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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/MembarNode.java @ 14950:d5a1206e1923

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NodeLIRBuilderTool: fix typo in interface name.
author Josef Eisl <josef.eisl@jku.at>
date Wed, 02 Apr 2014 17:53:06 +0200
parents f6630873316b
children 06e50d290784
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes.extended;
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25 import static com.oracle.graal.graph.UnsafeAccess.*;
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26
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27 import java.lang.reflect.*;
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28
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29 import sun.misc.*;
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30
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31 import com.oracle.graal.api.code.*;
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32 import com.oracle.graal.api.meta.*;
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33 import com.oracle.graal.graph.*;
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34 import com.oracle.graal.nodes.*;
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35 import com.oracle.graal.nodes.spi.*;
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36 import com.oracle.graal.nodes.type.*;
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37
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38 /**
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39 * Creates a memory barrier.
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40 */
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41 public class MembarNode extends FixedWithNextNode implements LIRLowerable, MemoryCheckpoint.Single {
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42
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43 private final int barriers;
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44
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45 /**
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46 * @param barriers a mask of the barrier constants defined in {@link MemoryBarriers}
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47 */
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48 public MembarNode(int barriers) {
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49 super(StampFactory.forVoid());
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50 this.barriers = barriers;
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51 }
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52
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53 @Override
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54 public LocationIdentity getLocationIdentity() {
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55 return LocationIdentity.ANY_LOCATION;
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56 }
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57
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58 @Override
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59 public void generate(NodeLIRBuilderTool generator) {
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60 generator.getLIRGeneratorTool().emitMembar(barriers);
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61 }
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62
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63 public MemoryCheckpoint asMemoryCheckpoint() {
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64 return this;
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65 }
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66
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67 public MemoryPhiNode asMemoryPhi() {
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68 return null;
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69 }
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70
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71 @SuppressWarnings("unused")
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72 @NodeIntrinsic
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73 public static void memoryBarrier(@ConstantNodeParameter int barriers) {
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74 // Overly conservative but it doesn't matter in the interpreter
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75 unsafe.putIntVolatile(dummyBase, dummyOffset, 0);
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76 unsafe.getIntVolatile(dummyBase, dummyOffset);
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77 }
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78
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79 /**
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80 * An unused field that it used to exercise barriers in the interpreter. This can be replaced
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81 * with direct support for barriers in {@link Unsafe} if/when they become available.
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82 */
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83 @SuppressWarnings("unused") private static int dummy;
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84 private static Object dummyBase;
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85 private static long dummyOffset;
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86 static {
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87 try {
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88 Field dummyField = MembarNode.class.getDeclaredField("dummy");
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89 dummyBase = unsafe.staticFieldBase(dummyField);
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90 dummyOffset = unsafe.staticFieldOffset(dummyField);
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91 } catch (Exception e) {
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92 throw new GraalInternalError(e);
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93 }
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94 }
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95 }