public override InvariantAnalysisResult[] CheckInvariants(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, params Formula[] invariants)
{
var checker = new QualitativeChecker <SafetySharpRuntimeModel>(createModel);
checker.Configuration = _analysisConfiguration;
return(checker.CheckInvariants(invariants));
}
/// <summary>
/// Computes the minimal critical sets for the <paramref name="hazard" />.
/// </summary>
/// <param name="createModel">The creator for the model that should be checked.</param>
/// <param name="hazard">The hazard the minimal critical sets should be computed for.</param>
/// <param name="maxCardinality">
/// The maximum cardinality of the fault sets that should be checked. By default, all minimal
/// critical fault sets are determined.
/// </param>
/// <param name="backend">Determines the safety analysis backend that is used during the analysis.</param>
public static SafetyAnalysisResults <TExecutableModel> AnalyzeHazard(CoupledExecutableModelCreator <TExecutableModel> createModel, Formula hazard, int maxCardinality = Int32.MaxValue,
SafetyAnalysisBackend backend = SafetyAnalysisBackend.FaultOptimizedOnTheFly)
{
return(new SafetyAnalysis <TExecutableModel> {
Backend = backend
}.ComputeMinimalCriticalSets(createModel, hazard, maxCardinality));
}
/// <summary>
/// Checks whether the <paramref name="formula" /> holds in all states of the <paramref name="model" />.
/// </summary>
/// <param name="createModel">The creator for the model that should be checked.</param>
/// <param name="checkArgument">The argument passed to LtsMin that indicates which kind of check to perform.</param>
private AnalysisResult <SafetySharpRuntimeModel> Check(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, string checkArgument)
{
try
{
using (var modelFile = new TemporaryFile("ssharp"))
{
File.WriteAllBytes(modelFile.FilePath, RuntimeModelSerializer.Save((ModelBase)createModel.SourceModel, createModel.StateFormulasToCheckInBaseModel));
try
{
CreateProcess(modelFile.FilePath, checkArgument);
Run();
}
catch (Win32Exception e)
{
throw new InvalidOperationException(
"Failed to start LTSMin. Ensure that pins2lts-seq.exe can be found by either copying it next " +
"to the executing assembly or by adding it to the system path. The required cygwin dependencies " +
$"must also be available. The original error message was: {e.Message}", e);
}
var success = InterpretExitCode(_ltsMin.ExitCode);
return(new AnalysisResult <SafetySharpRuntimeModel> {
FormulaHolds = success
});
}
}
finally
{
_ltsMin = null;
}
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal LtmdpExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, AnalysisConfiguration configuration)
: base(runtimeModelCreator, 0, configuration)
{
var formulas = RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_stepGraph = new LtmdpStepGraph();
_cachedLabeledStates = new LtmdpCachedLabeledStates <TExecutableModel>(TemporaryStateStorage, configuration.SuccessorCapacity, _stepGraph, formulas);
bool useForwardOptimization;
switch (configuration.MomentOfIndependentFaultActivation)
{
case MomentOfIndependentFaultActivation.AtStepBeginning:
case MomentOfIndependentFaultActivation.OnFirstMethodWithoutUndo:
useForwardOptimization = false;
break;
case MomentOfIndependentFaultActivation.OnFirstMethodWithUndo:
useForwardOptimization = true;
break;
default:
throw new ArgumentOutOfRangeException();
}
_ltmdpChoiceResolver = new LtmdpChoiceResolver(_stepGraph, useForwardOptimization);
ChoiceResolver = _ltmdpChoiceResolver;
RuntimeModel.SetChoiceResolver(ChoiceResolver);
_allowFaultsOnInitialTransitions = configuration.AllowFaultsOnInitialTransitions;
_activateIndependentFaultsAtStepBeginning =
configuration.MomentOfIndependentFaultActivation == MomentOfIndependentFaultActivation.AtStepBeginning;
}
protected void GenerateStateSpace(params IComponent[] components)
{
_modelCreator = SafetySharpRuntimeModel.CreateExecutedModelCreator(TestModel.InitializeModel(components), new ExecutableStateFormula(() => true));
var configuration = AnalysisConfiguration.Default;
configuration.ModelCapacity = ModelCapacityByMemorySize.Small;
configuration.StackCapacity = 10000;
configuration.CpuCount = 1;
configuration.DefaultTraceOutput = Output.TextWriterAdapter();
configuration.AllowFaultsOnInitialTransitions = AllowFaultsOnInitialTransitions;
var analysisModelCreator = new AnalysisModelCreator(() => new ActivationMinimalExecutedModel <SafetySharpRuntimeModel>(_modelCreator, 0, configuration));
var checker = new InvariantChecker(analysisModelCreator,
configuration,
formulaIndex: 0);
_result = checker.Check();
CounterExample.ShouldBe(null);
Output.Log($"States: {_result.StateCount}");
Output.Log($"Actual Transitions: {_result.TransitionCount}");
Output.Log($"Computed Transitions: {_result.ComputedTransitionCount}");
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="formulas">The formulas that should be evaluated for each state.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal ActivationMinimalExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, int stateHeaderBytes, Func <bool>[] formulas, AnalysisConfiguration configuration)
: base(runtimeModelCreator, stateHeaderBytes, configuration)
{
formulas = formulas ?? RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_transitions = new ActivationMinimalTransitionSetBuilder <TExecutableModel>(TemporaryStateStorage, configuration.SuccessorCapacity, formulas);
_stateConstraints = RuntimeModel.StateConstraints;
bool useForwardOptimization;
switch (configuration.MomentOfIndependentFaultActivation)
{
case MomentOfIndependentFaultActivation.AtStepBeginning:
case MomentOfIndependentFaultActivation.OnFirstMethodWithoutUndo:
useForwardOptimization = false;
break;
case MomentOfIndependentFaultActivation.OnFirstMethodWithUndo:
useForwardOptimization = true;
break;
default:
throw new ArgumentOutOfRangeException();
}
ChoiceResolver = new NondeterministicChoiceResolver(useForwardOptimization);
FaultSet.CheckFaultCount(RuntimeModel.Faults.Length);
RuntimeModel.SetChoiceResolver(ChoiceResolver);
_allowFaultsOnInitialTransitions = configuration.AllowFaultsOnInitialTransitions;
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="createModel">A factory function that creates the model instance that should be executed.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal ExecutedModel(CoupledExecutableModelCreator <TExecutableModel> createModel, int stateHeaderBytes)
{
Requires.NotNull(createModel, nameof(createModel));
RuntimeModelCreator = createModel;
RuntimeModel = createModel.Create(stateHeaderBytes);
}
/// <summary>
/// Initizializes the model that should be analyzed.
/// </summary>
/// <param name="configuration">The configuration that should be used for the analyses.</param>
/// <param name="createFreshModel">The creator for the model that should be checked.</param>
/// <param name="hazard">The hazard that should be analyzed.</param>
internal void InitializeModel(AnalysisConfiguration configuration, CoupledExecutableModelCreator <TExecutableModel> createFreshModel, Formula hazard)
{
RuntimeModelCreator = createFreshModel;
ForcedFaults = new FaultSet(createFreshModel.FaultsInBaseModel.Where(fault => fault.Activation == Activation.Forced));
SuppressedFaults = new FaultSet(createFreshModel.FaultsInBaseModel.Where(fault => fault.Activation == Activation.Suppressed));
InitializeModel(configuration, hazard);
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="createModel">A factory function that creates the model instance that should be executed.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal ExecutedModel(CoupledExecutableModelCreator <TExecutableModel> createModel, int stateHeaderBytes, AnalysisConfiguration configuration)
{
Requires.NotNull(createModel, nameof(createModel));
RuntimeModelCreator = createModel;
RuntimeModel = createModel.Create(stateHeaderBytes);
TemporaryStateStorage = new TemporaryStateStorage(ModelStateVectorSize, configuration.SuccessorCapacity);
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="counterExample">The counter example that should be simulated.</param>
public Simulator(CoupledExecutableModelCreator <TExecutableModel> modelCreator, CounterExample counterExample)
{
Requires.NotNull(counterExample, nameof(counterExample));
RuntimeModel = modelCreator.Create(0);
_counterExample = new ExecutableCounterExample <TExecutableModel>(RuntimeModel, counterExample);
Reset();
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="successorStateCapacity">The maximum number of successor states supported per state.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal LtmcExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, int stateHeaderBytes, long successorStateCapacity)
: base(runtimeModelCreator, stateHeaderBytes)
{
var formulas = RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_transitions = new LtmcTransitionSetBuilder <TExecutableModel>(RuntimeModel, successorStateCapacity, formulas);
_ltmcChoiceResolver = new LtmcChoiceResolver();
ChoiceResolver = _ltmcChoiceResolver;
RuntimeModel.SetChoiceResolver(ChoiceResolver);
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="createModel">The creator for the model that should be checked.</param>
/// <param name="hazard">The hazard the analysis was conducated for.</param>
/// <param name="suppressedFaults">The faults whose activations have been completely suppressed during analysis.</param>
/// <param name="forcedFaults">The faults whose activations have been forced during analysis.</param>
/// <param name="heuristics">The heuristics that are used during the analysis.</param>
/// <param name="activationBehavior">The fault acitvation behavior used during the analysis.</param>
internal SafetyAnalysisResults(CoupledExecutableModelCreator <TExecutableModel> createModel, Formula hazard,
IEnumerable <Fault> suppressedFaults, IEnumerable <Fault> forcedFaults,
IEnumerable <IFaultSetHeuristic> heuristics, FaultActivationBehavior activationBehavior)
{
RuntimeModelCreator = createModel;
Hazard = hazard;
SuppressedFaults = suppressedFaults;
ForcedFaults = forcedFaults;
Heuristics = heuristics.ToArray(); // make a copy so that later changes to the heuristics don't affect the results
FaultActivationBehavior = activationBehavior;
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="createModel">A factory function that creates the model instance that should be executed.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal ExecutedModel(CoupledExecutableModelCreator <TExecutableModel> createModel, int stateHeaderBytes, AnalysisConfiguration configuration)
{
Requires.NotNull(createModel, nameof(createModel));
RuntimeModelCreator = createModel;
var runtimeModel = createModel.Create(stateHeaderBytes);
RuntimeModel = runtimeModel;
TemporaryStateStorage = new TemporaryStateStorage(ModelStateVectorSize, configuration.SuccessorCapacity);
SavedActivations = runtimeModel.NondeterministicFaults.Select(fault => fault.Activation).ToArray();
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="formulas">The formulas that should be evaluated for each state.</param>
/// <param name="successorStateCapacity">The maximum number of successor states supported per state.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal ActivationMinimalExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, int stateHeaderBytes, Func <bool>[] formulas, long successorStateCapacity)
: base(runtimeModelCreator, stateHeaderBytes)
{
formulas = formulas ?? RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_transitions = new ActivationMinimalTransitionSetBuilder <TExecutableModel>(RuntimeModel, successorStateCapacity, formulas);
_stateConstraints = RuntimeModel.StateConstraints;
ChoiceResolver = new NondeterministicChoiceResolver();
RuntimeModel.SetChoiceResolver(ChoiceResolver);
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="successorStateCapacity">The maximum number of successor states supported per state.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal LtmdpExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, int stateHeaderBytes, long successorStateCapacity)
: base(runtimeModelCreator, stateHeaderBytes)
{
var formulas = RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_stepGraph = new LtmdpStepGraph();
_cachedLabeledStates = new LtmdpCachedLabeledStates <TExecutableModel>(RuntimeModel, successorStateCapacity, _stepGraph, formulas);
_ltmdpChoiceResolver = new LtmdpChoiceResolver(_stepGraph);
ChoiceResolver = _ltmdpChoiceResolver;
RuntimeModel.SetChoiceResolver(ChoiceResolver);
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
internal LtmcExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, AnalysisConfiguration configuration)
: base(runtimeModelCreator, 0, configuration)
{
var formulas = RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_transitions = new LtmcTransitionSetBuilder <TExecutableModel>(TemporaryStateStorage, configuration.SuccessorCapacity, formulas);
var useForwardOptimization = configuration.EnableStaticPruningOptimization;
_ltmcChoiceResolver = new LtmcChoiceResolver(useForwardOptimization);
ChoiceResolver = _ltmcChoiceResolver;
RuntimeModel.SetChoiceResolver(ChoiceResolver);
_allowFaultsOnInitialTransitions = configuration.AllowFaultsOnInitialTransitions;
}
/// <summary>
/// Checks the invariant encoded into the model created by <paramref name="createModel" />.
/// </summary>
public AnalysisResult <TExecutableModel> CheckInvariant(CoupledExecutableModelCreator <TExecutableModel> createModel, int formulaIndex)
{
// We have to track the state vector layout here; this will nondeterministically store some model instance of
// one of the workers; but since all state vectors are the same, we don't care
ExecutedModel <TExecutableModel> model = null;
Func <AnalysisModel <TExecutableModel> > createAnalysisModelFunc = () =>
model = new ActivationMinimalExecutedModel <TExecutableModel>(createModel, 0, Configuration.SuccessorCapacity);
var createAnalysisModel = new AnalysisModelCreator <TExecutableModel>(createAnalysisModelFunc);
using (var checker = new InvariantChecker <TExecutableModel>(createAnalysisModel, OutputWritten, Configuration, formulaIndex))
{
var result = checker.Check();
return(result);
}
}
/// <summary>
/// Generates a <see cref="StateGraph{TExecutableModel}" /> for the model created by <paramref name="createModel" />.
/// </summary>
internal StateGraph <TExecutableModel> GenerateStateGraph(CoupledExecutableModelCreator <TExecutableModel> createModel)
{
// We have to track the state vector layout here; this will nondeterministically store some model instance of
// one of the workers; but since all state vectors are the same, we don't care
ExecutedModel <TExecutableModel> model = null;
Func <AnalysisModel <TExecutableModel> > createAnalysisModelFunc = () =>
model = new ActivationMinimalExecutedModel <TExecutableModel>(createModel, 0, Configuration.SuccessorCapacity);
var createAnalysisModel = new AnalysisModelCreator <TExecutableModel>(createAnalysisModelFunc);
using (var checker = new StateGraphGenerator <TExecutableModel>(createAnalysisModel, OutputWritten, Configuration))
{
var stateGraph = checker.GenerateStateGraph();
return(stateGraph);
}
}
public override AnalysisResult <SafetySharpRuntimeModel> CheckInvariant(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, Formula formula)
{
var formulaIndex = Array.FindIndex(createModel.StateFormulasToCheckInBaseModel, stateFormula =>
{
var isEqual = IsFormulasStructurallyEquivalentVisitor.Compare(stateFormula, formula);
return(isEqual);
}
);
if (formulaIndex == -1)
{
throw new Exception($"Input formula is not checked directly. Use {nameof(AnalysisTestsWithQualitative)} instead");
}
return(modelChecker.CheckInvariant(createModel, formulaIndex));
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="formulas">The formulas that should be evaluated for each state.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
internal ActivationMinimalExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, int stateHeaderBytes, Func <bool>[] formulas, AnalysisConfiguration configuration)
: base(runtimeModelCreator, stateHeaderBytes, configuration)
{
formulas = formulas ?? RuntimeModel.Formulas.Select(formula => FormulaCompilationVisitor <TExecutableModel> .Compile(RuntimeModel, formula)).ToArray();
_transitions = new ActivationMinimalTransitionSetBuilder <TExecutableModel>(TemporaryStateStorage, configuration.SuccessorCapacity, formulas);
_stateConstraints = RuntimeModel.StateConstraints;
var useForwardOptimization = configuration.EnableStaticPruningOptimization;
ChoiceResolver = new NondeterministicChoiceResolver(useForwardOptimization);
FaultSet.CheckFaultCount(RuntimeModel.Faults.Length);
RuntimeModel.SetChoiceResolver(ChoiceResolver);
_allowFaultsOnInitialTransitions = configuration.AllowFaultsOnInitialTransitions;
}
/// <summary>
/// Checks whether the <paramref name="formula" /> holds in all states of the <paramref name="model" />.
/// </summary>
/// <param name="createModel">The creator for the model that should be checked.</param>
/// <param name="invariant">The invariant that should be checked.</param>
internal InvariantAnalysisResult CheckInvariant(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, Formula invariant)
{
Requires.NotNull(createModel, nameof(createModel));
Requires.NotNull(invariant, nameof(invariant));
if (!invariant.IsStateFormula())
{
throw new InvalidOperationException("Invariants must be non-temporal state formulas.");
}
var transformationVisitor = new LtsMinLtlTransformer();
transformationVisitor.Visit(invariant);
return(Check(createModel,
$"--invariant=\"({ConstructionStateName} == 1) || ({transformationVisitor.TransformedFormula})\""));
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="context">The context of the traversal process.</param>
/// <param name="transitionSizeInBytes">The size of a transition in bytes.</param>
/// <param name="model">The runtime model the state graph is generated for.</param>
/// <param name="createModel">
/// The factory function that should be used to create instances of the <see cref="RuntimeModel" />
/// the state graph is generated for.
/// </param>
internal StateGraph(TraversalContext context, int transitionSizeInBytes,
TExecutableModel model, CoupledExecutableModelCreator <TExecutableModel> createModel)
{
Requires.NotNull(context, nameof(context));
TransitionSize = transitionSizeInBytes;
RuntimeModel = model;
RuntimeModelCreator = createModel;
_stateStorage = context.States;
_transitionCapacity = context.ModelCapacity.MemoryLimitTransitions.Value;
_transitionsBuffer.Resize(_transitionCapacity, zeroMemory: false);
_stateMapBuffer.Resize(context.ModelCapacity.NumberOfStates * sizeof(TransitionRange), zeroMemory: false);
_transitions = _transitionsBuffer.Pointer;
_stateMap = (TransitionRange *)_stateMapBuffer.Pointer;
}
/// <summary>
/// Checks whether the <paramref name="formula" /> holds in all states of the <paramref name="model" />.
/// </summary>
/// <param name="createModel">The creator for the model that should be checked.</param>
/// <param name="formula">The formula that should be checked.</param>
public AnalysisResult <SafetySharpRuntimeModel> Check(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, Formula formula)
{
Requires.NotNull(createModel, nameof(createModel));
Requires.NotNull(formula, nameof(formula));
var visitor = new IsLtlFormulaVisitor();
visitor.Visit(formula);
if (!visitor.IsLtlFormula)
{
throw new NotSupportedException("CTL model checking is currently not supported with LtsMin.");
}
var transformationVisitor = new LtsMinLtlTransformer();
transformationVisitor.Visit(new UnaryFormula(formula, UnaryOperator.Next));
return(Check(createModel, $"--ltl=\"{transformationVisitor.TransformedFormula}\""));
}
public abstract InvariantAnalysisResult Check(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, Formula formula);
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="runtimeModelCreator">A factory function that creates the model instance that should be executed.</param>
/// <param name="stateHeaderBytes">
/// The number of bytes that should be reserved at the beginning of each state vector for the model checker tool.
/// </param>
/// <param name="successorStateCapacity">The maximum number of successor states supported per state.</param>
internal ActivationMinimalExecutedModel(CoupledExecutableModelCreator <TExecutableModel> runtimeModelCreator, int stateHeaderBytes, long successorStateCapacity)
: this(runtimeModelCreator, stateHeaderBytes, null, successorStateCapacity)
{
}
/// <summary>
/// Computes the minimal critical sets for the <paramref name="hazard" />.
/// </summary>
/// <param name="createModel">The creator for the model that should be checked.</param>
/// <param name="hazard">The hazard the minimal critical sets should be computed for.</param>
/// <param name="maxCardinality">
/// The maximum cardinality of the fault sets that should be checked. By default, all minimal
/// critical fault sets are determined.
/// </param>
public SafetyAnalysisResults <TExecutableModel> ComputeMinimalCriticalSets(CoupledExecutableModelCreator <TExecutableModel> createModel, Formula hazard, int maxCardinality = Int32.MaxValue)
{
Requires.NotNull(createModel, nameof(createModel));
Requires.NotNull(hazard, nameof(hazard));
ConsoleHelpers.WriteLine("Running Deductive Cause Consequence Analysis.");
var heuristicWatch = new Stopwatch();
var stopwatch = new Stopwatch();
stopwatch.Start();
var allFaults = createModel.FaultsInBaseModel;
FaultSet.CheckFaultCount(allFaults.Length);
var forcedFaults = allFaults.Where(fault => fault.Activation == Activation.Forced).ToArray();
var suppressedFaults = allFaults.Where(fault => fault.Activation == Activation.Suppressed).ToArray();
var nondeterministicFaults = allFaults.Where(fault => fault.Activation == Activation.Nondeterministic).ToArray();
var nonSuppressedFaults = allFaults.Where(fault => fault.Activation != Activation.Suppressed).ToArray();
ConsoleHelpers.WriteLine();
ConsoleHelpers.WriteLine($"Of the {allFaults.Length} faults contained in the model,");
ConsoleHelpers.WriteLine($" {suppressedFaults.Length} faults are suppressed,");
ConsoleHelpers.WriteLine($" {forcedFaults.Length} faults are forced, and");
ConsoleHelpers.WriteLine($" {nondeterministicFaults.Length} faults are nondeterministically activated.");
ConsoleHelpers.WriteLine();
_suppressedSet = new FaultSet(suppressedFaults);
_forcedSet = new FaultSet(forcedFaults);
var isComplete = true;
// Remove information from previous analyses
Reset(createModel.FaultsInBaseModel);
// Initialize the backend, the model, and the analysis results
switch (Backend)
{
case SafetyAnalysisBackend.FaultOptimizedOnTheFly:
_backend = new FaultOptimizationBackend <TExecutableModel>();
break;
case SafetyAnalysisBackend.FaultOptimizedStateGraph:
_backend = new StateGraphBackend <TExecutableModel>();
break;
default:
throw new ArgumentOutOfRangeException();
}
_backend.Output = Output;
_backend.InitializeModel(Configuration, createModel, hazard);
_results = new SafetyAnalysisResults <TExecutableModel>(createModel, hazard, suppressedFaults, forcedFaults, Heuristics, FaultActivationBehavior);
// Remember all safe sets of current cardinality - we need them to generate the next power set level
var currentSafe = new HashSet <FaultSet>();
// We check fault sets by increasing cardinality; this is, we check the empty set first, then
// all singleton sets, then all sets with two elements, etc. We don't check sets that we
// know are going to be critical sets due to monotonicity
for (var cardinality = 0; cardinality <= nonSuppressedFaults.Length; ++cardinality)
{
// Generate the sets for the current level that we'll have to check
var sets = GeneratePowerSetLevel(cardinality, nonSuppressedFaults, currentSafe);
currentSafe.Clear();
// Remove all sets that conflict with the forced or suppressed faults; these sets are considered to be safe.
// If no sets remain, skip to the next level
sets = RemoveInvalidSets(sets, currentSafe);
if (sets.Count == 0)
{
continue;
}
// Abort if we've exceeded the maximum fault set cardinality; doing the check here allows us
// to report the analysis as complete if the maximum cardinality is never reached
if (cardinality > maxCardinality)
{
isComplete = false;
break;
}
if (cardinality == 0)
{
ConsoleHelpers.WriteLine("Checking the empty fault set...");
}
else
{
ConsoleHelpers.WriteLine($"Checking {sets.Count} sets of cardinality {cardinality}...");
}
// use heuristics
var setsToCheck = new LinkedList <FaultSet>(sets);
foreach (var heuristic in Heuristics)
{
var count = setsToCheck.Count;
heuristicWatch.Restart();
heuristic.Augment((uint)cardinality, setsToCheck);
count = setsToCheck.Count - count;
if (count > 0)
{
ConsoleHelpers.WriteLine($" {heuristic.GetType().Name} made {count} suggestions in {heuristicWatch.Elapsed.TotalMilliseconds}ms.");
}
}
// We have to check each set - heuristics may add further during the loop
while (setsToCheck.Count > 0)
{
var set = setsToCheck.First.Value;
var isCurrentLevel = sets.Remove(set); // returns true if set was actually contained
setsToCheck.RemoveFirst();
// for current level, we already know the set is valid
var isValid = isCurrentLevel || IsValid(set);
// the set is invalid if it exceeds the maximum cardinality level
isValid &= set.Cardinality <= maxCardinality;
var isSafe = true;
if (isValid)
{
isSafe = CheckSet(set, allFaults, !isCurrentLevel);
}
if (isSafe && isCurrentLevel)
{
currentSafe.Add(set);
}
// inform heuristics about result and give them the opportunity to add further sets
foreach (var heuristic in Heuristics)
{
heuristic.Update(setsToCheck, set, isSafe);
}
if (StopOnFirstException && _exceptions.Count > 0)
{
goto returnResult;
}
}
// in case heuristics removed a set (they shouldn't)
foreach (var set in sets)
{
var isSafe = CheckSet(set, allFaults, false);
if (isSafe)
{
currentSafe.Add(set);
}
if (StopOnFirstException && _exceptions.Count > 0)
{
goto returnResult;
}
}
}
returnResult:
// Reset the nondeterministic faults so as to not influence subsequent analyses
foreach (var fault in nondeterministicFaults)
{
fault.Activation = Activation.Nondeterministic;
}
// due to heuristics usage, we may have informatiuon on non-minimal critical sets
var minimalCritical = RemoveNonMinimalCriticalSets();
_results.IsComplete = isComplete;
_results.Time = stopwatch.Elapsed;
_results.SetResult(minimalCritical, _checkedSetCount, _checkedSets, _counterExamples, _exceptions);
return(_results);
}
public QualitativeChecker(CoupledExecutableModelCreator <TExecutableModel> createModel)
{
ModelCreator = createModel;
}
public static ExecutableCounterExample <TExecutableModel> ExecutableCounterExample <TExecutableModel>(this InvariantAnalysisResult result, CoupledExecutableModelCreator <TExecutableModel> modelCreator) where TExecutableModel : ExecutableModel <TExecutableModel>
{
if (result.CounterExample != null)
{
return(new ExecutableCounterExample <TExecutableModel>(modelCreator.Create(0), result.CounterExample));
}
return(null);
}
public override InvariantAnalysisResult CheckInvariant(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, Formula formula)
{
return(_modelChecker.CheckInvariant(createModel, formula));
}
public override InvariantAnalysisResult[] CheckInvariants(CoupledExecutableModelCreator <SafetySharpRuntimeModel> createModel, params Formula[] invariants)
{
throw new NotImplementedException();
}
