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-rwxr-xr-xutils/analysis/objdiff.py54
1 files changed, 54 insertions, 0 deletions
diff --git a/utils/analysis/objdiff.py b/utils/analysis/objdiff.py
new file mode 100755
index 0000000000..dc51441bfa
--- /dev/null
+++ b/utils/analysis/objdiff.py
@@ -0,0 +1,54 @@
+#!/usr/bin/python
+import sys
+from 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"