[LLVMdev] Modifying debug information through llvm pass

[Adrian Prantl]

> On May 12, 2015, at 7:59 PM, Riyad Parvez <riyad.parvez at uwaterloo.ca> wrote:
> 
> Hi All,
> 
> I want to change debug information of an llvm instruction so that the modified debug info is subsequently passed to executable binary. So if I use "addr2line" utility on the binary, it will return my modified debug information. 
> 
> I've tried to change by using the following code snippet:
> 
> MDNode *N = Inst->getMetadata("dbg");
> DebugLoc Loc = DebugLoc::get(newLine, newCol, N);
Your use of N looks sketchy here. The third argument of DebugLoc::get() is supposed to be the scope of the location, so you probably want
  Inst->getDebugLoc().getScope()
there?

-- adrian
  
> Inst->getDebugLoc();
> Inst->setDebugLoc(Loc);
> I read the DebugLoc back by using
> const DebugLoc D = Inst->getDebugLoc();
> unsigned Line = D.getLine(); 
> outs() << Line <<"\n"; 
> But I can't set the debug info correctly. How can I change the debug info correctly through llvm pass?
> 
> Thanks
> Riyad
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