stdckdint.h (1666B) - Raw
1 /*===---- stdckdint.h - Standard header for checking integer----------------=== 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 10 #ifndef __STDCKDINT_H 11 #define __STDCKDINT_H 12 13 /* If we're hosted, fall back to the system's stdckdint.h. FreeBSD, for 14 * example, already has a Clang-compatible stdckdint.h header. 15 * 16 * The `stdckdint.h` header requires C 23 or newer. 17 */ 18 #if __STDC_HOSTED__ && __has_include_next(<stdckdint.h>) 19 #include_next <stdckdint.h> 20 #else 21 22 /* C23 7.20.1 Defines several macros for performing checked integer arithmetic*/ 23 24 #define __STDC_VERSION_STDCKDINT_H__ 202311L 25 26 // Both A and B shall be any integer type other than "plain" char, bool, a bit- 27 // precise integer type, or an enumerated type, and they need not be the same. 28 29 // R shall be a modifiable lvalue of any integer type other than "plain" char, 30 // bool, a bit-precise integer type, or an enumerated type. It shouldn't be 31 // short type, either. Otherwise, it may be unable to hold two the result of 32 // operating two 'int's. 33 34 // A diagnostic message will be produced if A or B are not suitable integer 35 // types, or if R is not a modifiable lvalue of a suitable integer type or R 36 // is short type. 37 #define ckd_add(R, A, B) __builtin_add_overflow((A), (B), (R)) 38 #define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R)) 39 #define ckd_mul(R, A, B) __builtin_mul_overflow((A), (B), (R)) 40 41 #endif /* __STDC_HOSTED__ */ 42 #endif /* __STDCKDINT_H */