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