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config: support default values for Field[T] keys

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This commit is contained in:
Wesley W. Terpstra
2017-09-07 13:29:59 -07:00
parent 09d8d476c5
commit 655a08f12e
1 changed files with 6 additions and 2 deletions
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8
src/main/scala/config/Config.scala
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@@ -2,7 +2,11 @@
package freechips.rocketchip.config package freechips.rocketchip.config
abstract class Field[T] abstract class Field[T] private (val default: Option[T])
{
def this() = this(None)
def this(x: T) = this(Some(x))
}
abstract class View { abstract class View {
final def apply[T](pname: Field[T]): T = apply(pname, this) final def apply[T](pname: Field[T]): T = apply(pname, this)
@@ -42,7 +46,7 @@ class Config(p: Parameters) extends Parameters {
// Internal implementation: // Internal implementation:
private class TerminalView extends View { private class TerminalView extends View {
def find[T](pname: Field[T], site: View): Option[T] = None def find[T](pname: Field[T], site: View): Option[T] = pname.default
} }
private class ChainView(head: Parameters, tail: View) extends View { private class ChainView(head: Parameters, tail: View) extends View {