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 15#if defined(_MSC_VER) && !defined(__clang__) 16# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17# define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER 18# endif 19#endif 20 21#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER 22# pragma GCC system_header 23#endif 24 25#if defined(__apple_build_version__) 26// Given AppleClang XX.Y.Z, _LIBCPP_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403) 27# define _LIBCPP_COMPILER_CLANG_BASED 28# define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000) 29#elif defined(__clang__) 30# define _LIBCPP_COMPILER_CLANG_BASED 31# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__) 32#elif defined(__GNUC__) 33# define _LIBCPP_COMPILER_GCC 34#endif 35 36#ifdef __cplusplus 37 38// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM. 39// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 16.0.1 == 16.00.01), _LIBCPP_VERSION is 40// defined to XXYYZZ. 41# define _LIBCPP_VERSION 160006 42 43# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y 44# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y) 45 46// Valid C++ identifier that revs with every libc++ version. This can be used to 47// generate identifiers that must be unique for every released libc++ version. 48# define _LIBCPP_VERSIONED_IDENTIFIER _LIBCPP_CONCAT(v, _LIBCPP_VERSION) 49 50# if __STDC_HOSTED__ == 0 51# define _LIBCPP_FREESTANDING 52# endif 53 54# ifndef _LIBCPP_STD_VER 55# if __cplusplus <= 201103L 56# define _LIBCPP_STD_VER 11 57# elif __cplusplus <= 201402L 58# define _LIBCPP_STD_VER 14 59# elif __cplusplus <= 201703L 60# define _LIBCPP_STD_VER 17 61# elif __cplusplus <= 202002L 62# define _LIBCPP_STD_VER 20 63# else 64// Expected release year of the next C++ standard 65# define _LIBCPP_STD_VER 23 66# endif 67# endif // _LIBCPP_STD_VER 68 69# if defined(__ELF__) 70# define _LIBCPP_OBJECT_FORMAT_ELF 1 71# elif defined(__MACH__) 72# define _LIBCPP_OBJECT_FORMAT_MACHO 1 73# elif defined(_WIN32) 74# define _LIBCPP_OBJECT_FORMAT_COFF 1 75# elif defined(__wasm__) 76# define _LIBCPP_OBJECT_FORMAT_WASM 1 77# elif defined(_AIX) 78# define _LIBCPP_OBJECT_FORMAT_XCOFF 1 79# else 80// ... add new file formats here ... 81# endif 82 83# if _LIBCPP_ABI_VERSION >= 2 84// Change short string representation so that string data starts at offset 0, 85// improving its alignment in some cases. 86# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 87// Fix deque iterator type in order to support incomplete types. 88# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE 89// Fix undefined behavior in how std::list stores its linked nodes. 90# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB 91// Fix undefined behavior in how __tree stores its end and parent nodes. 92# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB 93// Fix undefined behavior in how __hash_table stores its pointer types. 94# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB 95# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB 96# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE 97// Define a key function for `bad_function_call` in the library, to centralize 98// its vtable and typeinfo to libc++ rather than having all other libraries 99// using that class define their own copies. 100# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 101// Override the default return value of exception::what() for 102// bad_function_call::what() with a string that is specific to 103// bad_function_call (see http://wg21.link/LWG2233). This is an ABI break 104// because it changes the vtable layout of bad_function_call. 105# define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE 106// Enable optimized version of __do_get_(un)signed which avoids redundant copies. 107# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET 108// Give reverse_iterator<T> one data member of type T, not two. 109// Also, in C++17 and later, don't derive iterator types from std::iterator. 110# define _LIBCPP_ABI_NO_ITERATOR_BASES 111// Use the smallest possible integer type to represent the index of the variant. 112// Previously libc++ used "unsigned int" exclusively. 113# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION 114// Unstable attempt to provide a more optimized std::function 115# define _LIBCPP_ABI_OPTIMIZED_FUNCTION 116// All the regex constants must be distinct and nonzero. 117# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO 118// Re-worked external template instantiations for std::string with a focus on 119// performance and fast-path inlining. 120# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION 121// Enable clang::trivial_abi on std::unique_ptr. 122# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI 123// Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr 124# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI 125// std::random_device holds some state when it uses an implementation that gets 126// entropy from a file (see _LIBCPP_USING_DEV_RANDOM). When switching from this 127// implementation to another one on a platform that has already shipped 128// std::random_device, one needs to retain the same object layout to remain ABI 129// compatible. This switch removes these workarounds for platforms that don't care 130// about ABI compatibility. 131# define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT 132// Don't export the legacy __basic_string_common class and its methods from the built library. 133# define _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON 134// Don't export the legacy __vector_base_common class and its methods from the built library. 135# define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON 136// According to the Standard, `bitset::operator[] const` returns bool 137# define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL 138// Fix the implementation of CityHash used for std::hash<fundamental-type>. 139// This is an ABI break because `std::hash` will return a different result, 140// which means that hashing the same object in translation units built against 141// different versions of libc++ can return inconsistent results. This is especially 142// tricky since std::hash is used in the implementation of unordered containers. 143// 144// The incorrect implementation of CityHash has the problem that it drops some 145// bits on the floor. 146# define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION 147// Remove the base 10 implementation of std::to_chars from the dylib. 148// The implementation moved to the header, but we still export the symbols from 149// the dylib for backwards compatibility. 150# define _LIBCPP_ABI_DO_NOT_EXPORT_TO_CHARS_BASE_10 151# elif _LIBCPP_ABI_VERSION == 1 152# if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF)) 153// Enable compiling copies of now inline methods into the dylib to support 154// applications compiled against older libraries. This is unnecessary with 155// COFF dllexport semantics, since dllexport forces a non-inline definition 156// of inline functions to be emitted anyway. Our own non-inline copy would 157// conflict with the dllexport-emitted copy, so we disable it. For XCOFF, 158// the linker will take issue with the symbols in the shared object if the 159// weak inline methods get visibility (such as from -fvisibility-inlines-hidden), 160// so disable it. 161# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS 162# endif 163// Feature macros for disabling pre ABI v1 features. All of these options 164// are deprecated. 165# if defined(__FreeBSD__) 166# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR 167# endif 168# endif 169 170# if defined(_LIBCPP_BUILDING_LIBRARY) || _LIBCPP_ABI_VERSION >= 2 171// Enable additional explicit instantiations of iostreams components. This 172// reduces the number of weak definitions generated in programs that use 173// iostreams by providing a single strong definition in the shared library. 174# define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 175 176// Define a key function for `bad_function_call` in the library, to centralize 177// its vtable and typeinfo to libc++ rather than having all other libraries 178// using that class define their own copies. 179# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 180# endif 181 182# define _LIBCPP_TOSTRING2(x) #x 183# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x) 184 185# if __cplusplus < 201103L 186# define _LIBCPP_CXX03_LANG 187# endif 188 189# ifndef __has_attribute 190# define __has_attribute(__x) 0 191# endif 192 193# ifndef __has_builtin 194# define __has_builtin(__x) 0 195# endif 196 197# ifndef __has_extension 198# define __has_extension(__x) 0 199# endif 200 201# ifndef __has_feature 202# define __has_feature(__x) 0 203# endif 204 205# ifndef __has_cpp_attribute 206# define __has_cpp_attribute(__x) 0 207# endif 208 209# ifndef __has_constexpr_builtin 210# define __has_constexpr_builtin(x) 0 211# endif 212 213// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by 214// the compiler and '1' otherwise. 215# ifndef __is_identifier 216# define __is_identifier(__x) 1 217# endif 218 219# ifndef __has_declspec_attribute 220# define __has_declspec_attribute(__x) 0 221# endif 222 223# define __has_keyword(__x) !(__is_identifier(__x)) 224 225# ifndef __has_include 226# define __has_include(...) 0 227# endif 228 229# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L 230# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11" 231# endif 232 233// FIXME: ABI detection should be done via compiler builtin macros. This 234// is just a placeholder until Clang implements such macros. For now assume 235// that Windows compilers pretending to be MSVC++ target the Microsoft ABI, 236// and allow the user to explicitly specify the ABI to handle cases where this 237// heuristic falls short. 238# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT) 239# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined" 240# elif defined(_LIBCPP_ABI_FORCE_ITANIUM) 241# define _LIBCPP_ABI_ITANIUM 242# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT) 243# define _LIBCPP_ABI_MICROSOFT 244# else 245# if defined(_WIN32) && defined(_MSC_VER) 246# define _LIBCPP_ABI_MICROSOFT 247# else 248# define _LIBCPP_ABI_ITANIUM 249# endif 250# endif 251 252# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 253# define _LIBCPP_ABI_VCRUNTIME 254# endif 255 256# if __has_feature(experimental_library) 257# ifndef _LIBCPP_ENABLE_EXPERIMENTAL 258# define _LIBCPP_ENABLE_EXPERIMENTAL 259# endif 260# endif 261 262// Incomplete features get their own specific disabling flags. This makes it 263// easier to grep for target specific flags once the feature is complete. 264# if !defined(_LIBCPP_ENABLE_EXPERIMENTAL) && !defined(_LIBCPP_BUILDING_LIBRARY) 265# define _LIBCPP_HAS_NO_INCOMPLETE_FORMAT 266# endif 267 268// Need to detect which libc we're using if we're on Linux. 269# if defined(__linux__) 270# include <features.h> 271# if defined(__GLIBC_PREREQ) 272# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b) 273# else 274# define _LIBCPP_GLIBC_PREREQ(a, b) 0 275# endif // defined(__GLIBC_PREREQ) 276# endif // defined(__linux__) 277 278# if defined(__MVS__) 279# include <features.h> // for __NATIVE_ASCII_F 280# endif 281 282# ifdef __LITTLE_ENDIAN__ 283# if __LITTLE_ENDIAN__ 284# define _LIBCPP_LITTLE_ENDIAN 285# endif // __LITTLE_ENDIAN__ 286# endif // __LITTLE_ENDIAN__ 287 288# ifdef __BIG_ENDIAN__ 289# if __BIG_ENDIAN__ 290# define _LIBCPP_BIG_ENDIAN 291# endif // __BIG_ENDIAN__ 292# endif // __BIG_ENDIAN__ 293 294# ifdef __BYTE_ORDER__ 295# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 296# define _LIBCPP_LITTLE_ENDIAN 297# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 298# define _LIBCPP_BIG_ENDIAN 299# endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 300# endif // __BYTE_ORDER__ 301 302# ifdef __FreeBSD__ 303# include <sys/endian.h> 304# include <osreldate.h> 305# if _BYTE_ORDER == _LITTLE_ENDIAN 306# define _LIBCPP_LITTLE_ENDIAN 307# else // _BYTE_ORDER == _LITTLE_ENDIAN 308# define _LIBCPP_BIG_ENDIAN 309# endif // _BYTE_ORDER == _LITTLE_ENDIAN 310# endif // __FreeBSD__ 311 312# if defined(__NetBSD__) || defined(__OpenBSD__) 313# include <sys/endian.h> 314# if _BYTE_ORDER == _LITTLE_ENDIAN 315# define _LIBCPP_LITTLE_ENDIAN 316# else // _BYTE_ORDER == _LITTLE_ENDIAN 317# define _LIBCPP_BIG_ENDIAN 318# endif // _BYTE_ORDER == _LITTLE_ENDIAN 319# endif // defined(__NetBSD__) || defined(__OpenBSD__) 320 321# if defined(_WIN32) 322# define _LIBCPP_WIN32API 323# define _LIBCPP_LITTLE_ENDIAN 324# define _LIBCPP_SHORT_WCHAR 1 325// Both MinGW and native MSVC provide a "MSVC"-like environment 326# define _LIBCPP_MSVCRT_LIKE 327// If mingw not explicitly detected, assume using MS C runtime only if 328// a MS compatibility version is specified. 329# if defined(_MSC_VER) && !defined(__MINGW32__) 330# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library 331# endif 332# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__)) 333# define _LIBCPP_HAS_BITSCAN64 334# endif 335# define _LIBCPP_HAS_OPEN_WITH_WCHAR 336# endif // defined(_WIN32) 337 338# ifdef __sun__ 339# include <sys/isa_defs.h> 340# ifdef _LITTLE_ENDIAN 341# define _LIBCPP_LITTLE_ENDIAN 342# else 343# define _LIBCPP_BIG_ENDIAN 344# endif 345# endif // __sun__ 346 347# if defined(_AIX) && !defined(__64BIT__) 348// The size of wchar is 2 byte on 32-bit mode on AIX. 349# define _LIBCPP_SHORT_WCHAR 1 350# endif 351 352// Libc++ supports various implementations of std::random_device. 353// 354// _LIBCPP_USING_DEV_RANDOM 355// Read entropy from the given file, by default `/dev/urandom`. 356// If a token is provided, it is assumed to be the path to a file 357// to read entropy from. This is the default behavior if nothing 358// else is specified. This implementation requires storing state 359// inside `std::random_device`. 360// 361// _LIBCPP_USING_ARC4_RANDOM 362// Use arc4random(). This allows obtaining random data even when 363// using sandboxing mechanisms. On some platforms like Apple, this 364// is the recommended source of entropy for user-space programs. 365// When this option is used, the token passed to `std::random_device`'s 366// constructor *must* be "/dev/urandom" -- anything else is an error. 367// 368// _LIBCPP_USING_GETENTROPY 369// Use getentropy(). 370// When this option is used, the token passed to `std::random_device`'s 371// constructor *must* be "/dev/urandom" -- anything else is an error. 372// 373// _LIBCPP_USING_FUCHSIA_CPRNG 374// Use Fuchsia's zx_cprng_draw() system call, which is specified to 375// deliver high-quality entropy and cannot fail. 376// When this option is used, the token passed to `std::random_device`'s 377// constructor *must* be "/dev/urandom" -- anything else is an error. 378// 379// _LIBCPP_USING_NACL_RANDOM 380// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access, 381// including accesses to the special files under `/dev`. This implementation 382// uses the NaCL syscall `nacl_secure_random_init()` to get entropy. 383// When this option is used, the token passed to `std::random_device`'s 384// constructor *must* be "/dev/urandom" -- anything else is an error. 385// 386// _LIBCPP_USING_WIN32_RANDOM 387// Use rand_s(), for use on Windows. 388// When this option is used, the token passed to `std::random_device`'s 389// constructor *must* be "/dev/urandom" -- anything else is an error. 390# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \ 391 defined(__DragonFly__) || defined(__sun__) 392# define _LIBCPP_USING_ARC4_RANDOM 393# elif defined(__wasi__) || defined(__EMSCRIPTEN__) 394# define _LIBCPP_USING_GETENTROPY 395# elif defined(__Fuchsia__) 396# define _LIBCPP_USING_FUCHSIA_CPRNG 397# elif defined(__native_client__) 398# define _LIBCPP_USING_NACL_RANDOM 399# elif defined(_LIBCPP_WIN32API) 400# define _LIBCPP_USING_WIN32_RANDOM 401# else 402# define _LIBCPP_USING_DEV_RANDOM 403# endif 404 405# if !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN) 406# include <endian.h> 407# if __BYTE_ORDER == __LITTLE_ENDIAN 408# define _LIBCPP_LITTLE_ENDIAN 409# elif __BYTE_ORDER == __BIG_ENDIAN 410# define _LIBCPP_BIG_ENDIAN 411# else // __BYTE_ORDER == __BIG_ENDIAN 412# error unable to determine endian 413# endif 414# endif // !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN) 415 416# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC) 417# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi"))) 418# else 419# define _LIBCPP_NO_CFI 420# endif 421 422# ifndef _LIBCPP_CXX03_LANG 423 424# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp) 425# define _ALIGNAS_TYPE(x) alignas(x) 426# define _ALIGNAS(x) alignas(x) 427# define _LIBCPP_NORETURN [[noreturn]] 428# define _NOEXCEPT noexcept 429# define _NOEXCEPT_(x) noexcept(x) 430# define _LIBCPP_CONSTEXPR constexpr 431 432# else 433 434# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp) 435# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 436# define _ALIGNAS(x) __attribute__((__aligned__(x))) 437# define _LIBCPP_NORETURN __attribute__((__noreturn__)) 438# define _LIBCPP_HAS_NO_NOEXCEPT 439# define nullptr __nullptr 440# define _NOEXCEPT throw() 441# define _NOEXCEPT_(x) 442# define static_assert(...) _Static_assert(__VA_ARGS__) 443# define decltype(...) __decltype(__VA_ARGS__) 444# define _LIBCPP_CONSTEXPR 445 446typedef __char16_t char16_t; 447typedef __char32_t char32_t; 448 449# endif 450 451# if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L 452# define _LIBCPP_NO_EXCEPTIONS 453# endif 454 455# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp) 456 457# if defined(_LIBCPP_COMPILER_CLANG_BASED) 458 459# if defined(__APPLE__) && !defined(__i386__) && !defined(__x86_64__) && (!defined(__arm__) || __ARM_ARCH_7K__ >= 2) 460# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 461# endif 462 463// Objective-C++ features (opt-in) 464# if __has_feature(objc_arc) 465# define _LIBCPP_HAS_OBJC_ARC 466# endif 467 468# if __has_feature(objc_arc_weak) 469# define _LIBCPP_HAS_OBJC_ARC_WEAK 470# endif 471 472# if __has_extension(blocks) 473# define _LIBCPP_HAS_EXTENSION_BLOCKS 474# endif 475 476# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__) 477# define _LIBCPP_HAS_BLOCKS_RUNTIME 478# endif 479 480# if !__has_feature(address_sanitizer) 481# define _LIBCPP_HAS_NO_ASAN 482# endif 483 484// Allow for build-time disabling of unsigned integer sanitization 485# if __has_attribute(no_sanitize) 486# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow"))) 487# endif 488 489# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 490 491# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 492 493# elif defined(_LIBCPP_COMPILER_GCC) 494 495# if !defined(__SANITIZE_ADDRESS__) 496# define _LIBCPP_HAS_NO_ASAN 497# endif 498 499# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 500 501# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 502 503# endif // _LIBCPP_COMPILER_[CLANG|GCC] 504 505# if defined(_LIBCPP_OBJECT_FORMAT_COFF) 506 507# ifdef _DLL 508# define _LIBCPP_CRT_FUNC __declspec(dllimport) 509# else 510# define _LIBCPP_CRT_FUNC 511# endif 512 513# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY)) 514# define _LIBCPP_DLL_VIS 515# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 516# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 517# define _LIBCPP_OVERRIDABLE_FUNC_VIS 518# define _LIBCPP_EXPORTED_FROM_ABI 519# elif defined(_LIBCPP_BUILDING_LIBRARY) 520# define _LIBCPP_DLL_VIS __declspec(dllexport) 521# if defined(__MINGW32__) 522# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 523# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 524# else 525# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 526# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS 527# endif 528# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS 529# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport) 530# else 531# define _LIBCPP_DLL_VIS __declspec(dllimport) 532# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 533# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 534# define _LIBCPP_OVERRIDABLE_FUNC_VIS 535# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport) 536# endif 537 538# define _LIBCPP_TYPE_VIS _LIBCPP_DLL_VIS 539# define _LIBCPP_FUNC_VIS _LIBCPP_DLL_VIS 540# define _LIBCPP_EXCEPTION_ABI _LIBCPP_DLL_VIS 541# define _LIBCPP_HIDDEN 542# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 543# define _LIBCPP_TEMPLATE_VIS 544# define _LIBCPP_TEMPLATE_DATA_VIS 545# define _LIBCPP_ENUM_VIS 546 547# else 548 549# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 550# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis))) 551# else 552# define _LIBCPP_VISIBILITY(vis) 553# endif 554 555# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden") 556# define _LIBCPP_FUNC_VIS _LIBCPP_VISIBILITY("default") 557# define _LIBCPP_TYPE_VIS _LIBCPP_VISIBILITY("default") 558# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default") 559# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default") 560# define _LIBCPP_EXCEPTION_ABI _LIBCPP_VISIBILITY("default") 561# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default") 562# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 563 564// TODO: Make this a proper customization point or remove the option to override it. 565# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS 566# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default") 567# endif 568 569# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 570// The inline should be removed once PR32114 is resolved 571# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN 572# else 573# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 574# endif 575 576# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 577# if __has_attribute(__type_visibility__) 578# define _LIBCPP_TEMPLATE_VIS __attribute__((__type_visibility__("default"))) 579# else 580# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default"))) 581# endif 582# else 583# define _LIBCPP_TEMPLATE_VIS 584# endif 585 586# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) 587# define _LIBCPP_ENUM_VIS __attribute__((__type_visibility__("default"))) 588# else 589# define _LIBCPP_ENUM_VIS 590# endif 591 592# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF) 593 594# if __has_attribute(exclude_from_explicit_instantiation) 595# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__)) 596# else 597// Try to approximate the effect of exclude_from_explicit_instantiation 598// (which is that entities are not assumed to be provided by explicit 599// template instantiations in the dylib) by always inlining those entities. 600# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE 601# endif 602 603// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved 604// on two levels: 605// 1. The symbol is given hidden visibility, which ensures that users won't start exporting 606// symbols from their dynamic library by means of using the libc++ headers. This ensures 607// that those symbols stay private to the dynamic library in which it is defined. 608// 609// 2. The symbol is given an ABI tag that changes with each version of libc++. This ensures 610// that no ODR violation can arise from mixing two TUs compiled with different versions 611// of libc++ where we would have changed the definition of a symbol. If the symbols shared 612// the same name, the ODR would require that their definitions be token-by-token equivalent, 613// which basically prevents us from being able to make any change to any function in our 614// headers. Using this ABI tag ensures that the symbol name is "bumped" artificially at 615// each release, which lets us change the definition of these symbols at our leisure. 616// Note that historically, this has been achieved in various ways, including force-inlining 617// all functions or giving internal linkage to all functions. Both these (previous) solutions 618// suffer from drawbacks that lead notably to code bloat. 619// 620// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend 621// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library. 622// 623// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions 624// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled 625// name of a virtual function is part of its ABI, since some architectures like arm64e can sign 626// the virtual function pointer in the vtable based on the mangled name of the function. Since 627// we use an ABI tag that changes with each released version, the mangled name of the virtual 628// function would change, which is incorrect. Note that it doesn't make much sense to change 629// the implementation of a virtual function in an ABI-incompatible way in the first place, 630// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable. 631// 632// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing 633// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and 634// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70. 635# ifndef _LIBCPP_NO_ABI_TAG 636# define _LIBCPP_HIDE_FROM_ABI \ 637 _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \ 638 __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_VERSIONED_IDENTIFIER)))) 639# else 640# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 641# endif 642# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 643 644// This macro provides a HIDE_FROM_ABI equivalent that can be applied to extern 645// "C" function, as those lack mangling. 646# define _LIBCPP_HIDE_FROM_ABI_C _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 647 648# ifdef _LIBCPP_BUILDING_LIBRARY 649# if _LIBCPP_ABI_VERSION > 1 650# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 651# else 652# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 653# endif 654# else 655# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 656# endif 657 658// Just so we can migrate to the new macros gradually. 659# define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI 660 661// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect. 662// clang-format off 663# define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { inline namespace _LIBCPP_ABI_NAMESPACE { 664# define _LIBCPP_END_NAMESPACE_STD }} 665# define _VSTD std 666 667_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD 668 669# if _LIBCPP_STD_VER > 14 670# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \ 671 _LIBCPP_BEGIN_NAMESPACE_STD inline namespace __fs { namespace filesystem { 672# else 673# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \ 674 _LIBCPP_BEGIN_NAMESPACE_STD namespace __fs { namespace filesystem { 675# endif 676 677# define _LIBCPP_END_NAMESPACE_FILESYSTEM _LIBCPP_END_NAMESPACE_STD }} 678// clang-format on 679 680# define _VSTD_FS std::__fs::filesystem 681 682# if __has_attribute(__enable_if__) 683# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, ""))) 684# endif 685 686# ifndef __SIZEOF_INT128__ 687# define _LIBCPP_HAS_NO_INT128 688# endif 689 690# ifndef __cpp_consteval 691# define _LIBCPP_CONSTEVAL _LIBCPP_CONSTEXPR 692# else 693# define _LIBCPP_CONSTEVAL consteval 694# endif 695 696# if __has_attribute(__malloc__) 697# define _LIBCPP_NOALIAS __attribute__((__malloc__)) 698# else 699# define _LIBCPP_NOALIAS 700# endif 701 702# if __has_attribute(__using_if_exists__) 703# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__)) 704# else 705# define _LIBCPP_USING_IF_EXISTS 706# endif 707 708# ifdef _LIBCPP_CXX03_LANG 709# define _LIBCPP_DECLARE_STRONG_ENUM(x) \ 710 struct _LIBCPP_TYPE_VIS x { \ 711 enum __lx 712// clang-format off 713# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \ 714 __lx __v_; \ 715 _LIBCPP_INLINE_VISIBILITY x(__lx __v) : __v_(__v) {} \ 716 _LIBCPP_INLINE_VISIBILITY explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \ 717 _LIBCPP_INLINE_VISIBILITY operator int() const { return __v_; } \ 718 }; 719// clang-format on 720 721# else // _LIBCPP_CXX03_LANG 722# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_ENUM_VIS x 723# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) 724# endif // _LIBCPP_CXX03_LANG 725 726# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__sun__) || \ 727 defined(__NetBSD__) 728# define _LIBCPP_LOCALE__L_EXTENSIONS 1 729# endif 730 731# ifdef __FreeBSD__ 732# define _DECLARE_C99_LDBL_MATH 1 733# endif 734 735// If we are getting operator new from the MSVC CRT, then allocation overloads 736// for align_val_t were added in 19.12, aka VS 2017 version 15.3. 737# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912 738# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 739# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new) 740// We're deferring to Microsoft's STL to provide aligned new et al. We don't 741// have it unless the language feature test macro is defined. 742# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 743# elif defined(__MVS__) 744# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 745# endif 746 747# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606) 748# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 749# endif 750 751// It is not yet possible to use aligned_alloc() on all Apple platforms since 752// 10.15 was the first version to ship an implementation of aligned_alloc(). 753# if defined(__APPLE__) 754# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 755 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) 756# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 757# endif 758# elif defined(__ANDROID__) && __ANDROID_API__ < 28 759// Android only provides aligned_alloc when targeting API 28 or higher. 760# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 761# endif 762 763# if defined(__APPLE__) || defined(__FreeBSD__) 764# define _LIBCPP_HAS_DEFAULTRUNELOCALE 765# endif 766 767# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__) 768# define _LIBCPP_WCTYPE_IS_MASK 769# endif 770 771# if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t) 772# define _LIBCPP_HAS_NO_CHAR8_T 773# endif 774 775// Deprecation macros. 776// 777// Deprecations warnings are always enabled, except when users explicitly opt-out 778// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS. 779# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 780# if __has_attribute(deprecated) 781# define _LIBCPP_DEPRECATED __attribute__((deprecated)) 782# define _LIBCPP_DEPRECATED_(m) __attribute__((deprecated(m))) 783# elif _LIBCPP_STD_VER > 11 784# define _LIBCPP_DEPRECATED [[deprecated]] 785# define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]] 786# else 787# define _LIBCPP_DEPRECATED 788# define _LIBCPP_DEPRECATED_(m) 789# endif 790# else 791# define _LIBCPP_DEPRECATED 792# define _LIBCPP_DEPRECATED_(m) 793# endif 794 795# if !defined(_LIBCPP_CXX03_LANG) 796# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED 797# else 798# define _LIBCPP_DEPRECATED_IN_CXX11 799# endif 800 801# if _LIBCPP_STD_VER > 11 802# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED 803# else 804# define _LIBCPP_DEPRECATED_IN_CXX14 805# endif 806 807# if _LIBCPP_STD_VER > 14 808# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED 809# else 810# define _LIBCPP_DEPRECATED_IN_CXX17 811# endif 812 813# if _LIBCPP_STD_VER > 17 814# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED 815# else 816# define _LIBCPP_DEPRECATED_IN_CXX20 817# endif 818 819#if _LIBCPP_STD_VER >= 23 820# define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED 821#else 822# define _LIBCPP_DEPRECATED_IN_CXX23 823#endif 824 825# if !defined(_LIBCPP_HAS_NO_CHAR8_T) 826# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED 827# else 828# define _LIBCPP_DEPRECATED_WITH_CHAR8_T 829# endif 830 831// Macros to enter and leave a state where deprecation warnings are suppressed. 832# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC) 833# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \ 834 _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \ 835 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") 836# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop") 837# else 838# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH 839# define _LIBCPP_SUPPRESS_DEPRECATED_POP 840# endif 841 842# if _LIBCPP_STD_VER <= 11 843# define _LIBCPP_EXPLICIT_AFTER_CXX11 844# else 845# define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit 846# endif 847 848# if _LIBCPP_STD_VER > 11 849# define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr 850# else 851# define _LIBCPP_CONSTEXPR_SINCE_CXX14 852# endif 853 854# if _LIBCPP_STD_VER > 14 855# define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr 856# else 857# define _LIBCPP_CONSTEXPR_SINCE_CXX17 858# endif 859 860# if _LIBCPP_STD_VER > 17 861# define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr 862# else 863# define _LIBCPP_CONSTEXPR_SINCE_CXX20 864# endif 865 866# if _LIBCPP_STD_VER > 20 867# define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr 868# else 869# define _LIBCPP_CONSTEXPR_SINCE_CXX23 870# endif 871 872# if __has_cpp_attribute(nodiscard) 873# define _LIBCPP_NODISCARD [[nodiscard]] 874# else 875// We can't use GCC's [[gnu::warn_unused_result]] and 876// __attribute__((warn_unused_result)), because GCC does not silence them via 877// (void) cast. 878# define _LIBCPP_NODISCARD 879# endif 880 881// _LIBCPP_NODISCARD_EXT may be used to apply [[nodiscard]] to entities not 882// specified as such as an extension. 883# if !defined(_LIBCPP_DISABLE_NODISCARD_EXT) 884# define _LIBCPP_NODISCARD_EXT _LIBCPP_NODISCARD 885# else 886# define _LIBCPP_NODISCARD_EXT 887# endif 888 889# if _LIBCPP_STD_VER > 17 || !defined(_LIBCPP_DISABLE_NODISCARD_EXT) 890# define _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_NODISCARD 891# else 892# define _LIBCPP_NODISCARD_AFTER_CXX17 893# endif 894 895# if __has_attribute(__no_destroy__) 896# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__)) 897# else 898# define _LIBCPP_NO_DESTROY 899# endif 900 901# ifndef _LIBCPP_HAS_NO_ASAN 902 extern "C" _LIBCPP_FUNC_VIS void 903 __sanitizer_annotate_contiguous_container(const void*, const void*, const void*, const void*); 904# endif 905 906// Try to find out if RTTI is disabled. 907# if !defined(__cpp_rtti) || __cpp_rtti < 199711L 908# define _LIBCPP_HAS_NO_RTTI 909# endif 910 911# ifndef _LIBCPP_WEAK 912# define _LIBCPP_WEAK __attribute__((__weak__)) 913# endif 914 915// Thread API 916// clang-format off 917# if !defined(_LIBCPP_HAS_NO_THREADS) && \ 918 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \ 919 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \ 920 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 921 922# if defined(__FreeBSD__) || \ 923 defined(__wasi__) || \ 924 defined(__NetBSD__) || \ 925 defined(__OpenBSD__) || \ 926 defined(__NuttX__) || \ 927 defined(__linux__) || \ 928 defined(__GNU__) || \ 929 defined(__APPLE__) || \ 930 defined(__sun__) || \ 931 defined(__MVS__) || \ 932 defined(_AIX) || \ 933 defined(__EMSCRIPTEN__) 934// clang-format on 935# define _LIBCPP_HAS_THREAD_API_PTHREAD 936# elif defined(__Fuchsia__) 937// TODO(44575): Switch to C11 thread API when possible. 938# define _LIBCPP_HAS_THREAD_API_PTHREAD 939# elif defined(_LIBCPP_WIN32API) 940# define _LIBCPP_HAS_THREAD_API_WIN32 941# else 942# error "No thread API" 943# endif // _LIBCPP_HAS_THREAD_API 944# endif // _LIBCPP_HAS_NO_THREADS 945 946# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 947# if defined(__ANDROID__) && __ANDROID_API__ >= 30 948# define _LIBCPP_HAS_COND_CLOCKWAIT 949# elif defined(_LIBCPP_GLIBC_PREREQ) 950# if _LIBCPP_GLIBC_PREREQ(2, 30) 951# define _LIBCPP_HAS_COND_CLOCKWAIT 952# endif 953# endif 954# endif 955 956# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 957# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \ 958 _LIBCPP_HAS_NO_THREADS is not defined. 959# endif 960 961# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 962# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \ 963 _LIBCPP_HAS_NO_THREADS is defined. 964# endif 965 966# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS) 967# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \ 968 _LIBCPP_HAS_NO_THREADS is defined. 969# endif 970 971# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) 972# define __STDCPP_THREADS__ 1 973# endif 974 975// The glibc and Bionic implementation of pthreads implements 976// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32 977// mutexes have no destroy mechanism. 978// 979// This optimization can't be performed on Apple platforms, where 980// pthread_mutex_destroy can allow the kernel to release resources. 981// See https://llvm.org/D64298 for details. 982// 983// TODO(EricWF): Enable this optimization on Bionic after speaking to their 984// respective stakeholders. 985// clang-format off 986# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \ 987 (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \ 988 defined(_LIBCPP_HAS_THREAD_API_WIN32) 989// clang-format on 990# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 991# endif 992 993// Destroying a condvar is a nop on Windows. 994// 995// This optimization can't be performed on Apple platforms, where 996// pthread_cond_destroy can allow the kernel to release resources. 997// See https://llvm.org/D64298 for details. 998// 999// TODO(EricWF): This is potentially true for some pthread implementations 1000// as well. 1001# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32) 1002# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 1003# endif 1004 1005// Some systems do not provide gets() in their C library, for security reasons. 1006# if defined(_LIBCPP_MSVCRT) || (defined(__FreeBSD_version) && __FreeBSD_version >= 1300043) || defined(__OpenBSD__) 1007# define _LIBCPP_C_HAS_NO_GETS 1008# endif 1009 1010# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \ 1011 defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__) 1012# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE 1013# endif 1014 1015# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic) 1016# define _LIBCPP_HAS_C_ATOMIC_IMP 1017# elif defined(_LIBCPP_COMPILER_GCC) 1018# define _LIBCPP_HAS_GCC_ATOMIC_IMP 1019# endif 1020 1021# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \ 1022 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP) 1023# define _LIBCPP_HAS_NO_ATOMIC_HEADER 1024# else 1025# ifndef _LIBCPP_ATOMIC_FLAG_TYPE 1026# define _LIBCPP_ATOMIC_FLAG_TYPE bool 1027# endif 1028# ifdef _LIBCPP_FREESTANDING 1029# define _LIBCPP_ATOMIC_ONLY_USE_BUILTINS 1030# endif 1031# endif 1032 1033# ifndef _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1034# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1035# endif 1036 1037# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) 1038# if defined(__clang__) && __has_attribute(acquire_capability) 1039// Work around the attribute handling in clang. When both __declspec and 1040// __attribute__ are present, the processing goes awry preventing the definition 1041// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus 1042// combining the two does work. 1043# if !defined(_MSC_VER) 1044# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1045# endif 1046# endif 1047# endif 1048 1049# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1050# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x)) 1051# else 1052# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) 1053# endif 1054 1055# if _LIBCPP_STD_VER > 17 1056# define _LIBCPP_CONSTINIT constinit 1057# elif __has_attribute(__require_constant_initialization__) 1058# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__)) 1059# else 1060# define _LIBCPP_CONSTINIT 1061# endif 1062 1063# if __has_attribute(__diagnose_if__) && !defined(_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS) 1064# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning"))) 1065# else 1066# define _LIBCPP_DIAGNOSE_WARNING(...) 1067# endif 1068 1069// Use a function like macro to imply that it must be followed by a semicolon 1070# if __has_cpp_attribute(fallthrough) 1071# define _LIBCPP_FALLTHROUGH() [[fallthrough]] 1072# elif __has_attribute(__fallthrough__) 1073# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__)) 1074# else 1075# define _LIBCPP_FALLTHROUGH() ((void)0) 1076# endif 1077 1078# if __has_cpp_attribute(_Clang::__lifetimebound__) 1079# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]] 1080# else 1081# define _LIBCPP_LIFETIMEBOUND 1082# endif 1083 1084# if __has_attribute(__nodebug__) 1085# define _LIBCPP_NODEBUG __attribute__((__nodebug__)) 1086# else 1087# define _LIBCPP_NODEBUG 1088# endif 1089 1090# if __has_attribute(__standalone_debug__) 1091# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__)) 1092# else 1093# define _LIBCPP_STANDALONE_DEBUG 1094# endif 1095 1096# if __has_attribute(__preferred_name__) 1097# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x))) 1098# else 1099# define _LIBCPP_PREFERRED_NAME(x) 1100# endif 1101 1102// We often repeat things just for handling wide characters in the library. 1103// When wide characters are disabled, it can be useful to have a quick way of 1104// disabling it without having to resort to #if-#endif, which has a larger 1105// impact on readability. 1106# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) 1107# define _LIBCPP_IF_WIDE_CHARACTERS(...) 1108# else 1109# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__ 1110# endif 1111 1112# if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases) 1113# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases) 1114# else 1115# define _LIBCPP_DECLSPEC_EMPTY_BASES 1116# endif 1117 1118# if defined(_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES) 1119# define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR 1120# define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS 1121# define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE 1122# define _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS 1123# define _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION 1124# endif // _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES 1125 1126# if defined(_LIBCPP_ENABLE_CXX20_REMOVED_FEATURES) 1127# define _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS 1128# define _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_VOID_SPECIALIZATION 1129# define _LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS 1130# define _LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS 1131# define _LIBCPP_ENABLE_CXX20_REMOVED_RAW_STORAGE_ITERATOR 1132# define _LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS 1133# endif // _LIBCPP_ENABLE_CXX20_REMOVED_FEATURES 1134 1135# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") 1136# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") 1137 1138# ifndef _LIBCPP_NO_AUTO_LINK 1139# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1140# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 1141# pragma comment(lib, "c++.lib") 1142# else 1143# pragma comment(lib, "libc++.lib") 1144# endif 1145# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1146# endif // _LIBCPP_NO_AUTO_LINK 1147 1148// Configures the fopen close-on-exec mode character, if any. This string will 1149// be appended to any mode string used by fstream for fopen/fdopen. 1150// 1151// Not all platforms support this, but it helps avoid fd-leaks on platforms that 1152// do. 1153# if defined(__BIONIC__) 1154# define _LIBCPP_FOPEN_CLOEXEC_MODE "e" 1155# else 1156# define _LIBCPP_FOPEN_CLOEXEC_MODE 1157# endif 1158 1159// Support for _FILE_OFFSET_BITS=64 landed gradually in Android, so the full set 1160// of functions used in cstdio may not be available for low API levels when 1161// using 64-bit file offsets on LP32. 1162# if defined(__BIONIC__) && defined(__USE_FILE_OFFSET64) && __ANDROID_API__ < 24 1163# define _LIBCPP_HAS_NO_FGETPOS_FSETPOS 1164# endif 1165 1166# if __has_attribute(__init_priority__) 1167# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100))) 1168# else 1169# define _LIBCPP_INIT_PRIORITY_MAX 1170# endif 1171 1172# if __has_attribute(__format__) 1173// The attribute uses 1-based indices for ordinary and static member functions. 1174// The attribute uses 2-based indices for non-static member functions. 1175# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \ 1176 __attribute__((__format__(archetype, format_string_index, first_format_arg_index))) 1177# else 1178# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */ 1179# endif 1180 1181# if __has_cpp_attribute(msvc::no_unique_address) 1182// MSVC implements [[no_unique_address]] as a silent no-op currently. 1183// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.) 1184// However, MSVC implements [[msvc::no_unique_address]] which does what 1185// [[no_unique_address]] is supposed to do, in general. 1186 1187// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or 1188// [[msvc::no_unique_address]] though. If/when it does implement 1189// [[msvc::no_unique_address]], this should be preferred though. 1190# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]] 1191# elif __has_cpp_attribute(no_unique_address) 1192# define _LIBCPP_NO_UNIQUE_ADDRESS [[no_unique_address]] 1193# else 1194# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */ 1195// Note that this can be replaced by #error as soon as clang-cl 1196// implements msvc::no_unique_address, since there should be no C++20 1197// compiler that doesn't support one of the two attributes at that point. 1198// We generally don't want to use this macro outside of C++20-only code, 1199// because using it conditionally in one language version only would make 1200// the ABI inconsistent. 1201# endif 1202 1203# ifdef _LIBCPP_COMPILER_CLANG_BASED 1204# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push") 1205# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop") 1206# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str)) 1207# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 1208# elif defined(_LIBCPP_COMPILER_GCC) 1209# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push") 1210# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop") 1211# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 1212# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str)) 1213# else 1214# define _LIBCPP_DIAGNOSTIC_PUSH 1215# define _LIBCPP_DIAGNOSTIC_POP 1216# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 1217# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 1218# endif 1219 1220# if defined(_AIX) && !defined(_LIBCPP_COMPILER_GCC) 1221# define _LIBCPP_PACKED_BYTE_FOR_AIX _Pragma("pack(1)") 1222# define _LIBCPP_PACKED_BYTE_FOR_AIX_END _Pragma("pack(pop)") 1223# else 1224# define _LIBCPP_PACKED_BYTE_FOR_AIX /* empty */ 1225# define _LIBCPP_PACKED_BYTE_FOR_AIX_END /* empty */ 1226# endif 1227 1228# if __has_attribute(__packed__) 1229# define _LIBCPP_PACKED __attribute__((__packed__)) 1230# else 1231# define _LIBCPP_PACKED 1232# endif 1233 1234// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these 1235// functions is gradually being added to existing C libraries. The conditions 1236// below check for known C library versions and conditions under which these 1237// functions are declared by the C library. 1238# define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 1239// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if 1240// __cpp_char8_t is defined or if C2X extensions are enabled. Determining 1241// the latter depends on internal GNU libc details that are not appropriate 1242// to depend on here, so any declarations present when __cpp_char8_t is not 1243// defined are ignored. 1244# if defined(_LIBCPP_GLIBC_PREREQ) 1245# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t) 1246# undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 1247# endif 1248# endif 1249 1250// There are a handful of public standard library types that are intended to 1251// support CTAD but don't need any explicit deduction guides to do so. This 1252// macro is used to mark them as such, which suppresses the 1253// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code 1254// with these classes. 1255#if _LIBCPP_STD_VER >= 17 1256# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) \ 1257 template <class ..._Tag> \ 1258 _ClassName(typename _Tag::__allow_ctad...) -> _ClassName<_Tag...> 1259#else 1260# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "") 1261#endif 1262 1263// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use 1264// compiler intrinsics in the Objective-C++ mode. 1265# ifdef __OBJC__ 1266# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS 1267# endif 1268 1269#endif // __cplusplus 1270 1271#endif // _LIBCPP___CONFIG 1272