src/main/scala/firrtl/options/phases/AddDefaults.scala


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// See LICENSE for license details.

package firrtl.options.phases

import firrtl.AnnotationSeq
import firrtl.options.{Dependency, Phase, TargetDirAnnotation}

/** Add default annotations for a [[Stage]]
  *
  * This currently only adds a [[TargetDirAnnotation]]. This isn't necessary for a [[StageOptionsView]], but downstream
  * tools may expect a [[TargetDirAnnotation]] to exist.
  */
class AddDefaults extends Phase {

  override def prerequisites = Seq(Dependency[GetIncludes], Dependency[ConvertLegacyAnnotations])

  override def optionalPrerequisiteOf = Seq.empty

  override def invalidates(a: Phase) = false

  def transform(annotations: AnnotationSeq): AnnotationSeq = {
    val td = annotations.collectFirst{ case a: TargetDirAnnotation => a}.isEmpty

    (if (td) Seq(TargetDirAnnotation()) else Seq()) ++
      annotations
  }

}