#!/usr/bin/env python
"""Find Kconfig identifiers that are referenced but not defined."""
# (c) 2014 Valentin Rothberg <valentinrothberg@gmail.com>
# (c) 2014 Stefan Hengelein <stefan.hengelein@fau.de>
#
# Licensed under the terms of the GNU GPL License version 2
import os
import re
from subprocess import Popen, PIPE, STDOUT
# 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+\-]*$")
REGEX_FEATURE = re.compile(r"(" + FEATURE + r")")
REGEX_SOURCE_FEATURE = re.compile(SOURCE_FEATURE)
REGEX_KCONFIG_DEF = re.compile(DEF)
REGEX_KCONFIG_EXPR = re.compile(EXPR)
REGEX_KCONFIG_STMT = re.compile(STMT)
REGEX_KCONFIG_HELP = re.compile(r"^\s+(help|---help---)\s*$")
REGEX_FILTER_FEATURES = re.compile(r"[A-Za-z0-9]$")
def main():
"""Main function of this module."""
source_files = []
kconfig_files = []
defined_features = set()
referenced_features = dict() # {feature: [files]}
# use 'git ls-files' to get the worklist
pop = Popen("git ls-files", stdout=PIPE, stderr=STDOUT, shell=True)
(stdout, _) = pop.communicate() # wait until finished
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):
continue
if REGEX_FILE_KCONFIG.match(gitfile):
kconfig_files.append(gitfile)
else:
# all non-Kconfig files are checked for consistency
source_files.append(gitfile)
for sfile in source_files:
parse_source_file(sfile, referenced_features)
for kfile in kconfig_files:
parse_kconfig_file(kfile, defined_features, referenced_features)
print "Undefined symbol used\tFile list"
for feature in sorted(referenced_features):
# filter some false positives
if feature == "FOO" or feature == "BAR" or \
feature == "FOO_BAR" or feature == "XXX":
continue
if feature not in defined_features:
if feature.endswith("_MODULE"):
# avoid false positives for kernel modules
if feature[:-len("_MODULE")] in defined_features:
continue
files = referenced_features.get(feature)
print "%s\t%s" % (feature, ", ".join(files))
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:
continue
features = REGEX_SOURCE_FEATURE.findall(line)
for feature in features:
if not REGEX_FILTER_FEATURES.search(feature):
continue
sfiles = referenced_features.get(feature, set())
sfiles.add(sfile)
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)
defined_features.add(feature_def[0])
skip = False
elif REGEX_KCONFIG_HELP.match(line):
skip = True
elif skip:
# ignore content of help messages
pass
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')
features.extend(get_features_in_line(line))
for feature in set(features):
paths = referenced_features.get(feature, set())
paths.add(kfile)
referenced_features[feature] = paths
if __name__ == "__main__":
main()
