[LLVMdev] Fetching the functions in C files (original) (raw)

Amir H. Ashouri amirhossein.ashouri at gmail.com
Tue Oct 21 16:41:30 PDT 2014

Thanks for the answer John.

I checked the llvm-extract and it works, but my concern is if the output of the extract could be saved as .ll instead of .bc. Sort of human-readable format so that I can parse it. Otherwise, it is better to parse the foo.ll file right away instead of using the extract tool.

Please correct me if I am wrong.

Thanks,

-Amir

On Tue, Oct 21, 2014 at 7:02 PM, John Criswell <jtcriswel at gmail.com> wrote:

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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