[pypy-dev] Information from the FlowObjSpace

[Christian Tismer]

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 
http://codespeak.net/pypy/dist/pypy/doc/coding-guide.html#restricted-python
)

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
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