X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Fircgopt.c;h=da2b33efc8e9a0f7aec6b33850165f383c7a284e;hb=eda9d668d0e8c8246015b4c5e743316a6a835a23;hp=cf1bd514ec04d793ab9c5457fafd97ca8c5bd1d9;hpb=1ef847a519fd20484e3a5d3f6f51ed5bbc8d69cc;p=libfirm diff --git a/ir/ir/ircgopt.c b/ir/ir/ircgopt.c index cf1bd514e..da2b33efc 100644 --- a/ir/ir/ircgopt.c +++ b/ir/ir/ircgopt.c @@ -1,22 +1,37 @@ /* - * 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 +# include "config.h" #endif #include "ircgopt.h" @@ -26,52 +41,84 @@ #include "irgwalk.h" #include "irloop_t.h" #include "irflag_t.h" +#include "ircons.h" +#include "typewalk.h" +#include "irtools.h" -static void clear_link(ir_node * node, void * env) { - set_irn_link(node, NULL); -} - +/** + * Walker: adds Call operations to a head's link list. + */ +static void collect_call(ir_node * node, void *env) { + ir_node *head = env; -/* 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; if (!get_opt_dead_method_elimination()) return; - /* mark */ + 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) { /* 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, clear_link, (irg_walk_func *) collect_call, node); + 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) { - entity * ent = get_Call_callee(node, i); - if (ent && get_entity_irg(ent) && get_entity_link(ent) != MARK) { + 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(entity *, marked, ent); + 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)); + } } } } @@ -81,18 +128,19 @@ void gc_irgs(int n_keep, entity ** keep_arr) { } /* 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); + 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_link(ent) != MARK) { + 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()) { + if (get_opt_dead_method_elimination_verbose() && get_firm_verbosity() > 1) { printf("dead method elimination: freeing method %s\n", get_entity_ld_name(ent)); } }