llvm dev - Nov 2020 - Accessing Function analyses in a Module pass with the new pass manager

Hello

With the legacy pass manager, we could invoke a Function Pass within the
runOnModule() of a Module Pass by simply passing the Function reference to the
getAnalysis<>() method. Can the same be achieved using the new Pass
Manager? I am writing a Module Pass which requires to access analyses for the
different functions, and I need the new pass manager because I need different
copies of the same analysis to be valid at the same time, for different
functions in the module (my understanding was that the new pass manager can do
that whereas the legacy pass manager would only keep the last instance that was
invoked).

Thanks
-Adel
--
Adel Ejjeh
PhD Candidate | Computer Science
University of Illinois at Urbana Champaign
Email: aejjeh at illinois.edu<mailto:aejjeh at illinois.edu> | adel.ejjeh
at gmail.com<mailto:adel.ejjeh at gmail.com>
Zoom: https://illinois.zoom.us/my/aejjeh

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You shouldn't be running a non-analysis pass from another pass, and the NPM
doesn't allow for that. If you want to do some transforms, use some utility
function. For example, use SplitAllCriticalEdges() instead of running
BreakCriticalEdgesPass.

Does that answer your question? What exactly are you trying to do?

On Wed, Nov 11, 2020 at 7:45 AM Ejjeh, Adel via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hello
>
>
>
> With the legacy pass manager, we could invoke a Function Pass within the
> runOnModule() of a Module Pass by simply passing the Function reference to
> the getAnalysis<>() method. Can the same be achieved using the new
Pass
> Manager? I am writing a Module Pass which requires to access analyses for
> the different functions, and I need the new pass manager because I need
> different copies of the same analysis to be valid at the same time, for
> different functions in the module (my understanding was that the new pass
> manager can do that whereas the legacy pass manager would only keep the
> last instance that was invoked).
>
>
>
> Thanks
>
> -Adel
>
> --
>
> Adel Ejjeh
>
> PhD Candidate | Computer Science
>
> University of Illinois at Urbana Champaign
>
> Email: aejjeh at illinois.edu | adel.ejjeh at gmail.com
>
> Zoom: https://illinois.zoom.us/my/aejjeh
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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