1 files changed, 97 insertions, 0 deletions
diff --git a/third_party/libwebrtc/tools_webrtc/clang_tidy.py b/third_party/libwebrtc/tools_webrtc/clang_tidy.py
new file mode 100755
index 0000000000..b3f738eab3
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+++ b/third_party/libwebrtc/tools_webrtc/clang_tidy.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env vpython3
+
+# Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+"""Invoke clang-tidy tool.
+
+Usage: clang_tidy.py file.cc [clang-tidy-args...]
+
+Just a proof of concept!
+We use an embedded clang-tidy whose version doesn't match clang++.
+"""
+
+import argparse
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+from presubmit_checks_lib.build_helpers import (GetClangTidyPath,
+                                                GetCompilationCommand)
+
+# We enable all checkers by default for investigation purpose.
+# This includes clang-analyzer-* checks.
+# Individual checkers can be disabled via command line options.
+# TODO(bugs.webrtc.com/10258): Select checkers relevant to webrtc guidelines.
+CHECKER_OPTION = '-checks=*'
+
+
+def Process(filepath, args):
+  # Build directory is needed to gather compilation flags.
+  # Create a temporary one (instead of reusing an existing one)
+  # to keep the CLI simple and unencumbered.
+  out_dir = tempfile.mkdtemp('clang_tidy')
+
+  try:
+    gn_args = []  # Use default build.
+    command = GetCompilationCommand(filepath, gn_args, out_dir)
+
+    # Remove warning flags. They aren't needed and they cause trouble
+    # when clang-tidy doesn't match most recent clang.
+    # Same battle for -f (e.g. -fcomplete-member-pointers).
+    command = [
+        arg for arg in command
+        if not (arg.startswith('-W') or arg.startswith('-f'))
+    ]
+
+    # Path from build dir.
+    rel_path = os.path.relpath(os.path.abspath(filepath), out_dir)
+
+    # Replace clang++ by clang-tidy
+    command[0:1] = [GetClangTidyPath(), CHECKER_OPTION, rel_path
+                    ] + args + ['--']  # Separator for clang flags.
+    print("Running: %s" % ' '.join(command))
+    # Run from build dir so that relative paths are correct.
+    p = subprocess.Popen(command,
+                         cwd=out_dir,
+                         stdout=sys.stdout,
+                         stderr=sys.stderr)
+    p.communicate()
+    return p.returncode
+  finally:
+    shutil.rmtree(out_dir, ignore_errors=True)
+
+
+def ValidateCC(filepath):
+  """We can only analyze .cc files. Provide explicit message about that."""
+  if filepath.endswith('.cc'):
+    return filepath
+  msg = ('%s not supported.\n'
+         'For now, we can only analyze translation units (.cc files).' %
+         filepath)
+  raise argparse.ArgumentTypeError(msg)
+
+
+def Main():
+  description = (
+      "Run clang-tidy on single cc file.\n"
+      "Use flags, defines and include paths as in default debug build.\n"
+      "WARNING, this is a POC version with rough edges.")
+  parser = argparse.ArgumentParser(description=description)
+  parser.add_argument('filepath',
+                      help='Specifies the path of the .cc file to analyze.',
+                      type=ValidateCC)
+  parser.add_argument('args',
+                      nargs=argparse.REMAINDER,
+                      help='Arguments passed to clang-tidy')
+  parsed_args = parser.parse_args()
+  return Process(parsed_args.filepath, parsed_args.args)
+
+
+if __name__ == '__main__':
+  sys.exit(Main())