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bpo-45340: Don't create object dictionaries unless actually needed (GH-28802)

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* Never change types' cached keys. It could invalidate inline attribute objects.

* Lazily create object dictionaries.

* Update specialization of LOAD/STORE_ATTR.

* Don't update shared keys version for deletion of value.

* Update gdb support to handle instance values.

* Rename SPLIT_KEYS opcodes to INSTANCE_VALUE.
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Mark Shannon 2021-10-13 14:19:34 +01:00 • committed by GitHub
parent 97308dfcdc
commit a8b9350964
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18 changed files with 721 additions and 400 deletions
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10
Lib/test/test_sys.py
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@ -1409,7 +1409,7 @@ class SizeofTest(unittest.TestCase):
check((1,2,3), vsize('') + 3*self.P)
# type
# static type: PyTypeObject
fmt = 'P2nPI13Pl4Pn9Pn11PIPP'
fmt = 'P2nPI13Pl4Pn9Pn12PIPP'
s = vsize(fmt)
check(int, s)
# class
@ -1422,15 +1422,15 @@ class SizeofTest(unittest.TestCase):
'5P')
class newstyleclass(object): pass
# Separate block for PyDictKeysObject with 8 keys and 5 entries
check(newstyleclass, s + calcsize(DICT_KEY_STRUCT_FORMAT) + 8 + 5*calcsize("n2P"))
check(newstyleclass, s + calcsize(DICT_KEY_STRUCT_FORMAT) + 32 + 21*calcsize("n2P"))
# dict with shared keys
check(newstyleclass().__dict__, size('nQ2P') + 5*self.P)
check(newstyleclass().__dict__, size('nQ2P') + 15*self.P)
o = newstyleclass()
o.a = o.b = o.c = o.d = o.e = o.f = o.g = o.h = 1
# Separate block for PyDictKeysObject with 16 keys and 10 entries
check(newstyleclass, s + calcsize(DICT_KEY_STRUCT_FORMAT) + 16 + 10*calcsize("n2P"))
check(newstyleclass, s + calcsize(DICT_KEY_STRUCT_FORMAT) + 32 + 21*calcsize("n2P"))
# dict with shared keys
check(newstyleclass().__dict__, size('nQ2P') + 10*self.P)
check(newstyleclass().__dict__, size('nQ2P') + 13*self.P)
# unicode
# each tuple contains a string and its expected character size
# don't put any static strings here, as they may contain