// callerpc is a return PC of the function that calls this function,
// pc is start PC of the function that calls this function.
func raceReadObjectPC(t *_type, addr unsafe.Pointer, callerpc, pc uintptr) {
	kind := t.Kind_ & abi.KindMask
	if kind == abi.Array || kind == abi.Struct {
		// for composite objects we have to read every address
		// because a write might happen to any subobject.
		racereadrangepc(addr, t.Size_, callerpc, pc)
	} else {

	if ptrdataSize := typ.PtrBytes - off; size > ptrdataSize {
		size = ptrdataSize
	}

	if typ.Kind_&abi.KindGCProg == 0 {
		cgoCheckBits(src, typ.GCData, off, size)
		return
	}
	switch typ.Kind_ & abi.KindMask {
	default:
		throw("can't happen")
	case abi.Array:
		at := (*arraytype)(unsafe.Pointer(typ))
		for i := uintptr(0); i < at.Len; i++ {
			if off < at.Elem.Size_ {

   * RandomAccess} support, then this operation is guaranteed to be {@code O(1)}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Streams#findLast Streams.findLast(stream).get()}
   *
   * @return the last element of {@code iterable}
   * @throws NoSuchElementException if the iterable is empty
   */
  @ParametricNullness

}

func pinnerGetPtr(i *any) unsafe.Pointer {
	e := efaceOf(i)
	etyp := e._type
	if etyp == nil {
		panic(errorString("runtime.Pinner: argument is nil"))
	}
	if kind := etyp.Kind_ & abi.KindMask; kind != abi.Pointer && kind != abi.UnsafePointer {
		panic(errorString("runtime.Pinner: argument is not a pointer: " + toRType(etyp).string()))
	}
	if inUserArenaChunk(uintptr(e.data)) {

   * RandomAccess} support, then this operation is guaranteed to be {@code O(1)}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Streams#findLast Streams.findLast(stream).get()}
   *
   * @return the last element of {@code iterable}
   * @throws NoSuchElementException if the iterable is empty
   */
  @ParametricNullness

// Type.commonType.kind
func decodetypeKind(arch *sys.Arch, p []byte) abi.Kind {
	return abi.Kind(p[2*arch.PtrSize+7]) & abi.KindMask //  0x13 / 0x1f
}

// Type.commonType.kind
func decodetypeUsegcprog(arch *sys.Arch, p []byte) bool {
	return abi.Kind(p[2*arch.PtrSize+7])&abi.KindGCProg != 0 //  0x13 / 0x1f
}

// Type.commonType.size

	Struct
	UnsafePointer
)

const (
	// TODO (khr, drchase) why aren't these in TFlag?  Investigate, fix if possible.
	KindDirectIface Kind = 1 << 5
	KindGCProg      Kind = 1 << 6 // Type.gc points to GC program
	KindMask        Kind = (1 << 5) - 1
)

// TFlag is used by a Type to signal what extra type information is
// available in the memory directly following the Type value.
type TFlag uint8

const (

//go:nosplit
func (l *dlogger) p(x any) *dlogger {
	if !dlogEnabled {
		return l
	}
	l.w.byte(debugLogPtr)
	if x == nil {
		l.w.uvarint(0)
	} else {
		v := efaceOf(&x)
		switch v._type.Kind_ & abi.KindMask {
		case abi.Chan, abi.Func, abi.Map, abi.Pointer, abi.UnsafePointer:
			l.w.uvarint(uint64(uintptr(v.data)))
		default:
			throw("not a pointer type")
		}
	}
	return l
}

//go:nosplit

}

//go:nosplit
func doubleCheckTypePointersOfType(s *mspan, typ *_type, addr, size uintptr) {
	if typ == nil || typ.Kind_&abi.KindGCProg != 0 {
		return
	}
	if typ.Kind_&abi.KindMask == abi.Interface {
		// Interfaces are unfortunately inconsistently handled
		// when it comes to the type pointer, so it's easy to
		// produce a lot of false positives here.
		return
	}

	arena *userArena
}

func NewUserArena() *UserArena {
	return &UserArena{newUserArena()}
}

func (a *UserArena) New(out *any) {
	i := efaceOf(out)
	typ := i._type
	if typ.Kind_&abi.KindMask != abi.Pointer {
		panic("new result of non-ptr type")
	}
	typ = (*ptrtype)(unsafe.Pointer(typ)).Elem
	i.data = a.arena.new(typ)
}

func (a *UserArena) Slice(sl any, cap int) {