This repository contains the code for SIC-XE Assembler which works on the SIC-XE assembly language instructions and outputs machine language code in binary. I have included support for program blocks in my assembler and it is written in C++ based on principles we learnt in the course CSN-252 (System Software).
SIC-XE stands for Simplified Instructional Computer Extended Version which is backward compatible with SIC. It was introduced in the book System Software by LL Beck for explaining major characteristics and traits of assembly languages through an exploratory assembly language. This assembler incorporates the key features of SIC-XE, including program blocks, and is implemented in a traditional two-pass manner:
- Pass 1: Parses the source code, processes variables, and generates the symbol table.
- Pass 2: Translates the parsed assembly instructions into machine code.
- Support for literals: Handles literal values efficiently.
- Symbol-defining statements: Processes symbol definitions and expressions.
- Program blocks: Allows modular code handling via program blocks.
- Error handling: Identifies and logs errors from both passes.
Assembly program in .asm file provided using SIC-XE standard set of instructions.
- Object Program file containing the header, text, modification and end records.
- Intermediate file containing useful information like addresses of each instruction and variable produced by pass 1 and used by pass 2.
- Listing File as output from pass 2 containing listing of instructions and corresponding object codes.
- Error file containing errors encountered during pass 1 and pass 2.
- Tables file containing all the necessary tables constructed during the passes of assemblers such as Symbol table and Literal table.
- A working C++ compiler such as g++.
- Input assembly code in a .asm file. I have briefly listed how to run the assembler on Windows and Linux/Ubuntu below. The complete instructions to run the assembler and the input and output explanation along with the methodolgy used can be found in this manual.
1. Run g++ Pass2.cpp
2. ./a.exe
3. Give input file name as input.
1. Run g++ Pass2.cpp
2. ./a.out
3. Give input file name as input.
Clone this repository:
git@github.com:Uviveknarayan/SIC-XE-Assembler.git
I would like to thank Prof. Manoj Misra for providing us this wonderful opportunity to learn about intricacies of an assembler. If you like/ find my work useful, please star this repository. If there are any queries, please raise issues on this repo, I will get back to you as soon as possible.
- System Software by Leland L Beck.
- CSN-252 System Software Course slides by Prof. Manoj Misra.