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import gc
import weakref
class LateFin:
__slots__ = ('ref',)
def __del__(self):
# 8. Now `latefin`'s finalizer is called. Here we
# obtain a reference to `func`, which is currently
# undergoing `tp_clear`.
global func
func = self.ref()
class Cyclic(tuple):
__slots__ = ()
# 4. The finalizers of all garbage objects are called. In
# this case this is only us as `func` doesn't have a
# finalizer.
def __del__(self):
# 5. Create a weakref to `func` now. If we had created
# it earlier, it would have been cleared by the
# garbage collector before calling the finalizers.
self[1].ref = weakref.ref(self[0])
# 6. Drop the global reference to `latefin`. The only
# remaining reference is the one we have.
global latefin
del latefin
# 7. Now `func` is `tp_clear`-ed. This drops the last
# reference to `Cyclic`, which gets `tp_dealloc`-ed.
# This drops the last reference to `latefin`.
latefin = LateFin()
def func():
pass
cyc = tuple.__new__(Cyclic, (func, latefin))
# 1. Create a reference cycle of `cyc` and `func`.
func.__module__ = cyc
# 2. Make the cycle unreachable, but keep the global reference
# to `latefin` so that it isn't detected as garbage. This
# way its finalizer will not be called immediately.
del func, cyc
# 3. Invoke garbage collection,
# which will find `cyc` and `func` as garbage.
gc.collect()
# 9. Previously, this would crash because `func_qualname`
# had been NULL-ed out by func_clear().
print(f"{func=}")
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Nr a if 1:
import gc
import _testcapi
@_testcapi.with_tp_del
class X:
def __init__(self, name):
self.name = name
def __repr__(self):
return "<X %%r>" %% self.name
def __tp_del__(self):
pass
x = X('first')
x.x = x
x.y = X('second')
del x
gc.set_debug(%s)
c \ t j dd| gj j }| \ }}|j |j |j d |d |S )Nz-Wdr r r r r )
Popenr
executablePIPE communicater closer rI
returncode)r pr r r'
subprocesss r run_commandz5GCTests.test_garbage_at_shutdown.<locals>.run_command s #.%t!D!! ! ( (A ]]__NFF
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HNN Q\1 - - - VS ) ) )Mr 0s= ResourceWarning: gc: 2 uncollectable objects at shutdown; uses <X 'first'>zgc.DEBUG_UNCOLLECTABLEs8 ResourceWarning: gc: 2 uncollectable objects at shutdowns [<X 'first'>, <X 'second'>]s [<X 'second'>, <X 'first'>]zgc.DEBUG_SAVEALLs! uncollectable objects at shutdown)r assertIn assertNotInrW )r' r r r r s ` @r test_garbage_at_shutdownz GCTests.test_garbage_at_shutdown s $ TCZ((
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class C:
def __del__(self):
print('__del__ called')
l = [C()]
l.append(l)
r __del__ called)r rI strip)r' r r outerrs r test_gc_main_module_at_shutdownz'GCTests.test_gc_main_module_at_shutdown
sE (d33 C &788888r c t 5 }d}d|d}t |d| t d| \ }}}| | d d d d d S # 1 swxY w Y d S )Nzif 1:
class C:
def __del__(self):
print('__del__ called')
l = [C()]
l.append(l)
zDif 1:
import sys
sys.path.insert(0, z0)
import gctest
gctestr r )r r r rI r )r'
script_dirmoduler r r r s r #test_gc_ordinary_module_at_shutdownz+GCTests.test_gc_ordinary_module_at_shutdown s
ZZ =:FF "zz $D
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class ClassWithDel:
def __del__(self):
print('__del__ called')
a = ClassWithDel()
a.link = a
raise SystemExit(0)wzutf-8)encodingr )
addCleanupr
r openwriter rI r )r' r scriptr r r s r test_global_del_SystemExitz"GCTests.test_global_del_SystemExit- s #
'''
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