1 files changed, 27 insertions, 0 deletions
diff --git a/src/main/scala/logger/phases/AddDefaults.scala b/src/main/scala/logger/phases/AddDefaults.scala
new file mode 100644
index 00000000..f6daa811
--- /dev/null
+++ b/src/main/scala/logger/phases/AddDefaults.scala
@@ -0,0 +1,27 @@
+// See LICENSE for license details.
+
+package logger.phases
+
+import firrtl.AnnotationSeq
+import firrtl.options.Phase
+
+import logger.{LoggerOption, LogLevelAnnotation}
+
+/** Add default logger [[Annotation]]s */
+private [logger] object AddDefaults extends Phase {
+
+  /** Add missing default [[Logger]] [[Annotation]]s to an [[AnnotationSeq]]
+    * @param annotations input annotations
+    * @return output annotations with defaults
+    */
+  def transform(annotations: AnnotationSeq): AnnotationSeq = {
+    var ll = true
+    annotations.collect{ case a: LoggerOption => a }.map{
+      case _: LogLevelAnnotation => ll = false
+      case _                     =>
+    }
+    annotations ++
+      (if (ll) Seq(LogLevelAnnotation()) else Seq() )
+  }
+
+}