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bpo-36389: _PyObject_IsFreed() now also detects uninitialized memory (GH-12770)

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Replace _PyMem_IsFreed() function with _PyMem_IsPtrFreed() inline
function. The function is now way more efficient, it became a simple
comparison on integers, rather than a short loop. It detects also
uninitialized bytes and "forbidden bytes" filled by debug hooks
on memory allocators.

Add unit tests on _PyObject_IsFreed().
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Victor Stinner 2019-04-11 11:33:27 +02:00 • committed by GitHub
parent 57b1a2862a
commit 2b00db6855
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6 changed files with 113 additions and 27 deletions
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Include/pymem.h
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@ -23,8 +23,6 @@ PyAPI_FUNC(int) _PyMem_SetupAllocators(const char *opt);
/* Try to get the allocators name set by _PyMem_SetupAllocators(). */
PyAPI_FUNC(const char*) _PyMem_GetAllocatorsName(void);
PyAPI_FUNC(int) _PyMem_IsFreed(void *ptr, size_t size);
#endif /* !defined(Py_LIMITED_API) */