From c5861176887bfa529277e686df09a42aeceb6cd7 Mon Sep 17 00:00:00 2001
From: Jack Koenig
Date: Thu, 29 Apr 2021 16:18:06 -0700
Subject: Scala 2.13 support (#1751)

---
 core/src/main/scala/chisel3/internal/Binding.scala |  4 ++--
 core/src/main/scala/chisel3/internal/Builder.scala |  2 +-
 core/src/main/scala/chisel3/internal/Error.scala   |  6 +++---
 core/src/main/scala/chisel3/internal/Namer.scala   | 14 ++++++++++----
 4 files changed, 16 insertions(+), 10 deletions(-)

(limited to 'core/src/main/scala/chisel3/internal')

diff --git a/core/src/main/scala/chisel3/internal/Binding.scala b/core/src/main/scala/chisel3/internal/Binding.scala
index 8a3c4330..300803ce 100644
--- a/core/src/main/scala/chisel3/internal/Binding.scala
+++ b/core/src/main/scala/chisel3/internal/Binding.scala
@@ -6,7 +6,7 @@ import chisel3._
 import chisel3.experimental.BaseModule
 import chisel3.internal.firrtl.LitArg
 
-import scala.collection.immutable.ListMap
+import scala.collection.immutable.VectorMap
 
 /** Requires that a node is hardware ("bound")
   */
@@ -126,4 +126,4 @@ case class ElementLitBinding(litArg: LitArg) extends LitBinding
 // Literal binding attached to the root of a Bundle, containing literal values of its children.
 case class BundleLitBinding(litMap: Map[Data, LitArg]) extends LitBinding
 // Literal binding attached to the root of a Vec, containing literal values of its children.
-case class VecLitBinding(litMap: ListMap[Data, LitArg]) extends LitBinding
+case class VecLitBinding(litMap: VectorMap[Data, LitArg]) extends LitBinding
diff --git a/core/src/main/scala/chisel3/internal/Builder.scala b/core/src/main/scala/chisel3/internal/Builder.scala
index 084bdc88..e1e4d460 100644
--- a/core/src/main/scala/chisel3/internal/Builder.scala
+++ b/core/src/main/scala/chisel3/internal/Builder.scala
@@ -655,7 +655,7 @@ private[chisel3] object Builder extends LazyLogging {
       errors.checkpoint()
       logger.warn("Done elaborating.")
 
-      (Circuit(components.last.name, components, annotations), mod)
+      (Circuit(components.last.name, components.toSeq, annotations.toSeq), mod)
     }
   }
   initializeSingletons()
diff --git a/core/src/main/scala/chisel3/internal/Error.scala b/core/src/main/scala/chisel3/internal/Error.scala
index 134f4c87..454be360 100644
--- a/core/src/main/scala/chisel3/internal/Error.scala
+++ b/core/src/main/scala/chisel3/internal/Error.scala
@@ -45,7 +45,7 @@ object ExceptionHelpers {
       }
 
       // Step 1: Remove elements from the top in the package trimlist
-      ((a: Array[StackTraceElement]) => a.view.dropWhile(inTrimlist))
+      ((a: Array[StackTraceElement]) => a.dropWhile(inTrimlist))
       // Step 2: Optionally remove elements from the bottom until the anchor
         .andThen(_.reverse)
         .andThen( a =>
@@ -125,10 +125,10 @@ class ChiselException(message: String, cause: Throwable = null) extends Exceptio
     }
 
     val trimmedLeft = throwable.getStackTrace().view.dropWhile(isBlacklisted)
-    val trimmedReverse = trimmedLeft.reverse
+    val trimmedReverse = trimmedLeft.toIndexedSeq.reverse.view
       .dropWhile(ste => !ste.getClassName.startsWith(builderName))
       .dropWhile(isBlacklisted)
-    trimmedReverse.reverse.toArray
+    trimmedReverse.toIndexedSeq.reverse.toArray
   }
 
   def chiselStackTrace: String = {
diff --git a/core/src/main/scala/chisel3/internal/Namer.scala b/core/src/main/scala/chisel3/internal/Namer.scala
index 1694d71d..c6e36cb6 100644
--- a/core/src/main/scala/chisel3/internal/Namer.scala
+++ b/core/src/main/scala/chisel3/internal/Namer.scala
@@ -8,9 +8,8 @@ import chisel3.experimental.NoChiselNamePrefix
 import scala.collection.mutable.Stack
 import scala.collection.mutable.ListBuffer
 
-import scala.collection.JavaConversions._
-
 import java.util.IdentityHashMap
+import scala.collection.JavaConverters._
 
 /** Recursive Function Namer overview
   *
@@ -81,7 +80,14 @@ class NamingContext extends NamingContextInterface {
   def addDescendant(ref: Any, descendant: NamingContext) {
     ref match {
       case ref: AnyRef =>
-        descendants.getOrElseUpdate(ref, ListBuffer[NamingContext]()) += descendant
+        // getOrElseUpdate
+        val l = descendants.get(ref)
+        val buf = if (l != null) l else {
+          val value = ListBuffer[NamingContext]()
+          descendants.put(ref, value)
+          value
+        }
+        buf += descendant
       case _ => anonymousDescendants += descendant
     }
   }
@@ -111,7 +117,7 @@ class NamingContext extends NamingContextInterface {
       }
     }
 
-    for (descendant <- descendants.values().flatten) {
+    for (descendant <- descendants.values.asScala.flatten) {
       // Where we have a broken naming link, just ignore the missing parts
       descendant.namePrefix(prefix)
     }
-- 
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