private void Visit(SlotExpression expr, Index start = default, Index?end = null)
{
LoadMachine();
if (expr.Slot == Slots.Memory)
{
LoadMemory();
}
LoadIndex(expr, start);
// Calculate range length
if (end == null)
{
Generator.Ldc_I4(1);
}
else
{
Generator.Dup(); // Duplicate start index for GetInputs parameter
// length = -start + end
Generator.Neg();
LoadIndex(expr, end.Value);
Generator.Add();
}
if (expr.Slot == Slots.In)
{
Generator.Call(Info.OfMethod <IMachine>(nameof(IMachine.GetInputs), "System.Int32,System.Int32"));
}
else if (expr.Slot == Slots.Memory)
{
Generator.Call(Info.OfMethod <IMemory>(nameof(IMemory.Read), "System.Int32,System.Int32"));
}
else
{
throw new LogicEngineException("Invalid slot", expr);
}
ValueToReference();
}
private void LoadIndex(SlotExpression expr, Index idx)
{
if (idx.FromEnd)
{
GetSlotSize(expr);
}
if (idx.Value == null)
{
Generator.Ldc_I4(0);
}
else
{
Visit(idx.Value);
BitsValueToNumber();
Generator.Conv <int>();
}
if (idx.FromEnd)
{
Generator.Sub();
}
}