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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-exception6//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_H16#define ORC_RT_COMPILER_H17 18#if defined(_WIN32)19#define ORC_RT_INTERFACE extern "C"20#define ORC_RT_HIDDEN21#define ORC_RT_IMPORT extern "C" __declspec(dllimport)22#else23#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#endif27 28#ifndef __has_builtin29# define __has_builtin(x) 030#endif31 32// Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in33// C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.34#ifndef ORC_RT_HAS_CPP_ATTRIBUTE35#if defined(__cplusplus) && defined(__has_cpp_attribute)36#define ORC_RT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)37#else38#define ORC_RT_HAS_CPP_ATTRIBUTE(x) 039#endif40#endif41 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 also49// 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#else55#define ORC_RT_NODISCARD56#endif57 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#else62#define ORC_RT_LIKELY(EXPR) (EXPR)63#define ORC_RT_UNLIKELY(EXPR) (EXPR)64#endif65 66#if defined(__APPLE__)67#define ORC_RT_WEAK_IMPORT __attribute__((weak_import))68#elif defined(_WIN32)69#define ORC_RT_WEAK_IMPORT70#else71#define ORC_RT_WEAK_IMPORT __attribute__((weak))72#endif73 74#endif // ORC_RT_COMPILER_H75