perf parse-events: Inline parse_events_evlist_error

Inline parse_events_evlist_error that is only used in
parse_events_error. Modify parse_events_error to not report a parser
error unless errors haven't already been reported. Make it clearer
that the latter case only happens for unrecognized input.

Before:

  $ perf stat -e 'cycles/period=99999999999999999999/' true
  event syntax error: 'cycles/period=99999999999999999999/'
                                    \___ parser error

  event syntax error: '..les/period=99999999999999999999/'
                                    \___ Bad base 10 number "99999999999999999999"
  Run 'perf list' for a list of valid events

   Usage: perf stat [<options>] [<command>]

      -e, --event <event>   event selector. use 'perf list' to list available events
  $ perf stat -e 'cycles:xyz' true
  event syntax error: 'cycles:xyz'
                             \___ parser error
  Run 'perf list' for a list of valid events

   Usage: perf stat [<options>] [<command>]

      -e, --event <event>   event selector. use 'perf list' to list available events

After:

  $ perf stat -e 'cycles/period=99999999999999999999/xyz' true
  event syntax error: '..les/period=99999999999999999999/xyz'
                                    \___ Bad base 10 number "99999999999999999999"
  Run 'perf list' for a list of valid events

   Usage: perf stat [<options>] [<command>]

      -e, --event <event>   event selector. use 'perf list' to list available events
  $ perf stat -e 'cycles:xyz' true
  event syntax error: 'cycles:xyz'
                             \___ Unrecognized input
  Run 'perf list' for a list of valid events

   Usage: perf stat [<options>] [<command>]

      -e, --event <event>   event selector. use 'perf list' to list available events

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Beeman Strong <beeman@rivosinc.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240416061533.921723-13-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.c

@@ -2760,15 +2760,6 @@ int parse_events_terms__to_strbuf(const struct parse_events_terms *terms, struct
 	return 0;
 }
 
-void parse_events_evlist_error(struct parse_events_state *parse_state,
-			       int idx, const char *str)
-{
-	if (!parse_state->error)
-		return;
-
-	parse_events_error__handle(parse_state->error, idx, strdup(str), NULL);
-}
-
 static void config_terms_list(char *buf, size_t buf_sz)
 {
 	int i;

tools/perf/util/parse-events.h

@@ -226,8 +226,6 @@ int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state
 					void *loc_);
 
 void parse_events__set_leader(char *name, struct list_head *list);
-void parse_events_evlist_error(struct parse_events_state *parse_state,
-			       int idx, const char *str);
 
 struct event_symbol {
 	const char	*symbol;

tools/perf/util/parse-events.y

@@ -790,9 +790,15 @@ sep_slash_slash_dc: '/' '/' | ':' |
 
 %%
 
-void parse_events_error(YYLTYPE *loc, void *parse_state,
+void parse_events_error(YYLTYPE *loc, void *_parse_state,
 			void *scanner __maybe_unused,
 			char const *msg __maybe_unused)
 {
-	parse_events_evlist_error(parse_state, loc->last_column, "parser error");
+	struct parse_events_state *parse_state = _parse_state;
+
+	if (!parse_state->error || !list_empty(&parse_state->error->list))
+		return;
+
+	parse_events_error__handle(parse_state->error, loc->last_column,
+				   strdup("Unrecognized input"), NULL);
 }