// -*- 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___CONFIG
#define _LIBCPP___CONFIG
#include <__config_site>
#include <__configuration/abi.h>
#include <__configuration/availability.h>
#include <__configuration/compiler.h>
#include <__configuration/platform.h>
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
# pragma GCC system_header
#endif
#ifdef __cplusplus
// The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html
// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is
// defined to XXYYZZ.
# define _LIBCPP_VERSION 200000
# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)
# if __STDC_HOSTED__ == 0
# define _LIBCPP_FREESTANDING
# endif
// HARDENING {
// This is for backward compatibility -- make enabling `_LIBCPP_ENABLE_ASSERTIONS` (which predates hardening modes)
// equivalent to setting the extensive mode. This is deprecated and will be removed in LLVM 20.
# ifdef _LIBCPP_ENABLE_ASSERTIONS
# warning "_LIBCPP_ENABLE_ASSERTIONS is deprecated, please use _LIBCPP_HARDENING_MODE instead"
# if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 1
# error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1"
# endif
# if _LIBCPP_ENABLE_ASSERTIONS
# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_EXTENSIVE
# endif
# endif
// The library provides the macro `_LIBCPP_HARDENING_MODE` which can be set to one of the following values:
//
// - `_LIBCPP_HARDENING_MODE_NONE`;
// - `_LIBCPP_HARDENING_MODE_FAST`;
// - `_LIBCPP_HARDENING_MODE_EXTENSIVE`;
// - `_LIBCPP_HARDENING_MODE_DEBUG`.
//
// These values have the following effects:
//
// - `_LIBCPP_HARDENING_MODE_NONE` -- sets the hardening mode to "none" which disables all runtime hardening checks;
//
// - `_LIBCPP_HARDENING_MODE_FAST` -- sets that hardening mode to "fast". The fast mode enables security-critical checks
// that can be done with relatively little runtime overhead in constant time;
//
// - `_LIBCPP_HARDENING_MODE_EXTENSIVE` -- sets the hardening mode to "extensive". The extensive mode is a superset of
// the fast mode that additionally enables checks that are relatively cheap and prevent common types of logic errors
// but are not necessarily security-critical;
//
// - `_LIBCPP_HARDENING_MODE_DEBUG` -- sets the hardening mode to "debug". The debug mode is a superset of the extensive
// mode and enables all checks available in the library, including internal assertions. Checks that are part of the
// debug mode can be very expensive and thus the debug mode is intended to be used for testing, not in production.
// Inside the library, assertions are categorized so they can be cherry-picked based on the chosen hardening mode. These
// macros are only for internal use -- users should only pick one of the high-level hardening modes described above.
//
// - `_LIBCPP_ASSERT_VALID_INPUT_RANGE` -- checks that ranges (whether expressed as an iterator pair, an iterator and
// a sentinel, an iterator and a count, or a `std::range`) given as input to library functions are valid:
// - the sentinel is reachable from the begin iterator;
// - TODO(hardening): both iterators refer to the same container.
//
// - `_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS` -- checks that any attempts to access a container element, whether through
// the container object or through an iterator, are valid and do not attempt to go out of bounds or otherwise access
// a non-existent element. For iterator checks to work, bounded iterators must be enabled in the ABI. Types like
// `optional` and `function` are considered one-element containers for the purposes of this check.
//
// - `_LIBCPP_ASSERT_NON_NULL` -- checks that the pointer being dereferenced is not null. On most modern platforms zero
// address does not refer to an actual location in memory, so a null pointer dereference would not compromize the
// memory security of a program (however, it is still undefined behavior that can result in strange errors due to
// compiler optimizations).
//
// - `_LIBCPP_ASSERT_NON_OVERLAPPING_RANGES` -- for functions that take several ranges as arguments, checks that the
// given ranges do not overlap.
//
// - `_LIBCPP_ASSERT_VALID_DEALLOCATION` -- checks that an attempt to deallocate memory is valid (e.g. the given object
// was allocated by the given allocator). Violating this category typically results in a memory leak.
//
// - `_LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL` -- checks that a call to an external API doesn't fail in
// an unexpected manner. This includes triggering documented cases of undefined behavior in an external library (like
// attempting to unlock an unlocked mutex in pthreads). Any API external to the library falls under this category
// (from system calls to compiler intrinsics). We generally don't expect these failures to compromize memory safety or
// otherwise create an immediate security issue.
//
// - `_LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR` -- checks any operations that exchange nodes between containers to make sure
// the containers have compatible allocators.
//
// - `_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN` -- checks that the given argument is within the domain of valid arguments
// for the function. Violating this typically produces an incorrect result (e.g. the clamp algorithm returns the
// original value without clamping it due to incorrect functors) or puts an object into an invalid state (e.g.
// a string view where only a subset of elements is possible to access). This category is for assertions violating
// which doesn't cause any immediate issues in the library -- whatever the consequences are, they will happen in the
// user code.
//
// - `_LIBCPP_ASSERT_PEDANTIC` -- checks prerequisites which are imposed by the Standard, but violating which happens to
// be benign in our implementation.
//
// - `_LIBCPP_ASSERT_SEMANTIC_REQUIREMENT` -- checks that the given argument satisfies the semantic requirements imposed
// by the Standard. Typically, there is no simple way to completely prove that a semantic requirement is satisfied;
// thus, this would often be a heuristic check and it might be quite expensive.
//
// - `_LIBCPP_ASSERT_INTERNAL` -- checks that internal invariants of the library hold. These assertions don't depend on
// user input.
//
// - `_LIBCPP_ASSERT_UNCATEGORIZED` -- for assertions that haven't been properly classified yet.
// clang-format off
# define _LIBCPP_HARDENING_MODE_NONE (1 << 1)
# define _LIBCPP_HARDENING_MODE_FAST (1 << 2)
# define _LIBCPP_HARDENING_MODE_EXTENSIVE (1 << 4) // Deliberately not ordered.
# define _LIBCPP_HARDENING_MODE_DEBUG (1 << 3)
// clang-format on
# ifndef _LIBCPP_HARDENING_MODE
# ifndef _LIBCPP_HARDENING_MODE_DEFAULT
# error _LIBCPP_HARDENING_MODE_DEFAULT is not defined. This definition should be set at configuration time in the \
`__config_site` header, please make sure your installation of libc++ is not broken.
# endif
# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_DEFAULT
# endif
# if _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_NONE && \
_LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_FAST && \
_LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_EXTENSIVE && \
_LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_DEBUG
# error _LIBCPP_HARDENING_MODE must be set to one of the following values: \
_LIBCPP_HARDENING_MODE_NONE, \
_LIBCPP_HARDENING_MODE_FAST, \
_LIBCPP_HARDENING_MODE_EXTENSIVE, \
_LIBCPP_HARDENING_MODE_DEBUG
# endif
// } HARDENING
# define _LIBCPP_TOSTRING2(x) #x
# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
// NOLINTNEXTLINE(libcpp-cpp-version-check)
# if __cplusplus < 201103L
# define _LIBCPP_CXX03_LANG
# endif
# ifndef __has_constexpr_builtin
# define __has_constexpr_builtin(x) 0
# endif
// This checks wheter a Clang module is built
# ifndef __building_module
# define __building_module(...) 0
# endif
// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by
// the compiler and '1' otherwise.
# ifndef __is_identifier
# define __is_identifier(__x) 1
# endif
# ifndef __has_declspec_attribute
# define __has_declspec_attribute(__x) 0
# endif
# define __has_keyword(__x) !(__is_identifier(__x))
# ifndef __has_warning
# define __has_warning(...) 0
# endif
# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L
# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11"
# endif
// FIXME: ABI detection should be done via compiler builtin macros. This
// is just a placeholder until Clang implements such macros. For now assume
// that Windows compilers pretending to be MSVC++ target the Microsoft ABI,
// and allow the user to explicitly specify the ABI to handle cases where this
// heuristic falls short.
# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT)
# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined"
# elif defined(_LIBCPP_ABI_FORCE_ITANIUM)
# define _LIBCPP_ABI_ITANIUM
# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT)
# define _LIBCPP_ABI_MICROSOFT
# else
# if defined(_WIN32) && defined(_MSC_VER)
# define _LIBCPP_ABI_MICROSOFT
# else
# define _LIBCPP_ABI_ITANIUM
# endif
# endif
# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
# define _LIBCPP_ABI_VCRUNTIME
# endif
# if __has_feature(experimental_library)
# ifndef _LIBCPP_ENABLE_EXPERIMENTAL
# define _LIBCPP_ENABLE_EXPERIMENTAL
# endif
# endif
// Incomplete features get their own specific disabling flags. This makes it
// easier to grep for target specific flags once the feature is complete.
# if !defined(_LIBCPP_ENABLE_EXPERIMENTAL) && !defined(_LIBCPP_BUILDING_LIBRARY)
# define _LIBCPP_HAS_NO_INCOMPLETE_PSTL
# define _LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN
# define _LIBCPP_HAS_NO_EXPERIMENTAL_TZDB
# define _LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM
# endif
# if defined(__MVS__)
# include <features.h> // for __NATIVE_ASCII_F
# endif
# if defined(_WIN32)
# define _LIBCPP_WIN32API
# define _LIBCPP_SHORT_WCHAR 1
// Both MinGW and native MSVC provide a "MSVC"-like environment
# define _LIBCPP_MSVCRT_LIKE
// If mingw not explicitly detected, assume using MS C runtime only if
// a MS compatibility version is specified.
# if defined(_MSC_VER) && !defined(__MINGW32__)
# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library
# endif
# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__))
# define _LIBCPP_HAS_BITSCAN64
# endif
# define _LIBCPP_HAS_OPEN_WITH_WCHAR
# endif // defined(_WIN32)
# if defined(_AIX) && !defined(__64BIT__)
// The size of wchar is 2 byte on 32-bit mode on AIX.
# define _LIBCPP_SHORT_WCHAR 1
# endif
// Libc++ supports various implementations of std::random_device.
//
// _LIBCPP_USING_DEV_RANDOM
// Read entropy from the given file, by default `/dev/urandom`.
// If a token is provided, it is assumed to be the path to a file
// to read entropy from. This is the default behavior if nothing
// else is specified. This implementation requires storing state
// inside `std::random_device`.
//
// _LIBCPP_USING_ARC4_RANDOM
// Use arc4random(). This allows obtaining random data even when
// using sandboxing mechanisms. On some platforms like Apple, this
// is the recommended source of entropy for user-space programs.
// When this option is used, the token passed to `std::random_device`'s
// constructor *must* be "/dev/urandom" -- anything else is an error.
//
// _LIBCPP_USING_GETENTROPY
// Use getentropy().
// When this option is used, the token passed to `std::random_device`'s
// constructor *must* be "/dev/urandom" -- anything else is an error.
//
// _LIBCPP_USING_FUCHSIA_CPRNG
// Use Fuchsia's zx_cprng_draw() system call, which is specified to
// deliver high-quality entropy and cannot fail.
// When this option is used, the token passed to `std::random_device`'s
// constructor *must* be "/dev/urandom" -- anything else is an error.
//
// _LIBCPP_USING_NACL_RANDOM
// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access,
// including accesses to the special files under `/dev`. This implementation
// uses the NaCL syscall `nacl_secure_random_init()` to get entropy.
// When this option is used, the token passed to `std::random_device`'s
// constructor *must* be "/dev/urandom" -- anything else is an error.
//
// _LIBCPP_USING_WIN32_RANDOM
// Use rand_s(), for use on Windows.
// When this option is used, the token passed to `std::random_device`'s
// constructor *must* be "/dev/urandom" -- anything else is an error.
# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
defined(__DragonFly__)
# define _LIBCPP_USING_ARC4_RANDOM
# elif defined(__wasi__) || defined(__EMSCRIPTEN__)
# define _LIBCPP_USING_GETENTROPY
# elif defined(__Fuchsia__)
# define _LIBCPP_USING_FUCHSIA_CPRNG
# elif defined(__native_client__)
# define _LIBCPP_USING_NACL_RANDOM
# elif defined(_LIBCPP_WIN32API)
# define _LIBCPP_USING_WIN32_RANDOM
# else
# define _LIBCPP_USING_DEV_RANDOM
# endif
# ifndef _LIBCPP_CXX03_LANG
# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
# define _ALIGNAS_TYPE(x) alignas(x)
# define _ALIGNAS(x) alignas(x)
# define _LIBCPP_NORETURN [[noreturn]]
# define _NOEXCEPT noexcept
# define _NOEXCEPT_(...) noexcept(__VA_ARGS__)
# define _LIBCPP_CONSTEXPR constexpr
# else
# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)
# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
# define _ALIGNAS(x) __attribute__((__aligned__(x)))
# define _LIBCPP_NORETURN __attribute__((__noreturn__))
# define _LIBCPP_HAS_NO_NOEXCEPT
# define nullptr __nullptr
# define _NOEXCEPT throw()
# define _NOEXCEPT_(...)
# define static_assert(...) _Static_assert(__VA_ARGS__)
# define decltype(...) __decltype(__VA_ARGS__)
# define _LIBCPP_CONSTEXPR
typedef __char16_t char16_t;
typedef __char32_t char32_t;
# endif
# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)
// Objective-C++ features (opt-in)
# if __has_feature(objc_arc)
# define _LIBCPP_HAS_OBJC_ARC
# endif
# if __has_feature(objc_arc_weak)
# define _LIBCPP_HAS_OBJC_ARC_WEAK
# endif
# if __has_extension(blocks)
# define _LIBCPP_HAS_EXTENSION_BLOCKS
# endif
# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__)
# define _LIBCPP_HAS_BLOCKS_RUNTIME
# endif
# if !__has_feature(address_sanitizer)
# define _LIBCPP_HAS_NO_ASAN
# endif
# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__))
# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__
# if defined(_LIBCPP_OBJECT_FORMAT_COFF)
# ifdef _DLL
# define _LIBCPP_CRT_FUNC __declspec(dllimport)
# else
# define _LIBCPP_CRT_FUNC
# endif
# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY))
# define _LIBCPP_DLL_VIS
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS
# define _LIBCPP_EXPORTED_FROM_ABI
# elif defined(_LIBCPP_BUILDING_LIBRARY)
# define _LIBCPP_DLL_VIS __declspec(dllexport)
# if defined(__MINGW32__)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# else
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS
# endif
# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport)
# else
# define _LIBCPP_DLL_VIS __declspec(dllimport)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS
# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport)
# endif
# define _LIBCPP_HIDDEN
# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
# define _LIBCPP_TEMPLATE_VIS
# define _LIBCPP_TEMPLATE_DATA_VIS
# define _LIBCPP_TYPE_VISIBILITY_DEFAULT
# else
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis)))
# else
# define _LIBCPP_VISIBILITY(vis)
# endif
# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden")
# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default")
# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default")
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default")
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
// TODO: Make this a proper customization point or remove the option to override it.
# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default")
# endif
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
// The inline should be removed once PR32114 is resolved
# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN
# else
# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
# endif
// GCC doesn't support the type_visibility attribute, so we have to keep the visibility attribute on templates
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && !__has_attribute(__type_visibility__)
# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default")))
# else
# define _LIBCPP_TEMPLATE_VIS
# endif
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
# define _LIBCPP_TYPE_VISIBILITY_DEFAULT __attribute__((__type_visibility__("default")))
# else
# define _LIBCPP_TYPE_VISIBILITY_DEFAULT
# endif
# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF)
# if __has_attribute(exclude_from_explicit_instantiation)
# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__))
# else
// Try to approximate the effect of exclude_from_explicit_instantiation
// (which is that entities are not assumed to be provided by explicit
// template instantiations in the dylib) by always inlining those entities.
# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE
# endif
# ifdef _LIBCPP_COMPILER_CLANG_BASED
# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push")
# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop")
# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str))
# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str)
# elif defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push")
# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop")
# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str)
# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str))
# else
# define _LIBCPP_DIAGNOSTIC_PUSH
# define _LIBCPP_DIAGNOSTIC_POP
# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str)
# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str)
# endif
# if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST
# define _LIBCPP_HARDENING_SIG f
# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE
# define _LIBCPP_HARDENING_SIG s
# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG
# define _LIBCPP_HARDENING_SIG d
# else
# define _LIBCPP_HARDENING_SIG n // "none"
# endif
# ifdef _LIBCPP_HAS_NO_EXCEPTIONS
# define _LIBCPP_EXCEPTIONS_SIG n
# else
# define _LIBCPP_EXCEPTIONS_SIG e
# endif
# define _LIBCPP_ODR_SIGNATURE \
_LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION)
// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved
// on two levels:
// 1. The symbol is given hidden visibility, which ensures that users won't start exporting
// symbols from their dynamic library by means of using the libc++ headers. This ensures
// that those symbols stay private to the dynamic library in which it is defined.
//
// 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library.
// This ensures that no ODR violation can arise from mixing two TUs compiled with different
// versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the
// program contains two definitions of a function, the ODR requires them to be token-by-token
// equivalent, and the linker is allowed to pick either definition and discard the other one.
//
// For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled
// *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs
// compiled with different settings), the two definitions are both visible by the linker and they
// have the same name, but they have a meaningfully different implementation (one throws an exception
// and the other aborts the program). This violates the ODR and makes the program ill-formed, and in
// practice what will happen is that the linker will pick one of the definitions at random and will
// discard the other one. This can quite clearly lead to incorrect program behavior.
//
// A similar reasoning holds for many other properties that are ODR-affecting. Essentially any
// property that causes the code of a function to differ from the code in another configuration
// can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI
// tag, but we encode the ones that we think are most important: library version, exceptions, and
// hardening mode.
//
// Note that historically, solving this problem has been achieved in various ways, including
// force-inlining all functions or giving internal linkage to all functions. Both these previous
// solutions suffer from drawbacks that lead notably to code bloat.
//
// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend
// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library.
//
// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions
// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled
// name of a virtual function is part of its ABI, since some architectures like arm64e can sign
// the virtual function pointer in the vtable based on the mangled name of the function. Since
// we use an ABI tag that changes with each released version, the mangled name of the virtual
// function would change, which is incorrect. Note that it doesn't make much sense to change
// the implementation of a virtual function in an ABI-incompatible way in the first place,
// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable.
//
// The macro can be applied to record and enum types. When the tagged type is nested in
// a record this "parent" record needs to have the macro too. Another use case for applying
// this macro to records and unions is to apply an ABI tag to inline constexpr variables.
// This can be useful for inline variables that are implementation details which are expected
// to change in the future.
//
// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing
// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and
// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70.
# ifndef _LIBCPP_NO_ABI_TAG
# define _LIBCPP_HIDE_FROM_ABI \
_LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \
__attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE))))
# else
# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
# endif
# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
# ifdef _LIBCPP_BUILDING_LIBRARY
# if _LIBCPP_ABI_VERSION > 1
# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
# else
# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1
# endif
# else
# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
# endif
// TODO: Remove this workaround once we drop support for Clang 16
# if __has_warning("-Wc++23-extensions")
# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++23-extensions")
# else
# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++2b-extensions")
# endif
// Clang modules take a significant compile time hit when pushing and popping diagnostics.
// Since all the headers are marked as system headers in the modulemap, we can simply disable this
// pushing and popping when building with clang modules.
# if !__has_feature(modules)
# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \
_LIBCPP_DIAGNOSTIC_PUSH \
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++11-extensions") \
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION \
_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \
_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \
_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \
_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++23-extensions")
# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS _LIBCPP_DIAGNOSTIC_POP
# else
# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS
# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS
# endif
// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect.
// clang-format off
# define _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \
namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std { \
inline namespace _LIBCPP_ABI_NAMESPACE {
# define _LIBCPP_END_NAMESPACE_STD }} _LIBCPP_POP_EXTENSION_DIAGNOSTICS
#ifdef _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE
# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD namespace filesystem {
# define _LIBCPP_END_NAMESPACE_FILESYSTEM } _LIBCPP_END_NAMESPACE_STD
#else
# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD \
inline namespace __fs { namespace filesystem {
# define _LIBCPP_END_NAMESPACE_FILESYSTEM }} _LIBCPP_END_NAMESPACE_STD
#endif
// clang-format on
# if __has_attribute(__enable_if__)
# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, "")))
# endif
# if !defined(__SIZEOF_INT128__) || defined(_MSC_VER)
# define _LIBCPP_HAS_NO_INT128
# endif
# ifdef _LIBCPP_CXX03_LANG
# define _LIBCPP_DECLARE_STRONG_ENUM(x) \
struct _LIBCPP_EXPORTED_FROM_ABI x { \
enum __lx
// clang-format off
# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \
__lx __v_; \
_LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {} \
_LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
_LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; } \
};
// clang-format on
# else // _LIBCPP_CXX03_LANG
# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class x
# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
# endif // _LIBCPP_CXX03_LANG
# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__)
# define _LIBCPP_LOCALE__L_EXTENSIONS 1
# endif
# ifdef __FreeBSD__
# define _DECLARE_C99_LDBL_MATH 1
# endif
// If we are getting operator new from the MSVC CRT, then allocation overloads
// for align_val_t were added in 19.12, aka VS 2017 version 15.3.
# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new)
// We're deferring to Microsoft's STL to provide aligned new et al. We don't
// have it unless the language feature test macro is defined.
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
# elif defined(__MVS__)
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
# endif
# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)
# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
# endif
// It is not yet possible to use aligned_alloc() on all Apple platforms since
// 10.15 was the first version to ship an implementation of aligned_alloc().
# if defined(__APPLE__)
# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500)
# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC
# endif
# elif defined(__ANDROID__) && __ANDROID_API__ < 28
// Android only provides aligned_alloc when targeting API 28 or higher.
# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC
# endif
# if defined(__APPLE__) || defined(__FreeBSD__)
# define _LIBCPP_HAS_DEFAULTRUNELOCALE
# endif
# if defined(__APPLE__) || defined(__FreeBSD__)
# define _LIBCPP_WCTYPE_IS_MASK
# endif
# if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t)
# define _LIBCPP_HAS_NO_CHAR8_T
# endif
// Deprecation macros.
//
// Deprecations warnings are always enabled, except when users explicitly opt-out
// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.
# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
# if __has_attribute(__deprecated__)
# define _LIBCPP_DEPRECATED __attribute__((__deprecated__))
# define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m)))
# elif _LIBCPP_STD_VER >= 14
# define _LIBCPP_DEPRECATED [[deprecated]]
# define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]]
# else
# define _LIBCPP_DEPRECATED
# define _LIBCPP_DEPRECATED_(m)
# endif
# else
# define _LIBCPP_DEPRECATED
# define _LIBCPP_DEPRECATED_(m)
# endif
# if !defined(_LIBCPP_CXX03_LANG)
# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_IN_CXX11
# endif
# if _LIBCPP_STD_VER >= 14
# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_IN_CXX14
# endif
# if _LIBCPP_STD_VER >= 17
# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_IN_CXX17
# endif
# if _LIBCPP_STD_VER >= 20
# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_IN_CXX20
# endif
# if _LIBCPP_STD_VER >= 23
# define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_IN_CXX23
# endif
# if _LIBCPP_STD_VER >= 26
# define _LIBCPP_DEPRECATED_IN_CXX26 _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_IN_CXX26
# endif
# if !defined(_LIBCPP_HAS_NO_CHAR8_T)
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED
# else
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T
# endif
// Macros to enter and leave a state where deprecation warnings are suppressed.
# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \
_Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \
_Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop")
# else
# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH
# define _LIBCPP_SUPPRESS_DEPRECATED_POP
# endif
# if _LIBCPP_STD_VER <= 11
# define _LIBCPP_EXPLICIT_SINCE_CXX14
# else
# define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit
# endif
# if _LIBCPP_STD_VER >= 23
# define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit
# else
# define _LIBCPP_EXPLICIT_SINCE_CXX23
# endif
# if _LIBCPP_STD_VER >= 14
# define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr
# else
# define _LIBCPP_CONSTEXPR_SINCE_CXX14
# endif
# if _LIBCPP_STD_VER >= 17
# define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr
# else
# define _LIBCPP_CONSTEXPR_SINCE_CXX17
# endif
# if _LIBCPP_STD_VER >= 20
# define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr
# else
# define _LIBCPP_CONSTEXPR_SINCE_CXX20
# endif
# if _LIBCPP_STD_VER >= 23
# define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr
# else
# define _LIBCPP_CONSTEXPR_SINCE_CXX23
# endif
# if _LIBCPP_STD_VER >= 26
# define _LIBCPP_CONSTEXPR_SINCE_CXX26 constexpr
# else
# define _LIBCPP_CONSTEXPR_SINCE_CXX26
# endif
# ifndef _LIBCPP_WEAK
# define _LIBCPP_WEAK __attribute__((__weak__))
# endif
// Thread API
// clang-format off
# if !defined(_LIBCPP_HAS_NO_THREADS) && \
!defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \
!defined(_LIBCPP_HAS_THREAD_API_WIN32) && \
!defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
# if defined(__FreeBSD__) || \
defined(__wasi__) || \
defined(__NetBSD__) || \
defined(__OpenBSD__) || \
defined(__NuttX__) || \
defined(__linux__) || \
defined(__GNU__) || \
defined(__APPLE__) || \
defined(__MVS__) || \
defined(_AIX) || \
defined(__EMSCRIPTEN__)
// clang-format on
# define _LIBCPP_HAS_THREAD_API_PTHREAD
# elif defined(__Fuchsia__)
// TODO(44575): Switch to C11 thread API when possible.
# define _LIBCPP_HAS_THREAD_API_PTHREAD
# elif defined(_LIBCPP_WIN32API)
# define _LIBCPP_HAS_THREAD_API_WIN32
# else
# error "No thread API"
# endif // _LIBCPP_HAS_THREAD_API
# endif // _LIBCPP_HAS_NO_THREADS
# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
# if defined(__ANDROID__) && __ANDROID_API__ >= 30
# define _LIBCPP_HAS_COND_CLOCKWAIT
# elif defined(_LIBCPP_GLIBC_PREREQ)
# if _LIBCPP_GLIBC_PREREQ(2, 30)
# define _LIBCPP_HAS_COND_CLOCKWAIT
# endif
# endif
# endif
# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \
_LIBCPP_HAS_NO_THREADS is not defined.
# endif
# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \
_LIBCPP_HAS_NO_THREADS is defined.
# endif
# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS)
# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \
_LIBCPP_HAS_NO_THREADS is defined.
# endif
# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__)
# define __STDCPP_THREADS__ 1
# endif
// The glibc and Bionic implementation of pthreads implements
// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32
// mutexes have no destroy mechanism.
//
// This optimization can't be performed on Apple platforms, where
// pthread_mutex_destroy can allow the kernel to release resources.
// See https://llvm.org/D64298 for details.
//
// TODO(EricWF): Enable this optimization on Bionic after speaking to their
// respective stakeholders.
// clang-format off
# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \
(defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \
defined(_LIBCPP_HAS_THREAD_API_WIN32)
// clang-format on
# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION
# endif
// Destroying a condvar is a nop on Windows.
//
// This optimization can't be performed on Apple platforms, where
// pthread_cond_destroy can allow the kernel to release resources.
// See https://llvm.org/D64298 for details.
//
// TODO(EricWF): This is potentially true for some pthread implementations
// as well.
# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32)
# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
# endif
# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \
defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__) || defined(__LLVM_LIBC__)
# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
# endif
# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic)
# define _LIBCPP_HAS_C_ATOMIC_IMP
# elif defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_HAS_GCC_ATOMIC_IMP
# endif
# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \
!defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP)
# define _LIBCPP_HAS_NO_ATOMIC_HEADER
# else
# ifndef _LIBCPP_ATOMIC_FLAG_TYPE
# define _LIBCPP_ATOMIC_FLAG_TYPE bool
# endif
# endif
# if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(__no_thread_safety_analysis__)
# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((__no_thread_safety_analysis__))
# else
# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
# endif
# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS)
# if defined(__clang__) && __has_attribute(acquire_capability)
// Work around the attribute handling in clang. When both __declspec and
// __attribute__ are present, the processing goes awry preventing the definition
// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus
// combining the two does work.
# if !defined(_MSC_VER)
# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
# endif
# endif
# endif
# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x))
# else
# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x)
# endif
# if _LIBCPP_STD_VER >= 20
# define _LIBCPP_CONSTINIT constinit
# elif __has_attribute(__require_constant_initialization__)
# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__))
# else
# define _LIBCPP_CONSTINIT
# endif
# if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__)
// The CUDA SDK contains an unfortunate definition for the __noinline__ macro,
// which breaks the regular __attribute__((__noinline__)) syntax. Therefore,
// when compiling for CUDA we use the non-underscored version of the noinline
// attribute.
//
// This is a temporary workaround and we still expect the CUDA SDK team to solve
// this issue properly in the SDK headers.
//
// See https://github.com/llvm/llvm-project/pull/73838 for more details.
# define _LIBCPP_NOINLINE __attribute__((noinline))
# elif __has_attribute(__noinline__)
# define _LIBCPP_NOINLINE __attribute__((__noinline__))
# else
# define _LIBCPP_NOINLINE
# endif
// We often repeat things just for handling wide characters in the library.
// When wide characters are disabled, it can be useful to have a quick way of
// disabling it without having to resort to #if-#endif, which has a larger
// impact on readability.
# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
# define _LIBCPP_IF_WIDE_CHARACTERS(...)
# else
# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__
# endif
// clang-format off
# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")")
# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")")
// clang-format on
# ifndef _LIBCPP_NO_AUTO_LINK
# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# pragma comment(lib, "c++.lib")
# else
# pragma comment(lib, "libc++.lib")
# endif
# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
# endif // _LIBCPP_NO_AUTO_LINK
// Configures the fopen close-on-exec mode character, if any. This string will
// be appended to any mode string used by fstream for fopen/fdopen.
//
// Not all platforms support this, but it helps avoid fd-leaks on platforms that
// do.
# if defined(__BIONIC__)
# define _LIBCPP_FOPEN_CLOEXEC_MODE "e"
# else
# define _LIBCPP_FOPEN_CLOEXEC_MODE
# endif
# if __has_cpp_attribute(msvc::no_unique_address)
// MSVC implements [[no_unique_address]] as a silent no-op currently.
// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.)
// However, MSVC implements [[msvc::no_unique_address]] which does what
// [[no_unique_address]] is supposed to do, in general.
// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or
// [[msvc::no_unique_address]] though. If/when it does implement
// [[msvc::no_unique_address]], this should be preferred though.
# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
# elif __has_cpp_attribute(no_unique_address)
# define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]]
# else
# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */
// Note that this can be replaced by #error as soon as clang-cl
// implements msvc::no_unique_address, since there should be no C++20
// compiler that doesn't support one of the two attributes at that point.
// We generally don't want to use this macro outside of C++20-only code,
// because using it conditionally in one language version only would make
// the ABI inconsistent.
# endif
// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these
// functions is gradually being added to existing C libraries. The conditions
// below check for known C library versions and conditions under which these
// functions are declared by the C library.
# define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8
// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if
// __cpp_char8_t is defined or if C2X extensions are enabled. Determining
// the latter depends on internal GNU libc details that are not appropriate
// to depend on here, so any declarations present when __cpp_char8_t is not
// defined are ignored.
# if defined(_LIBCPP_GLIBC_PREREQ)
# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t)
# undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8
# endif
# endif
// There are a handful of public standard library types that are intended to
// support CTAD but don't need any explicit deduction guides to do so. This
// macro is used to mark them as such, which suppresses the
// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code
// with these classes.
# if _LIBCPP_STD_VER >= 17
# ifdef _LIBCPP_COMPILER_CLANG_BASED
# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) \
template <class... _Tag> \
[[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...>
# else
# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName) \
template <class... _Tag> \
ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...>
# endif
# else
# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")
# endif
// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use
// compiler intrinsics in the Objective-C++ mode.
# ifdef __OBJC__
# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS
# endif
# define _PSTL_PRAGMA(x) _Pragma(#x)
// Enable SIMD for compilers that support OpenMP 4.0
# if (defined(_OPENMP) && _OPENMP >= 201307)
# define _PSTL_UDR_PRESENT
# define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)
# define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)
# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))
# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))
# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))
# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))
// Declaration of reduction functor, where
// NAME - the name of the functor
// OP - type of the callable object with the reduction operation
// omp_in - refers to the local partial result
// omp_out - refers to the final value of the combiner operator
// omp_priv - refers to the private copy of the initial value
// omp_orig - refers to the original variable to be reduced
# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) \
_PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))
# elif defined(_LIBCPP_COMPILER_CLANG_BASED)
# define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)")
# define _PSTL_PRAGMA_DECLARE_SIMD
# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")
# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")
# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)
# else // (defined(_OPENMP) && _OPENMP >= 201307)
# define _PSTL_PRAGMA_SIMD
# define _PSTL_PRAGMA_DECLARE_SIMD
# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)
# define _PSTL_PRAGMA_SIMD_SCAN(PRM)
# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)
# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)
# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)
# endif // (defined(_OPENMP) && _OPENMP >= 201307)
# define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED
// Optional attributes - these are useful for a better QoI, but not required to be available
# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))
# else
# define _LIBCPP_NO_CFI
# endif
# if __has_attribute(__malloc__)
# define _LIBCPP_NOALIAS __attribute__((__malloc__))
# else
# define _LIBCPP_NOALIAS
# endif
# if __has_attribute(__using_if_exists__)
# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__))
# else
# define _LIBCPP_USING_IF_EXISTS
# endif
# if __has_cpp_attribute(__nodiscard__)
# define _LIBCPP_NODISCARD [[__nodiscard__]]
# else
// We can't use GCC's [[gnu::warn_unused_result]] and
// __attribute__((warn_unused_result)), because GCC does not silence them via
// (void) cast.
# define _LIBCPP_NODISCARD
# endif
# if __has_attribute(__no_destroy__)
# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__))
# else
# define _LIBCPP_NO_DESTROY
# endif
# if __has_attribute(__diagnose_if__)
# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning")))
# else
# define _LIBCPP_DIAGNOSE_WARNING(...)
# endif
// Use a function like macro to imply that it must be followed by a semicolon
# if __has_cpp_attribute(fallthrough)
# define _LIBCPP_FALLTHROUGH() [[fallthrough]]
# elif __has_attribute(__fallthrough__)
# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__))
# else
# define _LIBCPP_FALLTHROUGH() ((void)0)
# endif
# if __has_cpp_attribute(_Clang::__lifetimebound__)
# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]]
# else
# define _LIBCPP_LIFETIMEBOUND
# endif
# if __has_attribute(__nodebug__)
# define _LIBCPP_NODEBUG __attribute__((__nodebug__))
# else
# define _LIBCPP_NODEBUG
# endif
# if __has_attribute(__standalone_debug__)
# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__))
# else
# define _LIBCPP_STANDALONE_DEBUG
# endif
# if __has_attribute(__preferred_name__)
# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x)))
# else
# define _LIBCPP_PREFERRED_NAME(x)
# endif
# if __has_attribute(__no_sanitize__)
# define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__)))
# else
# define _LIBCPP_NO_SANITIZE(...)
# endif
# if __has_attribute(__init_priority__)
# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100)))
# else
# define _LIBCPP_INIT_PRIORITY_MAX
# endif
# if __has_attribute(__format__)
// The attribute uses 1-based indices for ordinary and static member functions.
// The attribute uses 2-based indices for non-static member functions.
# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \
__attribute__((__format__(archetype, format_string_index, first_format_arg_index)))
# else
# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */
# endif
# if __has_attribute(__packed__)
# define _LIBCPP_PACKED __attribute__((__packed__))
# else
# define _LIBCPP_PACKED
# endif
# if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases)
# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases)
# else
# define _LIBCPP_DECLSPEC_EMPTY_BASES
# endif
// Allow for build-time disabling of unsigned integer sanitization
# if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
# else
# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
# endif
// Clang-18 has support for deducing this, but it does not set the FTM.
# if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800)
# define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER
# endif
#endif // __cplusplus
#endif // _LIBCPP___CONFIG
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