afec0f0ec3
If a C source file includes the libc++ stdatomic.h, compilation will break because (a) the C++ standard check will fail (which is expected), and (b) `_LIBCPP_COMPILER_CLANG_BASED` won't be defined because the logic defining it in `__config` is guarded by a `__cplusplus` check, so we'll end up with a blank header. Move the detection logic outside of the `__cplusplus` check to make the second check pass even in a C context when you're using Clang. Note that `_LIBCPP_STD_VER` is not defined when in C mode, hence stdatomic.h needs to check if in C++ mode before using that macro to avoid a warning. In an ideal world, a C source file wouldn't be including the libc++ header directory in its search path, so we'd never have this issue. Unfortunately, certain build environments make this hard to guarantee, and in this case it's easy to tweak this header to make it work in a C context, so I'm hoping this is acceptable. Fixes https://github.com/llvm/llvm-project/issues/57710. Differential Revision: https://reviews.llvm.org/D134591
236 lines
10 KiB
C++
236 lines
10 KiB
C++
// -*- 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_STDATOMIC_H
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#define _LIBCPP_STDATOMIC_H
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/*
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stdatomic.h synopsis
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template<class T>
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using std-atomic = std::atomic<T>; // exposition only
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#define _Atomic(T) std-atomic<T>
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#define ATOMIC_BOOL_LOCK_FREE see below
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#define ATOMIC_CHAR_LOCK_FREE see below
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#define ATOMIC_CHAR16_T_LOCK_FREE see below
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#define ATOMIC_CHAR32_T_LOCK_FREE see below
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#define ATOMIC_WCHAR_T_LOCK_FREE see below
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#define ATOMIC_SHORT_LOCK_FREE see below
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#define ATOMIC_INT_LOCK_FREE see below
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#define ATOMIC_LONG_LOCK_FREE see below
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#define ATOMIC_LLONG_LOCK_FREE see below
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#define ATOMIC_POINTER_LOCK_FREE see below
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using std::memory_order // see below
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using std::memory_order_relaxed // see below
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using std::memory_order_consume // see below
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using std::memory_order_acquire // see below
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using std::memory_order_release // see below
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using std::memory_order_acq_rel // see below
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using std::memory_order_seq_cst // see below
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using std::atomic_flag // see below
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using std::atomic_bool // see below
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using std::atomic_char // see below
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using std::atomic_schar // see below
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using std::atomic_uchar // see below
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using std::atomic_short // see below
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using std::atomic_ushort // see below
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using std::atomic_int // see below
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using std::atomic_uint // see below
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using std::atomic_long // see below
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using std::atomic_ulong // see below
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using std::atomic_llong // see below
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using std::atomic_ullong // see below
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using std::atomic_char8_t // see below
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using std::atomic_char16_t // see below
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using std::atomic_char32_t // see below
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using std::atomic_wchar_t // see below
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using std::atomic_int8_t // see below
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using std::atomic_uint8_t // see below
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using std::atomic_int16_t // see below
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using std::atomic_uint16_t // see below
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using std::atomic_int32_t // see below
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using std::atomic_uint32_t // see below
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using std::atomic_int64_t // see below
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using std::atomic_uint64_t // see below
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using std::atomic_int_least8_t // see below
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using std::atomic_uint_least8_t // see below
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using std::atomic_int_least16_t // see below
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using std::atomic_uint_least16_t // see below
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using std::atomic_int_least32_t // see below
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using std::atomic_uint_least32_t // see below
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using std::atomic_int_least64_t // see below
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using std::atomic_uint_least64_t // see below
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using std::atomic_int_fast8_t // see below
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using std::atomic_uint_fast8_t // see below
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using std::atomic_int_fast16_t // see below
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using std::atomic_uint_fast16_t // see below
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using std::atomic_int_fast32_t // see below
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using std::atomic_uint_fast32_t // see below
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using std::atomic_int_fast64_t // see below
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using std::atomic_uint_fast64_t // see below
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using std::atomic_intptr_t // see below
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using std::atomic_uintptr_t // see below
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using std::atomic_size_t // see below
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using std::atomic_ptrdiff_t // see below
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using std::atomic_intmax_t // see below
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using std::atomic_uintmax_t // see below
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using std::atomic_is_lock_free // see below
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using std::atomic_load // see below
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using std::atomic_load_explicit // see below
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using std::atomic_store // see below
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using std::atomic_store_explicit // see below
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using std::atomic_exchange // see below
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using std::atomic_exchange_explicit // see below
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using std::atomic_compare_exchange_strong // see below
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using std::atomic_compare_exchange_strong_explicit // see below
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using std::atomic_compare_exchange_weak // see below
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using std::atomic_compare_exchange_weak_explicit // see below
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using std::atomic_fetch_add // see below
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using std::atomic_fetch_add_explicit // see below
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using std::atomic_fetch_sub // see below
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using std::atomic_fetch_sub_explicit // see below
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using std::atomic_fetch_or // see below
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using std::atomic_fetch_or_explicit // see below
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using std::atomic_fetch_and // see below
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using std::atomic_fetch_and_explicit // see below
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using std::atomic_flag_test_and_set // see below
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using std::atomic_flag_test_and_set_explicit // see below
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using std::atomic_flag_clear // see below
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using std::atomic_flag_clear_explicit // see below
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using std::atomic_thread_fence // see below
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using std::atomic_signal_fence // see below
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*/
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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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#if defined(__cplusplus) && _LIBCPP_STD_VER > 20
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#include <atomic>
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#include <version>
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#ifdef _Atomic
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# undef _Atomic
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#endif
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#define _Atomic(_Tp) ::std::atomic<_Tp>
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using std::memory_order _LIBCPP_USING_IF_EXISTS;
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using std::memory_order_relaxed _LIBCPP_USING_IF_EXISTS;
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using std::memory_order_consume _LIBCPP_USING_IF_EXISTS;
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using std::memory_order_acquire _LIBCPP_USING_IF_EXISTS;
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using std::memory_order_release _LIBCPP_USING_IF_EXISTS;
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using std::memory_order_acq_rel _LIBCPP_USING_IF_EXISTS;
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using std::memory_order_seq_cst _LIBCPP_USING_IF_EXISTS;
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using std::atomic_flag _LIBCPP_USING_IF_EXISTS;
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using std::atomic_bool _LIBCPP_USING_IF_EXISTS;
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using std::atomic_char _LIBCPP_USING_IF_EXISTS;
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using std::atomic_schar _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uchar _LIBCPP_USING_IF_EXISTS;
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using std::atomic_short _LIBCPP_USING_IF_EXISTS;
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using std::atomic_ushort _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint _LIBCPP_USING_IF_EXISTS;
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using std::atomic_long _LIBCPP_USING_IF_EXISTS;
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using std::atomic_ulong _LIBCPP_USING_IF_EXISTS;
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using std::atomic_llong _LIBCPP_USING_IF_EXISTS;
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using std::atomic_ullong _LIBCPP_USING_IF_EXISTS;
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using std::atomic_char8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_char16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_char32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_wchar_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int64_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint64_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_least8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_least8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_least16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_least16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_least32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_least32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_least64_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_least64_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_fast8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_fast8_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_fast16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_fast16_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_fast32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_fast32_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_int_fast64_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uint_fast64_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_intptr_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uintptr_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_size_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_ptrdiff_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_intmax_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_uintmax_t _LIBCPP_USING_IF_EXISTS;
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using std::atomic_compare_exchange_strong _LIBCPP_USING_IF_EXISTS;
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using std::atomic_compare_exchange_strong_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_compare_exchange_weak _LIBCPP_USING_IF_EXISTS;
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using std::atomic_compare_exchange_weak_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_exchange _LIBCPP_USING_IF_EXISTS;
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using std::atomic_exchange_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_add _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_add_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_and _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_and_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_or _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_or_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_sub _LIBCPP_USING_IF_EXISTS;
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using std::atomic_fetch_sub_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_flag_clear _LIBCPP_USING_IF_EXISTS;
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using std::atomic_flag_clear_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_flag_test_and_set _LIBCPP_USING_IF_EXISTS;
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using std::atomic_flag_test_and_set_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_is_lock_free _LIBCPP_USING_IF_EXISTS;
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using std::atomic_load _LIBCPP_USING_IF_EXISTS;
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using std::atomic_load_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_store _LIBCPP_USING_IF_EXISTS;
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using std::atomic_store_explicit _LIBCPP_USING_IF_EXISTS;
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using std::atomic_signal_fence _LIBCPP_USING_IF_EXISTS;
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using std::atomic_thread_fence _LIBCPP_USING_IF_EXISTS;
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#elif defined(_LIBCPP_COMPILER_CLANG_BASED)
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// Before C++23, we include the next <stdatomic.h> on the path to avoid hijacking
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// the header. We do this because Clang has historically shipped a <stdatomic.h>
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// header that would be available in all Standard modes, and we don't want to
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// break that use case.
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# if __has_include_next(<stdatomic.h>)
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# include_next <stdatomic.h>
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# endif
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#endif // defined(__cplusplus) && _LIBCPP_STD_VER > 20
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#endif // _LIBCPP_STDATOMIC_H
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