Messages in this thread Patch in this message |  | | From | Andi Kleen <> | Subject | [PATCH 05/12] perf, tools, probe: Print location for resolved variables | Date | Mon, 27 Nov 2017 16:23:14 -0800 |
| |
From: Andi Kleen <ak@linux.intel.com>
Print the location, e.g. the register, for resolved variables with perf probe -V. This is useful for debugging, and manually making sense of disassembly. I also have some scripts which can make use of this information.
Before:
% perf probe -x ./tsrc/tstruct -V main+20 Available variables at main+20 @<main+20> struct str* xp
After:
% perf probe -x ./tsrc/tstruct -V main+20 Available variables at main+20 @<main+20> struct str* xp %ax
Signed-off-by: Andi Kleen <ak@linux.intel.com> --- tools/perf/util/probe-finder.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 0149428d453e..699f29d8a28e 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -1369,6 +1369,7 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data) if (tag == DW_TAG_formal_parameter || tag == DW_TAG_variable) { struct probe_trace_arg ta; + struct probe_trace_arg_ref *ref; memset(&ta, 0, sizeof(struct probe_trace_arg)); ret = convert_variable_location(die_mem, af->pf.addr, @@ -1401,6 +1402,10 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data) die_mem, &buf); } + strbuf_addf(&buf, "\t%s", ta.value); + for (ref = ta.ref; ref; ref = ref->next) + strbuf_addf(&buf, " off %ld", ref->offset); + pr_debug("Add new var: %s\n", buf.buf); if (ret2 == 0) { struct str_node *sn; -- 2.13.6
|  |