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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: clib/type.h $ */
/* */
/* OpenPOWER FFS Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2014,2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
/*! @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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