[LLVMdev] Problem getting LoopInfo inside non-LoopPass

[John Criswell]

On 11/10/11 11:06 AM, Ryan Taylor wrote:
> LLVMers,
>
>    I am doing a CallGraphPass but would like to get the LoopInfo of 
> the functions inside this pass, is this possible? Currently I have a 
> function inside the CallGraph struct:
>
>     void getAnalysisUsage(AnalysisUsage &AU) const {
>         AU.addRequired<LoopInfo>();
>         AU.addPreserved<LoopInfo>();
>     }
>
> And later inside the pass I am calling:
>
> LoopInfo &LI = getAnalysis<LoopInfo>();
>
> I have also tried to pass the Function pointer to getAnalysis but that 
> doesn't work either. With the above code my error is:

1) You may need to pass a Function pointer or reference if your pass is 
not a FunctionPass (e.g., if it is a ModulePass).

2) If you have to specify a Function pointer or reference, you need to 
make sure that the Function is *not* a declaration:

if (!(F->getDeclaration()))
     getAnalysis<LoopInfo>(F);

-- John T.

>
> UNREACHABLE executed!
> 0  opt             0x00000000008edc2f
> 1  opt             0x00000000008edfda
> 2  libpthread.so.0 0x00007f9c8e69bc60
> 3  libc.so.6       0x00007f9c8d986d05 gsignal + 53
> 4  libc.so.6       0x00007f9c8d98aab6 abort + 390
> 5  opt             0x00000000008da974 
> llvm::llvm_unreachable_internal(char const*, char const*, unsigned 
> int) + 356
> 6  opt             0x000000000087e046
> 7  opt             0x0000000000882b45 
> llvm::PMDataManager::add(llvm::Pass*, bool) + 741
> 8  opt             0x000000000087f413 
> llvm::PassManager::add(llvm::Pass*) + 259
> 9  opt             0x00000000004ab9be main + 2174
> 10 libc.so.6       0x00007f9c8d971eff __libc_start_main + 255
> 11 opt             0x000000000049f5f9
> Stack dump:
>
>
> Any help would be appreciated, thanks!
>
>
>
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