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annotate graal/com.oracle.graal.compiler.test/src/com/oracle/graal/compiler/test/ReadAfterCheckCastTest.java @ 9267:950a385e059b
Make LoweringPhase reentrant.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 23 Apr 2013 17:49:10 +0200 |
parents | 223e01540fe8 |
children | 6f8d76dbe874 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2013, 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.compiler.test; |
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24 |
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25 import java.util.*; |
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26 |
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27 import org.junit.*; |
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28 |
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29 import com.oracle.graal.api.code.*; |
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30 import com.oracle.graal.debug.*; |
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31 import com.oracle.graal.graph.*; |
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32 import com.oracle.graal.nodes.*; |
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33 import com.oracle.graal.nodes.calc.*; |
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34 import com.oracle.graal.nodes.extended.*; |
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35 import com.oracle.graal.nodes.spi.Lowerable.*; |
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36 import com.oracle.graal.phases.common.*; |
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37 import com.oracle.graal.phases.tiers.*; |
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38 |
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39 /* consider |
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40 * B b = (B) a; |
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41 * return b.x10; |
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42 * |
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43 * With snippets a typecheck is performed and if it was successful, a UnsafeCastNode is created. |
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44 * For the read node, however, there is only a dependency to the UnsafeCastNode, but not to the |
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45 * typecheck itself. With special crafting, it's possible to get the scheduler moving the |
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46 * FloatingReadNode before the typecheck. Assuming the object is of the wrong type (here for |
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47 * example A), an invalid field read is done. |
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48 * |
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49 * In order to avoid this situation, an anchor node is introduced in CheckCastSnippts. |
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50 */ |
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51 |
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52 public class ReadAfterCheckCastTest extends GraphScheduleTest { |
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53 |
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54 public static long foo = 0; |
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55 |
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56 public static class A { |
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57 |
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58 public long x1; |
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59 } |
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60 |
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61 public static class B extends A { |
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62 |
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63 public long x10; |
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64 } |
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65 |
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66 public static long test1Snippet(A a) { |
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67 if (foo > 4) { |
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68 B b = (B) a; |
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69 b.x10 += 1; |
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70 return b.x10; |
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71 } else { |
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72 B b = (B) a; |
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73 b.x10 += 1; |
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74 return b.x10; |
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75 } |
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76 } |
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77 |
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78 @Test |
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79 public void test1() { |
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80 test("test1Snippet"); |
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81 } |
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82 |
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83 private void test(final String snippet) { |
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84 Debug.scope("FloatingReadTest", new DebugDumpScope(snippet), new Runnable() { |
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85 |
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86 // check shape of graph, with lots of assumptions. will probably fail if graph |
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87 // structure changes significantly |
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88 public void run() { |
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89 StructuredGraph graph = parse(snippet); |
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90 HighTierContext context = new HighTierContext(runtime(), new Assumptions(false), replacements); |
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91 new LoweringPhase(LoweringType.BEFORE_GUARDS).apply(graph, context); |
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92 new FloatingReadPhase().apply(graph); |
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93 new EliminatePartiallyRedundantGuardsPhase(true, false).apply(graph); |
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94 new ReadEliminationPhase().apply(graph); |
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95 new CanonicalizerPhase().apply(graph, context); |
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96 |
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97 Debug.dump(graph, "After lowering"); |
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98 |
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99 ArrayList<MergeNode> merges = new ArrayList<>(); |
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100 ArrayList<FloatingReadNode> reads = new ArrayList<>(); |
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101 for (Node n : graph.getNodes()) { |
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102 if (n instanceof MergeNode) { |
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103 // check shape |
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104 MergeNode merge = (MergeNode) n; |
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105 |
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106 if (merge.inputs().count() == 2) { |
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107 for (EndNode m : merge.forwardEnds()) { |
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108 if (m.predecessor() != null && m.predecessor() instanceof BeginNode && m.predecessor().predecessor() instanceof IfNode) { |
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109 IfNode o = (IfNode) m.predecessor().predecessor(); |
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110 if (o.falseSuccessor().next() instanceof DeoptimizeNode) { |
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111 merges.add(merge); |
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112 } |
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113 } |
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114 } |
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115 } |
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116 } |
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117 if (n instanceof IntegerAddNode) { |
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118 IntegerAddNode ian = (IntegerAddNode) n; |
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119 |
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120 Assert.assertTrue(ian.y() instanceof ConstantNode); |
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121 Assert.assertTrue(ian.x() instanceof FloatingReadNode); |
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122 reads.add((FloatingReadNode) ian.x()); |
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123 } |
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124 } |
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125 |
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126 Assert.assertTrue(merges.size() >= reads.size()); |
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127 for (int i = 0; i < reads.size(); i++) { |
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128 assertOrderedAfterSchedule(graph, merges.get(i), reads.get(i)); |
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129 } |
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130 } |
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131 }); |
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132 } |
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133 } |