perf annotate: Add call target name if it is missing

The /proc/kcore file has no symbols, so the call target name does not
display.  Fix by looking up the symbol name if it is on the same map.

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375875537-4509-14-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 646e38dad01b..bfc5a27597d6 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -825,6 +825,22 @@ static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
                 dl->ops.target.offset = dl->ops.target.addr -
                                         map__rip_2objdump(map, sym->start);
 
+        /*
+         * kcore has no symbols, so add the call target name if it is on the
+         * same map.
+         */
+        if (dl->ins && ins__is_call(dl->ins) && !dl->ops.target.name) {
+                struct symbol *s;
+                u64 ip = dl->ops.target.addr;
+
+                if (ip >= map->start && ip <= map->end) {
+                        ip = map->map_ip(map, ip);
+                        s = map__find_symbol(map, ip, NULL);
+                        if (s && s->start == ip)
+                                dl->ops.target.name = strdup(s->name);
+                }
+        }
+
         disasm__add(&notes->src->source, dl);
 
         return 0;