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 08:49:17 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Ian Rogers <irogers@...gle.com>
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 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>

> 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