Multi-Pass Assembler (ANSI-C | C90)

This project is a fully functional multi-pass assembler implemented in strict ANSI-C (C90), built as part of a system programming course.
It includes macro processing, symbol table management, two-pass parsing, memory handling, and generation of machine code output files.

Features

• Macro Processing: Pre-assembler that expands user-defined macros.
• Two-Pass Assembly:
  • First pass: Symbol table creation, instruction/data counting, error detection.
  • Second pass: Resolving addresses, encoding instructions, and writing machine code.
• Complete Output Generation:
  • .ob – machine code in base-4 format
  • .ent – entry labels
  • .ext – external label references
• Error Handling: Comprehensive syntax and semantic error detection.

Files Overview

• assembler.c – Main assembly flow
• first_pass.c / second_pass.c – Parsing and encoding logic
• code_image.c – Machine code image handling
• errors_handler.c – Error reporting system
• *.as – Example assembly input files

How to Run

Compile using a standard ANSI-C compiler such as gcc:

gcc -ansi -Wall -pedantic *.c -o assembler
./assembler input.as