https://openjdk.java.net/ 
public interface sun.jvm.hotspot.interpreter.BytecodeVisitor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.jvm.hotspot.interpreter.BytecodeVisitor
  super_class: java.lang.Object
{
  public abstract void prologue(sun.jvm.hotspot.oops.Method);
    descriptor: (Lsun/jvm/hotspot/oops/Method;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
        Name  Flags
      method  

  public abstract void visit(sun.jvm.hotspot.interpreter.Bytecode);
    descriptor: (Lsun/jvm/hotspot/interpreter/Bytecode;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
          Name  Flags
      bytecode  

  public abstract void epilogue();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "BytecodeVisitor.java"