performance.c
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performance.c
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	#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);
	}