https://www.graalvm.org/ 
class com.oracle.truffle.object.Debug$IGVShapeVisitor implements com.oracle.truffle.object.Debug$DebugShapeVisitor<com.oracle.truffle.object.Debug$IGVShapeVisitor>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.object.Debug$IGVShapeVisitor
  super_class: java.lang.Object
{
  private final com.oracle.truffle.api.nodes.GraphPrintVisitor graphPrinter;
    descriptor: Lcom/oracle/truffle/api/nodes/GraphPrintVisitor;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 203
            ldc Lcom/oracle/truffle/object/Debug;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic com.oracle.truffle.object.Debug$IGVShapeVisitor.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>(com.oracle.truffle.api.nodes.GraphPrintVisitor);
    descriptor: (Lcom/oracle/truffle/api/nodes/GraphPrintVisitor;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.object.Debug$IGVShapeVisitor this
        start local 1 // com.oracle.truffle.api.nodes.GraphPrintVisitor printer
         0: .line 206
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 207
            aload 0 /* this */
            aload 1 /* printer */
            putfield com.oracle.truffle.object.Debug$IGVShapeVisitor.graphPrinter:Lcom/oracle/truffle/api/nodes/GraphPrintVisitor;
         2: .line 208
            return
        end local 1 // com.oracle.truffle.api.nodes.GraphPrintVisitor printer
        end local 0 // com.oracle.truffle.object.Debug$IGVShapeVisitor this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;
            0    3     1  printer  Lcom/oracle/truffle/api/nodes/GraphPrintVisitor;
    MethodParameters:
         Name  Flags
      printer  

  public com.oracle.truffle.object.Debug$IGVShapeVisitor visitShape(com.oracle.truffle.object.ShapeImpl, java.util.Map<? extends com.oracle.truffle.object.Transition, ? extends com.oracle.truffle.object.ShapeImpl>);
    descriptor: (Lcom/oracle/truffle/object/ShapeImpl;Ljava/util/Map;)Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=3, args_size=3
        start local 0 // com.oracle.truffle.object.Debug$IGVShapeVisitor this
        start local 1 // com.oracle.truffle.object.ShapeImpl shape
        start local 2 // java.util.Map transitions
         0: .line 212
            aload 0 /* this */
            getfield com.oracle.truffle.object.Debug$IGVShapeVisitor.graphPrinter:Lcom/oracle/truffle/api/nodes/GraphPrintVisitor;
            aload 1 /* shape */
            new com.oracle.truffle.object.Debug$IGVShapeVisitor$1
            dup
            aload 0 /* this */
            aload 2 /* transitions */
            invokespecial com.oracle.truffle.object.Debug$IGVShapeVisitor$1.<init>:(Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;Ljava/util/Map;)V
            invokevirtual com.oracle.truffle.api.nodes.GraphPrintVisitor.visit:(Ljava/lang/Object;Lcom/oracle/truffle/api/nodes/GraphPrintVisitor$GraphPrintHandler;)Lcom/oracle/truffle/api/nodes/GraphPrintVisitor;
            pop
         1: .line 244
            aload 0 /* this */
            areturn
        end local 2 // java.util.Map transitions
        end local 1 // com.oracle.truffle.object.ShapeImpl shape
        end local 0 // com.oracle.truffle.object.Debug$IGVShapeVisitor this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    2     0         this  Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;
            0    2     1        shape  Lcom/oracle/truffle/object/ShapeImpl;
            0    2     2  transitions  Ljava/util/Map<+Lcom/oracle/truffle/object/Transition;+Lcom/oracle/truffle/object/ShapeImpl;>;
    Signature: (Lcom/oracle/truffle/object/ShapeImpl;Ljava/util/Map<+Lcom/oracle/truffle/object/Transition;+Lcom/oracle/truffle/object/ShapeImpl;>;)Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;
    MethodParameters:
             Name  Flags
      shape        final
      transitions  final

  public java.lang.Object visitShape(com.oracle.truffle.object.ShapeImpl, java.util.Map);
    descriptor: (Lcom/oracle/truffle/object/ShapeImpl;Ljava/util/Map;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            aload 2
            invokevirtual com.oracle.truffle.object.Debug$IGVShapeVisitor.visitShape:(Lcom/oracle/truffle/object/ShapeImpl;Ljava/util/Map;)Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lcom/oracle/truffle/object/Debug$DebugShapeVisitor<Lcom/oracle/truffle/object/Debug$IGVShapeVisitor;>;
SourceFile: "Debug.java"
NestHost: com.oracle.truffle.object.Debug
InnerClasses:
  public abstract GraphPrintHandler = com.oracle.truffle.api.nodes.GraphPrintVisitor$GraphPrintHandler of com.oracle.truffle.api.nodes.GraphPrintVisitor
  abstract DebugShapeVisitor = com.oracle.truffle.object.Debug$DebugShapeVisitor of com.oracle.truffle.object.Debug
  IGVShapeVisitor = com.oracle.truffle.object.Debug$IGVShapeVisitor of com.oracle.truffle.object.Debug
  com.oracle.truffle.object.Debug$IGVShapeVisitor$1