// SPDY connection.
//
// The stream tunnel proxy tunnels SPDY frames through a WebSocket
// connection, and it is used for the PortForward subprotocol (e.g.
// kubectl port-forward). This proxy implements tunneling by transparently
// encoding and decoding SPDY framed data into and out of the payload of a
// WebSocket data frame. The primary structure for this tunneling is

		w.byte(byte(traceEvStacks))
	}

	// Emit stack event.
	w.byte(byte(traceEvStack))
	w.varint(uint64(node.id))
	w.varint(uint64(len(frames)))
	for _, frame := range frames {
		w.varint(uint64(frame.PC))
		w.varint(frame.funcID)
		w.varint(frame.fileID)
		w.varint(frame.line)
	}

	// Recursively walk all child nodes.
	for i := range node.children {
		child := node.children[i].Load()
		if child == nil {

	"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{
			PC:   f.PC,
			Fn:   f.Func,
			File: f.File,
			Line: int(f.Line),
		})

Russ Cox <******@****.***> 1667840325 -0500

	switch len(ci.frames) {
	case 0: // In the rare case when there are no frames at all, we return Frame{}.
		return
	case 1:
		frame = ci.frames[0]
		ci.frames = ci.frameStore[:0]
	case 2:
		frame = ci.frames[0]
		ci.frameStore[0] = ci.frames[1]
		ci.frames = ci.frameStore[:1]
	default:
		frame = ci.frames[0]
		ci.frames = ci.frames[1:]
	}
	more = len(ci.frames) > 0
	if frame.funcInfo.valid() {

	}

	frames := runtime.CallersFrames(pcs[:])
	frame, _ := frames.Next()

	inlined := frame.Func == nil // Func always set to nil for inlined frames
	if wantInlined != inlined {
		panic(fmt.Sprintf("caller %s inlined got %v want %v", frame.Function, inlined, wantInlined))
	}

	return runtime.FrameStartLine(&frame)

      reason: String,
    )
  }

  /**
   * Process the next protocol frame.
   *
   *  * If it is a control frame this will result in a single call to [FrameCallback].
   *  * If it is a message frame this will result in a single call to [FrameCallback.onReadMessage].
   *    If the message spans multiple frames, each interleaved control frame will result in a
   *    corresponding call to [FrameCallback].
   */

				totalTraceSamples++
				if hogRegion != nil && ev.Goroutine() == hogRegion.Goroutine() {
					traceSamples++
					var fns []string
					ev.Stack().Frames(func(frame trace.StackFrame) bool {
						if frame.Func != "runtime.goexit" {
							fns = append(fns, fmt.Sprintf("%s:%d", frame.Func, frame.Line))
						}
						return true
					})
					stack := strings.Join(fns, "|")
					traceStacks[stack]++
				}
			}

	}

	frames := f.dwarfSourceLine(addr)
	if frames != nil {
		return frames, nil
	}

	return nil, fmt.Errorf("no line information for PC=%#x", addr)
}

// dwarfSourceLine tries to get file/line information using DWARF.
// This is for C functions that appear in the profile.
// Returns nil if there is no information available.
func (f *file) dwarfSourceLine(addr uint64) []driver.Frame {

	lock.Lock()
	defer lock.Unlock()

	var pcs [50]uintptr
	nCallers := runtime.Callers(2, pcs[:])
	frames := runtime.CallersFrames(pcs[:nCallers])
	thisTest := ""
	for {
		frame, more := frames.Next()
		if strings.HasSuffix(frame.File, "_test.go") && testFunction.MatchString(frame.Function) {
			thisTest = frame.Function
			break
		}
		if !more {
			break
		}
	}

	if len(thisTest) == 0 {