1634c15e3c
We need to use the vcruntime declarations on Windows to avoid an ODR violation involving rtti.obj, which provides the definition of the runtime function implementing dynamic_cast and depends on the vcruntime implementations of bad_cast and bad_typeid. Differential Revision: https://reviews.llvm.org/D42220 llvm-svn: 323491
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
//===------------------------- typeinfo.cpp -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "typeinfo"
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#if defined(_LIBCPP_ABI_MICROSOFT) && defined(_LIBCPP_NO_VCRUNTIME)
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#include <string.h>
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int std::type_info::__compare(const type_info &__rhs) const _NOEXCEPT {
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if (&__data == &__rhs.__data)
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return 0;
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return strcmp(&__data.__decorated_name[1], &__rhs.__data.__decorated_name[1]);
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}
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const char *std::type_info::name() const _NOEXCEPT {
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// TODO(compnerd) cache demangled &__data.__decorated_name[1]
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return &__data.__decorated_name[1];
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}
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size_t std::type_info::hash_code() const _NOEXCEPT {
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#if defined(_WIN64)
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constexpr size_t fnv_offset_basis = 14695981039346656037ull;
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constexpr size_t fnv_prime = 10995116282110ull;
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#else
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constexpr size_t fnv_offset_basis = 2166136261ull;
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constexpr size_t fnv_prime = 16777619ull;
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#endif
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size_t value = fnv_offset_basis;
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for (const char* c = &__data.__decorated_name[1]; *c; ++c) {
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value ^= static_cast<size_t>(static_cast<unsigned char>(*c));
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value *= fnv_prime;
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}
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#if defined(_WIN64)
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value ^= value >> 32;
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#endif
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return value;
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}
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#endif // _LIBCPP_ABI_MICROSOFT
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// FIXME: Remove __APPLE__ default here once buildit is gone.
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// FIXME: Remove the _LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY configuration.
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#if (!defined(LIBCXX_BUILDING_LIBCXXABI) && !defined(LIBCXXRT) && \
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!defined(__GLIBCXX__) && !defined(__APPLE__) && \
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!(defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME))) || \
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defined(_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY)
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std::type_info::~type_info()
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{
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}
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#endif
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