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authorMasami Hiramatsu <mhiramat@kernel.org>2019-10-24 18:12:36 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-01-04 13:34:14 +0100
commit73bea529d14f39f0ae8ae9110e49377967abd278 (patch)
tree124abfee8953e622a6115cfe90c9fcd9cdc12cb4 /tools
parentd095e83679791119d03a30e6b511600f123b87b0 (diff)
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 <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> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/dwarf-aux.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index a509aa8433a1..af78d6fc8d12 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -304,10 +304,14 @@ 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