55 lines · cpp
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-exception6//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# else31 constexpr size_t fnv_offset_basis = 2166136261ull;32 constexpr size_t fnv_prime = 16777619ull;33# endif34 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# endif44 45 return value;46}47#endif // _LIBCPP_ABI_MICROSOFT48 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#endif55