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
	}

		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
}

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
}

// 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: '?'}

package mountinfo

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"syscall"
)

const (
	// Number of fields per line in /proc/mounts as per the fstab man page.
	expectedNumFieldsPerLine = 6
	// Location of the mount file to use
	procMountsPath = "/proc/mounts"
)

// IsLikelyMountPoint determines if a directory is a mountpoint.