| 1 | #ifndef BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H |
| 2 | #define BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com> |
| 6 | * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 7 | * |
| 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: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 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 |
| 24 | * SOFTWARE. |
| 25 | */ |
| 26 | |
| 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> |
| 35 | #include <stdbool.h> |
| 36 | #include <stdint.h> |
| 37 | #include <glib.h> |
| 38 | |
| 39 | #define NS_PER_S_I INT64_C(1000000000) |
| 40 | #define NS_PER_S_U UINT64_C(1000000000) |
| 41 | |
| 42 | struct bt_clock_class { |
| 43 | struct bt_object base; |
| 44 | |
| 45 | struct { |
| 46 | GString *str; |
| 47 | |
| 48 | /* NULL or `str->str` above */ |
| 49 | const char *value; |
| 50 | } name; |
| 51 | |
| 52 | struct { |
| 53 | GString *str; |
| 54 | |
| 55 | /* NULL or `str->str` above */ |
| 56 | const char *value; |
| 57 | } description; |
| 58 | |
| 59 | uint64_t frequency; |
| 60 | uint64_t precision; |
| 61 | int64_t offset_seconds; |
| 62 | uint64_t offset_cycles; |
| 63 | |
| 64 | struct { |
| 65 | uint8_t uuid[BABELTRACE_UUID_LEN]; |
| 66 | |
| 67 | /* NULL or `uuid` above */ |
| 68 | bt_uuid value; |
| 69 | } uuid; |
| 70 | |
| 71 | bool origin_is_unix_epoch; |
| 72 | |
| 73 | /* |
| 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(). |
| 82 | * |
| 83 | * `overflows` is true if the base offset cannot be computed |
| 84 | * because of an overflow. |
| 85 | */ |
| 86 | struct { |
| 87 | int64_t value_ns; |
| 88 | bool overflows; |
| 89 | } base_offset; |
| 90 | |
| 91 | /* Pool of `struct bt_clock_snapshot *` */ |
| 92 | struct bt_object_pool cs_pool; |
| 93 | |
| 94 | bool frozen; |
| 95 | }; |
| 96 | |
| 97 | BT_HIDDEN |
| 98 | void _bt_clock_class_freeze(const struct bt_clock_class *clock_class); |
| 99 | |
| 100 | #ifdef BT_DEV_MODE |
| 101 | # define bt_clock_class_freeze _bt_clock_class_freeze |
| 102 | #else |
| 103 | # define bt_clock_class_freeze(_cc) |
| 104 | #endif |
| 105 | |
| 106 | BT_HIDDEN |
| 107 | bt_bool bt_clock_class_is_valid(struct bt_clock_class *clock_class); |
| 108 | |
| 109 | static inline |
| 110 | int bt_clock_class_clock_value_from_ns_from_origin( |
| 111 | struct bt_clock_class *cc, int64_t ns_from_origin, |
| 112 | uint64_t *raw_value) |
| 113 | { |
| 114 | int ret = 0; |
| 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; |
| 120 | int64_t ns_to_add; |
| 121 | |
| 122 | BT_ASSERT(cc); |
| 123 | BT_ASSERT(raw_value); |
| 124 | |
| 125 | /* Compute offset part of requested value, in nanoseconds */ |
| 126 | if (!bt_safe_to_mul_int64(cc->offset_seconds, NS_PER_S_I)) { |
| 127 | ret = -1; |
| 128 | goto end; |
| 129 | } |
| 130 | |
| 131 | offset_in_ns = cc->offset_seconds * NS_PER_S_I; |
| 132 | |
| 133 | if (cc->frequency == NS_PER_S_U) { |
| 134 | ns_to_add = (int64_t) cc->offset_cycles; |
| 135 | } else { |
| 136 | if (!bt_safe_to_mul_int64((int64_t) cc->offset_cycles, |
| 137 | NS_PER_S_I)) { |
| 138 | ret = -1; |
| 139 | goto end; |
| 140 | } |
| 141 | |
| 142 | ns_to_add = ((int64_t) cc->offset_cycles * NS_PER_S_I) / |
| 143 | (int64_t) cc->frequency; |
| 144 | } |
| 145 | |
| 146 | if (!bt_safe_to_add_int64(offset_in_ns, ns_to_add)) { |
| 147 | ret = -1; |
| 148 | goto end; |
| 149 | } |
| 150 | |
| 151 | offset_in_ns += ns_to_add; |
| 152 | |
| 153 | /* Value part in nanoseconds */ |
| 154 | if (ns_from_origin < offset_in_ns) { |
| 155 | ret = -1; |
| 156 | goto end; |
| 157 | } |
| 158 | |
| 159 | value_in_ns = (uint64_t) (ns_from_origin - offset_in_ns); |
| 160 | |
| 161 | /* Number of whole clock periods in `value_in_ns` */ |
| 162 | value_periods = value_in_ns / NS_PER_S_U; |
| 163 | |
| 164 | /* Remaining nanoseconds in cycles + whole clock periods in cycles */ |
| 165 | rem_value_in_ns = value_in_ns - value_periods * NS_PER_S_U; |
| 166 | |
| 167 | if (value_periods > UINT64_MAX / cc->frequency) { |
| 168 | ret = -1; |
| 169 | goto end; |
| 170 | } |
| 171 | |
| 172 | if (!bt_safe_to_mul_uint64(value_periods, cc->frequency)) { |
| 173 | ret = -1; |
| 174 | goto end; |
| 175 | } |
| 176 | |
| 177 | value_period_cycles = value_periods * cc->frequency; |
| 178 | |
| 179 | if (!bt_safe_to_mul_uint64(cc->frequency, rem_value_in_ns)) { |
| 180 | ret = -1; |
| 181 | goto end; |
| 182 | } |
| 183 | |
| 184 | if (!bt_safe_to_add_uint64(cc->frequency * rem_value_in_ns / NS_PER_S_U, |
| 185 | value_period_cycles)) { |
| 186 | ret = -1; |
| 187 | goto end; |
| 188 | } |
| 189 | |
| 190 | *raw_value = cc->frequency * rem_value_in_ns / NS_PER_S_U + |
| 191 | value_period_cycles; |
| 192 | |
| 193 | end: |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | #endif /* BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H */ |