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clang-p2996/libcxx/include/new
Paul Kirth 56a34451e1 [libcxx] Fix using the vcruntime ABI with _HAS_EXCEPTIONS=0 defined 
_HAS_EXCEPTIONS=0 allows disabling the exception parts of the MS STL
and vcruntime, and e.g. compiler-rt/lib/fuzzer sets this define (to
work around issues with MS STL). If using libc++ instead of MS STL,
this define previously broke the libc++ headers.

If _HAS_EXCEPTIONS is set to 0, the vcruntime_exception.h header
doesn't define the ABI base class std::exception. If no exceptions
are going to be thrown, this probably is fine (although it also
breaks using subclasses of it as regular objects that aren't thrown),
but it requires ifdeffing out all subclasses of all exception/error
derived objects (which are sprinkled throughout the headers).

Instead, libc++ will supply an ABI compatible definition when
_HAS_EXCEPTIONS is set to 0, which will make the class hierarchies
complete.

In this build configuration, one can still create instances of
exception subclasses, and those objects will be ABI incompatible
with the ones from when _HAS_EXCEPTIONS isn't defined to 0 - but
one may argue that's a pathological/self-imposed problem in that case.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D103947
2022-08-17 21:14:25 +00:00

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// -*- 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 <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 <__assert> // all public C++ headers provide the assertion handler
#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;
#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 // !_LIBCPP_ABI_VCRUNTIME
// When _HAS_EXCEPTIONS == 0, these complete definitions are needed,
// since they would normally be provided in vcruntime_exception.h
class bad_alloc : public exception {
public:
bad_alloc() noexcept : exception("bad allocation") {}
private:
friend class bad_array_new_length;
bad_alloc(char const* const __message) noexcept : exception(__message) {}
};
class bad_array_new_length : public bad_alloc {
public:
bad_array_new_length() noexcept : bad_alloc("bad array new length") {}
};
#endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) &&_HAS_EXCEPTIONS == 0
_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<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
#if _LIBCPP_STD_VER > 14
#if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
inline constexpr size_t hardware_destructive_interference_size = __GCC_DESTRUCTIVE_SIZE;
inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE;
#endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
#endif // _LIBCPP_STD_VER > 14
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_NEW
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