2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Optimize the frame type.
24 * @author Michael Beck
27 * Optimize the frame type by removing unused type members.
31 #include "iroptimize.h"
32 #include "irgraph_t.h"
39 * Optimize the frame type of an irg by removing
40 * never touched entities.
42 void opt_frame_irg(ir_graph *irg) {
43 ir_type *frame_tp = get_irg_frame_type(irg);
44 ir_entity *ent, *list;
46 int i, n = get_class_n_members(frame_tp);
51 irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
53 /* clear all entity links */
54 for (i = n - 1; i >= 0; --i) {
55 ent = get_class_member(frame_tp, i);
56 set_entity_link(ent, NULL);
60 frame = get_irg_frame(irg);
62 if (edges_activated(irg)) { /* use inplace edges */
63 const ir_edge_t *edge;
65 /* mark all used entities */
66 foreach_out_edge(frame, edge) {
67 sel = get_edge_src_irn(edge);
69 ent = get_Sel_entity(sel);
70 set_entity_link(ent, ent);
74 /* use traditionally out edges */
77 /* mark all used entities */
78 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
79 sel = get_irn_out(frame, i);
81 ent = get_Sel_entity(sel);
82 /* only entities on the frame */
83 if (get_entity_owner(ent) == frame_tp)
84 set_entity_link(ent, ent);
89 /* link unused ones */
91 for (i = n - 1; i >= 0; --i) {
92 ent = get_class_member(frame_tp, i);
93 /* beware of inner functions: those are NOT unused */
94 if (get_entity_link(ent) == NULL && !is_method_entity(ent)) {
95 set_entity_link(ent, list);
101 /* delete list members */
102 for (ent = list; ent; ent = list) {
103 list = get_entity_link(ent);
104 remove_class_member(frame_tp, ent);
106 /* we changed the frame type, it's layout should be redefined */
107 set_type_state(frame_tp, layout_undefined);
109 irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
112 ir_graph_pass_t *opt_frame_irg_pass(const char *name)
114 return def_graph_pass(name ? name : "opt_frame_irg", opt_frame_irg);