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.
33 #include "iroptimize.h"
34 #include "irgraph_t.h"
40 * Optimize the frame type of an irg by removing
41 * never touched entities.
43 void opt_frame_irg(ir_graph *irg) {
44 ir_type *frame_tp = get_irg_frame_type(irg);
45 ir_entity *ent, *list;
47 int i, n = get_class_n_members(frame_tp);
52 /* clear all entity links */
53 for (i = n - 1; i >= 0; --i) {
54 ent = get_class_member(frame_tp, i);
55 set_entity_link(ent, NULL);
59 frame = get_irg_frame(irg);
61 if (edges_activated(irg)) { /* use inplace edges */
62 const ir_edge_t *edge;
64 /* mark all used entities */
65 foreach_out_edge(frame, edge) {
66 sel = get_edge_src_irn(edge);
67 ent = get_Sel_entity(sel);
68 set_entity_link(ent, ent);
71 /* use traditionally out edges */
74 /* mark all used entities */
75 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
76 sel = get_irn_out(frame, i);
77 ent = get_Sel_entity(sel);
78 set_entity_link(ent, ent);
82 /* link unused ones */
84 for (i = n - 1; i >= 0; --i) {
85 ent = get_class_member(frame_tp, i);
86 if (get_entity_link(ent) == NULL) {
87 set_entity_link(ent, list);
93 /* delete list members */
94 for (ent = list; ent; ent = list) {
95 list = get_entity_link(ent);
96 remove_class_member(frame_tp, ent);
98 /* we changed the frame type, it's layout should be redefined */
99 set_type_state(frame_tp, layout_undefined);