asselinpaul/J-Assembly-Compiler

A simple J to LC4 Assembly compiler

Uses the same calling convention as lcc, enabling J programs to call subroutines compiled by lcc and vice versa.

Compile using clang 💥 with make jc

Running ./jc foo.j will produce foo.asm

Functionality Implemented:

• Decimal and Hex Literals
• Arithmetic Operations (+ - * / %)
• comparisons (lt, le, eq, ge, gt (<, <=, ==, >=, > respectively))
• logical operations (and, or, not)
• stack operations (drop, dup, swap, max)
• if statements (if, else, endif; supports nesting!)
• comments
• functions

; a function to compute the square of top of the stack value 

defun square

arg1 ; fetch input argument (n) from below FP, RA, and RV slots 

dup* ;(n*n)

return ; copy n*n into RV slot and return 

once defined, a function can be called as such:

4 square ; stack state after call: 4 16

⚠️ No error handling, expects a well-formed J program.