linux-kernel - [PATCH v1 13/13] perf parse-events: Remove ABORT

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Date:   Mon, 26 Jun 2023 21:34:58 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH v1 13/13] perf parse-events: Remove ABORT_ON

Prefer informative messages rather than none with ABORT_ON. Document
one failure mode and add an error message for another.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/parse-events.y | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 844646752462..454577f7aff6 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -22,12 +22,6 @@
 
 void parse_events_error(YYLTYPE *loc, void *parse_state, void *scanner, char const *msg);
 
-#define ABORT_ON(val) \
-do { \
-	if (val) \
-		YYABORT; \
-} while (0)
-
 #define PE_ABORT(val) \
 do { \
 	if (val == -ENOMEM) \
@@ -618,7 +612,9 @@ PE_RAW opt_event_config
 		YYNOMEM;
 	errno = 0;
 	num = strtoull($1 + 1, NULL, 16);
-	ABORT_ON(errno);
+	/* Given the lexer will only give [a-fA-F0-9]+ a failure here should be impossible. */
+	if (errno)
+		YYABORT;
 	free($1);
 	err = parse_events_add_numeric(_parse_state, list, PERF_TYPE_RAW, num, $2,
 				       /*wildcard=*/false);
@@ -978,7 +974,17 @@ PE_VALUE PE_ARRAY_RANGE PE_VALUE
 {
 	struct parse_events_array array;
 
-	ABORT_ON($3 < $1);
+	if ($3 < $1) {
+		struct parse_events_state *parse_state = _parse_state;
+		struct parse_events_error *error = parse_state->error;
+		char *err_str;
+
+		if (asprintf(&err_str, "Expected '%ld' to be less-than '%ld'", $3, $1) < 0)
+			err_str = NULL;
+
+		parse_events_error__handle(error, @1.first_column, err_str, NULL);
+		YYABORT;
+	}
 	array.nr_ranges = 1;
 	array.ranges = malloc(sizeof(array.ranges[0]));
 	if (!array.ranges)
-- 
2.41.0.162.gfafddb0af9-goog