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.
33 /* Call-Operationen an die "link"-Liste von "call_head" anhängen. */
34 static void collect_call(ir_node * node, ir_node * head) {
35 if (get_irn_op(node) == op_Call) {
36 set_irn_link(node, get_irn_link(head));
37 set_irn_link(head, node);
41 static void make_entity_to_description(type_or_ent *tore, void *env) {
42 if (get_kind(tore) == k_entity) {
43 entity *ent = (entity *)tore;
45 if ((is_Method_type(get_entity_type(ent))) &&
46 (get_entity_peculiarity(ent) != peculiarity_description) &&
47 (get_entity_visibility(ent) != visibility_external_allocated) ) {
48 entity *impl = get_SymConst_entity(get_atomic_ent_value(ent));
49 if (get_entity_link(impl) != env) {
50 set_entity_peculiarity(ent, peculiarity_description);
56 /* garbage collect methods: mark and remove */
57 void gc_irgs(int n_keep, entity ** keep_arr) {
58 void * MARK = &MARK; /* @@@ gefaehrlich!!! Aber wir markieren hoechstens zu viele ... */
61 if (!get_opt_dead_method_elimination()) return;
63 /* Mark entities that are alive. */
65 entity ** marked = NEW_ARR_F(entity *, n_keep);
66 for (i = 0; i < n_keep; ++i) {
67 marked[i] = keep_arr[i];
68 set_entity_link(marked[i], MARK);
69 if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 2) {
70 printf("dead method elimination: method %s kept alive.\n", get_entity_ld_name(marked[i]));
73 for (i = 0; i < ARR_LEN(marked); ++i) {
74 /* check for extern methods, these don't have an IRG */
75 if (get_entity_visibility(marked[i]) != visibility_external_allocated) {
76 ir_graph * irg = get_entity_irg(marked[i]);
77 ir_node * node = get_irg_end(irg);
79 irg_walk_graph(irg, firm_clear_link, (irg_walk_func *) collect_call, node);
81 for (node = get_irn_link(node); node; node = get_irn_link(node)) {
83 assert(get_irn_op(node) == op_Call);
84 for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
85 entity * ent = get_Call_callee(node, i);
86 if (get_entity_irg(ent) && get_entity_link(ent) != MARK) {
87 set_entity_link(ent, MARK);
88 ARR_APP1(entity *, marked, ent);
89 if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 2) {
90 printf("dead method elimination: method %s can be called from Call %ld: kept alive.\n",
91 get_entity_ld_name(ent), get_irn_node_nr(node));
102 type_walk(make_entity_to_description, NULL, MARK);
103 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
104 ir_graph * irg = get_irp_irg(i);
105 entity * ent = get_irg_entity(irg);
106 /* Removing any graph invalidates all interprocedural loop trees. */
107 if (get_irg_loopinfo_state(irg) == loopinfo_ip_consistent ||
108 get_irg_loopinfo_state(irg) == loopinfo_ip_inconsistent) {
109 free_loop_information(irg);
111 if ((get_entity_visibility(ent) == visibility_local) && (get_entity_link(ent) != MARK)) {
113 set_entity_peculiarity(ent, peculiarity_description);
114 if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 1) {
115 printf("dead method elimination: freeing method %s\n", get_entity_ld_name(ent));
118 set_entity_link(ent, NULL);