{"runtime.mapdelete_fast64", 1},
	{"runtime.mapdelete_faststr", 1},
	{"runtime.mapiternext", 1},
	{"runtime.mapclear", 1},
	{"runtime.makechan64", 1},
	{"runtime.makechan", 1},
	{"runtime.chanrecv1", 1},
	{"runtime.chanrecv2", 1},
	{"runtime.chansend1", 1},
	{"runtime.closechan", 1},
	{"runtime.chanlen", 1},
	{"runtime.chancap", 1},
	{"runtime.writeBarrier", 0},
	{"runtime.typedmemmove", 1},

// *byte is really *runtime.Type
func makechan64(chanType *byte, size int64) (hchan chan any)
func makechan(chanType *byte, size int) (hchan chan any)
func chanrecv1(hchan <-chan any, elem *any)
func chanrecv2(hchan <-chan any, elem *any) bool
func chansend1(hchan chan<- any, elem *any)
func closechan(hchan chan<- any)
func chanlen(hchan any) int
func chancap(hchan any) int

	{"mapdelete_fast64", funcTag, 93},
	{"mapdelete_faststr", funcTag, 94},
	{"mapiternext", funcTag, 95},
	{"mapclear", funcTag, 96},
	{"makechan64", funcTag, 98},
	{"makechan", funcTag, 99},
	{"chanrecv1", funcTag, 101},
	{"chanrecv2", funcTag, 102},
	{"chansend1", funcTag, 104},
	{"closechan", funcTag, 105},
	{"chanlen", funcTag, 106},
	{"chancap", funcTag, 106},
	{"writeBarrier", varTag, 108},

}

// entry points for <- c from compiled code.
//
//go:nosplit
func chanrecv1(c *hchan, elem unsafe.Pointer) {
	chanrecv(c, elem, true)
}

//go:nosplit
func chanrecv2(c *hchan, elem unsafe.Pointer) (received bool) {
	_, received = chanrecv(c, elem, true)
	return
}

// chanrecv receives on channel c and writes the received data to ep.

	walkExprListSafe(n.Lhs, init)
	r.X = walkExpr(r.X, init)
	var n1 ir.Node
	if ir.IsBlank(n.Lhs[0]) {
		n1 = typecheck.NodNil()
	} else {
		n1 = typecheck.NodAddr(n.Lhs[0])
	}
	fn := chanfn("chanrecv2", 2, r.X.Type())
	ok := n.Lhs[1]
	call := mkcall1(fn, types.Types[types.TBOOL], init, r.X, n1)
	return typecheck.Stmt(ir.NewAssignStmt(base.Pos, ok, call))
}

// walkReturn walks an ORETURN node.

type scase struct {
	c    *hchan         // chan
	elem unsafe.Pointer // data element
}

var (
	chansendpc = abi.FuncPCABIInternal(chansend)
	chanrecvpc = abi.FuncPCABIInternal(chanrecv)
)

func selectsetpc(pc *uintptr) {
	*pc = getcallerpc()
}

func sellock(scases []scase, lockorder []uint16) {
	var c *hchan
	for _, o := range lockorder {
		c0 := scases[o].c

		prefix   []string
	}{
		{"heap", []string{"runtime/pprof.allocDeep"}},
		{"block", []string{"runtime.chanrecv1", "runtime/pprof.blockChanDeep"}},
		{"mutex", []string{"sync.(*Mutex).Unlock", "runtime/pprof.blockMutexDeep"}},
		{"goroutine", []string{"runtime.gopark", "runtime.chanrecv", "runtime.chanrecv1", "runtime/pprof.goroutineDeep"}},
	}

	for _, test := range tests {
		t.Run(test.profiler, func(t *testing.T) {

				{"main.main.func2", 0},
			}},
			{trace.EventStateTransition, "Goroutine Running->Waiting", []frame{
				{"runtime.chanrecv1", 0},
				{"main.main.func3", 0},
			}},
			{trace.EventStateTransition, "Goroutine Running->Waiting", []frame{
				{"runtime.chanrecv1", 0},
				{"main.main.func4", 0},
			}},
			{trace.EventStateTransition, "Goroutine Waiting->Runnable", []frame{
				{"runtime.chansend1", 0},

	lastStwReason  uint64

	inlineToStringID  []uint64
	builtinToStringID []uint64
}

const (
	// Block reasons
	sForever = iota
	sPreempted
	sGosched
	sSleep
	sChanSend
	sChanRecv
	sNetwork
	sSync
	sSyncCond
	sSelect
	sEmpty
	sMarkAssistWait

	// STW kinds
	sSTWUnknown
	sSTWGCMarkTermination
	sSTWGCSweepTermination
	sSTWWriteHeapDump
	sSTWGoroutineProfile

func walkRecv(n *ir.UnaryExpr) ir.Node {
	if n.Typecheck() == 0 {
		base.Fatalf("missing typecheck: %+v", n)
	}
	init := ir.TakeInit(n)

	n.X = walkExpr(n.X, &init)
	call := walkExpr(mkcall1(chanfn("chanrecv1", 2, n.X.Type()), nil, &init, n.X, typecheck.NodNil()), &init)
	return ir.InitExpr(init, call)
}

func convas(n *ir.AssignStmt, init *ir.Nodes) *ir.AssignStmt {
	if n.Op() != ir.OAS {