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