https://www.graalvm.org/ 
class com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot extends com.oracle.truffle.api.nodes.RootNode
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot
  super_class: com.oracle.truffle.api.nodes.RootNode
{
  com.oracle.truffle.api.nodes.Node node;
    descriptor: Lcom/oracle/truffle/api/nodes/Node;
    flags: (0x0000) 
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  private final java.util.concurrent.atomic.AtomicInteger lockedCount;
    descriptor: Ljava/util/concurrent/atomic/AtomicInteger;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.util.concurrent.atomic.AtomicInteger slowPathCount;
    descriptor: Ljava/util/concurrent/atomic/AtomicInteger;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(com.oracle.truffle.api.nodes.Node);
    descriptor: (Lcom/oracle/truffle/api/nodes/Node;)V
    flags: (0x0000) 
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
        start local 1 // com.oracle.truffle.api.nodes.Node node
         0: .line 280
            aload 0 /* this */
            aconst_null
            invokespecial com.oracle.truffle.api.nodes.RootNode.<init>:(Lcom/oracle/truffle/api/TruffleLanguage;)V
         1: .line 275
            aload 0 /* this */
            new java.util.concurrent.atomic.AtomicInteger
            dup
            iconst_0
            invokespecial java.util.concurrent.atomic.AtomicInteger.<init>:(I)V
            putfield com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot.lockedCount:Ljava/util/concurrent/atomic/AtomicInteger;
         2: .line 276
            aload 0 /* this */
            new java.util.concurrent.atomic.AtomicInteger
            dup
            iconst_0
            invokespecial java.util.concurrent.atomic.AtomicInteger.<init>:(I)V
            putfield com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot.slowPathCount:Ljava/util/concurrent/atomic/AtomicInteger;
         3: .line 281
            aload 0 /* this */
            aload 1 /* node */
            putfield com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot.node:Lcom/oracle/truffle/api/nodes/Node;
         4: .line 283
            ldc Lcom/oracle/truffle/api/nodes/RootNode;
            ldc "lock"
            invokevirtual java.lang.Class.getDeclaredField:(Ljava/lang/String;)Ljava/lang/reflect/Field;
            astore 2 /* lock */
        start local 2 // java.lang.reflect.Field lock
         5: .line 284
            aload 2 /* lock */
            iconst_1
            invokevirtual java.lang.reflect.Field.setAccessible:(Z)V
         6: .line 285
            aload 2 /* lock */
            aload 0 /* this */
            new com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot$1
            dup
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot$1.<init>:(Lcom/oracle/truffle/api/dsl/test/TestHelper$SlowPathCounterRoot;)V
            invokevirtual java.lang.reflect.Field.set:(Ljava/lang/Object;Ljava/lang/Object;)V
        end local 2 // java.lang.reflect.Field lock
         7: .line 301
            goto 10
      StackMap locals: com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot com.oracle.truffle.api.nodes.Node
      StackMap stack: java.lang.Exception
         8: astore 2 /* e */
        start local 2 // java.lang.Exception e
         9: .line 302
            new java.lang.AssertionError
            dup
            aload 2 /* e */
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
        end local 2 // java.lang.Exception e
        10: .line 304
      StackMap locals:
      StackMap stack:
            return
        end local 1 // com.oracle.truffle.api.nodes.Node node
        end local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   11     0  this  Lcom/oracle/truffle/api/dsl/test/TestHelper$SlowPathCounterRoot;
            0   11     1  node  Lcom/oracle/truffle/api/nodes/Node;
            5    7     2  lock  Ljava/lang/reflect/Field;
            9   10     2     e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           4     7       8  Class java.lang.Exception
    MethodParameters:
      Name  Flags
      node  

  public java.lang.Object execute(com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 308
            aconst_null
            areturn
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/oracle/truffle/api/dsl/test/TestHelper$SlowPathCounterRoot;
            0    1     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
    MethodParameters:
       Name  Flags
      frame  

  boolean isInSlowPath();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
         0: .line 312
            aload 0 /* this */
            getfield com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot.lockedCount:Ljava/util/concurrent/atomic/AtomicInteger;
            invokevirtual java.util.concurrent.atomic.AtomicInteger.get:()I
            ifle 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/api/dsl/test/TestHelper$SlowPathCounterRoot;

  int getSlowPathCount();
    descriptor: ()I
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
         0: .line 316
            aload 0 /* this */
            getfield com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot.slowPathCount:Ljava/util/concurrent/atomic/AtomicInteger;
            invokevirtual java.util.concurrent.atomic.AtomicInteger.get:()I
            ireturn
        end local 0 // com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/TestHelper$SlowPathCounterRoot;
}
SourceFile: "TestHelper.java"
NestHost: com.oracle.truffle.api.dsl.test.TestHelper
InnerClasses:
  SlowPathCounterRoot = com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot of com.oracle.truffle.api.dsl.test.TestHelper
  com.oracle.truffle.api.dsl.test.TestHelper$SlowPathCounterRoot$1
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node