[LLVMdev] Fetching the functions in C files

John Criswell
2014-10-21T23:02:46Z

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
tool.

Regards,

John Criswell

>
> Regards,
>
> -Amir
>
>
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--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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