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[ORC-RT] Add compiler abstraction header for the ORC runtime. 

This header provides helper macros to insulate the rest of the ORC runtime from
compiler specifics.
This commit is contained in:
Lang Hames 2021-05-17 19:51:42 -07:00
parent c42580bf20
commit bd6c93c004
1 changed files with 55 additions and 0 deletions
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compiler-rt/lib/orc/compiler.h Normal file
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//===--------- compiler.h - Compiler abstraction support --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of the ORC runtime support library.
//
// Most functionality in this file was swiped from llvm/Support/Compiler.h.
//
//===----------------------------------------------------------------------===//
#ifndef ORC_RT_COMPILER_H
#define ORC_RT_COMPILER_H
#define ORC_RT_INTERFACE extern "C" __attribute__((visibility("default")))
#define ORC_RT_HIDDEN __attribute__((visibility("hidden")))
// Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in
// C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.
#ifndef ORC_RT_HAS_CPP_ATTRIBUTE
#if defined(__cplusplus) && defined(__has_cpp_attribute)
#define ORC_RT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
#else
#define ORC_RT_HAS_CPP_ATTRIBUTE(x) 0
#endif
#endif
// Use the 'nodiscard' attribute in C++17 or newer mode.
#if defined(__cplusplus) && __cplusplus > 201402L && \
ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard)
#define ORC_RT_NODISCARD [[nodiscard]]
#elif ORC_RT_HAS_CPP_ATTRIBUTE(clang::warn_unused_result)
#define ORC_RT_NODISCARD [[clang::warn_unused_result]]
// Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also
// warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518).
// Use the 'nodiscard' attribute in C++14 mode only with GCC.
// TODO: remove this workaround when PR33518 is resolved.
#elif defined(__GNUC__) && ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard)
#define ORC_RT_NODISCARD [[nodiscard]]
#else
#define ORC_RT_NODISCARD
#endif
#if __has_builtin(__builtin_expect)
#define ORC_RT_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
#define ORC_RT_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
#else
#define ORC_RT_LIKELY(EXPR) (EXPR)
#define ORC_RT_UNLIKELY(EXPR) (EXPR)
#endif
#endif // ORC_RT_COMPILER_H