gs := g.gStates[r.Scope.Goroutine()]
		gs.rangeEnd(ev.Time(), r.Name, ev.Stack(), ctx)
	}
}

func (g *goroutineGenerator) 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.GoID](goID)
		g.gStates[goID] = gs
	}

	logEventGenerator[trace.ProcID]

	gStates   map[trace.GoID]*gState[trace.ProcID]
	inSyscall map[trace.ProcID]*gState[trace.ProcID]
	maxProc   trace.ProcID
}

func newProcGenerator() *procGenerator {
	pg := new(procGenerator)
	rg := func(ev *trace.Event) trace.ProcID {
		return ev.Proc()
	}
	pg.stackSampleGenerator.getResource = rg
	pg.logEventGenerator.getResource = rg
	pg.gStates = make(map[trace.GoID]*gState[trace.ProcID])

	logEventGenerator[trace.ThreadID]

	gStates map[trace.GoID]*gState[trace.ThreadID]
	threads map[trace.ThreadID]struct{}
}

func newThreadGenerator() *threadGenerator {
	tg := new(threadGenerator)
	rg := func(ev *trace.Event) trace.ThreadID {
		return ev.Thread()
	}
	tg.stackSampleGenerator.getResource = rg
	tg.logEventGenerator.getResource = rg
	tg.gStates = make(map[trace.GoID]*gState[trace.ThreadID])

func (e *Emitter) GoroutineTransition(ts time.Duration, from, to GState) {
	e.gstates[from]--
	e.gstates[to]++
	if e.prevGstates == e.gstates {
		return
	}
	if e.tsWithinRange(ts) {
		e.OptionalEvent(&format.Event{
			Name:  "Goroutines",
			Phase: "C",
			Time:  viewerTime(ts),
			PID:   1,
			Arg: &format.GoroutineCountersArg{
				Running:   uint64(e.gstates[GRunning]),
				Runnable:  uint64(e.gstates[GRunnable]),

// add completed events to the ordering. Next is used to pick
// off events in the ordering.
type ordering struct {
	gStates     map[GoID]*gState
	pStates     map[ProcID]*pState // TODO: The keys are dense, so this can be a slice.
	mStates     map[ThreadID]*mState
	activeTasks map[TaskID]taskState
	gcSeq       uint64
	gcState     gcState
	initialGen  uint64
	queue       queue[Event]
}

		return &Reader{
			go121Events: convertOldFormat(tr),
		}, nil
	case version.Go122, version.Go123:
		return &Reader{
			r: br,
			order: ordering{
				mStates:     make(map[ThreadID]*mState),
				pStates:     make(map[ProcID]*pState),
				gStates:     make(map[GoID]*gState),
				activeTasks: make(map[TaskID]taskState),
			},
			// Don't emit a sync event when we first go to emit events.
			emittedSync: true,
		}, nil
	default:

// further events will be processed. This method may leave the gState in
// an inconsistent state.
func (gs *gState[R]) finish(ctx *traceContext) {
	if gs.executing != R(noResource) {
		gs.syscallEnd(ctx.endTime, false, ctx)
		gs.stop(ctx.endTime, trace.NoStack, ctx)
	}
}

// rangeBegin indicates the start of a special range of time.
func (gs *gState[R]) rangeBegin(ts trace.Time, name string, stack trace.Stack) {

		return
	case EvGoUnblock, EvGoSysExit:
		g = ev.Args[0]
		init = gState{ev.Args[1], gWaiting}
		next = gState{ev.Args[1] + 1, gRunnable}
		return
	case EvGoUnblockLocal, EvGoSysExitLocal:
		g = ev.Args[0]
		init = gState{noseq, gWaiting}
		next = gState{seqinc, gRunnable}
		return
	case EvGCStart:
		g = garbage
		init = gState{ev.Args[0], gDead}
		next = gState{ev.Args[0] + 1, gDead}
		return
	default:

package p

import "fmt"

type B struct {
	x  int
	px *int
	pb *B
}

func F1(b *B) { // ERROR "mutates param: b derefs=0"
	b.x = 1
}

func F2(b *B) { // ERROR "mutates param: b derefs=1"
	*b.px = 1
}

func F2a(b *B) { // ERROR "mutates param: b derefs=0"
	b.px = nil
}

func F3(b *B) { // ERROR "leaking param: b"
	fmt.Println(b) // ERROR "\.\.\. argument does not escape"
}

			if err := util.Compare(body, p.States[0].wantBody); err == nil {
				w.WriteHeader(p.States[0].StatusCode)
				w.Write([]byte(p.States[0].Response))
			} else {
				w.WriteHeader(http.StatusBadRequest)
				w.Write([]byte(fmt.Sprintf("wanted body %q got %q", string(p.States[0].wantBody), string(body))))
			}
		} else {
			w.WriteHeader(http.StatusBadRequest)
			w.Write([]byte(fmt.Sprintf("wanted path %q got %q", p.States[0].wantPath, r.URL.Path)))
		}