b285745dc1
This patch moves all macros which expand to attributes into a detail header, including the relatively complex visibility and ABI-hiding attributes. This also adds sections for attributes that are important to not be ignored. At the bottom there is a catch-all section for attributes which can safely be ignored and are only important for the quality of implementation.
461 lines
18 KiB
C++
461 lines
18 KiB
C++
//===----------------------------------------------------------------------===//
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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_ATTRIBUTES_H
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#define _LIBCPP___CONFIGURATION_ATTRIBUTES_H
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#include <__config_site>
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#include <__configuration/hardening.h>
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#include <__configuration/language.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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#ifndef __has_declspec_attribute
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# define __has_declspec_attribute(__x) 0
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#endif
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// Attributes relevant for layout ABI
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// ----------------------------------
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#if __has_cpp_attribute(msvc::no_unique_address)
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// MSVC implements [[no_unique_address]] as a silent no-op currently.
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// (If/when MSVC breaks its C++ ABI, it will be changed to work as intended.)
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// However, MSVC implements [[msvc::no_unique_address]] which does what
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// [[no_unique_address]] is supposed to do, in general.
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# define _LIBCPP_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
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#else
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# define _LIBCPP_NO_UNIQUE_ADDRESS [[__no_unique_address__]]
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#endif
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#define _LIBCPP_PACKED __attribute__((__packed__))
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// Attributes affecting overload resolution
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// ----------------------------------------
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#if __has_attribute(__enable_if__)
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# define _LIBCPP_PREFERRED_OVERLOAD __attribute__((__enable_if__(true, "")))
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#endif
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// Visibility attributes
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// ---------------------
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#if defined(_LIBCPP_OBJECT_FORMAT_COFF)
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# ifdef _DLL
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# define _LIBCPP_CRT_FUNC __declspec(dllimport)
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# else
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# define _LIBCPP_CRT_FUNC
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# endif
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# if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) || (defined(__MINGW32__) && !defined(_LIBCPP_BUILDING_LIBRARY))
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# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
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# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
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# define _LIBCPP_OVERRIDABLE_FUNC_VIS
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# define _LIBCPP_EXPORTED_FROM_ABI
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# elif defined(_LIBCPP_BUILDING_LIBRARY)
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# if defined(__MINGW32__)
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# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS __declspec(dllexport)
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# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
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# else
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# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
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# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __declspec(dllexport)
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# endif
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# define _LIBCPP_OVERRIDABLE_FUNC_VIS __declspec(dllexport)
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# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport)
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# else
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# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS __declspec(dllimport)
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# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
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# define _LIBCPP_OVERRIDABLE_FUNC_VIS
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# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport)
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# endif
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# define _LIBCPP_HIDDEN
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# define _LIBCPP_TEMPLATE_DATA_VIS
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# define _LIBCPP_NAMESPACE_VISIBILITY
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#else
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# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
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# define _LIBCPP_VISIBILITY(vis) __attribute__((__visibility__(vis)))
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# else
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# define _LIBCPP_VISIBILITY(vis)
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# endif
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# define _LIBCPP_HIDDEN _LIBCPP_VISIBILITY("hidden")
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# define _LIBCPP_TEMPLATE_DATA_VIS _LIBCPP_VISIBILITY("default")
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# define _LIBCPP_EXPORTED_FROM_ABI _LIBCPP_VISIBILITY("default")
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# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_VISIBILITY("default")
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# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
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// TODO: Make this a proper customization point or remove the option to override it.
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# ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS
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# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_VISIBILITY("default")
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# endif
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# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
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# define _LIBCPP_NAMESPACE_VISIBILITY __attribute__((__type_visibility__("default")))
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# elif !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
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# define _LIBCPP_NAMESPACE_VISIBILITY __attribute__((__visibility__("default")))
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# else
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# define _LIBCPP_NAMESPACE_VISIBILITY
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# endif
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#endif // defined(_LIBCPP_OBJECT_FORMAT_COFF)
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// hide_from_abi
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// -------------
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#define _LIBCPP_ALWAYS_INLINE __attribute__((__always_inline__))
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#if __has_attribute(exclude_from_explicit_instantiation)
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# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__((__exclude_from_explicit_instantiation__))
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#else
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// Try to approximate the effect of exclude_from_explicit_instantiation
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// (which is that entities are not assumed to be provided by explicit
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// template instantiations in the dylib) by always inlining those entities.
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# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE
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#endif
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#if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_FAST
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# define _LIBCPP_HARDENING_SIG f
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#elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_EXTENSIVE
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# define _LIBCPP_HARDENING_SIG s
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#elif _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG
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# define _LIBCPP_HARDENING_SIG d
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#else
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# define _LIBCPP_HARDENING_SIG n // "none"
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#endif
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#if _LIBCPP_ASSERTION_SEMANTIC == _LIBCPP_ASSERTION_SEMANTIC_OBSERVE
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# define _LIBCPP_ASSERTION_SEMANTIC_SIG o
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#elif _LIBCPP_ASSERTION_SEMANTIC == _LIBCPP_ASSERTION_SEMANTIC_QUICK_ENFORCE
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# define _LIBCPP_ASSERTION_SEMANTIC_SIG q
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#elif _LIBCPP_ASSERTION_SEMANTIC == _LIBCPP_ASSERTION_SEMANTIC_ENFORCE
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# define _LIBCPP_ASSERTION_SEMANTIC_SIG e
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#else
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# define _LIBCPP_ASSERTION_SEMANTIC_SIG i // `ignore`
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#endif
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#if !_LIBCPP_HAS_EXCEPTIONS
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# define _LIBCPP_EXCEPTIONS_SIG n
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#else
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# define _LIBCPP_EXCEPTIONS_SIG e
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#endif
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#define _LIBCPP_ODR_SIGNATURE \
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_LIBCPP_CONCAT( \
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_LIBCPP_CONCAT(_LIBCPP_CONCAT(_LIBCPP_HARDENING_SIG, _LIBCPP_ASSERTION_SEMANTIC_SIG), _LIBCPP_EXCEPTIONS_SIG), \
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_LIBCPP_VERSION)
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// This macro marks a symbol as being hidden from libc++'s ABI. This is achieved
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// on two levels:
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// 1. The symbol is given hidden visibility, which ensures that users won't start exporting
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// symbols from their dynamic library by means of using the libc++ headers. This ensures
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// that those symbols stay private to the dynamic library in which it is defined.
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//
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// 2. The symbol is given an ABI tag that encodes the ODR-relevant properties of the library.
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// This ensures that no ODR violation can arise from mixing two TUs compiled with different
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// versions or configurations of libc++ (such as exceptions vs no-exceptions). Indeed, if the
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// program contains two definitions of a function, the ODR requires them to be token-by-token
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// equivalent, and the linker is allowed to pick either definition and discard the other one.
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//
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// For example, if a program contains a copy of `vector::at()` compiled with exceptions enabled
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// *and* a copy of `vector::at()` compiled with exceptions disabled (by means of having two TUs
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// compiled with different settings), the two definitions are both visible by the linker and they
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// have the same name, but they have a meaningfully different implementation (one throws an exception
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// and the other aborts the program). This violates the ODR and makes the program ill-formed, and in
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// practice what will happen is that the linker will pick one of the definitions at random and will
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// discard the other one. This can quite clearly lead to incorrect program behavior.
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//
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// A similar reasoning holds for many other properties that are ODR-affecting. Essentially any
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// property that causes the code of a function to differ from the code in another configuration
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// can be considered ODR-affecting. In practice, we don't encode all such properties in the ABI
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// tag, but we encode the ones that we think are most important: library version, exceptions, and
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// hardening mode.
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//
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// Note that historically, solving this problem has been achieved in various ways, including
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// force-inlining all functions or giving internal linkage to all functions. Both these previous
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// solutions suffer from drawbacks that lead notably to code bloat.
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//
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// Note that we use _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION to ensure that we don't depend
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// on _LIBCPP_HIDE_FROM_ABI methods of classes explicitly instantiated in the dynamic library.
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//
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// Also note that the _LIBCPP_HIDE_FROM_ABI_VIRTUAL macro should be used on virtual functions
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// instead of _LIBCPP_HIDE_FROM_ABI. That macro does not use an ABI tag. Indeed, the mangled
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// name of a virtual function is part of its ABI, since some architectures like arm64e can sign
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// the virtual function pointer in the vtable based on the mangled name of the function. Since
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// we use an ABI tag that changes with each released version, the mangled name of the virtual
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// function would change, which is incorrect. Note that it doesn't make much sense to change
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// the implementation of a virtual function in an ABI-incompatible way in the first place,
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// since that would be an ABI break anyway. Hence, the lack of ABI tag should not be noticeable.
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//
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// The macro can be applied to record and enum types. When the tagged type is nested in
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// a record this "parent" record needs to have the macro too. Another use case for applying
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// this macro to records and unions is to apply an ABI tag to inline constexpr variables.
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// This can be useful for inline variables that are implementation details which are expected
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// to change in the future.
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//
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// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing
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// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and
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// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70.
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#ifndef _LIBCPP_NO_ABI_TAG
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# define _LIBCPP_HIDE_FROM_ABI \
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_LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \
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__attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_ODR_SIGNATURE))))
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#else
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# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
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#endif
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#define _LIBCPP_HIDE_FROM_ABI_VIRTUAL _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
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// Optional attributes
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// -------------------
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// these are useful for a better QoI, but not required to be available
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#define _LIBCPP_NOALIAS __attribute__((__malloc__))
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#define _LIBCPP_NODEBUG [[__gnu__::__nodebug__]]
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#define _LIBCPP_NO_SANITIZE(...) __attribute__((__no_sanitize__(__VA_ARGS__)))
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#define _LIBCPP_INIT_PRIORITY_MAX __attribute__((__init_priority__(100)))
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#define _LIBCPP_ATTRIBUTE_FORMAT(archetype, format_string_index, first_format_arg_index) \
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__attribute__((__format__(archetype, format_string_index, first_format_arg_index)))
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#if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
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# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))
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#else
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# define _LIBCPP_NO_CFI
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#endif
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#if __has_attribute(__using_if_exists__)
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# define _LIBCPP_USING_IF_EXISTS __attribute__((__using_if_exists__))
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#else
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# define _LIBCPP_USING_IF_EXISTS
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#endif
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#if __has_cpp_attribute(_Clang::__no_destroy__)
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# define _LIBCPP_NO_DESTROY [[_Clang::__no_destroy__]]
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#else
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# define _LIBCPP_NO_DESTROY
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#endif
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#if __has_attribute(__diagnose_if__)
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# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning")))
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#else
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# define _LIBCPP_DIAGNOSE_WARNING(...)
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#endif
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#if __has_attribute(__diagnose_if__) && !defined(_LIBCPP_APPLE_CLANG_VER) && \
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(!defined(_LIBCPP_CLANG_VER) || _LIBCPP_CLANG_VER >= 2001)
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# define _LIBCPP_DIAGNOSE_IF(...) __attribute__((__diagnose_if__(__VA_ARGS__)))
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#else
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# define _LIBCPP_DIAGNOSE_IF(...)
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#endif
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#define _LIBCPP_DIAGNOSE_NULLPTR_IF(condition, condition_description) \
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_LIBCPP_DIAGNOSE_IF( \
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condition, \
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"null passed to callee that requires a non-null argument" condition_description, \
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"warning", \
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"nonnull")
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#if __has_cpp_attribute(_Clang::__lifetimebound__)
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# define _LIBCPP_LIFETIMEBOUND [[_Clang::__lifetimebound__]]
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#else
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# define _LIBCPP_LIFETIMEBOUND
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#endif
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// This is to work around https://llvm.org/PR156809
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#ifndef _LIBCPP_CXX03_LANG
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# define _LIBCPP_CTOR_LIFETIMEBOUND _LIBCPP_LIFETIMEBOUND
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#else
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# define _LIBCPP_CTOR_LIFETIMEBOUND
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#endif
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#if __has_cpp_attribute(_Clang::__noescape__)
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# define _LIBCPP_NOESCAPE [[_Clang::__noescape__]]
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#else
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# define _LIBCPP_NOESCAPE
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#endif
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#if __has_cpp_attribute(_Clang::__no_specializations__)
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# define _LIBCPP_NO_SPECIALIZATIONS \
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[[_Clang::__no_specializations__("Users are not allowed to specialize this standard library entity")]]
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#else
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# define _LIBCPP_NO_SPECIALIZATIONS
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#endif
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#if __has_cpp_attribute(_Clang::__preferred_name__)
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# define _LIBCPP_PREFERRED_NAME(x) [[_Clang::__preferred_name__(x)]]
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#else
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# define _LIBCPP_PREFERRED_NAME(x)
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#endif
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#if __has_cpp_attribute(_Clang::__scoped_lockable__)
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# define _LIBCPP_SCOPED_LOCKABLE [[_Clang::__scoped_lockable__]]
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#else
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# define _LIBCPP_SCOPED_LOCKABLE
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#endif
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#if __has_cpp_attribute(_Clang::__capability__)
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# define _LIBCPP_CAPABILITY(...) [[_Clang::__capability__(__VA_ARGS__)]]
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#else
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# define _LIBCPP_CAPABILITY(...)
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#endif
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#if __has_attribute(__acquire_capability__)
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# define _LIBCPP_ACQUIRE_CAPABILITY(...) __attribute__((__acquire_capability__(__VA_ARGS__)))
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#else
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# define _LIBCPP_ACQUIRE_CAPABILITY(...)
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#endif
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#if __has_cpp_attribute(_Clang::__try_acquire_capability__)
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# define _LIBCPP_TRY_ACQUIRE_CAPABILITY(...) [[_Clang::__try_acquire_capability__(__VA_ARGS__)]]
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#else
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# define _LIBCPP_TRY_ACQUIRE_CAPABILITY(...)
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#endif
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#if __has_cpp_attribute(_Clang::__acquire_shared_capability__)
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# define _LIBCPP_ACQUIRE_SHARED_CAPABILITY [[_Clang::__acquire_shared_capability__]]
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#else
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# define _LIBCPP_ACQUIRE_SHARED_CAPABILITY
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#endif
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#if __has_cpp_attribute(_Clang::__try_acquire_shared_capability__)
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# define _LIBCPP_TRY_ACQUIRE_SHARED_CAPABILITY(...) [[_Clang::__try_acquire_shared_capability__(__VA_ARGS__)]]
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#else
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# define _LIBCPP_TRY_ACQUIRE_SHARED_CAPABILITY(...)
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#endif
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#if __has_cpp_attribute(_Clang::__release_capability__)
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# define _LIBCPP_RELEASE_CAPABILITY [[_Clang::__release_capability__]]
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#else
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# define _LIBCPP_RELEASE_CAPABILITY
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#endif
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#if __has_cpp_attribute(_Clang::__release_shared_capability__)
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# define _LIBCPP_RELEASE_SHARED_CAPABILITY [[_Clang::__release_shared_capability__]]
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#else
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# define _LIBCPP_RELEASE_SHARED_CAPABILITY
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#endif
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#if __has_attribute(__requires_capability__)
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# define _LIBCPP_REQUIRES_CAPABILITY(...) __attribute__((__requires_capability__(__VA_ARGS__)))
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#else
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# define _LIBCPP_REQUIRES_CAPABILITY(...)
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#endif
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#if __has_cpp_attribute(_Clang::__no_thread_safety_analysis__)
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# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS [[_Clang::__no_thread_safety_analysis__]]
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#else
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# define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
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#endif
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#if defined(_LIBCPP_ABI_MICROSOFT) && __has_declspec_attribute(empty_bases)
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# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases)
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#else
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# define _LIBCPP_DECLSPEC_EMPTY_BASES
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#endif
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// Allow for build-time disabling of unsigned integer sanitization
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#if __has_attribute(no_sanitize) && !defined(_LIBCPP_COMPILER_GCC)
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# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
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#else
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# define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
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#endif
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#if __has_feature(nullability)
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# define _LIBCPP_DIAGNOSE_NULLPTR _Nonnull
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#else
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# define _LIBCPP_DIAGNOSE_NULLPTR
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#endif
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#if defined(__CUDACC__) || defined(__CUDA_ARCH__) || defined(__CUDA_LIBDEVICE__)
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// The CUDA SDK contains an unfortunate definition for the __noinline__ macro,
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// which breaks the regular __attribute__((__noinline__)) syntax. Therefore,
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// when compiling for CUDA we use the non-underscored version of the noinline
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// attribute.
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//
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// This is a temporary workaround and we still expect the CUDA SDK team to solve
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// this issue properly in the SDK headers.
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//
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// See https://github.com/llvm/llvm-project/pull/73838 for more details.
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# define _LIBCPP_NOINLINE __attribute__((noinline))
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#elif __has_attribute(__noinline__)
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# define _LIBCPP_NOINLINE __attribute__((__noinline__))
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#else
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# define _LIBCPP_NOINLINE
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#endif
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// Deprecation macros
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// ------------------
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// Deprecations warnings are always enabled, except when users explicitly opt-out
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// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.
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#if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
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# if __has_attribute(__deprecated__)
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# define _LIBCPP_DEPRECATED __attribute__((__deprecated__))
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# define _LIBCPP_DEPRECATED_(m) __attribute__((__deprecated__(m)))
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# elif _LIBCPP_STD_VER >= 14
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# define _LIBCPP_DEPRECATED [[deprecated]]
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# define _LIBCPP_DEPRECATED_(m) [[deprecated(m)]]
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# else
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# define _LIBCPP_DEPRECATED
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# define _LIBCPP_DEPRECATED_(m)
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# endif
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#else
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# define _LIBCPP_DEPRECATED
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# define _LIBCPP_DEPRECATED_(m)
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#endif
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#if !defined(_LIBCPP_CXX03_LANG)
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# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
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#else
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# define _LIBCPP_DEPRECATED_IN_CXX11
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#endif
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#if _LIBCPP_STD_VER >= 14
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# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED
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#else
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# define _LIBCPP_DEPRECATED_IN_CXX14
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#endif
|
|
|
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#if _LIBCPP_STD_VER >= 17
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# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
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|
#else
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# define _LIBCPP_DEPRECATED_IN_CXX17
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#endif
|
|
|
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#if _LIBCPP_STD_VER >= 20
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|
# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED
|
|
#else
|
|
# define _LIBCPP_DEPRECATED_IN_CXX20
|
|
#endif
|
|
|
|
#if _LIBCPP_STD_VER >= 23
|
|
# define _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_DEPRECATED
|
|
#else
|
|
# define _LIBCPP_DEPRECATED_IN_CXX23
|
|
#endif
|
|
|
|
#if _LIBCPP_STD_VER >= 26
|
|
# define _LIBCPP_DEPRECATED_IN_CXX26 _LIBCPP_DEPRECATED
|
|
# define _LIBCPP_DEPRECATED_IN_CXX26_(m) _LIBCPP_DEPRECATED_(m)
|
|
#else
|
|
# define _LIBCPP_DEPRECATED_IN_CXX26
|
|
# define _LIBCPP_DEPRECATED_IN_CXX26_(m)
|
|
#endif
|
|
|
|
#if _LIBCPP_HAS_CHAR8_T
|
|
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED
|
|
#else
|
|
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T
|
|
#endif
|
|
|
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#endif // _LIBCPP___CONFIGURATION_ATTRIBUTES_H
|