[PATCHv3 0/5] perf expr: Add flex scanner

From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Michael Petlan <mpetlan@redhat.com>,
	Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
	Andi Kleen <ak@linux.intel.com>, Kajol Jain <kjain@linux.ibm.com>,
	John Garry <john.garry@huawei.com>
Subject: [PATCHv3 0/5] perf expr: Add flex scanner
Date: Fri, 28 Feb 2020 10:36:11 +0100	[thread overview]
Message-ID: <20200228093616.67125-1-jolsa@kernel.org> (raw)

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?

v3 changes:
  - keep the EXPR_MAX_OTHER not too high (Andi)
  - add normalize call to flexer, so we have all symbols covered [kajoljain]

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        | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/expr.y        | 185 +++++++++++++++++++++----------------------------------------------------------------------------------------------------
 tools/perf/util/stat-shadow.c |   4 +--
 7 files changed, 276 insertions(+), 168 deletions(-)
 create mode 100644 tools/perf/util/expr.c
 create mode 100644 tools/perf/util/expr.l