src/common: use single Makefile for parallel builds
[lttng-tools.git] / src / common / align.h
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953192ba 1/*
ab5be9fa 2 * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
953192ba 3 *
ab5be9fa 4 * SPDX-License-Identifier: MIT
953192ba 5 *
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6 */
7
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8#ifndef _LTTNG_ALIGN_H
9#define _LTTNG_ALIGN_H
10
8564ccbd 11#include "bug.h"
d575a7f8 12
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13/*
14 * Align value to the next multiple of align. Returns val if it already is a
15 * multiple of align. Align must be a power of two.
16 */
17#define __lttng_align_ceil_mask(v, mask) (((v) + (mask)) & ~(mask))
d575a7f8 18
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19#define lttng_align_ceil(v, align) \
20 __lttng_align_ceil_mask(v, (__typeof__(v)) (align) - 1)
d4ad24a3 21
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22/*
23 * Align value to the previous multiple of align. Returns val if it already is a
24 * multiple of align. Align must be a power of two.
25 */
26#define __lttng_align_floor_mask(v, mask) ((v) & ~(mask))
d4ad24a3 27
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28#define lttng_align_floor(v, align) \
29 __lttng_align_floor_mask(v, (__typeof__(v)) (align) - 1)
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30
31/**
1cbd136b 32 * lttng_offset_align - Calculate the offset needed to align an object on its natural
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33 * alignment towards higher addresses.
34 * @align_drift: object offset from an "alignment"-aligned address.
35 * @alignment: natural object alignment. Must be non-zero, power of 2.
36 *
37 * Returns the offset that must be added to align towards higher
38 * addresses.
39 */
1cbd136b 40#define lttng_offset_align(align_drift, alignment) \
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41 ({ \
42 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
43 || ((alignment) & ((alignment) - 1))); \
44 (((alignment) - (align_drift)) & ((alignment) - 1)); \
45 })
46
47/**
1cbd136b 48 * lttng_offset_align_floor - Calculate the offset needed to align an object
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49 * on its natural alignment towards lower addresses.
50 * @align_drift: object offset from an "alignment"-aligned address.
51 * @alignment: natural object alignment. Must be non-zero, power of 2.
52 *
53 * Returns the offset that must be substracted to align towards lower addresses.
54 */
1cbd136b 55#define lttng_offset_align_floor(align_drift, alignment) \
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56 ({ \
57 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
58 || ((alignment) & ((alignment) - 1))); \
d07ceecd 59 (((align_drift) - (alignment)) & ((alignment) - 1)); \
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60 })
61
62#endif /* _LTTNG_ALIGN_H */
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