/*
- * Copyright (C) 1995-2008 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.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
* @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
+ * der nicht erreichbaren Methoden wird aus der Abschätzung der
* Aufrufrelation bestimmt.
*/
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include "config.h"
#include "ircgopt.h"
#include "irloop_t.h"
#include "irflag_t.h"
#include "ircons.h"
+#include "cgana.h"
#include "irtools.h"
+#include "irpass.h"
-DEBUG_ONLY(static firm_dbg_module_t *dbg);
+DEBUG_ONLY(static firm_dbg_module_t *dbg;)
/**
* 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 collect_call(ir_node *node, void *env)
+{
+ ir_node *head = (ir_node*)env;
if (is_Call(node)) {
set_irn_link(node, get_irn_link(head));
}
}
-/**
- * Type walker, set the peculiarity of entities which graphs
- * gets removed to peculiarity_description.
- */
-static void make_entity_to_description(type_or_ent tore, void *env) {
- if (is_entity(tore.ent)) {
- ir_entity *ent = tore.ent;
-
- 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, ir_entity ** keep_arr) {
+void gc_irgs(size_t n_keep, ir_entity ** keep_arr)
+{
void * MARK = &MARK; /* @@@ gefaehrlich!!! Aber wir markieren hoechstens zu viele ... */
- int i;
FIRM_DBG_REGISTER(dbg, "firm.opt.cgopt");
/* Mark entities that are alive. */
if (n_keep > 0) {
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);
- DB((dbg, LEVEL_1, " method %+F kept alive.\n", marked[i]));
+ size_t idx;
+
+ for (idx = 0; idx < n_keep; ++idx) {
+ marked[idx] = keep_arr[idx];
+ set_entity_link(marked[idx], MARK);
+ DB((dbg, LEVEL_1, " method %+F kept alive.\n", marked[idx]));
}
- for (i = 0; i < ARR_LEN(marked); ++i) {
- /* 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);
+ for (idx = 0; idx < ARR_LEN(marked); ++idx) {
+ ir_graph *irg = get_entity_irg(marked[idx]);
+ ir_node *node;
+
+ if (irg == NULL)
+ continue;
- /* collect calls */
- ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
- irg_walk_graph(irg, firm_clear_link, collect_call, node);
+ node = get_irg_end(irg);
- /* iterate calls */
- for (node = get_irn_link(node); node; node = get_irn_link(node)) {
- int i;
- assert(is_Call(node));
+ /* collect calls */
+ ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
+ irg_walk_graph(irg, firm_clear_link, collect_call, node);
- for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
- ir_entity *ent = get_Call_callee(node, i);
+ /* iterate calls */
+ for (node = (ir_node*)get_irn_link(node); node != NULL;
+ node = (ir_node*)get_irn_link(node)) {
+ for (size_t i = get_Call_n_callees(node); i > 0;) {
+ 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_entity_irg(ent) && get_entity_link(ent) != MARK) {
+ set_entity_link(ent, MARK);
+ ARR_APP1(ir_entity *, marked, ent);
- DB((dbg, LEVEL_1, " method %+F can be called from Call %+F: kept alive.\n",
- ent, node));
- }
+ DB((dbg, LEVEL_1, " method %+F can be called from Call %+F: kept alive.\n",
+ ent, node));
}
}
- ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
}
+ ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
}
DEL_ARR_F(marked);
}
/* clean */
- type_walk(make_entity_to_description, NULL, MARK);
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ for (size_t i = get_irp_n_irgs(); i-- != 0;) {
ir_graph *irg = get_irp_irg(i);
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);
- DB((dbg, LEVEL_1, " freeing method %+F\n", ent));
- }
- set_entity_link(ent, NULL);
+ if (get_entity_link(ent) == MARK)
+ continue;
+
+ DB((dbg, LEVEL_1, " freeing method %+F\n", ent));
+ free_ir_graph(irg);
}
}
+
+/**
+ * Wrapper for running gc_irgs() as an ir_prog pass.
+ */
+static void pass_wrapper(void)
+{
+ ir_entity **keep_methods;
+ size_t arr_len;
+
+ /* Analysis that finds the free methods,
+ i.e. methods that are dereferenced.
+ Optimizes polymorphic calls :-). */
+ arr_len = cgana(&keep_methods);
+
+ /* Remove methods that are never called. */
+ gc_irgs(arr_len, keep_methods);
+
+ xfree(keep_methods);
+}
+
+ir_prog_pass_t *gc_irgs_pass(const char *name)
+{
+ return def_prog_pass(name ? name : "cgana", pass_wrapper);
+}
projects / libfirm / blobdiff