1 /*
   2  * Copyright (c) 2009, 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.java;
  24 
  25 import org.graalvm.compiler.core.common.type.StampFactory;
  26 import org.graalvm.compiler.graph.NodeClass;
  27 import org.graalvm.compiler.nodeinfo.InputType;
  28 import org.graalvm.compiler.nodeinfo.NodeInfo;
  29 import org.graalvm.compiler.nodes.DeoptimizingNode;
  30 import org.graalvm.compiler.nodes.FrameState;
  31 import org.graalvm.compiler.nodes.ValueNode;
  32 import org.graalvm.compiler.nodes.memory.AbstractMemoryCheckpoint;
  33 import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
  34 
  35 import jdk.vm.ci.code.BailoutException;
  36 
  37 /**
  38  * The {@code AccessMonitorNode} is the base class of both monitor acquisition and release.
  39  * <p>
  40  * The Java bytecode specification allows non-balanced locking. Graal does not handle such cases and
  41  * throws a {@link BailoutException} instead during graph building.
  42  */
  43 @NodeInfo(allowedUsageTypes = {InputType.Memory})
  44 public abstract class AccessMonitorNode extends AbstractMemoryCheckpoint implements MemoryCheckpoint, DeoptimizingNode.DeoptBefore, DeoptimizingNode.DeoptAfter {
  45 
  46     public static final NodeClass<AccessMonitorNode> TYPE = NodeClass.create(AccessMonitorNode.class);
  47     @OptionalInput(InputType.State) FrameState stateBefore;
  48     @Input ValueNode object;
  49     @Input(InputType.Association) MonitorIdNode monitorId;
  50 
  51     @Override
  52     public boolean canDeoptimize() {
  53         return true;
  54     }
  55 
  56     @Override
  57     public FrameState stateBefore() {
  58         return stateBefore;
  59     }
  60 
  61     @Override
  62     public void setStateBefore(FrameState f) {
  63         updateUsages(stateBefore, f);
  64         stateBefore = f;
  65     }
  66 
  67     public ValueNode object() {
  68         return object;
  69     }
  70 
  71     public MonitorIdNode getMonitorId() {
  72         return monitorId;
  73     }
  74 
  75     /**
  76      * Creates a new AccessMonitor instruction.
  77      *
  78      * @param object the instruction producing the object
  79      */
  80     protected AccessMonitorNode(NodeClass<? extends AccessMonitorNode> c, ValueNode object, MonitorIdNode monitorId) {
  81         super(c, StampFactory.forVoid());
  82         this.object = object;
  83         this.monitorId = monitorId;
  84     }
  85 }