Chisel plugin bundle elements handler (#2306) (#2380)

Adds generation of `Bundle.elements` method to the chores done by the compiler plugin
For each `Bundle` find the relevant visible Chisel field members and construct a
hard-coded list of the elements and their names implemented as `_elementsImpl`

For more details: See plugins/README.md

- Should be no change in API
- Handles inheritance and mixins
- Handles Seq[Data]
- Tests in BundleElementSpec

Co-authored-by: chick <chick.markley@sifive.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>
(cherry picked from commit 237200a420581519f29149cbae9b3e968c0d01fc)

Co-authored-by: Chick Markley <chick@qrhino.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/build.sc b/build.sc
index 1e665a9f..d7dbc6d7 100644
--- a/build.sc
+++ b/build.sc
@@ -107,6 +107,10 @@ class chisel3CrossModule(val crossScalaVersion: String) extends CommonModule wit
   object test extends Tests {
     override def scalacPluginClasspath = m.scalacPluginClasspath
 
+    override  def scalacOptions = T {
+      super.scalacOptions() ++ Agg("-P:chiselplugin:genBundleElements")
+    }
+
     override def ivyDeps = m.ivyDeps() ++ Agg(
       ivy"org.scalatest::scalatest:3.2.10",
       ivy"org.scalatestplus::scalacheck-1-14:3.2.2.0",