[llvm-dev] how to add createLowerSwitchPass to PassManager object?

[Taher via llvm-dev]

This is run on a function pass, specifically runOnFunction which only gives
you current function &F.

Where do you get current module &M from? Can you even run a lower switch
pass using the legacy pass manager system?

On Fri, Nov 12, 2021 at 5:09 PM Zhang <admin at mayuyu.io> wrote:

> Hi:
> As the message suggests, you'll need a PM for it.
> Something like the following would do:
>
> ```
> legacy::FunctionPassManager FPM(&M);;
> FPM.add(createLowerSwitchPass());
> FPM.run(Func)
> ```
>
>
> Zhang
>
>
> ------------------ Original ------------------
> *From: * "llvm-dev"<llvm-dev at lists.llvm.org>;
> *Date: * Sat, Nov 13, 2021 02:54 AM
> *To: * "llvm-dev"<llvm-dev at lists.llvm.org>;
> *Subject: * [llvm-dev] how to add createLowerSwitchPass to PassManager
> object?
>
> My pass crashes on the callsite of runOnFunction() as it calls GetAnalysis
> to LazyValue internally.
>
> FunctionPass* lower = createLowerSwitchPass();
> lower->runOnFunction(F);
>
> The crash log says: *Assertion failed: (Resolver && "Pass has not been
> inserted into a PassManager object!")*
>
> How do I get the PassManager object to add LowerSwitchPass? I can't happen
> to find the object anywhere. Can the legacy pass manager run lower passes
> in llvm14? Alternatively, is there another method I can use to create
> LowerSwitchPass with the new PassManager?
>
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