Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/search/heuristic/UserHeuristic.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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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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.search.heuristic;
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19
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20 import gov.nasa.jpf.Config;
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21 import gov.nasa.jpf.vm.ClassLoaderInfo;
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22 import gov.nasa.jpf.vm.ElementInfo;
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23 import gov.nasa.jpf.vm.VM;
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24
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25
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26 /**
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27 * heuristic state prioritizer that uses fields of the Main class under test
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28 * to determine priorities (i.e. priorities can be set by the program under test)
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29 *
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30 * <2do> pcm - does this still make sense in light of MJI ? If we keep it, this
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31 * has to be moved to the Verify interface!
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32 */
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33 public class UserHeuristic extends SimplePriorityHeuristic {
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34 static final int defaultValue = 1000;
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35
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36 public UserHeuristic (Config config, VM vm) {
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37 super(config, vm);
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38 }
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39
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40 @Override
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41 protected int computeHeuristicValue () {
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42
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43 // <2do> pcm - BAD, this is WAY too hardwired
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44 ClassLoaderInfo systemLoader = ClassLoaderInfo.getCurrentSystemClassLoader();
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45 ElementInfo ei = systemLoader.getElementInfo("Main");
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46 if (ei != null) {
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47 // this code is ugly because of the Reference interface
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48 ElementInfo b = ei.getObjectField("buffer");
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49
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50 if (b != null) {
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51 int current = b.getIntField("current");
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52 int capacity = b.getIntField("capacity");
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53
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54 return (capacity - current);
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55 }
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56 }
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57
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58 return defaultValue;
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59 }
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60 }