// recorded in expanding.inst.ctxt.
	var ctxts []*Context
	if expanding != nil {
		ctxts = append(ctxts, expanding.inst.ctxt)
	}
	if ctxt != nil {
		ctxts = append(ctxts, ctxt)
	}
	assert(len(ctxts) > 0)

	// Compute all hashes; hashes may differ across contexts due to different
	// unique IDs for Named types within the hasher.
	hashes := make([]string, len(ctxts))
	for i, ctxt := range ctxts {

}

// determineLinkMode sets ctxt.LinkMode.
//
// It is called after flags are processed and inputs are processed,
// so the ctxt.LinkMode variable has an initial value from the -linkmode
// flag and the iscgo, externalobj, and unknownObjFormat variables are set.
func determineLinkMode(ctxt *Link) {
	extNeeded, extReason := mustLinkExternal(ctxt)
	via := ""

	if ctxt.LinkMode == LinkAuto {

	}
	varSym.NewVarInfo().dwarfInfoSym = dieSym
	ctxt.Data = append(ctxt.Data, dieSym)
	typeSym := ctxt.Lookup(dwarf.InfoPrefix + typename)
	dwarf.PutGlobal(dwCtxt{ctxt}, dieSym, typeSym, varSym, varname)
}

func (ctxt *Link) DwarfAbstractFunc(curfn Func, s *LSym) {
	absfn := ctxt.DwFixups.AbsFuncDwarfSym(s)
	if absfn.Size != 0 {
		ctxt.Diag("internal error: DwarfAbstractFunc double process %v", s)
	}

	bench.Start("mangleTypeSym")
	ctxt.mangleTypeSym()

	if ctxt.IsELF {
		bench.Start("doelf")
		ctxt.doelf()
	}
	if ctxt.IsDarwin() {
		bench.Start("domacho")
		ctxt.domacho()
	}
	if ctxt.IsWindows() {
		bench.Start("dope")
		ctxt.dope()
		bench.Start("windynrelocsyms")
		ctxt.windynrelocsyms()
	}
	if ctxt.IsAIX() {
		bench.Start("doxcoff")
		ctxt.doxcoff()
	}

	/* Writing */
	ctxt.Out.SeekSet(int64(globalOff))
	binary.Write(ctxt.Out, ctxt.Arch.ByteOrder, hdr)

	for _, s := range symtab {
		binary.Write(ctxt.Out, ctxt.Arch.ByteOrder, s)

	}
	for _, r := range reloctab {
		binary.Write(ctxt.Out, ctxt.Arch.ByteOrder, r)
	}
	for _, f := range importtab {
		ctxt.Out.WriteString(f.Limpidpath)
		ctxt.Out.Write8(0)

	"cmd/link/internal/sym"
)

var sehp struct {
	pdata []sym.LoaderSym
	xdata []sym.LoaderSym
}

func writeSEH(ctxt *Link) {
	switch ctxt.Arch.Family {
	case sys.AMD64:
		writeSEHAMD64(ctxt)
	}
}

func writeSEHAMD64(ctxt *Link) {
	ldr := ctxt.loader
	mkSecSym := func(name string, kind sym.SymKind) *loader.SymbolBuilder {
		s := ldr.CreateSymForUpdate(name, 0)
		s.SetType(kind)

			stub.SetUint32(ctxt.Arch, stub.Size()-4, OP_PLD_SFX_R12) // pld r12, targ@plt
		} else if !isLinkingPIC(ctxt) {
			// This stub doesn't need to be PIC. Load targ address from the PLT via its absolute address.
			stub.AddSymRef(ctxt.Arch, plt, int64(ldr.SymPlt(targ)), objabi.R_ADDRPOWER_DS, 8)
			stub.SetUint32(ctxt.Arch, stub.Size()-8, OP_LIS_R12)    // lis r12,targ@plt@ha

	if ctxt.IsElf() {
		ctxt.mkArchSym(".rel", 0, &ctxt.Rel)
		ctxt.mkArchSym(".rela", 0, &ctxt.Rela)
		ctxt.mkArchSym(".rel.plt", 0, &ctxt.RelPLT)
		ctxt.mkArchSym(".rela.plt", 0, &ctxt.RelaPLT)
	}
	if ctxt.IsDarwin() {
		ctxt.mkArchSym(".linkedit.got", 0, &ctxt.LinkEditGOT)
		ctxt.mkArchSym(".linkedit.plt", 0, &ctxt.LinkEditPLT)
	}
}

type Arch struct {
	Funcalign  int
	Maxalign   int
	Minalign   int
	Dwarfregsp int

	for _, s := range text {
		mkfwd(s)
		if ctxt.Arch.ErrorCheck != nil {
			ctxt.Arch.ErrorCheck(ctxt, s)
		}
		linkpatch(ctxt, s, newprog)
		ctxt.Arch.Preprocess(ctxt, s, newprog)
		ctxt.Arch.Assemble(ctxt, s, newprog)
		if ctxt.Errors > 0 {
			continue
		}
		linkpcln(ctxt, s)
		ctxt.populateDWARF(plist.Curfn, s)
		if ctxt.Headtype == objabi.Hwindows && ctxt.Arch.SEH != nil {

	}

	for _, test := range tests {
		fileIndex, line := ctxt.getFileIndexAndLine(ctxt.PosTable.XPos(test.pos))

		file := "??"
		if fileIndex >= 0 {
			file = ctxt.PosTable.FileTable()[fileIndex]
		}
		got := fmt.Sprintf("%s:%d", file, line)

		if got != test.want {
			t.Errorf("ctxt.getFileSymbolAndLine(%v) = %q, want %q", test.pos, got, test.want)
		}
	}