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bpo-9263: _PyObject_Dump() detects freed memory (GH-10061)

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_PyObject_Dump() now uses an heuristic to check if the object memory
has been freed: log "<freed object>" in that case.

The heuristic rely on the debug hooks on Python memory allocators
which fills the memory with DEADBYTE (0xDB) when memory is
deallocated. Use PYTHONMALLOC=debug to always enable these debug
hooks.
This commit is contained in:
Victor Stinner 2018-10-23 17:39:40 +02:00 • committed by GitHub
parent 96f2c73954
commit 82af0b63b0
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4 changed files with 75 additions and 24 deletions
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Include/pymem.h
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@ -55,7 +55,9 @@ PyAPI_FUNC(int) PyTraceMalloc_Untrack(
PyAPI_FUNC(PyObject*) _PyTraceMalloc_GetTraceback(
unsigned int domain,
uintptr_t ptr);
#endif /* !Py_LIMITED_API */
PyAPI_FUNC(int) _PyMem_IsFreed(void *ptr, size_t size);
#endif /* !defined(Py_LIMITED_API) */
/* BEWARE: