//
//go:nosplit
func setSignalstackSP(s *stackt, sp uintptr) {
	s.ss_sp = sp
}

//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
	mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
}

func sigdelset(mask *sigset, i int) {
	mask.__bits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
}

//go:nosplit
func (c *sigctxt) fixsigcode(sig uint32) {
}

type WaitStatus uint32

const (
	mask  = 0x7F
	core  = 0x80
	shift = 8

	exited  = 0
	stopped = 0x7F
)

func (w WaitStatus) Exited() bool { return w&mask == exited }

func (w WaitStatus) ExitStatus() int {
	if w&mask != exited {
		return -1
	}
	return int(w >> shift)
}

func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != 0 }

//	VCHAR          =  %x21-7E
func validHeaderValueByte(c byte) bool {
	// mask is a 128-bit bitmap with 1s for allowed bytes,
	// so that the byte c can be tested with a shift and an and.
	// If c >= 128, then 1<<c and 1<<(c-64) will both be zero.
	// Since this is the obs-text range, we invert the mask to
	// create a bitmap with 1s for disallowed bytes.
	const mask = 0 |
		(1<<(0x7f-0x21)-1)<<0x21 | // VCHAR: %x21-7E
		1<<0x20 | // SP: %x20

	bitmask.IterateBitMasks(p.topology.CPUDetails.NUMANodes().List(), func(mask bitmask.BitMask) {
		// First, update minAffinitySize for the current request size.
		cpusInMask := p.topology.CPUDetails.CPUsInNUMANodes(mask.GetBits()...).Size()
		if cpusInMask >= request && mask.Count() < minAffinitySize {
			minAffinitySize = mask.Count()
		}

		// Then check to see if we have enough CPUs available on the current

	// read.
	//
	// These steps are complicated by the rules around foreground process
	// groups. A process group cannot be foreground if it is "orphaned",
	// unless it masks SIGTTOU.  i.e., to be foreground the process group
	// must have a parent process group in the same session or mask SIGTTOU
	// (which we do). An orphaned process group cannot receive
	// terminal-generated SIGTSTP at all.
	//
	// Achieving this requires three processes total:

	}

	// Bits 0:51 (bytes 0:8, bits 0:64, shift 0, mask 51).
	v.l0 = byteorder.LeUint64(x[0:8])
	v.l0 &= maskLow51Bits
	// Bits 51:102 (bytes 6:14, bits 48:112, shift 3, mask 51).
	v.l1 = byteorder.LeUint64(x[6:14]) >> 3
	v.l1 &= maskLow51Bits
	// Bits 102:153 (bytes 12:20, bits 96:160, shift 6, mask 51).
	v.l2 = byteorder.LeUint64(x[12:20]) >> 6
	v.l2 &= maskLow51Bits

				dr.p, dr.ln, line, err2)
		}
		maskstr := fields[9]
		mask, err3 := strconv.Atoi(maskstr)
		if err3 != nil {
			return funcInlHeur, nil, fmt.Errorf("bad mask val %s line %d: %q err=%v",
				dr.p, dr.ln, line, err3)
		}
		callsites[tag] = propsAndScore{
			props: CSPropBits(flags),
			score: score,
			mask:  scoreAdjustTyp(mask),
		}
	}

	// Consume function delimiter.
	dr.scan()

      setPredecessor(succ, pred);
    }
  }

  @Override
  void insertEntry(
      int entryIndex, @ParametricNullness K key, @ParametricNullness V value, int hash, int mask) {
    super.insertEntry(entryIndex, key, value, hash, mask);
    setSucceeds(lastEntry, entryIndex);
    setSucceeds(entryIndex, ENDPOINT);
  }

  @Override
  void accessEntry(int index) {
    if (accessOrder) {

}

// newDotWriter returns non-nil value when mask is valid.
// dotWriter will generate SVGs only for the phases specified in the mask.
// mask can contain following patterns and combinations of them:
// *   - all of them;
// x-y - x through y, inclusive;
// x,y - x and y, but not the passes between.
func newDotWriter(mask string) *dotWriter {
	if mask == "" {
		return nil
	}

	gpRegMask      regMask        // general purpose integer register mask
	fpRegMask      regMask        // floating point register mask
	fp32RegMask    regMask        // floating point register mask
	fp64RegMask    regMask        // floating point register mask
	specialRegMask regMask        // special register mask
	intParamRegs   []int8         // register numbers of integer param (in/out) registers