[LLVMdev] Instruction for print

[tarun agrawal]

Just to be clear, I have to add a function name printf in the module with
no body. And I can call the function. This will automatically call the
printf function which is defined in the library.

Tarun Agrawal

On Wed, Feb 8, 2012 at 11:34 PM, John Criswell <criswell at illinois.edu>wrote:

>  On 2/8/12 11:55 AM, tarun agrawal wrote:
>
> Hi,
>
> I am trying to insert a instruction for printf or cout. My aim is to print
> a integer and a string value using that instruction, which are already
> there in the code.
> but I am not able to understand how to do it. Any help would be great help.
>
>
> You want to insert a call instruction that calls the printf function.
> You'll need to insert a Function for printf (with no body) if no printf
> function exists within the LLVM module you're transforming.
>
> So, the code will look something like:
>
> Function * F = M.getOrInsertFunction ("printf", ...);
> CallInst::Create (F, ...);
>
> Be sure to look at the doxygen docs for exact method names and which
> parameters go where; I've skipped over such details above.
>
> -- John T.
>
>
>
>
> Thanks and Regards,
> Tarun Agrawal
>
>
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