Comp 3041 --- Fall 1999

Compilers

Code Generator
Due: Thursday, December 16, 1999

• Starting Out
• Looking Through the Assembly Code
• Submitting

Starting Out

Copy the file

~msiff/public/btl.tar 

into your directory. If you type in the command

/usr/local/bin/tar xvf btl.tar

it will create a bunch of sub-directories:

• btl/examples (sample files to test out code generator)
• btl/src/frontend (files for all the parts we've already worked on -- lexer, parser, type-checker, etc...)
• btl/src/backend (all the files relevant tot this assignment, including the stub file (codegen.sml))
• btl/src/vm (the virtual machine)

All your work will be in the stub file (codegen.sml).

To test out the code generator (and you can do this right away, although it won't be correct for the parts you have to write code for), do a CM.make(); and then

D.cg "<name of file>";

This will spit out assembly code and leave you with a %prompt.

Looking Through the Assembly Code

To go through the code generated, there are several commands you can use at the %prompt:

• h (help)
• g (go -- runs program)
• s (steps through one line at a time)
• r (display registers)
• m (display memory)

Note: You should create, edit, continue to work on your file codegen.sml and need only submit that file.

Submitting

Make sure your program contains comments indicating that you are the author. Include your e-mail address in the comments. By including your name you are stating that this work is yours and yours alone.