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1// Copyright (c) Facebook, Inc. and its affiliates. (http://www.facebook.com)
2#include <cmath>
3
4#include "cpython-data.h"
5#include "cpython-func.h"
6
7#include "float-builtins.h"
8#include "globals.h"
9#include "objects.h"
10#include "runtime.h"
11#include "thread.h"
12
13namespace py {
14
15// Make sure constants are kept in sync between pyro and C-API.
16static_assert(static_cast<word>(_PyHASH_INF) == kHashInf, "constant mismatch");
17static_assert(static_cast<word>(_PyHASH_NAN) == kHashNan, "constant mismatch");
18static_assert(static_cast<word>(_PyHASH_IMAG) == kHashImag,
19 "constant mismatch");
20static_assert(_PyHASH_BITS == kArithmeticHashBits, "constant mismatch");
21static_assert(static_cast<word>(_PyHASH_MODULUS) == kArithmeticHashModulus,
22 "constant mismatch");
23
24PY_EXPORT Py_hash_t _Py_HashDouble(double v) { return doubleHash(v); }
25
26PY_EXPORT Py_hash_t _Py_HashPointer(void* p) {
27 size_t y = bit_cast<size_t>(p);
28 /* bottom 3 or 4 bits are likely to be 0; rotate y by 4 to avoid
29 excessive hash collisions for dicts and sets */
30 y = (y >> 4) | (y << (kBitsPerPointer - 4));
31 Py_hash_t x = (Py_hash_t)y;
32 if (x == -1) x = -2;
33 return x;
34}
35
36PY_EXPORT Py_hash_t _Py_HashBytes(const void* src, Py_ssize_t len) {
37 DCHECK(len >= 0, "invalid len");
38 View<byte> bytes(reinterpret_cast<const byte*>(src), len);
39 if (len <= SmallBytes::kMaxLength) {
40 return SmallBytes::fromBytes(bytes).hash();
41 }
42 return Thread::current()->runtime()->bytesHash(bytes);
43}
44
45PY_EXPORT void _PyHash_Fini(void) {}
46
47PY_EXPORT const _Py_HashSecret_t* _Py_HashSecret_Ptr() {
48 return reinterpret_cast<const _Py_HashSecret_t*>(
49 Thread::current()->runtime()->hashSecret(sizeof(_Py_HashSecret_t)));
50}
51
52} // namespace py