Assembler in C – Final Project

This project is a simplified assembler written in C, developed as part of the Systems Programming Lab course at the Open University of Israel. It reads assembly language files (.as), parses and validates the syntax, and generates machine code output files (.ob, .ent, .ext).

🛠 Features

• First and second pass parsing
• Symbol table creation
• Error handling and reporting
• Output file generation

📁 File Structure

All files are written in C (.c) and header files (.h):

• main.c – Entry point of the assembler
• first_pass.c / first_pass.h – Handles the first parsing pass
• second_pass.c / second_pass.h – Handles the second parsing pass
• symbol_table.c / symbol_table.h – Manages symbols and labels
• utils.c / utils.h – Helper functions and utilities
• output.c / output.h – Generates output files
• parser.c / parser.h – Parses assembly lines and instructions
• errors.c / errors.h – Error handling and reporting

🚀 How to Compile and Run

To compile the assembler:

gcc -Wall -o assembler *.c

To run the assembler on an input file:

./assembler example.as

Make sure to provide a valid .as file containing assembly code.

📂 Input and Output Examples

Example input files and sample outputs are available in the folders above.
These include .as files with runnable assembly code and the corresponding generated output files (.ob, .ent, .ext) for reference.

📚 Technologies

C (compiled with GCC)
Standard libraries only

🎓 Academic Context

This project was developed as part of the Systems Programming Lab course at the Open University of Israel. It demonstrates understanding of low-level programming, memory management, and multi-pass parsing techniques.

👤 Author

Ron Stern
Computer Science student at the Open University of Israel