https://www.graalvm.org/ 
class com.oracle.truffle.api.debug.test.NestedContextTest$1 implements com.oracle.truffle.api.debug.SuspendedCallback
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.debug.test.NestedContextTest$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.api.debug.test.NestedContextTest this$0;
    descriptor: Lcom/oracle/truffle/api/debug/test/NestedContextTest;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final org.graalvm.polyglot.Context val$context;
    descriptor: Lorg/graalvm/polyglot/Context;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final org.graalvm.polyglot.Source val$testSource;
    descriptor: Lorg/graalvm/polyglot/Source;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final java.util.concurrent.atomic.AtomicInteger val$suspensionCount;
    descriptor: Ljava/util/concurrent/atomic/AtomicInteger;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.debug.test.NestedContextTest, org.graalvm.polyglot.Context, org.graalvm.polyglot.Source, java.util.concurrent.atomic.AtomicInteger);
    descriptor: (Lcom/oracle/truffle/api/debug/test/NestedContextTest;Lorg/graalvm/polyglot/Context;Lorg/graalvm/polyglot/Source;Ljava/util/concurrent/atomic/AtomicInteger;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=5, args_size=5
        start local 0 // com.oracle.truffle.api.debug.test.NestedContextTest$1 this
         0: .line 112
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.debug.test.NestedContextTest$1.this$0:Lcom/oracle/truffle/api/debug/test/NestedContextTest;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.api.debug.test.NestedContextTest$1.val$context:Lorg/graalvm/polyglot/Context;
            aload 0 /* this */
            aload 3
            putfield com.oracle.truffle.api.debug.test.NestedContextTest$1.val$testSource:Lorg/graalvm/polyglot/Source;
            aload 0 /* this */
            aload 4
            putfield com.oracle.truffle.api.debug.test.NestedContextTest$1.val$suspensionCount:Ljava/util/concurrent/atomic/AtomicInteger;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.debug.test.NestedContextTest$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/NestedContextTest$1;
    MethodParameters:
                     Name  Flags
      this$0               final
      val$context          final
      val$testSource       final
      val$suspensionCount  final

  public void onSuspend(com.oracle.truffle.api.debug.SuspendedEvent);
    descriptor: (Lcom/oracle/truffle/api/debug/SuspendedEvent;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.NestedContextTest$1 this
        start local 1 // com.oracle.truffle.api.debug.SuspendedEvent event
         0: .line 114
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.NestedContextTest$1.this$0:Lcom/oracle/truffle/api/debug/test/NestedContextTest;
            aload 1 /* event */
            iconst_3
            iconst_1
            ldc "STATEMENT"
            iconst_0
            anewarray java.lang.String
            invokevirtual com.oracle.truffle.api.debug.test.NestedContextTest.checkState:(Lcom/oracle/truffle/api/debug/SuspendedEvent;IZLjava/lang/String;[Ljava/lang/String;)Lcom/oracle/truffle/api/debug/SuspendedEvent;
            pop
         1: .line 116
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.NestedContextTest$1.val$context:Lorg/graalvm/polyglot/Context;
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.NestedContextTest$1.val$testSource:Lorg/graalvm/polyglot/Source;
            invokevirtual org.graalvm.polyglot.Context.eval:(Lorg/graalvm/polyglot/Source;)Lorg/graalvm/polyglot/Value;
            pop
         2: .line 117
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.NestedContextTest$1.val$suspensionCount:Ljava/util/concurrent/atomic/AtomicInteger;
            invokevirtual java.util.concurrent.atomic.AtomicInteger.incrementAndGet:()I
            pop
         3: .line 118
            return
        end local 1 // com.oracle.truffle.api.debug.SuspendedEvent event
        end local 0 // com.oracle.truffle.api.debug.test.NestedContextTest$1 this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/oracle/truffle/api/debug/test/NestedContextTest$1;
            0    4     1  event  Lcom/oracle/truffle/api/debug/SuspendedEvent;
    MethodParameters:
       Name  Flags
      event  
}
SourceFile: "NestedContextTest.java"
EnclosingMethod: com.oracle.truffle.api.debug.test.NestedContextTest.testRecursiveEval:()V
NestHost: com.oracle.truffle.api.debug.test.NestedContextTest
InnerClasses:
  com.oracle.truffle.api.debug.test.NestedContextTest$1