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package firrtl
package transforms
import firrtl.annotations._
import firrtl.passes.PassException
import firrtl.transforms
/** Indicate that DCE should not be run */
case object NoDCEAnnotation extends NoTargetAnnotation
/** A component that should be preserved
*
* DCE treats the component as a top-level sink of the circuit
*/
case class DontTouchAnnotation(target: ReferenceTarget) extends SingleTargetAnnotation[ReferenceTarget] {
def targets = Seq(target)
def duplicate(n: ReferenceTarget) = this.copy(n)
}
object DontTouchAnnotation {
class DontTouchNotFoundException(module: String, component: String) extends PassException(
s"Target marked dontTouch ($module.$component) not found!\n" +
"It was probably accidentally deleted. Please check that your custom transforms are not" +
"responsible and then file an issue on Github."
)
def errorNotFound(module: String, component: String) =
throw new DontTouchNotFoundException(module, component)
}
/** An [[firrtl.ir.ExtModule]] that can be optimized
*
* Firrtl does not know the semantics of an external module. This annotation provides some
* "greybox" information that the external module does not have any side effects. In particular,
* this means that the external module can be Dead Code Eliminated.
*
* @note Unlike [[DontTouchAnnotation]], we don't care if the annotation is deleted
*/
case class OptimizableExtModuleAnnotation(target: ModuleName) extends
SingleTargetAnnotation[ModuleName] {
def duplicate(n: ModuleName) = this.copy(n)
}
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