// for an object of size ptrdata.  Then it fills that space with the
// pointer bitmask specified by the program prog.
// The bitmask starts at s.startAddr.
// The result must be deallocated with dematerializeGCProg.
func materializeGCProg(ptrdata uintptr, prog *byte) *mspan {
	// Each word of ptrdata needs one bit in the bitmap.
	bitmapBytes := divRoundUp(ptrdata, 8*goarch.PtrSize)

		mask[word/8] |= 1 << (word % 8)
		gcdata = &mask[0]
		ptrdata = (word + 1) * goarch.PtrSize

		// overflow word must be last
		if ptrdata != size {
			panic("reflect: bad layout computation in MapOf")
		}
	}

	b := &abi.Type{
		Align_:   goarch.PtrSize,
		Size_:    size,
		Kind_:    abi.Struct,
		PtrBytes: ptrdata,
		GCData:   gcdata,
	}

			// a gc program (see issue 27447).
			s = materializeGCProg(r.ptrdata(), gcdata)
			gcdata = (*byte)(unsafe.Pointer(s.startAddr))
		}

		b := state.stack.lo + uintptr(obj.off)
		if conservative {
			scanConservative(b, r.ptrdata(), gcdata, gcw, &state)
		} else {
			scanblock(b, r.ptrdata(), gcdata, gcw, &state)
		}

		if s != nil {
			dematerializeGCProg(s)
		}
	}

				return n
			}
		}
		return -1
	}

	strs = make([]string, nnames)

	strdata := make(map[int]string, nnames)
	strlens := make(map[int]int, nnames)

	buildStrings := func() {
		for n, strlen := range strlens {
			data := strdata[n]
			if len(data) <= strlen {
				fatalf("invalid string literal")
			}
			strs[n] = data[:strlen]
		}
	}