246 lines
8.2 KiB
Python
Executable File
246 lines
8.2 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
# 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
|
|
import subprocess
|
|
import sys
|
|
|
|
_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']
|
|
# The tools/ directory adopts a different build system, and produces .cmd
|
|
# files in a different format. Do not support it.
|
|
_EXCLUDE_DIRS = ['.git', 'Documentation', 'include', 'tools']
|
|
|
|
def parse_arguments():
|
|
"""Sets up and parses command-line arguments.
|
|
|
|
Returns:
|
|
log_level: A logging level to filter log output.
|
|
directory: The work directory where the objects were built.
|
|
ar: Command used for parsing .a archives.
|
|
output: Where to write the compile-commands JSON file.
|
|
paths: The list of files/directories to handle to find .cmd files.
|
|
"""
|
|
usage = 'Creates a compile_commands.json database from kernel .cmd files'
|
|
parser = argparse.ArgumentParser(description=usage)
|
|
|
|
directory_help = ('specify the output directory used for the kernel build '
|
|
'(defaults to the working directory)')
|
|
parser.add_argument('-d', '--directory', type=str, default='.',
|
|
help=directory_help)
|
|
|
|
output_help = ('path to the output command database (defaults to ' +
|
|
_DEFAULT_OUTPUT + ')')
|
|
parser.add_argument('-o', '--output', type=str, default=_DEFAULT_OUTPUT,
|
|
help=output_help)
|
|
|
|
log_level_help = ('the level of log messages to produce (defaults to ' +
|
|
_DEFAULT_LOG_LEVEL + ')')
|
|
parser.add_argument('--log_level', choices=_VALID_LOG_LEVELS,
|
|
default=_DEFAULT_LOG_LEVEL, help=log_level_help)
|
|
|
|
ar_help = 'command used for parsing .a archives'
|
|
parser.add_argument('-a', '--ar', type=str, default='llvm-ar', help=ar_help)
|
|
|
|
paths_help = ('directories to search or files to parse '
|
|
'(files should be *.o, *.a, or modules.order). '
|
|
'If nothing is specified, the current directory is searched')
|
|
parser.add_argument('paths', type=str, nargs='*', help=paths_help)
|
|
|
|
args = parser.parse_args()
|
|
|
|
return (args.log_level,
|
|
os.path.abspath(args.directory),
|
|
args.output,
|
|
args.ar,
|
|
args.paths if len(args.paths) > 0 else [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)
|
|
exclude_dirs = [ os.path.join(directory, d) for d in _EXCLUDE_DIRS ]
|
|
|
|
for dirpath, dirnames, filenames in os.walk(directory, topdown=True):
|
|
# Prune unwanted directories.
|
|
if dirpath in exclude_dirs:
|
|
dirnames[:] = []
|
|
continue
|
|
|
|
for filename in filenames:
|
|
if filename_matcher.match(filename):
|
|
yield os.path.join(dirpath, filename)
|
|
|
|
|
|
def to_cmdfile(path):
|
|
"""Return the path of .cmd file used for the given build artifact
|
|
|
|
Args:
|
|
Path: file path
|
|
|
|
Returns:
|
|
The path to .cmd file
|
|
"""
|
|
dir, base = os.path.split(path)
|
|
return os.path.join(dir, '.' + base + '.cmd')
|
|
|
|
|
|
def cmdfiles_for_o(obj):
|
|
"""Generate the iterator of .cmd files associated with the object
|
|
|
|
Yield the .cmd file used to build the given object
|
|
|
|
Args:
|
|
obj: The object path
|
|
|
|
Yields:
|
|
The path to .cmd file
|
|
"""
|
|
yield to_cmdfile(obj)
|
|
|
|
|
|
def cmdfiles_for_a(archive, ar):
|
|
"""Generate the iterator of .cmd files associated with the archive.
|
|
|
|
Parse the given archive, and yield every .cmd file used to build it.
|
|
|
|
Args:
|
|
archive: The archive to parse
|
|
|
|
Yields:
|
|
The path to every .cmd file found
|
|
"""
|
|
for obj in subprocess.check_output([ar, '-t', archive]).decode().split():
|
|
yield to_cmdfile(obj)
|
|
|
|
|
|
def cmdfiles_for_modorder(modorder):
|
|
"""Generate the iterator of .cmd files associated with the modules.order.
|
|
|
|
Parse the given modules.order, and yield every .cmd file used to build the
|
|
contained modules.
|
|
|
|
Args:
|
|
modorder: The modules.order file to parse
|
|
|
|
Yields:
|
|
The path to every .cmd file found
|
|
"""
|
|
with open(modorder) as f:
|
|
for line in f:
|
|
ko = line.rstrip()
|
|
base, ext = os.path.splitext(ko)
|
|
if ext != '.ko':
|
|
sys.exit('{}: module path must end with .ko'.format(ko))
|
|
mod = base + '.mod'
|
|
# The first line of *.mod lists the objects that compose the module.
|
|
with open(mod) as m:
|
|
for obj in m.readline().split():
|
|
yield to_cmdfile(obj)
|
|
|
|
|
|
def process_line(root_directory, command_prefix, file_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.
|
|
command_prefix: The extracted command line, up to the last element.
|
|
file_path: The .c file from the end of the extracted command.
|
|
Usually relative to root_directory, but sometimes absolute.
|
|
|
|
Returns:
|
|
An entry to append to compile_commands.
|
|
|
|
Raises:
|
|
ValueError: Could not find the extracted file based on file_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)', '#')
|
|
|
|
# Use os.path.abspath() to normalize the path resolving '.' and '..' .
|
|
abs_path = os.path.abspath(os.path.join(root_directory, file_path))
|
|
if not os.path.exists(abs_path):
|
|
raise ValueError('File %s not found' % abs_path)
|
|
return {
|
|
'directory': root_directory,
|
|
'file': abs_path,
|
|
'command': prefix + file_path,
|
|
}
|
|
|
|
|
|
def main():
|
|
"""Walks through the directory and finds and parses .cmd files."""
|
|
log_level, directory, output, ar, paths = parse_arguments()
|
|
|
|
level = getattr(logging, log_level)
|
|
logging.basicConfig(format='%(levelname)s: %(message)s', level=level)
|
|
|
|
line_matcher = re.compile(_LINE_PATTERN)
|
|
|
|
compile_commands = []
|
|
|
|
for path in paths:
|
|
# If 'path' is a directory, handle all .cmd files under it.
|
|
# Otherwise, handle .cmd files associated with the file.
|
|
# Most of built-in objects are linked via archives (built-in.a or lib.a)
|
|
# but some objects are linked to vmlinux directly.
|
|
# Modules are listed in modules.order.
|
|
if os.path.isdir(path):
|
|
cmdfiles = cmdfiles_in_dir(path)
|
|
elif path.endswith('.o'):
|
|
cmdfiles = cmdfiles_for_o(path)
|
|
elif path.endswith('.a'):
|
|
cmdfiles = cmdfiles_for_a(path, ar)
|
|
elif path.endswith('modules.order'):
|
|
cmdfiles = cmdfiles_for_modorder(path)
|
|
else:
|
|
sys.exit('{}: unknown file type'.format(path))
|
|
|
|
for cmdfile in cmdfiles:
|
|
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))
|
|
compile_commands.append(entry)
|
|
except ValueError as err:
|
|
logging.info('Could not add line from %s: %s',
|
|
cmdfile, err)
|
|
|
|
with open(output, 'wt') as f:
|
|
json.dump(compile_commands, f, indent=2, sort_keys=True)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|