perf probe: Show accessible local variables
Add -V (--vars) option for listing accessible local variables at given probe
point. This will help finding which local variables are available for event
arguments.
e.g.)
# perf probe -V call_timer_fn:23
Available variables at call_timer_fn:23
@<run_timer_softirq+345>
function_type* fn
int preempt_count
long unsigned int data
struct list_head work_list
struct list_head* head
struct timer_list* timer
struct tvec_base* base
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20101021101323.3542.40282.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 4507d51..baffd25 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -25,17 +25,22 @@
extern int find_perf_probe_point(int fd, unsigned long addr,
struct perf_probe_point *ppt);
+/* Find a line range */
extern int find_line_range(int fd, struct line_range *lr);
+/* Find available variables */
+extern int find_available_vars_at(int fd, struct perf_probe_event *pev,
+ struct variable_list **vls, int max_points);
+
#include <dwarf.h>
#include <libdw.h>
#include <version.h>
struct probe_finder {
struct perf_probe_event *pev; /* Target probe event */
- struct probe_trace_event *tevs; /* Result trace events */
- int ntevs; /* Number of trace events */
- int max_tevs; /* Max number of trace events */
+
+ /* Callback when a probe point is found */
+ int (*callback)(Dwarf_Die *sp_die, struct probe_finder *pf);
/* For function searching */
int lno; /* Line number */
@@ -53,6 +58,20 @@
struct probe_trace_arg *tvar; /* Current result variable */
};
+struct trace_event_finder {
+ struct probe_finder pf;
+ struct probe_trace_event *tevs; /* Found trace events */
+ int ntevs; /* Number of trace events */
+ int max_tevs; /* Max number of trace events */
+};
+
+struct available_var_finder {
+ struct probe_finder pf;
+ struct variable_list *vls; /* Found variable lists */
+ int nvls; /* Number of variable lists */
+ int max_vls; /* Max no. of variable lists */
+};
+
struct line_finder {
struct line_range *lr; /* Target line range */
