cmd/compile: move Heapaddr field from Name to Param

No performance impact, just cleanup.

Passes toolstash -cmp.

Change-Id: Ic7957d2686de53a9680c2bdefe926cccccd73a5c
Reviewed-on: https://go-review.googlesource.com/36316
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -347,7 +347,7 @@ func transformclosure(xfunc *Node) {
 				addr := newname(lookupf("&%s", v.Sym.Name))
 				addr.Type = ptrto(v.Type)
 				addr.Class = PPARAM
-				v.Name.Heapaddr = addr
+				v.Name.Param.Heapaddr = addr
 				fld.Nname = addr
 			}
 
@@ -405,7 +405,7 @@ func transformclosure(xfunc *Node) {
 				addr.Used = true
 				addr.Name.Curfn = xfunc
 				xfunc.Func.Dcl = append(xfunc.Func.Dcl, addr)
-				v.Name.Heapaddr = addr
+				v.Name.Param.Heapaddr = addr
 				if v.Name.Byval {
 					cv = nod(OADDR, cv, nil)
 				}

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

@@ -87,7 +87,7 @@ func addrescapes(n *Node) {
 // isParamStackCopy reports whether this is the on-stack copy of a
 // function parameter that moved to the heap.
 func (n *Node) isParamStackCopy() bool {
-	return n.Op == ONAME && (n.Class == PPARAM || n.Class == PPARAMOUT) && n.Name.Heapaddr != nil
+	return n.Op == ONAME && (n.Class == PPARAM || n.Class == PPARAMOUT) && n.Name.Param.Heapaddr != nil
 }
 
 // isParamHeapCopy reports whether this is the on-heap copy of
@@ -137,7 +137,7 @@ func moveToHeap(n *Node) {
 		stackcopy.Type = n.Type
 		stackcopy.Xoffset = n.Xoffset
 		stackcopy.Class = n.Class
-		stackcopy.Name.Heapaddr = heapaddr
+		stackcopy.Name.Param.Heapaddr = heapaddr
 		if n.Class == 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.
@@ -174,7 +174,7 @@ func moveToHeap(n *Node) {
 	n.Class = PAUTOHEAP
 	n.Ullman = 2
 	n.Xoffset = 0
-	n.Name.Heapaddr = heapaddr
+	n.Name.Param.Heapaddr = heapaddr
 	n.Esc = EscHeap
 	if Debug['m'] != 0 {
 		fmt.Printf("%v: moved to heap: %v\n", n.Line(), n)

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

@@ -23,8 +23,8 @@ func TestSizeof(t *testing.T) {
 		_64bit uintptr     // size on 64bit platforms
 	}{
 		{Func{}, 100, 168},
-		{Name{}, 44, 72},
+		{Name{}, 40, 64},
-		{Param{}, 24, 48},
+		{Param{}, 28, 56},
 		{Node{}, 96, 152},
 		{Sym{}, 64, 120},
 		{Type{}, 64, 104},

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

@@ -189,7 +189,6 @@ func (n *Node) SetIota(x int64) {
 type Name struct {
 	Pack      *Node  // real package for import . names
 	Pkg       *Pkg   // pkg for OPACK nodes
-	Heapaddr  *Node  // temp holding heap address of param (could move to Param?)
 	Defn      *Node  // initializing assignment
 	Curfn     *Node  // function for local variables
 	Param     *Param // additional fields for ONAME, OTYPE
@@ -205,7 +204,8 @@ type Name struct {
 }
 
 type Param struct {
-	Ntype *Node
+	Ntype    *Node
+	Heapaddr *Node // temp holding heap address of param
 
 	// ONAME PAUTOHEAP
 	Stackcopy *Node // the PPARAM/PPARAMOUT on-stack slot (moved func params only)

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

@@ -231,7 +231,7 @@ func walkstmt(n *Node) *Node {
 			if prealloc[v] == nil {
 				prealloc[v] = callnew(v.Type)
 			}
-			nn := nod(OAS, v.Name.Heapaddr, prealloc[v])
+			nn := nod(OAS, v.Name.Param.Heapaddr, prealloc[v])
 			nn.Colas = true
 			nn = typecheck(nn, Etop)
 			return walkstmt(nn)
@@ -314,7 +314,7 @@ func walkstmt(n *Node) *Node {
 				}
 				if cl == PPARAMOUT {
 					if ln.isParamStackCopy() {
-						ln = walkexpr(typecheck(nod(OIND, ln.Name.Heapaddr, nil), Erv), nil)
+						ln = walkexpr(typecheck(nod(OIND, ln.Name.Param.Heapaddr, nil), Erv), nil)
 					}
 					rl = append(rl, ln)
 				}
@@ -463,7 +463,7 @@ func walkexpr(n *Node, init *Nodes) *Node {
 	}
 
 	if n.Op == ONAME && n.Class == PAUTOHEAP {
-		nn := nod(OIND, n.Name.Heapaddr, nil)
+		nn := nod(OIND, n.Name.Param.Heapaddr, nil)
 		nn = typecheck(nn, Erv)
 		nn = walkexpr(nn, init)
 		nn.Left.NonNil = true