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[babeltrace.git] / include / ctf / align.h
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1#ifndef _CTF_ALIGN_H
2#define _CTF_ALIGN_H
3
4#include <ctf/compiler.h>
5
6#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a) - 1)
7#define __ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
8#define PTR_ALIGN(p, a) ((typeof(p)) ALIGN((unsigned long) (p), a))
9#define ALIGN_FLOOR(x, a) __ALIGN_FLOOR_MASK(x, (typeof(x)) (a) - 1)
10#define __ALIGN_FLOOR_MASK(x, mask) ((x) & ~(mask))
11#define PTR_ALIGN_FLOOR(p, a) \
12 ((typeof(p)) ALIGN_FLOOR((unsigned long) (p), a))
13#define IS_ALIGNED(x, a) (((x) & ((typeof(x)) (a) - 1)) == 0)
14
15/*
16 * Align pointer on natural object alignment.
17 */
18#define object_align(obj) PTR_ALIGN(obj, __alignof__(*(obj)))
19#define object_align_floor(obj) PTR_ALIGN_FLOOR(obj, __alignof__(*(obj)))
20
21/**
22 * offset_align - Calculate the offset needed to align an object on its natural
23 * alignment towards higher addresses.
24 * @align_drift: object offset from an "alignment"-aligned address.
25 * @alignment: natural object alignment. Must be non-zero, power of 2.
26 *
27 * Returns the offset that must be added to align towards higher
28 * addresses.
29 */
30#define offset_align(align_drift, alignment) \
31 ({ \
32 MAYBE_BUILD_BUG_ON((alignment) == 0 \
33 || ((alignment) & ((alignment) - 1))); \
34 (((alignment) - (align_drift)) & ((alignment) - 1)); \
35 })
36
37/**
38 * offset_align_floor - Calculate the offset needed to align an object
39 * on its natural alignment towards lower addresses.
40 * @align_drift: object offset from an "alignment"-aligned address.
41 * @alignment: natural object alignment. Must be non-zero, power of 2.
42 *
43 * Returns the offset that must be substracted to align towards lower addresses.
44 */
45#define offset_align_floor(align_drift, alignment) \
46 ({ \
47 MAYBE_BUILD_BUG_ON((alignment) == 0 \
48 || ((alignment) & ((alignment) - 1))); \
49 (((align_drift) - (alignment)) & ((alignment) - 1); \
50 })
51
52#endif /* _CTF_ALIGN_H */
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