[LLVMdev] Modifying debug information through llvm pass

[Riyad Parvez]

On 05/15/2015 05:21 PM, Adrian Prantl wrote:
>> 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?

Thanks for pointing that out. It worked.

Thanks
Riyad
> -- 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
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev