1 #ifndef Py_CPYTHON_HASH_H 2 # error "this header file must not be included directly" 3 #endif 4 5 /* Prime multiplier used in string and various other hashes. */ 6 #define PyHASH_MULTIPLIER 1000003UL /* 0xf4243 */ 7 8 /* Parameters used for the numeric hash implementation. See notes for 9 _Py_HashDouble in Python/pyhash.c. Numeric hashes are based on 10 reduction modulo the prime 2**_PyHASH_BITS - 1. */ 11 12 #if SIZEOF_VOID_P >= 8 13 # define PyHASH_BITS 61 14 #else 15 # define PyHASH_BITS 31 16 #endif 17 18 #define PyHASH_MODULUS (((size_t)1 << _PyHASH_BITS) - 1) 19 #define PyHASH_INF 314159 20 #define PyHASH_IMAG PyHASH_MULTIPLIER 21 22 /* Aliases kept for backward compatibility with Python 3.12 */ 23 #define _PyHASH_MULTIPLIER PyHASH_MULTIPLIER 24 #define _PyHASH_BITS PyHASH_BITS 25 #define _PyHASH_MODULUS PyHASH_MODULUS 26 #define _PyHASH_INF PyHASH_INF 27 #define _PyHASH_IMAG PyHASH_IMAG 28 29 /* Helpers for hash functions */ 30 PyAPI_FUNC(Py_hash_t) _Py_HashDouble(PyObject *, double); 31 32 // Kept for backward compatibility 33 #define _Py_HashPointer Py_HashPointer 34 35 36 /* hash function definition */ 37 typedef struct { 38 Py_hash_t (*const hash)(const void *, Py_ssize_t); 39 const char *name; 40 const int hash_bits; 41 const int seed_bits; 42 } PyHash_FuncDef; 43 44 PyAPI_FUNC(PyHash_FuncDef*) PyHash_GetFuncDef(void); 45 46 PyAPI_FUNC(Py_hash_t) Py_HashPointer(const void *ptr); 47 PyAPI_FUNC(Py_hash_t) PyObject_GenericHash(PyObject *); 48