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gh-139951: Tests on tuple GC tracking (#140575)

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Mikhail Efimov 2025-10-28 12:55:41 +03:00 • committed by GitHub
parent d26686a7f8
commit 88ad41fa34
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2 changed files with 43 additions and 6 deletions
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30
Lib/test/test_tuple.py
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@ -290,12 +290,18 @@ def test_repr(self):
self.assertEqual(repr(a0), "()")
self.assertEqual(repr(a2), "(0, 1, 2)")
# Checks that t is not tracked without any GC collections.
def _not_tracked_instantly(self, t):
self.assertFalse(gc.is_tracked(t), t)
# Checks that t is not tracked after GC collection.
def _not_tracked(self, t):
# Nested tuples can take several collections to untrack
gc.collect()
gc.collect()
self.assertFalse(gc.is_tracked(t), t)
# Checks that t continues to be tracked even after GC collection.
def _tracked(self, t):
self.assertTrue(gc.is_tracked(t), t)
gc.collect()
@ -307,13 +313,19 @@ def test_track_literals(self):
# Test GC-optimization of tuple literals
x, y, z = 1.5, "a", []
self._not_tracked(())
self._not_tracked((1,))
self._not_tracked((1, 2))
self._not_tracked((1, 2, "a"))
self._not_tracked((1, 2, (None, True, False, ()), int))
self._not_tracked((object(),))
# We check that those objects aren't tracked at all.
# It's essential for the GC performance, see gh-139951.
self._not_tracked_instantly(())
self._not_tracked_instantly((1,))
self._not_tracked_instantly((1, 2))
self._not_tracked_instantly((1, 2, "a"))
self._not_tracked_instantly((1, 2) * 5)
self._not_tracked_instantly((12, 10**10, 'a_' * 100))
self._not_tracked_instantly((object(),))
self._not_tracked(((1, x), y, (2, 3)))
self._not_tracked((1, 2, (None, True, False, ()), int))
self._not_tracked((object(), ()))
# Tuples with mutable elements are always tracked, even if those
# elements are not tracked right now.
@ -343,6 +355,12 @@ def check_track_dynamic(self, tp, always_track):
self._tracked(tp(tuple([obj]) for obj in [x, y, z]))
self._tracked(tuple(tp([obj]) for obj in [x, y, z]))
t = tp([1, x, y, z])
self.assertEqual(type(t), tp)
self._tracked(t)
self.assertEqual(type(t[:]), tuple)
self._tracked(t[:])
@support.cpython_only
def test_track_dynamic(self):
# Test GC-optimization of dynamically constructed tuples.