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/*
* Copyright (c) International Business Machines Corp., 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! @file type.h
* @brief Type helpers
* @author Shaun Wetzstein <shaun@us.ibm.com>
* @date 2010-2011
*/
#ifndef __TYPE_H__
#define __TYPE_H__
#include "align.h"
/*!
* @def cast_type(e,T)
* @hideinitializer
* @brief Casts @em p to type @em T
* @param e [in] Expression
* @param T [in] Type name
*/
#define cast_type(e,T) \
((T)(e))
/*!
* @def check_type(e,T)
* @hideinitializer
* @brief Check the type of expression @em e is equal to type @em T
* @param e [in] Expression
* @param T [in] Type name
*/
#define check_type(e,T) \
((typeof(e) *)0 != (T *)0)
/*!
* @def check_types_match(e,T)
* @hideinitializer
* @brief Check the types of expressions @em e1 and @em e2 are equal
* @param e1 [in] Expression
* @param e2 [in] Expression
*/
#define check_types_match(e1,e2) \
((typeof(e1) *) 0 != (typeof(e2) *)0)
/*!
* @def container_of(member_ptr, containing_type, member)
* @hideinitializer
* @brief Returns a pointer to the containing structure of a member
* @param p [in] Pointer to a strucure member
* @param T [in] Type of the containing structure
* @param m [in] Name of the member @em p references
*/
#define container_of(p,T,m) \
((T *)((char *)(p) - offsetof(T,m)) - check_types_match(*(p),((T*)0)->m))
/*!
* @def container_of_var(member_ptr, var, member)
* @hideinitializer
* @brief Returns a pointer to the containing structure of a member
* @param p [in] Pointer to a strucure member
* @param v [in] Pointer to a variable with the same of type as the containing structure
* @param m [in] Name of the member @em p references
*/
#define container_of_var(p, v, m) \
container_of(p, typeof(*v), m)
#endif /* __TYPE_H__ */
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