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gh-134248 test_getallocatedblocks pre-check to ignore immortalized strings (#134871)

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When sanity checking against gettotalrefcount(), we exclude the blocks for
immortalized strings since their references are not tracked/reported. This
now matches refleak.py's book-keeping using the same functions.
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tpburns 2025-06-03 12:00:25 -04:00 committed by GitHub
parent 3612d8f517
commit 54ca55978e
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1 changed files with 6 additions and 17 deletions
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23
Lib/test/test_sys.py
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@ -1135,23 +1135,12 @@ class SysModuleTest(unittest.TestCase):
b = sys.getallocatedblocks()
self.assertLessEqual(b, a)
try:
# While we could imagine a Python session where the number of
# multiple buffer objects would exceed the sharing of references,
# it is unlikely to happen in a normal test run.
#
# In free-threaded builds each code object owns an array of
# pointers to copies of the bytecode. When the number of
# code objects is a large fraction of the total number of
# references, this can cause the total number of allocated
# blocks to exceed the total number of references.
#
# For some reason, iOS seems to trigger the "unlikely to happen"
# case reliably under CI conditions. It's not clear why; but as
# this test is checking the behavior of getallocatedblock()
# under garbage collection, we can skip this pre-condition check
# for now. See GH-130384.
if not support.Py_GIL_DISABLED and not support.is_apple_mobile:
self.assertLess(a, sys.gettotalrefcount())
# The reported blocks will include immortalized strings, but the
# total ref count will not. This will sanity check that among all
# other objects (those eligible for garbage collection) there
# are more references being tracked than allocated blocks.
interned_immortal = sys.getunicodeinternedsize(_only_immortal=True)
self.assertLess(a - interned_immortal, sys.gettotalrefcount())
except AttributeError:
# gettotalrefcount() not available
pass