compiler.h

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/*****************************************************************************/
/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>,
 *               Frank Mehnert <fm3@os.inf.tu-dresden.de>,
 *               Jork Löser <jork@os.inf.tu-dresden.de>,
 *               Ronald Aigner <ra3@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
/*****************************************************************************/
#ifndef __L4_COMPILER_H__
#define __L4_COMPILER_H__

#if !defined(__ASSEMBLY__) && !defined(__ASSEMBLER__)


#ifndef L4_INLINE
#ifndef __cplusplus
#  ifdef __OPTIMIZE__
#    define L4_INLINE_STATIC static __inline__
#    define L4_INLINE_EXTERN extern __inline__
#    ifdef __GNUC_STDC_INLINE__
#      define L4_INLINE L4_INLINE_STATIC
#    else
#      define L4_INLINE L4_INLINE_EXTERN
#    endif
#  else /* ! __OPTIMIZE__ */
#    define L4_INLINE static
#  endif /* ! __OPTIMIZE__ */
#else /* __cplusplus */
#  define L4_INLINE inline
#endif  /* __cplusplus */
#endif  /* L4_INLINE */

#define L4_ALWAYS_INLINE L4_INLINE __attribute__((__always_inline__))


#define L4_DECLARE_CONSTRUCTOR(func, prio) \
  static inline __attribute__((constructor(prio))) void func ## _ctor_func(void) { func(); }


#ifndef __cplusplus
#  define L4_NOTHROW__A       __attribute__((nothrow))
#  define L4_NOTHROW
#  define EXTERN_C_BEGIN
#  define EXTERN_C_END
#  define EXTERN_C
#  ifndef __BEGIN_DECLS
#    define __BEGIN_DECLS
#  endif
#  ifndef __END_DECLS
#    define __END_DECLS
#  endif
#  define L4_DEFAULT_PARAM(x)
#else /* __cplusplus */
#  if __cplusplus >= 201103L
#    define L4_NOTHROW noexcept
#  else /* C++ < 11 */
#    define L4_NOTHROW throw()
#  endif
#  define EXTERN_C_BEGIN extern "C" {
#  define EXTERN_C_END }
#  define EXTERN_C extern "C"
#  ifndef __BEGIN_DECLS
#    define __BEGIN_DECLS extern "C" {
#  endif
#  ifndef __END_DECLS
#    define __END_DECLS }
#  endif
#  define L4_DEFAULT_PARAM(x) = x
#endif /* __cplusplus */

#define L4_NORETURN __attribute__((noreturn))

#define L4_PURE __attribute__((pure))

#define L4_NOINSTRUMENT __attribute__((no_instrument_function))
#ifndef L4_HIDDEN
#  define L4_HIDDEN __attribute__((visibility("hidden")))
#endif
#ifndef L4_EXPORT
#  define L4_EXPORT __attribute__((visibility("default")))
#endif
#ifndef L4_EXPORT_TYPE
#  ifdef __cplusplus
#    define L4_EXPORT_TYPE __attribute__((visibility("default")))
#  else
#    define L4_EXPORT_TYPE
#  endif
#endif
#define L4_STRONG_ALIAS(name, aliasname) L4__STRONG_ALIAS(name, aliasname)
#define L4__STRONG_ALIAS(name, aliasname) \
  extern __typeof (name) aliasname __attribute__ ((alias (#name)));


#endif /* !__ASSEMBLY__ */

#include <l4/sys/linkage.h>

#define L4_LIKELY(x)  __builtin_expect((x),1)   
#define L4_UNLIKELY(x)  __builtin_expect((x),0)   

/* Make sure that the function is not removed by optimization. Without the
 * "used" attribute, unreferenced static functions are removed. */
#define L4_STICKY(x)     __attribute__((used)) x         
#define L4_DEPRECATED(s) __attribute__((deprecated(s)))  

#ifndef __GXX_EXPERIMENTAL_CXX0X__
#ifndef static_assert
#define static_assert(x, y) \
  do { (void)sizeof(char[-(!(x))]); } while (0)
#endif
#endif

#define L4_stringify_helper(x) #x                       
#define L4_stringify(x)        L4_stringify_helper(x)   

#ifndef __ASSEMBLER__

L4_INLINE void l4_barrier(void);

L4_INLINE void l4_mb(void);

L4_INLINE void l4_wmb(void);


/* Implementations */
L4_INLINE void l4_barrier(void)
{
  __asm__ __volatile__ ("" : : : "memory");
}

L4_INLINE void l4_mb(void)
{
  __asm__ __volatile__ ("" : : : "memory");
}

L4_INLINE void l4_wmb(void)
{
  __asm__ __volatile__ ("" : : : "memory");
}
#endif

#endif /* !__L4_COMPILER_H__ */