[LLVMdev] Call Graph Analysis and function cloning

[Alireza.Moshtaghi at microchip.com]

Hi Jim,
Yes these are for interrupt handling. I have always learned from you and
of course would like to know about your input.

Thanks
Ali

> -----Original Message-----
> From: Jim Grosbach [mailto:grosbach at apple.com]
> Sent: Friday, August 07, 2009 11:01 AM
> To: LLVM Developers Mailing List
> Cc: Alireza Moshtaghi - C13012
> Subject: Re: [LLVMdev] Call Graph Analysis and function cloning
> 
> Hi Ali,
> 
> I assume this is primarily for interrupt function handling? If so, I
> have a few ideas to bounce your direction if you're interested.
> 
> -j
> 
> 
> On Aug 6, 2009, at 3:32 PM, Alireza.Moshtaghi at microchip.com wrote:
> 
> > I need to perform call graph analysis (after all modules are merged)
> > to
> > find which function calls which, and depending on the attributes
that
> > each function has and what functions call it, I may need to clone it
> > and
> > modify some of calls to that function to call the cloned function.
> >
> > Currently we are doing this in few acrobatic moves that span from an
> > llvm-ld pass (to do call graph analysis) all the way to AsmPrinter
(to
> > clone the function) and eventually our in-house linker (to check for
> > some irregularities). But I don't like it at all and I'm sure we
will
> > run into problems later. So I would like to see if anybody has a
> > better
> > answer for us.
> >
> > I guess the most important question is how best (if possible) can I
> > clone a function before or during codegen.
> > Currently we are cloning the function in AsmPrinter but it does not
> > look
> > good to me.
> >
> > Any thoughts?
> >
> > Alireza Moshtaghi
> > Senior Software Engineer
> > Development Systems, Microchip Technology
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev