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unwcheck.py
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1 #!/usr/bin/python
2 #
3 # Usage: unwcheck.py FILE
4 #
5 # This script checks the unwind info of each function in file FILE
6 # and verifies that the sum of the region-lengths matches the total
7 # length of the function.
8 #
9 # Based on a shell/awk script originally written by Harish Patil,
10 # which was converted to Perl by Matthew Chapman, which was converted
11 # to Python by David Mosberger.
12 #
13 import os
14 import re
15 import sys
16 
17 if len(sys.argv) != 2:
18  print "Usage: %s FILE" % sys.argv[0]
19  sys.exit(2)
20 
21 readelf = os.getenv("READELF", "readelf")
22 
23 start_pattern = re.compile("<([^>]*)>: \[0x([0-9a-f]+)-0x([0-9a-f]+)\]")
24 rlen_pattern = re.compile(".*rlen=([0-9]+)")
25 
26 def check_func (func, slots, rlen_sum):
27  if slots != rlen_sum:
28  global num_errors
29  num_errors += 1
30  if not func: func = "[%#x-%#x]" % (start, end)
31  print "ERROR: %s: %lu slots, total region length = %lu" % (func, slots, rlen_sum)
32  return
33 
34 num_funcs = 0
35 num_errors = 0
36 func = False
37 slots = 0
38 rlen_sum = 0
39 for line in os.popen("%s -u %s" % (readelf, sys.argv[1])):
40  m = start_pattern.match(line)
41  if m:
42  check_func(func, slots, rlen_sum)
43 
44  func = m.group(1)
45  start = long(m.group(2), 16)
46  end = long(m.group(3), 16)
47  slots = 3 * (end - start) / 16
48  rlen_sum = 0L
49  num_funcs += 1
50  else:
51  m = rlen_pattern.match(line)
52  if m:
53  rlen_sum += long(m.group(1))
54 check_func(func, slots, rlen_sum)
55 
56 if num_errors == 0:
57  print "No errors detected in %u functions." % num_funcs
58 else:
59  if num_errors > 1:
60  err="errors"
61  else:
62  err="error"
63  print "%u %s detected in %u functions." % (num_errors, err, num_funcs)
64  sys.exit(1)