001/*
002 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.phases.common;
024
025import com.oracle.graal.nodes.*;
026import com.oracle.graal.nodes.java.*;
027import com.oracle.graal.nodes.util.*;
028import com.oracle.graal.phases.*;
029
030public class LockEliminationPhase extends Phase {
031
032    @Override
033    protected void run(StructuredGraph graph) {
034        for (MonitorExitNode node : graph.getNodes(MonitorExitNode.TYPE)) {
035            FixedNode next = node.next();
036            if (next instanceof MonitorEnterNode || next instanceof RawMonitorEnterNode) {
037                AccessMonitorNode monitorEnterNode = (AccessMonitorNode) next;
038                if (GraphUtil.unproxify(monitorEnterNode.object()) == GraphUtil.unproxify(node.object())) {
039                    GraphUtil.removeFixedWithUnusedInputs(monitorEnterNode);
040                    GraphUtil.removeFixedWithUnusedInputs(node);
041                }
042            }
043        }
044    }
045}