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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455#!/usr/bin/pythonimport sysfrom 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")