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annotate src/tests/gov/nasa/jpf/test/mc/basic/CascadedCGTest.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
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19 package gov.nasa.jpf.test.mc.basic;
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20
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21
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22 import gov.nasa.jpf.ListenerAdapter;
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23 import gov.nasa.jpf.jvm.bytecode.EXECUTENATIVE;
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24 import gov.nasa.jpf.jvm.bytecode.GETFIELD;
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25 import gov.nasa.jpf.search.Search;
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26 import gov.nasa.jpf.util.test.TestJPF;
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27 import gov.nasa.jpf.vm.ChoiceGenerator;
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28 import gov.nasa.jpf.vm.FieldInfo;
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29 import gov.nasa.jpf.vm.Instruction;
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30 import gov.nasa.jpf.vm.VM;
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31 import gov.nasa.jpf.vm.StackFrame;
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32 import gov.nasa.jpf.vm.SystemState;
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33 import gov.nasa.jpf.vm.ThreadInfo;
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34 import gov.nasa.jpf.vm.Verify;
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35 import gov.nasa.jpf.vm.choice.IntChoiceFromSet;
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36 import gov.nasa.jpf.vm.choice.IntIntervalGenerator;
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37
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38 import org.junit.Test;
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39
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40 /**
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41 * regression test for cascaded ChoiceGenerators
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42 */
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43 public class CascadedCGTest extends TestJPF {
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44
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45 public static class IntChoiceCascader extends ListenerAdapter {
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46 static int result;
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47
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48 @Override
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49 public void instructionExecuted(VM vm, ThreadInfo ti, Instruction nextInsn, Instruction executedInsn) {
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50 SystemState ss = vm.getSystemState();
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51
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52 if (executedInsn instanceof EXECUTENATIVE) { // break on native method exec
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53 EXECUTENATIVE exec = (EXECUTENATIVE) executedInsn;
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54
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55 if (exec.getExecutedMethodName().equals("getInt")){// this insn did create a CG
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56 if (!ti.isFirstStepInsn()){
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57 result = 0;
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58
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59 IntIntervalGenerator cg = new IntIntervalGenerator("listenerCG", 3,4);
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60 ss.setNextChoiceGenerator(cg);
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61 System.out.println("# listener registered " + cg);
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62
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63 } else { // reexecution
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64
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65 ChoiceGenerator<?>[] curCGs = ss.getCurrentChoiceGenerators();
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66 assert curCGs.length == 2;
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67
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68 IntIntervalGenerator cg = ss.getCurrentChoiceGenerator("listenerCG", IntIntervalGenerator.class);
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69 assert cg != null : "no 'listenerCG' IntIntervalGenerator found";
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70 int i = cg.getNextChoice();
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71 System.out.println("# current listener CG choice: " + i);
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72
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73 cg = ss.getCurrentChoiceGenerator("verifyGetInt(II)", IntIntervalGenerator.class);
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74 assert cg != null : "no 'verifyGetInt(II)' IntIntervalGenerator found";
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75 int j = cg.getNextChoice();
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76 System.out.println("# current insn CG choice: " + j);
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77
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78 result += i * j;
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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 }
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84
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85 @Test
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86 public void testCascadedIntIntervals () {
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87 if (verifyNoPropertyViolation("+listener=.test.mc.basic.CascadedCGTest$IntChoiceCascader")){
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88 int i = Verify.getInt( 1, 2);
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89 System.out.print("i=");
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90 System.out.println(i);
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91 } else {
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92 assert IntChoiceCascader.result == 21;
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93 }
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94 }
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95
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96
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97 //--- mixed data and thread CG
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98
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99 // this listener replaces all GETFIELD "mySharedField" results with configured
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100 // choice values (i.e. it is a simplified field Perturbator).
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101 // The demo point is that it is not aware of that such GETFIELDs might also be
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102 // scheduling points because of shared object field access, and it should work
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103 // the same no matter if there also was a ThreadChoice/context switch or not
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104
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105 // NOTE: while the cascaded CG interface is easy to use (almost the same as the
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106 // single CG interface), the context can be quite tricky because the cascaded
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107 // CG (the scheduling point in this case) means the corresponding instruction
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108 // is already rescheduled and might have been cut short in insn specific ways
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109 // (in this case before pushing the field value on the operand stack). For this
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110 // reason a simple ti.isFirstStepInsn() check is not sufficient. There might not
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111 // have been a reschedule if there was only one thread, or even if this is the
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112 // first step insn, the corresponding CG might have been not related to the
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113 // getfield but some action in the preceeding thread (e.g. a terminate).
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114 // In this case, the simple solution is based on that we want the data CG
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115 // unconditionally, so we check if there is a corresponding current CG
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116 // (which means this is not the first step insn)
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117
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118 public static class FieldAccessCascader extends ListenerAdapter {
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119
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120 @Override
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121 public void instructionExecuted(VM vm, ThreadInfo ti, Instruction nextInsn, Instruction executedInsn) {
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122 SystemState ss = vm.getSystemState();
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123
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124 if (executedInsn instanceof GETFIELD){
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125 GETFIELD getInsn = (GETFIELD) executedInsn;
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126 FieldInfo fi = getInsn.getFieldInfo();
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127 if (fi.getName().equals("mySharedField")){
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128
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129 IntChoiceFromSet cg = ss.getCurrentChoiceGenerator("fieldReplace", IntChoiceFromSet.class);
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130 if (cg == null){
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131
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132 // we might get here after a preceding rescheduling exec, i.e.
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133 // partial execution (with successive re-execution), or after
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134 // non-rescheduling exec has been completed (only one runnable thread).
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135 // In the first case we have to restore the operand stack so that
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136 // we can reexecute
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137 if (!ti.willReExecuteInstruction()){
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138 // restore old operand stack contents
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139 StackFrame frame = ti.getModifiableTopFrame();
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140
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141 frame.pop();
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142 frame.pushRef( getInsn.getLastThis());
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143 }
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144
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145 cg = new IntChoiceFromSet("fieldReplace", 42, 43);
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146 ss.setNextChoiceGenerator(cg);
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147 ti.reExecuteInstruction();
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148
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149 System.out.println("# listener registered CG: " + cg);
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150
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151 } else {
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152 StackFrame frame = ti.getModifiableTopFrame();
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153
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154 int v = cg.getNextChoice();
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155 int n = frame.pop();
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156 frame.push(v);
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157
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158 System.out.println("# listener replacing " + n + " with " + v);
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159 }
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160 }
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161 }
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162 }
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163
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164 //--- those are just for debugging purposes
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165 @Override
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166 public void stateBacktracked(Search search) {
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167 System.out.println("#------ [" + search.getDepth() + "] backtrack: " + search.getStateId());
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168 }
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169
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170 @Override
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171 public void stateAdvanced(Search search){
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172 System.out.println("#------ " + search.getStateId() + " isNew: " + search.isNewState() + ", isEnd: " + search.isEndState());
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173 }
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174
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175 @Override
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176 public void threadScheduled(VM vm, ThreadInfo ti){
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177 System.out.println("# running thread: " + ti);
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178 }
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179
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180 @Override
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181 public void threadTerminated(VM vm, ThreadInfo ti){
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182 System.out.println("# terminated thread: " + ti);
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183 }
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184
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185 @Override
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186 public void threadStarted(VM vm, ThreadInfo ti){
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187 System.out.println("# started thread: " + ti);
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188 }
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189
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190 @Override
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191 public void choiceGeneratorAdvanced (VM vm, ChoiceGenerator<?> currentCG) {
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192 System.out.println("# choice: " + currentCG);
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193 }
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194 }
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195
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196 int mySharedField = -1;
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197
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198 @Test
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199 public void testMixedThreadDataCGs () {
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200 if (verifyNoPropertyViolation("+listener=.test.mc.basic.CascadedCGTest$FieldAccessCascader")){
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201 Thread t = new Thread(){
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202 @Override
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203 public void run() {
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204 int n = mySharedField;
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205 System.out.print("<thread> mySharedField read: ");
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206 System.out.println( n);
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207 assert n == 42 || n == 43; // regardless of main thread exec state
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208 }
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209 };
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210 t.start();
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211
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212 mySharedField = 7;
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213 System.out.println("<main> mySharedField write: 7");
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214 }
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215 }
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216 }