mirror of
https://github.com/ziglang/zig.git
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411 lines
16 KiB
C++
Vendored
411 lines
16 KiB
C++
Vendored
// -*- 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_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 destroying_delete_t { // C++20
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explicit destroying_delete_t() = default;
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};
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inline constexpr destroying_delete_t destroying_delete{}; // C++20
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struct nothrow_t { explicit nothrow_t() = default; };
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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++20
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void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++20
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void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20
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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++20
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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++20
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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++20
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void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20
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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++20
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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++20
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void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++20
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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 <__assert> // all public C++ headers provide the assertion handler
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#include <__availability>
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#include <__config>
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#include <__type_traits/is_function.h>
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#include <__type_traits/is_same.h>
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#include <__type_traits/remove_cv.h>
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#include <cstddef>
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#include <cstdlib>
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#include <exception>
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#include <version>
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#if defined(_LIBCPP_ABI_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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namespace std // purposefully not using versioning namespace
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{
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#if !defined(_LIBCPP_ABI_VCRUNTIME)
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struct _LIBCPP_TYPE_VIS nothrow_t { explicit nothrow_t() = default; };
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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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~bad_alloc() _NOEXCEPT override;
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const char* what() const _NOEXCEPT override;
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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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~bad_array_new_length() _NOEXCEPT override;
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const char* what() const _NOEXCEPT override;
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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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#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 // !_LIBCPP_ABI_VCRUNTIME
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// When _HAS_EXCEPTIONS == 0, these complete definitions are needed,
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// since they would normally be provided in vcruntime_exception.h
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class bad_alloc : public exception {
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public:
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bad_alloc() noexcept : exception("bad allocation") {}
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private:
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friend class bad_array_new_length;
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bad_alloc(char const* const __message) noexcept : exception(__message) {}
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};
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class bad_array_new_length : public bad_alloc {
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public:
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bad_array_new_length() noexcept : bad_alloc("bad array new length") {}
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};
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#endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0
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_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_bad_alloc(); // not in C++ spec
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_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
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void __throw_bad_array_new_length()
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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throw bad_array_new_length();
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#else
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_VSTD::abort();
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#endif
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}
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#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && \
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!defined(_LIBCPP_ABI_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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#if _LIBCPP_STD_VER > 17
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// Enable the declaration even if the compiler doesn't support the language
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// feature.
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struct destroying_delete_t {
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explicit destroying_delete_t() = default;
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};
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inline constexpr destroying_delete_t destroying_delete{};
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#endif // _LIBCPP_STD_VER > 17
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} // namespace 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_ABI_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 _LIBCPP_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 _LIBCPP_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 _LIBCPP_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 _LIBCPP_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_ABI_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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template <class ..._Args>
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_LIBCPP_INLINE_VISIBILITY
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void* __libcpp_operator_new(_Args ...__args) {
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#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete)
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return __builtin_operator_new(__args...);
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#else
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return ::operator new(__args...);
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#endif
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}
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template <class ..._Args>
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_LIBCPP_INLINE_VISIBILITY
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void __libcpp_operator_delete(_Args ...__args) {
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#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete)
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__builtin_operator_delete(__args...);
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#else
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::operator delete(__args...);
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#endif
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}
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inline _LIBCPP_INLINE_VISIBILITY
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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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return __libcpp_operator_new(__size, __align_val);
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}
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#endif
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(void)__align;
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return __libcpp_operator_new(__size);
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}
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template <class ..._Args>
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_LIBCPP_INLINE_VISIBILITY
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void __do_deallocate_handle_size(void *__ptr, size_t __size, _Args ...__args) {
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#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
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(void)__size;
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return std::__libcpp_operator_delete(__ptr, __args...);
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#else
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return std::__libcpp_operator_delete(__ptr, __size, __args...);
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#endif
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}
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inline _LIBCPP_INLINE_VISIBILITY
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void __libcpp_deallocate(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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inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate_unsized(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 __libcpp_operator_delete(__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 __libcpp_operator_delete(__ptr, __align_val);
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} else {
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return __libcpp_operator_delete(__ptr);
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}
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#endif
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}
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#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION)
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// Low-level helpers to call the aligned allocation and deallocation functions
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// on the target platform. This is used to implement libc++'s own memory
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// allocation routines -- if you need to allocate memory inside the library,
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// chances are that you want to use `__libcpp_allocate` instead.
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//
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// Returns the allocated memory, or `nullptr` on failure.
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inline _LIBCPP_INLINE_VISIBILITY void* __libcpp_aligned_alloc(std::size_t __alignment, std::size_t __size) {
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# if defined(_LIBCPP_MSVCRT_LIKE)
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return ::_aligned_malloc(__size, __alignment);
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# elif _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_C11_ALIGNED_ALLOC)
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// aligned_alloc() requires that __size is a multiple of __alignment,
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// but for C++ [new.delete.general], only states "if the value of an
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// alignment argument passed to any of these functions is not a valid
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// alignment value, the behavior is undefined".
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// To handle calls such as ::operator new(1, std::align_val_t(128)), we
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// round __size up to the next multiple of __alignment.
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size_t __rounded_size = (__size + __alignment - 1) & ~(__alignment - 1);
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// Rounding up could have wrapped around to zero, so we have to add another
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// max() ternary to the actual call site to avoid succeeded in that case.
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return ::aligned_alloc(__alignment, __size > __rounded_size ? __size : __rounded_size);
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# else
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void* __result = nullptr;
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(void)::posix_memalign(&__result, __alignment, __size);
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// If posix_memalign fails, __result is unmodified so we still return `nullptr`.
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return __result;
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# endif
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}
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inline _LIBCPP_INLINE_VISIBILITY
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void __libcpp_aligned_free(void* __ptr) {
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#if defined(_LIBCPP_MSVCRT_LIKE)
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::_aligned_free(__ptr);
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#else
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::free(__ptr);
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#endif
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}
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#endif // !_LIBCPP_HAS_NO_ALIGNED_ALLOCATION
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template <class _Tp>
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_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI
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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, __remove_cv_t<_Tp> >::value), "can't launder cv-void" );
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return __builtin_launder(__p);
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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_HIDE_FROM_ABI
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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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#if _LIBCPP_STD_VER > 14
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#if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
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inline constexpr size_t hardware_destructive_interference_size = __GCC_DESTRUCTIVE_SIZE;
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inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE;
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#endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
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# include <type_traits>
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#endif
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#endif // _LIBCPP_NEW
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