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.
48 DEBUG_ONLY(static firm_dbg_module_t *dbg);
51 * Walker: adds Call operations to a head's link list.
53 static void collect_call(ir_node * node, void *env) {
56 if (get_irn_op(node) == op_Call) {
57 set_irn_link(node, get_irn_link(head));
58 set_irn_link(head, node);
62 static void make_entity_to_description(type_or_ent *tore, void *env) {
63 if (get_kind(tore) == k_entity) {
64 ir_entity *ent = (ir_entity *)tore;
66 if ((is_Method_type(get_entity_type(ent))) &&
67 (get_entity_peculiarity(ent) != peculiarity_description) &&
68 (get_entity_visibility(ent) != visibility_external_allocated) ) {
69 ir_entity *impl = get_SymConst_entity(get_atomic_ent_value(ent));
70 if (get_entity_link(impl) != env) {
71 set_entity_peculiarity(ent, peculiarity_description);
77 /* garbage collect methods: mark and remove */
78 void gc_irgs(int n_keep, ir_entity ** keep_arr) {
79 void * MARK = &MARK; /* @@@ gefaehrlich!!! Aber wir markieren hoechstens zu viele ... */
82 FIRM_DBG_REGISTER(dbg, "firm.opt.cgopt");
84 if (n_keep >= get_irp_n_irgs()) {
85 /* Shortcut. Obviously we have to keep all methods. */
89 /* Mark entities that are alive. */
91 ir_entity ** marked = NEW_ARR_F(ir_entity *, n_keep);
92 for (i = 0; i < n_keep; ++i) {
93 marked[i] = keep_arr[i];
94 set_entity_link(marked[i], MARK);
95 DB((dbg, LEVEL_2, "dead method elimination: method %s kept alive.\n",
96 get_entity_ld_name(marked[i])));
99 for (i = 0; i < ARR_LEN(marked); ++i) {
100 /* check for extern methods, these don't have an IRG */
101 if (get_entity_visibility(marked[i]) != visibility_external_allocated) {
102 ir_graph * irg = get_entity_irg(marked[i]);
103 ir_node * node = get_irg_end(irg);
106 irg_walk_graph(irg, firm_clear_link, collect_call, node);
109 for (node = get_irn_link(node); node; node = get_irn_link(node)) {
111 assert(get_irn_op(node) == op_Call);
113 for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
114 ir_entity * ent = get_Call_callee(node, i);
116 if (get_entity_irg(ent) && get_entity_link(ent) != MARK) {
117 set_entity_link(ent, MARK);
118 ARR_APP1(ir_entity *, marked, ent);
120 DB((dbg, LEVEL_2, "dead method elimination: method %s can be "
121 "called from Call %ld: kept alive.\n",
122 get_entity_ld_name(ent), get_irn_node_nr(node)));
132 type_walk(make_entity_to_description, NULL, MARK);
133 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
134 ir_graph * irg = get_irp_irg(i);
135 ir_entity * ent = get_irg_entity(irg);
136 /* Removing any graph invalidates all interprocedural loop trees. */
137 if (get_irg_loopinfo_state(irg) == loopinfo_ip_consistent ||
138 get_irg_loopinfo_state(irg) == loopinfo_ip_inconsistent) {
139 free_loop_information(irg);
141 if ((get_entity_visibility(ent) == visibility_local) && (get_entity_link(ent) != MARK)) {
143 set_entity_peculiarity(ent, peculiarity_description);
145 DB((dbg, LEVEL_2, "dead method elimination: freeing method %s\n",
146 get_entity_ld_name(ent)));
148 set_entity_link(ent, NULL);