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Assignment 3 Description
Assignment 3 – Jack Compiler
Weigh?ng and Due Dates
Marks for this assignment contribute 20% of the overall course mark.
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 Descrip?on
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.
lint^ – this takes an abstract syntax tree and annotates it with warning and / or error
messages.
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
- If required, checkout a working copy of the assignment3 directory from your svn repository.
- Change directory to the working copy of the assignment3 directory.
- Copy the newest zip file attached below into the updates sub-directory and add it to svn.
- Run the following command to place the assignment’s startup files in the correct locations:
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% make install
- Add the .cpp startup files and an empty tests directory to your svn repository:
% svn add *.cpp
% svn add –depth=empty tests
% svn commit -m “Assignment 3 Startup Files”
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, you can add your own tests too.
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.
lint – a script to run your lint 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. You can add extra test inputs to the tests directory but those are the only additional
directories / files that you may add 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/se… assignment named: Assignment 3 – Submit
Here. The assessment is based on “Assessment of Programming Assignments
(pages/assessment-of-programming-assignments) “.
Note: the Submit Here assignment will show a breakdown of your marks by category but it will
always show your total mark as capped at 0.
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
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some secret tests. Note: you will get no feedback on the secret tests, even if you ask! Note: 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
The marks awarded by the web submission system
(https://cs.adelaide.edu.au/se… for the milestone submission contribute up to
20% of your marks for assignment 3. The marks for the Parser Tests are used as the marks for
the milestone submission. Your milestone submission mark, after the application of late penalties,
will be posted to the myuni gradebook when the assignment marking is complete.
You can view the Parser Tests marks in the Milestone assignment but submissions must be made
using the Assignment 3 – Submit Here assignment.
Assignment 3 – Final Submissions: due 11:55pm Monday of week
13
Your final submission mark will be the geometric mean of the weighted marks awarded by the web
submission system
(https://cs.adelaide.edu.au/se… , a mark for your
logbook and a mark for your code. It will be limited to 20% more than the marks awarded by the
web submission system
(https://cs.adelaide.edu.au/se… .
See “Assessment – Mark Calculations
(pages/assessment-mark-calculations) ” for examples
of how the marks are combined. Your final submission mark, after the application of late penalties,
will be posted to the myuni gradebook when the assignment marking is complete.
NOTE – A logbook mark of 0 results in a Final Submission mark of 0.
Automa?c Marking
The final submission marks awarded by the web submission system
(https://cs.adelaide.edu.au/se… for each component program will be weighted
as follows:
For students enrolled in COMP SCI 2000 Computer Systems:
Assignment 3 – Final Submissions – UG
parser – 30%
codegen – 40%
pretty – 10%
lint – 20%
You can view the weighted marks in the UG Final assignment but submissions must be made
using the Assignment 3 – Submit Here assignment.
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For students enrolled in COMP SCI 7081 Computer Systems:
Assignment 3 – Final Submissions – PG
parser – 30%
codegen – 40%
pretty – 10%
optimiser-r – 20%
You can view the weighted marks in the PG Final assignment but submissions must be made
using the Assignment 3 – Submit Here assignment.
Logbook Marking
Important: the logbook must have entries for all work in this assignment, including your milestone
submissions and all of the component programs. All the logbook links in the web submission
system
(https://cs.adelaide.edu.au/se… assignments for Assignment 3
point to the same shared logbook. See “Assessment – Logbook Review
(pages/assessment-logbook-review) ” for details of how
your logbook will be assessed.
Code Review Marking
For each of your programming assignments you are expected to submit well written code. See
“Assessment – Code Review (pages/assessment-
code-review) ” for details of how your code will be assessed.
Assignment 3 – Par?cipa?on Marks
Any submissions to assignment 3 that are made more than one week before the due date for
Milestone Submissions may be awarded up to 10 participation marks. The participation marks will
be the weighted marks awarded for the Final Submissions divided by 10. You can view the
participation marks awarded in the One Week Pre Milestone assignment but submissions must
be made using the Assignment 3 – Submit Here assignment. The participation marks will be
allocated to week 10.
Any submissions to assignment 3 that are made no later than the due date for Milestone
Submissions may be awarded up to 10 participation marks. The participation marks will be the
weighted marks awarded for the Final Submissions divided by 10. You can view the participation
marks awarded in either the Pre Milestone assignment but submissions must be made using
the Assignment 3 – Submit Here assignment. The participation marks will be allocated to week
11.
A maximum of 20 participation marks are available.
Nand2Tetris Projects 10 & 11: Compiler I & II
Background
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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.
Objec?ve
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++. You should use the provided command diffc to
compare your program outputs to the example output files supplied by us. A set of precompiled
classes similar to those used in the workshops and the previous assignment are in the zip file
attached below. All the test files and test scripts necessary for this project are available in the zip
file attached below.
Tes?ng and IO
We have a provided a description of the requirements for each component program on its own
page. This includes instructions on how to compile, run and test each component program.
However before starting work on any of the component programs you should review the pages on
Testing and IO Controls.
Tes?ng
The test data including the convention used to name expected outputs for each test are described
on the Assignment 3 | testing (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
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functions have been provided and are described on the Assignment 3 | io controls
(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
(pages/assignment-3-%7C-parser)
(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
(pages/assignment-3-%7C-codegen) page.
pre?y
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 (pages/assignment-3-%7C-
pretty) page.
lint^
The lint program traverses an abstract syntax tree and generates a new abstract syntax tree that
has been annotated with warning and / or error messages. The specific requirements for this
component program are described on the Assignment 3 | lint
(pages/assignment-3-%7C-lint) page.
op?miser-r*
The optimiser-r program traverses an abstract syntax tree produced 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
(pages/assignment-3-%7C-optimiser-r) page.
Startup Files
The newest of the following zip file(s) must be placed in the updates sub-directory and added to
svn. When make is run, the newest zip file in the updates directory is used to update the startup
files. Any files you are required to edit will not be updated but, a copy of the latest version of those
files will be placed in the sub-directory originals.
