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bpo-46329: Reduce default recursion to 800 if Py_DEBUG is enabled. #31033

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bpo-46329: Reduce default recursion to 800 if Py_DEBUG is enabled. #31033

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Reduce default recursion to 800 if Py_DEBUG is enabled. Prevents C st…
markshannon Jan 31, 2022
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markshannon Jan 31, 2022
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6 changes: 5 additions & 1 deletion Include/internal/pycore_ceval.h
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Expand Up @@ -13,7 +13,11 @@ struct pyruntimestate;
struct _ceval_runtime_state;

#ifndef Py_DEFAULT_RECURSION_LIMIT
# define Py_DEFAULT_RECURSION_LIMIT 1000
# ifdef Py_DEBUG
# define Py_DEFAULT_RECURSION_LIMIT 850
# else
# define Py_DEFAULT_RECURSION_LIMIT 1000
# endif
#endif

#include "pycore_interp.h" // PyInterpreterState.eval_frame
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2 changes: 1 addition & 1 deletion Lib/test/test_compile.py
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Expand Up @@ -109,7 +109,7 @@ def __getitem__(self, key):
self.assertEqual(d['z'], 12)

def test_extended_arg(self):
longexpr = 'x = x or ' + '-x' * 2500
longexpr = 'x = x or ' + '-x' * 2000
g = {}
code = '''
def f(x):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2022-01-31-13-50-05.bpo-46329.KlwVAt.rst
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@@ -0,0 +1,2 @@
Temporarily reduce default recursion to 800 for debug builds. This prevents
C stack overflows with Clang debug builds.