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, 7 insertions, 1 deletions

diff --git a/src/main/scala/firrtl/passes/CheckWidths.scala b/src/main/scala/firrtl/passes/CheckWidths.scala
index 6ceac032..b750196a 100644
--- a/src/main/scala/firrtl/passes/CheckWidths.scala
+++ b/src/main/scala/firrtl/passes/CheckWidths.scala
@@ -9,8 +9,14 @@ import firrtl.traversals.Foreachers._
 import firrtl.Utils._
 import firrtl.constraint.IsKnown
 import firrtl.annotations.{CircuitTarget, ModuleTarget, Target, TargetToken}
+import firrtl.options.{Dependency, PreservesAll}
+
+object CheckWidths extends Pass with PreservesAll[Transform] {
+
+  override val prerequisites = Dependency[passes.InferWidths] +: firrtl.stage.Forms.WorkingIR
+
+  override val dependents = Seq(Dependency[transforms.InferResets])
 
-object CheckWidths extends Pass {
   /** The maximum allowed width for any circuit element */
   val MaxWidth = 1000000
   val DshlMaxWidth = getUIntWidth(MaxWidth)