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1 #!/usr/bin/env python | |
2 # | |
3 # Copyright 2013 The Chromium Authors. All rights reserved. | |
4 # Use of this source code is governed by a BSD-style license that can be | |
5 # found in the LICENSE file. | |
6 | |
7 """Symbolizes stack traces generated by Chromium for Android. | |
8 | |
9 Sample usage: | |
10 adb logcat chromium:V | symbolize.py | |
11 """ | |
12 | |
13 import os | |
14 import re | |
15 import sys | |
16 | |
17 from pylib import constants | |
18 | |
19 # Uses symbol.py from third_party/android_platform, not python's. | |
20 sys.path.insert(0, | |
21 os.path.join(constants.DIR_SOURCE_ROOT, | |
22 'third_party/android_platform/development/scripts')) | |
23 import symbol | |
24 | |
25 # Sample output from base/debug/stack_trace_android.cc | |
26 #00 0x693cd34f /path/to/some/libfoo.so+0x0007434f | |
27 TRACE_LINE = re.compile(r'(?P<frame>\#[0-9]+ 0x[0-9a-f]{8,8}) ' | |
28 r'(?P<lib>[^+]+)\+0x(?P<addr>[0-9a-f]{8,8})') | |
29 | |
30 class Symbolizer(object): | |
31 def __init__(self, output): | |
32 self._output = output | |
33 | |
34 def write(self, data): | |
35 while True: | |
36 match = re.search(TRACE_LINE, data) | |
37 if not match: | |
38 self._output.write(data) | |
39 break | |
40 | |
41 frame = match.group('frame') | |
42 lib = match.group('lib') | |
43 addr = match.group('addr') | |
44 | |
45 # TODO(scherkus): Doing a single lookup per line is pretty slow, | |
46 # especially with larger libraries. Consider caching strategies such as: | |
47 # 1) Have Python load the libraries and do symbol lookups instead of | |
48 # calling out to addr2line each time. | |
49 # 2) Have Python keep multiple addr2line instances open as subprocesses, | |
50 # piping addresses and reading back symbols as we find them | |
51 # 3) Read ahead the entire stack trace until we find no more, then batch | |
52 # the symbol lookups. | |
53 # | |
54 # TODO(scherkus): These results are memoized, which could result in | |
55 # incorrect lookups when running this script on long-lived instances | |
56 # (e.g., adb logcat) when doing incremental development. Consider clearing | |
57 # the cache when modification timestamp of libraries change. | |
58 sym = symbol.SymbolInformation(lib, addr, False)[0][0] | |
59 | |
60 if not sym: | |
61 post = match.end('addr') | |
62 self._output.write(data[:post]) | |
63 data = data[post:] | |
64 continue | |
65 | |
66 pre = match.start('frame') | |
67 post = match.end('addr') | |
68 | |
69 self._output.write(data[:pre]) | |
70 self._output.write(frame) | |
71 self._output.write(' ') | |
72 self._output.write(sym) | |
73 | |
74 data = data[post:] | |
75 | |
76 def flush(self): | |
77 self._output.flush() | |
78 | |
79 | |
80 def main(): | |
81 symbolizer = Symbolizer(sys.stdout) | |
82 for line in sys.stdin: | |
83 symbolizer.write(line) | |
84 symbolizer.flush() | |
85 | |
86 | |
87 if __name__ == '__main__': | |
88 main() | |
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