https://www.graalvm.org/ 
public final class org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList extends org.graalvm.compiler.graph.NodeWorkList
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList
  super_class: org.graalvm.compiler.graph.NodeWorkList
{
  protected final org.graalvm.compiler.graph.NodeBitMap visited;
    descriptor: Lorg/graalvm/compiler/graph/NodeBitMap;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL

  public void <init>(org.graalvm.compiler.graph.Graph);
    descriptor: (Lorg/graalvm/compiler/graph/Graph;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
        start local 1 // org.graalvm.compiler.graph.Graph graph
         0: .line 202
            aload 0 /* this */
            aload 1 /* graph */
            iconst_0
            invokespecial org.graalvm.compiler.graph.NodeWorkList.<init>:(Lorg/graalvm/compiler/graph/Graph;Z)V
         1: .line 203
            aload 0 /* this */
            aload 1 /* graph */
            invokevirtual org.graalvm.compiler.graph.Graph.createNodeBitMap:()Lorg/graalvm/compiler/graph/NodeBitMap;
            putfield org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList.visited:Lorg/graalvm/compiler/graph/NodeBitMap;
         2: .line 204
            return
        end local 1 // org.graalvm.compiler.graph.Graph graph
        end local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lorg/graalvm/compiler/graph/NodeWorkList$SingletonNodeWorkList;
            0    3     1  graph  Lorg/graalvm/compiler/graph/Graph;
    MethodParameters:
       Name  Flags
      graph  

  public void add(org.graalvm.compiler.graph.Node);
    descriptor: (Lorg/graalvm/compiler/graph/Node;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
        start local 1 // org.graalvm.compiler.graph.Node node
         0: .line 208
            aload 1 /* node */
            ifnull 4
         1: .line 209
            aload 0 /* this */
            getfield org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList.visited:Lorg/graalvm/compiler/graph/NodeBitMap;
            aload 1 /* node */
            invokevirtual org.graalvm.compiler.graph.NodeBitMap.isMarkedAndGrow:(Lorg/graalvm/compiler/graph/Node;)Z
            ifne 4
         2: .line 210
            aload 0 /* this */
            getfield org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList.visited:Lorg/graalvm/compiler/graph/NodeBitMap;
            aload 1 /* node */
            invokevirtual org.graalvm.compiler.graph.NodeBitMap.mark:(Lorg/graalvm/compiler/graph/Node;)V
         3: .line 211
            aload 0 /* this */
            getfield org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList.worklist:Ljava/util/Queue;
            aload 1 /* node */
            invokeinterface java.util.Queue.add:(Ljava/lang/Object;)Z
            pop
         4: .line 214
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.graalvm.compiler.graph.Node node
        end local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/graalvm/compiler/graph/NodeWorkList$SingletonNodeWorkList;
            0    5     1  node  Lorg/graalvm/compiler/graph/Node;
    MethodParameters:
      Name  Flags
      node  

  public boolean contains(org.graalvm.compiler.graph.Node);
    descriptor: (Lorg/graalvm/compiler/graph/Node;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
        start local 1 // org.graalvm.compiler.graph.Node node
         0: .line 218
            aload 0 /* this */
            getfield org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList.visited:Lorg/graalvm/compiler/graph/NodeBitMap;
            aload 1 /* node */
            invokevirtual org.graalvm.compiler.graph.NodeBitMap.isMarked:(Lorg/graalvm/compiler/graph/Node;)Z
            ireturn
        end local 1 // org.graalvm.compiler.graph.Node node
        end local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/graph/NodeWorkList$SingletonNodeWorkList;
            0    1     1  node  Lorg/graalvm/compiler/graph/Node;
    MethodParameters:
      Name  Flags
      node  

  public java.util.Iterator<org.graalvm.compiler.graph.Node> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
         0: .line 223
            new org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList$1
            dup
            aload 0 /* this */
            aload 0 /* this */
            invokespecial org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList$1.<init>:(Lorg/graalvm/compiler/graph/NodeWorkList$SingletonNodeWorkList;Lorg/graalvm/compiler/graph/NodeWorkList;)V
            areturn
        end local 0 // org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/graph/NodeWorkList$SingletonNodeWorkList;
    Signature: ()Ljava/util/Iterator<Lorg/graalvm/compiler/graph/Node;>;
}
SourceFile: "NodeWorkList.java"
NestHost: org.graalvm.compiler.graph.NodeWorkList
InnerClasses:
  public final SingletonNodeWorkList = org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList of org.graalvm.compiler.graph.NodeWorkList
  org.graalvm.compiler.graph.NodeWorkList$SingletonNodeWorkList$1