| 1 | /*- |
| 2 | * SPDX-License-Identifier: BSD-3-Clause |
| 3 | * |
| 4 | * Copyright (c) 1999 Marcel Moolenaar |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer |
| 12 | * in this position and unchanged. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. The name of the author may not be used to endorse or promote products |
| 17 | * derived from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #ifndef _SYS_ASSYM_H_ |
| 32 | #define _SYS_ASSYM_H_ |
| 33 | |
| 34 | #define ASSYM_BIAS 0x10000 /* avoid zero-length arrays */ |
| 35 | #define ASSYM_ABS(value) ((value) < 0 ? -((value) + 1) + 1ULL : (value)) |
| 36 | |
| 37 | #define ASSYM(name, value) \ |
| 38 | char name ## sign[((value) < 0 ? 1 : 0) + ASSYM_BIAS]; \ |
| 39 | char name ## w0[(ASSYM_ABS(value) & 0xFFFFU) + ASSYM_BIAS]; \ |
| 40 | char name ## w1[((ASSYM_ABS(value) & 0xFFFF0000UL) >> 16) + ASSYM_BIAS]; \ |
| 41 | char name ## w2[((ASSYM_ABS(value) & 0xFFFF00000000ULL) >> 32) + ASSYM_BIAS]; \ |
| 42 | char name ## w3[((ASSYM_ABS(value) & 0xFFFF000000000000ULL) >> 48) + ASSYM_BIAS] |
| 43 | |
| 44 | /* char name ## _datatype_ ## STRINGIFY(typeof(((struct parenttype *)(0x0))-> name)) [1]; */ |
| 45 | #ifdef OFFSET_TEST |
| 46 | #define OFFSET_CTASSERT CTASSERT |
| 47 | #else |
| 48 | #define OFFSET_CTASSERT(...) |
| 49 | #endif |
| 50 | |
| 51 | #define OFFSYM(name, parenttype, datatype) \ |
| 52 | char __assym_offset__ ## parenttype ## __ ## name ## __ ## datatype [offsetof(struct parenttype, name)]; \ |
| 53 | CTASSERT(__builtin_types_compatible_p(__typeof(((struct parenttype *)(0x0))-> name), datatype)); \ |
| 54 | OFFSET_CTASSERT(offsetof(struct parenttype, name) == offsetof(struct parenttype ## _lite, name)) |
| 55 | |
| 56 | #endif /* !_SYS_ASSYM_H_ */ |