250 lines
8.8 KiB
C++
250 lines
8.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_ALLOCATOR_H
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#define _LIBCPP___MEMORY_ALLOCATOR_H
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#include <__config>
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#include <__memory/allocator_traits.h>
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#include <__utility/forward.h>
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#include <cstddef>
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#include <new>
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#include <stdexcept>
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#include <type_traits>
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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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template <class _Tp> class allocator;
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#if _LIBCPP_STD_VER <= 17
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template <>
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class _LIBCPP_TEMPLATE_VIS allocator<void>
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{
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public:
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_LIBCPP_DEPRECATED_IN_CXX17 typedef void* pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const void* const_pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef void value_type;
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template <class _Up> struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {typedef allocator<_Up> other;};
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};
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template <>
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class _LIBCPP_TEMPLATE_VIS allocator<const void>
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{
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public:
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const void* pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const void* const_pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const void value_type;
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template <class _Up> struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {typedef allocator<_Up> other;};
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};
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#endif
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// This class provides a non-trivial default constructor to the class that derives from it
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// if the condition is satisfied.
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//
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// The second template parameter exists to allow giving a unique type to __non_trivial_if,
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// which makes it possible to avoid breaking the ABI when making this a base class of an
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// existing class. Without that, imagine we have classes D1 and D2, both of which used to
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// have no base classes, but which now derive from __non_trivial_if. The layout of a class
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// that inherits from both D1 and D2 will change because the two __non_trivial_if base
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// classes are not allowed to share the same address.
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//
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// By making those __non_trivial_if base classes unique, we work around this problem and
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// it is safe to start deriving from __non_trivial_if in existing classes.
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template <bool _Cond, class _Unique>
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struct __non_trivial_if { };
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template <class _Unique>
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struct __non_trivial_if<true, _Unique> {
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR __non_trivial_if() _NOEXCEPT { }
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};
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// allocator
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//
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// Note: For ABI compatibility between C++20 and previous standards, we make
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// allocator<void> trivial in C++20.
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template <class _Tp>
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class _LIBCPP_TEMPLATE_VIS allocator
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: private __non_trivial_if<!is_void<_Tp>::value, allocator<_Tp> >
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{
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static_assert(!is_volatile<_Tp>::value, "std::allocator does not support volatile types");
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef _Tp value_type;
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typedef true_type propagate_on_container_move_assignment;
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typedef true_type is_always_equal;
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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allocator() _NOEXCEPT = default;
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template <class _Up>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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allocator(const allocator<_Up>&) _NOEXCEPT { }
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_Tp* allocate(size_t __n) {
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if (__n > allocator_traits<allocator>::max_size(*this))
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__throw_bad_array_new_length();
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if (__libcpp_is_constant_evaluated()) {
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return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
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} else {
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return static_cast<_Tp*>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
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}
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}
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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void deallocate(_Tp* __p, size_t __n) _NOEXCEPT {
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if (__libcpp_is_constant_evaluated()) {
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::operator delete(__p);
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} else {
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_VSTD::__libcpp_deallocate((void*)__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
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}
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}
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// C++20 Removed members
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#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp* pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* const_pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp& reference;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& const_reference;
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template <class _Up>
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struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {
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typedef allocator<_Up> other;
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};
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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pointer address(reference __x) const _NOEXCEPT {
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return _VSTD::addressof(__x);
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}
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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const_pointer address(const_reference __x) const _NOEXCEPT {
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return _VSTD::addressof(__x);
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}
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_IN_CXX17
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_Tp* allocate(size_t __n, const void*) {
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return allocate(__n);
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}
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT {
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return size_type(~0) / sizeof(_Tp);
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}
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template <class _Up, class... _Args>
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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void construct(_Up* __p, _Args&&... __args) {
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::new ((void*)__p) _Up(_VSTD::forward<_Args>(__args)...);
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}
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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void destroy(pointer __p) {
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__p->~_Tp();
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}
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#endif
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};
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template <class _Tp>
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class _LIBCPP_TEMPLATE_VIS allocator<const _Tp>
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: private __non_trivial_if<!is_void<_Tp>::value, allocator<const _Tp> >
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{
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static_assert(!is_volatile<_Tp>::value, "std::allocator does not support volatile types");
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef const _Tp value_type;
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typedef true_type propagate_on_container_move_assignment;
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typedef true_type is_always_equal;
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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allocator() _NOEXCEPT = default;
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template <class _Up>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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allocator(const allocator<_Up>&) _NOEXCEPT { }
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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const _Tp* allocate(size_t __n) {
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if (__n > allocator_traits<allocator>::max_size(*this))
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__throw_bad_array_new_length();
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if (__libcpp_is_constant_evaluated()) {
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return static_cast<const _Tp*>(::operator new(__n * sizeof(_Tp)));
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} else {
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return static_cast<const _Tp*>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
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}
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}
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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void deallocate(const _Tp* __p, size_t __n) {
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if (__libcpp_is_constant_evaluated()) {
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::operator delete(const_cast<_Tp*>(__p));
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} else {
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_VSTD::__libcpp_deallocate((void*) const_cast<_Tp *>(__p), __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
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}
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}
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// C++20 Removed members
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#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* const_pointer;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& reference;
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_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& const_reference;
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template <class _Up>
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struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {
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typedef allocator<_Up> other;
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};
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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const_pointer address(const_reference __x) const _NOEXCEPT {
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return _VSTD::addressof(__x);
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}
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_IN_CXX17
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const _Tp* allocate(size_t __n, const void*) {
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return allocate(__n);
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}
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT {
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return size_type(~0) / sizeof(_Tp);
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}
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template <class _Up, class... _Args>
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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void construct(_Up* __p, _Args&&... __args) {
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::new ((void*)__p) _Up(_VSTD::forward<_Args>(__args)...);
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}
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_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
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void destroy(pointer __p) {
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__p->~_Tp();
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}
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#endif
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};
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template <class _Tp, class _Up>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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bool operator==(const allocator<_Tp>&, const allocator<_Up>&) _NOEXCEPT {return true;}
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template <class _Tp, class _Up>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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bool operator!=(const allocator<_Tp>&, const allocator<_Up>&) _NOEXCEPT {return false;}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_ALLOCATOR_H
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