Ty Newman

Featured Project: SIC XE Assembler

Course: Systems Programming

Description: Made an assembler that takes in SIC XE code, and creates a symbol table, which is then used to make a obj file for my final project last semester in which me and my group mate presented in front of the class

Key Features:

• PC Relative and Base Relative addressing
• Immediate/indirect addressing, program relocation using modification records
• Support for literals and symbols, and expressions

Annotated Source Code

// Add label to symbol table if present
if (label[0] != '\0') {
    if (!symbol_exists(label)) {
        add_symbol(label, locctr);
    } else {
        error("Duplicate symbol detected");
    }
}
        

disp = targetAddr - pc;

if (disp >= -2048 && disp <= 2047) {
    p_flag = 1;   // PC-relative
} else if (base_set) {
    disp = targetAddr - base_register;
    b_flag = 1;   // Base-relative
}
        

if (is_extended) {
    add_modification_record(locctr + 1, 5);
}