mirror of
https://github.com/ziglang/zig.git
synced 2025-02-15 09:00:16 +00:00
06ee65af9e
release/18.x branch, commit 78b99c73ee4b96fe9ce0e294d4632326afb2db42 This adds the flag `-D_LIBCPP_HARDENING_MODE` which is determined based on the Zig optimization mode. This commit also fixes libunwind, libcxx, and libcxxabi to properly report sub compilation errors.
325 lines
18 KiB
C++
Vendored
325 lines
18 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___AVAILABILITY
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#define _LIBCPP___AVAILABILITY
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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// Libc++ is shipped by various vendors. In particular, it is used as a system
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// library on macOS, iOS and other Apple platforms. In order for users to be
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// able to compile a binary that is intended to be deployed to an older version
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// of a platform, Clang provides availability attributes [1]. These attributes
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// can be placed on declarations and are used to describe the life cycle of a
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// symbol in the library.
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//
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// The main goal is to ensure a compile-time error if a symbol that hasn't been
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// introduced in a previously released library is used in a program that targets
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// that previously released library. Normally, this would be a load-time error
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// when one tries to launch the program against the older library.
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//
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// For example, the filesystem library was introduced in the dylib in macOS 10.15.
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// If a user compiles on a macOS 10.15 host but targets macOS 10.13 with their
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// program, the compiler would normally not complain (because the required
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// declarations are in the headers), but the dynamic loader would fail to find
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// the symbols when actually trying to launch the program on macOS 10.13. To
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// turn this into a compile-time issue instead, declarations are annotated with
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// when they were introduced, and the compiler can produce a diagnostic if the
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// program references something that isn't available on the deployment target.
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//
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// This mechanism is general in nature, and any vendor can add their markup to
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// the library (see below). Whenever a new feature is added that requires support
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// in the shared library, two macros are added below to allow marking the feature
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// as unavailable:
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// 1. A macro named `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` which must be defined
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// exactly when compiling for a target that doesn't support the feature.
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// 2. A macro named `_LIBCPP_AVAILABILITY_<feature>`, which must always be defined
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// and must expand to the proper availability attribute for the platform.
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//
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// When vendors decide to ship the feature as part of their shared library, they
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// can update these macros appropriately for their platform, and the library will
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// use those to provide an optimal user experience.
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//
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// Furthermore, many features in the standard library have corresponding
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// feature-test macros. The `_LIBCPP_AVAILABILITY_HAS_NO_<feature>` macros
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// are checked by the corresponding feature-test macros generated by
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// generate_feature_test_macro_components.py to ensure that the library
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// doesn't announce a feature as being implemented if it is unavailable on
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// the deployment target.
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//
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// Note that this mechanism is disabled by default in the "upstream" libc++.
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// Availability annotations are only meaningful when shipping libc++ inside
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// a platform (i.e. as a system library), and so vendors that want them should
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// turn those annotations on at CMake configuration time.
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//
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// [1]: https://clang.llvm.org/docs/AttributeReference.html#availability
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// For backwards compatibility, allow users to define _LIBCPP_DISABLE_AVAILABILITY
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// for a while.
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#if defined(_LIBCPP_DISABLE_AVAILABILITY)
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# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
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# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
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# endif
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#endif
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// Availability markup is disabled when building the library, or when a non-Clang
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// compiler is used because only Clang supports the necessary attributes.
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// doesn't support the proper attributes.
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#if defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCXXABI_BUILDING_LIBRARY) || !defined(_LIBCPP_COMPILER_CLANG_BASED)
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# if !defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
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# define _LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS
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# endif
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#endif
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#if defined(_LIBCPP_HAS_NO_VENDOR_AVAILABILITY_ANNOTATIONS)
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// These macros control the availability of std::bad_optional_access and
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// other exception types. These were put in the shared library to prevent
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// code bloat from every user program defining the vtable for these exception
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// types.
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//
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// Note that when exceptions are disabled, the methods that normally throw
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// these exceptions can be used even on older deployment targets, but those
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// methods will abort instead of throwing.
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# define _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS 1
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# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
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# define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS 1
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# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
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# define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST 1
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# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST
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// These macros controls the availability of __cxa_init_primary_exception
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// in the built library, which std::make_exception_ptr might use
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// (see libcxx/include/__exception/exception_ptr.h).
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# define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION 1
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# define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION
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// These macros control the availability of all parts of <filesystem> that
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// depend on something in the dylib.
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# define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY 1
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# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY
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# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH
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# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP
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// This controls the availability of floating-point std::to_chars functions.
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// These overloads were added later than the integer overloads.
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# define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT 1
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# define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT
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// This controls the availability of the C++20 synchronization library,
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// which requires shared library support for various operations
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// (see libcxx/src/atomic.cpp). This includes <barier>, <latch>,
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// <semaphore>, and notification functions on std::atomic.
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# define _LIBCPP_AVAILABILITY_HAS_SYNC 1
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# define _LIBCPP_AVAILABILITY_SYNC
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// This controls whether the library claims to provide a default verbose
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// termination function, and consequently whether the headers will try
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// to use it when the mechanism isn't overriden at compile-time.
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# define _LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT 1
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# define _LIBCPP_AVAILABILITY_VERBOSE_ABORT
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// This controls the availability of the C++17 std::pmr library,
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// which is implemented in large part in the built library.
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# define _LIBCPP_AVAILABILITY_HAS_PMR 1
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# define _LIBCPP_AVAILABILITY_PMR
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// This controls the availability of the C++20 time zone database.
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// The parser code is built in the library.
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# define _LIBCPP_AVAILABILITY_HAS_TZDB 1
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# define _LIBCPP_AVAILABILITY_TZDB
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// This controls the availability of C++23 <print>, which
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// has a dependency on the built library (it needs access to
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// the underlying buffer types of std::cout, std::cerr, and std::clog.
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# define _LIBCPP_AVAILABILITY_HAS_PRINT 1
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# define _LIBCPP_AVAILABILITY_PRINT
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// Enable additional explicit instantiations of iostreams components. This
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// reduces the number of weak definitions generated in programs that use
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// iostreams by providing a single strong definition in the shared library.
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//
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// TODO: Enable additional explicit instantiations on GCC once it supports exclude_from_explicit_instantiation,
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// or once libc++ doesn't use the attribute anymore.
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// TODO: Enable them on Windows once https://llvm.org/PR41018 has been fixed.
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# if !defined(_LIBCPP_COMPILER_GCC) && !defined(_WIN32)
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# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 1
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# else
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# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 0
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# endif
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#elif defined(__APPLE__)
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# define _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS \
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(!defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) || __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 50000)
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# define _LIBCPP_AVAILABILITY_HAS_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS
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# define _LIBCPP_AVAILABILITY_HAS_BAD_ANY_CAST _LIBCPP_AVAILABILITY_HAS_BAD_OPTIONAL_ACCESS
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# define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS __attribute__((availability(watchos, strict, introduced = 5.0)))
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# define _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
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# define _LIBCPP_AVAILABILITY_BAD_ANY_CAST _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
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// TODO: Update once this is released
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# define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION 0
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# define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION __attribute__((unavailable))
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// <filesystem>
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// clang-format off
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# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101500) || \
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(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 130000) || \
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(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 130000) || \
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(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 60000)
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// clang-format on
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# define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY 0
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# else
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# define _LIBCPP_AVAILABILITY_HAS_FILESYSTEM_LIBRARY 1
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# endif
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# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY \
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__attribute__((availability(macos, strict, introduced = 10.15))) \
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__attribute__((availability(ios, strict, introduced = 13.0))) \
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__attribute__((availability(tvos, strict, introduced = 13.0))) \
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__attribute__((availability(watchos, strict, introduced = 6.0)))
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// clang-format off
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# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_PUSH \
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_Pragma("clang attribute push(__attribute__((availability(macos,strict,introduced=10.15))), apply_to=any(function,record))") \
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_Pragma("clang attribute push(__attribute__((availability(ios,strict,introduced=13.0))), apply_to=any(function,record))") \
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_Pragma("clang attribute push(__attribute__((availability(tvos,strict,introduced=13.0))), apply_to=any(function,record))") \
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_Pragma("clang attribute push(__attribute__((availability(watchos,strict,introduced=6.0))), apply_to=any(function,record))")
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# define _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY_POP \
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_Pragma("clang attribute pop") \
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_Pragma("clang attribute pop") \
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_Pragma("clang attribute pop") \
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_Pragma("clang attribute pop")
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// clang-format on
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// std::to_chars(floating-point)
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// clang-format off
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# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 130300) || \
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(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 160300) || \
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(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 160300) || \
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(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 90300)
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// clang-format on
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# define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT 0
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# else
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# define _LIBCPP_AVAILABILITY_HAS_TO_CHARS_FLOATING_POINT 1
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# endif
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# define _LIBCPP_AVAILABILITY_TO_CHARS_FLOATING_POINT \
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__attribute__((availability(macos, strict, introduced = 13.3))) \
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__attribute__((availability(ios, strict, introduced = 16.3))) \
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__attribute__((availability(tvos, strict, introduced = 16.3))) \
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__attribute__((availability(watchos, strict, introduced = 9.3)))
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// c++20 synchronization library
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// clang-format off
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# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 110000) || \
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(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 140000) || \
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(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 140000) || \
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(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 70000)
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// clang-format on
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# define _LIBCPP_AVAILABILITY_HAS_SYNC 0
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# else
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# define _LIBCPP_AVAILABILITY_HAS_SYNC 1
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# endif
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# define _LIBCPP_AVAILABILITY_SYNC \
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__attribute__((availability(macos, strict, introduced = 11.0))) \
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__attribute__((availability(ios, strict, introduced = 14.0))) \
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__attribute__((availability(tvos, strict, introduced = 14.0))) \
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__attribute__((availability(watchos, strict, introduced = 7.0)))
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// __libcpp_verbose_abort
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// TODO: Update once this is released
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# define _LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT 0
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# define _LIBCPP_AVAILABILITY_VERBOSE_ABORT __attribute__((unavailable))
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// std::pmr
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// clang-format off
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# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 140000) || \
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(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 170000) || \
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(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 170000) || \
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(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 100000)
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// clang-format on
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# define _LIBCPP_AVAILABILITY_HAS_PMR 0
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# else
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# define _LIBCPP_AVAILABILITY_HAS_PMR 1
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# endif
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// TODO: Enable std::pmr markup once https://github.com/llvm/llvm-project/issues/40340 has been fixed
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// Until then, it is possible for folks to try to use `std::pmr` when back-deploying to targets that don't support
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// it and it'll be a load-time error, but we don't have a good alternative because the library won't compile if we
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// use availability annotations until that bug has been fixed.
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# if 0
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# define _LIBCPP_AVAILABILITY_PMR \
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__attribute__((availability(macos, strict, introduced = 14.0))) \
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__attribute__((availability(ios, strict, introduced = 17.0))) \
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__attribute__((availability(tvos, strict, introduced = 17.0))) \
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__attribute__((availability(watchos, strict, introduced = 10.0)))
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# else
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# define _LIBCPP_AVAILABILITY_PMR
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# endif
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# define _LIBCPP_AVAILABILITY_HAS_TZDB 0
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# define _LIBCPP_AVAILABILITY_TZDB __attribute__((unavailable))
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// Warning: This availability macro works differently than the other macros.
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// The dylib part of print is not needed on Apple platforms. Therefore when
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// the macro is not available the code calling the dylib is commented out.
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// The macro _LIBCPP_AVAILABILITY_PRINT is not used.
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# define _LIBCPP_AVAILABILITY_HAS_PRINT 0
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# define _LIBCPP_AVAILABILITY_PRINT __attribute__((unavailable))
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// clang-format off
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# if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 120000) || \
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(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 150000) || \
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(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 150000) || \
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(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 80000)
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// clang-format on
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# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 0
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# else
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# define _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 1
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# endif
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#else
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// ...New vendors can add availability markup here...
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# error \
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"It looks like you're trying to enable vendor availability markup, but you haven't defined the corresponding macros yet!"
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#endif
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// Define availability attributes that depend on _LIBCPP_HAS_NO_EXCEPTIONS.
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// Those are defined in terms of the availability attributes above, and
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// should not be vendor-specific.
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#if defined(_LIBCPP_HAS_NO_EXCEPTIONS)
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# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
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# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
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# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS
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#else
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# define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST _LIBCPP_AVAILABILITY_BAD_ANY_CAST
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# define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
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# define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
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#endif
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// Define availability attributes that depend on both
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// _LIBCPP_HAS_NO_EXCEPTIONS and _LIBCPP_HAS_NO_RTTI.
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#if defined(_LIBCPP_HAS_NO_EXCEPTIONS) || defined(_LIBCPP_HAS_NO_RTTI)
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# undef _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION
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# undef _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION
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# define _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION 0
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# define _LIBCPP_AVAILABILITY_INIT_PRIMARY_EXCEPTION
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#endif
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#endif // _LIBCPP___AVAILABILITY
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