1 /*
2  * Copyright (c) 2009, 2019, 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 
24 
25 package org.graalvm.compiler.nodes.java;
26 
27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_64;
28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_64;
29 
30 import org.graalvm.compiler.graph.IterableNodeType;
31 import org.graalvm.compiler.graph.NodeClass;
32 import org.graalvm.compiler.nodeinfo.NodeInfo;
33 import org.graalvm.compiler.nodes.ValueNode;
34 import org.graalvm.compiler.nodes.extended.MonitorEnter;
35 import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
36 import org.graalvm.compiler.nodes.spi.Lowerable;
37 import org.graalvm.compiler.nodes.spi.LoweringTool;
38 import org.graalvm.compiler.nodes.spi.Virtualizable;
39 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
40 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
41 import jdk.internal.vm.compiler.word.LocationIdentity;
42 
43 /**
44  * The {@code MonitorEnterNode} represents the acquisition of a monitor.
45  */
46 @NodeInfo(cycles = CYCLES_64, size = SIZE_64)
47 public class MonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {
48 
49     public static final NodeClass<MonitorEnterNode> TYPE = NodeClass.create(MonitorEnterNode.class);
50 
MonitorEnterNode(ValueNode object, MonitorIdNode monitorId)51     public MonitorEnterNode(ValueNode object, MonitorIdNode monitorId) {
52         this(TYPE, object, monitorId);
53     }
54 
MonitorEnterNode(NodeClass<? extends MonitorEnterNode> c, ValueNode object, MonitorIdNode monitorId)55     public MonitorEnterNode(NodeClass<? extends MonitorEnterNode> c, ValueNode object, MonitorIdNode monitorId) {
56         super(c, object, monitorId);
57     }
58 
59     @Override
getKilledLocationIdentity()60     public LocationIdentity getKilledLocationIdentity() {
61         return LocationIdentity.any();
62     }
63 
64     @Override
lower(LoweringTool tool)65     public void lower(LoweringTool tool) {
66         tool.getLowerer().lower(this, tool);
67     }
68 
69     @Override
virtualize(VirtualizerTool tool)70     public void virtualize(VirtualizerTool tool) {
71         ValueNode alias = tool.getAlias(object());
72         if (alias instanceof VirtualObjectNode) {
73             VirtualObjectNode virtual = (VirtualObjectNode) alias;
74             if (virtual.hasIdentity()) {
75                 tool.addLock(virtual, getMonitorId());
76                 tool.delete();
77             }
78         }
79     }
80 }
81