Brainfuck反汇编(Pythone)

Posted 2020-09-26

global cs
global ip

global ss
#global sp

global ds
global bp

global tab
global out
#cs=‘++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.‘
ip = 0

ss = []
#sp = 0

ds = []
bp = 0

tab = 0
out = []

def tab_():
    i = tab
    stab = ‘‘
    while i > 0:
        stab += ‘\t‘
        i -= 1
    return stab

def push(var):
    global ss
    ss.append(var)

def pop():
    global ss
    return ss.pop()

def op_inc_val():
    global ip
    count = 0
    while True:
        op = cs[ip]            
        ip = ip + 1
        if op == ‘+‘:
            count = count + 1
        else:
            break
    print tab_()+‘ds[%d] += %d‘%(bp, count)

def op_dec_val():
    global ip    
    count = 0
    while True:
        op = cs[ip]            
        ip = ip + 1
        if op == ‘-‘:
            count = count + 1
        else:
            break
    print tab_()+‘ds[%d] -= %d‘%(bp, count)

def op_inc_dp():
    global bp
    bp = bp + 1

def op_dec_dp():
    global bp
    bp = bp - 1

def op_jmp_fwd():
    global tab
    print tab_()+‘while ds[%d]:‘%(bp)
    tab = tab + 1

def op_jmp_bck():
    global tab
    tab = tab - 1

def op_out():
    print tab_()+‘putchar(ds[%d])‘%(bp)

def op_in():
    print tab_()+‘getchar‘

end = len(cs)
while ip < end:
    op = cs[ip]
    ip = ip + 1
    if op == ‘+‘:
        ip = ip - 1
        op_inc_val()
        ip = ip - 1
    elif op == ‘-‘:
        ip = ip - 1
        op_dec_val()
        ip = ip - 1
    elif op == ‘>‘:
        op_inc_dp()
    elif op == ‘<‘:
        op_dec_dp()
    elif op == ‘[‘:
        op_jmp_fwd()
    elif op == ‘]‘:
        op_jmp_bck()
    elif op == ‘.‘:
        op_out()
    elif op == ‘,‘:
        op_in()
    else:
        print ‘invalid opcode‘
        break