cmd/compile/internal/gc: simplify generating static data

Passes toolstash -cmp.

Change-Id: I4a72e3e130c38868ee8ecef32cad58748aa5be52
Reviewed-on: https://go-review.googlesource.com/36353Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -1349,22 +1349,7 @@ func isvaluelit(n *Node) bool {
 	return n.Op == OARRAYLIT || n.Op == OSTRUCTLIT
 }
 
-// gen_as_init attempts to emit static data for n and reports whether it succeeded.
-// If reportOnly is true, it does not emit static data and does not modify the AST.
-func gen_as_init(n *Node, reportOnly bool) bool {
-	success := genAsInitNoCheck(n, reportOnly)
-	if !success && n.IsStatic {
-		Dump("\ngen_as_init", n)
-		Fatalf("gen_as_init couldn't generate static data")
-	}
-	return success
-}
-
-func genAsInitNoCheck(n *Node, reportOnly bool) bool {
-	if !n.IsStatic {
-		return false
-	}
-
+func genAsInitNoCheck(n *Node) bool {
 	nr := n.Right
 	nl := n.Left
 	if nr == nil {
@@ -1412,7 +1397,6 @@ func genAsInitNoCheck(n *Node, reportOnly bool) bool {
 			return false
 		}
 
-		if !reportOnly {
 		nam.Xoffset += int64(array_array)
 		gdata(&nam, ptr, Widthptr)
 
@@ -1423,14 +1407,11 @@ func genAsInitNoCheck(n *Node, reportOnly bool) bool {
 
 		nam.Xoffset += int64(array_cap) - int64(array_nel)
 		gdata(&nam, &nod1, Widthint)
-		}
 
 		return true
 
 	case OLITERAL:
-		if !reportOnly {
 		gdata(&nam, nr, int(nr.Type.Width))
-		}
 		return true
 	}
 }

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

@@ -643,9 +643,10 @@ func (s *state) stmt(n *Node) {
 
 	case OAS, OASWB:
 		// Generate static data rather than code, if possible.
-		if gen_as_init(n, true) {
-			if !gen_as_init(n, false) {
-				Fatalf("non-static data marked as static: %v\n\n", n)
+		if n.IsStatic {
+			if !genAsInitNoCheck(n) {
+				Dump("\ngen_as_init", n)
+				Fatalf("gen_as_init couldn't generate static data")
 			}
 			return
 		}