}
	pp := objw.NewProgs(fn, worker)
	defer pp.Free()
	genssa(f, pp)
	// Check frame size again.
	// The check above included only the space needed for local variables.
	// After genssa, the space needed includes local variables and the callee arg region.
	// We must do this check prior to calling pp.Flush.
	// If there are any oversized stack frames,
	// the assembler may emit inscrutable complaints about invalid instructions.

	if n < 1 {
		return
	}
	frame, _ := CallersFrames(rpc).Next()
	return frame.PC, frame.File, frame.Line, frame.PC != 0
}

// Callers fills the slice pc with the return program counters of function invocations
// on the calling goroutine's stack. The argument skip is the number of stack frames
// to skip before recording in pc, with 0 identifying the frame for Callers itself and
// 1 identifying the caller of Callers.

    while (buffer.size != 1024L) source.read(buffer, 1024)
    stream1.close(ErrorCode.CANCEL, null)
    val frame1 = peer.takeFrame()
    assertThat(frame1.type).isEqualTo(Http2.TYPE_HEADERS)
    val frame2 = peer.takeFrame()
    assertThat(frame2.type).isEqualTo(Http2.TYPE_RST_STREAM)
    val frame3 = peer.takeFrame()
    assertThat(frame3.type).isEqualTo(Http2.TYPE_RST_STREAM)
    assertThat(connection.readBytes.acknowledged).isEqualTo(0L)

    close(ErrorCode.PROTOCOL_ERROR, ErrorCode.PROTOCOL_ERROR, e)
  }

  /**
   * Sends any initial frames and starts reading frames from the remote peer. This should be called
   * after [Builder.build] for all new connections.
   *
   * @param sendConnectionPreface true to send connection preface frames. This should always be true
   *     except for in tests that don't check for a connection preface.

		t.Fatalf("unexpected: %v %d %v", err, n, buf)
	}
	// read the remaining frame
	buf = make([]byte, 2)
	if n, err := r.Read(buf); err != nil && n != 2 && bytes.Equal(buf, []byte{0x03, 0x04}) {
		t.Fatalf("unexpected: %v %d %v", err, n, buf)
	}
	// read with buffer equal to frame
	buf = make([]byte, 3)
	if n, err := r.Read(buf); err != nil && n != 3 && bytes.Equal(buf, []byte{0x05, 0x06, 0x07}) {

func formatStack(pcs []uintptr) string {
	// When debugging, show file/line/content of files other than this one.
	const debug = false

	var buf strings.Builder
	i := 0
	frames := runtime.CallersFrames(pcs)
	for {
		fr, more := frames.Next()
		if debug {
			fmt.Fprintf(&buf, "pc=%x ", pcs[i])
			i++
		}
		if base := filepath.Base(fr.File); base == "traceback_system_test.go" || debug {

<th>Region type</th>
<th>Count</th>
<th>Duration distribution (complete tasks)</th>
</tr>
{{range $}}
  <tr>
    <td><pre>{{printf "%q" .Type}}<br>{{.Frame.Func}} @ {{printf "0x%x" .Frame.PC}}<br>{{.Frame.File}}:{{.Frame.Line}}</pre></td>
    <td><a href="/userregion?type={{.Type}}&pc={{.Frame.PC | printf "%x"}}">{{.Histogram.Count}}</a></td>
    <td>{{.Histogram.ToHTML (.UserRegionURL)}}</td>
  </tr>
{{end}}
</table>
</body>
</html>

		"Drops functions above the highest matched frame.",
		"If set, all frames above the highest match are dropped from every sample.",
		"Matching includes the function name, filename or object name."),
	"tagroot": helpText(
		"Adds pseudo stack frames for labels key/value pairs at the callstack root.",
		"A comma-separated list of label keys.",
		"The first key creates frames at the new root."),
	"tagleaf": helpText(

  /**
   * HTTP/2 only. Send a push promise header block.
   *
   * A push promise contains all the headers that pertain to a server-initiated request, and a
   * `promisedStreamId` to which response frames will be delivered. Push promise frames are sent as
   * a part of the response to `streamId`. The `promisedStreamId` has a priority of one greater than
   * `streamId`.
   *
   * @param streamId client-initiated stream ID.  Must be an odd number.

	var pc [maxStackLen]uintptr
	// Skip two extra frames to account for this function
	// and runtime.Callers itself.
	n := runtime.Callers(skip+2, pc[:])
	if n == 0 {
		panic("testing: zero callers found")
	}
	frames := runtime.CallersFrames(pc[:n])
	var firstFrame, prevFrame, frame runtime.Frame
	for more := true; more; prevFrame = frame {
		frame, more = frames.Next()
		if frame.Function == "runtime.gopanic" {
			continue