for _, fn := range v.funcs {
		if err := f(fn.PkgIdx, fn.FuncIdx, fn.Counters); err != nil {
			return err
		}
	}
	return nil
}

func mkfunc(p uint32, f uint32, c []uint32) decodecounter.FuncPayload {
	return decodecounter.FuncPayload{
		PkgIdx:   p,
		FuncIdx:  f,
		Counters: c,
	}
}

func TestCounterDataWriterReader(t *testing.T) {

}

func (s *sstate) VisitFuncCounterData(data decodecounter.FuncPayload) {
	key := pkfunc{pk: data.PkgIdx, fcn: data.FuncIdx}

	if *verbflag >= 5 {
		fmt.Printf("ctr visit fid=%d pk=%d inidx=%d data.Counters=%+v\n", data.FuncIdx, data.PkgIdx, s.inidx, data.Counters)
	}

	// If we're processing counter data from the initial (first) input

				return fmt.Errorf("reading counter data file %s: %v", cdf, err)
			}
			if !ok {
				break
			}

			// NB: sanity check on pkg and func IDs?
			key := pkfunc{pk: data.PkgIdx, fcn: data.FuncIdx}
			if prev, found := pmm[key]; found {
				// Note: no overflow reporting here.
				if err, _ := ts.cm.MergeCounters(data.Counters, prev); err != nil {
					return fmt.Errorf("processing counter data file %s: %v", cdf, err)