Java-- Compiler

Overview

This project implements a compiler for the Java-- programming language, a subset of Java with additional features. Developed for the Compilers course (L.EIC026) at the University of Porto.

Compiler Pipeline

The compiler processes Java-- source code through these stages:

1. Frontend

   • Lexical & syntactic analysis (ANTLR-based)
   • Semantic analysis with symbol table generation

2. Intermediate Representation

   • OLLIR code generation
   • Optimizations:
     • Constant propagation/folding
     • Configurable register allocation

3. Backend

   • Jasmin bytecode generation
   • JVM-specific optimizations

Key Features

Language Support

• Full Java-- grammar implementation
• Varargs method parameters
• Array operations and initializers [1,2,3]
• Control structures (if-else, while)
• Type checking and semantic validation

Optimization Flags

Option	Description
-o	Enable all optimizations
--r=N	Register allocation strategy: • N≥1: Max N registers • 0: Minimal registers • -1: No allocation (default)

Usage

java -jar compiler.jar [options] input.jmm