[Python-bugs-list] [ python-Bugs-549731 ] Unicode encoders appears to leak references

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Bugs item #549731, was opened at 2002-04-28 19:17
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Category: Unicode
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Mark Hammond (mhammond)
Assigned to: M.-A. Lemburg (lemburg)
Summary: Unicode encoders appears to leak references

Initial Comment:
Note the following Debug Python session:

>>> s=u"anything"
[8189 refs]
>>> v=s.encode("utf8")
[10967 refs]
>>> v=s.encode("utf8")
[10968 refs]
>>> v=s.encode("utf8")
[10969 refs]
>>> v=s.encode("utf8")
[10970 refs]

Each call to encode is losing a reference.  Attaching a
test program that demonstrates this in more detail. 
The output from my test program is:

After 10000 iterations, lost 12850 references
[15227 refs]

and for 100000:
After 100000 iterations, lost 102850 references
[105227 refs]

etc.

As far as I can tell, this appears in all Python 2.x
versions.

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>Comment By: Mark Hammond (mhammond)
Date: 2002-07-18 09:07

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A tickle for Marc, assuming his days aren't quite *that*
long <wink>.  Just give the OK and I will check it in.

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Comment By: Neal Norwitz (nnorwitz)
Date: 2002-06-05 03:25

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Basically the code in the report would be fine.
Purify *should* catch anything which causes the leak.
So:
    s = u'anything'
    assert(s.encode('utf-8') == s.encode('utf-8'))

should work.  Perhaps, there is already a test for this?
and purify didn't report leaks.

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Comment By: M.-A. Lemburg (lemburg)
Date: 2002-06-04 17:20

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I'll have a look later today.

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Comment By: Mark Hammond (mhammond)
Date: 2002-06-04 14:42

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damn sourceforge - it went to the trouble of asking my email
address when I submitted without being logged in, but it
doesn't seem to have done anything with it - so that was me
just incase you weren't sure :)

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Comment By: Nobody/Anonymous (nobody)
Date: 2002-06-04 14:39

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I'm not sure what sort of test you are suggesting I add.  I
think the patch is pretty obvious and reasonable, so MAL
should just check it in or assign it back to me <wink>. 
Earlier the better really.

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Comment By: Neal Norwitz (nnorwitz)
Date: 2002-06-04 11:35

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Patch makes sense to me.
If you add a test, I may be able to catch the problem w/purify
next time I run it (if purify works).

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Comment By: Mark Hammond (mhammond)
Date: 2002-04-28 20:39

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Oops - too quick.  All calls to _PyCodec_Lookup() leak.

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Comment By: Mark Hammond (mhammond)
Date: 2002-04-28 20:05

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Found it :)  Attaching patch.

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Comment By: Mark Hammond (mhammond)
Date: 2002-04-28 19:26

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s/decode/encode/ :)  Also meant to mention problem not
restricted to UTF8 - changing the encoding in the text file
to anything other than 'ascii' seems to leak in the same way.

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