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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2015-04-02 16:33:12 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-04-02 13:18:44 -0300
commitc72738355b2ac79506fbfa10ffee8fe3a27e69da (patch)
tree80eb75ac29267a0cf3b70b66af3ef0ffd5c3f551 /tools
parentb83e868d0a0350c107b98417b4dcc73834506f98 (diff)
downloadop-kernel-dev-c72738355b2ac79506fbfa10ffee8fe3a27e69da.zip
op-kernel-dev-c72738355b2ac79506fbfa10ffee8fe3a27e69da.tar.gz
perf probe: Fix to track down unnamed union/structure members
Fix 'perf probe' to track down unnamed union/structure members. perf probe did not track down the tree of unnamed union/structure members, since it just failed to find given "name" in a parent structure/union. To solve this issue, I've introduced 2 changes. - Fix die_find_member() to track down the type-DIE if it is unnamed, and if it contains the specified member, returns the unnamed member. (note that we don't return found member, since unnamed member has the offset in the parent structure) - Fix convert_variable_fields() to track down the unnamed union/ structure (one-by-one). With this patch, perf probe can access unnamed fields: ----- #./perf probe -nfx ./perf lock__delete ops 'locked_ops=ops->locked.ops' Added new event: probe_perf:lock__delete (on lock__delete in /home/mhiramat/ksrc/linux-3/tools/perf/perf with ops locked_ops=ops->locked.ops) You can now use it in all perf tools, such as: perf record -e probe_perf:lock__delete -aR sleep 1 ----- Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> Report-Link: https://lkml.org/lkml/2015/3/5/431 Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20150402073312.14482.37942.stgit@localhost.localdomain Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/dwarf-aux.c14
-rw-r--r--tools/perf/util/probe-finder.c8
2 files changed, 17 insertions, 5 deletions
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index 780b2bc..c34e024 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -801,10 +801,16 @@ static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
{
const char *name = data;
- if ((dwarf_tag(die_mem) == DW_TAG_member) &&
- die_compare_name(die_mem, name))
- return DIE_FIND_CB_END;
-
+ if (dwarf_tag(die_mem) == DW_TAG_member) {
+ if (die_compare_name(die_mem, name))
+ return DIE_FIND_CB_END;
+ else if (!dwarf_diename(die_mem)) { /* Unnamed structure */
+ Dwarf_Die type_die, tmp_die;
+ if (die_get_type(die_mem, &type_die) &&
+ die_find_member(&type_die, name, &tmp_die))
+ return DIE_FIND_CB_END;
+ }
+ }
return DIE_FIND_CB_SIBLING;
}
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 46f009a..7831e2d 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -460,7 +460,8 @@ static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
" nor array.\n", varname);
return -EINVAL;
}
- if (field->ref) {
+ /* While prcessing unnamed field, we don't care about this */
+ if (field->ref && dwarf_diename(vr_die)) {
pr_err("Semantic error: %s must be referred by '.'\n",
field->name);
return -EINVAL;
@@ -491,6 +492,11 @@ static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
}
ref->offset += (long)offs;
+ /* If this member is unnamed, we need to reuse this field */
+ if (!dwarf_diename(die_mem))
+ return convert_variable_fields(die_mem, varname, field,
+ &ref, die_mem);
+
next:
/* Converting next field */
if (field->next)
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