1 /*
   2  * Copyright (c) 2015, 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.debug.instrumentation;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_IGNORED;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_IGNORED;
  27 
  28 import org.graalvm.compiler.core.common.type.StampFactory;
  29 import org.graalvm.compiler.graph.NodeClass;
  30 import org.graalvm.compiler.nodeinfo.InputType;
  31 import org.graalvm.compiler.nodeinfo.NodeInfo;
  32 import org.graalvm.compiler.nodes.ValueNode;
  33 import org.graalvm.compiler.nodes.calc.FloatingNode;
  34 import org.graalvm.compiler.nodes.java.MonitorIdNode;
  35 import org.graalvm.compiler.nodes.java.RawMonitorEnterNode;
  36 
  37 /**
  38  * The {@code MonitorProxyNode} represents the InstrumentationNode's target when the original
  39  * MonitorEnterNode is invalid. Such situation occurs when the escape analysis removes the
  40  * MonitorEnterNode and aggregates the monitor logic in a CommitAllocationNode.
  41  */
  42 @NodeInfo(cycles = CYCLES_IGNORED, size = SIZE_IGNORED)
  43 public class MonitorProxyNode extends FloatingNode {
  44 
  45     public static final NodeClass<MonitorProxyNode> TYPE = NodeClass.create(MonitorProxyNode.class);
  46 
  47     @OptionalInput(value = InputType.Unchecked) protected ValueNode object;
  48     @OptionalInput(value = InputType.Association) protected MonitorIdNode monitorId;
  49 
  50     public MonitorProxyNode(ValueNode object, MonitorIdNode monitorId) {
  51         super(TYPE, StampFactory.forVoid());
  52         this.object = object;
  53         this.monitorId = monitorId;
  54     }
  55 
  56     public ValueNode object() {
  57         return object;
  58     }
  59 
  60     public MonitorIdNode getMonitorId() {
  61         return monitorId;
  62     }
  63 
  64     /**
  65      * @return the first RawMonitorEnterNode that shares the same MonitorIdNode and the same lock
  66      *         object with this MonitorProxyNode.
  67      */
  68     public RawMonitorEnterNode findFirstMatch() {
  69         for (RawMonitorEnterNode monitorEnter : monitorId.usages().filter(RawMonitorEnterNode.class)) {
  70             if (monitorEnter.object() == object) {
  71                 return monitorEnter;
  72             }
  73         }
  74         return null;
  75     }
  76 
  77 }