llvm dev - Apr 2007 - [LLVMdev] Pass management

Dear guys,

     I need help fixing a little piece of code. I have a pass that I really 
want to execute after the TwoAddressinstructionPass. But if I write 
"AU.addRequiredID(TwoAddressInstructionPassID);" in my pass' 
getAnalysisUsage, I end up getting the infamous:


PassManagerT.h:387: failed assertion `getAnalysisOrNullUp(P) && 
dynamic_cast<ImmutablePass*>(getAnalysisOrNullUp(P)) && "Pass
available
but not found! " "Perhaps this is a module pass requiring a function 
pass?"'


Well, without requiring TwoAddressPass, LLVM's pass manager schedules my 
pass to run before TwoAddress, and, because TwoAddress does not preserve 
it, the pass manager call my pass again. That is what I want to avoid. I 
wish I could require TwoAddress in my pass. Could someone tell me how to 
avoid that error message? My getAnalysis method is:


void DefUseSites_Fer::getAnalysisUsage(AnalysisUsage &AU) const {
     AU.addRequired<LoopInfo>();
//    AU.addRequiredID(TwoAddressInstructionPassID);
     AU.addRequired<SplitPhiGroups_Fer>();
     AU.setPreservesAll();
}


Thanks a lot,

Fernando

On Apr 7, 2007, at 3:16 PM, Fernando Magno Quintao Pereira wrote:
>
> Dear guys,
>
>      I need help fixing a little piece of code. I have a pass that  
> I really
> want to execute after the TwoAddressinstructionPass. But if I write
> "AU.addRequiredID(TwoAddressInstructionPassID);" in my pass'
> getAnalysisUsage, I end up getting the infamous:
May be the error message is correct ? Did you check ?
> PassManagerT.h:387: failed assertion `getAnalysisOrNullUp(P) &&
> dynamic_cast<ImmutablePass*>(getAnalysisOrNullUp(P)) &&
"Pass
> available
> but not found! " "Perhaps this is a module pass requiring a
function
> pass?"'
Note, you are using old pass manager, which is completely rewritten
in current CVS sources.

> Well, without requiring TwoAddressPass, LLVM's pass manager  
> schedules my
> pass to run before TwoAddress, and, because TwoAddress does not  
> preserve
> it, the pass manager call my pass again. That is what I want to avoid.
However, use command line option -debug-pass=Details to understand  
why certain pass is preserved or not and who requires what etc...

-
Devang
> I
> wish I could require TwoAddress in my pass. Could someone tell me  
> how to
> avoid that error message? My getAnalysis method is:
>
>
> void DefUseSites_Fer::getAnalysisUsage(AnalysisUsage &AU) const {
>      AU.addRequired<LoopInfo>();
> //    AU.addRequiredID(TwoAddressInstructionPassID);
>      AU.addRequired<SplitPhiGroups_Fer>();
>      AU.setPreservesAll();
> }
>
>
> Thanks a lot,