base := netutils.BigForIP(cidr.IP)
	rangeSpec := cidr.String()
	var family api.IPFamily

	if netutils.IsIPv6CIDR(cidr) {
		family = api.IPv6Protocol
		// Limit the max size, since the allocator keeps a bitmap of that size.
		if max > 65536 {
			max = 65536
		}
	} else {
		family = api.IPv4Protocol
		// Don't use the IPv4 network's broadcast address, but don't just

// license that can be found in the LICENSE file.

package runtime

import (
	"runtime/internal/sys"
)

// pageBits is a bitmap representing one bit per page in a palloc chunk.
type pageBits [pallocChunkPages / 64]uint64

// get returns the value of the i'th bit in the bitmap.
func (b *pageBits) get(i uint) uint {
	return uint((b[i/64] >> (i % 64)) & 1)
}

	// Flush mask to the memory bitmap.
	idx := h.offset / (ptrBits * goarch.PtrSize)
	m := uintptr(1)<<h.low - 1
	bitmap := s.heapBits()
	bitmap[idx] = bswapIfBigEndian(bswapIfBigEndian(bitmap[idx])&m | data)
	// Note: no synchronization required for this write because
	// the allocator has exclusive access to the page, and the bitmap
	// entries are all for a single page. Also, visibility of these

	stackCallArgsSize, retOffset, spill uintptr

	// stackPtrs is a bitmap that indicates whether
	// each word in the ABI stack space (stack-assigned
	// args + return values) is a pointer. Used
	// as the heap pointer bitmap for stack space
	// passed to reflectcall.
	stackPtrs *bitVector

	// inRegPtrs is a bitmap whose i'th bit indicates
	// whether the i'th integer argument register contains

//
// Pages are managed using a bitmap that is sharded into chunks.
// In the bitmap, 1 means in-use, and 0 means free. The bitmap spans the
// process's address space. Chunks are managed in a sparse-array-style structure
// similar to mheap.arenas, since the bitmap may be large on some systems.
//
// The bitmap is efficiently searched by using a radix tree in combination

		i, n uint // bit range to popcnt over.
		want uint // expected popcnt result on that range.
	}
	tests := map[string]struct {
		init  []BitRange // bit ranges to set to 1 in the bitmap.
		tests []test     // a set of popcnt tests to run over the bitmap.
	}{
		"None": {
			tests: []test{
				{0, 1, 0},
				{5, 3, 0},
				{2, 11, 0},
				{PallocChunkPages/4 + 1, PallocChunkPages / 2, 0},
				{0, PallocChunkPages, 0},

)

// MaxPtrmaskBytes is the maximum length of a GC ptrmask bitmap,
// which holds 1-bit entries describing where pointers are in a given type.
// Above this length, the GC information is recorded as a GC program,
// which can express repetition compactly. In either form, the
// information is used by the runtime to initialize the heap bitmap,
// and for large types (like 128 or more words), they are roughly the

	ldr.SetAttrReachable(state.findfunctab, true)
	ldr.SetAttrLocal(state.findfunctab, true)
}

// findContainerSyms returns a bitmap, indexed by symbol number, where there's
// a 1 for every container symbol.
func (ctxt *Link) findContainerSyms() loader.Bitmap {
	ldr := ctxt.loader
	container := loader.MakeBitmap(ldr.NSym())
	// Find container symbols and mark them as such.
	for _, s := range ctxt.Textp {

		}
		n := nptr/8 + 1
		p := sysAlloc(n, &memstats.other_sys)
		if p == nil {
			throw("heapdump: out of memory")
		}
		tmpbuf = (*[1 << 30]byte)(p)[:n]
	}
	// Convert heap bitmap to pointer bitmap.
	clear(tmpbuf[:nptr/8+1])
	s := spanOf(p)
	tp := s.typePointersOf(p, size)
	for {
		var addr uintptr
		if tp, addr = tp.next(p + size); addr == 0 {
			break
		}

		return true
	}
	return false
}

// isHost reports whether c is a byte that can appear in a URL host,
// like www.example.com or user@[::1]:8080
func isHost(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,
	// and this function will return false.
	const mask = 0 |