estan / mjc

Compiler for the MiniJava language

MiniJava Compiler (mjc)

This is a compiler for a slightly modified version of the MiniJava language described in Appel's Modern Compiler Implementation in Java. It was created as part of the course DD2488 Compiler Construction at KTH. The compiler targets the JVM and supports the basic language described here, with the following extensions:

Code	Description
IWE	'if' statements with or without 'else'
NBD	nested blocks with new variable declarations
ABC	array bounds checks
CLE CGT CGE CEQ CNE	comparison operators
BDJ	logical OR connective

Documentation

• Project Report (PDF)
• JavaDoc Documentation

Building

The compiler requires Java 7 or 8 and uses the Apache Ant build system.

Type ant in the top-level directory. The default Ant target builds the compiler, runs the unit tests, and produces the compiler JAR file (mjc.jar). See ant -projecthelp for other available targets.

Running

The compiler is invoked using the mjc script in the top-level directory. The available command line options are:

usage: mjc <infile> [options]
 -S             only output Jasmin assembly code
 -p             print abstract syntax tree
 -g             print abstract syntax tree in GraphViz format
 -h             show help message

For example, type ./mjc foo.java to compile foo.java. The result is written into the current working directory as a set of Jasmin assembly code files (.j), one file for each class, along with corresponding .class files from running the Jasmin assembler.