public void Step()
{
_recoveryFlag = false;
_haltFlag = false;
if (InstructionPointer < 0 || InstructionPointer >= _program.Count)
{
_haltFlag = true;
return;
}
var instruction = _program[(int)InstructionPointer];
var disasseblyA = "";
long valueA = 0;
if (instruction.ValueA.HasValue)
{
valueA = instruction.ValueA.Value;
disasseblyA = valueA.ToString();
}
if (instruction.RegisterA.HasValue)
{
valueA = GetRegister(instruction.RegisterA.Value);
disasseblyA = instruction.RegisterA.Value.ToString();
}
var disasseblyB = "";
long valueB = 0;
if (instruction.ValueB.HasValue)
{
valueB = instruction.ValueB.Value;
disasseblyB = valueB.ToString();
}
if (instruction.RegisterB.HasValue)
{
valueB = GetRegister(instruction.RegisterB.Value);
disasseblyB = instruction.RegisterB.Value.ToString();
}
if (Disassembly)
{
Console.WriteLine(InstructionPointer + ": " + _opcodesLookup.Single(i => i.Value == instruction.Opcode).Key + " " + disasseblyA + " " + disasseblyB);
}
switch (instruction.Opcode)
{
case Opcode.Snd:
SendCount++;
_recoveryFrequency = valueA;
Send.Add(_recoveryFrequency);
//Console.WriteLine($"sound: {_recoveryFrequency}");
break;
case Opcode.Set:
SetRegister(instruction.RegisterA.Value, valueB);
break;
case Opcode.Add:
var add = valueA;
add += valueB;
SetRegister(instruction.RegisterA.Value, add);
break;
case Opcode.Sub:
var sub = valueA;
sub -= valueB;
SetRegister(instruction.RegisterA.Value, sub);
break;
case Opcode.Mul:
MulCount++;
var mul = valueA;
mul *= valueB;
SetRegister(instruction.RegisterA.Value, mul);
break;
case Opcode.Mod:
var mod = valueA;
mod %= valueB;
SetRegister(instruction.RegisterA.Value, mod);
break;
case Opcode.Rcv:
if (valueA != 0)
{
if (_recoveryFrequency > 0)
{
_recoveryFlag = true;//part 1
}
}
if (Received.Any())
{
_recoveryFlag = false;
var received = Received.First();
Received.RemoveAt(0);
SetRegister(instruction.RegisterA.Value, received);
}
else//If
{
//Return, skipping increment of instruction ptr
_recoveryFlag = true;
return;
}
break;
case Opcode.Jgz:
if (valueA > 0)
{
InstructionPointer += valueB;
}
else
{
InstructionPointer++;
}
break;
case Opcode.Jnz:
if (valueA != 0)
{
InstructionPointer += valueB;
}
else
{
InstructionPointer++;
}
break;
default:
throw new Exception();
}
if (instruction.Opcode != Opcode.Jgz && instruction.Opcode != Opcode.Jnz)
{
InstructionPointer++;
}
StepCount++;
}