blob: 74086a583d8dddb4ecc2b880934de1a374069c48 [file] [log] [blame]
#!/usr/bin/env python
"""Find Kconfig symbols that are referenced but not defined."""
# (c) 2014-2015 Valentin Rothberg <>
# (c) 2014 Stefan Hengelein <>
# Licensed under the terms of the GNU GPL License version 2
import os
import re
import sys
from subprocess import Popen, PIPE, STDOUT
from optparse import OptionParser
# regex expressions
OPERATORS = r"&|\(|\)|\||\!"
FEATURE = r"(?:\w*[A-Z0-9]\w*){2,}"
DEF = r"^\s*(?:menu){,1}config\s+(" + FEATURE + r")\s*"
EXPR = r"(?:" + OPERATORS + r"|\s|" + FEATURE + r")+"
STMT = r"^\s*(?:if|select|depends\s+on)\s+" + EXPR
SOURCE_FEATURE = r"(?:\W|\b)+[D]{,1}CONFIG_(" + FEATURE + r")"
# regex objects
REGEX_FILE_KCONFIG = re.compile(r".*Kconfig[\.\w+\-]*$")
REGEX_FEATURE = re.compile(r"(" + FEATURE + r")")
REGEX_KCONFIG_HELP = re.compile(r"^\s+(help|---help---)\s*$")
REGEX_FILTER_FEATURES = re.compile(r"[A-Za-z0-9]$")
def parse_options():
"""The user interface of this module."""
usage = "%prog [options]\n\n" \
"Run this tool to detect Kconfig symbols that are referenced but " \
"not defined in\nKconfig. The output of this tool has the " \
"format \'Undefined symbol\\tFile list\'\n\n" \
"If no option is specified, %prog will default to check your\n" \
"current tree. Please note that specifying commits will " \
"\'git reset --hard\'\nyour current tree! You may save " \
"uncommitted changes to avoid losing data."
parser = OptionParser(usage=usage)
parser.add_option('-c', '--commit', dest='commit', action='store',
help="Check if the specified commit (hash) introduces "
"undefined Kconfig symbols.")
parser.add_option('-d', '--diff', dest='diff', action='store',
help="Diff undefined symbols between two commits. The "
"input format bases on Git log's "
parser.add_option('', '--force', dest='force', action='store_true',
help="Reset current Git tree even when it's dirty.")
(opts, _) = parser.parse_args()
if opts.commit and opts.diff:
sys.exit("Please specify only one option at once.")
if opts.diff and not re.match(r"^[\w\-\.]+\.\.[\w\-\.]+$", opts.diff):
sys.exit("Please specify valid input in the following format: "
if opts.commit or opts.diff:
if not opts.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 "
return opts
def main():
"""Main function of this module."""
opts = parse_options()
if opts.commit or opts.diff:
head = get_head()
# get commit range
commit_a = None
commit_b = None
if opts.commit:
commit_a = opts.commit + "~"
commit_b = opts.commit
elif opts.diff:
split = opts.diff.split("..")
commit_a = split[0]
commit_b = split[1]
undefined_a = {}
undefined_b = {}
# get undefined items before the commit
execute("git reset --hard %s" % commit_a)
undefined_a = check_symbols()
# get undefined items for the commit
execute("git reset --hard %s" % commit_b)
undefined_b = check_symbols()
# report cases that are present for the commit but not before
for feature in sorted(undefined_b):
# feature has not been undefined before
if not feature in undefined_a:
files = sorted(undefined_b.get(feature))
print "%s\t%s" % (feature, ", ".join(files))
# check if there are new files that reference the undefined feature
files = sorted(undefined_b.get(feature) -
if files:
print "%s\t%s" % (feature, ", ".join(files))
# reset to head
execute("git reset --hard %s" % head)
# default to check the entire tree
undefined = check_symbols()
for feature in sorted(undefined):
files = sorted(undefined.get(feature))
print "%s\t%s" % (feature, ", ".join(files))
def execute(cmd):
"""Execute %cmd and return stdout. Exit in case of error."""
pop = Popen(cmd, stdout=PIPE, stderr=STDOUT, shell=True)
(stdout, _) = pop.communicate() # wait until finished
if pop.returncode != 0:
return stdout
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 check_symbols():
"""Find undefined Kconfig symbols and return a dict with the symbol as key
and a list of referencing files as value."""
source_files = []
kconfig_files = []
defined_features = set()
referenced_features = dict() # {feature: [files]}
# use 'git ls-files' to get the worklist
stdout = execute("git ls-files")
if len(stdout) > 0 and stdout[-1] == "\n":
stdout = stdout[:-1]
for gitfile in stdout.rsplit("\n"):
if ".git" in gitfile or "ChangeLog" in gitfile or \
".log" in gitfile or os.path.isdir(gitfile) or \
if REGEX_FILE_KCONFIG.match(gitfile):
# all non-Kconfig files are checked for consistency
for sfile in source_files:
parse_source_file(sfile, referenced_features)
for kfile in kconfig_files:
parse_kconfig_file(kfile, defined_features, referenced_features)
undefined = {} # {feature: [files]}
for feature in sorted(referenced_features):
# filter some false positives
if feature == "FOO" or feature == "BAR" or \
feature == "FOO_BAR" or feature == "XXX":
if feature not in defined_features:
if feature.endswith("_MODULE"):
# avoid false positives for kernel modules
if feature[:-len("_MODULE")] in defined_features:
undefined[feature] = referenced_features.get(feature)
return undefined
def parse_source_file(sfile, referenced_features):
"""Parse @sfile for referenced Kconfig features."""
lines = []
with open(sfile, "r") as stream:
lines = stream.readlines()
for line in lines:
if not "CONFIG_" in line:
features = REGEX_SOURCE_FEATURE.findall(line)
for feature in features:
if not
sfiles = referenced_features.get(feature, set())
referenced_features[feature] = sfiles
def get_features_in_line(line):
"""Return mentioned Kconfig features in @line."""
return REGEX_FEATURE.findall(line)
def parse_kconfig_file(kfile, defined_features, referenced_features):
"""Parse @kfile and update feature definitions and references."""
lines = []
skip = False
with open(kfile, "r") 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):
feature_def = REGEX_KCONFIG_DEF.findall(line)
skip = False
elif REGEX_KCONFIG_HELP.match(line):
skip = True
elif skip:
# ignore content of help messages
elif REGEX_KCONFIG_STMT.match(line):
features = get_features_in_line(line)
# multi-line statements
while line.endswith("\\"):
i += 1
line = lines[i]
line = line.strip('\n')
for feature in set(features):
paths = referenced_features.get(feature, set())
referenced_features[feature] = paths
if __name__ == "__main__":