ctx.TaskSlice(traceviewer.SliceEvent{
		Name:     task.Name,
		Ts:       ctx.elapsed(startTime),
		Dur:      endTime.Sub(startTime),
		Resource: uint64(task.ID),
		Stack:    ctx.Stack(viewerFrames(startStack)),
		EndStack: ctx.Stack(viewerFrames(endStack)),
		Arg:      arg,
	})
	// Emit an arrow from the parent to the child.
	if task.Parent != nil && task.Start != nil && task.Start.Kind() == trace.EventTaskBegin {

package main

import (
	"fmt"
	"internal/trace"
	"internal/trace/traceviewer"
	"time"
)

// viewerFrames returns the frames of the stack of ev. The given frame slice is
// used to store the frames to reduce allocations.
func viewerFrames(stk trace.Stack) []*trace.Frame {
	var frames []*trace.Frame
	stk.Frames(func(f trace.StackFrame) bool {
		frames = append(frames, &trace.Frame{

			Name:     cr.name,
			Ts:       ctx.elapsed(cr.startTime),
			Dur:      cr.endTime.Sub(cr.startTime),
			Resource: uint64(gs.executing),
			Stack:    ctx.Stack(viewerFrames(cr.startStack)),
			EndStack: ctx.Stack(viewerFrames(cr.endStack)),
			Arg:      cr.arg,
		})
	}
	gs.completedRanges = gs.completedRanges[:0]

	// Continue in-progress ranges.
	for name, r := range gs.activeRanges {

		}
	}

	type procArg struct {
		Proc uint64 `json:"proc,omitempty"`
	}
	st := ev.StateTransition()
	viewerEv := traceviewer.InstantEvent{
		Resource: uint64(ev.Thread()),
		Stack:    ctx.Stack(viewerFrames(ev.Stack())),
		Arg:      procArg{Proc: uint64(st.Resource.Proc())},
	}

	from, to := st.Proc()
	if from == to {
		// Filter out no-op events.
		return
	}
	if to.Executing() {

	st := ev.StateTransition()
	proc := st.Resource.Proc()

	g.maxProc = max(g.maxProc, proc)
	viewerEv := traceviewer.InstantEvent{
		Resource: uint64(proc),
		Stack:    ctx.Stack(viewerFrames(ev.Stack())),
	}

	from, to := st.Proc()
	if from == to {
		// Filter out no-op events.
		return
	}
	if to.Executing() {
		start := ev.Time()
		if from == trace.ProcUndetermined {