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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-only
"""Find Kconfig symbols that are referenced but not defined."""
# (c) 2014-2017 Valentin Rothberg <valentinrothberg@gmail.com>
# (c) 2014 Stefan Hengelein <stefan.hengelein@fau.de>
#
import argparse
import difflib
import os
import re
import signal
import subprocess
import sys
from multiprocessing import Pool, cpu_count
# regex expressions
OPERATORS = r"&|\(|\)|\||\!"
SYMBOL = r"(?:\w*[A-Z0-9]\w*){2,}"
DEF = r"^\s*(?:menu){,1}config\s+(" + SYMBOL + r")\s*"
EXPR = r"(?:" + OPERATORS + r"|\s|" + SYMBOL + r")+"
DEFAULT = r"default\s+.*?(?:if\s.+){,1}"
STMT = r"^\s*(?:if|select|imply|depends\s+on|(?:" + DEFAULT + r"))\s+" + EXPR
SOURCE_SYMBOL = r"(?:\W|\b)+[D]{,1}CONFIG_(" + SYMBOL + r")"
# regex objects
REGEX_FILE_KCONFIG = re.compile(r".*Kconfig[\.\w+\-]*$")
REGEX_SYMBOL = re.compile(r'(?!\B)' + SYMBOL + r'(?!\B)')
REGEX_SOURCE_SYMBOL = re.compile(SOURCE_SYMBOL)
REGEX_KCONFIG_DEF = re.compile(DEF)
REGEX_KCONFIG_EXPR = re.compile(EXPR)
REGEX_KCONFIG_STMT = re.compile(STMT)
REGEX_FILTER_SYMBOLS = re.compile(r"[A-Za-z0-9]$")
REGEX_NUMERIC = re.compile(r"0[xX][0-9a-fA-F]+|[0-9]+")
REGEX_QUOTES = re.compile("(\"(.*?)\")")
def parse_options():
"""The user interface of this module."""
usage = "Run this tool to detect Kconfig symbols that are referenced but " \
"not defined in Kconfig. If no option is specified, " \
"checkkconfigsymbols defaults to check your current tree. " \
"Please note that specifying commits will 'git reset --hard\' " \
"your current tree! You may save uncommitted changes to avoid " \
"losing data."
parser = argparse.ArgumentParser(description=usage)
parser.add_argument('-c', '--commit', dest='commit', action='store',
default="",
help="check if the specified commit (hash) introduces "
"undefined Kconfig symbols")
parser.add_argument('-d', '--diff', dest='diff', action='store',
default="",
help="diff undefined symbols between two commits "
"(e.g., -d commmit1..commit2)")
parser.add_argument('-f', '--find', dest='find', action='store_true',
default=False,
help="find and show commits that may cause symbols to be "
"missing (required to run with --diff)")
parser.add_argument('-i', '--ignore', dest='ignore', action='store',
default="",
help="ignore files matching this Python regex "
"(e.g., -i '.*defconfig')")
parser.add_argument('-s', '--sim', dest='sim', action='store', default="",
help="print a list of max. 10 string-similar symbols")
parser.add_argument('--force', dest='force', action='store_true',
default=False,
help="reset current Git tree even when it's dirty")
parser.add_argument('--no-color', dest='color', action='store_false',
default=True,
help="don't print colored output (default when not "
"outputting to a terminal)")
args = parser.parse_args()
if args.commit and args.diff:
sys.exit("Please specify only one option at once.")
if args.diff and not re.match(r"^[\w\-\.\^]+\.\.[\w\-\.\^]+$", args.diff):
sys.exit("Please specify valid input in the following format: "
"\'commit1..commit2\'")
if args.commit or args.diff:
if not args.force and tree_is_dirty():
sys.exit("The current Git tree is dirty (see 'git status'). "
"Running this script may\ndelete important data since it "
"calls 'git reset --hard' for some performance\nreasons. "
" Please run this script in a clean Git tree or pass "
"'--force' if you\nwant to ignore this warning and "
"continue.")
if args.commit:
if args.commit.startswith('HEAD'):
sys.exit("The --commit option can't use the HEAD ref")
args.find = False
if args.ignore:
try:
re.match(args.ignore, "this/is/just/a/test.c")
except:
sys.exit("Please specify a valid Python regex.")
return args
def print_undefined_symbols():
"""Main function of this module."""
args = parse_options()
global COLOR
COLOR = args.color and sys.stdout.isatty()
if args.sim and not args.commit and not args.diff:
sims = find_sims(args.sim, args.ignore)
if sims:
print("%s: %s" % (yel("Similar symbols"), ', '.join(sims)))
else:
print("%s: no similar symbols found" % yel("Similar symbols"))
sys.exit(0)
# dictionary of (un)defined symbols
defined = {}
undefined = {}
if args.commit or args.diff:
head = get_head()
# get commit range
commit_a = None
commit_b = None
if args.commit:
commit_a = args.commit + "~"
commit_b = args.commit
elif args.diff:
split = args.diff.split("..")
commit_a = split[0]
commit_b = split[1]
undefined_a = {}
undefined_b = {}
# get undefined items before the commit
reset(commit_a)
undefined_a, _ = check_symbols(args.ignore)
# get undefined items for the commit
reset(commit_b)
undefined_b, defined = check_symbols(args.ignore)
# report cases that are present for the commit but not before
for symbol in sorted(undefined_b):
# symbol has not been undefined before
if symbol not in undefined_a:
files = sorted(undefined_b.get(symbol))
undefined[symbol] = files
# check if there are new files that reference the undefined symbol
else:
files = sorted(undefined_b.get(symbol) -
undefined_a.get(symbol))
if files:
undefined[symbol] = files
# reset to head
reset(head)
# default to check the entire tree
else:
undefined, defined = check_symbols(args.ignore)
# now print the output
for symbol in sorted(undefined):
print(red(symbol))
files = sorted(undefined.get(symbol))
print("%s: %s" % (yel("Referencing files"), ", ".join(files)))
sims = find_sims(symbol, args.ignore, defined)
sims_out = yel("Similar symbols")
if sims:
print("%s: %s" % (sims_out, ', '.join(sims)))
else:
print("%s: %s" % (sims_out, "no similar symbols found"))
if args.find:
print("%s:" % yel("Commits changing symbol"))
commits = find_commits(symbol, args.diff)
if commits:
for commit in commits:
commit = commit.split(" ", 1)
print("\t- %s (\"%s\")" % (yel(commit[0]), commit[1]))
else:
print("\t- no commit found")
print() # new line
def reset(commit):
"""Reset current git tree to %commit."""
execute(["git", "reset", "--hard", commit])
def yel(string):
"""
Color %string yellow.
"""
return "\033[33m%s\033[0m" % string if COLOR else string
def red(string):
"""
Color %string red.
"""
return "\033[31m%s\033[0m" % string if COLOR else string
def execute(cmd):
"""Execute %cmd and return stdout. Exit in case of error."""
try:
stdout = subprocess.check_output(cmd, stderr=subprocess.STDOUT, shell=False)
stdout = stdout.decode(errors='replace')
except subprocess.CalledProcessError as fail:
exit(fail)
return stdout
def find_commits(symbol, diff):
"""Find commits changing %symbol in the given range of %diff."""
commits = execute(["git", "log", "--pretty=oneline",
"--abbrev-commit", "-G",
symbol, diff])
return [x for x in commits.split("\n") if x]
def tree_is_dirty():
"""Return true if the current working tree is dirty (i.e., if any file has
been added, deleted, modified, renamed or copied but not committed)."""
stdout = execute(["git", "status", "--porcelain"])
for line in stdout:
if re.findall(r"[URMADC]{1}", line[:2]):
return True
return False
def get_head():
"""Return commit hash of current HEAD."""
stdout = execute(["git", "rev-parse", "HEAD"])
return stdout.strip('\n')
def partition(lst, size):
"""Partition list @lst into eveni-sized lists of size @size."""
return [lst[i::size] for i in range(size)]
def init_worker():
"""Set signal handler to ignore SIGINT."""
signal.signal(signal.SIGINT, signal.SIG_IGN)
def find_sims(symbol, ignore, defined=[]):
"""Return a list of max. ten Kconfig symbols that are string-similar to
@symbol."""
if defined:
return difflib.get_close_matches(symbol, set(defined), 10)
pool = Pool(cpu_count(), init_worker)
kfiles = []
for gitfile in get_files():
if REGEX_FILE_KCONFIG.match(gitfile):
kfiles.append(gitfile)
arglist = []
for part in partition(kfiles, cpu_count()):
arglist.append((part, ignore))
for res in pool.map(parse_kconfig_files, arglist):
defined.extend(res[0])
return difflib.get_close_matches(symbol, set(defined), 10)
def get_files():
"""Return a list of all files in the current git directory."""
# use 'git ls-files' to get the worklist
stdout = execute(["git", "ls-files"])
if len(stdout) > 0 and stdout[-1] == "\n":
stdout = stdout[:-1]
files = []
for gitfile in stdout.rsplit("\n"):
if ".git" in gitfile or "ChangeLog" in gitfile or \
".log" in gitfile or os.path.isdir(gitfile) or \
gitfile.startswith("tools/"):
continue
files.append(gitfile)
return files
def check_symbols(ignore):
"""Find undefined Kconfig symbols and return a dict with the symbol as key
and a list of referencing files as value. Files matching %ignore are not
checked for undefined symbols."""
pool = Pool(cpu_count(), init_worker)
try:
return check_symbols_helper(pool, ignore)
except KeyboardInterrupt:
pool.terminate()
pool.join()
sys.exit(1)
def check_symbols_helper(pool, ignore):
"""Helper method for check_symbols(). Used to catch keyboard interrupts in
check_symbols() in order to properly terminate running worker processes."""
source_files = []
kconfig_files = []
defined_symbols = []
referenced_symbols = dict() # {file: [symbols]}
for gitfile in get_files():
if REGEX_FILE_KCONFIG.match(gitfile):
kconfig_files.append(gitfile)
else:
if ignore and re.match(ignore, gitfile):
continue
# add source files that do not match the ignore pattern
source_files.append(gitfile)
# parse source files
arglist = partition(source_files, cpu_count())
for res in pool.map(parse_source_files, arglist):
referenced_symbols.update(res)
# parse kconfig files
arglist = []
for part in partition(kconfig_files, cpu_count()):
arglist.append((part, ignore))
for res in pool.map(parse_kconfig_files, arglist):
defined_symbols.extend(res[0])
referenced_symbols.update(res[1])
defined_symbols = set(defined_symbols)
# inverse mapping of referenced_symbols to dict(symbol: [files])
inv_map = dict()
for _file, symbols in referenced_symbols.items():
for symbol in symbols:
inv_map[symbol] = inv_map.get(symbol, set())
inv_map[symbol].add(_file)
referenced_symbols = inv_map
undefined = {} # {symbol: [files]}
for symbol in sorted(referenced_symbols):
# filter some false positives
if symbol == "FOO" or symbol == "BAR" or \
symbol == "FOO_BAR" or symbol == "XXX":
continue
if symbol not in defined_symbols:
if symbol.endswith("_MODULE"):
# avoid false positives for kernel modules
if symbol[:-len("_MODULE")] in defined_symbols:
continue
undefined[symbol] = referenced_symbols.get(symbol)
return undefined, defined_symbols
def parse_source_files(source_files):
"""Parse each source file in @source_files and return dictionary with source
files as keys and lists of references Kconfig symbols as values."""
referenced_symbols = dict()
for sfile in source_files:
referenced_symbols[sfile] = parse_source_file(sfile)
return referenced_symbols
def parse_source_file(sfile):
"""Parse @sfile and return a list of referenced Kconfig symbols."""
lines = []
references = []
if not os.path.exists(sfile):
return references
with open(sfile, "r", encoding='utf-8', errors='replace') as stream:
lines = stream.readlines()
for line in lines:
if "CONFIG_" not in line:
continue
symbols = REGEX_SOURCE_SYMBOL.findall(line)
for symbol in symbols:
if not REGEX_FILTER_SYMBOLS.search(symbol):
continue
references.append(symbol)
return references
def get_symbols_in_line(line):
"""Return mentioned Kconfig symbols in @line."""
return REGEX_SYMBOL.findall(line)
def parse_kconfig_files(args):
"""Parse kconfig files and return tuple of defined and references Kconfig
symbols. Note, @args is a tuple of a list of files and the @ignore
pattern."""
kconfig_files = args[0]
ignore = args[1]
defined_symbols = []
referenced_symbols = dict()
for kfile in kconfig_files:
defined, references = parse_kconfig_file(kfile)
defined_symbols.extend(defined)
if ignore and re.match(ignore, kfile):
# do not collect references for files that match the ignore pattern
continue
referenced_symbols[kfile] = references
return (defined_symbols, referenced_symbols)
def parse_kconfig_file(kfile):
"""Parse @kfile and update symbol definitions and references."""
lines = []
defined = []
references = []
if not os.path.exists(kfile):
return defined, references
with open(kfile, "r", encoding='utf-8', errors='replace') as stream:
lines = stream.readlines()
for i in range(len(lines)):
line = lines[i]
line = line.strip('\n')
line = line.split("#")[0] # ignore comments
if REGEX_KCONFIG_DEF.match(line):
symbol_def = REGEX_KCONFIG_DEF.findall(line)
defined.append(symbol_def[0])
elif REGEX_KCONFIG_STMT.match(line):
line = REGEX_QUOTES.sub("", line)
symbols = get_symbols_in_line(line)
# multi-line statements
while line.endswith("\\"):
i += 1
line = lines[i]
line = line.strip('\n')
symbols.extend(get_symbols_in_line(line))
for symbol in set(symbols):
if REGEX_NUMERIC.match(symbol):
# ignore numeric values
continue
references.append(symbol)
return defined, references
def main():
try:
print_undefined_symbols()
except BrokenPipeError:
# Python flushes standard streams on exit; redirect remaining output
# to devnull to avoid another BrokenPipeError at shutdown
devnull = os.open(os.devnull, os.O_WRONLY)
os.dup2(devnull, sys.stdout.fileno())
sys.exit(1) # Python exits with error code 1 on EPIPE
if __name__ == "__main__":
main()
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