IPA / Cgraph how to get a real COPY of a function body

[Martin Jambor]

Hi,

On Tue, Sep 16, 2008 at 12:24:13PM +0200, Martin Schindewolf wrote:
> Dear all,
>
> my current efforts to get some basic support for transactional memory in 
> GCC advance slowly but there is one thing I would like to ask because it 
> stopped me for days now. What is the best way to do the function cloning in 
> order to have the original function and a transactional clone at the same 
> time? I tried all sorts of cloning and copying the whole tree using 
> functions from Cgraph and Ipa passes but somehow I always end up with a 
> cloned declaration node and a function body that is not a copy of the 
> original but a pointer to it. At least that is my experience until now. 
> Following the general idea of having a copy of the original function early 
> in the passes and inserting the necessary instrumentations later when the 
> expansion of the GTM primitives is done, this behaviour leads to problems. 
> What would be the best way to get a real copy of a function body?
>

I believe cgraph_function_versioning() is what you are looking for.
Have a look at how it is used in ipa-cp.c.

HTH

Martin