perf parse-events: Factor out '<event_or_pmu>/.../' parsing

Factor out the case of an event or PMU name followed by a slash based
term list. This is with a view to sharing the code with new legacy
hardware parsing. Use early return to reduce indentation in the code.
Make parse_events_add_pmu static now it doesn't need sharing with
parse-events.y.
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/20240416061533.921723-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.c

@@ -1385,7 +1385,7 @@ static bool config_term_percore(struct list_head *config_terms)
 	return false;
 }
 
-int parse_events_add_pmu(struct parse_events_state *parse_state,
+static int parse_events_add_pmu(struct parse_events_state *parse_state,
 			 struct list_head *list, const char *name,
 			 const struct parse_events_terms *const_parsed_terms,
 			 bool auto_merge_stats, void *loc_)
@@ -1618,6 +1618,74 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
 	return ok ? 0 : -1;
 }
 
+int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state,
+					const char *event_or_pmu,
+					const struct parse_events_terms *const_parsed_terms,
+					struct list_head **listp,
+					void *loc_)
+{
+	char *pattern = NULL;
+	YYLTYPE *loc = loc_;
+	struct perf_pmu *pmu = NULL;
+	int ok = 0;
+	char *help;
+
+	*listp = malloc(sizeof(**listp));
+	if (!*listp)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(*listp);
+
+	/* Attempt to add to list assuming event_or_pmu is a PMU name. */
+	if (!parse_events_add_pmu(parse_state, *listp, event_or_pmu, const_parsed_terms,
+					/*auto_merge_stats=*/false, loc))
+		return 0;
+
+	/* Failed to add, try wildcard expansion of event_or_pmu as a PMU name. */
+	if (asprintf(&pattern, "%s*", event_or_pmu) < 0) {
+		zfree(listp);
+		return -ENOMEM;
+	}
+
+	while ((pmu = perf_pmus__scan(pmu)) != NULL) {
+		const char *name = pmu->name;
+
+		if (parse_events__filter_pmu(parse_state, pmu))
+			continue;
+
+		if (!strncmp(name, "uncore_", 7) &&
+		    strncmp(event_or_pmu, "uncore_", 7))
+			name += 7;
+		if (!perf_pmu__match(pattern, name, event_or_pmu) ||
+		    !perf_pmu__match(pattern, pmu->alias_name, event_or_pmu)) {
+			bool auto_merge_stats = perf_pmu__auto_merge_stats(pmu);
+
+			if (!parse_events_add_pmu(parse_state, *listp, pmu->name,
+						  const_parsed_terms,
+						  auto_merge_stats, loc)) {
+				ok++;
+				parse_state->wild_card_pmus = true;
+			}
+		}
+	}
+	zfree(&pattern);
+	if (ok)
+		return 0;
+
+	/* Failure to add, assume event_or_pmu is an event name. */
+	zfree(listp);
+	if (!parse_events_multi_pmu_add(parse_state, event_or_pmu, const_parsed_terms, listp, loc))
+		return 0;
+
+	if (asprintf(&help, "Unable to find PMU or event on a PMU of '%s'", event_or_pmu) < 0)
+		help = NULL;
+	parse_events_error__handle(parse_state->error, loc->first_column,
+				strdup("Bad event or PMU"),
+				help);
+	zfree(listp);
+	return -EINVAL;
+}
+
 int parse_events__modifier_group(struct list_head *list,
 				 char *event_mod)
 {

tools/perf/util/parse-events.h

@@ -209,10 +209,6 @@ int parse_events_add_breakpoint(struct parse_events_state *parse_state,
 				struct list_head *list,
 				u64 addr, char *type, u64 len,
 				struct parse_events_terms *head_config);
-int parse_events_add_pmu(struct parse_events_state *parse_state,
-			 struct list_head *list, const char *name,
-			 const struct parse_events_terms *const_parsed_terms,
-			bool auto_merge_stats, void *loc);
 
 struct evsel *parse_events__add_event(int idx, struct perf_event_attr *attr,
 				      const char *name, const char *metric_id,
@@ -223,6 +219,12 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
 			       const struct parse_events_terms *const_parsed_terms,
 			       struct list_head **listp, void *loc);
 
+int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state,
+					const char *event_or_pmu,
+					const struct parse_events_terms *const_parsed_terms,
+					struct list_head **listp,
+					void *loc_);
+
 void parse_events__set_leader(char *name, struct list_head *list);
 void parse_events_update_lists(struct list_head *list_event,
 			       struct list_head *list_all);

tools/perf/util/parse-events.y

@@ -273,78 +273,15 @@ event_def: event_pmu |
 event_pmu:
 PE_NAME opt_pmu_config
 {
-	struct parse_events_state *parse_state = _parse_state;
 	/* List of created evsels. */
 	struct list_head *list = NULL;
-	char *pattern = NULL;
-
-#define CLEANUP						\
-	do {						\
-		parse_events_terms__delete($2);		\
-		free(list);				\
-		free($1);				\
-		free(pattern);				\
-	} while(0)
+	int err = parse_events_multi_pmu_add_or_add_pmu(_parse_state, $1, $2, &list, &@1);
 
-	list = alloc_list();
-	if (!list) {
-		CLEANUP;
-		YYNOMEM;
-	}
-	/* Attempt to add to list assuming $1 is a PMU name. */
-	if (parse_events_add_pmu(parse_state, list, $1, $2, /*auto_merge_stats=*/false, &@1)) {
-		struct perf_pmu *pmu = NULL;
-		int ok = 0;
-
-		/* Failure to add, try wildcard expansion of $1 as a PMU name. */
-		if (asprintf(&pattern, "%s*", $1) < 0) {
-			CLEANUP;
-			YYNOMEM;
-		}
-
-		while ((pmu = perf_pmus__scan(pmu)) != NULL) {
-			const char *name = pmu->name;
-
-			if (parse_events__filter_pmu(parse_state, pmu))
-				continue;
-
-			if (!strncmp(name, "uncore_", 7) &&
-			    strncmp($1, "uncore_", 7))
-				name += 7;
-			if (!perf_pmu__match(pattern, name, $1) ||
-			    !perf_pmu__match(pattern, pmu->alias_name, $1)) {
-				bool auto_merge_stats = perf_pmu__auto_merge_stats(pmu);
-
-				if (!parse_events_add_pmu(parse_state, list, pmu->name, $2,
-							  auto_merge_stats, &@1)) {
-					ok++;
-					parse_state->wild_card_pmus = true;
-				}
-			}
-		}
-
-		if (!ok) {
-			/* Failure to add, assume $1 is an event name. */
-			zfree(&list);
-			ok = !parse_events_multi_pmu_add(parse_state, $1, $2, &list, &@1);
-		}
-		if (!ok) {
-			struct parse_events_error *error = parse_state->error;
-			char *help;
-
-			if (asprintf(&help, "Unable to find PMU or event on a PMU of '%s'", $1) < 0)
-				help = NULL;
-			parse_events_error__handle(error, @1.first_column,
-						   strdup("Bad event or PMU"),
-						   help);
-			CLEANUP;
-			YYABORT;
-		}
-	}
+	parse_events_terms__delete($2);
+	free($1);
+	if (err)
+		PE_ABORT(err);
 	$$ = list;
-	list = NULL;
-	CLEANUP;
-#undef CLEANUP
 }
 |
 PE_NAME sep_dc