[PATCH v4 1/2] perf util: Print al_addr when symbol is not found

[Jin Yao]

For branch mode, if the symbol is not found, it prints
the address.

For example, 0x0000555eee0365a0 in below output.

Overhead  Command  Source Shared Object  Source Symbol                            Target Symbol
  17.55%  div      libc-2.27.so          [.] __random                             [.] __random
   6.11%  div      div                   [.] 0x0000555eee0365a0                   [.] rand
   6.10%  div      libc-2.27.so          [.] rand                                 [.] 0x0000555eee036769
   5.80%  div      libc-2.27.so          [.] __random_r                           [.] __random
   5.72%  div      libc-2.27.so          [.] __random                             [.] __random_r
   5.62%  div      libc-2.27.so          [.] __random_r                           [.] __random_r
   5.38%  div      libc-2.27.so          [.] __random                             [.] rand
   4.56%  div      libc-2.27.so          [.] __random                             [.] __random
   4.49%  div      div                   [.] 0x0000555eee036779                   [.] 0x0000555eee0365ff
   4.25%  div      div                   [.] 0x0000555eee0365fa                   [.] 0x0000555eee036760

But it's not very easy to understand what the instructions
are in the binary. So this patch uses the al_addr instead.

With this patch, the output is

Overhead  Command  Source Shared Object  Source Symbol                            Target Symbol
  17.55%  div      libc-2.27.so          [.] __random                             [.] __random
   6.11%  div      div                   [.] 0x00000000000005a0                   [.] rand
   6.10%  div      libc-2.27.so          [.] rand                                 [.] 0x0000000000000769
   5.80%  div      libc-2.27.so          [.] __random_r                           [.] __random
   5.72%  div      libc-2.27.so          [.] __random                             [.] __random_r
   5.62%  div      libc-2.27.so          [.] __random_r                           [.] __random_r
   5.38%  div      libc-2.27.so          [.] __random                             [.] rand
   4.56%  div      libc-2.27.so          [.] __random                             [.] __random
   4.49%  div      div                   [.] 0x0000000000000779                   [.] 0x00000000000005ff
   4.25%  div      div                   [.] 0x00000000000005fa                   [.] 0x0000000000000760

Now we can use objdump to dump the object starting from 0x5a0.

For example,
objdump -d --start-address 0x5a0 div

00000000000005a0 <rand@plt>:
 5a0:   ff 25 2a 0a 20 00       jmpq   *0x200a2a(%rip)        # 200fd0 <__cxa_finalize@plt+0x200a20>
 5a6:   68 02 00 00 00          pushq  $0x2
 5ab:   e9 c0 ff ff ff          jmpq   570 <srand@plt-0x10>
 ...

 v2:
 ---
 No change

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
 tools/perf/util/sort.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index ab0cfd790ad0..e860595576c2 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -869,7 +869,8 @@ static int hist_entry__sym_from_snprintf(struct hist_entry *he, char *bf,
 	if (he->branch_info) {
 		struct addr_map_symbol *from = &he->branch_info->from;
 
-		return _hist_entry__sym_snprintf(&from->ms, from->addr, he->level, bf, size, width);
+		return _hist_entry__sym_snprintf(&from->ms, from->al_addr,
+						 he->level, bf, size, width);
 	}
 
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, "N/A");
@@ -881,7 +882,8 @@ static int hist_entry__sym_to_snprintf(struct hist_entry *he, char *bf,
 	if (he->branch_info) {
 		struct addr_map_symbol *to = &he->branch_info->to;
 
-		return _hist_entry__sym_snprintf(&to->ms, to->addr, he->level, bf, size, width);
+		return _hist_entry__sym_snprintf(&to->ms, to->al_addr,
+						 he->level, bf, size, width);
 	}
 
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, "N/A");
-- 
2.17.1