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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
#ifndef Py_DICT_COMMON_H
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#define Py_DICT_COMMON_H
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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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/* dict_lookup_func() 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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typedef Py_ssize_t (*dict_lookup_func)
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(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject ***value_addr,
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Py_ssize_t *hashpos);
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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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/* 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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Py_ssize_t dk_size;
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/* Function to lookup in the hash table (dk_indices):
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- lookdict(): general-purpose, and may return DKIX_ERROR if (and
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only if) a comparison raises an exception.
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- lookdict_unicode(): specialized to Unicode string keys, comparison of
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which can never raise an exception; that function can never return
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DKIX_ERROR.
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- lookdict_unicode_nodummy(): similar to lookdict_unicode() but further
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specialized for Unicode string keys that cannot be the <dummy> value.
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- lookdict_split(): Version of lookdict() for split tables. */
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dict_lookup_func dk_lookup;
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/* Number of usable entries in dk_entries.
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0 <= dk_usable <= USABLE_FRACTION(dk_size) */
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Py_ssize_t dk_usable;
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/* Number of used entries in dk_entries.
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0 <= dk_nentries < dk_size */
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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, 8 is minimum. */
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union {
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int8_t as_1[8];
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int16_t as_2[4];
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int32_t as_4[2];
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#if SIZEOF_VOID_P > 4
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int64_t as_8[1];
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#endif
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} dk_indices;
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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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#endif
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