[Python-bugs-list] [ python-Bugs-591586 ] Get rid of etype struct

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Bugs item #591586, was opened at 2002-08-06 17:16
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Category: Type/class unification
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Guido van Rossum (gvanrossum)
Assigned to: Guido van Rossum (gvanrossum)
Summary: Get rid of etype struct

Initial Comment:
The 'etype' struct in typeobject.c prevents people like
David Abrahams and Christian Tismer from defining
C-level metatypes that add slots to the end of the type
structure. It should be possible for type_new() to
place the additional structures after an offset
determined by tp_basicsize of the metatype, rather than
at a fixed offset.

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>Comment By: Christian Tismer (tismer)
Date: 2002-09-03 20:12

Message:
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Hi Guido,
I think I have a solution for this one, see the attached diff.
I did what you suggested: Make the adressing of the
members dependant from the metatype.
The etype struct has lost its members[1] field, to make it
easier to extend the structure. Instead, the allocator always
adds one to the size, to have the sentinel in place.

I did not yet publish the etype stucture, since I didn't find
a good name and place for it.
Testing was also not very thorow. I just checked that types
work from Python and that I can add __slots__ to them.
Will re-port this stuff to my Py2.2 Stackless base and try it
out as base type for my own C types.

ciao - chris

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