https://www.graalvm.org/ 
final class com.oracle.truffle.nfi.NFILibrary implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.nfi.NFILibrary
  super_class: java.lang.Object
{
  private final java.lang.Object library;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.Map<java.lang.String, java.lang.Object> symbols;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;

  void <init>(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.Object library
         0: .line 68
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 69
            aload 0 /* this */
            aload 1 /* library */
            putfield com.oracle.truffle.nfi.NFILibrary.library:Ljava/lang/Object;
         2: .line 70
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            putfield com.oracle.truffle.nfi.NFILibrary.symbols:Ljava/util/Map;
         3: .line 71
            return
        end local 1 // java.lang.Object library
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    4     1  library  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
         Name  Flags
      library  

  java.lang.Object getLibrary();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
         0: .line 74
            aload 0 /* this */
            getfield com.oracle.truffle.nfi.NFILibrary.library:Ljava/lang/Object;
            areturn
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/nfi/NFILibrary;

  java.lang.Object findSymbol(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.String name
         0: .line 79
            aload 0 /* this */
            getfield com.oracle.truffle.nfi.NFILibrary.symbols:Ljava/util/Map;
            aload 1 /* name */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.String name
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    1     1  name  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      name  

  void preBindSymbol(java.lang.String, java.lang.Object);
    descriptor: (Ljava/lang/String;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.String name
        start local 2 // java.lang.Object symbol
         0: .line 84
            aload 0 /* this */
            getfield com.oracle.truffle.nfi.NFILibrary.symbols:Ljava/util/Map;
            aload 1 /* name */
            aload 2 /* symbol */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 85
            return
        end local 2 // java.lang.Object symbol
        end local 1 // java.lang.String name
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    2     1    name  Ljava/lang/String;
            0    2     2  symbol  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
        Name  Flags
      name    
      symbol  

  boolean hasMembers();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
         0: .line 90
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/nfi/NFILibrary;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  com.oracle.truffle.nfi.NFILibrary$Keys getMembers(boolean);
    descriptor: (Z)Lcom/oracle/truffle/nfi/NFILibrary$Keys;
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // boolean includeInternal
         0: .line 96
            new com.oracle.truffle.nfi.NFILibrary$Keys
            dup
            aload 0 /* this */
            getfield com.oracle.truffle.nfi.NFILibrary.symbols:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            invokeinterface java.util.Set.toArray:()[Ljava/lang/Object;
            invokespecial com.oracle.truffle.nfi.NFILibrary$Keys.<init>:([Ljava/lang/Object;)V
            areturn
        end local 1 // boolean includeInternal
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    1     0             this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    1     1  includeInternal  Z
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
                 Name  Flags
      includeInternal  

  boolean isMemberReadable(java.lang.String, com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (Ljava/lang/String;Lcom/oracle/truffle/api/interop/InteropLibrary;)Z
    flags: (0x0000) 
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.String symbol
        start local 2 // com.oracle.truffle.api.interop.InteropLibrary recursive
         0: .line 103
            aload 2 /* recursive */
            aload 0 /* this */
            invokevirtual com.oracle.truffle.nfi.NFILibrary.getLibrary:()Ljava/lang/Object;
            aload 1 /* symbol */
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.isMemberReadable:(Ljava/lang/Object;Ljava/lang/String;)Z
            ireturn
        end local 2 // com.oracle.truffle.api.interop.InteropLibrary recursive
        end local 1 // java.lang.String symbol
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    1     0       this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    1     1     symbol  Ljava/lang/String;
            0    1     2  recursive  Lcom/oracle/truffle/api/interop/InteropLibrary;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage(limit = "3")
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.library.CachedLibrary(value = "this.getLibrary()")
    MethodParameters:
           Name  Flags
      symbol     
      recursive  

  java.lang.Object readMember(java.lang.String, com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (Ljava/lang/String;Lcom/oracle/truffle/api/interop/InteropLibrary;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.String symbol
        start local 2 // com.oracle.truffle.api.interop.InteropLibrary recursive
         0: .line 109
            aload 0 /* this */
            aload 1 /* symbol */
            invokevirtual com.oracle.truffle.nfi.NFILibrary.findSymbol:(Ljava/lang/String;)Ljava/lang/Object;
            astore 3 /* preBound */
        start local 3 // java.lang.Object preBound
         1: .line 110
            aload 3 /* preBound */
            ifnull 3
         2: .line 111
            aload 3 /* preBound */
            areturn
         3: .line 113
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 2 /* recursive */
            aload 0 /* this */
            invokevirtual com.oracle.truffle.nfi.NFILibrary.getLibrary:()Ljava/lang/Object;
            aload 1 /* symbol */
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.readMember:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
            areturn
        end local 3 // java.lang.Object preBound
        end local 2 // com.oracle.truffle.api.interop.InteropLibrary recursive
        end local 1 // java.lang.String symbol
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    4     0       this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    4     1     symbol  Ljava/lang/String;
            0    4     2  recursive  Lcom/oracle/truffle/api/interop/InteropLibrary;
            1    4     3   preBound  Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException, com.oracle.truffle.api.interop.UnknownIdentifierException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage(limit = "3")
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.library.CachedLibrary(value = "this.getLibrary()")
    MethodParameters:
           Name  Flags
      symbol     
      recursive  

  boolean isMemberInvocable(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0000) 
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.String symbol
         0: .line 120
            iconst_1
            ireturn
        end local 1 // java.lang.String symbol
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    1     1  symbol  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
        Name  Flags
      symbol  

  java.lang.Object invokeMember(java.lang.String, java.lang.Object[], com.oracle.truffle.api.interop.InteropLibrary, com.oracle.truffle.api.profiles.BranchProfile);
    descriptor: (Ljava/lang/String;[Ljava/lang/Object;Lcom/oracle/truffle/api/interop/InteropLibrary;Lcom/oracle/truffle/api/profiles/BranchProfile;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=3, locals=6, args_size=5
        start local 0 // com.oracle.truffle.nfi.NFILibrary this
        start local 1 // java.lang.String symbol
        start local 2 // java.lang.Object[] args
        start local 3 // com.oracle.truffle.api.interop.InteropLibrary executables
        start local 4 // com.oracle.truffle.api.profiles.BranchProfile exception
         0: .line 127
            aload 0 /* this */
            aload 1 /* symbol */
            invokevirtual com.oracle.truffle.nfi.NFILibrary.findSymbol:(Ljava/lang/String;)Ljava/lang/Object;
            astore 5 /* preBound */
        start local 5 // java.lang.Object preBound
         1: .line 128
            aload 5 /* preBound */
            ifnonnull 4
         2: .line 129
            aload 4 /* exception */
            invokevirtual com.oracle.truffle.api.profiles.BranchProfile.enter:()V
         3: .line 130
            aload 1 /* symbol */
            invokestatic com.oracle.truffle.api.interop.UnknownIdentifierException.create:(Ljava/lang/String;)Lcom/oracle/truffle/api/interop/UnknownIdentifierException;
            athrow
         4: .line 132
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 3 /* executables */
            aload 5 /* preBound */
            aload 2 /* args */
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.execute:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 5 // java.lang.Object preBound
        end local 4 // com.oracle.truffle.api.profiles.BranchProfile exception
        end local 3 // com.oracle.truffle.api.interop.InteropLibrary executables
        end local 2 // java.lang.Object[] args
        end local 1 // java.lang.String symbol
        end local 0 // com.oracle.truffle.nfi.NFILibrary this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    5     0         this  Lcom/oracle/truffle/nfi/NFILibrary;
            0    5     1       symbol  Ljava/lang/String;
            0    5     2         args  [Ljava/lang/Object;
            0    5     3  executables  Lcom/oracle/truffle/api/interop/InteropLibrary;
            0    5     4    exception  Lcom/oracle/truffle/api/profiles/BranchProfile;
            1    5     5     preBound  Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnknownIdentifierException, com.oracle.truffle.api.interop.ArityException, com.oracle.truffle.api.interop.UnsupportedTypeException, com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
      2:
        com.oracle.truffle.api.library.CachedLibrary(limit = "3")
      3:
        com.oracle.truffle.api.dsl.Cached()
    MethodParameters:
             Name  Flags
      symbol       
      args         
      executables  
      exception    

  static boolean hasLanguage(com.oracle.truffle.nfi.NFILibrary);
    descriptor: (Lcom/oracle/truffle/nfi/NFILibrary;)Z
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.nfi.NFILibrary lib
         0: .line 138
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.nfi.NFILibrary lib
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0   lib  Lcom/oracle/truffle/nfi/NFILibrary;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
      Name  Flags
      lib   

  static java.lang.Class<? extends com.oracle.truffle.api.TruffleLanguage<?>> getLanguage(com.oracle.truffle.nfi.NFILibrary);
    descriptor: (Lcom/oracle/truffle/nfi/NFILibrary;)Ljava/lang/Class;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.nfi.NFILibrary receiver
         0: .line 144
            ldc Lcom/oracle/truffle/nfi/NFILanguage;
            areturn
        end local 0 // com.oracle.truffle.nfi.NFILibrary receiver
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0  receiver  Lcom/oracle/truffle/nfi/NFILibrary;
    Signature: (Lcom/oracle/truffle/nfi/NFILibrary;)Ljava/lang/Class<+Lcom/oracle/truffle/api/TruffleLanguage<*>;>;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
          Name  Flags
      receiver  

  static java.lang.Object toDisplayString(com.oracle.truffle.nfi.NFILibrary, boolean);
    descriptor: (Lcom/oracle/truffle/nfi/NFILibrary;Z)Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.nfi.NFILibrary receiver
        start local 1 // boolean allowSideEffects
         0: .line 150
            ldc "Native Library"
            areturn
        end local 1 // boolean allowSideEffects
        end local 0 // com.oracle.truffle.nfi.NFILibrary receiver
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0          receiver  Lcom/oracle/truffle/nfi/NFILibrary;
            0    1     1  allowSideEffects  Z
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
                  Name  Flags
      receiver          
      allowSideEffects  
}
SourceFile: "NFILibrary.java"
NestMembers:
  com.oracle.truffle.nfi.NFILibrary$Keys
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  final Keys = com.oracle.truffle.nfi.NFILibrary$Keys of com.oracle.truffle.nfi.NFILibrary
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)