llvm dev - Dec 2020 - Creating an instance of new pass manager in tool

Hello

I am writing a tool within an external project, and I need to use an instance of
the new pass manager to invoke LLVM analyses. It used to be possible to create
an initialized instance of the legacy::FunctionPassManager by providing the
Module to the constructor. I was unable to find a corresponding way to
initialize an instance of the new FunctionAnalysisManager. When I tried to
construct an instance of FunctionAnalysisManager and use it, none of the passes
were registered and I found myself having to register every single LLVM pass,
even if it is not directly invoked by my tool (which is not feasible). What is
the correct way to do this?

Thanks
-Adel Ejjeh
--
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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Looking at the existing users of the new pass manager may be useful. See
BackendUtil.cpp for how Clang sets up the new pass manager, and
NewPMDriver.cpp for how opt sets it up.

There should be no need to initialize individual passes, although you can
inject your own analyses (e.g. alias analysis).

On Thu, Dec 3, 2020 at 9:21 AM Ejjeh, Adel via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hello
>
>
>
> I am writing a tool within an external project, and I need to use an
> instance of the new pass manager to invoke LLVM analyses. It used to be
> possible to create an initialized instance of the
> legacy::FunctionPassManager by providing the Module to the constructor. I
> was unable to find a corresponding way to initialize an instance of the new
> FunctionAnalysisManager. When I tried to construct an instance of
> FunctionAnalysisManager and use it, none of the passes were registered and
> I found myself having to register every single LLVM pass, even if it is not
> directly invoked by my tool (which is not feasible). What is the correct
> way to do this?
>
>
>
> Thanks
>
> -Adel Ejjeh
>
> --
>
> 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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This example of a stand-alone tool in llvm-tutor might be helpful: 
https://github.com/banach-space/llvm-tutor/blob/master/tools/StaticMain.cpp#L52-L57

I've not played with it much myself, so you may discover that it's too 
basic :)

-Andrzej

On 03/12/2020 17:21, Ejjeh, Adel via llvm-dev wrote:
> Hello
> 
> I am writing a tool within an external project, and I need to use an 
> instance of the new pass manager to invoke LLVM analyses. It used to be 
> possible to create an initialized instance of the 
> legacy::FunctionPassManager by providing the Module to the constructor. 
> I was unable to find a corresponding way to initialize an instance of 
> the new FunctionAnalysisManager. When I tried to construct an instance 
> of FunctionAnalysisManager and use it, none of the passes were 
> registered and I found myself having to register every single LLVM pass, 
> even if it is not directly invoked by my tool (which is not feasible). 
> What is the correct way to do this?
> 
> Thanks
> 
> -Adel Ejjeh
> 
> -- 
> 
> 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 
> <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
>