}
		if strings.HasPrefix(s.Name, counterPrefix) {
			ckTypSanity(nm, "countervar")
			nm.SetCoverageAuxVar(true)
			s := nm.Linksym()
			s.Type = objabi.SCOVERAGE_COUNTER
		}
	}
	cm := coverage.ParseCounterMode(counterMode)
	if cm == coverage.CtrModeInvalid {
		base.Fatalf("bad setting %q for covermode in coveragecfg:",
			counterMode)
	}
	var cg coverage.CounterGranularity
	switch counterGran {
	case "perblock":

// intended to be used other than internally by the Go command's
// generated code.
func ProcessCoverTestDir(dir string, cfile string, cm string, cpkg string, w io.Writer) error {
	cmode := coverage.ParseCounterMode(cm)
	if cmode == coverage.CtrModeInvalid {
		return fmt.Errorf("invalid counter mode %q", cm)
	}

	// Emit meta-data and counter data.
	ml := rtcov.Meta.List
	if len(ml) == 0 {

		return "count"
	case CtrModeAtomic:
		return "atomic"
	case CtrModeRegOnly:
		return "regonly"
	case CtrModeTestMain:
		return "testmain"
	}
	return "<invalid>"
}

func ParseCounterMode(mode string) CounterMode {
	var cm CounterMode
	switch mode {
	case "set":
		cm = CtrModeSet
	case "count":
		cm = CtrModeCount
	case "atomic":
		cm = CtrModeAtomic
	case "regonly":