mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 12:37:37 +00:00
94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
# ***** BEGIN LICENSE BLOCK *****
|
|
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
#
|
|
# The contents of this file are subject to the Mozilla Public License Version
|
|
# 1.1 (the "License"); you may not use this file except in compliance with
|
|
# the License. You may obtain a copy of the License at
|
|
# http://www.mozilla.org/MPL/
|
|
#
|
|
# Software distributed under the License is distributed on an "AS IS" basis,
|
|
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
# for the specific language governing rights and limitations under the
|
|
# License.
|
|
#
|
|
# The Original Code is mozilla.org
|
|
#
|
|
# The Initial Developer of the Original Code is
|
|
# the Mozilla Foundation
|
|
# Portions created by the Initial Developer are Copyright (C) 2011
|
|
# the Initial Developer. All Rights Reserved.
|
|
#
|
|
# Contributor(s):
|
|
# Mike Hommey <mh@glandium.org>
|
|
#
|
|
# Alternatively, the contents of this file may be used under the terms of
|
|
# either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
# in which case the provisions of the GPL or the LGPL are applicable instead
|
|
# of those above. If you wish to allow use of your version of this file only
|
|
# under the terms of either the GPL or the LGPL, and not to allow others to
|
|
# use your version of this file under the terms of the MPL, indicate your
|
|
# decision by deleting the provisions above and replace them with the notice
|
|
# and other provisions required by the GPL or the LGPL. If you do not delete
|
|
# the provisions above, a recipient may use your version of this file under
|
|
# the terms of any one of the MPL, the GPL or the LGPL.
|
|
#
|
|
# ***** END LICENSE BLOCK *****
|
|
|
|
# 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:])
|