Some beginner's questions concerning doing instrumentation/analysis in GIMPLE

[Richard Biener]

On Thu, Jan 10, 2019 at 3:00 PM Carter Cheng <cartercheng@gmail.com> wrote:
>
> Hello,
>
> I am trying to assess an idea and whether it is possible to implement a
> certain idea as a gcc plugin. I look over some of the information on the
> web and the gcc internals documentation but I cannot still figure out some
> basic things concerning manipulating GIMPLE in a plugin.
>
> 1) How does one add and safely remove basic blocks in GIMPLE if one is
> trying to transform a function?
>
> 2) How does one label a basic block with a new label (for conditional
> branches)?
>
> 3) How does one do the same for functions (like in situations when one is
> doing interprocedural analysis and function cloning)?
>
> I apologize if this is in a tutorial somewhere but I could not find it.

Your questions are a bit broad and thus hard to answer in a short e-mail.
I suggest you look at tree-call-cdce.c which creates new control-flow
on GIMPLE.

For more specific questions please shortly elaborate on what you are
intending to do IL-wise.

Richard.

> Regards,
>
> Carter.