1  #!/usr/bin/python3
       2  # Shared code for glibc conformance tests.
       3  # Copyright (C) 2018-2023 Free Software Foundation, Inc.
       4  # This file is part of the GNU C Library.
       5  #
       6  # The GNU C Library is free software; you can redistribute it and/or
       7  # modify it under the terms of the GNU Lesser General Public
       8  # License as published by the Free Software Foundation; either
       9  # version 2.1 of the License, or (at your option) any later version.
      10  #
      11  # The GNU C Library is distributed in the hope that it will be useful,
      12  # but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14  # Lesser General Public License for more details.
      15  #
      16  # You should have received a copy of the GNU Lesser General Public
      17  # License along with the GNU C Library; if not, see
      18  # <https://www.gnu.org/licenses/>.
      19  
      20  import os.path
      21  import re
      22  import subprocess
      23  import tempfile
      24  
      25  
      26  # Compiler options for each standard.
      27  CFLAGS = {'ISO': '-ansi',
      28            'ISO99': '-std=c99',
      29            'ISO11': '-std=c11',
      30            'POSIX': '-D_POSIX_C_SOURCE=199506L -ansi',
      31            'XPG4': '-ansi -D_XOPEN_SOURCE',
      32            'XPG42': '-ansi -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED',
      33            'UNIX98': '-ansi -D_XOPEN_SOURCE=500',
      34            'XOPEN2K': '-std=c99 -D_XOPEN_SOURCE=600',
      35            'XOPEN2K8': '-std=c99 -D_XOPEN_SOURCE=700',
      36            'POSIX2008': '-std=c99 -D_POSIX_C_SOURCE=200809L'}
      37  
      38  # ISO C90 keywords.
      39  KEYWORDS_C90 = {'auto', 'break', 'case', 'char', 'const', 'continue',
      40                  'default', 'do', 'double', 'else', 'enum', 'extern', 'float',
      41                  'for', 'goto', 'if', 'int', 'long', 'register', 'return',
      42                  'short', 'signed', 'sizeof', 'static', 'struct', 'switch',
      43                  'typedef', 'union', 'unsigned', 'void', 'volatile', 'while'}
      44  
      45  # ISO C99 keywords.
      46  KEYWORDS_C99 = KEYWORDS_C90 | {'inline', 'restrict'}
      47  
      48  # Keywords for each standard.
      49  KEYWORDS = {'ISO': KEYWORDS_C90,
      50              'ISO99': KEYWORDS_C99,
      51              'ISO11': KEYWORDS_C99,
      52              'POSIX': KEYWORDS_C90,
      53              'XPG4': KEYWORDS_C90,
      54              'XPG42': KEYWORDS_C90,
      55              'UNIX98': KEYWORDS_C90,
      56              'XOPEN2K': KEYWORDS_C99,
      57              'XOPEN2K8': KEYWORDS_C99,
      58              'POSIX2008': KEYWORDS_C99}
      59  
      60  
      61  def list_exported_functions(cc, standard, header):
      62      """Return the set of functions exported by a header, empty if an
      63      include of the header does not compile.
      64  
      65      """
      66      cc_all = '%s -D_ISOMAC %s' % (cc, CFLAGS[standard])
      67      with tempfile.TemporaryDirectory() as temp_dir:
      68          c_file_name = os.path.join(temp_dir, 'test.c')
      69          aux_file_name = os.path.join(temp_dir, 'test.c.aux')
      70          with open(c_file_name, 'w') as c_file:
      71              c_file.write('#include <%s>\n' % header)
      72          fns = set()
      73          cmd = ('%s -c %s -o /dev/null -aux-info %s'
      74                 % (cc_all, c_file_name, aux_file_name))
      75          try:
      76              subprocess.check_call(cmd, shell=True)
      77          except subprocess.CalledProcessError:
      78              return fns
      79          with open(aux_file_name, 'r') as aux_file:
      80              for line in aux_file:
      81                  line = re.sub(r'/\*.*?\*/', '', line)
      82                  line = line.strip()
      83                  if line:
      84                      # The word before a '(' that isn't '(*' is the
      85                      # function name before the argument list (not
      86                      # fully general, but sufficient for -aux-info
      87                      # output on standard headers).
      88                      m = re.search(r'([A-Za-z0-9_]+) *\([^*]', line)
      89                      if m:
      90                          fns.add(m.group(1))
      91                      else:
      92                          raise ValueError("couldn't parse -aux-info output: %s"
      93                                           % line)
      94      return fns