[LLVMdev] Mutating the elements of a ConstantArray

[Chris Lattner]

On Mar 31, 2009, at 4:42 PM, Nick Johnson wrote:

> Hello,
>
> I need to append something to the global "llvm.global_ctors".  This
> variable may or may not already be declared within the current module.
>
> If I lookup the global variable, I see that it supports a
> getOperand(i) and setOperand(i,c), but does not support any way that I
> can enlarge that array to add a new record.

Hi Nick,

You actually have to create a new ConstantArray with the desired  
elements, then remove the existing llvm.global_ctors constand and  
create a new one to replace it.

Take a look at the GlobalOpt pass for examples of how to do this sort  
of thing.

-Chris