[Python-Dev] PEP 575 (Unifying function/method classes) update

Antoine Pitrou solipsis at pitrou.net
Tue Jun 19 04:47:00 EDT 2018

On Mon, 18 Jun 2018 19:49:28 +0200
Stefan Behnel <stefan_ml at behnel.de> wrote:
> Victor Stinner schrieb am 18.06.2018 um 15:09:
> > I tried two options to add support for FASTCALL on calling an object:
> > add a flag in tp_flags and reuse tp_call, or add a new tp_fastcall
> > slot. I failed to implement correctly any of these two options.
> > 
> > There are multiple issues with tp_fastcall:
> > 
> > * ABI issue: it's possible to load a C extension using the old ABI,
> > without tp_fastcall: it's not possible to write type->tp_fastcall on
> > such type. This limitation causes different issues.  
> Not a problem if we rededicate the unused (since Py3.0) "tp_print" slot for it.

On the topic of the so-called old ABI (which doesn't really exist), I
would like to merge https://github.com/python/cpython/pull/4944



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