[pypy-dev] Concerning bounded number of classes created

[Benjamin Peterson]

2011/12/9 Alexander Golec <alexgolecmailinglists at gmail.com>:
> Hey all,
>
> Sorry to keep asking questions on the mailing list, but I've been doing my
> semester research project on PyPy, and my deadline is beginning to loom...
>
> I have a question concerning what I think is a conflict between the RPython
> coding guide and the 2005 EU paper. The paper states:
>
> Our approach goes further and analyses live programs in memory: the program
> is allowed to contain fully dynamic sections, as long as these sections are
> entered a bounded num- ber of times. For example, the source code of the
> PyPy interpreter, which is itself written in this bounded-dynamism style,
> makes extensive use of the fact that it is possible to build new classes at
> any point in time -- not just during an initialisation phase -- as long as
> the number of new classes is bounded. For example, interpreter/gateway.py
> builds a custom wrapper class corresponding to each function that a
> particular variable can reference. There is a finite num- ber of functions
> in total, so this can only create a finite number of extra wrapper classes.

I'm not actually sure what this is referring to; it may have changed since 2005.

>
> While the coding guide says:
>
>
> definitions
>
> run-time definition of classes or functions is not allowed.

This is the truest statement currently.


-- 
Regards,
Benjamin