| # This Source Code Form is subject to the terms of the Mozilla Public |
| # License, v. 2.0. If a copy of the MPL was not distributed with this |
| # file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| |
| # This script returns the number of items for the DW_AT_ranges corresponding |
| # to a given compilation unit. This is used as a helper to find a bug in some |
| # versions of GNU ld. |
| |
| import subprocess |
| import sys |
| import re |
| |
| def get_range_for(compilation_unit, debug_info): |
| '''Returns the range offset for a given compilation unit |
| in a given debug_info.''' |
| name = ranges = '' |
| search_cu = False |
| for nfo in debug_info.splitlines(): |
| if 'DW_TAG_compile_unit' in nfo: |
| search_cu = True |
| elif 'DW_TAG_' in nfo or not nfo.strip(): |
| if name == compilation_unit: |
| return int(ranges, 16) |
| name = ranges = '' |
| search_cu = False |
| if search_cu: |
| if 'DW_AT_name' in nfo: |
| name = nfo.rsplit(None, 1)[1] |
| elif 'DW_AT_ranges' in nfo: |
| ranges = nfo.rsplit(None, 1)[1] |
| return None |
| |
| def get_range_length(range, debug_ranges): |
| '''Returns the number of items in the range starting at the |
| given offset.''' |
| length = 0 |
| for line in debug_ranges.splitlines(): |
| m = re.match('\s*([0-9a-fA-F]+)\s+([0-9a-fA-F]+)\s+([0-9a-fA-F]+)', line) |
| if m and int(m.group(1), 16) == range: |
| length += 1 |
| return length |
| |
| def main(bin, compilation_unit): |
| p = subprocess.Popen(['objdump', '-W', bin], stdout = subprocess.PIPE, stderr = subprocess.PIPE) |
| (out, err) = p.communicate() |
| sections = re.split('\n(Contents of the|The section) ', out) |
| debug_info = [s for s in sections if s.startswith('.debug_info')] |
| debug_ranges = [s for s in sections if s.startswith('.debug_ranges')] |
| if not debug_ranges or not debug_info: |
| return 0 |
| |
| range = get_range_for(compilation_unit, debug_info[0]) |
| if range is not None: |
| return get_range_length(range, debug_ranges[0]) |
| |
| return -1 |
| |
| |
| if __name__ == '__main__': |
| print main(*sys.argv[1:]) |
