bpo-38070: visit_decref() calls _PyObject_IsFreed()#15782
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In debug mode, visit_decref() now calls _PyObject_IsFreed() to ensure that the object is not freed. If it's freed, the program fails with an assertion error and Python dumps informations about the freed object.
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I compared performances without/with the change. (*) Test 1: ./configure --with-pydebug; make; ./python -m test -j0 # using 8 logical CPUs and gcc -Og
(*) Test 2: bm_deltablue.py of pyperformance "Benchmark hidden because not significant (1): deltablue" Ok, it seems like this change has no significant impact on a debug build of Python. |
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.8. |
miss-islington
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In debug mode, visit_decref() now calls _PyObject_IsFreed() to ensure that the object is not freed. If it's freed, the program fails with an assertion error and Python dumps informations about the freed object. (cherry picked from commit d91d4de) Co-authored-by: Victor Stinner <vstinner@redhat.com>
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GH-15793 is a backport of this pull request to the 3.8 branch. |
miss-islington
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In debug mode, visit_decref() now calls _PyObject_IsFreed() to ensure that the object is not freed. If it's freed, the program fails with an assertion error and Python dumps informations about the freed object. (cherry picked from commit d91d4de) Co-authored-by: Victor Stinner <vstinner@redhat.com>
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In debug mode, visit_decref() now calls _PyObject_IsFreed() to ensure that the object is not freed. If it's freed, the program fails with an assertion error and Python dumps informations about the freed object.
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In debug mode, visit_decref() now calls _PyObject_IsFreed() to ensure
that the object is not freed. If it's freed, the program fails with
an assertion error and Python dumps informations about the freed
object.
https://bugs.python.org/issue38070