https://www.graalvm.org/ 
final class com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference implements java.io.Closeable
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference
  super_class: java.lang.Object
{
  private final com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream out;
    descriptor: Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream err;
    descriptor: Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private org.graalvm.polyglot.Context context;
    descriptor: Lorg/graalvm/polyglot/Context;
    flags: (0x0002) ACC_PRIVATE

  private int refCount;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  void <init>(org.graalvm.polyglot.Context, com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream, com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream);
    descriptor: (Lorg/graalvm/polyglot/Context;Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
        start local 1 // org.graalvm.polyglot.Context context
        start local 2 // com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream out
        start local 3 // com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream err
         0: .line 430
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 431
            aload 0 /* this */
            aload 1 /* context */
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.context:Lorg/graalvm/polyglot/Context;
         2: .line 432
            aload 0 /* this */
            iconst_1
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
         3: .line 433
            aload 0 /* this */
            aload 2 /* out */
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.out:Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
         4: .line 434
            aload 0 /* this */
            aload 3 /* err */
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.err:Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
         5: .line 435
            return
        end local 3 // com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream err
        end local 2 // com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream out
        end local 1 // org.graalvm.polyglot.Context context
        end local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    6     0     this  Lcom/oracle/truffle/tck/tests/TestContext$RefCountedContextReference;
            0    6     1  context  Lorg/graalvm/polyglot/Context;
            0    6     2      out  Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
            0    6     3      err  Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
    MethodParameters:
         Name  Flags
      context  
      out      
      err      

  com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream out();
    descriptor: ()Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
         0: .line 438
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.out:Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
            areturn
        end local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tck/tests/TestContext$RefCountedContextReference;

  com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream err();
    descriptor: ()Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
         0: .line 442
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.err:Lcom/oracle/truffle/tck/tests/TestContext$ProxyOutputStream;
            areturn
        end local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tck/tests/TestContext$RefCountedContextReference;

  org.graalvm.polyglot.Context retain();
    descriptor: ()Lorg/graalvm/polyglot/Context;
    flags: (0x0000) 
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
         0: .line 446
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
            ifne 2
         1: .line 447
            new java.lang.IllegalStateException
            dup
            ldc "Released reference"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 449
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
            iconst_1
            iadd
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
         3: .line 450
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.context:Lorg/graalvm/polyglot/Context;
            areturn
        end local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/oracle/truffle/tck/tests/TestContext$RefCountedContextReference;

  boolean isValid();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
         0: .line 454
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
            ifle 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/tck/tests/TestContext$RefCountedContextReference;

  public void close();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
         0: .line 459
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
            ifne 2
         1: .line 460
            new java.lang.IllegalStateException
            dup
            ldc "Released reference"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 462
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            dup
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
            iconst_1
            isub
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
         3: .line 463
            aload 0 /* this */
            getfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.refCount:I
            ifne 5
         4: .line 464
            aload 0 /* this */
            aconst_null
            putfield com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference.context:Lorg/graalvm/polyglot/Context;
         5: .line 466
      StackMap locals:
      StackMap stack:
            return
        end local 0 // com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lcom/oracle/truffle/tck/tests/TestContext$RefCountedContextReference;
}
SourceFile: "TestContext.java"
NestHost: com.oracle.truffle.tck.tests.TestContext
InnerClasses:
  private final ProxyOutputStream = com.oracle.truffle.tck.tests.TestContext$ProxyOutputStream of com.oracle.truffle.tck.tests.TestContext
  private final RefCountedContextReference = com.oracle.truffle.tck.tests.TestContext$RefCountedContextReference of com.oracle.truffle.tck.tests.TestContext