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[libc++] Split std::get_temporary_buffer out of <memory>

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Differential Revision: https://reviews.llvm.org/D100216
This commit is contained in:
Louis Dionne 2021-04-09 12:58:00 -04:00
parent 0b439e4cc9
commit 6a1ac88fc1
3 changed files with 85 additions and 52 deletions
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1
libcxx/include/CMakeLists.txt
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@ -18,6 +18,7 @@ set(files
__memory/auto_ptr.h
__memory/base.h
__memory/pointer_traits.h
__memory/temporary_buffer.h
__memory/utilities.h
__mutex_base
__node_handle

83
libcxx/include/__memory/temporary_buffer.h Normal file
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@ -0,0 +1,83 @@
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MEMORY_TEMPORARY_BUFFER_H
#define _LIBCPP___MEMORY_TEMPORARY_BUFFER_H
#include <__config>
#include <cstddef>
#include <new>
#include <utility> // pair
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
_LIBCPP_NODISCARD_EXT _LIBCPP_NO_CFI
pair<_Tp*, ptrdiff_t>
get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT
{
pair<_Tp*, ptrdiff_t> __r(0, 0);
const ptrdiff_t __m = (~ptrdiff_t(0) ^
ptrdiff_t(ptrdiff_t(1) << (sizeof(ptrdiff_t) * __CHAR_BIT__ - 1)))
/ sizeof(_Tp);
if (__n > __m)
__n = __m;
while (__n > 0)
{
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
if (__is_overaligned_for_new(_LIBCPP_ALIGNOF(_Tp)))
{
align_val_t __al =
align_val_t(alignment_of<_Tp>::value);
__r.first = static_cast<_Tp*>(::operator new(
__n * sizeof(_Tp), __al, nothrow));
} else {
__r.first = static_cast<_Tp*>(::operator new(
__n * sizeof(_Tp), nothrow));
}
#else
if (__is_overaligned_for_new(_LIBCPP_ALIGNOF(_Tp)))
{
// Since aligned operator new is unavailable, return an empty
// buffer rather than one with invalid alignment.
return __r;
}
__r.first = static_cast<_Tp*>(::operator new(__n * sizeof(_Tp), nothrow));
#endif
if (__r.first)
{
__r.second = __n;
break;
}
__n /= 2;
}
return __r;
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void return_temporary_buffer(_Tp* __p) _NOEXCEPT
{
_VSTD::__libcpp_deallocate_unsized((void*)__p, _LIBCPP_ALIGNOF(_Tp));
}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___MEMORY_TEMPORARY_BUFFER_H

53
libcxx/include/memory
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@ -684,6 +684,7 @@ void* align(size_t alignment, size_t size, void*& ptr, size_t& space);
#include <__memory/auto_ptr.h>
#include <__memory/base.h>
#include <__memory/pointer_traits.h>
#include <__memory/temporary_buffer.h>
#include <__memory/utilities.h>
#if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
# include <atomic>
@ -838,58 +839,6 @@ public:
#endif
};
template <class _Tp>
_LIBCPP_NODISCARD_EXT _LIBCPP_NO_CFI
pair<_Tp*, ptrdiff_t>
get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT
{
pair<_Tp*, ptrdiff_t> __r(0, 0);
const ptrdiff_t __m = (~ptrdiff_t(0) ^
ptrdiff_t(ptrdiff_t(1) << (sizeof(ptrdiff_t) * __CHAR_BIT__ - 1)))
/ sizeof(_Tp);
if (__n > __m)
__n = __m;
while (__n > 0)
{
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
if (__is_overaligned_for_new(_LIBCPP_ALIGNOF(_Tp)))
{
align_val_t __al =
align_val_t(alignment_of<_Tp>::value);
__r.first = static_cast<_Tp*>(::operator new(
__n * sizeof(_Tp), __al, nothrow));
} else {
__r.first = static_cast<_Tp*>(::operator new(
__n * sizeof(_Tp), nothrow));
}
#else
if (__is_overaligned_for_new(_LIBCPP_ALIGNOF(_Tp)))
{
// Since aligned operator new is unavailable, return an empty
// buffer rather than one with invalid alignment.
return __r;
}
__r.first = static_cast<_Tp*>(::operator new(__n * sizeof(_Tp), nothrow));
#endif
if (__r.first)
{
__r.second = __n;
break;
}
__n /= 2;
}
return __r;
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
void return_temporary_buffer(_Tp* __p) _NOEXCEPT
{
_VSTD::__libcpp_deallocate_unsized((void*)__p, _LIBCPP_ALIGNOF(_Tp));
}
// Tag used to default initialize one or both of the pair's elements.
struct __default_init_tag {};
struct __value_init_tag {};