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1#!/usr/bin/env 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#
13import os
14import re
15import sys
16
17if len(sys.argv) != 2:
18    print "Usage: %s FILE" % sys.argv[0]
19    sys.exit(2)
20
21readelf = os.getenv("READELF", "readelf")
22
23start_pattern = re.compile("<([^>]*)>: \[0x([0-9a-f]+)-0x([0-9a-f]+)\]")
24rlen_pattern  = re.compile(".*rlen=([0-9]+)")
25
26def 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
34num_funcs = 0
35num_errors = 0
36func = False
37slots = 0
38rlen_sum = 0
39for 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))
54check_func(func, slots, rlen_sum)
55
56if num_errors == 0:
57    print "No errors detected in %u functions." % num_funcs
58else:
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)
65