1d89ec533Spatrick //===--------- compiler.h - Compiler abstraction support --------*- C++ -*-===// 2d89ec533Spatrick // 3d89ec533Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4d89ec533Spatrick // See https://llvm.org/LICENSE.txt for license information. 5d89ec533Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6d89ec533Spatrick // 7d89ec533Spatrick //===----------------------------------------------------------------------===// 8d89ec533Spatrick // 9d89ec533Spatrick // This file is a part of the ORC runtime support library. 10d89ec533Spatrick // 11d89ec533Spatrick // Most functionality in this file was swiped from llvm/Support/Compiler.h. 12d89ec533Spatrick // 13d89ec533Spatrick //===----------------------------------------------------------------------===// 14d89ec533Spatrick 15d89ec533Spatrick #ifndef ORC_RT_COMPILER_H 16d89ec533Spatrick #define ORC_RT_COMPILER_H 17d89ec533Spatrick 18*810390e3Srobert #if defined(_WIN32) 19*810390e3Srobert #define ORC_RT_INTERFACE extern "C" 20*810390e3Srobert #define ORC_RT_HIDDEN 21*810390e3Srobert #define ORC_RT_IMPORT extern "C" __declspec(dllimport) 22*810390e3Srobert #else 23d89ec533Spatrick #define ORC_RT_INTERFACE extern "C" __attribute__((visibility("default"))) 24d89ec533Spatrick #define ORC_RT_HIDDEN __attribute__((visibility("hidden"))) 25*810390e3Srobert #define ORC_RT_IMPORT extern "C" 26*810390e3Srobert #endif 27d89ec533Spatrick 28d89ec533Spatrick #ifndef __has_builtin 29d89ec533Spatrick # define __has_builtin(x) 0 30d89ec533Spatrick #endif 31d89ec533Spatrick 32d89ec533Spatrick // Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in 33d89ec533Spatrick // C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid. 34d89ec533Spatrick #ifndef ORC_RT_HAS_CPP_ATTRIBUTE 35d89ec533Spatrick #if defined(__cplusplus) && defined(__has_cpp_attribute) 36d89ec533Spatrick #define ORC_RT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) 37d89ec533Spatrick #else 38d89ec533Spatrick #define ORC_RT_HAS_CPP_ATTRIBUTE(x) 0 39d89ec533Spatrick #endif 40d89ec533Spatrick #endif 41d89ec533Spatrick 42d89ec533Spatrick // Use the 'nodiscard' attribute in C++17 or newer mode. 43d89ec533Spatrick #if defined(__cplusplus) && __cplusplus > 201402L && \ 44d89ec533Spatrick ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard) 45d89ec533Spatrick #define ORC_RT_NODISCARD [[nodiscard]] 46d89ec533Spatrick #elif ORC_RT_HAS_CPP_ATTRIBUTE(clang::warn_unused_result) 47d89ec533Spatrick #define ORC_RT_NODISCARD [[clang::warn_unused_result]] 48d89ec533Spatrick // Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also 49d89ec533Spatrick // warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518). 50d89ec533Spatrick // Use the 'nodiscard' attribute in C++14 mode only with GCC. 51d89ec533Spatrick // TODO: remove this workaround when PR33518 is resolved. 52d89ec533Spatrick #elif defined(__GNUC__) && ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard) 53d89ec533Spatrick #define ORC_RT_NODISCARD [[nodiscard]] 54d89ec533Spatrick #else 55d89ec533Spatrick #define ORC_RT_NODISCARD 56d89ec533Spatrick #endif 57d89ec533Spatrick 58d89ec533Spatrick #if __has_builtin(__builtin_expect) 59d89ec533Spatrick #define ORC_RT_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) 60d89ec533Spatrick #define ORC_RT_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) 61d89ec533Spatrick #else 62d89ec533Spatrick #define ORC_RT_LIKELY(EXPR) (EXPR) 63d89ec533Spatrick #define ORC_RT_UNLIKELY(EXPR) (EXPR) 64d89ec533Spatrick #endif 65d89ec533Spatrick 66*810390e3Srobert #if defined(__APPLE__) 67d89ec533Spatrick #define ORC_RT_WEAK_IMPORT __attribute__((weak_import)) 68*810390e3Srobert #elif defined(_WIN32) 69*810390e3Srobert #define ORC_RT_WEAK_IMPORT 70d89ec533Spatrick #else 71d89ec533Spatrick #define ORC_RT_WEAK_IMPORT __attribute__((weak)) 72d89ec533Spatrick #endif 73d89ec533Spatrick 74d89ec533Spatrick #endif // ORC_RT_COMPILER_H 75