profile: use specialized time__vpc_now

cmd/tools/preludes/profiled_program.v

@@ -3,5 +3,5 @@ module main
 import time
 
 const (
-	profiled_program_time_used = time.sys_mono_now()
+	profiled_program_time_used = time.seconds_per_minute
 )

vlib/time/time_darwin.c.v

@@ -10,31 +10,29 @@ const (
 
 [typedef]
 struct C.mach_timebase_info_data_t {
-	numer u64
-	denom u64
+	numer u32
+	denom u32
 }
 
 fn C.mach_absolute_time() u64
 fn C.mach_timebase_info(&C.mach_timebase_info_data_t)
+fn C.clock_gettime_nsec_np(int) u64
 
 struct InternalTimeBase {
-	numer u64
-	denom u64
+	numer u32 = 1
+	denom u32 = 1
 }
 
 fn init_time_base() InternalTimeBase {
-	mut tb := C.mach_timebase_info_data_t{}
+	tb := C.mach_timebase_info_data_t{}
 	C.mach_timebase_info(&tb)
 	return InternalTimeBase{numer:tb.numer, denom:tb.denom}
 }
 
 fn sys_mono_now_darwin() u64 {
 	tm := C.mach_absolute_time()
-	return mul_div(tm - start_time, time_base.numer, time_base.denom)
-}
-
-fn mul_div(val, numer, denom u64) u64 {
-	q := val / denom
-	r := val % denom
-	return q * numer + r * numer / denom
+	if time_base.denom == 0 {
+		C.mach_timebase_info(&time_base)
+	}
+	return (tm - start_time) * time_base.numer / time_base.denom
 }

vlib/time/time_nix.c.v

@@ -39,3 +39,19 @@ fn sys_mono_now() u64 {
 	}
 }
 
+// NB: vpc_now is used by `v -profile` .
+// It should NOT call *any other v function*, just C functions and casts.
+[inline]
+fn vpc_now() u64 {
+	$if macos {
+		tm := C.mach_absolute_time()
+		if time_base.denom == 0 {
+			C.mach_timebase_info(&time_base)
+		}
+		return (tm - start_time) * time_base.numer / time_base.denom
+	} $else {    
+		ts := C.timespec{}
+		C.clock_gettime(C.CLOCK_MONOTONIC, &ts)
+		return u64(ts.tv_sec) * 1_000_000_000 + u64(ts.tv_nsec)
+	}
+}

vlib/time/time_windows.c.v

@@ -12,48 +12,46 @@ struct C.tm {
 	tm_sec  int
 }
 
-[typedef]
-struct C.LARGE_INTEGER {
-	QuadPart i64
-}
 
 const (
 	// start_time is needed on Darwin and Windows because of potential overflows
-	// Windows: don't store the LARGE_INTEGER, just the QuadPart
 	start_time = init_win_time_start()
 	freq_time  = init_win_time_freq()
 )
 
 fn C._mkgmtime(&C.tm) time_t
 
-fn C.QueryPerformanceCounter(&C.LARGE_INTEGER) C.BOOL
+fn C.QueryPerformanceCounter(&u64) C.BOOL
 
-fn C.QueryPerformanceFrequency(&C.LARGE_INTEGER) C.BOOL
+fn C.QueryPerformanceFrequency(&u64) C.BOOL
 
 fn make_unix_time(t C.tm) int {
 	return int(C._mkgmtime(&t))
 }
 
 fn init_win_time_freq() u64 {
-	mut f := C.LARGE_INTEGER{}
-	_ := C.QueryPerformanceFrequency(&f)
-	return u64(f.QuadPart)
+	f := u64(0)
+	C.QueryPerformanceFrequency(&f)
+	return f
 }
 
 fn init_win_time_start() u64 {
-	mut s := C.LARGE_INTEGER{}
-	_ := C.QueryPerformanceCounter(&s)
-	return u64(s.QuadPart)
+	s := u64(0)
+	C.QueryPerformanceCounter(&s)
+	return s
 }
 
 fn sys_mono_now() u64 {
-	mut tm := C.LARGE_INTEGER{}
-	_ := C.QueryPerformanceCounter(&tm) // XP or later never fail
-	return mul_div(u64(tm.QuadPart) - start_time, 1_000_000_000, freq_time)
+	tm := u64(0)
+	C.QueryPerformanceCounter(&tm) // XP or later never fail
+	return (tm - start_time) * 1_000_000_000 / freq_time
 }
 
-fn mul_div(val, numer, denom u64) u64 {
-	q := val / denom
-	r := val % denom
-	return q * numer + r * numer / denom
+// NB: vpc_now is used by `v -profile` .
+// It should NOT call *any other v function*, just C functions and casts.
+[inline]
+fn vpc_now() u64 {
+	tm := u64(0)
+	C.QueryPerformanceCounter(&tm)
+	return tm
 }

vlib/v/gen/fn.v

@@ -109,14 +109,14 @@ fn (mut g Gen) gen_fn_decl(it ast.FnDecl) {
 			g.writeln('\tatexit(vprint_profile_stats);')
 			g.writeln('')
 		}
-		if it.name == 'time.sys_mono_now' {
+		if it.name == 'time.vpc_now' {
 			g.defer_profile_code = ''
 		} else {
 			fn_profile_counter_name := 'vpc_${g.last_fn_c_name}'
 			g.writeln('')
-			g.writeln('\tdouble _PROF_FN_START = time__sys_mono_now(); ${fn_profile_counter_name}_calls++; // $it.name')
+			g.writeln('\tdouble _PROF_FN_START = time__vpc_now(); ${fn_profile_counter_name}_calls++; // $it.name')
 			g.writeln('')
-			g.defer_profile_code = '\t${fn_profile_counter_name} += time__sys_mono_now() - _PROF_FN_START;'
+			g.defer_profile_code = '\t${fn_profile_counter_name} += time__vpc_now() - _PROF_FN_START;'
 			g.pcs_declarations.writeln('double ${fn_profile_counter_name} = 0.0; u64 ${fn_profile_counter_name}_calls = 0;')
 			g.pcs[g.last_fn_c_name] = fn_profile_counter_name
 		}