e78f53d1e8
This reverts commit 68c04b0ae6.
This disables the IWYU mapping that caused the failure, since
the headers aren't reachable for now.
This is the first part of the "Freezing C++03 headers" proposal
explained in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58.
This patch mechanically copies the headers as of the LLVM 19.1 release
into a subdirectory of libc++ so that we can start using these headers
when building in C++03 mode. We are going to be backporting important
changes to that copy of the headers until the LLVM 21 release. After the
LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy
of the headers.
This patch only performs a copy of the headers -- these headers are
still unused by the rest of the codebase.
65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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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___MEMORY_ALIGNED_ALLOC_H
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#define _LIBCPP___MEMORY_ALIGNED_ALLOC_H
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#include <__config>
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#include <cstddef>
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#include <cstdlib>
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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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#ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
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// Low-level helpers to call the aligned allocation and deallocation functions
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// on the target platform. This is used to implement libc++'s own memory
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// allocation routines -- if you need to allocate memory inside the library,
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// chances are that you want to use `__libcpp_allocate` instead.
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//
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// Returns the allocated memory, or `nullptr` on failure.
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inline _LIBCPP_HIDE_FROM_ABI void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) {
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# if defined(_LIBCPP_MSVCRT_LIKE)
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return ::_aligned_malloc(__size, __alignment);
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# elif _LIBCPP_STD_VER >= 17 && !defined(_LIBCPP_HAS_NO_C11_ALIGNED_ALLOC)
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// aligned_alloc() requires that __size is a multiple of __alignment,
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// but for C++ [new.delete.general], only states "if the value of an
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// alignment argument passed to any of these functions is not a valid
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// alignment value, the behavior is undefined".
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// To handle calls such as ::operator new(1, std::align_val_t(128)), we
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// round __size up to the next multiple of __alignment.
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size_t __rounded_size = (__size + __alignment - 1) & ~(__alignment - 1);
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// Rounding up could have wrapped around to zero, so we have to add another
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// max() ternary to the actual call site to avoid succeeded in that case.
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return ::aligned_alloc(__alignment, __size > __rounded_size ? __size : __rounded_size);
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# else
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void* __result = nullptr;
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(void)::posix_memalign(&__result, __alignment, __size);
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// If posix_memalign fails, __result is unmodified so we still return `nullptr`.
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return __result;
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# endif
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}
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inline _LIBCPP_HIDE_FROM_ABI void __libcpp_aligned_free(void* __ptr) {
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# if defined(_LIBCPP_MSVCRT_LIKE)
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::_aligned_free(__ptr);
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# else
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::free(__ptr);
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# endif
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}
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#endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_ALIGNED_ALLOC_H
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