| // -*- C++ -*- |
| //===----------------------------- new ------------------------------------===// |
| // |
| // 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_NEW |
| #define _LIBCPP_NEW |
| |
| /* |
| new synopsis |
| |
| namespace std |
| { |
| |
| class bad_alloc |
| : public exception |
| { |
| public: |
| bad_alloc() noexcept; |
| bad_alloc(const bad_alloc&) noexcept; |
| bad_alloc& operator=(const bad_alloc&) noexcept; |
| virtual const char* what() const noexcept; |
| }; |
| |
| class bad_array_new_length : public bad_alloc // C++14 |
| { |
| public: |
| bad_array_new_length() noexcept; |
| }; |
| |
| enum class align_val_t : size_t {}; // C++17 |
| |
| struct destroying_delete_t { // C++20 |
| explicit destroying_delete_t() = default; |
| }; |
| inline constexpr destroying_delete_t destroying_delete{}; // C++20 |
| |
| struct nothrow_t { explicit nothrow_t() = default; }; |
| extern const nothrow_t nothrow; |
| typedef void (*new_handler)(); |
| new_handler set_new_handler(new_handler new_p) noexcept; |
| new_handler get_new_handler() noexcept; |
| |
| // 21.6.4, pointer optimization barrier |
| template <class T> constexpr T* launder(T* p) noexcept; // C++17 |
| } // std |
| |
| void* operator new(std::size_t size); // replaceable, nodiscard in C++20 |
| void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++20 |
| void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20 |
| void* operator new(std::size_t size, std::align_val_t alignment, |
| const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++20 |
| void operator delete(void* ptr) noexcept; // replaceable |
| void operator delete(void* ptr, std::size_t size) noexcept; // replaceable, C++14 |
| void operator delete(void* ptr, std::align_val_t alignment) noexcept; // replaceable, C++17 |
| void operator delete(void* ptr, std::size_t size, |
| std::align_val_t alignment) noexcept; // replaceable, C++17 |
| void operator delete(void* ptr, const std::nothrow_t&) noexcept; // replaceable |
| void operator delete(void* ptr, std:align_val_t alignment, |
| const std::nothrow_t&) noexcept; // replaceable, C++17 |
| |
| void* operator new[](std::size_t size); // replaceable, nodiscard in C++20 |
| void* operator new[](std::size_t size, |
| std::align_val_t alignment) noexcept; // replaceable, C++17, nodiscard in C++20 |
| void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20 |
| void* operator new[](std::size_t size, std::align_val_t alignment, |
| const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++20 |
| void operator delete[](void* ptr) noexcept; // replaceable |
| void operator delete[](void* ptr, std::size_t size) noexcept; // replaceable, C++14 |
| void operator delete[](void* ptr, |
| std::align_val_t alignment) noexcept; // replaceable, C++17 |
| void operator delete[](void* ptr, std::size_t size, |
| std::align_val_t alignment) noexcept; // replaceable, C++17 |
| void operator delete[](void* ptr, const std::nothrow_t&) noexcept; // replaceable |
| void operator delete[](void* ptr, std::align_val_t alignment, |
| const std::nothrow_t&) noexcept; // replaceable, C++17 |
| |
| void* operator new (std::size_t size, void* ptr) noexcept; // nodiscard in C++20 |
| void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++20 |
| void operator delete (void* ptr, void*) noexcept; |
| void operator delete[](void* ptr, void*) noexcept; |
| |
| */ |
| |
| #include <__availability> |
| #include <__config> |
| #include <cstddef> |
| #include <cstdlib> |
| #include <exception> |
| #include <type_traits> |
| #include <version> |
| |
| #if defined(_LIBCPP_ABI_VCRUNTIME) |
| #include <new.h> |
| #endif |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| #if !defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309L |
| #define _LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION |
| #endif |
| |
| #if !defined(_LIBCPP_BUILDING_LIBRARY) && _LIBCPP_STD_VER < 14 && \ |
| defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) |
| # define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION |
| #endif |
| |
| #if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || \ |
| defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) |
| # define _LIBCPP_HAS_NO_SIZED_DEALLOCATION |
| #endif |
| |
| namespace std // purposefully not using versioning namespace |
| { |
| |
| #if !defined(_LIBCPP_ABI_VCRUNTIME) |
| struct _LIBCPP_TYPE_VIS nothrow_t { explicit nothrow_t() = default; }; |
| extern _LIBCPP_FUNC_VIS const nothrow_t nothrow; |
| |
| class _LIBCPP_EXCEPTION_ABI bad_alloc |
| : public exception |
| { |
| public: |
| bad_alloc() _NOEXCEPT; |
| virtual ~bad_alloc() _NOEXCEPT; |
| virtual const char* what() const _NOEXCEPT; |
| }; |
| |
| class _LIBCPP_EXCEPTION_ABI bad_array_new_length |
| : public bad_alloc |
| { |
| public: |
| bad_array_new_length() _NOEXCEPT; |
| virtual ~bad_array_new_length() _NOEXCEPT; |
| virtual const char* what() const _NOEXCEPT; |
| }; |
| |
| typedef void (*new_handler)(); |
| _LIBCPP_FUNC_VIS new_handler set_new_handler(new_handler) _NOEXCEPT; |
| _LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT; |
| |
| #endif // !_LIBCPP_ABI_VCRUNTIME |
| |
| _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_bad_alloc(); // not in C++ spec |
| |
| #if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && \ |
| !defined(_LIBCPP_ABI_VCRUNTIME) |
| #ifndef _LIBCPP_CXX03_LANG |
| enum class _LIBCPP_ENUM_VIS align_val_t : size_t { }; |
| #else |
| enum align_val_t { __zero = 0, __max = (size_t)-1 }; |
| #endif |
| #endif |
| |
| #if _LIBCPP_STD_VER > 17 |
| // Enable the declaration even if the compiler doesn't support the language |
| // feature. |
| struct destroying_delete_t { |
| explicit destroying_delete_t() = default; |
| }; |
| inline constexpr destroying_delete_t destroying_delete{}; |
| #endif // _LIBCPP_STD_VER > 17 |
| |
| } // std |
| |
| #if defined(_LIBCPP_CXX03_LANG) |
| #define _THROW_BAD_ALLOC throw(std::bad_alloc) |
| #else |
| #define _THROW_BAD_ALLOC |
| #endif |
| |
| #if !defined(_LIBCPP_ABI_VCRUNTIME) |
| |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; |
| #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION |
| _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; |
| #endif |
| |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT; |
| #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION |
| _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; |
| #endif |
| |
| #ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; |
| #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION |
| _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; |
| #endif |
| |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; |
| _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; |
| _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; |
| #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION |
| _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; |
| #endif |
| #endif |
| |
| _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new (std::size_t, void* __p) _NOEXCEPT {return __p;} |
| _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;} |
| inline _LIBCPP_INLINE_VISIBILITY void operator delete (void*, void*) _NOEXCEPT {} |
| inline _LIBCPP_INLINE_VISIBILITY void operator delete[](void*, void*) _NOEXCEPT {} |
| |
| #endif // !_LIBCPP_ABI_VCRUNTIME |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| _LIBCPP_CONSTEXPR inline _LIBCPP_INLINE_VISIBILITY bool __is_overaligned_for_new(size_t __align) _NOEXCEPT { |
| #ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__ |
| return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__; |
| #else |
| return __align > alignment_of<max_align_t>::value; |
| #endif |
| } |
| |
| template <class ..._Args> |
| _LIBCPP_INLINE_VISIBILITY |
| void* __libcpp_operator_new(_Args ...__args) { |
| #if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) |
| return __builtin_operator_new(__args...); |
| #else |
| return ::operator new(__args...); |
| #endif |
| } |
| |
| template <class ..._Args> |
| _LIBCPP_INLINE_VISIBILITY |
| void __libcpp_operator_delete(_Args ...__args) { |
| #if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) |
| __builtin_operator_delete(__args...); |
| #else |
| ::operator delete(__args...); |
| #endif |
| } |
| |
| inline _LIBCPP_INLINE_VISIBILITY |
| void *__libcpp_allocate(size_t __size, size_t __align) { |
| #ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION |
| if (__is_overaligned_for_new(__align)) { |
| const align_val_t __align_val = static_cast<align_val_t>(__align); |
| return __libcpp_operator_new(__size, __align_val); |
| } |
| #endif |
| |
| (void)__align; |
| return __libcpp_operator_new(__size); |
| } |
| |
| template <class ..._Args> |
| _LIBCPP_INLINE_VISIBILITY |
| void __do_deallocate_handle_size(void *__ptr, size_t __size, _Args ...__args) { |
| #ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION |
| (void)__size; |
| return __libcpp_operator_delete(__ptr, __args...); |
| #else |
| return __libcpp_operator_delete(__ptr, __size, __args...); |
| #endif |
| } |
| |
| inline _LIBCPP_INLINE_VISIBILITY |
| void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) { |
| #if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) |
| (void)__align; |
| return __do_deallocate_handle_size(__ptr, __size); |
| #else |
| if (__is_overaligned_for_new(__align)) { |
| const align_val_t __align_val = static_cast<align_val_t>(__align); |
| return __do_deallocate_handle_size(__ptr, __size, __align_val); |
| } else { |
| return __do_deallocate_handle_size(__ptr, __size); |
| } |
| #endif |
| } |
| |
| inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate_unsized(void* __ptr, size_t __align) { |
| #if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) |
| (void)__align; |
| return __libcpp_operator_delete(__ptr); |
| #else |
| if (__is_overaligned_for_new(__align)) { |
| const align_val_t __align_val = static_cast<align_val_t>(__align); |
| return __libcpp_operator_delete(__ptr, __align_val); |
| } else { |
| return __libcpp_operator_delete(__ptr); |
| } |
| #endif |
| } |
| |
| #if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) |
| // Low-level helpers to call the aligned allocation and deallocation functions |
| // on the target platform. This is used to implement libc++'s own memory |
| // allocation routines -- if you need to allocate memory inside the library, |
| // chances are that you want to use `__libcpp_allocate` instead. |
| // |
| // Returns the allocated memory, or `nullptr` on failure. |
| inline _LIBCPP_INLINE_VISIBILITY |
| void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) { |
| #if defined(_LIBCPP_MSVCRT_LIKE) |
| return ::_aligned_malloc(__size, __alignment); |
| #else |
| void* __result = nullptr; |
| (void)::posix_memalign(&__result, __alignment, __size); |
| // If posix_memalign fails, __result is unmodified so we still return `nullptr`. |
| return __result; |
| #endif |
| } |
| |
| inline _LIBCPP_INLINE_VISIBILITY |
| void __libcpp_aligned_free(void* __ptr) { |
| #if defined(_LIBCPP_MSVCRT_LIKE) |
| ::_aligned_free(__ptr); |
| #else |
| ::free(__ptr); |
| #endif |
| } |
| #endif // !_LIBCPP_HAS_NO_ALIGNED_ALLOCATION |
| |
| |
| template <class _Tp> |
| _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI |
| _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT |
| { |
| static_assert (!(is_function<_Tp>::value), "can't launder functions" ); |
| static_assert (!(is_same<void, typename remove_cv<_Tp>::type>::value), "can't launder cv-void" ); |
| return __builtin_launder(__p); |
| } |
| |
| #if _LIBCPP_STD_VER > 14 |
| template <class _Tp> |
| _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI |
| constexpr _Tp* launder(_Tp* __p) noexcept |
| { |
| return _VSTD::__launder(__p); |
| } |
| #endif |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_NEW |