6866 gfc_error ("The allocate-object at %L and the source-expr at %L "
6867 "shall have the same kind type parameter",
6868 &e->where, &code->expr3->where);
6872 /* Check F2008, C642. */
6873 if (code->expr3->ts.type == BT_DERIVED
6874 && ((codimension && gfc_expr_attr (code->expr3).lock_comp)
6875 || (code->expr3->ts.u.derived->from_intmod
6876 == INTMOD_ISO_FORTRAN_ENV
6877 && code->expr3->ts.u.derived->intmod_sym_id
6878 == ISOFORTRAN_LOCK_TYPE)))
6880 gfc_error ("The source-expr at %L shall neither be of type "
6881 "LOCK_TYPE nor have a LOCK_TYPE component if "
6882 "allocate-object at %L is a coarray",
6883 &code->expr3->where, &e->where);
6888 /* Check F08:C629. */
6889 if (is_abstract && code->ext.alloc.ts.type == BT_UNKNOWN
6892 gcc_assert (e->ts.type == BT_CLASS);
6893 gfc_error ("Allocating %s of ABSTRACT base type at %L requires a "
6894 "type-spec or source-expr", sym->name, &e->where);
6898 /* In the variable definition context checks, gfc_expr_attr is used
6899 on the expression. This is fooled by the array specification
6900 present in e, thus we have to eliminate that one temporarily. */
6901 e2 = remove_last_array_ref (e);
6903 if (t == SUCCESS && pointer)
6904 t = gfc_check_vardef_context (e2, true, true, _("ALLOCATE object"));
6906 t = gfc_check_vardef_context (e2, false, true, _("ALLOCATE object"));
6913 /* Set up default initializer if needed. */
6917 if (code->ext.alloc.ts.type == BT_DERIVED)
6918 ts = code->ext.alloc.ts;
6922 if (ts.type == BT_CLASS)
6923 ts = ts.u.derived->components->ts;
6925 if (ts.type == BT_DERIVED && (init_e = gfc_default_initializer (&ts)))
6927 gfc_code *init_st = gfc_get_code ();
6928 init_st->loc = code->loc;
6929 init_st->op = EXEC_INIT_ASSIGN;
6930 init_st->expr1 = gfc_expr_to_initialize (e);
6931 init_st->expr2 = init_e;
6932 init_st->next = code->next;
6933 code->next = init_st;
6936 else if (code->expr3->mold && code->expr3->ts.type == BT_DERIVED)
6938 /* Default initialization via MOLD (non-polymorphic). */
6939 gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
6940 gfc_resolve_expr (rhs);
6941 gfc_free_expr (code->expr3);
6945 if (e->ts.type == BT_CLASS)
6947 /* Make sure the vtab symbol is present when
6948 the module variables are generated. */
6949 gfc_typespec ts = e->ts;
6951 ts = code->expr3->ts;
6952 else if (code->ext.alloc.ts.type == BT_DERIVED)
6953 ts = code->ext.alloc.ts;
6954 gfc_find_derived_vtab (ts.u.derived);
6957 if (dimension == 0 && codimension == 0)
6960 /* Make sure the last reference node is an array specifiction. */
6962 if (!ref2 || ref2->type != REF_ARRAY || ref2->u.ar.type == AR_FULL
6963 || (dimension && ref2->u.ar.dimen == 0))
6965 gfc_error ("Array specification required in ALLOCATE statement "
6966 "at %L", &e->where);
6970 /* Make sure that the array section reference makes sense in the
6971 context of an ALLOCATE specification. */
6976 for (i = ar->dimen; i < ar->dimen + ar->codimen; i++)
6977 if (ar->dimen_type[i] == DIMEN_THIS_IMAGE)
6979 gfc_error ("Coarray specification required in ALLOCATE statement "
6980 "at %L", &e->where);
6984 for (i = 0; i < ar->dimen; i++)
6986 if (ref2->u.ar.type == AR_ELEMENT)
6989 switch (ar->dimen_type[i])
6995 if (ar->start[i] != NULL
6996 && ar->end[i] != NULL
6997 && ar->stride[i] == NULL)
7000 /* Fall Through... */
7005 case DIMEN_THIS_IMAGE:
7006 gfc_error ("Bad array specification in ALLOCATE statement at %L",
7012 for (a = code->ext.alloc.list; a; a = a->next)
7014 sym = a->expr->symtree->n.sym;
7016 /* TODO - check derived type components. */
7017 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
7020 if ((ar->start[i] != NULL
7021 && gfc_find_sym_in_expr (sym, ar->start[i]))
7022 || (ar->end[i] != NULL
7023 && gfc_find_sym_in_expr (sym, ar->end[i])))
7025 gfc_error ("'%s' must not appear in the array specification at "
7026 "%L in the same ALLOCATE statement where it is "
7027 "itself allocated", sym->name, &ar->where);
7033 for (i = ar->dimen; i < ar->codimen + ar->dimen; i++)
7035 if (ar->dimen_type[i] == DIMEN_ELEMENT
7036 || ar->dimen_type[i] == DIMEN_RANGE)
7038 if (i == (ar->dimen + ar->codimen - 1))
7040 gfc_error ("Expected '*' in coindex specification in ALLOCATE "
7041 "statement at %L", &e->where);
7047 if (ar->dimen_type[i] == DIMEN_STAR && i == (ar->dimen + ar->codimen - 1)
7048 && ar->stride[i] == NULL)
7051 gfc_error ("Bad coarray specification in ALLOCATE statement at %L",
7064 resolve_allocate_deallocate (gfc_code *code, const char *fcn)
7066 gfc_expr *stat, *errmsg, *pe, *qe;
7067 gfc_alloc *a, *p, *q;
7070 errmsg = code->expr2;
7072 /* Check the stat variable. */
7075 gfc_check_vardef_context (stat, false, false, _("STAT variable"));
7077 if ((stat->ts.type != BT_INTEGER
7078 && !(stat->ref && (stat->ref->type == REF_ARRAY
7079 || stat->ref->type == REF_COMPONENT)))
7081 gfc_error ("Stat-variable at %L must be a scalar INTEGER "
7082 "variable", &stat->where);
7084 for (p = code->ext.alloc.list; p; p = p->next)
7085 if (p->expr->symtree->n.sym->name == stat->symtree->n.sym->name)
7087 gfc_ref *ref1, *ref2;
7090 for (ref1 = p->expr->ref, ref2 = stat->ref; ref1 && ref2;
7091 ref1 = ref1->next, ref2 = ref2->next)
7093 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7095 if (ref1->u.c.component->name != ref2->u.c.component->name)
7104 gfc_error ("Stat-variable at %L shall not be %sd within "
7105 "the same %s statement", &stat->where, fcn, fcn);
7111 /* Check the errmsg variable. */
7115 gfc_warning ("ERRMSG at %L is useless without a STAT tag",
7118 gfc_check_vardef_context (errmsg, false, false, _("ERRMSG variable"));
7120 if ((errmsg->ts.type != BT_CHARACTER
7122 && (errmsg->ref->type == REF_ARRAY
7123 || errmsg->ref->type == REF_COMPONENT)))
7124 || errmsg->rank > 0 )
7125 gfc_error ("Errmsg-variable at %L must be a scalar CHARACTER "
7126 "variable", &errmsg->where);
7128 for (p = code->ext.alloc.list; p; p = p->next)
7129 if (p->expr->symtree->n.sym->name == errmsg->symtree->n.sym->name)
7131 gfc_ref *ref1, *ref2;
7134 for (ref1 = p->expr->ref, ref2 = errmsg->ref; ref1 && ref2;
7135 ref1 = ref1->next, ref2 = ref2->next)
7137 if (ref1->type != REF_COMPONENT || ref2->type != REF_COMPONENT)
7139 if (ref1->u.c.component->name != ref2->u.c.component->name)
7148 gfc_error ("Errmsg-variable at %L shall not be %sd within "
7149 "the same %s statement", &errmsg->where, fcn, fcn);
7155 /* Check that an allocate-object appears only once in the statement.
7156 FIXME: Checking derived types is disabled. */
7157 for (p = code->ext.alloc.list; p; p = p->next)
7160 for (q = p->next; q; q = q->next)
7163 if (pe->symtree->n.sym->name == qe->symtree->n.sym->name)
7165 /* This is a potential collision. */
7166 gfc_ref *pr = pe->ref;
7167 gfc_ref *qr = qe->ref;
7169 /* Follow the references until
7170 a) They start to differ, in which case there is no error;
7171 you can deallocate a%b and a%c in a single statement
7172 b) Both of them stop, which is an error
7173 c) One of them stops, which is also an error. */
7176 if (pr == NULL && qr == NULL)
7178 gfc_error ("Allocate-object at %L also appears at %L",
7179 &pe->where, &qe->where);
7182 else if (pr != NULL && qr == NULL)
7184 gfc_error ("Allocate-object at %L is subobject of"
7185 " object at %L", &pe->where, &qe->where);
7188 else if (pr == NULL && qr != NULL)
7190 gfc_error ("Allocate-object at %L is subobject of"
7191 " object at %L", &qe->where, &pe->where);
7194 /* Here, pr != NULL && qr != NULL */
7195 gcc_assert(pr->type == qr->type);
7196 if (pr->type == REF_ARRAY)
7198 /* Handle cases like allocate(v(3)%x(3), v(2)%x(3)),
7200 gcc_assert (qr->type == REF_ARRAY);
7202 if (pr->next && qr->next)
7204 gfc_array_ref *par = &(pr->u.ar);
7205 gfc_array_ref *qar = &(qr->u.ar);
7206 if (gfc_dep_compare_expr (par->start[0],
7207 qar->start[0]) != 0)
7213 if (pr->u.c.component->name != qr->u.c.component->name)
7224 if (strcmp (fcn, "ALLOCATE") == 0)
7226 for (a = code->ext.alloc.list; a; a = a->next)
7227 resolve_allocate_expr (a->expr, code);
7231 for (a = code->ext.alloc.list; a; a = a->next)
7232 resolve_deallocate_expr (a->expr);
7237 /************ SELECT CASE resolution subroutines ************/
7239 /* Callback function for our mergesort variant. Determines interval
7240 overlaps for CASEs. Return <0 if op1 < op2, 0 for overlap, >0 for
7241 op1 > op2. Assumes we're not dealing with the default case.
7242 We have op1 = (:L), (K:L) or (K:) and op2 = (:N), (M:N) or (M:).
7243 There are nine situations to check. */
7246 compare_cases (const gfc_case *op1, const gfc_case *op2)
7250 if (op1->low == NULL) /* op1 = (:L) */
7252 /* op2 = (:N), so overlap. */
7254 /* op2 = (M:) or (M:N), L < M */
7255 if (op2->low != NULL
7256 && gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7259 else if (op1->high == NULL) /* op1 = (K:) */
7261 /* op2 = (M:), so overlap. */
7263 /* op2 = (:N) or (M:N), K > N */
7264 if (op2->high != NULL
7265 && gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7268 else /* op1 = (K:L) */
7270 if (op2->low == NULL) /* op2 = (:N), K > N */
7271 retval = (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7273 else if (op2->high == NULL) /* op2 = (M:), L < M */
7274 retval = (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7276 else /* op2 = (M:N) */
7280 if (gfc_compare_expr (op1->high, op2->low, INTRINSIC_LT) < 0)
7283 else if (gfc_compare_expr (op1->low, op2->high, INTRINSIC_GT) > 0)
7292 /* Merge-sort a double linked case list, detecting overlap in the
7293 process. LIST is the head of the double linked case list before it
7294 is sorted. Returns the head of the sorted list if we don't see any
7295 overlap, or NULL otherwise. */
7298 check_case_overlap (gfc_case *list)
7300 gfc_case *p, *q, *e, *tail;
7301 int insize, nmerges, psize, qsize, cmp, overlap_seen;
7303 /* If the passed list was empty, return immediately. */
7310 /* Loop unconditionally. The only exit from this loop is a return
7311 statement, when we've finished sorting the case list. */
7318 /* Count the number of merges we do in this pass. */
7321 /* Loop while there exists a merge to be done. */
7326 /* Count this merge. */
7329 /* Cut the list in two pieces by stepping INSIZE places
7330 forward in the list, starting from P. */
7333 for (i = 0; i < insize; i++)
7342 /* Now we have two lists. Merge them! */
7343 while (psize > 0 || (qsize > 0 && q != NULL))
7345 /* See from which the next case to merge comes from. */
7348 /* P is empty so the next case must come from Q. */
7353 else if (qsize == 0 || q == NULL)
7362 cmp = compare_cases (p, q);
7365 /* The whole case range for P is less than the
7373 /* The whole case range for Q is greater than
7374 the case range for P. */
7381 /* The cases overlap, or they are the same
7382 element in the list. Either way, we must
7383 issue an error and get the next case from P. */
7384 /* FIXME: Sort P and Q by line number. */
7385 gfc_error ("CASE label at %L overlaps with CASE "
7386 "label at %L", &p->where, &q->where);
7394 /* Add the next element to the merged list. */
7403 /* P has now stepped INSIZE places along, and so has Q. So
7404 they're the same. */
7409 /* If we have done only one merge or none at all, we've
7410 finished sorting the cases. */
7419 /* Otherwise repeat, merging lists twice the size. */
7425 /* Check to see if an expression is suitable for use in a CASE statement.
7426 Makes sure that all case expressions are scalar constants of the same
7427 type. Return FAILURE if anything is wrong. */
7430 validate_case_label_expr (gfc_expr *e, gfc_expr *case_expr)
7432 if (e == NULL) return SUCCESS;
7434 if (e->ts.type != case_expr->ts.type)
7436 gfc_error ("Expression in CASE statement at %L must be of type %s",
7437 &e->where, gfc_basic_typename (case_expr->ts.type));
7441 /* C805 (R808) For a given case-construct, each case-value shall be of
7442 the same type as case-expr. For character type, length differences
7443 are allowed, but the kind type parameters shall be the same. */
7445 if (case_expr->ts.type == BT_CHARACTER && e->ts.kind != case_expr->ts.kind)
7447 gfc_error ("Expression in CASE statement at %L must be of kind %d",
7448 &e->where, case_expr->ts.kind);
7452 /* Convert the case value kind to that of case expression kind,
7455 if (e->ts.kind != case_expr->ts.kind)
7456 gfc_convert_type_warn (e, &case_expr->ts, 2, 0);
7460 gfc_error ("Expression in CASE statement at %L must be scalar",
7469 /* Given a completely parsed select statement, we:
7471 - Validate all expressions and code within the SELECT.
7472 - Make sure that the selection expression is not of the wrong type.
7473 - Make sure that no case ranges overlap.
7474 - Eliminate unreachable cases and unreachable code resulting from
7475 removing case labels.
7477 The standard does allow unreachable cases, e.g. CASE (5:3). But
7478 they are a hassle for code generation, and to prevent that, we just
7479 cut them out here. This is not necessary for overlapping cases
7480 because they are illegal and we never even try to generate code.
7482 We have the additional caveat that a SELECT construct could have
7483 been a computed GOTO in the source code. Fortunately we can fairly
7484 easily work around that here: The case_expr for a "real" SELECT CASE
7485 is in code->expr1, but for a computed GOTO it is in code->expr2. All
7486 we have to do is make sure that the case_expr is a scalar integer
7490 resolve_select (gfc_code *code)
7493 gfc_expr *case_expr;
7494 gfc_case *cp, *default_case, *tail, *head;
7495 int seen_unreachable;
7501 if (code->expr1 == NULL)
7503 /* This was actually a computed GOTO statement. */
7504 case_expr = code->expr2;
7505 if (case_expr->ts.type != BT_INTEGER|| case_expr->rank != 0)
7506 gfc_error ("Selection expression in computed GOTO statement "
7507 "at %L must be a scalar integer expression",
7510 /* Further checking is not necessary because this SELECT was built
7511 by the compiler, so it should always be OK. Just move the
7512 case_expr from expr2 to expr so that we can handle computed
7513 GOTOs as normal SELECTs from here on. */
7514 code->expr1 = code->expr2;
7519 case_expr = code->expr1;
7521 type = case_expr->ts.type;
7522 if (type != BT_LOGICAL && type != BT_INTEGER && type != BT_CHARACTER)
7524 gfc_error ("Argument of SELECT statement at %L cannot be %s",
7525 &case_expr->where, gfc_typename (&case_expr->ts));
7527 /* Punt. Going on here just produce more garbage error messages. */
7531 if (case_expr->rank != 0)
7533 gfc_error ("Argument of SELECT statement at %L must be a scalar "
7534 "expression", &case_expr->where);
7541 /* Raise a warning if an INTEGER case value exceeds the range of
7542 the case-expr. Later, all expressions will be promoted to the
7543 largest kind of all case-labels. */
7545 if (type == BT_INTEGER)
7546 for (body = code->block; body; body = body->block)
7547 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7550 && gfc_check_integer_range (cp->low->value.integer,
7551 case_expr->ts.kind) != ARITH_OK)
7552 gfc_warning ("Expression in CASE statement at %L is "
7553 "not in the range of %s", &cp->low->where,
7554 gfc_typename (&case_expr->ts));
7557 && cp->low != cp->high
7558 && gfc_check_integer_range (cp->high->value.integer,
7559 case_expr->ts.kind) != ARITH_OK)
7560 gfc_warning ("Expression in CASE statement at %L is "
7561 "not in the range of %s", &cp->high->where,
7562 gfc_typename (&case_expr->ts));
7565 /* PR 19168 has a long discussion concerning a mismatch of the kinds
7566 of the SELECT CASE expression and its CASE values. Walk the lists
7567 of case values, and if we find a mismatch, promote case_expr to
7568 the appropriate kind. */
7570 if (type == BT_LOGICAL || type == BT_INTEGER)
7572 for (body = code->block; body; body = body->block)
7574 /* Walk the case label list. */
7575 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7577 /* Intercept the DEFAULT case. It does not have a kind. */
7578 if (cp->low == NULL && cp->high == NULL)
7581 /* Unreachable case ranges are discarded, so ignore. */
7582 if (cp->low != NULL && cp->high != NULL
7583 && cp->low != cp->high
7584 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7588 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
7589 gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
7591 if (cp->high != NULL
7592 && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
7593 gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
7598 /* Assume there is no DEFAULT case. */
7599 default_case = NULL;
7604 for (body = code->block; body; body = body->block)
7606 /* Assume the CASE list is OK, and all CASE labels can be matched. */
7608 seen_unreachable = 0;
7610 /* Walk the case label list, making sure that all case labels
7612 for (cp = body->ext.block.case_list; cp; cp = cp->next)
7614 /* Count the number of cases in the whole construct. */
7617 /* Intercept the DEFAULT case. */
7618 if (cp->low == NULL && cp->high == NULL)
7620 if (default_case != NULL)
7622 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7623 "by a second DEFAULT CASE at %L",
7624 &default_case->where, &cp->where);
7635 /* Deal with single value cases and case ranges. Errors are
7636 issued from the validation function. */
7637 if (validate_case_label_expr (cp->low, case_expr) != SUCCESS
7638 || validate_case_label_expr (cp->high, case_expr) != SUCCESS)
7644 if (type == BT_LOGICAL
7645 && ((cp->low == NULL || cp->high == NULL)
7646 || cp->low != cp->high))
7648 gfc_error ("Logical range in CASE statement at %L is not "
7649 "allowed", &cp->low->where);
7654 if (type == BT_LOGICAL && cp->low->expr_type == EXPR_CONSTANT)
7657 value = cp->low->value.logical == 0 ? 2 : 1;
7658 if (value & seen_logical)
7660 gfc_error ("Constant logical value in CASE statement "
7661 "is repeated at %L",
7666 seen_logical |= value;
7669 if (cp->low != NULL && cp->high != NULL
7670 && cp->low != cp->high
7671 && gfc_compare_expr (cp->low, cp->high, INTRINSIC_GT) > 0)
7673 if (gfc_option.warn_surprising)
7674 gfc_warning ("Range specification at %L can never "
7675 "be matched", &cp->where);
7677 cp->unreachable = 1;
7678 seen_unreachable = 1;
7682 /* If the case range can be matched, it can also overlap with
7683 other cases. To make sure it does not, we put it in a
7684 double linked list here. We sort that with a merge sort
7685 later on to detect any overlapping cases. */
7689 head->right = head->left = NULL;
7694 tail->right->left = tail;
7701 /* It there was a failure in the previous case label, give up
7702 for this case label list. Continue with the next block. */
7706 /* See if any case labels that are unreachable have been seen.
7707 If so, we eliminate them. This is a bit of a kludge because
7708 the case lists for a single case statement (label) is a
7709 single forward linked lists. */
7710 if (seen_unreachable)
7712 /* Advance until the first case in the list is reachable. */
7713 while (body->ext.block.case_list != NULL
7714 && body->ext.block.case_list->unreachable)
7716 gfc_case *n = body->ext.block.case_list;
7717 body->ext.block.case_list = body->ext.block.case_list->next;
7719 gfc_free_case_list (n);
7722 /* Strip all other unreachable cases. */
7723 if (body->ext.block.case_list)
7725 for (cp = body->ext.block.case_list; cp->next; cp = cp->next)
7727 if (cp->next->unreachable)
7729 gfc_case *n = cp->next;
7730 cp->next = cp->next->next;
7732 gfc_free_case_list (n);
7739 /* See if there were overlapping cases. If the check returns NULL,
7740 there was overlap. In that case we don't do anything. If head
7741 is non-NULL, we prepend the DEFAULT case. The sorted list can
7742 then used during code generation for SELECT CASE constructs with
7743 a case expression of a CHARACTER type. */
7746 head = check_case_overlap (head);
7748 /* Prepend the default_case if it is there. */
7749 if (head != NULL && default_case)
7751 default_case->left = NULL;
7752 default_case->right = head;
7753 head->left = default_case;
7757 /* Eliminate dead blocks that may be the result if we've seen
7758 unreachable case labels for a block. */
7759 for (body = code; body && body->block; body = body->block)
7761 if (body->block->ext.block.case_list == NULL)
7763 /* Cut the unreachable block from the code chain. */
7764 gfc_code *c = body->block;
7765 body->block = c->block;
7767 /* Kill the dead block, but not the blocks below it. */
7769 gfc_free_statements (c);
7773 /* More than two cases is legal but insane for logical selects.
7774 Issue a warning for it. */
7775 if (gfc_option.warn_surprising && type == BT_LOGICAL
7777 gfc_warning ("Logical SELECT CASE block at %L has more that two cases",
7782 /* Check if a derived type is extensible. */
7785 gfc_type_is_extensible (gfc_symbol *sym)
7787 return !(sym->attr.is_bind_c || sym->attr.sequence);
7791 /* Resolve an associate name: Resolve target and ensure the type-spec is
7792 correct as well as possibly the array-spec. */
7795 resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
7799 gcc_assert (sym->assoc);
7800 gcc_assert (sym->attr.flavor == FL_VARIABLE);
7802 /* If this is for SELECT TYPE, the target may not yet be set. In that
7803 case, return. Resolution will be called later manually again when
7805 target = sym->assoc->target;
7808 gcc_assert (!sym->assoc->dangling);
7810 if (resolve_target && gfc_resolve_expr (target) != SUCCESS)
7813 /* For variable targets, we get some attributes from the target. */
7814 if (target->expr_type == EXPR_VARIABLE)
7818 gcc_assert (target->symtree);
7819 tsym = target->symtree->n.sym;
7821 sym->attr.asynchronous = tsym->attr.asynchronous;
7822 sym->attr.volatile_ = tsym->attr.volatile_;
7824 sym->attr.target = (tsym->attr.target || tsym->attr.pointer);
7827 /* Get type if this was not already set. Note that it can be
7828 some other type than the target in case this is a SELECT TYPE
7829 selector! So we must not update when the type is already there. */
7830 if (sym->ts.type == BT_UNKNOWN)
7831 sym->ts = target->ts;
7832 gcc_assert (sym->ts.type != BT_UNKNOWN);
7834 /* See if this is a valid association-to-variable. */
7835 sym->assoc->variable = (target->expr_type == EXPR_VARIABLE
7836 && !gfc_has_vector_subscript (target));
7838 /* Finally resolve if this is an array or not. */
7839 if (sym->attr.dimension && target->rank == 0)
7841 gfc_error ("Associate-name '%s' at %L is used as array",
7842 sym->name, &sym->declared_at);
7843 sym->attr.dimension = 0;
7846 if (target->rank > 0)
7847 sym->attr.dimension = 1;
7849 if (sym->attr.dimension)
7851 sym->as = gfc_get_array_spec ();
7852 sym->as->rank = target->rank;
7853 sym->as->type = AS_DEFERRED;
7855 /* Target must not be coindexed, thus the associate-variable
7857 sym->as->corank = 0;
7862 /* Resolve a SELECT TYPE statement. */
7865 resolve_select_type (gfc_code *code, gfc_namespace *old_ns)
7867 gfc_symbol *selector_type;
7868 gfc_code *body, *new_st, *if_st, *tail;
7869 gfc_code *class_is = NULL, *default_case = NULL;
7872 char name[GFC_MAX_SYMBOL_LEN];
7876 ns = code->ext.block.ns;
7879 /* Check for F03:C813. */
7880 if (code->expr1->ts.type != BT_CLASS
7881 && !(code->expr2 && code->expr2->ts.type == BT_CLASS))
7883 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
7884 "at %L", &code->loc);
7890 if (code->expr1->symtree->n.sym->attr.untyped)
7891 code->expr1->symtree->n.sym->ts = code->expr2->ts;
7892 selector_type = CLASS_DATA (code->expr2)->ts.u.derived;
7895 selector_type = CLASS_DATA (code->expr1)->ts.u.derived;
7897 /* Loop over TYPE IS / CLASS IS cases. */
7898 for (body = code->block; body; body = body->block)
7900 c = body->ext.block.case_list;
7902 /* Check F03:C815. */
7903 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7904 && !gfc_type_is_extensible (c->ts.u.derived))
7906 gfc_error ("Derived type '%s' at %L must be extensible",
7907 c->ts.u.derived->name, &c->where);
7912 /* Check F03:C816. */
7913 if ((c->ts.type == BT_DERIVED || c->ts.type == BT_CLASS)
7914 && !gfc_type_is_extension_of (selector_type, c->ts.u.derived))
7916 gfc_error ("Derived type '%s' at %L must be an extension of '%s'",
7917 c->ts.u.derived->name, &c->where, selector_type->name);
7922 /* Intercept the DEFAULT case. */
7923 if (c->ts.type == BT_UNKNOWN)
7925 /* Check F03:C818. */
7928 gfc_error ("The DEFAULT CASE at %L cannot be followed "
7929 "by a second DEFAULT CASE at %L",
7930 &default_case->ext.block.case_list->where, &c->where);
7935 default_case = body;
7942 /* Transform SELECT TYPE statement to BLOCK and associate selector to
7943 target if present. If there are any EXIT statements referring to the
7944 SELECT TYPE construct, this is no problem because the gfc_code
7945 reference stays the same and EXIT is equally possible from the BLOCK
7946 it is changed to. */
7947 code->op = EXEC_BLOCK;
7950 gfc_association_list* assoc;
7952 assoc = gfc_get_association_list ();
7953 assoc->st = code->expr1->symtree;
7954 assoc->target = gfc_copy_expr (code->expr2);
7955 /* assoc->variable will be set by resolve_assoc_var. */
7957 code->ext.block.assoc = assoc;
7958 code->expr1->symtree->n.sym->assoc = assoc;
7960 resolve_assoc_var (code->expr1->symtree->n.sym, false);
7963 code->ext.block.assoc = NULL;
7965 /* Add EXEC_SELECT to switch on type. */
7966 new_st = gfc_get_code ();
7967 new_st->op = code->op;
7968 new_st->expr1 = code->expr1;
7969 new_st->expr2 = code->expr2;
7970 new_st->block = code->block;
7971 code->expr1 = code->expr2 = NULL;
7976 ns->code->next = new_st;
7978 code->op = EXEC_SELECT;
7979 gfc_add_vptr_component (code->expr1);
7980 gfc_add_hash_component (code->expr1);
7982 /* Loop over TYPE IS / CLASS IS cases. */
7983 for (body = code->block; body; body = body->block)
7985 c = body->ext.block.case_list;
7987 if (c->ts.type == BT_DERIVED)
7988 c->low = c->high = gfc_get_int_expr (gfc_default_integer_kind, NULL,
7989 c->ts.u.derived->hash_value);
7991 else if (c->ts.type == BT_UNKNOWN)
7994 /* Associate temporary to selector. This should only be done
7995 when this case is actually true, so build a new ASSOCIATE
7996 that does precisely this here (instead of using the
7999 if (c->ts.type == BT_CLASS)
8000 sprintf (name, "__tmp_class_%s", c->ts.u.derived->name);
8002 sprintf (name, "__tmp_type_%s", c->ts.u.derived->name);
8003 st = gfc_find_symtree (ns->sym_root, name);
8004 gcc_assert (st->n.sym->assoc);
8005 st->n.sym->assoc->target = gfc_get_variable_expr (code->expr1->symtree);
8006 if (c->ts.type == BT_DERIVED)
8007 gfc_add_data_component (st->n.sym->assoc->target);
8009 new_st = gfc_get_code ();
8010 new_st->op = EXEC_BLOCK;
8011 new_st->ext.block.ns = gfc_build_block_ns (ns);
8012 new_st->ext.block.ns->code = body->next;
8013 body->next = new_st;
8015 /* Chain in the new list only if it is marked as dangling. Otherwise
8016 there is a CASE label overlap and this is already used. Just ignore,
8017 the error is diagonsed elsewhere. */
8018 if (st->n.sym->assoc->dangling)
8020 new_st->ext.block.assoc = st->n.sym->assoc;
8021 st->n.sym->assoc->dangling = 0;
8024 resolve_assoc_var (st->n.sym, false);
8027 /* Take out CLASS IS cases for separate treatment. */
8029 while (body && body->block)
8031 if (body->block->ext.block.case_list->ts.type == BT_CLASS)
8033 /* Add to class_is list. */
8034 if (class_is == NULL)
8036 class_is = body->block;
8041 for (tail = class_is; tail->block; tail = tail->block) ;
8042 tail->block = body->block;
8045 /* Remove from EXEC_SELECT list. */
8046 body->block = body->block->block;
8059 /* Add a default case to hold the CLASS IS cases. */
8060 for (tail = code; tail->block; tail = tail->block) ;
8061 tail->block = gfc_get_code ();
8063 tail->op = EXEC_SELECT_TYPE;
8064 tail->ext.block.case_list = gfc_get_case ();
8065 tail->ext.block.case_list->ts.type = BT_UNKNOWN;
8067 default_case = tail;
8070 /* More than one CLASS IS block? */
8071 if (class_is->block)
8075 /* Sort CLASS IS blocks by extension level. */
8079 for (c1 = &class_is; (*c1) && (*c1)->block; c1 = &((*c1)->block))
8082 /* F03:C817 (check for doubles). */
8083 if ((*c1)->ext.block.case_list->ts.u.derived->hash_value
8084 == c2->ext.block.case_list->ts.u.derived->hash_value)
8086 gfc_error ("Double CLASS IS block in SELECT TYPE "
8088 &c2->ext.block.case_list->where);
8091 if ((*c1)->ext.block.case_list->ts.u.derived->attr.extension
8092 < c2->ext.block.case_list->ts.u.derived->attr.extension)
8095 (*c1)->block = c2->block;
8105 /* Generate IF chain. */
8106 if_st = gfc_get_code ();
8107 if_st->op = EXEC_IF;
8109 for (body = class_is; body; body = body->block)
8111 new_st->block = gfc_get_code ();
8112 new_st = new_st->block;
8113 new_st->op = EXEC_IF;
8114 /* Set up IF condition: Call _gfortran_is_extension_of. */
8115 new_st->expr1 = gfc_get_expr ();
8116 new_st->expr1->expr_type = EXPR_FUNCTION;
8117 new_st->expr1->ts.type = BT_LOGICAL;
8118 new_st->expr1->ts.kind = 4;
8119 new_st->expr1->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
8120 new_st->expr1->value.function.isym = XCNEW (gfc_intrinsic_sym);
8121 new_st->expr1->value.function.isym->id = GFC_ISYM_EXTENDS_TYPE_OF;
8122 /* Set up arguments. */
8123 new_st->expr1->value.function.actual = gfc_get_actual_arglist ();
8124 new_st->expr1->value.function.actual->expr = gfc_get_variable_expr (code->expr1->symtree);
8125 new_st->expr1->value.function.actual->expr->where = code->loc;
8126 gfc_add_vptr_component (new_st->expr1->value.function.actual->expr);
8127 vtab = gfc_find_derived_vtab (body->ext.block.case_list->ts.u.derived);
8128 st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
8129 new_st->expr1->value.function.actual->next = gfc_get_actual_arglist ();
8130 new_st->expr1->value.function.actual->next->expr = gfc_get_variable_expr (st);
8131 new_st->next = body->next;
8133 if (default_case->next)
8135 new_st->block = gfc_get_code ();
8136 new_st = new_st->block;
8137 new_st->op = EXEC_IF;
8138 new_st->next = default_case->next;
8141 /* Replace CLASS DEFAULT code by the IF chain. */
8142 default_case->next = if_st;
8145 /* Resolve the internal code. This can not be done earlier because
8146 it requires that the sym->assoc of selectors is set already. */
8147 gfc_current_ns = ns;
8148 gfc_resolve_blocks (code->block, gfc_current_ns);
8149 gfc_current_ns = old_ns;
8151 resolve_select (code);
8155 /* Resolve a transfer statement. This is making sure that:
8156 -- a derived type being transferred has only non-pointer components
8157 -- a derived type being transferred doesn't have private components, unless
8158 it's being transferred from the module where the type was defined
8159 -- we're not trying to transfer a whole assumed size array. */
8162 resolve_transfer (gfc_code *code)
8171 while (exp != NULL && exp->expr_type == EXPR_OP
8172 && exp->value.op.op == INTRINSIC_PARENTHESES)
8173 exp = exp->value.op.op1;
8175 if (exp && exp->expr_type == EXPR_NULL && exp->ts.type == BT_UNKNOWN)
8177 gfc_error ("NULL intrinsic at %L in data transfer statement requires "
8178 "MOLD=", &exp->where);
8182 if (exp == NULL || (exp->expr_type != EXPR_VARIABLE
8183 && exp->expr_type != EXPR_FUNCTION))
8186 /* If we are reading, the variable will be changed. Note that
8187 code->ext.dt may be NULL if the TRANSFER is related to
8188 an INQUIRE statement -- but in this case, we are not reading, either. */
8189 if (code->ext.dt && code->ext.dt->dt_io_kind->value.iokind == M_READ
8190 && gfc_check_vardef_context (exp, false, false, _("item in READ"))
8194 sym = exp->symtree->n.sym;
8197 /* Go to actual component transferred. */
8198 for (ref = exp->ref; ref; ref = ref->next)
8199 if (ref->type == REF_COMPONENT)
8200 ts = &ref->u.c.component->ts;
8202 if (ts->type == BT_CLASS)
8204 /* FIXME: Test for defined input/output. */
8205 gfc_error ("Data transfer element at %L cannot be polymorphic unless "
8206 "it is processed by a defined input/output procedure",
8211 if (ts->type == BT_DERIVED)
8213 /* Check that transferred derived type doesn't contain POINTER
8215 if (ts->u.derived->attr.pointer_comp)
8217 gfc_error ("Data transfer element at %L cannot have POINTER "
8218 "components unless it is processed by a defined "
8219 "input/output procedure", &code->loc);
8224 if (ts->u.derived->attr.proc_pointer_comp)
8226 gfc_error ("Data transfer element at %L cannot have "
8227 "procedure pointer components", &code->loc);
8231 if (ts->u.derived->attr.alloc_comp)
8233 gfc_error ("Data transfer element at %L cannot have ALLOCATABLE "
8234 "components unless it is processed by a defined "
8235 "input/output procedure", &code->loc);
8239 if (derived_inaccessible (ts->u.derived))
8241 gfc_error ("Data transfer element at %L cannot have "
8242 "PRIVATE components",&code->loc);
8247 if (sym->as != NULL && sym->as->type == AS_ASSUMED_SIZE && exp->ref
8248 && exp->ref->type == REF_ARRAY && exp->ref->u.ar.type == AR_FULL)
8250 gfc_error ("Data transfer element at %L cannot be a full reference to "
8251 "an assumed-size array", &code->loc);
8257 /*********** Toplevel code resolution subroutines ***********/
8259 /* Find the set of labels that are reachable from this block. We also
8260 record the last statement in each block. */
8263 find_reachable_labels (gfc_code *block)
8270 cs_base->reachable_labels = bitmap_obstack_alloc (&labels_obstack);
8272 /* Collect labels in this block. We don't keep those corresponding
8273 to END {IF|SELECT}, these are checked in resolve_branch by going
8274 up through the code_stack. */
8275 for (c = block; c; c = c->next)
8277 if (c->here && c->op != EXEC_END_NESTED_BLOCK)
8278 bitmap_set_bit (cs_base->reachable_labels, c->here->value);
8281 /* Merge with labels from parent block. */
8284 gcc_assert (cs_base->prev->reachable_labels);
8285 bitmap_ior_into (cs_base->reachable_labels,
8286 cs_base->prev->reachable_labels);
8292 resolve_lock_unlock (gfc_code *code)
8294 if (code->expr1->ts.type != BT_DERIVED
8295 || code->expr1->expr_type != EXPR_VARIABLE
8296 || code->expr1->ts.u.derived->from_intmod != INTMOD_ISO_FORTRAN_ENV
8297 || code->expr1->ts.u.derived->intmod_sym_id != ISOFORTRAN_LOCK_TYPE
8298 || code->expr1->rank != 0
8299 || (!gfc_is_coarray (code->expr1) && !gfc_is_coindexed (code->expr1)))
8300 gfc_error ("Lock variable at %L must be a scalar of type LOCK_TYPE",
8301 &code->expr1->where);
8305 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8306 || code->expr2->expr_type != EXPR_VARIABLE))
8307 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8308 &code->expr2->where);
8311 && gfc_check_vardef_context (code->expr2, false, false,
8312 _("STAT variable")) == FAILURE)
8317 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8318 || code->expr3->expr_type != EXPR_VARIABLE))
8319 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8320 &code->expr3->where);
8323 && gfc_check_vardef_context (code->expr3, false, false,
8324 _("ERRMSG variable")) == FAILURE)
8327 /* Check ACQUIRED_LOCK. */
8329 && (code->expr4->ts.type != BT_LOGICAL || code->expr4->rank != 0
8330 || code->expr4->expr_type != EXPR_VARIABLE))
8331 gfc_error ("ACQUIRED_LOCK= argument at %L must be a scalar LOGICAL "
8332 "variable", &code->expr4->where);
8335 && gfc_check_vardef_context (code->expr4, false, false,
8336 _("ACQUIRED_LOCK variable")) == FAILURE)
8342 resolve_sync (gfc_code *code)
8344 /* Check imageset. The * case matches expr1 == NULL. */
8347 if (code->expr1->ts.type != BT_INTEGER || code->expr1->rank > 1)
8348 gfc_error ("Imageset argument at %L must be a scalar or rank-1 "
8349 "INTEGER expression", &code->expr1->where);
8350 if (code->expr1->expr_type == EXPR_CONSTANT && code->expr1->rank == 0
8351 && mpz_cmp_si (code->expr1->value.integer, 1) < 0)
8352 gfc_error ("Imageset argument at %L must between 1 and num_images()",
8353 &code->expr1->where);
8354 else if (code->expr1->expr_type == EXPR_ARRAY
8355 && gfc_simplify_expr (code->expr1, 0) == SUCCESS)
8357 gfc_constructor *cons;
8358 cons = gfc_constructor_first (code->expr1->value.constructor);
8359 for (; cons; cons = gfc_constructor_next (cons))
8360 if (cons->expr->expr_type == EXPR_CONSTANT
8361 && mpz_cmp_si (cons->expr->value.integer, 1) < 0)
8362 gfc_error ("Imageset argument at %L must between 1 and "
8363 "num_images()", &cons->expr->where);
8369 && (code->expr2->ts.type != BT_INTEGER || code->expr2->rank != 0
8370 || code->expr2->expr_type != EXPR_VARIABLE))
8371 gfc_error ("STAT= argument at %L must be a scalar INTEGER variable",
8372 &code->expr2->where);
8376 && (code->expr3->ts.type != BT_CHARACTER || code->expr3->rank != 0
8377 || code->expr3->expr_type != EXPR_VARIABLE))
8378 gfc_error ("ERRMSG= argument at %L must be a scalar CHARACTER variable",
8379 &code->expr3->where);
8383 /* Given a branch to a label, see if the branch is conforming.
8384 The code node describes where the branch is located. */
8387 resolve_branch (gfc_st_label *label, gfc_code *code)
8394 /* Step one: is this a valid branching target? */
8396 if (label->defined == ST_LABEL_UNKNOWN)
8398 gfc_error ("Label %d referenced at %L is never defined", label->value,
8403 if (label->defined != ST_LABEL_TARGET)
8405 gfc_error ("Statement at %L is not a valid branch target statement "
8406 "for the branch statement at %L", &label->where, &code->loc);
8410 /* Step two: make sure this branch is not a branch to itself ;-) */
8412 if (code->here == label)
8414 gfc_warning ("Branch at %L may result in an infinite loop", &code->loc);
8418 /* Step three: See if the label is in the same block as the
8419 branching statement. The hard work has been done by setting up
8420 the bitmap reachable_labels. */
8422 if (bitmap_bit_p (cs_base->reachable_labels, label->value))
8424 /* Check now whether there is a CRITICAL construct; if so, check
8425 whether the label is still visible outside of the CRITICAL block,
8426 which is invalid. */
8427 for (stack = cs_base; stack; stack = stack->prev)
8429 if (stack->current->op == EXEC_CRITICAL
8430 && bitmap_bit_p (stack->reachable_labels, label->value))
8431 gfc_error ("GOTO statement at %L leaves CRITICAL construct for "
8432 "label at %L", &code->loc, &label->where);
8433 else if (stack->current->op == EXEC_DO_CONCURRENT
8434 && bitmap_bit_p (stack->reachable_labels, label->value))
8435 gfc_error ("GOTO statement at %L leaves DO CONCURRENT construct "
8436 "for label at %L", &code->loc, &label->where);
8442 /* Step four: If we haven't found the label in the bitmap, it may
8443 still be the label of the END of the enclosing block, in which
8444 case we find it by going up the code_stack. */
8446 for (stack = cs_base; stack; stack = stack->prev)
8448 if (stack->current->next && stack->current->next->here == label)
8450 if (stack->current->op == EXEC_CRITICAL)
8452 /* Note: A label at END CRITICAL does not leave the CRITICAL
8453 construct as END CRITICAL is still part of it. */
8454 gfc_error ("GOTO statement at %L leaves CRITICAL construct for label"
8455 " at %L", &code->loc, &label->where);
8458 else if (stack->current->op == EXEC_DO_CONCURRENT)
8460 gfc_error ("GOTO statement at %L leaves DO CONCURRENT construct for "
8461 "label at %L", &code->loc, &label->where);
8468 gcc_assert (stack->current->next->op == EXEC_END_NESTED_BLOCK);
8472 /* The label is not in an enclosing block, so illegal. This was
8473 allowed in Fortran 66, so we allow it as extension. No
8474 further checks are necessary in this case. */
8475 gfc_notify_std (GFC_STD_LEGACY, "Label at %L is not in the same block "
8476 "as the GOTO statement at %L", &label->where,
8482 /* Check whether EXPR1 has the same shape as EXPR2. */
8485 resolve_where_shape (gfc_expr *expr1, gfc_expr *expr2)
8487 mpz_t shape[GFC_MAX_DIMENSIONS];
8488 mpz_t shape2[GFC_MAX_DIMENSIONS];
8489 gfc_try result = FAILURE;
8492 /* Compare the rank. */
8493 if (expr1->rank != expr2->rank)
8496 /* Compare the size of each dimension. */
8497 for (i=0; i<expr1->rank; i++)
8499 if (gfc_array_dimen_size (expr1, i, &shape[i]) == FAILURE)
8502 if (gfc_array_dimen_size (expr2, i, &shape2[i]) == FAILURE)
8505 if (mpz_cmp (shape[i], shape2[i]))
8509 /* When either of the two expression is an assumed size array, we
8510 ignore the comparison of dimension sizes. */
8515 gfc_clear_shape (shape, i);
8516 gfc_clear_shape (shape2, i);
8521 /* Check whether a WHERE assignment target or a WHERE mask expression
8522 has the same shape as the outmost WHERE mask expression. */
8525 resolve_where (gfc_code *code, gfc_expr *mask)
8531 cblock = code->block;
8533 /* Store the first WHERE mask-expr of the WHERE statement or construct.
8534 In case of nested WHERE, only the outmost one is stored. */
8535 if (mask == NULL) /* outmost WHERE */
8537 else /* inner WHERE */
8544 /* Check if the mask-expr has a consistent shape with the
8545 outmost WHERE mask-expr. */
8546 if (resolve_where_shape (cblock->expr1, e) == FAILURE)
8547 gfc_error ("WHERE mask at %L has inconsistent shape",
8548 &cblock->expr1->where);
8551 /* the assignment statement of a WHERE statement, or the first
8552 statement in where-body-construct of a WHERE construct */
8553 cnext = cblock->next;
8558 /* WHERE assignment statement */
8561 /* Check shape consistent for WHERE assignment target. */
8562 if (e && resolve_where_shape (cnext->expr1, e) == FAILURE)
8563 gfc_error ("WHERE assignment target at %L has "
8564 "inconsistent shape", &cnext->expr1->where);
8568 case EXEC_ASSIGN_CALL:
8569 resolve_call (cnext);
8570 if (!cnext->resolved_sym->attr.elemental)
8571 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8572 &cnext->ext.actual->expr->where);
8575 /* WHERE or WHERE construct is part of a where-body-construct */
8577 resolve_where (cnext, e);
8581 gfc_error ("Unsupported statement inside WHERE at %L",
8584 /* the next statement within the same where-body-construct */
8585 cnext = cnext->next;
8587 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8588 cblock = cblock->block;
8593 /* Resolve assignment in FORALL construct.
8594 NVAR is the number of FORALL index variables, and VAR_EXPR records the
8595 FORALL index variables. */
8598 gfc_resolve_assign_in_forall (gfc_code *code, int nvar, gfc_expr **var_expr)
8602 for (n = 0; n < nvar; n++)
8604 gfc_symbol *forall_index;
8606 forall_index = var_expr[n]->symtree->n.sym;
8608 /* Check whether the assignment target is one of the FORALL index
8610 if ((code->expr1->expr_type == EXPR_VARIABLE)
8611 && (code->expr1->symtree->n.sym == forall_index))
8612 gfc_error ("Assignment to a FORALL index variable at %L",
8613 &code->expr1->where);
8616 /* If one of the FORALL index variables doesn't appear in the
8617 assignment variable, then there could be a many-to-one
8618 assignment. Emit a warning rather than an error because the
8619 mask could be resolving this problem. */
8620 if (find_forall_index (code->expr1, forall_index, 0) == FAILURE)
8621 gfc_warning ("The FORALL with index '%s' is not used on the "
8622 "left side of the assignment at %L and so might "
8623 "cause multiple assignment to this object",
8624 var_expr[n]->symtree->name, &code->expr1->where);
8630 /* Resolve WHERE statement in FORALL construct. */
8633 gfc_resolve_where_code_in_forall (gfc_code *code, int nvar,
8634 gfc_expr **var_expr)
8639 cblock = code->block;
8642 /* the assignment statement of a WHERE statement, or the first
8643 statement in where-body-construct of a WHERE construct */
8644 cnext = cblock->next;
8649 /* WHERE assignment statement */
8651 gfc_resolve_assign_in_forall (cnext, nvar, var_expr);
8654 /* WHERE operator assignment statement */
8655 case EXEC_ASSIGN_CALL:
8656 resolve_call (cnext);
8657 if (!cnext->resolved_sym->attr.elemental)
8658 gfc_error("Non-ELEMENTAL user-defined assignment in WHERE at %L",
8659 &cnext->ext.actual->expr->where);
8662 /* WHERE or WHERE construct is part of a where-body-construct */
8664 gfc_resolve_where_code_in_forall (cnext, nvar, var_expr);
8668 gfc_error ("Unsupported statement inside WHERE at %L",
8671 /* the next statement within the same where-body-construct */
8672 cnext = cnext->next;
8674 /* the next masked-elsewhere-stmt, elsewhere-stmt, or end-where-stmt */
8675 cblock = cblock->block;
8680 /* Traverse the FORALL body to check whether the following errors exist:
8681 1. For assignment, check if a many-to-one assignment happens.
8682 2. For WHERE statement, check the WHERE body to see if there is any
8683 many-to-one assignment. */
8686 gfc_resolve_forall_body (gfc_code *code, int nvar, gfc_expr **var_expr)
8690 c = code->block->next;
8696 case EXEC_POINTER_ASSIGN:
8697 gfc_resolve_assign_in_forall (c, nvar, var_expr);
8700 case EXEC_ASSIGN_CALL:
8704 /* Because the gfc_resolve_blocks() will handle the nested FORALL,
8705 there is no need to handle it here. */
8709 gfc_resolve_where_code_in_forall(c, nvar, var_expr);
8714 /* The next statement in the FORALL body. */
8720 /* Counts the number of iterators needed inside a forall construct, including
8721 nested forall constructs. This is used to allocate the needed memory
8722 in gfc_resolve_forall. */
8725 gfc_count_forall_iterators (gfc_code *code)
8727 int max_iters, sub_iters, current_iters;
8728 gfc_forall_iterator *fa;
8730 gcc_assert(code->op == EXEC_FORALL);
8734 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8737 code = code->block->next;
8741 if (code->op == EXEC_FORALL)
8743 sub_iters = gfc_count_forall_iterators (code);
8744 if (sub_iters > max_iters)
8745 max_iters = sub_iters;
8750 return current_iters + max_iters;
8754 /* Given a FORALL construct, first resolve the FORALL iterator, then call
8755 gfc_resolve_forall_body to resolve the FORALL body. */
8758 gfc_resolve_forall (gfc_code *code, gfc_namespace *ns, int forall_save)
8760 static gfc_expr **var_expr;
8761 static int total_var = 0;
8762 static int nvar = 0;
8764 gfc_forall_iterator *fa;
8769 /* Start to resolve a FORALL construct */
8770 if (forall_save == 0)
8772 /* Count the total number of FORALL index in the nested FORALL
8773 construct in order to allocate the VAR_EXPR with proper size. */
8774 total_var = gfc_count_forall_iterators (code);
8776 /* Allocate VAR_EXPR with NUMBER_OF_FORALL_INDEX elements. */
8777 var_expr = XCNEWVEC (gfc_expr *, total_var);
8780 /* The information about FORALL iterator, including FORALL index start, end
8781 and stride. The FORALL index can not appear in start, end or stride. */
8782 for (fa = code->ext.forall_iterator; fa; fa = fa->next)
8784 /* Check if any outer FORALL index name is the same as the current
8786 for (i = 0; i < nvar; i++)
8788 if (fa->var->symtree->n.sym == var_expr[i]->symtree->n.sym)
8790 gfc_error ("An outer FORALL construct already has an index "
8791 "with this name %L", &fa->var->where);
8795 /* Record the current FORALL index. */
8796 var_expr[nvar] = gfc_copy_expr (fa->var);
8800 /* No memory leak. */
8801 gcc_assert (nvar <= total_var);
8804 /* Resolve the FORALL body. */
8805 gfc_resolve_forall_body (code, nvar, var_expr);
8807 /* May call gfc_resolve_forall to resolve the inner FORALL loop. */
8808 gfc_resolve_blocks (code->block, ns);
8812 /* Free only the VAR_EXPRs allocated in this frame. */
8813 for (i = nvar; i < tmp; i++)
8814 gfc_free_expr (var_expr[i]);
8818 /* We are in the outermost FORALL construct. */
8819 gcc_assert (forall_save == 0);
8821 /* VAR_EXPR is not needed any more. */
8828 /* Resolve a BLOCK construct statement. */
8831 resolve_block_construct (gfc_code* code)
8833 /* Resolve the BLOCK's namespace. */
8834 gfc_resolve (code->ext.block.ns);
8836 /* For an ASSOCIATE block, the associations (and their targets) are already
8837 resolved during resolve_symbol. */
8841 /* Resolve lists of blocks found in IF, SELECT CASE, WHERE, FORALL, GOTO and
8844 static void resolve_code (gfc_code *, gfc_namespace *);
8847 gfc_resolve_blocks (gfc_code *b, gfc_namespace *ns)
8851 for (; b; b = b->block)
8853 t = gfc_resolve_expr (b->expr1);
8854 if (gfc_resolve_expr (b->expr2) == FAILURE)
8860 if (t == SUCCESS && b->expr1 != NULL
8861 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank != 0))
8862 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
8869 && (b->expr1->ts.type != BT_LOGICAL || b->expr1->rank == 0))
8870 gfc_error ("WHERE/ELSEWHERE clause at %L requires a LOGICAL array",
8875 resolve_branch (b->label1, b);
8879 resolve_block_construct (b);
8883 case EXEC_SELECT_TYPE:
8887 case EXEC_DO_CONCURRENT:
8895 case EXEC_OMP_ATOMIC:
8896 case EXEC_OMP_CRITICAL:
8898 case EXEC_OMP_MASTER:
8899 case EXEC_OMP_ORDERED:
8900 case EXEC_OMP_PARALLEL:
8901 case EXEC_OMP_PARALLEL_DO:
8902 case EXEC_OMP_PARALLEL_SECTIONS:
8903 case EXEC_OMP_PARALLEL_WORKSHARE:
8904 case EXEC_OMP_SECTIONS:
8905 case EXEC_OMP_SINGLE:
8907 case EXEC_OMP_TASKWAIT:
8908 case EXEC_OMP_TASKYIELD:
8909 case EXEC_OMP_WORKSHARE:
8913 gfc_internal_error ("gfc_resolve_blocks(): Bad block type");
8916 resolve_code (b->next, ns);
8921 /* Does everything to resolve an ordinary assignment. Returns true
8922 if this is an interface assignment. */
8924 resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
8934 if (gfc_extend_assign (code, ns) == SUCCESS)
8938 if (code->op == EXEC_ASSIGN_CALL)
8940 lhs = code->ext.actual->expr;
8941 rhsptr = &code->ext.actual->next->expr;
8945 gfc_actual_arglist* args;
8946 gfc_typebound_proc* tbp;
8948 gcc_assert (code->op == EXEC_COMPCALL);
8950 args = code->expr1->value.compcall.actual;
8952 rhsptr = &args->next->expr;
8954 tbp = code->expr1->value.compcall.tbp;
8955 gcc_assert (!tbp->is_generic);
8958 /* Make a temporary rhs when there is a default initializer
8959 and rhs is the same symbol as the lhs. */
8960 if ((*rhsptr)->expr_type == EXPR_VARIABLE
8961 && (*rhsptr)->symtree->n.sym->ts.type == BT_DERIVED
8962 && gfc_has_default_initializer ((*rhsptr)->symtree->n.sym->ts.u.derived)
8963 && (lhs->symtree->n.sym == (*rhsptr)->symtree->n.sym))
8964 *rhsptr = gfc_get_parentheses (*rhsptr);
8973 && gfc_notify_std (GFC_STD_GNU, "Extension: BOZ literal at %L outside "
8974 "a DATA statement and outside INT/REAL/DBLE/CMPLX",
8975 &code->loc) == FAILURE)
8978 /* Handle the case of a BOZ literal on the RHS. */
8979 if (rhs->is_boz && lhs->ts.type != BT_INTEGER)
8982 if (gfc_option.warn_surprising)
8983 gfc_warning ("BOZ literal at %L is bitwise transferred "
8984 "non-integer symbol '%s'", &code->loc,
8985 lhs->symtree->n.sym->name);
8987 if (!gfc_convert_boz (rhs, &lhs->ts))
8989 if ((rc = gfc_range_check (rhs)) != ARITH_OK)
8991 if (rc == ARITH_UNDERFLOW)
8992 gfc_error ("Arithmetic underflow of bit-wise transferred BOZ at %L"
8993 ". This check can be disabled with the option "
8994 "-fno-range-check", &rhs->where);
8995 else if (rc == ARITH_OVERFLOW)
8996 gfc_error ("Arithmetic overflow of bit-wise transferred BOZ at %L"
8997 ". This check can be disabled with the option "
8998 "-fno-range-check", &rhs->where);
8999 else if (rc == ARITH_NAN)
9000 gfc_error ("Arithmetic NaN of bit-wise transferred BOZ at %L"
9001 ". This check can be disabled with the option "
9002 "-fno-range-check", &rhs->where);
9007 if (lhs->ts.type == BT_CHARACTER
9008 && gfc_option.warn_character_truncation)
9010 if (lhs->ts.u.cl != NULL
9011 && lhs->ts.u.cl->length != NULL
9012 && lhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9013 llen = mpz_get_si (lhs->ts.u.cl->length->value.integer);
9015 if (rhs->expr_type == EXPR_CONSTANT)
9016 rlen = rhs->value.character.length;
9018 else if (rhs->ts.u.cl != NULL
9019 && rhs->ts.u.cl->length != NULL
9020 && rhs->ts.u.cl->length->expr_type == EXPR_CONSTANT)
9021 rlen = mpz_get_si (rhs->ts.u.cl->length->value.integer);
9023 if (rlen && llen && rlen > llen)
9024 gfc_warning_now ("CHARACTER expression will be truncated "
9025 "in assignment (%d/%d) at %L",
9026 llen, rlen, &code->loc);
9029 /* Ensure that a vector index expression for the lvalue is evaluated
9030 to a temporary if the lvalue symbol is referenced in it. */
9033 for (ref = lhs->ref; ref; ref= ref->next)
9034 if (ref->type == REF_ARRAY)
9036 for (n = 0; n < ref->u.ar.dimen; n++)
9037 if (ref->u.ar.dimen_type[n] == DIMEN_VECTOR
9038 && gfc_find_sym_in_expr (lhs->symtree->n.sym,
9039 ref->u.ar.start[n]))
9041 = gfc_get_parentheses (ref->u.ar.start[n]);
9045 if (gfc_pure (NULL))
9047 if (lhs->ts.type == BT_DERIVED
9048 && lhs->expr_type == EXPR_VARIABLE
9049 && lhs->ts.u.derived->attr.pointer_comp
9050 && rhs->expr_type == EXPR_VARIABLE
9051 && (gfc_impure_variable (rhs->symtree->n.sym)
9052 || gfc_is_coindexed (rhs)))
9055 if (gfc_is_coindexed (rhs))
9056 gfc_error ("Coindexed expression at %L is assigned to "
9057 "a derived type variable with a POINTER "
9058 "component in a PURE procedure",
9061 gfc_error ("The impure variable at %L is assigned to "
9062 "a derived type variable with a POINTER "
9063 "component in a PURE procedure (12.6)",
9068 /* Fortran 2008, C1283. */
9069 if (gfc_is_coindexed (lhs))
9071 gfc_error ("Assignment to coindexed variable at %L in a PURE "
9072 "procedure", &rhs->where);
9077 if (gfc_implicit_pure (NULL))
9079 if (lhs->expr_type == EXPR_VARIABLE
9080 && lhs->symtree->n.sym != gfc_current_ns->proc_name
9081 && lhs->symtree->n.sym->ns != gfc_current_ns)
9082 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9084 if (lhs->ts.type == BT_DERIVED
9085 && lhs->expr_type == EXPR_VARIABLE
9086 && lhs->ts.u.derived->attr.pointer_comp
9087 && rhs->expr_type == EXPR_VARIABLE
9088 && (gfc_impure_variable (rhs->symtree->n.sym)
9089 || gfc_is_coindexed (rhs)))
9090 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9092 /* Fortran 2008, C1283. */
9093 if (gfc_is_coindexed (lhs))
9094 gfc_current_ns->proc_name->attr.implicit_pure = 0;
9098 /* FIXME: Valid in Fortran 2008, unless the LHS is both polymorphic
9099 and coindexed; cf. F2008, 7.2.1.2 and PR 43366. */
9100 if (lhs->ts.type == BT_CLASS)
9102 gfc_error ("Variable must not be polymorphic in assignment at %L",
9107 /* F2008, Section 7.2.1.2. */
9108 if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
9110 gfc_error ("Coindexed variable must not be have an allocatable ultimate "
9111 "component in assignment at %L", &lhs->where);
9115 gfc_check_assign (lhs, rhs, 1);
9120 /* Given a block of code, recursively resolve everything pointed to by this
9124 resolve_code (gfc_code *code, gfc_namespace *ns)
9126 int omp_workshare_save;
9127 int forall_save, do_concurrent_save;
9131 frame.prev = cs_base;
9135 find_reachable_labels (code);
9137 for (; code; code = code->next)
9139 frame.current = code;
9140 forall_save = forall_flag;
9141 do_concurrent_save = do_concurrent_flag;
9143 if (code->op == EXEC_FORALL)
9146 gfc_resolve_forall (code, ns, forall_save);
9149 else if (code->block)
9151 omp_workshare_save = -1;
9154 case EXEC_OMP_PARALLEL_WORKSHARE:
9155 omp_workshare_save = omp_workshare_flag;
9156 omp_workshare_flag = 1;
9157 gfc_resolve_omp_parallel_blocks (code, ns);
9159 case EXEC_OMP_PARALLEL:
9160 case EXEC_OMP_PARALLEL_DO:
9161 case EXEC_OMP_PARALLEL_SECTIONS:
9163 omp_workshare_save = omp_workshare_flag;
9164 omp_workshare_flag = 0;
9165 gfc_resolve_omp_parallel_blocks (code, ns);
9168 gfc_resolve_omp_do_blocks (code, ns);
9170 case EXEC_SELECT_TYPE:
9171 /* Blocks are handled in resolve_select_type because we have
9172 to transform the SELECT TYPE into ASSOCIATE first. */
9174 case EXEC_DO_CONCURRENT:
9175 do_concurrent_flag = 1;
9176 gfc_resolve_blocks (code->block, ns);
9177 do_concurrent_flag = 2;
9179 case EXEC_OMP_WORKSHARE:
9180 omp_workshare_save = omp_workshare_flag;
9181 omp_workshare_flag = 1;
9184 gfc_resolve_blocks (code->block, ns);
9188 if (omp_workshare_save != -1)
9189 omp_workshare_flag = omp_workshare_save;
9193 if (code->op != EXEC_COMPCALL && code->op != EXEC_CALL_PPC)
9194 t = gfc_resolve_expr (code->expr1);
9195 forall_flag = forall_save;
9196 do_concurrent_flag = do_concurrent_save;
9198 if (gfc_resolve_expr (code->expr2) == FAILURE)
9201 if (code->op == EXEC_ALLOCATE
9202 && gfc_resolve_expr (code->expr3) == FAILURE)
9208 case EXEC_END_BLOCK:
9209 case EXEC_END_NESTED_BLOCK:
9213 case EXEC_ERROR_STOP:
9217 case EXEC_ASSIGN_CALL:
9222 case EXEC_SYNC_IMAGES:
9223 case EXEC_SYNC_MEMORY:
9224 resolve_sync (code);
9229 resolve_lock_unlock (code);
9233 /* Keep track of which entry we are up to. */
9234 current_entry_id = code->ext.entry->id;
9238 resolve_where (code, NULL);
9242 if (code->expr1 != NULL)
9244 if (code->expr1->ts.type != BT_INTEGER)
9245 gfc_error ("ASSIGNED GOTO statement at %L requires an "
9246 "INTEGER variable", &code->expr1->where);
9247 else if (code->expr1->symtree->n.sym->attr.assign != 1)
9248 gfc_error ("Variable '%s' has not been assigned a target "
9249 "label at %L", code->expr1->symtree->n.sym->name,
9250 &code->expr1->where);
9253 resolve_branch (code->label1, code);
9257 if (code->expr1 != NULL
9258 && (code->expr1->ts.type != BT_INTEGER || code->expr1->rank))
9259 gfc_error ("Alternate RETURN statement at %L requires a SCALAR-"
9260 "INTEGER return specifier", &code->expr1->where);
9263 case EXEC_INIT_ASSIGN:
9264 case EXEC_END_PROCEDURE:
9271 if (gfc_check_vardef_context (code->expr1, false, false,
9272 _("assignment")) == FAILURE)
9275 if (resolve_ordinary_assign (code, ns))
9277 if (code->op == EXEC_COMPCALL)
9284 case EXEC_LABEL_ASSIGN:
9285 if (code->label1->defined == ST_LABEL_UNKNOWN)
9286 gfc_error ("Label %d referenced at %L is never defined",
9287 code->label1->value, &code->label1->where);
9289 && (code->expr1->expr_type != EXPR_VARIABLE
9290 || code->expr1->symtree->n.sym->ts.type != BT_INTEGER
9291 || code->expr1->symtree->n.sym->ts.kind
9292 != gfc_default_integer_kind
9293 || code->expr1->symtree->n.sym->as != NULL))
9294 gfc_error ("ASSIGN statement at %L requires a scalar "
9295 "default INTEGER variable", &code->expr1->where);
9298 case EXEC_POINTER_ASSIGN:
9305 /* This is both a variable definition and pointer assignment
9306 context, so check both of them. For rank remapping, a final
9307 array ref may be present on the LHS and fool gfc_expr_attr
9308 used in gfc_check_vardef_context. Remove it. */
9309 e = remove_last_array_ref (code->expr1);
9310 t = gfc_check_vardef_context (e, true, false,
9311 _("pointer assignment"));
9313 t = gfc_check_vardef_context (e, false, false,
9314 _("pointer assignment"));
9319 gfc_check_pointer_assign (code->expr1, code->expr2);
9323 case EXEC_ARITHMETIC_IF:
9325 && code->expr1->ts.type != BT_INTEGER
9326 && code->expr1->ts.type != BT_REAL)
9327 gfc_error ("Arithmetic IF statement at %L requires a numeric "
9328 "expression", &code->expr1->where);
9330 resolve_branch (code->label1, code);
9331 resolve_branch (code->label2, code);
9332 resolve_branch (code->label3, code);
9336 if (t == SUCCESS && code->expr1 != NULL
9337 && (code->expr1->ts.type != BT_LOGICAL
9338 || code->expr1->rank != 0))
9339 gfc_error ("IF clause at %L requires a scalar LOGICAL expression",
9340 &code->expr1->where);
9345 resolve_call (code);
9350 resolve_typebound_subroutine (code);
9354 resolve_ppc_call (code);
9358 /* Select is complicated. Also, a SELECT construct could be
9359 a transformed computed GOTO. */
9360 resolve_select (code);
9363 case EXEC_SELECT_TYPE:
9364 resolve_select_type (code, ns);
9368 resolve_block_construct (code);
9372 if (code->ext.iterator != NULL)
9374 gfc_iterator *iter = code->ext.iterator;
9375 if (gfc_resolve_iterator (iter, true) != FAILURE)
9376 gfc_resolve_do_iterator (code, iter->var->symtree->n.sym);
9381 if (code->expr1 == NULL)
9382 gfc_internal_error ("resolve_code(): No expression on DO WHILE");
9384 && (code->expr1->rank != 0
9385 || code->expr1->ts.type != BT_LOGICAL))
9386 gfc_error ("Exit condition of DO WHILE loop at %L must be "
9387 "a scalar LOGICAL expression", &code->expr1->where);
9392 resolve_allocate_deallocate (code, "ALLOCATE");
9396 case EXEC_DEALLOCATE:
9398 resolve_allocate_deallocate (code, "DEALLOCATE");
9403 if (gfc_resolve_open (code->ext.open) == FAILURE)
9406 resolve_branch (code->ext.open->err, code);
9410 if (gfc_resolve_close (code->ext.close) == FAILURE)
9413 resolve_branch (code->ext.close->err, code);
9416 case EXEC_BACKSPACE:
9420 if (gfc_resolve_filepos (code->ext.filepos) == FAILURE)
9423 resolve_branch (code->ext.filepos->err, code);
9427 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9430 resolve_branch (code->ext.inquire->err, code);
9434 gcc_assert (code->ext.inquire != NULL);
9435 if (gfc_resolve_inquire (code->ext.inquire) == FAILURE)
9438 resolve_branch (code->ext.inquire->err, code);
9442 if (gfc_resolve_wait (code->ext.wait) == FAILURE)
9445 resolve_branch (code->ext.wait->err, code);
9446 resolve_branch (code->ext.wait->end, code);
9447 resolve_branch (code->ext.wait->eor, code);
9452 if (gfc_resolve_dt (code->ext.dt, &code->loc) == FAILURE)
9455 resolve_branch (code->ext.dt->err, code);
9456 resolve_branch (code->ext.dt->end, code);
9457 resolve_branch (code->ext.dt->eor, code);
9461 resolve_transfer (code);
9464 case EXEC_DO_CONCURRENT:
9466 resolve_forall_iterators (code->ext.forall_iterator);
9468 if (code->expr1 != NULL
9469 && (code->expr1->ts.type != BT_LOGICAL || code->expr1->rank))
9470 gfc_error ("FORALL mask clause at %L requires a scalar LOGICAL "
9471 "expression", &code->expr1->where);
9474 case EXEC_OMP_ATOMIC:
9475 case EXEC_OMP_BARRIER:
9476 case EXEC_OMP_CRITICAL:
9477 case EXEC_OMP_FLUSH:
9479 case EXEC_OMP_MASTER:
9480 case EXEC_OMP_ORDERED:
9481 case EXEC_OMP_SECTIONS:
9482 case EXEC_OMP_SINGLE:
9483 case EXEC_OMP_TASKWAIT:
9484 case EXEC_OMP_TASKYIELD:
9485 case EXEC_OMP_WORKSHARE:
9486 gfc_resolve_omp_directive (code, ns);
9489 case EXEC_OMP_PARALLEL:
9490 case EXEC_OMP_PARALLEL_DO:
9491 case EXEC_OMP_PARALLEL_SECTIONS:
9492 case EXEC_OMP_PARALLEL_WORKSHARE:
9494 omp_workshare_save = omp_workshare_flag;
9495 omp_workshare_flag = 0;
9496 gfc_resolve_omp_directive (code, ns);
9497 omp_workshare_flag = omp_workshare_save;
9501 gfc_internal_error ("resolve_code(): Bad statement code");
9505 cs_base = frame.prev;
9509 /* Resolve initial values and make sure they are compatible with
9513 resolve_values (gfc_symbol *sym)
9517 if (sym->value == NULL)
9520 if (sym->value->expr_type == EXPR_STRUCTURE)
9521 t= resolve_structure_cons (sym->value, 1);
9523 t = gfc_resolve_expr (sym->value);
9528 gfc_check_assign_symbol (sym, sym->value);
9532 /* Verify the binding labels for common blocks that are BIND(C). The label
9533 for a BIND(C) common block must be identical in all scoping units in which
9534 the common block is declared. Further, the binding label can not collide
9535 with any other global entity in the program. */
9538 resolve_bind_c_comms (gfc_symtree *comm_block_tree)
9540 if (comm_block_tree->n.common->is_bind_c == 1)
9542 gfc_gsymbol *binding_label_gsym;
9543 gfc_gsymbol *comm_name_gsym;
9545 /* See if a global symbol exists by the common block's name. It may
9546 be NULL if the common block is use-associated. */
9547 comm_name_gsym = gfc_find_gsymbol (gfc_gsym_root,
9548 comm_block_tree->n.common->name);
9549 if (comm_name_gsym != NULL && comm_name_gsym->type != GSYM_COMMON)
9550 gfc_error ("Binding label '%s' for common block '%s' at %L collides "
9551 "with the global entity '%s' at %L",
9552 comm_block_tree->n.common->binding_label,
9553 comm_block_tree->n.common->name,
9554 &(comm_block_tree->n.common->where),
9555 comm_name_gsym->name, &(comm_name_gsym->where));
9556 else if (comm_name_gsym != NULL
9557 && strcmp (comm_name_gsym->name,
9558 comm_block_tree->n.common->name) == 0)
9560 /* TODO: Need to make sure the fields of gfc_gsymbol are initialized
9562 if (comm_name_gsym->binding_label == NULL)
9563 /* No binding label for common block stored yet; save this one. */
9564 comm_name_gsym->binding_label =
9565 comm_block_tree->n.common->binding_label;
9567 if (strcmp (comm_name_gsym->binding_label,
9568 comm_block_tree->n.common->binding_label) != 0)
9570 /* Common block names match but binding labels do not. */
9571 gfc_error ("Binding label '%s' for common block '%s' at %L "
9572 "does not match the binding label '%s' for common "
9574 comm_block_tree->n.common->binding_label,
9575 comm_block_tree->n.common->name,
9576 &(comm_block_tree->n.common->where),
9577 comm_name_gsym->binding_label,
9578 comm_name_gsym->name,
9579 &(comm_name_gsym->where));
9584 /* There is no binding label (NAME="") so we have nothing further to
9585 check and nothing to add as a global symbol for the label. */
9586 if (comm_block_tree->n.common->binding_label[0] == '\0' )
9589 binding_label_gsym =
9590 gfc_find_gsymbol (gfc_gsym_root,
9591 comm_block_tree->n.common->binding_label);
9592 if (binding_label_gsym == NULL)
9594 /* Need to make a global symbol for the binding label to prevent
9595 it from colliding with another. */
9596 binding_label_gsym =
9597 gfc_get_gsymbol (comm_block_tree->n.common->binding_label);
9598 binding_label_gsym->sym_name = comm_block_tree->n.common->name;
9599 binding_label_gsym->type = GSYM_COMMON;
9603 /* If comm_name_gsym is NULL, the name common block is use
9604 associated and the name could be colliding. */
9605 if (binding_label_gsym->type != GSYM_COMMON)
9606 gfc_error ("Binding label '%s' for common block '%s' at %L "
9607 "collides with the global entity '%s' at %L",
9608 comm_block_tree->n.common->binding_label,
9609 comm_block_tree->n.common->name,
9610 &(comm_block_tree->n.common->where),
9611 binding_label_gsym->name,
9612 &(binding_label_gsym->where));
9613 else if (comm_name_gsym != NULL
9614 && (strcmp (binding_label_gsym->name,
9615 comm_name_gsym->binding_label) != 0)
9616 && (strcmp (binding_label_gsym->sym_name,
9617 comm_name_gsym->name) != 0))
9618 gfc_error ("Binding label '%s' for common block '%s' at %L "
9619 "collides with global entity '%s' at %L",
9620 binding_label_gsym->name, binding_label_gsym->sym_name,
9621 &(comm_block_tree->n.common->where),
9622 comm_name_gsym->name, &(comm_name_gsym->where));
9630 /* Verify any BIND(C) derived types in the namespace so we can report errors
9631 for them once, rather than for each variable declared of that type. */
9634 resolve_bind_c_derived_types (gfc_symbol *derived_sym)
9636 if (derived_sym != NULL && derived_sym->attr.flavor == FL_DERIVED
9637 && derived_sym->attr.is_bind_c == 1)
9638 verify_bind_c_derived_type (derived_sym);
9644 /* Verify that any binding labels used in a given namespace do not collide
9645 with the names or binding labels of any global symbols. */
9648 gfc_verify_binding_labels (gfc_symbol *sym)
9652 if (sym != NULL && sym->attr.is_bind_c && sym->attr.is_iso_c == 0
9653 && sym->attr.flavor != FL_DERIVED && sym->binding_label[0] != '\0')
9655 gfc_gsymbol *bind_c_sym;
9657 bind_c_sym = gfc_find_gsymbol (gfc_gsym_root, sym->binding_label);
9658 if (bind_c_sym != NULL
9659 && strcmp (bind_c_sym->name, sym->binding_label) == 0)
9661 if (sym->attr.if_source == IFSRC_DECL
9662 && (bind_c_sym->type != GSYM_SUBROUTINE
9663 && bind_c_sym->type != GSYM_FUNCTION)
9664 && ((sym->attr.contained == 1
9665 && strcmp (bind_c_sym->sym_name, sym->name) != 0)
9666 || (sym->attr.use_assoc == 1
9667 && (strcmp (bind_c_sym->mod_name, sym->module) != 0))))
9669 /* Make sure global procedures don't collide with anything. */
9670 gfc_error ("Binding label '%s' at %L collides with the global "
9671 "entity '%s' at %L", sym->binding_label,
9672 &(sym->declared_at), bind_c_sym->name,
9673 &(bind_c_sym->where));
9676 else if (sym->attr.contained == 0
9677 && (sym->attr.if_source == IFSRC_IFBODY
9678 && sym->attr.flavor == FL_PROCEDURE)
9679 && (bind_c_sym->sym_name != NULL
9680 && strcmp (bind_c_sym->sym_name, sym->name) != 0))
9682 /* Make sure procedures in interface bodies don't collide. */
9683 gfc_error ("Binding label '%s' in interface body at %L collides "
9684 "with the global entity '%s' at %L",
9686 &(sym->declared_at), bind_c_sym->name,
9687 &(bind_c_sym->where));
9690 else if (sym->attr.contained == 0
9691 && sym->attr.if_source == IFSRC_UNKNOWN)
9692 if ((sym->attr.use_assoc && bind_c_sym->mod_name
9693 && strcmp (bind_c_sym->mod_name, sym->module) != 0)
9694 || sym->attr.use_assoc == 0)
9696 gfc_error ("Binding label '%s' at %L collides with global "
9697 "entity '%s' at %L", sym->binding_label,
9698 &(sym->declared_at), bind_c_sym->name,
9699 &(bind_c_sym->where));
9704 /* Clear the binding label to prevent checking multiple times. */
9705 sym->binding_label[0] = '\0';
9707 else if (bind_c_sym == NULL)
9709 bind_c_sym = gfc_get_gsymbol (sym->binding_label);
9710 bind_c_sym->where = sym->declared_at;
9711 bind_c_sym->sym_name = sym->name;
9713 if (sym->attr.use_assoc == 1)
9714 bind_c_sym->mod_name = sym->module;
9716 if (sym->ns->proc_name != NULL)
9717 bind_c_sym->mod_name = sym->ns->proc_name->name;
9719 if (sym->attr.contained == 0)
9721 if (sym->attr.subroutine)
9722 bind_c_sym->type = GSYM_SUBROUTINE;
9723 else if (sym->attr.function)
9724 bind_c_sym->type = GSYM_FUNCTION;
9732 /* Resolve an index expression. */
9735 resolve_index_expr (gfc_expr *e)
9737 if (gfc_resolve_expr (e) == FAILURE)
9740 if (gfc_simplify_expr (e, 0) == FAILURE)
9743 if (gfc_specification_expr (e) == FAILURE)
9750 /* Resolve a charlen structure. */
9753 resolve_charlen (gfc_charlen *cl)
9762 specification_expr = 1;
9764 if (resolve_index_expr (cl->length) == FAILURE)
9766 specification_expr = 0;
9770 /* "If the character length parameter value evaluates to a negative
9771 value, the length of character entities declared is zero." */
9772 if (cl->length && !gfc_extract_int (cl->length, &i) && i < 0)
9774 if (gfc_option.warn_surprising)
9775 gfc_warning_now ("CHARACTER variable at %L has negative length %d,"
9776 " the length has been set to zero",
9777 &cl->length->where, i);
9778 gfc_replace_expr (cl->length,
9779 gfc_get_int_expr (gfc_default_integer_kind, NULL, 0));
9782 /* Check that the character length is not too large. */
9783 k = gfc_validate_kind (BT_INTEGER, gfc_charlen_int_kind, false);
9784 if (cl->length && cl->length->expr_type == EXPR_CONSTANT
9785 && cl->length->ts.type == BT_INTEGER
9786 && mpz_cmp (cl->length->value.integer, gfc_integer_kinds[k].huge) > 0)
9788 gfc_error ("String length at %L is too large", &cl->length->where);
9796 /* Test for non-constant shape arrays. */
9799 is_non_constant_shape_array (gfc_symbol *sym)
9805 not_constant = false;
9806 if (sym->as != NULL)
9808 /* Unfortunately, !gfc_is_compile_time_shape hits a legal case that
9809 has not been simplified; parameter array references. Do the
9810 simplification now. */
9811 for (i = 0; i < sym->as->rank + sym->as->corank; i++)
9813 e = sym->as->lower[i];
9814 if (e && (resolve_index_expr (e) == FAILURE
9815 || !gfc_is_constant_expr (e)))
9816 not_constant = true;
9817 e = sym->as->upper[i];
9818 if (e && (resolve_index_expr (e) == FAILURE
9819 || !gfc_is_constant_expr (e)))
9820 not_constant = true;
9823 return not_constant;
9826 /* Given a symbol and an initialization expression, add code to initialize
9827 the symbol to the function entry. */
9829 build_init_assign (gfc_symbol *sym, gfc_expr *init)
9833 gfc_namespace *ns = sym->ns;
9835 /* Search for the function namespace if this is a contained
9836 function without an explicit result. */
9837 if (sym->attr.function && sym == sym->result
9838 && sym->name != sym->ns->proc_name->name)
9841 for (;ns; ns = ns->sibling)
9842 if (strcmp (ns->proc_name->name, sym->name) == 0)
9848 gfc_free_expr (init);
9852 /* Build an l-value expression for the result. */
9853 lval = gfc_lval_expr_from_sym (sym);
9855 /* Add the code at scope entry. */
9856 init_st = gfc_get_code ();
9857 init_st->next = ns->code;
9860 /* Assign the default initializer to the l-value. */
9861 init_st->loc = sym->declared_at;
9862 init_st->op = EXEC_INIT_ASSIGN;
9863 init_st->expr1 = lval;
9864 init_st->expr2 = init;
9867 /* Assign the default initializer to a derived type variable or result. */
9870 apply_default_init (gfc_symbol *sym)
9872 gfc_expr *init = NULL;
9874 if (sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
9877 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived)
9878 init = gfc_default_initializer (&sym->ts);
9880 if (init == NULL && sym->ts.type != BT_CLASS)
9883 build_init_assign (sym, init);
9884 sym->attr.referenced = 1;
9887 /* Build an initializer for a local integer, real, complex, logical, or
9888 character variable, based on the command line flags finit-local-zero,
9889 finit-integer=, finit-real=, finit-logical=, and finit-runtime. Returns
9890 null if the symbol should not have a default initialization. */
9892 build_default_init_expr (gfc_symbol *sym)
9895 gfc_expr *init_expr;
9898 /* These symbols should never have a default initialization. */
9899 if ((sym->attr.dimension && !gfc_is_compile_time_shape (sym->as))
9900 || sym->attr.external
9902 || sym->attr.pointer
9903 || sym->attr.in_equivalence
9904 || sym->attr.in_common
9907 || sym->attr.cray_pointee
9908 || sym->attr.cray_pointer)
9911 /* Now we'll try to build an initializer expression. */
9912 init_expr = gfc_get_constant_expr (sym->ts.type, sym->ts.kind,
9915 /* We will only initialize integers, reals, complex, logicals, and
9916 characters, and only if the corresponding command-line flags
9917 were set. Otherwise, we free init_expr and return null. */
9918 switch (sym->ts.type)
9921 if (gfc_option.flag_init_integer != GFC_INIT_INTEGER_OFF)
9922 mpz_set_si (init_expr->value.integer,
9923 gfc_option.flag_init_integer_value);
9926 gfc_free_expr (init_expr);
9932 switch (gfc_option.flag_init_real)
9934 case GFC_INIT_REAL_SNAN:
9935 init_expr->is_snan = 1;
9937 case GFC_INIT_REAL_NAN:
9938 mpfr_set_nan (init_expr->value.real);
9941 case GFC_INIT_REAL_INF:
9942 mpfr_set_inf (init_expr->value.real, 1);
9945 case GFC_INIT_REAL_NEG_INF:
9946 mpfr_set_inf (init_expr->value.real, -1);
9949 case GFC_INIT_REAL_ZERO:
9950 mpfr_set_ui (init_expr->value.real, 0.0, GFC_RND_MODE);
9954 gfc_free_expr (init_expr);
9961 switch (gfc_option.flag_init_real)
9963 case GFC_INIT_REAL_SNAN:
9964 init_expr->is_snan = 1;
9966 case GFC_INIT_REAL_NAN:
9967 mpfr_set_nan (mpc_realref (init_expr->value.complex));
9968 mpfr_set_nan (mpc_imagref (init_expr->value.complex));
9971 case GFC_INIT_REAL_INF:
9972 mpfr_set_inf (mpc_realref (init_expr->value.complex), 1);
9973 mpfr_set_inf (mpc_imagref (init_expr->value.complex), 1);
9976 case GFC_INIT_REAL_NEG_INF:
9977 mpfr_set_inf (mpc_realref (init_expr->value.complex), -1);
9978 mpfr_set_inf (mpc_imagref (init_expr->value.complex), -1);
9981 case GFC_INIT_REAL_ZERO:
9982 mpc_set_ui (init_expr->value.complex, 0, GFC_MPC_RND_MODE);
9986 gfc_free_expr (init_expr);
9993 if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_FALSE)
9994 init_expr->value.logical = 0;
9995 else if (gfc_option.flag_init_logical == GFC_INIT_LOGICAL_TRUE)
9996 init_expr->value.logical = 1;
9999 gfc_free_expr (init_expr);
10005 /* For characters, the length must be constant in order to
10006 create a default initializer. */
10007 if (gfc_option.flag_init_character == GFC_INIT_CHARACTER_ON
10008 && sym->ts.u.cl->length
10009 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
10011 char_len = mpz_get_si (sym->ts.u.cl->length->value.integer);
10012 init_expr->value.character.length = char_len;
10013 init_expr->value.character.string = gfc_get_wide_string (char_len+1);
10014 for (i = 0; i < char_len; i++)
10015 init_expr->value.character.string[i]
10016 = (unsigned char) gfc_option.flag_init_character_value;
10020 gfc_free_expr (init_expr);
10026 gfc_free_expr (init_expr);
10032 /* Add an initialization expression to a local variable. */
10034 apply_default_init_local (gfc_symbol *sym)
10036 gfc_expr *init = NULL;
10038 /* The symbol should be a variable or a function return value. */
10039 if ((sym->attr.flavor != FL_VARIABLE && !sym->attr.function)
10040 || (sym->attr.function && sym->result != sym))
10043 /* Try to build the initializer expression. If we can't initialize
10044 this symbol, then init will be NULL. */
10045 init = build_default_init_expr (sym);
10049 /* For saved variables, we don't want to add an initializer at
10050 function entry, so we just add a static initializer. */
10051 if (sym->attr.save || sym->ns->save_all
10052 || gfc_option.flag_max_stack_var_size == 0)
10054 /* Don't clobber an existing initializer! */
10055 gcc_assert (sym->value == NULL);
10060 build_init_assign (sym, init);
10064 /* Resolution of common features of flavors variable and procedure. */
10067 resolve_fl_var_and_proc (gfc_symbol *sym, int mp_flag)
10069 /* Avoid double diagnostics for function result symbols. */
10070 if ((sym->result || sym->attr.result) && !sym->attr.dummy
10071 && (sym->ns != gfc_current_ns))
10074 /* Constraints on deferred shape variable. */
10075 if (sym->as == NULL || sym->as->type != AS_DEFERRED)
10077 if (sym->attr.allocatable)
10079 if (sym->attr.dimension)
10081 gfc_error ("Allocatable array '%s' at %L must have "
10082 "a deferred shape", sym->name, &sym->declared_at);
10085 else if (gfc_notify_std (GFC_STD_F2003, "Scalar object '%s' at %L "
10086 "may not be ALLOCATABLE", sym->name,
10087 &sym->declared_at) == FAILURE)
10091 if (sym->attr.pointer && sym->attr.dimension)
10093 gfc_error ("Array pointer '%s' at %L must have a deferred shape",
10094 sym->name, &sym->declared_at);
10100 if (!mp_flag && !sym->attr.allocatable && !sym->attr.pointer
10101 && sym->ts.type != BT_CLASS && !sym->assoc)
10103 gfc_error ("Array '%s' at %L cannot have a deferred shape",
10104 sym->name, &sym->declared_at);
10109 /* Constraints on polymorphic variables. */
10110 if (sym->ts.type == BT_CLASS && !(sym->result && sym->result != sym))
10113 if (sym->attr.class_ok
10114 && !gfc_type_is_extensible (CLASS_DATA (sym)->ts.u.derived))
10116 gfc_error ("Type '%s' of CLASS variable '%s' at %L is not extensible",
10117 CLASS_DATA (sym)->ts.u.derived->name, sym->name,
10118 &sym->declared_at);
10123 /* Assume that use associated symbols were checked in the module ns.
10124 Class-variables that are associate-names are also something special
10125 and excepted from the test. */
10126 if (!sym->attr.class_ok && !sym->attr.use_assoc && !sym->assoc)
10128 gfc_error ("CLASS variable '%s' at %L must be dummy, allocatable "
10129 "or pointer", sym->name, &sym->declared_at);
10138 /* Additional checks for symbols with flavor variable and derived
10139 type. To be called from resolve_fl_variable. */
10142 resolve_fl_variable_derived (gfc_symbol *sym, int no_init_flag)
10144 gcc_assert (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS);
10146 /* Check to see if a derived type is blocked from being host
10147 associated by the presence of another class I symbol in the same
10148 namespace. 14.6.1.3 of the standard and the discussion on
10149 comp.lang.fortran. */
10150 if (sym->ns != sym->ts.u.derived->ns
10151 && sym->ns->proc_name->attr.if_source != IFSRC_IFBODY)
10154 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 0, &s);
10155 if (s && s->attr.flavor != FL_DERIVED)
10157 gfc_error ("The type '%s' cannot be host associated at %L "
10158 "because it is blocked by an incompatible object "
10159 "of the same name declared at %L",
10160 sym->ts.u.derived->name, &sym->declared_at,
10166 /* 4th constraint in section 11.3: "If an object of a type for which
10167 component-initialization is specified (R429) appears in the
10168 specification-part of a module and does not have the ALLOCATABLE
10169 or POINTER attribute, the object shall have the SAVE attribute."
10171 The check for initializers is performed with
10172 gfc_has_default_initializer because gfc_default_initializer generates
10173 a hidden default for allocatable components. */
10174 if (!(sym->value || no_init_flag) && sym->ns->proc_name
10175 && sym->ns->proc_name->attr.flavor == FL_MODULE
10176 && !sym->ns->save_all && !sym->attr.save
10177 && !sym->attr.pointer && !sym->attr.allocatable
10178 && gfc_has_default_initializer (sym->ts.u.derived)
10179 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Implied SAVE for "
10180 "module variable '%s' at %L, needed due to "
10181 "the default initialization", sym->name,
10182 &sym->declared_at) == FAILURE)
10185 /* Assign default initializer. */
10186 if (!(sym->value || sym->attr.pointer || sym->attr.allocatable)
10187 && (!no_init_flag || sym->attr.intent == INTENT_OUT))
10189 sym->value = gfc_default_initializer (&sym->ts);
10196 /* Resolve symbols with flavor variable. */
10199 resolve_fl_variable (gfc_symbol *sym, int mp_flag)
10201 int no_init_flag, automatic_flag;
10203 const char *auto_save_msg;
10205 auto_save_msg = "Automatic object '%s' at %L cannot have the "
10208 if (resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10211 /* Set this flag to check that variables are parameters of all entries.
10212 This check is effected by the call to gfc_resolve_expr through
10213 is_non_constant_shape_array. */
10214 specification_expr = 1;
10216 if (sym->ns->proc_name
10217 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10218 || sym->ns->proc_name->attr.is_main_program)
10219 && !sym->attr.use_assoc
10220 && !sym->attr.allocatable
10221 && !sym->attr.pointer
10222 && is_non_constant_shape_array (sym))
10224 /* The shape of a main program or module array needs to be
10226 gfc_error ("The module or main program array '%s' at %L must "
10227 "have constant shape", sym->name, &sym->declared_at);
10228 specification_expr = 0;
10232 /* Constraints on deferred type parameter. */
10233 if (sym->ts.deferred && !(sym->attr.pointer || sym->attr.allocatable))
10235 gfc_error ("Entity '%s' at %L has a deferred type parameter and "
10236 "requires either the pointer or allocatable attribute",
10237 sym->name, &sym->declared_at);
10241 if (sym->ts.type == BT_CHARACTER)
10243 /* Make sure that character string variables with assumed length are
10244 dummy arguments. */
10245 e = sym->ts.u.cl->length;
10246 if (e == NULL && !sym->attr.dummy && !sym->attr.result
10247 && !sym->ts.deferred)
10249 gfc_error ("Entity with assumed character length at %L must be a "
10250 "dummy argument or a PARAMETER", &sym->declared_at);
10254 if (e && sym->attr.save == SAVE_EXPLICIT && !gfc_is_constant_expr (e))
10256 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10260 if (!gfc_is_constant_expr (e)
10261 && !(e->expr_type == EXPR_VARIABLE
10262 && e->symtree->n.sym->attr.flavor == FL_PARAMETER))
10264 if (!sym->attr.use_assoc && sym->ns->proc_name
10265 && (sym->ns->proc_name->attr.flavor == FL_MODULE
10266 || sym->ns->proc_name->attr.is_main_program))
10268 gfc_error ("'%s' at %L must have constant character length "
10269 "in this context", sym->name, &sym->declared_at);
10272 if (sym->attr.in_common)
10274 gfc_error ("COMMON variable '%s' at %L must have constant "
10275 "character length", sym->name, &sym->declared_at);
10281 if (sym->value == NULL && sym->attr.referenced)
10282 apply_default_init_local (sym); /* Try to apply a default initialization. */
10284 /* Determine if the symbol may not have an initializer. */
10285 no_init_flag = automatic_flag = 0;
10286 if (sym->attr.allocatable || sym->attr.external || sym->attr.dummy
10287 || sym->attr.intrinsic || sym->attr.result)
10289 else if ((sym->attr.dimension || sym->attr.codimension) && !sym->attr.pointer
10290 && is_non_constant_shape_array (sym))
10292 no_init_flag = automatic_flag = 1;
10294 /* Also, they must not have the SAVE attribute.
10295 SAVE_IMPLICIT is checked below. */
10296 if (sym->as && sym->attr.codimension)
10298 int corank = sym->as->corank;
10299 sym->as->corank = 0;
10300 no_init_flag = automatic_flag = is_non_constant_shape_array (sym);
10301 sym->as->corank = corank;
10303 if (automatic_flag && sym->attr.save == SAVE_EXPLICIT)
10305 gfc_error (auto_save_msg, sym->name, &sym->declared_at);
10310 /* Ensure that any initializer is simplified. */
10312 gfc_simplify_expr (sym->value, 1);
10314 /* Reject illegal initializers. */
10315 if (!sym->mark && sym->value)
10317 if (sym->attr.allocatable || (sym->ts.type == BT_CLASS
10318 && CLASS_DATA (sym)->attr.allocatable))
10319 gfc_error ("Allocatable '%s' at %L cannot have an initializer",
10320 sym->name, &sym->declared_at);
10321 else if (sym->attr.external)
10322 gfc_error ("External '%s' at %L cannot have an initializer",
10323 sym->name, &sym->declared_at);
10324 else if (sym->attr.dummy
10325 && !(sym->ts.type == BT_DERIVED && sym->attr.intent == INTENT_OUT))
10326 gfc_error ("Dummy '%s' at %L cannot have an initializer",
10327 sym->name, &sym->declared_at);
10328 else if (sym->attr.intrinsic)
10329 gfc_error ("Intrinsic '%s' at %L cannot have an initializer",
10330 sym->name, &sym->declared_at);
10331 else if (sym->attr.result)
10332 gfc_error ("Function result '%s' at %L cannot have an initializer",
10333 sym->name, &sym->declared_at);
10334 else if (automatic_flag)
10335 gfc_error ("Automatic array '%s' at %L cannot have an initializer",
10336 sym->name, &sym->declared_at);
10338 goto no_init_error;
10343 if (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS)
10344 return resolve_fl_variable_derived (sym, no_init_flag);
10350 /* Resolve a procedure. */
10353 resolve_fl_procedure (gfc_symbol *sym, int mp_flag)
10355 gfc_formal_arglist *arg;
10357 if (sym->attr.function
10358 && resolve_fl_var_and_proc (sym, mp_flag) == FAILURE)
10361 if (sym->ts.type == BT_CHARACTER)
10363 gfc_charlen *cl = sym->ts.u.cl;
10365 if (cl && cl->length && gfc_is_constant_expr (cl->length)
10366 && resolve_charlen (cl) == FAILURE)
10369 if ((!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
10370 && sym->attr.proc == PROC_ST_FUNCTION)
10372 gfc_error ("Character-valued statement function '%s' at %L must "
10373 "have constant length", sym->name, &sym->declared_at);
10378 /* Ensure that derived type for are not of a private type. Internal
10379 module procedures are excluded by 2.2.3.3 - i.e., they are not
10380 externally accessible and can access all the objects accessible in
10382 if (!(sym->ns->parent
10383 && sym->ns->parent->proc_name->attr.flavor == FL_MODULE)
10384 && gfc_check_symbol_access (sym))
10386 gfc_interface *iface;
10388 for (arg = sym->formal; arg; arg = arg->next)
10391 && arg->sym->ts.type == BT_DERIVED
10392 && !arg->sym->ts.u.derived->attr.use_assoc
10393 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10394 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: '%s' is of a "
10395 "PRIVATE type and cannot be a dummy argument"
10396 " of '%s', which is PUBLIC at %L",
10397 arg->sym->name, sym->name, &sym->declared_at)
10400 /* Stop this message from recurring. */
10401 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10406 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10407 PRIVATE to the containing module. */
10408 for (iface = sym->generic; iface; iface = iface->next)
10410 for (arg = iface->sym->formal; arg; arg = arg->next)
10413 && arg->sym->ts.type == BT_DERIVED
10414 && !arg->sym->ts.u.derived->attr.use_assoc
10415 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10416 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10417 "'%s' in PUBLIC interface '%s' at %L "
10418 "takes dummy arguments of '%s' which is "
10419 "PRIVATE", iface->sym->name, sym->name,
10420 &iface->sym->declared_at,
10421 gfc_typename (&arg->sym->ts)) == FAILURE)
10423 /* Stop this message from recurring. */
10424 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10430 /* PUBLIC interfaces may expose PRIVATE procedures that take types
10431 PRIVATE to the containing module. */
10432 for (iface = sym->generic; iface; iface = iface->next)
10434 for (arg = iface->sym->formal; arg; arg = arg->next)
10437 && arg->sym->ts.type == BT_DERIVED
10438 && !arg->sym->ts.u.derived->attr.use_assoc
10439 && !gfc_check_symbol_access (arg->sym->ts.u.derived)
10440 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Procedure "
10441 "'%s' in PUBLIC interface '%s' at %L "
10442 "takes dummy arguments of '%s' which is "
10443 "PRIVATE", iface->sym->name, sym->name,
10444 &iface->sym->declared_at,
10445 gfc_typename (&arg->sym->ts)) == FAILURE)
10447 /* Stop this message from recurring. */
10448 arg->sym->ts.u.derived->attr.access = ACCESS_PUBLIC;
10455 if (sym->attr.function && sym->value && sym->attr.proc != PROC_ST_FUNCTION
10456 && !sym->attr.proc_pointer)
10458 gfc_error ("Function '%s' at %L cannot have an initializer",
10459 sym->name, &sym->declared_at);
10463 /* An external symbol may not have an initializer because it is taken to be
10464 a procedure. Exception: Procedure Pointers. */
10465 if (sym->attr.external && sym->value && !sym->attr.proc_pointer)
10467 gfc_error ("External object '%s' at %L may not have an initializer",
10468 sym->name, &sym->declared_at);
10472 /* An elemental function is required to return a scalar 12.7.1 */
10473 if (sym->attr.elemental && sym->attr.function && sym->as)
10475 gfc_error ("ELEMENTAL function '%s' at %L must have a scalar "
10476 "result", sym->name, &sym->declared_at);
10477 /* Reset so that the error only occurs once. */
10478 sym->attr.elemental = 0;
10482 if (sym->attr.proc == PROC_ST_FUNCTION
10483 && (sym->attr.allocatable || sym->attr.pointer))
10485 gfc_error ("Statement function '%s' at %L may not have pointer or "
10486 "allocatable attribute", sym->name, &sym->declared_at);
10490 /* 5.1.1.5 of the Standard: A function name declared with an asterisk
10491 char-len-param shall not be array-valued, pointer-valued, recursive
10492 or pure. ....snip... A character value of * may only be used in the
10493 following ways: (i) Dummy arg of procedure - dummy associates with
10494 actual length; (ii) To declare a named constant; or (iii) External
10495 function - but length must be declared in calling scoping unit. */
10496 if (sym->attr.function
10497 && sym->ts.type == BT_CHARACTER
10498 && sym->ts.u.cl && sym->ts.u.cl->length == NULL)
10500 if ((sym->as && sym->as->rank) || (sym->attr.pointer)
10501 || (sym->attr.recursive) || (sym->attr.pure))
10503 if (sym->as && sym->as->rank)
10504 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10505 "array-valued", sym->name, &sym->declared_at);
10507 if (sym->attr.pointer)
10508 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10509 "pointer-valued", sym->name, &sym->declared_at);
10511 if (sym->attr.pure)
10512 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10513 "pure", sym->name, &sym->declared_at);
10515 if (sym->attr.recursive)
10516 gfc_error ("CHARACTER(*) function '%s' at %L cannot be "
10517 "recursive", sym->name, &sym->declared_at);
10522 /* Appendix B.2 of the standard. Contained functions give an
10523 error anyway. Fixed-form is likely to be F77/legacy. Deferred
10524 character length is an F2003 feature. */
10525 if (!sym->attr.contained
10526 && gfc_current_form != FORM_FIXED
10527 && !sym->ts.deferred)
10528 gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
10529 "CHARACTER(*) function '%s' at %L",
10530 sym->name, &sym->declared_at);
10533 if (sym->attr.is_bind_c && sym->attr.is_c_interop != 1)
10535 gfc_formal_arglist *curr_arg;
10536 int has_non_interop_arg = 0;
10538 if (verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
10539 sym->common_block) == FAILURE)
10541 /* Clear these to prevent looking at them again if there was an
10543 sym->attr.is_bind_c = 0;
10544 sym->attr.is_c_interop = 0;
10545 sym->ts.is_c_interop = 0;
10549 /* So far, no errors have been found. */
10550 sym->attr.is_c_interop = 1;
10551 sym->ts.is_c_interop = 1;
10554 curr_arg = sym->formal;
10555 while (curr_arg != NULL)
10557 /* Skip implicitly typed dummy args here. */
10558 if (curr_arg->sym->attr.implicit_type == 0)
10559 if (gfc_verify_c_interop_param (curr_arg->sym) == FAILURE)
10560 /* If something is found to fail, record the fact so we
10561 can mark the symbol for the procedure as not being
10562 BIND(C) to try and prevent multiple errors being
10564 has_non_interop_arg = 1;
10566 curr_arg = curr_arg->next;
10569 /* See if any of the arguments were not interoperable and if so, clear
10570 the procedure symbol to prevent duplicate error messages. */
10571 if (has_non_interop_arg != 0)
10573 sym->attr.is_c_interop = 0;
10574 sym->ts.is_c_interop = 0;
10575 sym->attr.is_bind_c = 0;
10579 if (!sym->attr.proc_pointer)
10581 if (sym->attr.save == SAVE_EXPLICIT)
10583 gfc_error ("PROCEDURE attribute conflicts with SAVE attribute "
10584 "in '%s' at %L", sym->name, &sym->declared_at);
10587 if (sym->attr.intent)
10589 gfc_error ("PROCEDURE attribute conflicts with INTENT attribute "
10590 "in '%s' at %L", sym->name, &sym->declared_at);
10593 if (sym->attr.subroutine && sym->attr.result)
10595 gfc_error ("PROCEDURE attribute conflicts with RESULT attribute "
10596 "in '%s' at %L", sym->name, &sym->declared_at);
10599 if (sym->attr.external && sym->attr.function
10600 && ((sym->attr.if_source == IFSRC_DECL && !sym->attr.procedure)
10601 || sym->attr.contained))
10603 gfc_error ("EXTERNAL attribute conflicts with FUNCTION attribute "
10604 "in '%s' at %L", sym->name, &sym->declared_at);
10607 if (strcmp ("ppr@", sym->name) == 0)
10609 gfc_error ("Procedure pointer result '%s' at %L "
10610 "is missing the pointer attribute",
10611 sym->ns->proc_name->name, &sym->declared_at);
10620 /* Resolve a list of finalizer procedures. That is, after they have hopefully
10621 been defined and we now know their defined arguments, check that they fulfill
10622 the requirements of the standard for procedures used as finalizers. */
10625 gfc_resolve_finalizers (gfc_symbol* derived)
10627 gfc_finalizer* list;
10628 gfc_finalizer** prev_link; /* For removing wrong entries from the list. */
10629 gfc_try result = SUCCESS;
10630 bool seen_scalar = false;
10632 if (!derived->f2k_derived || !derived->f2k_derived->finalizers)
10635 /* Walk over the list of finalizer-procedures, check them, and if any one
10636 does not fit in with the standard's definition, print an error and remove
10637 it from the list. */
10638 prev_link = &derived->f2k_derived->finalizers;
10639 for (list = derived->f2k_derived->finalizers; list; list = *prev_link)
10645 /* Skip this finalizer if we already resolved it. */
10646 if (list->proc_tree)
10648 prev_link = &(list->next);
10652 /* Check this exists and is a SUBROUTINE. */
10653 if (!list->proc_sym->attr.subroutine)
10655 gfc_error ("FINAL procedure '%s' at %L is not a SUBROUTINE",
10656 list->proc_sym->name, &list->where);
10660 /* We should have exactly one argument. */
10661 if (!list->proc_sym->formal || list->proc_sym->formal->next)
10663 gfc_error ("FINAL procedure at %L must have exactly one argument",
10667 arg = list->proc_sym->formal->sym;
10669 /* This argument must be of our type. */
10670 if (arg->ts.type != BT_DERIVED || arg->ts.u.derived != derived)
10672 gfc_error ("Argument of FINAL procedure at %L must be of type '%s'",
10673 &arg->declared_at, derived->name);
10677 /* It must neither be a pointer nor allocatable nor optional. */
10678 if (arg->attr.pointer)
10680 gfc_error ("Argument of FINAL procedure at %L must not be a POINTER",
10681 &arg->declared_at);
10684 if (arg->attr.allocatable)
10686 gfc_error ("Argument of FINAL procedure at %L must not be"
10687 " ALLOCATABLE", &arg->declared_at);
10690 if (arg->attr.optional)
10692 gfc_error ("Argument of FINAL procedure at %L must not be OPTIONAL",
10693 &arg->declared_at);
10697 /* It must not be INTENT(OUT). */
10698 if (arg->attr.intent == INTENT_OUT)
10700 gfc_error ("Argument of FINAL procedure at %L must not be"
10701 " INTENT(OUT)", &arg->declared_at);
10705 /* Warn if the procedure is non-scalar and not assumed shape. */
10706 if (gfc_option.warn_surprising && arg->as && arg->as->rank > 0
10707 && arg->as->type != AS_ASSUMED_SHAPE)
10708 gfc_warning ("Non-scalar FINAL procedure at %L should have assumed"
10709 " shape argument", &arg->declared_at);
10711 /* Check that it does not match in kind and rank with a FINAL procedure
10712 defined earlier. To really loop over the *earlier* declarations,
10713 we need to walk the tail of the list as new ones were pushed at the
10715 /* TODO: Handle kind parameters once they are implemented. */
10716 my_rank = (arg->as ? arg->as->rank : 0);
10717 for (i = list->next; i; i = i->next)
10719 /* Argument list might be empty; that is an error signalled earlier,
10720 but we nevertheless continued resolving. */
10721 if (i->proc_sym->formal)
10723 gfc_symbol* i_arg = i->proc_sym->formal->sym;
10724 const int i_rank = (i_arg->as ? i_arg->as->rank : 0);
10725 if (i_rank == my_rank)
10727 gfc_error ("FINAL procedure '%s' declared at %L has the same"
10728 " rank (%d) as '%s'",
10729 list->proc_sym->name, &list->where, my_rank,
10730 i->proc_sym->name);
10736 /* Is this the/a scalar finalizer procedure? */
10737 if (!arg->as || arg->as->rank == 0)
10738 seen_scalar = true;
10740 /* Find the symtree for this procedure. */
10741 gcc_assert (!list->proc_tree);
10742 list->proc_tree = gfc_find_sym_in_symtree (list->proc_sym);
10744 prev_link = &list->next;
10747 /* Remove wrong nodes immediately from the list so we don't risk any
10748 troubles in the future when they might fail later expectations. */
10752 *prev_link = list->next;
10753 gfc_free_finalizer (i);
10756 /* Warn if we haven't seen a scalar finalizer procedure (but we know there
10757 were nodes in the list, must have been for arrays. It is surely a good
10758 idea to have a scalar version there if there's something to finalize. */
10759 if (gfc_option.warn_surprising && result == SUCCESS && !seen_scalar)
10760 gfc_warning ("Only array FINAL procedures declared for derived type '%s'"
10761 " defined at %L, suggest also scalar one",
10762 derived->name, &derived->declared_at);
10764 /* TODO: Remove this error when finalization is finished. */
10765 gfc_error ("Finalization at %L is not yet implemented",
10766 &derived->declared_at);
10772 /* Check if two GENERIC targets are ambiguous and emit an error is they are. */
10775 check_generic_tbp_ambiguity (gfc_tbp_generic* t1, gfc_tbp_generic* t2,
10776 const char* generic_name, locus where)
10781 gcc_assert (t1->specific && t2->specific);
10782 gcc_assert (!t1->specific->is_generic);
10783 gcc_assert (!t2->specific->is_generic);
10785 sym1 = t1->specific->u.specific->n.sym;
10786 sym2 = t2->specific->u.specific->n.sym;
10791 /* Both must be SUBROUTINEs or both must be FUNCTIONs. */
10792 if (sym1->attr.subroutine != sym2->attr.subroutine
10793 || sym1->attr.function != sym2->attr.function)
10795 gfc_error ("'%s' and '%s' can't be mixed FUNCTION/SUBROUTINE for"
10796 " GENERIC '%s' at %L",
10797 sym1->name, sym2->name, generic_name, &where);
10801 /* Compare the interfaces. */
10802 if (gfc_compare_interfaces (sym1, sym2, sym2->name, 1, 0, NULL, 0))
10804 gfc_error ("'%s' and '%s' for GENERIC '%s' at %L are ambiguous",
10805 sym1->name, sym2->name, generic_name, &where);
10813 /* Worker function for resolving a generic procedure binding; this is used to
10814 resolve GENERIC as well as user and intrinsic OPERATOR typebound procedures.
10816 The difference between those cases is finding possible inherited bindings
10817 that are overridden, as one has to look for them in tb_sym_root,
10818 tb_uop_root or tb_op, respectively. Thus the caller must already find
10819 the super-type and set p->overridden correctly. */
10822 resolve_tb_generic_targets (gfc_symbol* super_type,
10823 gfc_typebound_proc* p, const char* name)
10825 gfc_tbp_generic* target;
10826 gfc_symtree* first_target;
10827 gfc_symtree* inherited;
10829 gcc_assert (p && p->is_generic);
10831 /* Try to find the specific bindings for the symtrees in our target-list. */
10832 gcc_assert (p->u.generic);
10833 for (target = p->u.generic; target; target = target->next)
10834 if (!target->specific)
10836 gfc_typebound_proc* overridden_tbp;
10837 gfc_tbp_generic* g;
10838 const char* target_name;
10840 target_name = target->specific_st->name;
10842 /* Defined for this type directly. */
10843 if (target->specific_st->n.tb && !target->specific_st->n.tb->error)
10845 target->specific = target->specific_st->n.tb;
10846 goto specific_found;
10849 /* Look for an inherited specific binding. */
10852 inherited = gfc_find_typebound_proc (super_type, NULL, target_name,
10857 gcc_assert (inherited->n.tb);
10858 target->specific = inherited->n.tb;
10859 goto specific_found;
10863 gfc_error ("Undefined specific binding '%s' as target of GENERIC '%s'"
10864 " at %L", target_name, name, &p->where);
10867 /* Once we've found the specific binding, check it is not ambiguous with
10868 other specifics already found or inherited for the same GENERIC. */
10870 gcc_assert (target->specific);
10872 /* This must really be a specific binding! */
10873 if (target->specific->is_generic)
10875 gfc_error ("GENERIC '%s' at %L must target a specific binding,"
10876 " '%s' is GENERIC, too", name, &p->where, target_name);
10880 /* Check those already resolved on this type directly. */
10881 for (g = p->u.generic; g; g = g->next)
10882 if (g != target && g->specific
10883 && check_generic_tbp_ambiguity (target, g, name, p->where)
10887 /* Check for ambiguity with inherited specific targets. */
10888 for (overridden_tbp = p->overridden; overridden_tbp;
10889 overridden_tbp = overridden_tbp->overridden)
10890 if (overridden_tbp->is_generic)
10892 for (g = overridden_tbp->u.generic; g; g = g->next)
10894 gcc_assert (g->specific);
10895 if (check_generic_tbp_ambiguity (target, g,
10896 name, p->where) == FAILURE)
10902 /* If we attempt to "overwrite" a specific binding, this is an error. */
10903 if (p->overridden && !p->overridden->is_generic)
10905 gfc_error ("GENERIC '%s' at %L can't overwrite specific binding with"
10906 " the same name", name, &p->where);
10910 /* Take the SUBROUTINE/FUNCTION attributes of the first specific target, as
10911 all must have the same attributes here. */
10912 first_target = p->u.generic->specific->u.specific;
10913 gcc_assert (first_target);
10914 p->subroutine = first_target->n.sym->attr.subroutine;
10915 p->function = first_target->n.sym->attr.function;
10921 /* Resolve a GENERIC procedure binding for a derived type. */
10924 resolve_typebound_generic (gfc_symbol* derived, gfc_symtree* st)
10926 gfc_symbol* super_type;
10928 /* Find the overridden binding if any. */
10929 st->n.tb->overridden = NULL;
10930 super_type = gfc_get_derived_super_type (derived);
10933 gfc_symtree* overridden;
10934 overridden = gfc_find_typebound_proc (super_type, NULL, st->name,
10937 if (overridden && overridden->n.tb)
10938 st->n.tb->overridden = overridden->n.tb;
10941 /* Resolve using worker function. */
10942 return resolve_tb_generic_targets (super_type, st->n.tb, st->name);
10946 /* Retrieve the target-procedure of an operator binding and do some checks in
10947 common for intrinsic and user-defined type-bound operators. */
10950 get_checked_tb_operator_target (gfc_tbp_generic* target, locus where)
10952 gfc_symbol* target_proc;
10954 gcc_assert (target->specific && !target->specific->is_generic);
10955 target_proc = target->specific->u.specific->n.sym;
10956 gcc_assert (target_proc);
10958 /* All operator bindings must have a passed-object dummy argument. */
10959 if (target->specific->nopass)
10961 gfc_error ("Type-bound operator at %L can't be NOPASS", &where);
10965 return target_proc;
10969 /* Resolve a type-bound intrinsic operator. */
10972 resolve_typebound_intrinsic_op (gfc_symbol* derived, gfc_intrinsic_op op,
10973 gfc_typebound_proc* p)
10975 gfc_symbol* super_type;
10976 gfc_tbp_generic* target;
10978 /* If there's already an error here, do nothing (but don't fail again). */
10982 /* Operators should always be GENERIC bindings. */
10983 gcc_assert (p->is_generic);
10985 /* Look for an overridden binding. */
10986 super_type = gfc_get_derived_super_type (derived);
10987 if (super_type && super_type->f2k_derived)
10988 p->overridden = gfc_find_typebound_intrinsic_op (super_type, NULL,
10991 p->overridden = NULL;
10993 /* Resolve general GENERIC properties using worker function. */
10994 if (resolve_tb_generic_targets (super_type, p, gfc_op2string (op)) == FAILURE)
10997 /* Check the targets to be procedures of correct interface. */
10998 for (target = p->u.generic; target; target = target->next)
11000 gfc_symbol* target_proc;
11002 target_proc = get_checked_tb_operator_target (target, p->where);
11006 if (!gfc_check_operator_interface (target_proc, op, p->where))
11018 /* Resolve a type-bound user operator (tree-walker callback). */
11020 static gfc_symbol* resolve_bindings_derived;
11021 static gfc_try resolve_bindings_result;
11023 static gfc_try check_uop_procedure (gfc_symbol* sym, locus where);
11026 resolve_typebound_user_op (gfc_symtree* stree)
11028 gfc_symbol* super_type;
11029 gfc_tbp_generic* target;
11031 gcc_assert (stree && stree->n.tb);
11033 if (stree->n.tb->error)
11036 /* Operators should always be GENERIC bindings. */
11037 gcc_assert (stree->n.tb->is_generic);
11039 /* Find overridden procedure, if any. */
11040 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11041 if (super_type && super_type->f2k_derived)
11043 gfc_symtree* overridden;
11044 overridden = gfc_find_typebound_user_op (super_type, NULL,
11045 stree->name, true, NULL);
11047 if (overridden && overridden->n.tb)
11048 stree->n.tb->overridden = overridden->n.tb;
11051 stree->n.tb->overridden = NULL;
11053 /* Resolve basically using worker function. */
11054 if (resolve_tb_generic_targets (super_type, stree->n.tb, stree->name)
11058 /* Check the targets to be functions of correct interface. */
11059 for (target = stree->n.tb->u.generic; target; target = target->next)
11061 gfc_symbol* target_proc;
11063 target_proc = get_checked_tb_operator_target (target, stree->n.tb->where);
11067 if (check_uop_procedure (target_proc, stree->n.tb->where) == FAILURE)
11074 resolve_bindings_result = FAILURE;
11075 stree->n.tb->error = 1;
11079 /* Resolve the type-bound procedures for a derived type. */
11082 resolve_typebound_procedure (gfc_symtree* stree)
11086 gfc_symbol* me_arg;
11087 gfc_symbol* super_type;
11088 gfc_component* comp;
11090 gcc_assert (stree);
11092 /* Undefined specific symbol from GENERIC target definition. */
11096 if (stree->n.tb->error)
11099 /* If this is a GENERIC binding, use that routine. */
11100 if (stree->n.tb->is_generic)
11102 if (resolve_typebound_generic (resolve_bindings_derived, stree)
11108 /* Get the target-procedure to check it. */
11109 gcc_assert (!stree->n.tb->is_generic);
11110 gcc_assert (stree->n.tb->u.specific);
11111 proc = stree->n.tb->u.specific->n.sym;
11112 where = stree->n.tb->where;
11114 /* Default access should already be resolved from the parser. */
11115 gcc_assert (stree->n.tb->access != ACCESS_UNKNOWN);
11117 /* It should be a module procedure or an external procedure with explicit
11118 interface. For DEFERRED bindings, abstract interfaces are ok as well. */
11119 if ((!proc->attr.subroutine && !proc->attr.function)
11120 || (proc->attr.proc != PROC_MODULE
11121 && proc->attr.if_source != IFSRC_IFBODY)
11122 || (proc->attr.abstract && !stree->n.tb->deferred))
11124 gfc_error ("'%s' must be a module procedure or an external procedure with"
11125 " an explicit interface at %L", proc->name, &where);
11128 stree->n.tb->subroutine = proc->attr.subroutine;
11129 stree->n.tb->function = proc->attr.function;
11131 /* Find the super-type of the current derived type. We could do this once and
11132 store in a global if speed is needed, but as long as not I believe this is
11133 more readable and clearer. */
11134 super_type = gfc_get_derived_super_type (resolve_bindings_derived);
11136 /* If PASS, resolve and check arguments if not already resolved / loaded
11137 from a .mod file. */
11138 if (!stree->n.tb->nopass && stree->n.tb->pass_arg_num == 0)
11140 if (stree->n.tb->pass_arg)
11142 gfc_formal_arglist* i;
11144 /* If an explicit passing argument name is given, walk the arg-list
11145 and look for it. */
11148 stree->n.tb->pass_arg_num = 1;
11149 for (i = proc->formal; i; i = i->next)
11151 if (!strcmp (i->sym->name, stree->n.tb->pass_arg))
11156 ++stree->n.tb->pass_arg_num;
11161 gfc_error ("Procedure '%s' with PASS(%s) at %L has no"
11163 proc->name, stree->n.tb->pass_arg, &where,
11164 stree->n.tb->pass_arg);
11170 /* Otherwise, take the first one; there should in fact be at least
11172 stree->n.tb->pass_arg_num = 1;
11175 gfc_error ("Procedure '%s' with PASS at %L must have at"
11176 " least one argument", proc->name, &where);
11179 me_arg = proc->formal->sym;
11182 /* Now check that the argument-type matches and the passed-object
11183 dummy argument is generally fine. */
11185 gcc_assert (me_arg);
11187 if (me_arg->ts.type != BT_CLASS)
11189 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11190 " at %L", proc->name, &where);
11194 if (CLASS_DATA (me_arg)->ts.u.derived
11195 != resolve_bindings_derived)
11197 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11198 " the derived-type '%s'", me_arg->name, proc->name,
11199 me_arg->name, &where, resolve_bindings_derived->name);
11203 gcc_assert (me_arg->ts.type == BT_CLASS);
11204 if (CLASS_DATA (me_arg)->as && CLASS_DATA (me_arg)->as->rank > 0)
11206 gfc_error ("Passed-object dummy argument of '%s' at %L must be"
11207 " scalar", proc->name, &where);
11210 if (CLASS_DATA (me_arg)->attr.allocatable)
11212 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11213 " be ALLOCATABLE", proc->name, &where);
11216 if (CLASS_DATA (me_arg)->attr.class_pointer)
11218 gfc_error ("Passed-object dummy argument of '%s' at %L must not"
11219 " be POINTER", proc->name, &where);
11224 /* If we are extending some type, check that we don't override a procedure
11225 flagged NON_OVERRIDABLE. */
11226 stree->n.tb->overridden = NULL;
11229 gfc_symtree* overridden;
11230 overridden = gfc_find_typebound_proc (super_type, NULL,
11231 stree->name, true, NULL);
11235 if (overridden->n.tb)
11236 stree->n.tb->overridden = overridden->n.tb;
11238 if (gfc_check_typebound_override (stree, overridden) == FAILURE)
11243 /* See if there's a name collision with a component directly in this type. */
11244 for (comp = resolve_bindings_derived->components; comp; comp = comp->next)
11245 if (!strcmp (comp->name, stree->name))
11247 gfc_error ("Procedure '%s' at %L has the same name as a component of"
11249 stree->name, &where, resolve_bindings_derived->name);
11253 /* Try to find a name collision with an inherited component. */
11254 if (super_type && gfc_find_component (super_type, stree->name, true, true))
11256 gfc_error ("Procedure '%s' at %L has the same name as an inherited"
11257 " component of '%s'",
11258 stree->name, &where, resolve_bindings_derived->name);
11262 stree->n.tb->error = 0;
11266 resolve_bindings_result = FAILURE;
11267 stree->n.tb->error = 1;
11272 resolve_typebound_procedures (gfc_symbol* derived)
11275 gfc_symbol* super_type;
11277 if (!derived->f2k_derived || !derived->f2k_derived->tb_sym_root)
11280 super_type = gfc_get_derived_super_type (derived);
11282 resolve_typebound_procedures (super_type);
11284 resolve_bindings_derived = derived;
11285 resolve_bindings_result = SUCCESS;
11287 /* Make sure the vtab has been generated. */
11288 gfc_find_derived_vtab (derived);
11290 if (derived->f2k_derived->tb_sym_root)
11291 gfc_traverse_symtree (derived->f2k_derived->tb_sym_root,
11292 &resolve_typebound_procedure);
11294 if (derived->f2k_derived->tb_uop_root)
11295 gfc_traverse_symtree (derived->f2k_derived->tb_uop_root,
11296 &resolve_typebound_user_op);
11298 for (op = 0; op != GFC_INTRINSIC_OPS; ++op)
11300 gfc_typebound_proc* p = derived->f2k_derived->tb_op[op];
11301 if (p && resolve_typebound_intrinsic_op (derived, (gfc_intrinsic_op) op,
11303 resolve_bindings_result = FAILURE;
11306 return resolve_bindings_result;
11310 /* Add a derived type to the dt_list. The dt_list is used in trans-types.c
11311 to give all identical derived types the same backend_decl. */
11313 add_dt_to_dt_list (gfc_symbol *derived)
11315 gfc_dt_list *dt_list;
11317 for (dt_list = gfc_derived_types; dt_list; dt_list = dt_list->next)
11318 if (derived == dt_list->derived)
11321 dt_list = gfc_get_dt_list ();
11322 dt_list->next = gfc_derived_types;
11323 dt_list->derived = derived;
11324 gfc_derived_types = dt_list;
11328 /* Ensure that a derived-type is really not abstract, meaning that every
11329 inherited DEFERRED binding is overridden by a non-DEFERRED one. */
11332 ensure_not_abstract_walker (gfc_symbol* sub, gfc_symtree* st)
11337 if (ensure_not_abstract_walker (sub, st->left) == FAILURE)
11339 if (ensure_not_abstract_walker (sub, st->right) == FAILURE)
11342 if (st->n.tb && st->n.tb->deferred)
11344 gfc_symtree* overriding;
11345 overriding = gfc_find_typebound_proc (sub, NULL, st->name, true, NULL);
11348 gcc_assert (overriding->n.tb);
11349 if (overriding->n.tb->deferred)
11351 gfc_error ("Derived-type '%s' declared at %L must be ABSTRACT because"
11352 " '%s' is DEFERRED and not overridden",
11353 sub->name, &sub->declared_at, st->name);
11362 ensure_not_abstract (gfc_symbol* sub, gfc_symbol* ancestor)
11364 /* The algorithm used here is to recursively travel up the ancestry of sub
11365 and for each ancestor-type, check all bindings. If any of them is
11366 DEFERRED, look it up starting from sub and see if the found (overriding)
11367 binding is not DEFERRED.
11368 This is not the most efficient way to do this, but it should be ok and is
11369 clearer than something sophisticated. */
11371 gcc_assert (ancestor && !sub->attr.abstract);
11373 if (!ancestor->attr.abstract)
11376 /* Walk bindings of this ancestor. */
11377 if (ancestor->f2k_derived)
11380 t = ensure_not_abstract_walker (sub, ancestor->f2k_derived->tb_sym_root);
11385 /* Find next ancestor type and recurse on it. */
11386 ancestor = gfc_get_derived_super_type (ancestor);
11388 return ensure_not_abstract (sub, ancestor);
11394 /* Resolve the components of a derived type. This does not have to wait until
11395 resolution stage, but can be done as soon as the dt declaration has been
11399 resolve_fl_derived0 (gfc_symbol *sym)
11401 gfc_symbol* super_type;
11404 super_type = gfc_get_derived_super_type (sym);
11407 if (super_type && sym->attr.coarray_comp && !super_type->attr.coarray_comp)
11409 gfc_error ("As extending type '%s' at %L has a coarray component, "
11410 "parent type '%s' shall also have one", sym->name,
11411 &sym->declared_at, super_type->name);
11415 /* Ensure the extended type gets resolved before we do. */
11416 if (super_type && resolve_fl_derived0 (super_type) == FAILURE)
11419 /* An ABSTRACT type must be extensible. */
11420 if (sym->attr.abstract && !gfc_type_is_extensible (sym))
11422 gfc_error ("Non-extensible derived-type '%s' at %L must not be ABSTRACT",
11423 sym->name, &sym->declared_at);
11427 for (c = sym->components; c != NULL; c = c->next)
11430 if (c->attr.codimension /* FIXME: c->as check due to PR 43412. */
11431 && (!c->attr.allocatable || (c->as && c->as->type != AS_DEFERRED)))
11433 gfc_error ("Coarray component '%s' at %L must be allocatable with "
11434 "deferred shape", c->name, &c->loc);
11439 if (c->attr.codimension && c->ts.type == BT_DERIVED
11440 && c->ts.u.derived->ts.is_iso_c)
11442 gfc_error ("Component '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
11443 "shall not be a coarray", c->name, &c->loc);
11448 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
11449 && (c->attr.codimension || c->attr.pointer || c->attr.dimension
11450 || c->attr.allocatable))
11452 gfc_error ("Component '%s' at %L with coarray component "
11453 "shall be a nonpointer, nonallocatable scalar",
11459 if (c->attr.contiguous && (!c->attr.dimension || !c->attr.pointer))
11461 gfc_error ("Component '%s' at %L has the CONTIGUOUS attribute but "
11462 "is not an array pointer", c->name, &c->loc);
11466 if (c->attr.proc_pointer && c->ts.interface)
11468 if (c->ts.interface->attr.procedure && !sym->attr.vtype)
11469 gfc_error ("Interface '%s', used by procedure pointer component "
11470 "'%s' at %L, is declared in a later PROCEDURE statement",
11471 c->ts.interface->name, c->name, &c->loc);
11473 /* Get the attributes from the interface (now resolved). */
11474 if (c->ts.interface->attr.if_source
11475 || c->ts.interface->attr.intrinsic)
11477 gfc_symbol *ifc = c->ts.interface;
11479 if (ifc->formal && !ifc->formal_ns)
11480 resolve_symbol (ifc);
11482 if (ifc->attr.intrinsic)
11483 resolve_intrinsic (ifc, &ifc->declared_at);
11487 c->ts = ifc->result->ts;
11488 c->attr.allocatable = ifc->result->attr.allocatable;
11489 c->attr.pointer = ifc->result->attr.pointer;
11490 c->attr.dimension = ifc->result->attr.dimension;
11491 c->as = gfc_copy_array_spec (ifc->result->as);
11496 c->attr.allocatable = ifc->attr.allocatable;
11497 c->attr.pointer = ifc->attr.pointer;
11498 c->attr.dimension = ifc->attr.dimension;
11499 c->as = gfc_copy_array_spec (ifc->as);
11501 c->ts.interface = ifc;
11502 c->attr.function = ifc->attr.function;
11503 c->attr.subroutine = ifc->attr.subroutine;
11504 gfc_copy_formal_args_ppc (c, ifc);
11506 c->attr.pure = ifc->attr.pure;
11507 c->attr.elemental = ifc->attr.elemental;
11508 c->attr.recursive = ifc->attr.recursive;
11509 c->attr.always_explicit = ifc->attr.always_explicit;
11510 c->attr.ext_attr |= ifc->attr.ext_attr;
11511 /* Replace symbols in array spec. */
11515 for (i = 0; i < c->as->rank; i++)
11517 gfc_expr_replace_comp (c->as->lower[i], c);
11518 gfc_expr_replace_comp (c->as->upper[i], c);
11521 /* Copy char length. */
11522 if (ifc->ts.type == BT_CHARACTER && ifc->ts.u.cl)
11524 gfc_charlen *cl = gfc_new_charlen (sym->ns, ifc->ts.u.cl);
11525 gfc_expr_replace_comp (cl->length, c);
11526 if (cl->length && !cl->resolved
11527 && gfc_resolve_expr (cl->length) == FAILURE)
11532 else if (!sym->attr.vtype && c->ts.interface->name[0] != '\0')
11534 gfc_error ("Interface '%s' of procedure pointer component "
11535 "'%s' at %L must be explicit", c->ts.interface->name,
11540 else if (c->attr.proc_pointer && c->ts.type == BT_UNKNOWN)
11542 /* Since PPCs are not implicitly typed, a PPC without an explicit
11543 interface must be a subroutine. */
11544 gfc_add_subroutine (&c->attr, c->name, &c->loc);
11547 /* Procedure pointer components: Check PASS arg. */
11548 if (c->attr.proc_pointer && !c->tb->nopass && c->tb->pass_arg_num == 0
11549 && !sym->attr.vtype)
11551 gfc_symbol* me_arg;
11553 if (c->tb->pass_arg)
11555 gfc_formal_arglist* i;
11557 /* If an explicit passing argument name is given, walk the arg-list
11558 and look for it. */
11561 c->tb->pass_arg_num = 1;
11562 for (i = c->formal; i; i = i->next)
11564 if (!strcmp (i->sym->name, c->tb->pass_arg))
11569 c->tb->pass_arg_num++;
11574 gfc_error ("Procedure pointer component '%s' with PASS(%s) "
11575 "at %L has no argument '%s'", c->name,
11576 c->tb->pass_arg, &c->loc, c->tb->pass_arg);
11583 /* Otherwise, take the first one; there should in fact be at least
11585 c->tb->pass_arg_num = 1;
11588 gfc_error ("Procedure pointer component '%s' with PASS at %L "
11589 "must have at least one argument",
11594 me_arg = c->formal->sym;
11597 /* Now check that the argument-type matches. */
11598 gcc_assert (me_arg);
11599 if ((me_arg->ts.type != BT_DERIVED && me_arg->ts.type != BT_CLASS)
11600 || (me_arg->ts.type == BT_DERIVED && me_arg->ts.u.derived != sym)
11601 || (me_arg->ts.type == BT_CLASS
11602 && CLASS_DATA (me_arg)->ts.u.derived != sym))
11604 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L must be of"
11605 " the derived type '%s'", me_arg->name, c->name,
11606 me_arg->name, &c->loc, sym->name);
11611 /* Check for C453. */
11612 if (me_arg->attr.dimension)
11614 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11615 "must be scalar", me_arg->name, c->name, me_arg->name,
11621 if (me_arg->attr.pointer)
11623 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11624 "may not have the POINTER attribute", me_arg->name,
11625 c->name, me_arg->name, &c->loc);
11630 if (me_arg->attr.allocatable)
11632 gfc_error ("Argument '%s' of '%s' with PASS(%s) at %L "
11633 "may not be ALLOCATABLE", me_arg->name, c->name,
11634 me_arg->name, &c->loc);
11639 if (gfc_type_is_extensible (sym) && me_arg->ts.type != BT_CLASS)
11640 gfc_error ("Non-polymorphic passed-object dummy argument of '%s'"
11641 " at %L", c->name, &c->loc);
11645 /* Check type-spec if this is not the parent-type component. */
11646 if ((!sym->attr.extension || c != sym->components) && !sym->attr.vtype
11647 && resolve_typespec_used (&c->ts, &c->loc, c->name) == FAILURE)
11650 /* If this type is an extension, set the accessibility of the parent
11652 if (super_type && c == sym->components
11653 && strcmp (super_type->name, c->name) == 0)
11654 c->attr.access = super_type->attr.access;
11656 /* If this type is an extension, see if this component has the same name
11657 as an inherited type-bound procedure. */
11658 if (super_type && !sym->attr.is_class
11659 && gfc_find_typebound_proc (super_type, NULL, c->name, true, NULL))
11661 gfc_error ("Component '%s' of '%s' at %L has the same name as an"
11662 " inherited type-bound procedure",
11663 c->name, sym->name, &c->loc);
11667 if (c->ts.type == BT_CHARACTER && !c->attr.proc_pointer
11668 && !c->ts.deferred)
11670 if (c->ts.u.cl->length == NULL
11671 || (resolve_charlen (c->ts.u.cl) == FAILURE)
11672 || !gfc_is_constant_expr (c->ts.u.cl->length))
11674 gfc_error ("Character length of component '%s' needs to "
11675 "be a constant specification expression at %L",
11677 c->ts.u.cl->length ? &c->ts.u.cl->length->where : &c->loc);
11682 if (c->ts.type == BT_CHARACTER && c->ts.deferred
11683 && !c->attr.pointer && !c->attr.allocatable)
11685 gfc_error ("Character component '%s' of '%s' at %L with deferred "
11686 "length must be a POINTER or ALLOCATABLE",
11687 c->name, sym->name, &c->loc);
11691 if (c->ts.type == BT_DERIVED
11692 && sym->component_access != ACCESS_PRIVATE
11693 && gfc_check_symbol_access (sym)
11694 && !is_sym_host_assoc (c->ts.u.derived, sym->ns)
11695 && !c->ts.u.derived->attr.use_assoc
11696 && !gfc_check_symbol_access (c->ts.u.derived)
11697 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: the component '%s' "
11698 "is a PRIVATE type and cannot be a component of "
11699 "'%s', which is PUBLIC at %L", c->name,
11700 sym->name, &sym->declared_at) == FAILURE)
11703 if ((sym->attr.sequence || sym->attr.is_bind_c) && c->ts.type == BT_CLASS)
11705 gfc_error ("Polymorphic component %s at %L in SEQUENCE or BIND(C) "
11706 "type %s", c->name, &c->loc, sym->name);
11710 if (sym->attr.sequence)
11712 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.sequence == 0)
11714 gfc_error ("Component %s of SEQUENCE type declared at %L does "
11715 "not have the SEQUENCE attribute",
11716 c->ts.u.derived->name, &sym->declared_at);
11721 if (!sym->attr.is_class && c->ts.type == BT_DERIVED && !sym->attr.vtype
11722 && c->attr.pointer && c->ts.u.derived->components == NULL
11723 && !c->ts.u.derived->attr.zero_comp)
11725 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11726 "that has not been declared", c->name, sym->name,
11731 if (c->ts.type == BT_CLASS && c->attr.class_ok
11732 && CLASS_DATA (c)->attr.class_pointer
11733 && CLASS_DATA (c)->ts.u.derived->components == NULL
11734 && !CLASS_DATA (c)->ts.u.derived->attr.zero_comp)
11736 gfc_error ("The pointer component '%s' of '%s' at %L is a type "
11737 "that has not been declared", c->name, sym->name,
11743 if (c->ts.type == BT_CLASS && c->attr.flavor != FL_PROCEDURE
11744 && (!c->attr.class_ok
11745 || !(CLASS_DATA (c)->attr.class_pointer
11746 || CLASS_DATA (c)->attr.allocatable)))
11748 gfc_error ("Component '%s' with CLASS at %L must be allocatable "
11749 "or pointer", c->name, &c->loc);
11753 /* Ensure that all the derived type components are put on the
11754 derived type list; even in formal namespaces, where derived type
11755 pointer components might not have been declared. */
11756 if (c->ts.type == BT_DERIVED
11758 && c->ts.u.derived->components
11760 && sym != c->ts.u.derived)
11761 add_dt_to_dt_list (c->ts.u.derived);
11763 if (gfc_resolve_array_spec (c->as, !(c->attr.pointer
11764 || c->attr.proc_pointer
11765 || c->attr.allocatable)) == FAILURE)
11769 /* If this is a non-ABSTRACT type extending an ABSTRACT one, ensure that
11770 all DEFERRED bindings are overridden. */
11771 if (super_type && super_type->attr.abstract && !sym->attr.abstract
11772 && !sym->attr.is_class
11773 && ensure_not_abstract (sym, super_type) == FAILURE)
11776 /* Add derived type to the derived type list. */
11777 add_dt_to_dt_list (sym);
11783 /* The following procedure does the full resolution of a derived type,
11784 including resolution of all type-bound procedures (if present). In contrast
11785 to 'resolve_fl_derived0' this can only be done after the module has been
11786 parsed completely. */
11789 resolve_fl_derived (gfc_symbol *sym)
11791 if (sym->attr.is_class && sym->ts.u.derived == NULL)
11793 /* Fix up incomplete CLASS symbols. */
11794 gfc_component *data = gfc_find_component (sym, "_data", true, true);
11795 gfc_component *vptr = gfc_find_component (sym, "_vptr", true, true);
11796 if (vptr->ts.u.derived == NULL)
11798 gfc_symbol *vtab = gfc_find_derived_vtab (data->ts.u.derived);
11800 vptr->ts.u.derived = vtab->ts.u.derived;
11804 if (resolve_fl_derived0 (sym) == FAILURE)
11807 /* Resolve the type-bound procedures. */
11808 if (resolve_typebound_procedures (sym) == FAILURE)
11811 /* Resolve the finalizer procedures. */
11812 if (gfc_resolve_finalizers (sym) == FAILURE)
11820 resolve_fl_namelist (gfc_symbol *sym)
11825 for (nl = sym->namelist; nl; nl = nl->next)
11827 /* Check again, the check in match only works if NAMELIST comes
11829 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SIZE)
11831 gfc_error ("Assumed size array '%s' in namelist '%s' at %L is not "
11832 "allowed", nl->sym->name, sym->name, &sym->declared_at);
11836 if (nl->sym->as && nl->sym->as->type == AS_ASSUMED_SHAPE
11837 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11838 "object '%s' with assumed shape in namelist "
11839 "'%s' at %L", nl->sym->name, sym->name,
11840 &sym->declared_at) == FAILURE)
11843 if (is_non_constant_shape_array (nl->sym)
11844 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST array "
11845 "object '%s' with nonconstant shape in namelist "
11846 "'%s' at %L", nl->sym->name, sym->name,
11847 &sym->declared_at) == FAILURE)
11850 if (nl->sym->ts.type == BT_CHARACTER
11851 && (nl->sym->ts.u.cl->length == NULL
11852 || !gfc_is_constant_expr (nl->sym->ts.u.cl->length))
11853 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11854 "'%s' with nonconstant character length in "
11855 "namelist '%s' at %L", nl->sym->name, sym->name,
11856 &sym->declared_at) == FAILURE)
11859 /* FIXME: Once UDDTIO is implemented, the following can be
11861 if (nl->sym->ts.type == BT_CLASS)
11863 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L is "
11864 "polymorphic and requires a defined input/output "
11865 "procedure", nl->sym->name, sym->name, &sym->declared_at);
11869 if (nl->sym->ts.type == BT_DERIVED
11870 && (nl->sym->ts.u.derived->attr.alloc_comp
11871 || nl->sym->ts.u.derived->attr.pointer_comp))
11873 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: NAMELIST object "
11874 "'%s' in namelist '%s' at %L with ALLOCATABLE "
11875 "or POINTER components", nl->sym->name,
11876 sym->name, &sym->declared_at) == FAILURE)
11879 /* FIXME: Once UDDTIO is implemented, the following can be
11881 gfc_error ("NAMELIST object '%s' in namelist '%s' at %L has "
11882 "ALLOCATABLE or POINTER components and thus requires "
11883 "a defined input/output procedure", nl->sym->name,
11884 sym->name, &sym->declared_at);
11889 /* Reject PRIVATE objects in a PUBLIC namelist. */
11890 if (gfc_check_symbol_access (sym))
11892 for (nl = sym->namelist; nl; nl = nl->next)
11894 if (!nl->sym->attr.use_assoc
11895 && !is_sym_host_assoc (nl->sym, sym->ns)
11896 && !gfc_check_symbol_access (nl->sym))
11898 gfc_error ("NAMELIST object '%s' was declared PRIVATE and "
11899 "cannot be member of PUBLIC namelist '%s' at %L",
11900 nl->sym->name, sym->name, &sym->declared_at);
11904 /* Types with private components that came here by USE-association. */
11905 if (nl->sym->ts.type == BT_DERIVED
11906 && derived_inaccessible (nl->sym->ts.u.derived))
11908 gfc_error ("NAMELIST object '%s' has use-associated PRIVATE "
11909 "components and cannot be member of namelist '%s' at %L",
11910 nl->sym->name, sym->name, &sym->declared_at);
11914 /* Types with private components that are defined in the same module. */
11915 if (nl->sym->ts.type == BT_DERIVED
11916 && !is_sym_host_assoc (nl->sym->ts.u.derived, sym->ns)
11917 && nl->sym->ts.u.derived->attr.private_comp)
11919 gfc_error ("NAMELIST object '%s' has PRIVATE components and "
11920 "cannot be a member of PUBLIC namelist '%s' at %L",
11921 nl->sym->name, sym->name, &sym->declared_at);
11928 /* 14.1.2 A module or internal procedure represent local entities
11929 of the same type as a namelist member and so are not allowed. */
11930 for (nl = sym->namelist; nl; nl = nl->next)
11932 if (nl->sym->ts.kind != 0 && nl->sym->attr.flavor == FL_VARIABLE)
11935 if (nl->sym->attr.function && nl->sym == nl->sym->result)
11936 if ((nl->sym == sym->ns->proc_name)
11938 (sym->ns->parent && nl->sym == sym->ns->parent->proc_name))
11942 if (nl->sym && nl->sym->name)
11943 gfc_find_symbol (nl->sym->name, sym->ns, 1, &nlsym);
11944 if (nlsym && nlsym->attr.flavor == FL_PROCEDURE)
11946 gfc_error ("PROCEDURE attribute conflicts with NAMELIST "
11947 "attribute in '%s' at %L", nlsym->name,
11948 &sym->declared_at);
11958 resolve_fl_parameter (gfc_symbol *sym)
11960 /* A parameter array's shape needs to be constant. */
11961 if (sym->as != NULL
11962 && (sym->as->type == AS_DEFERRED
11963 || is_non_constant_shape_array (sym)))
11965 gfc_error ("Parameter array '%s' at %L cannot be automatic "
11966 "or of deferred shape", sym->name, &sym->declared_at);
11970 /* Make sure a parameter that has been implicitly typed still
11971 matches the implicit type, since PARAMETER statements can precede
11972 IMPLICIT statements. */
11973 if (sym->attr.implicit_type
11974 && !gfc_compare_types (&sym->ts, gfc_get_default_type (sym->name,
11977 gfc_error ("Implicitly typed PARAMETER '%s' at %L doesn't match a "
11978 "later IMPLICIT type", sym->name, &sym->declared_at);
11982 /* Make sure the types of derived parameters are consistent. This
11983 type checking is deferred until resolution because the type may
11984 refer to a derived type from the host. */
11985 if (sym->ts.type == BT_DERIVED
11986 && !gfc_compare_types (&sym->ts, &sym->value->ts))
11988 gfc_error ("Incompatible derived type in PARAMETER at %L",
11989 &sym->value->where);
11996 /* Do anything necessary to resolve a symbol. Right now, we just
11997 assume that an otherwise unknown symbol is a variable. This sort
11998 of thing commonly happens for symbols in module. */
12001 resolve_symbol (gfc_symbol *sym)
12003 int check_constant, mp_flag;
12004 gfc_symtree *symtree;
12005 gfc_symtree *this_symtree;
12009 if (sym->attr.flavor == FL_UNKNOWN)
12012 /* If we find that a flavorless symbol is an interface in one of the
12013 parent namespaces, find its symtree in this namespace, free the
12014 symbol and set the symtree to point to the interface symbol. */
12015 for (ns = gfc_current_ns->parent; ns; ns = ns->parent)
12017 symtree = gfc_find_symtree (ns->sym_root, sym->name);
12018 if (symtree && (symtree->n.sym->generic ||
12019 (symtree->n.sym->attr.flavor == FL_PROCEDURE
12020 && sym->ns->construct_entities)))
12022 this_symtree = gfc_find_symtree (gfc_current_ns->sym_root,
12024 gfc_release_symbol (sym);
12025 symtree->n.sym->refs++;
12026 this_symtree->n.sym = symtree->n.sym;
12031 /* Otherwise give it a flavor according to such attributes as
12033 if (sym->attr.external == 0 && sym->attr.intrinsic == 0)
12034 sym->attr.flavor = FL_VARIABLE;
12037 sym->attr.flavor = FL_PROCEDURE;
12038 if (sym->attr.dimension)
12039 sym->attr.function = 1;
12043 if (sym->attr.external && sym->ts.type != BT_UNKNOWN && !sym->attr.function)
12044 gfc_add_function (&sym->attr, sym->name, &sym->declared_at);
12046 if (sym->attr.procedure && sym->ts.interface
12047 && sym->attr.if_source != IFSRC_DECL
12048 && resolve_procedure_interface (sym) == FAILURE)
12051 if (sym->attr.is_protected && !sym->attr.proc_pointer
12052 && (sym->attr.procedure || sym->attr.external))
12054 if (sym->attr.external)
12055 gfc_error ("PROTECTED attribute conflicts with EXTERNAL attribute "
12056 "at %L", &sym->declared_at);
12058 gfc_error ("PROCEDURE attribute conflicts with PROTECTED attribute "
12059 "at %L", &sym->declared_at);
12066 if (sym->attr.contiguous
12067 && (!sym->attr.dimension || (sym->as->type != AS_ASSUMED_SHAPE
12068 && !sym->attr.pointer)))
12070 gfc_error ("'%s' at %L has the CONTIGUOUS attribute but is not an "
12071 "array pointer or an assumed-shape array", sym->name,
12072 &sym->declared_at);
12076 if (sym->attr.flavor == FL_DERIVED && resolve_fl_derived (sym) == FAILURE)
12079 /* Symbols that are module procedures with results (functions) have
12080 the types and array specification copied for type checking in
12081 procedures that call them, as well as for saving to a module
12082 file. These symbols can't stand the scrutiny that their results
12084 mp_flag = (sym->result != NULL && sym->result != sym);
12086 /* Make sure that the intrinsic is consistent with its internal
12087 representation. This needs to be done before assigning a default
12088 type to avoid spurious warnings. */
12089 if (sym->attr.flavor != FL_MODULE && sym->attr.intrinsic
12090 && resolve_intrinsic (sym, &sym->declared_at) == FAILURE)
12093 /* Resolve associate names. */
12095 resolve_assoc_var (sym, true);
12097 /* Assign default type to symbols that need one and don't have one. */
12098 if (sym->ts.type == BT_UNKNOWN)
12100 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER)
12101 gfc_set_default_type (sym, 1, NULL);
12103 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.external
12104 && !sym->attr.function && !sym->attr.subroutine
12105 && gfc_get_default_type (sym->name, sym->ns)->type == BT_UNKNOWN)
12106 gfc_add_subroutine (&sym->attr, sym->name, &sym->declared_at);
12108 if (sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12110 /* The specific case of an external procedure should emit an error
12111 in the case that there is no implicit type. */
12113 gfc_set_default_type (sym, sym->attr.external, NULL);
12116 /* Result may be in another namespace. */
12117 resolve_symbol (sym->result);
12119 if (!sym->result->attr.proc_pointer)
12121 sym->ts = sym->result->ts;
12122 sym->as = gfc_copy_array_spec (sym->result->as);
12123 sym->attr.dimension = sym->result->attr.dimension;
12124 sym->attr.pointer = sym->result->attr.pointer;
12125 sym->attr.allocatable = sym->result->attr.allocatable;
12126 sym->attr.contiguous = sym->result->attr.contiguous;
12131 else if (mp_flag && sym->attr.flavor == FL_PROCEDURE && sym->attr.function)
12132 gfc_resolve_array_spec (sym->result->as, false);
12134 /* Assumed size arrays and assumed shape arrays must be dummy
12135 arguments. Array-spec's of implied-shape should have been resolved to
12136 AS_EXPLICIT already. */
12140 gcc_assert (sym->as->type != AS_IMPLIED_SHAPE);
12141 if (((sym->as->type == AS_ASSUMED_SIZE && !sym->as->cp_was_assumed)
12142 || sym->as->type == AS_ASSUMED_SHAPE)
12143 && sym->attr.dummy == 0)
12145 if (sym->as->type == AS_ASSUMED_SIZE)
12146 gfc_error ("Assumed size array at %L must be a dummy argument",
12147 &sym->declared_at);
12149 gfc_error ("Assumed shape array at %L must be a dummy argument",
12150 &sym->declared_at);
12155 /* Make sure symbols with known intent or optional are really dummy
12156 variable. Because of ENTRY statement, this has to be deferred
12157 until resolution time. */
12159 if (!sym->attr.dummy
12160 && (sym->attr.optional || sym->attr.intent != INTENT_UNKNOWN))
12162 gfc_error ("Symbol at %L is not a DUMMY variable", &sym->declared_at);
12166 if (sym->attr.value && !sym->attr.dummy)
12168 gfc_error ("'%s' at %L cannot have the VALUE attribute because "
12169 "it is not a dummy argument", sym->name, &sym->declared_at);
12173 if (sym->attr.value && sym->ts.type == BT_CHARACTER)
12175 gfc_charlen *cl = sym->ts.u.cl;
12176 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT)
12178 gfc_error ("Character dummy variable '%s' at %L with VALUE "
12179 "attribute must have constant length",
12180 sym->name, &sym->declared_at);
12184 if (sym->ts.is_c_interop
12185 && mpz_cmp_si (cl->length->value.integer, 1) != 0)
12187 gfc_error ("C interoperable character dummy variable '%s' at %L "
12188 "with VALUE attribute must have length one",
12189 sym->name, &sym->declared_at);
12194 /* If the symbol is marked as bind(c), verify it's type and kind. Do not
12195 do this for something that was implicitly typed because that is handled
12196 in gfc_set_default_type. Handle dummy arguments and procedure
12197 definitions separately. Also, anything that is use associated is not
12198 handled here but instead is handled in the module it is declared in.
12199 Finally, derived type definitions are allowed to be BIND(C) since that
12200 only implies that they're interoperable, and they are checked fully for
12201 interoperability when a variable is declared of that type. */
12202 if (sym->attr.is_bind_c && sym->attr.implicit_type == 0 &&
12203 sym->attr.use_assoc == 0 && sym->attr.dummy == 0 &&
12204 sym->attr.flavor != FL_PROCEDURE && sym->attr.flavor != FL_DERIVED)
12206 gfc_try t = SUCCESS;
12208 /* First, make sure the variable is declared at the
12209 module-level scope (J3/04-007, Section 15.3). */
12210 if (sym->ns->proc_name->attr.flavor != FL_MODULE &&
12211 sym->attr.in_common == 0)
12213 gfc_error ("Variable '%s' at %L cannot be BIND(C) because it "
12214 "is neither a COMMON block nor declared at the "
12215 "module level scope", sym->name, &(sym->declared_at));
12218 else if (sym->common_head != NULL)
12220 t = verify_com_block_vars_c_interop (sym->common_head);
12224 /* If type() declaration, we need to verify that the components
12225 of the given type are all C interoperable, etc. */
12226 if (sym->ts.type == BT_DERIVED &&
12227 sym->ts.u.derived->attr.is_c_interop != 1)
12229 /* Make sure the user marked the derived type as BIND(C). If
12230 not, call the verify routine. This could print an error
12231 for the derived type more than once if multiple variables
12232 of that type are declared. */
12233 if (sym->ts.u.derived->attr.is_bind_c != 1)
12234 verify_bind_c_derived_type (sym->ts.u.derived);
12238 /* Verify the variable itself as C interoperable if it
12239 is BIND(C). It is not possible for this to succeed if
12240 the verify_bind_c_derived_type failed, so don't have to handle
12241 any error returned by verify_bind_c_derived_type. */
12242 t = verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
12243 sym->common_block);
12248 /* clear the is_bind_c flag to prevent reporting errors more than
12249 once if something failed. */
12250 sym->attr.is_bind_c = 0;
12255 /* If a derived type symbol has reached this point, without its
12256 type being declared, we have an error. Notice that most
12257 conditions that produce undefined derived types have already
12258 been dealt with. However, the likes of:
12259 implicit type(t) (t) ..... call foo (t) will get us here if
12260 the type is not declared in the scope of the implicit
12261 statement. Change the type to BT_UNKNOWN, both because it is so
12262 and to prevent an ICE. */
12263 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->components == NULL
12264 && !sym->ts.u.derived->attr.zero_comp)
12266 gfc_error ("The derived type '%s' at %L is of type '%s', "
12267 "which has not been defined", sym->name,
12268 &sym->declared_at, sym->ts.u.derived->name);
12269 sym->ts.type = BT_UNKNOWN;
12273 /* Make sure that the derived type has been resolved and that the
12274 derived type is visible in the symbol's namespace, if it is a
12275 module function and is not PRIVATE. */
12276 if (sym->ts.type == BT_DERIVED
12277 && sym->ts.u.derived->attr.use_assoc
12278 && sym->ns->proc_name
12279 && sym->ns->proc_name->attr.flavor == FL_MODULE)
12283 if (resolve_fl_derived (sym->ts.u.derived) == FAILURE)
12286 gfc_find_symbol (sym->ts.u.derived->name, sym->ns, 1, &ds);
12287 if (!ds && sym->attr.function && gfc_check_symbol_access (sym))
12289 symtree = gfc_new_symtree (&sym->ns->sym_root,
12290 sym->ts.u.derived->name);
12291 symtree->n.sym = sym->ts.u.derived;
12292 sym->ts.u.derived->refs++;
12296 /* Unless the derived-type declaration is use associated, Fortran 95
12297 does not allow public entries of private derived types.
12298 See 4.4.1 (F95) and 4.5.1.1 (F2003); and related interpretation
12299 161 in 95-006r3. */
12300 if (sym->ts.type == BT_DERIVED
12301 && sym->ns->proc_name && sym->ns->proc_name->attr.flavor == FL_MODULE
12302 && !sym->ts.u.derived->attr.use_assoc
12303 && gfc_check_symbol_access (sym)
12304 && !gfc_check_symbol_access (sym->ts.u.derived)
12305 && gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC %s '%s' at %L "
12306 "of PRIVATE derived type '%s'",
12307 (sym->attr.flavor == FL_PARAMETER) ? "parameter"
12308 : "variable", sym->name, &sym->declared_at,
12309 sym->ts.u.derived->name) == FAILURE)
12312 /* F2008, C1302. */
12313 if (sym->ts.type == BT_DERIVED
12314 && ((sym->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
12315 && sym->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
12316 || sym->ts.u.derived->attr.lock_comp)
12317 && !sym->attr.codimension && !sym->ts.u.derived->attr.coarray_comp)
12319 gfc_error ("Variable %s at %L of type LOCK_TYPE or with subcomponent of "
12320 "type LOCK_TYPE must be a coarray", sym->name,
12321 &sym->declared_at);
12325 /* An assumed-size array with INTENT(OUT) shall not be of a type for which
12326 default initialization is defined (5.1.2.4.4). */
12327 if (sym->ts.type == BT_DERIVED
12329 && sym->attr.intent == INTENT_OUT
12331 && sym->as->type == AS_ASSUMED_SIZE)
12333 for (c = sym->ts.u.derived->components; c; c = c->next)
12335 if (c->initializer)
12337 gfc_error ("The INTENT(OUT) dummy argument '%s' at %L is "
12338 "ASSUMED SIZE and so cannot have a default initializer",
12339 sym->name, &sym->declared_at);
12346 if (sym->ts.type == BT_DERIVED && sym->attr.dummy
12347 && sym->attr.intent == INTENT_OUT && sym->attr.lock_comp)
12349 gfc_error ("Dummy argument '%s' at %L of LOCK_TYPE shall not be "
12350 "INTENT(OUT)", sym->name, &sym->declared_at);
12355 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12356 || sym->attr.codimension)
12357 && (sym->attr.result || sym->result == sym))
12359 gfc_error ("Function result '%s' at %L shall not be a coarray or have "
12360 "a coarray component", sym->name, &sym->declared_at);
12365 if (sym->attr.codimension && sym->ts.type == BT_DERIVED
12366 && sym->ts.u.derived->ts.is_iso_c)
12368 gfc_error ("Variable '%s' at %L of TYPE(C_PTR) or TYPE(C_FUNPTR) "
12369 "shall not be a coarray", sym->name, &sym->declared_at);
12374 if (sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp
12375 && (sym->attr.codimension || sym->attr.pointer || sym->attr.dimension
12376 || sym->attr.allocatable))
12378 gfc_error ("Variable '%s' at %L with coarray component "
12379 "shall be a nonpointer, nonallocatable scalar",
12380 sym->name, &sym->declared_at);
12384 /* F2008, C526. The function-result case was handled above. */
12385 if (sym->attr.codimension
12386 && !(sym->attr.allocatable || sym->attr.dummy || sym->attr.save
12387 || sym->ns->save_all
12388 || sym->ns->proc_name->attr.flavor == FL_MODULE
12389 || sym->ns->proc_name->attr.is_main_program
12390 || sym->attr.function || sym->attr.result || sym->attr.use_assoc))
12392 gfc_error ("Variable '%s' at %L is a coarray and is not ALLOCATABLE, SAVE "
12393 "nor a dummy argument", sym->name, &sym->declared_at);
12396 /* F2008, C528. */ /* FIXME: sym->as check due to PR 43412. */
12397 else if (sym->attr.codimension && !sym->attr.allocatable
12398 && sym->as && sym->as->cotype == AS_DEFERRED)
12400 gfc_error ("Coarray variable '%s' at %L shall not have codimensions with "
12401 "deferred shape", sym->name, &sym->declared_at);
12404 else if (sym->attr.codimension && sym->attr.allocatable
12405 && (sym->as->type != AS_DEFERRED || sym->as->cotype != AS_DEFERRED))
12407 gfc_error ("Allocatable coarray variable '%s' at %L must have "
12408 "deferred shape", sym->name, &sym->declared_at);
12413 if (((sym->ts.type == BT_DERIVED && sym->ts.u.derived->attr.coarray_comp)
12414 || (sym->attr.codimension && sym->attr.allocatable))
12415 && sym->attr.dummy && sym->attr.intent == INTENT_OUT)
12417 gfc_error ("Variable '%s' at %L is INTENT(OUT) and can thus not be an "
12418 "allocatable coarray or have coarray components",
12419 sym->name, &sym->declared_at);
12423 if (sym->attr.codimension && sym->attr.dummy
12424 && sym->ns->proc_name && sym->ns->proc_name->attr.is_bind_c)
12426 gfc_error ("Coarray dummy variable '%s' at %L not allowed in BIND(C) "
12427 "procedure '%s'", sym->name, &sym->declared_at,
12428 sym->ns->proc_name->name);
12432 switch (sym->attr.flavor)
12435 if (resolve_fl_variable (sym, mp_flag) == FAILURE)
12440 if (resolve_fl_procedure (sym, mp_flag) == FAILURE)
12445 if (resolve_fl_namelist (sym) == FAILURE)
12450 if (resolve_fl_parameter (sym) == FAILURE)
12458 /* Resolve array specifier. Check as well some constraints
12459 on COMMON blocks. */
12461 check_constant = sym->attr.in_common && !sym->attr.pointer;
12463 /* Set the formal_arg_flag so that check_conflict will not throw
12464 an error for host associated variables in the specification
12465 expression for an array_valued function. */
12466 if (sym->attr.function && sym->as)
12467 formal_arg_flag = 1;
12469 gfc_resolve_array_spec (sym->as, check_constant);
12471 formal_arg_flag = 0;
12473 /* Resolve formal namespaces. */
12474 if (sym->formal_ns && sym->formal_ns != gfc_current_ns
12475 && !sym->attr.contained && !sym->attr.intrinsic)
12476 gfc_resolve (sym->formal_ns);
12478 /* Make sure the formal namespace is present. */
12479 if (sym->formal && !sym->formal_ns)
12481 gfc_formal_arglist *formal = sym->formal;
12482 while (formal && !formal->sym)
12483 formal = formal->next;
12487 sym->formal_ns = formal->sym->ns;
12488 sym->formal_ns->refs++;
12492 /* Check threadprivate restrictions. */
12493 if (sym->attr.threadprivate && !sym->attr.save && !sym->ns->save_all
12494 && (!sym->attr.in_common
12495 && sym->module == NULL
12496 && (sym->ns->proc_name == NULL
12497 || sym->ns->proc_name->attr.flavor != FL_MODULE)))
12498 gfc_error ("Threadprivate at %L isn't SAVEd", &sym->declared_at);
12500 /* If we have come this far we can apply default-initializers, as
12501 described in 14.7.5, to those variables that have not already
12502 been assigned one. */
12503 if (sym->ts.type == BT_DERIVED
12504 && sym->ns == gfc_current_ns
12506 && !sym->attr.allocatable
12507 && !sym->attr.alloc_comp)
12509 symbol_attribute *a = &sym->attr;
12511 if ((!a->save && !a->dummy && !a->pointer
12512 && !a->in_common && !a->use_assoc
12513 && (a->referenced || a->result)
12514 && !(a->function && sym != sym->result))
12515 || (a->dummy && a->intent == INTENT_OUT && !a->pointer))
12516 apply_default_init (sym);
12519 if (sym->ts.type == BT_CLASS && sym->ns == gfc_current_ns
12520 && sym->attr.dummy && sym->attr.intent == INTENT_OUT
12521 && !CLASS_DATA (sym)->attr.class_pointer
12522 && !CLASS_DATA (sym)->attr.allocatable)
12523 apply_default_init (sym);
12525 /* If this symbol has a type-spec, check it. */
12526 if (sym->attr.flavor == FL_VARIABLE || sym->attr.flavor == FL_PARAMETER
12527 || (sym->attr.flavor == FL_PROCEDURE && sym->attr.function))
12528 if (resolve_typespec_used (&sym->ts, &sym->declared_at, sym->name)
12534 /************* Resolve DATA statements *************/
12538 gfc_data_value *vnode;
12544 /* Advance the values structure to point to the next value in the data list. */
12547 next_data_value (void)
12549 while (mpz_cmp_ui (values.left, 0) == 0)
12552 if (values.vnode->next == NULL)
12555 values.vnode = values.vnode->next;
12556 mpz_set (values.left, values.vnode->repeat);
12564 check_data_variable (gfc_data_variable *var, locus *where)
12570 ar_type mark = AR_UNKNOWN;
12572 mpz_t section_index[GFC_MAX_DIMENSIONS];
12578 if (gfc_resolve_expr (var->expr) == FAILURE)
12582 mpz_init_set_si (offset, 0);
12585 if (e->expr_type != EXPR_VARIABLE)
12586 gfc_internal_error ("check_data_variable(): Bad expression");
12588 sym = e->symtree->n.sym;
12590 if (sym->ns->is_block_data && !sym->attr.in_common)
12592 gfc_error ("BLOCK DATA element '%s' at %L must be in COMMON",
12593 sym->name, &sym->declared_at);
12596 if (e->ref == NULL && sym->as)
12598 gfc_error ("DATA array '%s' at %L must be specified in a previous"
12599 " declaration", sym->name, where);
12603 has_pointer = sym->attr.pointer;
12605 if (gfc_is_coindexed (e))
12607 gfc_error ("DATA element '%s' at %L cannot have a coindex", sym->name,
12612 for (ref = e->ref; ref; ref = ref->next)
12614 if (ref->type == REF_COMPONENT && ref->u.c.component->attr.pointer)
12618 && ref->type == REF_ARRAY
12619 && ref->u.ar.type != AR_FULL)
12621 gfc_error ("DATA element '%s' at %L is a pointer and so must "
12622 "be a full array", sym->name, where);
12627 if (e->rank == 0 || has_pointer)
12629 mpz_init_set_ui (size, 1);
12636 /* Find the array section reference. */
12637 for (ref = e->ref; ref; ref = ref->next)
12639 if (ref->type != REF_ARRAY)
12641 if (ref->u.ar.type == AR_ELEMENT)
12647 /* Set marks according to the reference pattern. */
12648 switch (ref->u.ar.type)
12656 /* Get the start position of array section. */
12657 gfc_get_section_index (ar, section_index, &offset);
12662 gcc_unreachable ();
12665 if (gfc_array_size (e, &size) == FAILURE)
12667 gfc_error ("Nonconstant array section at %L in DATA statement",
12669 mpz_clear (offset);
12676 while (mpz_cmp_ui (size, 0) > 0)
12678 if (next_data_value () == FAILURE)
12680 gfc_error ("DATA statement at %L has more variables than values",
12686 t = gfc_check_assign (var->expr, values.vnode->expr, 0);
12690 /* If we have more than one element left in the repeat count,
12691 and we have more than one element left in the target variable,
12692 then create a range assignment. */
12693 /* FIXME: Only done for full arrays for now, since array sections
12695 if (mark == AR_FULL && ref && ref->next == NULL
12696 && mpz_cmp_ui (values.left, 1) > 0 && mpz_cmp_ui (size, 1) > 0)
12700 if (mpz_cmp (size, values.left) >= 0)
12702 mpz_init_set (range, values.left);
12703 mpz_sub (size, size, values.left);
12704 mpz_set_ui (values.left, 0);
12708 mpz_init_set (range, size);
12709 mpz_sub (values.left, values.left, size);
12710 mpz_set_ui (size, 0);
12713 t = gfc_assign_data_value (var->expr, values.vnode->expr,
12716 mpz_add (offset, offset, range);
12723 /* Assign initial value to symbol. */
12726 mpz_sub_ui (values.left, values.left, 1);
12727 mpz_sub_ui (size, size, 1);
12729 t = gfc_assign_data_value (var->expr, values.vnode->expr,
12734 if (mark == AR_FULL)
12735 mpz_add_ui (offset, offset, 1);
12737 /* Modify the array section indexes and recalculate the offset
12738 for next element. */
12739 else if (mark == AR_SECTION)
12740 gfc_advance_section (section_index, ar, &offset);
12744 if (mark == AR_SECTION)
12746 for (i = 0; i < ar->dimen; i++)
12747 mpz_clear (section_index[i]);
12751 mpz_clear (offset);
12757 static gfc_try traverse_data_var (gfc_data_variable *, locus *);
12759 /* Iterate over a list of elements in a DATA statement. */
12762 traverse_data_list (gfc_data_variable *var, locus *where)
12765 iterator_stack frame;
12766 gfc_expr *e, *start, *end, *step;
12767 gfc_try retval = SUCCESS;
12769 mpz_init (frame.value);
12772 start = gfc_copy_expr (var->iter.start);
12773 end = gfc_copy_expr (var->iter.end);
12774 step = gfc_copy_expr (var->iter.step);
12776 if (gfc_simplify_expr (start, 1) == FAILURE
12777 || start->expr_type != EXPR_CONSTANT)
12779 gfc_error ("start of implied-do loop at %L could not be "
12780 "simplified to a constant value", &start->where);
12784 if (gfc_simplify_expr (end, 1) == FAILURE
12785 || end->expr_type != EXPR_CONSTANT)
12787 gfc_error ("end of implied-do loop at %L could not be "
12788 "simplified to a constant value", &start->where);
12792 if (gfc_simplify_expr (step, 1) == FAILURE
12793 || step->expr_type != EXPR_CONSTANT)
12795 gfc_error ("step of implied-do loop at %L could not be "
12796 "simplified to a constant value", &start->where);
12801 mpz_set (trip, end->value.integer);
12802 mpz_sub (trip, trip, start->value.integer);
12803 mpz_add (trip, trip, step->value.integer);
12805 mpz_div (trip, trip, step->value.integer);
12807 mpz_set (frame.value, start->value.integer);
12809 frame.prev = iter_stack;
12810 frame.variable = var->iter.var->symtree;
12811 iter_stack = &frame;
12813 while (mpz_cmp_ui (trip, 0) > 0)
12815 if (traverse_data_var (var->list, where) == FAILURE)
12821 e = gfc_copy_expr (var->expr);
12822 if (gfc_simplify_expr (e, 1) == FAILURE)
12829 mpz_add (frame.value, frame.value, step->value.integer);
12831 mpz_sub_ui (trip, trip, 1);
12835 mpz_clear (frame.value);
12838 gfc_free_expr (start);
12839 gfc_free_expr (end);
12840 gfc_free_expr (step);
12842 iter_stack = frame.prev;
12847 /* Type resolve variables in the variable list of a DATA statement. */
12850 traverse_data_var (gfc_data_variable *var, locus *where)
12854 for (; var; var = var->next)
12856 if (var->expr == NULL)
12857 t = traverse_data_list (var, where);
12859 t = check_data_variable (var, where);
12869 /* Resolve the expressions and iterators associated with a data statement.
12870 This is separate from the assignment checking because data lists should
12871 only be resolved once. */
12874 resolve_data_variables (gfc_data_variable *d)
12876 for (; d; d = d->next)
12878 if (d->list == NULL)
12880 if (gfc_resolve_expr (d->expr) == FAILURE)
12885 if (gfc_resolve_iterator (&d->iter, false) == FAILURE)
12888 if (resolve_data_variables (d->list) == FAILURE)
12897 /* Resolve a single DATA statement. We implement this by storing a pointer to
12898 the value list into static variables, and then recursively traversing the
12899 variables list, expanding iterators and such. */
12902 resolve_data (gfc_data *d)
12905 if (resolve_data_variables (d->var) == FAILURE)
12908 values.vnode = d->value;
12909 if (d->value == NULL)
12910 mpz_set_ui (values.left, 0);
12912 mpz_set (values.left, d->value->repeat);
12914 if (traverse_data_var (d->var, &d->where) == FAILURE)
12917 /* At this point, we better not have any values left. */
12919 if (next_data_value () == SUCCESS)
12920 gfc_error ("DATA statement at %L has more values than variables",
12925 /* 12.6 Constraint: In a pure subprogram any variable which is in common or
12926 accessed by host or use association, is a dummy argument to a pure function,
12927 is a dummy argument with INTENT (IN) to a pure subroutine, or an object that
12928 is storage associated with any such variable, shall not be used in the
12929 following contexts: (clients of this function). */
12931 /* Determines if a variable is not 'pure', i.e., not assignable within a pure
12932 procedure. Returns zero if assignment is OK, nonzero if there is a
12935 gfc_impure_variable (gfc_symbol *sym)
12940 if (sym->attr.use_assoc || sym->attr.in_common)
12943 /* Check if the symbol's ns is inside the pure procedure. */
12944 for (ns = gfc_current_ns; ns; ns = ns->parent)
12948 if (ns->proc_name->attr.flavor == FL_PROCEDURE && !sym->attr.function)
12952 proc = sym->ns->proc_name;
12953 if (sym->attr.dummy && gfc_pure (proc)
12954 && ((proc->attr.subroutine && sym->attr.intent == INTENT_IN)
12956 proc->attr.function))
12959 /* TODO: Sort out what can be storage associated, if anything, and include
12960 it here. In principle equivalences should be scanned but it does not
12961 seem to be possible to storage associate an impure variable this way. */
12966 /* Test whether a symbol is pure or not. For a NULL pointer, checks if the
12967 current namespace is inside a pure procedure. */
12970 gfc_pure (gfc_symbol *sym)
12972 symbol_attribute attr;
12977 /* Check if the current namespace or one of its parents
12978 belongs to a pure procedure. */
12979 for (ns = gfc_current_ns; ns; ns = ns->parent)
12981 sym = ns->proc_name;
12985 if (attr.flavor == FL_PROCEDURE && attr.pure)
12993 return attr.flavor == FL_PROCEDURE && attr.pure;
12997 /* Test whether a symbol is implicitly pure or not. For a NULL pointer,
12998 checks if the current namespace is implicitly pure. Note that this
12999 function returns false for a PURE procedure. */
13002 gfc_implicit_pure (gfc_symbol *sym)
13004 symbol_attribute attr;
13008 /* Check if the current namespace is implicit_pure. */
13009 sym = gfc_current_ns->proc_name;
13013 if (attr.flavor == FL_PROCEDURE
13014 && attr.implicit_pure && !attr.pure)
13021 return attr.flavor == FL_PROCEDURE && attr.implicit_pure && !attr.pure;
13025 /* Test whether the current procedure is elemental or not. */
13028 gfc_elemental (gfc_symbol *sym)
13030 symbol_attribute attr;
13033 sym = gfc_current_ns->proc_name;
13038 return attr.flavor == FL_PROCEDURE && attr.elemental;
13042 /* Warn about unused labels. */
13045 warn_unused_fortran_label (gfc_st_label *label)
13050 warn_unused_fortran_label (label->left);
13052 if (label->defined == ST_LABEL_UNKNOWN)
13055 switch (label->referenced)
13057 case ST_LABEL_UNKNOWN:
13058 gfc_warning ("Label %d at %L defined but not used", label->value,
13062 case ST_LABEL_BAD_TARGET:
13063 gfc_warning ("Label %d at %L defined but cannot be used",
13064 label->value, &label->where);
13071 warn_unused_fortran_label (label->right);
13075 /* Returns the sequence type of a symbol or sequence. */
13078 sequence_type (gfc_typespec ts)
13087 if (ts.u.derived->components == NULL)
13088 return SEQ_NONDEFAULT;
13090 result = sequence_type (ts.u.derived->components->ts);
13091 for (c = ts.u.derived->components->next; c; c = c->next)
13092 if (sequence_type (c->ts) != result)
13098 if (ts.kind != gfc_default_character_kind)
13099 return SEQ_NONDEFAULT;
13101 return SEQ_CHARACTER;
13104 if (ts.kind != gfc_default_integer_kind)
13105 return SEQ_NONDEFAULT;
13107 return SEQ_NUMERIC;
13110 if (!(ts.kind == gfc_default_real_kind
13111 || ts.kind == gfc_default_double_kind))
13112 return SEQ_NONDEFAULT;
13114 return SEQ_NUMERIC;
13117 if (ts.kind != gfc_default_complex_kind)
13118 return SEQ_NONDEFAULT;
13120 return SEQ_NUMERIC;
13123 if (ts.kind != gfc_default_logical_kind)
13124 return SEQ_NONDEFAULT;
13126 return SEQ_NUMERIC;
13129 return SEQ_NONDEFAULT;
13134 /* Resolve derived type EQUIVALENCE object. */
13137 resolve_equivalence_derived (gfc_symbol *derived, gfc_symbol *sym, gfc_expr *e)
13139 gfc_component *c = derived->components;
13144 /* Shall not be an object of nonsequence derived type. */
13145 if (!derived->attr.sequence)
13147 gfc_error ("Derived type variable '%s' at %L must have SEQUENCE "
13148 "attribute to be an EQUIVALENCE object", sym->name,
13153 /* Shall not have allocatable components. */
13154 if (derived->attr.alloc_comp)
13156 gfc_error ("Derived type variable '%s' at %L cannot have ALLOCATABLE "
13157 "components to be an EQUIVALENCE object",sym->name,
13162 if (sym->attr.in_common && gfc_has_default_initializer (sym->ts.u.derived))
13164 gfc_error ("Derived type variable '%s' at %L with default "
13165 "initialization cannot be in EQUIVALENCE with a variable "
13166 "in COMMON", sym->name, &e->where);
13170 for (; c ; c = c->next)
13172 if (c->ts.type == BT_DERIVED
13173 && (resolve_equivalence_derived (c->ts.u.derived, sym, e) == FAILURE))
13176 /* Shall not be an object of sequence derived type containing a pointer
13177 in the structure. */
13178 if (c->attr.pointer)
13180 gfc_error ("Derived type variable '%s' at %L with pointer "
13181 "component(s) cannot be an EQUIVALENCE object",
13182 sym->name, &e->where);
13190 /* Resolve equivalence object.
13191 An EQUIVALENCE object shall not be a dummy argument, a pointer, a target,
13192 an allocatable array, an object of nonsequence derived type, an object of
13193 sequence derived type containing a pointer at any level of component
13194 selection, an automatic object, a function name, an entry name, a result
13195 name, a named constant, a structure component, or a subobject of any of
13196 the preceding objects. A substring shall not have length zero. A
13197 derived type shall not have components with default initialization nor
13198 shall two objects of an equivalence group be initialized.
13199 Either all or none of the objects shall have an protected attribute.
13200 The simple constraints are done in symbol.c(check_conflict) and the rest
13201 are implemented here. */
13204 resolve_equivalence (gfc_equiv *eq)
13207 gfc_symbol *first_sym;
13210 locus *last_where = NULL;
13211 seq_type eq_type, last_eq_type;
13212 gfc_typespec *last_ts;
13213 int object, cnt_protected;
13216 last_ts = &eq->expr->symtree->n.sym->ts;
13218 first_sym = eq->expr->symtree->n.sym;
13222 for (object = 1; eq; eq = eq->eq, object++)
13226 e->ts = e->symtree->n.sym->ts;
13227 /* match_varspec might not know yet if it is seeing
13228 array reference or substring reference, as it doesn't
13230 if (e->ref && e->ref->type == REF_ARRAY)
13232 gfc_ref *ref = e->ref;
13233 sym = e->symtree->n.sym;
13235 if (sym->attr.dimension)
13237 ref->u.ar.as = sym->as;
13241 /* For substrings, convert REF_ARRAY into REF_SUBSTRING. */
13242 if (e->ts.type == BT_CHARACTER
13244 && ref->type == REF_ARRAY
13245 && ref->u.ar.dimen == 1
13246 && ref->u.ar.dimen_type[0] == DIMEN_RANGE
13247 && ref->u.ar.stride[0] == NULL)
13249 gfc_expr *start = ref->u.ar.start[0];
13250 gfc_expr *end = ref->u.ar.end[0];
13253 /* Optimize away the (:) reference. */
13254 if (start == NULL && end == NULL)
13257 e->ref = ref->next;
13259 e->ref->next = ref->next;
13264 ref->type = REF_SUBSTRING;
13266 start = gfc_get_int_expr (gfc_default_integer_kind,
13268 ref->u.ss.start = start;
13269 if (end == NULL && e->ts.u.cl)
13270 end = gfc_copy_expr (e->ts.u.cl->length);
13271 ref->u.ss.end = end;
13272 ref->u.ss.length = e->ts.u.cl;
13279 /* Any further ref is an error. */
13282 gcc_assert (ref->type == REF_ARRAY);
13283 gfc_error ("Syntax error in EQUIVALENCE statement at %L",
13289 if (gfc_resolve_expr (e) == FAILURE)
13292 sym = e->symtree->n.sym;
13294 if (sym->attr.is_protected)
13296 if (cnt_protected > 0 && cnt_protected != object)
13298 gfc_error ("Either all or none of the objects in the "
13299 "EQUIVALENCE set at %L shall have the "
13300 "PROTECTED attribute",
13305 /* Shall not equivalence common block variables in a PURE procedure. */
13306 if (sym->ns->proc_name
13307 && sym->ns->proc_name->attr.pure
13308 && sym->attr.in_common)
13310 gfc_error ("Common block member '%s' at %L cannot be an EQUIVALENCE "
13311 "object in the pure procedure '%s'",
13312 sym->name, &e->where, sym->ns->proc_name->name);
13316 /* Shall not be a named constant. */
13317 if (e->expr_type == EXPR_CONSTANT)
13319 gfc_error ("Named constant '%s' at %L cannot be an EQUIVALENCE "
13320 "object", sym->name, &e->where);
13324 if (e->ts.type == BT_DERIVED
13325 && resolve_equivalence_derived (e->ts.u.derived, sym, e) == FAILURE)
13328 /* Check that the types correspond correctly:
13330 A numeric sequence structure may be equivalenced to another sequence
13331 structure, an object of default integer type, default real type, double
13332 precision real type, default logical type such that components of the
13333 structure ultimately only become associated to objects of the same
13334 kind. A character sequence structure may be equivalenced to an object
13335 of default character kind or another character sequence structure.
13336 Other objects may be equivalenced only to objects of the same type and
13337 kind parameters. */
13339 /* Identical types are unconditionally OK. */
13340 if (object == 1 || gfc_compare_types (last_ts, &sym->ts))
13341 goto identical_types;
13343 last_eq_type = sequence_type (*last_ts);
13344 eq_type = sequence_type (sym->ts);
13346 /* Since the pair of objects is not of the same type, mixed or
13347 non-default sequences can be rejected. */
13349 msg = "Sequence %s with mixed components in EQUIVALENCE "
13350 "statement at %L with different type objects";
13352 && last_eq_type == SEQ_MIXED
13353 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name, last_where)
13355 || (eq_type == SEQ_MIXED
13356 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13357 &e->where) == FAILURE))
13360 msg = "Non-default type object or sequence %s in EQUIVALENCE "
13361 "statement at %L with objects of different type";
13363 && last_eq_type == SEQ_NONDEFAULT
13364 && gfc_notify_std (GFC_STD_GNU, msg, first_sym->name,
13365 last_where) == FAILURE)
13366 || (eq_type == SEQ_NONDEFAULT
13367 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13368 &e->where) == FAILURE))
13371 msg ="Non-CHARACTER object '%s' in default CHARACTER "
13372 "EQUIVALENCE statement at %L";
13373 if (last_eq_type == SEQ_CHARACTER
13374 && eq_type != SEQ_CHARACTER
13375 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13376 &e->where) == FAILURE)
13379 msg ="Non-NUMERIC object '%s' in default NUMERIC "
13380 "EQUIVALENCE statement at %L";
13381 if (last_eq_type == SEQ_NUMERIC
13382 && eq_type != SEQ_NUMERIC
13383 && gfc_notify_std (GFC_STD_GNU, msg, sym->name,
13384 &e->where) == FAILURE)
13389 last_where = &e->where;
13394 /* Shall not be an automatic array. */
13395 if (e->ref->type == REF_ARRAY
13396 && gfc_resolve_array_spec (e->ref->u.ar.as, 1) == FAILURE)
13398 gfc_error ("Array '%s' at %L with non-constant bounds cannot be "
13399 "an EQUIVALENCE object", sym->name, &e->where);
13406 /* Shall not be a structure component. */
13407 if (r->type == REF_COMPONENT)
13409 gfc_error ("Structure component '%s' at %L cannot be an "
13410 "EQUIVALENCE object",
13411 r->u.c.component->name, &e->where);
13415 /* A substring shall not have length zero. */
13416 if (r->type == REF_SUBSTRING)
13418 if (compare_bound (r->u.ss.start, r->u.ss.end) == CMP_GT)
13420 gfc_error ("Substring at %L has length zero",
13421 &r->u.ss.start->where);
13431 /* Resolve function and ENTRY types, issue diagnostics if needed. */
13434 resolve_fntype (gfc_namespace *ns)
13436 gfc_entry_list *el;
13439 if (ns->proc_name == NULL || !ns->proc_name->attr.function)
13442 /* If there are any entries, ns->proc_name is the entry master
13443 synthetic symbol and ns->entries->sym actual FUNCTION symbol. */
13445 sym = ns->entries->sym;
13447 sym = ns->proc_name;
13448 if (sym->result == sym
13449 && sym->ts.type == BT_UNKNOWN
13450 && gfc_set_default_type (sym, 0, NULL) == FAILURE
13451 && !sym->attr.untyped)
13453 gfc_error ("Function '%s' at %L has no IMPLICIT type",
13454 sym->name, &sym->declared_at);
13455 sym->attr.untyped = 1;
13458 if (sym->ts.type == BT_DERIVED && !sym->ts.u.derived->attr.use_assoc
13459 && !sym->attr.contained
13460 && !gfc_check_symbol_access (sym->ts.u.derived)
13461 && gfc_check_symbol_access (sym))
13463 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PUBLIC function '%s' at "
13464 "%L of PRIVATE type '%s'", sym->name,
13465 &sym->declared_at, sym->ts.u.derived->name);
13469 for (el = ns->entries->next; el; el = el->next)
13471 if (el->sym->result == el->sym
13472 && el->sym->ts.type == BT_UNKNOWN
13473 && gfc_set_default_type (el->sym, 0, NULL) == FAILURE
13474 && !el->sym->attr.untyped)
13476 gfc_error ("ENTRY '%s' at %L has no IMPLICIT type",
13477 el->sym->name, &el->sym->declared_at);
13478 el->sym->attr.untyped = 1;
13484 /* 12.3.2.1.1 Defined operators. */
13487 check_uop_procedure (gfc_symbol *sym, locus where)
13489 gfc_formal_arglist *formal;
13491 if (!sym->attr.function)
13493 gfc_error ("User operator procedure '%s' at %L must be a FUNCTION",
13494 sym->name, &where);
13498 if (sym->ts.type == BT_CHARACTER
13499 && !(sym->ts.u.cl && sym->ts.u.cl->length)
13500 && !(sym->result && sym->result->ts.u.cl
13501 && sym->result->ts.u.cl->length))
13503 gfc_error ("User operator procedure '%s' at %L cannot be assumed "
13504 "character length", sym->name, &where);
13508 formal = sym->formal;
13509 if (!formal || !formal->sym)
13511 gfc_error ("User operator procedure '%s' at %L must have at least "
13512 "one argument", sym->name, &where);
13516 if (formal->sym->attr.intent != INTENT_IN)
13518 gfc_error ("First argument of operator interface at %L must be "
13519 "INTENT(IN)", &where);
13523 if (formal->sym->attr.optional)
13525 gfc_error ("First argument of operator interface at %L cannot be "
13526 "optional", &where);
13530 formal = formal->next;
13531 if (!formal || !formal->sym)
13534 if (formal->sym->attr.intent != INTENT_IN)
13536 gfc_error ("Second argument of operator interface at %L must be "
13537 "INTENT(IN)", &where);
13541 if (formal->sym->attr.optional)
13543 gfc_error ("Second argument of operator interface at %L cannot be "
13544 "optional", &where);
13550 gfc_error ("Operator interface at %L must have, at most, two "
13551 "arguments", &where);
13559 gfc_resolve_uops (gfc_symtree *symtree)
13561 gfc_interface *itr;
13563 if (symtree == NULL)
13566 gfc_resolve_uops (symtree->left);
13567 gfc_resolve_uops (symtree->right);
13569 for (itr = symtree->n.uop->op; itr; itr = itr->next)
13570 check_uop_procedure (itr->sym, itr->sym->declared_at);
13574 /* Examine all of the expressions associated with a program unit,
13575 assign types to all intermediate expressions, make sure that all
13576 assignments are to compatible types and figure out which names
13577 refer to which functions or subroutines. It doesn't check code
13578 block, which is handled by resolve_code. */
13581 resolve_types (gfc_namespace *ns)
13587 gfc_namespace* old_ns = gfc_current_ns;
13589 /* Check that all IMPLICIT types are ok. */
13590 if (!ns->seen_implicit_none)
13593 for (letter = 0; letter != GFC_LETTERS; ++letter)
13594 if (ns->set_flag[letter]
13595 && resolve_typespec_used (&ns->default_type[letter],
13596 &ns->implicit_loc[letter],
13601 gfc_current_ns = ns;
13603 resolve_entries (ns);
13605 resolve_common_vars (ns->blank_common.head, false);
13606 resolve_common_blocks (ns->common_root);
13608 resolve_contained_functions (ns);
13610 if (ns->proc_name && ns->proc_name->attr.flavor == FL_PROCEDURE
13611 && ns->proc_name->attr.if_source == IFSRC_IFBODY)
13612 resolve_formal_arglist (ns->proc_name);
13614 gfc_traverse_ns (ns, resolve_bind_c_derived_types);
13616 for (cl = ns->cl_list; cl; cl = cl->next)
13617 resolve_charlen (cl);
13619 gfc_traverse_ns (ns, resolve_symbol);
13621 resolve_fntype (ns);
13623 for (n = ns->contained; n; n = n->sibling)
13625 if (gfc_pure (ns->proc_name) && !gfc_pure (n->proc_name))
13626 gfc_error ("Contained procedure '%s' at %L of a PURE procedure must "
13627 "also be PURE", n->proc_name->name,
13628 &n->proc_name->declared_at);
13634 do_concurrent_flag = 0;
13635 gfc_check_interfaces (ns);
13637 gfc_traverse_ns (ns, resolve_values);
13643 for (d = ns->data; d; d = d->next)
13647 gfc_traverse_ns (ns, gfc_formalize_init_value);
13649 gfc_traverse_ns (ns, gfc_verify_binding_labels);
13651 if (ns->common_root != NULL)
13652 gfc_traverse_symtree (ns->common_root, resolve_bind_c_comms);
13654 for (eq = ns->equiv; eq; eq = eq->next)
13655 resolve_equivalence (eq);
13657 /* Warn about unused labels. */
13658 if (warn_unused_label)
13659 warn_unused_fortran_label (ns->st_labels);
13661 gfc_resolve_uops (ns->uop_root);
13663 gfc_current_ns = old_ns;
13667 /* Call resolve_code recursively. */
13670 resolve_codes (gfc_namespace *ns)
13673 bitmap_obstack old_obstack;
13675 if (ns->resolved == 1)
13678 for (n = ns->contained; n; n = n->sibling)
13681 gfc_current_ns = ns;
13683 /* Don't clear 'cs_base' if this is the namespace of a BLOCK construct. */
13684 if (!(ns->proc_name && ns->proc_name->attr.flavor == FL_LABEL))
13687 /* Set to an out of range value. */
13688 current_entry_id = -1;
13690 old_obstack = labels_obstack;
13691 bitmap_obstack_initialize (&labels_obstack);
13693 resolve_code (ns->code, ns);
13695 bitmap_obstack_release (&labels_obstack);
13696 labels_obstack = old_obstack;
13700 /* This function is called after a complete program unit has been compiled.
13701 Its purpose is to examine all of the expressions associated with a program
13702 unit, assign types to all intermediate expressions, make sure that all
13703 assignments are to compatible types and figure out which names refer to
13704 which functions or subroutines. */
13707 gfc_resolve (gfc_namespace *ns)
13709 gfc_namespace *old_ns;
13710 code_stack *old_cs_base;
13716 old_ns = gfc_current_ns;
13717 old_cs_base = cs_base;
13719 resolve_types (ns);
13720 resolve_codes (ns);
13722 gfc_current_ns = old_ns;
13723 cs_base = old_cs_base;
13726 gfc_run_passes (ns);