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.hotspot.nodes;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
  27 
  28 import org.graalvm.compiler.core.common.type.StampFactory;
  29 import org.graalvm.compiler.graph.NodeClass;
  30 import org.graalvm.compiler.nodeinfo.NodeInfo;
  31 import org.graalvm.compiler.nodes.FixedWithNextNode;
  32 import org.graalvm.compiler.nodes.ValueNode;
  33 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  34 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  35 
  36 /**
  37  * Marks the control flow path where an object acquired a lightweight lock based on an atomic
  38  * compare-and-swap (CAS) of the mark word in the object's header.
  39  */
  40 @NodeInfo(cycles = CYCLES_0, size = SIZE_0)
  41 public final class AcquiredCASLockNode extends FixedWithNextNode implements LIRLowerable {
  42     public static final NodeClass<AcquiredCASLockNode> TYPE = NodeClass.create(AcquiredCASLockNode.class);
  43 
  44     @Input ValueNode object;
  45 
  46     public AcquiredCASLockNode(ValueNode object) {
  47         super(TYPE, StampFactory.forVoid());
  48         this.object = object;
  49     }
  50 
  51     public ValueNode object() {
  52         return object;
  53     }
  54 
  55     @Override
  56     public void generate(NodeLIRBuilderTool generator) {
  57         // This is just a marker node so it generates nothing
  58     }
  59 
  60     @NodeIntrinsic
  61     public static native void mark(Object object);
  62 }