linux-kernel - Re: [PATCHv2 0/5] perf expr: Add flex scanner

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Date:   Thu, 27 Feb 2020 13:10:00 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCHv2 0/5] perf expr: Add flex scanner

On Mon, Feb 24, 2020 at 09:29:13AM +0100, Jiri Olsa wrote:
> hi,
> while preparing changes for user defined metric expressions
> I also moved the expression manual parser to flex.
> 
> The reason is to have an easy and reasonable way to support
> and parse multiple user-defined metric expressions from
> command line or file.
> 
> I was posponing the change, but I just saw another update to
> the expr manual scanner (from Kajol Jain), so cherry picked
> just the expr flex code changes to get it out.
> 
> Kajol Jain,
> I think it should ease up your change for unknown values marked
> by '?'. Would you consider rebasing your changes on top of this?
> 
> 

kajoljain found and issue in this one, I'll send v3 as
soon as he confirms the fix

jirka


> v2 changes:
>   - handle special chars properly
>   - fix return value for expr__parse
> 
> Available also in:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   perf/metric_flex
> 
> thanks,
> jirka
> 
> 
> ---
> Jiri Olsa (5):
>       perf expr: Add expr.c object
>       perf expr: Move expr lexer to flex
>       perf expr: Increase EXPR_MAX_OTHER
>       perf expr: Straighten expr__parse/expr__find_other interface
>       perf expr: Make expr__parse return -1 on error
> 
>  tools/perf/tests/expr.c       |  10 +++---
>  tools/perf/util/Build         |  11 ++++++-
>  tools/perf/util/expr.c        | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/expr.h        |   8 ++---
>  tools/perf/util/expr.l        |  87 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/expr.y        | 208 ++++++++++++++++++++++++++++++++-----------------------------------------------------------------------------------------
>  tools/perf/util/stat-shadow.c |   4 +--
>  7 files changed, 272 insertions(+), 168 deletions(-)
>  create mode 100644 tools/perf/util/expr.c
>  create mode 100644 tools/perf/util/expr.l
>