[PATCH -tip v2 4/9] [BUGFIX] perf probe: Fix to walk all inline instances

Masami Hiramatsu
2011-08-11T11:27:00Z

Fix line-range collector to walk all instances of inlined
function, because some execution paths can be optimized out
depends on the function argument of instances.

E.g.)
inline_func (arg) {
if (arg)
do_something;
else
do_another;
}

func_A() {
inline_func(1)
}

func_B() {
inline_func(0)
}

In this case, func_A may have only do_something code and
func_B may have only do_another.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
---

tools/perf/util/probe-finder.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 573c723..d6d5768 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1393,7 +1393,13 @@ static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
struct dwarf_callback_param *param = data;

param->retval = find_line_range_by_line(in_die, param->data);
- return DWARF_CB_ABORT; /* No need to find other instances */
+
+ /*
+ * We have to check all instances of inlined function, because
+ * some execution paths can be optimized out depends on the
+ * function argument of instances
+ */
+ return DWARF_CB_OK;
}

/* Search function from function name */