1 /* 2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.phases.common; 24 25 import org.graalvm.compiler.nodes.FixedNode; 26 import org.graalvm.compiler.nodes.StructuredGraph; 27 import org.graalvm.compiler.nodes.java.AccessMonitorNode; 28 import org.graalvm.compiler.nodes.java.MonitorEnterNode; 29 import org.graalvm.compiler.nodes.java.MonitorExitNode; 30 import org.graalvm.compiler.nodes.java.RawMonitorEnterNode; 31 import org.graalvm.compiler.nodes.util.GraphUtil; 32 import org.graalvm.compiler.phases.Phase; 33 34 public class LockEliminationPhase extends Phase { 35 36 @Override 37 protected void run(StructuredGraph graph) { 38 for (MonitorExitNode node : graph.getNodes(MonitorExitNode.TYPE)) { 39 FixedNode next = node.next(); 40 if (next instanceof MonitorEnterNode || next instanceof RawMonitorEnterNode) { 41 AccessMonitorNode monitorEnterNode = (AccessMonitorNode) next; 42 if (GraphUtil.unproxify(monitorEnterNode.object()) == GraphUtil.unproxify(node.object())) { 43 GraphUtil.removeFixedWithUnusedInputs(monitorEnterNode); 44 GraphUtil.removeFixedWithUnusedInputs(node); 45 } 46 } 47 } 48 } 49 }