[llvm-dev] registering passes at the beginning/end of opt passes (new pass manager)

[Arthur Eubanks via llvm-dev]

Currently there isn't such a rewriter. Although I may want to create one so
we can mass migrate tests to use the `-passes=` form after the NPM switch.

On Mon, Dec 7, 2020 at 4:33 PM Juneyoung Lee <juneyoung.lee at sf.snu.ac.kr>
wrote:

> Is there a rewriter tool that converts input passes into a string with
> full adaptor stacks?
>
> It seems manually updating existing tests' passes to have full adaptor
> stack is a tricky job; it would be great if there is an automatic way of
> doing that.
>
> Thanks,
> Juneyoung
>
>
> On Tue, Dec 8, 2020 at 3:36 AM Arthur Eubanks <aeubanks at google.com> wrote:
>
>> You could always specify the full adaptor stack for loop passes, e.g.
>> "module(function(loop(unswitch<nontrivial>)))".
>>
>> Another option is to register your passes via the flags mentioned above
>> and run default<O0>, which should invoke all the registered callbacks.
>>
>> On Mon, Dec 7, 2020 at 2:47 AM Juneyoung Lee via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> Okay, I tried something like this:
>>>
>>> Given opt -passes='...', my bash script strips the quotes, puts
>>> module(mypass) at the begin/end, put quotes again, and runs it. mypass is a
>>> module-level pass.
>>>
>>> ex) Given opt -passes='sroa' , it emits opt
>>> -passes='module(mypass),sroa,module(mypass)'
>>>
>>> The emitted command seems working in this case, but I found that it
>>> breaks when loop-level passes are there:
>>>
>>> ex) Running opt
>>> -passes='module(mypass),loop(unswitch<nontrivial>),module(mypass)'
>>>  shows:
>>> build/bin/opt: invalid use of 'loop' pass as module pipeline
>>>
>>>
>>> Is there a way to correctly add 'mypass' to the begin/end of the passes
>>> regardless of the level of the pipeline?
>>>
>>> Thanks,
>>> Juneyoung
>>>
>>> On Fri, Dec 4, 2020 at 1:28 PM Juneyoung Lee <juneyoung.lee at sf.snu.ac.kr>
>>> wrote:
>>>
>>>> Hello all,
>>>>
>>>> Can I register passes at the beginning/end of opt passes (new pass
>>>> manager)?
>>>>
>>>> I found that
>>>> registerPipelineStartEPCallback/registerOptimizerLastEPCallback work
>>>> successfully for clang, but they don't fire when opt -passes="" is used.
>>>>
>>>> Thanks,
>>>> Juneyoung
>>>>
>>>>
>>>
>>> --
>>>
>>> Juneyoung Lee
>>> Software Foundation Lab, Seoul National University
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>
>
> --
>
> Juneyoung Lee
> Software Foundation Lab, Seoul National University
>
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