[PATCH 3/5] perf tools: Update srcline/file if needed

[Namhyung Kim <namhyung@kernel.org>]

Normally the hist entry's srcline and/or srcfile is set during sorting.
However sometime it's possible to a hist entry's srcline is not set yet
after the sorting.  This is because the entry is so unique and other
sort keys already make it distinct.  Then the srcline/file sort didn't
have a chance to be called during the sorting.  In that case it has NULL
srcline/srcfile field and shows nothing.

Before:

  $ perf report -s comm,sym,srcline
  ...
  Overhead  Command       Symbol
  -----------------------------------------------------------------
    34.42%  swapper       [k] intel_idle          intel_idle.c:0
     2.44%  perf          [.] __poll_nocancel     (null)
     1.70%  gnome-shell   [k] fw_domains_get      (null)
     1.04%  Xorg          [k] sock_poll           (null)

After:

    34.42%  swapper       [k] intel_idle          intel_idle.c:0
     2.44%  perf          [.] __poll_nocancel     .:0
     1.70%  gnome-shell   [k] fw_domains_get      fw_domains_get+42
     1.04%  Xorg          [k] sock_poll           socket.c:0

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/sort.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 7daea71691df..6808d73164b5 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -315,6 +315,16 @@ sort__srcline_cmp(struct hist_entry *left, struct hist_entry *right)
 static int hist_entry__srcline_snprintf(struct hist_entry *he, char *bf,
 					size_t size, unsigned int width)
 {
+	if (!he->srcline) {
+		if (!he->ms.map)
+			he->srcline = SRCLINE_UNKNOWN;
+		else {
+			struct map *map = he->ms.map;
+			he->srcline = get_srcline(map->dso,
+					   map__rip_2objdump(map, he->ip),
+						  he->ms.sym, true);
+		}
+	}
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, he->srcline);
 }
 
@@ -368,6 +378,12 @@ sort__srcfile_cmp(struct hist_entry *left, struct hist_entry *right)
 static int hist_entry__srcfile_snprintf(struct hist_entry *he, char *bf,
 					size_t size, unsigned int width)
 {
+	if (!he->srcfile) {
+		if (!he->ms.map)
+			he->srcfile = no_srcfile;
+		else
+			he->srcfile = get_srcfile(he);
+	}
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, he->srcfile);
 }
 
-- 
2.7.1