text: #!/usr/bin/env python
  # ===- lib/dfsan/scripts/build-libc-list.py ---------------------------------===#
  #
  #                     The LLVM Compiler Infrastructure
  #
  # This file is distributed under the University of Illinois Open Source
  # License. See LICENSE.TXT for details.
  #
  # ===------------------------------------------------------------------------===#
  # 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].decode(errors='replace').split('\n')
      if readelf_proc.returncode != 0:
          raise subprocess.CalledProcessError(readelf_proc.returncode, 'readelf')
      # NOTE For something like the ABI if you are stubbing it out you might want locally defined functions
      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 = glob.glob("/polytracker/the_klondike/pdfium/out/pdfium/obj/third_party/libjpeg_turbo/simd_asm/*.o")
  libs = [sys.argv[1]]
  """
  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:
          sys.stderr.write('warning: library %s not found\n' % l)
  
  functions = list(set(functions))
  functions.sort()
  
  for f in functions:
      f = f.replace("dfsw$", "")
      f = f.replace("dfs$", "")
      print('fun:%s=uninstrumented' % f)
      print('fun:%s=discard' % f)
  