linux/scripts/bloat-o-meter
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   1#!/usr/bin/python
   2#
   3# Copyright 2004 Matt Mackall <mpm@selenic.com>
   4#
   5# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
   6#
   7# This software may be used and distributed according to the terms
   8# of the GNU General Public License, incorporated herein by reference.
   9
  10import sys, os, re
  11
  12if len(sys.argv) != 3:
  13    sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
  14    sys.exit(-1)
  15
  16def getsizes(file):
  17    sym = {}
  18    for l in os.popen("nm --size-sort " + file).readlines():
  19        size, type, name = l[:-1].split()
  20        if type in "tTdDbBrR":
  21            # strip generated symbols
  22            if name[:6] == "__mod_": continue
  23            # function names begin with '.' on 64-bit powerpc
  24            if "." in name[1:]: name = "static." + name.split(".")[0]
  25            sym[name] = sym.get(name, 0) + int(size, 16)
  26    return sym
  27
  28old = getsizes(sys.argv[1])
  29new = getsizes(sys.argv[2])
  30grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  31delta, common = [], {}
  32
  33for a in old:
  34    if a in new:
  35        common[a] = 1
  36
  37for name in old:
  38    if name not in common:
  39        remove += 1
  40        down += old[name]
  41        delta.append((-old[name], name))
  42
  43for name in new:
  44    if name not in common:
  45        add += 1
  46        up += new[name]
  47        delta.append((new[name], name))
  48
  49for name in common:
  50        d = new.get(name, 0) - old.get(name, 0)
  51        if d>0: grow, up = grow+1, up+d
  52        if d<0: shrink, down = shrink+1, down-d
  53        delta.append((d, name))
  54
  55delta.sort()
  56delta.reverse()
  57
  58print "add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  59      (add, remove, grow, shrink, up, -down, up-down)
  60print "%-40s %7s %7s %+7s" % ("function", "old", "new", "delta")
  61for d, n in delta:
  62    if d: print "%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)
  63
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