cmd/compile: move Linksym, linksymname, and isblanksym to types package

Response to code review feedback on CL 40693.

This CL was prepared by:

(1) manually adding new implementations and the Ctxt var to package types

(2) running eg with template:

func before(s *types.Sym) *obj.LSym { return gc.Linksym(s) }
func after(s *types.Sym) *obj.LSym  { return s.Linksym() }

(3) running gofmt -r:

gofmt -r 'isblanksym(a) -> a.IsBlank()'

(4) manually removing old implementations from package gc

Passes toolstash-check.

Change-Id: I39c35def7cae5bcbcc7c77253e5d2b066b981dea
Reviewed-on: https://go-review.googlesource.com/41302
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/compile/internal/amd64/ggen.go

@@ -127,7 +127,7 @@ func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	if gc.Widthptr == 4 {
 		op = x86.AMOVL
 	}
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	for i := int64(0); i < size; i += int64(gc.Widthptr) {
 		p := pp.Prog(op)

src/cmd/compile/internal/arm/ggen.go

@@ -49,7 +49,7 @@ func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, r0 *uint32) *obj.Prog
 
 func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	// Note: this code must not clobber any registers.
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	p := pp.Prog(arm.AMOVW)
 	p.From.Type = obj.TYPE_CONST

src/cmd/compile/internal/arm64/ggen.go

@@ -60,7 +60,7 @@ func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
 
 func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	// Note: this code must not clobber any registers.
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	for i := int64(0); i < size; i += 8 {
 		p := pp.Prog(arm64.AMOVD)

src/cmd/compile/internal/gc/alg.go

@@ -157,7 +157,7 @@ func algtype1(t *types.Type) (AlgKind, *types.Type) {
 		fields := t.FieldSlice()
 
 		// One-field struct is same as that one field alone.
-		if len(fields) == 1 && !isblanksym(fields[0].Sym) {
+		if len(fields) == 1 && !fields[0].Sym.IsBlank() {
 			return algtype1(fields[0].Type)
 		}
 
@@ -171,7 +171,7 @@ func algtype1(t *types.Type) (AlgKind, *types.Type) {
 
 			// Blank fields, padded fields, fields with non-memory
 			// equality need special compare.
-			if a != AMEM || isblanksym(f.Sym) || ispaddedfield(t, i) {
+			if a != AMEM || f.Sym.IsBlank() || ispaddedfield(t, i) {
 				ret = ASPECIAL
 			}
 		}
@@ -247,7 +247,7 @@ func genhash(sym *types.Sym, t *types.Type) {
 			f := fields[i]
 
 			// Skip blank fields.
-			if isblanksym(f.Sym) {
+			if f.Sym.IsBlank() {
 				i++
 				continue
 			}
@@ -435,7 +435,7 @@ func geneq(sym *types.Sym, t *types.Type) {
 			f := fields[i]
 
 			// Skip blank-named fields.
-			if isblanksym(f.Sym) {
+			if f.Sym.IsBlank() {
 				i++
 				continue
 			}
@@ -568,7 +568,7 @@ func memrun(t *types.Type, start int) (size int64, next int) {
 			break
 		}
 		// Also, stop before a blank or non-memory field.
-		if f := t.Field(next); isblanksym(f.Sym) || !IsRegularMemory(f.Type) {
+		if f := t.Field(next); f.Sym.IsBlank() || !IsRegularMemory(f.Type) {
 			break
 		}
 	}

src/cmd/compile/internal/gc/dcl.go

@@ -607,7 +607,7 @@ func checkdupfields(what string, ts ...*types.Type) {
 	seen := make(map[*types.Sym]bool)
 	for _, t := range ts {
 		for _, f := range t.Fields().Slice() {
-			if f.Sym == nil || isblanksym(f.Sym) || asNode(f.Nname) == nil {
+			if f.Sym == nil || f.Sym.IsBlank() || asNode(f.Nname) == nil {
 				continue
 			}
 			if seen[f.Sym] {
@@ -935,7 +935,7 @@ func methodname(s *types.Sym, recv *types.Type) *types.Sym {
 	}
 
 	tsym := recv.Sym
-	if tsym == nil || isblanksym(s) {
+	if tsym == nil || s.IsBlank() {
 		return s
 	}
 
@@ -1000,7 +1000,7 @@ func addmethod(msym *types.Sym, t *types.Type, local, nointerface bool) {
 		return
 	}
 
-	if isblanksym(msym) {
+	if msym.IsBlank() {
 		return
 	}
 
@@ -1087,7 +1087,7 @@ func makefuncsym(s *types.Sym) {
 	if !Ctxt.Flag_dynlink {
 		Fatalf("makefuncsym dynlink")
 	}
-	if isblanksym(s) {
+	if s.IsBlank() {
 		return
 	}
 	if compiling_runtime && s.Name == "getg" {

src/cmd/compile/internal/gc/esc.go

@@ -2109,7 +2109,7 @@ func (e *EscState) esctag(fn *Node) {
 	// (Unnamed parameters are not in the Dcl list in the loop above
 	// so we need to mark them separately.)
 	for _, f := range fn.Type.Params().Fields().Slice() {
-		if f.Sym == nil || isblanksym(f.Sym) {
+		if f.Sym == nil || f.Sym.IsBlank() {
 			f.Note = mktag(EscNone)
 		}
 	}

src/cmd/compile/internal/gc/export.go

@@ -301,7 +301,7 @@ func dumpasmhdr() {
 	}
 	fmt.Fprintf(b, "// generated by compile -asmhdr from package %s\n\n", localpkg.Name)
 	for _, n := range asmlist {
-		if isblanksym(n.Sym) {
+		if n.Sym.IsBlank() {
 			continue
 		}
 		switch n.Op {
@@ -315,7 +315,7 @@ func dumpasmhdr() {
 			}
 			fmt.Fprintf(b, "#define %s__size %d\n", t.Sym.Name, int(t.Width))
 			for _, t := range t.Fields().Slice() {
-				if !isblanksym(t.Sym) {
+				if !t.Sym.IsBlank() {
 					fmt.Fprintf(b, "#define %s_%s %d\n", n.Sym.Name, t.Sym.Name, int(t.Offset))
 				}
 			}

src/cmd/compile/internal/gc/gen.go

@@ -15,7 +15,7 @@ import (
 )
 
 func Sysfunc(name string) *obj.LSym {
-	return Linksym(Runtimepkg.Lookup(name))
+	return Runtimepkg.Lookup(name).Linksym()
 }
 
 // addrescapes tags node n as having had its address taken

src/cmd/compile/internal/gc/gsubr.go

@@ -173,7 +173,7 @@ func (f *Func) initLSym() {
 	}
 
 	if nam := f.Nname; !isblank(nam) {
-		f.lsym = Linksym(nam.Sym)
+		f.lsym = nam.Sym.Linksym()
 		if f.Pragma&Systemstack != 0 {
 			f.lsym.Set(obj.AttrCFunc, true)
 		}
@@ -213,8 +213,8 @@ func (f *Func) initLSym() {
 }
 
 func ggloblnod(nam *Node) {
-	s := Linksym(nam.Sym)
-	s.Gotype = Linksym(ngotype(nam))
+	s := nam.Sym.Linksym()
+	s.Gotype = ngotype(nam).Linksym()
 	flags := 0
 	if nam.Name.Readonly() {
 		flags = obj.RODATA
@@ -226,7 +226,7 @@ func ggloblnod(nam *Node) {
 }
 
 func ggloblsym(s *types.Sym, width int32, flags int16) {
-	ggloblLSym(Linksym(s), width, flags)
+	ggloblLSym(s.Linksym(), width, flags)
 }
 
 func ggloblLSym(s *obj.LSym, width int32, flags int16) {
@@ -316,7 +316,7 @@ func nodarg(t interface{}, fp int) *Node {
 			}
 
 			for _, n := range Curfn.Func.Dcl {
-				if (n.Class == PPARAM || n.Class == PPARAMOUT) && !isblanksym(t.Sym) && n.Sym == t.Sym {
+				if (n.Class == PPARAM || n.Class == PPARAMOUT) && !t.Sym.IsBlank() && n.Sym == t.Sym {
 					if n != expect {
 						Fatalf("nodarg: unexpected node: %v (%p %v) vs %v (%p %v)", n, n, n.Op, asNode(t.Nname), asNode(t.Nname), asNode(t.Nname).Op)
 					}
@@ -324,7 +324,7 @@ func nodarg(t interface{}, fp int) *Node {
 				}
 			}
 
-			if !isblanksym(expect.Sym) {
+			if !expect.Sym.IsBlank() {
 				Fatalf("nodarg: did not find node in dcl list: %v", expect)
 			}
 		}

src/cmd/compile/internal/gc/inl.go

@@ -762,7 +762,7 @@ func mkinlcall1(n *Node, fn *Node, isddd bool) *Node {
 	if callBase != nil {
 		parent = callBase.InliningIndex()
 	}
-	newIndex := Ctxt.InlTree.Add(parent, n.Pos, Linksym(fn.Sym))
+	newIndex := Ctxt.InlTree.Add(parent, n.Pos, fn.Sym.Linksym())
 	setpos := &setPos{
 		bases:       make(map[*src.PosBase]*src.PosBase),
 		newInlIndex: newIndex,

src/cmd/compile/internal/gc/main.go

@@ -361,11 +361,12 @@ func Main(archInit func(*Arch)) {
 		return f.Sym.Name
 	}
 	types.TypeLinkSym = func(t *types.Type) *obj.LSym {
-		return Linksym(typenamesym(t))
+		return typenamesym(t).Linksym()
 	}
 	types.FmtLeft = int(FmtLeft)
 	types.FmtUnsigned = int(FmtUnsigned)
 	types.FErr = FErr
+	types.Ctxt = Ctxt
 
 	initUniverse()
 

src/cmd/compile/internal/gc/obj.go

@@ -251,28 +251,8 @@ func addGCLocals() {
 	}
 }
 
-func linksymname(s *types.Sym) string {
-	if isblanksym(s) {
-		return "_"
-	}
-	if s.Linkname != "" {
-		return s.Linkname
-	}
-	return s.Pkg.Prefix + "." + s.Name
-}
-
-func Linksym(s *types.Sym) *obj.LSym {
-	if s == nil {
-		return nil
-	}
-	if s.Lsym == nil {
-		s.Lsym = Ctxt.Lookup(linksymname(s))
-	}
-	return s.Lsym
-}
-
 func duintxx(s *types.Sym, off int, v uint64, wid int) int {
-	return duintxxLSym(Linksym(s), off, v, wid)
+	return duintxxLSym(s.Linksym(), off, v, wid)
 }
 
 func duintxxLSym(s *obj.LSym, off int, v uint64, wid int) int {
@@ -369,7 +349,7 @@ func slicebytes(nam *Node, s string, len int) {
 }
 
 func dsname(s *types.Sym, off int, t string) int {
-	return dsnameLSym(Linksym(s), off, t)
+	return dsnameLSym(s.Linksym(), off, t)
 }
 
 func dsnameLSym(s *obj.LSym, off int, t string) int {
@@ -378,7 +358,7 @@ func dsnameLSym(s *obj.LSym, off int, t string) int {
 }
 
 func dsymptr(s *types.Sym, off int, x *types.Sym, xoff int) int {
-	return dsymptrLSym(Linksym(s), off, Linksym(x), xoff)
+	return dsymptrLSym(s.Linksym(), off, x.Linksym(), xoff)
 }
 
 func dsymptrLSym(s *obj.LSym, off int, x *obj.LSym, xoff int) int {
@@ -407,7 +387,7 @@ func gdata(nam *Node, nr *Node, wid int) {
 	if nam.Sym == nil {
 		Fatalf("gdata nil nam sym")
 	}
-	s := Linksym(nam.Sym)
+	s := nam.Sym.Linksym()
 
 	switch nr.Op {
 	case OLITERAL:
@@ -454,13 +434,13 @@ func gdata(nam *Node, nr *Node, wid int) {
 			Fatalf("gdata ADDR left op %v", nr.Left.Op)
 		}
 		to := nr.Left
-		s.WriteAddr(Ctxt, nam.Xoffset, wid, Linksym(to.Sym), to.Xoffset)
+		s.WriteAddr(Ctxt, nam.Xoffset, wid, to.Sym.Linksym(), to.Xoffset)
 
 	case ONAME:
 		if nr.Class != PFUNC {
 			Fatalf("gdata NAME not PFUNC %d", nr.Class)
 		}
-		s.WriteAddr(Ctxt, nam.Xoffset, wid, Linksym(funcsym(nr.Sym)), nr.Xoffset)
+		s.WriteAddr(Ctxt, nam.Xoffset, wid, funcsym(nr.Sym).Linksym(), nr.Xoffset)
 
 	default:
 		Fatalf("gdata unhandled op %v %v\n", nr, nr.Op)

src/cmd/compile/internal/gc/pgen.go

@@ -23,7 +23,7 @@ func emitptrargsmap() {
 		return
 	}
 	sym := lookup(fmt.Sprintf("%s.args_stackmap", Curfn.Func.Nname.Sym.Name))
-	lsym := Linksym(sym)
+	lsym := sym.Linksym()
 
 	nptr := int(Curfn.Type.ArgWidth() / int64(Widthptr))
 	bv := bvalloc(int32(nptr) * 2)
@@ -223,7 +223,7 @@ func compile(fn *Node) {
 
 func debuginfo(fnsym *obj.LSym, curfn interface{}) []*dwarf.Var {
 	fn := curfn.(*Node)
-	if expect := Linksym(fn.Func.Nname.Sym); fnsym != expect {
+	if expect := fn.Func.Nname.Sym.Linksym(); fnsym != expect {
 		Fatalf("unexpected fnsym: %v != %v", fnsym, expect)
 	}
 
@@ -262,7 +262,7 @@ func debuginfo(fnsym *obj.LSym, curfn interface{}) []*dwarf.Var {
 			continue
 		}
 
-		gotype := Linksym(ngotype(n))
+		gotype := ngotype(n).Linksym()
 		fnsym.Func.Autom = append(fnsym.Func.Autom, &obj.Auto{
 			Asym:    Ctxt.Lookup(n.Sym.Name),
 			Aoffset: int32(n.Xoffset),
@@ -306,7 +306,7 @@ func fieldtrack(fnsym *obj.LSym, tracked map[*types.Sym]struct{}) {
 	sort.Sort(symByName(trackSyms))
 	for _, sym := range trackSyms {
 		r := obj.Addrel(fnsym)
-		r.Sym = Linksym(sym)
+		r.Sym = sym.Linksym()
 		r.Type = objabi.R_USEFIELD
 	}
 }

src/cmd/compile/internal/gc/reflect.go

@@ -409,7 +409,7 @@ func imethods(t *types.Type) []*Sig {
 		methods = append(methods, &sig)
 
 		// Compiler can only refer to wrappers for non-blank methods.
-		if isblanksym(method) {
+		if method.IsBlank() {
 			continue
 		}
 
@@ -454,7 +454,7 @@ func dimportpath(p *types.Pkg) {
 }
 
 func dgopkgpath(s *types.Sym, ot int, pkg *types.Pkg) int {
-	return dgopkgpathLSym(Linksym(s), ot, pkg)
+	return dgopkgpathLSym(s.Linksym(), ot, pkg)
 }
 
 func dgopkgpathLSym(s *obj.LSym, ot int, pkg *types.Pkg) int {
@@ -521,7 +521,7 @@ func dnameField(s *types.Sym, ot int, spkg *types.Pkg, ft *types.Field) int {
 		fpkg = nil
 	}
 	nsym := dname(name, ft.Note, fpkg, isExported)
-	return dsymptrLSym(Linksym(s), ot, nsym, 0)
+	return dsymptrLSym(s.Linksym(), ot, nsym, 0)
 }
 
 // dnameData writes the contents of a reflect.name into s at offset ot.
@@ -617,7 +617,7 @@ func dextratype(s *types.Sym, ot int, t *types.Type, dataAdd int) int {
 		dtypesym(a.type_)
 	}
 
-	ot = dgopkgpathOffLSym(Linksym(s), ot, typePkg(t))
+	ot = dgopkgpathOffLSym(s.Linksym(), ot, typePkg(t))
 
 	dataAdd += uncommonSize(t)
 	mcount := len(m)
@@ -654,7 +654,7 @@ func typePkg(t *types.Type) *types.Pkg {
 // dextratypeData dumps the backing array for the []method field of
 // runtime.uncommontype.
 func dextratypeData(s *types.Sym, ot int, t *types.Type) int {
-	lsym := Linksym(s)
+	lsym := s.Linksym()
 	for _, a := range methods(t) {
 		// ../../../../runtime/type.go:/method
 		exported := exportname(a.name)
@@ -665,9 +665,9 @@ func dextratypeData(s *types.Sym, ot int, t *types.Type) int {
 		nsym := dname(a.name, "", pkg, exported)
 
 		ot = dsymptrOffLSym(lsym, ot, nsym, 0)
-		ot = dmethodptrOffLSym(lsym, ot, Linksym(dtypesym(a.mtype)))
-		ot = dmethodptrOffLSym(lsym, ot, Linksym(a.isym))
-		ot = dmethodptrOffLSym(lsym, ot, Linksym(a.tsym))
+		ot = dmethodptrOffLSym(lsym, ot, dtypesym(a.mtype).Linksym())
+		ot = dmethodptrOffLSym(lsym, ot, a.isym.Linksym())
+		ot = dmethodptrOffLSym(lsym, ot, a.tsym.Linksym())
 	}
 	return ot
 }
@@ -885,14 +885,14 @@ func dcommontype(s *types.Sym, ot int, t *types.Type) int {
 	ot = dsymptr(s, ot, gcsym, 0) // gcdata
 
 	nsym := dname(p, "", nil, exported)
-	ot = dsymptrOffLSym(Linksym(s), ot, nsym, 0) // str
+	ot = dsymptrOffLSym(s.Linksym(), ot, nsym, 0) // str
 	// ptrToThis
 	if sptr == nil {
 		ot = duint32(s, ot, 0)
 	} else if sptrWeak {
-		ot = dsymptrWeakOffLSym(Linksym(s), ot, Linksym(sptr))
+		ot = dsymptrWeakOffLSym(s.Linksym(), ot, sptr.Linksym())
 	} else {
-		ot = dsymptrOffLSym(Linksym(s), ot, Linksym(sptr), 0)
+		ot = dsymptrOffLSym(s.Linksym(), ot, sptr.Linksym(), 0)
 	}
 
 	return ot
@@ -1209,7 +1209,7 @@ ok:
 		dataAdd := imethodSize() * n
 		ot = dextratype(s, ot, t, dataAdd)
 
-		lsym := Linksym(s)
+		lsym := s.Linksym()
 		for _, a := range m {
 			// ../../../../runtime/type.go:/imethod
 			exported := exportname(a.name)
@@ -1220,7 +1220,7 @@ ok:
 			nsym := dname(a.name, "", pkg, exported)
 
 			ot = dsymptrOffLSym(lsym, ot, nsym, 0)
-			ot = dsymptrOffLSym(lsym, ot, Linksym(dtypesym(a.type_)), 0)
+			ot = dsymptrOffLSym(lsym, ot, dtypesym(a.type_).Linksym(), 0)
 		}
 
 	// ../../../../runtime/type.go:/mapType
@@ -1352,7 +1352,7 @@ func peekitabs() {
 		if len(methods) == 0 {
 			continue
 		}
-		tab.lsym = Linksym(tab.sym)
+		tab.lsym = tab.sym.Linksym()
 		tab.entries = methods
 	}
 }
@@ -1375,7 +1375,7 @@ func genfun(t, it *types.Type) []*obj.LSym {
 	// so we can find the intersect in a single pass
 	for _, m := range methods {
 		if m.name == sigs[0].name {
-			out = append(out, Linksym(m.isym))
+			out = append(out, m.isym.Linksym())
 			sigs = sigs[1:]
 			if len(sigs) == 0 {
 				break
@@ -1488,14 +1488,14 @@ func dumptypestructs() {
 			// }
 			nsym := dname(p.s.Name, "", nil, true)
 			ot = dsymptrOffLSym(s, ot, nsym, 0)
-			ot = dsymptrOffLSym(s, ot, Linksym(dtypesym(p.t)), 0)
+			ot = dsymptrOffLSym(s, ot, dtypesym(p.t).Linksym(), 0)
 		}
 		ggloblLSym(s, int32(ot), int16(obj.RODATA))
 
 		ot = 0
 		s = Ctxt.Lookup("go.plugin.exports")
 		for _, p := range ptabs {
-			ot = dsymptrLSym(s, ot, Linksym(p.s), 0)
+			ot = dsymptrLSym(s, ot, p.s.Linksym(), 0)
 		}
 		ggloblLSym(s, int32(ot), int16(obj.RODATA))
 	}

src/cmd/compile/internal/gc/sinit.go

@@ -725,7 +725,7 @@ func fixedlit(ctxt initContext, kind initKind, n *Node, var_ *Node, init *Nodes)
 			if r.Op != OSTRUCTKEY {
 				Fatalf("fixedlit: rhs not OSTRUCTKEY: %v", r)
 			}
-			if isblanksym(r.Sym) {
+			if r.Sym.IsBlank() {
 				return nblank, r.Left
 			}
 			return nodSym(ODOT, var_, r.Sym), r.Left

src/cmd/compile/internal/gc/ssa.go

@@ -762,7 +762,7 @@ func (s *state) stmt(n *Node) {
 		s.stmtList(n.List)
 		b := s.exit()
 		b.Kind = ssa.BlockRetJmp // override BlockRet
-		b.Aux = Linksym(n.Left.Sym)
+		b.Aux = n.Left.Sym.Linksym()
 
 	case OCONTINUE, OBREAK:
 		var to *ssa.Block
@@ -1387,12 +1387,12 @@ func (s *state) expr(n *Node) *ssa.Value {
 		len := s.newValue1(ssa.OpStringLen, types.Types[TINT], str)
 		return s.newValue3(ssa.OpSliceMake, n.Type, ptr, len, len)
 	case OCFUNC:
-		aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: Linksym(n.Left.Sym)})
+		aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: n.Left.Sym.Linksym()})
 		return s.entryNewValue1A(ssa.OpAddr, n.Type, aux, s.sb)
 	case ONAME:
 		if n.Class == PFUNC {
 			// "value" of a function is the address of the function's closure
-			sym := Linksym(funcsym(n.Sym))
+			sym := funcsym(n.Sym).Linksym()
 			aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: sym})
 			return s.entryNewValue1A(ssa.OpAddr, types.NewPtr(n.Type), aux, s.sb)
 		}
@@ -2833,7 +2833,7 @@ func init() {
 		sys.ARM64)
 	makeOnesCount := func(op64 ssa.Op, op32 ssa.Op) func(s *state, n *Node, args []*ssa.Value) *ssa.Value {
 		return func(s *state, n *Node, args []*ssa.Value) *ssa.Value {
-			aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: Linksym(syslook("support_popcnt").Sym)})
+			aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: syslook("support_popcnt").Sym.Linksym()})
 			addr := s.entryNewValue1A(ssa.OpAddr, types.Types[TBOOL].PtrTo(), aux, s.sb)
 			v := s.newValue2(ssa.OpLoad, types.Types[TBOOL], addr, s.mem())
 			b := s.endBlock()
@@ -3131,7 +3131,7 @@ func (s *state) call(n *Node, k callKind) *ssa.Value {
 	case codeptr != nil:
 		call = s.newValue2(ssa.OpInterCall, ssa.TypeMem, codeptr, s.mem())
 	case sym != nil:
-		call = s.newValue1A(ssa.OpStaticCall, ssa.TypeMem, Linksym(sym), s.mem())
+		call = s.newValue1A(ssa.OpStaticCall, ssa.TypeMem, sym.Linksym(), s.mem())
 	default:
 		Fatalf("bad call type %v %v", n.Op, n)
 	}
@@ -3204,7 +3204,7 @@ func (s *state) addr(n *Node, bounded bool) *ssa.Value {
 		switch n.Class {
 		case PEXTERN:
 			// global variable
-			aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: Linksym(n.Sym)})
+			aux := s.lookupSymbol(n, &ssa.ExternSymbol{Sym: n.Sym.Linksym()})
 			v := s.entryNewValue1A(ssa.OpAddr, t, aux, s.sb)
 			// TODO: Make OpAddr use AuxInt as well as Aux.
 			if n.Xoffset != 0 {
@@ -4599,12 +4599,12 @@ func AddAux2(a *obj.Addr, v *ssa.Value, offset int64) {
 	case *ssa.ArgSymbol:
 		n := sym.Node.(*Node)
 		a.Name = obj.NAME_PARAM
-		a.Sym = Linksym(n.Orig.Sym)
+		a.Sym = n.Orig.Sym.Linksym()
 		a.Offset += n.Xoffset
 	case *ssa.AutoSymbol:
 		n := sym.Node.(*Node)
 		a.Name = obj.NAME_AUTO
-		a.Sym = Linksym(n.Sym)
+		a.Sym = n.Sym.Linksym()
 		a.Offset += n.Xoffset
 	default:
 		v.Fatalf("aux in %s not implemented %#v", v, v.Aux)
@@ -4706,7 +4706,7 @@ func AutoVar(v *ssa.Value) (*Node, int64) {
 func AddrAuto(a *obj.Addr, v *ssa.Value) {
 	n, off := AutoVar(v)
 	a.Type = obj.TYPE_MEM
-	a.Sym = Linksym(n.Sym)
+	a.Sym = n.Sym.Linksym()
 	a.Reg = int16(thearch.REGSP)
 	a.Offset = n.Xoffset + off
 	if n.Class == PPARAM || n.Class == PPARAMOUT {
@@ -4722,7 +4722,7 @@ func (s *SSAGenState) AddrScratch(a *obj.Addr) {
 	}
 	a.Type = obj.TYPE_MEM
 	a.Name = obj.NAME_AUTO
-	a.Sym = Linksym(s.ScratchFpMem.Sym)
+	a.Sym = s.ScratchFpMem.Sym.Linksym()
 	a.Reg = int16(thearch.REGSP)
 	a.Offset = s.ScratchFpMem.Xoffset
 }

src/cmd/compile/internal/gc/subr.go

@@ -510,11 +510,7 @@ func isblank(n *Node) bool {
 	if n == nil {
 		return false
 	}
-	return isblanksym(n.Sym)
-}
-
-func isblanksym(s *types.Sym) bool {
-	return s != nil && s.Name == "_"
+	return n.Sym.IsBlank()
 }
 
 // methtype returns the underlying type, if any,

src/cmd/compile/internal/gc/typecheck.go

@@ -901,7 +901,7 @@ OpSwitch:
 			checkwidth(t)
 		}
 
-		if isblanksym(n.Sym) {
+		if n.Sym.IsBlank() {
 			yyerror("cannot refer to blank field or method")
 			n.Type = nil
 			return n
@@ -2010,7 +2010,7 @@ OpSwitch:
 	case OLABEL:
 		ok |= Etop
 		decldepth++
-		if isblanksym(n.Left.Sym) {
+		if n.Left.Sym.IsBlank() {
 			// Empty identifier is valid but useless.
 			// Eliminate now to simplify life later.
 			// See issues 7538, 11589, 11593.
@@ -3097,7 +3097,7 @@ func typecheckcomplit(n *Node) *Node {
 					// the field to the right of the dot,
 					// so s will be non-nil, but an OXDOT
 					// is never a valid struct literal key.
-					if key.Sym == nil || key.Op == OXDOT || isblanksym(key.Sym) {
+					if key.Sym == nil || key.Op == OXDOT || key.Sym.IsBlank() {
 						yyerror("invalid field name %v in struct initializer", key)
 						l.Left = typecheck(l.Left, Erv)
 						continue

src/cmd/compile/internal/gc/walk.go

@@ -3202,7 +3202,7 @@ func walkcompare(n *Node, init *Nodes) *Node {
 	if t.IsStruct() {
 		for _, f := range t.Fields().Slice() {
 			sym := f.Sym
-			if isblanksym(sym) {
+			if sym.IsBlank() {
 				continue
 			}
 			compare(

src/cmd/compile/internal/mips/ggen.go

@@ -45,7 +45,7 @@ func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
 
 func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	// Note: this code must not clobber any registers.
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	for i := int64(0); i < size; i += 4 {
 		p := pp.Prog(mips.AMOVW)

src/cmd/compile/internal/mips64/ggen.go

@@ -49,7 +49,7 @@ func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
 
 func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	// Note: this code must not clobber any registers.
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	for i := int64(0); i < size; i += 8 {
 		p := pp.Prog(mips.AMOVV)

src/cmd/compile/internal/ppc64/ggen.go

@@ -44,7 +44,7 @@ func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
 
 func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	// Note: this code must not clobber any registers.
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	for i := int64(0); i < size; i += 8 {
 		p := pp.Prog(ppc64.AMOVD)

src/cmd/compile/internal/s390x/ggen.go

@@ -102,7 +102,7 @@ func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	p.To.Name = obj.NAME_AUTO
 	p.To.Reg = s390x.REGSP
 	p.To.Offset = n.Xoffset
-	p.To.Sym = gc.Linksym(n.Sym)
+	p.To.Sym = n.Sym.Linksym()
 }
 
 func ginsnop(pp *gc.Progs) {

src/cmd/compile/internal/types/sym.go

@@ -59,3 +59,27 @@ func (sym *Sym) SetUniq(b bool)     { sym.flags.set(symUniq, b) }
 func (sym *Sym) SetSiggen(b bool)   { sym.flags.set(symSiggen, b) }
 func (sym *Sym) SetAsm(b bool)      { sym.flags.set(symAsm, b) }
 func (sym *Sym) SetAlgGen(b bool)   { sym.flags.set(symAlgGen, b) }
+
+func (sym *Sym) IsBlank() bool {
+	return sym != nil && sym.Name == "_"
+}
+
+func (sym *Sym) LinksymName() string {
+	if sym.IsBlank() {
+		return "_"
+	}
+	if sym.Linkname != "" {
+		return sym.Linkname
+	}
+	return sym.Pkg.Prefix + "." + sym.Name
+}
+
+func (sym *Sym) Linksym() *obj.LSym {
+	if sym == nil {
+		return nil
+	}
+	if sym.Lsym == nil {
+		sym.Lsym = Ctxt.Lookup(sym.LinksymName())
+	}
+	return sym.Lsym
+}

src/cmd/compile/internal/types/utils.go

@@ -27,6 +27,7 @@ var (
 	FormatType  func(*Type, fmt.State, rune, int) // orig: func typeFormat(t *Type, s fmt.State, verb rune, mode fmtMode)
 	FieldName   func(*Field) string
 	TypeLinkSym func(*Type) *obj.LSym
+	Ctxt        *obj.Link
 
 	FmtLeft     int
 	FmtUnsigned int

src/cmd/compile/internal/x86/ggen.go

@@ -39,7 +39,7 @@ func zerorange(pp *gc.Progs, p *obj.Prog, off, cnt int64, ax *uint32) *obj.Prog
 
 func zeroAuto(pp *gc.Progs, n *gc.Node) {
 	// Note: this code must not clobber any registers.
-	sym := gc.Linksym(n.Sym)
+	sym := n.Sym.Linksym()
 	size := n.Type.Size()
 	for i := int64(0); i < size; i += 4 {
 		p := pp.Prog(x86.AMOVL)