perf expr: Allow NaN to be a valid number

Currently only floating point numbers can be parsed, add a special
case for NaN.

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: James Clark <james.clark@arm.com>
Cc: Kaige Ye <ye@kaige.org>
Cc: John Garry <john.g.garry@oracle.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240209204947.3873294-2-irogers@google.com

diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l
index 0feef07..a2fc431 100644 (file)
--- 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); }