2 * This file is part of libFirm.
3 * Copyright (C) 2012 University of Karlsruhe.
8 * @brief Optimize the frame type.
10 * @author Michael Beck
12 * Optimize the frame type by removing unused type members.
16 #include "iroptimize.h"
17 #include "irgraph_t.h"
24 * Optimize the frame type of an irg by removing
25 * never touched entities.
27 void opt_frame_irg(ir_graph *irg)
29 ir_type *frame_tp = get_irg_frame_type(irg);
30 ir_entity *ent, *list;
32 size_t i, n = get_class_n_members(frame_tp);
38 assure_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
40 irp_reserve_resources(irp, IRP_RESOURCE_ENTITY_LINK);
42 /* clear all entity links */
44 ent = get_class_member(frame_tp, --i);
45 set_entity_link(ent, NULL);
49 frame = get_irg_frame(irg);
51 /* mark all used entities */
52 for (o = get_irn_n_outs(frame) - 1; o >= 0; --o) {
53 sel = get_irn_out(frame, o);
55 ent = get_Sel_entity(sel);
56 /* only entities on the frame */
57 if (get_entity_owner(ent) == frame_tp)
58 set_entity_link(ent, ent);
62 /* link unused ones */
65 ent = get_class_member(frame_tp, --i);
66 /* beware of inner functions: those are NOT unused */
67 if (get_entity_link(ent) == NULL && !is_method_entity(ent)) {
68 set_entity_link(ent, list);
74 /* delete list members */
75 for (ent = list; ent; ent = list) {
76 list = (ir_entity*)get_entity_link(ent);
79 /* we changed the frame type, its layout should be redefined */
80 set_type_state(frame_tp, layout_undefined);
82 irp_free_resources(irp, IRP_RESOURCE_ENTITY_LINK);
84 /* we changed the type, this affects none of the currently known graph
85 * properties, but I don't use ALL because I don't know if someone adds
86 * type-based properties at some point */
87 confirm_irg_properties(irg,
88 IR_GRAPH_PROPERTIES_CONTROL_FLOW
89 | IR_GRAPH_PROPERTY_NO_BADS
90 | IR_GRAPH_PROPERTY_NO_TUPLES
91 | IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES
92 | IR_GRAPH_PROPERTY_CONSISTENT_OUTS
93 | IR_GRAPH_PROPERTY_CONSISTENT_ENTITY_USAGE
94 | IR_GRAPH_PROPERTY_MANY_RETURNS);
97 ir_graph_pass_t *opt_frame_irg_pass(const char *name)
99 return def_graph_pass(name ? name : "opt_frame_irg", opt_frame_irg);