GH-111808: Make the default value for `test.support.infinite_recursion()` conditional on compiler optimizations (GH-112223)

Co-authored-by: Victor Stinner <vstinner@python.org>
This commit is contained in:
Brett Cannon 2023-11-17 15:52:11 -08:00 committed by GitHub
parent dabc0d77b2
commit f489ace9e7
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4 changed files with 16 additions and 4 deletions

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@ -2120,13 +2120,21 @@ def set_recursion_limit(limit):
finally:
sys.setrecursionlimit(original_limit)
def infinite_recursion(max_depth=100):
def infinite_recursion(max_depth=None):
"""Set a lower limit for tests that interact with infinite recursions
(e.g test_ast.ASTHelpers_Test.test_recursion_direct) since on some
debug windows builds, due to not enough functions being inlined the
stack size might not handle the default recursion limit (1000). See
bpo-11105 for details."""
if max_depth < 3:
if max_depth is None:
if not python_is_optimized() or Py_DEBUG:
# Python built without compiler optimizations or in debug mode
# usually consumes more stack memory per function call.
# Unoptimized number based on what works under a WASI debug build.
max_depth = 50
else:
max_depth = 100
elif max_depth < 3:
raise ValueError("max_depth must be at least 3, got {max_depth}")
depth = get_recursion_depth()
depth = max(depth - 1, 1) # Ignore infinite_recursion() frame.

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@ -221,7 +221,7 @@ class MiscTest(unittest.TestCase):
self.assertRaises(Exc, func, Bad())
@support.no_tracing
@support.infinite_recursion(25)
@support.infinite_recursion()
def test_recursion(self):
# Check that comparison for recursive objects fails gracefully
from collections import UserList

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@ -5621,7 +5621,7 @@ class ForwardRefTests(BaseTestCase):
def cmp(o1, o2):
return o1 == o2
with infinite_recursion(25): # magic number, small but reasonable
with infinite_recursion():
r1 = namespace1()
r2 = namespace2()
self.assertIsNot(r1, r2)

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@ -0,0 +1,4 @@
Make the default value of ``test.support.infinite_recursion()`` to be
conditional based on whether optimizations were used when compiling the
interpreter. This helps with platforms like WASI whose stack size is greatly
restricted in debug builds.