001/*
002 * Copyright (c) 2009, 2015, 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.nodes.java;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.graph.*;
028import com.oracle.graal.nodeinfo.*;
029import com.oracle.graal.nodes.*;
030import com.oracle.graal.nodes.extended.*;
031import com.oracle.graal.nodes.memory.*;
032import com.oracle.graal.nodes.spi.*;
033import com.oracle.graal.nodes.virtual.*;
034
035/**
036 * The {@code MonitorEnterNode} represents the acquisition of a monitor.
037 */
038@NodeInfo
039public final class MonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {
040
041    public static final NodeClass<MonitorEnterNode> TYPE = NodeClass.create(MonitorEnterNode.class);
042
043    public MonitorEnterNode(ValueNode object, MonitorIdNode monitorId) {
044        super(TYPE, object, monitorId);
045    }
046
047    @Override
048    public LocationIdentity getLocationIdentity() {
049        return LocationIdentity.any();
050    }
051
052    @Override
053    public void lower(LoweringTool tool) {
054        tool.getLowerer().lower(this, tool);
055    }
056
057    @Override
058    public void virtualize(VirtualizerTool tool) {
059        ValueNode alias = tool.getAlias(object());
060        if (alias instanceof VirtualObjectNode) {
061            VirtualObjectNode virtual = (VirtualObjectNode) alias;
062            if (virtual.hasIdentity()) {
063                tool.addLock(virtual, getMonitorId());
064                tool.delete();
065            }
066        }
067    }
068}