[LLVMdev] Inserting comments

Devang Patel dpatel at apple.com
Tue Nov 4 09:39:46 PST 2008

On Nov 4, 2008, at 12:57 AM, Scott Graham wrote:

> Hi
> Anyone have any clever way of inserting a comment (or
> comment-ish-thing) that will make it to an .ll that's generated at the
> same time as writing out the bitcode?
> I'd been hacking comments in using an alloca with the name of the
> value being the comment, but just realized that they weren't getting
> removed at the codegen level despite being unused (no opt), when I got
> a stack overflow due to having them in a loop.
> I tried a no-op bitcast, but that gets removed too early, and doesn't
> make to the .ll. I don't especially care if they disappear after
> running passes, just that they survive long enough to see them in a
> dump(), and that they don't affect the program behaviour.

Try using llvm.var.annotation intrinsic.

> thanks,
> scott
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