[pypy-dev] Re: infos from the berlin-sprint (was Re: Sprint results?)

Florian Schulze florian.proff.schulze at gmx.net
Sun Oct 5 21:21:59 CEST 2003

On Sun, 5 Oct 2003 18:36:32 +0200, holger krekel <hpk at trillke.net> wrote:

> Hi Florian,


First: Thanks to Laura and Holger for the replies!

> So alltogether the Flowgraph/Functiongraph/flowmodel (there is no
> completly fixed terminology yet) is the central point for several
> independent algorithms that - if combined - eventually produce typed 
> C-code.
> To sum it up there are the following abstractions:
> interpreter     interpreting bytecode, dispatching operations on objects 
> to
> objectspace     implementing operations on boxed objects
> stdobjspace     a concrete space implementing python's standard type 
> system
> flowobjspace    a conrete space performing abstract/symbolic 
> interpretation and
>                 producing a (bytecode-indepedent) flowmodel of execution
> annotator       analysing the flowmodel to infer types.
> genpyrex        taking the (annotated) flowmodel to generate pyrex-code
> pyrex           translating into an C-extension

Just a few questions about this: As far as I can tell there is no script 
yet, which just takes a python file and generates Pyrex code, correct? 
What would be needed?
- a way to get functions from a python module
- build_flow from the flow object space which takes those functions and 
generates a graph
- GenPyrex from genpyrex.py which takes that graph and emits a pyrex 

I tried out the following with a normal python interpreter in the pypy/src 

>>> import pypy.objspace.flow
>>> space = pypy.objspace.flow.Space()
>>> import pypy.translator.genpyrex
>>> def f():
...     i = 0
...     while i < 10:
...             i = i + 1
...     return i
>>> print pypy.translator.genpyrex.GenPyrex(space.build_flow(f)).emitcode()
def f():

   v21 = 0
   cinline "Label2:"
   v22 = v21 < 10
   if v22:
     v24 = v21 + 1
     v21 = v24
     cinline "goto Label2;"
     v27, v28 = v21, v22
     v29 = v27
     return v29

Which is quite impressive in my opinion.


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