Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/RestorableVMState.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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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
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21 /**
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22 * NOTE - making VMStates fully restorable is currently very
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23 * expensive and should only be done on a selective basis
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24 */
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25 public class RestorableVMState {
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26
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27 /** the set of last executed insns */
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28 Transition lastTransition;
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29
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30 /* these are the icky parts - the history is kept as stacks inside the
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31 * VM (for restoration reasons), hence we have to copy it if we want
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32 * to restore a state. Since this is really expensive, it has to be done
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33 * on demand, with varying degrees of information
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34 */
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35 Path path;
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36
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37 Backtracker.RestorableState bkstate;
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38
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39 VM vm;
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40
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41 RestorableVMState (VM vm) {
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42 this.vm = vm;
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43
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44 path = vm.getClonedPath();
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45 bkstate = vm.getBacktracker().getRestorableState();
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46 lastTransition = vm.lastTrailInfo;
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47 }
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48
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49 public Backtracker.RestorableState getBkState() {
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50 return bkstate;
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51 }
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52
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53 public Transition getLastTransition () {
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54 return lastTransition;
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55 }
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56
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57 public Path getPath () {
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58 return path;
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59 }
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60
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61 public int getThread () {
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62 return lastTransition.getThreadIndex();
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63 }
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64
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65 }