[issue25274] sys.setrecursionlimit() must fail if the current recursion depth is higher than the new low-water mark
STINNER Victor
report at bugs.python.org
Fri Oct 2 00:07:11 CEST 2015
STINNER Victor added the comment:
The overflowed flag was introduced 8 years ago (near the release of Python 3.0) by the following changeset:
changeset: 42013:cd125fe83051
user: Martin v. Löwis <martin at v.loewis.de>
date: Sun Jun 10 09:51:05 2007 +0000
files: Include/ceval.h Include/pystate.h Include/stringobject.h Include/unicodeobject.h Lib/test/test_frozen.py Lib/test/test_new.py Lib/test/test
description:
Make identifiers str (not str8) objects throughout.
This affects the parser, various object implementations,
and all places that put identifiers into C string literals.
In testing, a number of crashes occurred as code would
fail when the recursion limit was reached (such as the
Unicode interning dictionary having key/value pairs where
key is not value). To solve these, I added an overflowed
flag, which allows for 50 more recursions after the
limit was reached and the exception was raised, and
a recursion_critical flag, which indicates that recursion
absolutely must be allowed, i.e. that a certain call
must not cause a stack overflow exception.
There are still some places where both str and str8 are
accepted as identifiers; these should eventually be
removed.
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