/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* 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);
/**
* 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 = env;
+
+ if (is_Call(node)) {
+ set_irn_link(node, get_irn_link(head));
+ set_irn_link(head, node);
+ }
+}
- if (get_irn_op(node) == op_Call) {
- set_irn_link(node, get_irn_link(head));
- set_irn_link(head, node);
- }
+/* garbage collect methods: mark and remove */
+void gc_irgs(int 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");
+
+ if (n_keep >= get_irp_n_irgs()) {
+ /* Shortcut. Obviously we have to keep all methods. */
+ return;
+ }
+
+ DB((dbg, LEVEL_1, "dead method elimination\n"));
+
+ /* 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]));
+ }
+
+ for (i = 0; i < ARR_LEN(marked); ++i) {
+ ir_graph *irg = get_entity_irg(marked[i]);
+ ir_node *node;
+
+ if (irg == NULL)
+ continue;
+
+ node = get_irg_end(irg);
+
+ /* collect calls */
+ ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
+ 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(is_Call(node));
+
+ 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);
+
+ 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);
+ }
+ DEL_ARR_F(marked);
+ }
+
+ /* clean */
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ ir_graph *irg = get_irp_irg(i);
+ ir_entity *ent = get_irg_entity(irg);
+
+ if (get_entity_link(ent) == MARK)
+ continue;
+
+ DB((dbg, LEVEL_1, " freeing method %+F\n", ent));
+ remove_irp_irg(irg);
+
+ remove_class_member(get_entity_owner(ent), ent);
+ }
}
-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);
- }
- }
- }
+/**
+ * Wrapper for running gc_irgs() as an ir_prog pass.
+ */
+static void pass_wrapper(void)
+{
+ ir_entity **keep_methods;
+ int arr_len;
+
+ /* Analysis that finds the free methods,
+ i.e. methods that are dereferenced.
+ Optimizes polymorphic calls :-). */
+ cgana(&arr_len, &keep_methods);
+
+ /* Remove methods that are never called. */
+ gc_irgs(arr_len, keep_methods);
+
+ free(keep_methods);
}
-/* garbage collect methods: mark and remove */
-void gc_irgs(int 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");
-
- 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) {
- 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_2, "dead method elimination: method %s kept alive.\n",
- get_entity_ld_name(marked[i])));
- }
-
- 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);
-
- /* 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);
-
- DB((dbg, LEVEL_2, "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);
- 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_2, "dead method elimination: freeing method %s\n",
- get_entity_ld_name(ent)));
- }
- set_entity_link(ent, NULL);
- }
+ir_prog_pass_t *gc_irgs_pass(const char *name)
+{
+ return def_prog_pass(name ? name : "cgana", pass_wrapper);
}
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