gh-99845: Use size_t type in __sizeof__() methods (#99846)

The implementation of __sizeof__() methods using _PyObject_SIZE() now
use an unsigned type (size_t) to compute the size, rather than a signed
type (Py_ssize_t).

Cast explicitly signed (Py_ssize_t) values to unsigned type
(Py_ssize_t).

1 files changed, 3 insertions, 4 deletions

diff --git a/Objects/listobject.c b/Objects/listobject.c
index da623c9..0e696fb 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2806,10 +2806,9 @@ static PyObject *
 list___sizeof___impl(PyListObject *self)
 /*[clinic end generated code: output=3417541f95f9a53e input=b8030a5d5ce8a187]*/
 {
-    Py_ssize_t res;
-
-    res = _PyObject_SIZE(Py_TYPE(self)) + self->allocated * sizeof(void*);
-    return PyLong_FromSsize_t(res);
+    size_t res = _PyObject_SIZE(Py_TYPE(self));
+    res += (size_t)self->allocated * sizeof(void*);
+    return PyLong_FromSize_t(res);
 }
 
 static PyObject *list_iter(PyObject *seq);