1 /*
   2  * Copyright (c) 2009, 2016, 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.nodes.java;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_100;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_100;
  27 
  28 import org.graalvm.compiler.core.common.LocationIdentity;
  29 import org.graalvm.compiler.graph.IterableNodeType;
  30 import org.graalvm.compiler.graph.NodeClass;
  31 import org.graalvm.compiler.nodeinfo.NodeInfo;
  32 import org.graalvm.compiler.nodes.ValueNode;
  33 import org.graalvm.compiler.nodes.extended.MonitorEnter;
  34 import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
  35 import org.graalvm.compiler.nodes.spi.Lowerable;
  36 import org.graalvm.compiler.nodes.spi.LoweringTool;
  37 import org.graalvm.compiler.nodes.spi.Virtualizable;
  38 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
  39 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
  40 
  41 /**
  42  * The {@code MonitorEnterNode} represents the acquisition of a monitor.
  43  */
  44 @NodeInfo(cycles = CYCLES_100, size = SIZE_100)
  45 public class MonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {
  46 
  47     public static final NodeClass<MonitorEnterNode> TYPE = NodeClass.create(MonitorEnterNode.class);
  48 
  49     public MonitorEnterNode(ValueNode object, MonitorIdNode monitorId) {
  50         this(TYPE, object, monitorId);
  51     }
  52 
  53     public MonitorEnterNode(NodeClass<? extends MonitorEnterNode> c, ValueNode object, MonitorIdNode monitorId) {
  54         super(c, object, monitorId);
  55     }
  56 
  57     @Override
  58     public LocationIdentity getLocationIdentity() {
  59         return LocationIdentity.any();
  60     }
  61 
  62     @Override
  63     public void lower(LoweringTool tool) {
  64         tool.getLowerer().lower(this, tool);
  65     }
  66 
  67     @Override
  68     public void virtualize(VirtualizerTool tool) {
  69         ValueNode alias = tool.getAlias(object());
  70         if (alias instanceof VirtualObjectNode) {
  71             VirtualObjectNode virtual = (VirtualObjectNode) alias;
  72             if (virtual.hasIdentity()) {
  73                 tool.addLock(virtual, getMonitorId());
  74                 tool.delete();
  75             }
  76         }
  77     }
  78 }