linux-kernel - Re: [PATCH v3 6/9] perf tools: add destructors for parse event terms

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Date:   Mon, 28 Oct 2019 20:33:08 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3 6/9] perf tools: add destructors for parse event terms

On Fri, Oct 25, 2019 at 09:08:34AM -0700, Ian Rogers wrote:
> On Fri, Oct 25, 2019 at 1:27 AM Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > On Thu, Oct 24, 2019 at 12:01:59PM -0700, Ian Rogers wrote:
> > > If parsing fails then destructors are ran to clean the up the stack.
> > > Rename the head union member to make the term and evlist use cases more
> > > distinct, this simplifies matching the correct destructor.
> >
> > nice did not know about this.. looks like it's been in bison for some time, right?
> 
> Looks like it wasn't in Bison 1 but in Bison 2, we're at Bison 3 and
> Bison 2 is > 14 years old:
> https://web.archive.org/web/20050924004158/http://www.gnu.org/software/bison/manual/html_mono/bison.html#Destructor-Decl

sounds safe ;-)

thanks,
jirka