Finished Projects

Compiler

I wrote a LL(1) recursive decent parser in C++ that generates byte code for the Java Virtual Machine. The input language is C flavored, just not fully featured. My compiler effectively takes in a C file, and outputs an executable Java file.

The main benefit to this is I never have to write Java ever again!

Overview

A basic compiler has 3 major components:

• Lexical Analyzer - Takes in characters, outputs lexemes

• Parser - Evaluates the lexemes and constructs an abstract syntax tree

• Code Generator - Traverses the syntax tree and generates byte code

Most modern compilers are parser driven, meaning the parser will request for tokens while building the syntax tree.

Lexical Analyzer

This is the starting point of a compiler. It evaluates a buffer of characters, and uses regular expressions to produce lexemes (tokens) based on the keywords and identifiers. Below is the state diagram and subsequent logic for detecting a string.

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