Add ground type serializer (#1502)

* update JsonProtocolSpec to test GroundType

* add custom serializer for GroundType

* get rid of trailing comma

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/main/scala/firrtl/annotations/JsonProtocol.scala b/src/main/scala/firrtl/annotations/JsonProtocol.scala
index 312b826a..941bf003 100644
--- a/src/main/scala/firrtl/annotations/JsonProtocol.scala
+++ b/src/main/scala/firrtl/annotations/JsonProtocol.scala
@@ -122,6 +122,10 @@ object JsonProtocol {
     { case JString(s) => Parser.parseInfo(s) },
     { case info: Info => JString(info.serialize) }
   ))
+  class GroundTypeSerializer extends CustomSerializer[GroundType](format => (
+    { case JString(s) => Parser.parseType(s).asInstanceOf[GroundType] },
+    { case tpe: GroundType => JString(tpe.serialize) }
+  ))
 
   /** Construct Json formatter for annotations */
   def jsonFormat(tags: Seq[Class[_]]) = {
@@ -133,7 +137,7 @@ object JsonProtocol {
       new LoadMemoryFileTypeSerializer + new IsModuleSerializer + new IsMemberSerializer +
       new CompleteTargetSerializer + new TypeSerializer + new ExpressionSerializer +
       new StatementSerializer + new PortSerializer + new DefModuleSerializer +
-      new CircuitSerializer + new InfoSerializer
+      new CircuitSerializer + new InfoSerializer + new GroundTypeSerializer
   }
 
   /** Serialize annotations to a String for emission */