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annotate src/main/gov/nasa/jpf/vm/Step.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.vm;
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19
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20 import gov.nasa.jpf.util.Source;
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21
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22 import java.util.WeakHashMap;
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23
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24 /**
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25 * this corresponds to an executed instruction. Note that we can have a
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26 * potentially huge number of Steps, hence we want to save objects here
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27 * (e.g. Collection overhead)
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28 */
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29 public class Step {
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30
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31 private static WeakHashMap<Step, String> s_comments = new WeakHashMap<Step, String>(); // Not every Step gets a comment. So save memory and put comments in a global comment HashMap. Make this a WeakHashMap so that old Step objects can be GCed.
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32
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33 private final Instruction insn;
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34 Step next;
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35
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36 public Step (Instruction insn) {
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37 if (insn == null)
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38 throw new IllegalArgumentException("insn == null");
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39
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40 this.insn = insn;
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41 }
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42
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43 public Step getNext() {
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44 return next;
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45 }
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46
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47 public Instruction getInstruction() {
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48 return insn;
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49 }
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50
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51 public void setComment (String s) {
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52 s_comments.put(this, s);
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53 }
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54
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55 public String getComment () {
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56 return s_comments.get(this);
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57 }
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58
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59 public String getLineString () {
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60 MethodInfo mi = insn.getMethodInfo();
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61 if (mi != null) {
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62 Source source = Source.getSource(mi.getSourceFileName());
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63 if (source != null) {
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64 int line = mi.getLineNumber(insn);
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65 if (line > 0) {
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66 return source.getLine(line);
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67 }
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68 }
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69 }
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70
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71 return null;
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72 }
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73
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74 public boolean sameSourceLocation (Step other){
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75
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76 if (other != null){
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77 MethodInfo mi = insn.getMethodInfo();
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78 MethodInfo miOther = other.insn.getMethodInfo();
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79 if (mi == miOther){
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80 return (mi.getLineNumber(insn) == miOther.getLineNumber(other.insn));
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81 }
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82 }
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83
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84 return false;
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85 }
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86
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87 public String getLocationString() {
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88 MethodInfo mi = insn.getMethodInfo();
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89 if (mi != null) {
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90 return mi.getSourceFileName() + ':' + mi.getLineNumber(insn);
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91 }
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92
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93 return "?:?";
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94 }
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95
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96 @Override
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97 public String toString() {
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98 return getLocationString();
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99 }
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100 }