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 * File name: ir/opt/opt_frame.c
23 * Purpose: optimize the frame type
24 * Author: Michael Beck
27 * Copyright: (c) 1998-2006 Universität Karlsruhe
33 * Optimize the frame type by removing unused type members.
40 #include "irgraph_t.h"
44 #include "opt_frame.h"
47 * Optimize the frame type of an irg by removing
48 * never touched entities.
50 void opt_frame_irg(ir_graph *irg) {
51 ir_type *frame_tp = get_irg_frame_type(irg);
52 ir_entity *ent, *list;
54 int i, n = get_class_n_members(frame_tp);
56 assert(get_irg_phase_state(irg) == phase_high && "Graph must be in high phase");
60 /* clear all entity links */
61 for (i = n - 1; i >= 0; --i) {
62 ent = get_class_member(frame_tp, i);
63 set_entity_link(ent, NULL);
67 frame = get_irg_frame(irg);
69 if (edges_activated(irg)) { /* use inplace edges */
70 const ir_edge_t *edge;
72 /* mark all used entities */
73 foreach_out_edge(frame, edge) {
74 sel = get_edge_src_irn(edge);
75 ent = get_Sel_entity(sel);
76 set_entity_link(ent, ent);
80 /* use traditionally out edges */
81 if (get_irg_outs_state(irg) != outs_consistent)
82 compute_irg_outs(irg);
84 /* mark all used entities */
85 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
86 sel = get_irn_out(frame, i);
87 ent = get_Sel_entity(sel);
88 set_entity_link(ent, ent);
92 /* link unused ones */
94 for (i = n - 1; i >= 0; --i) {
95 ent = get_class_member(frame_tp, i);
96 if (get_entity_link(ent) == NULL) {
97 set_entity_link(ent, list);
103 /* delete list members */
104 for (ent = list; ent; ent = list) {
105 list = get_entity_link(ent);
106 remove_class_member(frame_tp, ent);
108 /* we changed the frame type, it's layout should be redefined */
109 set_type_state(frame_tp, layout_undefined);