[PATCH 2/4] perf expr: Allow comments in custom metric file

[Jiri Olsa <jolsa@kernel.org>]

Adding support to use comments within the custom metric file
with both the shell '# ... ' and C '/* ... */ styles.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/expr.l | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l
index c6a930ed22e6..e9b294ba09fc 100644
--- a/tools/perf/util/expr.l
+++ b/tools/perf/util/expr.l
@@ -82,6 +82,8 @@ static int str(yyscan_t scanner, int token, int runtime)
 %}
 
 %x custom
+%x comment_single
+%x comment_multi
 
 number		[0-9]*\.?[0-9]+
 
@@ -116,6 +118,16 @@ else		{ return ELSE; }
 #smt_on		{ return SMT_ON; }
 {number}	{ return value(yyscanner); }
 {symbol}	{ return str(yyscanner, ID, sctx->runtime); }
+
+"//"			{ BEGIN(comment_single); }
+<comment_single>\n	{ BEGIN(INITIAL); }
+<comment_single>.	{ }
+
+"/*"			{ BEGIN(comment_multi); }
+<comment_multi>"*/"	{ BEGIN(INITIAL); }
+<comment_multi>\n	{ }
+<comment_multi>.	{ }
+
 "|"		{ return '|'; }
 "^"		{ return '^'; }
 "&"		{ return '&'; }
-- 
2.25.4