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gh-112529: Remove PyGC_Head from object pre-header in free-threaded build (#114564)

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* gh-112529: Remove PyGC_Head from object pre-header in free-threaded build

This avoids allocating space for PyGC_Head in the free-threaded build.
The GC implementation for free-threaded CPython does not use the
PyGC_Head structure.

 * The trashcan mechanism uses the `ob_tid` field instead of `_gc_prev`
   in the free-threaded build.
 * The GDB libpython.py file now determines the offset of the managed
   dict field based on whether the running process is a free-threaded
   build. Those are identified by the `ob_ref_local` field in PyObject.
 * Fixes `_PySys_GetSizeOf()` which incorrectly incorrectly included the
   size of `PyGC_Head` in the size of static `PyTypeObject`.
This commit is contained in:
Sam Gross 2024-02-01 15:29:19 -05:00 • committed by GitHub
parent 500ede0117
commit 587d480203
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GPG key ID: B5690EEEBB952194
9 changed files with 86 additions and 26 deletions
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5
Lib/test/test_sys.py
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@ -1392,6 +1392,7 @@ class SizeofTest(unittest.TestCase):
self.longdigit = sys.int_info.sizeof_digit
import _testinternalcapi
self.gc_headsize = _testinternalcapi.SIZEOF_PYGC_HEAD
self.managed_pre_header_size = _testinternalcapi.SIZEOF_MANAGED_PRE_HEADER
check_sizeof = test.support.check_sizeof
@ -1427,7 +1428,7 @@ class SizeofTest(unittest.TestCase):
def __sizeof__(self):
return int(self)
self.assertEqual(sys.getsizeof(OverflowSizeof(sys.maxsize)),
sys.maxsize + self.gc_headsize*2)
sys.maxsize + self.gc_headsize + self.managed_pre_header_size)
with self.assertRaises(OverflowError):
sys.getsizeof(OverflowSizeof(sys.maxsize + 1))
with self.assertRaises(ValueError):
@ -1650,7 +1651,7 @@ class SizeofTest(unittest.TestCase):
# type
# static type: PyTypeObject
fmt = 'P2nPI13Pl4Pn9Pn12PIPc'
s = vsize('2P' + fmt)
s = vsize(fmt)
check(int, s)
# class
s = vsize(fmt + # PyTypeObject