name, _ := it.evt.strings.get(stringID(ev.Args[2]))
		it.tasks[TaskID(ev.Args[0])] = taskState{name: name, parentID: TaskID(ev.Args[1])}
	case oldtrace.EvUserTaskEnd:
		mappedType = go122.EvUserTaskEnd
		// Event.Task expects the parent and name to be smuggled in extra args
		// and as extra strings.
		ts, ok := it.tasks[TaskID(ev.Args[0])]
		if ok {
			delete(it.tasks, TaskID(ev.Args[0]))
			mappedArgs = timedEventArgs{
				ev.Args[0],

	Name string

	// Value is the value of the attribute.
	Value Value
}

// TaskID is the internal ID of a task used to disambiguate tasks (even if they
// are of the same type).
type TaskID uint64

const (
	// NoTask indicates the lack of a task.
	NoTask = TaskID(^uint64(0))

	// BackgroundTask is the global task that events are attached to if there was

        def op = operations.first(ResolveTaskMutationsBuildOperationType) {
            it.details.taskPath == taskPath
        }
        op.details.buildPath == ":"
        op.details.taskId != null
    }

			p.g = 0

			gs[ev.G] = g
			ps[ev.P] = p
		case EvUserTaskCreate:
			taskid := ev.Args[0]
			if prevEv, ok := tasks[taskid]; ok {
				return fmt.Errorf("task id conflicts (id:%d), %q vs %q", taskid, ev, prevEv)
			}
			tasks[ev.Args[0]] = ev

		case EvUserTaskEnd:
			taskid := ev.Args[0]
			delete(tasks, taskid)

		case EvUserRegion:
			mode := ev.Args[1]
			regions := activeRegions[ev.G]

	"gstatus", // G status
	"g",       // trace.GoID
	"m",       // trace.ThreadID
	"p",       // trace.ProcID
	"string",  // string ID
	"stack",   // stack ID
	"value",   // uint64
	"task",    // trace.TaskID
}

// Names is a helper that produces a mapping of event names to event types.
func Names(specs []Spec) map[string]Type {
	nameToType := make(map[string]Type)
	for i, spec := range specs {

type Validator struct {
	lastTs   trace.Time
	gs       map[trace.GoID]*goState
	ps       map[trace.ProcID]*procState
	ms       map[trace.ThreadID]*schedContext
	ranges   map[trace.ResourceID][]string
	tasks    map[trace.TaskID]string
	seenSync bool
	Go121    bool
}

type schedContext struct {
	M trace.ThreadID
	P trace.ProcID
	G trace.GoID
}

type goState struct {
	state   trace.GoState
	binding *schedContext
}

			Elapsed    time.Duration
			Goroutine  trace.GoID
			What       string
			// TODO: include stack trace of creation time
		}
		type task struct {
			WhenString string
			ID         trace.TaskID
			Duration   time.Duration
			Complete   bool
			Events     []event
			Start, End time.Duration // Time since the beginning of the trace
			GCTime     time.Duration
		}
		var tasks []task

	// reused, so we don't care about a Begin after an End.
	id := TaskID(ev.args[0])
	if _, ok := o.activeTasks[id]; ok {
		return curCtx, false, fmt.Errorf("task ID conflict: %d", id)
	}
	// Get the parent ID, but don't validate it. There's no guarantee
	// we actually have information on whether it's active.
	parentID := TaskID(ev.args[1])
	if parentID == BackgroundTask {

		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:
		return nil, fmt.Errorf("unknown or unsupported version go 1.%d", v)
	}
}

    }

    private <U extends TaskInternal> U task(final String name, Class<U> type) {
        def taskId = taskIdentityFactory.create(name, type, project)
        Mock(type, name: "[task" + taskId.id + "]") {
            getName() >> name
            getTaskDependency() >> Mock(TaskDependency)
            getTaskIdentity() >> taskId
        } as U
    }

    private Task addTask(String name) {