Python pickle反序列化
什么是pickle
pickle是Python专用的一个进行序列化和反序列化的工具包，pickle能表示Python几乎所有的类型（包括自定义类型），由一系列opcode组成，模拟了类似堆栈的内存。
与PHP序列化或者JSON，这些以键值对形式存储序列化对象数据的不同，pickle 序列化（Python独有）是将一个 Python 对象及其所拥有的层次结构变成可以持久化储存的二进制数据，无法像JSON 一样直观阅读。在Python中，采用术语 封存 (pickling)和 解封 (unpickling)来描述序列化。
可序列化的对象
节选自官方文档：pickle — Python 对象序列化
None, True, 和False;
整数、浮点数、复数；
字符串、字节、字节数组；
元组、列表、集合和仅包含可提取对象的字典；
在模块顶层定义的函数（内置的和用户定义的）（使用def，不是lambda）；
在模块顶层定义的类；
某些类实例，这些类的__dict__属性值或__getstate__()函数的返回值可以被封存（详情参阅 封存类实例 这一段）。
手搓opcode
首先很重要的就是字节码，其实pickle经过了多次迭代已经加了很多内容了，我们直接到源码里去看看
首先是一个pickle的存储结构
self._unframer = _Unframer(self._file_read, self._file_readline)
self.read = self._unframer.read
self.readinto = self._unframer.readinto
self.readline = self._unframer.readline
self.metastack = []
//元栈
self.stack = []
//栈，默认的操作都是对这个栈进行操作
self.append = self.stack.append
self.proto = 0然后就是对各字节码的定义
# Pickle opcodes. See pickletools.py for extensive docs. The listing
# here is in kind-of alphabetical order of 1-character pickle code.
# pickletools groups them by purpose.
# Pickle的opcodes，可在pickletools.py中查看大范围的文档，在此处列出的内容是按字母顺序排列的单字符pickle code
# 在pickleltools中将这些内容按功能分组了
# 等会再去pickletools里看
# 部分偷的自己师傅的（自己人不算偷）
MARK = b'(' #向栈中压入一个Mark标记
STOP = b'.' #相当于停止当前的反序列化过程
POP = b'0' #从栈中pop出一个元素，就是删除栈顶元素
POP_MARK = b'1' #从栈中不断pop元素直到遇到Mark标记
DUP = b'2' #向栈中再压入一个当前的栈顶元素，就是复制一份当前栈顶元素然后进行压栈
FLOAT = b'F' #读取当前行到行末尾,然后转为float类型,向栈中压入一个float浮点数
INT = b'I' #向栈中压入一个int整数,整数就是当前行的最后一个字节,不过如果整数为01的时候压入的是True,为00的时候压入的是False
BININT = b'J' #从后面的输入中读取4个字节并且使用unpack通过'<i'的格式将4字节的buffer数据解包转为int类型,后面不能换行,直接家下一步的操作b"(S'a'\nK\x01\x01\x01\x01."
BININT1 = b'K' #和上面BININT一样,不过K操作只读取一个字节的数据b"(S'a'\nK\x01."
LONG = b'L' #读取当前行到行末尾,然后转为int类型,但如果后面是字符L的话会先去掉最后一个字符L再转int
BININT2 = b'M' #从后面的输入中读取2个字节并且使用unpack通过'<H'的格式将2字节的buffer作为一个2进制数解包为int,后面不能换行,直接加下一步的操作b"(S'a'\nM\x01\x01."
NONE = b'N' #向栈中压入一个None元素,后面不能换行,直接加下一步的操作b"(S'a'\nN."
PERSID = b'P' #读取当前行到行末尾,将读取到的数据作为id,通过persistent_load函数获得obj对象返回后将obj对象压栈,默认情况没用,要重写persistent_load函数才能生效
BINPERSID = b'Q' #和上面作用一样,从当前栈中弹出一个元素作为id,通过persistent_load...
REDUCE = b'R' #从当前栈中弹出两次元素,第一次是函数参数args,第二次是函数func,执行func(args)
STRING = b'S' #向栈中压入一个string字符串,内容就是后面的数据,后面的字符串第一个和最后一个必须是单引号b"(S'a'\nS''a''\n."
BINSTRING = b'T' #从后面数据读取4字节数据,通过unpack使用<i格式将数据解压后变为int类型, 然后将其作为一个长度, 后面读取这个指定长度的数据作为字符串进行压栈b"(S'a'\nT\x10\x00\x00\x000123456789abcdef."
# _struct.unpack('<i', b"\x10\x00\x00\x00") => (16,)
SHORT_BINSTRING= b'U' #先读取一个字节数据作为长度,然后按照这个长度读取字符串,读出的字符串压栈
UNICODE = b'V' #读出当前行后面的全部数据,然后进行Unicode解码,将解码内容压栈b'V\\u0061\n.'
BINUNICODE = b'X' #读出4字节数据通过unpack使用<I格式解压,将解压得到的数据作为长度,然后进行数据读取b'X\x10\x00\x00\x00abcdef0123456789.'
APPEND = b'a' #先pop出栈一个变量var1,然后获取当前栈顶元素var2,执行栈顶元素的append函数,就是将一开始的栈顶元素弹出,然后又加到下一个栈顶数组中b"]S'h0cksr'\na." => 得到['h0cksr']
BUILD = b'b' #这个操作就是设置元素属性的操作
GLOBAL = b'c' # push self.find_class(modname, name); 2 string args
DICT = b'd' # build a dict from stack items
EMPTY_DICT = b'}' # push empty dict
APPENDS = b'e' # extend list on stack by topmost stack slice
GET = b'g' # push item from memo on stack; index is string arg
BINGET = b'h' # " " " " " " ; " " 1-byte arg
INST = b'i' # build & push class instance
LONG_BINGET = b'j' # push item from memo on stack; index is 4-byte arg
LIST = b'l' # build list from topmost stack items
EMPTY_LIST = b']' # push empty list
OBJ = b'o' # build & push class instance
PUT = b'p' # store stack top in memo; index is string arg
BINPUT = b'q' # " " " " " ; " " 1-byte arg
LONG_BINPUT = b'r' # " " " " " ; " " 4-byte arg
SETITEM = b's' # add key+value pair to dict
TUPLE = b't' # build tuple from topmost stack items
EMPTY_TUPLE = b')' # push empty tuple
SETITEMS = b'u' # modify dict by adding topmost key+value pairs
BINFLOAT = b'G' # push float; arg is 8-byte float encoding
TRUE = b'I01\n' # not an opcode; see INT docs in pickletools.py
FALSE = b'I00\n' # not an opcode; see INT docs in pickletools.py
# Protocol 2
PROTO = b'\x80' # identify pickle protocol
NEWOBJ = b'\x81' # build object by applying cls.__new__ to argtuple
EXT1 = b'\x82' # push object from extension registry; 1-byte index
EXT2 = b'\x83' # ditto, but 2-byte index
EXT4 = b'\x84' # ditto, but 4-byte index
TUPLE1 = b'\x85' # build 1-tuple from stack top
TUPLE2 = b'\x86' # build 2-tuple from two topmost stack items
TUPLE3 = b'\x87' # build 3-tuple from three topmost stack items
NEWTRUE = b'\x88' # push True
NEWFALSE = b'\x89' # push False
LONG1 = b'\x8a' # push long from < 256 bytes
LONG4 = b'\x8b' # push really big long
_tuplesize2code = [EMPTY_TUPLE, TUPLE1, TUPLE2, TUPLE3]
# Protocol 3 (Python 3.x)
BINBYTES = b'B' # push bytes; counted binary string argument
SHORT_BINBYTES = b'C' # " " ; " " " " < 256 bytes
# Protocol 4
SHORT_BINUNICODE = b'\x8c' # push short string; UTF-8 length < 256 bytes
BINUNICODE8 = b'\x8d' # push very long string
BINBYTES8 = b'\x8e' # push very long bytes string
EMPTY_SET = b'\x8f' # push empty set on the stack
ADDITEMS = b'\x90' # modify set by adding topmost stack items
FROZENSET = b'\x91' # build frozenset from topmost stack items
NEWOBJ_EX = b'\x92' # like NEWOBJ but work with keyword only arguments
STACK_GLOBAL = b'\x93' # same as GLOBAL but using names on the stacks
MEMOIZE = b'\x94' # store top of the stack in memo
FRAME = b'\x95' # indicate the beginning of a new frame
# Protocol 5
BYTEARRAY8 = b'\x96' # push bytearray
NEXT_BUFFER = b'\x97' # push next out-of-band buffer
READONLY_BUFFER = b'\x98' # make top of stack readonly
上面的内容就是pickle中定义的所有字节码了，我们先略过这部分不谈，我们先来看后面的反序列化中对于不同字节码的实现来更好的理解每个字节码的注释内容
class _Unpickler:
def __init__(self, file, *, fix_imports=True,
encoding="ASCII", errors="strict", buffers=None):
self._buffers = iter(buffers) if buffers is not None else None
self._file_readline = file.readline
self._file_read = file.read
self.memo = {}
self.encoding = encoding
self.errors = errors
self.proto = 0
self.fix_imports = fix_imports
def load(self):
"""Read a pickled object representation from the open file.
Return the reconstituted object hierarchy specified in the file.
"""
# Check whether Unpickler was initialized correctly. This is
# only needed to mimic the behavior of _pickle.Unpickler.dump().
if not hasattr(self, "_file_read"):
raise UnpicklingError("Unpickler.__init__() was not called by "
"%s.__init__()" % (self.__class__.__name__,))
self._unframer = _Unframer(self._file_read, self._file_readline)
self.read = self._unframer.read
self.readinto = self._unframer.readinto
self.readline = self._unframer.readline
self.metastack = []
self.stack = []
self.append = self.stack.append
self.proto = 0
read = self.read
dispatch = self.dispatch
try:
while True:
key = read(1)
if not key:
raise EOFError
assert isinstance(key, bytes_types)
dispatch[key[0]](self)
except _Stop as stopinst:
return stopinst.value
# Return a list of items pushed in the stack after last MARK instruction.
def pop_mark(self):
items = self.stack
self.stack = self.metastack.pop()
self.append = self.stack.append
return items
def persistent_load(self, pid):
raise UnpicklingError("unsupported persistent id encountered")
dispatch = {}
def load_proto(self):
proto = self.read(1)[0]
if not 0 <= proto <= HIGHEST_PROTOCOL:
raise ValueError("unsupported pickle protocol: %d" % proto)
self.proto = proto
dispatch[PROTO[0]] = load_proto
def load_frame(self):
frame_size, = unpack('<Q', self.read(8))
if frame_size > sys.maxsize:
raise ValueError("frame size > sys.maxsize: %d" % frame_size)
self._unframer.load_frame(frame_size)
dispatch[FRAME[0]] = load_frame
def load_persid(self):
try:
pid = self.readline()[:-1].decode("ascii")
except UnicodeDecodeError:
raise UnpicklingError(
"persistent IDs in protocol 0 must be ASCII strings")
self.append(self.persistent_load(pid))
dispatch[PERSID[0]] = load_persid
def load_binpersid(self):
pid = self.stack.pop()
self.append(self.persistent_load(pid))
dispatch[BINPERSID[0]] = load_binpersid
def load_none(self):
self.append(None)
dispatch[NONE[0]] = load_none
def load_false(self):
self.append(False)
dispatch[NEWFALSE[0]] = load_false
def load_true(self):
self.append(True)
dispatch[NEWTRUE[0]] = load_true
def load_int(self):
data = self.readline()
if data == FALSE[1:]:
val = False
elif data == TRUE[1:]:
val = True
else:
val = int(data, 0)
self.append(val)
dispatch[INT[0]] = load_int
def load_binint(self):
self.append(unpack('<i', self.read(4))[0])
dispatch[BININT[0]] = load_binint
def load_binint1(self):
self.append(self.read(1)[0])
dispatch[BININT1[0]] = load_binint1
def load_binint2(self):
self.append(unpack('<H', self.read(2))[0])
dispatch[BININT2[0]] = load_binint2
def load_long(self):
val = self.readline()[:-1]
if val and val[-1] == b'L'[0]:
val = val[:-1]
self.append(int(val, 0))
dispatch[LONG[0]] = load_long
def load_long1(self):
n = self.read(1)[0]
data = self.read(n)
self.append(decode_long(data))
dispatch[LONG1[0]] = load_long1
def load_long4(self):
n, = unpack('<i', self.read(4))
if n < 0:
# Corrupt or hostile pickle -- we never write one like this
raise UnpicklingError("LONG pickle has negative byte count")
data = self.read(n)
self.append(decode_long(data))
dispatch[LONG4[0]] = load_long4
def load_float(self):
self.append(float(self.readline()[:-1]))
dispatch[FLOAT[0]] = load_float
def load_binfloat(self):
self.append(unpack('>d', self.read(8))[0])
dispatch[BINFLOAT[0]] = load_binfloat
def _decode_string(self, value):
# Used to allow strings from Python 2 to be decoded either as
# bytes or Unicode strings. This should be used only with the
# STRING, BINSTRING and SHORT_BINSTRING opcodes.
if self.encoding == "bytes":
return value
else:
return value.decode(self.encoding, self.errors)
def load_string(self):
data = self.readline()[:-1]
# Strip outermost quotes
if len(data) >= 2 and data[0] == data[-1] and data[0] in b'"\'':
data = data[1:-1]
else:
raise UnpicklingError("the STRING opcode argument must be quoted")
self.append(self._decode_string(codecs.escape_decode(data)[0]))
dispatch[STRING[0]] = load_string
def load_binstring(self):
# Deprecated BINSTRING uses signed 32-bit length
len, = unpack('<i', self.read(4))
if len < 0:
raise UnpicklingError("BINSTRING pickle has negative byte count")
data = self.read(len)
self.append(self._decode_string(data))
dispatch[BINSTRING[0]] = load_binstring
def load_binbytes(self):
len, = unpack('<I', self.read(4))
if len > maxsize:
raise UnpicklingError("BINBYTES exceeds system's maximum size "
"of %d bytes" % maxsize)
self.append(self.read(len))
dispatch[BINBYTES[0]] = load_binbytes
def load_unicode(self):
self.append(str(self.readline()[:-1], 'raw-unicode-escape'))
dispatch[UNICODE[0]] = load_unicode
def load_binunicode(self):
len, = unpack('<I', self.read(4))
if len > maxsize:
raise UnpicklingError("BINUNICODE exceeds system's maximum size "
"of %d bytes" % maxsize)
self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
dispatch[BINUNICODE[0]] = load_binunicode
def load_binunicode8(self):
len, = unpack('<Q', self.read(8))
if len > maxsize:
raise UnpicklingError("BINUNICODE8 exceeds system's maximum size "
"of %d bytes" % maxsize)
self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
dispatch[BINUNICODE8[0]] = load_binunicode8
def load_binbytes8(self):
len, = unpack('<Q', self.read(8))
if len > maxsize:
raise UnpicklingError("BINBYTES8 exceeds system's maximum size "
"of %d bytes" % maxsize)
self.append(self.read(len))
dispatch[BINBYTES8[0]] = load_binbytes8
def load_bytearray8(self):
len, = unpack('<Q', self.read(8))
if len > maxsize:
raise UnpicklingError("BYTEARRAY8 exceeds system's maximum size "
"of %d bytes" % maxsize)
b = bytearray(len)
self.readinto(b)
self.append(b)
dispatch[BYTEARRAY8[0]] = load_bytearray8
def load_next_buffer(self):
if self._buffers is None:
raise UnpicklingError("pickle stream refers to out-of-band data "
"but no *buffers* argument was given")
try:
buf = next(self._buffers)
except StopIteration:
raise UnpicklingError("not enough out-of-band buffers")
self.append(buf)
dispatch[NEXT_BUFFER[0]] = load_next_buffer
def load_readonly_buffer(self):
buf = self.stack[-1]
with memoryview(buf) as m:
if not m.readonly:
self.stack[-1] = m.toreadonly()
dispatch[READONLY_BUFFER[0]] = load_readonly_buffer
def load_short_binstring(self):
len = self.read(1)[0]
data = self.read(len)
self.append(self._decode_string(data))
dispatch[SHORT_BINSTRING[0]] = load_short_binstring
def load_short_binbytes(self):
len = self.read(1)[0]
self.append(self.read(len))
dispatch[SHORT_BINBYTES[0]] = load_short_binbytes
def load_short_binunicode(self):
len = self.read(1)[0]
self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
dispatch[SHORT_BINUNICODE[0]] = load_short_binunicode
def load_tuple(self):
items = self.pop_mark()
self.append(tuple(items))
dispatch[TUPLE[0]] = load_tuple
def load_empty_tuple(self):
self.append(())
dispatch[EMPTY_TUPLE[0]] = load_empty_tuple
def load_tuple1(self):
self.stack[-1] = (self.stack[-1],)
dispatch[TUPLE1[0]] = load_tuple1
def load_tuple2(self):
self.stack[-2:] = [(self.stack[-2], self.stack[-1])]
dispatch[TUPLE2[0]] = load_tuple2
def load_tuple3(self):
self.stack[-3:] = [(self.stack[-3], self.stack[-2], self.stack[-1])]
dispatch[TUPLE3[0]] = load_tuple3
def load_empty_list(self):
self.append([])
dispatch[EMPTY_LIST[0]] = load_empty_list
def load_empty_dictionary(self):
self.append({})
dispatch[EMPTY_DICT[0]] = load_empty_dictionary
def load_empty_set(self):
self.append(set())
dispatch[EMPTY_SET[0]] = load_empty_set
def load_frozenset(self):
items = self.pop_mark()
self.append(frozenset(items))
dispatch[FROZENSET[0]] = load_frozenset
def load_list(self):
items = self.pop_mark()
self.append(items)
dispatch[LIST[0]] = load_list
def load_dict(self):
items = self.pop_mark()
d = {items[i]: items[i+1]
for i in range(0, len(items), 2)}
self.append(d)
dispatch[DICT[0]] = load_dict
# INST and OBJ differ only in how they get a class object. It's not
# only sensible to do the rest in a common routine, the two routines
# previously diverged and grew different bugs.
# klass is the class to instantiate, and k points to the topmost mark
# object, following which are the arguments for klass.__init__.
def _instantiate(self, klass, args):
if (args or not isinstance(klass, type) or
hasattr(klass, "__getinitargs__")):
try:
value = klass(*args)
except TypeError as err:
raise TypeError("in constructor for %s: %s" %
(klass.__name__, str(err)), sys.exc_info()[2])
else:
value = klass.__new__(klass)
self.append(value)
def load_inst(self):
module = self.readline()[:-1].decode("ascii")
name = self.readline()[:-1].decode("ascii")
klass = self.find_class(module, name)
self._instantiate(klass, self.pop_mark())
dispatch[INST[0]] = load_inst
def load_obj(self):
# Stack is ... markobject classobject arg1 arg2 ...
args = self.pop_mark()
cls = args.pop(0)
self._instantiate(cls, args)
dispatch[OBJ[0]] = load_obj
def load_newobj(self):
args = self.stack.pop()
cls = self.stack.pop()
obj = cls.__new__(cls, *args)
self.append(obj)
dispatch[NEWOBJ[0]] = load_newobj
def load_newobj_ex(self):
kwargs = self.stack.pop()
args = self.stack.pop()
cls = self.stack.pop()
obj = cls.__new__(cls, *args, **kwargs)
self.append(obj)
dispatch[NEWOBJ_EX[0]] = load_newobj_ex
def load_global(self):
module = self.readline()[:-1].decode("utf-8")
name = self.readline()[:-1].decode("utf-8")
klass = self.find_class(module, name)
self.append(klass)
dispatch[GLOBAL[0]] = load_global
def load_stack_global(self):
name = self.stack.pop()
module = self.stack.pop()
if type(name) is not str or type(module) is not str:
raise UnpicklingError("STACK_GLOBAL requires str")
self.append(self.find_class(module, name))
dispatch[STACK_GLOBAL[0]] = load_stack_global
def load_ext1(self):
code = self.read(1)[0]
self.get_extension(code)
dispatch[EXT1[0]] = load_ext1
def load_ext2(self):
code, = unpack('<H', self.read(2))
self.get_extension(code)
dispatch[EXT2[0]] = load_ext2
def load_ext4(self):
code, = unpack('<i', self.read(4))
self.get_extension(code)
dispatch[EXT4[0]] = load_ext4
def get_extension(self, code):
nil = []
obj = _extension_cache.get(code, nil)
if obj is not nil:
self.append(obj)
return
key = _inverted_registry.get(code)
if not key:
if code <= 0: # note that 0 is forbidden
# Corrupt or hostile pickle.
raise UnpicklingError("EXT specifies code <= 0")
raise ValueError("unregistered extension code %d" % code)
obj = self.find_class(*key)
_extension_cache[code] = obj
self.append(obj)
def find_class(self, module, name):
# Subclasses may override this.
sys.audit('pickle.find_class', module, name)
if self.proto < 3 and self.fix_imports:
if (module, name) in _compat_pickle.NAME_MAPPING:
module, name = _compat_pickle.NAME_MAPPING[(module, name)]
elif module in _compat_pickle.IMPORT_MAPPING:
module = _compat_pickle.IMPORT_MAPPING[module]
__import__(module, level=0)
if self.proto >= 4:
return _getattribute(sys.modules[module], name)[0]
else:
return getattr(sys.modules[module], name)
def load_reduce(self):
stack = self.stack
args = stack.pop()
func = stack[-1]
stack[-1] = func(*args)
dispatch[REDUCE[0]] = load_reduce
def load_pop(self):
if self.stack:
del self.stack[-1]
else:
self.pop_mark()
dispatch[POP[0]] = load_pop
def load_pop_mark(self):
self.pop_mark()
dispatch[POP_MARK[0]] = load_pop_mark
def load_dup(self):
self.append(self.stack[-1])
dispatch[DUP[0]] = load_dup
def load_get(self):
i = int(self.readline()[:-1])
try:
self.append(self.memo[i])
except KeyError:
msg = f'Memo value not found at index {i}'
raise UnpicklingError(msg) from None
dispatch[GET[0]] = load_get
def load_binget(self):
i = self.read(1)[0]
try:
self.append(self.memo[i])
except KeyError as exc:
msg = f'Memo value not found at index {i}'
raise UnpicklingError(msg) from None
dispatch[BINGET[0]] = load_binget
def load_long_binget(self):
i, = unpack('<I', self.read(4))
try:
self.append(self.memo[i])
except KeyError as exc:
msg = f'Memo value not found at index {i}'
raise UnpicklingError(msg) from None
dispatch[LONG_BINGET[0]] = load_long_binget
def load_put(self):
i = int(self.readline()[:-1])
if i < 0:
raise ValueError("negative PUT argument")
self.memo[i] = self.stack[-1]
dispatch[PUT[0]] = load_put
def load_binput(self):
i = self.read(1)[0]
if i < 0:
raise ValueError("negative BINPUT argument")
self.memo[i] = self.stack[-1]
dispatch[BINPUT[0]] = load_binput
def load_long_binput(self):
i, = unpack('<I', self.read(4))
if i > maxsize:
raise ValueError("negative LONG_BINPUT argument")
self.memo[i] = self.stack[-1]
dispatch[LONG_BINPUT[0]] = load_long_binput
def load_memoize(self):
memo = self.memo
memo[len(memo)] = self.stack[-1]
dispatch[MEMOIZE[0]] = load_memoize
def load_append(self):
stack = self.stack
value = stack.pop()
list = stack[-1]
list.append(value)
dispatch[APPEND[0]] = load_append
def load_appends(self):
items = self.pop_mark()
list_obj = self.stack[-1]
try:
extend = list_obj.extend
except AttributeError:
pass
else:
extend(items)
return
# Even if the PEP 307 requires extend() and append() methods,
# fall back on append() if the object has no extend() method
# for backward compatibility.
append = list_obj.append
for item in items:
append(item)
dispatch[APPENDS[0]] = load_appends
def load_setitem(self):
stack = self.stack
value = stack.pop()
key = stack.pop()
dict = stack[-1]
dict[key] = value
dispatch[SETITEM[0]] = load_setitem
def load_setitems(self):
items = self.pop_mark()
dict = self.stack[-1]
for i in range(0, len(items), 2):
dict[items[i]] = items[i + 1]
dispatch[SETITEMS[0]] = load_setitems
def load_additems(self):
items = self.pop_mark()
set_obj = self.stack[-1]
if isinstance(set_obj, set):
set_obj.update(items)
else:
add = set_obj.add
for item in items:
add(item)
dispatch[ADDITEMS[0]] = load_additems
def load_build(self):
stack = self.stack
state = stack.pop()
inst = stack[-1]
setstate = getattr(inst, "__setstate__", None)
if setstate is not None:
setstate(state)
return
slotstate = None
if isinstance(state, tuple) and len(state) == 2:
state, slotstate = state
if state:
inst_dict = inst.__dict__
intern = sys.intern
for k, v in state.items():
if type(k) is str:
inst_dict[intern(k)] = v
else:
inst_dict[k] = v
if slotstate:
for k, v in slotstate.items():
setattr(inst, k, v)
dispatch[BUILD[0]] = load_build
def load_mark(self):
self.metastack.append(self.stack)
self.stack = []
self.append = self.stack.append
dispatch[MARK[0]] = load_mark
def load_stop(self):
value = self.stack.pop()
raise _Stop(value)
dispatch[STOP[0]] = load_stop