LXR linux/scripts/bloat-o-meter

   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 "tTdDbB":
  21            # function names begin with '.' on 64-bit powerpc
  22            if "." in name[1:]: name = "static." + name.split(".")[0]
  23            sym[name] = sym.get(name, 0) + int(size, 16)
  24    return sym
  25
  26old = getsizes(sys.argv[1])
  27new = getsizes(sys.argv[2])
  28grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  29delta, common = [], {}
  30
  31for a in old:
  32    if a in new:
  33        common[a] = 1
  34
  35for name in old:
  36    if name not in common:
  37        remove += 1
  38        down += old[name]
  39        delta.append((-old[name], name))
  40
  41for name in new:
  42    if name not in common:
  43        add += 1
  44        up += new[name]
  45        delta.append((new[name], name))
  46
  47for name in common:
  48        d = new.get(name, 0) - old.get(name, 0)
  49        if d>0: grow, up = grow+1, up+d
  50        if d<0: shrink, down = shrink+1, down-d
  51        delta.append((d, name))
  52
  53delta.sort()
  54delta.reverse()
  55
  56print "add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  57      (add, remove, grow, shrink, up, -down, up-down)
  58print "%-40s %7s %7s %+7s" % ("function", "old", "new", "delta")
  59for d, n in delta:
  60    if d: print "%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)
  61