Re: [PATCH 31/48] perf dwarf-aux: Add die_get_cfa()

[Namhyung Kim <namhyung@xxxxxxxxxx>]

On Mon, Nov 6, 2023 at 4:50 PM Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>
> On Wed, 11 Oct 2023 20:50:54 -0700
> Namhyung Kim <namhyung@xxxxxxxxxx> wrote:
>
> > The die_get_cfa() is to get frame base register and offset at the given
> > instruction address (pc).  This info will be used to locate stack
> > variables which have location expression using DW_OP_fbreg.
> >
>
> In the util/probe-finder.c, I added the elfutils version checker
>
> #if _ELFUTILS_PREREQ(0, 142)
>
> for CFI related code, in commit 7752f1b096e1 ("perf probe: Don't
>  compile CFI related code if elfutils is old"). Maybe we'd better to have
> a config of HAVE_DWARF_CFI_SUPPORT for this.

Sounds like a good idea.  Will add.

Thanks,
Namhyung