diff options
Diffstat (limited to 'include/linux/typecheck.h')
-rw-r--r-- | include/linux/typecheck.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/typecheck.h b/include/linux/typecheck.h new file mode 100644 index 000000000..46b15e2aa --- /dev/null +++ b/include/linux/typecheck.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef TYPECHECK_H_INCLUDED +#define TYPECHECK_H_INCLUDED + +/* + * Check at compile time that something is of a particular type. + * Always evaluates to 1 so you may use it easily in comparisons. + */ +#define typecheck(type,x) \ +({ type __dummy; \ + typeof(x) __dummy2; \ + (void)(&__dummy == &__dummy2); \ + 1; \ +}) + +/* + * Check at compile time that 'function' is a certain type, or is a pointer + * to that type (needs to use typedef for the function type.) + */ +#define typecheck_fn(type,function) \ +({ typeof(type) __tmp = function; \ + (void)__tmp; \ +}) + +/* + * Check at compile time that something is a pointer type. + */ +#define typecheck_pointer(x) \ +({ typeof(x) __dummy; \ + (void)sizeof(*__dummy); \ + 1; \ +}) + +#endif /* TYPECHECK_H_INCLUDED */ |