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()) 69
