linux-kernel - Re: [PATCH V2 3/6] perf tools: add infrastructure for PMU specific configuration

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Message-ID: <20160721145434.GA15915@krava>
Date:	Thu, 21 Jul 2016 16:54:34 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>, jolsa@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V2 3/6] perf tools: add infrastructure for PMU specific
 configuration

On Thu, Jul 21, 2016 at 08:44:53AM -0600, Mathieu Poirier wrote:

SNIP

> >> diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> >> index 7a2519435da0..1f7e11a6c5b3 100644
> >> --- a/tools/perf/util/parse-events.l
> >> +++ b/tools/perf/util/parse-events.l
> >> @@ -53,6 +53,16 @@ static int str(yyscan_t scanner, int token)
> >>       return token;
> >>  }
> >>
> >> +static int drv_str(yyscan_t scanner, int token)
> >> +{
> >> +     YYSTYPE *yylval = parse_events_get_lval(scanner);
> >> +     char *text = parse_events_get_text(scanner);
> >> +
> >> +     /* Strip off the '@' */
> >> +     yylval->str = strdup(text + 1);
> >> +     return token;
> >> +}
> >
> > why don't let bison parse this with rule like:
> >
> > | '@' PE_DRV_CFG_TERM
> > {
> > ...
> > }
> >
> >
> > you could omit the drv_str function then
> 
> I simply thought it was simple and clean to do it that way - and it
> follows the trend already in place.  Are you sure you want me to move
> this to bison?  Either way we have to add code...
> 
> Many thanks for the review,
> Mathieu

hum, i might be missing something, but what I meant
was something like below

thanks,
jirka


---
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 1f7e11a6c5b3..9b00f9b9caa2 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -53,16 +53,6 @@ static int str(yyscan_t scanner, int token)
 	return token;
 }
 
-static int drv_str(yyscan_t scanner, int token)
-{
-	YYSTYPE *yylval = parse_events_get_lval(scanner);
-	char *text = parse_events_get_text(scanner);
-
-	/* Strip off the '@' */
-	yylval->str = strdup(text + 1);
-	return token;
-}
-
 #define REWIND(__alloc)				\
 do {								\
 	YYSTYPE *__yylval = parse_events_get_lval(yyscanner);	\
@@ -220,7 +210,7 @@ no-overwrite		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NOOVERWRITE); }
 {name_minus}		{ return str(yyscanner, PE_NAME); }
 \[all\]			{ return PE_ARRAY_ALL; }
 "["			{ BEGIN(array); return '['; }
-@...v_cfg_term}		{ return drv_str(yyscanner, PE_DRV_CFG_TERM); }
+{drv_cfg_term}		{ return PE_DRV_CFG_TERM; }
 }
 
 <mem>{
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 879115f93edc..b7af1b834fda 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -602,12 +602,12 @@ PE_NAME array '=' PE_VALUE
 	$$ = term;
 }
 |
-PE_DRV_CFG_TERM
+'@' PE_DRV_CFG_TERM
 {
 	struct parse_events_term *term;
 
 	ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_DRV_CFG,
-					$1, $1, &@1, NULL));
+					$2, $2, &@2, NULL));
 	$$ = term;
 }