return u.asize
}

func (d *Data) parseUnits() ([]unit, error) {
	// Count units.
	nunit := 0
	b := makeBuf(d, unknownFormat{}, "info", 0, d.info)
	for len(b.data) > 0 {
		len, _ := b.unitLength()
		if len != Offset(uint32(len)) {
			b.error("unit length overflow")
			break
		}
		b.skip(int(len))
		if len > 0 {
			nunit++
		}
	}
	if b.err != nil {
		return nil, b.err
	}

}

// Parse a .debug_types section.
func (d *Data) parseTypes(name string, types []byte) error {
	b := makeBuf(d, unknownFormat{}, name, 0, types)
	for len(b.data) > 0 {
		base := b.off
		n, dwarf64 := b.unitLength()
		if n != Offset(uint32(n)) {
			b.error("type unit length overflow")
			return b.err
		}
		hdroff := b.off
		vers := int(b.uint16())
		if vers != 4 {

	case 2:
		return uint64(b.uint16())
	case 4:
		return uint64(b.uint32())
	case 8:
		return b.uint64()
	}
	b.error("unknown address size")
	return 0
}

func (b *buf) unitLength() (length Offset, dwarf64 bool) {
	length = Offset(b.uint32())
	if length == 0xffffffff {
		dwarf64 = true
		length = Offset(b.uint64())
	} else if length >= 0xfffffff0 {

// all of the header fields in r.
func (r *LineReader) readHeader(compDir string) error {
	buf := &r.buf

	// Read basic header fields [DWARF2 6.2.4].
	hdrOffset := buf.off
	unitLength, dwarf64 := buf.unitLength()
	r.endOffset = buf.off + unitLength
	if r.endOffset > buf.off+Offset(len(buf.data)) {
		return DecodeError{"line", hdrOffset, fmt.Sprintf("line table end %d exceeds section size %d", r.endOffset, buf.off+Offset(len(buf.data)))}

		})

		d.newrefattr(die, dwarf.DW_AT_type, d.defptrto(dwhs))
	}
}

// createUnitLength creates the initial length field with value v and update
// offset of unit_length if needed.
func (d *dwctxt) createUnitLength(su *loader.SymbolBuilder, v uint64) {
	if isDwarf64(d.linkctxt) {
		su.AddUint32(d.arch, 0xFFFFFFFF)
	}
	d.addDwarfAddrField(su, v)
}