perf probe: Query basic types from debuginfo

Query the basic type information (byte-size and signed-flag) from
debuginfo and pass that to kprobe-tracer. This is especially useful
for tracing the members of data structure, because each member has
different byte-size on the memory.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100412171715.3790.23730.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 19de8b77973d..05ca4a959e60 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -740,6 +740,13 @@ static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
                 buf += ret;
                 buflen -= ret;
         }
+        /* Print argument type */
+        if (arg->type) {
+                ret = e_snprintf(buf, buflen, ":%s", arg->type);
+                if (ret <= 0)
+                        return ret;
+                buf += ret;
+        }
 
         return buf - tmp;
 }
@@ -848,6 +855,8 @@ void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
                         free(tev->args[i].name);
                 if (tev->args[i].value)
                         free(tev->args[i].value);
+                if (tev->args[i].type)
+                        free(tev->args[i].type);
                 ref = tev->args[i].ref;
                 while (ref) {
                         next = ref->next;