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Subject[PATCH v2] perf report: do not drop last inlined frame
Date
The very last inlined frame, i.e. the one furthest away from the
non-inlined frame, was silently dropped. This is apparent when
comparing the output of `perf script` and `addr2line`:

~~~~~~
$ perf script --inline
...
a.out 26722 80836.309329: 72425 cycles:
21493 __hypot_finite (/usr/lib/libm-2.25.so)
a4a std::abs<double> (inline) (/tmp/a.out)
a4a std::_Norm_helper<true>::_S_do_it<double> (inline) (/tmp/a.out)
a4a std::norm<double> (inline) (/tmp/a.out)
a4a main (/tmp/a.out)
20510 __libc_start_main (/usr/lib/libc-2.25.so)
bd9 _start (/tmp/a.out)

$ addr2line -a -f -i -e /tmp/a.out a4a | c++filt
0x0000000000000a4a
std::__complex_abs(doublecomplex )
/usr/include/c++/6.3.1/complex:589
double std::abs<double>(std::complex<double> const&)
/usr/include/c++/6.3.1/complex:597
double std::_Norm_helper<true>::_S_do_it<double>(std::complex<double> const&)
/usr/include/c++/6.3.1/complex:654
double std::norm<double>(std::complex<double> const&)
/usr/include/c++/6.3.1/complex:664
main
/tmp/inlining.cpp:14
~~~~~

Note how `std::__complex_abs` is missing from the `perf script`
output. This is similarly showing up in `perf report`. The patch
here fixes this issue, and the output becomes:

~~~~~
a.out 26722 80836.309329: 72425 cycles:
21493 __hypot_finite (/usr/lib/libm-2.25.so)
ace3 hypot (/usr/lib/libm-2.25.so)
a4a std::__complex_abs (inline) (/tmp/a.out)
a4a std::abs<double> (inline) (/tmp/a.out)
a4a std::_Norm_helper<true>::_S_do_it<double> (inline) (/tmp/a.out)
a4a std::norm<double> (inline) (/tmp/a.out)
a4a main (/tmp/a.out)
20510 __libc_start_main (/usr/lib/libc-2.25.so)
bd9 _start (/tmp/a.out)
~~~~~

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yao Jin <yao.jin@linux.intel.com>
Signed-off-by: Milian Wolff <milian.wolff@kdab.com>
---
tools/perf/util/srcline.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)

v2:
- rebase against patch fixing memleak in addr2lines

diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index bbba9c69cfec..168285d37cd2 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -203,6 +203,16 @@ static void addr2line_cleanup(struct a2l_data *a2l)

#define MAX_INLINE_NEST 1024

+static int inline_list__append_dso_a2l(struct dso *dso,
+ struct inline_node *node)
+{
+ struct a2l_data *a2l = dso->a2l;
+ char *funcname = a2l->funcname ? strdup(a2l->funcname) : NULL;
+ char *filename = a2l->filename ? strdup(a2l->filename) : NULL;
+
+ return inline_list__append(filename, funcname, a2l->line, node, dso);
+}
+
static int addr2line(const char *dso_name, u64 addr,
char **file, unsigned int *line, struct dso *dso,
bool unwind_inlines, struct inline_node *node)
@@ -231,15 +241,15 @@ static int addr2line(const char *dso_name, u64 addr,
if (unwind_inlines) {
int cnt = 0;

+ if (node && inline_list__append_dso_a2l(dso, node))
+ return 0;
+
while (bfd_find_inliner_info(a2l->abfd, &a2l->filename,
&a2l->funcname, &a2l->line) &&
cnt++ < MAX_INLINE_NEST) {

if (node != NULL) {
- if (inline_list__append(strdup(a2l->filename),
- strdup(a2l->funcname),
- a2l->line, node,
- dso) != 0)
+ if (inline_list__append_dso_a2l(dso, node))
return 0;
// found at least one inline frame
ret = 1;
--
2.13.0
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