Two-Pass-Assembler

By Devesh Sangwan, Shikhar Panwar

This is a simple C++ implementation for a Two pass assembler.

Overview of the Code

pass1:

• Extracts all symbols and sections.
• A symbol and section table is generated and are stored in a csv file.

pass2:

• Each instruction is converted to machine code.
• The programs again reads the symbol table to get address and size associated with each symbol.

Other Functions:

• dec_to_bin(int) : Converts the given decimal number to the Binary String
• search_MOT(string) : It searchers the MOT for the Machine Operation Code and returns the index.
• search_symbol_table(string) : It searches the symbol_table and returns the address of the symbol.
• get_size(string) : It returns the size of the symbol/operation.
• get_data(string) : It extracts data from string and converts it into its binary equivalent.
• store_symbol_table() : Stores symbol table in csv format.
• store_sec() : Store section table in csv.

Structures:

• mnemonics : Machine Operation Table
• symbol : Symbol Table
• section: Section Table

Data Structures:

• Vector
• File Stream