I changed the current type pointer check to look at tp_basicsize instead.
> That made it work for almost all classes in lxml's own Element hierarchy,
> with only a couple of exceptions in lxml.objectify that have one additional
> object field. So, just extending the freelist support to use two different
> lists for different struct sizes instead of just one would make it work for
> all of lxml already. Taking a look at Sage to see how the situation appears
> over there would be interesting, I guess.
>
I found some chains of length 5. This could be shortened to 4 by putting
the freelist at the level of Element (which is where you most care about
speed of object creation).
SageObject
-> Element (_parent attribute and cdef methods)
-> Vector (_degree)
-> FreeModuleElement (_is_mutable)
-> FreeModuleElement_generic_dense (_entries)
SageObject
-> Element (_parent attribute and cdef methods)
->sage.structure.element.Matrix (_nrows)
-> sage.matrix.matrix.Matrix (_base_ring)
-> Matrix_integer_dense (_entries)
This does look cool to have though.
David
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