f.Names = append(f.Names, newNames...)
}

func maybeAppend(f *Func, ss []*LocalSlot, s *LocalSlot) []*LocalSlot {
	if _, ok := f.NamedValues[*s]; !ok {
		f.NamedValues[*s] = nil
		return append(ss, s)
	}
	return ss
}

func maybeAppend2(f *Func, ss []*LocalSlot, s1, s2 *LocalSlot) []*LocalSlot {
	return maybeAppend(f, maybeAppend(f, ss, s1), s2)
}

func decomposeBuiltInPhi(v *Value) {

	f.Cache.scrPoset = append(f.Cache.scrPoset, po)
}

func (f *Func) localSlotAddr(slot LocalSlot) *LocalSlot {
	a, ok := f.CanonicalLocalSlots[slot]
	if !ok {
		a = new(LocalSlot)
		*a = slot // don't escape slot
		f.CanonicalLocalSlots[slot] = a
	}
	return a
}

func (f *Func) SplitString(name *LocalSlot) (*LocalSlot, *LocalSlot) {
	ptrType := types.NewPtr(types.Types[types.TUINT8])
	lenType := types.Types[types.TINT]

//	                          parent = &{N: s, Type: string}
type LocalSlot struct {
	N    *ir.Name    // an ONAME *ir.Name representing a stack location.
	Type *types.Type // type of slot
	Off  int64       // offset of slot in N

	SplitOf     *LocalSlot // slot is a decomposition of SplitOf
	SplitOffset int64      // .. at this offset.
}

func (s LocalSlot) String() string {
	if s.Off == 0 {

			// the spill location.
			var name LocalSlot
			if v.Op == OpStoreReg {
				name = names[v.Args[0].ID]
			} else {
				name = names[v.ID]
			}
			if name.N != nil && v.Type.Compare(name.Type) == types.CMPeq {
				for _, id := range s.interfere[v.ID] {
					h := f.getHome(id)
					if h != nil && h.(LocalSlot).N == name.N && h.(LocalSlot).Off == name.Off {
						// A variable can interfere with itself.

	t    testing.TB
	ctxt *obj.Link
	f    *ir.Func
}

func (TestFrontend) StringData(s string) *obj.LSym {
	return nil
}
func (d TestFrontend) SplitSlot(parent *LocalSlot, suffix string, offset int64, t *types.Type) LocalSlot {
	return LocalSlot{N: parent.N, Type: t, Off: offset}
}
func (d TestFrontend) Syslook(s string) *obj.LSym {
	return d.ctxt.Lookup(s)
}
func (TestFrontend) UseWriteBarrier() bool {

	slmap  map[slotKey]SlKeyIdx
	slkeys []LocalSlot
}

func newSlotCanonicalizer() *slotCanonicalizer {
	return &slotCanonicalizer{
		slmap:  make(map[slotKey]SlKeyIdx),
		slkeys: []LocalSlot{LocalSlot{N: nil}},
	}
}

type SlKeyIdx uint32

const noSlot = SlKeyIdx(0)

// slotKey is a type-insensitive encapsulation of a LocalSlot; it
// is used to key a map within slotCanonicalizer.

	var tests = []struct {
		val    interface{} // type as a value
		_32bit uintptr     // size on 32bit platforms
		_64bit uintptr     // size on 64bit platforms
	}{
		{Value{}, 72, 112},
		{Block{}, 164, 304},
		{LocalSlot{}, 28, 40},
		{valState{}, 28, 40},
	}

	for _, tt := range tests {
		want := tt._32bit
		if _64bit {
			want = tt._64bit
		}
		got := reflect.TypeOf(tt.val).Size()
		if want != got {

}

type funcPrinter interface {
	header(f *Func)
	startBlock(b *Block, reachable bool)
	endBlock(b *Block, reachable bool)
	value(v *Value, live bool)
	startDepCycle()
	endDepCycle()
	named(n LocalSlot, vals []*Value)
}

type stringFuncPrinter struct {
	w         io.Writer
	printDead bool
}

func (p stringFuncPrinter) header(f *Func) {
	fmt.Fprint(p.w, f.Name)
	fmt.Fprint(p.w, " ")

		fn.LSym.R[i].Type |= objabi.R_WEAK
	}
}

// StackOffset returns the stack location of a LocalSlot relative to the
// stack pointer, suitable for use in a DWARF location entry. This has nothing
// to do with its offset in the user variable.
func StackOffset(slot ssa.LocalSlot) int32 {
	n := slot.N
	var off int64
	switch n.Class {
	case ir.PPARAM, ir.PPARAMOUT:
		if !n.IsOutputParamInRegisters() {

	StringData(string) *obj.LSym

	// Given the name for a compound type, returns the name we should use
	// for the parts of that compound type.
	SplitSlot(parent *LocalSlot, suffix string, offset int64, t *types.Type) LocalSlot

	// Syslook returns a symbol of the runtime function/variable with the
	// given name.
	Syslook(string) *obj.LSym

	// UseWriteBarrier reports whether write barrier is enabled