// must be stored in interfaces indirectly. See issue 42076.
func (pd *pollDesc) makeArg() (i any) {
	x := (*eface)(unsafe.Pointer(&i))
	x._type = pdType
	x.data = unsafe.Pointer(&pd.self)
	return
}

var (
	pdEface any    = (*pollDesc)(nil)
	pdType  *_type = efaceOf(&pdEface)._type

type funcval struct {
	fn uintptr
	// variable-size, fn-specific data here
}

type iface struct {
	tab  *itab
	data unsafe.Pointer
}

type eface struct {
	_type *_type
	data  unsafe.Pointer
}

func efaceOf(ep *any) *eface {
	return (*eface)(unsafe.Pointer(ep))
}

// The guintptr, muintptr, and puintptr are all used to bypass write barriers.

func TypeOf(a any) *Type {
	eface := *(*EmptyInterface)(unsafe.Pointer(&a))
	// Types are either static (for compiler-created types) or
	// heap-allocated but always reachable (for reflection-created
	// types, held in the central map). So there is no need to
	// escape types. noescape here help avoid unnecessary escape
	// of v.
	return (*Type)(NoEscape(unsafe.Pointer(eface.Type)))
}

			if mp.resumesema != 0 {
				stdcall1(_SetEvent, mp.resumesema)
			}
		}
		return 0
	}
	params := _DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS{
		callback: compileCallback(*efaceOf(&fn), true),
	}
	handle := uintptr(0)
	stdcall3(powerRegisterSuspendResumeNotification, _DEVICE_NOTIFY_CALLBACK,
		uintptr(unsafe.Pointer(&params)), uintptr(unsafe.Pointer(&handle)))
}

// cdecl calling convention; otherwise, it will use stdcall. On amd64,
// it always uses fastcall. On arm, it always uses the ARM convention.
//
//go:linkname compileCallback syscall.compileCallback
func compileCallback(fn eface, cdecl bool) (code uintptr) {
	if GOARCH != "386" {
		// cdecl is only meaningful on 386.
		cdecl = false
	}

	if fn._type == nil || (fn._type.Kind_&abi.KindMask) != abi.Func {

		text := "panic while printing panic value"
		switch r := recover().(type) {
		case nil:
			// nothing to do
		case string:
			throw(text + ": " + r)
		default:
			throw(text + ": type " + toRType(efaceOf(&r)._type).string())
		}
	}()
	for p != nil {
		switch v := p.arg.(type) {
		case error:
			p.arg = v.Error()
		case stringer:
			p.arg = v.String()
		}
		p = p.link
	}
}

type UserArena struct {
	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)
}