* SOFTWARE.
*/
+#include <babeltrace/babeltrace-internal.h>
#include <babeltrace/object-internal.h>
+#include <babeltrace/ctf-ir/clock-class-internal.h>
#include <stdbool.h>
#include <stdint.h>
uint64_t value;
bool ns_from_epoch_overflows;
int64_t ns_from_epoch;
+ bool is_set;
+ bool frozen;
};
+static inline
+void bt_clock_value_set(struct bt_clock_value *clock_value)
+{
+ BT_ASSERT(clock_value);
+ clock_value->is_set = true;
+}
+
+static inline
+void bt_clock_value_reset(struct bt_clock_value *clock_value)
+{
+ BT_ASSERT(clock_value);
+ clock_value->is_set = false;
+}
+
+BT_UNUSED
+static inline
+void _bt_clock_value_set_is_frozen(struct bt_clock_value *clock_value,
+ bool is_frozen)
+{
+ BT_ASSERT(clock_value);
+ clock_value->frozen = is_frozen;
+}
+
+static inline
+uint64_t ns_from_value(uint64_t frequency, uint64_t value)
+{
+ uint64_t ns;
+
+ if (frequency == UINT64_C(1000000000)) {
+ ns = value;
+ } else {
+ double dblres = ((1e9 * (double) value) / (double) frequency);
+
+ if (dblres >= (double) UINT64_MAX) {
+ /* Overflows uint64_t */
+ ns = -1ULL;
+ } else {
+ ns = (uint64_t) dblres;
+ }
+ }
+
+ return ns;
+}
+
+static inline
+int ns_from_epoch(struct bt_clock_class *clock_class, uint64_t value,
+ int64_t *ns_from_epoch, bool *overflows)
+{
+ int ret = 0;
+ int64_t diff;
+ int64_t s_ns;
+ uint64_t u_ns;
+ uint64_t cycles;
+
+ *overflows = false;
+
+ /* Initialize nanosecond timestamp to clock's offset in seconds */
+ if (clock_class->offset_s <= (INT64_MIN / INT64_C(1000000000)) ||
+ clock_class->offset_s >= (INT64_MAX / INT64_C(1000000000))) {
+ /*
+ * Overflow: offset in seconds converted to nanoseconds
+ * is outside the int64_t range.
+ */
+ *overflows = true;
+ goto end;
+ }
+
+ *ns_from_epoch = clock_class->offset_s * INT64_C(1000000000);
+
+ /* Add offset in cycles */
+ if (clock_class->offset < 0) {
+ cycles = (uint64_t) -clock_class->offset;
+ } else {
+ cycles = (uint64_t) clock_class->offset;
+ }
+
+ u_ns = ns_from_value(clock_class->frequency, cycles);
+
+ if (u_ns == UINT64_C(-1) || u_ns >= INT64_MAX) {
+ /*
+ * Overflow: offset in cycles converted to nanoseconds
+ * is outside the int64_t range.
+ */
+ *overflows = true;
+ goto end;
+ }
+
+ s_ns = (int64_t) u_ns;
+ BT_ASSERT(s_ns >= 0);
+
+ if (clock_class->offset < 0) {
+ if (*ns_from_epoch >= 0) {
+ /*
+ * Offset in cycles is negative so it must also
+ * be negative once converted to nanoseconds.
+ */
+ s_ns = -s_ns;
+ goto offset_ok;
+ }
+
+ diff = *ns_from_epoch - INT64_MIN;
+
+ if (s_ns >= diff) {
+ /*
+ * Overflow: current timestamp in nanoseconds
+ * plus the offset in cycles converted to
+ * nanoseconds is outside the int64_t range.
+ */
+ *overflows = true;
+ goto end;
+ }
+
+ /*
+ * Offset in cycles is negative so it must also be
+ * negative once converted to nanoseconds.
+ */
+ s_ns = -s_ns;
+ } else {
+ if (*ns_from_epoch <= 0) {
+ goto offset_ok;
+ }
+
+ diff = INT64_MAX - *ns_from_epoch;
+
+ if (s_ns >= diff) {
+ /*
+ * Overflow: current timestamp in nanoseconds
+ * plus the offset in cycles converted to
+ * nanoseconds is outside the int64_t range.
+ */
+ *overflows = true;
+ goto end;
+ }
+ }
+
+offset_ok:
+ *ns_from_epoch += s_ns;
+
+ /* Add clock value (cycles) */
+ u_ns = ns_from_value(clock_class->frequency, value);
+
+ if (u_ns == -1ULL || u_ns >= INT64_MAX) {
+ /*
+ * Overflow: value converted to nanoseconds is outside
+ * the int64_t range.
+ */
+ *overflows = true;
+ goto end;
+ }
+
+ s_ns = (int64_t) u_ns;
+ BT_ASSERT(s_ns >= 0);
+
+ /* Clock value (cycles) is always positive */
+ if (*ns_from_epoch <= 0) {
+ goto value_ok;
+ }
+
+ diff = INT64_MAX - *ns_from_epoch;
+
+ if (s_ns >= diff) {
+ /*
+ * Overflow: current timestamp in nanoseconds plus the
+ * clock value converted to nanoseconds is outside the
+ * int64_t range.
+ */
+ *overflows = true;
+ goto end;
+ }
+
+value_ok:
+ *ns_from_epoch += s_ns;
+
+end:
+ if (*overflows) {
+ *ns_from_epoch = 0;
+ ret = -1;
+ }
+
+ return ret;
+}
+
+static inline
+void set_ns_from_epoch(struct bt_clock_value *clock_value)
+{
+ (void) ns_from_epoch(clock_value->clock_class,
+ clock_value->value, &clock_value->ns_from_epoch,
+ &clock_value->ns_from_epoch_overflows);
+}
+
+static inline
+void bt_clock_value_set_raw_value(struct bt_clock_value *clock_value,
+ uint64_t cycles)
+{
+ BT_ASSERT(clock_value);
+
+ clock_value->value = cycles;
+ set_ns_from_epoch(clock_value);
+ bt_clock_value_set(clock_value);
+}
+
+static inline
+int bt_clock_value_set_value_inline(struct bt_clock_value *clock_value,
+ uint64_t raw_value)
+{
+#ifdef BT_ASSERT_PRE_NON_NULL
+ BT_ASSERT_PRE_NON_NULL(clock_value, "Clock value");
+#endif
+
+#ifdef BT_ASSERT_PRE_HOT
+ BT_ASSERT_PRE_HOT(clock_value, "Clock value", ": %!+k", clock_value);
+#endif
+
+ bt_clock_value_set_raw_value(clock_value, raw_value);
+ return 0;
+}
+
+#ifdef BT_DEV_MODE
+# define bt_clock_value_set_is_frozen _bt_clock_value_set_is_frozen
+#else
+# define bt_clock_value_set_is_frozen(_x, _f)
+#endif /* BT_DEV_MODE */
+
+BT_HIDDEN
+struct bt_clock_value *bt_clock_value_create(
+ struct bt_clock_class *clock_class);
+
+BT_HIDDEN
+void bt_clock_value_recycle(struct bt_clock_value *clock_value);
+
+BT_HIDDEN
+void bt_clock_value_set_raw_value(struct bt_clock_value *clock_value,
+ uint64_t cycles);
+
#endif /* BABELTRACE_CTF_IR_CLOCK_VALUE_INTERNAL_H */
projects / babeltrace.git / blobdiff