def test_double_component_subtract_from_contents():
H = Component("H")
L = Component("L")
HL = DoubleComponent("HL", L, H)
H.set_contents(0)
L.set_contents(1)
carry_flag = HL.subtract_from_contents(1)
assert HL.get_contents() == 0
assert carry_flag == 0
HL.set_contents_value(1000)
carry_flag = HL.subtract_from_contents(1000)
assert HL.get_contents() == 0
assert carry_flag == 0
HL.set_contents_value(1001)
carry_flag = HL.subtract_from_contents(2)
assert HL.get_contents() == 999
assert carry_flag == 0
HL.set_contents_value(1)
carry_flag = HL.subtract_from_contents(2)
assert HL.get_contents() == 65535
assert carry_flag == 1
def test_double_components_set_contents():
H = Component("H")
L = Component("L")
HL = DoubleComponent("HL", L, H)
H.set_contents(0)
L.set_contents(0)
HL.set_contents(1, 0)
assert HL.get_contents() == 1
HL.set_contents(1, 1)
assert HL.get_contents() == 257
assert L.get_contents() == 1
assert H.get_contents() == 1
def test_double_components_set_contents_value():
H = Component("H")
L = Component("L")
HL = DoubleComponent("HL", L, H)
H.set_contents(0)
L.set_contents(0)
HL.set_contents_value(1)
assert HL.get_contents() == 1
HL.set_contents_value(1000)
assert HL.get_contents() == 1000
HL.set_contents_value(0)
assert HL.get_contents() == 0
def test_double_component_get_contents():
H = Component("H")
L = Component("L")
HL = DoubleComponent("HL", L, H)
H.set_contents(0)
L.set_contents(0)
assert HL.get_contents() == 0
H.set_contents(0)
L.set_contents(1)
assert HL.get_contents() == 1
H.set_contents(1)
L.set_contents(1)
assert HL.get_contents() == 257
def test_double_component_add_to_contents():
H = Component("H")
L = Component("L")
HL = DoubleComponent("HL", L, H)
H.set_contents(0)
L.set_contents(0)
carry_flag = HL.add_to_contents(1)
assert HL.get_contents() == 1
assert carry_flag == 0
carry_flag = HL.add_to_contents(1000)
assert HL.get_contents() == 1001
assert carry_flag == 0
carry_flag = HL.add_to_contents(100000)
assert HL.get_contents() == 35465
assert carry_flag == 1
class CPUTest(InstructionBase):
MEMORY_SIZE = 256
PROGRAM_COUNTER = "P"
STACK_POINTER = "S"
def __init__(self):
self.memory = Memory(self.MEMORY_SIZE)
self.program_counter_low = Component("PL")
self.program_counter_high = Component("PH")
self.program_counter = DoubleComponent("P", self.program_counter_low,
self.program_counter_high)
self.stack_pointer = Component(self.STACK_POINTER)
self.stack_pointer.set_contents(self.MEMORY_SIZE - 1)
self.registers = self._define_registers()
self.registers_by_name = {reg.name: reg for reg in self.registers}
self.instructions = self._define_instructions()
self.instructions_by_opcode = {
ins.opcode: ins
for ins in self.instructions
}
self.instructions_by_name = {
ins.name: ins
for ins in self.instructions
}
def _define_registers(self):
registers = []
self.A = Component("A")
self.B = Component("B")
self.D = Component("D")
self.C = Component("C")
self.R = Component("R")
self.H = Component("H")
self.L = Component("L")
self.HL = DoubleComponent("HL", self.L, self.H)
registers = [
self.A,
self.B,
self.D,
self.C,
self.R,
self.program_counter,
self.stack_pointer,
self.H,
self.L,
self.HL,
]
return registers
def _define_instructions(self):
instructions = [
LDRV("LDAV", 1, self.memory, self.program_counter, [self.A]),
LDRV("LDBV", 2, self.memory, self.program_counter, [self.B]),
LDRR("LDAB", 3, self.memory, self.program_counter,
[self.A, self.B]),
LDRR("LDBA", 4, self.memory, self.program_counter,
[self.B, self.A]),
LDRM("LDAM", 5, self.memory, self.program_counter, [self.A]),
LDRM("LDBM", 6, self.memory, self.program_counter, [self.B]),
LDMR("LDMA", 7, self.memory, self.program_counter, [self.A]),
LDMR("LDMB", 8, self.memory, self.program_counter, [self.B]),
GTRR("GTAB", 9, self.memory, self.program_counter,
[self.A, self.B, self.R]),
GTRR("GTBA", 10, self.memory, self.program_counter,
[self.B, self.A, self.R]),
JMPV("JMPV", 11, self.memory, self.program_counter),
JMPV("JMPRV", 12, self.memory, self.program_counter, [self.R]),
INCR("INCA", 13, self.memory, self.program_counter,
[self.A, self.C]),
INCR("INCB", 14, self.memory, self.program_counter,
[self.B, self.C]),
ADDRR("ADDAB", 15, self.memory, self.program_counter,
[self.A, self.B, self.C]),
ADDRR("ADDBA", 16, self.memory, self.program_counter,
[self.B, self.A, self.C]),
DECR("DECB", 170, self.memory, self.program_counter,
[self.B, self.C]),
SUBRR("SUBAB", 18, self.memory, self.program_counter,
[self.A, self.B, self.C]),
SUBRR("SUBBA", 19, self.memory, self.program_counter,
[self.B, self.A, self.C]),
LTRR("LTAB", 20, self.memory, self.program_counter,
[self.A, self.B, self.R]),
LTRR("LTBA", 21, self.memory, self.program_counter,
[self.B, self.A, self.R]),
EQRR("EQAB", 22, self.memory, self.program_counter,
[self.A, self.B, self.R]),
EQRR("EQBA", 23, self.memory, self.program_counter,
[self.B, self.A, self.R]),
JMNV("JMNRV", 24, self.memory, self.program_counter, [self.R]),
JMPV("JMPCV", 25, self.memory, self.program_counter, [self.C]),
JMNV("JMNCV", 26, self.memory, self.program_counter, [self.C]),
LDIMRV("LDIMAV", 27, self.memory, self.program_counter, [self.A]),
LDIMRV("LDIMBV", 28, self.memory, self.program_counter, [self.B]),
LDIMRR("LDIMAB", 29, self.memory, self.program_counter,
[self.A, self.B]),
LDIMRR("LDIMBA", 30, self.memory, self.program_counter,
[self.B, self.A]),
LDRV("LDDV", 31, self.memory, self.program_counter, [self.D]),
LDRR("LDDA", 32, self.memory, self.program_counter,
[self.D, self.A]),
LDRR("LDDB", 33, self.memory, self.program_counter,
[self.D, self.B]),
LDIMRV("LDIMDV", 34, self.memory, self.program_counter, [self.D]),
LDIMRR("LDIMDA", 35, self.memory, self.program_counter,
[self.D, self.A]),
LDIMRR("LDIMDB", 36, self.memory, self.program_counter,
[self.D, self.B]),
INCR("INCD", 37, self.memory, self.program_counter,
[self.D, self.C]),
DECR("DECD", 38, self.memory, self.program_counter,
[self.D, self.C]),
ADDRR("ADDDA", 39, self.memory, self.program_counter,
[self.D, self.A, self.C]),
ADDRR("ADDDB", 40, self.memory, self.program_counter,
[self.D, self.B, self.C]),
GTRR("GTDB", 41, self.memory, self.program_counter,
[self.D, self.B, self.R]),
LDIRRM("LDIADM", 42, self.memory, self.program_counter,
[self.A, self.D]),
LDIRRM("LDIBDM", 43, self.memory, self.program_counter,
[self.B, self.D]),
PUSHR("PUSHA", 44, self.memory, self.stack_pointer, [self.A]),
PUSHR("PUSHB", 45, self.memory, self.stack_pointer, [self.B]),
PUSHR("PUSHD", 46, self.memory, self.stack_pointer, [self.D]),
POPR("POPA", 47, self.memory, self.stack_pointer, [self.A]),
POPR("POPB", 48, self.memory, self.stack_pointer, [self.B]),
POPR("POPD", 49, self.memory, self.stack_pointer, [self.D]),
GTRR("GTAD", 50, self.memory, self.program_counter,
[self.A, self.D, self.R]),
GTRR("GTBD", 51, self.memory, self.program_counter,
[self.B, self.D, self.R]),
JMPR("JMPA", 52, self.memory, self.program_counter, [self.A]),
JMPR("JMRA", 53, self.memory, self.program_counter,
[self.A, self.R]),
PUSHR("PUSHP", 54, self.memory, self.stack_pointer,
[self.program_counter]),
LDRM("LDDM", 55, self.memory, self.program_counter, [self.D]),
JMPR("JMPB", 56, self.memory, self.program_counter, [self.B]),
DECR("DECA", 57, self.memory, self.program_counter,
[self.A, self.C]),
CALLV("CALLV", 58, self.memory, self.program_counter, None,
self.stack_pointer),
CALLV("CALRV", 59, self.memory, self.program_counter, [self.R],
self.stack_pointer),
CALLV("CALCV", 60, self.memory, self.program_counter, [self.C],
self.stack_pointer),
RET("RET", 61, self.memory, self.program_counter, None,
self.stack_pointer),
RET("RETR", 62, self.memory, self.program_counter, [self.R],
self.stack_pointer),
RET("RETC", 63, self.memory, self.program_counter, [self.C],
self.stack_pointer),
CALNV("CANRV", 64, self.memory, self.program_counter, [self.R],
self.stack_pointer),
CALNV("CANCV", 65, self.memory, self.program_counter, [self.C],
self.stack_pointer),
RETN("RETNR", 66, self.memory, self.program_counter, [self.R],
self.stack_pointer),
RETN("RETNC", 67, self.memory, self.program_counter, [self.C],
self.stack_pointer),
LDMR("LDMD", 68, self.memory, self.program_counter, [self.D]),
ADDRR("ADDHLA", 69, self.memory, self.program_counter,
[self.HL, self.B, self.C]),
INCR("INCHL", 70, self.memory, self.program_counter,
[self.HL, self.C]),
DECR("DECHL", 71, self.memory, self.program_counter,
[self.HL, self.C]),
]
return instructions
def _decimal_to_hex(self, decimal_int):
return hex(decimal_int)[2:]
def _hex_to_decimal(self, hex_str):
return int(hex_str, 16)
def _load_file_to_list(self, filename):
row_list = []
with open(filename, 'r') as f:
row_list = [r.strip('\n') for r in f.readlines()]
return row_list
def run(self, debug=False):
instruction_count = 0
old_state, new_state = {}, {}
print("Starting CPU execution at {}".format(
self.program_counter.get_contents()))
if debug:
old_state = self.copy_current_state_values_into_dict()
opcode = self.get_memory_location_contents_and_inc_pc()
while opcode != 0:
self.instructions_by_opcode[opcode].run()
instruction_count += 1
if debug:
new_state = self.copy_current_state_values_into_dict()
changes = self.compare_state_copies(old_state, new_state)
if self.PROGRAM_COUNTER in changes:
pc_changes = changes[self.PROGRAM_COUNTER]
if pc_changes[1] - pc_changes[
0] == self.instructions_by_opcode[opcode].LENGTH:
changes.pop(self.PROGRAM_COUNTER, None)
print(self.instructions_by_opcode[opcode].name, changes)
old_state = new_state
opcode = self.get_memory_location_contents_and_inc_pc()
print("Ending CPU execution at {}, instruction count {}".format(
self.program_counter.get_contents(), instruction_count))
def disassemble(self):
disassembly = []
address = 0
while address < self.MEMORY_SIZE:
contents = self.memory.get_contents_value(address)
current_row = [address, contents]
if contents in self.instructions_by_opcode:
instruction = self.instructions_by_opcode[contents]
current_row.append(instruction.name)
number_of_args = instruction.LENGTH - 1
for _ in range(number_of_args):
address += 1
current_row.append(self.memory.get_contents_value(address))
disassembly.append(current_row)
address += 1
return disassembly
def disassemble_to_file(self, filename="cpu.csv"):
disassembly = self.disassemble()
with open(filename, "w", newline="") as f:
writer = csv.writer(f)
writer.writerows(disassembly)
def simple_assembler(self, filename):
variable_dict = {}
line_count = 0
row_list = self._load_file_to_list(filename)
contents_list = []
for row in row_list:
row = row.replace(' ', '')
symbols = row.split(',')
if ';' in symbols[0]:
continue
if '=' in symbols[0]:
variable_value = symbols[0].split('=')
variable_dict[variable_value[0]] = int(variable_value[1])
continue
if ':' in symbols[0]:
variable_dict[symbols[0][:-1]] = line_count
continue
if symbols[0] in self.instructions_by_name:
instruction = self.instructions_by_name[symbols[0]]
if len(symbols) != instruction.LENGTH:
raise ('{} length is {} but symbols are {}'.format(
instruction.name, instruction.LENGTH, symbols))
symbols[0] = instruction.opcode
line_count += instruction.LENGTH
for row in row_list:
row = row.replace(' ', '')
symbols = row.split(',')
if ';' in symbols[0]:
continue
if '=' in symbols[0]:
continue
if ':' in symbols[0]:
continue
if symbols[0] in self.instructions_by_name:
instruction = self.instructions_by_name[symbols[0]]
symbols[0] = instruction.opcode
for symbol in symbols:
if symbol in variable_dict:
symbol = variable_dict[symbol]
contents_list.append(int(symbol))
self.memory.load(contents_list)
def get_all_registers_contents(self):
return {r.name: r.get_contents() for r in self.registers}
def copy_current_state_values_into_dict(self):
state_copy = self.get_all_registers_contents()
for i, contents in enumerate(self.memory.dump()):
state_copy[i] = contents
return state_copy
def compare_state_copies(self, old, new):
changes = {}
for component in old:
if old[component] != new[component]:
changes[component] = (old[component], new[component])
return changes