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116 lines
3.2 KiB
116 lines
3.2 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 |
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class Foo(object): |
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__slots__ = ('a','b') |
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def __init__(self, a=1234) -> None: |
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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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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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print("\n############# Phase 1 ##################") |
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foo = Foo(v1) |
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print(f"{gc.get_referents(foo)=}") |
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print(f"{gc.get_count()=}") |
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print(f"{foo.a=} - {foo.b=} - {foo.f()=}") |
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del foo |
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print(f"{gc.collect()=}") |
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print("\n############# Phase 2 ##################") |
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foo = Foo(v1) |
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bar = foo.a |
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print(f"{gc.get_referents(foo)=}") |
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print(f"{gc.get_count()=}") |
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print(f"{foo.a=} - {foo.b=} - {foo.f()=} - {bar=}") |
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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("\n############# Phase 3 ##################") |
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foo = Foo(v1) |
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bar = foo.b |
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print(f"{gc.get_referents(foo)=}") |
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print(f"{gc.get_count()=}") |
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print(f"{foo.a=} - {foo.b=} - {foo.f()=} - {bar()=}") |
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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("\n############# Phase 4 ##################") |
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foo = Foo(v1) |
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bar = foo.b |
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print(f"{gc.get_referents(foo)=}") |
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print(f"{gc.get_referents(v1)=}") |
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print(f"{gc.get_count()=}") |
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print(f"{foo.a=} - {foo.b=} - {foo.f()=} - {bar()=}") |
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del foo |
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pobjs() |
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print(f"{gc.collect()=}") |
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print(f"{bar()=}") |
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del bar |
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pobjs() |
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print(f"{gc.collect()=}") |
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pobjs() |
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print("\n############# Phase 5 ##################") |
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foo = Foo(v1) |
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bar = weakref.ref(foo.b) |
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xx = foo.f |
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baz = weakref.ref(xx) |
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print(f"{gc.get_referents(foo)=}") |
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print(f"{gc.get_referents(v1)=}") |
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print(f"{gc.get_count()=}") |
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print(f"{foo.a=} - {foo.b=} - {foo.f()=} - {bar()()=}") |
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del foo |
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pobjs() |
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print(f"{gc.collect()=}") |
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print(f"{bar()() if bar() else None=}") |
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del bar |
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pobjs() |
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print(f"{gc.collect()=}") |
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pobjs() |
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print(f"{gc.garbage=}") |
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print(f"End {gc.get_count()=}")
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