https://www.graalvm.org/ 
class com.oracle.truffle.tools.profiler.CPUSampler$2 implements java.util.function.BiConsumer<com.oracle.truffle.tools.profiler.CPUSampler$Payload, com.oracle.truffle.tools.profiler.CPUSampler$Payload>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tools.profiler.CPUSampler$2
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.tools.profiler.CPUSampler$2 this
         0: .line 434
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tools.profiler.CPUSampler$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tools/profiler/CPUSampler$2;

  public void accept(com.oracle.truffle.tools.profiler.CPUSampler$Payload, com.oracle.truffle.tools.profiler.CPUSampler$Payload);
    descriptor: (Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=3
        start local 0 // com.oracle.truffle.tools.profiler.CPUSampler$2 this
        start local 1 // com.oracle.truffle.tools.profiler.CPUSampler$Payload sourcePayload
        start local 2 // com.oracle.truffle.tools.profiler.CPUSampler$Payload destinationPayload
         0: .line 437
            aload 2 /* destinationPayload */
            dup
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.selfCompiledHitCount:I
            aload 1 /* sourcePayload */
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.selfCompiledHitCount:I
            iadd
            putfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.selfCompiledHitCount:I
         1: .line 438
            aload 2 /* destinationPayload */
            dup
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.selfInterpretedHitCount:I
            aload 1 /* sourcePayload */
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.selfInterpretedHitCount:I
            iadd
            putfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.selfInterpretedHitCount:I
         2: .line 439
            aload 2 /* destinationPayload */
            dup
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.compiledHitCount:I
            aload 1 /* sourcePayload */
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.compiledHitCount:I
            iadd
            putfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.compiledHitCount:I
         3: .line 440
            aload 2 /* destinationPayload */
            dup
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.interpretedHitCount:I
            aload 1 /* sourcePayload */
            getfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.interpretedHitCount:I
            iadd
            putfield com.oracle.truffle.tools.profiler.CPUSampler$Payload.interpretedHitCount:I
         4: .line 441
            aload 1 /* sourcePayload */
            invokevirtual com.oracle.truffle.tools.profiler.CPUSampler$Payload.getSelfHitTimes:()Ljava/util/List;
            invokeinterface java.util.List.iterator:()Ljava/util/Iterator;
            astore 4
            goto 7
      StackMap locals: com.oracle.truffle.tools.profiler.CPUSampler$2 com.oracle.truffle.tools.profiler.CPUSampler$Payload com.oracle.truffle.tools.profiler.CPUSampler$Payload top java.util.Iterator
      StackMap stack:
         5: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Long
            astore 3 /* timestamp */
        start local 3 // java.lang.Long timestamp
         6: .line 442
            aload 2 /* destinationPayload */
            aload 3 /* timestamp */
            invokevirtual com.oracle.truffle.tools.profiler.CPUSampler$Payload.addSelfHitTime:(Ljava/lang/Long;)V
        end local 3 // java.lang.Long timestamp
         7: .line 441
      StackMap locals:
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 5
         8: .line 444
            return
        end local 2 // com.oracle.truffle.tools.profiler.CPUSampler$Payload destinationPayload
        end local 1 // com.oracle.truffle.tools.profiler.CPUSampler$Payload sourcePayload
        end local 0 // com.oracle.truffle.tools.profiler.CPUSampler$2 this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    9     0                this  Lcom/oracle/truffle/tools/profiler/CPUSampler$2;
            0    9     1       sourcePayload  Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;
            0    9     2  destinationPayload  Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;
            6    7     3           timestamp  Ljava/lang/Long;
    MethodParameters:
                    Name  Flags
      sourcePayload       
      destinationPayload  

  public void accept(java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            checkcast com.oracle.truffle.tools.profiler.CPUSampler$Payload
            aload 2
            checkcast com.oracle.truffle.tools.profiler.CPUSampler$Payload
            invokevirtual com.oracle.truffle.tools.profiler.CPUSampler$2.accept:(Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/function/BiConsumer<Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;Lcom/oracle/truffle/tools/profiler/CPUSampler$Payload;>;
SourceFile: "CPUSampler.java"
EnclosingMethod: com.oracle.truffle.tools.profiler.CPUSampler
NestHost: com.oracle.truffle.tools.profiler.CPUSampler
InnerClasses:
  com.oracle.truffle.tools.profiler.CPUSampler$2
  public final Payload = com.oracle.truffle.tools.profiler.CPUSampler$Payload of com.oracle.truffle.tools.profiler.CPUSampler