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156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
110 lines
3.6 KiB
C++
Vendored
110 lines
3.6 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___NEW_ALLOCATE_H
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#define _LIBCPP___NEW_ALLOCATE_H
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#include <__config>
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#include <__cstddef/max_align_t.h>
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#include <__cstddef/size_t.h>
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#include <__new/align_val_t.h>
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#include <__new/global_new_delete.h> // for _LIBCPP_HAS_SIZED_DEALLOCATION
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#include <__type_traits/type_identity.h>
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#include <__utility/element_count.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_CONSTEXPR inline _LIBCPP_HIDE_FROM_ABI bool __is_overaligned_for_new(size_t __align) _NOEXCEPT {
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#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
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return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__;
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#else
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return __align > _LIBCPP_ALIGNOF(max_align_t);
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#endif
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}
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI void* __libcpp_operator_new(_Args... __args) {
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#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete)
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return __builtin_operator_new(__args...);
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#else
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return ::operator new(__args...);
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#endif
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}
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI void __libcpp_operator_delete(_Args... __args) _NOEXCEPT {
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#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete)
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__builtin_operator_delete(__args...);
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#else
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::operator delete(__args...);
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#endif
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}
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI _Tp*
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__libcpp_allocate(__element_count __n, size_t __align = _LIBCPP_ALIGNOF(_Tp)) {
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size_t __size = static_cast<size_t>(__n) * sizeof(_Tp);
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#if _LIBCPP_HAS_ALIGNED_ALLOCATION
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if (__is_overaligned_for_new(__align)) {
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const align_val_t __align_val = static_cast<align_val_t>(__align);
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return static_cast<_Tp*>(std::__libcpp_operator_new(__size, __align_val));
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}
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#endif
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(void)__align;
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return static_cast<_Tp*>(std::__libcpp_operator_new(__size));
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}
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#if _LIBCPP_HAS_SIZED_DEALLOCATION
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# define _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(...) __VA_ARGS__
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#else
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# define _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(...) /* nothing */
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#endif
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate(
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__type_identity_t<_Tp>* __ptr, __element_count __n, size_t __align = _LIBCPP_ALIGNOF(_Tp)) _NOEXCEPT {
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size_t __size = static_cast<size_t>(__n) * sizeof(_Tp);
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(void)__size;
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#if !_LIBCPP_HAS_ALIGNED_ALLOCATION
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(void)__align;
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return std::__libcpp_operator_delete(__ptr _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(, __size));
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#else
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if (__is_overaligned_for_new(__align)) {
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const align_val_t __align_val = static_cast<align_val_t>(__align);
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return std::__libcpp_operator_delete(__ptr _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(, __size), __align_val);
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} else {
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return std::__libcpp_operator_delete(__ptr _LIBCPP_ONLY_IF_SIZED_DEALLOCATION(, __size));
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}
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#endif
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}
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#undef _LIBCPP_ONLY_IF_SIZED_DEALLOCATION
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI void
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__libcpp_deallocate_unsized(__type_identity_t<_Tp>* __ptr, size_t __align = _LIBCPP_ALIGNOF(_Tp)) _NOEXCEPT {
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#if !_LIBCPP_HAS_ALIGNED_ALLOCATION
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(void)__align;
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return std::__libcpp_operator_delete(__ptr);
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#else
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if (__is_overaligned_for_new(__align)) {
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const align_val_t __align_val = static_cast<align_val_t>(__align);
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return std::__libcpp_operator_delete(__ptr, __align_val);
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} else {
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return std::__libcpp_operator_delete(__ptr);
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}
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#endif
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___NEW_ALLOCATE_H
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