Another Simple Bytecode

A simple bytecode language I designed with an included assembler and virtual machine interpreter.

Features include:

• 10 32-bit free use registers (r0-r9)
• Ability to input/output characters and numbers to the console as well as print a string to the console
• Most standard operations
• Ability to access memory to store/load variables

Requirements:

• Requires python 2 for assembler
• Any C compiler for virtual machine

Compiling using GCC:

Command: gcc virtual_machine.c

Available opcodes:

• nop

• load constant (lc)

• load constant upper (lcu)

• load variable (lv)

• store variable (str)

• push to stack (push)

• pop from stack (pop)

• branch if not equal (bin)

• branch if less than (bil)

• branch if equal (bie)

• branch if greater (big)

• branch without condition (b)

• compare (cmp)

• syscall (sys)

• increment counter (inc)

• decrement counter (dec)

• copy register (copy)

• swap register (swap)

• add (add)

• subtract (sub)

• multiply (mult)

• divide (div)

• modulus (mod)

• or (or)

• and (and)

• xor (xor)

• not (not)

• left shift (ls)

• right shift (rs)

Available registers:

• r0-r9

• acc

• br (branch conditional is stored here, cmp has less than = -1, greater than = 1, equal to = 0)

• c (counter)

• ss (stack start)

• se (stack end)

Available syscalls:

• 0 - pop value and output it to console

• 1 - pop char and output it to console

• 2 - input value from console and push it

• 3 - input char from console and push it

• 4 - print string from stack