[LLVMdev] Fetching the functions in C files

John Criswell jtcriswel at gmail.com
Tue Oct 21 16:02:46 PDT 2014

On 10/21/14, 5:27 PM, Amir H. Ashouri wrote:
> Hello Everyone,
> Just subscribed to the mailing list.
> I was wondering how I am going to fetch each functions of a specific 
> source code file (c/c++) using the LLVM framework. For instance, I 
> would like to apply certain passes using llvm-opt on certain functions 
> not the whole file.
> I would appreciate any hints or idea leading me about the starting point.

You might be able to use the llvm-extract tool to pull out the functions 
you want into a separate bitcode file and then use opt to optimize 
them.  You'd then need to create a second bitcode file that contains the 
remaining functions (using llvm-extract again). Finally, you'd take the 
optimized bitcode file and the bitcode file containing the other 
functions and link them together using clang and libLTO or the llvm-link 


John Criswell

> Regards,
> -Amir
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John Criswell
Assistant Professor
Department of Computer Science, University of Rochester

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