#include <babeltrace/compat/uuid-internal.h>
#include <babeltrace/types.h>
#include <babeltrace/property-internal.h>
+#include <babeltrace/assert-internal.h>
#include <stdbool.h>
#include <stdint.h>
#include <glib.h>
+#define NS_PER_S_I INT64_C(1000000000)
+#define NS_PER_S_U UINT64_C(1000000000)
+
struct bt_clock_class {
struct bt_object base;
bt_uuid value;
} uuid;
- bool is_absolute;
+ bool origin_is_unix_epoch;
/*
* This is computed every time you call
BT_HIDDEN
bt_bool bt_clock_class_is_valid(struct bt_clock_class *clock_class);
+static inline
+int bt_clock_class_clock_value_from_ns_from_origin(
+ struct bt_clock_class *cc, int64_t ns_from_origin,
+ uint64_t *raw_value)
+{
+ int ret = 0;
+ int64_t offset_in_ns;
+ uint64_t value_in_ns;
+ uint64_t rem_value_in_ns;
+ uint64_t value_periods;
+ uint64_t value_period_cycles;
+ int64_t ns_to_add;
+
+ BT_ASSERT(cc);
+ BT_ASSERT(raw_value);
+
+ /* Compute offset part of requested value, in nanoseconds */
+ if (!bt_safe_to_mul_int64(cc->offset_seconds, NS_PER_S_I)) {
+ ret = -1;
+ goto end;
+ }
+
+ offset_in_ns = cc->offset_seconds * NS_PER_S_I;
+
+ if (cc->frequency == NS_PER_S_U) {
+ ns_to_add = (int64_t) cc->offset_cycles;
+ } else {
+ if (!bt_safe_to_mul_int64((int64_t) cc->offset_cycles,
+ NS_PER_S_I)) {
+ ret = -1;
+ goto end;
+ }
+
+ ns_to_add = ((int64_t) cc->offset_cycles * NS_PER_S_I) /
+ (int64_t) cc->frequency;
+ }
+
+ if (!bt_safe_to_add_int64(offset_in_ns, ns_to_add)) {
+ ret = -1;
+ goto end;
+ }
+
+ offset_in_ns += ns_to_add;
+
+ /* Value part in nanoseconds */
+ if (ns_from_origin < offset_in_ns) {
+ ret = -1;
+ goto end;
+ }
+
+ value_in_ns = (uint64_t) (ns_from_origin - offset_in_ns);
+
+ /* Number of whole clock periods in `value_in_ns` */
+ value_periods = value_in_ns / NS_PER_S_U;
+
+ /* Remaining nanoseconds in cycles + whole clock periods in cycles */
+ rem_value_in_ns = value_in_ns - value_periods * NS_PER_S_U;
+
+ if (value_periods > UINT64_MAX / cc->frequency) {
+ ret = -1;
+ goto end;
+ }
+
+ if (!bt_safe_to_mul_uint64(value_periods, cc->frequency)) {
+ ret = -1;
+ goto end;
+ }
+
+ value_period_cycles = value_periods * cc->frequency;
+
+ if (!bt_safe_to_mul_uint64(cc->frequency, rem_value_in_ns)) {
+ ret = -1;
+ goto end;
+ }
+
+ if (!bt_safe_to_add_uint64(cc->frequency * rem_value_in_ns / NS_PER_S_U,
+ value_period_cycles)) {
+ ret = -1;
+ goto end;
+ }
+
+ *raw_value = cc->frequency * rem_value_in_ns / NS_PER_S_U +
+ value_period_cycles;
+
+end:
+ return ret;
+}
+
#endif /* BABELTRACE_TRACE_IR_CLOCK_CLASS_INTERNAL_H */