}
};
+#define NS_PER_S_I INT64_C(1000000000)
+#define NS_PER_S_U UINT64_C(1000000000)
+
+static inline
+int bt_common_clock_value_from_ns_from_origin(
+ int64_t cc_offset_seconds, uint64_t cc_offset_cycles,
+ uint64_t cc_freq, 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(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_freq == 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_freq;
+ }
+
+ 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_freq) {
+ ret = -1;
+ goto end;
+ }
+
+ if (!bt_safe_to_mul_uint64(value_periods, cc_freq)) {
+ ret = -1;
+ goto end;
+ }
+
+ value_period_cycles = value_periods * cc_freq;
+
+ if (!bt_safe_to_mul_uint64(cc_freq, rem_value_in_ns)) {
+ ret = -1;
+ goto end;
+ }
+
+ if (!bt_safe_to_add_uint64(cc_freq * rem_value_in_ns / NS_PER_S_U,
+ value_period_cycles)) {
+ ret = -1;
+ goto end;
+ }
+
+ *raw_value = cc_freq * rem_value_in_ns / NS_PER_S_U +
+ value_period_cycles;
+
+end:
+ return ret;
+}
+
#endif /* BABELTRACE_COMMON_INTERNAL_H */