https://www.graalvm.org/ 
class com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1 implements java.util.function.Function<java.lang.Thread, com.oracle.truffle.tools.profiler.ProfilerNode<com.oracle.truffle.tools.profiler.MemoryTracer$Payload>>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.tools.profiler.MemoryTracer$Listener this$1;
    descriptor: Lcom/oracle/truffle/tools/profiler/MemoryTracer$Listener;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.tools.profiler.MemoryTracer$Listener);
    descriptor: (Lcom/oracle/truffle/tools/profiler/MemoryTracer$Listener;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1 this
         0: .line 371
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1.this$1:Lcom/oracle/truffle/tools/profiler/MemoryTracer$Listener;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tools/profiler/MemoryTracer$Listener$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public com.oracle.truffle.tools.profiler.ProfilerNode<com.oracle.truffle.tools.profiler.MemoryTracer$Payload> apply(java.lang.Thread);
    descriptor: (Ljava/lang/Thread;)Lcom/oracle/truffle/tools/profiler/ProfilerNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1 this
        start local 1 // java.lang.Thread thread
         0: .line 374
            new com.oracle.truffle.tools.profiler.ProfilerNode
            dup
            invokespecial com.oracle.truffle.tools.profiler.ProfilerNode.<init>:()V
            areturn
        end local 1 // java.lang.Thread thread
        end local 0 // com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/tools/profiler/MemoryTracer$Listener$1;
            0    1     1  thread  Ljava/lang/Thread;
    Signature: (Ljava/lang/Thread;)Lcom/oracle/truffle/tools/profiler/ProfilerNode<Lcom/oracle/truffle/tools/profiler/MemoryTracer$Payload;>;
    MethodParameters:
        Name  Flags
      thread  

  public java.lang.Object apply(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Thread
            invokevirtual com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1.apply:(Ljava/lang/Thread;)Lcom/oracle/truffle/tools/profiler/ProfilerNode;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/function/Function<Ljava/lang/Thread;Lcom/oracle/truffle/tools/profiler/ProfilerNode<Lcom/oracle/truffle/tools/profiler/MemoryTracer$Payload;>;>;
SourceFile: "MemoryTracer.java"
EnclosingMethod: com.oracle.truffle.tools.profiler.MemoryTracer$Listener.handleEvent:(Lcom/oracle/truffle/tools/profiler/ShadowStack$ThreadLocalStack;Lcom/oracle/truffle/tools/profiler/MemoryTracer$AllocationEventInfo;)Z
NestHost: com.oracle.truffle.tools.profiler.MemoryTracer
InnerClasses:
  public final AllocationEventInfo = com.oracle.truffle.tools.profiler.MemoryTracer$AllocationEventInfo of com.oracle.truffle.tools.profiler.MemoryTracer
  private final Listener = com.oracle.truffle.tools.profiler.MemoryTracer$Listener of com.oracle.truffle.tools.profiler.MemoryTracer
  com.oracle.truffle.tools.profiler.MemoryTracer$Listener$1
  public final Payload = com.oracle.truffle.tools.profiler.MemoryTracer$Payload of com.oracle.truffle.tools.profiler.MemoryTracer
  final ThreadLocalStack = com.oracle.truffle.tools.profiler.ShadowStack$ThreadLocalStack of com.oracle.truffle.tools.profiler.ShadowStack