https://www.graalvm.org/ 
class com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet extends com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$NodeBitSet
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet
  super_class: com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$NodeBitSet
{
  private final java.util.Set<com.oracle.truffle.dsl.processor.model.SpecializationData> relevantSpecializations;
    descriptor: Ljava/util/Set;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Set<Lcom/oracle/truffle/dsl/processor/model/SpecializationData;>;

  final com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory this$0;
    descriptor: Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory, java.lang.Object[], com.oracle.truffle.dsl.processor.model.SpecializationData[], boolean, int);
    descriptor: (Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory;[Ljava/lang/Object;[Lcom/oracle/truffle/dsl/processor/model/SpecializationData;ZI)V
    flags: (0x0000) 
    Code:
      stack=4, locals=6, args_size=6
        start local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
        start local 2 // java.lang.Object[] objects
        start local 3 // com.oracle.truffle.dsl.processor.model.SpecializationData[] relevantSpecializations
        start local 4 // boolean needsVolatile
        start local 5 // int index
         0: .line 5081
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet.this$0:Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory;
         1: .line 5082
            aload 0 /* this */
            new java.lang.StringBuilder
            dup
            ldc "state_"
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 5 /* index */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 2 /* objects */
            iload 4 /* needsVolatile */
            invokespecial com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$NodeBitSet.<init>:(Ljava/lang/String;[Ljava/lang/Object;Z)V
         2: .line 5083
            aload 0 /* this */
            new java.util.HashSet
            dup
            aload 3 /* relevantSpecializations */
            invokestatic java.util.Arrays.asList:([Ljava/lang/Object;)Ljava/util/List;
            invokespecial java.util.HashSet.<init>:(Ljava/util/Collection;)V
            putfield com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet.relevantSpecializations:Ljava/util/Set;
         3: .line 5084
            return
        end local 5 // int index
        end local 4 // boolean needsVolatile
        end local 3 // com.oracle.truffle.dsl.processor.model.SpecializationData[] relevantSpecializations
        end local 2 // java.lang.Object[] objects
        end local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
      LocalVariableTable:
        Start  End  Slot                     Name  Signature
            0    4     0                     this  Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory$StateBitSet;
            0    4     2                  objects  [Ljava/lang/Object;
            0    4     3  relevantSpecializations  [Lcom/oracle/truffle/dsl/processor/model/SpecializationData;
            0    4     4            needsVolatile  Z
            0    4     5                    index  I
    MethodParameters:
                         Name  Flags
      this$0                   final
      objects                  
      relevantSpecializations  
      needsVolatile            
      index                    

  protected int calculateRequiredBits(java.lang.Object);
    descriptor: (Ljava/lang/Object;)I
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
        start local 1 // java.lang.Object object
         0: .line 5088
            aload 0 /* this */
            getfield com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet.this$0:Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory;
            getfield com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory.typeSystem:Lcom/oracle/truffle/dsl/processor/model/TypeSystemData;
            aload 1 /* object */
            invokestatic com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory.getRequiredStateBits:(Lcom/oracle/truffle/dsl/processor/model/TypeSystemData;Ljava/lang/Object;)I
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory$StateBitSet;
            0    1     1  object  Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      object  

  boolean isRelevantForSpecialization(com.oracle.truffle.dsl.processor.model.SpecializationData);
    descriptor: (Lcom/oracle/truffle/dsl/processor/model/SpecializationData;)Z
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
        start local 1 // com.oracle.truffle.dsl.processor.model.SpecializationData specialization
         0: .line 5096
            aload 0 /* this */
            getfield com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet.relevantSpecializations:Ljava/util/Set;
            aload 1 /* specialization */
            invokeinterface java.util.Set.contains:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // com.oracle.truffle.dsl.processor.model.SpecializationData specialization
        end local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    1     0            this  Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory$StateBitSet;
            0    1     1  specialization  Lcom/oracle/truffle/dsl/processor/model/SpecializationData;
    MethodParameters:
                Name  Flags
      specialization  

  boolean containsSpecialization();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=2, locals=5, args_size=1
        start local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
         0: .line 5100
            aload 0 /* this */
            invokevirtual com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet.getObjects:()[Ljava/lang/Object;
            dup
            astore 4
            arraylength
            istore 3
            iconst_0
            istore 2
            goto 5
      StackMap locals: com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet top int int java.lang.Object[]
      StackMap stack:
         1: aload 4
            iload 2
            aaload
            astore 1 /* o */
        start local 1 // java.lang.Object o
         2: .line 5101
            aload 1 /* o */
            instanceof com.oracle.truffle.dsl.processor.model.SpecializationData
            ifeq 4
         3: .line 5102
            iconst_1
            ireturn
        end local 1 // java.lang.Object o
         4: .line 5100
      StackMap locals:
      StackMap stack:
            iinc 2 1
      StackMap locals:
      StackMap stack:
         5: iload 2
            iload 3
            if_icmplt 1
         6: .line 5105
            iconst_0
            ireturn
        end local 0 // com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lcom/oracle/truffle/dsl/processor/generator/FlatNodeGenFactory$StateBitSet;
            2    4     1     o  Ljava/lang/Object;
}
SourceFile: "FlatNodeGenFactory.java"
NestHost: com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory
InnerClasses:
  private abstract NodeBitSet = com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$NodeBitSet of com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory
  private StateBitSet = com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory$StateBitSet of com.oracle.truffle.dsl.processor.generator.FlatNodeGenFactory