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helper.h
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helper.h
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#ifndef _HELPER_H_
#define _HELPER_H_
#include <stdint.h>
#include "uint16.h"
#include "uint32.h"
#include "uint64.h"
#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
#define bos0(dest) __builtin_object_size(dest, 0)
/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
#define djb_roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
#define noinline __attribute__((noinline))
#undef inline
#undef __inline__
#undef __inline
#undef __always_inline
#define __always_inline inline __attribute__((always_inline))
#undef __must_check
#ifndef __INTEL_COMPILER
#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
#define __must_check __attribute__((warn_unused_result))
#else
#define __must_check
#endif
#else
#define __must_check
#endif
/*
* min()/max() macros that also do
* strict type-checking.. See the
* "unnecessary" pointer comparison.
*/
#define min(x,y) ({ \
typeof(x) _x = (x); \
typeof(y) _y = (y); \
(void) (&_x == &_y); \
_x < _y ? _x : _y; })
#define max(x,y) ({ \
typeof(x) _x = (x); \
typeof(y) _y = (y); \
(void) (&_x == &_y); \
_x > _y ? _x : _y; })
#define prefetch(x) __builtin_prefetch(x)
struct __una_u16 { uint16 x __attribute__((packed)); };
struct __una_u32 { uint32 x __attribute__((packed)); };
struct __una_u64 { uint64 x __attribute__((packed)); };
static inline uint16 __get_unaligned_cpu16(const void *p)
{
const struct __una_u16 *ptr = (const struct __una_u16 *)p;
return ptr->x;
}
static inline uint32 __get_unaligned_cpu32(const void *p)
{
const struct __una_u32 *ptr = (const struct __una_u32 *)p;
return ptr->x;
}
static inline uint64 __get_unaligned_cpu64(const void *p)
{
const struct __una_u64 *ptr = (const struct __una_u64 *)p;
return ptr->x;
}
static inline void __put_unaligned_cpu16(uint16 val, void *p)
{
struct __una_u16 *ptr = (struct __una_u16 *)p;
ptr->x = val;
}
static inline void __put_unaligned_cpu32(uint32 val, void *p)
{
struct __una_u32 *ptr = (struct __una_u32 *)p;
ptr->x = val;
}
static inline void __put_unaligned_cpu64(uint64 val, void *p)
{
struct __una_u64 *ptr = (struct __una_u64 *)p;
ptr->x = val;
}
/*
* ..and if you can't take the strict
* types, you can specify one yourself.
*
* Or not use min/max at all, of course.
*/
#define min_t(type,x,y) \
({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
#define max_t(type,x,y) \
({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
//#define offsetof(___TYPE, ___MEMBER) __builtin_offsetof(___TYPE, ___MEMBER)
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
*/
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
/*
* 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; \
})
#endif