code: private InsnList getVoidReturnTraceInstructions() {
          InsnList il = new InsnList();
          addGetCallback(il);
          il.add(new VarInsnNode(Opcodes.ALOAD, this.methodVarIndex));
          il.add(new VarInsnNode(Opcodes.ALOAD, this.executionIdIndex));
          il.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL,
                  "org/brutusin/instrumentation/Callback", "onVoidFinish",
                  "(Ljava/lang/Object;Ljava/lang/String;)V", false));
  
          return il;
      }
docs: /*