version_segments = version.split('.')
  # Treat "0.24" as "0.24.0"
  if len(version_segments) == 2:
    version_segments.append('0')
  for seg in version_segments:
    if not seg.isdigit():
      return None

  version_str = ''.join(['%03d' % int(seg) for seg in version_segments])
  return int(version_str)


def retrieve_bazel_version():
  """Retrieve installed bazel version (or bazelisk).

TEXT	racecallatomic<>(SB), NOSPLIT, $0
	MOVD	24(R15), R5			// Address (arg1, after 2xBL).
	// If we pass an invalid pointer to the TSan runtime, it will cause a
	// "fatal error: unknown caller pc". So trigger a SEGV here instead.
	MOVB	(R5), R0
	MOVD	runtime·racearenastart(SB), R0
	CMPUBLT	R5, R0, racecallatomic_data	// Before racearena start?
	MOVD	runtime·racearenaend(SB), R0

	// takes a lot of time, and most patterns will just have a couple of wildcards.
	if r.pat == nil {
		return -1
	}
	i := 0
	for _, seg := range r.pat.segments {
		if seg.wild && seg.s != "" {
			if name == seg.s {
				return i
			}
			i++
		}
	}
	return -1
}

func (r *Request) expectsContinue() bool {

	// R0 = *ThreadState
	// R1 = caller pc
	// R2 = pc
	// R3 = addr of incoming arg list

	// Trigger SIGSEGV early.
	MOVD	40(RSP), R3	// 1st arg is addr. after two times BL, get it at 40(RSP)
	MOVB	(R3), R13	// segv here if addr is bad
	// Check that addr is within [arenastart, arenaend) or within [racedatastart, racedataend).
	MOVD	runtime·racearenastart(SB), R10
	CMP	R10, R3
	BLT	racecallatomic_data

func set2(x int) int64 {
	var a int // ERROR "moved to heap: a"
	v := reflect.ValueOf(&a).Elem()
	vx := reflect.ValueOf(x) // ERROR "x escapes to heap"
	v.Set(vx)
	return v.Int()
}

func set3(v reflect.Value, x int) { // ERROR "v does not escape"
	v.SetInt(int64(x))
}

func set4(x int) int {
	var a int
	v := reflect.ValueOf(&a).Elem() // a should not escape, no error printed
	v.SetInt(int64(x))

// R8 contains addr of target function.
TEXT	racecallatomic<>(SB), NOSPLIT, $0-0
	// Trigger SIGSEGV early if address passed to atomic function is bad.
	MOVD	(R6), R7	// 1st arg is addr
	MOVB	(R7), R9	// segv here if addr is bad
	// Check that addr is within [arenastart, arenaend) or within [racedatastart, racedataend).
	MOVD	runtime·racearenastart(SB), R9
	CMP	R7, R9
	BLT	racecallatomic_data
	MOVD	runtime·racearenaend(SB), R9

}

func addsection(ldr *loader.Loader, arch *sys.Arch, seg *sym.Segment, name string, rwx int) *sym.Section {
	sect := ldr.NewSection()
	sect.Rwx = uint8(rwx)
	sect.Name = name
	sect.Seg = seg
	sect.Align = int32(arch.PtrSize) // everything is at least pointer-aligned
	seg.Sections = append(seg.Sections, sect)
	return sect
}

func usage() {

  TF_Operation* feed3 = TF_GraphOperationByName(graph, "imported3/feed");
  TF_Operation* neg3 = TF_GraphOperationByName(graph, "imported3/neg");
  ASSERT_TRUE(scalar3 != nullptr);
  ASSERT_TRUE(feed3 != nullptr);
  ASSERT_TRUE(neg3 != nullptr);

  // Check that newly-imported scalar and feed have control deps (neg3 will
  // inherit them from input)
  TF_Operation* control_inputs[100];

		}
	}
	return nil
}

func TestSegv(t *testing.T) {
	switch runtime.GOOS {
	case "plan9", "windows":
		t.Skipf("no signals on %s", runtime.GOOS)
	}

	for _, test := range []string{"Segv", "SegvInCgo", "TgkillSegv", "TgkillSegvInCgo"} {
		test := test

		// The tgkill variants only run on Linux.
		if runtime.GOOS != "linux" && strings.HasPrefix(test, "Tgkill") {
			continue
		}

	}
	if s := ldr.Lookup("runtime.duffzero", sym.SymVerABIInternal); s != 0 && ldr.AttrReachable(s) {
		addLabelSyms(s, 4, 4*64)
	}

	if ctxt.IsDarwin() {
		big := false
		for _, seg := range ld.Segments {
			if seg.Length >= machoRelocLimit {
				big = true
				break
			}
		}
		if !big {
			return // skip work if nothing big
		}
	}