Merge pull request #1123 from freechipsproject/dependency-api-2

- Use Dependency API for transform scheduling
- Add tests that old order/behavior is preserved

Or: "Now you're thinking with dependencies."

1 files changed, 6 insertions, 2 deletions

diff --git a/src/main/scala/firrtl/transforms/Dedup.scala b/src/main/scala/firrtl/transforms/Dedup.scala
index 0667a184..5caa9228 100644
--- a/src/main/scala/firrtl/transforms/Dedup.scala
+++ b/src/main/scala/firrtl/transforms/Dedup.scala
@@ -9,7 +9,7 @@ import firrtl.analyses.InstanceGraph
 import firrtl.annotations._
 import firrtl.passes.{InferTypes, MemPortUtils}
 import firrtl.Utils.throwInternalError
-import firrtl.options.{HasShellOptions, ShellOption}
+import firrtl.options.{HasShellOptions, PreservesAll, ShellOption}
 
 // Datastructures
 import scala.collection.mutable
@@ -39,10 +39,14 @@ case object NoCircuitDedupAnnotation extends NoTargetAnnotation with HasShellOpt
   * Specifically, the restriction of instance loops must have been checked, or else this pass can
   *  infinitely recurse
   */
-class DedupModules extends Transform {
+class DedupModules extends Transform with PreservesAll[Transform] {
   def inputForm: CircuitForm = HighForm
   def outputForm: CircuitForm = HighForm
 
+  override val prerequisites = firrtl.stage.Forms.Resolved
+
+  override val dependents = Seq.empty
+
   /** Deduplicate a Circuit
     * @param state Input Firrtl AST
     * @return A transformed Firrtl AST