r.SetAdd(add)
	return off + int64(r.Siz())
}

func (sb *SymbolBuilder) SetAddr(arch *sys.Arch, off int64, tgt Sym) int64 {
	return sb.SetAddrPlus(arch, off, tgt, 0)
}

func (sb *SymbolBuilder) AddStringAt(off int64, str string) int64 {
	strLen := int64(len(str))
	if off+strLen > int64(len(sb.data)) {
		panic("attempt to write past end of buffer")
	}
	copy(sb.data[off:off+strLen], str)
	return off + strLen
}

	// Write filetab.
	writeFiletab := func(ctxt *Link, s loader.Sym) {
		sb := ctxt.loader.MakeSymbolUpdater(s)

		// Write the strings.
		for filename, loc := range fileOffsets {
			sb.AddStringAt(int64(loc), expandFile(filename))
		}
	}
	state.nfiles = uint32(len(fileOffsets))
	state.filetab = state.addGeneratedSym(ctxt, "runtime.filetab", fileSize, writeFiletab)

	return cuOffsets
}