cmd/compile: cleanup gdata slightly

In sinit.go, gdata can already handle strings and complex, so no
reason to handle them separately.

In obj.go, inline gdatastring and gdatacomplex into gdata, since it's
the only caller. Allows extracting out the common Linksym calls.

Passes toolstash -cmp.

Change-Id: I3cb18d9b4206a8a269c36e0d30a345d8e6caba1f
Reviewed-on: https://go-review.googlesource.com/31498
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

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

@@ -361,25 +361,19 @@ func gdata(nam *Node, nr *Node, wid int) {
 	if nam.Sym == nil {
 		Fatalf("gdata nil nam sym")
 	}
+	s := Linksym(nam.Sym)
 
 	switch nr.Op {
 	case OLITERAL:
 		switch u := nr.Val().U.(type) {
-		case *Mpcplx:
-			gdatacomplex(nam, u)
-
-		case string:
-			gdatastring(nam, u)
-
 		case bool:
 			i := int64(obj.Bool2int(u))
-			Linksym(nam.Sym).WriteInt(Ctxt, nam.Xoffset, wid, i)
+			s.WriteInt(Ctxt, nam.Xoffset, wid, i)
 
 		case *Mpint:
-			Linksym(nam.Sym).WriteInt(Ctxt, nam.Xoffset, wid, u.Int64())
+			s.WriteInt(Ctxt, nam.Xoffset, wid, u.Int64())
 
 		case *Mpflt:
-			s := Linksym(nam.Sym)
 			f := u.Float64()
 			switch nam.Type.Etype {
 			case TFLOAT32:
@@ -388,6 +382,23 @@ func gdata(nam *Node, nr *Node, wid int) {
 				s.WriteFloat64(Ctxt, nam.Xoffset, f)
 			}
 
+		case *Mpcplx:
+			r := u.Real.Float64()
+			i := u.Imag.Float64()
+			switch nam.Type.Etype {
+			case TCOMPLEX64:
+				s.WriteFloat32(Ctxt, nam.Xoffset, float32(r))
+				s.WriteFloat32(Ctxt, nam.Xoffset+4, float32(i))
+			case TCOMPLEX128:
+				s.WriteFloat64(Ctxt, nam.Xoffset, r)
+				s.WriteFloat64(Ctxt, nam.Xoffset+8, i)
+			}
+
+		case string:
+			symdata := stringsym(u)
+			s.WriteAddr(Ctxt, nam.Xoffset, Widthptr, symdata, 0)
+			s.WriteInt(Ctxt, nam.Xoffset+int64(Widthptr), Widthint, int64(len(u)))
+
 		default:
 			Fatalf("gdata unhandled OLITERAL %v", nr)
 		}
@@ -397,38 +408,15 @@ func gdata(nam *Node, nr *Node, wid int) {
 			Fatalf("gdata ADDR left op %v", nr.Left.Op)
 		}
 		to := nr.Left
-		Linksym(nam.Sym).WriteAddr(Ctxt, nam.Xoffset, wid, Linksym(to.Sym), to.Xoffset)
+		s.WriteAddr(Ctxt, nam.Xoffset, wid, Linksym(to.Sym), to.Xoffset)
 
 	case ONAME:
 		if nr.Class != PFUNC {
 			Fatalf("gdata NAME not PFUNC %d", nr.Class)
 		}
-		Linksym(nam.Sym).WriteAddr(Ctxt, nam.Xoffset, wid, Linksym(funcsym(nr.Sym)), nr.Xoffset)
+		s.WriteAddr(Ctxt, nam.Xoffset, wid, Linksym(funcsym(nr.Sym)), nr.Xoffset)
 
 	default:
 		Fatalf("gdata unhandled op %v %v\n", nr, nr.Op)
 	}
 }
-
-func gdatacomplex(nam *Node, cval *Mpcplx) {
-	t := Types[cplxsubtype(nam.Type.Etype)]
-	r := cval.Real.Float64()
-	i := cval.Imag.Float64()
-	s := Linksym(nam.Sym)
-
-	switch t.Etype {
-	case TFLOAT32:
-		s.WriteFloat32(Ctxt, nam.Xoffset, float32(r))
-		s.WriteFloat32(Ctxt, nam.Xoffset+4, float32(i))
-	case TFLOAT64:
-		s.WriteFloat64(Ctxt, nam.Xoffset, r)
-		s.WriteFloat64(Ctxt, nam.Xoffset+8, i)
-	}
-}
-
-func gdatastring(nam *Node, sval string) {
-	s := Linksym(nam.Sym)
-	symdata := stringsym(sval)
-	s.WriteAddr(Ctxt, nam.Xoffset, Widthptr, symdata, 0)
-	s.WriteInt(Ctxt, nam.Xoffset+int64(Widthptr), Widthint, int64(len(sval)))
-}

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

@@ -1409,32 +1409,11 @@ func genAsInitNoCheck(n *Node, reportOnly bool) bool {
 		return true
 
 	case OLITERAL:
-		break
-	}
-
-	switch nr.Type.Etype {
-	default:
-		return false
-
-	case TBOOL, TINT8, TUINT8, TINT16, TUINT16,
-		TINT32, TUINT32, TINT64, TUINT64,
-		TINT, TUINT, TUINTPTR, TUNSAFEPTR,
-		TPTR32, TPTR64,
-		TFLOAT32, TFLOAT64:
 		if !reportOnly {
 			gdata(&nam, nr, int(nr.Type.Width))
 		}
-
-	case TCOMPLEX64, TCOMPLEX128:
-		if !reportOnly {
-			gdatacomplex(&nam, nr.Val().U.(*Mpcplx))
-		}
-
-	case TSTRING:
-		if !reportOnly {
-			gdatastring(&nam, nr.Val().U.(string))
-		}
+		return true
 	}
 
-	return true
+	return false
 }