On Fri, 16 Aug 2024 16:58:32 -0700
Namhyung Kim <namhyung@kernel.org> wrote:
> The location list will have entries with half-open addressing like
> [start, end) which means it doesn't include the end address. So it
> should skip entries at the end address and match to the next entry.
>
> An example location list looks like this:
>
> 00237876 ffffffff8110d32b (base address)
> 0023787f v000000000000000 v000000000000002 views at 00237868 for:
> ffffffff8110d32b ffffffff8110d4eb (DW_OP_reg3 (rbx)) <<<--- 1
> 00237885 v000000000000002 v000000000000000 views at 0023786a for:
> ffffffff8110d4eb ffffffff8110d50b (DW_OP_reg14 (r14)) <<<--- 2
> 0023788c v000000000000000 v000000000000001 views at 0023786c for:
> ffffffff8110d50b ffffffff8110d7c4 (DW_OP_reg3 (rbx))
> 00237893 v000000000000000 v000000000000000 views at 0023786e for:
> ffffffff8110d806 ffffffff8110d854 (DW_OP_reg3 (rbx))
> 0023789a v000000000000000 v000000000000000 views at 00237870 for:
> ffffffff8110d876 ffffffff8110d88e (DW_OP_reg3 (rbx))
>
> The first entry at 0023787f has [8110d32b, 8110d4eb) (omitting the
> ffffffff at the beginning), and the second one has [8110d4eb, 8110d50b).
>
Looks good to me.
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Thanks!
> Fixes: 2bc3cf575a16 ("perf annotate-data: Improve debug message with location info")
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
> tools/perf/util/annotate-data.c | 2 +-
> tools/perf/util/dwarf-aux.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
> index ff85d190e3ac..fd8d3cdead5a 100644
> --- a/tools/perf/util/annotate-data.c
> +++ b/tools/perf/util/annotate-data.c
> @@ -95,7 +95,7 @@ static void pr_debug_location(Dwarf_Die *die, u64 pc, int reg)
> return;
>
> while ((off = dwarf_getlocations(&attr, off, &base, &start, &end, &ops, &nops)) > 0) {
> - if (reg != DWARF_REG_PC && end < pc)
> + if (reg != DWARF_REG_PC && end <= pc)
> continue;
> if (reg != DWARF_REG_PC && start > pc)
> break;
> diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> index beb632153a74..0151a8d14350 100644
> --- a/tools/perf/util/dwarf-aux.c
> +++ b/tools/perf/util/dwarf-aux.c
> @@ -1444,7 +1444,7 @@ static int __die_find_var_reg_cb(Dwarf_Die *die_mem, void *arg)
>
> while ((off = dwarf_getlocations(&attr, off, &base, &start, &end, &ops, &nops)) > 0) {
> /* Assuming the location list is sorted by address */
> - if (end < data->pc)
> + if (end <= data->pc)
> continue;
> if (start > data->pc)
> break;
> --
> 2.46.0.184.g6999bdac58-goog
>
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>