1/* 2 * Copyright (c) 2009, 2015, 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 */ 23package org.graalvm.compiler.nodes.java; 24 25import org.graalvm.compiler.core.common.type.StampFactory; 26import org.graalvm.compiler.graph.NodeClass; 27import org.graalvm.compiler.nodeinfo.InputType; 28import org.graalvm.compiler.nodeinfo.NodeInfo; 29import org.graalvm.compiler.nodes.DeoptimizingNode; 30import org.graalvm.compiler.nodes.FrameState; 31import org.graalvm.compiler.nodes.ValueNode; 32import org.graalvm.compiler.nodes.memory.AbstractMemoryCheckpoint; 33import org.graalvm.compiler.nodes.memory.MemoryCheckpoint; 34 35import jdk.vm.ci.code.BailoutException; 36 37/** 38 * The {@code AccessMonitorNode} is the base class of both monitor acquisition and release. 39 * <p> 40 * The Java bytecode specification allows non-balanced locking. Graal does not handle such cases and 41 * throws a {@link BailoutException} instead during graph building. 42 */ 43@NodeInfo(allowedUsageTypes = {InputType.Memory}) 44public abstract class AccessMonitorNode extends AbstractMemoryCheckpoint implements MemoryCheckpoint, DeoptimizingNode.DeoptBefore, DeoptimizingNode.DeoptAfter { 45 46 public static final NodeClass<AccessMonitorNode> TYPE = NodeClass.create(AccessMonitorNode.class); 47 @OptionalInput(InputType.State) FrameState stateBefore; 48 @Input ValueNode object; 49 @Input(InputType.Association) MonitorIdNode monitorId; 50 51 @Override 52 public boolean canDeoptimize() { 53 return true; 54 } 55 56 @Override 57 public FrameState stateBefore() { 58 return stateBefore; 59 } 60 61 @Override 62 public void setStateBefore(FrameState f) { 63 updateUsages(stateBefore, f); 64 stateBefore = f; 65 } 66 67 public ValueNode object() { 68 return object; 69 } 70 71 public MonitorIdNode getMonitorId() { 72 return monitorId; 73 } 74 75 /** 76 * Creates a new AccessMonitor instruction. 77 * 78 * @param object the instruction producing the object 79 */ 80 protected AccessMonitorNode(NodeClass<? extends AccessMonitorNode> c, ValueNode object, MonitorIdNode monitorId) { 81 super(c, StampFactory.forVoid()); 82 this.object = object; 83 this.monitorId = monitorId; 84 } 85} 86