Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/listener/InsnCounter.java @ 0:61d41facf527

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initial v8 import (history reset)
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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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.search.Search;
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22 import gov.nasa.jpf.vm.Instruction;
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23 import gov.nasa.jpf.vm.ThreadInfo;
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24 import gov.nasa.jpf.vm.VM;
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25
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26 /**
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27 * simple tools to gather statistics about instructions executed by JPF.
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28 * InsnCounter is mostly a VMListener that observes 'instructionExecuted'
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29 */
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30 public class InsnCounter extends ListenerAdapter {
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31
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32 String[] opCodes = new String[500];
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33 int[] counts = new int[500];
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34 int total;
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35
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36 //----------------------------------------- SearchKistener interface
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37 @Override
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38 public void searchFinished(Search search) {
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39 reportStatistics();
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40 }
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41
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42 //----------------------------------------------------- VMListener interface
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43 @Override
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44 public void instructionExecuted(VM vm, ThreadInfo ti, Instruction nextInsn, Instruction executedInsn) {
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45 int bc = executedInsn.getByteCode();
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46
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47 if (opCodes[bc] == null) {
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48 opCodes[bc] = executedInsn.getMnemonic();
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49 }
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50 counts[bc]++;
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51 total++;
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52 }
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53
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54
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55 //----------------------------------------------------- internal stuff
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56 void reportStatistics () {
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57 int[] sorted = getSortedCounts();
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58 int i;
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59
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60 int total = 0;
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61
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62 for (i=0; i<sorted.length; i++) {
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63 int idx = sorted[i];
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64 String opc = opCodes[idx];
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65
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66 if (counts[idx] > 0) {
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67 System.out.print( i);
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68 System.out.print( " ");
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69 System.out.print( opc);
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70 System.out.print( " : ");
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71 System.out.println( counts[idx]);
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72
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73 total += counts[idx];
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74 } else {
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75 break;
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76 }
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77 }
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78
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79 System.out.println();
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80 System.out.println("total number of executed instructions: " + total);
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81 }
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82
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83 int[] getSortedCounts () {
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84 int[] sorted = new int[256];
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85 int last = -1;
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86 int i, j;
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87
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88 for (i=0; i<256; i++) {
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89 int c = counts[i];
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90 if (c > 0) {
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91 for (j=0; j<last; j++) {
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92 if (counts[sorted[j]] < c) {
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93 System.arraycopy(sorted, j, sorted, j+1, (last-j));
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94 break;
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95 }
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96 }
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97 sorted[j] = i;
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98 last++;
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99 }
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100 }
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101
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102 return sorted;
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103 }
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104
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105 void filterArgs (String[] args) {
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106 // we don't have any yet
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107 }
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108 }
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109