text: #!/usr/bin/env python
  #===- lib/dfsan/scripts/build-libc-list.py ---------------------------------===#
  #
  # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  # See https://llvm.org/LICENSE.txt for license information.
  # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  #
  #===------------------------------------------------------------------------===#
  # The purpose of this script is to identify every function symbol in a set of
  # libraries (in this case, libc and libgcc) so that they can be marked as
  # uninstrumented, thus allowing the instrumentation pass to treat calls to those
  # functions correctly.
  
  import os
  import subprocess
  import sys
  from optparse import OptionParser
  
  def defined_function_list(object):
    functions = []
    readelf_proc = subprocess.Popen(['readelf', '-s', '-W', object],
                                    stdout=subprocess.PIPE)
    readelf = readelf_proc.communicate()[0].split('\n')
    if readelf_proc.returncode != 0:
      raise subprocess.CalledProcessError(readelf_proc.returncode, 'readelf')
    for line in readelf:
      if (line[31:35] == 'FUNC' or line[31:36] == 'IFUNC') and \
         line[39:44] != 'LOCAL' and \
         line[55:58] != 'UND':
        function_name = line[59:].split('@')[0]
        functions.append(function_name)
    return functions
  
  p = OptionParser()
  
  p.add_option('--libc-dso-path', metavar='PATH',
               help='path to libc DSO directory',
               default='/lib/x86_64-linux-gnu')
  p.add_option('--libc-archive-path', metavar='PATH',
               help='path to libc archive directory',
               default='/usr/lib/x86_64-linux-gnu')
  
  p.add_option('--libgcc-dso-path', metavar='PATH',
               help='path to libgcc DSO directory',
               default='/lib/x86_64-linux-gnu')
  p.add_option('--libgcc-archive-path', metavar='PATH',
               help='path to libgcc archive directory',
               default='/usr/lib/gcc/x86_64-linux-gnu/4.6')
  
  p.add_option('--with-libstdcxx', action='store_true',
               dest='with_libstdcxx',
               help='include libstdc++ in the list (inadvisable)')
  p.add_option('--libstdcxx-dso-path', metavar='PATH',
               help='path to libstdc++ DSO directory',
               default='/usr/lib/x86_64-linux-gnu')
  
  (options, args) = p.parse_args()
  
  libs = [os.path.join(options.libc_dso_path, name) for name in
          ['ld-linux-x86-64.so.2',
           'libanl.so.1',
           'libBrokenLocale.so.1',
           'libcidn.so.1',
           'libcrypt.so.1',
           'libc.so.6',
           'libdl.so.2',
           'libm.so.6',
           'libnsl.so.1',
           'libpthread.so.0',
           'libresolv.so.2',
           'librt.so.1',
           'libthread_db.so.1',
           'libutil.so.1']]
  libs += [os.path.join(options.libc_archive_path, name) for name in
           ['libc_nonshared.a',
            'libpthread_nonshared.a']]
  
  libs.append(os.path.join(options.libgcc_dso_path, 'libgcc_s.so.1'))
  libs.append(os.path.join(options.libgcc_archive_path, 'libgcc.a'))
  
  if options.with_libstdcxx:
    libs.append(os.path.join(options.libstdcxx_dso_path, 'libstdc++.so.6'))
  
  functions = []
  for l in libs:
    if os.path.exists(l):
      functions += defined_function_list(l)
    else:
      print >> sys.stderr, 'warning: library %s not found' % l
  
  functions = list(set(functions))
  functions.sort()
  
  for f in functions:
    print 'fun:%s=uninstrumented' % f
  