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perf expr: Allow NaN to be a valid number

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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
This commit is contained in:
Ian Rogers 2024-02-09 12:49:44 -08:00 committed by Namhyung Kim
parent 923e4616ec
commit 4ea7d94407
1 changed files with 9 additions and 0 deletions
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9
tools/perf/util/expr.l
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@ -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); }