diff options
| author | Mark Shannon <mark@hotpy.org> | 2021-12-07 16:02:53 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-12-07 16:02:53 (GMT) |
| commit | 8319114feedd2a5b77378bba24eb9fb2689c5033 (patch) | |
| tree | b96bfa2c7b8d36124b713170f421f653360a4b5c /Include/object.h | |
| parent | c7e7a4b969b5728d4b4f3c59bf98e1e830d5c6d6 (diff) | |
| download | cpython-8319114feedd2a5b77378bba24eb9fb2689c5033.zip cpython-8319114feedd2a5b77378bba24eb9fb2689c5033.tar.gz cpython-8319114feedd2a5b77378bba24eb9fb2689c5033.tar.bz2 | |
bpo-45947: Place dict and values pointer at fixed (negative) offset just before GC header. (GH-29879)
* 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.
Diffstat (limited to 'Include/object.h')
| -rw-r--r-- | Include/object.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Include/object.h b/Include/object.h index 33df303..e5544e8 100644 --- a/Include/object.h +++ b/Include/object.h @@ -334,6 +334,12 @@ given type object has a specified feature. #ifndef Py_LIMITED_API +/* Placement of dict (and values) pointers are managed by the VM, not by the type. + * The VM will automatically set tp_dictoffset. Should not be used for variable sized + * classes, such as classes that extend tuple. + */ +#define Py_TPFLAGS_MANAGED_DICT (1 << 4) + /* Set if instances of the type object are treated as sequences for pattern matching */ #define Py_TPFLAGS_SEQUENCE (1 << 5) /* Set if instances of the type object are treated as mappings for pattern matching */ |