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#!/usr/bin/python
import sys
from subprocess import Popen, PIPE
if len(sys.argv) != 3:
print """%s usage:
%s obj1 obj2
Calculate per-symbol and total size differences between obj1 and obj2,
which may be any files that nm can read""" % ((sys.argv[0],)*2)
sys.exit(2)
obj1 = sys.argv[1]
obj2 = sys.argv[2]
def getsyms(obj):
proc = Popen(args=['nm', '-S', '-t', 'd', obj], stdout=PIPE, stderr=PIPE)
out, err = proc.communicate()
if err:
print "nm reported an error:\n"
print err
sys.exit(1)
d = {}
for l in out.splitlines():
l = l.strip().split()
if len(l) == 4:
d[l[3]] = int(l[1])
return d
diff = 0
d1 = getsyms(obj1)
d2 = getsyms(obj2)
l = [(k,v) for k,v in sorted(d1.items()) if k not in d2]
if l:
print "only in %s" % obj1
print ''.join(" %6d %s\n" % (v,k) for k,v in l)
diff -= sum(v for k,v in l)
l = [(k,v) for k,v in sorted(d2.items()) if k not in d1]
if l:
print "only in %s" % obj2
print ''.join("%6d %s\n" % (v,k) for k,v in l)
diff += sum(v for k,v in l)
l = [(k,v,d2[k]) for k,v in sorted(d1.items()) if k in d2 and d2[k] != v]
if l:
print "different sizes in %s and %s:" %(obj1, obj2)
print ''.join(" %6d %6d %s\n" % (v1,v2,k) for k,v1,v2 in l)
diff += sum(v2-v1 for k,v1,v2 in l)
if diff:
print "total size difference: %+d" % diff
else:
print "total size difference: 0"
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