1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include <typeinfo>
10
11#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_ABI_VCRUNTIME)
12
13# include <string.h>
14
15int std::type_info::__compare(const type_info& __rhs) const noexcept {
16 if (&__data == &__rhs.__data)
17 return 0;
18 return strcmp(&__data.__decorated_name[1], &__rhs.__data.__decorated_name[1]);
19}
20
21const char* std::type_info::name() const noexcept {
22 // TODO(compnerd) cache demangled &__data.__decorated_name[1]
23 return &__data.__decorated_name[1];
24}
25
26size_t std::type_info::hash_code() const noexcept {
27# if defined(_WIN64)
28 constexpr size_t fnv_offset_basis = 14695981039346656037ull;
29 constexpr size_t fnv_prime = 10995116282110ull;
30# else
31 constexpr size_t fnv_offset_basis = 2166136261ull;
32 constexpr size_t fnv_prime = 16777619ull;
33# endif
34
35 size_t value = fnv_offset_basis;
36 for (const char* c = &__data.__decorated_name[1]; *c; ++c) {
37 value ^= static_cast<size_t>(static_cast<unsigned char>(*c));
38 value *= fnv_prime;
39 }
40
41# if defined(_WIN64)
42 value ^= value >> 32;
43# endif
44
45 return value;
46}
47#endif // _LIBCPP_ABI_MICROSOFT
48
49// FIXME: Remove the _LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY configuration.
50#if (!defined(LIBCXX_BUILDING_LIBCXXABI) && !defined(LIBCXXRT) && !defined(__GLIBCXX__) && \
51 !defined(_LIBCPP_ABI_VCRUNTIME)) || \
52 defined(_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY)
53std::type_info::~type_info() {}
54#endif
55

source code of libcxx/src/typeinfo.cpp