102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* Copyright 2008-2013 Various Authors
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* Copyright 2005 Timo Hirvonen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CMUS_COMPILER_H
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#define CMUS_COMPILER_H
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#include <stddef.h>
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/*
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* GCC 2.96 or compatible required
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*/
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#if defined(__GNUC__)
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#if __GNUC__ > 3
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#undef offsetof
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#define offsetof(type, member) __builtin_offsetof(type, member)
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#endif
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/* Optimization: Condition @x is likely */
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#define likely(x) __builtin_expect(!!(x), 1)
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/* Optimization: Condition @x is unlikely */
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#ifndef UNUSED
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#define UNUSED __attribute__((unused))
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#endif
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#else
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#define likely(x) (x)
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#define unlikely(x) (x)
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#define UNUSED
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#endif
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/* Optimization: Function never returns */
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#define CMUS_NORETURN __attribute__((__noreturn__))
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/* Argument at index @fmt_idx is printf compatible format string and
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* argument at index @first_idx is the first format argument */
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#define CMUS_FORMAT(fmt_idx, first_idx) __attribute__((format(printf, (fmt_idx), (first_idx))))
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#if defined(__GNUC__) && (__GNUC__ >= 3)
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/* Optimization: Pointer returned can't alias other pointers */
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#define CMUS_MALLOC __attribute__((__malloc__))
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#else
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#define CMUS_MALLOC
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#endif
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#if defined(__GNUC__) && (__GNUC__ >= 8)
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/* Silences the unterminated-string-initialization warnings */
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#define CMUS_NONSTRING __attribute__((nonstring))
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#else
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#define CMUS_NONSTRING
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#endif
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/**
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* container_of - cast a member of a structure out to the containing structure
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*
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* @ptr: the pointer to the member.
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* @type: the type of the container struct this is embedded in.
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* @member: the name of the member within the struct.
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*
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*/
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#define container_of_portable(ptr, type, member) \
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((type *)(void *)( (char *)(ptr) - offsetof(type,member)))
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#undef container_of
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#if defined(__GNUC__)
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#define container_of(ptr, type, member) __extension__ ({ \
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const __typeof__( ((type *)0)->member) *_mptr = (ptr); \
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container_of_portable(_mptr, type, member);})
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#else
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#define container_of(ptr, type, member) container_of_portable(ptr, type, member)
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#endif
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#endif
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