[LLVMdev] using -debug-ir to map identify IR mapping

[Adrian Prantl]

I have no experience with debug-ir, but is it possible that the debug-ir pass never sets the debug info version? There should be a named metadata node 
  !llvm.module.flags = !{..., !123}
  !123 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
in the .ll output. If it is missing, just have a look at the clang sources for an example how to add a module flag.

-- adrian


> On Oct 15, 2014, at 8:20 AM, Muneeb Khan <muneeb.khan at it.uu.se> wrote:
> 
> Yes, I am using opt and llc from the same version (3.5).
> I know that there were issues with debug-ir in 3.4. I have explored the source tree myself for 3.5 and I know that the pass -debug-ir does kick in with opt.
> But I have no clue of what happens with the debug information in (and after) the llc pass.
> 
> /Muneeb
> 
> On 15 Oct 2014, at 17:14, David Blaikie <dblaikie at gmail.com <mailto:dblaikie at gmail.com>> wrote:
> 
>> 
>> 
>> On Wed, Oct 15, 2014 at 7:08 AM, Muneeb Khan <muneeb.khan at it.uu.se <mailto:muneeb.khan at it.uu.se>> wrote:
>> Hi,
>> I am using the -debug-ir pass in LLVM-3.5 opt tool to map binary information back to the IR instead of the source files.
>> I use the opt tool to  generate a .ll file. But when I run the llc tool on it to generate an assembly (or object) file, it gives me the following warning
>> 
>> warning: ignoring debug info with an invalid version (0) in 
>> 
>> Are you using opt and llc from the same LLVM version? (mixing and matching could produce this problem)
>> 
>> Or possibly debug-ir was never updated to produce the dubug info version - Adrian?
>>  
>> 
>> How can I use the debug-ir functionality to achieve a mapping from the binary to the IR?
>> Thanks!
>> 
>> Muneeb Khan
>> PhD student
>> Department of Information Technology,
>> Uppsala University,
>> Sweden
>> Tel: +46 18 - 471 1049 <tel:%2B46%2018%20-%20471%201049>
>> 
>> 
>> 
>> 
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>> 
>> 
> 
> 
> Muneeb Khan
> PhD student
> Department of Information Technology,
> Uppsala University,
> Sweden
> Tel: +46 18 - 471 1049
> 
> 
> 

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