From 30ad6a85394e3035b717df646a14db5eea23b08f Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Thu, 24 Oct 2019 18:12:36 +0900 Subject: [PATCH] perf probe: Fix to find range-only function instance [ Upstream commit b77afa1f810f37bd8a36cb1318178dfe2d7af6b6 ] 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 Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lore.kernel.org/lkml/157190835669.1859.8368628035930950596.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/dwarf-aux.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index 7eb7de5..5bbb87f6 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -331,10 +331,14 @@ 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 -- 2.7.4