tools/debug/core/error_ref_leak.py

#!/usr/bin/env python2.7
#
# Copyright 2017 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Reads stdin to find error_refcount log lines, and prints reference leaks
# to stdout

# usege: python error_ref_leak < logfile.txt

import sys
import re

data = sys.stdin.readlines()

errs = []
for line in data:
  # if we care about the line
  if re.search(r'error.cc', line):
    # str manip to cut off left part of log line
    line = line.partition('error.cc:')[-1]
    line = re.sub(r'\d+] ', r'', line)
    line = line.strip().split()
    err = line[0].strip(":")
    if line[1] == "create":
      assert(err not in errs)
      errs.append(err)
    elif line[0] == "realloc":
      errs.remove(line[1])
      errs.append(line[3])
    # explicitly look for the last dereference 
    elif line[1] == "1" and line[3] == "0":
      assert(err in errs)
      errs.remove(err)

print "leaked:", errs