mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 06:53:33 +00:00
159 lines
8.3 KiB
C++
159 lines
8.3 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___CONFIGURATION_ABI_H
|
|
#define _LIBCPP___CONFIGURATION_ABI_H
|
|
|
|
#include <__config_site>
|
|
#include <__configuration/compiler.h>
|
|
#include <__configuration/platform.h>
|
|
|
|
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
#if _LIBCPP_ABI_VERSION >= 2
|
|
// Change short string representation so that string data starts at offset 0,
|
|
// improving its alignment in some cases.
|
|
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
|
|
// Fix deque iterator type in order to support incomplete types.
|
|
# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE
|
|
// Fix undefined behavior in how std::list stores its linked nodes.
|
|
# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB
|
|
// Fix undefined behavior in how __tree stores its end and parent nodes.
|
|
# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB
|
|
// Fix undefined behavior in how __hash_table stores its pointer types.
|
|
# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB
|
|
# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB
|
|
# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE
|
|
// Override the default return value of exception::what() for bad_function_call::what()
|
|
// with a string that is specific to bad_function_call (see http://wg21.link/LWG2233).
|
|
// This is an ABI break on platforms that sign and authenticate vtable function pointers
|
|
// because it changes the mangling of the virtual function located in the vtable, which
|
|
// changes how it gets signed.
|
|
# define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
|
|
// Enable optimized version of __do_get_(un)signed which avoids redundant copies.
|
|
# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET
|
|
// Give reverse_iterator<T> one data member of type T, not two.
|
|
// Also, in C++17 and later, don't derive iterator types from std::iterator.
|
|
# define _LIBCPP_ABI_NO_ITERATOR_BASES
|
|
// Use the smallest possible integer type to represent the index of the variant.
|
|
// Previously libc++ used "unsigned int" exclusively.
|
|
# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION
|
|
// Unstable attempt to provide a more optimized std::function
|
|
# define _LIBCPP_ABI_OPTIMIZED_FUNCTION
|
|
// All the regex constants must be distinct and nonzero.
|
|
# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO
|
|
// Re-worked external template instantiations for std::string with a focus on
|
|
// performance and fast-path inlining.
|
|
# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
|
|
// Enable clang::trivial_abi on std::unique_ptr.
|
|
# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
|
|
// Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr
|
|
# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
|
|
// std::random_device holds some state when it uses an implementation that gets
|
|
// entropy from a file (see _LIBCPP_USING_DEV_RANDOM). When switching from this
|
|
// implementation to another one on a platform that has already shipped
|
|
// std::random_device, one needs to retain the same object layout to remain ABI
|
|
// compatible. This switch removes these workarounds for platforms that don't care
|
|
// about ABI compatibility.
|
|
# define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT
|
|
// Don't export the legacy __basic_string_common class and its methods from the built library.
|
|
# define _LIBCPP_ABI_DO_NOT_EXPORT_BASIC_STRING_COMMON
|
|
// Don't export the legacy __vector_base_common class and its methods from the built library.
|
|
# define _LIBCPP_ABI_DO_NOT_EXPORT_VECTOR_BASE_COMMON
|
|
// According to the Standard, `bitset::operator[] const` returns bool
|
|
# define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL
|
|
// Fix the implementation of CityHash used for std::hash<fundamental-type>.
|
|
// This is an ABI break because `std::hash` will return a different result,
|
|
// which means that hashing the same object in translation units built against
|
|
// different versions of libc++ can return inconsistent results. This is especially
|
|
// tricky since std::hash is used in the implementation of unordered containers.
|
|
//
|
|
// The incorrect implementation of CityHash has the problem that it drops some
|
|
// bits on the floor.
|
|
# define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION
|
|
// Remove the base 10 implementation of std::to_chars from the dylib.
|
|
// The implementation moved to the header, but we still export the symbols from
|
|
// the dylib for backwards compatibility.
|
|
# define _LIBCPP_ABI_DO_NOT_EXPORT_TO_CHARS_BASE_10
|
|
// Define std::array/std::string_view iterators to be __wrap_iters instead of raw
|
|
// pointers, which prevents people from relying on a non-portable implementation
|
|
// detail. This is especially useful because enabling bounded iterators hardening
|
|
// requires code not to make these assumptions.
|
|
# define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_ARRAY
|
|
# define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_STRING_VIEW
|
|
// Dont' add an inline namespace for `std::filesystem`
|
|
# define _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE
|
|
// std::basic_ios uses WEOF to indicate that the fill value is
|
|
// uninitialized. However, on platforms where the size of char_type is
|
|
// equal to or greater than the size of int_type and char_type is unsigned,
|
|
// std::char_traits<char_type>::eq_int_type() cannot distinguish between WEOF
|
|
// and WCHAR_MAX. This ABI setting determines whether we should instead track whether the fill
|
|
// value has been initialized using a separate boolean, which changes the ABI.
|
|
# define _LIBCPP_ABI_IOS_ALLOW_ARBITRARY_FILL_VALUE
|
|
// Make a std::pair of trivially copyable types trivially copyable.
|
|
// While this technically doesn't change the layout of pair itself, other types may decide to programatically change
|
|
// their representation based on whether something is trivially copyable.
|
|
# define _LIBCPP_ABI_TRIVIALLY_COPYABLE_PAIR
|
|
#elif _LIBCPP_ABI_VERSION == 1
|
|
# if !(defined(_LIBCPP_OBJECT_FORMAT_COFF) || defined(_LIBCPP_OBJECT_FORMAT_XCOFF))
|
|
// Enable compiling copies of now inline methods into the dylib to support
|
|
// applications compiled against older libraries. This is unnecessary with
|
|
// COFF dllexport semantics, since dllexport forces a non-inline definition
|
|
// of inline functions to be emitted anyway. Our own non-inline copy would
|
|
// conflict with the dllexport-emitted copy, so we disable it. For XCOFF,
|
|
// the linker will take issue with the symbols in the shared object if the
|
|
// weak inline methods get visibility (such as from -fvisibility-inlines-hidden),
|
|
// so disable it.
|
|
# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS
|
|
# endif
|
|
// Feature macros for disabling pre ABI v1 features. All of these options
|
|
// are deprecated.
|
|
# if defined(__FreeBSD__) && __FreeBSD__ < 14
|
|
# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR
|
|
# endif
|
|
#endif
|
|
|
|
// We had some bugs where we use [[no_unique_address]] together with construct_at,
|
|
// which causes UB as the call on construct_at could write to overlapping subobjects
|
|
//
|
|
// https://github.com/llvm/llvm-project/issues/70506
|
|
// https://github.com/llvm/llvm-project/issues/70494
|
|
//
|
|
// To fix the bug we had to change the ABI of some classes to remove [[no_unique_address]] under certain conditions.
|
|
// The macro below is used for all classes whose ABI have changed as part of fixing these bugs.
|
|
#define _LIBCPP_ABI_LLVM18_NO_UNIQUE_ADDRESS __attribute__((__abi_tag__("llvm18_nua")))
|
|
|
|
// Changes the iterator type of select containers (see below) to a bounded iterator that keeps track of whether it's
|
|
// within the bounds of the original container and asserts it on every dereference.
|
|
//
|
|
// ABI impact: changes the iterator type of the relevant containers.
|
|
//
|
|
// Supported containers:
|
|
// - `span`;
|
|
// - `string_view`.
|
|
// #define _LIBCPP_ABI_BOUNDED_ITERATORS
|
|
|
|
#if defined(_LIBCPP_COMPILER_CLANG_BASED)
|
|
# if defined(__APPLE__)
|
|
# if defined(__i386__) || defined(__x86_64__)
|
|
// use old string layout on x86_64 and i386
|
|
# elif defined(__arm__)
|
|
// use old string layout on arm (which does not include aarch64/arm64), except on watch ABIs
|
|
# if defined(__ARM_ARCH_7K__) && __ARM_ARCH_7K__ >= 2
|
|
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
|
|
# endif
|
|
# else
|
|
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#endif // _LIBCPP___CONFIGURATION_ABI_H
|