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import dis
import array
import collections
from setuptools.extern import six
OpArg = collections.namedtuple('OpArg', 'opcode arg')
class Bytecode_compat(object):
def __init__(self, code):
self.code = code
def __iter__(self):
"""Yield '(op,arg)' pair for each operation in code object 'code'"""
bytes = array.array('b', self.code.co_code)
eof = len(self.code.co_code)
ptr = 0
extended_arg = 0
while ptr < eof:
op = bytes[ptr]
if op >= dis.HAVE_ARGUMENT:
arg = bytes[ptr + 1] + bytes[ptr + 2] * 256 + extended_arg
ptr += 3
if op == dis.EXTENDED_ARG:
long_type = six.integer_types[-1]
extended_arg = arg * long_type(65536)
continue
else:
arg = None
ptr += 1
yield OpArg(op, arg)
Bytecode = getattr(dis, 'Bytecode', Bytecode_compat)
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