1 #ifndef _BABELTRACE_COMPILER_H 2 #define _BABELTRACE_COMPILER_H 3 4 /* 5 * compiler.h 6 * 7 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a copy 10 * of this software and associated documentation files (the "Software"), to deal 11 * in the Software without restriction, including without limitation the rights 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13 * copies of the Software, and to permit persons to whom the Software is 14 * furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 25 * SOFTWARE. 26 */ 27 28 #include <stddef.h> /* for offsetof */ 29 30 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)])) 31 32 #ifndef container_of 33 #define container_of(ptr, type, member) \ 34 ({ \ 35 const typeof(((type *)NULL)->member) * __ptr = (ptr); \ 36 (type *)((char *)__ptr - offsetof(type, member)); \ 37 }) 38 #endif 39 40 #endif /* _BABELTRACE_COMPILER_H */ 41