func (cfw *CoverageDataWriter) AppendSegment(args map[string]string, visitor CounterVisitor) error {
	cfw.stab = &stringtab.Writer{}
	cfw.stab.InitWriter()
	cfw.stab.Lookup("")

	var err error
	for k, v := range args {
		cfw.stab.Lookup(k)
		cfw.stab.Lookup(v)
	}

	ws := &slicewriter.WriteSeeker{}
	if err = cfw.writeSegmentPreamble(args, ws); err != nil {
		return err
	}

type CoverageMetaFileWriter struct {
	stab   stringtab.Writer
	mfname string
	w      *bufio.Writer
	tmp    []byte
	debug  bool
}

func NewCoverageMetaFileWriter(mfname string, w io.Writer) *CoverageMetaFileWriter {
	r := &CoverageMetaFileWriter{
		mfname: mfname,
		w:      bufio.NewWriter(w),
		tmp:    make([]byte, 64),
	}
	r.stab.InitWriter()
	r.stab.Lookup("")
	return r
}

		return nil, fmt.Errorf("invalid empty package path")
	}
	x := &CoverageMetaDataBuilder{
		tmp: make([]byte, 0, 256),
		h:   md5.New(),
	}
	x.stab.InitWriter()
	x.stab.Lookup("")
	x.pkgpath = x.stab.Lookup(pkgpath)
	x.pkgname = x.stab.Lookup(pkgname)
	x.modpath = x.stab.Lookup(modulepath)
	io.WriteString(x.h, pkgpath)
	io.WriteString(x.h, pkgname)
	io.WriteString(x.h, modulepath)
	return x, nil
}

// counter-data files.

// Writer implements a string table writing utility.
type Writer struct {
	stab   map[string]uint32
	strs   []string
	tmp    []byte
	frozen bool
}

// InitWriter initializes a stringtab.Writer.
func (stw *Writer) InitWriter() {
	stw.stab = make(map[string]uint32)
	stw.tmp = make([]byte, 64)
}

// Nentries returns the number of strings interned so far.

	var addrs []uint64
	for _, s := range f.macho.Symtab.Syms {
		// Skip stab debug info.
		if s.Type&stabTypeMask == 0 {
			addrs = append(addrs, s.Value)
		}
	}
	sort.Sort(uint64s(addrs))

	var syms []Sym
	for _, s := range f.macho.Symtab.Syms {
		if s.Type&stabTypeMask != 0 {
			// Skip stab debug info.
			continue
		}
		sym := Sym{Name: s.Name, Addr: s.Value, Code: '?'}

		return err
	}
	if nr != int(cdr.shdr.StrTabLen) {
		return fmt.Errorf("error: short read on string table")
	}
	slr := slicereader.NewReader(b, false /* not readonly */)
	cdr.stab = stringtab.NewReader(slr)
	cdr.stab.Read()
	return nil
}

func (cdr *CounterDataReader) readArgs() error {
	b := make([]byte, cdr.shdr.ArgsLen)
	nr, err := cdr.mr.Read(b)
	if err != nil {
		return err
	}

			}
			if _, err := os.Stat(shlibname); err == nil {
				return addlibpath(ctxt, "internal", "internal", "", name, shlibname, zerofp)
			}
		}
		pname := filepath.Join(libdir, name+".a")
		if ctxt.Debugvlog != 0 {
			ctxt.Logf("searching for %s.a in %s\n", name, pname)
		}
		if _, err := os.Stat(pname); err == nil {

		return
	}

	// TODO: This causes allocations, but escape analysis doesn't really show the cause.
	// If another faithful engineer wants to take a stab, feel free.
	go func(m message) {
		var start time.Time
		if m.DeadlineMS > 0 {
			start = time.Now()
		}
		var b []byte
		var err *RemoteErr
		func() {
			defer func() {

	// array and then call "f" on it.
	for pidx, p := range mm.pkgs {
		fids := make([]int, 0, len(p.ctab))
		for fid := range p.ctab {
			fids = append(fids, int(fid))
		}
		sort.Ints(fids)
		if *verbflag >= 4 {
			fmt.Printf("fids for pk=%d: %+v\n", pidx, fids)
		}
		for _, fid := range fids {
			fp := p.ctab[uint32(fid)]
			if *verbflag >= 4 {

apiVersion: release-notes/v2
kind: feature
area: networking
releaseNotes:
- |