[pypy-dev] Information from the FlowObjSpace

Christian Tismer tismer at stackless.com
Thu Apr 13 04:39:41 CEST 2006

Brian C. Lum wrote:
>  Dear Pypy developers:
> I have gone through the source code for the FlowObjSpace in 
> pypy.objspace.flow.objspace, but I am confused how to traverse through 
> the blocks or obtain the information for each blocks in the graph.  From 
> my understanding:
> space = FlowObjSpace()
> graph = space.build_flow(func)
> Once you have the graph, however, how do you know what instructions are 
> in each block?  I can iterate through the graph with iterblocks, but how 
> do I get information from each block?
> I want to analyze the information in each block to do code analysis for 
> python.  Can anyone help me with this?

First of all, flowing doesn't work for full CPython. You need
to use the RPython subset (see 

Then, if you have a block, you can iterate over block.operations
which is a list, and so on. See pypy/objspace/flow/model.py

ciao - chris
Christian Tismer             :^)   <mailto:tismer at stackless.com>
tismerysoft GmbH             :     Have a break! Take a ride on Python's
Johannes-Niemeyer-Weg 9A     :    *Starship* http://starship.python.net/
14109 Berlin                 :     PGP key -> http://wwwkeys.pgp.net/
work +49 30 802 86 56  mobile +49 173 24 18 776  fax +49 30 80 90 57 05
PGP 0x57F3BF04       9064 F4E1 D754 C2FF 1619  305B C09C 5A3B 57F3 BF04
      whom do you want to sponsor today?   http://www.stackless.com/

More information about the Pypy-dev mailing list