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/*
* Copyright 2008-2013 Various Authors
* Copyright 2005 Timo Hirvonen
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef CMUS_COMPILER_H
#define CMUS_COMPILER_H
#include <stddef.h>
/*
* GCC 2.96 or compatible required
*/
#if defined(__GNUC__)
#if __GNUC__ > 3
#undef offsetof
#define offsetof(type, member) __builtin_offsetof(type, member)
#endif
/* Optimization: Condition @x is likely */
#define likely(x) __builtin_expect(!!(x), 1)
/* Optimization: Condition @x is unlikely */
#define unlikely(x) __builtin_expect(!!(x), 0)
#ifndef UNUSED
#define UNUSED __attribute__((unused))
#endif
#else
#define likely(x) (x)
#define unlikely(x) (x)
#define UNUSED
#endif
/* Optimization: Function never returns */
#define CMUS_NORETURN __attribute__((__noreturn__))
/* Argument at index @fmt_idx is printf compatible format string and
* argument at index @first_idx is the first format argument */
#define CMUS_FORMAT(fmt_idx, first_idx) __attribute__((format(printf, (fmt_idx), (first_idx))))
#if defined(__GNUC__) && (__GNUC__ >= 3)
/* Optimization: Pointer returned can't alias other pointers */
#define CMUS_MALLOC __attribute__((__malloc__))
#else
#define CMUS_MALLOC
#endif
/**
* container_of - cast a member of a structure out to the containing structure
*
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
*/
#define container_of_portable(ptr, type, member) \
((type *)(void *)( (char *)(ptr) - offsetof(type,member)))
#undef container_of
#if defined(__GNUC__)
#define container_of(ptr, type, member) __extension__ ({ \
const __typeof__( ((type *)0)->member) *_mptr = (ptr); \
container_of_portable(_mptr, type, member);})
#else
#define container_of(ptr, type, member) container_of_portable(ptr, type, member)
#endif
#endif
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