2 * Copyright (C) 1995-2007 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);
49 assert(get_irg_phase_state(irg) == phase_high && "Graph must be in high phase");
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);
68 ent = get_Sel_entity(sel);
69 set_entity_link(ent, ent);
73 /* use traditionally out edges */
74 if (get_irg_outs_state(irg) != outs_consistent)
75 compute_irg_outs(irg);
77 /* mark all used entities */
78 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
79 sel = get_irn_out(frame, i);
80 ent = get_Sel_entity(sel);
81 set_entity_link(ent, ent);
85 /* link unused ones */
87 for (i = n - 1; i >= 0; --i) {
88 ent = get_class_member(frame_tp, i);
89 if (get_entity_link(ent) == NULL) {
90 set_entity_link(ent, list);
96 /* delete list members */
97 for (ent = list; ent; ent = list) {
98 list = get_entity_link(ent);
99 remove_class_member(frame_tp, ent);
101 /* we changed the frame type, it's layout should be redefined */
102 set_type_state(frame_tp, layout_undefined);