https://www.graalvm.org/ 
public abstract class com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption
  super_class: com.oracle.truffle.api.nodes.Node
{
  protected com.oracle.truffle.api.Assumption assumption;
    descriptor: Lcom/oracle/truffle/api/Assumption;
    flags: (0x0004) ACC_PROTECTED

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
         0: .line 487
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
         1: .line 489
            aload 0 /* this */
            invokestatic com.oracle.truffle.api.Truffle.getRuntime:()Lcom/oracle/truffle/api/TruffleRuntime;
            invokeinterface com.oracle.truffle.api.TruffleRuntime.createAssumption:()Lcom/oracle/truffle/api/Assumption;
            putfield com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption.assumption:Lcom/oracle/truffle/api/Assumption;
         2: .line 487
            return
        end local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/api/dsl/test/FallbackTest$FallbackWithAssumption;

  public abstract java.lang.String execute(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      n     

  protected java.lang.String s0(int);
    descriptor: (I)Ljava/lang/String;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
        start local 1 // int n
         0: .line 495
            ldc "s0"
            areturn
        end local 1 // int n
        end local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/FallbackTest$FallbackWithAssumption;
            0    1     1     n  I
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(assumptions = {"getAssumption()"})
    MethodParameters:
      Name  Flags
      n     

  protected java.lang.String f0(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/String;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
        start local 1 // java.lang.Object n
         0: .line 500
            ldc "f0"
            areturn
        end local 1 // java.lang.Object n
        end local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/FallbackTest$FallbackWithAssumption;
            0    1     1     n  Ljava/lang/Object;
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.Fallback()
    MethodParameters:
      Name  Flags
      n     

  protected com.oracle.truffle.api.Assumption getAssumption();
    descriptor: ()Lcom/oracle/truffle/api/Assumption;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
         0: .line 504
            aload 0 /* this */
            getfield com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption.assumption:Lcom/oracle/truffle/api/Assumption;
            areturn
        end local 0 // com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/FallbackTest$FallbackWithAssumption;
}
SourceFile: "FallbackTest.java"
NestHost: com.oracle.truffle.api.dsl.test.FallbackTest
InnerClasses:
  public abstract FallbackWithAssumption = com.oracle.truffle.api.dsl.test.FallbackTest$FallbackWithAssumption of com.oracle.truffle.api.dsl.test.FallbackTest
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.TypeSystemReference(value = Lcom/oracle/truffle/api/dsl/test/examples/ExampleTypes;)
      com.oracle.truffle.api.dsl.Introspectable()