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main2.py
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from collections import namedtuple
OpEntry = namedtuple("OpEntry", "decode func name type")
def rm_letters(string):
""" Remove Letters from a string """
result = ''.join(i for i in string if not i.isalpha())
return result
class Cpu:
def __init__(self):
self.stack = [0]*16
self.sp = 0
self.pc = 0
self.v = [0]*16
self.i = 0
self.dt = 0
self.st = 0
self.mem = [0]*256
self.op = Opcode(self)
def execute(self, inst, val):
print(inst.name)
self.pc += inst.func(val)
def step(self, num):
print('{:016b}'.format(self.mem[self.pc]))
inst, val = self.op.fetch('{:016b}'.format(self.mem[self.pc]))
self.execute(inst, val)
print("PC : {}".format(self.pc))
class Opcode:
def __init__(self, cpu):
self.cpu = cpu
self.op_lookup = [
OpEntry("0000000011100000", self.op_cls, "CLS", 0),
OpEntry("0000000011101110", self.op_ret, "RET", 1),
OpEntry("0000nnnnnnnnnnnn", self.op_sys, "SYS", 2),
OpEntry("0001nnnnnnnnnnnn", lambda x: self.op_jp(0, x), "JP", 2),
OpEntry("0010nnnnnnnnnnnn", self.op_call, "CALL", 2),
OpEntry("0011xxxxkkkkkkkk", lambda x: self.op_se(0, x), "SE", 3),
OpEntry("0100xxxxkkkkkkkk", lambda x: self.op_sne(0, x), "SNE", 3),
OpEntry("0101xxxxyyyy0000", lambda x: self.op_se(1, x), "SE", 4),
OpEntry("0110xxxxkkkkkkkk", lambda x: self.op_ld(0, x), "LD", 3),
OpEntry("0111xxxxkkkkkkkk", lambda x: self.op_add(0, x), "ADD", 3),
OpEntry("1000xxxxyyyy0000", lambda x: self.op_ld(1, x), "LD", 4),
OpEntry("1000xxxxyyyy0001", self.op_or, "OR", 4),
OpEntry("1000xxxxyyyy0010", self.op_and, "AND", 4),
OpEntry("1000xxxxyyyy0011", self.op_xor, "XOR", 4),
OpEntry("1000xxxxyyyy0100", lambda x: self.op_add(1, x), "ADD", 4),
OpEntry("1000xxxxyyyy0101", self.op_sub, "SUB", 4),
OpEntry("1000xxxxyyyy0110", self.op_shr, "SHR", 4),
OpEntry("1000xxxxyyyy0111", self.op_subn, "SUBN", 4),
OpEntry("1000xxxxyyyy1110", self.op_shl, "SHL", 4),
OpEntry("1001xxxxyyyy0000", lambda x: self.op_sne(1, x), "SNE", 4),
OpEntry("1010nnnnnnnnnnnn", lambda x: self.op_ld(2, x), "LD", 2),
OpEntry("1011nnnnnnnnnnnn", lambda x: self.op_jp(1, x), "JP", 2),
OpEntry("1100xxxxkkkkkkkk", self.op_rnd, "RND", 3),
OpEntry("1101xxxxyyyynnnn", self.op_drw, "DRW", 5),
OpEntry("1110xxxx10011110", self.op_skp, "SKP", 6),
OpEntry("1110xxxx10100001", self.op_sknp, "SKNP", 6),
OpEntry("1111xxxx00000111", lambda x: self.op_ld(3, x), "LD", 6),
OpEntry("1111xxxx00001010", lambda x: self.op_ld(4, x), "LD", 6),
OpEntry("1111xxxx00010101", lambda x: self.op_ld(5, x), "LD", 6),
OpEntry("1111xxxx00011000", lambda x: self.op_ld(6, x), "LD", 6),
OpEntry("1111xxxx00011110", lambda x: self.op_add(1, x), "ADD", 6),
OpEntry("1111xxxx00101001", lambda x: self.op_ld(7, x), "LD", 6),
OpEntry("1111xxxx00110011", lambda x: self.op_ld(8, x), "LD", 6),
OpEntry("1111xxxx01010101", lambda x: self.op_ld(9, x), "LD", 6),
OpEntry("1111xxxx01100101", lambda x: self.op_ld(10, x), "LD", 6)
]
self.decode_keys = [rm_letters(x.decode) for x in self.op_lookup]
def op_break(self, opcode, decode):
""" Break-up the Opcode"""
tmp_dict = {x: '' for x in set(decode) if x not in ('0', '1')}
tmp_dict['s'] = ''
for item, key in zip(opcode, decode):
if key in tmp_dict:
tmp_dict[key] += item
else:
tmp_dict['s'] += item
return tmp_dict
def fetch(self, opcode):
""" Get the items for the opcode """
tmp_decode = [self.op_break(opcode, x.decode)['s'] for x in self.op_lookup]
op_idx = [x == y for x, y in zip(tmp_decode, self.decode_keys)].index(True)
tmp_v = self.op_break(opcode, self.op_lookup[op_idx].decode)
op_v = {x: int(y, 2) for x, y in zip(tmp_v.keys(), tmp_v.values()) if x != "s"}
return self.op_lookup[op_idx], op_v
def op_cls(self, arg):
return 1
def op_ret(self, arg):
ret_v = self.cpu.stack[self.cpu.sp]
self.cpu.sp -= 1
return ret_v
def op_call(self, arg):
self.cpu.sp += 1
self.cpu.stack[self.cpu.sp] = self.cpu.pc
return arg['n']
def op_sys(self, arg):
return 1
def op_jp(self, idx, arg):
tmp = [
arg['n'],
arg['n'] + self.cpu.v[0]
]
self.cpu.pc = tmp[idx]
return 0
def op_se(self, idx, arg):
tmp = [
[1, 2][self.cpu.v[arg['x']] == arg['k']],
[1, 2][self.cpu.v[arg['x']] == self.cpu.v[arg['y']]],
]
ret_v = tmp[idx]
return ret_v
def op_sne(self, idx, arg):
tmp = [
[1, 2][self.cpu.v[arg['x']] != arg['k']],
[1, 2][self.cpu.v[arg['x']] != self.cpu.v[arg['y']]],
]
ret_v = tmp[idx]
return ret_v
def op_ld(self, idx, arg):
if idx == 0:
self.cpu.v[arg['x']] = arg['k']
elif idx == 1:
self.cpu.v[arg['x']] = self.cpu.v[arg['y']]
elif idx == 2:
self.cpu.i = arg['n']
elif idx == 3:
self.cpu.v[arg['x']] = self.cpu.dt
elif idx == 4: # Key Press
pass
elif idx == 5:
self.cpu.dt = self.cpu.v[arg['x']]
elif idx == 6:
self.cpu.st = self.cpu.v[arg['x']]
return ret_v
def op_add(self, args):
pass
def op_or(self, args):
pass
def op_and(self, args):
pass
def op_xor(self, args):
pass
def op_sub(self, args):
pass
def op_shr(self, args):
pass
def op_subn(self, args):
pass
def op_shl(self, args):
pass
def op_rnd(self, args):
pass
def op_drw(self, args):
pass
def op_skp(self, args):
pass
def op_sknp(self, args):
pass
addr_lookup = [
None,
None,
]
if __name__ == "__main__":
cpu = Cpu()
cpu.mem[0] = 0x1002
cpu.mem[1] = 0x1000
cpu.mem[2] = 0x100A
cpu.step(1)
cpu.step(1)
cpu.step(1)