1 files changed, 158 insertions, 0 deletions
diff --git a/usr/include/klibc/compiler.h b/usr/include/klibc/compiler.h
new file mode 100644
index 0000000..ff5a006
--- /dev/null
+++ b/usr/include/klibc/compiler.h
@@ -0,0 +1,158 @@
+/*
+ * klibc/compiler.h
+ *
+ * Various compiler features
+ */
+
+#ifndef _KLIBC_COMPILER_H
+#define _KLIBC_COMPILER_H
+
+/* Specific calling conventions */
+/* __cdecl is used when we want varadic and non-varadic functions to have
+   the same binary calling convention. */
+#ifdef __i386__
+# ifdef __GNUC__
+#  define __cdecl __attribute__((cdecl,regparm(0)))
+# else
+  /* Most other C compilers have __cdecl as a keyword */
+# endif
+#else
+# define __cdecl		/* Meaningless on non-i386 */
+#endif
+
+/*
+ * How to declare a function which should be inlined or instantiated locally
+ */
+#ifdef __GNUC__
+# ifdef __GNUC_STDC_INLINE__
+#  define __static_inline static __inline__ __attribute__((__gnu_inline__))
+# else
+#  define __static_inline static __inline__
+# endif
+#else
+# define __static_inline inline	/* Just hope this works... */
+#endif
+
+/*
+ * How to declare a function which should be inlined or have a call to
+ * an external module
+ */
+#ifdef __GNUC__
+# ifdef __GNUC_STDC_INLINE__
+#  define __extern_inline extern __inline__ __attribute__((__gnu_inline__))
+# else
+#  define __extern_inline extern __inline__
+# endif
+#else
+# define __extern_inline inline	/* Just hope this works... */
+#endif
+
+/* How to declare a function that *must* be inlined */
+/* Use "extern inline" even in the gcc3+ case to avoid warnings in ctype.h */
+#ifdef __GNUC__
+# if __GNUC__ >= 3
+#  define __must_inline __extern_inline __attribute__((__always_inline__))
+# else
+#  define __must_inline extern __inline__
+# endif
+#else
+# define __must_inline inline	/* Just hope this works... */
+#endif
+
+/* How to declare a function that does not return */
+#ifdef __GNUC__
+# define __noreturn void __attribute__((noreturn))
+#else
+# define __noreturn void
+#endif
+
+/* "const" function:
+
+     Many functions do not examine any values except their arguments,
+     and have no effects except the return value.  Basically this is
+     just slightly more strict class than the `pure' attribute above,
+     since function is not allowed to read global memory.
+
+     Note that a function that has pointer arguments and examines the
+     data pointed to must _not_ be declared `const'.  Likewise, a
+     function that calls a non-`const' function usually must not be
+     `const'.  It does not make sense for a `const' function to return
+     `void'.
+*/
+#ifdef __GNUC__
+# define __constfunc __attribute__((const))
+#else
+# define __constfunc
+#endif
+#undef __attribute_const__
+#define __attribute_const__ __constfunc
+
+/* "pure" function:
+
+     Many functions have no effects except the return value and their
+     return value depends only on the parameters and/or global
+     variables.  Such a function can be subject to common subexpression
+     elimination and loop optimization just as an arithmetic operator
+     would be.  These functions should be declared with the attribute
+     `pure'.
+*/
+#ifdef __GNUC__
+# define __purefunc __attribute__((pure))
+#else
+# define __purefunc
+#endif
+#undef __attribute_pure__
+#define __attribute_pure__ __purefunc
+
+/* Format attribute */
+#ifdef __GNUC__
+# define __formatfunc(t,f,a) __attribute__((format(t,f,a)))
+#else
+# define __formatfunc(t,f,a)
+#endif
+
+/* malloc() function (returns unaliased pointer) */
+#if defined(__GNUC__) && (__GNUC__ >= 3)
+# define __mallocfunc __attribute__((malloc))
+#else
+# define __mallocfunc
+#endif
+
+/* likely/unlikely */
+#if defined(__GNUC__) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95))
+# define __likely(x)   __builtin_expect(!!(x), 1)
+# define __unlikely(x) __builtin_expect(!!(x), 0)
+#else
+# define __likely(x)   (!!(x))
+# define __unlikely(x) (!!(x))
+#endif
+
+/* Possibly unused function */
+#ifdef __GNUC__
+# define __unusedfunc	__attribute__((unused))
+#else
+# define __unusedfunc
+#endif
+
+/* It's all user space... */
+#define __user
+
+/* The bitwise attribute: disallow arithmetric operations */
+#ifdef __CHECKER__		/* sparse only */
+# define __bitwise	__attribute__((bitwise))
+#else
+# define __bitwise
+#endif
+
+/* Shut up unused warnings */
+#ifdef __GNUC__
+# define __attribute_used__ __attribute__((used))
+#else
+# define __attribute_used__
+#endif
+
+/* Compiler pragma to make an alias symbol */
+#define __ALIAS(__t, __f, __p, __a) \
+  __t __f __p __attribute__((weak, alias(#__a)));
+
+#endif