linux-kernel - [RFC 0/4] perf expr: Add flex scanner

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Message-Id: <20200221231935.735145-1-jolsa@kernel.org>
Date:   Sat, 22 Feb 2020 00:19:31 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     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: [RFC 0/4] perf expr: Add flex scanner

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?


Available also in:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/metric_flex

thanks,
jirka


---
Jiri Olsa (4):
      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

 tools/perf/tests/expr.c       |   6 ++--
 tools/perf/util/Build         |  11 +++++++-
 tools/perf/util/expr.c        | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/expr.h        |   8 ++----
 tools/perf/util/expr.l        |  83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/expr.y        | 185 +++++++++++++++++++++----------------------------------------------------------------------------------------------------
 tools/perf/util/stat-shadow.c |   4 +--
 7 files changed, 242 insertions(+), 166 deletions(-)
 create mode 100644 tools/perf/util/expr.c
 create mode 100644 tools/perf/util/expr.l