llvm dev - Feb 2021 - Example of using RGPassManager?

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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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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