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