/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="createModel">Creates the model that should be checked.</param>
/// <param name="output">The callback that should be used to output messages.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
internal ModelTraverser(AnalysisModelCreator createModel, AnalysisConfiguration configuration, int transitionSize, bool createStutteringState)
{
Requires.NotNull(createModel, nameof(createModel));
var stopwatch = new Stopwatch();
stopwatch.Start();
TransitionCollection.ValidateTransitionSizes();
var tasks = new Task[configuration.CpuCount];
var stacks = new StateStack[configuration.CpuCount];
_loadBalancer = new LoadBalancer(stacks);
Context = new TraversalContext(_loadBalancer, configuration);
_workers = new Worker[configuration.CpuCount];
for (var i = 0; i < configuration.CpuCount; ++i)
{
var index = i;
tasks[i] = Task.Factory.StartNew(() =>
{
stacks[index] = new StateStack(configuration.StackCapacity);
_workers[index] = new Worker(index, Context, stacks[index], createModel.Create());
});
}
Task.WaitAll(tasks);
var firstModel = _workers[0].Model;
if (transitionSize == DeriveTransitionSizeFromModel)
{
transitionSize = firstModel.TransitionSize;
}
if (configuration.WriteStateVectorLayout)
{
firstModel.WriteStateVectorLayout(configuration.DefaultTraceOutput);
}
var modelCapacity = configuration.ModelCapacity.DeriveModelByteSize(firstModel.ModelStateVectorSize, transitionSize);
Context.ModelCapacity = modelCapacity;
if (configuration.UseCompactStateStorage)
{
_states = new CompactStateStorage(modelCapacity.SizeOfState, modelCapacity.NumberOfStates);
}
else
{
_states = new SparseStateStorage(modelCapacity.SizeOfState, modelCapacity.NumberOfStates);
}
Context.States = _states;
if (createStutteringState)
{
Context.StutteringStateIndex = _states.ReserveStateIndex();
}
_initializationTime = stopwatch.Elapsed;
stopwatch.Stop();
}
/// <summary>
/// Optionally modifies the <paramref name="transitions" />, changing any of their values. However, no new transitions can be
/// added; transitions can be removed by setting their <see cref="CandidateTransition.IsValid" /> flag to <c>false</c>.
/// During subsequent traversal steps, only valid transitions and target states reached by at least one valid transition
/// are considered.
/// </summary>
/// <param name="context">The context of the model traversal.</param>
/// <param name="worker">The worker that found the transition.</param>
/// <param name="transitions">The transitions that should be checked.</param>
/// <param name="sourceState">The source state of the transitions.</param>
/// <param name="sourceStateIndex">The unique index of the transition's source state.</param>
/// <param name="isInitial">Indicates whether the transitions are initial transitions not starting in any valid source state.</param>
public void ModifyTransitions(TraversalContext context, Worker worker, TransitionCollection transitions, byte *sourceState, int sourceStateIndex, bool isInitial)
{
foreach (CandidateTransition *transition in transitions)
{
if (TransitionFlags.IsValid(transition->Flags) && _terminateEarlyCondition(transition->Formulas))
{
transition->Flags = TransitionFlags.SetToStutteringStateFlag(transition->Flags);
}
}
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="index">The zero-based index of the worker.</param>
/// <param name="context">The context the model is traversed in.</param>
/// <param name="stateStack">The state stack that should be used by the worker.</param>
/// <param name="model">The model that the worker should analyze.</param>
public Worker(int index, TraversalContext <TExecutableModel> context, StateStack stateStack, AnalysisModel <TExecutableModel> model)
{
Requires.NotNull(context, nameof(context));
Requires.NotNull(stateStack, nameof(stateStack));
Requires.NotNull(model, nameof(model));
_index = index;
_context = context;
_stateStack = stateStack;
Model = model;
}
/// <summary>
/// Initializes a new instance.
/// </summary>
/// <param name="createModel">Creates the model that should be checked.</param>
/// <param name="output">The callback that should be used to output messages.</param>
/// <param name="configuration">The analysis configuration that should be used.</param>
internal ModelTraverser(AnalysisModelCreator <TExecutableModel> createModel, Action <string> output, AnalysisConfiguration configuration, int transitionSize)
{
Requires.NotNull(createModel, nameof(createModel));
Requires.NotNull(output, nameof(output));
var stopwatch = new Stopwatch();
stopwatch.Start();
TransitionCollection.ValidateTransitionSizes();
var tasks = new Task[configuration.CpuCount];
var stacks = new StateStack[configuration.CpuCount];
_loadBalancer = new LoadBalancer(stacks);
Context = new TraversalContext <TExecutableModel>(_loadBalancer, configuration, output);
_workers = new Worker <TExecutableModel> [configuration.CpuCount];
for (var i = 0; i < configuration.CpuCount; ++i)
{
var index = i;
tasks[i] = Task.Factory.StartNew(() =>
{
stacks[index] = new StateStack(configuration.StackCapacity);
_workers[index] = new Worker <TExecutableModel>(index, Context, stacks[index], createModel.Create());
});
}
Task.WaitAll(tasks);
var firstModel = _workers[0].Model;
if (transitionSize == DeriveTransitionSizeFromModel)
{
transitionSize = firstModel.TransitionSize;
}
var modelCapacity = configuration.ModelCapacity.DeriveModelByteSize(firstModel.StateVectorSize, transitionSize);
Context.ModelCapacity = modelCapacity;
_states = new StateStorage(modelCapacity.SizeOfState, modelCapacity.NumberOfStates);
Context.States = _states;
Context.StutteringStateIndex = _states.ReserveStateIndex();
_initializationTime = stopwatch.Elapsed;
stopwatch.Stop();
}
