Re: [PATCH 2/3] perf tools: Make the JSON parser more conformant when in strict mode

From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: James Clark <james.clark@arm.com>,
	john.garry@huawei.com, ak@linux.intel.com,
	linux-perf-users@vger.kernel.org, Nick.Forrington@arm.com,
	Andrew.Kilroy@arm.com, Will Deacon <will@kernel.org>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Leo Yan <leo.yan@linaro.org>, Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] perf tools: Make the JSON parser more conformant when in strict mode
Date: Fri, 8 Oct 2021 16:01:08 -0300	[thread overview]
Message-ID: <YWCVdJ1AlbEgDcjW@kernel.org> (raw)
In-Reply-To: <YWCUWo6pMns6p05o@kernel.org>

Em Fri, Oct 08, 2021 at 03:56:26PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Oct 08, 2021 at 03:12:03PM +0200, Jiri Olsa escreveu:
> > On Fri, Oct 08, 2021 at 11:08:25AM +0100, James Clark wrote:
> > > 
> > > 
> > > On 07/10/2021 18:52, Jiri Olsa wrote:
> > > > On Thu, Oct 07, 2021 at 12:05:41PM +0100, James Clark wrote:
> > > >> Return an error when a trailing comma is found or a new item is
> > > >> encountered before a comma or an opening brace. This ensures that the
> > > >> perf json files conform more closely to the spec at https://www.json.org
> > > >>
> > > >> Signed-off-by: James Clark <james.clark@arm.com>
> > > >> ---
> > > >>  tools/perf/pmu-events/jsmn.c | 42 ++++++++++++++++++++++++++++++++++--
> > > >>  1 file changed, 40 insertions(+), 2 deletions(-)
> > > >>
> > > >> diff --git a/tools/perf/pmu-events/jsmn.c b/tools/perf/pmu-events/jsmn.c
> > > >> index 11d1fa18bfa5..8124d2d3ff0c 100644
> > > >> --- a/tools/perf/pmu-events/jsmn.c
> > > >> +++ b/tools/perf/pmu-events/jsmn.c
> > > >> @@ -176,6 +176,14 @@ jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
> > > >>  	jsmnerr_t r;
> > > >>  	int i;
> > > >>  	jsmntok_t *token;
> > > >> +#ifdef JSMN_STRICT
> > > > 
> > > > I might have missed some discussion on this, but do we need the
> > > > JSMN_STRICT define, if you enable it in the next patch?
> > > > why can't we be more strict by default.. do you plan to disable
> > > > it in future?
> > > 
> > > I didn't plan on disabling it, I was just trying to keep to the existing style of the
> > > jsmn project.
> > > 
> > > I could have added the trailing comma detection by default and not inside any
> > > #ifdef JSMN_STRICT blocks, but I would like to enable JSMN_STRICT anyway, because it
> > > enables some additional built in checking that was already there. So I thought it
> > > made sense to put my new strict stuff inside the existing strict option.
> > > 
> > > One option would be to remove all (including the existing) #ifdef JSMN_STRICT blocks
> > > and have everything strict by default. But it would be a further deviation from jsmn.
> > 
> > ok, I think it makes sense to have JSMN_STRICT then..
> > thanks for explanation
> > 
> > Acked-by: Jiri Olsa <jolsa@redhat.com>
> 
> So, is this for the whole patchset? b4 picked it just for this message.

Got it from IRC, thanks,

- Arnaldo