How can I build new functions on the fly during optimization?

How can I build new functions on the fly during optimization?

[Gary Oblock]

I'm trying to build new functions on the fly during optimization.
For those of you that have not been following my previous questions,
this is structure reorganization optimization related. For example when
somebody frees an array of type fu, I'd like to build a new
function _reorg_free_fu which does the correct things for a
transformed array of type _reorg_fu.

I've run across uses of these:
  build_fn_decl
  gimple_build_call
However, I don't see any code going any further than that.

Anybody have any ideas about how I can accomplish the rest of
what I need to do? Note, I'll be doing this during LTRANS.

Thanks,

Gary Oblock

Re: How can I build new functions on the fly during optimization?

[Richard Biener]

On Thu, Sep 19, 2019 at 4:27 AM Gary Oblock <goblock@marvell.com> wrote:
>
> I'm trying to build new functions on the fly during optimization.
> For those of you that have not been following my previous questions,
> this is structure reorganization optimization related. For example when
> somebody frees an array of type fu, I'd like to build a new
> function _reorg_free_fu which does the correct things for a
> transformed array of type _reorg_fu.
>
> I've run across uses of these:
>   build_fn_decl
>   gimple_build_call
> However, I don't see any code going any further than that.
>
> Anybody have any ideas about how I can accomplish the rest of
> what I need to do? Note, I'll be doing this during LTRANS.

One of the few examples is cgraph_node::expand_thunk
where it builds a GIMPLE thunk.  The other is in ipa.c,
cgraph_build_static_cdtor_1 but using a GENERIC body.

Most others do sth like cloning an existing function or
moving part of the CFG to a new function.

Richard.

> Thanks,
>
> Gary Oblock