nursery

performance.c
View Options

			#include <stdio.h>
			#include <stdlib.h>
			#include <time.h>
			#ifdef _WIN32
			#include <windows.h>
			#else
			#include <sys/time.h>
			#endif

			#include "ant.h"
			#include "runtime.h"
			#include "modules/symbol.h"
			#include "modules/performance.h"

			static double time_origin_ms = 0;

			static double get_current_time_ms(void) {
			#ifdef _WIN32
			LARGE_INTEGER freq, count;
			QueryPerformanceFrequency(&freq);
			QueryPerformanceCounter(&count);
			return (double)count.QuadPart * 1000.0 / (double)freq.QuadPart;
			#else
			struct timeval tv;
			gettimeofday(&tv, NULL);
			return (double)tv.tv_sec * 1000.0 + (double)tv.tv_usec / 1000.0;
			#endif
			}

			// performance.now()
			static jsval_t js_performance_now(struct js js, jsval_t args, int nargs) {
			(void) args; (void) nargs;
			double now = get_current_time_ms() - time_origin_ms;
			return js_mknum(now);
			}

			// performance.timeOrigin
			static jsval_t js_performance_time_origin(struct js js, jsval_t args, int nargs) {
			(void) args; (void) nargs;
			return js_mknum(time_origin_ms);
			}

			void init_performance_module() {
			struct js *js = rt->js;

			jsval_t glob = js_glob(js);
			jsval_t perf_obj = js_mkobj(js);

			time_origin_ms = get_current_time_ms();

			js_set(js, perf_obj, "now", js_mkfun(js_performance_now));
			js_set(js, perf_obj, "timeOrigin", js_mknum(time_origin_ms));

			js_set(js, perf_obj, get_toStringTag_sym_key(), ANT_STRING("Performance"));
			js_set(js, glob, "performance", perf_obj);
			}