public IEnumerable <Position> Execute(QuipuEnv qee)
{
// Empty program: exit immediately
if (qee.ThreadValues.Count == 0)
{
yield break;
}
while (true)
{
var instr = Threads[qee.CurrentThread].Knots[qee.CurrentKnot];
yield return(instr.Position);
var result = instr.Instruction(qee);
if (result != null)
{
if (result.Value == -1)
{
yield break;
}
if (result.Value < -1 || result.Value >= Threads.Length)
{
throw new InvalidOperationException(@"Jump to invalid thread {0}.".Fmt(result));
}
qee.ThreadValues[qee.CurrentThread] = qee.Stack.Pop();
qee.CurrentThread = result.Value;
qee.CurrentKnot = 0;
qee.Stack.Clear();
qee.Stack.Push(qee.ThreadValues[result.Value]);
}
else
{
qee.CurrentKnot++;
if (qee.CurrentKnot >= Threads[qee.CurrentThread].Knots.Count)
{
qee.ThreadValues[qee.CurrentThread] = qee.Stack.Pop();
qee.CurrentThread++;
if (qee.CurrentThread >= Threads.Length)
{
break;
}
qee.CurrentKnot = 0;
qee.Stack.Clear();
qee.Stack.Push(qee.ThreadValues[qee.CurrentThread]);
}
}
}
yield return(new Position(SourceLength, 0));
}
public IEnumerable<Position> Execute(QuipuEnv qee)
{
// Empty program: exit immediately
if (qee.ThreadValues.Count == 0)
yield break;
while (true)
{
var instr = Threads[qee.CurrentThread].Knots[qee.CurrentKnot];
yield return instr.Position;
var result = instr.Instruction(qee);
if (result != null)
{
if (result.Value == -1)
yield break;
if (result.Value < -1 || result.Value >= Threads.Length)
throw new InvalidOperationException(@"Jump to invalid thread {0}.".Fmt(result));
qee.ThreadValues[qee.CurrentThread] = qee.Stack.Pop();
qee.CurrentThread = result.Value;
qee.CurrentKnot = 0;
qee.Stack.Clear();
qee.Stack.Push(qee.ThreadValues[result.Value]);
}
else
{
qee.CurrentKnot++;
if (qee.CurrentKnot >= Threads[qee.CurrentThread].Knots.Count)
{
qee.ThreadValues[qee.CurrentThread] = qee.Stack.Pop();
qee.CurrentThread++;
if (qee.CurrentThread >= Threads.Length)
break;
qee.CurrentKnot = 0;
qee.Stack.Clear();
qee.Stack.Push(qee.ThreadValues[qee.CurrentThread]);
}
}
}
yield return new Position(SourceLength, 0);
}