blob: b4443a678b7e771052fb61e91a2faf90f04ae743 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
#ifndef Py_CPYTHON_SETOBJECT_H
# error "this header file must not be included directly"
#endif
/* There are three kinds of entries in the table:
1. Unused: key == NULL and hash == 0
2. Dummy: key == dummy and hash == -1
3. Active: key != NULL and key != dummy and hash != -1
The hash field of Unused slots is always zero.
The hash field of Dummy slots are set to -1
meaning that dummy entries can be detected by
either entry->key==dummy or by entry->hash==-1.
*/
#define PySet_MINSIZE 8
typedef struct {
PyObject *key;
Py_hash_t hash; /* Cached hash code of the key */
} setentry;
/* The SetObject data structure is shared by set and frozenset objects.
Invariant for sets:
- hash is -1
Invariants for frozensets:
- data is immutable.
- hash is the hash of the frozenset or -1 if not computed yet.
*/
typedef struct {
PyObject_HEAD
Py_ssize_t fill; /* Number active and dummy entries*/
Py_ssize_t used; /* Number active entries */
/* The table contains mask + 1 slots, and that's a power of 2.
* We store the mask instead of the size because the mask is more
* frequently needed.
*/
Py_ssize_t mask;
/* The table points to a fixed-size smalltable for small tables
* or to additional malloc'ed memory for bigger tables.
* The table pointer is never NULL which saves us from repeated
* runtime null-tests.
*/
setentry *table;
Py_hash_t hash; /* Only used by frozenset objects */
Py_ssize_t finger; /* Search finger for pop() */
setentry smalltable[PySet_MINSIZE];
PyObject *weakreflist; /* List of weak references */
} PySetObject;
#define PySet_GET_SIZE(so) \
(assert(PyAnySet_Check(so)), (((PySetObject *)(so))->used))
PyAPI_DATA(PyObject *) _PySet_Dummy;
PyAPI_FUNC(int) _PySet_NextEntry(PyObject *set, Py_ssize_t *pos, PyObject **key, Py_hash_t *hash);
PyAPI_FUNC(int) _PySet_Update(PyObject *set, PyObject *iterable);
|
