// complications with instrumentation (coverage, etc).
func mapinitnoop()

// mapclone for implementing maps.Clone
//
//go:linkname mapclone maps.clone
func mapclone(m any) any {
	e := efaceOf(&m)
	e.data = unsafe.Pointer(mapclone2((*maptype)(unsafe.Pointer(e._type)), (*hmap)(e.data)))
	return m
}

// 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 {

func (v Value) Elem() Value {
	k := v.kind()
	switch k {
	case Interface:
		var eface any
		if v.typ().NumMethod() == 0 {
			eface = *(*any)(v.ptr)
		} else {
			eface = (any)(*(*interface {
				M()
			})(v.ptr))
		}
		x := unpackEface(eface)
		if x.flag != 0 {
			x.flag |= v.flag.ro()
		}
		return x
	case Pointer:
		ptr := v.ptr

		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)
}

func (t *timer) hchan() *hchan {
	if !t.isChan {
		badTimer()
	}
	// Note: t.arg is a chan time.Time,
	// and runtime cannot refer to that type,
	// so we cannot use a type assertion.
	return (*hchan)(efaceOf(&t.arg).data)
}

// updateHeap updates t as directed by t.state, updating t.state
// and returning a bool indicating whether the state (and ts.heap[0].when) changed.

// If ep points to the stack, only static live information will be returned
// (i.e. not for objects which are only dynamically live stack objects).
func getgcmask(ep any) (mask []byte) {
	e := *efaceOf(&ep)
	p := e.data
	t := e._type

	var et *_type
	if t.Kind_&abi.KindMask != abi.Pointer {
		throw("bad argument to getgcmask: expected type to be a pointer to the value type whose mask is being queried")

		arch:     ctxt.Arch,
		tmap:     make(map[string]loader.Sym),
		tdmap:    make(map[loader.Sym]loader.Sym),
		rtmap:    make(map[loader.Sym]loader.Sym),
	}
	d.typeRuntimeEface = d.lookupOrDiag("type:runtime.eface")
	d.typeRuntimeIface = d.lookupOrDiag("type:runtime.iface")

	if ctxt.HeadType == objabi.Haix {
		// Initial map used to store package size for each DWARF section.
		dwsectCUSize = make(map[string]uint64)
	}