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_80;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_80;
  27 
  28 import org.graalvm.compiler.core.common.LocationIdentity;
  29 import org.graalvm.compiler.core.common.type.ObjectStamp;
  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 
  42 /**
  43  * The {@code RawMonitorEnterNode} represents the acquisition of a monitor. The object needs to
  44  * already be non-null and the hub is an additional parameter to the node.
  45  */
  46 // @formatter:off
  47 @NodeInfo(cycles = CYCLES_80,
  48           cyclesRationale = "Rough estimation of the enter operation",
  49           size = SIZE_80)
  50 // @formatter:on
  51 public final class RawMonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {
  52 
  53     public static final NodeClass<RawMonitorEnterNode> TYPE = NodeClass.create(RawMonitorEnterNode.class);
  54 
  55     @Input ValueNode hub;
  56 
  57     public RawMonitorEnterNode(ValueNode object, ValueNode hub, MonitorIdNode monitorId) {
  58         super(TYPE, object, monitorId);
  59         assert ((ObjectStamp) object.stamp()).nonNull();
  60         this.hub = hub;
  61     }
  62 
  63     @Override
  64     public LocationIdentity getLocationIdentity() {
  65         return LocationIdentity.any();
  66     }
  67 
  68     @Override
  69     public void lower(LoweringTool tool) {
  70         tool.getLowerer().lower(this, tool);
  71     }
  72 
  73     @Override
  74     public void virtualize(VirtualizerTool tool) {
  75         ValueNode alias = tool.getAlias(object());
  76         if (alias instanceof VirtualObjectNode) {
  77             VirtualObjectNode virtual = (VirtualObjectNode) alias;
  78             if (virtual.hasIdentity()) {
  79                 tool.addLock(virtual, getMonitorId());
  80                 tool.delete();
  81             }
  82         }
  83     }
  84 
  85     public ValueNode getHub() {
  86         return hub;
  87     }
  88 }