cmd/compile: improve typechecking of OSLICEHEADER nodes

Create a new node for OSLICEHEADER nodes to ensure typechecks are applied.
Add nil checks for OSLICEHEADER type and pointer parameters
for better error messages when these are not set.
Improve formatting of OSLICEHEADER nodes in compiler error messages.

Change-Id: Idea8f41bb4beb636f0e1fc381ff8d79b1d44fbae
Reviewed-on: https://go-review.googlesource.com/c/146997
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

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

@@ -1114,6 +1114,7 @@ var opprec = []int{
 	OSLICEARR:     8,
 	OSLICE3:       8,
 	OSLICE3ARR:    8,
+	OSLICEHEADER:  8,
 	ODOTINTER:     8,
 	ODOTMETH:      8,
 	ODOTPTR:       8,
@@ -1393,6 +1394,12 @@ func (n *Node) exprfmt(s fmt.State, prec int, mode fmtMode) {
 		}
 		fmt.Fprint(s, "]")
 
+	case OSLICEHEADER:
+		if n.List.Len() != 2 {
+			Fatalf("bad OSLICEHEADER list length %d", n.List.Len())
+		}
+		mode.Fprintf(s, "sliceheader{%v,%v,%v}", n.Left, n.List.First(), n.List.Second())
+
 	case OCOPY, OCOMPLEX:
 		mode.Fprintf(s, "%#v(%v, %v)", n.Op, n.Left, n.Right)
 

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

@@ -1160,11 +1160,15 @@ func typecheck1(n *Node, top int) (res *Node) {
 		ok |= Erv
 
 		t := n.Type
+		if t == nil {
+			Fatalf("no type specified for OSLICEHEADER")
+		}
+
 		if !t.IsSlice() {
 			Fatalf("invalid type %v for OSLICEHEADER", n.Type)
 		}
 
-		if !n.Left.Type.IsUnsafePtr() {
+		if n.Left == nil || n.Left.Type == nil || !n.Left.Type.IsUnsafePtr() {
 			Fatalf("need unsafe.Pointer for OSLICEHEADER")
 		}
 

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

@@ -1351,14 +1351,17 @@ opswitch:
 				argtype = types.Types[TINT]
 			}
 
+			m := nod(OSLICEHEADER, nil, nil)
+			m.Type = t
+
 			fn := syslook(fnname)
-			n.Left = mkcall1(fn, types.Types[TUNSAFEPTR], init, typename(t.Elem()), conv(len, argtype), conv(cap, argtype))
-			n.Left.SetNonNil(true)
-			n.List.Set2(conv(len, types.Types[TINT]), conv(cap, types.Types[TINT]))
-			n.Op = OSLICEHEADER
-			n.Type = t
-			n = typecheck(n, Erv)
-			n = walkexpr(n, init)
+			m.Left = mkcall1(fn, types.Types[TUNSAFEPTR], init, typename(t.Elem()), conv(len, argtype), conv(cap, argtype))
+			m.Left.SetNonNil(true)
+			m.List.Set2(conv(len, types.Types[TINT]), conv(cap, types.Types[TINT]))
+
+			m = typecheck(m, Erv)
+			m = walkexpr(m, init)
+			n = m
 		}
 
 	case ORUNESTR: