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.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.extended.*;
032import com.oracle.graal.nodes.memory.*;
033import com.oracle.graal.nodes.spi.*;
034import com.oracle.graal.nodes.virtual.*;
035
036/**
037 * The {@code MonitorEnterNode} represents the acquisition of a monitor. The object needs already be
038 * non-null and the hub is an additional parameter to the node.
039 */
040@NodeInfo
041public final class RawMonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {
042
043    public static final NodeClass<RawMonitorEnterNode> TYPE = NodeClass.create(RawMonitorEnterNode.class);
044
045    @Input ValueNode hub;
046
047    public RawMonitorEnterNode(ValueNode object, ValueNode hub, MonitorIdNode monitorId) {
048        super(TYPE, object, monitorId);
049        assert ((ObjectStamp) object.stamp()).nonNull();
050        this.hub = hub;
051    }
052
053    @Override
054    public LocationIdentity getLocationIdentity() {
055        return LocationIdentity.any();
056    }
057
058    @Override
059    public void lower(LoweringTool tool) {
060        tool.getLowerer().lower(this, tool);
061    }
062
063    @Override
064    public void virtualize(VirtualizerTool tool) {
065        ValueNode alias = tool.getAlias(object());
066        if (alias instanceof VirtualObjectNode) {
067            VirtualObjectNode virtual = (VirtualObjectNode) alias;
068            if (virtual.hasIdentity()) {
069                tool.addLock(virtual, getMonitorId());
070                tool.delete();
071            }
072        }
073    }
074
075    public ValueNode getHub() {
076        return hub;
077    }
078}