sg = c.sendq.dequeue()
			if sg != nil {
				goto recv
			}
			if c.qcount > 0 {
				goto bufrecv
			}
			if c.closed != 0 {
				goto rclose
			}
		} else {
			if raceenabled {
				racereadpc(c.raceaddr(), casePC(casi), chansendpc)
			}
			if c.closed != 0 {
				goto sclose
			}
			sg = c.recvq.dequeue()
			if sg != nil {
				goto send
			}
			if c.qcount < c.dataqsiz {

	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
	b0.Event("GoSyscallEndBlocked")
	b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
	b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
	b0.Event("GoDestroySyscall")
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("GoSyscallEnd")

	case oldtrace.EvGoCreate:
		if it.preInit {
			it.createdPreInit[GoID(ev.Args[0])] = struct{}{}
			return Event{}, errSkip
		}
		mappedType = go122.EvGoCreate
	case oldtrace.EvGoStart:
		if it.preInit {
			mappedType = go122.EvGoStatus
			mappedArgs = timedEventArgs{ev.Args[0], ^uint64(0), uint64(go122.GoRunning)}
			delete(it.createdPreInit, GoID(ev.Args[0]))
		} else {
			mappedType = go122.EvGoStart
		}

		}
	}

	switch x {
	case 0:
		goto L1
		L1: fallthrough; ;
	case 1:
		goto L2
		goto L3
		goto L4
		L2: L3: L4: fallthrough
	default:
	}

	switch x {
	case 0:
		goto L5
		L5: fallthrough
	default:
		goto L6
		goto L7
		goto L8
		L6: L7: L8: fallthrough /* ERROR "cannot fallthrough final case in switch" */
	}

// If an exit hook invokes exit in another goroutine, that exit will block.
func Run(code int) {
	for !locked.CompareAndSwap(0, 1) {
		if Goid() == runGoid.Load() {
			Throw("exit hook invoked exit")
		}
		Gosched()
	}
	defer locked.Store(0)
	runGoid.Store(Goid())
	defer runGoid.Store(0)

	defer func() {
		if e := recover(); e != nil {
			Throw("exit hook invoked panic")
		}
	}()

}

func (g *procGenerator) GoroutineTransition(ctx *traceContext, ev *trace.Event) {
	st := ev.StateTransition()
	goID := st.Resource.Goroutine()

	// If we haven't seen this goroutine before, create a new
	// gState for it.
	gs, ok := g.gStates[goID]
	if !ok {
		gs = newGState[trace.ProcID](goID)
		g.gStates[goID] = gs
	}
	// If we haven't already named this goroutine, try to name it.
	gs.augmentName(st.Stack)

// writeGoStatus emits a GoStatus event as well as any active ranges on the goroutine.
func (w traceWriter) writeGoStatus(goid uint64, mid int64, status traceGoStatus, markAssist bool, stackID uint64) traceWriter {
	// The status should never be bad. Some invariant must have been violated.
	if status == traceGoBad {
		print("runtime: goid=", goid, "\n")
		throw("attempted to trace a bad status for a goroutine")
	}

	// Trace the status.

	// A goroutine gets created on a running P, then starts running.
	b0 := g1.Batch(trace.ThreadID(0), 0)
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b0.Event("GoCreate", trace.GoID(5), testgen.NoStack, testgen.NoStack)
	b0.Event("GoStart", trace.GoID(5), testgen.Seq(1))
	b0.Event("GoStop", "whatever", testgen.NoStack)

	b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
	b0.Event("GoSyscallBegin", testgen.Seq(1), testgen.NoStack)
	b0.Event("GoSyscallEndBlocked")

	// A running goroutine steals proc 0.
	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(2), go122.ProcRunning)
	b1.Event("GoStatus", trace.GoID(2), trace.ThreadID(1), go122.GoRunning)

	b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("GoSyscallEndBlocked")
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
	b0.Event("GoStatus", trace.GoID(4), trace.NoThread, go122.GoRunnable)
	b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
	b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)