2 * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Removal of unreachable methods.
23 * @author Hubert Schmid
29 * Entfernen von nicht erreichbaren (aufrufbaren) Methoden. Die Menge
30 * der nicht erreichbaren Methoden wird aus der Abschätzung der
31 * Aufrufrelation bestimmt.
49 * Walker: adds Call operations to a head's link list.
51 static void collect_call(ir_node * node, void *env) {
54 if (get_irn_op(node) == op_Call) {
55 set_irn_link(node, get_irn_link(head));
56 set_irn_link(head, node);
60 static void make_entity_to_description(type_or_ent *tore, void *env) {
61 if (get_kind(tore) == k_entity) {
62 ir_entity *ent = (ir_entity *)tore;
64 if ((is_Method_type(get_entity_type(ent))) &&
65 (get_entity_peculiarity(ent) != peculiarity_description) &&
66 (get_entity_visibility(ent) != visibility_external_allocated) ) {
67 ir_entity *impl = get_SymConst_entity(get_atomic_ent_value(ent));
68 if (get_entity_link(impl) != env) {
69 set_entity_peculiarity(ent, peculiarity_description);
75 /* garbage collect methods: mark and remove */
76 void gc_irgs(int n_keep, ir_entity ** keep_arr) {
77 void * MARK = &MARK; /* @@@ gefaehrlich!!! Aber wir markieren hoechstens zu viele ... */
80 if (!get_opt_dead_method_elimination()) return;
82 if (n_keep >= get_irp_n_irgs()) {
83 /* Shortcut. Obviously we have to keep all methods. */
87 /* Mark entities that are alive. */
89 ir_entity ** marked = NEW_ARR_F(ir_entity *, n_keep);
90 for (i = 0; i < n_keep; ++i) {
91 marked[i] = keep_arr[i];
92 set_entity_link(marked[i], MARK);
93 if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 2) {
94 printf("dead method elimination: method %s kept alive.\n", get_entity_ld_name(marked[i]));
98 for (i = 0; i < ARR_LEN(marked); ++i) {
99 /* check for extern methods, these don't have an IRG */
100 if (get_entity_visibility(marked[i]) != visibility_external_allocated) {
101 ir_graph * irg = get_entity_irg(marked[i]);
102 ir_node * node = get_irg_end(irg);
105 irg_walk_graph(irg, firm_clear_link, collect_call, node);
108 for (node = get_irn_link(node); node; node = get_irn_link(node)) {
110 assert(get_irn_op(node) == op_Call);
112 for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
113 ir_entity * ent = get_Call_callee(node, i);
115 if (get_entity_irg(ent) && get_entity_link(ent) != MARK) {
116 set_entity_link(ent, MARK);
117 ARR_APP1(ir_entity *, marked, ent);
118 if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 2) {
119 printf("dead method elimination: method %s can be called from Call %ld: kept alive.\n",
120 get_entity_ld_name(ent), get_irn_node_nr(node));
131 type_walk(make_entity_to_description, NULL, MARK);
132 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
133 ir_graph * irg = get_irp_irg(i);
134 ir_entity * ent = get_irg_entity(irg);
135 /* Removing any graph invalidates all interprocedural loop trees. */
136 if (get_irg_loopinfo_state(irg) == loopinfo_ip_consistent ||
137 get_irg_loopinfo_state(irg) == loopinfo_ip_inconsistent) {
138 free_loop_information(irg);
140 if ((get_entity_visibility(ent) == visibility_local) && (get_entity_link(ent) != MARK)) {
142 set_entity_peculiarity(ent, peculiarity_description);
143 if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 1) {
144 printf("dead method elimination: freeing method %s\n", get_entity_ld_name(ent));
147 set_entity_link(ent, NULL);