* All other timestamps are calculated as the wall clock time at last sync + elapsed time since.
 * <p>
 * This clock deals relatively well when the system wall clock shift is adjusted by small amounts.
 * It also deals relatively well when the system wall clock jumps forward by large amounts (this clock will jump with it).
 * It does not deal as well with large jumps back in time.
 * <p>

	if err := checkCompilerFlags("TEST", "test", []string{"-Wall"}); err != nil {
		t.Fatalf("unexpected error for -Wall: %v", err)
	}
	os.Setenv("CGO_TEST_DISALLOW", "-Wall")
	if err := checkCompilerFlags("TEST", "test", []string{"-Wall"}); err == nil {
		t.Fatalf("missing error for -Wall with CGO_TEST_DISALLOW=-Wall")
	}
	os.Setenv("CGO_TEST_ALLOW", "-Wall") // disallow wins

// clock reading.
type Time struct {
	// wall and ext encode the wall time seconds, wall time nanoseconds,
	// and optional monotonic clock reading in nanoseconds.
	//
	// From high to low bit position, wall encodes a 1-bit flag (hasMonotonic),
	// a 33-bit seconds field, and a 30-bit wall time nanoseconds field.
	// The nanoseconds field is in the range [0, 999999999].

	defer t.Stop()

	// If this test fails, we will either throw (when siftdownTimer detects
	// bad when on update), or other timers will hang (if the timer in a
	// heap is in a bad state). There is no reliable way to test this, but
	// we wait on a short timer here as a smoke test (alternatively, timers
	// in later tests may hang).
	<-After(25 * Millisecond)
}

var (
	MinMonoTime = Time{wall: 1 << 63, ext: -1 << 63, loc: UTC}

	MULA	R1, R2, R4, R4

	// wintime*100 = R4:R3
	MOVW	R3, mono+12(FP)
	MOVW	R4, mono+16(FP)

	MOVW	$_SYSTEM_TIME, R3
wall:
	MOVW	time_hi1(R3), R1
	DMB	MB_ISH
	MOVW	time_lo(R3), R0
	DMB	MB_ISH
	MOVW	time_hi2(R3), R2
	CMP	R1, R2
	BNE	wall

	// w = R1:R0 in 100ns untis
	// convert to Unix epoch (but still 100ns units)
	#define delta 116444736000000000
	SUB.S   $(delta & 0xFFFFFFFF), R0

// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package issue43639

// #cgo CFLAGS: -W -Wall -Werror

	// multiply by 100
	MOVL	$100, AX
	MULL	CX
	IMULL	$100, DI
	ADDL	DI, DX
	// w*100 = DX:AX
	MOVL	AX, mono+12(FP)
	MOVL	DX, mono+16(FP)

wall:
	MOVL	(_SYSTEM_TIME+time_hi1), CX
	MOVL	(_SYSTEM_TIME+time_lo), AX
	MOVL	(_SYSTEM_TIME+time_hi2), DX
	CMPL	CX, DX
	JNE	wall

	// w = DX:AX
	// convert to Unix epoch (but still 100ns units)
	#define delta 116444736000000000
	SUBL	$(delta & 0xFFFFFFFF), AX

	}

	t3 := tm.Add(-9e18) // wall now out of range
	if t3.Nanosecond() != 123456 {
		t.Errorf("t3.Nanosecond() = %d, want 123456", t3.Nanosecond())
	}
	if GetMono(&t3) != 0 {
		t.Errorf("t3.mono = %d, want 0 (wall time out of range for monotonic reading)", GetMono(&t3))
	}

	t4 := tm.Add(+9e18) // wall now out of range
	if t4.Nanosecond() != 123456 {

#cgo aix LDFLAGS: -Wl,-berok
#cgo solaris LDFLAGS: -lxnet
#cgo solaris LDFLAGS: -lsocket

// Use -fno-stack-protector to avoid problems locating the
// proper support functions. See issues #52919, #54313, #58385.
#cgo CFLAGS: -Wall -Werror -fno-stack-protector

#cgo solaris CPPFLAGS: -D_POSIX_PTHREAD_SEMANTICS

*/
import "C"

import "runtime/internal/sys"

// Incomplete is used specifically for the semantics of incomplete C types.

 *
 * The provider is _required_ to provide monotonic timestamps.
 *
 * @since 4.2
 */
@ServiceScope(Scope.BuildTree.class)
public interface BuildScanClock {

    /**
     * The current wall clock time.
     */
    long getCurrentTime();