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annotate src/peers/gov/nasa/jpf/vm/JPF_gov_nasa_jpf_FinalizerThread.java @ 0:61d41facf527

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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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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 import gov.nasa.jpf.annotation.MJI;
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22 import gov.nasa.jpf.util.Predicate;
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23
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24 /**
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25 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
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26 *
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27 * A native peer for FinalizerThread. This is also an interface between the FinalizerThread
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28 * object at the SUT level and it corresponding FinalizerThreadInfo object at the JPF
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29 * level.
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30 */
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31 public class JPF_gov_nasa_jpf_FinalizerThread extends NativePeer {
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32
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33 @MJI
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34 public void runFinalizer__Ljava_lang_Object_2__V (MJIEnv env, int tiRef, int objRef) {
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35 int queueRef = env.getReferenceField(tiRef, "finalizeQueue");
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36 int[] elements = env.getReferenceArrayObject(queueRef);
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37
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38 if(elements.length>0 && elements[0]==objRef) {
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39 ThreadInfo finalizerTi = env.getThreadInfo();
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40 ClassInfo objCi = env.getElementInfo(objRef).getClassInfo();
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41 MethodInfo mi = objCi.getMethod("finalize()V", false);
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42
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43 // create and push a stack frame for finalize()V
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44 DirectCallStackFrame frame = mi.createDirectCallStackFrame(finalizerTi, 0);
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45 frame.setReferenceArgument(0, objRef, frame);
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46 finalizerTi.pushFrame(frame);
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47
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48 removeElement(env, tiRef, objRef);
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49 }
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50 }
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51
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52 // removes the very first element in the list, which is the last finalizable objects processed
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53 void removeElement(MJIEnv env, int tiRef, int objRef) {
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54 int queueRef = env.getReferenceField(tiRef, "finalizeQueue");
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55 ThreadInfo ti = env.getThreadInfo();
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56 int[] oldValues = env.getReferenceArrayObject(queueRef);
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57
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58 assert (objRef == oldValues[0]);
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59
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60 assert (oldValues.length>0);
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61
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62 int len = oldValues.length - 1;
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63 ElementInfo newQueue = env.getHeap().newArray("Ljava/lang/Object;", len, ti);
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64 int[] newValues = newQueue.asReferenceArray();
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65
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66 System.arraycopy(oldValues, 1, newValues, 0, len);
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67 env.getModifiableElementInfo(tiRef).setReferenceField("finalizeQueue", newQueue.getObjectRef());
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68 }
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69
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70 // a predicate to obtain all alive, non-finalizer threads within the ti process
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71 Predicate<ThreadInfo> getAppAliveUserPredicate (final ThreadInfo ti){
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72 return new Predicate<ThreadInfo>(){
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73 @Override
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74 public boolean isTrue (ThreadInfo t){
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75 return (t.isAlive() && !t.isSystemThread() && t.appCtx == ti.appCtx);
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76 }
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77 };
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78 }
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79
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80 @MJI
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81 public void manageState____V (MJIEnv env, int objref){
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82 ApplicationContext appCtx = env.getVM().getApplicationContext(objref);
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83 FinalizerThreadInfo tiFinalizer = appCtx.getFinalizerThread();
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84 VM vm = env.getVM();
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85
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86 // check for termination - Note that the finalizer thread has to be the last alive thread
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87 // of the process
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88 if(!vm.getThreadList().hasAnyMatching(getAppAliveUserPredicate(tiFinalizer))) {
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89 shutdown(env, objref);
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90 }
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91 // make the thread wait until more objects are added to finalizerQueue
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92 else {
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93 tiFinalizer.waitOnSemaphore();
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94
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95 assert tiFinalizer.isWaiting();
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96
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97 // this one has to consult the syncPolicy since there might be scheduling choices
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98 if (!tiFinalizer.getScheduler().setsPostFinalizeCG(tiFinalizer)){
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99 throw new JPFException("no transition break after finalization");
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100 }
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101 }
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102 }
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103
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104 protected void shutdown(MJIEnv env, int objRef) {
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105 env.getModifiableElementInfo(objRef).setBooleanField("done", true);
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106 }
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107 }