/*
- * Project: libFIRM
- * File name: ir/ir/ircgopt.c
- * Purpose: Removal of unreachable methods.
- * Author: Hubert Schmid
- * Modified by:
- * Created: 09.06.2002
- * CVS-ID: $Id$
- * Copyright: (c) 2002-2003 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
*/
/**
+ * @file
+ * @brief Removal of unreachable methods.
+ * @author Hubert Schmid
+ * @date 09.06.2002
+ * @version $Id$
+ */
+
+/*
* Entfernen von nicht erreichbaren (aufrufbaren) Methoden. Die Menge
* der nicht erreichbaren Methoden wird aus der Abschätzung der
* Aufrufrelation bestimmt.
*/
-
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
#include "ircgopt.h"
#include "array.h"
#include "irprog.h"
#include "irgwalk.h"
+#include "irloop_t.h"
+#include "irflag_t.h"
+#include "ircons.h"
+#include "irtools.h"
+/**
+ * Walker: adds Call operations to a head's link list.
+ */
+static void collect_call(ir_node * node, void *env) {
+ ir_node *head = env;
-static void clear_link(ir_node * node, void * env) {
- set_irn_link(node, NULL);
-}
-
-
-/* Call-Operationen an die "link"-Liste von "call_head" anhängen. */
-static void collect_call(ir_node * node, ir_node * head) {
if (get_irn_op(node) == op_Call) {
set_irn_link(node, get_irn_link(head));
set_irn_link(head, node);
}
}
+static void make_entity_to_description(type_or_ent *tore, void *env) {
+ if (get_kind(tore) == k_entity) {
+ ir_entity *ent = (ir_entity *)tore;
+ if ((is_Method_type(get_entity_type(ent))) &&
+ (get_entity_peculiarity(ent) != peculiarity_description) &&
+ (get_entity_visibility(ent) != visibility_external_allocated) ) {
+ ir_entity *impl = get_SymConst_entity(get_atomic_ent_value(ent));
+ if (get_entity_link(impl) != env) {
+ set_entity_peculiarity(ent, peculiarity_description);
+ }
+ }
+ }
+}
/* garbage collect methods: mark and remove */
-void gc_irgs(int n_keep, entity ** keep_arr) {
- void * MARK = &MARK;
+void gc_irgs(int n_keep, ir_entity ** keep_arr) {
+ void * MARK = &MARK; /* @@@ gefaehrlich!!! Aber wir markieren hoechstens zu viele ... */
int i;
- /* mark */
+ if (!get_opt_dead_method_elimination()) return;
+
+ if (n_keep >= get_irp_n_irgs()) {
+ /* Shortcut. Obviously we have to keep all methods. */
+ return;
+ }
+
+ /* Mark entities that are alive. */
if (n_keep > 0) {
- entity ** marked = NEW_ARR_F(entity *, n_keep);
+ ir_entity ** marked = NEW_ARR_F(ir_entity *, n_keep);
for (i = 0; i < n_keep; ++i) {
marked[i] = keep_arr[i];
set_entity_link(marked[i], MARK);
+ if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 2) {
+ printf("dead method elimination: method %s kept alive.\n", get_entity_ld_name(marked[i]));
+ }
}
+
for (i = 0; i < ARR_LEN(marked); ++i) {
- ir_graph * irg = get_entity_irg(marked[i]);
- ir_node * node = get_irg_end(irg);
- /* collect calls */
- irg_walk_graph(irg, clear_link, (irg_walk_func *) collect_call, node);
- /* iterate calls */
- for (node = get_irn_link(node); node; node = get_irn_link(node)) {
- int i;
- assert(get_irn_op(node) == op_Call);
- for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
- entity * ent = get_Call_callee(node, i);
- if (ent && get_entity_irg(ent) && get_entity_link(ent) != MARK) {
- set_entity_link(ent, MARK);
- ARR_APP1(entity *, marked, ent);
- }
- }
+ /* check for extern methods, these don't have an IRG */
+ if (get_entity_visibility(marked[i]) != visibility_external_allocated) {
+ ir_graph * irg = get_entity_irg(marked[i]);
+ ir_node * node = get_irg_end(irg);
+
+ /* collect calls */
+ irg_walk_graph(irg, firm_clear_link, collect_call, node);
+
+ /* iterate calls */
+ for (node = get_irn_link(node); node; node = get_irn_link(node)) {
+ int i;
+ assert(get_irn_op(node) == op_Call);
+
+ for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
+ ir_entity * ent = get_Call_callee(node, i);
+
+ if (get_entity_irg(ent) && get_entity_link(ent) != MARK) {
+ set_entity_link(ent, MARK);
+ ARR_APP1(ir_entity *, marked, ent);
+ if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 2) {
+ printf("dead method elimination: method %s can be called from Call %ld: kept alive.\n",
+ get_entity_ld_name(ent), get_irn_node_nr(node));
+ }
+ }
+ }
+ }
}
}
DEL_ARR_F(marked);
}
/* clean */
+ type_walk(make_entity_to_description, NULL, MARK);
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
ir_graph * irg = get_irp_irg(i);
- entity * ent = get_irg_ent(irg);
- if (get_entity_link(ent) != MARK) {
+ ir_entity * ent = get_irg_entity(irg);
+ /* Removing any graph invalidates all interprocedural loop trees. */
+ if (get_irg_loopinfo_state(irg) == loopinfo_ip_consistent ||
+ get_irg_loopinfo_state(irg) == loopinfo_ip_inconsistent) {
+ free_loop_information(irg);
+ }
+ if ((get_entity_visibility(ent) == visibility_local) && (get_entity_link(ent) != MARK)) {
remove_irp_irg(irg);
set_entity_peculiarity(ent, peculiarity_description);
+ if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 1) {
+ printf("dead method elimination: freeing method %s\n", get_entity_ld_name(ent));
+ }
}
set_entity_link(ent, NULL);
}
projects / libfirm / blobdiff