359 lines
13 KiB
C++
359 lines
13 KiB
C++
// -*- C++ -*-
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//===----------------------------- new ------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_NEW
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#define _LIBCPP_NEW
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/*
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new synopsis
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namespace std
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{
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class bad_alloc
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: public exception
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{
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public:
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bad_alloc() noexcept;
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bad_alloc(const bad_alloc&) noexcept;
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bad_alloc& operator=(const bad_alloc&) noexcept;
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virtual const char* what() const noexcept;
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};
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class bad_array_new_length : public bad_alloc // C++14
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{
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public:
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bad_array_new_length() noexcept;
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};
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enum class align_val_t : size_t {}; // C++17
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struct nothrow_t {};
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extern const nothrow_t nothrow;
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typedef void (*new_handler)();
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new_handler set_new_handler(new_handler new_p) noexcept;
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new_handler get_new_handler() noexcept;
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// 21.6.4, pointer optimization barrier
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template <class T> constexpr T* launder(T* p) noexcept; // C++17
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} // std
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void* operator new(std::size_t size); // replaceable, nodiscard in C++2a
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void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++2a
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void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a
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void* operator new(std::size_t size, std::align_val_t alignment,
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const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++2a
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void operator delete(void* ptr) noexcept; // replaceable
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void operator delete(void* ptr, std::size_t size) noexcept; // replaceable, C++14
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void operator delete(void* ptr, std::align_val_t alignment) noexcept; // replaceable, C++17
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void operator delete(void* ptr, std::size_t size,
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std::align_val_t alignment) noexcept; // replaceable, C++17
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void operator delete(void* ptr, const std::nothrow_t&) noexcept; // replaceable
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void operator delete(void* ptr, std:align_val_t alignment,
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const std::nothrow_t&) noexcept; // replaceable, C++17
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void* operator new[](std::size_t size); // replaceable, nodiscard in C++2a
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void* operator new[](std::size_t size,
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std::align_val_t alignment) noexcept; // replaceable, C++17, nodiscard in C++2a
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void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a
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void* operator new[](std::size_t size, std::align_val_t alignment,
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const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++2a
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void operator delete[](void* ptr) noexcept; // replaceable
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void operator delete[](void* ptr, std::size_t size) noexcept; // replaceable, C++14
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void operator delete[](void* ptr,
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std::align_val_t alignment) noexcept; // replaceable, C++17
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void operator delete[](void* ptr, std::size_t size,
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std::align_val_t alignment) noexcept; // replaceable, C++17
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void operator delete[](void* ptr, const std::nothrow_t&) noexcept; // replaceable
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void operator delete[](void* ptr, std::align_val_t alignment,
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const std::nothrow_t&) noexcept; // replaceable, C++17
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void* operator new (std::size_t size, void* ptr) noexcept; // nodiscard in C++2a
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void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++2a
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void operator delete (void* ptr, void*) noexcept;
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void operator delete[](void* ptr, void*) noexcept;
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*/
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#include <__config>
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#include <exception>
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#include <type_traits>
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#include <cstddef>
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#include <version>
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#ifdef _LIBCPP_NO_EXCEPTIONS
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#include <cstdlib>
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#endif
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#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
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#include <new.h>
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#endif
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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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#if !defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309L
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#define _LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION
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#endif
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#if !defined(_LIBCPP_BUILDING_LIBRARY) && _LIBCPP_STD_VER < 14 && \
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defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION)
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# define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
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#endif
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#if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || \
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defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION)
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# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION
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#endif
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#if !__has_builtin(__builtin_operator_new) || \
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__has_builtin(__builtin_operator_new) < 201802L
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#define _LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE
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#endif
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namespace std // purposefully not using versioning namespace
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{
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#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
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struct _LIBCPP_TYPE_VIS nothrow_t {};
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extern _LIBCPP_FUNC_VIS const nothrow_t nothrow;
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class _LIBCPP_EXCEPTION_ABI bad_alloc
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: public exception
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{
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public:
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bad_alloc() _NOEXCEPT;
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virtual ~bad_alloc() _NOEXCEPT;
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virtual const char* what() const _NOEXCEPT;
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};
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class _LIBCPP_EXCEPTION_ABI bad_array_new_length
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: public bad_alloc
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{
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public:
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bad_array_new_length() _NOEXCEPT;
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virtual ~bad_array_new_length() _NOEXCEPT;
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virtual const char* what() const _NOEXCEPT;
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};
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typedef void (*new_handler)();
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_LIBCPP_FUNC_VIS new_handler set_new_handler(new_handler) _NOEXCEPT;
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_LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT;
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#endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME
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_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_bad_alloc(); // not in C++ spec
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#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && \
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!defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME)
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#ifndef _LIBCPP_CXX03_LANG
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enum class _LIBCPP_ENUM_VIS align_val_t : size_t { };
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#else
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enum align_val_t { __zero = 0, __max = (size_t)-1 };
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#endif
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#endif
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} // std
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#if defined(_LIBCPP_CXX03_LANG)
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#define _THROW_BAD_ALLOC throw(std::bad_alloc)
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#else
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#define _THROW_BAD_ALLOC
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#endif
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#if !defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME)
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC;
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;
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#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
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_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz) _NOEXCEPT;
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#endif
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC;
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;
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#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
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_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT;
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#endif
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#ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
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_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;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
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#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
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_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
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#endif
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_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
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_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;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT;
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_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
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#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
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_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
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#endif
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#endif
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_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new (std::size_t, void* __p) _NOEXCEPT {return __p;}
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_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;}
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inline _LIBCPP_INLINE_VISIBILITY void operator delete (void*, void*) _NOEXCEPT {}
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inline _LIBCPP_INLINE_VISIBILITY void operator delete[](void*, void*) _NOEXCEPT {}
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#endif // !_LIBCPP_DEFER_NEW_TO_VCRUNTIME
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_CONSTEXPR inline _LIBCPP_INLINE_VISIBILITY bool __is_overaligned_for_new(size_t __align) _NOEXCEPT {
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#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
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return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__;
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#else
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return __align > alignment_of<max_align_t>::value;
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#endif
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}
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inline _LIBCPP_INLINE_VISIBILITY void *__libcpp_allocate(size_t __size, size_t __align) {
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#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
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if (__is_overaligned_for_new(__align)) {
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const align_val_t __align_val = static_cast<align_val_t>(__align);
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# ifdef _LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE
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return ::operator new(__size, __align_val);
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# else
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return __builtin_operator_new(__size, __align_val);
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# endif
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}
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#else
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((void)__align);
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#endif
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#ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE
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return ::operator new(__size);
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#else
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return __builtin_operator_new(__size);
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#endif
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}
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struct _DeallocateCaller {
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static inline _LIBCPP_INLINE_VISIBILITY
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void __do_deallocate_handle_size_align(void *__ptr, size_t __size, size_t __align) {
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#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
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((void)__align);
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return __do_deallocate_handle_size(__ptr, __size);
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#else
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if (__is_overaligned_for_new(__align)) {
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const align_val_t __align_val = static_cast<align_val_t>(__align);
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return __do_deallocate_handle_size(__ptr, __size, __align_val);
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} else {
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return __do_deallocate_handle_size(__ptr, __size);
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}
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#endif
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}
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static inline _LIBCPP_INLINE_VISIBILITY
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void __do_deallocate_handle_align(void *__ptr, size_t __align) {
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#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
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((void)__align);
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return __do_call(__ptr);
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#else
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if (__is_overaligned_for_new(__align)) {
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const align_val_t __align_val = static_cast<align_val_t>(__align);
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return __do_call(__ptr, __align_val);
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} else {
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return __do_call(__ptr);
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}
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#endif
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}
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private:
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static inline void __do_deallocate_handle_size(void *__ptr, size_t __size) {
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#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
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((void)__size);
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return __do_call(__ptr);
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#else
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return __do_call(__ptr, __size);
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#endif
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}
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#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
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static inline void __do_deallocate_handle_size(void *__ptr, size_t __size, align_val_t __align) {
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#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
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((void)__size);
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return __do_call(__ptr, __align);
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#else
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return __do_call(__ptr, __size, __align);
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#endif
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}
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#endif
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private:
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template <class _A1, class _A2>
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static inline void __do_call(void *__ptr, _A1 __a1, _A2 __a2) {
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#if defined(_LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE) || \
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defined(_LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE)
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return ::operator delete(__ptr, __a1, __a2);
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#else
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return __builtin_operator_delete(__ptr, __a1, __a2);
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#endif
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}
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template <class _A1>
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static inline void __do_call(void *__ptr, _A1 __a1) {
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#if defined(_LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE) || \
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defined(_LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE)
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return ::operator delete(__ptr, __a1);
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#else
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return __builtin_operator_delete(__ptr, __a1);
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#endif
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}
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static inline void __do_call(void *__ptr) {
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#ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE
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return ::operator delete(__ptr);
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#else
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return __builtin_operator_delete(__ptr);
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#endif
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}
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};
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inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) {
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_DeallocateCaller::__do_deallocate_handle_size_align(__ptr, __size, __align);
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}
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inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate_unsized(void* __ptr, size_t __align) {
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_DeallocateCaller::__do_deallocate_handle_align(__ptr, __align);
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}
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template <class _Tp>
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_LIBCPP_NODISCARD_AFTER_CXX17 inline
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_LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT
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{
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static_assert (!(is_function<_Tp>::value), "can't launder functions" );
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static_assert (!(is_same<void, typename remove_cv<_Tp>::type>::value), "can't launder cv-void" );
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#ifdef _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER
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return __builtin_launder(__p);
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#else
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return __p;
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#endif
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}
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#if _LIBCPP_STD_VER > 14
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template <class _Tp>
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_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY
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constexpr _Tp* launder(_Tp* __p) noexcept
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{
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return _VSTD::__launder(__p);
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_NEW
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