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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(original) (raw)

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