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Few rules about ctypes keepalives:
* Ownership: the memory is freed when owner of this memory is deleted.
Owner is the one who allocated the memory. So if we have:
a = c_int(3)
b = c_int.from_address(a._buffer.buffer) # pypy notion of address access
only a frees memory.
* _objects: each ctypes object has (eventually) _objects dictionary in which
it simply keeps objects to be kept alive.
* there are (some) rules about when to put stuff in it's objects when
accessing the fields etc. need to list them here.
* each object has _objects dictionary. In this dict stuff is stored per
key, which should be a tuple of indices of storages.
places storing stuff in _objects:
* array item assignement, if we share the storage
* pointer item assignement, if we share the storage
* getitem on CDLL stores function pointer
* CFuncPtr.__new__ (assuming that it's a ctypes callable), stores itself
(XXX???)
* set contents on pointer
* set value on primitive or __init__ on primitive
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