func makeUpdater(l *loader.Loader, bld *loader.SymbolBuilder, s loader.Sym) *loader.SymbolBuilder {
	if bld != nil {
		return bld
	}
	bld = l.MakeSymbolUpdater(s)
	return bld
}

// peImportSymsState tracks the set of DLL import symbols we've seen
// while reading host objects. We create a singleton instance of this

	ldr := ctxt.loader
	s := ldr.LookupOrCreateSym(name, version)
	ldr.SetIsGeneratedSym(s, true)
	sb := ldr.MakeSymbolUpdater(s)
	sb.SetType(t)
	sb.SetSize(size)
	ctxt.generatorSyms[s] = gen
	return s

		// This slice header is already defined in runtime/proc.go, so we update it here with new contents.
		sh := ldr.Lookup("runtime.runtime_inittasks", 0)
		sb := ldr.MakeSymbolUpdater(sh)
		sb.SetSize(0)
		sb.SetType(sym.SNOPTRDATA) // Could be SRODATA, but see issue 58857.
		sb.AddAddr(ctxt.Arch, t)
		sb.AddUint(ctxt.Arch, uint64(ldr.SymSize(t)/int64(ctxt.Arch.PtrSize)))

		pos, buf := out.writeLoc(n)
		copy(buf[pos:], P)
		out.off += n
		ldr.FreeData(s)
		return buf[pos : pos+n]
	} else {
		n := ldr.SymSize(s)
		pos, buf := out.writeLoc(n)
		out.off += n
		ldr.MakeSymbolUpdater(s).SetData(buf[pos : pos+n])
		return buf[pos : pos+n]
	}

	for name, size := range outerSymSize {
		sym := ldr.Lookup(name, 0)
		if sym == 0 {
			Errorf(nil, "unknown outer symbol with name %s", name)
		} else {
			s := ldr.MakeSymbolUpdater(sym)
			s.SetSize(size)
		}
	}

	// These symbols won't show up in the first loop below because we
	// skip sym.STEXT symbols. Normal sym.STEXT symbols are emitted by walking textp.

	}
}

func elfadddynsym(ldr *loader.Loader, target *Target, syms *ArchSyms, s loader.Sym) {
	ldr.SetSymDynid(s, int32(Nelfsym))
	Nelfsym++
	d := ldr.MakeSymbolUpdater(syms.DynSym)
	name := ldr.SymExtname(s)
	dstru := ldr.MakeSymbolUpdater(syms.DynStr)
	st := ldr.SymType(s)
	cgoeStatic := ldr.AttrCgoExportStatic(s)
	cgoeDynamic := ldr.AttrCgoExportDynamic(s)
	cgoexp := (cgoeStatic || cgoeDynamic)

			// these symbols are undefined and that's OK.
			if target.IsShared() || target.IsPlugin() {
				if ldr.SymName(rs) == "main.main" || (!target.IsPlugin() && ldr.SymName(rs) == "main..inittask") {
					sb := ldr.MakeSymbolUpdater(rs)
					sb.SetType(sym.SDYNIMPORT)
				} else if strings.HasPrefix(ldr.SymName(rs), "go:info.") {
					// Skip go.info symbols. They are only needed to communicate
					// DWARF info between the compiler and linker.

				if d.ctxt.Debugvlog > 1 {
					d.ctxt.Logf("deadcode: %s rewrite %s ref to %s\n",
						d.ldr.SymName(idx), rsn,
						d.ldr.SymName(d.mapinitnoop))
				}
				if su == nil {
					su = d.ldr.MakeSymbolUpdater(idx)
				}
				su.SetRelocSym(i, d.mapinitnoop)
			}
		}
	}
}

func (d *deadcodePass) mark(symIdx, parent loader.Sym) {
	if symIdx != 0 && !d.ldr.AttrReachable(symIdx) {
		d.wq.push(symIdx)

		m.s = s
		m.next = d.ms
		d.ms = m
	}

	if ctxt.IsExternal() {
		// Add real symbol name
		for d := dr; d != nil; d = d.next {
			for m = d.ms; m != nil; m = m.next {
				sb := ldr.MakeSymbolUpdater(m.s)
				sb.SetType(sym.SDATA)
				sb.Grow(int64(ctxt.Arch.PtrSize))
				dynName := sb.Extname()
				// only windows/386 requires stdcall decoration
				if ctxt.Is386() && m.argsize >= 0 {

	// runtime to use. Any changes here must be matched by changes to
	// the definition of moduledata in runtime/symtab.go.
	// This code uses several global variables that are set by pcln.go:pclntab.
	moduledata := ldr.MakeSymbolUpdater(ctxt.Moduledata)

	slice := func(sym loader.Sym, len uint64) {
		moduledata.AddAddr(ctxt.Arch, sym)
		moduledata.AddUint(ctxt.Arch, len)
		moduledata.AddUint(ctxt.Arch, len)
	}