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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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1
Include/cpython/object.h
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@ -270,7 +270,6 @@ struct _typeobject {
destructor tp_finalize;
vectorcallfunc tp_vectorcall;
Py_ssize_t tp_inline_values_offset;
};
/* The *real* layout of a type object when allocated on the heap */

3
Include/cpython/objimpl.h
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@ -90,9 +90,6 @@ PyAPI_FUNC(int) PyObject_IS_GC(PyObject *obj);
# define _PyGC_FINALIZED(o) PyObject_GC_IsFinalized(o)
#endif
PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t size);
PyAPI_FUNC(PyObject *) _PyObject_GC_Calloc(size_t size);
/* Test if a type supports weak references */
#define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0)