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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
)
67 derived
= (*tail
)->u
.c
.component
->ts
.u
.derived
;
68 if ((*tail
)->type
== REF_ARRAY
&& (*tail
)->next
== NULL
)
70 tail
= &((*tail
)->next
);
72 if (*tail
!= NULL
&& strcmp (name
, "_data") == 0)
74 (*tail
) = gfc_get_ref();
76 (*tail
)->type
= REF_COMPONENT
;
77 (*tail
)->u
.c
.sym
= derived
;
78 (*tail
)->u
.c
.component
= gfc_find_component (derived
, name
, true, true);
79 gcc_assert((*tail
)->u
.c
.component
);
81 e
->ts
= (*tail
)->u
.c
.component
->ts
;
85 /* Build a NULL initializer for CLASS pointers,
86 initializing the _data component to NULL and
87 the _vptr component to the declared type. */
90 gfc_class_null_initializer (gfc_typespec
*ts
)
95 init
= gfc_get_structure_constructor_expr (ts
->type
, ts
->kind
,
96 &ts
->u
.derived
->declared_at
);
99 for (comp
= ts
->u
.derived
->components
; comp
; comp
= comp
->next
)
101 gfc_constructor
*ctor
= gfc_constructor_get();
102 if (strcmp (comp
->name
, "_vptr") == 0)
103 ctor
->expr
= gfc_lval_expr_from_sym (gfc_find_derived_vtab (ts
->u
.derived
));
105 ctor
->expr
= gfc_get_null_expr (NULL
);
106 gfc_constructor_append (&init
->value
.constructor
, ctor
);
113 /* Create a unique string identifier for a derived type, composed of its name
114 and module name. This is used to construct unique names for the class
115 containers and vtab symbols. */
118 get_unique_type_string (char *string
, gfc_symbol
*derived
)
120 char dt_name
[GFC_MAX_SYMBOL_LEN
+1];
121 sprintf (dt_name
, "%s", derived
->name
);
122 dt_name
[0] = TOUPPER (dt_name
[0]);
124 sprintf (string
, "%s_%s", derived
->module
, dt_name
);
125 else if (derived
->ns
->proc_name
)
126 sprintf (string
, "%s_%s", derived
->ns
->proc_name
->name
, dt_name
);
128 sprintf (string
, "_%s", dt_name
);
132 /* A relative of 'get_unique_type_string' which makes sure the generated
133 string will not be too long (replacing it by a hash string if needed). */
136 get_unique_hashed_string (char *string
, gfc_symbol
*derived
)
138 char tmp
[2*GFC_MAX_SYMBOL_LEN
+2];
139 get_unique_type_string (&tmp
[0], derived
);
140 /* If string is too long, use hash value in hex representation (allow for
141 extra decoration, cf. gfc_build_class_symbol & gfc_find_derived_vtab). */
142 if (strlen (tmp
) > GFC_MAX_SYMBOL_LEN
- 11)
144 int h
= gfc_hash_value (derived
);
145 sprintf (string
, "%X", h
);
148 strcpy (string
, tmp
);
152 /* Assign a hash value for a derived type. The algorithm is that of SDBM. */
155 gfc_hash_value (gfc_symbol
*sym
)
157 unsigned int hash
= 0;
158 char c
[2*(GFC_MAX_SYMBOL_LEN
+1)];
161 get_unique_type_string (&c
[0], sym
);
164 for (i
= 0; i
< len
; i
++)
165 hash
= (hash
<< 6) + (hash
<< 16) - hash
+ c
[i
];
167 /* Return the hash but take the modulus for the sake of module read,
168 even though this slightly increases the chance of collision. */
169 return (hash
% 100000000);
173 /* Build a polymorphic CLASS entity, using the symbol that comes from
174 build_sym. A CLASS entity is represented by an encapsulating type,
175 which contains the declared type as '_data' component, plus a pointer
176 component '_vptr' which determines the dynamic type. */
179 gfc_build_class_symbol (gfc_typespec
*ts
, symbol_attribute
*attr
,
180 gfc_array_spec
**as
, bool delayed_vtab
)
182 char name
[GFC_MAX_SYMBOL_LEN
+1], tname
[GFC_MAX_SYMBOL_LEN
+1];
188 /* Class container has already been built. */
191 attr
->class_ok
= attr
->dummy
|| attr
->pointer
|| attr
->allocatable
192 || attr
->select_type_temporary
;
195 /* We can not build the class container yet. */
200 gfc_fatal_error ("Polymorphic array at %C not yet supported");
204 /* Determine the name of the encapsulating type. */
205 get_unique_hashed_string (tname
, ts
->u
.derived
);
206 if ((*as
) && (*as
)->rank
&& attr
->allocatable
)
207 sprintf (name
, "__class_%s_%d_a", tname
, (*as
)->rank
);
208 else if ((*as
) && (*as
)->rank
)
209 sprintf (name
, "__class_%s_%d", tname
, (*as
)->rank
);
210 else if (attr
->pointer
)
211 sprintf (name
, "__class_%s_p", tname
);
212 else if (attr
->allocatable
)
213 sprintf (name
, "__class_%s_a", tname
);
215 sprintf (name
, "__class_%s", tname
);
217 gfc_find_symbol (name
, ts
->u
.derived
->ns
, 0, &fclass
);
221 /* If not there, create a new symbol. */
222 fclass
= gfc_new_symbol (name
, ts
->u
.derived
->ns
);
223 st
= gfc_new_symtree (&ts
->u
.derived
->ns
->sym_root
, name
);
225 gfc_set_sym_referenced (fclass
);
227 fclass
->ts
.type
= BT_UNKNOWN
;
228 fclass
->attr
.abstract
= ts
->u
.derived
->attr
.abstract
;
229 if (ts
->u
.derived
->f2k_derived
)
230 fclass
->f2k_derived
= gfc_get_namespace (NULL
, 0);
231 if (gfc_add_flavor (&fclass
->attr
, FL_DERIVED
,
232 NULL
, &gfc_current_locus
) == FAILURE
)
235 /* Add component '_data'. */
236 if (gfc_add_component (fclass
, "_data", &c
) == FAILURE
)
239 c
->ts
.type
= BT_DERIVED
;
240 c
->attr
.access
= ACCESS_PRIVATE
;
241 c
->ts
.u
.derived
= ts
->u
.derived
;
242 c
->attr
.class_pointer
= attr
->pointer
;
243 c
->attr
.pointer
= attr
->pointer
|| (attr
->dummy
&& !attr
->allocatable
)
244 || attr
->select_type_temporary
;
245 c
->attr
.allocatable
= attr
->allocatable
;
246 c
->attr
.dimension
= attr
->dimension
;
247 c
->attr
.codimension
= attr
->codimension
;
248 c
->attr
.abstract
= ts
->u
.derived
->attr
.abstract
;
250 c
->initializer
= NULL
;
252 /* Add component '_vptr'. */
253 if (gfc_add_component (fclass
, "_vptr", &c
) == FAILURE
)
255 c
->ts
.type
= BT_DERIVED
;
257 c
->ts
.u
.derived
= NULL
;
260 vtab
= gfc_find_derived_vtab (ts
->u
.derived
);
262 c
->ts
.u
.derived
= vtab
->ts
.u
.derived
;
264 c
->attr
.access
= ACCESS_PRIVATE
;
268 /* Since the extension field is 8 bit wide, we can only have
269 up to 255 extension levels. */
270 if (ts
->u
.derived
->attr
.extension
== 255)
272 gfc_error ("Maximum extension level reached with type '%s' at %L",
273 ts
->u
.derived
->name
, &ts
->u
.derived
->declared_at
);
277 fclass
->attr
.extension
= ts
->u
.derived
->attr
.extension
+ 1;
278 fclass
->attr
.is_class
= 1;
279 ts
->u
.derived
= fclass
;
280 attr
->allocatable
= attr
->pointer
= attr
->dimension
= 0;
281 (*as
) = NULL
; /* XXX */
286 /* Add a procedure pointer component to the vtype
287 to represent a specific type-bound procedure. */
290 add_proc_comp (gfc_symbol
*vtype
, const char *name
, gfc_typebound_proc
*tb
)
294 if (tb
->non_overridable
)
297 c
= gfc_find_component (vtype
, name
, true, true);
301 /* Add procedure component. */
302 if (gfc_add_component (vtype
, name
, &c
) == FAILURE
)
306 c
->tb
= XCNEW (gfc_typebound_proc
);
309 c
->attr
.procedure
= 1;
310 c
->attr
.proc_pointer
= 1;
311 c
->attr
.flavor
= FL_PROCEDURE
;
312 c
->attr
.access
= ACCESS_PRIVATE
;
313 c
->attr
.external
= 1;
315 c
->attr
.if_source
= IFSRC_IFBODY
;
317 else if (c
->attr
.proc_pointer
&& c
->tb
)
325 c
->ts
.interface
= tb
->u
.specific
->n
.sym
;
327 c
->initializer
= gfc_get_variable_expr (tb
->u
.specific
);
332 /* Add all specific type-bound procedures in the symtree 'st' to a vtype. */
335 add_procs_to_declared_vtab1 (gfc_symtree
*st
, gfc_symbol
*vtype
)
341 add_procs_to_declared_vtab1 (st
->left
, vtype
);
344 add_procs_to_declared_vtab1 (st
->right
, vtype
);
346 if (st
->n
.tb
&& !st
->n
.tb
->error
347 && !st
->n
.tb
->is_generic
&& st
->n
.tb
->u
.specific
)
348 add_proc_comp (vtype
, st
->name
, st
->n
.tb
);
352 /* Copy procedure pointers components from the parent type. */
355 copy_vtab_proc_comps (gfc_symbol
*declared
, gfc_symbol
*vtype
)
360 vtab
= gfc_find_derived_vtab (declared
);
362 for (cmp
= vtab
->ts
.u
.derived
->components
; cmp
; cmp
= cmp
->next
)
364 if (gfc_find_component (vtype
, cmp
->name
, true, true))
367 add_proc_comp (vtype
, cmp
->name
, cmp
->tb
);
372 /* Add procedure pointers for all type-bound procedures to a vtab. */
375 add_procs_to_declared_vtab (gfc_symbol
*derived
, gfc_symbol
*vtype
)
377 gfc_symbol
* super_type
;
379 super_type
= gfc_get_derived_super_type (derived
);
381 if (super_type
&& (super_type
!= derived
))
383 /* Make sure that the PPCs appear in the same order as in the parent. */
384 copy_vtab_proc_comps (super_type
, vtype
);
385 /* Only needed to get the PPC initializers right. */
386 add_procs_to_declared_vtab (super_type
, vtype
);
389 if (derived
->f2k_derived
&& derived
->f2k_derived
->tb_sym_root
)
390 add_procs_to_declared_vtab1 (derived
->f2k_derived
->tb_sym_root
, vtype
);
392 if (derived
->f2k_derived
&& derived
->f2k_derived
->tb_uop_root
)
393 add_procs_to_declared_vtab1 (derived
->f2k_derived
->tb_uop_root
, vtype
);
397 /* Find (or generate) the symbol for a derived type's vtab. */
400 gfc_find_derived_vtab (gfc_symbol
*derived
)
403 gfc_symbol
*vtab
= NULL
, *vtype
= NULL
, *found_sym
= NULL
, *def_init
= NULL
;
404 gfc_symbol
*copy
= NULL
, *src
= NULL
, *dst
= NULL
;
406 /* Find the top-level namespace (MODULE or PROGRAM). */
407 for (ns
= gfc_current_ns
; ns
; ns
= ns
->parent
)
411 /* If the type is a class container, use the underlying derived type. */
412 if (derived
->attr
.is_class
)
413 derived
= gfc_get_derived_super_type (derived
);
417 char name
[GFC_MAX_SYMBOL_LEN
+1], tname
[GFC_MAX_SYMBOL_LEN
+1];
419 get_unique_hashed_string (tname
, derived
);
420 sprintf (name
, "__vtab_%s", tname
);
422 /* Look for the vtab symbol in various namespaces. */
423 gfc_find_symbol (name
, gfc_current_ns
, 0, &vtab
);
425 gfc_find_symbol (name
, ns
, 0, &vtab
);
427 gfc_find_symbol (name
, derived
->ns
, 0, &vtab
);
431 gfc_get_symbol (name
, ns
, &vtab
);
432 vtab
->ts
.type
= BT_DERIVED
;
433 if (gfc_add_flavor (&vtab
->attr
, FL_PARAMETER
, NULL
,
434 &gfc_current_locus
) == FAILURE
)
436 vtab
->attr
.target
= 1;
437 vtab
->attr
.save
= SAVE_IMPLICIT
;
439 vtab
->attr
.access
= ACCESS_PUBLIC
;
440 gfc_set_sym_referenced (vtab
);
441 sprintf (name
, "__vtype_%s", tname
);
443 gfc_find_symbol (name
, ns
, 0, &vtype
);
447 gfc_symbol
*parent
= NULL
, *parent_vtab
= NULL
;
449 gfc_get_symbol (name
, ns
, &vtype
);
450 if (gfc_add_flavor (&vtype
->attr
, FL_DERIVED
,
451 NULL
, &gfc_current_locus
) == FAILURE
)
453 vtype
->attr
.access
= ACCESS_PUBLIC
;
454 vtype
->attr
.vtype
= 1;
455 gfc_set_sym_referenced (vtype
);
457 /* Add component '_hash'. */
458 if (gfc_add_component (vtype
, "_hash", &c
) == FAILURE
)
460 c
->ts
.type
= BT_INTEGER
;
462 c
->attr
.access
= ACCESS_PRIVATE
;
463 c
->initializer
= gfc_get_int_expr (gfc_default_integer_kind
,
464 NULL
, derived
->hash_value
);
466 /* Add component '_size'. */
467 if (gfc_add_component (vtype
, "_size", &c
) == FAILURE
)
469 c
->ts
.type
= BT_INTEGER
;
471 c
->attr
.access
= ACCESS_PRIVATE
;
472 /* Remember the derived type in ts.u.derived,
473 so that the correct initializer can be set later on
474 (in gfc_conv_structure). */
475 c
->ts
.u
.derived
= derived
;
476 c
->initializer
= gfc_get_int_expr (gfc_default_integer_kind
,
479 /* Add component _extends. */
480 if (gfc_add_component (vtype
, "_extends", &c
) == FAILURE
)
483 c
->attr
.access
= ACCESS_PRIVATE
;
484 parent
= gfc_get_derived_super_type (derived
);
487 parent_vtab
= gfc_find_derived_vtab (parent
);
488 c
->ts
.type
= BT_DERIVED
;
489 c
->ts
.u
.derived
= parent_vtab
->ts
.u
.derived
;
490 c
->initializer
= gfc_get_expr ();
491 c
->initializer
->expr_type
= EXPR_VARIABLE
;
492 gfc_find_sym_tree (parent_vtab
->name
, parent_vtab
->ns
,
493 0, &c
->initializer
->symtree
);
497 c
->ts
.type
= BT_DERIVED
;
498 c
->ts
.u
.derived
= vtype
;
499 c
->initializer
= gfc_get_null_expr (NULL
);
502 if (derived
->components
== NULL
&& !derived
->attr
.zero_comp
)
504 /* At this point an error must have occurred.
505 Prevent further errors on the vtype components. */
510 /* Add component _def_init. */
511 if (gfc_add_component (vtype
, "_def_init", &c
) == FAILURE
)
514 c
->attr
.access
= ACCESS_PRIVATE
;
515 c
->ts
.type
= BT_DERIVED
;
516 c
->ts
.u
.derived
= derived
;
517 if (derived
->attr
.abstract
)
518 c
->initializer
= gfc_get_null_expr (NULL
);
521 /* Construct default initialization variable. */
522 sprintf (name
, "__def_init_%s", tname
);
523 gfc_get_symbol (name
, ns
, &def_init
);
524 def_init
->attr
.target
= 1;
525 def_init
->attr
.save
= SAVE_IMPLICIT
;
526 def_init
->attr
.access
= ACCESS_PUBLIC
;
527 def_init
->attr
.flavor
= FL_PARAMETER
;
528 gfc_set_sym_referenced (def_init
);
529 def_init
->ts
.type
= BT_DERIVED
;
530 def_init
->ts
.u
.derived
= derived
;
531 def_init
->value
= gfc_default_initializer (&def_init
->ts
);
533 c
->initializer
= gfc_lval_expr_from_sym (def_init
);
536 /* Add component _copy. */
537 if (gfc_add_component (vtype
, "_copy", &c
) == FAILURE
)
539 c
->attr
.proc_pointer
= 1;
540 c
->attr
.access
= ACCESS_PRIVATE
;
541 c
->tb
= XCNEW (gfc_typebound_proc
);
543 if (derived
->attr
.abstract
)
544 c
->initializer
= gfc_get_null_expr (NULL
);
547 /* Set up namespace. */
548 gfc_namespace
*sub_ns
= gfc_get_namespace (ns
, 0);
549 sub_ns
->sibling
= ns
->contained
;
550 ns
->contained
= sub_ns
;
551 sub_ns
->resolved
= 1;
552 /* Set up procedure symbol. */
553 sprintf (name
, "__copy_%s", tname
);
554 gfc_get_symbol (name
, sub_ns
, ©
);
555 sub_ns
->proc_name
= copy
;
556 copy
->attr
.flavor
= FL_PROCEDURE
;
557 copy
->attr
.subroutine
= 1;
558 copy
->attr
.if_source
= IFSRC_DECL
;
559 if (ns
->proc_name
->attr
.flavor
== FL_MODULE
)
560 copy
->module
= ns
->proc_name
->name
;
561 gfc_set_sym_referenced (copy
);
562 /* Set up formal arguments. */
563 gfc_get_symbol ("src", sub_ns
, &src
);
564 src
->ts
.type
= BT_DERIVED
;
565 src
->ts
.u
.derived
= derived
;
566 src
->attr
.flavor
= FL_VARIABLE
;
568 gfc_set_sym_referenced (src
);
569 copy
->formal
= gfc_get_formal_arglist ();
570 copy
->formal
->sym
= src
;
571 gfc_get_symbol ("dst", sub_ns
, &dst
);
572 dst
->ts
.type
= BT_DERIVED
;
573 dst
->ts
.u
.derived
= derived
;
574 dst
->attr
.flavor
= FL_VARIABLE
;
576 gfc_set_sym_referenced (dst
);
577 copy
->formal
->next
= gfc_get_formal_arglist ();
578 copy
->formal
->next
->sym
= dst
;
580 sub_ns
->code
= gfc_get_code ();
581 sub_ns
->code
->op
= EXEC_INIT_ASSIGN
;
582 sub_ns
->code
->expr1
= gfc_lval_expr_from_sym (dst
);
583 sub_ns
->code
->expr2
= gfc_lval_expr_from_sym (src
);
584 /* Set initializer. */
585 c
->initializer
= gfc_lval_expr_from_sym (copy
);
586 c
->ts
.interface
= copy
;
589 /* Add procedure pointers for type-bound procedures. */
590 add_procs_to_declared_vtab (derived
, vtype
);
594 vtab
->ts
.u
.derived
= vtype
;
595 vtab
->value
= gfc_default_initializer (&vtab
->ts
);
602 /* It is unexpected to have some symbols added at resolution or code
603 generation time. We commit the changes in order to keep a clean state. */
606 gfc_commit_symbol (vtab
);
608 gfc_commit_symbol (vtype
);
610 gfc_commit_symbol (def_init
);
612 gfc_commit_symbol (copy
);
614 gfc_commit_symbol (src
);
616 gfc_commit_symbol (dst
);
625 /* General worker function to find either a type-bound procedure or a
626 type-bound user operator. */
629 find_typebound_proc_uop (gfc_symbol
* derived
, gfc_try
* t
,
630 const char* name
, bool noaccess
, bool uop
,
636 /* Set correct symbol-root. */
637 gcc_assert (derived
->f2k_derived
);
638 root
= (uop
? derived
->f2k_derived
->tb_uop_root
639 : derived
->f2k_derived
->tb_sym_root
);
641 /* Set default to failure. */
645 /* Try to find it in the current type's namespace. */
646 res
= gfc_find_symtree (root
, name
);
647 if (res
&& res
->n
.tb
&& !res
->n
.tb
->error
)
653 if (!noaccess
&& derived
->attr
.use_assoc
654 && res
->n
.tb
->access
== ACCESS_PRIVATE
)
657 gfc_error ("'%s' of '%s' is PRIVATE at %L",
658 name
, derived
->name
, where
);
666 /* Otherwise, recurse on parent type if derived is an extension. */
667 if (derived
->attr
.extension
)
669 gfc_symbol
* super_type
;
670 super_type
= gfc_get_derived_super_type (derived
);
671 gcc_assert (super_type
);
673 return find_typebound_proc_uop (super_type
, t
, name
,
674 noaccess
, uop
, where
);
682 /* Find a type-bound procedure or user operator by name for a derived-type
683 (looking recursively through the super-types). */
686 gfc_find_typebound_proc (gfc_symbol
* derived
, gfc_try
* t
,
687 const char* name
, bool noaccess
, locus
* where
)
689 return find_typebound_proc_uop (derived
, t
, name
, noaccess
, false, where
);
693 gfc_find_typebound_user_op (gfc_symbol
* derived
, gfc_try
* t
,
694 const char* name
, bool noaccess
, locus
* where
)
696 return find_typebound_proc_uop (derived
, t
, name
, noaccess
, true, where
);
700 /* Find a type-bound intrinsic operator looking recursively through the
701 super-type hierarchy. */
704 gfc_find_typebound_intrinsic_op (gfc_symbol
* derived
, gfc_try
* t
,
705 gfc_intrinsic_op op
, bool noaccess
,
708 gfc_typebound_proc
* res
;
710 /* Set default to failure. */
714 /* Try to find it in the current type's namespace. */
715 if (derived
->f2k_derived
)
716 res
= derived
->f2k_derived
->tb_op
[op
];
721 if (res
&& !res
->error
)
727 if (!noaccess
&& derived
->attr
.use_assoc
728 && res
->access
== ACCESS_PRIVATE
)
731 gfc_error ("'%s' of '%s' is PRIVATE at %L",
732 gfc_op2string (op
), derived
->name
, where
);
740 /* Otherwise, recurse on parent type if derived is an extension. */
741 if (derived
->attr
.extension
)
743 gfc_symbol
* super_type
;
744 super_type
= gfc_get_derived_super_type (derived
);
745 gcc_assert (super_type
);
747 return gfc_find_typebound_intrinsic_op (super_type
, t
, op
,
756 /* Get a typebound-procedure symtree or create and insert it if not yet
757 present. This is like a very simplified version of gfc_get_sym_tree for
758 tbp-symtrees rather than regular ones. */
761 gfc_get_tbp_symtree (gfc_symtree
**root
, const char *name
)
765 result
= gfc_find_symtree (*root
, name
);
768 result
= gfc_new_symtree (root
, name
);