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package firrtl
package transforms
import firrtl.annotations._
import firrtl.passes.PassException
/** A component that should be preserved
*
* DCE treats the component as a top-level sink of the circuit
*/
object DontTouchAnnotation {
private val marker = "DONTtouch!"
def apply(target: ComponentName): Annotation = Annotation(target, classOf[Transform], marker)
def unapply(a: Annotation): Option[ComponentName] = a match {
case Annotation(component: ComponentName, _, value) if value == marker => Some(component)
case _ => None
}
class DontTouchNotFoundException(module: String, component: String) extends PassException(
s"Component marked DONT Touch ($module.$component) not found!\n" +
"Perhaps it is an aggregate type? Currently only leaf components are supported.\n" +
"Otherwise it was probably accidentally deleted. Please check that your custom passes 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
*/
object OptimizableExtModuleAnnotation {
private val marker = "optimizableExtModule!"
def apply(target: ModuleName): Annotation = Annotation(target, classOf[Transform], marker)
def unapply(a: Annotation): Option[ModuleName] = a match {
case Annotation(component: ModuleName, _, value) if value == marker => Some(component)
case _ => None
}
}
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