utilities/ovs-parse-backtrace.in

   1 #! @PYTHON3@
   2 #
   3 # Copyright (c) 2012 Nicira, Inc.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at:
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 import optparse
  18 import os
  19 import re
  20 import subprocess
  21 import sys
  22
  23
  24 addr2line_cache = {}  # None if addr2line is missing or broken.
  25
  26
  27 def addr2line(binary, addr):
  28     global addr2line_cache
  29
  30     if addr2line_cache is None:
  31         return ""
  32
  33     if addr in addr2line_cache:
  34         return addr2line_cache[addr]
  35
  36     cmd = ["addr2line", "-f", "-s", "-e", binary, addr]
  37     try:
  38         proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
  39                                 stderr=subprocess.PIPE)
  40         lines = proc.stdout.readlines()
  41         failed = proc.returncode
  42     except OSError:
  43         failed = True
  44
  45     if failed:
  46         addr2line_cache = None
  47         return ""
  48
  49     lines = [l.strip() for l in lines]
  50     return " ".join(lines)
  51
  52
  53 def main():
  54     parser = optparse.OptionParser(version='@VERSION@',
  55                                    usage="usage: %prog [binary]",
  56                                    description="""\
  57 Parses the output of ovs-appctl backtrace producing a more human readable
  58 result.  Expected usage is for ovs-appctl backtrace to be piped in.""")
  59     options, args = parser.parse_args()
  60
  61     if len(args) > 1:
  62         parser.print_help()
  63         sys.exit(1)
  64
  65     if len(args) == 1:
  66         binary = args[0]
  67     else:
  68         binary = "@sbindir@/ovs-vswitchd"
  69         debug = "/usr/lib/debug%s.debug" % binary
  70         if os.path.exists(debug):
  71             binary = debug
  72
  73     print "Binary: %s\n" % binary
  74
  75     stdin = sys.stdin.read()
  76
  77     traces = []
  78     for trace in stdin.strip().split("\n\n"):
  79         lines = trace.splitlines()
  80         match = re.search(r'Count (\d+)', lines[0])
  81         if match:
  82             count = int(match.group(1))
  83         else:
  84             count = 0
  85         traces.append((lines[1:], count))
  86     traces = sorted(traces, key=(lambda x: x[1]), reverse=True)
  87
  88     for lines, count in traces:
  89         longest = max(len(l) for l in lines)
  90
  91         print "Backtrace Count: %d" % count
  92         for line in lines:
  93             match = re.search(r'\[(0x.*)]', line)
  94             if match:
  95                 print "%s %s" % (line.ljust(longest),
  96                                  addr2line(binary, match.group(1)))
  97             else:
  98                 print line
  99         print
 100
 101
 102 if __name__ == "__main__":
 103     main()