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gh-101266: Fix __sizeof__ for subclasses of int (#101394)

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Fix the behaviour of the `__sizeof__` method (and hence the results returned by `sys.getsizeof`) for subclasses of `int`. Previously, `int` subclasses gave identical results to the `int` base class, ignoring the presence of the instance dictionary.

<!-- gh-issue-number: gh-101266 -->
* Issue: gh-101266
<!-- /gh-issue-number -->
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Mark Dickinson 2023-02-05 10:02:53 +00:00 • committed by GitHub
parent 9b60ee976a
commit 39017e04b5
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4 changed files with 48 additions and 9 deletions
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Objects/longobject.c
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@ -5882,13 +5882,10 @@ static Py_ssize_t
int___sizeof___impl(PyObject *self)
/*[clinic end generated code: output=3303f008eaa6a0a5 input=9b51620c76fc4507]*/
{
Py_ssize_t res;
res = offsetof(PyLongObject, long_value.ob_digit)
/* using Py_MAX(..., 1) because we always allocate space for at least
one digit, even though the integer zero has a Py_SIZE of 0 */
+ Py_MAX(Py_ABS(Py_SIZE(self)), 1)*sizeof(digit);
return res;
/* using Py_MAX(..., 1) because we always allocate space for at least
one digit, even though the integer zero has a Py_SIZE of 0 */
Py_ssize_t ndigits = Py_MAX(Py_ABS(Py_SIZE(self)), 1);
return Py_TYPE(self)->tp_basicsize + Py_TYPE(self)->tp_itemsize * ndigits;
}
/*[clinic input]