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

[Fedor Sergeev via llvm-dev]

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
>
>
>
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