https://www.graalvm.org/ 
class com.oracle.truffle.object.ShapeProfiler
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.object.ShapeProfiler
  super_class: java.lang.Object
{
  private static final java.lang.String LINE_SEPARATOR;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "***********************************************"

  private static final java.lang.String BULLET;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "* "

  private static final java.lang.String TOKEN_SEPARATOR;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "\t"

  private final java.util.concurrent.ConcurrentLinkedQueue<com.oracle.truffle.api.object.DynamicObject> queue;
    descriptor: Ljava/util/concurrent/ConcurrentLinkedQueue;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/concurrent/ConcurrentLinkedQueue<Lcom/oracle/truffle/api/object/DynamicObject;>;

  private static final com.oracle.truffle.object.ShapeProfiler shapeProf;
    descriptor: Lcom/oracle/truffle/object/ShapeProfiler;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 233
            getstatic com.oracle.truffle.object.ObjectStorageOptions.Profile:Z
            ifeq 4
         1: .line 234
            new com.oracle.truffle.object.ShapeProfiler
            dup
            invokespecial com.oracle.truffle.object.ShapeProfiler.<init>:()V
            putstatic com.oracle.truffle.object.ShapeProfiler.shapeProf:Lcom/oracle/truffle/object/ShapeProfiler;
         2: .line 235
            invokestatic java.lang.Runtime.getRuntime:()Ljava/lang/Runtime;
            new com.oracle.truffle.object.ShapeProfiler$1
            dup
            invokespecial com.oracle.truffle.object.ShapeProfiler$1.<init>:()V
            invokevirtual java.lang.Runtime.addShutdownHook:(Ljava/lang/Thread;)V
         3: .line 241
            goto 5
         4: .line 242
      StackMap locals:
      StackMap stack:
            aconst_null
            putstatic com.oracle.truffle.object.ShapeProfiler.shapeProf:Lcom/oracle/truffle/object/ShapeProfiler;
         5: .line 244
      StackMap locals:
      StackMap stack:
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.object.ShapeProfiler this
         0: .line 62
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 63
            aload 0 /* this */
            new java.util.concurrent.ConcurrentLinkedQueue
            dup
            invokespecial java.util.concurrent.ConcurrentLinkedQueue.<init>:()V
            putfield com.oracle.truffle.object.ShapeProfiler.queue:Ljava/util/concurrent/ConcurrentLinkedQueue;
         2: .line 64
            return
        end local 0 // com.oracle.truffle.object.ShapeProfiler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/object/ShapeProfiler;

  public void track(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.object.ShapeProfiler this
        start local 1 // com.oracle.truffle.api.object.DynamicObject obj
         0: .line 67
            aload 0 /* this */
            getfield com.oracle.truffle.object.ShapeProfiler.queue:Ljava/util/concurrent/ConcurrentLinkedQueue;
            aload 1 /* obj */
            invokevirtual java.util.concurrent.ConcurrentLinkedQueue.add:(Ljava/lang/Object;)Z
            pop
         1: .line 68
            return
        end local 1 // com.oracle.truffle.api.object.DynamicObject obj
        end local 0 // com.oracle.truffle.object.ShapeProfiler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/object/ShapeProfiler;
            0    2     1   obj  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
      Name  Flags
      obj   

  public void dump(java.io.PrintWriter);
    descriptor: (Ljava/io/PrintWriter;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=6, args_size=2
        start local 0 // com.oracle.truffle.object.ShapeProfiler this
        start local 1 // java.io.PrintWriter out
         0: .line 71
            new com.oracle.truffle.object.ShapeProfiler$ShapeStats
            dup
            ldc "Cumulative results for all shapes"
            invokespecial com.oracle.truffle.object.ShapeProfiler$ShapeStats.<init>:(Ljava/lang/String;)V
            astore 2 /* globalStats */
        start local 2 // com.oracle.truffle.object.ShapeProfiler$ShapeStats globalStats
         1: .line 72
            aload 0 /* this */
            getfield com.oracle.truffle.object.ShapeProfiler.queue:Ljava/util/concurrent/ConcurrentLinkedQueue;
            invokevirtual java.util.concurrent.ConcurrentLinkedQueue.iterator:()Ljava/util/Iterator;
            astore 4
            goto 5
      StackMap locals: com.oracle.truffle.object.ShapeProfiler java.io.PrintWriter com.oracle.truffle.object.ShapeProfiler$ShapeStats top java.util.Iterator
      StackMap stack:
         2: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast com.oracle.truffle.api.object.DynamicObject
            astore 3 /* obj */
        start local 3 // com.oracle.truffle.api.object.DynamicObject obj
         3: .line 73
            aload 3 /* obj */
            invokevirtual com.oracle.truffle.api.object.DynamicObject.getShape:()Lcom/oracle/truffle/api/object/Shape;
            astore 5 /* shape */
        start local 5 // com.oracle.truffle.api.object.Shape shape
         4: .line 74
            aload 2 /* globalStats */
            aload 5 /* shape */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.profile:(Lcom/oracle/truffle/api/object/Shape;)V
        end local 5 // com.oracle.truffle.api.object.Shape shape
        end local 3 // com.oracle.truffle.api.object.DynamicObject obj
         5: .line 72
      StackMap locals:
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 2
         6: .line 77
            aload 2 /* globalStats */
            aload 1 /* out */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.dump:(Ljava/io/PrintWriter;)V
         7: .line 78
            return
        end local 2 // com.oracle.truffle.object.ShapeProfiler$ShapeStats globalStats
        end local 1 // java.io.PrintWriter out
        end local 0 // com.oracle.truffle.object.ShapeProfiler this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    8     0         this  Lcom/oracle/truffle/object/ShapeProfiler;
            0    8     1          out  Ljava/io/PrintWriter;
            1    8     2  globalStats  Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;
            3    5     3          obj  Lcom/oracle/truffle/api/object/DynamicObject;
            4    5     5        shape  Lcom/oracle/truffle/api/object/Shape;
    MethodParameters:
      Name  Flags
      out   

  public void dump(java.io.PrintWriter, int);
    descriptor: (Ljava/io/PrintWriter;I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=9, args_size=3
        start local 0 // com.oracle.truffle.object.ShapeProfiler this
        start local 1 // java.io.PrintWriter out
        start local 2 // int topResults
         0: .line 81
            iload 2 /* topResults */
            ifle 23
         1: .line 82
            new java.util.IdentityHashMap
            dup
            invokespecial java.util.IdentityHashMap.<init>:()V
            astore 3 /* shapeMap */
        start local 3 // java.util.IdentityHashMap shapeMap
         2: .line 84
            aload 0 /* this */
            getfield com.oracle.truffle.object.ShapeProfiler.queue:Ljava/util/concurrent/ConcurrentLinkedQueue;
            invokevirtual java.util.concurrent.ConcurrentLinkedQueue.iterator:()Ljava/util/Iterator;
            astore 5
            goto 9
      StackMap locals: com.oracle.truffle.object.ShapeProfiler java.io.PrintWriter int java.util.IdentityHashMap top java.util.Iterator
      StackMap stack:
         3: aload 5
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast com.oracle.truffle.api.object.DynamicObject
            astore 4 /* obj */
        start local 4 // com.oracle.truffle.api.object.DynamicObject obj
         4: .line 85
            aload 4 /* obj */
            invokevirtual com.oracle.truffle.api.object.DynamicObject.getShape:()Lcom/oracle/truffle/api/object/Shape;
            astore 6 /* shape */
        start local 6 // com.oracle.truffle.api.object.Shape shape
         5: .line 86
            aload 3 /* shapeMap */
            aload 6 /* shape */
            invokevirtual java.util.IdentityHashMap.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.oracle.truffle.object.ShapeProfiler$ShapeStats
            astore 7 /* stats */
        start local 7 // com.oracle.truffle.object.ShapeProfiler$ShapeStats stats
         6: .line 87
            aload 7 /* stats */
            ifnonnull 8
         7: .line 88
            aload 3 /* shapeMap */
            aload 6 /* shape */
            new com.oracle.truffle.object.ShapeProfiler$ShapeStats
            dup
            aload 6 /* shape */
            invokestatic com.oracle.truffle.object.ShapeProfiler.createLabel:(Lcom/oracle/truffle/api/object/Shape;)Ljava/lang/String;
            invokespecial com.oracle.truffle.object.ShapeProfiler$ShapeStats.<init>:(Ljava/lang/String;)V
            dup
            astore 7 /* stats */
            invokevirtual java.util.IdentityHashMap.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         8: .line 90
      StackMap locals: com.oracle.truffle.object.ShapeProfiler java.io.PrintWriter int java.util.IdentityHashMap com.oracle.truffle.api.object.DynamicObject java.util.Iterator com.oracle.truffle.api.object.Shape com.oracle.truffle.object.ShapeProfiler$ShapeStats
      StackMap stack:
            aload 7 /* stats */
            aload 6 /* shape */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.profile:(Lcom/oracle/truffle/api/object/Shape;)V
        end local 7 // com.oracle.truffle.object.ShapeProfiler$ShapeStats stats
        end local 6 // com.oracle.truffle.api.object.Shape shape
        end local 4 // com.oracle.truffle.api.object.DynamicObject obj
         9: .line 84
      StackMap locals: com.oracle.truffle.object.ShapeProfiler java.io.PrintWriter int java.util.IdentityHashMap top java.util.Iterator
      StackMap stack:
            aload 5
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 3
        10: .line 93
            new java.util.ArrayList
            dup
            aload 3 /* shapeMap */
            invokevirtual java.util.IdentityHashMap.values:()Ljava/util/Collection;
            invokespecial java.util.ArrayList.<init>:(Ljava/util/Collection;)V
            astore 4 /* allStats */
        start local 4 // java.util.List allStats
        11: .line 94
            aload 4 /* allStats */
            new com.oracle.truffle.object.ShapeProfiler$2
            dup
            aload 0 /* this */
            invokespecial com.oracle.truffle.object.ShapeProfiler$2.<init>:(Lcom/oracle/truffle/object/ShapeProfiler;)V
            invokestatic java.util.Collections.sort:(Ljava/util/List;Ljava/util/Comparator;)V
        12: .line 100
            iload 2 /* topResults */
            aload 4 /* allStats */
            invokeinterface java.util.List.size:()I
            invokestatic java.lang.Math.min:(II)I
            istore 5 /* top */
        start local 5 // int top
        13: .line 101
            new com.oracle.truffle.object.ShapeProfiler$ShapeStats
            dup
            new java.lang.StringBuilder
            dup
            ldc "Cumulative results for top "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 5 /* top */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " shapes"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial com.oracle.truffle.object.ShapeProfiler$ShapeStats.<init>:(Ljava/lang/String;)V
            astore 6 /* avgStats */
        start local 6 // com.oracle.truffle.object.ShapeProfiler$ShapeStats avgStats
        14: .line 102
            iconst_0
            istore 7 /* i */
        start local 7 // int i
        15: goto 21
        16: .line 103
      StackMap locals: com.oracle.truffle.object.ShapeProfiler java.io.PrintWriter int java.util.IdentityHashMap java.util.List int com.oracle.truffle.object.ShapeProfiler$ShapeStats int
      StackMap stack:
            aload 4 /* allStats */
            iload 7 /* i */
            invokeinterface java.util.List.get:(I)Ljava/lang/Object;
            checkcast com.oracle.truffle.object.ShapeProfiler$ShapeStats
            astore 8 /* stats */
        start local 8 // com.oracle.truffle.object.ShapeProfiler$ShapeStats stats
        17: .line 104
            aload 8 /* stats */
            new java.lang.StringBuilder
            dup
            ldc "Shape "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 7 /* i */
            iconst_1
            iadd
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc ": "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 8 /* stats */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.getLabel:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.setLabel:(Ljava/lang/String;)V
        18: .line 105
            aload 8 /* stats */
            aload 1 /* out */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.dump:(Ljava/io/PrintWriter;)V
        19: .line 106
            aload 6 /* avgStats */
            aload 8 /* stats */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.add:(Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;)V
        end local 8 // com.oracle.truffle.object.ShapeProfiler$ShapeStats stats
        20: .line 102
            iinc 7 /* i */ 1
      StackMap locals:
      StackMap stack:
        21: iload 7 /* i */
            iload 5 /* top */
            if_icmplt 16
        end local 7 // int i
        22: .line 108
            aload 6 /* avgStats */
            aload 1 /* out */
            invokevirtual com.oracle.truffle.object.ShapeProfiler$ShapeStats.dump:(Ljava/io/PrintWriter;)V
        end local 6 // com.oracle.truffle.object.ShapeProfiler$ShapeStats avgStats
        end local 5 // int top
        end local 4 // java.util.List allStats
        end local 3 // java.util.IdentityHashMap shapeMap
        23: .line 111
      StackMap locals: com.oracle.truffle.object.ShapeProfiler java.io.PrintWriter int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* out */
            invokevirtual com.oracle.truffle.object.ShapeProfiler.dump:(Ljava/io/PrintWriter;)V
        24: .line 112
            return
        end local 2 // int topResults
        end local 1 // java.io.PrintWriter out
        end local 0 // com.oracle.truffle.object.ShapeProfiler this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   25     0        this  Lcom/oracle/truffle/object/ShapeProfiler;
            0   25     1         out  Ljava/io/PrintWriter;
            0   25     2  topResults  I
            2   23     3    shapeMap  Ljava/util/IdentityHashMap<Lcom/oracle/truffle/api/object/Shape;Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;>;
            4    9     4         obj  Lcom/oracle/truffle/api/object/DynamicObject;
            5    9     6       shape  Lcom/oracle/truffle/api/object/Shape;
            6    9     7       stats  Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;
           11   23     4    allStats  Ljava/util/List<Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;>;
           13   23     5         top  I
           14   23     6    avgStats  Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;
           15   22     7           i  I
           17   20     8       stats  Lcom/oracle/truffle/object/ShapeProfiler$ShapeStats;
    MethodParameters:
            Name  Flags
      out         
      topResults  

  private static java.lang.String createLabel(com.oracle.truffle.api.object.Shape);
    descriptor: (Lcom/oracle/truffle/api/object/Shape;)Ljava/lang/String;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // com.oracle.truffle.api.object.Shape shape
         0: .line 115
            aload 0 /* shape */
            invokevirtual java.lang.Object.toString:()Ljava/lang/String;
            astore 1 /* label */
        start local 1 // java.lang.String label
         1: .line 116
            aload 1 /* label */
            aload 1 /* label */
            bipush 123
            invokevirtual java.lang.String.indexOf:(I)I
            iconst_1
            iadd
            aload 1 /* label */
            bipush 125
            invokevirtual java.lang.String.lastIndexOf:(I)I
            invokevirtual java.lang.String.substring:(II)Ljava/lang/String;
            areturn
        end local 1 // java.lang.String label
        end local 0 // com.oracle.truffle.api.object.Shape shape
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    2     0  shape  Lcom/oracle/truffle/api/object/Shape;
            1    2     1  label  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      shape  

  public static com.oracle.truffle.object.ShapeProfiler getInstance();
    descriptor: ()Lcom/oracle/truffle/object/ShapeProfiler;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 227
            getstatic com.oracle.truffle.object.ShapeProfiler.shapeProf:Lcom/oracle/truffle/object/ShapeProfiler;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "ShapeProfiler.java"
NestMembers:
  com.oracle.truffle.object.ShapeProfiler$1  com.oracle.truffle.object.ShapeProfiler$2  com.oracle.truffle.object.ShapeProfiler$ShapeStats
InnerClasses:
  com.oracle.truffle.object.ShapeProfiler$1
  com.oracle.truffle.object.ShapeProfiler$2
  private ShapeStats = com.oracle.truffle.object.ShapeProfiler$ShapeStats of com.oracle.truffle.object.ShapeProfiler