cnpython/Objects/dict-common.h at cnpython · lp9102/cnpython · GitHub

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#ifndef Py_DICT_COMMON_H

#define Py_DICT_COMMON_H

typedef struct {

/* Cached hash code of me_key. */

Py_hash_t me_hash;

PyObject *me_key;

PyObject *me_value; /* This field is only meaningful for combined tables */

} PyDictKeyEntry;

/* 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);

#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;

/* Size of the hash table (dk_indices). It must be a power of 2. */

Py_ssize_t dk_size;

/* Function to lookup in the hash table (dk_indices):

- lookdict(): general-purpose, and may return DKIX_ERROR if (and

only if) a comparison raises an exception.

- lookdict_unicode(): specialized to Unicode string keys, comparison of

which can never raise an exception; that function can never return

DKIX_ERROR.

- lookdict_unicode_nodummy(): similar to lookdict_unicode() but further

specialized for Unicode string keys that cannot be the <dummy> value.

- lookdict_split(): Version of lookdict() for split tables. */

dict_lookup_func dk_lookup;

/* Number of usable entries in dk_entries. */

Py_ssize_t dk_usable;

/* Number of used entries in dk_entries. */

Py_ssize_t dk_nentries;

/* Actual hash table of dk_size entries. It holds indices in dk_entries,

or DKIX_EMPTY(-1) or DKIX_DUMMY(-2).

Indices must be: 0 <= indice < USABLE_FRACTION(dk_size).

The size in bytes of an indice depends on dk_size:

- 1 byte if dk_size <= 0xff (char*)

- 2 bytes if dk_size <= 0xffff (int16_t*)

- 4 bytes if dk_size <= 0xffffffff (int32_t*)

- 8 bytes otherwise (int64_t*)

Dynamically sized, 8 is minimum. */

union {

int8_t as_1[8];

int16_t as_2[4];

int32_t as_4[2];

#if SIZEOF_VOID_P > 4

int64_t as_8[1];

#endif

} dk_indices;

/* "PyDictKeyEntry dk_entries[dk_usable];" array follows:

see the DK_ENTRIES() macro */

};

#endif

cnpython/Objects/dict-common.h at cnpython · lp9102/cnpython · GitHub

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