https://www.graalvm.org/ 
final class com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext extends com.oracle.truffle.polyglot.PolyglotReferences$AbstractContextReference
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext
  super_class: com.oracle.truffle.polyglot.PolyglotReferences$AbstractContextReference
{
  private static final java.lang.Object NO_CONTEXT;
    descriptor: Ljava/lang/Object;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private final com.oracle.truffle.polyglot.PolyglotLanguage language;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotLanguage;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private volatile java.lang.Object languageContextImpl;
    descriptor: Ljava/lang/Object;
    flags: (0x0042) ACC_PRIVATE, ACC_VOLATILE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$CompilationFinal()

  private volatile com.oracle.truffle.polyglot.PolyglotLanguageContext languageContext;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;
    flags: (0x0042) ACC_PRIVATE, ACC_VOLATILE

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 270
            ldc Lcom/oracle/truffle/polyglot/PolyglotReferences;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.$assertionsDisabled:Z
         3: .line 272
            new java.lang.Object
            dup
            invokespecial java.lang.Object.<init>:()V
            putstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.NO_CONTEXT:Ljava/lang/Object;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>(com.oracle.truffle.polyglot.PolyglotLanguage);
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotLanguage;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
        start local 1 // com.oracle.truffle.polyglot.PolyglotLanguage language
         0: .line 280
            aload 0 /* this */
            invokespecial com.oracle.truffle.polyglot.PolyglotReferences$AbstractContextReference.<init>:()V
         1: .line 275
            aload 0 /* this */
            getstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.NO_CONTEXT:Ljava/lang/Object;
            putfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.languageContextImpl:Ljava/lang/Object;
         2: .line 281
            aload 0 /* this */
            aload 1 /* language */
            putfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.language:Lcom/oracle/truffle/polyglot/PolyglotLanguage;
         3: .line 282
            return
        end local 1 // com.oracle.truffle.polyglot.PolyglotLanguage language
        end local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Lcom/oracle/truffle/polyglot/PolyglotReferences$StrongSingleContext;
            0    4     1  language  Lcom/oracle/truffle/polyglot/PolyglotLanguage;
    MethodParameters:
          Name  Flags
      language  

  public java.lang.Object get();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
         0: .line 286
            getstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.$assertionsDisabled:Z
            ifne 1
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.language:Lcom/oracle/truffle/polyglot/PolyglotLanguage;
            invokevirtual com.oracle.truffle.polyglot.PolyglotLanguage.assertCorrectEngine:()Z
            ifne 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 287
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.languageContextImpl:Ljava/lang/Object;
            astore 1 /* context */
        start local 1 // java.lang.Object context
         2: .line 288
            aload 1 /* context */
            getstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.NO_CONTEXT:Ljava/lang/Object;
            if_acmpne 5
         3: .line 289
            invokestatic com.oracle.truffle.api.CompilerDirectives.transferToInterpreterAndInvalidate:()V
         4: .line 290
            aload 0 /* this */
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.language:Lcom/oracle/truffle/polyglot/PolyglotLanguage;
            invokevirtual com.oracle.truffle.polyglot.PolyglotLanguage.getCurrentLanguageContext:()Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;
            invokevirtual com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.initialize:(Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;)Ljava/lang/Object;
            astore 1 /* context */
         5: .line 292
      StackMap locals: java.lang.Object
      StackMap stack:
            getstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.$assertionsDisabled:Z
            ifne 6
            aload 1 /* context */
            invokestatic com.oracle.truffle.polyglot.PolyglotReferences.checkContextCollected:(Ljava/lang/Object;)Z
            ifne 6
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         6: .line 293
      StackMap locals:
      StackMap stack:
            getstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.$assertionsDisabled:Z
            ifne 7
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.languageContext:Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;
            aload 1 /* context */
            invokestatic com.oracle.truffle.polyglot.PolyglotReferences.assertDirectContextAccess:(Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;Ljava/lang/Object;)Z
            ifne 7
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         7: .line 294
      StackMap locals:
      StackMap stack:
            aload 1 /* context */
            areturn
        end local 1 // java.lang.Object context
        end local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    8     0     this  Lcom/oracle/truffle/polyglot/PolyglotReferences$StrongSingleContext;
            2    8     1  context  Ljava/lang/Object;

  private java.lang.Object initialize(com.oracle.truffle.polyglot.PolyglotLanguageContext);
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;)Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
        start local 1 // com.oracle.truffle.polyglot.PolyglotLanguageContext langContext
         0: .line 299
            getstatic com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.$assertionsDisabled:Z
            ifne 1
            aload 0 /* this */
            aload 1 /* langContext */
            invokevirtual com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.setLanguageContext:(Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;)Z
            ifne 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 300
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* langContext */
            invokevirtual com.oracle.truffle.polyglot.PolyglotLanguageContext.getContextImpl:()Ljava/lang/Object;
            dup
            astore 2 /* context */
        start local 2 // java.lang.Object context
         2: putfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.languageContextImpl:Ljava/lang/Object;
         3: .line 301
            aload 2 /* context */
            areturn
        end local 2 // java.lang.Object context
        end local 1 // com.oracle.truffle.polyglot.PolyglotLanguageContext langContext
        end local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0         this  Lcom/oracle/truffle/polyglot/PolyglotReferences$StrongSingleContext;
            0    4     1  langContext  Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;
            2    4     2      context  Ljava/lang/Object;
    MethodParameters:
             Name  Flags
      langContext  

  private boolean setLanguageContext(com.oracle.truffle.polyglot.PolyglotLanguageContext);
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;)Z
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
        start local 1 // com.oracle.truffle.polyglot.PolyglotLanguageContext langContext
         0: .line 305
            aload 0 /* this */
            aload 1 /* langContext */
            putfield com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext.languageContext:Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;
         1: .line 306
            iconst_1
            ireturn
        end local 1 // com.oracle.truffle.polyglot.PolyglotLanguageContext langContext
        end local 0 // com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    2     0         this  Lcom/oracle/truffle/polyglot/PolyglotReferences$StrongSingleContext;
            0    2     1  langContext  Lcom/oracle/truffle/polyglot/PolyglotLanguageContext;
    MethodParameters:
             Name  Flags
      langContext  
}
SourceFile: "PolyglotReferences.java"
NestHost: com.oracle.truffle.polyglot.PolyglotReferences
InnerClasses:
  public abstract CompilationFinal = com.oracle.truffle.api.CompilerDirectives$CompilationFinal of com.oracle.truffle.api.CompilerDirectives
  abstract AbstractContextReference = com.oracle.truffle.polyglot.PolyglotReferences$AbstractContextReference of com.oracle.truffle.polyglot.PolyglotReferences
  private final StrongSingleContext = com.oracle.truffle.polyglot.PolyglotReferences$StrongSingleContext of com.oracle.truffle.polyglot.PolyglotReferences