// Plan 9 Constants

// Open modes
const (
	O_RDONLY  = 0
	O_WRONLY  = 1
	O_RDWR    = 2
	O_TRUNC   = 16
	O_CLOEXEC = 32
	O_EXCL    = 0x1000
)

// Bind flags
const (
	MORDER  = 0x0003 // mask for bits defining order of mounting
	MREPL   = 0x0000 // mount replaces object
	MBEFORE = 0x0001 // mount goes before others in union directory
	MAFTER  = 0x0002 // mount goes after others in union directory

      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) {

		return MaxInt32
	}
	return ilogb(x)
}

// ilogb returns the binary exponent of x. It assumes x is finite and
// non-zero.
func ilogb(x float64) int {
	x, exp := normalize(x)
	return int((Float64bits(x)>>shift)&mask) - bias + exp

}

// 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

			case ipTag:
				l := len(value)
				var ip, mask []byte

				switch l {
				case 8:
					ip = value[:4]
					mask = value[4:]

				case 32:
					ip = value[:16]
					mask = value[16:]

				default:
					return nil, nil, nil, nil, fmt.Errorf("x509: IP constraint contained value of length %d", l)
				}

				if !isValidIPMask(mask) {

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

//go:nosplit
//go:nowritebarrierrec
func sigaddset(mask *sigset, i int) {
	*mask |= 1 << (uint32(i) - 1)
}

func sigdelset(mask *sigset, i int) {
	*mask &^= 1 << (uint32(i) - 1)
}

func setProcessCPUProfiler(hz int32) {
	setProcessCPUProfilerTimer(hz)
}

func setThreadCPUProfiler(hz int32) {

		m := bucketMask(h.B)
		b = (*bmap)(add(h.buckets, (hash&m)*uintptr(t.BucketSize)))
		if c := h.oldbuckets; c != nil {
			if !h.sameSizeGrow() {
				// There used to be half as many buckets; mask down one more power of two.
				m >>= 1
			}
			oldb := (*bmap)(add(c, (hash&m)*uintptr(t.BucketSize)))
			if !evacuated(oldb) {
				b = oldb
			}
		}
	}
	for ; b != nil; b = b.overflow(t) {

				}
				switch sa := sa.(type) {
				case *syscall.SockaddrInet4:
					ifat = append(ifat, &IPNet{IP: IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3]), Mask: CIDRMask(int(puni.OnLinkPrefixLength), 8*IPv4len)})
				case *syscall.SockaddrInet6:
					ifa := &IPNet{IP: make(IP, IPv6len), Mask: CIDRMask(int(puni.OnLinkPrefixLength), 8*IPv6len)}
					copy(ifa.IP, sa.Addr[:])
					ifat = append(ifat, ifa)
				}
			}

				}
				if n <= 0 {
					return nil, &parseError{"invalid pattern syntax: " + pattern}
				}
				if p[start] == 'y' {
					n = 0
				}
				mask := uint64(1)<<n - 1
				m.list = append(m.list, cond{mask, bits, result})
			} else if c == '-' {
				// leading - subtracts from complete set
				m.list = append(m.list, cond{0, 0, true})
			}
			bits = 0
			result = c == '+'