"""Core implementation of import.

This module is NOT meant to be directly imported! It has been designed such

that it can be bootstrapped into Python as the implementation of import. As

such it requires the injection of specific modules and attributes in order to

work. One should use importlib as the public-facing version of this module.

"""

#

# IMPORTANT: Whenever making changes to this module, be sure to run a top-level

# `make regen-importlib` followed by `make` in order to get the frozen version

# of the module updated. Not doing so will result in the Makefile to fail for

# all others who don't have a ./python around to freeze the module

# in the early stages of compilation.

#

# See importlib._setup() for what is injected into the global namespace.

# When editing this code be aware that code executed at import time CANNOT

# reference any injected objects! This includes not only global code but also

# anything specified at the class level.

def _object_name(obj):

try:

return obj.__qualname__

except AttributeError:

return type(obj).__qualname__

# Bootstrap-related code ######################################################

# Modules injected manually by _setup()

_thread = None

_warnings = None

_weakref = None

# Import done by _install_external_importers()

_bootstrap_external = None

def _wrap(new, old):

"""Simple substitute for functools.update_wrapper."""

for replace in ['__module__', '__name__', '__qualname__', '__doc__']:

if hasattr(old, replace):

setattr(new, replace, getattr(old, replace))

new.__dict__.update(old.__dict__)

def _new_module(name):

return type(sys)(name)

# Module-level locking ########################################################

# For a list that can have a weakref to it.

class _List(list):

__slots__ = ("__weakref__",)

# Copied from weakref.py with some simplifications and modifications unique to

# bootstrapping importlib. Many methods were simply deleting for simplicity, so if they

# are needed in the future they may work if simply copied back in.

class _WeakValueDictionary:

def __init__(self):

self_weakref = _weakref.ref(self)

# Inlined to avoid issues with inheriting from _weakref.ref before _weakref is

# set by _setup(). Since there's only one instance of this class, this is

# not expensive.

class KeyedRef(_weakref.ref):

__slots__ = "key",

def __new__(type, ob, key):

self = super().__new__(type, ob, type.remove)

self.key = key

return self

def __init__(self, ob, key):

super().__init__(ob, self.remove)

@staticmethod

def remove(wr):

nonlocal self_weakref

self = self_weakref()

if self is not None:

if self._iterating:

self._pending_removals.append(wr.key)

else:

_weakref._remove_dead_weakref(self.data, wr.key)

self._KeyedRef = KeyedRef

self.clear()

def clear(self):

self._pending_removals = []

self._iterating = set()

self.data = {}

def _commit_removals(self):

pop = self._pending_removals.pop

d = self.data

while True:

try:

key = pop()

except IndexError:

return

_weakref._remove_dead_weakref(d, key)

def get(self, key, default=None):

if self._pending_removals:

self._commit_removals()

try:

wr = self.data[key]

except KeyError:

return default

else:

if (o := wr()) is None:

return default

else:

return o

def setdefault(self, key, default=None):

try:

o = self.data[key]()

except KeyError:

o = None

if o is None:

if self._pending_removals:

self._commit_removals()

self.data[key] = self._KeyedRef(default, key)

return default

else:

return o

# A dict mapping module names to weakrefs of _ModuleLock instances.

# Dictionary protected by the global import lock.

_module_locks = {}

# A dict mapping thread IDs to weakref'ed lists of _ModuleLock instances.

# This maps a thread to the module locks it is blocking on acquiring. The

# values are lists because a single thread could perform a re-entrant import

# and be "in the process" of blocking on locks for more than one module. A

# thread can be "in the process" because a thread cannot actually block on

# acquiring more than one lock but it can have set up bookkeeping that reflects

# that it intends to block on acquiring more than one lock.

#

# The dictionary uses a WeakValueDictionary to avoid keeping unnecessary

# lists around, regardless of GC runs. This way there's no memory leak if

# the list is no longer needed (GH-106176).

_blocking_on = None

class _BlockingOnManager:

"""A context manager responsible to updating ``_blocking_on``."""

def __init__(self, thread_id, lock):

self.thread_id = thread_id

self.lock = lock

def __enter__(self):

"""Mark the running thread as waiting for self.lock. via _blocking_on."""

# Interactions with _blocking_on are *not* protected by the global

# import lock here because each thread only touches the state that it

# owns (state keyed on its thread id). The global import lock is

# re-entrant (i.e., a single thread may take it more than once) so it

# wouldn't help us be correct in the face of re-entrancy either.

self.blocked_on = _blocking_on.setdefault(self.thread_id, _List())

self.blocked_on.append(self.lock)

def __exit__(self, *args, **kwargs):

"""Remove self.lock from this thread's _blocking_on list."""

self.blocked_on.remove(self.lock)

class _DeadlockError(RuntimeError):

pass

def _has_deadlocked(target_id, *, seen_ids, candidate_ids, blocking_on):

"""Check if 'target_id' is holding the same lock as another thread(s).

The search within 'blocking_on' starts with the threads listed in

'candidate_ids'. 'seen_ids' contains any threads that are considered

already traversed in the search.

Keyword arguments:

target_id -- The thread id to try to reach.

seen_ids -- A set of threads that have already been visited.

candidate_ids -- The thread ids from which to begin.

blocking_on -- A dict representing the thread/blocking-on graph. This may

be the same object as the global '_blocking_on' but it is

a parameter to reduce the impact that global mutable

state has on the result of this function.

"""

if target_id in candidate_ids:

# If we have already reached the target_id, we're done - signal that it

# is reachable.

return True

# Otherwise, try to reach the target_id from each of the given candidate_ids.

for tid in candidate_ids:

if not (candidate_blocking_on := blocking_on.get(tid)):

# There are no edges out from this node, skip it.

continue

elif tid in seen_ids:

# bpo 38091: the chain of tid's we encounter here eventually leads

# to a fixed point or a cycle, but does not reach target_id.

# This means we would not actually deadlock. This can happen if

# other threads are at the beginning of acquire() below.

return False

seen_ids.add(tid)

# Follow the edges out from this thread.

edges = [lock.owner for lock in candidate_blocking_on]

if _has_deadlocked(target_id, seen_ids=seen_ids, candidate_ids=edges,

blocking_on=blocking_on):

return True

return False

class _ModuleLock:

"""A recursive lock implementation which is able to detect deadlocks

(e.g. thread 1 trying to take locks A then B, and thread 2 trying to

take locks B then A).

"""

def __init__(self, name):

# Create an RLock for protecting the import process for the

# corresponding module. Since it is an RLock, a single thread will be

# able to take it more than once. This is necessary to support

# re-entrancy in the import system that arises from (at least) signal

# handlers and the garbage collector. Consider the case of:

#

# import foo

# -> ...

# -> importlib._bootstrap._ModuleLock.acquire

# -> ...

# -> <garbage collector>

# -> __del__

# -> import foo

# -> ...

# -> importlib._bootstrap._ModuleLock.acquire

# -> _BlockingOnManager.__enter__

#

# If a different thread than the running one holds the lock then the

# thread will have to block on taking the lock, which is what we want

# for thread safety.

self.lock = _thread.RLock()

self.wakeup = _thread.allocate_lock()

# The name of the module for which this is a lock.

self.name = name

# Can end up being set to None if this lock is not owned by any thread

# or the thread identifier for the owning thread.

self.owner = None

# Represent the number of times the owning thread has acquired this lock

# via a list of True. This supports RLock-like ("re-entrant lock")

# behavior, necessary in case a single thread is following a circular

# import dependency and needs to take the lock for a single module

# more than once.

#

# Counts are represented as a list of True because list.append(True)

# and list.pop() are both atomic and thread-safe in CPython and it's hard

# to find another primitive with the same properties.

self.count = []

# This is a count of the number of threads that are blocking on

# self.wakeup.acquire() awaiting to get their turn holding this module

# lock. When the module lock is released, if this is greater than

# zero, it is decremented and `self.wakeup` is released one time. The

# intent is that this will let one other thread make more progress on

# acquiring this module lock. This repeats until all the threads have

# gotten a turn.

#

# This is incremented in self.acquire() when a thread notices it is

# going to have to wait for another thread to finish.

#

# See the comment above count for explanation of the representation.

self.waiters = []

def has_deadlock(self):

# To avoid deadlocks for concurrent or re-entrant circular imports,

# look at _blocking_on to see if any threads are blocking

# on getting the import lock for any module for which the import lock

# is held by this thread.

return _has_deadlocked(

# Try to find this thread.

target_id=_thread.get_ident(),

seen_ids=set(),

# Start from the thread that holds the import lock for this

# module.

candidate_ids=[self.owner],

# Use the global "blocking on" state.

blocking_on=_blocking_on,

)

def acquire(self):

"""

Acquire the module lock. If a potential deadlock is detected,

a _DeadlockError is raised.

Otherwise, the lock is always acquired and True is returned.

"""

tid = _thread.get_ident()

with _BlockingOnManager(tid, self):

while True:

# Protect interaction with state on self with a per-module

# lock. This makes it safe for more than one thread to try to

# acquire the lock for a single module at the same time.

with self.lock:

if self.count == [] or self.owner == tid:

# If the lock for this module is unowned then we can

# take the lock immediately and succeed. If the lock

# for this module is owned by the running thread then

# we can also allow the acquire to succeed. This

# supports circular imports (thread T imports module A

# which imports module B which imports module A).

self.owner = tid

self.count.append(True)

return True

# At this point we know the lock is held (because count !=

# 0) by another thread (because owner != tid). We'll have

# to get in line to take the module lock.

# But first, check to see if this thread would create a

# deadlock by acquiring this module lock. If it would

# then just stop with an error.

#

# It's not clear who is expected to handle this error.

# There is one handler in _lock_unlock_module but many

# times this method is called when entering the context

# manager _ModuleLockManager instead - so _DeadlockError

# will just propagate up to application code.

#

# This seems to be more than just a hypothetical -

# https://stackoverflow.com/questions/59509154

# https://github.com/encode/django-rest-framework/issues/7078

if self.has_deadlock():

raise _DeadlockError(f'deadlock detected by {self!r}')

# Check to see if we're going to be able to acquire the

# lock. If we are going to have to wait then increment

# the waiters so `self.release` will know to unblock us

# later on. We do this part non-blockingly so we don't

# get stuck here before we increment waiters. We have

# this extra acquire call (in addition to the one below,

# outside the self.lock context manager) to make sure

# self.wakeup is held when the next acquire is called (so

# we block). This is probably needlessly complex and we

# should just take self.wakeup in the return codepath

# above.

if self.wakeup.acquire(False):

self.waiters.append(None)

# Now take the lock in a blocking fashion. This won't

# complete until the thread holding this lock

# (self.owner) calls self.release.

self.wakeup.acquire()

# Taking the lock has served its purpose (making us wait), so we can

# give it up now. We'll take it w/o blocking again on the

# next iteration around this 'while' loop.

self.wakeup.release()

def release(self):

tid = _thread.get_ident()

with self.lock:

if self.owner != tid:

raise RuntimeError('cannot release un-acquired lock')

assert len(self.count) > 0

self.count.pop()

if not len(self.count):

self.owner = None

if len(self.waiters) > 0:

self.waiters.pop()

self.wakeup.release()

def locked(self):

return bool(self.count)

def __repr__(self):

return f'_ModuleLock({self.name!r}) at {id(self)}'

class _DummyModuleLock:

"""A simple _ModuleLock equivalent for Python builds without

multi-threading support."""

def __init__(self, name):

self.name = name

self.count = 0

def acquire(self):

self.count += 1

return True

def release(self):

if self.count == 0:

raise RuntimeError('cannot release un-acquired lock')

self.count -= 1

def __repr__(self):

return f'_DummyModuleLock({self.name!r}) at {id(self)}'

class _ModuleLockManager:

def __init__(self, name):

self._name = name

self._lock = None

def __enter__(self):

self._lock = _get_module_lock(self._name)

self._lock.acquire()

def __exit__(self, *args, **kwargs):

self._lock.release()

# The following two functions are for consumption by Python/import.c.

def _get_module_lock(name):

"""Get or create the module lock for a given module name.

Acquire/release internally the global import lock to protect

_module_locks."""

_imp.acquire_lock()

try:

try:

lock = _module_locks[name]()

except KeyError:

lock = None

if lock is None:

if _thread is None:

lock = _DummyModuleLock(name)

else:

lock = _ModuleLock(name)

def cb(ref, name=name):

_imp.acquire_lock()

try:

# bpo-31070: Check if another thread created a new lock

# after the previous lock was destroyed

# but before the weakref callback was called.

if _module_locks.get(name) is ref:

del _module_locks[name]

finally:

_imp.release_lock()

_module_locks[name] = _weakref.ref(lock, cb)

finally:

_imp.release_lock()

return lock

def _lock_unlock_module(name):

"""Acquires then releases the module lock for a given module name.

This is used to ensure a module is completely initialized, in the

event it is being imported by another thread.

"""

lock = _get_module_lock(name)

try:

lock.acquire()

except _DeadlockError:

# Concurrent circular import, we'll accept a partially initialized

# module object.

pass

else:

lock.release()

# Frame stripping magic ###############################################

def _call_with_frames_removed(f, *args, **kwds):

"""remove_importlib_frames in import.c will always remove sequences

of importlib frames that end with a call to this function

Use it instead of a normal call in places where including the importlib

frames introduces unwanted noise into the traceback (e.g. when executing

module code)

"""

return f(*args, **kwds)

def _verbose_message(message, *args, verbosity=1):

"""Print the message to stderr if -v/PYTHONVERBOSE is turned on."""

if sys.flags.verbose >= verbosity:

if not message.startswith(('#', 'import ')):

message = '# ' + message

print(message.format(*args), file=sys.stderr)

def _requires_builtin(fxn):

"""Decorator to verify the named module is built-in."""

def _requires_builtin_wrapper(self, fullname):

if fullname not in sys.builtin_module_names:

raise ImportError(f'{fullname!r} is not a built-in module',

name=fullname)

return fxn(self, fullname)

_wrap(_requires_builtin_wrapper, fxn)

return _requires_builtin_wrapper

def _requires_frozen(fxn):

"""Decorator to verify the named module is frozen."""

def _requires_frozen_wrapper(self, fullname):

if not _imp.is_frozen(fullname):

raise ImportError(f'{fullname!r} is not a frozen module',

name=fullname)

return fxn(self, fullname)

_wrap(_requires_frozen_wrapper, fxn)

return _requires_frozen_wrapper

# Module specifications #######################################################

def _module_repr(module):

"""The implementation of ModuleType.__repr__()."""

loader = getattr(module, '__loader__', None)

if spec := getattr(module, "__spec__", None):

return _module_repr_from_spec(spec)

# Fall through to a catch-all which always succeeds.

try:

name = module.__name__

except AttributeError:

name = '?'

try:

filename = module.__file__

except AttributeError:

if loader is None:

return f'<module {name!r}>'

else:

return f'<module {name!r} ({loader!r})>'

else:

return f'<module {name!r} from {filename!r}>'

class ModuleSpec:

"""The specification for a module, used for loading.

A module's spec is the source for information about the module. For

data associated with the module, including source, use the spec's

loader.

`name` is the absolute name of the module. `loader` is the loader

to use when loading the module. `parent` is the name of the

package the module is in. The parent is derived from the name.

`is_package` determines if the module is considered a package or

not. On modules this is reflected by the `__path__` attribute.

`origin` is the specific location used by the loader from which to

load the module, if that information is available. When filename is

set, origin will match.

`has_location` indicates that a spec's "origin" reflects a location.

When this is True, `__file__` attribute of the module is set.

`cached` is the location of the cached bytecode file, if any.

`submodule_search_locations` is the sequence of path entries to

search when importing submodules. If set, is_package should be

True--and False otherwise.

Packages are simply modules that (may) have submodules. If a spec

has a non-None value in `submodule_search_locations`, the import

system will consider modules loaded from the spec as packages.

Only finders (see importlib.abc.MetaPathFinder and

importlib.abc.PathEntryFinder) should modify ModuleSpec instances.

"""

def __init__(self, name, loader, *, origin=None, loader_state=None,

is_package=None):

self.name = name

self.loader = loader

self.origin = origin

self.loader_state = loader_state

self.submodule_search_locations = [] if is_package else None

self._uninitialized_submodules = []

# file-location attributes

self._set_fileattr = False

self._cached = None

def __repr__(self):

args = [f'name={self.name!r}', f'loader={self.loader!r}']

if self.origin is not None:

args.append(f'origin={self.origin!r}')

if self.submodule_search_locations is not None:

args.append(f'submodule_search_locations={self.submodule_search_locations}')

return f'{self.__class__.__name__}({", ".join(args)})'

def __eq__(self, other):

smsl = self.submodule_search_locations

try:

return (self.name == other.name and

self.loader == other.loader and

self.origin == other.origin and

smsl == other.submodule_search_locations and

self.cached == other.cached and

self.has_location == other.has_location)

except AttributeError:

return NotImplemented

@property

def cached(self):

if self._cached is None:

if self.origin is not None and self._set_fileattr:

if _bootstrap_external is None:

raise NotImplementedError

self._cached = _bootstrap_external._get_cached(self.origin)

return self._cached

@cached.setter

def cached(self, cached):

self._cached = cached

@property

def parent(self):

"""The name of the module's parent."""

if self.submodule_search_locations is None:

return self.name.rpartition('.')[0]

else:

return self.name

@property

def has_location(self):

return self._set_fileattr

@has_location.setter

def has_location(self, value):

self._set_fileattr = bool(value)

def spec_from_loader(name, loader, *, origin=None, is_package=None):

"""Return a module spec based on various loader methods."""

if origin is None:

origin = getattr(loader, '_ORIGIN', None)

if not origin and hasattr(loader, 'get_filename'):

if _bootstrap_external is None:

raise NotImplementedError

spec_from_file_location = _bootstrap_external.spec_from_file_location

if is_package is None:

return spec_from_file_location(name, loader=loader)

search = [] if is_package else None

return spec_from_file_location(name, loader=loader,

submodule_search_locations=search)

if is_package is None:

if hasattr(loader, 'is_package'):

try:

is_package = loader.is_package(name)

except ImportError:

is_package = None # aka, undefined

else:

# the default

is_package = False

return ModuleSpec(name, loader, origin=origin, is_package=is_package)

def _spec_from_module(module, loader=None, origin=None):

# This function is meant for use in _setup().

try:

spec = module.__spec__

except AttributeError:

pass

else:

if spec is not None:

return spec

name = module.__name__

if loader is None:

try:

loader = module.__loader__

except AttributeError:

# loader will stay None.

pass

try:

location = module.__file__

except AttributeError:

location = None

if origin is None:

if loader is not None:

origin = getattr(loader, '_ORIGIN', None)

if not origin and location is not None:

origin = location

try:

submodule_search_locations = list(module.__path__)

except AttributeError:

submodule_search_locations = None

spec = ModuleSpec(name, loader, origin=origin)

spec._set_fileattr = False if location is None else (origin == location)

spec.cached = None

spec.submodule_search_locations = submodule_search_locations

return spec

def _init_module_attrs(spec, module, *, override=False):

# The passed-in module may be not support attribute assignment,

# in which case we simply don't set the attributes.

# __name__

if (override or getattr(module, '__name__', None) is None):

try:

module.__name__ = spec.name

except AttributeError:

pass

# __loader__

if override or getattr(module, '__loader__', None) is None:

loader = spec.loader

if loader is None:

# A backward compatibility hack.

if spec.submodule_search_locations is not None:

if _bootstrap_external is None:

raise NotImplementedError

NamespaceLoader = _bootstrap_external.NamespaceLoader

loader = NamespaceLoader.__new__(NamespaceLoader)

loader._path = spec.submodule_search_locations

spec.loader = loader

# While the docs say that module.__file__ is not set for

# built-in modules, and the code below will avoid setting it if

# spec.has_location is false, this is incorrect for namespace

# packages. Namespace packages have no location, but their

# __spec__.origin is None, and thus their module.__file__

# should also be None for consistency. While a bit of a hack,

# this is the best place to ensure this consistency.

#

# See bpo-32305

module.__file__ = None

try:

module.__loader__ = loader

except AttributeError:

pass

# __package__

if override or getattr(module, '__package__', None) is None:

try:

module.__package__ = spec.parent

except AttributeError:

pass

# __spec__

try:

module.__spec__ = spec

except AttributeError:

pass

# __path__

if override or getattr(module, '__path__', None) is None:

if spec.submodule_search_locations is not None:

# XXX We should extend __path__ if it's already a list.

try:

module.__path__ = spec.submodule_search_locations

except AttributeError:

pass

# __file__

if spec.has_location:

if override or getattr(module, '__file__', None) is None:

try:

module.__file__ = spec.origin

except AttributeError:

pass

return module

def module_from_spec(spec):

"""Create a module based on the provided spec."""

# Typically loaders will not implement create_module().

module = None

if hasattr(spec.loader, 'create_module'):

# If create_module() returns `None` then it means default

# module creation should be used.

module = spec.loader.create_module(spec)

elif hasattr(spec.loader, 'exec_module'):

raise ImportError('loaders that define exec_module() '

'must also define create_module()')

if module is None:

module = _new_module(spec.name)

_init_module_attrs(spec, module)

return module

def _module_repr_from_spec(spec):

"""Return the repr to use for the module."""

name = '?' if spec.name is None else spec.name

if spec.origin is None:

loader = spec.loader

if loader is None:

return f'<module {name!r}>'

elif (

_bootstrap_external is not None

and isinstance(loader, _bootstrap_external.NamespaceLoader)

):

return f'<module {name!r} (namespace) from {list(loader._path)}>'

else:

return f'<module {name!r} ({loader!r})>'

else:

if spec.has_location:

return f'<module {name!r} from {spec.origin!r}>'

else:

return f'<module {spec.name!r} ({spec.origin})>'

# Used by importlib.reload().

def _exec(spec, module):

"""Execute the spec's specified module in an existing module's namespace."""

name = spec.name

with _ModuleLockManager(name):

if sys.modules.get(name) is not module:

msg = f'module {name!r} not in sys.modules'

raise ImportError(msg, name=name)

try:

if spec.loader is None:

if spec.submodule_search_locations is None:

raise ImportError('missing loader', name=spec.name)

# Namespace package.

_init_module_attrs(spec, module, override=True)

else:

_init_module_attrs(spec, module, override=True)

spec.loader.exec_module(module)

finally:

# Update the order of insertion into sys.modules for module

# clean-up at shutdown.

module = sys.modules.pop(spec.name)

sys.modules[spec.name] = module

return module

def _load_unlocked(spec):

# A helper for direct use by the import system.

module = module_from_spec(spec)

# This must be done before putting the module in sys.modules

# (otherwise an optimization shortcut in import.c becomes

# wrong).

spec._initializing = True

try:

sys.modules[spec.name] = module

try:

if spec.loader is None:

if spec.submodule_search_locations is None:

raise ImportError('missing loader', name=spec.name)

# A namespace package so do nothing.

else:

spec.loader.exec_module(module)

except:

try:

del sys.modules[spec.name]

except KeyError:

pass

raise

# Move the module to the end of sys.modules.

# We don't ensure that the import-related module attributes get

# set in the sys.modules replacement case. Such modules are on

# their own.

module = sys.modules.pop(spec.name)

sys.modules[spec.name] = module

_verbose_message('import {!r} # {!r}', spec.name, spec.loader)

finally:

spec._initializing = False

return module

# A method used during testing of _load_unlocked().

def _load(spec):

"""Return a new module object, loaded by the spec's loader.

The module is not added to its parent.

If a module is already in sys.modules, that existing module gets

clobbered.

"""

with _ModuleLockManager(spec.name):

return _load_unlocked(spec)

# Loaders #####################################################################

class BuiltinImporter:

"""Meta path import for built-in modules.

All methods are either class or static methods to avoid the need to

instantiate the class.

"""

_ORIGIN = "built-in"

@classmethod

def find_spec(cls, fullname, path=None, target=None):

if _imp.is_builtin(fullname):

return spec_from_loader(fullname, cls, origin=cls._ORIGIN)

else:

return None

@staticmethod

def create_module(spec):

"""Create a built-in module"""

if spec.name not in sys.builtin_module_names:

raise ImportError(f'{spec.name!r} is not a built-in module',

name=spec.name)

return _call_with_frames_removed(_imp.create_builtin, spec)

@staticmethod

def exec_module(module):

"""Exec a built-in module"""

_call_with_frames_removed(_imp.exec_builtin, module)

@classmethod

@_requires_builtin

def get_code(cls, fullname):

"""Return None as built-in modules do not have code objects."""

return None

@classmethod

@_requires_builtin

def get_source(cls, fullname):

"""Return None as built-in modules do not have source code."""

return None

@classmethod

@_requires_builtin

def is_package(cls, fullname):

"""Return False as built-in modules are never packages."""

return False

class FrozenImporter:

"""Meta path import for frozen modules.

All methods are either class or static methods to avoid the need to

instantiate the class.

"""

_ORIGIN = "frozen"

@classmethod

def _fix_up_module(cls, module):

spec = module.__spec__

state = spec.loader_state

if state is None:

# The module is missing FrozenImporter-specific values.

# Fix up the spec attrs.

origname = vars(module).pop('__origname__', None)

assert origname, 'see PyImport_ImportFrozenModuleObject()'

ispkg = hasattr(module, '__path__')

assert _imp.is_frozen_package(module.__name__) == ispkg, ispkg

filename, pkgdir = cls._resolve_filename(origname, spec.name, ispkg)

spec.loader_state = type(sys.implementation)(

filename=filename,

origname=origname,

)

__path__ = spec.submodule_search_locations

if ispkg:

assert __path__ == [], __path__

if pkgdir:

spec.submodule_search_locations.insert(0, pkgdir)

else:

assert __path__ is None, __path__

# Fix up the module attrs (the bare minimum).

assert not hasattr(module, '__file__'), module.__file__

if filename:

try:

module.__file__ = filename

except AttributeError:

pass

if ispkg:

if module.__path__ != __path__:

assert module.__path__ == [], module.__path__

module.__path__.extend(__path__)

else:

# These checks ensure that _fix_up_module() is only called

# in the right places.

__path__ = spec.submodule_search_locations

ispkg = __path__ is not None

# Check the loader state.

assert sorted(vars(state)) == ['filename', 'origname'], state

if state.origname:

# The only frozen modules with "origname" set are stdlib modules.

(__file__, pkgdir,

) = cls._resolve_filename(state.origname, spec.name, ispkg)

assert state.filename == __file__, (state.filename, __file__)