Assignment 3 Description: Computer Systems (2000_…
Assignment 3 Description
Assignment 3 – Jack Compiler
Weighting and Due Dates
Marks for this assignment contribute 20% of the overall course mark.
Hurdle Requirement: If your mark for Assignment 3 is less than 20%, your overall
mark for the course will be capped at 45 F.
Marks for functionality will be awarded automatically by the web submission system.
Due dates: Milestone – 11:55pm Friday of week 11, Final – 11:55pm Monday of week
13.
Late penalties: For each part, the maximum mark awarded will be reduced by 25% per day
/ part day late. If your mark is greater than the maximum, it will be reduced to the maximum.
Core Body of Knowledge (CBOK) Areas: abstraction, design, hardware and software,
data and information, and programming.
Project Description
In this assignment you will complete a variation of projects 10 and 11 in the nand2tetris course,
reworked descriptions of Nand2Tetris Projects 10 and 11 are shown below. In particular, you
will write the following programs that are used to implement different components of an
optimising Jack compiler that compiles a Jack class into Hack Virtual Machine (VM) code:
parser – this parses a Jack program and constructs an abstract syntax tree.
codegen – this takes an abstract syntax tree and outputs equivalent VM code.
pretty – this takes an abstract syntax tree and produces a carefully formatted Jack program.
optimiser-r^ – this copies an abstract syntax tree and removes redundant code where
possible.
optimiser-e* – this copies an abstract syntax tree and evaluates expressions where
possible.
Notes:
^Only for students enrolled in the undergraduate offering, COMP SCI 2000.
*Only for students enrolled in the postgraduate offering, COMP SCI 7081.
SVN Repository
Note: this assignment assumes that you have already created directories for every assignment,
workshop, project and exam in your svn repository, as described on the Startup Files for
workshop, project and exam in your svn repository, as described on the Startup Files for
Workshops and Assignments (https://myuni.adelaide.edu.au/courses/64329/pages/startup-files-
for-workshops-and-assignments) page.
1. If required, checkout a working copy of the assignment3 directory from your svn repository.
2. Change directory to the working copy of the assignment3 directory.
3. Copy the latest startup files from the “View Feedback” tab of the “Assignment 3 – Submit
Here” assignment into the updates sub-directory. Do not unzip the file.
4. Run the following command to place the assignment’s startup files in the correct locations,
this will automatically add them to svn and then commit them to your repository:
% make install
5. Goto the Web Submission System and make a submission to the “Assignment 3 – Submit
Here” assignment.
Assignment 3 Files and Directories
In addition to the generic Makefile and updates sub-directory, the assignment3 directory
should now contain the following files and directories:
*.cpp C++ source files, you must edit these files to complete the assignment.
includes – this directory contains .h files for precompiled classes.
lib – this directory contains precompiled programs and components.
originals – this directory contains the original versions of the *.cpp files you are required to
edit.
tests – this directory contains a test script and test data.
parser – a script to run your parser program.
codegen – a script to run your codegen program.
pretty – a script to run your pretty program.
optimiser-r – a script to run your optimiser-r program.
optimiser-e – a script to run your optimiser-e program.
Note: you need to edit the *.cpp files to complete this assignment. All the other files are
automatically regenerated every time you run make, they must not be changed or added to
svn.
Note: if a newer version of the startup files is made available, it must be placed in the updates
sub-directory and added to svn. The next time make is run, all of the files will be updated
except for the *.cpp files.
Submission and Marking Scheme
Submissions for this assignment must be made to the web submission system
(https://cs.adelaide.edu.au/services/websubmission) assignment named: Assignment 3 –
(https://cs.adelaide.edu.au/services/websubmission) assignment named: Assignment 3 –
Submit Here. The assessment is based on “Assessment of Programming Assignments
(https://myuni.adelaide.edu.au/courses/64329/pages/assessment-of-programming-assignments) “.
Notes:
the marks for the Milestone Tests will be shown by the Assignment 3 – Milestone
assignment
the marks for the Final Tests will be shown by the Assignment 3 – UG – Final and the
Assignment 3 – PG – Final assignments
the participation marks for this assignment will be shown by the Assignment 3 – One Week
Pre Milestone and the Assignment 3 – Pre Milestone assignments
Your programs must be written in C++ and they will be compiled using the Makefile and
precompiled components in the lib directory. They will be tested using Jack language
programs that may or may not be syntactically correct. A wide range of tests will be run,
including some secret tests. Note: you will get no feedback on the secret tests, even if you
ask! Note: there is a single test script so all component programs will be tested regardless of
whether your are enrolled in COMP SCI 2000 or COMP SCI 7081.
Assignment 3 – Milestone Submissions: due 11:55pm Friday of
week 11
A mark out of 100 for the Milestone Tests will be awarded by the web submission system
(https://cs.adelaide.edu.au/services/websubmission) and will contribute up to 20% of your marks
for this assignment. The marks awarded will be automatically modified by a code review
program, as described on the Assessment of Programming Assignments
(https://myuni.adelaide.edu.au/courses/64329/pages/assessment-of-programming-assignments)
page. The marks for the Parser Tests are used as the marks for the milestone submission.
Assignment 3 – Final Submissions: due 11:55pm Monday of
week 13
A mark out of 100 for the Final Tests will be awarded by the web submission system
(https://cs.adelaide.edu.au/services/websubmission) and will contribute up to 80% of your marks
for this assignment. The marks awarded will be automatically modified by a code review
program, as described on the Assessment of Programming Assignments
(https://myuni.adelaide.edu.au/courses/64329/pages/assessment-of-programming-assignments)
page.
Your Final Assignment Mark will be the geometric mean of two components, the weighted
marks, MF, for the Milestone Tests, M, and Final Tests, F, and a mark for your logbook, L. It will
be limited to 10% more than the weighted marks, ie
MF = M * 0.2 + F * 0.8
FinalMark = MIN( 1.1 * MF, SQRT(MF * L) )
NOTE – A logbook mark of 0 results in a Final Submission mark of 0.
Logbook Marking
Important: the logbook must have entries for all work in this assignment, including your
milestone submissions. See “Assessment – Logbook Review
(https://myuni.adelaide.edu.au/courses/64329/pages/assessment-logbook-review) ” for details of
how your logbook will be assessed.
Assignment Weighting and Workload
The weighting of the tests using each program do not reflect the workload required to complete
each program. It is important to recognise this and to make sure that you do not spend an
excessive amount of time trying to complete everything at the expense of your other studies.
You need to make adequate time for revision for the quiz exams and to not take time away
from studying other courses.
The key learning outcomes are best achieved by first completing the parser (52%), which has
the highest weight, and then the code generator (28%). The optimiser programs (12%) may
take considerably more effort but contribute relatively little to the final grade and may be too
challenging for some. The pretty printer (8%) is similar to the code generator. This is a
summary of the tests weights for each submission and when combined 20 / 80:
Program
Milestone
20%
Final
80%
Combined
100%
parser 100% 40% 52%
codegen – 35% 28%
optimiser-
e/r
– 15% 12%
pretty – 10% 8%
Total 100% 100% 100%
Assignment 3 – Participation Marks
Any submissions to this assignment that are made at least one week before the due date for
Milestone Submissions may be awarded up to 5 participation marks. The participation marks
will be the marks awarded for the Final Tests divided by 20. Your logbook review mark will not
affect the participation marks. These participation marks will be allocated to week 12 and will
be shown by the Assignment 3 – One Week Pre Milestone assignment.
Any submissions to this assignment that are made before the due date for Milestone
Submissions may be awarded up to 5 participation marks. The participation marks will be the
marks awarded for the Final Tests divided by 20. Your logbook review mark will not affect the
participation marks. These participation marks will be allocated to week 12 and will be shown
by the Assignment 3 – Pre Milestone assignment.
Nand2Tetris Projects 10 & 11: Compiler I & II
Background
Modern compilers, like those of Java and C#, are multi-tiered: the compiler’s front-end
translates from the high-level language to an intermediate VM language; the compiler’s back-
end translates further from the VM language to the native code of the host platform. In an
earlier workshop we started building the back-end tier of the Jack Compiler (we called it the VM
Translator); we now turn to the construction of the compiler’s front-end. This construction will
span two parts: syntax analysis and code generation.
Objective
In this project we build a Syntax Analyser that parses Jack programs according to the Jack
grammar, producing an abstract syntax tree that captures the program’s structure. We
then write separate logic that can apply any number of transformations to our abstract syntax
tree. The transformations may include pretty printing the original program, applying specific
optimisations to the abstract syntax tree or generating VM code. This mirrors the approaches
used in the workshops.
Resources
The relevant reading for this project is Chapters 10 and 11. However, you should follow the
program structure used in earlier workshops rather than the proposed structure in Chapters 10
and 11. You must write your programs in C++. The startup files include test files and test
scripts you can use to check your work on this assignment. A set of precompiled classes
similar to those used in the workshops and the previous assignment are also provided.
Testing and IO
We have a provided a description of the specific requirements for each component program on
its own page. However before starting work on any of the component programs you should
review the pages on Testing and IO Controls.
Testing
Details of the test data including the how to review the results of each test are described on the
Assignment 3 | testing (https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-
testing) page.
IO Controls
Each component program has specific requirements for what it should or should not output
when it is working correctly and what to do when an error occurs. Unless specified otherwise,
the default error handling process for each component program is to terminate the program
with an exit status of 0 and to have not produced any output. Unfortunately, this can make it
difficult to trace the execution of your programs and get meaningful error messages from them
during development. To allow you to achieve both, a number of output buffering and error
reporting functions have been provided and are described on the Assignment 3 | io controls
(https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-io-controls) page.
Component Programs
parser
The parser program uses the provided tokeniser to parse a Jack program and construct an
equivalent abstract syntax tree. The specific requirements for this component program are
described on the Assignment 3 | parser
(https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-parser) page.
codegen
The codegen program traverses an abstract syntax tree to generate virtual machine code. The
specific requirements for this component program are described on the Assignment 3 |
codegen (https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-codegen) page.
pretty
The pretty program traverses an abstract syntax tree and prints a Jack program formatted to a
specific coding standard. The specific requirements for this component program are described
on the Assignment 3 | pretty (https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-
%7C-pretty) page.
optimiser-r^
The optimiser-r program traverses an abstract syntax tree and generates a new abstract
syntax tree with redundant code removed if possible. The specific requirements for this
component program are described on the Assignment 3 | optimiser_r
(https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-optimiser-r) page.
(https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-optimiser-r) page.
optimiser-e*
The optimiser-e program traverses an abstract syntax tree and generates a new abstract
syntax tree with all expressions pre-evaluated if possible. The specific requirements for this
component program are described on the Assignment 3 | optimiser_e
(https://myuni.adelaide.edu.au/courses/64329/pages/assignment-3-%7C-optimiser-e) page.