Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/ThresholdFieldLockInfo.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.JPFException;
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21
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22 /**
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23 * a FieldLockInfo that assumes lock protection after n accesses with
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24 * non-empty lock sets
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25 */
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26 public abstract class ThresholdFieldLockInfo extends FieldLockInfo implements Cloneable {
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27 protected int remainingChecks;
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28
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29 protected ThresholdFieldLockInfo(int remainingChecks) {
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30 this.remainingChecks = remainingChecks;
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31 }
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32
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33 @Override
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34 public boolean isProtected() {
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35 // otherwise this would have turned into a EmptyFieldLockInfo
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36 return (remainingChecks == 0);
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37 }
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38
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39 protected void checkFailedLockAssumption(ThreadInfo ti, ElementInfo ei, FieldInfo fi) {
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40 if (remainingChecks == 0) {
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41 // with no locks remaining this would have been demoted to an
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42 // EmptyFieldLockInfo by now
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43 lockAssumptionFailed(ti, ei, fi);
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44 }
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45 }
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46
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47 /**
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48 * this implements a path-local FieldLockInfo that are never mutated
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49 * this has to be overridden for search global FieldLockInfos
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50 */
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51 protected FieldLockInfo getInstance (int nRemaining){
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52 try {
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53 ThresholdFieldLockInfo fli = (ThresholdFieldLockInfo)clone();
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54 fli.remainingChecks = nRemaining;
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55 return fli;
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56
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57 } catch (CloneNotSupportedException cnsx){
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58 throw new JPFException("clone of ThresholdFieldLockInfo failed: " + this);
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59 }
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60 }
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61 }