linux-kernel - Re: [PATCH v1 01/18] gen_compile_commands: Allow the line prefix to still be cmd

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Date:   Mon, 25 Sep 2023 09:06:11 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nathan Chancellor <nathan@...nel.org>, Tom Rix <trix@...hat.com>,
        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>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ming Wang <wangming01@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Yuan Can <yuancan@...wei.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        James Clark <james.clark@....com>,
        Paolo Bonzini <pbonzini@...hat.com>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v1 01/18] gen_compile_commands: Allow the line prefix to
 still be cmd_

On Mon, Sep 25, 2023 at 8:49 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> On Fri, Sep 22, 2023 at 10:35 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Builds in tools still use the cmd_ prefix in .cmd files, so don't
> > require the saved part. Name the groups in the line pattern match so
>
> Is that something that can be changed in the tools/ Makefiles?
>
> I'm fine with this change, just curious where the difference comes
> from precisely.
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

I agree. The savedcmd_ change came from Masahiro in:
https://lore.kernel.org/lkml/20221229091501.916296-1-masahiroy@kernel.org/
I was reluctant to change the build logic in tools/ because of the
potential to break things. Maybe Masahiro/Nicolas know of issues?

Thanks,
Ian

>
> > that changing the regular expression is more robust and works with the
> > addition of a new match group.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  scripts/clang-tools/gen_compile_commands.py | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/scripts/clang-tools/gen_compile_commands.py b/scripts/clang-tools/gen_compile_commands.py
> > index a84cc5737c2c..b43f9149893c 100755
> > --- a/scripts/clang-tools/gen_compile_commands.py
> > +++ b/scripts/clang-tools/gen_compile_commands.py
> > @@ -19,7 +19,7 @@ _DEFAULT_OUTPUT = 'compile_commands.json'
> >  _DEFAULT_LOG_LEVEL = 'WARNING'
> >
> >  _FILENAME_PATTERN = r'^\..*\.cmd$'
> > -_LINE_PATTERN = r'^savedcmd_[^ ]*\.o := (.* )([^ ]*\.[cS]) *(;|$)'
> > +_LINE_PATTERN = r'^(saved)?cmd_[^ ]*\.o := (?P<command_prefix>.* )(?P<file_path>[^ ]*\.[cS]) *(;|$)'
> >  _VALID_LOG_LEVELS = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
> >  # The tools/ directory adopts a different build system, and produces .cmd
> >  # files in a different format. Do not support it.
> > @@ -213,8 +213,8 @@ def main():
> >                  result = line_matcher.match(f.readline())
> >                  if result:
> >                      try:
> > -                        entry = process_line(directory, result.group(1),
> > -                                             result.group(2))
> > +                        entry = process_line(directory, result.group('command_prefix'),
> > +                                             result.group('file_path'))
> >                          compile_commands.append(entry)
> >                      except ValueError as err:
> >                          logging.info('Could not add line from %s: %s',
> > --
> > 2.42.0.515.g380fc7ccd1-goog
> >
>
>
> --
> Thanks,
> ~Nick Desaulniers