Compiler Construction - finals project

Partial implementation of a front-end compiler written in C to generate LLVM machine code for a subset of the PASCAL programming language.

Authors: Alexander Krawczyk, Michael Sgoff

This build uses Flex 2.6.4-6 and Bison 3.0.4. Developed and tested on a machine running Ubuntu 18.04.1 and the gcc 7.4.0 compiler.

Project structure:

pascal.l - FLEX Tokenizer
pascal.y - BISON Parser (LALR(1) Parsing)
ast_structs.c - Data structures for the AST
symtab.c - Symbol & Symbol table data structure
semantic.c - Symbol table, type checking (semantic validation)
translate.c - Translation into LLVM IR
utility.h - Some utility functions

Using the program:

Build with make, clean up with make clean and execute by sourcing ./pascal "pascalprog.pas", specifying the path to the the source file to compile. The translated output is written to a file named pascal.ll.

TODOs:

• FOR loops
• Debug operator expression
• Test the use of vars
• Create some sample files for testing
• Fix file writer bug