error_ref_leak.py

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#!/usr/bin/env python3
#
# 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
 
# usage: python error_ref_leak < logfile.txt
 
import re
import sys
 
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))