1*bb722a7dSDimitry Andric //===-- Portable attributes -------------------------------------*- C++ -*-===// 2*bb722a7dSDimitry Andric // 3*bb722a7dSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*bb722a7dSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*bb722a7dSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*bb722a7dSDimitry Andric // 7*bb722a7dSDimitry Andric //===----------------------------------------------------------------------===// 8*bb722a7dSDimitry Andric // This header file defines macros for declaring attributes for functions, 9*bb722a7dSDimitry Andric // types, and variables. 10*bb722a7dSDimitry Andric // 11*bb722a7dSDimitry Andric // These macros are used within llvm-libc and allow the compiler to optimize, 12*bb722a7dSDimitry Andric // where applicable, certain function calls. 13*bb722a7dSDimitry Andric // 14*bb722a7dSDimitry Andric // Most macros here are exposing GCC or Clang features, and are stubbed out for 15*bb722a7dSDimitry Andric // other compilers. 16*bb722a7dSDimitry Andric 17*bb722a7dSDimitry Andric #ifndef LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H 18*bb722a7dSDimitry Andric #define LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H 19*bb722a7dSDimitry Andric 20*bb722a7dSDimitry Andric #include "properties/architectures.h" 21*bb722a7dSDimitry Andric 22*bb722a7dSDimitry Andric #ifndef __has_attribute 23*bb722a7dSDimitry Andric #define __has_attribute(x) 0 24*bb722a7dSDimitry Andric #endif 25*bb722a7dSDimitry Andric 26*bb722a7dSDimitry Andric #define LIBC_INLINE inline 27*bb722a7dSDimitry Andric #define LIBC_INLINE_VAR inline 28*bb722a7dSDimitry Andric #define LIBC_INLINE_ASM __asm__ __volatile__ 29*bb722a7dSDimitry Andric #define LIBC_UNUSED __attribute__((unused)) 30*bb722a7dSDimitry Andric 31*bb722a7dSDimitry Andric #ifdef LIBC_TARGET_ARCH_IS_GPU 32*bb722a7dSDimitry Andric #define LIBC_THREAD_LOCAL 33*bb722a7dSDimitry Andric #else 34*bb722a7dSDimitry Andric #define LIBC_THREAD_LOCAL thread_local 35*bb722a7dSDimitry Andric #endif 36*bb722a7dSDimitry Andric 37*bb722a7dSDimitry Andric #if __cplusplus >= 202002L 38*bb722a7dSDimitry Andric #define LIBC_CONSTINIT constinit 39*bb722a7dSDimitry Andric #elif __has_attribute(__require_constant_initialization__) 40*bb722a7dSDimitry Andric #define LIBC_CONSTINIT __attribute__((__require_constant_initialization__)) 41*bb722a7dSDimitry Andric #else 42*bb722a7dSDimitry Andric #define LIBC_CONSTINIT 43*bb722a7dSDimitry Andric #endif 44*bb722a7dSDimitry Andric 45*bb722a7dSDimitry Andric #if defined(__clang__) && __has_attribute(preferred_type) 46*bb722a7dSDimitry Andric #define LIBC_PREFERED_TYPE(TYPE) [[clang::preferred_type(TYPE)]] 47*bb722a7dSDimitry Andric #else 48*bb722a7dSDimitry Andric #define LIBC_PREFERED_TYPE(TYPE) 49*bb722a7dSDimitry Andric #endif 50*bb722a7dSDimitry Andric 51*bb722a7dSDimitry Andric #endif // LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H 52