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1// -*- C++ -*-
2//===----------------------------- new ------------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_NEW
12#define _LIBCPP_NEW
13
14/*
15    new synopsis
16
17namespace std
18{
19
20class bad_alloc
21    : public exception
22{
23public:
24    bad_alloc() noexcept;
25    bad_alloc(const bad_alloc&) noexcept;
26    bad_alloc& operator=(const bad_alloc&) noexcept;
27    virtual const char* what() const noexcept;
28};
29
30class bad_array_length : public bad_alloc // FIXME: Not part of C++
31{
32public:
33    bad_array_length() noexcept;
34};
35
36class bad_array_new_length : public bad_alloc // C++14
37{
38public:
39    bad_array_new_length() noexcept;
40};
41
42enum class align_val_t : size_t {}; // C++17
43struct nothrow_t {};
44extern const nothrow_t nothrow;
45typedef void (*new_handler)();
46new_handler set_new_handler(new_handler new_p) noexcept;
47new_handler get_new_handler() noexcept;
48
49// 21.6.4, pointer optimization barrier
50template <class T> constexpr T* launder(T* p) noexcept; // C++17
51}  // std
52
53void* operator new(std::size_t size);                                   // replaceable, nodiscard in C++2a
54void* operator new(std::size_t size, std::align_val_t alignment);       // replaceable, C++17, nodiscard in C++2a
55void* operator new(std::size_t size, const std::nothrow_t&) noexcept;   // replaceable, nodiscard in C++2a
56void* operator new(std::size_t size, std::align_val_t alignment,
57                   const std::nothrow_t&) noexcept;                     // replaceable, C++17, nodiscard in C++2a
58void  operator delete(void* ptr) noexcept;                              // replaceable
59void  operator delete(void* ptr, std::size_t size) noexcept;            // replaceable, C++14
60void  operator delete(void* ptr, std::align_val_t alignment) noexcept;  // replaceable, C++17
61void  operator delete(void* ptr, std::size_t size,
62                      std::align_val_t alignment) noexcept;             // replaceable, C++17
63void  operator delete(void* ptr, const std::nothrow_t&) noexcept;       // replaceable
64void  operator delete(void* ptr, std:align_val_t alignment,
65                      const std::nothrow_t&) noexcept;                  // replaceable, C++17
66
67void* operator new[](std::size_t size);                                 // replaceable, nodiscard in C++2a
68void* operator new[](std::size_t size,
69                     std::align_val_t alignment) noexcept;              // replaceable, C++17, nodiscard in C++2a
70void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a
71void* operator new[](std::size_t size, std::align_val_t alignment,
72                     const std::nothrow_t&) noexcept;                   // replaceable, C++17, nodiscard in C++2a
73void  operator delete[](void* ptr) noexcept;                            // replaceable
74void  operator delete[](void* ptr, std::size_t size) noexcept;          // replaceable, C++14
75void  operator delete[](void* ptr,
76                        std::align_val_t alignment) noexcept;           // replaceable, C++17
77void  operator delete[](void* ptr, std::size_t size,
78                        std::align_val_t alignment) noexcept;           // replaceable, C++17
79void  operator delete[](void* ptr, const std::nothrow_t&) noexcept;     // replaceable
80void  operator delete[](void* ptr, std::align_val_t alignment,
81                        const std::nothrow_t&) noexcept;                // replaceable, C++17
82
83void* operator new  (std::size_t size, void* ptr) noexcept;             // nodiscard in C++2a
84void* operator new[](std::size_t size, void* ptr) noexcept;             // nodiscard in C++2a
85void  operator delete  (void* ptr, void*) noexcept;
86void  operator delete[](void* ptr, void*) noexcept;
87
88*/
89
90#include <__config>
91#include <exception>
92#include <cstddef>
93#ifdef _LIBCPP_NO_EXCEPTIONS
94#include <cstdlib>
95#endif
96
97#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
98#include <new.h>
99#endif
100
101#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
102#pragma GCC system_header
103#endif
104
105#if !(defined(_LIBCPP_BUILDING_NEW) || _LIBCPP_STD_VER >= 14 || \
106    (defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309))
107# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION
108#endif
109
110#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) && \
111    (!(defined(_LIBCPP_BUILDING_NEW) || _LIBCPP_STD_VER > 14 || \
112    (defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606)))
113# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
114#endif
115
116namespace std  // purposefully not using versioning namespace
117{
118
119#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
120struct _LIBCPP_TYPE_VIS nothrow_t {};
121extern _LIBCPP_FUNC_VIS const nothrow_t nothrow;
122
123class _LIBCPP_EXCEPTION_ABI bad_alloc
124    : public exception
125{
126public:
127    bad_alloc() _NOEXCEPT;
128    virtual ~bad_alloc() _NOEXCEPT;
129    virtual const char* what() const _NOEXCEPT;
130};
131
132class _LIBCPP_EXCEPTION_ABI bad_array_new_length
133    : public bad_alloc
134{
135public:
136    bad_array_new_length() _NOEXCEPT;
137    virtual ~bad_array_new_length() _NOEXCEPT;
138    virtual const char* what() const _NOEXCEPT;
139};
140
141typedef void (*new_handler)();
142_LIBCPP_FUNC_VIS new_handler set_new_handler(new_handler) _NOEXCEPT;
143_LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT;
144
145#endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME
146
147_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_bad_alloc();  // not in C++ spec
148
149#if defined(_LIBCPP_BUILDING_LIBRARY) || (_LIBCPP_STD_VER > 11)
150
151class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_ARRAY_LENGTH
152    bad_array_length : public bad_alloc {
153public:
154    bad_array_length() _NOEXCEPT;
155    virtual ~bad_array_length() _NOEXCEPT;
156    virtual const char* what() const _NOEXCEPT;
157};
158
159#define _LIBCPP_BAD_ARRAY_LENGTH_DEFINED
160
161#endif  // defined(_LIBCPP_BUILDING_NEW) || (_LIBCPP_STD_VER > 11)
162
163#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) || _LIBCPP_STD_VER > 14
164#ifndef _LIBCPP_CXX03_LANG
165enum class _LIBCPP_ENUM_VIS align_val_t : size_t { };
166#else
167enum align_val_t { __zero = 0, __max = (size_t)-1 };
168#endif
169#endif
170
171}  // std
172
173#if defined(_LIBCPP_CXX03_LANG)
174#define _THROW_BAD_ALLOC throw(std::bad_alloc)
175#else
176#define _THROW_BAD_ALLOC
177#endif
178
179#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
180
181_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC;
182_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
183_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete(void* __p) _NOEXCEPT;
184_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;
185#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
186_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void  operator delete(void* __p, std::size_t __sz) _NOEXCEPT;
187#endif
188
189_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC;
190_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
191_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete[](void* __p) _NOEXCEPT;
192_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;
193#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
194_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void  operator delete[](void* __p, std::size_t __sz) _NOEXCEPT;
195#endif
196
197#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
198_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
199_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
200_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete(void* __p, std::align_val_t) _NOEXCEPT;
201_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
202#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
203_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void  operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
204#endif
205
206_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
207_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
208_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete[](void* __p, std::align_val_t) _NOEXCEPT;
209_LIBCPP_OVERRIDABLE_FUNC_VIS void  operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
210#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
211_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void  operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
212#endif
213#endif
214
215_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new  (std::size_t, void* __p) _NOEXCEPT {return __p;}
216_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;}
217inline _LIBCPP_INLINE_VISIBILITY void  operator delete  (void*, void*) _NOEXCEPT {}
218inline _LIBCPP_INLINE_VISIBILITY void  operator delete[](void*, void*) _NOEXCEPT {}
219
220#endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME
221
222_LIBCPP_BEGIN_NAMESPACE_STD
223
224inline _LIBCPP_INLINE_VISIBILITY void *__allocate(size_t __size) {
225#ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE
226  return ::operator new(__size);
227#else
228  return __builtin_operator_new(__size);
229#endif
230}
231
232inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate(void *__ptr) {
233#ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE
234  ::operator delete(__ptr);
235#else
236  __builtin_operator_delete(__ptr);
237#endif
238}
239
240#ifdef _LIBCPP_BAD_ARRAY_LENGTH_DEFINED
241_LIBCPP_NORETURN inline _LIBCPP_ALWAYS_INLINE
242#ifndef _LIBCPP_NO_EXCEPTIONS
243_LIBCPP_AVAILABILITY_BAD_ARRAY_LENGTH
244#endif
245void __throw_bad_array_length()
246{
247#ifndef _LIBCPP_NO_EXCEPTIONS
248    throw bad_array_length();
249#else
250	_VSTD::abort();
251#endif
252}
253#endif
254
255template <class _Tp>
256_LIBCPP_NODISCARD_AFTER_CXX17 inline
257_LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT
258{
259    static_assert (!(is_function<_Tp>::value), "can't launder functions" );
260    static_assert (!(is_same<void, typename remove_cv<_Tp>::type>::value), "can't launder cv-void" );
261#ifdef _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER
262    return __builtin_launder(__p);
263#else
264    return __p;
265#endif
266}
267
268
269#if _LIBCPP_STD_VER > 14
270template <class _Tp>
271_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY
272constexpr _Tp* launder(_Tp* __p) noexcept
273{
274    return _VSTD::__launder(__p);
275}
276#endif
277
278_LIBCPP_END_NAMESPACE_STD
279
280#endif  // _LIBCPP_NEW
281