[LLVMdev] Conflicting passes?

[Chris Lattner]

On Tue, 2 May 2006, Domagoj D wrote:
> Why are these two passes conflicting: UnifyFunctionExitNodes and LowerSwitch?
>
> AU.addRequired(LowerSwitchID) works, so does AU.addRequired<unifyFunctionExitNodes>(),
> but the two together don't...
>
> opt: PassManagerT.h:387: void llvm::PassManagerT<Trait>::markPassUsed(const llvm::PassInfo*, llvm::Pass*) [with Trait = llvm::MTraits]: Assertion `getAnalysisOrNullUp(P) && dynamic_cast<ImmutablePass*>(getAnalysisOrNullUp(P)) && "Pass available but not found! " "Perhaps this is a module pass requiring a function pass?"' failed.
> opt((anonymous namespace)::PrintStackTrace()+0x18)[0x8706558]
> opt((anonymous namespace)::SignalHandler(int)+0xfe)[0x87067e0]
> and so on...

Because they invalidate each other.  Neither preserves the other.

-Chris

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