To install the TWS:

1. Edit pgen/Makefile.  All but one of lines 12-16 should be
   commented.  For Linux machines, uncomment line 12.   For CISE Sun
   machines, uncomment line 15.

2. While in 'tws' directory, simply type 'make'.

This Pascal-like compiler is a project for my Translators class. 

This project uses Tiny, which generates code for the abstract computer. This abstract computer is a stack machine with no addressable registers. The three distinct memories this machine uses are: Code memory, Data memory, and return memory. 

My project only involved adding functionality towards an already implemented, empty compiler. The only files that have been changed for this project are the parse.tiny, lex.tiny, Constrainer.c, and CodeGenerator.c files. 

Lex.tiny is responsible for lexical analysis and defines key words. 

parse.tiny defines the grammar for our pascal-like language. It creates an abstract syntax tree in a file named "_TREE"

Constrainer.c takes in the "_TREE" file, and adds constraining information. The primary role of Constrainer.c is to throw out contextual errors when attempting to compile a program. 

CodeGenerator.c takes in the constrained tree, and generates machine code for our abstract machine in a "_CODE" file.

The interpreter then simulates the execution of the "_CODE" file.

All testing files are located in tws/tiny/test-progs. Files marked pr*.c** tests to see if valid programs obtain the expected results. Files marked pr*.e** tests to see if invalid programs result in the expected compiling errors.