mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-04-26 13:01:34 +03:00
Alex Rønne Petersen
143 lines
6.2 KiB
C++
Vendored
143 lines
6.2 KiB
C++
Vendored
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CONFIGURATION_ABI_H
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#define _LIBCPP___CONFIGURATION_ABI_H
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/* zig patch: instead of including __config_site, zig adds -D flags when compiling */
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#include <__configuration/compiler.h>
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#include <__configuration/platform.h>
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#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
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# pragma GCC system_header
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#endif
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// FIXME: ABI detection should be done via compiler builtin macros. This
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// is just a placeholder until Clang implements such macros. For now assume
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// that Windows compilers pretending to be MSVC++ target the Microsoft ABI,
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// and allow the user to explicitly specify the ABI to handle cases where this
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// heuristic falls short.
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#if _LIBCPP_ABI_FORCE_ITANIUM && _LIBCPP_ABI_FORCE_MICROSOFT
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# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be true"
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#elif _LIBCPP_ABI_FORCE_ITANIUM
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# define _LIBCPP_ABI_ITANIUM
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#elif _LIBCPP_ABI_FORCE_MICROSOFT
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# define _LIBCPP_ABI_MICROSOFT
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#else
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// Windows uses the Microsoft ABI
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# if defined(_WIN32) && defined(_MSC_VER)
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# define _LIBCPP_ABI_MICROSOFT
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// 32-bit ARM uses the Itanium ABI with a few differences (array cookies, etc),
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// and so does 64-bit ARM on Apple platforms.
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# elif defined(__arm__) || (defined(__APPLE__) && defined(__aarch64__))
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# define _LIBCPP_ABI_ITANIUM_WITH_ARM_DIFFERENCES
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// Non-Apple 64-bit ARM uses the vanilla Itanium ABI
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# elif defined(__aarch64__)
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# define _LIBCPP_ABI_ITANIUM
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// We assume that other architectures also use the vanilla Itanium ABI too
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# else
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# define _LIBCPP_ABI_ITANIUM
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# endif
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#endif
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#if _LIBCPP_ABI_VERSION >= 2
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// TODO: Move the description of the remaining ABI flags to ABIGuarantees.rst or remove them.
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// Override the default return value of exception::what() for bad_function_call::what()
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// with a string that is specific to bad_function_call (see http://wg21.link/LWG2233).
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// This is an ABI break on platforms that sign and authenticate vtable function pointers
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// because it changes the mangling of the virtual function located in the vtable, which
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// changes how it gets signed.
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# define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
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// According to the Standard, `bitset::operator[] const` returns bool
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# define _LIBCPP_ABI_BITSET_VECTOR_BOOL_CONST_SUBSCRIPT_RETURN_BOOL
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// These flags are documented in ABIGuarantees.rst
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# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
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# define _LIBCPP_ABI_ATOMIC_WAIT_NATIVE_BY_SIZE
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# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
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# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
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# define _LIBCPP_ABI_FIX_CITYHASH_IMPLEMENTATION
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# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE
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# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE
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# define _LIBCPP_ABI_IOS_ALLOW_ARBITRARY_FILL_VALUE
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# define _LIBCPP_ABI_NO_COMPRESSED_PAIR_PADDING
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# define _LIBCPP_ABI_NO_FILESYSTEM_INLINE_NAMESPACE
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# define _LIBCPP_ABI_NO_ITERATOR_BASES
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# define _LIBCPP_ABI_NO_RANDOM_DEVICE_COMPATIBILITY_LAYOUT
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# define _LIBCPP_ABI_NO_REVERSE_ITERATOR_SECOND_MEMBER
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# define _LIBCPP_ABI_OPTIMIZED_FUNCTION
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# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO
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# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
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# define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_ARRAY
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# define _LIBCPP_ABI_USE_WRAP_ITER_IN_STD_STRING_VIEW
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# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION
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# define _LIBCPP_ABI_TRIVIALLY_COPYABLE_BIT_ITERATOR
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#elif _LIBCPP_ABI_VERSION == 1
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// Feature macros for disabling pre ABI v1 features. All of these options
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// are deprecated.
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# if defined(__FreeBSD__)
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# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR
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# endif
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#endif
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// TODO(LLVM 22): Remove this check
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#if defined(_LIBCPP_ABI_NO_ITERATOR_BASES) && !defined(_LIBCPP_ABI_NO_REVERSE_ITERATOR_SECOND_MEMBER)
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# ifndef _LIBCPP_ONLY_NO_ITERATOR_BASES
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# error "You probably want to define _LIBCPP_ABI_NO_REVERSE_ITERATOR_SECOND_MEMBER. This has been split out from" \
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" _LIBCPP_ABI_NO_ITERATOR_BASES to allow only removing the second iterator member, since they aren't really related." \
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"If you actually want this ABI configuration, please define _LIBCPP_ONLY_NO_ITERATOR_BASES instead."
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# endif
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#endif
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// We had some bugs where we use [[no_unique_address]] together with construct_at,
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// which causes UB as the call on construct_at could write to overlapping subobjects
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//
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// https://llvm.org/PR70506
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// https://llvm.org/PR70494
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//
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// To fix the bug we had to change the ABI of some classes to remove [[no_unique_address]] under certain conditions.
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// The macro below is used for all classes whose ABI have changed as part of fixing these bugs.
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#define _LIBCPP_ABI_LLVM18_NO_UNIQUE_ADDRESS __attribute__((__abi_tag__("llvm18_nua")))
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// [[msvc::no_unique_address]] seems to mostly affect empty classes, so the padding scheme for Itanium doesn't work.
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#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_ABI_NO_COMPRESSED_PAIR_PADDING)
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# define _LIBCPP_ABI_NO_COMPRESSED_PAIR_PADDING
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#endif
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// Tracks the bounds of the array owned by std::unique_ptr<T[]>, allowing it to trap when accessed out-of-bounds.
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// Note that limited bounds checking is also available outside of this ABI configuration, but only some categories
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// of types can be checked.
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//
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// ABI impact: This causes the layout of std::unique_ptr<T[]> to change and its size to increase.
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// This also affects the representation of a few library types that use std::unique_ptr
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// internally, such as the unordered containers.
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// #define _LIBCPP_ABI_BOUNDED_UNIQUE_PTR
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#if defined(_LIBCPP_COMPILER_CLANG_BASED)
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# if defined(__APPLE__)
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# if defined(__i386__) || defined(__x86_64__)
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// use old string layout on x86_64 and i386
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# elif defined(__arm__)
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// use old string layout on arm (which does not include aarch64/arm64), except on watch ABIs
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# if defined(__ARM_ARCH_7K__) && __ARM_ARCH_7K__ >= 2
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# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
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# endif
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# else
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# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
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# endif
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# endif
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#endif
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#endif // _LIBCPP___CONFIGURATION_ABI_H
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