pyvm2.py 文件源码

def parse_byte_and_args(self):
        """ Parse 1 - 3 bytes of bytecode into
        an instruction and optionally arguments."""
        f = self.frame
        opoffset = f.f_lasti
        byteCode = ord(f.f_code.co_code[opoffset])
        f.f_lasti += 1
        byteName = dis.opname[byteCode]
        arg = None
        arguments = []
        if byteCode >= dis.HAVE_ARGUMENT:
            arg = f.f_code.co_code[f.f_lasti:f.f_lasti+2]
            f.f_lasti += 2
            intArg = ord(arg[0]) + (ord(arg[1]) << 8)
            if byteCode in dis.hasconst:
                arg = f.f_code.co_consts[intArg]
            elif byteCode in dis.hasfree:
                if intArg < len(f.f_code.co_cellvars):
                    arg = f.f_code.co_cellvars[intArg]
                else:
                    var_idx = intArg - len(f.f_code.co_cellvars)
                    arg = f.f_code.co_freevars[var_idx]
            elif byteCode in dis.hasname:
                arg = f.f_code.co_names[intArg]
            elif byteCode in dis.hasjrel:
                arg = f.f_lasti + intArg
            elif byteCode in dis.hasjabs:
                arg = intArg
            elif byteCode in dis.haslocal:
                arg = f.f_code.co_varnames[intArg]
            else:
                arg = intArg
            arguments = [arg]

        return byteName, arguments, opoffset