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105 lines
3.1 KiB
105 lines
3.1 KiB
#!/usr/bin/env python3 |
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# MIT License |
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# |
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# Copyright (c) 2023 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com> |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a copy |
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# of this software and associated documentation files (the "Software"), to deal |
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# in the Software without restriction, including without limitation the rights |
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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# copies of the Software, and to permit persons to whom the Software is |
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# furnished to do so, subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included in all |
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# copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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# Example inspired by |
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# https://stackoverflow.com/questions/39838793/python-object-is-being-referenced-by-an-object-i-cannot-find |
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import gc, weakref, time |
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class Bar(): |
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__slots__ = ('_foo') |
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def __init__(self, foo) -> None: |
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self._foo = foo |
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class Foo(): |
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__slots__ = ('__weakref__','a','b','_bar') |
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def __init__(self, a=1234) -> None: |
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self._bar = Bar(self) |
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self.a = a |
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self.b = lambda : self.a |
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def f(self): |
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return self.a |
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# def __del__(self): |
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# print(f"Deleted {self}") |
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def pobjs(): |
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for i,o in enumerate(gc.get_objects()[-100:]): |
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ss = str(o) |
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if "Foo" in ss: |
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print(f" * {i} - {ss}") |
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def _ref(o): |
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print(f"\n### -> Referents - {o}") |
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for i,r in enumerate(gc.get_referents(o)): |
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print(f" - {i} ) {r}") |
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print(f"\n### -> Referrers - {o}") |
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for i,r in enumerate(gc.get_referrers(o)): |
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print(f" - {i} ) {r}") |
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print("") |
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v1 = {'b':2345} |
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print(f"\nStart {gc.isenabled()=}") |
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# print(f"{gc.set_debug(gc.DEBUG_LEAK)=}") |
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def _gccb(phase,info): |
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print(f" ---> {gc.garbage=}") |
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print(f" ---> {phase=} {info=}") |
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# gc.callbacks.append(_gccb) |
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print("\n############# Phase 1 ##################") |
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foo = Foo(v1) |
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bar =foo.b |
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wrfoo = weakref.ref(foo) |
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wrbar = weakref.ref(bar) |
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wrf = weakref.WeakMethod(foo.f) |
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# print(f"{gc.get_referents(foo)=}") |
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# print(f"{gc.get_referrers(foo)=}") |
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# print(f"{gc.get_referents(v1)=}") |
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# print(f"{gc.get_referrers(v1)=}") |
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# print(f"{gc.get_count()=}") |
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_ref(foo) |
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print(f"{foo.a=} - {foo.b=} - {foo.f()=} - {bar()=}") |
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}") |
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del foo |
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print(f"{gc.collect()=}") |
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print(f"{bar()}") |
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# print(f"{gc.get_referents(v1)=}") |
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# print(f"{gc.get_referrers(v1)=}") |
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}") |
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bar = None |
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}") |
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time.sleep(4) |
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}") |
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print(f"{gc.collect()=}") |
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print(f"{wrfoo()=} {wrbar()=} {wrf()=}") |
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print(f"{gc.garbage=}") |
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print(f"End {gc.get_count()=}")
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