From a85f3695ef71352316c24b2497ddd9f089edd0c3 Mon Sep 17 00:00:00 2001
From: Maurus Cuelenaere <mcuelenaere@gmail.com>
Date: Wed, 1 Jul 2009 10:41:34 +0000
Subject: Add (better IMO) alternative for utils/analyis/objdiff.py (taken from
 Linux kernel, scripts/bloat-o-meter.py)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21588 a1c6a512-1295-4272-9138-f99709370657
---
 utils/analysis/bloat-o-meter.py | 80 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100755 utils/analysis/bloat-o-meter.py

diff --git a/utils/analysis/bloat-o-meter.py b/utils/analysis/bloat-o-meter.py
new file mode 100755
index 0000000000..311b90cdc3
--- /dev/null
+++ b/utils/analysis/bloat-o-meter.py
@@ -0,0 +1,80 @@
+#!/usr/bin/python
+#
+# Copyright 2004 Matt Mackall <mpm@selenic.com>
+#
+# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+import sys, os, re
+
+def usage():
+    sys.stderr.write("Usage: %s file1 file2\n" % sys.argv[0])
+    sys.exit(-1)
+
+if len(sys.argv) < 3:
+    usage()
+
+for f in sys.argv[1], sys.argv[2]:
+    if not os.path.exists(f):
+        sys.stderr.write("Error: file '%s' does not exist\n" % f)
+        usage()
+
+nm_args = " ".join([x for x in sys.argv[3:]])
+def getsizes(file):
+    sym = {}
+    for l in os.popen("nm --size-sort %s %s" % (nm_args, file)).readlines():
+    	l = l.strip()
+	# Skip empty lines
+        if not len(l): continue
+	# Skip archive members
+        if len(l.split()) == 1 and l.endswith(':'):
+          continue
+        size, type, name = l.split()
+        if type in "tTdDbBrR":
+            if "." in name: name = "static." + name.split(".")[0]
+            sym[name] = sym.get(name, 0) + int(size, 16)
+    for l in os.popen("readelf -S " + file).readlines():
+        x = l.split()
+        if len(x)<6 or x[1] != ".rodata": continue
+        sym[".rodata"] = int(x[5], 16)
+    return sym
+
+old = getsizes(sys.argv[1])
+new = getsizes(sys.argv[2])
+grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
+delta, common = [], {}
+
+for a in old:
+    if a in new:
+        common[a] = 1
+
+for name in old:
+    if name not in common:
+        remove += 1
+        down += old[name]
+        delta.append((-old[name], name))
+
+for name in new:
+    if name not in common:
+        add += 1
+        up += new[name]
+        delta.append((new[name], name))
+
+for name in common:
+        d = new.get(name, 0) - old.get(name, 0)
+        if d>0: grow, up = grow+1, up+d
+        if d<0: shrink, down = shrink+1, down-d
+        delta.append((d, name))
+
+delta.sort()
+delta.reverse()
+
+print "%-48s %7s %7s %+7s" % ("function", "old", "new", "delta")
+for d, n in delta:
+    if d: print "%-48s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)
+print "-"*78
+total="(add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s)%%s\nTotal: %s bytes"\
+    % (add, remove, grow, shrink, up, -down, up-down)
+print total % (" "*(80-len(total)))
-- 
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