[LLVMdev] Dynamic Profiling - Instrumentation basic query

[Sahoo, Swarup Kumar]

Hi John and Silky,

    I can see a copy of 'giri' slicing project branch here http://llvm.org/viewvc/llvm-project/giri/. Though it may be little older, it will work I think. You can look at the code to see how we do the instrumentation.

Thanks,
Swarup.

________________________________________
From: John Criswell [criswell at illinois.edu]
Sent: Tuesday, January 22, 2013 10:29 AM
To: Silky Arora; llvmdev at cs.uiuc.edu; Sahoo, Swarup Kumar
Subject: Re: [LLVMdev] Dynamic Profiling - Instrumentation basic query

On 1/13/13 11:06 PM, Criswell, John T wrote:
> There is code that does this for older versions of LLVM.  I believe it is in the giri project in the LLVM SVN repository.  I can look into more details when I get back from vacation. Swarup may also be able to provide information on the giri code.

I took a quick look, and the dynamic slicing code doesn't appear to be
checked into the giri project yet like I had originally thought.

We can, however, give you a copy of the code if you would like. However,
having looked at other emails in the thread, I'm not sure if it's what
you want.  Our dynamic slicing code only instruments LLVM IR loads and
stores; it does not instrument memory accesses caused by stack spill
slots, function argument setup, etc. (these are only visible at the code
generation IR level).

If instrumenting LLVM IR loads and stores suffices, and if you'd like a
copy of our code, please let me know.

-- John T.


>
> -- John T.
>
> ________________________________________
> From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] on behalf of Silky Arora [silkyar at umich.edu]
> Sent: Saturday, January 12, 2013 10:28 PM
> To: llvmdev at cs.uiuc.edu
> Subject: [LLVMdev] Dynamic Profiling - Instrumentation basic query
>
> Hi,
>
> I am new to LLVM, and would like to write a dynamic profiler, say which prints out the load address of all the load instructions encountered in a program.
>  From what I could pick up, edge-profiler.cpp increments a counter dynamically which is somehow dumped onto llvmprof.out by profile.pl
>
> Could anyone explain me how this works? Can I instrument the code to dump out the load addresses or other such information to a file?
>
> Thanks!
>
>
>
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