[LLVMdev] Fetching the functions in C files

Amir H. Ashouri
2014-10-22T00:22:49Z

Thanks Markus.

Having llvm-as to turn the extracted function.bc file to .ll caused an
error saying:

*llvm-as-3.4: function_bc:1:1: error: expected top-level entity*

*BC! #AI29bEBB2I (some more binary)*

This error is just the same error that I received while using llvm-extract
on a .c file (not .bc or .ll).


Do I have to include other things in the command ? I mean generating a
function.ll without anything as header, Module ID, etc might be wrong.
right ?


-Amir

On Tue, Oct 21, 2014 at 7:51 PM, Markus Timpl <tima0900 at googlemail.com>
wrote:

> You can use llvm-dis to turn .bc files into .ll files.
> Am 22.10.2014 01:44 schrieb "Amir H. Ashouri" <
> amirhossein.ashouri at gmail.com>:
>
> 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
>>>
>>>
>>> _______________________________________________
>>> LLVM Developers mailing listLLVMdev at cs.uiuc.edu
http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>
>>>
>>> --
>>> John Criswell
>>> Assistant Professor
>>> Department of Computer Science, University of
Rochesterhttp://www.cs.rochester.edu/u/criswell
>>>
>>>
>>
>> _______________________________________________
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>>
>>
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