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pycore_dict.h
#ifndef Py_INTERNAL_DICT_H #define Py_INTERNAL_DICT_H #ifdef __cplusplus extern "C" { #endif #ifndef Py_BUILD_CORE # error "this header requires Py_BUILD_CORE define" #endif #include "pycore_dict_state.h" #include "pycore_runtime.h" // _PyRuntime /* runtime lifecycle */ extern void _PyDict_Fini(PyInterpreterState *interp); /* other API */ 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; typedef struct { PyObject *me_key; /* The key must be Unicode and have hash. */ PyObject *me_value; /* This field is only meaningful for combined tables */ } PyDictUnicodeEntry; extern PyDictKeysObject *_PyDict_NewKeysForClass(void); extern PyObject *_PyDict_FromKeys(PyObject *, PyObject *, PyObject *); /* Gets a version number unique to the current state of the keys of dict, if possible. * Returns the version number, or zero if it was not possible to get a version number. */ extern uint32_t _PyDictKeys_GetVersionForCurrentState( PyInterpreterState *interp, PyDictKeysObject *dictkeys); extern size_t _PyDict_KeysSize(PyDictKeysObject *keys); /* _Py_dict_lookup() returns index of entry which can be used like DK_ENTRIES(dk)[index]. * -1 when no entry found, -3 when compare raises error. */ extern Py_ssize_t _Py_dict_lookup(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr); extern Py_ssize_t _PyDict_LookupIndex(PyDictObject *, PyObject *); extern Py_ssize_t _PyDictKeys_StringLookup(PyDictKeysObject* dictkeys, PyObject *key); extern PyObject *_PyDict_LoadGlobal(PyDictObject *, PyDictObject *, PyObject *); /* Consumes references to key and value */ extern int _PyDict_SetItem_Take2(PyDictObject *op, PyObject *key, PyObject *value); extern int _PyObjectDict_SetItem(PyTypeObject *tp, PyObject **dictptr, PyObject *name, PyObject *value); extern PyObject *_PyDict_Pop_KnownHash(PyObject *, PyObject *, Py_hash_t, PyObject *); #define DKIX_EMPTY (-1) #define DKIX_DUMMY (-2) /* Used internally */ #define DKIX_ERROR (-3) #define DKIX_KEY_CHANGED (-4) /* Used internally */ typedef enum { DICT_KEYS_GENERAL = 0, DICT_KEYS_UNICODE = 1, DICT_KEYS_SPLIT = 2 } DictKeysKind; /* 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. */ uint8_t dk_log2_size; /* Size of the hash table (dk_indices) by bytes. */ uint8_t dk_log2_index_bytes; /* Kind of keys */ uint8_t dk_kind; /* Version number -- Reset to 0 by any modification to keys */ uint32_t dk_version; /* 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, SIZEOF_VOID_P is minimum. */ char dk_indices[]; /* char is required to avoid strict aliasing. */ /* "PyDictKeyEntry or PyDictUnicodeEntry dk_entries[USABLE_FRACTION(DK_SIZE(dk))];" array follows: see the DK_ENTRIES() macro */ }; /* This must be no more than 250, for the prefix size to fit in one byte. */ #define SHARED_KEYS_MAX_SIZE 30 #define NEXT_LOG2_SHARED_KEYS_MAX_SIZE 6 /* Layout of dict values: * * The PyObject *values are preceded by an array of bytes holding * the insertion order and size. * [-1] = prefix size. [-2] = used size. size[-2-n...] = insertion order. */ struct _dictvalues { PyObject *values[1]; }; #define DK_LOG_SIZE(dk) _Py_RVALUE((dk)->dk_log2_size) #if SIZEOF_VOID_P > 4 #define DK_SIZE(dk) (((int64_t)1)<<DK_LOG_SIZE(dk)) #else #define DK_SIZE(dk) (1<<DK_LOG_SIZE(dk)) #endif static inline void* _DK_ENTRIES(PyDictKeysObject *dk) { int8_t *indices = (int8_t*)(dk->dk_indices); size_t index = (size_t)1 << dk->dk_log2_index_bytes; return (&indices[index]); } static inline PyDictKeyEntry* DK_ENTRIES(PyDictKeysObject *dk) { assert(dk->dk_kind == DICT_KEYS_GENERAL); return (PyDictKeyEntry*)_DK_ENTRIES(dk); } static inline PyDictUnicodeEntry* DK_UNICODE_ENTRIES(PyDictKeysObject *dk) { assert(dk->dk_kind != DICT_KEYS_GENERAL); return (PyDictUnicodeEntry*)_DK_ENTRIES(dk); } #define DK_IS_UNICODE(dk) ((dk)->dk_kind != DICT_KEYS_GENERAL) #define DICT_VERSION_INCREMENT (1 << DICT_MAX_WATCHERS) #define DICT_VERSION_MASK (DICT_VERSION_INCREMENT - 1) #define DICT_NEXT_VERSION(INTERP) \ ((INTERP)->dict_state.global_version += DICT_VERSION_INCREMENT) void _PyDict_SendEvent(int watcher_bits, PyDict_WatchEvent event, PyDictObject *mp, PyObject *key, PyObject *value); static inline uint64_t _PyDict_NotifyEvent(PyInterpreterState *interp, PyDict_WatchEvent event, PyDictObject *mp, PyObject *key, PyObject *value) { assert(Py_REFCNT((PyObject*)mp) > 0); int watcher_bits = mp->ma_version_tag & DICT_VERSION_MASK; if (watcher_bits) { _PyDict_SendEvent(watcher_bits, event, mp, key, value); return DICT_NEXT_VERSION(interp) | watcher_bits; } return DICT_NEXT_VERSION(interp); } extern PyObject *_PyObject_MakeDictFromInstanceAttributes(PyObject *obj, PyDictValues *values); extern PyObject *_PyDict_FromItems( PyObject *const *keys, Py_ssize_t keys_offset, PyObject *const *values, Py_ssize_t values_offset, Py_ssize_t length); static inline void _PyDictValues_AddToInsertionOrder(PyDictValues *values, Py_ssize_t ix) { assert(ix < SHARED_KEYS_MAX_SIZE); uint8_t *size_ptr = ((uint8_t *)values)-2; int size = *size_ptr; assert(size+2 < ((uint8_t *)values)[-1]); size++; size_ptr[-size] = (uint8_t)ix; *size_ptr = size; } #ifdef __cplusplus } #endif #endif /* !Py_INTERNAL_DICT_H */
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