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-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP___CXX03___CONFIG 11#define _LIBCPP___CXX03___CONFIG 12 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_HEADER 20# pragma GCC system_header 21#endif 22 23#ifdef __cplusplus 24 25// The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html 26 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 is 29// defined to XXYYZZ. 30# define _LIBCPP_VERSION 190100 31 32# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y 33# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y) 34 35# if __STDC_HOSTED__ == 0 36# define _LIBCPP_FREESTANDING 37# endif 38 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_ASSERTIONS 44# warning "_LIBCPP_ENABLE_ASSERTIONS is deprecated, please use _LIBCPP_HARDENING_MODE instead" 45# if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 1 46# error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1" 47# endif 48# if _LIBCPP_ENABLE_ASSERTIONS 49# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_EXTENSIVE 50# endif 51# endif 52 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 checks 65// 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 of 68// the fast mode that additionally enables checks that are relatively cheap and prevent common types of logic errors 69// 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 extensive 72// mode and enables all checks available in the library, including internal assertions. Checks that are part of the 73// 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. These 76// 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 and 79// 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 through 84// the container object or through an iterator, are valid and do not attempt to go out of bounds or otherwise access 85// a non-existent element. For iterator checks to work, bounded iterators must be enabled in the ABI. Types like 86// `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 zero 89// address does not refer to an actual location in memory, so a null pointer dereference would not compromize the 90// memory security of a program (however, it is still undefined behavior that can result in strange errors due to 91// compiler optimizations). 92// 93// - `_LIBCPP_ASSERT_NON_OVERLAPPING_RANGES` -- for functions that take several ranges as arguments, checks that the 94// given ranges do not overlap. 95// 96// - `_LIBCPP_ASSERT_VALID_DEALLOCATION` -- checks that an attempt to deallocate memory is valid (e.g. the given object 97// 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 in 100// an unexpected manner. This includes triggering documented cases of undefined behavior in an external library (like 101// attempting to unlock an unlocked mutex in pthreads). Any API external to the library falls under this category 102// (from system calls to compiler intrinsics). We generally don't expect these failures to compromize memory safety or 103// otherwise create an immediate security issue. 104// 105// - `_LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR` -- checks any operations that exchange nodes between containers to make sure 106// the containers have compatible allocators. 107// 108// - `_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN` -- checks that the given argument is within the domain of valid arguments 109// for the function. Violating this typically produces an incorrect result (e.g. the clamp algorithm returns the 110// 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 violating 112// which doesn't cause any immediate issues in the library -- whatever the consequences are, they will happen in the 113// user code. 114// 115// - `_LIBCPP_ASSERT_PEDANTIC` -- checks prerequisites which are imposed by the Standard, but violating which happens to 116// be benign in our implementation. 117// 118// - `_LIBCPP_ASSERT_SEMANTIC_REQUIREMENT` -- checks that the given argument satisfies the semantic requirements imposed 119// 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 on 123// user input. 124// 125// - `_LIBCPP_ASSERT_UNCATEGORIZED` -- for assertions that haven't been properly classified yet. 126 127// clang-format off 128# 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 on 133 134# ifndef _LIBCPP_HARDENING_MODE 135 136# ifndef _LIBCPP_HARDENING_MODE_DEFAULT 137# 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# endif 140 141# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_DEFAULT 142# endif 143 144# 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_DEBUG 148# 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_DEBUG 153# endif 154 155# ifdef _LIBCPP_ASSERTION_SEMANTIC 156# error "Assertion semantics are not available in the C++03 mode." 157# endif 158 159// } HARDENING 160 161# define _LIBCPP_TOSTRING2(x) #x 162# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x) 163 164# ifndef __has_constexpr_builtin 165# define __has_constexpr_builtin(x) 0 166# endif 167 168// This checks wheter a Clang module is built 169# ifndef __building_module 170# define __building_module(...) 0 171# endif 172 173// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by 174// the compiler and '1' otherwise. 175# ifndef __is_identifier 176# define __is_identifier(__x) 1 177# endif 178 179# ifndef __has_declspec_attribute 180# define __has_declspec_attribute(__x) 0 181# endif 182 183# define __has_keyword(__x) !(__is_identifier(__x)) 184 185# ifndef __has_warning 186# define __has_warning(...) 0 187# endif 188 189# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L 190# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11" 191# endif 192 193// FIXME: ABI detection should be done via compiler builtin macros. This 194// is just a placeholder until Clang implements such macros. For now assume 195// 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 this 197// 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_ITANIUM 202# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT) 203# define _LIBCPP_ABI_MICROSOFT 204# else 205# if defined(_WIN32) && defined(_MSC_VER) 206# define _LIBCPP_ABI_MICROSOFT 207# else 208# define _LIBCPP_ABI_ITANIUM 209# endif 210# endif 211 212# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 213# define _LIBCPP_ABI_VCRUNTIME 214# endif 215 216# if __has_feature(experimental_library) 217# ifndef _LIBCPP_ENABLE_EXPERIMENTAL 218# define _LIBCPP_ENABLE_EXPERIMENTAL 219# endif 220# endif 221 222# if defined(__MVS__) 223# include <features.h> // for __NATIVE_ASCII_F 224# endif 225 226# if defined(_WIN32) 227# define _LIBCPP_WIN32API 228# define _LIBCPP_SHORT_WCHAR 1 229// Both MinGW and native MSVC provide a "MSVC"-like environment 230# define _LIBCPP_MSVCRT_LIKE 231// If mingw not explicitly detected, assume using MS C runtime only if 232// a MS compatibility version is specified. 233# if defined(_MSC_VER) && !defined(__MINGW32__) 234# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library 235# endif 236# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__)) 237# define _LIBCPP_HAS_BITSCAN64 238# endif 239# define _LIBCPP_HAS_OPEN_WITH_WCHAR 240# 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 1 245# endif 246 247// Libc++ supports various implementations of std::random_device. 248// 249// _LIBCPP_USING_DEV_RANDOM 250// 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 file 252// to read entropy from. This is the default behavior if nothing 253// else is specified. This implementation requires storing state 254// inside `std::random_device`. 255// 256// _LIBCPP_USING_ARC4_RANDOM 257// Use arc4random(). This allows obtaining random data even when 258// using sandboxing mechanisms. On some platforms like Apple, this 259// is the recommended source of entropy for user-space programs. 260// When this option is used, the token passed to `std::random_device`'s 261// constructor *must* be "/dev/urandom" -- anything else is an error. 262// 263// _LIBCPP_USING_GETENTROPY 264// Use getentropy(). 265// When this option is used, the token passed to `std::random_device`'s 266// constructor *must* be "/dev/urandom" -- anything else is an error. 267// 268// _LIBCPP_USING_FUCHSIA_CPRNG 269// Use Fuchsia's zx_cprng_draw() system call, which is specified to 270// deliver high-quality entropy and cannot fail. 271// When this option is used, the token passed to `std::random_device`'s 272// constructor *must* be "/dev/urandom" -- anything else is an error. 273// 274// _LIBCPP_USING_NACL_RANDOM 275// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access, 276// including accesses to the special files under `/dev`. This implementation 277// uses the NaCL syscall `nacl_secure_random_init()` to get entropy. 278// When this option is used, the token passed to `std::random_device`'s 279// constructor *must* be "/dev/urandom" -- anything else is an error. 280// 281// _LIBCPP_USING_WIN32_RANDOM 282// Use rand_s(), for use on Windows. 283// When this option is used, the token passed to `std::random_device`'s 284// 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_RANDOM 288# elif defined(__wasi__) || defined(__EMSCRIPTEN__) 289# define _LIBCPP_USING_GETENTROPY 290# elif defined(__Fuchsia__) 291# define _LIBCPP_USING_FUCHSIA_CPRNG 292# elif defined(__native_client__) 293# define _LIBCPP_USING_NACL_RANDOM 294# elif defined(_LIBCPP_WIN32API) 295# define _LIBCPP_USING_WIN32_RANDOM 296# else 297# define _LIBCPP_USING_DEV_RANDOM 298# endif 299 300# 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 __nullptr 305# 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_ARC 317# endif 318 319# if __has_feature(objc_arc_weak) 320# define _LIBCPP_HAS_OBJC_ARC_WEAK 321# endif 322 323# if __has_extension(blocks) 324# define _LIBCPP_HAS_EXTENSION_BLOCKS 325# endif 326 327# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__) 328# define _LIBCPP_HAS_BLOCKS_RUNTIME 329# endif 330 331# if !__has_feature(address_sanitizer) 332# define _LIBCPP_HAS_NO_ASAN 333# endif 334 335# 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 _DLL 342# define _LIBCPP_CRT_FUNC __declspec(dllimport) 343# else 344# define _LIBCPP_CRT_FUNC 345# endif 346 347# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY)) 348# define _LIBCPP_DLL_VIS 349# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 350# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 351# define _LIBCPP_OVERRIDABLE_FUNC_VIS 352# define _LIBCPP_EXPORTED_FROM_ABI 353# 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_VIS 357# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 358# else 359# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 360# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS 361# endif 362# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS 363# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport) 364# else 365# define _LIBCPP_DLL_VIS __declspec(dllimport) 366# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 367# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 368# define _LIBCPP_OVERRIDABLE_FUNC_VIS 369# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport) 370# endif 371 372# define _LIBCPP_HIDDEN 373# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 374# define _LIBCPP_TEMPLATE_VIS 375# define _LIBCPP_TEMPLATE_DATA_VIS 376# define _LIBCPP_TYPE_VISIBILITY_DEFAULT 377 378# else 379 380# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 381# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis))) 382# else 383# define _LIBCPP_VISIBILITY(vis) 384# endif 385 386# 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_VIS 391 392// TODO: Make this a proper customization point or remove the option to override it. 393# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS 394# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default") 395# endif 396 397# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 398// The inline should be removed once PR32114 is resolved 399# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN 400# else 401# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 402# endif 403 404// GCC doesn't support the type_visibility attribute, so we have to keep the visibility attribute on templates 405# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && !__has_attribute(__type_visibility__) 406# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default"))) 407# else 408# define _LIBCPP_TEMPLATE_VIS 409# endif 410 411# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) && \ 412 _LIBCPP_CLANG_VER >= 1500 // FreeBSD customization 413# define _LIBCPP_TYPE_VISIBILITY_DEFAULT __attribute__((__type_visibility__("default"))) 414# else 415# define _LIBCPP_TYPE_VISIBILITY_DEFAULT 416# endif 417 418# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF) 419 420# if __has_attribute(exclude_from_explicit_instantiation) 421# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__)) 422# else 423// Try to approximate the effect of exclude_from_explicit_instantiation 424// (which is that entities are not assumed to be provided by explicit 425// template instantiations in the dylib) by always inlining those entities. 426# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE 427# endif 428 429# ifdef _LIBCPP_COMPILER_CLANG_BASED 430# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push") 431# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop") 432# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str)) 433# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 434# elif defined(_LIBCPP_COMPILER_GCC) 435# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push") 436# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop") 437# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 438# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str)) 439# else 440# define _LIBCPP_DIAGNOSTIC_PUSH 441# define _LIBCPP_DIAGNOSTIC_POP 442# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 443# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 444# endif 445 446# if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST 447# define _LIBCPP_HARDENING_SIG f 448# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE 449# define _LIBCPP_HARDENING_SIG s 450# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG 451# define _LIBCPP_HARDENING_SIG d 452# else 453# define _LIBCPP_HARDENING_SIG n // "none" 454# endif 455 456# ifdef _LIBCPP_HAS_NO_EXCEPTIONS 457# define _LIBCPP_EXCEPTIONS_SIG n 458# else 459# define _LIBCPP_EXCEPTIONS_SIG e 460# endif 461 462# define _LIBCPP_ODR_SIGNATURE \ 463 _LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION) 464 465// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved 466// on two levels: 467// 1. The symbol is given hidden visibility, which ensures that users won't start exporting 468// symbols from their dynamic library by means of using the libc++ headers. This ensures 469// that those symbols stay private to the dynamic library in which it is defined. 470// 471// 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library. 472// This ensures that no ODR violation can arise from mixing two TUs compiled with different 473// versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the 474// program contains two definitions of a function, the ODR requires them to be token-by-token 475// equivalent, and the linker is allowed to pick either definition and discard the other one. 476// 477// For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled 478// *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs 479// compiled with different settings), the two definitions are both visible by the linker and they 480// have the same name, but they have a meaningfully different implementation (one throws an exception 481// and the other aborts the program). This violates the ODR and makes the program ill-formed, and in 482// practice what will happen is that the linker will pick one of the definitions at random and will 483// discard the other one. This can quite clearly lead to incorrect program behavior. 484// 485// A similar reasoning holds for many other properties that are ODR-affecting. Essentially any 486// property that causes the code of a function to differ from the code in another configuration 487// can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI 488// tag, but we encode the ones that we think are most important: library version, exceptions, and 489// hardening mode. 490// 491// Note that historically, solving this problem has been achieved in various ways, including 492// force-inlining all functions or giving internal linkage to all functions. Both these previous 493// solutions suffer from drawbacks that lead notably to code bloat. 494// 495// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend 496// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library. 497// 498// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions 499// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled 500// name of a virtual function is part of its ABI, since some architectures like arm64e can sign 501// the virtual function pointer in the vtable based on the mangled name of the function. Since 502// we use an ABI tag that changes with each released version, the mangled name of the virtual 503// function would change, which is incorrect. Note that it doesn't make much sense to change 504// the implementation of a virtual function in an ABI-incompatible way in the first place, 505// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable. 506// 507// The macro can be applied to record and enum types. When the tagged type is nested in 508// a record this "parent" record needs to have the macro too. Another use case for applying 509// this macro to records and unions is to apply an ABI tag to inline constexpr variables. 510// This can be useful for inline variables that are implementation details which are expected 511// to change in the future. 512// 513// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing 514// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and 515// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70. 516# ifndef _LIBCPP_NO_ABI_TAG 517# define _LIBCPP_HIDE_FROM_ABI \ 518 _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \ 519 __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE)))) 520# else 521# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 522# endif 523# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 524 525# ifdef _LIBCPP_BUILDING_LIBRARY 526# if _LIBCPP_ABI_VERSION > 1 527# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 528# else 529# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 530# endif 531# else 532# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 533# endif 534 535// TODO: Remove this workaround once we drop support for Clang 16 536# if __has_warning("-Wc++23-extensions") 537# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++23-extensions") 538# else 539# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++2b-extensions") 540# endif 541 542// Clang modules take a significant compile time hit when pushing and popping diagnostics. 543// Since all the headers are marked as system headers in the modulemap, we can simply disable this 544// pushing and popping when building with clang modules. 545# if !__has_feature(modules) 546# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \ 547 _LIBCPP_DIAGNOSTIC_PUSH \ 548 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++11-extensions") \ 549 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \ 550 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \ 551 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \ 552 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION \ 553 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \ 554 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \ 555 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \ 556 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++23-extensions") 557# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS _LIBCPP_DIAGNOSTIC_POP 558# else 559# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS 560# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS 561# endif 562 563// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect. 564// clang-format off 565# define _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \ 566 namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std { \ 567 inline namespace _LIBCPP_ABI_NAMESPACE { 568# define _LIBCPP_END_NAMESPACE_STD }} _LIBCPP_POP_EXTENSION_DIAGNOSTICS 569 570#ifdef _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE 571# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD namespace filesystem { 572# define _LIBCPP_END_NAMESPACE_FILESYSTEM } _LIBCPP_END_NAMESPACE_STD 573#else 574# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD \ 575 inline namespace __fs { namespace filesystem { 576 577# define _LIBCPP_END_NAMESPACE_FILESYSTEM }} _LIBCPP_END_NAMESPACE_STD 578#endif 579 580// clang-format on 581 582# if __has_attribute(__enable_if__) 583# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, ""))) 584# endif 585 586# if !defined(__SIZEOF_INT128__) || defined(_MSC_VER) 587# define _LIBCPP_HAS_NO_INT128 588# endif 589 590# define _LIBCPP_DECLARE_STRONG_ENUM(x) \ 591 struct _LIBCPP_EXPORTED_FROM_ABI x { \ 592 enum __lx 593// clang-format off 594# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \ 595 __lx __v_; \ 596 _LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {} \ 597 _LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \ 598 _LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; } \ 599 }; 600// clang-format on 601 602# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__) 603# define _LIBCPP_LOCALE__L_EXTENSIONS 1 604# endif 605 606# ifdef __FreeBSD__ 607# define _DECLARE_C99_LDBL_MATH 1 608# endif 609 610// If we are getting operator new from the MSVC CRT, then allocation overloads 611// for align_val_t were added in 19.12, aka VS 2017 version 15.3. 612# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912 613# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 614# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new) 615// We're deferring to Microsoft's STL to provide aligned new et al. We don't 616// have it unless the language feature test macro is defined. 617# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 618# elif defined(__MVS__) 619# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 620# endif 621 622# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606) 623# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 624# endif 625 626// It is not yet possible to use aligned_alloc() on all Apple platforms since 627// 10.15 was the first version to ship an implementation of aligned_alloc(). 628# if defined(__APPLE__) 629# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 630 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) 631# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 632# endif 633# elif defined(__ANDROID__) && __ANDROID_API__ < 28 634// Android only provides aligned_alloc when targeting API 28 or higher. 635# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 636# endif 637 638# if defined(__APPLE__) || defined(__FreeBSD__) 639# define _LIBCPP_HAS_DEFAULTRUNELOCALE 640# endif 641 642# if defined(__APPLE__) || defined(__FreeBSD__) 643# define _LIBCPP_WCTYPE_IS_MASK 644# endif 645 646# define _LIBCPP_HAS_NO_CHAR8_T 647 648// Deprecation macros. 649// 650// Deprecations warnings are always enabled, except when users explicitly opt-out 651// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS. 652# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 653# define _LIBCPP_DEPRECATED __attribute__((__deprecated__)) 654# define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m))) 655# else 656# define _LIBCPP_DEPRECATED 657# define _LIBCPP_DEPRECATED_(m) 658# endif 659 660# define _LIBCPP_DEPRECATED_ATOMIC_SYNC /* nothing */ 661 662# if !defined(_LIBCPP_HAS_NO_CHAR8_T) 663# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED 664# else 665# define _LIBCPP_DEPRECATED_WITH_CHAR8_T 666# endif 667 668// Macros to enter and leave a state where deprecation warnings are suppressed. 669# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC) 670# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \ 671 _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \ 672 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") 673# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop") 674# else 675# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH 676# define _LIBCPP_SUPPRESS_DEPRECATED_POP 677# endif 678 679# ifndef _LIBCPP_WEAK 680# define _LIBCPP_WEAK __attribute__((__weak__)) 681# endif 682 683// Thread API 684// clang-format off 685# if !defined(_LIBCPP_HAS_NO_THREADS) && \ 686 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \ 687 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \ 688 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 689 690# if defined(__FreeBSD__) || \ 691 defined(__wasi__) || \ 692 defined(__NetBSD__) || \ 693 defined(__OpenBSD__) || \ 694 defined(__NuttX__) || \ 695 defined(__linux__) || \ 696 defined(__GNU__) || \ 697 defined(__APPLE__) || \ 698 defined(__MVS__) || \ 699 defined(_AIX) || \ 700 defined(__EMSCRIPTEN__) 701// clang-format on 702# define _LIBCPP_HAS_THREAD_API_PTHREAD 703# elif defined(__Fuchsia__) 704// TODO(44575): Switch to C11 thread API when possible. 705# define _LIBCPP_HAS_THREAD_API_PTHREAD 706# elif defined(_LIBCPP_WIN32API) 707# define _LIBCPP_HAS_THREAD_API_WIN32 708# else 709# error "No thread API" 710# endif // _LIBCPP_HAS_THREAD_API 711# endif // _LIBCPP_HAS_NO_THREADS 712 713# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 714# if defined(__ANDROID__) && __ANDROID_API__ >= 30 715# define _LIBCPP_HAS_COND_CLOCKWAIT 716# elif defined(_LIBCPP_GLIBC_PREREQ) 717# if _LIBCPP_GLIBC_PREREQ(2, 30) 718# define _LIBCPP_HAS_COND_CLOCKWAIT 719# endif 720# endif 721# endif 722 723# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 724# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \ 725 _LIBCPP_HAS_NO_THREADS is not defined. 726# endif 727 728# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 729# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \ 730 _LIBCPP_HAS_NO_THREADS is defined. 731# endif 732 733# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS) 734# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \ 735 _LIBCPP_HAS_NO_THREADS is defined. 736# endif 737 738# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) 739# define __STDCPP_THREADS__ 1 740# endif 741 742// The glibc and Bionic implementation of pthreads implements 743// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32 744// mutexes have no destroy mechanism. 745// 746// This optimization can't be performed on Apple platforms, where 747// pthread_mutex_destroy can allow the kernel to release resources. 748// See https://llvm.org/D64298 for details. 749// 750// TODO(EricWF): Enable this optimization on Bionic after speaking to their 751// respective stakeholders. 752// clang-format off 753# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \ 754 (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \ 755 defined(_LIBCPP_HAS_THREAD_API_WIN32) 756// clang-format on 757# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 758# endif 759 760// Destroying a condvar is a nop on Windows. 761// 762// This optimization can't be performed on Apple platforms, where 763// pthread_cond_destroy can allow the kernel to release resources. 764// See https://llvm.org/D64298 for details. 765// 766// TODO(EricWF): This is potentially true for some pthread implementations 767// as well. 768# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32) 769# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 770# endif 771 772# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \ 773 defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__) 774# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE 775# endif 776 777# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic) 778# define _LIBCPP_HAS_C_ATOMIC_IMP 779# elif defined(_LIBCPP_COMPILER_GCC) 780# define _LIBCPP_HAS_GCC_ATOMIC_IMP 781# endif 782 783# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \ 784 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP) 785# define _LIBCPP_HAS_NO_ATOMIC_HEADER 786# else 787# ifndef _LIBCPP_ATOMIC_FLAG_TYPE 788# define _LIBCPP_ATOMIC_FLAG_TYPE bool 789# endif 790# endif 791 792# if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(__no_thread_safety_analysis__) 793# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((__no_thread_safety_analysis__)) 794# else 795# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS 796# endif 797 798# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) 799# if defined(__clang__) && __has_attribute(acquire_capability) 800// Work around the attribute handling in clang. When both __declspec and 801// __attribute__ are present, the processing goes awry preventing the definition 802// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus 803// combining the two does work. 804# if !defined(_MSC_VER) 805# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 806# endif 807# endif 808# endif 809 810# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 811# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x)) 812# else 813# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) 814# endif 815 816# if __has_attribute(__require_constant_initialization__) 817# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__)) 818# else 819# define _LIBCPP_CONSTINIT 820# endif 821 822# if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__) 823// The CUDA SDK contains an unfortunate definition for the __noinline__ macro, 824// which breaks the regular __attribute__((__noinline__)) syntax. Therefore, 825// when compiling for CUDA we use the non-underscored version of the noinline 826// attribute. 827// 828// This is a temporary workaround and we still expect the CUDA SDK team to solve 829// this issue properly in the SDK headers. 830// 831// See https://github.com/llvm/llvm-project/pull/73838 for more details. 832# define _LIBCPP_NOINLINE __attribute__((noinline)) 833# elif __has_attribute(__noinline__) 834# define _LIBCPP_NOINLINE __attribute__((__noinline__)) 835# else 836# define _LIBCPP_NOINLINE 837# endif 838 839// We often repeat things just for handling wide characters in the library. 840// When wide characters are disabled, it can be useful to have a quick way of 841// disabling it without having to resort to #if-#endif, which has a larger 842// impact on readability. 843# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) 844# define _LIBCPP_IF_WIDE_CHARACTERS(...) 845# else 846# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__ 847# endif 848 849// clang-format off 850# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")") 851# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")") 852// clang-format on 853 854# ifndef _LIBCPP_NO_AUTO_LINK 855# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 856# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 857# pragma comment(lib, "c++.lib") 858# else 859# pragma comment(lib, "libc++.lib") 860# endif 861# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 862# endif // _LIBCPP_NO_AUTO_LINK 863 864// Configures the fopen close-on-exec mode character, if any. This string will 865// be appended to any mode string used by fstream for fopen/fdopen. 866// 867// Not all platforms support this, but it helps avoid fd-leaks on platforms that 868// do. 869# if defined(__BIONIC__) 870# define _LIBCPP_FOPEN_CLOEXEC_MODE "e" 871# else 872# define _LIBCPP_FOPEN_CLOEXEC_MODE 873# endif 874 875# if __has_cpp_attribute(msvc::no_unique_address) 876// MSVC implements [[no_unique_address]] as a silent no-op currently. 877// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.) 878// However, MSVC implements [[msvc::no_unique_address]] which does what 879// [[no_unique_address]] is supposed to do, in general. 880 881// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or 882// [[msvc::no_unique_address]] though. If/when it does implement 883// [[msvc::no_unique_address]], this should be preferred though. 884# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]] 885# elif __has_cpp_attribute(no_unique_address) 886# define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]] 887# else 888# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */ 889// Note that this can be replaced by #error as soon as clang-cl 890// implements msvc::no_unique_address, since there should be no C++20 891// compiler that doesn't support one of the two attributes at that point. 892// We generally don't want to use this macro outside of C++20-only code, 893// because using it conditionally in one language version only would make 894// the ABI inconsistent. 895# endif 896 897// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these 898// functions is gradually being added to existing C libraries. The conditions 899// below check for known C library versions and conditions under which these 900// functions are declared by the C library. 901# define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 902// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if 903// __cpp_char8_t is defined or if C2X extensions are enabled. Determining 904// the latter depends on internal GNU libc details that are not appropriate 905// to depend on here, so any declarations present when __cpp_char8_t is not 906// defined are ignored. 907# if defined(_LIBCPP_GLIBC_PREREQ) 908# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t) 909# undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 910# endif 911# endif 912 913// There are a handful of public standard library types that are intended to 914// support CTAD but don't need any explicit deduction guides to do so. This 915// macro is used to mark them as such, which suppresses the 916// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code 917// with these classes. 918# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "") 919 920// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use 921// compiler intrinsics in the Objective-C++ mode. 922# ifdef __OBJC__ 923# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS 924# endif 925 926# define _PSTL_PRAGMA(x) _Pragma(#x) 927 928// Enable SIMD for compilers that support OpenMP 4.0 929# if (defined(_OPENMP) && _OPENMP >= 201307) 930 931# define _PSTL_UDR_PRESENT 932# define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd) 933# define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd) 934# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM)) 935# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM)) 936# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM)) 937# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM)) 938 939// Declaration of reduction functor, where 940// NAME - the name of the functor 941// OP - type of the callable object with the reduction operation 942// omp_in - refers to the local partial result 943// omp_out - refers to the final value of the combiner operator 944// omp_priv - refers to the private copy of the initial value 945// omp_orig - refers to the original variable to be reduced 946# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) \ 947 _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig)) 948 949# elif defined(_LIBCPP_COMPILER_CLANG_BASED) 950 951# define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)") 952# define _PSTL_PRAGMA_DECLARE_SIMD 953# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)") 954# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)") 955# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 956# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 957# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) 958 959# else // (defined(_OPENMP) && _OPENMP >= 201307) 960 961# define _PSTL_PRAGMA_SIMD 962# define _PSTL_PRAGMA_DECLARE_SIMD 963# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) 964# define _PSTL_PRAGMA_SIMD_SCAN(PRM) 965# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 966# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 967# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) 968 969# endif // (defined(_OPENMP) && _OPENMP >= 201307) 970 971# define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED 972 973// Optional attributes - these are useful for a better QoI, but not required to be available 974 975# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC) 976# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi"))) 977# else 978# define _LIBCPP_NO_CFI 979# endif 980 981# if __has_attribute(__malloc__) 982# define _LIBCPP_NOALIAS __attribute__((__malloc__)) 983# else 984# define _LIBCPP_NOALIAS 985# endif 986 987# if __has_attribute(__using_if_exists__) 988# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__)) 989# else 990# define _LIBCPP_USING_IF_EXISTS 991# endif 992 993# if __has_cpp_attribute(__nodiscard__) 994# define _LIBCPP_NODISCARD [[__nodiscard__]] 995# else 996// We can't use GCC's [[gnu::warn_unused_result]] and 997// __attribute__((warn_unused_result)), because GCC does not silence them via 998// (void) cast. 999# define _LIBCPP_NODISCARD 1000# endif 1001 1002# if __has_attribute(__no_destroy__) 1003# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__)) 1004# else 1005# define _LIBCPP_NO_DESTROY 1006# endif 1007 1008# if __has_attribute(__diagnose_if__) 1009# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning"))) 1010# else 1011# define _LIBCPP_DIAGNOSE_WARNING(...) 1012# endif 1013 1014// Use a function like macro to imply that it must be followed by a semicolon 1015# if __has_cpp_attribute(fallthrough) 1016# define _LIBCPP_FALLTHROUGH() [[fallthrough]] 1017# elif __has_attribute(__fallthrough__) 1018# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__)) 1019# else 1020# define _LIBCPP_FALLTHROUGH() ((void)0) 1021# endif 1022 1023# if __has_cpp_attribute(_Clang::__lifetimebound__) 1024# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]] 1025# else 1026# define _LIBCPP_LIFETIMEBOUND 1027# endif 1028 1029# if __has_attribute(__nodebug__) 1030# define _LIBCPP_NODEBUG __attribute__((__nodebug__)) 1031# else 1032# define _LIBCPP_NODEBUG 1033# endif 1034 1035# if __has_attribute(__standalone_debug__) 1036# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__)) 1037# else 1038# define _LIBCPP_STANDALONE_DEBUG 1039# endif 1040 1041# if __has_attribute(__preferred_name__) 1042# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x))) 1043# else 1044# define _LIBCPP_PREFERRED_NAME(x) 1045# endif 1046 1047# if __has_attribute(__no_sanitize__) 1048# define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__))) 1049# else 1050# define _LIBCPP_NO_SANITIZE(...) 1051# endif 1052 1053# if __has_attribute(__init_priority__) 1054# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100))) 1055# else 1056# define _LIBCPP_INIT_PRIORITY_MAX 1057# endif 1058 1059# if __has_attribute(__format__) 1060// The attribute uses 1-based indices for ordinary and static member functions. 1061// The attribute uses 2-based indices for non-static member functions. 1062# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \ 1063 __attribute__((__format__(archetype, format_string_index, first_format_arg_index))) 1064# else 1065# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */ 1066# endif 1067 1068# if __has_attribute(__packed__) 1069# define _LIBCPP_PACKED __attribute__((__packed__)) 1070# else 1071# define _LIBCPP_PACKED 1072# endif 1073 1074# if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases) 1075# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases) 1076# else 1077# define _LIBCPP_DECLSPEC_EMPTY_BASES 1078# endif 1079 1080// Allow for build-time disabling of unsigned integer sanitization 1081# if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC) 1082# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow"))) 1083# else 1084# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1085# endif 1086 1087// Clang-18 has support for deducing this, but it does not set the FTM. 1088# if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800) 1089# define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 1090# endif 1091 1092#endif // __cplusplus 1093 1094#endif // _LIBCPP___CXX03___CONFIG 1095