Mixin DependencyAPIMigration to all Transforms

This mixes in the new DependencyAPIMigration trait into all Transforms
and Passes. This enables in-tree transforms/passes to build without
deprecation warnings associated with the deprecated CircuitForm.

As a consequence of this, every Transform now has UnknownForm as both
its inputForm and outputForm. This PR modifies legacy Compiler and
testing infrastructure to schedule transforms NOT using
mergeTransforms/getLoweringTransforms (which rely on inputForm and
outputForm not being UnknownForm), but instead using the Dependency
API.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/src/main/scala/firrtl/annotations/transforms/EliminateTargetPaths.scala b/src/main/scala/firrtl/annotations/transforms/EliminateTargetPaths.scala
index 00f2ad6a..fe5090b2 100644
--- a/src/main/scala/firrtl/annotations/transforms/EliminateTargetPaths.scala
+++ b/src/main/scala/firrtl/annotations/transforms/EliminateTargetPaths.scala
@@ -9,7 +9,9 @@ import firrtl.annotations.TargetToken.{Instance, OfModule, fromDefModuleToTarget
 import firrtl.annotations.analysis.DuplicationHelper
 import firrtl.annotations._
 import firrtl.ir._
-import firrtl.{CircuitForm, CircuitState, FirrtlInternalException, HighForm, RenameMap, Transform, WDefInstance}
+import firrtl.{CircuitState, DependencyAPIMigration, FirrtlInternalException, RenameMap, Transform, WDefInstance}
+import firrtl.options.PreservesAll
+import firrtl.stage.Forms
 
 import scala.collection.mutable
 
@@ -41,11 +43,11 @@ case class NoSuchTargetException(message: String) extends FirrtlInternalExceptio
   * B/x -> (B/x, B_/x) // where x is any reference in B
   * C/x -> (C/x, C_/x) // where x is any reference in C
   */
-class EliminateTargetPaths extends Transform {
+class EliminateTargetPaths extends Transform with DependencyAPIMigration with PreservesAll[Transform] {
 
-  def inputForm: CircuitForm = HighForm
-
-  def outputForm: CircuitForm = HighForm
+  override def prerequisites = Forms.MinimalHighForm
+  override def optionalPrerequisites = Seq.empty
+  override def dependents = Seq.empty
 
   /** Replaces old ofModules with new ofModules by calling dupMap methods
     * Updates oldUsedOfModules, newUsedOfModules