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