forked from OSchip/llvm-project
66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
//===--------- compiler.h - Compiler abstraction support --------*- 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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//
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// This file is a part of the ORC runtime support library.
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//
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// Most functionality in this file was swiped from llvm/Support/Compiler.h.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ORC_RT_COMPILER_H
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#define ORC_RT_COMPILER_H
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#define ORC_RT_INTERFACE extern "C" __attribute__((visibility("default")))
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#define ORC_RT_HIDDEN __attribute__((visibility("hidden")))
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#ifndef __has_builtin
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# define __has_builtin(x) 0
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#endif
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// Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in
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// C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.
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#ifndef ORC_RT_HAS_CPP_ATTRIBUTE
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#if defined(__cplusplus) && defined(__has_cpp_attribute)
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#define ORC_RT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
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#else
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#define ORC_RT_HAS_CPP_ATTRIBUTE(x) 0
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#endif
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#endif
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// Use the 'nodiscard' attribute in C++17 or newer mode.
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#if defined(__cplusplus) && __cplusplus > 201402L && \
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ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard)
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#define ORC_RT_NODISCARD [[nodiscard]]
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#elif ORC_RT_HAS_CPP_ATTRIBUTE(clang::warn_unused_result)
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#define ORC_RT_NODISCARD [[clang::warn_unused_result]]
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// Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also
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// warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518).
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// Use the 'nodiscard' attribute in C++14 mode only with GCC.
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// TODO: remove this workaround when PR33518 is resolved.
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#elif defined(__GNUC__) && ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard)
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#define ORC_RT_NODISCARD [[nodiscard]]
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#else
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#define ORC_RT_NODISCARD
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#endif
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#if __has_builtin(__builtin_expect)
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#define ORC_RT_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
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#define ORC_RT_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
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#else
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#define ORC_RT_LIKELY(EXPR) (EXPR)
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#define ORC_RT_UNLIKELY(EXPR) (EXPR)
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#endif
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#ifdef __APPLE__
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#define ORC_RT_WEAK_IMPORT __attribute__((weak_import))
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#else
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#define ORC_RT_WEAK_IMPORT __attribute__((weak))
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#endif
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#endif // ORC_RT_COMPILER_H
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