graphML: reverse interrupt arrows

src/main/scala/diplomacy/LazyModule.scala

@@ -97,9 +97,19 @@ abstract class LazyModule()(implicit val p: Parameters)
     nodes.filter(!_.omitGraphML) foreach { n => n.outputs.filter(!_._1.omitGraphML).foreach { case (o, l) =>
       buf ++= pad
       buf ++= "<edge"
+      if (o.reverse) {
+        buf ++= s""" target=\"${index}::${n.index}\""""
+        buf ++= s""" source=\"${o.lazyModule.index}::${o.index}\">"""
+      } else {
         buf ++= s""" source=\"${index}::${n.index}\""""
-      buf ++= s""" target=\"${o.lazyModule.index}::${o.index}\"><data key=\"e\"><y:PolyLineEdge>"""
+        buf ++= s""" target=\"${o.lazyModule.index}::${o.index}\">"""
+      }
+      buf ++= s"""<data key=\"e\"><y:PolyLineEdge>"""
+      if (o.reverse) {
+        buf ++= s"""<y:Arrows source=\"standard\" target=\"none\"/>"""
+      } else {
         buf ++= s"""<y:Arrows source=\"none\" target=\"standard\"/>"""
+      }
       buf ++= s"""<y:LineStyle color=\"${o.colour}\" type=\"line\" width=\"1.0\"/>"""
       buf ++= s"""<y:EdgeLabel modelName=\"centered\" rotationAngle=\"270.0\">${l}</y:EdgeLabel>"""
       buf ++= s"""</y:PolyLineEdge></data></edge>\n"""

src/main/scala/diplomacy/Nodes.scala

@@ -17,6 +17,7 @@ trait InwardNodeImp[DI, UI, EI, BI <: Data]
   def edgeI(pd: DI, pu: UI): EI
   def bundleI(ei: EI): BI
   def colour: String
+  def reverse: Boolean = false
   def connect(bindings: () => Seq[(EI, BI, BI)])(implicit p: Parameters, sourceInfo: SourceInfo): (Option[LazyModule], () => Unit) = {
     (None, () => bindings().foreach { case (_, i, o) => i <> o })
   }
@@ -67,6 +68,7 @@ abstract class BaseNode
   protected[diplomacy] def outputs: Seq[(BaseNode, String)]
   protected[diplomacy] def inputs:  Seq[(BaseNode, String)]
   protected[diplomacy] def colour:  String
+  protected[diplomacy] def reverse: Boolean
 }
 
 case class NodeHandle[DI, UI, BI <: Data, DO, UO, BO <: Data]
@@ -261,6 +263,7 @@ abstract class MixedNode[DI, UI, EI, BI <: Data, DO, UO, EO, BO <: Data](
 
   // meta-data for printing the node graph
   protected[diplomacy] def colour  = inner.colour
+  protected[diplomacy] def reverse = inner.reverse
   protected[diplomacy] def outputs = oPorts.map(_._2) zip edgesOut.map(e => outer.labelO(e))
   protected[diplomacy] def inputs  = iPorts.map(_._2) zip edgesIn .map(e => inner.labelI(e))
 }

src/main/scala/uncore/tilelink2/IntNodes.scala

@@ -70,6 +70,7 @@ object IntImp extends NodeImp[IntSourcePortParameters, IntSinkPortParameters, In
   def bundleI(ei: IntEdge): Vec[Bool] = Vec(ei.source.num, Bool())
 
   def colour = "#0000ff" // blue
+  override def reverse = true
   override def labelI(ei: IntEdge) = ei.source.sources.map(_.range.size).sum.toString
   override def labelO(eo: IntEdge) = eo.source.sources.map(_.range.size).sum.toString