"runtime/internal/sys"
	"unsafe"
)

type slice struct {
	array unsafe.Pointer
	len   int
	cap   int
}

// A notInHeapSlice is a slice backed by runtime/internal/sys.NotInHeap memory.
type notInHeapSlice struct {
	array *notInHeap
	len   int
	cap   int
}

func panicmakeslicelen() {
	panic(errorString("makeslice: len out of range"))
}

func panicmakeslicecap() {

const (
	pdNil   uintptr = 0
	pdReady uintptr = 1
	pdWait  uintptr = 2
)

const pollBlockSize = 4 * 1024

// Network poller descriptor.
//
// No heap pointers.
type pollDesc struct {
	_     sys.NotInHeap
	link  *pollDesc      // in pollcache, protected by pollcache.lock
	fd    uintptr        // constant for pollDesc usage lifetime
	fdseq atomic.Uintptr // protects against stale pollDesc

// must be specially handled. GC currently assumes that the finalizer
// queue does not grow during marking (but it can shrink).
type finblock struct {
	_       sys.NotInHeap
	alllink *finblock
	next    *finblock
	cnt     uint32
	_       int32
	fin     [(_FinBlockSize - 2*goarch.PtrSize - 2*4) / unsafe.Sizeof(finalizer{})]finalizer
}

var fingStatus atomic.Uint32

		r := recv.X // the channel
		return mkcall1(chanfn("chanrecv1", 2, r.Type()), nil, init, r, n1)

	case ir.OAPPEND:
		// x = append(...)
		call := as.Y.(*ir.CallExpr)
		if call.Type().Elem().NotInHeap() {
			base.Errorf("%v can't be allocated in Go; it is incomplete (or unallocatable)", call.Type().Elem())
		}
		var r ir.Node
		switch {
		case isAppendOfMake(call):
			// x = append(y, make([]T, y)...)

var stackpool [_NumStackOrders]struct {
	item stackpoolItem
	_    [(cpu.CacheLinePadSize - unsafe.Sizeof(stackpoolItem{})%cpu.CacheLinePadSize) % cpu.CacheLinePadSize]byte
}

type stackpoolItem struct {
	_    sys.NotInHeap
	mu   mutex
	span mSpanList
}

// Global pool of large stack spans.
var stackLarge struct {
	lock mutex
	free [heapAddrBits - pageShift]mSpanList // free lists by log_2(s.npages)
}

// moduledata is stored in statically allocated non-pointer memory;
// none of the pointers here are visible to the garbage collector.
type moduledata struct {
	sys.NotInHeap // Only in static data

	pcHeader     *pcHeader
	funcnametab  []byte
	cutab        []uint32
	filetab      []byte
	pctab        []byte
	pclntable    []byte
	ftab         []functab

// See https://golang.org/s/go12symtab.
// Keep in sync with linker (../cmd/link/internal/ld/pcln.go:/pclntab)
// and with package debug/gosym and with symtab.go in package runtime.
type _func struct {
	sys.NotInHeap // Only in static data

	entryOff uint32 // start pc, as offset from moduledata.text/pcHeader.textStart
	nameOff  int32  // function name, as index into moduledata.funcnametab.

	args        int32  // in/out args size