// from stopped via the core dump bit.

const (
	mask    = 0x7F
	core    = 0x80
	exited  = 0x00
	stopped = 0x7F
	shift   = 8
)

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

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

func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }

// intField extracts an integer field in the PSAPI_WORKING_SET_EX_BLOCK union.
func (b PSAPI_WORKING_SET_EX_BLOCK) intField(start, length int) uint64 {
	var mask PSAPI_WORKING_SET_EX_BLOCK
	for pos := start; pos < start+length; pos++ {
		mask |= (1 << pos)
	}

	masked := b & mask
	return uint64(masked >> start)
}

// PSAPI_WORKING_SET_EX_INFORMATION contains extended working set information for a process.

// is set if ptrs[i] is reachable.
func gcTestIsReachable(ptrs ...unsafe.Pointer) (mask uint64) {
	// This takes the pointers as unsafe.Pointers in order to keep
	// them live long enough for us to attach specials. After
	// that, we drop our references to them.

	if len(ptrs) > 64 {
		panic("too many pointers for uint64 mask")
	}

	// Block GC while we attach specials and drop our references

		ret[n].Critical = template.PermittedDNSDomainsCritical

		ipAndMask := func(ipNet *net.IPNet) []byte {
			maskedIP := ipNet.IP.Mask(ipNet.Mask)
			ipAndMask := make([]byte, 0, len(maskedIP)+len(ipNet.Mask))
			ipAndMask = append(ipAndMask, maskedIP...)
			ipAndMask = append(ipAndMask, ipNet.Mask...)
			return ipAndMask
		}

		toCheck = len(payload)
	}

	for i := 0; i < toCheck; i++ {
		t := uint(paddingLen) - uint(i)
		// if i <= paddingLen then the MSB of t is zero
		mask := byte(int32(^t) >> 31)
		b := payload[len(payload)-1-i]
		good &^= mask&paddingLen ^ mask&b
	}

	// We AND together the bits of good and replicate the result across
	// all the bits.
	good &= good << 4
	good &= good << 2
	good &= good << 1

		if flushBgCredit {
			gcFlushBgCredit(workDone)
		}
	}
	return workDone
}

// markrootBlock scans the shard'th shard of the block of memory [b0,
// b0+n0), with the given pointer mask.
//
// Returns the amount of work done.
//
//go:nowritebarrier
func markrootBlock(b0, n0 uintptr, ptrmask0 *uint8, gcw *gcWork, shard int) int64 {
	if rootBlockBytes%(8*goarch.PtrSize) != 0 {

	"fmt"
)

type instArgs [5]instArg

// An instFormat describes the format of an instruction encoding.
// An instruction with 32-bit value x matches the format if x&mask == value
// and the predicator: canDecode(x) return true.
type instFormat struct {
	mask  uint32
	value uint32
	op    Op
	// args describe how to decode the instruction arguments.
	// args is stored as a fixed-size array.

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//sys	LocalFree(hmem Handle) (handle Handle, err error) [failretval!=0]
//sys	SetHandleInformation(handle Handle, mask uint32, flags uint32) (err error)
//sys	FlushFileBuffers(handle Handle) (err error)
//sys	GetFullPathName(path *uint16, buflen uint32, buf *uint16, fname **uint16) (n uint32, err error) = kernel32.GetFullPathNameW

func (b *gcBits) bytep(n uintptr) *uint8 {
	return addb(&b.x, n)
}

// bitp returns a pointer to the byte containing bit n and a mask for
// selecting that bit from *bytep.
func (b *gcBits) bitp(n uintptr) (bytep *uint8, mask uint8) {
	return b.bytep(n / 8), 1 << (n % 8)
}

const gcBitsChunkBytes = uintptr(64 << 10)
const gcBitsHeaderBytes = unsafe.Sizeof(gcBitsHeader{})