gh-105927: PyImport_AddModule() uses _PyWeakref_GET_REF()#106001
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vstinner requested review from brettcannon, ericsnowcurrently, ncoghlan and warsaw as code owners
It now raises an exception if sys.modules doesn't hold a strong reference to the module. Elaborate the comment explaining why a weak reference is used to create a borrowed reference.
| Py_DECREF(ref); | ||
| Py_XDECREF(mod); | ||
| if (mod==NULL&& !PyErr_Occurred()){ |
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I am not sure that comparing mod with NULL after Py_XDECREF does not have an undefined behavior. AFAIK, you can do nothing with a pointer to released memory, not even compare it with NULL.
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See comments of my PR #105998: IMO most of this code is useless and can be removed.
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It now raises an exception if sys.modules doesn't hold a strong reference to the module.
Elaborate the comment explaining why a weak reference is used to create a borrowed reference.