| /*===---- stdckdint.h - Standard header for checking integer----------------=== |
| * |
| * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| * See https://llvm.org/LICENSE.txt for license information. |
| * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| * |
| *===-----------------------------------------------------------------------=== |
| */ |
| |
| #ifndef __STDCKDINT_H |
| #define __STDCKDINT_H |
| |
| /* If we're hosted, fall back to the system's stdckdint.h. FreeBSD, for |
| * example, already has a Clang-compatible stdckdint.h header. |
| * |
| * The `stdckdint.h` header requires C 23 or newer. |
| */ |
| #if __STDC_HOSTED__ && __has_include_next(<stdckdint.h>) |
| #include_next <stdckdint.h> |
| #else |
| |
| /* C23 7.20.1 Defines several macros for performing checked integer arithmetic*/ |
| |
| #define __STDC_VERSION_STDCKDINT_H__ 202311L |
| |
| // Both A and B shall be any integer type other than "plain" char, bool, a bit- |
| // precise integer type, or an enumerated type, and they need not be the same. |
| |
| // R shall be a modifiable lvalue of any integer type other than "plain" char, |
| // bool, a bit-precise integer type, or an enumerated type. It shouldn't be |
| // short type, either. Otherwise, it may be unable to hold two the result of |
| // operating two 'int's. |
| |
| // A diagnostic message will be produced if A or B are not suitable integer |
| // types, or if R is not a modifiable lvalue of a suitable integer type or R |
| // is short type. |
| #define ckd_add(R, A, B) __builtin_add_overflow((A), (B), (R)) |
| #define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R)) |
| #define ckd_mul(R, A, B) __builtin_mul_overflow((A), (B), (R)) |
| |
| #endif /* __STDC_HOSTED__ */ |
| #endif /* __STDCKDINT_H */ |
