Protobuf (#832)

Add support for ProtoBuf serialization and deserialization

* Add support for additional features in .proto description

Features added: Info, Fixed[Type|Literal], AnalogType, Attach, Params

* Add support for .pb input files

This involves an API change where FIRRTL no longer implicitly adds .fir
to input file names

1 files changed, 15 insertions, 1 deletions

diff --git a/src/main/scala/firrtl/Driver.scala b/src/main/scala/firrtl/Driver.scala
index 97d0ce4e..2315ad55 100644
--- a/src/main/scala/firrtl/Driver.scala
+++ b/src/main/scala/firrtl/Driver.scala
@@ -148,6 +148,16 @@ object Driver {
     LegacyAnnotation.convertLegacyAnnos(annos)
   }
 
+  private sealed trait FileExtension
+  private case object FirrtlFile extends FileExtension
+  private case object ProtoBufFile extends FileExtension
+
+  private def getFileExtension(filename: String): FileExtension =
+    filename.drop(filename.lastIndexOf('.')) match {
+      case ".pb" => ProtoBufFile
+      case _ => FirrtlFile // Default to FIRRTL File
+    }
+
   // Useful for handling erros in the options
   case class OptionsException(msg: String) extends Exception(msg)
 
@@ -183,7 +193,11 @@ object Driver {
           }
           val inputFileName = firrtlConfig.getInputFileName(optionsManager)
           try {
-            Parser.parseFile(inputFileName, firrtlConfig.infoMode)
+            // TODO What does InfoMode mean to ProtoBuf?
+            getFileExtension(inputFileName) match {
+              case ProtoBufFile => proto.FromProto.fromFile(inputFileName)
+              case FirrtlFile => Parser.parseFile(inputFileName, firrtlConfig.infoMode)
+            }
           }
           catch {
             case _: FileNotFoundException =>