mirror of https://github.com/python/cpython
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
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#ifndef Py_INTERNAL_DICT_H
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#define Py_INTERNAL_DICT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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# error "this header requires Py_BUILD_CORE define"
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#endif
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typedef struct {
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/* Cached hash code of me_key. */
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Py_hash_t me_hash;
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PyObject *me_key;
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PyObject *me_value; /* This field is only meaningful for combined tables */
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} PyDictKeyEntry;
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/* _Py_dict_lookup() returns index of entry which can be used like DK_ENTRIES(dk)[index].
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* -1 when no entry found, -3 when compare raises error.
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*/
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Py_ssize_t _Py_dict_lookup(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr);
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#define DKIX_EMPTY (-1)
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#define DKIX_DUMMY (-2) /* Used internally */
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#define DKIX_ERROR (-3)
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typedef enum {
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DICT_KEYS_GENERAL = 0,
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DICT_KEYS_UNICODE = 1,
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DICT_KEYS_SPLIT = 2
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} DictKeysKind;
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/* See dictobject.c for actual layout of DictKeysObject */
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struct _dictkeysobject {
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Py_ssize_t dk_refcnt;
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/* Size of the hash table (dk_indices). It must be a power of 2. */
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uint8_t dk_log2_size;
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/* Kind of keys */
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uint8_t dk_kind;
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/* Version number -- Reset to 0 by any modification to keys */
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uint32_t dk_version;
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/* Number of usable entries in dk_entries. */
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Py_ssize_t dk_usable;
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/* Number of used entries in dk_entries. */
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Py_ssize_t dk_nentries;
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/* Actual hash table of dk_size entries. It holds indices in dk_entries,
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or DKIX_EMPTY(-1) or DKIX_DUMMY(-2).
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Indices must be: 0 <= indice < USABLE_FRACTION(dk_size).
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The size in bytes of an indice depends on dk_size:
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- 1 byte if dk_size <= 0xff (char*)
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- 2 bytes if dk_size <= 0xffff (int16_t*)
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- 4 bytes if dk_size <= 0xffffffff (int32_t*)
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- 8 bytes otherwise (int64_t*)
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Dynamically sized, SIZEOF_VOID_P is minimum. */
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char dk_indices[]; /* char is required to avoid strict aliasing. */
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/* "PyDictKeyEntry dk_entries[dk_usable];" array follows:
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see the DK_ENTRIES() macro */
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};
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#define DK_LOG_SIZE(dk) ((dk)->dk_log2_size)
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#if SIZEOF_VOID_P > 4
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#define DK_SIZE(dk) (((int64_t)1)<<DK_LOG_SIZE(dk))
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#define DK_IXSIZE(dk) \
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(DK_LOG_SIZE(dk) <= 7 ? \
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1 : DK_LOG_SIZE(dk) <= 15 ? \
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2 : DK_LOG_SIZE(dk) <= 31 ? \
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4 : sizeof(int64_t))
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#else
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#define DK_SIZE(dk) (1<<DK_LOG_SIZE(dk))
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#define DK_IXSIZE(dk) \
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(DK_LOG_SIZE(dk) <= 7 ? \
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1 : DK_LOG_SIZE(dk) <= 15 ? \
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2 : sizeof(int32_t))
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#endif
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#define DK_ENTRIES(dk) \
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((PyDictKeyEntry*)(&((int8_t*)((dk)->dk_indices))[DK_SIZE(dk) * DK_IXSIZE(dk)]))
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extern uint64_t _pydict_global_version;
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#define DICT_NEXT_VERSION() (++_pydict_global_version)
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_INTERNAL_DICT_H */
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