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usr/src/linux-headers-5.4.0-200-generic/scripts/gen_compile_commands.py 0000755 00000013077 14722073335 0021513 0 ustar 00 #!/usr/bin/env python # SPDX-License-Identifier: GPL-2.0 # # Copyright (C) Google LLC, 2018 # # Author: Tom Roeder <tmroeder@google.com> # """A tool for generating compile_commands.json in the Linux kernel.""" import argparse import json import logging import os import re _DEFAULT_OUTPUT = 'compile_commands.json' _DEFAULT_LOG_LEVEL = 'WARNING' _FILENAME_PATTERN = r'^\..*\.cmd$' _LINE_PATTERN = r'^cmd_[^ ]*\.o := (.* )([^ ]*\.c)$' _VALID_LOG_LEVELS = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'] # A kernel build generally has over 2000 entries in its compile_commands.json # database. If this code finds 300 or fewer, then warn the user that they might # not have all the .cmd files, and they might need to compile the kernel. _LOW_COUNT_THRESHOLD = 300 def parse_arguments(): """Sets up and parses command-line arguments. Returns: log_level: A logging level to filter log output. directory: The directory to search for .cmd files. output: Where to write the compile-commands JSON file. """ usage = 'Creates a compile_commands.json database from kernel .cmd files' parser = argparse.ArgumentParser(description=usage) directory_help = ('Path to the kernel source directory to search ' '(defaults to the working directory)') parser.add_argument('-d', '--directory', type=str, help=directory_help) output_help = ('The location to write compile_commands.json (defaults to ' 'compile_commands.json in the search directory)') parser.add_argument('-o', '--output', type=str, help=output_help) log_level_help = ('The level of log messages to produce (one of ' + ', '.join(_VALID_LOG_LEVELS) + '; defaults to ' + _DEFAULT_LOG_LEVEL + ')') parser.add_argument( '--log_level', type=str, default=_DEFAULT_LOG_LEVEL, help=log_level_help) args = parser.parse_args() log_level = args.log_level if log_level not in _VALID_LOG_LEVELS: raise ValueError('%s is not a valid log level' % log_level) directory = args.directory or os.getcwd() output = args.output or os.path.join(directory, _DEFAULT_OUTPUT) directory = os.path.abspath(directory) return log_level, directory, output def process_line(root_directory, file_directory, command_prefix, relative_path): """Extracts information from a .cmd line and creates an entry from it. Args: root_directory: The directory that was searched for .cmd files. Usually used directly in the "directory" entry in compile_commands.json. file_directory: The path to the directory the .cmd file was found in. command_prefix: The extracted command line, up to the last element. relative_path: The .c file from the end of the extracted command. Usually relative to root_directory, but sometimes relative to file_directory and sometimes neither. Returns: An entry to append to compile_commands. Raises: ValueError: Could not find the extracted file based on relative_path and root_directory or file_directory. """ # The .cmd files are intended to be included directly by Make, so they # escape the pound sign '#', either as '\#' or '$(pound)' (depending on the # kernel version). The compile_commands.json file is not interepreted # by Make, so this code replaces the escaped version with '#'. prefix = command_prefix.replace('\#', '#').replace('$(pound)', '#') cur_dir = root_directory expected_path = os.path.join(cur_dir, relative_path) if not os.path.exists(expected_path): # Try using file_directory instead. Some of the tools have a different # style of .cmd file than the kernel. cur_dir = file_directory expected_path = os.path.join(cur_dir, relative_path) if not os.path.exists(expected_path): raise ValueError('File %s not in %s or %s' % (relative_path, root_directory, file_directory)) return { 'directory': cur_dir, 'file': relative_path, 'command': prefix + relative_path, } def main(): """Walks through the directory and finds and parses .cmd files.""" log_level, directory, output = 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 line in f: result = line_matcher.match(line) if not result: continue try: entry = process_line(directory, dirpath, 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) with open(output, 'wt') as f: json.dump(compile_commands, f, indent=2, sort_keys=True) count = len(compile_commands) if count < _LOW_COUNT_THRESHOLD: logging.warning( 'Found %s entries. Have you compiled the kernel?', count) if __name__ == '__main__': main()
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