File size: 2,805 Bytes
2f705f7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | // -*- 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 _LIBCUDACXX___SSO_ALLOCATOR
#define _LIBCUDACXX___SSO_ALLOCATOR
#include <__config>
#include <type_traits>
#include <new>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
template <class _Tp, size_t _Np> class _LIBCUDACXX_HIDDEN __sso_allocator;
template <size_t _Np>
class _LIBCUDACXX_HIDDEN __sso_allocator<void, _Np>
{
public:
typedef const void* const_pointer;
typedef void value_type;
};
template <class _Tp, size_t _Np>
class _LIBCUDACXX_HIDDEN __sso_allocator
{
typename aligned_storage<sizeof(_Tp) * _Np>::type buf_;
bool __allocated_;
public:
typedef size_t size_type;
typedef _Tp* pointer;
typedef _Tp value_type;
_LIBCUDACXX_INLINE_VISIBILITY __sso_allocator() throw() : __allocated_(false) {}
_LIBCUDACXX_INLINE_VISIBILITY __sso_allocator(const __sso_allocator&) throw() : __allocated_(false) {}
template <class _Up> _LIBCUDACXX_INLINE_VISIBILITY __sso_allocator(const __sso_allocator<_Up, _Np>&) throw()
: __allocated_(false) {}
private:
__sso_allocator& operator=(const __sso_allocator&);
public:
_LIBCUDACXX_INLINE_VISIBILITY pointer allocate(size_type __n, typename __sso_allocator<void, _Np>::const_pointer = 0)
{
if (!__allocated_ && __n <= _Np)
{
__allocated_ = true;
return (pointer)&buf_;
}
return static_cast<pointer>(_CUDA_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCUDACXX_ALIGNOF(_Tp)));
}
_LIBCUDACXX_INLINE_VISIBILITY void deallocate(pointer __p, size_type __n)
{
if (__p == (pointer)&buf_)
__allocated_ = false;
else
_CUDA_VSTD::__libcpp_deallocate(__p, __n * sizeof(_Tp), _LIBCUDACXX_ALIGNOF(_Tp));
}
_LIBCUDACXX_INLINE_VISIBILITY size_type max_size() const throw() {return size_type(~0) / sizeof(_Tp);}
_LIBCUDACXX_INLINE_VISIBILITY
bool operator==(__sso_allocator& __a) const {return &buf_ == &__a.buf_;}
_LIBCUDACXX_INLINE_VISIBILITY
bool operator!=(__sso_allocator& __a) const {return &buf_ != &__a.buf_;}
};
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___SSO_ALLOCATOR
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