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#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER 16# pragma GCC system_header 17#endif 18 19#if defined(_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES) && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 20# pragma clang deprecated( \ 21 _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES, \ 22 "_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES is deprecated in LLVM 18 and will be removed in LLVM 19") 23#endif 24#if defined(_LIBCPP_ENABLE_CXX20_REMOVED_FEATURES) && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 25# pragma clang deprecated( \ 26 _LIBCPP_ENABLE_CXX20_REMOVED_FEATURES, \ 27 "_LIBCPP_ENABLE_CXX20_REMOVED_FEATURES is deprecated in LLVM 18 and will be removed in LLVM 19") 28#endif 29 30#if defined(__apple_build_version__) 31// Given AppleClang XX.Y.Z, _LIBCPP_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403) 32# define _LIBCPP_COMPILER_CLANG_BASED 33# define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000) 34#elif defined(__clang__) 35# define _LIBCPP_COMPILER_CLANG_BASED 36# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__) 37#elif defined(__GNUC__) 38# define _LIBCPP_COMPILER_GCC 39# define _LIBCPP_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__) 40#endif 41 42#ifdef __cplusplus 43 44// Warn if a compiler version is used that is not supported anymore 45// LLVM RELEASE Update the minimum compiler versions 46#if defined(_LIBCPP_ENABLE_COMPILER_VERSION_CHECKS) // FreeBSD customization 47# if defined(_LIBCPP_CLANG_VER) 48# if _LIBCPP_CLANG_VER < 1600 49# warning "Libc++ only supports Clang 16 and later" 50# endif 51# elif defined(_LIBCPP_APPLE_CLANG_VER) 52# if _LIBCPP_APPLE_CLANG_VER < 1500 53# warning "Libc++ only supports AppleClang 15 and later" 54# endif 55# elif defined(_LIBCPP_GCC_VER) 56# if _LIBCPP_GCC_VER < 1300 57# warning "Libc++ only supports GCC 13 and later" 58# endif 59# endif 60#endif // _LIBCPP_ENABLE_COMPILER_VERSION_CHECKS 61 62// The attributes supported by clang are documented at https://clang.llvm.org/docs/AttributeReference.html 63 64// _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM. 65// Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is 66// defined to XXYYZZ. 67# define _LIBCPP_VERSION 180100 68 69# define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y 70# define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y) 71 72# if __STDC_HOSTED__ == 0 73# define _LIBCPP_FREESTANDING 74# endif 75 76// NOLINTBEGIN(libcpp-cpp-version-check) 77# ifndef _LIBCPP_STD_VER 78# if __cplusplus <= 201103L 79# define _LIBCPP_STD_VER 11 80# elif __cplusplus <= 201402L 81# define _LIBCPP_STD_VER 14 82# elif __cplusplus <= 201703L 83# define _LIBCPP_STD_VER 17 84# elif __cplusplus <= 202002L 85# define _LIBCPP_STD_VER 20 86# elif __cplusplus <= 202302L 87# define _LIBCPP_STD_VER 23 88# else 89// Expected release year of the next C++ standard 90# define _LIBCPP_STD_VER 26 91# endif 92# endif // _LIBCPP_STD_VER 93// NOLINTEND(libcpp-cpp-version-check) 94 95# if defined(__ELF__) 96# define _LIBCPP_OBJECT_FORMAT_ELF 1 97# elif defined(__MACH__) 98# define _LIBCPP_OBJECT_FORMAT_MACHO 1 99# elif defined(_WIN32) 100# define _LIBCPP_OBJECT_FORMAT_COFF 1 101# elif defined(__wasm__) 102# define _LIBCPP_OBJECT_FORMAT_WASM 1 103# elif defined(_AIX) 104# define _LIBCPP_OBJECT_FORMAT_XCOFF 1 105# else 106// ... add new file formats here ... 107# endif 108 109// ABI { 110 111# if _LIBCPP_ABI_VERSION >= 2 112// Change short string representation so that string data starts at offset 0, 113// improving its alignment in some cases. 114# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 115// Fix deque iterator type in order to support incomplete types. 116# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE 117// Fix undefined behavior in how std::list stores its linked nodes. 118# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB 119// Fix undefined behavior in how __tree stores its end and parent nodes. 120# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB 121// Fix undefined behavior in how __hash_table stores its pointer types. 122# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB 123# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB 124# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE 125// Define a key function for `bad_function_call` in the library, to centralize 126// its vtable and typeinfo to libc++ rather than having all other libraries 127// using that class define their own copies. 128# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 129// Override the default return value of exception::what() for 130// bad_function_call::what() with a string that is specific to 131// bad_function_call (see http://wg21.link/LWG2233). This is an ABI break 132// because it changes the vtable layout of bad_function_call. 133# define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE 134// Enable optimized version of __do_get_(un)signed which avoids redundant copies. 135# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET 136// Give reverse_iterator<T> one data member of type T, not two. 137// Also, in C++17 and later, don't derive iterator types from std::iterator. 138# define _LIBCPP_ABI_NO_ITERATOR_BASES 139// Use the smallest possible integer type to represent the index of the variant. 140// Previously libc++ used "unsigned int" exclusively. 141# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION 142// Unstable attempt to provide a more optimized std::function 143# define _LIBCPP_ABI_OPTIMIZED_FUNCTION 144// All the regex constants must be distinct and nonzero. 145# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO 146// Re-worked external template instantiations for std::string with a focus on 147// performance and fast-path inlining. 148# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION 149// Enable clang::trivial_abi on std::unique_ptr. 150# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI 151// Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr 152# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI 153// std::random_device holds some state when it uses an implementation that gets 154// entropy from a file (see _LIBCPP_USING_DEV_RANDOM). When switching from this 155// implementation to another one on a platform that has already shipped 156// std::random_device, one needs to retain the same object layout to remain ABI 157// compatible. This switch removes these workarounds for platforms that don't care 158// about ABI compatibility. 159# define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT 160// Don't export the legacy __basic_string_common class and its methods from the built library. 161# define _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON 162// Don't export the legacy __vector_base_common class and its methods from the built library. 163# define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON 164// According to the Standard, `bitset::operator[] const` returns bool 165# define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL 166// Fix the implementation of CityHash used for std::hash<fundamental-type>. 167// This is an ABI break because `std::hash` will return a different result, 168// which means that hashing the same object in translation units built against 169// different versions of libc++ can return inconsistent results. This is especially 170// tricky since std::hash is used in the implementation of unordered containers. 171// 172// The incorrect implementation of CityHash has the problem that it drops some 173// bits on the floor. 174# define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION 175// Remove the base 10 implementation of std::to_chars from the dylib. 176// The implementation moved to the header, but we still export the symbols from 177// the dylib for backwards compatibility. 178# define _LIBCPP_ABI_DO_NOT_EXPORT_TO_CHARS_BASE_10 179# elif _LIBCPP_ABI_VERSION == 1 180# if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF)) 181// Enable compiling copies of now inline methods into the dylib to support 182// applications compiled against older libraries. This is unnecessary with 183// COFF dllexport semantics, since dllexport forces a non-inline definition 184// of inline functions to be emitted anyway. Our own non-inline copy would 185// conflict with the dllexport-emitted copy, so we disable it. For XCOFF, 186// the linker will take issue with the symbols in the shared object if the 187// weak inline methods get visibility (such as from -fvisibility-inlines-hidden), 188// so disable it. 189# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS 190# endif 191// Feature macros for disabling pre ABI v1 features. All of these options 192// are deprecated. 193# if defined(__FreeBSD__) 194# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR 195# endif 196// For XCOFF linkers, we have problems if we see a weak hidden version of a symbol 197// in user code (like you get with -fvisibility-inlines-hidden) and then a strong def 198// in the library, so we need to always rely on the library version. 199# if defined(_AIX) 200# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 201# endif 202# endif 203 204# if defined(_LIBCPP_BUILDING_LIBRARY) || _LIBCPP_ABI_VERSION >= 2 205// Define a key function for `bad_function_call` in the library, to centralize 206// its vtable and typeinfo to libc++ rather than having all other libraries 207// using that class define their own copies. 208# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION 209# endif 210 211// We had some bugs where we use [[no_unique_address]] together with construct_at, 212// which causes UB as the call on construct_at could write to overlapping subobjects 213// 214// https://github.com/llvm/llvm-project/issues/70506 215// https://github.com/llvm/llvm-project/issues/70494 216// 217// To fix the bug we had to change the ABI of some classes to remove [[no_unique_address]] under certain conditions. 218// The macro below is used for all classes whose ABI have changed as part of fixing these bugs. 219# define _LIBCPP_ABI_LLVM18_NO_UNIQUE_ADDRESS __attribute__((__abi_tag__("llvm18_nua"))) 220 221// Changes the iterator type of select containers (see below) to a bounded iterator that keeps track of whether it's 222// within the bounds of the original container and asserts it on every dereference. 223// 224// ABI impact: changes the iterator type of the relevant containers. 225// 226// Supported containers: 227// - `span`; 228// - `string_view`; 229// - `array`. 230// #define _LIBCPP_ABI_BOUNDED_ITERATORS 231 232// } ABI 233 234// HARDENING { 235 236// TODO(hardening): deprecate this in LLVM 19. 237// This is for backward compatibility -- make enabling `_LIBCPP_ENABLE_ASSERTIONS` (which predates hardening modes) 238// equivalent to setting the extensive mode. 239# ifdef _LIBCPP_ENABLE_ASSERTIONS 240# if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 1 241# error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1" 242# endif 243# if _LIBCPP_ENABLE_ASSERTIONS 244# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_EXTENSIVE 245# endif 246# endif 247 248// The library provides the macro `_LIBCPP_HARDENING_MODE` which can be set to one of the following values: 249// 250// - `_LIBCPP_HARDENING_MODE_NONE`; 251// - `_LIBCPP_HARDENING_MODE_FAST`; 252// - `_LIBCPP_HARDENING_MODE_EXTENSIVE`; 253// - `_LIBCPP_HARDENING_MODE_DEBUG`. 254// 255// These values have the following effects: 256// 257// - `_LIBCPP_HARDENING_MODE_NONE` -- sets the hardening mode to "none" which disables all runtime hardening checks; 258// 259// - `_LIBCPP_HARDENING_MODE_FAST` -- sets that hardening mode to "fast". The fast mode enables security-critical checks 260// that can be done with relatively little runtime overhead in constant time; 261// 262// - `_LIBCPP_HARDENING_MODE_EXTENSIVE` -- sets the hardening mode to "extensive". The extensive mode is a superset of 263// the fast mode that additionally enables checks that are relatively cheap and prevent common types of logic errors 264// but are not necessarily security-critical; 265// 266// - `_LIBCPP_HARDENING_MODE_DEBUG` -- sets the hardening mode to "debug". The debug mode is a superset of the extensive 267// mode and enables all checks available in the library, including internal assertions. Checks that are part of the 268// debug mode can be very expensive and thus the debug mode is intended to be used for testing, not in production. 269 270// Inside the library, assertions are categorized so they can be cherry-picked based on the chosen hardening mode. These 271// macros are only for internal use -- users should only pick one of the high-level hardening modes described above. 272// 273// - `_LIBCPP_ASSERT_VALID_INPUT_RANGE` -- checks that ranges (whether expressed as an iterator pair, an iterator and 274// a sentinel, an iterator and a count, or a `std::range`) given as input to library functions are valid: 275// - the sentinel is reachable from the begin iterator; 276// - TODO(hardening): both iterators refer to the same container. 277// 278// - `_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS` -- checks that any attempts to access a container element, whether through 279// the container object or through an iterator, are valid and do not attempt to go out of bounds or otherwise access 280// a non-existent element. For iterator checks to work, bounded iterators must be enabled in the ABI. Types like 281// `optional` and `function` are considered one-element containers for the purposes of this check. 282// 283// - `_LIBCPP_ASSERT_NON_NULL` -- checks that the pointer being dereferenced is not null. On most modern platforms zero 284// address does not refer to an actual location in memory, so a null pointer dereference would not compromize the 285// memory security of a program (however, it is still undefined behavior that can result in strange errors due to 286// compiler optimizations). 287// 288// - `_LIBCPP_ASSERT_NON_OVERLAPPING_RANGES` -- for functions that take several ranges as arguments, checks that the 289// given ranges do not overlap. 290// 291// - `_LIBCPP_ASSERT_VALID_DEALLOCATION` -- checks that an attempt to deallocate memory is valid (e.g. the given object 292// was allocated by the given allocator). Violating this category typically results in a memory leak. 293// 294// - `_LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL` -- checks that a call to an external API doesn't fail in 295// an unexpected manner. This includes triggering documented cases of undefined behavior in an external library (like 296// attempting to unlock an unlocked mutex in pthreads). Any API external to the library falls under this category 297// (from system calls to compiler intrinsics). We generally don't expect these failures to compromize memory safety or 298// otherwise create an immediate security issue. 299// 300// - `_LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR` -- checks any operations that exchange nodes between containers to make sure 301// the containers have compatible allocators. 302// 303// - `_LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN` -- checks that the given argument is within the domain of valid arguments 304// for the function. Violating this typically produces an incorrect result (e.g. the clamp algorithm returns the 305// original value without clamping it due to incorrect functors) or puts an object into an invalid state (e.g. 306// a string view where only a subset of elements is possible to access). This category is for assertions violating 307// which doesn't cause any immediate issues in the library -- whatever the consequences are, they will happen in the 308// user code. 309// 310// - `_LIBCPP_ASSERT_PEDANTIC` -- checks prerequisites which are imposed by the Standard, but violating which happens to 311// be benign in our implementation. 312// 313// - `_LIBCPP_ASSERT_SEMANTIC_REQUIREMENT` -- checks that the given argument satisfies the semantic requirements imposed 314// by the Standard. Typically, there is no simple way to completely prove that a semantic requirement is satisfied; 315// thus, this would often be a heuristic check and it might be quite expensive. 316// 317// - `_LIBCPP_ASSERT_INTERNAL` -- checks that internal invariants of the library hold. These assertions don't depend on 318// user input. 319// 320// - `_LIBCPP_ASSERT_UNCATEGORIZED` -- for assertions that haven't been properly classified yet. 321 322// clang-format off 323# define _LIBCPP_HARDENING_MODE_NONE (1 << 1) 324# define _LIBCPP_HARDENING_MODE_FAST (1 << 2) 325# define _LIBCPP_HARDENING_MODE_EXTENSIVE (1 << 4) // Deliberately not ordered. 326# define _LIBCPP_HARDENING_MODE_DEBUG (1 << 3) 327// clang-format on 328 329# ifndef _LIBCPP_HARDENING_MODE 330# define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_DEFAULT 331# endif 332 333# if _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_NONE && \ 334 _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_FAST && \ 335 _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_EXTENSIVE && \ 336 _LIBCPP_HARDENING_MODE != _LIBCPP_HARDENING_MODE_DEBUG 337# error _LIBCPP_HARDENING_MODE must be set to one of the following values: \ 338_LIBCPP_HARDENING_MODE_NONE, \ 339_LIBCPP_HARDENING_MODE_FAST, \ 340_LIBCPP_HARDENING_MODE_EXTENSIVE, \ 341_LIBCPP_HARDENING_MODE_DEBUG 342# endif 343 344// clang-format off 345// Fast hardening mode checks. 346 347# if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST 348 349// Enabled checks. 350# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSERT(expression, message) 351# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSERT(expression, message) 352// Disabled checks. 353// On most modern platforms, dereferencing a null pointer does not lead to an actual memory access. 354# define _LIBCPP_ASSERT_NON_NULL(expression, message) _LIBCPP_ASSUME(expression) 355// Overlapping ranges will make algorithms produce incorrect results but don't directly lead to a security 356// vulnerability. 357# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSUME(expression) 358# define _LIBCPP_ASSERT_VALID_DEALLOCATION(expression, message) _LIBCPP_ASSUME(expression) 359# define _LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL(expression, message) _LIBCPP_ASSUME(expression) 360# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSUME(expression) 361# define _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(expression, message) _LIBCPP_ASSUME(expression) 362# define _LIBCPP_ASSERT_PEDANTIC(expression, message) _LIBCPP_ASSUME(expression) 363# define _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(expression, message) _LIBCPP_ASSUME(expression) 364# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSUME(expression) 365# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSUME(expression) 366 367// Extensive hardening mode checks. 368 369# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE 370 371// Enabled checks. 372# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSERT(expression, message) 373# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSERT(expression, message) 374# define _LIBCPP_ASSERT_NON_NULL(expression, message) _LIBCPP_ASSERT(expression, message) 375# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSERT(expression, message) 376# define _LIBCPP_ASSERT_VALID_DEALLOCATION(expression, message) _LIBCPP_ASSERT(expression, message) 377# define _LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL(expression, message) _LIBCPP_ASSERT(expression, message) 378# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSERT(expression, message) 379# define _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(expression, message) _LIBCPP_ASSERT(expression, message) 380# define _LIBCPP_ASSERT_PEDANTIC(expression, message) _LIBCPP_ASSERT(expression, message) 381# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSERT(expression, message) 382// Disabled checks. 383# define _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(expression, message) _LIBCPP_ASSUME(expression) 384# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSUME(expression) 385 386// Debug hardening mode checks. 387 388# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG 389 390// All checks enabled. 391# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSERT(expression, message) 392# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSERT(expression, message) 393# define _LIBCPP_ASSERT_NON_NULL(expression, message) _LIBCPP_ASSERT(expression, message) 394# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSERT(expression, message) 395# define _LIBCPP_ASSERT_VALID_DEALLOCATION(expression, message) _LIBCPP_ASSERT(expression, message) 396# define _LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL(expression, message) _LIBCPP_ASSERT(expression, message) 397# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSERT(expression, message) 398# define _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(expression, message) _LIBCPP_ASSERT(expression, message) 399# define _LIBCPP_ASSERT_PEDANTIC(expression, message) _LIBCPP_ASSERT(expression, message) 400# define _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(expression, message) _LIBCPP_ASSERT(expression, message) 401# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSERT(expression, message) 402# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSERT(expression, message) 403 404// Disable all checks if hardening is not enabled. 405 406# else 407 408// All checks disabled. 409# define _LIBCPP_ASSERT_VALID_INPUT_RANGE(expression, message) _LIBCPP_ASSUME(expression) 410# define _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(expression, message) _LIBCPP_ASSUME(expression) 411# define _LIBCPP_ASSERT_NON_NULL(expression, message) _LIBCPP_ASSUME(expression) 412# define _LIBCPP_ASSERT_NON_OVERLAPPING_RANGES(expression, message) _LIBCPP_ASSUME(expression) 413# define _LIBCPP_ASSERT_VALID_DEALLOCATION(expression, message) _LIBCPP_ASSUME(expression) 414# define _LIBCPP_ASSERT_VALID_EXTERNAL_API_CALL(expression, message) _LIBCPP_ASSUME(expression) 415# define _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(expression, message) _LIBCPP_ASSUME(expression) 416# define _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(expression, message) _LIBCPP_ASSUME(expression) 417# define _LIBCPP_ASSERT_PEDANTIC(expression, message) _LIBCPP_ASSUME(expression) 418# define _LIBCPP_ASSERT_SEMANTIC_REQUIREMENT(expression, message) _LIBCPP_ASSUME(expression) 419# define _LIBCPP_ASSERT_INTERNAL(expression, message) _LIBCPP_ASSUME(expression) 420# define _LIBCPP_ASSERT_UNCATEGORIZED(expression, message) _LIBCPP_ASSUME(expression) 421 422# endif // _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST 423// clang-format on 424 425// } HARDENING 426 427# define _LIBCPP_TOSTRING2(x) #x 428# define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x) 429 430// NOLINTNEXTLINE(libcpp-cpp-version-check) 431# if __cplusplus < 201103L 432# define _LIBCPP_CXX03_LANG 433# endif 434 435# ifndef __has_attribute 436# define __has_attribute(__x) 0 437# endif 438 439# ifndef __has_builtin 440# define __has_builtin(__x) 0 441# endif 442 443# ifndef __has_extension 444# define __has_extension(__x) 0 445# endif 446 447# ifndef __has_feature 448# define __has_feature(__x) 0 449# endif 450 451# ifndef __has_cpp_attribute 452# define __has_cpp_attribute(__x) 0 453# endif 454 455# ifndef __has_constexpr_builtin 456# define __has_constexpr_builtin(x) 0 457# endif 458 459// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by 460// the compiler and '1' otherwise. 461# ifndef __is_identifier 462# define __is_identifier(__x) 1 463# endif 464 465# ifndef __has_declspec_attribute 466# define __has_declspec_attribute(__x) 0 467# endif 468 469# define __has_keyword(__x) !(__is_identifier(__x)) 470 471# ifndef __has_include 472# define __has_include(...) 0 473# endif 474 475# if !defined(_LIBCPP_COMPILER_CLANG_BASED) && __cplusplus < 201103L 476# error "libc++ only supports C++03 with Clang-based compilers. Please enable C++11" 477# endif 478 479// FIXME: ABI detection should be done via compiler builtin macros. This 480// is just a placeholder until Clang implements such macros. For now assume 481// that Windows compilers pretending to be MSVC++ target the Microsoft ABI, 482// and allow the user to explicitly specify the ABI to handle cases where this 483// heuristic falls short. 484# if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT) 485# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined" 486# elif defined(_LIBCPP_ABI_FORCE_ITANIUM) 487# define _LIBCPP_ABI_ITANIUM 488# elif defined(_LIBCPP_ABI_FORCE_MICROSOFT) 489# define _LIBCPP_ABI_MICROSOFT 490# else 491# if defined(_WIN32) && defined(_MSC_VER) 492# define _LIBCPP_ABI_MICROSOFT 493# else 494# define _LIBCPP_ABI_ITANIUM 495# endif 496# endif 497 498# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 499# define _LIBCPP_ABI_VCRUNTIME 500# endif 501 502# if __has_feature(experimental_library) 503# ifndef _LIBCPP_ENABLE_EXPERIMENTAL 504# define _LIBCPP_ENABLE_EXPERIMENTAL 505# endif 506# endif 507 508// Incomplete features get their own specific disabling flags. This makes it 509// easier to grep for target specific flags once the feature is complete. 510# if !defined(_LIBCPP_ENABLE_EXPERIMENTAL) && !defined(_LIBCPP_BUILDING_LIBRARY) 511# define _LIBCPP_HAS_NO_INCOMPLETE_PSTL 512# define _LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN 513# define _LIBCPP_HAS_NO_INCOMPLETE_TZDB 514# define _LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM 515# endif 516 517// Need to detect which libc we're using if we're on Linux. 518# if defined(__linux__) 519# include <features.h> 520# if defined(__GLIBC_PREREQ) 521# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b) 522# else 523# define _LIBCPP_GLIBC_PREREQ(a, b) 0 524# endif // defined(__GLIBC_PREREQ) 525# endif // defined(__linux__) 526 527# if defined(__MVS__) 528# include <features.h> // for __NATIVE_ASCII_F 529# endif 530 531# ifndef __BYTE_ORDER__ 532# error \ 533 "Your compiler doesn't seem to define __BYTE_ORDER__, which is required by libc++ to know the endianness of your target platform" 534# endif 535 536# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 537# define _LIBCPP_LITTLE_ENDIAN 538# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 539# define _LIBCPP_BIG_ENDIAN 540# endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 541 542# if defined(_WIN32) 543# define _LIBCPP_WIN32API 544# define _LIBCPP_SHORT_WCHAR 1 545// Both MinGW and native MSVC provide a "MSVC"-like environment 546# define _LIBCPP_MSVCRT_LIKE 547// If mingw not explicitly detected, assume using MS C runtime only if 548// a MS compatibility version is specified. 549# if defined(_MSC_VER) && !defined(__MINGW32__) 550# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library 551# endif 552# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__)) 553# define _LIBCPP_HAS_BITSCAN64 554# endif 555# define _LIBCPP_HAS_OPEN_WITH_WCHAR 556# endif // defined(_WIN32) 557 558# if defined(_AIX) && !defined(__64BIT__) 559// The size of wchar is 2 byte on 32-bit mode on AIX. 560# define _LIBCPP_SHORT_WCHAR 1 561# endif 562 563// Libc++ supports various implementations of std::random_device. 564// 565// _LIBCPP_USING_DEV_RANDOM 566// Read entropy from the given file, by default `/dev/urandom`. 567// If a token is provided, it is assumed to be the path to a file 568// to read entropy from. This is the default behavior if nothing 569// else is specified. This implementation requires storing state 570// inside `std::random_device`. 571// 572// _LIBCPP_USING_ARC4_RANDOM 573// Use arc4random(). This allows obtaining random data even when 574// using sandboxing mechanisms. On some platforms like Apple, this 575// is the recommended source of entropy for user-space programs. 576// When this option is used, the token passed to `std::random_device`'s 577// constructor *must* be "/dev/urandom" -- anything else is an error. 578// 579// _LIBCPP_USING_GETENTROPY 580// Use getentropy(). 581// When this option is used, the token passed to `std::random_device`'s 582// constructor *must* be "/dev/urandom" -- anything else is an error. 583// 584// _LIBCPP_USING_FUCHSIA_CPRNG 585// Use Fuchsia's zx_cprng_draw() system call, which is specified to 586// deliver high-quality entropy and cannot fail. 587// When this option is used, the token passed to `std::random_device`'s 588// constructor *must* be "/dev/urandom" -- anything else is an error. 589// 590// _LIBCPP_USING_NACL_RANDOM 591// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access, 592// including accesses to the special files under `/dev`. This implementation 593// uses the NaCL syscall `nacl_secure_random_init()` to get entropy. 594// When this option is used, the token passed to `std::random_device`'s 595// constructor *must* be "/dev/urandom" -- anything else is an error. 596// 597// _LIBCPP_USING_WIN32_RANDOM 598// Use rand_s(), for use on Windows. 599// When this option is used, the token passed to `std::random_device`'s 600// constructor *must* be "/dev/urandom" -- anything else is an error. 601# if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \ 602 defined(__DragonFly__) 603# define _LIBCPP_USING_ARC4_RANDOM 604# elif defined(__wasi__) || defined(__EMSCRIPTEN__) 605# define _LIBCPP_USING_GETENTROPY 606# elif defined(__Fuchsia__) 607# define _LIBCPP_USING_FUCHSIA_CPRNG 608# elif defined(__native_client__) 609# define _LIBCPP_USING_NACL_RANDOM 610# elif defined(_LIBCPP_WIN32API) 611# define _LIBCPP_USING_WIN32_RANDOM 612# else 613# define _LIBCPP_USING_DEV_RANDOM 614# endif 615 616# ifndef _LIBCPP_CXX03_LANG 617 618# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp) 619# define _ALIGNAS_TYPE(x) alignas(x) 620# define _ALIGNAS(x) alignas(x) 621# define _LIBCPP_NORETURN [[noreturn]] 622# define _NOEXCEPT noexcept 623# define _NOEXCEPT_(x) noexcept(x) 624# define _LIBCPP_CONSTEXPR constexpr 625 626# else 627 628# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp) 629# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x)))) 630# define _ALIGNAS(x) __attribute__((__aligned__(x))) 631# define _LIBCPP_NORETURN __attribute__((__noreturn__)) 632# define _LIBCPP_HAS_NO_NOEXCEPT 633# define nullptr __nullptr 634# define _NOEXCEPT throw() 635# define _NOEXCEPT_(x) 636# define static_assert(...) _Static_assert(__VA_ARGS__) 637# define decltype(...) __decltype(__VA_ARGS__) 638# define _LIBCPP_CONSTEXPR 639 640typedef __char16_t char16_t; 641typedef __char32_t char32_t; 642 643# endif 644 645# if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L 646# define _LIBCPP_HAS_NO_EXCEPTIONS 647# endif 648 649# define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp) 650 651# if defined(_LIBCPP_COMPILER_CLANG_BASED) 652 653# if defined(__APPLE__) 654# if defined(__i386__) || defined(__x86_64__) 655// use old string layout on x86_64 and i386 656# elif defined(__arm__) 657// use old string layout on arm (which does not include aarch64/arm64), except on watch ABIs 658# if defined(__ARM_ARCH_7K__) && __ARM_ARCH_7K__ >= 2 659# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 660# endif 661# else 662# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT 663# endif 664# endif 665 666// Objective-C++ features (opt-in) 667# if __has_feature(objc_arc) 668# define _LIBCPP_HAS_OBJC_ARC 669# endif 670 671# if __has_feature(objc_arc_weak) 672# define _LIBCPP_HAS_OBJC_ARC_WEAK 673# endif 674 675# if __has_extension(blocks) 676# define _LIBCPP_HAS_EXTENSION_BLOCKS 677# endif 678 679# if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__) 680# define _LIBCPP_HAS_BLOCKS_RUNTIME 681# endif 682 683# if !__has_feature(address_sanitizer) 684# define _LIBCPP_HAS_NO_ASAN 685# endif 686 687# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 688 689# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 690 691# elif defined(_LIBCPP_COMPILER_GCC) 692 693# if !defined(__SANITIZE_ADDRESS__) 694# define _LIBCPP_HAS_NO_ASAN 695# endif 696 697# define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__)) 698 699# define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__ 700 701# endif // _LIBCPP_COMPILER_[CLANG|GCC] 702 703# if defined(_LIBCPP_OBJECT_FORMAT_COFF) 704 705# ifdef _DLL 706# define _LIBCPP_CRT_FUNC __declspec(dllimport) 707# else 708# define _LIBCPP_CRT_FUNC 709# endif 710 711# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY)) 712# define _LIBCPP_DLL_VIS 713# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 714# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 715# define _LIBCPP_OVERRIDABLE_FUNC_VIS 716# define _LIBCPP_EXPORTED_FROM_ABI 717# elif defined(_LIBCPP_BUILDING_LIBRARY) 718# define _LIBCPP_DLL_VIS __declspec(dllexport) 719# if defined(__MINGW32__) 720# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 721# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 722# else 723# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS 724# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS 725# endif 726# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS 727# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport) 728# else 729# define _LIBCPP_DLL_VIS __declspec(dllimport) 730# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS 731# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 732# define _LIBCPP_OVERRIDABLE_FUNC_VIS 733# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport) 734# endif 735 736# define _LIBCPP_HIDDEN 737# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 738# define _LIBCPP_TEMPLATE_VIS 739# define _LIBCPP_TEMPLATE_DATA_VIS 740# define _LIBCPP_TYPE_VISIBILITY_DEFAULT 741 742# else 743 744# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 745# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis))) 746# else 747# define _LIBCPP_VISIBILITY(vis) 748# endif 749 750# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden") 751# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default") 752# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default") 753# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default") 754# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS 755 756// TODO: Make this a proper customization point or remove the option to override it. 757# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS 758# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default") 759# endif 760 761# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 762// The inline should be removed once PR32114 is resolved 763# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN 764# else 765# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS 766# endif 767 768// GCC doesn't support the type_visibility attribute, so we have to keep the visibility attribute on templates 769# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && !__has_attribute(__type_visibility__) 770# define _LIBCPP_TEMPLATE_VIS __attribute__((__visibility__("default"))) 771# else 772# define _LIBCPP_TEMPLATE_VIS 773# endif 774 775# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__) && \ 776 _LIBCPP_CLANG_VER >= 1500 // FreeBSD customization 777# define _LIBCPP_TYPE_VISIBILITY_DEFAULT __attribute__((__type_visibility__("default"))) 778# else 779# define _LIBCPP_TYPE_VISIBILITY_DEFAULT 780# endif 781 782# endif // defined(_LIBCPP_OBJECT_FORMAT_COFF) 783 784# if __has_attribute(exclude_from_explicit_instantiation) 785# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__)) 786# else 787// Try to approximate the effect of exclude_from_explicit_instantiation 788// (which is that entities are not assumed to be provided by explicit 789// template instantiations in the dylib) by always inlining those entities. 790# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE 791# endif 792 793# if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST 794# define _LIBCPP_HARDENING_SIG f 795# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE 796# define _LIBCPP_HARDENING_SIG s 797# elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG 798# define _LIBCPP_HARDENING_SIG d 799# else 800# define _LIBCPP_HARDENING_SIG n // "none" 801# endif 802 803# ifdef _LIBCPP_HAS_NO_EXCEPTIONS 804# define _LIBCPP_EXCEPTIONS_SIG n 805# else 806# define _LIBCPP_EXCEPTIONS_SIG e 807# endif 808 809# define _LIBCPP_ODR_SIGNATURE \ 810 _LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_EXCEPTIONS_SIG), _LIBCPP_VERSION) 811 812// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved 813// on two levels: 814// 1. The symbol is given hidden visibility, which ensures that users won't start exporting 815// symbols from their dynamic library by means of using the libc++ headers. This ensures 816// that those symbols stay private to the dynamic library in which it is defined. 817// 818// 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library. 819// This ensures that no ODR violation can arise from mixing two TUs compiled with different 820// versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the 821// program contains two definitions of a function, the ODR requires them to be token-by-token 822// equivalent, and the linker is allowed to pick either definition and discard the other one. 823// 824// For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled 825// *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs 826// compiled with different settings), the two definitions are both visible by the linker and they 827// have the same name, but they have a meaningfully different implementation (one throws an exception 828// and the other aborts the program). This violates the ODR and makes the program ill-formed, and in 829// practice what will happen is that the linker will pick one of the definitions at random and will 830// discard the other one. This can quite clearly lead to incorrect program behavior. 831// 832// A similar reasoning holds for many other properties that are ODR-affecting. Essentially any 833// property that causes the code of a function to differ from the code in another configuration 834// can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI 835// tag, but we encode the ones that we think are most important: library version, exceptions, and 836// hardening mode. 837// 838// Note that historically, solving this problem has been achieved in various ways, including 839// force-inlining all functions or giving internal linkage to all functions. Both these previous 840// solutions suffer from drawbacks that lead notably to code bloat. 841// 842// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend 843// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library. 844// 845// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions 846// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled 847// name of a virtual function is part of its ABI, since some architectures like arm64e can sign 848// the virtual function pointer in the vtable based on the mangled name of the function. Since 849// we use an ABI tag that changes with each released version, the mangled name of the virtual 850// function would change, which is incorrect. Note that it doesn't make much sense to change 851// the implementation of a virtual function in an ABI-incompatible way in the first place, 852// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable. 853// 854// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing 855// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and 856// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70. 857# ifndef _LIBCPP_NO_ABI_TAG 858# define _LIBCPP_HIDE_FROM_ABI \ 859 _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \ 860 __attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE)))) 861# else 862# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 863# endif 864# define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 865 866// This macro provides a HIDE_FROM_ABI equivalent that can be applied to extern 867// "C" function, as those lack mangling. 868# define _LIBCPP_HIDE_FROM_ABI_C _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION 869 870# ifdef _LIBCPP_BUILDING_LIBRARY 871# if _LIBCPP_ABI_VERSION > 1 872# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 873# else 874# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 875# endif 876# else 877# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI 878# endif 879 880// TODO(LLVM-19): Remove _LIBCPP_INLINE_VISIBILITY and _VSTD, which we're keeping around 881// only to ease the renaming for downstreams. 882# define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI 883# define _VSTD std 884 885// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect. 886// clang-format off 887# define _LIBCPP_BEGIN_NAMESPACE_STD namespace _LIBCPP_TYPE_VISIBILITY_DEFAULT std { \ 888 inline namespace _LIBCPP_ABI_NAMESPACE { 889# define _LIBCPP_END_NAMESPACE_STD }} 890 891# define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM _LIBCPP_BEGIN_NAMESPACE_STD \ 892 inline namespace __fs { namespace filesystem { 893 894# define _LIBCPP_END_NAMESPACE_FILESYSTEM _LIBCPP_END_NAMESPACE_STD }} 895// clang-format on 896 897# if __has_attribute(__enable_if__) 898# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, ""))) 899# endif 900 901# if !defined(__SIZEOF_INT128__) || defined(_MSC_VER) 902# define _LIBCPP_HAS_NO_INT128 903# endif 904 905# ifdef _LIBCPP_CXX03_LANG 906# define _LIBCPP_DECLARE_STRONG_ENUM(x) \ 907 struct _LIBCPP_EXPORTED_FROM_ABI x { \ 908 enum __lx 909// clang-format off 910# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \ 911 __lx __v_; \ 912 _LIBCPP_HIDE_FROM_ABI x(__lx __v) : __v_(__v) {} \ 913 _LIBCPP_HIDE_FROM_ABI explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \ 914 _LIBCPP_HIDE_FROM_ABI operator int() const { return __v_; } \ 915 }; 916// clang-format on 917 918# else // _LIBCPP_CXX03_LANG 919# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class x 920# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) 921# endif // _LIBCPP_CXX03_LANG 922 923# if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__) 924# define _LIBCPP_LOCALE__L_EXTENSIONS 1 925# endif 926 927# ifdef __FreeBSD__ 928# define _DECLARE_C99_LDBL_MATH 1 929# endif 930 931// If we are getting operator new from the MSVC CRT, then allocation overloads 932// for align_val_t were added in 19.12, aka VS 2017 version 15.3. 933# if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912 934# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 935# elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new) 936// We're deferring to Microsoft's STL to provide aligned new et al. We don't 937// have it unless the language feature test macro is defined. 938# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 939# elif defined(__MVS__) 940# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 941# endif 942 943# if defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || (!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606) 944# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 945# endif 946 947// It is not yet possible to use aligned_alloc() on all Apple platforms since 948// 10.15 was the first version to ship an implementation of aligned_alloc(). 949# if defined(__APPLE__) 950# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ 951 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) 952# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 953# endif 954# elif defined(__ANDROID__) && __ANDROID_API__ < 28 955// Android only provides aligned_alloc when targeting API 28 or higher. 956# define _LIBCPP_HAS_NO_C11_ALIGNED_ALLOC 957# endif 958 959# if defined(__APPLE__) || defined(__FreeBSD__) 960# define _LIBCPP_HAS_DEFAULTRUNELOCALE 961# endif 962 963# if defined(__APPLE__) || defined(__FreeBSD__) 964# define _LIBCPP_WCTYPE_IS_MASK 965# endif 966 967# if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t) 968# define _LIBCPP_HAS_NO_CHAR8_T 969# endif 970 971// Deprecation macros. 972// 973// Deprecations warnings are always enabled, except when users explicitly opt-out 974// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS. 975# if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS) 976# if __has_attribute(__deprecated__) 977# define _LIBCPP_DEPRECATED __attribute__((__deprecated__)) 978# define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m))) 979# elif _LIBCPP_STD_VER >= 14 980# define _LIBCPP_DEPRECATED [[deprecated]] 981# define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]] 982# else 983# define _LIBCPP_DEPRECATED 984# define _LIBCPP_DEPRECATED_(m) 985# endif 986# else 987# define _LIBCPP_DEPRECATED 988# define _LIBCPP_DEPRECATED_(m) 989# endif 990 991# if !defined(_LIBCPP_CXX03_LANG) 992# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED 993# else 994# define _LIBCPP_DEPRECATED_IN_CXX11 995# endif 996 997# if _LIBCPP_STD_VER >= 14 998# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED 999# else 1000# define _LIBCPP_DEPRECATED_IN_CXX14 1001# endif 1002 1003# if _LIBCPP_STD_VER >= 17 1004# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED 1005# else 1006# define _LIBCPP_DEPRECATED_IN_CXX17 1007# endif 1008 1009# if _LIBCPP_STD_VER >= 20 1010# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED 1011# else 1012# define _LIBCPP_DEPRECATED_IN_CXX20 1013# endif 1014 1015# if _LIBCPP_STD_VER >= 23 1016# define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED 1017# else 1018# define _LIBCPP_DEPRECATED_IN_CXX23 1019# endif 1020 1021# if !defined(_LIBCPP_HAS_NO_CHAR8_T) 1022# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED 1023# else 1024# define _LIBCPP_DEPRECATED_WITH_CHAR8_T 1025# endif 1026 1027// Macros to enter and leave a state where deprecation warnings are suppressed. 1028# if defined(_LIBCPP_COMPILER_CLANG_BASED) || defined(_LIBCPP_COMPILER_GCC) 1029# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \ 1030 _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated\"") \ 1031 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") 1032# define _LIBCPP_SUPPRESS_DEPRECATED_POP _Pragma("GCC diagnostic pop") 1033# else 1034# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH 1035# define _LIBCPP_SUPPRESS_DEPRECATED_POP 1036# endif 1037 1038# if _LIBCPP_STD_VER <= 11 1039# define _LIBCPP_EXPLICIT_SINCE_CXX14 1040# else 1041# define _LIBCPP_EXPLICIT_SINCE_CXX14 explicit 1042# endif 1043 1044# if _LIBCPP_STD_VER >= 23 1045# define _LIBCPP_EXPLICIT_SINCE_CXX23 explicit 1046# else 1047# define _LIBCPP_EXPLICIT_SINCE_CXX23 1048# endif 1049 1050# if _LIBCPP_STD_VER >= 14 1051# define _LIBCPP_CONSTEXPR_SINCE_CXX14 constexpr 1052# else 1053# define _LIBCPP_CONSTEXPR_SINCE_CXX14 1054# endif 1055 1056# if _LIBCPP_STD_VER >= 17 1057# define _LIBCPP_CONSTEXPR_SINCE_CXX17 constexpr 1058# else 1059# define _LIBCPP_CONSTEXPR_SINCE_CXX17 1060# endif 1061 1062# if _LIBCPP_STD_VER >= 20 1063# define _LIBCPP_CONSTEXPR_SINCE_CXX20 constexpr 1064# else 1065# define _LIBCPP_CONSTEXPR_SINCE_CXX20 1066# endif 1067 1068# if _LIBCPP_STD_VER >= 23 1069# define _LIBCPP_CONSTEXPR_SINCE_CXX23 constexpr 1070# else 1071# define _LIBCPP_CONSTEXPR_SINCE_CXX23 1072# endif 1073 1074# ifndef _LIBCPP_HAS_NO_ASAN 1075extern "C" _LIBCPP_EXPORTED_FROM_ABI void 1076__sanitizer_annotate_contiguous_container(const void*, const void*, const void*, const void*); 1077extern "C" _LIBCPP_EXPORTED_FROM_ABI void __sanitizer_annotate_double_ended_contiguous_container( 1078 const void*, const void*, const void*, const void*, const void*, const void*); 1079extern "C" _LIBCPP_EXPORTED_FROM_ABI int 1080__sanitizer_verify_double_ended_contiguous_container(const void*, const void*, const void*, const void*); 1081# endif 1082 1083// Try to find out if RTTI is disabled. 1084# if !defined(__cpp_rtti) || __cpp_rtti < 199711L 1085# define _LIBCPP_HAS_NO_RTTI 1086# endif 1087 1088# ifndef _LIBCPP_WEAK 1089# define _LIBCPP_WEAK __attribute__((__weak__)) 1090# endif 1091 1092// Thread API 1093// clang-format off 1094# if !defined(_LIBCPP_HAS_NO_THREADS) && \ 1095 !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \ 1096 !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \ 1097 !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 1098 1099# if defined(__FreeBSD__) || \ 1100 defined(__wasi__) || \ 1101 defined(__NetBSD__) || \ 1102 defined(__OpenBSD__) || \ 1103 defined(__NuttX__) || \ 1104 defined(__linux__) || \ 1105 defined(__GNU__) || \ 1106 defined(__APPLE__) || \ 1107 defined(__MVS__) || \ 1108 defined(_AIX) || \ 1109 defined(__EMSCRIPTEN__) 1110// clang-format on 1111# define _LIBCPP_HAS_THREAD_API_PTHREAD 1112# elif defined(__Fuchsia__) 1113// TODO(44575): Switch to C11 thread API when possible. 1114# define _LIBCPP_HAS_THREAD_API_PTHREAD 1115# elif defined(_LIBCPP_WIN32API) 1116# define _LIBCPP_HAS_THREAD_API_WIN32 1117# else 1118# error "No thread API" 1119# endif // _LIBCPP_HAS_THREAD_API 1120# endif // _LIBCPP_HAS_NO_THREADS 1121 1122# if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 1123# if defined(__ANDROID__) && __ANDROID_API__ >= 30 1124# define _LIBCPP_HAS_COND_CLOCKWAIT 1125# elif defined(_LIBCPP_GLIBC_PREREQ) 1126# if _LIBCPP_GLIBC_PREREQ(2, 30) 1127# define _LIBCPP_HAS_COND_CLOCKWAIT 1128# endif 1129# endif 1130# endif 1131 1132# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD) 1133# error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \ 1134 _LIBCPP_HAS_NO_THREADS is not defined. 1135# endif 1136 1137# if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL) 1138# error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \ 1139 _LIBCPP_HAS_NO_THREADS is defined. 1140# endif 1141 1142# if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS) 1143# error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \ 1144 _LIBCPP_HAS_NO_THREADS is defined. 1145# endif 1146 1147# if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__) 1148# define __STDCPP_THREADS__ 1 1149# endif 1150 1151// The glibc and Bionic implementation of pthreads implements 1152// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32 1153// mutexes have no destroy mechanism. 1154// 1155// This optimization can't be performed on Apple platforms, where 1156// pthread_mutex_destroy can allow the kernel to release resources. 1157// See https://llvm.org/D64298 for details. 1158// 1159// TODO(EricWF): Enable this optimization on Bionic after speaking to their 1160// respective stakeholders. 1161// clang-format off 1162# if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) || \ 1163 (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \ 1164 defined(_LIBCPP_HAS_THREAD_API_WIN32) 1165// clang-format on 1166# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION 1167# endif 1168 1169// Destroying a condvar is a nop on Windows. 1170// 1171// This optimization can't be performed on Apple platforms, where 1172// pthread_cond_destroy can allow the kernel to release resources. 1173// See https://llvm.org/D64298 for details. 1174// 1175// TODO(EricWF): This is potentially true for some pthread implementations 1176// as well. 1177# if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || defined(_LIBCPP_HAS_THREAD_API_WIN32) 1178# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION 1179# endif 1180 1181# if defined(__BIONIC__) || defined(__NuttX__) || defined(__Fuchsia__) || defined(__wasi__) || \ 1182 defined(_LIBCPP_HAS_MUSL_LIBC) || defined(__OpenBSD__) 1183# define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE 1184# endif 1185 1186# if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic) 1187# define _LIBCPP_HAS_C_ATOMIC_IMP 1188# elif defined(_LIBCPP_COMPILER_GCC) 1189# define _LIBCPP_HAS_GCC_ATOMIC_IMP 1190# endif 1191 1192# if !defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \ 1193 !defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP) 1194# define _LIBCPP_HAS_NO_ATOMIC_HEADER 1195# else 1196# ifndef _LIBCPP_ATOMIC_FLAG_TYPE 1197# define _LIBCPP_ATOMIC_FLAG_TYPE bool 1198# endif 1199# ifdef _LIBCPP_FREESTANDING 1200# define _LIBCPP_ATOMIC_ONLY_USE_BUILTINS 1201# endif 1202# endif 1203 1204# if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(__no_thread_safety_analysis__) 1205# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((__no_thread_safety_analysis__)) 1206# else 1207# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS 1208# endif 1209 1210# if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) 1211# if defined(__clang__) && __has_attribute(acquire_capability) 1212// Work around the attribute handling in clang. When both __declspec and 1213// __attribute__ are present, the processing goes awry preventing the definition 1214// of the types. In MinGW mode, __declspec evaluates to __attribute__, and thus 1215// combining the two does work. 1216# if !defined(_MSC_VER) 1217# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1218# endif 1219# endif 1220# endif 1221 1222# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS 1223# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x)) 1224# else 1225# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) 1226# endif 1227 1228# if _LIBCPP_STD_VER >= 20 1229# define _LIBCPP_CONSTINIT constinit 1230# elif __has_attribute(__require_constant_initialization__) 1231# define _LIBCPP_CONSTINIT __attribute__((__require_constant_initialization__)) 1232# else 1233# define _LIBCPP_CONSTINIT 1234# endif 1235 1236# if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__) 1237// The CUDA SDK contains an unfortunate definition for the __noinline__ macro, 1238// which breaks the regular __attribute__((__noinline__)) syntax. Therefore, 1239// when compiling for CUDA we use the non-underscored version of the noinline 1240// attribute. 1241// 1242// This is a temporary workaround and we still expect the CUDA SDK team to solve 1243// this issue properly in the SDK headers. 1244// 1245// See https://github.com/llvm/llvm-project/pull/73838 for more details. 1246# define _LIBCPP_NOINLINE __attribute__((noinline)) 1247# elif __has_attribute(__noinline__) 1248# define _LIBCPP_NOINLINE __attribute__((__noinline__)) 1249# else 1250# define _LIBCPP_NOINLINE 1251# endif 1252 1253// We often repeat things just for handling wide characters in the library. 1254// When wide characters are disabled, it can be useful to have a quick way of 1255// disabling it without having to resort to #if-#endif, which has a larger 1256// impact on readability. 1257# if defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS) 1258# define _LIBCPP_IF_WIDE_CHARACTERS(...) 1259# else 1260# define _LIBCPP_IF_WIDE_CHARACTERS(...) __VA_ARGS__ 1261# endif 1262 1263# if defined(_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES) 1264# define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR 1265# define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS 1266# define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE 1267# define _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS 1268# define _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION 1269# endif // _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES 1270 1271# if defined(_LIBCPP_ENABLE_CXX20_REMOVED_FEATURES) 1272# define _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS 1273# define _LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_VOID_SPECIALIZATION 1274# define _LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS 1275# define _LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS 1276# define _LIBCPP_ENABLE_CXX20_REMOVED_RAW_STORAGE_ITERATOR 1277# define _LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS 1278# endif // _LIBCPP_ENABLE_CXX20_REMOVED_FEATURES 1279 1280// clang-format off 1281# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh\")") _Pragma("push_macro(\"move\")") _Pragma("push_macro(\"erase\")") 1282# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh\")") _Pragma("pop_macro(\"move\")") _Pragma("pop_macro(\"erase\")") 1283// clang-format on 1284 1285# ifndef _LIBCPP_NO_AUTO_LINK 1286# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1287# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) 1288# pragma comment(lib, "c++.lib") 1289# else 1290# pragma comment(lib, "libc++.lib") 1291# endif 1292# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY) 1293# endif // _LIBCPP_NO_AUTO_LINK 1294 1295// Configures the fopen close-on-exec mode character, if any. This string will 1296// be appended to any mode string used by fstream for fopen/fdopen. 1297// 1298// Not all platforms support this, but it helps avoid fd-leaks on platforms that 1299// do. 1300# if defined(__BIONIC__) 1301# define _LIBCPP_FOPEN_CLOEXEC_MODE "e" 1302# else 1303# define _LIBCPP_FOPEN_CLOEXEC_MODE 1304# endif 1305 1306# if __has_cpp_attribute(msvc::no_unique_address) 1307// MSVC implements [[no_unique_address]] as a silent no-op currently. 1308// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.) 1309// However, MSVC implements [[msvc::no_unique_address]] which does what 1310// [[no_unique_address]] is supposed to do, in general. 1311 1312// Clang-cl does not yet (14.0) implement either [[no_unique_address]] or 1313// [[msvc::no_unique_address]] though. If/when it does implement 1314// [[msvc::no_unique_address]], this should be preferred though. 1315# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]] 1316# elif __has_cpp_attribute(no_unique_address) 1317# define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]] 1318# else 1319# define _LIBCPP_NO_UNIQUE_ADDRESS /* nothing */ 1320// Note that this can be replaced by #error as soon as clang-cl 1321// implements msvc::no_unique_address, since there should be no C++20 1322// compiler that doesn't support one of the two attributes at that point. 1323// We generally don't want to use this macro outside of C++20-only code, 1324// because using it conditionally in one language version only would make 1325// the ABI inconsistent. 1326# endif 1327 1328# ifdef _LIBCPP_COMPILER_CLANG_BASED 1329# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("clang diagnostic push") 1330# define _LIBCPP_DIAGNOSTIC_POP _Pragma("clang diagnostic pop") 1331# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(clang diagnostic ignored str)) 1332# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 1333# elif defined(_LIBCPP_COMPILER_GCC) 1334# define _LIBCPP_DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push") 1335# define _LIBCPP_DIAGNOSTIC_POP _Pragma("GCC diagnostic pop") 1336# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 1337# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) _Pragma(_LIBCPP_TOSTRING(GCC diagnostic ignored str)) 1338# else 1339# define _LIBCPP_DIAGNOSTIC_PUSH 1340# define _LIBCPP_DIAGNOSTIC_POP 1341# define _LIBCPP_CLANG_DIAGNOSTIC_IGNORED(str) 1342# define _LIBCPP_GCC_DIAGNOSTIC_IGNORED(str) 1343# endif 1344 1345// c8rtomb() and mbrtoc8() were added in C++20 and C23. Support for these 1346// functions is gradually being added to existing C libraries. The conditions 1347// below check for known C library versions and conditions under which these 1348// functions are declared by the C library. 1349# define _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 1350// GNU libc 2.36 and newer declare c8rtomb() and mbrtoc8() in C++ modes if 1351// __cpp_char8_t is defined or if C2X extensions are enabled. Determining 1352// the latter depends on internal GNU libc details that are not appropriate 1353// to depend on here, so any declarations present when __cpp_char8_t is not 1354// defined are ignored. 1355# if defined(_LIBCPP_GLIBC_PREREQ) 1356# if _LIBCPP_GLIBC_PREREQ(2, 36) && defined(__cpp_char8_t) 1357# undef _LIBCPP_HAS_NO_C8RTOMB_MBRTOC8 1358# endif 1359# endif 1360 1361// There are a handful of public standard library types that are intended to 1362// support CTAD but don't need any explicit deduction guides to do so. This 1363// macro is used to mark them as such, which suppresses the 1364// '-Wctad-maybe-unsupported' compiler warning when CTAD is used in user code 1365// with these classes. 1366# if _LIBCPP_STD_VER >= 17 1367# ifdef _LIBCPP_COMPILER_CLANG_BASED 1368# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) \ 1369 template <class... _Tag> \ 1370 [[maybe_unused]] _ClassName(typename _Tag::__allow_ctad...)->_ClassName<_Tag...> 1371# else 1372# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(ClassName) \ 1373 template <class... _Tag> \ 1374 ClassName(typename _Tag::__allow_ctad...)->ClassName<_Tag...> 1375# endif 1376# else 1377# define _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(_ClassName) static_assert(true, "") 1378# endif 1379 1380// TODO(varconst): currently, there are bugs in Clang's intrinsics when handling Objective-C++ `id`, so don't use 1381// compiler intrinsics in the Objective-C++ mode. 1382# ifdef __OBJC__ 1383# define _LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS 1384# endif 1385 1386# define _PSTL_PRAGMA(x) _Pragma(#x) 1387 1388// Enable SIMD for compilers that support OpenMP 4.0 1389# if (defined(_OPENMP) && _OPENMP >= 201307) 1390 1391# define _PSTL_UDR_PRESENT 1392# define _PSTL_PRAGMA_SIMD _PSTL_PRAGMA(omp simd) 1393# define _PSTL_PRAGMA_DECLARE_SIMD _PSTL_PRAGMA(omp declare simd) 1394# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _PSTL_PRAGMA(omp simd reduction(PRM)) 1395# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _PSTL_PRAGMA(omp simd reduction(inscan, PRM)) 1396# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan inclusive(PRM)) 1397# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) _PSTL_PRAGMA(omp scan exclusive(PRM)) 1398 1399// Declaration of reduction functor, where 1400// NAME - the name of the functor 1401// OP - type of the callable object with the reduction operation 1402// omp_in - refers to the local partial result 1403// omp_out - refers to the final value of the combiner operator 1404// omp_priv - refers to the private copy of the initial value 1405// omp_orig - refers to the original variable to be reduced 1406# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) \ 1407 _PSTL_PRAGMA(omp declare reduction(NAME:OP : omp_out(omp_in)) initializer(omp_priv = omp_orig)) 1408 1409# elif defined(_LIBCPP_COMPILER_CLANG_BASED) 1410 1411# define _PSTL_PRAGMA_SIMD _Pragma("clang loop vectorize(enable) interleave(enable)") 1412# define _PSTL_PRAGMA_DECLARE_SIMD 1413# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)") 1414# define _PSTL_PRAGMA_SIMD_SCAN(PRM) _Pragma("clang loop vectorize(enable) interleave(enable)") 1415# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 1416# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 1417# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) 1418 1419# else // (defined(_OPENMP) && _OPENMP >= 201307) 1420 1421# define _PSTL_PRAGMA_SIMD 1422# define _PSTL_PRAGMA_DECLARE_SIMD 1423# define _PSTL_PRAGMA_SIMD_REDUCTION(PRM) 1424# define _PSTL_PRAGMA_SIMD_SCAN(PRM) 1425# define _PSTL_PRAGMA_SIMD_INCLUSIVE_SCAN(PRM) 1426# define _PSTL_PRAGMA_SIMD_EXCLUSIVE_SCAN(PRM) 1427# define _PSTL_PRAGMA_DECLARE_REDUCTION(NAME, OP) 1428 1429# endif // (defined(_OPENMP) && _OPENMP >= 201307) 1430 1431# define _PSTL_USE_NONTEMPORAL_STORES_IF_ALLOWED 1432 1433// Optional attributes - these are useful for a better QoI, but not required to be available 1434 1435# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC) 1436# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi"))) 1437# else 1438# define _LIBCPP_NO_CFI 1439# endif 1440 1441# if __has_attribute(__malloc__) 1442# define _LIBCPP_NOALIAS __attribute__((__malloc__)) 1443# else 1444# define _LIBCPP_NOALIAS 1445# endif 1446 1447# if __has_attribute(__using_if_exists__) 1448# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__)) 1449# else 1450# define _LIBCPP_USING_IF_EXISTS 1451# endif 1452 1453# if __has_cpp_attribute(nodiscard) 1454# define _LIBCPP_NODISCARD [[__nodiscard__]] 1455# else 1456// We can't use GCC's [[gnu::warn_unused_result]] and 1457// __attribute__((warn_unused_result)), because GCC does not silence them via 1458// (void) cast. 1459# define _LIBCPP_NODISCARD 1460# endif 1461 1462// _LIBCPP_NODISCARD_EXT may be used to apply [[nodiscard]] to entities not 1463// specified as such as an extension. 1464# if !defined(_LIBCPP_DISABLE_NODISCARD_EXT) 1465# define _LIBCPP_NODISCARD_EXT _LIBCPP_NODISCARD 1466# else 1467# define _LIBCPP_NODISCARD_EXT 1468# endif 1469 1470# if _LIBCPP_STD_VER >= 20 || !defined(_LIBCPP_DISABLE_NODISCARD_EXT) 1471# define _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_NODISCARD 1472# else 1473# define _LIBCPP_NODISCARD_AFTER_CXX17 1474# endif 1475 1476# if __has_attribute(__no_destroy__) 1477# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__)) 1478# else 1479# define _LIBCPP_NO_DESTROY 1480# endif 1481 1482# if __has_attribute(__diagnose_if__) && !defined(_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS) 1483# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning"))) 1484# else 1485# define _LIBCPP_DIAGNOSE_WARNING(...) 1486# endif 1487 1488// Use a function like macro to imply that it must be followed by a semicolon 1489# if __has_cpp_attribute(fallthrough) 1490# define _LIBCPP_FALLTHROUGH() [[fallthrough]] 1491# elif __has_attribute(__fallthrough__) 1492# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__)) 1493# else 1494# define _LIBCPP_FALLTHROUGH() ((void)0) 1495# endif 1496 1497# if __has_cpp_attribute(_Clang::__lifetimebound__) 1498# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]] 1499# else 1500# define _LIBCPP_LIFETIMEBOUND 1501# endif 1502 1503# if __has_attribute(__nodebug__) 1504# define _LIBCPP_NODEBUG __attribute__((__nodebug__)) 1505# else 1506# define _LIBCPP_NODEBUG 1507# endif 1508 1509# if __has_attribute(__standalone_debug__) 1510# define _LIBCPP_STANDALONE_DEBUG __attribute__((__standalone_debug__)) 1511# else 1512# define _LIBCPP_STANDALONE_DEBUG 1513# endif 1514 1515# if __has_attribute(__preferred_name__) 1516# define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x))) 1517# else 1518# define _LIBCPP_PREFERRED_NAME(x) 1519# endif 1520 1521# if __has_attribute(__no_sanitize__) 1522# define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__))) 1523# else 1524# define _LIBCPP_NO_SANITIZE(...) 1525# endif 1526 1527# if __has_attribute(__init_priority__) 1528# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100))) 1529# else 1530# define _LIBCPP_INIT_PRIORITY_MAX 1531# endif 1532 1533# if __has_attribute(__format__) 1534// The attribute uses 1-based indices for ordinary and static member functions. 1535// The attribute uses 2-based indices for non-static member functions. 1536# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \ 1537 __attribute__((__format__(archetype, format_string_index, first_format_arg_index))) 1538# else 1539# define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) /* nothing */ 1540# endif 1541 1542# if __has_attribute(__packed__) 1543# define _LIBCPP_PACKED __attribute__((__packed__)) 1544# else 1545# define _LIBCPP_PACKED 1546# endif 1547 1548# if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases) 1549# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases) 1550# else 1551# define _LIBCPP_DECLSPEC_EMPTY_BASES 1552# endif 1553 1554// Allow for build-time disabling of unsigned integer sanitization 1555# if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC) 1556# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow"))) 1557# else 1558# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK 1559# endif 1560 1561// Clang-18 has support for deducing this, but it does not set the FTM. 1562# if defined(__cpp_explicit_this_parameter) || (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 1800) 1563# define _LIBCPP_HAS_EXPLICIT_THIS_PARAMETER 1564# endif 1565 1566#endif // __cplusplus 1567 1568#endif // _LIBCPP___CONFIG 1569