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Implement compact dict

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Issue #27350: `dict` implementation is changed like PyPy. It is more compact
and preserves insertion order.

_PyDict_Dummy() function has been removed.

Disable test_gdb: python-gdb.py is not updated yet to the new structure of
compact dictionaries (issue #28023).

Patch written by INADA Naoki.
This commit is contained in:
Victor Stinner 2016-09-07 17:40:12 -07:00
parent d8b7770a0e
commit 742da040db
12 changed files with 793 additions and 569 deletions
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16
Objects/dict-common.h
View file

@ -8,15 +8,25 @@ typedef struct {
PyObject *me_value; /* This field is only meaningful for combined tables */
} PyDictKeyEntry;
typedef PyDictKeyEntry *(*dict_lookup_func)
(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject ***value_addr);
/* dict_lookup_func() returns index of entry which can be used like DK_ENTRIES(dk)[index].
* -1 when no entry found, -3 when compare raises error.
*/
typedef Py_ssize_t (*dict_lookup_func)
(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject ***value_addr,
Py_ssize_t *hashpos);
#define DKIX_EMPTY (-1)
#define DKIX_DUMMY (-2) /* Used internally */
#define DKIX_ERROR (-3)
/* See dictobject.c for actual layout of DictKeysObject */
struct _dictkeysobject {
Py_ssize_t dk_refcnt;
Py_ssize_t dk_size;
dict_lookup_func dk_lookup;
Py_ssize_t dk_usable;
PyDictKeyEntry dk_entries[1];
Py_ssize_t dk_nentries; /* How many entries are used. */
char dk_indices[8]; /* dynamically sized. 8 is minimum. */
};
#endif