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bpo-45947: Place dict and values pointer at fixed (negative) offset just before GC header. (GH-29879)

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* Place __dict__ immediately before GC header for plain Python objects.

* Fix up lazy dict creation logic to use managed dict pointers.

* Manage values pointer, placing them directly before managed dict pointers.

* Convert hint-based load/store attr specialization target managed dict classes.

* Specialize LOAD_METHOD for managed dict objects.

* Remove unsafe _PyObject_GC_Calloc function.

* Remove unsafe _PyObject_GC_Malloc() function.

* Add comment explaning use of Py_TPFLAGS_MANAGED_DICT.
This commit is contained in:
Mark Shannon 2021-12-07 16:02:53 +00:00 • committed by GitHub
parent c7e7a4b969
commit 8319114fee
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19 changed files with 260 additions and 285 deletions
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4
Lib/test/test_sys.py
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@ -1421,8 +1421,8 @@ class SizeofTest(unittest.TestCase):
check((1,2,3), vsize('') + 3*self.P)
# type
# static type: PyTypeObject
fmt = 'P2nPI13Pl4Pn9Pn12PIPP'
s = vsize(fmt)
fmt = 'P2nPI13Pl4Pn9Pn12PIP'
s = vsize('2P' + fmt)
check(int, s)
# class
s = vsize(fmt + # PyTypeObject