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annotate src/tests/gov/nasa/jpf/test/mc/threads/MissedPathTest.java @ 0:61d41facf527

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author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18 package gov.nasa.jpf.test.mc.threads;
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19
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20 import org.junit.Test;
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21
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22 import gov.nasa.jpf.util.test.TestJPF;
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23 import gov.nasa.jpf.vm.Verify;
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24
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25 /**
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26 * test for missed paths in concurrent threads with very little interaction
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27 */
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28 public class MissedPathTest extends TestJPF {
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29
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30 static class X {
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31 boolean pass;
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32 }
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33
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34 static class InstanceFieldPropagation extends Thread {
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35 X myX; // initially not set
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36
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37 @Override
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38 public void run() {
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39 if (myX != null){
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40 Verify.println("T: accessed global myX");
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41 if (!myX.pass){ // (2) won't fail unless main is between (0) and (1)
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42 throw new AssertionError("gotcha");
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43 }
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44 }
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45 }
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46 }
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47
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48 @Test
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49 public void testInstanceFieldPropagation () {
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50 if (verifyAssertionErrorDetails("gotcha", "+vm.shared.break_on_exposure=true")) {
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51 InstanceFieldPropagation mp = new InstanceFieldPropagation();
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52 mp.start();
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53
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54 X x = new X();
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55 Verify.println("M: new " + x);
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56 mp.myX = x; // (0) exposure - x cannot become shared until this GOT executed
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57
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58 //Thread.yield(); // this would expose the error
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59 Verify.println("M: x.pass=true");
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60 x.pass = true; // (1) need to break BEFORE assignment or no error
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61 }
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62 }
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63
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64 //----------------------------------------------------------------------------------
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65
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66 static class Y {
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67 X x;
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68 }
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69
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70 static Y globalY; // initially not set
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71
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72 static class StaticFieldPropagation extends Thread {
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73 @Override
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74 public void run(){
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75 if (globalY != null){
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76 if (!globalY.x.pass){ // (2) won't fail unless main is between (0) and (1)
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77 throw new AssertionError("gotcha");
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78 }
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79 }
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80 }
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81 }
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82
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83 @Test
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84 public void testStaticFieldPropagation () {
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85 if (verifyAssertionErrorDetails("gotcha", "+vm.shared.break_on_exposure=true")) {
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86 StaticFieldPropagation mp = new StaticFieldPropagation();
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87 mp.start();
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88
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89 X x = new X();
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90 Y y = new Y();
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91 y.x = x;
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92
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93 globalY = y; // (0) x not shared until this GOT executed
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94
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95 //Thread.yield(); // this would expose the error
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96 x.pass = true; // (1) need to break BEFORE assignment or no error
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97 }
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98 }
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99
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100 //-------------------------------------------------------------------------------
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101
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102 static class PutContender extends Thread {
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103 X myX;
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104
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105 @Override
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106 public void run () {
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107 myX = new X(); // competing put with exposure
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108
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109 if (myX != null) { // doesn't matter, we just want to GET myX
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110 Verify.println("T: accessed global myX");
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111 }
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112 }
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113 }
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114
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115 // this does not really belong here since it doesn't test not missing paths, but
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116 // if the exposure CGs we use to avoid missing paths are not causing infinite loops.
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117 // NOTE: turning off state matching is crucial here
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118 @Test
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119 public void testCompetingExposures(){
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120 if (verifyNoPropertyViolation("+vm.storage.class=nil")){
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121 PutContender mp = new PutContender();
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122 mp.start();
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123
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124 X x = new X();
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125 Verify.println("M: new " + x);
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126 mp.myX = x; // this is one of the competing PUTs
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127
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128 Verify.println("M: x.pass=true");
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129 x.pass = true; // irrelevant in this case
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130 }
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131 }
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132 }