diplomacy: ValName captures val bindings for Nodes

macros/src/main/scala/ValName.scala

@@ -0,0 +1,22 @@
+// See LICENSE.SiFive for license details.
+
+package freechips.rocketchip.macros
+
+import scala.language.experimental.macros
+import scala.reflect.macros.blackbox.Context
+
+case class ValNameImpl(name: String)
+
+object ValNameImpl
+{
+  implicit def materialize: ValNameImpl = macro detail
+  def detail(c: Context): c.Expr[ValNameImpl] = {
+    import c.universe._
+    def allOwners(s: c.Symbol): Seq[c.Symbol] =
+      if (s == `NoSymbol`) Nil else s +: allOwners(s.owner)
+    val terms = allOwners(c.internal.enclosingOwner).filter(_.isTerm).map(_.asTerm)
+    terms.filter(_.isVal).map(_.name.toString).find(_(0) != '$').map { s =>
+      c.Expr[ValNameImpl] { q"_root_.freechips.rocketchip.macros.ValNameImpl(${s})" }
+    }.getOrElse(c.abort(c.enclosingPosition, "Not a valid application."))
+  }
+}