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#!/usr/bin/python
#
# Find exported symbols that can be made private.
#
# Noting that (a) parsing these commands is a pain, the output is quite irregular and (b) I'm fumbling in the
# dark here, trying to guess what exactly constitutes an "import" vs an "export" of a symbol, linux linking
# is rather complex.
import subprocess
import sys
import re
exported_symbols = set()
imported_symbols = set()
subprocess_find = subprocess.Popen("find ./instdir -name *.so", stdout=subprocess.PIPE, shell=True)
with subprocess_find.stdout as txt:
for line in txt:
sharedlib = line.strip()
# look for exported symbols
subprocess_nm = subprocess.Popen("nm -D " + sharedlib, stdout=subprocess.PIPE, shell=True)
with subprocess_nm.stdout as txt2:
# We are looking for lines something like:
# 0000000000036ed0 T flash_component_getFactory
line_regex = re.compile(r'^[0-9a-fA-F]+ T ')
for line2 in txt2:
line2 = line2.strip()
if line_regex.match(line2):
exported_symbols.add(line2.split(" ")[2])
# look for imported symbols
subprocess_objdump = subprocess.Popen("objdump -T " + sharedlib, stdout=subprocess.PIPE, shell=True)
with subprocess_objdump.stdout as txt2:
# ignore some header bumpf
txt2.readline()
txt2.readline()
txt2.readline()
txt2.readline()
# We are looking for lines something like:
# 0000000000000000 DF *UND* 0000000000000000 _ZN16FilterConfigItem10WriteInt32ERKN3rtl8OUStringEi
for line2 in txt2:
line2 = line2.strip()
tokens = line2.split(" ")
if len(tokens) < 7 or not(tokens[7].startswith("*UND*")): continue
sym = tokens[len(tokens)-1]
imported_symbols.add(sym)
# look for imported symbols in executables
subprocess_find = subprocess.Popen("find ./instdir -name *.bin", stdout=subprocess.PIPE, shell=True)
with subprocess_find.stdout as txt:
for line in txt:
executable = line.strip()
# look for exported symbols
subprocess_nm = subprocess.Popen("nm -D " + executable + " | grep -w U", stdout=subprocess.PIPE, shell=True)
with subprocess_nm.stdout as txt2:
# We are looking for lines something like:
# U sal_detail_deinitialize
for line2 in txt2:
line2 = line2.strip()
sym = line2.split(" ")[1]
imported_symbols.add(sym)
diff = exported_symbols - imported_symbols
print("exported = " + str(len(exported_symbols)))
print("imported = " + str(len(imported_symbols)))
print("diff = " + str(len(diff)))
# todo process these with c++filt
#for sym in diff:
# if "Sd" in sym:
# print sym
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