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Subject[PATCH 2/2] perf top: Use address pattern in lookup_sym_source
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

Because we may have aliases, like __GI___strcoll_l in
/lib64/libc-2.10.2.so that appears in objdump as:

$ objdump --start-address=0x0000003715a86420 \
--stop-address=0x0000003715a872dc -dS /lib64/libc-2.10.2.so
0000003715a86420 <__strcoll_l>:
3715a86420: 55 push %rbp
3715a86421: 48 89 e5 mov %rsp,%rbp
3715a86424: 41 57 push %r15
[root@doppio linux-2.6-tip]#
So look for the address exactly at the start of the line instead so that
annotation can work for in these cases.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Kirill Smelkov <kirr@landau.phys.spbu.ru>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-top.c | 15 ++++++++-------
1 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index befa57e..c72ab50 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -202,10 +202,9 @@ static void parse_source(struct sym_entry *syme)
len = sym->end - sym->start;

sprintf(command,
- "objdump --start-address=0x%016Lx "
- "--stop-address=0x%016Lx -dS %s",
- map__rip_2objdump(map, sym->start),
- map__rip_2objdump(map, sym->end), path);
+ "objdump --start-address=%#0*Lx --stop-address=%#0*Lx -dS %s",
+ BITS_PER_LONG / 4, map__rip_2objdump(map, sym->start),
+ BITS_PER_LONG / 4, map__rip_2objdump(map, sym->end), path);

file = popen(command, "r");
if (!file)
@@ -292,13 +291,15 @@ static void lookup_sym_source(struct sym_entry *syme)
{
struct symbol *symbol = sym_entry__symbol(syme);
struct source_line *line;
- char pattern[PATH_MAX];
+ const size_t pattern_len = BITS_PER_LONG / 4 + 2;
+ char pattern[pattern_len + 1];

- sprintf(pattern, "<%s>:", symbol->name);
+ sprintf(pattern, "%0*Lx <", BITS_PER_LONG / 4,
+ map__rip_2objdump(syme->map, symbol->start));

pthread_mutex_lock(&syme->src->lock);
for (line = syme->src->lines; line; line = line->next) {
- if (strstr(line->line, pattern)) {
+ if (memcmp(line->line, pattern, pattern_len) == 0) {
syme->src->source = line;
break;
}
--
1.6.2.5
--
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