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SubjectRe: [BUG] libtraceevent: perf script -g python segfaults
On Thu, 17 Oct 2019 16:28:32 -0300
Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> wrote:

> Em Thu, Oct 17, 2019 at 02:41:14PM -0400, Steven Rostedt escreveu:
> > On Thu, 17 Oct 2019 14:38:41 -0400
> > Steven Rostedt <rostedt@goodmis.org> wrote:
> >
> > > struct tep_event *trace_find_next_event(struct tep_handle *pevent,
> > > struct tep_event *event)
> > > {
> > > + static struct tep_event **all_events;
> > > static int idx;
> > > int events_count;
> > > - struct tep_event *all_events;
> >
> > If we are going to use static variables, let's make them all static and
> > optimize it a little more...
>
> I'll test it, but can't you have this somewhere else, i.e. at
> tep_handle perhaps?
>
>

Or we can nuke the function entirely, it's a rather silly helper
anyway. Just do this:

-- Steve


diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index b93f36b887b5..f1d5f564aa46 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -537,10 +537,11 @@ static int perl_stop_script(void)

static int perl_generate_script(struct tep_handle *pevent, const char *outfile)
{
+ int i, not_first, count, nr_events;
+ struct tep_event **all_events;
struct tep_event *event = NULL;
struct tep_format_field *f;
char fname[PATH_MAX];
- int not_first, count;
FILE *ofp;

sprintf(fname, "%s.pl", outfile);
@@ -601,8 +602,11 @@ sub print_backtrace\n\
}\n\n\
");

+ nr_events = tep_get_events_count(pevent);
+ all_events = tep_list_events(pevent, TEP_EVENT_SORT_ID);

- while ((event = trace_find_next_event(pevent, event))) {
+ for (i = 0; all_events && i < nr_events; i++) {
+ event = all_events[i];
fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
fprintf(ofp, "\tmy (");

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 87ef16a1b17e..2a148a10d0de 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -1590,10 +1590,11 @@ static int python_stop_script(void)

static int python_generate_script(struct tep_handle *pevent, const char *outfile)
{
+ int i, not_first, count, nr_events;
+ struct tep_event **all_events;
struct tep_event *event = NULL;
struct tep_format_field *f;
char fname[PATH_MAX];
- int not_first, count;
FILE *ofp;

sprintf(fname, "%s.py", outfile);
@@ -1638,7 +1639,11 @@ static int python_generate_script(struct tep_handle *pevent, const char *outfile
fprintf(ofp, "def trace_end():\n");
fprintf(ofp, "\tprint(\"in trace_end\")\n\n");

- while ((event = trace_find_next_event(pevent, event))) {
+ nr_events = tep_get_events_count(pevent);
+ all_events = tep_list_events(pevent, TEP_EVENT_SORT_ID);
+
+ for (i = 0; all_events && i < nr_events; i++) {
+ event = all_events[i];
fprintf(ofp, "def %s__%s(", event->system, event->name);
fprintf(ofp, "event_name, ");
fprintf(ofp, "context, ");

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