perf tools: Fix legacy events symbol separator parsing

Fixing legacy symbol events parsing. We can't support single slash
separator, like 'cycles/u', because it conflicts with non empty terms,
like 'cycles/period/u'.

Keeping only '//' and ':' separator for these events:
cycles//u
cycles:k

And removing '/' separator support, which is not working
anymore. Also adding automated tests for above events.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/parse-events.c

···
 	return 0;
 }
 
+static int test__sym_event_slash(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel = perf_evlist__first(evlist);
+
+	TEST_ASSERT_VAL("wrong type", evsel->attr.type == PERF_TYPE_HARDWARE);
+	TEST_ASSERT_VAL("wrong config", evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES);
+	TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
+	return 0;
+}
+
+static int test__sym_event_dc(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel = perf_evlist__first(evlist);
+
+	TEST_ASSERT_VAL("wrong type", evsel->attr.type == PERF_TYPE_HARDWARE);
+	TEST_ASSERT_VAL("wrong config", evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES);
+	TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
+	return 0;
+}
+
 static int count_tracepoints(void)
 {
 	struct dirent *events_ent;
···
 		.name  = "cycles/name='COMPLEX_CYCLES_NAME:orig=cycles,desc=chip-clock-ticks'/Duk",
 		.check = test__checkevent_complex_name,
 		.id    = 53
+	},
+	{
+		.name  = "cycles//u",
+		.check = test__sym_event_slash,
+		.id    = 54,
+	},
+	{
+		.name  = "cycles:k",
+		.check = test__sym_event_dc,
+		.id    = 55,
 	}
 };
 

tools/perf/util/parse-events.y

···
 	$$ = list;
 }
 |
-value_sym sep_slash_dc
+value_sym sep_slash_slash_dc
 {
 	struct list_head *list;
 	int type = $1 >> 16;
···
 
 sep_dc: ':' |
 
-sep_slash_dc: '/' | ':' |
+sep_slash_slash_dc: '/' '/' | ':' |
 
 %%