cmd/compile: make Afunclit the default/only behavior for Naddr

Naddr used to translate PFUNC Nodes into references to the function
literal wrapper, and then Afunclit could be used to rewrite it to
reference the function text itself. But now everywhere we use Naddr on
PFUNC Nodes, we immediately call Afunclit anyway. So just merge
Afunclit's behavior into Naddr.

Passes toolstash/buildall.

Change-Id: If2ca6d7f314c1a0711df9b8209aace16ba4b8bc0
Reviewed-on: https://go-review.googlesource.com/30073
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -74,9 +74,7 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64, r0 *uint32) *obj.Pr
 		p = gc.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, 4+frame+lo, obj.TYPE_REG, arm.REG_R1, 0)
 		p.Reg = arm.REGSP
 		p = gc.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
-		f := gc.Sysfunc("duffzero")
-		gc.Naddr(&p.To, f)
-		gc.Afunclit(&p.To, f)
+		gc.Naddr(&p.To, gc.Sysfunc("duffzero"))
 		p.To.Offset = 4 * (128 - cnt/int64(gc.Widthptr))
 	} else {
 		p = gc.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, 4+frame+lo, obj.TYPE_REG, arm.REG_R1, 0)

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

@@ -81,9 +81,7 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64) *obj.Prog {
 		p = gc.Appendpp(p, arm64.AADD, obj.TYPE_CONST, 0, 8+frame+lo-8, obj.TYPE_REG, arm64.REGRT1, 0)
 		p.Reg = arm64.REGRT1
 		p = gc.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
-		f := gc.Sysfunc("duffzero")
-		gc.Naddr(&p.To, f)
-		gc.Afunclit(&p.To, f)
+		gc.Naddr(&p.To, gc.Sysfunc("duffzero"))
 		p.To.Offset = 4 * (128 - cnt/int64(gc.Widthptr))
 	} else {
 		p = gc.Appendpp(p, arm64.AMOVD, obj.TYPE_CONST, 0, 8+frame+lo-8, obj.TYPE_REG, arm64.REGTMP, 0)

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

@@ -52,13 +52,6 @@ func Prog(as obj.As) *obj.Prog {
 	return p
 }
 
-func Afunclit(a *obj.Addr, n *Node) {
-	if a.Type == obj.TYPE_ADDR && a.Name == obj.NAME_EXTERN {
-		a.Type = obj.TYPE_MEM
-		a.Sym = Linksym(n.Sym)
-	}
-}
-
 func Clearp(p *obj.Prog) {
 	obj.Nopout(p)
 	p.As = obj.AEND
@@ -210,7 +203,7 @@ func Naddr(a *obj.Addr, n *Node) {
 		default:
 			Fatalf("naddr: ONAME class %v %d\n", n.Sym, n.Class)
 
-		case PEXTERN:
+		case PEXTERN, PFUNC:
 			a.Name = obj.NAME_EXTERN
 
 		case PAUTO:
@@ -218,11 +211,6 @@ func Naddr(a *obj.Addr, n *Node) {
 
 		case PPARAM, PPARAMOUT:
 			a.Name = obj.NAME_PARAM
-
-		case PFUNC:
-			a.Name = obj.NAME_EXTERN
-			a.Type = obj.TYPE_ADDR
-			s = funcsym(s)
 		}
 
 		a.Sym = Linksym(s)

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

@@ -383,7 +383,6 @@ func compile(fn *Node) {
 		nam = nil
 	}
 	ptxt := Gins(obj.ATEXT, nam, &nod1)
-	Afunclit(&ptxt.From, Curfn.Func.Nname)
 	ptxt.From3 = new(obj.Addr)
 	if fn.Func.Dupok {
 		ptxt.From3.Offset |= obj.DUPOK

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

@@ -74,9 +74,7 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64) *obj.Prog {
 		p = gc.Appendpp(p, mips.AADDV, obj.TYPE_CONST, 0, 8+frame+lo-8, obj.TYPE_REG, mips.REGRT1, 0)
 		p.Reg = mips.REGSP
 		p = gc.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
-		f := gc.Sysfunc("duffzero")
-		gc.Naddr(&p.To, f)
-		gc.Afunclit(&p.To, f)
+		gc.Naddr(&p.To, gc.Sysfunc("duffzero"))
 		p.To.Offset = 8 * (128 - cnt/int64(gc.Widthptr))
 	} else {
 		//	ADDV	$(8+frame+lo-8), SP, r1

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

@@ -71,9 +71,7 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64) *obj.Prog {
 		p = gc.Appendpp(p, ppc64.AADD, obj.TYPE_CONST, 0, gc.Ctxt.FixedFrameSize()+frame+lo-8, obj.TYPE_REG, ppc64.REGRT1, 0)
 		p.Reg = ppc64.REGSP
 		p = gc.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
-		f := gc.Sysfunc("duffzero")
-		gc.Naddr(&p.To, f)
-		gc.Afunclit(&p.To, f)
+		gc.Naddr(&p.To, gc.Sysfunc("duffzero"))
 		p.To.Offset = 4 * (128 - cnt/int64(gc.Widthptr))
 	} else {
 		p = gc.Appendpp(p, ppc64.AMOVD, obj.TYPE_CONST, 0, gc.Ctxt.FixedFrameSize()+frame+lo-8, obj.TYPE_REG, ppc64.REGTMP, 0)