https://www.graalvm.org/ 
class com.oracle.truffle.polyglot.PolyglotManagement$1 implements com.oracle.truffle.api.instrumentation.SourceSectionFilter$SourcePredicate
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.polyglot.PolyglotManagement$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.polyglot.PolyglotManagement this$0;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotManagement;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final com.oracle.truffle.polyglot.PolyglotEngineImpl val$engine;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotEngineImpl;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final java.util.function.Predicate val$sourceFilter;
    descriptor: Ljava/util/function/Predicate;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final com.oracle.truffle.polyglot.PolyglotManagement$ListenerImpl val$config;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotManagement$ListenerImpl;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.polyglot.PolyglotManagement, com.oracle.truffle.polyglot.PolyglotEngineImpl, java.util.function.Predicate, com.oracle.truffle.polyglot.PolyglotManagement$ListenerImpl);
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotManagement;Lcom/oracle/truffle/polyglot/PolyglotEngineImpl;Ljava/util/function/Predicate;Lcom/oracle/truffle/polyglot/PolyglotManagement$ListenerImpl;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=5, args_size=5
        start local 0 // com.oracle.truffle.polyglot.PolyglotManagement$1 this
         0: .line 115
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.polyglot.PolyglotManagement$1.this$0:Lcom/oracle/truffle/polyglot/PolyglotManagement;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$engine:Lcom/oracle/truffle/polyglot/PolyglotEngineImpl;
            aload 0 /* this */
            aload 3
            putfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$sourceFilter:Ljava/util/function/Predicate;
            aload 0 /* this */
            aload 4
            putfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$config:Lcom/oracle/truffle/polyglot/PolyglotManagement$ListenerImpl;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.polyglot.PolyglotManagement$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotManagement$1;
    MethodParameters:
                  Name  Flags
      this$0            final
      val$engine        final
      val$sourceFilter  final
      val$config        final

  public boolean test(com.oracle.truffle.api.source.Source);
    descriptor: (Lcom/oracle/truffle/api/source/Source;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotManagement$1 this
        start local 1 // com.oracle.truffle.api.source.Source s
         0: .line 117
            aload 1 /* s */
            invokevirtual com.oracle.truffle.api.source.Source.getLanguage:()Ljava/lang/String;
            astore 2 /* language */
        start local 2 // java.lang.String language
         1: .line 118
            aload 2 /* language */
            ifnonnull 3
         2: .line 119
            iconst_0
            ireturn
         3: .line 120
      StackMap locals: java.lang.String
      StackMap stack:
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$engine:Lcom/oracle/truffle/polyglot/PolyglotEngineImpl;
            getfield com.oracle.truffle.polyglot.PolyglotEngineImpl.idToLanguage:Ljava/util/Map;
            aload 2 /* language */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifne 5
         4: .line 121
            iconst_0
            ireturn
         5: .line 122
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$sourceFilter:Ljava/util/function/Predicate;
            ifnull 12
         6: .line 124
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$sourceFilter:Ljava/util/function/Predicate;
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotManagement$1.this$0:Lcom/oracle/truffle/polyglot/PolyglotManagement;
            getfield com.oracle.truffle.polyglot.PolyglotManagement.engineImpl:Lcom/oracle/truffle/polyglot/PolyglotImpl;
            aload 1 /* s */
            invokevirtual com.oracle.truffle.polyglot.PolyglotImpl.getOrCreatePolyglotSource:(Lcom/oracle/truffle/api/source/Source;)Lorg/graalvm/polyglot/Source;
            invokeinterface java.util.function.Predicate.test:(Ljava/lang/Object;)Z
         7: ireturn
         8: .line 125
      StackMap locals:
      StackMap stack: java.lang.Throwable
            astore 3 /* e */
        start local 3 // java.lang.Throwable e
         9: .line 126
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotManagement$1.val$config:Lcom/oracle/truffle/polyglot/PolyglotManagement$ListenerImpl;
            getfield com.oracle.truffle.polyglot.PolyglotManagement$ListenerImpl.closing:Z
            ifeq 11
        10: .line 128
            iconst_0
            ireturn
        11: .line 130
      StackMap locals: java.lang.Throwable
      StackMap stack:
            new com.oracle.truffle.polyglot.HostException
            dup
            aload 3 /* e */
            invokespecial com.oracle.truffle.polyglot.HostException.<init>:(Ljava/lang/Throwable;)V
            athrow
        end local 3 // java.lang.Throwable e
        12: .line 133
      StackMap locals:
      StackMap stack:
            iconst_1
            ireturn
        end local 2 // java.lang.String language
        end local 1 // com.oracle.truffle.api.source.Source s
        end local 0 // com.oracle.truffle.polyglot.PolyglotManagement$1 this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0   13     0      this  Lcom/oracle/truffle/polyglot/PolyglotManagement$1;
            0   13     1         s  Lcom/oracle/truffle/api/source/Source;
            1   13     2  language  Ljava/lang/String;
            9   12     3         e  Ljava/lang/Throwable;
      Exception table:
        from    to  target  type
           6     7       8  Class java.lang.Throwable
    MethodParameters:
      Name  Flags
      s     

  public boolean test(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast com.oracle.truffle.api.source.Source
            invokevirtual com.oracle.truffle.polyglot.PolyglotManagement$1.test:(Lcom/oracle/truffle/api/source/Source;)Z
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "PolyglotManagement.java"
EnclosingMethod: com.oracle.truffle.polyglot.PolyglotManagement.attachExecutionListener:(Lorg/graalvm/polyglot/Engine;Ljava/util/function/Consumer;Ljava/util/function/Consumer;ZZZLjava/util/function/Predicate;Ljava/util/function/Predicate;ZZZ)Ljava/lang/Object;
NestHost: com.oracle.truffle.polyglot.PolyglotManagement
InnerClasses:
  public abstract SourcePredicate = com.oracle.truffle.api.instrumentation.SourceSectionFilter$SourcePredicate of com.oracle.truffle.api.instrumentation.SourceSectionFilter
  com.oracle.truffle.polyglot.PolyglotManagement$1
  ListenerImpl = com.oracle.truffle.polyglot.PolyglotManagement$ListenerImpl of com.oracle.truffle.polyglot.PolyglotManagement