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#!/usr/bin/env python |
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# |
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#===- run-clang-tidy.py - Parallel clang-tidy runner ---------*- python -*--===# |
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# |
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# The LLVM Compiler Infrastructure |
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# |
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# This file is distributed under the University of Illinois Open Source |
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# License. See LICENSE.TXT for details. |
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# |
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#===------------------------------------------------------------------------===# |
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# FIXME: Integrate with clang-tidy-diff.py |
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""" |
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Parallel clang-tidy runner |
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========================== |
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Runs clang-tidy over all files in a compilation database. Requires clang-tidy |
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and clang-apply-replacements in $PATH. |
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Example invocations. |
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- Run clang-tidy on all files in the current working directory with a default |
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set of checks and show warnings in the cpp files and all project headers. |
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run-clang-tidy.py $PWD |
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- Fix all header guards. |
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run-clang-tidy.py -fix -checks=-*,llvm-header-guard |
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- Fix all header guards included from clang-tidy and header guards |
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for clang-tidy headers. |
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run-clang-tidy.py -fix -checks=-*,llvm-header-guard extra/clang-tidy \ |
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-header-filter=extra/clang-tidy |
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Compilation database setup: |
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http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html |
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""" |
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from __future__ import print_function |
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import argparse |
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import glob |
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import json |
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import multiprocessing |
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import os |
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import re |
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import shutil |
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import subprocess |
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import sys |
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import tempfile |
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import threading |
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import traceback |
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import yaml |
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is_py2 = sys.version[0] == '2' |
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if is_py2: |
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import Queue as queue |
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else: |
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import queue as queue |
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def find_compilation_database(path): |
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"""Adjusts the directory until a compilation database is found.""" |
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result = './' |
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while not os.path.isfile(os.path.join(result, path)): |
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if os.path.realpath(result) == '/': |
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print('Error: could not find compilation database.') |
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sys.exit(1) |
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result += '../' |
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return os.path.realpath(result) |
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def make_absolute(f, directory): |
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if os.path.isabs(f): |
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return f |
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return os.path.normpath(os.path.join(directory, f)) |
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def get_tidy_invocation(f, clang_tidy_binary, checks, tmpdir, build_path, |
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header_filter, extra_arg, extra_arg_before, quiet): |
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"""Gets a command line for clang-tidy.""" |
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start = [clang_tidy_binary] |
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if header_filter is not None: |
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start.append('-header-filter=' + header_filter) |
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else: |
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# Show warnings in all in-project headers by default. |
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start.append('-header-filter=^' + build_path + '/.*') |
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if checks: |
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start.append('-checks=' + checks) |
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if tmpdir is not None: |
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start.append('-export-fixes') |
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# Get a temporary file. We immediately close the handle so clang-tidy can |
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# overwrite it. |
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(handle, name) = tempfile.mkstemp(suffix='.yaml', dir=tmpdir) |
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os.close(handle) |
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start.append(name) |
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for arg in extra_arg: |
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start.append('-extra-arg=%s' % arg) |
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for arg in extra_arg_before: |
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start.append('-extra-arg-before=%s' % arg) |
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start.append('-p=' + build_path) |
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if quiet: |
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start.append('-quiet') |
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start.append(f) |
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return start |
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def merge_replacement_files(tmpdir, mergefile): |
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"""Merge all replacement files in a directory into a single file""" |
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# The fixes suggested by clang-tidy >= 4.0.0 are given under |
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# the top level key 'Diagnostics' in the output yaml files |
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mergekey="Diagnostics" |
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merged=[] |
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for replacefile in glob.iglob(os.path.join(tmpdir, '*.yaml')): |
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content = yaml.safe_load(open(replacefile, 'r')) |
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if not content: |
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continue # Skip empty files. |
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merged.extend(content.get(mergekey, [])) |
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if merged: |
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# MainSourceFile: The key is required by the definition inside |
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# include/clang/Tooling/ReplacementsYaml.h, but the value |
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# is actually never used inside clang-apply-replacements, |
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# so we set it to '' here. |
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output = { 'MainSourceFile': '', mergekey: merged } |
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with open(mergefile, 'w') as out: |
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yaml.safe_dump(output, out) |
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else: |
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# Empty the file: |
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open(mergefile, 'w').close() |
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def check_clang_apply_replacements_binary(args): |
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"""Checks if invoking supplied clang-apply-replacements binary works.""" |
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try: |
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subprocess.check_call([args.clang_apply_replacements_binary, '--version']) |
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except: |
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print('Unable to run clang-apply-replacements. Is clang-apply-replacements ' |
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'binary correctly specified?', file=sys.stderr) |
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traceback.print_exc() |
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sys.exit(1) |
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def apply_fixes(args, tmpdir): |
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"""Calls clang-apply-fixes on a given directory.""" |
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invocation = [args.clang_apply_replacements_binary] |
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if args.format: |
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invocation.append('-format') |
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if args.style: |
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invocation.append('-style=' + args.style) |
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invocation.append(tmpdir) |
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subprocess.call(invocation) |
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def run_tidy(args, tmpdir, build_path, queue, write_to_file_queue): |
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"""Takes filenames out of queue and runs clang-tidy on them.""" |
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while True: |
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name = queue.get() |
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invocation = get_tidy_invocation(name, args.clang_tidy_binary, args.checks, |
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tmpdir, build_path, args.header_filter, |
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args.extra_arg, args.extra_arg_before, |
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args.quiet) |
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sys.stdout.write(' '.join(invocation) + '\n') |
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stdout = subprocess.check_output(invocation) |
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if args.output_file is not None: |
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write_to_file_queue.put(stdout) |
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queue.task_done() |
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# based on https://stackoverflow.com/a/11984760 |
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class WriteToFileThread(threading.Thread): |
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def __init__(self, filename, queue): |
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threading.Thread.__init__(self) |
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self.queue = queue |
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self.filename = filename |
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def run(self): |
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while True: |
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output = self.queue.get() |
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sys.stdout.write(output) |
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f = open(self.filename, 'a') |
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f.write(output) |
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f.close() |
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self.queue.task_done() |
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def main(): |
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parser = argparse.ArgumentParser(description='Runs clang-tidy over all files ' |
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'in a compilation database. Requires ' |
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'clang-tidy and clang-apply-replacements in ' |
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'$PATH.') |
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parser.add_argument('-clang-tidy-binary', metavar='PATH', |
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default='clang-tidy', |
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help='path to clang-tidy binary') |
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parser.add_argument('-clang-apply-replacements-binary', metavar='PATH', |
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default='clang-apply-replacements', |
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help='path to clang-apply-replacements binary') |
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parser.add_argument('-checks', default=None, |
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help='checks filter, when not specified, use clang-tidy ' |
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'default') |
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parser.add_argument('-header-filter', default=None, |
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help='regular expression matching the names of the ' |
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'headers to output diagnostics from. Diagnostics from ' |
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'the main file of each translation unit are always ' |
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'displayed.') |
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parser.add_argument('-export-fixes', metavar='filename', dest='export_fixes', |
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help='Create a yaml file to store suggested fixes in, ' |
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'which can be applied with clang-apply-replacements.') |
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parser.add_argument('-j', type=int, default=0, |
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help='number of tidy instances to be run in parallel.') |
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parser.add_argument('files', nargs='*', default=['.*'], |
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help='files to be processed (regex on path)') |
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parser.add_argument('-fix', action='store_true', help='apply fix-its') |
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parser.add_argument('-format', action='store_true', help='Reformat code ' |
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'after applying fixes') |
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parser.add_argument('-style', default='file', help='The style of reformat ' |
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'code after applying fixes') |
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parser.add_argument('-p', dest='build_path', |
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help='Path used to read a compile command database.') |
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parser.add_argument('-extra-arg', dest='extra_arg', |
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action='append', default=[], |
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help='Additional argument to append to the compiler ' |
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'command line.') |
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parser.add_argument('-extra-arg-before', dest='extra_arg_before', |
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action='append', default=[], |
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help='Additional argument to prepend to the compiler ' |
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'command line.') |
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parser.add_argument('-o', dest='output_file', default='clang-tidy.out', |
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help='Save warnings to file') |
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parser.add_argument('-quiet', action='store_true', |
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help='Run clang-tidy in quiet mode') |
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args = parser.parse_args() |
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db_path = 'compile_commands.json' |
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if args.build_path is not None: |
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build_path = args.build_path |
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else: |
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# Find our database |
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build_path = find_compilation_database(db_path) |
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try: |
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invocation = [args.clang_tidy_binary, '-list-checks'] |
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invocation.append('-p=' + build_path) |
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if args.checks: |
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invocation.append('-checks=' + args.checks) |
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invocation.append('-') |
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subprocess.check_call(invocation) |
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except: |
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print("Unable to run clang-tidy.", file=sys.stderr) |
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sys.exit(1) |
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# Load the database and extract all files. |
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database = json.load(open(os.path.join(build_path, db_path))) |
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files = [make_absolute(entry['file'], entry['directory']) |
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for entry in database] |
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max_task = args.j |
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if max_task == 0: |
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max_task = multiprocessing.cpu_count() |
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tmpdir = None |
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if args.fix or args.export_fixes: |
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check_clang_apply_replacements_binary(args) |
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tmpdir = tempfile.mkdtemp() |
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# Build up a big regexy filter from all command line arguments. |
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file_name_re = re.compile('|'.join(args.files)) |
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try: |
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# Spin up a bunch of tidy-launching threads. |
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task_queue = queue.Queue(max_task) |
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write_to_file_queue = queue.Queue(); |
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for _ in range(max_task): |
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t = threading.Thread(target=run_tidy, |
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args=(args, tmpdir, build_path, task_queue, write_to_file_queue)) |
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t.daemon = True |
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t.start() |
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write_to_file_thread = WriteToFileThread(args.output_file, write_to_file_queue) |
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write_to_file_thread.daemon = True |
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write_to_file_thread.start() |
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# Fill the queue with files. |
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for name in files: |
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if file_name_re.search(name): |
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task_queue.put(name) |
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# Wait for all threads to be done. |
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task_queue.join() |
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write_to_file_queue.join() |
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except KeyboardInterrupt: |
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# This is a sad hack. Unfortunately subprocess goes |
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# bonkers with ctrl-c and we start forking merrily. |
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print('\nCtrl-C detected, goodbye.') |
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if tmpdir: |
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shutil.rmtree(tmpdir) |
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os.kill(0, 9) |
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return_code = 0 |
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if args.export_fixes: |
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print('Writing fixes to ' + args.export_fixes + ' ...') |
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try: |
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merge_replacement_files(tmpdir, args.export_fixes) |
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except: |
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print('Error exporting fixes.\n', file=sys.stderr) |
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traceback.print_exc() |
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return_code=1 |
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if args.fix: |
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print('Applying fixes ...') |
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try: |
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apply_fixes(args, tmpdir) |
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except: |
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print('Error applying fixes.\n', file=sys.stderr) |
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traceback.print_exc() |
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return_code=1 |
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if tmpdir: |
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shutil.rmtree(tmpdir) |
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sys.exit(return_code) |
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if __name__ == '__main__': |
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main() |