Remove chisel3's own firrtl Emitter, use firrtl Serializer

This will be slightly slower as it involves converting from Chisel
modules to FIRRTL modules before turning them into Strings. This cost is
somewhat mitigated by doing that conversion lazily such that we never
materialize the entire firrtl Circuit in memory, only 1 module at a
time.

1 files changed, 7 insertions, 0 deletions

diff --git a/core/src/main/scala/chisel3/internal/firrtl/Converter.scala b/core/src/main/scala/chisel3/internal/firrtl/Converter.scala
index 8efb2abc..f56c3b15 100644
--- a/core/src/main/scala/chisel3/internal/firrtl/Converter.scala
+++ b/core/src/main/scala/chisel3/internal/firrtl/Converter.scala
@@ -9,6 +9,7 @@ import chisel3.internal.{HasId, castToInt, throwException}
 
 import scala.annotation.tailrec
 import scala.collection.immutable.Queue
+import scala.collection.immutable.LazyList // Needed for 2.12 alias
 
 private[chisel3] object Converter {
   // TODO modeled on unpack method on Printable, refactor?
@@ -301,5 +302,11 @@ private[chisel3] object Converter {
 
   def convert(circuit: Circuit): fir.Circuit =
     fir.Circuit(fir.NoInfo, circuit.components.map(convert), circuit.name)
+
+  // TODO Unclear if this should just be the default
+  def convertLazily(circuit: Circuit): fir.Circuit = {
+    val lazyModules = LazyList() ++ circuit.components
+    fir.Circuit(fir.NoInfo, lazyModules.map(convert), circuit.name)
+  }
 }