SW I & II > CSE 2231 > Schedule Sp 2026

Lab: BugsWorld Virtual Machine ByteCode Interpreter

Objective

In this lab you familiarize yourself with the BugsWorld virtual machine (VM) instruction set and behavior by writing and testing an interpreter of the VM byte code programs.

Setup

To get started, import the project for this lab, BugsWorldVMInterpreter, from the BugsWorldVMInterpreter.zip file available at this link. If you don't remember how to do this, see the Setup instructions in an earlier lab.

Method

  1. First carefully look through the file BugsWorldVMInterpreter.java in the src folder and make sure you understand what each method does, including the main method. Complete the body of the static method nextPrimitiveInstructionAddress by pasting the code you wrote for the homework into the skeleton provided.
  2. Open the file BugsWorldVMInterpreterTest.java in the test folder and review the test cases provided to see how they are set up and how they attempt to test your implementation of the interpreter. Run the JUnit test fixture and carefully review any test cases that fail. If that is not enough information to help you find the bug(s), you can also run the main program in BugsWorldVMInterpreter and interactively execute a compiled BL program. In the data folder you will find one sample BL program TestProgram.bl and its compiled version TestProgram.bo that you can use as input to the main program. Fix all the bugs and make sure your interpreter passes all the test cases to complete this lab.