[llvm-dev] Debugging LLVM IR - Reviving the DebugIR pass

[Siddharth Bhat via llvm-dev]

> I removed the pass because it wasn't maintained and the cost of keeping
it up to date was more than the benefit, so a few questions:

> a) Are you planning on maintaining this?
Yes, I do plan on maintaining this.


> b) Are you going to be doing active work on it?
I do plan on writing additional tests, and maybe adding support for
variables as described in the kaleidoscope docs, yes.


> c) What's the benefit here? What use case?
At least for me, the use case is when you have a miscompile from your
frontend. It's easier to think about things on a LLVM IR level than on the
assembly (at least for me). So, I prefer to have the ability to step
through the LLVM IR in a debugger.

> Are you finding it hard to get a review on the patch?
Yes, I am.

Thanks a lot,
~Siddharth

On Mon, 20 Nov 2017 at 23:57 Eric Christopher <echristo at gmail.com> wrote:

> On Mon, Nov 20, 2017 at 2:32 AM Siddharth Bhat via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hello all,
>>
>> I recently felt the need to have debug info at the LLVM IR level (because
>> my frontend's semantics vastly differ from IR that it doesn't make much
>> sense to use it). Asm can sometimes be too "low level", so it's nice to
>> have the ability to single-step at the IR level.
>>
>> The pass that used to do this (-debugir) bitrotted and was removed from
>> tree. I spent the weekend bringing it back:
>> https://reviews.llvm.org/D40207
>>
>>
> I removed the pass because it wasn't maintained and the cost of keeping it
> up to date was more than the benefit, so a few questions:
>
> a) Are you planning on maintaining this?
> b) Are you going to be doing active work on it?
> c) What's the benefit here? What use case?
>
>
>> I'd love to have some help with reviews and tests I should write for
>> this, because I don't understand the debug info side of LLVM very well.
>>
>> Also, is there a protocol to have a review be put on the "review corner"?
>> I'd be glad if this patch could be listed there :)
>>
>>
> Are you finding it hard to get a review on the patch?
>
> -eric
>
-- 
Sending this from my phone, please excuse any typos!
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