https://www.graalvm.org/ 
public class com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject
  super_class: java.lang.Object
{
  private final java.util.Map<java.lang.String, java.lang.Object> invocables;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;

  public void <init>(java.util.Map<java.lang.String, java.lang.Object>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // java.util.Map invocables
         0: .line 129
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 130
            aload 0 /* this */
            aload 1 /* invocables */
            putfield com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject.invocables:Ljava/util/Map;
         2: .line 131
            return
        end local 1 // java.util.Map invocables
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    3     0        this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    3     1  invocables  Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;
    Signature: (Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;)V
    MethodParameters:
            Name  Flags
      invocables  

  public boolean hasMembers();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
         0: .line 135
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  final java.lang.Object readMember(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // java.lang.String key
         0: .line 142
            invokestatic com.oracle.truffle.api.interop.UnsupportedMessageException.create:()Lcom/oracle/truffle/api/interop/UnsupportedMessageException;
            athrow
        end local 1 // java.lang.String key
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    1     1   key  Ljava/lang/String;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      key   

  final java.lang.Object invokeMember(java.lang.String, java.lang.Object[]);
    descriptor: (Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // java.lang.String key
        start local 2 // java.lang.Object[] args
         0: .line 148
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject.invocables:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 149
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject.invocables:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
         2: .line 151
      StackMap locals:
      StackMap stack:
            aload 1 /* key */
            invokestatic com.oracle.truffle.api.interop.UnknownIdentifierException.create:(Ljava/lang/String;)Lcom/oracle/truffle/api/interop/UnknownIdentifierException;
            athrow
        end local 2 // java.lang.Object[] args
        end local 1 // java.lang.String key
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    3     1   key  Ljava/lang/String;
            0    3     2  args  [Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnknownIdentifierException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      key   
      args  

  final boolean isMemberInvocable(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0010) ACC_FINAL
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // java.lang.String key
         0: .line 158
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject.invocables:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 159
            iconst_1
            ireturn
         2: .line 161
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 1 // java.lang.String key
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    3     1   key  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      key   

  final boolean isMemberExisting(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0010) ACC_FINAL
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // java.lang.String key
         0: .line 167
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject.invocables:Ljava/util/Map;
            aload 1 /* key */
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.String key
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    1     1   key  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      key   

  final boolean isMemberReadable(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0010) ACC_FINAL
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // java.lang.String key
         0: .line 174
            iconst_0
            ireturn
        end local 1 // java.lang.String key
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    1     1   key  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    MethodParameters:
      Name  Flags
      key   

  final java.lang.Object getMembers(boolean, com.oracle.truffle.js.runtime.JSRealm);
    descriptor: (ZLcom/oracle/truffle/js/runtime/JSRealm;)Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL
    Code:
      stack=3, locals=5, args_size=3
        start local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
        start local 1 // boolean includeInternal
        start local 2 // com.oracle.truffle.js.runtime.JSRealm realm
         0: .line 181
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject.invocables:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            astore 3 /* keys */
        start local 3 // java.util.Set keys
         1: .line 182
            aload 2 /* realm */
            invokevirtual com.oracle.truffle.js.runtime.JSRealm.getEnv:()Lcom/oracle/truffle/api/TruffleLanguage$Env;
            astore 4 /* env */
        start local 4 // com.oracle.truffle.api.TruffleLanguage$Env env
         2: .line 183
            aload 4 /* env */
            aload 3 /* keys */
            aload 3 /* keys */
            invokeinterface java.util.Set.size:()I
            anewarray java.lang.Object
            invokeinterface java.util.Set.toArray:([Ljava/lang/Object;)[Ljava/lang/Object;
            invokevirtual com.oracle.truffle.api.TruffleLanguage$Env.asGuestValue:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 4 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 3 // java.util.Set keys
        end local 2 // com.oracle.truffle.js.runtime.JSRealm realm
        end local 1 // boolean includeInternal
        end local 0 // com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    3     0             this  Lcom/oracle/truffle/js/test/interop/JSONStringifyInteropTest$InvocableMemberObject;
            0    3     1  includeInternal  Z
            0    3     2            realm  Lcom/oracle/truffle/js/runtime/JSRealm;
            1    3     3             keys  Ljava/util/Set<Ljava/lang/String;>;
            2    3     4              env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.dsl.CachedContext(value = Lcom/oracle/truffle/js/lang/JavaScriptLanguage;)
    MethodParameters:
                 Name  Flags
      includeInternal  
      realm            
}
SourceFile: "JSONStringifyInteropTest.java"
NestHost: com.oracle.truffle.js.test.interop.JSONStringifyInteropTest
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 InvocableMemberObject = com.oracle.truffle.js.test.interop.JSONStringifyInteropTest$InvocableMemberObject of com.oracle.truffle.js.test.interop.JSONStringifyInteropTest
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)