linux-kernel - Re: [PATCH v2 6/9] gen_compile_commands: move directory walk to a generator function

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Date:   Fri, 21 Aug 2020 17:41:28 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nathan Huckleberry <nhuck@...gle.com>,
        Tom Roeder <tmroeder@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] gen_compile_commands: move directory walk to a
 generator function

On Fri, Aug 21, 2020 at 12:02 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Currently, this script walks under the specified directory (default to
> the current directory), then parses all .cmd files found.
>
> Split it into a separate helper function because the next commit will
> add more helpers to pick up .cmd files associated with given file(s).
>
> There is no point to build and return a huge list at once. I used a
> generator so it works in the for-loop with less memory.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
> Changes in v2:
>   - New patch
>
>  scripts/gen_compile_commands.py | 44 ++++++++++++++++++++++++---------
>  1 file changed, 32 insertions(+), 12 deletions(-)
>
> diff --git a/scripts/gen_compile_commands.py b/scripts/gen_compile_commands.py
> index 3ed958b64658..6dec7e2c4098 100755
> --- a/scripts/gen_compile_commands.py
> +++ b/scripts/gen_compile_commands.py
> @@ -33,6 +33,7 @@ def parse_arguments():
>          log_level: A logging level to filter log output.
>          directory: The work directory where the objects were built
>          output: Where to write the compile-commands JSON file.
> +        paths: The list of directories to handle to find .cmd files

Punctuation: please add a period.

>      """
>      usage = 'Creates a compile_commands.json database from kernel .cmd files'
>      parser = argparse.ArgumentParser(description=usage)
> @@ -56,7 +57,28 @@ def parse_arguments():
>
>      return (args.log_level,
>              os.path.abspath(args.directory),
> -            args.output)
> +            args.output,
> +            [args.directory])
> +
> +
> +def cmdfiles_in_dir(directory):
> +    """Generate the iterator of .cmd files found under the directory.
> +
> +    Walk under the given directory, and yield every .cmd file found.
> +
> +    Args:
> +        directory: The directory to search for .cmd files.
> +
> +    Yields:
> +        The path to a .cmd file.
> +    """
> +
> +    filename_matcher = re.compile(_FILENAME_PATTERN)
> +
> +    for dirpath, _, filenames in os.walk(directory):
> +        for filename in filenames:
> +            if filename_matcher.match(filename):
> +                yield os.path.join(dirpath, filename)
>
>
>  def process_line(root_directory, command_prefix, file_path):
> @@ -94,31 +116,29 @@ def process_line(root_directory, command_prefix, file_path):
>
>  def main():
>      """Walks through the directory and finds and parses .cmd files."""
> -    log_level, directory, output = parse_arguments()
> +    log_level, directory, output, paths = parse_arguments()
>
>      level = getattr(logging, log_level)
>      logging.basicConfig(format='%(levelname)s: %(message)s', level=level)
>
> -    filename_matcher = re.compile(_FILENAME_PATTERN)
>      line_matcher = re.compile(_LINE_PATTERN)
>
>      compile_commands = []
> -    for dirpath, _, filenames in os.walk(directory):
> -        for filename in filenames:
> -            if not filename_matcher.match(filename):
> -                continue
> -            filepath = os.path.join(dirpath, filename)
>
> -            with open(filepath, 'rt') as f:
> +    for path in paths:
> +        cmdfiles = cmdfiles_in_dir(path)
> +
> +        for cmdfile in cmdfiles:

If `cmdfiles` is never referenced again, please make this:

for cmdfile in cmdfiles_in_dir(path):

With those 2 changes feel free to add my
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> +            with open(cmdfile, 'rt') as f:
>                  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(1),
> +                                             result.group(2))
>                          compile_commands.append(entry)
>                      except ValueError as err:
>                          logging.info('Could not add line from %s: %s',
> -                                     filepath, err)
> +                                     cmdfile, err)
>
>      with open(output, 'wt') as f:
>          json.dump(compile_commands, f, indent=2, sort_keys=True)
> --
> 2.25.1
>


-- 
Thanks,
~Nick Desaulniers