Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/listener/StopWatchFuzzer.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.listener;
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19
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20 import gov.nasa.jpf.ListenerAdapter;
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21 import gov.nasa.jpf.jvm.bytecode.LCMP;
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22 import gov.nasa.jpf.jvm.bytecode.LSUB;
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23 import gov.nasa.jpf.jvm.bytecode.NATIVERETURN;
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24 import gov.nasa.jpf.vm.ClassInfo;
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25 import gov.nasa.jpf.vm.Instruction;
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26 import gov.nasa.jpf.vm.StackFrame;
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27 import gov.nasa.jpf.vm.VM;
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28 import gov.nasa.jpf.vm.MethodInfo;
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29 import gov.nasa.jpf.vm.ThreadInfo;
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30 import gov.nasa.jpf.vm.choice.IntChoiceFromSet;
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31
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32
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33 /**
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34 * a listener that is used to explore all paths from a time-value comparison.
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35 *
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36 * This works by creating a CG on LCMP instructions that involve
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37 * System.currentTimeMillis() obtained values, which are attribute tagged
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38 * upon return from the native method, propagated on LSUB (duration computation),
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39 * and finally used for LCMP interception if the tag attributes are present
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40 *
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41 * long t1 = System.currentTimeMillis();
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42 * doSomeComputation();
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43 * long t2 = System.currentTimeMillis();
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44 * if (t2 - t1 <= MAX_DURATION){
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45 * // all fine branch
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46 * } else {
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47 * // catastrophic failure branch
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48 * }
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49 *
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50 * which boils down to a bytecode pattern like
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51 *
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52 * invokestatic #2; // System.currentTimeMillis() <<< tag result with TimeVal attr
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53 * ..
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54 * lsub <<< propagate if any of the operands has a TimeVal attr
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55 * ..
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56 * lcmp <<< register CG and skip if any of the operands has TimeVal attr
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57 *
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58 */
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59 public class StopWatchFuzzer extends ListenerAdapter {
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60
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61 MethodInfo miCurrentTimeMillis;
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62
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63 static class TimeVal {
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64 // attribute for values obtained from System.currentTimeMillis()
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65 }
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66 static TimeVal timeValAttr = new TimeVal(); // we don't need separate instances
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67
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68 static String CG_ID = "LCMP_fuzzer";
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69
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70 @Override
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71 public void classLoaded(VM vm, ClassInfo ci){
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72 if (miCurrentTimeMillis == null){
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73 if (ci.getName().equals("java.lang.System")) {
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74 miCurrentTimeMillis = ci.getMethod("currentTimeMillis()J", false); // its got to be there
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75 }
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76 }
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77 }
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78
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79 @Override
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80 public void instructionExecuted(VM vm, ThreadInfo ti, Instruction nextInsn, Instruction executedInsn){
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81
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82 if (executedInsn instanceof NATIVERETURN){
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83 if (executedInsn.isCompleted(ti)){
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84 if (((NATIVERETURN)executedInsn).getMethodInfo() == miCurrentTimeMillis){
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85 // the two top operand slots hold the 'long' time value
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86 StackFrame frame = ti.getModifiableTopFrame();
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87 frame.addLongOperandAttr( timeValAttr);
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88 }
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89 }
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90 }
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91 }
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92
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93 @Override
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94 public void executeInstruction(VM vm, ThreadInfo ti, Instruction insnToExecute){
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95
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96 if (insnToExecute instanceof LSUB){ // propagate TimeVal attrs
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97 StackFrame frame = ti.getTopFrame();
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98 // check if any of the operands have TimeVal attributes
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99 // attributes are stored on the first slot of a long val
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100 if (frame.hasOperandAttr(1, TimeVal.class) || frame.hasOperandAttr(3, TimeVal.class)){
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101 // enter insn (this pops the 4 top operand slots and pushes the long result
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102 ti.skipInstruction(insnToExecute.execute(ti));
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103
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104 // propagate TimeVal attr, now we need a modifiable frame
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105 frame = ti.getModifiableTopFrame();
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106 frame.addLongOperandAttr(timeValAttr);
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107 }
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108
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109 } else if (insnToExecute instanceof LCMP){ // create and set CG if operand has TimeVal attr
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110
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111 if (!ti.isFirstStepInsn()){ // this is the first time we see this insn
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112 StackFrame frame = ti.getTopFrame();
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113
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114 if (frame.hasOperandAttr(1, TimeVal.class) || frame.hasOperandAttr(3, TimeVal.class)){
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115 IntChoiceFromSet cg = new IntChoiceFromSet( CG_ID, -1, 0, 1);
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116 if (vm.setNextChoiceGenerator(cg)){
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117 ti.skipInstruction(insnToExecute); // reexecute after breaking the transition
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118 }
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119 }
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120
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121 } else { // it is the beginning of a transition, push the choice and proceed
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122 IntChoiceFromSet cg = vm.getCurrentChoiceGenerator(CG_ID, IntChoiceFromSet.class);
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123 if (cg != null){
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124 int choice = cg.getNextChoice();
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125 StackFrame frame = ti.getModifiableTopFrame();
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126
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127 // pop the operands
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128 frame.popLong();
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129 frame.popLong();
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130
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131 frame.push(choice);
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132
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133 ti.skipInstruction(insnToExecute.getNext());
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134 }
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135 }
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136 }
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137 }
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138 }