Example #1
0
        private MDP BuildMDP()
        {
            Stack <KeyValuePair <MDPConfiguration, MDPState> > working = new Stack <KeyValuePair <MDPConfiguration, MDPState> >(1024);

            string   initID = InitialStep.GetID();
            MDPState init   = new MDPState(initID);

            working.Push(new KeyValuePair <MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return(mdp);
                }

                KeyValuePair <MDPConfiguration, MDPState> current = working.Pop();
                IEnumerable <MDPConfiguration>            list    = current.Key.MakeOneMoveLocal();
                VerificationOutput.Transitions += list.Count();

                //check if it is one of the target state
                //if (list.Length == 0)
                if (current.Key.IsDeadLock)
                {
                    if (isNotTerminationTesting || current.Key.Event != Constants.TERMINATION)
                    {
                        mdp.AddTargetStates(current.Value);
                    }
                }
                else
                {
                    int          currentDistriIndex = -1;
                    Distribution newDis             = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Length; i++)
                    foreach (var step in list)
                    {
                        //MDPConfiguration step = list[i];
                        string   stepID = step.GetID();
                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            mdp.AddState(nextState);
                            working.Push(new KeyValuePair <MDPConfiguration, MDPState>(step, nextState));
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.Value.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event);
                            newTrivialDis.AddProbStatePair(1, nextState);
                            current.Value.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.Value.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return(mdp);
        }
Example #2
0
        //protected QueryConstraintType ConstraintType;
        //protected DRA DRA;
        //public DRA PositiveDRA;
        //public DRA NegativeDRA;
        //public BuchiAutomata PositiveBA;
        //protected double Min = -1;
        //protected double Max = -1;
        //protected MDP mdp;
        //protected Dictionary<string, int> MDPState2DRAStateMapping;
        //private bool HasDeadLock;
        ////private DefinitionRef Process;
        //public const string DUMMY_INIT = "dummy";

        //private bool AlmostFair = false;



        protected void BuildMD_ImprovedTarjan()
        {
            //int counter = 0;
            MDPState dummyInit = new MDPState(DUMMY_INIT);

            mdp = new MDP(dummyInit, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);


            List <PCSPEventDRAPairMEC> initials = GetInitialPairsEMC(InitialStep as MDPConfiguration);
            Stack <KeyValuePair <PCSPEventDRAPairMEC, MDPState> > working = new Stack <KeyValuePair <PCSPEventDRAPairMEC, MDPState> >(1024);
            //Stack<PCSPEventDRAPairMEC> stepStack = new Stack<PCSPEventDRAPairMEC>(1024);
            List <PCSPEventDRAPairMEC> stepStack = new List <PCSPEventDRAPairMEC>(1024);

            MDPState2DRAStateMapping = new Dictionary <string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            //HashSet<string> MDPStateMapping = new HashSet<string>();
            //build the MDP while identifying the SCCs
            List <List <string> > SCCs = new List <List <string> >(64);

            for (int z = 1; z <= initials.Count; z++)
            {
                PCSPEventDRAPairMEC initState = initials[z - 1];
                string   stringID             = initState.ID;
                MDPState newinit = new MDPState(stringID);
                mdp.AddState(newinit);
                dummyInit.AddDistribution(new Distribution(stringID, newinit));
                stepStack.Add(initState);
                //newinit.AddDistribution(new Distribution(Constants.TAU, newinit));
                working.Push(new KeyValuePair <PCSPEventDRAPairMEC, MDPState>(initState, newinit));
            }

            Dictionary <string, int> preorder    = new Dictionary <string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            Dictionary <string, int> lowlink     = new Dictionary <string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            Dictionary <string, int> distrRecord = new Dictionary <string, int>();

            int preorderCounter = 0;
            Dictionary <string, List <PCSPEventDRAPairMEC> > ExpendedNode = new Dictionary <string, List <PCSPEventDRAPairMEC> >();

            do
            {
                if (CancelRequested)
                {
                    this.VerificationOutput.NoOfStates = this.VerificationOutput.NoOfStates + mdp.States.Count;
                    return;
                }

                KeyValuePair <PCSPEventDRAPairMEC, MDPState> pair = working.Peek();
                MDPConfiguration evt         = pair.Key.configuration;
                int    DRAState              = pair.Key.state;
                string currentID             = pair.Key.ID;
                List <Distribution> outgoing = pair.Value.Distributions;

                if (!preorder.ContainsKey(currentID))
                {
                    preorder.Add(currentID, preorderCounter);
                    distrRecord.Add(currentID, 0);
                    //stepStack.Add(new PCSPEventDRAPairMEC(currentID + "separate" + 0));
                    preorderCounter++;
                }

                bool done = true;

                if (ExpendedNode.ContainsKey(currentID))
                {
                    List <PCSPEventDRAPairMEC> list = ExpendedNode[currentID];
                    //int counter = 0;
                    if (list.Count > 0)
                    {
                        int k = list.Count - 1;
                        //for (int k = list.Count - 1; k >= 0; k--)

                        PCSPEventDRAPairMEC step = list[k];
                        if (step == null)
                        {
                            stepStack.Add(new PCSPEventDRAPairMEC(currentID + "separate" + (distrRecord[currentID]++)));
                            list.RemoveAt(k);
                            continue;
                        }
                        else
                        {
                            string stepID = step.ID;
                            if (!preorder.ContainsKey(stepID))
                            {
                                //if (done)
                                //{
                                working.Push(new KeyValuePair <PCSPEventDRAPairMEC, MDPState>(step, mdp.States[stepID]));
                                stepStack.Add(step);
                                done = false;
                                list.RemoveAt(k);
                                //}
                            }
                            else
                            {
                                //stepStack.Add(step.ID);
                                stepStack.Add(step);
                                list.RemoveAt(k);
                                done = false;
                            }
                        }
                    }
                    //else
                    //{
                    //    stepStack.Add(new PCSPEventDRAPairMEC(currentID + "end"));
                    //}
                }
                else
                {
                    int          currentDistriIndex = -1;
                    Distribution newDis             = new Distribution(Constants.TAU);

                    IEnumerable <MDPConfiguration> steps = evt.MakeOneMoveLocal();
                    //int counter = 0;
                    //NOTE: here we play a trick for deadlock case: if a deadlock exist in the MDP, we will make a
                    //self loop transition to remove the deadlock. Deadlock is meaningless in MDP.
                    if (evt.IsDeadLock)
                    {
                        List <MDPConfiguration> stepsList = new List <MDPConfiguration>(steps);

                        stepsList.Add(CreateSelfLoopStep(evt));
                        steps       = stepsList;
                        HasDeadLock = true;
                    }

                    List <PCSPEventDRAPairMEC> product = NextMEC(steps.ToArray(), DRAState);
                    this.VerificationOutput.Transitions += product.Count;

                    for (int k = product.Count - 1; k >= 0; k--)
                    {
                        PCSPEventDRAPairMEC step = product[k];
                        string tmp = step.ID;
                        //int nextIndex = VisitedWithID.Count;
                        MDPState nextState;

                        if (mdp.States.TryGetValue(tmp, out nextState))
                        {
                            if (!preorder.ContainsKey(tmp))
                            {
                                if (done)
                                {
                                    working.Push(new KeyValuePair <PCSPEventDRAPairMEC, MDPState>(step, nextState));
                                    //stepStack.Add(step.ID);
                                    stepStack.Add(step);
                                    product.RemoveAt(k);
                                    done = false;
                                }
                                else
                                {
                                    product[k] = step;
                                }
                            }
                            else
                            {
                                if (done)
                                {
                                    product.RemoveAt(k);
                                    done = false;
                                }
                            }
                        }
                        else
                        {
                            nextState = new MDPState(tmp);
                            mdp.States.Add(tmp, nextState);

                            if (done)
                            {
                                working.Push(new KeyValuePair <PCSPEventDRAPairMEC, MDPState>(step, nextState));
                                //stepStack.Add(step.ID);
                                stepStack.Add(step);
                                done = false;
                                product.RemoveAt(k);
                            }
                            else
                            {
                                product[k] = step;
                            }
                        }

                        MDPConfiguration pstep = step.configuration;

                        if (pstep.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                pair.Value.AddDistribution(newDis);
                                product.Insert(k + 1, null);//separator
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(pstep.Event, nextState);
                            pair.Value.AddDistribution(newTrivialDis);
                            if (k != 0)
                            {
                                product.Insert(k, null);//separator
                            }
                        }
                        else if (currentDistriIndex != -1 && pstep.DisIndex != currentDistriIndex)
                        {
                            pair.Value.AddDistribution(newDis);
                            product.Insert(k + 1, null);//separator
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }

                        currentDistriIndex = pstep.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        pair.Value.AddDistribution(newDis);
                    }

                    ExpendedNode.Add(currentID, product);
                }

                if (done)
                {
                    int lowlinkV  = preorder[currentID];
                    int preorderV = preorder[currentID];

                    bool selfLoop = false;

                    //List<bool> temp = new List<bool>(outgoing.Count);
                    int length = outgoing.Count;

                    for (int i = 0; i < length; i++)//Distribution list in outgoing)
                    {
                        //temp[i] = true;
                        Distribution list         = outgoing[i];//note the order of distribution is reversed
                        int          templowlinkV = int.MaxValue;
                        //bool tempUpdate = false;
                        foreach (KeyValuePair <double, MDPState> state in list.States)
                        {
                            string w = state.Value.ID;

                            if (w == currentID && list.States.Count == 1)
                            {
                                selfLoop = true;
                            }

                            if (!MDPState2DRAStateMapping.ContainsKey(w))
                            {
                                //tempUpdate = true;
                                if (preorder[w] > preorderV)
                                {
                                    templowlinkV = Math.Min(templowlinkV, lowlink[w]);
                                    //lowlinkV = Math.Min(lowlinkV, lowlink[w]);
                                }
                                else
                                {
                                    templowlinkV = Math.Min(templowlinkV, preorder[w]);
                                    //lowlinkV = Math.Min(lowlinkV, preorder[w]);
                                }
                            }
                            else
                            {
                                templowlinkV = int.MaxValue;
                                break;
                            }
                        }

                        //if (tempUpdate)
                        //{

                        //}

                        if (templowlinkV == int.MaxValue)
                        {
                            //int index = stepStack.IndexOf(currentID + "separate" + i);
                            //for (int index = stepStack.IndexOf(currentID + "separate" + (i)); index < stepStack.Count; )
                            //{
                            //    if (stepStack[index] != currentID + "separate" + (i+1).ToString() && stepStack[index] != currentID + "end")
                            //    {
                            //        stepStack.RemoveAt(index);
                            //    }
                            //    else
                            //    {
                            //        break;
                            //    }
                            //}
                            bool remove = false;

                            List <int> toRemove = new List <int>();

                            for (int index = stepStack.Count - 1; index >= 0; index--)
                            {
                                //counter++;
                                if (stepStack[index].ID == currentID + "separate" + i)
                                {
                                    remove = true;
                                }
                                if (remove)
                                {
                                    if (stepStack[index].ID != currentID + "separate" + (i - 1) && stepStack[index].ID != currentID)
                                    {
                                        stepStack.RemoveAt(index);
                                    }
                                    else
                                    {
                                        break;
                                    }
                                }
                                else
                                {
                                    if (stepStack[index].ID == currentID)
                                    {
                                        foreach (var ind in toRemove)
                                        {
                                            stepStack.RemoveAt(ind);
                                        }
                                        break;
                                    }
                                    toRemove.Add(index);
                                }
                            }
                        }
                        else
                        {
                            lowlinkV = Math.Min(templowlinkV, lowlinkV);
                        }
                    }

                    lowlink[currentID] = lowlinkV;
                    working.Pop();

                    if (lowlinkV == preorderV)
                    {
                        List <string> SCC = new List <string>(1024);
                        SCC.Add(currentID);
                        MDPState2DRAStateMapping.Add(currentID, DRAState);
                        //while (stepStack.Count > 0 && preorder[stepStack[stepStack.Count - 1]] > preorderV)
                        while (stepStack[stepStack.Count - 1].ID != currentID)
                        {
                            PCSPEventDRAPairMEC s = stepStack[stepStack.Count - 1];
                            string sID            = s.ID;
                            stepStack.RemoveAt(stepStack.Count - 1);
                            if (!sID.Contains("separate") && !SCC.Contains(sID))
                            {
                                SCC.Add(sID);
                                MDPState2DRAStateMapping.Add(sID, s.state);
                                //MDPState2DRAStateMapping.Add(sID, );
                            }
                        }

                        stepStack.RemoveAt(stepStack.Count - 1);

                        if (SCC.Count > 1 || selfLoop) //evt.IsDeadLock ||
                        {
                            SCCs.Add(SCC);
                        }
                    }
                    //else
                    //{
                    //    stepStack.Push(pair.Key);
                    //}
                }
            } while (working.Count > 0);


            Debug.WriteLine(mdp.States.Count);
            List <string> EndComponents = new List <string>(SCCs.Count);
            int           count         = DRA.acceptance().size();
            int           helper        = 0;

            foreach (List <string> scc in SCCs)
            {
                //for debug
                //List<MDPState> debug = new List<MDPState>();
                //List<int> drastates = new List<int>();
                //foreach(string state in scc)
                //{
                //    debug.Add(mdp.States[state]);
                //    drastates.Add(MDPState2DRAStateMapping[state]);
                //}
                //for debug
                //if(sentence.Count == 0)
                //{

                //}
                for (int index = 0; index < count; index++)
                {
                    List <string> newSCC  = new List <string>();
                    List <string> targets = new List <string>();

                    if (AlmostFair)
                    {
                        //bool bottom = true;
                        ////int SCCcount = scc.Count;
                        ////note that as long as one SCC(might not be a real MEC) has a U state, the whole SCC cannot be targets.
                        ////RemoveNonECStates(scc, targets);
                        //foreach (string i in scc)
                        //{
                        //    int draState = MDPState2DRAStateMapping[i];
                        //    if (bottom)
                        //    {
                        //        if (DRA.acceptance().isStateInAcceptance_U(index, draState))
                        //        {
                        //            bottom = false;
                        //        }
                        //    }

                        //    newSCC.Add(i);

                        //    if (DRA.acceptance().isStateInAcceptance_L(index, draState))
                        //    {
                        //        targets.Add(i);
                        //    }

                        //}
                        //if (bottom)
                        //{
                        //    if (!BottomECStates(newSCC, targets))
                        //    {
                        //        if (newSCC.Count > 0)
                        //        {
                        //            GroupMEC(newSCC);
                        //        }
                        //    }
                        //    else
                        //    {
                        //        Common.Classes.Ultility.Ultility.AddList(EndComponents, scc);
                        //    }
                        //}
                        //else
                        //{
                        //    RemoveNonECStates(newSCC);
                        //    if (newSCC.Count > 0)
                        //    {
                        //        GroupMEC(newSCC);
                        //    }
                        //}
                    }
                    else
                    {
                        foreach (string i in scc)
                        {
                            int draState = MDPState2DRAStateMapping[i];
                            if (!DRA.acceptance().isStateInAcceptance_U(index, draState))
                            {
                                newSCC.Add(i);
                                //note add by ssz
                                if (DRA.acceptance().isStateInAcceptance_L(index, draState))
                                {
                                    targets.Add(i);
                                }
                                //note add by ssz
                            }
                        }
                        if (targets.Count > 0)
                        {
                            RemoveNonECStates(newSCC, targets);
                        }
                        if (targets.Count > 0)
                        {
                            //List<string> endComponent = TarjanModelChecking(index, newSCC);
                            Debug.WriteLine(helper++);
                            //Common.Classes.Ultility.Ultility.AddList(EndComponents, endComponent);
                            Common.Classes.Ultility.Ultility.AddList(EndComponents, scc);//note here newSCC changed to scc
                        }
                        else
                        {
                            if (scc.Count > 1)
                            {
                                GroupMEC(scc);
                            }
                        }
                    }
                }
            }

            foreach (string s in EndComponents)
            {
                mdp.AddTargetStates(mdp.States[s]);
            }
            Debug.WriteLine(mdp.States.Count);
            VerificationOutput.NoOfStates = VerificationOutput.NoOfStates + mdp.States.Count;
        }
Example #3
0
        private void BuildMDPSafety()
        {
            Stack <KeyValuePair <EventBAPairSafetyPCSP, MDPState> > working = new Stack <KeyValuePair <EventBAPairSafetyPCSP, MDPState> >(1024);
            EventBAPairSafetyPCSP initialstep = EventBAPairSafetyPCSP.GetInitialPairs(BA, InitialStep as MDPConfiguration);
            string   initID = initialstep.GetID();
            MDPState init   = new MDPState(initID);

            working.Push(new KeyValuePair <EventBAPairSafetyPCSP, MDPState>(initialstep, init));
            mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                }

                KeyValuePair <EventBAPairSafetyPCSP, MDPState> current = working.Pop();
                if (current.Key.BAStates.Count == 0)
                {
                    mdp.AddTargetStates(current.Value);
                }
                else
                {
                    MDPConfiguration[] steps = current.Key.Config.MakeOneMoveLocal().ToArray();
                    this.VerificationOutput.Transitions += steps.Length;

                    List <EventBAPairSafetyPCSP> products = EventBAPairSafetyPCSP.Next(BA, steps, current.Key.BAStates);

                    int          currentDistriIndex = -1;
                    Distribution newDis             = new Distribution(Constants.TAU);

                    foreach (EventBAPairSafetyPCSP eventBaPairSafetyPcsp in products)
                    {
                        string   stepID = eventBaPairSafetyPcsp.GetID();
                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            mdp.AddState(nextState);
                            working.Push(new KeyValuePair <EventBAPairSafetyPCSP, MDPState>(eventBaPairSafetyPcsp, nextState));
                        }

                        if (eventBaPairSafetyPcsp.Config.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.Value.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(eventBaPairSafetyPcsp.Config.Event);
                            newTrivialDis.AddProbStatePair(1, nextState);
                            current.Value.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && eventBaPairSafetyPcsp.Config.DisIndex != currentDistriIndex)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(eventBaPairSafetyPcsp.Config.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(eventBaPairSafetyPcsp.Config.Probability, nextState);
                        }

                        currentDistriIndex = eventBaPairSafetyPcsp.Config.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.Value.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
        }
        private void BuildMDPSafety()
        {
            Stack<KeyValuePair<EventBAPairSafetyPCSP, MDPState>> working = new Stack<KeyValuePair<EventBAPairSafetyPCSP, MDPState>>(1024);
            EventBAPairSafetyPCSP initialstep = EventBAPairSafetyPCSP.GetInitialPairs(BA, InitialStep as MDPConfiguration);
            string initID = initialstep.GetID();
            MDPState init = new MDPState(initID);

            working.Push(new KeyValuePair<EventBAPairSafetyPCSP, MDPState>(initialstep, init));
            mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                }

                KeyValuePair<EventBAPairSafetyPCSP, MDPState> current = working.Pop();
                if (current.Key.BAStates.Count == 0)
                {
                    mdp.AddTargetStates(current.Value);
                }
                else
                {
                    MDPConfiguration[] steps = current.Key.Config.MakeOneMoveLocal().ToArray();
                    this.VerificationOutput.Transitions += steps.Length;

                    List<EventBAPairSafetyPCSP> products = EventBAPairSafetyPCSP.Next(BA, steps, current.Key.BAStates);

                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    foreach (EventBAPairSafetyPCSP eventBaPairSafetyPcsp in products)
                    {
                        string stepID = eventBaPairSafetyPcsp.GetID();
                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            mdp.AddState(nextState);
                            working.Push(new KeyValuePair<EventBAPairSafetyPCSP, MDPState>(eventBaPairSafetyPcsp, nextState));
                        }

                        if (eventBaPairSafetyPcsp.Config.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.Value.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(eventBaPairSafetyPcsp.Config.Event);
                            newTrivialDis.AddProbStatePair(1, nextState);
                            current.Value.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && eventBaPairSafetyPcsp.Config.DisIndex != currentDistriIndex)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(eventBaPairSafetyPcsp.Config.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(eventBaPairSafetyPcsp.Config.Probability, nextState);
                        }

                        currentDistriIndex = eventBaPairSafetyPcsp.Config.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.Value.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
        }
Example #5
0
        private MDP BuildMDPAntiChain_S()
        {
            DeterministicAutomata_Subset specAutomaton = BuildDeterministicAutomata_Subset(InitSpecStep);

            Stack <TupleSub> working = new Stack <TupleSub>(1024);

            DeterministicFAState_Subset InitialSpec = specAutomaton.InitialState;
            Dictionary <string, HashSet <DeterministicFAState_Subset> > antichain = new Dictionary <string, HashSet <DeterministicFAState_Subset> >();

            string   impID  = InitialStep.GetID();
            int      specID = InitialSpec.GetID();
            MDPState init   = new MDPState(impID + Constants.SEPARATOR + specID);

            working.Push(new TupleSub(InitialStep as MDPConfiguration, InitialSpec, init));


            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);
            HashSet <DeterministicFAState_Subset> Specs = new HashSet <DeterministicFAState_Subset>();

            Specs.Add(InitialSpec);
            antichain.Add(impID, Specs);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return(mdp);
                }

                TupleSub current = working.Pop();
                if (current.SpecState == null)
                {
                    mdp.AddTargetStates(current.MDPState);
                }
                else
                {
                    IEnumerable <MDPConfiguration> list = current.ImplState.MakeOneMoveLocal();
                    VerificationOutput.Transitions += list.Count();

                    int          currentDistriIndex = -1;
                    Distribution newDis             = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Count; i++)
                    foreach (MDPConfiguration step in list)
                    {
                        //MDPConfiguration step = list[i];
                        DeterministicFAState_Subset nextSpec = current.SpecState;

                        if (step.Event != Constants.TAU)
                        {
                            nextSpec = current.SpecState.Next(step.Event);
                        }

                        //System.Diagnostics.Debug.Assert(nextSpec != null, "NextSpec is null!!");

                        //string stepID = step.GetID() + Constants.SEPARATOR + nextSpec.GetID().ToString();
                        impID = step.GetID();

                        string stepID = impID + Constants.SEPARATOR + (nextSpec == null ? "" : nextSpec.GetID().ToString());

                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            //mdp.AddState(nextState);
                            //KeyValuePair<MDPConfiguration, DeterministicFAState_Subset> newPair =
                            //    new KeyValuePair<MDPConfiguration, DeterministicFAState_Subset>(step, nextSpec);

                            //working.Push(new TupleSub(step, nextSpec, nextState));
                            bool addstate = true;
                            if (nextSpec != null)
                            {
                                //specID = nextSpec.GetID();

                                //DeterministicFAState_Subset DFAstate = nextSpec;
                                HashSet <DeterministicFAState_Subset> specStates;
                                //Dictionary<int, MDPState> mapping = null;
                                if (antichain.TryGetValue(impID, out specStates))
                                {
                                    HashSet <DeterministicFAState_Subset> toRemove =
                                        new HashSet <DeterministicFAState_Subset>();
                                    //int Spec = nextSpec.GetID();
                                    bool chainIncrease = true;
                                    foreach (DeterministicFAState_Subset specState in specStates)
                                    {
                                        //DeterministicFAState_Subset specState = specStates[j];
                                        if (specState.Sub.Contains(nextSpec))
                                        {
                                            toRemove.Add(specState);
                                            nextSpec.Sub.Add(specState);
                                            chainIncrease = false;
                                        }
                                        if (nextSpec.Sub.Contains(specState))
                                        {
                                            nextSpec      = specState;
                                            addstate      = false;
                                            chainIncrease = false;
                                            break;
                                        }
                                    }
                                    if (toRemove.Count > 0)
                                    {
                                        foreach (var specState in toRemove)
                                        {
                                            specStates.Remove(specState);
                                        }
                                        specStates.Add(nextSpec); // toRemove;
                                    }
                                    else if (chainIncrease)
                                    {
                                        specStates.Add(nextSpec);
                                    }
                                }
                                else
                                {
                                    HashSet <DeterministicFAState_Subset> newSpecs = new HashSet <DeterministicFAState_Subset>();
                                    newSpecs.Add(nextSpec);
                                    antichain.Add(impID, newSpecs);
                                }
                            }
                            if (addstate)
                            {
                                mdp.AddState(nextState);
                                working.Push(new TupleSub(step, nextSpec, nextState));
                            }
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.MDPState.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event, nextState);
                            current.MDPState.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.MDPState.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }


                    if (currentDistriIndex >= 0)
                    {
                        current.MDPState.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return(mdp);
        }
Example #6
0
        protected MDP BuildMDP()
        {
            Stack<KeyValuePair<MDPConfiguration, MDPState>> working = new Stack<KeyValuePair<MDPConfiguration, MDPState>>(1024);

            string initID = InitialStep.GetID();
            MDPState init = new MDPState(initID);
            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            //if initial state is target
            ExpressionValue initV = EvaluatorDenotational.Evaluate(ReachableStateCondition, InitialStep.GlobalEnv);
            if ((initV as BoolConstant).Value)
            {
                mdp.AddTargetStates(init);
                VerificationOutput.NoOfStates = 1;
                return mdp;
            }
            //if initial state is target

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return mdp;
                }

                KeyValuePair<MDPConfiguration, MDPState> current = working.Pop();
                IEnumerable<MDPConfiguration> list = current.Key.MakeOneMoveLocal();
                VerificationOutput.Transitions += list.Count();

                int currentDistriIndex = -1;
                Distribution newDis = new Distribution(Constants.TAU);

                //for (int i = 0; i < list.Count; i++)
                foreach (var step in list)
                {
                    //MDPConfiguration step = list[i];
                    string stepID = step.GetID();
                    MDPState nextState;

                    if (!mdp.States.TryGetValue(stepID, out nextState))
                    {
                        nextState = new MDPState(stepID);
                        mdp.AddState(nextState);

                        ExpressionValue v = EvaluatorDenotational.Evaluate(ReachableStateCondition, step.GlobalEnv);

                        if ((v as BoolConstant).Value)
                        {
                            mdp.AddTargetStates(nextState);
                        }
                        else
                        {
                            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                        }
                    }

                    if (step.DisIndex == -1)
                    {
                        if (currentDistriIndex >= 0)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                        }

                        Distribution newTrivialDis = new Distribution(step.Event);
                        newTrivialDis.AddProbStatePair(1, nextState);
                        current.Value.AddDistribution(newTrivialDis);
                    }
                    else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                    {
                        current.Value.AddDistribution(newDis);
                        newDis = new Distribution(Constants.TAU);
                        newDis.AddProbStatePair(step.Probability, nextState);
                    }
                    else
                    {
                        newDis.AddProbStatePair(step.Probability, nextState);
                    }

                    currentDistriIndex = step.DisIndex;
                }

                if (currentDistriIndex >= 0)
                {
                    current.Value.AddDistribution(newDis);
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return mdp;
        }
Example #7
0
        private MDP BuildMDP()
        {
            DeterministicAutomata specAutomaton = BuildDeterministicAutomata(InitSpecStep);

            Stack <Tuple>        working     = new Stack <Tuple>(1024);
            DeterministicFAState currentSpec = specAutomaton.InitialState;

            MDPState init = new MDPState(InitialStep.GetID() + Constants.SEPARATOR + currentSpec.GetID());

            working.Push(new Tuple(InitialStep as MDPConfiguration, currentSpec, init));

            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return(mdp);
                }
                // KeyValuePair<KeyValuePair<MDPConfiguration, DeterministicFAState>, MDPState>
                Tuple current = working.Pop();
                if (current.SpecState == null)
                {
                    mdp.AddTargetStates(current.MDPState);
                }
                else
                {
                    IEnumerable <MDPConfiguration> list = current.ImplState.MakeOneMoveLocal();
                    VerificationOutput.Transitions += list.Count();

                    int          currentDistriIndex = -1;
                    Distribution newDis             = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Count; i++)
                    foreach (var step in list)
                    {
                        //MDPConfiguration step = list[i];
                        DeterministicFAState nextSpec = current.SpecState;

                        if (step.Event != Constants.TAU)
                        {
                            nextSpec = current.SpecState.Next(step.Event);
                        }

                        //System.Diagnostics.Debug.Assert(nextSpec != null, "NextSpec is null!!");

                        //string stepID = step.GetID() + Constants.SEPARATOR + nextSpec.GetID().ToString();
                        string stepID = step.GetID() + Constants.SEPARATOR + (nextSpec == null ? "" : nextSpec.GetID().ToString());

                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            mdp.AddState(nextState);

                            working.Push(new Tuple(step, nextSpec, nextState));
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.MDPState.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event, nextState);
                            current.MDPState.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.MDPState.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.MDPState.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return(mdp);
        }
Example #8
0
        private MDP BuildMDPSubset()
        {
            DeterministicAutomata_Subset specAutomaton = BuildDeterministicAutomata_Subset(InitSpecStep);

            Stack <TupleSub> working = new Stack <TupleSub>(1024);

            DeterministicFAState_Subset InitialSpec = specAutomaton.InitialState;


            Dictionary <string, Dictionary <int, MDPState> > visited = new Dictionary <string, Dictionary <int, MDPState> >();

            int    specID = InitialSpec.GetID();
            string impID  = InitialStep.GetID();

            MDPState init = new MDPState(impID + Constants.SEPARATOR + specID);

            working.Push(new TupleSub(InitialStep as MDPConfiguration, InitialSpec, init));

            Dictionary <int, MDPState> initialDic = new Dictionary <int, MDPState>();

            initialDic.Add(specID, init);
            visited.Add(impID, initialDic);

            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return(mdp);
                }

                TupleSub current = working.Pop();
                if (current.SpecState == null)
                {
                    mdp.AddTargetStates(current.MDPState);
                }
                else
                {
                    IEnumerable <MDPConfiguration> list = current.ImplState.MakeOneMoveLocal();
                    VerificationOutput.Transitions += list.Count();

                    int          currentDistriIndex = -1;
                    Distribution newDis             = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Count; i++)
                    foreach (var step in list)
                    {
                        //MDPConfiguration step = list[i];
                        DeterministicFAState_Subset nextSpec = current.SpecState;

                        if (step.Event != Constants.TAU)
                        {
                            nextSpec = current.SpecState.Next(step.Event);
                        }

                        //System.Diagnostics.Debug.Assert(nextSpec != null, "NextSpec is null!!");

                        //string stepID = step.GetID() + Constants.SEPARATOR + nextSpec.GetID().ToString();
                        impID = step.GetID();

                        string stepID = impID + Constants.SEPARATOR + (nextSpec == null ? "" : nextSpec.GetID().ToString());

                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            //mdp.AddState(nextState);
                            //KeyValuePair<MDPConfiguration, DeterministicFAState_Subset> newPair =
                            //    new KeyValuePair<MDPConfiguration, DeterministicFAState_Subset>(step, nextSpec);

                            working.Push(new TupleSub(step, nextSpec, nextState));

                            if (nextSpec != null)
                            {
                                specID = nextSpec.GetID();

                                //DeterministicFAState_Subset DFAstate = nextSpec;

                                Dictionary <int, MDPState> mapping = null;
                                if (visited.TryGetValue(impID, out mapping))
                                {
                                    //int Spec = nextSpec.GetID();
                                    mapping.Add(specID, nextState);

                                    foreach (int spec in mapping.Keys)
                                    {
                                        if (specAutomaton.States[spec].Sub.Contains(nextSpec))
                                        {
                                            mapping[spec].Sub.Add(nextState);
                                        }

                                        else if (nextSpec.Sub.Contains(specAutomaton.States[spec]))
                                        {
                                            nextState.Sub.Add(mapping[spec]);
                                        }
                                    }

                                    //foreach (var x in visited)
                                    //{

                                    //    if (x.Key.Key.GetID() == newPair.Key.GetID() &&
                                    //        x.SpecState.Sub.Contains(newPair.Value))
                                    //    {
                                    //        x.Value.Sub.Add(nextState);
                                    //    }
                                    //    else if (x.Key.Key.GetID() == newPair.Key.GetID() &&
                                    //             newPair.Value.Sub.Contains(x.SpecState))
                                    //    {
                                    //        nextState.Sub.Add(x.Value);
                                    //    }
                                    //}

                                    //visited.Add(newPair, nextState);
                                }
                                else
                                {
                                    Dictionary <int, MDPState> newDicDic = new Dictionary <int, MDPState>();
                                    newDicDic.Add(specID, nextState);
                                    visited.Add(impID, newDicDic);
                                }
                            }

                            mdp.AddState(nextState);
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.MDPState.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event, nextState);
                            current.MDPState.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.MDPState.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }


                    if (currentDistriIndex >= 0)
                    {
                        current.MDPState.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return(mdp);
        }
Example #9
0
        private MDP BuildMDPAntiChain_S()
        {
            DeterministicAutomata_Subset specAutomaton = BuildDeterministicAutomata_Subset(InitSpecStep);

            Stack<TupleSub> working = new Stack<TupleSub>(1024);

            DeterministicFAState_Subset InitialSpec = specAutomaton.InitialState;
            Dictionary<string, HashSet<DeterministicFAState_Subset>> antichain = new Dictionary<string, HashSet<DeterministicFAState_Subset>>();

            string impID = InitialStep.GetID();
            int specID = InitialSpec.GetID();
            MDPState init = new MDPState(impID + Constants.SEPARATOR + specID);

            working.Push(new TupleSub(InitialStep as MDPConfiguration, InitialSpec, init));

            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);
            HashSet<DeterministicFAState_Subset> Specs = new HashSet<DeterministicFAState_Subset>();
            Specs.Add(InitialSpec);
            antichain.Add(impID, Specs);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return mdp;
                }

                TupleSub current = working.Pop();
                if (current.SpecState == null)
                {
                    mdp.AddTargetStates(current.MDPState);
                }
                else
                {
                    IEnumerable<MDPConfiguration> list = current.ImplState.MakeOneMoveLocal();
                    VerificationOutput.Transitions += list.Count();

                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Count; i++)
                    foreach (MDPConfiguration step in list)
                    {
                        //MDPConfiguration step = list[i];
                        DeterministicFAState_Subset nextSpec = current.SpecState;

                        if (step.Event != Constants.TAU)
                        {
                            nextSpec = current.SpecState.Next(step.Event);
                        }

                        //System.Diagnostics.Debug.Assert(nextSpec != null, "NextSpec is null!!");

                        //string stepID = step.GetID() + Constants.SEPARATOR + nextSpec.GetID().ToString();
                        impID = step.GetID();

                        string stepID = impID + Constants.SEPARATOR + (nextSpec == null ? "" : nextSpec.GetID().ToString());

                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            //mdp.AddState(nextState);
                            //KeyValuePair<MDPConfiguration, DeterministicFAState_Subset> newPair =
                            //    new KeyValuePair<MDPConfiguration, DeterministicFAState_Subset>(step, nextSpec);

                            //working.Push(new TupleSub(step, nextSpec, nextState));
                            bool addstate = true;
                            if (nextSpec != null)
                            {
                                //specID = nextSpec.GetID();

                                //DeterministicFAState_Subset DFAstate = nextSpec;
                                HashSet<DeterministicFAState_Subset> specStates;
                                //Dictionary<int, MDPState> mapping = null;
                                if (antichain.TryGetValue(impID, out specStates))
                                {
                                    HashSet<DeterministicFAState_Subset> toRemove =
                                        new HashSet<DeterministicFAState_Subset>();
                                    //int Spec = nextSpec.GetID();
                                    bool chainIncrease = true;
                                    foreach (DeterministicFAState_Subset specState in specStates)
                                    {
                                        //DeterministicFAState_Subset specState = specStates[j];
                                        if (specState.Sub.Contains(nextSpec))
                                        {

                                            toRemove.Add(specState);
                                            nextSpec.Sub.Add(specState);
                                            chainIncrease = false;
                                        }
                                        if (nextSpec.Sub.Contains(specState))
                                        {
                                            nextSpec = specState;
                                            addstate = false;
                                            chainIncrease = false;
                                            break;
                                        }

                                    }
                                    if (toRemove.Count > 0)
                                    {
                                        foreach (var specState in toRemove)
                                        {
                                            specStates.Remove(specState);
                                        }
                                        specStates.Add(nextSpec); // toRemove;
                                    }
                                    else if (chainIncrease)
                                    {
                                        specStates.Add(nextSpec);
                                    }

                                }
                                else
                                {
                                    HashSet<DeterministicFAState_Subset> newSpecs = new HashSet<DeterministicFAState_Subset>();
                                    newSpecs.Add(nextSpec);
                                    antichain.Add(impID, newSpecs);
                                }
                            }
                            if (addstate)
                            {
                                mdp.AddState(nextState);
                                working.Push(new TupleSub(step, nextSpec, nextState));
                            }

                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.MDPState.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event, nextState);
                            current.MDPState.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.MDPState.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.MDPState.AddDistribution(newDis);
                    }

                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return mdp;
        }
Example #10
0
        private MDP BuildMDPSubset()
        {
            DeterministicAutomata_Subset specAutomaton = BuildDeterministicAutomata_Subset(InitSpecStep);

            Stack<TupleSub> working = new Stack<TupleSub>(1024);

            DeterministicFAState_Subset InitialSpec = specAutomaton.InitialState;

            Dictionary<string, Dictionary<int, MDPState>> visited = new Dictionary<string, Dictionary<int, MDPState>>();

            int specID = InitialSpec.GetID();
            string impID = InitialStep.GetID();

            MDPState init = new MDPState(impID + Constants.SEPARATOR + specID);

            working.Push(new TupleSub(InitialStep as MDPConfiguration, InitialSpec, init));

            Dictionary<int, MDPState> initialDic = new Dictionary<int, MDPState>();
            initialDic.Add(specID, init);
            visited.Add(impID, initialDic);

            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return mdp;
                }

                TupleSub current = working.Pop();
                if (current.SpecState == null)
                {
                    mdp.AddTargetStates(current.MDPState);
                }
                else
                {
                    IEnumerable<MDPConfiguration> list = current.ImplState.MakeOneMoveLocal();
                    VerificationOutput.Transitions += list.Count();

                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Count; i++)
                    foreach (var step in list)
                    {
                        //MDPConfiguration step = list[i];
                        DeterministicFAState_Subset nextSpec = current.SpecState;

                        if (step.Event != Constants.TAU)
                        {
                            nextSpec = current.SpecState.Next(step.Event);
                        }

                        //System.Diagnostics.Debug.Assert(nextSpec != null, "NextSpec is null!!");

                        //string stepID = step.GetID() + Constants.SEPARATOR + nextSpec.GetID().ToString();
                        impID = step.GetID();

                        string stepID = impID + Constants.SEPARATOR + (nextSpec == null ? "" : nextSpec.GetID().ToString());

                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            //mdp.AddState(nextState);
                            //KeyValuePair<MDPConfiguration, DeterministicFAState_Subset> newPair =
                            //    new KeyValuePair<MDPConfiguration, DeterministicFAState_Subset>(step, nextSpec);

                            working.Push(new TupleSub(step, nextSpec, nextState));

                            if (nextSpec != null)
                            {
                                specID = nextSpec.GetID();

                                //DeterministicFAState_Subset DFAstate = nextSpec;

                                Dictionary<int, MDPState> mapping = null;
                                if (visited.TryGetValue(impID, out mapping))
                                {
                                    //int Spec = nextSpec.GetID();
                                    mapping.Add(specID, nextState);

                                    foreach (int spec in mapping.Keys)
                                    {
                                        if (specAutomaton.States[spec].Sub.Contains(nextSpec))
                                        {
                                            mapping[spec].Sub.Add(nextState);
                                        }

                                        else if (nextSpec.Sub.Contains(specAutomaton.States[spec]))
                                        {
                                            nextState.Sub.Add(mapping[spec]);
                                        }
                                    }

                                    //foreach (var x in visited)
                                    //{

                                    //    if (x.Key.Key.GetID() == newPair.Key.GetID() &&
                                    //        x.SpecState.Sub.Contains(newPair.Value))
                                    //    {
                                    //        x.Value.Sub.Add(nextState);
                                    //    }
                                    //    else if (x.Key.Key.GetID() == newPair.Key.GetID() &&
                                    //             newPair.Value.Sub.Contains(x.SpecState))
                                    //    {
                                    //        nextState.Sub.Add(x.Value);
                                    //    }
                                    //}

                                    //visited.Add(newPair, nextState);
                                }
                                else
                                {
                                    Dictionary<int, MDPState> newDicDic = new Dictionary<int, MDPState>();
                                    newDicDic.Add(specID, nextState);
                                    visited.Add(impID, newDicDic);
                                }
                            }

                            mdp.AddState(nextState);
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.MDPState.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event, nextState);
                            current.MDPState.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.MDPState.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.MDPState.AddDistribution(newDis);
                    }

                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return mdp;
        }
Example #11
0
        private MDP BuildMDP()
        {
            DeterministicAutomata specAutomaton = BuildDeterministicAutomata(InitSpecStep);

            Stack<Tuple> working = new Stack<Tuple>(1024);
            DeterministicFAState currentSpec = specAutomaton.InitialState;

            MDPState init = new MDPState(InitialStep.GetID() + Constants.SEPARATOR + currentSpec.GetID());

            working.Push(new Tuple(InitialStep as MDPConfiguration, currentSpec, init));

            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return mdp;
                }
                // KeyValuePair<KeyValuePair<MDPConfiguration, DeterministicFAState>, MDPState>
               Tuple current = working.Pop();
                if (current.SpecState == null)
                {
                    mdp.AddTargetStates(current.MDPState);
                }
                else
                {
                    IEnumerable<MDPConfiguration> list = current.ImplState.MakeOneMoveLocal();
                    VerificationOutput.Transitions += list.Count();

                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Count; i++)
                    foreach (var step in list)
                    {
                        //MDPConfiguration step = list[i];
                        DeterministicFAState nextSpec = current.SpecState;

                        if (step.Event != Constants.TAU)
                        {
                            nextSpec = current.SpecState.Next(step.Event);
                        }

                        //System.Diagnostics.Debug.Assert(nextSpec != null, "NextSpec is null!!");

                        //string stepID = step.GetID() + Constants.SEPARATOR + nextSpec.GetID().ToString();
                        string stepID = step.GetID() + Constants.SEPARATOR + (nextSpec == null ? "" : nextSpec.GetID().ToString());

                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            mdp.AddState(nextState);

                            working.Push(new Tuple(step, nextSpec, nextState));
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.MDPState.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event, nextState);
                            current.MDPState.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.MDPState.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.MDPState.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return mdp;
        }
Example #12
0
        //protected QueryConstraintType ConstraintType;
        //protected DRA DRA;
        //public DRA PositiveDRA;
        //public DRA NegativeDRA;
        //public BuchiAutomata PositiveBA;
        //protected double Min = -1;
        //protected double Max = -1;
        //protected MDP mdp;
        //protected Dictionary<string, int> MDPState2DRAStateMapping;
        //private bool HasDeadLock;
        ////private DefinitionRef Process;
        //public const string DUMMY_INIT = "dummy";
        //private bool AlmostFair = false;
        protected void BuildMD_ImprovedTarjan()
        {
            //int counter = 0;
            MDPState dummyInit = new MDPState(DUMMY_INIT);
            mdp = new MDP(dummyInit, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            List<PCSPEventDRAPairMEC> initials = GetInitialPairsEMC(InitialStep as MDPConfiguration);
            Stack<KeyValuePair<PCSPEventDRAPairMEC, MDPState>> working = new Stack<KeyValuePair<PCSPEventDRAPairMEC, MDPState>>(1024);
            //Stack<PCSPEventDRAPairMEC> stepStack = new Stack<PCSPEventDRAPairMEC>(1024);
            List<PCSPEventDRAPairMEC> stepStack = new List<PCSPEventDRAPairMEC>(1024);

            MDPState2DRAStateMapping = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            //HashSet<string> MDPStateMapping = new HashSet<string>();
            //build the MDP while identifying the SCCs
            List<List<string>> SCCs = new List<List<string>>(64);

            for (int z = 1; z <= initials.Count; z++)
            {
                PCSPEventDRAPairMEC initState = initials[z - 1];
                string stringID = initState.ID;
                MDPState newinit = new MDPState(stringID);
                mdp.AddState(newinit);
                dummyInit.AddDistribution(new Distribution(stringID, newinit));
                stepStack.Add(initState);
                //newinit.AddDistribution(new Distribution(Constants.TAU, newinit));
                working.Push(new KeyValuePair<PCSPEventDRAPairMEC, MDPState>(initState, newinit));
            }

            Dictionary<string, int> preorder = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            Dictionary<string, int> lowlink = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            Dictionary<string, int> distrRecord = new Dictionary<string, int>();

            int preorderCounter = 0;
            Dictionary<string, List<PCSPEventDRAPairMEC>> ExpendedNode = new Dictionary<string, List<PCSPEventDRAPairMEC>>();

            do
            {
                if (CancelRequested)
                {
                    this.VerificationOutput.NoOfStates = this.VerificationOutput.NoOfStates + mdp.States.Count;
                    return;
                }

                KeyValuePair<PCSPEventDRAPairMEC, MDPState> pair = working.Peek();
                MDPConfiguration evt = pair.Key.configuration;
                int DRAState = pair.Key.state;
                string currentID = pair.Key.ID;
                List<Distribution> outgoing = pair.Value.Distributions;

                if (!preorder.ContainsKey(currentID))
                {
                    preorder.Add(currentID, preorderCounter);
                    distrRecord.Add(currentID, 0);
                    //stepStack.Add(new PCSPEventDRAPairMEC(currentID + "separate" + 0));
                    preorderCounter++;
                }

                bool done = true;

                if (ExpendedNode.ContainsKey(currentID))
                {
                    List<PCSPEventDRAPairMEC> list = ExpendedNode[currentID];
                    //int counter = 0;
                    if (list.Count > 0)
                    {
                        int k = list.Count - 1;
                        //for (int k = list.Count - 1; k >= 0; k--)

                        PCSPEventDRAPairMEC step = list[k];
                        if (step == null)
                        {
                            stepStack.Add(new PCSPEventDRAPairMEC(currentID + "separate" + (distrRecord[currentID]++)));
                            list.RemoveAt(k);
                            continue;
                        }
                        else
                        {
                            string stepID = step.ID;
                            if (!preorder.ContainsKey(stepID))
                            {
                                //if (done)
                                //{
                                    working.Push(new KeyValuePair<PCSPEventDRAPairMEC, MDPState>(step, mdp.States[stepID]));
                                    stepStack.Add(step);
                                    done = false;
                                    list.RemoveAt(k);
                                //}
                            }
                            else
                            {
                                //stepStack.Add(step.ID);
                                stepStack.Add(step);
                                list.RemoveAt(k);
                                done = false;
                            }
                        }

                    }
                    //else
                    //{
                    //    stepStack.Add(new PCSPEventDRAPairMEC(currentID + "end"));
                    //}
                }
                else
                {
                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    IEnumerable<MDPConfiguration> steps = evt.MakeOneMoveLocal();
                    //int counter = 0;
                    //NOTE: here we play a trick for deadlock case: if a deadlock exist in the MDP, we will make a
                    //self loop transition to remove the deadlock. Deadlock is meaningless in MDP.
                    if (evt.IsDeadLock)
                    {
                        List<MDPConfiguration> stepsList = new List<MDPConfiguration>(steps);

                        stepsList.Add(CreateSelfLoopStep(evt));
                        steps = stepsList;
                        HasDeadLock = true;
                    }

                    List<PCSPEventDRAPairMEC> product = NextMEC(steps.ToArray(), DRAState);
                    this.VerificationOutput.Transitions += product.Count;

                    for (int k = product.Count - 1; k >= 0; k--)
                    {
                        PCSPEventDRAPairMEC step = product[k];
                        string tmp = step.ID;
                        //int nextIndex = VisitedWithID.Count;
                        MDPState nextState;

                        if (mdp.States.TryGetValue(tmp, out nextState))
                        {

                            if (!preorder.ContainsKey(tmp))
                            {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<PCSPEventDRAPairMEC, MDPState>(step, nextState));
                                    //stepStack.Add(step.ID);
                                    stepStack.Add(step);
                                    product.RemoveAt(k);
                                    done = false;

                                }
                                else
                                {
                                    product[k] = step;
                                }
                            }
                            else
                            {
                                if (done)
                                {
                                    product.RemoveAt(k);
                                    done = false;
                                }
                            }
                        }
                        else
                        {
                            nextState = new MDPState(tmp);
                            mdp.States.Add(tmp, nextState);

                            if (done)
                            {
                                working.Push(new KeyValuePair<PCSPEventDRAPairMEC, MDPState>(step, nextState));
                                //stepStack.Add(step.ID);
                                stepStack.Add(step);
                                done = false;
                                product.RemoveAt(k);
                            }
                            else
                            {
                                product[k] = step;
                            }
                        }

                        MDPConfiguration pstep = step.configuration;

                        if (pstep.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                pair.Value.AddDistribution(newDis);
                                product.Insert(k+1, null);//separator
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(pstep.Event, nextState);
                            pair.Value.AddDistribution(newTrivialDis);
                            if (k != 0)
                            {
                                product.Insert(k, null);//separator
                            }

                        }
                        else if (currentDistriIndex != -1 && pstep.DisIndex != currentDistriIndex)
                        {
                            pair.Value.AddDistribution(newDis);
                            product.Insert(k+1, null);//separator
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }

                        currentDistriIndex = pstep.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        pair.Value.AddDistribution(newDis);
                    }

                    ExpendedNode.Add(currentID, product);
                }

                if (done)
                {
                    int lowlinkV = preorder[currentID];
                    int preorderV = preorder[currentID];

                    bool selfLoop = false;

                    //List<bool> temp = new List<bool>(outgoing.Count);
                    int length = outgoing.Count;

                    for (int i = 0; i < length; i++)//Distribution list in outgoing)
                    {
                        //temp[i] = true;
                        Distribution list = outgoing[i];//note the order of distribution is reversed
                        int templowlinkV = int.MaxValue;
                        //bool tempUpdate = false;
                        foreach (KeyValuePair<double, MDPState> state in list.States)
                        {
                            string w = state.Value.ID;

                            if (w == currentID && list.States.Count == 1)
                            {
                                selfLoop = true;
                            }

                            if (!MDPState2DRAStateMapping.ContainsKey(w))
                            {
                                //tempUpdate = true;
                                if (preorder[w] > preorderV)
                                {
                                    templowlinkV = Math.Min(templowlinkV, lowlink[w]);
                                    //lowlinkV = Math.Min(lowlinkV, lowlink[w]);
                                }
                                else
                                {
                                    templowlinkV = Math.Min(templowlinkV, preorder[w]);
                                    //lowlinkV = Math.Min(lowlinkV, preorder[w]);
                                }
                            }
                            else
                            {
                                templowlinkV = int.MaxValue;
                                break;
                            }
                        }

                        //if (tempUpdate)
                        //{

                        //}

                        if (templowlinkV == int.MaxValue)
                        {
                            //int index = stepStack.IndexOf(currentID + "separate" + i);
                            //for (int index = stepStack.IndexOf(currentID + "separate" + (i)); index < stepStack.Count; )
                            //{
                            //    if (stepStack[index] != currentID + "separate" + (i+1).ToString() && stepStack[index] != currentID + "end")
                            //    {
                            //        stepStack.RemoveAt(index);
                            //    }
                            //    else
                            //    {
                            //        break;
                            //    }
                            //}
                            bool remove = false;

                            List<int> toRemove = new List<int>();

                            for (int index = stepStack.Count - 1; index >= 0; index--)
                            {
                                //counter++;
                                if (stepStack[index].ID == currentID + "separate" + i)
                                {
                                    remove = true;
                                }
                                if (remove)
                                {
                                    if (stepStack[index].ID != currentID + "separate" + (i - 1) && stepStack[index].ID != currentID)
                                    {
                                        stepStack.RemoveAt(index);
                                    }
                                    else
                                    {
                                        break;
                                    }
                                }
                                else
                                {
                                    if (stepStack[index].ID == currentID)
                                    {
                                        foreach(var ind in toRemove)
                                        {
                                            stepStack.RemoveAt(ind);
                                        }
                                        break;
                                    }
                                    toRemove.Add(index);
                                }
                            }
                        }
                        else
                        {
                            lowlinkV = Math.Min(templowlinkV, lowlinkV);
                        }

                    }

                    lowlink[currentID] = lowlinkV;
                    working.Pop();

                    if (lowlinkV == preorderV)
                    {
                        List<string> SCC = new List<string>(1024);
                        SCC.Add(currentID);
                        MDPState2DRAStateMapping.Add(currentID, DRAState);
                        //while (stepStack.Count > 0 && preorder[stepStack[stepStack.Count - 1]] > preorderV)
                        while(stepStack[stepStack.Count - 1].ID != currentID)
                        {
                            PCSPEventDRAPairMEC s = stepStack[stepStack.Count - 1];
                            string sID = s.ID;
                            stepStack.RemoveAt(stepStack.Count - 1);
                            if (!sID.Contains("separate") && !SCC.Contains(sID))
                            {
                                SCC.Add(sID);
                                MDPState2DRAStateMapping.Add(sID, s.state);
                                //MDPState2DRAStateMapping.Add(sID, );
                            }

                        }

                        stepStack.RemoveAt(stepStack.Count - 1);

                        if (SCC.Count > 1 || selfLoop) //evt.IsDeadLock ||
                        {
                            SCCs.Add(SCC);
                        }
                    }
                    //else
                    //{
                    //    stepStack.Push(pair.Key);
                    //}
                }
            } while (working.Count > 0);

            Debug.WriteLine(mdp.States.Count);
            List<string> EndComponents = new List<string>(SCCs.Count);
            int count = DRA.acceptance().size();
            int helper = 0;

            foreach (List<string> scc in SCCs)
            {
                //for debug
                //List<MDPState> debug = new List<MDPState>();
                //List<int> drastates = new List<int>();
                //foreach(string state in scc)
                //{
                //    debug.Add(mdp.States[state]);
                //    drastates.Add(MDPState2DRAStateMapping[state]);
                //}
                //for debug
                //if(sentence.Count == 0)
                //{

                //}
                for (int index = 0; index < count; index++)
                {
                    List<string> newSCC = new List<string>();
                    List<string> targets = new List<string>();

                    if (AlmostFair)
                    {
                        //bool bottom = true;
                        ////int SCCcount = scc.Count;
                        ////note that as long as one SCC(might not be a real MEC) has a U state, the whole SCC cannot be targets.
                        ////RemoveNonECStates(scc, targets);
                        //foreach (string i in scc)
                        //{
                        //    int draState = MDPState2DRAStateMapping[i];
                        //    if (bottom)
                        //    {
                        //        if (DRA.acceptance().isStateInAcceptance_U(index, draState))
                        //        {
                        //            bottom = false;
                        //        }
                        //    }

                        //    newSCC.Add(i);

                        //    if (DRA.acceptance().isStateInAcceptance_L(index, draState))
                        //    {
                        //        targets.Add(i);
                        //    }

                        //}
                        //if (bottom)
                        //{
                        //    if (!BottomECStates(newSCC, targets))
                        //    {
                        //        if (newSCC.Count > 0)
                        //        {
                        //            GroupMEC(newSCC);
                        //        }
                        //    }
                        //    else
                        //    {
                        //        Common.Classes.Ultility.Ultility.AddList(EndComponents, scc);
                        //    }
                        //}
                        //else
                        //{
                        //    RemoveNonECStates(newSCC);
                        //    if (newSCC.Count > 0)
                        //    {
                        //        GroupMEC(newSCC);
                        //    }
                        //}
                    }
                    else
                    {
                        foreach (string i in scc)
                        {
                            int draState = MDPState2DRAStateMapping[i];
                            if (!DRA.acceptance().isStateInAcceptance_U(index, draState))
                            {
                                newSCC.Add(i);
                                //note add by ssz
                                if (DRA.acceptance().isStateInAcceptance_L(index, draState))
                                {
                                    targets.Add(i);
                                }
                                //note add by ssz
                            }

                        }
                        if (targets.Count > 0)
                        {
                            RemoveNonECStates(newSCC, targets);
                        }
                        if (targets.Count > 0)
                        {
                            //List<string> endComponent = TarjanModelChecking(index, newSCC);
                            Debug.WriteLine(helper++);
                            //Common.Classes.Ultility.Ultility.AddList(EndComponents, endComponent);
                            Common.Classes.Ultility.Ultility.AddList(EndComponents, scc);//note here newSCC changed to scc
                        }
                        else
                        {
                            if (scc.Count > 1)
                            {
                                GroupMEC(scc);
                            }
                        }

                    }

                }
            }

            foreach (string s in EndComponents)
            {
                mdp.AddTargetStates(mdp.States[s]);
            }
            Debug.WriteLine(mdp.States.Count);
            VerificationOutput.NoOfStates = VerificationOutput.NoOfStates + mdp.States.Count;
        }
Example #13
0
        /// <summary>
        /// This method builds a MDP, while identifying SCCs.
        /// </summary>
        protected void BuildMDP_OldTarjan()
        {
            MDPState dummyInit = new MDPState(DUMMY_INIT);
            mdp = new MDP(dummyInit, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            List<PCSPEventDRAPair> initials = GetInitialPairs(InitialStep as MDPConfiguration);
            Stack<KeyValuePair<PCSPEventDRAPair, MDPState>> working = new Stack<KeyValuePair<PCSPEventDRAPair, MDPState>>(1024);
            Stack<PCSPEventDRAPair> stepStack = new Stack<PCSPEventDRAPair>(1024);
            MDPState2DRAStateMapping = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);

            //build the MDP while identifying the SCCs
            List<List<string>> SCCs = new List<List<string>>(64);

            for (int z = 1; z <= initials.Count; z++)
            {
                PCSPEventDRAPair initState = initials[z - 1];
                string stringID = initState.GetCompressedState();
                MDPState newinit = new MDPState(stringID);
                mdp.AddState(newinit);
                dummyInit.AddDistribution(new Distribution(stringID, newinit));

                //newinit.AddDistribution(new Distribution(Constants.TAU, newinit));
                working.Push(new KeyValuePair<PCSPEventDRAPair, MDPState>(initState, newinit));
            }

            Dictionary<string, int> preorder = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            Dictionary<string, int> lowlink = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);

            int preorderCounter = 0;
            Dictionary<string, List<PCSPEventDRAPair>> ExpendedNode = new Dictionary<string, List<PCSPEventDRAPair>>();

            do
            {
                if (CancelRequested)
                {
                    this.VerificationOutput.NoOfStates = this.VerificationOutput.NoOfStates + mdp.States.Count;
                    return;
                }

                KeyValuePair<PCSPEventDRAPair, MDPState> pair = working.Peek();
                MDPConfiguration evt = pair.Key.configuration;
                int DRAState = pair.Key.state;
                string currentID = pair.Key.GetCompressedState();

                List<Distribution> outgoing = pair.Value.Distributions;

                if (!preorder.ContainsKey(currentID))
                {
                    preorder.Add(currentID, preorderCounter);
                    preorderCounter++;
                }

                bool done = true;

                if (ExpendedNode.ContainsKey(currentID))
                {
                    List<PCSPEventDRAPair> list = ExpendedNode[currentID];
                    if (list.Count > 0)
                    {
                        for (int k = list.Count - 1; k >= 0; k--)
                        {
                            PCSPEventDRAPair step = list[k];

                            string stepID = step.GetCompressedState();
                            if (!preorder.ContainsKey(stepID))
                            {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<PCSPEventDRAPair, MDPState>(step, mdp.States[stepID]));
                                    done = false;
                                    list.RemoveAt(k);
                                }
                            }
                            else
                            {
                                list.RemoveAt(k);
                            }
                        }
                    }
                }
                else
                {
                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    MDPConfiguration[] steps = evt.MakeOneMoveLocal().ToArray();

                    //NOTE: here we play a trick for deadlock case: if a deadlock exist in the MDP, we will make a
                    //self loop transition to remove the deadlock. Deadlock is meaningless in MDP.
                    if(evt.IsDeadLock)
                    {
                        List<MDPConfiguration> stepsList = new List<MDPConfiguration>(steps);

                        stepsList.Add(CreateSelfLoopStep(evt));
                        steps = stepsList.ToArray();
                        HasDeadLock = true;
                    }

                    List<PCSPEventDRAPair> product = Next(steps, DRAState);
                    this.VerificationOutput.Transitions += product.Count;

                    for (int k = product.Count - 1; k >= 0; k--)
                    {
                        PCSPEventDRAPair step = product[k];
                        string tmp = step.GetCompressedState();
                        //int nextIndex = VisitedWithID.Count;
                        MDPState nextState;

                        if (mdp.States.TryGetValue(tmp, out nextState))
                        {

                            if (!preorder.ContainsKey(tmp))
                            {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<PCSPEventDRAPair, MDPState>(step, nextState));
                                    done = false;
                                    product.RemoveAt(k);
                                }
                                else
                                {
                                    product[k] = step;
                                }
                            }
                            else
                            {
                                product.RemoveAt(k);
                            }
                        }
                        else
                        {
                            nextState = new MDPState(tmp);
                            mdp.States.Add(tmp, nextState);

                            if (done)
                            {
                                working.Push(new KeyValuePair<PCSPEventDRAPair, MDPState>(step, nextState));
                                done = false;
                                product.RemoveAt(k);
                            }
                            else
                            {
                                product[k] = step;
                            }
                        }

                        MDPConfiguration pstep = step.configuration;

                        if (pstep.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                pair.Value.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            //note here changed by ssz
                            //int draState = MDPState2DRAStateMapping[pair.Value.ID];
                            if(nextState == pair.Value)
                            {
                                for (int index = 0; index < DRA.acceptance().size(); index++)
                                {
                                    if (DRA.acceptance().isStateInAcceptance_L(index, DRAState))
                                    {
                                        mdp.AddTargetStates(pair.Value);
                                    }
                                }
                            }
                            else
                            {
                                Distribution newTrivialDis = new Distribution(pstep.Event, nextState);
                                pair.Value.AddDistribution(newTrivialDis);
                            }

                            //note here changed by ssz
                        }
                        else if (currentDistriIndex != -1 && pstep.DisIndex != currentDistriIndex)
                        {
                            pair.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }

                        currentDistriIndex = pstep.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        pair.Value.AddDistribution(newDis);
                    }

                    ExpendedNode.Add(currentID, product);
                }

                if (done)
                {
                    int lowlinkV = preorder[currentID];
                    int preorderV = preorder[currentID];

                    bool selfLoop = false;
                    foreach (Distribution list in outgoing)
                    {
                        foreach (KeyValuePair<double, MDPState> state in list.States)
                        {
                            string w = state.Value.ID;

                            if (w == currentID)
                            {
                                selfLoop = true;
                            }

                            if (!MDPState2DRAStateMapping.ContainsKey(w))
                            {
                                if (preorder[w] > preorderV)
                                {
                                    lowlinkV = Math.Min(lowlinkV, lowlink[w]);
                                }
                                else
                                {
                                    lowlinkV = Math.Min(lowlinkV, preorder[w]);
                                }
                            }
                        }
                    }

                    lowlink[currentID] = lowlinkV;
                    working.Pop();

                    if (lowlinkV == preorderV)
                    {
                        List<string> SCC = new List<string>(1024);
                        SCC.Add(currentID);
                        MDPState2DRAStateMapping.Add(currentID, DRAState);
                        while (stepStack.Count > 0 && preorder[stepStack.Peek().GetCompressedState()] > preorderV)
                        {
                            PCSPEventDRAPair s = stepStack.Pop();
                            string sID = s.GetCompressedState();
                            SCC.Add(sID);
                            MDPState2DRAStateMapping.Add(sID, s.state);
                        }

                        if (SCC.Count > 1 || selfLoop) //evt.IsDeadLock ||
                        {
                            SCCs.Add(SCC);
                        }
                    }
                    else
                    {
                        stepStack.Push(pair.Key);
                    }
                }
            } while (working.Count > 0);

            List<string> EndComponents = new List<string>(SCCs.Count);
            int count = DRA.acceptance().size();
            int helper = 0;

            foreach (List<string> scc in SCCs)
            {
                //for debug
                //List<MDPState> debug = new List<MDPState>();
                //List<int> drastates = new List<int>();
                //foreach(string state in scc)
                //{
                //    debug.Add(mdp.States[state]);
                //    drastates.Add(MDPState2DRAStateMapping[state]);
                //}
                //for debug
                for (int index = 0; index < count; index++)
                {
                    List<string> newSCC = new List<string>();
                    List<string> targets = new List<string>();

                    if (AlmostFair)
                    {
                        bool bottom = true;
                        //int SCCcount = scc.Count;
                        //note that as long as one SCC(might not be a real MEC) has a U state, the whole SCC cannot be targets.
                        //RemoveNonECStates(scc, targets);
                        foreach (string i in scc)
                        {
                            int draState = MDPState2DRAStateMapping[i];
                            if (bottom)
                            {
                                if (DRA.acceptance().isStateInAcceptance_U(index, draState))
                                {
                                    bottom = false;
                                }
                            }

                            newSCC.Add(i);

                            if (DRA.acceptance().isStateInAcceptance_L(index, draState))
                            {
                                targets.Add(i);
                            }

                        }
                        if(bottom)
                        {
                            if (!BottomECStates(newSCC, targets))
                            {
                                if (newSCC.Count > 0)
                                {
                                    GroupMEC(newSCC);
                                }
                            }
                            else
                            {
                                Common.Classes.Ultility.Ultility.AddList(EndComponents, scc);
                            }
                        }
                        else
                        {
                            RemoveNonECStates(newSCC);
                            if(newSCC.Count>0)
                            {
                                GroupMEC(newSCC);
                            }
                        }
                    }
                    else
                    {
                        foreach (string i in scc)
                        {
                            int draState = MDPState2DRAStateMapping[i];
                            if (!DRA.acceptance().isStateInAcceptance_U(index, draState))
                            {
                                newSCC.Add(i);
                                //note add by ssz
                                if (DRA.acceptance().isStateInAcceptance_L(index, draState))
                                {
                                    targets.Add(i);
                                }
                                //note add by ssz
                            }

                        }
                        //if (AlmostFair)
                        //{
                        //    RemoveNonECStates(newSCC, targets);
                        //    if (newSCC.Count > 0)
                        //    {
                        //        GroupMEC(newSCC);
                        //    }
                        //    if (newSCC.Count > 0)
                        //    {

                        //    }
                        //}
                        //else
                        //{
                        if (targets.Count > 0)
                        {
                            RemoveNonECStates(newSCC, targets);
                        }
                        else
                        {
                            continue;
                        }

                        if (targets.Count > 0)
                        {
                            //List<string> endComponent = TarjanModelChecking(index, newSCC);
                            Debug.WriteLine(helper++);
                            //Common.Classes.Ultility.Ultility.AddList(EndComponents, endComponent);
                            Common.Classes.Ultility.Ultility.AddList(EndComponents, newSCC);
                        }
                        //}

                    }

                }
            }

            foreach (string s in EndComponents)
            {
                mdp.AddTargetStates(mdp.States[s]);
            }

            VerificationOutput.NoOfStates = VerificationOutput.NoOfStates + mdp.States.Count;
            //mdp.BackUpTargetStates();
        }
        protected MDP BuildMDP()
        {
            Stack <KeyValuePair <MDPConfiguration, MDPState> > working = new Stack <KeyValuePair <MDPConfiguration, MDPState> >(1024);

            string   initID = InitialStep.GetID();
            MDPState init   = new MDPState(initID);

            working.Push(new KeyValuePair <MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            //if initial state is target
            ExpressionValue initV = EvaluatorDenotational.Evaluate(ReachableStateCondition, InitialStep.GlobalEnv);

            if ((initV as BoolConstant).Value)
            {
                mdp.AddTargetStates(init);
                VerificationOutput.NoOfStates = 1;
                return(mdp);
            }
            //if initial state is target

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return(mdp);
                }

                KeyValuePair <MDPConfiguration, MDPState> current = working.Pop();
                IEnumerable <MDPConfiguration>            list    = current.Key.MakeOneMoveLocal();
                VerificationOutput.Transitions += list.Count();

                int          currentDistriIndex = -1;
                Distribution newDis             = new Distribution(Constants.TAU);

                //for (int i = 0; i < list.Count; i++)
                foreach (var step in list)
                {
                    //MDPConfiguration step = list[i];
                    string   stepID = step.GetID();
                    MDPState nextState;

                    if (!mdp.States.TryGetValue(stepID, out nextState))
                    {
                        nextState = new MDPState(stepID);
                        mdp.AddState(nextState);

                        ExpressionValue v = EvaluatorDenotational.Evaluate(ReachableStateCondition, step.GlobalEnv);

                        if ((v as BoolConstant).Value)
                        {
                            mdp.AddTargetStates(nextState);
                        }
                        else
                        {
                            working.Push(new KeyValuePair <MDPConfiguration, MDPState>(step, nextState));
                        }
                    }

                    if (step.DisIndex == -1)
                    {
                        if (currentDistriIndex >= 0)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                        }

                        Distribution newTrivialDis = new Distribution(step.Event);
                        newTrivialDis.AddProbStatePair(1, nextState);
                        current.Value.AddDistribution(newTrivialDis);
                    }
                    else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                    {
                        current.Value.AddDistribution(newDis);
                        newDis = new Distribution(Constants.TAU);
                        newDis.AddProbStatePair(step.Probability, nextState);
                    }
                    else
                    {
                        newDis.AddProbStatePair(step.Probability, nextState);
                    }

                    currentDistriIndex = step.DisIndex;
                }

                if (currentDistriIndex >= 0)
                {
                    current.Value.AddDistribution(newDis);
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return(mdp);
        }
Example #15
0
        private MDP BuildMDP()
        {
            Stack<KeyValuePair<MDPConfiguration, MDPState>> working = new Stack<KeyValuePair<MDPConfiguration, MDPState>>(1024);

            string initID = InitialStep.GetID();
            MDPState init = new MDPState(initID);
            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return mdp;
                }

                KeyValuePair<MDPConfiguration, MDPState> current = working.Pop();
                IEnumerable<MDPConfiguration> list = current.Key.MakeOneMoveLocal();
                VerificationOutput.Transitions += list.Count();

                //check if it is one of the target state
                //if (list.Length == 0)
                if(current.Key.IsDeadLock)
                {
                    if (isNotTerminationTesting || current.Key.Event != Constants.TERMINATION)
                    {
                        mdp.AddTargetStates(current.Value);
                    }
                }
                else
                {
                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    //for (int i = 0; i < list.Length; i++)
                    foreach (var step in list)
                    {
                        //MDPConfiguration step = list[i];
                        string stepID = step.GetID();
                        MDPState nextState;

                        if (!mdp.States.TryGetValue(stepID, out nextState))
                        {
                            nextState = new MDPState(stepID);
                            mdp.AddState(nextState);
                            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                        }

                        if (step.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                current.Value.AddDistribution(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(step.Event);
                            newTrivialDis.AddProbStatePair(1, nextState);
                            current.Value.AddDistribution(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(step.Probability, nextState);
                        }

                        currentDistriIndex = step.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        current.Value.AddDistribution(newDis);
                    }
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return mdp;
        }