1 /*
   2  * Copyright (c) 2014, 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_10;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_4;
  27 
  28 import org.graalvm.compiler.core.common.LocationIdentity;
  29 import org.graalvm.compiler.core.common.type.StampFactory;
  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.memory.AbstractMemoryCheckpoint;
  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 
  38 import jdk.vm.ci.meta.JavaKind;
  39 import sun.misc.Unsafe;
  40 
  41 /**
  42  * Represents an atomic read-and-write operation like {@link Unsafe#getAndSetInt(Object, long, int)}
  43  * .
  44  */
  45 @NodeInfo(cycles = CYCLES_10, size = SIZE_4)
  46 public final class AtomicReadAndWriteNode extends AbstractMemoryCheckpoint implements Lowerable, MemoryCheckpoint.Single {
  47 
  48     public static final NodeClass<AtomicReadAndWriteNode> TYPE = NodeClass.create(AtomicReadAndWriteNode.class);
  49     @Input ValueNode object;
  50     @Input ValueNode offset;
  51     @Input ValueNode newValue;
  52 
  53     protected final JavaKind valueKind;
  54     protected final LocationIdentity locationIdentity;
  55 
  56     public AtomicReadAndWriteNode(ValueNode object, ValueNode offset, ValueNode newValue, JavaKind valueKind, LocationIdentity locationIdentity) {
  57         super(TYPE, StampFactory.forKind(newValue.getStackKind()));
  58         this.object = object;
  59         this.offset = offset;
  60         this.newValue = newValue;
  61         this.valueKind = valueKind;
  62         this.locationIdentity = locationIdentity;
  63     }
  64 
  65     public ValueNode object() {
  66         return object;
  67     }
  68 
  69     public ValueNode offset() {
  70         return offset;
  71     }
  72 
  73     public ValueNode newValue() {
  74         return newValue;
  75     }
  76 
  77     public JavaKind getValueKind() {
  78         return valueKind;
  79     }
  80 
  81     @Override
  82     public LocationIdentity getLocationIdentity() {
  83         return locationIdentity;
  84     }
  85 
  86     @Override
  87     public void lower(LoweringTool tool) {
  88         tool.getLowerer().lower(this, tool);
  89     }
  90 }