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___CONFIG 11#define _LIBCPP___CONFIG 12 13#include <__config_site> 14#include <__configuration/abi.h> 15#include <__configuration/availability.h> 16#include <__configuration/compiler.h> 17#include <__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 200000 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// } HARDENING 156 157# define _LIBCPP_TOSTRING2(x) #x 158# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x) 159 160// NOLINTNEXTLINE(libcpp-cpp-version-check) 161# if __cplusplus < 201103L 162# define _LIBCPP_CXX03_LANG 163# endif 164 165# ifndef __has_constexpr_builtin 166# define __has_constexpr_builtin(x) 0 167# endif 168 169// This checks wheter a Clang module is built 170# ifndef __building_module 171# define __building_module(...) 0 172# endif 173 174// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by 175// the compiler and '1' otherwise. 176# ifndef __is_identifier 177# define __is_identifier(__x) 1 178# endif 179 180# ifndef __has_declspec_attribute 181# define __has_declspec_attribute(__x) 0 182# endif 183 184# define __has_keyword(__x) !(__is_identifier(__x)) 185 186# ifndef __has_warning 187# define __has_warning(...) 0 188# endif 189 190# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L 191# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11" 192# endif 193 194// FIXME: ABI detection should be done via compiler builtin macros. This 195// is just a placeholder until Clang implements such macros. For now assume 196// that Windows compilers pretending to be MSVC++ target the Microsoft ABI, 197// and allow the user to explicitly specify the ABI to handle cases where this 198// heuristic falls short. 199# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT) 200# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined" 201# elif defined(_LIBCPP_ABI_FORCE_ITANIUM) 202# define _LIBCPP_ABI_ITANIUM 203# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT) 204# define _LIBCPP_ABI_MICROSOFT 205# else 206# if defined(_WIN32) && defined(_MSC_VER) 207# define _LIBCPP_ABI_MICROSOFT 208# else 209# define _LIBCPP_ABI_ITANIUM 210# endif 211# endif 212 213# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 214# define _LIBCPP_ABI_VCRUNTIME 215# endif 216 217# if __has_feature(experimental_library) 218# ifndef _LIBCPP_ENABLE_EXPERIMENTAL 219# define _LIBCPP_ENABLE_EXPERIMENTAL 220# endif 221# endif 222 223// Incomplete features get their own specific disabling flags. This makes it 224// easier to grep for target specific flags once the feature is complete. 225# if !defined(_LIBCPP_ENABLE_EXPERIMENTAL) && !defined(_LIBCPP_BUILDING_LIBRARY) 226# define _LIBCPP_HAS_NO_INCOMPLETE_PSTL 227# define _LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN 228# define _LIBCPP_HAS_NO_EXPERIMENTAL_TZDB 229# define _LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM 230# endif 231 232# if defined(__MVS__) 233# include <features.h> // for __NATIVE_ASCII_F 234# endif 235 236# if defined(_WIN32) 237# define _LIBCPP_WIN32API 238# define _LIBCPP_SHORT_WCHAR 1 239// Both MinGW and native MSVC provide a "MSVC"-like environment 240# define _LIBCPP_MSVCRT_LIKE 241// If mingw not explicitly detected, assume using MS C runtime only if 242// a MS compatibility version is specified. 243# if defined(_MSC_VER) && !defined(__MINGW32__) 244# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library 245# endif 246# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__)) 247# define _LIBCPP_HAS_BITSCAN64 248# endif 249# define _LIBCPP_HAS_OPEN_WITH_WCHAR 250# endif // defined(_WIN32) 251 252# if defined(_AIX) && !defined(__64BIT__) 253// The size of wchar is 2 byte on 32-bit mode on AIX. 254# define _LIBCPP_SHORT_WCHAR 1 255# endif 256 257// Libc++ supports various implementations of std::random_device. 258// 259// _LIBCPP_USING_DEV_RANDOM 260// Read entropy from the given file, by default `/dev/urandom`. 261// If a token is provided, it is assumed to be the path to a file 262// to read entropy from. This is the default behavior if nothing 263// else is specified. This implementation requires storing state 264// inside `std::random_device`. 265// 266// _LIBCPP_USING_ARC4_RANDOM 267// Use arc4random(). This allows obtaining random data even when 268// using sandboxing mechanisms. On some platforms like Apple, this 269// is the recommended source of entropy for user-space programs. 270// When this option is used, the token passed to `std::random_device`'s 271// constructor *must* be "/dev/urandom" -- anything else is an error. 272// 273// _LIBCPP_USING_GETENTROPY 274// Use getentropy(). 275// When this option is used, the token passed to `std::random_device`'s 276// constructor *must* be "/dev/urandom" -- anything else is an error. 277// 278// _LIBCPP_USING_FUCHSIA_CPRNG 279// Use Fuchsia's zx_cprng_draw() system call, which is specified to 280// deliver high-quality entropy and cannot fail. 281// When this option is used, the token passed to `std::random_device`'s 282// constructor *must* be "/dev/urandom" -- anything else is an error. 283// 284// _LIBCPP_USING_NACL_RANDOM 285// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access, 286// including accesses to the special files under `/dev`. This implementation 287// uses the NaCL syscall `nacl_secure_random_init()` to get entropy. 288// When this option is used, the token passed to `std::random_device`'s 289// constructor *must* be "/dev/urandom" -- anything else is an error. 290// 291// _LIBCPP_USING_WIN32_RANDOM 292// Use rand_s(), for use on Windows. 293// When this option is used, the token passed to `std::random_device`'s 294// constructor *must* be "/dev/urandom" -- anything else is an error. 295# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \ 296 defined(__DragonFly__) 297# define _LIBCPP_USING_ARC4_RANDOM 298# elif defined(__wasi__) || defined(__EMSCRIPTEN__) 299# define _LIBCPP_USING_GETENTROPY 300# elif defined(__Fuchsia__) 301# define _LIBCPP_USING_FUCHSIA_CPRNG 302# elif defined(__native_client__) 303# define _LIBCPP_USING_NACL_RANDOM 304# elif defined(_LIBCPP_WIN32API) 305# define _LIBCPP_USING_WIN32_RANDOM 306# else 307# define _LIBCPP_USING_DEV_RANDOM 308# endif 309 310# ifndef _LIBCPP_CXX03_LANG 311 312# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp) 313# define _ALIGNAS_TYPE(x) alignas(x) 314# define _ALIGNAS(x) alignas(x) 315# define _LIBCPP_NORETURN [[noreturn]] 316# define _NOEXCEPT noexcept 317# define _NOEXCEPT_(...) noexcept(__VA_ARGS__) 318# define _LIBCPP_CONSTEXPR constexpr 319 320# else 321 322# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp) 323# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 324# define _ALIGNAS(x) __attribute__((__aligned__(x))) 325# define _LIBCPP_NORETURN __attribute__((__noreturn__)) 326# define _LIBCPP_HAS_NO_NOEXCEPT 327# define nullptr __nullptr 328# define _NOEXCEPT throw() 329# define _NOEXCEPT_(...) 330# define static_assert(...) _Static_assert(__VA_ARGS__) 331# define decltype(...) __decltype(__VA_ARGS__) 332# define _LIBCPP_CONSTEXPR 333 334typedef __char16_t char16_t; 335typedef __char32_t char32_t; 336 337# endif 338 339# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp) 340 341// Objective-C++ features (opt-in) 342# if __has_feature(objc_arc) 343# define _LIBCPP_HAS_OBJC_ARC 344# endif 345 346# if __has_feature(objc_arc_weak) 347# define _LIBCPP_HAS_OBJC_ARC_WEAK 348# endif 349 350# if __has_extension(blocks) 351# define _LIBCPP_HAS_EXTENSION_BLOCKS 352# endif 353 354# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__) 355# define _LIBCPP_HAS_BLOCKS_RUNTIME 356# endif 357 358# if !__has_feature(address_sanitizer) 359# define _LIBCPP_HAS_NO_ASAN 360# endif 361 362# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 363 364# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 365 366# if defined(_LIBCPP_OBJECT_FORMAT_COFF) 367 368# ifdef _DLL 369# define _LIBCPP_CRT_FUNC __declspec(dllimport) 370# else 371# define _LIBCPP_CRT_FUNC 372# endif 373 374# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY)) 375# define _LIBCPP_DLL_VIS 376# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 377# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 378# define _LIBCPP_OVERRIDABLE_FUNC_VIS 379# define _LIBCPP_EXPORTED_FROM_ABI 380# elif defined(_LIBCPP_BUILDING_LIBRARY) 381# define _LIBCPP_DLL_VIS __declspec(dllexport) 382# if defined(__MINGW32__) 383# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 384# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 385# else 386# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 387# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS 388# endif 389# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS 390# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport) 391# else 392# define _LIBCPP_DLL_VIS __declspec(dllimport) 393# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 394# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 395# define _LIBCPP_OVERRIDABLE_FUNC_VIS 396# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport) 397# endif 398 399# define _LIBCPP_HIDDEN 400# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 401# define _LIBCPP_TEMPLATE_VIS 402# define _LIBCPP_TEMPLATE_DATA_VIS 403# define _LIBCPP_TYPE_VISIBILITY_DEFAULT 404 405# else 406 407# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 408# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis))) 409# else 410# define _LIBCPP_VISIBILITY(vis) 411# endif 412 413# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden") 414# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default") 415# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default") 416# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default") 417# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 418 419// TODO: Make this a proper customization point or remove the option to override it. 420# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS 421# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default") 422# endif 423 424# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 425// The inline should be removed once PR32114 is resolved 426# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN 427# else 428# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 429# endif 430 431// GCC doesn't support the type_visibility attribute, so we have to keep the visibility attribute on templates 432# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && !__has_attribute(__type_visibility__) 433# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default"))) 434# else 435# define _LIBCPP_TEMPLATE_VIS 436# endif 437 438# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) 439# define _LIBCPP_TYPE_VISIBILITY_DEFAULT __attribute__((__type_visibility__("default"))) 440# else 441# define _LIBCPP_TYPE_VISIBILITY_DEFAULT 442# endif 443 444# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF) 445 446# if __has_attribute(exclude_from_explicit_instantiation) 447# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__)) 448# else 449// Try to approximate the effect of exclude_from_explicit_instantiation 450// (which is that entities are not assumed to be provided by explicit 451// template instantiations in the dylib) by always inlining those entities. 452# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE 453# endif 454 455# ifdef _LIBCPP_COMPILER_CLANG_BASED 456# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push") 457# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop") 458# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str)) 459# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 460# elif defined(_LIBCPP_COMPILER_GCC) 461# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push") 462# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop") 463# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 464# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str)) 465# else 466# define _LIBCPP_DIAGNOSTIC_PUSH 467# define _LIBCPP_DIAGNOSTIC_POP 468# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 469# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 470# endif 471 472# if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST 473# define _LIBCPP_HARDENING_SIG f 474# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE 475# define _LIBCPP_HARDENING_SIG s 476# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG 477# define _LIBCPP_HARDENING_SIG d 478# else 479# define _LIBCPP_HARDENING_SIG n // "none" 480# endif 481 482# ifdef _LIBCPP_HAS_NO_EXCEPTIONS 483# define _LIBCPP_EXCEPTIONS_SIG n 484# else 485# define _LIBCPP_EXCEPTIONS_SIG e 486# endif 487 488# define _LIBCPP_ODR_SIGNATURE \ 489 _LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION) 490 491// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved 492// on two levels: 493// 1. The symbol is given hidden visibility, which ensures that users won't start exporting 494// symbols from their dynamic library by means of using the libc++ headers. This ensures 495// that those symbols stay private to the dynamic library in which it is defined. 496// 497// 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library. 498// This ensures that no ODR violation can arise from mixing two TUs compiled with different 499// versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the 500// program contains two definitions of a function, the ODR requires them to be token-by-token 501// equivalent, and the linker is allowed to pick either definition and discard the other one. 502// 503// For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled 504// *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs 505// compiled with different settings), the two definitions are both visible by the linker and they 506// have the same name, but they have a meaningfully different implementation (one throws an exception 507// and the other aborts the program). This violates the ODR and makes the program ill-formed, and in 508// practice what will happen is that the linker will pick one of the definitions at random and will 509// discard the other one. This can quite clearly lead to incorrect program behavior. 510// 511// A similar reasoning holds for many other properties that are ODR-affecting. Essentially any 512// property that causes the code of a function to differ from the code in another configuration 513// can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI 514// tag, but we encode the ones that we think are most important: library version, exceptions, and 515// hardening mode. 516// 517// Note that historically, solving this problem has been achieved in various ways, including 518// force-inlining all functions or giving internal linkage to all functions. Both these previous 519// solutions suffer from drawbacks that lead notably to code bloat. 520// 521// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend 522// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library. 523// 524// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions 525// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled 526// name of a virtual function is part of its ABI, since some architectures like arm64e can sign 527// the virtual function pointer in the vtable based on the mangled name of the function. Since 528// we use an ABI tag that changes with each released version, the mangled name of the virtual 529// function would change, which is incorrect. Note that it doesn't make much sense to change 530// the implementation of a virtual function in an ABI-incompatible way in the first place, 531// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable. 532// 533// The macro can be applied to record and enum types. When the tagged type is nested in 534// a record this "parent" record needs to have the macro too. Another use case for applying 535// this macro to records and unions is to apply an ABI tag to inline constexpr variables. 536// This can be useful for inline variables that are implementation details which are expected 537// to change in the future. 538// 539// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing 540// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and 541// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70. 542# ifndef _LIBCPP_NO_ABI_TAG 543# define _LIBCPP_HIDE_FROM_ABI \ 544 _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \ 545 __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE)))) 546# else 547# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 548# endif 549# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 550 551# ifdef _LIBCPP_BUILDING_LIBRARY 552# if _LIBCPP_ABI_VERSION > 1 553# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 554# else 555# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 556# endif 557# else 558# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 559# endif 560 561// TODO: Remove this workaround once we drop support for Clang 16 562# if __has_warning("-Wc++23-extensions") 563# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++23-extensions") 564# else 565# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++2b-extensions") 566# endif 567 568// Clang modules take a significant compile time hit when pushing and popping diagnostics. 569// Since all the headers are marked as system headers in the modulemap, we can simply disable this 570// pushing and popping when building with clang modules. 571# if !__has_feature(modules) 572# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \ 573 _LIBCPP_DIAGNOSTIC_PUSH \ 574 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++11-extensions") \ 575 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \ 576 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \ 577 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \ 578 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED_CXX23_EXTENSION \ 579 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++14-extensions") \ 580 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++17-extensions") \ 581 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++20-extensions") \ 582 _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wc++23-extensions") 583# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS _LIBCPP_DIAGNOSTIC_POP 584# else 585# define _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS 586# define _LIBCPP_POP_EXTENSION_DIAGNOSTICS 587# endif 588 589// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect. 590// clang-format off 591# define _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_PUSH_EXTENSION_DIAGNOSTICS \ 592 namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std { \ 593 inline namespace _LIBCPP_ABI_NAMESPACE { 594# define _LIBCPP_END_NAMESPACE_STD }} _LIBCPP_POP_EXTENSION_DIAGNOSTICS 595 596#ifdef _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE 597# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD namespace filesystem { 598# define _LIBCPP_END_NAMESPACE_FILESYSTEM } _LIBCPP_END_NAMESPACE_STD 599#else 600# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD \ 601 inline namespace __fs { namespace filesystem { 602 603# define _LIBCPP_END_NAMESPACE_FILESYSTEM }} _LIBCPP_END_NAMESPACE_STD 604#endif 605 606// clang-format on 607 608# if __has_attribute(__enable_if__) 609# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, ""))) 610# endif 611 612# if !defined(__SIZEOF_INT128__) || defined(_MSC_VER) 613# define _LIBCPP_HAS_NO_INT128 614# endif 615 616# ifdef _LIBCPP_CXX03_LANG 617# define _LIBCPP_DECLARE_STRONG_ENUM(x) \ 618 struct _LIBCPP_EXPORTED_FROM_ABI x { \ 619 enum __lx 620// clang-format off 621# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \ 622 __lx __v_; \ 623 _LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {} \ 624 _LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \ 625 _LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; } \ 626 }; 627// clang-format on 628 629# else // _LIBCPP_CXX03_LANG 630# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class x 631# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) 632# endif // _LIBCPP_CXX03_LANG 633 634# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__) 635# define _LIBCPP_LOCALE__L_EXTENSIONS 1 636# endif 637 638# ifdef __FreeBSD__ 639# define _DECLARE_C99_LDBL_MATH 1 640# endif 641 642// If we are getting operator new from the MSVC CRT, then allocation overloads 643// for align_val_t were added in 19.12, aka VS 2017 version 15.3. 644# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912 645# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 646# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new) 647// We're deferring to Microsoft's STL to provide aligned new et al. We don't 648// have it unless the language feature test macro is defined. 649# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 650# elif defined(__MVS__) 651# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 652# endif 653 654# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606) 655# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 656# endif 657 658// It is not yet possible to use aligned_alloc() on all Apple platforms since 659// 10.15 was the first version to ship an implementation of aligned_alloc(). 660# if defined(__APPLE__) 661# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 662 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) 663# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 664# endif 665# elif defined(__ANDROID__) && __ANDROID_API__ < 28 666// Android only provides aligned_alloc when targeting API 28 or higher. 667# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 668# endif 669 670# if defined(__APPLE__) || defined(__FreeBSD__) 671# define _LIBCPP_HAS_DEFAULTRUNELOCALE 672# endif 673 674# if defined(__APPLE__) || defined(__FreeBSD__) 675# define _LIBCPP_WCTYPE_IS_MASK 676# endif 677 678# if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t) 679# define _LIBCPP_HAS_NO_CHAR8_T 680# endif 681 682// Deprecation macros. 683// 684// Deprecations warnings are always enabled, except when users explicitly opt-out 685// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS. 686# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 687# if __has_attribute(__deprecated__) 688# define _LIBCPP_DEPRECATED __attribute__((__deprecated__)) 689# define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m))) 690# elif _LIBCPP_STD_VER >= 14 691# define _LIBCPP_DEPRECATED [[deprecated]] 692# define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]] 693# else 694# define _LIBCPP_DEPRECATED 695# define _LIBCPP_DEPRECATED_(m) 696# endif 697# else 698# define _LIBCPP_DEPRECATED 699# define _LIBCPP_DEPRECATED_(m) 700# endif 701 702# if !defined(_LIBCPP_CXX03_LANG) 703# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED 704# else 705# define _LIBCPP_DEPRECATED_IN_CXX11 706# endif 707 708# if _LIBCPP_STD_VER >= 14 709# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED 710# else 711# define _LIBCPP_DEPRECATED_IN_CXX14 712# endif 713 714# if _LIBCPP_STD_VER >= 17 715# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED 716# else 717# define _LIBCPP_DEPRECATED_IN_CXX17 718# endif 719 720# if _LIBCPP_STD_VER >= 20 721# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED 722# else 723# define _LIBCPP_DEPRECATED_IN_CXX20 724# endif 725 726# if _LIBCPP_STD_VER >= 23 727# define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED 728# else 729# define _LIBCPP_DEPRECATED_IN_CXX23 730# endif 731 732# if _LIBCPP_STD_VER >= 26 733# define _LIBCPP_DEPRECATED_IN_CXX26 _LIBCPP_DEPRECATED 734# else 735# define _LIBCPP_DEPRECATED_IN_CXX26 736# endif 737 738# if !defined(_LIBCPP_HAS_NO_CHAR8_T) 739# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED 740# else 741# define _LIBCPP_DEPRECATED_WITH_CHAR8_T 742# endif 743 744// Macros to enter and leave a state where deprecation warnings are suppressed. 745# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC) 746# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \ 747 _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \ 748 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") 749# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop") 750# else 751# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH 752# define _LIBCPP_SUPPRESS_DEPRECATED_POP 753# endif 754 755# if _LIBCPP_STD_VER <= 11 756# define _LIBCPP_EXPLICIT_SINCE_CXX14 757# else 758# define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit 759# endif 760 761# if _LIBCPP_STD_VER >= 23 762# define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit 763# else 764# define _LIBCPP_EXPLICIT_SINCE_CXX23 765# endif 766 767# if _LIBCPP_STD_VER >= 14 768# define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr 769# else 770# define _LIBCPP_CONSTEXPR_SINCE_CXX14 771# endif 772 773# if _LIBCPP_STD_VER >= 17 774# define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr 775# else 776# define _LIBCPP_CONSTEXPR_SINCE_CXX17 777# endif 778 779# if _LIBCPP_STD_VER >= 20 780# define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr 781# else 782# define _LIBCPP_CONSTEXPR_SINCE_CXX20 783# endif 784 785# if _LIBCPP_STD_VER >= 23 786# define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr 787# else 788# define _LIBCPP_CONSTEXPR_SINCE_CXX23 789# endif 790 791# ifndef _LIBCPP_WEAK 792# define _LIBCPP_WEAK __attribute__((__weak__)) 793# endif 794 795// Thread API 796// clang-format off 797# if !defined(_LIBCPP_HAS_NO_THREADS) && \ 798 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \ 799 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \ 800 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 801 802# if defined(__FreeBSD__) || \ 803 defined(__wasi__) || \ 804 defined(__NetBSD__) || \ 805 defined(__OpenBSD__) || \ 806 defined(__NuttX__) || \ 807 defined(__linux__) || \ 808 defined(__GNU__) || \ 809 defined(__APPLE__) || \ 810 defined(__MVS__) || \ 811 defined(_AIX) || \ 812 defined(__EMSCRIPTEN__) 813// clang-format on 814# define _LIBCPP_HAS_THREAD_API_PTHREAD 815# elif defined(__Fuchsia__) 816// TODO(44575): Switch to C11 thread API when possible. 817# define _LIBCPP_HAS_THREAD_API_PTHREAD 818# elif defined(_LIBCPP_WIN32API) 819# define _LIBCPP_HAS_THREAD_API_WIN32 820# else 821# error "No thread API" 822# endif // _LIBCPP_HAS_THREAD_API 823# endif // _LIBCPP_HAS_NO_THREADS 824 825# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 826# if defined(__ANDROID__) && __ANDROID_API__ >= 30 827# define _LIBCPP_HAS_COND_CLOCKWAIT 828# elif defined(_LIBCPP_GLIBC_PREREQ) 829# if _LIBCPP_GLIBC_PREREQ(2, 30) 830# define _LIBCPP_HAS_COND_CLOCKWAIT 831# endif 832# endif 833# endif 834 835# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 836# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \ 837 _LIBCPP_HAS_NO_THREADS is not defined. 838# endif 839 840# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 841# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \ 842 _LIBCPP_HAS_NO_THREADS is defined. 843# endif 844 845# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS) 846# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \ 847 _LIBCPP_HAS_NO_THREADS is defined. 848# endif 849 850# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) 851# define __STDCPP_THREADS__ 1 852# endif 853 854// The glibc and Bionic implementation of pthreads implements 855// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32 856// mutexes have no destroy mechanism. 857// 858// This optimization can't be performed on Apple platforms, where 859// pthread_mutex_destroy can allow the kernel to release resources. 860// See https://llvm.org/D64298 for details. 861// 862// TODO(EricWF): Enable this optimization on Bionic after speaking to their 863// respective stakeholders. 864// clang-format off 865# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \ 866 (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \ 867 defined(_LIBCPP_HAS_THREAD_API_WIN32) 868// clang-format on 869# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 870# endif 871 872// Destroying a condvar is a nop on Windows. 873// 874// This optimization can't be performed on Apple platforms, where 875// pthread_cond_destroy can allow the kernel to release resources. 876// See https://llvm.org/D64298 for details. 877// 878// TODO(EricWF): This is potentially true for some pthread implementations 879// as well. 880# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32) 881# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 882# endif 883 884# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \ 885 defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__) 886# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE 887# endif 888 889# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic) 890# define _LIBCPP_HAS_C_ATOMIC_IMP 891# elif defined(_LIBCPP_COMPILER_GCC) 892# define _LIBCPP_HAS_GCC_ATOMIC_IMP 893# endif 894 895# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \ 896 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP) 897# define _LIBCPP_HAS_NO_ATOMIC_HEADER 898# else 899# ifndef _LIBCPP_ATOMIC_FLAG_TYPE 900# define _LIBCPP_ATOMIC_FLAG_TYPE bool 901# endif 902# endif 903 904# if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(__no_thread_safety_analysis__) 905# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((__no_thread_safety_analysis__)) 906# else 907# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS 908# endif 909 910# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) 911# if defined(__clang__) && __has_attribute(acquire_capability) 912// Work around the attribute handling in clang. When both __declspec and 913// __attribute__ are present, the processing goes awry preventing the definition 914// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus 915// combining the two does work. 916# if !defined(_MSC_VER) 917# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 918# endif 919# endif 920# endif 921 922# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 923# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x)) 924# else 925# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) 926# endif 927 928# if _LIBCPP_STD_VER >= 20 929# define _LIBCPP_CONSTINIT constinit 930# elif __has_attribute(__require_constant_initialization__) 931# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__)) 932# else 933# define _LIBCPP_CONSTINIT 934# endif 935 936# if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__) 937// The CUDA SDK contains an unfortunate definition for the __noinline__ macro, 938// which breaks the regular __attribute__((__noinline__)) syntax. Therefore, 939// when compiling for CUDA we use the non-underscored version of the noinline 940// attribute. 941// 942// This is a temporary workaround and we still expect the CUDA SDK team to solve 943// this issue properly in the SDK headers. 944// 945// See https://github.com/llvm/llvm-project/pull/73838 for more details. 946# define _LIBCPP_NOINLINE __attribute__((noinline)) 947# elif __has_attribute(__noinline__) 948# define _LIBCPP_NOINLINE __attribute__((__noinline__)) 949# else 950# define _LIBCPP_NOINLINE 951# endif 952 953// We often repeat things just for handling wide characters in the library. 954// When wide characters are disabled, it can be useful to have a quick way of 955// disabling it without having to resort to #if-#endif, which has a larger 956// impact on readability. 957# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) 958# define _LIBCPP_IF_WIDE_CHARACTERS(...) 959# else 960# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__ 961# endif 962 963// clang-format off 964# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")") 965# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")") 966// clang-format on 967 968# ifndef _LIBCPP_NO_AUTO_LINK 969# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 970# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 971# pragma comment(lib, "c++.lib") 972# else 973# pragma comment(lib, "libc++.lib") 974# endif 975# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 976# endif // _LIBCPP_NO_AUTO_LINK 977 978// Configures the fopen close-on-exec mode character, if any. This string will 979// be appended to any mode string used by fstream for fopen/fdopen. 980// 981// Not all platforms support this, but it helps avoid fd-leaks on platforms that 982// do. 983# if defined(__BIONIC__) 984# define _LIBCPP_FOPEN_CLOEXEC_MODE "e" 985# else 986# define _LIBCPP_FOPEN_CLOEXEC_MODE 987# endif 988 989# if __has_cpp_attribute(msvc::no_unique_address) 990// MSVC implements [[no_unique_address]] as a silent no-op currently. 991// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.) 992// However, MSVC implements [[msvc::no_unique_address]] which does what 993// [[no_unique_address]] is supposed to do, in general. 994 995// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or 996// [[msvc::no_unique_address]] though. If/when it does implement 997// [[msvc::no_unique_address]], this should be preferred though. 998# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]] 999# elif __has_cpp_attribute(no_unique_address) 1000# define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]] 1001# else 1002# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */ 1003// Note that this can be replaced by #error as soon as clang-cl 1004// implements msvc::no_unique_address, since there should be no C++20 1005// compiler that doesn't support one of the two attributes at that point. 1006// We generally don't want to use this macro outside of C++20-only code, 1007// because using it conditionally in one language version only would make 1008// the ABI inconsistent. 1009# endif 1010 1011// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these 1012// functions is gradually being added to existing C libraries. The conditions 1013// below check for known C library versions and conditions under which these 1014// functions are declared by the C library. 1015# define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 1016// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if 1017// __cpp_char8_t is defined or if C2X extensions are enabled. Determining 1018// the latter depends on internal GNU libc details that are not appropriate 1019// to depend on here, so any declarations present when __cpp_char8_t is not 1020// defined are ignored. 1021# if defined(_LIBCPP_GLIBC_PREREQ) 1022# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t) 1023# undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 1024# endif 1025# endif 1026 1027// There are a handful of public standard library types that are intended to 1028// support CTAD but don't need any explicit deduction guides to do so. This 1029// macro is used to mark them as such, which suppresses the 1030// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code 1031// with these classes. 1032# if _LIBCPP_STD_VER >= 17 1033# ifdef _LIBCPP_COMPILER_CLANG_BASED 1034# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) \ 1035 template <class... _Tag> \ 1036 [[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...> 1037# else 1038# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName) \ 1039 template <class... _Tag> \ 1040 ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...> 1041# endif 1042# else 1043# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "") 1044# endif 1045 1046// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use 1047// compiler intrinsics in the Objective-C++ mode. 1048# ifdef __OBJC__ 1049# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS 1050# endif 1051 1052# define _PSTL_PRAGMA(x) _Pragma(#x) 1053 1054// Enable SIMD for compilers that support OpenMP 4.0 1055# if (defined(_OPENMP) && _OPENMP >= 201307) 1056 1057# define _PSTL_UDR_PRESENT 1058# define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd) 1059# define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd) 1060# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM)) 1061# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM)) 1062# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM)) 1063# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM)) 1064 1065// Declaration of reduction functor, where 1066// NAME - the name of the functor 1067// OP - type of the callable object with the reduction operation 1068// omp_in - refers to the local partial result 1069// omp_out - refers to the final value of the combiner operator 1070// omp_priv - refers to the private copy of the initial value 1071// omp_orig - refers to the original variable to be reduced 1072# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) \ 1073 _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig)) 1074 1075# elif defined(_LIBCPP_COMPILER_CLANG_BASED) 1076 1077# define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)") 1078# define _PSTL_PRAGMA_DECLARE_SIMD 1079# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)") 1080# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)") 1081# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 1082# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 1083# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) 1084 1085# else // (defined(_OPENMP) && _OPENMP >= 201307) 1086 1087# define _PSTL_PRAGMA_SIMD 1088# define _PSTL_PRAGMA_DECLARE_SIMD 1089# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) 1090# define _PSTL_PRAGMA_SIMD_SCAN(PRM) 1091# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 1092# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 1093# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) 1094 1095# endif // (defined(_OPENMP) && _OPENMP >= 201307) 1096 1097# define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED 1098 1099// Optional attributes - these are useful for a better QoI, but not required to be available 1100 1101# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC) 1102# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi"))) 1103# else 1104# define _LIBCPP_NO_CFI 1105# endif 1106 1107# if __has_attribute(__malloc__) 1108# define _LIBCPP_NOALIAS __attribute__((__malloc__)) 1109# else 1110# define _LIBCPP_NOALIAS 1111# endif 1112 1113# if __has_attribute(__using_if_exists__) 1114# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__)) 1115# else 1116# define _LIBCPP_USING_IF_EXISTS 1117# endif 1118 1119# if __has_cpp_attribute(__nodiscard__) 1120# define _LIBCPP_NODISCARD [[__nodiscard__]] 1121# else 1122// We can't use GCC's [[gnu::warn_unused_result]] and 1123// __attribute__((warn_unused_result)), because GCC does not silence them via 1124// (void) cast. 1125# define _LIBCPP_NODISCARD 1126# endif 1127 1128# if __has_attribute(__no_destroy__) 1129# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__)) 1130# else 1131# define _LIBCPP_NO_DESTROY 1132# endif 1133 1134# if __has_attribute(__diagnose_if__) 1135# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning"))) 1136# else 1137# define _LIBCPP_DIAGNOSE_WARNING(...) 1138# endif 1139 1140// Use a function like macro to imply that it must be followed by a semicolon 1141# if __has_cpp_attribute(fallthrough) 1142# define _LIBCPP_FALLTHROUGH() [[fallthrough]] 1143# elif __has_attribute(__fallthrough__) 1144# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__)) 1145# else 1146# define _LIBCPP_FALLTHROUGH() ((void)0) 1147# endif 1148 1149# if __has_cpp_attribute(_Clang::__lifetimebound__) 1150# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]] 1151# else 1152# define _LIBCPP_LIFETIMEBOUND 1153# endif 1154 1155# if __has_attribute(__nodebug__) 1156# define _LIBCPP_NODEBUG __attribute__((__nodebug__)) 1157# else 1158# define _LIBCPP_NODEBUG 1159# endif 1160 1161# if __has_attribute(__standalone_debug__) 1162# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__)) 1163# else 1164# define _LIBCPP_STANDALONE_DEBUG 1165# endif 1166 1167# if __has_attribute(__preferred_name__) 1168# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x))) 1169# else 1170# define _LIBCPP_PREFERRED_NAME(x) 1171# endif 1172 1173# if __has_attribute(__no_sanitize__) 1174# define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__))) 1175# else 1176# define _LIBCPP_NO_SANITIZE(...) 1177# endif 1178 1179# if __has_attribute(__init_priority__) 1180# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100))) 1181# else 1182# define _LIBCPP_INIT_PRIORITY_MAX 1183# endif 1184 1185# if __has_attribute(__format__) 1186// The attribute uses 1-based indices for ordinary and static member functions. 1187// The attribute uses 2-based indices for non-static member functions. 1188# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \ 1189 __attribute__((__format__(archetype, format_string_index, first_format_arg_index))) 1190# else 1191# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */ 1192# endif 1193 1194# if __has_attribute(__packed__) 1195# define _LIBCPP_PACKED __attribute__((__packed__)) 1196# else 1197# define _LIBCPP_PACKED 1198# endif 1199 1200# if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases) 1201# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases) 1202# else 1203# define _LIBCPP_DECLSPEC_EMPTY_BASES 1204# endif 1205 1206// Allow for build-time disabling of unsigned integer sanitization 1207# if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC) 1208# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow"))) 1209# else 1210# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1211# endif 1212 1213// Clang-18 has support for deducing this, but it does not set the FTM. 1214# if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800) 1215# define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 1216# endif 1217 1218#endif // __cplusplus 1219 1220#endif // _LIBCPP___CONFIG 1221