tools/find_runtime_symbols/reduce_debugline.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5 """Reduces result of 'readelf -wL' to just a list of starting addresses.
   6
   7 It lists up all addresses where the corresponding source files change.  The
   8 list is sorted in ascending order.  See tests/reduce_debugline_test.py for
   9 examples.
  10
  11 This script assumes that the result of 'readelf -wL' ends with an empty line.
  12
  13 Note: the option '-wL' has the same meaning with '--debug-dump=decodedline'.
  14 """
  15
  16 import re
  17 import sys
  18
  19
  20 _FILENAME_PATTERN = re.compile('(CU: |)(.+)\:')
  21
  22
  23 def reduce_decoded_debugline(input_file):
  24   filename = ''
  25   starting_dict = {}
  26   started = False
  27
  28   for line in input_file:
  29     line = line.strip()
  30     unpacked = line.split(None, 2)
  31
  32     if len(unpacked) == 3 and unpacked[2].startswith('0x'):
  33       if not started and filename:
  34         started = True
  35         starting_dict[int(unpacked[2], 16)] = filename
  36     else:
  37       started = False
  38       if line.endswith(':'):
  39         matched = _FILENAME_PATTERN.match(line)
  40         if matched:
  41           filename = matched.group(2)
  42
  43   starting_list = []
  44   prev_filename = ''
  45   for address in sorted(starting_dict):
  46     curr_filename = starting_dict[address]
  47     if prev_filename != curr_filename:
  48       starting_list.append((address, starting_dict[address]))
  49     prev_filename = curr_filename
  50   return starting_list
  51
  52
  53 def main():
  54   if len(sys.argv) != 1:
  55     print >> sys.stderr, 'Unsupported arguments'
  56     return 1
  57
  58   starting_list = reduce_decoded_debugline(sys.stdin)
  59   bits64 = starting_list[-1][0] > 0xffffffff
  60   for address, filename in starting_list:
  61     if bits64:
  62       print '%016x %s' % (address, filename)
  63     else:
  64       print '%08x %s' % (address, filename)
  65
  66
  67 if __name__ == '__main__':
  68   sys.exit(main())