[llvm-dev] Example of using RGPassManager?

[Zhang via llvm-dev]

Thanks. I ended up directly using legacy::PassManager which worked for me


Zhang
 
 
------------------ Original ------------------
From:  "Michael Kruse"<llvmdev at meinersbur.de>;
Date:  Fri, Feb 19, 2021 02:07 PM
To:  "Zhang"<admin at mayuyu.io>; 
Cc:  "llvm-dev"<llvm-dev at lists.llvm.org>; 
Subject:  Re: [llvm-dev] Example of using RGPassManager?

 

Probably it's because RegionPrinterPass also depends on a FunctionPass
analysis, such as DominatorTree. Try creating a function pass and
adding createRegionPrinterPass() to it, it will create the
RGPassManager for you.

Michael

Am Do., 18. Feb. 2021 um 22:33 Uhr schrieb Zhang via llvm-dev
<llvm-dev at lists.llvm.org>:
>
> Hi:
> My pass needs to run on LLVM Regions, I'm currently using the following code
> ```
> RGPassManager RPM;
> RPM.add(createRegionPrinterPass());
> RPM.doInitialization(M);
> for (Function &func : M.functions()) {
>   RPM.runOnFunction(func);
> }
> RPM.doFinalization(M);
> ```
>
> However when adding the pass, it asserts with PMTopLevelManager::findAnalysisUsage due to top level pass manager is null
>
> Zhang
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> llvm-dev at lists.llvm.org
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