// User annotations.
	Log(ctx *traceContext, ev *trace.Event)

	// Finish indicates the end of the trace and finalizes generation.
	Finish(ctx *traceContext)
}

// runGenerator produces a trace into ctx by running the generator over the parsed trace.
func runGenerator(ctx *traceContext, g generator, parsed *parsedTrace, opts *genOpts) {
	for i := range parsed.events {
		ev := &parsed.events[i]

		switch ev.Kind() {
		case trace.EventSync:

		g = newGoroutineGenerator(ctx, opts.focusGoroutine, opts.goroutines)
	} else if opts.mode&traceviewer.ModeThreadOriented != 0 {
		g = newThreadGenerator()
	} else {
		g = newProcGenerator()
	}
	runGenerator(ctx, g, parsed, opts)
	return nil

	"io"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
)

func main() {
	log.SetFlags(0)
	ctx, err := newContext()
	if err != nil {
		log.Fatal(err)
	}
	if err := ctx.runGenerators(); err != nil {
		log.Fatal(err)
	}
	if err := ctx.runTestProg("./testprog/annotations.go"); err != nil {
		log.Fatal(err)
	}
	if err := ctx.runTestProg("./testprog/annotations-stress.go"); err != nil {