1bd6c93c0SLang Hames //===--------- compiler.h - Compiler abstraction support --------*- C++ -*-===// 2bd6c93c0SLang Hames // 3bd6c93c0SLang Hames // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4bd6c93c0SLang Hames // See https://llvm.org/LICENSE.txt for license information. 5bd6c93c0SLang Hames // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6bd6c93c0SLang Hames // 7bd6c93c0SLang Hames //===----------------------------------------------------------------------===// 8bd6c93c0SLang Hames // 9bd6c93c0SLang Hames // This file is a part of the ORC runtime support library. 10bd6c93c0SLang Hames // 11bd6c93c0SLang Hames // Most functionality in this file was swiped from llvm/Support/Compiler.h. 12bd6c93c0SLang Hames // 13bd6c93c0SLang Hames //===----------------------------------------------------------------------===// 14bd6c93c0SLang Hames 15bd6c93c0SLang Hames #ifndef ORC_RT_COMPILER_H 16bd6c93c0SLang Hames #define ORC_RT_COMPILER_H 17bd6c93c0SLang Hames 18*9189a266SSunho Kim #if defined(_WIN32) 19*9189a266SSunho Kim #define ORC_RT_INTERFACE extern "C" 20*9189a266SSunho Kim #define ORC_RT_HIDDEN 21*9189a266SSunho Kim #define ORC_RT_IMPORT extern "C" __declspec(dllimport) 22*9189a266SSunho Kim #else 23bd6c93c0SLang Hames #define ORC_RT_INTERFACE extern "C" __attribute__((visibility("default"))) 24bd6c93c0SLang Hames #define ORC_RT_HIDDEN __attribute__((visibility("hidden"))) 25*9189a266SSunho Kim #define ORC_RT_IMPORT extern "C" 26*9189a266SSunho Kim #endif 27bd6c93c0SLang Hames 28eaa329e7SLang Hames #ifndef __has_builtin 29eaa329e7SLang Hames # define __has_builtin(x) 0 30eaa329e7SLang Hames #endif 31eaa329e7SLang Hames 32bd6c93c0SLang Hames // Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in 33bd6c93c0SLang Hames // C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid. 34bd6c93c0SLang Hames #ifndef ORC_RT_HAS_CPP_ATTRIBUTE 35bd6c93c0SLang Hames #if defined(__cplusplus) && defined(__has_cpp_attribute) 36bd6c93c0SLang Hames #define ORC_RT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) 37bd6c93c0SLang Hames #else 38bd6c93c0SLang Hames #define ORC_RT_HAS_CPP_ATTRIBUTE(x) 0 39bd6c93c0SLang Hames #endif 40bd6c93c0SLang Hames #endif 41bd6c93c0SLang Hames 42bd6c93c0SLang Hames // Use the 'nodiscard' attribute in C++17 or newer mode. 43bd6c93c0SLang Hames #if defined(__cplusplus) && __cplusplus > 201402L && \ 44bd6c93c0SLang Hames ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard) 45bd6c93c0SLang Hames #define ORC_RT_NODISCARD [[nodiscard]] 46bd6c93c0SLang Hames #elif ORC_RT_HAS_CPP_ATTRIBUTE(clang::warn_unused_result) 47bd6c93c0SLang Hames #define ORC_RT_NODISCARD [[clang::warn_unused_result]] 48bd6c93c0SLang Hames // Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also 49bd6c93c0SLang Hames // warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518). 50bd6c93c0SLang Hames // Use the 'nodiscard' attribute in C++14 mode only with GCC. 51bd6c93c0SLang Hames // TODO: remove this workaround when PR33518 is resolved. 52bd6c93c0SLang Hames #elif defined(__GNUC__) && ORC_RT_HAS_CPP_ATTRIBUTE(nodiscard) 53bd6c93c0SLang Hames #define ORC_RT_NODISCARD [[nodiscard]] 54bd6c93c0SLang Hames #else 55bd6c93c0SLang Hames #define ORC_RT_NODISCARD 56bd6c93c0SLang Hames #endif 57bd6c93c0SLang Hames 58bd6c93c0SLang Hames #if __has_builtin(__builtin_expect) 59bd6c93c0SLang Hames #define ORC_RT_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) 60bd6c93c0SLang Hames #define ORC_RT_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) 61bd6c93c0SLang Hames #else 62bd6c93c0SLang Hames #define ORC_RT_LIKELY(EXPR) (EXPR) 63bd6c93c0SLang Hames #define ORC_RT_UNLIKELY(EXPR) (EXPR) 64bd6c93c0SLang Hames #endif 65bd6c93c0SLang Hames 66*9189a266SSunho Kim #if defined(__APPLE__) 67ebec9559SLang Hames #define ORC_RT_WEAK_IMPORT __attribute__((weak_import)) 68*9189a266SSunho Kim #elif defined(_WIN32) 69*9189a266SSunho Kim #define ORC_RT_WEAK_IMPORT 70aa69f0d8SLang Hames #else 71ebec9559SLang Hames #define ORC_RT_WEAK_IMPORT __attribute__((weak)) 72aa69f0d8SLang Hames #endif 73aa69f0d8SLang Hames 74bd6c93c0SLang Hames #endif // ORC_RT_COMPILER_H 75