[dev.typeparams] cmd/compile: add ir.TypeNodeAt

This CL adds a variant of ir.TypeNode that allows specifying position
information. This shouldn't normally be needed/used, but it's
occasionally helpful for writing code that passes toolstash -cmp.

Change-Id: I2be5da0339fd1ec2bee01d6c5310bd2ef58c46b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/327049
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/src/cmd/compile/internal/ir/type.go b/src/cmd/compile/internal/ir/type.go
index a903ea8cd4..431468375a 100644
--- a/src/cmd/compile/internal/ir/type.go
+++ b/src/cmd/compile/internal/ir/type.go
@@ -300,11 +300,22 @@ func (n *typeNode) CanBeNtype()       {}
 
 // TypeNode returns the Node representing the type t.
 func TypeNode(t *types.Type) Ntype {
+	return TypeNodeAt(src.NoXPos, t)
+}
+
+// TypeNodeAt is like TypeNode, but allows specifying the position
+// information if a new OTYPE needs to be constructed.
+//
+// Deprecated: Use TypeNode instead. For typical use, the position for
+// an anonymous OTYPE node should not matter. However, TypeNodeAt is
+// available for use with toolstash -cmp to refactor existing code
+// that is sensitive to OTYPE position.
+func TypeNodeAt(pos src.XPos, t *types.Type) Ntype {
 	if n := t.Obj(); n != nil {
 		if n.Type() != t {
 			base.Fatalf("type skew: %v has type %v, but expected %v", n, n.Type(), t)
 		}
 		return n.(Ntype)
 	}
-	return newTypeNode(src.NoXPos, t)
+	return newTypeNode(pos, t)
 }