1 /* Implementation of Fortran 2003 Polymorphism.
2 Copyright (C) 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Paul Richard Thomas <pault@gcc.gnu.org>
5 and Janus Weil <janus@gcc.gnu.org>
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/>. */
24 /* class.c -- This file contains the front end functions needed to service
25 the implementation of Fortran 2003 polymorphism and other
26 object-oriented features. */
29 /* Outline of the internal representation:
31 Each CLASS variable is encapsulated by a class container, which is a
32 structure with two fields:
33 * _data: A pointer to the actual data of the variable. This field has the
34 declared type of the class variable and its attributes
35 (pointer/allocatable/dimension/...).
36 * _vptr: A pointer to the vtable entry (see below) of the dynamic type.
38 For each derived type we set up a "vtable" entry, i.e. a structure with the
40 * _hash: A hash value serving as a unique identifier for this type.
41 * _size: The size in bytes of the derived type.
42 * _extends: A pointer to the vtable entry of the parent derived type.
43 * _def_init: A pointer to a default initialized variable of this type.
44 * _copy: A procedure pointer to a copying procedure.
45 After these follow procedure pointer components for the specific
46 type-bound procedures. */
52 #include "constructor.h"
55 /* Insert a reference to the component of the given name.
56 Only to be used with CLASS containers and vtables. */
59 gfc_add_component_ref (gfc_expr *e, const char *name)
61 gfc_ref **tail = &(e->ref);
63 gfc_symbol *derived = e->symtree->n.sym->ts.u.derived;
66 if ((*tail)->type == REF_COMPONENT)
68 if (strcmp ((*tail)->u.c.component->name, "_data") == 0
70 && (*tail)->next->type == REF_ARRAY
71 && (*tail)->next->next == NULL)
73 derived = (*tail)->u.c.component->ts.u.derived;
75 if ((*tail)->type == REF_ARRAY && (*tail)->next == NULL)
77 tail = &((*tail)->next);
79 if (*tail != NULL && strcmp (name, "_data") == 0)
81 (*tail) = gfc_get_ref();
83 (*tail)->type = REF_COMPONENT;
84 (*tail)->u.c.sym = derived;
85 (*tail)->u.c.component = gfc_find_component (derived, name, true, true);
86 gcc_assert((*tail)->u.c.component);
88 e->ts = (*tail)->u.c.component->ts;
92 /* This is used to add both the _data component reference and an array
93 reference to class expressions. Used in translation of intrinsic
94 array inquiry functions. */
97 gfc_add_class_array_ref (gfc_expr *e)
99 int rank = CLASS_DATA (e)->as->rank;
100 gfc_array_spec *as = CLASS_DATA (e)->as;
102 gfc_add_component_ref (e, "_data");
104 for (ref = e->ref; ref; ref = ref->next)
107 if (ref->type != REF_ARRAY)
109 ref->next = gfc_get_ref ();
111 ref->type = REF_ARRAY;
112 ref->u.ar.type = AR_FULL;
118 /* Unfortunately, class array expressions can appear in various conditions;
119 with and without both _data component and an arrayspec. This function
120 deals with that variability. The previous reference to 'ref' is to a
124 class_array_ref_detected (gfc_ref *ref, bool *full_array)
126 bool no_data = false;
127 bool with_data = false;
129 /* An array reference with no _data component. */
130 if (ref && ref->type == REF_ARRAY
132 && ref->u.ar.type != AR_ELEMENT)
135 *full_array = ref->u.ar.type == AR_FULL;
139 /* Cover cases where _data appears, with or without an array ref. */
140 if (ref && ref->type == REF_COMPONENT
141 && strcmp (ref->u.c.component->name, "_data") == 0)
149 else if (ref->next && ref->next->type == REF_ARRAY
151 && ref->type == REF_COMPONENT
152 && ref->next->type == REF_ARRAY
153 && ref->next->u.ar.type != AR_ELEMENT)
157 *full_array = ref->next->u.ar.type == AR_FULL;
161 return no_data || with_data;
165 /* Returns true if the expression contains a reference to a class
166 array. Notice that class array elements return false. */
169 gfc_is_class_array_ref (gfc_expr *e, bool *full_array)
179 /* Is this a class array object? ie. Is the symbol of type class? */
181 && e->symtree->n.sym->ts.type == BT_CLASS
182 && CLASS_DATA (e->symtree->n.sym)
183 && CLASS_DATA (e->symtree->n.sym)->attr.dimension
184 && class_array_ref_detected (e->ref, full_array))
187 /* Or is this a class array component reference? */
188 for (ref = e->ref; ref; ref = ref->next)
190 if (ref->type == REF_COMPONENT
191 && ref->u.c.component->ts.type == BT_CLASS
192 && CLASS_DATA (ref->u.c.component)->attr.dimension
193 && class_array_ref_detected (ref->next, full_array))
201 /* Returns true if the expression is a reference to a class
202 scalar. This function is necessary because such expressions
203 can be dressed with a reference to the _data component and so
204 have a type other than BT_CLASS. */
207 gfc_is_class_scalar_expr (gfc_expr *e)
214 /* Is this a class object? */
216 && e->symtree->n.sym->ts.type == BT_CLASS
217 && CLASS_DATA (e->symtree->n.sym)
218 && !CLASS_DATA (e->symtree->n.sym)->attr.dimension
220 || (strcmp (e->ref->u.c.component->name, "_data") == 0
221 && e->ref->next == NULL)))
224 /* Or is the final reference BT_CLASS or _data? */
225 for (ref = e->ref; ref; ref = ref->next)
227 if (ref->type == REF_COMPONENT
228 && ref->u.c.component->ts.type == BT_CLASS
229 && CLASS_DATA (ref->u.c.component)
230 && !CLASS_DATA (ref->u.c.component)->attr.dimension
231 && (ref->next == NULL
232 || (strcmp (ref->next->u.c.component->name, "_data") == 0
233 && ref->next->next == NULL)))
241 /* Build a NULL initializer for CLASS pointers,
242 initializing the _data component to NULL and
243 the _vptr component to the declared type. */
246 gfc_class_null_initializer (gfc_typespec *ts)
251 init = gfc_get_structure_constructor_expr (ts->type, ts->kind,
252 &ts->u.derived->declared_at);
255 for (comp = ts->u.derived->components; comp; comp = comp->next)
257 gfc_constructor *ctor = gfc_constructor_get();
258 if (strcmp (comp->name, "_vptr") == 0)
259 ctor->expr = gfc_lval_expr_from_sym (gfc_find_derived_vtab (ts->u.derived));
261 ctor->expr = gfc_get_null_expr (NULL);
262 gfc_constructor_append (&init->value.constructor, ctor);
269 /* Create a unique string identifier for a derived type, composed of its name
270 and module name. This is used to construct unique names for the class
271 containers and vtab symbols. */
274 get_unique_type_string (char *string, gfc_symbol *derived)
276 char dt_name[GFC_MAX_SYMBOL_LEN+1];
277 sprintf (dt_name, "%s", derived->name);
278 dt_name[0] = TOUPPER (dt_name[0]);
280 sprintf (string, "%s_%s", derived->module, dt_name);
281 else if (derived->ns->proc_name)
282 sprintf (string, "%s_%s", derived->ns->proc_name->name, dt_name);
284 sprintf (string, "_%s", dt_name);
288 /* A relative of 'get_unique_type_string' which makes sure the generated
289 string will not be too long (replacing it by a hash string if needed). */
292 get_unique_hashed_string (char *string, gfc_symbol *derived)
294 char tmp[2*GFC_MAX_SYMBOL_LEN+2];
295 get_unique_type_string (&tmp[0], derived);
296 /* If string is too long, use hash value in hex representation (allow for
297 extra decoration, cf. gfc_build_class_symbol & gfc_find_derived_vtab). */
298 if (strlen (tmp) > GFC_MAX_SYMBOL_LEN - 11)
300 int h = gfc_hash_value (derived);
301 sprintf (string, "%X", h);
304 strcpy (string, tmp);
308 /* Assign a hash value for a derived type. The algorithm is that of SDBM. */
311 gfc_hash_value (gfc_symbol *sym)
313 unsigned int hash = 0;
314 char c[2*(GFC_MAX_SYMBOL_LEN+1)];
317 get_unique_type_string (&c[0], sym);
320 for (i = 0; i < len; i++)
321 hash = (hash << 6) + (hash << 16) - hash + c[i];
323 /* Return the hash but take the modulus for the sake of module read,
324 even though this slightly increases the chance of collision. */
325 return (hash % 100000000);
329 /* Build a polymorphic CLASS entity, using the symbol that comes from
330 build_sym. A CLASS entity is represented by an encapsulating type,
331 which contains the declared type as '_data' component, plus a pointer
332 component '_vptr' which determines the dynamic type. */
335 gfc_build_class_symbol (gfc_typespec *ts, symbol_attribute *attr,
336 gfc_array_spec **as, bool delayed_vtab)
338 char name[GFC_MAX_SYMBOL_LEN+1], tname[GFC_MAX_SYMBOL_LEN+1];
343 if (as && *as && (*as)->type == AS_ASSUMED_SIZE)
345 gfc_error ("Assumed size polymorphic objects or components, such "
346 "as that at %C, have not yet been implemented");
351 /* Class container has already been built. */
354 attr->class_ok = attr->dummy || attr->pointer || attr->allocatable
355 || attr->select_type_temporary;
358 /* We can not build the class container yet. */
361 /* Determine the name of the encapsulating type. */
362 get_unique_hashed_string (tname, ts->u.derived);
363 if ((*as) && (*as)->rank && attr->allocatable)
364 sprintf (name, "__class_%s_%d_a", tname, (*as)->rank);
365 else if ((*as) && (*as)->rank)
366 sprintf (name, "__class_%s_%d", tname, (*as)->rank);
367 else if (attr->pointer)
368 sprintf (name, "__class_%s_p", tname);
369 else if (attr->allocatable)
370 sprintf (name, "__class_%s_a", tname);
372 sprintf (name, "__class_%s", tname);
374 gfc_find_symbol (name, ts->u.derived->ns, 0, &fclass);
378 /* If not there, create a new symbol. */
379 fclass = gfc_new_symbol (name, ts->u.derived->ns);
380 st = gfc_new_symtree (&ts->u.derived->ns->sym_root, name);
382 gfc_set_sym_referenced (fclass);
384 fclass->ts.type = BT_UNKNOWN;
385 fclass->attr.abstract = ts->u.derived->attr.abstract;
386 if (ts->u.derived->f2k_derived)
387 fclass->f2k_derived = gfc_get_namespace (NULL, 0);
388 if (gfc_add_flavor (&fclass->attr, FL_DERIVED,
389 NULL, &gfc_current_locus) == FAILURE)
392 /* Add component '_data'. */
393 if (gfc_add_component (fclass, "_data", &c) == FAILURE)
396 c->ts.type = BT_DERIVED;
397 c->attr.access = ACCESS_PRIVATE;
398 c->ts.u.derived = ts->u.derived;
399 c->attr.class_pointer = attr->pointer;
400 c->attr.pointer = attr->pointer || (attr->dummy && !attr->allocatable)
401 || attr->select_type_temporary;
402 c->attr.allocatable = attr->allocatable;
403 c->attr.dimension = attr->dimension;
404 c->attr.codimension = attr->codimension;
405 c->attr.abstract = ts->u.derived->attr.abstract;
407 c->initializer = NULL;
409 /* Add component '_vptr'. */
410 if (gfc_add_component (fclass, "_vptr", &c) == FAILURE)
412 c->ts.type = BT_DERIVED;
414 c->ts.u.derived = NULL;
417 vtab = gfc_find_derived_vtab (ts->u.derived);
419 c->ts.u.derived = vtab->ts.u.derived;
421 c->attr.access = ACCESS_PRIVATE;
425 /* Since the extension field is 8 bit wide, we can only have
426 up to 255 extension levels. */
427 if (ts->u.derived->attr.extension == 255)
429 gfc_error ("Maximum extension level reached with type '%s' at %L",
430 ts->u.derived->name, &ts->u.derived->declared_at);
434 fclass->attr.extension = ts->u.derived->attr.extension + 1;
435 fclass->attr.is_class = 1;
436 ts->u.derived = fclass;
437 attr->allocatable = attr->pointer = attr->dimension = attr->codimension = 0;
443 /* Add a procedure pointer component to the vtype
444 to represent a specific type-bound procedure. */
447 add_proc_comp (gfc_symbol *vtype, const char *name, gfc_typebound_proc *tb)
451 if (tb->non_overridable)
454 c = gfc_find_component (vtype, name, true, true);
458 /* Add procedure component. */
459 if (gfc_add_component (vtype, name, &c) == FAILURE)
463 c->tb = XCNEW (gfc_typebound_proc);
466 c->attr.procedure = 1;
467 c->attr.proc_pointer = 1;
468 c->attr.flavor = FL_PROCEDURE;
469 c->attr.access = ACCESS_PRIVATE;
470 c->attr.external = 1;
472 c->attr.if_source = IFSRC_IFBODY;
474 else if (c->attr.proc_pointer && c->tb)
482 c->ts.interface = tb->u.specific->n.sym;
484 c->initializer = gfc_get_variable_expr (tb->u.specific);
489 /* Add all specific type-bound procedures in the symtree 'st' to a vtype. */
492 add_procs_to_declared_vtab1 (gfc_symtree *st, gfc_symbol *vtype)
498 add_procs_to_declared_vtab1 (st->left, vtype);
501 add_procs_to_declared_vtab1 (st->right, vtype);
503 if (st->n.tb && !st->n.tb->error
504 && !st->n.tb->is_generic && st->n.tb->u.specific)
505 add_proc_comp (vtype, st->name, st->n.tb);
509 /* Copy procedure pointers components from the parent type. */
512 copy_vtab_proc_comps (gfc_symbol *declared, gfc_symbol *vtype)
517 vtab = gfc_find_derived_vtab (declared);
519 for (cmp = vtab->ts.u.derived->components; cmp; cmp = cmp->next)
521 if (gfc_find_component (vtype, cmp->name, true, true))
524 add_proc_comp (vtype, cmp->name, cmp->tb);
529 /* Add procedure pointers for all type-bound procedures to a vtab. */
532 add_procs_to_declared_vtab (gfc_symbol *derived, gfc_symbol *vtype)
534 gfc_symbol* super_type;
536 super_type = gfc_get_derived_super_type (derived);
538 if (super_type && (super_type != derived))
540 /* Make sure that the PPCs appear in the same order as in the parent. */
541 copy_vtab_proc_comps (super_type, vtype);
542 /* Only needed to get the PPC initializers right. */
543 add_procs_to_declared_vtab (super_type, vtype);
546 if (derived->f2k_derived && derived->f2k_derived->tb_sym_root)
547 add_procs_to_declared_vtab1 (derived->f2k_derived->tb_sym_root, vtype);
549 if (derived->f2k_derived && derived->f2k_derived->tb_uop_root)
550 add_procs_to_declared_vtab1 (derived->f2k_derived->tb_uop_root, vtype);
554 /* Find (or generate) the symbol for a derived type's vtab. */
557 gfc_find_derived_vtab (gfc_symbol *derived)
560 gfc_symbol *vtab = NULL, *vtype = NULL, *found_sym = NULL, *def_init = NULL;
561 gfc_symbol *copy = NULL, *src = NULL, *dst = NULL;
563 /* Find the top-level namespace (MODULE or PROGRAM). */
564 for (ns = gfc_current_ns; ns; ns = ns->parent)
568 /* If the type is a class container, use the underlying derived type. */
569 if (derived->attr.is_class)
570 derived = gfc_get_derived_super_type (derived);
574 char name[GFC_MAX_SYMBOL_LEN+1], tname[GFC_MAX_SYMBOL_LEN+1];
576 get_unique_hashed_string (tname, derived);
577 sprintf (name, "__vtab_%s", tname);
579 /* Look for the vtab symbol in various namespaces. */
580 gfc_find_symbol (name, gfc_current_ns, 0, &vtab);
582 gfc_find_symbol (name, ns, 0, &vtab);
584 gfc_find_symbol (name, derived->ns, 0, &vtab);
588 gfc_get_symbol (name, ns, &vtab);
589 vtab->ts.type = BT_DERIVED;
590 if (gfc_add_flavor (&vtab->attr, FL_PARAMETER, NULL,
591 &gfc_current_locus) == FAILURE)
593 vtab->attr.target = 1;
594 vtab->attr.save = SAVE_IMPLICIT;
596 vtab->attr.access = ACCESS_PUBLIC;
597 gfc_set_sym_referenced (vtab);
598 sprintf (name, "__vtype_%s", tname);
600 gfc_find_symbol (name, ns, 0, &vtype);
604 gfc_symbol *parent = NULL, *parent_vtab = NULL;
606 gfc_get_symbol (name, ns, &vtype);
607 if (gfc_add_flavor (&vtype->attr, FL_DERIVED,
608 NULL, &gfc_current_locus) == FAILURE)
610 vtype->attr.access = ACCESS_PUBLIC;
611 vtype->attr.vtype = 1;
612 gfc_set_sym_referenced (vtype);
614 /* Add component '_hash'. */
615 if (gfc_add_component (vtype, "_hash", &c) == FAILURE)
617 c->ts.type = BT_INTEGER;
619 c->attr.access = ACCESS_PRIVATE;
620 c->initializer = gfc_get_int_expr (gfc_default_integer_kind,
621 NULL, derived->hash_value);
623 /* Add component '_size'. */
624 if (gfc_add_component (vtype, "_size", &c) == FAILURE)
626 c->ts.type = BT_INTEGER;
628 c->attr.access = ACCESS_PRIVATE;
629 /* Remember the derived type in ts.u.derived,
630 so that the correct initializer can be set later on
631 (in gfc_conv_structure). */
632 c->ts.u.derived = derived;
633 c->initializer = gfc_get_int_expr (gfc_default_integer_kind,
636 /* Add component _extends. */
637 if (gfc_add_component (vtype, "_extends", &c) == FAILURE)
640 c->attr.access = ACCESS_PRIVATE;
641 parent = gfc_get_derived_super_type (derived);
644 parent_vtab = gfc_find_derived_vtab (parent);
645 c->ts.type = BT_DERIVED;
646 c->ts.u.derived = parent_vtab->ts.u.derived;
647 c->initializer = gfc_get_expr ();
648 c->initializer->expr_type = EXPR_VARIABLE;
649 gfc_find_sym_tree (parent_vtab->name, parent_vtab->ns,
650 0, &c->initializer->symtree);
654 c->ts.type = BT_DERIVED;
655 c->ts.u.derived = vtype;
656 c->initializer = gfc_get_null_expr (NULL);
659 if (derived->components == NULL && !derived->attr.zero_comp)
661 /* At this point an error must have occurred.
662 Prevent further errors on the vtype components. */
667 /* Add component _def_init. */
668 if (gfc_add_component (vtype, "_def_init", &c) == FAILURE)
671 c->attr.access = ACCESS_PRIVATE;
672 c->ts.type = BT_DERIVED;
673 c->ts.u.derived = derived;
674 if (derived->attr.abstract)
675 c->initializer = gfc_get_null_expr (NULL);
678 /* Construct default initialization variable. */
679 sprintf (name, "__def_init_%s", tname);
680 gfc_get_symbol (name, ns, &def_init);
681 def_init->attr.target = 1;
682 def_init->attr.save = SAVE_IMPLICIT;
683 def_init->attr.access = ACCESS_PUBLIC;
684 def_init->attr.flavor = FL_PARAMETER;
685 gfc_set_sym_referenced (def_init);
686 def_init->ts.type = BT_DERIVED;
687 def_init->ts.u.derived = derived;
688 def_init->value = gfc_default_initializer (&def_init->ts);
690 c->initializer = gfc_lval_expr_from_sym (def_init);
693 /* Add component _copy. */
694 if (gfc_add_component (vtype, "_copy", &c) == FAILURE)
696 c->attr.proc_pointer = 1;
697 c->attr.access = ACCESS_PRIVATE;
698 c->tb = XCNEW (gfc_typebound_proc);
700 if (derived->attr.abstract)
701 c->initializer = gfc_get_null_expr (NULL);
704 /* Set up namespace. */
705 gfc_namespace *sub_ns = gfc_get_namespace (ns, 0);
706 sub_ns->sibling = ns->contained;
707 ns->contained = sub_ns;
708 sub_ns->resolved = 1;
709 /* Set up procedure symbol. */
710 sprintf (name, "__copy_%s", tname);
711 gfc_get_symbol (name, sub_ns, ©);
712 sub_ns->proc_name = copy;
713 copy->attr.flavor = FL_PROCEDURE;
714 copy->attr.subroutine = 1;
715 copy->attr.if_source = IFSRC_DECL;
716 /* This is elemental so that arrays are automatically
717 treated correctly by the scalarizer. */
718 copy->attr.elemental = 1;
719 if (ns->proc_name->attr.flavor == FL_MODULE)
720 copy->module = ns->proc_name->name;
721 gfc_set_sym_referenced (copy);
722 /* Set up formal arguments. */
723 gfc_get_symbol ("src", sub_ns, &src);
724 src->ts.type = BT_DERIVED;
725 src->ts.u.derived = derived;
726 src->attr.flavor = FL_VARIABLE;
728 src->attr.intent = INTENT_IN;
729 gfc_set_sym_referenced (src);
730 copy->formal = gfc_get_formal_arglist ();
731 copy->formal->sym = src;
732 gfc_get_symbol ("dst", sub_ns, &dst);
733 dst->ts.type = BT_DERIVED;
734 dst->ts.u.derived = derived;
735 dst->attr.flavor = FL_VARIABLE;
737 dst->attr.intent = INTENT_OUT;
738 gfc_set_sym_referenced (dst);
739 copy->formal->next = gfc_get_formal_arglist ();
740 copy->formal->next->sym = dst;
742 sub_ns->code = gfc_get_code ();
743 sub_ns->code->op = EXEC_INIT_ASSIGN;
744 sub_ns->code->expr1 = gfc_lval_expr_from_sym (dst);
745 sub_ns->code->expr2 = gfc_lval_expr_from_sym (src);
746 /* Set initializer. */
747 c->initializer = gfc_lval_expr_from_sym (copy);
748 c->ts.interface = copy;
751 /* Add procedure pointers for type-bound procedures. */
752 add_procs_to_declared_vtab (derived, vtype);
756 vtab->ts.u.derived = vtype;
757 vtab->value = gfc_default_initializer (&vtab->ts);
764 /* It is unexpected to have some symbols added at resolution or code
765 generation time. We commit the changes in order to keep a clean state. */
768 gfc_commit_symbol (vtab);
770 gfc_commit_symbol (vtype);
772 gfc_commit_symbol (def_init);
774 gfc_commit_symbol (copy);
776 gfc_commit_symbol (src);
778 gfc_commit_symbol (dst);
787 /* General worker function to find either a type-bound procedure or a
788 type-bound user operator. */
791 find_typebound_proc_uop (gfc_symbol* derived, gfc_try* t,
792 const char* name, bool noaccess, bool uop,
798 /* Set correct symbol-root. */
799 gcc_assert (derived->f2k_derived);
800 root = (uop ? derived->f2k_derived->tb_uop_root
801 : derived->f2k_derived->tb_sym_root);
803 /* Set default to failure. */
807 /* Try to find it in the current type's namespace. */
808 res = gfc_find_symtree (root, name);
809 if (res && res->n.tb && !res->n.tb->error)
815 if (!noaccess && derived->attr.use_assoc
816 && res->n.tb->access == ACCESS_PRIVATE)
819 gfc_error ("'%s' of '%s' is PRIVATE at %L",
820 name, derived->name, where);
828 /* Otherwise, recurse on parent type if derived is an extension. */
829 if (derived->attr.extension)
831 gfc_symbol* super_type;
832 super_type = gfc_get_derived_super_type (derived);
833 gcc_assert (super_type);
835 return find_typebound_proc_uop (super_type, t, name,
836 noaccess, uop, where);
844 /* Find a type-bound procedure or user operator by name for a derived-type
845 (looking recursively through the super-types). */
848 gfc_find_typebound_proc (gfc_symbol* derived, gfc_try* t,
849 const char* name, bool noaccess, locus* where)
851 return find_typebound_proc_uop (derived, t, name, noaccess, false, where);
855 gfc_find_typebound_user_op (gfc_symbol* derived, gfc_try* t,
856 const char* name, bool noaccess, locus* where)
858 return find_typebound_proc_uop (derived, t, name, noaccess, true, where);
862 /* Find a type-bound intrinsic operator looking recursively through the
863 super-type hierarchy. */
866 gfc_find_typebound_intrinsic_op (gfc_symbol* derived, gfc_try* t,
867 gfc_intrinsic_op op, bool noaccess,
870 gfc_typebound_proc* res;
872 /* Set default to failure. */
876 /* Try to find it in the current type's namespace. */
877 if (derived->f2k_derived)
878 res = derived->f2k_derived->tb_op[op];
883 if (res && !res->error)
889 if (!noaccess && derived->attr.use_assoc
890 && res->access == ACCESS_PRIVATE)
893 gfc_error ("'%s' of '%s' is PRIVATE at %L",
894 gfc_op2string (op), derived->name, where);
902 /* Otherwise, recurse on parent type if derived is an extension. */
903 if (derived->attr.extension)
905 gfc_symbol* super_type;
906 super_type = gfc_get_derived_super_type (derived);
907 gcc_assert (super_type);
909 return gfc_find_typebound_intrinsic_op (super_type, t, op,
918 /* Get a typebound-procedure symtree or create and insert it if not yet
919 present. This is like a very simplified version of gfc_get_sym_tree for
920 tbp-symtrees rather than regular ones. */
923 gfc_get_tbp_symtree (gfc_symtree **root, const char *name)
927 result = gfc_find_symtree (*root, name);
930 result = gfc_new_symtree (root, name);