/// <summary>
/// Computes the initial states of the model, storing the computed <paramref name="transitions" />.
/// </summary>
/// <param name="transitions">The set the computed transitions should be stored in.</param>
internal void ComputeInitialStates(TransitionSet transitions)
{
_choiceResolver.PrepareNextState();
fixed(byte *state = ConstructionState)
{
while (_choiceResolver.PrepareNextPath())
{
Deserialize(state);
ExecuteInitialStep();
transitions.Add(this);
}
}
}
/// <summary>
/// Generates the replay information for the <paramref name="trace" />.
/// </summary>
/// <param name="choiceResolver">The choice resolver that should be used to resolve nondeterministic choices.</param>
/// <param name="trace">The trace the replay information should be generated for.</param>
/// <param name="endsWithException">Indicates whether the trace ends with an exception being thrown.</param>
private int[][] GenerateReplayInformation(ChoiceResolver choiceResolver, byte[][] trace, bool endsWithException)
{
var info = new int[trace.Length - 1][];
var targetState = stackalloc byte[StateVectorSize];
// We have to generate the replay info for all transitions
for (var i = 0; i < trace.Length - 1; ++i)
{
choiceResolver.Clear();
choiceResolver.PrepareNextState();
// Try all transitions until we find the one that leads to the desired state
while (true)
{
try
{
if (!choiceResolver.PrepareNextPath())
break;
fixed (byte* sourceState = trace[i])
Deserialize(sourceState);
if (i == 0)
ExecuteInitialStep();
else
ExecuteStep();
if (endsWithException && i == trace.Length - 2)
continue;
}
catch (Exception)
{
Requires.That(endsWithException, "Unexpected exception.");
Requires.That(i == trace.Length - 2, "Unexpected exception.");
info[i] = choiceResolver.GetChoices().ToArray();
break;
}
NotifyFaultActivations();
Serialize(targetState);
// Compare the target states; if they match, we've found the correct transition
var areEqual = true;
for (var j = _stateHeaderBytes; j < StateVectorSize; ++j)
areEqual &= targetState[j] == trace[i + 1][j];
if (!areEqual)
continue;
info[i] = choiceResolver.GetChoices().ToArray();
break;
}
Requires.That(info[i] != null, $"Unable to generate replay information for step {i + 1} of {trace.Length}.");
}
return info;
}
