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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___CXX03___CONFIG11#define _LIBCPP___CXX03___CONFIG12 13#include <__cxx03/__configuration/abi.h>14#include <__cxx03/__configuration/availability.h>15#include <__cxx03/__configuration/compiler.h>16#include <__cxx03/__configuration/config_site_shim.h>17#include <__cxx03/__configuration/platform.h>18 19#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER20# pragma GCC system_header21#endif22 23#ifdef __cplusplus24 25// The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html26 27// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.28// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is29// defined to XXYYZZ.30# define _LIBCPP_VERSION 19010031 32# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y33# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)34 35# if __STDC_HOSTED__ == 036# define _LIBCPP_FREESTANDING37# endif38 39// HARDENING {40 41// This is for backward compatibility -- make enabling `_LIBCPP_ENABLE_ASSERTIONS` (which predates hardening modes)42// equivalent to setting the extensive mode. This is deprecated and will be removed in LLVM 20.43# ifdef _LIBCPP_ENABLE_ASSERTIONS44# warning "_LIBCPP_ENABLE_ASSERTIONS is deprecated, please use _LIBCPP_HARDENING_MODE instead"45# if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 146# error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1"47# endif48# if _LIBCPP_ENABLE_ASSERTIONS49# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_EXTENSIVE50# endif51# endif52 53// The library provides the macro `_LIBCPP_HARDENING_MODE` which can be set to one of the following values:54//55// - `_LIBCPP_HARDENING_MODE_NONE`;56// - `_LIBCPP_HARDENING_MODE_FAST`;57// - `_LIBCPP_HARDENING_MODE_EXTENSIVE`;58// - `_LIBCPP_HARDENING_MODE_DEBUG`.59//60// These values have the following effects:61//62// - `_LIBCPP_HARDENING_MODE_NONE` -- sets the hardening mode to "none" which disables all runtime hardening checks;63//64// - `_LIBCPP_HARDENING_MODE_FAST` -- sets that hardening mode to "fast". The fast mode enables security-critical checks65// that can be done with relatively little runtime overhead in constant time;66//67// - `_LIBCPP_HARDENING_MODE_EXTENSIVE` -- sets the hardening mode to "extensive". The extensive mode is a superset of68// the fast mode that additionally enables checks that are relatively cheap and prevent common types of logic errors69// but are not necessarily security-critical;70//71// - `_LIBCPP_HARDENING_MODE_DEBUG` -- sets the hardening mode to "debug". The debug mode is a superset of the extensive72// mode and enables all checks available in the library, including internal assertions. Checks that are part of the73// debug mode can be very expensive and thus the debug mode is intended to be used for testing, not in production.74 75// Inside the library, assertions are categorized so they can be cherry-picked based on the chosen hardening mode. These76// macros are only for internal use -- users should only pick one of the high-level hardening modes described above.77//78// - `_LIBCPP_ASSERT_VALID_INPUT_RANGE` -- checks that ranges (whether expressed as an iterator pair, an iterator and79// a sentinel, an iterator and a count, or a `std::range`) given as input to library functions are valid:80// - the sentinel is reachable from the begin iterator;81// - TODO(hardening): both iterators refer to the same container.82//83// - `_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS` -- checks that any attempts to access a container element, whether through84// the container object or through an iterator, are valid and do not attempt to go out of bounds or otherwise access85// a non-existent element. For iterator checks to work, bounded iterators must be enabled in the ABI. Types like86// `optional` and `function` are considered one-element containers for the purposes of this check.87//88// - `_LIBCPP_ASSERT_NON_NULL` -- checks that the pointer being dereferenced is not null. On most modern platforms zero89// address does not refer to an actual location in memory, so a null pointer dereference would not compromize the90// memory security of a program (however, it is still undefined behavior that can result in strange errors due to91// compiler optimizations).92//93// - `_LIBCPP_ASSERT_NON_OVERLAPPING_RANGES` -- for functions that take several ranges as arguments, checks that the94// given ranges do not overlap.95//96// - `_LIBCPP_ASSERT_VALID_DEALLOCATION` -- checks that an attempt to deallocate memory is valid (e.g. the given object97// was allocated by the given allocator). Violating this category typically results in a memory leak.98//99// - `_LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL` -- checks that a call to an external API doesn't fail in100// an unexpected manner. This includes triggering documented cases of undefined behavior in an external library (like101// attempting to unlock an unlocked mutex in pthreads). Any API external to the library falls under this category102// (from system calls to compiler intrinsics). We generally don't expect these failures to compromize memory safety or103// otherwise create an immediate security issue.104//105// - `_LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR` -- checks any operations that exchange nodes between containers to make sure106// the containers have compatible allocators.107//108// - `_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN` -- checks that the given argument is within the domain of valid arguments109// for the function. Violating this typically produces an incorrect result (e.g. the clamp algorithm returns the110// original value without clamping it due to incorrect functors) or puts an object into an invalid state (e.g.111// a string view where only a subset of elements is possible to access). This category is for assertions violating112// which doesn't cause any immediate issues in the library -- whatever the consequences are, they will happen in the113// user code.114//115// - `_LIBCPP_ASSERT_PEDANTIC` -- checks prerequisites which are imposed by the Standard, but violating which happens to116// be benign in our implementation.117//118// - `_LIBCPP_ASSERT_SEMANTIC_REQUIREMENT` -- checks that the given argument satisfies the semantic requirements imposed119// by the Standard. Typically, there is no simple way to completely prove that a semantic requirement is satisfied;120// thus, this would often be a heuristic check and it might be quite expensive.121//122// - `_LIBCPP_ASSERT_INTERNAL` -- checks that internal invariants of the library hold. These assertions don't depend on123// user input.124//125// - `_LIBCPP_ASSERT_UNCATEGORIZED` -- for assertions that haven't been properly classified yet.126 127// clang-format off128# define _LIBCPP_HARDENING_MODE_NONE (1 << 1)129# define _LIBCPP_HARDENING_MODE_FAST (1 << 2)130# define _LIBCPP_HARDENING_MODE_EXTENSIVE (1 << 4) // Deliberately not ordered.131# define _LIBCPP_HARDENING_MODE_DEBUG (1 << 3)132// clang-format on133 134# ifndef _LIBCPP_HARDENING_MODE135 136# ifndef _LIBCPP_HARDENING_MODE_DEFAULT137# error _LIBCPP_HARDENING_MODE_DEFAULT is not defined. This definition should be set at configuration time in the \138`__config_site` header, please make sure your installation of libc++ is not broken.139# endif140 141# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_DEFAULT142# endif143 144# if _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_NONE && \145 _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_FAST && \146 _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_EXTENSIVE && \147 _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_DEBUG148# error _LIBCPP_HARDENING_MODE must be set to one of the following values: \149_LIBCPP_HARDENING_MODE_NONE, \150_LIBCPP_HARDENING_MODE_FAST, \151_LIBCPP_HARDENING_MODE_EXTENSIVE, \152_LIBCPP_HARDENING_MODE_DEBUG153# endif154 155# ifdef _LIBCPP_ASSERTION_SEMANTIC156# error "Assertion semantics are not available in the C++03 mode."157# endif158 159// } HARDENING160 161# define _LIBCPP_TOSTRING2(x) #x162# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)163 164# ifndef __has_constexpr_builtin165# define __has_constexpr_builtin(x) 0166# endif167 168// This checks wheter a Clang module is built169# ifndef __building_module170# define __building_module(...) 0171# endif172 173// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by174// the compiler and '1' otherwise.175# ifndef __is_identifier176# define __is_identifier(__x) 1177# endif178 179# ifndef __has_declspec_attribute180# define __has_declspec_attribute(__x) 0181# endif182 183# define __has_keyword(__x) !(__is_identifier(__x))184 185# ifndef __has_warning186# define __has_warning(...) 0187# endif188 189# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L190# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11"191# endif192 193// FIXME: ABI detection should be done via compiler builtin macros. This194// is just a placeholder until Clang implements such macros. For now assume195// that Windows compilers pretending to be MSVC++ target the Microsoft ABI,196// and allow the user to explicitly specify the ABI to handle cases where this197// heuristic falls short.198# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT)199# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined"200# elif defined(_LIBCPP_ABI_FORCE_ITANIUM)201# define _LIBCPP_ABI_ITANIUM202# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT)203# define _LIBCPP_ABI_MICROSOFT204# else205# if defined(_WIN32) && defined(_MSC_VER)206# define _LIBCPP_ABI_MICROSOFT207# else208# define _LIBCPP_ABI_ITANIUM209# endif210# endif211 212# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)213# define _LIBCPP_ABI_VCRUNTIME214# endif215 216# if __has_feature(experimental_library)217# ifndef _LIBCPP_ENABLE_EXPERIMENTAL218# define _LIBCPP_ENABLE_EXPERIMENTAL219# endif220# endif221 222# if defined(__MVS__)223# include <features.h> // for __NATIVE_ASCII_F224# endif225 226# if defined(_WIN32)227# define _LIBCPP_WIN32API228# define _LIBCPP_SHORT_WCHAR 1229// Both MinGW and native MSVC provide a "MSVC"-like environment230# define _LIBCPP_MSVCRT_LIKE231// If mingw not explicitly detected, assume using MS C runtime only if232// a MS compatibility version is specified.233# if defined(_MSC_VER) && !defined(__MINGW32__)234# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library235# endif236# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__))237# define _LIBCPP_HAS_BITSCAN64238# endif239# define _LIBCPP_HAS_OPEN_WITH_WCHAR240# endif // defined(_WIN32)241 242# if defined(_AIX) && !defined(__64BIT__)243// The size of wchar is 2 byte on 32-bit mode on AIX.244# define _LIBCPP_SHORT_WCHAR 1245# endif246 247// Libc++ supports various implementations of std::random_device.248//249// _LIBCPP_USING_DEV_RANDOM250// Read entropy from the given file, by default `/dev/urandom`.251// If a token is provided, it is assumed to be the path to a file252// to read entropy from. This is the default behavior if nothing253// else is specified. This implementation requires storing state254// inside `std::random_device`.255//256// _LIBCPP_USING_ARC4_RANDOM257// Use arc4random(). This allows obtaining random data even when258// using sandboxing mechanisms. On some platforms like Apple, this259// is the recommended source of entropy for user-space programs.260// When this option is used, the token passed to `std::random_device`'s261// constructor *must* be "/dev/urandom" -- anything else is an error.262//263// _LIBCPP_USING_GETENTROPY264// Use getentropy().265// When this option is used, the token passed to `std::random_device`'s266// constructor *must* be "/dev/urandom" -- anything else is an error.267//268// _LIBCPP_USING_FUCHSIA_CPRNG269// Use Fuchsia's zx_cprng_draw() system call, which is specified to270// deliver high-quality entropy and cannot fail.271// When this option is used, the token passed to `std::random_device`'s272// constructor *must* be "/dev/urandom" -- anything else is an error.273//274// _LIBCPP_USING_NACL_RANDOM275// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access,276// including accesses to the special files under `/dev`. This implementation277// uses the NaCL syscall `nacl_secure_random_init()` to get entropy.278// When this option is used, the token passed to `std::random_device`'s279// constructor *must* be "/dev/urandom" -- anything else is an error.280//281// _LIBCPP_USING_WIN32_RANDOM282// Use rand_s(), for use on Windows.283// When this option is used, the token passed to `std::random_device`'s284// constructor *must* be "/dev/urandom" -- anything else is an error.285# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \286 defined(__DragonFly__)287# define _LIBCPP_USING_ARC4_RANDOM288# elif defined(__wasi__) || defined(__EMSCRIPTEN__)289# define _LIBCPP_USING_GETENTROPY290# elif defined(__Fuchsia__)291# define _LIBCPP_USING_FUCHSIA_CPRNG292# elif defined(__native_client__)293# define _LIBCPP_USING_NACL_RANDOM294# elif defined(_LIBCPP_WIN32API)295# define _LIBCPP_USING_WIN32_RANDOM296# else297# define _LIBCPP_USING_DEV_RANDOM298# endif299 300# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)301# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))302# define _ALIGNAS(x) __attribute__((__aligned__(x)))303# define _LIBCPP_NORETURN __attribute__((__noreturn__))304# define nullptr __nullptr305# define _NOEXCEPT throw()306# define static_assert(...) _Static_assert(__VA_ARGS__)307# define decltype(...) __decltype(__VA_ARGS__)308 309typedef __char16_t char16_t;310typedef __char32_t char32_t;311 312# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)313 314// Objective-C++ features (opt-in)315# if __has_feature(objc_arc)316# define _LIBCPP_HAS_OBJC_ARC317# endif318 319# if __has_feature(objc_arc_weak)320# define _LIBCPP_HAS_OBJC_ARC_WEAK321# endif322 323# if __has_extension(blocks)324# define _LIBCPP_HAS_EXTENSION_BLOCKS325# endif326 327# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__)328# define _LIBCPP_HAS_BLOCKS_RUNTIME329# endif330 331# if !__has_feature(address_sanitizer)332# define _LIBCPP_HAS_NO_ASAN333# endif334 335# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__))336 337# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__338 339# if defined(_LIBCPP_OBJECT_FORMAT_COFF)340 341# ifdef _DLL342# define _LIBCPP_CRT_FUNC __declspec(dllimport)343# else344# define _LIBCPP_CRT_FUNC345# endif346 347# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY))348# define _LIBCPP_DLL_VIS349# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS350# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS351# define _LIBCPP_OVERRIDABLE_FUNC_VIS352# define _LIBCPP_EXPORTED_FROM_ABI353# elif defined(_LIBCPP_BUILDING_LIBRARY)354# define _LIBCPP_DLL_VIS __declspec(dllexport)355# if defined(__MINGW32__)356# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS357# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS358# else359# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS360# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS361# endif362# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS363# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport)364# else365# define _LIBCPP_DLL_VIS __declspec(dllimport)366# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS367# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS368# define _LIBCPP_OVERRIDABLE_FUNC_VIS369# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport)370# endif371 372# define _LIBCPP_HIDDEN373# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS374# define _LIBCPP_TEMPLATE_VIS375# define _LIBCPP_TEMPLATE_DATA_VIS376# define _LIBCPP_TYPE_VISIBILITY_DEFAULT377 378# else379 380# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)381# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis)))382# else383# define _LIBCPP_VISIBILITY(vis)384# endif385 386# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden")387# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default")388# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default")389# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default")390# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS391 392// TODO: Make this a proper customization point or remove the option to override it.393# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS394# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default")395# endif396 397# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)398// The inline should be removed once PR32114 is resolved399# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN400# else401# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS402# endif403 404// GCC doesn't support the type_visibility attribute, so we have to keep the visibility attribute on templates405# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && !__has_attribute(__type_visibility__)406# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default")))407# else408# define _LIBCPP_TEMPLATE_VIS409# endif410 411# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)412# define _LIBCPP_TYPE_VISIBILITY_DEFAULT __attribute__((__type_visibility__("default")))413# else414# define _LIBCPP_TYPE_VISIBILITY_DEFAULT415# endif416 417# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF)418 419# if __has_attribute(exclude_from_explicit_instantiation)420# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__))421# else422// Try to approximate the effect of exclude_from_explicit_instantiation423// (which is that entities are not assumed to be provided by explicit424// template instantiations in the dylib) by always inlining those entities.425# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE426# endif427 428# ifdef _LIBCPP_COMPILER_CLANG_BASED429# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push")430# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop")431# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str))432# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str)433# elif defined(_LIBCPP_COMPILER_GCC)434# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push")435# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop")436# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str)437# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str))438# else439# define _LIBCPP_DIAGNOSTIC_PUSH440# define _LIBCPP_DIAGNOSTIC_POP441# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str)442# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str)443# endif444 445# if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST446# define _LIBCPP_HARDENING_SIG f447# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE448# define _LIBCPP_HARDENING_SIG s449# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG450# define _LIBCPP_HARDENING_SIG d451# else452# define _LIBCPP_HARDENING_SIG n // "none"453# endif454 455# ifdef _LIBCPP_HAS_NO_EXCEPTIONS456# define _LIBCPP_EXCEPTIONS_SIG n457# else458# define _LIBCPP_EXCEPTIONS_SIG e459# endif460 461# define _LIBCPP_ODR_SIGNATURE \462 _LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION)463 464// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved465// on two levels:466// 1. The symbol is given hidden visibility, which ensures that users won't start exporting467// symbols from their dynamic library by means of using the libc++ headers. This ensures468// that those symbols stay private to the dynamic library in which it is defined.469//470// 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library.471// This ensures that no ODR violation can arise from mixing two TUs compiled with different472// versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the473// program contains two definitions of a function, the ODR requires them to be token-by-token474// equivalent, and the linker is allowed to pick either definition and discard the other one.475//476// For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled477// *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs478// compiled with different settings), the two definitions are both visible by the linker and they479// have the same name, but they have a meaningfully different implementation (one throws an exception480// and the other aborts the program). This violates the ODR and makes the program ill-formed, and in481// practice what will happen is that the linker will pick one of the definitions at random and will482// discard the other one. This can quite clearly lead to incorrect program behavior.483//484// A similar reasoning holds for many other properties that are ODR-affecting. Essentially any485// property that causes the code of a function to differ from the code in another configuration486// can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI487// tag, but we encode the ones that we think are most important: library version, exceptions, and488// hardening mode.489//490// Note that historically, solving this problem has been achieved in various ways, including491// force-inlining all functions or giving internal linkage to all functions. Both these previous492// solutions suffer from drawbacks that lead notably to code bloat.493//494// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend495// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library.496//497// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions498// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled499// name of a virtual function is part of its ABI, since some architectures like arm64e can sign500// the virtual function pointer in the vtable based on the mangled name of the function. Since501// we use an ABI tag that changes with each released version, the mangled name of the virtual502// function would change, which is incorrect. Note that it doesn't make much sense to change503// the implementation of a virtual function in an ABI-incompatible way in the first place,504// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable.505//506// The macro can be applied to record and enum types. When the tagged type is nested in507// a record this "parent" record needs to have the macro too. Another use case for applying508// this macro to records and unions is to apply an ABI tag to inline constexpr variables.509// This can be useful for inline variables that are implementation details which are expected510// to change in the future.511//512// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing513// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and514// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70.515# ifndef _LIBCPP_NO_ABI_TAG516# define _LIBCPP_HIDE_FROM_ABI \517 _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \518 __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE))))519# else520# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION521# endif522# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION523 524# ifdef _LIBCPP_BUILDING_LIBRARY525# if _LIBCPP_ABI_VERSION > 1526# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI527# else528# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1529# endif530# else531# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI532# endif533 534// TODO: Remove this workaround once we drop support for Clang 16535# if __has_warning("-Wc++23-extensions")536# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++23-extensions")537# else538# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++2b-extensions")539# endif540 541// Clang modules take a significant compile time hit when pushing and popping diagnostics.542// Since all the headers are marked as system headers in the modulemap, we can simply disable this543// pushing and popping when building with clang modules.544# if !__has_feature(modules)545# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \546 _LIBCPP_DIAGNOSTIC_PUSH \547 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++11-extensions") \548 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \549 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \550 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \551 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION \552 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \553 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \554 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \555 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++23-extensions")556# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS _LIBCPP_DIAGNOSTIC_POP557# else558# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS559# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS560# endif561 562// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect.563// clang-format off564# define _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \565 namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std { \566 inline namespace _LIBCPP_ABI_NAMESPACE {567# define _LIBCPP_END_NAMESPACE_STD }} _LIBCPP_POP_EXTENSION_DIAGNOSTICS568 569#ifdef _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE570# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD namespace filesystem {571# define _LIBCPP_END_NAMESPACE_FILESYSTEM } _LIBCPP_END_NAMESPACE_STD572#else573# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD \574 inline namespace __fs { namespace filesystem {575 576# define _LIBCPP_END_NAMESPACE_FILESYSTEM }} _LIBCPP_END_NAMESPACE_STD577#endif578 579// clang-format on580 581# if __has_attribute(__enable_if__)582# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, "")))583# endif584 585# if !defined(__SIZEOF_INT128__) || defined(_MSC_VER)586# define _LIBCPP_HAS_NO_INT128587# endif588 589# define _LIBCPP_DECLARE_STRONG_ENUM(x) \590 struct _LIBCPP_EXPORTED_FROM_ABI x { \591 enum __lx592// clang-format off593# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \594 __lx __v_; \595 _LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {} \596 _LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \597 _LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; } \598 };599// clang-format on600 601# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__)602# define _LIBCPP_LOCALE__L_EXTENSIONS 1603# endif604 605# ifdef __FreeBSD__606# define _DECLARE_C99_LDBL_MATH 1607# endif608 609// If we are getting operator new from the MSVC CRT, then allocation overloads610// for align_val_t were added in 19.12, aka VS 2017 version 15.3.611# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912612# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION613# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new)614// We're deferring to Microsoft's STL to provide aligned new et al. We don't615// have it unless the language feature test macro is defined.616# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION617# elif defined(__MVS__)618# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION619# endif620 621# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)622# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION623# endif624 625# if defined(__APPLE__) || defined(__FreeBSD__)626# define _LIBCPP_HAS_DEFAULTRUNELOCALE627# endif628 629# if defined(__APPLE__) || defined(__FreeBSD__)630# define _LIBCPP_WCTYPE_IS_MASK631# endif632 633# define _LIBCPP_HAS_NO_CHAR8_T634 635// Deprecation macros.636//637// Deprecations warnings are always enabled, except when users explicitly opt-out638// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.639# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)640# define _LIBCPP_DEPRECATED __attribute__((__deprecated__))641# define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m)))642# else643# define _LIBCPP_DEPRECATED644# define _LIBCPP_DEPRECATED_(m)645# endif646 647# define _LIBCPP_DEPRECATED_ATOMIC_SYNC /* nothing */648 649# if !defined(_LIBCPP_HAS_NO_CHAR8_T)650# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED651# else652# define _LIBCPP_DEPRECATED_WITH_CHAR8_T653# endif654 655// Macros to enter and leave a state where deprecation warnings are suppressed.656# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC)657# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \658 _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \659 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")660# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop")661# else662# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH663# define _LIBCPP_SUPPRESS_DEPRECATED_POP664# endif665 666# ifndef _LIBCPP_WEAK667# define _LIBCPP_WEAK __attribute__((__weak__))668# endif669 670// Thread API671// clang-format off672# if !defined(_LIBCPP_HAS_NO_THREADS) && \673 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \674 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \675 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)676 677# if defined(__FreeBSD__) || \678 defined(__wasi__) || \679 defined(__NetBSD__) || \680 defined(__OpenBSD__) || \681 defined(__NuttX__) || \682 defined(__linux__) || \683 defined(__GNU__) || \684 defined(__APPLE__) || \685 defined(__MVS__) || \686 defined(_AIX) || \687 defined(__EMSCRIPTEN__)688// clang-format on689# define _LIBCPP_HAS_THREAD_API_PTHREAD690# elif defined(__Fuchsia__)691// TODO(44575): Switch to C11 thread API when possible.692# define _LIBCPP_HAS_THREAD_API_PTHREAD693# elif defined(_LIBCPP_WIN32API)694# define _LIBCPP_HAS_THREAD_API_WIN32695# else696# error "No thread API"697# endif // _LIBCPP_HAS_THREAD_API698# endif // _LIBCPP_HAS_NO_THREADS699 700# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)701# if defined(__ANDROID__) && __ANDROID_API__ >= 30702# define _LIBCPP_HAS_COND_CLOCKWAIT703# elif defined(_LIBCPP_GLIBC_PREREQ)704# if _LIBCPP_GLIBC_PREREQ(2, 30)705# define _LIBCPP_HAS_COND_CLOCKWAIT706# endif707# endif708# endif709 710# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD)711# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \712 _LIBCPP_HAS_NO_THREADS is not defined.713# endif714 715# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)716# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \717 _LIBCPP_HAS_NO_THREADS is defined.718# endif719 720# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS)721# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \722 _LIBCPP_HAS_NO_THREADS is defined.723# endif724 725# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__)726# define __STDCPP_THREADS__ 1727# endif728 729// The glibc and Bionic implementation of pthreads implements730// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32731// mutexes have no destroy mechanism.732//733// This optimization can't be performed on Apple platforms, where734// pthread_mutex_destroy can allow the kernel to release resources.735// See https://llvm.org/D64298 for details.736//737// TODO(EricWF): Enable this optimization on Bionic after speaking to their738// respective stakeholders.739// clang-format off740# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \741 (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \742 defined(_LIBCPP_HAS_THREAD_API_WIN32)743// clang-format on744# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION745# endif746 747// Destroying a condvar is a nop on Windows.748//749// This optimization can't be performed on Apple platforms, where750// pthread_cond_destroy can allow the kernel to release resources.751// See https://llvm.org/D64298 for details.752//753// TODO(EricWF): This is potentially true for some pthread implementations754// as well.755# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32)756# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION757# endif758 759# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \760 defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__)761# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE762# endif763 764# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic)765# define _LIBCPP_HAS_C_ATOMIC_IMP766# elif defined(_LIBCPP_COMPILER_GCC)767# define _LIBCPP_HAS_GCC_ATOMIC_IMP768# endif769 770# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \771 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP)772# define _LIBCPP_HAS_NO_ATOMIC_HEADER773# else774# ifndef _LIBCPP_ATOMIC_FLAG_TYPE775# define _LIBCPP_ATOMIC_FLAG_TYPE bool776# endif777# endif778 779# if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(__no_thread_safety_analysis__)780# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((__no_thread_safety_analysis__))781# else782# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS783# endif784 785# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS)786# if defined(__clang__) && __has_attribute(acquire_capability)787// Work around the attribute handling in clang. When both __declspec and788// __attribute__ are present, the processing goes awry preventing the definition789// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus790// combining the two does work.791# if !defined(_MSC_VER)792# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS793# endif794# endif795# endif796 797# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS798# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x))799# else800# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x)801# endif802 803# if __has_attribute(__require_constant_initialization__)804# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__))805# else806# define _LIBCPP_CONSTINIT807# endif808 809# if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__)810// The CUDA SDK contains an unfortunate definition for the __noinline__ macro,811// which breaks the regular __attribute__((__noinline__)) syntax. Therefore,812// when compiling for CUDA we use the non-underscored version of the noinline813// attribute.814//815// This is a temporary workaround and we still expect the CUDA SDK team to solve816// this issue properly in the SDK headers.817//818// See https://github.com/llvm/llvm-project/pull/73838 for more details.819# define _LIBCPP_NOINLINE __attribute__((noinline))820# elif __has_attribute(__noinline__)821# define _LIBCPP_NOINLINE __attribute__((__noinline__))822# else823# define _LIBCPP_NOINLINE824# endif825 826// We often repeat things just for handling wide characters in the library.827// When wide characters are disabled, it can be useful to have a quick way of828// disabling it without having to resort to #if-#endif, which has a larger829// impact on readability.830# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)831# define _LIBCPP_IF_WIDE_CHARACTERS(...)832# else833# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__834# endif835 836// clang-format off837# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")")838# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")")839// clang-format on840 841# ifndef _LIBCPP_NO_AUTO_LINK842# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)843# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)844# pragma comment(lib, "c++.lib")845# else846# pragma comment(lib, "libc++.lib")847# endif848# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)849# endif // _LIBCPP_NO_AUTO_LINK850 851// Configures the fopen close-on-exec mode character, if any. This string will852// be appended to any mode string used by fstream for fopen/fdopen.853//854// Not all platforms support this, but it helps avoid fd-leaks on platforms that855// do.856# if defined(__BIONIC__)857# define _LIBCPP_FOPEN_CLOEXEC_MODE "e"858# else859# define _LIBCPP_FOPEN_CLOEXEC_MODE860# endif861 862# if __has_cpp_attribute(msvc::no_unique_address)863// MSVC implements [[no_unique_address]] as a silent no-op currently.864// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.)865// However, MSVC implements [[msvc::no_unique_address]] which does what866// [[no_unique_address]] is supposed to do, in general.867 868// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or869// [[msvc::no_unique_address]] though. If/when it does implement870// [[msvc::no_unique_address]], this should be preferred though.871# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]872# elif __has_cpp_attribute(no_unique_address)873# define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]]874# else875# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */876// Note that this can be replaced by #error as soon as clang-cl877// implements msvc::no_unique_address, since there should be no C++20878// compiler that doesn't support one of the two attributes at that point.879// We generally don't want to use this macro outside of C++20-only code,880// because using it conditionally in one language version only would make881// the ABI inconsistent.882# endif883 884// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these885// functions is gradually being added to existing C libraries. The conditions886// below check for known C library versions and conditions under which these887// functions are declared by the C library.888# define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8889// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if890// __cpp_char8_t is defined or if C2X extensions are enabled. Determining891// the latter depends on internal GNU libc details that are not appropriate892// to depend on here, so any declarations present when __cpp_char8_t is not893// defined are ignored.894# if defined(_LIBCPP_GLIBC_PREREQ)895# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t)896# undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8897# endif898# endif899 900// There are a handful of public standard library types that are intended to901// support CTAD but don't need any explicit deduction guides to do so. This902// macro is used to mark them as such, which suppresses the903// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code904// with these classes.905# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "")906 907// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use908// compiler intrinsics in the Objective-C++ mode.909# ifdef __OBJC__910# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS911# endif912 913# define _PSTL_PRAGMA(x) _Pragma(#x)914 915// Enable SIMD for compilers that support OpenMP 4.0916# if (defined(_OPENMP) && _OPENMP >= 201307)917 918# define _PSTL_UDR_PRESENT919# define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd)920# define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd)921# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM))922# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM))923# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM))924# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM))925 926// Declaration of reduction functor, where927// NAME - the name of the functor928// OP - type of the callable object with the reduction operation929// omp_in - refers to the local partial result930// omp_out - refers to the final value of the combiner operator931// omp_priv - refers to the private copy of the initial value932// omp_orig - refers to the original variable to be reduced933# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) \934 _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig))935 936# elif defined(_LIBCPP_COMPILER_CLANG_BASED)937 938# define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)")939# define _PSTL_PRAGMA_DECLARE_SIMD940# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")941# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)")942# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)943# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)944# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)945 946# else // (defined(_OPENMP) && _OPENMP >= 201307)947 948# define _PSTL_PRAGMA_SIMD949# define _PSTL_PRAGMA_DECLARE_SIMD950# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM)951# define _PSTL_PRAGMA_SIMD_SCAN(PRM)952# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM)953# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM)954# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP)955 956# endif // (defined(_OPENMP) && _OPENMP >= 201307)957 958# define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED959 960// Optional attributes - these are useful for a better QoI, but not required to be available961 962# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)963# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))964# else965# define _LIBCPP_NO_CFI966# endif967 968# if __has_attribute(__malloc__)969# define _LIBCPP_NOALIAS __attribute__((__malloc__))970# else971# define _LIBCPP_NOALIAS972# endif973 974# if __has_attribute(__using_if_exists__)975# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__))976# else977# define _LIBCPP_USING_IF_EXISTS978# endif979 980# if __has_cpp_attribute(__nodiscard__)981# define _LIBCPP_NODISCARD [[__nodiscard__]]982# else983// We can't use GCC's [[gnu::warn_unused_result]] and984// __attribute__((warn_unused_result)), because GCC does not silence them via985// (void) cast.986# define _LIBCPP_NODISCARD987# endif988 989# if __has_attribute(__no_destroy__)990# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__))991# else992# define _LIBCPP_NO_DESTROY993# endif994 995# if __has_attribute(__diagnose_if__)996# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning")))997# else998# define _LIBCPP_DIAGNOSE_WARNING(...)999# endif1000 1001// Use a function like macro to imply that it must be followed by a semicolon1002# if __has_cpp_attribute(fallthrough)1003# define _LIBCPP_FALLTHROUGH() [[fallthrough]]1004# elif __has_attribute(__fallthrough__)1005# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__))1006# else1007# define _LIBCPP_FALLTHROUGH() ((void)0)1008# endif1009 1010# if __has_cpp_attribute(_Clang::__lifetimebound__)1011# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]]1012# else1013# define _LIBCPP_LIFETIMEBOUND1014# endif1015 1016# if __has_attribute(__nodebug__)1017# define _LIBCPP_NODEBUG __attribute__((__nodebug__))1018# else1019# define _LIBCPP_NODEBUG1020# endif1021 1022# if __has_attribute(__standalone_debug__)1023# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__))1024# else1025# define _LIBCPP_STANDALONE_DEBUG1026# endif1027 1028# if __has_attribute(__preferred_name__)1029# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x)))1030# else1031# define _LIBCPP_PREFERRED_NAME(x)1032# endif1033 1034# if __has_attribute(__no_sanitize__)1035# define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__)))1036# else1037# define _LIBCPP_NO_SANITIZE(...)1038# endif1039 1040# if __has_attribute(__init_priority__)1041# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100)))1042# else1043# define _LIBCPP_INIT_PRIORITY_MAX1044# endif1045 1046# if __has_attribute(__format__)1047// The attribute uses 1-based indices for ordinary and static member functions.1048// The attribute uses 2-based indices for non-static member functions.1049# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \1050 __attribute__((__format__(archetype, format_string_index, first_format_arg_index)))1051# else1052# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */1053# endif1054 1055# if __has_attribute(__packed__)1056# define _LIBCPP_PACKED __attribute__((__packed__))1057# else1058# define _LIBCPP_PACKED1059# endif1060 1061# if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases)1062# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases)1063# else1064# define _LIBCPP_DECLSPEC_EMPTY_BASES1065# endif1066 1067// Allow for build-time disabling of unsigned integer sanitization1068# if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC)1069# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))1070# else1071# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK1072# endif1073 1074// Clang-18 has support for deducing this, but it does not set the FTM.1075# if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800)1076# define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER1077# endif1078 1079#endif // __cplusplus1080 1081#endif // _LIBCPP___CXX03___CONFIG1082