[LLVMdev] set line number debug info

[Abhirup Ghosh]

Thanks for the help.
I thought I'd solved the problem (setting the line number information in the
instruction metadata) by inserting my own function for setting line number
in llvm/Support/DebugLoc.h. I have added  a function setLine(unsigned) in
DebugLoc class. The function simply sets the LineCol variable as needed. But
there is a problem.

Whenever I'm checking the line number(calling getLine()) from the function
where I've called setLine(...) function, it returns the changed line number
but whenever I call the getLine() function from other functions then it is
returning the previous value not the changed. Is the change in the LineCol
variable is not permanent or is this variable not at all linked with the
debug information?

How can I set the line number information for the instructions?


Abhirup Ghosh
M. Tech
Department of Computer Science & Engg.
IIT, Bombay
email - abhirupju at gmail.com , abhirup at cse.iitb.ac.in
Contact - 9920735181


On Mon, Mar 14, 2011 at 1:45 PM, Frits van Bommel <fvbommel at gmail.com>wrote:

> On Mon, Mar 14, 2011 at 8:56 AM, Abhirup Ghosh <abhirupju at gmail.com>
> wrote:
> > Hi,
> >       I am new to LLVM infrastructure. Recently I am trying to set the
> debug
> > info for an instruction. The main aim is to set the source line number of
> an
> > instruction. Can anyone please show how to do that?
> >       I think  that setMetadata method in Instruction class is to be
> used.
> > But how do I create MDNode* consisting of desired source line number.
> Source
> > line number can be extracted from the instruction-debug-info using
> > getMetadata method and then using getLineNumber method from DILocation
> > class. Unfortunately DILocation class does not have any function like
> > setLinenumber.
>
> You may want to check out Instruction::setDebugLoc().
> llvm/Support/DebugLoc.h and llvm/Analysis/DIBuilder.h will likely be
> helpful as well.
>
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