https://www.graalvm.org/ 
final class com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO
  super_class: java.lang.Object
{
  final java.util.Map map;
    descriptor: Ljava/util/Map;
    flags: (0x0010) ACC_FINAL

  void <init>(java.util.Map);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
        start local 1 // java.util.Map map
         0: .line 335
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 336
            aload 0 /* this */
            aload 1 /* map */
            putfield com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO.map:Ljava/util/Map;
         2: .line 337
            return
        end local 1 // java.util.Map map
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
            0    3     1   map  Ljava/util/Map;
    MethodParameters:
      Name  Flags
      map   

  boolean hasMembers();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
         0: .line 341
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  java.lang.Object getMembers(boolean);
    descriptor: (Z)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
        start local 1 // boolean includeInternal
         0: .line 347
            new com.oracle.truffle.api.test.host.AsCollectionsTest$MapKeysTO
            dup
            aload 0 /* this */
            getfield com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO.map:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            invokeinterface java.util.Set.toArray:()[Ljava/lang/Object;
            invokespecial com.oracle.truffle.api.test.host.AsCollectionsTest$MapKeysTO.<init>:([Ljava/lang/Object;)V
            areturn
        end local 1 // boolean includeInternal
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    1     0             this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
            0    1     1  includeInternal  Z
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
                 Name  Flags
      includeInternal  

  java.lang.Object readMember(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
        start local 1 // java.lang.String member
         0: .line 353
            aload 0 /* this */
            getfield com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO.map:Ljava/util/Map;
            aload 1 /* member */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            astore 2 /* value */
        start local 2 // java.lang.Object value
         1: .line 354
            aload 2 /* value */
            ifnonnull 3
         2: .line 355
            aload 1 /* member */
            invokestatic com.oracle.truffle.api.interop.UnknownIdentifierException.create:(Ljava/lang/String;)Lcom/oracle/truffle/api/interop/UnknownIdentifierException;
            athrow
         3: .line 357
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 2 /* value */
            areturn
        end local 2 // java.lang.Object value
        end local 1 // java.lang.String member
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
            0    4     1  member  Ljava/lang/String;
            1    4     2   value  Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException, com.oracle.truffle.api.interop.UnknownIdentifierException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
        Name  Flags
      member  

  void writeMember(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.api.test.host.AsCollectionsTest$MapBasedTO this
        start local 1 // java.lang.String member
        start local 2 // java.lang.Object value
         0: .line 364
            aload 0 /* this */
            getfield com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO.map:Ljava/util/Map;
            aload 1 /* member */
            aload 2 /* value */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 365
            return
        end local 2 // java.lang.Object value
        end local 1 // java.lang.String member
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
            0    2     1  member  Ljava/lang/String;
            0    2     2   value  Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException, com.oracle.truffle.api.interop.UnknownIdentifierException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
        Name  Flags
      member  
      value   

  boolean isMemberReadable(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
        start local 1 // java.lang.String member
         0: .line 371
            aload 1 /* member */
            aload 1 /* member */
            invokevirtual java.lang.String.contains:(Ljava/lang/CharSequence;)Z
            ireturn
        end local 1 // java.lang.String member
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
            0    1     1  member  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage$Repeat(value = {com.oracle.truffle.api.library.ExportMessage(name = "isMemberModifiable"), com.oracle.truffle.api.library.ExportMessage(name = "isMemberReadable")})
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
        Name  Flags
      member  

  boolean isMemberInsertable(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
        start local 1 // java.lang.String member
         0: .line 377
            aload 1 /* member */
            aload 1 /* member */
            invokevirtual java.lang.String.contains:(Ljava/lang/CharSequence;)Z
            ifeq 1
            iconst_0
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_1
      StackMap locals:
      StackMap stack: int
         2: ireturn
        end local 1 // java.lang.String member
        end local 0 // com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/oracle/truffle/api/test/host/AsCollectionsTest$MapBasedTO;
            0    3     1  member  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
        Name  Flags
      member  
}
SourceFile: "AsCollectionsTest.java"
NestHost: com.oracle.truffle.api.test.host.AsCollectionsTest
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  public abstract Repeat = com.oracle.truffle.api.library.ExportMessage$Repeat of com.oracle.truffle.api.library.ExportMessage
  final MapBasedTO = com.oracle.truffle.api.test.host.AsCollectionsTest$MapBasedTO of com.oracle.truffle.api.test.host.AsCollectionsTest
  final MapKeysTO = com.oracle.truffle.api.test.host.AsCollectionsTest$MapKeysTO of com.oracle.truffle.api.test.host.AsCollectionsTest
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)