/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* @brief Optimize the frame type.
* @date 15.03.2006
* @author Michael Beck
- * @version $Id$
- * @summary
+ * @brief
* Optimize the frame type by removing unused type members.
*/
#include "config.h"
#include "type_t.h"
#include "irouts.h"
#include "iredges.h"
+#include "irpass.h"
/*
* Optimize the frame type of an irg by removing
* never touched entities.
*/
-void opt_frame_irg(ir_graph *irg) {
+void opt_frame_irg(ir_graph *irg)
+{
ir_type *frame_tp = get_irg_frame_type(irg);
ir_entity *ent, *list;
ir_node *frame, *sel;
- int i, n = get_class_n_members(frame_tp);
+ size_t i, n = get_class_n_members(frame_tp);
+ int o;
if (n <= 0)
return;
- irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
+ assure_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
+
+ irp_reserve_resources(irp, IRP_RESOURCE_ENTITY_LINK);
/* clear all entity links */
- for (i = n - 1; i >= 0; --i) {
- ent = get_class_member(frame_tp, i);
+ for (i = n; i > 0;) {
+ ent = get_class_member(frame_tp, --i);
set_entity_link(ent, NULL);
}
/* look for uses */
frame = get_irg_frame(irg);
- if (edges_activated(irg)) { /* use inplace edges */
- const ir_edge_t *edge;
-
- /* mark all used entities */
- foreach_out_edge(frame, edge) {
- sel = get_edge_src_irn(edge);
- if (is_Sel(sel)) {
- ent = get_Sel_entity(sel);
- set_entity_link(ent, ent);
- }
- }
- } else {
- /* use traditionally out edges */
- assure_irg_outs(irg);
-
- /* mark all used entities */
- for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
- sel = get_irn_out(frame, i);
- if (is_Sel(sel)) {
- ent = get_Sel_entity(sel);
+ /* mark all used entities */
+ for (o = get_irn_n_outs(frame) - 1; o >= 0; --o) {
+ sel = get_irn_out(frame, o);
+ if (is_Sel(sel)) {
+ ent = get_Sel_entity(sel);
+ /* only entities on the frame */
+ if (get_entity_owner(ent) == frame_tp)
set_entity_link(ent, ent);
- }
}
}
/* link unused ones */
list = NULL;
- for (i = n - 1; i >= 0; --i) {
- ent = get_class_member(frame_tp, i);
- if (get_entity_link(ent) == NULL) {
+ for (i = n; i > 0;) {
+ ent = get_class_member(frame_tp, --i);
+ /* beware of inner functions: those are NOT unused */
+ if (get_entity_link(ent) == NULL && !is_method_entity(ent)) {
set_entity_link(ent, list);
list = ent;
}
if (list != NULL) {
/* delete list members */
for (ent = list; ent; ent = list) {
- list = get_entity_link(ent);
- remove_class_member(frame_tp, ent);
+ list = (ir_entity*)get_entity_link(ent);
+ free_entity(ent);
}
- /* we changed the frame type, it's layout should be redefined */
+ /* we changed the frame type, its layout should be redefined */
set_type_state(frame_tp, layout_undefined);
}
- irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
+ irp_free_resources(irp, IRP_RESOURCE_ENTITY_LINK);
+
+ /* we changed the type, this affects none of the currently known graph
+ * properties, but I don't use ALL because I don't know if someone adds
+ * type-based properties at some point */
+ confirm_irg_properties(irg,
+ IR_GRAPH_PROPERTIES_CONTROL_FLOW
+ | IR_GRAPH_PROPERTY_NO_BADS
+ | IR_GRAPH_PROPERTY_NO_TUPLES
+ | IR_GRAPH_PROPERTY_CONSISTENT_OUT_EDGES
+ | IR_GRAPH_PROPERTY_CONSISTENT_OUTS
+ | IR_GRAPH_PROPERTY_CONSISTENT_ENTITY_USAGE
+ | IR_GRAPH_PROPERTY_MANY_RETURNS);
+}
+
+ir_graph_pass_t *opt_frame_irg_pass(const char *name)
+{
+ return def_graph_pass(name ? name : "opt_frame_irg", opt_frame_irg);
}