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Diffstat (limited to 'com32/include/klibc/compiler.h')
-rw-r--r-- | com32/include/klibc/compiler.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/com32/include/klibc/compiler.h b/com32/include/klibc/compiler.h new file mode 100644 index 00000000..f8065066 --- /dev/null +++ b/com32/include/klibc/compiler.h @@ -0,0 +1,115 @@ +/* + * klibc/compiler.h + * + * Various compiler features + */ + +#ifndef _KLIBC_COMPILER_H +#define _KLIBC_COMPILER_H + +#define __user + +/* 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 that *must* be inlined */ +#ifdef __GNUC__ +# if __GNUC_MAJOR__ >= 3 +# define __must_inline static __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_MAJOR__ >= 3) +# define __mallocfunc __attribute__((malloc)) +#else +# define __mallocfunc +#endif + +/* likely/unlikely */ +#if defined(__GNUC__) && (__GNUC_MAJOR__ > 2 || (__GNUC_MAJOR__ == 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 + +/* Constructors and destructors */ +#define __constructor __attribute__((constructor)) +#define __destructor __attribute__((destructor)) + +#endif |