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run-clang-tidy
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Fri, Nov 1, 23:58

run-clang-tidy
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#!/usr/bin/env python3
#
#===- run-clang-tidy.py - Parallel clang-tidy runner --------*- python -*--===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===-----------------------------------------------------------------------===#
# FIXME: Integrate with clang-tidy-diff.py
"""
Parallel clang-tidy runner
==========================
Runs clang-tidy over all files in a compilation database. Requires clang-tidy
and clang-apply-replacements in $PATH.
Example invocations.
- Run clang-tidy on all files in the current working directory with a default
set of checks and show warnings in the cpp files and all project headers.
run-clang-tidy.py $PWD
- Fix all header guards.
run-clang-tidy.py -fix -checks=-*,llvm-header-guard
- Fix all header guards included from clang-tidy and header guards
for clang-tidy headers.
run-clang-tidy.py -fix -checks=-*,llvm-header-guard extra/clang-tidy \
-header-filter=extra/clang-tidy
Compilation database setup:
http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
"""
from __future__ import print_function
import argparse
import glob
import json
import multiprocessing
import os
import re
import shutil
import subprocess
import sys
import tempfile
import threading
import traceback
try:
import yaml
except ImportError:
yaml = None
is_py2 = sys.version[0] == '2'
if is_py2:
import Queue as queue
else:
import queue as queue
def find_compilation_database(path):
"""Adjusts the directory until a compilation database is found."""
result = './'
while not os.path.isfile(os.path.join(result, path)):
if os.path.realpath(result) == '/':
print('Error: could not find compilation database.')
sys.exit(1)
result += '../'
return os.path.realpath(result)
def make_absolute(f, directory):
if os.path.isabs(f):
return f
return os.path.normpath(os.path.join(directory, f))
def get_tidy_invocation(f, clang_tidy_binary, checks, tmpdir, build_path,
header_filter, allow_enabling_alpha_checkers,
extra_arg, extra_arg_before, quiet, config):
"""Gets a command line for clang-tidy."""
start = [clang_tidy_binary]
if allow_enabling_alpha_checkers:
start.append('-allow-enabling-analyzer-alpha-checkers')
if header_filter is not None:
start.append('-header-filter=' + header_filter)
if checks:
start.append('-checks=' + checks)
if tmpdir is not None:
start.append('-export-fixes')
# Get a temporary file. We immediately close the handle so clang-tidy can
# overwrite it.
(handle, name) = tempfile.mkstemp(suffix='.yaml', dir=tmpdir)
os.close(handle)
start.append(name)
for arg in extra_arg:
start.append('-extra-arg=%s' % arg)
for arg in extra_arg_before:
start.append('-extra-arg-before=%s' % arg)
start.append('-p=' + build_path)
if quiet:
start.append('-quiet')
if config:
start.append('-config=' + config)
start.append(f)
return start
def merge_replacement_files(tmpdir, mergefile):
"""Merge all replacement files in a directory into a single file"""
# The fixes suggested by clang-tidy >= 4.0.0 are given under
# the top level key 'Diagnostics' in the output yaml files
mergekey = "Diagnostics"
merged=[]
for replacefile in glob.iglob(os.path.join(tmpdir, '*.yaml')):
content = yaml.safe_load(open(replacefile, 'r'))
if not content:
continue # Skip empty files.
merged.extend(content.get(mergekey, []))
if merged:
# MainSourceFile: The key is required by the definition inside
# include/clang/Tooling/ReplacementsYaml.h, but the value
# is actually never used inside clang-apply-replacements,
# so we set it to '' here.
output = {'MainSourceFile': '', mergekey: merged}
with open(mergefile, 'w') as out:
yaml.safe_dump(output, out)
else:
# Empty the file:
open(mergefile, 'w').close()
def check_clang_apply_replacements_binary(args):
"""Checks if invoking supplied clang-apply-replacements binary works."""
try:
subprocess.check_call([args.clang_apply_replacements_binary, '--version'])
except:
print('Unable to run clang-apply-replacements. Is clang-apply-replacements '
'binary correctly specified?', file=sys.stderr)
traceback.print_exc()
sys.exit(1)
def apply_fixes(args, tmpdir):
"""Calls clang-apply-fixes on a given directory."""
invocation = [args.clang_apply_replacements_binary]
if args.format:
invocation.append('-format')
if args.style:
invocation.append('-style=' + args.style)
invocation.append(tmpdir)
subprocess.call(invocation)
def run_tidy(args, tmpdir, build_path, queue, lock, failed_files):
"""Takes filenames out of queue and runs clang-tidy on them."""
while True:
name = queue.get()
invocation = get_tidy_invocation(name, args.clang_tidy_binary, args.checks,
tmpdir, build_path, args.header_filter,
args.allow_enabling_alpha_checkers,
args.extra_arg, args.extra_arg_before,
args.quiet, args.config)
proc = subprocess.Popen(invocation, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, err = proc.communicate()
if proc.returncode != 0:
failed_files.append(name)
with lock:
sys.stdout.write(' '.join(invocation) + '\n' + output.decode('utf-8'))
if len(err) > 0:
sys.stdout.flush()
sys.stderr.write(err.decode('utf-8'))
queue.task_done()
def main():
parser = argparse.ArgumentParser(description='Runs clang-tidy over all files '
'in a compilation database. Requires '
'clang-tidy and clang-apply-replacements in '
'$PATH.')
parser.add_argument('-allow-enabling-alpha-checkers',
action='store_true', help='allow alpha checkers from '
'clang-analyzer.')
parser.add_argument('-clang-tidy-binary', metavar='PATH',
default='clang-tidy-11',
help='path to clang-tidy binary')
parser.add_argument('-clang-apply-replacements-binary', metavar='PATH',
default='clang-apply-replacements-11',
help='path to clang-apply-replacements binary')
parser.add_argument('-checks', default=None,
help='checks filter, when not specified, use clang-tidy '
'default')
parser.add_argument('-config', default=None,
help='Specifies a configuration in YAML/JSON format: '
' -config="{Checks: \'*\', '
' CheckOptions: [{key: x, '
' value: y}]}" '
'When the value is empty, clang-tidy will '
'attempt to find a file named .clang-tidy for '
'each source file in its parent directories.')
parser.add_argument('-header-filter', default=None,
help='regular expression matching the names of the '
'headers to output diagnostics from. Diagnostics from '
'the main file of each translation unit are always '
'displayed.')
if yaml:
parser.add_argument('-export-fixes', metavar='filename', dest='export_fixes',
help='Create a yaml file to store suggested fixes in, '
'which can be applied with clang-apply-replacements.')
parser.add_argument('-j', type=int, default=0,
help='number of tidy instances to be run in parallel.')
parser.add_argument('files', nargs='*', default=['.*'],
help='files to be processed (regex on path)')
parser.add_argument('-fix', action='store_true', help='apply fix-its')
parser.add_argument('-format', action='store_true', help='Reformat code '
'after applying fixes')
parser.add_argument('-style', default='file', help='The style of reformat '
'code after applying fixes')
parser.add_argument('-p', dest='build_path',
help='Path used to read a compile command database.')
parser.add_argument('-extra-arg', dest='extra_arg',
action='append', default=[],
help='Additional argument to append to the compiler '
'command line.')
parser.add_argument('-extra-arg-before', dest='extra_arg_before',
action='append', default=[],
help='Additional argument to prepend to the compiler '
'command line.')
parser.add_argument('-quiet', action='store_true',
help='Run clang-tidy in quiet mode')
args = parser.parse_args()
db_path = 'compile_commands.json'
if args.build_path is not None:
build_path = args.build_path
else:
# Find our database
build_path = find_compilation_database(db_path)
try:
invocation = [args.clang_tidy_binary, '-list-checks']
if args.allow_enabling_alpha_checkers:
invocation.append('-allow-enabling-analyzer-alpha-checkers')
invocation.append('-p=' + build_path)
if args.checks:
invocation.append('-checks=' + args.checks)
invocation.append('-')
if args.quiet:
# Even with -quiet we still want to check if we can call clang-tidy.
with open(os.devnull, 'w') as dev_null:
subprocess.check_call(invocation, stdout=dev_null)
else:
subprocess.check_call(invocation)
except:
print("Unable to run clang-tidy.", file=sys.stderr)
sys.exit(1)
# Load the database and extract all files.
database = json.load(open(os.path.join(build_path, db_path)))
files = [make_absolute(entry['file'], entry['directory'])
for entry in database]
max_task = args.j
if max_task == 0:
max_task = multiprocessing.cpu_count()
tmpdir = None
if args.fix or (yaml and args.export_fixes):
check_clang_apply_replacements_binary(args)
tmpdir = tempfile.mkdtemp()
# Build up a big regexy filter from all command line arguments.
file_name_re = re.compile('|'.join(args.files))
return_code = 0
try:
# Spin up a bunch of tidy-launching threads.
task_queue = queue.Queue(max_task)
# List of files with a non-zero return code.
failed_files = []
lock = threading.Lock()
for _ in range(max_task):
t = threading.Thread(target=run_tidy,
args=(args, tmpdir, build_path, task_queue, lock, failed_files))
t.daemon = True
t.start()
# Fill the queue with files.
for name in files:
if file_name_re.search(name):
task_queue.put(name)
# Wait for all threads to be done.
task_queue.join()
if len(failed_files):
return_code = 1
except KeyboardInterrupt:
# This is a sad hack. Unfortunately subprocess goes
# bonkers with ctrl-c and we start forking merrily.
print('\nCtrl-C detected, goodbye.')
if tmpdir:
shutil.rmtree(tmpdir)
os.kill(0, 9)
if yaml and args.export_fixes:
print('Writing fixes to ' + args.export_fixes + ' ...')
try:
merge_replacement_files(tmpdir, args.export_fixes)
except:
print('Error exporting fixes.\n', file=sys.stderr)
traceback.print_exc()
return_code=1
if args.fix:
print('Applying fixes ...')
try:
apply_fixes(args, tmpdir)
except:
print('Error applying fixes.\n', file=sys.stderr)
traceback.print_exc()
return_code = 1
if tmpdir:
shutil.rmtree(tmpdir)
sys.exit(return_code)
if __name__ == '__main__':
main()

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