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| 1 | //===-- Common definitions for LLVM-libc public header files --------------===// |
|---|---|
| 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 | #ifndef _LLVM_LIBC_COMMON_H |
| 10 | #define _LLVM_LIBC_COMMON_H |
| 11 | |
| 12 | #define __LLVM_LIBC__ 1 |
| 13 | |
| 14 | #ifdef __cplusplus |
| 15 | |
| 16 | #undef __BEGIN_C_DECLS |
| 17 | #define __BEGIN_C_DECLS extern "C" { |
| 18 | |
| 19 | #undef __END_C_DECLS |
| 20 | #define __END_C_DECLS } |
| 21 | |
| 22 | // Standard C++ doesn't have C99 restrict but GNU C++ has it with __ spelling. |
| 23 | #undef __restrict |
| 24 | #ifndef __GNUC__ |
| 25 | #define __restrict |
| 26 | #endif |
| 27 | |
| 28 | #undef _Noreturn |
| 29 | #define _Noreturn [[noreturn]] |
| 30 | |
| 31 | #undef _Alignas |
| 32 | #define _Alignas alignas |
| 33 | |
| 34 | #undef _Static_assert |
| 35 | #define _Static_assert static_assert |
| 36 | |
| 37 | #undef _Alignof |
| 38 | #define _Alignof alignof |
| 39 | |
| 40 | #undef _Thread_local |
| 41 | #define _Thread_local thread_local |
| 42 | |
| 43 | #undef __NOEXCEPT |
| 44 | #if __cplusplus >= 201103L |
| 45 | #define __NOEXCEPT noexcept |
| 46 | #else |
| 47 | #define __NOEXCEPT throw() |
| 48 | #endif |
| 49 | |
| 50 | // This macro serves as a generic cast implementation for use in both C and C++, |
| 51 | // similar to `__BIONIC_CAST` in Android. |
| 52 | #undef __LLVM_LIBC_CAST |
| 53 | #define __LLVM_LIBC_CAST(cast, type, value) (cast<type>(value)) |
| 54 | |
| 55 | #else // not __cplusplus |
| 56 | |
| 57 | #undef __BEGIN_C_DECLS |
| 58 | #define __BEGIN_C_DECLS |
| 59 | |
| 60 | #undef __END_C_DECLS |
| 61 | #define __END_C_DECLS |
| 62 | |
| 63 | #undef __restrict |
| 64 | #if __STDC_VERSION__ >= 199901L |
| 65 | // C99 and above support the restrict keyword. |
| 66 | #define __restrict restrict |
| 67 | #elif !defined(__GNUC__) |
| 68 | // GNU-compatible compilers accept the __ spelling in all modes. |
| 69 | // Otherwise, omit the qualifier for pure C89 compatibility. |
| 70 | #define __restrict |
| 71 | #endif |
| 72 | |
| 73 | #undef _Noreturn |
| 74 | #if __STDC_VERSION__ >= 201112L |
| 75 | // In C11 and later, _Noreturn is a keyword. |
| 76 | #elif defined(__GNUC__) |
| 77 | // GNU-compatible compilers have an equivalent attribute. |
| 78 | #define _Noreturn __attribute__((__noreturn__)) |
| 79 | #else |
| 80 | #define _Noreturn |
| 81 | #endif |
| 82 | |
| 83 | #undef __NOEXCEPT |
| 84 | #ifdef __GNUC__ |
| 85 | #define __NOEXCEPT __attribute__((__nothrow__)) |
| 86 | #else |
| 87 | #define __NOEXCEPT |
| 88 | #endif |
| 89 | |
| 90 | #undef _Returns_twice |
| 91 | #define _Returns_twice __attribute__((returns_twice)) |
| 92 | |
| 93 | #undef __LLVM_LIBC_CAST |
| 94 | #define __LLVM_LIBC_CAST(cast, type, value) ((type)(value)) |
| 95 | |
| 96 | #endif // __cplusplus |
| 97 | |
| 98 | #endif // _LLVM_LIBC_COMMON_H |
| 99 |
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