Initial import

third_party/duktape/duk_bi_performance.c

@@ -0,0 +1,31 @@
+/*
+ *  High resolution time API (performance.now() et al)
+ *
+ *  API specification: https://encoding.spec.whatwg.org/#ap://www.w3.org/TR/hr-time/
+ */
+
+#include "third_party/duktape/duk_internal.h"
+
+#if defined(DUK_USE_PERFORMANCE_BUILTIN)
+DUK_INTERNAL duk_ret_t duk_bi_performance_now(duk_hthread *thr) {
+	/* From API spec:
+	 * The DOMHighResTimeStamp type is used to store a time value in
+	 * milliseconds, measured relative from the time origin, global
+	 * monotonic clock, or a time value that represents a duration
+	 * between two DOMHighResTimeStamp's.
+	 */
+	duk_push_number(thr, duk_time_get_monotonic_time(thr));
+	return 1;
+}
+
+#if 0  /* Missing until semantics decided. */
+DUK_INTERNAL duk_ret_t duk_bi_performance_timeorigin_getter(duk_hthread *thr) {
+	/* No decision yet how to handle timeOrigins, e.g. should one be
+	 * initialized per heap, or per global object set.  See
+	 * https://www.w3.org/TR/hr-time/#time-origin.
+	 */
+	duk_push_uint(thr, 0);
+	return 1;
+}
+#endif  /* 0 */
+#endif  /* DUK_USE_PERFORMANCE_BUILTIN */