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#!/usr/bin/python
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# This script processes a `refcount' log, and finds out if any object leaked.
# It simply goes through the log, finds `AddRef' or `Ctor' lines, and then
# sees if they `Release' or `Dtor'. If not, it reports them as leaks.
# Please see README file in the same directory.
import sys
def print_output(allocation, obj_to_class):
'''Formats and prints output.'''
items = []
for obj, count, in allocation.iteritems():
# Adding items to a list, so we can sort them.
items.append((obj, count))
# Sorting by count.
items.sort(key=lambda item: item[1])
for obj, count, in items:
print "{obj} ({count}) @ {class_name}".format(obj=obj,
count=count,
class_name=obj_to_class[obj])
def process_log(log_lines):
'''Process through the log lines, and print out the result.
@param log_lines: List of strings.
'''
allocation = {}
class_count = {}
obj_to_class = {}
for log_line in log_lines:
if not log_line.startswith('<'):
continue
(class_name,
obj,
ignore,
operation,
count,) = log_line.strip('\r\n').split(' ')[:5]
# for AddRef/Release `count' is the refcount,
# for Ctor/Dtor it's the size.
if ((operation == 'AddRef' and count == '1') or
operation == 'Ctor'):
# Examples:
# <nsStringBuffer> 0x01AFD3B8 1 AddRef 1
# <PStreamNotifyParent> 0x08880BD0 8 Ctor (20)
class_count[class_name] = class_count.setdefault(class_name, 0) + 1
allocation[obj] = class_count[class_name]
obj_to_class[obj] = class_name
elif ((operation == 'Release' and count == '0') or
operation == 'Dtor'):
# Examples:
# <nsStringBuffer> 0x01AFD3B8 1 Release 0
# <PStreamNotifyParent> 0x08880BD0 8 Dtor (20)
if obj not in allocation:
print "An object was released that wasn't allocated!",
print obj, "@", class_name
else:
allocation.pop(obj)
obj_to_class.pop(obj)
# Printing out the result.
print_output(allocation, obj_to_class)
def print_usage():
print
print "Usage: find-leakers.py [log-file]"
print
print "If `log-file' provided, it will read that as the input log."
print "Else, it will read the stdin as the input log."
print
def main():
'''Main method of the script.'''
if len(sys.argv) == 1:
# Reading log from stdin.
process_log(sys.stdin.readlines())
elif len(sys.argv) == 2:
# Reading log from file.
with open(sys.argv[1], 'r') as log_file:
log_lines = log_file.readlines()
process_log(log_lines)
else:
print 'ERROR: Invalid number of arguments'
print_usage()
if __name__ == '__main__':
main()
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