[dev.regabi] cmd/compile: remove Name.Class_ accessors

These aren't part of the Node interface anymore, so no need to keep
them around.

Passes toolstash -cmp.

[git-generate]
cd src/cmd/compile/internal/ir

: Fix one off case that causes trouble for rf.
sed -i -e 's/n.SetClass(ir.PAUTO)/n.Class_ = ir.PAUTO/' ../ssa/export_test.go

pkgs=$(go list . ../...)
rf '
	ex '"$(echo $pkgs)"' {
		var n *Name
		var c Class
		n.Class() -> n.Class_
		n.SetClass(c) -> n.Class_ = c
	}

	rm Name.Class
	rm Name.SetClass
	mv Name.Class_ Name.Class
'

Change-Id: Ifb304bf4691a8c455456aabd8aa77178d4a49500
Reviewed-on: https://go-review.googlesource.com/c/go/+/281294
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>

41 files changed, 149 insertions, 151 deletions

diff --git a/src/cmd/compile/internal/dwarfgen/dwarf.go b/src/cmd/compile/internal/dwarfgen/dwarf.go
index 6eac9d547e..1534adaac8 100644
--- a/src/cmd/compile/internal/dwarfgen/dwarf.go
+++ b/src/cmd/compile/internal/dwarfgen/dwarf.go
@@ -76,7 +76,7 @@ func Info(fnsym *obj.LSym, infosym *obj.LSym, curfn interface{}) ([]dwarf.Scope,
 			if n.Op() != ir.ONAME { // might be OTYPE or OLITERAL
 				continue
 			}
-			switch n.Class_ {
+			switch n.Class {
 			case ir.PAUTO:
 				if !n.Used() {
 					// Text == nil -> generating abstract function
@@ -171,7 +171,7 @@ func createDwarfVars(fnsym *obj.LSym, complexOK bool, fn *ir.Func, apDecls []*ir
 		if c == '.' || n.Type().IsUntyped() {
 			continue
 		}
-		if n.Class_ == ir.PPARAM && !ssagen.TypeOK(n.Type()) {
+		if n.Class == ir.PPARAM && !ssagen.TypeOK(n.Type()) {
 			// SSA-able args get location lists, and may move in and
 			// out of registers, so those are handled elsewhere.
 			// Autos and named output params seem to get handled
@@ -186,10 +186,10 @@ func createDwarfVars(fnsym *obj.LSym, complexOK bool, fn *ir.Func, apDecls []*ir
 		typename := dwarf.InfoPrefix + types.TypeSymName(n.Type())
 		decls = append(decls, n)
 		abbrev := dwarf.DW_ABRV_AUTO_LOCLIST
-		isReturnValue := (n.Class_ == ir.PPARAMOUT)
-		if n.Class_ == ir.PPARAM || n.Class_ == ir.PPARAMOUT {
+		isReturnValue := (n.Class == ir.PPARAMOUT)
+		if n.Class == ir.PPARAM || n.Class == ir.PPARAMOUT {
 			abbrev = dwarf.DW_ABRV_PARAM_LOCLIST
-		} else if n.Class_ == ir.PAUTOHEAP {
+		} else if n.Class == ir.PAUTOHEAP {
 			// If dcl in question has been promoted to heap, do a bit
 			// of extra work to recover original class (auto or param);
 			// see issue 30908. This insures that we get the proper
@@ -198,9 +198,9 @@ func createDwarfVars(fnsym *obj.LSym, complexOK bool, fn *ir.Func, apDecls []*ir
 			// and not stack).
 			// TODO(thanm): generate a better location expression
 			stackcopy := n.Stackcopy
-			if stackcopy != nil && (stackcopy.Class_ == ir.PPARAM || stackcopy.Class_ == ir.PPARAMOUT) {
+			if stackcopy != nil && (stackcopy.Class == ir.PPARAM || stackcopy.Class == ir.PPARAMOUT) {
 				abbrev = dwarf.DW_ABRV_PARAM_LOCLIST
-				isReturnValue = (stackcopy.Class_ == ir.PPARAMOUT)
+				isReturnValue = (stackcopy.Class == ir.PPARAMOUT)
 			}
 		}
 		inlIndex := 0
@@ -275,7 +275,7 @@ func createSimpleVar(fnsym *obj.LSym, n *ir.Name) *dwarf.Var {
 	var abbrev int
 	var offs int64
 
-	switch n.Class_ {
+	switch n.Class {
 	case ir.PAUTO:
 		offs = n.FrameOffset()
 		abbrev = dwarf.DW_ABRV_AUTO
@@ -291,7 +291,7 @@ func createSimpleVar(fnsym *obj.LSym, n *ir.Name) *dwarf.Var {
 		abbrev = dwarf.DW_ABRV_PARAM
 		offs = n.FrameOffset() + base.Ctxt.FixedFrameSize()
 	default:
-		base.Fatalf("createSimpleVar unexpected class %v for node %v", n.Class_, n)
+		base.Fatalf("createSimpleVar unexpected class %v for node %v", n.Class, n)
 	}
 
 	typename := dwarf.InfoPrefix + types.TypeSymName(n.Type())
@@ -308,7 +308,7 @@ func createSimpleVar(fnsym *obj.LSym, n *ir.Name) *dwarf.Var {
 	declpos := base.Ctxt.InnermostPos(declPos(n))
 	return &dwarf.Var{
 		Name:          n.Sym().Name,
-		IsReturnValue: n.Class_ == ir.PPARAMOUT,
+		IsReturnValue: n.Class == ir.PPARAMOUT,
 		IsInlFormal:   n.InlFormal(),
 		Abbrev:        abbrev,
 		StackOffset:   int32(offs),
@@ -353,7 +353,7 @@ func createComplexVar(fnsym *obj.LSym, fn *ir.Func, varID ssa.VarID) *dwarf.Var
 	n := debug.Vars[varID]
 
 	var abbrev int
-	switch n.Class_ {
+	switch n.Class {
 	case ir.PAUTO:
 		abbrev = dwarf.DW_ABRV_AUTO_LOCLIST
 	case ir.PPARAM, ir.PPARAMOUT:
@@ -377,7 +377,7 @@ func createComplexVar(fnsym *obj.LSym, fn *ir.Func, varID ssa.VarID) *dwarf.Var
 	declpos := base.Ctxt.InnermostPos(n.Pos())
 	dvar := &dwarf.Var{
 		Name:          n.Sym().Name,
-		IsReturnValue: n.Class_ == ir.PPARAMOUT,
+		IsReturnValue: n.Class == ir.PPARAMOUT,
 		IsInlFormal:   n.InlFormal(),
 		Abbrev:        abbrev,
 		Type:          base.Ctxt.Lookup(typename),
diff --git a/src/cmd/compile/internal/escape/escape.go b/src/cmd/compile/internal/escape/escape.go
index 1aba0a3fd2..6a2e685fe8 100644
--- a/src/cmd/compile/internal/escape/escape.go
+++ b/src/cmd/compile/internal/escape/escape.go
@@ -519,7 +519,7 @@ func (e *escape) exprSkipInit(k hole, n ir.Node) {
 
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		if n.Class_ == ir.PFUNC || n.Class_ == ir.PEXTERN {
+		if n.Class == ir.PFUNC || n.Class == ir.PEXTERN {
 			return
 		}
 		e.flow(k, e.oldLoc(n))
@@ -791,7 +791,7 @@ func (e *escape) addr(n ir.Node) hole {
 		base.Fatalf("unexpected addr: %v", n)
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		if n.Class_ == ir.PEXTERN {
+		if n.Class == ir.PEXTERN {
 			break
 		}
 		k = e.oldLoc(n).asHole()
@@ -899,7 +899,7 @@ func (e *escape) call(ks []hole, call, where ir.Node) {
 		switch call.Op() {
 		case ir.OCALLFUNC:
 			switch v := ir.StaticValue(call.X); {
-			case v.Op() == ir.ONAME && v.(*ir.Name).Class_ == ir.PFUNC:
+			case v.Op() == ir.ONAME && v.(*ir.Name).Class == ir.PFUNC:
 				fn = v.(*ir.Name)
 			case v.Op() == ir.OCLOSURE:
 				fn = v.(*ir.ClosureExpr).Func.Nname
@@ -1589,7 +1589,7 @@ func (b *batch) finish(fns []*ir.Func) {
 }
 
 func (l *location) isName(c ir.Class) bool {
-	return l.n != nil && l.n.Op() == ir.ONAME && l.n.(*ir.Name).Class_ == c
+	return l.n != nil && l.n.Op() == ir.ONAME && l.n.(*ir.Name).Class == c
 }
 
 const numEscResults = 7
@@ -1882,7 +1882,7 @@ func HeapAllocReason(n ir.Node) string {
 	// Parameters are always passed via the stack.
 	if n.Op() == ir.ONAME {
 		n := n.(*ir.Name)
-		if n.Class_ == ir.PPARAM || n.Class_ == ir.PPARAMOUT {
+		if n.Class == ir.PPARAM || n.Class == ir.PPARAMOUT {
 			return ""
 		}
 	}
@@ -1939,7 +1939,7 @@ func addrescapes(n ir.Node) {
 
 		// if this is a tmpname (PAUTO), it was tagged by tmpname as not escaping.
 		// on PPARAM it means something different.
-		if n.Class_ == ir.PAUTO && n.Esc() == ir.EscNever {
+		if n.Class == ir.PAUTO && n.Esc() == ir.EscNever {
 			break
 		}
 
@@ -1949,7 +1949,7 @@ func addrescapes(n ir.Node) {
 			break
 		}
 
-		if n.Class_ != ir.PPARAM && n.Class_ != ir.PPARAMOUT && n.Class_ != ir.PAUTO {
+		if n.Class != ir.PPARAM && n.Class != ir.PPARAMOUT && n.Class != ir.PAUTO {
 			break
 		}
 
@@ -2003,7 +2003,7 @@ func moveToHeap(n *ir.Name) {
 	if base.Flag.CompilingRuntime {
 		base.Errorf("%v escapes to heap, not allowed in runtime", n)
 	}
-	if n.Class_ == ir.PAUTOHEAP {
+	if n.Class == ir.PAUTOHEAP {
 		ir.Dump("n", n)
 		base.Fatalf("double move to heap")
 	}
@@ -2022,7 +2022,7 @@ func moveToHeap(n *ir.Name) {
 	// Parameters have a local stack copy used at function start/end
 	// in addition to the copy in the heap that may live longer than
 	// the function.
-	if n.Class_ == ir.PPARAM || n.Class_ == ir.PPARAMOUT {
+	if n.Class == ir.PPARAM || n.Class == ir.PPARAMOUT {
 		if n.FrameOffset() == types.BADWIDTH {
 			base.Fatalf("addrescapes before param assignment")
 		}
@@ -2034,9 +2034,9 @@ func moveToHeap(n *ir.Name) {
 		stackcopy := typecheck.NewName(n.Sym())
 		stackcopy.SetType(n.Type())
 		stackcopy.SetFrameOffset(n.FrameOffset())
-		stackcopy.Class_ = n.Class_
+		stackcopy.Class = n.Class
 		stackcopy.Heapaddr = heapaddr
-		if n.Class_ == ir.PPARAMOUT {
+		if n.Class == ir.PPARAMOUT {
 			// Make sure the pointer to the heap copy is kept live throughout the function.
 			// The function could panic at any point, and then a defer could recover.
 			// Thus, we need the pointer to the heap copy always available so the
@@ -2058,7 +2058,7 @@ func moveToHeap(n *ir.Name) {
 			}
 			// Parameters are before locals, so can stop early.
 			// This limits the search even in functions with many local variables.
-			if d.Class_ == ir.PAUTO {
+			if d.Class == ir.PAUTO {
 				break
 			}
 		}
@@ -2069,7 +2069,7 @@ func moveToHeap(n *ir.Name) {
 	}
 
 	// Modify n in place so that uses of n now mean indirection of the heapaddr.
-	n.Class_ = ir.PAUTOHEAP
+	n.Class = ir.PAUTOHEAP
 	n.SetFrameOffset(0)
 	n.Heapaddr = heapaddr
 	n.SetEsc(ir.EscHeap)
diff --git a/src/cmd/compile/internal/gc/abiutilsaux_test.go b/src/cmd/compile/internal/gc/abiutilsaux_test.go
index e6590beac0..9386b554b0 100644
--- a/src/cmd/compile/internal/gc/abiutilsaux_test.go
+++ b/src/cmd/compile/internal/gc/abiutilsaux_test.go
@@ -21,7 +21,7 @@ import (
 func mkParamResultField(t *types.Type, s *types.Sym, which ir.Class) *types.Field {
 	field := types.NewField(src.NoXPos, s, t)
 	n := typecheck.NewName(s)
-	n.Class_ = which
+	n.Class = which
 	field.Nname = n
 	n.SetType(t)
 	return field
diff --git a/src/cmd/compile/internal/gc/compile.go b/src/cmd/compile/internal/gc/compile.go
index 1b3dd672f3..25b1c76737 100644
--- a/src/cmd/compile/internal/gc/compile.go
+++ b/src/cmd/compile/internal/gc/compile.go
@@ -83,7 +83,7 @@ func compile(fn *ir.Func) {
 	// because symbols must be allocated before the parallel
 	// phase of the compiler.
 	for _, n := range fn.Dcl {
-		switch n.Class_ {
+		switch n.Class {
 		case ir.PPARAM, ir.PPARAMOUT, ir.PAUTO:
 			if liveness.ShouldTrack(n) && n.Addrtaken() {
 				reflectdata.WriteType(n.Type())
diff --git a/src/cmd/compile/internal/gc/export.go b/src/cmd/compile/internal/gc/export.go
index c65c6c8335..356fcfa671 100644
--- a/src/cmd/compile/internal/gc/export.go
+++ b/src/cmd/compile/internal/gc/export.go
@@ -83,7 +83,7 @@ type exporter struct {
 func (p *exporter) markObject(n ir.Node) {
 	if n.Op() == ir.ONAME {
 		n := n.(*ir.Name)
-		if n.Class_ == ir.PFUNC {
+		if n.Class == ir.PFUNC {
 			inline.Inline_Flood(n, typecheck.Export)
 		}
 	}
diff --git a/src/cmd/compile/internal/gc/obj.go b/src/cmd/compile/internal/gc/obj.go
index 30cfac1b71..fbb2145e1b 100644
--- a/src/cmd/compile/internal/gc/obj.go
+++ b/src/cmd/compile/internal/gc/obj.go
@@ -188,7 +188,7 @@ func dumpGlobal(n *ir.Name) {
 	if n.Type() == nil {
 		base.Fatalf("external %v nil type\n", n)
 	}
-	if n.Class_ == ir.PFUNC {
+	if n.Class == ir.PFUNC {
 		return
 	}
 	if n.Sym().Pkg != types.LocalPkg {
diff --git a/src/cmd/compile/internal/inline/inl.go b/src/cmd/compile/internal/inline/inl.go
index b9b424b74d..6f5f6499ce 100644
--- a/src/cmd/compile/internal/inline/inl.go
+++ b/src/cmd/compile/internal/inline/inl.go
@@ -199,8 +199,8 @@ func Inline_Flood(n *ir.Name, exportsym func(*ir.Name)) {
 	if n == nil {
 		return
 	}
-	if n.Op() != ir.ONAME || n.Class_ != ir.PFUNC {
-		base.Fatalf("inlFlood: unexpected %v, %v, %v", n, n.Op(), n.Class_)
+	if n.Op() != ir.ONAME || n.Class != ir.PFUNC {
+		base.Fatalf("inlFlood: unexpected %v, %v, %v", n, n.Op(), n.Class)
 	}
 	fn := n.Func
 	if fn == nil {
@@ -227,7 +227,7 @@ func Inline_Flood(n *ir.Name, exportsym func(*ir.Name)) {
 
 		case ir.ONAME:
 			n := n.(*ir.Name)
-			switch n.Class_ {
+			switch n.Class {
 			case ir.PFUNC:
 				Inline_Flood(n, exportsym)
 				exportsym(n)
@@ -292,7 +292,7 @@ func (v *hairyVisitor) doNode(n ir.Node) error {
 		// runtime.throw is a "cheap call" like panic in normal code.
 		if n.X.Op() == ir.ONAME {
 			name := n.X.(*ir.Name)
-			if name.Class_ == ir.PFUNC && types.IsRuntimePkg(name.Sym().Pkg) {
+			if name.Class == ir.PFUNC && types.IsRuntimePkg(name.Sym().Pkg) {
 				fn := name.Sym().Name
 				if fn == "getcallerpc" || fn == "getcallersp" {
 					return errors.New("call to " + fn)
@@ -407,7 +407,7 @@ func (v *hairyVisitor) doNode(n ir.Node) error {
 
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		if n.Class_ == ir.PAUTO {
+		if n.Class == ir.PAUTO {
 			v.usedLocals[n] = true
 		}
 
@@ -627,7 +627,7 @@ func inlCallee(fn ir.Node) *ir.Func {
 		return n.Func
 	case ir.ONAME:
 		fn := fn.(*ir.Name)
-		if fn.Class_ == ir.PFUNC {
+		if fn.Class == ir.PFUNC {
 			return fn.Func
 		}
 	case ir.OCLOSURE:
@@ -759,7 +759,7 @@ func mkinlcall(n *ir.CallExpr, fn *ir.Func, maxCost int32, inlMap map[*ir.Func]b
 		if ln.Op() != ir.ONAME {
 			continue
 		}
-		if ln.Class_ == ir.PPARAMOUT { // return values handled below.
+		if ln.Class == ir.PPARAMOUT { // return values handled below.
 			continue
 		}
 		if ir.IsParamStackCopy(ln) { // ignore the on-stack copy of a parameter that moved to the heap
@@ -772,7 +772,7 @@ func mkinlcall(n *ir.CallExpr, fn *ir.Func, maxCost int32, inlMap map[*ir.Func]b
 		inlf := typecheck.Expr(inlvar(ln)).(*ir.Name)
 		inlvars[ln] = inlf
 		if base.Flag.GenDwarfInl > 0 {
-			if ln.Class_ == ir.PPARAM {
+			if ln.Class == ir.PPARAM {
 				inlf.Name().SetInlFormal(true)
 			} else {
 				inlf.Name().SetInlLocal(true)
@@ -975,7 +975,7 @@ func inlvar(var_ *ir.Name) *ir.Name {
 
 	n := typecheck.NewName(var_.Sym())
 	n.SetType(var_.Type())
-	n.Class_ = ir.PAUTO
+	n.Class = ir.PAUTO
 	n.SetUsed(true)
 	n.Curfn = ir.CurFunc // the calling function, not the called one
 	n.SetAddrtaken(var_.Addrtaken())
@@ -988,7 +988,7 @@ func inlvar(var_ *ir.Name) *ir.Name {
 func retvar(t *types.Field, i int) *ir.Name {
 	n := typecheck.NewName(typecheck.LookupNum("~R", i))
 	n.SetType(t.Type)
-	n.Class_ = ir.PAUTO
+	n.Class = ir.PAUTO
 	n.SetUsed(true)
 	n.Curfn = ir.CurFunc // the calling function, not the called one
 	ir.CurFunc.Dcl = append(ir.CurFunc.Dcl, n)
@@ -1000,7 +1000,7 @@ func retvar(t *types.Field, i int) *ir.Name {
 func argvar(t *types.Type, i int) ir.Node {
 	n := typecheck.NewName(typecheck.LookupNum("~arg", i))
 	n.SetType(t.Elem())
-	n.Class_ = ir.PAUTO
+	n.Class = ir.PAUTO
 	n.SetUsed(true)
 	n.Curfn = ir.CurFunc // the calling function, not the called one
 	ir.CurFunc.Dcl = append(ir.CurFunc.Dcl, n)
@@ -1170,7 +1170,7 @@ func (subst *inlsubst) updatedPos(xpos src.XPos) src.XPos {
 func pruneUnusedAutos(ll []*ir.Name, vis *hairyVisitor) []*ir.Name {
 	s := make([]*ir.Name, 0, len(ll))
 	for _, n := range ll {
-		if n.Class_ == ir.PAUTO {
+		if n.Class == ir.PAUTO {
 			if _, found := vis.usedLocals[n]; !found {
 				continue
 			}
diff --git a/src/cmd/compile/internal/ir/expr.go b/src/cmd/compile/internal/ir/expr.go
index 1b88427146..6d81bf8781 100644
--- a/src/cmd/compile/internal/ir/expr.go
+++ b/src/cmd/compile/internal/ir/expr.go
@@ -527,7 +527,7 @@ func (n *SelectorExpr) FuncName() *Name {
 		panic(n.no("FuncName"))
 	}
 	fn := NewNameAt(n.Selection.Pos, MethodSym(n.X.Type(), n.Sel))
-	fn.Class_ = PFUNC
+	fn.Class = PFUNC
 	fn.SetType(n.Type())
 	return fn
 }
@@ -736,7 +736,7 @@ func IsAddressable(n Node) bool {
 
 	case ONAME:
 		n := n.(*Name)
-		if n.Class_ == PFUNC {
+		if n.Class == PFUNC {
 			return false
 		}
 		return true
@@ -771,7 +771,7 @@ func staticValue1(nn Node) Node {
 		return nil
 	}
 	n := nn.(*Name)
-	if n.Class_ != PAUTO || n.Addrtaken() {
+	if n.Class != PAUTO || n.Addrtaken() {
 		return nil
 	}
 
diff --git a/src/cmd/compile/internal/ir/func.go b/src/cmd/compile/internal/ir/func.go
index 1eaca9c6f3..12ef083c19 100644
--- a/src/cmd/compile/internal/ir/func.go
+++ b/src/cmd/compile/internal/ir/func.go
@@ -245,11 +245,11 @@ func FuncSymName(s *types.Sym) string {
 
 // MarkFunc marks a node as a function.
 func MarkFunc(n *Name) {
-	if n.Op() != ONAME || n.Class_ != Pxxx {
+	if n.Op() != ONAME || n.Class != Pxxx {
 		base.Fatalf("expected ONAME/Pxxx node, got %v", n)
 	}
 
-	n.Class_ = PFUNC
+	n.Class = PFUNC
 	n.Sym().SetFunc(true)
 }
 
diff --git a/src/cmd/compile/internal/ir/name.go b/src/cmd/compile/internal/ir/name.go
index 689ef983f6..58b4ababff 100644
--- a/src/cmd/compile/internal/ir/name.go
+++ b/src/cmd/compile/internal/ir/name.go
@@ -37,7 +37,7 @@ func (*Ident) CanBeNtype() {}
 type Name struct {
 	miniExpr
 	BuiltinOp Op         // uint8
-	Class_    Class      // uint8
+	Class     Class      // uint8
 	pragma    PragmaFlag // int16
 	flags     bitset16
 	sym       *types.Sym
@@ -222,8 +222,6 @@ func (n *Name) Sym() *types.Sym     { return n.sym }
 func (n *Name) SetSym(x *types.Sym) { n.sym = x }
 func (n *Name) SubOp() Op           { return n.BuiltinOp }
 func (n *Name) SetSubOp(x Op)       { n.BuiltinOp = x }
-func (n *Name) Class() Class        { return n.Class_ }
-func (n *Name) SetClass(x Class)    { n.Class_ = x }
 func (n *Name) SetFunc(x *Func)     { n.Func = x }
 func (n *Name) Offset() int64       { panic("Name.Offset") }
 func (n *Name) SetOffset(x int64) {
@@ -425,7 +423,7 @@ func IsParamStackCopy(n Node) bool {
 		return false
 	}
 	name := n.(*Name)
-	return (name.Class_ == PPARAM || name.Class_ == PPARAMOUT) && name.Heapaddr != nil
+	return (name.Class == PPARAM || name.Class == PPARAMOUT) && name.Heapaddr != nil
 }
 
 // IsParamHeapCopy reports whether this is the on-heap copy of
@@ -435,7 +433,7 @@ func IsParamHeapCopy(n Node) bool {
 		return false
 	}
 	name := n.(*Name)
-	return name.Class_ == PAUTOHEAP && name.Stackcopy != nil
+	return name.Class == PAUTOHEAP && name.Stackcopy != nil
 }
 
 var RegFP *Name
diff --git a/src/cmd/compile/internal/ir/scc.go b/src/cmd/compile/internal/ir/scc.go
index f35c4d44e9..83c6074170 100644
--- a/src/cmd/compile/internal/ir/scc.go
+++ b/src/cmd/compile/internal/ir/scc.go
@@ -87,7 +87,7 @@ func (v *bottomUpVisitor) visit(n *Func) uint32 {
 	Visit(n, func(n Node) {
 		switch n.Op() {
 		case ONAME:
-			if n := n.(*Name); n.Class_ == PFUNC {
+			if n := n.(*Name); n.Class == PFUNC {
 				do(n.Defn)
 			}
 		case ODOTMETH, OCALLPART, OMETHEXPR:
diff --git a/src/cmd/compile/internal/liveness/plive.go b/src/cmd/compile/internal/liveness/plive.go
index 91f10b0a9d..26d90824b2 100644
--- a/src/cmd/compile/internal/liveness/plive.go
+++ b/src/cmd/compile/internal/liveness/plive.go
@@ -181,7 +181,7 @@ type progeffectscache struct {
 // nor do we care about empty structs (handled by the pointer check),
 // nor do we care about the fake PAUTOHEAP variables.
 func ShouldTrack(n *ir.Name) bool {
-	return (n.Class_ == ir.PAUTO || n.Class_ == ir.PPARAM || n.Class_ == ir.PPARAMOUT) && n.Type().HasPointers()
+	return (n.Class == ir.PAUTO || n.Class == ir.PPARAM || n.Class == ir.PPARAMOUT) && n.Type().HasPointers()
 }
 
 // getvariables returns the list of on-stack variables that we need to track
@@ -208,7 +208,7 @@ func (lv *liveness) initcache() {
 	lv.cache.initialized = true
 
 	for i, node := range lv.vars {
-		switch node.Class_ {
+		switch node.Class {
 		case ir.PPARAM:
 			// A return instruction with a p.to is a tail return, which brings
 			// the stack pointer back up (if it ever went down) and then jumps
@@ -386,7 +386,7 @@ func (lv *liveness) pointerMap(liveout bitvec.BitVec, vars []*ir.Name, args, loc
 			break
 		}
 		node := vars[i]
-		switch node.Class_ {
+		switch node.Class {
 		case ir.PAUTO:
 			typebits.Set(node.Type(), node.FrameOffset()+lv.stkptrsize, locals)
 
@@ -687,7 +687,7 @@ func (lv *liveness) epilogue() {
 	// don't need to keep the stack copy live?
 	if lv.fn.HasDefer() {
 		for i, n := range lv.vars {
-			if n.Class_ == ir.PPARAMOUT {
+			if n.Class == ir.PPARAMOUT {
 				if n.IsOutputParamHeapAddr() {
 					// Just to be paranoid.  Heap addresses are PAUTOs.
 					base.Fatalf("variable %v both output param and heap output param", n)
@@ -785,7 +785,7 @@ func (lv *liveness) epilogue() {
 				if !liveout.Get(int32(i)) {
 					continue
 				}
-				if n.Class_ == ir.PPARAM {
+				if n.Class == ir.PPARAM {
 					continue // ok
 				}
 				base.Fatalf("bad live variable at entry of %v: %L", lv.fn.Nname, n)
@@ -818,7 +818,7 @@ func (lv *liveness) epilogue() {
 	// the only things that can possibly be live are the
 	// input parameters.
 	for j, n := range lv.vars {
-		if n.Class_ != ir.PPARAM && lv.stackMaps[0].Get(int32(j)) {
+		if n.Class != ir.PPARAM && lv.stackMaps[0].Get(int32(j)) {
 			lv.f.Fatalf("%v %L recorded as live on entry", lv.fn.Nname, n)
 		}
 	}
@@ -1063,7 +1063,7 @@ func (lv *liveness) emit() (argsSym, liveSym *obj.LSym) {
 	// (Nodes without pointers aren't in lv.vars; see livenessShouldTrack.)
 	var maxArgNode *ir.Name
 	for _, n := range lv.vars {
-		switch n.Class_ {
+		switch n.Class {
 		case ir.PPARAM, ir.PPARAMOUT:
 			if maxArgNode == nil || n.FrameOffset() > maxArgNode.FrameOffset() {
 				maxArgNode = n
diff --git a/src/cmd/compile/internal/noder/noder.go b/src/cmd/compile/internal/noder/noder.go
index 678e378291..76913c62a6 100644
--- a/src/cmd/compile/internal/noder/noder.go
+++ b/src/cmd/compile/internal/noder/noder.go
@@ -1176,10 +1176,10 @@ func (p *noder) stmtFall(stmt syntax.Stmt, fallOK bool) ir.Node {
 		n := ir.NewReturnStmt(p.pos(stmt), p.exprList(stmt.Results))
 		if len(n.Results) == 0 && ir.CurFunc != nil {
 			for _, ln := range ir.CurFunc.Dcl {
-				if ln.Class_ == ir.PPARAM {
+				if ln.Class == ir.PPARAM {
 					continue
 				}
-				if ln.Class_ != ir.PPARAMOUT {
+				if ln.Class != ir.PPARAMOUT {
 					break
 				}
 				if ln.Sym().Def != ln {
@@ -1956,7 +1956,7 @@ func oldname(s *types.Sym) ir.Node {
 		if c == nil || c.Curfn != ir.CurFunc {
 			// Do not have a closure var for the active closure yet; make one.
 			c = typecheck.NewName(s)
-			c.Class_ = ir.PAUTOHEAP
+			c.Class = ir.PAUTOHEAP
 			c.SetIsClosureVar(true)
 			c.Defn = n
 
diff --git a/src/cmd/compile/internal/pkginit/init.go b/src/cmd/compile/internal/pkginit/init.go
index a32e09879c..5bc66c7e1b 100644
--- a/src/cmd/compile/internal/pkginit/init.go
+++ b/src/cmd/compile/internal/pkginit/init.go
@@ -32,7 +32,7 @@ func Task() *ir.Name {
 		if n.Op() == ir.ONONAME {
 			continue
 		}
-		if n.Op() != ir.ONAME || n.(*ir.Name).Class_ != ir.PEXTERN {
+		if n.Op() != ir.ONAME || n.(*ir.Name).Class != ir.PEXTERN {
 			base.Fatalf("bad inittask: %v", n)
 		}
 		deps = append(deps, n.(*ir.Name).Linksym())
@@ -89,7 +89,7 @@ func Task() *ir.Name {
 	sym := typecheck.Lookup(".inittask")
 	task := typecheck.NewName(sym)
 	task.SetType(types.Types[types.TUINT8]) // fake type
-	task.Class_ = ir.PEXTERN
+	task.Class = ir.PEXTERN
 	sym.Def = task
 	lsym := task.Linksym()
 	ot := 0
diff --git a/src/cmd/compile/internal/pkginit/initorder.go b/src/cmd/compile/internal/pkginit/initorder.go
index 1c222c1de4..bdefd594ff 100644
--- a/src/cmd/compile/internal/pkginit/initorder.go
+++ b/src/cmd/compile/internal/pkginit/initorder.go
@@ -140,7 +140,7 @@ func (o *InitOrder) processAssign(n ir.Node) {
 		defn := dep.Defn
 		// Skip dependencies on functions (PFUNC) and
 		// variables already initialized (InitDone).
-		if dep.Class_ != ir.PEXTERN || o.order[defn] == orderDone {
+		if dep.Class != ir.PEXTERN || o.order[defn] == orderDone {
 			continue
 		}
 		o.order[n]++
@@ -204,7 +204,7 @@ func (o *InitOrder) findInitLoopAndExit(n *ir.Name, path *[]*ir.Name) {
 	*path = append(*path, n)
 	for _, ref := range refers {
 		// Short-circuit variables that were initialized.
-		if ref.Class_ == ir.PEXTERN && o.order[ref.Defn] == orderDone {
+		if ref.Class == ir.PEXTERN && o.order[ref.Defn] == orderDone {
 			continue
 		}
 
@@ -221,7 +221,7 @@ func reportInitLoopAndExit(l []*ir.Name) {
 	// the start.
 	i := -1
 	for j, n := range l {
-		if n.Class_ == ir.PEXTERN && (i == -1 || n.Pos().Before(l[i].Pos())) {
+		if n.Class == ir.PEXTERN && (i == -1 || n.Pos().Before(l[i].Pos())) {
 			i = j
 		}
 	}
@@ -291,7 +291,7 @@ func (d *initDeps) visit(n ir.Node) {
 	switch n.Op() {
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		switch n.Class_ {
+		switch n.Class {
 		case ir.PEXTERN, ir.PFUNC:
 			d.foundDep(n)
 		}
@@ -324,7 +324,7 @@ func (d *initDeps) foundDep(n *ir.Name) {
 		return
 	}
 	d.seen.Add(n)
-	if d.transitive && n.Class_ == ir.PFUNC {
+	if d.transitive && n.Class == ir.PFUNC {
 		d.inspectList(n.Defn.(*ir.Func).Body)
 	}
 }
diff --git a/src/cmd/compile/internal/reflectdata/reflect.go b/src/cmd/compile/internal/reflectdata/reflect.go
index f926765326..30857fff6d 100644
--- a/src/cmd/compile/internal/reflectdata/reflect.go
+++ b/src/cmd/compile/internal/reflectdata/reflect.go
@@ -840,7 +840,7 @@ func TypePtr(t *types.Type) *ir.AddrExpr {
 	if s.Def == nil {
 		n := ir.NewNameAt(src.NoXPos, s)
 		n.SetType(types.Types[types.TUINT8])
-		n.Class_ = ir.PEXTERN
+		n.Class = ir.PEXTERN
 		n.SetTypecheck(1)
 		s.Def = n
 	}
@@ -859,7 +859,7 @@ func ITabAddr(t, itype *types.Type) *ir.AddrExpr {
 	if s.Def == nil {
 		n := typecheck.NewName(s)
 		n.SetType(types.Types[types.TUINT8])
-		n.Class_ = ir.PEXTERN
+		n.Class = ir.PEXTERN
 		n.SetTypecheck(1)
 		s.Def = n
 		itabs = append(itabs, itabEntry{t: t, itype: itype, lsym: n.Linksym()})
@@ -1370,7 +1370,7 @@ func WriteTabs() {
 			// }
 			nsym := dname(p.Sym().Name, "", nil, true)
 			t := p.Type()
-			if p.Class_ != ir.PFUNC {
+			if p.Class != ir.PFUNC {
 				t = types.NewPtr(t)
 			}
 			tsym := WriteType(t)
@@ -1674,7 +1674,7 @@ func ZeroAddr(size int64) ir.Node {
 	if s.Def == nil {
 		x := typecheck.NewName(s)
 		x.SetType(types.Types[types.TUINT8])
-		x.Class_ = ir.PEXTERN
+		x.Class = ir.PEXTERN
 		x.SetTypecheck(1)
 		s.Def = x
 	}
diff --git a/src/cmd/compile/internal/ssa/deadstore.go b/src/cmd/compile/internal/ssa/deadstore.go
index a68c82ba97..530918da4d 100644
--- a/src/cmd/compile/internal/ssa/deadstore.go
+++ b/src/cmd/compile/internal/ssa/deadstore.go
@@ -148,7 +148,7 @@ func elimDeadAutosGeneric(f *Func) {
 		case OpAddr, OpLocalAddr:
 			// Propagate the address if it points to an auto.
 			n, ok := v.Aux.(*ir.Name)
-			if !ok || n.Class() != ir.PAUTO {
+			if !ok || n.Class != ir.PAUTO {
 				return
 			}
 			if addr[v] == nil {
@@ -159,7 +159,7 @@ func elimDeadAutosGeneric(f *Func) {
 		case OpVarDef, OpVarKill:
 			// v should be eliminated if we eliminate the auto.
 			n, ok := v.Aux.(*ir.Name)
-			if !ok || n.Class() != ir.PAUTO {
+			if !ok || n.Class != ir.PAUTO {
 				return
 			}
 			if elim[v] == nil {
@@ -175,7 +175,7 @@ func elimDeadAutosGeneric(f *Func) {
 			// may not be used by the inline code, but will be used by
 			// panic processing).
 			n, ok := v.Aux.(*ir.Name)
-			if !ok || n.Class() != ir.PAUTO {
+			if !ok || n.Class != ir.PAUTO {
 				return
 			}
 			if !used[n] {
@@ -307,7 +307,7 @@ func elimUnreadAutos(f *Func) {
 			if !ok {
 				continue
 			}
-			if n.Class() != ir.PAUTO {
+			if n.Class != ir.PAUTO {
 				continue
 			}
 
diff --git a/src/cmd/compile/internal/ssa/export_test.go b/src/cmd/compile/internal/ssa/export_test.go
index 8712ff78c1..32e6d09d1b 100644
--- a/src/cmd/compile/internal/ssa/export_test.go
+++ b/src/cmd/compile/internal/ssa/export_test.go
@@ -70,7 +70,7 @@ func (TestFrontend) StringData(s string) *obj.LSym {
 }
 func (TestFrontend) Auto(pos src.XPos, t *types.Type) *ir.Name {
 	n := ir.NewNameAt(pos, &types.Sym{Name: "aFakeAuto"})
-	n.SetClass(ir.PAUTO)
+	n.Class = ir.PAUTO
 	return n
 }
 func (d TestFrontend) SplitString(s LocalSlot) (LocalSlot, LocalSlot) {
diff --git a/src/cmd/compile/internal/ssagen/nowb.go b/src/cmd/compile/internal/ssagen/nowb.go
index 26858fac87..60cfb2f698 100644
--- a/src/cmd/compile/internal/ssagen/nowb.go
+++ b/src/cmd/compile/internal/ssagen/nowb.go
@@ -76,7 +76,7 @@ func (c *nowritebarrierrecChecker) findExtraCalls(nn ir.Node) {
 		return
 	}
 	fn := n.X.(*ir.Name)
-	if fn.Class_ != ir.PFUNC || fn.Defn == nil {
+	if fn.Class != ir.PFUNC || fn.Defn == nil {
 		return
 	}
 	if !types.IsRuntimePkg(fn.Sym().Pkg) || fn.Sym().Name != "systemstack" {
diff --git a/src/cmd/compile/internal/ssagen/pgen.go b/src/cmd/compile/internal/ssagen/pgen.go
index 2be10ff7af..bbd319d735 100644
--- a/src/cmd/compile/internal/ssagen/pgen.go
+++ b/src/cmd/compile/internal/ssagen/pgen.go
@@ -34,11 +34,11 @@ import (
 // the top of the stack and increasing in size.
 // Non-autos sort on offset.
 func cmpstackvarlt(a, b *ir.Name) bool {
-	if (a.Class_ == ir.PAUTO) != (b.Class_ == ir.PAUTO) {
-		return b.Class_ == ir.PAUTO
+	if (a.Class == ir.PAUTO) != (b.Class == ir.PAUTO) {
+		return b.Class == ir.PAUTO
 	}
 
-	if a.Class_ != ir.PAUTO {
+	if a.Class != ir.PAUTO {
 		return a.FrameOffset() < b.FrameOffset()
 	}
 
@@ -79,7 +79,7 @@ func (s *ssafn) AllocFrame(f *ssa.Func) {
 
 	// Mark the PAUTO's unused.
 	for _, ln := range fn.Dcl {
-		if ln.Class_ == ir.PAUTO {
+		if ln.Class == ir.PAUTO {
 			ln.SetUsed(false)
 		}
 	}
@@ -94,7 +94,7 @@ func (s *ssafn) AllocFrame(f *ssa.Func) {
 	for _, b := range f.Blocks {
 		for _, v := range b.Values {
 			if n, ok := v.Aux.(*ir.Name); ok {
-				switch n.Class_ {
+				switch n.Class {
 				case ir.PPARAM, ir.PPARAMOUT:
 					// Don't modify nodfp; it is a global.
 					if n != ir.RegFP {
@@ -120,7 +120,7 @@ func (s *ssafn) AllocFrame(f *ssa.Func) {
 	// Reassign stack offsets of the locals that are used.
 	lastHasPtr := false
 	for i, n := range fn.Dcl {
-		if n.Op() != ir.ONAME || n.Class_ != ir.PAUTO {
+		if n.Op() != ir.ONAME || n.Class != ir.PAUTO {
 			continue
 		}
 		if !n.Used() {
@@ -207,7 +207,7 @@ func init() {
 func StackOffset(slot ssa.LocalSlot) int32 {
 	n := slot.N
 	var off int64
-	switch n.Class_ {
+	switch n.Class {
 	case ir.PAUTO:
 		off = n.FrameOffset()
 		if base.Ctxt.FixedFrameSize() == 0 {
diff --git a/src/cmd/compile/internal/ssagen/pgen_test.go b/src/cmd/compile/internal/ssagen/pgen_test.go
index 82d8447e9f..69ed8ad74e 100644
--- a/src/cmd/compile/internal/ssagen/pgen_test.go
+++ b/src/cmd/compile/internal/ssagen/pgen_test.go
@@ -46,7 +46,7 @@ func TestCmpstackvar(t *testing.T) {
 		n := typecheck.NewName(s)
 		n.SetType(t)
 		n.SetFrameOffset(xoffset)
-		n.Class_ = cl
+		n.Class = cl
 		return n
 	}
 	testdata := []struct {
@@ -161,7 +161,7 @@ func TestStackvarSort(t *testing.T) {
 		n := typecheck.NewName(s)
 		n.SetType(t)
 		n.SetFrameOffset(xoffset)
-		n.Class_ = cl
+		n.Class = cl
 		return n
 	}
 	inp := []*ir.Name{
diff --git a/src/cmd/compile/internal/ssagen/ssa.go b/src/cmd/compile/internal/ssagen/ssa.go
index 8e3b09aac3..5998c42012 100644
--- a/src/cmd/compile/internal/ssagen/ssa.go
+++ b/src/cmd/compile/internal/ssagen/ssa.go
@@ -436,7 +436,7 @@ func buildssa(fn *ir.Func, worker int) *ssa.Func {
 	var args []ssa.Param
 	var results []ssa.Param
 	for _, n := range fn.Dcl {
-		switch n.Class_ {
+		switch n.Class {
 		case ir.PPARAM:
 			s.decladdrs[n] = s.entryNewValue2A(ssa.OpLocalAddr, types.NewPtr(n.Type()), n, s.sp, s.startmem)
 			args = append(args, ssa.Param{Type: n.Type(), Offset: int32(n.FrameOffset())})
@@ -457,13 +457,13 @@ func buildssa(fn *ir.Func, worker int) *ssa.Func {
 		case ir.PFUNC:
 			// local function - already handled by frontend
 		default:
-			s.Fatalf("local variable with class %v unimplemented", n.Class_)
+			s.Fatalf("local variable with class %v unimplemented", n.Class)
 		}
 	}
 
 	// Populate SSAable arguments.
 	for _, n := range fn.Dcl {
-		if n.Class_ == ir.PPARAM && s.canSSA(n) {
+		if n.Class == ir.PPARAM && s.canSSA(n) {
 			v := s.newValue0A(ssa.OpArg, n.Type(), n)
 			s.vars[n] = v
 			s.addNamedValue(n, v) // This helps with debugging information, not needed for compilation itself.
@@ -1166,7 +1166,7 @@ func (s *state) stmt(n ir.Node) {
 	case ir.OCALLINTER:
 		n := n.(*ir.CallExpr)
 		s.callResult(n, callNormal)
-		if n.Op() == ir.OCALLFUNC && n.X.Op() == ir.ONAME && n.X.(*ir.Name).Class_ == ir.PFUNC {
+		if n.Op() == ir.OCALLFUNC && n.X.Op() == ir.ONAME && n.X.(*ir.Name).Class == ir.PFUNC {
 			if fn := n.X.Sym().Name; base.Flag.CompilingRuntime && fn == "throw" ||
 				n.X.Sym().Pkg == ir.Pkgs.Runtime && (fn == "throwinit" || fn == "gopanic" || fn == "panicwrap" || fn == "block" || fn == "panicmakeslicelen" || fn == "panicmakeslicecap") {
 				m := s.mem()
@@ -1242,7 +1242,7 @@ func (s *state) stmt(n ir.Node) {
 
 	case ir.ODCL:
 		n := n.(*ir.Decl)
-		if n.X.Class_ == ir.PAUTOHEAP {
+		if n.X.Class == ir.PAUTOHEAP {
 			s.Fatalf("DCL %v", n)
 		}
 
@@ -1634,7 +1634,7 @@ func (s *state) stmt(n ir.Node) {
 		if !v.Addrtaken() {
 			s.Fatalf("VARLIVE variable %v must have Addrtaken set", v)
 		}
-		switch v.Class_ {
+		switch v.Class {
 		case ir.PAUTO, ir.PPARAM, ir.PPARAMOUT:
 		default:
 			s.Fatalf("VARLIVE variable %v must be Auto or Arg", v)
@@ -2110,7 +2110,7 @@ func (s *state) expr(n ir.Node) *ssa.Value {
 		return s.entryNewValue1A(ssa.OpAddr, n.Type(), aux, s.sb)
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		if n.Class_ == ir.PFUNC {
+		if n.Class == ir.PFUNC {
 			// "value" of a function is the address of the function's closure
 			sym := staticdata.FuncLinksym(n)
 			return s.entryNewValue1A(ssa.OpAddr, types.NewPtr(n.Type()), sym, s.sb)
@@ -3003,7 +3003,7 @@ func (s *state) append(n *ir.CallExpr, inplace bool) *ssa.Value {
 	if inplace {
 		if sn.Op() == ir.ONAME {
 			sn := sn.(*ir.Name)
-			if sn.Class_ != ir.PEXTERN {
+			if sn.Class != ir.PEXTERN {
 				// Tell liveness we're about to build a new slice
 				s.vars[memVar] = s.newValue1A(ssa.OpVarDef, types.TypeMem, sn, s.mem())
 			}
@@ -3222,7 +3222,7 @@ func (s *state) assign(left ir.Node, right *ssa.Value, deref bool, skip skipMask
 
 	// If this assignment clobbers an entire local variable, then emit
 	// OpVarDef so liveness analysis knows the variable is redefined.
-	if base := clobberBase(left); base.Op() == ir.ONAME && base.(*ir.Name).Class_ != ir.PEXTERN && skip == 0 {
+	if base := clobberBase(left); base.Op() == ir.ONAME && base.(*ir.Name).Class != ir.PEXTERN && skip == 0 {
 		s.vars[memVar] = s.newValue1Apos(ssa.OpVarDef, types.TypeMem, base.(*ir.Name), s.mem(), !ir.IsAutoTmp(base))
 	}
 
@@ -4385,7 +4385,7 @@ func (s *state) openDeferRecord(n *ir.CallExpr) {
 		closureVal := s.expr(fn)
 		closure := s.openDeferSave(nil, fn.Type(), closureVal)
 		opendefer.closureNode = closure.Aux.(*ir.Name)
-		if !(fn.Op() == ir.ONAME && fn.(*ir.Name).Class_ == ir.PFUNC) {
+		if !(fn.Op() == ir.ONAME && fn.(*ir.Name).Class == ir.PFUNC) {
 			opendefer.closure = closure
 		}
 	} else if n.Op() == ir.OCALLMETH {
@@ -4651,7 +4651,7 @@ func (s *state) call(n *ir.CallExpr, k callKind, returnResultAddr bool) *ssa.Val
 	switch n.Op() {
 	case ir.OCALLFUNC:
 		testLateExpansion = k != callDeferStack && ssa.LateCallExpansionEnabledWithin(s.f)
-		if k == callNormal && fn.Op() == ir.ONAME && fn.(*ir.Name).Class_ == ir.PFUNC {
+		if k == callNormal && fn.Op() == ir.ONAME && fn.(*ir.Name).Class == ir.PFUNC {
 			fn := fn.(*ir.Name)
 			sym = fn.Sym()
 			break
@@ -4958,7 +4958,7 @@ func (s *state) addr(n ir.Node) *ssa.Value {
 		fallthrough
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		switch n.Class_ {
+		switch n.Class {
 		case ir.PEXTERN:
 			// global variable
 			v := s.entryNewValue1A(ssa.OpAddr, t, n.Linksym(), s.sb)
@@ -4987,7 +4987,7 @@ func (s *state) addr(n ir.Node) *ssa.Value {
 			// that cse works on their addresses
 			return s.newValue2Apos(ssa.OpLocalAddr, t, n, s.sp, s.mem(), true)
 		default:
-			s.Fatalf("variable address class %v not implemented", n.Class_)
+			s.Fatalf("variable address class %v not implemented", n.Class)
 			return nil
 		}
 	case ir.ORESULT:
@@ -5096,10 +5096,10 @@ func (s *state) canSSAName(name *ir.Name) bool {
 	if ir.IsParamHeapCopy(name) {
 		return false
 	}
-	if name.Class_ == ir.PAUTOHEAP {
+	if name.Class == ir.PAUTOHEAP {
 		s.Fatalf("canSSA of PAUTOHEAP %v", name)
 	}
-	switch name.Class_ {
+	switch name.Class {
 	case ir.PEXTERN:
 		return false
 	case ir.PPARAMOUT:
@@ -5117,7 +5117,7 @@ func (s *state) canSSAName(name *ir.Name) bool {
 			return false
 		}
 	}
-	if name.Class_ == ir.PPARAM && name.Sym() != nil && name.Sym().Name == ".this" {
+	if name.Class == ir.PPARAM && name.Sym() != nil && name.Sym().Name == ".this" {
 		// wrappers generated by genwrapper need to update
 		// the .this pointer in place.
 		// TODO: treat as a PPARAMOUT?
@@ -6210,7 +6210,7 @@ func (s *state) mem() *ssa.Value {
 }
 
 func (s *state) addNamedValue(n *ir.Name, v *ssa.Value) {
-	if n.Class_ == ir.Pxxx {
+	if n.Class == ir.Pxxx {
 		// Don't track our marker nodes (memVar etc.).
 		return
 	}
@@ -6218,7 +6218,7 @@ func (s *state) addNamedValue(n *ir.Name, v *ssa.Value) {
 		// Don't track temporary variables.
 		return
 	}
-	if n.Class_ == ir.PPARAMOUT {
+	if n.Class == ir.PPARAMOUT {
 		// Don't track named output values.  This prevents return values
 		// from being assigned too early. See #14591 and #14762. TODO: allow this.
 		return
@@ -6741,8 +6741,8 @@ func defframe(s *State, e *ssafn) {
 		if !n.Needzero() {
 			continue
 		}
-		if n.Class_ != ir.PAUTO {
-			e.Fatalf(n.Pos(), "needzero class %d", n.Class_)
+		if n.Class != ir.PAUTO {
+			e.Fatalf(n.Pos(), "needzero class %d", n.Class)
 		}
 		if n.Type().Size()%int64(types.PtrSize) != 0 || n.FrameOffset()%int64(types.PtrSize) != 0 || n.Type().Size() == 0 {
 			e.Fatalf(n.Pos(), "var %L has size %d offset %d", n, n.Type().Size(), n.Offset_)
@@ -6826,7 +6826,7 @@ func AddAux2(a *obj.Addr, v *ssa.Value, offset int64) {
 		a.Name = obj.NAME_EXTERN
 		a.Sym = n
 	case *ir.Name:
-		if n.Class_ == ir.PPARAM || n.Class_ == ir.PPARAMOUT {
+		if n.Class == ir.PPARAM || n.Class == ir.PPARAMOUT {
 			a.Name = obj.NAME_PARAM
 			a.Sym = ir.Orig(n).(*ir.Name).Linksym()
 			a.Offset += n.FrameOffset()
@@ -6968,7 +6968,7 @@ func AddrAuto(a *obj.Addr, v *ssa.Value) {
 	a.Sym = n.Linksym()
 	a.Reg = int16(Arch.REGSP)
 	a.Offset = n.FrameOffset() + off
-	if n.Class_ == ir.PPARAM || n.Class_ == ir.PPARAMOUT {
+	if n.Class == ir.PPARAM || n.Class == ir.PPARAMOUT {
 		a.Name = obj.NAME_PARAM
 	} else {
 		a.Name = obj.NAME_AUTO
@@ -7198,7 +7198,7 @@ func (e *ssafn) DerefItab(it *obj.LSym, offset int64) *obj.LSym {
 func (e *ssafn) SplitSlot(parent *ssa.LocalSlot, suffix string, offset int64, t *types.Type) ssa.LocalSlot {
 	node := parent.N
 
-	if node.Class_ != ir.PAUTO || node.Addrtaken() {
+	if node.Class != ir.PAUTO || node.Addrtaken() {
 		// addressed things and non-autos retain their parents (i.e., cannot truly be split)
 		return ssa.LocalSlot{N: node, Type: t, Off: parent.Off + offset}
 	}
@@ -7208,7 +7208,7 @@ func (e *ssafn) SplitSlot(parent *ssa.LocalSlot, suffix string, offset int64, t
 	s.Def = n
 	ir.AsNode(s.Def).Name().SetUsed(true)
 	n.SetType(t)
-	n.Class_ = ir.PAUTO
+	n.Class = ir.PAUTO
 	n.SetEsc(ir.EscNever)
 	n.Curfn = e.curfn
 	e.curfn.Dcl = append(e.curfn.Dcl, n)
diff --git a/src/cmd/compile/internal/staticdata/data.go b/src/cmd/compile/internal/staticdata/data.go
index 27d9cec06d..94fa6760a0 100644
--- a/src/cmd/compile/internal/staticdata/data.go
+++ b/src/cmd/compile/internal/staticdata/data.go
@@ -50,8 +50,8 @@ func InitFunc(n *ir.Name, noff int64, f *ir.Name) {
 	if n.Sym() == nil {
 		base.Fatalf("pfuncsym nil n sym")
 	}
-	if f.Class_ != ir.PFUNC {
-		base.Fatalf("pfuncsym class not PFUNC %d", f.Class_)
+	if f.Class != ir.PFUNC {
+		base.Fatalf("pfuncsym class not PFUNC %d", f.Class)
 	}
 	s := n.Linksym()
 	s.WriteAddr(base.Ctxt, noff, types.PtrSize, FuncLinksym(f), 0)
@@ -259,7 +259,7 @@ func FuncSym(s *types.Sym) *types.Sym {
 }
 
 func FuncLinksym(n *ir.Name) *obj.LSym {
-	if n.Op() != ir.ONAME || n.Class_ != ir.PFUNC {
+	if n.Op() != ir.ONAME || n.Class != ir.PFUNC {
 		base.Fatalf("expected func name: %v", n)
 	}
 	return FuncSym(n.Sym()).Linksym()
diff --git a/src/cmd/compile/internal/staticinit/sched.go b/src/cmd/compile/internal/staticinit/sched.go
index 8e4ce55954..ac0b6cd87e 100644
--- a/src/cmd/compile/internal/staticinit/sched.go
+++ b/src/cmd/compile/internal/staticinit/sched.go
@@ -78,12 +78,12 @@ func (s *Schedule) tryStaticInit(nn ir.Node) bool {
 // like staticassign but we are copying an already
 // initialized value r.
 func (s *Schedule) staticcopy(l *ir.Name, loff int64, rn *ir.Name, typ *types.Type) bool {
-	if rn.Class_ == ir.PFUNC {
+	if rn.Class == ir.PFUNC {
 		// TODO if roff != 0 { panic }
 		staticdata.InitFunc(l, loff, rn)
 		return true
 	}
-	if rn.Class_ != ir.PEXTERN || rn.Sym().Pkg != types.LocalPkg {
+	if rn.Class != ir.PEXTERN || rn.Sym().Pkg != types.LocalPkg {
 		return false
 	}
 	if rn.Defn.Op() != ir.OAS {
@@ -246,7 +246,7 @@ func (s *Schedule) StaticAssign(l *ir.Name, loff int64, r ir.Node, typ *types.Ty
 
 	case ir.OSTR2BYTES:
 		r := r.(*ir.ConvExpr)
-		if l.Class_ == ir.PEXTERN && r.X.Op() == ir.OLITERAL {
+		if l.Class == ir.PEXTERN && r.X.Op() == ir.OLITERAL {
 			sval := ir.StringVal(r.X)
 			staticdata.InitSliceBytes(l, loff, sval)
 			return true
diff --git a/src/cmd/compile/internal/typecheck/dcl.go b/src/cmd/compile/internal/typecheck/dcl.go
index 5eaf100eed..6c3aa3781e 100644
--- a/src/cmd/compile/internal/typecheck/dcl.go
+++ b/src/cmd/compile/internal/typecheck/dcl.go
@@ -91,7 +91,7 @@ func Declare(n *ir.Name, ctxt ir.Class) {
 	s.Lastlineno = base.Pos
 	s.Def = n
 	n.Vargen = int32(gen)
-	n.Class_ = ctxt
+	n.Class = ctxt
 	if ctxt == ir.PFUNC {
 		n.Sym().SetFunc(true)
 	}
@@ -455,7 +455,7 @@ func TempAt(pos src.XPos, curfn *ir.Func, t *types.Type) *ir.Name {
 	n := ir.NewNameAt(pos, s)
 	s.Def = n
 	n.SetType(t)
-	n.Class_ = ir.PAUTO
+	n.Class = ir.PAUTO
 	n.SetEsc(ir.EscNever)
 	n.Curfn = curfn
 	n.SetUsed(true)
diff --git a/src/cmd/compile/internal/typecheck/export.go b/src/cmd/compile/internal/typecheck/export.go
index c525391401..63d0a1ec6c 100644
--- a/src/cmd/compile/internal/typecheck/export.go
+++ b/src/cmd/compile/internal/typecheck/export.go
@@ -53,7 +53,7 @@ func importsym(ipkg *types.Pkg, pos src.XPos, s *types.Sym, op ir.Op, ctxt ir.Cl
 	}
 
 	n := ir.NewDeclNameAt(pos, op, s)
-	n.Class_ = ctxt // TODO(mdempsky): Move this into NewDeclNameAt too?
+	n.Class = ctxt // TODO(mdempsky): Move this into NewDeclNameAt too?
 	s.SetPkgDef(n)
 	return n
 }
diff --git a/src/cmd/compile/internal/typecheck/func.go b/src/cmd/compile/internal/typecheck/func.go
index 8592397004..b3efb8f25a 100644
--- a/src/cmd/compile/internal/typecheck/func.go
+++ b/src/cmd/compile/internal/typecheck/func.go
@@ -129,7 +129,7 @@ func CaptureVars(fn *ir.Func) {
 		outermost := v.Defn.(*ir.Name)
 
 		// out parameters will be assigned to implicitly upon return.
-		if outermost.Class_ != ir.PPARAMOUT && !outermost.Addrtaken() && !outermost.Assigned() && v.Type().Size() <= 128 {
+		if outermost.Class != ir.PPARAMOUT && !outermost.Addrtaken() && !outermost.Assigned() && v.Type().Size() <= 128 {
 			v.SetByval(true)
 		} else {
 			outermost.SetAddrtaken(true)
@@ -408,7 +408,7 @@ func tcFunc(n *ir.Func) {
 	}
 
 	for _, ln := range n.Dcl {
-		if ln.Op() == ir.ONAME && (ln.Class_ == ir.PPARAM || ln.Class_ == ir.PPARAMOUT) {
+		if ln.Op() == ir.ONAME && (ln.Class == ir.PPARAM || ln.Class == ir.PPARAMOUT) {
 			ln.Decldepth = 1
 		}
 	}
diff --git a/src/cmd/compile/internal/typecheck/iexport.go b/src/cmd/compile/internal/typecheck/iexport.go
index dd515b8ccd..a7927c39a3 100644
--- a/src/cmd/compile/internal/typecheck/iexport.go
+++ b/src/cmd/compile/internal/typecheck/iexport.go
@@ -430,7 +430,7 @@ func (p *iexporter) doDecl(n *ir.Name) {
 
 	switch n.Op() {
 	case ir.ONAME:
-		switch n.Class_ {
+		switch n.Class {
 		case ir.PEXTERN:
 			// Variable.
 			w.tag('V')
@@ -450,7 +450,7 @@ func (p *iexporter) doDecl(n *ir.Name) {
 			w.funcExt(n)
 
 		default:
-			base.Fatalf("unexpected class: %v, %v", n, n.Class_)
+			base.Fatalf("unexpected class: %v, %v", n, n.Class)
 		}
 
 	case ir.OLITERAL:
@@ -1260,7 +1260,7 @@ func (w *exportWriter) expr(n ir.Node) {
 	case ir.ONAME:
 		// Package scope name.
 		n := n.(*ir.Name)
-		if (n.Class_ == ir.PEXTERN || n.Class_ == ir.PFUNC) && !ir.IsBlank(n) {
+		if (n.Class == ir.PEXTERN || n.Class == ir.PFUNC) && !ir.IsBlank(n) {
 			w.op(ir.ONONAME)
 			w.qualifiedIdent(n)
 			break
@@ -1526,7 +1526,7 @@ func (w *exportWriter) localName(n *ir.Name) {
 	// PPARAM/PPARAMOUT, because we only want to include vargen in
 	// non-param names.
 	var v int32
-	if n.Class_ == ir.PAUTO || (n.Class_ == ir.PAUTOHEAP && n.Stackcopy == nil) {
+	if n.Class == ir.PAUTO || (n.Class == ir.PAUTOHEAP && n.Stackcopy == nil) {
 		v = n.Vargen
 	}
 
diff --git a/src/cmd/compile/internal/typecheck/iimport.go b/src/cmd/compile/internal/typecheck/iimport.go
index 2dc7e70b65..15c57b2380 100644
--- a/src/cmd/compile/internal/typecheck/iimport.go
+++ b/src/cmd/compile/internal/typecheck/iimport.go
@@ -333,7 +333,7 @@ func (r *importReader) doDecl(sym *types.Sym) *ir.Name {
 
 			// methodSym already marked m.Sym as a function.
 			m := ir.NewNameAt(mpos, ir.MethodSym(recv.Type, msym))
-			m.Class_ = ir.PFUNC
+			m.Class = ir.PFUNC
 			m.SetType(mtyp)
 
 			m.Func = ir.NewFunc(mpos)
diff --git a/src/cmd/compile/internal/typecheck/syms.go b/src/cmd/compile/internal/typecheck/syms.go
index 01c03b5f9f..28db40db91 100644
--- a/src/cmd/compile/internal/typecheck/syms.go
+++ b/src/cmd/compile/internal/typecheck/syms.go
@@ -30,7 +30,7 @@ func SubstArgTypes(old *ir.Name, types_ ...*types.Type) *ir.Name {
 		types.CalcSize(t)
 	}
 	n := ir.NewNameAt(old.Pos(), old.Sym())
-	n.Class_ = old.Class()
+	n.Class = old.Class
 	n.SetType(types.SubstAny(old.Type(), &types_))
 	if len(types_) > 0 {
 		base.Fatalf("substArgTypes: too many argument types")
diff --git a/src/cmd/compile/internal/typecheck/typecheck.go b/src/cmd/compile/internal/typecheck/typecheck.go
index 812b94de0d..981f4ef1d6 100644
--- a/src/cmd/compile/internal/typecheck/typecheck.go
+++ b/src/cmd/compile/internal/typecheck/typecheck.go
@@ -2099,7 +2099,7 @@ func CheckUnused(fn *ir.Func) {
 
 	// Propagate the used flag for typeswitch variables up to the NONAME in its definition.
 	for _, ln := range fn.Dcl {
-		if ln.Op() == ir.ONAME && ln.Class_ == ir.PAUTO && ln.Used() {
+		if ln.Op() == ir.ONAME && ln.Class == ir.PAUTO && ln.Used() {
 			if guard, ok := ln.Defn.(*ir.TypeSwitchGuard); ok {
 				guard.Used = true
 			}
@@ -2107,7 +2107,7 @@ func CheckUnused(fn *ir.Func) {
 	}
 
 	for _, ln := range fn.Dcl {
-		if ln.Op() != ir.ONAME || ln.Class_ != ir.PAUTO || ln.Used() {
+		if ln.Op() != ir.ONAME || ln.Class != ir.PAUTO || ln.Used() {
 			continue
 		}
 		if defn, ok := ln.Defn.(*ir.TypeSwitchGuard); ok {
diff --git a/src/cmd/compile/internal/typecheck/universe.go b/src/cmd/compile/internal/typecheck/universe.go
index f1e7ed4273..402b8deeb3 100644
--- a/src/cmd/compile/internal/typecheck/universe.go
+++ b/src/cmd/compile/internal/typecheck/universe.go
@@ -357,6 +357,6 @@ func DeclareUniverse() {
 
 	ir.RegFP = NewName(Lookup(".fp"))
 	ir.RegFP.SetType(types.Types[types.TINT32])
-	ir.RegFP.Class_ = ir.PPARAM
+	ir.RegFP.Class = ir.PPARAM
 	ir.RegFP.SetUsed(true)
 }
diff --git a/src/cmd/compile/internal/walk/assign.go b/src/cmd/compile/internal/walk/assign.go
index ec0f60ad93..3fe810ac4e 100644
--- a/src/cmd/compile/internal/walk/assign.go
+++ b/src/cmd/compile/internal/walk/assign.go
@@ -392,7 +392,7 @@ func ascompatee(op ir.Op, nl, nr []ir.Node) []ir.Node {
 
 		appendWalkStmt(&late, convas(ir.NewAssignStmt(base.Pos, lorig, r), &late))
 
-		if name == nil || name.Addrtaken() || name.Class_ == ir.PEXTERN || name.Class_ == ir.PAUTOHEAP {
+		if name == nil || name.Addrtaken() || name.Class == ir.PEXTERN || name.Class == ir.PAUTOHEAP {
 			memWrite = true
 			continue
 		}
@@ -418,7 +418,7 @@ func readsMemory(n ir.Node) bool {
 	switch n.Op() {
 	case ir.ONAME:
 		n := n.(*ir.Name)
-		return n.Class_ == ir.PEXTERN || n.Class_ == ir.PAUTOHEAP || n.Addrtaken()
+		return n.Class == ir.PEXTERN || n.Class == ir.PAUTOHEAP || n.Addrtaken()
 
 	case ir.OADD,
 		ir.OAND,
diff --git a/src/cmd/compile/internal/walk/closure.go b/src/cmd/compile/internal/walk/closure.go
index fcdb43f113..449df88f9e 100644
--- a/src/cmd/compile/internal/walk/closure.go
+++ b/src/cmd/compile/internal/walk/closure.go
@@ -52,7 +52,7 @@ func Closure(fn *ir.Func) {
 				v = addr
 			}
 
-			v.Class_ = ir.PPARAM
+			v.Class = ir.PPARAM
 			decls = append(decls, v)
 
 			fld := types.NewField(src.NoXPos, v.Sym(), v.Type())
@@ -84,7 +84,7 @@ func Closure(fn *ir.Func) {
 
 			if v.Byval() && v.Type().Width <= int64(2*types.PtrSize) {
 				// If it is a small variable captured by value, downgrade it to PAUTO.
-				v.Class_ = ir.PAUTO
+				v.Class = ir.PAUTO
 				fn.Dcl = append(fn.Dcl, v)
 				body = append(body, ir.NewAssignStmt(base.Pos, v, cr))
 			} else {
@@ -92,7 +92,7 @@ func Closure(fn *ir.Func) {
 				// and initialize in entry prologue.
 				addr := typecheck.NewName(typecheck.Lookup("&" + v.Sym().Name))
 				addr.SetType(types.NewPtr(v.Type()))
-				addr.Class_ = ir.PAUTO
+				addr.Class = ir.PAUTO
 				addr.SetUsed(true)
 				addr.Curfn = fn
 				fn.Dcl = append(fn.Dcl, addr)
diff --git a/src/cmd/compile/internal/walk/complit.go b/src/cmd/compile/internal/walk/complit.go
index d8605d39bd..8a77bba2ad 100644
--- a/src/cmd/compile/internal/walk/complit.go
+++ b/src/cmd/compile/internal/walk/complit.go
@@ -68,7 +68,7 @@ func isSimpleName(nn ir.Node) bool {
 		return false
 	}
 	n := nn.(*ir.Name)
-	return n.Class_ != ir.PAUTOHEAP && n.Class_ != ir.PEXTERN
+	return n.Class != ir.PAUTOHEAP && n.Class != ir.PEXTERN
 }
 
 func litas(l ir.Node, r ir.Node, init *ir.Nodes) {
@@ -294,7 +294,7 @@ func slicelit(ctxt initContext, n *ir.CompLitExpr, var_ ir.Node, init *ir.Nodes)
 		// copy static to slice
 		var_ = typecheck.AssignExpr(var_)
 		name, offset, ok := staticinit.StaticLoc(var_)
-		if !ok || name.Class_ != ir.PEXTERN {
+		if !ok || name.Class != ir.PEXTERN {
 			base.Fatalf("slicelit: %v", var_)
 		}
 		staticdata.InitSlice(name, offset, vstat, t.NumElem())
@@ -657,7 +657,7 @@ func genAsStatic(as *ir.AssignStmt) {
 	}
 
 	name, offset, ok := staticinit.StaticLoc(as.X)
-	if !ok || (name.Class_ != ir.PEXTERN && as.X != ir.BlankNode) {
+	if !ok || (name.Class != ir.PEXTERN && as.X != ir.BlankNode) {
 		base.Fatalf("genAsStatic: lhs %v", as.X)
 	}
 
@@ -674,7 +674,7 @@ func genAsStatic(as *ir.AssignStmt) {
 		if r.Offset_ != 0 {
 			base.Fatalf("genAsStatic %+v", as)
 		}
-		if r.Class_ == ir.PFUNC {
+		if r.Class == ir.PFUNC {
 			staticdata.InitFunc(name, offset, r)
 			return
 		}
diff --git a/src/cmd/compile/internal/walk/convert.go b/src/cmd/compile/internal/walk/convert.go
index d0cd5ff753..85459fd92f 100644
--- a/src/cmd/compile/internal/walk/convert.go
+++ b/src/cmd/compile/internal/walk/convert.go
@@ -68,12 +68,12 @@ func walkConvInterface(n *ir.ConvExpr, init *ir.Nodes) ir.Node {
 
 	if ir.Names.Staticuint64s == nil {
 		ir.Names.Staticuint64s = typecheck.NewName(ir.Pkgs.Runtime.Lookup("staticuint64s"))
-		ir.Names.Staticuint64s.Class_ = ir.PEXTERN
+		ir.Names.Staticuint64s.Class = ir.PEXTERN
 		// The actual type is [256]uint64, but we use [256*8]uint8 so we can address
 		// individual bytes.
 		ir.Names.Staticuint64s.SetType(types.NewArray(types.Types[types.TUINT8], 256*8))
 		ir.Names.Zerobase = typecheck.NewName(ir.Pkgs.Runtime.Lookup("zerobase"))
-		ir.Names.Zerobase.Class_ = ir.PEXTERN
+		ir.Names.Zerobase.Class = ir.PEXTERN
 		ir.Names.Zerobase.SetType(types.Types[types.TUINTPTR])
 	}
 
@@ -98,7 +98,7 @@ func walkConvInterface(n *ir.ConvExpr, init *ir.Nodes) ir.Node {
 		xe := ir.NewIndexExpr(base.Pos, ir.Names.Staticuint64s, index)
 		xe.SetBounded(true)
 		value = xe
-	case n.X.Op() == ir.ONAME && n.X.(*ir.Name).Class_ == ir.PEXTERN && n.X.(*ir.Name).Readonly():
+	case n.X.Op() == ir.ONAME && n.X.(*ir.Name).Class == ir.PEXTERN && n.X.(*ir.Name).Readonly():
 		// n.Left is a readonly global; use it directly.
 		value = n.X
 	case !fromType.IsInterface() && n.Esc() == ir.EscNone && fromType.Width <= 1024:
diff --git a/src/cmd/compile/internal/walk/expr.go b/src/cmd/compile/internal/walk/expr.go
index 8a56526a36..3dffb496e9 100644
--- a/src/cmd/compile/internal/walk/expr.go
+++ b/src/cmd/compile/internal/walk/expr.go
@@ -52,7 +52,7 @@ func walkExpr(n ir.Node, init *ir.Nodes) ir.Node {
 		base.Fatalf("expression has untyped type: %+v", n)
 	}
 
-	if n.Op() == ir.ONAME && n.(*ir.Name).Class_ == ir.PAUTOHEAP {
+	if n.Op() == ir.ONAME && n.(*ir.Name).Class == ir.PAUTOHEAP {
 		n := n.(*ir.Name)
 		nn := ir.NewStarExpr(base.Pos, n.Heapaddr)
 		nn.X.MarkNonNil()
diff --git a/src/cmd/compile/internal/walk/order.go b/src/cmd/compile/internal/walk/order.go
index 2164685cd4..38a9bec6e3 100644
--- a/src/cmd/compile/internal/walk/order.go
+++ b/src/cmd/compile/internal/walk/order.go
@@ -235,7 +235,7 @@ func (o *orderState) safeExpr(n ir.Node) ir.Node {
 // because we emit explicit VARKILL instructions marking the end of those
 // temporaries' lifetimes.
 func isaddrokay(n ir.Node) bool {
-	return ir.IsAddressable(n) && (n.Op() != ir.ONAME || n.(*ir.Name).Class_ == ir.PEXTERN || ir.IsAutoTmp(n))
+	return ir.IsAddressable(n) && (n.Op() != ir.ONAME || n.(*ir.Name).Class == ir.PEXTERN || ir.IsAutoTmp(n))
 }
 
 // addrTemp ensures that n is okay to pass by address to runtime routines.
diff --git a/src/cmd/compile/internal/walk/race.go b/src/cmd/compile/internal/walk/race.go
index 20becf9be9..77cabe50c6 100644
--- a/src/cmd/compile/internal/walk/race.go
+++ b/src/cmd/compile/internal/walk/race.go
@@ -39,7 +39,7 @@ func instrument(fn *ir.Func) {
 			// race in the future.
 
 			nodpc := ir.NewNameAt(src.NoXPos, typecheck.Lookup(".fp"))
-			nodpc.Class_ = ir.PPARAM
+			nodpc.Class = ir.PPARAM
 			nodpc.SetUsed(true)
 			nodpc.SetType(types.Types[types.TUINTPTR])
 			nodpc.SetFrameOffset(int64(-types.PtrSize))
diff --git a/src/cmd/compile/internal/walk/stmt.go b/src/cmd/compile/internal/walk/stmt.go
index 460c0a7c10..1df491bd4e 100644
--- a/src/cmd/compile/internal/walk/stmt.go
+++ b/src/cmd/compile/internal/walk/stmt.go
@@ -176,7 +176,7 @@ func walkStmtList(s []ir.Node) {
 // walkDecl walks an ODCL node.
 func walkDecl(n *ir.Decl) ir.Node {
 	v := n.X
-	if v.Class_ == ir.PAUTOHEAP {
+	if v.Class == ir.PAUTOHEAP {
 		if base.Flag.CompilingRuntime {
 			base.Errorf("%v escapes to heap, not allowed in runtime", v)
 		}
diff --git a/src/cmd/compile/internal/walk/walk.go b/src/cmd/compile/internal/walk/walk.go
index 57c2d43753..928b673752 100644
--- a/src/cmd/compile/internal/walk/walk.go
+++ b/src/cmd/compile/internal/walk/walk.go
@@ -61,7 +61,7 @@ func Walk(fn *ir.Func) {
 
 func paramoutheap(fn *ir.Func) bool {
 	for _, ln := range fn.Dcl {
-		switch ln.Class_ {
+		switch ln.Class {
 		case ir.PPARAMOUT:
 			if ir.IsParamStackCopy(ln) || ln.Addrtaken() {
 				return true
@@ -137,7 +137,7 @@ func paramstoheap(params *types.Type) []ir.Node {
 
 		if stackcopy := v.Name().Stackcopy; stackcopy != nil {
 			nn = append(nn, walkStmt(ir.NewDecl(base.Pos, ir.ODCL, v.(*ir.Name))))
-			if stackcopy.Class_ == ir.PPARAM {
+			if stackcopy.Class == ir.PPARAM {
 				nn = append(nn, walkStmt(typecheck.Stmt(ir.NewAssignStmt(base.Pos, v, stackcopy))))
 			}
 		}
@@ -185,7 +185,7 @@ func returnsfromheap(params *types.Type) []ir.Node {
 		if v == nil {
 			continue
 		}
-		if stackcopy := v.Name().Stackcopy; stackcopy != nil && stackcopy.Class_ == ir.PPARAMOUT {
+		if stackcopy := v.Name().Stackcopy; stackcopy != nil && stackcopy.Class == ir.PPARAMOUT {
 			nn = append(nn, walkStmt(typecheck.Stmt(ir.NewAssignStmt(base.Pos, stackcopy, v))))
 		}
 	}