Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/vm/choice/BreakGenerator.java @ 0:61d41facf527
initial v8 import (history reset)
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Fri, 23 Jan 2015 10:14:01 -0800 |
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children | fdc263e5806b |
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/* * Copyright (C) 2014, United States Government, as represented by the * Administrator of the National Aeronautics and Space Administration. * All rights reserved. * * The Java Pathfinder core (jpf-core) platform is licensed under the * Apache License, Version 2.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0. * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package gov.nasa.jpf.vm.choice; import gov.nasa.jpf.vm.ChoiceGenerator; import gov.nasa.jpf.vm.ChoiceGeneratorBase; import gov.nasa.jpf.vm.ThreadChoiceGenerator; import gov.nasa.jpf.vm.ThreadInfo; import java.io.PrintWriter; /** * a pseudo CG that is used to break transitions. It can be used to break and * just reschedule the current thread, or to indicate an end state * (e.g. for System.exit()) */ public class BreakGenerator extends ChoiceGeneratorBase<ThreadInfo> implements ThreadChoiceGenerator { protected ThreadInfo ti; protected int state = -1; protected boolean isTerminator; public BreakGenerator (String id, ThreadInfo ti, boolean isTerminator) { super(id); this.ti = ti; this.isTerminator = isTerminator; } @Override public ThreadInfo getNextChoice () { assert !isTerminator : "illegal operation on terminal BreakGenerator"; return (state == 0) ? ti : null; } @Override public void printOn (PrintWriter pw) { pw.println("BreakGenerator {" + ti.getName() + "}"); } @Override public void advance () { assert !isTerminator : "illegal operation on terminal BreakGenerator"; state++; } @Override public int getProcessedNumberOfChoices () { return (state >= 0) ? 1 : 0; } @Override public int getTotalNumberOfChoices () { return 1; } @Override public boolean hasMoreChoices () { if (isTerminator){ return false; } return (state < 0); } @Override public void reset () { state = -1; isDone = false; } @Override public boolean contains (ThreadInfo ti){ return this.ti == ti; } @Override public Class<ThreadInfo> getChoiceType() { return ThreadInfo.class; } @Override public ChoiceGenerator<ThreadInfo> randomize() { return this; } @Override public boolean isSchedulingPoint(){ return true; // that's the whole point of having a BreakGenerator } }