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"""
PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
--------------------------------------------
1. This LICENSE AGREEMENT is between the Python Software Foundation
("PSF"), and the Individual or Organization ("Licensee") accessing and
otherwise using this software ("Python") in source or binary form and
its associated documentation.
2. Subject to the terms and conditions of this License Agreement, PSF
hereby grants Licensee a nonexclusive, royalty-free, world-wide
license to reproduce, analyze, test, perform and/or display publicly,
prepare derivative works, distribute, and otherwise use Python
alone or in any derivative version, provided, however, that PSF's
License Agreement and PSF's notice of copyright, i.e., "Copyright (c)
2001, 2002, 2003, 2004 Python Software Foundation; All Rights Reserved"
are retained in Python alone or in any derivative version prepared
by Licensee.
3. In the event Licensee prepares a derivative work that is based on
or incorporates Python or any part thereof, and wants to make
the derivative work available to others as provided herein, then
Licensee hereby agrees to include in any such work a brief summary of
the changes made to Python.
4. PSF is making Python available to Licensee on an "AS IS"
basis. PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND
DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT
INFRINGE ANY THIRD PARTY RIGHTS.
5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,
OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
6. This License Agreement will automatically terminate upon a material
breach of its terms and conditions.
7. Nothing in this License Agreement shall be deemed to create any
relationship of agency, partnership, or joint venture between PSF and
Licensee. This License Agreement does not grant permission to use PSF
trademarks or trade name in a trademark sense to endorse or promote
products or services of Licensee, or any third party.
8. By copying, installing or otherwise using Python, Licensee
agrees to be bound by the terms and conditions of this License
Agreement.
"""
#! /usr/bin/env python
"""
combinerefs path
A helper for analyzing PYTHONDUMPREFS output.
When the PYTHONDUMPREFS envar is set in a debug build, at Python shutdown
time Py_Finalize() prints the list of all live objects twice: first it
prints the repr() of each object while the interpreter is still fully intact.
After cleaning up everything it can, it prints all remaining live objects
again, but the second time just prints their addresses, refcounts, and type
names (because the interpreter has been torn down, calling repr methods at
this point can get into infinite loops or blow up).
Save all this output into a file, then run this script passing the path to
that file. The script finds both output chunks, combines them, then prints
a line of output for each object still alive at the end:
address refcnt typename repr
address is the address of the object, in whatever format the platform C
produces for a %p format code.
refcnt is of the form
"[" ref "]"
when the object's refcount is the same in both PYTHONDUMPREFS output blocks,
or
"[" ref_before "->" ref_after "]"
if the refcount changed.
typename is object->ob_type->tp_name, extracted from the second PYTHONDUMPREFS
output block.
repr is repr(object), extracted from the first PYTHONDUMPREFS output block.
CAUTION: If object is a container type, it may not actually contain all the
objects shown in the repr: the repr was captured from the first output block,
and some of the containees may have been released since then. For example,
it's common for the line showing the dict of interned strings to display
strings that no longer exist at the end of Py_Finalize; this can be recognized
(albeit painfully) because such containees don't have a line of their own.
The objects are listed in allocation order, with most-recently allocated
printed first, and the first object allocated printed last.
Simple examples:
00857060 [14] str '__len__'
The str object '__len__' is alive at shutdown time, and both PYTHONDUMPREFS
output blocks said there were 14 references to it. This is probably due to
C modules that intern the string "__len__" and keep a reference to it in a
file static.
00857038 [46->5] tuple ()
46-5 = 41 references to the empty tuple were removed by the cleanup actions
between the times PYTHONDUMPREFS produced output.
00858028 [1025->1456] str '<dummy key>'
The string '<dummy key>', which is used in dictobject.c to overwrite a real
key that gets deleted, grew several hundred references during cleanup. It
suggests that stuff did get removed from dicts by cleanup, but that the dicts
themselves are staying alive for some reason. """
import re
import sys
# Generate lines from fileiter. If whilematch is true, continue reading
# while the regexp object pat matches line. If whilematch is false, lines
# are read so long as pat doesn't match them. In any case, the first line
# that doesn't match pat (when whilematch is true), or that does match pat
# (when whilematch is false), is lost, and fileiter will resume at the line
# following it.
def read(fileiter, pat, whilematch):
for line in fileiter:
if bool(pat.match(line)) == whilematch:
yield line
else:
break
def combine(fname):
f = file(fname)
fi = iter(f)
for line in read(fi, re.compile(r'^Remaining objects:$'), False):
pass
crack = re.compile(r'([a-zA-Z\d]+) \[(\d+)\] (.*)')
addr2rc = {}
addr2guts = {}
before = 0
for line in read(fi, re.compile(r'^Remaining object addresses:$'), False):
m = crack.match(line)
if m:
addr, addr2rc[addr], addr2guts[addr] = m.groups()
before += 1
else:
print '??? skipped:', line
after = 0
for line in read(fi, crack, True):
after += 1
m = crack.match(line)
assert m
addr, rc, guts = m.groups() # guts is type name here
if addr not in addr2rc:
print '??? new object created while tearing down:', line.rstrip()
continue
print addr,
if rc == addr2rc[addr]:
print '[%s]' % rc,
else:
print '[%s->%s]' % (addr2rc[addr], rc),
print guts, addr2guts[addr]
f.close()
print "%d objects before, %d after" % (before, after)
if __name__ == '__main__':
combine(sys.argv[1])
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