// Perform the redDFS
        public bool SwarmNestedDFSDepthFirstSearchRed(LocalPair s, Stack <LocalPair> BlueStack, Dictionary <string, List <string> > OutgoingTransitionTable, Dictionary <string, StateColor> colorData)
        {
            //store the expended event step of a node to avoid multiple invocation of the make one move.
            Dictionary <string, List <LocalPair> > ExpendedNode = new Dictionary <string, List <LocalPair> >(256);

            Stack <LocalPair> RedStack = new Stack <LocalPair>(5000);

            RedStack.Push(s);

            do
            {
                if (CancelRequested || StopMutliCoreThreads)
                {
                    return(false);
                }

                LocalPair         pair    = RedStack.Peek();
                string            v       = pair.GetCompressedState();
                ConfigurationBase evt     = pair.configuration;
                string            BAState = pair.state;

                List <string> outgoing = OutgoingTransitionTable[v];

                bool redDone = true;

                if (!ExpendedNode.ContainsKey(v))
                {
                    //ConfigurationBase[] list = evt.MakeOneMove().ToArray();
                    IEnumerable <ConfigurationBase> list = evt.MakeOneMove();
                    pair.SetEnabled(list, FairnessType);
                    List <LocalPair> product = LocalPair.NextLocal(BA, list, BAState);
                    ExpendedNode.Add(v, product);
                }

                List <LocalPair> neighbourList = ExpendedNode[v];

                //transverse all neighbour nodes
                for (int k = neighbourList.Count - 1; k >= 0; k--)
                {
                    LocalPair  step           = neighbourList[k];
                    string     tmp            = step.GetCompressedState();
                    StateColor neighbourColor = colorData[tmp];

                    // if the neighbour node is blue
                    if (neighbourColor.IsBlue())
                    {
                        //only add the first unvisited node
                        //for the second or more unvisited steps, ignore at the monent
                        if (redDone)
                        {
                            neighbourColor.SetRed();
                            RedStack.Push(step);
                            redDone = true;
                            neighbourList.RemoveAt(k);
                        }
                    }
                    // if the neighbour is cyan
                    // report cycle
                    else if (neighbourColor.IsCyan())
                    {
                        SwarmNestedDFSReportRedCycle(s, step, pair, BlueStack, RedStack, colorData, OutgoingTransitionTable);
                        return(true);
                    }
                    else
                    {
                        neighbourList.RemoveAt(k);
                    }
                }

                if (redDone)
                {
                    RedStack.Pop();
                }
            } while (RedStack.Count > 0);

            return(false);
        }
        /// <summary>
        /// The function of each worker in swarm NDFS
        /// </summary>
        /// <returns></returns>
        public void SwarmNestedDFSModelCheckingWorker()
        {
            Dictionary <string, List <string> > OutgoingTransitionTable = new Dictionary <string, List <string> >(Ultility.Ultility.MC_INITIAL_SIZE);
            List <LocalPair> initials = LocalPair.GetInitialPairsLocal(BA, InitialStep);

            if (initials.Count == 0)
            {
                VerificationOutput.VerificationResult = VerificationResultType.VALID;
                return;
            }

            Stack <LocalPair> BlueStack = new Stack <LocalPair>(5000);
            Dictionary <string, StateColor> colorData = new Dictionary <string, StateColor>(5000);

            int threadId;
            // Create random variable with different seed for each thread
            Random rand; // helps different threads access different region of the graph

            lock (MultiCoreLock)
            {
                threadId = MultiCoreSeed;
                rand     = new Random(MultiCoreSeed);
                MultiCoreSeed++;
            }


            // Create the list of initial states
            // May apply randomness here to increase performance
            int[] permutation = generatePermutation(initials.Count, rand);

            for (int z = 0; z < initials.Count; z++)
            {
                LocalPair initState = initials[permutation[z]];
                BlueStack.Push(initState);
                string ID = initState.GetCompressedState();
                colorData.Add(ID, new StateColor());
                OutgoingTransitionTable.Add(ID, new List <string>(8));
            }

            //store the expended event step of a node to avoid multiple invocation of the make one move.
            Dictionary <string, List <LocalPair> > ExpendedNode = new Dictionary <string, List <LocalPair> >(1024);

            do
            {
                if (CancelRequested || StopMutliCoreThreads)
                {
                    return;
                }

                LocalPair         pair    = BlueStack.Peek();
                ConfigurationBase evt     = pair.configuration;
                string            BAState = pair.state;

                string v = pair.GetCompressedState();

                List <string> outgoing = OutgoingTransitionTable[v];

                StateColor nodeColor = colorData[v];

                if (nodeColor.IsWhite())
                {
                    nodeColor.SetCyan();
                }

                bool blueDone = true;

                // Initialize the node if first time visited
                if (!ExpendedNode.ContainsKey(v))
                {
                    //ConfigurationBase[] configList = evt.MakeOneMove().ToArray();
                    IEnumerable <ConfigurationBase> configList = evt.MakeOneMove();
                    pair.SetEnabled(configList, FairnessType);
                    List <LocalPair> product = LocalPair.NextLocal(BA, configList, BAState);
                    ExpendedNode.Add(v, product);

                    for (int k = product.Count - 1; k >= 0; k--)
                    {
                        LocalPair step = product[k];
                        string    tmp  = step.GetCompressedState();
                        //update the incoming and outgoing edges
                        outgoing.Add(tmp);
                        if (!colorData.ContainsKey(tmp))
                        {
                            colorData.Add(tmp, new StateColor());
                            OutgoingTransitionTable.Add(tmp, new List <string>(8));
                        }
                    }
                }

                List <LocalPair> list = ExpendedNode[v];

                //transverse all neighbour nodes
                for (int k = list.Count - 1; k >= 0; k--)
                {
                    int randIndex = rand.Next(list.Count);
                    //int randIndex = list.Count - 1;
                    LocalPair  step           = list[randIndex];
                    string     tmp            = step.GetCompressedState();
                    StateColor neighbourColor = colorData[tmp];

                    //if the neighbour node is white
                    if (neighbourColor.IsWhite())
                    {
                        if (blueDone)
                        {
                            BlueStack.Push(step);
                            blueDone = false;
                            list.RemoveAt(randIndex);
                            break;
                        }
                    }
                    // if the neighbour node is cyan,
                    // and either this node or the neibour node is the accept state
                    // then report cycle
                    else if (neighbourColor.IsCyan())
                    {
                        if (step.state.EndsWith(Constants.ACCEPT_STATE) || pair.state.EndsWith(Constants.ACCEPT_STATE))
                        {
                            SwarmNestedDFSReportBlueCycle(step, pair, BlueStack, colorData, OutgoingTransitionTable);
                            return;
                        }
                        else
                        {
                            list.RemoveAt(randIndex);
                        }
                    }
                    // if the neighbour node is either blue or red,
                    // can remove from the list
                    else
                    {
                        list.RemoveAt(randIndex);
                    }
                }

                if (blueDone)
                {
                    BlueStack.Pop();

                    // If the current node is an accept state,
                    // do the red DFS
                    if (pair.state.EndsWith(Constants.ACCEPT_STATE))
                    {
                        if (evt.IsDeadLock)
                        {
                            lock (MultiCoreLock)
                            {
                                StopMutliCoreThreads = true;
                                Dictionary <string, LocalPair> LoopPairs = new Dictionary <string, LocalPair>();
                                LoopPairs.Add(v, pair);
                                MultiCoreLocalTaskStack          = BlueStack;
                                MultiCoreResultedLoop            = LoopPairs;
                                MultiCoreOutgoingTransitionTable = OutgoingTransitionTable;
                                return;
                            }
                        }


                        bool stop = SwarmNestedDFSDepthFirstSearchRed(pair, BlueStack, OutgoingTransitionTable, colorData);

                        if (stop)
                        {
                            return;
                        }

                        nodeColor.SetRed();
                    }
                    else
                    {
                        nodeColor.SetBlue();
                    }
                }
            } while (BlueStack.Count > 0);

            StopMutliCoreThreads = true;
            VerificationOutput.VerificationResult = VerificationResultType.VALID;
            VerificationOutput.NoOfStates         = colorData.Count;
            return;
        }
Beispiel #3
0
        /// <summary>
        /// Run the verification using the Nested DFS algorithm and get the result.
        /// Based on:
        /// A Note on On-The-Fly Verification Algorithms
        /// http://dl.acm.org/citation.cfm?id=2140670
        /// Stefan Schwoon and Javier Esparza
        /// Proceeding TACAS'05 Proceedings of the 11th international conference on
        /// Tools and Algorithms for the Construction and Analysis of Systems
        /// Springer-Verlag Berlin, Heidelberg, 2005
        /// </summary>
        /// <returns></returns>
        public void NestedDFSModelChecking()
        {
            Dictionary <string, List <string> > OutgoingTransitionTable = new Dictionary <string, List <string> >(Ultility.Ultility.MC_INITIAL_SIZE);

            VerificationOutput.CounterExampleTrace = null;

            List <LocalPair> initials = LocalPair.GetInitialPairsLocal(BA, InitialStep);

            if (initials.Count == 0)
            {
                VerificationOutput.VerificationResult = VerificationResultType.VALID;
                return;
            }

            Stack <LocalPair>             BlueStack = new Stack <LocalPair>(5000);
            StringDictionary <StateColor> colorData = new StringDictionary <StateColor>(5000);

            for (int z = 0; z < initials.Count; z++)
            {
                LocalPair initState = initials[z];
                BlueStack.Push(initState);
                string ID = initState.GetCompressedState();
                colorData.Add(ID, new StateColor());
                OutgoingTransitionTable.Add(ID, new List <string>(8));
            }

            //store the expended event step of a node to avoid multiple invocation of the make one move.
            Dictionary <string, List <LocalPair> > ExpendedNode = new Dictionary <string, List <LocalPair> >(1024);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = colorData.Count; // VisitedWithID.Count;
                    return;
                }

                LocalPair         pair    = BlueStack.Peek();
                ConfigurationBase evt     = pair.configuration;
                string            BAState = pair.state;

                string v = pair.GetCompressedState();

                List <string> outgoing = OutgoingTransitionTable[v];

                StateColor nodeColor = colorData.GetContainsKey(v);

                if (nodeColor.IsWhite())
                {
                    nodeColor.SetCyan();
                }

                bool blueDone = true;

                if (ExpendedNode.ContainsKey(v))
                {
                    List <LocalPair> list = ExpendedNode[v];

                    if (list.Count > 0)
                    {
                        //transverse all neighbour nodes
                        for (int k = list.Count - 1; k >= 0; k--)
                        {
                            LocalPair  step           = list[k];
                            string     tmp            = step.GetCompressedState();
                            StateColor neighbourColor = colorData.GetContainsKey(tmp);

                            //if the neighbour node is white
                            if (neighbourColor.IsWhite())
                            {
                                //only add the first unvisited node
                                //for the second or more unvisited steps, ignore at the monent
                                if (blueDone)
                                {
                                    BlueStack.Push(step);
                                    blueDone = false;
                                    list.RemoveAt(k);
                                }
                            }

                            // if the neighbour node is cyan,
                            // and either this node or the neibour node is the accept state
                            // then report cycle
                            else if (neighbourColor.IsCyan())
                            {
                                if (step.state.EndsWith(Constants.ACCEPT_STATE) || pair.state.EndsWith(Constants.ACCEPT_STATE))
                                {
                                    // Report cycle
                                    ReportBlueCycle(step, pair, BlueStack, colorData, OutgoingTransitionTable);
                                    return;
                                }
                                else
                                {
                                    list.RemoveAt(k);
                                }
                            }
                            // if the neighbour node is either blue or red,
                            // can remove from the list
                            else
                            {
                                list.RemoveAt(k);
                            }
                        }
                    }
                }
                else
                {
                    //ConfigurationBase[] list = evt.MakeOneMove().ToArray();
                    IEnumerable <ConfigurationBase> list = evt.MakeOneMove();
                    pair.SetEnabled(list, FairnessType);
                    List <LocalPair> product = LocalPair.NextLocal(BA, list, BAState);

                    //count the transitions visited
                    VerificationOutput.Transitions += product.Count;

                    for (int k = product.Count - 1; k >= 0; k--)
                    {
                        LocalPair  step           = product[k];
                        string     tmp            = step.GetCompressedState();
                        StateColor neighbourColor = colorData.GetContainsKey(tmp);

                        if (neighbourColor != null)
                        {
                            //update the incoming and outgoing edges
                            outgoing.Add(tmp);

                            //if this node is still not visited
                            if (neighbourColor.IsWhite())
                            {
                                //only add the first unvisited node
                                //for the second or more unvisited steps, ignore at the monent
                                if (blueDone)
                                {
                                    BlueStack.Push(step);
                                    blueDone = false;
                                    product.RemoveAt(k);
                                }
                            }
                            // if the neighbour node is cyan,
                            // and either this node or the neibour node is the accept state
                            // then report cycle
                            else if (neighbourColor.IsCyan())
                            {
                                if (step.state.EndsWith(Constants.ACCEPT_STATE) || pair.state.EndsWith(Constants.ACCEPT_STATE))
                                {
                                    // Report cycle
                                    ReportBlueCycle(step, pair, BlueStack, colorData, OutgoingTransitionTable);
                                    return;
                                }
                                else
                                {
                                    product.RemoveAt(k);
                                }
                            }
                            // if the neighbour node is either blue or red,
                            // can remove from the list
                            else
                            {
                                product.RemoveAt(k);
                            }
                        }

                        // If the node is not initiated
                        else
                        {
                            colorData.Add(tmp, new StateColor());
                            OutgoingTransitionTable.Add(tmp, new List <string>(8));
                            outgoing.Add(tmp);

                            if (blueDone)
                            {
                                BlueStack.Push(step);
                                blueDone = false;
                                product.RemoveAt(k);
                            }
                        }
                    }

                    //create the remaining steps as the expending list for v
                    ExpendedNode.Add(v, product);
                }

                if (blueDone)
                {
                    BlueStack.Pop();

                    // If the current node is an accept state,
                    // do the red DFS
                    if (pair.state.EndsWith(Constants.ACCEPT_STATE))
                    {
                        if (evt.IsDeadLock)
                        {
                            VerificationOutput.VerificationResult = VerificationResultType.INVALID;
                            VerificationOutput.NoOfStates         = colorData.Count;
                            Dictionary <string, LocalPair> LoopPairs = new Dictionary <string, LocalPair>();
                            LoopPairs.Add(v, pair);
                            LocalTaskStack = BlueStack;
                            LocalGetCounterExample(LoopPairs, OutgoingTransitionTable);
                            return;
                        }

                        bool stop = DepthFirstSearchRed(pair, BlueStack, OutgoingTransitionTable, colorData);

                        if (stop)
                        {
                            return;
                        }

                        nodeColor.SetRed();
                    }
                    else
                    {
                        nodeColor.SetBlue();
                    }
                }
            } while (BlueStack.Count > 0);

            VerificationOutput.VerificationResult = VerificationResultType.VALID;
            VerificationOutput.NoOfStates         = colorData.Count;
            return;
        }