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)
 *
 * License: see LICENSE.spdx (in this directory or the directories above)
 */
/*****************************************************************************/
#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 */
#elif defined DOXYGEN
#  define L4_INLINE inline
#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
#  ifndef __BEGIN_DECLS
#    define __BEGIN_DECLS
#  endif
#  ifndef __END_DECLS
#    define __END_DECLS
#  endif
#  define L4_BEGIN_DECLS
#  define L4_END_DECLS
#  define L4_DEFAULT_PARAM(x)
#else /* __cplusplus */
#  if __cplusplus >= 201103L
#    define L4_NOTHROW noexcept
#  else /* C++ < 11 */
#    define L4_NOTHROW throw()
#  endif
#  define L4_BEGIN_DECLS extern "C" {
#  define L4_END_DECLS }
#  if !defined __BEGIN_DECLS || defined DOXYGEN
#    define __BEGIN_DECLS extern "C" {
#  endif
#  if !defined __END_DECLS || defined DOXYGEN
#    define __END_DECLS }
#  endif
#  define L4_DEFAULT_PARAM(x) = x
#endif /* __cplusplus */
 
/* Depration hints during compile -- remove later (2025+) */
#ifndef EXTERN_C
#define EXTERN_C DO_NOT_USE_EXTERN_C_ANY_MORE
#endif
#ifndef EXTERN_C_BEGIN
#define EXTERN_C_BEGIN DO_NOT_USE_EXTERN_C_BEGIN_ANY_MORE__USE_L4_BEGIN_DECLS
#endif
#ifndef EXTERN_C_END
#define EXTERN_C_END DO_NOT_USE_EXTERN_C_END_ANY_MORE__USE_L4_END_DECLS
#endif
 
#if defined __cplusplus && __cplusplus >= 201402L
# define L4_CONSTEXPR constexpr
#else
# define L4_CONSTEXPR
#endif
 
#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
#if !defined L4_EXPORT || defined DOXYGEN
#  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)
#ifdef __clang__
#define L4__STRONG_ALIAS(name, aliasname) \
  extern __typeof (name) aliasname __attribute__ ((alias (#name)));
#else
#define L4__STRONG_ALIAS(name, aliasname) \
  extern __typeof (name) aliasname __attribute__ ((alias (#name), copy(name)));
#endif
 
#if defined(__i386__) || defined(__amd64__) || \
  defined(__arm__) || defined(__aarch64__) || \
  defined(__mips__) || defined(__riscv) || \
  defined(__powerpc__) || defined(__sparc__)
# define L4_STACK_ALIGN         __BIGGEST_ALIGNMENT__
#else
# error Define L4_STACK_ALIGN for this target!
#endif
 
#if defined(__i386__) || defined(__amd64__)
L4_INLINE unsigned long l4_align_stack_for_direct_fncall(unsigned long stack)
{
  if ((stack & (L4_STACK_ALIGN - 1)) == (L4_STACK_ALIGN - sizeof(unsigned long)))
    return stack;
  return (stack & ~(L4_STACK_ALIGN)) - sizeof(unsigned long);
}
#else
L4_INLINE unsigned long l4_align_stack_for_direct_fncall(unsigned long stack)
{
  return stack & ~(L4_STACK_ALIGN);
}
#endif
 
#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 static_assert
# if !defined(__cplusplus)
#  define static_assert(x, y) _Static_assert(x, y)
# elif __cplusplus < 201103L
#  define static_assert(x, y) \
   extern int l4_static_assert[-(!(x))] __attribute__((unused))
# endif
#endif
 
#define L4_stringify_helper(x) #x                       
#define L4_stringify(x)        L4_stringify_helper(x)   
 
#ifdef __has_builtin
#define L4_HAS_BUILTIN(def) __has_builtin(def)
#else
#define L4_HAS_BUILTIN(def) 0
#endif
 
#ifndef __ASSEMBLER__
L4_INLINE void l4_barrier(void);
 
L4_INLINE void l4_mb(void);
 
L4_INLINE void l4_wmb(void);
 
L4_INLINE L4_NORETURN void l4_infinite_loop(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");
}
 
L4_INLINE L4_NORETURN void l4_infinite_loop(void)
{
  while (1)
    l4_barrier();
}
#endif
 
#endif /* !__L4_COMPILER_H__ */