perf probe: Fix to find range-only function instance

Fix die_is_func_instance() to find range-only function instance.

In some case, a function instance can be made without any low PC or
entry PC, but only with address ranges by optimization.  (e.g. cold text
partially in "text.unlikely" section) To find such function instance, we
have to check the range attribute too.

Fixes: e1ecbbc3fa83 ("perf probe: Fix to handle optimized not-inlined functions")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/157190835669.1859.8368628035930950596.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index df6cee5c071f30da11df61f3066eff1b534e3b4a..2ec24c3bed44cf016da41f36838bd890e3707729 100644 (file)
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -318,10 +318,14 @@ bool die_is_func_def(Dwarf_Die *dw_die)
 bool die_is_func_instance(Dwarf_Die *dw_die)
 {
        Dwarf_Addr tmp;
+       Dwarf_Attribute attr_mem;
 
        /* Actually gcc optimizes non-inline as like as inlined */
-       return !dwarf_func_inline(dw_die) && dwarf_entrypc(dw_die, &tmp) == 0;
+       return !dwarf_func_inline(dw_die) &&
+              (dwarf_entrypc(dw_die, &tmp) == 0 ||
+               dwarf_attr(dw_die, DW_AT_ranges, &attr_mem) != NULL);
 }
+
 /**
  * die_get_data_member_location - Get the data-member offset
  * @mb_die: a DIE of a member of a data structure