https://www.graalvm.org/ 
public class com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger extends com.oracle.truffle.api.instrumentation.TruffleInstrument
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger
  super_class: com.oracle.truffle.api.instrumentation.TruffleInstrument
{
  static final java.lang.String ID;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "instrument-that-needs-debugger"

  static boolean haveDebugger;
    descriptor: Z
    flags: (0x0008) ACC_STATIC

  private final org.graalvm.options.OptionKey<java.lang.String> debuggerKey;
    descriptor: Lorg/graalvm/options/OptionKey;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Lorg/graalvm/options/OptionKey<Ljava/lang/String;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger this
         0: .line 160
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.instrumentation.TruffleInstrument.<init>:()V
         1: .line 165
            aload 0 /* this */
            new org.graalvm.options.OptionKey
            dup
            ldc ""
            invokespecial org.graalvm.options.OptionKey.<init>:(Ljava/lang/Object;)V
            putfield com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger.debuggerKey:Lorg/graalvm/options/OptionKey;
         2: .line 160
            return
        end local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/api/debug/test/DebuggerRetrievalTest$InstrumentThatNeedsDebugger;

  protected void onCreate(com.oracle.truffle.api.instrumentation.TruffleInstrument$Env);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger this
        start local 1 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env env
         0: .line 169
            aload 1 /* env */
            aload 1 /* env */
            invokevirtual com.oracle.truffle.api.instrumentation.TruffleInstrument$Env.getInstruments:()Ljava/util/Map;
            ldc "debugger"
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.InstrumentInfo
            ldc Lcom/oracle/truffle/api/debug/Debugger;
            invokevirtual com.oracle.truffle.api.instrumentation.TruffleInstrument$Env.lookup:(Lcom/oracle/truffle/api/InstrumentInfo;Ljava/lang/Class;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.debug.Debugger
            astore 2 /* debugger */
        start local 2 // com.oracle.truffle.api.debug.Debugger debugger
         1: .line 170
            aload 2 /* debugger */
            ifnull 2
            iconst_1
            goto 3
      StackMap locals: com.oracle.truffle.api.debug.Debugger
      StackMap stack:
         2: iconst_0
      StackMap locals:
      StackMap stack: int
         3: putstatic com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger.haveDebugger:Z
         4: .line 171
            return
        end local 2 // com.oracle.truffle.api.debug.Debugger debugger
        end local 1 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env env
        end local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Lcom/oracle/truffle/api/debug/test/DebuggerRetrievalTest$InstrumentThatNeedsDebugger;
            0    5     1       env  Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env;
            1    5     2  debugger  Lcom/oracle/truffle/api/debug/Debugger;
    MethodParameters:
      Name  Flags
      env   

  protected org.graalvm.options.OptionDescriptors getOptionDescriptors();
    descriptor: ()Lorg/graalvm/options/OptionDescriptors;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger this
         0: .line 175
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger.debuggerKey:Lorg/graalvm/options/OptionKey;
            ldc "instrument-that-needs-debugger.dbg"
            invokestatic org.graalvm.options.OptionDescriptor.newBuilder:(Lorg/graalvm/options/OptionKey;Ljava/lang/String;)Lorg/graalvm/options/OptionDescriptor$Builder;
            invokevirtual org.graalvm.options.OptionDescriptor$Builder.build:()Lorg/graalvm/options/OptionDescriptor;
            invokestatic java.util.Collections.singletonList:(Ljava/lang/Object;)Ljava/util/List;
            invokestatic org.graalvm.options.OptionDescriptors.create:(Ljava/util/List;)Lorg/graalvm/options/OptionDescriptors;
            areturn
        end local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/DebuggerRetrievalTest$InstrumentThatNeedsDebugger;
}
SourceFile: "DebuggerRetrievalTest.java"
NestHost: com.oracle.truffle.api.debug.test.DebuggerRetrievalTest
InnerClasses:
  public InstrumentThatNeedsDebugger = com.oracle.truffle.api.debug.test.DebuggerRetrievalTest$InstrumentThatNeedsDebugger of com.oracle.truffle.api.debug.test.DebuggerRetrievalTest
  public final Env = com.oracle.truffle.api.instrumentation.TruffleInstrument$Env of com.oracle.truffle.api.instrumentation.TruffleInstrument
  public abstract Registration = com.oracle.truffle.api.instrumentation.TruffleInstrument$Registration of com.oracle.truffle.api.instrumentation.TruffleInstrument
  public final Builder = org.graalvm.options.OptionDescriptor$Builder of org.graalvm.options.OptionDescriptor
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.instrumentation.TruffleInstrument$Registration(id = "instrument-that-needs-debugger", name = "Instrument That Needs Debugger")