3 * File name: ir/opt/opt_frame.c
4 * Purpose: optimize the frame type
8 * Copyright: (c) 1998-2006 Universität Karlsruhe
9 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
15 * Optimize the frame type by removing unused type members.
22 #include "irgraph_t.h"
26 #include "opt_frame.h"
29 * Optimize the frame type of an irg by removing
30 * never touched entities.
32 void opt_frame_irg(ir_graph *irg) {
33 ir_type *frame_tp = get_irg_frame_type(irg);
34 ir_entity *ent, *list;
36 int i, n = get_class_n_members(frame_tp);
38 assert(get_irg_phase_state(irg) == phase_high && "Graph must be in high phase");
42 /* clear all entity links */
43 for (i = n - 1; i >= 0; --i) {
44 ent = get_class_member(frame_tp, i);
45 set_entity_link(ent, NULL);
49 frame = get_irg_frame(irg);
51 if (edges_activated(irg)) { /* use inplace edges */
52 const ir_edge_t *edge;
54 /* mark all used entities */
55 foreach_out_edge(frame, edge) {
56 sel = get_edge_src_irn(edge);
57 ent = get_Sel_entity(sel);
58 set_entity_link(ent, ent);
62 /* use traditionally out edges */
63 if (get_irg_outs_state(irg) != outs_consistent)
64 compute_irg_outs(irg);
66 /* mark all used entities */
67 for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
68 sel = get_irn_out(frame, i);
69 ent = get_Sel_entity(sel);
70 set_entity_link(ent, ent);
74 /* link unused ones */
76 for (i = n - 1; i >= 0; --i) {
77 ent = get_class_member(frame_tp, i);
78 if (get_entity_link(ent) == NULL) {
79 set_entity_link(ent, list);
85 /* delete list members */
86 for (ent = list; ent; ent = list) {
87 list = get_entity_link(ent);
88 remove_class_member(frame_tp, ent);
90 /* we changed the frame type, it's layout should be redefined */
91 set_type_state(frame_tp, layout_undefined);