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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___CONFIGURATION_ABI_H |
| 11 | #define _LIBCPP___CXX03___CONFIGURATION_ABI_H |
| 12 | |
| 13 | #include <__cxx03/__configuration/compiler.h> |
| 14 | #include <__cxx03/__configuration/config_site_shim.h> |
| 15 | #include <__cxx03/__configuration/platform.h> |
| 16 | |
| 17 | #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER |
| 18 | # pragma GCC system_header |
| 19 | #endif |
| 20 | |
| 21 | #if _LIBCPP_ABI_VERSION >= 2 |
| 22 | // Change short string representation so that string data starts at offset 0, |
| 23 | // improving its alignment in some cases. |
| 24 | # define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT |
| 25 | // Fix deque iterator type in order to support incomplete types. |
| 26 | # define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE |
| 27 | // Fix undefined behavior in how std::list stores its linked nodes. |
| 28 | # define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB |
| 29 | // Fix undefined behavior in how __tree stores its end and parent nodes. |
| 30 | # define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB |
| 31 | // Fix undefined behavior in how __hash_table stores its pointer types. |
| 32 | # define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB |
| 33 | # define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB |
| 34 | # define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE |
| 35 | // Override the default return value of exception::what() for bad_function_call::what() |
| 36 | // with a string that is specific to bad_function_call (see http://wg21.link/LWG2233). |
| 37 | // This is an ABI break on platforms that sign and authenticate vtable function pointers |
| 38 | // because it changes the mangling of the virtual function located in the vtable, which |
| 39 | // changes how it gets signed. |
| 40 | # define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE |
| 41 | // Enable optimized version of __do_get_(un)signed which avoids redundant copies. |
| 42 | # define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET |
| 43 | // Give reverse_iterator<T> one data member of type T, not two. |
| 44 | // Also, in C++17 and later, don't derive iterator types from std::iterator. |
| 45 | # define _LIBCPP_ABI_NO_ITERATOR_BASES |
| 46 | // Use the smallest possible integer type to represent the index of the variant. |
| 47 | // Previously libc++ used "unsigned int" exclusively. |
| 48 | # define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION |
| 49 | // Unstable attempt to provide a more optimized std::function |
| 50 | # define _LIBCPP_ABI_OPTIMIZED_FUNCTION |
| 51 | // All the regex constants must be distinct and nonzero. |
| 52 | # define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO |
| 53 | // Re-worked external template instantiations for std::string with a focus on |
| 54 | // performance and fast-path inlining. |
| 55 | # define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION |
| 56 | // Enable clang::trivial_abi on std::unique_ptr. |
| 57 | # define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI |
| 58 | // Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr |
| 59 | # define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI |
| 60 | // std::random_device holds some state when it uses an implementation that gets |
| 61 | // entropy from a file (see _LIBCPP_USING_DEV_RANDOM). When switching from this |
| 62 | // implementation to another one on a platform that has already shipped |
| 63 | // std::random_device, one needs to retain the same object layout to remain ABI |
| 64 | // compatible. This switch removes these workarounds for platforms that don't care |
| 65 | // about ABI compatibility. |
| 66 | # define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT |
| 67 | // Don't export the legacy __basic_string_common class and its methods from the built library. |
| 68 | # define _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON |
| 69 | // Don't export the legacy __vector_base_common class and its methods from the built library. |
| 70 | # define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON |
| 71 | // According to the Standard, `bitset::operator[] const` returns bool |
| 72 | # define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL |
| 73 | // Fix the implementation of CityHash used for std::hash<fundamental-type>. |
| 74 | // This is an ABI break because `std::hash` will return a different result, |
| 75 | // which means that hashing the same object in translation units built against |
| 76 | // different versions of libc++ can return inconsistent results. This is especially |
| 77 | // tricky since std::hash is used in the implementation of unordered containers. |
| 78 | // |
| 79 | // The incorrect implementation of CityHash has the problem that it drops some |
| 80 | // bits on the floor. |
| 81 | # define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION |
| 82 | // Remove the base 10 implementation of std::to_chars from the dylib. |
| 83 | // The implementation moved to the header, but we still export the symbols from |
| 84 | // the dylib for backwards compatibility. |
| 85 | # define _LIBCPP_ABI_DO_NOT_EXPORT_TO_CHARS_BASE_10 |
| 86 | // Define std::array/std::string_view iterators to be __wrap_iters instead of raw |
| 87 | // pointers, which prevents people from relying on a non-portable implementation |
| 88 | // detail. This is especially useful because enabling bounded iterators hardening |
| 89 | // requires code not to make these assumptions. |
| 90 | # define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_ARRAY |
| 91 | # define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_STRING_VIEW |
| 92 | // Dont' add an inline namespace for `std::filesystem` |
| 93 | # define _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE |
| 94 | // std::basic_ios uses WEOF to indicate that the fill value is |
| 95 | // uninitialized. However, on platforms where the size of char_type is |
| 96 | // equal to or greater than the size of int_type and char_type is unsigned, |
| 97 | // std::char_traits<char_type>::eq_int_type() cannot distinguish between WEOF |
| 98 | // and WCHAR_MAX. This ABI setting determines whether we should instead track whether the fill |
| 99 | // value has been initialized using a separate boolean, which changes the ABI. |
| 100 | # define _LIBCPP_ABI_IOS_ALLOW_ARBITRARY_FILL_VALUE |
| 101 | // Make a std::pair of trivially copyable types trivially copyable. |
| 102 | // While this technically doesn't change the layout of pair itself, other types may decide to programatically change |
| 103 | // their representation based on whether something is trivially copyable. |
| 104 | # define _LIBCPP_ABI_TRIVIALLY_COPYABLE_PAIR |
| 105 | #elif _LIBCPP_ABI_VERSION == 1 |
| 106 | # if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF)) |
| 107 | // Enable compiling copies of now inline methods into the dylib to support |
| 108 | // applications compiled against older libraries. This is unnecessary with |
| 109 | // COFF dllexport semantics, since dllexport forces a non-inline definition |
| 110 | // of inline functions to be emitted anyway. Our own non-inline copy would |
| 111 | // conflict with the dllexport-emitted copy, so we disable it. For XCOFF, |
| 112 | // the linker will take issue with the symbols in the shared object if the |
| 113 | // weak inline methods get visibility (such as from -fvisibility-inlines-hidden), |
| 114 | // so disable it. |
| 115 | # define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS |
| 116 | # endif |
| 117 | // Feature macros for disabling pre ABI v1 features. All of these options |
| 118 | // are deprecated. |
| 119 | # if defined(__FreeBSD__) |
| 120 | # define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR |
| 121 | # endif |
| 122 | #endif |
| 123 | |
| 124 | // We had some bugs where we use [[no_unique_address]] together with construct_at, |
| 125 | // which causes UB as the call on construct_at could write to overlapping subobjects |
| 126 | // |
| 127 | // https://github.com/llvm/llvm-project/issues/70506 |
| 128 | // https://github.com/llvm/llvm-project/issues/70494 |
| 129 | // |
| 130 | // To fix the bug we had to change the ABI of some classes to remove [[no_unique_address]] under certain conditions. |
| 131 | // The macro below is used for all classes whose ABI have changed as part of fixing these bugs. |
| 132 | #define _LIBCPP_ABI_LLVM18_NO_UNIQUE_ADDRESS __attribute__((__abi_tag__("llvm18_nua"))) |
| 133 | |
| 134 | // Changes the iterator type of select containers (see below) to a bounded iterator that keeps track of whether it's |
| 135 | // within the bounds of the original container and asserts it on every dereference. |
| 136 | // |
| 137 | // ABI impact: changes the iterator type of the relevant containers. |
| 138 | // |
| 139 | // Supported containers: |
| 140 | // - `span`; |
| 141 | // - `string_view`. |
| 142 | // #define _LIBCPP_ABI_BOUNDED_ITERATORS |
| 143 | |
| 144 | // Changes the iterator type of `basic_string` to a bounded iterator that keeps track of whether it's within the bounds |
| 145 | // of the original container and asserts it on every dereference and when performing iterator arithmetics. |
| 146 | // |
| 147 | // ABI impact: changes the iterator type of `basic_string` and its specializations, such as `string` and `wstring`. |
| 148 | // #define _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING |
| 149 | |
| 150 | // Changes the iterator type of `vector` to a bounded iterator that keeps track of whether it's within the bounds of the |
| 151 | // original container and asserts it on every dereference and when performing iterator arithmetics. Note: this doesn't |
| 152 | // yet affect `vector<bool>`. |
| 153 | // |
| 154 | // ABI impact: changes the iterator type of `vector` (except `vector<bool>`). |
| 155 | // #define _LIBCPP_ABI_BOUNDED_ITERATORS_IN_VECTOR |
| 156 | |
| 157 | #if defined(_LIBCPP_COMPILER_CLANG_BASED) |
| 158 | # if defined(__APPLE__) |
| 159 | # if defined(__i386__) || defined(__x86_64__) |
| 160 | // use old string layout on x86_64 and i386 |
| 161 | # elif defined(__arm__) |
| 162 | // use old string layout on arm (which does not include aarch64/arm64), except on watch ABIs |
| 163 | # if defined(__ARM_ARCH_7K__) && __ARM_ARCH_7K__ >= 2 |
| 164 | # define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT |
| 165 | # endif |
| 166 | # else |
| 167 | # define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT |
| 168 | # endif |
| 169 | # endif |
| 170 | #endif |
| 171 | |
| 172 | #endif // _LIBCPP___CXX03___CONFIGURATION_ABI_H |
| 173 |
Warning: This file is not a C or C++ file. It does not have highlighting.