llvm dev - Oct 2013 - [LLVMdev] Setting called value for an indirect function call

Hello;

I am trying to clone some call instructions in the IR and then set the
call destination of those call instructions to my own library
functions that happens to have the same arguments and return types of
the original callee.

It works perfectly for direct calls using setCalledFunction().  But
when the function call is indirect, is there a way to set the callee?
Something like setCalledValue()?  How do I achieve this?

Any help will be appreciated, thanks a lot!

-- 
Arnamoy Bhattacharyya
Athabasca Hall 143
Department of Computing Science - University of Alberta
Edmonton, Alberta, Canada, T6G 2E8
587-710-7073

On 10/30/13 12:22 PM, Arnamoy Bhattacharyya wrote:
> Hello;
>
> I am trying to clone some call instructions in the IR and then set the
> call destination of those call instructions to my own library
> functions that happens to have the same arguments and return types of
> the original callee.
>
> It works perfectly for direct calls using setCalledFunction().  But
> when the function call is indirect, is there a way to set the callee?
> Something like setCalledValue()?  How do I achieve this?
>
> Any help will be appreciated, thanks a lot!
>
Try the setCalledFunction() method of CallInst.  Despite the name, it 
looks like it takes a generic Value *, which means it should be able to 
set the called function operand to either a Function * or to a computed, 
indirect value (e.g., a Value *).

-- John T.