On Fri, Jan 18, 2019 at 10:33 AM Li Kun <hw.li...@huawei.com> wrote: > > > > 在 2019/1/18 16:52, Richard Biener 写道: > > On Fri, Jan 18, 2019 at 4:11 AM Li Kun <hw.li...@huawei.com> wrote: > >> I need to known which rtx is expanded from a specific CALL_EXPR, how > >> could i do ? > >> > >> Is INSN_LOCATION accurate enough ? > > No. There's no accurate way to do this so you have to invent something. > > Or start by explaining what you are wanting to do. > I'm trying to implement safestack as an pass after expand, so i have to > known where the > args are lying if the composite struct param passed by reference, and i > could move the arg to unsafe region. > I try to not interfere the procedure of expand_call, but i can't get the > accurate informations. > What i'm thinking about is to get the rtxs of CALL_EXPR, and to locate > the args reversely. > So is there any better way to make it ?
I fear the only appropriate place to do something like this is hooking into call expansion (expand_call). Richard. > > Thanks a lot! > > > > Richard. > > > >> -- > >> Best Regards > >> Li Kun > >> > > -- > Best Regards > Li Kun >
