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#!/usr/bin/python
import glob
import os
import re
import subprocess
import sys
only_unwanted = False
if len(sys.argv) > 1:
if sys.argv[1] in ('-u', '--unwanted'):
only_unwanted = True
toolchain = os.environ['ANDROID_TOOLCHAIN']
arch = re.sub(r'.*/linux-x86/([^/]+)/.*', r'\1', toolchain)
if arch == 'aarch64':
arch = 'arm64'
def GetSymbolsFromSo(so_file):
# Example readelf output:
# 264: 0001623c 4 FUNC GLOBAL DEFAULT 8 cabsf
# 266: 00016244 4 FUNC GLOBAL DEFAULT 8 dremf
# 267: 00019018 4 OBJECT GLOBAL DEFAULT 11 __fe_dfl_env
# 268: 00000000 0 FUNC GLOBAL DEFAULT UND __aeabi_dcmplt
r = re.compile(r' +\d+: [0-9a-f]+ +\d+ (I?FUNC|OBJECT) +\S+ +\S+ +\d+ (\S+)')
symbols = set()
for line in subprocess.check_output(['readelf', '--dyn-syms', '-W', so_file]).split('\n'):
if ' HIDDEN ' in line or ' UND ' in line:
continue
m = r.match(line)
if m:
symbol = m.group(2)
symbol = re.sub('@.*', '', symbol)
symbols.add(symbol)
return symbols
def GetSymbolsFromAndroidSo(*files):
symbols = set()
for f in files:
symbols = symbols | GetSymbolsFromSo('%s/system/lib64/%s' % (os.environ['ANDROID_PRODUCT_OUT'], f))
return symbols
def GetSymbolsFromSystemSo(*files):
symbols = set()
for f in files:
f = glob.glob('/lib/x86_64-linux-gnu/%s' % f)[-1]
symbols = symbols | GetSymbolsFromSo(f)
return symbols
def MangleGlibcNameToBionic(name):
if name in glibc_to_bionic_names:
return glibc_to_bionic_names[name]
return name
def GetNdkIgnored():
global arch
symbols = set()
files = glob.glob('%s/ndk/build/tools/unwanted-symbols/%s/*' %
(os.getenv('ANDROID_BUILD_TOP'), arch))
for f in files:
symbols |= set(open(f, 'r').read().splitlines())
return symbols
glibc_to_bionic_names = {
'__res_init': 'res_init',
'__res_mkquery': 'res_mkquery',
'__res_query': 'res_query',
'__res_search': 'res_search',
'__xpg_basename': '__gnu_basename',
}
glibc = GetSymbolsFromSystemSo('libc.so.*', 'librt.so.*', 'libpthread.so.*', 'libresolv.so.*', 'libm.so.*')
bionic = GetSymbolsFromAndroidSo('libc.so', 'libm.so')
ndk_ignored = GetNdkIgnored()
glibc = map(MangleGlibcNameToBionic, glibc)
# bionic includes various BSD symbols to ease porting other BSD-licensed code.
bsd_stuff = set([
'basename_r',
'dirname_r',
'fgetln',
'fpurge',
'funopen',
'gamma_r',
'gammaf_r',
'getprogname',
'setprogname',
'strlcat',
'strlcpy',
'sys_signame',
'wcslcat',
'wcslcpy'
])
# Some symbols are part of the FORTIFY implementation.
FORTIFY_stuff = set([
'__FD_CLR_chk',
'__FD_ISSET_chk',
'__FD_SET_chk',
'__stack_chk_guard',
'__stpncpy_chk2',
'__strchr_chk',
'__strlcat_chk',
'__strlcpy_chk',
'__strlen_chk',
'__strncpy_chk2',
'__strrchr_chk',
'__umask_chk'
])
# Some symbols are used to implement public macros.
macro_stuff = set([
'__assert2',
'__errno',
'__fe_dfl_env',
'__get_h_errno',
'__fpclassifyd',
'__isfinite',
'__isfinitef',
'__isfinitel',
'__isnormal',
'__isnormalf',
'__isnormall',
'__sF',
'__pthread_cleanup_pop',
'__pthread_cleanup_push',
])
# bionic exposes various Linux features that glibc doesn't.
linux_stuff = set([
'getauxval',
'gettid',
'tgkill'
])
# Some standard stuff isn't yet in the versions of glibc we're using.
std_stuff = set([
'at_quick_exit',
'c16rtomb',
'c32rtomb',
'mbrtoc16',
'mbrtoc32',
])
# These have mangled names in glibc, with a macro taking the "obvious" name.
weird_stuff = set([
'fstat',
'fstat64',
'fstatat',
'fstatat64',
'isfinite',
'isfinitef',
'isfinitel',
'isnormal',
'isnormalf',
'isnormall',
'lstat',
'lstat64',
'mknod',
'mknodat',
'stat',
'stat64',
'optreset',
'sigsetjmp',
])
# These exist in glibc, but under slightly different names (generally one extra
# or one fewer _). TODO: check against glibc names.
libresolv_stuff = set([
'__res_send_setqhook',
'__res_send_setrhook',
'_resolv_flush_cache_for_net',
'_resolv_set_nameservers_for_net',
'dn_expand',
'nsdispatch',
])
# Implementation details we know we export (and can't get away from).
known = set([
'_ctype_',
'__libc_init',
])
if not only_unwanted:
print 'glibc:'
for symbol in sorted(glibc):
print symbol
print
print 'bionic:'
for symbol in sorted(bionic):
print symbol
print
print 'in bionic but not glibc:'
allowed_stuff = (bsd_stuff | FORTIFY_stuff | linux_stuff | macro_stuff |
std_stuff | weird_stuff | libresolv_stuff | known)
for symbol in sorted((bionic - allowed_stuff).difference(glibc)):
if symbol in ndk_ignored:
symbol += '*'
print symbol
sys.exit(0)
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