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compiler.h
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/*
* Copyright (c) 2008 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __COMPILER_H
#define __COMPILER_H
#ifndef __ASSEMBLY__
#if __GNUC__
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#define __UNUSED __attribute__((__unused__))
#define __PACKED __attribute__((packed))
#define __ALIGNED(x) __attribute__((aligned(x)))
#define __PRINTFLIKE(__fmt,__varargs) __attribute__((__format__ (__printf__, __fmt, __varargs)))
#define __SCANFLIKE(__fmt,__varargs) __attribute__((__format__ (__scanf__, __fmt, __varargs)))
#define __SECTION(x) __attribute((section(x)))
#define __PURE __attribute((pure))
#define __CONST __attribute((const))
#define __NO_RETURN __attribute__((noreturn))
#define __MALLOC __attribute__((malloc))
#define __WEAK __attribute__((weak))
#define __GNU_INLINE __attribute__((gnu_inline))
#define __GET_CALLER(x) __builtin_return_address(0)
#define __GET_FRAME(x) __builtin_frame_address(0)
#define INCBIN(symname, sizename, filename, section) \
__asm__ (".section " section "; .align 4; .globl "#symname); \
__asm__ (""#symname ":\n.incbin \"" filename "\""); \
__asm__ (".section " section "; .align 1;"); \
__asm__ (""#symname "_end:"); \
__asm__ (".section " section "; .align 4; .globl "#sizename); \
__asm__ (""#sizename ": .long "#symname "_end - "#symname " - 1"); \
extern unsigned char symname[]; \
extern unsigned int sizename
#define INCFILE(symname, sizename, filename) INCBIN(symname, sizename, filename, ".rodata")
/* look for gcc 3.0 and above */
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 0)
#define __ALWAYS_INLINE __attribute__((always_inline))
#else
#define __ALWAYS_INLINE
#endif
/* look for gcc 3.1 and above */
#if !defined(__DEPRECATED) // seems to be built in in some versions of the compiler
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
#define __DEPRECATED __attribute((deprecated))
#else
#define __DEPRECATED
#endif
#endif
/* look for gcc 3.3 and above */
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
/* the may_alias attribute was introduced in gcc 3.3; before that, there
* was no way to specify aliasiang rules on a type-by-type basis */
#define __MAY_ALIAS __attribute__((may_alias))
/* nonnull was added in gcc 3.3 as well */
#define __NONNULL(x) __attribute((nonnull x))
#else
#define __MAY_ALIAS
#define __NONNULL(x)
#endif
/* look for gcc 3.4 and above */
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
#define __WARN_UNUSED_RESULT __attribute((warn_unused_result))
#else
#define __WARN_UNUSED_RESULT
#endif
#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
#define __EXTERNALLY_VISIBLE __attribute__((externally_visible))
#else
#define __EXTERNALLY_VISIBLE
#endif
#else
#define likely(x) (x)
#define unlikely(x) (x)
#define __UNUSED
#define __PACKED
#define __ALIGNED(x)
#define __PRINTFLIKE(__fmt,__varargs)
#define __SCANFLIKE(__fmt,__varargs)
#define __SECTION(x)
#define __PURE
#define __CONST
#define __NONNULL(x)
#define __DEPRECATED
#define __WARN_UNUSED_RESULT
#define __ALWAYS_INLINE
#define __MAY_ALIAS
#define __NO_RETURN
#endif
#endif
/* TODO: add type check */
#define countof(a) (sizeof(a) / sizeof((a)[0]))
#endif