Merge pull request #912 from seldridge/c911

Make BaseModule.name lazy

1 files changed, 7 insertions, 1 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/core/Module.scala b/chiselFrontend/src/main/scala/chisel3/core/Module.scala
index 88013bae..3bdc86d6 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/Module.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/Module.scala
@@ -180,7 +180,13 @@ abstract class BaseModule extends HasId {
   def desiredName = this.getClass.getName.split('.').last
 
   /** Legalized name of this module. */
-  final val name = Builder.globalNamespace.name(desiredName)
+  final lazy val name = try {
+    Builder.globalNamespace.name(desiredName)
+  } catch {
+    case e: NullPointerException => throwException(
+      s"Error: desiredName of ${this.getClass.getName} is null. Did you evaluate 'name' before all values needed by desiredName were available?", e)
+    case t: Throwable => throw t
+  }
 
   /** Returns a FIRRTL ModuleName that references this object
     * @note Should not be called until circuit elaboration is complete