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[3.12] GH-117195: Avoid assertion error in object.__sizeof__ (GH-117220) (#127605)

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GH-117195: Avoid assertion error in `object.__sizeof__` (GH-117220)
(cherry picked from commit 406ffb5293)

Co-authored-by: Mark Shannon <mark@hotpy.org>
This commit is contained in:
Miss Islington (bot) 2024-12-11 12:21:07 +01:00 • committed by GitHub
parent 487a51a1b9
commit 0964f9f184
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3 changed files with 9 additions and 2 deletions
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2
Lib/test/test_long.py
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@ -1639,6 +1639,8 @@ class LongTest(unittest.TestCase):
MyInt.__basicsize__ + MyInt.__itemsize__ * ndigits
)
# GH-117195 -- This shouldn't crash
object.__sizeof__(1)
if __name__ == "__main__":
unittest.main()

2
Misc/NEWS.d/next/Core and Builtins/2024-03-25-15-07-01.gh-issue-117195.OWakgD.rst Normal file
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@ -0,0 +1,2 @@
Avoid assertion failure for debug builds when calling
``object.__sizeof__(1)``

7
Objects/typeobject.c
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@ -6462,8 +6462,11 @@ object___sizeof___impl(PyObject *self)
res = 0;
isize = Py_TYPE(self)->tp_itemsize;
if (isize > 0)
res = Py_SIZE(self) * isize;
if (isize > 0) {
/* This assumes that ob_size is valid if tp_itemsize is not 0,
which isn't true for PyLongObject. */
res = _PyVarObject_CAST(self)->ob_size * isize;
}
res += Py_TYPE(self)->tp_basicsize;
return PyLong_FromSsize_t(res);