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llvm-project/clang-tools-extra/clang-tidy/add_new_check.py

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#!/usr/bin/env python
#
#===- add_new_check.py - clang-tidy check generator ----------*- 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
#
#===------------------------------------------------------------------------===#
from __future__ import print_function
import argparse
import os
import re
import sys
# Adapts the module's CMakelist file. Returns 'True' if it could add a new entry
# and 'False' if the entry already existed.
def adapt_cmake(module_path, check_name_camel):
filename = os.path.join(module_path, 'CMakeLists.txt')
with open(filename, 'r') as f:
lines = f.readlines()
cpp_file = check_name_camel + '.cpp'
# Figure out whether this check already exists.
for line in lines:
if line.strip() == cpp_file:
return False
print('Updating %s...' % filename)
with open(filename, 'w') as f:
cpp_found = False
file_added = False
for line in lines:
cpp_line = line.strip().endswith('.cpp')
if (not file_added) and (cpp_line or cpp_found):
cpp_found = True
if (line.strip() > cpp_file) or (not cpp_line):
f.write(' ' + cpp_file + '\n')
file_added = True
f.write(line)
return True
# Adds a header for the new check.
def write_header(module_path, module, namespace, check_name, check_name_camel):
check_name_dashes = module + '-' + check_name
filename = os.path.join(module_path, check_name_camel) + '.h'
print('Creating %s...' % filename)
with open(filename, 'w') as f:
header_guard = ('LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_' + module.upper() + '_'
+ check_name_camel.upper() + '_H')
f.write('//===--- ')
f.write(os.path.basename(filename))
f.write(' - clang-tidy ')
f.write('-' * max(0, 42 - len(os.path.basename(filename))))
f.write('*- C++ -*-===//')
f.write("""
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef %(header_guard)s
#define %(header_guard)s
#include "../ClangTidyCheck.h"
namespace clang {
namespace tidy {
namespace %(namespace)s {
/// FIXME: Write a short description.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/%(check_name_dashes)s.html
class %(check_name)s : public ClangTidyCheck {
public:
%(check_name)s(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context) {}
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
};
} // namespace %(namespace)s
} // namespace tidy
} // namespace clang
#endif // %(header_guard)s
""" % {'header_guard': header_guard,
'check_name': check_name_camel,
'check_name_dashes': check_name_dashes,
'module': module,
'namespace': namespace})
# Adds the implementation of the new check.
def write_implementation(module_path, module, namespace, check_name_camel):
filename = os.path.join(module_path, check_name_camel) + '.cpp'
print('Creating %s...' % filename)
with open(filename, 'w') as f:
f.write('//===--- ')
f.write(os.path.basename(filename))
f.write(' - clang-tidy ')
f.write('-' * max(0, 51 - len(os.path.basename(filename))))
f.write('-===//')
f.write("""
//
// 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
//
//===----------------------------------------------------------------------===//
#include "%(check_name)s.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace %(namespace)s {
void %(check_name)s::registerMatchers(MatchFinder *Finder) {
// FIXME: Add matchers.
Finder->addMatcher(functionDecl().bind("x"), this);
}
void %(check_name)s::check(const MatchFinder::MatchResult &Result) {
// FIXME: Add callback implementation.
const auto *MatchedDecl = Result.Nodes.getNodeAs<FunctionDecl>("x");
if (MatchedDecl->getName().startswith("awesome_"))
return;
diag(MatchedDecl->getLocation(), "function %%0 is insufficiently awesome")
<< MatchedDecl;
diag(MatchedDecl->getLocation(), "insert 'awesome'", DiagnosticIDs::Note)
<< FixItHint::CreateInsertion(MatchedDecl->getLocation(), "awesome_");
}
} // namespace %(namespace)s
} // namespace tidy
} // namespace clang
""" % {'check_name': check_name_camel,
'module': module,
'namespace': namespace})
# Modifies the module to include the new check.
def adapt_module(module_path, module, check_name, check_name_camel):
modulecpp = list(filter(
lambda p: p.lower() == module.lower() + 'tidymodule.cpp',
os.listdir(module_path)))[0]
filename = os.path.join(module_path, modulecpp)
with open(filename, 'r') as f:
lines = f.readlines()
print('Updating %s...' % filename)
with open(filename, 'w') as f:
header_added = False
header_found = False
check_added = False
check_decl = (' CheckFactories.registerCheck<' + check_name_camel +
'>(\n "' + module + '-' + check_name + '");\n')
for line in lines:
if not header_added:
match = re.search('#include "(.*)"', line)
if match:
header_found = True
if match.group(1) > check_name_camel:
header_added = True
f.write('#include "' + check_name_camel + '.h"\n')
elif header_found:
header_added = True
f.write('#include "' + check_name_camel + '.h"\n')
if not check_added:
if line.strip() == '}':
check_added = True
f.write(check_decl)
else:
match = re.search('registerCheck<(.*)>', line)
if match and match.group(1) > check_name_camel:
check_added = True
f.write(check_decl)
f.write(line)
# Adds a release notes entry.
def add_release_notes(module_path, module, check_name):
check_name_dashes = module + '-' + check_name
filename = os.path.normpath(os.path.join(module_path,
'../../docs/ReleaseNotes.rst'))
with open(filename, 'r') as f:
lines = f.readlines()
lineMatcher = re.compile('Improvements to clang-tidy')
nextSectionMatcher = re.compile('Improvements to clang-include-fixer')
checkerMatcher = re.compile('- New :doc:`(.*)')
print('Updating %s...' % filename)
with open(filename, 'w') as f:
note_added = False
header_found = False
next_header_found = False
add_note_here = False
for line in lines:
if not note_added:
match = lineMatcher.match(line)
match_next = nextSectionMatcher.match(line)
match_checker = checkerMatcher.match(line)
if match_checker:
last_checker = match_checker.group(1)
if last_checker > check_name_dashes:
add_note_here = True
if match_next:
next_header_found = True
add_note_here = True
if match:
header_found = True
f.write(line)
continue
if line.startswith('----'):
f.write(line)
continue
if header_found and add_note_here:
if not line.startswith('----'):
f.write("""- New :doc:`%s
<clang-tidy/checks/%s>` check.
FIXME: add release notes.
""" % (check_name_dashes, check_name_dashes))
note_added = True
f.write(line)
# Adds a test for the check.
def write_test(module_path, module, check_name, test_extension):
check_name_dashes = module + '-' + check_name
filename = os.path.normpath(os.path.join(module_path, '../../test/clang-tidy',
check_name_dashes + '.' + test_extension))
print('Creating %s...' % filename)
with open(filename, 'w') as f:
f.write("""// RUN: %%check_clang_tidy %%s %(check_name_dashes)s %%t
// FIXME: Add something that triggers the check here.
void f();
// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: function 'f' is insufficiently awesome [%(check_name_dashes)s]
// FIXME: Verify the applied fix.
// * Make the CHECK patterns specific enough and try to make verified lines
// unique to avoid incorrect matches.
// * Use {{}} for regular expressions.
// CHECK-FIXES: {{^}}void awesome_f();{{$}}
// FIXME: Add something that doesn't trigger the check here.
void awesome_f2();
""" % {'check_name_dashes': check_name_dashes})
# Recreates the list of checks in the docs/clang-tidy/checks directory.
def update_checks_list(clang_tidy_path):
docs_dir = os.path.join(clang_tidy_path, '../docs/clang-tidy/checks')
filename = os.path.normpath(os.path.join(docs_dir, 'list.rst'))
with open(filename, 'r') as f:
lines = f.readlines()
doc_files = list(filter(lambda s: s.endswith('.rst') and s != 'list.rst',
os.listdir(docs_dir)))
doc_files.sort()
def format_link(doc_file):
check_name = doc_file.replace('.rst', '')
with open(os.path.join(docs_dir, doc_file), 'r') as doc:
content = doc.read()
match = re.search('.*:orphan:.*', content)
if match:
return ''
match = re.search('.*:http-equiv=refresh: \d+;URL=(.*).html.*',
content)
if match:
return ' %(check)s (redirects to %(target)s) <%(check)s>\n' % {
'check': check_name,
'target': match.group(1)
}
return ' %s\n' % check_name
checks = map(format_link, doc_files)
print('Updating %s...' % filename)
with open(filename, 'w') as f:
for line in lines:
f.write(line)
if line.startswith('.. toctree::'):
f.writelines(checks)
break
# Adds a documentation for the check.
def write_docs(module_path, module, check_name):
check_name_dashes = module + '-' + check_name
filename = os.path.normpath(os.path.join(
module_path, '../../docs/clang-tidy/checks/', check_name_dashes + '.rst'))
print('Creating %s...' % filename)
with open(filename, 'w') as f:
f.write(""".. title:: clang-tidy - %(check_name_dashes)s
%(check_name_dashes)s
%(underline)s
FIXME: Describe what patterns does the check detect and why. Give examples.
""" % {'check_name_dashes': check_name_dashes,
'underline': '=' * len(check_name_dashes)})
def main():
language_to_extension = {
'c': 'c',
'c++': 'cpp',
'objc': 'm',
'objc++': 'mm',
}
parser = argparse.ArgumentParser()
parser.add_argument(
'--update-docs',
action='store_true',
help='just update the list of documentation files, then exit')
parser.add_argument(
'--language',
help='language to use for new check (defaults to c++)',
choices=language_to_extension.keys(),
default='c++',
metavar='LANG')
parser.add_argument(
'module',
nargs='?',
help='module directory under which to place the new tidy check (e.g., misc)')
parser.add_argument(
'check',
nargs='?',
help='name of new tidy check to add (e.g. foo-do-the-stuff)')
args = parser.parse_args()
if args.update_docs:
update_checks_list(os.path.dirname(sys.argv[0]))
return
if not args.module or not args.check:
print('Module and check must be specified.')
parser.print_usage()
return
module = args.module
check_name = args.check
if check_name.startswith(module):
print('Check name "%s" must not start with the module "%s". Exiting.' % (
check_name, module))
return
check_name_camel = ''.join(map(lambda elem: elem.capitalize(),
check_name.split('-'))) + 'Check'
clang_tidy_path = os.path.dirname(sys.argv[0])
module_path = os.path.join(clang_tidy_path, module)
if not adapt_cmake(module_path, check_name_camel):
return
# Map module names to namespace names that don't conflict with widely used top-level namespaces.
if module == 'llvm':
namespace = module + '_check'
else:
namespace = module
write_header(module_path, module, namespace, check_name, check_name_camel)
write_implementation(module_path, module, namespace, check_name_camel)
adapt_module(module_path, module, check_name, check_name_camel)
add_release_notes(module_path, module, check_name)
test_extension = language_to_extension.get(args.language)
write_test(module_path, module, check_name, test_extension)
write_docs(module_path, module, check_name)
update_checks_list(clang_tidy_path)
print('Done. Now it\'s your turn!')
if __name__ == '__main__':
main()
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