[svsim] Add a common type for Backend Settings

Add a shared super type for Backend Settings.  This allows for functions
to be written which operate on the type of any backend settings as opposed
to having to only work on one.

This is building towards a more generic way of describing options to
Scalatest simulations.

Signed-off-by: Schuyler Eldridge <[email protected]>

Author: seldridge

svsim/src/main/scala/Backend.scala

@@ -70,7 +70,7 @@ object CommonCompilationSettings {
 }
 
 trait Backend {
-  type CompilationSettings
+  type CompilationSettings <: Backend.Settings
   def generateParameters(
     outputBinaryName:        String,
     topModuleName:           String,
@@ -94,6 +94,9 @@ trait Backend {
 
 final object Backend {
 
+  /** The super type of all backend-specific settings. */
+  trait Settings extends Product
+
   final case class Parameters(
     private[svsim] val compilerPath:         String,
     private[svsim] val compilerInvocation:   Parameters.Invocation,

svsim/src/main/scala/vcs/Backend.scala

@@ -67,7 +67,7 @@ object Backend {
     licenceExpireWarningTimeout: Option[Int] = None,
     archOverride:                Option[String] = None,
     waitForLicenseIfUnavailable: Boolean = false
-  )
+  ) extends svsim.Backend.Settings
 
   def initializeFromProcessEnvironment() = {
     (sys.env.get("VCS_HOME"), sys.env.get("LM_LICENSE_FILE")) match {

svsim/src/main/scala/verilator/Backend.scala

@@ -21,7 +21,7 @@ object Backend {
     disabledWarnings:           Seq[String] = Seq(),
     disableFatalExitOnWarnings: Boolean = false,
     enableAllAssertions:        Boolean = false
-  )
+  ) extends svsim.Backend.Settings
 
   def initializeFromProcessEnvironment() = {
     val output = mutable.ArrayBuffer.empty[String]