tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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mock_addr2line (2491B)

      1 #!/usr/bin/env python3
      2 # Copyright 2014 The Chromium Authors
      3 # Use of this source code is governed by a BSD-style license that can be
      4 # found in the LICENSE file.
      5 
      6 """Simple mock for addr2line.
      7 
      8 Outputs mock symbol information, with each symbol being a function of the
      9 original address (so it is easy to double-check consistency in unittests).
     10 """
     11 
     12 
     13 import optparse
     14 import os
     15 import posixpath
     16 import sys
     17 import time
     18 
     19 
     20 def main(argv):
     21   parser = optparse.OptionParser()
     22   parser.add_option('-e', '--exe', dest='exe')  # Path of the debug-library.so.
     23   # Silently swallow the other unnecessary arguments.
     24   parser.add_option('-C', '--demangle', action='store_true')
     25   parser.add_option('-f', '--functions', action='store_true')
     26   parser.add_option('-i', '--inlines', action='store_true')
     27   options, _ = parser.parse_args(argv[1:])
     28   lib_file_name = posixpath.basename(options.exe)
     29   processed_sym_count = 0
     30   crash_every = int(os.environ.get('MOCK_A2L_CRASH_EVERY', 0))
     31   hang_every = int(os.environ.get('MOCK_A2L_HANG_EVERY', 0))
     32 
     33   while(True):
     34     line = sys.stdin.readline().rstrip('\r')
     35     if not line:
     36       break
     37 
     38     # An empty line should generate '??,??:0' (is used as marker for inlines).
     39     if line == '\n':
     40       print('??')
     41       print('??:0')
     42       sys.stdout.flush()
     43       continue
     44 
     45     addr = int(line, 16)
     46     processed_sym_count += 1
     47     if crash_every and processed_sym_count % crash_every == 0:
     48       sys.exit(1)
     49     if hang_every and processed_sym_count % hang_every == 0:
     50       time.sleep(1)
     51 
     52     # Addresses < 1M will return good mock symbol information.
     53     if addr < 1024 * 1024:
     54       print('mock_sym_for_addr_%d' % addr)
     55       print('mock_src/%s.c:%d' % (lib_file_name, addr))
     56 
     57     # Addresses 1M <= x < 2M will return symbols with a name but a missing path.
     58     elif addr < 2 * 1024 * 1024:
     59       print('mock_sym_for_addr_%d' % addr)
     60       print('??:0')
     61 
     62     # Addresses 2M <= x < 3M will return unknown symbol information.
     63     elif addr < 3 * 1024 * 1024:
     64       print('??')
     65       print('??')
     66 
     67     # Addresses 3M <= x < 4M will return inlines.
     68     elif addr < 4 * 1024 * 1024:
     69       print('mock_sym_for_addr_%d_inner' % addr)
     70       print('mock_src/%s.c:%d' % (lib_file_name, addr))
     71       print('mock_sym_for_addr_%d_middle' % addr)
     72       print('mock_src/%s.c:%d' % (lib_file_name, addr))
     73       print('mock_sym_for_addr_%d_outer' % addr)
     74       print('mock_src/%s.c:%d' % (lib_file_name, addr))
     75 
     76     sys.stdout.flush()
     77 
     78 
     79 if __name__ == '__main__':
     80   main(sys.argv)