From e8cf75f10b51557a03462b3720ca3b61cbbb9beb Mon Sep 17 00:00:00 2001
From: Kevin Laeufer
Date: Tue, 28 Jul 2020 10:02:26 -0700
Subject: [2.13] EmissionOptionMap now uses a HashMap instead of extending it

Extending HashMap is discouraged.
---
 src/main/scala/firrtl/Emitter.scala | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/main/scala/firrtl/Emitter.scala b/src/main/scala/firrtl/Emitter.scala
index da1cb83e..2788173a 100644
--- a/src/main/scala/firrtl/Emitter.scala
+++ b/src/main/scala/firrtl/Emitter.scala
@@ -470,13 +470,15 @@ class VerilogEmitter extends SeqTransform with Emitter {
     * Store Emission option per Target
     * Guarantee only one emission option per Target 
     */
-  private[firrtl] class EmissionOptionMap[V <: EmissionOption](val df : V) extends collection.mutable.HashMap[ReferenceTarget, V] {
-    override def default(key: ReferenceTarget) = df
-    override def +=(elem : (ReferenceTarget, V)) : EmissionOptionMap.this.type = {
-      if (this.contains(elem._1))
-        throw EmitterException(s"Multiple EmissionOption for the target ${elem._1} (${this(elem._1)} ; ${elem._2})")
-      super.+=(elem)
-    } 
+  private[firrtl] class EmissionOptionMap[V <: EmissionOption](val df : V) {
+    private val m = collection.mutable.HashMap[ReferenceTarget, V]().withDefaultValue(df)
+    def +=(elem : (ReferenceTarget, V)) : EmissionOptionMap.this.type = {
+      if (m.contains(elem._1))
+        throw EmitterException(s"Multiple EmissionOption for the target ${elem._1} (${m(elem._1)} ; ${elem._2})")
+      m += (elem)
+      this
+    }
+    def apply(key: ReferenceTarget): V = m.apply(key)
   }
   
   /** Provide API to retrieve EmissionOptions based on the provided [[AnnotationSeq]]
-- 
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