// in the final binary.
func processSEH(ldr *loader.Loader, arch *sys.Arch, pdata sym.LoaderSym, xdata sym.LoaderSym) error {
	switch arch.Family {
	case sys.AMD64:
		ldr.SetAttrReachable(pdata, true)
		if xdata != 0 {
			ldr.SetAttrReachable(xdata, true)
		}
		return processSEHAMD64(ldr, pdata)
	default:
		// TODO: support SEH on other architectures.
		return fmt.Errorf("unsupported architecture for SEH: %v", arch.Family)

		// an init function
		return nil, 0
	}
	ctxt.loader.SetAttrReachable(amd, true)

	// Create a new init func text symbol. Caller will populate this
	// sym with arch-specific content.
	ifs := ctxt.loader.LookupOrCreateSym("go:link.addmoduledata", 0)
	initfunc := ctxt.loader.MakeSymbolUpdater(ifs)
	ctxt.loader.SetAttrReachable(ifs, true)
	ctxt.loader.SetAttrLocal(ifs, true)
	initfunc.SetType(sym.STEXT)

					// comment below.)
					rs := r.Sym()
					if !d.ldr.AttrUsedInIface(rs) {
						d.ldr.SetAttrUsedInIface(rs, true)
						if d.ldr.AttrReachable(rs) {
							d.ldr.SetAttrReachable(rs, false)
							d.mark(rs, symIdx)
						}
					}
				}
				i += 2
				continue
			case objabi.R_USETYPE:
				// type symbol used for DWARF. we need to load the symbol but it may not

		t.Errorf("newly materialized symbols should not be reachable")
	}

	// ... however it should be possible to set/unset their reachability.
	ldr.SetAttrReachable(es3, true)
	if !ldr.AttrReachable(es3) {
		t.Errorf("expected reachable symbol after update")
	}
	ldr.SetAttrReachable(es3, false)
	if ldr.AttrReachable(es3) {
		t.Errorf("expected unreachable symbol after update")
	}

	// Test expansion of attr bitmaps

// returns a CreateSymForUpdate for update. If the symbol already
// exists, it will update in-place.
func (l *Loader) CreateSymForUpdate(name string, version int) *SymbolBuilder {
	s := l.LookupOrCreateSym(name, version)
	l.SetAttrReachable(s, true)
	return l.MakeSymbolUpdater(s)
}

// Getters for properties of the symbol we're working on.

func (sb *SymbolBuilder) Sym() Sym               { return sb.symIdx }

	size = Rnd(size, int64(ctxt.Arch.PtrSize))
	state.size += size
	s := ctxt.createGeneratorSymbol(name, 0, sym.SPCLNTAB, size, f)
	ctxt.loader.SetAttrReachable(s, true)
	ctxt.loader.SetCarrierSym(s, state.carrier)
	ctxt.loader.SetAttrNotInSymbolTable(s, true)
	return s
}

// makePclntab makes a pclntab object, and assembles all the compilation units

	if infosym == 0 {
		return
	}
	d.ldr.SetAttrNotInSymbolTable(infosym, true)
	d.ldr.SetAttrReachable(infosym, true)
	unit.FuncDIEs = append(unit.FuncDIEs, sym.LoaderSym(infosym))
	if rangesym != 0 {
		d.ldr.SetAttrNotInSymbolTable(rangesym, true)
		d.ldr.SetAttrReachable(rangesym, true)
		unit.RangeSyms = append(unit.RangeSyms, sym.LoaderSym(rangesym))
	}

	*ls = ctxt.loader.LookupOrCreateSym(name, ver)
	ctxt.loader.SetAttrReachable(*ls, true)
}

// mkArchSymVec is similar to  setArchSyms, but operates on elements within
// a slice, where each element corresponds to some symbol version.
func (ctxt *Link) mkArchSymVec(name string, ver int, ls []loader.Sym) {
	ls[ver] = ctxt.loader.LookupOrCreateSym(name, ver)
	ctxt.loader.SetAttrReachable(ls[ver], true)
}

	addLabelSyms := func(s loader.Sym, limit, sz int64) {
		v := ldr.SymValue(s)
		for off := limit; off < sz; off += limit {
			p := ldr.LookupOrCreateSym(offsetLabelName(ldr, s, off), ldr.SymVersion(s))
			ldr.SetAttrReachable(p, true)
			ldr.SetSymValue(p, v+off)
			ldr.SetSymSect(p, ldr.SymSect(s))
			if ctxt.IsDarwin() {
				ld.AddMachoSym(ldr, p)
			} else if ctxt.IsWindows() {
				ld.AddPELabelSym(ldr, p)
			} else {

			name := fmt.Sprintf("%s-tramp%d", oName, i)
			if r.Add() != 0 {
				name = fmt.Sprintf("%s%+x-tramp%d", oName, r.Add(), i)
			}
			tramp = ldr.LookupOrCreateSym(name, int(ldr.SymVersion(rs)))
			ldr.SetAttrReachable(tramp, true)
			if ldr.SymType(tramp) == sym.SDYNIMPORT {
				// Do not reuse trampoline defined in other module.
				continue
			}
			if oName == "runtime.deferreturn" {