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

[David Blaikie]

On Wed, Oct 15, 2014 at 9:04 AM, Adrian Prantl <aprantl at apple.com> wrote:

> 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.
>

Perhaps this should be built into DIBuilder, but I'm not sure.

Yeah, looking at how it's implemented, this isn't ideal - we've got the
string "Debug Info Version" written in Clang and in LLVM, not using a
shared constant or common utility functions owned in the same place. This
should probably be part of DIBuilder in some way or another so that clients
don't have to duplicate this string, etc.

- David


>
> -- 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> wrote:
>
>
>
> On Wed, Oct 15, 2014 at 7:08 AM, Muneeb Khan <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
>>
>>
>>
>>
>> _______________________________________________
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>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>>
>>
>
>
> Muneeb Khan
> PhD student
> Department of Information Technology,
> Uppsala University,
> Sweden
> Tel: +46 18 - 471 1049
>
>
>
>
>
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