[LLVMdev] Pulling line number/file/path information from DbgStopPointInst instructions

[Török Edwin]

On 2009-04-30 04:43, Sarah Thompson wrote:
> Hmm... if I do a print() on the result of getFileName(), I get
>
> 	i8 * getelementptr ([9 x i8]* @.str, i32 0, i32 0)
>
> back, but if I try to dyn_cast this to GetElementPtrInst it fails  
> (returning null), so presumably I'm seeing a  
> GetElementPtrConstantExpr... so how can I get at that constant i8  
> array without casting to a GetElementPtrInst, and with  
> GetElementPtrConstantExpr being inaccessible to user code?
>   

Look at lib/Analysis/DbgInfoPrinter.cpp in trunk:

void PrintDbgInfo::printStopPoint(const DbgStopPointInst *DSI)
{
  if (PrintDirectory) {
    std::string dir;
        GetConstantStringInfo(DSI->getDirectory(), dir);
    Out << dir << "/";
  }
  std::string file;
  GetConstantStringInfo(DSI->getFileName(), file);
  Out << file << ":" << DSI->getLine();
  if (unsigned Col = DSI->getColumn()) {
    Out << ":" << Col;
  }
}

There are also some helpers for finding the stoppoints in the same class.

Best regards,
---Edwin