linux-kernel - Re: [PATCH v2 7/8] perf expr: Move ID handling to its own function

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Date:   Thu, 11 Nov 2021 09:21:20 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Song Liu <song@...nel.org>, Wan Jiabing <wanjiabing@...o.com>,
        Yury Norov <yury.norov@...il.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/8] perf expr: Move ID handling to its own function

On Wed, Nov 10, 2021 at 04:21:08PM -0800, Ian Rogers wrote:
> This will facilitate sharing in a follow-on change.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/expr.y | 60 ++++++++++++++++++++++++------------------
>  1 file changed, 34 insertions(+), 26 deletions(-)
> 
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index ba6c6dbf30c8..d90addf9b937 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -3,6 +3,7 @@
>  #define YYDEBUG 1
>  #include <assert.h>
>  #include <math.h>
> +#include <stdlib.h>
>  #include "util/debug.h"
>  #define IN_EXPR_Y 1
>  #include "expr.h"
> @@ -82,6 +83,38 @@ static struct ids union_expr(struct ids ids1, struct ids ids2)
>  	return result;
>  }
>  
> +static struct ids handle_id(struct expr_parse_ctx *ctx, char *id,
> +			    bool compute_ids)
> +{
> +	struct ids result;

nit, missing extra line in here

other than that for the whole patchset:

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> +	if (!compute_ids) {
> +		/*
> +		 * Compute the event's value from ID. If the ID isn't known then
> +		 * it isn't used to compute the formula so set to NAN.
> +		 */
> +		struct expr_id_data *data;
> +
> +		result.val = NAN;
> +		if (expr__resolve_id(ctx, id, &data) == 0)
> +			result.val = expr_id_data__value(data);
> +
> +		result.ids = NULL;
> +		free(id);
> +	} else {
> +		/*
> +		 * Set the value to BOTTOM to show that any value is possible
> +		 * when the event is computed. Create a set of just the ID.
> +		 */
> +		result.val = BOTTOM;
> +		result.ids = ids__new();
> +		if (!result.ids || ids__insert(result.ids, id)) {
> +			pr_err("Error creating IDs for '%s'", id);
> +			free(id);
> +		}
> +	}
> +	return result;
> +}
> +
>  /*
>   * If we're not computing ids or $1 and $3 are constants, compute the new
>   * constant value using OP. Its invariant that there are no ids.  If computing
> @@ -167,32 +200,7 @@ expr: NUMBER
>  	$$.val = $1;
>  	$$.ids = NULL;
>  }
> -| ID
> -{
> -	if (!compute_ids) {
> -		/*
> -		 * Compute the event's value from ID. If the ID isn't known then
> -		 * it isn't used to compute the formula so set to NAN.
> -		 */
> -		struct expr_id_data *data;
> -
> -		$$.val = NAN;
> -		if (expr__resolve_id(ctx, $1, &data) == 0)
> -			$$.val = expr_id_data__value(data);
> -
> -		$$.ids = NULL;
> -		free($1);
> -	} else {
> -		/*
> -		 * Set the value to BOTTOM to show that any value is possible
> -		 * when the event is computed. Create a set of just the ID.
> -		 */
> -		$$.val = BOTTOM;
> -		$$.ids = ids__new();
> -		if (!$$.ids || ids__insert($$.ids, $1))
> -			YYABORT;
> -	}
> -}
> +| ID		{ $$ = handle_id(ctx, $1, compute_ids); }
>  | expr '|' expr { BINARY_LONG_OP($$, |, $1, $3); }
>  | expr '&' expr { BINARY_LONG_OP($$, &, $1, $3); }
>  | expr '^' expr { BINARY_LONG_OP($$, ^, $1, $3); }
> -- 
> 2.34.0.rc1.387.gb447b232ab-goog
>