Unhandled exception with incompletely specified hierarchical networks

[mayyxeng]

namespace hetero.stencil.denoise2d:

actor Filter(uint lower_bound, uint upper_bound, int max_index) int In ==> int Out:

    uint index := 0;
    drop: action In:[t] ==> 
    guard index < lower_bound and index > upper_bound
    do
      if index = max_index - 1 then
        index := 0;
      else
        index := index + 1;
      end
    end

    pass: action In:[t] ==> Out:[t]
    guard index >= lower_bound and index <= upper_bound 
    do 
      index := index + 1;
    end

  end

  actor Splitter() int In ==> int Left, int Right:
    split: action In:[t] ==> Left:[t], Right:[t] end
  end
  actor Denoise2DKernel() 
    int Ref_1_0, 
    int Ref_0_1, 
    int Ref_0_0, 
    int Ref_0_m1, 
    int Ref_m1_0 
    ==> int Out:

    kernel:action 
      Ref_1_0:[t10], 
      Ref_0_1:[t01], 
      Ref_0_0:[t00], 
      Ref_0_m1:[t0m1], 
      Ref_m1_0:[tm10] ==>
      Out:[(t00 - t0m1) * (t00 - t0m1) + 
           (t00 - t01 ) * (t00 - t01 ) + 
           (t00 - tm10) * (t00 - tm10) + 
           (t00 - t10 ) * (t00 - t10 )] 
    end
  end

  network Denoise2D(uint x_dim, uint y_dim) int In ==> int Out:

    entities

      f0 = Filter(
        max_index = x_dim * y_dim, 
        lower_bound = 2 * y_dim + 1, 
        upper_bound = (x_dim - 1) * y_dim + (y_dim - 2));
      f1 = Filter(
        max_index = x_dim * y_dim,
        lower_bound = 1 * y_dim + 2,
        upper_bound = (x_dim - 2) * y_dim + (y_dim - 1)
      );
      f2 = Filter(
        max_index = x_dim * y_dim,
        lower_bound = 1 * y_dim + 1,
        upper_bound = (x_dim - 2) * y_dim + (y_dim - 2)
      );
      f3 = Filter(
        max_index = x_dim * y_dim,
        lower_bound = 1 * y_dim + 0,
        upper_bound = (x_dim - 2) * y_dim + (y_dim - 3)
      );
      f4 = Filter(
        max_index = x_dim * y_dim,
        lower_bound = 0 * y_dim + 1,
        upper_bound = (x_dim - 3) * y_dim + (y_dim - 2)
      );
      
      s0 = Splitter(); s1 = Splitter(); s2 = Splitter(); s3 = Splitter();
      kernel = Denoise2DKernel();

    structure
    
      In --> s0.In;
      s0.Left --> f0.In;
      s0.Right --> s1.In;
      s1.Left --> f1.In;
      s1.Right --> s2.In;
      s2.Left --> f2.In;
      s2.Right --> s3.In;
      s3.Left --> f3.In;
      s3.Right --> f4.In;
      f0.Out --> kernel.Ref_1_0;
      f1.Out --> kernel.Ref_0_1;
      f2.Out --> kernel.Ref_0_0;
      f3.Out --> kernel.Ref_0_m1;
      f4.Out --> kernel.Ref_m1_0;
      **// kernel.Out --> Out; this connection is left out on purpose.**

  end

  network Denoise2D_5x5() int In ==> int Out:
    entities
      stencil_network = Denoise2D(x_dim = 5, y_dim = 5);
    structure

      In --> stencil_network.In;
      stencil_network.Out --> Out;
  end

end

Compiled with

streamblocks vivado-hls --source-path ${CA_SOURCE_PATH}  --target-path ${TARGET_PATH} hetero.stencil.denoise2d.Denoise2D_5x5

Yields

Exception in thread "main" java.util.NoSuchElementException: The node is not part of this tree.
        at se.lth.cs.tycho.phase.TreeShadowImpl.parent(TreeShadowImpl.java:31)
        at se.lth.cs.tycho.attribute.GlobalNames$Implementation.globalName(GlobalNames.java:55)
        at se.lth.cs.tycho.attribute.GlobalNames$Implementation$MultiJ.globalName(GlobalNames$Implementation$MultiJ.java:100)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:50)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:78)
        at se.lth.cs.tycho.ir.IRNode$Transformation.applyChecked(IRNode.java:147)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.applyChecked(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:89)
        at se.lth.cs.tycho.ir.entity.nl.EntityInstanceExpr.transformChildren(EntityInstanceExpr.java:87)
        at se.lth.cs.tycho.ir.entity.nl.EntityInstanceExpr.transformChildren(EntityInstanceExpr.java:21)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:45)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:80)
        at se.lth.cs.tycho.ir.IRNode$Transformation.applyChecked(IRNode.java:147)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.applyChecked(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:89)
        at se.lth.cs.tycho.ir.entity.nl.InstanceDecl.transformChildren(InstanceDecl.java:53)
        at se.lth.cs.tycho.ir.entity.nl.InstanceDecl.transformChildren(InstanceDecl.java:8)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:45)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:80)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:2)
        at se.lth.cs.tycho.ir.util.ImmutableList.map(ImmutableList.java:35)
        at se.lth.cs.tycho.ir.entity.nl.NlNetwork.transformChildren(NlNetwork.java:73)
        at se.lth.cs.tycho.ir.entity.nl.NlNetwork.transformChildren(NlNetwork.java:17)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:45)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:80)
        at se.lth.cs.tycho.ir.decl.GlobalEntityDecl.transformChildren(GlobalEntityDecl.java:54)
        at se.lth.cs.tycho.ir.decl.GlobalEntityDecl.transformChildren(GlobalEntityDecl.java:8)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:45)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:80)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:2)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
        at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at se.lth.cs.tycho.ir.IRNode$Transformation.mapChecked(IRNode.java:162)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.mapChecked(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:69)
        at se.lth.cs.tycho.ir.NamespaceDecl.transformChildren(NamespaceDecl.java:115)
        at se.lth.cs.tycho.ir.NamespaceDecl.transformChildren(NamespaceDecl.java:11)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:45)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:80)
        at se.lth.cs.tycho.compiler.SourceUnit.transformChildren(SourceUnit.java:29)
        at se.lth.cs.tycho.compiler.SourceUnit.transformChildren(SourceUnit.java:10)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation.apply(ResolveGlobalEntityNamesPhase.java:45)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:80)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.apply(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:2)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
        at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
        at se.lth.cs.tycho.ir.IRNode$Transformation.mapChecked(IRNode.java:162)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase$Transformation$MultiJ.mapChecked(ResolveGlobalEntityNamesPhase$Transformation$MultiJ.java:69)
        at se.lth.cs.tycho.compiler.CompilationTask.transformChildren(CompilationTask.java:98)
        at se.lth.cs.tycho.phase.ResolveGlobalEntityNamesPhase.execute(ResolveGlobalEntityNamesPhase.java:32)
        at se.lth.cs.tycho.compiler.Compiler.compile(Compiler.java:279)
        at se.lth.cs.tycho.compiler.Main.run(Main.java:140)
        at se.lth.cs.tycho.compiler.Main.main(Main.java:23)

Instead of throwing an error.