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)
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 irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
54 /* clear all entity links */
55 for (i = n - 1; i >= 0; --i) {
56 ent = get_class_member(frame_tp, i);
57 set_entity_link(ent, NULL);
61 frame = get_irg_frame(irg);
63 if (edges_activated(irg)) { /* use inplace edges */
64 const ir_edge_t *edge;
66 /* mark all used entities */
67 foreach_out_edge(frame, edge) {
68 sel = get_edge_src_irn(edge);
70 ent = get_Sel_entity(sel);
71 set_entity_link(ent, ent);
75 /* use traditionally out edges */
78 /* mark all used entities */
79 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
80 sel = get_irn_out(frame, i);
82 ent = get_Sel_entity(sel);
83 /* only entities on the frame */
84 if (get_entity_owner(ent) == frame_tp)
85 set_entity_link(ent, ent);
90 /* link unused ones */
92 for (i = n - 1; i >= 0; --i) {
93 ent = get_class_member(frame_tp, i);
94 /* beware of inner functions: those are NOT unused */
95 if (get_entity_link(ent) == NULL && !is_method_entity(ent)) {
96 set_entity_link(ent, list);
102 /* delete list members */
103 for (ent = list; ent; ent = list) {
104 list = (ir_entity*)get_entity_link(ent);
107 /* we changed the frame type, it's layout should be redefined */
108 set_type_state(frame_tp, layout_undefined);
110 irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
113 ir_graph_pass_t *opt_frame_irg_pass(const char *name)
115 return def_graph_pass(name ? name : "opt_frame_irg", opt_frame_irg);