| #!/usr/bin/env python |
| # |
| # Copyright 2013 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. |
| |
| """Symbolizes stack traces generated by Chromium for Android. |
| |
| Sample usage: |
| adb logcat chromium:V | symbolize.py |
| """ |
| |
| import os |
| import re |
| import sys |
| |
| from pylib import constants |
| |
| # Uses symbol.py from third_party/android_platform, not python's. |
| sys.path.insert(0, |
| os.path.join(constants.DIR_SOURCE_ROOT, |
| 'third_party/android_platform/development/scripts')) |
| import symbol |
| |
| # Sample output from base/debug/stack_trace_android.cc |
| #00 0x693cd34f /path/to/some/libfoo.so+0x0007434f |
| TRACE_LINE = re.compile('(?P<frame>\#[0-9]+ 0x[0-9a-f]{8,8}) ' |
| '(?P<lib>[^+]+)\+0x(?P<addr>[0-9a-f]{8,8})') |
| |
| class Symbolizer(object): |
| def __init__(self, output): |
| self._output = output |
| |
| def write(self, data): |
| while True: |
| match = re.search(TRACE_LINE, data) |
| if not match: |
| self._output.write(data) |
| break |
| |
| frame = match.group('frame') |
| lib = match.group('lib') |
| addr = match.group('addr') |
| |
| # TODO(scherkus): Doing a single lookup per line is pretty slow, |
| # especially with larger libraries. Consider caching strategies such as: |
| # 1) Have Python load the libraries and do symbol lookups instead of |
| # calling out to addr2line each time. |
| # 2) Have Python keep multiple addr2line instances open as subprocesses, |
| # piping addresses and reading back symbols as we find them |
| # 3) Read ahead the entire stack trace until we find no more, then batch |
| # the symbol lookups. |
| # |
| # TODO(scherkus): These results are memoized, which could result in |
| # incorrect lookups when running this script on long-lived instances |
| # (e.g., adb logcat) when doing incremental development. Consider clearing |
| # the cache when modification timestamp of libraries change. |
| sym = symbol.SymbolInformation(lib, addr, False)[0][0] |
| |
| if not sym: |
| post = match.end('addr') |
| self._output.write(data[:post]) |
| data = data[post:] |
| continue |
| |
| pre = match.start('frame') |
| post = match.end('addr') |
| |
| self._output.write(data[:pre]) |
| self._output.write(frame) |
| self._output.write(' ') |
| self._output.write(sym) |
| |
| data = data[post:] |
| |
| def flush(self): |
| self._output.flush() |
| |
| |
| def main(): |
| symbolizer = Symbolizer(sys.stdout) |
| for line in sys.stdin: |
| symbolizer.write(line) |
| symbolizer.flush() |
| |
| |
| if __name__ == '__main__': |
| main() |