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Fri, 09 Feb 2024 12:50:11 -0800 (PST) Date: Fri, 9 Feb 2024 12:49:44 -0800 In-Reply-To: <20240209204947.3873294-1-irogers@google.com> Message-Id: <20240209204947.3873294-2-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240209204947.3873294-1-irogers@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Subject: [PATCH v1 1/4] perf expr: Allow NaN to be a valid number From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , John Garry , Kan Liang , James Clark , K Prateek Nayak , Kaige Ye , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790455955263100217 X-GMAIL-MSGID: 1790455955263100217 Currently only floating point numbers can be parsed, add a special case for NaN. Signed-off-by: Ian Rogers --- tools/perf/util/expr.l | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l index 0feef0726c48..a2fc43159ee9 100644 --- a/tools/perf/util/expr.l +++ b/tools/perf/util/expr.l @@ -94,6 +94,14 @@ static int literal(yyscan_t scanner, const struct expr_scanner_ctx *sctx) } return LITERAL; } + +static int nan_value(yyscan_t scanner) +{ + YYSTYPE *yylval = expr_get_lval(scanner); + + yylval->num = NAN; + return NUMBER; +} %} number ([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)(e-?[0-9]+)? @@ -115,6 +123,7 @@ else { return ELSE; } source_count { return SOURCE_COUNT; } has_event { return HAS_EVENT; } strcmp_cpuid_str { return STRCMP_CPUID_STR; } +NaN { return nan_value(yyscanner); } {literal} { return literal(yyscanner, sctx); } {number} { return value(yyscanner); } {symbol} { return str(yyscanner, ID, sctx->runtime); }