https://www.graalvm.org/ 
public class com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage extends com.oracle.truffle.api.TruffleLanguage<com.oracle.truffle.api.debug.test.Context>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
  super_class: com.oracle.truffle.api.TruffleLanguage
{
  public static final java.lang.String ID;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "instrumentable-positions-test-language"

  static final org.graalvm.options.OptionKey<java.lang.Integer> PreMaterialize;
    descriptor: Lorg/graalvm/options/OptionKey;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    Signature: Lorg/graalvm/options/OptionKey<Ljava/lang/Integer;>;
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.Option(help = "Preform pre-materialization of AST nodes. (default:0, 1 - materialize in head recursion order, 2 - materialize in tail recursion order)", category = org.graalvm.options.OptionCategory.EXPERT:Lorg/graalvm/options/OptionCategory;)

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 113
            new org.graalvm.options.OptionKey
            dup
            iconst_0
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            invokespecial org.graalvm.options.OptionKey.<init>:(Ljava/lang/Object;)V
            putstatic com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage.PreMaterialize:Lorg/graalvm/options/OptionKey;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
         0: .line 108
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.TruffleLanguage.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;

  protected org.graalvm.options.OptionDescriptors getOptionDescriptors();
    descriptor: ()Lorg/graalvm/options/OptionDescriptors;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
         0: .line 117
            new java.lang.Error
            dup
            ldc "Unresolved compilation problem: \n\tInstrumentablePositionsTestLanguageOptionDescriptors cannot be resolved to a type\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;

  protected com.oracle.truffle.api.debug.test.Context createContext(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/debug/test/Context;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
         0: .line 122
            new com.oracle.truffle.api.debug.test.Context
            dup
            aload 1 /* env */
            invokespecial com.oracle.truffle.api.debug.test.Context.<init>:(Lcom/oracle/truffle/api/TruffleLanguage$Env;)V
            areturn
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;
            0    1     1   env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
    MethodParameters:
      Name  Flags
      env   

  protected com.oracle.truffle.api.CallTarget parse(com.oracle.truffle.api.TruffleLanguage$ParsingRequest);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$ParsingRequest;)Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=4, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$ParsingRequest request
         0: .line 127
            aload 1 /* request */
            invokevirtual com.oracle.truffle.api.TruffleLanguage$ParsingRequest.getSource:()Lcom/oracle/truffle/api/source/Source;
            astore 2 /* code */
        start local 2 // com.oracle.truffle.api.source.Source code
         1: .line 129
            aload 0 /* this */
            aload 2 /* code */
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage.parse:(Lcom/oracle/truffle/api/source/Source;)Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
            astore 3 /* node */
        start local 3 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode node
         2: .line 130
            aload 3 /* node */
            checkcast com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$CallNode
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$CallNode.getTarget:()Lcom/oracle/truffle/api/CallTarget;
            areturn
        end local 3 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode node
        end local 2 // com.oracle.truffle.api.source.Source code
        end local 1 // com.oracle.truffle.api.TruffleLanguage$ParsingRequest request
        end local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;
            0    3     1  request  Lcom/oracle/truffle/api/TruffleLanguage$ParsingRequest;
            1    3     2     code  Lcom/oracle/truffle/api/source/Source;
            2    3     3     node  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      request  

  public com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode parse(com.oracle.truffle.api.source.Source);
    descriptor: (Lcom/oracle/truffle/api/source/Source;)Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
        start local 1 // com.oracle.truffle.api.source.Source code
         0: .line 134
            ldc Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;
            invokestatic com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage.getCurrentContext:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.debug.test.Context
            invokevirtual com.oracle.truffle.api.debug.test.Context.getPreMaterialization:()I
            istore 2 /* preMaterialization */
        start local 2 // int preMaterialization
         1: .line 135
            new com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$Parser
            dup
            aload 0 /* this */
            aload 1 /* code */
            iload 2 /* preMaterialization */
            invokespecial com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$Parser.<init>:(Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;Lcom/oracle/truffle/api/source/Source;I)V
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$Parser.parse:()Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
            areturn
        end local 2 // int preMaterialization
        end local 1 // com.oracle.truffle.api.source.Source code
        end local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    2     0                this  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage;
            0    2     1                code  Lcom/oracle/truffle/api/source/Source;
            1    2     2  preMaterialization  I
    MethodParameters:
      Name  Flags
      code  

  private static com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode[] resolveChildren(com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor, boolean);
    descriptor: (Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$NodeDescriptor;Z)[Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=2, locals=6, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor nodeDescriptor
        start local 1 // boolean recursively
         0: .line 489
            aload 0 /* nodeDescriptor */
            getfield com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor.children:Ljava/util/List;
            ifnonnull 2
         1: .line 490
            iconst_0
            anewarray com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode
            areturn
         2: .line 492
      StackMap locals:
      StackMap stack:
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 2 /* chList */
        start local 2 // java.util.List chList
         3: .line 493
            aload 0 /* nodeDescriptor */
            getfield com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor.children:Ljava/util/List;
            invokeinterface java.util.List.iterator:()Ljava/util/Iterator;
            astore 4
            goto 9
      StackMap locals: com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor int java.util.List top java.util.Iterator
      StackMap stack:
         4: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor
            astore 3 /* nd */
        start local 3 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor nd
         5: .line 494
            aload 3 /* nd */
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor.getNode:()Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
            astore 5 /* ch */
        start local 5 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode ch
         6: .line 495
            aload 2 /* chList */
            aload 5 /* ch */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         7: .line 496
            iload 1 /* recursively */
            ifeq 9
            aload 5 /* ch */
            instanceof com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode
            ifeq 9
            aload 5 /* ch */
            checkcast com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode.isInstrumentable:()Z
            ifne 9
         8: .line 497
            aload 5 /* ch */
            checkcast com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode
            iload 1 /* recursively */
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode.assureChildrenResolved:(Z)V
        end local 5 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode ch
        end local 3 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor nd
         9: .line 493
      StackMap locals:
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 4
        10: .line 500
            aload 2 /* chList */
            aload 2 /* chList */
            invokeinterface java.util.List.size:()I
            anewarray com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode
            invokeinterface java.util.List.toArray:([Ljava/lang/Object;)[Ljava/lang/Object;
            checkcast com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode[]
            areturn
        end local 2 // java.util.List chList
        end local 1 // boolean recursively
        end local 0 // com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor nodeDescriptor
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0   11     0  nodeDescriptor  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$NodeDescriptor;
            0   11     1     recursively  Z
            3   11     2          chList  Ljava/util/List<Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;>;
            5    9     3              nd  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$NodeDescriptor;
            6    9     5              ch  Lcom/oracle/truffle/api/debug/test/InstrumentablePositionsTestLanguage$TestNode;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
                Name  Flags
      nodeDescriptor  
      recursively     

  protected java.lang.Object createContext(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Ljava/lang/Object;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokevirtual com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage.createContext:(Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/debug/test/Context;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lcom/oracle/truffle/api/TruffleLanguage<Lcom/oracle/truffle/api/debug/test/Context;>;
SourceFile: "InstrumentablePositionsTestLanguage.java"
NestMembers:
  com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode  com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$CallNode  com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor  com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$Parser  com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode  com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestRootNode
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage
  public final ParsingRequest = com.oracle.truffle.api.TruffleLanguage$ParsingRequest of com.oracle.truffle.api.TruffleLanguage
  public abstract Registration = com.oracle.truffle.api.TruffleLanguage$Registration of com.oracle.truffle.api.TruffleLanguage
  BaseNode = com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$BaseNode of com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
  private final CallNode = com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$CallNode of com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
  private final NodeDescriptor = com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$NodeDescriptor of com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
  private final Parser = com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$Parser of com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
  private abstract TestNode = com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestNode of com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
  private final TestRootNode = com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage$TestRootNode of com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.TruffleLanguage$Registration(id = "instrumentable-positions-test-language", name = "", version = "1.0")
      com.oracle.truffle.api.instrumentation.ProvidedTags(value = {Lcom/oracle/truffle/api/instrumentation/StandardTags$CallTag;, Lcom/oracle/truffle/api/instrumentation/StandardTags$ExpressionTag;, Lcom/oracle/truffle/api/instrumentation/StandardTags$RootTag;, Lcom/oracle/truffle/api/instrumentation/StandardTags$StatementTag;})