Add a script for finding symbols in bionic that aren't in glibc.
Bug: 11156955
Change-Id: I9772f054f6a92b842531df084dee0ea9c28806be
diff --git a/libc/tools/check-symbols-glibc.py b/libc/tools/check-symbols-glibc.py
new file mode 100755
index 0000000..43b213f
--- /dev/null
+++ b/libc/tools/check-symbols-glibc.py
@@ -0,0 +1,120 @@
+#!/usr/bin/python
+
+import glob
+import os
+import re
+import string
+import subprocess
+import sys
+
+toolchain = os.environ['ANDROID_TOOLCHAIN']
+arch = re.sub(r'.*/linux-x86/([^/]+)/.*', r'\1', toolchain)
+
+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
+
+glibc = GetSymbolsFromSystemSo('libc.so.*', 'librt.so.*', 'libpthread.so.*', 'libresolv.so.*', 'libm.so.*')
+bionic = GetSymbolsFromAndroidSo('libc.so', 'libm.so')
+
+# bionic includes various BSD symbols to ease porting other BSD-licensed code.
+bsd_stuff = set([
+ 'getprogname',
+ 'setprogname',
+ 'strlcat',
+ 'strlcpy',
+ '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'
+])
+# 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'
+])
+# 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',
+])
+
+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:'
+for symbol in sorted((bionic - bsd_stuff - FORTIFY_stuff - linux_stuff - std_stuff - weird_stuff).difference(glibc)):
+ print symbol
+
+sys.exit(0)