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| """
LOAD_VALUE 把值入栈
STORE_NAME 出栈赋值给变量
LOAD_NAME 把变量值入栈
"""
from dis import Instruction
what_to_execute = {
"instructions": [("LOAD_VALUE", 0),
("STORE_NAME", 0),
("LOAD_VALUE", 1),
("STORE_NAME", 1),
("LOAD_NAME", 0),
("LOAD_NAME", 1),
("ADD_TWO_VALUES", None),
("PRINT_ANSWER", None)],
"numbers": [1, 2],
"names": ["a", "b"]
}
class Interpreter:
def __init__(self):
self.stack = []
self.environment = {}
def STORE_NAME(self, name):
val = self.stack.pop()
self.environment[name] = val
def LOAD_NAME(self, name):
val = self.environment[name]
self.stack.append(val)
def LOAD_VALUE(self, number):
self.stack.append(number)
def PRINT_ANSWER(self):
answer = self.stack.pop()
print(answer)
def ADD_TWO_VALUES(self):
first_num = self.stack.pop()
second_num = self.stack.pop()
total = first_num + second_num
self.stack.append(total)
def parse_argument(self, instruction, argument, what_to_execute):
numbers = ["LOAD_VALUE"]
names = ["LOAD_NAME", "STORE_NAME"]
if instruction in numbers:
argument = what_to_execute["numbers"][argument]
elif instruction in names:
argument = what_to_execute["names"][argument]
return argument
def run_code(self, what_to_execute):
instructions = what_to_execute['instructions']
for each_step in instructions:
instruction, argument = each_step
argument = self.parse_argument(instruction, argument, what_to_execute)
if instruction == 'LOAD_VALUE':
self.LOAD_VALUE(argument)
elif instruction == 'ADD_TWO_VALUES':
self.ADD_TWO_VALUES()
elif instruction == 'PRINT_ANSWER':
self.PRINT_ANSWER()
elif instruction == 'STORE_NAME':
self.STORE_NAME(argument)
elif instruction == "LOAD_NAME":
self.LOAD_NAME(argument)
def execute(self, what_to_execute):
instructions = what_to_execute["instructions"]
for each_step in instructions:
instruction, argument = each_step
argument = self.parse_argument(instruction, argument, what_to_execute)
bytecode_method = getattr(self, instruction)
if argument is None:
bytecode_method()
else:
bytecode_method(argument)
interpreter = Interpreter()
interpreter.run_code(what_to_execute)
interpreter.execute(what_to_execute)
|
