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#ifdef __cplusplus 26 27# define _LIBCPP_VERSION 15000 28 29# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y 30# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y) 31 32// Valid C++ identifier that revs with every libc++ version. This can be used to 33// generate identifiers that must be unique for every released libc++ version. 34# define _LIBCPP_VERSIONED_IDENTIFIER _LIBCPP_CONCAT(v, _LIBCPP_VERSION) 35 36# if __STDC_HOSTED__ == 0 37# define _LIBCPP_FREESTANDING 38# endif 39 40# ifndef _LIBCPP_STD_VER 41# if __cplusplus <= 201103L 42# define _LIBCPP_STD_VER 11 43# elif __cplusplus <= 201402L 44# define _LIBCPP_STD_VER 14 45# elif __cplusplus <= 201703L 46# define _LIBCPP_STD_VER 17 47# elif __cplusplus <= 202002L 48# define _LIBCPP_STD_VER 20 49# else 50# define _LIBCPP_STD_VER 22 // current year, or date of c++2b ratification 51# endif 52# endif // _LIBCPP_STD_VER 53 54# if defined(__ELF__) 55# define _LIBCPP_OBJECT_FORMAT_ELF 1 56# elif defined(__MACH__) 57# define _LIBCPP_OBJECT_FORMAT_MACHO 1 58# elif defined(_WIN32) 59# define _LIBCPP_OBJECT_FORMAT_COFF 1 60# elif defined(__wasm__) 61# define _LIBCPP_OBJECT_FORMAT_WASM 1 62# elif defined(_AIX) 63# define _LIBCPP_OBJECT_FORMAT_XCOFF 1 64# else 65// ... add new file formats here ... 66# endif 67 68# if _LIBCPP_ABI_VERSION >= 2 69// Change short string representation so that string data starts at offset 0, 70// improving its alignment in some cases. 71# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 72// Fix deque iterator type in order to support incomplete types. 73# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE 74// Fix undefined behavior in how std::list stores its linked nodes. 75# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB 76// Fix undefined behavior in how __tree stores its end and parent nodes. 77# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB 78// Fix undefined behavior in how __hash_table stores its pointer types. 79# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB 80# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB 81# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE 82// Define a key function for `bad_function_call` in the library, to centralize 83// its vtable and typeinfo to libc++ rather than having all other libraries 84// using that class define their own copies. 85# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 86// Override the default return value of exception::what() for 87// bad_function_call::what() with a string that is specific to 88// bad_function_call (see http://wg21.link/LWG2233). This is an ABI break 89// because it changes the vtable layout of bad_function_call. 90# define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE 91// Enable optimized version of __do_get_(un)signed which avoids redundant copies. 92# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET 93// Give reverse_iterator<T> one data member of type T, not two. 94// Also, in C++17 and later, don't derive iterator types from std::iterator. 95# define _LIBCPP_ABI_NO_ITERATOR_BASES 96// Use the smallest possible integer type to represent the index of the variant. 97// Previously libc++ used "unsigned int" exclusively. 98# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION 99// Unstable attempt to provide a more optimized std::function 100# define _LIBCPP_ABI_OPTIMIZED_FUNCTION 101// All the regex constants must be distinct and nonzero. 102# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO 103// Re-worked external template instantiations for std::string with a focus on 104// performance and fast-path inlining. 105# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION 106// Enable clang::trivial_abi on std::unique_ptr. 107# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI 108// Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr 109# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI 110// std::random_device holds some state when it uses an implementation that gets 111// entropy from a file (see _LIBCPP_USING_DEV_RANDOM). When switching from this 112// implementation to another one on a platform that has already shipped 113// std::random_device, one needs to retain the same object layout to remain ABI 114// compatible. This switch removes these workarounds for platforms that don't care 115// about ABI compatibility. 116# define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT 117// Don't export the legacy __basic_string_common class and its methods from the built library. 118# define _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON 119// Don't export the legacy __vector_base_common class and its methods from the built library. 120# define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON 121// According to the Standard, `bitset::operator[] const` returns bool 122# define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL 123// Remove the base 10 implementation of std::to_chars from the dylib. 124// The implementation moved to the header, but we still export the symbols from 125// the dylib for backwards compatibility. 126# define _LIBCPP_ABI_DO_NOT_EXPORT_TO_CHARS_BASE_10 127# elif _LIBCPP_ABI_VERSION == 1 128# if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF)) 129// Enable compiling copies of now inline methods into the dylib to support 130// applications compiled against older libraries. This is unnecessary with 131// COFF dllexport semantics, since dllexport forces a non-inline definition 132// of inline functions to be emitted anyway. Our own non-inline copy would 133// conflict with the dllexport-emitted copy, so we disable it. For XCOFF, 134// the linker will take issue with the symbols in the shared object if the 135// weak inline methods get visibility (such as from -fvisibility-inlines-hidden), 136// so disable it. 137# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS 138# endif 139// Feature macros for disabling pre ABI v1 features. All of these options 140// are deprecated. 141# if defined(__FreeBSD__) 142# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR 143# endif 144# endif 145 146# if defined(_LIBCPP_BUILDING_LIBRARY) || _LIBCPP_ABI_VERSION >= 2 147// Enable additional explicit instantiations of iostreams components. This 148// reduces the number of weak definitions generated in programs that use 149// iostreams by providing a single strong definition in the shared library. 150# define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 151 152// Define a key function for `bad_function_call` in the library, to centralize 153// its vtable and typeinfo to libc++ rather than having all other libraries 154// using that class define their own copies. 155# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 156# endif 157 158# define _LIBCPP_TOSTRING2(x) # x 159# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x) 160 161# if __cplusplus < 201103L 162# define _LIBCPP_CXX03_LANG 163# endif 164 165# ifndef __has_attribute 166# define __has_attribute(__x) 0 167# endif 168 169# ifndef __has_builtin 170# define __has_builtin(__x) 0 171# endif 172 173# ifndef __has_extension 174# define __has_extension(__x) 0 175# endif 176 177# ifndef __has_feature 178# define __has_feature(__x) 0 179# endif 180 181# ifndef __has_cpp_attribute 182# define __has_cpp_attribute(__x) 0 183# endif 184 185// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by 186// the compiler and '1' otherwise. 187# ifndef __is_identifier 188# define __is_identifier(__x) 1 189# endif 190 191# ifndef __has_declspec_attribute 192# define __has_declspec_attribute(__x) 0 193# endif 194 195# define __has_keyword(__x) !(__is_identifier(__x)) 196 197# ifndef __has_include 198# define __has_include(...) 0 199# endif 200 201# if defined(__apple_build_version__) 202# define _LIBCPP_COMPILER_CLANG_BASED 203# define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000) 204# elif defined(__clang__) 205# define _LIBCPP_COMPILER_CLANG_BASED 206# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__) 207# elif defined(__GNUC__) 208# define _LIBCPP_COMPILER_GCC 209# elif defined(_MSC_VER) 210# define _LIBCPP_COMPILER_MSVC 211# endif 212 213# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L 214# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11" 215# endif 216 217# ifdef _LIBCPP_COMPILER_MSVC 218# error If you successfully use libc++ with MSVC please tell the libc++ developers and consider upstreaming your \ 219changes. We are not aware of anybody using this configuration and know that at least some code is currently broken. \ 220If there are users of this configuration we are happy to provide support. 221# endif 222 223// FIXME: ABI detection should be done via compiler builtin macros. This 224// is just a placeholder until Clang implements such macros. For now assume 225// that Windows compilers pretending to be MSVC++ target the Microsoft ABI, 226// and allow the user to explicitly specify the ABI to handle cases where this 227// heuristic falls short. 228# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT) 229# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined" 230# elif defined(_LIBCPP_ABI_FORCE_ITANIUM) 231# define _LIBCPP_ABI_ITANIUM 232# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT) 233# define _LIBCPP_ABI_MICROSOFT 234# else 235# if defined(_WIN32) && defined(_MSC_VER) 236# define _LIBCPP_ABI_MICROSOFT 237# else 238# define _LIBCPP_ABI_ITANIUM 239# endif 240# endif 241 242# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 243# define _LIBCPP_ABI_VCRUNTIME 244# endif 245 246// Incomplete features get their own specific disabling flags. This makes it 247// easier to grep for target specific flags once the feature is complete. 248# if !defined(_LIBCPP_ENABLE_EXPERIMENTAL) && !defined(_LIBCPP_BUILDING_LIBRARY) 249# define _LIBCPP_HAS_NO_INCOMPLETE_FORMAT 250# define _LIBCPP_HAS_NO_INCOMPLETE_RANGES 251# endif 252 253// Need to detect which libc we're using if we're on Linux. 254# if defined(__linux__) 255# include <features.h> 256# if defined(__GLIBC_PREREQ) 257# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b) 258# else 259# define _LIBCPP_GLIBC_PREREQ(a, b) 0 260# endif // defined(__GLIBC_PREREQ) 261# endif // defined(__linux__) 262 263# if defined(__MVS__) 264# include <features.h> // for __NATIVE_ASCII_F 265# endif 266 267# ifdef __LITTLE_ENDIAN__ 268# if __LITTLE_ENDIAN__ 269# define _LIBCPP_LITTLE_ENDIAN 270# endif // __LITTLE_ENDIAN__ 271# endif // __LITTLE_ENDIAN__ 272 273# ifdef __BIG_ENDIAN__ 274# if __BIG_ENDIAN__ 275# define _LIBCPP_BIG_ENDIAN 276# endif // __BIG_ENDIAN__ 277# endif // __BIG_ENDIAN__ 278 279# ifdef __BYTE_ORDER__ 280# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 281# define _LIBCPP_LITTLE_ENDIAN 282# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 283# define _LIBCPP_BIG_ENDIAN 284# endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 285# endif // __BYTE_ORDER__ 286 287# ifdef __FreeBSD__ 288# include <sys/endian.h> 289# include <osreldate.h> 290# if _BYTE_ORDER == _LITTLE_ENDIAN 291# define _LIBCPP_LITTLE_ENDIAN 292# else // _BYTE_ORDER == _LITTLE_ENDIAN 293# define _LIBCPP_BIG_ENDIAN 294# endif // _BYTE_ORDER == _LITTLE_ENDIAN 295# endif // __FreeBSD__ 296 297# if defined(__NetBSD__) || defined(__OpenBSD__) 298# include <sys/endian.h> 299# if _BYTE_ORDER == _LITTLE_ENDIAN 300# define _LIBCPP_LITTLE_ENDIAN 301# else // _BYTE_ORDER == _LITTLE_ENDIAN 302# define _LIBCPP_BIG_ENDIAN 303# endif // _BYTE_ORDER == _LITTLE_ENDIAN 304# endif // defined(__NetBSD__) || defined(__OpenBSD__) 305 306# if defined(_WIN32) 307# define _LIBCPP_WIN32API 308# define _LIBCPP_LITTLE_ENDIAN 309# define _LIBCPP_SHORT_WCHAR 1 310// Both MinGW and native MSVC provide a "MSVC"-like environment 311# define _LIBCPP_MSVCRT_LIKE 312// If mingw not explicitly detected, assume using MS C runtime only if 313// a MS compatibility version is specified. 314# if defined(_MSC_VER) && !defined(__MINGW32__) 315# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library 316# endif 317# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__)) 318# define _LIBCPP_HAS_BITSCAN64 319# endif 320# define _LIBCPP_HAS_OPEN_WITH_WCHAR 321# endif // defined(_WIN32) 322 323# ifdef __sun__ 324# include <sys/isa_defs.h> 325# ifdef _LITTLE_ENDIAN 326# define _LIBCPP_LITTLE_ENDIAN 327# else 328# define _LIBCPP_BIG_ENDIAN 329# endif 330# endif // __sun__ 331 332# if defined(_AIX) && !defined(__64BIT__) 333// The size of wchar is 2 byte on 32-bit mode on AIX. 334# define _LIBCPP_SHORT_WCHAR 1 335# endif 336 337// Libc++ supports various implementations of std::random_device. 338// 339// _LIBCPP_USING_DEV_RANDOM 340// Read entropy from the given file, by default `/dev/urandom`. 341// If a token is provided, it is assumed to be the path to a file 342// to read entropy from. This is the default behavior if nothing 343// else is specified. This implementation requires storing state 344// inside `std::random_device`. 345// 346// _LIBCPP_USING_ARC4_RANDOM 347// Use arc4random(). This allows obtaining random data even when 348// using sandboxing mechanisms. On some platforms like Apple, this 349// is the recommended source of entropy for user-space programs. 350// When this option is used, the token passed to `std::random_device`'s 351// constructor *must* be "/dev/urandom" -- anything else is an error. 352// 353// _LIBCPP_USING_GETENTROPY 354// Use getentropy(). 355// When this option is used, the token passed to `std::random_device`'s 356// constructor *must* be "/dev/urandom" -- anything else is an error. 357// 358// _LIBCPP_USING_FUCHSIA_CPRNG 359// Use Fuchsia's zx_cprng_draw() system call, which is specified to 360// deliver high-quality entropy and cannot fail. 361// When this option is used, the token passed to `std::random_device`'s 362// constructor *must* be "/dev/urandom" -- anything else is an error. 363// 364// _LIBCPP_USING_NACL_RANDOM 365// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access, 366// including accesses to the special files under `/dev`. This implementation 367// uses the NaCL syscall `nacl_secure_random_init()` to get entropy. 368// When this option is used, the token passed to `std::random_device`'s 369// constructor *must* be "/dev/urandom" -- anything else is an error. 370// 371// _LIBCPP_USING_WIN32_RANDOM 372// Use rand_s(), for use on Windows. 373// When this option is used, the token passed to `std::random_device`'s 374// constructor *must* be "/dev/urandom" -- anything else is an error. 375# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \ 376 defined(__DragonFly__) || defined(__sun__) 377# define _LIBCPP_USING_ARC4_RANDOM 378# elif defined(__wasi__) || defined(__EMSCRIPTEN__) 379# define _LIBCPP_USING_GETENTROPY 380# elif defined(__Fuchsia__) 381# define _LIBCPP_USING_FUCHSIA_CPRNG 382# elif defined(__native_client__) 383# define _LIBCPP_USING_NACL_RANDOM 384# elif defined(_LIBCPP_WIN32API) 385# define _LIBCPP_USING_WIN32_RANDOM 386# else 387# define _LIBCPP_USING_DEV_RANDOM 388# endif 389 390# if !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN) 391# include <endian.h> 392# if __BYTE_ORDER == __LITTLE_ENDIAN 393# define _LIBCPP_LITTLE_ENDIAN 394# elif __BYTE_ORDER == __BIG_ENDIAN 395# define _LIBCPP_BIG_ENDIAN 396# else // __BYTE_ORDER == __BIG_ENDIAN 397# error unable to determine endian 398# endif 399# endif // !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN) 400 401# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC) 402# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi"))) 403# else 404# define _LIBCPP_NO_CFI 405# endif 406 407# ifndef _LIBCPP_CXX03_LANG 408 409# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp) 410# define _ALIGNAS_TYPE(x) alignas(x) 411# define _ALIGNAS(x) alignas(x) 412# define _LIBCPP_NORETURN [[noreturn]] 413# define _NOEXCEPT noexcept 414# define _NOEXCEPT_(x) noexcept(x) 415 416# else 417 418# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp) 419# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 420# define _ALIGNAS(x) __attribute__((__aligned__(x))) 421# define _LIBCPP_NORETURN __attribute__((noreturn)) 422# define _LIBCPP_HAS_NO_NOEXCEPT 423# define nullptr __nullptr 424# define _NOEXCEPT throw() 425# define _NOEXCEPT_(x) 426 427typedef __char16_t char16_t; 428typedef __char32_t char32_t; 429 430# endif 431 432# if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L 433# define _LIBCPP_NO_EXCEPTIONS 434# endif 435 436# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp) 437 438# if defined(_LIBCPP_COMPILER_CLANG_BASED) 439 440# if defined(__APPLE__) && !defined(__i386__) && !defined(__x86_64__) && (!defined(__arm__) || __ARM_ARCH_7K__ >= 2) 441# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 442# endif 443 444// Objective-C++ features (opt-in) 445# if __has_feature(objc_arc) 446# define _LIBCPP_HAS_OBJC_ARC 447# endif 448 449# if __has_feature(objc_arc_weak) 450# define _LIBCPP_HAS_OBJC_ARC_WEAK 451# endif 452 453# if __has_extension(blocks) 454# define _LIBCPP_HAS_EXTENSION_BLOCKS 455# endif 456 457# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__) 458# define _LIBCPP_HAS_BLOCKS_RUNTIME 459# endif 460 461# if !__has_feature(address_sanitizer) 462# define _LIBCPP_HAS_NO_ASAN 463# endif 464 465// Allow for build-time disabling of unsigned integer sanitization 466# if __has_attribute(no_sanitize) 467# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow"))) 468# endif 469 470# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 471 472# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 473 474# elif defined(_LIBCPP_COMPILER_GCC) 475 476# if !defined(__SANITIZE_ADDRESS__) 477# define _LIBCPP_HAS_NO_ASAN 478# endif 479 480# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 481 482# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 483 484# elif defined(_LIBCPP_COMPILER_MSVC) 485 486# define _LIBCPP_WARNING(x) __pragma(message(__FILE__ "(" _LIBCPP_TOSTRING(__LINE__) ") : warning note: " x)) 487 488# if _MSC_VER < 1900 489# error "MSVC versions prior to Visual Studio 2015 are not supported" 490# endif 491 492# define _LIBCPP_NORETURN __declspec(noreturn) 493 494# define _LIBCPP_WEAK 495 496# define _LIBCPP_HAS_NO_ASAN 497 498# define _LIBCPP_ALWAYS_INLINE __forceinline 499 500# define _LIBCPP_HAS_NO_VECTOR_EXTENSION 501 502# define _LIBCPP_DISABLE_EXTENSION_WARNING 503 504# endif // _LIBCPP_COMPILER_[CLANG|GCC|MSVC] 505 506# if defined(_LIBCPP_OBJECT_FORMAT_COFF) 507 508# ifdef _DLL 509# define _LIBCPP_CRT_FUNC __declspec(dllimport) 510# else 511# define _LIBCPP_CRT_FUNC 512# endif 513 514# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY)) 515# define _LIBCPP_DLL_VIS 516# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 517# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 518# define _LIBCPP_OVERRIDABLE_FUNC_VIS 519# define _LIBCPP_EXPORTED_FROM_ABI 520# elif defined(_LIBCPP_BUILDING_LIBRARY) 521# define _LIBCPP_DLL_VIS __declspec(dllexport) 522# if defined(__MINGW32__) 523# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 524# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 525# else 526# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 527# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS 528# endif 529# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS 530# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport) 531# else 532# define _LIBCPP_DLL_VIS __declspec(dllimport) 533# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 534# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 535# define _LIBCPP_OVERRIDABLE_FUNC_VIS 536# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport) 537# endif 538 539# define _LIBCPP_TYPE_VIS _LIBCPP_DLL_VIS 540# define _LIBCPP_FUNC_VIS _LIBCPP_DLL_VIS 541# define _LIBCPP_EXCEPTION_ABI _LIBCPP_DLL_VIS 542# define _LIBCPP_HIDDEN 543# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 544# define _LIBCPP_TEMPLATE_VIS 545# define _LIBCPP_TEMPLATE_DATA_VIS 546# define _LIBCPP_ENUM_VIS 547 548# else 549 550# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 551# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis))) 552# else 553# define _LIBCPP_VISIBILITY(vis) 554# endif 555 556# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden") 557# define _LIBCPP_FUNC_VIS _LIBCPP_VISIBILITY("default") 558# define _LIBCPP_TYPE_VIS _LIBCPP_VISIBILITY("default") 559# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default") 560# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default") 561# define _LIBCPP_EXCEPTION_ABI _LIBCPP_VISIBILITY("default") 562# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default") 563# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 564 565// TODO: Make this a proper customization point or remove the option to override it. 566# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS 567# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default") 568# endif 569 570# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 571// The inline should be removed once PR32114 is resolved 572# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN 573# else 574# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 575# endif 576 577# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 578# if __has_attribute(__type_visibility__) 579# define _LIBCPP_TEMPLATE_VIS __attribute__((__type_visibility__("default"))) 580# else 581# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default"))) 582# endif 583# else 584# define _LIBCPP_TEMPLATE_VIS 585# endif 586 587# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) 588# define _LIBCPP_ENUM_VIS __attribute__((__type_visibility__("default"))) 589# else 590# define _LIBCPP_ENUM_VIS 591# endif 592 593# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF) 594 595# if __has_attribute(exclude_from_explicit_instantiation) 596# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__)) 597# else 598// Try to approximate the effect of exclude_from_explicit_instantiation 599// (which is that entities are not assumed to be provided by explicit 600// template instantiations in the dylib) by always inlining those entities. 601# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE 602# endif 603 604// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved 605// on two levels: 606// 1. The symbol is given hidden visibility, which ensures that users won't start exporting 607// symbols from their dynamic library by means of using the libc++ headers. This ensures 608// that those symbols stay private to the dynamic library in which it is defined. 609// 610// 2. The symbol is given an ABI tag that changes with each version of libc++. This ensures 611// that no ODR violation can arise from mixing two TUs compiled with different versions 612// of libc++ where we would have changed the definition of a symbol. If the symbols shared 613// the same name, the ODR would require that their definitions be token-by-token equivalent, 614// which basically prevents us from being able to make any change to any function in our 615// headers. Using this ABI tag ensures that the symbol name is "bumped" artificially at 616// each release, which lets us change the definition of these symbols at our leisure. 617// Note that historically, this has been achieved in various ways, including force-inlining 618// all functions or giving internal linkage to all functions. Both these (previous) solutions 619// suffer from drawbacks that lead notably to code bloat. 620// 621// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend 622// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library. 623// 624// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing 625// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and 626// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70. 627# ifndef _LIBCPP_NO_ABI_TAG 628# define _LIBCPP_HIDE_FROM_ABI \ 629 _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \ 630 __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_VERSIONED_IDENTIFIER)))) 631# else 632# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 633# endif 634 635# ifdef _LIBCPP_BUILDING_LIBRARY 636# if _LIBCPP_ABI_VERSION > 1 637# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 638# else 639# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 640# endif 641# else 642# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 643# endif 644 645// Just so we can migrate to the new macros gradually. 646# define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI 647 648// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect. 649// clang-format off 650# define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { inline namespace _LIBCPP_ABI_NAMESPACE { 651# define _LIBCPP_END_NAMESPACE_STD }} 652# define _VSTD std 653 654_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD 655 656# if _LIBCPP_STD_VER > 14 657# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \ 658 _LIBCPP_BEGIN_NAMESPACE_STD inline namespace __fs { namespace filesystem { 659# else 660# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \ 661 _LIBCPP_BEGIN_NAMESPACE_STD namespace __fs { namespace filesystem { 662# endif 663 664# define _LIBCPP_END_NAMESPACE_FILESYSTEM _LIBCPP_END_NAMESPACE_STD }} 665// clang-format on 666 667# define _VSTD_FS std::__fs::filesystem 668 669# if __has_attribute(__enable_if__) 670# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, ""))) 671# endif 672 673# ifndef __SIZEOF_INT128__ 674# define _LIBCPP_HAS_NO_INT128 675# endif 676 677# ifdef _LIBCPP_CXX03_LANG 678# define static_assert(...) _Static_assert(__VA_ARGS__) 679# define decltype(...) __decltype(__VA_ARGS__) 680# endif // _LIBCPP_CXX03_LANG 681 682# ifdef _LIBCPP_CXX03_LANG 683# define _LIBCPP_CONSTEXPR 684# else 685# define _LIBCPP_CONSTEXPR constexpr 686# endif 687 688# ifndef __cpp_consteval 689# define _LIBCPP_CONSTEVAL _LIBCPP_CONSTEXPR 690# else 691# define _LIBCPP_CONSTEVAL consteval 692# endif 693 694# ifdef __GNUC__ 695# define _LIBCPP_NOALIAS __attribute__((__malloc__)) 696# else 697# define _LIBCPP_NOALIAS 698# endif 699 700# if __has_attribute(using_if_exists) 701# define _LIBCPP_USING_IF_EXISTS __attribute__((using_if_exists)) 702# else 703# define _LIBCPP_USING_IF_EXISTS 704# endif 705 706# ifdef _LIBCPP_CXX03_LANG 707# define _LIBCPP_DECLARE_STRONG_ENUM(x) \ 708 struct _LIBCPP_TYPE_VIS x { \ 709 enum __lx 710// clang-format off 711# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \ 712 __lx __v_; \ 713 _LIBCPP_INLINE_VISIBILITY x(__lx __v) : __v_(__v) {} \ 714 _LIBCPP_INLINE_VISIBILITY explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \ 715 _LIBCPP_INLINE_VISIBILITY operator int() const { return __v_; } \ 716 }; 717// clang-format on 718 719# else // _LIBCPP_CXX03_LANG 720# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_ENUM_VIS x 721# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) 722# endif // _LIBCPP_CXX03_LANG 723 724# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__sun__) || \ 725 defined(__NetBSD__) 726# define _LIBCPP_LOCALE__L_EXTENSIONS 1 727# endif 728 729# ifdef __FreeBSD__ 730# define _DECLARE_C99_LDBL_MATH 1 731# endif 732 733// If we are getting operator new from the MSVC CRT, then allocation overloads 734// for align_val_t were added in 19.12, aka VS 2017 version 15.3. 735# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912 736# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 737# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new) 738// We're deferring to Microsoft's STL to provide aligned new et al. We don't 739// have it unless the language feature test macro is defined. 740# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 741# elif defined(__MVS__) 742# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 743# endif 744 745# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606) 746# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 747# endif 748 749# if defined(__APPLE__) || defined(__FreeBSD__) 750# define _LIBCPP_HAS_DEFAULTRUNELOCALE 751# endif 752 753# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__) 754# define _LIBCPP_WCTYPE_IS_MASK 755# endif 756 757# if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t) 758# define _LIBCPP_HAS_NO_CHAR8_T 759# endif 760 761// Deprecation macros. 762// 763// Deprecations warnings are always enabled, except when users explicitly opt-out 764// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS. 765# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 766# if __has_attribute(deprecated) 767# define _LIBCPP_DEPRECATED __attribute__((deprecated)) 768# define _LIBCPP_DEPRECATED_(m) __attribute__((deprected(m))) 769# elif _LIBCPP_STD_VER > 11 770# define _LIBCPP_DEPRECATED [[deprecated]] 771# define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]] 772# else 773# define _LIBCPP_DEPRECATED 774# define _LIBCPP_DEPRECATED_(m) 775# endif 776# else 777# define _LIBCPP_DEPRECATED 778# define _LIBCPP_DEPRECATED_(m) 779# endif 780 781# if !defined(_LIBCPP_CXX03_LANG) 782# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED 783# else 784# define _LIBCPP_DEPRECATED_IN_CXX11 785# endif 786 787# if _LIBCPP_STD_VER > 11 788# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED 789# else 790# define _LIBCPP_DEPRECATED_IN_CXX14 791# endif 792 793# if _LIBCPP_STD_VER > 14 794# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED 795# else 796# define _LIBCPP_DEPRECATED_IN_CXX17 797# endif 798 799# if _LIBCPP_STD_VER > 17 800# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED 801# else 802# define _LIBCPP_DEPRECATED_IN_CXX20 803# endif 804 805# if !defined(_LIBCPP_HAS_NO_CHAR8_T) 806# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED 807# else 808# define _LIBCPP_DEPRECATED_WITH_CHAR8_T 809# endif 810 811// Macros to enter and leave a state where deprecation warnings are suppressed. 812# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC) 813# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \ 814 _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \ 815 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") 816# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop") 817# else 818# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH 819# define _LIBCPP_SUPPRESS_DEPRECATED_POP 820# endif 821 822# if _LIBCPP_STD_VER <= 11 823# define _LIBCPP_EXPLICIT_AFTER_CXX11 824# else 825# define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit 826# endif 827 828# if _LIBCPP_STD_VER > 11 829# define _LIBCPP_CONSTEXPR_AFTER_CXX11 constexpr 830# else 831# define _LIBCPP_CONSTEXPR_AFTER_CXX11 832# endif 833 834# if _LIBCPP_STD_VER > 14 835# define _LIBCPP_CONSTEXPR_AFTER_CXX14 constexpr 836# else 837# define _LIBCPP_CONSTEXPR_AFTER_CXX14 838# endif 839 840# if _LIBCPP_STD_VER > 17 841# define _LIBCPP_CONSTEXPR_AFTER_CXX17 constexpr 842# else 843# define _LIBCPP_CONSTEXPR_AFTER_CXX17 844# endif 845 846# if __has_cpp_attribute(nodiscard) || defined(_LIBCPP_COMPILER_MSVC) 847# define _LIBCPP_NODISCARD [[nodiscard]] 848# elif defined(_LIBCPP_COMPILER_CLANG_BASED) && !defined(_LIBCPP_CXX03_LANG) 849# define _LIBCPP_NODISCARD [[clang::warn_unused_result]] 850# else 851// We can't use GCC's [[gnu::warn_unused_result]] and 852// __attribute__((warn_unused_result)), because GCC does not silence them via 853// (void) cast. 854# define _LIBCPP_NODISCARD 855# endif 856 857// _LIBCPP_NODISCARD_EXT may be used to apply [[nodiscard]] to entities not 858// specified as such as an extension. 859# if defined(_LIBCPP_ENABLE_NODISCARD) && !defined(_LIBCPP_DISABLE_NODISCARD_EXT) 860# define _LIBCPP_NODISCARD_EXT _LIBCPP_NODISCARD 861# else 862# define _LIBCPP_NODISCARD_EXT 863# endif 864 865# if !defined(_LIBCPP_DISABLE_NODISCARD_AFTER_CXX17) && (_LIBCPP_STD_VER > 17 || defined(_LIBCPP_ENABLE_NODISCARD)) 866# define _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_NODISCARD 867# else 868# define _LIBCPP_NODISCARD_AFTER_CXX17 869# endif 870 871# if __has_attribute(no_destroy) 872# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__)) 873# else 874# define _LIBCPP_NO_DESTROY 875# endif 876 877# ifndef _LIBCPP_HAS_NO_ASAN 878 extern "C" _LIBCPP_FUNC_VIS void 879 __sanitizer_annotate_contiguous_container(const void*, const void*, const void*, const void*); 880# endif 881 882// Try to find out if RTTI is disabled. 883# if !defined(__cpp_rtti) || __cpp_rtti < 199711L 884# define _LIBCPP_NO_RTTI 885# endif 886 887# ifndef _LIBCPP_WEAK 888# define _LIBCPP_WEAK __attribute__((__weak__)) 889# endif 890 891// Thread API 892// clang-format off 893# if !defined(_LIBCPP_HAS_NO_THREADS) && \ 894 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \ 895 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \ 896 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 897 898# if defined(__FreeBSD__) || \ 899 defined(__wasi__) || \ 900 defined(__NetBSD__) || \ 901 defined(__OpenBSD__) || \ 902 defined(__NuttX__) || \ 903 defined(__linux__) || \ 904 defined(__GNU__) || \ 905 defined(__APPLE__) || \ 906 defined(__sun__) || \ 907 defined(__MVS__) || \ 908 defined(_AIX) || \ 909 defined(__EMSCRIPTEN__) 910// clang-format on 911# define _LIBCPP_HAS_THREAD_API_PTHREAD 912# elif defined(__Fuchsia__) 913// TODO(44575): Switch to C11 thread API when possible. 914# define _LIBCPP_HAS_THREAD_API_PTHREAD 915# elif defined(_LIBCPP_WIN32API) 916# define _LIBCPP_HAS_THREAD_API_WIN32 917# else 918# error "No thread API" 919# endif // _LIBCPP_HAS_THREAD_API 920# endif // _LIBCPP_HAS_NO_THREADS 921 922# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 923# if defined(__ANDROID__) && __ANDROID_API__ >= 30 924# define _LIBCPP_HAS_COND_CLOCKWAIT 925# elif defined(_LIBCPP_GLIBC_PREREQ) 926# if _LIBCPP_GLIBC_PREREQ(2, 30) 927# define _LIBCPP_HAS_COND_CLOCKWAIT 928# endif 929# endif 930# endif 931 932# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 933# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \ 934 _LIBCPP_HAS_NO_THREADS is not defined. 935# endif 936 937# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 938# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \ 939 _LIBCPP_HAS_NO_THREADS is defined. 940# endif 941 942# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS) 943# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \ 944 _LIBCPP_HAS_NO_THREADS is defined. 945# endif 946 947# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) 948# define __STDCPP_THREADS__ 1 949# endif 950 951// The glibc and Bionic implementation of pthreads implements 952// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32 953// mutexes have no destroy mechanism. 954// 955// This optimization can't be performed on Apple platforms, where 956// pthread_mutex_destroy can allow the kernel to release resources. 957// See https://llvm.org/D64298 for details. 958// 959// TODO(EricWF): Enable this optimization on Bionic after speaking to their 960// respective stakeholders. 961// clang-format off 962# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \ 963 (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \ 964 defined(_LIBCPP_HAS_THREAD_API_WIN32) 965// clang-format on 966# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 967# endif 968 969// Destroying a condvar is a nop on Windows. 970// 971// This optimization can't be performed on Apple platforms, where 972// pthread_cond_destroy can allow the kernel to release resources. 973// See https://llvm.org/D64298 for details. 974// 975// TODO(EricWF): This is potentially true for some pthread implementations 976// as well. 977# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32) 978# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 979# endif 980 981// Some systems do not provide gets() in their C library, for security reasons. 982# if defined(_LIBCPP_MSVCRT) || (defined(__FreeBSD_version) && __FreeBSD_version >= 1300043) || defined(__OpenBSD__) 983# define _LIBCPP_C_HAS_NO_GETS 984# endif 985 986# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \ 987 defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__) 988# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE 989# endif 990 991# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic) 992# define _LIBCPP_HAS_C_ATOMIC_IMP 993# elif defined(_LIBCPP_COMPILER_GCC) 994# define _LIBCPP_HAS_GCC_ATOMIC_IMP 995# endif 996 997# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \ 998 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP) 999# define _LIBCPP_HAS_NO_ATOMIC_HEADER 1000# else 1001# ifndef _LIBCPP_ATOMIC_FLAG_TYPE 1002# define _LIBCPP_ATOMIC_FLAG_TYPE bool 1003# endif 1004# ifdef _LIBCPP_FREESTANDING 1005# define _LIBCPP_ATOMIC_ONLY_USE_BUILTINS 1006# endif 1007# endif 1008 1009# ifndef _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1010# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1011# endif 1012 1013# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) 1014# if defined(__clang__) && __has_attribute(acquire_capability) 1015// Work around the attribute handling in clang. When both __declspec and 1016// __attribute__ are present, the processing goes awry preventing the definition 1017// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus 1018// combining the two does work. 1019# if !defined(_MSC_VER) 1020# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1021# endif 1022# endif 1023# endif 1024 1025# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1026# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x)) 1027# else 1028# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) 1029# endif 1030 1031# if _LIBCPP_STD_VER > 17 1032# define _LIBCPP_CONSTINIT constinit 1033# elif __has_attribute(require_constant_initialization) 1034# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__)) 1035# else 1036# define _LIBCPP_CONSTINIT 1037# endif 1038 1039# if __has_attribute(diagnose_if) && !defined(_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS) 1040# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((diagnose_if(__VA_ARGS__, "warning"))) 1041# define _LIBCPP_DIAGNOSE_ERROR(...) __attribute__((diagnose_if(__VA_ARGS__, "error"))) 1042# else 1043# define _LIBCPP_DIAGNOSE_WARNING(...) 1044# define _LIBCPP_DIAGNOSE_ERROR(...) 1045# endif 1046 1047// Use a function like macro to imply that it must be followed by a semicolon 1048# if __has_cpp_attribute(fallthrough) 1049# define _LIBCPP_FALLTHROUGH() [[fallthrough]] 1050# elif __has_attribute(__fallthrough__) 1051# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__)) 1052# else 1053# define _LIBCPP_FALLTHROUGH() ((void)0) 1054# endif 1055 1056# if __has_attribute(__nodebug__) 1057# define _LIBCPP_NODEBUG __attribute__((__nodebug__)) 1058# else 1059# define _LIBCPP_NODEBUG 1060# endif 1061 1062# if __has_attribute(__standalone_debug__) 1063# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__)) 1064# else 1065# define _LIBCPP_STANDALONE_DEBUG 1066# endif 1067 1068# if __has_attribute(__preferred_name__) 1069# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x))) 1070# else 1071# define _LIBCPP_PREFERRED_NAME(x) 1072# endif 1073 1074// We often repeat things just for handling wide characters in the library. 1075// When wide characters are disabled, it can be useful to have a quick way of 1076// disabling it without having to resort to #if-#endif, which has a larger 1077// impact on readability. 1078# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) 1079# define _LIBCPP_IF_WIDE_CHARACTERS(...) 1080# else 1081# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__ 1082# endif 1083 1084# if defined(_LIBCPP_ABI_MICROSOFT) && (defined(_LIBCPP_COMPILER_MSVC) || __has_declspec_attribute(empty_bases)) 1085# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases) 1086# else 1087# define _LIBCPP_DECLSPEC_EMPTY_BASES 1088# endif 1089 1090# if defined(_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES) 1091# define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR 1092# define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS 1093# define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE 1094# define _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS 1095# define _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION 1096# endif // _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES 1097 1098# if defined(_LIBCPP_ENABLE_CXX20_REMOVED_FEATURES) 1099# define _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS 1100# define _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_VOID_SPECIALIZATION 1101# define _LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS 1102# define _LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS 1103# define _LIBCPP_ENABLE_CXX20_REMOVED_RAW_STORAGE_ITERATOR 1104# define _LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS 1105# endif // _LIBCPP_ENABLE_CXX20_REMOVED_FEATURES 1106 1107# if !defined(__cpp_impl_coroutine) || __cpp_impl_coroutine < 201902L 1108# define _LIBCPP_HAS_NO_CXX20_COROUTINES 1109# endif 1110 1111# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") 1112# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") 1113 1114# ifndef _LIBCPP_NO_AUTO_LINK 1115# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1116# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 1117# pragma comment(lib, "c++.lib") 1118# else 1119# pragma comment(lib, "libc++.lib") 1120# endif 1121# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1122# endif // _LIBCPP_NO_AUTO_LINK 1123 1124// Configures the fopen close-on-exec mode character, if any. This string will 1125// be appended to any mode string used by fstream for fopen/fdopen. 1126// 1127// Not all platforms support this, but it helps avoid fd-leaks on platforms that 1128// do. 1129# if defined(__BIONIC__) 1130# define _LIBCPP_FOPEN_CLOEXEC_MODE "e" 1131# else 1132# define _LIBCPP_FOPEN_CLOEXEC_MODE 1133# endif 1134 1135// Support for _FILE_OFFSET_BITS=64 landed gradually in Android, so the full set 1136// of functions used in cstdio may not be available for low API levels when 1137// using 64-bit file offsets on LP32. 1138# if defined(__BIONIC__) && defined(__USE_FILE_OFFSET64) && __ANDROID_API__ < 24 1139# define _LIBCPP_HAS_NO_FGETPOS_FSETPOS 1140# endif 1141 1142# if __has_attribute(init_priority) 1143// TODO: Remove this once we drop support for building libc++ with old Clangs 1144# if (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1200) || \ 1145 (defined(__apple_build_version__) && __apple_build_version__ < 13000000) 1146# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((init_priority(101))) 1147# else 1148# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((init_priority(100))) 1149# endif 1150# else 1151# define _LIBCPP_INIT_PRIORITY_MAX 1152# endif 1153 1154# if defined(__GNUC__) || defined(__clang__) 1155// The attribute uses 1-based indices for ordinary and static member functions. 1156// The attribute uses 2-based indices for non-static member functions. 1157# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \ 1158 __attribute__((__format__(archetype, format_string_index, first_format_arg_index))) 1159# else 1160# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */ 1161# endif 1162 1163# if __has_cpp_attribute(msvc::no_unique_address) 1164// MSVC implements [[no_unique_address]] as a silent no-op currently. 1165// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.) 1166// However, MSVC implements [[msvc::no_unique_address]] which does what 1167// [[no_unique_address]] is supposed to do, in general. 1168 1169// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or 1170// [[msvc::no_unique_address]] though. If/when it does implement 1171// [[msvc::no_unique_address]], this should be preferred though. 1172# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]] 1173# elif __has_cpp_attribute(no_unique_address) 1174# define _LIBCPP_NO_UNIQUE_ADDRESS [[no_unique_address]] 1175# else 1176# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */ 1177// Note that this can be replaced by #error as soon as clang-cl 1178// implements msvc::no_unique_address, since there should be no C++20 1179// compiler that doesn't support one of the two attributes at that point. 1180// We generally don't want to use this macro outside of C++20-only code, 1181// because using it conditionally in one language version only would make 1182// the ABI inconsistent. 1183# endif 1184 1185# ifdef _LIBCPP_COMPILER_CLANG_BASED 1186# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push") 1187# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop") 1188# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str)) 1189# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 1190# elif defined(_LIBCPP_COMPILER_GCC) 1191# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push") 1192# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop") 1193# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 1194# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str)) 1195# else 1196# define _LIBCPP_DIAGNOSTIC_PUSH 1197# define _LIBCPP_DIAGNOSTIC_POP 1198# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 1199# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 1200# endif 1201 1202# if defined(_AIX) && !defined(_LIBCPP_COMPILER_GCC) 1203# define _LIBCPP_PACKED_BYTE_FOR_AIX _Pragma("pack(1)") 1204# define _LIBCPP_PACKED_BYTE_FOR_AIX_END _Pragma("pack(pop)") 1205# else 1206# define _LIBCPP_PACKED_BYTE_FOR_AIX /* empty */ 1207# define _LIBCPP_PACKED_BYTE_FOR_AIX_END /* empty */ 1208# endif 1209 1210# if __has_attribute(__packed__) 1211# define _LIBCPP_PACKED __attribute__((__packed__)) 1212# else 1213# define _LIBCPP_PACKED 1214# endif 1215 1216#endif // __cplusplus 1217 1218#endif // _LIBCPP___CONFIG 1219