3 * File name: ir/ir/ircgopt.c
4 * Purpose: Removal of unreachable methods.
5 * Author: Hubert Schmid
9 * Copyright: (c) 2002-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
14 * Entfernen von nicht erreichbaren (aufrufbaren) Methoden. Die Menge
15 * der nicht erreichbaren Methoden wird aus der Abschätzung der
16 * Aufrufrelation bestimmt.
27 static void clear_link(ir_node * node, void * env) {
28 set_irn_link(node, NULL);
32 /* Call-Operationen an die "link"-Liste von "call_head" anhängen. */
33 static void collect_call(ir_node * node, ir_node * head) {
34 if (get_irn_op(node) == op_Call) {
35 set_irn_link(node, get_irn_link(head));
36 set_irn_link(head, node);
42 /* garbage collect methods: mark and remove */
43 void gc_irgs(int n_keep, entity ** keep_arr) {
49 entity ** marked = NEW_ARR_F(entity *, n_keep);
50 for (i = 0; i < n_keep; ++i) {
51 marked[i] = keep_arr[i];
52 set_entity_link(marked[i], MARK);
54 for (i = 0; i < ARR_LEN(marked); ++i) {
55 ir_graph * irg = get_entity_irg(marked[i]);
56 ir_node * node = get_irg_end(irg);
58 irg_walk_graph(irg, clear_link, (irg_walk_func *) collect_call, node);
60 for (node = get_irn_link(node); node; node = get_irn_link(node)) {
62 assert(get_irn_op(node) == op_Call);
63 for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
64 entity * ent = get_Call_callee(node, i);
65 if (ent && get_entity_irg(ent) && get_entity_link(ent) != MARK) {
66 set_entity_link(ent, MARK);
67 ARR_APP1(entity *, marked, ent);
76 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
77 ir_graph * irg = get_irp_irg(i);
78 entity * ent = get_irg_ent(irg);
79 if (get_entity_link(ent) != MARK) {
81 set_entity_peculiarity(ent, description);
83 set_entity_link(ent, NULL);