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.
29 static void clear_link(ir_node * node, void * env) {
30 set_irn_link(node, NULL);
34 /* Call-Operationen an die "link"-Liste von "call_head" anhängen. */
35 static void collect_call(ir_node * node, ir_node * head) {
36 if (get_irn_op(node) == op_Call) {
37 set_irn_link(node, get_irn_link(head));
38 set_irn_link(head, node);
44 /* garbage collect methods: mark and remove */
45 void gc_irgs(int n_keep, entity ** keep_arr) {
51 entity ** marked = NEW_ARR_F(entity *, n_keep);
52 for (i = 0; i < n_keep; ++i) {
53 marked[i] = keep_arr[i];
54 set_entity_link(marked[i], MARK);
56 for (i = 0; i < ARR_LEN(marked); ++i) {
57 /* check for extern methods, these don't have an IRG */
58 if (get_entity_visibility(marked[i]) != visibility_external_allocated) {
59 ir_graph * irg = get_entity_irg(marked[i]);
60 ir_node * node = get_irg_end(irg);
62 irg_walk_graph(irg, clear_link, (irg_walk_func *) collect_call, node);
64 for (node = get_irn_link(node); node; node = get_irn_link(node)) {
66 assert(get_irn_op(node) == op_Call);
67 for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
68 entity * ent = get_Call_callee(node, i);
69 if (ent && get_entity_irg(ent) && get_entity_link(ent) != MARK) {
70 set_entity_link(ent, MARK);
71 ARR_APP1(entity *, marked, ent);
81 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
82 ir_graph * irg = get_irp_irg(i);
83 entity * ent = get_irg_ent(irg);
84 if (get_entity_link(ent) != MARK) {
86 set_entity_peculiarity(ent, peculiarity_description);
88 set_entity_link(ent, NULL);