1 #!/usr/bin/env python2 2 # 3 # Copyright (C) 2015 The Android Open Source Project 4 # 5 # Licensed under the Apache License, Version 2.0 (the 'License'); 6 # you may not use this file except in compliance with the License. 7 # You may obtain a copy of the License at 8 # 9 # http://www.apache.org/licenses/LICENSE-2.0 10 # 11 # Unless required by applicable law or agreed to in writing, software 12 # distributed under the License is distributed on an 'AS IS' BASIS, 13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 # See the License for the specific language governing permissions and 15 # limitations under the License. 16 # 17 # pylint: disable=bad-indentation,bad-continuation 18 import glob 19 import os 20 import re 21 import sys 22 23 import symbols 24 25 only_unwanted = False 26 if len(sys.argv) > 1: 27 if sys.argv[1] in ('-u', '--unwanted'): 28 only_unwanted = True 29 30 toolchain = os.environ['ANDROID_TOOLCHAIN'] 31 arch = re.sub(r'.*/linux-x86/([^/]+)/.*', r'\1', toolchain) 32 if arch == 'aarch64': 33 arch = 'arm64' 34 35 def MangleGlibcNameToBionic(name): 36 if name in glibc_to_bionic_names: 37 return glibc_to_bionic_names[name] 38 return name 39 40 def GetNdkIgnored(arch): # pylint: disable=redefined-outer-name 41 ignored_symbols = set() 42 files = glob.glob('%s/ndk/build/tools/unwanted-symbols/%s/*' % 43 (os.getenv('ANDROID_BUILD_TOP'), arch)) 44 for f in files: 45 ignored_symbols |= set(open(f, 'r').read().splitlines()) 46 return ignored_symbols 47 48 glibc_to_bionic_names = { 49 '__res_init': 'res_init', 50 '__res_mkquery': 'res_mkquery', 51 '__res_query': 'res_query', 52 '__res_search': 'res_search', 53 '__xpg_basename': '__gnu_basename', 54 } 55 56 glibc = symbols.GetFromSystemSo([ 57 'libc.so.*', 58 'librt.so.*', 59 'libpthread.so.*', 60 'libresolv.so.*', 61 'libm.so.*', 62 'libutil.so.*', 63 ]) 64 65 bionic = symbols.GetFromAndroidSo(['libc.so', 'libm.so']) 66 this_dir = os.path.dirname(os.path.realpath(__file__)) 67 posix = symbols.GetFromTxt(os.path.join(this_dir, 'posix-2013.txt')) 68 ndk_ignored = GetNdkIgnored(arch) 69 70 glibc = set(map(MangleGlibcNameToBionic, glibc)) 71 72 # bionic includes various BSD symbols to ease porting other BSD-licensed code. 73 bsd_stuff = set([ 74 'arc4random', 75 'arc4random_buf', 76 'arc4random_uniform', 77 'basename_r', 78 'dirname_r', 79 'fgetln', 80 'fpurge', 81 'funopen', 82 'funopen64', 83 'gamma_r', 84 'gammaf_r', 85 'getprogname', 86 'setprogname', 87 'strlcat', 88 'strlcpy', 89 'sys_signame', 90 'wcslcat', 91 'wcslcpy' 92 ]) 93 # Some symbols are part of the FORTIFY implementation. 94 FORTIFY_stuff = set([ 95 '__FD_CLR_chk', 96 '__FD_ISSET_chk', 97 '__FD_SET_chk', 98 '__fwrite_chk', 99 '__memchr_chk', 100 '__memrchr_chk', 101 '__pwrite64_chk', 102 '__pwrite_chk', 103 '__stack_chk_guard', 104 '__stpncpy_chk2', 105 '__strchr_chk', 106 '__strlcat_chk', 107 '__strlcpy_chk', 108 '__strlen_chk', 109 '__strncpy_chk2', 110 '__strrchr_chk', 111 '__umask_chk' 112 '__write_chk', 113 ]) 114 # Some symbols are used to implement public macros. 115 macro_stuff = set([ 116 '__assert2', 117 '__errno', 118 '__fe_dfl_env', 119 '__get_h_errno', 120 '__fpclassifyd', 121 '__isfinite', 122 '__isfinitef', 123 '__isfinitel', 124 '__isnormal', 125 '__isnormalf', 126 '__isnormall', 127 '__sF', 128 '__pthread_cleanup_pop', 129 '__pthread_cleanup_push', 130 ]) 131 # bionic exposes various Linux features that glibc doesn't. 132 linux_stuff = set([ 133 'getauxval', 134 'gettid', 135 'tgkill' 136 ]) 137 # Some standard stuff isn't yet in the versions of glibc we're using. 138 std_stuff = set([ 139 'at_quick_exit', 140 'c16rtomb', 141 'c32rtomb', 142 'mbrtoc16', 143 'mbrtoc32', 144 ]) 145 # These have mangled names in glibc, with a macro taking the "obvious" name. 146 weird_stuff = set([ 147 'fstat', 148 'fstat64', 149 'fstatat', 150 'fstatat64', 151 'isfinite', 152 'isfinitef', 153 'isfinitel', 154 'isnormal', 155 'isnormalf', 156 'isnormall', 157 'lstat', 158 'lstat64', 159 'mknod', 160 'mknodat', 161 'stat', 162 'stat64', 163 'optreset', 164 'sigsetjmp', 165 ]) 166 # These exist in glibc, but under slightly different names (generally one extra 167 # or one fewer _). TODO: check against glibc names. 168 libresolv_stuff = set([ 169 '__res_send_setqhook', 170 '__res_send_setrhook', 171 '_resolv_flush_cache_for_net', 172 '_resolv_set_nameservers_for_net', 173 'dn_expand', 174 'nsdispatch', 175 ]) 176 # Implementation details we know we export (and can't get away from). 177 known = set([ 178 '_ctype_', 179 '__libc_init', 180 ]) 181 182 if not only_unwanted: 183 #print 'glibc:' 184 #for symbol in sorted(glibc): 185 # print symbol 186 #print 187 188 #print 'bionic:' 189 #for symbol in sorted(bionic): 190 # print symbol 191 #print 192 193 print 'in glibc (but not posix) but not bionic:' 194 for symbol in sorted((glibc - posix).difference(bionic)): 195 print symbol 196 print 197 198 print 'in posix (and implemented in glibc) but not bionic:' 199 for symbol in sorted((posix.intersection(glibc)).difference(bionic)): 200 print symbol 201 print 202 203 print 'in bionic but not glibc:' 204 205 allowed_stuff = (bsd_stuff | FORTIFY_stuff | linux_stuff | macro_stuff | 206 std_stuff | weird_stuff | libresolv_stuff | known) 207 for symbol in sorted((bionic - allowed_stuff).difference(glibc)): 208 if symbol in ndk_ignored: 209 symbol += '*' 210 print symbol 211 212 sys.exit(0) 213
