2 * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Implementation of offset_of and container_of
24 * @author Sebastian Hack
26 #ifndef FIRM_ADT_OFFSET_H
27 #define FIRM_ADT_OFFSET_H
30 * Get the offset of a member of a struct.
31 * @param type The type of the struct member is in.
32 * @param member The name of the member.
33 * @return The offset of member in type in bytes.
35 #define firm_offset_of(type, member) ((char *) &((type *) 0)->member - (char *) 0)
38 * Make pointer to the struct from a pointer to a member of that struct.
39 * @param ptr The pointer to the member.
40 * @param type The type of the struct.
41 * @param member The name of the member.
42 * @return A pointer to the struct member is in.
44 #define firm_container_of(ptr, type, member) ((type *) ((char *) (ptr) - firm_offset_of(type, member)))