// Size of an address, in bytes. Zero means unknown.
	addrsize() int
}

// Some parts of DWARF have no data format, e.g., abbrevs.
type unknownFormat struct{}

func (u unknownFormat) version() int {
	return 0
}

func (u unknownFormat) dwarf64() (bool, bool) {
	return false, false
}

func (u unknownFormat) addrsize() int {
	return 0
}

}

// Implement the dataFormat interface.

func (u *unit) version() int {
	return u.vers
}

func (u *unit) dwarf64() (bool, bool) {
	return u.is64, true
}

func (u *unit) addrsize() int {
	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()

	Opcode   uint32   // Encoded opcode bits, left aligned (first byte is Opcode>>24, etc)
	Args     Args     // Instruction arguments, in Intel order
	Mode     int      // processor mode in bits: 16, 32, or 64
	AddrSize int      // address size in bits: 16, 32, or 64
	DataSize int      // operand size in bits: 16, 32, or 64
	MemBytes int      // size of memory argument in bytes: 1, 2, 4, 8, 16, and so on.

		// versions.
		return DecodeError{"line", hdrOffset, fmt.Sprintf("unknown line table version %d", r.version)}
	}
	if r.version >= 5 {
		r.addrsize = int(buf.uint8())
		r.segmentSelectorSize = int(buf.uint8())
	} else {
		r.addrsize = buf.format.addrsize()
		r.segmentSelectorSize = 0
	}
	var headerLength Offset
	if dwarf64 {
		headerLength = Offset(buf.uint64())
	} else {

		if err != nil {
			t.Errorf("%s: %v", test.name, err)
		}

		r := data.Reader()
		if r.AddressSize() != test.addrSize {
			t.Errorf("%s: got address size %d, want %d", test.name, r.AddressSize(), test.addrSize)
		}
		if r.ByteOrder() != test.byteOrder {
			t.Errorf("%s: got byte order %s, want %s", test.name, r.ByteOrder(), test.byteOrder)
		}
	}
}

				}
			}
			inst.Op = MOVNTSS
		}
	}

	// Add implicit arguments.
	switch inst.Op {
	case MONITOR:
		inst.Args[0] = EDX
		inst.Args[1] = ECX
		inst.Args[2] = EAX
		if inst.AddrSize == 16 {
			inst.Args[2] = AX
		}

	case MWAIT:
		if inst.Mode == 64 {
			inst.Args[0] = RCX
			inst.Args[1] = RAX
		} else {
			inst.Args[0] = ECX
			inst.Args[1] = EAX
		}
	}

	for len(buf.data) > 0 {
		low := buf.addr()
		high := buf.addr()

		if low == 0 && high == 0 {
			break
		}

		if low == ^uint64(0)>>uint((8-u.addrsize())*8) {
			base = high
		} else {
			ret = append(ret, [2]uint64{base + low, base + high})
		}
	}

	return ret, nil
}

	if rexIndex >= 0 {
		if rexUsed != 0 {
			rexUsed |= PrefixREX
		}
		if rex&^rexUsed == 0 {
			inst.Prefix[rexIndex] |= PrefixImplicit
		}
	}

	inst.DataSize = dataMode
	inst.AddrSize = addrMode
	inst.Mode = mode
	inst.Len = pos
	return inst, nil
}

var errInternal = errors.New("internal error")

// addr16 records the eight 16-bit addressing modes.
var addr16 = [8]Mem{