linux-kernel - Re: [PATCH 3/9] perf, tools: Add support for reading JSON event files v3

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Date:	Thu, 10 Jul 2014 00:20:07 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	acme@...radead.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 3/9] perf, tools: Add support for reading JSON event
 files v3

On Fri, Jun 27, 2014 at 04:15:58PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add a parser for Intel style JSON event files. This allows
> to use an Intel event list directly with perf. The Intel
> event lists can be quite large and are too big to store
> in unswappable kernel memory.
> 
> The parser code knows how to convert the JSON fields
> to perf fields. The conversion code is straight forward.
> It knows (very little) Intel specific information, and can be easily
> extended to handle fields for other CPUs.
> 
> The parser code is partially shared with an independent parsing
> library, which is 2-clause BSD licenced. To avoid any conflicts I marked
> those files as BSD licenced too. As part of perf they become GPLv2.

SNIP

> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <errno.h>
> +#include <string.h>
> +#include <ctype.h>
> +#include "jsmn.h"
> +#include "json.h"
> +#include "jevents.h"
> +
> +static void addfield(char *map, char **dst, const char *sep,
> +		     const char *a, jsmntok_t *bt)
> +{
> +	unsigned len = strlen(a) + 1 + strlen(sep);
> +	int olen = *dst ? strlen(*dst) : 0;
> +	int blen = bt ? json_len(bt) : 0;
> +	char *out;
> +
> +	out = realloc(*dst, len + olen + blen);
> +	if (!out)
> +		return;

what happens if we fail to realloc?

jirka
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