Through six phases, we designed a compiler for subset of Java called Mini-Java using Flex, Bison and JavaCC in C and Java. This included macro expansion, syntactic analysis, semantic analysis, IR generation and machine-level code generation.

For details refer: http://www.cse.iitm.ac.in/~krishna/cs3300/cs3310.html


Instructions for running: 

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1. Download jtb from:

http://www.cse.iitm.ac.in/~krishna/cs6848/software.html Or
http://compilers.cs.ucla.edu/jtb/

2. Install javacc

On Ubuntu
apt-get install javacc
On Fedora
yum install javacc

Or alternately you can download from http://javacc.java.net/ and just Set PATH like this:
export javacc=
export PATH=$javacc/bin:$PATH

3. mkdir SomeDir
Download minijava's grammar from Krishna Sir's web page
http://www.cse.iitm.ac.in/~krishna/cs3300/minijava.jj

4. Generate javacc's input grammar and the visitors and jtb.out.jj file using jtb

java -jar jtb132.jar minijava.jj

5. Generate the syntax tree using javacc

javacc jtb.out.jj

- TokenMgrError.java, ParseException.java, Token.java and JavaCharStream.java files will be created.(Boiler-plate files)
- MiniJavaParser.java, MiniJavaParserConstants.java and MiniJavaParserTokenManager.java files will be created.(custom files)

6. Download the Main.java program (from http://www.cse.iitm.ac.in/~krishna/cs3300/Main.java)

And sample minijava program (any program from http://www.cse.iitm.ac.in/~krishna/cs3300/minijava/)

7. Compile Main (javac Main.java) and execute it with any minijava program file as input