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

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Date:   Fri, 8 Oct 2021 16:01:08 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     James Clark <james.clark@....com>, john.garry@...wei.com,
        ak@...ux.intel.com, linux-perf-users@...r.kernel.org,
        Nick.Forrington@....com, Andrew.Kilroy@....com,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] perf tools: Make the JSON parser more conformant
 when in strict mode

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@....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@...hat.com>
> 
> So, is this for the whole patchset? b4 picked it just for this message.

Got it from IRC, thanks,

- Arnaldo