def test_pack_unpack(self):
packed = pack_instruction(op_code=OPCODE.IFG,
a=Value.reg(REG.A),
b=Value.reg(REG.B))
op_code, b, a = unpack_instruction(packed)
self.assertEqual(op_code, OPCODE.IFG)
self.assertEqual(b, Value.reg(REG.A))
self.assertEqual(a, Value.reg(REG.B))
def dispatch(self):
""" Execute instruction at [PC] """
instruction = self.cpu.ram[self.cpu.PC.value].value
self.cpu.PC.value = self.cpu.PC.value + 1
op_code, b_val, a_val = unpack_instruction(instruction)
if op_code == 0x00:
self.non_basic(instruction)
else:
b = value_lookup(self.cpu, b_val, as_a=False)
a = value_lookup(self.cpu, a_val, as_a=True)
if not self.cpu.skip_instruction:
self.BASIC_INSTRUCTIONS[op_code](b, a)
else:
self.cpu.skip_instruction = False
