Merge pull request #1534 from freechipsproject/deprecate-transform-2

Trait-base Dependency API Migration

1 files changed, 7 insertions, 3 deletions

diff --git a/src/main/scala/firrtl/transforms/Flatten.scala b/src/main/scala/firrtl/transforms/Flatten.scala
index 68cfa3d0..8826a370 100644
--- a/src/main/scala/firrtl/transforms/Flatten.scala
+++ b/src/main/scala/firrtl/transforms/Flatten.scala
@@ -7,7 +7,9 @@ import firrtl.ir._
 import firrtl.Mappers._
 import firrtl.annotations._
 import scala.collection.mutable
+import firrtl.options.PreservesAll
 import firrtl.passes.{InlineInstances,PassException}
+import firrtl.stage.Forms
 
 /** Tags an annotation to be consumed by this transform */
 case class FlattenAnnotation(target: Named) extends SingleTargetAnnotation[Named] {
@@ -22,9 +24,11 @@ case class FlattenAnnotation(target: Named) extends SingleTargetAnnotation[Named
   * @note Flattening a module means inlining all its fully-defined child instances
   * @note Instances of extmodules are not (and cannot be) inlined
   */
-class Flatten extends Transform {
-   def inputForm = LowForm
-   def outputForm = LowForm
+class Flatten extends Transform with DependencyAPIMigration with PreservesAll[Transform] {
+
+   override def prerequisites = Forms.LowForm
+   override def optionalPrerequisites = Seq.empty
+   override def dependents = Forms.LowEmitters
 
    val inlineTransform = new InlineInstances