Re: [PATCH 03/18] perf metric: Add expr__add_id function

From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>,
	lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Michael Petlan <mpetlan@redhat.com>,
	Andi Kleen <ak@linux.intel.com>, Kajol Jain <kjain@linux.ibm.com>,
	John Garry <john.garry@huawei.com>,
	"Paul A. Clarke" <pc@us.ibm.com>,
	Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 03/18] perf metric: Add expr__add_id function
Date: Thu, 16 Jul 2020 12:29:06 -0300	[thread overview]
Message-ID: <20200716152906.GC374956@kernel.org> (raw)
In-Reply-To: <20200712132634.138901-4-jolsa@kernel.org>

Em Sun, Jul 12, 2020 at 03:26:19PM +0200, Jiri Olsa escreveu:
> Adding expr__add_id function to data for ID
> with zero value, which is used when scanning
> the expression for IDs.
> 
> Acked-by: Ian Rogers <irogers@google.com>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  tools/perf/util/expr.c | 29 +++++++++++++++++++++++------
>  tools/perf/util/expr.h |  1 +
>  tools/perf/util/expr.y |  2 +-
>  3 files changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 5d05f9765ed8..4b8953605aed 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -32,6 +32,24 @@ static bool key_equal(const void *key1, const void *key2,
>  	return !strcmp((const char *)key1, (const char *)key2);
>  }
>  
> +/* Caller must make sure id is allocated */
> +int expr__add_id(struct expr_parse_ctx *ctx, const char *id)
> +{
> +	struct expr_id_data *data_ptr = NULL, *old_data = NULL;
> +	char *old_key = NULL;
> +	int ret;
> +
> +	data_ptr = malloc(sizeof(*data_ptr));
> +	if (!data_ptr)
> +		return -ENOMEM;
> +
> +	ret = hashmap__set(&ctx->ids, id, data_ptr,
> +			   (const void **)&old_key, (void **)&old_data);
> +	free(old_key);
> +	free(old_data);

Hey, if hashmap__set() fails then we leak data_ptr?

- Arnaldo

> +	return ret;
> +}
> +
>  /* Caller must make sure id is allocated */
>  int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val)
>  {
> @@ -39,12 +57,11 @@ int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val)
>  	char *old_key = NULL;
>  	int ret;
>  
> -	if (val != 0.0) {
> -		data_ptr = malloc(sizeof(*data_ptr));
> -		if (!data_ptr)
> -			return -ENOMEM;
> -		data_ptr->val = val;
> -	}
> +	data_ptr = malloc(sizeof(*data_ptr));
> +	if (!data_ptr)
> +		return -ENOMEM;
> +	data_ptr->val = val;
> +
>  	ret = hashmap__set(&ctx->ids, id, data_ptr,
>  			   (const void **)&old_key, (void **)&old_data);
>  	free(old_key);
> diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
> index 21fe5bd85718..ac32cda42006 100644
> --- a/tools/perf/util/expr.h
> +++ b/tools/perf/util/expr.h
> @@ -26,6 +26,7 @@ struct expr_scanner_ctx {
>  
>  void expr__ctx_init(struct expr_parse_ctx *ctx);
>  void expr__ctx_clear(struct expr_parse_ctx *ctx);
> +int expr__add_id(struct expr_parse_ctx *ctx, const char *id);
>  int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val);
>  int expr__get_id(struct expr_parse_ctx *ctx, const char *id, double *val_ptr);
>  int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index b2b3420ea6ec..8befe4a46f87 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -69,7 +69,7 @@ all_other: all_other other
>  
>  other: ID
>  {
> -	expr__add_id_val(ctx, $1, 0.0);
> +	expr__add_id(ctx, $1);
>  }
>  |
>  MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
> -- 
> 2.25.4
> 

-- 

- Arnaldo