Last active
December 5, 2019 19:29
-
-
Save nordicdyno/1c004e66e1353f7bb6dd53184b826d23 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from typing import List, Dict, Callable | |
from dataclasses import dataclass, field | |
import functools | |
# parameter modes: | |
p_mod = 0 # position mode | |
i_mod = 1 # immediate mode | |
# returns opcode & mode flags coded in instruction | |
def parse_instruction(opcode: int) -> (int, List[int]): | |
param_modes = str(opcode)[:-2] or [] | |
opcode = int(str(opcode)[-2:]) | |
return opcode, [int(c) for c in reversed(param_modes)] | |
@dataclass | |
class Context(): | |
memory: List[int] | |
IP: int = 0 | |
input: int = None | |
@dataclass | |
class OpCode(): | |
op: Callable | |
args_count: int = 0 | |
def call(self, ctx: Context, parameter_modes: List[int]) -> int: | |
op_args = _read_args(ctx, self.args_count, parameter_modes) | |
return self.op(ctx, op_args) | |
def _read_args(ctx: Context, args_count: int, p_modes: List[int]) -> List[int]: | |
values = [] | |
for i in range(args_count): | |
v = ctx.memory[ctx.IP+i+1] | |
# default mode is the "position mode" | |
if (i >= len(p_modes)) or (p_modes[i] == p_mod): | |
v = ctx.memory[v] | |
values.append(v) | |
return values | |
def op_add(ctx: Context, op_args: List[int]) -> int: | |
ip, mem = ctx.IP, ctx.memory | |
mem[mem[ip+3]] = functools.reduce(lambda a,b : a+b, op_args) | |
return ctx.IP+4 | |
def op_mul(ctx: Context, op_args: List[int]) -> int: | |
ip, mem = ctx.IP, ctx.memory | |
mem[mem[ip+3]] = functools.reduce(lambda a,b : a*b, op_args) | |
return ctx.IP+4 | |
def op_input(ctx: Context, op_args: List[int]) -> int: | |
ip, mem = ctx.IP, ctx.memory | |
mem[mem[ip+1]] = ctx.input | |
return ctx.IP+2 | |
def op_output(ctx: Context, op_args: List[int]) -> int: | |
ip, mem = ctx.IP, ctx.memory | |
print(mem[mem[ip+1]]) | |
return ctx.IP+2 | |
def op_jmp_if_true(ctx: Context, op_args: List[int]) -> int: | |
if op_args[0]: | |
return op_args[1] | |
return ctx.IP+3 | |
def op_jmp_if_false(ctx: Context, op_args: List[int]) -> int: | |
if op_args[0] == 0: | |
return op_args[1] | |
return ctx.IP+3 | |
def op_less_than(ctx: Context, op_args: List[int]) -> int: | |
ip, mem = ctx.IP, ctx.memory | |
value = 1 if op_args[0] < op_args[1] else 0 | |
mem[mem[ip+3]] = value | |
return ctx.IP+4 | |
def op_equals(ctx: Context, op_args: List[int]) -> int: | |
ip, mem = ctx.IP, ctx.memory | |
value = 1 if op_args[0] == op_args[1] else 0 | |
mem[mem[ip+3]] = value | |
return ctx.IP+4 | |
opcodes = { | |
1: OpCode(op_add, 2), | |
2: OpCode(op_mul, 2), | |
3: OpCode(op_input), | |
4: OpCode(op_output), | |
5: OpCode(op_jmp_if_true, 2), | |
6: OpCode(op_jmp_if_false, 2), | |
7: OpCode(op_less_than, 2), | |
8: OpCode(op_equals, 2), | |
99: OpCode(None), | |
} | |
@dataclass | |
class CPU(): | |
memory: List[int] | |
input: int = None | |
max_steps: int = 500 | |
# execute state | |
step: int = field(default=0, init=False) | |
last_opcode: int = field(default=None, init=False) | |
ctx: Context = field(init=False) | |
def __post_init__(self): | |
self.ctx = Context(memory=self.memory, input=self.input) | |
def __iter__(self): | |
return self | |
def __next__(self): | |
state = self.state() | |
if self.ctx.IP > len(self.ctx.memory): | |
raise StopIteration | |
opcode, raw_modes = parse_instruction(self.ctx.memory[self.ctx.IP]) | |
self.last_opcode = opcode | |
if opcode == 99: | |
raise StopIteration | |
self.ctx.IP = opcodes[opcode].call(self.ctx, raw_modes) | |
self.step += 1 | |
return state | |
def state(self) -> Dict: | |
return { | |
"step": self.step, | |
"IP": self.ctx.IP, | |
"last_opcode": self.last_opcode, | |
} | |
def execute(self): | |
for i, _ in enumerate(self): | |
if i > self.max_steps: | |
raise("Too many steps. Probably program error") | |
# solution1 | |
#cpu1 = intcode.CPU(memory=program, input=1) | |
#cpu1.execute() | |
# solution1 | |
#cpu2 = intcode.CPU(memory=program, input=5) | |
#cpu2.execute() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment