Re: [PATCH 06/17] perf probe: Add --range option to show a variable's location range

[Alexei Starovoitov]

On Thu, May 14, 2015 at 07:37:58PM -0300, Arnaldo Carvalho de Melo wrote:
> From: He Kuang <hekuang@xxxxxxxxxx>
> 
> It is not easy for users to get the accurate byte offset or the line
> number where a local variable can be probed.
> 
> With '--range' option, local variables in the scope of the probe point
> are showed with a byte offset range, and can be added according to this
> range information.
...
> +	while ((offset = dwarf_getlocations(
> +				&attr, offset, &base,
> +				&start, &end, &op, &nops)) > 0) {

dwarf_getlocations only exists in the new libdw, so perf stopped
building with libdw from ubuntu 12.04.
Yeah, it's old, but can we add a weak dwarf_getlocations(), so
that we don't need to force everyone upgrading elfutils/libdw
for that feature?

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