android: Convert java_deobfuscate.py to Java

build/android/stacktrace/java_deobfuscate.py

-#!/usr/bin/env python
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""A tool to deobfuscate Java stack traces.
-
-Utility wrapper around ReTrace to deobfuscate stack traces that have been
-mangled by ProGuard. Takes stack traces from stdin (eg. adb logcat |
-java_deobfuscate.py proguard.mapping) and files.
-"""
-
-import argparse
-import os
-
-_SRC_DIR = os.path.normpath(
-    os.path.join(os.path.dirname(__file__), os.pardir, os.pardir, os.pardir))
-
-# This regex is based on the one from:
-# http://proguard.sourceforge.net/manual/retrace/usage.html.
-# But with the "at" part changed to "(?::|\bat)", to account for lines like:
-#     06-22 13:58:02.895  4674  4674 E THREAD_STATE:     bLA.a(PG:173)
-# Normal stack trace lines look like:
-# java.lang.RuntimeException: Intentional Java Crash
-#     at org.chromium.chrome.browser.tab.Tab.handleJavaCrash(Tab.java:682)
-#     at org.chromium.chrome.browser.tab.Tab.loadUrl(Tab.java:644)
-_LINE_PARSE_REGEX = (
-    r'(?:.*?(?::|\bat)\s+%c\.%m\s*\(%s(?::%l)?\)\s*)|'
-    r'(?:(?:.*?[:"]\s+)?%c(?::.*)?)')
-
-
-def main():
-  parser = argparse.ArgumentParser(description=(__doc__))
-  parser.add_argument(
-      'mapping_file',
-      help='ProGuard mapping file from build which the stacktrace is from.')
-  parser.add_argument(
-      '--stacktrace',
-      help='Stacktrace file to be deobfuscated.')
-  args = parser.parse_args()
-
-  retrace_path = os.path.join(
-      _SRC_DIR, 'third_party', 'proguard', 'lib', 'retrace.jar')
-
-  cmd = ['java', '-jar', retrace_path, '-regex', _LINE_PARSE_REGEX,
-         args.mapping_file]
-  if args.stacktrace:
-    cmd.append(args.stacktrace)
-  os.execvp('java', cmd)
-
-
-if __name__ == '__main__':
-  main()