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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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PC/python3dll.c
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@ -28,7 +28,6 @@ EXPORT_FUNC(_PyArg_VaParseTupleAndKeywords_SizeT)
EXPORT_FUNC(_PyErr_BadInternalCall)
EXPORT_FUNC(_PyObject_CallFunction_SizeT)
EXPORT_FUNC(_PyObject_CallMethod_SizeT)
EXPORT_FUNC(_PyObject_GC_Malloc)
EXPORT_FUNC(_PyObject_GC_New)
EXPORT_FUNC(_PyObject_GC_NewVar)
EXPORT_FUNC(_PyObject_GC_Resize)