public IList <long> Run()
{
if (_memory == null)
{
throw new Exception($"You must load a program first using {nameof(Computer)}.{nameof(Load)}");
}
Running = true;
while (Running && _instructionPointer < _memory.Count)
{
var instruction = new Instruction(_memory[(int)_instructionPointer]);
var parameterValues = GetParameterValues(instruction);
long index;
var jmp = false;
switch (instruction.Op)
{
case OpCode.Add:
index = GetIndex(parameterValues[2]);
ExtendMemoryIfRequired(index);
_memory[(int)index] = GetValue(parameterValues[0]) + GetValue(parameterValues[1]);
break;
case OpCode.Multiply:
index = GetIndex(parameterValues[2]);
ExtendMemoryIfRequired(index);
_memory[(int)index] = GetValue(parameterValues[0]) * GetValue(parameterValues[1]);
break;
case OpCode.Save:
index = GetIndex(parameterValues[0]);
ExtendMemoryIfRequired(index);
var input = InputModule.InputCallback();
_memory[(int)index] = input;
break;
case OpCode.Output:
var outputValue = GetValue(parameterValues[0]);
OutputModule.OutputCallback(outputValue);
break;
case OpCode.JmpT:
jmp = GetValue(parameterValues[0]) > 0;
if (jmp)
{
_instructionPointer = GetValue(parameterValues[1]);
}
break;
case OpCode.JmpF:
jmp = GetValue(parameterValues[0]) == 0;
if (jmp)
{
_instructionPointer = GetValue(parameterValues[1]);
}
break;
case OpCode.LessThan:
var lt = GetValue(parameterValues[0]) < GetValue(parameterValues[1]);
index = GetIndex(parameterValues[2]);
ExtendMemoryIfRequired(index);
_memory[(int)index] = lt ? 1 : 0;;
break;
case OpCode.Eql:
var eql = GetValue(parameterValues[0]) == GetValue(parameterValues[1]);
index = GetIndex(parameterValues[2]);
ExtendMemoryIfRequired(index);
var toStore = eql ? 1 : 0;
_memory[(int)index] = toStore;
break;
case OpCode.Halt:
Halted = true;
return(_memory);
case OpCode.SetRbo:
_rbo += GetValue(parameterValues[0]);
break;
default:
throw new ArgumentOutOfRangeException();
}
if (!jmp)
{
_instructionPointer += instruction.ParameterModes.Count + 1;
}
}
return(_memory);
}
