[llvm-dev] [Xray] Help with Xray

[Dean Michael Berris via llvm-dev]

On Mon, Jan 7, 2019 at 10:26 PM Dangeti Tharun kumar
<cs15mtech11002 at iith.ac.in> wrote:
>
>
>
> On Mon, Jan 7, 2019 at 3:21 PM Dean Michael Berris <dean.berris at gmail.com> wrote:
>>
>> On Mon, Jan 7, 2019 at 8:43 PM Dangeti Tharun kumar
>> <cs15mtech11002 at iith.ac.in> wrote:
>> >
>> > Hi Dean,
>> >
>> > I have tried with -instr-map-1 and -instr-map-2, it didn't work.
>> >
>>
>> Yeah, I'm looking through the code and it looks like we're always just
>> using the function id when we should be using the symbol name. Let me
>> land a patch to fix this.
>
>
> Thanks Dean.
>
>> > Is there a way to find the function name from the identifier?
>>
>> You can try this manually by using the `llvm-xray extract -symbolize`
>> tool to get a YAML file that maps the function id's to symbols, but
>> that's a roundabout way of doing it. Ideally the graph-diff tool
>> should just do it.
>>
> I have tried this strangely I got this error
>
> $> llvm-xray extract -symbolize xray-log.clang-8.*
>
> YAML:1:1: error: Got empty plain scalar
> llvm-xray: Cannot extract instrumentation map from 'xray-log.clang-8.*'
> Failed loading YAML document from 'xray-log.clang-8.*
>

Sorry, that was unclear -- you can extract the instrumentation map
from an XRay-instrumented binary, not the traces.

> but this is working
>
> llvm-xray convert xray-log.clang-8.* -instr_map=../avx/llvm/xray-build/bin/clang -output-format=yaml 1>out.yaml
>
> Am I missing anything?
>

Nope, my instructions were unclear. :)

I've uploaded a patch which should make this work -- if you're able to
build the tool(s) with the patch applied, then it would be great to
hear your feedback:

https://reviews.llvm.org/D56383

I'm going to need to come up with test-cases locally to ensure that
this doesn't regress (and that it works as expected) but it would have
to wait 'til tomorrow.

Cheers

-- 
Dean