Created
April 17, 2020 13:28
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A simple stack machine implementation for Python in Python
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| import dis | |
| # Run this with python3 : ) | |
| class VM: | |
| def __init__(self): | |
| self.stack = [] | |
| def push(self, value): | |
| self.stack.append(value) | |
| def pop(self): | |
| return self.stack.pop() | |
| def call(self, function, args): | |
| bytecode = dis.Bytecode(function) | |
| constants = function.__code__.co_consts | |
| local_vars = args + ( | |
| (function.__code__.co_nlocals - len(args)) * [None] | |
| ) | |
| global_vars = globals() | |
| var_names = function.__code__.co_names | |
| for instruction in bytecode: | |
| if instruction.opname == "LOAD_CONST": | |
| self.push(constants[instruction.arg]) | |
| elif instruction.opname == "LOAD_FAST": | |
| self.push(local_vars[instruction.arg]) | |
| elif instruction.opname == "STORE_FAST": | |
| local_vars[instruction.arg] = self.pop() | |
| elif instruction.opname == "LOAD_GLOBAL": | |
| self.push(global_vars[var_names[instruction.arg]]) | |
| elif instruction.opname == "CALL_FUNCTION": | |
| args = [self.pop() for arg in range(instruction.arg)] | |
| func_to_call = self.pop() | |
| self.call(func_to_call, args) | |
| elif instruction.opname == "BINARY_ADD": | |
| addition = self.pop() + self.pop() | |
| self.push(addition) | |
| elif instruction.opname == "RETURN_VALUE": | |
| return | |
| def func(a, b): | |
| return a + b | |
| glob = 10 | |
| def hede(a): | |
| b = 4 | |
| total = (a + glob + b + 1) | |
| return func(total, 2) | |
| vm = VM() | |
| vm.call(hede, [1]) | |
| result = vm.pop() | |
| print(result) |
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