1 #ifndef BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H
2 #define BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H
5 * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
6 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 #include <babeltrace/trace-ir/clock-class.h>
28 #include <babeltrace/object-internal.h>
29 #include <babeltrace/babeltrace-internal.h>
30 #include <babeltrace/object-pool-internal.h>
31 #include <babeltrace/compat/uuid-internal.h>
32 #include <babeltrace/types.h>
33 #include <babeltrace/property-internal.h>
34 #include <babeltrace/assert-internal.h>
39 #define NS_PER_S_I INT64_C(1000000000)
40 #define NS_PER_S_U UINT64_C(1000000000)
42 struct bt_clock_class
{
43 struct bt_object base
;
48 /* NULL or `str->str` above */
55 /* NULL or `str->str` above */
61 int64_t offset_seconds
;
62 uint64_t offset_cycles
;
65 uint8_t uuid
[BABELTRACE_UUID_LEN
];
67 /* NULL or `uuid` above */
71 bool origin_is_unix_epoch
;
74 * This is computed every time you call
75 * bt_clock_class_set_frequency() or
76 * bt_clock_class_set_offset(), as well as initially. It is the
77 * base offset in nanoseconds including both `offset_seconds`
78 * and `offset_cycles` above in the result. It is used to
79 * accelerate future calls to
80 * bt_clock_snapshot_get_ns_from_origin() and
81 * bt_clock_class_cycles_to_ns_from_origin().
83 * `overflows` is true if the base offset cannot be computed
84 * because of an overflow.
91 /* Pool of `struct bt_clock_snapshot *` */
92 struct bt_object_pool cs_pool
;
98 void _bt_clock_class_freeze(const struct bt_clock_class
*clock_class
);
101 # define bt_clock_class_freeze _bt_clock_class_freeze
103 # define bt_clock_class_freeze(_cc)
107 bt_bool
bt_clock_class_is_valid(struct bt_clock_class
*clock_class
);
110 int bt_clock_class_clock_value_from_ns_from_origin(
111 struct bt_clock_class
*cc
, int64_t ns_from_origin
,
115 int64_t offset_in_ns
;
116 uint64_t value_in_ns
;
117 uint64_t rem_value_in_ns
;
118 uint64_t value_periods
;
119 uint64_t value_period_cycles
;
123 BT_ASSERT(raw_value
);
125 /* Compute offset part of requested value, in nanoseconds */
126 if (!bt_safe_to_mul_int64(cc
->offset_seconds
, NS_PER_S_I
)) {
131 offset_in_ns
= cc
->offset_seconds
* NS_PER_S_I
;
133 if (cc
->frequency
== NS_PER_S_U
) {
134 ns_to_add
= (int64_t) cc
->offset_cycles
;
136 if (!bt_safe_to_mul_int64((int64_t) cc
->offset_cycles
,
142 ns_to_add
= ((int64_t) cc
->offset_cycles
* NS_PER_S_I
) /
143 (int64_t) cc
->frequency
;
146 if (!bt_safe_to_add_int64(offset_in_ns
, ns_to_add
)) {
151 offset_in_ns
+= ns_to_add
;
153 /* Value part in nanoseconds */
154 if (ns_from_origin
< offset_in_ns
) {
159 value_in_ns
= (uint64_t) (ns_from_origin
- offset_in_ns
);
161 /* Number of whole clock periods in `value_in_ns` */
162 value_periods
= value_in_ns
/ NS_PER_S_U
;
164 /* Remaining nanoseconds in cycles + whole clock periods in cycles */
165 rem_value_in_ns
= value_in_ns
- value_periods
* NS_PER_S_U
;
167 if (value_periods
> UINT64_MAX
/ cc
->frequency
) {
172 if (!bt_safe_to_mul_uint64(value_periods
, cc
->frequency
)) {
177 value_period_cycles
= value_periods
* cc
->frequency
;
179 if (!bt_safe_to_mul_uint64(cc
->frequency
, rem_value_in_ns
)) {
184 if (!bt_safe_to_add_uint64(cc
->frequency
* rem_value_in_ns
/ NS_PER_S_U
,
185 value_period_cycles
)) {
190 *raw_value
= cc
->frequency
* rem_value_in_ns
/ NS_PER_S_U
+
197 #endif /* BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H */
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