[llvm-dev] Adding custom callback function before/after passes

[Juneyoung Lee via llvm-dev]

Hello Fedor.

Thank you for the information.
I made a simple patch that exposes PassInstrumentationCallback so
llvmGetPassPluginInfo can use it: https://reviews.llvm.org/D71086 . Would
this change make sense?

Thanks,
Juneyoung Lee

On Thu, Dec 12, 2019 at 12:44 AM Fedor Sergeev <fedor.sergeev at azul.com>
wrote:

>
>
> On 12/3/19 8:01 PM, Juneyoung Lee via llvm-dev wrote:
>
> Hello all,
>
> Is there a way to register callback that runs before/after passes?
> PassTimingInfo seems to do a similar thing by calling
> PassInstrumentationCallbacks::registerBeforePassCallback /
> registerAfterPassCallback, but it is hard-wired with
> StandardInstrumentations class.
>
> PassInstrumentation framework was introduced to the new PassManager
> specifically in mind with ability
> to register arbitrary callbacks and execute them as pass manager traverses
> through the pass pipeline.
>
> PassInstrumentationCallbacks are indeed the entity to register your
> callbacks into, before passing it to PassBuilder;
> You can check how it is being done in
> `llvm/tools/opt/NewPMDriver.cpp`llvm::runPassPipeline.
>
> StandardInstrumentations are just a few "standard" callbacks that provide
> "standard" functionality, like -print-after-all or -time-passes.
> StandardInstrumentations registers its individual instrumentations the
> same way you would register your own.
>
> Note, that PassInstrumentation is only supported in new pass manager (opt
> -passes=  or clang -fexperimental-new-pass-manager).
>
> regards,
>   Fedor.
>
>
> Do we have something similar to RegisterStandardPasses, so custom
> callbacks can be added from somewhere outside LLVM?
>
> Thanks,
> Juneyoung Lee
>
>
>
> _______________________________________________
> LLVM Developers mailing listllvm-dev at lists.llvm.orghttps://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>

-- 

Juneyoung Lee
Software Foundation Lab, Seoul National University
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