Add "mverilog" Compiler Option, Compiler Fixes

This adds "mverilog" to the "--compiler" command line option. This
will run the MinimumVerilogCompiler.

This additionally fixes the MinimumVerilogCompiler such that
DeadCodeElimination will not be run (it's not supposed to be). This is
done by adding a MinimumVerilogEmitter, subclassing VerilogVerilog,
that strips the DeadCodeElimination step from its parent.

Additionally, BlackBoxSourceHelper is removed from the
MinimumVerilogCompiler since this will be run by the VerilogEmitter
already.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/main/scala/firrtl/Emitter.scala b/src/main/scala/firrtl/Emitter.scala
index 67bd1583..8049e33c 100644
--- a/src/main/scala/firrtl/Emitter.scala
+++ b/src/main/scala/firrtl/Emitter.scala
@@ -882,3 +882,13 @@ class VerilogEmitter extends SeqTransform with Emitter {
     state.copy(annotations = newAnnos ++ state.annotations)
   }
 }
+
+class MinimumVerilogEmitter extends VerilogEmitter with Emitter {
+
+
+  override def transforms = super.transforms.filter{
+    case _: DeadCodeElimination => false
+    case _ => true
+  }
+
+}