// -*- 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_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 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 #include #include #include #include #if defined(_LIBCPP_ABI_VCRUNTIME) #include #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 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY void __throw_bad_array_new_length() { #ifndef _LIBCPP_NO_EXCEPTIONS throw bad_array_new_length(); #else _VSTD::abort(); #endif } #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 } // namespace 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::value; #endif } template _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 _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); return __libcpp_operator_new(__size, __align_val); } #endif (void)__align; return __libcpp_operator_new(__size); } template _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); 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); 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 _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::type>::value), "can't launder cv-void" ); return __builtin_launder(__p); } #if _LIBCPP_STD_VER > 14 template _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